Diagnósticos de Enfermagem identificados em gestantes durante o pré-natal Diagnósticos de Enfermería identificados en embarazos durante el prenatal Nursing Diagnoses identified in pregnant patients under prenatal care

Directory of Open Access Journals (Sweden)

Sandra Valéria Martins Pereira

2005-12-01

Full Text Available Esta pesquisa descritiva objetivou analisar o perfil de Diagnósticos de Enfermagem identificados em gestantes de baixo-risco. Participaram onze gestantes atendidas no pré-natal de uma maternidade segura no estado de Goiás. Os dados foram classificados segundo a taxonomia II da North American Nursing Diagnosis Association (NANDA e analisados à luz de referenciais da obstetrícia. Foram identificados 25 diferentes Diagnósticos de Enfermagem. Todas as gestantes apresentaram: Conhecimento deficiente (diferentes graus e assuntos, Padrão de sono perturbado, Intolerância à atividade percebida, Déficit do autocuidado (banho e higiene, Incontinência urinária por pressão e alguns diagnósticos de risco. Identificar Diagnóstico de Enfermagem da NANDA permite a determinação do grau de risco gestacional, detecção precoce de complicações e individualização da assistência de enfermagem.Este estudio descriptivo pretende analizar el perfil de Diagnósticos de Enfermería identificados en embarazos de bajo riesgo. Participaron once embarazadas atendidas en el prenatal de una maternidad confiable en el estado de Goiás. Los datos fueron clasificados según la taxonomía II de la North American Nursing Diagnosis Association (NANDA/Asociación Norteamericana de Diagnósticos de Enfermería y analizados bajo los referenciales de la obstetricia. Fueron identificados 25 diferentes Diagnósticos de Enfermería. Todas las embarazadas presentaron: Conocimiento insuficiente (diferentes grados y asuntos, Patrón de sueño alterado, Intolerancia a la actividad percibida, falta de auto-higiene (baño e higiene personal, Incontinencia urinaria por presión y algunos diagnósticos de riesgo. Identificar Diagnóstico de Enfermería de NANDA permite la determinación del grado de riego, detección precoz de complicaciones e individualización de la asistencia de enfermería.This descriptive research aimed to analyze the Nursing Diagnoses identified in low

Dificuldades no diagnóstico da pneumonia associada ao ventilador

Directory of Open Access Journals (Sweden)

Maria Augusta Machado

2003-11-01

Full Text Available RESUMO: A pneumonia associada ao ventilador é uma doença que apresenta elevada morbilidade e mortalidade. Por isso é importante um diagnóstico correcto, de modo a orientar a antibioterapia da forma mais adequada. No entanto, o seu diagnóstico é difícil, pois o quadro clínico e radiológico são inespecíficos, e critérios de diagnóstico estandardizados, que permitem a sua confirmação, são muito invasivos ou pouco frequentes. O desenvolvimento de técnicas de colheita com protecção das amostras e de culturas quantitativas tem tentado contornar o problema da contaminação das amostras obtidas por métodos de rotina e permitir a distinção entre colonização e infecção. A autora faz uma revisão sobre os diferentes métodos de diagnóstico desta entidade clínica.REV PORT PNEUMOL 2003; IX (6: 503-514 ABSTRACT: Ventilator associated pneumonia is associated with high morbidity and mortality. It is important a correct diagnosis in way to guide the antibiotic therapy in the most appropriate way. However, its diagnosis is difficult, because clinical and radiologic features are not specific and approaches to standard diagnosis, that allow its confirmation, are very invasive or not very frequent. Protected techniques and quantitative cultures have been trying to outline the problem of the contamination of the samples obtained by routine methods and to allow the distinction between colonization and infection. The author makes a revision on the different methods of diagnosis of this clinical entity.REV PORT PNEUMOL 2003; IX (6: 503-514 Palavras-chave: Pneumonia, ventilação mecânica, diagnóstico, Key-words: Pneumonia, mechanical ventilation, diagnosis

Diretrizes da Associação Médica Brasileira para o diagnóstico e diagnóstico diferencial do transtorno de ansiedade social Guidelines of the Brazilian Medical Association for the diagnosis and differential diagnosis of social anxiety disorder

Directory of Open Access Journals (Sweden)

Marcos Hortes N. Chagas

2010-12-01

Full Text Available OBJETIVO: O transtorno de ansiedade social é o transtorno de ansiedade mais comum, apresenta curso crônico, frequentemente sem remissões, sendo comumente associado com importante prejuízo funcional e comprometimento psicossocial. A Associação Médica Brasileira, por meio do projeto "Diretrizes", busca desenvolver consensos de diagnóstico e tratamento para as doenças mais comuns. O objetivo deste trabalho é apresentar os achados mais relevantes das diretrizes da Associação Médica Brasileira relativas ao diagnóstico e diagnóstico diferencial do transtorno de ansiedade social. MÉTODO: O método utilizado foi o proposto pela Associação Médica Brasileira para o projeto Diretrizes. A busca foi realizada nas bases de dados do Medline (PubMed, Scopus, Web of Science e Lilacs, sem limite de tempo. A estratégia utilizada baseou-se em perguntas estruturadas na forma P.I.C.O. (acrônimo das iniciais "paciente ou população"; "intervenção, indicador ou exposição"; "controle ou comparação" e; "outcome ou desfecho". RESULTADOS: São apresentados dados relativos a manifestações clínicas, prejuízos e implicações, diferenças entre os subtipos generalizado e circunscrito, e impacto com depressão, abuso e dependência de drogas e outros transtornos de ansiedade. Além disso, foram realizadas discussões acerca dos principais diagnósticos diferenciais. CONCLUSÃO: As diretrizes propõem-se a servir de referência para o médico generalista e especialista, auxiliando e facilitando o diagnóstico do transtorno de ansiedade social.OBJECTIVE: Social anxiety disorder is the most common anxiety disorder. The condition has a chronic course usually with no remission and is frequently associated with significant functional and psychosocial impairment. The Brazilian Medical Association, with the project named Diretrizes ('Guidelines', in English, endeavors to develop diagnostic and treatment protocols for the most common disorders. This work

Local time asymmetry of Pc 4--5 pulsations and associated particle modulations at synchronous orbit

International Nuclear Information System (INIS)

Kokubun, S.; Erickson, K.N.; Fritz, T.A.; McPherron, R.L.

1989-01-01

Magnetic field and particle flux observations on board ATS 6 at synchronous altitude are used to examine the dawn-dusk asymmetry of characteristics of Pc 4--5 waves and associated particle flux modulation. Most waves at synchronous orbit having ground correlations are polarized in the azimuthal direction (A class) and are usually detected in the dawn sector. Waves with a radially oriented polarization ellipse (R-class) are almost never observed near the subsatellite point on the ground, except for the regular pulsations known as giant pulsation Pg, observed in the early morning. R class Pc 4 waves occur at all local times and have an occurrence peak in the afternoon

A chimeric path to neuronal synchronization

Science.gov (United States)

Essaki Arumugam, Easwara Moorthy; Spano, Mark L.

2015-01-01

Synchronization of neuronal activity is associated with neurological disorders such as epilepsy. This process of neuronal synchronization is not fully understood. To further our understanding, we have experimentally studied the progression of this synchronization from normal neuronal firing to full synchronization. We implemented nine FitzHugh-Nagumo neurons (a simplified Hodgkin-Huxley model) via discrete electronics. For different coupling parameters (synaptic strengths), the neurons in the ring were either unsynchronized or completely synchronized when locally coupled in a ring. When a single long-range connection (nonlocal coupling) was introduced, an intermediate state known as a chimera appeared. The results indicate that (1) epilepsy is likely not only a dynamical disease but also a topological disease, strongly tied to the connectivity of the underlying network of neurons, and (2) the synchronization process in epilepsy may not be an "all or none" phenomenon, but can pass through an intermediate stage (chimera).

A chimeric path to neuronal synchronization

Energy Technology Data Exchange (ETDEWEB)

Essaki Arumugam, Easwara Moorthy; Spano, Mark L. [School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287-9709 (United States)

2015-01-15

Synchronization of neuronal activity is associated with neurological disorders such as epilepsy. This process of neuronal synchronization is not fully understood. To further our understanding, we have experimentally studied the progression of this synchronization from normal neuronal firing to full synchronization. We implemented nine FitzHugh-Nagumo neurons (a simplified Hodgkin-Huxley model) via discrete electronics. For different coupling parameters (synaptic strengths), the neurons in the ring were either unsynchronized or completely synchronized when locally coupled in a ring. When a single long-range connection (nonlocal coupling) was introduced, an intermediate state known as a chimera appeared. The results indicate that (1) epilepsy is likely not only a dynamical disease but also a topological disease, strongly tied to the connectivity of the underlying network of neurons, and (2) the synchronization process in epilepsy may not be an “all or none” phenomenon, but can pass through an intermediate stage (chimera)

A chimeric path to neuronal synchronization

International Nuclear Information System (INIS)

Essaki Arumugam, Easwara Moorthy; Spano, Mark L.

2015-01-01

Synchronization of neuronal activity is associated with neurological disorders such as epilepsy. This process of neuronal synchronization is not fully understood. To further our understanding, we have experimentally studied the progression of this synchronization from normal neuronal firing to full synchronization. We implemented nine FitzHugh-Nagumo neurons (a simplified Hodgkin-Huxley model) via discrete electronics. For different coupling parameters (synaptic strengths), the neurons in the ring were either unsynchronized or completely synchronized when locally coupled in a ring. When a single long-range connection (nonlocal coupling) was introduced, an intermediate state known as a chimera appeared. The results indicate that (1) epilepsy is likely not only a dynamical disease but also a topological disease, strongly tied to the connectivity of the underlying network of neurons, and (2) the synchronization process in epilepsy may not be an “all or none” phenomenon, but can pass through an intermediate stage (chimera)

Pilotless Frame Synchronization Using LDPC Code Constraints

Science.gov (United States)

Jones, Christopher; Vissasenor, John

2009-01-01

A method of pilotless frame synchronization has been devised for low- density parity-check (LDPC) codes. In pilotless frame synchronization , there are no pilot symbols; instead, the offset is estimated by ex ploiting selected aspects of the structure of the code. The advantag e of pilotless frame synchronization is that the bandwidth of the sig nal is reduced by an amount associated with elimination of the pilot symbols. The disadvantage is an increase in the amount of receiver data processing needed for frame synchronization.

Synchronization and anti-synchronization coexist in Chen-Lee chaotic systems

International Nuclear Information System (INIS)

Chen, J.-H.; Chen, H.-K.; Lin, Y.-K.

2009-01-01

This study demonstrates that synchronization and anti-synchronization can coexist in Chen-Lee chaotic systems by direct linear coupling. Based on Lyapunov's direct method, a linear controller was designed to assure that two different types of synchronization can simultaneously be achieved. Further, the hybrid projective synchronization of Chen-Lee chaotic systems was studied using a nonlinear control scheme. The nonlinear controller was designed according to the Lyapunov stability theory to guarantee the hybrid projective synchronization, including synchronization, anti-synchronization, and projective synchronization. Finally, numerical examples are presented in order to illustrate the proposed synchronization approach.

El diagnóstico positivo de autismo infantil

OpenAIRE

Velázquez Argota, Juana; Lozano Pérez, Teresa

1996-01-01

Se revisan los límites del síndrome autístico y la evolución del concepto de autismo infantil desde Kanner hasta las clasificaciones psiquiátricas más recientes. Se informan los resultados de nuestras investigaciones en el diagnóstico positivo del autismo infantil. La anamnesis remota es de poco valor, más relevantes para el diagnóstico constituyen el examen del paciente en el presente y las escalas de cuantificación del autismo (las cuales son de utilidad en el diagnóstico diferencial entre ...

Langevin approach to synchronization of hyperchaotic time-delay dynamics

Energy Technology Data Exchange (ETDEWEB)

Budini, Adrian A [Consejo Nacional de Investigaciones CientIficas y Tecnicas, Centro Atomico Bariloche, Av. E Bustillo Km 9.5, (8400) Bariloche (Argentina); Consortium of the Americas for Interdisciplinary Science and Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States)

2008-11-07

In this paper, we characterize the synchronization phenomenon of hyperchaotic scalar nonlinear delay dynamics in a fully-developed chaos regime. Our results rely on the observation that, in that regime, the stationary statistical properties of a class of hyperchaotic attractors can be reproduced with a linear Langevin equation, defined by replacing the nonlinear delay force by a delta-correlated noise. Therefore, the synchronization phenomenon can be analytically characterized by a set of coupled Langevin equations. We apply this formalism to study anticipated synchronization dynamics subject to external noise fluctuations as well as for characterizing the effects of parameter mismatch in a hyperchaotic communication scheme. The same procedure is applied to second-order differential delay equations associated with synchronization in electro-optical devices. In all cases, the departure with respect to perfect synchronization is measured through a similarity function. Numerical simulations in discrete maps associated with the hyperchaotic dynamics support the formalism.

Diagnóstico do embolismo pulmonar

OpenAIRE

Castaño, João; Alpendre, João; Pisco, João Martins

2003-01-01

RESUMO: O diagnóstico do Embolismo Pulmonar é considerado por vezes difícil. É importante reconhecer as situações clínicas que podem ser potencialmente desencadeantes. Existe uma série de meios auxiliares de diagnóstico, quer laboratoriais quer imagiológicos, que devem ser adaptados aos meios disponíveis em cada instituição.REV PORT PNEUMOL 2003; IX (2): 129-137 ABSTRACT: Pulmonary Embolism is often considered a difficult diagnosis to establish. It is important to recognise clinical situation...

Synchronization of metronomes

Science.gov (United States)

Pantaleone, James

2002-10-01

Synchronization is a common phenomenon in physical and biological systems. We examine the synchronization of two (and more) metronomes placed on a freely moving base. The small motion of the base couples the pendulums causing synchronization. The synchronization is generally in-phase, with antiphase synchronization occurring only under special conditions. The metronome system provides a mechanical realization of the popular Kuramoto model for synchronization of biological oscillators, and is excellent for classroom demonstrations and an undergraduate physics lab.

Remote synchronization reveals network symmetries and functional modules.

Science.gov (United States)

Nicosia, Vincenzo; Valencia, Miguel; Chavez, Mario; Díaz-Guilera, Albert; Latora, Vito

2013-04-26

We study a Kuramoto model in which the oscillators are associated with the nodes of a complex network and the interactions include a phase frustration, thus preventing full synchronization. The system organizes into a regime of remote synchronization where pairs of nodes with the same network symmetry are fully synchronized, despite their distance on the graph. We provide analytical arguments to explain this result, and we show how the frustration parameter affects the distribution of phases. An application to brain networks suggests that anatomical symmetry plays a role in neural synchronization by determining correlated functional modules across distant locations.

Diagnóstico de enfermagem um desafio de enfermagem para os anos 90

Directory of Open Access Journals (Sweden)

Vera Lúcia de Almeida Bezerra Perez

1990-12-01

Full Text Available Os autores deste trabalho apresentam um relato histórico do desenvolvimento dos diagnósticos de enfermagem, incluindo definições e Sistemas de Classificação. É discutida a evolução a partir de uma lista alfabética de nomes de diagnósticos para os Padrões de Respostas Humanas da NANDA (North American Nursing Diagnosis Association. O desafio surge da necessidade de participação internacional na validação, notificação e conseqüente estabelecimento da Taxonomia para a aceitação no CID-10 (Código Internacional de Doenças.

Sobre el diagnóstico de bipolaridad

OpenAIRE

Dr. A. Alejandro Koppmann

2012-01-01

Dado el aumento en el diagnostico de bipolaridad, las dificultades de establecer límites entre el ánimo normal y patológico y los riesgos derivados de la indicación de tratamientos inadecuados, se presentan aquí antecedentes relativos a la historia y diagnóstico del Trastorno Bipolar así como las principales clasificaciones vigentes y las áreas de conflicto en cuanto a diagnóstico diferencial.

Sobre el diagnóstico de bipolaridad

Directory of Open Access Journals (Sweden)

Dr. A. Alejandro Koppmann

2012-09-01

Full Text Available Dado el aumento en el diagnostico de bipolaridad, las dificultades de establecer límites entre el ánimo normal y patológico y los riesgos derivados de la indicación de tratamientos inadecuados, se presentan aquí antecedentes relativos a la historia y diagnóstico del Trastorno Bipolar así como las principales clasificaciones vigentes y las áreas de conflicto en cuanto a diagnóstico diferencial.

Zero-lag synchronization and bubbling in delay-coupled lasers.

Science.gov (United States)

Tiana-Alsina, J; Hicke, K; Porte, X; Soriano, M C; Torrent, M C; Garcia-Ojalvo, J; Fischer, I

2012-02-01

We show experimentally that two semiconductor lasers mutually coupled via a passive relay fiber loop exhibit chaos synchronization at zero lag, and study how this synchronized regime is lost as the lasers' pump currents are increased. We characterize the synchronization properties of the system with high temporal resolution in two different chaotic regimes, namely, low-frequency fluctuations and coherence collapse, identifying significant differences between them. In particular, a marked decrease in synchronization quality develops as the lasers enter the coherence collapse regime. Our high-resolution measurements allow us to establish that synchronization loss is associated with bubbling events, the frequency of which increases with increasing pump current.

Bilateral synchronous benign ovarian neoplasm: A rare occurrence ...

African Journals Online (AJOL)

Bilateral synchronous ovarian tumours are defined as the occurrence of two or more histologically distinct tumours in the ovaries. Synchronous tumours of the female genital tract are rare and the association of mature cystic teratoma with contralateral serous cystadenoma is uncommon. We report the rare occurrence of a ...

La saliva como medio de diagnóstico de VIH

Directory of Open Access Journals (Sweden)

Ricardo Medina Madrid

2000-12-01

Full Text Available La saliva como medio diagnóstico permite reconocer las concentraciones de una serie de componentes tanto endógenos como exógenos presentes en el organismo. Gracias a los anticuerpos presentes en la saliva se pueden aplicar las nuevas tecnologías biomédicas en el diagnóstico del síndrome de inmunodeficiencia humana causado por el VIH. Este novedoso método posee numerosas ventajas con respecto a las pruebas en sangre. Se plantea información sobre los fluidos bucales, los diversos componentes con posibilidad de diagnóstico presentes en la saliva y se establecen las características de un método diagnóstico (Omni-Sal® aplicado a personas que padecen de alguna enfermedad del complejo bucal. Descriptores

Partial synchronization and spontaneous spatial ordering in coupled chaotic systems

International Nuclear Information System (INIS)

Ying Zhang; Gang Hu; Cerdeira, Hilda A.; Shigang Chen; Braun, Thomas; Yugui Yao

2000-11-01

A model of many symmetrically and locally coupled chaotic oscillators is studied. Partial chaotic synchronizations associated with spontaneous spatial ordering are demonstrated. Very rich patterns of the system are revealed, based on partial synchronization analysis. The stabilities of different partially synchronous spatiotemporal structures and some novel dynamical behaviors of these states are discussed both numerically and analytically. (author)

Mittag-Leffler synchronization of delayed fractional-order bidirectional associative memory neural networks with discontinuous activations: state feedback control and impulsive control schemes.

Science.gov (United States)

Ding, Xiaoshuai; Cao, Jinde; Zhao, Xuan; Alsaadi, Fuad E

2017-08-01

This paper is concerned with the drive-response synchronization for a class of fractional-order bidirectional associative memory neural networks with time delays, as well as in the presence of discontinuous activation functions. The global existence of solution under the framework of Filippov for such networks is firstly obtained based on the fixed-point theorem for condensing map. Then the state feedback and impulsive controllers are, respectively, designed to ensure the Mittag-Leffler synchronization of these neural networks and two new synchronization criteria are obtained, which are expressed in terms of a fractional comparison principle and Razumikhin techniques. Numerical simulations are presented to validate the proposed methodologies.

Eugenesia y diagnóstico prenatal

OpenAIRE

González Salvat, Rosa María; González Labrador, Ignacio

2002-01-01

El uso del diagnóstico prenatal en la práctica de la genética médica ha hecho que se recuerden teorías eugenésicas. Se realizó una revisión histórica de este término y se relacionó con el uso del diagnóstico prenatal (DPN) y el aborto selectivo a la luz de los conocimientos bioéticos actuales. The use of the prenatal diagnosis in the practice of medical genetics has led us to remember eugenic theories. A historical review of this term was made and it was connected with the use of prenatal ...

Overview of Cell Synchronization.

Science.gov (United States)

Banfalvi, Gaspar

2017-01-01

The widespread interest in cell synchronization is maintained by the studies of control mechanism involved in cell cycle regulation. During the synchronization distinct subpopulations of cells are obtained representing different stages of the cell cycle. These subpopulations are then used to study regulatory mechanisms of the cycle at the level of macromolecular biosynthesis (DNA synthesis, gene expression, protein synthesis), protein phosphorylation, development of new drugs, etc. Although several synchronization methods have been described, it is of general interest that scientists get a compilation and an updated view of these synchronization techniques. This introductory chapter summarizes: (1) the basic concepts and principal criteria of cell cycle synchronizations, (2) the most frequently used synchronization methods, such as physical fractionation (flow cytometry, dielectrophoresis, cytofluorometric purification), chemical blockade, (3) synchronization of embryonic cells, (4) synchronization at low temperature, (5) comparison of cell synchrony techniques, (6) synchronization of unicellular organisms, and (7) the effect of synchronization on transfection.

Symbol Synchronization for Diffusion-Based Molecular Communications.

Science.gov (United States)

Jamali, Vahid; Ahmadzadeh, Arman; Schober, Robert

2017-12-01

Symbol synchronization refers to the estimation of the start of a symbol interval and is needed for reliable detection. In this paper, we develop several symbol synchronization schemes for molecular communication (MC) systems where we consider some practical challenges, which have not been addressed in the literature yet. In particular, we take into account that in MC systems, the transmitter may not be equipped with an internal clock and may not be able to emit molecules with a fixed release frequency. Such restrictions hold for practical nanotransmitters, e.g., modified cells, where the lengths of the symbol intervals may vary due to the inherent randomness in the availability of food and energy for molecule generation, the process for molecule production, and the release process. To address this issue, we develop two synchronization-detection frameworks which both employ two types of molecule. In the first framework, one type of molecule is used for symbol synchronization and the other one is used for data detection, whereas in the second framework, both types of molecule are used for joint symbol synchronization and data detection. For both frameworks, we first derive the optimal maximum likelihood (ML) symbol synchronization schemes as performance upper bounds. Since ML synchronization entails high complexity, for each framework, we also propose three low-complexity suboptimal schemes, namely a linear filter-based scheme, a peak observation-based scheme, and a threshold-trigger scheme, which are suitable for MC systems with limited computational capabilities. Furthermore, we study the relative complexity and the constraints associated with the proposed schemes and the impact of the insertion and deletion errors that arise due to imperfect synchronization. Our simulation results reveal the effectiveness of the proposed synchronization schemes and suggest that the end-to-end performance of MC systems significantly depends on the accuracy of the symbol

Randomized, controlled trial comparing synchronized intermittent mandatory ventilation and synchronized intermittent mandatory ventilation plus pressure support in preterm infants.

Science.gov (United States)

Reyes, Zenaida C; Claure, Nelson; Tauscher, Markus K; D'Ugard, Carmen; Vanbuskirk, Silvia; Bancalari, Eduardo

2006-10-01

Prolonged mechanical ventilation is associated with lung injury in preterm infants. In these infants, weaning from synchronized intermittent mandatory ventilation may be delayed by their inability to cope with increased respiratory loads. The addition of pressure support to synchronized intermittent mandatory ventilation can offset these loads and may facilitate weaning. The purpose of this work was to compare synchronized intermittent mandatory ventilation and synchronized intermittent mandatory ventilation plus pressure support in weaning from mechanical ventilation and the duration of supplemental oxygen dependency in preterm infants with respiratory failure. Preterm infants weighing 500 to 1000 g at birth who required mechanical ventilation during the first postnatal week were randomly assigned to synchronized intermittent mandatory ventilation or synchronized intermittent mandatory ventilation plus pressure support. In both groups, weaning followed a set protocol during the first 28 days. Outcomes were assessed during the first 28 days and until discharge or death. There were 107 infants enrolled (53 synchronized intermittent mandatory ventilation plus pressure support and 54 synchronized intermittent mandatory ventilation). Demographic and perinatal data, mortality, and morbidity did not differ between groups. During the first 28 days, infants in the synchronized intermittent mandatory ventilation plus pressure support group reached minimal ventilator settings and were extubated earlier than infants in the synchronized intermittent mandatory ventilation group. Total duration of mechanical ventilation, duration of oxygen dependency, and oxygen need at 36 weeks' postmenstrual age alone or combined with death did not differ between groups. However, infants in synchronized intermittent mandatory ventilation plus pressure support within the 700- to 1000-g birth weight strata had a shorter oxygen dependency. The results of this study suggest that the addition of

New type of chaos synchronization in discrete-time systems: the F-M synchronization

Directory of Open Access Journals (Sweden)

Ouannas Adel

2018-04-01

Full Text Available In this paper, a new type of synchronization for chaotic (hyperchaotic maps with different dimensions is proposed. The novel scheme is called F – M synchronization, since it combines the inverse generalized synchronization (based on a functional relationship F with the matrix projective synchronization (based on a matrix M. In particular, the proposed approach enables F – M synchronization with index d to be achieved between n-dimensional drive system map and m-dimensional response system map, where the synchronization index d corresponds to the dimension of the synchronization error. The technique, which exploits nonlinear controllers and Lyapunov stability theory, proves to be effective in achieving the F – M synchronization not only when the synchronization index d equals n or m, but even if the synchronization index d is larger than the map dimensions n and m. Finally, simulation results are reported, with the aim to illustrate the capabilities of the novel scheme proposed herein.

New type of chaos synchronization in discrete-time systems: the F-M synchronization

Science.gov (United States)

Ouannas, Adel; Grassi, Giuseppe; Karouma, Abdulrahman; Ziar, Toufik; Wang, Xiong; Pham, Viet-Thanh

2018-04-01

In this paper, a new type of synchronization for chaotic (hyperchaotic) maps with different dimensions is proposed. The novel scheme is called F - M synchronization, since it combines the inverse generalized synchronization (based on a functional relationship F) with the matrix projective synchronization (based on a matrix M). In particular, the proposed approach enables F - M synchronization with index d to be achieved between n-dimensional drive system map and m-dimensional response system map, where the synchronization index d corresponds to the dimension of the synchronization error. The technique, which exploits nonlinear controllers and Lyapunov stability theory, proves to be effective in achieving the F - M synchronization not only when the synchronization index d equals n or m, but even if the synchronization index d is larger than the map dimensions n and m. Finally, simulation results are reported, with the aim to illustrate the capabilities of the novel scheme proposed herein.

Diagnósticos de enfermagem em cliente com (TCE e em seu familiar e/ou pessoa significativa

Directory of Open Access Journals (Sweden)

Anialcy Barbosa Faria

1996-12-01

Full Text Available O presente trabalho tem por objetivo relatar o estudo de caso de um cliente com TCE e em seu familiar e/ou pessoa significativa, levantando os Diagnósticos de Enfermagem segundo a Taxonomia I da NANDA (North American Diagnosis Association, utilizando-se a Teoria das Necessidades Humanas Básicas Afetadas de Wanda Horta. O estudo foi realizado no Hospital Universitário Antonio Pedro, UFF, onde foram encontrados 6 diagnósticos de enfermagem para o cliente e 1 para o familiar.

El diagnóstico psicopedagógico en la deficiencia mental

Directory of Open Access Journals (Sweden)

Pilar Andrés Sisamón

2002-01-01

Full Text Available Situándonos en el enfoque del diagnóstico psicopedagógico propuesto por la Asociación Americana de Retraso Mental (AARM y teniendo en cuenta las anteriores perspectivas, intentamos poner de relieve nuestro punto de vista sobre el mismo, destacando la importancia de un diagnóstico adecuado de la persona evaluada debido a las consecuencias determinantes que este diagnóstico lleva implícito. Aun siendo conscientes de que no es el profesor quien directamente realiza el diagnóstico (aunque sí participa en él, consideramos este tema de especial importancia para nuestra formación (futuros maestros de educación especial por su repercusión en el posterior tratamiento.

On Synchronization Primitive Systems.

Science.gov (United States)

The report studies the question: what synchronization primitive should be used to handle inter-process communication. A formal model is presented...between these synchronization primitives. Although only four synchronization primitives are compared, the general methods can be used to compare other... synchronization primitives. Moreover, in the definitions of these synchronization primitives, conditional branches are explicitly allowed. In addition

Synchronization of mobile chaotic oscillator networks

Energy Technology Data Exchange (ETDEWEB)

Fujiwara, Naoya, E-mail: fujiwara@csis.u-tokyo.ac.jp [Center for Spatial Information Science, The University of Tokyo, 277-8568 Chiba (Japan); Kurths, Jürgen [Potsdam Institute for Climate Impact Research (PIK), 14473 Potsdam, Germany and Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen (United Kingdom); Díaz-Guilera, Albert [Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain and Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, Barcelona (Spain)

2016-09-15

We study synchronization of systems in which agents holding chaotic oscillators move in a two-dimensional plane and interact with nearby ones forming a time dependent network. Due to the uncertainty in observing other agents' states, we assume that the interaction contains a certain amount of noise that turns out to be relevant for chaotic dynamics. We find that a synchronization transition takes place by changing a control parameter. But this transition depends on the relative dynamic scale of motion and interaction. When the topology change is slow, we observe an intermittent switching between laminar and burst states close to the transition due to small noise. This novel type of synchronization transition and intermittency can happen even when complete synchronization is linearly stable in the absence of noise. We show that the linear stability of the synchronized state is not a sufficient condition for its stability due to strong fluctuations of the transverse Lyapunov exponent associated with a slow network topology change. Since this effect can be observed within the linearized dynamics, we can expect such an effect in the temporal networks with noisy chaotic oscillators, irrespective of the details of the oscillator dynamics. When the topology change is fast, a linearized approximation describes well the dynamics towards synchrony. These results imply that the fluctuations of the finite-time transverse Lyapunov exponent should also be taken into account to estimate synchronization of the mobile contact networks.

Synchronization of mobile chaotic oscillator networks

International Nuclear Information System (INIS)

Fujiwara, Naoya; Kurths, Jürgen; Díaz-Guilera, Albert

2016-01-01

We study synchronization of systems in which agents holding chaotic oscillators move in a two-dimensional plane and interact with nearby ones forming a time dependent network. Due to the uncertainty in observing other agents' states, we assume that the interaction contains a certain amount of noise that turns out to be relevant for chaotic dynamics. We find that a synchronization transition takes place by changing a control parameter. But this transition depends on the relative dynamic scale of motion and interaction. When the topology change is slow, we observe an intermittent switching between laminar and burst states close to the transition due to small noise. This novel type of synchronization transition and intermittency can happen even when complete synchronization is linearly stable in the absence of noise. We show that the linear stability of the synchronized state is not a sufficient condition for its stability due to strong fluctuations of the transverse Lyapunov exponent associated with a slow network topology change. Since this effect can be observed within the linearized dynamics, we can expect such an effect in the temporal networks with noisy chaotic oscillators, irrespective of the details of the oscillator dynamics. When the topology change is fast, a linearized approximation describes well the dynamics towards synchrony. These results imply that the fluctuations of the finite-time transverse Lyapunov exponent should also be taken into account to estimate synchronization of the mobile contact networks.

Synchronization of mobile chaotic oscillator networks.

Science.gov (United States)

Fujiwara, Naoya; Kurths, Jürgen; Díaz-Guilera, Albert

2016-09-01

We study synchronization of systems in which agents holding chaotic oscillators move in a two-dimensional plane and interact with nearby ones forming a time dependent network. Due to the uncertainty in observing other agents' states, we assume that the interaction contains a certain amount of noise that turns out to be relevant for chaotic dynamics. We find that a synchronization transition takes place by changing a control parameter. But this transition depends on the relative dynamic scale of motion and interaction. When the topology change is slow, we observe an intermittent switching between laminar and burst states close to the transition due to small noise. This novel type of synchronization transition and intermittency can happen even when complete synchronization is linearly stable in the absence of noise. We show that the linear stability of the synchronized state is not a sufficient condition for its stability due to strong fluctuations of the transverse Lyapunov exponent associated with a slow network topology change. Since this effect can be observed within the linearized dynamics, we can expect such an effect in the temporal networks with noisy chaotic oscillators, irrespective of the details of the oscillator dynamics. When the topology change is fast, a linearized approximation describes well the dynamics towards synchrony. These results imply that the fluctuations of the finite-time transverse Lyapunov exponent should also be taken into account to estimate synchronization of the mobile contact networks.

Synchronization of a Class of Memristive Stochastic Bidirectional Associative Memory Neural Networks with Mixed Time-Varying Delays via Sampled-Data Control

Directory of Open Access Journals (Sweden)

Manman Yuan

2018-01-01

Full Text Available The paper addresses the issue of synchronization of memristive bidirectional associative memory neural networks (MBAMNNs with mixed time-varying delays and stochastic perturbation via a sampled-data controller. First, we propose a new model of MBAMNNs with mixed time-varying delays. In the proposed approach, the mixed delays include time-varying distributed delays and discrete delays. Second, we design a new method of sampled-data control for the stochastic MBAMNNs. Traditional control methods lack the capability of reflecting variable synaptic weights. In this paper, the methods are carefully designed to confirm the synchronization processes are suitable for the feather of the memristor. Third, sufficient criteria guaranteeing the synchronization of the systems are derived based on the derive-response concept. Finally, the effectiveness of the proposed mechanism is validated with numerical experiments.

Bodily Synchronization Underlying Joke Telling

Directory of Open Access Journals (Sweden)

R. C. Schmidt

2014-08-01

Full Text Available Advances in video and time series analysis have greatly enhanced our ability to study the bodily synchronization that occurs in natural interactions. Past research has demonstrated that the behavioral synchronization involved in social interactions is similar to dynamical synchronization found generically in nature. The present study investigated how the bodily synchronization in a joke telling task is spread across different nested temporal scales. Pairs of participants enacted knock-knock jokes and times series of their bodily activity were recorded. Coherence and relative phase analyses were used to evaluate the synchronization of bodily rhythms for the whole trial as well as at the subsidiary time scales of the whole joke, the setup of the punch line, the two-person exchange and the utterance. The analyses revealed greater than chance entrainment of the joke teller’s and joke responder’s movements at all time scales and that the relative phasing of the teller’s movements led those of the responder at the longer time scales. Moreover, this entrainment was greater when visual information about the partner’s movements was present but was decreased particularly at the shorter time scales when explicit gesturing in telling the joke was performed. In short, the results demonstrate that a complex interpersonal bodily dance occurs during structured conversation interactions and that this dance is constructed from a set of rhythms associated with the nested behavioral structure of the interaction.

Stages of chaotic synchronization.

Science.gov (United States)

Tang, D. Y.; Dykstra, R.; Hamilton, M. W.; Heckenberg, N. R.

1998-09-01

In an experimental investigation of the response of a chaotic system to a chaotic driving force, we have observed synchronization of chaos of the response system in the forms of generalized synchronization, phase synchronization, and lag synchronization to the driving signal. In this paper we compare the features of these forms of synchronized chaos and study their relations and physical origins. We found that different forms of chaotic synchronization could be interpreted as different stages of nonlinear interaction between the coupled chaotic systems. (c) 1998 American Institute of Physics.

Obesidad en la infancia: Diagnóstico y tratamiento

Directory of Open Access Journals (Sweden)

Georgina María Zayas Torriente

2002-09-01

Full Text Available Se trata de abordar el diagnóstico y tratamiento de la obesidad en los niños y adolescentes, pues la obesidad es una afección reemergente en la población infantil y se estima que alrededor de 1/3 de todos los niños son obesos, de ahí la importancia de un diagnóstico precoz y un tratamiento oportuno. Además preocupa el incremento notorio de los factores ambientales responsables de su determinismo, así como los problemas psicosociales, ortopédicos y de diversa índole que la acompañan. La obesidad es un factor de riesgo asociado en la génesis o desarrollo de las enfermedades crónicas no trasmisibles, por lo tanto es necesario mejorar el conocimiento en el diagnóstico e institucionalizar programas comunitarios para su tratamiento y prevención.The diagnosis and treatment of obesity in children and adolescents are dealt with in this paper, since obesity is considered as a reemerging affection in the infant population. It is estimated that approximately one third of all children are obese and that’s why its early diagnosis and timely treatment are so important. Besides, the significant increase of the environmental factors responsible for its determinisn, as well as the psychosocial and orthopedic problems and others of diverse nature accompanying it have arisen a lot of concern. Obesity is a risk factor associated with the genesis or development of non-communicable chronic diseases; therefore, it is necessary to improve the knowledge about its diagnosis and to institutionalize community programs for its treatment and prevention.

Synchronous ethernet and IEEE 1588 in telecoms next generation synchronization networks

CERN Document Server

2013-01-01

This book addresses the multiple technical aspects of the distribution of synchronization in new generation telecommunication networks, focusing in particular on synchronous Ethernet and IEEE1588 technologies. Many packet network engineers struggle with understanding the challenges that precise synchronization distribution can impose on networks. The usual “why”, “when” and particularly “how” can cause problems for many engineers. In parallel to this, some other markets have identical synchronization requirements, but with their own design requirements, generating further questions. This book attempts to respond to the different questions by providing background technical information. Invaluable information on state of-the-art packet network synchronization and timing architectures is provided, as well as an unbiased view on the synchronization technologies that have been internationally standardized over recent years, with the aim of providing the average reader (who is not skilled in the art) wi...

Validação do diagnóstico de enfermagem Angústia Espiritual: análise por especialistas Validación del diagnóstico de enfermería Angustia Espiritual: análisis por especialistas Validation of the nursing diagnosis Spiritual Anguish: analysis by experts

Directory of Open Access Journals (Sweden)

Erika de Cássia Lopes Chaves

2010-04-01

Full Text Available OBJETIVO: Realizar a validação de conteúdo do diagnóstico de enfermagem Angústia espiritual. MÉTODOS: Utilizando o referencial metodológico proposto por Fehring, foi empregado um questionário semi-estruturado, respondido por uma amostra de 72 enfermeiros, para avaliação do título, definição e características definidoras do diagnóstico Angústia espiritual, bem como, sua disposição na Taxonomia II da North American Nursing Diagnosis Association. RESULTADOS: O melhor domínio para classificação do diagnóstico em estudo, segundo os enfermeiros peritos, é o Domínio 10; no entanto, suas classes requerem revisão. Espiritualidade prejudicada demonstrou ser um título adequado ao conceito investigado. A validação das características definidoras identificou sete delas como importantes indicadores clínicos do diagnóstico e apenas a característica não se interessa pela natureza foi considerada pouco relevante. O escore total do diagnóstico foi 0,72, sendo, portanto, considerado validado. CONCLUSÃO: Uma nova proposta apresentada ao fenômeno em estudo foi considerada pertinente. Este estudo pode oferecer subsídios para a validação clínica do diagnóstico investigado.OBJETIVO: Realizar la validación de contenido del diagnóstico de enfermería Angustia espiritual. MÉTODOS: Utilizando el marco metodológico propuesto por Fehring, fue empleado un cuestionario semi-estructurado, respondido por una muestra de 72 enfermeros, para evaluar el título, definición y características definidoras del diagnóstico Angustia espiritual, así como, la clasificación en la Taxonomía II de la North American Nursing Diagnosis Association. RESULTADOS: El mejor dominio para la clasificación del diagnóstico en estudio, según los enfermeros peritos, es el Dominio 10; sin embargo, sus clases requieren revisión. La Espiritualidad perjudicada demostró ser un título adecuado para el concepto investigado. La validación de las caracter

Impulsive Synchronization and Adaptive-Impulsive Synchronization of a Novel Financial Hyperchaotic System

Directory of Open Access Journals (Sweden)

Xiuli Chai

2013-01-01

Full Text Available The impulsive synchronization and adaptive-impulsive synchronization of a novel financial hyperchaotic system are investigated. Based on comparing principle for impulsive functional differential equations, several sufficient conditions for impulsive synchronization are derived, and the upper bounds of impulsive interval for stable synchronization are estimated. Furthermore, a nonlinear adaptive-impulsive control scheme is designed to synchronize the financial system using invariant principle of impulsive dynamical systems. Moreover, corresponding numerical simulations are presented to illustrate the effectiveness and feasibility of the proposed methods.

O problema do diagnóstico em psicopatologia

Directory of Open Access Journals (Sweden)

Gilda Paoliello

Full Text Available A autora discute a questão do diagnóstico em psiquiatria, confrontando-o com o diagnóstico em medicina. Critica a tendência atual de se referenciar a psiquiatria no paradigma médico-científico, o que leva à exclusão do sujeito, do psiquiatra e da própria clínica. Propõe o resgate da clínica em suas referências clássicas, aliada à ética do sujeito.

Bifurcation behaviors of synchronized regions in logistic map networks with coupling delay

International Nuclear Information System (INIS)

Tang, Longkun; Wu, Xiaoqun; Lu, Jun-an; Lü, Jinhu

2015-01-01

Network synchronized regions play an extremely important role in network synchronization according to the master stability function framework. This paper focuses on network synchronous state stability via studying the effects of nodal dynamics, coupling delay, and coupling way on synchronized regions in Logistic map networks. Theoretical and numerical investigations show that (1) network synchronization is closely associated with its nodal dynamics. Particularly, the synchronized region bifurcation points through which the synchronized region switches from one type to another are in good agreement with those of the uncoupled node system, and chaotic nodal dynamics can greatly impede network synchronization. (2) The coupling delay generally impairs the synchronizability of Logistic map networks, which is also dominated by the parity of delay for some nodal parameters. (3) A simple nonlinear coupling facilitates network synchronization more than the linear one does. The results found in this paper will help to intensify our understanding for the synchronous state stability in discrete-time networks with coupling delay

Trauma complexo e suas implicações diagnósticas Complex trauma and diagnostic implications

Directory of Open Access Journals (Sweden)

Thiago Wendt Viola

2011-01-01

Full Text Available A exposição prolongada a múltiplos eventos traumáticos de natureza interpessoal, sobretudo durante o desenvolvimento, tem demonstrado consequências e sintomas psiquiátricos não considerados pelo atual diagnóstico de transtorno de estresse pós-traumático (TEPT. Essas situações negativas e crônicas durante a infância e adolescência evidenciam a existência de uma síndrome psicopatológica associada a complexas (desadaptações a efeitos traumáticos diversos. A ausência de um diagnóstico coeso e fidedigno para essas vítimas interfere negativamente na identificação sintomatológica e no método de tratamento. O presente trabalho visa revisar a definição de trauma, apresentando o conceito de trauma complexo, explorando suas implicações clínicas, bem como as categorias diagnósticas derivadas desse constructo. Importantes questões são levantadas acerca das diferenças entre trauma complexo e TEPT, investigando os sintomas e transtornos comórbidos ao diagnóstico de TEPT, assim como as limitações inerentes a esse diagnóstico. Considerando o impacto psicopatológico relacionado ao trauma complexo, discute-se a possível inserção de uma nova categoria diagnóstica na 5ª versão do Manual Diagnóstico e Estatístico dos Transtornos Mentais, adjunta ao espectro de psicopatologias pós-traumáticas.Prolonged exposure to multiple traumatic events of an interpersonal nature, particularly during development, has shown psychological consequences and symptoms not included among the current diagnostic criteria of post-traumatic stress disorder (PTSD. These negative and chronic situations during childhood and adolescence provide further evidence of the existence of a psychopathological syndrome associated with complex (disadaptations to a number of traumatic effects. The absence of a cohesive and reliable diagnosis for these patients negatively affects symptom identification and treatment planning. The aim of the present study

Pinning-controlled synchronization of complex networks with bounded or unbounded synchronized regions

International Nuclear Information System (INIS)

Yan-Li, Zou; Guan-Rong, Chen

2009-01-01

This paper studies pinning-controlled synchronization of complex networks with bounded or unbounded synchronized regions. To study a state-feedback pinning-controlled network with N nodes, it first converts the controlled network to an extended network of N+1 nodes without controls. It is shown that the controlled synchronizability of the given network is determined by the real part of the smallest nonzero eigenvalue of the coupling matrix of its extended network when the synchronized region is unbounded; but it is determined by the ratio of the real parts of the largest and the smallest nonzero eigenvalues of the coupling matrix when the synchronized region is bounded. Both theoretical analysis and numerical simulation show that the portion of controlled nodes has no critical values when the synchronized region is unbounded, but it has a critical value when the synchronized region is bounded. In the former case, therefore, it is possible to control the network to achieve synchronization by pinning only one node. In the latter case, the network can achieve controlled synchronization only when the portion of controlled nodes is larger than the critical value. (general)

Realistic thermodynamic and statistical-mechanical measures for neural synchronization.

Science.gov (United States)

Kim, Sang-Yoon; Lim, Woochang

2014-04-15

Synchronized brain rhythms, associated with diverse cognitive functions, have been observed in electrical recordings of brain activity. Neural synchronization may be well described by using the population-averaged global potential VG in computational neuroscience. The time-averaged fluctuation of VG plays the role of a "thermodynamic" order parameter O used for describing the synchrony-asynchrony transition in neural systems. Population spike synchronization may be well visualized in the raster plot of neural spikes. The degree of neural synchronization seen in the raster plot is well measured in terms of a "statistical-mechanical" spike-based measure Ms introduced by considering the occupation and the pacing patterns of spikes. The global potential VG is also used to give a reference global cycle for the calculation of Ms. Hence, VG becomes an important collective quantity because it is associated with calculation of both O and Ms. However, it is practically difficult to directly get VG in real experiments. To overcome this difficulty, instead of VG, we employ the instantaneous population spike rate (IPSR) which can be obtained in experiments, and develop realistic thermodynamic and statistical-mechanical measures, based on IPSR, to make practical characterization of the neural synchronization in both computational and experimental neuroscience. Particularly, more accurate characterization of weak sparse spike synchronization can be achieved in terms of realistic statistical-mechanical IPSR-based measure, in comparison with the conventional measure based on VG. Copyright © 2014. Published by Elsevier B.V.

LLC: critérios diagnósticos, imunofenotipagem e diagnóstico diferencial CLL: diagnostic criteria, immunophenotyping and differential diagnosis

Directory of Open Access Journals (Sweden)

Irene Lorand-Metze

2005-12-01

Full Text Available O diagnóstico da LLC é baseado em dados do hemograma e da imunofenotipagem dos linfócitos periféricos: linfocitose acima de 5 (ou 10 x 10(9/L com fenótipo CD19, CD5, CD23 e expressão fraca de imunoglobulinas de superfície monoclonais. A expressão de CD38 ocorre em cerca da metade dos casos e tem relação com o estado não mutado de Ig V. A biópsia de medula só deverá ser realizada antes do tratamento ou quando os dois exames acima não permitirem um diagnóstico definitivo. O diagnóstico diferencial é com os outros linfomas B indolentes, que freqüentemente apresentam células neoplásicas circulantes. Este diagnóstico diferencial é baseado na imunofenotipagem, biópsia de medula ou linfonodo.The diagnosis of CLL is based on the finding of peripheral lymphocytosis of over 5 (or 10 x 10(9/L presenting the CD19, CD5, CD23 phenotype and a weak monoclonal expression of membrane immunoglobulins. The CD38 expression is observed in half of the cases and is correlated with the unmutated status of the Ig V gene. Bone marrow biopsy should only be performed before starting treatment or if necessary for the differential diagnosis with other low-grade lymphomas. This differential diagnosis is based on the morphology of circulating lymphocytes, their immunophenotypes and pattern of bone marrow infiltration.

Synchronization on effective networks

International Nuclear Information System (INIS)

Zhou Tao; Zhao Ming; Zhou Changsong

2010-01-01

The study of network synchronization has attracted increasing attentionrecently. In this paper, we strictly define a class of networks, namely effective networks, which are synchronizable and orientable networks. We can prove that all the effective networks with the same size have the same spectra, and are of the best synchronizability according to the master stability analysis. However, it is found that the synchronization time for different effective networks can be quite different. Further analysis shows that the key ingredient affecting the synchronization time is the maximal depth of an effective network: the larger depth results in a longer synchronization time. The secondary factor is the number of links. The increasing number of links connecting nodes in the same layer (horizontal links) will lead to longer synchronization time, whereas the increasing number of links connecting nodes in neighboring layers (vertical links) will accelerate the synchronization. Our analysis of the relationship between the structure and synchronization properties of the original and effective networks shows that the purely directed effective network can provide an approximation of the original weighted network with normalized input strength. Our findings provide insights into the roles of depth, horizontal and vertical links in the synchronizing process, and suggest that the spectral analysis is helpful yet insufficient for the comprehensive understanding of network synchronization.

Synchronization on effective networks

Energy Technology Data Exchange (ETDEWEB)

Zhou Tao [Web Sciences Center, University of Electronic Science and Technology of China, Chengdu 610054 (China); Zhao Ming [Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China); Zhou Changsong, E-mail: cszhou@hkbu.edu.h [Department of Physics, Hong Kong Baptist University, Kowloon Tong (Hong Kong)

2010-04-15

The study of network synchronization has attracted increasing attentionrecently. In this paper, we strictly define a class of networks, namely effective networks, which are synchronizable and orientable networks. We can prove that all the effective networks with the same size have the same spectra, and are of the best synchronizability according to the master stability analysis. However, it is found that the synchronization time for different effective networks can be quite different. Further analysis shows that the key ingredient affecting the synchronization time is the maximal depth of an effective network: the larger depth results in a longer synchronization time. The secondary factor is the number of links. The increasing number of links connecting nodes in the same layer (horizontal links) will lead to longer synchronization time, whereas the increasing number of links connecting nodes in neighboring layers (vertical links) will accelerate the synchronization. Our analysis of the relationship between the structure and synchronization properties of the original and effective networks shows that the purely directed effective network can provide an approximation of the original weighted network with normalized input strength. Our findings provide insights into the roles of depth, horizontal and vertical links in the synchronizing process, and suggest that the spectral analysis is helpful yet insufficient for the comprehensive understanding of network synchronization.

Sífilis cardiovascular: Diagnóstico y tratamiento

OpenAIRE

Carrada-Bravo,Teodoro

2006-01-01

La sífilis cardiovascular terciaria puede producir aortitis, aneurisma aórtico, estenosis de las coronarias, insuficiencia aórtica y rara vez miocarditis. El médico debe estar familiarizado con las presentaciones clínicas de este proceso incluso las lesiones asintomáticas, y debe ser capaz de llevar a cabo un plan de diagnóstico y de evaluación bien organizado, para establecer o excluir la existencia de la patología cardiovascular y su diagnóstico diferencial con otras entidades. Cuando se ha...

Diagnóstico de salud comunitaria de Alcanar

OpenAIRE

Ros Cardo, I.; Llagostera Reverter, Irene; Ventura Pérez, A.; Pitarch Albado, C.; Roda Julio, N.; Salas Medina, Pablo

2013-01-01

Introducción: El diagnóstico de salud es el resultado de un estudio epidemiológico de una comunidad, a partir de una descripción y análisis de las necesidades de salud. Es decir, es la medición del estado de salud de la población en un momento determinado mediante indicadores de salud. Objetivos: Generales: Analizar la situación de salud e identificar las necesidades poblacionales reconocidas. Secundarios: Identificar los elementos necesario que permitan la elaboración del diagnóstico de salu...

Optimum off-line trace synchronization of computer clusters

International Nuclear Information System (INIS)

Jabbarifar, Masoume; Dagenais, Michel; Roy, Robert; Sendi, Alireza Shameli

2012-01-01

A tracing and monitoring framework produces detailed execution trace files for a system. Each trace file contains events with associated timestamps based on the local clock of their respective system, which are not perfectly synchronized. To monitor all behavior in multi-core distributed systems, a global time reference is required, thus the need for traces synchronization techniques. The synchronization is time consuming when there is a cluster of many computers. In this paper we propose an optimized technique to reduce the total synchronization time. Compared with related techniques that have been used on kernel level traces, this method improves the performance while maintaining a high accuracy. It uses the packet rate and the hop count as two major criteria to focus the computation on more accurate network links during synchronization. These criteria, tested in real-word experiments, were identified as most important features of a network. Furthermore, we present numerical and analytical evaluation results, and compare these with previous methods demonstrating the accuracy and the performance of the method.

Community Pharmacist Attitudes on Medication Synchronization Programs

Directory of Open Access Journals (Sweden)

Matthew Witry

2017-05-01

Full Text Available Background: Medication synchronization is a service offered by an increasing number of community pharmacies that aligns refilling of a patient’s multiple medications. Purported benefits include increased adherence and improved dispensing efficiency. Objective: To assess community pharmacist agreement with a set of declarative statements about medication synchronization programs and to identify variation related to pharmacist characteristics. Methods: In 2015, a cross-sectional survey was mailed to 1,000 pharmacists from 5 Midwestern U.S. states using 4-contacts and an online option. Respondents used a 7-point Likert scale to agree or disagree with 5 statements about medication synchronization. Demographic and workplace characteristics were collected. Data were analyzed using descriptive statistics and factor analysis. Multiple linear regression tested the relationship between pharmacist characteristics and a 4-item attitude composite. Results: There were 258 usable responses for a response rate of 28.8%. About half (45.0% reported their pharmacy offered medication synchronization. Most pharmacists (82.6% agreed this service has a positive impact on patient adherence but 57% agreed that a “significant change to workflow” was or would be required. Pharmacist agreement that the program provides financial benefits to the pharmacy was higher than agreement that the service provides more opportunities for patient interactions (p<0.001. In the multiple regression analysis, having a PharmD and working at a pharmacy offering Medication Therapy Management were associated with more positive scores on the medication synchronization benefits composite whereas working in a staff role (rather than a manager/owner was lower. No demographic predictors were significantly associated with agreeing that a significant change to workflow would be required for implementation. Conclusions: Pharmacists generally were positive about medication synchronization

Synchronization of chaotic systems

International Nuclear Information System (INIS)

Pecora, Louis M.; Carroll, Thomas L.

2015-01-01

We review some of the history and early work in the area of synchronization in chaotic systems. We start with our own discovery of the phenomenon, but go on to establish the historical timeline of this topic back to the earliest known paper. The topic of synchronization of chaotic systems has always been intriguing, since chaotic systems are known to resist synchronization because of their positive Lyapunov exponents. The convergence of the two systems to identical trajectories is a surprise. We show how people originally thought about this process and how the concept of synchronization changed over the years to a more geometric view using synchronization manifolds. We also show that building synchronizing systems leads naturally to engineering more complex systems whose constituents are chaotic, but which can be tuned to output various chaotic signals. We finally end up at a topic that is still in very active exploration today and that is synchronization of dynamical systems in networks of oscillators

Stress-associated synchronization and desynchronization in geologic and biologic systems

Science.gov (United States)

Kluchevsky, A. V.; Kluchevskaya, A. A.

2010-12-01

Variations in the annual numbers of representative earthquakes in three areas and six districts of the Baikal rift zone in 1964-2002 were subjected to correlation analysis. Episodes of significant correlations of shock flow rates were found against the background of chaotic seismic activity. They followed the rearrangements (catastrophes) of stresses in the lithosphere, which are also stressing factors for the whole rift geodynamic system. The episode of the late 1970s-early 1980s was particularly long and showed the maximum correlation. Therefore, it can be considered the principal event in seismic process synchronization in the Baikal Rift Zone. The same approach to data analysis revealed similar synchronization and desynchronization phenomena in the behavior of Baikalian turbellaria when they deviated from homeostasis as a result of illumination, which is a stress for this biologic system. Possible reasons for the behavior of biologic and geodynamic systems are discussed in terms of the synergetic concept of phenomena in living and nonliving nature.

Ultrassonografia no diagnóstico da tendinite e eletroneuromiografia no diagnóstico da neuropatia periférica e da radiculopatia do membro superior: visão do reumatologista

Directory of Open Access Journals (Sweden)

Milton Helfenstein Jr

2013-06-01

Full Text Available OBJETIVO: Averiguar o valor que os reumatologistas brasileiros conferem ao exame de ultrassonografia para o diagnóstico de tendinite e ao exame de eletroneuromiografia para o diagnóstico da neuropatia periférica e da radiculopatia dos membros superiores. MATERIAL E MÉTODOS: No total, 165 reumatologistas responderam a uma pesquisa de opinião anônima (enviada pela internet, sobre diversas situações relativas aos dois exames, no que diz respeito aos seguintes questionamentos: confiabilidade, precisão no diagnóstico, importância e necessidade desses exames para confirmação diagnóstica e credibilidade e treinamento dos profissionais que executam os exames. RESULTADOS: O estudo revelou que a maioria dos reumatologistas reconhece que esses exames são operador-dependentes, que não confia integralmente nos resultados observados, que tais exames não são imperativos para os diagnósticos elencados, e que os profissionais que executam esses exames deveriam ser mais bem treinados para fornecer resultados mais confiantes. CONCLUSÃO: Para os reumatologistas brasileiros, os resultados desses exames devem ser interpretados com cautela e não são definitivos para o diagnóstico; a ultrassonografia musculoesquelética e a eletroneuromiografia devem ser realizadas por profissionais capacitados; deve haver melhor preparo dos executores desses exames em nosso meio.

Average contraction and synchronization of complex switched networks

International Nuclear Information System (INIS)

Wang Lei; Wang Qingguo

2012-01-01

This paper introduces an average contraction analysis for nonlinear switched systems and applies it to investigating the synchronization of complex networks of coupled systems with switching topology. For a general nonlinear system with a time-dependent switching law, a basic convergence result is presented according to average contraction analysis, and a special case where trajectories of a distributed switched system converge to a linear subspace is then investigated. Synchronization is viewed as the special case with all trajectories approaching the synchronization manifold, and is thus studied for complex networks of coupled oscillators with switching topology. It is shown that the synchronization of a complex switched network can be evaluated by the dynamics of an isolated node, the coupling strength and the time average of the smallest eigenvalue associated with the Laplacians of switching topology and the coupling fashion. Finally, numerical simulations illustrate the effectiveness of the proposed methods. (paper)

Content-based intermedia synchronization

Science.gov (United States)

Oh, Dong-Young; Sampath-Kumar, Srihari; Rangan, P. Venkat

1995-03-01

Inter-media synchronization methods developed until now have been based on syntactic timestamping of video frames and audio samples. These methods are not fully appropriate for the synchronization of multimedia objects which may have to be accessed individually by their contents, e.g. content-base data retrieval. We propose a content-based multimedia synchronization scheme in which a media stream is viewed as hierarchial composition of smaller objects which are logically structured based on the contents, and the synchronization is achieved by deriving temporal relations among logical units of media object. content-based synchronization offers several advantages such as, elimination of the need for time stamping, freedom from limitations of jitter, synchronization of independently captured media objects in video editing, and compensation for inherent asynchronies in capture times of video and audio.

Diagnóstico. Historia y examen físico

Directory of Open Access Journals (Sweden)

Álvaro Pérez Martín

2014-01-01

Full Text Available El médico de familia tiene un papel clave en el diagnóstico y manejo del paciente artrósico. El diagnóstico es fundamentalmente clínico y radiológico, y se debe realizar una anamnesis completa junto con una exploración articular meticulosa. La anamnesis debe dirigirse a detectar la existencia de factores de riesgo y sintomatología clínica compatible. Debemos averiguar las características del dolor distinguiendo si es mecánico o inflamatorio y realizar una exploración exhaustiva articular valorando la existencia de dolor, deformidad, limitación de la movilidad, tanto activa como pasiva, crepitación, presencia de derrame articular e inflamación. El diagnóstico diferencial debe realizarse con todas las enfermedades que afecten a las articulaciones y/o produzcan rigidez en ellas.

Mobility induces global synchronization of oscillators in periodic extended systems

International Nuclear Information System (INIS)

Peruani, Fernando; Nicola, Ernesto M; Morelli, Luis G

2010-01-01

We study the synchronization of locally coupled noisy phase oscillators that move diffusively in a one-dimensional ring. Together with the disordered and the globally synchronized states, the system also exhibits wave-like states displaying local order. We use a statistical description valid for a large number of oscillators to show that for any finite system there is a critical mobility above which all wave-like solutions become unstable. Through Langevin simulations, we show that the transition to global synchronization is mediated by a shift in the relative size of attractor basins associated with wave-like states. Mobility disrupts these states and paves the way for the system to attain global synchronization.

Fast Self-Synchronization between LowVoltage Microgrid and Inverter using Virtual Synchronous Converter

Directory of Open Access Journals (Sweden)

Md Ruhul Amin

2017-12-01

Full Text Available In this paper, a fast self-synchronization known as virtual synchronous converter (VSCon between single-phase microgrid and inverter in low-voltage microgrid, has been developed in Matlab/Simulink. The idea is to any phase locked loop (PLL circuit for inverter-microgrid synchronization in order to improve the synchronization time. As known, it is difficult and lengthy process to tune the PLL gain parameters to reach suitable performance for synchronizing among the voltage, phase-angle and frequency between them. Due to this problem, a fast self synchronization technique is needed in order to minimize the time losses at the microgrid connection. Therefore, the VSCon has been developed which is based on the synchronous generator mathematical model but in virtual environment representation. It has been applied in the inverter control for generating switching pattern to the inverter switches in order to respond to the grid voltage for improve the synchronization. For a prove of concept, several simulation tests in MATLAB models have been conducted, in order to see the effectiveness of this VSCon. First test has been conducted, when a 240V, 50Hz frequency grid source is used for observing the self-synchronization the system with the power flows output. Furthermore, the next test is conducted when the grid frequency is changed from the rated frequency at 50Hz to 51Hz and the result shows the VSCon in inverter control takes nearly 40ms to synchronize to this new frequency value. The test on grid phase-angle delay also been tested when ac grid voltage has 150 phase delay. As from all the results, the improved inverter control with VSCon structure is able to have fast and self-synchronized between the invertergrid connection before the power from the inverter can be transferred.

Pacientes transplantados renais: análise de associação dos diagnósticos de enfermagem Pacientes trasplantados renales: análisis de asociación de los diagnósticos enfermeros Kidney transplanted patients: nursing diagnoses association analysis

Directory of Open Access Journals (Sweden)

Ana Luisa Brandão de Carvalho Lira

2010-03-01

ón de diagnósticos enfermeros relacionados a características específicas de estos pacientes.Chronic kidney inadequacy is a disease with serious physical, psychological and socioeconomic implications for the patient. The renal transplant provides life quality to chronic renal patients. The purpose of this study is to analyze associations among nursing diagnoses, related factors and defining characteristics present in renal transplanted patients of a university hospital. A descriptive, exploratory, cross sectional study was performed with 58 patients from December, 2004 to April, 2005. Data collection instruments were: interview scripts and physical exams. Results showed associations between Sleep pattern disturbance and Sexual dysfunction, Sleep pattern disturbance and Altered sexuality pattern, Sexual dysfunction and Altered sexuality pattern. The study contributes for the identification of nursing diagnoses related to specific characteristics of these patients.

Synchronization of Multipoint Hoists

Science.gov (United States)

A contractor has conceived an electrohydraulic feedback system that will provide position synchronization of four aircraft cargo hoists. To... synchronized hoist system. Test results show that the feedback system concept provides adequate synchronization control; i.e., the platform pitch and roll

Surgimiento, evolución y dificultades del diagnóstico de transexualismo

OpenAIRE

María Fernández Rodríquez; Elena García-Vega

2012-01-01

Se realiza un recorrido histórico a través de las distintas versiones de la Clasificación Internacional de Enfermedades (C.I.E.) y del Manual Diagnóstico y Estadístico de los Trastornos Mentales (D.S.M.). Se pretende analizar la aparición del diagnóstico de transexualismo y su evolución hasta llegar hasta la clasificación actualmente en vigor (DSM-IV-TR). Por último, se expondrán algunas de las dificultades encontradas en el proceso de diagnóstico.

Diagnóstico do embolismo pulmonar

Directory of Open Access Journals (Sweden)

João Castaño

2003-03-01

Full Text Available RESUMO: O diagnóstico do Embolismo Pulmonar é considerado por vezes difícil. É importante reconhecer as situações clínicas que podem ser potencialmente desencadeantes. Existe uma série de meios auxiliares de diagnóstico, quer laboratoriais quer imagiológicos, que devem ser adaptados aos meios disponíveis em cada instituição.REV PORT PNEUMOL 2003; IX (2: 129-137 ABSTRACT: Pulmonary Embolism is often considered a difficult diagnosis to establish. It is important to recognise clinical situations that leads to it. There are a few laboratory and imaging tests, that should be tailored to the available facilities in each institution.REV PORT PNEUMOL 2003; IX (2: 129-137 Palavaras-chave: Tromboembolismo Pulmonar, Pulmão, Perfusão Pulmonar, Tomografia Computorizada (TC, Angiografia, Helicoidal, Key-words: Pulmonary Embolism, Lung, Lung Perfusion, Computed Tomography (CT, Angiography, Helical

Synchronization and chaotic dynamics of coupled mechanical metronomes

Science.gov (United States)

Ulrichs, Henning; Mann, Andreas; Parlitz, Ulrich

2009-12-01

Synchronization scenarios of coupled mechanical metronomes are studied by means of numerical simulations showing the onset of synchronization for two, three, and 100 globally coupled metronomes in terms of Arnol'd tongues in parameter space and a Kuramoto transition as a function of coupling strength. Furthermore, we study the dynamics of metronomes where overturning is possible. In this case hyperchaotic dynamics associated with some diffusion process in configuration space is observed, indicating the potential complexity of metronome dynamics.

Synchronization and fault-masking in redundant real-time systems

Science.gov (United States)

Krishna, C. M.; Shin, K. G.; Butler, R. W.

1983-01-01

A real time computer may fail because of massive component failures or not responding quickly enough to satisfy real time requirements. An increase in redundancy - a conventional means of improving reliability - can improve the former but can - in some cases - degrade the latter considerably due to the overhead associated with redundancy management, namely the time delay resulting from synchronization and voting/interactive consistency techniques. The implications of synchronization and voting/interactive consistency algorithms in N-modular clusters on reliability are considered. All these studies were carried out in the context of real time applications. As a demonstrative example, we have analyzed results from experiments conducted at the NASA Airlab on the Software Implemented Fault Tolerance (SIFT) computer. This analysis has indeed indicated that in most real time applications, it is better to employ hardware synchronization instead of software synchronization and not allow reconfiguration.

Cell Division Synchronization

Science.gov (United States)

The report summarizes the progress in the design and construction of automatic equipment for synchronizing cell division in culture by periodic...Concurrent experiments in hypothermic synchronization of algal cell division are reported.

Diagnóstico por el laboratorio de las enfermedades periodontales y periimplantarias

OpenAIRE

Bullon, Pedro

2003-01-01

Desde el punto de vista epidemiológico la enfermedad periodontal tiene una enorme trascendencia. El diagnóstico del proceso es una necesidad para, con arreglo a él, realizar el tratamiento y la prevención mas propiada. El enfoque del diagnóstico depende del concepto que sobre la patogenia se tiene en un momento dado. Desde esa perspectiva se hace un análisis de los distintos métodos de diagnóstico que existen. Se llega a la conclusión de que actualmente el método clínico, mediante el sonda...

Synchronization dynamics of two different dynamical systems

International Nuclear Information System (INIS)

Luo, Albert C.J.; Min Fuhong

2011-01-01

Highlights: → Synchronization dynamics of two distinct dynamical systems. → Synchronization, de-synchronization and instantaneous synchronization. → A controlled pendulum synchronizing with the Duffing oscillator. → Synchronization invariant set. → Synchronization parameter map. - Abstract: In this paper, synchronization dynamics of two different dynamical systems is investigated through the theory of discontinuous dynamical systems. The necessary and sufficient conditions for the synchronization, de-synchronization and instantaneous synchronization (penetration or grazing) are presented. Using such a synchronization theory, the synchronization of a controlled pendulum with the Duffing oscillator is systematically discussed as a sampled problem, and the corresponding analytical conditions for the synchronization are presented. The synchronization parameter study is carried out for a better understanding of synchronization characteristics of the controlled pendulum and the Duffing oscillator. Finally, the partial and full synchronizations of the controlled pendulum with periodic and chaotic motions are presented to illustrate the analytical conditions. The synchronization of the Duffing oscillator and pendulum are investigated in order to show the usefulness and efficiency of the methodology in this paper. The synchronization invariant domain is obtained. The technique presented in this paper should have a wide spectrum of applications in engineering. For example, this technique can be applied to the maneuvering target tracking, and the others.

FPGA based fast synchronous serial multi-wire links synchronization

Science.gov (United States)

Pozniak, Krzysztof T.

2013-10-01

The paper debates synchronization method of multi-wire, serial link of constant latency, by means of pseudo-random numbers generators. The solution was designed for various families of FPGA circuits. There were debated synchronization algorithm and functional structure of parameterized transmitter and receiver modules. The modules were realized in VHDL language in a behavioral form.

Desarrollo de la Investigación en Diagnósticos de Enfermería

Directory of Open Access Journals (Sweden)

Wilson Cañón-Montañéz

2010-12-01

Full Text Available Introducción: La herramienta que le permite a la profesión de enfermería identificar su quehacer es el proceso de enfermería, basado en la utilización de clasificaciones estandarizadas para diagnósticos de enfermería, resultados esperados e intervenciones.La investigación en diagnósticos de enfermería ha evolucionado en los últimos años. Objetivo: Revisión de la literatura para valorar el desarrollo de la investigaciónen diagnósticos de enfermería. Materiales y Métodos: Una búsqueda de la literatura describe una ampliavariedad de diseños metodológicos en la investigación de los diagnósticos de enfermería. Resultados: La revisión de la literatura mostró estudios publicados para identificar los diagnósticos de enfermería más frecuentes en los servicios de atención y en las diferentes esferas del ciclo vital. Asimismo, se evidenciaron estudios de validación de diagnósticos de enfermería. Discusión y Conclusiones: El uso de un lenguaje común basado en los diagnósticos de enfermería, los resultados esperados y las intervenciones, permitirá a los profesionales de enfermería focalizar y priorizar los planes de atención individualizados a los sujetos de cuidado. Actualmente grupos de investigación de enfermería han desarrollado líneas de investigación específicas para investigaren proceso de enfermería y en los diagnósticos de enfermería. (Rev Cuid 2010;1(1:63-72.Palabras clave: Investigación, Procesos de Enfermería, Diagnóstico de Enfermería, Estudios de Validación. (Fuente: DeCS BIREME. 

Synchronizing Strategies under Partial Observability

DEFF Research Database (Denmark)

Larsen, Kim Guldstrand; Laursen, Simon; Srba, Jiri

2014-01-01

Embedded devices usually share only partial information about their current configurations as the communication bandwidth can be restricted. Despite this, we may wish to bring a failed device into a given predetermined configuration. This problem, also known as resetting or synchronizing words, has...... been intensively studied for systems that do not provide any information about their configurations. In order to capture more general scenarios, we extend the existing theory of synchronizing words to synchronizing strategies, and study the synchronization, short-synchronization and subset...

Biologically Inspired Intercellular Slot Synchronization

Directory of Open Access Journals (Sweden)

Alexander Tyrrell

2009-01-01

Full Text Available The present article develops a decentralized interbase station slot synchronization algorithm suitable for cellular mobile communication systems. The proposed cellular firefly synchronization (CelFSync algorithm is derived from the theory of pulse-coupled oscillators, common to describe synchronization phenomena in biological systems, such as the spontaneous synchronization of fireflies. In order to maintain synchronization among base stations (BSs, even when there is no direct link between adjacent BSs, some selected user terminals (UTs participate in the network synchronization process. Synchronization emerges by exchanging two distinct synchronization words, one transmitted by BSs and the other by active UTs, without any a priori assumption on the initial timing misalignments of BSs and UTs. In large-scale networks with inter-BS site distances up to a few kilometers, propagation delays severely affect the attainable timing accuracy of CelFSync. We show that by an appropriate combination of CelFSync with the timing advance procedure, which aligns uplink transmission of UTs to arrive simultaneously at the BS, a timing accuracy within a fraction of the inter-BS propagation delay is retained.

Diagnósticos de enfermagem de pacientes hospitalizados com doenças cardiovasculares Diagnósticos de enfermería para pacientes hospitalizados com enfermedades cardiovasculares Nursing diagnoses for inpatients with cardiovascular diseases

Directory of Open Access Journals (Sweden)

Juliana de Melo Vellozo Pereira

2011-12-01

fueron: ansiedad (76,7%, dolor agudo (70,7%, disminución del gasto cardiaco (56,7%, percepción sensorial perturbada - visual (53,3%, insomnio (46,7%, intolerancia a la actividad (36,7%, disfunción sexual (36,7%, y eliminación urinaria perjudicada (36,7%. Conclusión: la descripción de los diagnósticos de enfermería contribuyó para el análisis de las respuestas a la enfermedad cardiovascular, enfocado en el objeto de trabajo del enfermero. Los diagnósticos de enfermería presentan respuestas a la enfermedad cardiovascular a través de investigación holística.To identify the frequency of nursing diagnoses defining characteristics of inpatients with cardiovascular disease, and to rate them according to demographic and clinical variables. Methods: A descriptive transversal study. Data were collected through nursing assessment, medical charts, interview and physical exams with 30 inpatients in a large hospital .A proprietary instrument validated for data collection was used. Such data were analyzed by 5 experts and, upon agreement of 50%, they were submitted to descriptive and inferential statistical analysis. Results: Significant associations were found with the factors Presence of Heart Failure, Acute Myocardial Infarction, Pain, Sex and Age. The most frequent nursing diagnoses were: anxiety (76,7%, acute pain (70,7%, decreased cardiac output (56,7%, activity intolerance (46,7%, sexual dysfunction (36,7% and impaired urinary elimination (36,7%. The diagnosis decreased cardiac output, impaired activity and impaired urinary elimination (p=0,029 were observed with high frequency in patients with heart failure (p=0,003. There was also an association between acute myocardial infarction and insomnia nursing diagnosis (p=0,014. Sexual dysfunction was associated with age above 60 years (p=0,041. Conclusion: nursing diagnoses showed responses to cardiovascular disease through holistic research.

Exploiting Schemas in Data Synchronization

DEFF Research Database (Denmark)

Foster, J. Nathan; Greenwald, Michael B.; Kirkegaard, Christian

2005-01-01

Increased reliance on optimistic data replication has led to burgeoning interest in tools and frameworks for disconnected updates to replicated data.We have implemented a generic synchronization framework, called HARMONY, that can be used to build state-based synchronizers for a wide variety...... of tree-structureddata formats. A novel feature of this framework is that the synchronization process - in particular, the recognition of conflicts - is driven by the schema of the structures being synchronized.We formalize HARMONY's synchronization algorithm, state a simple and intuitive specification......, and illustrate, using simple address books as a case study, how it can be used to synchronize trees representing a variety of specific forms of applicationdata, including sets, records, tuples, and relations....

Pinning synchronization of a mobile agent network

International Nuclear Information System (INIS)

Wang, Lei; Sun, You-xian

2009-01-01

We investigate the problem of controlling a group of mobile agents in a plane in order to move them towards a desired orbit via pinning control, in which each agent is associated with a chaotic oscillator coupled with those of neighboring agents, and the pinning strategy is to have the common linear feedback acting on a small fraction of agents by random selection. We explore the effects of the pinning probability, feedback gains and agent density in the pinning synchronization of a mobile agent network under a fast-switching constraint, and perform numerical simulations for validation. In particular, we show that there exists a critical pinning density for network synchronization with an unbounded region: above the threshold, the dynamical network can be controlled by pinning; below it, anarchy prevails. And for the network with a single bounded synchronization region, pinning control has little effect as regards enhancing network synchronizability

Ultrasonido transcraneal en el diagnóstico del Parkinson

Directory of Open Access Journals (Sweden)

Aniley Martínez González

2014-10-01

Full Text Available La enfermedad de Parkinson es la segunda enfermedad neurodegenerativa más común, y al tratarse de una patología asociada al envejecimiento, las probabilidades de adquirir la enfermedad aumentan con la edad. El diagnóstico de la enfermedad de Parkinson idiopática está basado en criterios clínicos, no obstante, su diferenciación con otros tipos de parkinsonismos puede ser difícil, especialmente en estadios tempranos de la enfermedad. El ultrasonido transcraneal ha llegado como una herramienta para el diagnóstico de esta patología, con gran utilidad en su determinación precoz. El hallazgo ultrasonográfico característico de esta entidad es el aumento de la ecogenicidad de la sustancia negra mesencefálica, medida a través de la ventana ósea temporal. En el presente artículo se analiza la utilidad del ultrasonido transcraneal para el diagnóstico precoz de los pacientes con enfermedad de Parkinson.

Efectos estigmatizantes del diagnóstico psicológico en niños

Directory of Open Access Journals (Sweden)

Mª del Mar Montoya-Rodríguez

2017-04-01

Full Text Available A pesar de las ventajas conocidas de la clasificación de trastornos psicológicos, utilizar diagnósticos formales entraña el riesgo de reducir una historia de vida y modo de comportarse a una mera etiqueta diagnóstica, volviéndose una explicación tautológica que obvia la verdadera explicación del problema y añade funciones iatrogénicas y estigmatizantes. Se realiza un estudio para valorar la influencia de las etiquetas diagnósticas en la actuación de Psicólogos que evalúan la inteligencia de un grupo de niños mediante el Test de Goodenough. Diferentes dibujos de una figura humana, realizados por niños con desarrollo normalizado, fueron etiquetados como si hubieran sido dibujados por niños con retraso mental, altas capacidades y autismo. Los resultados muestran que los evaluadores, desconocedores de la falsedad diagnóstica, puntúan los dibujos diferencialmente según la etiqueta utilizada. Esto es, los resultados apoyan la influencia negativa de las etiquetas diagnósticas en las expectativas y trato hacia la persona diagnosticada.

Asynchronized synchronous machines

CERN Document Server

Botvinnik, M M

1964-01-01

Asynchronized Synchronous Machines focuses on the theoretical research on asynchronized synchronous (AS) machines, which are "hybrids” of synchronous and induction machines that can operate with slip. Topics covered in this book include the initial equations; vector diagram of an AS machine; regulation in cases of deviation from the law of full compensation; parameters of the excitation system; and schematic diagram of an excitation regulator. The possible applications of AS machines and its calculations in certain cases are also discussed. This publication is beneficial for students and indiv

Caso para Diagnóstico Case for Diagnosis

Directory of Open Access Journals (Sweden)

Hélio Amante Miot

2007-10-01

Full Text Available Descreve-se caso clínico de paciente do sexo masculino, jovem, imunocompetente, portador de melanoníquia fúngica no terceiro pododáctilo causado por Scytalidium dimidiatum. Discutem-se a semiotécnica diagnóstica, seus diferenciais e a terapêutica adequada. Os autores destacam que a etiologia fúngica deva ser considerada no diagnóstico das melanoníquias.The authors report the case of a young, immunocompetent male, affected by fungal melanonychia in the third toe, caused by Scytalidium dimidiatum. The Diagnostic procedures, the differential diagnosis and adequate treatment are also discussed. The authors remark that a fungal etiology should be considered in the diagnosis of melanonychia.

Painleve-Gullstrand synchronizations in spherical symmetry

International Nuclear Information System (INIS)

Herrero, Alicia; Morales-Lladosa, Juan Antonio

2010-01-01

A Painleve-Gullstrand synchronization is a slicing of the spacetime by a family of flat space-like 3-surfaces. For spherically symmetric spacetimes, we show that a Painleve-Gullstrand synchronization only exists in the region where (dr) 2 ≤ 1, r being the curvature radius of the isometry group orbits (2-spheres). This condition states that the Misner-Sharp gravitational energy of these 2-spheres is not negative and has an intrinsic meaning in terms of the norm of the mean extrinsic curvature vector. It also provides an algebraic inequality involving the Weyl curvature scalar and the Ricci eigenvalues. We prove that the energy and momentum densities associated with the Weinberg complex of a Painleve-Gullstrand slice vanish in these curvature coordinates, and we give a new interpretation of these slices by using semi-metric Newtonian connections. It is also outlined that, by solving the vacuum Einstein's equations in a coordinate system adapted to a Painleve-Gullstrand synchronization, the Schwarzschild solution is directly obtained in a whole coordinate domain that includes the horizon and both its interior and exterior regions.

Control of non-conventional synchronous motors

CERN Document Server

Louis, Jean-Paul

2013-01-01

Classical synchronous motors are the most effective device to drive industrial production systems and robots with precision and rapidity. However, numerous applications require efficient controls in non-conventional situations. Firstly, this is the case with synchronous motors supplied by thyristor line-commutated inverters, or with synchronous motors with faults on one or several phases. Secondly, many drive systems use non-conventional motors such as polyphase (more than three phases) synchronous motors, synchronous motors with double excitation, permanent magnet linear synchronous motors,

Anti-synchronization of chaotic oscillators

International Nuclear Information System (INIS)

Kim, Chil-Min; Rim, Sunghwan; Kye, Won-Ho; Ryu, Jung-Wan; Park, Young-Jai

2003-01-01

We have observed anti-synchronization phenomena in coupled identical chaotic oscillators. Anti-synchronization can be characterized by the vanishing of the sum of relevant variables. We have qualitatively analyzed its base mechanism by using the dynamics of the difference and the sum of the relevant variables in coupled chaotic oscillators. Near the threshold of the synchronization and anti-synchronization transition, we have obtained the novel characteristic relation

El diagnóstico positivo de autismo infantil

Directory of Open Access Journals (Sweden)

Juana Velázquez Argota

1996-08-01

Full Text Available Se revisan los límites del síndrome autístico y la evolución del concepto de autismo infantil desde Kanner hasta las clasificaciones psiquiátricas más recientes. Se informan los resultados de nuestras investigaciones en el diagnóstico positivo del autismo infantil. La anamnesis remota es de poco valor, más relevantes para el diagnóstico constituyen el examen del paciente en el presente y las escalas de cuantificación del autismo (las cuales son de utilidad en el diagnóstico diferencial entre el trastorno autístico tipo Kanner y los trastornos autísticos atípicos. Las pruebas de inteligencia standard se deben aplicar según el nivel de funcionamiento del paciente y si no clasificara es más bien por el bajo cociente de inteligencia que por su comportamiento autístico. El clínico debería tener presente la posibilidad del diagnóstico de autismo cuando examina niños pequeños con problemas de desarrollo y utilizar escalas de síntomas autísticos adecuados a los primeros años de vida. Se recomienda el uso de la prueba de Bo Olsson en el diagnóstico diferencial de autismo de Kanner, síndrome de Rett y daño cerebral temprano en la etapa preescolar.The limits of the austistic syndrome as well as the evolution of the infantile autism concept since Kanner to the latest psychiatric classifications are reviewed. The results of our research on the positive diagnosis of infantile autism are reported. The patient's medical examination and the autism quantification scales (useful for the diferential diagnosis between the Kanner type autistic disorder and the atypical autistic disorders are more important for the diagnosis than the remote anamnesis, which is of little value. The standard intelligence test should be applied according to the patients functioning level and if he would not classify it would be because of his low intelligence quotient and not because of his autistic behaviour. The clinician should take into account the

Psilocybin-induced spiritual experiences and insightfulness are associated with synchronization of neuronal oscillations.

Science.gov (United States)

Kometer, Michael; Pokorny, Thomas; Seifritz, Erich; Volleinweider, Franz X

2015-10-01

During the last years, considerable progress has been made toward understanding the neuronal basis of consciousness by using sophisticated behavioral tasks, brain-imaging techniques, and various psychoactive drugs. Nevertheless, the neuronal mechanisms underlying some of the most intriguing states of consciousness, including spiritual experiences, remain unknown. To elucidate state of consciousness-related neuronal mechanisms, human subjects were given psilocybin, a naturally occurring serotonergic agonist and hallucinogen that has been used for centuries to induce spiritual experiences in religious and medical rituals. In this double-blind, placebo-controlled study, 50 healthy human volunteers received a moderate dose of psilocybin, while high-density electroencephalogram (EEG) recordings were taken during eyes-open and eyes-closed resting states. The current source density and the lagged phase synchronization of neuronal oscillations across distributed brain regions were computed and correlated with psilocybin-induced altered states of consciousness. Psilocybin decreased the current source density of neuronal oscillations at 1.5-20 Hz within a neural network comprising the anterior and posterior cingulate cortices and the parahippocampal regions. Most intriguingly, the intensity levels of psilocybin-induced spiritual experience and insightfulness correlated with the lagged phase synchronization of delta oscillations (1.5-4 Hz) between the retrosplenial cortex, the parahippocampus, and the lateral orbitofrontal area. These results provide systematic evidence for the direct association of a specific spatiotemporal neuronal mechanism with spiritual experiences and enhanced insight into life and existence. The identified mechanism may constitute a pathway for modulating mental health, as spiritual experiences can promote sustained well-being and psychological resilience.

Coexistence and switching of anticipating synchronization and lag synchronization in an optical system

International Nuclear Information System (INIS)

Wu, Liang; Zhu, Shiqun

2003-01-01

The chaotic synchronization between two bi-directionally coupled external cavity single-mode semiconductor lasers is investigated. Numerical simulation shows that anticipating synchronization and lag synchronization coexist and switch between each other in certain parameter regime. The anticipating time with different effects that were discussed quite differently in the previous theoretical analysis and experimental observation is determined by the involved parameters in the system

Adaptive Backoff Synchronization Techniques

Science.gov (United States)

1989-07-01

Percentage of synchronization and non- synchronisation references that cause invalidations in directory schemes with 2, 3, 4, 5, and 64 pointers...processors to arrive. The slight relative increase of synchronisation overhead in all cases when going from two to five pointers is because synchronization ...MASSACHUSETTS INSTITUTE OF TECHNOLOGY VLSI PUBLICATIONS q~JU VLSI Memo No. 89-547 It July 1989 Adaptive Backoff Synchronization Techniques Anant

Synchronicity and Leadership

NARCIS (Netherlands)

Merry, Philip

2017-01-01

LAY SUMMARY SYNCHRONICITY AND LEADERSHIP TILBURG PHD DISSERTATION, PHILIP MERRY World’s First PhD to Research Synchronicity And Leadership Using Grounded Theory OUT OF THE BLUE COINCIDENCES: research topic Most people have had the experience of thinking of someone and then, almost magically have

Synchronous implementation of optoelectronic NOR and XNOR logic gates using parallel synchronization of three chaotic lasers

International Nuclear Information System (INIS)

Yan Sen-Lin

2014-01-01

The parallel synchronization of three chaotic lasers is used to emulate optoelectronic logic NOR and XNOR gates via modulating the light and the current. We deduce a logical computational equation that governs the chaotic synchronization, logical input, and logical output. We construct fundamental gates based on the three chaotic lasers and define the computational principle depending on the parallel synchronization. The logic gate can be implemented by appropriately synchronizing two chaotic lasers. The system shows practicability and flexibility because it can emulate synchronously an XNOR gate, two NOR gates, and so on. The synchronization can still be deteceted when mismatches exist with a certain range. (general)

Instructor's guide : - synchronized skating school

OpenAIRE

Mokkila, Eveliina

2011-01-01

The starting point to the Instructor’s guide for synchronized skating school was the situation that Turun Riennon Taitoluistelu figure skating club constantly struggles to get enough skaters to the Beginner team in synchronized skating. The guidebook was written to guide the skating school instructors towards providing more synchronized skating teaching in their lessons. As a result from introducing synchronized skating more in the skating school, it is expected to have more children conti...

Symbol synchronization and sampling frequency synchronization techniques in real-time DDO-OFDM systems

Science.gov (United States)

Chen, Ming; He, Jing; Cao, Zizheng; Tang, Jin; Chen, Lin; Wu, Xian

2014-09-01

In this paper, we propose and experimentally demonstrate a symbol synchronization and sampling frequency synchronization techniques in real-time direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system, over 100-km standard single mode fiber (SSMF) using a cost-effective directly modulated distributed feedback (DFB) laser. The experiment results show that the proposed symbol synchronization based on training sequence (TS) has a low complexity and high accuracy even at a sampling frequency offset (SFO) of 5000-ppm. Meanwhile, the proposed pilot-assisted sampling frequency synchronization between digital-to-analog converter (DAC) and analog-to-digital converter (ADC) is capable of estimating SFOs with an accuracy of technique can also compensate SFO effects within a small residual SFO caused by deviation of SFO estimation and low-precision or unstable clock source. The two synchronization techniques are suitable for high-speed DDO-OFDM transmission systems.

Enhancing Time Synchronization Support in Wireless Sensor Networks.

Science.gov (United States)

Tavares Bruscato, Leandro; Heimfarth, Tales; Pignaton de Freitas, Edison

2017-12-20

With the emerging Internet of Things (IoT) technology becoming reality, a number of applications are being proposed. Several of these applications are highly dependent on wireless sensor networks (WSN) to acquire data from the surrounding environment. In order to be really useful for most of applications, the acquired data must be coherent in terms of the time in which they are acquired, which implies that the entire sensor network presents a certain level of time synchronization. Moreover, to efficiently exchange and forward data, many communication protocols used in WSN rely also on time synchronization among the sensor nodes. Observing the importance in complying with this need for time synchronization, this work focuses on the second synchronization problem, proposing, implementing and testing a time synchronization service for low-power WSN using low frequency real-time clocks in each node. To implement this service, three algorithms based on different strategies are proposed: one based on an auto-correction approach, the second based on a prediction mechanism, while the third uses an analytical correction mechanism. Their goal is the same, i.e., to make the clocks of the sensor nodes converge as quickly as possible and then to keep them most similar as possible. This goal comes along with the requirement to keep low energy consumption. Differently from other works in the literature, the proposal here is independent of any specific protocol, i.e., it may be adapted to be used in different protocols. Moreover, it explores the minimum number of synchronization messages by means of a smart clock update strategy, allowing the trade-off between the desired level of synchronization and the associated energy consumption. Experimental results, which includes data acquired from simulations and testbed deployments, provide evidence of the success in meeting this goal, as well as providing means to compare these three approaches considering the best synchronization

Enhancing Time Synchronization Support in Wireless Sensor Networks

Science.gov (United States)

Tavares Bruscato, Leandro; Heimfarth, Tales; Pignaton de Freitas, Edison

2017-01-01

With the emerging Internet of Things (IoT) technology becoming reality, a number of applications are being proposed. Several of these applications are highly dependent on wireless sensor networks (WSN) to acquire data from the surrounding environment. In order to be really useful for most of applications, the acquired data must be coherent in terms of the time in which they are acquired, which implies that the entire sensor network presents a certain level of time synchronization. Moreover, to efficiently exchange and forward data, many communication protocols used in WSN rely also on time synchronization among the sensor nodes. Observing the importance in complying with this need for time synchronization, this work focuses on the second synchronization problem, proposing, implementing and testing a time synchronization service for low-power WSN using low frequency real-time clocks in each node. To implement this service, three algorithms based on different strategies are proposed: one based on an auto-correction approach, the second based on a prediction mechanism, while the third uses an analytical correction mechanism. Their goal is the same, i.e., to make the clocks of the sensor nodes converge as quickly as possible and then to keep them most similar as possible. This goal comes along with the requirement to keep low energy consumption. Differently from other works in the literature, the proposal here is independent of any specific protocol, i.e., it may be adapted to be used in different protocols. Moreover, it explores the minimum number of synchronization messages by means of a smart clock update strategy, allowing the trade-off between the desired level of synchronization and the associated energy consumption. Experimental results, which includes data acquired from simulations and testbed deployments, provide evidence of the success in meeting this goal, as well as providing means to compare these three approaches considering the best synchronization

Diagnóstico molecular de Mycobacterium tuberculosis en biopsias pleurales embebidas en parafina

Directory of Open Access Journals (Sweden)

Helí Barrón

2006-03-01

Full Text Available Objetivo: Determinar la sensibilidad de la prueba de reacción en cadena de la polimerasa (TB-PCR frente a la tinción de fluorocromo auramina (AFB-auramina en muestras histológicas de biopsias pleurales embebidas en parafina, en el diagnóstico de tuberculosis pleural. Materiales y Métodos: Se usó 48 bloques de parafina obtenidos de los archivos de Patología del Hospital San José del Callao y del Instituto Nacional de Enfermedades Neoplásicas, 30 de los cuales tenían diagnóstico clínico de tuberculosis y 18 presentaron diagnóstico diferente de tuberculosis. Resultados: De los 30 casos con diagnóstico clínico de tuberculosis, 29 resultaron ser TB-PCR positivos. Los 18 casos negativos para tuberculosis resultaron también negativos para TB-PCR. La sensibilidad y el valor predictivo negativo para TB-PCR fueron 96,7% y 94,7%. La sensibilidad y el valor predictivo negativo para AFB-auramina fueron 58,6% y 56,7%. En ambos casos, el valor predictivo positivo fue de 100%. Conclusión: TB-PCR ha resultado ser un método muy sensible en el diagnóstico de tuberculosis en muestras histológicas embebidas en parafina.

Synchronization of Concurrent Processes

Science.gov (United States)

1975-07-01

Pettersen Stanford Ur.iversity Artificial Intelligence Laboratory ABSTRACT Th oaoer gives an overview of commonly used synchronization primitives and...wr.ters . ut.l.z.ng the DroDo4d synchronization primitive . The solution is simpler and shorter than other known S’ms The first sections of the paper...un reicr»» side il nrcttaary and Identity by block number) Scheduling, process scheduling, synchronization , mutual exclusion, semaphores , critical

Long-term relationships between cholinergic tone, synchronous bursting and synaptic remodeling.

Directory of Open Access Journals (Sweden)

Maya Kaufman

Full Text Available Cholinergic neuromodulation plays key roles in the regulation of neuronal excitability, network activity, arousal, and behavior. On longer time scales, cholinergic systems play essential roles in cortical development, maturation, and plasticity. Presumably, these processes are associated with substantial synaptic remodeling, yet to date, long-term relationships between cholinergic tone and synaptic remodeling remain largely unknown. Here we used automated microscopy combined with multielectrode array recordings to study long-term relationships between cholinergic tone, excitatory synapse remodeling, and network activity characteristics in networks of cortical neurons grown on multielectrode array substrates. Experimental elevations of cholinergic tone led to the abrupt suppression of episodic synchronous bursting activity (but not of general activity, followed by a gradual growth of excitatory synapses over hours. Subsequent blockage of cholinergic receptors led to an immediate restoration of synchronous bursting and the gradual reversal of synaptic growth. Neither synaptic growth nor downsizing was governed by multiplicative scaling rules. Instead, these occurred in a subset of synapses, irrespective of initial synaptic size. Synaptic growth seemed to depend on intrinsic network activity, but not on the degree to which bursting was suppressed. Intriguingly, sustained elevations of cholinergic tone were associated with a gradual recovery of synchronous bursting but not with a reversal of synaptic growth. These findings show that cholinergic tone can strongly affect synaptic remodeling and synchronous bursting activity, but do not support a strict coupling between the two. Finally, the reemergence of synchronous bursting in the presence of elevated cholinergic tone indicates that the capacity of cholinergic neuromodulation to indefinitely suppress synchronous bursting might be inherently limited.

Long-term Relationships between Cholinergic Tone, Synchronous Bursting and Synaptic Remodeling

Science.gov (United States)

Kaufman, Maya; Corner, Michael A.; Ziv, Noam E.

2012-01-01

Cholinergic neuromodulation plays key roles in the regulation of neuronal excitability, network activity, arousal, and behavior. On longer time scales, cholinergic systems play essential roles in cortical development, maturation, and plasticity. Presumably, these processes are associated with substantial synaptic remodeling, yet to date, long-term relationships between cholinergic tone and synaptic remodeling remain largely unknown. Here we used automated microscopy combined with multielectrode array recordings to study long-term relationships between cholinergic tone, excitatory synapse remodeling, and network activity characteristics in networks of cortical neurons grown on multielectrode array substrates. Experimental elevations of cholinergic tone led to the abrupt suppression of episodic synchronous bursting activity (but not of general activity), followed by a gradual growth of excitatory synapses over hours. Subsequent blockage of cholinergic receptors led to an immediate restoration of synchronous bursting and the gradual reversal of synaptic growth. Neither synaptic growth nor downsizing was governed by multiplicative scaling rules. Instead, these occurred in a subset of synapses, irrespective of initial synaptic size. Synaptic growth seemed to depend on intrinsic network activity, but not on the degree to which bursting was suppressed. Intriguingly, sustained elevations of cholinergic tone were associated with a gradual recovery of synchronous bursting but not with a reversal of synaptic growth. These findings show that cholinergic tone can strongly affect synaptic remodeling and synchronous bursting activity, but do not support a strict coupling between the two. Finally, the reemergence of synchronous bursting in the presence of elevated cholinergic tone indicates that the capacity of cholinergic neuromodulation to indefinitely suppress synchronous bursting might be inherently limited. PMID:22911726

Long-term relationships between cholinergic tone, synchronous bursting and synaptic remodeling.

Science.gov (United States)

Kaufman, Maya; Corner, Michael A; Ziv, Noam E

2012-01-01

Cholinergic neuromodulation plays key roles in the regulation of neuronal excitability, network activity, arousal, and behavior. On longer time scales, cholinergic systems play essential roles in cortical development, maturation, and plasticity. Presumably, these processes are associated with substantial synaptic remodeling, yet to date, long-term relationships between cholinergic tone and synaptic remodeling remain largely unknown. Here we used automated microscopy combined with multielectrode array recordings to study long-term relationships between cholinergic tone, excitatory synapse remodeling, and network activity characteristics in networks of cortical neurons grown on multielectrode array substrates. Experimental elevations of cholinergic tone led to the abrupt suppression of episodic synchronous bursting activity (but not of general activity), followed by a gradual growth of excitatory synapses over hours. Subsequent blockage of cholinergic receptors led to an immediate restoration of synchronous bursting and the gradual reversal of synaptic growth. Neither synaptic growth nor downsizing was governed by multiplicative scaling rules. Instead, these occurred in a subset of synapses, irrespective of initial synaptic size. Synaptic growth seemed to depend on intrinsic network activity, but not on the degree to which bursting was suppressed. Intriguingly, sustained elevations of cholinergic tone were associated with a gradual recovery of synchronous bursting but not with a reversal of synaptic growth. These findings show that cholinergic tone can strongly affect synaptic remodeling and synchronous bursting activity, but do not support a strict coupling between the two. Finally, the reemergence of synchronous bursting in the presence of elevated cholinergic tone indicates that the capacity of cholinergic neuromodulation to indefinitely suppress synchronous bursting might be inherently limited.

Li-Yorke chaos and synchronous chaos in a globally nonlocal coupled map lattice

International Nuclear Information System (INIS)

Khellat, Farhad; Ghaderi, Akashe; Vasegh, Nastaran

2011-01-01

Highlights: → A globally nonlocal coupled map lattice is introduced. → A sufficient condition for the existence of Li-Yorke chaos is determined. → A sufficient condition for synchronous behaviors is obtained. - Abstract: This paper investigates a globally nonlocal coupled map lattice. A rigorous proof to the existence of chaos in the scene of Li-Yorke in that system is presented in terms of the Marotto theorem. Analytical sufficient conditions under which the system is chaotic, and has synchronous behaviors are determined, respectively. The wider regions associated with chaos and synchronous behaviors are shown by simulations. Spatiotemporal chaos, synchronous chaos and some other synchronous behaviors such as fixed points, 2-cycles and 2 2 -cycles are also shown by simulations for some values of the parameters.

Distrofia neuroaxonal infantil: diagnóstico em vida por biopsia conjuntival

Directory of Open Access Journals (Sweden)

S. Rosemberg

1985-03-01

Full Text Available São relatados três casos de distrofia neuroaxonal infantil cujo diagnóstico foi feito mediante o estudo ultrastrutural de biópsia da conjuntiva. Nesta, algumas fibras nervosas amielínicas e, mais raramente, as mielínicas, mostravam, no axoplasma, agregados densos membrano-tubulares, idênticos aos dos esferóides ocorrentes no SNC nesta doença. O achado destas estruturas é o único meio diagnóstico em vida. A biópsia da conjuntiva, pela facilidade de sua execução e por sua inocuidade, é o procedimento preferido para este estudo. Clinicamente, a enorme hipotonia aliada a sinais piramidais, a ausência de crises convulsivas, a atrofia cerebelar visível à tomografia e o modo evolutivo, sugerem fortemente o diagnóstico de distrofia neuroaxonal infantil.

Diagnóstico precoz de enfermedades pulmonares por tabaquismo

Directory of Open Access Journals (Sweden)

Dr. D. Rodrigo Gil

2010-09-01

Full Text Available El tabaquismo es una epidemia y en Chile la prevalencia no ha disminuido. Entre las causas más importantes de muerte por tabaquismo están el cáncer pulmonar y la enfermedad pulmonar obstructiva crónica (EPOC. La erradicación del tabaquismo es la mejor estrategia de prevención de estas enfermedades. La segunda estrategia es la detección precoz de ellas. Sin embargo la EPOC está sub diagnosticada en todo el mundo. No está claro si la solución es hacer más espirometrías en población de riesgo. Es posible que otros métodos diagnósticos como la tomografía axial computada de tórax (TAC y la difusión pulmonar, puedan mejorar la capacidad de diagnóstico precoz de esta enfermedad. El cáncer pulmonar es el más mortal de los cánceres. El diagnóstico en etapas tempranas mejora significativamente su pronóstico. Hay varios estudios en curso que evalúan el beneficio de hacer pesquisa de cáncer pulmonar con TAC.

Unidirectional synchronization of Hodgkin-Huxley neurons

Energy Technology Data Exchange (ETDEWEB)

Cornejo-Perez, Octavio [Division de Matematicas Aplicadas y Sistemas, Computacionales, IPICYT, Apdo. Postal 3-74 Tangamanga, 78231 San Luis Potosi (Mexico)]. E-mail: octavio@ipicyt.edu.mx; Femat, Ricardo [Division de Matematicas Aplicadas y Sistemas, Computacionales, IPICYT, Apdo. Postal 3-74 Tangamanga, 78231 San Luis Potosi (Mexico)]. E-mail: rfemat@ipicyt.edu.mx

2005-07-01

Synchronization dynamics of two noiseless Hodgkin-Huxley (HH) neurons under the action of feedback control is studied. The spiking patterns of the action potentials evoked by periodic external modulations attain synchronization states under the feedback action. Numerical simulations for the synchronization dynamics of regular-irregular desynchronized spiking sequences are displayed. The results are discussed in context of generalized synchronization. It is also shown that the HH neurons can be synchronized in face of unmeasured states.

Hybrid synchronization of hyperchaotic Lu system

Indian Academy of Sciences (India)

In this paper, we study the hybrid synchronization between two identical hyperchaotic Lu systems. Hybrid synchronization of hyperchaotic Lu system is achieved through synchronization of two pairs of states and anti-synchronization of the other two pairs of states. Active controls are designed to achieve hybrid ...

Adaptive Synchronization of Chaotic Systems considering Performance Parameters of Operational Amplifiers

Directory of Open Access Journals (Sweden)

Sergio Ruíz-Hernández

2015-01-01

Full Text Available This paper addresses an adaptive control approach for synchronizing two chaotic oscillators with saturated nonlinear function series as nonlinear functions. Mathematical models to characterize the behavior of the transmitter and receiver circuit were derived, including in the latter the adaptive control and taking into account, for both chaotic oscillators, the most influential performance parameters associated with operational amplifiers. Asymptotic stability of the full synchronization system is studied by using Lyapunov direct method. Theoretical derivations and related results are experimentally validated through implementations from commercially available devices. Finally, the full synchronization system can easily be reproducible at a low cost.

Estudo multicêntrico da época do diagnóstico de fendas orais

Directory of Open Access Journals (Sweden)

Lívia G Amstalden-Mendes

2011-06-01

Full Text Available OBJETIVO: Determinar a época do diagnóstico de fendas orofaciais típicas em diferentes regiões brasileiras e sua influência na idade da correção cirúrgica. MÉTODO: Estudo prospectivo, descritivo e transversal realizado em centros médicos do Sudeste, Sul e Nordeste do Brasil. Fonoaudiólogos e geneticistas treinados realizaram entrevista, previamente validada, com pais de crianças afetadas. Utilizaram-se os programas Epi-Info e SPSS. Adotou-se nível de significância de 5% (p < 0,05. RESULTADOS: A amostra contou com 215 entrevistas para análise: 21,9% (47 aplicadas no Sudeste, 51,1% (110 no Sul e 27% (58 no Nordeste. A renda mensal no Sudeste foi maior (p < 0,05. A fenda labiopalatal foi encontrada em 61,4% (132 dos casos, a palatal, em 20,9% (45, e a labial, em 17,7% (38. Em 75,3% (162 dos casos, o diagnóstico ocorreu na maternidade, em 14% (30, no pré-natal e, em 10,2% (22, após a alta da maternidade. O Sudeste apresentou maior frequência de diagnóstico pré-natal (27,7%, possivelmente relacionada ao maior poder aquisitivo e a oportunidades de investigação. Dos diagnósticos em maternidades, 74,4% ocorreram no Nordeste. Entretanto, não houve diferença na comparação entre época de diagnóstico, região e idade da primeira cirurgia. CONCLUSÃO: Considerando que o diagnóstico é mais frequente em maternidades, sugere-se o treinamento das equipes de saúde desses locais, visando efetiva coordenação do atendimento inicial. Apesar da época do diagnóstico não influenciar a idade das cirurgias, ela favorece o planejamento dos cuidados neonatais e terapêuticos dos afetados.

Tricotilomania: dificuldades diagnósticas e relato de dois casos

OpenAIRE

Lima,Maria Cristina P.; Trench,Érica Vasques; Rodrigues,Louise Lopes; Dantas,Lidiane Affonso de S.; Lovadini,Gustavo Bigaton; Torres,Albina Rodrigues

2010-01-01

OBJETIVO: Relatar dois casos de tricotilomania, um transtorno psiquiátrico ainda subdiagnosticado e que pode estar associado a problemas sociais e clínicos relevantes. Pretende-se destacar as características clínicas, discutindo as implicações do diagnóstico precoce para a evolução dos pacientes. DESCRIÇÃO DO CASO: Uma adolescente com diagnóstico de tricotilomania "pura" e outra menina cujo quadro estava associado ao transtorno obsessivo-compulsivo. Embora com o tratamento, a evolução de amba...

Breaking projective chaos synchronization secure communication using filtering and generalized synchronization

International Nuclear Information System (INIS)

Alvarez, G.; Li Shujun; Montoya, F.; Pastor, G.; Romera, M.

2005-01-01

This paper describes the security weaknesses of a recently proposed secure communication method based on chaotic masking using projective synchronization of two chaotic systems. We show that the system is insecure and how to break it in two different ways, by high-pass filtering and by generalized synchronization

Fault-tolerant clock synchronization in distributed systems

Science.gov (United States)

Ramanathan, Parameswaran; Shin, Kang G.; Butler, Ricky W.

1990-01-01

Existing fault-tolerant clock synchronization algorithms are compared and contrasted. These include the following: software synchronization algorithms, such as convergence-averaging, convergence-nonaveraging, and consistency algorithms, as well as probabilistic synchronization; hardware synchronization algorithms; and hybrid synchronization. The worst-case clock skews guaranteed by representative algorithms are compared, along with other important aspects such as time, message, and cost overhead imposed by the algorithms. More recent developments such as hardware-assisted software synchronization and algorithms for synchronizing large, partially connected distributed systems are especially emphasized.

Demencias: su enfoque diagnóstico Dementias: their diagnostic approach

Directory of Open Access Journals (Sweden)

Víctor T. Pérez Martínez

2006-12-01

Full Text Available La reducción de la capacidad cognitiva es esencial para el diagnóstico de demencia. La secuencia diagnóstica incluye la evaluación clínica (neurológica y psicopatológica, la evaluación neuropsicológica y la evaluación familiar. El equipo de salud debe estar capacitado para abordar la demencia, desde su diagnóstico precoz, hasta el plan de actuación individualizado para cada paciente y cuidador. La mayor influencia en el diagnóstico temprano dependerá de la preparación y actualización del equipo de Atención Primaria de Salud. La implicación real de la Atención Primaria en la detección y tratamiento efectivo de los problemas cognitivos en general es escasa, pero es innegable que las crecientes necesidades de la población que envejece le otorgan un papel de vanguardia a este nivel asistencial. En nuestro medio la exploración del estado mental no constituye una práctica sistemática, y persiste un grado no despreciable de subregistro para dicho diagnóstico.The reduction of the cognitive capacity is essential for the diagnosis of dementia. The diagnostic sequence includes the cllinical evaluation (neurological and psychopathological, the neuropsychological assessment and the family evaluation. The health team should be trained to deal with dementia from its early diagnosis to the action plan individualized for each patient and health care provider. The highest influence on the early diagnosis will depend on the training and updating of the Primary Health Care team. The real involvement of Primary Care in the detection and effective treatment of the cognitive problems in general is scarce, but it is undeniable that the growing needs of the aging population grant a role of avanguard to this health care level. In our context, the exploration of the mental state is not a systematic practice, and there is a degree of subregister for this diagnosis that should not be discarded.

International business cycle synchronization since the 1870s: Evidence from a novel network approach

Science.gov (United States)

Antonakakis, Nikolaos; Gogas, Periklis; Papadimitriou, Theophilos; Sarantitis, Georgios Antonios

2016-04-01

In this study, we examine the issue of business cycle synchronization from a historical perspective in 27 developed and developing countries. Based on a novel complex network approach, the Threshold-Minimum Dominating Set (T-MDS), our results reveal heterogeneous patterns of international business cycle synchronization during fundamental globalization periods since the 1870s. In particular, the proposed methodology reveals that worldwide business cycles de-coupled during the Gold Standard, though they were synchronized during the Great Depression. The Bretton Woods era was associated with a lower degree of synchronization as compared to that during the Great Depression, while worldwide business cycle synchronization increased to unprecedented levels during the latest period of floating exchange rates and the Great Recession.

Medical issues in synchronized skating.

Science.gov (United States)

Abbott, Kristin; Hecht, Suzanne

2013-01-01

Synchronized skating is a unique sport of team skating and currently represents the largest competitive discipline in U.S. Figure Skating. Synchronized skating allows skaters to compete as part of a team with opportunities to represent their country in international competitions. As the popularity of the sport continues to grow, more of these athletes will present to sports medicine clinics with injuries and illnesses related to participation in synchronized skating. The purpose of this article is to review the common injuries and medical conditions affecting synchronized skaters.

Acesso ao atendimento à saúde e diagnóstico da tuberculose

Directory of Open Access Journals (Sweden)

Dândara Nayara Azevêdo Dantas

2014-01-01

Full Text Available El objetivo fue conocer la evaluación de pacientes con tuberculosis cuanto el acceso a la atención de salud y al diagnóstico de la enfermedad. Estudio transversal, cuantitativo, realizado en Natal, RN, Brasil entre febrero/septiembre de 2012, con 60 personas con diagnóstico de tuberculosis. Los datos fueron analizados por cuestionario y analizados por estadística descriptiva. El acceso a la atención de salud fue considerada fácil por 80% de los pacientes. De éstos, 35% consideraron fácil debido a la rapidez para consulta y 21,7% por tener relación con los profesionales. El acceso al diagnóstico también fue evaluado como fácil (85%. Del total, 33,3% evaluaron la facilidad de realización de los exámenes en el local de atención y 13,3% la adquisición de consulta inmediata. En conclusión, la organización de los servicios fue crucial para clasificación de facilidad o dificultad del acceso a la atención de salud y diagnóstico de la enfermedad.

Aspectos do diagnóstico na Síndrome de Sjögren

Directory of Open Access Journals (Sweden)

Liquidato Bianca M.

2002-01-01

Full Text Available Introdução: A Síndrome de Sjögren é uma doença auto-imune que envolve principalmente as glândulas salivares e lacrimais e que pode cursar apenas com xerostomia e diminuição do lacrimejamento ou mesmo com outras manifestações sistêmicas. Vários estudos tentaram estabelecer critérios diagnósticos, já que não existe um exame de certeza. Objetivo: Nosso estudo tem como objetivo a avaliação dos métodos utilizados para o diagnóstico da doença. Forma de estudo: Clínico prospectivo. Material e Método: Foram avaliadas 15 pacientes com suspeita de Síndrome de Sjögren no Ambulatório de Estomatologia do Depto. de Otorrinolaringologia da Santa Casa de São Paulo. Resultados: Das 15 pacientes avaliadas, o diagnóstico foi confirmado apenas em 6 casos. Conclusões: Existe grande dificuldade em se estabelecer o diagnóstico desta doença e, por este motivo, técnicas de exame pouco invasivas devem ser desenvolvidas com a participação do otorrinolaringologista.

STUDYING BUSINESS CYCLES SYNCHRONIZATION

Directory of Open Access Journals (Sweden)

N. Servetnyk

2014-06-01

Full Text Available The paper researches business cycles synchronization. The fluctuations in post-Soviet countries are considered. The study examines different measures of synchronization in groups of countries according to some criteria.

Investigation of phase synchronization of interictal EEG in right temporal lobe epilepsy

Science.gov (United States)

Yu, Haitao; Cai, Lihui; Wu, Xinyu; Song, Zhenxi; Wang, Jiang; Xia, Zijie; Liu, Jing; Cao, Yibin

2018-02-01

Epilepsy is commonly associated with abnormally synchronous activity of neurons located in epileptogenic zones. In this study, we investigated the synchronization characteristic of right temporal lobe epilepsy (RTLE). Multichannel electroencephalography (EEG) data were recorded from the RTLE patients during interictal period and normal controls. Power spectral density was first used to analyze the EEG power for two groups of subjects. It was found that the power of epileptics is increased in the whole brain compared with that of the control. We calculated phase lag index (PLI) to measure the phase synchronization between each pair of EEG signals. A higher degree of synchronization was observed in the epileptics especially between distant channels. In particular, the regional synchronization degree was negatively correlated with power spectral density and the correlation was weaker for epileptics. Moreover, the synchronization degree decayed with the increase of relative distance of channels for both the epilepsy and control, but the dependence was weakened in the former. The obtained results may provide new insights into the generation mechanism of epilepsy.

Clock synchronization and dispersion

International Nuclear Information System (INIS)

Giovannetti, Vittorio; Lloyd, Seth; Maccone, Lorenzo; Wong, Franco N C

2002-01-01

We present a method to defeat effects of dispersion of timing signals when synchronizing clocks. It is based on the recently proposed 'conveyor belt synchronization' scheme and on the quantum dispersion cancellation effect

Dimensiones de análisis del Diagnóstico en Educación: El Diagnóstico del Contexto Familiar [Analysis dimensions in educational diagnosis: Diagnosis of Family Context

Directory of Open Access Journals (Sweden)

Esperanza Ceballos

2006-03-01

Full Text Available Diagnosis of family context has been a subject relatively little considered in the scope of educational diagnosis. Even though whose relevance has been underestimated from the assessment classical perspective, an increasing interest is being aroused, especially on account of holistical and ecological trends. This article intends to offer a synthesis of most relevant topics to be considered in diagnosis of family context, emphasizing its importance for the approach to authentic evaluation. El diagnóstico del contexto familiar ha sido un tema relativamente poco tratado en el ámbito del diagnóstico en educación, y cuya relevancia ha sido soslayada desde la perspectiva clásica del assessment. Sin embargo, se constata un interés creciente suscitado especialmente al hilo de las tendencias holísticas y ecológicas en el diagnóstico. Este artículo pretende ofrecer una síntesis de los tópicos más relevantes a tener en cuenta en el diagnóstico del contexto familiar, subrayando la importancia del análisis de este contexto para la aproximación a una evaluación auté

Pinning Synchronization of Switched Complex Dynamical Networks

Directory of Open Access Journals (Sweden)

Liming Du

2015-01-01

Full Text Available Network topology and node dynamics play a key role in forming synchronization of complex networks. Unfortunately there is no effective synchronization criterion for pinning synchronization of complex dynamical networks with switching topology. In this paper, pinning synchronization of complex dynamical networks with switching topology is studied. Two basic problems are considered: one is pinning synchronization of switched complex networks under arbitrary switching; the other is pinning synchronization of switched complex networks by design of switching when synchronization cannot achieved by using any individual connection topology alone. For the two problems, common Lyapunov function method and single Lyapunov function method are used respectively, some global synchronization criteria are proposed and the designed switching law is given. Finally, simulation results verify the validity of the results.

Synchronization in complex networks

Energy Technology Data Exchange (ETDEWEB)

Arenas, A.; Diaz-Guilera, A.; Moreno, Y.; Zhou, C.; Kurths, J.

2007-12-12

Synchronization processes in populations of locally interacting elements are in the focus of intense research in physical, biological, chemical, technological and social systems. The many efforts devoted to understand synchronization phenomena in natural systems take now advantage of the recent theory of complex networks. In this review, we report the advances in the comprehension of synchronization phenomena when oscillating elements are constrained to interact in a complex network topology. We also overview the new emergent features coming out from the interplay between the structure and the function of the underlying pattern of connections. Extensive numerical work as well as analytical approaches to the problem are presented. Finally, we review several applications of synchronization in complex networks to different disciplines: biological systems and neuroscience, engineering and computer science, and economy and social sciences.

Chaos synchronization of coupled hyperchaotic system

International Nuclear Information System (INIS)

Yang Lixin; Chu Yandong; Zhang Jiangang; Li Xianfeng

2009-01-01

Chaos synchronization, as an important topic, has become an active research subject in nonlinear science. Over the past two decades, chaos synchronization between nonlinear systems has been extensively studied, and many types of synchronization have been announced. This paper introduces synchronization of coupled hyperchaotic system, based on the Lapunov stability theory, asymptotic stability of the system is guaranteed by means of Lapunov function. The numerical simulation was provided in order to show the effectiveness of this method for the synchronization of the chaotic hyperchaotic Chen system and Rossler system.

Modelling and Simulation of a Synchronous Machine with Power Electronic Systems

DEFF Research Database (Denmark)

Chen, Zhe; Blaabjerg, Frede

2005-01-01

is modelled in SIMULINK as well. The resulting model can more accurately represent non-idea situations such as non-symmetrical parameters of the electrical machines and unbalance conditions. The model may be used for both steady state and large-signal dynamic analysis. This is particularly useful......This paper reports the modeling and simulation of a synchronous machine with a power electronic interface in direct phase model. The implementation of a direct phase model of synchronous machines in MATLAB/SIMULINK is presented .The power electronic system associated with the synchronous machine...... in the systems where a detailed study is needed in order to assess the overall system stability. Simulation studies are performed under various operation conditions. It is shown that the developed model could be used for studies of various applications of synchronous machines such as in renewable and DG...

Simple cellular automaton model for traffic breakdown, highway capacity, and synchronized flow

Science.gov (United States)

Kerner, Boris S.; Klenov, Sergey L.; Schreckenberg, Michael

2011-10-01

We present a simple cellular automaton (CA) model for two-lane roads explaining the physics of traffic breakdown, highway capacity, and synchronized flow. The model consists of the rules “acceleration,” “deceleration,” “randomization,” and “motion” of the Nagel-Schreckenberg CA model as well as “overacceleration through lane changing to the faster lane,” “comparison of vehicle gap with the synchronization gap,” and “speed adaptation within the synchronization gap” of Kerner's three-phase traffic theory. We show that these few rules of the CA model can appropriately simulate fundamental empirical features of traffic breakdown and highway capacity found in traffic data measured over years in different countries, like characteristics of synchronized flow, the existence of the spontaneous and induced breakdowns at the same bottleneck, and associated probabilistic features of traffic breakdown and highway capacity. Single-vehicle data derived in model simulations show that synchronized flow first occurs and then self-maintains due to a spatiotemporal competition between speed adaptation to a slower speed of the preceding vehicle and passing of this slower vehicle. We find that the application of simple dependences of randomization probability and synchronization gap on driving situation allows us to explain the physics of moving synchronized flow patterns and the pinch effect in synchronized flow as observed in real traffic data.

Rabdomioma fetal: diagnóstico prenatal y tratamiento

Directory of Open Access Journals (Sweden)

Juan Felipe Jaramillo Daza

2016-09-01

Conclusiones: Las arritmias severas y el hidrops pueden conducir a muerte fetal como consecuencia del rabdomioma cardiaco. Por tanto, se debe llevar a cabo un seguimiento continuo, además de considerar distintos diagnósticos diferenciales.

Bursting synchronization in clustered neuronal networks

International Nuclear Information System (INIS)

Yu Hai-Tao; Wang Jiang; Deng Bin; Wei Xi-Le

2013-01-01

Neuronal networks in the brain exhibit the modular (clustered) property, i.e., they are composed of certain subnetworks with differential internal and external connectivity. We investigate bursting synchronization in a clustered neuronal network. A transition to mutual-phase synchronization takes place on the bursting time scale of coupled neurons, while on the spiking time scale, they behave asynchronously. This synchronization transition can be induced by the variations of inter- and intracoupling strengths, as well as the probability of random links between different subnetworks. Considering that some pathological conditions are related with the synchronization of bursting neurons in the brain, we analyze the control of bursting synchronization by using a time-periodic external signal in the clustered neuronal network. Simulation results show a frequency locking tongue in the driving parameter plane, where bursting synchronization is maintained, even in the presence of external driving. Hence, effective synchronization suppression can be realized with the driving parameters outside the frequency locking region. (interdisciplinary physics and related areas of science and technology)

Gamopatias monoclonais: critérios diagnósticos e diagnósticos diferenciais Monoclonal gammopathies: diagnosis criteria and differential diagnosis

Directory of Open Access Journals (Sweden)

Rosa Malena D. Faria

2007-03-01

Full Text Available As gamopatias monoclonais constituem um grupo de desordens caracterizado pela proliferação monoclonal de plasmócitos, que produzem e secretam imunoglobulina ou fragmento de imunoglobulina monoclonal (proteína M . Este artigo propõe uma revisão dos critérios diagnósticos das principais gamopatias monoclonais e diagnósticos diferenciais, uma vez que é comum a sobreposição de muitas características clínicas entre suas variantes. A gamopatia monoclonal de significado indeterminado (MGUS é definida pela presença de proteína M sérica 30% ou plasmocitoma documentado por biópsia. Se a lesão óssea decorre de plasmocitoma solitário ou somente osteoporose, sem fratura, a plasmocitose medular também precisa ser > 30%, para preencher critérios de MM. As gamopatias monoclonais podem estar associadas a diversas doenças, incluindo desordens linfoproliferativas, reumatológicas, neurológicas, dermatológicas e infecciosas. A definição das características clínicas e laboratoriais de cada entidade, maligna ou benigna, facilita o diagnóstico das gamopatias monoclonais e, como conseqüência, seu manejo clínico pelos médicos assistentes.Monoclonal gammopathies are a group of disorders characterized by proliferation of monoclonal plasma cells, which produce and secrete monoclonal immunoglobulin or fragments of monoclonal immunoglobulin (M protein. This paper proposes to review diagnostic criteria of the most important monoclonal gammopathies and their differential diagnosis, because superposition of many clinical characteristics is common between variants. The monoclonal gammopathy of undetermined significance (MGUS is defined by the presence of serum M protein < 3g/dL and/or urinary M protein < 1g/24h, bone marrow plasma cell < 10%, and absence of organ and tissue damage. Asymptomatic multiple myeloma (MM is characterized by the presence of M protein, bone marrow or tissue biopsy plasma cell infiltration, and non-compliance of the

Síndrome séptico: Importancia del diagnóstico temprano

Directory of Open Access Journals (Sweden)

Enrique Guzmán Rodríguez

1995-04-01

Full Text Available Se realiza un estudio retrospectivo y transversal sobre los pacientes con proceso infeccioso, ingresados en una Unidad de Terapia Intensiva Polivalente (UTIP. Estos representan el 54,2 % de los ingresos totales durante 6 meses y de ellos el 30,1 % muestra síndrome séptico, con una mortalidad los últimos del 24 %. Se estudian 4 grupos de pacientes según el momento de diagnóstico y terapéutica, y se observa que mientras más tarde es el diagnóstico de síndrome séptico, más avanzada la enfermedad hacia etapas más complicadas del fenómeno sepsis/shock séptico y mayor la mortalidad. En aquellos pacientes en los cuales se hizo el diagnóstico al aparecer los elementos clínicos que lo describen, la mortalidad no existe y las complicaciones son menores.

Synchronization controller design of two coupling permanent magnet synchronous motors system with nonlinear constraints.

Science.gov (United States)

Deng, Zhenhua; Shang, Jing; Nian, Xiaohong

2015-11-01

In this paper, two coupling permanent magnet synchronous motors system with nonlinear constraints is studied. First of all, the mathematical model of the system is established according to the engineering practices, in which the dynamic model of motor and the nonlinear coupling effect between two motors are considered. In order to keep the two motors synchronization, a synchronization controller based on load observer is designed via cross-coupling idea and interval matrix. Moreover, speed, position and current signals of two motor all are taken as self-feedback signal as well as cross-feedback signal in the proposed controller, which is conducive to improving the dynamical performance and the synchronization performance of the system. The proposed control strategy is verified by simulation via Matlab/Simulink program. The simulation results show that the proposed control method has a better control performance, especially synchronization performance, than that of the conventional PI controller. Copyright © 2015 ISA. Published by Elsevier Ltd. All rights reserved.

Neural Synchronization and Cryptography

Science.gov (United States)

Ruttor, Andreas

2007-11-01

Neural networks can synchronize by learning from each other. In the case of discrete weights full synchronization is achieved in a finite number of steps. Additional networks can be trained by using the inputs and outputs generated during this process as examples. Several learning rules for both tasks are presented and analyzed. In the case of Tree Parity Machines synchronization is much faster than learning. Scaling laws for the number of steps needed for full synchronization and successful learning are derived using analytical models. They indicate that the difference between both processes can be controlled by changing the synaptic depth. In the case of bidirectional interaction the synchronization time increases proportional to the square of this parameter, but it grows exponentially, if information is transmitted in one direction only. Because of this effect neural synchronization can be used to construct a cryptographic key-exchange protocol. Here the partners benefit from mutual interaction, so that a passive attacker is usually unable to learn the generated key in time. The success probabilities of different attack methods are determined by numerical simulations and scaling laws are derived from the data. They show that the partners can reach any desired level of security by just increasing the synaptic depth. Then the complexity of a successful attack grows exponentially, but there is only a polynomial increase of the effort needed to generate a key. Further improvements of security are possible by replacing the random inputs with queries generated by the partners.

Breast Cancer with Synchronous Renal Cell Carcinoma: A Rare Presentation.

Science.gov (United States)

Arjunan, Ravi; Kumar, Durgesh; Kumar, K V Veerendra; Premlatha, C S

2016-10-01

Primary cancer arising from multiple organs is a well known fact. Synchronous tumours have been most commonly associated with kidney cancer. Bladder, prostate, colorectal and lung cancer are the most common synchronous primaries with Renal Cell Carcinoma (RCC) identified till date. We found metachronous tumours of breast with RCC in literature search which included both metastatic tumours as well second primaries. Overall, 25 cases of metastatic breast tumours and eight cases of second primary in previously treated RCC have been reported in the literature. Here, we are reporting a case of synchronous presentation of carcinoma breast with RCC which is very rare because most of the multiple malignancies reported in the literature are metastatic tumours or metachronous breast malignancy with RCC.

Targeting engineering synchronization in chaotic systems

Science.gov (United States)

Bhowmick, Sourav K.; Ghosh, Dibakar

2016-07-01

A method of targeting engineering synchronization states in two identical and mismatch chaotic systems is explained in detail. The method is proposed using linear feedback controller coupling for engineering synchronization such as mixed synchronization, linear and nonlinear generalized synchronization and targeting fixed point. The general form of coupling design to target any desire synchronization state under unidirectional coupling with the help of Lyapunov function stability theory is derived analytically. A scaling factor is introduced in the coupling definition to smooth control without any loss of synchrony. Numerical results are done on two mismatch Lorenz systems and two identical Sprott oscillators.

Generation-based memory synchronization in a multiprocessor system with weakly consistent memory accesses

Energy Technology Data Exchange (ETDEWEB)

Ohmacht, Martin

2017-08-15

In a multiprocessor system, a central memory synchronization module coordinates memory synchronization requests responsive to memory access requests in flight, a generation counter, and a reclaim pointer. The central module communicates via point-to-point communication. The module includes a global OR reduce tree for each memory access requesting device, for detecting memory access requests in flight. An interface unit is implemented associated with each processor requesting synchronization. The interface unit includes multiple generation completion detectors. The generation count and reclaim pointer do not pass one another.

Generation-based memory synchronization in a multiprocessor system with weakly consistent memory accesses

Science.gov (United States)

Ohmacht, Martin

2014-09-09

In a multiprocessor system, a central memory synchronization module coordinates memory synchronization requests responsive to memory access requests in flight, a generation counter, and a reclaim pointer. The central module communicates via point-to-point communication. The module includes a global OR reduce tree for each memory access requesting device, for detecting memory access requests in flight. An interface unit is implemented associated with each processor requesting synchronization. The interface unit includes multiple generation completion detectors. The generation count and reclaim pointer do not pass one another.

Physical Layer Ethernet Clock Synchronization

Science.gov (United States)

2010-11-01

42 nd Annual Precise Time and Time Interval (PTTI) Meeting 77 PHYSICAL LAYER ETHERNET CLOCK SYNCHRONIZATION Reinhard Exel, Georg...oeaw.ac.at Nikolaus Kerö Oregano Systems, Mohsgasse 1, 1030 Wien, Austria E-mail: nikolaus.keroe@oregano.at Abstract Clock synchronization ...is a service widely used in distributed networks to coordinate data acquisition and actions. As the requirement to achieve tighter synchronization

Diagnóstico de enfermagem Eliminação urinária prejudicada em pessoas com Diabetes Mellitus

Directory of Open Access Journals (Sweden)

Carla Regina de Souza Teixeira

2010-12-01

Full Text Available Estudo exploratório descritivo com o objetivo de descrever os diagnósticos de enfermagem em pessoas com diabetes mellitus que apresentaram diagnóstico de enfermagem Eliminação urinária prejudicada. Os dados foram obtidos através do exame físico e a técnica de entrevista dirigida. Após a coleta de dados, procedeu-se a identificação dos diagnósticos de enfermagem nomeados de acordo com a Taxonomia II da NANDA, utilizando o processo de raciocínio diagnóstico de Risner. Das 31 pessoas entrevistadas, identificou-se 10 (32% sujeitos que apresentaram o diagnóstico de enfermagem eliminação urinária prejudicada. Conhecer os fatores relacionados e as caracteristicas definidoras desse diagnóstico possibilita que o enfermeiro trace intervenções de enfermagem que preservem a função renal, e consequentemente a nefropatia diabética.

Nonlinear Dynamics of Controlled Synchronizations of Manipulator System

Directory of Open Access Journals (Sweden)

Qingkai Han

2014-01-01

Full Text Available The nonlinear dynamics of the manipulator system which is controlled to achieve the synchronization motions is investigated in the paper. Firstly, the control strategies and modeling approaches of the manipulator system are given, in which the synchronization goal is defined by both synchronization errors and its derivatives. The synchronization controllers applied on the manipulator system include neuron synchronization controller, improved OPCL synchronization controller, and MRAC-PD synchronization controller. Then, an improved adaptive synchronized control strategy is proposed in order to estimate online the unknown structure parameters and state variables of the manipulator system and to realize the needed synchronous compensation. Furthermore, a robust adaptive synchronization controller is also researched to guarantee the dynamic stability of the system. Finally, the stability of motion synchronizations of the manipulator system possessing nonlinear component is discussed, together with the effect of control parameters and joint friction and others. Some typical motions such as motion bifurcations and the loss of synchronization of it are obtained and illustrated as periodic, multiperiodic, and/or chaotic motion patterns.

Continuous and discontinuous transitions to synchronization.

Science.gov (United States)

Wang, Chaoqing; Garnier, Nicolas B

2016-11-01

We describe how the transition to synchronization in a system of globally coupled Stuart-Landau oscillators changes from continuous to discontinuous when the nature of the coupling is moved from diffusive to reactive. We explain this drastic qualitative change as resulting from the co-existence of a particular synchronized macrostate together with the trivial incoherent macrostate, in a range of parameter values for which the latter is linearly stable. In contrast to the paradigmatic Kuramoto model, this particular state observed at the synchronization transition contains a finite, non-vanishing number of synchronized oscillators, which results in a discontinuous transition. We consider successively two situations where either a fully synchronized state or a partially synchronized state exists at the transition. Thermodynamic limit and finite size effects are briefly discussed, as well as connections with recently observed discontinuous transitions.

Adaptive feedback synchronization of Lue system

International Nuclear Information System (INIS)

Han, X.; Lu, J.-A.; Wu, X.

2004-01-01

This letter further improves and extends the works of Chen and Lue [Chaos, Solitons and Fractals 14 (2002) 643] and Wang et al. [Phys. Lett. A 312 (2003) 34]. In detail, the linear feedback synchronization and adaptive feedback synchronization for Lue system are discussed. And the lower bound of the feedback gain in linear feedback synchronization is presented. The adaptive feedback synchronization with only one controller is designed, which improves the proof in the work by Wang et al. The adaptive synchronization with two controllers for completely uncertain Lue system is also discussed, which extends the work of Chen and Lue. Also, numerical simulations show the effectiveness of these methods

Generalized synchronization between chimera states

Science.gov (United States)

Andrzejak, Ralph G.; Ruzzene, Giulia; Malvestio, Irene

2017-05-01

Networks of coupled oscillators in chimera states are characterized by an intriguing interplay of synchronous and asynchronous motion. While chimera states were initially discovered in mathematical model systems, there is growing experimental and conceptual evidence that they manifest themselves also in natural and man-made networks. In real-world systems, however, synchronization and desynchronization are not only important within individual networks but also across different interacting networks. It is therefore essential to investigate if chimera states can be synchronized across networks. To address this open problem, we use the classical setting of ring networks of non-locally coupled identical phase oscillators. We apply diffusive drive-response couplings between pairs of such networks that individually show chimera states when there is no coupling between them. The drive and response networks are either identical or they differ by a variable mismatch in their phase lag parameters. In both cases, already for weak couplings, the coherent domain of the response network aligns its position to the one of the driver networks. For identical networks, a sufficiently strong coupling leads to identical synchronization between the drive and response. For non-identical networks, we use the auxiliary system approach to demonstrate that generalized synchronization is established instead. In this case, the response network continues to show a chimera dynamics which however remains distinct from the one of the driver. Hence, segregated synchronized and desynchronized domains in individual networks congregate in generalized synchronization across networks.

Synchronization of motor unit firings: an epiphenomenon of firing rate characteristics not common inputs.

Science.gov (United States)

Kline, Joshua C; De Luca, Carlo J

2016-01-01

Synchronous motor unit firing instances have been attributed to anatomical inputs shared by motoneurons. Yet, there is a lack of empirical evidence confirming the notion that common inputs elicit synchronization under voluntary conditions. We tested this notion by measuring synchronization between motor unit action potential trains (MUAPTs) as their firing rates progressed within a contraction from a relatively low force level to a higher one. On average, the degree of synchronization decreased as the force increased. The common input notion provides no empirically supported explanation for the observed synchronization behavior. Therefore, we investigated a more probable explanation for synchronization. Our data set of 17,546 paired MUAPTs revealed that the degree of synchronization varies as a function of two characteristics of the motor unit firing rate: the similarity and the slope as a function of force. Both are measures of the excitation of the motoneurons. As the force generated by the muscle increases, the firing rate slope decreases, and the synchronization correspondingly decreases. Different muscles have motor units with different firing rate characteristics and display different amounts of synchronization. Although this association is not proof of causality, it consistently explains our observations and strongly suggests further investigation. So viewed, synchronization is likely an epiphenomenon, subject to countless unknown neural interactions. As such, synchronous firing instances may not be the product of a specific design and may not serve a specific physiological purpose. Our explanation for synchronization has the advantage of being supported by empirical evidence, whereas the common input does not. Copyright © 2016 the American Physiological Society.

Diagnóstico psiquiátrico, discapacidad intelectual y criterios de diagnóstico para trastornos psiquiátricos en adultos con discapacidad de aprendizaje/retraso mental (DC-LD)

OpenAIRE

2004-01-01

La clasificación de las psicopatologías a través de unos criterios de diagnóstico operacionalizados constituye uno de los componentes del proceso de evaluación psiquiátrica. La literatura anterior ha demostrado que existen limitaciones a la hora de utilizar la Clasificación Internacional de Enfermedades-10 (CIE-10) y el Manual Diagnóstico y Estadístico (DSM-IV) en adultos con discapacidad intelectual.

Outer Synchronization of Complex Networks by Impulse

International Nuclear Information System (INIS)

Sun Wen; Yan Zizong; Chen Shihua; Lü Jinhu

2011-01-01

This paper investigates outer synchronization of complex networks, especially, outer complete synchronization and outer anti-synchronization between the driving network and the response network. Employing the impulsive control method which is uncontinuous, simple, efficient, low-cost and easy to implement in practical applications, we obtain some sufficient conditions of outer complete synchronization and outer anti-synchronization between two complex networks. Numerical simulations demonstrate the effectiveness of the proposed impulsive control scheme. (general)

Escala de Calgary para el diagnóstico del síncope vasovagal. Estudio de pruebas diagnósticas

Directory of Open Access Journals (Sweden)

Jhonny A. Castaño-Morales

2015-07-01

Conclusiones: Debido a su buena sensibilidad y fácil aplicación, la escala de Calgary es un instrumento útil para el abordaje diagnóstico de pacientes con sospecha de síncope vasovagal y corazón estructuralmente sano, especialmente en menores de 50 años de edad.

An Empirical Investigation of Student Acceptance of Synchronous E-Learning in an Online University

Science.gov (United States)

Kang, Minseok; Shin, Won sug

2015-01-01

This study proposes an extended technology acceptance model to predict acceptance of synchronous e-learning by examining relationships among variables associated with factors influencing the technology acceptance of synchronous e-learning. Learners at an online university participated through an online survey; there were 251 respondents in all.…

Leader emergence through interpersonal neural synchronization.

Science.gov (United States)

Jiang, Jing; Chen, Chuansheng; Dai, Bohan; Shi, Guang; Ding, Guosheng; Liu, Li; Lu, Chunming

2015-04-07

The neural mechanism of leader emergence is not well understood. This study investigated (i) whether interpersonal neural synchronization (INS) plays an important role in leader emergence, and (ii) whether INS and leader emergence are associated with the frequency or the quality of communications. Eleven three-member groups were asked to perform a leaderless group discussion (LGD) task, and their brain activities were recorded via functional near infrared spectroscopy (fNIRS)-based hyperscanning. Video recordings of the discussions were coded for leadership and communication. Results showed that the INS for the leader-follower (LF) pairs was higher than that for the follower-follower (FF) pairs in the left temporo-parietal junction (TPJ), an area important for social mentalizing. Although communication frequency was higher for the LF pairs than for the FF pairs, the frequency of leader-initiated and follower-initiated communication did not differ significantly. Moreover, INS for the LF pairs was significantly higher during leader-initiated communication than during follower-initiated communications. In addition, INS for the LF pairs during leader-initiated communication was significantly correlated with the leaders' communication skills and competence, but not their communication frequency. Finally, leadership could be successfully predicted based on INS as well as communication frequency early during the LGD (before half a minute into the task). In sum, this study found that leader emergence was characterized by high-level neural synchronization between the leader and followers and that the quality, rather than the frequency, of communications was associated with synchronization. These results suggest that leaders emerge because they are able to say the right things at the right time.

Chaos synchronization between Chen system and Genesio system

International Nuclear Information System (INIS)

Wu Xianyong; Guan Zhihong; Wu Zhengping; Li Tao

2007-01-01

This Letter presents two synchronization schemes between two different chaotic systems. Active control synchronization and adaptive synchronization between Chen system and Genesio system are studied, different controllers are designed to synchronize the drive and response systems, active control synchronization is used when system parameters are known; adaptive synchronization is employed when system parameters are unknown or uncertain. Simulation results show the effectiveness of the proposed schemes

Prática baseada em evidências, aplicada ao raciocínio diagnóstico Práctica basada en evidencia aplicada en el raciocinio diagnóstico Evidence-based practice applied to diagnostic reasoning

Directory of Open Access Journals (Sweden)

Diná de Almeida Lopes Monteiro da Cruz

2005-06-01

Full Text Available As enfermeiras aplicam conhecimento, habilidades perceptuais e cognitivas para analisar dados dos pacientes e propor intervenções de enfermagem. Os resultados dessas intervenções dependem da adequação de sua proposição, o que, por sua vez, depende da acurácia das interpretações dos dados dos pacientes. O objetivo deste artigo é discutir a aplicação de princípios da prática baseada em evidência (PBE às decisões diagnósticas no cuidado de enfermagem, utilizando estudo de caso escrito. Os princípios da prática baseada em evidências, na definição do diagnóstico, são: a validade de um teste diagnóstico; a capacidade de o teste discriminar aqueles que apresentam uma resposta específica; a capacidade de o teste estimar a magnitude da resposta; e a adequação do teste diagnóstico ao contexto clínico. Lacunas no conhecimento de enfermagem limitam a aplicação dos princípios da PBE na avaliação clínica e no diagnóstico de enfermagem. As autoras apresentam uma estrutura para exemplificar o uso da PBE no raciocínio diagnóstico.Las enfermeras aplican conocimientos, habilidades preceptivas y cognoscitivas para analizar los datos de los pacientes y proponer intervenciones de enfermería. Los resultados de esas intervenciones dependen del refinamiento de las preposiciones que, a su vez, depende del discernimiento de las interpretaciones de los datos de los pacientes. El propósito de este artículo es aplicar el modelo de la práctica basada en la evidencia (PBE en el raciocinio diagnóstico, utilizando estudio de caso escrito. Los principios de la PBE en la definición del diagnóstico son: validad del test diagnóstico; la capacidad del test en estimar la magnitud de la respuesta; y la adecuación del test diagnóstico al contexto clínico. Lagunas en el conocimiento de enfermería limitan la aplicación de los principios de la PBE en la evaluación clínica y en el diagnóstico de enfermería. Las autoras presentan una

Tomografia computadorizada no diagnóstico da otosclerose fenestral

Directory of Open Access Journals (Sweden)

Vicente Andy de Oliveira

2004-01-01

Full Text Available OBJETIVO: Identificar os principais achados tomográficos da otosclerose fenestral e avaliar a utilidade da tomografia computadorizada de alta resolução (TCAR, como método diagnóstico dessa osteodistrofia. FORMA DE ESTUDO: Estudo prospectivo multicêntrico com tomografia computadorizada (TC de ossos temporais. MATERIAL E MÉTODO: 54 pacientes com diagnóstico clínico e cirúrgico de otosclerose. Foi realizada uma análise tomográfica, em que foi avaliada a sensibilidade da TC no diagnóstico radiológico da otosclerose fenestral, sendo verificados os principais sítios de lesões dessa doença, como também a sua bilateralidade e simetria. Foram incluídos neste estudo 22 pacientes submetidos à TC de ossos temporais para investigação de outras afecções otológicas, que constituíram o grupo controle. RESULTADOS: A TC foi positiva em 87% dos pacientes (77% das orelhas. Os achados tomográficos foram bilaterais na maioria dos casos (78,7%, e o foco fenestral mais prevalente foi o foco anterior à janela oval (FAJO. CONCLUSÕES: A TC apresentou um alto índice de positividade e o FAJO foi o foco mais prevalente nessa população, podendo ser considerado um achado tomográfico altamente sugestivo de otosclerose.

Synchronization of indirectly coupled Lorenz oscillators

Indian Academy of Sciences (India)

Synchronization of indirectly coupled Lorenz oscillators: An experimental study. Amit Sharma Manish Dev Shrimali. Synchronization, Coupled Systems and Networks Volume 77 Issue 5 November 2011 pp 881-889 ... The in-phase and anti-phase synchronization of indirectly coupled chaotic oscillators reported in Phys. Rev ...

A synchronous game for binary constraint systems

Science.gov (United States)

Kim, Se-Jin; Paulsen, Vern; Schafhauser, Christopher

2018-03-01

Recently, Slofstra proved that the set of quantum correlations is not closed. We prove that the set of synchronous quantum correlations is not closed, which implies his result, by giving an example of a synchronous game that has a perfect quantum approximate strategy but no perfect quantum strategy. We also exhibit a graph for which the quantum independence number and the quantum approximate independence number are different. We prove new characterisations of synchronous quantum approximate correlations and synchronous quantum spatial correlations. We solve the synchronous approximation problem of Dykema and the second author, which yields a new equivalence of Connes' embedding problem in terms of synchronous correlations.

Long-range synchronization and local desynchronization of alpha oscillations during visual short-term memory retention in children.

Science.gov (United States)

Doesburg, Sam M; Herdman, Anthony T; Ribary, Urs; Cheung, Teresa; Moiseev, Alexander; Weinberg, Hal; Liotti, Mario; Weeks, Daniel; Grunau, Ruth E

2010-04-01

Local alpha-band synchronization has been associated with both cortical idling and active inhibition. Recent evidence, however, suggests that long-range alpha synchronization increases functional coupling between cortical regions. We demonstrate increased long-range alpha and beta band phase synchronization during short-term memory retention in children 6-10 years of age. Furthermore, whereas alpha-band synchronization between posterior cortex and other regions is increased during retention, local alpha-band synchronization over posterior cortex is reduced. This constitutes a functional dissociation for alpha synchronization across local and long-range cortical scales. We interpret long-range synchronization as reflecting functional integration within a network of frontal and visual cortical regions. Local desynchronization of alpha rhythms over posterior cortex, conversely, likely arises because of increased engagement of visual cortex during retention.

Diagnósticos de Enfermagem em pacientes pós-cateterismo cardíaco: contribuição de Orem Diagnósticos de Enfermería en pacientes post-cateterismo cardiaco: contribuición de Orem Nursing Diagnoses in patients after heart catheterization: contribution of Orem

Directory of Open Access Journals (Sweden)

Luciano Ramos de Lima

2006-06-01

Full Text Available Estudo de múltiplos casos, transversal, envolvendo 30 clientes, no período pós-cateterismo cardíaco. Objetivou estabelecer Diagnósticos de Enfermagem da North American Nursing Diagnosis Association (NANDA. O método de coleta de dados foi o Processo de Enfermagem fundamentado na Teoria Déficit do Autocuidado. Foram estabelecidos 25 diferentes Diagnósticos de Enfermagem. Todos os pacientes apresentaram Integridade tissular prejudicada; Risco para infecção; Dor aguda (região inguinal; Mobilidade física prejudicada, Déficit do autocuidado para higiene íntima e Risco para lesão orgânica renal. Conclui-se que a Teoria do Déficit de autocuidado facilitou a classificação de Diagnósticos de Enfermagem da NANDA, contribuindo para individualização, humanização e qualificação da assistência de enfermagem, além de promover o auto-conhecimento, auto-controle e a participação dos clientes no próprio cuidado.Estudio transversal de múltiplos casos, incluyendo 30 pacientes, en período post-cateterismo cardíaco. Con el objectivo de establecer Diagnósticos de Enfermería de North American Nursing Diagnosis Association (NANDA-Asociación Norteamericana de Diagnósticos de Enfermería.El método de recolecta de datos fue el Proceso de Enfermería, fundamentado en la Teoría de Déficit del Autocuidado de Dorothea Orem. Fueron establecidos 25 diferentes Diagnósticos de Enfermería. Todos los pacientes presentaron perfusión tisular perjudicada; Riesgo para infección; Dolor aguda em la región ingle, Movilidad física prejudicada. Déficit de autocuidado para higiene íntima y riesgo para lesión orgánica renal fue identificado en 100% de los pacientes. Se concluye que, la Teoría de Déficit de Autocuidado de Dorothea Orem, facilitó la clasificación de Diagnósticos de Enfermería de NANDA. Contribuyó para individualización, humanización y calificación de la asistencia de enfermería, incentivando la participación del

Diagnósticos de enfermagem e problemas colaborativos mais comuns na gestação de risco Diagnósticos de enfermería y problemas colaborativos más comunes en el embarazo de alto riesgo Nursing dignoses and most common collaboration problems in high-risk pregnancy

Directory of Open Access Journals (Sweden)

Helga Geremias Gouveia

2004-04-01

Full Text Available Este estudo identificou o perfil demográfico, os diagnósticos clínicos e obstétricos, os diagnósticos de enfermagem e problemas colaborativos mais comuns a gestantes de risco em um hospital da cidade de São Paulo, em São Paulo, Brasil. Os dados foram coletados utilizando-se um formulário baseado nos Padrões Funcionais de Saúde de Gordon. Os diagnósticos de enfermagem foram determinados de acordo com a taxonomia da North American Nursing Diagnosis Association (NANDA. Os diagnósticos de enfermagem encontrados em 50% ou mais das gestantes foram: risco para infecção (90,1%; manutenção da saúde alterada (84,5%; conforto alterado (80,3%; risco para amamentação ineficaz (59,2%; padrões de sexualidade alterados (52,1%; medo (52,1% e dor (50,7%. Os problemas colaborativos encontrados em 50% ou mais dos casos foram: CP: trabalho de parto prematuro (62%; CP: taquicardia materna (54,9% e CP: hipotensão (54,9%. Assim, com base nesses resultados será possível direcionar a assistência de enfermagem prestada a essas gestantes.Este estudio tiene como propuesta identificar el perfil demográfico, diagnósticos clínico y obstétrico, diagnósticos de enfermería y problemas colaborativos más comunes en el embarazo de alto riesgo del hospital de la ciudad de São Paulo, Brazil. Los datos fueron recolectados utilizándose un formulario basado en los padrones funcionales de salud de Gordon. Los diagnósticos de enfermería fueron determinados de acuerdo con la taxonomía da North American Nursing Diagnosis Association (NANDA. Los diagnósticos de enfermería encontrados en 50% o más de las gestantes fueron: Riesgo para infección (90,1%; Manutención de la salud alterada (84,5%; Confort alterado (80,3%; Riesgo para la lactancia ineficaz (59,2%; Patrones de sexualidad alterados (52,1%; Miedo (52,1% y Dolor (50,7%. Los problemas colaborativos encontrados en 50% o más de los casos fueron: Trabajo de parto prematuro (62,0%; Taquicardia materna

Control synchronization of differential mobile robots

NARCIS (Netherlands)

Nijmeijer, H.; Rodriguez Angeles, A.; Allgoewer, F.

2004-01-01

In this paper a synchronization controller for differential mobile robots is proposed. The synchronization goal is to control the angular position of each wheel to a desired trajectory and at the same time the differential (or synchronization) error between the angular positions of the two wheels.

Frame Synchronization Without Attached Sync Markers

Science.gov (United States)

Hamkins, Jon

2011-01-01

We describe a method to synchronize codeword frames without making use of attached synchronization markers (ASMs). Instead, the synchronizer identifies the code structure present in the received symbols, by operating the decoder for a handful of iterations at each possible symbol offset and forming an appropriate metric. This method is computationally more complex and doesn't perform as well as frame synchronizers that utilize an ASM; nevertheless, the new synchronizer acquires frame synchronization in about two seconds when using a 600 kbps software decoder, and would take about 15 milliseconds on prototype hardware. It also eliminates the need for the ASMs, which is an attractive feature for short uplink codes whose coding gain would be diminished by the overheard of ASM bits. The lack of ASMs also would simplify clock distribution for the AR4JA low-density parity-check (LDPC) codes and adds a small amount to the coding gain as well (up to 0.2 dB).

Analysis of remote synchronization in complex networks

Science.gov (United States)

Gambuzza, Lucia Valentina; Cardillo, Alessio; Fiasconaro, Alessandro; Fortuna, Luigi; Gómez-Gardeñes, Jesus; Frasca, Mattia

2013-12-01

A novel regime of synchronization, called remote synchronization, where the peripheral nodes form a phase synchronized cluster not including the hub, was recently observed in star motifs [Bergner et al., Phys. Rev. E 85, 026208 (2012)]. We show the existence of a more general dynamical state of remote synchronization in arbitrary networks of coupled oscillators. This state is characterized by the synchronization of pairs of nodes that are not directly connected via a physical link or any sequence of synchronized nodes. This phenomenon is almost negligible in networks of phase oscillators as its underlying mechanism is the modulation of the amplitude of those intermediary nodes between the remotely synchronized units. Our findings thus show the ubiquity and robustness of these states and bridge the gap from their recent observation in simple toy graphs to complex networks.

Diagnóstico y tratamiento de lesiones cariosas incipientes en caras oclusales

Directory of Open Access Journals (Sweden)

Verónica Cueto Rostom

Full Text Available Las fosas y fisuras continúan siendo las áreas más vulnerables al desarrollo de las lesiones cariosas. A diferencia de las lesiones cariosas de superficies lisas, el desarrollo de las mismas en las superficies oclusales es menos susceptible a la acción de los fluoruros. Por otra parte el diagnóstico de caries en superficies oclusales se está tornando cada vez más difícil ya que ocurren cambios en el patrón de estas lesiones debido al uso del fluoruro. El esmalte se observa intacto debido a su remineralización superficial, pero dicha remineralización no alcanza a la dentina. Los clínicos disponen hoy en día de una amplia gama de opciones terapéuticas a su disposición para el manejo de lesiones oclusales. La selección del tipo de tratamiento debe basarse en el diagnóstico. La precisión de este diagnóstico es crucial, a fin de poder distinguir lesiones que pueden ser tratadas por métodos no invasivos de aquellas que justificarían un tratamiento restaurador. El objetivo de este trabajo es describir y evaluar varios métodos de diagnóstico de lesiones cariosas oclusales, así como también distintas opciones terapéuticas para las mismas

RUN LENGTH SYNCHRONIZATION TECHNIQUES

Science.gov (United States)

An important aspect of digital communications is the problem of determining efficient methods for acquiring block synchronization . In this paper we...utilizes an N-digit sync sequence as prefix to the data blocks. The results of this study show that this technique is a practical method for acquiring block synchronization .

Complete synchronization of two Chen-Lee systems

International Nuclear Information System (INIS)

Sheu, L-J; Chen, J-H; Chen, H-K; Tam, L-M; Lao, S-K; Chen, W-C; Lin, K-T

2008-01-01

This study demonstrates that complete synchronization of two Chen-Lee chaotic systems can be easily achieved. The upper bound of the Chen-Lee chaotic system is estimated numerically. A controller is designed to synchronize two chaotic systems. Sufficient conditions for synchronization are obtained using Lyapunov's direct method. Two numerical examples are presented to verify the proposed synchronization approach

Autapse-induced synchronization in a coupled neuronal network

International Nuclear Information System (INIS)

Ma, Jun; Song, Xinlin; Jin, Wuyin; Wang, Chuni

2015-01-01

Highlights: • The functional effect of autapse on neuronal activity is detected. • Autapse driving plays active role in regulating electrical activities as pacemaker. • It confirms biological experimental results for rhythm synchronization between heterogeneous cells. - Abstract: The effect of autapse on coupled neuronal network is detected. In our studies, three identical neurons are connected with ring type and autapse connected to one neuron of the network. The autapse connected to neuron can impose time-delayed feedback in close loop on the neuron thus the dynamics of membrane potentials can be changed. Firstly, the effect of autapse driving on single neuron is confirmed that negative feedback can calm down the neuronal activity while positive feedback can excite the neuronal activity. Secondly, the collective electrical behaviors of neurons are regulated by a pacemaker, which associated with the autapse forcing. By using appropriate gain and time delay in the autapse, the neurons can reach synchronization and the membrane potentials of all neurons can oscillate with the same rhythm under mutual coupling. It indicates that autapse forcing plays an important role in changing the collective electric activities of neuronal network, and appropriate electric modes can be selected due to the switch of feedback type(positive or negative) in autapse. And the autapse-induced synchronization in network is also consistent with some biological experiments about synchronization between nonidentical neurons.

Robust finite-time chaos synchronization of uncertain permanent magnet synchronous motors.

Science.gov (United States)

Chen, Qiang; Ren, Xuemei; Na, Jing

2015-09-01

In this paper, a robust finite-time chaos synchronization scheme is proposed for two uncertain third-order permanent magnet synchronous motors (PMSMs). The whole synchronization error system is divided into two cascaded subsystems: a first-order subsystem and a second-order subsystem. For the first subsystem, we design a finite-time controller based on the finite-time Lyapunov stability theory. Then, according to the backstepping idea and the adding a power integrator technique, a second finite-time controller is constructed recursively for the second subsystem. No exogenous forces are required in the controllers design but only the direct-axis (d-axis) and the quadrature-axis (q-axis) stator voltages are used as manipulated variables. Comparative simulations are provided to show the effectiveness and superior performance of the proposed method. Copyright © 2015 ISA. Published by Elsevier Ltd. All rights reserved.

Synchronization in Quantum Key Distribution Systems

Directory of Open Access Journals (Sweden)

Anton Pljonkin

2017-10-01

Full Text Available In the description of quantum key distribution systems, much attention is paid to the operation of quantum cryptography protocols. The main problem is the insufficient study of the synchronization process of quantum key distribution systems. This paper contains a general description of quantum cryptography principles. A two-line fiber-optic quantum key distribution system with phase coding of photon states in transceiver and coding station synchronization mode was examined. A quantum key distribution system was built on the basis of the scheme with automatic compensation of polarization mode distortions. Single-photon avalanche diodes were used as optical radiation detecting devices. It was estimated how the parameters used in quantum key distribution systems of optical detectors affect the detection of the time frame with attenuated optical pulse in synchronization mode with respect to its probabilistic and time-domain characteristics. A design method was given for the process that detects the time frame that includes an optical pulse during synchronization. This paper describes the main quantum communication channel attack methods by removing a portion of optical emission. This paper describes the developed synchronization algorithm that takes into account the time required to restore the photodetector’s operation state after the photon has been registered during synchronization. The computer simulation results of the developed synchronization algorithm were analyzed. The efficiency of the developed algorithm with respect to synchronization process protection from unauthorized gathering of optical emission is demonstrated herein.

EEG Alpha Synchronization Is Related to Top-Down Processing in Convergent and Divergent Thinking

Science.gov (United States)

Benedek, Mathias; Bergner, Sabine; Konen, Tanja; Fink, Andreas; Neubauer, Aljoscha C.

2011-01-01

Synchronization of EEG alpha activity has been referred to as being indicative of cortical idling, but according to more recent evidence it has also been associated with active internal processing and creative thinking. The main objective of this study was to investigate to what extent EEG alpha synchronization is related to internal processing…

Testing of motor unit synchronization model for localized muscle fatigue.

Science.gov (United States)

Naik, Ganesh R; Kumar, Dinesh K; Yadav, Vivek; Wheeler, Katherine; Arjunan, Sridhar

2009-01-01

Spectral compression of surface electromyogram (sEMG) is associated with onset of localized muscle fatigue. The spectral compression has been explained based on motor unit synchronization theory. According to this theory, motor units are pseudo randomly excited during muscle contraction, and with the onset of muscle fatigue the recruitment pattern changes such that motor unit firings become more synchronized. While this is widely accepted, there is little experimental proof of this phenomenon. This paper has used source dependence measures developed in research related to independent component analysis (ICA) to test this theory.

Hipo, un desafío diagnóstico

Directory of Open Access Journals (Sweden)

Sonia Pankl

2014-02-01

Full Text Available El hipo es una contracción espasmódica involuntaria del diafragma que desencadena una inspiración súbita y cierre abrupto de la glotis originando un sonido característico. Según su duración se clasifica en ataque de hipo, hipo persistente o hipo intratable o rebelde. Presentamos el caso de un varón de 75 años de edad con hipo rebelde que le impedía conciliar el sueño, diurno y nocturno, asociado a eructos, de tres años de evolución, refractario al tratamiento con clorpromazina. Luego de una extensa evaluación se llegó al diagnóstico de tumor en seno etmoidal derecho. Se efectuó la resección del tumor y posterior radioterapia local con desaparición del hipo. Consideramos ésta una causa rara de hipo rebelde que generó un desafío diagnóstico y terapéutico.

Synchronization of hyperchaotic oscillators

DEFF Research Database (Denmark)

Tamasevicius, A.; Cenys, A.; Mykolaitis, G.

1997-01-01

Synchronization of chaotic oscillators is believed to have promising applications in secure communications. Hyperchaotic systems with multiple positive Lyapunov exponents (LEs) have an advantage over common chaotic systems with only one positive LE. Three different types of hyperchaotic electronic...... oscillators are investigated demonstrating synchronization by means of only one properly selected variable....

V123 Beam Synchronous Encoder Module

International Nuclear Information System (INIS)

Kerner, T.; Conkling, C. R.; Oerter, B.

1999-01-01

The V123 Synchronous Encoder Module transmits events to distributed trigger modules and embedded decoders around the RHIC rings where they are used to provide beam instrumentation triggers [1,2,3]. The RHIC beam synchronous event link hardware is mainly comprised of three VMEbus board designs, the central input modules (V201), and encoder modules (V123), and the distributed trigger modules (V124). Two beam synchronous links, one for each ring, are distributed via fiberoptic and fanned out via twisted wire pair cables. The V123 synchronizes with the RF system clock derived from the beam bucket frequency and a revolution fiducial pulse. The RF system clock is used to create the beam synchronous event link carrier and events are synchronized with the rotation fiducial. A low jitter RF clock is later recovered from this carrier by phase lock loops in the trigger modules. Prioritized hardware and software triggers fill up to 15 beam event code transmission slots per revolution while tracking the ramping RF acceleration frequency and storage frequency. The revolution fiducial event is always the first event transmitted which is used to synchronize the firing of the abort kicker and to locate the first bucket for decoders distributed about the ring

System and method to allow a synchronous motor to successfully synchronize with loads that have high inertia and/or high torque

Science.gov (United States)

Melfi, Michael J.

2015-10-20

A mechanical soft-start type coupling is used as an interface between a line start, synchronous motor and a heavy load to enable the synchronous motor to bring the heavy load up to or near synchronous speed. The soft-start coupling effectively isolates the synchronous motor from the load for enough time to enable the synchronous motor to come up to full speed. The soft-start coupling then brings the load up to or near synchronous speed.

Effects of frustration on explosive synchronization

Science.gov (United States)

Huang, Xia; Gao, Jian; Sun, Yu-Ting; Zheng, Zhi-Gang; Xu, Can

2016-12-01

In this study, we consider the emergence of explosive synchronization in scale-free networks by considering the Kuramoto model of coupled phase oscillators. The natural frequencies of oscillators are assumed to be correlated with their degrees and frustration is included in the system. This assumption can enhance or delay the explosive transition to synchronization. Interestingly, a de-synchronization phenomenon occurs and the type of phase transition is also changed. Furthermore, we provide an analytical treatment based on a star graph, which resembles that obtained in scale-free networks. Finally, a self-consistent approach is implemented to study the de-synchronization regime. Our findings have important implications for controlling synchronization in complex networks because frustration is a controllable parameter in experiments and a discontinuous abrupt phase transition is always dangerous in engineering in the real world.

Grid Synchronization of Wind Turbine Converters under Transient Grid Faults using a Double Synchronous Reference Frame PLL

DEFF Research Database (Denmark)

Teodorescu, Remus; Blaabjerg, Frede; Rodriguez, P.

2008-01-01

This work employs the Double Synchronous Reference Frame PLL (DSRF-PLL) as an effective method for grid synchronization of WT's power converters in the presence of transient faults in the grid. The DSRF-PLL exploits a dual synchronous reference frame voltage characterization, adding a decoupling...... network to a standard SRF-PLL in order to effectively separate the positive- and negative-sequence voltage components in a fast and accurate way. Experimental evaluation of the proposed grid synchronization method and simulations regarding its application to ride through transient faults verify...

40 CFR 93.128 - Traffic signal synchronization projects.

Science.gov (United States)

2010-07-01

... 40 Protection of Environment 20 2010-07-01 2010-07-01 false Traffic signal synchronization... synchronization projects. Traffic signal synchronization projects may be approved, funded, and implemented without... include such regionally significant traffic signal synchronization projects. ...

Utilización del diagnóstico de enfermería, según clasificación de la NANDA, para sistematización de la asistencia de enfermería en la lactancia materna

OpenAIRE

Abrão, Ana Cristina Freitas de Vilhena [UNIFESP; Gutiérrez, Maria Gaby Rivero de [UNIFESP; Marin, Heimar de Fatima [UNIFESP

1997-01-01

Este estudo teve por objetivos descrever a reformulação de um instrumento utilizado na consulta de enfermagem à puérpera, com base na classificação dos diagnósticos de enfermagem, segundo a Taxonomia I-revisada da American Nursing Diagnosis Association - NANDA, e identificar os diagnósticos de enfermagem mais frequentes, relacionados ao aleitamento materno a partir da utilização deste instrumento. Os diagnósticos encontrados em percentuais acima de 50% foram: déficit de conhecimento (100,0%);...

Synchronous machines. General principles and structures; Machines synchrones. Principes generaux et structures

Energy Technology Data Exchange (ETDEWEB)

Ben Ahmed, H.; Feld, G.; Multon, B. [Ecole Normale Superieure de Cachan, Lab. SATIE, Systemes et Applications des Technologies de l' Information et de l' Energie, UMR CNRS 8029, 94 (France); Bernard, N. [Institut Universitaire de Saint-Nazaire, Institut de Recherche en Electrotechnique et Electronique de Nantes Atlantique (IREENA), 44 - Nantes (France)

2005-10-01

Power generation is mainly performed by synchronous rotating machines which consume about a third of the world primary energy. Electric motors used in industrial applications convert about two thirds of this electricity. Therefore, synchronous machines are present everywhere at different scales, from micro-actuators of few micro-watts to thermo-mechanical production units of more than 1 GW, and represent a large variety of structures which have in common the synchronism between the frequency of the power supply currents and the relative movement of the fixed part with respect to the mobile part. Since several decades, these machines are more and more used as variable speed motors with permanent magnets. The advances in power electronics have contributed to the widening of their use in various applications with a huge range of powers. This article presents the general principle of operation of electromechanical converters of synchronous type: 1 - electromechanical conversion in electromagnetic systems: basic laws and elementary structures (elementary structure, energy conversion cycle, case of a system working in linear magnetic regime), rotating fields structure (magneto-motive force and Ferraris theorem, superficial air gap permeance, air gap magnetic induction, case of a permanent magnet inductor, magnetic energy and electromagnetic torque, conditions for reaching a non-null average torque, application to common cases); 2 - constitution, operation modes and efficiency: constitution and main types of synchronous machines, efficiency - analysis by similarity laws (other expression of the electromagnetic torque, thermal limitation in permanent regime, scale effects, effect of pole pairs number, examples of efficiencies and domains of use), operation modes. (J.S.)

Chaos synchronization based on contraction principle

International Nuclear Information System (INIS)

Wang Junwei; Zhou Tianshou

2007-01-01

This paper introduces contraction principle. Based on such a principle, a novel scheme is proposed to synchronize coupled systems with global diffusive coupling. A rigorous sufficient condition on chaos synchronization is derived. As an example, coupled Lorenz systems with nearest-neighbor diffusive coupling are investigated, and numerical simulations are given to validate the proposed synchronization approach

Generalized synchronization in discrete maps. New point of view on weak and strong synchronization

International Nuclear Information System (INIS)

Koronovskii, Alexey A.; Moskalenko, Olga I.; Shurygina, Svetlana A.; Hramov, Alexander E.

2013-01-01

In the present Letter we show that the concept of the generalized synchronization regime in discrete maps needs refining in the same way as it has been done for the flow systems Koronovskii et al. [Koronovskii AA, Moskalenko OI, Hramov AE. Nearest neighbors, phase tubes, and generalized synchronization. Phys Rev E 2011;84:037201]. We have shown that, in the general case, when the relationship between state vectors of the interacting chaotic maps are considered, the prehistory must be taken into account. We extend the phase tube approach to the systems with a discrete time coupled both unidirectionally and mutually and analyze the essence of the generalized synchronization by means of this technique. Obtained results show that the division of the generalized synchronization into the weak and the strong ones also must be reconsidered. Unidirectionally coupled logistic maps and Hénon maps coupled mutually are used as sample systems.

Injuries and medical issues in synchronized Olympic sports.

Science.gov (United States)

Mountjoy, Margo

2009-01-01

Spectators of the Olympic Games can enjoy a wide variety of sports, including strength, team, timed, endurance, and artistic sports. In the Olympic program, there are two synchronized events: synchronized diving and synchronized swimming. The precision of the synchronization of the athlete's movements and skills is an added feature of entertainment. Synchronized athletes have additional training requirements to perfect the synchronization of their skills. The physical demands on the athlete from the repetition of training required for the perfection of synchronization result in injuries unique to these sports. Although both traumatic and overuse injuries occur, overuse injuries are more common. As these disciplines are artistic, judged sports, these athletes also are susceptible to eating disorders and the female athlete triad. This article reviews the training regimen of these athletes and outlines the injuries and health concerns that are common in the synchronized sports.

Diagnóstico molecular para Leishmaniasis

Directory of Open Access Journals (Sweden)

Ysabel Montoya

1997-01-01

Full Text Available El potencial diagnóstico de epitopes inmunodominantes seleccionados fue ensayado satisfactoriamente a fin de obtener una prueba serodiagnóstica alternativa para la Leishmaniasis Tegumentaria Americana. Dos proteínas recombinantes prometedoras de L. (v. peruviana referidas como T-26-U2/T26-U4 fueron reconocidas por sueros individuales de pacientes con Leishmaniasis Tegumentaria Americana usando Western Blot. La sensibilidad de la prueba fue de 86% con sueros permanentes con Leishmaniasis peruana.

Considerações sobre o diagnóstico parasitológico da esquistossomose mansoni

Directory of Open Access Journals (Sweden)

Celso Affonso de Oliveira

1967-02-01

Full Text Available O autor tece comentários sobre o valor do exame parasitológico das fezes anterior a qualquer tratamento para o diagnóstico da esquistossomose mansoni, acentuando que a sua positividade traduz sempre infecção esquistossomótica e parasitose ativa. Considera, a seguir, o valor da biópsia retal, mostrando que êste método evidencia a infecção em 95% dos casos portadores da forma intestinal e em 75% daqueles com esquistossomose hepatoesplênica; o exame coprológico é, portanto, superior para o diagnóstico da forma hepatoesplênica. O encontro exclusivo de ovos mortos e/ou granulomas e/ou cascas firma o diagnóstico da infecção.

Traffic signal synchronization.

Science.gov (United States)

Huang, Ding-wei; Huang, Wei-neng

2003-05-01

The benefits of traffic signal synchronization are examined within the cellular automata approach. The microsimulations of traffic flow are obtained with different settings of signal period T and time delay delta. Both numerical results and analytical approximations are presented. For undersaturated traffic, the green-light wave solutions can be realized. For saturated traffic, the correlation among the traffic signals has no effect on the throughput. For oversaturated traffic, the benefits of synchronization are manifest only when stochastic noise is suppressed.

Injuries in synchronized skating.

Science.gov (United States)

Dubravcic-Simunjak, S; Kuipers, H; Moran, J; Simunjak, B; Pecina, M

2006-06-01

Synchronized skating is a relatively new competitive sport and data about injuries in this discipline are lacking. Therefore the purpose of this study was to investigate the frequency and pattern of acute and overuse injuries in synchronized skaters. Before and during the World Synchronized Skating Championship 2004, a questionnaire inquiring about the frequency of injuries in this skating discipline was given to 23 participating teams. A total of 514 women and 14 men senior skaters completed the questionnaires (100 % response). Two hundred and eighteen (42.4 %) female and 6 (42.9 %) male skaters had suffered from acute injuries during their synchronized skating career. As some skaters had suffered from more than one injury, the total number of acute injuries in females was 398 and in males 14. In female skaters 19.8 % of acute injuries were head injuries, 7.1 % trunk, 33.2 % upper, and 39.9 % lower extremity injuries. In male skaters 14.3 % were head injuries, 28.6 % upper, and 57.1 % lower extremity injuries, with no report of trunk injuries. Sixty-nine female and 2 male skaters had low back problems and 112 female and 2 male skaters had one or more overuse syndromes during their skating career. Of 155 overuse injuries in female skaters, 102 (65.8 %) occurred during their figure skating career, while 53 injuries (34.2 %) only occurred when they skated in synchronized skating teams. In male skaters, out of 5 overuse injuries, 4 (80 %) occurred in their figure skating career, while 1 (20 %) occurred during their synchronized skating career. Out of the total of 412 injuries, 338 (82 %) occurred during on-ice practice, while 74 (18 %) happened during off-ice training. Ninety-one (26.9 %) acute injures occurred while practicing individual elements, and 247 (73.1 %) on-ice injuries occurred while practicing different team elements. We conclude that injuries in synchronized skating should be of medical concern due to an increasing number of acute injuries, especially

Measures of Quantum Synchronization in Continuous Variable Systems

Science.gov (United States)

Mari, A.; Farace, A.; Didier, N.; Giovannetti, V.; Fazio, R.

2013-09-01

We introduce and characterize two different measures which quantify the level of synchronization of coupled continuous variable quantum systems. The two measures allow us to extend to the quantum domain the notions of complete and phase synchronization. The Heisenberg principle sets a universal bound to complete synchronization. The measure of phase synchronization is, in principle, unbounded; however, in the absence of quantum resources (e.g., squeezing) the synchronization level is bounded below a certain threshold. We elucidate some interesting connections between entanglement and synchronization and, finally, discuss an application based on quantum optomechanical systems.

Nonlinearity induced synchronization enhancement in mechanical oscillators

Science.gov (United States)

Czaplewski, David A.; Lopez, Omar; Guest, Jeffrey R.; Antonio, Dario; Arroyo, Sebastian I.; Zanette, Damian H.

2018-05-08

An autonomous oscillator synchronizes to an external harmonic force only when the forcing frequency lies within a certain interval, known as the synchronization range, around the oscillator's natural frequency. Under ordinary conditions, the width of the synchronization range decreases when the oscillation amplitude grows, which constrains synchronized motion of micro- and nano-mechanical resonators to narrow frequency and amplitude bounds. The present invention shows that nonlinearity in the oscillator can be exploited to manifest a regime where the synchronization range increases with an increasing oscillation amplitude. The present invention shows that nonlinearities in specific configurations of oscillator systems, as described herein, are the key determinants of the effect. The present invention presents a new configuration and operation regime that enhances the synchronization of micro- and nano-mechanical oscillators by capitalizing on their intrinsic nonlinear dynamics.

Adaptive H∞ Chaos Anti-synchronization

International Nuclear Information System (INIS)

Ahn, Choon Ki

2010-01-01

A new adaptive H ∞ anti-synchronization (AHAS) method is proposed for chaotic systems in the presence of unknown parameters and external disturbances. Based on the Lyapunov theory and linear matrix inequality formulation, the AHAS controller with adaptive laws of unknown parameters is derived to not only guarantee adaptive anti-synchronization but also reduce the effect of external disturbances to an H ∞ norm constraint. As an application of the proposed AHAS method, the H ∞ anti-synchronization problem for Genesio–Tesi chaotic systems is investigated. (general)

Beat Synchronization across the Lifespan: Intersection of Development and Musical Experience.

Directory of Open Access Journals (Sweden)

Elaine C Thompson

Full Text Available Rhythmic entrainment, or beat synchronization, provides an opportunity to understand how multiple systems operate together to integrate sensory-motor information. Also, synchronization is an essential component of musical performance that may be enhanced through musical training. Investigations of rhythmic entrainment have revealed a developmental trajectory across the lifespan, showing synchronization improves with age and musical experience. Here, we explore the development and maintenance of synchronization in childhood through older adulthood in a large cohort of participants (N = 145, and also ask how it may be altered by musical experience. We employed a uniform assessment of beat synchronization for all participants and compared performance developmentally and between individuals with and without musical experience. We show that the ability to consistently tap along to a beat improves with age into adulthood, yet in older adulthood tapping performance becomes more variable. Also, from childhood into young adulthood, individuals are able to tap increasingly close to the beat (i.e., asynchronies decline with age, however, this trend reverses from younger into older adulthood. There is a positive association between proportion of life spent playing music and tapping performance, which suggests a link between musical experience and auditory-motor integration. These results are broadly consistent with previous investigations into the development of beat synchronization across the lifespan, and thus complement existing studies and present new insights offered by a different, large cross-sectional sample.

Vestibular hearing and neural synchronization.

Science.gov (United States)

Emami, Seyede Faranak; Daneshi, Ahmad

2012-01-01

Objectives. Vestibular hearing as an auditory sensitivity of the saccule in the human ear is revealed by cervical vestibular evoked myogenic potentials (cVEMPs). The range of the vestibular hearing lies in the low frequency. Also, the amplitude of an auditory brainstem response component depends on the amount of synchronized neural activity, and the auditory nerve fibers' responses have the best synchronization with the low frequency. Thus, the aim of this study was to investigate correlation between vestibular hearing using cVEMPs and neural synchronization via slow wave Auditory Brainstem Responses (sABR). Study Design. This case-control survey was consisted of twenty-two dizzy patients, compared to twenty healthy controls. Methods. Intervention comprised of Pure Tone Audiometry (PTA), Impedance acoustic metry (IA), Videonystagmography (VNG), fast wave ABR (fABR), sABR, and cVEMPs. Results. The affected ears of the dizzy patients had the abnormal findings of cVEMPs (insecure vestibular hearing) and the abnormal findings of sABR (decreased neural synchronization). Comparison of the cVEMPs at affected ears versus unaffected ears and the normal persons revealed significant differences (P < 0.05). Conclusion. Safe vestibular hearing was effective in the improvement of the neural synchronization.

Imunodeficiência Combinada Grave – O Diagnóstico Precoce é Importante?

OpenAIRE

Simão, I; Valente, R; Farela Neves, J; Neves, C

2011-01-01

Introdução: Os doentes com Imunodeficiência Combinada Grave (SCID) não diagnosticados evoluem inexoravelmente para a morte no primeiro ano de vida. Um elevado índice de suspeição é fundamental para o diagnóstico precoce, o factor mais importante para a sobrevida destas crianças. Objectivo: Apresentam-se três casos clínicos ilustrativos da importância da precocidade diagnóstica no prognóstico final. Casos clínicos: Caso clínico 1: Lactente do sexo masculino, com antecedentes de inf...

Monitores de diagnóstico em Mamografia : (Os 5MP em Portugal)

OpenAIRE

Timóteo, Maria Teresa

2012-01-01

O carcinoma da mama é o mais comum nas mulheres, em Portugal morrem cerca de 1500 mulheres por ano devido a esta patologia. Serviu o presente estudo para investigar se os Hospitais da Região de Lisboa e Vale do Tejo estão equipados, com monitores de diagnóstico em mamografia, que correspondam com as guidelines europeias. O serviço de Mamografia, em Portugal rege-se por estas guidelines, em que é referenciado que para um correcto diagnóstico, com toda a sensibilidade e especific...

Synchronous activity in cat visual cortex encodes collinear and cocircular contours.

Science.gov (United States)

Samonds, Jason M; Zhou, Zhiyi; Bernard, Melanie R; Bonds, A B

2006-04-01

We explored how contour information in primary visual cortex might be embedded in the simultaneous activity of multiple cells recorded with a 100-electrode array. Synchronous activity in cat visual cortex was more selective and predictable in discriminating between drifting grating and concentric ring stimuli than changes in firing rate. Synchrony was found even between cells with wholly different orientation preferences when their receptive fields were circularly aligned, and membership in synchronous groups was orientation and curvature dependent. The existence of synchrony between cocircular cells reinforces its role as a general mechanism for contour integration and shape detection as predicted by association field concepts. Our data suggest that cortical synchrony results from common and synchronous input from earlier visual areas and that it could serve to shape extrastriate response selectivity.

Factores que retardan el diagnóstico y el tratamiento de la malaria en el municipio de Riberalta en Bolivia

Directory of Open Access Journals (Sweden)

Arletta Añez

2012-04-01

Conclusión. Existe un retardo en el diagnóstico de la malaria, lo cual es influenciado por factores como el lugar de infección, lugar del diagnóstico, nivel de atención, especie parasitaria y método de diagnóstico.

Ultrassonografia no diagnóstico da tendinite e eletroneuromiografia no diagnóstico da neuropatia periférica e da radiculopatia do membro superior – visão do reumatologista

OpenAIRE

Helfenstein Jr., Milton; Ferreira, Mario Soares; Assad Maia, Anna Beatriz; Fávaro Siena, César Augusto; Techy, Antonio

2013-01-01

OBJETIVO: Averiguar o valor que os reumatologistas brasileiros conferem ao exame de ultrassonografia para o diagnóstico de tendinite e ao exame de eletroneuromiografia para o diagnóstico da neuropatia periférica e da radiculopatia dos membros superiores. MATERIAL E MÉTODOS: No total, 165 reumatologistas responderam a uma pesquisa de opinião anônima (enviada pela internet), sobre diversas situações relativas aos dois exames, no que diz respeito aos seguintes questionamentos: confiabilidade, pr...

Synchronization in complex networks with switching topology

International Nuclear Information System (INIS)

Wang, Lei; Wang, Qing-guo

2011-01-01

This Letter investigates synchronization issues of complex dynamical networks with switching topology. By constructing a common Lyapunov function, we show that local and global synchronization for a linearly coupled network with switching topology can be evaluated by the time average of second smallest eigenvalues corresponding to the Laplacians of switching topology. This result is quite powerful and can be further used to explore various switching cases for complex dynamical networks. Numerical simulations illustrate the effectiveness of the obtained results in the end. -- Highlights: → Synchronization of complex networks with switching topology is investigated. → A common Lyapunov function is established for synchronization of switching network. → The common Lyapunov function is not necessary to monotonically decrease with time. → Synchronization is determined by the second smallest eigenvalue of its Laplacian. → Synchronization criterion can be used to investigate various switching cases.

Three types of generalized synchronization

Energy Technology Data Exchange (ETDEWEB)

Yang Junzhong [School of Science, Beijing University of Posts and Telecomunications, Beijing 100876 (China)]. E-mail: jzyang@bupt.edu.cn; Hu Gang [China Center for Advanced Science and Technology (CCAST) (World Laboratory), PO Box 8730, Beijing 100080 (China) and Department of Physics, Beijing Normal University, Beijing 100875 (China)]. E-mail: ganghu@bnu.edu.cn

2007-02-05

The roles played by drive and response systems on generalized chaos synchronization (GS) are studied. And the generalized synchronization is classified, based on these roles, to three distinctive types: the passive GS which is mainly determined by the response system and insensitive to the driving signal; the resonant GS where phase synchronization between the drive and response systems is preceding GS; and the interacting GS where both the drive and response have influences on the status of GS. The features of these GS types and the possible changes from one types to others are investigated.

Three types of generalized synchronization

International Nuclear Information System (INIS)

Yang Junzhong; Hu Gang

2007-01-01

The roles played by drive and response systems on generalized chaos synchronization (GS) are studied. And the generalized synchronization is classified, based on these roles, to three distinctive types: the passive GS which is mainly determined by the response system and insensitive to the driving signal; the resonant GS where phase synchronization between the drive and response systems is preceding GS; and the interacting GS where both the drive and response have influences on the status of GS. The features of these GS types and the possible changes from one types to others are investigated

Synchronous Half-Wave Rectifier

Science.gov (United States)

Rippel, Wally E.

1989-01-01

Synchronous rectifying circuit behaves like diode having unusually low voltage drop during forward-voltage half cycles. Circuit particularly useful in power supplies with potentials of 5 Vdc or less, where normal forward-voltage drops in ordinary diodes unacceptably large. Fabricated as monolithic assembly or as hybrid. Synchronous half-wave rectifier includes active circuits to attain low forward voltage drop and high rectification efficiency.

Machine Translation Using Constraint-Based Synchronous Grammar

Institute of Scientific and Technical Information of China (English)

WONG Fai; DONG Mingchui; HU Dongcheng

2006-01-01

A synchronous grammar based on the formalism of context-free grammar was developed by generalizing the first component of production that models the source text. Unlike other synchronous grammars,the grammar allows multiple target productions to be associated to a single production rule which can be used to guide a parser to infer different possible translational equivalences for a recognized input string according to the feature constraints of symbols in the pattern. An extended generalized LR algorithm was adapted to the parsing of the proposed formalism to analyze the syntactic structure of a language. The grammar was used as the basis for building a machine translation system for Portuguese to Chinese translation. The empirical results show that the grammar is more expressive when modeling the translational equivalences of parallel texts for machine translation and grammar rewriting applications.

Introduction to media synchronization (Mediasync)

NARCIS (Netherlands)

M.A. Montagud Climent (Mario); P.S. Cesar Garcia (Pablo Santiago); F. Boronat (Fernando); A.J. Jansen (Jack)

2018-01-01

textabstractMedia synchronization is a core research area in multimedia systems. This chapter introduces the area by providing key definitions, classifications, and examples. It also discusses the relevance of different types of media synchronization to ensure satisfactory Quality of Experience

Synchronous Adenocarcinoma of the Colon and Rectal Carcinoid

Directory of Open Access Journals (Sweden)

Vamshidhar Vootla

2016-10-01

Full Text Available Primary colonic adenocarcinoma and synchronous rectal carcinoids are rare tumors. Whenever a synchronous tumor with a nonmetastatic carcinoid component is encountered, its prognosis is determined by the associate malignancy. The discovery of an asymptomatic gastrointestinal carcinoid during the operative treatment of another malignancy will usually only require resection without additional treatment and will have little effect on the prognosis of the individual. This article reports a synchronous rectal carcinoid in a patient with hepatic flexure adenocarcinoma. We present a case of a 46-year-old Hispanic woman with a history of hypothyroidism, uterine fibroids and hypercholesterolemia presenting with a 2-week history of intermittent abdominal pain, mainly in the right upper quadrant. She had no family history of cancers. Physical examination was significant for pallor. Laboratory findings showed microcytic anemia with a hemoglobin of 6.6 g/dl. CT abdomen showed circumferential wall thickening in the ascending colon near the hepatic flexure and pulmonary nodules. Colonoscopy showed hepatic flexure mass and rectal nodule which were biopsied. Pathology showed a moderately differentiated invasive adenocarcinoma of the colon (hepatic flexure mass and a low-grade neuroendocrine neoplasm (carcinoid of rectum. The patient underwent laparoscopic right hemicolectomy and chemotherapy. In patients diagnosed with adenocarcinoma of the colon and rectum, carcinoids could be missed due to their submucosal location, multicentricity and indolent growth pattern. Studies suggest a closer surveillance of the GI tract for noncarcinoid synchronous malignancy when a carcinoid tumor is detected and vice versa.

Diagnósticos de enfermagem de idosos que utilizam múltiplos medicamentos Diagnósticos de enfermería de ancianos polimedicados Nursing diagnoses of elderly patients using multiple drugs

Directory of Open Access Journals (Sweden)

Maria José Sanches Marin

2010-03-01

Full Text Available Considerando que os idosos que utilizam múltiplos medicamentos são propensos à maior vulnerabilidade nas condições de saúde, propomo-nos, neste estudo: identificar os diagnósticos de enfermagem, segundo a taxonomia II de NANDA, de um grupo de idosos que utilizam cinco ou mais medicamentos. Foram selecionados 67 idosos, a partir da Avaliação Geriátrica Ampla (AGA entre 301 residentes na área de abrangência de um Programa de Saúde da Família (PSF. Os 67 idosos apresentaram 16 categorias diagnósticas, em média 5,2 diagnósticos/idoso, sendo os mais frequentes a dor crônica, presente em 59,7% dos idosos; 58,2% têm a mobilidade física prejudicada; 47,7%, nutrição desequilibrada (mais que as necessidades corporais, e 47,7% têm um controle ineficaz do regime terapêutico. Tais diagnósticos revelam a necessidade de medidas envolvendo mudanças no estilo de vida, além do acompanhamento sistemático dessas pessoas.Considerando que los ancianos que utilizan múltiples medicamentos son propensos a una mayor vulnerabilidad en sus condiciones de salud, nos proponemos en este estudio identificar los diagnósticos de enfermería según la taxonomía II de NANDA, de un grupo de ancianos que utilizan cinco o más medicamentos. Fueron seleccionados 67 ancianos, a partir de la Avaliação Geriátrica Ampla (AGA, entre 301 residentes en el área comprendida por un Programa de Salud Familiar (PSF. Los 67 ancianos presentaron 16 categorías diagnósticas, con una media de 5,2 diagnósticos/anciano, siendo los más frecuentes el dolor crónico (afectando a un 59,7%, la movilidad física reducida (58,2%, nutrición desequilibrada -por encima de las necesidades corporales- (47,7% y control ineficaz del régimen terapéutico (47,7%. Tales diagnósticos determinan la necesidad de medidas que implican cambios sustanciales en el estilo de vida, además del seguimiento médico sistemático de dichas personas.Considering that elderly people using

Síndrome de Cushing: é possível simplificar e padronizar sua abordagem diagnóstica?

OpenAIRE

Rollin, Guilherme A.F.S.; Czepielewski, Mauro A.

2003-01-01

A síndrome de Cushing representa um desafio diagnóstico, requerendo suspeita clínica apurada, conhecimento adequado da regulação hormonal do eixo hipotálamo-hipófise-adrenal, aplicação precisa de testes funcionais que estimulam ou inibem este eixo e a indicação de exames de imagem resolutivos para as diversas etiologias investigadas. Neste artigo, discutimos a abordagem diagnóstica da síndrome de Cushing, analisando a aplicação dos diversos testes utilizados tanto para o diagnóstico sindrômic...

Inter-subject synchronization of brain responses during natural music listening

Science.gov (United States)

Abrams, Daniel A.; Ryali, Srikanth; Chen, Tianwen; Chordia, Parag; Khouzam, Amirah; Levitin, Daniel J.; Menon, Vinod

2015-01-01

Music is a cultural universal and a rich part of the human experience. However, little is known about common brain systems that support the processing and integration of extended, naturalistic ‘real-world’ music stimuli. We examined this question by presenting extended excerpts of symphonic music, and two pseudomusical stimuli in which the temporal and spectral structure of the Natural Music condition were disrupted, to non-musician participants undergoing functional brain imaging and analysing synchronized spatiotemporal activity patterns between listeners. We found that music synchronizes brain responses across listeners in bilateral auditory midbrain and thalamus, primary auditory and auditory association cortex, right-lateralized structures in frontal and parietal cortex, and motor planning regions of the brain. These effects were greater for natural music compared to the pseudo-musical control conditions. Remarkably, inter-subject synchronization in the inferior colliculus and medial geniculate nucleus was also greater for the natural music condition, indicating that synchronization at these early stages of auditory processing is not simply driven by spectro-temporal features of the stimulus. Increased synchronization during music listening was also evident in a right-hemisphere fronto-parietal attention network and bilateral cortical regions involved in motor planning. While these brain structures have previously been implicated in various aspects of musical processing, our results are the first to show that these regions track structural elements of a musical stimulus over extended time periods lasting minutes. Our results show that a hierarchical distributed network is synchronized between individuals during the processing of extended musical sequences, and provide new insight into the temporal integration of complex and biologically salient auditory sequences. PMID:23578016

Robust synchronization of chaotic systems via feedback

Energy Technology Data Exchange (ETDEWEB)

Femat, Ricardo [IPICYT, San Luis Potosi (Mexico). Dept. de Matematicas Aplicadas; Solis-Perales, Gualberto [Universidad de Guadalajara, Centro Univ. de Ciencias Exactas e Ingenierias (Mexico). Div. de Electronica y Computacion

2008-07-01

This volume includes the results derived during last ten years about both suppression and synchronization of chaotic -continuous time- systems. Along this time, the concept was to study how the intrinsic properties of dynamical systems can be exploited to suppress and to synchronize the chaotic behaviour and what synchronization phenomena can be found under feedback interconnection. A compilation of these findings is described in this book. This book shows a perspective on synchronization of chaotic systems. (orig.)

Synchronization of ;light-sensitive; Hindmarsh-Rose neurons

Science.gov (United States)

Castanedo-Guerra, Isaac; Steur, Erik; Nijmeijer, Henk

2018-04-01

The suprachiasmatic nucleus is a network of synchronized neurons whose electrical activity follows a 24 h cycle. The synchronization phenomenon (among these neurons) is not completely understood. In this work we study, via experiments and numerical simulations, the phenomenon in which the synchronization threshold changes under the influence of an external (bifurcation) parameter in coupled Hindmarsh-Rose neurons. This parameter ;shapes; the activity of the individual neurons the same way as some neurons in the brain react to light. We corroborate this experimental finding with numerical simulations by quantifying the amount of synchronization using Pearson's correlation coefficient. In order to address the local stability problem of the synchronous state, Floquet theory is applied in the case where the dynamic systems show continuous periodic solutions. These results show how the sufficient coupling strength for synchronization between these neurons is affected by an external cue (e.g. light).

Distributed Synchronization in Communication Networks

Science.gov (United States)

2018-01-24

synchronization. Secondly, it is known that identical oscillators with sin() coupling functions are guaranteed to synchronize in phase on a complete...provide sufficient conditions for phase- locking , i.e., convergence to a stable equilibrium almost surely. We additionally find conditions when the

Synchronization of coupled metronomes on two layers

Science.gov (United States)

Zhang, Jing; Yu, Yi-Zhen; Wang, Xin-Gang

2017-12-01

Coupled metronomes serve as a paradigmatic model for exploring the collective behaviors of complex dynamical systems, as well as a classical setup for classroom demonstrations of synchronization phenomena. Whereas previous studies of metronome synchronization have been concentrating on symmetric coupling schemes, here we consider the asymmetric case by adopting the scheme of layered metronomes. Specifically, we place two metronomes on each layer, and couple two layers by placing one on top of the other. By varying the initial conditions of the metronomes and adjusting the friction between the two layers, a variety of synchronous patterns are observed in experiment, including the splay synchronization (SS) state, the generalized splay synchronization (GSS) state, the anti-phase synchronization (APS) state, the in-phase delay synchronization (IPDS) state, and the in-phase synchronization (IPS) state. In particular, the IPDS state, in which the metronomes on each layer are synchronized in phase but are of a constant phase delay to metronomes on the other layer, is observed for the first time. In addition, a new technique based on audio signals is proposed for pattern detection, which is more convenient and easier to apply than the existing acquisition techniques. Furthermore, a theoretical model is developed to explain the experimental observations, and is employed to explore the dynamical properties of the patterns, including the basin distributions and the pattern transitions. Our study sheds new lights on the collective behaviors of coupled metronomes, and the developed setup can be used in the classroom for demonstration purposes.

Chaos synchronization based on intermittent state observer

Institute of Scientific and Technical Information of China (English)

Li Guo-Hui; Zhou Shi-Ping; Xu De-Ming

2004-01-01

This paper describes the method of synchronizing slave to the master trajectory using an intermittent state observer by constructing a synchronizer which drives the response system globally tracing the driving system asymptotically. It has been shown from the theory of synchronization error-analysis that a satisfactory result of chaos synchronization is expected under an appropriate intermittent period and state observer. Compared with continuous control method,the proposed intermittent method can target the desired orbit more efficiently. The application of the method is demonstrated on the hyperchaotic Rossler systems. Numerical simulations show that the length of the synchronization interval rs is of crucial importance for our scheme, and the method is robust with respect to parameter mismatch.

Nursing diagnoses related to skin: operational definitions Diagnósticos de enfermería relacionados a la piel: definiciones operacionales Diagnósticos de enfermagem relacionados à pele: definições operacionais

Directory of Open Access Journals (Sweden)

Maria Andréia Silva Ribeiro

2012-10-01

Full Text Available OBJECTIVE: to validate the operational definitions of the defining characteristics and risk factors of the three NANDA International (NANDA-I nursing diagnoses and to revise these diagnoses' definitions. METHOD: content validation of nursing diagnosis. 146 defining characteristics and risk factors were identified in the literature in Brazilian and international databases. This was followed by content validation of the definitions of these diagnoses (presented by NANDA-I and of the operational definitions (developed by the researchers of the defining characteristics and risk factors, carried out by six expert nurses, regarding relevance, clarity and comprehensiveness. RESULT: of the 146 defining characteristics and risk factors, 22 were considered redundant and were excluded. The experts proposed changing the definitions of the diagnoses of Impaired Tissue Integrity and Risk for Impaired Skin Integrity. It was possible to identify various defining characteristics and risk factors which are not present in the NANDA-I taxonomy but which are indicated in the literature. CONCLUSION: the process attained its objective of producing valid operational definitions for defining characteristics and risk factors, which will permit the undertaking of validation studies for these diagnoses. The study's contribution to advancing scientific knowledge consists in its presenting clearer operational definitions for these diagnoses and a higher number of defining characteristics and risk factors, which will assist the nurses in the identification and use of the same with greater accuracy in clinical practice.OBJETIVO: validar las definiciones operacionales de las características definidoras y factores de riesgo de los tres diagnósticos de enfermería relacionados a la piel de la NANDA International (NANDA-I y revisar las definiciones de eses diagnósticos. MÉTODO: validación de contenido de diagnóstico de enfermería. Se identificaron 146 caracter

Neuropareidolia: diagnostic clues apropos of visual illusions Neuropareidolia: pista diagnóstica a partir de uma ilusão visual

Directory of Open Access Journals (Sweden)

Péricles Maranhão-Filho

2009-12-01

Full Text Available Diagnosis in neuroimaging involves the recognition of specific patterns indicative of particular diseases. Pareidolia, the misperception of vague or obscure stimuli being perceived as something clear and distinct, is somewhat beneficial for the physician in the pursuit of diagnostic strategies. Animals may be pareidolically recognized in neuroimages according to the presence of specific diseases. By associating a given radiological aspect with an animal, doctors improve their diagnostic skills and reinforce mnemonic strategies in radiology practice. The most important pareidolical perceptions of animals in neuroimaging are the hummingbird sign in progressive supranuclear palsy, the panda sign in Wilson's disease, the panda sign in sarcoidosis, the butterfly sign in glioblastomas, the butterfly sign in progressive scoliosis and horizontal gaze palsy, the elephant sign in Alzheimer's disease and the eye-of-the-tiger sign in pantothenate kinase-associated neurodegenerative disease.O diagnóstico em neuroimagem envolve o reconhecimento de padrões específicos indicativos de doenças particulares. Pareidolia, é a perceção equivocada de algo claro e distinto a partir de um estímulo vago e obscuro, por vezes benéfico a quem interpreta exames de imagem na procura do diagnóstico. A este propósito, alguns animais podem pareidolicamente ser reconhecidos em neuroimagens associadas a determinadas doenças específicas, promovendo mais rapidez na habilidade diagnóstica e naturalmente reforçando estratégias mnemônicas individuais na prática do diagnóstico neuroradiológico. Alguns dos sinais de neuroimagens relacionados a percepções pareidolicas de animais são: o sinal do beja-flor na paralisia supra nuclear progressiva; o sinal do panda na doença de Wilson; o sinal do panda na sarcoisdose; o sinal da borboleta no glioblastoma; o sinal da borboleta no escoliose progressiva e paralisia do olhar horizontal; o sinal do elefante na doença de

Processo de enfermagem informatizado: metodologia para associação da avaliação clínica, diagnósticos, intervenções e resultados Proceso de enfermería informatizado: metodología para asociación de la evaluación clínica, diagnósticos, intervenciones y resultados Computerized nursing process: methodology to establish associations between clinical assessment, diagnosis, interventions, and outcomes

Directory of Open Access Journals (Sweden)

Grace Teresinha Marcon Dal Sasso

2013-02-01

Full Text Available O Processo de Enfermagem é uma tecnologia do cuidado que orienta a sequência do raciocínio clínico e melhora a qualidade do cuidado. Este artigo trata-se do relato do desenvolvimento de um Processo de Enfermagem Informatizado (PEI para Unidade de Terapia Intensiva. O presente estudo foi desenvolvido em três principais etapas: discussão e compreensão da norma International Organization for Standard 18.104; aprofundamento teórico sobre a CIPE® 1.0; associação das informações aos diagnósticos e intervenções de Enfermagem. A base do conhecimento foi organizada segundo a CIPE® Versão 1.0. O resultado foi a reestruturação do PEI a partir da associação das avaliações clínicas aos diagnósticos e intervenções que permitem documentar a prática clínica de enfermagem, além de fornecerem apoio para a tomada de decisão. As etapas metodológicas empregadas permitiram fazer a associação entre a avaliação clínica, os diagnósticos, as intervenções e os resultados da CIPE® 1.0 com a ISO 18.104.El Proceso de Enfermería es una tecnología que orienta la secuencia del razonamiento clínico y mejora la calidad del cuidado. Este artículo relata el desarrollo de un Proceso de Enfermería Informatizado (PEI para Unidad de Terapia Intensiva. El estudio se desarrolló en tres etapas principales: discusión y comprensión de la norma International Organization for Standardization 18.104; profundización teórica de la CIPE® 1.0; asociación de las informaciones a los diagnósticos e intervenciones de Enfermería. La base del conocimiento se organizó según CIPE® 1.0. El resultado fue la reestructuración del PEI a partir de la asociación de las evaluaciones clínicas a los diagnósticos e intervenciones que permite documentar la práctica clínica de enfermería, además de brindar respaldo para la toma de decisiones. Las etapas metodológicas empleadas permitieron hacer la asociación entre la evaluación clínica, los diagn

Caso para diagnóstico Case for diagnosis

Directory of Open Access Journals (Sweden)

Patricia Erica Christofoletti Daldon

2010-10-01

Full Text Available Paciente do sexo masculino, negro, 13 anos, apresenta há dois anos lesões pruriginosas, pápulonodulares nos antebraços, associadas a edema do lábio inferior, fotofobia, conjuntivite e pterígio. O exame histopatológico do lábio inferior revelou acantose, espongiose e infiltrado inflamatório perivascular superficial, composto por linfócitos, plasmócitos e eosinófilos, compatível com o diagnóstico de prurigo actínico. As lesões regrediram com o uso de talidomida 100 mg/dia.A 13-year-old black boy had pruritic papular and nodular lesions on his forearms associated to edema of the lower lip, photophobia, conjunctivitis and pterygium. Skin biopsy of the lower lip revealed acanthosis, spongiosis with dermal perivascular mononuclear cell infiltration composed by lymphocytes, plasma cells and eosinophils consistent with actinic prurigo. Lesions improved considerably with the use of thalidomide 100mg/ day.

Synchronization of Coupled Neurons Controlled by a Pacemaker

International Nuclear Information System (INIS)

Li Mei-Sheng; Zhang Hong-Hui; Zhao Yong; Shi Xia

2011-01-01

We investigate synchronization of Hindmarsh—Rose neurons with gap junctions under the control of a pacemaker. In a ring Hindmarsh—Rose neuronal network, the coupled neurons with the pacemaker can occur in synchronization more easily than those without the pacemaker. Furthermore, the pacemaker can induce phase synchronization or nearly-complete synchronization of nonidentical neurons. This synchronization can occur more easily when time delay is considered. Theses results can be helpful to understand the activities of the real neuronal system. (general)

Small-world networks exhibit pronounced intermittent synchronization

Science.gov (United States)

Choudhary, Anshul; Mitra, Chiranjit; Kohar, Vivek; Sinha, Sudeshna; Kurths, Jürgen

2017-11-01

We report the phenomenon of temporally intermittently synchronized and desynchronized dynamics in Watts-Strogatz networks of chaotic Rössler oscillators. We consider topologies for which the master stability function (MSF) predicts stable synchronized behaviour, as the rewiring probability (p) is tuned from 0 to 1. MSF essentially utilizes the largest non-zero Lyapunov exponent transversal to the synchronization manifold in making stability considerations, thereby ignoring the other Lyapunov exponents. However, for an N-node networked dynamical system, we observe that the difference in its Lyapunov spectra (corresponding to the N - 1 directions transversal to the synchronization manifold) is crucial and serves as an indicator of the presence of intermittently synchronized behaviour. In addition to the linear stability-based (MSF) analysis, we further provide global stability estimate in terms of the fraction of state-space volume shared by the intermittently synchronized state, as p is varied from 0 to 1. This fraction becomes appreciably large in the small-world regime, which is surprising, since this limit has been otherwise considered optimal for synchronized dynamics. Finally, we characterize the nature of the observed intermittency and its dominance in state-space as network rewiring probability (p) is varied.

Global chaos synchronization with channel time-delay

International Nuclear Information System (INIS)

Jiang Guoping; Zheng Weixing; Chen Guanrong

2004-01-01

This paper addresses a practical issue in chaos synchronization where there is a time-delay in the receiver as compared with the transmitter. A new synchronization scheme and a general criterion for global chaos synchronization are proposed and developed from the approach of unidirectional linear error feedback coupling with time-delay. The chaotic Chua's circuit is used for illustration, where the coupling parameters are determined according to the criterion under which the global chaos synchronization of the time-delay coupled systems is achieved

Global chaos synchronization of coupled parametrically excited ...

Indian Academy of Sciences (India)

In this paper, we study the synchronization behaviour of two linearly coupled parametrically excited chaotic pendula. The stability of the synchronized state is examined using Lyapunov stability theory and linear matrix inequality (LMI); and some sufficient criteria for global asymptotic synchronization are derived from which ...

A network of networks model to study phase synchronization using structural connection matrix of human brain

Science.gov (United States)

Ferrari, F. A. S.; Viana, R. L.; Reis, A. S.; Iarosz, K. C.; Caldas, I. L.; Batista, A. M.

2018-04-01

The cerebral cortex plays a key role in complex cortical functions. It can be divided into areas according to their function (motor, sensory and association areas). In this paper, the cerebral cortex is described as a network of networks (cortex network), we consider that each cortical area is composed of a network with small-world property (cortical network). The neurons are assumed to have bursting properties with the dynamics described by the Rulkov model. We study the phase synchronization of the cortex network and the cortical networks. In our simulations, we verify that synchronization in cortex network is not homogeneous. Besides, we focus on the suppression of neural phase synchronization. Synchronization can be related to undesired and pathological abnormal rhythms in the brain. For this reason, we consider the delayed feedback control to suppress the synchronization. We show that delayed feedback control is efficient to suppress synchronous behavior in our network model when an appropriate signal intensity and time delay are defined.

Full state hybrid projective synchronization in hyperchaotic systems

International Nuclear Information System (INIS)

Chu Yandong; Chang Yingxiang; Zhang Jiangang; Li Xianfeng; An Xinlei

2009-01-01

In this letter, we investigate the full state hybrid projective synchronization (FSHPS) which includes complete synchronization, anti-synchronization and projective synchronization as its special items. Based on Lyapunov stability theory a controller can be designed for achieving the FSHPS of hyperchaotic systems. Numerical simulations are provided to verify the effectiveness of the proposed scheme.

Synchronizing noisy nonidentical oscillators by transient uncoupling

Energy Technology Data Exchange (ETDEWEB)

Tandon, Aditya, E-mail: adityat@iitk.ac.in; Mannattil, Manu, E-mail: mmanu@iitk.ac.in [Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016 (India); Schröder, Malte, E-mail: malte@nld.ds.mpg.de [Network Dynamics, Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen (Germany); Timme, Marc, E-mail: timme@nld.ds.mpg.de [Network Dynamics, Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen (Germany); Department of Physics, Technical University of Darmstadt, 64289 Darmstadt (Germany); Chakraborty, Sagar, E-mail: sagarc@iitk.ac.in [Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016 (India); Mechanics and Applied Mathematics Group, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016 (India)

2016-09-15

Synchronization is the process of achieving identical dynamics among coupled identical units. If the units are different from each other, their dynamics cannot become identical; yet, after transients, there may emerge a functional relationship between them—a phenomenon termed “generalized synchronization.” Here, we show that the concept of transient uncoupling, recently introduced for synchronizing identical units, also supports generalized synchronization among nonidentical chaotic units. Generalized synchronization can be achieved by transient uncoupling even when it is impossible by regular coupling. We furthermore demonstrate that transient uncoupling stabilizes synchronization in the presence of common noise. Transient uncoupling works best if the units stay uncoupled whenever the driven orbit visits regions that are locally diverging in its phase space. Thus, to select a favorable uncoupling region, we propose an intuitive method that measures the local divergence at the phase points of the driven unit's trajectory by linearizing the flow and subsequently suppresses the divergence by uncoupling.

Synchronization in complex networks with a modular structure.

Science.gov (United States)

Park, Kwangho; Lai, Ying-Cheng; Gupte, Saurabh; Kim, Jong-Won

2006-03-01

Networks with a community (or modular) structure arise in social and biological sciences. In such a network individuals tend to form local communities, each having dense internal connections. The linkage among the communities is, however, much more sparse. The dynamics on modular networks, for instance synchronization, may be of great social or biological interest. (Here by synchronization we mean some synchronous behavior among the nodes in the network, not, for example, partially synchronous behavior in the network or the synchronizability of the network with some external dynamics.) By using a recent theoretical framework, the master-stability approach originally introduced by Pecora and Carroll in the context of synchronization in coupled nonlinear oscillators, we address synchronization in complex modular networks. We use a prototype model and develop scaling relations for the network synchronizability with respect to variations of some key network structural parameters. Our results indicate that random, long-range links among distant modules is the key to synchronization. As an application we suggest a viable strategy to achieve synchronous behavior in social networks.

Business cycle synchronization in Europe

DEFF Research Database (Denmark)

Bergman, Ulf Michael; Jonung, Lars

2011-01-01

In this paper we study business cycle synchronization in the three Scandinavian countries Denmark, Norway and Sweden prior to, during and after the Scandinavian Currency Union 1873–1913. We find that the degree of synchronization tended to increase during the currency union, thus supporting earlier...

Digital synchronization and communication techniques

Science.gov (United States)

Lindsey, William C.

1992-01-01

Information on digital synchronization and communication techniques is given in viewgraph form. Topics covered include phase shift keying, modems, characteristics of open loop digital synchronizers, an open loop phase and frequency estimator, and a digital receiver structure using an open loop estimator in a decision directed architecture.

Revelação do diagnóstico de HIV dos pais

OpenAIRE

Zanon, Bruna Pase; Almeida, Pâmela Batista de; Brum, Crhis Netto de; Paula, Cristiane Cardoso de; Padoin, Stela Maris de Mello; Quintana, Alberto Manuel

2016-01-01

Resumo Este artigo tem o propósito de avaliar evidências científicas, disponíveis na literatura, acerca dos fatores que interferem na decisão de revelar o diagnóstico de HIV dos pais para os filhos. Trata-se de revisão integrativa, desenvolvida nas bases de dados Medline e Lilacs, utilizando os termos [HIV or aids] and [criança or adolescente] and [revelação]. Selecionaram-se 14 artigos. Os fatores que interferem na decisão de revelar o diagnóstico foram: capacidade cognitiva e maturidade da ...

Atresia biliar extra-hepática: métodos diagnósticos

OpenAIRE

Cauduro Sydney M.

2003-01-01

OBJETIVO: enfatizar a importância do diagnóstico precoce da atresia biliar extra-hepática e sua relação direta com o restabelecimento cirúrgico do fluxo biliar antes do segundo mês de vida, discutindo os diversos métodos complementares utilizados, objetivando selecionar os de maior evidência, evitando retardo diagnóstico e, conseqüentemente, piora do prognóstico. MÉTODO: pesquisa bibliográfica referente ao período de 1985 a 2001, no Medline e MdConsult, através das palavras-chaves: colestase ...

Nonlinear observer based phase synchronization of chaotic systems

International Nuclear Information System (INIS)

Meng Juan; Wang Xingyuan

2007-01-01

This Letter analyzes the phase synchronization problem of autonomous chaotic systems. Based on the nonlinear state observer algorithm and the pole placement technique, a phase synchronization scheme is designed. The phase synchronization of a new chaotic system is achieved by using this observer controller. Numerical simulations further demonstrate the effectiveness of the proposed phase synchronization scheme

Structural damage detection robust against time synchronization errors

International Nuclear Information System (INIS)

Yan, Guirong; Dyke, Shirley J

2010-01-01

Structural damage detection based on wireless sensor networks can be affected significantly by time synchronization errors among sensors. Precise time synchronization of sensor nodes has been viewed as crucial for addressing this issue. However, precise time synchronization over a long period of time is often impractical in large wireless sensor networks due to two inherent challenges. First, time synchronization needs to be performed periodically, requiring frequent wireless communication among sensors at significant energy cost. Second, significant time synchronization errors may result from node failures which are likely to occur during long-term deployment over civil infrastructures. In this paper, a damage detection approach is proposed that is robust against time synchronization errors in wireless sensor networks. The paper first examines the ways in which time synchronization errors distort identified mode shapes, and then proposes a strategy for reducing distortion in the identified mode shapes. Modified values for these identified mode shapes are then used in conjunction with flexibility-based damage detection methods to localize damage. This alternative approach relaxes the need for frequent sensor synchronization and can tolerate significant time synchronization errors caused by node failures. The proposed approach is successfully demonstrated through numerical simulations and experimental tests in a lab

Stock Price Synchronicity and Material Sustainability Information

OpenAIRE

Grewal, Jody; Hauptmann, Clarissa; Serafeim, Georgios

2017-01-01

We examine if, and under what conditions, disclosure of sustainability information identified as investor relevant by market-driven innovations in accounting standard-setting, is associated with stock prices reflecting more firm-specific information and thereby lower synchronicity with market and industry returns. We find that firms voluntarily disclosing more sustainability information, identified as material by the Sustainability Accounting Standards Board (SASB), have lower stock price syn...

Acoustophoretic Synchronization of Mammalian Cells in Microchannels

DEFF Research Database (Denmark)

Thévoz, P.; Adams, J.D.; Shea, H.

2010-01-01

We report the first use of ultrasonic standing waves to achieve cell cycle phase synchronization in mammalian cells in a high-throughput and reagent-free manner. The acoustophoretic cell synchronization (ACS) device utilizes volume-dependent acoustic radiation force within a microchannel to selec......We report the first use of ultrasonic standing waves to achieve cell cycle phase synchronization in mammalian cells in a high-throughput and reagent-free manner. The acoustophoretic cell synchronization (ACS) device utilizes volume-dependent acoustic radiation force within a microchannel...

Communicating via robust synchronization of chaotic lasers

International Nuclear Information System (INIS)

Lopez-Gutierrez, R.M.; Posadas-Castillo, C.; Lopez-Mancilla, D.; Cruz-Hernandez, C.

2009-01-01

In this paper, the robust synchronization problem for coupled chaotic Nd:YAG lasers is addressed. We resort to complex systems theory to achieve chaos synchronization. Based on stability theory, it is shown that the state trajectories of the perturbed error synchronization are ultimately bounded, provided the unperturbed synchronization error system is exponentially stable, and some conditions on the bounds of the perturbation terms are satisfied. So that, encoding, transmission, and decoding in chaotic optical communications are presented. We analyze the transmission and recovery of encrypted information when parameter mismatches are considered. Computer simulations are provided to show the effectiveness of this robustness synchronization property, we present the encrypted transmission of image messages, and we show that, the transmitted image is faithfully recovered.

Communicating via robust synchronization of chaotic lasers

Energy Technology Data Exchange (ETDEWEB)

Lopez-Gutierrez, R.M. [Engineering Faculty, Baja California Autonomous University (UABC), Km. 103 Carret. Tij-Ens., 22860 Ensenada, B.C. (Mexico); Posadas-Castillo, C. [Engineering Faculty, Baja California Autonomous University (UABC), Km. 103 Carret. Tij-Ens., 22860 Ensenada, B.C. (Mexico); FIME, Autonomous University of Nuevo Leon (UANL), Pedro de Alba, S.N., Cd. Universitaria, San Nicolas de los Garza, NL (Mexico); Lopez-Mancilla, D. [Departamento de Ciencias Exactas y Tecnologicas, Centro Universitario de los Lagos, Universidad de Guadalajara (CULagos-UdeG), Enrique Diaz de Leon s/n, 47460 Lagos de Moreno, Jal. (Mexico); Cruz-Hernandez, C. [Electronics and Telecommunications Department, Scientific Research and Advanced Studies of Ensenada (CICESE), Km. 107 Carret. Tij-Ens., 22860 Ensenada, B.C. (Mexico)], E-mail: ccruz@cicese.mx

2009-10-15

In this paper, the robust synchronization problem for coupled chaotic Nd:YAG lasers is addressed. We resort to complex systems theory to achieve chaos synchronization. Based on stability theory, it is shown that the state trajectories of the perturbed error synchronization are ultimately bounded, provided the unperturbed synchronization error system is exponentially stable, and some conditions on the bounds of the perturbation terms are satisfied. So that, encoding, transmission, and decoding in chaotic optical communications are presented. We analyze the transmission and recovery of encrypted information when parameter mismatches are considered. Computer simulations are provided to show the effectiveness of this robustness synchronization property, we present the encrypted transmission of image messages, and we show that, the transmitted image is faithfully recovered.

Adaptive Synchronization of Robotic Sensor Networks

OpenAIRE

Yıldırım, Kasım Sinan; Gürcan, Önder

2014-01-01

The main focus of recent time synchronization research is developing power-efficient synchronization methods that meet pre-defined accuracy requirements. However, an aspect that has been often overlooked is the high dynamics of the network topology due to the mobility of the nodes. Employing existing flooding-based and peer-to-peer synchronization methods, are networked robots still be able to adapt themselves and self-adjust their logical clocks under mobile network dynamics? In this paper, ...

Cardiac and Respiratory Patterns Synchronize between Persons during Choir Singing

Science.gov (United States)

Müller, Viktor; Lindenberger, Ulman

2011-01-01

Dyadic and collective activities requiring temporally coordinated action are likely to be associated with cardiac and respiratory patterns that synchronize within and between people. However, the extent and functional significance of cardiac and respiratory between-person couplings have not been investigated thus far. Here, we report interpersonal oscillatory couplings among eleven singers and one conductor engaged in choir singing. We find that: (a) phase synchronization both in respiration and heart rate variability increase significantly during singing relative to a rest condition; (b) phase synchronization is higher when singing in unison than when singing pieces with multiple voice parts; (c) directed coupling measures are consistent with the presence of causal effects of the conductor on the singers at high modulation frequencies; (d) the different voices of the choir are reflected in network analyses of cardiac and respiratory activity based on graph theory. Our results suggest that oscillatory coupling of cardiac and respiratory patterns provide a physiological basis for interpersonal action coordination. PMID:21957466

Theta Phase Synchronization Is the Glue that Binds Human Associative Memory.

Science.gov (United States)

Clouter, Andrew; Shapiro, Kimron L; Hanslmayr, Simon

2017-10-23

Episodic memories are information-rich, often multisensory events that rely on binding different elements [1]. The elements that will constitute a memory episode are processed in specialized but distinct brain modules. The binding of these elements is most likely mediated by fast-acting long-term potentiation (LTP), which relies on the precise timing of neural activity [2]. Theta oscillations in the hippocampus orchestrate such timing as demonstrated by animal studies in vitro [3, 4] and in vivo [5, 6], suggesting a causal role of theta activity for the formation of complex memory episodes, but direct evidence from humans is missing. Here, we show that human episodic memory formation depends on phase synchrony between different sensory cortices at the theta frequency. By modulating the luminance of visual stimuli and the amplitude of auditory stimuli, we directly manipulated the degree of phase synchrony between visual and auditory cortices. Memory for sound-movie associations was significantly better when the stimuli were presented in phase compared to out of phase. This effect was specific to theta (4 Hz) and did not occur in slower (1.7 Hz) or faster (10.5 Hz) frequencies. These findings provide the first direct evidence that episodic memory formation in humans relies on a theta-specific synchronization mechanism. Copyright © 2017 Elsevier Ltd. All rights reserved.

Concordancia entre el diagnóstico clínico y el patológico por necropsias

Directory of Open Access Journals (Sweden)

VALDEZ-MARTÍNEZ EDITH

1998-01-01

Full Text Available Objetivo. Determinar la concordancia entre diagnósticos clínicos y patológicos con base en los resultados de necropsias. Material y métodos. Se revisaron 67 protocolos de necropsia y expedientes clínicos de niños y adultos del servicio de patología del Centro de Especialidades Médicas del Estado de Veracruz Doctor Rafael Lucio, durante 1995 y 1996. Se obtuvieron las frecuencias simples de las variables de estudio, y la concordancia se calculó con el estadístico kappa simple. Resultados. En general la cifra de necropsias fue de 10.5%. Correspondió a la población infantil la mayor frecuencia (17.5%. El 59% de diagnósticos clínicos en niños y el 57% en adultos presentaron algún tipo de error La concordancia del diagnóstico principal ante y postmortem fue de 26% (infantes y 41% (adultos. Conclusiones. La alta cifra de errores diagnósticos y la consecuente baja concordancia clínicopatológica apoyan el hecho de que, a pesar del avance tecnológico en los procedimientos diagnósticos, es necesario realizar necropsias con el fin de documentar de manera más definitiva el control de calidad del ejercicio de la medicina.

Diagnósticos de enfermagem em pacientes submetidos à cirurgia cardíaca Diagnósticos de enfermería en pacientes sometidos a la cirugía cardiaca Nursing diagnoses in patients outgoing cardiac surgery

Directory of Open Access Journals (Sweden)

Luciana Alves da Rocha

2006-06-01

Full Text Available Pesquisa exploratória e transversal realizada com pacientes no pós-operatório de cirurgia para revascularização do miocárdio. Objetivou-se identificar diagnósticos de enfermagem segundo a Taxonomia II da NANDA e intervenções de enfermagem segundo a Nursing Interventions Classification, associando-os aos resultados de enfermagem segundo a Nursing Outcomes Classification. Os dados foram colhidos de 22 pacientes por um formulário e exame físico. As informações possibilitaram a identificação de quinze diagnósticos de enfermagem, segundo a Taxonomia II NANDA, dentre eles destacam-se: Risco para infecção; Risco para constipação; Déficit no autocuidado para higiene íntima e Integridade de pele prejudicada. O estudo revelou ser fundamental desenvolver estudos sobre diagnósticos de enfermagem, para direcionar análises de problemas nos pacientes demandadoras de ações específicas de enfermagem, que contribuam para o desenvolvimento da Enfermagem.Investigación exploratoria y transversal con pacientes en el posoperatorio de cirurgía para la revascularización del miocardio. Se ha objetivado identificar diagnósticos de enfermería. Según la Taxonomia II de la NANDA, e intervenciones de enfermería por la Nursing Intervention Classification, asociándolos a los resultados de la enfermería de la Nursing Outocomes Classification. Los datos han sido recolectados de 22 (veintidós pacientes por el impreso y examen físico. Las informaciones han posibilitado la identificación de quince diagnóticos, según la Taxonomia II de la NANDA. Entre ellos, se han destacado: el riesgo de infección, el riesgo al resfriado/catarro, el déficit en el autocuidado a la higiene íntima y a la integridad de la piel perjudicada. El estudio ha revelado lo fundamental para desarrollar investigaciones sobre diagnósticos de enfermería, para dirigir análisis de problemas en los pacientes demandadores de acciones específicas de enfermería que

Perfect synchronization in networks of phase-frustrated oscillators

Science.gov (United States)

Kundu, Prosenjit; Hens, Chittaranjan; Barzel, Baruch; Pal, Pinaki

2017-11-01

Synchronizing phase-frustrated Kuramoto oscillators, a challenge that has found applications from neuronal networks to the power grid, is an eluding problem, as even small phase lags cause the oscillators to avoid synchronization. Here we show, constructively, how to strategically select the optimal frequency set, capturing the natural frequencies of all oscillators, for a given network and phase lags, that will ensure perfect synchronization. We find that high levels of synchronization are sustained in the vicinity of the optimal set, allowing for some level of deviation in the frequencies without significant degradation of synchronization. Demonstrating our results on first- and second-order phase-frustrated Kuramoto dynamics, we implement them on both model and real power grid networks, showing how to achieve synchronization in a phase-frustrated environment.

Synchronization Analysis of the Supermarket Refrigeration System

DEFF Research Database (Denmark)

Wisniewski, Rafal; Chen, Liang; Larsen, Lars Finn Sloth

2009-01-01

is analyzed using the bifurcation and chaos theory. It is demonstrated that the system can have a complex chaotic behavior, which is far from the synchronization. This shows that making the system chaotic is a good choice for a de-synchronization strategy. The positive maximum Lyapunov exponent is usually...... taken as an indication of the existence of chaos. It is used in the paper as a measure of performance for the tendency of the system to synchronize, that is, the higher value of the maximum Lyapunov exponent the lower risk for synchronization....

Price synchronization in retailing: some empirical evidence

Directory of Open Access Journals (Sweden)

Marcelo Resende

2014-06-01

Full Text Available The paper investigates the synchronization of price changes in the context of retail tire dealers in São Paulo-Brazil and selected items in supermarkets for cleaning supplies and food in Rio de Janeiro-Brazil. Results indicate similar and non-negligible synchronization for different brands, although magnitudes are distant from a perfect synchronization pattern. We find interesting patterns in inter-firm competition, with similar magnitudes across different tire types. Intra-chain synchronization is substantial, indicating that a common price adjustment policy tends to be sustained for each chain across different products.

Synchronization of Estrus in Cattle: A Review

Directory of Open Access Journals (Sweden)

R. Islam

2011-06-01

Full Text Available Numbers of estrus synchronization programmes are available in cattle based on the use of various hormones like progesterone, prostaglandin F2a and their various combinations with other hormones like estrogen and Gonadotrophin Releasing hormone (GnRH. Selection of appropriate estrus synchronization protocol should be made on the basis of management capabilities and expectations of the farmer. Synchronization of oestrus can be accomplished with the injection of prostaglandin F2a alone, but it needs proper detection of the ovarian status of the cows as prostaglandin F2a is active in only functional corpus luteum in between 8 to 17 days of estrous cycle. Progesterone may reduce fertility up to 14 percent, but short time progesterone exposure (less than 14 days is beneficial. Addition of GnRH in the Progesterone or Prostaglandin based synchronization programme is helpful for more synchrony in estrus as GnRH may be helpful to synchronize the oestrous cycle in delayed pubertal heifers and post partum cows (Post partum anoestrum and further a single, timed artificial insemination is possible with this method. New methods of synchronizing estrus in which the GnRH-PG protocol is preceded by progesterone treatment offer effective synchronization of estrus with high fertility. [Vet. World 2011; 4(3.000: 136-141

Synchronization of coupled nonidentical multidelay feedback systems

International Nuclear Information System (INIS)

Hoang, Thang Manh; Nakagawa, Masahiro

2007-01-01

We present the lag synchronization of coupled nonidentical multidelay feedback systems, in which the synchronization signal is the sum of nonlinearly transformed components of delayed state variable. The sufficient condition for synchronization is considered by the Krasovskii-Lyapunov theory. The specific examples will demonstrate and verify the effectiveness of the proposed model

Fitness for synchronization of network motifs

DEFF Research Database (Denmark)

Vega, Y.M.; Vázquez-Prada, M.; Pacheco, A.F.

2004-01-01

We study the synchronization of Kuramoto's oscillators in small parts of networks known as motifs. We first report on the system dynamics for the case of a scale-free network and show the existence of a non-trivial critical point. We compute the probability that network motifs synchronize, and fi...... that the fitness for synchronization correlates well with motifs interconnectedness and structural complexity. Possible implications for present debates about network evolution in biological and other systems are discussed....

Impulsive synchronization of Chen's hyperchaotic system

International Nuclear Information System (INIS)

Haeri, Mohammad; Dehghani, Mahsa

2006-01-01

In this Letter the impulsive synchronization of the Chen's hyperchaotic systems is discussed. Some new and sufficient conditions on varying impulsive distance are established in order to guarantee the synchronizabillity of the systems using the synchronization method. In particular, some simple conditions are derived in synchronizing the systems by equal impulsive distances. Two illustrative examples are provided to show the feasibility and the effectiveness of the proposed method. The boundaries of the stable regions are also estimated

A True Open-Loop Synchronization Technique

DEFF Research Database (Denmark)

Golestan, Saeed; Vidal, Ana; Yepes, Alejandro G.

2016-01-01

Synchronization techniques can be broadly classified into two major categories: Closed-loop and open-loop methods. The open-loop synchronization (OLS) techniques, contrary to the closed-loop ones, are unconditionally stable and benefit from a fast dynamic response. Their performance, however, tends...... is to develop a true OLS (and therefore, unconditionally stable) technique without any need for the calculation of sine and cosine functions. The effectiveness of the proposed synchronization technique is confirmed through the simulation and experimental results....

Flagellar Synchronization Is a Simple Alternative to Cell Cycle Synchronization for Ciliary and Flagellar Studies.

Science.gov (United States)

Dutta, Soumita; Avasthi, Prachee

2017-01-01

The unicellular green alga Chlamydomonas reinhardtii is an ideal model organism for studies of ciliary function and assembly. In assays for biological and biochemical effects of various factors on flagellar structure and function, synchronous culture is advantageous for minimizing variability. Here, we have characterized a method in which 100% synchronization is achieved with respect to flagellar length but not with respect to the cell cycle. The method requires inducing flagellar regeneration by amputation of the entire cell population and limiting regeneration time. This results in a maximally homogeneous distribution of flagellar lengths at 3 h postamputation. We found that time-limiting new protein synthesis during flagellar synchronization limits variability in the unassembled pool of limiting flagellar protein and variability in flagellar length without affecting the range of cell volumes. We also found that long- and short-flagella mutants that regenerate normally require longer and shorter synchronization times, respectively. By minimizing flagellar length variability using a simple method requiring only hours and no changes in media, flagellar synchronization facilitates the detection of small changes in flagellar length resulting from both chemical and genetic perturbations in Chlamydomonas . This method increases our ability to probe the basic biology of ciliary size regulation and related disease etiologies. IMPORTANCE Cilia and flagella are highly conserved antenna-like organelles that found in nearly all mammalian cell types. They perform sensory and motile functions contributing to numerous physiological and developmental processes. Defects in their assembly and function are implicated in a wide range of human diseases ranging from retinal degeneration to cancer. Chlamydomonas reinhardtii is an algal model system for studying mammalian cilium formation and function. Here, we report a simple synchronization method that allows detection of small

Phase synchronization for two Brownian motors with bistable coupling on a ratchet

International Nuclear Information System (INIS)

Mateos, Jose L.; Alatriste, F.R.

2010-01-01

Graphical abstract: We study phase synchronization for a walker with two Brownian motors with bistable coupling on a ratchet and show a connection between synchronization and optimal transport. - Abstract: We study phase synchronization for a walker on a ratchet potential. The walker consist of two particles coupled by a bistable potential that allow the interchange of the order of the particles while moving through a one-dimensional asymmetric periodic ratchet potential. We consider the deterministic and the stochastic dynamics of the center of mass of the walker in a tilted ratchet potential with an external periodic forcing, in the overdamped case. The ratchet potential has to be tilted in order to obtain a rotator or self-sustained nonlinear oscillator in the absence of external periodic forcing. This oscillator has an intrinsic frequency that can be entrained with the frequency of the external driving. We introduced a linear phase through a set of discrete time events and the associated average frequency, and show that this frequency can be synchronized with the frequency of the external driving. In this way, we can properly characterize the phenomenon of synchronization through Arnold tongues and show that the local maxima in the average velocity of the center of mass of the walker, both in the deterministic case and in the presence of noise, correspond to the borders of these Arnold tongues. In this way, we established a connection between optimal transport in ratchets and the phenomenon of phase synchronization.

Synchronization of delay-coupled nonlinear oscillators: an approach based on the stability analysis of synchronized equilibria.

Science.gov (United States)

Michiels, Wim; Nijmeijer, Henk

2009-09-01

We consider the synchronization problem of an arbitrary number of coupled nonlinear oscillators with delays in the interconnections. The network topology is described by a directed graph. Unlike the conventional approach of deriving directly sufficient synchronization conditions, the approach of the paper starts from an exact stability analysis in a (gain, delay) parameter space of a synchronized equilibrium and extracts insights from an analysis of its bifurcations and from the corresponding emerging behavior. Instrumental to this analysis a factorization of the characteristic equation is employed that not only facilitates the analysis and reduces computational cost but also allows to determine the precise role of the individual agents and the topology of the network in the (in)stability mechanisms. The study provides an algorithm to perform a stability and bifurcation analysis of synchronized equilibria. Furthermore, it reveals fundamental limitations to synchronization and it explains under which conditions on the topology of the network and on the characteristics of the coupling the systems are expected to synchronize. In the second part of the paper the results are applied to coupled Lorenz systems. The main results show that for sufficiently large coupling gains, delay-coupled Lorenz systems exhibit a generic behavior that does not depend on the number of systems and the topology of the network, as long as some basic assumptions are satisfied, including the strong connectivity of the graph. Here the linearized stability analysis is strengthened by a nonlinear stability analysis which confirms the predictions based on the linearized stability and bifurcation analysis. This illustrates the usefulness of the exact linearized analysis in a situation where a direct nonlinear stability analysis is not possible or where it yields conservative conditions from which it is hard to get qualitative insights in the synchronization mechanisms and their scaling properties

Frequência de diagnósticos de enfermagem em uma clínica cirúrgica

Directory of Open Access Journals (Sweden)

Andreza Cavalcanti Vasconcelos

2015-01-01

Full Text Available Objetivo: identificar la frecuencia de diagnósticos de enfermería en pacientes de una clínica quirúrgica. Métodos: estudio transversal, realizado con 99 pacientes en el postoperatorio de cirugía general. Datos recolectados a través de un cuestionario validado según los dominios de la NANDA Internacional, incluyendo examen físico y de laboratorio. Resultados: se encontraron 17 diagnósticos de enfermería, ocho tenían frecuencia superior a 50,0% (Riesgo de infección, Integridad del tejido perjudicado, Riesgo de estreñimiento, Ansiedad, Riesgo de sangrado, Dolor agudo, Recuperación quirúrgica demorada, Motilidad gastrointestinal disfuncional. Se observó en todos los pacientes de los Diagnósticos de Enfermería: Riesgo de infección, Integridad del tejido perjudicado y riesgo de estreñimiento. Conclusión: la frecuencia de los diagnósticos más frecuentes se introduce en los dominios de seguridad/protección y nutrición, lo que determina la necesidad de desviar la atención de enfermería, priorizando clínica del paciente.

Un análisis epistemológico del diagnóstico de depresión

Directory of Open Access Journals (Sweden)

Sandra Caponi

2009-06-01

Full Text Available Tomando como punto de partida las reflexiones de autores como Canguilhem, Hacking y Pignarre, se analiza la definición del diagnóstico de depresión. No se pretende negar la existencia de situaciones concretas que puedan corresponder a ese diagnóstico, sino realizar un análisis estrictamente epistemológico, y necesariamente incompleto, del modo como los diferentes aspectos de esta clasificación se validan y legitiman. En primer lugar se analiza, a partir de las teorizaciones de Hacking, de que modo se construyen las clasificaciones humanas. En segundo lugar, a partir de los conceptos de normalidad y patología de Canguilhem, se destacan algunas fragilidades epistemológicas del diagnóstico descriptivo de depresión presentes en el DSM-IV. Por fin, a partir fundamentalmente de los estudios de Pignarre, son analizadas algunas dificultades propias de las explicaciones etiológicas dadas a esa patología. Es posible concluir que la fragilidad epistemológica de esa categoría clasificatoria está directamente vinculada con la difusión de ese diagnóstico.

Synchronization in networks with heterogeneous coupling delays

Science.gov (United States)

Otto, Andreas; Radons, Günter; Bachrathy, Dániel; Orosz, Gábor

2018-01-01

Synchronization in networks of identical oscillators with heterogeneous coupling delays is studied. A decomposition of the network dynamics is obtained by block diagonalizing a newly introduced adjacency lag operator which contains the topology of the network as well as the corresponding coupling delays. This generalizes the master stability function approach, which was developed for homogenous delays. As a result the network dynamics can be analyzed by delay differential equations with distributed delay, where different delay distributions emerge for different network modes. Frequency domain methods are used for the stability analysis of synchronized equilibria and synchronized periodic orbits. As an example, the synchronization behavior in a system of delay-coupled Hodgkin-Huxley neurons is investigated. It is shown that the parameter regions where synchronized periodic spiking is unstable expand when increasing the delay heterogeneity.

Synchronization of hyperchaotic oscillators via single unidirectional chaotic-coupling

International Nuclear Information System (INIS)

Zou Yanli; Zhu Jie; Chen Guanrong; Luo Xiaoshu

2005-01-01

In this paper, synchronization of two hyperchaotic oscillators via a single variable's unidirectional coupling is studied. First, the synchronizability of the coupled hyperchaotic oscillators is proved mathematically. Then, the convergence speed of this synchronization scheme is analyzed. In order to speed up the response with a relatively large coupling strength, two kinds of chaotic coupling synchronization schemes are proposed. In terms of numerical simulations and the numerical calculation of the largest conditional Lyapunov exponent, it is shown that in a given range of coupling strengths, chaotic-coupling synchronization is quicker than the typical continuous-coupling synchronization. Furthermore, A circuit realization based on the chaotic synchronization scheme is designed and Pspice circuit simulation validates the simulated hyperchaos synchronization mechanism

Two novel synchronization criterions for a unified chaotic system

International Nuclear Information System (INIS)

Tao Chaohai; Xiong Hongxia; Hu Feng

2006-01-01

Two novel synchronization criterions are proposed in this paper. It includes drive-response synchronization and adaptive synchronization schemes. Moreover, these synchronization criterions can be applied to a large class of chaotic systems and are very useful for secure communication

Synchronization of Rikitake chaotic attractor using active control

International Nuclear Information System (INIS)

Vincent, U.E.

2005-01-01

Using synchronization technique based on control theory, we design an active controller which enables the synchronization of two identical Rikitake two-disc dynamo systems. Numerical simulations are used to show the robustness of the active control scheme in synchronizing coupled Rikitake dynamical systems. On the sequential application of the active control, transitions from temporary phase locking (TPL) state to complete synchronization state were found

Characteristics of flux variations of energetic particles associated with storm sudden commencement at synchronous orbit

International Nuclear Information System (INIS)

Tomomura, Kiyoshi; Kato, Yoshio; Sakurai, Tohru

1982-01-01

Characteristics of flux variations of energetic particles associated with Storm Sudden Commencement (SSC) are examined on the basis of the particle's data observed by solid state detecter onboard the synchronous satellite, GMS ''Himawari'', during the period from Febuary 1978 to August 1979. The energy of the particles are covered from 1.2 to 4.0 MeV for proton and greater than 2 MeV for electron, respectively. The flux variations for protons generally increase in association with SSC. However, for electrons, they show the increase except 7 events (the decrease event) among 40 events studied. It is evident that the values of the flux attained immediately after SSC (J) clearly depend on those just before SSC(J 0 ). They follow a Power law (J proportional J 0 sup( n)). The variation of the proton flux ( + ΔJ + = + J - J 0+ ) increases with the value of the flux just before SSC. In both increase and decrease events for electrons, the variation of the flux tends to increase until the flux just before SSC attains the value of 10 4 , then to decrease as its value exceeds 10 4 . (author)

Diagnóstico de hipotiroidismo canino e hipertiroidismo felino 

OpenAIRE

Melián Limiñana, Carlos

1999-01-01

[ES] Evaluamos 854 animales para determinar la utilidad de nuevas pruebas hormonales para el diagnóstico de las enfermedades tiroideas más comunes en los animales de compañía: hipotiroidismo canino e hipertiroidismo felino.

Robust Timing Synchronization in Aeronautical Mobile Communication Systems

Science.gov (United States)

Xiong, Fu-Qin; Pinchak, Stanley

2004-01-01

This work details a study of robust synchronization schemes suitable for satellite to mobile aeronautical applications. A new scheme, the Modified Sliding Window Synchronizer (MSWS), is devised and compared with existing schemes, including the traditional Early-Late Gate Synchronizer (ELGS), the Gardner Zero-Crossing Detector (GZCD), and the Sliding Window Synchronizer (SWS). Performance of the synchronization schemes is evaluated by a set of metrics that indicate performance in digital communications systems. The metrics are convergence time, mean square phase error (or root mean-square phase error), lowest SNR for locking, initial frequency offset performance, midstream frequency offset performance, and system complexity. The performance of the synchronizers is evaluated by means of Matlab simulation models. A simulation platform is devised to model the satellite to mobile aeronautical channel, consisting of a Quadrature Phase Shift Keying modulator, an additive white Gaussian noise channel, and a demodulator front end. Simulation results show that the MSWS provides the most robust performance at the cost of system complexity. The GZCD provides a good tradeoff between robustness and system complexity for communication systems that require high symbol rates or low overall system costs. The ELGS has a high system complexity despite its average performance. Overall, the SWS, originally designed for multi-carrier systems, performs very poorly in single-carrier communications systems. Table 5.1 in Section 5 provides a ranking of each of the synchronization schemes in terms of the metrics set forth in Section 4.1. Details of comparison are given in Section 5. Based on the results presented in Table 5, it is safe to say that the most robust synchronization scheme examined in this work is the high-sample-rate Modified Sliding Window Synchronizer. A close second is its low-sample-rate cousin. The tradeoff between complexity and lowest mean-square phase error determines

Síndrome de ovario poliquístico: diagnóstico en la adolescencia

OpenAIRE

Paulina M. Merino, Dra.; P. Carolina Schulin-Zeuthen, Dra.; B. Gigliola Cannoni, Dra.; R. Carolina Conejero, Dra.

2015-01-01

La sospecha de Síndrome de Ovario Poliquístico es un motivo de consulta frecuente durante la adolescencia, esto probablemente está dado por la sobreposición de las características fisiológicas de este período con los criterios diagnósticos tradicionalmente usados para definir este síndrome, tales como ciclos menstruales irregulares, hiperandrogenismo y morfología ecográfica de ovario poliquístico. Es por esto que parece importante discutir si los criterios diagnósticos de Síndrome de Ovario P...

Mixed synchronization in chaotic oscillators using scalar coupling

Energy Technology Data Exchange (ETDEWEB)

Bhowmick, Sourav K.; Hens, Chittaranjan [CSIR – Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032 (India); Ghosh, Dibakar, E-mail: drghosh_math@yahoo.co.in [Department of Mathematics, University of Kalyani, West Bengal 741235 (India); Dana, Syamal K. [CSIR – Indian Institute of Chemical Biology, Jadavpur, Kolkata 700032 (India)

2012-07-23

We report experimental evidence of mixed synchronization in two unidirectionally coupled chaotic oscillators using a scalar coupling. In this synchronization regime, some of the state variables may be in complete synchronization while others may be in anti-synchronization state. We extended the theory by using an adaptive controller with an updating law based on Lyapunov function stability to include parameter fluctuation. Using the scheme, we implemented a cryptographic encoding for digital signal through parameter modulation. -- Highlights: ► We provided experimental evidence of the mixed synchronization scheme while other methods are mostly theoretical nature. ► We numerically studied adaptive mixed synchronization when the parameters are not completely known using scalar coupling. ► We proposed a secure communication system where three digital messages are transmitted using parameter modulation.

Detection of generalized synchronization using echo state networks

Science.gov (United States)

Ibáñez-Soria, D.; Garcia-Ojalvo, J.; Soria-Frisch, A.; Ruffini, G.

2018-03-01

Generalized synchronization between coupled dynamical systems is a phenomenon of relevance in applications that range from secure communications to physiological modelling. Here, we test the capabilities of reservoir computing and, in particular, echo state networks for the detection of generalized synchronization. A nonlinear dynamical system consisting of two coupled Rössler chaotic attractors is used to generate temporal series consisting of time-locked generalized synchronized sequences interleaved with unsynchronized ones. Correctly tuned, echo state networks are able to efficiently discriminate between unsynchronized and synchronized sequences even in the presence of relatively high levels of noise. Compared to other state-of-the-art techniques of synchronization detection, the online capabilities of the proposed Echo State Network based methodology make it a promising choice for real-time applications aiming to monitor dynamical synchronization changes in continuous signals.

Synchronous sigmoid and caecal cancers together with a primary renal cell carcinoma.

LENUS (Irish Health Repository)

Bhargava, A

2012-06-01

Multiple primary neoplasms, a common clinical entity, can be classified as synchronous or metachronous. Renal cell carcinoma, in particular, is associated with a high rate of multiple primary neoplasms.

Synchronization of delay-coupled nonlinear oscillators : an approach based on the stability analysis of synchronized equilibria

NARCIS (Netherlands)

Michiels, W.; Nijmeijer, H.

2009-01-01

We consider the synchronization problem of an arbitrary number of coupled nonlinear oscillators with delays in the interconnections. The network topology is described by a directed graph. Unlike the conventional approach of deriving directly sufficient synchronization conditions, the approach of the

Synchronization and comparison of Lifelog audio recordings

DEFF Research Database (Denmark)

Nielsen, Andreas Brinch; Hansen, Lars Kai

2008-01-01

as a preprocessing step to select and synchronize recordings before further processing. The two methods perform similarly in classification, but fingerprinting scales better with the number of recordings, while cross-correlation can offer sample resolution synchronization. We propose and investigate the benefits...... of combining the two. In particular we show that the combination allows sample resolution synchronization and scalability....

A Spatiotemporal-Chaos-Based Cryptosystem Taking Advantage of Both Synchronous and Self-Synchronizing Schemes

Science.gov (United States)

Lü, Hua-Ping; Wang, Shi-Hong; Li, Xiao-Wen; Tang, Guo-Ning; Kuang, Jin-Yu; Ye, Wei-Ping; Hu, Gang

2004-06-01

Two-dimensional one-way coupled map lattices are used for cryptography where multiple space units produce chaotic outputs in parallel. One of the outputs plays the role of driving for synchronization of the decryption system while the others perform the function of information encoding. With this separation of functions the receiver can establish a self-checking and self-correction mechanism, and enjoys the advantages of both synchronous and self-synchronizing schemes. A comparison between the present system with the system of advanced encryption standard (AES) is presented in the aspect of channel noise influence. Numerical investigations show that our system is much stronger than AES against channel noise perturbations, and thus can be better used for secure communications with large channel noise.

Neumoperitoneo espontáneo no quirúrgico: Un dilema diagnóstico

Directory of Open Access Journals (Sweden)

Armando Leal Mursulí

1999-08-01

Full Text Available El neumoperitoneo espontáneo no quirúrgico es una condición infrecuente dentro de la práctica médica diaria. Generalmente, su aparición implica una intervención quirúrgica innecesaria, por lo difícil que resulta su diagnóstico, principalmente en un paciente traumatizado. Se presenta una paciente con esta afección, y se hace énfasis en la fisiopatología, así como en los diferentes medios diagnósticos aplicables en esta situación. Se señala a la laparotomía exploradora, como el último recurso en los casos de mayor dificultad diagnósticaNonsurgical spontaneous pneumoperitoneum is a rarely seen condition in daily medical practice. Generally, its appearance implies an unnecessary surgical procedure, due to its difficult diagnosis, mainly in a traumatized patient. A patient with this affection is presented and emphasis is made on the physiopathology as well as on the different diagnostic aids that may be used in this situation. Explorative laparotomy is recommended as the last resource in those cases that are very difficult to diagnose

Guide to Synchronization of Video Systems to IRIG Timing

Science.gov (United States)

1992-07-01

and industry. 1-2 CHAPTER 2 SYNCHRONISATION Before delving into the details of synchronization , a review is needed of the reasons for synchronizing ... Synchronization of Video Systems to IRIG Timing Optical Systems Group Range Commanders Council White Sands Missile Range, NM 88002-5110 RCC Document 456-92 Range...This document addresses a broad field of video synchronization to IRIG timing with emphasis on color synchronization . This document deals with

Diagnósticos em psiquiatria infantil: uma reflexão a partir da obra de Winnicott

Directory of Open Access Journals (Sweden)

Rosana Kesrouani

Full Text Available A realização dos diagnósticos em psiquiatria infantil depende tanto do campo teórico que constitui esta especialidade como da forma que é realizado. É necessário discutir estes aspectos, pois o diagnóstico tem implicações na terapêutica a ser proposta, para a realização de pesquisas e para a proposição de ações de saúde, e para a vida tanto do paciente quanto de sua família. Este artigo pretende evidenciar algumas das contribuições de D. W. Winnicott e propor discussão sobre o diagnóstico em psiquiatria infantil.

Estudo comparativo entre citopatologia e histopatologia no diagnóstico de neoplasias caninas

Directory of Open Access Journals (Sweden)

Magalhães Adelaide M.

2001-01-01

Full Text Available Foi realizado um estudo comparativo entre os diagnósticos citológico e histopatológico em diversas neoplasias de 150 cães, pelas colorações de Wright, May-Grünwald-Giemsa, Novo Azul de Metileno e Papanicolau. Colorações histológicas como Hematoxilina-Eosina, van Gieson, Sudan, Azul de Toluidina e Ácido Periódico de Schiff também foram empregadas. Os dados revelaram uma eficácia de ordem de 85,3% no diagnóstico citopatológico, considerando-se os resultados histopatológicos como corretos. Em 4,0% dos casos somente a origem embrionária das neoplasias foi estabelecida. Em 1,3% das neoplasias apenas o prognóstico foi determinado; o diagnóstico citológico diferiu da histopatologia em 8,1% dos casos. Em dois casos (1,3% o diagnóstico citológico diferiu do histológico, mas um reexame determinou que o primeiro estava correto, o que elevou a sua eficácia para 86,6%. Entre as técnicas utilizadas, a punção aspirativa por agulha fina foi o melhor método para obter amostras. A citologia não foi adequada para o diagnóstico de neoplasias mamárias, dadas às variações morfológicas em diferentes áreas. A impressão em lâmina não é recomendada para análise de tumores mesenquimais e deve ser substituída pela citologia esfoliativa. O Wright revelou-se o método de coloração mais eficiente. As colorações adaptadas da histopatologia, van Gieson em leiomiomas e leiomiossarcomas, Sudan em lipomas e lipossarcomas, e Ácido Periódico de Schiff e Azul de Toluidina em mastocitomas, foram empregadas com sucesso fornecendo assim maior clareza de detalhes para as diversas neoformações de origem epitelial e mesenquimal.

Fault Location Based on Synchronized Measurements: A Comprehensive Survey

Science.gov (United States)

Al-Mohammed, A. H.; Abido, M. A.

2014-01-01

This paper presents a comprehensive survey on transmission and distribution fault location algorithms that utilize synchronized measurements. Algorithms based on two-end synchronized measurements and fault location algorithms on three-terminal and multiterminal lines are reviewed. Series capacitors equipped with metal oxide varistors (MOVs), when set on a transmission line, create certain problems for line fault locators and, therefore, fault location on series-compensated lines is discussed. The paper reports the work carried out on adaptive fault location algorithms aiming at achieving better fault location accuracy. Work associated with fault location on power system networks, although limited, is also summarized. Additionally, the nonstandard high-frequency-related fault location techniques based on wavelet transform are discussed. Finally, the paper highlights the area for future research. PMID:24701191

Synchronous primary adenocarcinoma and adenosquamous carcinoma of the esophagus

International Nuclear Information System (INIS)

Cirillo, L.C.; Franco, R.; Gatta, G.; Rosa, G. de; Mainenti, P.P.; Imbriaco, M.; Salvatore, M.

2001-01-01

Multiple malignant esophageal tumors of the same cell type are described. In the esophageal mucosa, widespread carcinomatous transformation may be observed and multicentric invasive squamous cell carcinomas may develop. The concomitance of two independent esophageal malignant neoplasms of different epithelial histogenesis is uncommon. Synchronous adenocarcinoma and squamous cell carcinoma of the esophagus is reported. Adenosquamous carcinoma of the esophagus is a rare tumor. Adenocarcinoma of the esophagus represents 10% of esophageal cancer. We report a case of a synchronous primary invasive adenosquamous carcinoma and adenocarcinoma of the esophagus. Both tumors were demonstrated radiographically. The peculiarity of this neoplastic association and the importance of complete radiographic esophageal evaluation in patients with one obvious obstructing tumor of the esophagus are emphasized. (orig.)

Fault Location Based on Synchronized Measurements: A Comprehensive Survey

Directory of Open Access Journals (Sweden)

A. H. Al-Mohammed

2014-01-01

Full Text Available This paper presents a comprehensive survey on transmission and distribution fault location algorithms that utilize synchronized measurements. Algorithms based on two-end synchronized measurements and fault location algorithms on three-terminal and multiterminal lines are reviewed. Series capacitors equipped with metal oxide varistors (MOVs, when set on a transmission line, create certain problems for line fault locators and, therefore, fault location on series-compensated lines is discussed. The paper reports the work carried out on adaptive fault location algorithms aiming at achieving better fault location accuracy. Work associated with fault location on power system networks, although limited, is also summarized. Additionally, the nonstandard high-frequency-related fault location techniques based on wavelet transform are discussed. Finally, the paper highlights the area for future research.

Quantum synchronization in an optomechanical system based on Lyapunov control.

Science.gov (United States)

Li, Wenlin; Li, Chong; Song, Heshan

2016-06-01

We extend the concepts of quantum complete synchronization and phase synchronization, which were proposed in A. Mari et al., Phys. Rev. Lett. 111, 103605 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.103605, to more widespread quantum generalized synchronization. Generalized synchronization can be considered a necessary condition or a more flexible derivative of complete synchronization, and its criterion and synchronization measure are proposed and analyzed in this paper. As examples, we consider two typical generalized synchronizations in a designed optomechanical system. Unlike the effort to construct a special coupling synchronization system, we purposefully design extra control fields based on Lyapunov control theory. We find that the Lyapunov function can adapt to more flexible control objectives, which is more suitable for generalized synchronization control, and the control fields can be achieved simply with a time-variant voltage. Finally, the existence of quantum entanglement in different generalized synchronizations is also discussed.

A Semantics of Synchronization.

Science.gov (United States)

1980-09-01

suggestion of having very hungry philosophers. One can easily imagine the complexity of the equivalent implementation using semaphores . Synchronization types...Edinburgh, July 1978. [STAR79] Stark, E.W., " Semaphore Primitives and Fair Mutual Exclusion," TM-158, Laboratory for Computer Science, M.I.T., Cambridge...AD-AQ91 015 MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR COMPUTE--ETC F/S 9/2 A SEMANTICS OF SYNCHRONIZATION .(U) .C SEP 80 C A SEAQUIST N00015-75

Evaluación de escalas diagnósticas en pacientes con dolor abdominal sugestivo de apendicitis

Directory of Open Access Journals (Sweden)

Álvaro Sanabria

2007-09-01

Conclusión. Para hombres con dolor en la fosa iliaca derecha, el diagnóstico hecho por el cirujano es mejor que las escalas diagnósticas. Para el caso de las mujeres, la escala de Fenyö ofrece una mejor sensibilidad. La escala de Alvarado puede facilitar la conducta en pacientes con dolor en fosa iliaca derecha.

Protecting Clock Synchronization: Adversary Detection through Network Monitoring

Directory of Open Access Journals (Sweden)

Elena Lisova

2016-01-01

Full Text Available Nowadays, industrial networks are often used for safety-critical applications with real-time requirements. Such applications usually have a time-triggered nature with message scheduling as a core property. Scheduling requires nodes to share the same notion of time, that is, to be synchronized. Therefore, clock synchronization is a fundamental asset in real-time networks. However, since typical standards for clock synchronization, for example, IEEE 1588, do not provide the required level of security, it raises the question of clock synchronization protection. In this paper, we identify a way to break synchronization based on the IEEE 1588 standard, by conducting a man-in-the-middle (MIM attack followed by a delay attack. A MIM attack can be accomplished through, for example, Address Resolution Protocol (ARP poisoning. Using the AVISPA tool, we evaluate the potential to perform a delay attack using ARP poisoning and analyze its consequences showing both that the attack can, indeed, break clock synchronization and that some design choices, such as a relaxed synchronization condition mode, delay bounding, and using knowledge of environmental conditions, can make the network more robust/resilient against these kinds of attacks. Lastly, a Configuration Agent is proposed to monitor and detect anomalies introduced by an adversary performing attacks targeting clock synchronization.

Linear Synchronous Motor Repeatability Tests

International Nuclear Information System (INIS)

Ward, C.R.

2002-01-01

A cart system using linear synchronous motors was being considered for the Plutonium Immobilization Plant (PIP). One of the applications in the PIP was the movement of a stack of furnace trays, filled with the waste form (pucks) from a stacking/unstacking station to several bottom loaded furnaces. A system was ordered to perform this function in the PIP Ceramic Prototype Test Facility (CPTF). This system was installed and started up in SRTC prior to being installed in the CPTF. The PIP was suspended and then canceled after the linear synchronous motor system was started up. This system was used to determine repeatability of a linear synchronous motor cart system for the Modern Pit Facility

Chaos synchronizations of chaotic systems via active nonlinear control

International Nuclear Information System (INIS)

Huang, J; Xiao, T J

2008-01-01

This paper not only investigates the chaos synchronization between two LCC chaotic systems, but also discusses the chaos synchronization between LCC system and Genesio system. Some novel active nonlinear controllers are designed to achieve synchronizations between drive and response systems effectively. Moreover, the sufficient conditions of synchronizations are derived by using Lyapunov stability theorem. Numerical simulations are presented to verify the theoretical analysis, which shows that the synchronization schemes are global effective

Construção de instrumento para avaliar a acurácia diagnóstica Construcción de instrumento para evaluar la exactitud diagnóstica Development of an instrument to evaluate diagnosis accuracy

Directory of Open Access Journals (Sweden)

Fabiana Gonçalves de Oliveira Azevedo Matos

2009-12-01

Full Text Available Diagnósticos acurados são importantes para a escolha adequada de intervenções. Neste artigo relata-se pesquisa metodológica de desenvolvimento de instrumento para estimar a acurácia de diagnósticos de enfermagem a partir de dados escritos da avaliação de paciente. Elaborou-se a definição de acurácia e a construção dos itens que compõem o instrumento, submetendo-os a validação de conteúdo e teste piloto. O instrumento foi denominado Escala de Acurácia de Diagnóstico de Enfermagem - EADE e foi composto por 4 itens: Presença de pistas; Relevância da pista; Especificidade da pista e Coerência da pista. As respostas de 12 enfermeiros especialistas à aplicação da EADE aos diagnósticos de 5 casos escritos permitiram identificar valores para cada item e estimar a validade e confiabilidade da EADE.Diagnósticos precisos son importantes para la elección adecuada de las intervenciones. Este artículo se refiere al desarrollo de herramienta metodológica de investigación para estimar la precisión de los diagnósticos de enfermería apartir de datos escritos de la evaluación de paciente. Se elaboró la definición de la precisión y la construcción de los elementos que componen el instrumento, sometiéndolos a prueba del contenido y el test piloto. El instrumento fue llamado Exactitud Diagnóstica de Enfermería - EADE y estaba compuesto por 4 elementos: Presencia de pistas; Pertinencia de la pista; especificidad de la pista y la coherencia de la pista. Las respuestas de 12 enfermeros especialistas a la aplicación de EADE a los diagnósticos de 5 casos por escrito permitiran identificar los valores para cada tema y estimar la validez y la fiabilidad de EADE.Accurate diagnoses are important for choosing adequate interventions. This study reports on a methodological research that developed an instrument to estimate nursing diagnosis accuracy, based on written data from patients' assessment. A definition of accuracy was

Quantum synchronization of a driven self-sustained oscillator.

Science.gov (United States)

Walter, Stefan; Nunnenkamp, Andreas; Bruder, Christoph

2014-03-07

Synchronization is a universal phenomenon that is important both in fundamental studies and in technical applications. Here we investigate synchronization in the simplest quantum-mechanical scenario possible, i.e., a quantum-mechanical self-sustained oscillator coupled to an external harmonic drive. Using the power spectrum we analyze synchronization in terms of frequency entrainment and frequency locking in close analogy to the classical case. We show that there is a steplike crossover to a synchronized state as a function of the driving strength. In contrast to the classical case, there is a finite threshold value in driving. Quantum noise reduces the synchronized region and leads to a deviation from strict frequency locking.

Synchronization of modified Colpitts oscillators with structural perturbations

Energy Technology Data Exchange (ETDEWEB)

Kammogne, Soup Tewa; Fotsin, H B, E-mail: hbfotsin@yahoo.fr [Laboratoire d' electronique, Departement de Physique, Faculte des sciences, Universite de Dschang, PO Box 067, Dschang (Cameroon)

2011-06-01

This paper deals with the problem of the synchronization of uncertain modified Colpitts oscillators. Considering the effect of external disturbances on the system parameters and nonlinear control inputs, a robust controller based on Lyapunov theory is designed for the output synchronization between a slave system and a master system in order to ensure the synchronization of uncertain modified Colpitts oscillator systems. This approach was chosen not only to guarantee a stable synchronization but also to reduce the effect of external perturbation. Nonadaptive feedback synchronization with only one controller for the system is investigated. Numerical simulations are performed to confirm the efficiency of the proposed control scheme.

Stroboscope Based Synchronization of Full Frame CCD Sensors.

Science.gov (United States)

Shen, Liang; Feng, Xiaobing; Zhang, Yuan; Shi, Min; Zhu, Dengming; Wang, Zhaoqi

2017-04-07

The key obstacle to the use of consumer cameras in computer vision and computer graphics applications is the lack of synchronization hardware. We present a stroboscope based synchronization approach for the charge-coupled device (CCD) consumer cameras. The synchronization is realized by first aligning the frames from different video sequences based on the smear dots of the stroboscope, and then matching the sequences using a hidden Markov model. Compared with current synchronized capture equipment, the proposed approach greatly reduces the cost by using inexpensive CCD cameras and one stroboscope. The results show that our method could reach a high accuracy much better than the frame-level synchronization of traditional software methods.

Bursting oscillations, bifurcation and synchronization in neuronal systems

Energy Technology Data Exchange (ETDEWEB)

Wang Haixia [School of Science, Nanjing University of Science and Technology, Nanjing 210094 (China); Wang Qingyun, E-mail: drwangqy@gmail.com [Department of Dynamics and Control, Beihang University, Beijing 100191 (China); Lu Qishao [Department of Dynamics and Control, Beihang University, Beijing 100191 (China)

2011-08-15

Highlights: > We investigate bursting oscillations and related bifurcation in the modified Morris-Lecar neuron. > Two types of fast-slow bursters are analyzed in detail. > We show the properties of some crucial bifurcation points. > Synchronization transition and the neural excitability are explored in the coupled bursters. - Abstract: This paper investigates bursting oscillations and related bifurcation in the modified Morris-Lecar neuron. It is shown that for some appropriate parameters, the modified Morris-Lecar neuron can exhibit two types of fast-slow bursters, that is 'circle/fold cycle' bursting and 'subHopf/homoclinic' bursting with class 1 and class 2 neural excitability, which have different neuro-computational properties. By means of the analysis of fast-slow dynamics and phase plane, we explore bifurcation mechanisms associated with the two types of bursters. Furthermore, the properties of some crucial bifurcation points, which can determine the type of the burster, are studied by the stability and bifurcation theory. In addition, we investigate the influence of the coupling strength on synchronization transition and the neural excitability in two electrically coupled bursters with the same bursting type. More interestingly, the multi-time-scale synchronization transition phenomenon is found as the coupling strength varies.

Potential Mechanisms and Functions of Intermittent Neural Synchronization

Directory of Open Access Journals (Sweden)

Sungwoo Ahn

2017-05-01

Full Text Available Neural synchronization is believed to play an important role in different brain functions. Synchrony in cortical and subcortical circuits is frequently variable in time and not perfect. Few long intervals of desynchronized dynamics may be functionally different from many short desynchronized intervals although the average synchrony may be the same. Recent analysis of imperfect synchrony in different neural systems reported one common feature: neural oscillations may go out of synchrony frequently, but primarily for a short time interval. This study explores potential mechanisms and functional advantages of this short desynchronizations dynamics using computational neuroscience techniques. We show that short desynchronizations are exhibited in coupled neurons if their delayed rectifier potassium current has relatively large values of the voltage-dependent activation time-constant. The delayed activation of potassium current is associated with generation of quickly-rising action potential. This “spikiness” is a very general property of neurons. This may explain why very different neural systems exhibit short desynchronization dynamics. We also show how the distribution of desynchronization durations may be independent of the synchronization strength. Finally, we show that short desynchronization dynamics requires weaker synaptic input to reach a pre-set synchrony level. Thus, this dynamics allows for efficient regulation of synchrony and may promote efficient formation of synchronous neural assemblies.

Impulsive generalized function synchronization of complex dynamical networks

International Nuclear Information System (INIS)

Zhang, Qunjiao; Chen, Juan; Wan, Li

2013-01-01

This Letter investigates generalized function synchronization of continuous and discrete complex networks by impulsive control. By constructing the reasonable corresponding impulsively controlled response networks, some criteria and corollaries are derived for the generalized function synchronization between the impulsively controlled complex networks, continuous and discrete networks are both included. Furthermore, the generalized linear synchronization and nonlinear synchronization are respectively illustrated by several examples. All the numerical simulations demonstrate the correctness of the theoretical results

Stroboscope Based Synchronization of Full Frame CCD Sensors

OpenAIRE

Shen, Liang; Feng, Xiaobing; Zhang, Yuan; Shi, Min; Zhu, Dengming; Wang, Zhaoqi

2017-01-01

The key obstacle to the use of consumer cameras in computer vision and computer graphics applications is the lack of synchronization hardware. We present a stroboscope based synchronization approach for the charge-coupled device (CCD) consumer cameras. The synchronization is realized by first aligning the frames from different video sequences based on the smear dots of the stroboscope, and then matching the sequences using a hidden Markov model. Compared with current synchronized capture equi...

Methodology for GPS Synchronization Evaluation with High Accuracy

OpenAIRE

Li Zan; Braun Torsten; Dimitrova Desislava

2015-01-01

Clock synchronization in the order of nanoseconds is one of the critical factors for time based localization. Currently used time synchronization methods are developed for the more relaxed needs of network operation. Their usability for positioning should be carefully evaluated. In this paper we are particularly interested in GPS based time synchronization. To judge its usability for localization we need a method that can evaluate the achieved time synchronization with nanosecond accuracy. Ou...

Methodology for GPS Synchronization Evaluation with High Accuracy

OpenAIRE

Li, Zan; Braun, Torsten; Dimitrova, Desislava Cvetanova

2015-01-01

Clock synchronization in the order of nanoseconds is one of the critical factors for time-based localization. Currently used time synchronization methods are developed for the more relaxed needs of network operation. Their usability for positioning should be carefully evaluated. In this paper, we are particularly interested in GPS-based time synchronization. To judge its usability for localization we need a method that can evaluate the achieved time synchronization with nanosecond accuracy. O...

Diagnóstico do transtorno de estresse pós-traumático

Directory of Open Access Journals (Sweden)

Figueira Ivan

2003-01-01

Full Text Available Só recentemente a Psiquiatria Brasileira começou a reconhecer a importância do diagnóstico do transtorno de estresse pós-traumático (TEPT. Embora os brasileiros tenham uma alta prevalência de exposição a eventos traumáticos, como acidentes e homicídios, há poucos estudos teóricos e empíricos sobre o TEPT em nosso país. Este artigo tem como foco descrever brevemente o diagnóstico de TEPT, detalhando sua fenomenologia. Após discutir a definição de evento traumático, nós focalizamos nos desafios do exame psíquico desses pacientes. Em seguida enfatiza-se a descrição dos sintomas do TEPT, dando exemplos clínicos para ilustrar os mais importantes conceitos psicopatológicos. Concluímos, salientando a importância do diagnóstico de TEPT para a Psiquiatria, pois ele fornece uma estrutura referencial-conceitual para a pesquisa dos efeitos do estresse e do trauma.

On the synchronization of identical and non-identical 4-D chaotic systems using arrow form matrix

International Nuclear Information System (INIS)

Hammami, S.; Ben Saad, K.; Benrejeb, M.

2009-01-01

Using the Borne and Gentina practical criterion associated with the Benrejeb canonical arrow form matrix, to derive the stability property of dynamic complex systems, a new strategy of control is formulated for chaos synchronization of two identical Lorenz Stenflo systems and two new four-dimensional chaotic systems, namely the Qi chaotic systems. The designed controller ensures that the state variables of both controlled chaotic slave Lorenz Stenflo and Qi systems globally synchronizes with the state variables of the master systems, respectively. It is also shown that Qi system globally synchronizes with Lorenz Stenflo system under the afforded generalized strategy of control. Numerical simulations are carried out to assess the performance of the proposed contributions in the important field of chaotic synchronization.

OMEGA SYSTEM SYNCHRONIZATION.

Science.gov (United States)

TIME SIGNALS, * SYNCHRONIZATION (ELECTRONICS)), NETWORKS, FREQUENCY, STANDARDS, RADIO SIGNALS, ERRORS, VERY LOW FREQUENCY, PROPAGATION, ACCURACY, ATOMIC CLOCKS, CESIUM, RADIO STATIONS, NAVAL SHORE FACILITIES

Multivalued synchronization by Poincaré coupling

Science.gov (United States)

Ontañón-García, L. J.; Campos-Cantón, E.; Femat, R.; Campos-Cantón, I.; Bonilla-Marín, M.

2013-10-01

This work presents multivalued chaotic synchronization via coupling based on the Poincaré plane. The coupling is carried out by an underdamped signal, triggered every crossing event of the trajectory of the master system through a previously defined Poincaré plane. A master-slave system is explored, and the synchronization between the systems is detected via the auxiliary system approach and the maximum conditional Lyapunov exponent. Due to the response to specific conditions two phenomena may be obtained: univalued and multivalued synchronization. Since the Lyapunov exponent is not enough to detect these two phenomena, the distance between the pieces of trajectories of the slave and auxiliary systems with different initial conditions is also used as a tool for the detection of multivalued synchronization. Computer simulations using the benchmark chaotic systems of Lorenz and Rössler are used to exemplify the approach proposed.

On synchronized regions of discrete-time complex dynamical networks

International Nuclear Information System (INIS)

Duan Zhisheng; Chen Guanrong

2011-01-01

In this paper, the local synchronization of discrete-time complex networks is studied. First, it is shown that for any natural number n, there exists a discrete-time network which has at least left floor n/2 right floor +1 disconnected synchronized regions for local synchronization, which implies the possibility of intermittent synchronization behaviors. Different from the continuous-time networks, the existence of an unbounded synchronized region is impossible for discrete-time networks. The convexity of the synchronized regions is also characterized based on the stability of a class of matrix pencils, which is useful for enlarging the stability region so as to improve the network synchronizability.

Usability of synchronization for cognitive modeling

International Nuclear Information System (INIS)

Diebner, Hans H.; Grond, Florian

2005-01-01

We discuss the synchronization features of a previously introduced adaptive system for dynamics recognition in more detail. We investigate the usability of synchronization for modeling and parameter estimations. It is pointed out inhowfar the adaptive system based on synchronization can become a powerful tool in modeling. The adaptive system can store modules of pre-adapted dynamics and is potentially capable of undergoing self-modification. We compare the stored modules with pre-knowledge that a modeler puts into his or her models. In this sense the adaptive system functions like an expert system

Conjuntivitis folicular por Chlamydia trachomatis: frecuencia y pruebas diagnósticas

Directory of Open Access Journals (Sweden)

María E. Muñoz Z

2007-07-01

Full Text Available La Chlamydia trachomatis es la principal causa infecciosa de ceguera en el mundo, que empieza como conjuntivitis folicular. En el Perú se han realizado pocos estudios, debido a su dificultad diagnóstica. Se realizó un estudio en 55 pacientes de 18 a 68 años con diagnóstico de conjuntivitis folicular atendidos en el Instituto Nacional de Oftalmología (Lima, Perú durante los años 2005 y 2006, con el objetivo de determinar la frecuencia de infección por Chlamydia trachomatis y evaluar la utilidad de la tinción de Giemsa y la inmunofluorescencia directa (IFD para el diagnóstico de C. trachomatis en relación con el cultivo celular. La frecuencia de C. trachomatis en muestras de secreciones de conjuntivitis folicular fue de 13% (7/55 por cultivo celular, 20% (11/55 por IFD y de 9%(5/55 por Giemsa; los signos y síntomas más frecuentes fueron la presencia de secreciones y fotofobia. Todos los casos fueron varones y manifestaron no tener antecendentes de infecciones de transmisión sexual previas. Se encontró una sensibilidad de 42,9 y 85,7 % y una especificidad de 98,8 y 89,6% para la tinción Giemsa e IFD respectivamente.

Diagnóstico Parasitológico de la Leishmaniasis Tegumentaria Americana

Directory of Open Access Journals (Sweden)

César Cuba Cuba

2000-01-01

Full Text Available La demostración directa o indirecta de Leishmania en las muestras patológicas continúa siendo un importante desafío en el diagnóstico parasitológico de esta protozoosis. A pesar de los avances significativos surgidos en investigaciones de biología molecular, muchas de sus técnicas con potencial aplicación diagnóstica, continúan siendo solamente herramientas de los laboratorios de investigación científica. Pocas de ellas se encuentran en fase de valorización clínica y epidemiológica en áreas endémicas, y quizás, de manera optimista, muy pocas estarían a disposición de los laboratorios de diagnóstico de salud pública en la próxima década. Mientras tanto, seguiremos contando con el auxilio de los llamados métodos clásicos de la Parasitología básica que todavía, en las manos de individuos experimentados, diagnostican la gran mayoría de los casos. Este artículo identifica los métodos recomendados por los especialistas del tema, describe los procedimientos consagrados por su sensibilidad y reproductibilidad, concluyendo que éstos continuarán vigentes, siempre que sean correctamente ejecutados.

Ansiedad y diagnóstico del síndrome premenstrual (SPM

Directory of Open Access Journals (Sweden)

CARMEN BORRÁS SANSALONI

2001-01-01

Full Text Available La falta de una definición clara y unánime del trastorno constituye uno de los principales problemas metodológicos en la evaluación del síndro m e premenstrual (SPM, dificultando enormemente la diferenciación entre los denominados cambios premenstruales negativos (CPM- y el verdadero síndrome premenstrual (SPM. Algunos autores, con el objeto de solucionar este problema, han propuesto una serie de criterios para el correcto diagnóstico del SPM, criterios que hacen referencia a síntomas tanto emocionales como comportamentales relacionados con la fase premenstrual del ciclo ovárico y cuya severidad interfiere significativamente en la vida cotidiana de las mujeres que los padecen No obstante, por una parte, algunos autores han señalado que dichos criterios diagnósticos se refieren a una manifestación ideal del trastorno y, por otra, numerosos estudios han demostrado que el patrón general de ansiedad constituye uno de los principales factores implicados en el padecimiento del SPM. En el presente trabajo, realizado con una muestra de 133 mujeres se analiza la posible relación entre el patrón general de ansiedad así como de las respuestas emocionales manifestadas en las diferentes fases del ciclo menstrual y los criterios diagnósticos del SPM.

Diagnóstico de la epilepsia en la infancia Epilepsy diagnosis present in childhood

Directory of Open Access Journals (Sweden)

Nicolás Garófalo Gómez

2009-06-01

Full Text Available La epilepsia constituye el trastorno neurológico crónico tratable de mayor frecuencia en la infancia. Su diagnóstico es usualmente fácil, pero en la práctica clínica ocurren errores con relativa frecuencia, al no existir un marcador diagnóstico confiable. En el presente artículo se explica el proceso de diagnóstico de la epilepsia en la infancia, que no depende de un solo factor y que debe estar guiado por la historia clínica como elemento esencial.Epilepsy is the more frequent chronic neurologic disorder easy to treat in childhood. His diagnosis is commonly easy to made but in clinical practice occur relative errors provoked by lack of a reliable diagnosis. In present paper is explained the diagnostic process of epilepsy in childhood, but it not depends of a unique factor and that must to be directed by medical record as an essential element.

Diagnóstico fenotípico de las inmunodeficiencias primarias en Antioquia, Colombia, 1994-2002.

Directory of Open Access Journals (Sweden)

Carlos Julio Montoya

2002-12-01

Full Text Available La infección recurrente es una causa frecuente de consulta médica y puede deberse a un grupo heterogéneo de trastornos que incrementan la susceptibilidad a los microorganismos patógenos y oportunistas, como las deficiencias inmunológicas subyacentes. Con el fin de definir un tratamiento racional oportuno y orientar el diagnóstico molecular de las inmunodeficiencias primarias, se estableció un programa para el diagnóstico fenotípico de estas enfermedades en el departamento de Antioquia (Colombia, que comprende un análisis clínico y de laboratorio de los individuos que presentan infecciones recurrentes de evolución anormal. Entre el 1 de agosto de 1994 y el 31 de julio de 2002 se hizo el diagnóstico fenotípico de inmunodeficiencia primaria en 98 pacientes. Similar a lo informado en la literatura especializada, en esta región las deficiencias predominantes de anticuerpos fueron las más frecuentes (40,8% seguidas por las deficiencias combinadas (21,4%. Esta caracterización fenotípica ha permitido iniciar rápidamente el tratamiento adecuado y, en algunos casos, comenzar los estudios funcionales y moleculares que conduzcan al diagnóstico molecular definitivo.

Diagnósticos de enfermagem em terapia intensiva: mapeamento cruzado e Taxonomia da NANDA-I

Directory of Open Access Journals (Sweden)

Anali Martegani Ferreira

2016-04-01

Full Text Available RESUMO Objetivo: identificar diagnósticos de enfermagem em pacientes hospitalizados em UTI por meio do mapeamento cruzado de termos contidos nas anotações de enfermagem, com a Taxonomia da NANDA-I. Método: estudo exploratório descritivo, mediante análise retrospectiva dos registros de enfermagem em 256 prontuários de pacientes que estiveram hospitalizados na UTI geral de um hospital da fronteira oeste do Rio Grande do Sul. Extraíram-se, dos registros, termos que indicavam condições que demandavam intervenções de enfermagem, realizou-se mapeamento cruzado dos mesmos com os diagnósticos da Taxonomia da NANDA-I e confirmação em grupo focal de enfermeiros. Analisaram-se os dados utilizando-se estatística descritiva. Resultados: identificaram-se 832 termos e expressões que se referiam a 52 diferentes diagnósticos em nove dos 13 domínios da Taxonomia da NANDA-I. Conclusão: este estudo permitiu identificar diagnósticos de enfermagem presentes em pacientes hospitalizados na UTI, trazendo implicações para gestão do cuidado, processo de formação de especialistas na área e sistemas de informação.

Linearly and nonlinearly bidirectionally coupled synchronization of hyperchaotic systems

International Nuclear Information System (INIS)

Zhou Jin; Lu Junan; Wu Xiaoqun

2007-01-01

To date, there have been many results about unidirectionally coupled synchronization of chaotic systems. However, much less work is reported on bidirectionally-coupled synchronization. In this paper, we investigate the synchronization of two bidirectionally coupled Chen hyperchaotic systems, which are coupled linearly and nonlinearly respectively. Firstly, linearly coupled synchronization of two hyperchaotic Chen systems is investigated, and a theorem on how to choose the coupling coefficients are developed to guarantee the global asymptotical synchronization of two coupled hyperchaotic systems. Analysis shows that the choice of the coupling coefficients relies on the bound of the chaotic system. Secondly, the nonlinearly coupled synchronization is studied; a sufficient condition for the locally asymptotical synchronization is derived, which is independent of the bound of the hyperchaotic system. Finally, numerical simulations are included to verify the effectiveness and feasibility of the developed theorems

Stroboscope Based Synchronization of Full Frame CCD Sensors

Directory of Open Access Journals (Sweden)

Liang Shen

2017-04-01

Full Text Available The key obstacle to the use of consumer cameras in computer vision and computer graphics applications is the lack of synchronization hardware. We present a stroboscope based synchronization approach for the charge-coupled device (CCD consumer cameras. The synchronization is realized by first aligning the frames from different video sequences based on the smear dots of the stroboscope, and then matching the sequences using a hidden Markov model. Compared with current synchronized capture equipment, the proposed approach greatly reduces the cost by using inexpensive CCD cameras and one stroboscope. The results show that our method could reach a high accuracy much better than the frame-level synchronization of traditional software methods.

Experimental synchronization of chaos in a large ring of mutually coupled single-transistor oscillators: Phase, amplitude, and clustering effects

Energy Technology Data Exchange (ETDEWEB)

Minati, Ludovico, E-mail: lminati@ieee.org, E-mail: ludovico.minati@unitn.it [MR-Lab, Center for Mind/Brain Science, University of Trento, Italy and Scientific Department, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan (Italy)

2014-12-01

In this paper, experimental evidence of multiple synchronization phenomena in a large (n = 30) ring of chaotic oscillators is presented. Each node consists of an elementary circuit, generating spikes of irregular amplitude and comprising one bipolar junction transistor, one capacitor, two inductors, and one biasing resistor. The nodes are mutually coupled to their neighbours via additional variable resistors. As coupling resistance is decreased, phase synchronization followed by complete synchronization is observed, and onset of synchronization is associated with partial synchronization, i.e., emergence of communities (clusters). While component tolerances affect community structure, the general synchronization properties are maintained across three prototypes and in numerical simulations. The clusters are destroyed by adding long distance connections with distant notes, but are otherwise relatively stable with respect to structural connectivity changes. The study provides evidence that several fundamental synchronization phenomena can be reliably observed in a network of elementary single-transistor oscillators, demonstrating their generative potential and opening way to potential applications of this undemanding setup in experimental modelling of the relationship between network structure, synchronization, and dynamical properties.

Experimental synchronization of chaos in a large ring of mutually coupled single-transistor oscillators: Phase, amplitude, and clustering effects

International Nuclear Information System (INIS)

Minati, Ludovico

2014-01-01

In this paper, experimental evidence of multiple synchronization phenomena in a large (n = 30) ring of chaotic oscillators is presented. Each node consists of an elementary circuit, generating spikes of irregular amplitude and comprising one bipolar junction transistor, one capacitor, two inductors, and one biasing resistor. The nodes are mutually coupled to their neighbours via additional variable resistors. As coupling resistance is decreased, phase synchronization followed by complete synchronization is observed, and onset of synchronization is associated with partial synchronization, i.e., emergence of communities (clusters). While component tolerances affect community structure, the general synchronization properties are maintained across three prototypes and in numerical simulations. The clusters are destroyed by adding long distance connections with distant notes, but are otherwise relatively stable with respect to structural connectivity changes. The study provides evidence that several fundamental synchronization phenomena can be reliably observed in a network of elementary single-transistor oscillators, demonstrating their generative potential and opening way to potential applications of this undemanding setup in experimental modelling of the relationship between network structure, synchronization, and dynamical properties

30 CFR 56.19008 - Friction hoist synchronizing mechanisms.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Friction hoist synchronizing mechanisms. 56... Personnel Hoisting Hoists § 56.19008 Friction hoist synchronizing mechanisms. Where creep or slip may alter the effective position of safety devices, friction hoists shall be equipped with synchronizing...

[Synchronous sigmoideum- and caecum volvulus].

Science.gov (United States)

Berg, Anna Korsgaard; Perdawood, Sharaf Karim

2015-09-21

This case presents a synchronous sigmoid- and caecum volvulus in a 69-year old man with Parkinson's disease, hypertension and previous history of colonic volvulus. On admission the patient had abdominal pain, nausea, vomiting and constipation. The CT scan showed a sigmoid volvulus with a dilated caecum. The synchronous sigmoideum- and caecum volvulus was diagnosed intraoperatively. Total colectomy and ileostomy was performed.

Cateterismo diagnóstico en cardiopatías congénitas del adulto

OpenAIRE

García Montes,José Antonio

2006-01-01

Los métodos no invasivos en la actualidad son de elección para el diagnóstico en pacientes adultos con cardiopatía congénita. La tendencia del cateterismo cardíaco en la actualidad es el tratamiento intervencionista de algunas cardiopatías, sin embargo, en algunos casos, sobre todo en cardiopatías complejas el cateterismo diagnóstico puede ser necesario como complemento de otros métodos no invasivos. La medición de presiones, toma de oximetrías y angiografías continúa siendo fundamental en el...

Pinning Synchronization of Linear Complex Coupling Synchronous Generators Network of Hydroelectric Generating Set

Directory of Open Access Journals (Sweden)

Xuefei Wu

2014-01-01

Full Text Available A novel linear complex system for hydroturbine-generator sets in multimachine power systems is suggested in this paper and synchronization of the power-grid networks is studied. The advanced graph theory and stability theory are combined to solve the problem. Here we derive a sufficient condition under which the synchronous state of power-grid networks is stable in disturbance attenuation. Finally, numerical simulations are provided to illustrate the effectiveness of the results by the IEEE 39 bus system.

Synchronization of two chaotic systems: Dynamic compensator approach

International Nuclear Information System (INIS)

Chen, C.-K.; Lai, T.-W.; Yan, J.-J.; Liao, T.-L.

2009-01-01

This study is concerned with the identical synchronization problem for a class of chaotic systems. A dynamic compensator is proposed to achieve the synchronization between master and slave chaotic systems using only the accessible output variables. A sufficient condition is also proposed to ensure the global synchronization. Furthermore, the strictly positive real (SPR) restriction, which is normally required in most of the observer-based synchronization schemes, is released in our approach. Two numerical examples are included to illustrate the proposed scheme.

Atraso diagnóstico do retinoblastoma

OpenAIRE

Rodrigues,Karla E. S.; Latorre,Maria do Rosário D. O.; Camargo,Beatriz de

2004-01-01

OBJETIVOS: Identificar os principais sinais e sintomas do retinoblastoma e determinar o tempo médio entre o início dos sintomas e o diagnóstico. MÉTODOS: Estudo retrospectivo, com revisão dos prontuários das crianças diagnosticadas com retinoblastoma entre janeiro de 1991 e junho de 2000 no Departamento de Pediatria do Hospital do Câncer de São Paulo. Análise estatística: teste t de Student, análise e variância, teste de Tukey-HSD (honest significant differences), teste de Levene, análise de ...

Emergent explosive synchronization in adaptive complex networks

Science.gov (United States)

Avalos-Gaytán, Vanesa; Almendral, Juan A.; Leyva, I.; Battiston, F.; Nicosia, V.; Latora, V.; Boccaletti, S.

2018-04-01

Adaptation plays a fundamental role in shaping the structure of a complex network and improving its functional fitting. Even when increasing the level of synchronization in a biological system is considered as the main driving force for adaptation, there is evidence of negative effects induced by excessive synchronization. This indicates that coherence alone cannot be enough to explain all the structural features observed in many real-world networks. In this work, we propose an adaptive network model where the dynamical evolution of the node states toward synchronization is coupled with an evolution of the link weights based on an anti-Hebbian adaptive rule, which accounts for the presence of inhibitory effects in the system. We found that the emergent networks spontaneously develop the structural conditions to sustain explosive synchronization. Our results can enlighten the shaping mechanisms at the heart of the structural and dynamical organization of some relevant biological systems, namely, brain networks, for which the emergence of explosive synchronization has been observed.

21 CFR 892.1970 - Radiographic ECG/respirator synchronizer.

Science.gov (United States)

2010-04-01

... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Radiographic ECG/respirator synchronizer. 892.1970... (CONTINUED) MEDICAL DEVICES RADIOLOGY DEVICES Diagnostic Devices § 892.1970 Radiographic ECG/respirator synchronizer. (a) Identification. A radiographic ECG/respirator synchronizer is a device intended to be used to...

High-alpha band synchronization across frontal, parietal and visual cortex mediates behavioral and neuronal effects of visuospatial attention.

Science.gov (United States)

Lobier, Muriel; Palva, J Matias; Palva, Satu

2018-01-15

Visuospatial attention prioritizes processing of attended visual stimuli. It is characterized by lateralized alpha-band (8-14 Hz) amplitude suppression in visual cortex and increased neuronal activity in a network of frontal and parietal areas. It has remained unknown what mechanisms coordinate neuronal processing among frontoparietal network and visual cortices and implement the attention-related modulations of alpha-band amplitudes and behavior. We investigated whether large-scale network synchronization could be such a mechanism. We recorded human cortical activity with magnetoencephalography (MEG) during a visuospatial attention task. We then identified the frequencies and anatomical networks of inter-areal phase synchronization from source localized MEG data. We found that visuospatial attention is associated with robust and sustained long-range synchronization of cortical oscillations exclusively in the high-alpha (10-14 Hz) frequency band. This synchronization connected frontal, parietal and visual regions and was observed concurrently with amplitude suppression of low-alpha (6-9 Hz) band oscillations in visual cortex. Furthermore, stronger high-alpha phase synchronization was associated with decreased reaction times to attended stimuli and larger suppression of alpha-band amplitudes. These results thus show that high-alpha band phase synchronization is functionally significant and could coordinate the neuronal communication underlying the implementation of visuospatial attention. Copyright © 2017 Elsevier Inc. All rights reserved.

Synchronization in slowly switching networks of coupled oscillators

Science.gov (United States)

Zhou, Jie; Zou, Yong; Guan, Shuguang; Liu, Zonghua; Boccaletti, S.

2016-01-01

Networks whose structure of connections evolves in time constitute a big challenge in the study of synchronization, in particular when the time scales for the evolution of the graph topology are comparable with (or even longer than) those pertinent to the units’ dynamics. We here focus on networks with a slow-switching structure, and show that the necessary conditions for synchronization, i.e. the conditions for which synchronization is locally stable, are determined by the time average of the largest Lyapunov exponents of transverse modes of the switching topologies. Comparison between fast- and slow-switching networks allows elucidating that slow-switching processes prompt synchronization in the cases where the Master Stability Function is concave, whereas fast-switching schemes facilitate synchronization for convex curves. Moreover, the condition of slow-switching enables the introduction of a control strategy for inducing synchronization in networks with arbitrary structure and coupling strength, which is of evident relevance for broad applications in real world systems. PMID:27779253

Synchronized flow in oversaturated city traffic.

Science.gov (United States)

Kerner, Boris S; Klenov, Sergey L; Hermanns, Gerhard; Hemmerle, Peter; Rehborn, Hubert; Schreckenberg, Michael

2013-11-01

Based on numerical simulations with a stochastic three-phase traffic flow model, we reveal that moving queues (moving jams) in oversaturated city traffic dissolve at some distance upstream of the traffic signal while transforming into synchronized flow. It is found that, as in highway traffic [Kerner, Phys. Rev. E 85, 036110 (2012)], such a jam-absorption effect in city traffic is explained by a strong driver's speed adaptation: Time headways (space gaps) between vehicles increase upstream of a moving queue (moving jam), resulting in moving queue dissolution. It turns out that at given traffic signal parameters, the stronger the speed adaptation effect, the shorter the mean distance between the signal location and the road location at which moving queues dissolve fully and oversaturated traffic consists of synchronized flow only. A comparison of the synchronized flow in city traffic found in this Brief Report with synchronized flow in highway traffic is made.

Impaired coupling of local and global functional feedbacks underlies abnormal synchronization and negative symptoms of schizophrenia.

Science.gov (United States)

Noh, Kyungchul; Shin, Kyung Soon; Shin, Dongkwan; Hwang, Jae Yeon; Kim, June Sic; Jang, Joon Hwan; Chung, Chun Kee; Kwon, Jun Soo; Cho, Kwang-Hyun

2013-04-10

Abnormal synchronization of brain oscillations is found to be associated with various core symptoms of schizophrenia. However, the underlying mechanism of this association remains yet to be elucidated. In this study, we found that coupled local and global feedback (CLGF) circuits in the cortical functional network are related to the abnormal synchronization and also correlated to the negative symptom of schizophrenia. Analysis of the magnetoencephalography data obtained from patients with chronic schizophrenia during rest revealed an increase in beta band synchronization and a reduction in gamma band power compared to healthy controls. Using a feedback identification method based on non-causal impulse responses, we constructed functional feedback networks and found that CLGF circuits were significantly reduced in schizophrenia. From computational analysis on the basis of the Wilson-Cowan model, we unraveled that the CLGF circuits are critically involved in the abnormal synchronization and the dynamical switching between beta and gamma bands power in schizophrenia. Moreover, we found that the abundance of CLGF circuits was negatively correlated with the development of negative symptoms of schizophrenia, suggesting that the negative symptom is closely related to the impairment of this circuit. Our study implicates that patients with schizophrenia might have the impaired coupling of inter- and intra-regional functional feedbacks and that the CLGF circuit might serve as a critical bridge between abnormal synchronization and the negative symptoms of schizophrenia.

Main injector synchronous timing system

International Nuclear Information System (INIS)

Blokland, W.; Steimel, J.

1998-01-01

The Synchronous Timing System is designed to provide sub-nanosecond timing to instrumentation during the acceleration of particles in the Main Injector. Increased energy of the beam particles leads to a small but significant increase in speed, reducing the time it takes to complete a full turn of the ring by 61 nanoseconds (or more than 3 rf buckets). In contrast, the reference signal, used to trigger instrumentation and transmitted over a cable, has a constant group delay. This difference leads to a phase slip during the ramp and prevents instrumentation such as dampers from properly operating without additional measures. The Synchronous Timing System corrects for this phase slip as well as signal propagation time changes due to temperature variations. A module at the LLRF system uses a 1.2 Gbit/s G-Link chip to transmit the rf clock and digital data (e.g. the current frequency) over a single mode fiber around the ring. Fiber optic couplers at service buildings split off part of this signal for a local module which reconstructs a synchronous beam reference signal. This paper describes the background, design and expected performance of the Synchronous Timing System. copyright 1998 American Institute of Physics

Main injector synchronous timing system

International Nuclear Information System (INIS)

Blokland, Willem; Steimel, James

1998-01-01

The Synchronous Timing System is designed to provide sub-nanosecond timing to instrumentation during the acceleration of particles in the Main Injector. Increased energy of the beam particles leads to a small but significant increase in speed, reducing the time it takes to complete a full turn of the ring by 61 nanoseconds (or more than 3 rf buckets). In contrast, the reference signal, used to trigger instrumentation and transmitted over a cable, has a constant group delay. This difference leads to a phase slip during the ramp and prevents instrumentation such as dampers from properly operating without additional measures. The Synchronous Timing System corrects for this phase slip as well as signal propagation time changes due to temperature variations. A module at the LLRF system uses a 1.2 Gbit/s G-Link chip to transmit the rf clock and digital data (e.g. the current frequency) over a single mode fiber around the ring. Fiber optic couplers at service buildings split off part of this signal for a local module which reconstructs a synchronous beam reference signal. This paper describes the background, design and expected performance of the Synchronous Timing System

Fermi Timing and Synchronization System

International Nuclear Information System (INIS)

Wilcox, R.; Staples, J.; Doolittle, L.; Byrd, J.; Ratti, A.; Kaertner, F.X.; Kim, J.; Chen, J.; Ilday, F.O.; Ludwig, F.; Winter, A.; Ferianis, M.; Danailov, M.; D'Auria, G.

2006-01-01

The Fermi FEL will depend critically on precise timing of its RF, laser and diagnostic subsystems. The timing subsystem to coordinate these functions will need to reliably maintain sub-100fs synchronicity between distant points up to 300m apart in the Fermi facility. The technology to do this is not commercially available, and has not been experimentally demonstrated in a working facility. Therefore, new technology must be developed to meet these needs. Two approaches have been researched by different groups working with the Fermi staff. At MIT, a pulse transmission scheme has been developed for synchronization of RF and laser devices. And at LBL, a CW transmission scheme has been developed for RF and laser synchronization. These respective schemes have advantages and disadvantages that will become better understood in coming years. This document presents the work done by both teams, and suggests a possible system design which integrates them both. The integrated system design provides an example of how choices can be made between the different approaches without significantly changing the basic infrastructure of the system. Overall system issues common to any synchronization scheme are also discussed

Fermi Timing and Synchronization System

Energy Technology Data Exchange (ETDEWEB)

Wilcox, R.; Staples, J.; Doolittle, L.; Byrd, J.; Ratti, A.; Kaertner, F.X.; Kim, J.; Chen, J.; Ilday, F.O.; Ludwig, F.; Winter, A.; Ferianis, M.; Danailov, M.; D' Auria, G.

2006-07-19

The Fermi FEL will depend critically on precise timing of its RF, laser and diagnostic subsystems. The timing subsystem to coordinate these functions will need to reliably maintain sub-100fs synchronicity between distant points up to 300m apart in the Fermi facility. The technology to do this is not commercially available, and has not been experimentally demonstrated in a working facility. Therefore, new technology must be developed to meet these needs. Two approaches have been researched by different groups working with the Fermi staff. At MIT, a pulse transmission scheme has been developed for synchronization of RF and laser devices. And at LBL, a CW transmission scheme has been developed for RF and laser synchronization. These respective schemes have advantages and disadvantages that will become better understood in coming years. This document presents the work done by both teams, and suggests a possible system design which integrates them both. The integrated system design provides an example of how choices can be made between the different approaches without significantly changing the basic infrastructure of the system. Overall system issues common to any synchronization scheme are also discussed.

Synchronization in complex networks with adaptive coupling

International Nuclear Information System (INIS)

Zhang Rong; Hu Manfeng; Xu Zhenyuan

2007-01-01

Generally it is very difficult to realized synchronization for some complex networks. In order to synchronize, the coupling coefficient of networks has to be very large, especially when the number of coupled nodes is larger. In this Letter, we consider the problem of synchronization in complex networks with adaptive coupling. A new concept about asymptotic stability is presented, then we proved by using the well-known LaSalle invariance principle, that the state of such a complex network can synchronize an arbitrary assigned state of an isolated node of the network as long as the feedback gain is positive. Unified system is simulated as the nodes of adaptive coupling complex networks with different topologies

Abordagem laboratorial no diagnóstico da alergia alimentar Laboratorial approach in the diagnosis of food allergy

Directory of Open Access Journals (Sweden)

Renata Rodrigues Cocco

2007-09-01

Full Text Available OBJETIVO: Revisar os exames laboratoriais disponíveis utilizados no diagnóstico da alergia alimentar mediada ou não por IgE. FONTES DE DADOS: Artigos publicados em base de dados PubMed e Embase (língua inglesa e portuguesa nos últimos dez anos. As palavras-chave utilizadas como fonte de busca foram "alergia alimentar", "diagnóstico" e "laboratório", isolados e/ou associados. SÍNTESE DOS DADOS: A abordagem diagnóstica das reações alérgicas a alimentos inclui história clínica completa, estudos laboratoriais, dietas de eliminação e desencadeamentos cegos com alimentos. Recentemente, a medida quantitativa de anticorpos IgE específicos a alimentos tem mostrado ser mais preditiva de alergia alimentar sintomática mediada por IgE. Níveis séricos de IgE específica a alimento que excedam os valores diagnósticos indicam que o paciente tem chance maior que 95% de apresentar uma reação alérgica se ingerir o alimento em questão. Estes "valores de decisão" foram definidos para alguns alimentos e resultados inconsistentes são obtidos ao se estudar diferentes populações. Os desencadeamentos com alimento, especialmente o duplo-cego controlado por placebo (DADCCP, representa a maneira mais confiável de estabelecer ou descartar o diagnóstico de hipersensibilidade alimentar. CONCLUSÕES: Número crescente de aquisições tem melhorado o valor preditivo de alguns testes laboratoriais empregados no diagnóstico de alergias alimentares. Entretanto, até hoje, não há teste in vitro ou in vivo que mostre correlação completa com a clínica da alergia alimentar. O DADCCP continua sendo o padrão-ouro no diagnóstico definitivo de alergia alimentar específica. São necessárias, urgentemente, novas abordagens diagnósticas válidadas em pacientes com alergia alimentar confirmada por DADCCP positivo.OBJCTIVE: Review the available laboratory tests used to assist in the diagnosis of IgE-mediated and non-IgE-mediated food allergy. DATA

Synchronization in Complex Networks of Nonlinear Dynamical Systems

CERN Document Server

Wu, Chai Wah

2007-01-01

This book brings together two emerging research areas: synchronization in coupled nonlinear systems and complex networks, and study conditions under which a complex network of dynamical systems synchronizes. While there are many texts that study synchronization in chaotic systems or properties of complex networks, there are few texts that consider the intersection of these two very active and interdisciplinary research areas. The main theme of this book is that synchronization conditions can be related to graph theoretical properties of the underlying coupling topology. The book introduces ide

Evaluación de la prueba de inmunofluorescencia indirecta para el diagnóstico de leptospirosis humana.

Directory of Open Access Journals (Sweden)

Piedad Agudelo Flórez

2006-06-01

Full Text Available Introducción. El diagnóstico de la leptospirosis es difícil debido al amplio espectro de síntomas clínicos que presenta. Varias pruebas diagnósticas serológicas se han desarrollado, pero su aplicación y utilidad en Colombia no han sido determinadas. Objetivos. Evaluar la prueba de inmunofluorescencia indirecta para el diagnóstico de leptospirosis humana y determinar así los anticuerpos de las clases inmunoglobulina G y M producidos contra Leptospira. Materiales y métodos. Se establecieron tres grupos de estudio. El primero incluyó 19 muestras positivas para leptospirosis de pacientes con diagnóstico clínico y prueba de microaglutinación positiva; el segundo, 40 muestras de personas sin antecedentes de leptospirosis y con microaglutinación negativa, y el tercero con 96 muestras de pacientes con otras enfermedades diferentes a leptospirosis. Todas las muestras fueron procesadas por inmunofluorescencia indirecta. Resultados. Se determinó que la inmunofluorescencia indirecta tiene sensibilidad de 89,47%, especificidad de 100%, valor predictivo negativo de 95,2% (IC95%82,6 a 99,2 y valor predictivo positivo de 100%. En forma paralela, un estudio exploratorio en 27 muestras de suero que habían sido remitidas para diagnóstico de diferentes síndromes febriles encontró que 11% de ellas fueron positivas por inmunofluorescencia indirecta para anticuerpos IgM contra Leptospira. Conclusiones. La inmunofluorescencia indirecta es una alternativa que complementa el diagnóstico de leptospirosis y los estudios seroepidemiológicos. La presencia de anticuerpos dirigidos contra Leptospira en las muestras de síndrome febril del estudio indica que la leptospirosis es una de las causas de este síndrome que el clínico debe explorar.

Explosive synchronization transitions in complex neural networks

Science.gov (United States)

Chen, Hanshuang; He, Gang; Huang, Feng; Shen, Chuansheng; Hou, Zhonghuai

2013-09-01

It has been recently reported that explosive synchronization transitions can take place in networks of phase oscillators [Gómez-Gardeñes et al. Phys. Rev. Lett. 106, 128701 (2011)] and chaotic oscillators [Leyva et al. Phys. Rev. Lett. 108, 168702 (2012)]. Here, we investigate the effect of a microscopic correlation between the dynamics and the interacting topology of coupled FitzHugh-Nagumo oscillators on phase synchronization transition in Barabási-Albert (BA) scale-free networks and Erdös-Rényi (ER) random networks. We show that, if natural frequencies of the oscillations are positively correlated with node degrees and the width of the frequency distribution is larger than a threshold value, a strong hysteresis loop arises in the synchronization diagram of BA networks, indicating the evidence of an explosive transition towards synchronization of relaxation oscillators system. In contrast to the results in BA networks, in more homogeneous ER networks, the synchronization transition is always of continuous type regardless of the width of the frequency distribution. Moreover, we consider the effect of degree-mixing patterns on the nature of the synchronization transition, and find that the degree assortativity is unfavorable for the occurrence of such an explosive transition.

Synchronization Of Parallel Discrete Event Simulations

Science.gov (United States)

Steinman, Jeffrey S.

1992-01-01

Adaptive, parallel, discrete-event-simulation-synchronization algorithm, Breathing Time Buckets, developed in Synchronous Parallel Environment for Emulation and Discrete Event Simulation (SPEEDES) operating system. Algorithm allows parallel simulations to process events optimistically in fluctuating time cycles that naturally adapt while simulation in progress. Combines best of optimistic and conservative synchronization strategies while avoiding major disadvantages. Algorithm processes events optimistically in time cycles adapting while simulation in progress. Well suited for modeling communication networks, for large-scale war games, for simulated flights of aircraft, for simulations of computer equipment, for mathematical modeling, for interactive engineering simulations, and for depictions of flows of information.

Permutation parity machines for neural synchronization

International Nuclear Information System (INIS)

Reyes, O M; Kopitzke, I; Zimmermann, K-H

2009-01-01

Synchronization of neural networks has been studied in recent years as an alternative to cryptographic applications such as the realization of symmetric key exchange protocols. This paper presents a first view of the so-called permutation parity machine, an artificial neural network proposed as a binary variant of the tree parity machine. The dynamics of the synchronization process by mutual learning between permutation parity machines is analytically studied and the results are compared with those of tree parity machines. It will turn out that for neural synchronization, permutation parity machines form a viable alternative to tree parity machines

Analysis of Distributed Consensus Time Synchronization with Gaussian Delay over Wireless Sensor Networks

Directory of Open Access Journals (Sweden)

Xiong Gang

2009-01-01

Full Text Available This paper presents theoretical results on the convergence of the distributed consensus timing synchronization (DCTS algorithm for wireless sensor networks assuming general Gaussian delay between nodes. The asymptotic expectation and mean square of the global synchronization error are computed. The results lead to the definition of a time delay balanced network in which average timing consensus between nodes can be achieved despite random delays. Several structured network architectures are studied as examples, and their associated simulation results are used to validate analytical findings.

An approach of parameter estimation for non-synchronous systems

International Nuclear Information System (INIS)

Xu Daolin; Lu Fangfang

2005-01-01

Synchronization-based parameter estimation is simple and effective but only available to synchronous systems. To come over this limitation, we propose a technique that the parameters of an unknown physical process (possibly a non-synchronous system) can be identified from a time series via a minimization procedure based on a synchronization control. The feasibility of this approach is illustrated in several chaotic systems

Development of a synchronous subset of AADL

DEFF Research Database (Denmark)

Filali, Mamoun; Lawall, Julia

2010-01-01

We study the definition and the mapping of an AADL subset: the so called synchronous subset. We show that the data port protocol used for delayed and immediate connections between periodic threads can be interpreted in a  synchronous way. In this paper, we formalize this interpretation and study ...... the development of its mapping such that the original synchronous semantics is preserved. For that purpose, we use refinements through the Event B method....

Method for Converter Synchronization with RF Injection

OpenAIRE

Joshua P. Bruckmeyer; Ivica Kostanic

2015-01-01

This paper presents an injection method for synchronizing analog to digital converters (ADC). This approach can eliminate the need for precision routed discrete synchronization signals of current technologies, such as JESD204. By eliminating the setup and hold time requirements at the conversion (or near conversion) clock rate, higher sample rate systems can be synchronized. Measured data from an existing multiple ADC conversion system was used to evaluate the method. Coherent beams were simu...

Complete switched modified function projective synchronization of a ...

Indian Academy of Sciences (India)

This paper extends previous work, where CSMFPS of chaotic systems means that all the state variables of the drive system synchronize with different state variables of the response system. As the synchronization scheme has many combined forms, it is a promising type of synchronization and can provide greater security in ...

Synchronous-flux-generator (SFG)

Energy Technology Data Exchange (ETDEWEB)

Zweygbergk, S.V.; Ljungstroem, O. (ed.)

1976-01-01

The synchronous machine is the most common rotating electric machine for producing electric energy in a large scale, but it is also used for other purposes. One well known everyday example is its use as driving motor in the electric synchronous clock. One has in this connection made full use of one of the main qualities of this kind of machine--its rotating speed is bound to the frequency of the feeding voltage, either if it is working as a motor or as a generator. Characteristics are discussed.

Pulse Synchronization System (PSS)

International Nuclear Information System (INIS)

1977-06-01

This document is intended to serve as an operations manual, as well as a documentation of the backup analyses pertinent to the design as delivered. A history of earlier unsuccessful versions of the Pulse Synchronization System (PSS) is not included. The function of the PSS is to synchronize the time of arrival at the fusion target of laser pulses that are propagated through the 20 amplifier chains of the SHIVA laser. The positional accuracy requirement is +-1.5 mm (+-5 psec), and is obtained by the PSS with a wide margin factor

NMDA-dependent phase synchronization between septal and temporal CA3 hippocampal networks.

Science.gov (United States)

Gu, Ning; Jackson, Jesse; Goutagny, Romain; Lowe, Germaine; Manseau, Frédéric; Williams, Sylvain

2013-05-08

Increasing evidence suggests that synchronization between brain regions is essential for information exchange and memory processes. However, it remains incompletely known which synaptic mechanisms contribute to the process of synchronization. Here, we investigated whether NMDA receptor-mediated synaptic plasticity was an important player in synchronization between septal and temporal CA3 areas of the rat hippocampus. We found that both the septal and temporal CA3 regions intrinsically generate weakly synchronized δ frequency oscillations in the complete hippocampus in vitro. Septal and temporal oscillators differed in frequency, power, and rhythmicity, but both required GABAA and AMPA receptors. NMDA receptor activation, and most particularly the NR2B subunit, contributed considerably more to rhythm generation at the temporal than the septal region. Brief activation of NMDA receptors by application of extracellular calcium dramatically potentiated the septal-temporal coherence for long durations (>40 min), an effect blocked by the NMDA antagonist AP-5. This long-lasting NMDA-receptor-dependent increase in coherence was also associated with an elevated phase locking of spikes locally and across regions. Changes in coherence between oscillators were associated with increases in phase locking between oscillators independent of oscillator amplitude. Finally, although the septal CA3 rhythm preceded the oscillations in temporal regions in control conditions, this was reversed during the NMDA-dependent enhancement in coherence, suggesting that NMDA receptor activation can change the direction of information flow along the septotemporal CA3 axis. These data demonstrate that plastic changes in communication between septal and temporal hippocampal regions can arise from the NMDA-dependent phase locking of neural oscillators.

La resonancia magnética en el diagnóstico de la sialoadenosis parotidea

OpenAIRE

Paz, J.; Velasco-Ortega, Eugenio

1997-01-01

La resonancia magnética (RM) constituye una técnica exploratoria importante en el diagnóstico de la patología de cabeza y cuello. Recientemente, se ha incorporado al estudio de las glándula salivales, espcialmente la parótida. En el presente trabajo se presentan los hallazgos por RM en siete casos de sialoadenosis parotidea. Las imágenes por RM demuestran el agrandamiento glandular uni o bilateral, el incremento en el tamaño de las lesiones y el diagnóstico de los cambios en la estructura int...

Identical synchronization of coupled Rossler systems

DEFF Research Database (Denmark)

Yanchuk, S.; Maistrenko, Y.; Mosekilde, Erik

1999-01-01

Analyzing the transverse stability of low periodic orbits embedded in the synchronized chaotic state for a system of two coupled Rössler oscillators, we obtain the conditions for synchronization and determine the coupling parameters for which riddled basins of attraction may arise. It is shown how...

Synchronization of oscillators in complex networks

Indian Academy of Sciences (India)

Abstract. Theory of identical or complete synchronization of identical oscillators in arbitrary networks is introduced. In addition, several graph theory concepts and results that augment the synchronization theory and a tie in closely to random, semirandom, and regular networks are introduced. Combined theories are used to ...

Synchronization of oscillators in complex networks

Indian Academy of Sciences (India)

Theory of identical or complete synchronization of identical oscillators in arbitrary networks is introduced. In addition, several graph theory concepts and results that augment the synchronization theory and a tie in closely to random, semirandom, and regular networks are introduced. Combined theories are used to explore ...

Leishmaniasis. Un caso de difícil diagnóstico

Directory of Open Access Journals (Sweden)

Fabio Londoño González

1958-11-01

Full Text Available La leishmaniasis americana es una entidad que se presenta con suma frecuencia en nuestro medio hospitalario. El diagnóstico clínico, en las formas típicas, es relativamente sencillo y el tratamiento antimonial sirve como corroboración de aquel.

Moving Stimuli Facilitate Synchronization But Not Temporal Perception.

Science.gov (United States)

Silva, Susana; Castro, São Luís

2016-01-01

Recent studies have shown that a moving visual stimulus (e.g., a bouncing ball) facilitates synchronization compared to a static stimulus (e.g., a flashing light), and that it can even be as effective as an auditory beep. We asked a group of participants to perform different tasks with four stimulus types: beeps, siren-like sounds, visual flashes (static) and bouncing balls. First, participants performed synchronization with isochronous sequences (stimulus-guided synchronization), followed by a continuation phase in which the stimulus was internally generated (imagery-guided synchronization). Then they performed a perception task, in which they judged whether the final part of a temporal sequence was compatible with the previous beat structure (stimulus-guided perception). Similar to synchronization, an imagery-guided variant was added, in which sequences contained a gap in between (imagery-guided perception). Balls outperformed flashes and matched beeps (powerful ball effect) in stimulus-guided synchronization but not in perception (stimulus- or imagery-guided). In imagery-guided synchronization, performance accuracy decreased for beeps and balls, but not for flashes and sirens. Our findings suggest that the advantages of moving visual stimuli over static ones are grounded in action rather than perception, and they support the hypothesis that the sensorimotor coupling mechanisms for auditory (beeps) and moving visual stimuli (bouncing balls) overlap.

Adaptive synchronization of Rossler system with uncertain parameters

International Nuclear Information System (INIS)

Park, Ju H.

2005-01-01

This article addresses control for the chaos synchronization of Rossler systems with three uncertain parameters. Based on the Lyapunov stability theory, an adaptive control law is derived to make the states of two identical Rossler systems asymptotically synchronized. A numerical simulations is presented to show the effectiveness of the proposed chaos synchronization scheme

Auditoria clínica para el diagnóstico de la enfermedad celiaca

Directory of Open Access Journals (Sweden)

Marco Antonio Zúñiga Montero

2014-04-01

Full Text Available La enfermedad celíaca es una inflamación crónica de la mucosa del intestino delgado por intolerancia al gluten. Hasta hace poco se había considerado como una enfermedad infrecuente, pero con el aumento de la sospecha clínica y el advenimiento de nuevas pruebas serológicos, han permitido una mayor facilidad en el diagnóstico y aumento de los casos detectados, por lo que hoy se sabe que es una condición de alta frecuencia. Sin embargo, en Costa Rica no existe un protocolo para que los médicos realicen su diagnóstico, por lo que el objetivo de esta investigación, es conocer la opinión de médicos que laboran en hospitales pertenecientes a la Caja Costarricense de Seguro Social sobre la definición de la EC, sus manifestaciones y exámenes diagnósticos necesarios para descartar o confirmar la presencia de esta enfermedad y posteriormente, dar a conocer las recomendaciones dadas según las Guías de Práctica Clínica y la mejor evidencia científica sobre la realización del diagnóstico de la enfermedad celiaca. Se determinó que las Guías de Práctica Clínica y la evidencia científica coinciden en que el diagnóstico de esta enfermedad requiere del uso combinado de la clínica (lo que requiere amplio conocimiento de los distintos patrones de presentación de la enfermedad, marcadores séricos, además de una biopsia de intestino delgado. La realización de investigaciones como ésta, ayuda a superar las dificultades que interfieren en la adecuación de la práctica clínica a la evidencia científica y poner en marcha estrategias de mejora, que contribuyan al fortalecimiento y selección del mejor criterio clínico, lo que tendrá un impacto directo y positivo sobre la atención de los pacientes.

Quantification of contraction synchronicity and contraction work in coronary artery disease

Energy Technology Data Exchange (ETDEWEB)

Niimi, Takanaga; Nanasato, Mamoru [Nagoya Daini Red Cross Hospital, Nagoya (Japan); Maeda, Hisatoshi [Dept. of Radiological Technology, Nagoya University School of Health Sciences, Nagoya(Japan)

2017-09-15

This study quantified the contraction synchronicity (CS; with 100% representing full synchrony and −100% dyssynchrony) and contraction work (CW, millijoules per centimeter squared; representing myocardial area) in patients with reduced left ventricular ejection fraction (LVEF) associated with coronary artery disease (CAD)

Incidence and epidemiological features of synchronous and metachronous colorectal cancer

Directory of Open Access Journals (Sweden)

Eduardo Brambilla

2013-04-01

Full Text Available Introduction: patients with sporadic colorectal cancer or cases associated with syndromes are at risk of having synchronous or metachronous cancer. Although it is an important subject, Brazilian data on the subject are scarce. Objective: to evaluate the incidence and epidemiological features in patients with synchro- nous and metachronous colorectal cancer in a reference service of proctology in the Rio Grande do Sul. Methods: cross-sectional observational study, performed between January and July 2012, analyzing all patients admitted in the service that met the inclusion criteria. A retrospective review of records was performed, noting demographic variables, comorbidi- ties and tumor-related variables. Results: 150 records were analyzed, of which 53.3% were males and mean age was 63 (± 13.01 years old. The most frequently found tumor location was the sigmoid colon and high rectum (50.67%, followed by the lower rectum (36%. Adenocarcinomas were the most prevalent histological subtype (88%, followed by epidermoid tumors (1.33%. Hereditary syndromes were identified in five patients (3.33%, with four being Familial adenomatous polyposis (FAP and one hereditary nonpolyposis colorectal cancer (HNPCC. Among the an- alyzed patients, four (2.67% had synchronous and one (0.67% had metachronous cancer. Conclusion: the incidence of synchronous and metachronous colorectal cancer was, respectively, 2.67% and 0.67%, results that corroborate those reported in international literature. Resumo: Introdução: pacientes com diagnóstico de câncer colorretal esporádico ou associado a sín- dromes correm risco de apresentar lesões sincrônicas ou metacrônicas. Embora seja rele- vante, há escassez de informações sobre o tema na literatura nacional. Objetivo: avaliar a incidência e o perfil epidemiológico dos pacientes com tumor colorretal sincrônico e metacrônico em um serviço de referência em proctologia do Rio Grande do Sul. Método: estudo

Does synchronization reflect a true interaction in the cardiorespiratory system?

Science.gov (United States)

Toledo, E; Akselrod, S; Pinhas, I; Aravot, D

2002-01-01

Cardiorespiratory synchronization, studied within the framework of phase synchronization, has recently raised interest as one of the interactions in the cardiorespiratory system. In this work, we present a quantitative approach to the analysis of this nonlinear phenomenon. Our primary aim is to determine whether synchronization between HR and respiration rate is a real phenomenon or a random one. First, we developed an algorithm, which detects epochs of synchronization automatically and objectively. The algorithm was applied to recordings of respiration and HR obtained from 13 normal subjects and 13 heart transplant patients. Surrogate data sets were constructed from the original recordings, specifically lacking the coupling between HR and respiration. The statistical properties of synchronization in the two data sets and in their surrogates were compared. Synchronization was observed in all groups: in normal subjects, in the heart transplant patients and in the surrogates. Interestingly, synchronization was less abundant in normal subjects than in the transplant patients, indicating that the unique physiological condition of the latter promote cardiorespiratory synchronization. The duration of synchronization epochs was significantly shorter in the surrogate data of both data sets, suggesting that at least some of the synchronization epochs are real. In view of those results, cardiorespiratory synchronization, although not a major feature of cardiorespiratory interaction, seems to be a real phenomenon rather than an artifact.

Anti-synchronization between different chaotic complex systems

International Nuclear Information System (INIS)

Liu Ping; Liu Shutang

2011-01-01

Many studies on the anti-synchronization of nonlinear real dynamic systems have been carried out, whereas the anti-synchronization of chaotic complex systems has not been studied extensively. In this work, the anti-synchronization between a new chaotic complex system and a complex Lorenz system and that between a new chaotic complex system and a complex Lue system were separately investigated by active control and nonlinear control methods, and explicit expressions were derived for the controllers that are used to achieve the anti-synchronization of chaotic complex systems. These expressions were tested numerically and excellent agreement was found. Concerning the new chaotic complex system, we discuss its dynamical properties including dissipation, chaotic behavior, fixed points, and their stability and invariance.

Synchronization of low- and high-threshold motor units.

Science.gov (United States)

Defreitas, Jason M; Beck, Travis W; Ye, Xin; Stock, Matt S

2014-04-01

We examined the degree of synchronization for both low- and high-threshold motor unit (MU) pairs at high force levels. MU spike trains were recorded from the quadriceps during high-force isometric leg extensions. Short-term synchronization (between -6 and 6 ms) was calculated for every unique MU pair for each contraction. At high force levels, earlier recruited motor unit pairs (low-threshold) demonstrated relatively low levels of short-term synchronization (approximately 7.3% extra firings than would have been expected by chance). However, the magnitude of synchronization increased significantly and linearly with mean recruitment threshold (reaching 22.1% extra firings for motor unit pairs recruited above 70% MVC). Three potential mechanisms that could explain the observed differences in synchronization across motor unit types are proposed and discussed. Copyright © 2013 Wiley Periodicals, Inc.

The synchronization of three fractional differential systems

International Nuclear Information System (INIS)

Li Changpin; Yan Jianping

2007-01-01

In this paper, a new method is proposed and applied to the synchronization of fractional differential systems (or 'differential systems with fractional orders'), where both drive and response systems have the same dimensionality and are coupled by the driving signal. The present technique is based on the stability criterion of linear fractional systems. This method is implemented in (chaos) synchronization of the fractional Lorenz system, Chen system and Chua circuit. Numerical simulations show the present synchronization method works well

Synchronizing a class of uncertain chaotic systems

International Nuclear Information System (INIS)

Chen Maoyin; Zhou Donghua; Shang Yun

2005-01-01

This Letter deals with the synchronization of a class of uncertain chaotic systems in the drive-response framework. A robust adaptive observer based response system is designed to synchronize a given chaotic system with unknown parameters and external disturbances. Lyapunov stability ensures the global synchronization between the drive and response systems even if Lipschitz constants on function matrices and bounds on uncertainties are unknown. Numerical simulation of Genesio-Tesi system verifies the effectiveness of this scheme

Synchronization and emergence in complex systems

Indian Academy of Sciences (India)

... complex systems. Fatihcan M Atay. Synchronization, Coupled Systems and Networks Volume 77 Issue 5 November 2011 pp 855-863 ... We show how novel behaviour can emerge in complex systems at the global level through synchronization of the activities of their constituent units. Two mechanisms are suggested for ...

Time Synchronization and Distribution Mechanisms for Space Networks

Science.gov (United States)

Woo, Simon S.; Gao, Jay L.; Clare, Loren P.; Mills, David L.

2011-01-01

This work discusses research on the problems of synchronizing and distributing time information between spacecraft based on the Network Time Protocol (NTP), where NTP is a standard time synchronization protocol widely used in the terrestrial network. The Proximity-1 Space Link Interleaved Time Synchronization (PITS) Protocol was designed and developed for synchronizing spacecraft that are in proximity where proximity is less than 100,000 km distant. A particular application is synchronization between a Mars orbiter and rover. Lunar scenarios as well as outer-planet deep space mother-ship-probe missions may also apply. Spacecraft with more accurate time information functions as a time-server, and the other spacecraft functions as a time-client. PITS can be easily integrated and adaptable to the CCSDS Proximity-1 Space Link Protocol with minor modifications. In particular, PITS can take advantage of the timestamping strategy that underlying link layer functionality provides for accurate time offset calculation. The PITS algorithm achieves time synchronization with eight consecutive space network time packet exchanges between two spacecraft. PITS can detect and avoid possible errors from receiving duplicate and out-of-order packets by comparing with the current state variables and timestamps. Further, PITS is able to detect error events and autonomously recover from unexpected events that can possibly occur during the time synchronization and distribution process. This capability achieves an additional level of protocol protection on top of CRC or Error Correction Codes. PITS is a lightweight and efficient protocol, eliminating the needs for explicit frame sequence number and long buffer storage. The PITS protocol is capable of providing time synchronization and distribution services for a more general domain where multiple entities need to achieve time synchronization using a single point-to-point link.

Doença de Behçet – um desafio diagnóstico numa adolescente

Directory of Open Access Journals (Sweden)

Helena Maria Ribeiro Fernandes

2017-12-01

Full Text Available Introdução: A Doença de Behçet (DB é uma vasculite multissistémica, de diagnóstico apenas clínico, e rara em idade pediátrica. Caso Clínico: Adolescente de 17 anos com úlceras aftosas orais de repetição desde há quatro anos, sem outros sinais ou sintomas associados. Hipóteses diagnósticas como infecções, hipovitaminoses, alergia alimentar e doença celíaca foram excluídas. O diagnóstico de DB foi também ponderado, tendo realizado teste de patergia, com resultado negativo. Aos 16 anos, a doente apresenta lesões papulopustulares mentonianas, indistinguíveis de acne vulgar, e aos 17 anos, um episódio de úlceras genitais. Foi referenciada a Reumatologia pediátrica e, perante um provável diagnóstico de DB, iniciou colchicina oral, com redução do número e da recorrência das úlceras aftosas orais. Discussão: A adolescente poderá apresentar critérios suficientes para se diagnosticar DB. Este caso exemplifica a importância do acompanhamento contínuo dos doentes, realça o carácter insidioso de algumas doenças reumáticas e a dificuldade de diagnosticar DB em idade pediátrica.

Design of a new type synchronous focusing mechanism

Science.gov (United States)

Zhang, Jintao; Tan, Ruijun; Chen, Zhou; Zhang, Yongqi; Fu, Panlong; Qu, Yachen

2018-05-01

Aiming at the dual channel telescopic imaging system composed of infrared imaging system, low-light-level imaging system and image fusion module, In the fusion of low-light-level images and infrared images, it is obvious that using clear source images is easier to obtain high definition fused images. When the target is imaged at 15m to infinity, focusing is needed to ensure the imaging quality of the dual channel imaging system; therefore, a new type of synchronous focusing mechanism is designed. The synchronous focusing mechanism realizes the focusing function through the synchronous translational imaging devices, mainly including the structure of the screw rod nut, the shaft hole coordination structure and the spring steel ball eliminating clearance structure, etc. Starting from the synchronous focusing function of two imaging devices, the structure characteristics of the synchronous focusing mechanism are introduced in detail, and the focusing range is analyzed. The experimental results show that the synchronous focusing mechanism has the advantages of ingenious design, high focusing accuracy and stable and reliable operation.

Acurácia do diagnóstico de enfermagem “disposição para melhora da esperança” em pacientes renais crônicos

Directory of Open Access Journals (Sweden)

Renan Alves Silva

2017-07-01

Full Text Available RESUMO Objetivo Analisar a acurácia do diagnóstico “Disposição para melhora da Esperança” em pacientes renais crônicos. Método Estudo transversal com 62 pacientes em clínica de hemodiálise entre agosto a novembro de 2015. Utilizou-se a Escala de Esperança de Herth para a construção das definições das características definidoras da North American Nursing Diagnosis Association International. Analisaram-se medidas de sensibilidade, especificidade, valor preditivo, razão de verossimilhança e odds ratio das características definidoras do diagnóstico. Resultados 82,22% apresentaram o diagnóstico. Verificou-se que as características definidoras “Expressa desejo de intensificar a coerência entre expectativas e desejos” e “Expressa o desejo de reforçar a resolução de problemas para alcançar as metas” aumentou em onze e cinco vezes, respectivamente, a chance de possuírem o diagnóstico. Conclusão “Expressa desejo de intensificar a coerência entre expectativas e desejos” e “Expressa o desejo de reforçar a resolução de problemas para alcançar as metas” apresentaram boas medidas de acurácia.

Neumatoscopia e impedanciometría en el diagnóstico de la otitis media con efusión

OpenAIRE

Gilberto Eduardo Marrugo Pardo; Diana Lucía Gómez Rodríguez

2005-01-01

Antecedentes: las consecuencias de la otitis media con efusión crónica en la audición, en el desarrollo cognitivo, lingüístico y de habilidades comunicativas son las principales razones a considerar para la búsqueda, diagnóstico y tratamiento adecuado de esta patología en los niños.  Objetivo: comparar el rendimiento operativo de la neumatoscopia e impedanciometria como métodos diagnósticos de la efusión del oído medio.  Material y métodos: estudio de pruebas diagnósticas, recolección p...

Transmission delays in hardware clock synchronization

Science.gov (United States)

Shin, Kang G.; Ramanathan, P.

1988-01-01

Various methods, both with software and hardware, have been proposed to synchronize a set of physical clocks in a system. Software methods are very flexible and economical but suffer an excessive time overhead, whereas hardware methods require no time overhead but are unable to handle transmission delays in clock signals. The effects of nonzero transmission delays in synchronization have been studied extensively in the communication area in the absence of malicious or Byzantine faults. The authors show that it is easy to incorporate the ideas from the communication area into the existing hardware clock synchronization algorithms to take into account the presence of both malicious faults and nonzero transmission delays.

Synchronization of two coupled turbulent fires

Science.gov (United States)

Takagi, Kazushi; Gotoda, Hiroshi; Miyano, Takaya; Murayama, Shogo; Tokuda, Isao T.

2018-04-01

We numerically study the scale-free nature of a buoyancy-induced turbulent fire and synchronization of two coupled turbulent fires. A scale-free structure is detected in weighted networks between vortices, while its lifetime obeys a clear power law, indicating intermittent appearances, disappearances, and reappearances of the scale-free property. A significant decrease in the distance between the two fire sources gives rise to a synchronized state in the near field dominated by the unstable motion of large-scale of transverse vortex rings. The synchronized state vanishes in the far field forming well-developed turbulent plumes, regardless of the distance between the two fire sources.

Chaos synchronization between two different chaotic dynamical systems

International Nuclear Information System (INIS)

Park, Ju H.

2006-01-01

This work presents chaos synchronization between two different chaotic systems by nonlinear control laws. First, synchronization problem between Genesio system and Rossler system has been investigated, and then the similar approach is applied to the synchronization problem between Genesio system and a new chaotic system developed recently in the literature. The control performances are verified by two numerical examples

Diagnósticos de enfermagem em pacientes diabéticos em uso de insulina Diagnósticos de enfermería para pacientes diabeticos en uso de la insulina Nursing diagnoses for diabetic patients using insulin

Directory of Open Access Journals (Sweden)

Tânia Alves Canata Becker

2008-12-01

Full Text Available Trata-se de um estudo descritivo exploratório que tem como objetivo identificar os diagnósticos de enfermagem em pacientes diabéticos em uso de insulina, através de estudo de casos múltiplos. Os dados foram obtidos pelo pesquisador por meio de exame físico e a técnica de entrevista dirigida baseada na Teoria de Autocuidado de Orem. Após a coleta de dados, procedeu-se a identificação dos diagnósticos de enfermagem nomeados de acordo com a Taxonomia II da NANDA, utilizando o processo de raciocínio diagnóstico de Risner. Identificou-se seis diagnósticos com freqüência superior a 50%: integridade da pele prejudicada (100%, risco para infecção (100%, comportamento de busca de saúde (57,2%, padrão do sono perturbado (57,2%, dor crônica (57,2% e risco para disfunção neurovascular periférica (57,2%. Destaca-se a pertinência da aplicabilidade do processo de enfermagem baseado em Orem para identificação dos requisitos de autocuidado com maior demanda e a importância do planejamento do cuiadado de enfermagem prestado a essa clientela.Estudio de tipo descriptivo-exploratorio, cuyo objetivo fue identificar los diagnósticos de enfermaría en pacientes diabéticos en uso de la insulina, a través de estudio de caso múltiplos. Los datos fueron recogidos por el investigador por medio de la examinación física y de la técnica de la entrevista dirigida en el instrumento basado en la Teoría del Autocuidado de Orem. Después de la recogida de datos, de acuerdo con procedido él la identificación a los diagnósticos de la NANDA, usando el proceso del razonamiento de diagnóstico de Risner. Los diagnósticos de enfermería, identificados segundo Taxonomia II de la NANDA con frecuencia superior a 50,0% fueron seis: integridad de piel perjudicada (100%, riesgo para infección (100%, comportamiento de busca de la salud (57,2%, disturbio del sueño (57,2%, dolor crónico (57,2% riesgo para disfunción neurovascular periférica (57,2, fue

Chaos synchronization in autonomous chaotic system via hybrid feedback control

International Nuclear Information System (INIS)

Yang Lixin; Chu Yandong; Zhang Jiangang; Li Xianfeng; Chang Yingxiang

2009-01-01

This paper presents the synchronization of chaos by designing united controller. First, this method is implemented in synchronization of a simple system, then we realize the synchronization of Lue hyperchaotic system, we also take tracking control to realize the synchronization of Lue hyperchaotic system. Comparing with results, we can find that hybrid feedback control approach is more effective than tracking control for hyperchaotic system. Numerical simulations show the united synchronization method works well.

Output synchronization of chaotic systems under nonvanishing perturbations

Energy Technology Data Exchange (ETDEWEB)

Lopez-Mancilla, Didier [Departamento de Ciencias Exactas y Tecnologicas, Centro Universitario de los Lagos, Universidad de Guadalajara (CULagos-UdeG), Enrique Diaz de Leon s/n, 47460 Lagos de Moreno, Jal. (Mexico)], E-mail: didier@uabc.mx; Cruz-Hernandez, Cesar [Electronics and Telecommunications Department, Scientific Research and Advanced Studies of Ensenada (CICESE), Km. 107, Carretera Tijuana-Ensenada, 22860 Ensenada, B.C. (Mexico)], E-mail: ccruz@cicese.mx

2008-08-15

In this paper, an analysis for chaos synchronization under nonvanishing perturbations is presented. In particular, we use model-matching approach from nonlinear control theory for output synchronization of identical and nonidentical chaotic systems under nonvanishing perturbations in a master-slave configuration. We show that the proposed approach is indeed suitable to synchronize a class of perturbed slaves with a chaotic master system; that is the synchronization error trajectories remain bounded if the perturbations satisfy some conditions. In order to illustrate this robustness synchronization property, we present two cases of study: (i) for identical systems, a pair of coupled Roessler systems, the first like a master and the other like a perturbed slave, and (ii) for nonidentical systems, a Chua's circuit driving a Roessler/slave system with a perturbed control law, in both cases a quantitative analysis on the perturbation is included.

Output synchronization of chaotic systems under nonvanishing perturbations

International Nuclear Information System (INIS)

Lopez-Mancilla, Didier; Cruz-Hernandez, Cesar

2008-01-01

In this paper, an analysis for chaos synchronization under nonvanishing perturbations is presented. In particular, we use model-matching approach from nonlinear control theory for output synchronization of identical and nonidentical chaotic systems under nonvanishing perturbations in a master-slave configuration. We show that the proposed approach is indeed suitable to synchronize a class of perturbed slaves with a chaotic master system; that is the synchronization error trajectories remain bounded if the perturbations satisfy some conditions. In order to illustrate this robustness synchronization property, we present two cases of study: (i) for identical systems, a pair of coupled Roessler systems, the first like a master and the other like a perturbed slave, and (ii) for nonidentical systems, a Chua's circuit driving a Roessler/slave system with a perturbed control law, in both cases a quantitative analysis on the perturbation is included

Global synchronization algorithms for the Intel iPSC/860

Science.gov (United States)

Seidel, Steven R.; Davis, Mark A.

1992-01-01

In a distributed memory multicomputer that has no global clock, global processor synchronization can only be achieved through software. Global synchronization algorithms are used in tridiagonal systems solvers, CFD codes, sequence comparison algorithms, and sorting algorithms. They are also useful for event simulation, debugging, and for solving mutual exclusion problems. For the Intel iPSC/860 in particular, global synchronization can be used to ensure the most effective use of the communication network for operations such as the shift, where each processor in a one-dimensional array or ring concurrently sends a message to its right (or left) neighbor. Three global synchronization algorithms are considered for the iPSC/860: the gysnc() primitive provided by Intel, the PICL primitive sync0(), and a new recursive doubling synchronization (RDS) algorithm. The performance of these algorithms is compared to the performance predicted by communication models of both the long and forced message protocols. Measurements of the cost of shift operations preceded by global synchronization show that the RDS algorithm always synchronizes the nodes more precisely and costs only slightly more than the other two algorithms.

Efficient synchronization of structurally adaptive coupled Hindmarsh-Rose neurons

International Nuclear Information System (INIS)

Moujahid, A.; D'Anjou, A.; Torrealdea, F.J.; Torrealdea, F.

2011-01-01

Highlights: → Neural activity might be constrained by a requirement of energy efficiency. → Signaling in synchrony is a normal way to propagate information between neurons. → Quality of synchrony affects the capacity to exchange information and the energy cost. → Adaptive mechanism leads to high degree of synchronization between nonidentical neurons. - Abstract: The use of spikes to carry information between brain areas implies complete or partial synchronization of the neurons involved. The degree of synchronization reached by two coupled systems and the energy cost of maintaining their synchronized behavior is highly dependent on the nature of the systems. For non-identical systems the maintenance of a synchronized regime is energetically a costly process. In this work, we study conditions under which two non-identical electrically coupled neurons can reach an efficient regime of synchronization at low energy cost. We show that the energy consumption required to keep the synchronized regime can be spontaneously reduced if the receiving neuron has adaptive mechanisms able to bring its biological parameters closer in value to the corresponding ones in the sending neuron.

Master-Slave Synchronization of 4D Hyperchaotic Rabinovich Systems

Directory of Open Access Journals (Sweden)

Ke Ding

2018-01-01

Full Text Available This paper is concerned with master-slave synchronization of 4D hyperchaotic Rabinovich systems. Compared with some existing papers, this paper has two contributions. The first contribution is that the nonlinear terms of error systems remained which inherit nonlinear features from master and slave 4D hyperchaotic Rabinovich systems, rather than discarding nonlinear features of original hyperchaotic Rabinovich systems and eliminating those nonlinear terms to derive linear error systems as the control methods in some existing papers. The second contribution is that the synchronization criteria of this paper are global rather than local synchronization results in some existing papers. In addition, those synchronization criteria and control methods for 4D hyperchaotic Rabinovich systems are extended to investigate the synchronization of 3D chaotic Rabinovich systems. The effectiveness of synchronization criteria is illustrated by three simulation examples.

Robust fixed-time synchronization of delayed Cohen-Grossberg neural networks.

Science.gov (United States)

Wan, Ying; Cao, Jinde; Wen, Guanghui; Yu, Wenwu

2016-01-01

The fixed-time master-slave synchronization of Cohen-Grossberg neural networks with parameter uncertainties and time-varying delays is investigated. Compared with finite-time synchronization where the convergence time relies on the initial synchronization errors, the settling time of fixed-time synchronization can be adjusted to desired values regardless of initial conditions. Novel synchronization control strategy for the slave neural network is proposed. By utilizing the Filippov discontinuous theory and Lyapunov stability theory, some sufficient schemes are provided for selecting the control parameters to ensure synchronization with required convergence time and in the presence of parameter uncertainties. Corresponding criteria for tuning control inputs are also derived for the finite-time synchronization. Finally, two numerical examples are given to illustrate the validity of the theoretical results. Copyright © 2015 Elsevier Ltd. All rights reserved.

System and method for time synchronization in a wireless network

Science.gov (United States)

Gonia, Patrick S.; Kolavennu, Soumitri N.; Mahasenan, Arun V.; Budampati, Ramakrishna S.

2010-03-30

A system includes multiple wireless nodes forming a cluster in a wireless network, where each wireless node is configured to communicate and exchange data wirelessly based on a clock. One of the wireless nodes is configured to operate as a cluster master. Each of the other wireless nodes is configured to (i) receive time synchronization information from a parent node, (ii) adjust its clock based on the received time synchronization information, and (iii) broadcast time synchronization information based on the time synchronization information received by that wireless node. The time synchronization information received by each of the other wireless nodes is based on time synchronization information provided by the cluster master so that the other wireless nodes substantially synchronize their clocks with the clock of the cluster master.

High Speed Frame Synchronization and Viterbi Decoding

DEFF Research Database (Denmark)

Paaske, Erik; Justesen, Jørn; Larsen, Knud J.

1996-01-01

The purpose of Phase 1 of the study is to describe the system structure and algorithms in sufficient detail to allow drawing the high level architecture of units containing frame synchronization and Viterbi decoding. The systems we consider are high data rate space communication systems. Also...... components. Node synchronization performed within a Viterbi decoder is discussed, and algorithms for frame synchronization are described and analyzed. We present a list of system configurations that we find potentially useful. Further, the high level architecture of units that contain frame synchronization...... and various other functions needed in a complete system is presented. Two such units are described, one for placement before the Viterbi decoder and another for placement after the decoder. The high level architectures of three possible implementations of Viterbi decoders are described: The first...

High Speed Frame Synchronization and Viterbi Decoding

DEFF Research Database (Denmark)

Paaske, Erik; Justesen, Jørn; Larsen, Knud J.

1998-01-01

The study has been divided into two phases. The purpose of Phase 1 of the study was to describe the system structure and algorithms in sufficient detail to allow drawing the high level architecture of units containing frame synchronization and Viterbi decoding. After selection of which specific...... potentially useful.Algorithms for frame synchronization are described and analyzed. Further, the high level architecture of units that contain frame synchronization and various other functions needed in a complete system is presented. Two such units are described, one for placement before the Viterbi decoder...... towards a realization in an FPGA.Node synchronization performed within a Viterbi decoder is discussed, and the high level architectures of three possible implementations of Viterbi decoders are described: The first implementation uses a number of commercially available decoders while the the two others...

Synchronous correlation matrices and Connes’ embedding conjecture

Energy Technology Data Exchange (ETDEWEB)

Dykema, Kenneth J., E-mail: kdykema@math.tamu.edu [Department of Mathematics, Texas A& M University, College Station, Texas 77843-3368 (United States); Paulsen, Vern, E-mail: vern@math.uh.edu [Department of Mathematics, University of Houston, Houston, Texas 77204 (United States)

2016-01-15

In the work of Paulsen et al. [J. Funct. Anal. (in press); preprint arXiv:1407.6918], the concept of synchronous quantum correlation matrices was introduced and these were shown to correspond to traces on certain C*-algebras. In particular, synchronous correlation matrices arose in their study of various versions of quantum chromatic numbers of graphs and other quantum versions of graph theoretic parameters. In this paper, we develop these ideas further, focusing on the relations between synchronous correlation matrices and microstates. We prove that Connes’ embedding conjecture is equivalent to the equality of two families of synchronous quantum correlation matrices. We prove that if Connes’ embedding conjecture has a positive answer, then the tracial rank and projective rank are equal for every graph. We then apply these results to more general non-local games.

Multicellular models of intercellular synchronization in circadian neural networks

International Nuclear Information System (INIS)

Henson, Michael A.

2013-01-01

The circadian clock generates 24 h rhythms that drive physiological and behavioral processes in a diverse range of organisms including microbes, plants, insects, and mammals. Recent experimental advances have produced improved understanding of the molecular mechanisms involved in circadian rhythm generation at the single cell level. However, the intercellular mechanisms that allow large populations of coupled pacemaker cells to synchronize and coordinate their rhythms remain poorly understood. The purpose of this article is to review recent progress in dynamic modeling of the circadian clock with a focus on multicellular models required to describe cell population synchronization. Mammalian systems are emphasized to illustrate the highly heterogeneous structure and rich dynamical behavior of multicellular circadian systems. Available multicellular models are characterized with respect to their single cell descriptions, intercellular coupling mechanisms, and network topologies. Examples drawn from our own research are used to demonstrate the advantages associated with integrating detailed single cell models within realistic multicellular networks for prediction of mammalian system dynamics. Mathematical modeling is shown to represent a powerful tool for understanding the intracellular and intercellular mechanisms utilized to robustly synchronize large populations of highly heterogeneous and sparsely coupled single cell oscillators. The article concludes with some possible directions for future research

Memory-based frame synchronizer. [for digital communication systems

Science.gov (United States)

Stattel, R. J.; Niswander, J. K. (Inventor)

1981-01-01

A frame synchronizer for use in digital communications systems wherein data formats can be easily and dynamically changed is described. The use of memory array elements provide increased flexibility in format selection and sync word selection in addition to real time reconfiguration ability. The frame synchronizer comprises a serial-to-parallel converter which converts a serial input data stream to a constantly changing parallel data output. This parallel data output is supplied to programmable sync word recognizers each consisting of a multiplexer and a random access memory (RAM). The multiplexer is connected to both the parallel data output and an address bus which may be connected to a microprocessor or computer for purposes of programming the sync word recognizer. The RAM is used as an associative memory or decorder and is programmed to identify a specific sync word. Additional programmable RAMs are used as counter decoders to define word bit length, frame word length, and paragraph frame length.

Synchronization of Harb-Zohdy Chaotic System via Back-Stepping Design

Directory of Open Access Journals (Sweden)

M. R. Shamsyeh Zahedi∗

2015-12-01

Full Text Available This paper is concerned with the problem of synchronization of the Harb-Zohdy chaotic system using the back-stepping. Based on the stability theory, the control for the synchronization of chaotic systems Harb-Zohdy is considered without unknown parameters. Next, an adaptive back-stepping control law is derived to generate an error signal between the drive and response systems Harb-Zohdy with an uncertain parameter asymptotically synchronized. Finally, this method is extended to synchronize the system with two unknown parameters. Note that the method presented here needs only one controller to realize the synchronization. Numerical simulations indicate the effectiveness of the proposed chaos synchronization scheme

Analysis of ECT Synchronization Performance Based on Different Interpolation Methods

Directory of Open Access Journals (Sweden)

Yang Zhixin

2014-01-01

Full Text Available There are two synchronization methods of electronic transformer in IEC60044-8 standard: impulsive synchronization and interpolation. When the impulsive synchronization method is inapplicability, the data synchronization of electronic transformer can be realized by using the interpolation method. The typical interpolation methods are piecewise linear interpolation, quadratic interpolation, cubic spline interpolation and so on. In this paper, the influences of piecewise linear interpolation, quadratic interpolation and cubic spline interpolation for the data synchronization of electronic transformer are computed, then the computational complexity, the synchronization precision, the reliability, the application range of different interpolation methods are analyzed and compared, which can serve as guide studies for practical applications.

Synchronization of Coupled Nonidentical Fractional-Order Hyperchaotic Systems

Directory of Open Access Journals (Sweden)

Zhouchao Wei

2011-01-01

Full Text Available Synchronization of coupled nonidentical fractional-order hyperchaotic systems is addressed by the active sliding mode method. By designing an active sliding mode controller and choosing proper control parameters, the master and slave systems are synchronized. Furthermore, synchronizing fractional-order hyperchaotic Lorenz system and fractional-order hyperchaotic Chen system is performed to show the effectiveness of the proposed controller.

Recién nacidos pequeños para la edad gestacional: sensibilidad del diagnóstico y su resultado

OpenAIRE

Díaz, Lucía; Cóppola, Francisco; Vargas, Diego; Quiñones, Patricia

2014-01-01

OBJETIVODeterminar la sensibilidad en el diagnóstico clínico-ecográfico de pequeños para la edad gestacional (PEG) y valorar el impacto del diagnóstico prenatal en la tasa de cesáreas y los resultados neonatales (Apgar y gasometría).MATERIAL Y MÉTODOEstudio descriptivo-analítico retrospectivo.RESULTADOSDe 4548 nacidos vivos, se detectó un total de 379 PEG; 99 casos (26%) tenían diagnóstico previo de RCIU. Los resultados neonatales de depresión, acidosis y Apgar bajo no fueron diferentes en el...

Notas sobre o diagnóstico diferencial da psicose e do autismo na infância

Directory of Open Access Journals (Sweden)

Kupfer M. Cristina M.

2000-01-01

Full Text Available O artigo aborda a discussão em torno do diagnóstico diferencial da psicose e do autismo infantis, mostrando a falta de concordância entre os autores psicanalistas. Busca, em seguida, delinear um diagnóstico diferencial a partir da proposição de que no autismo falha a função materna e na psicose infantil falha a função paterna.

Discrepancias entre diagnósticos clínicos y hallazgos de autopsia

Directory of Open Access Journals (Sweden)

María Virginia Bürgesser

2011-04-01

Full Text Available El objetivo principal del presente trabajo fue identificar las discrepancias clínico-patológicas en las autopsias realizadas en la institución. Se revisaron 53 autopsias de casos clínicos en adultos en el período comprendido entre enero de 2005 y junio de 2009, realizadas en el servicio de Anatomía Patológica del Hospital Privado de Córdoba, Argentina. Se excluyeron seis debido a información insuficiente. Se aplicó la clasificación de Goldman y col. para establecer las discrepancias clínico-patológicas entre los diagnósticos pre y post-mortem. Los diagnósticos clínicos más frecuentes fueron las infecciones respiratorias y el tromboembolismo pulmonar agudo. Los hallazgos de autopsia más frecuentes fueron las infecciones respiratorias y el infarto agudo de miocardio. Se detectaron 17 discrepancias mayores y 30 concordancias, no se detectaron discrepancias menores. Las infecciones respiratorias fueron la principal causa de error, seguidas por el infarto agudo de miocardio. Concluimos que en 17/47 (37% de los casos se realizó un diagnóstico clínico diferente al post-mortem, y que las infecciones respiratorias constituyen el principal tipo de error. Se sugiere adoptar estrategias informativas y educativas, revalorizar la autopsia y las prácticas clínicas tradicionales.

Synchronization System for Next Generation Light Sources

Energy Technology Data Exchange (ETDEWEB)

Zavriyev, Anton [MagiQ Technologies, Inc., Somerville, MA (United States)

2014-03-27

An alternative synchronization technique – one that would allow explicit control of the pulse train including its repetition rate and delay is clearly desired. We propose such a scheme. Our method is based on optical interferometry and permits synchronization of the pulse trains generated by two independent mode-locked lasers. As the next generation x-ray sources will be driven by a clock signal derived from a mode-locked optical source, our technique will provide a way to synchronize x-ray probe with the optical pump pulses.

Critical thinking and accuracy of nurses' diagnoses. Part I: risk of low accuracy diagnoses and new views of critical thinking Pensamiento crítico y precisión de los diagnósticos de enfermería. I Parte: riesgo de diagnósticos de baja precisión y nuevas perspectivas del pensamiento crítico Pensamento crítico e acurácia dos diagnósticos de enfermagem. Parte I: risco de diagnósticos de baixa acurácia e novas visões do pensamento crítico

Directory of Open Access Journals (Sweden)

Margaret Lunney

2003-06-01

Full Text Available Interpretations of patient data are complex and diverse, contributing to a risk of low accuracy nursing diagnoses. This risk is confirmed in research findings that accuracy of nurses' diagnoses varied widely from high to low. Highly accurate diagnoses are essential, however, to guide nursing interventions for the achievement of positive health outcomes. Development of critical thinking abilities is likely to improve accuracy of nurses' diagnoses. Newer views of critical thinking serve as a basis for critical thinking in nursing. Seven cognitive skills and ten habits of mind are identified as dimensions of critical thinking for use in the diagnostic process.La diversidad y complejidad en la interpretación de los datos de los pacientes contribuyen al riesgo de que los diagnósticos de enfermería sean menos precisos. Pese a que los hallazgos en investigación confirmen este riesgo, debido a la enorme variación en la precisión, son esenciales diagnósticos exactos para orientar las intervenciones de enfermería en el logro de resultados positivos en la asistencia a la salud. Desarrollar habilidades para el pensamiento crítico es mejorar la precisión de esos diagnósticos. Las nuevas perspectivas del pensamiento crítico ofrecen una base para el alcance de este objetivo. Fueron identificadas siete habilidades cognitivas y diez formas de pensar como dimensiones del pensamiento crítico en el uso del proceso de diagnóstico.A diversidade e complexidade na interpretação dos dados dos pacientes contribuem para o risco de menor acurácia dos diagnósticos de enfermagem. Embora os achados em pesquisa confirmem esse risco pela enorme variação na acurácia, diagnósticos precisos são essenciais para direcionar as intervenções de enfermagem para o alcance de resultados positivos na saúde. É provável que o desenvolvimento de habilidades de pensamento crítico melhore a acurácia dos diagnósticos feitos pelas enfermeiras. Novas visões do

Partial synchronization in diffusively time-delay coupled oscillator networks

NARCIS (Netherlands)

Steur, E.; Oguchi, T.; Leeuwen, van C.; Nijmeijer, H.

2012-01-01

We study networks of diffusively time-delay coupled oscillatory units and we show that networks with certain symmetries can exhibit a form of incomplete synchronization called partial synchronization. We present conditions for the existence and stability of partial synchronization modes in networks

Blended synchronous learning environment: Student perspectives

Directory of Open Access Journals (Sweden)

Conklina Sheri

2017-06-01

Full Text Available Distance education environments can take many forms, from asynchronous to blended synchronous environments. Blended synchronous learning environment (BSLE can be defined as an innovative setting in which students can decide to attend classes either face-to-face or via a synchronous virtual connection. Many educators are unfamiliar teaching in BSLE because of lack of experience or exposure to this delivery method. Thus, it is important to understand the optimal organisational structures and the effective management of BSLE courses to facilitate student learning and interaction. Seeking to understand this teaching method, an exploratory mixed-method study was conducted to examine graduate students’ perceptions of the BSLE. Quantitative and qualitative data was collected from a questionnaire and analysed. The findings revealed that students were satisfied with the BSLE, interactions, and the instructor. However, findings showed that the instructor divided attention between face-to-face and online synchronous students, which can cause cognitive overload and compromise the quality of instruction. Additionally, this study suggests that technical difficulties can affect students’ satisfaction with BSLE courses. Implications for further research and limitations are discussed.

Synchronicity and the meaning-making psyche.

Science.gov (United States)

Colman, Warren

2011-09-01

This paper contrasts Jung's account of synchronicity as evidence of an objective principle of meaning in Nature with a view that emphasizes human meaning-making. All synchronicities generate indicative signs but only where this becomes a 'living symbol' of a transcendent intentionality at work in a living universe does synchronicity generate the kind of symbolic meaning that led Jung to posit the existence of a Universal Mind. This is regarded as a form of personal, experiential knowledge belonging to the 'imaginal world of meaning' characteristic of the 'primordial mind', as opposed to the 'rational world of knowledge' in which Jung attempted to present his experiences as if they were empirically and publicly verifiable. Whereas rational knowledge depends on a form of meaning in which causal chains and logical links are paramount, imaginal meaning is generated by forms of congruent correspondence-a feature that synchronicity shares with metaphor and symbol-and the creation of narratives by means of retroactive organization of its constituent elements. © 2011, The Society of Analytical Psychology.

Research on synchronization technology of frequency hopping communication system

Science.gov (United States)

Zhao, Xiangwu; Quan, Houde; Cui, Peizhang

2018-05-01

Frequency Hopping (FH) communication is a technology of spread spectrum communication. It has strong anti-interference, anti-interception and security capabilities, and has been widely applied in the field of communications. Synchronization technology is one of the most crucial technologies in frequency hopping communication. The speed of synchronization establishment and the reliability of synchronous system directly affect the performance of frequency hopping communication system. Therefore, the research of synchronization technology in frequency hopping communication has important value.

Sindroma de Churg-Strauss: um diagnóstico de asma e eosinofília

Directory of Open Access Journals (Sweden)

Tiago Tribolet de Abreu

2001-11-01

Full Text Available RESUMO: Introdução: O S. de Churg-Strauss (SCS é uma entidade clínica em que um quadro de asma e eosinofilia coexiste com um atingimento multissistémico.Caso-clínico: Um homem de 63 anos, com diagnóstico de asma e rinite alérgica desde os 55 anos, inicia um quadro de febre, artrite, polineuropatia e hematúria. Verificou-se a existência de eosinofilia marcada e sinusopatia maxilar e etmoidal bilateral. Iniciou corticoterapia, com regressão completa do quadro clínico e laboratorial. Está actualmente assintomático, com Prednisolona 5 mg/dia.Discussão: Revendo os diagnósticos diferenciais de doença pulmonar com eosinofilia,verificámos que a presença de atingimento extrapulmonar permite considerarmos o SCS e o S. hipereosinofílico idiopático como únicas hipóteses. A existência de asma selecciona o SCS como o diagnóstico correcto.Conclusões: a perante um doente com asma e eosinofilia (superior a 10%, o S. de Churg-Strauss é um diagnóstico a ter sempre presente; b o diagnóstico é principalmente clínico, de acordo com os critérios de classificação; c a corticoterapia é muito eficaz e o seu desmame lento permite doses de manutenção baixas.REV PORT PNEUMOL 2001; VII (6: ABSTRACT: Background: The Churg-Strauss syndrome (CSS is a disease in which asthma and eosinophilia occur with multisystemic manifestations.Case-report: A 63 year old male, with a diagnosis of asthma and allergic rhinitis for 8 years, has fever, arthritis, peripheral neuropathy and hematuria. Marked eosinophilia and sinusitis were found. Corticosteroids were given, with complete clinical and laboratorial remission. The patient is asymptomatic with a daily dose of 5 mg of Prednisolone.Discussion: Reviewing the differential diagnosis of pulmonary disease and eosinophilia, the extrapulmonary involvement only exists in the CSS and the hypereosinophilic syndrome. Asthma is present only in the former, and so the Churg-Strauss syndrome was the correct

Synchronization in an array of coupled Boolean networks

International Nuclear Information System (INIS)

Li, Rui; Chu, Tianguang

2012-01-01

This Letter presents an analytical study of synchronization in an array of coupled deterministic Boolean networks. A necessary and sufficient criterion for synchronization is established based on algebraic representations of logical dynamics in terms of the semi-tensor product of matrices. Some basic properties of a synchronized array of Boolean networks are then derived for the existence of transient states and the upper bound of the number of fixed points. Particularly, an interesting consequence indicates that a “large” mismatch between two coupled Boolean networks in the array may result in loss of synchrony in the entire system. Examples, including the Boolean model of coupled oscillations in the cell cycle, are given to illustrate the present results. -- Highlights: ► We analytically study synchronization in an array of coupled Boolean networks. ► The study is based on the algebraic representations of logical dynamics. ► A necessary and sufficient algebraic criterion for synchronization is established. ► It reveals some basic properties of a synchronized array of Boolean networks. ► A large mismatch between two coupled networks may result in the loss of synchrony.

Diagnóstico y tratamiento de la periodontitis agresiva

Directory of Open Access Journals (Sweden)

Ricardo Benza-Bedoya

Full Text Available Resumen: La periodontitis agresiva es una enfermedad de baja prevalencia, multifactorial, de avance rápido, sin compromiso sistémico, con alteraciones inmunológicas, con fuerte influencia genética, agregación familiar y generalmente de instalación temprana. Tiene dos formas: una localizada, y otra generalizada. No está debidamente aclarado, si se trata de una enfermedad periodontal diferente a otras o si es la expresión fenotípica de una periodontitis crónica en pacientes susceptibles. Su protocolo diagnóstico incluye una historia médica dental, examen clínico periodontal y examen radiológico. El tratamiento de la periodontitis agresiva incluye principalmente, control de higiene bucal, raspaje y alisado radicular, complementado con terapia antibiótica sistémica y local. La terapia quirúrgica depende de los casos. La terapia de mantenimiento es imprescindible para lograr mejores resultados. El objetivo de este artículo fue revisar los protocolos diagnósticos y terapéuticos y proponer un flujograma de tratamiento en base a evidencias científicas recientes.

Synthesizing Modular Invariants for Synchronous Code

Directory of Open Access Journals (Sweden)

Pierre-Loic Garoche

2014-12-01

Full Text Available In this paper, we explore different techniques to synthesize modular invariants for synchronous code encoded as Horn clauses. Modular invariants are a set of formulas that characterizes the validity of predicates. They are very useful for different aspects of analysis, synthesis, testing and program transformation. We describe two techniques to generate modular invariants for code written in the synchronous dataflow language Lustre. The first technique directly encodes the synchronous code in a modular fashion. While in the second technique, we synthesize modular invariants starting from a monolithic invariant. Both techniques, take advantage of analysis techniques based on property-directed reachability. We also describe a technique to minimize the synthesized invariants.

Systems and methods for self-synchronized digital sampling

Science.gov (United States)

Samson, Jr., John R. (Inventor)

2008-01-01

Systems and methods for self-synchronized data sampling are provided. In one embodiment, a system for capturing synchronous data samples is provided. The system includes an analog to digital converter adapted to capture signals from one or more sensors and convert the signals into a stream of digital data samples at a sampling frequency determined by a sampling control signal; and a synchronizer coupled to the analog to digital converter and adapted to receive a rotational frequency signal from a rotating machine, wherein the synchronizer is further adapted to generate the sampling control signal, and wherein the sampling control signal is based on the rotational frequency signal.

Development of high-performance sintered friction material for synchronizer ring; Koseino shoketsu synchronizer ring masatsu zairyo no kaihatsu

Energy Technology Data Exchange (ETDEWEB)

Miyajima, K; Fuwa, Y; Okajima, H; Yoshikawa, K [Toyota Motor Corp., Aichi (Japan); Nakamura, M [Japan Powder Metallurgy Co. Ltd., Tokyo (Japan)

1997-10-01

Increasing vehicle speed and power, high-performance synchronizer ring of manual transmission is required. We develop double layer sintered synchronizer ring for high performance and cost reduction. The main structure is consisted of ferrous sinter for high strength. In this paper, friction materials of sintered synchronizer ring are studied. We can get the good friction and anti-wear property by means of hard particles (FeTi, ZrO2), solid lubricant (Graphite) and suitable porosity in brass sinter matrix. And we also achieve high joining strength between double layers adding Cu-P material. 6 refs., 13 figs., 2 tabs.

Principles of synchronous digital hierarchy

CERN Document Server

Jain, Rajesh Kumar

2012-01-01

The book presents the current standards of digital multiplexing, called synchronous digital hierarchy, including analog multiplexing technologies. It is aimed at telecommunication professionals who want to develop an understanding of digital multiplexing and synchronous digital hierarchy in particular and the functioning of practical telecommunication systems in general. The text includes all relevant fundamentals and provides a handy reference for problem solving or defining operations and maintenance strategies. The author covers digital conversion and TDM principles, line coding and digital

Environmental conditions synchronize waterbird mortality events in the Great Lakes

Science.gov (United States)

Prince, Karine; Chipault, Jennifer G.; White, C. LeAnn; Zuckerberg, Benjamin

2018-01-01

Since the 1960s, periodic outbreaks of avian botulism type E have contributed to large-scale die-offs of thousands of waterbirds throughout the Great Lakes of the United States. In recent years, these events have become more common and widespread. Occurring during the summer and autumn months, the prevalence of these die-offs varies across years and is often associated with years of warmer lake temperatures and lower water levels. Little information exists on how environmental conditions mediate the spatial and temporal characteristics of mortality events.In 2010, a citizen science programme, Avian Monitoring for Botulism Lakeshore Events (AMBLE), was launched to enhance surveillance efforts and detect the appearance of beached waterbird carcasses associated with avian botulism type E outbreaks in northern Lake Michigan. Using these data, our goal was to quantify the within-year characteristics of mortality events for multiple species, and to test whether the synchrony of these events corresponded to fluctuations in two environmental factors suspected to be important in the spread of avian botulism: water temperature and the prevalence of green macroalgae.During two separate events of mass waterbird mortality, we found that the detection of bird carcasses was spatially synchronized at scales of c. 40 km. Notably, the extent of this spatial synchrony in avian mortality matched that of fluctuations in lake surface water temperatures and the prevalence of green macroalgae.Synthesis and applications. Our findings are suggestive of a synchronizing effect where warmer lake temperatures and the appearance of macroalgae mediate the characteristics of avian mortality. In future years, rising lake temperatures and a higher propensity of algal masses could lead to increases in the magnitude and synchronization of avian mortality due to botulism. We advocate that citizen-based monitoring efforts are critical for identifying the potential environmental conditions associated

Synchronization in Coupled Oscillators with Two Coexisting Attractors

International Nuclear Information System (INIS)

Han-Han, Zhu; Jun-Zhong, Yang

2008-01-01

Dynamics in coupled Duffing oscillators with two coexisting symmetrical attractors is investigated. For a pair of Duffing oscillators coupled linearly, the transition to the synchronization generally consists of two steps: Firstly, the two oscillators have to jump onto a same attractor, then they reach synchronization similarly to coupled monostable oscillators. The transition scenarios to the synchronization observed are strongly dependent on initial conditions. (general)

Detection of generalized synchronization using echo state networks

OpenAIRE

Ibáñez-Soria, D.; García Ojalvo, Jordi; Soria Frisch, Aureli; Ruffini, G.

2018-01-01

Generalized synchronization between coupled dynamical systems is a phenomenon of relevance in applications that range from secure communications to physiological modelling. Here, we test the capabilities of reservoir computing and, in particular, echo state networks for the detection of generalized synchronization. A nonlinear dynamical system consisting of two coupled Rössler chaotic attractors is used to generate temporal series consisting of time-locked generalized synchronized sequences i...

On the Integration and Synchronization of the Economic Development

Directory of Open Access Journals (Sweden)

Elena Viktorovna Kurushina

2015-12-01

Full Text Available Modern trends are associated with the integration and globalization. Integration is an immanent property of all systems and is the result of the evolution. Integration has its positive and negative effects. The degree of the progress towards the global economy is measured by the integration level in terms of the market integration indicators and the economic convergence. The latent characteristic of the globalization as a process of a unified system creation is the synchronization assuming the coincidence of the economic development ascending and descending trends in time. The coincidence of the tempo-rhythms is studied on the basis of coefficients of the pair correlation of relative growth rates of GDP for 1995-2010 in 175 countries. The very high degree of synchronization of economic dynamics is revealed in the European Union countries and in the United States. The low level of the tempo-rhythm synchronization is registered on the territory of the CIS countries. Russia occupies 29th position in the world ranking. The study of the dependence of the economic instability in the world during the crisis of 2008-2009 on the level of the tempo-rhythm coincidence shows that the more synchronized economic dynamics is, the greater excess coefficient of the average dynamics is observed during the crisis period. In 2009 it manifested itself in a greater reduction of the GDP growth rates in the European countries relatively the average wave dynamics in the pre-crisis period. The obtained results are of interest from the perspective of the substantiation of the regional economic group creation and in the context of the measures on increasing the economic stability.

Investigation of a Unified Chaotic System and Its Synchronization by Simulations

International Nuclear Information System (INIS)

Qing-Chu, Wu; Xin-Chu, Fu; Small, Michael

2010-01-01

We investigate a unified chaotic system and its synchronization including feedback synchronization and adaptive synchronization by numerical simulations. We propose a new dynamical quantity denoted by K, which connects adaptive synchronization and feedback synchronization, to analyze synchronization schemes. We find that K can estimate the smallest coupling strength for a unified chaotic system whether it is complete feedback or one-sided feedback. Based on the previous work, we also give a new dynamical method to compute the leading Lyapunov exponent. (general)

Synchronous motor with soft start element formed between the motor rotor and motor output shaft to successfully synchronize loads that have high inertia and/or high torque

Science.gov (United States)

Umans, Stephen D; Nisley, Donald L; Melfi, Michael J

2014-10-28

A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.

Synchronized control of spiral CT scan for security inspection device

International Nuclear Information System (INIS)

Wang Jue; Jiang Zenghui; Wang Fuquan

2008-01-01

In security inspection system of spiral CT, the synchronization between removing and rotating, and the scan synchronization between rotating and sampling influence quality of image reconstruction, so it is difficulty and important that how to realize synchronized scan. According to the controlling demand of multi-slice Spiral CT, the method to realize synchronized scan is given. a synchronized control system is designed, in which we use a industrial PC as the control computer, use magnetic grids as position detectors, use alternating current servo motor and roller motor as drivers respectively drive moving axis and rotating axis. This method can solve the problem of synchronized scan, and has a feasibility and value of use. (authors)

Fuzzy stability and synchronization of hyperchaos systems

International Nuclear Information System (INIS)

Wang Junwei; Xiong Xiaohua; Zhao Meichun; Zhang Yanbin

2008-01-01

This paper studies stability and synchronization of hyperchaos systems via a fuzzy-model-based control design methodology. First, we utilize a Takagi-Sugeno fuzzy model to represent a hyperchaos system. Second, we design fuzzy-model-based controllers for stability and synchronization of the system, based on so-called 'parallel distributed compensation (PDC)'. Third, we reduce a question of stabilizing and synchronizing hyperchaos systems to linear matrix inequalities (LMI) so that convex programming techniques can solve these LMIs efficiently. Finally, the generalized Lorenz hyperchaos system is employed to illustrate the effectiveness of our designing controller

Diagnóstico pré-natal das genodermatoses Prenatal diagnosis of genodermatoses

Directory of Open Access Journals (Sweden)

Maria Carolina de Abreu Sampaio

2007-08-01

Full Text Available O diagnóstico pré-natal está indicado para algumas genodermatoses graves, como a epidermólise bolhosa distrófica recessiva e a epidermólise bolhosa juncional. A biópsia de pele fetal foi introduzida em 1980, mas não pode ser realizada antes da 15a semana de gestação. A análise do DNA fetal é método preciso e pode ser realizado mais precocemente na gestação. No entanto, deve-se conhecer a base molecular da genodermatose, e é essencial determinar a mutação e/ou marcadores informativos nas famílias com criança previamente afetada. O DNA fetal pode ser obtido pela biópsia da vilosidade coriônica ou amniocentese. O diagnóstico genético pré-implantação tem surgido como alternativa que dispensa a interrupção da gestação. Essa técnica, que envolve fertilização in vitro e teste genético do embrião. vem sendo realizada para genodermatoses em poucos centros de referência. A ultra-sonografia é exame não invasivo, mas tem uso limitado no diagnóstico pré-natal de genodermatoses. A ultrasonografia tridimensional geralmente estabelece o diagnóstico tardiamente na gestação, e há apenas relatos anedóticos de diagnóstico pré-natal de genodermatoses usando esse método.Prenatal diagnostic testing is indicated for some severe genodermatoses, such as recessive dystrophic epidermolysis bullosa and junctional epidermolysis bullosa. Fetal skin biopsy was introduced in 1980, but it cannot be performed before 15th gestational week. Fetal DNA analysis is a precise method and can be performed earlier in pregnancy. However, the molecular basis of the genodermatoses must be known and it is essential to determine the gene mutations and/or informative markers in the families with a previously affected child. Fetal DNA can be obtained by chorionic villus sampling or amniocentesis. Preimplantation genetic diagnosis is an alternative approach obviating the need for termination of pregnancy. It involves in vitro fertilization and

Synchronized RACH-less Handover Solution for LTE Heterogeneous Networks

DEFF Research Database (Denmark)

Barbera, Simone; Pedersen, Klaus I.; Rosa, Claudio

2015-01-01

reductions in the data connectivity interruption time at each handover, no need for random access in the target cell, and reduced overall handover execution time. Laboratory handover measurement results, using commercial LTE equipment, are presented and analyzed to justify the latency benefits......Some of the most recent LTE features require synchronous base stations, and time-synchronized base stations also offer opportunities for improved handover mechanisms by introducing a new synchronized RACH-less handover scheme. The synchronized RACH-less handover solution offers significant...

O(t-α)-synchronization and Mittag-Leffler synchronization for the fractional-order memristive neural networks with delays and discontinuous neuron activations.

Science.gov (United States)

Chen, Jiejie; Chen, Boshan; Zeng, Zhigang

2018-04-01

This paper investigates O(t -α )-synchronization and adaptive Mittag-Leffler synchronization for the fractional-order memristive neural networks with delays and discontinuous neuron activations. Firstly, based on the framework of Filippov solution and differential inclusion theory, using a Razumikhin-type method, some sufficient conditions ensuring the global O(t -α )-synchronization of considered networks are established via a linear-type discontinuous control. Next, a new fractional differential inequality is established and two new discontinuous adaptive controller is designed to achieve Mittag-Leffler synchronization between the drive system and the response systems using this inequality. Finally, two numerical simulations are given to show the effectiveness of the theoretical results. Our approach and theoretical results have a leading significance in the design of synchronized fractional-order memristive neural networks circuits involving discontinuous activations and time-varying delays. Copyright © 2018 Elsevier Ltd. All rights reserved.

Synchronization resources in heterogeneous environments: Time-sharing, real-time and Java

International Nuclear Information System (INIS)

Pereira, A.; Vega, J.; Pacios, L.; Sanchez, E.; Portas, A.

2006-01-01

The asynchronous event distribution system (AEDS) was built to provide synchronization resources within the TJ-II local area network. It is a software system developed to add 'soft synchronization' capabilities to the TJ-II data acquisition, control and analysis environments. 'Soft synchronization' signifies that AEDS is not a real-time system. In fact, AEDS is based on TCP/IP over ETHERNET networks. However, its response time is adequate for practical purposes when synchronization requirements can support some delay between event dispatch and message reception. Event broadcasters (or synchronization servers in AEDS terminology) are Windows computers. Destination computers (or synchronization clients) were also Windows machines in the first version of AEDS. However, this fact imposed a very important limitation on synchronization capabilities. To overcome this situation, synchronization clients for different environments have been added to AEDS: for time-sharing operating systems (Unix and Linux), real-time operating systems (OS-9 and VxWorks) and Java applications. These environments have different synchronization primitives, requiring different approaches to provide the required uniform functionality. This has been achieved with POSIX thread library synchronization primitives (mutex and condition variables) on Unix/Linux systems, IPC mechanisms for concurrent processes on OS-9 and VxWorks real-time operating systems, and 'synchronized-wait/notify' primitives on Java virtual machines

Blending Online Asynchronous and Synchronous Learning

Directory of Open Access Journals (Sweden)

Lisa C. Yamagata-Lynch

2014-04-01

Full Text Available In this article I will share a qualitative self-study about a 15-week blended 100% online graduate level course facilitated through synchronous meetings on Blackboard Collaborate and asynchronous discussions on Blackboard. I taught the course at the University of Tennessee (UT during the spring 2012 semester and the course topic was online learning environments. The primary research question of this study was: How can the designer/instructor optimize learning experiences for students who are studying about online learning environments in a blended online course relying on both synchronous and asynchronous technologies? I relied on student reflections of course activities during the beginning, middle, and the end of the semester as the primary data source to obtain their insights regarding course experiences. Through the experiences involved in designing and teaching the course and engaging in this study I found that there is room in the instructional technology research community to address strategies for facilitating online synchronous learning that complement asynchronous learning. Synchronous online whole class meetings and well-structured small group meetings can help students feel a stronger sense of connection to their peers and instructor and stay engaged with course activities. In order to provide meaningful learning spaces in synchronous learning environments, the instructor/designer needs to balance the tension between embracing the flexibility that the online space affords to users and designing deliberate structures that will help them take advantage of the flexible space.

Synchronization of Coupled FitzHugh-Nagumo Neurons Using Self-Feedback Time Delay

Science.gov (United States)

Fan, Denggui; Song, Xinle; Liao, Fucheng

Many neurological diseases are characterized by abnormally synchronous oscillations of neuronal populations. However, how the neurons can synchronize with each other is still not fully understood, which may have potentially hampered the understanding and diagnosis for these dynamical diseases. In this paper, the self-feedback time delay (SFTD) and adaptive control theory are employed to control the onset of synchronization in the coupled FitzHugh-Nagumo (FHN) neurons. It is found that the larger SFTD can induce the complete synchronization of coupled neuronal system. Further investigation reveals that the reinforcing SFTD can significantly postpone the synchronization onsets. In addition, for the case that synchronization cannot be achieved by adjusting SFTD, the parameter estimation update laws and adaptive controller with respect to SFTD of coupled system are investigated to deduce the sufficient condition for complete synchronization. Simulations are also provided to illustrate the effectiveness of the proposed methods. In particular, we observed the fascinating dynamical synchronization transitions, such as chaotic synchronization and bursting synchronization transitions, as well as the transition from anti-synchronization to complete synchronization.

Coevolution of Synchronization and Cooperation in Costly Networked Interactions

Science.gov (United States)

Antonioni, Alberto; Cardillo, Alessio

2017-06-01

Despite the large number of studies on synchronization, the hypothesis that interactions bear a cost for involved individuals has seldom been considered. The introduction of costly interactions leads, instead, to the formulation of a dichotomous scenario in which an individual may decide to cooperate and pay the cost in order to get synchronized with the rest of the population. Alternatively, the same individual can decide to free ride, without incurring any cost, waiting for others to get synchronized to his or her state. Thus, the emergence of synchronization may be seen as the byproduct of an evolutionary game in which individuals decide their behavior according to the benefit-to-cost ratio they accrued in the past. We study the onset of cooperation and synchronization in networked populations of Kuramoto oscillators and report how topology is essential in order for cooperation to thrive. We also display how different classes of topology foster synchronization differently both at microscopic and macroscopic levels.

Diagnósticos de enfermagem relacionados à amamentação em unidade de alojamento conjunto

Directory of Open Access Journals (Sweden)

Evilene Pinto da Silva

2013-04-01

Full Text Available O estudo objetivou identificar, em uma unidade de Alojamento Conjunto, diagnósticos de enfermagem relacionados ao fenômeno da Amamentação de acordo com a taxonomia II da NANDA-I. Realizou-se um estudo descritivo-exploratório, envolvendo 83 mães e seus bebês, no período de fevereiro a abril de 2011. Os dados foram coletados por meio de um instrumento fundamentado na Teoria das Necessidades Humanas Básicas e, após tratamento estatístico, apresentados em tabelas. Nos resultados, o diagnóstico mais frequente foi Amamentação eficaz, com 65 (78,3%. Estima-se que os diagnósticos de enfermagem relacionados à Amamentação contribuirão para que os cuidados de enfermagem possam ser mais direcionados, de modo a promover uma assistência mais qualificada, humanizada e eficaz.

Diagnóstico educativo y capacitación periodontal

Directory of Open Access Journals (Sweden)

Odalys V Campaña Proenza

2002-12-01

Full Text Available Se realizó una investigación en individuos de ambos sexos, mayores de 14 años de edad y pertenecientes al área de salud que atiende la Facultad de Estomatología del ISCM-H, con el objetivo de evaluar un método de diagnóstico y capacitación en salud periodontal. La muestra fue seleccionada al azar y se dividió en 2 grupos (estudio y control. A cada uno de los individuos escogidos se les realizó una encuesta inicial para determinar conocimientos relativos a la enfermedad periodontal (diagnóstico educativo, y se determinó que eran semejantes, pues no se encontraron diferencias estadísticamente significativas entre ambas. El grupo de estudio se sometió al método educativo propuesto y los resultados de conocimientos obtenidos después de este mostraron diferencias significativas en relación con el diagnóstico educativo. Ambos grupos, que a su inicio eran semejantes, volvieron a encuestarse al año, y se observó que el grupo de estudio seguía manteniendo mejores resultados.A research was made in individuals over 14 of both sexes from the health area receiving attention at the Dental Faculty of the Higher Institute of Medical Sciences of Havana City aimed at evaluating a method of diagnosis and upgrading in periodontal health. The sample was selected at random and it was divided into 2 groups (study and control. An inititial survey was done to every selected individual to determine his knowledge of periodontal disease (diagnostic-educative and it was found that they were similar, since no statistically significant differences were observed between them. The study group was applied the proposed educative method and the results obtained showed marked differences in relation to the educative diagnosis. Both groups that were similar at the beginning were surveyed again a year later and the study group still had better results.

Traumatología máxilo facial: diagnóstico y tratamiento

Directory of Open Access Journals (Sweden)

M. Marcelo Mardones, Dr.

2011-09-01

En el presente artículo se revisan, a modo general, los principales diagnósticos de trauma máxilo facial incluyendo el traumatismo alveolo dentario, con sus respectivos manejos y tratamientos de urgencia.

Role of multistability in the transition to chaotic phase synchronization

DEFF Research Database (Denmark)

Postnov, D.E.; Vadivasova, T.E.; Sosnovtseva, Olga

1999-01-01

In this paper we describe the transition to phase synchronization for systems of coupled nonlinear oscillators that individually follow the Feigenbaum route to chaos. A nested structure of phase synchronized regions of different attractor families is observed. With this structure, the transition...... to nonsynchronous behavior is determined by the loss of stability for the most stable synchronous mode. It is shown that the appearance of hyperchaos and the transition from lag synchronization to phase synchronization are related to the merging of chaotic attractors from different families. Numerical examples...

Synchronization of a new fractional-order hyperchaotic system

International Nuclear Information System (INIS)

Wu Xiangjun; Lu Hongtao; Shen Shilei

2009-01-01

In this letter, a new fractional-order hyperchaotic system is proposed. By utilizing the fractional calculus theory and computer simulations, it is found that hyperchaos exists in the new fractional-order four-dimensional system with order less than 4. The lowest order to have hyperchaos in this system is 2.88. The results are validated by the existence of two positive Lyapunov exponents. Using the pole placement technique, a nonlinear state observer is designed to synchronize a class of nonlinear fractional-order systems. The observer method is used to synchronize two identical fractional-order hyperchaotic systems. In addition, the active control technique is applied to synchronize the new fractional-order hyperchaotic system and the fractional-order Chen hyperchaotic system. The two schemes, based on the stability theory of the fractional-order system, are rather simple, theoretically rigorous and convenient to realize synchronization. They do not require the computation of the conditional Lyapunov exponents. Numerical results are performed to verify the effectiveness of the proposed synchronization schemes.

Observer-based hyperchaos synchronization in cascaded discrete-time systems

International Nuclear Information System (INIS)

Grassi, Giuseppe

2009-01-01

This paper deals with the observer-based synchronization in a cascade connection of hyperchaotic discrete-time systems. The paper demonstrates that exact synchronization in finite time is achievable between pairs of drive-response systems using only a scalar synchronizing signal. This 'propagated synchronization' starts from the innermost drive-response system pair and propagates toward the outermost drive-system pair. Choosing the drive-system input to be an information signal (encrypted via an arbitrary encryption function) yields a potential application of this architecture in chaos-based communications.

Lag synchronization of hyperchaos with application to secure communications

International Nuclear Information System (INIS)

Li Chuandong; Liao Xiaofeng; Wong Kwokwo

2005-01-01

In this paper, hyperchaotic lag synchronization is restated as a nonlinear and lag-in-time observer design issue. This approach leads to a systematic tool, which guarantees the lag synchronization of a wide class of chaotic or hyperchaotic systems via a scalar signal. By exploiting this result, we propose a hyperchaos-based cryptosystem scheme that combines the conventional cryptographic methods and the lag synchronization of chaotic circuits. The computer simulation results show that the lag synchronization scheme and the cryptosystem proposed in this paper are both feasible

Time delay induced different synchronization patterns in repulsively coupled chaotic oscillators

Science.gov (United States)

Yao, Chenggui; Yi, Ming; Shuai, Jianwei

2013-09-01

Time delayed coupling plays a crucial role in determining the system's dynamics. We here report that the time delay induces transition from the asynchronous state to the complete synchronization (CS) state in the repulsively coupled chaotic oscillators. In particular, by changing the coupling strength or time delay, various types of synchronous patterns, including CS, antiphase CS, antiphase synchronization (ANS), and phase synchronization, can be generated. In the transition regions between different synchronous patterns, bistable synchronous oscillators can be observed. Furthermore, we show that the time-delay-induced phase flip bifurcation is of key importance for the emergence of CS. All these findings may light on our understanding of neuronal synchronization and information processing in the brain.

Generalized synchronization and coherent structures in spatially extended systems

International Nuclear Information System (INIS)

Basnarkov, Lasko; Duane, Gregory S.; Kocarev, Ljupco

2014-01-01

We study the synchronization of a coupled pair of one-dimensional Kuramoto–Sivashinsky systems, with equations augmented by a third-space-derivative term. With two different values of a system parameter, the two systems synchronize in the generalized sense. The phenomenon persists even in the extreme case when one of the equations is missing the extra term. Master–slave synchronization error is small, so the generalized synchronization relationship is useful for predicting the state of the master from that of the slave, or conversely, for controlling the slave. The spatial density of coupling points required to bring about generalized synchronization appears to be related to the wavelength of traveling wave solutions, and more generally to the width of coherent structures in the separate systems

Synchronization in node of complex networks consist of complex chaotic system

Energy Technology Data Exchange (ETDEWEB)

Wei, Qiang, E-mail: qiangweibeihua@163.com [Beihua University computer and technology College, BeiHua University, Jilin, 132021, Jilin (China); Digital Images Processing Institute of Beihua University, BeiHua University, Jilin, 132011, Jilin (China); Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, 116024 (China); Xie, Cheng-jun [Beihua University computer and technology College, BeiHua University, Jilin, 132021, Jilin (China); Digital Images Processing Institute of Beihua University, BeiHua University, Jilin, 132011, Jilin (China); Liu, Hong-jun [School of Information Engineering, Weifang Vocational College, Weifang, 261041 (China); Li, Yan-hui [The Library, Weifang Vocational College, Weifang, 261041 (China)

2014-07-15

A new synchronization method is investigated for node of complex networks consists of complex chaotic system. When complex networks realize synchronization, different component of complex state variable synchronize up to different scaling complex function by a designed complex feedback controller. This paper change synchronization scaling function from real field to complex field for synchronization in node of complex networks with complex chaotic system. Synchronization in constant delay and time-varying coupling delay complex networks are investigated, respectively. Numerical simulations are provided to show the effectiveness of the proposed method.

Chaos synchronization of coupled neurons with gap junctions

International Nuclear Information System (INIS)

Wang Qingyun; Lu Qishao; Chen Guanrong; Guo Dinghui

2006-01-01

Based on the asymptotic stability theory of dynamical systems and matrix theory, a general criterion of synchronization stability of N coupled neurons with symmetric configurations is established in this Letter. Especially, three types of connection styles (that is, chain, ring and global connections) are considered. As an illustration, complete synchronization of four coupled identical chaotic Chay neurons is investigated. The maximal conditional Lyapunov exponent is calculated and used to determine complete synchronization. As a result, complete synchronization of four coupled identical chaotic Chay neurons can be achieved when the coupling strength is above a critical value, which is dependent on the specific connection style. Numerical simulation is in good agreement with the theoretical analysis

A clock synchronization skeleton based on RTAI

NARCIS (Netherlands)

Huang, Y.; Visser, P.M.; Broenink, Johannes F.

2006-01-01

This paper presents a clock synchronization skeleton based on RTAI (Real Time Application Interface). The skeleton is a thin layer that provides unified but extendible interfaces to the underlying operating system, the synchronization algorithms and the upper level applications in need of clock

Aggression and 5HTT polymorphism in females: study of synchronized swimming and control groups.

Science.gov (United States)

Sysoeva, Olga V; Maluchenko, Natalia V; Timofeeva, Marina A; Portnova, Galina V; Kulikova, Maria A; Tonevitsky, Alexandr G; Ivanitsky, Alexey M

2009-05-01

Aggression is a heterogeneous heritable psychological trait, also influenced by environmental factors. Previous studies, mostly conducted on male population, have found some associations of the aggression with the polymorphisms of genes, regulating the activity of serotonin (5-HT) in the brain. However, psychological as well as biochemical manifestations of the aggression are different in males and females. Our study aimed to investigate the association of 5-HTT gene polymorphism with different facets of aggression (BDHI) in females. Two groups: the synchronized swimming and non-athlete control, - were examined to study the possible modulation effect of sport on the association between 5-HTT gene polymorphism and aggression. It was found that in both groups the low-active 5-HTT polymorphism (SS) was associated with increased scores on Indirect Hostility scale and decreased scores on Negativism scale, compared to LL genotype. No interaction effect between sport and 5-HTT polymorphism was found. The higher percentage of LL-carriers and lower of LS-carriers in the synchronized swimming group compared to the control one was observed. This may be the sign of the importance of LL polymorphism of 5-HTT gene, previously associated with higher resistance to stress factors, for being an athlete, although this result has to be taken cautiously keeping in mind the stratification problem. Synchronized swimmers had lower scores on Assault, Negativism, Irritability and Verbal Hostility compared to age-matched control girls (in general and for each 5-HTT genotype separately), suggesting that they may have more matured emotional system (older control group has also lower scores on these scales).

Chaos synchronization of nonlinear Bloch equations

International Nuclear Information System (INIS)

Park, Ju H.

2006-01-01

In this paper, the problem of chaos synchronization of Bloch equations is considered. A novel nonlinear controller is designed based on the Lyapunov stability theory. The proposed controller ensures that the states of the controlled chaotic slave system asymptotically synchronizes the states of the master system. A numerical example is given to illuminate the design procedure and advantage of the result derived

A proportional integral estimator-based clock synchronization protocol for wireless sensor networks.

Science.gov (United States)

Yang, Wenlun; Fu, Minyue

2017-11-01

Clock synchronization is an issue of vital importance in applications of WSNs. This paper proposes a proportional integral estimator-based protocol (EBP) to achieve clock synchronization for wireless sensor networks. As each local clock skew gradually drifts, synchronization accuracy will decline over time. Compared with existing consensus-based approaches, the proposed synchronization protocol improves synchronization accuracy under time-varying clock skews. Moreover, by restricting synchronization error of clock skew into a relative small quantity, it could reduce periodic re-synchronization frequencies. At last, a pseudo-synchronous implementation for skew compensation is introduced as synchronous protocol is unrealistic in practice. Numerical simulations are shown to illustrate the performance of the proposed protocol. Copyright © 2017 ISA. Published by Elsevier Ltd. All rights reserved.

Time-varying multiplex network: Intralayer and interlayer synchronization

Science.gov (United States)

Rakshit, Sarbendu; Majhi, Soumen; Bera, Bidesh K.; Sinha, Sudeshna; Ghosh, Dibakar

2017-12-01

A large class of engineered and natural systems, ranging from transportation networks to neuronal networks, are best represented by multiplex network architectures, namely a network composed of two or more different layers where the mutual interaction in each layer may differ from other layers. Here we consider a multiplex network where the intralayer coupling interactions are switched stochastically with a characteristic frequency. We explore the intralayer and interlayer synchronization of such a time-varying multiplex network. We find that the analytically derived necessary condition for intralayer and interlayer synchronization, obtained by the master stability function approach, is in excellent agreement with our numerical results. Interestingly, we clearly find that the higher frequency of switching links in the layers enhances both intralayer and interlayer synchrony, yielding larger windows of synchronization. Further, we quantify the resilience of synchronous states against random perturbations, using a global stability measure based on the concept of basin stability, and this reveals that intralayer coupling strength is most crucial for determining both intralayer and interlayer synchrony. Lastly, we investigate the robustness of interlayer synchronization against a progressive demultiplexing of the multiplex structure, and we find that for rapid switching of intralayer links, the interlayer synchronization persists even when a large number of interlayer nodes are disconnected.

Synchronization of networks

Indian Academy of Sciences (India)

We study the synchronization of coupled dynamical systems on networks. The dynamics is .... Such a time-varying topology can occur in social networks, computer networks, WWW ... This has the effect of reducing the spread of the transverse ...

Synchronization resources in heterogeneous environments: Time-sharing, real-time and Java

Energy Technology Data Exchange (ETDEWEB)

Pereira, A. [Asociacion EURATOM/CIEMAT para Fusion, CIEMAT Edificio 66, Avda. Complutense, 22, 28040 Madrid (Spain)]. E-mail: augusto.pereira@ciemat.es; Vega, J. [Asociacion EURATOM/CIEMAT para Fusion, CIEMAT Edificio 66, Avda. Complutense, 22, 28040 Madrid (Spain); Pacios, L. [Asociacion EURATOM/CIEMAT para Fusion, CIEMAT Edificio 66, Avda. Complutense, 22, 28040 Madrid (Spain); Sanchez, E. [Asociacion EURATOM/CIEMAT para Fusion, CIEMAT Edificio 66, Avda. Complutense, 22, 28040 Madrid (Spain); Portas, A. [Asociacion EURATOM/CIEMAT para Fusion, CIEMAT Edificio 66, Avda. Complutense, 22, 28040 Madrid (Spain)

2006-07-15

The asynchronous event distribution system (AEDS) was built to provide synchronization resources within the TJ-II local area network. It is a software system developed to add 'soft synchronization' capabilities to the TJ-II data acquisition, control and analysis environments. 'Soft synchronization' signifies that AEDS is not a real-time system. In fact, AEDS is based on TCP/IP over ETHERNET networks. However, its response time is adequate for practical purposes when synchronization requirements can support some delay between event dispatch and message reception. Event broadcasters (or synchronization servers in AEDS terminology) are Windows computers. Destination computers (or synchronization clients) were also Windows machines in the first version of AEDS. However, this fact imposed a very important limitation on synchronization capabilities. To overcome this situation, synchronization clients for different environments have been added to AEDS: for time-sharing operating systems (Unix and Linux), real-time operating systems (OS-9 and VxWorks) and Java applications. These environments have different synchronization primitives, requiring different approaches to provide the required uniform functionality. This has been achieved with POSIX thread library synchronization primitives (mutex and condition variables) on Unix/Linux systems, IPC mechanisms for concurrent processes on OS-9 and VxWorks real-time operating systems, and 'synchronized-wait/notify' primitives on Java virtual machines.

Diagnóstico del abdomen agudo en el consultorio del Médico de Familia

Directory of Open Access Journals (Sweden)

Caridad Soler Morejón1

2001-08-01

Full Text Available El diagnóstico de afecciones abdominales agudas es a menudo complejo y difícil para el médico práctico, pero más aún si contamos con los recursos diagnósticos limitados de un consultorio médico en el nivel de atención primaria. Es por ello que resulta de utilidad poder disponer de métodos simples y eficaces que permitan mejorar la certeza del diagnóstico y que puedan ser implementados con facilidad en este medio. Tal es el caso de la medición transuretral de la presión intraabdominal.Summary The diagnosis of acute abdominal affections is complex and difficult for practitioners, but it is even more complicated when the diagnostic tools are limited, as it is the case of the family physician’s office at the primary health care level. That’s why, it is useful to have simple and effective methods that allow to improve the accuracy of diagnosis and that may be applied in this setting. That’s what happens with the transurethral measurement of intraabdominal pressure

Powder metallurgy ferrous synchronizer ring with brass-based friction layer; Tetsu-do niso shoketsu synchronize ring no kaihatsu

Energy Technology Data Exchange (ETDEWEB)

Okajima, H; Yoshikawa, K; Miyajima, K; Sugiyama, M [Toyota Motor Corp., Aichi (Japan); Nakamura, M; Ito, M [Japan Powder Metallurgy Co. Ltd., Tokyo (Japan)

1997-10-01

Synchronizer rings for manual transmissions are generally made of brass or molybdenum coated brass. Powder metallurgy (PM) synchronizer ring was developed for the purpose of high performance and cost reduction. This synchronizer ring consists of the high strength PM ferrous ring that needs neither special densification nor heat treatment, and it has the brass-based friction layer. New joining technique was required because of that shape and two different materials. Powder of copper-phosphorus alloy are admixed with the friction material. While sintering, that melt and migrate to the interface. Then the friction layer and the ferrous ring are joined tightly. 7 refs., 9 figs., 6 tabs.

Diagnósticos de enfermagem do paciente no período pós-operatório imediato Nursing diagnoses of the patient in the immediate post-operative period

Directory of Open Access Journals (Sweden)

Lídia Aparecida Rossi

2000-06-01

Full Text Available O objetivo deste estudo foi identificar os diagnósticos de enfermagem mais freqüentes de pacientes em pós-operatório imediato. Foi elaborada uma ficha de avaliação pós-anestésica do período pós-operatório que foi utilizada em 28 pacientes nas primeiras duas horas em que permaneceram em centro de recuperação pós-anestésica. Os diagnósticos de enfermagem foram estabelecidos com base na Taxionomia I dos Diagnósticos de Enfermagem da North American Nursing Diagnosis Association -NANDA. Foram identificados os seguintes diagnósticos: risco para injúria (100,0%, risco para infecção (92,8%, senso-percepção alterada (89,2%, risco para aspiração (82,1%, mobilidade física prejudicada (71,4%, integridade tissular prejudicada (82,1% e hipotermia (67,8%.The aim of this study was to identify the nursing diagnoses that are more f requent in patients in immediate post-operative period. Data were collected and recorded on specially cards, through evaluation of 28 patients in the f irst two hours af ter the admission of the patient. The nursing diagnoses were set by one of the authors, based on Taxonomy I, proposed by North American Nursing Diagnosis Association - NANDA. The diagnoses that occurred mostly were: Risk for injury (100,0%, Risk for inf ection (92,8% , Sensory perceptual al terations (89,2% , Risk for aspiration (82,1% , Impaired physical mobility (71,4%, Impaired tissue integrity (82,1% and Hypothermia (67,8%.

Function projective lag synchronization of fractional-order chaotic systems

International Nuclear Information System (INIS)

Wang Sha; Yu Yong-Guang; Wang Hu; Rahmani Ahmed

2014-01-01

Function projective lag synchronization of different structural fractional-order chaotic systems is investigated. It is shown that the slave system can be synchronized with the past states of the driver up to a scaling function matrix. According to the stability theorem of linear fractional-order systems, a nonlinear fractional-order controller is designed for the synchronization of systems with the same and different dimensions. Especially, for two different dimensional systems, the synchronization is achieved in both reduced and increased dimensions. Three kinds of numerical examples are presented to illustrate the effectiveness of the scheme. (general)

The role of attention and intention in synchronization to music: effects on gait.

Science.gov (United States)

Leow, Li-Ann; Waclawik, Kristina; Grahn, Jessica A

2018-01-01

Anecdotal accounts suggest that individuals spontaneously synchronize their movements to the 'beat' of background music, often without intending to, and perhaps even without attending to the music at all. However, the question of whether intention and attention are necessary to synchronize to the beat remains unclear. Here, we compared whether footsteps during overground walking were synchronized to the beat when young healthy adults were explicitly instructed to synchronize (intention to synchronize), and were not instructed to synchronize (no intention) (Experiment 1: intention). We also examined whether reducing participants' attention to the music affected synchronization, again when participants were explicitly instructed to synchronize, and when they were not (Experiment 2: attention/intention). Synchronization was much less frequent when no instructions to synchronize were given. Without explicit instructions to synchronize, there was no evidence of synchronization in 60% of the trials in Experiment 1, and 43% of the trials in Experiment 2. When instructed to synchronize, only 26% of trials in Experiment 1, and 14% of trials in Experiment 2 showed no evidence of synchronization. Because walking to music alters gait, we also examined how gait kinematics changed with or without instructions to synchronize, and attention to the music was required for synchronization to occur. Instructions to synchronize elicited slower, shorter, and more variable strides than walking in silence. Reducing attention to the music did not significantly affect synchronization of footsteps to the beat, but did elicit slower gait. Thus, during walking, intention, but not attention, appears to be necessary to synchronize footsteps to the beat, and synchronization elicits slower, shorter, and more variable strides, at least in young healthy adults.

Chaos synchronization of a unified chaotic system via partial linearization

International Nuclear Information System (INIS)

Yu Yongguang; Li Hanxiong; Duan Jian

2009-01-01

A partial linearization method is proposed for realizing the chaos synchronization of an unified chaotic system. Through synchronizing partial state of the chaotic systems can result in the synchronization of their entire states, and the resulting controller is singularity free. The results can be easily extended to the synchronization of other similar chaotic systems. Simulation results are conducted to show the effectiveness of the method.

Electrical implementation of a complete synchronization dynamic system

International Nuclear Information System (INIS)

Goncalves, C; Neto, L G

2011-01-01

This work presents an electrical implementation of complete synchronization systems, proposing a master/slave synchronization of two identical particle-in-a-box electronic circuits, exhibiting a rich chaotic behaviour. This behaviour was measured, and also emulated, and the results were compared. Just a few works in literature describe experimental measurements of chaotic systems. The master/slave electronic circuits employed have a very simple electronic implementation and results show a complete synchronization of the system.

Micelle-stabilized room-temperature phosphorescence with synchronous scanning

International Nuclear Information System (INIS)

Femia, R.A.; Love, L.J.C.

1984-01-01

The experimental requirements for synchronous wavelength scanning micelle-stabilized room temperature phosphorescence and the factors affecting peak resolution are presented and compared with those for synchronous wavelength scanning fluorescence. Identification of individual compounds in a four-component mixture is illustrated, and criteria to identify and minimize triplet state energy transfer are given. Considerable improvement in resolution of the synchronous peaks is obtained via second derivative spectra. 20 references, 7 figures, 2 tables

Review of available synchronization and time distribution techniques

Science.gov (United States)

Hall, R. G.; Lieberman, T. N.; Stone, R. R.

1974-01-01

The methods of synchronizing precision clocks will be reviewed placing particular attention to the simpler techniques, their accuracies, and the approximate cost of equipment. The more exotic methods of synchronization are discussed in lesser detail. The synchronization techniques that will be covered will include satellite dissemination, communication and navigation transmissions via VLF, LF, HF, UHF and microwave as well as commercial and armed forces television. Portable clock trips will also be discussed.

Contributions to time-frequency synchronization in wireless systems

OpenAIRE

Koivisto, Tommi

2015-01-01

Time and frequency synchronization is an indispensable task for all wireless transceivers and systems. In modern wireless systems, such as 4G and future 5G systems, new wireless technologies set new challenges also to synchronization. In particular, new solutions for time and frequency synchronization are needed in multiantenna and cooperative systems. New research areas arise also in context of interference cancellation and cognitive radio systems where the transmission parameters of the sig...

Detection of Nonverbal Synchronization through Phase Difference in Human Communication.

Science.gov (United States)

Kwon, Jinhwan; Ogawa, Ken-ichiro; Ono, Eisuke; Miyake, Yoshihiro

2015-01-01

Nonverbal communication is an important factor in human communication, and body movement synchronization in particular is an important part of nonverbal communication. Some researchers have analyzed body movement synchronization by focusing on changes in the amplitude of body movements. However, the definition of "body movement synchronization" is still unclear. From a theoretical viewpoint, phase difference is the most important factor in synchronization analysis. Therefore, there is a need to measure the synchronization of body movements using phase difference. The purpose of this study was to provide a quantitative definition of the phase difference distribution for detecting body movement synchronization in human communication. The phase difference distribution was characterized using four statistical measurements: density, mean phase difference, standard deviation (SD) and kurtosis. To confirm the effectiveness of our definition, we applied it to human communication in which the roles of speaker and listener were defined. Specifically, we examined the difference in the phase difference distribution between two different communication situations: face-to-face communication with visual interaction and remote communication with unidirectional visual perception. Participant pairs performed a task supposing lecture in the face-to-face communication condition and in the remote communication condition via television. Throughout the lecture task, we extracted a set of phase differences from the time-series data of the acceleration norm of head nodding motions between two participants. Statistical analyses of the phase difference distribution revealed the characteristics of head nodding synchronization. Although the mean phase differences in synchronized head nods did not differ significantly between the conditions, there were significant differences in the densities, the SDs and the kurtoses of the phase difference distributions of synchronized head nods. These

Detection of Nonverbal Synchronization through Phase Difference in Human Communication.

Directory of Open Access Journals (Sweden)

Jinhwan Kwon

Full Text Available Nonverbal communication is an important factor in human communication, and body movement synchronization in particular is an important part of nonverbal communication. Some researchers have analyzed body movement synchronization by focusing on changes in the amplitude of body movements. However, the definition of "body movement synchronization" is still unclear. From a theoretical viewpoint, phase difference is the most important factor in synchronization analysis. Therefore, there is a need to measure the synchronization of body movements using phase difference. The purpose of this study was to provide a quantitative definition of the phase difference distribution for detecting body movement synchronization in human communication. The phase difference distribution was characterized using four statistical measurements: density, mean phase difference, standard deviation (SD and kurtosis. To confirm the effectiveness of our definition, we applied it to human communication in which the roles of speaker and listener were defined. Specifically, we examined the difference in the phase difference distribution between two different communication situations: face-to-face communication with visual interaction and remote communication with unidirectional visual perception. Participant pairs performed a task supposing lecture in the face-to-face communication condition and in the remote communication condition via television. Throughout the lecture task, we extracted a set of phase differences from the time-series data of the acceleration norm of head nodding motions between two participants. Statistical analyses of the phase difference distribution revealed the characteristics of head nodding synchronization. Although the mean phase differences in synchronized head nods did not differ significantly between the conditions, there were significant differences in the densities, the SDs and the kurtoses of the phase difference distributions of synchronized head

Synchronized Data Aggregation for Wireless Sensor Network

DEFF Research Database (Denmark)

Dnyaneshwar, Mantri; Prasad, Neeli R.; Prasad, Ramjee

2014-01-01

Wireless Sensor Networks (WSNs) are used for monitoring and data collection purposes. A key challenge in effective data collection is to schedule and synchronize the activities of the nodes with global clock. This paper proposes the Synchronized Data Aggregation Algorithm (SDA) using spanning tree...

Dependence of synchronization frequency of Kuramoto oscillators ...

Indian Academy of Sciences (India)

Kuramoto oscillators have been proposed earlier as a model for interacting systems that exhibit synchronization. In this article, we study the difference between networks with symmetric and asymmetric distribution of natural frequencies. We first indicate that synchronization frequency of oscillators in a completely connected ...

The least channel capacity for chaos synchronization.

Science.gov (United States)

Wang, Mogei; Wang, Xingyuan; Liu, Zhenzhen; Zhang, Huaguang

2011-03-01

Recently researchers have found that a channel with capacity exceeding the Kolmogorov-Sinai entropy of the drive system (h(KS)) is theoretically necessary and sufficient to sustain the unidirectional synchronization to arbitrarily high precision. In this study, we use symbolic dynamics and the automaton reset sequence to distinguish the information that is required in identifying the current drive word and obtaining the synchronization. Then, we show that the least channel capacity that is sufficient to transmit the distinguished information and attain the synchronization of arbitrarily high precision is h(KS). Numerical simulations provide support for our conclusions.

Relaxation of synchronization on complex networks.

Science.gov (United States)

Son, Seung-Woo; Jeong, Hawoong; Hong, Hyunsuk

2008-07-01

We study collective synchronization in a large number of coupled oscillators on various complex networks. In particular, we focus on the relaxation dynamics of the synchronization, which is important from the viewpoint of information transfer or the dynamics of system recovery from a perturbation. We measure the relaxation time tau that is required to establish global synchronization by varying the structural properties of the networks. It is found that the relaxation time in a strong-coupling regime (K>Kc) logarithmically increases with network size N , which is attributed to the initial random phase fluctuation given by O(N-1/2) . After elimination of the initial-phase fluctuation, the relaxation time is found to be independent of the system size; this implies that the local interaction that depends on the structural connectivity is irrelevant in the relaxation dynamics of the synchronization in the strong-coupling regime. The relaxation dynamics is analytically derived in a form independent of the system size, and it exhibits good consistency with numerical simulations. As an application, we also explore the recovery dynamics of the oscillators when perturbations enter the system.

Chaotic synchronization of two complex nonlinear oscillators

International Nuclear Information System (INIS)

Mahmoud, Gamal M.; Mahmoud, Emad E.; Farghaly, Ahmed A.; Aly, Shaban A.

2009-01-01

Synchronization is an important phenomenon commonly observed in nature. It is also often artificially induced because it is desirable for a variety of applications in physics, applied sciences and engineering. In a recent paper [Mahmoud GM, Mohamed AA, Aly SA. Strange attractors and chaos control in periodically forced complex Duffing's oscillators. Physica A 2001;292:193-206], a system of periodically forced complex Duffing's oscillators was introduced and shown to display chaotic behavior and possess strange attractors. Such complex oscillators appear in many problems of physics and engineering, as, for example, nonlinear optics, deep-water wave theory, plasma physics and bimolecular dynamics. Their connection to solutions of the nonlinear Schroedinger equation has also been pointed out. In this paper, we study the remarkable phenomenon of chaotic synchronization on these oscillator systems, using active control and global synchronization techniques. We derive analytical expressions for control functions and show that the dynamics of error evolution is globally stable, by constructing appropriate Lyapunov functions. This means that, for a relatively large set initial conditions, the differences between the drive and response systems vanish exponentially and synchronization is achieved. Numerical results are obtained to test the validity of the analytical expressions and illustrate the efficiency of these techniques for inducing chaos synchronization in our nonlinear oscillators.

Synchronization ability of coupled cell-cycle oscillators in changing environments

Science.gov (United States)

2012-01-01

Background The biochemical oscillator that controls periodic events during the Xenopus embryonic cell cycle is centered on the activity of CDKs, and the cell cycle is driven by a protein circuit that is centered on the cyclin-dependent protein kinase CDK1 and the anaphase-promoting complex (APC). Many studies have been conducted to confirm that the interactions in the cell cycle can produce oscillations and predict behaviors such as synchronization, but much less is known about how the various elaborations and collective behavior of the basic oscillators can affect the robustness of the system. Therefore, in this study, we investigate and model a multi-cell system of the Xenopus embryonic cell cycle oscillators that are coupled through a common complex protein, and then analyze their synchronization ability under four different external stimuli, including a constant input signal, a square-wave periodic signal, a sinusoidal signal and a noise signal. Results Through bifurcation analysis and numerical simulations, we obtain synchronization intervals of the sensitive parameters in the individual oscillator and the coupling parameters in the coupled oscillators. Then, we analyze the effects of these parameters on the synchronization period and amplitude, and find interesting phenomena, e.g., there are two synchronization intervals with activation coefficient in the Hill function of the activated CDK1 that activates the Plk1, and different synchronization intervals have distinct influences on the synchronization period and amplitude. To quantify the speediness and robustness of the synchronization, we use two quantities, the synchronization time and the robustness index, to evaluate the synchronization ability. More interestingly, we find that the coupled system has an optimal signal strength that maximizes the synchronization index under different external stimuli. Simulation results also show that the ability and robustness of the synchronization for the square

Hybrid synchronization of two independent chaotic systems on ...

Indian Academy of Sciences (India)

Keywords. Hybrid synchronization; complex network; information source; chaotic system. ... encryption and decryption through synchronization. However, the ... Certainly, if the two systems are different, the security would be improved. How.

Linear Matrix Inequality Based Fuzzy Synchronization for Fractional Order Chaos

Directory of Open Access Journals (Sweden)

Bin Wang

2015-01-01

Full Text Available This paper investigates fuzzy synchronization for fractional order chaos via linear matrix inequality. Based on generalized Takagi-Sugeno fuzzy model, one efficient stability condition for fractional order chaos synchronization or antisynchronization is given. The fractional order stability condition is transformed into a set of linear matrix inequalities and the rigorous proof details are presented. Furthermore, through fractional order linear time-invariant (LTI interval theory, the approach is developed for fractional order chaos synchronization regardless of the system with uncertain parameters. Three typical examples, including synchronization between an integer order three-dimensional (3D chaos and a fractional order 3D chaos, anti-synchronization of two fractional order hyperchaos, and the synchronization between an integer order 3D chaos and a fractional order 4D chaos, are employed to verify the theoretical results.

Simulating synchronization in neuronal networks

Science.gov (United States)

Fink, Christian G.

2016-06-01

We discuss several techniques used in simulating neuronal networks by exploring how a network's connectivity structure affects its propensity for synchronous spiking. Network connectivity is generated using the Watts-Strogatz small-world algorithm, and two key measures of network structure are described. These measures quantify structural characteristics that influence collective neuronal spiking, which is simulated using the leaky integrate-and-fire model. Simulations show that adding a small number of random connections to an otherwise lattice-like connectivity structure leads to a dramatic increase in neuronal synchronization.

Mutual information as an order parameter for quantum synchronization

Science.gov (United States)

Ameri, V.; Eghbali-Arani, M.; Mari, A.; Farace, A.; Kheirandish, F.; Giovannetti, V.; Fazio, R.

2015-01-01

Spontaneous synchronization is a fundamental phenomenon, important in many theoretical studies and applications. Recently, this effect has been analyzed and observed in a number of physical systems close to the quantum-mechanical regime. In this work we propose mutual information as a useful order parameter which can capture the emergence of synchronization in very different contexts, ranging from semiclassical to intrinsically quantum-mechanical systems. Specifically, we first study the synchronization of two coupled Van der Pol oscillators in both classical and quantum regimes and later we consider the synchronization of two qubits inside two coupled optical cavities. In all these contexts, we find that mutual information can be used as an appropriate figure of merit for determining the synchronization phases independently of the specific details of the system.

Diagnóstico e tratamento das Bronquiectasias: uma atualização

Directory of Open Access Journals (Sweden)

Paulo de Tarso Roth Dalcin

2007-07-01

Full Text Available O termo bronquiectasia refere-se à dilatação anormal e irreversível dos brônquios. Atualmente, nos países desenvolvidos, onde a maior parte das bronquiectasias é atribuída a doenças sistêmicas, como a fibrose cística e as imunodeficiências primárias, têm-se observado uma diminuição progressiva da incidência dessa doença. Entretanto, em países em desenvolvimento, com menores recursos de saúde, as bronquiectasias pós-infecciosas continuam sendo um importante e freqüente problema de saúde pública. A tomografia computadorizada de alta resolução melhorou a eficácia diagnóstica nas bronquiectasias permitindo o diagnóstico mais precoce dessa entidade. A base do tratamento das bronquiectasias inclui tratar a causa específica quando possível, administrar antibióticos para tratamento da exacerbação e para supressão da carga microbiana, reduzir a excessiva resposta inflamatória, promover a higiene brônquica, controlar a hemorragia brônquica e remover cirurgicamente segmentos ou lobos extremamente danificados que possam se constituir em focos de infecção ou sangramento. Esta revisão aborda aspectos relevantes da patogênese, etiologia e diagnóstico das bronquiectasias e realiza uma atualização da terapêutica disponível.

Special Section on Synchronization in Nonlinear Science and Engineering

Science.gov (United States)

Ikeguchi, Tohru; Tokuda, Isao

Synchronization is a ubiquitous phenomenon of coupled nonlinear oscillators, commonly found in physics, engineering, biology, and other diverse disciplines. It has a long research history back to Christiaan Huygens, who discovered synchronized motion of two pendulum clocks in 1673. It is very easy to observe synchronization in our daily life: e.g., metronomes, candle fires, pet-bottle oscillators, saltwater oscillators, and so on(See, for example, experimental movies at http://www.youtube.com/user/IkeguchiLab?feature=watch). For the last few decades, significant development has been made from both theories and experiments on synchronization of coupled limit cycle oscillators as well as coupled chaotic oscillators. Applications have been also developed to communication technologies, controlling techniques, and data analysis. Combined with the idea from complex network theory, neuroscience, and systems biology, the research speed of synchronization has been even accelerated. This Special Section of NOLTA is primarily dedicated to the recent advanced development of basics and applications of synchronization in science and engineering. A number of qualified works is included, ranging from experimental study on synchronization of Huygens' system, analog circuits, and singing voice to applied study of synchronization in communication networks. One invited paper is devoted to comprehensive reviews on generalized synchronization of chaotic oscillators. On behalf of the editorial committee of the special section, the guest editors would like to express their sincere thanks to all the authors for their excellent contributions. In particular, they are grateful to Prof. Dr. Ulrich Parlitz for contributing his distinguished review article. They would also like to thank the reviewers and the members of the guest editorial committee, especially Prof. Hiroo Sekiya of Chiba University and the editorial staffs of the NOLTA journal, for their supports on publishing this Special

Designing synchronization schemes for chaotic fractional-order unified systems

International Nuclear Information System (INIS)

Wang Junwei; Zhang Yanbin

2006-01-01

Synchronization in chaotic fractional-order differential systems is studied both theoretically and numerically. Two schemes are designed to achieve chaos synchronization of so-called unified chaotic systems and the corresponding numerical algorithms are established. Some sufficient conditions on synchronization are also derived based on the Laplace transformation theory. Computer simulations are used for demonstration

Projective synchronization based on suitable separation

International Nuclear Information System (INIS)

Li Guohui; Xiong Chuan; Sun Xiaonan

2007-01-01

A new approach for constructing a projective-synchronized chaotic slave system is proposed in this paper. This method is based on suitable separation by decomposing the system as the linear part and the nonlinear one. From matrix measure theory, some simple but efficient criteria are derived for projective synchronization of chaotic system. Numerical simulations for the Lorenz system show that this control method works very well

A Novel Method of Clock Synchronization in Distributed Systems

Science.gov (United States)

Li, Gun; Niu, Meng-jie; Chai, Yang-shun; Chen, Xin; Ren, Yan-qiu

2017-04-01

Time synchronization plays an important role in the spacecraft formation flight and constellation autonomous navigation, etc. For the application of clock synchronization in a network system, it is not always true that all the observed nodes in the network are interconnected, therefore, it is difficult to achieve the high-precision time synchronization of a network system in the condition that a certain node can only obtain the measurement information of clock from a single neighboring node, but cannot obtain it from other nodes. Aiming at this problem, a novel method of high-precision time synchronization in a network system is proposed. In this paper, each clock is regarded as a node in the network system, and based on the definition of different topological structures of a distributed system, the three control algorithms of time synchronization under the following three cases are designed: without a master clock (reference clock), with a master clock (reference clock), and with a fixed communication delay in the network system. And the validity of the designed clock synchronization protocol is proved by both stability analysis and numerical simulation.

The impulsive control synchronization of the drive-response complex system

International Nuclear Information System (INIS)

Zhao Yanhong; Yang Yongqing

2008-01-01

This Letter investigates projective synchronization between the drive system and response complex dynamical system. An impulsive control scheme is adapted to synchronize the drive-response dynamical system to a desired scalar factor. By using the stability theory of the impulsive differential equation, the criteria for the projective synchronization are derived. The feasibility of the impulsive control of the projective synchronization is demonstrated in the drive-response dynamical system

Diagnóstico e tratamento de epilepsia e crises pseudoepilépticas psicogênicas associadas: relato de caso

Directory of Open Access Journals (Sweden)

Marchetti Renato Luiz

2001-01-01

Full Text Available Relatamos o caso de uma paciente de 26 anos em que é evidenciada a importância médica do diagnóstico diferencial entre epilepsia e crises pseudo-epilépticas psicogênicas (CPEP e do seu tratamento. A paciente, uma professora desempregada, com crises desde os 13 anos, foi encaminhada ao PROJEPSI para diagnóstico e tratamento de CPEP. Seu diagnóstico inicial foi de epilepsia parcial sintomática por lesão tumoral cística em região occipto-temporal esquerda, associada a CPEP. Submetida a craniotomia occipital com ressecção de processo expansivo em região de istmo do cíngulo, evoluiu com persistência das CPEP. Submetida a tratamento psicológico integrado envolvendo técnicas de condicionamento operante, manejo de ansiedade, sugestão e orientação familiar, houve remissão completa das CPEP após 4 meses de tratamento. O caso apresentado demonstra a necessidade de múltiplos procedimentos diagnósticos e terapêuticos e a participação de equipe multidisciplinar especializada.

Unificando los criterios de sepsis neonatal tardía: propuesta de un algoritmo de vigilancia diagnóstica

Science.gov (United States)

Zea-Vera, Alonso; Turin, Christie G.; Ochoa, Theresa J.

2015-01-01

Las infecciones constituyen una de las principales causas de muerte en el periodo neonatal. El diagnóstico de sepsis neonatal representa un gran desafío ya que los recién nacidos presentan signos clínicos muy inespecíficos y los exámenes auxiliares tienen una baja sensibilidad. Con el objetivo de mejorar el diagnóstico correcto de esta patología proponemos un algoritmo de vigilancia diagnóstica para sepsis neonatal tardía en el Perú y países de la región. El algoritmo permite clasificar a los episodios como sepsis confirmada, probable o posible, y sobretodo busca identificar aquellos episodios que no corresponden a sepsis, evitando calificar otras patologías como “sepsis”. Un mejor diagnóstico permitiría tener tasas más reales de sepsis neonatal, mejorar el uso de antibióticos y evitar sus efectos negativos en el recién nacido, así como una visión más exacta de su impacto en la salud pública. PMID:25123879

Synchronization of bursting neurons with a slowly varying d. c. current

International Nuclear Information System (INIS)

Upadhyay, Ranjit Kumar; Mondal, Argha

2017-01-01

Highlights: • To examine synchronization, noisy chemical and electrical coupling have been considered for a coupled bursting M-L neurons. • Bursting presents the precursor to spike synchronization and coupling strength increases the locking between neurons (anti phase and in phase). • The stability of synchronization is established via similarity function. • The necessary condition to occur CS state is observed using master stability function. • A network of four M-L neurons is considered to observe the synchronization. - Abstract: Bursting of neuronal firing is an interesting dynamical consequences depending on fast/slow dynamics. Certain cells in different brain regions produce spike-burst activity. We study such firing activity and its transitions to synchronization using identical as well as non-identical coupled bursting Morris-Lecar (M-L) neurons. Synchronization of different firing activity is a multi-time-scale phenomenon and burst synchronization presents the precursor to spike synchronization. Chemical synapses are one of the dynamical means of information processing between neurons. Electrical synapses play a major role for synchronous activity in a certain network of neurons. Synaptically coupled neural cells exhibit different types of synchronization such as in phase or anti-phase depending on the nature and strength of coupling functions and the synchronization regimes are analyzed by similarity functions. The sequential transitions to synchronization regime are examined by the maximum transverse Lyapunov exponents. Synchronization of voltage traces of two types of planar bursting mechanisms is explored for both kind of synapses under realistic conditions. The noisy influence effects on the transmission of signals and strongly acts to the firing activity (such as periodic firing and bursting) and integration of signals for a network. It has been examined using the mean interspike interval analysis. The transition to synchronization states of

Forced synchronization of large-scale circulation to increase predictability of surface states

Science.gov (United States)

Shen, Mao-Lin; Keenlyside, Noel; Selten, Frank; Wiegerinck, Wim; Duane, Gregory

2016-04-01

Numerical models are key tools in the projection of the future climate change. The lack of perfect initial condition and perfect knowledge of the laws of physics, as well as inherent chaotic behavior limit predictions. Conceptually, the atmospheric variables can be decomposed into a predictable component (signal) and an unpredictable component (noise). In ensemble prediction the anomaly of ensemble mean is regarded as the signal and the ensemble spread the noise. Naturally the prediction skill will be higher if the signal-to-noise ratio (SNR) is larger in the initial conditions. We run two ensemble experiments in order to explore a way to reduce the SNR of surface winds and temperature. One ensemble experiment is AGCM with prescribing sea surface temperature (SST); the other is AGCM with both prescribing SST and nudging the high-level temperature and winds to ERA-Interim. Each ensemble has 30 members. Larger SNR is expected and found over the tropical ocean in the first experiment because the tropical circulation is associated with the convection and the associated surface wind convergence as these are to a large extent driven by the SST. However, small SNR is found over high latitude ocean and land surface due to the chaotic and non-synchronized atmosphere states. In the second experiment the higher level temperature and winds are forced to be synchronized (nudged to reanalysis) and hence a larger SNR of surface winds and temperature is expected. Furthermore, different nudging coefficients are also tested in order to understand the limitation of both synchronization of large-scale circulation and the surface states. These experiments will be useful for the developing strategies to synchronize the 3-D states of atmospheric models that can be later used to build a super model.

Diagnósticos de enfermagem em pacientes no período pós-operatório de cirurgias cardíacas Diagnósticos de enfermería en pacientes en el período postoperatorio de cirugías cardíacas Nursing diagnoses in patients in the postoperative period of cardiac surgery