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Sample records for modeling system ems

  1. Modeling to Optimize Hospital Evacuation Planning in EMS Systems.

    Science.gov (United States)

    Bish, Douglas R; Tarhini, Hussein; Amara, Roel; Zoraster, Richard; Bosson, Nichole; Gausche-Hill, Marianne

    2017-01-01

    To develop optimal hospital evacuation plans within a large urban EMS system using a novel evacuation planning model and a realistic hospital evacuation scenario, and to illustrate the ways in which a decision support model may be useful in evacuation planning. An optimization model was used to produce detailed evacuation plans given the number and type of patients in the evacuating hospital, resource levels (teams to move patients, vehicles, and beds at other hospitals), and evacuation rules. Optimal evacuation plans under various resource levels and rules were developed and high-level metrics were calculated, including evacuation duration and the utilization of resources. Using this model we were able to determine the limiting resources and demonstrate how strategically augmenting the resource levels can improve the performance of the evacuation plan. The model allowed the planner to test various evacuation conditions and resource levels to demonstrate the effect on performance of the evacuation plan. We present a hospital evacuation planning analysis for a hospital in a large urban EMS system using an optimization model. This model can be used by EMS administrators and medical directors to guide planning decisions and provide a better understanding of various resource allocation decisions and rules that govern a hospital evacuation.

  2. An EM Modeling for Rescue System Design of Buried People

    Directory of Open Access Journals (Sweden)

    A. De Leo

    2015-01-01

    Full Text Available The development of a rescue system for buried persons is a subject of growing importance in case of occurrence of natural disasters such as earthquake, landslides, or avalanches. In this paper a fully analytical model has been developed to get some fundamental a priori design characteristics. The proposed system is based on the detection of the victim movements due to its respiratory activity: in particular, when an electromagnetic (EM wave impinges on a human body, the analysis of the reflected wave parameters such as amplitude, frequency, phase, or delay time allows for the detection of the breathing frequency. The model is simple on purpose because the great uncertainty concerning the characterization of many environmental parameters of a general situation makes a very detailed model useless. However, it is accurate enough to provide useful information about system design, filling the gap in the literature concerning the electromagnetic formulation of such kinds of problems. A system prototype was built using laboratory equipment to experimentally validate the model, and subsequently breathing frequency measurements were carried on, both in a lossless laboratory environment and in a lossy realistic scenario.

  3. Accurate 2D/3D electromagnetic modeling for time-domain airborne EM systems

    Science.gov (United States)

    Yin, C.; Hodges, G.

    2012-12-01

    The existing industry software cannot deliver correct results for 3D time-domain airborne EM responses. In this paper, starting from the Fourier transform and convolution, we compare the stability of different modeling techniques and analyze the reason for instable calculations of the time-domain airborne EM responses. We find that the singularity of the impulse responses of EM systems at very early time that are used in the convolution is responsible for the instability of the modeling (Fig.1). Based on this finding, we put forward an algorithm that uses step response rather than impulse response of the airborne EM system for the convolution and create a stable algorithm that delivers precise results and maintains well the integral/derivative relationship between the magnetic field B and the magnetic induction dB/dt. A three-step transformation procedure for the modeling is proposed: 1) output the frequency-domain EM response data from the existing software; 2) transform into step-response by digital Fourier/Hankel transform; 3) convolve the step response with the transmitting current or its derivatives. The method has proved to be working very well (Fig. 2). The algorithm can be extended to the modeling of other time-domain ground and airborne EM system responses.Fig. 1: Comparison of impulse and step responses for an airborne EM system Fig. 2: Bz and dBz/dt calculated from step (middle panel) and impulse responses (lower panel) for the same 3D model as in Fig.1.

  4. International EMS Systems

    DEFF Research Database (Denmark)

    Langhelle, Audun; Lossius, Hans Morten; Silfvast, Tom;

    2004-01-01

    Emergency medicine service (EMS) systems in the five Nordic countries have more similarities than differences. One similarity is the involvement of anaesthesiologists as pre-hospital physicians and their strong participation for all critically ill and injured patients in-hospital. Discrepancies do...... exist, however, especially within the ground and air ambulance service, and the EMS systems face several challenges. Main problems and challenges emphasized by the authors are: (1) Denmark: the dispatch centres are presently not under medical control and are without a national criteria based system....... Access to on-line medical advice of a physician is not available; (2) Finland: the autonomy of the individual municipalities and their responsibility to cover for primary and specialised health care, as well as the EMS, and the lack of supporting or demanding legislation regarding the EMS; (3) Iceland...

  5. Theoretical and FEM analysis of suspension and propulsion system with HTS hybrid electromagnets in an EMS Maglev model

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Y.D., E-mail: ydchung@suwon.ac.kr [Department of Electrical Engineering, Suwon University, Bongdang Eup, Hwaseong Si 445-743 (Korea, Republic of); Lee, C.Y. [Korea Railroad Research Institute, Woram Dong, Uiwang Si 437-757 (Korea, Republic of); Jang, J.Y. [Department of Electrical Engineering, Ansan College of Technology, Choji-Dong, Ansan Si 425-792 (Korea, Republic of); Yoon, Y.S. [Department of Electrical and Electronic Engineering, Yonsei University, Sinchon-dong, Seoul 120-749 (Korea, Republic of); Ko, T.K. [Department of Electrical Engineering, Ansan College of Technology, Choji-Dong, Ansan Si 425-792 (Korea, Republic of)

    2011-11-15

    We examine levitation and propulsion forces of the proto-type maglev vehicle system based on 3D FEM. The levitation force increases over 15% due to AC current of the guideway. The levitation force by HTS electromagnet (EM) and AC current is larger over 30% than that of only HTS EM. We have been constructed a proto-type electromagnetic suspension (EMS) based maglev vehicle system. The maglev concept utilizes magnetic forces for noncontact suspension, guidance and propulsion. The suspension system with high temperature superconducting (HTS) hybrid electromagnet (EM) is composed of HTS coils and normal coils, which consume little power to keep large suspension gap. The magnetic forces realize to guide the vehicle, propel the vehicle along the guide-way and assist in braking action. The proto-type EMS-based Maglev model is designed to keep the suspension gap of 20 mm. This paper presents the theoretical analysis of the maglev vehicle based on the EMS model to obtain the designing parameters for levitation and propulsion forces. The magnetic field distributions of the electromagnetic forces with hybrid EM and propulsion stator coils are analyzed based on three dimension (3D) finite element method (FEM) analysis. From the simulation results, appropriately design parameters of the suspension, guidance and propulsion were obtained.

  6. International EMS Systems

    DEFF Research Database (Denmark)

    Langhelle, Audun; Lossius, Hans Morten; Silfvast, Tom

    2004-01-01

    exist, however, especially within the ground and air ambulance service, and the EMS systems face several challenges. Main problems and challenges emphasized by the authors are: (1) Denmark: the dispatch centres are presently not under medical control and are without a national criteria based system......Emergency medicine service (EMS) systems in the five Nordic countries have more similarities than differences. One similarity is the involvement of anaesthesiologists as pre-hospital physicians and their strong participation for all critically ill and injured patients in-hospital. Discrepancies do...

  7. Dynamic performance analysis model of high-reliability EMS-Maglev system

    Institute of Scientific and Technical Information of China (English)

    FANG You-tong; YAO Ying-ying

    2007-01-01

    In this paper, a modified transient finite element (FE) algorithm for the performance analysis of magnetically levitated vehicles of electromagnetic type is presented. The algorithm incorporates the external power system and vehicle's movement equations into FE model of transient magnetic field computation directly. Sliding interface between stationary and moving region is used during the transient analysis. The periodic boundaries are implemented in an easy way to reduce the computation scale. It is proved that this method can be used for both electro-motional static and dynamic cases. The test of a transformer and an EMS-Maglev system reveals that the method generates reasonable results at very low computational costs comparing with the transient FE analysis.

  8. The Effect of Ambulance Staffing Models in a Metropolitan, Fire-Based EMS System.

    Science.gov (United States)

    Cortez, Eric J; Panchal, Ashish R; Davis, James E; Keseg, David P

    2017-04-01

    Introduction The staffing of ambulances with different levels of Emergency Medical Service (EMS) providers is a difficult decision with evidence being mixed on the benefit of each model. Hypothesis/Problem The objective of this study was to describe a pilot program evaluating alternative staffing on two ambulances utilizing the paramedic-basic (PB) model (staffed with one paramedic and one emergency medical technician[EMT]). This was a retrospective study conducted from September 17, 2013 through December 31, 2013. The PB ambulances were compared to geographically matched ambulances staffed with paramedic-paramedic (PP ambulances). One PP and one PB ambulance were based at Station A; one PP and one PB ambulance were based at Station B. The primary outcome was total on-scene time. Secondary outcomes included time-to-electrocardiogram (EKG), time-to-intravenous (IV) line insertion, IV-line success rate, and percentage of protocol violations. Inclusion criteria were all patients requesting prehospital services that were attended to by these teams. Patients were excluded if they were not attended to by the study ambulance vehicles. Descriptive statistics were reported as medians and interquartile ranges (IQR). Proportions were reported with 95% confidence intervals (CI). The Mann-Whitley U test was used for significance testing (Pambulance were shorter than the PB ambulance team (PP: 10.1 minutes, IQR 6.0-15; PB: 13.0 minutes, IQR 8.1-18; P=.01). This finding also was noted at Station B (PP: 13.5 minutes, IQR 8.5-19; PB: 14.3 minutes, IQR 9.9-20; P=.01). There were no differences between PP and PB ambulance teams at Station A or Station B in time-to-EKG, time-to-IV insertion, IV success rate, and protocol violation rates. In the setting of a well-developed EMS system utilizing an all-Advanced Life Support (ALS) response, this study suggests that PB ambulance teams may function well when compared to PP ambulances. Though longer scene times were observed, differences in

  9. Complaints against an EMS system.

    Science.gov (United States)

    Colwell, Christopher B; Pons, Peter T; Pi, Randy

    2003-11-01

    Complaints against Emergency Medical Services (EMS) agencies represent a concerning and potentially time-consuming problem for all involved in the delivery of prehospital emergency medical care. The objective of this study was to identify the source of complaints against an EMS system to help focus quality and performance improvement and customer service efforts. We conducted a retrospective review of complaints filed against a busy urban EMS agency over a 6-year period. All complaints were included, totaled by season and by year, and categorized by originator and nature of the complaint. A total of 286 complaints were registered during the 6-year period, with an average of 48 per year and 9.3 per 10,000 responses. The most common originators of complaints were patients (53%) followed by medical personnel (19%) and family members or friends (12%). Rude behavior accounted for 23% of the complaints registered, followed by technical skills (20%), transport problems (18%), and loss of belongings (13%). The identification of areas of dissatisfaction will allow focused quality and performance improvement programs directed at customer service and risk management.

  10. EM threat analysis for wireless systems.

    Energy Technology Data Exchange (ETDEWEB)

    Burkholder, R. J. (Ohio State University Electroscience Laboratory); Mariano, Robert J.; Schniter, P. (Ohio State University Electroscience Laboratory); Gupta, I. J. (Ohio State University Electroscience Laboratory)

    2006-06-01

    Modern digital radio systems are complex and must be carefully designed, especially when expected to operate in harsh propagation environments. The ability to accurately predict the effects of propagation on wireless radio performance could lead to more efficient radio designs as well as the ability to perform vulnerability analyses before and after system deployment. In this report, the authors--experts in electromagnetic (EM) modeling and wireless communication theory--describe the construction of a simulation environment that is capable of quantifying the effects of wireless propagation on the performance of digital communication.

  11. Sistema de conhecimento para diagnóstico em acupuntura: uma modelagem usando o CommonKADS Knowledge system for acupuncture diagnosis: a modeling using commonKADS

    Directory of Open Access Journals (Sweden)

    Luiz Fernando Lopes

    2011-01-01

    Full Text Available A tomada de decisão em acupuntura é um processo complexo, uma vez que existe uma grande variedade de elementos e circunstâncias a serem considerados em um tratamento. Uma tarefa intensiva em conhecimento fundamental para o sucesso do tratamento é o diagnóstico. Assim, este artigo tem por objetivo apresentar uma proposta de sistema de conhecimento, utilizando a metodologia CommonKADS, com o objetivo de auxiliar na tarefa de diagnóstico em acupuntura, minimizando o grau de incerteza do tratamento e melhorando as condições de saúde e bem-estar do paciente. O modelo proposto é validado pela construção de um protótipo para diagnóstico de acne utilizando redes bayesianas.Decision making in acupuncture is a complex process, once there is a great variety of elements and circumstances to be considered during the treatment. The diagnosis, a knowledge-intensive task, is fundamental for the success of the treatment. Therefore, this study proposes a knowledge system based on the CommonKADS methodology aiming to support diagnosis tasks and to minimize the level of uncertainty in order to improve patient health conditions and welfare. The proposed model is validated through acne diagnosis prototype using Bayesian networks.

  12. Metodologia para o balanceamento de linhas de montagem multi-modelo em ambientes de customização em massa Method for balancing mixed model assembly lines in mass customized production systems

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    Melissa Petry Gerhardt

    2007-01-01

    Full Text Available A implementação da customização na produção requer flexibilidade no processo produtivo. Esta pode ser adquirida através da adoção de linhas de montagem capazes de alternar diferentes modelos de um mesmo produto: as linhas de montagem multi-modelo. Neste tipo de sistema produtivo, a distribuição de tarefas entre as estações de trabalho tende a ser mais complexa, e os algoritmos de balanceamento de linhas uni-modelo tornam-se inadequados. Este artigo apresenta uma metodologia para balanceamento em linhas de montagem multi-modelo, a partir de procedimentos disponíveis na literatura e de proposições originais. Também propõe uma classificação dos mais recentes algoritmos desenvolvidos para o balanceamento de linhas de montagem multi-modelo em relação às suas principais características. A metodologia proposta tem sua aplicação ilustrada através de um estudo de caso na indústria de eletrodomésticos.Product customization requires flexibility from production systems, which is attainable by adopting assembly line configurations able to alternate different models of a same product, i.e., mixed model assembly lines. In these production arrangements, the assignment of tasks for work centers grows in complexity and single model balancing algorithms tend to perform poorly. This article presents a method to balance mixed model assembly lines based on algorithms available in the literature and in original proposals. A classification of balancing algorithms for the mixed model case is also presented, along with their most relevant features. The proposed method is applied to a case study from the home appliances industry.

  13. Configuring systems from components: the EMS approach

    Energy Technology Data Exchange (ETDEWEB)

    Nogiec, J.M. [Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)]. E-mail: nogiec@fnal.gov; Desavouret, E. [Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States); Kotelnikov, S. [Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States); Trombly-Freytag, K. [Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States); Walbridge, D. [Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)

    2004-11-21

    EMS is an exercise in component technology. It offers rapid development of specialized data acquisition, visualization and analysis systems via assembly from vertical and horizontal components. The EMS architecture allows for agile development of systems and promotes reuse of software. The framework supports a visual builder that shows connections between components and lists component properties. The system offers both off-line setup of properties and run-time modifications. Multi-bus architecture allows for independent routing of data, controls, debugs, and exceptions. The architecture, configuration process, and control of applications through scripting are presented.

  14. Development of the electromagnetic tomography system. Sensitivity study of anomalous body by model studies; EM tomography system no kaihatsu. Model kaiseki ni yoru ijotai no kando chosa kekka

    Energy Technology Data Exchange (ETDEWEB)

    Kumekawa, Y.; Miura, Y.; Takasugi, S. [Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan); Arai, E. [Metal Mining Agency of Japan, Tokyo (Japan)

    1996-05-01

    An examination was made by a model analysis on sensitivity and the like against a resistive anomalous body, in connection with an electromagnetic tomography system with surface earthquake sources and underground receiver arrangements. A resistivity model was of a three-dimensional structure, and built with a 5 ohm{center_dot}m low resistivity anomalous body assembled in a 100 ohm{center_dot}m homogeneous medium. As a result of the examination, it was shown that the size limitation of an analyzable anomalous body was 50{times}50{times}20m at a frequency of 8 to 10kHz and that a system with high precision in a high frequency range was necessary. The examination of effects under a shallow anomalous body revealed, for example, that the fluctuation of a low frequency response was large compared with a deep anomalous body and that, where a second anomalous body existed under it, the effect also appeared with a surface earthquake source positioned in the opposite side from the anomalous body. The examination of effects under the three dimensional structure revealed, for example, that a remarkable change appeared in the data with the change in the inclined angle of the transmission line against the strike of the anomalous body. 4 refs., 7 figs.

  15. Development of the EM tomography system. Part 2. Sensitivity studies of anomalous body by model studies; EM tomography system no kaihatsu. 2. Model kaiseki ni yoru ijotai no kando chosa kekka

    Energy Technology Data Exchange (ETDEWEB)

    Kumekawa, Y.; Miura, Y.; Takasugi, S. [GERD Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan); Arai, E. [Metal Mining Agency of Japan, Tokyo (Japan)

    1997-05-27

    A model analysis was used to investigate sensitivity of a two-dimensional structure on a resistivity anomalous body by using an electromagnetic tomography system. The resistivity model handled a three-dimensional structure. The model was prepared as a pseudo two-dimensional model in which a low resistivity anomalous body with 1 ohm-m was incorporated that has a basic length of 1000 m in the Y-direction in a homogenous medium having 100 ohm-m. As a result of the analysis, the following matters were elucidated: if a low resistivity anomalous body is present in a shallow subsurface, its impact starts appearing from lower frequencies than when the anomalous body exists only at a greater depth; if a high resistivity anomalous body exists, the detection sensitivity is lower than for the low resistivity anomalous body, but the analysis would be possible by using the phase because the phase has made a greater change; the source TxZ shows a change from lower frequencies than for the source TxX, and the amount of change is greater, hence the detection sensitivity on an anomalous body may be said higher with the source TxZ; however, for the anomalous body in shallow subsurface, the source TxX is more effective since it is not subjected to a too great impact at a greater depth. 5 refs., 7 figs.

  16. Modelo hipercubo integrado a um algoritmo genético para análise de sistemas médicos emergenciais em rodovias The hypercube queuing model integrated to a genetic algorithm to analyze emergency medical systems on highways

    Directory of Open Access Journals (Sweden)

    Ana Paula Iannoni

    2006-04-01

    Full Text Available O modelo hipercubo, conhecido na literatura de problemas de localização de sistemas servidor para cliente, é um modelo baseado em teoria de filas espacialmente distribuídas e aproximações Markovianas. O modelo pode ser modificado para analisar os sistemas de atendimentos emergenciais (SAEs em rodovias, considerando as particularidades da política de despacho destes sistemas. Neste estudo, combinou-se o modelo hipercubo com um algoritmo genético para otimizar a configuração e operação de SAEs em rodovias. A abordagem é efetiva para apoiar decisões relacionadas ao planejamento e operação destes sistemas, por exemplo, em determinar o tamanho ideal para as áreas de cobertura de cada ambulância, de forma a minimizar o tempo médio de resposta aos usuários e o desbalanceamento das cargas de trabalho das ambulâncias. Os resultados computacionais desta abordagem foram analisados utilizando dados reais do sistema Anjos do Asfalto (rodovia Presidente Dutra.The hypercube model, well-known in the literature on problems of server-to-customer localization systems, is based on the spatially distributed queuing theory and Markovian analysis approximations. The model can be modified to analyze Emergency Medical Systems (EMSs on highways, considering the particularities of these systems' dispatching policies. In this study, we combine the hypercube model with a genetic algorithm to optimize the configuration and operation of EMSs on highways. This approach is effective to support planning and operation decisions, such as determining the ideal size of the area each ambulance should cover to minimize not only the average time of response to the user but also ambulance workload imbalances, as well as generating a Pareto efficient boundary between these measures. The computational results of this approach were analyzed using real data Anjos do Asfalto EMS (which covers the Presidente Dutra highway.

  17. Functionalized anatomical models for EM-neuron Interaction modeling

    Science.gov (United States)

    Neufeld, Esra; Cassará, Antonino Mario; Montanaro, Hazael; Kuster, Niels; Kainz, Wolfgang

    2016-06-01

    The understanding of interactions between electromagnetic (EM) fields and nerves are crucial in contexts ranging from therapeutic neurostimulation to low frequency EM exposure safety. To properly consider the impact of in vivo induced field inhomogeneity on non-linear neuronal dynamics, coupled EM-neuronal dynamics modeling is required. For that purpose, novel functionalized computable human phantoms have been developed. Their implementation and the systematic verification of the integrated anisotropic quasi-static EM solver and neuronal dynamics modeling functionality, based on the method of manufactured solutions and numerical reference data, is described. Electric and magnetic stimulation of the ulnar and sciatic nerve were modeled to help understanding a range of controversial issues related to the magnitude and optimal determination of strength-duration (SD) time constants. The results indicate the importance of considering the stimulation-specific inhomogeneous field distributions (especially at tissue interfaces), realistic models of non-linear neuronal dynamics, very short pulses, and suitable SD extrapolation models. These results and the functionalized computable phantom will influence and support the development of safe and effective neuroprosthetic devices and novel electroceuticals. Furthermore they will assist the evaluation of existing low frequency exposure standards for the entire population under all exposure conditions.

  18. Low Diversity Bacterial Community and the Trapping Activity of Metabolites from Cultivable Bacteria Species in the Female Reproductive System of the Oriental Fruit Fly, <em>Bactrocera dorsalisem> Hendel (Diptera: Tephritidae

    Directory of Open Access Journals (Sweden)

    Hongyu Zhang

    2012-05-01

    Full Text Available Our goal was to identify the bacteria inhabiting the reproductive system of the female oriental fruit fly, <em>Bactrocera dorsalisem> (Hendel, and evaluate the chemotaxis of <em>B>. <em>dorsalis> to the metabolites produced by the bacteria. Based on 16S rRNA-based polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE, 18 operational taxonomic units (OTUs were assigned to the five bacterial classes <em>Betaproteobacteria>, <em>Alphaproteobacteria>, <em>Gammaproteobacteria>, <em>Bacilli> and <em>Actinobacteria>. Nine OTUs were assigned to <em>Gammaproteobacteria>, which was the most highly represented class. <em>Enterobacteriaceae> constituted the dominant family, and within this family, three genera and five species were identified, including <em>Enterobacter sakazakiiem>, <em>Klebsiella> <em>oxytoca>, <em>Klebsiella> <em>pneumoniae,> Raoultellaem> <em>terrigena em>and <em>Enterobacter> <em>amnigenus>. In this set, the first two species were the dominant components, and the latter three species were the minor ones. Finally, we found that the metabolites produced by <em>R.> terrigenaem>, <em>K. oxytocaem> and <em>K.> pneumoniae em>were attractive to the <em>B.> dorsalisem> adults, and in field studies, <em>B.> dorsalisem> adults were most attracted to <em>K.> oxytocaem>. Collectively, our results suggest that the female reproductive system plays an important role in the transfer of enterobacteria from the gut to fruit. Our data may prompt the development of a female-targeted population control strategy for this fly.

  19. Efficacy of terbinafine and itraconazole on a experimental model of systemic sporotrichosis Eficiência de terbinafina e itraconazol em um modelo experimental de esporotricose sistêmica

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    Ana Raquel Mano Meinerz

    2008-12-01

    Full Text Available Itraconazole is currently considered the drug of choice to treat the diverse clinical presentation of sporotrichosis. On the other hand terbinafine by virtue of its excellent in vitro activity is under comparative evaluation for its therapeutic potential for a wide range of fungal infections. In this study, our aim was to determine the in vivo efficacy of terbinafine and itraconazole on a experimental model of systemic sporotrichosis. 120 rats Wistar received an injection of 2x10³ S. schenckii cells by via the lateral tail vein. After 3 days the animals were treated with terbinafine (250mg/kg and itraconazole (100 mg/kg and their respective diluents. In our model, terbinafine and itraconazole were effective in reducing the number of clinical lesions and positive organ cultures. There was statistical difference between the groups treated with the antifungals in relation to the control groups (pItraconazol é atualmente considerado a droga de escolha para o tratamento das diferentes formas clínicas da esporotricose. Por outro lado a terbinafina devido a sua excelente atividade in vitro está sendo avaliada quanto ao seu potencial terapêutico frente a diversas infecções fúngicas. O objetivo deste estudo foi determinar a eficácia in vivo da terbinafina e itraconazol em um modelo de esporotricose experimental sistêmica. 120 ratos Wistar receberam uma injeção de 2x10³ células de S. schenckii pela veia lateral da cauda. Após 3 dias os animais foram tratados com terbinafina (250mg/kg e itraconazol (100mg/kg e os seus respectivos diluentes. No modelo experimental estudado, a terbinafina e itraconazol se mostraram efetivos reduzindo o número de sintomas clínicos e retroisolamento positivo para o agente. Houve diferenças estatísticas entre os grupos tratados com os antifúngicos em relação aos grupos controle (p<0,05 nas alterações clínicas, achados anatomopatológicos e no retroisolamento do agente, sendo que os animais tratados

  20. Aplicação do modelo hipercubo para análise de um sistema médico-emergencial em rodovia An application of the hypercube model to analyze an emergency medical system on a highway

    Directory of Open Access Journals (Sweden)

    Fernando César Mendonça

    2000-04-01

    Full Text Available Em um sistema médico-emergencial, o nível de serviço é fundamental, pois a qualidade de atendimento poderá ser a diferença entre a vida e a morte do usuário. Além da qualidade do atendimento, um dos componentes mais importantes do nível de serviço é o tempo médio de resposta a uma chamada emergencial. Entretanto, adquirir equipamentos e/ou treinamentos para a equipe, para reduzir este tempo de resposta, incorre em custos e investimentos adicionais. Nesta situação, aparece um importante trade-off entre o nível de serviço e o investimento no sistema. Para auxiliar a análise deste trade-off, há um modelo conhecido da literatura chamado hipercubo, que é baseado em teoria de filas espacialmente distribuídas. Neste artigo, adaptamos e aplicamos o modelo hipercubo para analisar os Anjos do Asfalto, um sistema médico-emergencial localizado ao longo da Rodovia Presidente Dutra entre as cidades do Rio de Janeiro e São Paulo. Os resultados mostraram que o modelo hipercubo pode ser uma ferramenta efetiva de apoio às decisões estratégicas e operacionais em sistemas emergenciais em rodovias.In an emergency medical system, the quality of the service is fundamental since this might be the difference between life and death of the user. Beyond the attendance quality, one of the most important components of the service level is the mean response time to an emergency call. However, acquiring equipment and training for the team to reduce this time imply additional costs and investments. In this case, an important trade-off appears between the service level and the investment in the system. To analyze this trade-off, there is a well-known model named hypercube, which is based in spatially distributed queueing theory. In this paper, we adapt and apply the hypercube model to analyze the "Anjos do Asfalto", an emergency medical system on the highway Presidente Dutra between the cities of Rio de Janeiro and São Paulo, in Brazil. The results

  1. Probabilistic modeling of wind energy sources integrated in a conventional power system; Modelagem probabilistica de fontes eolicas de energia integradas em sistema de potencia convencional

    Energy Technology Data Exchange (ETDEWEB)

    Dalence, G.W.H.

    1990-06-15

    This work describes a model capable of including non-conventional energy sources into a stochastic energy production model for conventional power sources. A wind energy system is initially considered as statistically independent of the hourly demand. The correlation between two wind systems is then considered by means of a joint wind speed distribution. The joint wind system is thereafter submitted to the stochastic energy production model considering independence between demand and wind speed. Finally the correlation wind systems and the hourly demand is studied. (author). 29 figs, 31 tabs

  2. Application of the Chameleon Model to EM Field Momentum

    Science.gov (United States)

    Robertson, Glen A.

    2008-01-01

    The Chameleon scalar field model proposed by Khoury and Weltman presents an alternative mechanism for circumventing the constraints from local tests of gravity by mediating a fifth force for cosmological expansion, which could result in experimental signatures detectable through modest improvements of current laboratory set-ups in the vicinity of oscillating matter. In this paper, the oscillation of a dielectric by a crossed EM field is investigated in light of the Chameleon model. An EM excited Chameleon field-force equation is developed and compared to several EM experiments using the Barium Titanate based dielectric material.

  3. Ranking transmission projects in large scale systems using an AC power flow model; Priorizacao de obras em sistemas de grande porte usando um modelo AC da rede

    Energy Technology Data Exchange (ETDEWEB)

    Melo, A.C.G. [Centro de Pesquisas de Energia Eletrica (CEPEL), Rio de Janeiro, RJ (Brazil); Fontoura Filho, R.N. [ELETROBRAS, Rio de Janeiro, RJ (Brazil); Peres, L.A.P. Pecorelli [FURNAS, Rio de Janeiro, RJ (Brazil); Morozowski Filho, M. [Santa Catarina Univ., Florianopolis, SC (Brazil)

    1994-12-31

    Initially, this paper summarizes the approach developed by the Brazilian Planning Criteria Working Group (GTCP/ELETROBRAS) for identifying which subset of transmission investments should be postponed to meet a pre-stablished budget constraint with the least possible impact on system performance. Next, this paper presents the main features of the computational model PRIO, which allows the application of the ranking process to large scale power systems (2,000 buses and 3,000 circuits), with as many as 100 projects to be ranked. In this model, the adequacy analysis of each system state is carried out through an AC power flow coupled to a successive linear programming based remedial actions model. Case studies with the IEEE-RTS system and a configuration of the Brazilian Southeastern are presented and discussed. (author) 7 refs., 6 figs., 5 tabs.

  4. Resource Document: Coordination of Pediatric Emergency Care in EMS Systems.

    Science.gov (United States)

    Remick, Katherine; Gross, Toni; Adelgais, Kathleen; Shah, Manish I; Leonard, Julie C; Gausche-Hill, Marianne

    2017-01-01

    Citing numerous pediatric-specific deficiencies within Emergency Medical Services (EMS) systems, the Institute of Medicine (IOM) recommended that EMS systems appoint a pediatric emergency care coordinator (PECC) to provide oversight of EMS activities related to care of children, to promote the integration of pediatric elements into day-to-day services as well as local and/or regional disaster planning, and to promote pediatric education across all levels of EMS providers. A systematic review of the literature was undertaken to describe the evidence for pediatric coordination across the emergency care continuum. The search strategy was developed by the investigators in consultation with a medical librarian and conducted in OVID, Medline, PubMed, Embase, Web of Science, and CINAHL databases from January 1, 1983 to January 1, 2016. All research articles that measured a patient-related or system-related outcome associated with pediatric coordination in the setting of emergency care, trauma, or disaster were included. Opinion articles, commentaries, and letters to the editors were excluded. Three investigators independently screened citations in a hierarchical manner and abstracted data. Of 149 identified titles, nine were included in the systematic review. The nine articles included one interventional study, five surveys, and three consensus documents. All articles favored the presence of pediatric coordination. The interventional study demonstrated improved documentation, clinical management, and staff awareness of high priority pediatric areas. The current literature supports the identification of pediatric coordination to facilitate the optimal care of children within EMS systems. In order for EMS systems to provide high quality care to children, pediatric components must be integrated into all aspects of care including day-to-day operations, policies, protocols, available equipment and medications, quality improvement efforts, and disaster planning. This systematic

  5. Modelagem da polimerização simultânea de estireno em suspensão e emulsão Modeling styrene simultaneous suspension and emulsion polymerization systems

    Directory of Open Access Journals (Sweden)

    Marcelo K. Lenzi

    2004-06-01

    polymerizations, while emulsion polymerization constituents are added during the batch. The influence of the moment when emulsion feed is started on the course of the polymerization and the effects on the polymer properties are analyzed. A mathematical model is developed to describe the behavior of the system. Simulation data obtained with the proposed model are in good agreement with experimental conversion, average molecular weight and molecular weight distribution data. It was observed that the polymer particle morphology and the average molecular weight change very significantly with the emulsion feed time and that such changes can lead to bimodal molecular weight distributions. Core-shell polymer particles were obtained, with the core being formed by polymer particles from the suspension polymerization process and the shell formed by polymer particles from the emulsion one.

  6. Optimized sizing model for renewable energy systems in rural areas; Modelo de dimensionamento otimizado para sistemas energeticos renovaveis em ambiente rurais

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Carlos E.C. [UNIOESTE, Cascavel, PR (Brazil). Centro de Ciencias Exatas e Tecnologicas]. E-mail: cecn@correios.net.br; Zuern, Hans H. [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Engenharia Eletrica

    2005-05-15

    The purpose of this research was to develop a methodology for sizing integrated renewable energy systems, useful for rural areas, using simulation and optimization tools developed in MATLAB 6.0. The sizing model produces a system with minimum cost and high reliability level, based on the concept of loss of power supply probability (LPSP) for consecutive hours. An optimization model is presented and three different sizing scenarios are calculated and compared, showing flexibility in the elaboration of different project conceptions. The obtained results show a complete sizing of the energy conversion devices and a long-term cost evaluation. (author)

  7. Aplicação de um Modelo Reológico Não-Linear em Sistemas Poliméricos Dilatantes Application of Non-Linear Rheological Model to Shear-Tickening Polymeric Systems

    Directory of Open Access Journals (Sweden)

    Rômulo F. Navarro

    2002-01-01

    Full Text Available A dilatância é um comportamento reológico comum a vários sistemas poliméricos embora não ocorra em polímeros puros. Existem várias teorias aplicáveis à explicação desse fenômeno e alguns modelos matemáticos para o ajuste de dados experimentais de quatro de suas seis formas de ocorrência. Neste trabalho é dado enfoque à dilatância antecedida por um comportamento newtoniano e sucedida pelo comportamento pseudoplástico. Para ajustar dados constantes da literatura para sistemas desse tipo, é apresentado um modelo híbrido e não-linear. Para o teste do modelo foram utilizados dados existentes na literatura para solução de alfa,ômega poli(t-butilestireno em óleo mineral e suspensão de partículas do copolímero de estireno com acrilato de metila em solução aquosa de poli(ácido acrílico. O modelo proposto apresenta boa concordância com os dados experimentais.Shear-thickening (dilatant behavior is common in several polymeric systems, but not in pure polymers. There are many theories that can be used to describe shear-thickening and some mathematical models that fit experimental data of three of its six types: dilatant, newtonian-dilatant, newtonian-dilatant-pseudoplastic, viscoplastic-dilatant, pseudoplastic-dilatant and newtonian-pseudoplastic-newtonian-dilatant sequences. This work deals with the behavior of newtonian-dilatant-pseudoplastic sequence behavior and proposes a hybrid, non-linear and viscous model to fit the experimental data from systems that present such rheological behavior. The systems under investigation were: a solution of alpha,omega poly(t-butylstyrene in a mineral oil (3g/dl (sample 1 and b suspension of styrene -- methyl acrylate copolymer (S-co-MA particles (15% vol. in a poly(acrylic acid (PAA (1% wt and water solution (sample 2. The proposed model agrees with the experimental data analysed.

  8. Dynamic modeling in compressible flow systems for application in real time leak detection; Modelagem dinamica em redes de escoamento compressivel para aplicacoes a deteccao de vazamentos em tempo real

    Energy Technology Data Exchange (ETDEWEB)

    Pires Neto, Joaquim Pamponet [Universidade Federal, Rio de Janeiro, RJ (Brazil). Escola de Quimica. Lab. SDV - Dutos]. E-mail: joaquim@copene.com.br

    2002-06-01

    It is remarkable how there are hardly any computer tools that can build a transient behavioral analysis of process variables in a compressible flow, especially during starting and shutdown of plant. From this scenario, a modeling and dynamic simulation of compressible flow systems was built, and a computer method for detecting leaks in real time was presented. The phenomenon model is based on moment and continuity equations in transient basis. Unidimensional and isentropic natural gas flow was considered. The set of differential equations is solved through numerical integrations in time, using Runge-Kutta methods, after applying the finite elements method to spatial continuum. The suggested method for detection of leaks is based on the self-regressive stochastic parametric model. The procedure consist in generating process transient input and output data series, such as nodal pressures and flow rates in pipes, during the occurrence of the events programmed by the dynamic simulator and use them during training of IMO predictors in RX model structure, with constant update. The manifestation of a leak is detected by the instant deviation, statistically significant and beyond safety limits, between a group of predictions and the corresponding process measures. (author)

  9. Implementation of an environmental management system (EMS) at Sydney Electricity

    Energy Technology Data Exchange (ETDEWEB)

    Markus, T. [Sydney Electricity, Sydney, NSW (Australia)

    1995-12-31

    Implementation of an environmental management system (EMS) to a recognised standard and having it certified externally is a means of demonstrated to the community, to customers and to the regulatory agencies, a determination to care for the environment. This paper outlines the EMS developed by Sydney Electricity. The project to develop the EMS comprised two stages. The first consisted of the preparation of a Preparatory Environmental Review, and the second, the implementation stage. The general elements of the EMS and a description of the details of the implementation are included. The continuing suitability and effectiveness of the EMS will depend on the commitment from management, continuing public consultation, technical documentation preparation and dissemination, employee motivation, training and assessment, and regular management and audit reviews. The EMS is expected to enable the verification of performance against targets, assist auditing and corrective action, control all activities for minimum adverse effect and demonstrate due diligence to the regulatory agencies. It is also expected to facilitate compliance with legislation and with policy. 1 fig.

  10. Abastecimento de água e esgotamento sanitário: estudo comparado de modelos de gestão em Santa Catarina Water supply and sewerage system: comparative study of management models in Santa Catarina

    Directory of Open Access Journals (Sweden)

    José Roberto Paludo

    2013-03-01

    conclusión de que los modelos de gestión son decisiones importantes que afectan el resultado de las políticas aplicadas.This article is a comparative analysis of management water supply and sewerage system of municipalities of Indaial and Itapema (Santa Catarina. The context was described as a synthesis of the diagnosis on the water situation at the global and national regulatory frame work of water supply and sewerage system in Brazil and Santa Catarina. Among the features are compared: the historical, socioeconomic, environmental policies, and especially the political context and the results of two selected cases. The general data were based on information available in public documents, academic studies, official web pages, in order to standardize the parameters. The period compared accompanies the beginning of the discussion of the problem, ie, from 2003 until 2009. The experiences of two cities analyzed led to the conclusion that the models of management are important decisions that influence the outcome of policies.

  11. Modern power systems control centers:From EMS to AEMS

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Traditional energy management system (EMS) plays an indispensable role in control centers of electric power systems. However, it also has several shortcomings, including lack of real-time closed-loop control, unreliable functional modules, and difficult to exchange data. The electric hybrid control theory (EHCT) has been proposed as an innovative and effective means to overcome these shortcomings. This paper argues that the EHCT provides a theoretical foundation for the advanced energy management system (AEMS) that can achieve multi-objective, near-optimal, and closed-loop control of electric power grids. This paper also discusses the significance for control centers to evolve from the traditional EMS to the AEMS. Furthermore, this paper points out that the traditional EMS can be considered as an integral part of the AEMS and that the AEMS can be built upon the traditional EMS. Thus, the resources that are currently available can be fully utilized to achieve near-optimal and closed-loop control of power system operations.

  12. Modern power systems control centers: From EMS to AEMS

    Institute of Scientific and Technical Information of China (English)

    HE GuangYu; SUN YingYun; RUAN QianTu; WANG Wei; DONG ShuFeng

    2009-01-01

    Traditional energy management system (EMS) plays an indispensable role in control centers of electric power systems. However, it also has several shortcomings, including lack of real-time closed-loop control, unreliable functional modules, and difficult to exchange data. The electric hybrid control theory (EHCT) has been proposed as an innovative and effective means to overcome these shortcomings. This paper argues that the EHCT provides a theoretical foundation for the advanced energy manage-ment system (AEMS) that can achieve multi-objective, near-optimal, and closed-loop control of electric power grids. This paper also discusses the significance for control centers to evolve from the tradi-tional EMS to the AEMS. Furthermore, this paper points out that the traditional EMS can be considered as an integral part of the AEMS and that the AEMS can be built upon the traditional EMS. Thus, the re-sources that are currently available can be fully utilized to achieve near-optimal and closed-loop con-trol of power system operations.

  13. Proposição de um modelo baseado em Customer Lifetime Value para a análise de melhorias no sistema produtivo Proposition of a Customer Lifetime Value model to evaluate production system improvements

    Directory of Open Access Journals (Sweden)

    Luís Felipe Riehs Camargo

    2011-01-01

    Full Text Available Este artigo propõe um modelo para analisar melhorias no sistema produtivo à luz do valor do cliente para a empresa. Para isso, apresenta um modelo que agrega variáveis advindas do processo produtivo, do mercado consumidor e de métricas do marketing. Os três pilares de sustentação do modelo são os clientes, com suas necessidades e percepções em relação aos produtos e serviços; as características atribuídas pela produção; e as regras para análise do impacto da adoção de diferentes melhorias no sistema produtivo sobre o valor vitalício dos clientes atuais (CLV. Além disso, um modelo de escolha discreta (logit é proposto como o integrador entre a produção e o marketing. O método de pesquisa utilizado foi composto de quatro etapas: levantamento de referencial; construção do modelo conceitual; aplicação em um caso; análise e discussão. Como resultados, observa-se que, havendo disponibilidade de informações e tempo para sua condução, o modelo contribui para a identificação de melhorias que contemplem simultaneamente a visão de produção e a de sustentabilidade financeira.This paper aims to propose a model to investigate the effect of improvements on the productive system on the organization considering customer value. The model proposed combine variables representing the productive process, market, and marketing metrics. It consists of three fundamental elements: consumers and their needs and perceptions of products and services; characteristics of the productive system; and rules to analyze the impact of adoption of different improvements on the productive system. Customer lifetime value (CLV was measured and a discrete choice model (logit is proposed as an integrator between production and marketing perspectives. The research methodology consisted of four steps: referential research, conceptual modeling, application in a particular case, and results analysis. As a result, it is observed that upon availability

  14. FDTD modeling of EM field inside microwave cavities

    CERN Document Server

    Narayan, Shiv; Kanth, V Krushna

    2017-01-01

    This book deals with the EM analysis of closed microwave cavities based on a three-dimensional FDTD method. The EM analysis is carried out for (i) rectangular microwave ovens and (ii) hybrid-cylindrical microwave autoclaves at 2.45 GHz. The field distribution is first estimated inside domestic rectangular ovens in xy-, yz-, and zx-plane. Further, the RF leakage from the oven door is determined to study the effect of leakage radiation on wireless communication at 2.45 GHz. Furthermore, the EM analysis of the autoclave is carried out based on 3D FDTD using staircase approximation. In order to show the capability of autoclaves (excited with five source) for curing the aerospace components and materials, the field distribution inside autoclave cavity is studied in presence of aerospace samples. The FDTD based modelling of oven and autoclave are explained with the appropriate expressions and illustrations.

  15. Advanced Spacecraft EM Modelling Based on Geometric Simplification Process and Multi-Methods Simulation

    Science.gov (United States)

    Leman, Samuel; Hoeppe, Frederic

    2016-05-01

    This paper is about the first results of a new generation of ElectroMagnetic (EM) methodology applied to spacecraft systems modelling in the low frequency range (system's dimensions are of the same order of magnitude as the wavelength).This innovative approach aims at implementing appropriate simplifications of the real system based on the identification of the dominant electrical and geometrical parameters driving the global EM behaviour. One rigorous but expensive simulation is performed to quantify the error generated by the use of simpler multi-models. If both the speed up of the simulation time and the quality of the EM response are satisfied, uncertainty simulation could be performed based on the simple models library implementing in a flexible and robust Kron's network formalism.This methodology is expected to open up new perspectives concerning fast parametric analysis, and deep understanding of systems behaviour. It will ensure the identification of main radiated and conducted coupling paths and the sensitive EM parameters in order to optimize the protections and to control the disturbance sources in spacecraft design phases.

  16. Permeability evaluation of reservoir rocks modeled in multi scale percolation systems; Determinacao da permeabilidade de rochas reservatorio reconstruidas em sistemas de percolacao multiescala

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Celso P.; Philippi, Paulo C.; Damiani, Marcos C.; Cunha Neto, Jose A.B. da [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Engenharia Mecanica. Lab. de Meios Porosos e Propriedades Termofisicas]. E-mail: celso@lmpt.ufsc.br; philippi@lmpt.ufsc.br; damiani@lmpt.ufsc.br; bellini@lmpt.ufsc.br; Daian, Jean-Francois (Laboratoire d' Etudes des Transferts en Hydrologie et Environement)

    2000-07-01

    Multiscale percolation systems (MPS) are presented as giving a fast method for calculating intrinsic permeability of porous media. MPS were proposed to study invasion processes in porous media considering the porous section as a polydisperse structure, which modify its geometrical structure when the scale of observation is changed. Multiscale models are non-regular percolation systems and do not have the following limitations common to classical percolation systems: it is not necessary to choose a particular value for the coordination number; constrictions appears naturally as pores of smaller diameters connecting pores of greater diameters, as the result of superposing different scales (Fernandes, C. P., Magnani, F.S., Philippi, P.C., Daian, J.F. 1996, Multiscale reconstruction of the porous structure, Physical Review E, 54, 1734-1742). Present paper describes the numerical prediction of intrinsic permeability of petroleum reservoir rocks by using a MPS approach. Rock's microstructure is reconstructed in a three dimensional MPS, starting from 2D thin sections geometrical information, after binarization and microstructural analysis. Intrinsic permeability is, then, calculated, using a procedure based on renormalization theory. The method is presented and applied for the calculation of intrinsic permeability of several petroleum reservoir rocks. Results are compared with experimental data. (author)

  17. Methodology and basic algorithms of the Livermore Economic Modeling System

    Energy Technology Data Exchange (ETDEWEB)

    Bell, R.B.

    1981-03-17

    The methodology and the basic pricing algorithms used in the Livermore Economic Modeling System (EMS) are described. The report explains the derivations of the EMS equations in detail; however, it could also serve as a general introduction to the modeling system. A brief but comprehensive explanation of what EMS is and does, and how it does it is presented. The second part examines the basic pricing algorithms currently implemented in EMS. Each algorithm's function is analyzed and a detailed derivation of the actual mathematical expressions used to implement the algorithm is presented. EMS is an evolving modeling system; improvements in existing algorithms are constantly under development and new submodels are being introduced. A snapshot of the standard version of EMS is provided and areas currently under study and development are considered briefly.

  18. A modified EM algorithm for estimation in generalized mixed models.

    Science.gov (United States)

    Steele, B M

    1996-12-01

    Application of the EM algorithm for estimation in the generalized mixed model has been largely unsuccessful because the E-step cannot be determined in most instances. The E-step computes the conditional expectation of the complete data log-likelihood and when the random effect distribution is normal, this expectation remains an intractable integral. The problem can be approached by numerical or analytic approximations; however, the computational burden imposed by numerical integration methods and the absence of an accurate analytic approximation have limited the use of the EM algorithm. In this paper, Laplace's method is adapted for analytic approximation within the E-step. The proposed algorithm is computationally straightforward and retains much of the conceptual simplicity of the conventional EM algorithm, although the usual convergence properties are not guaranteed. The proposed algorithm accommodates multiple random factors and random effect distributions besides the normal, e.g., the log-gamma distribution. Parameter estimates obtained for several data sets and through simulation show that this modified EM algorithm compares favorably with other generalized mixed model methods.

  19. Model Systems

    Directory of Open Access Journals (Sweden)

    Francisco Rodríguez-Trelles

    1998-12-01

    Full Text Available Current efforts to study the biological effects of global change have focused on ecological responses, particularly shifts in species ranges. Mostly ignored are microevolutionary changes. Genetic changes may be at least as important as ecological ones in determining species' responses. In addition, such changes may be a sensitive indicator of global changes that will provide different information than that provided by range shifts. We discuss potential candidate systems to use in such monitoring programs. Studies of Drosophila subobscura suggest that its chromosomal inversion polymorphisms are responding to global warming. Drosophila inversion polymorphisms can be useful indicators of the effects of climate change on populations and ecosystems. Other species also hold the potential to become important indicators of global change. Such studies might significantly influence ecosystem conservation policies and research priorities.

  20. The JAC airborne EM system: AEM-05

    Science.gov (United States)

    Leväniemi, H.; Beamish, D.; Hautaniemi, H.; Kurimo, M.; Suppala, I.; Vironmäki, J.; Cuss, R. J.; Lahti, M.; Tartaras, E.

    2009-03-01

    This paper describes the airborne electromagnetic (AEM) system operated by the Joint Airborne geoscience Capability (JAC), a partnership between the Finnish and British Geological Surveys. The system is a component of a 3-in-1, fixed-wing facility acquiring magnetic gradiometer and full spectrum radiometric data alongside the wing-tip, frequency-domain AEM measurements. The AEM system has recently (2005) been upgraded from 2 to 4 frequencies and now provides a bandwidth from 900 Hz to 25 kHz. The fixed-wing configuration of 4 dual vertical coplanar coils, offers a high signal/noise by virtue of the wingspan separation of the sensors. This unique configuration allows 3-in-1 surveys to be successfully performed at a variety of survey elevations when regulatory conditions are imposed. Its deployment on a twin-engine aircraft also permits low altitude surveying in countries, such as the UK, where this is a requirement. The development of the new AEM-05 system has been incremental and its history can be traced back over five decades. The AEM data acquired in the Finnish National Mapping project, and across northern Europe, have been used extensively in mineral exploration. More recent projects have investigated the application of the data to environmental, hydrogeological and land quality issues. These studies have been enhanced by reducing the flight line separation from 200 m (the national high-resolution scale) to 50 m. Our surveys also increasingly involve the application of AEM across populated areas often with extensive infrastructure. Additional secondary instrumentation has been introduced to provide an increased understanding of the data and the AEM responses observed. The secondary systems include an accurate, high sampling rate laser altimeter, a downward-looking digital camera to record the flight path, a 50/60 Hz power line monitor and a GPS gyroscope. The paper is intended as an overview and provides descriptions of the new AEM system, the secondary

  1. Flavour compound production by <em>Yarrowia lipolyticaem>,> Saccharomyces cerevisiae em>and <em>Debaryomyces hansenii em>in a cheese-surface model

    DEFF Research Database (Denmark)

    Sørensen, Louise Marie; Gori, Klaus; Petersen, Mikael Agerlin

    2011-01-01

    produced sulphides, furanes and short-chain ketones; Saccharomyces cerevisiae D7 primarily produced esters and Debaryomyces hansenii D18335 primarily produced branched-chain aldehydes and alcohols. For several of the detected flavour compounds, an increase in production was observed upon exposure to dairy......A simple cheese model mimicking a cheese surface was developed for the detection of cheese flavour formation of yeasts. A total of 56 flavour compounds were detected by dynamic headspace sampling followed by gas chromatography - mass spectrometry analysis. Yarrowia lipolytica CBS2075 primarily...

  2. 3D time-domain airborne EM modeling for an arbitrarily anisotropic earth

    Science.gov (United States)

    Yin, Changchun; Qi, Yanfu; Liu, Yunhe

    2016-08-01

    Time-domain airborne EM data is currently interpreted based on an isotropic model. Sometimes, it can be problematic when working in the region with distinct dipping stratifications. In this paper, we simulate the 3D time-domain airborne EM responses over an arbitrarily anisotropic earth with topography by edge-based finite-element method. Tetrahedral meshes are used to describe the abnormal bodies with complicated shapes. We further adopt the Backward Euler scheme to discretize the time-domain diffusion equation for electric field, obtaining an unconditionally stable linear equations system. We verify the accuracy of our 3D algorithm by comparing with 1D solutions for an anisotropic half-space. Then, we switch attentions to effects of anisotropic media on the strengths and the diffusion patterns of time-domain airborne EM responses. For numerical experiments, we adopt three typical anisotropic models: 1) an anisotropic anomalous body embedded in an isotropic half-space; 2) an isotropic anomalous body embedded in an anisotropic half-space; 3) an anisotropic half-space with topography. The modeling results show that the electric anisotropy of the subsurface media has big effects on both the strengths and the distribution patterns of time-domain airborne EM responses; this effect needs to be taken into account when interpreting ATEM data in areas with distinct anisotropy.

  3. EM modeling of RF drive in DTL tank 4

    Energy Technology Data Exchange (ETDEWEB)

    Kurennoy, Sergey S. [Los Alamos National Laboratory

    2012-06-19

    A 3-D MicroWave Studio model for the RF drive in the LANSCE DTL tank 4 has been built. Both eigensolver and time-domain modeling are used to evaluate maximal fields in the drive module and RF coupling. The LANSCE DTL tank 4 has recently been experiencing RF problems, which may or may not be related to its replaced RF coupler. This situation stimulated a request by Dan Rees to provide EM modeling of the RF drive in the DTL tank 4 (T4). Jim O'Hara provided a CAD model that was imported into the CST Microwave Studio (MWS) and after some modifications became a part of a simplified MWS model of the T4 RF drive. This technical note describes the model and presents simulation results.

  4. Modeling of <em>Mycobacterium aviumem> subsp. <em>paratuberculosis> in farm bulk tank milk

    DEFF Research Database (Denmark)

    Okura, Hisako; Nielsen, Søren Saxmose; Toft, Nils

    2012-01-01

    Mycobacterium avium subsp. paratuberculosis (MAP) in milk of bovine origin is suspected of being implicated Crohn’s disease in humans. Pasteurization is considered to reduce the concentration of MAP by at least 4 to 5 log10. This study aimed at estimating the level of MAP in milk at farm level...... super-shedders. At the prevalence of 15%, discarding milk from test positive cows would result in discarding 11% of milk and reduce the MAP level by 80%. The model was relatively simple yet capable of capturing true infection status and associated contributions from milk and feces. Further knowledge...

  5. Portable suction unit failure in a rural EMS system.

    Science.gov (United States)

    Risavi, Brian L; Sabotchick, K J; Heile, Christopher J

    2013-08-01

    Portable suction units used by EMS personnel are utilized infrequently and often are powered by batteries. Lack of use and inspection often results in failure of the device when it is needed. The purpose of this study was to examine the incidence of portable suction unit failure in a rural EMS system and to identify the reasons for failures. A convenience sample was obtained through both random inspections by the staff of a regional EMS council and data from twice monthly checks reported by respective EMS agencies following a standard protocol for each unit. A standard protocol was used, including checking the vacuum level on each suction unit and inspecting the tubing, canister, and battery. Each inspector assessed whether the unit was capable of achieving 300 mmHg of suction within four seconds. Also, the unit was inspected for any signs of misalignment or dry rot of the gasket, kinking of suction hose, damage to the suction canister, weak/dead battery, or defective pump. Findings were recorded. Over a two-year period, 9,631 suction unit inspections were completed. There were 233 failures (2.4%) noted. The majority (126, 54.1%) were due to battery failure. Seventy-three units failed due to other reasons (not recorded, switch failure, battery not seated). Ten inspections failed due to incorrect assembly. Nineteen inspections failed due to defects with the suction canister. Five inspections failed due to kinked/disconnected suction tubing. Only a relatively small percentage of inspections of suction units revealed failures (4.6% Advanced Life Support, 8.6% Basic Life Support) using the above-stated criteria. However, given the importance of airway management and potential complications associated with airway compromise, including aspiration pneumonia, hypoxia, and hemodynamic instability, this is of concern relative to the morbidity and mortality that could be related to airway failure. Due to the relative infrequency of use and the nature of portable suction units

  6. Chick Chorioallantoic Membrane (CAM Assay as an <em>In Vivem>>o em>Model to Study the Effect of Newly Identified Molecules on Ovarian Cancer Invasion and Metastasis

    Directory of Open Access Journals (Sweden)

    Carmela Ricciardelli

    2012-08-01

    Full Text Available The majority of ovarian cancer patients present with advanced disease and despite aggressive treatment, prognosis remains poor. Significant improvement in ovarian cancer survival will require the development of more effective molecularly targeted therapeutics. Commonly, mouse models are used for the <em>in vivo em>assessment of potential new therapeutic targets in ovarian cancer. However, animal models are costly and time consuming. Other models, such as the chick embryo chorioallantoic membrane (CAM assay, are therefore an attractive alternative. CAM assays have been widely used to study angiogenesis and tumor invasion of colorectal, prostate and brain cancers. However, there have been limited studies that have used CAM assays to assess ovarian cancer invasion and metastasis. We have therefore developed a CAM assay protocol to monitor the metastatic properties of ovarian cancer cells (OVCAR-3, SKOV-3 and OV-90 and to study the effect of potential therapeutic molecules <em>in vivoem>. The results from the CAM assay are consistent with cancer cell motility and invasion observed in <em>in vitro em>assays. Our results demonstrate that the CAM assay is a robust and cost effective model to study ovarian cancer cell metastasis. It is therefore a very useful <em>in vivoem> model for screening of potential novel therapeutics.

  7. Maximum Likelihood in a Generalized Linear Finite Mixture Model by Using the EM Algorithm

    NARCIS (Netherlands)

    Jansen, R.C.

    A generalized linear finite mixture model and an EM algorithm to fit the model to data are described. By this approach the finite mixture model is embedded within the general framework of generalized linear models (GLMs). Implementation of the proposed EM algorithm can be readily done in statistical

  8. Continuous system modeling

    Science.gov (United States)

    Cellier, Francois E.

    1991-01-01

    A comprehensive and systematic introduction is presented for the concepts associated with 'modeling', involving the transition from a physical system down to an abstract description of that system in the form of a set of differential and/or difference equations, and basing its treatment of modeling on the mathematics of dynamical systems. Attention is given to the principles of passive electrical circuit modeling, planar mechanical systems modeling, hierarchical modular modeling of continuous systems, and bond-graph modeling. Also discussed are modeling in equilibrium thermodynamics, population dynamics, and system dynamics, inductive reasoning, artificial neural networks, and automated model synthesis.

  9. Effect of Calcium and Potassium on Antioxidant System of <em>Vicia fabaem> L. Under Cadmium Stress

    Directory of Open Access Journals (Sweden)

    Hayssam M. Ali

    2012-05-01

    Full Text Available Cadmium (Cd in soil poses a major threat to plant growth and productivity. In the present experiment, we studied the effect of calcium (Ca2+ and/or potassium (K+ on the antioxidant system, accumulation of proline (Pro, malondialdehyde (MDA, and content of photosynthetic pigments, cadmium (Cd and nutrients, <em>i.e.>, Ca2+ and K+ in leaf of <em>Vicia faba em>L. (cv. TARA under Cd stress. Plants grown in the presence of Cd exhibited reduced growth traits [root length (RL plant−1, shoot length (SL plant−1, root fresh weight (RFW plant−1, shoot fresh weight (SFW plant−1, root dry weight (RDW plant−1 and shoot dry weight (SDW plant−1] and concentration of Ca2+, K+, Chlorophyll (Chl <em>a> and Chl <em>b em>content, except content of MDA, Cd and (Pro. The antioxidant enzymes [peroxidase (POD and superoxide dismutase (SOD] slightly increased as compared to control under Cd stress. However, a significant improvement was observed in all growth traits and content of Ca2+, K+, Chl <em>a>, Chl <em>b em>,Pro and activity of antioxidant enzymes catalase (CAT, POD and SOD in plants subjected to Ca2+ and/or K+. The maximum alleviating effect was recorded in the plants grown in medium containing Ca2+ and K+ together. This study indicates that the application of Ca2+ and/or K+ had a significant and synergistic effect on plant growth. Also, application of Ca2+ and/or K+ was highly effective against the toxicity of Cd by improving activity of antioxidant enzymes and solute that led to the enhanced plant growth of faba bean plants.

  10. Nephrus: expert system model in intelligent multilayers for evaluation of urinary system based on scintigraphic image analysis; Nephrus: modelo de sistema especialista em multicamadas inteligentes para avaliacao do sistema urinario baseado na analise de imagens cintilograficas

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jorge Wagner Esteves da; Schirru, Roberto [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear; Boasquevisque, Edson Mendes [Hospital dos Servidores do Estado, Rio de Janeiro, RJ (Brazil). Servico de Medicina Nuclear

    1999-11-01

    Renal function can be measured noninvasively with radionuclides in a extremely safe way compared to other diagnosis techniques. Nevertheless, due to the fact that radioactive materials are used in this procedure, it is necessary to maximize its benefits, therefore all efforts are justifiable in the development of data analysis support tools for this diagnosis modality. The objective of this work is to develop a prototype for a system model based on Artificial Intelligence devices able to perform functions related to cintilographic image analysis of the urinary system. Rules used by medical experts in the analysis of images obtained with {sup 99m} Tc+DTPA and /or {sup 99m} Tc+DMSA were modeled and a Neural Network diagnosis technique was implemented. Special attention was given for designing programs user-interface. Human Factor Engineering techniques were taking in account allowing friendliness and robustness. The image segmentation adopts a model based on Ideal ROIs, which represent the normal anatomic concept for urinary system organs. Results obtained using Artificial Neural Networks for qualitative image analysis and knowledge model constructed show the feasibility of Artificial Neural Networks for qualitative image analysis and knowledge model constructed show feasibility of Artificial Intelligence implementation that uses inherent abilities of each technique in the medical diagnosis image analysis. (author) 12 refs., 4 figs., 2 tabs.

  11. NEPHRUS: model of intelligent multilayers expert system for evaluation of the renal system based on scintigraphic images analysis; NEPRUS: modelo de sistema especialista em multicamadas inteligentes para avaliacao do sistema urinario baseado na analise de imagens cintilograficas

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jose W.E. da; Schirru, Roberto [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia; Boasquevisque, Edson M. [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Servico de Medicina Nuclear

    1997-10-01

    This work develops a prototype for the system model based on Artificial Intelligence devices able to perform functions related to scintigraphic image analysis of the urinary system. Criteria used by medical experts for analysis images obtained with {sup 99m} Tc+DTPA and/or {sup 99m} Tc+DMSA were modeled and a multi resolution diagnosis technique was implemented. Special attention was given to the programs user interface design. Human Factor Engineering techniques were considered so as to ally friendliness and robustness. Results obtained using Artificial Neural Networks for the qualitative image analysis and the knowledge model constructed shows the feasibility of Artificial Intelligence implementation that use `inherent` abilities of each technique in the resolution of diagnosis image analysis problems. (author). 12 refs., 2 figs., 2 tabs.

  12. Description, field test and data analysis of a controlled-source EM system (EM-60). [Leach Hot Springs, Grass Valley

    Energy Technology Data Exchange (ETDEWEB)

    Morrison, H.F.; Goldstein, N.E.; Hoversten, M.; Oppliger, G.; Riveros, C.

    1978-10-01

    The three sections describe the transmitter, the receiver, and data interpretations and indicate the advances made toward the development of a large moment electromagnetic (EM) system employing a magnetic dipole source. A brief description is given of the EM-60 transmitter, its general design, and the consideration involved in the selection of a practical coil size and weight for routine field operations. A programmable, multichannel, multi-frequency, phase-sensitive receiver is described. A field test of the EM-60, the data analysis and interpretation procedures, and a comparison between the survey results and the results obtained using other electrical techniques are presented. The Leach Hot Springs area in Grass Valley, Pershing County, Nevada, was chosen for the first field site at which the entire system would be tested. The field tests showed the system capable of obtaining well-defined sounding curves (amplitude and phase of magnetic fields) from 1 kHz down to 0.1 Hz. (MHR)

  13. Modelagem e análise de um sistema de controle automático da altura de corte em colhedoras Modeling and analysis of an automatic control system for harvesting machine cutting height

    Directory of Open Access Journals (Sweden)

    Leidy Z. L. Rafull

    2006-09-01

    Full Text Available Neste estudo, desenvolveu-se um modelo de simulação para analisar a dinâmica de um sistema a fim de controlar automaticamente a altura de corte em colhedoras. Este modelo foi implementado com base nas equações diferenciais, que descrevem a dinâmica da plataforma de corte, o comportamento do sistema hidráulico e o controlador. O sistema de controle realimentado simulado foi constituído de uma célula de carga, destinada a medir a força de contato entre o solo e o mecanismo de corte, um controlador PID e um sistema hidráulico de atuação, composto de uma válvula proporcional direcional de quatro vias e um atuador. Analisou-se a influência da velocidade de deslocamento da máquina (1,0, 1,5 e 2,0 m s-1, da pressão de suprimento do sistema hidráulico (6,8, 13,7 e 20,6 MPa, da massa da plataforma (40, 60 e 80 kg e da força de contato de referência do controlador (200, 400 e 800 N no desempenho do sistema de controle. Os aumentos na pressão de suprimento, massa da plataforma e força de referência, proporcionaram melhores condições para o funcionamento do sistema de controle proposto.A simulation model to analyze the dynamics of a system to control automatically the cutting height in harvesters was developed. The model was developed using the differential equations that describe the dynamics of the cuttig platform, the behavior of the hydraulic system and the controller. The simulated feedback control system was composed by a load cell that measures the contact force between the soil and the cutting device, a feedback controller (PID and a hydraulic system with proportional directional four-way valve and actuator. The effect of the following variables in the controller performance was analyzed: speed of the cutting device (1.0, 1.5 and 2.0 m s-1; pressure in the supply line of the hydraulic system (6.8, 13.7 and 20.6 MPa; ballast added in the cutting mechanism (40, 60 and 80 kg and the contact force between the cutting device and

  14. Um sistema de ventrículo pulmonar produzindo pressão pulsátil em único ventrículo: modelo experimental A pulmonary ventricle system producing pulsatile pressure in single ventricle: experimental model

    Directory of Open Access Journals (Sweden)

    Bilgein Emrecan

    2006-09-01

    Full Text Available OBJETIVO: Pacientes com ventrículo único funcional têm prognóstico ruim, que resulta em insuficiência cardíaca, mesmo após tratamento cirúrgico. As operações derivação cavo-pulmonar (exceto pelas conexões do átrio direito ao ventrículo direito não apresentam sistema ventricular pulmonar com pressão pulsátil, além do fluxo reduzido ao ventrículo único. Para resolver o problema, tentamos criar um ventrículo pulmonar que produza pressão pulsátil experimentalmente. MÉTODO: Tentamos criar um sistema ventricular direito que produzisse pressão pulsátil. O modelo experimental foi realizado em seis ovelhas. As pressões do ventrículo pulmonar criado, da artéria pulmonar e do ventrículo esquerdo foram medidas após a saída da circulação extracorpórea. RESULTADOS: A média das pressões arteriais pulmonares sistólica e diastólica foi 15,6 ± 2,0 mmHg e 4,5 ± 1,5 mmHg. A média da pressão sistólica ventricular esquerda foi 76,6 ± 4,4 mmHg. CONCLUSÃO: Um ventrículo que produza pressão pulsátil é necessário para a regulação do fluxo da artéria pulmonar, com pressão venosa central e pressão pulmonar não pulsátil nas anomalias como ventrículos únicos funcionais.OBJECTIVE: Patients with functional single ventricle show bad survey, most of which result in cardiac failure even in the case that they are operated. The right heart bypass operations except for right atrium and right ventricle connections lack pulsatile pulmonary ventricle system besides the volume lack coming to the common ventricle. To solve the problem, we tried to create a pulmonary ventricle which produces pulsatile pressure experimentally. METHODS: We tried to form a right ventricle system which produces pulsatile pressure. The experimental model was carried on six sheep. The pressures of the created pulmonary ventricle, pulmonary artery and the left ventricle were measured after leaving the cardiopulmonary bypass. RESULTS: The mean of the

  15. Lean principles adoption in environmental management system (EMS - ISO 14001

    Directory of Open Access Journals (Sweden)

    Perumal Puvanasvaran

    2012-12-01

    Full Text Available Purpose: The purpose of this study is to examine the characteristic of the lean principles into ISO 14001 and to propose linkage of the lean principles and ISO 14001.Design/methodology/approach: To achieve the objective of the study, literature survey and quantitative research method using questionnaires survey are used.Findings and Originality/value: The findings of this study confirm that ISO 14001 certified company adopted lean production practices.  The study also proves that lean principles have positive and significant relationship with ISO 14001 EMS and the linkage can be made between lean principles and ISO 14001 to achieve Continual Improvement.Research limitations/implications: The small sizes of the sample of the participating companies are the main limitations of this study and this research mainly focuses on the manufacturing environment and services industry.Practical implications: This research show that all ISO 14001 companies do adopt at least one lean production practices and the main findings are lean principles has positive and highly significant relationship with ISO 14001 requirements.  This is because the integration of lean principles into ISO 14001 will serve practical methods for ISO14001 EMS to achieve the continual improvement.Originality/value: This research is amongst the first to study the combined lean principles with ISO 1400.  Based on the current situation, there is no integration within this two management system

  16. On the modeling of planetary plasma environments by a fully kinetic electromagnetic global model HYB-em

    Directory of Open Access Journals (Sweden)

    V. Pohjola

    2010-03-01

    Full Text Available We have developed a fully kinetic electromagnetic model to study instabilities and waves in planetary plasma environments. In the particle-in-a-cell (PIC model both ions and electrons are modeled as particles. An important feature of the developed global kinetic model, called HYB-em, compared to other electromagnetic codes is that it is built up on an earlier quasi-neutral hybrid simulation platform called HYB and that it can be used in conjunction with earlier hybrid models. The HYB models have been used during the past ten years to study globally the flowing plasma interaction with various Solar System objects: Mercury, Venus, the Moon, Mars, Saturnian moon Titan and asteroids. The new stand-alone fully kinetic model enables us to (1 study the stability of various planetary plasma regions in three-dimensional space, (2 analyze the propagation of waves in a plasma environment derived from the other global HYB models. All particle processes in a multi-ion plasma which are implemented on the HYB platform (e.g. ion-neutral-collisions, chemical processes, particle loss and production processes are also automatically included in HYB-em model.

    In this brief report we study the developed approach by analyzing the propagation of high frequency electromagnetic waves in non-magnetized plasma in two cases: We study (1 expansion of a spherical wave generated from a point source and (2 propagation of a plane wave in plasma. The analysis shows that the HYB-em model is capable of describing these space plasma situations successfully. The analysis also suggests the potential of the developed model to study both high density-high magnetic field plasma environments, such as Mercury, and low density-low magnetic field plasma environments, such as Venus and Mars.

  17. Design and modeling of an on-silicon spiral inductor library using improved EM simulations

    Science.gov (United States)

    Goni-Iturri, A.; Khemchandani, S. L.; del Pino, F. J.; Garcia, J.; Gonzalez, B.; Hernandez, A.

    2005-06-01

    This paper deals with the design and modeling of integrated spiral inductors for RF applications by means of a general purpose Electromagnetic (EM) simulator. These tools allow optimizing flexibly the inductor layout structure. The inductor performance can be obtained by using a three-dimensional design tool or a two-dimensional one. Planar 2-D or so called 2.5-Ds simulators are faster and accept complex coil geometries. We have used one of these simulators, the Advanced Design System planar EM simulator, Momentum, from Agilent. The inductor quality factor (Q) is limited, among other phenomena, by the series resistance of the metal traces and the substrate losses. Therefore the simulator requires an accurate set up of the process and simulator parameters and a correct algorithm to model metal thickness to rely on simulation results. In this paper we analyze and compare these different approaches. A high-quality factor inductor library on a 0.35 μm SiGe technology at 5 GHz is also designed in this work using the proper simulator set up. Nine of the inductors have been fabricated and measured to test the simulator reliability. Measurements taken over a frequency range from 500 MHz to 10GHz show a good agreement with 2.5-EM simulations.

  18. Tilt - ellips and rho - phase modelling of VLF EM and VLF R in Candi Umbul Magelang

    Science.gov (United States)

    Affanti, Adella Putri; Niasari, Sintia Windhi

    2017-07-01

    A research for geothermal energy is increased due to the need of green energy. The presence of geothermal manifestations indicate the existence of geothermal system. One of the geothermal manifestations is warm spring. CandiUmbul area which located in Telomoyo, Magelang has warm spring as the geothermal manifestation. Very Low Frequency (VLF) is one of geophysical method that can be used to map the subsurface in Candi Umbul, Telomoyo. VLF is a method using electromagnetic field that powered and transferred by the transmitter. The receiver read the electromagnetic signal which induce the rock and give information about the conductivity as the physical property measurred. In this research, after collecting and processing data, we modeled tilt-ellips data of VLF-EM and rho-phase data of VLF-R to explain the geothermal system of Candi Umbul. Both VLF-EM and VLF-R model were correlated for the interpretation. The model showed an anomalous conductive feature beneath the research area. The result of this research showed that the anomaly is oriented in NW-SE direction. This direction is assumed as a fluid path way of Candi Umbul which became the outflow of Telomoyo geothermal system. To prove the early deduction this research is still on going.

  19. Large-scale 3-D EM modelling with a Block Low-Rank multifrontal direct solver

    Science.gov (United States)

    Shantsev, Daniil V.; Jaysaval, Piyoosh; de la Kethulle de Ryhove, Sébastien; Amestoy, Patrick R.; Buttari, Alfredo; L'Excellent, Jean-Yves; Mary, Theo

    2017-06-01

    We put forward the idea of using a Block Low-Rank (BLR) multifrontal direct solver to efficiently solve the linear systems of equations arising from a finite-difference discretization of the frequency-domain Maxwell equations for 3-D electromagnetic (EM) problems. The solver uses a low-rank representation for the off-diagonal blocks of the intermediate dense matrices arising in the multifrontal method to reduce the computational load. A numerical threshold, the so-called BLR threshold, controlling the accuracy of low-rank representations was optimized by balancing errors in the computed EM fields against savings in floating point operations (flops). Simulations were carried out over large-scale 3-D resistivity models representing typical scenarios for marine controlled-source EM surveys, and in particular the SEG SEAM model which contains an irregular salt body. The flop count, size of factor matrices and elapsed run time for matrix factorization are reduced dramatically by using BLR representations and can go down to, respectively, 10, 30 and 40 per cent of their full-rank values for our largest system with N = 20.6 million unknowns. The reductions are almost independent of the number of MPI tasks and threads at least up to 90 × 10 = 900 cores. The BLR savings increase for larger systems, which reduces the factorization flop complexity from O(N2) for the full-rank solver to O(Nm) with m = 1.4-1.6. The BLR savings are significantly larger for deep-water environments that exclude the highly resistive air layer from the computational domain. A study in a scenario where simulations are required at multiple source locations shows that the BLR solver can become competitive in comparison to iterative solvers as an engine for 3-D controlled-source electromagnetic Gauss-Newton inversion that requires forward modelling for a few thousand right-hand sides.

  20. The PX-EM algorithm for fast stable fitting of Henderson's mixed model

    Directory of Open Access Journals (Sweden)

    Van Dyk David A

    2000-03-01

    Full Text Available Abstract This paper presents procedures for implementing the PX-EM algorithm of Liu, Rubin and Wu to compute REML estimates of variance covariance components in Henderson's linear mixed models. The class of models considered encompasses several correlated random factors having the same vector length e.g., as in random regression models for longitudinal data analysis and in sire-maternal grandsire models for genetic evaluation. Numerical examples are presented to illustrate the procedures. Much better results in terms of convergence characteristics (number of iterations and time required for convergence are obtained for PX-EM relative to the basic EM algorithm in the random regression.

  1. Nervous and muscle system development in <em>Phascolion strombusem> (Sipuncula)

    DEFF Research Database (Denmark)

    Wanninger, Andreas; Koop, Demian; Bromham, Lindell

    2005-01-01

    Recent interpretations of developmental gene expression patterns propose that the last common metazoan ancestor was segmented, although most animal phyla show no obvious signs of segmentation. Developmental studies of non-model system trochozoan taxa may shed light on this hypothesis by assessing...

  2. Broadband EM radiation amplification by means of a monochromatically driven two-level system

    Science.gov (United States)

    Soldatov, Andrey V.

    2017-02-01

    It is shown that a two-level quantum system possessing dipole moment operator with permanent non-equal diagonal matrix elements and driven by external semiclassical monochromatic high-frequency electromagnetic (EM) (laser) field can amplify EM radiation waves of much lower frequency.

  3. Global Convergence of the EM Algorithm for Unconstrained Latent Variable Models with Categorical Indicators

    Science.gov (United States)

    Weissman, Alexander

    2013-01-01

    Convergence of the expectation-maximization (EM) algorithm to a global optimum of the marginal log likelihood function for unconstrained latent variable models with categorical indicators is presented. The sufficient conditions under which global convergence of the EM algorithm is attainable are provided in an information-theoretic context by…

  4. Covariance Structure Model Fit Testing under Missing Data: An Application of the Supplemented EM Algorithm

    Science.gov (United States)

    Cai, Li; Lee, Taehun

    2009-01-01

    We apply the Supplemented EM algorithm (Meng & Rubin, 1991) to address a chronic problem with the "two-stage" fitting of covariance structure models in the presence of ignorable missing data: the lack of an asymptotically chi-square distributed goodness-of-fit statistic. We show that the Supplemented EM algorithm provides a…

  5. Modelling Railway Interlocking Systems

    DEFF Research Database (Denmark)

    Lindegaard, Morten Peter; Viuf, P.; Haxthausen, Anne Elisabeth

    2000-01-01

    In this report we present a model of interlocking systems, and describe how the model may be validated by simulation. Station topologies are modelled by graphs in which the nodes denote track segments, and the edges denote connectivity for train traÆc. Points and signals are modelled by annotatio...

  6. Design of Customer Satisfaction Measurement Index System of EMS Service

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    This paper discusses the design of a customer satisfaction measurement index system of erpress mail service. It presents objectives and principles of the design based on hierarchical structures. We have devised a diagram for modeling customer satisfaction, and a detailed analysis of customer satisfaction is conducted. This paper presents our customer satisfaction model and analysis results.

  7. Endometriose: modelo experimental em ratas Endometriosis: experimental model in rats

    Directory of Open Access Journals (Sweden)

    Eduardo Schor

    1999-06-01

    Full Text Available Objetivo: divulgar a metodologia da indução de endometriose experimental em animais de laboratório. Método: utilizamos ratas albinas, virgens, adultas de aproximadamente três meses de idade, que foram inicialmente anestesiadas pelo éter etílico. Aberta a cavidade abdominal, identificamos os cornos uterinos e retiramos um fragmento de aproximadamente 4 cm do corno uterino direito. Esse fragmento foi mergulhado em solução fisiológica e sob lupa estereoscópica foi separado o endométrio do miométrio e feitos retângulos de aproximadamente 4 por 5 mm. Esses foram fixados por meio de fio de sutura, sobre vasos sangüíneos visíveis a olho nu, na parede lateral do abdômen, tomando-se sempre o cuidado de manter a porção do endométrio livre voltada para a luz da cavidade abdominal. Após 21 dias os animais foram novamente operados para verificarmos o tamanho dos implantes e para retirada do endométrio ectópico para análise histológica. Resultados: macroscopicamente observamos crescimento significativo dos implantes endometriais. Ao exame microscópico pudemos observar a presença de epitélio glandular e estroma semelhantes ao do endométrio tópico. Conclusões: o modelo utilizado reproduz a doença, em ratas, sendo método auxiliar de valia para estudar esta afecção, principalmente a ação de medicamentos sobre esses implantes.Purpose: to demonstrate the experimental endometriosis induction in animals. Method: we used adult female Wistar rats weighing 200 - 250 g anesthetized with ethyl ether to open the abdominal cavity. After identifying the uterine horns, we removed an approximately 4 cm fragment from the right uterine horn. This fragment was placed in physiological saline and, with the aid of a stereoscopic magnifying glass, the endometrium was separated from the myometrium and cut into rectangles of approximately 4 x 5 mm. These rectangles were fastened to the lateral abdominal wall near great blood vessels, taking care

  8. WMS - Warehouse Management System: Benfeitorias Proporcionadas pela Implantação em um Centro Distribuidor e Atacadista

    National Research Council Canada - National Science Library

    Lévistone Fávero; Sabrina Nascimento; Suzete Antonieta Lizote; Miguel Angel Verdinelli

    2016-01-01

    ... implantação de um sistema WMS (WAREHOUSE MANAGEMENT SYSTEM) de gerenciamento de armazéns, em um centro distribuidor e atacadista do segmento de higiene pessoal e limpeza em Cordilheira Alta/SC...

  9. Behaviour of oligodendrocytes and Schwann cells in an experimental model of toxic demyelination of the central nervous system Comportamento de oligodendrócitos e células de Schwann em modelo experimental de desmielinização tóxica do sistema nervoso central

    Directory of Open Access Journals (Sweden)

    Dominguita Lühers Graça

    2001-06-01

    Full Text Available Oligodendrocytes and Schwann cells are engaged in myelin production, maintenance and repairing respectively in the central nervous system (CNS and the peripheral nervous system (PNS. Whereas oligodendrocytes act only within the CNS, Schwann cells are able to invade the CNS in order to make new myelin sheaths around demyelinated axons. Both cells have some limitations in their activities, i.e. oligodendrocytes are post-mitotic cells and Schwann cells only get into the CNS in the absence of astrocytes. Ethidium bromide (EB is a gliotoxic chemical that when injected locally within the CNS, induce demyelination. In the EB model of demyelination, glial cells are destroyed early after intoxication and Schwann cells are free to approach the naked central axons. In normal Wistar rats, regeneration of lost myelin sheaths can be achieved as early as thirteen days after intoxication; in Wistar rats immunosuppressed with cyclophosphamide the process is delayed and in rats administered cyclosporine it may be accelerated. Aiming the enlightening of those complex processes, all events concerning the myelinating cells in an experimental model are herein presented and discussed.Oligodendrócitos e células de Schwann realizam a produção e manutenção das bainhas de mielina, respectivamente no sistema nervoso central (SNC e periférico (SNP. As células de Schwann, à diferença dos oligodendrócitos, são capazes de invadir o SNC para remielinizar axônios desmielinizados, sempre que os astrócitos tenham sido destruídos. O brometo de etídio é uma droga gliotóxica usada para induzir desmielinização com o desaparecimento precoce de astrócitos, de modo que as células de Schwann têm liberdade para invadir o SNC. Em ratos Wistar normais, a remielinização é detectada treze dias após desmielinização; em ratos Wistar imunossuprimidos com ciclofosfamida a reparação do tecido é tardia, enquanto que em animais tratados com ciclosporina ela

  10. State-space models - from the EM algorithm to a gradient approach

    DEFF Research Database (Denmark)

    Olsson, Rasmus Kongsgaard; Petersen, Kaare Brandt; Lehn-Schiøler, Tue

    2007-01-01

    Slow convergence is observed in the EM algorithm for linear state-space models. We propose to circumvent the problem by applying any off-the-shelf quasi-Newton-type optimizer, which operates on the gradient of the log-likelihood function. Such an algorithm is a practical alternative due to the fact...... that the exact gradient of the log-likelihood function can be computed by recycling components of the expectation-maximization (EM) algorithm. We demonstrate the efficiency of the proposed method in three relevant instances of the linear state-space model. In high signal-to-noise ratios, where EM is particularly...

  11. An economic toolkit for identifying the cost of emergency medical services (EMS) systems: detailed methodology of the EMS Cost Analysis Project (EMSCAP).

    Science.gov (United States)

    Lerner, E Brooke; Garrison, Herbert G; Nichol, Graham; Maio, Ronald F; Lookman, Hunaid A; Sheahan, William D; Franz, Timothy R; Austad, James D; Ginster, Aaron M; Spaite, Daniel W

    2012-02-01

    Calculating the cost of an emergency medical services (EMS) system using a standardized method is important for determining the value of EMS. This article describes the development of a methodology for calculating the cost of an EMS system to its community. This includes a tool for calculating the cost of EMS (the "cost workbook") and detailed directions for determining cost (the "cost guide"). The 12-step process that was developed is consistent with current theories of health economics, applicable to prehospital care, flexible enough to be used in varying sizes and types of EMS systems, and comprehensive enough to provide meaningful conclusions. It was developed by an expert panel (the EMS Cost Analysis Project [EMSCAP] investigator team) in an iterative process that included pilot testing the process in three diverse communities. The iterative process allowed ongoing modification of the toolkit during the development phase, based upon direct, practical, ongoing interaction with the EMS systems that were using the toolkit. The resulting methodology estimates EMS system costs within a user-defined community, allowing either the number of patients treated or the estimated number of lives saved by EMS to be assessed in light of the cost of those efforts. Much controversy exists about the cost of EMS and whether the resources spent for this purpose are justified. However, the existence of a validated toolkit that provides a standardized process will allow meaningful assessments and comparisons to be made and will supply objective information to inform EMS and community officials who are tasked with determining the utilization of scarce societal resources.

  12. Multiscale modeling for classification of SAR imagery using hybrid EM algorithm and genetic algorithm

    Institute of Scientific and Technical Information of China (English)

    Xianbin Wen; Hua Zhang; Jianguang Zhang; Xu Jiao; Lei Wang

    2009-01-01

    A novel method that hybridizes genetic algorithm (GA) and expectation maximization (EM) algorithm for the classification of syn-thetic aperture radar (SAR) imagery is proposed by the finite Gaussian mixtures model (GMM) and multiscale autoregressive (MAR)model. This algorithm is capable of improving the global optimality and consistency of the classification performance. The experiments on the SAR images show that the proposed algorithm outperforms the standard EM method significantly in classification accuracy.

  13. Use of the AIC with the EM algorithm: A demonstration of a probability model selection technique

    Energy Technology Data Exchange (ETDEWEB)

    Glosup, J.G.; Axelrod M.C. [Lawrence Livermore National Lab., CA (United States)

    1994-11-15

    The problem of discriminating between two potential probability models, a Gaussian distribution and a mixture of Gaussian distributions, is considered. The focus of our interest is a case where the models are potentially non-nested and the parameters of the mixture model are estimated through the EM algorithm. The AIC, which is frequently used as a criterion for discriminating between non-nested models, is modified to work with the EM algorithm and is shown to provide a model selection tool for this situation. A particular problem involving an infinite mixture distribution known as Middleton`s Class A model is used to demonstrate the effectiveness and limitations of this method.

  14. Selected System Models

    Science.gov (United States)

    Schmidt-Eisenlohr, F.; Puñal, O.; Klagges, K.; Kirsche, M.

    Apart from the general issue of modeling the channel, the PHY and the MAC of wireless networks, there are specific modeling assumptions that are considered for different systems. In this chapter we consider three specific wireless standards and highlight modeling options for them. These are IEEE 802.11 (as example for wireless local area networks), IEEE 802.16 (as example for wireless metropolitan networks) and IEEE 802.15 (as example for body area networks). Each section on these three systems discusses also at the end a set of model implementations that are available today.

  15. Characteristics of hospitals diverting ambulances in a California EMS system.

    Science.gov (United States)

    Kahn, Christopher A; Stratton, Samuel J; Anderson, Craig L

    2014-02-01

    While several reports discuss controversies regarding ambulance diversion from acute care hospitals and the mortality, financial, and resource effects, there is scant literature related to the effect of hospital characteristics. The objective of this study was to describe specific paramedic receiving center characteristics that are associated with ambulance diversion rates in an Emergency Medical Services system. A retrospective observational study design was used. The study was performed in a suburban EMS system with 27 paramedic receiving centers studied; one additional hospital present at the beginning of the study period (2000-2008) was excluded due to lack of recent data. Hospital-level and population-level characteristics were gathered, including diversion rate (hours on diversion/total hours open), for-profit status, number of specialty services (including trauma, burn, cardiovascular surgery, renal transplant services, cardiac catheterization capability [both interventional and diagnostic], and burn surgery), average inpatient bed occupancy rate (total patient days/licensed bed days), annual emergency department (ED) volume (patients per year), ED admission rate (percent of ED patients admitted), and percent of patients leaving without being seen. Demographic characteristics included percent of persons in each hospital's immediate census tract below the 100% and 200% poverty lines (each considered separately), and population density within the census tract. Bivariate and regression analyses were performed. Diversion rates for the 27 centers ranged from 0.3%-14.5% (median 4.5%). Average inpatient bed occupancy rate and presence of specialty services were correlated with an increase in diversion rate; occupancy rate showed a 0.08% increase in diversion hours per 1% increase in occupancy rate (95% CI, 0.01%-0.16%), and hospitals with specialty services had, on average, a 4.1% higher diversion rate than other hospitals (95% CI, 1.6%-6.7%). Other characteristics

  16. Validation of Advanced EM Models for UXO Discrimination

    CERN Document Server

    Weichman, Peter B

    2012-01-01

    The work reported here details basic validation of our advanced physics-based EMI forward and inverse models against data collected by the NRL TEMTADS system. The data was collected under laboratory-type conditions using both artificial spheroidal targets and real UXO. The artificial target models are essentially exact, and enable detailed comparison of theory and data in support of measurement platform characterization and target identification. Real UXO targets cannot be treated exactly, but it is demonstrated that quantitative comparisons of the data with the spheroid models nevertheless aids in extracting key target discrimination information, such as target geometry and hollow target shell thickness.

  17. Modeling cellular systems

    CERN Document Server

    Matthäus, Franziska; Pahle, Jürgen

    2017-01-01

    This contributed volume comprises research articles and reviews on topics connected to the mathematical modeling of cellular systems. These contributions cover signaling pathways, stochastic effects, cell motility and mechanics, pattern formation processes, as well as multi-scale approaches. All authors attended the workshop on "Modeling Cellular Systems" which took place in Heidelberg in October 2014. The target audience primarily comprises researchers and experts in the field, but the book may also be beneficial for graduate students.

  18. Multiscale Cloud System Modeling

    Science.gov (United States)

    Tao, Wei-Kuo; Moncrieff, Mitchell W.

    2009-01-01

    The central theme of this paper is to describe how cloud system resolving models (CRMs) of grid spacing approximately 1 km have been applied to various important problems in atmospheric science across a wide range of spatial and temporal scales and how these applications relate to other modeling approaches. A long-standing problem concerns the representation of organized precipitating convective cloud systems in weather and climate models. Since CRMs resolve the mesoscale to large scales of motion (i.e., 10 km to global) they explicitly address the cloud system problem. By explicitly representing organized convection, CRMs bypass restrictive assumptions associated with convective parameterization such as the scale gap between cumulus and large-scale motion. Dynamical models provide insight into the physical mechanisms involved with scale interaction and convective organization. Multiscale CRMs simulate convective cloud systems in computational domains up to global and have been applied in place of contemporary convective parameterizations in global models. Multiscale CRMs pose a new challenge for model validation, which is met in an integrated approach involving CRMs, operational prediction systems, observational measurements, and dynamical models in a new international project: the Year of Tropical Convection, which has an emphasis on organized tropical convection and its global effects.

  19. QSAR Modeling on Benzo[<em>c>]phenanthridine Analogues as Topoisomerase I Inhibitors and Anti-cancer Agents

    Directory of Open Access Journals (Sweden)

    Thi-Ngoc-Phuong Huynh

    2012-05-01

    Full Text Available Benzo[<em>c>]phenanthridine (BCP derivatives were identified as topoisomerase I (TOP-I targeting agents with pronounced antitumor activity. In this study, hologram-QSAR, 2D-QSAR and 3D-QSAR models were developed for BCPs on topoisomerase I inbibitory activity and cytotoxicity against seven tumor cell lines including RPMI8402, CPT-K5, P388, CPT45, KB3-1, KBV-1and KBH5.0. The hologram, 2D, and 3D-QSAR models were obtained with the square of correlation coefficient R2 = 0.58 − 0.77, the square of the crossvalidation coefficient q2 = 0.41 − 0.60 as well as the external set’s square of predictive correlation coefficient r2 = 0.51 − 0.80. Moreover, the assessment method based on reliability test with confidence level of 95% was used to validate the predictive power of QSAR models and to prevent over-fitting phenomenon of classical QSAR models. Our QSAR model could be applied to design new analogues of BCPs with higher antitumor and topoisomerase I inhibitory activity.

  20. Dynamic Systems Modeling

    Directory of Open Access Journals (Sweden)

    Sorin Dan ŞANDOR

    2003-01-01

    Full Text Available System Dynamics was introduced by Jay W. Forrester in the 1960s. Since then the methodology was adopted in many areas of natural or social sciences. This article tries to present briefly how this methodology works, both as Systems Thinking and as Modelling with Vensim computer software.

  1. A heuristic model for planning problem solution of reactive in electric power systems; Um modelo heuristico para solucao do problema de planejamento de reativos em sistemas de energia eletrica

    Energy Technology Data Exchange (ETDEWEB)

    Mantovani, Jose Roberto Sanches

    1995-02-01

    This work introduces a model to solve the planning problem of reactive in electric power systems. The proposed method uses mixed integer linear programming and is solved using implicit enumeration (binary search). The special heuristics to reduce candidates' initial set and to obtain discreet solutions are adopted. They were going accomplished two algorithm implementations, one sequential and other parallel. The implementation parallel uses an asynchronous programming model and is adjusted for distributed memory computer. Defined a bars candidates set for the new reactive sources allocation, the developed program supplies the location and the reactive sources magnitude that must be allocated in the system, considering safety and operation restrictions. The implementation parallel performance is evaluated for three real systems of 309, 725 and 810 bars. The results for the test systems IEEE30 and IEEE118, and the three real systems used in the implementation parallel evaluation are also presented.

  2. Modeling Sustainable Food Systems

    Science.gov (United States)

    Allen, Thomas; Prosperi, Paolo

    2016-05-01

    The processes underlying environmental, economic, and social unsustainability derive in part from the food system. Building sustainable food systems has become a predominating endeavor aiming to redirect our food systems and policies towards better-adjusted goals and improved societal welfare. Food systems are complex social-ecological systems involving multiple interactions between human and natural components. Policy needs to encourage public perception of humanity and nature as interdependent and interacting. The systemic nature of these interdependencies and interactions calls for systems approaches and integrated assessment tools. Identifying and modeling the intrinsic properties of the food system that will ensure its essential outcomes are maintained or enhanced over time and across generations, will help organizations and governmental institutions to track progress towards sustainability, and set policies that encourage positive transformations. This paper proposes a conceptual model that articulates crucial vulnerability and resilience factors to global environmental and socio-economic changes, postulating specific food and nutrition security issues as priority outcomes of food systems. By acknowledging the systemic nature of sustainability, this approach allows consideration of causal factor dynamics. In a stepwise approach, a logical application is schematized for three Mediterranean countries, namely Spain, France, and Italy.

  3. A fuzzy set decision making model applied to electric power systems operation planning; Um modelo de decisao baseado em conjuntos nebulosos aplicado ao planejamento da operacao de sistemas de energia eletrica

    Energy Technology Data Exchange (ETDEWEB)

    Valenca, Mauricio Mendonca

    1993-05-01

    The power system static operation planning has a main objective the determination of performance strategies which satisfy operational criteria. A fuzzy set decision model which takes the load attainment and the compromise between optimality and critical operational constraints into account is presented. The prime characteristic of this methodology is the incorporation of the planner`s preferences structure in a decision process modeled by fuzzy sets. A routine of optimal power flow calculation is used as a computational tool for solving the nonlinear model of the electric power system and for defining the universe of discourse of the decision-making problem. tests were carried on a 30-bus IEEE system in order to find a compromise solution of electric operational goal versus reactive power generation limits. Results and conclusions are presented. (author) 28 refs., 32 figs.

  4. System architecture and market aspects of an European Land Mobile Satellite System via EMS

    Science.gov (United States)

    Ananasso, F.; Mistretta, I.

    1992-03-01

    The paper describes an implementation scenario of a Land Mobile Satellite System via the EMS (European Mobile System) payload embarked on Italsat F-2. Some emphasis is given on market issues aiming at singling out business niches of Land Mobile Satellite Services (LMSS) in Europe. Other crucial issues exist such as: the alternate/competitive systems, the problems of interworking with other existing and/or planned systems, the definition of network architecture that better fits the user requirements, the marketing strategy and, last but not least, the financial evaluation of the project. The paper, on the basis of a study performed by Telespazio on behalf of ESA, discusses some of these issues with emphasis on competitive market aspects.

  5. Modeling Complex Systems

    CERN Document Server

    Boccara, Nino

    2010-01-01

    Modeling Complex Systems, 2nd Edition, explores the process of modeling complex systems, providing examples from such diverse fields as ecology, epidemiology, sociology, seismology, and economics. It illustrates how models of complex systems are built and provides indispensable mathematical tools for studying their dynamics. This vital introductory text is useful for advanced undergraduate students in various scientific disciplines, and serves as an important reference book for graduate students and young researchers. This enhanced second edition includes: . -recent research results and bibliographic references -extra footnotes which provide biographical information on cited scientists who have made significant contributions to the field -new and improved worked-out examples to aid a student’s comprehension of the content -exercises to challenge the reader and complement the material Nino Boccara is also the author of Essentials of Mathematica: With Applications to Mathematics and Physics (Springer, 2007).

  6. GIS-modelling the distribution of <em>Rattus norvegicusem> in urban areas using non toxic attractive baits

    Directory of Open Access Journals (Sweden)

    Roberto Sacchi

    2008-07-01

    Full Text Available Abstract GIS supplies a useful way for analysing and modelling spatial distribution of brown rats <em>Rattus norvegicusem> in urban areas, supplying maps that predict the occurrence of rats over larger areas. However, two alternative procedures can be used: landscape-based models, which use habitat variables derived from remote sensing satellites or other thematic maps, and interpolation techniques, which convert point samples of species abundance. The first procedure has been previously applied, while the second has never been used until now. In this study, we valued the effectiveness of the interpolating procedure by modelling the distribution of brown rats in a large urban area of northern Italy. During spring and autumn 2004, we positioned non toxic baits in 119 spots distributed over the whole urbanized area of the city and we generated maps of rat presence/absence for the two seasons. Brown rats were irregularly scattered over the city and concentrated mainly around rivers and ditches, as well in the historic centre, particularly where buildings suffer poor maintenance. Seasonal variation of rat occurrence was also detected. Brown rat occurrence may be reliably predicted by the interpolation procedure, which appeared to be a more efficient approach to rat distribution modelling compared with landscape-based procedures. Riassunto Modelli GIS della distribuzione di <em>Rattus norvegicusem> in ambiente urbano con utilizzo di esche non tossiche. I programmi GIS rappresentano un utile strumento per analizzare e modellizzare la distribuzione del ratto delle chiaviche <em>Rattus norvegicusem> nelle aree urbane, fornendo mappe in grado di predire la presenza di questa specie su vaste aree. A questo scopo possono essere impiegate due procedure alternative: i modelli basati sul paesaggio, che utilizzano le caratteristiche ambientali desunte da mappe tematiche o immagini satellitari

  7. Analysis of Applications to Improve the Energy Savings in Residential Buildings Based on Systemic Quality Model

    Directory of Open Access Journals (Sweden)

    Antoni Fonseca i Casas

    2016-10-01

    Full Text Available Creating a definition of the features and the architecture of a new Energy Management Software (EMS is complex because different professionals will be involved in creating that definition and in using the tool. To simplify this definition and aid in the eventual selection of an existing EMS to fit a specific need, a set of metrics that considers the primary issues and drawbacks of the EMS is decisive. This study proposes a set of metrics to evaluate and compare EMS applications. Using these metrics will allow professionals to highlight the tendencies and detect the drawbacks of current EMS applications and to eventually develop new EMS applications based on the results of the analysis. This study presents a list of the applications to be examined and describes the primary issues to be considered in the development of a new application. This study follows the Systemic Quality Model (SQMO, which has been used as a starting point to develop new EMS, but can also be used to select an existing EMS that fits the goals of a company. Using this type of analysis, we were able to detect the primary features desired in an EMS software. These features are numerically scaled, allowing professionals to select the most appropriate EMS that fits for their purposes. This allows the development of EMS utilizing an iterative and user-centric approach. We can apply this methodology to guide the development of future EMS and to define the priorities that are desired in this type of software.

  8. Distributed generation systems model

    Energy Technology Data Exchange (ETDEWEB)

    Barklund, C.R.

    1994-12-31

    A slide presentation is given on a distributed generation systems model developed at the Idaho National Engineering Laboratory, and its application to a situation within the Idaho Power Company`s service territory. The objectives of the work were to develop a screening model for distributed generation alternatives, to develop a better understanding of distributed generation as a utility resource, and to further INEL`s understanding of utility concerns in implementing technological change.

  9. Clustering dynamic textures with the hierarchical em algorithm for modeling video.

    Science.gov (United States)

    Mumtaz, Adeel; Coviello, Emanuele; Lanckriet, Gert R G; Chan, Antoni B

    2013-07-01

    Dynamic texture (DT) is a probabilistic generative model, defined over space and time, that represents a video as the output of a linear dynamical system (LDS). The DT model has been applied to a wide variety of computer vision problems, such as motion segmentation, motion classification, and video registration. In this paper, we derive a new algorithm for clustering DT models that is based on the hierarchical EM algorithm. The proposed clustering algorithm is capable of both clustering DTs and learning novel DT cluster centers that are representative of the cluster members in a manner that is consistent with the underlying generative probabilistic model of the DT. We also derive an efficient recursive algorithm for sensitivity analysis of the discrete-time Kalman smoothing filter, which is used as the basis for computing expectations in the E-step of the HEM algorithm. Finally, we demonstrate the efficacy of the clustering algorithm on several applications in motion analysis, including hierarchical motion clustering, semantic motion annotation, and learning bag-of-systems (BoS) codebooks for dynamic texture recognition.

  10. Trophic systems and chorology: data from shrews, moles and voles of Italy preyed by the barn owl / Sistemi trofici e corologia: dati su <em>Soricidae>, <em>Talpidae> ed <em>Arvicolidae> d'Italia predati da <em>Tyto albaem> (Scopoli 1769

    Directory of Open Access Journals (Sweden)

    Longino Contoli

    1986-12-01

    Full Text Available Abstract In small Mammals biogeography, available data are up to now by far too scanty for elucidate the distribution of a lot of taxa, especially with regard to the absence from a given area. In this respect, standardized quantitative sampling techniques, like Owl pellets analysis can enable not only to enhance faunistic knowledges, but also to estimate the actual absence probability of a given taxon "m", lacking from the diet of an individual raptor. For the last purpose, the relevant frequencies of "m" in the other ecologically similar sites of the same raptor species diets are averaged ($f_m$ : the relevant standard error (multiplicated by a coefficient, according to the desired degree of accuracy, in relation of the integral of probabilities subtracted ($overline{F}_m - a E$: then, the probability that a single specimen is not pertaining to "m" is obtained ($P_0 = 1 - F_m + a E$; lastly, the desiderate accuracy probability ($P_d$ is chosen. Now, "$N_d$" (the number of individuals of all prey species in a single site needed for obtain, with the desired probability, a specimen at least of "m" is obtained through $$N = frac{ln P_d}{ln P_0}$$ Obviously, every site-diet with more than "N" preyed individuals and without any "i" specimen is considered to be lacking of such taxon. A "usefulness index" for the above purposes is outlined and checked about three raptors. Some exanples about usefulness of the Owl pellet analysis method in biogeography are given, concerning <em>Tyto albaem> diets in peninsular Italy about: - <em>Sorex minutusem>, lacking in some quite insulated areas; - <em>Sorex araneusem> (sensu stricto, after GRAF et al., 1979, present also in lowland areas in Emilia-Romagna; - <em>Crocidura suaveolensem> and - <em>Suncus etruscusem>, present also in the southermost part of Calabria (Reggio province; - <em>Talpa caecaem>, present also in the Antiapennines of Latium (Cimini mounts; - <em>Talpa romanaem

  11. Modeling the earth system

    Energy Technology Data Exchange (ETDEWEB)

    Ojima, D. [ed.

    1992-12-31

    The 1990 Global Change Institute (GCI) on Earth System Modeling is the third of a series organized by the Office for Interdisciplinary Earth Studies to look in depth at particular issues critical to developing a better understanding of the earth system. The 1990 GCI on Earth System Modeling was organized around three themes: defining critical gaps in the knowledge of the earth system, developing simplified working models, and validating comprehensive system models. This book is divided into three sections that reflect these themes. Each section begins with a set of background papers offering a brief tutorial on the subject, followed by working group reports developed during the institute. These reports summarize the joint ideas and recommendations of the participants and bring to bear the interdisciplinary perspective that imbued the institute. Since the conclusion of the 1990 Global Change Institute, research programs, nationally and internationally, have moved forward to implement a number of the recommendations made at the institute, and many of the participants have maintained collegial interactions to develop research projects addressing the needs identified during the two weeks in Snowmass.

  12. A DISPATCHER TRAINING SIMULATOR SYSTEM INTEGRATED WITH THE EXIST SCADA/EMS

    Institute of Scientific and Technical Information of China (English)

    华斌; 周建中

    2004-01-01

    To utilize exist SCADA(Supervisory Control and Data Acquisition)/EMS (Energy Management System) fully and economize capital, Henan Electric Power Dispatching and Communication Center in China established a set of Henan Dispatcher Training Simulator (HNDTS) base on its exist SCADA/EMS. In order to integrated with exist SCADA/EMS, the integration method and technique are proposed. Graph data integration discussed with emphasis. After integration implemented, HNDTS can share all data with SCADA/EMS and dispatchers can be trained in same environment as real work situation, in the same time it can avoid amout of work of maintenance engineers. Both advantages and disadvantages of integration are analyzed. In the end of paper, the requirement for future DTS is put forward base on the experience of author.

  13. A spatially constrained generative model and an EM algorithm for image segmentation.

    Science.gov (United States)

    Diplaros, Aristeidis; Vlassis, Nikos; Gevers, Theo

    2007-05-01

    In this paper, we present a novel spatially constrained generative model and an expectation-maximization (EM) algorithm for model-based image segmentation. The generative model assumes that the unobserved class labels of neighboring pixels in the image are generated by prior distributions with similar parameters, where similarity is defined by entropic quantities relating to the neighboring priors. In order to estimate model parameters from observations, we derive a spatially constrained EM algorithm that iteratively maximizes a lower bound on the data log-likelihood, where the penalty term is data-dependent. Our algorithm is very easy to implement and is similar to the standard EM algorithm for Gaussian mixtures with the main difference that the labels posteriors are "smoothed" over pixels between each E- and M-step by a standard image filter. Experiments on synthetic and real images show that our algorithm achieves competitive segmentation results compared to other Markov-based methods, and is in general faster.

  14. 3D time-domain airborne EM forward modeling with topography

    Science.gov (United States)

    Yin, Changchun; Qi, Yanfu; Liu, Yunhe; Cai, Jing

    2016-11-01

    The time-domain finite-difference method has been widely used in simulation of the electromagnetic field diffusion. However, this method is severely restricted by the mesh size and time step. To overcome the defect, we adopted edge finite-element method for unstructured grid with Backward Euler method to conduct 3D airborne electromagnetic forward modeling directly in time-domain. The tetrahedral meshes provide the flexibility required for representing the rugged topography and complex-shape anomalous bodies. We simulated the practical shape, size and attitude of transmitting source by directly setting the loop into the well-generated grids. The characteristic properties of vector basic functions guarantee automatic satisfaction of divergence-free property of electric fields. The Galerkin's method is used to discretize the governing equations and a direct solver is adopted to solve the large sparse linear system. We adopted an algorithm with constant step in each time segment to speed up the forward modeling. Further we introduced the local mesh strategy to reduce the calculations, in which an optimized grid is designed for each sounding station. We check the accuracy of our 3D modeling results against the solution for a homogenous half-space and those for a buried vertical plate model using integral equation. The numerical experiments for a hill, a valley or undulating topography model with buried anomalous bodies were further studied that show that the topography has a serious effect on airborne EM data.

  15. Data for Environmental Modeling (D4EM): Background and Applications of Data Automation

    Science.gov (United States)

    The Data for Environmental Modeling (D4EM) project demonstrates the development of a comprehensive set of open source software tools that overcome obstacles to accessing data needed by automating the process of populating model input data sets with environmental data available fr...

  16. Mechanical Systems, Classical Models

    CERN Document Server

    Teodorescu, Petre P

    2009-01-01

    This third volume completes the Work Mechanical Systems, Classical Models. The first two volumes dealt with particle dynamics and with discrete and continuous mechanical systems. The present volume studies analytical mechanics. Topics like Lagrangian and Hamiltonian mechanics, the Hamilton-Jacobi method, and a study of systems with separate variables are thoroughly discussed. Also included are variational principles and canonical transformations, integral invariants and exterior differential calculus, and particular attention is given to non-holonomic mechanical systems. The author explains in detail all important aspects of the science of mechanics, regarded as a natural science, and shows how they are useful in understanding important natural phenomena and solving problems of interest in applied and engineering sciences. Professor Teodorescu has spent more than fifty years as a Professor of Mechanics at the University of Bucharest and this book relies on the extensive literature on the subject as well as th...

  17. NEP systems model

    Science.gov (United States)

    George, Jeffrey A.

    A new nuclear electric propulsion (NEP) systems analysis code is discussed. The new code is modular and consists of a driver code and various subsystem models. The code models five different subsystems: (1) reactor/shield; (2) power conversion; (3) heat rejection; (4) power management and distribution (PMAD); and (5) thrusters. The code optimizes for the following design criteria: minimum mass; minimum radiator area; and low mass/low area. The code also optimizes the following parameters: separation distance; temperature ratio; pressure ratio; and transmission frequency. The discussion is presented in vugraph form.

  18. National Energy Modeling System

    Energy Technology Data Exchange (ETDEWEB)

    Skinner, C.W. (Energy Information Administration, Washington, DC (United States))

    1993-01-01

    The Energy Information Administration is developing a new National Energy Modeling System to provide annual forecasts of energy supply, demand, and prices on a regional basis in the United States and, to a limited extent, in the rest of the world. The design for the system was based on a requirements analysis, a comparison of requirements with existing modeling capabilities, and a series of widely circulated issue papers defining the choices and tradeoffs for 13 key design decisions. An initial prototpye of the new NEMS was implemented in late 1992, with a more complete, operational version in 1993. NEMS is expected to provide EIA and other users with a greatly enhanced ability to illustrate quickly and effectively the effects of a wide range of energy policy proposals.

  19. Modeling Novo Nordisk Production Systems

    DEFF Research Database (Denmark)

    Miller, Thomas Dedenroth

    1997-01-01

    This report describes attributes of models and systems, and how models can be used for description of production systems. There are special attention on the 'Theory of Domains'.......This report describes attributes of models and systems, and how models can be used for description of production systems. There are special attention on the 'Theory of Domains'....

  20. Experience with the EM-60 electromagnetic system for geothermal exploration in Nevada

    Energy Technology Data Exchange (ETDEWEB)

    Wilt, M.; Goldstein, N.E.; Stark, M.; Haught, J.R.; Morrison, H.F.

    1981-09-01

    Lawrence Berkeley Laboratory (LBL) conducted controlled-source electromagnetic (EM) surveys at three geothermal prospects in northern Nevada. Over 40 soundings were made in Panther Canyon (Grass Valley), near Winnemucca; Soda Lakes, near Fallon; and McCoy, west of Austin, to test and demonstrate the applicability of LBL's EM-60 system to geothermal exploration. The EM-60 is a frequency-domain system using three-component magnetic detection. Typically, +-65 A is applied to an 100-m-diameter four-turn horizontal loop, generating a dipole moment >10/sup 6/ MKS over the frequency range 10/sup -3/ to 10/sup -3/ Hz. With such a source loop, soundings were made, at transmitter-receiver separations of up to 4 km, providing a maximum depth of penetration of 4 km.

  1. Study of pre-seismic kHz EM emissions by means of complex systems

    Science.gov (United States)

    Balasis, Georgios; Papadimitriou, Constantinos; Eftaxias, Konstantinos

    2010-05-01

    The field of study of complex systems holds that the dynamics of complex systems are founded on universal principles that may used to describe disparate problems ranging from particle physics to economies of societies. A corollary is that transferring ideas and results from investigators in hitherto disparate areas will cross-fertilize and lead to important new results. It is well-known that the Boltzmann-Gibbs statistical mechanics works best in dealing with systems composed of either independent subsystems or interacting via short-range forces, and whose subsystems can access all the available phase space. For systems exhibiting long-range correlations, memory, or fractal properties, non-extensive Tsallis statistical mechanics becomes the most appropriate mathematical framework. As it was mentioned a central property of the magnetic storm, solar flare, and earthquake preparation process is the possible occurrence of coherent large-scale collective with a very rich structure, resulting from the repeated nonlinear interactions among collective with a very rich structure, resulting from the repeated nonlinear interactions among its constituents. Consequently, the non-extensive statistical mechanics is an appropriate regime to investigate universality, if any, in magnetic storm, solar flare, earthquake and pre-failure EM emission occurrence. A model for earthquake dynamics coming from a non-extensive Tsallis formulation, starting from first principles, has been recently introduced. This approach leads to a Gutenberg-Richter type law for the magnitude distribution of earthquakes which provides an excellent fit to seismicities generated in various large geographic areas usually identified as "seismic regions". We examine whether the Gutenberg-Richter law corresponding to a non-extensive Tsallis statistics is able to describe the distribution of amplitude of earthquakes, pre-seismic kHz EM emissions (electromagnetic earthquakes), solar flares, and magnetic storms. The

  2. Experience with an anonymous web-based state EMS safety incident reporting system.

    Science.gov (United States)

    Gallagher, John M; Kupas, Douglas F

    2012-01-01

    Patient and provider safety is paramount in all aspects of emergency medical services (EMS) systems. The leaders, administrators, and policymakers of these systems must have an understanding of situations that present potential for harm to patients or providers. This study analyzed reports to a statewide EMS safety event reporting system with the purpose of categorizing the types of incidents reported and identifying opportunities to prevent future safety events. This statewide EMS safety incident reporting system is a Web-based system to which any individual can anonymously report any event or situation perceived to impact safety. We reviewed all reports between the system's inception in 2003 through August 2010. A stipulation of the system is that any entry containing information that identifies an EMS provider, agency, or patient will be deleted and thus not included in the analysis. Each event report included the description of the event, the relationship of the reporter, and the year in which the event occurred. Each entry was placed into a category that best represents the situation described. A total of 415 reports were received during the study period, and 186 reports were excluded-163 (39%) excluded by the state because of identifiable information and 23 (6%) excluded by the authors because of nonsensical description. Within the remaining 229 reports, there were 237 distinct safety events. These events were classified as actions/behavior (32%), vehicle/transportation (16%), staffing or ambulance availability (13%), communications (8%), medical equipment (9%), multiple patients/agencies/units and level-of-care issues (7%), medical procedure (6%), medication (5%), accident scene management/scene safety (3%), and protocol issues (1%). EMS providers directly involved in the event represented the largest reporting group (33%). We also provide examples of statewide system and policy changes that were made in direct response to these reports. This EMS safety

  3. Reference Gene Selection in the Desert Plant <em>Eremosparton songoricuem>m>

    Directory of Open Access Journals (Sweden)

    Dao-Yuan Zhang

    2012-06-01

    Full Text Available <em>Eremosparton songoricum em>(Litv. Vass. (<em>E. songoricumem> is a rare and extremely drought-tolerant desert plant that holds promise as a model organism for the identification of genes associated with water deficit stress. Here, we cloned and evaluated the expression of eight candidate reference genes using quantitative real-time reverse transcriptase polymerase chain reactions. The expression of these candidate reference genes was analyzed in a diverse set of 20 samples including various <em>E. songoricumem> plant tissues exposed to multiple environmental stresses. GeNorm analysis indicated that expression stability varied between the reference genes in the different experimental conditions, but the two most stable reference genes were sufficient for normalization in most conditions.<em> EsEFem> and <em>Esα-TUB> were sufficient for various stress conditions, <em>EsEF> and <em>EsACT> were suitable for samples of differing germination stages, and <em>EsGAPDH>and <em>Es>UBQ em>were most stable across multiple adult tissue samples. The <em>Es18Sem> gene was unsuitable as a reference gene in our analysis. In addition, the expression level of the drought-stress related transcription factor <em>EsDREB2em>> em>verified the utility of<em> E. songoricumem> reference genes and indicated that no single gene was adequate for normalization on its own. This is the first systematic report on the selection of reference genes in <em>E. songoricumem>, and these data will facilitate future work on gene expression in this species.

  4. A novel two-component system found in <em>Mycobacterium tuberculosisem>

    DEFF Research Database (Denmark)

    Morth, J. P.; Gosmann, S.; Nowak, E.;

    2005-01-01

    We report the identification of a novel two-component system in Mycobacterium tuberculosis. We show that the putative histidine kinase with the genomic locus tag Rv3220c is able to self-phosphorylate in the presence of Mg2+/ATP and subsequently transfer the phosphoryl group to a novel response...

  5. System of systems modeling and analysis.

    Energy Technology Data Exchange (ETDEWEB)

    Campbell, James E.; Anderson, Dennis James; Longsine, Dennis E. (Intera, Inc., Austin, TX); Shirah, Donald N.

    2005-01-01

    This report documents the results of an LDRD program entitled 'System of Systems Modeling and Analysis' that was conducted during FY 2003 and FY 2004. Systems that themselves consist of multiple systems (referred to here as System of Systems or SoS) introduce a level of complexity to systems performance analysis and optimization that is not readily addressable by existing capabilities. The objective of the 'System of Systems Modeling and Analysis' project was to develop an integrated modeling and simulation environment that addresses the complex SoS modeling and analysis needs. The approach to meeting this objective involved two key efforts. First, a static analysis approach, called state modeling, has been developed that is useful for analyzing the average performance of systems over defined use conditions. The state modeling capability supports analysis and optimization of multiple systems and multiple performance measures or measures of effectiveness. The second effort involves time simulation which represents every system in the simulation using an encapsulated state model (State Model Object or SMO). The time simulation can analyze any number of systems including cross-platform dependencies and a detailed treatment of the logistics required to support the systems in a defined mission.

  6. Reproducible infection model for <em>Clostridium perfringensem> in broiler chickens

    DEFF Research Database (Denmark)

    Pedersen, Karl; Friis-Holm, Lotte Bjerrum; Heuer, Ole Eske

    2008-01-01

    Experiments were carried out to establish an infection and disease model for Clostridium perfringens in broiler chickens. Previous experiments had failed to induce disease and only a transient colonization with challenge strains had been obtained. In the present study, two series of experiments w...

  7. Influence of Amitraz and Oxalic Acid on the Cuticle Proteolytic System of <em>Apis melliferaem> L. Workers

    Directory of Open Access Journals (Sweden)

    Grzegorz Borsuk

    2012-08-01

    Full Text Available This work verifies that amitraz and oxalic acid treatment affect honeybee cuticle <em>proteolytic enzymes (CPE.em> Three bee groups were monitored: oxalic acid treatment, amitraz treatment, control. Electrophoresis of hydrophilic and hydrophobic CPE was performed. Protease and protease inhibitor activities (<em>in vitroem> and antifungal/antibacterial efficiencies (<em>in vivoem>, were analyzed. Amitraz and oxalic acid treatment reduced hydrophobic, but did not affect hydrophilic, protein concentrations and reduced both hydrophilic and hydrophobic body surface asparagine and serine protease activities in relation to most substrates and independently of pH. The activities of natural cuticle inhibitors of acidic, neutral, and alkaline proteases were suppressed as a result of the treatments, corresponding with reduced antifungal and antibacterial activity. Electrophoretic patterns of low-, medium-, and high-molecular-weight proteases and protease inhibitors were also affected by the treatments.

  8. A ring test of a wireless <em>in vitroem> gas production system

    DEFF Research Database (Denmark)

    Cornou, Cecile; Storm, Ida Marie Lindhardt Drejer; Hindrichsen, Ida Katarina Auf der M.

    2013-01-01

    ) or sheep (SP). Curves, corrected for blanks, were fitted using an exponential regression model with a lag time. The following variables were considered: (i) GP24 and GP48: raw values at 24 and 48 h (mL/g DM), corrected for blanks; (ii) A: asymptotic GP (mL/g DM); (iii) T1/2: time when half A is produced (h...

  9. New experimental model for training in videosurgery Novo modelo experimental para treinamento em videocirurgia

    Directory of Open Access Journals (Sweden)

    Danilo Malta Batista

    2012-10-01

    Full Text Available PURPOSE: To develop a new experimental model of lower cost for training in videosurgery. METHODS: This project was performed at the Nucleus of Experimental Surgery of the Bahiana School of Medicine and Public Health, based on previous models described in the literature and under the supervision of the full professor of Operative Technique and Experimental Surgery II. It was made a model cube-shaped, made of wood, with holes distributed in various locations, rubber stoppers for the holes and lined externally with carpet, and internally with laminate. RESULTS: The new experimental model is of low cost and reproduces quite faithfully several videosurgical procedures. CONCLUSION: Medical schools interested in the subject may adopt the new model for training in videosurgery without the need of high costs for making and using these models.OBJETIVO: Desenvolver um novo modelo experimental de baixo custo para treinamento em videocirurgia MÉTODOS: Este projeto foi conduzido no Núcleo de Cirurgia Experimental da Escola Bahiana de Medicina e Saúde Pública, baseado em modelos prévios descritos na literatura e sob a supervisão do professor titular de Técnica Operatória e Cirurgia Experimental II. Foi feito um modelo em formato de cubo, de madeira, com furos distribuídos em vários locais, tampas de borracha para os orifícios e forrado externamente com carpete e internamente com laminado. RESULTADOS: O novo modelo experimental desenvolvido é de baixo custo e reproduz de forma bastante fiel diversos procedimentos videocirúrgicos. CONCLUSÃO: Faculdades médicas interessadas no tema poderão adotar o novo modelo para o treinamento em videocirurgia sem que sejam necessários gastos elevados para a confecção e o uso desses modelos.

  10. Application of modelling tecniques to manage a population of grey squirrels (<em>Sciurus carolinensisem> in Lombardy, northern Italy, and analysis of parameters estimates used in simulations

    Directory of Open Access Journals (Sweden)

    Clara Tattoni

    2006-03-01

    Full Text Available Abstract Grey squirrel (<em>Sciurus carolinensisem>, an invasive alien species, is currently replacing the native Eurasian red squirrel (Sciurus vulgaris in British Isles and north-west Italy. Grey squirrel has recently been reported in the Ticino Park (Lombardy region, NW Italy and the species is likely to spread in the woodlands connecting Italy to other European countries. We used GRASS Geographical Information System (GIS and Spatially Explicit Population Dynamics Models (SEPM as a conservation tool to predict the spread of grey squirrels and to test different management options in the Ticino Regional Park and surrounding areas in a 40 years time frame. The integrated approach of SEPM and GIS allowed us to suggest public administration a cost effective action plan to stop the invasion process. We also analyse the parameters used in the model highlighting some missing data in literature: we can address future field study with the aim to improve model performance. Riassunto Modelli per la gestione di una popolazione di Scoiattolo grigio (<em>Sciurus carolinensisem> in Lombardia e stima dei parametri usati nelle simulazioni. La sostituzione da parte dello Scoiattolo grigio (<em>Sciurus carolinensisem>, specie alloctona e invasiva, dello Scoiattolo rosso (<em>Sciurus vulgarisem>, specie autoctona Europea, é attualmente in corso nelle Isole Britanniche e nell’Italia nord occidentale. Lo Scoiattolo grigio é stato recentemente segnalato nel Parco Lombardo della Valle del Ticino (Italia nord occidentale ed é probabile che si diffonda nelle foreste che connettono l’Italia agli altri paesi europei. In questo lavoro il Sistema Informativo Geografico GRASS e i modelli denominati Spatially Explicit Population Dynamics Models sono stati usati come strumento per prevedere la diffusione dello Scoiattolo grigio e per verificare differenti opzioni gestionali all’interno del Parco del

  11. Solar drying system for tropical fruits and a model for drying bananas in a static column dryer; Sistema de secagem solar para frutos tropicais e modelagem da secagem de banana em um secador de coluna estatica

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Antonio Raimundo da Silva

    2008-01-15

    An electric solar dryer consisting of a solar collector, a drying chamber, an exhaust fan and a fan to promote forced hot air convection were projected, built and tested . Banana drying experiments were also carried out in a static column dryer to model the drying and to obtain parameters that can be used as a first approximation in the modeling of an electric solar dryer, depending on the similarity of the experimental conditions between the two drying systems. From the banana drying experiments conducted in the static column dryer, we obtained food weight data as a function of aqueous concentration and temperature. Simplified mathematical models of the banana drying were made, based on Fick's and Fourier's second equations, which were tested with the experimental data. We determined and/or modeled parameters such as banana moisture content, density, thin layer drying curves, equilibrium moisture content, molecular diffusivity of the water in banana D{sub AB}, extemal mass transfer coefficient k{sub M}, specific heat C{sub p}, thermal conductivity k, latent heat of water evaporation in the food L{sub food}, time to heat food, and minimum energy and power required to heat the food and evaporate the water. When we considered the shrinkage of radius R of a banana, the calculated values of D{sub AB} and k{sub M} generally better represent the phenomenon of water diffusion in a solid. The latent heat of water evaporation in the food L{sub food} calculated by modeling is higher than the latent heat of pure water evaporation L{sub water}. The values calculated for D{sub AB} and K{sub M} that best represent the drying were obtained with the analytical model of the present paper. These values had good agreement with those assessed with a numeric model described in the literature, in which convective boundary condition and food shrinkage are considered. Using parameters such as C{sub p}, D{sub AB}, k, k{sub M} and L{sub food}, one can elaborate the preliminary

  12. Use of the sensitivity analysis for multi-attributes decision models for oil exploration and production systems; Uso da analise de sensibilidade em modelos de decisao multiatributos para sistemas de exploracao e producao de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Furtado, Ricardo

    2000-07-01

    Today, oil companies must be able to survive in a hostile and competitive environment. Such environment involves volatility of oil prices, the narrow margins of profitability, and ever increasing environmental restrictions. In order to survive, firms must have the appropriate tools to consider the tradeoffs involving the financial, environmental, technological and of market parameters which are the key elements within the investment decision-making process. The aim of the present work is to analyze the behavior of the weights (relative importance) of the attributes int the multi-criteria decision model through a high dimension sensitivity analysis. Among the benefits of such method are: provide the analyst (decision-maker) with a better characterization and control of the weights of the attributes, providing the user with a clear view of the entire decision process. The methodology suggested in this dissertation was applied in two oil exploration and production case studies. The first case involved the selection of an exploratory target among three options. In this case, there is interaction of the objectives of the company, where financial, technological and of market parameters interact. In the second case, a hypothetical production project is suggested. For this second study, the decision-maker has the option of using one of the following production systems: a FPSO (Floating, Production, Storage and Offloading); a TLP (Tension Leg Platform); or a SS (Semi Submersible). The attributes for each one of the production systems are financial, technological and environmental. In this second case, the model makes it possible to simulate several options, providing the manager with the choice of the most appropriate production system to this objectives and preferences. (author)

  13. A porcine model of acute, haematogenous, localized osteomyelitis due to <em> Staphylococcus aureusem>

    DEFF Research Database (Denmark)

    Johansen, Louise Kruse; Frees, Dorte; Aalbæk, Bent;

    2011-01-01

    A porcine model of acute, haematogenous, localized osteomyelitis was established. Serial dilutions of Staphylococcus aureus [5–50–500–5000–50 000 CFU/kg body weight (BW) suspended in saline or saline alone] were inoculated into the right brachial artery of pigs (BW 15 kg) separated into six groups...... of two animals. During the infection, blood was collected for cultivation, and after the animals were killed from day 5 to 15, they were necropsied and tissues were sampled for histopathology. Animals receiving =500 CFU/kg BW were free of lesions. Pigs inoculated with 5000 and 50 000 CFU/kg BW only...

  14. Systemic BCG immunization induces persistent lung mucosal multifunctional CD4 T(EM cells which expand following virulent mycobacterial challenge.

    Directory of Open Access Journals (Sweden)

    Daryan A Kaveh

    Full Text Available To more closely understand the mechanisms of how BCG vaccination confers immunity would help to rationally design improved tuberculosis vaccines that are urgently required. Given the established central role of CD4 T cells in BCG induced immunity, we sought to characterise the generation of memory CD4 T cell responses to BCG vaccination and M. bovis infection in a murine challenge model. We demonstrate that a single systemic BCG vaccination induces distinct systemic and mucosal populations of T effector memory (T(EM cells in vaccinated mice. These CD4+CD44(hiCD62L(loCD27⁻ T cells concomitantly produce IFN-γ and TNF-α, or IFN-γ, IL-2 and TNF-α and have a higher cytokine median fluorescence intensity MFI or 'quality of response' than single cytokine producing cells. These cells are maintained for long periods (>16 months in BCG protected mice, maintaining a vaccine-specific functionality. Following virulent mycobacterial challenge, these cells underwent significant expansion in the lungs and are, therefore, strongly associated with protection against M. bovis challenge. Our data demonstrate that a persistent mucosal population of T(EM cells can be induced by parenteral immunization, a feature only previously associated with mucosal immunization routes; and that these multifunctional T(EM cells are strongly associated with protection. We propose that these cells mediate protective immunity, and that vaccines designed to increase the number of relevant antigen-specific T(EM in the lung may represent a new generation of TB vaccines.

  15. Resilience analysis for agricultural systems of north China plain based on a dynamic system model Análise de elasticidade para sistemas agrícolas da planície do norte da China baseada em um modelo dinâmico de sistema

    Directory of Open Access Journals (Sweden)

    Hongjun Li

    2011-02-01

    Full Text Available This paper presents a case study of resilience theory to understand agricultural systems in the Luancheng County of the North China Plain. A dynanic system model coupled with social, economic and ecological subsystems of agriculture for the Luancheng County was constructed with a time step of one month. The model includes five main components, water resources, profitability, irrigation, crop yield and area. The simulated groundwater table, wheat area and yield, maize area and yield, and rural labor transfer reflected the general trend of the observed data, with calculated determination coefficients higher than 0.88. Resilience of agricultural systems, as indicated by agricultural profitability and food security, were explored for the Luancheng County. Initially, investments in agriculture increased its resilience rapidly. However, with the degradation of resources and the increases in agricultural investment, the cost of agricultural production became too high to gain profit. The rise in population increases the risk of food security. As a result, the resilience of agricultural systems decreased gradually. The Luancheng County is now in the conservation phase of the adaptive cycle. Partial adjustments should be introduced to enhance its resilience and promote the continuing development of the agricultural systems.Este trabalho se refere a um estudo de caso da teoria de elasticidade para entender sistemas agrícolas na província de Luancheng na planície do norte da China. Foi construído um modelo de sistema dinâmico acoplado a subsistemas agrícolas sociais, econômicos e ecológicos para a província de Luancheng com um intervalo de tempo de um mês. O modelo inclui cinco componentes principais: recursos hídricos, rentabilidade, irrigação, produção agrícola e área. O lençol freático simulado, a área e a produção de trigo, a área e produção de milho e a transferência de mão de obra refletiram a tendência geral dos resultados

  16. Spatially explicit <em>Schistosoma> infection risk in eastern Africa using Bayesian geostatistical modelling

    DEFF Research Database (Denmark)

    Schur, Nadine; Hürlimann, Eveline; Stensgaard, Anna-Sofie

    2013-01-01

    Schistosomiasis remains one of the most prevalent parasitic diseases in the tropics and subtropics, but current statistics are outdated due to demographic and ecological transformations and ongoing control efforts. Reliable risk estimates are important to plan and evaluate interventions in a spat......Schistosomiasis remains one of the most prevalent parasitic diseases in the tropics and subtropics, but current statistics are outdated due to demographic and ecological transformations and ongoing control efforts. Reliable risk estimates are important to plan and evaluate interventions...... in a spatially explicit and cost-effective manner. We analysed a large ensemble of georeferenced survey data derived from an open-access neglected tropical diseases database to create smooth empirical prevalence maps for Schistosoma mansoni and Schistosoma haematobium for a total of 13 countries of eastern...... Africa. Bayesian geostatistical models based on climatic and other environmental data were used to account for potential spatial clustering in spatially structured exposures. Geostatistical variable selection was employed to reduce the set of covariates. Alignment factors were implemented to combine...

  17. Modelling Inverse Gaussian Data with Censored Response Values: EM versus MCMC

    Directory of Open Access Journals (Sweden)

    R. S. Sparks

    2011-01-01

    Full Text Available Low detection limits are common in measure environmental variables. Building models using data containing low or high detection limits without adjusting for the censoring produces biased models. This paper offers approaches to estimate an inverse Gaussian distribution when some of the data used are censored because of low or high detection limits. Adjustments for the censoring can be made if there is between 2% and 20% censoring using either the EM algorithm or MCMC. This paper compares these approaches.

  18. Advanced EMS and its trial operation in Shanghai power system

    Institute of Scientific and Technical Information of China (English)

    LU Qiang; HE GuangYu; MEI ShengWei; SUN YingYun; RUAN QianTu; WANG Wei; ZHANG WangJun; YU XuFeng

    2008-01-01

    To meet the demand of high stability, high quality, and low losses of power systems, the advanced energy management system (AEMS) is established and revealed in this bulletin, which has been put into trial operation in Shanghai power system for almost half a year. The AEMS is novel from all aspects covering idea, theory, method, software, and engineering. The essence of AEMS is exercising the hybrid automatic control theory and technology to realize multi-objective optimal closedloop control of power systems. Based on an "event-driven" strategy, the AEMS transforms multi-objective optimal control problems into event identification and elimination by defining the unsatisfactory states of a power system as events. This bulletin concisely presents the theory and main advantages of AEMS, as well as its implementation in Shanghai power system.

  19. Advanced EMS and its trial operation in Shanghai power system

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    To meet the demand of high stability,high quality,and low losses of power systems,the advanced energy management system (AEMS) is established and revealed in this bulletin,which has been put into trial operation in Shanghai power system for almost half a year. The AEMS is novel from all aspects covering idea,theory,method,software,and engineering. The essence of AEMS is exercising the hybrid automatic control theory and technology to realize multi-objective optimal closed-loop control of power systems. Based on an "event-driven" strategy,the AEMS transforms multi-objective optimal control problems into event identification and elimination by defining the unsatisfactory states of a power system as events. This bulletin concisely presents the theory and main advantages of AEMS,as well as its implementation in Shanghai power system.

  20. Integrated systemic model in the management of stocks and purchases in the administration of results: the financial challenge in the re-stocking Modelo sistêmico integrado em gestão de estoques e compras na administração de resultado: o desafio financeiro no ressuprimento

    Directory of Open Access Journals (Sweden)

    Mauricio Kalau Gonzáles

    2006-11-01

    Full Text Available When purchases are carried out in the company, it is not only to replace the stock. It is also possible to obtain several financial advantages for the company, to what the working capital management is concerned. However, in order to make it happen positively, the company must have a policy of such an understanding and a decisive system which guides the entrepreneur. It is proposed in this work the creation of such a model of decision. In the literary review about this subject, several conflicting points were explained because it dealt with not only purchases but also related interdepartmental aspects. Besides, purchases simulations were performed in order to verify the applicability of formulas such as those of the purchases made in advance as well as to demonstrate the advantages and disadvantages of speculation. By means of the scientific survey herein formulated, it is possible to observe in balance sheets that were published, the different stocking strategies of the companies in periods of financial uncertainty, confronted with periods of monetary stability in Brazil and the results obtained. As a result to the application of the t test to the student in two samples, it was observed that, in periods of high inflation, the companies in general stocked more, invested less in available resources (cash and banks, and obtained more profit than in periods of low inflation, probably because the financial market offered more advantages. It was recommended that the companies, as they update their system due to the new perspectives of the market, review their model of stocks and production management, fostering the establishment of favorable conditions so that all the related production chain (SCM can be administered in a participatory way.Uma série de vantagens financeiras para a empresa no contexto da administração do capital de giro. Porém, para que isto possa acontecer de forma positiva, há de existir uma política da empresa com esta vis

  1. Accurate model annotation of a near-atomic resolution cryo-EM map.

    Science.gov (United States)

    Hryc, Corey F; Chen, Dong-Hua; Afonine, Pavel V; Jakana, Joanita; Wang, Zhao; Haase-Pettingell, Cameron; Jiang, Wen; Adams, Paul D; King, Jonathan A; Schmid, Michael F; Chiu, Wah

    2017-03-21

    Electron cryomicroscopy (cryo-EM) has been used to determine the atomic coordinates (models) from density maps of biological assemblies. These models can be assessed by their overall fit to the experimental data and stereochemical information. However, these models do not annotate the actual density values of the atoms nor their positional uncertainty. Here, we introduce a computational procedure to derive an atomic model from a cryo-EM map with annotated metadata. The accuracy of such a model is validated by a faithful replication of the experimental cryo-EM map computed using the coordinates and associated metadata. The functional interpretation of any structural features in the model and its utilization for future studies can be made in the context of its measure of uncertainty. We applied this protocol to the 3.3-Å map of the mature P22 bacteriophage capsid, a large and complex macromolecular assembly. With this protocol, we identify and annotate previously undescribed molecular interactions between capsid subunits that are crucial to maintain stability in the absence of cementing proteins or cross-linking, as occur in other bacteriophages.

  2. A high-throughput qPCR system for simultaneous quantitative detection of dairy <em>Lactococcus lactisem> and <em>Leuconostoc> bacteriophages

    DEFF Research Database (Denmark)

    Muhammed, Musemma Kedir; Krych, Lukasz; Nielsen, Dennis Sandris

    2017-01-01

    Simultaneous quantitative detection of Lactococcus (Lc.) lactis and Leuconostoc species bacteriophages (phages) has not been reported in dairies using undefined mixed-strain DL-starters, probably due to the lack of applicable methods. We optimized a high-throughput qPCR system that allows...... simultaneous quantitative detection of Lc. lactis 936 (now SK1virus), P335, c2 (now C2virus) and Leuconostoc phage groups. Component assays are designed to have high efficiencies and nearly the same dynamic detection ranges, i.e., from 1.1 x 105 to 1.1 x 101 phage genomes per reaction, which corresponds to 9 x...

  3. ECO-BIOLOGICAL SYSTEM MODELING

    Directory of Open Access Journals (Sweden)

    T. I. Burak

    2015-01-01

    Full Text Available The methodology for computer modeling of complex eco-biological models is presented in this paper. It is based on system approach of J. Forrester. Developed methodology is universal for complex ecological and biological systems. Modeling algorithm considers specialties of eco-biological systems and shows adequate and accurate results in practice. 

  4. Characterization of the interaction between the human pathogen <em>Listeria monocytogenesem> and the model host <em>C. elegansem>

    DEFF Research Database (Denmark)

    Simonsen, Karina Trankjær; Nielsen, Jesper Sejrup; Thomsen, Line E.

    In nature, C. elegans lives in the soil and feeds on bacteria. This constant contact with soil-borne microbes suggests that nematodes must have evolved protective responses against pathogens which makes the worm an attractive host-pathogen model for exploring their innate immune response. In addi...... Microbiol 10, 10-16. [2]: Styer, K. L., et al (2005) EMBO Rep 6, 992-997. [3]: Anyanful, A., et al (2005) Mol Microbiol 57, 988-1007. [4]: Sifri, C. D., et al (2003) Infect Immun 71, 2208-2217. [5]: Thomsen, L. E., et al (2006) Appl Environ Microbiol 72, 1700-1701....

  5. Modeling the effect of direct and indirect contamination of on-farm bulk tank milk with <em>Mycobacterium aviumem> subsp. <em>paratuberculosis>

    DEFF Research Database (Denmark)

    Okura, Hisako; Nielsen, Søren Saxmose; Toft, Nils

    2013-01-01

    Mycobacterium avium subsp. paratuberculosis (MAP) in milk of bovine origin is suspected of being implicated in Crohn's disease in humans. Milk can be contaminated via direct excretion of MAP in milk or indirectly via fecal contamination of the milk. This study aimed at estimating the level of MAP...... milk from test positive cows would result in discarding 11% of milk and reduce the MAP level by 80%. Due to poor sensitivity of the diagnostic test, removing test-positive cows would not further reduce the already low concentration of MAP and it would not guarantee the milk as MAP-free. The model...

  6. Immunocytochemistry of the Neuromuscular Systems of <em>Loxosomella viviparaem> and <em>L. parguerensisem> (Entoprocta: Loxosomatidae)

    DEFF Research Database (Denmark)

    Fuchs, Judith; Bright, Monika; Funch, Peter

    2006-01-01

    Little detailed information exists on the anatomy of the nervous system and the musculature of Entoprocta. Herein we describe the distribution of the neurotransmitters RFamide and serotonin as well as the myo-anatomy of adults and asexually produced budding stages of the solitary entoproct species...... of oral nerves that innervate two pairs of nerve cell clusters in the heel of the foot, a pair of aboral nerves, the paired lateral nerves, the calyx nerves, the atrial ring nerve, the tentacle nerves, the stomach nerves, and the rectal nerves. Serotonin is only found in the cerebral ganglion, the oral....... We found several circular muscles in the calyx. The stalk and parts of the foot and the calyx are surrounded by a fine outer layer of ring muscles. In addition to the congruent details regarding the myo-anatomy of both species, species-specific muscle structures could be revealed. The comparison...

  7. Um modelo baseado em programação linear e programação de metas para análise de um sistema de produção e distribuição de suco concentrado congelado de laranja A model based on linear programming and goal programming to analyze a frozen concentrated orange juice production and distribution system

    Directory of Open Access Journals (Sweden)

    José Renato Munhoz

    2001-08-01

    Full Text Available Neste trabalho apresenta-se um modelo baseado em programação linear e programação de metas para apoiar decisões no processo de mistura e na distribuição de suco concentrado congelado de laranja. Explora-se a importância das decisões do processo de mistura para a análise da logística de distribuição do suco de laranja, além das decisões de transporte e armazenagem. O modelo utiliza conceitos conhecidos da literatura de problemas de mistura e planejamento da produção com múltiplos produtos, estágios e períodos, e foi resolvido por meio da linguagem de modelagem GAMS (General Algebraic Modeling System. Um estudo de caso foi realizado numa empresa de suco de laranja localizada no interior do estado de São Paulo, e os resultados preliminares obtidos são promissores.This work proposes a model based on linear programming and goal programming to support decisions in the blending process and distribution of frozen concentrated orange juice. This study explores the importance of blending decisions for the logistic analysis of the orange juice distribution, besides transportation and storage decisions. The model utilizes well-known concepts from the literature of blending problems and multistage, multiproduct and multiperiod production planning problems, and it was solved using the GAMS (General Algebraic Modeling System programming language. A case study was developed in an orange juice industry located in São Paulo State, and the preliminary results are promising.

  8. System em um operador logístico (3PL

    Directory of Open Access Journals (Sweden)

    Douglas Ribeiro Novaes

    2016-11-01

    Full Text Available With the constant technological advancement, the companies started to invest in new systems to support competitiveness in the market in which they operate. This article aims to describe the process of deployment of the technology Warehouse Management System. The tool known as WMS is a system that facilitates the handling operations and storage materials through defined parameters, but the deployment of this system need to go through steps that impact positively and negatively the company's various sectors. This study was developed because of the existence of questions related to the development of the implementation of project presenting departments and professionals involved in the process and due to the need to clarify doubts about the usefulness of system. This document was based on specific literature and complemented by a case study on the company Julio Simoes Logística S / A through an interview with the organization's representative. In order to logistics operator perform their daily activities as receipt, storage and dispatch efficiently it is necessary  a technology that provides accurate and reliable data,  and that make available information that allows the company, to improve its operations.

  9. Feo-hifomicose sistêmica em cão Systemic phaeohyphomycosis in a dog

    Directory of Open Access Journals (Sweden)

    Iana Carolina Pordeus Uchôa

    2012-04-01

    Full Text Available Descrevem-se os achados clínicos, laboratoriais e histopatológicos de feo-hifomicose sistêmica em um cão. Clinicamente observou-se cansaço, ascite, apatia, hiporexia, perda de peso e polidipsia. O animal estava sendo tratado para erliquiose e babesiose. Após 11 dias, o cão retornou com hepatopatia grave e veio a óbito em 48 horas. Na necropsia, observaram-se nódulos enegrecidos em vários órgãos da cavidade abdominal. Histologicamente, havia reação granulomatosa necrosante com hemorragia, associada a miríades de hifas fúngicas pigmentadas intralesionais em múltiplos órgãos, caracterizando feo-hifomicose sistêmica. Ressalta-se a importância de incluir esta doença no diagnóstico diferencial de hepatopatias graves em cães com ascite.The objective of this study was to describe clinical, laboratorial and histopathological findings of systemic phaeohyphomycosis in a dog. The animal was presented with a history of fatigue, ascites, lethargy, weight and appetite loss and polydipsia. The therapy for erliquiose and babesiosis was started. After 11 days, the dog returned with severe liver disease and died after forty-eight hours. At necropsy, there were black nodules in various abdominal organs. Histologically, necrotizing granulomatous reaction with hemorrhage associated with myriads of intralesional pigmented fungal hyphae was observed in multiple organs, characterizing systemic phaeohyphomycosis. Thus, it is important to include this illness in the differential diagnosis of severe liver diseases in dogs with ascites.

  10. Mathematical System Theory and System Modeling

    OpenAIRE

    1980-01-01

    Choosing models related effectively to the questions to be addressed is a central issue in the craft of systems analysis. Since the mathematical description the analyst chooses constrains the types of issues he candeal with, it is important for these models to be selected so as to yield limitations that are acceptable in view of the questions the systems analysis seeks to answer. In this paper, the author gives an overview of the central issues affecting the question of model choice. To ...

  11. Seismic modeling in complex media; Modelagem sismica em meios complexos

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Eldues Oliveira [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Lab. de Metodos Computacionais em Engenharia (LAMCE)]. E-mail: eldues@lamce.ufrj.br; Soares Filho, Djalma M. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas]. E-mail: djalma@cenpes.petrobras.com.br

    2003-07-01

    This work was divided in two phases: first we perform simulations in a realistic onshore model that has the presence of a thick shale layer (approx 1 km) above of a gas deposit, faults plane, vertical interfaces and relief of irregular topography. We esteem the wave-field complexity in a model with typical geology sub-Andean. In this case we applied TIV scheme. Second we simulate an offshore model that presents interfaces with high seismic impedance due to the presence of salt domes. In both simulations we compare seismograms obtained using isotropic and anisotropic layers. These comparisons show as the use of traditional tools (i.e., acoustic and isotropic) can be negligent in highly complex areas. (author)

  12. Importance of awareness in improving performance of emergency medical services (EMS) systems in enhancing traffic safety: A lesson from India.

    Science.gov (United States)

    Vasudevan, Vinod; Singh, Preeti; Basu, Samyajit

    2016-10-02

    India has been slow in implementing a central emergency medical services (EMS) system across the country. "108 services" is one of the most popular services that is functional under the public-private partnership model. Limited available literature shows that despite access to services, many traffic crash victims are transported using private vehicles. The objective of this study is to understand the effectiveness of 108 services from a traffic safety perspective. A questionnaire survey is conducted to understand the awareness of EMS and their function. Using traffic-related fatalities as the dependent variable, a fixed effect panel data model is developed to analyze the effectiveness of the 108 services in improving the traffic safety. The results from the survey show that, in general, people are not aware of the 108 services. A majority of the population prefers taking victims to the hospital using their personal vehicles or any other vehicles available compared to calling an ambulance. Results from panel data analysis show that despite having an efficient system, these services failed to make significant improvement in the safety of road users in the states in which their services were subscribed. The lack of awareness of an important safety service is alarming. This could be a major reason for lower utilization of 108 services for transporting victims of traffic crashes. This article shows the importance of having efficient awareness campaigns to improve the efficiency of any similar programs that are aimed to enhance the safety of a region.

  13. Developing an analytical tool for evaluating EMS system design changes and their impact on cardiac arrest outcomes: combining geographic information systems with register data on survival rates

    Directory of Open Access Journals (Sweden)

    Sund Björn

    2013-02-01

    Full Text Available Abstract Background Out-of-hospital cardiac arrest (OHCA is a frequent and acute medical condition that requires immediate care. We estimate survival rates from OHCA in the area of Stockholm, through developing an analytical tool for evaluating Emergency Medical Services (EMS system design changes. The study also is an attempt to validate the proposed model used to generate the outcome measures for the study. Methods and results This was done by combining a geographic information systems (GIS simulation of driving times with register data on survival rates. The emergency resources comprised ambulance alone and ambulance plus fire services. The simulation model predicted a baseline survival rate of 3.9 per cent, and reducing the ambulance response time by one minute increased survival to 4.6 per cent. Adding the fire services as first responders (dual dispatch increased survival to 6.2 per cent from the baseline level. The model predictions were validated using empirical data. Conclusion We have presented an analytical tool that easily can be generalized to other regions or countries. The model can be used to predict outcomes of cardiac arrest prior to investment in EMS design changes that affect the alarm process, e.g. (1 static changes such as trimming the emergency call handling time or (2 dynamic changes such as location of emergency resources or which resources should carry a defibrillator.

  14. Teor de nitrato em alface cultivada em sistemas hidropônico e convencional Level of nitrate in lettuce cultivated in hydroponic and conventional systems

    Directory of Open Access Journals (Sweden)

    Elisabete R. Yonamini Beninni

    2002-06-01

    Full Text Available O monitoramento do teor de nitrato nos alimentos é importante, uma vez que poderão ser formados compostos prejudiciais à saúde humana e animal após sua ingestão. Com o objetivo de avaliar o teor de nitrato presente em alface, foram coletadas e analisadas as folhas de alface crespa comercializada no Município de Londrina, cultivada em sistemas hidropônico e convencional. Os valores encontrados variaram entre 26 e 2.568 mg.kg-1 de peso fresco, sendo que as plantas cultivadas em sistema hidropônico apresentaram teores superiores em relação às cultivadas em sistema convencional, porém abaixo do limite máximo de nitrato permitido para alface, na Europa.The control of the nitrate level in foods is important because this substance may be harmful to human and animal health. The aim of this work was to evaluate nitrate levels in lettuce produced in hydroponic and conventional systems and commercialized in Londrina, Brazil. The nitrate concentration ranged from 26 to 2,568 mg.kg-1 fresh weight. Hydroponic lettuce showed higher levels of nitrate but in all cases the level of nitrate was lower than the maximum allowed by the Comission of the European Communities.

  15. Rheological behavior and color stability of anthocyanins from Merlot (Vitis vinifera L. and Bordô (Vitis labrusca L. grapes in a jam model system Comportamento reológico e estabilidade de antocianinas de uvas Merlot (Vitis vinifera L. e Bordô (Vitis labrusca L. em sistema modelo de geléia

    Directory of Open Access Journals (Sweden)

    Ana Paula Falcão

    2009-12-01

    Full Text Available Anthocyanins are the pigments responsible for the color of most red grapes and are easily degraded following various reaction mechanisms affected by oxygen, enzymes, pH, and temperature among other variables. In this study, a jam model system was developed using Merlot and Bordô grape extracts and polysaccharides (xanthan and locust bean gums and different temperatures (45, 55 and 65 °C. The stability of the anthocyanin pigments and the rheological behavior of the jam model system were studied. For the determination of the stability, the half-life time and first-order reaction rate constants for the anthocyanin pigments were calculated. The rheological behavior was determined through the Power law model. The jam model system produced using a temperature of 45 °C showed the best results for the anthocyanin half-life time. The first-order reaction rate constants for the 45, 55, and 65 °C treatments were not significantly different among each other (p > 0.05. It was observed that with an increase in the jam model system temperature there was an increase in the index of consistency.As antocianinas, pigmentos responsáveis pela cor vermelha das uvas, são facilmente degradadas por vários mecanismos de reação, através da ação do oxigênio, enzimas, pH e temperatura, entre outras variáveis. Neste trabalho, um sistema modelo de geleia foi desenvolvido utilizando extrato de uva das variedades Bordô e Merlot e polissacarídeos (gomas xantana e locusta em diferentes temperaturas (45, 55 e 65 °C. A estabilidade dos pigmentos antociânicos e o comportamento reológico foram estudados. Para a determinação da estabilidade, calculou-se o tempo de meia-vida (t½ e a constante velocidade de reação (primeira ordem (k. Para o comportamento reológico, as constantes foram determinadas utilizando-se o modelo matemático Power law. O sistema modelo desenvolvido que utiliza a temperatura de 45 °C mostrou os melhores resultados para o t½ das

  16. Performance of GeantV EM Physics Models

    Energy Technology Data Exchange (ETDEWEB)

    Amadio, G.; et al.

    2016-10-14

    The recent progress in parallel hardware architectures with deeper vector pipelines or many-cores technologies brings opportunities for HEP experiments to take advantage of SIMD and SIMT computing models. Launched in 2013, the GeantV project studies performance gains in propagating multiple particles in parallel, improving instruction throughput and data locality in HEP event simulation on modern parallel hardware architecture. Due to the complexity of geometry description and physics algorithms of a typical HEP application, performance analysis is indispensable in identifying factors limiting parallel execution. In this report, we will present design considerations and preliminary computing performance of GeantV physics models on coprocessors (Intel Xeon Phi and NVidia GPUs) as well as on mainstream CPUs.

  17. Model Reduction of Hybrid Systems

    DEFF Research Database (Denmark)

    Shaker, Hamid Reza

    systems are derived in this thesis. The results are used for output feedback control of switched nonlinear systems. Model reduction of piecewise affine systems is also studied in this thesis. The proposed method is based on the reduction of linear subsystems inside the polytopes. The methods which......High-Technological solutions of today are characterized by complex dynamical models. A lot of these models have inherent hybrid/switching structure. Hybrid/switched systems are powerful models for distributed embedded systems design where discrete controls are applied to continuous processes...... of hybrid systems, designing controllers and implementations is very high so that the use of these models is limited in applications where the size of the state space is large. To cope with complexity, model reduction is a powerful technique. This thesis presents methods for model reduction and stability...

  18. Modelling on fuzzy control systems

    Institute of Scientific and Technical Information of China (English)

    LI; Hongxing(李洪兴); WANG; Jiayin(王加银); MIAO; Zhihong(苗志宏)

    2002-01-01

    A kind of modelling method for fuzzy control systems is first proposed here, which is calledmodelling method based on fuzzy inference (MMFI). It should be regarded as the third modelling method thatis different from two well-known modelling methods, that is, the first modelling method, mechanism modellingmethod (MMM), and the second modelling method, system identification modelling method (SlMM). Thismethod can, based on the interpolation mechanism on fuzzy logic system, transfer a group of fuzzy inferencerules describing a practice system into a kind of nonlinear differential equation with variable coefficients, calledHX equations, so that the mathematical model of the system can be obtained. This means that we solve thedifficult problem of how to get a model represented as differential equations on a complicated or fuzzy controlsystem.

  19. Energy System Modeling with REopt

    Energy Technology Data Exchange (ETDEWEB)

    Simpkins, Travis; Anderson, Kate; Cutler, Dylan; Olis, Dan; Elgqvist, Emma; DiOrio, Nick; Walker, Andy

    2016-07-15

    This poster details how REopt - NREL's software modeling platform for energy systems integration and optimization - can help to model energy systems. Some benefits of modeling with REopt include optimizing behind the meter storage for cost and resiliency, optimizing lab testing, optimizing dispatch of utility scale storage, and quantifying renewable energy impact on outage survivability.

  20. Nonlinear Random Effects Mixture Models: Maximum Likelihood Estimation via the EM Algorithm.

    Science.gov (United States)

    Wang, Xiaoning; Schumitzky, Alan; D'Argenio, David Z

    2007-08-15

    Nonlinear random effects models with finite mixture structures are used to identify polymorphism in pharmacokinetic/pharmacodynamic phenotypes. An EM algorithm for maximum likelihood estimation approach is developed and uses sampling-based methods to implement the expectation step, that results in an analytically tractable maximization step. A benefit of the approach is that no model linearization is performed and the estimation precision can be arbitrarily controlled by the sampling process. A detailed simulation study illustrates the feasibility of the estimation approach and evaluates its performance. Applications of the proposed nonlinear random effects mixture model approach to other population pharmacokinetic/pharmacodynamic problems will be of interest for future investigation.

  1. Environmental Management System (EMS) objectives & targets annual results summary :

    Energy Technology Data Exchange (ETDEWEB)

    Vetter, Douglas Walter

    2013-02-01

    Sandia National Laboratories/New Mexicos (SNL/NM) Environmental Management System is the integrated approach for members of the workforce to identify and manage environmental risks. Each Fiscal Year (FY) SNL/NM performs an analysis to identify environmental aspects, and the environmental programs associated with them are charged with the task of routinely monitoring and measuring the objectives and targets that are established to mitigate potential impacts of SNL/NMs operations on the environment. An annual summary of the results achieved towards meeting established objectives and targets provides a connection to, and rational for, annually revised environmental aspects. The purpose of this document is to summarize the results achieved and documented in FY2012.

  2. Fisiologia de mudas de morangueiro produzidas em sistema convencional e em vasos suspensos Strawberry runners phisiology produced in conventional and suspended pots systems

    Directory of Open Access Journals (Sweden)

    Marcelo Fontanetti Verdial

    2009-06-01

    Full Text Available A utilização de um sistema adequado para a condução das plantas-matrizes fornecedoras de mudas é de fundamental importância, tanto com a finalidade de favorecer a quantidade de mudas produzidas, como para a qualidade das mesmas; por outro lado, a disponibilidade de mudas em períodos não convencionais de plantio, através da utilização da frigoconservação, possibilita a produção de frutos na entressafra, propiciando maiores ganhos pelos produtores devido aos melhores preços alcançados. Os presentes trabalhos tiveram como objetivos comparar o sistema de produção de mudas de morangueiro convencional com o de produção em vasos suspensos, assim como avaliar a frigoconservação em mudas produzidas em sistema de vasos suspensos. Avaliaram-se a matéria seca, os teores de carboidratos nas mudas e a percentagem de sobrevivência das mesmas após o transplante para local definitivo. No primeiro trabalho, foi utilizado o delineamento inteiramente ao acaso, em esquema fatorial 3x2 (três cultivares: Campinas, Pelican e Guarani; e dois sistemas de produção de mudas, com três repetições de 30 mudas; no segundo trabalho, utilizou-se o delineamento experimental inteiramente ao acaso, com cinco cultivares (Campinas, Dover, Pelican, Sequoia e Sweet Charlie e nove repetições. Neste último trabalho, após a coleta, as mudas foram acondicionadas em sacos de polietileno e frigoconservadas durante 120 dias em câmara fria (-1 ± 1ºC. As mudas produzidas em vasos suspensos apresentaram maior percentagem de sobrevivência e maiores teores de carboidratos totais, com resultados semelhantes para as três cultivares estudadas. A frigoconservação de mudas de morangueiro produzidas em sistema de vasos suspensos resultou em baixa percentagem de sobrevivência de mudas no experimento.An appropriate conduction system of the plants that originate the runners has a fundamental importance, in order to favor the amount of produced plants and their

  3. Modeling soft interface dominated systems

    NARCIS (Netherlands)

    Lamorgese, A.; Mauri, R.; Sagis, L.M.C.

    2017-01-01

    The two main continuum frameworks used for modeling the dynamics of soft multiphase systems are the Gibbs dividing surface model, and the diffuse interface model. In the former the interface is modeled as a two dimensional surface, and excess properties such as a surface density, or surface energy

  4. Validation of systems biology models

    NARCIS (Netherlands)

    Hasdemir, D.

    2015-01-01

    The paradigm shift from qualitative to quantitative analysis of biological systems brought a substantial number of modeling approaches to the stage of molecular biology research. These include but certainly are not limited to nonlinear kinetic models, static network models and models obtained by the

  5. Modeling of deterministic chaotic systems

    Energy Technology Data Exchange (ETDEWEB)

    Lai, Y. [Department of Physics and Astronomy and Department of Mathematics, The University of Kansas, Lawrence, Kansas 66045 (United States); Grebogi, C. [Institute for Plasma Research, University of Maryland, College Park, Maryland 20742 (United States); Grebogi, C.; Kurths, J. [Department of Physics and Astrophysics, Universitaet Potsdam, Postfach 601553, D-14415 Potsdam (Germany)

    1999-03-01

    The success of deterministic modeling of a physical system relies on whether the solution of the model would approximate the dynamics of the actual system. When the system is chaotic, situations can arise where periodic orbits embedded in the chaotic set have distinct number of unstable directions and, as a consequence, no model of the system produces reasonably long trajectories that are realized by nature. We argue and present physical examples indicating that, in such a case, though the model is deterministic and low dimensional, statistical quantities can still be reliably computed. {copyright} {ital 1999} {ital The American Physical Society}

  6. Modelling of wastewater systems

    DEFF Research Database (Denmark)

    Bechmann, Henrik

    In this thesis, models of pollution fluxes in the inlet to 2 Danish wastewater treatment plants (WWTPs) as well as of suspended solids (SS) concentrations in the aeration tanks of an alternating WWTP and in the effluent from the aeration tanks are developed. The latter model is furthermore used...

  7. Modelling Epistemic Systems

    CERN Document Server

    Martins, Andre C R

    2012-01-01

    In this Chapter, I will explore the use of modeling in order to understand how Science works. I will discuss the modeling of scientific communities, providing a general, non-comprehensive overview of existing models, with a focus on the use of the tools of Agent-Based Modeling and Opinion Dynamics. A special attention will be paid to models inspired by a Bayesian formalism of Opinion Dynamics. The objective of this exploration is to better understand the effect that different conditions might have on the reliability of the opinions of a scientific community. We will see that, by using artificial worlds as exploring grounds, we can prevent some epistemological problems with the definition of truth and obtain insights on the conditions that might cause the quest for more reliable knowledge to fail.

  8. From Numeric Models to Granular System Modeling

    Directory of Open Access Journals (Sweden)

    Witold Pedrycz

    2015-03-01

    To make this study self-contained, we briefly recall the key concepts of granular computing and demonstrate how this conceptual framework and its algorithmic fundamentals give rise to granular models. We discuss several representative formal setups used in describing and processing information granules including fuzzy sets, rough sets, and interval calculus. Key architectures of models dwell upon relationships among information granules. We demonstrate how information granularity and its optimization can be regarded as an important design asset to be exploited in system modeling and giving rise to granular models. With this regard, an important category of rule-based models along with their granular enrichments is studied in detail.

  9. Impediments of Environment Management System (EMS Implementation in Malaysian Local Authorities – A Preliminary Finding

    Directory of Open Access Journals (Sweden)

    Madi Nero

    2017-01-01

    Full Text Available The implementation of environmental management system (EMS by public sector agencies is in line with the Malaysian Government Transformation Programme (GTP and the New Public Management doctrine. Local authority is chosen as a sample because of its important role in advancing towards sustainable development. This study aims to examine impediments to the ISO 14001 implementation by Malaysian local authorities using the institutional theory as the underlying framework. The survey instrument was developed and distributed via mail to all 146 local authorities in Malaysia. Finding revealed that the impediments to the EMS implementation were explained by lack of coercive, normative and mimetic isomorphism under the institutional theory. It is expected that the survey findings would fill in the gaps in the literature in better understanding the lack of implementation of IS00 14001 particularly in the emerging economy.

  10. A high EMS daisy-chain SPI interface for battery monitor system

    Science.gov (United States)

    Zhang, Qidong; Yang, Yintang; Chai, Changchun

    2017-03-01

    A high EMS current-mode SPI interface for battery monitor IC (BMIC) is presented to form a daisychain bus configuration for the cascaded BMICs and the communication between the MCU and master BMIC. Based on analog and digital mixed filtering technique, the proposed daisy-chain can avoid the isolated communication issue in electromagnetic interference environment, and reduce the extensively required I/O ports of MCU, at the same time reduce the system cost. The proposed daisy-chain interface was introduced in a 6-ch battery monitor IC which was fabricated with 0.35 μm 30 V BCD process. The measurement result shows that the presented daisy-chain SPI interface achieves better EMS performance with different EMI injection while just consuming a total operation current up to 1 mA. Project supported by the National Natural Science Foundation of China (No. 61334003).

  11. Risk factor selection in rate making: EM adaptive LASSO for zero-inflated poisson regression models.

    Science.gov (United States)

    Tang, Yanlin; Xiang, Liya; Zhu, Zhongyi

    2014-06-01

    Risk factor selection is very important in the insurance industry, which helps precise rate making and studying the features of high-quality insureds. Zero-inflated data are common in insurance, such as the claim frequency data, and zero-inflation makes the selection of risk factors quite difficult. In this article, we propose a new risk factor selection approach, EM adaptive LASSO, for a zero-inflated Poisson regression model, which combines the EM algorithm and adaptive LASSO penalty. Under some regularity conditions, we show that, with probability approaching 1, important factors are selected and the redundant factors are excluded. We investigate the finite sample performance of the proposed method through a simulation study and the analysis of car insurance data from SAS Enterprise Miner database.

  12. Pluralistic Modeling of Complex Systems

    CERN Document Server

    Helbing, Dirk

    2010-01-01

    The modeling of complex systems such as ecological or socio-economic systems can be very challenging. Although various modeling approaches exist, they are generally not compatible and mutually consistent, and empirical data often do not allow one to decide what model is the right one, the best one, or most appropriate one. Moreover, as the recent financial and economic crisis shows, relying on a single, idealized model can be very costly. This contribution tries to shed new light on problems that arise when complex systems are modeled. While the arguments can be transferred to many different systems, the related scientific challenges are illustrated for social, economic, and traffic systems. The contribution discusses issues that are sometimes overlooked and tries to overcome some frequent misunderstandings and controversies of the past. At the same time, it is highlighted how some long-standing scientific puzzles may be solved by considering non-linear models of heterogeneous agents with spatio-temporal inte...

  13. Pharmacological Classification and Activity Evaluation of Furan and Thiophene Amide Derivatives Applying Semi-Empirical <em>ab initioem> Molecular Modeling Methods

    Directory of Open Access Journals (Sweden)

    Leszek Bober

    2012-05-01

    Full Text Available Pharmacological and physicochemical classification of the furan and thiophene amide derivatives by multiple regression analysis and partial least square (PLS based on semi-empirical <em>ab initioem> molecular modeling studies and high-performance liquid chromatography (HPLC retention data is proposed. Structural parameters obtained from the PCM (Polarizable Continuum Model method and the literature values of biological activity (antiproliferative for the A431 cells expressed as LD50 of the examined furan and thiophene derivatives was used to search for relationships. It was tested how variable molecular modeling conditions considered together, with or without HPLC retention data, allow evaluation of the structural recognition of furan and thiophene derivatives with respect to their pharmacological properties.

  14. Model Selection Criteria for Missing-Data Problems Using the EM Algorithm.

    Science.gov (United States)

    Ibrahim, Joseph G; Zhu, Hongtu; Tang, Niansheng

    2008-12-01

    We consider novel methods for the computation of model selection criteria in missing-data problems based on the output of the EM algorithm. The methodology is very general and can be applied to numerous situations involving incomplete data within an EM framework, from covariates missing at random in arbitrary regression models to nonignorably missing longitudinal responses and/or covariates. Toward this goal, we develop a class of information criteria for missing-data problems, called IC(H) (,) (Q), which yields the Akaike information criterion and the Bayesian information criterion as special cases. The computation of IC(H) (,) (Q) requires an analytic approximation to a complicated function, called the H-function, along with output from the EM algorithm used in obtaining maximum likelihood estimates. The approximation to the H-function leads to a large class of information criteria, called IC(H̃) (() (k) (),) (Q). Theoretical properties of IC(H̃) (() (k) (),) (Q), including consistency, are investigated in detail. To eliminate the analytic approximation to the H-function, a computationally simpler approximation to IC(H) (,) (Q), called IC(Q), is proposed, the computation of which depends solely on the Q-function of the EM algorithm. Advantages and disadvantages of IC(H̃) (() (k) (),) (Q) and IC(Q) are discussed and examined in detail in the context of missing-data problems. Extensive simulations are given to demonstrate the methodology and examine the small-sample and large-sample performance of IC(H̃) (() (k) (),) (Q) and IC(Q) in missing-data problems. An AIDS data set also is presented to illustrate the proposed methodology.

  15. Modelagem de um sistema de informação para rastreabilidade na indústria do vinho baseado em uma arquitetura orientada a serviços Modeling of an information system for wine traceability based on a service oriented architecture

    Directory of Open Access Journals (Sweden)

    Osvaldo Gogliano Sobrinho

    2010-02-01

    Full Text Available Apresenta-se neste trabalho pesquisa científica que levou à modelagem de um sistema de informação para o registro de dados de rastreabilidade destinado à indústria do vinho, segundo os conceitos de uma arquitetura computacional orientada a serviços (service oriented architecture, SOA. Desde 2005, a manutenção de tais registros é obrigatória para todos os produtores que pretendem exportar para países da União Europeia. Ademais, os consumidores finais, inclusive brasileiros, preocupados com a segurança alimentar, apresentam demanda crescente por informações. Buscou-se uma solução que contemple a indústria coletivamente, por meio de consórcios ou associações de produtores, diluindo custos e compartilhando benefícios. A partir do levantamento bibliográfico realizado e de contatos com pesquisadores e representantes do setor produtivo vinícola brasileiro, em Bento Gonçalves -RS, pesquisaram-se tópicos de tecnologia da informação ligados ao tema, além de detalhes sobre o processo produtivo do vinho. A partir de um modelo do processo produtivo do vinho sugerido pelos autores, empregou-se a Unified Modeling Language (UML, para a modelagem do sistema, que utiliza a tecnologia de web services para o tráfego de dados. Com um protótipo funcional, constataram-se a viabilidade do modelo e a possibilidade de sua utilização em outros domínios.The purpose is to present a scientific research that led to the modeling of an information system which aimed at the maintenance of traceability data in the Brazilian wine industry, according to the principles of a service-oriented architecture (SOA. Since 2005, traceability data maintenance is an obligation for all producers that intend to export to any European Union country. Also, final customers, including the Brazilian ones, have been asking for information about food products. A solution that collectively contemplated the industry was sought in order to permit that producer

  16. Inclusion of environmental costs on a long-term expansion model of hydrothermal generation systems; Insercao dos custos ambientais em um modelo de expansao da geracao a longo prazo

    Energy Technology Data Exchange (ETDEWEB)

    Santos Henrique Luz

    2008-02-15

    This dissertation presents the development of a mathematical model to be used in the hydrothermal generation expansion planning taking into account uncertainties, the guarantee of energy supply and issues related to the social and environmental problems caused by the power sector. Named 'MELP Ambiental', it is a version of MELP, a model developed by Machado Junior (2000). The environmental valuation was based on results of previous studies. The analysis of the environmental costs scenarios showed that the inclusion of a variable linked to externalities implies in changes on the investment schedule. These changes decrease the total cost (economic and environmental) related to long-term power supply expansion. (author)

  17. A reliability centered maintenance model applied to the auxiliary feedwater system of a nuclear power plant; Um modelo de manutencao centrada em confiabilidade aplicada ao sistema de agua de alimentacaco auxiliar de uma usina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Jefferson Borges

    1998-01-15

    The main objective of maintenance in a nuclear power plant is to assure that structures, systems and components will perform their design functions with reliability and availability in order to obtain a safety and economic electric power generation. Reliability Centered Maintenance (RCM) is a method of systematic review to develop or optimize Preventive Maintenance Programs. This study presents the objectives, concepts, organization and methods used in the development of RCM application to nuclear power plants. Some examples of this application are included, considering the Auxiliary Feedwater System of a generic two loops PWR nuclear power plant of Westinghouse design. (author)

  18. Bioassay-Guided Isolation and Identification of Cytotoxic Compounds from <em>Gymnosperma> <em>glutinosum> Leaves

    Directory of Open Access Journals (Sweden)

    Cristina Rodríguez-Padilla

    2012-09-01

    Full Text Available Bioassay-guided fractionation of hexane extracts of<em> Gymnosperma glutinosumem> (Asteraceae leaves, collected in North Mexico, afforded the known compounds hentriacontane (1 and (+-13<em>S>,14<em>R>,15-trihydroxy-<em>ent>-labd-7-ene (2, as well as the new <em>ent>-labdane diterpene (−-13<em>S>,14<em>R>,15-trihydroxy-7-oxo-<em>ent>-labd-8(9-ene (3. In addition, D-glycero-D-galactoheptitol (4 was isolated from the methanolic extract of this plant. Their structures were established on the basis of high-field 1D- and 2D NMR methods supported by HR-MS data. The cytotoxic activity was determined by using the <em>in vitroem> L5178Y-R lymphoma murine model. Hentriacontane (1 and the new <em>ent>-labdane 3 showed weak cytotoxicity, whereas the <em>ent>-labdane 2 showed significant (<em>p> < 0.05 and concentration dependent cytotoxicity (up to 78% against L5178Y-R cells at concentrations ranging from 7.8 to 250 µg/mL.

  19. Helicopter-borne measurements of sea ice thickness, using a small and lightweight, digital EM system

    Science.gov (United States)

    Haas, Christian; Lobach, John; Hendricks, Stefan; Rabenstein, Lasse; Pfaffling, Andreas

    2009-03-01

    Sea ice is an important climate variable and is also an obstacle for marine operations in polar regions. We have developed a small and lightweight, digitally operated frequency-domain electromagnetic-induction (EM) system, a so-called EM bird, dedicated for measurements of sea ice thickness. It is 3.5 m long and weighs only 105 kg, and can therefore easily be shipped to remote places and operated from icebreakers and small helicopters. Here, we describe the technical design of the bird operating at two frequencies of f1 = 3.68 kHz and f2 = 112 kHz, and study its technical performance. On average, noise amounts to ± 8.5 ppm and ± 17.5 ppm for f1 and f2, respectively. Electrical drift amounts to 200 ppm/h and 2000 ppm/h for f1 and f2, during the first 0.5 h of operation. It is reduced by 75% after 2 h. Calibration of the Inphase and Quadrature ppm signals varies by 2 to 3%. A sensitivity study shows that all these signal variations do affect the accuracy of the ice thickness retrieval, but that it remains better than ± 0.1 m over level ice in most cases. This accuracy is also confirmed by means of comparisons of the helicopter EM data with other thickness measurements. The paper also presents the ice thickness retrieval from single-component Inphase data of f1.

  20. National environmental/economic infrastructure system model

    Energy Technology Data Exchange (ETDEWEB)

    Drake, R.H.; Hardie, R.W.; Loose, V.W.; Booth, S.R.

    1997-08-01

    This is the final report for a one-year Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The ultimate goal was to develop a new methodology for macroeconomic modeling applied to national environmental and economic problems. A modeling demonstration and briefings were produced, and significant internal technical support and program interest has been generated. External contacts with DOE`s Office of Environmental Management (DOE-EM), US State Department, and the US intelligence community were established. As a result of DOE-EM interest and requests for further development, this research has been redirected to national environmental simulations as a new LDRD project.

  1. Integrated Modeling Systems

    Science.gov (United States)

    1989-01-01

    American Economic Review , 71:1 (March 1981). 181 J.M. Jones and F. Zufryden. "Adding Explanatory Variables to a Consumer Purchase Behavior Model: An...McCall. "An Operational Measure of Liquidity," The American Economic Review , 761 (March 1986). WMSI Working Paper 329. 212 Nelson, R., R. Sarin, and R

  2. Robust Disaster Recovery System Model

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model (RDRSM). Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D real-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.

  3. Avaliação da aplicabilidade de um modelo de credit scoring com varíaveis sistêmicas e não-sistêmicas em carteiras de crédito bancário rotativo de pessoas físicas An evaluation on the applicability of a credit scoring model, with systemic and non-systemic variables in revolving bank credit portfolio for individuals

    Directory of Open Access Journals (Sweden)

    José Odálio dos Santos

    2007-08-01

    capability. Likewise, a more significant historical exposition of the banks to insolvency risk is being observed, such as the risk of not getting paid (partially or totally and the revolving credit borrowed by consumers. Considering the size and the importance of this market to the great commercial banks and to the economy as a whole, the scope of this research comprises the following points: 1. detailing the processes of subjective and objective credit analysis carried out by the main domestic private banks; 2. approaching the selective function of interest rates in revolving credits; 3. highlighting the main characteristics of credit scoring models; and 4. proposing a model of credit scoring for revolving credits. This model is based on systemic and non-systemic variables and directed to the reduction of insolvency risk. The applicability of the credit scoring model proposed in a sample, extracted from the consumers credit portfolio which belongs to an important medium size Brazilian private commercial bank (Bank X - fictitious name, presented a satisfactory accuracy level in the identification of prospective (96% and non-prospective (92% clients, which led to the conclusion that it included and considered adequately the representative variables of borrowers’ payment capability.

  4. Mechanical Systems, Classical Models

    CERN Document Server

    Teodorescu, Petre P

    2007-01-01

    All phenomena in nature are characterized by motion; this is an essential property of matter, having infinitely many aspects. Motion can be mechanical, physical, chemical or biological, leading to various sciences of nature, mechanics being one of them. Mechanics deals with the objective laws of mechanical motion of bodies, the simplest form of motion. In the study of a science of nature mathematics plays an important role. Mechanics is the first science of nature which was expressed in terms of mathematics by considering various mathematical models, associated to phenomena of the surrounding nature. Thus, its development was influenced by the use of a strong mathematical tool; on the other hand, we must observe that mechanics also influenced the introduction and the development of many mathematical notions. In this respect, the guideline of the present book is precisely the mathematical model of mechanics. A special accent is put on the solving methodology as well as on the mathematical tools used; vectors, ...

  5. <em>Botulinum Neurotoxinem> A Injections Influence Stretching of the Gastrocnemius Muscle-Tendon Unit in an Animal Model

    Directory of Open Access Journals (Sweden)

    Christopher J. Tuohy

    2012-08-01

    Full Text Available <em>Botulinum Neurotoxinem> A (BoNT-A injections have been used for the treatment of muscle contractures and spasticity. This study assessed the influence of (BoNT-A injections on passive biomechanical properties of the muscle-tendon unit. Mouse gastrocnemius muscle (GC was injected with BoNT-A (<em>n> = 18 or normal saline (<em>n> = 18 and passive, non-destructive, <em>in vivoem> load relaxation experimentation was performed to examine how the muscle-tendon unit behaves after chemical denervation with BoNT-A. Injection of BoNT-A impaired passive muscle recovery (15% <em>vs.> 35% recovery to pre-stretching baseline, <em>p> < 0.05 and decreased GC stiffness (0.531 ± 0.061 N/mm <em>vs.> 0.780 ± 0.037 N/mm, <em>p> < 0.05 compared to saline controls. The successful use of BoNT-A injections as an adjunct to physical therapy may be in part attributed to the disruption of the stretch reflex; thereby modulating <em>in vivoem> passive muscle properties. However, it is also possible that BoNT-A injection may alter the structure of skeletal muscle; thus modulating the <em>in vivoem> passive biomechanical properties of the muscle-tendon unit.

  6. Studies of Catalytic Model Systems

    DEFF Research Database (Denmark)

    Holse, Christian

    The overall topic of this thesis is within the field of catalysis, were model systems of different complexity have been studied utilizing a multipurpose Ultra High Vacuum chamber (UHV). The thesis falls in two different parts. First a simple model system in the form of a ruthenium single crystal...... is investigated. Second the development of a complex Cu/ZnO nanoparticle model system is described and gas-induced dynamical changes in the model system is investigated. The ruthenium crystal serves as an extremely simple model for studying CO dissociation which is the rate limiting step of the methanation...... process. The Ru(0 1 54) surface is studied by means of Scanning Tunneling Microscopy (STM), Temperature Programmed Desoprtion (TPD), and Oxygen Titration (OT) experiments. Real space evidence of periodic features on every second monatomic step is observed via STM when the a clean ruthenium surface...

  7. Relocatable Coastal Modeling System

    Science.gov (United States)

    2016-06-07

    These relationships are stored on a variable-resolution grid (illustrated in figure 1b below) with sampling of 1 degree in deep water (and in data...version is referred to as MODAS2.1, which is now operational at NAVO. The NOMADS interface is being replaced by a system-independent, web -based version...inside the user’s web browser plus Perl CGI scripts which ran on a webserver. This permitted the user to run MODAS (and POM and other modules as they are

  8. Uso de modelação matemática para projeto de câmaras mecanizadas de floculação em série em estações de tratamento de água The use of mathematical modeling to the design of continous flow completely mixed chambers in series for flocculation in water treatment plants

    Directory of Open Access Journals (Sweden)

    Luiz Di Bernardo

    2005-03-01

    Full Text Available A metodologia encontrada na literatura para a otimização do gradiente de velocidade médio em reatores de mistura completa, com câmaras em série de escoamento contínuo, a partir de ensaios em reator estático tipo jarteste, baseia-se em modelos matemáticos que descrevem a cinética dos encontros entre partículas durante a floculação. Considerando-se que a aplicabilidade desta metodologia tem-se revelado inconsistente, como observado por diversos autores, este trabalho propõe uma metodologia racional para utilizar e otimizar os dados experimentais obtidos em reatores estáticos e, utilizando modelos matemáticos, obter dados para o projeto de floculadores mecanizados em série em estações de tratamento de água.The existing methodology in the literature to optimize the velocity gradients in continuous flow completely mixed reactors using batch test data (static reactors is based on mathematical models that describe the flocculation kinetics. Since this methodology has been shown to be inconsistent, as observed by several researchers, this work was carried out in order to propose a rational methodology to optimize the static reactors experimental data to obtain the design parameters of mechanized flocculation systems for water treatment plants.

  9. Mites in assai palms (Euterpe oleracea Mart. conducted under different cropping systems = Acarofauna em açaizeiro (Euterpe oleracea Mart. conduzido em diferentes sistemas de cultivo

    Directory of Open Access Journals (Sweden)

    Rodrigo Aguiar Rodrigues

    2016-10-01

    Full Text Available The assai palm (Euterpe oleracea is the most important palm tree of the genus Euterpe known in Brazil, which is grown under monocrop and intercrop systems. Despite its great usefulness, this palm tree is important for supplying two cost-effective food products, the fruit and the palm hearts. Due to its importance, the aim of this study was to carry out a survey of mite fauna present in assai crops in the town of São Luis, in the State of Maranhão, Brazil. Samples were collected monthly from August 2012 to July 2013, in assai groves under two systems of cultivation: monocrop and intercrop. A faunistic analysis was carried out using the ANAFAU software, when the following indices were determined: abundance, frequency, dominance, constancy and diversity. A total of 6,274 mites were found, with 4,748 in the intercrop system and 1,526 in the monocrop system. Among the occurrence of phytophagic mites, the families Tenuipalpidae and Tetranychidae were significant in both crops. For the families of predatory mites, the phytoseiid was considered super-dominant, super-abundant, super-frequent and constant; the species Amblyseius largoensis, Euseius concordis and Iphiseiodes zuluagai were dominant under both cropping systems, but the intercrop displayed greater diversity compared to the monocrop. For population dynamics, larger populations of mites were seen in periods of low rainfall under the two systems studied. = O açaizeiro (Euterpe oleraceae é a mais importante palmeira do gênero Euterpe conhecida no Brasil, que é cultivada em sistemas de cultivo solteiro e consorciado. Apesar da grande utilidade, esta palmeira se destaca no fornecimento de dois produtos alimentares economicamente rentáveis, os frutos e o palmito. Em razão da sua importância, objetivou-se com este trabalho realizar o levantamento da acarofauna presente em cultivos de açaizeiro no município de São Luís - Maranhão. As amostragens foram realizadas mensalmente, no per

  10. An approach towards solving refraction problems in EM1002 multi-beam echo-sounder system

    Digital Repository Service at National Institute of Oceanography (India)

    Fernandes, W.A.

    /plot/map generating software). At shore, we analyzed the EM1002 multi-beam echo-sounder system data through above mentioned modules by using the given processing procedure (Appendix -1). The problem was detected at initial stage of gridding and crosschecked... directory. 3. select extract attitude and UTM. 4. now start the process B) Open a terminal window and type set SLEEP_TIME=0 Now navigate to the raw data directory with *.all files cd (directory with the .all files) cat *.all | ddsemx -s india...

  11. A spectral domain approach to modelling of EM scattering for Synthetic Aperture Radar target recognition

    Science.gov (United States)

    Sabry, R.; Vachon, P. W.

    2005-08-01

    A Fourier-based technique for electromagnetic (EM) wave reconstruction with application to polarimetric airborne and spaceborne radar data exploitation is presented. The method is different from conventional modelling techniques for Synthetic Aperture Radar (SAR) applications as a result of the full electromagnetic treatment of field interactions with the scatterer, the possibility of introducing new and controllable feature classes for target classification, and accurate decomposition of the source impulse response function that avoids potential errors (e.g. loss of coherent information) associated with the spherical phase approximations. The capability of extracting scatterer information such as the coherent radar cross section (RCS) is explored.

  12. Finite sample performance of the E-M algorithm for ranks data modelling

    Directory of Open Access Journals (Sweden)

    Angela D'Elia

    2007-10-01

    Full Text Available We check the finite sample performance of the maximum likelihood estimators of the parameters of a mixture distribution recently introduced for modelling ranks/preference data. The estimates are derived by the E-M algorithm and the performance is evaluated both from an univariate and bivariate points of view. While the results are generally acceptable as far as it concerns the bias, the Monte Carlo experiment shows a different behaviour of the estimators efficiency for the two parameters of the mixture, mainly depending upon their location in the admissible parametric space. Some operative suggestions conclude the paer.

  13. Hydronic distribution system computer model

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, J.W.; Strasser, J.J.

    1994-10-01

    A computer model of a hot-water boiler and its associated hydronic thermal distribution loop has been developed at Brookhaven National Laboratory (BNL). It is intended to be incorporated as a submodel in a comprehensive model of residential-scale thermal distribution systems developed at Lawrence Berkeley. This will give the combined model the capability of modeling forced-air and hydronic distribution systems in the same house using the same supporting software. This report describes the development of the BNL hydronics model, initial results and internal consistency checks, and its intended relationship to the LBL model. A method of interacting with the LBL model that does not require physical integration of the two codes is described. This will provide capability now, with reduced up-front cost, as long as the number of runs required is not large.

  14. Data management system performance modeling

    Science.gov (United States)

    Kiser, Larry M.

    1993-01-01

    This paper discusses analytical techniques that have been used to gain a better understanding of the Space Station Freedom's (SSF's) Data Management System (DMS). The DMS is a complex, distributed, real-time computer system that has been redesigned numerous times. The implications of these redesigns have not been fully analyzed. This paper discusses the advantages and disadvantages for static analytical techniques such as Rate Monotonic Analysis (RMA) and also provides a rationale for dynamic modeling. Factors such as system architecture, processor utilization, bus architecture, queuing, etc. are well suited for analysis with a dynamic model. The significance of performance measures for a real-time system are discussed.

  15. Robust maximum-likelihood parameter estimation of stochastic state-space systems based on EM algorithm

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This paper addresses the problems of parameter estimation of multivariable stationary stochastic systems on the basis of observed output data. The main contribution is to employ the expectation-maximisation (EM) method as a means for computation of the maximum-likelihood (ML) parameter estimation of the system. Closed form of the expectation of the studied system subjected to Gaussian distribution noise is derived and paraneter choice that maximizes the expectation is also proposed. This results in an iterative algorithm for parameter estimation and the robust algorithm implementation based on technique of QR-factorization and Cholesky factorization is also discussed. Moreover, algorithmic properties such as non-decreasing likelihood value, necessary and sufficient conditions for the algorithm to arrive at a local stationary parameter, the convergence rate and the factors affecting the convergence rate are analyzed. Simulation study shows that the proposed algorithm has attractive properties such as numerical stability, and avoidance of difficult initial conditions.

  16. National Energy Outlook Modelling System

    Energy Technology Data Exchange (ETDEWEB)

    Volkers, C.M. [ECN Policy Studies, Petten (Netherlands)

    2013-12-15

    For over 20 years, the Energy research Centre of the Netherlands (ECN) has been developing the National Energy Outlook Modelling System (NEOMS) for Energy projections and policy evaluations. NEOMS enables 12 energy models of ECN to exchange data and produce consistent and detailed results.

  17. ABSTRACT MODELS FOR SYSTEM VIRTUALIZATION

    Directory of Open Access Journals (Sweden)

    M. G. Koveshnikov

    2015-05-01

    Full Text Available The paper is dedicated to issues of system objects securing (system files and user system or application configuration files against unauthorized access including denial of service attacks. We have suggested the method and developed abstract system virtualization models, which are used toresearch attack scenarios for different virtualization modes. Estimation for system tools virtualization technology effectiveness is given. Suggested technology is based on redirection of access requests to system objects shared among access subjects. Whole and partial system virtualization modes have been modeled. The difference between them is the following: in the whole virtualization mode all copies of access system objects are created whereon subjects’ requests are redirected including corresponding application objects;in the partial virtualization mode corresponding copies are created only for part of a system, for example, only system objects for applications. Alternative solutions effectiveness is valued relating to different attack scenarios. We consider proprietary and approved technical solution which implements system virtualization method for Microsoft Windows OS family. Administrative simplicity and capabilities of correspondingly designed system objects security tools are illustrated on this example. Practical significance of the suggested security method has been confirmed.

  18. NASA SPoRT Initialization Datasets for Local Model Runs in the Environmental Modeling System

    Science.gov (United States)

    Case, Jonathan L.; LaFontaine, Frank J.; Molthan, Andrew L.; Carcione, Brian; Wood, Lance; Maloney, Joseph; Estupinan, Jeral; Medlin, Jeffrey M.; Blottman, Peter; Rozumalski, Robert A.

    2011-01-01

    The NASA Short-term Prediction Research and Transition (SPoRT) Center has developed several products for its National Weather Service (NWS) partners that can be used to initialize local model runs within the Weather Research and Forecasting (WRF) Environmental Modeling System (EMS). These real-time datasets consist of surface-based information updated at least once per day, and produced in a composite or gridded product that is easily incorporated into the WRF EMS. The primary goal for making these NASA datasets available to the WRF EMS community is to provide timely and high-quality information at a spatial resolution comparable to that used in the local model configurations (i.e., convection-allowing scales). The current suite of SPoRT products supported in the WRF EMS include a Sea Surface Temperature (SST) composite, a Great Lakes sea-ice extent, a Greenness Vegetation Fraction (GVF) composite, and Land Information System (LIS) gridded output. The SPoRT SST composite is a blend of primarily the Moderate Resolution Imaging Spectroradiometer (MODIS) infrared and Advanced Microwave Scanning Radiometer for Earth Observing System data for non-precipitation coverage over the oceans at 2-km resolution. The composite includes a special lake surface temperature analysis over the Great Lakes using contributions from the Remote Sensing Systems temperature data. The Great Lakes Environmental Research Laboratory Ice Percentage product is used to create a sea-ice mask in the SPoRT SST composite. The sea-ice mask is produced daily (in-season) at 1.8-km resolution and identifies ice percentage from 0 100% in 10% increments, with values above 90% flagged as ice.

  19. Aerodynamic and Mechanical System Modelling

    DEFF Research Database (Denmark)

    Jørgensen, Martin Felix

    This thesis deals with mechanical multibody-systems applied to the drivetrain of a 500 kW wind turbine. Particular focus has been on gearbox modelling of wind turbines. The main part of the present project involved programming multibody systems to investigate the connection between forces, moments...

  20. Experimental Modeling of Dynamic Systems

    DEFF Research Database (Denmark)

    Knudsen, Morten Haack

    2006-01-01

    An engineering course, Simulation and Experimental Modeling, has been developed that is based on a method for direct estimation of physical parameters in dynamic systems. Compared with classical system identification, the method appears to be easier to understand, apply, and combine with physical...

  1. An extensible analysable system model

    DEFF Research Database (Denmark)

    Probst, Christian W.; Hansen, Rene Rydhof

    2008-01-01

    , this does not hold for real physical systems. Approaches such as threat modelling try to target the formalisation of the real-world domain, but still are far from the rigid techniques available in security research. Many currently available approaches to assurance of critical infrastructure security...... allows for easy development of analyses for the abstracted systems. We briefly present one application of our approach, namely the analysis of systems for potential insider threats....

  2. Memory embedded in Markov models specified in Statecharts: simulation versus analytical approaches Tratamento de memória em modelos Markovianos especificados em Statecharts: abordagens por simulação e analítica

    Directory of Open Access Journals (Sweden)

    Nandamudi Lankalapalli Vijaykumar

    2012-12-01

    Full Text Available Statecharts are a graphical representation to model reactive systems that respond to external or internal stimuli by changing the state of a given system. Statecharts can be seen as an extension of state-transition diagrams that allows modeling hierarchy, orthogonality, and interdependence. Due to their features to represent reactive systems, Statecharts have been adapted to represent and deal analytically with performance models (reactive systems whose performance is to be evaluated. An interesting feature present in Statecharts is to record the system's state, which cannot be represented in Markov models in a straightforward manner due to its "memory-less" property. The contributions of this paper are: show that Statecharts are a feasible alternative to specify a reactive system so that its performance can be evaluated by both analytical and simulation techniques; show that the inclusion of the memory representation in the Statecharts specification can indeed be made by both analytical and simulation techniques. The results of a case study of a manufacturing system show that the objectives are achieved.Statecharts representam graficamente sistemas reativos que respondem aos estímulos externos ou internos e mudam estados de um dado sistema. Statecharts estendem diagramas de estado com hierarquia, paralelismo e interdependência. Devido às suas características, eles foram adaptados para representar e tratar analiticamente modelos de desempenho (sistemas reativos cujo desempenho deve ser avaliado. Uma característica presente em Statecharts é registrar (ou memorizar um estado do sistema que não é possível representar numa forma direta em modelos Markovianos devido à sua propriedade de "sem memória". São duas as contribuições deste artigo: mostrar que Statecharts são viáveis para especificar sistemas reativos e avaliar o seu desempenho tanto por técnicas analíticas quanto por simulação; mostrar que a inclusão de representa

  3. Structural equation modeling in epidemiology Modelagem de equações estruturais em epidemiologia

    Directory of Open Access Journals (Sweden)

    Leila Denise Alves Ferreira Amorim

    2010-12-01

    Full Text Available Structural equation modeling (SEM is an important statistical tool for evaluating complex relations in several research areas. In epidemiology, the use and discussion of SEM have been limited thus far. This article presents basic principles and concepts in SEM, including an application using epidemiological data analysis from a study on the determinants of cognitive development in young children, considering constructs related to organization of the child's home environment, parenting style, and the child's health status. The relations between the constructs and cognitive development were measured. The results showed a positive association between psychosocial stimulus at home and cognitive development in young children. The article presents the contributions by SEM to epidemiology, highlighting the need for an a priori theoretical model for improving the study of epidemiological questions from a new perspective.A modelagem de equações estruturais (MEE é uma ferramenta estatística importante para avaliar relações complexas em várias áreas do conhecimento. Em Epidemiologia sua divulgação e uso são limitados. Este artigo apresenta princípios e conceitos básicos da MEE, com exemplo de aplicação na análise de dados epidemiológicos. A análise de dados é realizada em estudo que investiga determinantes do desenvolvimento cognitivo infantil, sendo definidos construtos relacionados à organização do ambiente da criança, ao seu status de saúde, e às práticas e estilo de vida dos pais. O impacto positivo da qualidade de estimulação psicossocial do ambiente doméstico sobre o índice de desempenho cognitivo (IDC esclarece que parte do efeito da estimulação sobre o IDC deve-se ao estilo parental de interação com a criança e às características físico-ambientais do contexto familiar. As potencialidades do uso da MEE em Epidemiologia são apresentadas, enfatizando-se a definição do modelo teórico e seu uso para

  4. Modeling Multi-Level Systems

    CERN Document Server

    Iordache, Octavian

    2011-01-01

    This book is devoted to modeling of multi-level complex systems, a challenging domain for engineers, researchers and entrepreneurs, confronted with the transition from learning and adaptability to evolvability and autonomy for technologies, devices and problem solving methods. Chapter 1 introduces the multi-scale and multi-level systems and highlights their presence in different domains of science and technology. Methodologies as, random systems, non-Archimedean analysis, category theory and specific techniques as model categorification and integrative closure, are presented in chapter 2. Chapters 3 and 4 describe polystochastic models, PSM, and their developments. Categorical formulation of integrative closure offers the general PSM framework which serves as a flexible guideline for a large variety of multi-level modeling problems. Focusing on chemical engineering, pharmaceutical and environmental case studies, the chapters 5 to 8 analyze mixing, turbulent dispersion and entropy production for multi-scale sy...

  5. Comparison of an Atomic Model and Its Cryo-EM Image at the Central Axis of a Helix.

    Science.gov (United States)

    He, Jing; Zeil, Stephanie; Hallak, Hussam; McKaig, Kele; Kovacs, Julio; Wriggers, Willy

    2015-11-01

    Cryo-electron microscopy (cryo-EM) is an important biophysical technique that produces three-dimensional (3D) density maps at different resolutions. Because more and more models are being produced from cryo-EM density maps, validation of the models is becoming important. We propose a method for measuring local agreement between a model and the density map using the central axis of the helix. This method was tested using 19 helices from cryo-EM density maps between 5.5 Å and 7.2 Å resolution and 94 helices from simulated density maps. This method distinguished most of the well-fitting helices, although challenges exist for shorter helices.

  6. A structural dynamic factor model for the effects of monetary policy estimated by the EM algorithm

    DEFF Research Database (Denmark)

    Bork, Lasse

    This paper applies the maximum likelihood based EM algorithm to a large-dimensional factor analysis of US monetary policy. Specifically, economy-wide effects of shocks to the US federal funds rate are estimated in a structural dynamic factor model in which 100+ US macroeconomic and financial time...... series are driven by the joint dynamics of the federal funds rate and a few correlated dynamic factors. This paper contains a number of methodological contributions to the existing literature on data-rich monetary policy analysis. Firstly, the identification scheme allows for correlated factor dynamics...... as opposed to the orthogonal factors resulting from the popular principal component approach to structural factor models. Correlated factors are economically more sensible and important for a richer monetary policy transmission mechanism. Secondly, I consider both static factor loadings as well as dynamic...

  7. EM Simulation Accuracy Enhancement for Broadband Modeling of On-Wafer Passive Components

    DEFF Research Database (Denmark)

    Johansen, Tom Keinicke; Jiang, Chenhui; Hadziabdic, Dzenan;

    2007-01-01

    This paper describes methods for accuracy enhancement in broadband modeling of on-wafer passive components using electromagnetic (EM) simulation. It is shown that standard excitation schemes for integrated component simulation leads to poor correlation with on-wafer measurements beyond the lower...... GHz frequency range. We show that this is due to parasitic effects and higher-order modes caused by the excitation schemes. We propose a simple equivalent circuit for the parasitic effects in the well-known ground ring excitation scheme. An extended L-2L calibration method is shown to improve...... significantly the accuracy of the on-wafer component modeling, when applied to parasitic effect removal associated with the excitation schemes....

  8. A structural dynamic factor model for the effects of monetary policy estimated by the EM algorithm

    DEFF Research Database (Denmark)

    Bork, Lasse

    This paper applies the maximum likelihood based EM algorithm to a large-dimensional factor analysis of US monetary policy. Specifically, economy-wide effects of shocks to the US federal funds rate are estimated in a structural dynamic factor model in which 100+ US macroeconomic and financial time...... series are driven by the joint dynamics of the federal funds rate and a few correlated dynamic factors. This paper contains a number of methodological contributions to the existing literature on data-rich monetary policy analysis. Firstly, the identification scheme allows for correlated factor dynamics...... as opposed to the orthogonal factors resulting from the popular principal component approach to structural factor models. Correlated factors are economically more sensible and important for a richer monetary policy transmission mechanism. Secondly, I consider both static factor loadings as well as dynamic...

  9. Distribution system modeling and analysis

    CERN Document Server

    Kersting, William H

    2002-01-01

    For decades, distribution engineers did not have the sophisticated tools developed for analyzing transmission systems-often they had only their instincts. Things have changed, and we now have computer programs that allow engineers to simulate, analyze, and optimize distribution systems. Powerful as these programs are, however, without a real understanding of the operating characteristics of a distribution system, engineers using the programs can easily make serious errors in their designs and operating procedures.Distribution System Modeling and Analysis helps prevent those errors. It gives re

  10. Stirling Engine Dynamic System Modeling

    Science.gov (United States)

    Nakis, Christopher G.

    2004-01-01

    The Thermo-Mechanical systems branch at the Glenn Research Center focuses a large amount time on Stirling engines. These engines will be used on missions where solar power is inefficient, especially in deep space. I work with Tim Regan and Ed Lewandowski who are currently developing and validating a mathematical model for the Stirling engines. This model incorporates all aspects of the system including, mechanical, electrical and thermodynamic components. Modeling is done through Simplorer, a program capable of running simulations of the model. Once created and then proven to be accurate, a model is used for developing new ideas for engine design. My largest specific project involves varying key parameters in the model and quantifying the results. This can all be done relatively trouble-free with the help of Simplorer. Once the model is complete, Simplorer will do all the necessary calculations. The more complicated part of this project is determining which parameters to vary. Finding key parameters depends on the potential for a value to be independently altered in the design. For example, a change in one dimension may lead to a proportional change to the rest of the model, and no real progress is made. Also, the ability for a changed value to have a substantial impact on the outputs of the system is important. Results will be condensed into graphs and tables with the purpose of better communication and understanding of the data. With the changing of these parameters, a more optimal design can be created without having to purchase or build any models. Also, hours and hours of results can be simulated in minutes. In the long run, using mathematical models can save time and money. Along with this project, I have many other smaller assignments throughout the summer. My main goal is to assist in the processes of model development, validation and testing.

  11. Development of engineering model of medium-sized aperture camera system

    Science.gov (United States)

    Kim, Ee-Eul; Choi, Young-Wan; Soon Yang, Ho; Kang, Myung-Seok; Jeong, Seong-Keun; Yang, Seung-Uk; Kim, Jong-Un; Rasheed, Ad. Aziz Ad.; Nasir, Hafizah Md.; Rosdi, Md. Rushdan Md.; Hai, Asma Hani Ad.; Ismail, Ismahadi; Sabirin Arshad, Ahmad

    2005-01-01

    SaTReC i and ATSB are developing medium-sized aperture camera (MAC) system for earth observation. Following the first model, the development of the engineering model (EM) was completed. The optical subsystem incorporates a conventional approach of using low-expansion optical and structural materials. It is a 300-mm on-axis system with two aspheric mirrors and two field correction lenses. It has five linear detectors aligned on its focal plane together with proximity electronics. The electronics subsystem consists of five modules; two for management and control in cold redundancy, two for image data storage and one for power supply. EM was developed to have a storage capacity of 16 Gbits, which can be easily increased to 32 Gbits by adding memory packs for following models. EM weighs about 41.9 kg and consumes about 45.4 W of peak power.

  12. Modelo de avaliação da gestão municipal para o planejamento em saúde Evaluation model for municipal health planning management

    Directory of Open Access Journals (Sweden)

    Isabel Quint Berretta

    2011-11-01

    Full Text Available Este artigo apresenta um modelo de avaliação da gestão municipal para o planejamento em saúde. Trata-se de pesquisa metodológica cuja construção da matriz avaliativa utilizou o referencial teórico de planejamento em saúde, a compreensão de organização e funcionamento delineado pelo PlanejaSUS e definições de responsabilidades para a área em nível municipal do Pacto de Gestão. Os indicadores e medidas foram validados por técnica de consenso, com especialistas em planejamento e avaliação. Sua aplicabilidade foi testada em 271 municípios de Santa Catarina, Brasil, considerando o porte populacional. O modelo proposto tem duas dimensões avaliativas, que refletem o compromisso do gestor municipal com o planejamento: a garantia de recursos e de relações internas e externas necessárias ao desenvolvimento das atividades. Os dados foram analisados com a utilização de indicadores, subdimensões e dimensões. Concluiu-se que o modelo é viável e adequado para avaliar o empenho da gestão municipal para o planejamento em saúde.This article presents an evaluation model for municipal health planning management. The basis was a methodological study using the health planning theoretical framework to construct the evaluation matrix, in addition to an understanding of the organization and functioning designed by the Planning System of the Unified National Health System (PlanejaSUS and definition of responsibilities for the municipal level under the Health Management Pact. The indicators and measures were validated using the consensus technique with specialists in planning and evaluation. The applicability was tested in 271 municipalities (counties in the State of Santa Catarina, Brazil, based on population size. The proposed model features two evaluative dimensions which reflect the municipal health administrator's commitment to planning: the guarantee of resources and the internal and external relations needed for developing the

  13. The effect of effective microorganisms (EM on EBPR in modified contact stabilization system

    Directory of Open Access Journals (Sweden)

    Ehab M. Rashed

    2015-12-01

    Full Text Available Excessive phosphorus can cause eutrophication in water bodies and needs to be reduced in most wastewaters before discharge to receiving waters. The enhanced biological phosphorus removal (EBPR process has been shown to be an economical and environmentally compatible method for reducing phosphorus from wastewaters. The experiment has been performed in order to investigate the effect of using effective microorganisms (EM as an application of Enhanced Biological Phosphorous Removal (EBPR in modified contact stabilization activated sludge system by using contact tank as a phosphorus uptake zone and using thickener tank as a phosphorus release zone. The study involved the construction of a pilot plant which was setup in the Quhafa Wastewater Treatment Plant (WWTP, Al Fayoum, Egypt. Then the uptake and release of total phosphorus were determined through two batch tests using sludge samples from thickener and stabilization tanks. Results showed the removal efficiencies of Chemical Oxygen Demand (COD, Biological Oxygen Demand (BOD5 and total phosphorus (TP of this pilot plant were 93%, 93% and 90%, respectively. On the other hand the results of batch tests showed that the reason for high ability of phosphorus removal by this pilot plant is related to the high performance of microorganisms for phosphorus accumulation. Finally providing activated EM to the anaerobic zone was to improve fermentation by achieving the enhancement of the performance of phosphorus accumulating organisms (PAOs and then increase phosphorous release resulting in the decrease of the average effluent phosphorus concentration.

  14. Ética da pesquisa em modelos animais Research ethics in animal models

    Directory of Open Access Journals (Sweden)

    Ivan Dieb Miziara

    2012-04-01

    Full Text Available A utilização de animais em experimentos científicos é descrita desde o século V a.C. Avanços científicos na área da saúde são atribuídos a modelos animais. O status moral dos animais sempre foi debatido. OBJETIVOS: Este artigo visa à revisão histórica e resumo da legislação atual, para orientar pesquisadores ao utilizar modelos animais na pesquisa em otorrinolaringologia. MATERIAL E MÉTODOS: Pesquisa na base de dados Medline. RESULTADOS: no Brasil, por muitos anos não havia regulamentação para o uso de animais em experimentação. Eram seguidas normas de organizações nacionais e internacionais. Recentemente, foi sancionada a lei nº 11.794/08, que estabelece procedimentos para o uso científico de animais. Na otorrinolaringologia, os estudos com laringe utilizaram coelho, porco, cachorro, cobaias (Cavia porcellus e camundongo; estudos para face coelho, rato e cachorro; rinoplastia com coelho; e orelha interna com ratos e cobaias (albinas. CONCLUSÕES: Os pesquisadores envolvidos em trabalhos científicos com animais devem conhecer os princípios da lei nº 11.794/08 e pesquisar quais animais são apropriados para cada subárea estudada seus modelos com maior aplicabilidade. Os otorrinolaringologistas, especialmente aqueles que se dedicam à pesquisa, necessitam estar sempre atentos para o respeito às regras éticas de utilização de animais em seus estudos.The use of animals in scientific experiments has beendescribed since the fifth century BC. A number of scientific advances in health are attributed to animal models. The issue of the moral status of animals has always been debated. OBJECTIVES: This article aims to review and to present a historical summary of the current laws, to guide researchers who wish to use animal models in otolaryngology research. MATERIAL AND METHODS: Research on the medline database. RESULTS: For many years there were no laws ruling the use of animals in scientific experimentation in Brazil

  15. Kinetic Modeling of Biological Systems

    Energy Technology Data Exchange (ETDEWEB)

    Resat, Haluk; Petzold, Linda; Pettigrew, Michel F.

    2009-04-21

    The dynamics of how its constituent components interact define the spatio-temporal response of a natural system to stimuli. Modeling the kinetics of the processes that represent a biophysical system has long been pursued with the aim of improving our understanding of the studied system. Due to the unique properties of biological systems, in addition to the usual difficulties faced in modeling the dynamics of physical or chemical systems, biological simulations encounter difficulties that result from intrinsic multiscale and stochastic nature of the biological processes. This chapter discusses the implications for simulation of models involving interacting species with very low copy numbers, which often occur in biological systems and give rise to significant relative fluctuations. The conditions necessitating the use of stochastic kinetic simulation methods and the mathematical foundations of the stochastic simulation algorithms are presented. How the well-organized structural hierarchies often seen in biological systems can lead to multiscale problems, and possible ways to address the encountered computational difficulties are discussed. We present the details of the existing kinetic simulation methods, and discuss their strengths and shortcomings. A list of the publicly available kinetic simulation tools and our reflections for future prospects are also provided.

  16. An experimental model for the transplantation of fetal central nervous system cells to the injured spinal cord in rats Modelo experimental de transplante de células do sistema nervoso central fetal para lesão de medula espinal em ratos

    Directory of Open Access Journals (Sweden)

    Tarcísio Eloy Pessoa de Barros Filho

    2002-01-01

    Full Text Available INTRODUCTION: Traumatic spinal cord injury is one of the most disabling conditions occurring in man and thus stimulates a strong interest in its histopathological, biochemical, and functional changes, primarily as we search for preventive and therapeutic methods. PURPOSE: To develop an experimental model for transplantation of cells from the fetal rat central nervous system to the site of an injured spinal cord of an adult rat in which the transplanted cells survive and become integrated. This experimental model will facilitate investigations of factors that promote regeneration and functional recovery after spinal cord trauma. MATERIAL AND METHODS: Fifteen adult Wistar rats underwent laminectomy, and an spinal cord lesion was made with microdissection. Fetal spinal cord tissue was then transplanted to the site of the injury. The rats were monitored over a 48-hour period, and then their vertebral column was completely removed for histological analysis. RESULTS: In 60% of transplanted rats, the fetal tissue at the injured site remained viable in the site of the lesion.INTRODUÇÃO: A lesão traumática da medula espinal consiste numa das mais incapacitantes lesões que o ser humano pode sofrer e tem despertado grande interesse no conhecimento das alterações histopatológicas, bioquímicas, funcionais e principalmente na busca de métodos de prevenção e tratamento. OBJETIVO: Propor um modelo experimental de transplante de células do sistema nervoso fetal de ratos para o sítio de lesão medular de ratos adultos que permitisse sua sobrevivência e integração para possibilitar protocolos de pesquisa para identificar outros fatores de regeneração e recuperação funcional pós trauma raquimedular. MATERIAL E MÉTODOS: Utilizaram-se 15 ratos adultos que foram submetidos a laminectomia e lesão de 5mm de hemimelula realizada com auxílio de microscópio óptico. Os ratos tiveram seu sítio de lesão medular transplantado com células do

  17. Genomics and genetics of <em>Sulfolobus islandicusem> LAL14/1, a model hyperthermophilic archaeon

    DEFF Research Database (Denmark)

    Jaubert, Carole; Danioux, Chloë; Oberto, Jacques;

    2013-01-01

    have developed a genetic system for S. islandicus LAL14/1 and created ¿pyrEF and ¿CRISPR_1 mutants using double cross-over and pop-in/pop-out approaches, respectively. Thus, LAL14/1 is a promising model to study virus-host interactions and the CRISPR/Cas defence mechanism in Archaea....... common core genome of approximately 2 Mb and a long hyperplastic region containing most of the strain-specific genes. In LAL14/1, the latter region is enriched in insertion sequences, CRISPR (clustered regularly interspaced short palindromic repeats), glycosyl transferase genes, toxin-antitoxin genes...... and MITE (miniature inverted-repeat transposable elements). The tRNA genes of LAL14/1 are preferential targets for the integration of mobile elements but clusters of atypical genes (CAG) are also integrated elsewhere in the genome. LAL14/1 carries five CRISPR loci with 10 per cent of spacers matching...

  18. Genomics and genetics of <em>Sulfolobus islandicusem> LAL14/1, a model hyperthermophilic archaeon

    DEFF Research Database (Denmark)

    Jaubert, Carole; Danioux, Chloë; Oberto, Jacques

    2013-01-01

    have developed a genetic system for S. islandicus LAL14/1 and created ¿pyrEF and ¿CRISPR_1 mutants using double cross-over and pop-in/pop-out approaches, respectively. Thus, LAL14/1 is a promising model to study virus-host interactions and the CRISPR/Cas defence mechanism in Archaea....... perfectly or imperfectly the genomes of archaeal viruses and plasmids found in the Icelandic hot springs. Strikingly, the CRISPR_2 region of LAL14/1 carries an unusually long 1.9 kb spacer interspersed between two repeat regions and displays a high similarity to pING1-like conjugative plasmids. Finally, we...

  19. Executive Information Systems' Multidimensional Models

    Directory of Open Access Journals (Sweden)

    2007-01-01

    Full Text Available Executive Information Systems are design to improve the quality of strategic level of management in organization through a new type of technology and several techniques for extracting, transforming, processing, integrating and presenting data in such a way that the organizational knowledge filters can easily associate with this data and turn it into information for the organization. These technologies are known as Business Intelligence Tools. But in order to build analytic reports for Executive Information Systems (EIS in an organization we need to design a multidimensional model based on the business model from the organization. This paper presents some multidimensional models that can be used in EIS development and propose a new model that is suitable for strategic business requests.

  20. Numerical Modeling of Microelectrochemical Systems

    DEFF Research Database (Denmark)

    Adesokan, Bolaji James

    for the reactants in the bulk electrolyte that are traveling waves. The first paper presents the mathematical model which describes an electrochemical system and simulates an electroanalytical technique called cyclic voltammetry. The model is governed by a system of advection–diffusion equations with a nonlinear...... reaction term at the boundary. We investigate the effect of flow rates, scan rates, and concentration on the cyclic voltammetry. We establish that high flow rates lead to the reduced hysteresis in the cyclic voltammetry curves and increasing scan rates lead to more pronounced current peaks. The final part...... of the paper shows that the response current in a cyclic voltammetry increases proportionally to the electrolyte concentration. In the second paper we present an experiment of an electrochemical system in a microfluidc system and compare the result to the numerical solutions. We investigate how the position...

  1. Modelo experimental de osteotomia em coelhos imaturos Expeimental model for osteotomy in immature rabbit

    Directory of Open Access Journals (Sweden)

    Marcos Almeida Matos

    2001-12-01

    Full Text Available Apresenta-se um modelo experimental de osteotomia de fíbula em coelhos com esqueleto imaturo adequado para o estudo do processo de reparação óssea. A osteotomia foi realizada por serra elétrica padronizada, sem utilização de dispositivos de fixação. Este modelo foi testado em cinco coelhos e constou da descrição detalhada de técnica operatória, anestesia e técnica radiográfica. Os animais foram submetidos a eutanásia após cinco semanas e tiveram suas fíbulas encaminhadas para avaliação histológica. Comprovou-se que o modelo é eficiente, simples e de fácil execução, tornando-se opção atraente para todos aqueles que desejam realizar estudos de consolidação óssea durante a imaturidade esquelética.Authors present an experimental model for fibular osteotomy in immature rabbits usefull to study healing bone process. Osteotomy was produced by means of eletric saw without utilization of fixing devices. This model was applied in five rabbit were sacrified after five weeks and had their fibular send for histological evaluation. Operative technique, anesthesia, roetigenografic technique were detailed discribed. The model was proved to be efficient, simple and of easy execution, becoming an atractive option for whoever wish to perform studies of bone healing through skeleon development.

  2. Nitrato e nitrito em leite produzido em sistemas convencional e orgânico Nitrate and nitrite in milk produced by conventional and organic systems

    Directory of Open Access Journals (Sweden)

    Joice S. dos Santos

    2005-06-01

    Full Text Available Nitratos e nitritos podem estar presentes naturalmente em diversos alimentos, entre eles o leite. Devido a sua toxicidade, são estabelecidos limites para a presença destes compostos nos alimentos. Assim, investigou-se os níveis de nitratos e nitritos em amostras de leite in natura, produzido por vacas submetidas aos sistemas de manejo convencional e orgânico. As amostras foram coletadas em propriedades da Região da Depressão Central do Rio Grande do Sul, Brasil. Os teores médios de nitrato e nitrito encontrados nas amostras (n=45 foram de 6,65±0,84mg/L e 1,76±0,17mg/L, respectivamente. O leite produzido no sistema orgânico apresentou 7,08mg/L de nitrato e 1,61mg/L de nitrito, enquanto o produzido no sistema convencional apresentou 6,36 e 1,87mg/L, respectivamente. Não foi observada diferença significativa entre os teores de nitrato e nitrito encontrados nas amostras de leite em função do sistema de produção avaliado, época de coleta, turno de ordenha ou local de origem, isto é, propriedade produtora.Nitrates and nitrites can be naturally found in many foods, including milk. Due to their toxicity there is a maximum level allowed for these compounds in foods. In the present study, nitrate and nitrite levels were evaluated in raw milk samples produced in conventional and organic systems. Samples were collected from farms of the Depressão Central of Rio Grande do Sul, Brazil. The average levels of nitrate and nitrite in samples (n=45 were 6.65±0.84mg/L and 1.76±0.17mg/L, respectively. Milk produced in the organic system exhibited 7.08mg/L nitrate and 1.61mg/L nitrite, while milk produced in the conventional system exhibited 6.36 and 1.87mg/L, respectively. Nitrate and nitrite levels in raw milk were not affected by the production system, the period of collection, milking shift or the site of production (farm.

  3. Quark Model and multiquark system

    CERN Document Server

    da Silva, Cristiane Oldoni

    2010-01-01

    The discovery of many particles, especially in the 50's, when the firsts accelerators appeared, caused the searching for a model that would describe in a simple form the whole of known particles. The Quark Model, based in the mathematical structures of group theory, provided in the beginning of the 60's a simplified description of hadronic matter already known, proposing that three particles, called quarks, would originate all the observed hadrons. This model was able to preview the existence of particles that were later detected, confirming its consistency. Extensions of the Quark Model were made in the beginning of the 70's, focusing in describing observed particles that were excited states of the fundamental particles and others that presented new quantum numbers (flavors). Recently, exotic states as tetraquarks and pentaquarks types, also called multiquarks systems, previewed by the model, were observed, what renewed the interest in the way as quarks are confined inside the hadrons. In this article we pre...

  4. A validation of ground ambulance pre-hospital times modeled using geographic information systems

    Directory of Open Access Journals (Sweden)

    Patel Alka B

    2012-10-01

    Full Text Available Abstract Background Evaluating geographic access to health services often requires determining the patient travel time to a specified service. For urgent care, many research studies have modeled patient pre-hospital time by ground emergency medical services (EMS using geographic information systems (GIS. The purpose of this study was to determine if the modeling assumptions proposed through prior United States (US studies are valid in a non-US context, and to use the resulting information to provide revised recommendations for modeling travel time using GIS in the absence of actual EMS trip data. Methods The study sample contained all emergency adult patient trips within the Calgary area for 2006. Each record included four components of pre-hospital time (activation, response, on-scene and transport interval. The actual activation and on-scene intervals were compared with those used in published models. The transport interval was calculated within GIS using the Network Analyst extension of Esri ArcGIS 10.0 and the response interval was derived using previously established methods. These GIS derived transport and response intervals were compared with the actual times using descriptive methods. We used the information acquired through the analysis of the EMS trip data to create an updated model that could be used to estimate travel time in the absence of actual EMS trip records. Results There were 29,765 complete EMS records for scene locations inside the city and 529 outside. The actual median on-scene intervals were longer than the average previously reported by 7–8 minutes. Actual EMS pre-hospital times across our study area were significantly higher than the estimated times modeled using GIS and the original travel time assumptions. Our updated model, although still underestimating the total pre-hospital time, more accurately represents the true pre-hospital time in our study area. Conclusions The widespread use of generalized EMS pre

  5. A validation of ground ambulance pre-hospital times modeled using geographic information systems.

    Science.gov (United States)

    Patel, Alka B; Waters, Nigel M; Blanchard, Ian E; Doig, Christopher J; Ghali, William A

    2012-10-03

    Evaluating geographic access to health services often requires determining the patient travel time to a specified service. For urgent care, many research studies have modeled patient pre-hospital time by ground emergency medical services (EMS) using geographic information systems (GIS). The purpose of this study was to determine if the modeling assumptions proposed through prior United States (US) studies are valid in a non-US context, and to use the resulting information to provide revised recommendations for modeling travel time using GIS in the absence of actual EMS trip data. The study sample contained all emergency adult patient trips within the Calgary area for 2006. Each record included four components of pre-hospital time (activation, response, on-scene and transport interval). The actual activation and on-scene intervals were compared with those used in published models. The transport interval was calculated within GIS using the Network Analyst extension of Esri ArcGIS 10.0 and the response interval was derived using previously established methods. These GIS derived transport and response intervals were compared with the actual times using descriptive methods. We used the information acquired through the analysis of the EMS trip data to create an updated model that could be used to estimate travel time in the absence of actual EMS trip records. There were 29,765 complete EMS records for scene locations inside the city and 529 outside. The actual median on-scene intervals were longer than the average previously reported by 7-8 minutes. Actual EMS pre-hospital times across our study area were significantly higher than the estimated times modeled using GIS and the original travel time assumptions. Our updated model, although still underestimating the total pre-hospital time, more accurately represents the true pre-hospital time in our study area. The widespread use of generalized EMS pre-hospital time assumptions based on US data may not be appropriate in a

  6. BALANCED SCORECARDS EVALUATION MODEL THAT INCLUDES ELEMENTS OF ENVIRONMENTAL MANAGEMENT SYSTEM USING AHP MODEL

    Directory of Open Access Journals (Sweden)

    Jelena Jovanović

    2010-03-01

    Full Text Available The research is oriented on improvement of environmental management system (EMS using BSC (Balanced Scorecard model that presents strategic model of measurem ents and improvement of organisational performance. The research will present approach of objectives and environmental management me trics involvement (proposed by literature review in conventional BSC in "Ad Barska plovi dba" organisation. Further we will test creation of ECO-BSC model based on business activities of non-profit organisations in order to improve envir onmental management system in parallel with other systems of management. Using this approach we may obtain 4 models of BSC that includ es elements of environmen tal management system for AD "Barska plovidba". Taking into acc ount that implementation and evaluation need long period of time in AD "Barska plovidba", the final choice will be based on 14598 (Information technology - Software product evaluation and ISO 9126 (Software engineering - Product quality using AHP method. Those standards are usually used for evaluation of quality software product and computer programs that serve in organisation as support and factors for development. So, AHP model will be bas ed on evolution criteria based on suggestion of ISO 9126 standards and types of evaluation from two evaluation teams. Members of team & will be experts in BSC and environmental management system that are not em ployed in AD "Barska Plovidba" organisation. The members of team 2 will be managers of AD "Barska Plovidba" organisation (including manage rs from environmental department. Merging results based on previously cr eated two AHP models, one can obtain the most appropriate BSC that includes elements of environmental management system. The chosen model will present at the same time suggestion for approach choice including ecological metrics in conventional BSC model for firm that has at least one ECO strategic orientation.

  7. Modelo de oposições múltiplas modificado: abordagem baseada em traços distintivos Modified multiple oppositions' model: approach based on distinctive features

    Directory of Open Access Journals (Sweden)

    Karina Carlesso Pagliarin

    2009-01-01

    Full Text Available O objetivo deste trabalho foi propor uma abordagem com enfoque em traços distintivos para o Modelo de Oposições Múltiplas e testar sua aplicação em um sujeito falante do Português Brasileiro. O Modelo foi aplicado em um sujeito do sexo masculino, com desvio fonológico moderado-severo e idade de seis anos e meio. Após avaliação fonológica, procedeu-se à seleção dos sons-alvo. Considerou-se o sistema fonológico inicial, bem como os traços distintivos alterados ([+voz], [+soante], [+aproximante], [coronal/±anterior], [-contínuo]. Os traços com maior número de alterações eram [+voz, +soante, +aproximante], justificando a escolha dos seguintes sons-alvo para tratamento: /r/ x /l/ x // x // x /z/, em onset medial.Tendo como base a aplicação desse modelo em falantes do inglês, percebeu-se a necessidade de introduzir alguns procedimentos, como: a escolha dos sons-alvo a partir dos traços distintivos alterados e a estrutura da sessão terapêutica. Ao final, o sujeito foi reavaliado a fim de verificar as aquisições no sistema fonológico. Após dez sessões de fonoterapia,o sujeito adquiriu os fonemas /l, , , z/, generalizando-os para outras posições na palavra (/Z/ e /l/ em onset inicial. Verificou-se, também, a ocorrência de generalização para a mesma classe e para outras classes de sons (/b/, /d/, /g/, /v/. No entanto, o fonema /r/ não foi adquirido. Esta proposta mostrou-se efetiva, pois o sujeito apresentou melhora em seu sistema fonológico com poucas sessões terapêuticas. Pôde-se observar que o Modelo de Oposições Múltiplas, utilizando a abordagem com base em traços distintivos é eficaz, pois favoreceu diversas mudanças fonológicas.The aim of this study was to propose an approach based on distinctive features for the Multiple Oppositions Model, and to test its application on a Brazilian Portuguese speaker. The model was used with a male subject with moderate-severe phonological disorder and six years

  8. GENERIC model for multiphase systems

    NARCIS (Netherlands)

    Sagis, L.M.C.

    2010-01-01

    GENERIC is a nonequilibrium thermodynamic formalism in which the dynamic behavior of a system is described by a single compact equation involving two types of brackets: a Poisson bracket and a dissipative bracket. This formalism has proved to be a very powerful instrument to model the dynamic behavi

  9. Brief Introduction of Nuclear Power Plant Emergency System EmInfoSys%核电站应急系统EmInfoSys简介

    Institute of Scientific and Technical Information of China (English)

    肖玉华; 赵志刚

    2014-01-01

    核安全是核能与核技术利用事业发展的生命线,核事故应急响应是核安全纵深防御的最后一道屏障,是确保核能事业安全健康发展的重要措施之一。建立功能齐全、反应灵敏、运转高效的核与辐射事故应急管理体系,是我国核安全中重要任务之一。北京广利核系统工程有限公司从2001年开始参与核应急指挥系统的建设,先后参与了秦山、田湾、环境保护部、海阳、台山、防城港、三门等大量的核应急项目,形成了拥有自主知识产权的核应急平台———EmInfoSys (Emergency Management Information System),本文对EmInfoSys系统做了简要介绍。%Nuclear safety is the lifeline of nuclear energy and nuclear technology ,nuclear accident emergency response is the last line of nuclear security defense ,and is one of the important measures to ensure the healthy development of the nuclear energy safety .T he establishment of complete function ,sensitive reaction and efficient emergency manage‐ment system for operation of nuclear and radiation accidents is an important task of nuclear security .From 2001 China Techenergy Co .,Ltd .participated in the Qinshan , Tianwan ,Ministry of Environmental Protection ,Haiyang ,Taishan ,Fangchenggang , Sanmen ,etc .nuclear emergency projects ,and the nuclear emergency EmInfoSys (emer‐gency management information system) platform was developed with independent intel‐lectual property rights .A brief introduction about EmInfoSys system was performed in this paper .

  10. Development of the electromagnetic tomography system. Field test results using existing equipment; EM tomography system no kaihatsu. Kison sochi ni yoru test sokutei kekka

    Energy Technology Data Exchange (ETDEWEB)

    Kumekawa, Y.; Miura, Y.; Takasugi, S. [Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan); Arai, E. [Metal Mining Agency of Japan, Tokyo (Japan)

    1996-05-01

    With the purpose of developing an electromagnetic tomography system, an observation was carried out with existing equipment combined, and the data was analyzed. The measuring equipment consisted of existing borehole vertical magnetic field sensors as the sensor part, MT method receivers as the receiving device, and existing CSMT method transmitters as the transmitting device. The measuring was performed at the Richmond Field Station which was abundant in existing data and which had a comparatively simple resistivity structure. The borehole vertical magnetic field sensors were lowered inside the borehole, and signal sources were arranged at 10m apart on the traverse line in the direction from northeast to southwest with the borehole as the center. The analysis of the data was made with the use of EM1D by three models, namely, 10 ohm{center_dot}m homogeneous earth model, 100 ohm{center_dot}m homogeneous earth model, and horizontal 7 layer model prepared on the basis of electric logging results; and a comparative examination was made against the measured data. As a result, it was demonstrated that the test measurement agreed very well with the model from the electric logging results and that it was the data reflecting a resistivity structure. 8 refs., 6 figs.

  11. Interface-Flattening Transform for EM Field Modeling in Tilted, Cylindrically-Stratified Geophysical Media

    CERN Document Server

    Sainath, Kamalesh

    2016-01-01

    We propose and investigate an "interface-flattening" transformation, hinging upon Transformation Optics (T.O.) techniques, to facilitate the rigorous analysis of electromagnetic (EM) fields radiated by sources embedded in tilted, cylindrically-layered geophysical media. Our method addresses the major challenge in such problems of appropriately approximating the domain boundaries in the computational model while, in a full-wave manner, predicting the effects of tilting in the layers. When incorporated into standard pseudo-analytical algorithms, moreover, the proposed method is quite robust, as it is not limited by absorption, anisotropy, and/or eccentering profile of the cylindrical geophysical formations, nor is it limited by the radiation frequency. These attributes of the proposed method are in contrast to past analysis methods for tilted-layer media that often place limitations on the source and medium characteristics. Through analytical derivations as well as a preliminary numerical investigation, we anal...

  12. Three-dimensional semi-idealized model for tidal motion in tidal estuaries. An application to the Ems estuary

    Science.gov (United States)

    Kumar, Mohit; Schuttelaars, Henk M.; Roos, Pieter C.; Möller, Matthias

    2016-01-01

    In this paper, a three-dimensional semi-idealized model for tidal motion in a tidal estuary of arbitrary shape and bathymetry is presented. This model aims at bridging the gap between idealized and complex models. The vertical profiles of the velocities are obtained analytically in terms of the first-order and the second-order partial derivatives of surface elevation, which itself follows from an elliptic partial differential equation. The surface elevation is computed numerically using the finite element method and its partial derivatives are obtained using various methods. The newly developed semi-idealized model allows for a systematic investigation of the influence of geometry and bathymetry on the tidal motion which was not possible in previously developed idealized models. The new model also retains the flexibility and computational efficiency of previous idealized models, essential for sensitivity analysis. As a first step, the accuracy of the semi-idealized model is investigated. To this end, an extensive comparison is made between the model results of the semi-idealized model and two other idealized models: a width-averaged model and a three-dimensional idealized model. Finally, the semi-idealized model is used to understand the influence of local geometrical effects on the tidal motion in the Ems estuary. The model shows that local convergence and meandering effects can have a significant influence on the tidal motion. Finally, the model is applied to the Ems estuary. The model results agree well with observations and results from a complex numerical model.

  13. Cotangent Models for Integrable Systems

    Science.gov (United States)

    Kiesenhofer, Anna; Miranda, Eva

    2017-03-01

    We associate cotangent models to a neighbourhood of a Liouville torus in symplectic and Poisson manifolds focusing on b-Poisson/ b-symplectic manifolds. The semilocal equivalence with such models uses the corresponding action-angle theorems in these settings: the theorem of Liouville-Mineur-Arnold for symplectic manifolds and an action-angle theorem for regular Liouville tori in Poisson manifolds (Laurent- Gengoux et al., IntMath Res Notices IMRN 8: 1839-1869, 2011). Our models comprise regular Liouville tori of Poisson manifolds but also consider the Liouville tori on the singular locus of a b-Poisson manifold. For this latter class of Poisson structures we define a twisted cotangent model. The equivalence with this twisted cotangent model is given by an action-angle theorem recently proved by the authors and Scott (Math. Pures Appl. (9) 105(1):66-85, 2016). This viewpoint of cotangent models provides a new machinery to construct examples of integrable systems, which are especially valuable in the b-symplectic case where not many sources of examples are known. At the end of the paper we introduce non-degenerate singularities as lifted cotangent models on b-symplectic manifolds and discuss some generalizations of these models to general Poisson manifolds.

  14. INTEGRATED HYDROGEN STORAGE SYSTEM MODEL

    Energy Technology Data Exchange (ETDEWEB)

    Hardy, B

    2007-11-16

    Hydrogen storage is recognized as a key technical hurdle that must be overcome for the realization of hydrogen powered vehicles. Metal hydrides and their doped variants have shown great promise as a storage material and significant advances have been made with this technology. In any practical storage system the rate of H2 uptake will be governed by all processes that affect the rate of mass transport through the bed and into the particles. These coupled processes include heat and mass transfer as well as chemical kinetics and equilibrium. However, with few exceptions, studies of metal hydrides have focused primarily on fundamental properties associated with hydrogen storage capacity and kinetics. A full understanding of the complex interplay of physical processes that occur during the charging and discharging of a practical storage system requires models that integrate the salient phenomena. For example, in the case of sodium alanate, the size of NaAlH4 crystals is on the order of 300nm and the size of polycrystalline particles may be approximately 10 times larger ({approx}3,000nm). For the bed volume to be as small as possible, it is necessary to densely pack the hydride particles. Even so, in packed beds composed of NaAlH{sub 4} particles alone, it has been observed that the void fraction is still approximately 50-60%. Because of the large void fraction and particle to particle thermal contact resistance, the thermal conductivity of the hydride is very low, on the order of 0.2 W/m-{sup o}C, Gross, Majzoub, Thomas and Sandrock [2002]. The chemical reaction for hydrogen loading is exothermic. Based on the data in Gross [2003], on the order of 10{sup 8}J of heat of is released for the uptake of 5 kg of H{sub 2}2 and complete conversion of NaH to NaAlH{sub 4}. Since the hydride reaction transitions from hydrogen loading to discharge at elevated temperatures, it is essential to control the temperature of the bed. However, the low thermal conductivity of the hydride

  15. Delphi type methodology to develop consensus on the future design of EMS systems in the United Kingdom

    OpenAIRE

    Hassan, T.; Barnett, D.

    2002-01-01

    Design: A Delphi questionnaire design with two rounds to gain a consensus of opinion. Investigation of four aspects of EMS design is reported—type of response to a priority based dispatch category, transportation options, enhancement of paramedic skills, and structure of a first responder system.

  16. Associations, causation and model in psychiatry Associações, causas e modelos em psiquiatria

    Directory of Open Access Journals (Sweden)

    Dorgival Caetano

    2009-01-01

    Full Text Available This paper discusses models, associations and causation in psychiatry. The different types of association (linear, positive, negative, exponential, partial, U shaped relationship, hidden and spurious between variables involved in mental disorders are presented as well as the use of multiple regression analysis to disentangle interrelatedness amongst multiple variables. A useful model should have internal consistency, external validity and predictive power; be dynamic in order to accommodate new sound knowledge; and should fit facts rather than they other way around. It is argued that whilst models are theoretical constructs they also convey a style of reasoning and can change clinical practice. Cause and effect are complex phenomena in that the same cause can yield different effects. Conversely, the same effect can have a different range of causes. In mental disorders and human behaviour there is always a chain of events initiated by the indirect and remote cause; followed by intermediate causes; and finally the direct and more immediate cause. Causes of mental disorders are grouped as those: (i which are necessary and sufficient; (ii which are necessary but not sufficient; and (iii which are neither necessary nor sufficient, but when present increase the risk for mental disorders.Este artigo discute modelos, associações e fatores causais em psiquiatria. Os diferentes tipos de associação (linear, positiva, negativa, exponencial, parcial, em forma de U, escondida e fortuita entre as variáveis envolvidas na ocorrência de transtornos mentais são apresentados, bem como o uso da análise de regressão múltipla para analisar covariâncias entre múltiplas variáveis. Um modelo, para ser útil, deve ter consistência interna, validade externa e poder preditivo, ser dinâmico para incorporar novas descobertas e adequar-se aos fatos, e não o contrário. Os modelos, embora sejam construtos teóricos, implicam em uma dada forma de pensar e t

  17. Probabilistic models for feedback systems.

    Energy Technology Data Exchange (ETDEWEB)

    Grace, Matthew D.; Boggs, Paul T.

    2011-02-01

    In previous work, we developed a Bayesian-based methodology to analyze the reliability of hierarchical systems. The output of the procedure is a statistical distribution of the reliability, thus allowing many questions to be answered. The principal advantage of the approach is that along with an estimate of the reliability, we also can provide statements of confidence in the results. The model is quite general in that it allows general representations of all of the distributions involved, it incorporates prior knowledge into the models, it allows errors in the 'engineered' nodes of a system to be determined by the data, and leads to the ability to determine optimal testing strategies. In this report, we provide the preliminary steps necessary to extend this approach to systems with feedback. Feedback is an essential component of 'complexity' and provides interesting challenges in modeling the time-dependent action of a feedback loop. We provide a mechanism for doing this and analyze a simple case. We then consider some extensions to more interesting examples with local control affecting the entire system. Finally, a discussion of the status of the research is also included.

  18. Modeling Advance Life Support Systems

    Science.gov (United States)

    Pitts, Marvin; Sager, John; Loader, Coleen; Drysdale, Alan

    1996-01-01

    Activities this summer consisted of two projects that involved computer simulation of bioregenerative life support systems for space habitats. Students in the Space Life Science Training Program (SLSTP) used the simulation, space station, to learn about relationships between humans, fish, plants, and microorganisms in a closed environment. One student complete a six week project to modify the simulation by converting the microbes from anaerobic to aerobic, and then balancing the simulation's life support system. A detailed computer simulation of a closed lunar station using bioregenerative life support was attempted, but there was not enough known about system restraints and constants in plant growth, bioreactor design for space habitats and food preparation to develop an integrated model with any confidence. Instead of a completed detailed model with broad assumptions concerning the unknown system parameters, a framework for an integrated model was outlined and work begun on plant and bioreactor simulations. The NASA sponsors and the summer Fell were satisfied with the progress made during the 10 weeks, and we have planned future cooperative work.

  19. Minisuperspace models of discrete systems

    CERN Document Server

    Baytaş, Bekir

    2016-01-01

    A discrete quantum spin system is presented in which several modern methods of canonical quantum gravity can be tested with promising results. In particular, features of interacting dynamics are analyzed with an emphasis on homogeneous configurations and the dynamical building-up and stability of long-range correlations. Different types of homogeneous minisuperspace models are introduced for the system, including one based on condensate states, and shown to capture different aspects of the discrete system. They are evaluated with effective methods and by means of continuum limits, showing good agreement with operator calculations whenever the latter are available. As a possibly quite general result, it is concluded that an analysis of the building-up of long-range correlations in discrete systems requires non-perturbative solutions of the dynamical equations. Some questions related to stability can be analyzed perturbatively, but suggest that matter couplings may be relevant for this question in the context o...

  20. The Control System Modeling Language

    CERN Document Server

    Zagar, K; Sekoranja, M; Tkacik, G; Vodovnik, A; Zagar, Klemen; Plesko, Mark; Sekoranja, Matej; Tkacik, Gasper; Vodovnik, Anze

    2001-01-01

    The well-known Unified Modeling Language (UML) describes software entities, such as interfaces, classes, operations and attributes, as well as relationships among them, e.g. inheritance, containment and dependency. The power of UML lies in Computer Aided Software Engineering (CASE) tools such as Rational Rose, which are also capable of generating software structures from visual object definitions and relations. UML also allows add-ons that define specific structures and patterns in order to steer and automate the design process. We have developed an add-on called Control System Modeling Language (CSML). It introduces entities and relationships that we know from control systems, such as "property" representing a single controllable point/channel, or an "event" specifying that a device is capable of notifying its clients through events. Entities can also possess CSML-specific characteristics, such as physical units and valid ranges for input parameters. CSML is independent of any specific language or technology...

  1. Contextual Modelling of Collaboration System

    Directory of Open Access Journals (Sweden)

    Wafaa DACHRY

    2012-03-01

    Full Text Available Faced with new environmental constraints, firms decide to collaborate in collective entities and adopt new patterns of behavior. So, this firms’ collaboration becomes an unavoidable approach. Indeed, our aim interest in our study is to propose a collaborative information system for supply chain. Our proposed platform ensures cooperation and information sharing between partners in real time. In fact, several questions have to be asked: What is the information nature may be shared between partners? What processes are implemented between actors? What functional services are supported by the platform? In order to answer these questions, we present, in this article, our methodological approach of modelling, called CMCS (Contextual Modelling of Collaborative System

  2. Stochastic Models of Polymer Systems

    Science.gov (United States)

    2016-01-01

    field limit of a dynamical model for polymer systems, Science China Mathematics , (11 2012): 0. doi: TOTAL: 1 Number of Non Peer-Reviewed Conference...4.0 (4.0 max scale): Number of graduating undergraduates funded by a DoD funded Center of Excellence grant for Education , Research and Engineering...undergraduates funded by your agreement who graduated during this period and will receive scholarships or fellowships for further studies in science

  3. Model reduction of parametrized systems

    CERN Document Server

    Ohlberger, Mario; Patera, Anthony; Rozza, Gianluigi; Urban, Karsten

    2017-01-01

    The special volume offers a global guide to new concepts and approaches concerning the following topics: reduced basis methods, proper orthogonal decomposition, proper generalized decomposition, approximation theory related to model reduction, learning theory and compressed sensing, stochastic and high-dimensional problems, system-theoretic methods, nonlinear model reduction, reduction of coupled problems/multiphysics, optimization and optimal control, state estimation and control, reduced order models and domain decomposition methods, Krylov-subspace and interpolatory methods, and applications to real industrial and complex problems. The book represents the state of the art in the development of reduced order methods. It contains contributions from internationally respected experts, guaranteeing a wide range of expertise and topics. Further, it reflects an important effor t, carried out over the last 12 years, to build a growing research community in this field. Though not a textbook, some of the chapters ca...

  4. Computational models of complex systems

    CERN Document Server

    Dabbaghian, Vahid

    2014-01-01

    Computational and mathematical models provide us with the opportunities to investigate the complexities of real world problems. They allow us to apply our best analytical methods to define problems in a clearly mathematical manner and exhaustively test our solutions before committing expensive resources. This is made possible by assuming parameter(s) in a bounded environment, allowing for controllable experimentation, not always possible in live scenarios. For example, simulation of computational models allows the testing of theories in a manner that is both fundamentally deductive and experimental in nature. The main ingredients for such research ideas come from multiple disciplines and the importance of interdisciplinary research is well recognized by the scientific community. This book provides a window to the novel endeavours of the research communities to present their works by highlighting the value of computational modelling as a research tool when investigating complex systems. We hope that the reader...

  5. Concentração e conteúdo de nutrientes em lisianto, cultivado em hidroponia, em sistema NFT = Concentration and nutrient content in lisianthus grown in a hydroponic NFT system

    Directory of Open Access Journals (Sweden)

    Fernanda Alice Antonello Londero Backes

    2008-10-01

    Full Text Available O diagnóstico nutricional é fundamental para determinar as exigências das plantas quanto aos nutrientes, de forma a se proceder a um manejo adequado, de acordo com a espécie. Assim, para determinar as concentrações e conteúdos nutricionais adequados à produção e qualidade de plantas de lisianto em cultivo hidropônico, instalou-se um experimento onde as plantas foram cultivadas em sistema NFT, em diferentes soluções nutritivas. O experimento foi conduzido, segundo delineamento experimental em blocos casualizados, em esquema fatorial 4x3, totalizando 12 tratamentos, com três repetições. Ostratamentos foram compostos de quatro cultivares (Echo Champagne, Mariachi Pure White, Balboa Yellow e Ávila Blue Rim e três soluções nutritivas (Teste, Steiner modificada e Barbosa. Foram avaliadas as concentrações e os conteúdos dos nutrientes nas folhas e conteúdos na parte aérea das plantas. As plantas cultivadas nas soluções Barbosa eTeste apresentaram resultados satisfatórios quanto às concentrações e aos conteúdos de nutrientes, enquanto a solução Steiner modificada produziu plantas com limitações nutricionais.The nutritional diagnosis is fundamental for determining plantnutrients, in order to correctly manage the nutritional requirements for each species. Thus, in order to determine the ideal nutrient amount and concentration for obtaining the best yield and quality of lisianthus grown hydroponically, an experiment was conducted inwhich the plants were grown under the NFT system in different nutrient solutions. The experiment was conducted according to a random block design arrangement in a 4x3 factorial scheme, totaling 12 treatments with three repetitions. The treatments werecomprised of four cultivars (Echo Champagne, Mariachi Pure White, Balboa Yellow and Ávila Blue Rim and three nutrient solutions (Test, modified Steiner and Barbosa. In the leaves, nutrient concentration and content were evaluated; in the aerial

  6. Cultivo de manjericão em hidroponia e em diferentes substratos sob ambiente protegido Culture of basil in substrata and hydroponic systems under protected environment

    Directory of Open Access Journals (Sweden)

    Priscila C. Fernandes

    2004-06-01

    Full Text Available Entre as ervas aromáticas, o manjericão possui importância econômica no Brasil, sendo seu consumo tanto in natura quanto para processamento industrial, na obtenção de óleo essencial. Porém, as informações quanto à qualidade aromática dessas plantas em função das técnicas de cultivo são escassas. Avaliou-se a produtividade de duas espécies de manjericão, de folha estreita (Ocimum minimum L. e de folha larga (Ocimum basilicum L. em ambiente protegido. Os sistemas de cultivo utilizados foram: 1 hidroponia (floating; 2 substrato preparado e 3 substrato comercial. As amostragens foram realizadas durante o período de florescimento das plantas. O experimento foi realizado em Campinas (SP, em casa de vegetação com controle de umidade e iluminação naturais, utilizando-se o delineamento inteiramente casualizado, com três repetições. Foram avaliados também o rendimento e composição química dos óleos essenciais das plantas. O sistema hidropônico apresentou a maior produtividade de massa verde, aproximadamente 44% superior aos outros dois tipos de cultivo, para ambas as espécies estudadas. Não houve diferença significativa entre as formas de cultivo quanto ao rendimento e composição química dos óleos essenciais dentro da mesma espécie. Quanto à produção de óleo essencial, as plantas de manjericão de folha estreita apresentaram rendimento aproximadamente 10% mais elevado em relação às de folha larga, além de diferenças significativas na composição dos óleos essenciais entre as espécies.Among the aromatical herbs, basil is of great economic importance in Brazil. This species is used as fresh herb and also for essential oil extraction. To evaluate the productivity of basil in protected environment, two species, Ocimum minimum L. (narrow leaf basil and Ocimum basilicum L. (wide leaf basil were cultivated under greenhouse conditions, using a hydroponic system and two types of substrata. The experiment was

  7. Experimental model of severe acute pancreatitis in rabbits Modelo experimental de pancreatite aguda grave em coelhos

    Directory of Open Access Journals (Sweden)

    Alberto Goldenberg

    2007-10-01

    Full Text Available PURPOSE: To develop an experimental model of severe acute pancreatitis in rabbits through a pancreatic ductal injection of sodium taurocholate. METHODS: Twenty-four albino rabbits of the New Zealand lineage were distributed into four groups of six animals (A, B, C and S. The rabbits of three experimental groups (A, B and C were submitted to a laparatomy and received a pancreatic ductal injection of 1ml/kg sodium taurocholate 5%. Also, they were submitted to further laparatomies after 4h, 8h and 12h, respectively. The control group (S was subdivided into two groups of three animals: in subgroup S1 only the pancreatic duct catheterization was performed whereas in subgroup S2 the pancreatic duct catheterization as well as an injection of 1ml/kg physiologic solution 0.9% were carried out. After 12 hours, the rabbits were evaluated. In the re-intervention, blood was collected to determine the amylasemia and a pancreatectomy was carried out to investigate interstitial infiltration, steatonecrosis and necrosis of the organ, using an optical microscope. RESULTS: There was an elevation of amylase in all groups thus proving the existence of acute pancreatitis. The size of the interlobular septum increased progressively with a greater variation between group S1 (0.13 and group C (0. 53 (p=0.035. While all the animals in group A exhibited focal cellular necrosis, it was more intense in the rabbits of group B and culminated with a high proportion of severe pancreatic necrosis in group C animals. The difference in the intensity of cellular necrosis showed statistic significance (p=0.001. CONCLUSION: The proposed experimental model demonstrated its reproducibility and effectiveness in producing severe acute pancreatitis in rabbits.OBJETIVO: Desenvolver modelo experimental de pancreatite aguda grave em coelhos por meio da injeção de taurocolato de sódio no ducto pancreático. MÉTODOS: Vinte e quatro coelhos albinos da linhagem Nova Zelândia foram distribu

  8. Modelo de tumor experimental em rim de ratos Experimental tumor model in rats kidney

    Directory of Open Access Journals (Sweden)

    Lúcio Flávio Gonzaga Silva

    2002-02-01

    Full Text Available O carcinossarcoma 256 de Walker tem despertado o interesse de muitos pesquisadores como modelo experimental para estudo da biologia tumoral. OBJETIVO: estabelecer um modelo de tumor renal que possa ser usado para estudar in vivo e in vitro, as alterações impostas pelas neoplasias. MÉTODOS: utilizados vinte ratos Wistar, machos, adultos, pesando entre 250-300 g, oriundos do Laboratório de Cirurgia Experimental da Universidade Federal do Ceará. Sob anestesia inalatória procedia-se uma pequena incisão supraumbilical, e com manobra delicada fazia-se a exposição do rim direito. Neste órgão eram inoculadas 3x10(5 células tumorais viáveis. Os animais então eram mantidos em gaiolas individuais com as mesmas condições ambientais e com água e dieta ad libitum. RESULTADOS: o Carcinossarcoma 256 de Walker, implantado no parênquima do rim direito de ratos Wistar apresentou índice de pega de 100%, e crescimento rápido, invadiu por contiguidade as estruturas vizinhas, porém sem apresentar metástases, no entanto, levando os animais a óbito no curso médio de 14 dias. CONCLUSÃO: o modelo de implante de tumor de Walker no parênquima do rim direito de ratos Wistar é eficiente, tem reprodutibilidade, apresentando um índice de pega de 100%, e permitindo seu uso em linhas de pesquisa.Walker carcinossarcoma 256 has a great interest as experimental model for studies on tumoral biology. OBJECTIVE: develop a kidney tumor model to be used in the evaluation of the biological behavior of neoplasms in vitro and in vivo environments. METHODS: twenty adult male Wistar rats weighting between 250-300 g were obtained from the Federal University of the Ceará Experimental Surgery Laboratory. Upon ether anesthesia, the right kidney of each animal was accessed through a supraumbelical incision and inoculated with a solution containing 3 x 10(5 tumor cells (Walker 256 carcinossarcoma tumor cells. Following anesthetic recovery the rats were returned to their

  9. Two-phase flow modelling of sediment suspension in the Ems/Dollard estuary

    Science.gov (United States)

    Xu, Chunyang; Dong, Ping

    2017-05-01

    Understanding and quantifying mud suspension and sediment transport processes are of great importance for effective exploitation and sustainable management of estuarine environments. Event-based predictive models are widely used to identify the key interactions and mechanisms that govern the dynamics involved and to provide the essential parameterisation for assessing the long-term morphodynamic evolution of the estuaries. This study develops a one-dimensional-vertical (1DV) Reynolds averaged two-phase model for cohesive sediments resuspension driven by tidal flows. To capture the time-dependent flocculation process more accurately, a new drag force closure which relates empirically to settling velocity of mud flocs with suspended sediment concentration (SSC) is incorporated into the two-phase model. The model is then applied to simulate mud suspension in the Ems/Dollard estuary during two periods (June and August 1996) of tidal forcing. Numerical predictions of bed shear stresses and sediment concentrations at different elevations above the bed are compared with measured variations. The results confirm the importance of including flocculation effects in calculating the settling velocity of mud flocs and demonstrates the sensitivity of prediction with the settling velocity in terms of flocs concentration. Although the two-phase modelling approach can in principle better capture the essential interactions between fluid and sediment phases, its practical advantages over the simpler single phase approach cannot be confirmed for the data periods simulated, partly because the overall suspended sediment concentration measured is rather low and the interaction between the two phases is weak and also because the uncertainties in the relationship between the settling velocity and flocs concentration.

  10. Identification and Modelling of Linear Dynamic Systems

    Directory of Open Access Journals (Sweden)

    Stanislav Kocur

    2006-01-01

    Full Text Available System identification and modelling are very important parts of system control theory. System control is only as good as good is created model of system. So this article deals with identification and modelling problems. There are simple classification and evolution of identification methods, and then the modelling problem is described. Rest of paper is devoted to two most known and used models of linear dynamic systems.

  11. Above-ground biomass models for Seabuckthorn (<em>Hippophae salicifoliaem>) in Mustang District, Nepal

    DEFF Research Database (Denmark)

    Rajchal, Rajesh; Meilby, Henrik

    2013-01-01

    weight of fruit and oven-dry weight of wood (stem and branches) and leaves were measured and used as a basis for developing biomass models. Diameters of the trees were measured at 30 cm above ground whereas the heights were measured in terms of the total tree height (m). Among several models tested...

  12. Simulating transmission and control of <em>Taenia soliumem> infections using a reed-frost stochastic model

    DEFF Research Database (Denmark)

    Kyvsgaard, Niels Chr.; Johansen, Maria Vang; Carabin, Hélène

    2007-01-01

    The transmission dynamics of the human-pig zoonotic cestode Taenia solium are explored with both deterministic and stochastic versions of a modified Reed-Frost model. This model, originally developed for microparasitic infections (i.e. bacteria, viruses and protozoa), assumes that random contacts...

  13. Padrão de política estatal em saúde e o sistema de assistência médica no Brasil atual The model of state health policy and the system of medical assistance adopted in present-day Brazil

    Directory of Open Access Journals (Sweden)

    Marcos de Souza Queiroz

    1992-04-01

    Full Text Available Pretende-se contribuir para a reflexão em torno da reforma sanitária em processo de implantação no Brasil. Defende-se o ponto de que para compreender os eventos mais recentes nessa área é necessário antes consolidar o referencial teórico que sustenta as conquistas já obtidas. Nesse sentido, a reforma sanitária é entendida como uma questão que transcende os aspectos referentes à administração e à gerência do sistema de saúde, uma vez que ela necessariamente envolve um redimensionamento crítico dos conceitos de saúde, de doença e, conseqüentemente, da prática médica definida pelo paradigma mecanicista dominante da medicina. Com esta preocupação, são analisados e criticados os eventos recentes que configuram o sistema de saúde brasileiro.A contribution to the analysis of the health reform presently occurring in Brazil is presented. The need to consolidate the theoretical background which supports the advances already achieved in order to understand recent events in the area is stressed. In this regard, the health reform is understood as a question transcending the mere administrative and managerial aspect of the health system, since it necessarily involves a redefinition of the concepts of health, disease and the medical practice adopted by the dominant mechanistic paradigm of medicine. The recent events which delineate the health system in Brazil are analysed and criticised in the light of this concern.

  14. Aplicação de modelo de simulação-otimização na gestão de perda de água em sistemas de abastecimento Leakage management with computational model in water supply system

    Directory of Open Access Journals (Sweden)

    Carlos César Gumier

    2007-03-01

    Full Text Available Este artigo apresenta a aplicação de modelo matemático-computacional de simulação e otimização para localização de fugas. O modelo proposto é fundamentado no acoplamento de um simulador hidráulico baseado no Time Marching Approach - TMA com o algoritmo otimizador de Nelder-Mead e foi aplicado em uma rede de distribuição de água da cidade de Jundiaí-SP. Nos testes realizados ficou claro o funcionamento adequado do modelo apresentado, pois a fuga simulada foi localizada, sendo observado, entretanto, a necessidade de um aprimoramento na localização dos pontos de monitoramento durante a execução da simulação.This work presents a computational model as a new tool for leak localization. The considered model was developed through the coupling of hydraulic simulator based in Time Marching Approach - TMA method with the Nelder-Mead optimization algorithm. The model was applied to a real water distribution network, in the city of Jundiaí, Brazil. In the carried through tests it was clearly the adequate functioning of the presented model, therefore the simulated escape was located, being observed, however, the necessity of an improvement in the localization of the monitor points, during the execution of the simulation.

  15. Using an EM Covariance Matrix to Estimate Structural Equation Models with Missing Data: Choosing an Adjusted Sample Size to Improve the Accuracy of Inferences

    Science.gov (United States)

    Enders, Craig K.; Peugh, James L.

    2004-01-01

    Two methods, direct maximum likelihood (ML) and the expectation maximization (EM) algorithm, can be used to obtain ML parameter estimates for structural equation models with missing data (MD). Although the 2 methods frequently produce identical parameter estimates, it may be easier to satisfy missing at random assumptions using EM. However, no…

  16. ISSM: Ice Sheet System Model

    Science.gov (United States)

    Larour, Eric; Schiermeier, John E.; Seroussi, Helene; Morlinghem, Mathieu

    2013-01-01

    In order to have the capability to use satellite data from its own missions to inform future sea-level rise projections, JPL needed a full-fledged ice-sheet/iceshelf flow model, capable of modeling the mass balance of Antarctica and Greenland into the near future. ISSM was developed with such a goal in mind, as a massively parallelized, multi-purpose finite-element framework dedicated to ice-sheet modeling. ISSM features unstructured meshes (Tria in 2D, and Penta in 3D) along with corresponding finite elements for both types of meshes. Each finite element can carry out diagnostic, prognostic, transient, thermal 3D, surface, and bed slope simulations. Anisotropic meshing enables adaptation of meshes to a certain metric, and the 2D Shelfy-Stream, 3D Blatter/Pattyn, and 3D Full-Stokes formulations capture the bulk of the ice-flow physics. These elements can be coupled together, based on the Arlequin method, so that on a large scale model such as Antarctica, each type of finite element is used in the most efficient manner. For each finite element referenced above, ISSM implements an adjoint. This adjoint can be used to carry out model inversions of unknown model parameters, typically ice rheology and basal drag at the ice/bedrock interface, using a metric such as the observed InSAR surface velocity. This data assimilation capability is crucial to allow spinning up of ice flow models using available satellite data. ISSM relies on the PETSc library for its vectors, matrices, and solvers. This allows ISSM to run efficiently on any parallel platform, whether shared or distrib- ISSM: Ice Sheet System Model NASA's Jet Propulsion Laboratory, Pasadena, California uted. It can run on the largest clusters, and is fully scalable. This allows ISSM to tackle models the size of continents. ISSM is embedded into MATLAB and Python, both open scientific platforms. This improves its outreach within the science community. It is entirely written in C/C++, which gives it flexibility in its

  17. Integrated Modeling for Flood Hazard Mapping Using Watershed Modeling System

    National Research Council Canada - National Science Library

    Seyedeh S. Sadrolashrafi; Thamer A. Mohamed; Ahmad R.B. Mahmud; Majid K. Kholghi; Amir Samadi

    2008-01-01

    ...) with the Watershed Modeling System (WMS) for flood modeling is developed. It also interconnects the terrain models and the GIS software, with commercial standard hydrological and hydraulic models, including HEC-1, HEC-RAS, etc...

  18. Determination of optimal collimation parameters for a rotating slat collimator system: a system matrix method using ML-EM

    Science.gov (United States)

    Boisson, F.; Bekaert, V.; Brasse, D.

    2016-03-01

    Nowadays, Single Photon imaging has become an essential part of molecular imaging and nuclear medicine. Whether to establish a diagnosis or in the therapeutic monitoring, this modality presents performance that continues to improve. For over 50 years, several collimators have been proposed. Mainly governed by collimation parameters, the resolution-sensitivity trade-off is the factor determining the collimator the most suitable for an intended study. One alternative to the common approaches is the rotating slat collimator (RSC). In the present study, we are aiming at developing a preclinical system equipped with a RSC dedicated to mice and rats imaging, which requires both high sensitivity and spatial resolution. We investigated the resolution-sensitivity trade-offs obtained by varying different collimation parameters: (i) the slats height (H), and (ii) the gap between two consecutive slats (g), considering different intrinsic spatial resolutions. One system matrix was generated for each set of collimation parameters (H,g). Spatial resolutions, Signal-to-Noise Ratio (SNR) and sensitivity obtained for all the set of collimation parameters (H,g) were measured in the 2D projections reconstructed with ML-EM. According to our results, 20 mm high slats and a 1 mm gap were chosen as a good RSC candidate for a preclinical detection module. This collimator will ensure a sensitivity greater than 0.2% and a system spatial resolution below 1 mm, considering an intrinsic spatial resolution below 0.8 mm.

  19. Network models in anatomical systems.

    Science.gov (United States)

    Esteve-Altava, Borja; Marugán-Lobón, Jesús; Botella, Héctor; Rasskin-Gutman, Diego

    2011-01-01

    Network theory has been extensively used to model the underlying structure of biological processes. From genetics to ecology, network thinking is changing our understanding of complex systems, specifically how their internal structure determines their overall behavior. Concepts such as hubs, scale-free or small-world networks, common in the complexity literature, are now used more and more in sociology, neurosciences, as well as other anthropological fields. Even though the use of network models is nowadays so widely applied, few attempts have been carried out to enrich our understanding in the classical morphological sciences such as in comparative anatomy or physical anthropology. The purpose of this article is to introduce the usage of network tools in morphology; specifically by building anatomical networks, dealing with the most common analyses and problems, and interpreting their outcome.

  20. Thermodynamic modeling of complex systems

    DEFF Research Database (Denmark)

    Liang, Xiaodong

    Offshore reservoirs represent one of the major growth areas of the oil and gas industry, and environmental safety is one of the biggest challenges for the offshore exploration and production. The oil accidents in the Gulf of Mexico in 1979 and 2010 were two of the biggest disasters in history...... after an oil spill. Engineering thermodynamics could be applied in the state-of-the-art sonar products through advanced artificial technology, if the speed of sound, solubility and density of oil-seawater systems could be satisfactorily modelled. The addition of methanol or glycols into unprocessed well...

  1. Models for Gaze Tracking Systems

    Directory of Open Access Journals (Sweden)

    Villanueva Arantxa

    2007-01-01

    Full Text Available One of the most confusing aspects that one meets when introducing oneself into gaze tracking technology is the wide variety, in terms of hardware equipment, of available systems that provide solutions to the same matter, that is, determining the point the subject is looking at. The calibration process permits generally adjusting nonintrusive trackers based on quite different hardware and image features to the subject. The negative aspect of this simple procedure is that it permits the system to work properly but at the expense of a lack of control over the intrinsic behavior of the tracker. The objective of the presented article is to overcome this obstacle to explore more deeply the elements of a video-oculographic system, that is, eye, camera, lighting, and so forth, from a purely mathematical and geometrical point of view. The main contribution is to find out the minimum number of hardware elements and image features that are needed to determine the point the subject is looking at. A model has been constructed based on pupil contour and multiple lighting, and successfully tested with real subjects. On the other hand, theoretical aspects of video-oculographic systems have been thoroughly reviewed in order to build a theoretical basis for further studies.

  2. Models for Gaze Tracking Systems

    Directory of Open Access Journals (Sweden)

    Arantxa Villanueva

    2007-10-01

    Full Text Available One of the most confusing aspects that one meets when introducing oneself into gaze tracking technology is the wide variety, in terms of hardware equipment, of available systems that provide solutions to the same matter, that is, determining the point the subject is looking at. The calibration process permits generally adjusting nonintrusive trackers based on quite different hardware and image features to the subject. The negative aspect of this simple procedure is that it permits the system to work properly but at the expense of a lack of control over the intrinsic behavior of the tracker. The objective of the presented article is to overcome this obstacle to explore more deeply the elements of a video-oculographic system, that is, eye, camera, lighting, and so forth, from a purely mathematical and geometrical point of view. The main contribution is to find out the minimum number of hardware elements and image features that are needed to determine the point the subject is looking at. A model has been constructed based on pupil contour and multiple lighting, and successfully tested with real subjects. On the other hand, theoretical aspects of video-oculographic systems have been thoroughly reviewed in order to build a theoretical basis for further studies.

  3. Area Logistics System Based on System Dynamics Model

    Institute of Scientific and Technical Information of China (English)

    GUI Shouping; ZHU Qiang; LU Lifang

    2005-01-01

    At present, there are few effective ways to analyze area logistics systems. This paper uses system dynamics to analyze the area logistics system and establishes a system dynamics model for the area logistics system based on the characteristics of the area logistics system and system dynamics. Numerical simulations with the system dynamic model were used to analyze a logistic system. Analysis of the Guangzhou economy shows that the model can reflect the actual state of the system objectively and can be used to make policy and harmonize environment.

  4. Gross margin losses due to <em>Salmonella> Dublin infection in Danish dairy cattle herds estimated by simulation modelling

    DEFF Research Database (Denmark)

    Nielsen, Torben Dahl; Kudahl, Anne Braad; Østergaard, S.

    2013-01-01

    and dynamic simulation model. The model incorporated six age groups (neonatal, pre-weaned calves, weaned calves, growing heifers, breeding heifers and cows) and five infection stages (susceptible, acutely infected, carrier, super shedder and resistant). The effects of introducing one S. Dublin infectious...... losses. This was more influential in the poorer management scenarios due to increased number of infected cows. The results can be used to inform dairy farmers of the benefits of preventing introduction and controlling spread of S. Dublin. Furthermore, they can be used in cost-benefit analyses of control...

  5. Complexação de íons de metais por matéria orgânica dissolvida: modelagem e aplicação em sistemas reais Complexation of metal ions by dissolved organic matter: modeling and application to real systems

    Directory of Open Access Journals (Sweden)

    Paulo Sérgio Silva Bezerra

    2009-09-01

    áticos, observou-se que o rio com maior concentração de COD (rio Bacanga apresentou maior capacidade de complexação; entretanto, a ordem foi Pb(II > Cu(II > Cd(II provavelmente devido à presença de íons Cu(II em maior quantidade nas águas dos rios.Metal ions are known by their physiological and industrial importance as well as by their environmental risk aspects. To elucidate the behavior of these elements in superficial water bodies, it is necessary to understand the various occurring interactions, mainly those related to the chemical speciation. One of the most important processes that metal species undergo in natural aquatic bodies is their interaction with dissolved organic matter (DOM, which can happen through adsorption, ionic exchange and complexation. In this work, laboratory experiments with Cu(II, Pb(II and Cd(II ions and commercial humic acid were made under various conditions (ionic strength and buffering to test the van den Berg and Kramer complexation model. After the simulation, the model was used to determine the Cu(II, Pb(II and Cd(II complexation capacity of natural waters from three important rivers in the state of Maranhao, Brazil (Itapecuru, Bacanga and Pericuma rivers. The dissolved organic carbon (DOC concentration was used to express the DOM concentration. The results confirmed that there is a strong interaction between the DOM and metal ions, and that the van den Berg and Kramer model (with one coordination site is suitable for estimating the complexation constant (K and the ligand site concentration (Lt. The simulated water samples used in the laboratory showed the complexation order: Cu(II > Cd(II > Pb(II; and the complexation capacity was directly proportional to the humic acid concentration. We believe that the smaller Cu(II ionic radius yields a stronger affinity with the DOM. In the experiments with natural waters, the river with more DOC (Bacanga river showed better complexation capacity; however, the order was Pb(II > Cu(II > Cd(II probably

  6. Enterprise Modelling supported by Manufacturing Systems Theory

    OpenAIRE

    MYKLEBUST, Odd

    2002-01-01

    There exist today a large number of enterprise models or enterprise modelling approaches. In a study of standards and project developed models there are two approaches: CIMOSA “The Open Systems Architecture for CIM” and GERAM, “Generalised Enterprise Reference Architecture”, which show a system orientation that can be further followed as interesting research topics for a system theory oriented approach for enterprise models. In the selection of system theories, manufacturing system theory...

  7. Above-ground biomass models for Seabuckthorn (<em>Hippophae salicifoliaem>) in Mustang District, Nepal

    DEFF Research Database (Denmark)

    Rajchal, Rajesh; Meilby, Henrik

    2013-01-01

    Seabuckthorn (Hippophae salicifolia D. Don.), an important multi-purpose tree, is found at altitudes of 2000–3600 m amsl in Nepal, but so far no models have been developed for estimating the biomass of this species, thus hampering resource assessment and management planning. Hence, the objective...

  8. APLICAÇÃO DA METODOLOGIA SOFT SYSTEMS PARA ESTRUTURAR PROBLEMAS EM UM CURSO DE GRADUAÇÃO

    Directory of Open Access Journals (Sweden)

    SANDRO GUSTAVO SOUSA SANTOS

    2016-12-01

    Full Text Available O objetivo deste trabalho é aplicar a metodologia Soft Systems para estruturar problemas reais do curso de graduação em Engenharia de Produção da Universidade Estadual do Maranhão no município de São Luís-MA. A metodologia embora ainda pouca utilizada no Brasil, mostra-se uma útil ferramenta para identificação de problemas com o intuito de gerar a aprendizagem através da reflexão sobre a situação em estudo. Assim, durante o desenvolvimento do trabalho buscou-se a participação dos atores do sistema em estudo (professores, alunos e gestão do curso para melhor compreender o próprio sistema através de suas percepções de mundo e experiências.. Dessa forma, o presente estudo apresentou aplicabilidade da metodologia e sua contribuição para a aprendizagem do sistema em estudo para discentes, docentes e gestão do curso através do enfoque sistêmico.

  9. WMS - Warehouse Management System: Benfeitorias Proporcionadas pela Implantação em um Centro Distribuidor e Atacadista

    Directory of Open Access Journals (Sweden)

    Lévistone Fávero

    2016-08-01

    Full Text Available Atualmente as empresas estão inseridas em ambientes altamente dinâmicos e competitivos, onde a gestão de estoque se torna uma vantagem frente aos concorrentes, quando a organização utiliza sistemas especialistas de gerenciamento de armazéns que subsidiam o processo de tomada de decisão. O estudo busca descrever as benfeitorias proporcionadas pela implantação de um sistema WMS (WAREHOUSE MANAGEMENT SYSTEM de gerenciamento de armazéns, em um centro distribuidor e atacadista do segmento de higiene pessoal e limpeza em Cordilheira Alta/SC. Na metodologia, optou-se por uma pesquisa descritiva por meio de estudo de caso qualitativo básico, com abordagem qualitativa dos dados. Os resultados apontam que a implantação do WMS trouxe resultados positivos para o processo decisório da organização, além de acarretar mudanças perceptíveis nas rotinas realizadas no centro de distribuição que demonstram a eficiência em receber, alocar, separar, embalar e expedir produtos de forma segura para atender com eficiência os pedidos dos clientes.

  10. Modeling learning technology systems as business systems

    NARCIS (Netherlands)

    Avgeriou, Paris; Retalis, Symeon; Papaspyrou, Nikolaos

    2003-01-01

    The design of Learning Technology Systems, and the Software Systems that support them, is largely conducted on an intuitive, ad hoc basis, thus resulting in inefficient systems that defectively support the learning process. There is now justifiable, increasing effort in formalizing the engineering o

  11. Modeling learning technology systems as business systems

    NARCIS (Netherlands)

    Avgeriou, Paris; Retalis, Symeon; Papaspyrou, Nikolaos

    2003-01-01

    The design of Learning Technology Systems, and the Software Systems that support them, is largely conducted on an intuitive, ad hoc basis, thus resulting in inefficient systems that defectively support the learning process. There is now justifiable, increasing effort in formalizing the engineering

  12. A structural equation modelling approach to predicting adoption of a patient-handling intervention developed for EMS providers.

    Science.gov (United States)

    Weiler, Monica R; Lavender, Steven A; Crawford, J Mac; Reichelt, Paul A; Conrad, Karen M; Browne, Michael W

    2013-01-01

    Patient-handling tasks are integral to Emergency Medical Service (EMS) work as are the musculoskeletal injuries associated with these tasks. The aim of this study was to develop and test a structural equation model that describes the interactions between previously identified factors that contribute to the adoption of a specific ergonomics intervention designed for EMS work. EMS responders (n = 187), from six different organisations, participated in a 2-month longitudinal study following the introduction of a foldable patient transfer-board (slide-board) designed to assist with lateral patient transfers. Surveys administered at baseline, after 1 month and after 2 months sampled factors potentially influencing EMS responders' adoption decisions. Perceived ergonomics advantage, which was influenced by access and storage concerns and prior tool experience, contributed most strongly to intention to use at the end of the first month and to the emergence of champions, which contributed to the intention to use at the end of the second month.

  13. Environmental Management Systems (EMS ISO 14001 Implementation in Construction Industry: A Malaysian Case Study

    Directory of Open Access Journals (Sweden)

    Sumiani Yusoff

    2015-03-01

    Full Text Available This study seeks to explore the crucial part in EMS implementation; i.e. environmental aspects and impacts, Good Environmental Practice to be developed in construction site, as well as the level of awareness or understanding amongst site staffs on ISO 14001 EMS implementation in their organizations. Data were collected via interviews, surveys and site visits. A number of environmental aspects and impacts, and Good Environmental Practices based on ISO 14001:2004 have been identified. The level of understanding of the site staffs on ISO 14001 EMS requirements has been found to be good except for matters concerning Schedule Waste Management. In conclusion, the successful implementation of ISO 14001 EMS mainly depends on staffs‘ understanding.

  14. Nonlinear System Identification and Behavioral Modeling

    CERN Document Server

    Huq, Kazi Mohammed Saidul; Kabir, A F M Sultanul

    2010-01-01

    The problem of determining a mathematical model for an unknown system by observing its input-output data pair is generally referred to as system identification. A behavioral model reproduces the required behavior of the original analyzed system, such as there is a one-to-one correspondence between the behavior of the original system and the simulated system. This paper presents nonlinear system identification and behavioral modeling using a work assignment.

  15. EM modeling of far-field radiation patterns for antennas on the GMA-TT UAV

    Science.gov (United States)

    Mackenzie, Anne I.

    2015-05-01

    To optimize communication with the Generic Modular Aircraft T-Tail (GMA-TT) unmanned aerial vehicle (UAV), electromagnetic (EM) simulations have been performed to predict the performance of two antenna types on the aircraft. Simulated far-field radiation patterns tell the amount of power radiated by the antennas and the aircraft together, taking into account blockage by the aircraft as well as radiation by conducting and dielectric portions of the aircraft. With a knowledge of the polarization and distance of the two communicating antennas, e.g. one on the UAV and one on the ground, and the transmitted signal strength, a calculation may be performed to find the strength of the signal travelling from one antenna to the other and to check that the transmitted signal meets the receiver system requirements for the designated range. In order to do this, the antenna frequency and polarization must be known for each antenna, in addition to its design and location. The permittivity, permeability, and geometry of the UAV components must also be known. The full-wave method of moments solution produces the appropriate dBi radiation pattern in which the received signal strength is calculated relative to that of an isotropic radiator.

  16. EM Modeling of Far-Field Radiation Patterns for Antennas on the GMA-TT UAV

    Science.gov (United States)

    Mackenzie, Anne I.

    2015-01-01

    To optimize communication with the Generic Modular Aircraft T-Tail (GMA-TT) unmanned aerial vehicle (UAV), electromagnetic (EM) simulations have been performed to predict the performance of two antenna types on the aircraft. Simulated far-field radiation patterns tell the amount of power radiated by the antennas and the aircraft together, taking into account blockage by the aircraft as well as radiation by conducting and dielectric portions of the aircraft. With a knowledge of the polarization and distance of the two communicating antennas, e.g. one on the UAV and one on the ground, and the transmitted signal strength, a calculation may be performed to find the strength of the signal travelling from one antenna to the other and to check that the transmitted signal meets the receiver system requirements for the designated range. In order to do this, the antenna frequency and polarization must be known for each antenna, in addition to its design and location. The permittivity, permeability, and geometry of the UAV components must also be known. The full-wave method of moments solution produces the appropriate dBi radiation pattern in which the received signal strength is calculated relative to that of an isotropic radiator.

  17. Energy demand in solar home systems; Demanda energetica em solar home systems

    Energy Technology Data Exchange (ETDEWEB)

    Trigoso, Federico Morante

    2000-07-01

    The central objective of this work is to understand the relationships between the energy demand and technical, economic, social and cultural factors that could influence it. For this a field research was established with the inclusion of 18 families distributed in four communities located in the South Coast of the Vale da Ribeira, Vale da Ribeira. The energy consumption of these families was measured along more than one year and, to facilitate its execution, it was necessary to develop an equipment capable to supply the daily consumption in units of Ampere-hour. This instrument was coupled to the photovoltaic systems in those communities and, besides, it was materialized a methodology of data obtaining that includes the users participation. The obtaining of data manually sought to provide an inter-relationship among the system, the user and the researcher with the purpose of, besides the data purely technicians, to obtain social and cultural information related with the energy uses. Through this methodology it was possible to verify that the energy demand is related with a series of factors that escape from the previous context. It was verified that the social and cultural behavior of the peoples will be reflected overall in the photovoltaic systems operation. The master thesis shows ways to deep in those studies that will be helpful to design methodology that includes all the parameters involved, still ignored. (author)

  18. A View of Earth System Model Development

    Institute of Scientific and Technical Information of China (English)

    ZHOU Tianjun; YU Yongqiang; WANG Bin

    2009-01-01

    This paper gives a definition of earth system model and shows three development phases of it, including physical climate system model, earth climate system model, and earth system model, based on an inves-tigation of climate system models in the world. It provides an expatiation on the strategic significance of future development of earth system model, an introduction of some representative scientific research plans on development of earth system model home and abroad, and a review of its status and trends based on the models of the fourth assessment report (AR4) of the Intergovernmental Panel on Climate Change (IPCC).Some suggestions on future development of earth system model in China are given, which are expected to be helpful to advance the development.

  19. FMRFamide-like immunoreactivity in the central nervous system of the cephalopod mollusc, <em>Idiosepius notoidesem>

    DEFF Research Database (Denmark)

    Wollesen, Tim; Loesel, R.; Wanninger, Andreas Wilhelm Georg

    2008-01-01

    For more than a century, cephalopod molluscs have been the subject of extensive studies with respect to their complex neuroanatomy and behavior. In comparison to gastropod molluscs surprisingly little work has been carried out on the characterization of neurons in the central nervous system (CNS......) of cephalopods with respect to their neurotransmitter phenotypes. This study presents preliminary results on the distribution of FMRFamide-like immunoreactive neurons within the CNS of the pygmy squid Idiosepius notoides . Its gross neuroanatomy resembles that of other cephalopods. FMRFamide...

  20. Optomechanics of Nanoparticles: Effect of Quantum Fluctuations in Levitating EM Field on Cavity-assisted and Cavity-less Systems

    CERN Document Server

    Jazayeri, Amir M

    2016-01-01

    Optomechanics of nanoparticles purports to reach the quantum regime, but experimental evidence suggests otherwise. We believe that the discrepancy is due to the omission of the deleterious effects of the EM field levitating the particle. This letter focuses on quantum fluctuations in the levitating field. In a cavity-assisted system, they lead to fluctuations in the gradient force, and encourage escape of the particle. In a feedback system, they lead to the detector shot noise besides fluctuations in the gradient force and radiation pressure, and render the system very vulnerable to the thermal noise of the feedback circuit.

  1. System identification application using Hammerstein model

    Indian Academy of Sciences (India)

    SABAN OZER; HASAN ZORLU; SELCUK METE

    2016-06-01

    Generally, memoryless polynomial nonlinear model for nonlinear part and finite impulse response (FIR) model or infinite impulse response model for linear part are preferred in Hammerstein models in literature. In this paper, system identification applications of Hammerstein model that is cascade of nonlinear second order volterra and linear FIR model are studied. Recursive least square algorithm is used to identify the proposed Hammerstein model parameters. Furthermore, the results are compared to identify the success of proposed Hammerstein model and different types of models

  2. Direct 4D parametric imaging for linearized models of reversibly binding PET tracers using generalized AB-EM reconstruction

    Science.gov (United States)

    Rahmim, Arman; Zhou, Yun; Tang, Jing; Lu, Lijun; Sossi, Vesna; Wong, Dean F.

    2012-02-01

    Due to high noise levels in the voxel kinetics, development of reliable parametric imaging algorithms remains one of most active areas in dynamic brain PET imaging, which in the vast majority of cases involves receptor/transporter studies with reversibly binding tracers. As such, the focus of this work has been to develop a novel direct 4D parametric image reconstruction scheme for such tracers. Based on a relative equilibrium (RE) graphical analysis formulation (Zhou et al 2009b Neuroimage 44 661-70), we developed a closed-form 4D EM algorithm to directly reconstruct distribution volume (DV) parametric images within a plasma input model, as well as DV ratio (DVR) images within a reference tissue model scheme (wherein an initial reconstruction was used to estimate the reference tissue time-activity curves). A particular challenge with the direct 4D EM formulation is that the intercept parameters in graphical (linearized) analysis of reversible tracers (e.g. Logan or RE analysis) are commonly negative (unlike for irreversible tracers, e.g. using Patlak analysis). Subsequently, we focused our attention on the AB-EM algorithm, derived by Byrne (1998, Inverse Problems 14 1455-67) to allow inclusion of prior information about the lower (A) and upper (B) bounds for image values. We then generalized this algorithm to the 4D EM framework, thus allowing negative intercept parameters. Furthermore, our 4D AB-EM algorithm incorporated and emphasized the use of spatially varying lower bounds to achieve enhanced performance. As validation, the means of parameters estimated from 55 human 11C-raclopride dynamic PET studies were used for extensive simulations using a mathematical brain phantom. Images were reconstructed using conventional indirect as well as proposed direct parametric imaging methods. Noise versus bias quantitative measurements were performed in various regions of the brain. Direct 4D EM reconstruction resulted in notable qualitative and quantitative accuracy

  3. Modeling of economic systems with Petri nets

    Directory of Open Access Journals (Sweden)

    Pavel Valeryevich Skorodumov

    2014-09-01

    Full Text Available Modeling is one of the most important tools to study complex systems. Components of both continuous and discrete nature are present in the behavior of contemporary economic systems. The article uses formalism of nested hybrid Petri nets as a tool to study complex economic systems. The author describes basic approaches of simulation modelling, concepts of classical Petri nets, modified means of nested hybrid Petri nets, benefits of their use for systems modeling. The article presents the concept of a universal system of simulation modeling. On the basis of considered approaches the article proposes to develop a universal system of simulation modeling on the basis of the modified machine Petri nets

  4. Pesquisa de anticorpos antinucleossoma em lúpus eritematoso sistêmico Detection of antinucleosome antibodies in systemic lupus erythematosus

    Directory of Open Access Journals (Sweden)

    Isabella Lima

    2007-06-01

    Full Text Available OBJETIVOS: determinar a freqüência dos anticorpos antinucleossoma (AN em lúpus eritematoso sistêmico (LES e avaliar a associação desses anticorpos com a atividade de doença. MÉTODOS: estudo de corte transversal em que foram estudados pacientes com diagnóstico de LES baseado nos critérios do Colégio Americano de Reumatologia. Utilizou-se o SLEDAI como instrumento de avaliação de atividade de doença. A pesquisa de anticorpos AN foi realizada pela técnica de ELISA (INOVA Diagnostics Inc. Pacientes com diagnóstico de miosite e esclerose sistêmica (ES foram também estudados para avaliação da performance do teste. RESULTADOS: foram estudados 82 pacientes com LES, sendo 81 do sexo feminino, com idade média de 35 ± 11,7 anos. Anticorpos AN foram detectados em 48 pacientes com LES (58,5%, em três pacientes com miosite (21,4% e em dois pacientes com ES (14,2%, o que determinou sensibilidade e especificidade de 58,5% e 82,14%, respectivamente. Considerando-se um ponto de corte em 40 U, os anticorpos AN foram detectados em 44 pacientes com LES (53,65%, em dois pacientes com miosite (13,33% e em um paciente com ES (6,66%, o que determinou sensibilidade e especificidade de 53,65% e 90%, respectivamente. Não se observou correlação dos títulos dos anticorpos AN e a atividade de doença (SLEDAI, embora tenha sido observada correlação entre anti-DNA e escore de SLEDAI nessa mesma população (r = 0,42; p OBJECTIVE: to determine the frequency of antinucleosome (AN antibodies in systemic lupus erythematosus (SLE and their association with disease activity. METHODS: cross-sectional study to evaluate patients with diagnosis of SLE based on the American College of Rheumatology criteria. SLEDAI score was used as a disease activity index. AN antibodies were tested by ELISA (INOVA Diagnostics Inc. Systemic sclerosis (SSc and myositis patients were also studied to determine the diagnostic performance of the ELISA system. RESULTS: a total of 82

  5. Modeling Power Systems as Complex Adaptive Systems

    Energy Technology Data Exchange (ETDEWEB)

    Chassin, David P.; Malard, Joel M.; Posse, Christian; Gangopadhyaya, Asim; Lu, Ning; Katipamula, Srinivas; Mallow, J V.

    2004-12-30

    Physical analogs have shown considerable promise for understanding the behavior of complex adaptive systems, including macroeconomics, biological systems, social networks, and electric power markets. Many of today's most challenging technical and policy questions can be reduced to a distributed economic control problem. Indeed, economically based control of large-scale systems is founded on the conjecture that the price-based regulation (e.g., auctions, markets) results in an optimal allocation of resources and emergent optimal system control. This report explores the state-of-the-art physical analogs for understanding the behavior of some econophysical systems and deriving stable and robust control strategies for using them. We review and discuss applications of some analytic methods based on a thermodynamic metaphor, according to which the interplay between system entropy and conservation laws gives rise to intuitive and governing global properties of complex systems that cannot be otherwise understood. We apply these methods to the question of how power markets can be expected to behave under a variety of conditions.

  6. Neuman systems model in holland: an update.

    Science.gov (United States)

    Merks, André; Verberk, Frans; de Kuiper, Marlou; Lowry, Lois W

    2012-10-01

    The authors of this column, leading members of the International Neuman Systems Model Association, provide an update on the use of Neuman systems model in Holland and document the various changes in The Netherlands that have influenced the use of the model in that country. The model's link to systems theory and stress theory are discussed, as well as a shift to greater emphasis on patient self-management. The model is also linked to healthcare quality improvement and interprofessional collaboration in Holland.

  7. Caos determinístico em um modelo simplificado de cadeia produtiva Deterministic chaos in simplified supply chain model

    Directory of Open Access Journals (Sweden)

    Júlio César Bastos de Figueiredo

    2013-06-01

    Full Text Available Este trabalho tem por objetivo apresentar um modelo teórico simplificado de cadeia produtiva onde as relações entre o número de competidores, os tempos de resposta para ajustes da produção e a intensidade da resposta das empresas levam intrinsecamente ao surgimento de oscilações caóticas na oferta e na demanda. No modelo proposto, desenvolvido com o uso da metodologia de dinâmica de sistemas, as flutuações irregulares na demanda e nos preços estão intimamente relacionadas com a própria estrutura da cadeia, ou seja, com suas regras, políticas e capacidades produtivas. São feitas considerações sobre a importância do estudo de caos aplicado à economia e são discutidas técnicas para caracterização de comportamento caótico em séries econômicas.The purpose of this study was to present a simplified supply chain model where the relations between the number of competitors, the delay in production adjustments, and the intensity response of each company lead, intrinsically, to the emergence of chaotic oscillations in supply and demand. In the considered model, developed with the use of the System Dynamics methodology, the irregular fluctuations in demand and prices are closely related to the supply chain structure, that is, its rules, policies and capabilities. Discussions about the importance of the study of chaos applied to the economy are developed and specific techniques for characterization of chaotic behavior in economic time series are presented.

  8. New model systems for experimental evolution.

    Science.gov (United States)

    Collins, Sinéad

    2013-07-01

    Microbial experimental evolution uses a few well-characterized model systems to answer fundamental questions about how evolution works. This special section highlights novel model systems for experimental evolution, with a focus on marine model systems that can be used to understand evolutionary responses to global change in the oceans.

  9. Performance modeling of automated manufacturing systems

    Science.gov (United States)

    Viswanadham, N.; Narahari, Y.

    A unified and systematic treatment is presented of modeling methodologies and analysis techniques for performance evaluation of automated manufacturing systems. The book is the first treatment of the mathematical modeling of manufacturing systems. Automated manufacturing systems are surveyed and three principal analytical modeling paradigms are discussed: Markov chains, queues and queueing networks, and Petri nets.

  10. Modeling human operator involvement in robotic systems

    NARCIS (Netherlands)

    Wewerinke, P.H.

    1991-01-01

    A modeling approach is presented to describe complex manned robotic systems. The robotic system is modeled as a (highly) nonlinear, possibly time-varying dynamic system including any time delays in terms of optimal estimation, control and decision theory. The role of the human operator(s) is modeled

  11. Visual computing model for immune system and medical system.

    Science.gov (United States)

    Gong, Tao; Cao, Xinxue; Xiong, Qin

    2015-01-01

    Natural immune system is an intelligent self-organizing and adaptive system, which has a variety of immune cells with different types of immune mechanisms. The mutual cooperation between the immune cells shows the intelligence of this immune system, and modeling this immune system has an important significance in medical science and engineering. In order to build a comprehensible model of this immune system for better understanding with the visualization method than the traditional mathematic model, a visual computing model of this immune system was proposed and also used to design a medical system with the immune system, in this paper. Some visual simulations of the immune system were made to test the visual effect. The experimental results of the simulations show that the visual modeling approach can provide a more effective way for analyzing this immune system than only the traditional mathematic equations.

  12. Externalizing Behaviour for Analysing System Models

    NARCIS (Netherlands)

    Ivanova, Marieta Georgieva; Probst, Christian W.; Hansen, René Rydhof; Kammüller, Florian

    Systems models have recently been introduced to model organisationsandevaluate their vulnerability to threats and especially insiderthreats. Especially for the latter these models are very suitable, since insiders can be assumed to have more knowledge about the attacked organisation than outside

  13. CONTROL SYSTEM IDENTIFICATION THROUGH MODEL MODULATION METHODS

    Science.gov (United States)

    identification has been achieved by using model modulation techniques to drive dynamic models into correspondence with operating control systems. The system ... identification then proceeded from examination of the model and the adaptive loop. The model modulation techniques applied to adaptive control

  14. Two sustainable energy system analysis models

    DEFF Research Database (Denmark)

    Lund, Henrik; Goran Krajacic, Neven Duic; da Graca Carvalho, Maria

    2005-01-01

    This paper presents a comparative study of two energy system analysis models both designed with the purpose of analysing electricity systems with a substantial share of fluctuating renewable energy.......This paper presents a comparative study of two energy system analysis models both designed with the purpose of analysing electricity systems with a substantial share of fluctuating renewable energy....

  15. Sistema de informações para acompanhamento, controle e auditoria em saúde pública Information system for tracking, control and audit in public health

    Directory of Open Access Journals (Sweden)

    Giovanna S. F. Cerchiari

    2008-10-01

    Full Text Available Este artigo apresenta alternativas para a gestão dos recursos destinados à saúde pública, por meio de um sistema de informações para os programas de diabetes e hipertensão e resulta do interesse em analisar a efetividade dos programas destinados aos portadores de doenças crônico-degenerativas. As questões analisadas foram focadas em fatores que traduzem a efetividade das ações desenvolvidas, isto é, a capacidade de gerar resultados a partir dos investimentos feitos. Isso ocorreu por meio de um modelo proposto para análise do resultado, mediante o estabelecimento de um indicador que consolidou três frentes de resultado, o número de óbitos, internações e atendimentos ambulatoriais. O índice estabelecido para análise da efetividade derivou em um indicador de custos. Como percurso metodológico foi aplicado o modelo teórico de planejamento e controle de produção (PCP elaborado por Erdmann (1998, que considera sete etapas para a consolidação de informações fragmentadas em um sistema.This article presents alternatives to the management of resources destined for public health through an information system for diabetes and hypertension programs. It intends to analyze the effectiveness of the programs focused on chronic and degenerative disease porters. The questions analyzed were centered on factors that translated the developed actions effectiveness, that is, the capacity to get results through investments you have made. We used a model to investigate the results, intervening in the establishment of an indicator that consolidated three fronts of results, the number of deaths, hospitalizations and ambulatory appointments. The established index for effectiveness analysis resulted in a cost indicator. As a methodology we used a theoretical model of Production Control and Plan (PCP, elaborated by Erdmann (1998, which considered seven stages for a consolidation of a fragmented information system.

  16. Isolated Richter's syndrome in central nervous system: case report Sindrome de Richter isolada em sistema nervoso central: relato de caso

    Directory of Open Access Journals (Sweden)

    Lucilene S.R. Resende

    2005-06-01

    Full Text Available Diffuse large cell non Hodgkin's lymphoma associated with chronic lymphoid leukemia (CLL, or Richter's syndrome, is a rare and serious complication. Isolated Richter's syndrome in the central nervous system is very rare; only 12 cases have been reported. We describe a 74-year-old patient with diffuse large cell non Hodgkin's lymphoma in the right frontal region with the appearance of multiform glioblastoma.Linfoma não Hodgkin difuso de grandes células em paciente portador de leucemia linfóide crônica (LLC, ou síndrome de Richter, é complicação rara e grave nesta leucemia. Síndrome de Richter isolada no sistema nervoso central é muito rara, tendo sido encontrados apenas 12 casos descritos. Descrevemos paciente de 74 anos, que apresentou linfoma não Hodgkin difuso de grandes células em região frontal direita, simulando glioblastoma multiforme.

  17. Surto de listeriose sistêmica em chinchilas Outbreak of systemic listeriosis in chinchillas

    Directory of Open Access Journals (Sweden)

    Jackeline Karsten Kirinus

    2010-03-01

    Full Text Available A listeriose é uma doença infecciosa que afeta uma grande variedade de espécies animais, causando septicemia, encefalite e aborto. As chinchilas são os animais mais susceptíveis à infecção sistêmica por Listeria monocytogenes. Este relato descreve um surto de listeriose sistêmica em uma criação de chinchilas da região central do Estado do Rio Grande do Sul, onde cerca de 16% das chinchilas morreram. Na necropsia, havia múltiplos focos brancos, pequenos e de distribuição aleatória nas superfícies capsular e de corte do fígado e aumento de volume do linfonodo hepático. Histologicamente, observaram-se hepatite necrossupurativa e linfadenite supurativa multifocais, com numerosos bacilos intralesionais. L. monocytogenes foi o agente etiológico do surto de listeriose sistêmica, sendo o diagnóstico confirmado por meio das lesões de necropsia e histopatológicas, das características fenotípicas e genotípicas da bactéria e da técnica de imuno-histoquímica.Listeriosis is an infectious disease, which affects a variety of animal species and cause septicemia, encephalitis and abortion. Chinchillas are the most susceptible animals to the systemic infection by Listeria monocytogenes. This report describes an outbreak of systemic listeriosis in a farm of chinchillas in the Central region of the Rio Grande do Sul state, Brazil. Mortality rate was about 16%. On necropsy, there were multiple random small white foci on the liver capsule and parenchyma and enlargement of the hepatic lymph node. Histologically, there were multifocal necro-suppurative hepatitis and suppurative lymphadenitis with numerous intralesional bacilli. L. monocytogenes was the etiology of the systemic listeriosis outbreak. The diagnosis was based on gross and microscopic lesions, genotypical and phenotypical characteristics and by immunohistochemistry technique.

  18. Um modelo para orientação familial em oligofrenias A model for familial orientation on mental retardation

    Directory of Open Access Journals (Sweden)

    Aguinaldo Gonçalves

    1976-03-01

    Full Text Available Após revisão de teorias e evidências sobre a etiologia das oligofrenias, são apresentados casos clínicos de oligofrênicos atendidos em serviço de Genética Médica, os quais servem de substrato para a proposição de um modelo de Aconselhamento Genético, que os classifica em ambiental, gênica, cromossômica, familial e idiopática.Theories and evidences on etiology of mental retardation are presented. Five cases of mental retardation from a Clinical Genetics Service are reported, as basis for an etiological model on mental retardation, quite operational in genetic counseling and familial orientation.

  19. Lab-scale periphyton-based system for fish culture Sistema laboratorial baseado em perifíton para piscicultura

    Directory of Open Access Journals (Sweden)

    Davi de Holanda Cavalcante

    2011-12-01

    Full Text Available The present research aimed to assess a lab-scale model to study periphyton-based systems for fish culture. Twenty-five liters plastic aquaria were stocked with three Nile tilapia, Oreochromis niloticus, juveniles (0.77±0.09g; 12 fish m-2 for 6 weeks in a 2x2 factorial design. Small plastic bottles were placed in some aquaria for periphyton development. Two feeding regimes were employed: "full-fed" (standard feeding rates were fully adopted and "half-fed" (50% of standard feeding rates. Growth performance and limnological variables were observed in each aquarium. There werefive replicates per treatment. Fish have fed actively on periphyton, especially in the half-fed aquaria. The placement of periphyton bottles had no significant effects on the water quality variables, except by the gross primary productivity which became lower. Half-fed aquaria presented lower concentrations of ammonia (0.28-0.29mg L-1, nitrite (0.33-0.37mg L-1 and phosphorus (0.42-0.43mg L-1 than full-fed aquaria (0.57-0.60mg L-1; 0.75-0.77mg L-1; 0.67-0.70mg L-1, respectively. The final body weight of fish in half-fed aquaria with periphyton bottles (6.22±0.64g was significantly higher than in aquaria without bottles (4.65±0.36g. Although the growth rate of fish was lower in the half-fed aquaria (4.27-4.72 vs. 5.29-5.61% BW day-1, survival was significantly higher when compared to the full-fed aquaria (93.3-100.0 vs. 80.0-83.4%. Only in the aquaria with periphyton the feed conversation ratio was improved by the feeding restriction regime.O presente trabalho teve como objetivo avaliar um modelo laboratorial para estudo de sistemas de cultivo de peixes baseados em perifíton. Aquários de 25L foram estocados com três juvenis de tilápia do Nilo, Oreochromis niloticus (0,77±0,09g; 12 peixes m-2 por seis semanas, em arranjo fatorial 2x2. Pequenas garrafas plásticas foram colocadas em determinados aquários para o desenvolvimento de perifíton. Dois regimes alimentares foram

  20. Graphical Model Debugger Framework for Embedded Systems

    DEFF Research Database (Denmark)

    Zeng, Kebin; Guo, Yu; Angelov, Christo K.

    2010-01-01

    Model Driven Software Development has offered a faster way to design and implement embedded real-time software by moving the design to a model level, and by transforming models to code. However, the testing of embedded systems has remained at the code level. This paper presents a Graphical Model...... Debugger Framework, providing an auxiliary avenue of analysis of system models at runtime by executing generated code and updating models synchronously, which allows embedded developers to focus on the model level. With the model debugger, embedded developers can graphically test their design model...

  1. A predictive model of the effect of environmental factors on the occurrence of otters (<em>Lutra lutraem> L. in Hungary

    Directory of Open Access Journals (Sweden)

    Ildikó Kemenes

    1995-12-01

    Full Text Available Abstract A survey of the distribution of otters (<em>Lutra lutraem> L. in Hungary revealed that this species is common in most parts of the country where there appear to be suitable aquatic habitats. However, there were a large number of apparently "good" habitats where no otters were found. On the other hand, in some places where, based on a qualitative assessment, otters should not have been present, we still found signs of them. The only strictly and consistently limiting factor was heavy chemical pollution of the water which could not be assayed during the survey but was analysed based on data provided by the water authorities. These observations led us to employ a quantitative method which takes into account 3 scalable and 5 non-scalable variables of the environment and their relationships which might influence the occurrence of otters. The technique was based on a non-parametric multiple regression method specifically developed for use on PCs. This so called logistic regression model is useful for investigating the relationships between a binary dependent variable and a set of categorical independent variables. We recorded the presence (1 or absence (0 of signs of otters as well as the water depth, steepness of the bank, density of the bank vegetation and the presence or absence of various disturbance factors, such as agricultural use of the water bank, obvious signs of pollution of the water, etc., at 369 sites in Hungary. The three former environmental variables were scaled, whereas the disturbance factors were each assigned a value of either 0 or 1 (0 = absent, 1 = present. The analysis has shown that this method can be used to characterise particular combinations of factors at which otters were most likely to occur and even predictions can be made on the probability of finding otters at particular places with a known combination of these environmental factors. Besides its theoretical importance, this method is a very

  2. Particle Tracking Model (PTM) with Coastal Modeling System (CMS)

    Science.gov (United States)

    2014-10-31

    System ( CMS ) 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER...www.erdc.usace.army.mil/Missions/WaterResources/CIRP.aspx Coastal Inlets Research Program Particle Tracking Model (PTM) with Coastal Modeling System ( CMS ) The...System ( CMS ), which provides coupled wave and current forcing for PTM simulations. CMS -PTM is implemented in the Surface-water Modeling System, a

  3. Analysis hierarchical model for discrete event systems

    Science.gov (United States)

    Ciortea, E. M.

    2015-11-01

    The This paper presents the hierarchical model based on discrete event network for robotic systems. Based on the hierarchical approach, Petri network is analysed as a network of the highest conceptual level and the lowest level of local control. For modelling and control of complex robotic systems using extended Petri nets. Such a system is structured, controlled and analysed in this paper by using Visual Object Net ++ package that is relatively simple and easy to use, and the results are shown as representations easy to interpret. The hierarchical structure of the robotic system is implemented on computers analysed using specialized programs. Implementation of hierarchical model discrete event systems, as a real-time operating system on a computer network connected via a serial bus is possible, where each computer is dedicated to local and Petri model of a subsystem global robotic system. Since Petri models are simplified to apply general computers, analysis, modelling, complex manufacturing systems control can be achieved using Petri nets. Discrete event systems is a pragmatic tool for modelling industrial systems. For system modelling using Petri nets because we have our system where discrete event. To highlight the auxiliary time Petri model using transport stream divided into hierarchical levels and sections are analysed successively. Proposed robotic system simulation using timed Petri, offers the opportunity to view the robotic time. Application of goods or robotic and transmission times obtained by measuring spot is obtained graphics showing the average time for transport activity, using the parameters sets of finished products. individually.

  4. Hamiltonian reduction of the U$_{EM}$(1) gauged three flavour WZW model

    CERN Document Server

    Paschalis, J E

    1995-01-01

    The three-flavour Wess-Zumino model coupled to electromagnetism is treated as a constraint system using the Faddeev-Jackiw method. Expanding into series of powers of the Goldstone boson fields and keeping terms up to second and third order we obtain Coulomb-gauge hamiltonian densities.

  5. Extensions in model-based system analysis

    OpenAIRE

    Graham, Matthew R.

    2007-01-01

    Model-based system analysis techniques provide a means for determining desired system performance prior to actual implementation. In addition to specifying desired performance, model-based analysis techniques require mathematical descriptions that characterize relevant behavior of the system. The developments of this dissertation give ex. tended formulations for control- relevant model estimation as well as model-based analysis conditions for performance requirements specified as frequency do...

  6. Inductive modelling of an entrepreneurial system

    OpenAIRE

    Yearworth, M

    2010-01-01

    We describe the development of a novel approach to generating theory about the behaviour of an entrepreneurial or start-up system. The new technology business creation system in and around the cities of Bath and Bristol in the UK was analysed using an inductive modelling approach that hybridises grounded theory with system dynamics, a technique we have called grounded systems modelling. Three models that represent the stages of development of an idea through to successful exploitation have be...

  7. Control model for reconfigurable assembly systems

    Institute of Scientific and Technical Information of China (English)

    Yu Jianfeng; Yin Yuehong; Chen Zhaoneng

    2005-01-01

    This paper proposes knowledge based object-oriented timed colored Petri net, a modeling method for reconfigurable assembly systems. Combining knowledge and object-oriented method into timed colored Petri net, a comprehensive and powerful representation model for control of RAS is obtained. With object-oriented method the whole system can be decomposed into concrete objects explicitly, and their relationships are constructed according to the system assembly requirements. Finally, a simple assembly system modeled by the KTCOPN is presented.

  8. <em>Ipomoea aquaticaem> Extract Shows Protective Action Against Thioacetamide-Induced Hepatotoxicity

    OpenAIRE

    Hadi, A. Hamid A.; Siddig Ibrahim Abdelwahab; Suzy Munir Salama; Salim Said Alkiyumi; Mahmood Ameen Abdullah; Ahmed Salim Alrashdi

    2012-01-01

    In the Indian system of traditional medicine (Ayurveda) it is recommended to consume <em>Ipomoea em>aquatica> to mitigate disorders like jaundice. In this study, the protective effects of ethanol extract of <em>I. aquaticaem> against liver damage were evaluated in thioacetamide (TAA)-induced chronic hepatotoxicity in rats. There was no sign of toxicity in the acute toxicity study, in which Sprague-Dawley (SD) rats were orally fed with <em>...

  9. Modelling Immune System: Principles, Models,Analysis and Perspectives

    Institute of Scientific and Technical Information of China (English)

    Xiang-hua Li; Zheng-xuan Wang; Tian-yang Lu; Xiang-jiu Che

    2009-01-01

    The biological immune system is a complex adaptive system. There are lots of benefits for building the model of the immune system. For biological researchers, they can test some hypotheses about the infection process or simulate the responses of some drugs. For computer researchers, they can build distributed, robust and fault tolerant networks inspired by the functions of the immune system. This paper provides a comprehensive survey of the literatures on modelling the immune system. From the methodology perspective, the paper compares and analyzes the existing approaches and models, and also demonstrates the focusing research effort on the future immune models in the next few years.

  10. Experimental model of gastroesophageal reflux in rats Modelo experimental de refluxo gastroesofágico em ratos

    Directory of Open Access Journals (Sweden)

    Edmilson Vieira Gaia Filho

    2005-12-01

    Full Text Available PURPOSE: To develop an experimental model of gastroesophageal reflux in rats. METHODS: Sixty Wistar rats underwent surgery and were assigned to one of the three groups of twenty animals each. The animals in group A underwent total esophageal myectomy and, in group (B, underwent partial myectomy. The third group was the control group (C. A contrast radiographic study of the esophagus was performed to evaluate gastroesophageal reflux. The anatomopathological study of the esophagus was used to evaluate esophagitis. RESULTS: During the 30-day postoperative follow-up, 14 animals in group A presented with reflux of barium in the esophagus. The presence of barium in the esophagus was observed in 7 animals in group B and in 2 animals in the control group. The result of the histopathology examination was controversial. A marked weight loss in the rats undergoing total myectomy was observed, however there was no significant statistical difference. CONCLUSION: Total myectomy in the lower third of the esophagus caused gastroesophageal reflux in the majority of the animals.OBJETIVO: Desenvolver um modelo experimental de refluxo gastroesofágico em ratos. MÉTODOS: Sessenta ratos, Wistar, foram operados e distribuídos em três grupos de vinte animais. Os animais foram submetidos a miectomia total do esôfago em um grupo(A, e em outro grupo foram submetidos a miectomia parcial(B. O terceiro grupo foi o grupo controle(C. Para avaliar o refluxo gastroesofágico realizou-se o estudo radiológico contrastado do esôfago. O estudo anátomo-patológico do esôfago foi utilizado para avaliar esofagite. RESULTADOS: Durante os 30 dias de pós-operatório, 14 animais do grupo A apresentaram refluxo de Bário no esôfago. Em 07 animais do grupo B e em 02 do grupo controle, foram observados a presença de Bário no esôfago. O resultado do histopatológico foi controverso. Observou-se perda ponderal importante nos ratos submetidos a miectomia total, porém não existiu

  11. Comparison of Photovoltaic Models in the System Advisor Model: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Blair, N. J.; Dobos, A. P.; Gilman, P.

    2013-08-01

    The System Advisor Model (SAM) is free software developed by the National Renewable Energy Laboratory (NREL) for predicting the performance of renewable energy systems and analyzing the financial feasibility of residential, commercial, and utility-scale grid-connected projects. SAM offers several options for predicting the performance of photovoltaic (PV) systems. The model requires that the analyst choose from three PV system models, and depending on that choice, possibly choose from three module and two inverter component models. To obtain meaningful results from SAM, the analyst must be aware of the differences between the model options and their applicability to different modeling scenarios. This paper presents an overview the different PV model options and presents a comparison of results for a 200-kW system using different model options.

  12. Graphical Model Debugger Framework for Embedded Systems

    DEFF Research Database (Denmark)

    Zeng, Kebin

    2010-01-01

    Debugger Framework, providing an auxiliary avenue of analysis of system models at runtime by executing generated code and updating models synchronously, which allows embedded developers to focus on the model level. With the model debugger, embedded developers can graphically test their design model......Model Driven Software Development has offered a faster way to design and implement embedded real-time software by moving the design to a model level, and by transforming models to code. However, the testing of embedded systems has remained at the code level. This paper presents a Graphical Model...... and check the running status of the system, which offers a debugging capability on a higher level of abstraction. The framework intends to contribute a tool to the Eclipse society, especially suitable for model-driven development of embedded systems....

  13. Implementing EM and Viterbi algorithms for Hidden Markov Model in linear memory

    Directory of Open Access Journals (Sweden)

    Winters-Hilt Stephen

    2008-04-01

    Full Text Available Abstract Background The Baum-Welch learning procedure for Hidden Markov Models (HMMs provides a powerful tool for tailoring HMM topologies to data for use in knowledge discovery and clustering. A linear memory procedure recently proposed by Miklós, I. and Meyer, I.M. describes a memory sparse version of the Baum-Welch algorithm with modifications to the original probabilistic table topologies to make memory use independent of sequence length (and linearly dependent on state number. The original description of the technique has some errors that we amend. We then compare the corrected implementation on a variety of data sets with conventional and checkpointing implementations. Results We provide a correct recurrence relation for the emission parameter estimate and extend it to parameter estimates of the Normal distribution. To accelerate estimation of the prior state probabilities, and decrease memory use, we reverse the originally proposed forward sweep. We describe different scaling strategies necessary in all real implementations of the algorithm to prevent underflow. In this paper we also describe our approach to a linear memory implementation of the Viterbi decoding algorithm (with linearity in the sequence length, while memory use is approximately independent of state number. We demonstrate the use of the linear memory implementation on an extended Duration Hidden Markov Model (DHMM and on an HMM with a spike detection topology. Comparing the various implementations of the Baum-Welch procedure we find that the checkpointing algorithm produces the best overall tradeoff between memory use and speed. In cases where sequence length is very large (for Baum-Welch, or state number is very large (for Viterbi, the linear memory methods outlined may offer some utility. Conclusion Our performance-optimized Java implementations of Baum-Welch algorithm are available at http://logos.cs.uno.edu/~achurban. The described method and implementations will aid

  14. Modeling and Identification of Multirate Systems

    Institute of Scientific and Technical Information of China (English)

    Feng DING; Tongwen CHEN

    2005-01-01

    Multirate systems are abundant in industry; for example, many soft-sensor design problems are related to modeling, parameter identification, or state estimation involving multirate systems. The study of multirate systems goes back to the early 1950's, and has become an active research area in systems and control. This paper briefly surveys the history of development in the area of multirate systems, and introduces some basic concepts and latest results on multirate systems, including a polynomial transformation technique and the lifting technique as tools for handling multirate systems, lifted state space models, parameter identification of dual-rate systems, how to determine fast single-rate models from dual-rate models and directly from dual-rate data, and a hierarchical identification method for general multirate systems. Finally, some further research topics for multirate systems are given.

  15. On Problems of Multicomponent System Maintenance Modelling

    Institute of Scientific and Technical Information of China (English)

    Tomasz Nowakowski; Sylwia Werbinka

    2009-01-01

    We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization models: the block replacement models, group maintenance models, and opportunistic maintenance models. Moreover, an example of a two-unit system maintenance process is provided in order to compare various maintenance policies.

  16. Traffic Modeling in WCDMA System Level Simulations

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Traffic modeling is a crucial element in WCDMA system level simulations. A clear understanding of the nature of traffic in the WCDMA system and subsequent selection of an appropriate random traffic model are critical to the success of the modeling enterprise. The resultant performances will evidently be of a function that our design has been well adapted to the traffic, channel and user mobility models, and these models are also accurate. In this article, our attention will be focused on modeling voice and WWW data traffic with the SBBP model and Victor model respectively.

  17. Towards Modelling of Hybrid Systems

    DEFF Research Database (Denmark)

    Wisniewski, Rafal

    2006-01-01

    The article is an attempt to use methods of category theory and topology for analysis of hybrid systems. We use the notion of a directed topological space; it is a topological space together with a set of privileged paths. Dynamical systems are examples of directed topological spaces. A hybrid...... system consists of a number of dynamical systems that are glued together according to information encoded in the discrete part of the system. We develop a definition of a hybrid system as a functor from the category generated by a transition system to the category of directed topological spaces. Its...... directed homotopy colimit (geometric realization) is a single directed topological space. The behavior of hybrid systems can be then understood in terms of the behavior of dynamical systems through the directed homotopy colimit....

  18. Desenvolvimento de um modelo experimental de hemodiálise em cães Development of a dog model of hemodialysis

    Directory of Open Access Journals (Sweden)

    Andre M.C Meneses

    2010-10-01

    Full Text Available Com o objetivo de desenvolver um modelo de hemodiálise (HD em cães, foram estudados 18 animais, sem raça definida, machos, clinicamente sadios, com peso corporal variando entre sete e 14 kg. O acesso vascular foi obtido através de implantação do cateter de duplo lúmen em veia jugular externa. As sessões de HD, em número de cinco por animal, com até três horas de duração, foram realizadas em hemodialisadora de sistema proporcional com ultrafiltração (UF controlada, com solução dialisante padrão e tampão bicarbonato. A UF foi ajustada para HD isovolêmica, utilizou-se perfil de sódio, e para anticoagulação heparina sódica. Os animais foram mantidos anestesiados com cloridrato de levomepromazina e propofol. Foram avaliados dados hematológicos, bioquímicos, hemogasometria, pressão arterial sistêmica e tempo de coagulação ativado. Foi observada diminuição do número global de hemácias, volume globular, hemoglobina e leucócitos. Em relação aos exames bioquímicos, houve manutenção nos níveis de sódio sérico, e quanto à hemogasometria, a manutenção da SO2. A pressão arterial sistêmica manteve-se constante. Os resultados obtidos no presente trabalho permitiram concluir que foi possível o desenvolvimento do modelo proposto e mostrou que a HD em cães é um método viável e seguro, que poderá contribuir para o tratamento clínico da insuficiência renal nesta espécie.To develop a model of hemodialysis (HD, 18 healthy dogs, without a defined breed, males, weighing 7-14 kg, were studied. A double lumen catheter was inserted into the jugular vein for vascular access. HD sessions, totalizing 5 for each dog, were performed with a proportional HD machine, controlled isovolemic ultrafiltration, standard dialysis solution and bicarbonate buffer. Sodium profile and sodium heparin were used. During HD sessions the dogs were kept anesthetized (levomepromazine and propofol. Hematological and biochemistry data, blood

  19. Service systems concepts, modeling, and programming

    CERN Document Server

    Cardoso, Jorge; Poels, Geert

    2014-01-01

    This SpringerBrief explores the internal workings of service systems. The authors propose a lightweight semantic model for an effective representation to capture the essence of service systems. Key topics include modeling frameworks, service descriptions and linked data, creating service instances, tool support, and applications in enterprises.Previous books on service system modeling and various streams of scientific developments used an external perspective to describe how systems can be integrated. This brief introduces the concept of white-box service system modeling as an approach to mo

  20. Hydrological modelling in forested systems

    Science.gov (United States)

    This chapter provides a brief overview of forest hydrology modelling approaches for answering important global research and management questions. Many hundreds of hydrological models have been applied globally across multiple decades to represent and predict forest hydrological p...

  1. Modeling, Control and Coordination of Helicopter Systems

    CERN Document Server

    Ren, Beibei; Chen, Chang; Fua, Cheng-Heng; Lee, Tong Heng

    2012-01-01

    Modeling, Control and Coordination of Helicopter Systems provides a comprehensive treatment of helicopter systems, ranging from related nonlinear flight dynamic modeling and stability analysis to advanced control design for single helicopter systems, and also covers issues related to the coordination and formation control of multiple helicopter systems to achieve high performance tasks. Ensuring stability in helicopter flight is a challenging problem for nonlinear control design and development. This book is a valuable reference on modeling, control and coordination of helicopter systems,providing readers with practical solutions for the problems that still plague helicopter system design and implementation. Readers will gain a complete picture of helicopters at the systems level, as well as a better understanding of the technical intricacies involved. This book also: Presents a complete picture of modeling, control and coordination for helicopter systems Provides a modeling platform for a general class of ro...

  2. Electronic Education System Model-2

    Science.gov (United States)

    Güllü, Fatih; Kuusik, Rein; Laanpere, Mart

    2015-01-01

    In this study we presented new EES Model-2 extended from EES model for more productive implementation in e-learning process design and modelling in higher education. The most updates were related to uppermost instructional layer. We updated learning processes object of the layer for adaptation of educational process for young and old people,…

  3. Network and adaptive system of systems modeling and analysis.

    Energy Technology Data Exchange (ETDEWEB)

    Lawton, Craig R.; Campbell, James E. Dr. (.; .); Anderson, Dennis James; Eddy, John P.

    2007-05-01

    This report documents the results of an LDRD program entitled ''Network and Adaptive System of Systems Modeling and Analysis'' that was conducted during FY 2005 and FY 2006. The purpose of this study was to determine and implement ways to incorporate network communications modeling into existing System of Systems (SoS) modeling capabilities. Current SoS modeling, particularly for the Future Combat Systems (FCS) program, is conducted under the assumption that communication between the various systems is always possible and occurs instantaneously. A more realistic representation of these communications allows for better, more accurate simulation results. The current approach to meeting this objective has been to use existing capabilities to model network hardware reliability and adding capabilities to use that information to model the impact on the sustainment supply chain and operational availability.

  4. On Verification Modelling of Embedded Systems

    NARCIS (Netherlands)

    Brinksma, Ed; Mader, Angelika

    2004-01-01

    Computer-aided verification of embedded systems hinges on the availability of good verification models of the systems at hand. Such models must be much simpler than full design models or specifications to be of practical value, because of the unavoidable combinatorial complexities in the verificatio

  5. Applying Modeling Tools to Ground System Procedures

    Science.gov (United States)

    Di Pasquale, Peter

    2012-01-01

    As part of a long-term effort to revitalize the Ground Systems (GS) Engineering Section practices, Systems Modeling Language (SysML) and Business Process Model and Notation (BPMN) have been used to model existing GS products and the procedures GS engineers use to produce them.

  6. Protótipo de sistema de documentação em enfermagem no puerpério Documentation system prototype for postpartum nursing

    Directory of Open Access Journals (Sweden)

    Regina Célia Sales Santos Veríssimo

    2013-01-01

    Full Text Available OBJETIVO: Desenvolver protótipo de sistema de documentação em enfermagem no puerpério. MÉTODOS: Planejamento de software utilizou modelo baseado em orientação a objetos, que englobou: compreensão e definição do contexto e dos modos de utilização projeto de arquitetura do sistema, identificação dos principais objetos do sistema, desenvolvimento dos modelos do projeto, especificação das interfaces dos objetos. Foram utilizadas as linguagem Structured Query Language (SQL, MySQL e Hypertext Preprocessor (php. RESULTADOS: O protótipo apresenta os requisitos planejados, entre eles: uso da Classificação Internacional para a Prática de Enfermagem (CIPE® versão 1.0 como código de apoio para execução do processo de enfermagem; apresentação dos eixos da CIPE® versão 1.0 em ordem de uso; geração de relatórios sobre a prática de uso dos processos de enfermagem. CONCLUSÃO: O protótipo de sistema de documentação proposto foi desenvolvido com sucesso com possibilidade de registros de enfermagem por meio de linguagem padronizada.OBJECTIVE: To develop a documentation system prototype for postpartum nursing. METHODS: For the software planning, a model based on object orientation was used, which included: understanding and definition of the context and usage modes of the system design project, identification of the main objects of the system, development of project models, specification of object interfaces. The languages Structured Query Language (SQL, MySQL and Hypertext Preprocessor (php were used. RESULTS: The prototype shows the planned requirements, among them: use of the International Classification For Nursing Practice (ICNP® version 1.0 as support code to perform the nursing process; presentation of the axes of ICNP® version 1.0 in order of use; elaboration of reports about the usage practice of nursing processes. CONCLUSION: The proposed documentation system prototype was successfully developed, allowing professional

  7. System Level Modelling and Performance Estimation of Embedded Systems

    DEFF Research Database (Denmark)

    Tranberg-Hansen, Anders Sejer

    is simulation based and allows performance estimation to be carried out throughout all design phases ranging from early functional to cycle accurate and bit true descriptions of the system, modelling both hardware and software components in a unied way. Design space exploration and performance estimation...... an efficient system level design methodology, a modelling framework for performance estimation and design space exploration at the system level is required. This thesis presents a novel component based modelling framework for system level modelling and performance estimation of embedded systems. The framework...... is performed by having the framework produce detailed quantitative information about the system model under investigation. The project is part of the national Danish research project, Danish Network of Embedded Systems (DaNES), which is funded by the Danish National Advanced Technology Foundation. The project...

  8. Modeling wave trains in coastal regions; Modelagem de trens de ondas em regioes costeiras

    Energy Technology Data Exchange (ETDEWEB)

    Luz, Ana M.S.; Nachbin, A. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Matematica Pura e Aplicada (IMPA)

    2008-07-01

    Our goal is to present a model that captures how the sea bottom topography or submarine structures can influence the evolution of water wave trains over a varying topography at intermediate depth. To obtain such a model, we consider Euler equations for inviscid fluids and we perform the asymptotic simplification of the nonlinear potential theory equations together with the method of multiple scales to get a reduced model. Such a model is called reduced because it simplifies nonlinear potential theory from two spatial dimensions to one dimension along the free boundary. We consider a varying topography at the bottom and/or the presence of submarine structures together with a free boundary at the surface of the sea. For modeling such a geometry we transform our Cartesian system into curvilinear coordinates through a conformal mapping that maps the original physical domain into a simpler domain (a strip). This modeling strategy allows us to capture and understand the dynamics of water waves in regions where offshore exploration activity already exists or not. Through an efficient model we can get important information regarding the dynamics of waves in coastal regions and also questions on the viability of oil and gas recovery in these regions. (author)

  9. EXPOSURE ANALYSIS MODELING SYSTEM (EXAMS): USER MANUAL AND SYSTEM DOCUMENTATION

    Science.gov (United States)

    The Exposure Analysis Modeling System, first published in 1982 (EPA-600/3-82-023), provides interactive computer software for formulating aquatic ecosystem models and rapidly evaluating the fate, transport, and exposure concentrations of synthetic organic chemicals - pesticides, ...

  10. Simulation and optimization models for emergency medical systems planning.

    Science.gov (United States)

    Bettinelli, Andrea; Cordone, Roberto; Ficarelli, Federico; Righini, Giovanni

    2014-01-01

    The authors address strategic planning problems for emergency medical systems (EMS). In particular, the three following critical decisions are considered: i) how many ambulances to deploy in a given territory at any given point in time, to meet the forecasted demand, yielding an appropriate response time; ii) when ambulances should be used for serving nonurgent requests and when they should better be kept idle for possible incoming urgent requests; iii) how to define an optimal mix of contracts for renting ambulances from private associations to meet the forecasted demand at minimum cost. In particular, analytical models for decision support, based on queuing theory, discrete-event simulation, and integer linear programming were presented. Computational experiments have been done on real data from the city of Milan, Italy.

  11. An Operational Configuration of the ARPS Data Analysis System to Initialize WRF in the NM'S Environmental Modeling System

    Science.gov (United States)

    Case, Jonathan; Blottman, Pete; Hoeth, Brian; Oram, Timothy

    2006-01-01

    The Weather Research and Forecasting (WRF) model is the next generation community mesoscale model designed to enhance collaboration between the research and operational sectors. The NM'S as a whole has begun a transition toward WRF as the mesoscale model of choice to use as a tool in making local forecasts. Currently, both the National Weather Service in Melbourne, FL (NWS MLB) and the Spaceflight Meteorology Group (SMG) are running the Advanced Regional Prediction System (AIRPS) Data Analysis System (ADAS) every 15 minutes over the Florida peninsula to produce high-resolution diagnostics supporting their daily operations. In addition, the NWS MLB and SMG have used ADAS to provide initial conditions for short-range forecasts from the ARPS numerical weather prediction (NWP) model. Both NM'S MLB and SMG have derived great benefit from the maturity of ADAS, and would like to use ADAS for providing initial conditions to WRF. In order to assist in this WRF transition effort, the Applied Meteorology Unit (AMU) was tasked to configure and implement an operational version of WRF that uses output from ADAS for the model initial conditions. Both agencies asked the AMU to develop a framework that allows the ADAS initial conditions to be incorporated into the WRF Environmental Modeling System (EMS) software. Developed by the NM'S Science Operations Officer (S00) Science and Training Resource Center (STRC), the EMS is a complete, full physics, NWP package that incorporates dynamical cores from both the National Center for Atmospheric Research's Advanced Research WRF (ARW) and the National Centers for Environmental Prediction's Non-Hydrostatic Mesoscale Model (NMM) into a single end-to-end forecasting system. The EMS performs nearly all pre- and postprocessing and can be run automatically to obtain external grid data for WRF boundary conditions, run the model, and convert the data into a format that can be readily viewed within the Advanced Weather Interactive Processing System

  12. Recent Upgrades to NASA SPoRT Initialization Datasets for the Environmental Modeling System

    Science.gov (United States)

    Case, Jonathan L.; Lafontaine, Frank J.; Molthan, Andrew L.; Zavodsky, Bradley T.; Rozumalski, Robert A.

    2012-01-01

    The NASA Short-term Prediction Research and Transition (SPoRT) Center has developed several products for its NOAA/National Weather Service (NWS) partners that can initialize specific fields for local model runs within the NOAA/NWS Science and Training Resource Center Environmental Modeling System (EMS). The suite of SPoRT products for use in the EMS consists of a Sea Surface Temperature (SST) composite that includes a Lake Surface Temperature (LST) analysis over the Great Lakes, a Great Lakes sea-ice extent within the SST composite, a real-time Green Vegetation Fraction (GVF) composite, and NASA Land Information System (LIS) gridded output. This paper and companion poster describe each dataset and provide recent upgrades made to the SST, Great Lakes LST, GVF composites, and the real-time LIS runs.

  13. Pǎun's systems as models of economic systems

    Institute of Scientific and Technical Information of China (English)

    Waldemar Korczynski

    2007-01-01

    In the paper a concept for modeling the economic systems by the formalism of Pǎun's systems is proposed. The main idea is to represent economic systems as homomorphic images of Petri nets corresponding to the (super) cells of Pǎun's systems.

  14. The Fuzzy Modeling Algorithm for Complex Systems Based on Stochastic Neural Network

    Institute of Scientific and Technical Information of China (English)

    李波; 张世英; 李银惠

    2002-01-01

    A fuzzy modeling method for complex systems is studied. The notation of general stochastic neural network (GSNN) is presented and a new modeling method is given based on the combination of the modified Takagi and Sugeno's(MTS) fuzzy model and one-order GSNN. Using expectation-maximization (EM) algorithm, parameter estimation and model selection procedures are given. It avoids the shortcomings brought by other methods such as BP algorithm, when the number of parameters is large, BP algorithm is still difficult to apply directly without fine tuning and subjective tinkering. Finally, the simulated example demonstrates the effectiveness.

  15. Modeling Control Situations in Power System Operations

    DEFF Research Database (Denmark)

    Saleem, Arshad; Lind, Morten; Singh, Sri Niwas

    2010-01-01

    Increased interconnection and loading of the power system along with deregulation has brought new challenges for electric power system operation, control and automation. Traditional power system models used in intelligent operation and control are highly dependent on the task purpose. Thus, a model...... for intelligent operation and control must represent system features, so that information from measurements can be related to possible system states and to control actions. These general modeling requirements are well understood, but it is, in general, difficult to translate them into a model because of the lack...... of explicit principles for model construction. This paper presents a work on using explicit means-ends model based reasoning about complex control situations which results in maintaining consistent perspectives and selecting appropriate control action for goal driven agents. An example of power system...

  16. Modeling Control Situations in Power System Operations

    DEFF Research Database (Denmark)

    Saleem, Arshad; Lind, Morten; Singh, Sri Niwas

    2010-01-01

    Increased interconnection and loading of the power system along with deregulation has brought new challenges for electric power system operation, control and automation. Traditional power system models used in intelligent operation and control are highly dependent on the task purpose. Thus, a model...... for intelligent operation and control must represent system features, so that information from measurements can be related to possible system states and to control actions. These general modeling requirements are well understood, but it is, in general, difficult to translate them into a model because of the lack...... of explicit principles for model construction. This paper presents a work on using explicit means-ends model based reasoning about complex control situations which results in maintaining consistent perspectives and selecting appropriate control action for goal driven agents. An example of power system...

  17. Metastasis dosimetric evaluation applied to systemic radiotherapy; Avaliacao dosimetrica em metastases aplicada a radioterapia sistemica

    Energy Technology Data Exchange (ETDEWEB)

    Mendes, Bruno Melo; Campos, Tarcisio Passos Ribeiro [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Curso de Pos-graduacao em Ciencias e Tecnicas Nucleares

    2002-07-01

    In the cancer pathology the metastases are the major reason for death. The systemic radiotherapy proposes the prescription of systemic radiopharmaceuticals that, through their many ways of affinity with the cancerous cells, will concentrate radioisotopes on the tumor and in its metastasis, generating a possible control dose for the colony propagation. Herein, a Monte Carlo based computational model is proposed to evaluate the physical dose in an arbitrary cancerous colony of {approx}10{sup 4} small lung cancer cells, considering all possible nuclear, biological, and morphological parameters, as well as the specific compartment cellular uptakes. As result, physical absorbed dose in MeV/g was obtained in the cell's nucleus, in the cytoplasm and in the interstice, provided by x-rays, gamma rays, Auger electrons and Beta particles emitted from the following radioisotope decays: Es-89, Y-90, In-111, Sm-153, Dy-165, Ho-166, Er-169 e Re-188. It can be verified, from the reduced colony model, that the Auger electrons are responsible for a large part of the total absorbed dose, despite of the Beta energy emitted. Issuing the Auger electrons emitted by radioisotopes, as In-111 and Sm-153, reached the largest doses in the nucleus of the colony's model. The present data, conjugated with a simple biokinetics model, histological data, and medical cintilographic images allow an improvement in the evaluation of the radiopharmaceutical concentration to be prescribed for the patient. (author)

  18. Dinâmica do carbono da biomassa microbiana em cinco épocas do ano em diferentes sistemas de manejo do solo no cerrado Microbial biomass carbon dynamics in different soil management systems in the cerrado

    Directory of Open Access Journals (Sweden)

    Eloisa Aparecida Belleza Ferreira

    2007-12-01

    Full Text Available Em um Latossolo Vermelho argiloso, na Embrapa Cerrados, em Planaltina, Distrito Federal, foram selecionadas uma área com vegetação de Cerrado (CE e seis parcelas de um experimento de longa duração (20 anos: arado de discos pré-plantio (ADPP; arado de discos pós-colheita (ADPC; plantio direto a partir do segundo ano em área preparada com arado de discos em 1979, primeiro ano de cultivo (PDAD; arado de aivecas pré-plantio (AVPP; arado de aivecas pós-colheita (AVPC; e plantio direto a partir do segundo ano em área preparada com arado de aivecas em 1979, primeiro ano de cultivo (PDAV. Foram estimados o carbono da biomassa microbiana e o carbono orgânico do solo (Csolo em cinco profundidades: 0-5, 5-10, 10-20, 20-30 e 30-40 cm; e em cinco épocas do ano: na época da colheita da soja (abril/2000; no final do período chuvoso, após aração pós-colheita da soja (maio/2000; no período seco, sem nenhuma cultura no campo (agosto/2000; no início do período chuvoso, no plantio do milho (novembro/2000; e na floração da cultura do milho (fevereiro/2001. Considerando todo o período de estudo, os teores de C da biomassa microbiana (Cmic e de Csolo foram menores nas camadas mais profundas em todos os sistemas de manejo e no Cerrado. No solo sob sistema plantio direto, os teores de Cmic e Csolo decresceram das camadas mais superficiais para as mais profundas e de forma mais acentuada que no solo sob sistemas convencionais. No CE, a biomassa microbiana constituiu-se em maior percentagem do carbono orgânico total do solo, em comparação aos sistemas cultivados, que não apresentaram diferenças entre si.Microbial biomass carbon and organic carbon were measured in a long-term field experiment (20 years in Planaltina, DF, Brazil, under corn-soybean crop rotation. Six management systems were selected: disk plow before planting (ADPP; disk plow after harvesting (ADPC, no-till after disk plowing in the first year (PDAD; moldboard plow before

  19. Electromagnetic field vulnerability of complex systems – an application of EM topology

    Directory of Open Access Journals (Sweden)

    R. Kanyou Nana

    2008-05-01

    Full Text Available In complex systems like ships or airplanes many tasks vital to the function of the system are executed by electronic equipment. Earlier research Camp (2004 – Nitsch (2005 has shown that there are frequency ranges in many of these systems, in which disturbances in the system will be observed if an external electromagnetic field exceeds a certain amplitude limit. On the basis of a simplified model in which the dominating coupling mechanisms in complex systems are shown, we will present a method which allows to analyze the vulnerability to electromagnetic fields. The method is based on the segmentation of the initial problem into subproblems with respect to the coupling mechanisms. Under the assumption that the obtained classes can be handled separately, the subproblems are solved and superposed to the overall solution. The Electromagnetic Topology Baum (1982 – Lee (1982 is used to solve the subproblems. This leads to a hybrid method combining different solution approaches. The subproblems are decomposed into smaller subproblems with respect to the shielding levels. This procedure allows us to determine the coupled disturbances into the system. Finally the solution is verified with respect to prescripted limits.

  20. Modeling noisy resonant system response

    Science.gov (United States)

    Weber, Patrick Thomas; Walrath, David Edwin

    2017-02-01

    In this paper, a theory-based model replicating empirical acoustic resonant signals is presented and studied to understand sources of noise present in acoustic signals. Statistical properties of empirical signals are quantified and a noise amplitude parameter, which models frequency and amplitude-based noise, is created, defined, and presented. This theory-driven model isolates each phenomenon and allows for parameters to be independently studied. Using seven independent degrees of freedom, this model will accurately reproduce qualitative and quantitative properties measured from laboratory data. Results are presented and demonstrate success in replicating qualitative and quantitative properties of experimental data.

  1. Generic Model Host System Design

    Energy Technology Data Exchange (ETDEWEB)

    Chu, Chungming; /SLAC; Wu, Juhao; /SLAC; Qiang, Ji; /LBL, Berkeley; Shen, Guobao; /Brookhaven

    2012-06-22

    There are many simulation codes for accelerator modelling; each one has some strength but not all. A platform which can host multiple modelling tools would be ideal for various purposes. The model platform along with infrastructure support can be used not only for online applications but also for offline purposes. Collaboration is formed for the effort of providing such a platform. In order to achieve such a platform, a set of common physics data structure has to be set. Application Programming Interface (API) for physics applications should also be defined within a model data provider. A preliminary platform design and prototype is discussed.

  2. The Investigation of EM Scattering from the Time-Varying Overturning Wave Crest Model by the IEM

    Directory of Open Access Journals (Sweden)

    Xiao Meng

    2016-01-01

    Full Text Available Investigation of the electromagnetic (EM scattering of time-varying overturning wave crests is a worthwhile endeavor. Overturning wave crest is one of the reasons of sea spike generation, which increases the probability of false radar alarms and reduces the performance of multitarget detection in the environment. A three-dimensional (3D time-varying overturning wave crest model is presented in this paper; this 3D model is an improvement of the traditional two-dimensional (2D time-varying overturning wave crest model. The integral equation method (IEM was employed to investigate backward scattering radar cross sections (RCS at various incident angles of the 3D overturning wave crest model. The super phenomenon, where the intensity of horizontal polarization scattering is greater than that of vertical polarization scattering, is an important feature of sea spikes. Simulation results demonstrate that super phenomena may occur in some time samples as variations in the overturning wave crest.

  3. Soja em sucessão a adubos verdes no sistema de plantio direto e convencional em solo de Cerrado Soybean grown after green manures under no-tillage and conventional management systems in savannah soil

    Directory of Open Access Journals (Sweden)

    Marco Antonio Camillo de Carvalho

    2004-11-01

    Full Text Available A adubação verde é uma prática em que se procura preservar a qualidade do ambiente sem prescindir de produtividades elevadas das culturas e do retorno econômico. O objetivo deste trabalho foi avaliar o desempenho da cultura da soja em sucessão a adubos verdes nos sistemas de plantio direto e de preparo convencional do solo (uma gradagem pesada + duas gradagens leves. O experimento foi realizado num Latossolo Vermelho distrófico, originalmente sob vegetação de Cerrado em Selvíria, MS. Utilizaram-se quatro adubos verdes: mucuna-preta, guandu, crotalária e milheto, e área de pousio (vegetação espontânea. O cultivo de diferentes adubos verdes na primavera não influencia a produtividade da soja em sucessão, tanto em plantio direto quanto no sistema de preparo convencional do solo. Em ano com precipitação normal, o preparo convencional do solo proporciona maior produtividade da soja do que o sistema de plantio direto.The green manures aim to preserve the environment quality without discarding the largest yield of economic crops. The objective of this work was to evaluate the performance of soybean grown after green manures under no-tillage and conventional tillage (one disk harrow + two leveling harrow systems. The experiment was carried out in a Distrophic Red Latossol (typic Hapludox, covered by savannah vegetation, in Selvíria, MS, Brazil. The green manures utilized were: black velvet bean, pigeon pea, sunn hemp, millet and fallow area (spontaneous vegetation. The green manures previously grown in spring do not affect the soybean yield, in both no-tillage and conventional tillage systems. In year without dry periods, the conventional tillage provided greater grain yield.

  4. Four MATLAB-Simulink models ofphotovoltaic system

    Directory of Open Access Journals (Sweden)

    Jawad Radhi Mahmood, Nasir Hussein Selman

    2016-01-01

    Full Text Available This paper presents four different MATLAB models to simulate the output I-V and P-V characteristics of photovoltaic (PV cells or systems. All of the models are implemented with Matlab-Simulink. Detailed modeling procedure for one-diode equivalent circuit model with all equations and numerical values is presented. The parameters required for the modeling have been taken from manufacturer's datasheet for 240W SOLIMPEKS solar panel. I-V and P-V characteristics of a typical 1.92 kW PV system have been simulated using the proposed models. The simulation took into account the sunlight insolation and temperature effect. Results of the models are validated with I-V and P-V curves provided by the manufacturer(s. The proposed models are very useful for those interested in working in the field of solar systems because they emulate and analyze the characteristics of all the solar systems easily.

  5. CTL Model Update for System Modifications

    CERN Document Server

    Ding, Yulin; Zhang, Yan; Zhang, Y; 10.1613/jair.2420

    2011-01-01

    Model checking is a promising technology, which has been applied for verification of many hardware and software systems. In this paper, we introduce the concept of model update towards the development of an automatic system modification tool that extends model checking functions. We define primitive update operations on the models of Computation Tree Logic (CTL) and formalize the principle of minimal change for CTL model update. These primitive update operations, together with the underlying minimal change principle, serve as the foundation for CTL model update. Essential semantic and computational characterizations are provided for our CTL model update approach. We then describe a formal algorithm that implements this approach. We also illustrate two case studies of CTL model updates for the well-known microwave oven example and the Andrew File System 1, from which we further propose a method to optimize the update results in complex system modifications.

  6. A head-to-head hands-on comparison of ERCP mechanical simulator (EMS) and Ex-vivo Porcine Stomach Model (PSM).

    Science.gov (United States)

    Leung, Joseph W; Wang, Dong; Hu, Bing; Lim, Brian; Leung, Felix W

    2011-07-01

    BACKGROUND: ERCP mechanical simulator (EMS) and ex-vivo porcine stomach model (PSM) have been described. No direct comparison was reported on endoscopists' perception regarding their efficacy for ERCP training OBJECTIVE: Comparative assessment of EMS and PSM. DESIGN: Questionnaire survey before and after practice. SETTING: Hands-on practice workshops. SUBJECTS: 22 endoscopists with prior experience in 111±225 (mean±SD) ERCP. INTERVENTIONS: Participants performed scope insertion, selective bile duct cannulation with guide wire and insertion of a single biliary stent. Simulated fluoroscopy with external pin-hole camera (EMS), or with additional transillumination (PSM) was used to monitor exchange of accessories. MAIN OUTCOME MEASURE: Participants rated their understanding and confidence before and after hands-on practice, and credibility of each simulator for ERCP training. Comparative efficacy of EMS and PSM for ERCP education was scored (1=not, 10=very) based on pre and post practice surveys: realism (tissue pliability, papilla anatomy, visual/cannulation realism, wire manipulation, simulated fluoroscopy, overall experience); usefulness (assessment of results, supplementing clinical experience, easy for trainees to learn new skills) and application (overall ease of use, prepare trainees to use real instrument and ease of incorporation into training). RESULTS: Before hands-on practice, both EMS and PSM received high scores. After practice, there was a significantly greater increase in confidence score for EMS than PSM (pPSM credible options for improving understanding and supplementing clinical ERCP training. EMS is more useful for basic learning.

  7. Computational Models for Nonlinear Aeroelastic Systems Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Clear Science Corp. and Duke University propose to develop and demonstrate new and efficient computational methods of modeling nonlinear aeroelastic systems. The...

  8. Model Updating Nonlinear System Identification Toolbox Project

    Data.gov (United States)

    National Aeronautics and Space Administration — ZONA Technology (ZONA) proposes to develop an enhanced model updating nonlinear system identification (MUNSID) methodology that utilizes flight data with...

  9. Modeling and analysis of biomass production systems

    Energy Technology Data Exchange (ETDEWEB)

    Mishoe, J.W.; Lorber, M.N.; Peart, R.M.; Fluck, R.C.; Jones, J.W.

    1984-01-01

    BIOMET is an interactive simulation model that is used to analyze specific biomass and methane production systems. The system model is composed of crop growth models, harvesting, transportation, conversion and economic submodels. By use of menus the users can configure the structure and set selected parameters of the system to analyze the effects of variables within the component models. For example, simulations of a water hyacinth system resulted in yields of 63, 48 and 37 mg/ha/year for different harvest schedules. For napier grass, unit methane costs were $3.04, $2.86 and $2.98 for various yields of biomass. 10 references.

  10. Error Propagation in a System Model

    Science.gov (United States)

    Schloegel, Kirk (Inventor); Bhatt, Devesh (Inventor); Oglesby, David V. (Inventor); Madl, Gabor (Inventor)

    2015-01-01

    Embodiments of the present subject matter can enable the analysis of signal value errors for system models. In an example, signal value errors can be propagated through the functional blocks of a system model to analyze possible effects as the signal value errors impact incident functional blocks. This propagation of the errors can be applicable to many models of computation including avionics models, synchronous data flow, and Kahn process networks.

  11. Hydrological modeling in forested systems

    Science.gov (United States)

    H.E. Golden; G.R. Evenson; S. Tian; Devendra Amatya; Ge Sun

    2015-01-01

    Characterizing and quantifying interactions among components of the forest hydrological cycle is complex and usually requires a combination of field monitoring and modelling approaches (Weiler and McDonnell, 2004; National Research Council, 2008). Models are important tools for testing hypotheses, understanding hydrological processes and synthesizing experimental data...

  12. Stochastic Modelling of Energy Systems

    DEFF Research Database (Denmark)

    Andersen, Klaus Kaae

    2001-01-01

    equations are expressed in terms of stochastic differential equations. From a theoretical viewpoint the techniques for experimental design, parameter estimation and model validation are considered. From the practical viewpoint emphasis is put on how this methods can be used to construct models adequate...

  13. Wind Energy Management System EMS Integration Project: Incorporating Wind Generation and Load Forecast Uncertainties into Power Grid Operations

    Energy Technology Data Exchange (ETDEWEB)

    Makarov, Yuri V.; Huang, Zhenyu; Etingov, Pavel V.; Ma, Jian; Guttromson, Ross T.; Subbarao, Krishnappa; Chakrabarti, Bhujanga B.

    2010-01-01

    The power system balancing process, which includes the scheduling, real time dispatch (load following) and regulation processes, is traditionally based on deterministic models. Since the conventional generation needs time to be committed and dispatched to a desired megawatt level, the scheduling and load following processes use load and wind and solar power production forecasts to achieve future balance between the conventional generation and energy storage on the one side, and system load, intermittent resources (such as wind and solar generation), and scheduled interchange on the other side. Although in real life the forecasting procedures imply some uncertainty around the load and wind/solar forecasts (caused by forecast errors), only their mean values are actually used in the generation dispatch and commitment procedures. Since the actual load and intermittent generation can deviate from their forecasts, it becomes increasingly unclear (especially, with the increasing penetration of renewable resources) whether the system would be actually able to meet the conventional generation requirements within the look-ahead horizon, what the additional balancing efforts would be needed as we get closer to the real time, and what additional costs would be incurred by those needs. To improve the system control performance characteristics, maintain system reliability, and minimize expenses related to the system balancing functions, it becomes necessary to incorporate the predicted uncertainty ranges into the scheduling, load following, and, in some extent, into the regulation processes. It is also important to address the uncertainty problem comprehensively by including all sources of uncertainty (load, intermittent generation, generators’ forced outages, etc.) into consideration. All aspects of uncertainty such as the imbalance size (which is the same as capacity needed to mitigate the imbalance) and generation ramping requirement must be taken into account. The latter

  14. Stochastic Modelling of Hydrologic Systems

    DEFF Research Database (Denmark)

    Jonsdottir, Harpa

    2007-01-01

    In this PhD project several stochastic modelling methods are studied and applied on various subjects in hydrology. The research was prepared at Informatics and Mathematical Modelling at the Technical University of Denmark. The thesis is divided into two parts. The first part contains an introduct......In this PhD project several stochastic modelling methods are studied and applied on various subjects in hydrology. The research was prepared at Informatics and Mathematical Modelling at the Technical University of Denmark. The thesis is divided into two parts. The first part contains...... an introduction and an overview of the papers published. Then an introduction to basic concepts in hydrology along with a description of hydrological data is given. Finally an introduction to stochastic modelling is given. The second part contains the research papers. In the research papers the stochastic methods...

  15. Hypervirial Models of Stellar Systems

    CERN Document Server

    Evans, N W

    2005-01-01

    A family of cusped potential-density pairs is introduced for modelling galaxies and dark haloes. The density profile is cusped like 1/r^(2-p) at small radii. The distribution function takes the simple form L^(p-2) E^([3p+1]/2) (where E is the binding energy and L is the angular momentum). The models all possess the remarkable property that the virial theorem holds locally, from which they earn their name as the hypervirial family. Famously, this property was first discovered by Eddington to hold for the Plummer model in 1916. In fact, the seductive properties of the Plummer model extend to the whole hypervirial family, including the members possessing the cosmologically important cusps with density behaving like 1/r or 1/r^1.5 or 1/r^1.33. The intrinsic and projected properties of the family of models are discussed in some detail.

  16. Semantic models for adaptive interactive systems

    CERN Document Server

    Hussein, Tim; Lukosch, Stephan; Ziegler, Jürgen; Calvary, Gaëlle

    2013-01-01

    Providing insights into methodologies for designing adaptive systems based on semantic data, and introducing semantic models that can be used for building interactive systems, this book showcases many of the applications made possible by the use of semantic models.Ontologies may enhance the functional coverage of an interactive system as well as its visualization and interaction capabilities in various ways. Semantic models can also contribute to bridging gaps; for example, between user models, context-aware interfaces, and model-driven UI generation. There is considerable potential for using

  17. Model reduction of linear conservative mechanical systems

    NARCIS (Netherlands)

    Schaft, van der A.J.; Oeloff, J.E.

    1990-01-01

    An approach for model reduction of linear conservative or weakly damped mechanical systems is proposed. It is based on the balancing of an associated gradient system. It uses the joint knowledge of the system matrix and the input and output matrices of the Hamiltonian system. The key idea is to asso

  18. Modeling complex work systems - method meets reality

    OpenAIRE

    Veer, van der, C.G.; Hoeve, Machteld; Lenting, Bert F.

    1996-01-01

    Modeling an existing task situation is often a first phase in the (re)design of information systems. For complex systems design, this model should consider both the people and the organization involved, the work, and situational aspects. Groupware Task Analysis (GTA) as part of a method for the design of complex systems, has been applied in a situation of redesign of a Dutch public administration system. The most feasible method to collect information in this case was ethnography, the resulti...

  19. Modeling of power electronic systems with EMTP

    Science.gov (United States)

    Tam, Kwa-Sur; Dravid, Narayan V.

    1989-01-01

    In view of the potential impact of power electronics on power systems, there is need for a computer modeling/analysis tool to perform simulation studies on power systems with power electronic components as well as to educate engineering students about such systems. The modeling of the major power electronic components of the NASA Space Station Freedom Electric Power System is described along with ElectroMagnetic Transients Program (EMTP) and it is demonstrated that EMTP can serve as a very useful tool for teaching, design, analysis, and research in the area of power systems with power electronic components. EMTP modeling of power electronic circuits is described and simulation results are presented.

  20. The effect of effective microorganisms (EM) on EBPR in modified contact stabilization system

    OpenAIRE

    Ehab M. Rashed; Mohamed Massoud

    2015-01-01

    Excessive phosphorus can cause eutrophication in water bodies and needs to be reduced in most wastewaters before discharge to receiving waters. The enhanced biological phosphorus removal (EBPR) process has been shown to be an economical and environmentally compatible method for reducing phosphorus from wastewaters. The experiment has been performed in order to investigate the effect of using effective microorganisms (EM) as an application of Enhanced Biological Phosphorous Removal (EBPR) in m...

  1. Models of the venous system

    DEFF Research Database (Denmark)

    Mehlsen, J

    2000-01-01

    of the venous system require at least three elements: a resistor, a capacitor and an inductor, with the latter being of more importance in the venous than in the arterial system. Non-linearities must be considered in pressure/flow relations in the small venules, during venous collapse, or low flow conditions...

  2. Características da assistência ao trabalho de parto e parto em três modelos de atenção no SUS, no Município de Belo Horizonte, Minas Gerais, Brasil Characteristics of labor and delivery care in three healthcare models within the Unified National Health System in Belo Horizonte, Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    Sibylle Emilie Vogt

    2011-09-01

    Full Text Available Estudo transversal com 831 gestantes, de risco habitual, sobre o manejo do trabalho de parto num Centro de Parto Normal (CPN, num hospital vencedor do título "Galba de Araújo" (HG e numa maternidade com modelo assistencial prevalente (HP. O uso da ocitocina no CPN foi de 27,9%, no HG 59,5% e no HP 40,1%, enquanto a amniotomia foi realizada em 67,6%, 73,6% e 82,2% das mulheres, respectivamente. A realização da episiotomia foi menor nas modalidades com incorporação de práticas humanizadas: 7,2% no CPN e 14,8% no HG versus 54,9% no HP. A prática de oferta liberal no HG resultou numa taxa de analgesia superior (54,4% à do HP (7,7%. O percentual de internação dos recém-nascidos e o de parto a fórceps foram mais altas no HP, mas não houve diferenças para o índice de Apgar e para a taxa de cesárea. Os resultados sugerem resistência ao uso seletivo de intervenções em todos os modelos assistenciais, embora favoreçam o CPN como estratégia no controle das intervenções durante o trabalho de parto e parto nas gestantes de risco habitual sem prejuízos para as mulheres e os recém-nascidos.This cross-sectional study of 831 low-risk pregnancies compared the management of labor and delivery in a birthing center, a hospital that had previously won the "Galba de Araújo" Award (for excellence in obstetric and neonatal care, and a standard-protocol maternity facility. The rates for use of ocytocin during labor were 27.9%, 59.5%, and 40.1%, while amniotomy was performed in 67.6%, 73.6%, and 82.2% of the women, respectively. Episiotomy rates were lower in the first two facilities, which have adopted patient-centered obstetric practices (7.2% at the birthing center and 14.8% at the award-winning hospital as compared to 54.9% at the standard maternity facility. The liberal offer of epidural anesthesia at the awarding-winning hospital resulted in a higher anesthesia rate (54.4% as compared to the standard facility (7.7%. Forceps delivery and

  3. Three-dimensional immersive virtual reality for studying cellular compartments in 3D models from EM preparations of neural tissues

    KAUST Repository

    Cali, Corrado

    2015-07-14

    Advances for application of electron microscopy to serial imaging are opening doors to new ways of analyzing cellular structure. New and improved algorithms and workflows for manual and semiautomated segmentation allow to observe the spatial arrangement of the smallest cellular features with unprecedented detail in full three-dimensions (3D). From larger samples, higher complexity models can be generated; however, they pose new challenges to data management and analysis. Here, we review some currently available solutions and present our approach in detail. We use the fully immersive virtual reality (VR) environment CAVE (cave automatic virtual environment), a room where we are able to project a cellular reconstruction and visualize in 3D, to step into a world created with Blender, a free, fully customizable 3D modeling software with NeuroMorph plug-ins for visualization and analysis of electron microscopy (EM) preparations of brain tissue. Our workflow allows for full and fast reconstructions of volumes of brain neuropil using ilastik, a software tool for semiautomated segmentation of EM stacks. With this visualization environment, we can walk into the model containing neuronal and astrocytic processes to study the spatial distribution of glycogen granules, a major energy source that is selectively stored in astrocytes. The use of CAVE was key to observe a nonrandom distribution of glycogen, and led us to develop tools to quantitatively analyze glycogen clustering and proximity to other subcellular features. This article is protected by copyright. All rights reserved.

  4. Simplicity belies a complex system: a response to the minimal model of immunity of Langman and Cohn.

    Science.gov (United States)

    Efroni, Sol; Cohen, Irun R

    2002-01-01

    Langman and Cohn have written a paper entitled "If the immune repertoire evolved to be large, random, and somatically generated, then em leader " This paper uses reductionist logic to prove that the minimal model of immunity proposed by Langman and Cohn is the only reasonable description of the workings of the immune system. Here we analyze the logic behind this model and show that the complexity of the real immune system contradicts the teachings of Langman and Cohn.

  5. Produtividade de ratos Wistar em diferentes sistemas de acasalamento Productivity of Wistar rats in different mating systems

    Directory of Open Access Journals (Sweden)

    Vania Gomes de Moura Mattaraia

    2012-08-01

    Full Text Available O objetivo foi avaliar a produtividade e uniformidade da produção de ratos Wistar (Rattus norvegicus em três sistemas de acasalamento: monogâmico permanente, com um casal mantido permanentemente em cada gaiola; poligâmico permanente, com duas matrizes e um macho, mantidos permanentemente em cada gaiola; e poligâmico temporário, em que o macho foi mantido na gaiola com duas matrizes até a certificação de cada cópula e, em seguida, foi retirado, retornando após o desmame das ninhadas. Para isso, 69 fêmeas de 90 dias de idade (matrizes foram aleatoriamente distribuídas nos três grupos. As avaliações compreenderam cinco ciclos reprodutivos por matriz. Foram obtidas ninhadas mais pesadas a desmama no sistema poligâmico temporário. Além disso, não houve mortalidade de matrizes neste sistema, o que é um indicador importante de bem estar animal. No sistema monogâmico permanente, o intervalo de tempo necessário para produzir um filhote desmamado por matriz foi menor que nos sistemas poligâmicos. Deve-se considerar, no entanto, que este sistema requer o dobro do número de gaiolas e de machos reprodutores que os poligâmicos. Portanto, o sistema poligâmico temporário pode ser recomendado nas colônias de expansão e produção de ratos Wistar, com a ressalva de que necessita de mão de obra qualificada para identificação de cópula nas matrizes e manejo de rotação dos machos.The objective was to evaluate the productivity and production uniformity of Wistar female rats (Rattus norvegicus submitted to three mating systems: permanent monogamous, with a couple permanently maintained in each cage, permanent polygamous, with two females and one male permanently maintained in each cage, and temporary polygamous in which a male was maintained in a cage with two females until each mating was verified and was removed afterwards, returning after both litters were weaned. For that, 69 90-days-old females were randomly assigned to three

  6. Learning Markov models for stationary system behaviors

    DEFF Research Database (Denmark)

    Chen, Yingke; Mao, Hua; Jaeger, Manfred

    2012-01-01

    Establishing an accurate model for formal verification of an existing hardware or software system is often a manual process that is both time consuming and resource demanding. In order to ease the model construction phase, methods have recently been proposed for automatically learning accurate...... system models from data in the form of observations of the target system. Common for these approaches is that they assume the data to consist of multiple independent observation sequences. However, for certain types of systems, in particular many running embedded systems, one would only have access...... the learned model. Experiments demonstrate that system properties (formulated as stationary probabilities of LTL formulas) can be reliably identified using the learned model....

  7. Integrating systems biology models and biomedical ontologies

    Directory of Open Access Journals (Sweden)

    de Bono Bernard

    2011-08-01

    Full Text Available Abstract Background Systems biology is an approach to biology that emphasizes the structure and dynamic behavior of biological systems and the interactions that occur within them. To succeed, systems biology crucially depends on the accessibility and integration of data across domains and levels of granularity. Biomedical ontologies were developed to facilitate such an integration of data and are often used to annotate biosimulation models in systems biology. Results We provide a framework to integrate representations of in silico systems biology with those of in vivo biology as described by biomedical ontologies and demonstrate this framework using the Systems Biology Markup Language. We developed the SBML Harvester software that automatically converts annotated SBML models into OWL and we apply our software to those biosimulation models that are contained in the BioModels Database. We utilize the resulting knowledge base for complex biological queries that can bridge levels of granularity, verify models based on the biological phenomenon they represent and provide a means to establish a basic qualitative layer on which to express the semantics of biosimulation models. Conclusions We establish an information flow between biomedical ontologies and biosimulation models and we demonstrate that the integration of annotated biosimulation models and biomedical ontologies enables the verification of models as well as expressive queries. Establishing a bi-directional information flow between systems biology and biomedical ontologies has the potential to enable large-scale analyses of biological systems that span levels of granularity from molecules to organisms.

  8. Integrating systems biology models and biomedical ontologies

    Science.gov (United States)

    2011-01-01

    Background Systems biology is an approach to biology that emphasizes the structure and dynamic behavior of biological systems and the interactions that occur within them. To succeed, systems biology crucially depends on the accessibility and integration of data across domains and levels of granularity. Biomedical ontologies were developed to facilitate such an integration of data and are often used to annotate biosimulation models in systems biology. Results We provide a framework to integrate representations of in silico systems biology with those of in vivo biology as described by biomedical ontologies and demonstrate this framework using the Systems Biology Markup Language. We developed the SBML Harvester software that automatically converts annotated SBML models into OWL and we apply our software to those biosimulation models that are contained in the BioModels Database. We utilize the resulting knowledge base for complex biological queries that can bridge levels of granularity, verify models based on the biological phenomenon they represent and provide a means to establish a basic qualitative layer on which to express the semantics of biosimulation models. Conclusions We establish an information flow between biomedical ontologies and biosimulation models and we demonstrate that the integration of annotated biosimulation models and biomedical ontologies enables the verification of models as well as expressive queries. Establishing a bi-directional information flow between systems biology and biomedical ontologies has the potential to enable large-scale analyses of biological systems that span levels of granularity from molecules to organisms. PMID:21835028

  9. Very Large System Dynamics Models - Lessons Learned

    Energy Technology Data Exchange (ETDEWEB)

    Jacob J. Jacobson; Leonard Malczynski

    2008-10-01

    This paper provides lessons learned from developing several large system dynamics (SD) models. System dynamics modeling practice emphasize the need to keep models small so that they are manageable and understandable. This practice is generally reasonable and prudent; however, there are times that large SD models are necessary. This paper outlines two large SD projects that were done at two Department of Energy National Laboratories, the Idaho National Laboratory and Sandia National Laboratories. This paper summarizes the models and then discusses some of the valuable lessons learned during these two modeling efforts.

  10. Precipitation-runoff modeling system; user's manual

    Science.gov (United States)

    Leavesley, G.H.; Lichty, R.W.; Troutman, B.M.; Saindon, L.G.

    1983-01-01

    The concepts, structure, theoretical development, and data requirements of the precipitation-runoff modeling system (PRMS) are described. The precipitation-runoff modeling system is a modular-design, deterministic, distributed-parameter modeling system developed to evaluate the impacts of various combinations of precipitation, climate, and land use on streamflow, sediment yields, and general basin hydrology. Basin response to normal and extreme rainfall and snowmelt can be simulated to evaluate changes in water balance relationships, flow regimes, flood peaks and volumes, soil-water relationships, sediment yields, and groundwater recharge. Parameter-optimization and sensitivity analysis capabilites are provided to fit selected model parameters and evaluate their individual and joint effects on model output. The modular design provides a flexible framework for continued model system enhancement and hydrologic modeling research and development. (Author 's abstract)

  11. Network model of security system

    Directory of Open Access Journals (Sweden)

    Adamczyk Piotr

    2016-01-01

    Full Text Available The article presents the concept of building a network security model and its application in the process of risk analysis. It indicates the possibility of a new definition of the role of the network models in the safety analysis. Special attention was paid to the development of the use of an algorithm describing the process of identifying the assets, vulnerability and threats in a given context. The aim of the article is to present how this algorithm reduced the complexity of the problem by eliminating from the base model these components that have no links with others component and as a result and it was possible to build a real network model corresponding to reality.

  12. ALTM system in Amazonian forest areas; Sistema ALTM em areas da Floresta Amazonica

    Energy Technology Data Exchange (ETDEWEB)

    Sallem Filho, Silas; Bonatto, Amarildo [Esteio Engenharia e Aerolevantamentos S.A., Curitiba, PR (Brazil)

    2005-07-01

    Airborne Laser Scanning provides faster and more accurate Digital Elevation Model and Digital Terrain Model tasks compared to conventional photogrammetry. The system generates Laser pulses towards the terrain, perpendicular to the flight line, scanning the terrain surface and recording the distances from the sensor to the ground for each pulse. The main characteristics of the system is the measurement of the first and the last return for each pulse, allowing the objects identification that are above the ground as, for example, vegetation. With this capability it is possible the determination of volumes and biomass estimate, besides the virtual removal of vegetation covering. The Digital Terrain Models are used for Digital Ortho photos rectification and to obtain contour lines for topography maps. The correct points classification according the elevation, allows the representation of the terrain with larger amount of points than the stereo plotting, in areas densely vegetated where the operator esteems the height of the vegetable covering to interpret the terrain. Some additional products, as hypsometric images and intensity images helps in the identification of features on pipeline projects as well as the obtaining of the obstacles height. (author)

  13. Evaluation Model of System Survivability

    Institute of Scientific and Technical Information of China (English)

    LIU Yuling; PAN Shiying; TIAN Junfeng

    2006-01-01

    This paper puts forward a survivability evaluation model, SQEM(Survivability Quantitative Evaluation Model), based on lucubrating the main method existed. Then it defines the measurement factors and parses the survivability mathematically, introduces state change probability and the idea of setting the weights of survivability factors dynamically into the evaluating process of SQEM, which improved the accuracy of evaluation. An example is presented to illustrate the way SQEM works, which demonstrated the validity and feasibility of the method.

  14. Jogo da Minoria: um modelo baseado em agentes aplicado ao mercado financeiro Minority Game: an agent-based model applied to financial market

    Directory of Open Access Journals (Sweden)

    Antonio Fernando Crepaldi

    2012-12-01

    Full Text Available Nos últimos anos houve uma contribuição significativa dos físicos para a construção de um tipo de modelo baseado em agentes que busca reproduzir, em simulação computacional, o comportamento do mercado financeiro. Esse modelo, chamado Jogo da Minoria consiste de um grupo de agentes que vão ao mercado comprar ou vender ativos. Eles tomam decisões com base em estratégias e, por meio delas, os agentes estabelecem um intrincado jogo de competição e coordenação pela distribuição da riqueza. O modelo tem demonstrado resultados bastante ricos e surpreendentes, tanto na dinâmica do sistema como na capacidade de reproduzir características estatísticas e comportamentais do mercado financeiro. Neste artigo, são apresentadas a estrutura e a dinâmica do Jogo da Minoria, bem como as contribuições recentes relacionadas ao Jogo da Minoria denominado de Grande Canônico, que é um modelo mais bem ajustado às características do mercado financeiro e reproduz as regularidades estatísticas do preço dos ativos chamadas fatos estilizados.Over the past ten years physicists have made a significant contribution to the building of an agent-based model to reproduce the behavior of financial markets using computer simulation. This model, called the Minority Game, consists of a group of agents that buy or sell assets. They make decisions based on strategies, and through them the agents establish an intricate game of competition and coordination resulting in the distribution of wealth. The model has shown outstanding surprising results concerning both the dynamics of the system and the ability to reproduce statistical and behavior characteristics of the financial market. In this study, the structure and dynamics of the Minority Game and the recent contributions related to the Grand Canonical Minority game, a model which is better adapted to the characteristics of the financial market and reproduce the statistical regularities of asset prices (called

  15. Soil aggregation in a crop-livestock integration system under no-tillage Agregação do solo em sistema de integração lavoura-pecuária em plantio direto

    Directory of Open Access Journals (Sweden)

    Edicarlos Damacena de Souza

    2010-08-01

    Full Text Available Grazing intensities can influence soil aggregation, which can be temporarily and permanently affected. The objective of this study was to evaluate the aggregate stability in water at the end of a soybean cycle and during pasture development in a crop-livestock integration system under no-tillage and grazing intensities. The experiment was initiated in 2001, in a dystrophic Red Latosol, after soybean harvest. Treatments consisted of pasture (black oat + Italian ryegrass at heights of 10, 20 and 40 cm, grazed by young cattle, and a control (no grazing, followed by soybean cultivation, in a randomized block design. Soil samples were collected at the end of the soybean cycle (May/2007, during animal grazing (September/2007 and at the end of the grazing cycle (November/2007. The grazing period influences aggregate distribution, since in the September sampling (0-5 cm layer, there was a higher proportion of aggregates > 4.76 mm at all grazing intensities. Soil aggregation is higher in no-tillage crop-livestock integration systems in grazed than in ungrazed areas.As intensidades de pastejo podem influenciar o estado de agregação do solo, que pode sofrer alterações temporárias ou permanentes. O objetivo deste estudo foi avaliar a estabilidade dos agregados em água ao final do ciclo da soja e durante o desenvolvimento da pastagem em sistema de integração lavoura-pecuária em plantio direto submetido a intensidades de pastejo. O experimento foi iniciado em 2001, em um Latossolo Vermelho distrófico, após a colheita da soja. Os tratamentos constaram de alturas de manejo da pastagem (aveia-preta + azevém: 10, 20 e 40 cm, com bovinos jovens, e sem pastejo, seguido do cultivo de soja, em delineamento de blocos ao acaso. Amostras de solo foram retiradas nas camadas de 0 a 5, 5 a 10 e 10 a 20 cm. As amostras foram coletadas ao final do ciclo da soja (maio/2007, em pleno pastejo pelos animais (setembro/2007 e ao final do pastejo (novembro/2007. O tempo

  16. Brief history of agricultural systems modeling.

    Science.gov (United States)

    Jones, James W; Antle, John M; Basso, Bruno; Boote, Kenneth J; Conant, Richard T; Foster, Ian; Godfray, H Charles J; Herrero, Mario; Howitt, Richard E; Janssen, Sander; Keating, Brian A; Munoz-Carpena, Rafael; Porter, Cheryl H; Rosenzweig, Cynthia; Wheeler, Tim R

    2017-07-01

    Agricultural systems science generates knowledge that allows researchers to consider complex problems or take informed agricultural decisions. The rich history of this science exemplifies the diversity of systems and scales over which they operate and have been studied. Modeling, an essential tool in agricultural systems science, has been accomplished by scientists from a wide range of disciplines, who have contributed concepts and tools over more than six decades. As agricultural scientists now consider the "next generation" models, data, and knowledge products needed to meet the increasingly complex systems problems faced by society, it is important to take stock of this history and its lessons to ensure that we avoid re-invention and strive to consider all dimensions of associated challenges. To this end, we summarize here the history of agricultural systems modeling and identify lessons learned that can help guide the design and development of next generation of agricultural system tools and methods. A number of past events combined with overall technological progress in other fields have strongly contributed to the evolution of agricultural system modeling, including development of process-based bio-physical models of crops and livestock, statistical models based on historical observations, and economic optimization and simulation models at household and regional to global scales. Characteristics of agricultural systems models have varied widely depending on the systems involved, their scales, and the wide range of purposes that motivated their development and use by researchers in different disciplines. Recent trends in broader collaboration across institutions, across disciplines, and between the public and private sectors suggest that the stage is set for the major advances in agricultural systems science that are needed for the next generation of models, databases, knowledge products and decision support systems. The lessons from history should be

  17. Information modeling system for blast furnace control

    Science.gov (United States)

    Spirin, N. A.; Gileva, L. Y.; Lavrov, V. V.

    2016-09-01

    Modern Iron & Steel Works as a rule are equipped with powerful distributed control systems (DCS) and databases. Implementation of DSC system solves the problem of storage, control, protection, entry, editing and retrieving of information as well as generation of required reporting data. The most advanced and promising approach is to use decision support information technologies based on a complex of mathematical models. The model decision support system for control of blast furnace smelting is designed and operated. The basis of the model system is a complex of mathematical models created using the principle of natural mathematical modeling. This principle provides for construction of mathematical models of two levels. The first level model is a basic state model which makes it possible to assess the vector of system parameters using field data and blast furnace operation results. It is also used to calculate the adjustment (adaptation) coefficients of the predictive block of the system. The second-level model is a predictive model designed to assess the design parameters of the blast furnace process when there are changes in melting conditions relative to its current state. Tasks for which software is developed are described. Characteristics of the main subsystems of the blast furnace process as an object of modeling and control - thermal state of the furnace, blast, gas dynamic and slag conditions of blast furnace smelting - are presented.

  18. Evaluation of JSAF EM Propagation Prediction Methods for Navy Continuous Training Environment/Fleet Synthetic Training Results and Recommendations: Part 1 - Evaluation of Current JSAF EM Propagation Modeling

    Science.gov (United States)

    2012-12-01

    FFACTR” which is a part of the Engineers Refractive Index Prediction System (EREPS) Tactical Decision Aid ( TDA ) developed by what is now SPAWARS SSC San...currently used in JSAF is “FFACTR” which is a part of the Engineers Refractive Index Prediction System (EREPS) Tactical Decision Aid ( TDA ) developed by what...Decision Aid ( TDA ) developed by what is now SPAWARS SSC San Diego in 1988. This model is no longer supported by SPAWARS or any other group and has been

  19. Modelo experimental do carcinossarcoma 256 de Walker em bexiga de ratos Experimental model of Walker 256 carcinosarcoma in rats bladder

    Directory of Open Access Journals (Sweden)

    Conceição Aparecida Dornelas

    2006-02-01

    Full Text Available OBJETIVO: Estudar um modelo animal para tumor de bexiga com Walker 256. MÉTODOS: Bexigas de ratos Wistar foram cateterizadas via uretral e lesão de parede vesical foi realizada por compressão extrínsica, com pequena pinça, após laparotomia. A seguir 0,3 ml de suspensão contendo 3 x 10(5 células viáveis de carcinossarcoma de Walker foram instiladas em cada bexiga. Os animais foram sacrificados após oito e 13 dias. RESULTADOS: O índice de pega do tumor foi de 100%. A média de sobrevida foi de 14,5 dias. CONCLUSÃO: O modelo estudado foi eficiente e poderá levar subsídios para o estudo experimental em tratamentos de carcinomas de bexiga localmente invasivos em ratos.PURPOSE: An animal model to study bladder tumor with Walker 256. METHODS: Bladders rats Wistar was catheterized via urethra and compression lesion of the wall bladder was realized with a little clamping after laparotomy. One total of the 0,3 ml suspension with 3 x 10(5 cels viable of the carcinossarcoma was instilled into each bladder. The animals were sacrificed after eight and 13 days. RESULTS: The index of tumor incidence was 100% and the average of surviving was 14,5 days. CONCLUSION: The model estudied was efficient and will can to take subsidy the study experiemental in treatment of local invasise bladder cancer.

  20. MODELING AND ANALYSIS OF REGIONAL BOUNDARY SYSTEM

    Institute of Scientific and Technical Information of China (English)

    YAN Guangle; WANG Huanchen

    2001-01-01

    In this paper, the problems of modeling and analyzing the system with change able boundary are researched. First, a kind of expanding system is set up, in which the changeable boundary is dealt with as a regional boundary. Then some relative models are developed to describe the regional boundary system. Next, the transition or the driftage of bifurcation points in the system is discussed. A fascinating case is studied in which two or more than two classes of chaotic attractive points coexist together or exist alternatively in the same system. Lastly, an effective new method of chaos avoidance for the system is put forward.

  1. Formal heterogeneous system modeling with SystemC

    DEFF Research Database (Denmark)

    Niaki, Seyed Hosein Attarzadeh; Jakobsen, Mikkel Koefoed; Sulonen, Tero;

    2012-01-01

    Electronic System Level (ESL) design of embedded systems proposes raising the abstraction level of the design entry to cope with the increasing complexity of such systems. To exploit the benefits of ESL, design languages should allow specification of models which are a) heterogeneous, to describe...... different aspects of systems; b) formally defined, for application of analysis and synthesis methods; c) executable, to enable early detection of specification; and d) parallel, to exploit the multi- and many-core platforms for simulation and implementation. We present a modeling library on top of System......C, targeting heterogeneous embedded system design, based on four models of computation. The library has a formal basis where all elements are well defined and lead in construction of analyzable models. The semantics of communication and computation are implemented by the library, which allows the designer...

  2. Grey Box Modelling of Hydrological Systems

    DEFF Research Database (Denmark)

    Thordarson, Fannar Ørn

    The main topic of the thesis is grey box modelling of hydrologic systems, as well as formulation and assessment of their embedded uncertainties. Grey box model is a combination of a white box model, a physically-based model that is traditionally formulated using deterministic ordinary differential...... the lack of fit in state space formulation, and further support decisions for a model expansion. By using stochastic differential equations to formulate the dynamics of the hydrological system, either the complexity of the model can be increased by including the necessary hydrological processes...... in the model, or formulation of process noise can be considered so that it meets the physical limits of the hydrological system and give an adequate description of the embedded uncertainty in model structure. The thesis consists of two parts: a summary report and a part which contains six scientific papers...

  3. System of control, supervision and data acquisition of the Itaipu hydroelectric power plant - SCADA/EMS; Sistema de controle, supervisao e aquisicao de dados de Itaipu - SCADA/EMS

    Energy Technology Data Exchange (ETDEWEB)

    Castella, Marco Cesar; Carvalho, Paulo Roberto Castro de; Ortiz Calcena, Gilberto; Sertich K, Antonio; Lopez Bado, Cesar A.; Aranda Arriola, Ladislao [Itaipu Binacional, PR (Brazil)

    2001-07-01

    The objective of this work is to describe the SCADA / EMS(Supervisory Control and Data Acquisition / Energy Management System) system which have been implanted in the Itaipu hydroelectric power plant, as well as the used technology and the architecture of the computing network. The system has been foreseen to start its operation by october/2001, although there was a real challenge in relation to the fact that the system has been implanted in a power plant in operation, which demands in the need of perfect synchronism among the activities of maintenance, engineering, operation and the system implantation.

  4. A Model-Based Systems Engineering Methodology for Employing Architecture In System Analysis: Developing Simulation Models Using Systems Modeling Language Products to Link Architecture and Analysis

    Science.gov (United States)

    2016-06-01

    ENGINEERING METHODOLOGY FOR EMPLOYING ARCHITECTURE IN SYSTEM ANALYSIS: DEVELOPING SIMULATION MODELS USING SYSTEMS MODELING LANGUAGE PRODUCTS TO LINK... ENGINEERING METHODOLOGY FOR EMPLOYING ARCHITECTURE IN SYSTEM ANALYSIS: DEVELOPING SIMULATION MODELS USING SYSTEMS MODELING LANGUAGE PRODUCTS TO LINK...to model-based systems engineering (MBSE) by formally defining an MBSE methodology for employing architecture in system analysis (MEASA) that presents

  5. System Advisor Model: Flat Plate Photovoltaic Performance Modeling Validation Report

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, J.; Whitmore, J.; Kaffine, L.; Blair, N.; Dobos, A. P.

    2013-12-01

    The System Advisor Model (SAM) is a free software tool that performs detailed analysis of both system performance and system financing for a variety of renewable energy technologies. This report provides detailed validation of the SAM flat plate photovoltaic performance model by comparing SAM-modeled PV system generation data to actual measured production data for nine PV systems ranging from 75 kW to greater than 25 MW in size. The results show strong agreement between SAM predictions and field data, with annualized prediction error below 3% for all fixed tilt cases and below 8% for all one axis tracked cases. The analysis concludes that snow cover and system outages are the primary sources of disagreement, and other deviations resulting from seasonal biases in the irradiation models and one axis tracking issues are discussed in detail.

  6. Modeling Cytoskeletal Active Matter Systems

    Science.gov (United States)

    Blackwell, Robert

    Active networks of filamentous proteins and crosslinking motor proteins play a critical role in many important cellular processes. One of the most important microtubule-motor protein assemblies is the mitotic spindle, a self-organized active liquid-crystalline structure that forms during cell division and that ultimately separates chromosomes into two daughter cells. Although the spindle has been intensively studied for decades, the physical principles that govern its self-organization and function remain mysterious. To evolve a better understanding of spindle formation, structure, and dynamics, I investigate course-grained models of active liquid-crystalline networks composed of microtubules, modeled as hard spherocylinders, in diffusive equilibrium with a reservoir of active crosslinks, modeled as hookean springs that can adsorb to microtubules and and translocate at finite velocity along the microtubule axis. This model is investigated using a combination of brownian dynamics and kinetic monte carlo simulation. I have further refined this model to simulate spindle formation and kinetochore capture in the fission yeast S. pombe. I then make predictions for experimentally realizable perturbations in motor protein presence and function in S. pombe.

  7. Overvoltage of atmospheric origin in distribution systems; Sobretensoes de origem atmosferica em sistemas de distribuicao

    Energy Technology Data Exchange (ETDEWEB)

    Matsuo, Nelson Massakazu

    1996-07-01

    Some fundamental aspects related to lightning surges in distribution systems are focused, covering issues such as frequency of occurrence of over voltages, wave propagation through discontinuity points and discharge current through arrester. Concepts related to statistical analysis of lightning currents are presented together with the way of relating this data to the occurrence of direct strokes and induced surges. A significant reduction in expected number of over voltages is noticed when the lightning currents front time is taken into account. Calculations show that the results for direct strokes and induced over voltages, applying two different expressions for the lateral attraction distance (electro geometrical model and Eriksson's model) are close to each other. The behaviors of the voltage and of the current are analyzed by means of the travelling wave theory, for several types of discontinuities normally encountered in distribution lines. An evaluation on the influence of several parameters in arrester discharge currents was carried out by means of an analytical model and through computer simulations. The analytical model, for lines without neutral wire, includes exact calculation and the use of mathematical expressions obtained through exponential approximation and convolution. The conclusion is that there are some parameters that influence basically the initial stage of the current and others that influence in a more global way, up to the last stage. (author)

  8. Latent heat loss of Holstein cows in a tropical environment: a prediction model Perda de calor latente em vacas Holandesas em ambiente tropical: um modelo de predição

    Directory of Open Access Journals (Sweden)

    Alex Sandro Campos Maia

    2008-10-01

    Full Text Available Nine lactating Holstein cows with average 526 ± 5 kg of BW, five predominantly black and four predominantly white, bred in a tropical region and managed in open pasture were observed to measure cutaneous and respiratory evaporation rates under different environmental conditions. Cows were separated in three weight class: 1 (500 kg. Latent heat loss from cutaneous surface was measured using a ventilated capsule; evaporation in the respiratory system was measured using a facial mask. The results showed that heaviest cows (2 and 3 classes presented the least evaporation rates. When air temperature increased from 10 to 36ºC the relative humidity decreased from 90 to 30%. In these conditions the heat loss by respiratory evaporation increased from 5 to 57 Wm-2, while the heat loss by cutaneous evaporation increased from 30 to 350 Wm-2. The results confirm that latent heat loss was the main way of thermal energy elimination under high air temperatures (>30ºC; cutaneous evaporation was the main mechanism of heat loss, responding for about 85% of the heat loss. A model was presented for the prediction of the latent heat loss that was based on physiological and environmental variables and could be used to estimate the contribution of evaporation to thermoregulation; a second, based on air temperature only, should be used to make a simple characterization of the evaporation process.Nove vacas Holandesas lactantes com 526 ± 5 kg de peso corporal (cinco predominantemente pretas e quatro predominantemente brancas, criadas em região tropical e manejadas em pastagens, foram observadas com os objetivos de determinar simultaneamente as taxas de evaporação cutânea e respiratória em ambiente tropical e desenvolver modelos de predição. Para a medição da perda de calor latente pela superfície corporal, utilizou-se uma cápsula ventilada e, para a perda por respiração, utilizou-se uma máscara facial. Os resultados mostraram que as vacas que tinham

  9. Suppression of EM Fields using Active Control Algorithms and MIMO Antenna System

    Directory of Open Access Journals (Sweden)

    A. Mohammed

    2004-09-01

    Full Text Available Active methods for attenuating acoustic pressure fields have beensuccessfully used in many applications. In this paper we investigatesome of these active control methods in combination with a MIMO antennasystem in order to assess their validity and performance when appliedto electromagnetic fields. The application that we evaluated in thispaper is a model of a mobile phone equipped with one ordinarytransmitting antenna and two actuator-antennas which purpose is toreduce the electromagnetic field at a specific area in space (e.g. atthe human head. Simulation results show the promise of using theadaptive active control algorithms and MIMO system to attenuate theelectromagnetic field power density.

  10. Systemic change increases model projection uncertainty

    NARCIS (Netherlands)

    Verstegen, Judith; Karssenberg, Derek; van der Hilst, Floortje; Faaij, André

    2014-01-01

    Most spatio-temporal models are based on the assumption that the relationship between system state change and its explanatory processes is stationary. This means that model structure and parameterization are usually kept constant over time, ignoring potential systemic changes in this relationship re

  11. Dynamic modeling of the INAPRO aquaponic system

    NARCIS (Netherlands)

    Karimanzira, Divas; Keesman, Karel J.; Kloas, Werner; Baganz, Daniela; Rauschenbach, Thomas

    2016-01-01

    The use of modeling techniques to analyze aquaponics systems is demonstrated with an example of dynamic modeling for the production of Nile tilapia (Oreochromis niloticus) and tomatoes (Solanum lycopersicon) using the innovative double recirculating aquaponic system ASTAF-PRO. For the management and

  12. Modeling complex work systems - method meets reality

    NARCIS (Netherlands)

    van der Veer, Gerrit C.; Hoeve, Machteld; Lenting, Bert

    1996-01-01

    Modeling an existing task situation is often a first phase in the (re)design of information systems. For complex systems design, this model should consider both the people and the organization involved, the work, and situational aspects. Groupware Task Analysis (GTA) as part of a method for the

  13. Modeling complex work systems - method meets reality

    NARCIS (Netherlands)

    Veer, van der Gerrit C.; Hoeve, Machteld; Lenting, Bert F.

    1996-01-01

    Modeling an existing task situation is often a first phase in the (re)design of information systems. For complex systems design, this model should consider both the people and the organization involved, the work, and situational aspects. Groupware Task Analysis (GTA) as part of a method for the desi

  14. System dynamics modelling of situation awareness

    CSIR Research Space (South Africa)

    Oosthuizen, R

    2015-11-01

    Full Text Available . The feedback loops and delays in the Command and Control system also contribute to the complex dynamic behavior. This paper will build on existing situation awareness models to develop a System Dynamics model to support a qualitative investigation through...

  15. Statistical Model Checking for Stochastic Hybrid Systems

    DEFF Research Database (Denmark)

    David, Alexandre; Du, Dehui; Larsen, Kim Guldstrand

    2012-01-01

    This paper presents novel extensions and applications of the UPPAAL-SMC model checker. The extensions allow for statistical model checking of stochastic hybrid systems. We show how our race-based stochastic semantics extends to networks of hybrid systems, and indicate the integration technique ap...

  16. Models of the venous system

    DEFF Research Database (Denmark)

    Mehlsen, J

    2000-01-01

    Cardiac output is largely controlled by venous return, the driving force of which is the energy remaining at the postcapillary venous site. This force is influenced by forces acting close to the right atrium, and internally or externally upon the veins along their course. Analogue models....... The venous capacitance is also non-linear, but may be considered linear under certain conditions. The models have to include time varying pressure sources created by respiration and skeletal muscles, and if the description includes the upright position, the partly unidirectional flow through the venous...

  17. Systematic modelling and simulation of refrigeration systems

    DEFF Research Database (Denmark)

    Rasmussen, Bjarne D.; Jakobsen, Arne

    1998-01-01

    The task of developing a simulation model of a refrigeration system can be very difficult and time consuming. In order for this process to be effective, a systematic method for developing the system model is required. This method should aim at guiding the developer to clarify the purpose of the s......The task of developing a simulation model of a refrigeration system can be very difficult and time consuming. In order for this process to be effective, a systematic method for developing the system model is required. This method should aim at guiding the developer to clarify the purpose...... of the simulation, to select appropriate component models and to set up the equations in a well-arranged way. In this paper the outline of such a method is proposed and examples showing the use of this method for simulation of refrigeration systems are given....

  18. Heating, ventilation and air conditioning system modelling

    Energy Technology Data Exchange (ETDEWEB)

    Whalley, R.; Abdul-Ameer, A. [British University in Dubai (United Arab Emirates)

    2011-03-15

    Heating, ventilation and air conditioning modelling methods, for large scale, spatially dispersed systems are considered. Existing techniques are discussed and proposals for the application of novel analysis approaches are outlined. The use of distributed-lumped parameter procedures enabling the incorporation of the relatively concentrated and significantly dispersed, system element characteristics, is advocated. A dynamic model for a heating, ventilation and air conditioning system comprising inlet and exhaust fans, with air recirculation, heating/cooling and filtration units is presented. Pressure, airflow and temperature predictions within the system are computed following input, disturbance changes and purging operations. The generalised modelling advancements adopted and the applicability of the model for heating, ventilation and air conditioning system simulation, re-configuration and diagnostics is emphasised. The employment of the model for automatic, multivariable controller design purposes is commented upon. (author)

  19. Model Driven Development of Data Sensitive Systems

    DEFF Research Database (Denmark)

    Olsen, Petur

    2014-01-01

    Model-driven development strives to use formal artifacts during the development process. Formal artifacts enables automatic analyses of some aspects of the system under development. This serves to increase the understanding of the (intended) behavior of the system as well as increasing error...... detection and pushing error detection to earlier stages of development. The complexity of modeling and the size of systems which can be analyzed is severely limited when introducing data variables. The state space grows exponentially in the number of variable and the domain size of the variables...... to the values of variables. This theses strives to improve model-driven development of such data-sensitive systems. This is done by addressing three research questions. In the first we combine state-based modeling and abstract interpretation, in order to ease modeling of data-sensitive systems, while allowing...

  20. Modeling and analysis of stochastic systems

    CERN Document Server

    Kulkarni, Vidyadhar G

    2011-01-01

    Based on the author's more than 25 years of teaching experience, Modeling and Analysis of Stochastic Systems, Second Edition covers the most important classes of stochastic processes used in the modeling of diverse systems, from supply chains and inventory systems to genetics and biological systems. For each class of stochastic process, the text includes its definition, characterization, applications, transient and limiting behavior, first passage times, and cost/reward models. Along with reorganizing the material, this edition revises and adds new exercises and examples. New to the second edi

  1. Modelagem por compartimentos para integrar e comunicar conhecimento em nutrição Compartmental modeling to integrate and communicate nutritional knowledge

    Directory of Open Access Journals (Sweden)

    Edgar O. Oviedo-Rondón

    2007-07-01

    Full Text Available Esta palestra tem o objetivo de apresentar e discutir metodologias utilizadas para modelar e integrar o conhecimento clássico em nutrição animal, e o produzido por novas ciências moleculares como nutrigenoma, proteoma e metaboloma. Estas ciências e a bioinformática estão ajudando a expandir rapidamente o conhecimento dos sistemas biológicos de interesse em nutrição animal. Na palestra discutirei como é importante dedicar parte de nosso tempo a integrar o conhecimento existente para esclarecer os problemas em pesquisa, utilizando as ferramentas mais adequadas para evitar duplicação de pesquisas, que causam desperdício de recursos humanos, econômicos, e de tempo. A modelagem matemática por compartimentos utilizando programas de computador pode ser a melhor maneira de acumular estas informações, integrar diferentes descobertas, e comunicar o conhecimento atual dos sistemas, e do metabolismo de nutrientes às novas gerações, e avançar na determinação mais adequada das exigências nutricionais.This presentation aims to present and discuss methodologies used to model and integrate classical knowledge in animal nutrition, and new discoveries produced by new molecular sciences like nutrigenomics, proteomics and metabolomics. These sciences and bioinformatics are helping to expand >very quickly the knowledge of the biological systems of interest in animal nutrition. I will discuss the importance of dedicating part of our efforts to integrate current knowledge to prioritize research problems using the most adequate tools. This will help to avoid research duplication that causes waste of valuable resources. Compartmental mathematical modeling using computer software could be one of the best ways to accumulate this information. It can help to integrate new discoveries, communicate the knowledge about animal systems and nutrient metabolism to a new generation of scientists, and advance to more accurate determination of nutrient

  2. System Convergence in Transport Modelling

    DEFF Research Database (Denmark)

    Rich, Jeppe; Nielsen, Otto Anker; Cantarella, Guilio E.

    2010-01-01

    -of-successive-averages (MSA) have been proposed. Convergence of the MSA under fairly weak regularity conditions was shown in Robbins and Monro (1951). The iteration between demand and assignment ? the external equilibrium ? are in many models either decoupled or follow a very simple iteration pattern. However, as demand...

  3. Models of the venous system

    DEFF Research Database (Denmark)

    Mehlsen, J

    2000-01-01

    . The venous capacitance is also non-linear, but may be considered linear under certain conditions. The models have to include time varying pressure sources created by respiration and skeletal muscles, and if the description includes the upright position, the partly unidirectional flow through the venous...

  4. Systems Engineering Model for ART Energy Conversion

    Energy Technology Data Exchange (ETDEWEB)

    Mendez Cruz, Carmen Margarita [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Rochau, Gary E. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Wilson, Mollye C. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2017-02-01

    The near-term objective of the EC team is to establish an operating, commercially scalable Recompression Closed Brayton Cycle (RCBC) to be constructed for the NE - STEP demonstration system (demo) with the lowest risk possible. A systems engineering approach is recommended to ensure adequate requirements gathering, documentation, and mode ling that supports technology development relevant to advanced reactors while supporting crosscut interests in potential applications. A holistic systems engineering model was designed for the ART Energy Conversion program by leveraging Concurrent Engineering, Balance Model, Simplified V Model, and Project Management principles. The resulting model supports the identification and validation of lifecycle Brayton systems requirements, and allows designers to detail system-specific components relevant to the current stage in the lifecycle, while maintaining a holistic view of all system elements.

  5. Modelo experimental em ratos para o desenvolvimento de pseudoartrose Experimental model in rats for the development of pseudoarthrosis

    Directory of Open Access Journals (Sweden)

    Manoel Luiz Ferreira

    2009-12-01

    Full Text Available OBJETIVO: Descreve-se a técnica de um novo um modelo de pseudoartrose em Rattus norvegicus albinus livre de espécies patogênicas (SPF. MÉTODOS: Os animais foram aleatoriamente distribuídos em dois Grupos: Grupo 1 - Controle (n =6, Grupo 2 - Experimental (n =6. No grupo Controle realizou-se um acesso ao fêmur, seguido da síntese por planos do músculo e da pele. O grupo Experimental foi submetido à osteotomia do fêmur aduzida da confecção de um retalho pediculado de fáscia lata para interposição entre os segmentos resultantes da fratura induzida cirurgicamente. Prosseguiu-se com o alinhamento e aproximação dos segmentos ósseos, mediante uso de fios de náilon introduzidos em orifícios efetuados na extremidade proximal e distal. RESULTADOS: Estudos radiológico e anatomopatológico evidenciaram a ausência de consolidação óssea com persistência de tecido fibro-osteóide decorridos 120 dias de evolução pós-operatória. CONCLUSÃO: O modelo experimental é adequado para a formação de pseudoartrose em ratos.OBJECTIVE: We sought to describe a new model of pseudoarthrosis in rats free of pathogenic species (Rattus norvegicus albinus - SPF. METHODS: The animals were randomly distributed into two groups were used: Group 1 - Control (n =6; Group 2 - Experimental (n =6. In the Control group an access to the femur followed by the synthesis of the muscular and skin layers was done. The Experimental group was submitted to osteotomy of the femur and a pedicle flap of the fascia lata was interposed between the segments resulting from the surgically induced fracture. The procedure was carried on with both alignment and approximation of the fractured bone through the use of mononylon thread introduced into holes created in the proximal and distal. RESULTS: Radiological and anatomopathological studies showed the absence of bone consolidation with persistence of fibro-osteoid tissue up to 120 days of follow-up. CONCLUSION: The

  6. Building multivariate systems biology models

    NARCIS (Netherlands)

    Kirwan, G.M.; Johansson, E.; Kleemann, R.; Verheij, E.R.; Wheelock, A.M.; Goto, S.; Trygg, J.; Wheelock, C.E.

    2012-01-01

    Systems biology methods using large-scale "omics" data sets face unique challenges: integrating and analyzing near limitless data space, while recognizing and removing systematic variation or noise. Herein we propose a complementary multivariate analysis workflow to both integrate "omics" data from

  7. Models of complex attitude systems

    DEFF Research Database (Denmark)

    Sørensen, Bjarne Taulo

    production, food and the environment, technological progress, animal welfare, local employment and the local economy. In addition, the survey included a conjoint task by which participants’ evaluations of the importance of production system attributes were measured. The data were analysed by means of causal...

  8. Adsorption Rate Models for Multicomponent Adsorption Systems

    Institute of Scientific and Technical Information of China (English)

    姚春才

    2004-01-01

    Three adsorption rate models are derived for multicomponent adsorption systems under either pore diffusion or surface diffusion control. The linear driving force (LDF) model is obtained by assuming a parabolic intraparticle concentration profile. Models I and Ⅱ are obtained from the parabolic concentration layer approximation. Examples are presented to demonstrate the usage and accuracy of these models. It is shown that Model I is suitable for batch adsorption calculations and Model Ⅱ provides a good approximation in fixed-bed adsorption processes while the LDF model should not be used in batch adsorption and may be considered acceptable in fixed-bed adsorption where the parameter Ti is relatively large.

  9. Modeling approach suitable for energy system

    Energy Technology Data Exchange (ETDEWEB)

    Goetschel, D. V.

    1979-01-01

    Recently increased attention has been placed on optimization problems related to the determination and analysis of operating strategies for energy systems. Presented in this paper is a nonlinear model that can be used in the formulation of certain energy-conversion systems-modeling problems. The model lends itself nicely to solution approaches based on nonlinear-programming algorithms and, in particular, to those methods falling into the class of variable metric algorithms for nonlinearly constrained optimization.

  10. Development and application of earth system models

    OpenAIRE

    Prinn, Ronald G.

    2012-01-01

    The global environment is a complex and dynamic system. Earth system modeling is needed to help understand changes in interacting subsystems, elucidate the influence of human activities, and explore possible future changes. Integrated assessment of environment and human development is arguably the most difficult and most important “systems” problem faced. To illustrate this approach, we present results from the integrated global system model (IGSM), which consists of coupled submodels address...

  11. Statistical Model Checking for Stochastic Hybrid Systems

    DEFF Research Database (Denmark)

    David, Alexandre; Du, Dehui; Larsen, Kim Guldstrand

    2012-01-01

    This paper presents novel extensions and applications of the UPPAAL-SMC model checker. The extensions allow for statistical model checking of stochastic hybrid systems. We show how our race-based stochastic semantics extends to networks of hybrid systems, and indicate the integration technique...... applied for implementing this semantics in the UPPAAL-SMC simulation engine. We report on two applications of the resulting tool-set coming from systems biology and energy aware buildings....

  12. A model for international border management systems.

    Energy Technology Data Exchange (ETDEWEB)

    Duggan, Ruth Ann

    2008-09-01

    To effectively manage the security or control of its borders, a country must understand its border management activities as a system. Using its systems engineering and security foundations as a Department of Energy National Security Laboratory, Sandia National Laboratories has developed such an approach to modeling and analyzing border management systems. This paper describes the basic model and its elements developed under Laboratory Directed Research and Development project 08-684.

  13. A Conceptual Data Model of Datum Systems

    Science.gov (United States)

    McCaleb, Michael R.

    1999-01-01

    A new conceptual data model that addresses the geometric dimensioning and tolerancing concepts of datum systems, datums, datum features, datum targets, and the relationships among these concepts, is presented. Additionally, a portion of a related data model, Part 47 of STEP (ISO 10303-47), is reviewed and a comparison is made between it and the new conceptual data model.

  14. Modelling of Generic Slung Load System

    DEFF Research Database (Denmark)

    Bisgaard, Morten; Bendtsen, Jan Dimon; La Cour-Harbo, Anders

    2006-01-01

    This paper presents the result of modelling and verification of a generic slung load system using a small-scale helicopter. The model is intended for use in simulation, pilot training, estimation, and control. The model is derived using a redundant coordinate formulation based on Gauss Principle ...

  15. Estudo biomecânico da rigidez da osteossíntese com placas em ponte em tíbias de cadáveres humanos Biomechanical study of the osteosynthesis stiffness with bridging plates in cadaveric tibial models

    Directory of Open Access Journals (Sweden)

    Edwin Eiji Sunada

    2010-01-01

    Full Text Available OBJETIVO: comparar a rigidez de três diferentes montagens de placa em ponte com a da haste intramedular bloqueada, em tíbias de cadáveres com fratura tipo C. MATERIAIS E MÉTODOS: vinte tíbias humanas captadas de cadáveres, submetidas à fratura do tipo C; quinze fixadas com placas em ponte, divididas em 03 grupos, de acordo com o tamanho das placas (10, 14 e 18 furos e 05 fixadas com hastes intramedulares bloqueadas. Todas as tíbias foram expostas a cargas progressivas e semelhantes. Foram medidos os deslocamentos de ambos fragmentos (proximal e distal, nos planos sagital, coronal e axial do espaço, conforme incremento gradual de carga. RESULTADOS: tíbias fixadas com placas em ponte de 18 furos apresentam um comportamento biomecânico semelhante às fixadas com haste intramedular bloqueada. CONCLUSÕES: Em fraturas do tipo C em tíbias há maior mobilidade do segmento ósseo distal no plano coronal, quando a fratura é fixada com placas em ponte de 14 e 18 furos que quando fixada com haste intramedular bloqueada sem fresagem. Apesar dessa maior mobilidade, os movimentos relativos entre os fragmentos fraturários nos GHB e GP18 tendem a ser semelhantes entre si.OBJECTIVE: To compare the stiffness of three different assemblies of bridging plates with intramedullary locking nails in cadaveric models of tibial fractures type C. MATERIALS AND METHODS: Twenty cadaveric tibias subjected to type C fractures; fifteen were fixed with the bridging plate technique and divided into three groups, according to the plate size (10, 14 and 18 holes, and five were fixed with intramedullary nail. All the tibias were exposed to similar and progressive loads. Dislocation of both fragments (proximal and distal was measured on three planes (sagittal, coronal and axial, as the load was increased. RESULTS: tibias fixed with the 18 hole bridging plate have the same biomechanical behavior of tibias fixed with intramedullary locking nails. CONCLUSIONS: In type C

  16. Human performance modeling for system of systems analytics.

    Energy Technology Data Exchange (ETDEWEB)

    Dixon, Kevin R.; Lawton, Craig R.; Basilico, Justin Derrick; Longsine, Dennis E. (INTERA, Inc., Austin, TX); Forsythe, James Chris; Gauthier, John Henry; Le, Hai D.

    2008-10-01

    A Laboratory-Directed Research and Development project was initiated in 2005 to investigate Human Performance Modeling in a System of Systems analytic environment. SAND2006-6569 and SAND2006-7911 document interim results from this effort; this report documents the final results. The problem is difficult because of the number of humans involved in a System of Systems environment and the generally poorly defined nature of the tasks that each human must perform. A two-pronged strategy was followed: one prong was to develop human models using a probability-based method similar to that first developed for relatively well-understood probability based performance modeling; another prong was to investigate more state-of-art human cognition models. The probability-based modeling resulted in a comprehensive addition of human-modeling capability to the existing SoSAT computer program. The cognitive modeling resulted in an increased understanding of what is necessary to incorporate cognition-based models to a System of Systems analytic environment.

  17. Complex system modelling for veterinary epidemiology.

    Science.gov (United States)

    Lanzas, Cristina; Chen, Shi

    2015-02-01

    The use of mathematical models has a long tradition in infectious disease epidemiology. The nonlinear dynamics and complexity of pathogen transmission pose challenges in understanding its key determinants, in identifying critical points, and designing effective mitigation strategies. Mathematical modelling provides tools to explicitly represent the variability, interconnectedness, and complexity of systems, and has contributed to numerous insights and theoretical advances in disease transmission, as well as to changes in public policy, health practice, and management. In recent years, our modelling toolbox has considerably expanded due to the advancements in computing power and the need to model novel data generated by technologies such as proximity loggers and global positioning systems. In this review, we discuss the principles, advantages, and challenges associated with the most recent modelling approaches used in systems science, the interdisciplinary study of complex systems, including agent-based, network and compartmental modelling. Agent-based modelling is a powerful simulation technique that considers the individual behaviours of system components by defining a set of rules that govern how individuals ("agents") within given populations interact with one another and the environment. Agent-based models have become a recent popular choice in epidemiology to model hierarchical systems and address complex spatio-temporal dynamics because of their ability to integrate multiple scales and datasets.

  18. Using Interaction Scenarios to Model Information Systems

    DEFF Research Database (Denmark)

    Bækgaard, Lars; Bøgh Andersen, Peter

    The purpose of this paper is to define and discuss a set of interaction primitives that can be used to model the dynamics of socio-technical activity systems, including information systems, in a way that emphasizes structural aspects of the interaction that occurs in such systems. The primitives...

  19. Port-based modeling of mechatronic systems

    NARCIS (Netherlands)

    Breedveld, Peter C.

    2004-01-01

    Many engineering activities, including mechatronic design, require that a multidomain or ‘multi-physics’ system and its control system be designed as an integrated system. This contribution discusses the background and tools for a port-based approach to integrated modeling and simulation of physical

  20. Lattice models of ionic systems

    Science.gov (United States)

    Kobelev, Vladimir; Kolomeisky, Anatoly B.; Fisher, Michael E.

    2002-05-01

    A theoretical analysis of Coulomb systems on lattices in general dimensions is presented. The thermodynamics is developed using Debye-Hückel theory with ion-pairing and dipole-ion solvation, specific calculations being performed for three-dimensional lattices. As for continuum electrolytes, low-density results for simple cubic (sc), body-centered cubic (bcc), and face-centered cubic (fcc) lattices indicate the existence of gas-liquid phase separation. The predicted critical densities have values comparable to those of continuum ionic systems, while the critical temperatures are 60%-70% higher. However, when the possibility of sublattice ordering as well as Debye screening is taken into account systematically, order-disorder transitions and a tricritical point are found on sc and bcc lattices, and gas-liquid coexistence is suppressed. Our results agree with recent Monte Carlo simulations of lattice electrolytes.

  1. Quantitative Models and Analysis for Reactive Systems

    DEFF Research Database (Denmark)

    Thrane, Claus

    phones and websites. Acknowledging that now more than ever, systems come in contact with the physical world, we need to revise the way we construct models and verification algorithms, to take into account the behavior of systems in the presence of approximate, or quantitative information, provided...... by the environment in which they are embedded. This thesis studies the semantics and properties of a model-based framework for re- active systems, in which models and specifications are assumed to contain quantifiable information, such as references to time or energy. Our goal is to develop a theory of approximation......, by studying how small changes to our models affect the verification results. A key source of motivation for this work can be found in The Embedded Systems Design Challenge [HS06] posed by Thomas A. Henzinger and Joseph Sifakis. It contains a call for advances in the state-of-the-art of systems verification...

  2. Simulation Model of Brushless Excitation System

    Directory of Open Access Journals (Sweden)

    Ahmed N.A.  Alla

    2007-01-01

    Full Text Available Excitation system is key element in the dynamic performance of electric power systems, accurate excitation models are of great importance in simulating and investigating the power system transient phenomena. Parameter identification of the Brushless excitation system was presented. First a block diagram for the EXS parameter was proposed based on the documents and maps in the power station. To identify the parameters of this model, a test procedure to obtain step response, was presented. Using the Genetic Algorithm with the Matlab-software it was possible to identify all the necessary parameters of the model. Using the same measured input signals the response from the standard model showed nearly the same behavior as the excitation system.

  3. Comportamento de vacas mestiças holandês x zebu, em pastagem de Brachiaria decumbens em sistema silvipastoril Behavior of holstein x zebu crossbreed cows grazing Brachiaria decumbens in a silvipastoral system

    Directory of Open Access Journals (Sweden)

    Tania Mara Soares Paes Leme

    2005-06-01

    Full Text Available Estudou-se o comportamento de vacas mestiças Holandês-Zebu, em sistema silvipastoril, avaliando-se o percentual do tempo em que os animais se mantiveram em pé, comendo, ruminando ou em ócio, no verão e no inverno e o tempo em que as vacas se mantiveram ao sol e à sombra e, neste caso, sob qual espécie arbórea. Foram coletados os dados de 32 vacas, em doze dias, seis no inverno e seis no verão, em medidas tomadas a cada 10 minutos, 12 horas por dia (das 6 às 18 h. Os dados foram submetidos à análise de variância e para comparação múltipla entre médias foi usado o teste t de Student, ao nível de 5% de probabilidade. Verificou-se que, no inverno, os animais preferiram ficar mais ao sol do que à sombra. Já no verão, houve preferência em manterem-se em ambientes sombreados, especialmente sob sombras de espécies arbóreas com copas globosas e densas. Na posição deitada, no inverno, os animais preferiram ficar ao sol e no verão a preferência foi pela sombra. Conclui-se que a procura dos animais por ambientes sombreados, durante o verão, mostra a necessidade da provisão de sombra, para que os mesmos possam viver em ambiente que ofereça conforto térmico.The behavior of Holtein x Zebu crossbreed cows was studied in silvipastoral system, taking in account the time spent by the cows in the stand up position, eating, ruminating or in inactivity, during the summer and winter times. Measures of the time spent by the cows at sunshine and under the shadow was also taken. Data from 32 cows, were collected every ten minutes, 12 hours a day (from 6 A.M. to 6 P.M., in twelve days, six during the winter and six during the summer times. The data were analyzed through variance system and to multiple comparison among average it was used the t test of student, at the level of 5% of probability. During the winter, cows spent more time at sunshine than in summer time while in the summer the cows remained more time in the shadow mainly under

  4. Modelo experimental de hérnia ventral em ratos Experimental model of ventral hernia in rats

    Directory of Open Access Journals (Sweden)

    Yara Juliano

    2002-03-01

    Full Text Available O objetivo deste experimento foi estudar o comportamento de defeitos provocados na parede abdominal, com a finalidade de estabelecer um modelo de hérnia ventral em ratos. Cem ratos com peso entre 230 e 260 g e idade de três meses foram distribuídos em dois grupos. No grupo I, os animais foram submetidos a uma incisão padronizada na linha alba. No grupo II, os animais foram submetidos à exérese padronizada músculo-aponeurótica da região anterior do abdome. Em ambos os grupos, os animais foram redistribuídos em três subgrupos (A, B e C, conforme o tempo de observação de 15, 30 e 45 dias, respectivamente. Nas hérnias desenvolvidas, foram analisados dimensões lineares e volume, presença de aderências e aspectos histológicos de fragmentos do saco herniário. Para análise de resultados, foram empregados testes estatísticos. Os animais dos subgrupos I A, I B e I C, respectivamente, 93,3%, 45% e 53,3%, e dos subgrupos II A, II B e II C, respectivamente, 66,7%, 35% e 47,7%, desenvolveram hérnias. Em ambos os grupos, as medidas do eixo maior dos ânulos herniários ultrapassaram 3 centímetros e os volumes, em média, superiores a 3 mL, classificando-as como hérnias de grandes dimensões. Aderências foram encontradas praticamente em todos os animais. A mortalidade pós-operatória foi em média de 8%, no grupo I, e de 18%, no grupo II, sendo a evisceração a causa dos óbitos. O estudo histológico mostrou maturação do saco herniário aos 30 dias de observação em ambos os grupos. De acordo com os resultados obtidos, o modelo incisão (grupo I foi o mais adequado para simular hérnia ventral no rato, apesar de não ter havido desenvolvimento de hérnia em todos os animais.The behavior of the defect provoked in the abdominal wall, with the purpose of establishing a model of ventral hernia in rats, was the objective of this study. Hundred and thirteen rats weighting from 230 to 260g and 3 months fase were distributed in two groups

  5. Mechatronic Systems Design Methods, Models, Concepts

    CERN Document Server

    Janschek, Klaus

    2012-01-01

    In this textbook, fundamental methods for model-based design of mechatronic systems are presented in a systematic, comprehensive form. The method framework presented here comprises domain-neutral methods for modeling and performance analysis: multi-domain modeling (energy/port/signal-based), simulation (ODE/DAE/hybrid systems), robust control methods, stochastic dynamic analysis, and quantitative evaluation of designs using system budgets. The model framework is composed of analytical dynamic models for important physical and technical domains of realization of mechatronic functions, such as multibody dynamics, digital information processing and electromechanical transducers. Building on the modeling concept of a technology-independent generic mechatronic transducer, concrete formulations for electrostatic, piezoelectric, electromagnetic, and electrodynamic transducers are presented. More than 50 fully worked out design examples clearly illustrate these methods and concepts and enable independent study of th...

  6. Improvements in continuum modeling for biomolecular systems

    CERN Document Server

    Qiao, Yu

    2015-01-01

    Modeling of biomolecular systems plays an essential role in understanding biological processes, such as ionic flow across channels, protein modification or interaction, and cell signaling. The continuum model described by the Poisson-Boltzmann (PB)/Poisson-Nernst-Planck (PNP) equations has made great contributions towards simulation of these processes. However, the model has shortcomings in its commonly used form and cannot capture (or cannot accurately capture) some important physical properties of biological systems. Considerable efforts have been made to improve the continuum model to account for discrete particle interactions and to make progress in numerical methods to provide accurate and efficient simulation. This review will summarize recent main improvements in continuum modeling for biomolecular systems, with focus on the size-modified models, the coupling of the classical density functional theory and PNP equations, the coupling of polar and nonpolar interactions, and numerical progress.

  7. Structural system identification: Structural dynamics model validation

    Energy Technology Data Exchange (ETDEWEB)

    Red-Horse, J.R.

    1997-04-01

    Structural system identification is concerned with the development of systematic procedures and tools for developing predictive analytical models based on a physical structure`s dynamic response characteristics. It is a multidisciplinary process that involves the ability (1) to define high fidelity physics-based analysis models, (2) to acquire accurate test-derived information for physical specimens using diagnostic experiments, (3) to validate the numerical simulation model by reconciling differences that inevitably exist between the analysis model and the experimental data, and (4) to quantify uncertainties in the final system models and subsequent numerical simulations. The goal of this project was to develop structural system identification techniques and software suitable for both research and production applications in code and model validation.

  8. FSM Model of a Simple Photovoltaic System

    Directory of Open Access Journals (Sweden)

    Martina Latkova

    2015-01-01

    Full Text Available The paper describes a simulation model of a simple photovoltaic system intended as a tool for testing the use of finite state machines for simulations representing a long-term operation of renewable energy sources. The mathematical model of the photovoltaic system is described first. Then it is used to build a finite state machine model that calculates a power output of the photovoltaic system for changing values of a solar irradiance and a temperature. Data measured on a real photovoltaic installation are used to verify model’s accuracy through its comparison with a previously created and verified Matlab model. The finite state machine model presented in this paper was created using Ptolemy II software.

  9. Simulation-based Manufacturing System Modeling

    Institute of Scientific and Technical Information of China (English)

    卫东; 金烨; 范秀敏; 严隽琪

    2003-01-01

    In recent years, computer simulation appears to be very advantageous technique for researching the resource-constrained manufacturing system. This paper presents an object-oriented simulation modeling method, which combines the merits of traditional methods such as IDEF0 and Petri Net. In this paper, a four-layer-one-angel hierarchical modeling framework based on OOP is defined. And the modeling description of these layers is expounded, such as: hybrid production control modeling and human resource dispatch modeling. To validate the modeling method, a case study of an auto-product line in a motor manufacturing company has been carried out.

  10. Modelling of Generic Slung Load System

    DEFF Research Database (Denmark)

    Bisgaard, Morten; Bendtsen, Jan Dimon; La Cour-Harbo, Anders

    2006-01-01

    of Least Constraint using the Udwadia-Kalaba equation and can be used to model all body to body slung load suspension types. The model gives an intuitive and easy-to-use way of modelling and simulating di erent slung load suspension types and it includes detection and response of wire slacking......This paper presents the result of modelling and verification of a generic slung load system using a small-scale helicopter. The model is intended for use in simulation, pilot training, estimation, and control. The model is derived using a redundant coordinate formulation based on Gauss Principle...

  11. HVDC System Characteristics and Simulation Models

    Energy Technology Data Exchange (ETDEWEB)

    Moon, S.I.; Han, B.M.; Jang, G.S. [Electric Enginnering and Science Research Institute, Seoul (Korea)

    2001-07-01

    This report deals with the AC-DC power system simulation method by PSS/E and EUROSTAG for the development of a strategy for the reliable operation of the Cheju-Haenam interconnected system. The simulation using both programs is performed to analyze HVDC simulation models. In addition, the control characteristics of the Cheju-Haenam HVDC system as well as Cheju AC system characteristics are described in this work. (author). 104 figs., 8 tabs.

  12. Modeling the Dynamics of an Information System

    Directory of Open Access Journals (Sweden)

    Jacek Unold

    2003-11-01

    Full Text Available The article concentrates on the nature of a social subsystem of an information system. It analyzes the nature of information processes of collectivity within an IS and introduces a model of IS dynamics. The model is based on the assumption that a social subsystem of an information system works as a nonlinear dynamic system. The model of IS dynamics is verified on the indexes of the stock market. It arises from the basic assumption of the technical analysis of the markets, that is, the index chart reflects the play of demand and supply, which in turn represents the crowd sentiment on the market.

  13. Systematic modelling and simulation of refrigeration systems

    DEFF Research Database (Denmark)

    Rasmussen, Bjarne D.; Jakobsen, Arne

    1998-01-01

    The task of developing a simulation model of a refrigeration system can be very difficult and time consuming. In order for this process to be effective, a systematic method for developing the system model is required. This method should aim at guiding the developer to clarify the purpose...... of the simulation, to select appropriate component models and to set up the equations in a well-arranged way. In this paper the outline of such a method is proposed and examples showing the use of this method for simulation of refrigeration systems are given....

  14. MODEL DRIVEN DEVELOPMENT OF ONLINE BANKING SYSTEMS

    Directory of Open Access Journals (Sweden)

    Bresfelean Vasile Paul

    2011-07-01

    Full Text Available In case of online applications the cycle of software development varies from the routine. The online environment, the variety of users, the treatability of the mass of information created by them, the reusability and the accessibility from different devices are all factors of these systems complexity. The use of model drive approach brings several advantages that ease up the development process. Working prototypes that simplify client relationship and serve as the base of model tests can be easily made from models describing the system. These systems make possible for the banks clients to make their desired actions from anywhere. The user has the possibility of accessing information or making transactions.

  15. Development and Integration of Control System Models

    Science.gov (United States)

    Kim, Young K.

    1998-01-01

    The computer simulation tool, TREETOPS, has been upgraded and used at NASA/MSFC to model various complicated mechanical systems and to perform their dynamics and control analysis with pointing control systems. A TREETOPS model of Advanced X-ray Astrophysics Facility - Imaging (AXAF-1) dynamics and control system was developed to evaluate the AXAF-I pointing performance for Normal Pointing Mode. An optical model of Shooting Star Experiment (SSE) was also developed and its optical performance analysis was done using the MACOS software.

  16. EMS database server and Web distribution system%EMS数据服务器和Web发布系统

    Institute of Scientific and Technical Information of China (English)

    彭波; 周良松; 夏成军; 胡会骏; 万磊; 张晓; 刘林; 马立新

    2003-01-01

    目前大多数能量管理系统EMS(Energy Management System)在电力系统实际应用中因缺乏标准数据库和应用程序接口,不能方便地进行应用软件开发,制约了与其他系统的数据共享和集成,而且缺乏便利的信息发布等问题.在吉林电网EMS(SPIDER系统)上,进行了EMS数据服务器和Web发布系统的研究和实施.通过将EMS数据实时转换复制到专用的EMS数据服务器上,并构建一个分布式的EMS数据应用系统,为其他基于EMS数据的软件系统提供了标准、开放的数据库接口及标准的软件开发和用户界面环境.

  17. Models for the study of whole systems.

    Science.gov (United States)

    Bell, Iris R; Koithan, Mary

    2006-12-01

    This article summarizes a network and complex systems science model for research on whole systems of complementary and alternative medicine (CAM) such as homeopathy and traditional Chinese medicine. The holistic concepts of networks and nonlinear dynamical complex systems are well matched to the global and interactive perspectives of whole systems of CAM, whereas the reductionistic science model is well matched to the isolated local organ, cell, and molecular mechanistic perspectives of pharmaceutically based biomedicine. Whole systems of CAM are not drugs with specific actions. The diagnostic and therapeutic approaches of whole systems of CAM produce effects that involve global and patterned shifts across multiple subsystems of the person as a whole. For homeopathy, several characteristics of complex systems, including the probabilistic nature of attractor patterns, variable sensitivity of complex systems to initial conditions, and emergent behaviors in the evolution of a system in its full environmental context over time, could help account for the mixed basic science and controlled clinical trial research findings, in contrast with the consistently positive outcomes of observational studies in the literature. Application of theories and methods from complex systems and network science can open a new era of advances in understanding factors that lead to good versus poor individual global outcome patterns and to rational triage of patients to one type of care over another. The growing reliance on complex systems thinking and systems biology for cancer research affords a unique opportunity to bridge between the CAM and conventional medical worlds with some common language and conceptual models.

  18. Combining ground-based and airborne EM through Artificial Neural Networks for modelling hydrogeological units under saline groundwater conditions

    Directory of Open Access Journals (Sweden)

    J. L. Gunnink

    2012-03-01

    Full Text Available Airborne Electro Magnetic (EM methods supply data over large areas in a cost-effective way. We used Artificial Neural Networks (ANN to classify the geophysical signal into a meaningful geological parameter. By using examples of known relations between ground-based geophysical data (in this case electrical conductivity, EC, from Electrical Cone Penetration Tests and geological parameters (presence of glacial till, we extracted learning rules that could be applied to map the presence of a glacial till using the EC profiles from the airborne EM data. The saline groundwater in the area was obscuring the EC signal from the till but by using ANN we were able to extract subtle and often non-linear, relations in EC that were representative for the presence of the till. The ANN results were interpreted as the probability of having till and showed a good agreement with drilling data. The glacial till is acting as a layer that inhibits groundwater flow, due to its high clay-content, and is therefore an important layer in hydrogeological modelling and for predicting the effects of climate change on groundwater quantity and quality.

  19. Use of an operational model evaluation system for model intercomparison

    Energy Technology Data Exchange (ETDEWEB)

    Foster, K. T., LLNL

    1998-03-01

    The Atmospheric Release Advisory Capability (ARAC) is a centralized emergency response system used to assess the impact from atmospheric releases of hazardous materials. As part of an on- going development program, new three-dimensional diagnostic windfield and Lagrangian particle dispersion models will soon replace ARAC`s current operational windfield and dispersion codes. A prototype model performance evaluation system has been implemented to facilitate the study of the capabilities and performance of early development versions of these new models relative to ARAC`s current operational codes. This system provides tools for both objective statistical analysis using common performance measures and for more subjective visualization of the temporal and spatial relationships of model results relative to field measurements. Supporting this system is a database of processed field experiment data (source terms and meteorological and tracer measurements) from over 100 individual tracer releases.

  20. Evaluation of SystemC Modelling of Reconfigurable Embedded Systems

    CERN Document Server

    Rissa, Tero; Luk, Wayne

    2011-01-01

    This paper evaluates the use of pin and cycle accurate SystemC models for embedded system design exploration and early software development. The target system is MicroBlaze VanillaNet Platform running MicroBlaze uClinux operating system. The paper compares Register Transfer Level (RTL) Hardware Description Language (HDL) simulation speed to the simulation speed of several different SystemC models. It is shown that simulation speed of pin and cycle accurate models can go up to 150 kHz, compared to 100 Hz range of HDL simulation. Furthermore, utilising techniques that temporarily compromise cycle accuracy, effective simulation speed of up to 500 kHz can be obtained.

  1. Modeling of Generic Slung Load System

    DEFF Research Database (Denmark)

    Bisgaard, Morten; Bendtsen, Jan Dimon; la Cour-Harbo, Anders

    2009-01-01

    This paper presents the result of the modelling and verification of a generic slung load system using a small-scale helicopter. The model is intended for use in simulation, pilot training, estimation, and control. The model is derived using a redundant coordinate formulation based on Gauss......' Principle of Least Constraint using the Udwadia-Kalaba equation and can be used to model all body to body slung load suspension types. The model provides intuitive and easy-to-use means of modelling and simulating different slung load suspension types. It includes detection of, and response to, wire...... slackening and tightening as well as aerodynamic coupling between the helicopter and the load. Furthermore, it is shown how the model can be easily used for multi-lift systems either with multiple helicopters or multiple loads. A numerical stabilisation algorithm is introduced and finally the use...

  2. Systems Evaluation Methods, Models, and Applications

    CERN Document Server

    Liu, Siefeng; Xie, Naiming; Yuan, Chaoqing

    2011-01-01

    A book in the Systems Evaluation, Prediction, and Decision-Making Series, Systems Evaluation: Methods, Models, and Applications covers the evolutionary course of systems evaluation methods, clearly and concisely. Outlining a wide range of methods and models, it begins by examining the method of qualitative assessment. Next, it describes the process and methods for building an index system of evaluation and considers the compared evaluation and the logical framework approach, analytic hierarchy process (AHP), and the data envelopment analysis (DEA) relative efficiency evaluation method. Unique

  3. Analytical performance modeling for computer systems

    CERN Document Server

    Tay, Y C

    2013-01-01

    This book is an introduction to analytical performance modeling for computer systems, i.e., writing equations to describe their performance behavior. It is accessible to readers who have taken college-level courses in calculus and probability, networking and operating systems. This is not a training manual for becoming an expert performance analyst. Rather, the objective is to help the reader construct simple models for analyzing and understanding the systems that they are interested in.Describing a complicated system abstractly with mathematical equations requires a careful choice of assumpti

  4. Ângulo de giro e espaçamento entre carreadores em sistemas autopropelidos de irrigação com o aspersor Plona-RL400 Wetted angle and towpath spacing for traveling gun systems with the Plona-RL400 gun sprinkler model

    Directory of Open Access Journals (Sweden)

    Giuliani do Prado

    2007-08-01

    Full Text Available Valores determinados em laboratório, de vazão, raio de alcance e do perfil radial de aplicação de água do aspersor canhão PLONA-RL400, foram utilizados em simulações digitais da uniformidade de aplicação de água desse aspersor operando, na ausência de ventos, com diferentes ângulos de giro e espaçamentos entre carreadores, em sistemas autopropelidos de irrigação. Os valores simulados de uniformidade de aplicação de água foram apresentados em três grupos distintos, cada um dos quais representando condições operacionais (bocal e pressão que determinam a ocorrência da mesma forma geométrica (I, II ou III do perfil radial adimensional de aplicação de água do aspersor avaliado. Para os perfis do tipo I, II e III, observou-se que espaçamentos de carreadores menores que 50% do diâmetro molhado ou situados entre 80 e 90% do diâmetro molhado proporcionaram os maiores valores de uniformidade. Em todas as formas geométricas do perfil, os melhores valores de uniformidade de aplicação de água foram obtidos com ângulos de giro do aspersor entre 180 e 210º.Values of flow rate, radius of throw and radial precipitation profile obtained in laboratory with the PLONA-RL400 gun sprinkler are presented. These values were used on digital simulations of water application uniformity, under no wind conditions, provided by traveling gun machines operating with this sprinkler under different combinations of wetted angle and towpath spacing. Simulated uniformity values were presented arranged under three different clusters, each one corresponding to a different set of sprinkler operational conditions (nozzle versus service pressure that results on the same geometrical shape (I, II or III of PLONA-RL400 radial precipitation profile. For the three profile shapes, it was observed that towpath spacings shorter than 50% of the sprinkler wetted diameter and on the range between 80 and 90% of the sprinkler wetted diameter provide higher

  5. Modeling the variation trends of glacier systems

    Directory of Open Access Journals (Sweden)

    Z. Xie

    2013-01-01

    Full Text Available The basic principles and methods for a functional glacier systems model are introduced and applied for glaciers of Northwest China. When running the model we assume that a glacier system is under steady state conditions in the initial year. The median size of a glacier system is used as representative for the system. The curve of glacier area distribution against elevation is used to compute the increase in equilibrium line altitude (ELA, and the annual glacier ablation is calculated using a global formula a = 1.33(9.66 + ts².⁸⁵ [4, p. 96]. The net mass balance near the ELA under steady state conditions represents the net mass balance of the whole glacier system, and the time required for glacier runoff to return to the initial year level is calculated according to the law of glacier runoff variation, and used to calculate the variation of glacier area. The variation of glacier runoff is modeled according to ablation at the ELA, and the variation of glacier volume is modeled according to the absolute value of the mass balance. The observed changes in surveyed glaciers in China over recent decades were broadly consistent with predictions of the glacier system model. The model therefore offers a reliable method for the prediction of changes in glacier systems in response to changing climate.

  6. Photovoltaic System Modeling. Uncertainty and Sensitivity Analyses

    Energy Technology Data Exchange (ETDEWEB)

    Hansen, Clifford W. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Martin, Curtis E. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2015-08-01

    We report an uncertainty and sensitivity analysis for modeling AC energy from ph otovoltaic systems . Output from a PV system is predicted by a sequence of models. We quantify u ncertainty i n the output of each model using empirical distribution s of each model's residuals. We propagate uncertainty through the sequence of models by sampli ng these distributions to obtain a n empirical distribution of a PV system's output. We consider models that: (1) translate measured global horizontal, direct and global diffuse irradiance to plane - of - array irradiance; (2) estimate effective irradiance; (3) predict cell temperature; (4) estimate DC voltage, current and power ; (5) reduce DC power for losses due to inefficient maximum power point tracking or mismatch among modules; and (6) convert DC to AC power . O ur analysis consider s a notional PV system com prising an array of FirstSolar FS - 387 modules and a 250 kW AC inverter ; we use measured irradiance and weather at Albuquerque, NM. We found the uncertainty in PV syste m output to be relatively small, on the order of 1% for daily energy. We found that unce rtainty in the models for POA irradiance and effective irradiance to be the dominant contributors to uncertainty in predicted daily energy. Our analysis indicates that efforts to reduce the uncertainty in PV system output predictions may yield the greatest improvements by focusing on the POA and effective irradiance models.

  7. ACCUMULATION OF NITROGEN COMPOUNDS AND NITRATE REDUCTASE ACTIVITY IN LETTUCE CULTIVATED IN DIFFERENT CROP SYSTEMS ACÚMULO DE COMPOSTOS NITROGENADOS E ATIVIDADE DA REDUTASE DO NITRATO EM ALFACE PRODUZIDA EM DIFERENTES SISTEMAS DE CULTIVO

    Directory of Open Access Journals (Sweden)

    Fernanda Nunes Ibrahim

    2008-09-01

    Full Text Available

    Nitrate content determination is important for food quality evaluation, therefore when ingested nitrate is reduced the nitrite, which can generate harmful compounds to the human organism. Ahead of this, the present work had as objective to study the transport and accumulation of nitrogen compounds and the nitrate reductase activity in lettuce cultivar 'Vera' produced in Registro (SP in different cropping systems. Were collected samples of the xylem sap, aerial part and root for quantification of nitrogen compounds and of the reductase activity <em>in vivoem>. The nitrate concentration in the xylem sap, the nitrate and amino acids contents, as well as the nitrate reductase activity, demonstrated more intense transport, accumulation and assimilation in plants cultivated in in hydroponic solution, followed of the conventional system and finally, of the organic. The stem of the plant in the three systems of culture presented high capacity of accumulation and assimilation the nitrogen compounds. The nitrate reductase activity in leaves was superior of the root. The content nitrate, independent of the culture system, varied of 24.32 the 800.06 mg kg-1 of FW in the different parts of the plant. However, it did not exceed the maximum

  8. Climate Model Diagnostic Analyzer Web Service System

    Science.gov (United States)

    Lee, S.; Pan, L.; Zhai, C.; Tang, B.; Kubar, T. L.; Li, J.; Zhang, J.; Wang, W.

    2015-12-01

    Both the National Research Council Decadal Survey and the latest Intergovernmental Panel on Climate Change Assessment Report stressed the need for the comprehensive and innovative evaluation of climate models with the synergistic use of global satellite observations in order to improve our weather and climate simulation and prediction capabilities. The abundance of satellite observations for fundamental climate parameters and the availability of coordinated model outputs from CMIP5 for the same parameters offer a great opportunity to understand and diagnose model biases in climate models. In addition, the Obs4MIPs efforts have created several key global observational datasets that are readily usable for model evaluations. However, a model diagnostic evaluation process requires physics-based multi-variable comparisons that typically involve large-volume and heterogeneous datasets, making them both computationally- and data-intensive. In response, we have developed a novel methodology to diagnose model biases in contemporary climate models and implementing the methodology as a web-service based, cloud-enabled, provenance-supported climate-model evaluation system. The evaluation system is named Climate Model Diagnostic Analyzer (CMDA), which is the product of the research and technology development investments of several current and past NASA ROSES programs. The current technologies and infrastructure of CMDA are designed and selected to address several technical challenges that the Earth science modeling and model analysis community faces in evaluating and diagnosing climate models. In particular, we have three key technology components: (1) diagnostic analysis methodology; (2) web-service based, cloud-enabled technology; (3) provenance-supported technology. The diagnostic analysis methodology includes random forest feature importance ranking, conditional probability distribution function, conditional sampling, and time-lagged correlation map. We have implemented the

  9. CTBT integrated verification system evaluation model supplement

    Energy Technology Data Exchange (ETDEWEB)

    EDENBURN,MICHAEL W.; BUNTING,MARCUS; PAYNE JR.,ARTHUR C.; TROST,LAWRENCE C.

    2000-03-02

    Sandia National Laboratories has developed a computer based model called IVSEM (Integrated Verification System Evaluation Model) to estimate the performance of a nuclear detonation monitoring system. The IVSEM project was initiated in June 1994, by Sandia's Monitoring Systems and Technology Center and has been funded by the U.S. Department of Energy's Office of Nonproliferation and National Security (DOE/NN). IVSEM is a simple, ''top-level,'' modeling tool which estimates the performance of a Comprehensive Nuclear Test Ban Treaty (CTBT) monitoring system and can help explore the impact of various sensor system concepts and technology advancements on CTBT monitoring. One of IVSEM's unique features is that it integrates results from the various CTBT sensor technologies (seismic, in sound, radionuclide, and hydroacoustic) and allows the user to investigate synergy among the technologies. Specifically, IVSEM estimates the detection effectiveness (probability of detection), location accuracy, and identification capability of the integrated system and of each technology subsystem individually. The model attempts to accurately estimate the monitoring system's performance at medium interfaces (air-land, air-water) and for some evasive testing methods such as seismic decoupling. The original IVSEM report, CTBT Integrated Verification System Evaluation Model, SAND97-25 18, described version 1.2 of IVSEM. This report describes the changes made to IVSEM version 1.2 and the addition of identification capability estimates that have been incorporated into IVSEM version 2.0.

  10. CTBT integrated verification system evaluation model supplement

    Energy Technology Data Exchange (ETDEWEB)

    EDENBURN,MICHAEL W.; BUNTING,MARCUS; PAYNE JR.,ARTHUR C.; TROST,LAWRENCE C.

    2000-03-02

    Sandia National Laboratories has developed a computer based model called IVSEM (Integrated Verification System Evaluation Model) to estimate the performance of a nuclear detonation monitoring system. The IVSEM project was initiated in June 1994, by Sandia's Monitoring Systems and Technology Center and has been funded by the U.S. Department of Energy's Office of Nonproliferation and National Security (DOE/NN). IVSEM is a simple, ''top-level,'' modeling tool which estimates the performance of a Comprehensive Nuclear Test Ban Treaty (CTBT) monitoring system and can help explore the impact of various sensor system concepts and technology advancements on CTBT monitoring. One of IVSEM's unique features is that it integrates results from the various CTBT sensor technologies (seismic, in sound, radionuclide, and hydroacoustic) and allows the user to investigate synergy among the technologies. Specifically, IVSEM estimates the detection effectiveness (probability of detection), location accuracy, and identification capability of the integrated system and of each technology subsystem individually. The model attempts to accurately estimate the monitoring system's performance at medium interfaces (air-land, air-water) and for some evasive testing methods such as seismic decoupling. The original IVSEM report, CTBT Integrated Verification System Evaluation Model, SAND97-25 18, described version 1.2 of IVSEM. This report describes the changes made to IVSEM version 1.2 and the addition of identification capability estimates that have been incorporated into IVSEM version 2.0.

  11. Secagem de café em combinação A combined system for coffee drying

    Directory of Open Access Journals (Sweden)

    Adilio F. de Lacerda Filho

    2006-09-01

    Full Text Available Objetivou-se avaliar um sistema de secagem de café, com meia-seca em leito fixo e complementação da secagem em secador de lotes, intermitente, de fluxos concorrentes, em um experimento instalado na Área de Pré-processamento e Armazenamento de Produtos Vegetais, DEA-UFV. Utilizou-se delineamento inteiramente casualizado. Fez-se a colheita pelo método de derriça sobre o chão. Os frutos foram pré-processados por via seca, secando-se os frutos verdes, cerejas e passas. Na meia-seca, a umidade inicial dos frutos variou entre 68,9 e 71,3% b.u. e a final entre 44,0 e 47,5% b.u. Na complementação da secagem a umidade final variou entre 12,2 e 13,8% b.u. A temperatura do ar, no secador de leito fixo, variou entre 50,4 e 76 °C, e no de fluxos concorrentes, entre 87,2 e 110 °C. A entalpia específica no secador de leito fixo variou entre 8,4 e 9,1 MJ kg-1 e no de fluxos concorrentes, entre 7,1 e 16,9 MJ kg-1. Relativamente às testemunhas, a qualidade final do produto apresentou melhores características comerciais. Concluiu-se que a meia-seca em leito fixo e a secagem em secador de fluxos concorrentes, além de reduzir o tempo de operação, poderá contribuir para melhor preservar as qualidades que o produto adquire no campo.The general objective of this study was the evaluation of a system for coffee drying, using partial drying in fixed bed dryer and complementary drying in an intermittent concurrent flow batch dryer. The experiment was carried out in the Vegetable Products Processing Area, DEA-UFV. The drying tests were accomplished in completely randomized design. The coffee was harvested on the ground by manual striping process. The fruits were pre-processed by drying of ripe, overripe and greenish cherries. For the preliminary drying, the initial coffee moisture content varied from 68.9 to 71.3% w.b. with the drying being interrupted with moisture content between 44.0 and 47.5% w.b. In the complementary drying phase the final moisture

  12. Model Updating Nonlinear System Identification Toolbox Project

    Data.gov (United States)

    National Aeronautics and Space Administration — ZONA Technology proposes to develop an enhanced model updating nonlinear system identification (MUNSID) methodology by adopting the flight data with state-of-the-art...

  13. Model and method for optimizing heterogeneous systems

    Science.gov (United States)

    Antamoshkin, O. A.; Antamoshkina, O. A.; Zelenkov, P. V.; Kovalev, I. V.

    2016-11-01

    Methodology of distributed computing performance boost by reduction of delays number is proposed. Concept of n-dimentional requirements triangle is introduced. Dynamic mathematical model of resource use in distributed computing systems is described.

  14. Modelling the evolution of human trail systems

    Science.gov (United States)

    Helbing, Dirk; Keltsch, Joachim; Molnár, Péter

    1997-07-01

    Many human social phenomena, such as cooperation, the growth of settlements, traffic dynamics and pedestrian movement, appear to be accessible to mathematical descriptions that invoke self-organization. Here we develop a model of pedestrian motion to explore the evolution of trails in urban green spaces such as parks. Our aim is to address such questions as what the topological structures of these trail systems are, and whether optimal path systems can be predicted for urban planning. We use an `active walker' model that takes into account pedestrian motion and orientation and the concomitant feedbacks with the surrounding environment. Such models have previously been applied to the study of complex structure formation in physical, chemical and biological systems. We find that our model is able to reproduce many of the observed large-scale spatial features of trail systems.

  15. Power system coherency and model reduction

    CERN Document Server

    Chow, Joe H

    2014-01-01

    This book provides a comprehensive treatment for understanding interarea modes in large power systems and obtaining reduced-order models using the coherency concept and selective modal analysis method.

  16. Propulsion System Models for Rotorcraft Conceptual Design

    Science.gov (United States)

    Johnson, Wayne

    2014-01-01

    The conceptual design code NDARC (NASA Design and Analysis of Rotorcraft) was initially implemented to model conventional rotorcraft propulsion systems, consisting of turboshaft engines burning jet fuel, connected to one or more rotors through a mechanical transmission. The NDARC propulsion system representation has been extended to cover additional propulsion concepts, including electric motors and generators, rotor reaction drive, turbojet and turbofan engines, fuel cells and solar cells, batteries, and fuel (energy) used without weight change. The paper describes these propulsion system components, the architecture of their implementation in NDARC, and the form of the models for performance and weight. Requirements are defined for improved performance and weight models of the new propulsion system components. With these new propulsion models, NDARC can be used to develop environmentally-friendly rotorcraft designs.

  17. Spinal Cord Injury Model System Information Network

    Science.gov (United States)

    ... Go New to Website Managing Bowel Function After Spinal Cord Injury Resilience, Depression and Bouncing Back after SCI Getting ... the UAB-SCIMS Contact the UAB-SCIMS UAB Spinal Cord Injury Model System Newly Injured Health Daily Living Consumer ...

  18. Systemic Therapy: A New Brief Intervention Model.

    Science.gov (United States)

    Searight, H. Russell; Openlander, Patrick

    1984-01-01

    Describes a newly developing mode of problem-oriented brief therapy. The systemic therapy model emphasizes the interactional context of clients' problems and represents an efficient intervention paradigm. (Author/JAC)

  19. Computational Models for Nonlinear Aeroelastic Systems Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Clear Science Corp. and Duke University propose to develop and demonstrate a new and efficient computational method of modeling nonlinear aeroelastic systems. The...

  20. Regional Ocean Modeling System (ROMS): Samoa

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Regional Ocean Modeling System (ROMS) 7-day, 3-hourly forecast for the region surrounding the islands of Samoa at approximately 3-km resolution. While considerable...

  1. Regional Ocean Modeling System (ROMS): CNMI

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Regional Ocean Modeling System (ROMS) 7-day, 3-hourly forecast for the region surrounding the Commonwealth of the Northern Mariana Islands (CNMI) at approximately...

  2. Forecasting Models in the State Education System

    Directory of Open Access Journals (Sweden)

    Gintautas DZEMYDA

    2003-04-01

    Full Text Available This paper presents model-based assessment and forecasting of the Lithuanian education system in the period of 2001-2010. In order to obtain satisfactory forecasting results, constructing of models used for these aims should be grounded on some interactive data mining. Data mining of data stored in the system of the Lithuanian teacher's database and of data from other sources representing the state of education system and the demographic changes in Lithuania was used. The models cover the estimation of data quality in the databases, the analysis of flow of teachers and pupils, the clustering of schools, the model of dynamics of pedagogical staff and pupils, and the quality analysis of teachers. The main results of forecasting and integrated analysis of the Lithuanian teachers' database with other data reflecting the state of the education system and demographic changes in Lithuania are presented.

  3. System Identification, Environmental Modelling, and Control System Design

    CERN Document Server

    Garnier, Hugues

    2012-01-01

    System Identification, Environmetric Modelling, and Control Systems Design is dedicated to Professor Peter Young on the occasion of his seventieth birthday. Professor Young has been a pioneer in systems and control, and over the past 45 years he has influenced many developments in this field. This volume is comprised of a collection of contributions by leading experts in system identification, time-series analysis, environmetric modelling and control system design – modern research in topics that reflect important areas of interest in Professor Young’s research career. Recent theoretical developments in and relevant applications of these areas are explored treating the various subjects broadly and in depth. The authoritative and up-to-date research presented here will be of interest to academic researcher in control and disciplines related to environmental research, particularly those to with water systems. The tutorial style in which many of the contributions are composed also makes the book suitable as ...

  4. Manejo do nitrogênio no milho em semeadura direta em sucessão a espécies de cobertura de solo no inverno e em dois locais: II - efeito sobre o rendimento de grãos Nitrogen management in maize in no-till system in succession to winter cover crops at two locations: II - effect on grain yield

    Directory of Open Access Journals (Sweden)

    Gilber Argenta

    1999-12-01

    Full Text Available A liberação de nitrogênio (N de restos culturais depende dos processos de imobilização e mineralização microbiana, que são influenciados pelo ambiente. O objetivo do trabalho foi o de avaliar, em dois locais, os efeitos de dose e época de aplicação de N em milho (0-0; 0-160; 30-130 e 60-100kg/ha, respectivamente, na semeadura e em cobertura, em sistema de semeadura direta, implantado em duas épocas, após a dessecação (1 e aos 20 dias de duas coberturas de solo no inverno (aveia preta e ervilhaca comum e pousio invernal, sobre o rendimento de grãos. Foram conduzidos dois experimentos com suplementação hídrica, sendo um em Eldorado do Sul e outro em Passo Fundo, no estado do Rio Grande do Sul, no ano agrícola 1996/97. A resposta à aplicação de N dependeu do local, da cobertura de solo no inverno e da época de semeadura após a dessecação. Em Eldorado do Sul, a aplicação de N na semeadura aumentou o rendimento de grãos em relação ao tratamento com todo o N em cobertura, independentemente do tipo de planta de cobertura de solo no inverno. Em Passo Fundo, não houve diferença entre os tratamentos com N. O aumento na dose de N na semeadura de 30 para 60kg/ha não afetou o rendimento de grãos, independente do fator testado. O atraso em 20 dias na época de semeadura do milho em sucessão à aveia preta somente foi benéfico em Eldorado do Sul, aumentanto em 34% o rendimento de grãos.The release of nitrogen (N of crop residues depends on the processes of microbial immobilization and mineralization, which are influenced by environment. The objective of this study was to evaluate, at two locations, the effects of rate and timing of N application in maize (0-0; 0-160; 30-130 and 60-100kg/ha, respectively, at sowing and sidedressed, in no-till system, established in two sowing dates after desiccation (1 and 20 days of two winter cover crops (black oat and common vetch and bare area, on grain yield. The experiment was

  5. Heuristic approaches to models and modeling in systems biology

    NARCIS (Netherlands)

    MacLeod, Miles

    2016-01-01

    Prediction and control sufficient for reliable medical and other interventions are prominent aims of modeling in systems biology. The short-term attainment of these goals has played a strong role in projecting the importance and value of the field. In this paper I identify the standard models must m

  6. Manejo do nitrogênio no milho em semeadura direta em sucessão a espécies de cobertura de solo no inverno e em dois locais: I - efeito sobre a absorção de N Nitrogen management in maize in no-till system in succession to winter cover crops in two locations: I - effect on N uptake

    Directory of Open Access Journals (Sweden)

    Gilber Argenta

    1999-12-01

    Full Text Available A permanência de restos culturais sobre a superfície do solo altera os processos de imobilização e mineralização, diminuindo a disponibilidade de nitrogênio para o milho, principalmente, em sucessão a gramíneas. O objetivo do trabalho foi o de avaliar, em dois ambientes, os efeitos de dose e época de aplicação de N no milho (0-0; 0-160; 30-130 e 60-100kg/ha, respectivamente, na semeadura e em cobertura, em sistema de semeadura direta, implantado em duas épocas após a dessecação (1 e aos 20 dias de duas coberturas de solo no inverno (aveia preta e ervilhaca comum e da área em pousio invernal livre de plantas daninhas, sobre a absorção de N. Foram conduzidos dois experimentos com suplementação hídrica, sendo um em Eldorado do Sul e outro em Passo Fundo, no estado do Rio Grande do Sul, no ano agrícola 1996/97. Em Eldorado do Sul, a aplicação de N na semeadura foi benéfica, pois aumentou a absorção de N em relação ao tratamento com todo o N em cobertura, independentemente da cobertura de solo no inverno testada. Em Passo Fundo, somente no estádio de 3-4 folhas, houve vantagem da aplicação de N na semeadura em relação à aplicação total em cobertura sobre a absorção de N. Nos estádios de 6-7 folhas, 10-11 folhas e de pendoamento do milho, não houve diferença entre os tratamentos com N. O atraso na época de semeadura do milho, após a dessecação em 20 dias, mostra-se tecnicamente viável, principalmente quando em sucessão à aveia preta, pois aumentou na média dos sistemas de manejo de N 54 e 75% a absorção de N, no estádio de 3-4 folhas, respectivamente em Eldorado do Sul e em Passo Fundo. A absorção de N no tecido da planta de milho em sucessão à aveia preta foi menor em Eldorado do Sul do que em Passo Fundo, em todos os estádios avaliados. O aumento na dose de N, na semeadura, de 30 para 60kg/ha de N, não se constituiu em estratégia eficiente para aumentar a absorção de N, independentemente

  7. Model of the Human Sleep Wake System

    CERN Document Server

    Rogers, Lisa

    2012-01-01

    A model and analysis of the human sleep/wake system is presented. The model is derived using the known neuronal groups, and their various projections, involved with sleep and wake. Inherent in the derivation is the existence of a slow time scale associated with homeostatic regulation, and a faster time scale associated with the dynamics within the sleep phase. A significant feature of the model is that it does not contain a periodic forcing term, common in other models, reflecting the fact that sleep/wake is not dependent upon a diurnal stimulus. Once derived, the model is analyzed using a linearized stability analysis. We then use experimental data from normal sleep-wake systems and orexin knockout systems to verify the physiological validity of the equations.

  8. Integrated systemic model in the management of stocks and purchases in the administration of results: the financial challenge in the re-stocking
    Modelo sistêmico integrado em gestão de estoques e compras na administração de resultado: o desafio financeiro no ressuprimento

    OpenAIRE

    Mauricio Kalau Gonzáles

    2006-01-01

    When purchases are carried out in the company, it is not only to replace the stock. It is also possible to obtain several financial advantages for the company, to what the working capital management is concerned. However, in order to make it happen positively, the company must have a policy of such an understanding and a decisive system which guides the entrepreneur. It is proposed in this work the creation of such a model of decision. In the literary review about this subject, several confli...

  9. Modelling of Signal - Level Crossing System

    Directory of Open Access Journals (Sweden)

    Daniel Novak

    2006-01-01

    Full Text Available The author presents an object-oriented model of a railway level-crossing system created for the purpose of functional requirements specification. Unified Modelling Language (UML, version 1.4, which enables specification, visualisation, construction and documentation of software system artefacts, was used. The main attention was paid to analysis and design phases. The former phase resulted in creation of use case diagrams and sequential diagrams, the latter in creation of class/object diagrams and statechart diagrams.

  10. A Prison/Parole System Simulation Model,

    Science.gov (United States)

    parole system on future prison and parole populations. A simulation model is presented, viewing a prison / parole system as a feedback process for...ciminal offenders . Transitions among the states in which an offender might be located, imprisoned, paroled , and discharged, are assumed to be in...accordance with a discrete time semi-Markov process. Projected prison and parole populations for sample data and applications of the model are discussed. (Author)

  11. Constructing a systems psychodynamic wellness model

    OpenAIRE

    Sanchen Henning; Frans Cilliers

    2012-01-01

    Orientation: The researchers constructed a Systems Psychodynamic Wellness Model (SPWM) by merging theory and concepts from systems psychodynamics and positive psychology. They then refined the model for application in organisations during a Listening Post (LP) that comprised experienced subject experts.Research purpose: The purpose of the research was to construct and refine the SPWM in order to understand psychological wellness at the individual, group and organisational levels.Motivation fo...

  12. New Directions in Modeling the Lighting Systems

    Directory of Open Access Journals (Sweden)

    P. Fiala

    2004-12-01

    Full Text Available This paper presents information about new directions in the modelingof lighting systems, and an overview of methods for the modeling oflighting systems. The new R-FEM method is described, which is acombination of the Radiosity method and the Finite Elements Method. Thepaper contains modeling results and their verification by experimentalmeasurements and by the Matlab simulation for this R-FEM method.

  13. Quantitative Models and Analysis for Reactive Systems

    DEFF Research Database (Denmark)

    Thrane, Claus

    phones and websites. Acknowledging that now more than ever, systems come in contact with the physical world, we need to revise the way we construct models and verification algorithms, to take into account the behavior of systems in the presence of approximate, or quantitative information, provided......, allowing verification procedures to quantify judgements, on how suitable a model is for a given specification — hence mitigating the usual harsh distinction between satisfactory and non-satisfactory system designs. This information, among other things, allows us to evaluate the robustness of our framework......, by studying how small changes to our models affect the verification results. A key source of motivation for this work can be found in The Embedded Systems Design Challenge [HS06] posed by Thomas A. Henzinger and Joseph Sifakis. It contains a call for advances in the state-of-the-art of systems verification...

  14. Hybrid Energy System Modeling in Modelica

    Energy Technology Data Exchange (ETDEWEB)

    William R. Binder; Christiaan J. J. Paredis; Humberto E. Garcia

    2014-03-01

    In this paper, a Hybrid Energy System (HES) configuration is modeled in Modelica. Hybrid Energy Systems (HES) have as their defining characteristic the use of one or more energy inputs, combined with the potential for multiple energy outputs. Compared to traditional energy systems, HES provide additional operational flexibility so that high variability in both energy production and consumption levels can be absorbed more effectively. This is particularly important when including renewable energy sources, whose output levels are inherently variable, determined by nature. The specific HES configuration modeled in this paper include two energy inputs: a nuclear plant, and a series of wind turbines. In addition, the system produces two energy outputs: electricity and synthetic fuel. The models are verified through simulations of the individual components, and the system as a whole. The simulations are performed for a range of component sizes, operating conditions, and control schemes.

  15. Model Reduction of Fuzzy Logic Systems

    Directory of Open Access Journals (Sweden)

    Zhandong Yu

    2014-01-01

    Full Text Available This paper deals with the problem of ℒ2-ℒ∞ model reduction for continuous-time nonlinear uncertain systems. The approach of the construction of a reduced-order model is presented for high-order nonlinear uncertain systems described by the T-S fuzzy systems, which not only approximates the original high-order system well with an ℒ2-ℒ∞ error performance level γ but also translates it into a linear lower-dimensional system. Then, the model approximation is converted into a convex optimization problem by using a linearization procedure. Finally, a numerical example is presented to show the effectiveness of the proposed method.

  16. Cultivo de manjericão em hidroponia e em diferentes substratos sob ambiente protegido Culture of basil in substrata and hydroponic systems under protected environment

    OpenAIRE

    Fernandes,Priscila C.; Roselaine Facanali; Teixeira,João Paulo F.; Pedro R. Furlani; MARCIA ORTIZ M. MARQUES

    2004-01-01

    Entre as ervas aromáticas, o manjericão possui importância econômica no Brasil, sendo seu consumo tanto in natura quanto para processamento industrial, na obtenção de óleo essencial. Porém, as informações quanto à qualidade aromática dessas plantas em função das técnicas de cultivo são escassas. Avaliou-se a produtividade de duas espécies de manjericão, de folha estreita (Ocimum minimum L.) e de folha larga (Ocimum basilicum L.) em ambiente protegido. Os sistemas de cultivo utilizados foram: ...

  17. <em>In Vitroem> Antioxidant Properties of Flavonoids and Polysaccharides Extract from Tobacco (<em>Nicotiana> em>tabacum> L. Leaves

    Directory of Open Access Journals (Sweden)

    Jing-Lu Wang

    2012-09-01

    Full Text Available In the present study, antioxidant properties of flavonoids and polysaccharides from tobacco (<em>Nicotiana> tabacumem> L. leaves were evaluated in several <em>in vitroem> systems, e.g., scavenging activities on hydroxyl, superoxide anion, 1,1-diphenyl-2-picrylhydrazyl (DPPH and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid (ABTS radicals, and reducing power. Flavonoids showed much better activity than polysaccharides in scavenging activities on free radicals. When compared to the positive control, ascorbic acid, both showed weaker antioxidant potential. However, flavonoids possessed comparable superoxide anion, DPPH and ABTS radical scavenging abilities to ascorbic acid at high concentration (600 μg/mL. Meanwhile, it was found that flavonoids had prominent effects on the reducing power, which was equivalent to ascorbic acid, and was significantly higher than polysaccharides. These results clearly indicate that flavonoids are effective in scavenging free radicals and have the potential to be powerful antioxidants. Thus, tobacco leaves could be considered as a potential source of natural antioxidants for food, pharmaceutical, cosmetics or nutraceutical industries.

  18. Economic model of pipeline transportation systems

    Energy Technology Data Exchange (ETDEWEB)

    Banks, W. F.

    1977-07-29

    The objective of the work reported here was to develop a model which could be used to assess the economic effects of energy-conservative technological innovations upon the pipeline industry. The model is a dynamic simulator which accepts inputs of two classes: the physical description (design parameters, fluid properties, and financial structures) of the system to be studied, and the postulated market (throughput and price) projection. The model consists of time-independent submodels: the fluidics model which simulates the physical behavior of the system, and the financial model which operates upon the output of the fluidics model to calculate the economics outputs. Any of a number of existing fluidics models can be used in addition to that developed as a part of this study. The financial model, known as the Systems, Science and Software (S/sup 3/) Financial Projection Model, contains user options whereby pipeline-peculiar characteristics can be removed and/or modified, so that the model can be applied to virtually any kind of business enterprise. The several dozen outputs are of two classes: the energetics and the economics. The energetics outputs of primary interest are the energy intensity, also called unit energy consumption, and the total energy consumed. The primary economics outputs are the long-run average cost, profit, cash flow, and return on investment.

  19. Cryo-EM structures and atomic model of the HIV-1 strand transfer complex intasome.

    Science.gov (United States)

    Passos, Dario Oliveira; Li, Min; Yang, Renbin; Rebensburg, Stephanie V; Ghirlando, Rodolfo; Jeon, Youngmin; Shkriabai, Nikoloz; Kvaratskhelia, Mamuka; Craigie, Robert; Lyumkis, Dmitry

    2017-01-06

    Like all retroviruses, HIV-1 irreversibly inserts a viral DNA (vDNA) copy of its RNA genome into host target DNA (tDNA). The intasome, a higher-order nucleoprotein complex composed of viral integrase (IN) and the ends of linear vDNA, mediates integration. Productive integration into host chromatin results in the formation of the strand transfer complex (STC) containing catalytically joined vDNA and tDNA. HIV-1 intasomes have been refractory to high-resolution structural studies. We used a soluble IN fusion protein to facilitate structural studies, through which we present a high-resolution cryo-electron microscopy (cryo-EM) structure of the core tetrameric HIV-1 STC and a higher-order form that adopts carboxyl-terminal domain rearrangements. The distinct STC structures highlight how HIV-1 can use the common retroviral intasome core architecture to accommodate different IN domain modules for assembly.

  20. A multilingual programming model for coupled systems.

    Energy Technology Data Exchange (ETDEWEB)

    Ong, E. T.; Larson, J. W.; Norris, B.; Tobis, M.; Steder, M.; Jacob, R. L.; Mathematics and Computer Science; Univ. of Wisconsin; Univ. of Chicago; The Australian National Univ.

    2008-01-01

    Multiphysics and multiscale simulation systems share a common software requirement-infrastructure to implement data exchanges between their constituent parts-often called the coupling problem. On distributed-memory parallel platforms, the coupling problem is complicated by the need to describe, transfer, and transform distributed data, known as the parallel coupling problem. Parallel coupling is emerging as a new grand challenge in computational science as scientists attempt to build multiscale and multiphysics systems on parallel platforms. An additional coupling problem in these systems is language interoperability between their constituent codes. We have created a multilingual parallel coupling programming model based on a successful open-source parallel coupling library, the Model Coupling Toolkit (MCT). This programming model's capabilities reach beyond MCT's native Fortran implementation to include bindings for the C++ and Python programming languages. We describe the method used to generate the interlanguage bindings. This approach enables an object-based programming model for implementing parallel couplings in non-Fortran coupled systems and in systems with language heterogeneity. We describe the C++ and Python versions of the MCT programming model and provide short examples. We report preliminary performance results for the MCT interpolation benchmark. We describe a major Python application that uses the MCT Python bindings, a Python implementation of the control and coupling infrastructure for the community climate system model. We conclude with a discussion of the significance of this work to productivity computing in multidisciplinary computational science.

  1. The Guided System Development Framework: Modeling and Verifying Communication Systems

    DEFF Research Database (Denmark)

    Carvalho Quaresma, Jose Nuno; Probst, Christian W.; Nielson, Flemming

    2014-01-01

    In a world that increasingly relies on the Internet to function, application developers rely on the implementations of protocols to guarantee the security of data transferred. Whether a chosen protocol gives the required guarantees, and whether the implementation does the same, is usually unclear....... The Guided System Development framework contributes to more secure communication systems by aiding the development of such systems. The framework features a simple modelling language, step-wise refinement from models to implementation, interfaces to security verification tools, and code generation from...

  2. EM Scattering from Conducting Flat Plates Coated with Thin RAM

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    According to the equivalence principles, high frequency approximation and boundary conditions, a method has been developed to deal with the EM scattering by a rectangular conducting flat plate coated with uniaxial anisotropic radar absorbing material (RAM). The simple and effective method is available to the system of RCS prediction in which the large complex targets modeled by facets and wedges. Numerical results show some properties of EM scattering by conducting plate coated with thin uniaxial anisotropic RAM.

  3. BioEM: GPU-accelerated computing of Bayesian inference of electron microscopy images

    CERN Document Server

    Cossio, Pilar; Baruffa, Fabio; Rampp, Markus; Lindenstruth, Volker; Hummer, Gerhard

    2016-01-01

    In cryo-electron microscopy (EM), molecular structures are determined from large numbers of projection images of individual particles. To harness the full power of this single-molecule information, we use the Bayesian inference of EM (BioEM) formalism. By ranking structural models using posterior probabilities calculated for individual images, BioEM in principle addresses the challenge of working with highly dynamic or heterogeneous systems not easily handled in traditional EM reconstruction. However, the calculation of these posteriors for large numbers of particles and models is computationally demanding. Here we present highly parallelized, GPU-accelerated computer software that performs this task efficiently. Our flexible formulation employs CUDA, OpenMP, and MPI parallelization combined with both CPU and GPU computing. The resulting BioEM software scales nearly ideally both on pure CPU and on CPU+GPU architectures, thus enabling Bayesian analysis of tens of thousands of images in a reasonable time. The g...

  4. Human performance modeling for system of systems analytics :soldier fatigue.

    Energy Technology Data Exchange (ETDEWEB)

    Lawton, Craig R.; Campbell, James E.; Miller, Dwight Peter

    2005-10-01

    The military has identified Human Performance Modeling (HPM) as a significant requirement and challenge of future systems modeling and analysis initiatives as can be seen in the Department of Defense's (DoD) Defense Modeling and Simulation Office's (DMSO) Master Plan (DoD 5000.59-P 1995). To this goal, the military is currently spending millions of dollars on programs devoted to HPM in various military contexts. Examples include the Human Performance Modeling Integration (HPMI) program within the Air Force Research Laboratory, which focuses on integrating HPMs with constructive models of systems (e.g. cockpit simulations) and the Navy's Human Performance Center (HPC) established in September 2003. Nearly all of these initiatives focus on the interface between humans and a single system. This is insufficient in the era of highly complex network centric SoS. This report presents research and development in the area of HPM in a system-of-systems (SoS). Specifically, this report addresses modeling soldier fatigue and the potential impacts soldier fatigue can have on SoS performance.

  5. Volumetric models for tropical pine in pure stand in Rondônia State, Brazil Modelos volumétricos para Pinus tropicais, em povoamento homogêneo, no Estado de Rondônia

    Directory of Open Access Journals (Sweden)

    Allan Libanio Pelissari

    2011-09-01

    Full Text Available

    This study aimed to adjust volumetric models to tropical pines, in pure stand, in the municipality of Vilhena, Rondonia State.  The data came from 20 felled trees of <em>Pinus caribaeaem> var.  hondurensis and 10 <em>Pinus tecunumaniiem> trees with discs collected at fixed positions of 0.20 m, 0.70 m, 1.30 m and in distances of one meter along the stem, for later counting and measurement of the growth rings at ages from 4 to 12 years. Eight volumetric models were adjusted. The selection criteria used were: standard error of estimate, adjusted coefficient of  determination, F test, significance of regression coefficients,  mean deviation, standard deviation of the differences, sum of square of the relative residual, percentage of the residuals and graphic analysis of residuals. The models from Näslund  modified and from Spurr presented, respectively, best fit to estimate the volume for <em>Pinus caribaeaem> var. <em>hondurensis em>submitted to the first thinning and for <em>Pinus tecunumaniiem>, with  ages between 4 and 12 years, in Vilhena, Rondonia State, Brazil.

    doi: 10.4336/2011.pfb.31.67.173

    Este trabalho teve como objetivo ajustar modelos volumétricos para <em>Pinus em>tropicais, em povoamento homogêneo, no Município  de Vilhena, RO. Para a coleta de dados, foram derrubadas 20  árvores de <em>Pinus caribaeaem> var. hondurensis e 10 de <em>Pinus  tecunumaniiem>, sendo coletados discos em posições fixas de 0,20  m; 0,70 m; 1,30 m e em distâncias de um metro ao longo do  fuste, para a posterior contagem e mensuração dos anéis de crescimento nas idades de 4 a 12 anos. Foram ajustados oito modelos volumétricos e o critério de seleção considerou os  resultados do erro padrão da estimativa, coeficiente de determinação ajustado, teste F, significância dos coeficientes de regressão, desvio médio, desvio-padrão das diferenças, soma de quadrados do resíduo relativo, resíduo percentual

  6. On modeling and controlling intelligent systems

    Energy Technology Data Exchange (ETDEWEB)

    Dress, W.B.

    1993-11-01

    The aim of this paper is to show how certain diverse and advanced techniques of information processing and system theory might be integrated into a model of an intelligent, complex entity capable of materially enhancing an advanced information management system. To this end, we first examine the notion of intelligence and ask whether a semblance thereof can arise in a system consisting of ensembles of finite-state automata. Our goal is to find a functional model of intelligence in an information-management setting that can be used as a tool. The purpose of this tool is to allow us to create systems of increasing complexity and utility, eventually reaching the goal of an intelligent information management system that provides and anticipates needed data and information. We base our attempt on the ideas of general system theory where the four topics of system identification, modeling, optimization, and control provide the theoretical framework for constructing a complex system that will be capable of interacting with complex systems in the real world. These four key topics are discussed within the purview of cellular automata, neural networks, and evolutionary programming. This is a report of ongoing work, and not yet a success story of a synthetic intelligent system.

  7. On modeling and controlling intelligent systems

    Energy Technology Data Exchange (ETDEWEB)

    Dress, W.B.

    1993-11-01

    The aim of this paper is to show how certain diverse and advanced techniques of information processing and system theory might be integrated into a model of an intelligent, complex entity capable of materially enhancing an advanced information management system. To this end, we first examine the notion of intelligence and ask whether a semblance thereof can arise in a system consisting of ensembles of finite-state automata. Our goal is to find a functional model of intelligence in an information-management setting that can be used as a tool. The purpose of this tool is to allow us to create systems of increasing complexity and utility, eventually reaching the goal of an intelligent information management system that provides and anticipates needed data and information. We base our attempt on the ideas of general system theory where the four topics of system identification, modeling, optimization, and control provide the theoretical framework for constructing a complex system that will be capable of interacting with complex systems in the real world. These four key topics are discussed within the purview of cellular automata, neural networks, and evolutionary programming. This is a report of ongoing work, and not yet a success story of a synthetic intelligent system.

  8. Behavioral Reference Model for Pervasive Healthcare Systems.

    Science.gov (United States)

    Tahmasbi, Arezoo; Adabi, Sahar; Rezaee, Ali

    2016-12-01

    The emergence of mobile healthcare systems is an important outcome of application of pervasive computing concepts for medical care purposes. These systems provide the facilities and infrastructure required for automatic and ubiquitous sharing of medical information. Healthcare systems have a dynamic structure and configuration, therefore having an architecture is essential for future development of these systems. The need for increased response rate, problem limited storage, accelerated processing and etc. the tendency toward creating a new generation of healthcare system architecture highlight the need for further focus on cloud-based solutions for transfer data and data processing challenges. Integrity and reliability of healthcare systems are of critical importance, as even the slightest error may put the patients' lives in danger; therefore acquiring a behavioral model for these systems and developing the tools required to model their behaviors are of significant importance. The high-level designs may contain some flaws, therefor the system must be fully examined for different scenarios and conditions. This paper presents a software architecture for development of healthcare systems based on pervasive computing concepts, and then models the behavior of described system. A set of solutions are then proposed to improve the design's qualitative characteristics including, availability, interoperability and performance.

  9. XML Model of Planning System in Foundry

    Directory of Open Access Journals (Sweden)

    A. Stawowy

    2007-07-01

    Full Text Available Contemporary enterprises (including those manufacturing iron castings have at their disposal advanced computer resources for the management of production processes. The disadvantage of these solutions is an incoherent language for writing production planning and scheduling problems. The lack of the standard for data exchange and model description makes the work on designing, development and implementation difficult. Various dialects of XML language, among others for production planning purposes, which may change this situation have been developed for the last several years. The paper describes a PSLX language, which can be viewed first of all as an ontology and communication protocol inside and outside of the Advanced Planning and Scheduling (APS system, as well as an XML standard for production planning and scheduling. This language has been then used to develop a model of planning system in a foundry. The model consists of customer’s order model, resources model and scheduling model.

  10. Externalizing Behaviour for Analysing System Models

    DEFF Research Database (Denmark)

    Ivanova, Marieta Georgieva; Probst, Christian W.; Hansen, René Rydhof

    2013-01-01

    attackers. Therefore, many attacks are considerably easier to be performed for insiders than for outsiders. However, current models do not support explicit specification of different behaviours. Instead, behaviour is deeply embedded in the analyses supported by the models, meaning that it is a complex......, if not impossible task to change behaviours. Especially when considering social engineering or the human factor in general, the ability to use different kinds of behaviours is essential. In this work we present an approach to make the behaviour a separate component in system models, and explore how to integrate......System models have recently been introduced to model organisations and evaluate their vulnerability to threats and especially insider threats. Especially for the latter these models are very suitable, since insiders can be assumed to have more knowledge about the attacked organisation than outside...

  11. Reusing knowledge in embedded system modelling

    NARCIS (Netherlands)

    Marincic, J.; Mader, Angelika H.; Wieringa, Roelf J.; Lucas, Yan

    2013-01-01

    Model-based design is a promising technique to improve the quality of software and the efficiency of the software development process. We are investigating how to efficiently model embedded software and its environment to verify the requirements for the system controlled by the software. The softwar

  12. Complex Systems and Human Performance Modeling

    Science.gov (United States)

    2013-12-01

    constitute a cognitive architecture or decomposing the work flows and resource constraints that characterize human-system interactions, the modeler...also explored the generation of so-called “ fractal ” series from simple task network models where task times are the calculated by way of a moving

  13. Immune System Model Calibration by Genetic Algorithm

    NARCIS (Netherlands)

    Presbitero, A.; Krzhizhanovskaya, V.; Mancini, E.; Brands, R.; Sloot, P.

    2016-01-01

    We aim to develop a mathematical model of the human immune system for advanced individualized healthcare where medication plan is fine-tuned to fit a patient's conditions through monitored biochemical processes. One of the challenges is calibrating model parameters to satisfy existing experimental

  14. Test-driven modeling of embedded systems

    DEFF Research Database (Denmark)

    Munck, Allan; Madsen, Jan

    2015-01-01

    To benefit maximally from model-based systems engineering (MBSE) trustworthy high quality models are required. From the software disciplines it is known that test-driven development (TDD) can significantly increase the quality of the products. Using a test-driven approach with MBSE may have a sim...

  15. A system dynamics model for communications networks

    Science.gov (United States)

    Awcock, A. J.; King, T. E. G.

    1985-09-01

    An abstract model of a communications network in system dynamics terminology is developed as implementation of this model by a FORTRAN program package developed at RSRE is discussed. The result of this work is a high-level simulation package in which the performance of adaptive routing algorithms and other network controls may be assessed for a network of arbitrary topology.

  16. System level modelling with open source tools

    DEFF Research Database (Denmark)

    Jakobsen, Mikkel Koefoed; Madsen, Jan; Niaki, Seyed Hosein Attarzadeh;

    , called ForSyDe. ForSyDe is available under the open Source approach, which allows small and medium enterprises (SME) to get easy access to advanced modeling capabilities and tools. We give an introduction to the design methodology through the system level modeling of a simple industrial use case, and we...

  17. Probabilistic modeling of solar power systems

    Science.gov (United States)

    Safie, Fayssal M.

    1989-01-01

    The author presents a probabilistic approach based on Markov chain theory to model stand-alone photovoltaic power systems and predict their long-term service performance. The major advantage of this approach is that it allows designers and developers of these systems to analyze the system performance as well as the battery subsystem performance in the long run and determine the system design requirements that meet a specified service performance level. The methodology presented is illustrated by using data for a radio repeater system for the Boston, Massachusetts, location.

  18. Cost and Performance Model for Photovoltaic Systems

    Science.gov (United States)

    Borden, C. S.; Smith, J. H.; Davisson, M. C.; Reiter, L. J.

    1986-01-01

    Lifetime cost and performance (LCP) model assists in assessment of design options for photovoltaic systems. LCP is simulation of performance, cost, and revenue streams associated with photovoltaic power systems connected to electric-utility grid. LCP provides user with substantial flexibility in specifying technical and economic environment of application.

  19. Economic Models and Algorithms for Distributed Systems

    CERN Document Server

    Neumann, Dirk; Altmann, Jorn; Rana, Omer F

    2009-01-01

    Distributed computing models for sharing resources such as Grids, Peer-to-Peer systems, or voluntary computing are becoming increasingly popular. This book intends to discover fresh avenues of research and amendments to existing technologies, aiming at the successful deployment of commercial distributed systems

  20. Eclectic Model in the Malaysian Education System

    Science.gov (United States)

    Othman, Nooraini; Mohamad, Khairul Azmi; Ilmuwan, Yayasan

    2011-01-01

    The present work aims at analysing the adoption of eclectic model in the Malaysian education system. The analysis is specifically looked from the angle of Islam and the Muslims. Malaysia has a long history of education system developments, from pre to post independence of the country. From what was initially traditional, modernity later came to…

  1. CTBT Integrated Verification System Evaluation Model

    Energy Technology Data Exchange (ETDEWEB)

    Edenburn, M.W.; Bunting, M.L.; Payne, A.C. Jr.

    1997-10-01

    Sandia National Laboratories has developed a computer based model called IVSEM (Integrated Verification System Evaluation Model) to estimate the performance of a nuclear detonation monitoring system. The IVSEM project was initiated in June 1994, by Sandia`s Monitoring Systems and Technology Center and has been funded by the US Department of Energy`s Office of Nonproliferation and National Security (DOE/NN). IVSEM is a simple, top-level, modeling tool which estimates the performance of a Comprehensive Nuclear Test Ban Treaty (CTBT) monitoring system and can help explore the impact of various sensor system concepts and technology advancements on CTBT monitoring. One of IVSEM`s unique features is that it integrates results from the various CTBT sensor technologies (seismic, infrasound, radionuclide, and hydroacoustic) and allows the user to investigate synergy among the technologies. Specifically, IVSEM estimates the detection effectiveness (probability of detection) and location accuracy of the integrated system and of each technology subsystem individually. The model attempts to accurately estimate the monitoring system`s performance at medium interfaces (air-land, air-water) and for some evasive testing methods such as seismic decoupling. This report describes version 1.2 of IVSEM.

  2. Fem Modelling of Lumbar Vertebra System

    Directory of Open Access Journals (Sweden)

    Rimantas Kačianauskas

    2014-02-01

    Full Text Available The article presents modeling of human lumbar vertebra and it‘sdeformation analysis using finite elements method. The problemof tissue degradation is raised. Using the computer aided modelingwith SolidWorks software the models of lumbar vertebra(L1 and vertebra system L1-L4 were created. The article containssocial and medical problem analysis, description of modelingmethods and the results of deformation test for one vertebramodel and for model of 4 vertebras (L1-L4.

  3. Power electronics system modeling and simulation

    Energy Technology Data Exchange (ETDEWEB)

    Lai, Jih-Sheng

    1994-12-31

    This paper introduces control system design based softwares, SIMNON and MATLAB/SIMULINK, for power electronics system simulation. A complete power electronics system typically consists of a rectifier bridge along with its smoothing capacitor, an inverter, and a motor. The system components, featuring discrete or continuous, linear or nonlinear, are modeled in mathematical equations. Inverter control methods,such as pulse-width-modulation and hysteresis current control, are expressed in either computer algorithms or digital circuits. After describing component models and control methods, computer programs are then developed for complete systems simulation. Simulation results are mainly used for studying system performances, such as input and output current harmonics, torque ripples, and speed responses. Key computer programs and simulation results are demonstrated for educational purposes.

  4. Modelling and control of dynamic systems using gaussian process models

    CERN Document Server

    Kocijan, Juš

    2016-01-01

    This monograph opens up new horizons for engineers and researchers in academia and in industry dealing with or interested in new developments in the field of system identification and control. It emphasizes guidelines for working solutions and practical advice for their implementation rather than the theoretical background of Gaussian process (GP) models. The book demonstrates the potential of this recent development in probabilistic machine-learning methods and gives the reader an intuitive understanding of the topic. The current state of the art is treated along with possible future directions for research. Systems control design relies on mathematical models and these may be developed from measurement data. This process of system identification, when based on GP models, can play an integral part of control design in data-based control and its description as such is an essential aspect of the text. The background of GP regression is introduced first with system identification and incorporation of prior know...

  5. Chain modeling for life cycle systems engineering

    Energy Technology Data Exchange (ETDEWEB)

    Rivera, J.J. [Sandia National Lab., Albuquerque, NM (United States); Shapiro, V. [Univ. of Wisconsin, Madison, WI (United States). Spatial Automation Lab.

    1997-12-01

    Throughout Sandia`s history, products have been represented by drawings. Solid modeling systems have recently replaced drawings as the preferred means for representing product geometry. These systems are used for product visualization, engineering analysis and manufacturing planning. Unfortunately, solid modeling technology is inadequate for life cycle systems engineering, which requires maintenance of technical history, efficient management of geometric and non-geometric data, and explicit representation of engineering and manufacturing characteristics. Such information is not part of the mathematical foundation of solid modeling. The current state-of-the-art in life cycle engineering is comprised of painstakingly created special purpose tools, which often are incompatible. New research on {open_quotes}chain modeling{close_quotes} provides a method of chaining the functionality of a part to the geometric representation. Chain modeling extends classical solid modeling to include physical, manufacturing, and procedural information required for life cycle engineering. In addition, chain modeling promises to provide the missing theoretical basis for Sandia`s parent/child product realization paradigm. In chain modeling, artifacts and systems are characterized in terms of their combinatorial properties: cell complexes, chains, and their operators. This approach is firmly rooted in algebraic topology and is a natural extension of current technology. The potential benefits of this approach include explicit hierarchical and combinatorial representation of physics, geometry, functionality, test, and legacy data in a common computational framework that supports a rational decision process and partial design automation. Chain modeling will have a significant impact on design preservation, system identification, parameterization, system reliability, and design simplification.

  6. World energy projection system: Model documentation

    Energy Technology Data Exchange (ETDEWEB)

    1992-06-01

    The World Energy Project System (WEPS) is an accounting framework that incorporates projects from independently documented models and assumptions about the future energy intensity of economic activity (ratios of total energy consumption divided by gross domestic product) and about the rate of incremental energy requirements met by hydropower, geothermal, coal, and natural gas to produce projections of world energy consumption published annually by the Energy Information Administration (EIA) in the International Energy Outlook (IEO) (Figure 1). Two independently documented models presented in Figure 1, the Oil Market Simulation (OMS) model and the World Integrated Nuclear Evaluation System (WINES) provide projections of oil and nuclear power consumption published in the IEO. Output from a third independently documented model, and the International Coal Trade Model (ICTM), is not published in the IEO but is used in WEPS as a supply check on projections of world coal consumption produced by WEPS and published in the IEO. A WEPS model of natural gas production documented in this report provides the same type of implicit supply check on the WEPS projections of world natural gas consumption published in the IEO. Two additional models are included in Figure 1, the OPEC Capacity model and the Non-OPEC Oil Production model. These WEPS models provide inputs to the OMS model and are documented in this report.

  7. Criptococose disseminada em lúpus eritematoso sistêmico juvenil Disseminated cryptococcosis in juvenile systemic erythematosus lupus

    Directory of Open Access Journals (Sweden)

    Mayara de Oliveira Mafra

    2008-12-01

    Full Text Available O lúpus eritematoso sistêmico (LES é uma doença inflamatória multissistêmica, na qual as infecções são responsáveis por altos índices de morbimortalidade. Os usos de corticóide e imunossupressores contribuem para o aumento das infecções. Embora as bactérias sejam os agentes mais comuns, grande variedade de patógenos tem sido relatada. Este artigo descreve um caso de LES em um menino de 15 anos com criptococose disseminada (sistema nervoso central, pulmão e rim e encefalite tuberculosa presumível. A coexistência de infecção por Cryptococcus e LES é descrita na literatura, mas a associação desta com encefalite tuberculosa é incomum. O risco potencial de infecções em pacientes lúpicos imunossuprimidos deve alertar o médico a adotar estratégias diagnósticas e terapêuticas precoces visando ao espectro ampliado de possíveis patógenos.Systemic lupus erythematosus (SLE is a multisystem inflammatory disease, in which infection is responsible for high rates of mortality. The use of corticosteroids and immunosuppressive therapy contributes to this high incidence of infections. Although bacteria are the most common agents, a wide variety of pathogens has been reported. This article reports a case of SLE in a 15 years-old boy with disseminated criptococosis (central nervous system, lungs and kidneys and presumptive tuberculous encephalitis. The coexistence of infection by Cryptococcus and SLE is described in the literature, but the combination of this with tuberculous encephalitis is uncommon. The potential risk of infection in immunosuppressed SLE patients should alert the physician to adopt early diagnostic and therapeutic strategies aiming at an extended spectrum of pathogens.

  8. Systemic change increases model projection uncertainty

    Science.gov (United States)

    Verstegen, Judith; Karssenberg, Derek; van der Hilst, Floor; Faaij, André

    2014-05-01

    Most spatio-temporal models are based on the assumption that the relationship between system state change and its explanatory processes is stationary. This means that model structure and parameterization are usually kept constant over time, ignoring potential systemic changes in this relationship resulting from e.g., climatic or societal changes, thereby overlooking a source of uncertainty. We define systemic change as a change in the system indicated by a system state change that cannot be simulated using a constant model structure. We have developed a method to detect systemic change, using a Bayesian data assimilation technique, the particle filter. The particle filter was used to update the prior knowledge about the model structure. In contrast to the traditional particle filter approach (e.g., Verstegen et al., 2014), we apply the filter separately for each point in time for which observations are available, obtaining the optimal model structure for each of the time periods in between. This allows us to create a time series of the evolution of the model structure. The Runs test (Wald and Wolfowitz, 1940), a stationarity test, is used to check whether variation in this time series can be attributed to randomness or not. If not, this indicates systemic change. The uncertainty that the systemic change adds to the existing model projection uncertainty can be determined by comparing model outcomes of a model with a stationary model structure and a model with a model structure changing according to the variation found in the time series. To test the systemic change detection methodology, we apply it to a land use change cellular automaton (CA) (Verstegen et al., 2012) and use observations of real land use from all years from 2004 to 2012 and associated uncertainty as observational data in the particle filter. A systemic change was detected for the period 2006 to 2008. In this period the influence on the location of sugar cane expansion of the driver sugar cane in

  9. Information systems validation using formal models

    Directory of Open Access Journals (Sweden)

    Azadeh Sarram

    2014-03-01

    Full Text Available During the past few years, there has been growing interest to use unified modeling language (UML to consider the functional requirements. However, lacking a tool to detect the accuracy and the logic of diagrams in this language makes a formal model indispensable. In this study, conversion of primary UML model of a system to a colored Petri net has been accomplished in order to examine the precision of the model. For this purpose, first the definition of priority and implementation tags for UML activity diagram are provided; then it is turned into colored Petri net. Second, the proposed model provides translated tags in terms of net transitions and some monitoring are used to control the system characteristics. Finally, an executable model of UML activity diagram is provided so that the designer could simulate the model by using the simulation results to detect and to refine the problems of the model. In addition, by checking the results, we find out the proposed method enhances authenticity and accuracy of early models and the ratio of system validation increases compared with previous methods.

  10. Security Communication Model of Wireless Trade System

    Institute of Scientific and Technical Information of China (English)

    ZHANG Wen-kai; ZHANG Si-yu

    2005-01-01

    This paper proposes a C/S system model for K Java and PDA named Net-Wireless. It is a discussion and proposal on information security and solutions for K-Java handsets and PDAs in wireless network. It also explains the scheme which between client security module and server security module. Also, We have developed a Security Server and a K-Java encryption module for e-commerce system and other trade systems.

  11. Expert System Model for Educational Personnel Selection

    Directory of Open Access Journals (Sweden)

    Héctor A. Tabares-Ospina

    2013-06-01

    Full Text Available The staff selection is a difficult task due to the subjectivity that the evaluation means. This process can be complemented using a system to support decision. This paper presents the implementation of an expert system to systematize the selection process of professors. The management of software development is divided into 4 parts: requirements, design, implementation and commissioning. The proposed system models a specific knowledge through relationships between variables evidence and objective.

  12. Acidentes em postos e sistemas retalhistas de combustíveis: subsídios para a vigilância em saúde ambiental Environmental accidents in gas stations and retailling systems

    Directory of Open Access Journals (Sweden)

    Jorge Luiz Nobre Gouveia

    2007-09-01

    Full Text Available Os acidentes em postos e sistemas retalhistas resultam de forma imediata em danos graves à vida de pessoas, na contaminação do solo e da água. O objetivo deste trabalho foi discutir a importância da atuação conjunta dos órgãos ambientais e de saúde e subsidiar a estruturação do Sistema Nacional de Vigilância em Saúde Ambiental. A metodologia consistiu no estudo da literatura nacional e internacional; levantamento dos dados existentes em oito órgãos ambientais estaduais brasileiros sobre atendimentos emergenciais e análise de um caso ocorrido no município de Guarulhos, Estado de São Paulo, em janeiro de 2005. Os resultados revelaram que esses acidentes são importante causa de acidentes ambientais e há grande diferença na atuação dos diversos órgãos ambientais. Também demonstra que a estruturação da vigilância em saúde ambiental deve abordar a interface com outras instituições públicas envolvidas.The accidents in gas stations and retailing systems result in grave damages to the life of people and contamination of the soil and water. The objective is to discuss the importance of the joint action of environmental and health organs and to subsidize the structuring of the National System of Surveillance in Environmental Health. The methodology consisted of the studying of the national and international literature; to compile the existent data on eight environmental organs about accidents, and analysis of one case occurred in Guarulhos, State of São Paulo, in January, 2005. The results revealed that these accidents are an important cause of environmental accidents and that there is a great difference in the actions of the diverse environmental organs and demonstrates that the structure of surveillance in environmental health should consider the interface with other public institutions.

  13. Model Based Control of Refrigeration Systems

    DEFF Research Database (Denmark)

    Larsen, Lars Finn Sloth

    of the supermarket refrigeration systems therefore greatly relies on a human operator to detect and accommodate failures, and to optimize system performance under varying operational condition. Today these functions are maintained by monitoring centres located all over the world. Initiated by the growing need...... for automation of these procedures, that is to incorporate some "intelligence" in the control system, this project was started up. The main emphasis of this work has been on model based methods for system optimizing control in supermarket refrigeration systems. The idea of implementing a system optimizing.......e. by degrading the performance. The method has been successfully applied on a test frigeration system for minimization of the power consumption; the hereby gained experimental results will be presented. The present control structure in a supermarket refrigeration system is distributed, which means...

  14. Business Models for Power System Flexibility

    DEFF Research Database (Denmark)

    Boscan, Luis; Poudineh, Rahmatallah

    2016-01-01

    -enabling business models, adding new activities to the existing supply chain. Ranging from technological to market-based innovation, this chapter reviews the latest developments in these emerging models. The main conclusion is that when flexibility becomes scarce in the system, new players with their innovative......As intermittent, renewable resources gain more share in the generation mix, the need for power system flexibility increases more than ever. Parallel to this, technological change and the emergence of new players bringing about innovative solutions are boosting the development of flexibility...... business models will play an important role in ensuring sufficiency and efficiency of flexibility services....

  15. Application of RBAC Model in System Kernel

    Directory of Open Access Journals (Sweden)

    Guan Keqing

    2012-11-01

    Full Text Available In the process of development of some technologies about Ubiquitous computing, the application of embedded intelligent devices is booming. Meanwhile, information security will face more serious threats than before. To improve the security of information terminal’s operation system, this paper analyzed the threats to system’s information security which comes from the abnormal operation by processes, and applied RBAC model into the safety management mechanism of operation system’s kernel. We built an access control model of system’s process, and proposed an implement framework. And the methods of implementation of the model for operation systems were illustrated.

  16. OFFl Models: Novel Schema for Dynamical Modeling of Biological Systems.

    Science.gov (United States)

    Ogbunugafor, C Brandon; Robinson, Sean P

    2016-01-01

    Flow diagrams are a common tool used to help build and interpret models of dynamical systems, often in biological contexts such as consumer-resource models and similar compartmental models. Typically, their usage is intuitive and informal. Here, we present a formalized version of flow diagrams as a kind of weighted directed graph which follow a strict grammar, which translate into a system of ordinary differential equations (ODEs) by a single unambiguous rule, and which have an equivalent representation as a relational database. (We abbreviate this schema of "ODEs and formalized flow diagrams" as OFFL.) Drawing a diagram within this strict grammar encourages a mental discipline on the part of the modeler in which all dynamical processes of a system are thought of as interactions between dynamical species that draw parcels from one or more source species and deposit them into target species according to a set of transformation rules. From these rules, the net rate of change for each species can be derived. The modeling schema can therefore be understood as both an epistemic and practical heuristic for modeling, serving both as an organizational framework for the model building process and as a mechanism for deriving ODEs. All steps of the schema beyond the initial scientific (intuitive, creative) abstraction of natural observations into model variables are algorithmic and easily carried out by a computer, thus enabling the future development of a dedicated software implementation. Such tools would empower the modeler to consider significantly more complex models than practical limitations might have otherwise proscribed, since the modeling framework itself manages that complexity on the modeler's behalf. In this report, we describe the chief motivations for OFFL, carefully outline its implementation, and utilize a range of classic examples from ecology and epidemiology to showcase its features.

  17. OFFl Models: Novel Schema for Dynamical Modeling of Biological Systems.

    Directory of Open Access Journals (Sweden)

    C Brandon Ogbunugafor

    Full Text Available Flow diagrams are a common tool used to help build and interpret models of dynamical systems, often in biological contexts such as consumer-resource models and similar compartmental models. Typically, their usage is intuitive and informal. Here, we present a formalized version of flow diagrams as a kind of weighted directed graph which follow a strict grammar, which translate into a system of ordinary differential equations (ODEs by a single unambiguous rule, and which have an equivalent representation as a relational database. (We abbreviate this schema of "ODEs and formalized flow diagrams" as OFFL. Drawing a diagram within this strict grammar encourages a mental discipline on the part of the modeler in which all dynamical processes of a system are thought of as interactions between dynamical species that draw parcels from one or more source species and deposit them into target species according to a set of transformation rules. From these rules, the net rate of change for each species can be derived. The modeling schema can therefore be understood as both an epistemic and practical heuristic for modeling, serving both as an organizational framework for the model building process and as a mechanism for deriving ODEs. All steps of the schema beyond the initial scientific (intuitive, creative abstraction of natural observations into model variables are algorithmic and easily carried out by a computer, thus enabling the future development of a dedicated software implementation. Such tools would empower the modeler to consider significantly more complex models than practical limitations might have otherwise proscribed, since the modeling framework itself manages that complexity on the modeler's behalf. In this report, we describe the chief motivations for OFFL, carefully outline its implementation, and utilize a range of classic examples from ecology and epidemiology to showcase its features.

  18. Experimental model of pulmonary carcinogenesis in Wistar rats Modelo experimental de carcinogênese pulmonar em ratos Wistar

    Directory of Open Access Journals (Sweden)

    Baldomero Antonio Kato da Silva

    2007-01-01

    Full Text Available PURPOSE: To elaborate an experimental model of pulmonary carcinogenesis in Wistar rats. METHODS: Male Rattus norvegicus albinus, Wistar lineage was carried through an intra-pulmonary instillation of the Benzo[a]pyrene (B[a]P dilution in alcohol 70%, a polycyclic aromatic hydrocarbon widely known by its power of tumoral induction. Three experimental groups had been formed with 08 animals each: Control Group (Alcohol 70%; B[a]P Group 10 mg/kg; e B[a]P Group 20mg/kg, submitted to euthanasia 08, 10, 12 and 14 weeks after the experimental procedure. The pulmonary sections had been colored by hematoxilin-eosin (HE and submitted to the morphometrical analysis to describe the tissue alterations. RESULTS: The presence of diffuse inflammatory alterations was observed in all groups, however, at the analysis of the pulmonary tissue of the experimental groups, it had been observed hyperplasic alterations (BALT hyperplasia, and in one of the animals of the experimental group 20mg/kg (12 weeks, it was noticed the presence of cellular epithelial tracheal pleomorphism, suggesting the adenocarcinoma formation in situ. CONCLUSION: The main secondary alterations to the intra-pulmonary instillation of B[a]P in Wistar rats were: cellular proliferation, inflammatory alterations of several degrees and nodular lymphoid hyperplasias. The association of an activator agent of the pulmonary metabolic reply is necessary to establish the ideal reply-dose to the development of the lung cancer.OBJETIVO: Elaborar um modelo experimental de carcinogênese pulmonar em ratos wistar. MÉTODOS: Rattus norvegicus albinus, linhagem Wistar foram submetidos a instilação intra-pulmonar da diluição em álcool 70% de Benzo[a]pireno (B[a]P, um hidrocarboneto aromático policíclico amplamente conhecido por seu poder de indução tumoral. Foram formados três grupos experimentais com 08 animais cada: Grupo Controle (álcool 70%; Grupo B[a]P 10 mg/kg; e Grupo B[a]P 20mg/kg, submetidos a

  19. Modeling the heart and the circulatory system

    CERN Document Server

    2015-01-01

    The book comprises contributions by some of the most respected scientists in the field of mathematical modeling and numerical simulation of the human cardiocirculatory system. The contributions cover a wide range of topics, from the preprocessing of clinical data to the development of mathematical equations, their numerical solution, and both in-vivo and in-vitro validation. They discuss the flow in the systemic arterial tree and the complex electro-fluid-mechanical coupling in the human heart. Many examples of patient-specific simulations are presented. This book is addressed to all scientists interested in the mathematical modeling and numerical simulation of the human cardiocirculatory system.

  20. Modeling and simulation of discrete event systems

    CERN Document Server

    Choi, Byoung Kyu

    2013-01-01

    Computer modeling and simulation (M&S) allows engineers to study and analyze complex systems. Discrete-event system (DES)-M&S is used in modern management, industrial engineering, computer science, and the military. As computer speeds and memory capacity increase, so DES-M&S tools become more powerful and more widely used in solving real-life problems. Based on over 20 years of evolution within a classroom environment, as well as on decades-long experience in developing simulation-based solutions for high-tech industries, Modeling and Simulation of Discrete-Event Systems is the only book on