WorldWideScience

Sample records for public distribution system

  1. Distributed Control System in Electrical Heaters of the Public Buildings

    Directory of Open Access Journals (Sweden)

    Jianhua Ren

    2013-06-01

    Full Text Available Being with many advantages such as environmental protection, controllable, facilitate measurement etc, electric heating has been promoted actively in some places .For public buildings with huge energy consumption, electric heating intelligent controlling may be the key to achieve energy conservation. In this paper, visual distributed control system (DCS was presented in electric heating of the public buildings. In this control system, a PC was used as the host, and RS232/485 interface converter was used as serial interface of mutual conversion .Through industrial standard RS485 bus with high reliability and low cost which was the link between the host and many sets of thermostat, a one-to-many communication network was formed. The MCU of the thermostats was ATMega8 microcontroller. Meanwhile, DS18B20 integrated temperature probe was used in temperature sensor .Through the DCS test online,it met the need of each individual heating unit. Therefore, unnecessary heat waste was reduced, heating costs were saved.

  2. 67 FR 64639 - Announcement of a Public Stakeholder Meeting on Drinking Water Distribution System Impacts on...

    Science.gov (United States)

    2002-10-21

    ... AGENCY Announcement of a Public Stakeholder Meeting on Drinking Water Distribution System Impacts on... finished water quality in distribution systems. The purpose of this meeting is to provide information to... public health impacts of drinking water distribution systems. Those registered by November 8 will receive...

  3. Food policy and politics. The political economy of the Public Distribution System in India

    NARCIS (Netherlands)

    J.E. Mooij (Jos)

    1998-01-01

    textabstractAbstract This paper discusses the history and political economy of the Public Distribution System (PDS) in India. This food distribution programme, which dates from 1939, is meant to increase food security both at the national and the household level. Since its emergence, it has passed t

  4. Food and power in Bihar and Jharkhand. The Political Economy of the Functioning of the Public Distribution System

    NARCIS (Netherlands)

    J.E. Mooij (Jos)

    2003-01-01

    textabstractAbstract Public distribution of foodgrains in India is a national policy, which exists in all States. In some States, however, the public distribution system (PDS) works much better than in other States. The undivided State of Bihar (now the new Bihar and Jharkhand) is one of the States

  5. DISTRIBUTION OF LEGIONELLA PNEUMOPHILA SEROGROUPS ISOLATED FROM WATER SYSTEMS OF PUBLIC FACILITIES IN BUSAN, SOUTH KOREA.

    Science.gov (United States)

    Hwang, In-Yeong; Park, Eun-Hee; Park, Yon-Koung; Park, Sun-Hee; Sung, Gyung-Hye; Park, Hye-Young; Lee, Young-Choon

    2016-05-01

    Legionella pneumophila is the major causes of legionellosis worldwide. The distribution of L. pneumophila was investigated in water systems of public facilities in Busan, South Korea during 2007 and 2013-2014. L. pneumophila was isolated from 8.3% of 3,055 samples, of which the highest isolation rate (49%) was from ships and the lowest 4% from fountains. Serogroups of L. pneumophila isolated in 2007 were distributed among serogroups (sgs) 1-7 with the exception of sg 4, while those of isolates during 2013 and 2014 included also 11 sgs ( 1, 2, 3, 4, 5, 6, 7, 8, 12, 13, 15). L. pneumophila sg 1 was predominated among isolates from fountains (75%), hotels (60%), buildings (44%), hospitals (38%), and public baths (37%), whereas sg 3 and sg 7 was the most prevalent from ships (46%) and factories (40%), respectively. The predominated serogroup of L. pneumophila isolates from hot and cooling tower water was sg 1 (35% and 46%, respectively), while from cold water was sg 3 (29%). These results should be useful for epidemiological surveys to identify sources of outbreaks of legionellosis in Busan, South Korea.

  6. Maryland Public School Standards for Telecommunications Distribution Systems: Infrastructure Design for Voice, Video, and Data Communications.

    Science.gov (United States)

    Maryland State Dept. of Education, Baltimore. School Facilities Branch.

    Telecommunications infrastructure has the dual challenges of maintaining quality while accommodating change, issues that have long been met through a series of implementation standards. This document is designed to ensure that telecommunications systems within the Maryland public school system are also capable of meeting both challenges and…

  7. INTEGRATED MANAGEMENT SYSTEMS IN LOCAL PUBLIC ENTERPRIZE FOR PRODUCTION, DISTRIBUTION AND CLEANING OF WASTED WATER

    Directory of Open Access Journals (Sweden)

    Slavko Arsovski

    2007-06-01

    Full Text Available Appearance of large number of management systems, with different and sometimes divergent demands, needs reconsideration of their implementation strategies and their integration in one integrated management system (IMS. So defined IMS would be designed and implemented in different areas. In this paper is presented basic concept of integration of partical management systems in areas of quality (ISO 9001, environmental protection (ISO 14001, occupational health (ISO 18001, food safety (ISO 22000 and accreditation of laboratories (ISO17025/ISO17020. As a pilot organization is choosed local public enterprise for production, supply and drain of water.

  8. Intelligent Distributed Systems

    Science.gov (United States)

    2015-10-23

    AFRL-AFOSR-VA-TR-2016-0006 Intelligent Distributed Systems A Stephen Morse YALE UNIV NEW HAVEN CT Final Report 10/23/2015 DISTRIBUTION A...and D. Fullmer. A distributed algorithm for efficiently solving linear equations and its applications. System and Control Letters, 2015. submitted... Distribution approved for public release. AF Office Of Scientific Research (AFOSR)/ RTA2 Arlington, Virginia 22203 Air Force Research Laboratory Air Force

  9. Public health and pipe breaks in water distribution systems: analysis with internet search volume as a proxy.

    Science.gov (United States)

    Shortridge, Julie E; Guikema, Seth D

    2014-04-15

    Drinking water distribution infrastructure has been identified as a factor in waterborne disease outbreaks and improved understanding of the public health risks associated with distribution system failures has been identified as a priority area for research. Pipe breaks may pose a risk, as their occurrence and repair can result in low or negative pressure, potentially allowing contamination of drinking water from adjacent soils. However, measuring this phenomenon is challenging because the most likely health impact is mild gastrointestinal (GI) illness, which is unlikely to result in a doctor or hospital visit. Here we present a novel method that uses data mining techniques and internet search volume to assess the relationship between pipe breaks and symptoms of GI illness in two U.S. cities. Weekly search volume for the terms diarrhea and vomiting was used as the response variable with the number of pipe breaks in each city as a covariate as well as additional covariates to control for seasonal patterns, search volume persistence, and other sources of GI illness. The fit and predictive accuracy of multiple regression and data mining techniques were compared, with the best performance obtained using random forest and bagged regression tree models. Pipe breaks were found to be an important and positively correlated predictor of internet search volume in multiple models in both cities, supporting previous investigations that indicated an increased risk of GI illness from distribution system disturbances. Copyright © 2014 Elsevier Ltd. All rights reserved.

  10. "Aca 2.0 Q&A": usage scenarios and incentive systems for a distributed academic publication model

    NARCIS (Netherlands)

    Poss, R.; Altmeyer, S.; Thompson, M.; Jelier, R.

    2014-01-01

    "Academia 2.0" is a proposal to organize scientific publishing around true peer-to-peer distributed dissemination channels and eliminate the traditional role of the academic publisher. This model will be first presented at the 2014 workshop on Reproducible Research Methodologies and New Publication

  11. Distributed data processing for public health surveillance

    Directory of Open Access Journals (Sweden)

    Yih Katherine

    2006-09-01

    Full Text Available Abstract Background Many systems for routine public health surveillance rely on centralized collection of potentially identifiable, individual, identifiable personal health information (PHI records. Although individual, identifiable patient records are essential for conditions for which there is mandated reporting, such as tuberculosis or sexually transmitted diseases, they are not routinely required for effective syndromic surveillance. Public concern about the routine collection of large quantities of PHI to support non-traditional public health functions may make alternative surveillance methods that do not rely on centralized identifiable PHI databases increasingly desirable. Methods The National Bioterrorism Syndromic Surveillance Demonstration Program (NDP is an example of one alternative model. All PHI in this system is initially processed within the secured infrastructure of the health care provider that collects and holds the data, using uniform software distributed and supported by the NDP. Only highly aggregated count data is transferred to the datacenter for statistical processing and display. Results Detailed, patient level information is readily available to the health care provider to elucidate signals observed in the aggregated data, or for ad hoc queries. We briefly describe the benefits and disadvantages associated with this distributed processing model for routine automated syndromic surveillance. Conclusion For well-defined surveillance requirements, the model can be successfully deployed with very low risk of inadvertent disclosure of PHI – a feature that may make participation in surveillance systems more feasible for organizations and more appealing to the individuals whose PHI they hold. It is possible to design and implement distributed systems to support non-routine public health needs if required.

  12. Public investment and intergenerational distribution

    NARCIS (Netherlands)

    Heijdra, BJ; Meijdam, L

    2002-01-01

    We study the effects of public investment in a dynamic overlapping-generations model of a small open economy. Boosting public investment stimulates private capital formation, output, and wages in the long run. The impact effects depend critically on whether public capital is modelled as a stock or a

  13. Water Treatment Technology - Distribution Systems.

    Science.gov (United States)

    Ross-Harrington, Melinda; Kincaid, G. David

    One of twelve water treatment technology units, this student manual on distribution systems provides instructional materials for six competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: types of pipe for distribution systems, types…

  14. Water Treatment Technology - Distribution Systems.

    Science.gov (United States)

    Ross-Harrington, Melinda; Kincaid, G. David

    One of twelve water treatment technology units, this student manual on distribution systems provides instructional materials for six competencies. (The twelve units are designed for a continuing education training course for public water supply operators.) The competencies focus on the following areas: types of pipe for distribution systems, types…

  15. Power electronic supplies for public lighting systems with distributed generation capability: solution proposals for power and minimization of the impact in grid quality

    OpenAIRE

    Quintana Barcia, Pablo José

    2016-01-01

    This PhD Thesis, entitled “Power Electronic Supplies For Public Lighting Systems With Distributed Generation Capability: Solution Proposals For Power And Control Stages, Characterization And Minimization Of The Impact In Grid Quality”, has been developed as one of the core research activities of the Efficient Energy Conversion, Industrial Electronics and Lighting Engineering group (CE3I2), from the Electrical Engineering Department (DIEECS) of the University of Oviedo. This work targets th...

  16. Distributed computer control systems

    Energy Technology Data Exchange (ETDEWEB)

    Suski, G.J.

    1986-01-01

    This book focuses on recent advances in the theory, applications and techniques for distributed computer control systems. Contents (partial): Real-time distributed computer control in a flexible manufacturing system. Semantics and implementation problems of channels in a DCCS specification. Broadcast protocols in distributed computer control systems. Design considerations of distributed control architecture for a thermal power plant. The conic toolset for building distributed systems. Network management issues in distributed control systems. Interprocessor communication system architecture in a distributed control system environment. Uni-level homogenous distributed computer control system and optimal system design. A-nets for DCCS design. A methodology for the specification and design of fault tolerant real time systems. An integrated computer control system - architecture design, engineering methodology and practical experience.

  17. Distributed System Design Checklist

    Science.gov (United States)

    Hall, Brendan; Driscoll, Kevin

    2014-01-01

    This report describes a design checklist targeted to fault-tolerant distributed electronic systems. Many of the questions and discussions in this checklist may be generally applicable to the development of any safety-critical system. However, the primary focus of this report covers the issues relating to distributed electronic system design. The questions that comprise this design checklist were created with the intent to stimulate system designers' thought processes in a way that hopefully helps them to establish a broader perspective from which they can assess the system's dependability and fault-tolerance mechanisms. While best effort was expended to make this checklist as comprehensive as possible, it is not (and cannot be) complete. Instead, we expect that this list of questions and the associated rationale for the questions will continue to evolve as lessons are learned and further knowledge is established. In this regard, it is our intent to post the questions of this checklist on a suitable public web-forum, such as the NASA DASHLink AFCS repository. From there, we hope that it can be updated, extended, and maintained after our initial research has been completed.

  18. A Laboratory-Based System for Managing and Distributing Publically Funded Geochemical Data in a Collaborative Environment

    Science.gov (United States)

    McInnes, B.; Brown, A.; Liffers, M.

    2015-12-01

    Publically funded laboratories have a responsibility to generate, archive and disseminate analytical data to the research community. Laboratory managers know however, that a long tail of analytical effort never escapes researchers' thumb drives once they leave the lab. This work reports on a research data management project (Digital Mineralogy Library) where integrated hardware and software systems automatically archive and deliver analytical data and metadata to institutional and community data portals. The scientific objective of the DML project was to quantify the modal abundance of heavy minerals extracted from key lithological units in Western Australia. The selected analytical platform was a TESCAN Integrated Mineral Analyser (TIMA) that uses EDS-based mineral classification software to image and quantify mineral abundance and grain size at micron scale resolution. The analytical workflow used a bespoke laboratory information management system (LIMS) to orchestrate: (1) the preparation of grain mounts with embedded QR codes that serve as enduring links between physical samples and analytical data, (2) the assignment of an International Geo Sample Number (IGSN) and Digital Object Identifier (DOI) to each grain mount via the System for Earth Sample Registry (SESAR), (3) the assignment of a DOI to instrument metadata via Research Data Australia, (4) the delivery of TIMA analytical outputs, including spatially registered mineralogy images and mineral abundance data, to an institutionally-based data management server, and (5) the downstream delivery of a final data product via a Google Maps interface such as the AuScope Discovery Portal. The modular design of the system permits the networking of multiple instruments within a single site or multiple collaborating research institutions. Although sharing analytical data does provide new opportunities for the geochemistry community, the creation of an open data network requires: (1) adopting open data reporting

  19. Drinking Water Distribution Systems

    Science.gov (United States)

    Learn about an overview of drinking water distribution systems, the factors that degrade water quality in the distribution system, assessments of risk, future research about these risks, and how to reduce cross-connection control risk.

  20. Smart Distribution Systems

    Directory of Open Access Journals (Sweden)

    Yazhou Jiang

    2016-04-01

    Full Text Available The increasing importance of system reliability and resilience is changing the way distribution systems are planned and operated. To achieve a distribution system self-healing against power outages, emerging technologies and devices, such as remote-controlled switches (RCSs and smart meters, are being deployed. The higher level of automation is transforming traditional distribution systems into the smart distribution systems (SDSs of the future. The availability of data and remote control capability in SDSs provides distribution operators with an opportunity to optimize system operation and control. In this paper, the development of SDSs and resulting benefits of enhanced system capabilities are discussed. A comprehensive survey is conducted on the state-of-the-art applications of RCSs and smart meters in SDSs. Specifically, a new method, called Temporal Causal Diagram (TCD, is used to incorporate outage notifications from smart meters for enhanced outage management. To fully utilize the fast operation of RCSs, the spanning tree search algorithm is used to develop service restoration strategies. Optimal placement of RCSs and the resulting enhancement of system reliability are discussed. Distribution system resilience with respect to extreme events is presented. Test cases are used to demonstrate the benefit of SDSs. Active management of distributed generators (DGs is introduced. Future research in a smart distribution environment is proposed.

  1. The public services Leipzig optimize their IT systems for the German wide distribution of electricity; Stadtwerke Leipzig optimieren IT-Systeme fuer den bundesweiten Stromvertrieb. IBM Websphere Business Integrator im Einsatz

    Energy Technology Data Exchange (ETDEWEB)

    Bergmann, I. [SerCon GmbH, Leipzig (Germany); Schoebe, I. [Perdata GmbH, Leipzig (Germany)

    2006-08-28

    Optimized business processes as well as an appropriate IT system environment are the essential basis for business success in the competitive market of German distribution of electricity. The public services Leipzig have recognized this necessity very early. Within only five months they implemented the IBM websphere business integrator as their central communication platform. (orig.)

  2. Electric distribution systems

    CERN Document Server

    Sallam, A A

    2010-01-01

    "Electricity distribution is the penultimate stage in the delivery of electricity to end users. The only book that deals with the key topics of interest to distribution system engineers, Electric Distribution Systems presents a comprehensive treatment of the subject with an emphasis on both the practical and academic points of view. Reviewing traditional and cutting-edge topics, the text is useful to practicing engineers working with utility companies and industry, undergraduate graduate and students, and faculty members who wish to increase their skills in distribution system automation and monitoring."--

  3. Distributed operating systems

    NARCIS (Netherlands)

    Mullender, Sape J.

    1987-01-01

    In the past five years, distributed operating systems research has gone through a consolidation phase. On a large number of design issues there is now considerable consensus between different research groups. In this paper, an overview of recent research in distributed systems is given. In turn, th

  4. Distributed System Evaluation

    Science.gov (United States)

    1990-07-01

    computers. If a distributed operating system is designed with aschrony in mind efficient usage of overall system resources can be employed through the...the complex problem of efficiently balancing CPU, disk, and communications resource usage in the distributed environment mast be solved by the...throughput (concuirent processing capability), survivability and availabilty , and finally interprocess communication. In measuning the concurrent

  5. Prevalence of [i]Legionella pneumophila[/i] in water distribution systems in hospitals and public buildings of the Lublin region of eastern Poland

    Directory of Open Access Journals (Sweden)

    Agnieszka Sikora

    2015-05-01

    Full Text Available Objective. The aim of this study was to determine the prevalence of [i]L. pneumophila[/i] in water supply systems, hospitals and public buildings in the Lublin region of eastern Poland. Material and methods. The study was carried out in 26 different objects in the Lublin region. The number of [i]Legionella[/i] bacteria in water samples was determined by the membrane filtration method and/or by surface inoculation in accordance with the standards. Results. The study showed the presence of[i] L. pneumophila[/i] in 166 hot water samples (74.77%. In 34.33% (n=57 of water samples the count of tested bacteria exceeded the acceptable level of >100 CFU/100 ml. Of the samples where an acceptable level of bacteria was exceeded, 49 samples had an average level of [i]L. pneumophila[/i] (100–1,000 CFU/100 ml, and the level in 8 samples was high (>1,000 CFU/100 ml. Conclusions. The water samples collected form the hot water supply system of hospitals and public buildings showed exceeded counts of[i] L. pneumophila[/i], indicating the risk of infection. The constant monitoring of water distribution systems is an important element of the control of infections caused by these organisms.

  6. Distributed generation systems model

    Energy Technology Data Exchange (ETDEWEB)

    Barklund, C.R.

    1994-12-31

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

  7. THERMAL DISTRIBUTION SYSTEM EXPERIMENT

    Energy Technology Data Exchange (ETDEWEB)

    KRAJEWSKI,R.F.; ANDREWS,J.W.; WEI,G.

    1999-09-01

    A laboratory experiment has been conducted which tests for the effects of distribution system purging on system Delivery Effectiveness (DE) as defined in ASHRAE 152P. The experiment is described in its configuration, instrumentation, and data acquisition system. Data gathered in the experiment is given and discussed. The results show that purging of the distribution system alone does not offer any improvement of the system DE. Additional supporting tests were conducted regarding experimental simulations of buffer zones and bare pipe and are also discussed.

  8. Advanced Distribution Management System

    Science.gov (United States)

    Avazov, Artur R.; Sobinova, Liubov A.

    2016-02-01

    This article describes the advisability of using advanced distribution management systems in the electricity distribution networks area and considers premises of implementing ADMS within the Smart Grid era. Also, it gives the big picture of ADMS and discusses the ADMS advantages and functionalities.

  9. A distribution management system

    Energy Technology Data Exchange (ETDEWEB)

    Verho, P.; Jaerventausta, P.; Kaerenlampi, M.; Paulasaari, H. [Tampere Univ. of Technology (Finland); Partanen, J. [Lappeenranta Univ. of Technology (Finland)

    1996-12-31

    The development of new distribution automation applications is considerably wide nowadays. One of the most interesting areas is the development of a distribution management system (DMS) as an expansion of the traditional SCADA system. At the power transmission level such a system is called an energy management system (EMS). The idea of these expansions is to provide supporting tools for control center operators in system analysis and operation planning. The needed data for new applications is mainly available in some existing systems. Thus the computer systems of utilities must be integrated. The main data source for the new applications in the control center are the AM/FM/GIS (i.e. the network database system), the SCADA, and the customer information system (CIS). The new functions can be embedded in some existing computer system. This means a strong dependency on the vendor of the existing system. An alternative strategy is to develop an independent system which is integrated with other computer systems using well-defined interfaces. The latter approach makes it possible to use the new applications in various computer environments, having only a weak dependency on the vendors of the other systems. In the research project this alternative is preferred and used in developing an independent distribution management system

  10. Consistency in Distributed Systems

    OpenAIRE

    Kemme, Bettina; Ramalingam, Ganesan; Schiper, André; Shapiro, Marc; Vaswani, Kapil

    2013-01-01

    International audience; In distributed systems, there exists a fundamental trade-off between data consistency, availability, and the ability to tolerate failures. This trade-off has significant implications on the design of the entire distributed computing infrastructure such as storage systems, compilers and runtimes, application development frameworks and programming languages. Unfortunately, it also has significant, and poorly understood, implications for the designers and developers of en...

  11. A distribution management system

    Energy Technology Data Exchange (ETDEWEB)

    Jaerventausta, P.; Verho, P.; Kaerenlampi, M.; Pitkaenen, M. [Tampere Univ. of Technology (Finland); Partanen, J. [Lappeenranta Univ. of Technology (Finland)

    1998-08-01

    The development of new distribution automation applications is considerably wide nowadays. One of the most interesting areas is the development of a distribution management system (DMS) as an expansion to the traditional SCADA system. At the power transmission level such a system is called an energy management system (EMS). The idea of these expansions is to provide supporting tools for control center operators in system analysis and operation planning. Nowadays the SCADA is the main computer system (and often the only) in the control center. However, the information displayed by the SCADA is often inadequate, and several tasks cannot be solved by a conventional SCADA system. A need for new computer applications in control center arises from the insufficiency of the SCADA and some other trends. The latter means that the overall importance of the distribution networks is increasing. The slowing down of load-growth has often made network reinforcements unprofitable. Thus the existing network must be operated more efficiently. At the same time larger distribution areas are for economical reasons being monitored at one control center and the size of the operation staff is decreasing. The quality of supply requirements are also becoming stricter. The needed data for new applications is mainly available in some existing systems. Thus the computer systems of utilities must be integrated. The main data source for the new applications in the control center are the AM/FM/GIS (i.e. the network database system), the SCADA, and the customer information system (CIS). The new functions can be embedded in some existing computer system. This means a strong dependency on the vendor of the existing system. An alternative strategy is to develop an independent system which is integrated with other computer systems using well-defined interfaces. The latter approach makes it possible to use the new applications in various computer environments, having only a weak dependency on the

  12. Quantum Key Distribution Protocol with Private-Public Key

    OpenAIRE

    Serna, Eduin H.

    2009-01-01

    A quantum cryptographic protocol based in public key cryptography combinations and private key cryptography is presented. Unlike the BB84 protocol [1] and its many variants [2,3] two quantum channels are used. The present research does not make reconciliation mechanisms of information to derive the key. A three related system of key distribution are described.

  13. Educational Innovation from Distributed Leadership: Case Study Spanish Public School

    Science.gov (United States)

    García, Ingrid

    2017-01-01

    The purpose of the communication is to present a case study of distributed leadership practices and the performances of the Principal of a public school in Madrid. Educational leadership can be considered one of the most important elements of the education system to be effective, achieve quality results, and develop processes of change and…

  14. Distributed Treatment Systems.

    Science.gov (United States)

    Zgonc, David; Baideme, Matthew

    2015-10-01

    This section presents a review of the literature published in 2014 on topics relating to distributed treatment systems. This review is divided into the following sections with multiple subsections under each: constituent removal; treatment technologies; and planning and treatment system management.

  15. Distribution management system

    Energy Technology Data Exchange (ETDEWEB)

    Verho, P.; Kaerenlampi, M.; Pitkaenen, M.; Jaerventausta, P.; Partanen, J.

    1997-12-31

    This report comprises a general description of the results obtained in the research projects `Information system applications of a distribution control center`, `Event analysis in primary substation`, and `Distribution management system` of the EDISON research program during the years of 1993 - 1997. The different domains of the project are presented in more detail in other reports. An operational state analysis of a distribution network has been made from the control center point of view and the functions which can not be solved by a conventional SCADA system are determined. The basis for new computer applications is shown to be integration of the computer systems. The main result of the work is a distribution management system (DMS), which is an autonomous system integrated to the existing information systems, SCADA and AM/FM/GIS. The system uses a large number of modelling and computation methods and provides an extensive group of advanced functions to support the distribution network monitoring, fault management, operations planning and optimization. The development platform of the system consists of a Visual C++ programming environment, Windows NT operating system and PC. During the development the DMS has been tested in a pilot utility and it is nowadays in practical use in several Finnish utilities. The use of a DMS improves the quality and economy of power supply in many ways; the outage times can, in particular, be reduced using the system. Based on the achieved experiences some parts of the DMS reached the commercialization phase, too. Initially the commercial products were developed by a software company, Versoft Oy. At present the research results are the basis of a worldwide software product supplied by ABB Transmit Co. (orig.) EDISON Research Programme. 28 refs.

  16. Public Water Supply Systems (PWS)

    Data.gov (United States)

    Kansas Data Access and Support Center — This dataset includes boundaries for most public water supply systems (PWS) in Kansas (525 municipalities, 289 rural water districts and 13 public wholesale water...

  17. Water Districts - MO 2010 Active Public Drinking Water Systems (SHP)

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This point layer represents active public drinking water systems. Each public drinking water system's distribution or service area is represented by a single point.

  18. PolicyNet Publication System

    Data.gov (United States)

    Social Security Administration — The PolicyNet Publication System project will merge the Oracle-based Policy Repository (POMS) and the SQL-Server CAMP system (MSOM) into a new system with an Oracle...

  19. On Distributed Embedded Systems

    Directory of Open Access Journals (Sweden)

    Arvindra Sehmi

    2013-01-01

    Full Text Available Thinking of distributed embedded systems (DES—let alone the more general area of embedded computing—as a unified topic is difficult. Nevertheless, it is a vastly important topic and potentially represents a revolution in information technology (IT. DES is driven by the increasing capabilities and ever-declining costs of computing and communications devices, resulting in networked systems of embedded computers whose functional components are nearly invisible to end users. Systems have the potential to alter radically the way in which people interact with their environment by linking a range of devices and sensors that will allow information to be collected, shared, and processed in unprecedented ways.

  20. Distributed Data Management and Distributed File Systems

    CERN Document Server

    Girone, Maria

    2015-01-01

    The LHC program has been successful in part due to the globally distributed computing resources used for collecting, serving, processing, and analyzing the large LHC datasets. The introduction of distributed computing early in the LHC program spawned the development of new technologies and techniques to synchronize information and data between physically separated computing centers. Two of the most challenges services are the distributed file systems and the distributed data management systems. In this paper I will discuss how we have evolved from local site services to more globally independent services in the areas of distributed file systems and data management and how these capabilities may continue to evolve into the future. I will address the design choices, the motivations, and the future evolution of the computing systems used for High Energy Physics.

  1. Distributed Deliberative Recommender Systems

    Science.gov (United States)

    Recio-García, Juan A.; Díaz-Agudo, Belén; González-Sanz, Sergio; Sanchez, Lara Quijano

    Case-Based Reasoning (CBR) is one of most successful applied AI technologies of recent years. Although many CBR systems reason locally on a previous experience base to solve new problems, in this paper we focus on distributed retrieval processes working on a network of collaborating CBR systems. In such systems, each node in a network of CBR agents collaborates, arguments and counterarguments its local results with other nodes to improve the performance of the system's global response. We describe D2ISCO: a framework to design and implement deliberative and collaborative CBR systems that is integrated as a part of jcolibritwo an established framework in the CBR community. We apply D2ISCO to one particular simplified type of CBR systems: recommender systems. We perform a first case study for a collaborative music recommender system and present the results of an experiment of the accuracy of the system results using a fuzzy version of the argumentation system AMAL and a network topology based on a social network. Besides individual recommendation we also discuss how D2ISCO can be used to improve recommendations to groups and we present a second case of study based on the movie recommendation domain with heterogeneous groups according to the group personality composition and a group topology based on a social network.

  2. Managing Distributed Knowledge Systems

    DEFF Research Database (Denmark)

    Sørensen, Brian Vejrum; Gelbuda, Modestas

    2005-01-01

    of integrating new people, building new units and adding activities to the existing organization. It is argued that knowledge is not a stable capacity that belongs to any actor alone, but that it is rather an ongoing social accomplishment, which is created and recreated as actors engage in mutual activities....... This paper contributes to the research on organizations as distributed knowledge systems by addressing two weaknesses of the social practice literature. Firstly, it downplays the importance of formal structure and organizational design and intervention efforts by key organizational members. Secondly, it does......The article argues that the growth of de novo knowledge-based organization depends on managing and coordinating increasingly growing and, therefore, distributed knowledge. Moreover, the growth in knowledge is often accompanied by an increasing organizational complexity, which is a result...

  3. Distributed road assessment system

    Science.gov (United States)

    Beer, N. Reginald; Paglieroni, David W

    2014-03-25

    A system that detects damage on or below the surface of a paved structure or pavement is provided. A distributed road assessment system includes road assessment pods and a road assessment server. Each road assessment pod includes a ground-penetrating radar antenna array and a detection system that detects road damage from the return signals as the vehicle on which the pod is mounted travels down a road. Each road assessment pod transmits to the road assessment server occurrence information describing each occurrence of road damage that is newly detected on a current scan of a road. The road assessment server maintains a road damage database of occurrence information describing the previously detected occurrences of road damage. After the road assessment server receives occurrence information for newly detected occurrences of road damage for a portion of a road, the road assessment server determines which newly detected occurrences correspond to which previously detected occurrences of road damage.

  4. Communication Facilities for Distributed Systems

    Directory of Open Access Journals (Sweden)

    V. Barladeanu

    1997-01-01

    Full Text Available The design of physical networks and communication protocols in Distributed Systems can have a direct impact on system efficiency and reliability. This paper tries to identify efficient mechanisms and paradigms for communication in distributed systems.

  5. Contracts in distributed systems

    CERN Document Server

    Bartoletti, Massimo; Zunino, Roberto; 10.4204/EPTCS.59.11

    2011-01-01

    We present a parametric calculus for contract-based computing in distributed systems. By abstracting from the actual contract language, our calculus generalises both the contracts-as-processes and contracts-as-formulae paradigms. The calculus features primitives for advertising contracts, for reaching agreements, and for querying the fulfilment of contracts. Coordination among principals happens via multi-party sessions, which are created once agreements are reached. We present two instances of our calculus, by modelling contracts as (i) processes in a variant of CCS, and (ii) as formulae in a logic. With the help of a few examples, we discuss the primitives of our calculus, as well as some possible variants.

  6. Managing Distributed Knowledge Systems

    DEFF Research Database (Denmark)

    Sørensen, Brian Vejrum; Gelbuda, Modestas

    2005-01-01

    . This paper contributes to the research on organizations as distributed knowledge systems by addressing two weaknesses of the social practice literature. Firstly, it downplays the importance of formal structure and organizational design and intervention efforts by key organizational members. Secondly, it does...... of integrating new people, building new units and adding activities to the existing organization. It is argued that knowledge is not a stable capacity that belongs to any actor alone, but that it is rather an ongoing social accomplishment, which is created and recreated as actors engage in mutual activities...

  7. Optimizing queries in distributed systems

    Directory of Open Access Journals (Sweden)

    Ion LUNGU

    2006-01-01

    Full Text Available This research presents the main elements of query optimizations in distributed systems. First, data architecture according with system level architecture in a distributed environment is presented. Then the architecture of a distributed database management system (DDBMS is described on conceptual level followed by the presentation of the distributed query execution steps on these information systems. The research ends with presentation of some aspects of distributed database query optimization and strategies used for that.

  8. Models and analysis for distributed systems

    CERN Document Server

    Haddad, Serge; Pautet, Laurent; Petrucci, Laure

    2013-01-01

    Nowadays, distributed systems are increasingly present, for public software applications as well as critical systems. software applications as well as critical systems. This title and Distributed Systems: Design and Algorithms - from the same editors - introduce the underlying concepts, the associated design techniques and the related security issues.The objective of this book is to describe the state of the art of the formal methods for the analysis of distributed systems. Numerous issues remain open and are the topics of major research projects. One current research trend consists of pro

  9. Contracts in distributed systems

    Directory of Open Access Journals (Sweden)

    Massimo Bartoletti

    2011-07-01

    Full Text Available We present a parametric calculus for contract-based computing in distributed systems. By abstracting from the actual contract language, our calculus generalises both the contracts-as-processes and contracts-as-formulae paradigms. The calculus features primitives for advertising contracts, for reaching agreements, and for querying the fulfilment of contracts. Coordination among principals happens via multi-party sessions, which are created once agreements are reached. We present two instances of our calculus, by modelling contracts as (i processes in a variant of CCS, and (ii as formulae in a logic. With the help of a few examples, we discuss the primitives of our calculus, as well as some possible variants.

  10. Distributed security in closed distributed systems

    DEFF Research Database (Denmark)

    Hernandez, Alejandro Mario

    reflected in heterogeneous security aims; the software life cycle entails evolution and this includes security expectations; the distribution is useful if the entire system is “open” to new (a priori unknown) interactions; the distribution itself poses intrinsically more complex security-related problems......, and aim at providing security to each of these individually. The approach taken is by means of access control enforcement mechanisms, providing security to the locations they are related to. We provide a framework for modelling so. All this follows techniques borrowed from the aspect-orientation community....... As this needs to be scaled up to the entire distributed system, we then focus on ways of reasoning about the resulting composition of these individual access control mechanisms. We show how, by means of relying on the semantics of our framework, we can syntactically guarantee some limited set of global security...

  11. 41 CFR 109-1.104-50 - Publication and distribution of DOE-PMR.

    Science.gov (United States)

    2010-07-01

    ... distribution of DOE-PMR. 109-1.104-50 Section 109-1.104-50 Public Contracts and Property Management Federal... GENERAL 1-INTRODUCTION 1.1-Regulation System § 109-1.104-50 Publication and distribution of DOE-PMR. The DOE-PMR will be published in the Federal Register and will appear in the CFR as Chapter 109 of...

  12. Distribution System Pricing with Distributed Energy Resources

    Energy Technology Data Exchange (ETDEWEB)

    Hledik, Ryan [The Brattle Group, Cambridge, MA (United States); Lazar, Jim [The Regulatory Assistance Project, Montpelier, VT (United States); Schwartz, Lisa [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

    2017-08-16

    Technological changes in the electric utility industry bring tremendous opportunities and significant challenges. Customers are installing clean sources of on-site generation such as rooftop solar photovoltaic (PV) systems. At the same time, smart appliances and control systems that can communicate with the grid are entering the retail market. Among the opportunities these changes create are a cleaner and more diverse power system, the ability to improve system reliability and system resilience, and the potential for lower total costs. Challenges include integrating these new resources in a way that maintains system reliability, provides an equitable sharing of system costs, and avoids unbalanced impacts on different groups of customers, including those who install distributed energy resources (DERs) and low-income households who may be the least able to afford the transition.

  13. 41 CFR 101-1.104 - Publication and distribution of FPMR.

    Science.gov (United States)

    2010-07-01

    ... 41 Public Contracts and Property Management 2 2010-07-01 2010-07-01 true Publication and distribution of FPMR. 101-1.104 Section 101-1.104 Public Contracts and Property Management Federal Property Management Regulations System FEDERAL PROPERTY MANAGEMENT REGULATIONS GENERAL 1-INTRODUCTION 1.1-Regulation...

  14. Research on Trustworthy Distributed System

    Directory of Open Access Journals (Sweden)

    LI Yuan

    2012-06-01

    Full Text Available To arrive at the goal of intensifying the trustworthiness and controllability of distributed systems, the core function of secure algorithms and chips should be fully exerted. Through building the trustworthy model between distributed system and user behaviors, constructing the architecture of trustworthiness distributed systems, intensifying the survivability of services, and strengthening the manageability of distributed systems, the secure problem of distributed systems is to be radically solved. By setting up the trustworthy computing circumstance and supplying the trustworthy validation and the active protection based on identity and behavior for trustworthy distributed system, we will reach the goal of defending the unaware viruses and inbreak. This research insists that the security, controllability, manageability, and survivability should be basic properties of a trustworthy distributed system. The key ideas and techniques involved in these properties are studied, andrecent developments and progresses are surveyed. At the same time, the technical trends and challenges are briefly discussed.

  15. RBAC Administration in Distributed Systems

    NARCIS (Netherlands)

    Dekker, M.A.C.; Crampton, J.; Etalle, S.

    2007-01-01

    Despite a large body of literature on the administration of RBAC policies in centralized systems, the problem of the administration of a distributed system has hardly been addressed. We present a formal system for modelling a distributed RBAC system and its administration. We define two basic requir

  16. Worldwide geographical distribution of ophthalmology publications.

    Science.gov (United States)

    Guerin, Marc B; Flynn, Thomas H; Brady, Janice; O'Brien, Colm J

    2009-12-01

    International peer-reviewed publications form the basis of evidence-based medicine and are one of the main indicators of ophthalmology research activity. This paper examines the origins of such articles in relation to geographical location, population demographics and economic research profiles. Publications from five ophthalmology journals over 5 years were analysed using the Medline/Pubmed search engine. Country of origin was ascertained based on the address of the corresponding author. Worldwide ophthalmology research output was analysed in relation to population demographics and research expenditure. In total, 7,754 articles from 67 countries from 2002 to 2006 were analysed. The overall number of articles published increased by over 29% during this period. The United States (US) produced the greatest number of articles. Singapore produced the most publications per 10(6) population. There was a relationship between gross domestic product (GDP) greater than $20,000 and population-adjusted output. The US followed by the United Kingdom and Japan were the greatest gross contributors. Population-adjusted figures revealed that Singapore, Iceland and Australia were the most prolific nations. There was a relationship between GDP and the top-ranked population-adjusted countries. The top 10 most productive population-adjusted countries spend relatively more on research and development than the top 10 gross contributors.

  17. Distributed public key schemes secure against continual leakage

    DEFF Research Database (Denmark)

    Akavia, Adi; Goldwasser, Shafi; Hazay, Carmit

    2012-01-01

    In this work we study distributed public key schemes secure against continual memory leakage. The secret key will be shared among two computing devices communicating over a public channel, and the decryption operation will be computed by a simple 2-party protocol between the devices. Similarly...... the value of the respective function on the internal state of the respective device (namely, on its secret share, internal randomness, and results of intermediate computations). We present distributed public key encryption (DPKE) and distributed identity based encryption (DIBE) schemes that are secure...

  18. Distribution system modeling and analysis

    CERN Document Server

    Kersting, William H

    2002-01-01

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

  19. Public health law research: exploring law in public health systems.

    Science.gov (United States)

    Ibrahim, Jennifer K; Burris, Scott; Hays, Scott

    2012-11-01

    The importance of law in the organization and operation of public health systems has long been a matter of interest to public health lawyers and practitioners, but empirical research on law as a factor in health system performance has been limited in quantity and sophistication. The emergence of Public Health Law Research and Public Health Systems and Services Research within a coordinated effort to strengthen public health research and practice has dramatically changed matters. This article introduces Public Health Law Research as an integral part of Public Health Systems and Services Research, discusses the challenges of integrating the 2 fields, and highlights 2 examples of current research that demonstrate the benefits of an integrated approach to improve the use of law in public health practice.

  20. Pension System Related Public Politics

    Directory of Open Access Journals (Sweden)

    LIVIU RADU

    2015-05-01

    Full Text Available This paper aims to find some answers regarding the long term sustainability of the pension system. Romania’s pension system originates from the invalidity insurances and pension system designed by the German cancellor Otto Eduard Leopold von Bismark in 1889. From a European perspective, Romania has to fill an obvious gap regarding the reformation of the national public pension system. International experience, particularly of the last 130 years, indicates that, in actuality, multiple pension systems have been put into function in most of the world’s countries and which are diferenciated by some elements (organizing and managing the system, defyning pension rights, method of forming the resources, the pension’s level rapported to the average income etc. and after the eficacity degree dependent on internal influences, social, economic and demographic environment, and last but not least by the political factor.

  1. Introduction to Distributed Systems

    CERN Document Server

    Thampi, Sabu M

    2009-01-01

    Computing has passed through many transformations since the birth of the first computing machines. Developments in technology have resulted in the availability of fast and inexpensive processors, and progresses in communication technology have resulted in the availability of lucrative and highly proficient computer networks. Among these, the centralized networks have one component that is shared by users all the time. All resources are accessible, but there is a single point of control as well as a single point of failure. The integration of computer and networking technologies gave birth to new paradigm of computing called distributed computing in the late 1970s. Distributed computing has changed the face of computing and offered quick and precise solutions for a variety of complex problems for different fields. Nowadays, we are fully engrossed by the information age, and expending more time communicating and gathering information through the Internet. The Internet keeps on progressing along more than a few ...

  2. Tools for Distributed Systems Monitoring

    Directory of Open Access Journals (Sweden)

    Kufel Łukasz

    2016-11-01

    Full Text Available The management of distributed systems infrastructure requires dedicated set of tools. The one tool that helps visualize current operational state of all systems and notify when failure occurs is available within monitoring solution. This paper provides an overview of monitoring approaches for gathering data from distributed systems and what are the major factors to consider when choosing a monitoring solution. Finally we discuss the tools currently available on the market.

  3. 64 FR 63334 - Proposed Construction of Frannie Water Distribution System

    Science.gov (United States)

    1999-11-19

    ... Office of Surface Mining Reclamation and Enforcement Proposed Construction of Frannie Water Distribution... application for grant funding; public comment period on request to fund the Frannie Water Distribution System... Reclamation fund to pay approximately 44 percent of the cost of building the Frannie Water Distribution System...

  4. 64 FR 63336 - Proposed Construction of Etna Water Distribution System

    Science.gov (United States)

    1999-11-19

    ... Office of Surface Mining Reclamation and Enforcement Proposed Construction of Etna Water Distribution... application for grant funding, public comment period on request to fund the Etna Water Distribution System... Reclamation Fund to pay approximately 8 percent of the cost of building the Etna Water Distribution System...

  5. Lossless and dissipative distributed systems

    NARCIS (Netherlands)

    Pillai, HK; Willems, JC

    2002-01-01

    This paper deals with linear shift-invariant distributed systems. By this we mean systems described by constant coefficient linear partial differential equations. e de ne dissipativity with respect to a quadratic differential form, i.e., a quadratic functional in the system variables and their

  6. Energy efficient distributed computing systems

    CERN Document Server

    Lee, Young-Choon

    2012-01-01

    The energy consumption issue in distributed computing systems raises various monetary, environmental and system performance concerns. Electricity consumption in the US doubled from 2000 to 2005.  From a financial and environmental standpoint, reducing the consumption of electricity is important, yet these reforms must not lead to performance degradation of the computing systems.  These contradicting constraints create a suite of complex problems that need to be resolved in order to lead to 'greener' distributed computing systems.  This book brings together a group of outsta

  7. The THUDSOS Distributed Operating System

    Institute of Scientific and Technical Information of China (English)

    廖先Zhi; 刘旭峰; 等

    1991-01-01

    The THUDSOS is a distributed operating system modeled as an abstract machine which provides decentralized control,transparency,availability,and reliability,as welol as a good degree of autonomy at each node,that makes our distributed system usable.Our operating system supports transparent access to data through network wide filesystem.The simultaneous access to any device is discussed for the case when the peripherals are treated as files.This operating system allows spawning of parallel application programs to solve problems in the fields,such as numerical analysis and artificial intelligence.

  8. Coordination control of distributed systems

    CERN Document Server

    Villa, Tiziano

    2015-01-01

    This book describes how control of distributed systems can be advanced by an integration of control, communication, and computation. The global control objectives are met by judicious combinations of local and nonlocal observations taking advantage of various forms of communication exchanges between distributed controllers. Control architectures are considered according to  increasing degrees of cooperation of local controllers:  fully distributed or decentralized control,  control with communication between controllers,  coordination control, and multilevel control.  The book covers also topics bridging computer science, communication, and control, like communication for control of networks, average consensus for distributed systems, and modeling and verification of discrete and of hybrid systems. Examples and case studies are introduced in the first part of the text and developed throughout the book. They include: control of underwater vehicles, automated-guided vehicles on a container terminal, contro...

  9. FEEDBACK ON A PUBLICLY DISTRIBUTED IMAGE DATABASE: THE MESSIDOR DATABASE

    Directory of Open Access Journals (Sweden)

    Etienne Decencière

    2014-08-01

    Full Text Available The Messidor database, which contains hundreds of eye fundus images, has been publicly distributed since 2008. It was created by the Messidor project in order to evaluate automatic lesion segmentation and diabetic retinopathy grading methods. Designing, producing and maintaining such a database entails significant costs. By publicly sharing it, one hopes to bring a valuable resource to the public research community. However, the real interest and benefit of the research community is not easy to quantify. We analyse here the feedback on the Messidor database, after more than 6 years of diffusion. This analysis should apply to other similar research databases.

  10. Systems Measures of Water Distribution System Resilience

    Energy Technology Data Exchange (ETDEWEB)

    Klise, Katherine A. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Murray, Regan [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Walker, La Tonya Nicole [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2015-01-01

    Resilience is a concept that is being used increasingly to refer to the capacity of infrastructure systems to be prepared for and able to respond effectively and rapidly to hazardous events. In Section 2 of this report, drinking water hazards, resilience literature, and available resilience tools are presented. Broader definitions, attributes and methods for measuring resilience are presented in Section 3. In Section 4, quantitative systems performance measures for water distribution systems are presented. Finally, in Section 5, the performance measures and their relevance to measuring the resilience of water systems to hazards is discussed along with needed improvements to water distribution system modeling tools.

  11. CEBAF Distributed Data Acquisition System

    CERN Document Server

    Allison, Trent

    2005-01-01

    There are thousands of signals distributed throughout Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) that are useful for troubleshooting and identifying instabilities. Many of these signals are only available locally or monitored by systems with small bandwidths that cannot identify fast transients. The Distributed Data Acquisition (Dist DAQ) system will sample and record these signals simultaneously at rates up to 40 Msps. Its primary function will be to provide waveform records from signals throughout CEBAF to the Experimental Physics and Industrial Control System (EPICS). The waveforms will be collected after the occurrence of an event trigger. These triggers will be derived from signals such as periodic timers or accelerator faults. The waveform data can then be processed to quickly identify beam transport issues, thus reducing down time and increasing CEBAF performance. The Dist DAQ system will be comprised of multiple standalone chassis distributed throughout CEBAF. They will be i...

  12. Maintaining consistency in distributed systems

    Science.gov (United States)

    Birman, Kenneth P.

    1991-01-01

    In systems designed as assemblies of independently developed components, concurrent access to data or data structures normally arises within individual programs, and is controlled using mutual exclusion constructs, such as semaphores and monitors. Where data is persistent and/or sets of operation are related to one another, transactions or linearizability may be more appropriate. Systems that incorporate cooperative styles of distributed execution often replicate or distribute data within groups of components. In these cases, group oriented consistency properties must be maintained, and tools based on the virtual synchrony execution model greatly simplify the task confronting an application developer. All three styles of distributed computing are likely to be seen in future systems - often, within the same application. This leads us to propose an integrated approach that permits applications that use virtual synchrony with concurrent objects that respect a linearizability constraint, and vice versa. Transactional subsystems are treated as a special case of linearizability.

  13. Approximate controllability of distributed systems by distributed controllers

    Directory of Open Access Journals (Sweden)

    Benzion Shklyar

    2005-04-01

    Full Text Available Approximate controllability problem for a linear distributed control system with possibly unbounded input operator, connected in a series to another distributed system without control is investigated. An initial state of the second distributed system is considered as a control parameter. Applications to control partial equations governed by hyperbolic controller, and to control delay systems governed by hereditary controller are considered.

  14. Compressed sensing for distributed systems

    CERN Document Server

    Coluccia, Giulio; Magli, Enrico

    2015-01-01

    This book presents a survey of the state-of-the art in the exciting and timely topic of compressed sensing for distributed systems. It has to be noted that, while compressed sensing has been studied for some time now, its distributed applications are relatively new. Remarkably, such applications are ideally suited to exploit all the benefits that compressed sensing can provide. The objective of this book is to provide the reader with a comprehensive survey of this topic, from the basic concepts to different classes of centralized and distributed reconstruction algorithms, as well as a comparison of these techniques. This book collects different contributions on these aspects. It presents the underlying theory in a complete and unified way for the first time, presenting various signal models and their use cases. It contains a theoretical part collecting latest results in rate-distortion analysis of distributed compressed sensing, as well as practical implementations of algorithms obtaining performance close to...

  15. Hydronic distribution system computer model

    Energy Technology Data Exchange (ETDEWEB)

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

    1994-10-01

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

  16. Applications of membrane systems in distributed systems

    Institute of Scientific and Technical Information of China (English)

    Aneta Binder; Rudolf Freund; Georg Lojka; Marion Oswald

    2007-01-01

    Based on the biological model of cell-to-cell communication proposed by A. Rustom et al. (Science, 2004, 303: 1007-1010), we investigate the possibilities to apply P systems with dynamic channels transporting membrane vesicles for describing processes in distributed systems.

  17. Enhanced distributed energy resource system

    Science.gov (United States)

    Atcitty, Stanley; Clark, Nancy H.; Boyes, John D.; Ranade, Satishkumar J.

    2007-07-03

    A power transmission system including a direct current power source electrically connected to a conversion device for converting direct current into alternating current, a conversion device connected to a power distribution system through a junction, an energy storage device capable of producing direct current connected to a converter, where the converter, such as an insulated gate bipolar transistor, converts direct current from an energy storage device into alternating current and supplies the current to the junction and subsequently to the power distribution system. A microprocessor controller, connected to a sampling and feedback module and the converter, determines when the current load is higher than a set threshold value, requiring triggering of the converter to supply supplemental current to the power transmission system.

  18. Biosecurity through Public Health System Design.

    Energy Technology Data Exchange (ETDEWEB)

    Beyeler, Walter E. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Finley, Patrick D. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Arndt, William [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Walser, Alex Christian [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Mitchell, Michael David [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-11-01

    We applied modeling and simulation to examine the real-world tradeoffs between developingcountry public-health improvement and the need to improve the identification, tracking, and security of agents with bio-weapons potential. Traditionally, the international community has applied facility-focused strategies for improving biosecurity and biosafety. This work examines how system-level assessments and improvements can foster biosecurity and biosafety. We modeled medical laboratory resources and capabilities to identify scenarios where biosurveillance goals are transparently aligned with public health needs, and resource are distributed in a way that maximizes their ability to serve patients while minimizing security a nd safety risks. Our modeling platform simulates key processes involved in healthcare system operation, such as sample collection, transport, and analysis at medical laboratories. The research reported here extends the prior art by provided two key compone nts for comparative performance assessment: a model of patient interaction dynamics, and the capability to perform uncertainty quantification. In addition, we have outlined a process for incorporating quantitative biosecurity and biosafety risk measures. Two test problems were used to exercise these research products examine (a) Systemic effects of technological innovation and (b) Right -sizing of laboratory networks.

  19. Distributed Systems: The Hard Problems

    CERN Document Server

    CERN. Geneva

    2015-01-01

    **Nicholas Bellerophon** works as a client services engineer at Basho Technologies, helping customers setup and run distributed systems at scale in the wild. He has also worked in massively multiplayer games, and recently completed a live scalable simulation engine. He is an avid TED-watcher with interests in many areas of the arts, science, and engineering, including of course high-energy physics.

  20. High Pressure Hydraulic Distribution System

    Science.gov (United States)

    1991-05-20

    to 500 0 F. 5 cycles. 5000 F room temperature to 50001F; 45 ______________ Icycles The tesis planned for the distribution system demonstrator were...American Society for Testing and Materials ASTM D412 - Tension Testing of Vulcanized Rubber ASTM D571 - Testing Automotive Hydraulic Brake Hose Society of

  1. The State Public Health Laboratory System

    OpenAIRE

    Inhorn, Stanley L.; Astles, J. Rex; Gradus, Stephen; Malmberg, Veronica; Snippes, Paula M.; Wilcke, Burton W.; White, Vanessa A.

    2010-01-01

    This article describes the development since 2000 of the State Public Health Laboratory System in the United States. These state systems collectively are related to several other recent public health laboratory (PHL) initiatives. The first is the Core Functions and Capabilities of State Public Health Laboratories, a white paper that defined the basic responsibilities of the state PHL. Another is the Centers for Disease Control and Prevention National Laboratory System (NLS) initiative, the go...

  2. World-wide distribution automation systems

    Energy Technology Data Exchange (ETDEWEB)

    Devaney, T.M.

    1994-12-31

    A worldwide power distribution automation system is outlined. Distribution automation is defined and the status of utility automation is discussed. Other topics discussed include a distribution management system, substation feeder, and customer functions, potential benefits, automation costs, planning and engineering considerations, automation trends, databases, system operation, computer modeling of system, and distribution management systems.

  3. CEBAF Distributed Data Acquisition System

    Energy Technology Data Exchange (ETDEWEB)

    Trent Allison; Thomas Powers

    2005-05-01

    There are thousands of signals distributed throughout Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) that are useful for troubleshooting and identifying instabilities. Many of these signals are only available locally or monitored by systems with small bandwidths that cannot identify fast transients. The Distributed Data Acquisition (Dist DAQ) system will sample and record these signals simultaneously at rates up to 40 Msps. Its primary function will be to provide waveform records from signals throughout CEBAF to the Experimental Physics and Industrial Control System (EPICS). The waveforms will be collected after the occurrence of an event trigger. These triggers will be derived from signals such as periodic timers or accelerator faults. The waveform data can then be processed to quickly identify beam transport issues, thus reducing down time and increasing CEBAF performance. The Dist DAQ system will be comprised of multiple standalone chassis distributed throughout CEBAF. They will be interconnected via a fiber optic network to facilitate the global triggering of events. All of the chassis will also be connected directly to the CEBAF Ethernet and run EPICS locally. This allows for more flexibility than the typical configuration of a single board computer and other custom printed circuit boards (PCB) installed in a card cage.

  4. Distributed Persistent Identifiers System Design

    Directory of Open Access Journals (Sweden)

    Pavel Golodoniuc

    2017-06-01

    Full Text Available The need to identify both digital and physical objects is ubiquitous in our society. Past and present persistent identifier (PID systems, of which there is a great variety in terms of technical and social implementation, have evolved with the advent of the Internet, which has allowed for globally unique and globally resolvable identifiers. PID systems have, by in large, catered for identifier uniqueness, integrity, and persistence, regardless of the identifier’s application domain. Trustworthiness of these systems has been measured by the criteria first defined by Bütikofer (2009 and further elaborated by Golodoniuc 'et al'. (2016 and Car 'et al'. (2017. Since many PID systems have been largely conceived and developed by a single organisation they faced challenges for widespread adoption and, most importantly, the ability to survive change of technology. We believe that a cause of PID systems that were once successful fading away is the centralisation of support infrastructure – both organisational and computing and data storage systems. In this paper, we propose a PID system design that implements the pillars of a trustworthy system – ensuring identifiers’ independence of any particular technology or organisation, implementation of core PID system functions, separation from data delivery, and enabling the system to adapt for future change. We propose decentralisation at all levels — persistent identifiers and information objects registration, resolution, and data delivery — using Distributed Hash Tables and traditional peer-to-peer networks with information replication and caching mechanisms, thus eliminating the need for a central PID data store. This will increase overall system fault tolerance thus ensuring its trustworthiness. We also discuss important aspects of the distributed system’s governance, such as the notion of the authoritative source and data integrity

  5. Hazards Data Distribution System (HDDS)

    Science.gov (United States)

    Jones, Brenda; Lamb, Rynn M.

    2015-07-09

    When emergencies occur, first responders and disaster response teams often need rapid access to aerial photography and satellite imagery that is acquired before and after the event. The U.S. Geological Survey (USGS) Hazards Data Distribution System (HDDS) provides quick and easy access to pre- and post-event imagery and geospatial datasets that support emergency response and recovery operations. The HDDS provides a single, consolidated point-of-entry and distribution system for USGS-hosted remotely sensed imagery and other geospatial datasets related to an event response. The data delivery services are provided through an interactive map-based interface that allows emergency response personnel to rapidly select and download pre-event ("baseline") and post-event emergency response imagery.

  6. System design for distributed adaptive observation systems

    NARCIS (Netherlands)

    Ditzel, M.; Kester, L.J.H.M.; Broek, S.P. van den

    2011-01-01

    Currently, there is no clear-cut approach or design methodology available for designing distributed adaptive observation systems, partly due to the necessity to combine elements and approaches from several technological and scientific communities. Recently, an effort was made addressing this issue

  7. Vulnerability assessment of distributed systems

    OpenAIRE

    Ruiz Utgés, Guifré

    2013-01-01

    In this project I have carried out a vulnerability assessment of a component of the Condor Middleware. In this assessment I have sought and found the more dangerous software vulnerabilities of this system, I have reported them to the development team such that they may be fixed, and thus improve the security of this distributed system, and the networks that use it. En este proyecto he desarrollado una evaluación de vulnerabilidades de un componente del Middleware Condor. En esta evaluación...

  8. Homeschooling within the public school system

    OpenAIRE

    Horsburgh, Fergus Bruce Norman

    2005-01-01

    Homeschooling through the public school system is a relatively new trend in education. This qualitative study focuses on the experiences of six families participating in public school homeschooling programs in British Columbia, Canada. (Parents were interviewed and the interviews were recorded with transcripts becoming the primary data for this research.) Parents' motivations for homeschooling through the public system, rather than homeschooling on their own, are centered on financial advanta...

  9. Public outcomes: Building a 21st century national innovation system that serves the public

    Energy Technology Data Exchange (ETDEWEB)

    Gover, J. [Sandia National Labs., Albuquerque, NM (United States); Huray, P.; Carayannis, E. [George Washington Univ., Washington, DC (United States)

    1997-09-01

    Federal R and D must be principally focused on solving public problems that the marketplace is failing to address. With few exceptions programs must be supported by roadmaps that show how the R and D is linked to public outcomes. Federal R and D and those who perform it must be judged in terms of the public outcomes. The overarching issues of federal R and D policy, what it should address, how to manage it, who should perform it, how to perform it, what works best, etc. are highly complex and lack a strong theoretical foundation. (In fact, the linear, assembly-line model used by policymakers is wrong.) It is time that policymakers recognize and acknowledge the uncertainty of their work and conduct a wide array of policy experiments (the authors consider SEMATECH such an experiment) that are supported by public outcome metrics. In addition to making federal R and D better address public needs, such an approach to policy making could raise the public`s interest in T and S policy. Of course, as in any experiment the results may be measured and if failures aren`t observed, it is likely that policies lack vision and imagination. It is time to abandon the budget driven federal R and D system where performers of federal R and D are treated as constituents, and replace it with a public problem--public outcome driven system where public problems are prioritized and the budget is distributed to agencies according to these priorities.

  10. Public Sector Information Systems (PSIS)

    DEFF Research Database (Denmark)

    Brooks, Laurence; Zinner Henriksen, Helle; Janssen, Marijn

    2014-01-01

    Policies are traditionally developed by experts with limited forms of stakeholder involvement. New technologies can change policy making practice through new methods of citizens’ engagement. As a result, the traditional boundaries between governments and the public are also changing. Policy makers...

  11. The ATLAS Distributed Analysis System

    CERN Document Server

    Legger, F; The ATLAS collaboration

    2014-01-01

    In the LHC operations era, analysis of the multi-petabyte ATLAS data sample by globally distributed physicists is a challenging task. To attain the required scale the ATLAS Computing Model was designed around the concept of grid computing, realized in the Worldwide LHC Computing Grid (WLCG), the largest distributed computational resource existing in the sciences. The ATLAS experiment currently stores over 140 PB of data and runs about 140,000 concurrent jobs continuously at WLCG sites. During the first run of the LHC, the ATLAS Distributed Analysis (DA) service has operated stably and scaled as planned. More than 1600 users submitted jobs in 2012, with 2 million or more analysis jobs per week, peaking at about a million jobs per day. The system dynamically distributes popular data to expedite processing and maximally utilize resources. The reliability of the DA service is high but steadily improving; grid sites are continually validated against a set of standard tests, and a dedicated team of expert shifters ...

  12. The ATLAS Distributed Analysis System

    CERN Document Server

    Legger, F; The ATLAS collaboration; Pacheco Pages, A; Stradling, A

    2013-01-01

    In the LHC operations era, analysis of the multi-petabyte ATLAS data sample by globally distributed physicists is a challenging task. To attain the required scale the ATLAS Computing Model was designed around the concept of grid computing, realized in the Worldwide LHC Computing Grid (WLCG), the largest distributed computational resource existing in the sciences. The ATLAS experiment currently stores over 140 PB of data and runs about 140,000 concurrent jobs continuously at WLCG sites. During the first run of the LHC, the ATLAS Distributed Analysis (DA) service has operated stably and scaled as planned. More than 1600 users submitted jobs in 2012, with 2 million or more analysis jobs per week, peaking at about a million jobs per day. The system dynamically distributes popular data to expedite processing and maximally utilize resources. The reliability of the DA service is high but steadily improving; grid sites are continually validated against a set of standard tests, and a dedicated team of expert shifters ...

  13. Immune System Inspired Strategies for Distributed Systems

    CERN Document Server

    Banerjee, Soumya

    2010-01-01

    Many components of the IS are constructed as modular units which do not need to communicate with each other such that the number of components increases but the size remains constant. However, a sub-modular IS architecture in which lymph node number and size both increase sublinearly with body size is shown to efficiently balance the requirements of communication and migration, consistent with experimental data. We hypothesize that the IS architecture optimizes the tradeoff between local search for pathogens and global response using antibodies. Similar to natural immune systems, physical space and resource are also important constraints on Artificial Immune Systems (AIS), especially distributed systems applications used to connect low-powered sensors using short-range wireless communication. AIS problems like distributed robot control will also require a sub-modular architecture to efficiently balance the tradeoff between local search for a solution and global response or proliferation of the solution betwee...

  14. Design and Implementation of Distributed Automated Test System about Violence in Public Places%公共场所暴力事件分布式自动检测系统设计与实现

    Institute of Scientific and Technical Information of China (English)

    韩晓英; 伍冯洁; 朱静

    2015-01-01

    本文首先根据实际需要,设计基于分布式网络视频安防监控系统;其次,详细描述具有图像分析功能摄像机工作原理与流程,完善暴力事件自动检测系统;最后,结合光流场变化情况及运动目标聚集状态判断是否存在暴力行为。实验表明,该嵌入式系统识别准确性好、实时性强、可靠性高。%According to the actual need, this paper firstly designs the security monitoring system based on distributed network video. Then it particularly describes the working principle and flow of video camera with functions of image analysis, and improves the violence testing system in public places. Finally, violence is judged according to the changes in the optical flow field and the ag-gregated state of moving objects. The experimental results show that the embedded system has good accuracy, real-time perfor-mance and high reliability for recognition.

  15. Impact of microbial distributions on food safety II. Quantifying impacts on public health and sampling

    NARCIS (Netherlands)

    Jongenburger, I.; Bassett, J.; Jackson, T.; Gorris, L.G.M.; Jewell, K.; Zwietering, M.H.

    2012-01-01

    The distributions of microorganisms in foods impact the likelihood that a foodstuff will cause illness and therefore also impact the consequential public health burden. As part of food safety management systems, food is sampled and microbiologically tested. The effectiveness of the sampling programm

  16. The Distribution of Climate Change Public Opinion in Canada.

    Science.gov (United States)

    Mildenberger, Matto; Howe, Peter; Lachapelle, Erick; Stokes, Leah; Marlon, Jennifer; Gravelle, Timothy

    2016-01-01

    While climate scientists have developed high resolution data sets on the distribution of climate risks, we still lack comparable data on the local distribution of public climate change opinions. This paper provides the first effort to estimate local climate and energy opinion variability outside the United States. Using a multi-level regression and post-stratification (MRP) approach, we estimate opinion in federal electoral districts and provinces. We demonstrate that a majority of the Canadian public consistently believes that climate change is happening. Belief in climate change's causes varies geographically, with more people attributing it to human activity in urban as opposed to rural areas. Most prominently, we find majority support for carbon cap and trade policy in every province and district. By contrast, support for carbon taxation is more heterogeneous. Compared to the distribution of US climate opinions, Canadians believe climate change is happening at higher levels. This new opinion data set will support climate policy analysis and climate policy decision making at national, provincial and local levels.

  17. Probability distributions for multimeric systems.

    Science.gov (United States)

    Albert, Jaroslav; Rooman, Marianne

    2016-01-01

    We propose a fast and accurate method of obtaining the equilibrium mono-modal joint probability distributions for multimeric systems. The method necessitates only two assumptions: the copy number of all species of molecule may be treated as continuous; and, the probability density functions (pdf) are well-approximated by multivariate skew normal distributions (MSND). Starting from the master equation, we convert the problem into a set of equations for the statistical moments which are then expressed in terms of the parameters intrinsic to the MSND. Using an optimization package on Mathematica, we minimize a Euclidian distance function comprising of a sum of the squared difference between the left and the right hand sides of these equations. Comparison of results obtained via our method with those rendered by the Gillespie algorithm demonstrates our method to be highly accurate as well as efficient.

  18. The impact of public expenditure on undernourishment distribution in Mexico.

    Science.gov (United States)

    Moreno-Macías, Lidia; Palma-Solís, Marco; Zapata-Vázquez, Rita E

    2013-09-01

    The status of undernourishment in children under the age of five in Mexico is open to debate. Linked to poverty, underweight and stunting, the rates of undernourishment are reported to be diminishing, although poverty remains an incessant problem. This study was done to determine whether there is an association between public expenditure and underweight and stunting distribution in Mexico based on data from the 2006 health and population census and from macroeconomic, social, and demographic variables. We used principal component analysis to reduce the number of variables and analyze their behavior. Multiple regressions showed that underweight and stunting are significantly associated with the marginalization index, support from the Sistema Nacional para el Desarrollo Integral de la Familia (DIF) supplies and breakfast program, the gross domestic product per capita, and expenditure from the Opportunities program. Further, public expenditure aimed to combat undernourishment is inadequately oriented to address the needs of the poor.

  19. 14 CFR 29.1355 - Distribution system.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Distribution system. 29.1355 Section 29.1355 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT... Distribution system. (a) The distribution system includes the distribution busses, their associated...

  20. 14 CFR 25.1355 - Distribution system.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Distribution system. 25.1355 Section 25.1355 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT... Distribution system. (a) The distribution system includes the distribution busses, their associated...

  1. First Exploration on Merit Pay Distribution System in Geological Exploration Public Institution%地勘事业单位绩效工资分配制度初探

    Institute of Scientific and Technical Information of China (English)

    李清秋

    2016-01-01

    地勘事业单位现行工资制度存在重资历、重累计工龄,轻现实贡献等等弊端,个人学历、工龄、职称等与其实际技能与经验没划上等号,分配制度对优秀人才的吸引力不足。为充分发挥工资制度的激励作用,须进一步深化人事和工资制度改革,建立量化考核的岗位绩效工资制,重视岗位分析工作,达到薪随工作绩效变化,薪随岗变的薪资管理目的。要进一步加大岗位责任、工作业绩、实际贡献等绩效倾斜力度,搞活内部分配,增强活力,充分发挥绩效工资分配的激励作用,必须进行科学合理的定编定岗、绩效考核细则,实行全面绩效考核。%The current salary system in geological exploration public institution has several shortcomings, for instance, mianly foucus on the working years, and regardless of the actual contribution. The personal education background, working years, the technical title do not fit the actual technical ability and experiences. The distribution system dose not has enough attraction for some excellent people. For the sake of fully develop the incentive function of the salary system, we should go ahead and deepen the revolution of personnel and salary system, and build quantitative assessment for merit-based pay system. We should pay more attentio to the analysis for the position, and let the salary vary with the job performance, and finally reaches the salary mangement goal which the salary vary with the job position. We should develop the job-position-responsibility-based, job-performance-based and actual-contribution-based pay system. We can achieve the flexible inside distribution, enhance the inside vitality, and then fully develop the incentive function of the salary system. We have to follow the scientific and reasonable way to determine job position and performance assessment rules to carry out the comprehensive performance assessment.

  2. Distributed Stepping Motor Control System

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The beam diagnostic devices used at RIBLL are driven by stepper motors, which are controlled by I/O modules based on ISA-bus in an industrial computer. The disadvantages of such mode are that a large number of long cables are used and one computer to control is unsafe. We have developed a distributed stepping motor control system for the remote, local and centralized control of the stepping motors. RS-485 bus is used for the connection between the remote control unit and the local control units. The con...

  3. Rethinking Information Systems in the Public Sector

    DEFF Research Database (Denmark)

    Medaglia, Rony

    2014-01-01

    This section of Information Polity consists of papers presented during the workshop “Rethinking Information Systems in the Public Sector: Bridging Academia and Public Service”. The workshop was held on 8 June 2014 in Tel Aviv, Israel, in conjunction with the European Conference on Information...... Systems (ECIS 2014), and it is part of the activities of the Special Interest Group for eGovernment (SIGeGov) of the Association for Information Systems (AIS)....

  4. 64 FR 18634 - Proposed Ridgewater Water Distribution System Project in Wyoming

    Science.gov (United States)

    1999-04-15

    ... Office of Surface Mining Reclamation and Enforcement Proposed Ridgewater Water Distribution System... Improvement District water distribution system in Converse County, Wyoming. In its application, the State... distribution system in Converse County, Wyoming. This water distribution system is a public facility in a...

  5. Distributed control system for vehicles

    Science.gov (United States)

    Callen, Jeffrey N.; Iaconis, John M.

    1997-01-01

    Previously, control systems for remotely controlled vehicles (RCVs) and unmanned ground vehicles (UGVs) have largely been of a centralized design, in which all vehicles sensing and servo control systems are individually interfaces to a central computer. These controllers often have been completely redeveloped for each new application. This approach leads to increased development, installation, and maintenance costs, and to a product that is not easily adaptable to other platforms or tasks. Under a Phase II SBIR program, RedZone Robotics is developing a distributed control systems (DCS) that reduces development, installation, and maintenance costs while enhancing adaptability to other platforms or applications. The DCS consists of a distributed control network of small, intelligent local controller nodes acting on the vehicle motion and sensing system components. A central card oversees the network and handles higher level commands. The central card and local nodes are linked through the controller area network serial bus. The node hardware is of standardized design so that application specific tasks are largely accomplished in software. The standardized design makes the DCS potentially compatible with multiple UGV platforms and eventual dual-use applications in commercial vehicles. More sophisticated functionality, such as remote control or autonomous navigation can be layered on top of the low level control supplied by DCS. Thus, the DCS can be an enabling component for development of advanced UGV technologies. ALso, intelligent nodes enable fault identification and orderly shutdown to be accomplished directly at the vehicle actuators. This SBIR is sponsored by the US Army Tank-Automotive Research, Development and Engineering Center.

  6. Public Address Systems. Specifications - Installation - Operation.

    Science.gov (United States)

    Palmer, Fred M.

    Provisions for public address in new construction of campus buildings (specifications, installations, and operation of public address systems), are discussed in non-technical terms. Consideration is given to microphones, amplifiers, loudspeakers and the placement and operation of various different combinations. (FS)

  7. Loss Allocation in a Distribution System with Distributed Generation Units

    DEFF Research Database (Denmark)

    Lund, Torsten; Nielsen, Arne Hejde; Sørensen, Poul Ejnar

    2007-01-01

    In Denmark, a large part of the electricity is produced by wind turbines and combined heat and power plants (CHPs). Most of them are connected to the network through distribution systems. This paper presents a new algorithm for allocation of the losses in a distribution system with distributed...... generation. The algorithm is based on a reduced impedance matrix of the network and current injections from loads and production units. With the algorithm, the effect of the covariance between production and consumption can be evaluated. To verify the theoretical results, a model of the distribution system...

  8. Introduction to Hadoop Distributed File System

    Directory of Open Access Journals (Sweden)

    Vaibhav Gopal korat

    2012-04-01

    Full Text Available HDFS is a distributed file system designed to hold very large amounts of data (terabytes or even petabytes, and provide high-throughput access to this information. Files are stored in a redundant fashion across multiple machines to ensure their durability to failure and high availability to very parallel applications. This paper includes the step by step introduction to the file system to distributed file system and to the Hadoop Distributed File System. Section I introduces What is file System, Need of File System, Conventional File System, its advantages, Need of Distributed File System, What is Distributed File System and Benefits of Distributed File System. Also the analysis of large dataset and comparison of mapreducce with RDBMS, HPC and Grid Computing communities have been doing large-scale data processing for years. Sections II introduce the concept of Hadoop Distributed File System. Lastly section III contains Conclusion followed with the References.

  9. Designing a new class of distributed systems

    CERN Document Server

    Mikkilineni, Rao

    2011-01-01

    Designing a New Class of Distributed Systems closely examines the Distributed Intelligent Managed Element (DIME) Computing Model, a new model for distributed systems, and provides a guide to implementing Distributed Managed Workflows with High Reliability, Availability, Performance and Security. The book also explores the viability of self-optimizing, self-monitoring autonomous DIME-based computing systems. Designing a New Class of Distributed Systems is designed for practitioners as a reference guide for innovative distributed systems design. Researchers working in a related field will also f

  10. Distributed Slicing in Dynamic Systems

    CERN Document Server

    Fernandez, Antonio; Jimenez, Ernesto; Kermarrec, Anne-Marie; Raynal, Michel

    2007-01-01

    Peer to peer (P2P) systems are moving from application specific architectures to a generic service oriented design philosophy. This raises interesting problems in connection with providing useful P2P middleware services capable of dealing with resource assignment and management in a large-scale, heterogeneous and unreliable environment. The slicing service, has been proposed to allow for an automatic partitioning of P2P networks into groups (slices) that represent a controllable amount of some resource and that are also relatively homogeneous with respect to that resource. In this paper we propose two gossip-based algorithms to solve the distributed slicing problem. The first algorithm speeds up an existing algorithm sorting a set of uniform random numbers. The second algorithm statistically approximates the rank of nodes in the ordering. The scalability, efficiency and resilience to dynamics of both algorithms rely on their gossip-based models. These algorithms are proved viable theoretically and experimenta...

  11. Media System, Public Knowledge and Democracy

    DEFF Research Database (Denmark)

    Curran, James; Iyengar, Shanto; Lund, Anker Brink;

    2009-01-01

    This article addresses the implications of the movement towards entertainment-centred, market-driven media by comparing what is reported and what the public knows in four countries with different media systems. The different systems are public service (Denmark and Finland), a `dual' model (UK...... consumption and contributes to a smaller within-nation knowledge gap between the advantaged and disadvantaged. But wider processes in society take precedence over the organization of the media in determining how much people know about public life...

  12. A distributed program composition system

    Science.gov (United States)

    Brown, Robert L.

    1989-01-01

    A graphical technique for creating distributed computer programs is investigated and a prototype implementation is described which serves as a testbed for the concepts. The type of programs under examination is restricted to those comprising relatively heavyweight parts that intercommunicate by passing messages of typed objects. Such programs are often presented visually as a directed graph with computer program parts as the nodes and communication channels as the edges. This class of programs, called parts-based programs, is not well supported by existing computer systems; much manual work is required to describe the program to the system, establish the communication paths, accommodate the heterogeneity of data types, and to locate the parts of the program on the various systems involved. The work described solves most of these problems by providing an interface for describing parts-based programs in this class in a way that closely models the way programmers think about them: using sketches of diagraphs. Program parts, the computational modes of the larger program system are categorized in libraries and are accessed with browsers. The process of programming has the programmer draw the program graph interactively. Heterogeneity is automatically accommodated by the insertion of type translators where necessary between the parts. Many decisions are necessary in the creation of a comprehensive tool for interactive creation of programs in this class. Possibilities are explored and the issues behind such decisions are presented. An approach to program composition is described, not a carefully implemented programming environment. However, a prototype implementation is described that can demonstrate the ideas presented.

  13. Interoperability of heterogeneous distributed systems

    Science.gov (United States)

    Zaschke, C.; Essendorfer, B.; Kerth, C.

    2016-05-01

    To achieve knowledge superiority in today's operations interoperability is the key. Budget restrictions as well as the complexity and multiplicity of threats combined with the fact that not single nations but whole areas are subject to attacks force nations to collaborate and share information as appropriate. Multiple data and information sources produce different kinds of data, real time and non-real time, in different formats that are disseminated to the respective command and control level for further distribution. The data is most of the time highly sensitive and restricted in terms of sharing. The question is how to make this data available to the right people at the right time with the right granularity. The Coalition Shared Data concept aims to provide a solution to these questions. It has been developed within several multinational projects and evolved over time. A continuous improvement process was established and resulted in the adaptation of the architecture as well as the technical solution and the processes it supports. Coming from the idea of making use of existing standards and basing the concept on sharing of data through standardized interfaces and formats and enabling metadata based query the concept merged with a more sophisticated service based approach. The paper addresses concepts for information sharing to facilitate interoperability between heterogeneous distributed systems. It introduces the methods that were used and the challenges that had to be overcome. Furthermore, the paper gives a perspective how the concept could be used in the future and what measures have to be taken to successfully bring it into operations.

  14. Control and operation of distributed generation in distribution systems

    DEFF Research Database (Denmark)

    Mahat, Pukar; Chen, Zhe; Bak-Jensen, Birgitte

    2011-01-01

    Many distribution systems nowadays have significant penetration of distributed generation (DG)and thus, islanding operation of these distribution systems is becoming a viable option for economical and technical reasons. The DG should operate optimally during both grid-connected and island...... algorithm, which uses average rate of change off requency (Af5) and real power shift RPS), in the islanded mode. RPS will increase or decrease the power set point of the generator with increasing or decreasing system frequency, respectively. Simulation results show that the proposed method can operate...

  15. Wind Power in Electrical Distribution Systems

    DEFF Research Database (Denmark)

    Chen, Zhe

    2013-01-01

    as distributed generators in distribution systems. This paper discusses the issues of wind turbines in distribution systems. Wind power conversion systems briefly introduced, the basic features and technical characteristics of distributed wind power system are described, and the main technical demands......Recent years, wind power is experiencing a rapid growth, large number of wind turbines/wind farms have been installed and connected to power systems. In addition to the large centralised wind farms connected to transmission grids, many distributed wind turbines and wind farms are operated...

  16. Quantum walk public-key cryptographic system

    Science.gov (United States)

    Vlachou, C.; Rodrigues, J.; Mateus, P.; Paunković, N.; Souto, A.

    2015-12-01

    Quantum Cryptography is a rapidly developing field of research that benefits from the properties of Quantum Mechanics in performing cryptographic tasks. Quantum walks are a powerful model for quantum computation and very promising for quantum information processing. In this paper, we present a quantum public-key cryptographic system based on quantum walks. In particular, in the proposed protocol the public-key is given by a quantum state generated by performing a quantum walk. We show that the protocol is secure and analyze the complexity of public key generation and encryption/decryption procedures.

  17. Distributed optimal coordination for distributed energy resources in power systems

    DEFF Research Database (Denmark)

    Wu, Di; Yang, Tao; Stoorvogel, A.

    2017-01-01

    Driven by smart grid technologies, distributed energy resources (DERs) have been rapidly developing in recent years for improving reliability and efficiency of distribution systems. Emerging DERs require effective and efficient coordination in order to reap their potential benefits. In this paper...

  18. Quantum walks public key cryptographic system

    OpenAIRE

    Vlachou, C; Rodrigues, J.; Mateus, P.; Paunković, N.; Souto, A.

    2016-01-01

    Quantum Cryptography is a rapidly developing field of research that benefits from the properties of Quantum Mechanics in performing cryptographic tasks. Quantum walks are a powerful model for quantum computation and very promising for quantum information processing. In this paper, we present a quantum public-key cryptographic system based on quantum walks. In particular, in the proposed protocol the public key is given by a quantum state generated by performing a quantum walk. We show that th...

  19. Low jitter RF distribution system

    Science.gov (United States)

    Wilcox, Russell; Doolittle, Lawrence; Huang, Gang

    2012-09-18

    A timing signal distribution system includes an optical frequency stabilized laser signal amplitude modulated at an rf frequency. A transmitter box transmits a first portion of the laser signal and receive a modified optical signal, and outputs a second portion of the laser signal and a portion of the modified optical signal. A first optical fiber carries the first laser signal portion and the modified optical signal, and a second optical fiber carries the second portion of the laser signal and the returned modified optical signal. A receiver box receives the first laser signal portion, shifts the frequency of the first laser signal portion outputs the modified optical signal, and outputs an electrical signal on the basis of the laser signal. A detector at the end of the second optical fiber outputs a signal based on the modified optical signal. An optical delay sensing circuit outputs a data signal based on the detected modified optical signal. An rf phase detect and correct signal circuit outputs a signal corresponding to a phase stabilized rf signal based on the data signal and the frequency received from the receiver box.

  20. Strategies for Building Distributed Information Retrieval Systems.

    Science.gov (United States)

    Macleod, Ian A.; And Others

    1987-01-01

    Discussion of the need for distributed information retrieval systems focuses on a model system, Fulcrum FUL/Text. Differences from distributed database management systems are described; system design is discussed; implementation requirements are explained including remote operation calls (ROC's); and a prototype simulation model based on FUL/Text…

  1. RELIABILITY ANALYSIS OF POWER DISTRIBUTION SYSTEMS

    Directory of Open Access Journals (Sweden)

    Popescu V.S.

    2012-04-01

    Full Text Available Power distribution systems are basic parts of power systems and reliability of these systems at present is a key issue for power engineering development and requires special attention. Operation of distribution systems is accompanied by a number of factors that produce random data a large number of unplanned interruptions. Research has shown that the predominant factors that have a significant influence on the reliability of distribution systems are: weather conditions (39.7%, defects in equipment(25% and unknown random factors (20.1%. In the article is studied the influence of random behavior and are presented estimations of reliability of predominantly rural electrical distribution systems.

  2. Water Fluoridation Reporting System (Public Water Systems)

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Water Fluoridation Reporting System (WFRS) has been developed to provide tools to assist states in managing fluoridation programs. WFRS is designed to track all...

  3. Implementation of Computational Electromagnetic on Distributed Systems

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Now the new generation of technology could raise the bar for distributed computing. It seems to be a trend to solve computational electromagnetic work on a distributed system with parallel computing techniques. In this paper, we analyze the parallel characteristics of the distributed system and the possibility of setting up a tightly coupled distributed system by using LAN in our lab. The analysis of the performance of different computational methods, such as FEM, MOM, FDTD and finite difference method, are given. Our work on setting up a distributed system and the performance of the test bed is also included. At last, we mention the implementation of one of our computational electromagnetic codes.

  4. Review on Islanding Operation of Distribution System with Distributed Generation

    DEFF Research Database (Denmark)

    Mahat, Pukar; Chen, Zhe; Bak-Jensen, Birgitte

    2011-01-01

    The growing environmental concern and various benefits of distributed generation (DG) have resulted in significant penetration of DG in many distribution systems worldwide. One of the major expected benefits of DG is the improvement in the reliability of power supply by supplying load during power...... outage by operating in an island mode. However, there are many challenges to overcome before islanding operation of a distribution system with DG can become a viable solution in future. This paper reviews some of the major challenges with islanding operation and explores some possible solutions...

  5. Flywheel-Based Distributed Bus Signalling Strategy for the Public Fast Charging Station

    DEFF Research Database (Denmark)

    Dragicevic, Tomislav; Sucic, Stepjan; Vasquez, Juan Carlos;

    2014-01-01

    have power ratings of up to 100 kW, they may expose the utility mains to intolerable stresses in the near future scenario where there will be a large number of public FCS spread across the network. This paper proposes an internal power balancing strategy for FCS based on flywheel energy storage system...... (ESS) which is able to mitigate those impacts by ramping the initial power peak. The balancing strategy was implemented in a distributed manner to grid and flywheel interfacing converters by means of distributed bus signaling (DBS) method. Since the parameters in the proposed upper hierarchical control...

  6. A Bluetooth Solution for Public Information Systems

    Directory of Open Access Journals (Sweden)

    Nicolae Radu MARSANU

    2011-01-01

    Full Text Available This paper gives insights into the opportunities offered by the Bluetooth technology. Bluetooth advertising proves to be a cheap and strong tool for enriching and improving the experience offered by a public transport system, by delivering dense and essential information about topics of interest. Alongside the Java platform, new applications can be designed and implemented to make use of the already available Bluetooth technology incorporated in devices in the target public’s custody. The paper sets focus on the segment of ready to be made available content regarding general information about the routes and timetables of the vehicles integrated in a public transport system.

  7. Water sample-collection and distribution system

    Science.gov (United States)

    Brooks, R. R.

    1978-01-01

    Collection and distribution system samples water from six designated stations, filtered if desired, and delivers it to various analytical sensors. System may be controlled by Water Monitoring Data Acquisition System or operated manually.

  8. Research in Distributed Real-Time Systems

    Science.gov (United States)

    Mukkamala, R.

    1997-01-01

    This document summarizes the progress we have made on our study of issues concerning the schedulability of real-time systems. Our study has produced several results in the scalability issues of distributed real-time systems. In particular, we have used our techniques to resolve schedulability issues in distributed systems with end-to-end requirements. During the next year (1997-98), we propose to extend the current work to address the modeling and workload characterization issues in distributed real-time systems. In particular, we propose to investigate the effect of different workload models and component models on the design and the subsequent performance of distributed real-time systems.

  9. Performance related issues in distributed database systems

    Science.gov (United States)

    Mukkamala, Ravi

    1991-01-01

    The key elements of research performed during the year long effort of this project are: Investigate the effects of heterogeneity in distributed real time systems; Study the requirements to TRAC towards building a heterogeneous database system; Study the effects of performance modeling on distributed database performance; and Experiment with an ORACLE based heterogeneous system.

  10. Public health research systems in the European union

    Directory of Open Access Journals (Sweden)

    McCarthy Mark

    2011-10-01

    Full Text Available Abstract Background Strengthening health research is an important objective for international health organisations, but there has been less attention to support for health research in Europe. We describe the public-health (population and organisational level research systems in the 27 European Union countries. Methods We developed a typology for describing health research structures based on funding streams and strategies. We drew data from internet sources and asked country informants to review these for consistency and completeness. The structures were described as organograms and narratives in country profiles for each of the 27 EU member states. National public-health research structures included public and independent funding organisations, 'mixed' institutions (which receive funds, and both use and allocate them and provider institutions. Results Most health research is funded through ministries of science or science councils (and sometimes foundations, while parliaments and regions may also contribute. National institutes of public health are usually funded by ministries of health. Many national research organisations both determine research programmes and undertake health research, but there is a move towards public-health sciences within the universities, and a transition from internal grants to competitive funding. Of 27 national research strategies, 17 referred to health and 11 to public health themes. Although all countries had strategies for public health itself, we found little coherence in public-health research programmes. The European Commission has country contact points for both EU research and health programmes, but they do not coordinate with national health-research programmes. Conclusions Public-health research is broadly distributed across programmes in EU countries. Better understanding of research structures, programmes and results would improve recognition for public health in Europe, and contribute to practice. EU

  11. Automated Energy Distribution and Reliability System Status Report

    Energy Technology Data Exchange (ETDEWEB)

    Buche, D. L.; Perry, S.

    2007-10-01

    This report describes Northern Indiana Public Service Co. project efforts to develop an automated energy distribution and reliability system. The purpose of this project was to implement a database-driven GIS solution that would manage all of the company's gas, electric, and landbase objects.

  12. Post-processing procedure for industrial quantum key distribution systems

    Science.gov (United States)

    Kiktenko, Evgeny; Trushechkin, Anton; Kurochkin, Yury; Fedorov, Aleksey

    2016-08-01

    We present algorithmic solutions aimed on post-processing procedure for industrial quantum key distribution systems with hardware sifting. The main steps of the procedure are error correction, parameter estimation, and privacy amplification. Authentication of classical public communication channel is also considered.

  13. Automated Energy Distribution and Reliability System (AEDR): Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Buche, D. L.

    2008-07-01

    This report describes Northern Indiana Public Service Co. project efforts to develop an automated energy distribution and reliability system. The purpose of this project was to implement a database-driven GIS solution that would manage all of the company's gas, electric, and landbase objects.

  14. Security Issues in Distributed Database System Model

    OpenAIRE

    MD.TABREZ QUASIM

    2013-01-01

    This paper reviews the most common as well as emerging security mechanism used in distributed database system. As distributed database became more popular, the need for improvement in distributed database management system become even more important. The most important issue is security that may arise and possibly compromise the access control and the integrity of the system. In this paper, we propose some solution for some security aspects such as multi-level access control, ...

  15. 17 CFR 230.139a - Publications by brokers or dealers distributing asset-backed securities.

    Science.gov (United States)

    2010-04-01

    ... dealers distributing asset-backed securities. 230.139a Section 230.139a Commodity and Securities Exchanges... Publications by brokers or dealers distributing asset-backed securities. The publication or distribution by a broker or dealer of information, an opinion or a recommendation with respect to asset-backed securities...

  16. Paperless Transaction for Publication Incentive System

    Science.gov (United States)

    Ibrahim, Rosziati; Madon, Hamiza Diana; Nazri, Nurul Hashida Amira Mohd; Saarani, Norhafizah; Mustapha, Aida

    2017-08-01

    Within the Malaysian context, incentive system in scientific publishing rewards authors for publishing journal articles or conference papers that are indexed by Scopus. At Universiti Tun Hussein Onn Malaysia, the incentive system is going into its third year in operational. The main challenge lies in preparing the evidences as required by the application guideline. This paper presents an online module for publication incentive within the University Publication Information System (SMPU). The module was developed using the Scrum methodology based on the existing workflow of paper-based application. The module is hoped to increase the quality of the system deliverables of SMPU as well as having the ability to cope with change of university requirements in the future.

  17. An Evaluation of Spatial Distribution of Public Parking Facilities in Huizhou Downtown

    Science.gov (United States)

    Chen, Jiasheng; Bai, Yang; Chen, Ying

    2016-11-01

    The survey and evaluation of existing public parking facilities were carried out, which had important practical significance to resolve conflicts over demand and supply of parking facilities. Taking Huizhou downtown as a study area, we surveyed parking facilities mainly by daily observing and recording. Parking facilities supply, characteristics, and demand were analysed by calculating parking utilization and turnover rate. Based on GIS, the distance-based and time-based accessibility of parking facilities were analysed to evaluate spatial distribution. The results indicated that a large spatial difference in supply and characteristics of parking was shown in public parking facilities of Huizhou downtown and that the parking demand was large. Furthermore, there existed imbalance in spatial distribution of parking facilities in Huizhou downtown area. Our study suggested that it was imbalanced and irrational between parking facilities supply and parking demand, that the planning of parking facilities was inadequate and that management system was incomplete.

  18. Distributed Cognition and Distributed Morality: Agency, Artifacts and Systems.

    Science.gov (United States)

    Heersmink, Richard

    2017-04-01

    There are various philosophical approaches and theories describing the intimate relation people have to artifacts. In this paper, I explore the relation between two such theories, namely distributed cognition and distributed morality theory. I point out a number of similarities and differences in these views regarding the ontological status they attribute to artifacts and the larger systems they are part of. Having evaluated and compared these views, I continue by focussing on the way cognitive artifacts are used in moral practice. I specifically conceptualise how such artifacts (a) scaffold and extend moral reasoning and decision-making processes, (b) have a certain moral status which is contingent on their cognitive status, and (c) whether responsibility can be attributed to distributed systems. This paper is primarily written for those interested in the intersection of cognitive and moral theory as it relates to artifacts, but also for those independently interested in philosophical debates in extended and distributed cognition and ethics of (cognitive) technology.

  19. Monitoring of distributed systems using historical debuggers

    Science.gov (United States)

    Komorowski, Michał

    2016-09-01

    Historical debuggers are tools that give insight into the history of program execution. This functionality is usually achieved by recording logs (execution traces). There are many tools of this kind but only limited number of them is capable of monitoring of distributed systems. It is a serious problem as the majority of contemporary information systems has distributed nature. This paper shows how to monitor and trace distributed systems using historical debuggers that were designed to work locally. The proposed concept consists of an approach for the correlation of execution traces that were recorded on different nodes of a distributed system that was monitored.

  20. Security Issues in Distributed Database System Model

    Directory of Open Access Journals (Sweden)

    MD.TABREZ QUASIM

    2013-12-01

    Full Text Available This paper reviews the most common as well as emerging security mechanism used in distributed database system. As distributed database became more popular, the need for improvement in distributed database management system become even more important. The most important issue is security that may arise and possibly compromise the access control and the integrity of the system. In this paper, we propose some solution for some security aspects such as multi-level access control, confidentiality, reliability, integrity and recovery that pertain to a distributed database system.

  1. Islanding Operation of Distribution System with Distributed Generations

    DEFF Research Database (Denmark)

    Mahat, Pukar; Chen, Zhe; Bak-Jensen, Birgitte

    2010-01-01

    The growing interest in distributed generations (DGs) due to environmental concern and various other reasons have resulted in significant penetration of DGs in many distribution system worldwide. DGs come with many benefits. One of the benefits is improved reliability by supplying load during power...... outage by operating in island mode. However, there are many challenges to overcome before islanding can become a viable solution in future. This paper point outs some of the major challenges with island operation and suggests some possible solutions....

  2. Applying Distributed Object Technology to Distributed Embedded Control Systems

    DEFF Research Database (Denmark)

    Jørgensen, Bo Nørregaard; Dalgaard, Lars

    2012-01-01

    In this paper, we describe our Java RMI inspired Object Request Broker architecture MicroRMI for use with networked embedded devices. MicroRMI relieves the software developer from the tedious and error-prone job of writing communication protocols for interacting with such embedded devices. MicroR...... in developing control systems for distributed embedded platforms possessing severe resource restrictions.......RMI supports easy integration of high-level application specific control logic with low-level device specific control logic. Our experience from applying MicroRMI in the context of a distributed robotics control application, clearly demonstrates that it is feasible to use distributed object technology...

  3. Task allocation in a distributed computing system

    Science.gov (United States)

    Seward, Walter D.

    1987-01-01

    A conceptual framework is examined for task allocation in distributed systems. Application and computing system parameters critical to task allocation decision processes are discussed. Task allocation techniques are addressed which focus on achieving a balance in the load distribution among the system's processors. Equalization of computing load among the processing elements is the goal. Examples of system performance are presented for specific applications. Both static and dynamic allocation of tasks are considered and system performance is evaluated using different task allocation methodologies.

  4. Distributed computer systems theory and practice

    CERN Document Server

    Zedan, H S M

    2014-01-01

    Distributed Computer Systems: Theory and Practice is a collection of papers dealing with the design and implementation of operating systems, including distributed systems, such as the amoeba system, argus, Andrew, and grapevine. One paper discusses the concepts and notations for concurrent programming, particularly language notation used in computer programming, synchronization methods, and also compares three classes of languages. Another paper explains load balancing or load redistribution to improve system performance, namely, static balancing and adaptive load balancing. For program effici

  5. Online Scheduling in Distributed Message Converter Systems

    NARCIS (Netherlands)

    Risse, Thomas; Wombacher, Andreas; Surridge, Mike; Taylor, Steve; Aberer, Karl

    2001-01-01

    The optimal distribution of jobs among hosts in distributed environments is an important factor to achieve high performance. The optimal strategy depends on the application. In this paper we present a new online scheduling strategy for distributed EDI converter system. The strategy is based on the B

  6. Online Scheduling in Distributed Message Converter Systems

    NARCIS (Netherlands)

    Risse, Thomas; Wombacher, Andreas; Surridge, Mike; Taylor, Steve; Aberer, Karl

    2001-01-01

    The optimal distribution of jobs among hosts in distributed environments is an important factor to achieve high performance. The optimal strategy depends on the application. In this paper we present a new online scheduling strategy for distributed EDI converter system. The strategy is based on the B

  7. Online Scheduling in Distributed Message Converter Systems

    NARCIS (Netherlands)

    Risse, Thomas; Wombacher, Andreas; Surridge, Mike; Taylor, Steve; Aberer, Karl

    The optimal distribution of jobs among hosts in distributed environments is an important factor to achieve high performance. The optimal strategy depends on the application. In this paper we present a new online scheduling strategy for distributed EDI converter system. The strategy is based on the

  8. Public Document Room file classification system

    Energy Technology Data Exchange (ETDEWEB)

    1982-06-01

    This listing contains detailed descriptions of the file classification system for documents available from the Public Document Room (PDR) of the US Nuclear Regulatory Commission. As a public service branch of the agency, the PDR maintains facilities for receiving, processing, storing, and retrieving documents which NRC generates or receives in performing its regulatory function. Unlike a library, the PDR does not maintain collections of formally published materials, such as books, monographs, serials, periodicals, or general indexes. The documents on file at the PDR can be reports, written records of meetings (transcripts), existing or proposed regulations, the text of licenses or their amendments, and correspondence.

  9. Distribution System Planning With Distributed Generations Considering Benefits and Costs

    Directory of Open Access Journals (Sweden)

    Saeid Soudi

    2013-10-01

    Full Text Available One of the methods used in the design and utilization of distribution systems to improve power quality and reliability of load power supply of consumers, is the application of distributed generation (DG sources. In this paper, a new method is proposed for the design and utilization of distribution networks with DG resources application by finding the optimal sitting and sizing of generated power of DG with the aim of maximization of its benefits to costs. The benefits for DG are considered as system losses reduction, system reliability improvement and benefits from the sale electricity or from lack of purchase of electricity from the main system. The costs of DG are considered as initial capital, maintenance and operation cost and investment cost. In this paper to solve the optimal sitting and sizing problem a Modified particle swarm optimization (PSO is applied. Simulations are presented on a 69-bus test distribution system to verify the effectiveness of the proposed method. Results showed that the proposed high-power method to find the optimal points of problem is faster and application of DG resources reduced the losses, costs and improved the system voltage profile.

  10. Peak oil, food systems, and public health.

    Science.gov (United States)

    Neff, Roni A; Parker, Cindy L; Kirschenmann, Frederick L; Tinch, Jennifer; Lawrence, Robert S

    2011-09-01

    Peak oil is the phenomenon whereby global oil supplies will peak, then decline, with extraction growing increasingly costly. Today's globalized industrial food system depends on oil for fueling farm machinery, producing pesticides, and transporting goods. Biofuels production links oil prices to food prices. We examined food system vulnerability to rising oil prices and the public health consequences. In the short term, high food prices harm food security and equity. Over time, high prices will force the entire food system to adapt. Strong preparation and advance investment may mitigate the extent of dislocation and hunger. Certain social and policy changes could smooth adaptation; public health has an essential role in promoting a proactive, smart, and equitable transition that increases resilience and enables adequate food for all.

  11. A distributed array antenna system

    Science.gov (United States)

    Shaw, R.; Kovitz, J.

    1986-01-01

    The Space Station communication system will use microwave frequency radio links to carry digitized information from sender to receiver. The ability of the antenna system to meet stringent requirements on coverage zones, multiple users, and reliability will play an important part in the overall multiple access communication system. This paper will describe the configuration of a multibeam conformal phased array antenna and the individual microwave integrated components incoporated into this antenna system.

  12. Implementing database system for LHCb publications page

    CERN Document Server

    Abdullayev, Fakhriddin

    2017-01-01

    The LHCb is one of the main detectors of Large Hadron Collider, where physicists and scientists work together on high precision measurements of matter-antimatter asymmetries and searches for rare and forbidden decays, with the aim of discovering new and unexpected forces. The work does not only consist of analyzing data collected from experiments but also in publishing the results of those analyses. The LHCb publications are gathered on LHCb publications page to maximize their availability to both LHCb members and to the high energy community. In this project a new database system was implemented for LHCb publications page. This will help to improve access to research papers for scientists and better integration with current CERN library website and others.

  13. Strategy Guideline. Compact Air Distribution Systems

    Energy Technology Data Exchange (ETDEWEB)

    Burdick, Arlan [IBACOS, Inc., Pittsburgh, PA (United States)

    2013-06-01

    This guideline discusses the benefits and challenges of using a compact air distribution system to handle the reduced loads and reduced air volume needed to condition the space within an energy efficient home. The decision criteria for a compact air distribution system must be determined early in the whole-house design process, considering both supply and return air design. However, careful installation of a compact air distribution system can result in lower material costs from smaller equipment, shorter duct runs, and fewer outlets; increased installation efficiencies, including ease of fitting the system into conditioned space; lower loads on a better balanced HVAC system, and overall improved energy efficiency of the home.

  14. Dawning—1000 PROOS Distributed Operating System

    Institute of Scientific and Technical Information of China (English)

    孙凝晖; 刘文卓; 等

    1997-01-01

    PROOS is a distributed operating system running on the computing nodes of massively parallel processing computer Dawning-1000.It is an efficient and easily extendible micro kernel operating system.It supports the Intel NX message passing interface for communication.

  15. A Research on Distributed Emergency Monitoring System

    Institute of Scientific and Technical Information of China (English)

    WANG; Kai; LI; Hang; YANG; Hong-wei; LIU; Yang; ZHANG; Liang; CHEN; Ling; XIONG; Wen-jun

    2013-01-01

    1 Introduction The distributed emergency monitoring system(DEMS),which has distributed measurement,centralized information processing features,including integrated radiation detectors,wireless transmission evaluation and presentation software module.The system uses a GM counter and NaI(Tl)spectrometer to quickly get the information of the radiation field,and transmits the information to the on-site information

  16. Light distribution system comprising spectral conversion means

    DEFF Research Database (Denmark)

    2012-01-01

    System (200, 300) for the distribution of white light, having a supply side (201, 301, 401) and a delivery side (202, 302, 402), the system being configured for guiding light with a multitude of visible wavelengths in a propagation direction P from the supply side to the distribution side...

  17. Economic Models and Algorithms for Distributed Systems

    CERN Document Server

    Neumann, Dirk; Altmann, Jorn; Rana, Omer F

    2009-01-01

    Distributed computing models for sharing resources such as Grids, Peer-to-Peer systems, or voluntary computing are becoming increasingly popular. This book intends to discover fresh avenues of research and amendments to existing technologies, aiming at the successful deployment of commercial distributed systems

  18. Hybrid solar lighting distribution systems and components

    Science.gov (United States)

    Muhs, Jeffrey D.; Earl, Dennis D.; Beshears, David L.; Maxey, Lonnie C.; Jordan, John K.; Lind, Randall F.

    2011-07-05

    A hybrid solar lighting distribution system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates all components.

  19. Protection of Distribution Systems with Distributed Energy Resources

    DEFF Research Database (Denmark)

    Bak-Jensen, Birgitte; Browne, Matthew; Calone, Roberto

    of 17 months of work of the Joint Working Group B5/C6.26/CIRED “Protection of Distribution Systems with Distributed Energy Resources”. The working group used the CIGRE report TB421 “The impact of Renewable Energy Sources and Distributed Generation on Substation Protection and Automation”, published...... concepts and future trends accordingly. The report is structured as follows: After this preface (chapter 1), the scope of the technical brochure according to the Terms of Reference (TOR) is stated (chapter 2). Then, in the glossary, symbols and abbreviations used throughout the technical brochure...... are listed (chapter 3). The first main part of the report starts with a summary of the backgrounds on DER and current practices in protection at the distribution level (chapter 4). This chapter contains an analysis of CIGRE TB421, protection relevant characteristics of DER, a review of current practices...

  20. PUBLIC POLITICS REGARDING THE PENSION SYSTEM

    Directory of Open Access Journals (Sweden)

    Liviu RADU

    2014-05-01

    Full Text Available The said paper proposes to seak some answers regarding the long term sustainability of the pension system. Romania’s pension system originates from the invalidity insurances and pension system designed by the German cancellor Otto Eduard Leopold von Bismark in 1889. From a European perspective, Romania has to fill an obvious gap regarding the reformation of the national public pension system. International experience, particularly of the last 130 years, indicates that, in actuality, multiple pension systems have been put into function in most of the world’s countries and which are diferenciated by some elements (organizing and managing the system, defyning pension rights, method of forming the resources, the pension’s level rapported to the average income etc. and after the eficacity degree dependent on internal influences, social, economic and demographic environment, and last but not least by the political factor.

  1. Grid-connected distributed solar power systems

    Science.gov (United States)

    Moyle, R.; Chernoff, H.; Schweizer, T.

    This paper discusses some important, though often ignored, technical and economic issues of distributed solar power systems: protection of the utility system and nonsolar customers requires suitable interfaced equipment. Purchase criteria must mirror reality; most analyses use life-cycle costing with low discount rates - most buyers use short payback periods. Distributing, installing, and marketing small, distributed solar systems is more costly than most analyses estimate. Results show that certain local conditions and uncommon purchase considerations can combine to make small, distributed solar power attractive, but lower interconnect costs (per kW), lower marketing and product distribution costs, and more favorable purchase criteria make large, centralized solar energy more attractive. Specifically, the value of dispersed solar systems to investors and utilities can be higher than $2000/kw. However, typical residential owners place a value of well under $1000 on the installed system.

  2. Large scale network-centric distributed systems

    CERN Document Server

    Sarbazi-Azad, Hamid

    2014-01-01

    A highly accessible reference offering a broad range of topics and insights on large scale network-centric distributed systems Evolving from the fields of high-performance computing and networking, large scale network-centric distributed systems continues to grow as one of the most important topics in computing and communication and many interdisciplinary areas. Dealing with both wired and wireless networks, this book focuses on the design and performance issues of such systems. Large Scale Network-Centric Distributed Systems provides in-depth coverage ranging from ground-level hardware issu

  3. An Agent-Based Distributed Manufacturing System

    Institute of Scientific and Technical Information of China (English)

    J.Li; J.Y.H.Fuh; Y.F.Zhang; A.Y.C.Nee

    2006-01-01

    Agent theories have shown their promising capability in solving distributed complex system ever since its development. In this paper, one multi-agent based distributed product design and manufacturing planning system is presented. The objective of the research is to develop a distributed collaborative design environment for supporting cooperation among the existing engineering functions. In the system, the functional agents for design, manufacturability evaluation,process planning and scheduling are efficiently integrated with a facilitator agent. This paper firstly gives an introduction to the system structure, and the definitions for each executive agent are then described and a prototype of the proposed is also included at the end part.

  4. Distributed algorithms over communicating membrane systems.

    Science.gov (United States)

    Ciobanu, Gabriel

    2003-07-01

    This paper presents fundamental distributed algorithms over membrane systems with antiport carriers. We describe distributed algorithms for collecting and dispersing information, leader election in these systems, and the mutual exclusion problem. Finally, we consider membrane systems producing correct results despite some failures at some of the components or the communication links. We show that membrane systems with antiport carriers provide an appropriate model for distributed computing, particularly for message-passing algorithms interpreted here as membrane transport in both directions, namely when two chemicals behave as input and output messages and pass the membranes in both directions using antiport carriers.

  5. Region 9 Distribution System (SDWIS)

    Data.gov (United States)

    U.S. Environmental Protection Agency — EPAâ??s Safe Drinking Water Information System (SDWIS) databases store information about drinking water. The federal version (SDWIS/FED) stores the information EPA...

  6. Nonlinear dynamics in distributed systems

    CERN Document Server

    Adjali, I; Gell-Mann, Murray; Iqbal Adjali; Jose-Luis Fernandez-Villacanas; Michael Gell

    1994-01-01

    formulate it in a way that the deterministic and stochastic processes within the system are clearly separable. We show how internal fluctuations can be analysed in a systematic way using Van Kanpen's expansion method for Markov processes. We present some results for both stationary and time-dependent states. Our approach allows the effect of fluctuations to be explored, particularly in finite systems where such processes assume increasing importance.

  7. Multifunctional Information Distribution System (MIDS)

    Science.gov (United States)

    2015-12-01

    Technology, and Logistics (USD(AT&L)) Command, Control, and Communications ( C3 ), Cyber and Business Systems (C3CB) and focused on ensuring DoD is...1998 Nov 1998 May 1998 Initial Carrier Suitability Nov 1998 Nov 1998 May 1999 Nov 1998 IOT &E Complete LVT(3) Jul 1999 Jul 1999 Jan 2000 Jul 1999 LVT(2...Full Production and Fielding IOT &E - Initial Operational Test and Evaluation JTRS - Joint Tactical Radio System LP&F - Limited Production and Fielding

  8. PFS: A Distributed and Customizable File System

    NARCIS (Netherlands)

    Bosch, Peter

    1996-01-01

    In this paper we present our ongoing work on the Pegasus File System (PFS), a distributed and customizable file system that can be used for off-line file system experiments and on-line file system storage. PFS is best described as an object-oriented component library from which either a true file sy

  9. Agents-based distributed processes control systems

    Directory of Open Access Journals (Sweden)

    Adrian Gligor

    2011-12-01

    Full Text Available Large industrial distributed systems have revealed a remarkable development in recent years. We may note an increase of their structural and functional complexity, at the same time with those on requirements side. These are some reasons why there are involvednumerous researches, energy and resources to solve problems related to these types of systems. The paper addresses the issue of industrial distributed systems with special attention being given to the distributed industrial processes control systems. A solution for a distributed process control system based on mobile intelligent agents is presented.The main objective of the proposed system is to provide an optimal solution in terms of costs, maintenance, reliability and flexibility. The paper focuses on requirements, architecture, functionality and advantages brought by the proposed solution.

  10. Naming in the Distributed Operating System ZGL

    Institute of Scientific and Technical Information of China (English)

    薛行; 孙钟秀

    1991-01-01

    In this paper,the naming scheme used in the heterogeneous distributed operating system ZGL is described and some of the representative techniques utilized in current distributed operating systems are examined.It is believed that the partitioning of the name space into manyn local name spaces and one global shared name space allows the ZGL system to satisfy each workstation's demand for local autonomy and still be able to facilitate transparent resource sharing.By the division of the system into clusters and the use of a combined centralized-distributed naming mechanism,the system is able to avoid both the bottleneck problem caused by a single centralized name server for the whole system and the performance degradation due to a full distributed scheme.

  11. Applying Prolog to Develop Distributed Systems

    CERN Document Server

    Lopes, Nuno P; Rybalchenko, Andrey; Singh, Atul; 10.1017/S1471068410000360

    2010-01-01

    Development of distributed systems is a difficult task. Declarative programming techniques hold a promising potential for effectively supporting programmer in this challenge. While Datalog-based languages have been actively explored for programming distributed systems, Prolog received relatively little attention in this application area so far. In this paper we present a Prolog-based programming system, called DAHL, for the declarative development of distributed systems. DAHL extends Prolog with an event-driven control mechanism and built-in networking procedures. Our experimental evaluation using a distributed hash-table data structure, a protocol for achieving Byzantine fault tolerance, and a distributed software model checker - all implemented in DAHL - indicates the viability of the approach.

  12. Distributed-data imaging system

    Energy Technology Data Exchange (ETDEWEB)

    Tolmie, D.E.; Dornhoff, A.G.; DuBois, A.J.; Hodson, S.W.; Maestas, F.A.; Winkler, K.H.

    1996-05-01

    A group of eight Digital Equipment Corporation Alpha workstations is interconnected with ATM to form a cluster with supercomputer power. For output, each workstation drives a single tile on an 8-tile high- resolution frame buffer. A special purpose adapter is used to convert the workstation`s ATM format to the frame buffer`s HIPPI format. This paper discusses the rationale behind the workstation farm, and then describes the visualization output path in detail. To provide the system quickly, special emphasis was placed on making the design as simple as possible and using standard software protocols to drive and synchronize the display. The design choices are examined, and the resultant system is described.. Previously, a display could connect to a single computer; or a group of computers could drive a fragmented display, e.g., a video wall. Our system is unique in that it provides a high-quality desktop visualization display driven collectively by a group of workstations. A short video will be shown during the presentation to demonstrate the system capabilities.

  13. Model project for intelligent distribution systems; Modellprojekt fuer intelligente Verteilnetze

    Energy Technology Data Exchange (ETDEWEB)

    Opitsch, Bruno [Siemens AG, Nuernberg (Germany). Div. Smart Grid

    2013-06-01

    Due to the operation of photovoltaic systems, wind power plants and biomass conversion plants, the previous consumers of energy become more and more producers, so-called prosumers. This fact as well as the increasing volatile feeding of electricity from renewable energy sources require smart grids for the power distribution. The public utility Krefeld (Federal Republic of Germany) has launched a smart grid pilot project in Wachtendonk (Federal Republic of Germany) in cooperation with Siemens Smart Grid. With this, further practical experiences in the transformation of a power distribution system to a smart grid should be collected, and expertise should be built up.

  14. A DISTRIBUTED SMART HOME ARTIFICIAL INTELLIGENCE SYSTEM

    DEFF Research Database (Denmark)

    Lynggaard, Per

    2013-01-01

    the artificial intelligence system is implemented as distributed as agents running parts of the artificial intelligence system. This paper presents a distributed smart home architecture that distributes artificial intelligence in smart homes and discusses the pros and cons of such a concept. The presented......A majority of the research performed today explore artificial intelligence in smart homes by using a centralized approach where a smart home server performs the necessary calculations. This approach has some disadvantages that can be overcome by shifting focus to a distributed approach where...... distributed model is a layered model. Each layer offers a different complexity level of the embedded distributed artificial intelligence. At the lowest layer smart objects exists, they are small cheap embedded microcontroller based smart devices that are powered by batteries. The next layer contains a more...

  15. A DISTRIBUTED SMART HOME ARTIFICIAL INTELLIGENCE SYSTEM

    DEFF Research Database (Denmark)

    Lynggaard, Per

    2013-01-01

    A majority of the research performed today explore artificial intelligence in smart homes by using a centralized approach where a smart home server performs the necessary calculations. This approach has some disadvantages that can be overcome by shifting focus to a distributed approach where...... the artificial intelligence system is implemented as distributed as agents running parts of the artificial intelligence system. This paper presents a distributed smart home architecture that distributes artificial intelligence in smart homes and discusses the pros and cons of such a concept. The presented...... distributed model is a layered model. Each layer offers a different complexity level of the embedded distributed artificial intelligence. At the lowest layer smart objects exists, they are small cheap embedded microcontroller based smart devices that are powered by batteries. The next layer contains a more...

  16. Satellite power system (SPS) public outreach experiment

    Energy Technology Data Exchange (ETDEWEB)

    McNeal, S.R.

    1980-12-01

    To improve the results of the Satellite Power System (SPS) Concept Development and Evaluation Program, an outreach experiment was conducted. Three public interest groups participated: the L-5 Society (L-5), Citizen's Energy Project (CEP), and the Forum for the Advancement of Students in Science and Technology (FASST). Each group disseminated summary information about SPS to approximately 3000 constituents with a request for feedback on the SPS concept. The objectives of the outreach were to (1) determine the areas of major concern relative to the SPS concept, and (2) gain experience with an outreach process for use in future public involvement. Due to the combined efforts of all three groups, 9200 individuals/organizations received information about the SPS concept. Over 1500 receipients of this information provided feedback. The response to the outreach effort was positive for all three groups, suggesting that the effort extended by the SPS Project Division to encourage an information exchange with the public was well received. The general response to the SPS differed with each group. The L-5 position is very much in favor of SPS; CEP is very much opposed and FASST is relatively neutral. The responses are analyzed, and from the responses some questions and answers about the satellite power system are presented in the appendix. (WHK)

  17. 49 CFR 38.121 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.121 Section 38.121... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Intercity Rail Cars and Systems § 38.121 Public information system. (a) Each car shall be equipped with a public address system permitting transportation system personnel, or...

  18. Control and Operation of Islanded Distribution System

    DEFF Research Database (Denmark)

    Mahat, Pukar

    and yet continues to be energized by DG unit(s) connected to it. Currently, it is seen as a challenge and so far all DG units need to shut down when a distribution system is islanded. However, with the DG penetration expected to increase sharply, islanding is an opportunity to improve the reliability...... on frequency information, rate of change of frequency, customers’ willingness to pay and loads’ histories is proposed in this research. It sheds an optimal number of loads and stabilizes the frequency of the islanded distribution system. Short circuit power of a distribution system changes when it changes...

  19. Advanced smartgrids for distribution system operators

    CERN Document Server

    Boillot, Marc

    2014-01-01

    The dynamic of the Energy Transition is engaged in many region of the World. This is a real challenge for electric systems and a paradigm shift for existing distribution networks. With the help of "advanced" smart technologies, the Distribution System Operators will have a central role to integrate massively renewable generation, electric vehicle and demand response programs. Many projects are on-going to develop and assess advanced smart grids solutions, with already some lessons learnt. In the end, the Smart Grid is a mean for Distribution System Operators to ensure the quality and the secu

  20. Cronus: A Distributed Operating System.

    Science.gov (United States)

    1983-11-01

    423 machine interface. -24- -- mass- Report No. 5086 Bolt Beranek and Newman Inc. standard operating systems (e.g., a Digital Equipment Corporation VAX...One from Ungermann-Bass, Inc. o ProNet from Proteon Associates -120- Report No. 5086 Bolt Beranek and Newman Inc. o PolyNet from Logica , Inc. o...configuration. Polynet from Logica , Inc. Polynet is a commercial version of the Cambridge University Ring Network that has become quite popular in the

  1. 17 CFR 230.139 - Publications or distributions of research reports by brokers or dealers distributing securities.

    Science.gov (United States)

    2010-04-01

    ... for sale or an offer to sell a security or general solicitation or general advertising, in connection... 17 Commodity and Securities Exchanges 2 2010-04-01 2010-04-01 false Publications or distributions of research reports by brokers or dealers distributing securities. 230.139 Section 230.139...

  2. Distributed context-aware systems

    CERN Document Server

    Ferreira, Paulo

    2014-01-01

    Context-aware systems aim to deliver a rich user experience by taking into?account the current user context (location, time, activity, etc.), possibly?captured without his intervention. For example, cell phones are now able to?continuously update a user's location while, at the same time, users execute?an increasing amount of activities online, where their actions may be easily?captured (e.g. login in a web application) without user consent. In the last decade, this topic has seen numerous developments that demonstrate its relevance and usefulness. The?trend was accelerated with the widespread

  3. Man-systems distributed system for Space Station Freedom

    Science.gov (United States)

    Lewis, J. L.

    1990-01-01

    Viewgraphs on man-systems distributed system for Space Station Freedom are presented. Topics addressed include: description of man-systems (definition, requirements, scope, subsystems, and topologies); implementation (approach, tools); man-systems interfaces (system to element and system to system); prime/supporting development relationship; selected accomplishments; and technical challenges.

  4. Computer Systems for Distributed and Distance Learning.

    Science.gov (United States)

    Anderson, M.; Jackson, David

    2000-01-01

    Discussion of network-based learning focuses on a survey of computer systems for distributed and distance learning. Both Web-based systems and non-Web-based systems are reviewed in order to highlight some of the major trends of past projects and to suggest ways in which progress may be made in the future. (Contains 92 references.) (Author/LRW)

  5. Implementing Distributed Controllers for Systems with Priorities

    CERN Document Server

    Ben-Hafaiedh, Imene; Khairallah, Hammadi; 10.4204/EPTCS.30.3

    2010-01-01

    Implementing a component-based system in a distributed way so that it ensures some global constraints is a challenging problem. We consider here abstract specifications consisting of a composition of components and a controller given in the form of a set of interactions and a priority order amongst them. In the context of distributed systems, such a controller must be executed in a distributed fashion while still respecting the global constraints imposed by interactions and priorities. We present in this paper an implementation of an algorithm that allows a distributed execution of systems with (binary) interactions and priorities. We also present a comprehensive simulation analysis that shows how sensitive to changes our algorithm is, in particular changes related to the degree of conflict in the system.

  6. Overview of Distributed Control Systems Formalisms

    Directory of Open Access Journals (Sweden)

    Peter Holecko

    2008-01-01

    Full Text Available This paper discusses a chosen set of mainly object-oriented formal and semiformal methods, methodics, environments and tools for specification, analysis, modeling, simulation, verification, development and synthesis of distributed control systems (DCS.

  7. Distribution system protection with communication technologies

    DEFF Research Database (Denmark)

    Wei, Mu; Chen, Zhe

    2010-01-01

    Due to the communication technologies’ involvement in the distribution power system, the time-critical protection function may be implemented more accurately, therefore distribution power systems’ stability, reliability and security could be improved. This paper presents an active distribution...... power system, including CHPs (Combined Heating and Power) and small scaled WTs (Wind Turbines), as a practical example to examine the possible impacts of communication technologies on the power system. Under some fault scenarios, the power system’s responses to the fault are compared between the system...... with communication technologies and that without communication technologies. At the same time, the previously proposed study method of combining the simulations of communication and power systems is adopted in this study. The performance of a communication network adopted for power system is simulated by OPNET...

  8. Brazil's Mixed Public and Private Hospital System.

    Science.gov (United States)

    Lewis, Maureen; Penteado, Evandro; Malik, Ana Maria

    2015-01-01

    Brazil's hospital sector is vibrant and growing. Under the 1988 Brazilian constitution all citizens have the right to health care, anticipating the global commitment to Universal Health Care. Brazil's public sector prides itself on having one of the world's largest single payer health care systems, but complementing that is a significant and larger private sector that is seeing big increase in investment, utilization and prices. This article outlines the structure of the hospital system and analyzes the nature and direction of private health sector expansion. Twenty-six percent of Brazilians have private health insurance and although coverage is concentrated in the urban areas of the Southeastern part of the country, it is growing across the nation. The disease burden shift to chronic diseases affects the nature of demand and the directly affects overall health care costs, which are rising rapidly outstripping national inflation by a factor of 3. Increasingly costs will have to be brought under control to maintain the viability of the private sector. Adaption of integrated care networks and strengthening of the public reimbursement system represent important areas for improvement.

  9. Distributed operating system for NASA ground stations

    Science.gov (United States)

    Doyle, John F.

    1987-01-01

    NASA ground stations are characterized by ever changing support requirements, so application software is developed and modified on a continuing basis. A distributed operating system was designed to optimize the generation and maintenance of those applications. Unusual features include automatic program generation from detailed design graphs, on-line software modification in the testing phase, and the incorporation of a relational database within a real-time, distributed system.

  10. Distributed operating system for NASA ground stations

    Science.gov (United States)

    Doyle, John F.

    1987-01-01

    NASA ground stations are characterized by ever changing support requirements, so application software is developed and modified on a continuing basis. A distributed operating system was designed to optimize the generation and maintenance of those applications. Unusual features include automatic program generation from detailed design graphs, on-line software modification in the testing phase, and the incorporation of a relational database within a real-time, distributed system.

  11. Teachers' reflections on distributive leadership in public primary ...

    African Journals Online (AJOL)

    While the importance of the role of effective leadership in contemporary ... to complete complex tasks without distributing leadership responsibility (Hartley .... formal leadership structures but presumes that a relationship exists “between vertical.

  12. System Information Distribution in Massive MIMO Systems

    OpenAIRE

    Sörman, Simon

    2016-01-01

    The 5th generation mobile telecommunication system (5G) is currently being specified and developed, with large expectations on throughput and efficiency. While 4G and more specifically LTE might constitute a basis of the design of the network, there are some parts that should be improved. One thing to improve is the static signalling that occurs very frequently in a 4G network, of which system information such as synchronization signals, detection of network frequencies, operators, configurat...

  13. 49 CFR 38.35 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.35 Section 38.35... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Buses, Vans and Systems § 38.35 Public information system. (a... a public address system permitting the driver, or recorded or digitized human speech messages, to...

  14. 36 CFR 1192.121 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... messages, to announce stations and provide other passenger information. Alternative systems or devices... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Intercity Rail Cars and Systems § 1192.121 Public information system. (a) Each car shall be equipped with a...

  15. 36 CFR 1192.103 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... speech messages, to announce stations and provide other passenger information. Alternative systems or... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Commuter Rail Cars and Systems § 1192.103 Public information system. (a) Each car shall be equipped with an...

  16. Distributed redundancy and robustness in complex systems

    KAUST Repository

    Randles, Martin

    2011-03-01

    The uptake and increasing prevalence of Web 2.0 applications, promoting new large-scale and complex systems such as Cloud computing and the emerging Internet of Services/Things, requires tools and techniques to analyse and model methods to ensure the robustness of these new systems. This paper reports on assessing and improving complex system resilience using distributed redundancy, termed degeneracy in biological systems, to endow large-scale complicated computer systems with the same robustness that emerges in complex biological and natural systems. However, in order to promote an evolutionary approach, through emergent self-organisation, it is necessary to specify the systems in an \\'open-ended\\' manner where not all states of the system are prescribed at design-time. In particular an observer system is used to select robust topologies, within system components, based on a measurement of the first non-zero Eigen value in the Laplacian spectrum of the components\\' network graphs; also known as the algebraic connectivity. It is shown, through experimentation on a simulation, that increasing the average algebraic connectivity across the components, in a network, leads to an increase in the variety of individual components termed distributed redundancy; the capacity for structurally distinct components to perform an identical function in a particular context. The results are applied to a specific application where active clustering of like services is used to aid load balancing in a highly distributed network. Using the described procedure is shown to improve performance and distribute redundancy. © 2010 Elsevier Inc.

  17. Island partition of the distribution system with distributed generation

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    In this paper, a novel optimum island partition model based on Tree Knapsack Problem (TKP) is presented for the distribution system integrated with distributed generation (DG), and a Depth-first Dynamic Programming Algorithm (DPA) is used to solve this model. With the considerations of the load priority, controlled/uncontrolled loads, and the constraints of power balance, voltage and equipment capacity, the model can meet the practical engineering requirements very well. The island partition problem of the distribution system integrated with multiple DGs is first decomposed into multiple TKPs, each of which is solved by DPA respectively. Then, the initial optimum island partition scheme is gained through an island combination procedure, and the final island partition scheme is obtained after feasibility checking and adjustment. Since the algorithm proposed owns the advantages of strong theoretical foundation and low computational complexity, it can find the approximate optimal solution within a limited time. The results of examples demonstrate the validity of the new model and algorithm.

  18. Building a generalized distributed system model

    Science.gov (United States)

    Mukkamala, R.

    1992-01-01

    The key elements in the second year (1991-92) of our project are: (1) implementation of the distributed system prototype; (2) successful passing of the candidacy examination and a PhD proposal acceptance by the funded student; (3) design of storage efficient schemes for replicated distributed systems; and (4) modeling of gracefully degrading reliable computing systems. In the third year of the project (1992-93), we propose to: (1) complete the testing of the prototype; (2) enhance the functionality of the modules by enabling the experimentation with more complex protocols; (3) use the prototype to verify the theoretically predicted performance of locking protocols, etc.; and (4) work on issues related to real-time distributed systems. This should result in efficient protocols for these systems.

  19. Distributed Access View Integrated Database (DAVID) system

    Science.gov (United States)

    Jacobs, Barry E.

    1991-01-01

    The Distributed Access View Integrated Database (DAVID) System, which was adopted by the Astrophysics Division for their Astrophysics Data System, is a solution to the system heterogeneity problem. The heterogeneous components of the Astrophysics problem is outlined. The Library and Library Consortium levels of the DAVID approach are described. The 'books' and 'kits' level is discussed. The Universal Object Typer Management System level is described. The relation of the DAVID project with the Small Business Innovative Research (SBIR) program is explained.

  20. Sustainable public health systems for rare diseases.

    Science.gov (United States)

    Ferrelli, Rita Maria; Gentile, Amalia Egle; De Santis, Marta; Taruscio, Domenica

    2017-01-01

    In the framework of the Joint Action for Rare Diseases (RD-ACTION), a specific task was defined to identify mechanisms influencing sustainability, equity and resilience of health systems for rare diseases (RDs). Literature narrative review on health systems sustainability and resilience for RDs. Years: 2000-2015. Databases: PubMed, Scopus, EBSCOHost, EMBAL, PASCAL, EMBASE, STN International and GoogleScholar. interpretive synthesis concept and thematic analysis (Dixon-Wood, et al.). 97 papers and 4 grey literature publications were identified. Two main topics stand out: economic evaluation and networks. The first topic did not identify widely accepted criterion to assign more weight to individuals with greater health needs. Healthcare network are identified as increasingly important for sustainability and resilience, in all of their aspects: professional "expertise", "experience" networks of users and carers; policy, learning, and interest networks. Possible mechanisms for ensuring sustainability can be identified in networking, patients' empowerment and reorienting healthcare towards integrated community and home care.

  1. Expert System Detects Power-Distribution Faults

    Science.gov (United States)

    Walters, Jerry L.; Quinn, Todd M.

    1994-01-01

    Autonomous Power Expert (APEX) computer program is prototype expert-system program detecting faults in electrical-power-distribution system. Assists human operators in diagnosing faults and deciding what adjustments or repairs needed for immediate recovery from faults or for maintenance to correct initially nonthreatening conditions that could develop into faults. Written in Lisp.

  2. Distilled Water Distribution Systems. Laboratory Design Notes.

    Science.gov (United States)

    Sell, J.C.

    Factors concerning water distribution systems, including an evaluation of materials and a recommendation of materials best suited for service in typical facilities are discussed. Several installations are discussed in an effort to bring out typical features in selected applications. The following system types are included--(1) industrial…

  3. Compositional modelling of distributed-parameter systems

    NARCIS (Netherlands)

    Maschke, Bernhard; Schaft, van der Arjan; Lamnabhi-Lagarrigue, F.; Loría, A.; Panteley, E.

    2005-01-01

    The Hamiltonian formulation of distributed-parameter systems has been a challenging reserach area for quite some time. (A nice introduction, especially with respect to systems stemming from fluid dynamics, can be found in [26], where also a historical account is provided.) The identification of the

  4. Distributed Database Management Systems A Practical Approach

    CERN Document Server

    Rahimi, Saeed K

    2010-01-01

    This book addresses issues related to managing data across a distributed database system. It is unique because it covers traditional database theory and current research, explaining the difficulties in providing a unified user interface and global data dictionary. The book gives implementers guidance on hiding discrepancies across systems and creating the illusion of a single repository for users. It also includes three sample frameworksâ€"implemented using J2SE with JMS, J2EE, and Microsoft .Netâ€"that readers can use to learn how to implement a distributed database management system. IT and

  5. The NATO III 5 MHz Distribution System

    Science.gov (United States)

    Vulcan, A.; Bloch, M.

    1981-01-01

    A high performance 5 MHz distribution system is described which has extremely low phase noise and jitter characteristics and provides multiple buffered outputs. The system is completely redundant with automatic switchover and is self-testing. Since the 5 MHz reference signals distributed by the NATO III distribution system are used for up-conversion and multiplicative functions, a high degree of phase stability and isolation between outputs is necessary. Unique circuit design and packaging concepts insure that the isolation between outputs is sufficient to quarantee a phase perturbation of less than 0.0016 deg when other outputs are open circuited, short circuited or terminated in 50 ohms. Circuit design techniques include high isolation cascode amplifiers. Negative feedback stabilizes system gain and minimizes circuit phase noise contributions. Balanced lines, in lieu of single ended coaxial transmission media, minimize pickup.

  6. Control of Groundwater Remediation Process as Distributed Parameter System

    Directory of Open Access Journals (Sweden)

    Mendel M.

    2014-12-01

    Full Text Available Pollution of groundwater requires the implementation of appropriate solutions which can be deployed for several years. The case of local groundwater contamination and its subsequent spread may result in contamination of drinking water sources or other disasters. This publication aims to design and demonstrate control of pumping wells for a model task of groundwater remediation. The task consists of appropriately spaced soil with input parameters, pumping wells and control system. Model of controlled system is made in the program MODFLOW using the finitedifference method as distributed parameter system. Control problem is solved by DPS Blockset for MATLAB & Simulink.

  7. Belle II public and private cloud management in VMDIRAC system.

    Science.gov (United States)

    Grzymkowski, Rafa; Hara, Takanori; Belle computing Group, II

    2015-12-01

    The role of cloud computing technology in the distributed computing for HEP experiments grows rapidly. Some experiments (Atlas, BES-III, LHCb) already exploit private and public cloud resources for the data processing. Future experiments such as Belle II or upgraded LHC experiments will largely rely on the availability of cloud resources and therefore their computing models have to be adjusted to the specific features of cloud environment, in particular to the on-demand computing paradigm. Belle II experiment at SuperKEKB will start physics run in 2017. Belle II computing requirements are challenging. The data size at the level of hundred PB is expected after several years of operation, around 2020. The baseline solution selected for distributed processing is the DIRAC system. DIRAC can handle variety of computing resources including Grids, Clouds and independent clusters. Cloud resources can be connected by VMDIRAC module through public interfaces. In particular the mechanism of dynamic activation of new virtual machines with reserved job slots for new tasks in case of an increasing demand for computing resources is introduced. This work is focused on VMDIRAC interaction with public (Amazon EC2) and private (CC1) cloud. The solution applied by Belle II experiment and the experience from Monte Carlo production campaigns will be presented. Updated computation costs for different use cases will be shown.

  8. Distributed Monitoring System Based on ICINGA

    CERN Document Server

    Haen, C; Neufeld, N

    2011-01-01

    The LHCb online system relies on a large and heterogeneous I.T. infrastructure : it comprises more than 2000 servers and embedded systems and more than 200 network devices. While for the control and monitoring of detectors, PLCs, and readout boards an industry standard SCADA system PVSSII has been put in production, we use a low level monitoring system to monitor the control infrastructure itself. While our previous system was based on a single central NAGIOS server, our current system uses a distributed ICINGA infrastructure.

  9. 36 CFR 1192.35 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Buses, Vans and Systems § 1192.35 Public information system. (a) Vehicles in excess of 22 feet in length... passenger information within the vehicle. (b) ...

  10. 36 CFR 1192.87 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Light Rail Vehicles and Systems § 1192.87 Public information system. (a) Each vehicle shall be equipped... digitized human speech messages, to announce stations and provide other passenger information. Alternative...

  11. 36 CFR 1192.61 - Public information system.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 3 2010-07-01 2010-07-01 false Public information system... Rapid Rail Vehicles and Systems § 1192.61 Public information system. (a)(1) Requirements. Each vehicle... or digitized human speech messages, to announce stations and provide other passenger information...

  12. Acoustic CT system for temperature distribution measurement

    Institute of Scientific and Technical Information of China (English)

    Shinji Ohyama; Toyofumi Oga; Kazuo Oshima; Junya Takayama

    2008-01-01

    In this paper,a measurement method for crosssectional temperature distribution is addressed. A novel method based on an acoustic CT technique is proposed. Specifically,the temperature distributions are estimated using the time of flight data of several ultrasonic propagation paths. The times of the flight data contain both temperature and wind effect,and the method to select only temperature component is introduced. A filtered back projection method is applied to reconstruct the temperature distributions from the time of flight data. An experimental system was designed and fabricated to realize simultaneous temperature and wind velocity distribution measurements. Through this system,the effectiveness of the proposed measurement method is confirmed.

  13. Work distribution in a photonic system

    Science.gov (United States)

    Talarico, M. A. A.; Monteiro, P. B.; Mattei, E. C.; Duzzioni, E. I.; Souto Ribeiro, P. H.; Céleri, L. C.

    2016-10-01

    We present a proposal of a setup to measure the work distribution of a process acting on a quantum system emulated by the transverse degrees of freedom of classical light. Hermite-Gaussian optical modes are used to represent the energy eigenstates of a quantum harmonic oscillator prepared in a thermal state. The Fourier transform of the work distribution, or the characteristic function, can be obtained by measuring the light intensity at the output of a properly designed interferometer. The usefulness of the approach is illustrated by calculating the work distribution for a unitary operation that displaces the linear momentum of the oscillator. Other types of processes and quantum systems can be implemented with the same scheme. We also show that the setup can be used to investigate the energy distribution for open dynamics described by completely positive maps. We discuss the feasibility of the experiment, which can be realized with simple linear optical components.

  14. Information distribution in distributed microprocessor based flight control systems

    Science.gov (United States)

    Montgomery, R. C.; Lee, P. S.

    1977-01-01

    This paper presents an optimal control theory that accounts for variable time intervals in the information distribution to control effectors in a distributed microprocessor based flight control system. The theory is developed using a linear process model for the aircraft dynamics and the information distribution process is modeled as a variable time increment process where, at the time that information is supplied to the control effectors, the control effectors know the time of the next information update only in a stochastic sense. An optimal control problem is formulated and solved that provides the control law that minimizes the expected value of a quadratic cost function. An example is presented where the theory is applied to the control of the longitudinal motions of the F8-DFBW aircraft. Theoretical and simulation results indicate that, for the example problem, the optimal cost obtained using a variable time increment Markov information update process where the control effectors know only the past information update intervals and the Markov transition mechanism is almost identical to that obtained using a known uniform information update interval.

  15. Electricity distribution management Smart Grid system model

    Directory of Open Access Journals (Sweden)

    Wiesław Nowak

    2012-06-01

    Full Text Available This paper presents issues concerning the implementation of Smart Grid solutions in a real distribution network. The main components possible to quick implementation were presented. Realization of these ideas should bring tangible benefi ts to both customers and distribution system operators. Moreover the paper shows selected research results which examine proposed solutions in area of improving supply reliability and reducing energy losses in analysed network.

  16. Electricity distribution management Smart Grid system model

    OpenAIRE

    Wiesław Nowak; Wojciech Bąchorek; Szczepan Moskwa; Rafał Tarko; Waldemar Szpyra; Mariusz Benesz; Andrzej Makuch; Jarosław Łabno; Paweł Mazur

    2012-01-01

    This paper presents issues concerning the implementation of Smart Grid solutions in a real distribution network. The main components possible to quick implementation were presented. Realization of these ideas should bring tangible benefi ts to both customers and distribution system operators. Moreover the paper shows selected research results which examine proposed solutions in area of improving supply reliability and reducing energy losses in analysed network.

  17. Smart grids concept in electrical distribution system

    Directory of Open Access Journals (Sweden)

    Popović Željko N.

    2012-01-01

    Full Text Available This paper defines key business processes in electrical distribution systems and key elements and priority components that should be (redefined in these processes in order to enable the goals of smart grids concept to be fulfilled in the cost effective way. Activities undertaken in the Power Distribution Company of “Elektrovojvodina” (Serbia, which provide the basis for fulfilling the Smart Grids goals and thus enable full implementation of smart grids concept are presented in details.

  18. Visualizing Mobility of Public Transportation System.

    Science.gov (United States)

    Zeng, Wei; Fu, Chi-Wing; Arisona, Stefan Müller; Erath, Alexander; Qu, Huamin

    2014-12-01

    Public transportation systems (PTSs) play an important role in modern cities, providing shared/massive transportation services that are essential for the general public. However, due to their increasing complexity, designing effective methods to visualize and explore PTS is highly challenging. Most existing techniques employ network visualization methods and focus on showing the network topology across stops while ignoring various mobility-related factors such as riding time, transfer time, waiting time, and round-the-clock patterns. This work aims to visualize and explore passenger mobility in a PTS with a family of analytical tasks based on inputs from transportation researchers. After exploring different design alternatives, we come up with an integrated solution with three visualization modules: isochrone map view for geographical information, isotime flow map view for effective temporal information comparison and manipulation, and OD-pair journey view for detailed visual analysis of mobility factors along routes between specific origin-destination pairs. The isotime flow map linearizes a flow map into a parallel isoline representation, maximizing the visualization of mobility information along the horizontal time axis while presenting clear and smooth pathways from origin to destinations. Moreover, we devise several interactive visual query methods for users to easily explore the dynamics of PTS mobility over space and time. Lastly, we also construct a PTS mobility model from millions of real passenger trajectories, and evaluate our visualization techniques with assorted case studies with the transportation researchers.

  19. Energy optimization of water distribution system

    Energy Technology Data Exchange (ETDEWEB)

    1993-02-01

    In order to analyze pump operating scenarios for the system with the computer model, information on existing pumping equipment and the distribution system was collected. The information includes the following: component description and design criteria for line booster stations, booster stations with reservoirs, and high lift pumps at the water treatment plants; daily operations data for 1988; annual reports from fiscal year 1987/1988 to fiscal year 1991/1992; and a 1985 calibrated KYPIPE computer model of DWSD`s water distribution system which included input data for the maximum hour and average day demands on the system for that year. This information has been used to produce the inventory database of the system and will be used to develop the computer program to analyze the system.

  20. Minimization of Power Loss in Distribution Systems by Implementation of High Voltage Distribution System

    Directory of Open Access Journals (Sweden)

    PARWAL Arvind

    2013-05-01

    Full Text Available The loads in rustic area are preeminent pump sets used for various applications i.e. lift irrigation system. Minimal power factor and minimal load factor is found in loads. Further, being a factordissemination of loads, load density is found low. The present distribution system dwell of three-phase 11KV/433Volts distribution transformer with extended L.T Lines. In this system, voltage profile and reliability are poor. In this paper, HVDS is unveiled with smallcapacity distribution transformers. A simple load flow technique is used for solving distribution networks before and after implementation of HVDS. The advantages of implementing HVDS against LVDS system are discussed.

  1. Driven optomechanical systems for mechanical entanglement distribution

    CERN Document Server

    Paternostro, M; Li, Jie

    2012-01-01

    We consider the distribution of entanglement from a multi-mode optical driving source to a network of remote and independent optomechanical systems. By focusing on the tripartite case, we analyse the effects that the features of the optical input states have on the degree and sharing-structure of the distributed, fully mechanical, entanglement. This study, which is conducted looking at the mechanical steady-state, highlights the structure of the entanglement distributed among the nodes and determines the relative efficiency between bipartite and tripartite entanglement transfer. We discuss a few open points, some of which directed towards the bypassing of such limitations.

  2. Application of GIS in water distribution system assessment.

    Science.gov (United States)

    Sargaonkar, Aabha; Islam, Raisul

    2009-10-01

    Water distribution system (WDS) is the most important component of water supply chain--supplying water from source to consumer. When supply system is poorly maintained, contaminants enter into the supply pipes through cracks and this leads to significant public health risk. Being underground, pipe condition assessment is a difficult task. In this paper, a case study is presented for assessment of pipe condition in a water distribution network of Moinbagh area in Hyderabad (India). The mathematical model-Pipe Condition Assessment (PCA) Model was used, which utilizes GIS based maps of water distribution network, sewer network, drains and soil as input in addition to data on physical properties of the network as well as operational parameters. The application of PCA identified that only 3% pipes in the network were in bad condition.

  3. Plasma spraying system with distributed controlling

    Institute of Scientific and Technical Information of China (English)

    李春旭; 陈克选; 张成

    2003-01-01

    A distributed control system is designed for plasma spraying equipment and the configurations of system software and hardware is discussed. Through founding an expert database, the spraying process parameters are worked out and the initialization and control of spraying process are realized. The plasma spraying system with this control configuration can simplify the spraying operation, improve automation level of spray process, and approach the experience criterion as soon as possible.

  4. Communication Systems and Study Method for Active Distribution Power systems

    DEFF Research Database (Denmark)

    Wei, Mu; Chen, Zhe

    Due to the involvement and evolvement of communication technologies in contemporary power systems, the applications of modern communication technologies in distribution power system are becoming increasingly important. In this paper, the International Organization for Standardization (ISO....... The suitability of the communication technology to the distribution power system with active renewable energy based generation units is discussed. Subsequently the typical possible communication systems are studied by simulation. In this paper, a novel method of integrating communication system impact into power...... system simulation is presented to address the problem of lack of off-shelf research tools on the power system communication. The communication system is configured and studied by the OPNET, and the performance of an active distribution power system integrated with the communication system is simulated...

  5. A DISTRIBUTED RING ALGORITHM FOR COORDINATOR ELECTION IN DISTRIBUTED SYSTEMS

    Directory of Open Access Journals (Sweden)

    Shaik Naseera

    2016-09-01

    Full Text Available In distributed systems, nodes are connected at different geographical locations. As a part of effective resource utilization, the data and resources are shared among these nodes. A leader or pioneer is necessary to take care of this resource sharing process by eliminating conflicting among the nodes. The shared resources are to be accessed in a fair and optimal manner among all the nodes in the network. This makes the importance of electing a leader which can coordinate with all the nodes and make fair use of resources among the nodes. As nodes are distributed in different geographical locations and factors influencing its operation make it inevitable that a leader may go down temporarily or permanently. In such case a new leader has to be elected for coordination. The time taken to elect a new leader is one of the crucial factors in improving the performance of the system. In this paper, we propose a new approach for leader election to optimize the time taken for the nodes to elect the leader.

  6. The ATLAS Distributed Data Management System & Databases

    CERN Document Server

    Garonne, V; The ATLAS collaboration; Barisits, M; Beermann, T; Vigne, R; Serfon, C

    2013-01-01

    The ATLAS Distributed Data Management (DDM) System is responsible for the global management of petabytes of high energy physics data. The current system, DQ2, has a critical dependency on Relational Database Management Systems (RDBMS), like Oracle. RDBMS are well-suited to enforcing data integrity in online transaction processing applications, however, concerns have been raised about the scalability of its data warehouse-like workload. In particular, analysis of archived data or aggregation of transactional data for summary purposes is problematic. Therefore, we have evaluated new approaches to handle vast amounts of data. We have investigated a class of database technologies commonly referred to as NoSQL databases. This includes distributed filesystems, like HDFS, that support parallel execution of computational tasks on distributed data, as well as schema-less approaches via key-value stores, like HBase. In this talk we will describe our use cases in ATLAS, share our experiences with various databases used ...

  7. A Distributed Intelligent System for Emergency Convoy

    Directory of Open Access Journals (Sweden)

    Mohammed Benalla

    2016-09-01

    Full Text Available The general problem that guides this research is the ability to design a distributed intelligent system for guiding the emergency convoys; a solution that will be based on a group of agents and on the analysis of traffic in order to generate collective functional response. It fits into the broader issue of Distributed Artificial System (DAI, which is to operate a cooperatively computer agent into multi-agents system (MAS. This article describes conceptually two fundamental questions of emergency convoys. The first question is dedicated to find a response to the traffic situation (i.e. fluid way, while the second is devoted to the convoy orientation; while putting the point on the distributed and cooperative resolution for the general problem.

  8. Standard Data Exchanges for Distribution System Management

    Energy Technology Data Exchange (ETDEWEB)

    Thomas E. McDermott

    2007-10-05

    Databases and software tools for electric power distribution systems have not been integrated, and this leads to extra costs and restrictions imposed on utilities and other stakeholders. For example, distributed resource integration studies and modern grid technology assessments are more difficult and costly. New vendors face high market entry barriers, because it’s necessary to interface with large and customized data systems at each potential utility customer. This project promotes data and software tool integration, through a set of data translators based on a common object model. The data translators are delivered as open-source software, using appropriate Web software technologies. The parties who benefit include electric utilities (and their ratepayers), researchers at government laboratories and universities, small software companies wishing to enter the electric utility market, and parties wishing to interconnect distributed generation to a utility system.

  9. Converters for Distributed Power Generation Systems

    DEFF Research Database (Denmark)

    Blaabjerg, Frede; Yang, Yongheng

    2015-01-01

    Power electronics technology has become the enabling technology for the integration of distributed power generation systems (DPGS) such as offshore wind turbine power systems and commercial photovoltaic power plants. Depending on the applications, a vast array of DPGS-based power converter...... presents an overview of the power converters for the DPGS, mainly based on wind turbine systems and photovoltaic systems, covering a wide range of applications. Moreover, the modulation schemes and interfacing power filters for the power converters are also exemplified. Finally, the general control...... topologies has been developed and more are coming into the market in order to achieve an efficient and reliable power conversion from the renewables. In addition, stringent demands from both the distribution system operators and the consumers have been imposed on the renewable-based DPGS. This article...

  10. Concurrency control in distributed database systems

    CERN Document Server

    Cellary, W; Gelenbe, E

    1989-01-01

    Distributed Database Systems (DDBS) may be defined as integrated database systems composed of autonomous local databases, geographically distributed and interconnected by a computer network.The purpose of this monograph is to present DDBS concurrency control algorithms and their related performance issues. The most recent results have been taken into consideration. A detailed analysis and selection of these results has been made so as to include those which will promote applications and progress in the field. The application of the methods and algorithms presented is not limited to DDBSs but a

  11. Research on Maintenance Information Management System for Distributed Manufacture System

    Institute of Scientific and Technical Information of China (English)

    张之敬; 戴琳; 陶俐言; 周娟

    2004-01-01

    An architecture and design of a maintenance information management system for distributed manufacture system is presented in this paper, and its related key technologies are studied and implemented also. A fre of the maintenance information management system oriented human-machine monitoring is designed, and using object-oriented method, a general maintenance information management system based on SQL server engineering database and adopted client/server/database three-layer mode can be established. Then, discussions on control technologies of maintenance information management system and remote distributed diagnostics and maintenance system are emphasized. The system is not only able to identify and diagnose faults of distributed manufacture system quickly, improve system stability, but also has intelligent maintenance functions.

  12. Fusing Visual and Audio Information in a Distributed Intelligent Surveillance System for Public Transport Systems%用于公众交通系统的分布式智能监控系统中的视听信息融合

    Institute of Scientific and Technical Information of China (English)

    BennyPingLaiLo; JieSun; SergioA.Velastin

    2003-01-01

    提出了一个全新的概念,该概念表述了通过融合来自分布式视听处理系统的不同信息来提高事故检测鲁棒性以及提供更多的事件描述.最后利用来自伦敦和巴黎的现场测试验证了该系统的性能.本文是以欧盟的PRISMATICA项目为基础.%Extensive research has been conducted in applying video and audio processing algorithms for improving passenger safety and security in public transport systems. However, due to the complex and intense computations involved in the algorithms, most studies focus only on one aspect of the safety or security issues. In addition, as passengers′ behaviours and environments are fairly variable and unpredictable, the robustness of some algorithms is still in question and few of the reported results can be applied in all the different scenarios encountered in transport systems. To develop a complete and practical intelligent surveillance system, the EU project, PRISMATICA, is designed to integrate different intelligent detection devices, which includes local camera networks, crowd monitoring devices, intelligent cameras, contactless smart cards, wireless video/audio transmission, and audio surveillance systems, to monitor different safety and security concerns in railways. As different algorithms and techniques are applied in different devices, to fulfil the real-time requirement, the PRISMATICA system is designed as a distributed system where each device is a standalone process, and devices are linked and synchronized using a CORBA network. Although the resulting system is capable of monitoring and detecting different events, certain detected events could represent the same incident. In addition, the system could potentially generate too much information for operators to identify and react to incidents straight away. This paper presents a novel concept of fusing different evidences from a distributed visual and audio processing system to improve the robustness of incident

  13. School Wellness Programs: Magnitude and Distribution in New York City Public Schools

    Science.gov (United States)

    Stiefel, Leanna; Elbel, Brian; Pflugh Prescott, Melissa; Aneja, Siddhartha; Schwartz, Amy E.

    2017-01-01

    Background: Public schools provide students with opportunities to participate in many discretionary, unmandated wellness programs. Little is known about the number of these programs, their distribution across schools, and the kinds of students served. We provide evidence on these questions for New York City (NYC) public schools. Methods: Data on…

  14. School Wellness Programs: Magnitude and Distribution in New York City Public Schools

    Science.gov (United States)

    Stiefel, Leanna; Elbel, Brian; Pflugh Prescott, Melissa; Aneja, Siddhartha; Schwartz, Amy E.

    2017-01-01

    Background: Public schools provide students with opportunities to participate in many discretionary, unmandated wellness programs. Little is known about the number of these programs, their distribution across schools, and the kinds of students served. We provide evidence on these questions for New York City (NYC) public schools. Methods: Data on…

  15. Geographical distribution of medical graduates from a public university

    Directory of Open Access Journals (Sweden)

    Oscarina da Silva Ezequiel

    Full Text Available Summary Objective: To evaluate the geographic distribution and career trajectory of medical graduates and the factors associated with their choice of practice location. Method: A cross-sectional study involving graduates from December 2001 to December 2010 was conducted. A self-administered questionnaire collected demographics and geographic information (place of birth, place of residence at the time of medical school admission, place of residency training and practice location, and reason for choosing the current location. Statistical analyses assessed trends in geographic distribution of graduates, and identified factors associated with location choice (through the population density of the location chosen for professional practice. Results: A total of 563 graduates completed the questionnaire. Of those, 4.3% (n=24 reported family medicine as their medical specialty, 19.9% (n=112 reported other primary care specialties (internal medicine, pediatrics, surgery and obstetrics-gynecology and the others chose subspecialties. Larger cities were more likely to be chosen for practice, particularly for newly-graduated doctors. Job invitations received during medical residency training increased the likelihood of choosing high-populated cities. In contrast, job invitations received during medical school increased the likelihood of choosing cities less populated. Amongst those in cities with lower population density, proximity to family members was an additional influencing factor; those who chose more densely populated cities did so because of better infrastructure and recreational options. Conclusion: Most of the physicians included in this study pursue subspecialties training and were practicing medicine in large cities. Knowing the multiple factors that influenced the choice of practice location can assist in planning future strategies to reduce physician workforce misdistribution.

  16. Transient age distributions in subsurface hydrologic systems

    Science.gov (United States)

    Engdahl, Nicholas B.; McCallum, James L.; Massoudieh, Arash

    2016-12-01

    Transient age distributions have received relatively little attention in the literature over the years compared to their steady-state counterparts. All natural systems are transient given enough time and it is becoming increasingly clear that understanding these effects and how they deviate from steady conditions will be important in the future. This article provides a high-level overview of the equations, techniques, and challenges encountered when considering transient age distributions. The age distribution represents the amount of water in a sample belonging to a particular age and the transient case implies that sampling the same location at two different times will result in different age distributions. These changes may be caused by transience in the boundary conditions, forcings (inputs), or physical changes in the geometry of the flow system. The governing equation for these problems contains separate dimensions for age and time and its solutions are more involved than the solute transport or steady-state age equations. Despite the complexity, many solutions have been derived for simplified, but transient, approximations and several numerical techniques exist for modeling more complex transient age distributions. This paper presents an overview of the existing solutions and contributes new examples of transient characteristic solutions and transient particle tracking simulations. The limitations for applying the techniques described herein are no longer theoretical or technological, but are now dominated by uncertainty in the physical properties of the flow systems and the lack of data for the historic inputs.

  17. Wireless distributed functional electrical stimulation system

    Directory of Open Access Journals (Sweden)

    Jovičić Nenad S

    2012-08-01

    Full Text Available Abstract Background The control of movement in humans is hierarchical and distributed and uses feedback. An assistive system could be best integrated into the therapy of a human with a central nervous system lesion if the system is controlled in a similar manner. Here, we present a novel wireless architecture and routing protocol for a distributed functional electrical stimulation system that enables control of movement. Methods The new system comprises a set of miniature battery-powered devices with stimulating and sensing functionality mounted on the body of the subject. The devices communicate wirelessly with one coordinator device, which is connected to a host computer. The control algorithm runs on the computer in open- or closed-loop form. A prototype of the system was designed using commercial, off-the-shelf components. The propagation characteristics of electromagnetic waves and the distributed nature of the system were considered during the development of a two-hop routing protocol, which was implemented in the prototype’s software. Results The outcomes of this research include a novel system architecture and routing protocol and a functional prototype based on commercial, off-the-shelf components. A proof-of-concept study was performed on a hemiplegic subject with paresis of the right arm. The subject was tasked with generating a fully functional palmar grasp (closing of the fingers. One node was used to provide this movement, while a second node controlled the activation of extensor muscles to eliminate undesired wrist flexion. The system was tested with the open- and closed-loop control algorithms. Conclusions The system fulfilled technical and application requirements. The novel communication protocol enabled reliable real-time use of the system in both closed- and open-loop forms. The testing on a patient showed that the multi-node system could operate effectively to generate functional movement.

  18. Energy storage system control strategies for power distribution systems

    OpenAIRE

    Areewan Kajorndech; Dulpichet Rerkpreedapong

    2015-01-01

    Energy storage systems have been widely employed to attain several benefits, such as reliability improvement, stabilization of power systems connected with renewable energy resources, economic benefits and etc. To achieve the above objectives, the appropriate and effective control strategies for energy storage systems are needed to be developed. This research proposes energy storage system control strategies for power distribution systems equipped with a limited size of energy storage system ...

  19. REVIEW OF CHECKPOINTING ALGORITHMS IN DISTRIBUTED SYSTEMS

    Directory of Open Access Journals (Sweden)

    Poonam Gahlan

    2010-06-01

    Full Text Available Checkpointing is the process of saving the status information. Checkpoint is defined as a designated place in a program at which normal processing is interrupted specifically to preserve the status information necessary to allow resumption of processing at a later time. Mobile computing raises many new issues such as lack of stablestorage, low bandwidth of wireless channel, high mobility, and limited battery life. Coordinated checkpointing is an attractive approach for transparently adding fault tolerance to distributed applications since it avoids domino effects and minimizes the stable storage requirement. This paper presents the review of the algorithms,which have been reported in the literature for checkpointing. This paper also covers backward error recovery techniques for distributed systems specially the distributed mobile systems.

  20. Productive efficiency in electricity transmission and distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Pollitt, M.G. [Oxford Univ. (United Kingdom)

    1994-09-01

    This paper presents a Data Envelopment Analysis (DEA) and an OLS analysis of productive efficiency (cost efficiency) in 129 electricity transmission and 145 electricity distribution systems operating in the accounting year 1990. The transmission data contains US electric systems while the distribution data includes 136 US and 9 UK companies. The paper tests the null hypothesis that privately owned and publicly owned electricity systems do not have significantly different costs. The results of the analysis indicate two things: firstly, a strong inability to reject the null hypothesis in favour of the alternative hypothesis that privately owned firms are more efficient; and secondly, a relatively high level of technical efficiency within the UK companies in the year immediately prior to privatisation. (author)

  1. Generalized parton distributions of few body systems

    CERN Document Server

    Scopetta, S

    2007-01-01

    The relevance of measuring Generalized Parton Distributions (GPDs) for few nucleon systems is illustrated. An approach which permits to calculate the GPDs of hadrons made of composite constituents by proper convolutions is described. The application of the method to the nucleon target, assumed to be made of composite constituents is reviewed. Calculations of GPDs for few nucleon systems are summarized, with special emphasis to the $^3$He target.

  2. Workflow management in large distributed systems

    Science.gov (United States)

    Legrand, I.; Newman, H.; Voicu, R.; Dobre, C.; Grigoras, C.

    2011-12-01

    The MonALISA (Monitoring Agents using a Large Integrated Services Architecture) framework provides a distributed service system capable of controlling and optimizing large-scale, data-intensive applications. An essential part of managing large-scale, distributed data-processing facilities is a monitoring system for computing facilities, storage, networks, and the very large number of applications running on these systems in near realtime. All this monitoring information gathered for all the subsystems is essential for developing the required higher-level services—the components that provide decision support and some degree of automated decisions—and for maintaining and optimizing workflow in large-scale distributed systems. These management and global optimization functions are performed by higher-level agent-based services. We present several applications of MonALISA's higher-level services including optimized dynamic routing, control, data-transfer scheduling, distributed job scheduling, dynamic allocation of storage resource to running jobs and automated management of remote services among a large set of grid facilities.

  3. Management Of Distribution System Using GIS

    Directory of Open Access Journals (Sweden)

    Nidhi Mishra

    2014-03-01

    Full Text Available Electricity is considered as an essential need for our daily life. The power distribution companies manage the power distribution system safely and efficiently. Efficient functioning of distribution company is important to sustain the development of power sector and economy. Hence there was a need for some latest and modern systems to be utilized for improving the reliability and efficiency of power sectors. GIS(Geographical Information System came into existence as an powerful and effective tool for management of transmission and distribution system. The GIS aims to sign-out the suitable locations that are to be fed with power supply. GIS is Useful in development of accurate database,monitoring of supply and its control, analysis of commercial and customer service,energy audit, trouble call management, load management, theft detection etc. GIS technology helps the survey respondents to answer their smart grid questions and address smart grid challenges. GIS makes the smart grid smart because GIS works with data on an interactive map where it can be updated, understood, and shared."

  4. Rendezvous Facilities in a Distributed Computer System

    Institute of Scientific and Technical Information of China (English)

    廖先Zhi; 金兰

    1995-01-01

    The distributed computer system described in this paper is a set of computer nodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-passing protocols.This paper presents the implementation of rendezvous facilities as high-level primitives provided by a parallel programming language to support interprocess communication and synchronization.

  5. Wind Power in Electrical Distribution Systems

    DEFF Research Database (Denmark)

    Chen, Zhe

    2013-01-01

    Recent years, wind power is experiencing a rapid growth, large number of wind turbines/wind farms have been installed and connected to power systems. In addition to the large centralised wind farms connected to transmission grids, many distributed wind turbines and wind farms are operated as dist...

  6. Engineering High Assurance Distributed Cyber Physical Systems

    Science.gov (United States)

    2015-01-15

    Swedish JAS 39 Gripen, Boeing V-22 Osprey, and Airbus A320 -200). Embedded systems with critical runtime properties are becoming increasingly distributed...that to is manually crafted into our DSL so that the necessary verification steps can be performed. In Phase 2, the idea is to encode and formalize

  7. The "Family Tree" of Air Distribution Systems

    DEFF Research Database (Denmark)

    Nielsen, Peter V.

    2011-01-01

    that all the known types of air distribution systems are interconnected in a “family tree”. The influence of supplied momentum flow versus buoyancy forces is discussed, and geometries for high ventilation effectiveness are indicated as well as geometries for fully mixed flow. The paper will also show...

  8. Comparison between Different Air Distribution Systems

    DEFF Research Database (Denmark)

    Nielsen, Peter V.

    The aim of an air conditioning system is to remove excess heat in a room and replace room air with fresh air to obtain a high air quality. It is not sufficient to remove heat and contaminated air, it is also necessary to distribute and control the air movement in the room to create thermal comfort...

  9. Very Large Scale Distributed Information Processing Systems

    Science.gov (United States)

    1991-09-27

    34Reliable Distributed Database Management", Proc. of the IEEE, May 1987, pp. 601-620. [GOTT881 Gottlob , Georg andRoberto Zicari, "Closed World Databases... Gottlob , and Gio Wiederhold, "Interfacing Relational Databases and Prolog Efficiently," in Proceedings 2nd Expert Database Systems Conference, pp. 141

  10. Object Management in Local Distributed Systems

    Science.gov (United States)

    1985-11-01

    Theory, Vol. 2, Jack Minker et a.l. editors, Plenum Press, New York, IQ84. / A3/ Gottlob , G., P. Paolini, and R. Zicari, "Properties and Update Semantics...February 1980. /D3/ Enslow, P., "What is a ’distributed’ data processing system?" IEEE Computer, 11, 1, January 1978. /D4/ Gottlob , G. and R. Zicari

  11. The Analysis and Design of Distributed Systems

    NARCIS (Netherlands)

    Aksit, Mehmet

    1992-01-01

    The design of distributed object-oriented systems involves a number of considerations that rarely arise in sequential object-oriented design or in non-object-oriented languages. The tutorial describes analysis and design techniques for data abstraction, inheritance, delegation, persistence,

  12. Advanced design concepts for open distributed systems

    NARCIS (Netherlands)

    Pires, L.F.; Ferreira Pires, Luis; van Sinderen, Marten J.; Vissers, C.A.

    1993-01-01

    Experience with the engineering of large scale open distributed systems has shown that their design should be specified at several well defined levels of abstractions, where each level aims at satisfying specific user, architectural and implementation purposes. Therefore designers should dispose of

  13. Hybrid control of the distributed refrigeration system

    DEFF Research Database (Denmark)

    Chen, L.; Wisniewski, R.

    2010-01-01

    The supermarket refrigeration system typically has a distributed control structure, which neglects interactions between its subsystems. These interactions from time to time lead to a synchronization operation of the display-cases which causes an inferior control performance and increased energy...... or a chaotic behavior, the system is considered away from the synchronization. Therefore, the paper proposes a concept that the system may be de-synchronized by making it chaotic. A de-synchronization scheme is developed. It includes a synchronization-early-monitoring detector by calculating the maximum...... consumption. The paper focuses on synchronization dynamics of the refrigeration system modeled as a piecewise-affine switched system. System behaviors are analyzed using chaos theory. The synchronization phenomenon is interpreted as a stable low-period orbit; if the system has a high-order periodic orbit...

  14. 49 CFR 38.103 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.103 Section 38.103... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Commuter Rail Cars and Systems § 38.103 Public information system. (a... information. Alternative systems or devices which provide equivalent access are also permitted. (b) ...

  15. 49 CFR 38.61 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.61 Section 38.61... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Rapid Rail Vehicles and Systems § 38.61 Public information system. (a... other passenger information. Alternative systems or devices which provide equivalent access are also...

  16. 49 CFR 38.87 - Public information system.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Public information system. 38.87 Section 38.87... SPECIFICATIONS FOR TRANSPORTATION VEHICLES Light Rail Vehicles and Systems § 38.87 Public information system. (a... information. Alternative systems or devices which provide equivalent access are also permitted. (b) ...

  17. Laser spark distribution and ignition system

    Science.gov (United States)

    Woodruff, Steven; McIntyre, Dustin L.

    2008-09-02

    A laser spark distribution and ignition system that reduces the high power optical requirements for use in a laser ignition and distribution system allowing for the use of optical fibers for delivering the low peak energy pumping pulses to a laser amplifier or laser oscillator. An optical distributor distributes and delivers optical pumping energy from an optical pumping source to multiple combustion chambers incorporating laser oscillators or laser amplifiers for inducing a laser spark within a combustion chamber. The optical distributor preferably includes a single rotating mirror or lens which deflects the optical pumping energy from the axis of rotation and into a plurality of distinct optical fibers each connected to a respective laser media or amplifier coupled to an associated combustion chamber. The laser spark generators preferably produce a high peak power laser spark, from a single low power pulse. The laser spark distribution and ignition system has application in natural gas fueled reciprocating engines, turbine combustors, explosives and laser induced breakdown spectroscopy diagnostic sensors.

  18. A Case Study on Distributed Antenna Systems

    DEFF Research Database (Denmark)

    Sørensen, Troels Bundgaard

    2007-01-01

    Passive distributed antenna systems (DASs) consisting of distributed feeder lines or single point antennas are now often installed in large office buildings where they provide efficient coverage throughout the building. More sophisticated DASs with intelligent reuse and the ability to adapt...... to changing interference and traffic conditions are less common, despite their potential for increased capacity in comparison with traditional (pico)cellular based concepts. This chapter explores a case study of one indoor environment where the site-specific propagation characteristics are taken into account...... is described in terms of algorithms for power allocation and access port assignment, as well as algorithms for (dynamic) channel assignment. After an outline of simulation assumptions, system capacity comparisons are given between the adaptive DAS and a system with fixed channel and access port assignment...

  19. Distributed parallel messaging for multiprocessor systems

    Science.gov (United States)

    Chen, Dong; Heidelberger, Philip; Salapura, Valentina; Senger, Robert M; Steinmacher-Burrow, Burhard; Sugawara, Yutaka

    2013-06-04

    A method and apparatus for distributed parallel messaging in a parallel computing system. The apparatus includes, at each node of a multiprocessor network, multiple injection messaging engine units and reception messaging engine units, each implementing a DMA engine and each supporting both multiple packet injection into and multiple reception from a network, in parallel. The reception side of the messaging unit (MU) includes a switch interface enabling writing of data of a packet received from the network to the memory system. The transmission side of the messaging unit, includes switch interface for reading from the memory system when injecting packets into the network.

  20. The message processing and distribution system development

    Science.gov (United States)

    Whitten, K. L.

    1981-06-01

    A historical approach is used in presenting the life cycle development of the Navy's message processing and distribution system beginning with the planning phase and ending with the integrated logistic support phase. Several maintenance problems which occurred after the system was accepted for fleet use were examined to determine if they resulted from errors in the acquisition process. The critical decision points of the acquisition process are examined and constructive recommendations are made for avoiding the problems which hindered the successful development of this system.

  1. Bolidozor - Distributed radio meteor detection system

    CERN Document Server

    Kakona, Jakub; Kakona, Martin

    2016-01-01

    Most of the meteor radioastronomical radars are backscatter radars which cover only a small area of the atmosphere. Therefore a daytime meteor flux models are based on sparse data collected by only a few radar systems. To solve this issue, a radar system with a wide coverage is required. We present a new approach of open-source multi-static radio meteor detection system which could be distributed over a large area. This feature allows us to detect meteor events taking place over a larger area as well and gather more uniform data about meteor flux and possibly about meteor trajectories.

  2. Design of Secure Distributed Intrusion Detection Systems

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Intrusion Detection System (IDS) have received a great deal of attention because of their excellent ability of preventing network incidents. Recently, many efficient approaches have been proposed to improve detection ability of IDS. While the self-protection ability of IDS is relatively worse and easy to be exploited by attackers, this paper gives a scheme of Securely Distributed Intrusion Detection System (SDIDS). This system adopts special measurements to enforce the security of IDS components. A new secure mechanism combining role-based access control and attribute certificate is used to resist attack to communication.

  3. New bus architecture for distributed avionic systems

    Energy Technology Data Exchange (ETDEWEB)

    Leonard, W.B.; Chow, K.K.

    1983-01-01

    The authors discuss a bus architecture which offers several advantages over conventional buses for a large selection of applications, and which allows for both interrupts and error checking. The bus may be expanded in the form of a tree with many processors, memories, and input/output devices distributed freely throughout the system. Therefore, it is inherently a multiprocessor bus and is well suited for systems in which a central controller controls several subordinate processors and devices. Its low overhead plus large capacity for expansion make it appropriate for a wide range of future systems.

  4. Power system operations: State estimation distributed processing

    Science.gov (United States)

    Ebrahimian, Mohammad Reza

    We present an application of a robust and fast parallel algorithm to power system state estimation with minimal amount of modifications to existing state estimators presently in place using the Auxiliary Problem Principle. We demonstrate its effectiveness on IEEE test systems, the Electric Reliability Counsel of Texas (ERCOT), and the Southwest Power Pool (SPP) systems. Since state estimation formulation may lead to an ill-conditioned system, we provide analytical explanations of the effects of mixtures of measurements on the condition of the state estimation information matrix. We demonstrate the closeness of the analytical equations to condition of several test case systems including IEEE RTS-96 and IEEE 118 bus systems. The research on the condition of the state estimation problem covers the centralized as well as distributed state estimation.

  5. Public Health Surveillance in Pilot Drinking Water Contamination Warning Systems

    Science.gov (United States)

    Dangel, Chrissy; Allgeier, Steven C.; Gibbons, Darcy; Haas, Adam

    2013-01-01

    allowed a cross-comparison to water pressure zones when attempting to locate the source of possible contamination. More specific location data (e.g., latitude and longitude) leads to a more efficient investigation, however, just narrowing the case location down to a specific hydraulic region within the water distribution system is extremely useful. Third, the ability to quickly visualize spatial distribution of cases via a visual interface was reported to be valuable to investigators during alert investigations. Most pilots implemented a CWS dashboard, in the form of a central graphical display, which presents the alerts and was used by the water utility and public health to obtain an understanding of geospatial relationships between cases, alerts and water pressure zones. Finally, public health and water utility representatives from several of the WSi pilots acknowledged that their automated surveillance tools currently have limited capabilities for detection of chemical contaminants (which may result in a sudden onset of symptoms), with the main deficiency being the timeliness of the alerts relative to the window of opportunity to respond in a meaningful and effective manner. While they currently focus on detection of traditional waterborne diseases, these tools could potentially be adapted to also detect chemical contaminants. Conclusions The results of the pilots have demonstrated that it is important to construct and formalize standard operating procedures, so that public health personnel and water utilities have a standard communication protocol. As a basic step to a PHS component, it is important to establish a relationship between utilities and public health. In addition to the efforts of the WSi pilots, research is currently being conducted by the U.S. EPA to analyze health seeking behavior of symptomatic individuals, because all PHS tools rely on data generated from behavior pursued by the affected population during a public health incident. Results from

  6. Risk classification and uncertainty propagation for virtual water distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Torres, Jacob M. [Department of Geography and Environmental Engineering, Johns Hopkins University, Baltimore, MD 21218 (United States)], E-mail: jato@jhu.edu; Brumbelow, Kelly [Zachry Department of Civil Engineering, Texas A and M University, College Station, TX 77843 (United States); Guikema, Seth D. [Department of Geography and Environmental Engineering, Johns Hopkins University, Baltimore, MD 21218 (United States)

    2009-08-15

    While the secrecy of real water distribution system data is crucial, it poses difficulty for research as results cannot be publicized. This data includes topological layouts of pipe networks, pump operation schedules, and water demands. Therefore, a library of virtual water distribution systems can be an important research tool for comparative development of analytical methods. A virtual city, 'Micropolis', has been developed, including a comprehensive water distribution system, as a first entry into such a library. This virtual city of 5000 residents is fully described in both geographic information systems (GIS) and EPANet hydraulic model frameworks. A risk classification scheme and Monte Carlo analysis are employed for an attempted water supply contamination attack. Model inputs to be considered include uncertainties in: daily water demand, seasonal demand, initial storage tank levels, the time of day a contamination event is initiated, duration of contamination event, and contaminant quantity. Findings show that reasonable uncertainties in model inputs produce high variability in exposure levels. It is also shown that exposure level distributions experience noticeable sensitivities to population clusters within the contaminant spread area. High uncertainties in exposure patterns lead to greater resources needed for more effective mitigation strategies.

  7. THE REFORM OF THE EUROPEAN PUBLIC PROCUREMENT SYSTEM

    Directory of Open Access Journals (Sweden)

    Daniela PIRVU

    2014-11-01

    Full Text Available The European public procurement system has a major role in ensuring the efficient spending of the public money and in promoting economic competitiveness. The legislative bases of the system are represented by harmonized European regulations, which aim to facilitate the application of the principles and freedoms enshrined in the EU Treaties. This paper presents the main aspects of the reform of the European public procurement system, aiming to make the procedures for awarding public contracts more transparent and open to all European companies and to streamline public spending for the procurement of goods, services and works.

  8. Reliability evaluation of distribution systems containing renewable distributed generations

    Science.gov (United States)

    Alkuhayli, Abdulaziz Abddullah

    Reliability evaluation of distribution networks, including islanded microgrid cases, is presented. The Monte Carlo simulation algorithm is applied to a test network. The network includes three types of distributed energy resources solar photovoltaic (PV), wind turbine (WT) and gas turbine (GT). These distributed generators contribute to supply part of the load during grid-connected mode, but supply the entire load during islanded microgrid operation. PV and WT stochastic models have been used to simulate the randomness of these resources. This study shows that the implementation of distributed generations can improve the reliability of the distribution networks.

  9. Energy storage system control strategies for power distribution systems

    Directory of Open Access Journals (Sweden)

    Areewan Kajorndech

    2015-03-01

    Full Text Available Energy storage systems have been widely employed to attain several benefits, such as reliability improvement, stabilization of power systems connected with renewable energy resources, economic benefits and etc. To achieve the above objectives, the appropriate and effective control strategies for energy storage systems are needed to be developed. This research proposes energy storage system control strategies for power distribution systems equipped with a limited size of energy storage system in order to improve reliability and save energy costs by determining an optimal charging schedule of the energy storage system. Simulation results demonstrate the benefits of energy storage system applications under the different control strategies.

  10. Information system for administrating and distributing color images through internet

    Directory of Open Access Journals (Sweden)

    2007-01-01

    Full Text Available The information system for administrating and distributing color images through the Internet ensures the consistent replication of color images, their storage - in an on-line data base - and predictable distribution, by means of a digitally distributed flow, based on Windows platform and POD (Print On Demand technology. The consistent replication of color images inde-pendently from the parameters of the processing equipment and from the features of the programs composing the technological flow, is ensured by the standard color management sys-tem defined by ICC (International Color Consortium, which is integrated by the Windows operation system and by the POD technology. The latter minimize the noticeable differences between the colors captured, displayed or printed by various replication equipments and/or edited by various graphical applications. The system integrated web application ensures the uploading of the color images in an on-line database and their administration and distribution among the users via the Internet. For the preservation of the data expressed by the color im-ages during their transfer along a digitally distributed flow, the software application includes an original tool ensuring the accurate replication of colors on computer displays or when printing them by means of various color printers or presses. For development and use, this application employs a hardware platform based on PC support and a competitive software platform, based on: the Windows operation system, the .NET. Development medium and the C# programming language. This information system is beneficial for creators and users of color images, the success of the printed or on-line (Internet publications depending on the sizeable, predictable and accurate replication of colors employed for the visual expression of information in every activity fields of the modern society. The herein introduced information system enables all interested persons to access the

  11. DDNFS: a Distributed Digital Notary File System

    Directory of Open Access Journals (Sweden)

    Alexander Zangerl

    2011-10-01

    Full Text Available Safeguarding online communications using public key cryptography is a well-establishedpractice today, but with the increasing reliance on “faceless”, solely online entities one of thecore aspects of public key cryptography is becoming a substantial problem in practice: Who canwe trust to introduce us to and vouch for some online party whose public key we see for the firsttime? Most existing certification models lack flexibility and have come under attack repeatedlyin recent years[1, 2], and finding practical improvements has a high priority.We propose that the real-world concept of a notary or certifying witness can be adapted totoday’s online environment quite easily, and that such a system when combined with peer-topeertechnologies for defense in depth is a viable alternative to monolithic trust infrastructures.Instead of trusting assurances from a single party, integrity certifications (and data replicationcan be provided among a group of independent parties in a peer-to-peer fashion. As thelikelihood of all such assurance providers being subverted at the very same time is very muchless than that of a single party, overall robustness is improved.This paper presents the design and the implementation of our prototype online notary systemwhere independent computer notaries provide integrity certification and highly-availablereplicated storage, and discusses how this online notary system handles some common threatpatterns.

  12. The Malaysian Public Procurement's Prevalent System and its Weaknesses

    Directory of Open Access Journals (Sweden)

    Rohana Othman

    2010-01-01

    Full Text Available Problem statement: This study examined the public procurement system as prevalent in the Malaysian government system of administration. Various aspects of public procurement are outlined including types and the processes that entail public procurement. This study also highlighted the weaknesses in the manual public procurement processes that are opened to potential abuse and mismanagement resulting in corruption. This study places the Malaysian Government public procurement system under the spotlight zeroing on allegations of abuse, tampering and corrupt practices. The study concluded that the large amount of funds allocated to public procurement coupled with excessive human intervention opportunities opened avenues that increase the risk of system abuse, profiteering and corruption. Case studies on the abuse and corruption of the public procurement system highlight the need for the Malaysian Government to eliminate the loopholes in the system, arrest the rot and implement a transparent, efficient and accountable public procurement system. Approach: Documents from the Ministry of Finance on public procurement including, among others, the Procurement Guideline Book, The Financial Procedures Act 1957, the Treasury Instructions (TI and the Treasury Circular Letter (TCL were scrutinized in studying the Malaysian Government public procurement system, its various attributes, types and processes that reflect a diversified approach to public procurement. Three case studies were cited to illustrate the susceptibility of the system to abuse and corruption. Results: Despite claims of openness and transparency of the public procurement system, it was found the current system is replete with the risk of abuse, unethical manipulations and corrupt practices. This research is limited to the analysis of data and processes related to the Malaysian Government public procurement system. The sensitivity of the subject may inhibit the collection of empirical data via

  13. A protocol for secure communication in large distributed systems

    Science.gov (United States)

    Anderson, D. P.; Ferrari, D.; Rangan, P. V.; Sartirana, B.

    1987-01-01

    A mechanism for secure communication in large distributed systems is proposed. The mechanism, called Authenticated Datagram Protocol (ADP), provides message authentication and, optionally, privacy of data. ADP is a host-to-host datagram protocol, positioned below the transport layer; it uses public-key encryption to establish secure channels between hosts and to authenticate owners, and single-key encryption for communication over a channel and to ensure privacy of the messages. ADP is shown to satisfy the main security requirements of large distributed systems, to provide end-to-end security in spite of its relatively low level, and to exhibit several advantages over schemes in which security mechanisms are at a higher level. The results of a trace-driven measurement study of ADP performance show that its throughput and latency are acceptable even within the limitations of today's technology, provided single-key encryption/decryption can be done in hardware.

  14. The CMS Timing Control and Distribution System

    CERN Document Server

    AUTHOR|(CDS)2075794; Andre, Jean-marc Olivier; Behrens, Ulf; Branson, James; Chaze, Olivier; Cittolin, Sergio; Darlea, Georgiana Lavinia; Deldicque, Christian; Demiragli, Zeynep; Dobson, Marc; Erhan, Samim; Fulcher, Jonathan Richard; Gigi, Dominique; Glege, Frank; Gomez Ceballos, Guillelmo; Hansen, Magnus; Holzner, Andre Georg; Jimenez Estupinan, Raul; Masetti, Lorenzo; Meijers, Franciscus; Meschi, Emilio; Mommsen, Remigius; Morovic, Srecko; O'Dell, Vivian; Orsini, Luciano; Paus, Christoph Maria Ernst; Pieri, Marco; Racz, Attila; Sakulin, Hannes; Schwick, Christoph; Simelevicius, Dainius; Troska, Jan; Vichoudis, Paschalis; Zejdl, Petr

    2016-01-01

    The Compact Muon Solenoid (CMS) experiment operating at the CERN (European Laboratory for Nuclear Physics) Large Hadron Collider (LHC) is in the process of upgrading several of its detector systems. Adding more individual detector components brings the need to test and commission those components separately from existing ones so as not to compromise physics data-taking. The CMS Trigger, Timing and Control (TTC) system had reached its limits in terms of the number of separate elements (partitions) that could be supported. A new Timing and Control Distribution System (TCDS) has been designed, built and commissioned in order to overcome this limit. It also brings additional functionality to facilitate parallel commissioning of new detector elements. We describe the new TCDS system and its components and show results from the first operational experience with the TCDS system in CMS.

  15. A system for distributed intrusion detection

    Energy Technology Data Exchange (ETDEWEB)

    Snapp, S.R.; Brentano, J.; Dias, G.V.; Goan, T.L.; Heberlein, L.T.; Ho, Che-Lin; Levitt, K.N.; Mukherjee, B. (California Univ., Davis, CA (USA). Div. of Computer Science); Grance, T. (Air Force Cryptologic Support Center, San Antonio, TX (USA)); Mansur, D.L.; Pon, K.L. (Lawrence Livermore National Lab., CA (USA)); Smaha, S.E. (Haystack Labs., Inc., Austin, TX (USA))

    1991-01-01

    The study of providing security in computer networks is a rapidly growing area of interest because the network is the medium over which most attacks or intrusions on computer systems are launched. One approach to solving this problem is the intrusion-detection concept, whose basic premise is that not only abandoning the existing and huge infrastructure of possibly-insecure computer and network systems is impossible, but also replacing them by totally-secure systems may not be feasible or cost effective. Previous work on intrusion-detection systems were performed on stand-alone hosts and on a broadcast local area network (LAN) environment. The focus of our present research is to extend our network intrusion-detection concept from the LAN environment to arbitarily wider areas with the network topology being arbitrary as well. The generalized distributed environment is heterogeneous, i.e., the network nodes can be hosts or servers from different vendors, or some of them could be LAN managers, like our previous work, a network security monitor (NSM), as well. The proposed architecture for this distributed intrusion-detection system consists of the following components: a host manager in each host; a LAN manager for monitoring each LAN in the system; and a central manager which is placed at a single secure location and which receives reports from various host and LAN managers to process these reports, correlate them, and detect intrusions. 11 refs., 2 figs.

  16. Intelligent System for Radial Distribution Load Flow

    Directory of Open Access Journals (Sweden)

    Vaishali Holkar

    2012-10-01

    Full Text Available This paper shows an application of Artificial Neural Networks (ANNs to determine the bus voltages and phase angles of a radial distribution system, without executing the complicated load flow algorithm, for any given load. The performance of the conventional load flow methods such as Newtoh-Raphson load flow, Fast decoupled load flow is found to be very poor under critical conditions such as high R/X ratio, heavily loading condition etc.To overcome the limitations of these regularly used methods a simple and reliable ladder iterative technique is used for solving the power balance equations of radial distribution system (RDS. The proposed method make use of a multi-layer feed forward ANN with error back propagation learning algorithm for calculation of bus voltages and its angles. A sample IEEE 33-bus is extensively tested with the proposed ANN based approach indicating its viability for RDS load flow assessment and results are presented.

  17. System Integration of Distributed Energy Resources

    DEFF Research Database (Denmark)

    Nyeng, Preben

    Besides their primary product – electricity – large central power stations supply socalled ancillary services that are necessary to maintain a secure and stable operation state of the electric power system. As the need for electricity from these units is being displaced by renewable energy sources...... units, including the ICT solutions that can facilitate the integration. Specifically, the international standard "IEC 61850-7-420 Communications systems for Distributed Energy Resources" is considered as a possible brick in the solution. This standard has undergone continuous development...... have been established. These models can be used for future investigations as well. A mixture of empirical and analytical methods have been used when defining the models and their parameters. The project concludes that distributed energy resources, including flexible demand, can contribute significantly...

  18. Robust Reconfiguration of A Distribution System

    Energy Technology Data Exchange (ETDEWEB)

    Moradzadeh, Benyamin [University of Tennessee, Knoxville (UTK); Tomsovic, Kevin [University of Tennessee, Knoxville (UTK)

    2017-01-01

    In this paper, a robust reconfiguration approach based on Mixed Integer Programming (MIP) is proposed to minimize loss in distribution systems. A Depth-First Search (DFS) algorithm to enumerate possible loops provides radiality constraint. This provides a general solution to the radiality constraint for distribution system reconfiguration/expansion problems. Still, imprecision and ambiguity in net loads, i.e. load minus renewable generation, due to lack of sufficient measurements and high utilization of demand response programs and renewable resources, creates challenges for effective reconfiguration. Deterministic optimization of reconfiguration may no lead to optimal/feasible results. Two methods to address these uncertainties are introduced in this paper: one, based on a stochastic MIP (SMIP) formulation and two, based on a fuzzy MIP (FMIP) formulation. Case studies demonstrate the robustness and efficiency of the proposed reconfiguration methods.

  19. 47 CFR 73.6023 - Distributed transmission systems.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 4 2010-10-01 2010-10-01 false Distributed transmission systems. 73.6023... distributed transmission system. ... RADIO BROADCAST SERVICES Class A Television Broadcast Stations § 73.6023 Distributed...

  20. The interrelations amongst control system elements in public sector organizations.

    NARCIS (Netherlands)

    Verbeeten, F.H.M.

    2013-01-01

    The aim of this study is to explain the decisions that public sector organizations make with regard to the design and use of their management control system. New Public Management, based on economics theory, suggests that employees in the public sector should be freed from traditional bureaucratic

  1. Nitrate, Nitrite, and Ammonium Variability in Drinking Water Distribution Systems.

    Science.gov (United States)

    Schullehner, Jörg; Stayner, Leslie; Hansen, Birgitte

    2017-03-09

    Accurate assessments of exposure to nitrate in drinking water is a crucial part of epidemiological studies investigating long-term adverse human health effects. However, since drinking water nitrate measurements are usually collected for regulatory purposes, assumptions on (1) the intra-distribution system variability and (2) short-term (seasonal) concentration variability have to be made. We assess concentration variability in the distribution system of nitrate, nitrite, and ammonium, and seasonal variability in all Danish public waterworks from 2007 to 2016. Nitrate concentrations at the exit of the waterworks are highly correlated with nitrate concentrations within the distribution net or at the consumers' taps, while nitrite and ammonium concentrations are generally lower within the net compared with the exit of the waterworks due to nitrification. However, nitrification of nitrite and ammonium in the distribution systems only results in a relatively small increase in nitrate concentrations. No seasonal variation for nitrate, nitrite, or ammonium was observed. We conclude that nitrate measurements taken at the exit of the waterworks are suitable to calculate exposures for all consumers connected to that waterworks and that sampling frequencies in the national monitoring programme are sufficient to describe temporal variations in longitudinal studies.

  2. An Educational Application of Distributed Measurement Systems

    Directory of Open Access Journals (Sweden)

    J. Saliga

    1999-06-01

    Full Text Available This paper describes an educational application of distributed measurement systems for the tutored and self-educational process that has been designed and applied at the Department of Electronics and Multimedial Telecommunications, Technical University of Kosice for students at the senior level of their study. The main goal of this activity has been to improve and spread our students' knowledge beyond the traditional university education in the area of measurement and communications. The students involved do not only play a passive role in the usage of a ready-made distributed measurement system by executing a remote measurement but they have the opportunity to participate in the process of design, carrying out and supervising an own simple distributed measurement system. To simplify their task, they may either use the graphical programming environment LabVIEW or the standard ANSI C language based on the programming environment Labwindows/CVI with ready-made instrument drivers (GPIB, serial and plug-in multifunction boards and basic software skeletons. The overview of the students' resources, task-solving steps and goals as well as the present results, experience and the expected future extensions are presented, too.

  3. Characteristics of Trihalomethanes in Water Distribution System

    Institute of Scientific and Technical Information of China (English)

    ZHAO Ming; ZHANG Jie; ZHANG Xin-yu; ZHENG Shuang-ying; LI Xin

    2008-01-01

    To investigate the characteristics of disinfection by-products (DBPs) in an actual water distribution system using the raw water with high bromide ion concentration, the composition and concentration of trihalomethanes (THMs) formed by chlorination of the water in the presence of bromide ion were measured in a city water distribution system during one year. The results show that brominated THMs contributed a great part (83%89%) to the index for additive toxicity (ATI) and resulted in the ATI of most of the samples exceeding WHO guideline standard for total THMs (TTHMs), especially during the summer (rainy season). This indicates that the chlorination of water in the presence of bromide ion leaded to high ratios of brominated THMs to TTHMs. However, a visible increase in the concentration of THMs with increasing residence time in the distribution system was not observed. Additionally, based on alternatives analysis, packed tower aeration method is proposed to reduce THMs level of the finished water leaving the treatment plant.

  4. Switching in electrical transmission and distribution systems

    CERN Document Server

    Smeets, René; Kapetanovic, Mirsad; Peelo, David F; Janssen, Anton

    2014-01-01

    Switching in Electrical Transmission and Distribution Systems presents the issues and technological solutions associated with switching in power systems, from medium to ultra-high voltage. The book systematically discusses the electrical aspects of switching, details the way load and fault currents are interrupted, the impact of fault currents, and compares switching equipment in particular circuit-breakers. The authors also explain all examples of practical switching phenomena by examining real measurements from switching tests. Other highlights include: up to date commentary on new develo

  5. Programming Model and Protocols for Reconfigurable Distributed Systems

    OpenAIRE

    Arad, Cosmin Ionel

    2013-01-01

    Distributed systems are everywhere. From large datacenters to mobile devices, an ever richer assortment of applications and services relies on distributed systems, infrastructure, and protocols. Despite their ubiquity, testing and debugging distributed systems remains notoriously hard. Moreover, aside from inherent design challenges posed by partial failure, concurrency, or asynchrony, there remain significant challenges in the implementation of distributed systems. These programming challeng...

  6. Distributed Control in Multi-Vehicle Systems

    Directory of Open Access Journals (Sweden)

    Paul A. Avery

    2013-12-01

    Full Text Available The Southwest Research Institute (SwRI Mobile Autonomous Robotics Technology Initiative (MARTI program has enabled the development of fully-autonomous passenger-sized commercial vehicles and military tactical vehicles, as well as the development of cooperative vehicle behaviors, such as cooperative sensor sharing and cooperative convoy operations. The program has also developed behaviors to interface intelligent vehicles with intelligent road-side devices. The development of intelligent vehicle behaviors cannot be approached as stand-alone phenomena; rather, they must be understood within a context of the broader traffic system dynamics. The study of other complex systems has shown that system-level behaviors emerge as a result of the spatio-temporal dynamics within a system's constituent parts. The design of such systems must therefore account for both the system-level emergent behavior, as well as behaviors of individuals within the system. It has also become clear over the past several years, for both of these domains, that human trust in the behavior of individual vehicles is paramount to broader technology adoption. This paper examines the interplay between individual vehicle capabilities, vehicle connectivity, and emergent system behaviors, and presents some considerations for a distributed control paradigm in a multi-vehicle system.

  7. Distributed Control in Multi-Vehicle Systems

    Directory of Open Access Journals (Sweden)

    Paul A. Avery

    2013-12-01

    Full Text Available The Southwest Research Institute (SwRI Mobile Autonomous Robotics Technology Initiative (MARTI program has enabled the development of fully-autonomous passenger-sized commercial vehicles and military tactical vehicles, as well as the development of cooperative vehicle behaviors, such as cooperative sensor sharing and cooperative convoy operations. The program has also developed behaviors to interface intelligent vehicles with intelligent road-side devices. The development of intelligent vehicle behaviors cannot be approached as stand-alone phenomena; rather, they must be understood within a context of the broader traffic system dynamics. The study of other complex systems has shown that system-level behaviors emerge as a result of the spatio-temporal dynamics within a system's constituent parts. The design of such systems must therefore account for both the system-level emergent behavior, as well as behaviors of individuals within the system. It has also become clear over the past several years, for both of these domains, that human trust in the behavior of individual vehicles is paramount to broader technology adoption. This paper examines the interplay between individual vehicle capabilities, vehicle connectivity, and emergent system behaviors, and presents some considerations for a distributed control paradigm in a multi-vehicle system.

  8. Public health system - current status and world experience

    Directory of Open Access Journals (Sweden)

    Andreyeva І.А.

    2016-09-01

    Full Text Available In the review, the evolution of Public Health and global development tendencies of Public Health system have been discussed. Stages of formation of the updated concept, principles of Public Health organization and the role of various organizations have been shown in the connection with development of the global concept of "Health for All". A well-functioning public health system is primarily the result of multisectoral cooperation. The aim of modern Public Health is to provide conditions of access to appropriate and cost-effective health care for all population groups, including health promotion and disease prevention.

  9. DDNFS: a Distributed Digital Notary File System

    CERN Document Server

    Zangerl, Alexander

    2011-01-01

    Safeguarding online communications using public key cryptography is a well-established practice today, but with the increasing reliance on `faceless', solely online entities one of the core aspects of public key cryptography is becoming a substantial problem in practice: Who can we trust to introduce us to and vouch for some online party whose public key we see for the first time? Most existing certification models lack flexibility and have come under attack repeatedly in recent years, and finding practical improvements has a high priority. We propose that the real-world concept of a notary or certifying witness can be adapted to today's online environment quite easily, and that such a system when combined with peer-to-peer technologies for defense in depth is a viable alternative to monolithic trust infrastructures. Instead of trusting assurances from a single party, integrity certifications (and data replication) can be provided among a group of independent parties in a peer-to-peer fashion. As the likeliho...

  10. Security of practical quantum key distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Jain, Nitin

    2015-02-24

    This thesis deals with practical security aspects of quantum key distribution (QKD) systems. At the heart of the theoretical model of any QKD system lies a quantum-mechanical security proof that guarantees perfect secrecy of messages - based on certain assumptions. However, in practice, deviations between the theoretical model and the physical implementation could be exploited by an attacker to break the security of the system. These deviations may arise from technical limitations and operational imperfections in the physical implementation and/or unrealistic assumptions and insufficient constraints in the theoretical model. In this thesis, we experimentally investigate in depth several such deviations. We demonstrate the resultant vulnerabilities via proof-of-principle attacks on a commercial QKD system from ID Quantique. We also propose countermeasures against the investigated loopholes to secure both existing and future QKD implementations.

  11. Contract models for public power distribution; Modeles de documents contractuels pour la distribution publique d'electricite

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-07-01

    This document gathers several models of contractual documents relative to the public distribution of electricity: grant conventions (for towns syndicate or for a single town), grant technical specifications (general dispositions, works relative to the granted network, services to users, tariffing, grant completion, various dispositions, local modalities between the granting authority and the grantee, third party participation to connection costs, electricity purchase and sale prices, general delivery conditions for low-power deliveries. (J.S.)

  12. Forms of contractual documents for public gas distribution; Modeles de documents contractuels pour la distribution publique de gaz

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-12-01

    This document is a compilation of standard forms of concession agreements and of specifications for public gas distribution (general dispositions, granted network and works, connection to the granted network, gas quality, contracts and conditions of supply, gas prices, concession end and control, various dispositions, agreement between the town and the grantee, calculation of profit rate, gas retail prices, general conditions of supply). (J.S.)

  13. States of Cybersecurity: Electricity Distribution System Discussions

    Energy Technology Data Exchange (ETDEWEB)

    Pena, Ivonne [National Renewable Energy Lab. (NREL), Golden, CO (United States); Ingram, Michael [National Renewable Energy Lab. (NREL), Golden, CO (United States); Martin, Maurice [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2017-03-16

    State and local entities that oversee the reliable, affordable provision of electricity are faced with growing and evolving threats from cybersecurity risks to our nation's electricity distribution system. All-hazards system resilience is a shared responsibility among electric utilities and their regulators or policy-setting boards of directors. Cybersecurity presents new challenges and should be a focus for states, local governments, and Native American tribes that are developing energy-assurance plans to protect critical infrastructure. This research sought to investigate the implementation of governance and policy at the distribution utility level that facilitates cybersecurity preparedness to inform the U.S. Department of Energy (DOE), Office of Energy Policy and Systems Analysis; states; local governments; and other stakeholders on the challenges, gaps, and opportunities that may exist for future analysis. The need is urgent to identify the challenges and inconsistencies in how cybersecurity practices are being applied across the United States to inform the development of best practices, mitigations, and future research and development investments in securing the electricity infrastructure. By examining the current practices and applications of cybersecurity preparedness, this report seeks to identify the challenges and persistent gaps between policy and execution and reflect the underlying motivations of distinct utility structures as they play out at the local level. This study aims to create an initial baseline of cybersecurity preparedness within the distribution electricity sector. The focus of this study is on distribution utilities not bound by the cybersecurity guidelines of the North American Electric Reliability Corporation (NERC) to examine the range of mechanisms taken by state regulators, city councils that own municipal utilities, and boards of directors of rural cooperatives.

  14. Global Distribution, Public Health and Clinical Impact of the Protozoan Pathogen Cryptosporidium

    Directory of Open Access Journals (Sweden)

    Lorenza Putignani

    2010-01-01

    Full Text Available Cryptosporidium spp. are coccidians, oocysts-forming apicomplexan protozoa, which complete their life cycle both in humans and animals, through zoonotic and anthroponotic transmission, causing cryptosporidiosis. The global burden of this disease is still underascertained, due to a conundrum transmission modality, only partially unveiled, and on a plethora of detection systems still inadequate or only partially applied for worldwide surveillance. In children, cryptosporidiosis encumber is even less recorded and often misidentified due to physiological reasons such as early-age unpaired immunological response. Furthermore, malnutrition in underdeveloped countries or clinical underestimation of protozoan etiology in developed countries contribute to the underestimation of the worldwide burden. Principal key indicators of the parasite distribution were associated to environmental (e.g., geographic and temporal clusters, etc. and host determinants of the infection (e.g., age, immunological status, travels, community behaviours. The distribution was geographically mapped to provide an updated picture of the global parasite ecosystems. The present paper aims to provide, by a critical analysis of existing literature, a link between observational epidemiological records and new insights on public health, and diagnostic and clinical impact of cryptosporidiosis.

  15. Understanding the organization of public health delivery systems: an empirical typology.

    Science.gov (United States)

    Mays, Glen P; Scutchfield, F Douglas; Bhandari, Michelyn W; Smith, Sharla A

    2010-03-01

    Policy discussions about improving the U.S. health care system increasingly recognize the need to strengthen its capacities for delivering public health services. A better understanding of how public health delivery systems are organized across the United States is critical to improvement. To facilitate the development of such evidence, this article presents an empirical method of classifying and comparing public health delivery systems based on key elements of their organizational structure. This analysis uses data collected through a national longitudinal survey of local public health agencies serving communities with at least 100,000 residents. The survey measured the availability of twenty core public health activities in local communities and the types of organizations contributing to each activity. Cluster analysis differentiated local delivery systems based on the scope of activities delivered, the range of organizations contributing, and the distribution of effort within the system. Public health delivery systems varied widely in organizational structure, but the observed patterns of variation suggested that systems adhere to one of seven distinct configurations. Systems frequently migrated from one configuration to another over time, with an overall trend toward offering a broader scope of services and engaging a wider range of organizations. Public health delivery systems exhibit important structural differences that may influence their operations and outcomes. The typology developed through this analysis can facilitate comparative studies to identify which delivery system configurations perform best in which contexts.

  16. FRIB Cryogenic Distribution System and Status

    Energy Technology Data Exchange (ETDEWEB)

    Ganni, Venkatarao [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Dixon, Kelly D. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Laverdure, Nathaniel A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Yang, Shuo [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Nellis, Timothy [Michigan State Univ., East Lansing, MI (United States); Jones, S. [Michigan State Univ., East Lansing, MI (United States); Casagrande, Fabio [Michigan State Univ., East Lansing, MI (United States)

    2015-12-01

    The MSU-FRIB cryogenic distribution system supports the 2 K primary, 4 K primary, and 35 - 55 K shield operation of more than 70 loads in the accelerator and the experimental areas. It is based on JLab and SNS experience with bayonet-type disconnects between the loads and the distribution system for phased commissioning and maintenance. The linac transfer line, which features three separate transfer line segments for additional independence during phased commissioning at 4 K and 2 K, connects the folded arrangement of 49 cryomodules and 4 superconducting dipole magnets and a fourth transfer line supports the separator area cryo loads. The pressure reliefs for the transfer line process lines, located in the refrigeration room outside the tunnel/accelerator area, are piped to be vented outdoors. The transfer line designs integrate supply and return flow paths into a combined vacuum space. The main linac distribution segments are produced in a small number of standard configurations; a prototype of one such configuration has been fabricated at Jefferson Lab and has been installed at MSU to support testing of a prototype FRIB cryomodule.

  17. Intelligent Control and Operation of Distribution System

    DEFF Research Database (Denmark)

    Bhattarai, Bishnu Prasad

    to be implemented with the existing technology. One of the potential alternatives is to intelligently control the electrical loads to make them follow the intermittent generation. This not only enables the end consumers to get reliable and cheap electricity but also enables the utility to prevent huge investment...... in counterpart. Therefore, the theoretical foundation of this research work is based on a paradigm shift in ‘generation following demand’ to ‘demand following generation’ scenario. The primary aim of this research work is to develop intelligent control architecture, control strategies, and an adaptive protection...... in this direction but also benefit distribution system operators in the planning and development of the distribution network. The major contributions of this work are described in the following four stages: In the first stage, an intelligent Demand Response (DR) control architecture is developed for coordinating...

  18. LHCb: Monitoring the DIRAC Distribution System

    CERN Multimedia

    Nandakumar, R; Santinelli, R

    2009-01-01

    DIRAC is the LHCb gateway to any computing grid infrastructure (currently supporting WLCG) and is intended to reliably run large data mining activities. The DIRAC system consists of various services (which wait to be contacted to perform actions) and agents (which carry out periodic activities) to direct jobs as required. An important part of ensuring the reliability of the infrastructure is the monitoring and logging of these DIRAC distributed systems. The monitoring is done collecting information from two sources - one is from pinging the services or by keeping track of the regular heartbeats of the agents, and the other from the analysis of the error messages generated by both agents and services and collected by the logging system. This allows us to ensure that he components are running properly and to collect useful information regarding their operations. The process status monitoring is displayed using the SLS sensor mechanism which also automatically allows one to plot various quantities and also keep ...

  19. Optimal control of nonsmooth distributed parameter systems

    CERN Document Server

    Tiba, Dan

    1990-01-01

    The book is devoted to the study of distributed control problems governed by various nonsmooth state systems. The main questions investigated include: existence of optimal pairs, first order optimality conditions, state-constrained systems, approximation and discretization, bang-bang and regularity properties for optimal control. In order to give the reader a better overview of the domain, several sections deal with topics that do not enter directly into the announced subject: boundary control, delay differential equations. In a subject still actively developing, the methods can be more important than the results and these include: adapted penalization techniques, the singular control systems approach, the variational inequality method, the Ekeland variational principle. Some prerequisites relating to convex analysis, nonlinear operators and partial differential equations are collected in the first chapter or are supplied appropriately in the text. The monograph is intended for graduate students and for resea...

  20. Next Generation Multimedia Distributed Data Base Systems

    Science.gov (United States)

    Pendleton, Stuart E.

    1997-01-01

    The paradigm of client/server computing is changing. The model of a server running a monolithic application and supporting clients at the desktop is giving way to a different model that blurs the line between client and server. We are on the verge of plunging into the next generation of computing technology--distributed object-oriented computing. This is not only a change in requirements but a change in opportunities, and requires a new way of thinking for Information System (IS) developers. The information system demands caused by global competition are requiring even more access to decision making tools. Simply, object-oriented technology has been developed to supersede the current design process of information systems which is not capable of handling next generation multimedia.

  1. The Adaptation of Ways and Methods of Risk Minimization in Local Payment Systems in Public Transport

    Directory of Open Access Journals (Sweden)

    Avdaev Mausar Yushaevich

    2014-12-01

    Full Text Available The problems of risk management gain special relevance in the conditions of payment systems development in public passenger transport in Russia. The risk carriers as well as the sources of their occurrence are revealed; the characteristics of private risks of individual participants in the system of public passenger transport are presented. The directions of risk management in relation to the payment system in public transport are reasoned and structured. It is proved that the choice of specific ways to minimize the risks in local payment systems in public transport is conditioned by the following factors – the nature of the payment system integration in public transport areas, the temporary nature of risk components effect due to the improvement of organizational, economic and technological factors, the change of the stages of payment systems development, the evaluation of risks effects. The article reasons the possibility of using and adjusting traditional ways (risk evasion, risk compensation, decrease in risk level, risk transfer, distribution of risk between participants and the methods of risk management in the payment systems in public transport according to the stages of their development and functioning for the processing center, passenger motor transport organizations, financial center and passengers (payers. The authors justify the directions of integrating the local payment systems of public transport in the national payment system, taking into account the risks involved in the activity of its members.

  2. Publications and the peer review system

    Science.gov (United States)

    The peer review process as it relates to scientific publications in entomological journals is facing a number of serious issues that must be addressed. Among those issues are the increasing submissions from international authors writing in English as a second or third language, manuscripts lacking s...

  3. Securing military information systems on public infrastructure

    CSIR Research Space (South Africa)

    Botha, P

    2015-03-01

    Full Text Available Military information systems require high levels of security to protect sensitive information within these systems. Encrypted private networks are a common method of securing such systems. However these networks are not always available or practical...

  4. Distributed design approach in persistent identifiers systems

    Science.gov (United States)

    Golodoniuc, Pavel; Car, Nicholas; Klump, Jens

    2017-04-01

    The need to identify both digital and physical objects is ubiquitous in our society. Past and present persistent identifier (PID) systems, of which there is a great variety in terms of technical and social implementations, have evolved with the advent of the Internet, which has allowed for globally unique and globally resolvable identifiers. PID systems have catered for identifier uniqueness, integrity, persistence, and trustworthiness, regardless of the identifier's application domain, the scope of which has expanded significantly in the past two decades. Since many PID systems have been largely conceived and developed by small communities, or even a single organisation, they have faced challenges in gaining widespread adoption and, most importantly, the ability to survive change of technology. This has left a legacy of identifiers that still exist and are being used but which have lost their resolution service. We believe that one of the causes of once successful PID systems fading is their reliance on a centralised technical infrastructure or a governing authority. Golodoniuc et al. (2016) proposed an approach to the development of PID systems that combines the use of (a) the Handle system, as a distributed system for the registration and first-degree resolution of persistent identifiers, and (b) the PID Service (Golodoniuc et al., 2015), to enable fine-grained resolution to different information object representations. The proposed approach solved the problem of guaranteed first-degree resolution of identifiers, but left fine-grained resolution and information delivery under the control of a single authoritative source, posing risk to the long-term availability of information resources. Herein, we develop these approaches further and explore the potential of large-scale decentralisation at all levels: (i) persistent identifiers and information resources registration; (ii) identifier resolution; and (iii) data delivery. To achieve large-scale decentralisation

  5. Hot Water Distribution System Model Enhancements

    Energy Technology Data Exchange (ETDEWEB)

    Hoeschele, M. [Alliance for Residential Building Innovation (ARBI), Davis, CA (United States); Weitzel, E. [Alliance for Residential Building Innovation (ARBI), Davis, CA (United States)

    2012-11-01

    This project involves enhancement of the HWSIM distribution system model to more accurately model pipe heat transfer. Recent laboratory testing efforts have indicated that the modeling of radiant heat transfer effects is needed to accurately characterize piping heat loss. An analytical methodology for integrating radiant heat transfer was implemented with HWSIM. Laboratory test data collected in another project was then used to validate the model for a variety of uninsulated and insulated pipe cases (copper, PEX, and CPVC). Results appear favorable, with typical deviations from lab results less than 8%.

  6. Distributed Power-Generation Systems and Protection

    DEFF Research Database (Denmark)

    Blaabjerg, Frede; Yang, Yongheng; Yang, Dongsheng

    2017-01-01

    penetration degree of renewable energy, among which wind and solar photovoltaics are typical sources. The integration level of the DPGS into the grid plays a critical role in developing sustainable and resilient power systems, especially with highly intermittent renewable energy resources. To address...... for the DPGS to consolidate the integration. In light of the above, this paper reviews the power-conversion and control technologies used for DPGSs. The impacts of the DPGS on the distributed grid are also examined, and more importantly, strategies for enhancing the connection and protection of the DPGS...

  7. temperature distribution in underground cable system

    Directory of Open Access Journals (Sweden)

    Rerak Monika

    2017-01-01

    Full Text Available The paper presents a mathematical model of heat transfer in the underground cable system. The computations were performed for flat formation of power cables buried in the ground at a depth of 2 meters. The model allows determining the two-dimensional temperature distribution in the soil, thermal backfill and power cables. The simulations studied the effect of soil thermal conductivity on the maximum temperature of the cable conductor. Furthermore, the effect of thermal backfill soil conductivity on the cable conductor temperature was studied. Numerical analyses were performed based on a program written in MATLAB.

  8. On Locality in Distributed Storage Systems

    CERN Document Server

    Rawat, Ankit Singh

    2012-01-01

    This paper studies the design of codes for distributed storage systems (DSS) that enable local repair in the event of node failure. This paper presents locally repairable codes based on low degree multivariate polynomials. Its code construction mechanism extends work on Noisy Interpolating Set by Dvir et al. \\cite{dvir2011}. The paper presents two classes of codes that allow node repair to be performed by contacting 2 and 3 surviving nodes respectively. It further shows that both classes are good in terms of their rate and minimum distance, and allow their rate to be bartered for greater flexibility in the repair process.

  9. Storage and distribution system for multimedia information

    Science.gov (United States)

    Murakami, Tokumichi

    1994-06-01

    Recent advances in technologies such as digital signal processing, LSI devices and storage media have led to an explosive growth in multimedia environment. Multimedia information services are expected to provide an information-oriented infrastructure which will integrate visual communication, broadcasting and computer services. International standardizations in video/audio coding accelerate permeation of these services into society. In this paper, from trends of R & D and international standardization in video coding techniques, an outline is given of a storage and distribution system for multimedia information, and a summary of the requirements of digital storage media.

  10. Analysis and control of distributed cooperative systems.

    Energy Technology Data Exchange (ETDEWEB)

    Feddema, John Todd; Parker, Eric Paul; Wagner, John S.; Schoenwald, David Alan

    2004-09-01

    As part of DARPA Information Processing Technology Office (IPTO) Software for Distributed Robotics (SDR) Program, Sandia National Laboratories has developed analysis and control software for coordinating tens to thousands of autonomous cooperative robotic agents (primarily unmanned ground vehicles) performing military operations such as reconnaissance, surveillance and target acquisition; countermine and explosive ordnance disposal; force protection and physical security; and logistics support. Due to the nature of these applications, the control techniques must be distributed, and they must not rely on high bandwidth communication between agents. At the same time, a single soldier must easily direct these large-scale systems. Finally, the control techniques must be provably convergent so as not to cause undo harm to civilians. In this project, provably convergent, moderate communication bandwidth, distributed control algorithms have been developed that can be regulated by a single soldier. We have simulated in great detail the control of low numbers of vehicles (up to 20) navigating throughout a building, and we have simulated in lesser detail the control of larger numbers of vehicles (up to 1000) trying to locate several targets in a large outdoor facility. Finally, we have experimentally validated the resulting control algorithms on smaller numbers of autonomous vehicles.

  11. Physical Effects of Distributed PV Generation on California's Distribution System

    CERN Document Server

    Cohen, Michael A

    2015-01-01

    Deployment of high-penetration photovoltaic (PV) power is expected to have a range of effects -- both positive and negative -- on the distribution grid. The magnitude of these effects may vary greatly depending upon feeder topology, climate, PV penetration level, and other factors. In this paper we present a simulation study of eight representative distribution feeders in three California climates at PV penetration levels up to 100\\%, supported by a unique database of distributed PV generation data that enables us to capture the impact of PV variability on feeder voltage and voltage regulating equipment. When comparing the influence of feeder location (i.e. climate) versus feeder type on outcomes, we find that location more strongly influences the incidence of reverse power flow, reductions in peak loading and the presence of voltage excursions. On the other hand, we find that feeder characteristics more strongly influence the magnitude of loss reduction and changes in voltage regulator operations. We find th...

  12. Distributed Adaptive Droop Control for DC Distribution Systems

    DEFF Research Database (Denmark)

    Nasirian, Vahidreza; Davoudi, Ali; Lewis, Frank

    2014-01-01

    A distributed-adaptive droop mechanism is proposed for secondary/primary control of dc Microgrids. The conventional secondary control, that adjusts the voltage set point for the local droop mechanism, is replaced by a voltage regulator. A current regulator is then added to fine-tune the droop...... controller precisely accounts for the transmission/distribution line impedances. The controller on each converter exchanges data with only its neighbor converters on a sparse communication graph spanned across the Microgrid. Global dynamic model of the Microgrid is derived, with the proposed controller...

  13. Distributed adaptive droop control for DC distribution systems

    DEFF Research Database (Denmark)

    Nasirian, Vahidreza; Davoudi, Ali; Lewis, Frank

    2016-01-01

    Summary form only given: A distributed-adaptive droop mechanism is proposed for secondary/primary control of dc microgrids. The conventional secondary control that adjusts the voltage set point for the local droop mechanism is replaced by a voltage regulator. A current regulator is also added...... sharing. The proposed controller precisely accounts for the transmission/distribution line impedances. The controller on each converter exchanges data with only its neighbor converters on a sparse communication graph spanned across the microgrid. Global dynamic model of the microgrid is derived...

  14. Global resilience analysis of water distribution systems.

    Science.gov (United States)

    Diao, Kegong; Sweetapple, Chris; Farmani, Raziyeh; Fu, Guangtao; Ward, Sarah; Butler, David

    2016-12-01

    Evaluating and enhancing resilience in water infrastructure is a crucial step towards more sustainable urban water management. As a prerequisite to enhancing resilience, a detailed understanding is required of the inherent resilience of the underlying system. Differing from traditional risk analysis, here we propose a global resilience analysis (GRA) approach that shifts the objective from analysing multiple and unknown threats to analysing the more identifiable and measurable system responses to extreme conditions, i.e. potential failure modes. GRA aims to evaluate a system's resilience to a possible failure mode regardless of the causal threat(s) (known or unknown, external or internal). The method is applied to test the resilience of four water distribution systems (WDSs) with various features to three typical failure modes (pipe failure, excess demand, and substance intrusion). The study reveals GRA provides an overview of a water system's resilience to various failure modes. For each failure mode, it identifies the range of corresponding failure impacts and reveals extreme scenarios (e.g. the complete loss of water supply with only 5% pipe failure, or still meeting 80% of demand despite over 70% of pipes failing). GRA also reveals that increased resilience to one failure mode may decrease resilience to another and increasing system capacity may delay the system's recovery in some situations. It is also shown that selecting an appropriate level of detail for hydraulic models is of great importance in resilience analysis. The method can be used as a comprehensive diagnostic framework to evaluate a range of interventions for improving system resilience in future studies.

  15. Distributed intelligence for ground/space systems

    Science.gov (United States)

    Aarup, Mads; Munch, Klaus Heje; Fuchs, Joachim; Hartmann, Ralf; Baud, Tim

    1994-01-01

    DI is short for Distributed Intelligence for Ground/Space Systems and the DI Study is one in a series of ESA projects concerned with the development of new concepts and architectures for future autonomous spacecraft systems. The kick-off of DI was in January 1994 and the planned duration is three years. The background of DI is the desire to design future ground/space systems with a higher degree of autonomy than seen in today's missions. The aim of introducing autonomy in spacecraft systems is to: (1) lift the role of the spacecraft operators from routine work and basic troubleshooting to supervision; (2) ease access to and increase availability of spacecraft resources; (3) carry out basic mission planning for users; (4) enable missions which have not yet been feasible due to eg. propagation delays, insufficient ground station coverage etc.; and (5) possibly reduce mission cost. The study serves to identify the feasibility of using state-of-the-art technologies in the area of planning, scheduling, fault detection using model-based diagnosis and knowledge processing to obtain a higher level of autonomy in ground/space systems.

  16. On the controllability of distributed systems.

    Science.gov (United States)

    Lions, J L

    1997-05-13

    To "control" a system is to make it behave (hopefully) according to our "wishes," in a way compatible with safety and ethics, at the least possible cost. The systems considered here are distributed-i.e., governed (modeled) by partial differential equations (PDEs) of evolution. Our "wish" is to drive the system in a given time, by an adequate choice of the controls, from a given initial state to a final given state, which is the target. If this can be achieved (respectively, if we can reach any "neighborhood" of the target) the system, with the controls at our disposal, is exactly (respectively, approximately) controllable. A very general (and fuzzy) idea is that the more a system is "unstable" (chaotic, turbulent) the "simplest," or the "cheapest," it is to achieve exact or approximate controllability. When the PDEs are the Navier-Stokes equations, it leads to conjectures, which are presented and explained. Recent results, reported in this expository paper, essentially prove the conjectures in two space dimensions. In three space dimensions, a large number of new questions arise, some new results support (without proving) the conjectures, such as generic controllability and cases of decrease of cost of control when the instability increases. Short comments are made on models arising in climatology, thermoelasticity, non-Newtonian fluids, and molecular chemistry. The Introduction of the paper and the first part of all sections are not technical. Many open questions are mentioned in the text.

  17. Dynamics and distribution of public and private research and extension roles for technological innovation and diffusion

    NARCIS (Netherlands)

    Eastwood, C.; Klerkx, L.; Nettle, R.

    2017-01-01

    Precision farming technologies represent an innovation challenge in terms of their diffusion into farming practice, and create a new dynamic for research and extension roles. The purpose of this paper is to examine the interaction and distribution of research and extension roles of public, private,

  18. The Distribution of Mexico's Public Spending on Education. Policy Research Working Paper.

    Science.gov (United States)

    Lopez-Acevedo, Gladys; Salinas, Angel

    Research has shown that education in Mexico has played a crucial role in the process of earnings formation and that returns to education have increased only in the higher levels of education and in the upper tail of the conditional earnings distribution. This paper examines the public educational expenditure patterns in the face of possible…

  19. Distributed Robust Power System State Estimation

    CERN Document Server

    Kekatos, Vassilis

    2012-01-01

    Deregulation of energy markets, penetration of renewables, advanced metering capabilities, and the urge for situational awareness, all call for system-wide power system state estimation (PSSE). Implementing a centralized estimator though is practically infeasible due to the complexity scale of an interconnection, the communication bottleneck in real-time monitoring, regional disclosure policies, and reliability issues. In this context, distributed PSSE methods are treated here under a unified and systematic framework. A novel algorithm is developed based on the alternating direction method of multipliers. It leverages existing PSSE solvers, respects privacy policies, exhibits low communication load, and its convergence to the centralized estimates is guaranteed even in the absence of local observability. Beyond the conventional least-squares based PSSE, the decentralized framework accommodates a robust state estimator. By exploiting interesting links to the compressive sampling advances, the latter jointly es...

  20. Distribution in flowing reaction-diffusion systems

    KAUST Repository

    Kamimura, Atsushi

    2009-12-28

    A power-law distribution is found in the density profile of reacting systems A+B→C+D and 2A→2C under a flow in two and three dimensions. Different densities of reactants A and B are fixed at both ends. For the reaction A+B, the concentration of reactants asymptotically decay in space as x-1/2 and x-3/4 in two dimensions and three dimensions, respectively. For 2A, it decays as log (x) /x in two dimensions. The decay of A+B is explained considering the effect of segregation of reactants in the isotropic case. The decay for 2A is explained by the marginal behavior of two-dimensional diffusion. A logarithmic divergence of the diffusion constant with system size is found in two dimensions. © 2009 The American Physical Society.

  1. Managing complex systems: performance management in public health.

    Science.gov (United States)

    Landrum, Laura B; Baker, Stacy L

    2004-01-01

    The complexity of mobilizing and managing systems-wide public health responses has prompted Turning Point's Performance Management National Excellence Collaborative, funded by the Robert Wood Johnson Foundation, to develop a conceptual framework for performance management in public health. The framework has four integrated parts: (1) performance standards, (2) performance measures, (3) reporting of progress, and (4) a quality improvement process. The Collaborative based its framework on evidence gathered through a survey of current state performance management practices, a literature review, and its investigation of current practice models. This balanced and cohesive management model can be constructively used by public health programs, organizations, and community and state public health systems.

  2. Manganese deposition in drinking water distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Gerke, Tammie L., E-mail: Tammie.Gerke@miamioh.edu [Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013 (United States); Little, Brenda J., E-mail: brenda.little@nrlssc.navy.mil [Naval Research Laboratory, Stennis Space Center, MS 39529 (United States); Barry Maynard, J., E-mail: maynarjb@ucmail.uc.edu [Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013 (United States)

    2016-01-15

    This study provides a physicochemical assessment of manganese deposits on brass and lead components from two fully operational drinking water distributions systems. One of the systems was maintained with chlorine; the other, with secondary chloramine disinfection. Synchrotron-based in-situ micro X-ray adsorption near edge structure was used to assess the mineralogy. In-situ micro X-ray fluorescence mapping was used to demonstrate the spatial relationships between manganese and potentially toxic adsorbed metal ions. The Mn deposits ranged in thickness from 0.01 to 400 μm. They were composed primarily of Mn oxides/oxhydroxides, birnessite (Mn{sup 3+} and Mn{sup 4+}) and hollandite (Mn{sup 2+} and Mn{sup 4+}), and a Mn silicate, braunite (Mn{sup 2+} and Mn{sup 4+}), in varying proportions. Iron, chromium, and strontium, in addition to the alloying elements lead and copper, were co-located within manganese deposits. With the exception of iron, all are related to specific health issues and are of concern to the U.S. Environmental Protection Agency (U.S. EPA). The specific properties of Mn deposits, i.e., adsorption of metals ions, oxidation of metal ions and resuspension are discussed with respect to their influence on drinking water quality. - Highlights: • Oxidation and deposition of Mn deposits in drinking water distribution pipes • In-situ synchrotron-based μ-XANES and μ-XRF mapping • Toxic metal sorption in Mn deposits.

  3. Function Analyses of Geographic Information System on Rural Distribution Network

    Institute of Scientific and Technical Information of China (English)

    FANG Junlong; FAN Yongcun; ZHANG Chunmei; GU Shumin

    2006-01-01

    With the actuality and characteristic and requirement of rural power enterprise distribution network management, this article introduced the function of geographic information system on the framework of distribution network, in order to develop rural distribution network.

  4. Detecting and correcting for publication bias in meta-analysis - A truncated normal distribution approach.

    Science.gov (United States)

    Zhu, Qiaohao; Carriere, K C

    2016-01-01

    Publication bias can significantly limit the validity of meta-analysis when trying to draw conclusion about a research question from independent studies. Most research on detection and correction for publication bias in meta-analysis focus mainly on funnel plot-based methodologies or selection models. In this paper, we formulate publication bias as a truncated distribution problem, and propose new parametric solutions. We develop methodologies of estimating the underlying overall effect size and the severity of publication bias. We distinguish the two major situations, in which publication bias may be induced by: (1) small effect size or (2) large p-value. We consider both fixed and random effects models, and derive estimators for the overall mean and the truncation proportion. These estimators will be obtained using maximum likelihood estimation and method of moments under fixed- and random-effects models, respectively. We carried out extensive simulation studies to evaluate the performance of our methodology, and to compare with the non-parametric Trim and Fill method based on funnel plot. We find that our methods based on truncated normal distribution perform consistently well, both in detecting and correcting publication bias under various situations.

  5. Public Transport Information System for Visually Impaired and Blind People

    Science.gov (United States)

    Markiewicz, Michał; Skomorowski, Marek

    This paper presents an assistive system for the visually impaired and blind people which helps them using public transport means. The proposed system uses mobile phones as a medium for passenger information system and GPS (Global Positioning System), GSM (Global System for Mobile Communications) and Bluetooth technologies for location and communication purposes. In the proposed system sound messages are given to the blind people via mobile phones which have dedicated software installed. This system has been implemented and tested in public transport in two pilot cities.

  6. The Political System. SSEC Publication No. 103.

    Science.gov (United States)

    Collier, David

    The systems analysis of political life might be used as a basis for teaching about the political process in all grades, including elementary school. A political system is part of an intra-societal environment including ecological, biological, personality, economic, cultural, and other systems, all operating in society and bound by an…

  7. 46 CFR 120.376 - Grounded distribution systems (Neutral grounded).

    Science.gov (United States)

    2010-10-01

    ... ELECTRICAL INSTALLATION Power Sources and Distribution Systems § 120.376 Grounded distribution systems... distribution system having a neutral bus or conductor must have the neutral grounded. (c) The neutral or each... generator is connected to the bus, except the neutral of an emergency power generation system must...

  8. Design a Fault Tolerance for Real Time Distributed System

    OpenAIRE

    Ban M. Khammas

    2012-01-01

    This paper designed a fault tolerance for soft real time distributed system (FTRTDS). This system is designed to be independently on specific mechanisms and facilities of the underlying real time distributed system. It is designed to be distributed on all the computers in the distributed system and controlled by a central unit.Besides gathering information about a target program spontaneously, it provides information about the target operating system and the target hardware in order to diagno...

  9. Implementation of Data Integration using Distributed Systems: A Review

    OpenAIRE

    Rakesh Jaitly

    2011-01-01

    Data integration in the distributed data system is introduced to solve the problem that data model has. The data integration in the distributional systems can be supported effectively. Data conversion is still a challenge in distributed system integration.Community based system is used for distributed data integration. It comprises of three elements: community, data model and communication protocol. The integration system solves the data heterogeneous problem in production management, making ...

  10. MDSplus automated build and distribution system

    Energy Technology Data Exchange (ETDEWEB)

    Fredian, T., E-mail: twf@psfc.mit.edu [Massachusetts Institute of Technology, 175 Albany Street, Cambridge, MA 02139 (United States); Stillerman, J. [Massachusetts Institute of Technology, 175 Albany Street, Cambridge, MA 02139 (United States); Manduchi, G. [Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti 4, Padova 35127 (Italy)

    2014-05-15

    Support of the MDSplus data handling system has been enhanced by the addition of an automated build system which does nightly builds of MDSplus for many computer platforms producing software packages which can now be downloaded using a web browser or via package repositories suitable for automatic updating. The build system was implemented using an extensible continuous integration server product called Hudson which schedules software builds on a collection of VMware based virtual machines. New releases are created based on updates via the MDSplus cvs code repository and versioning are managed using cvs tags and branches. Currently stable, beta and alpha releases of MDSplus are maintained for eleven different platforms including Windows, MacOSX, RedHat Enterprise Linux, Fedora, Ubuntu and Solaris. For some of these platforms, MDSplus packaging has been broken into functional modules so users can pick and choose which MDSplus features they want to install. An added feature to the latest Linux based platforms is the use of package dependencies. When installing MDSplus from the package repositories, any additional required packages used by MDSplus will be installed automatically greatly simplifying the installation of MDSplus. This paper will describe the MDSplus package automated build and distribution system.

  11. Waiting time distribution for continuous stochastic systems.

    Science.gov (United States)

    Gernert, Robert; Emary, Clive; Klapp, Sabine H L

    2014-12-01

    The waiting time distribution (WTD) is a common tool for analyzing discrete stochastic processes in classical and quantum systems. However, there are many physical examples where the dynamics is continuous and only approximately discrete, or where it is favourable to discuss the dynamics on a discretized and a continuous level in parallel. An example is the hindered motion of particles through potential landscapes with barriers. In the present paper we propose a consistent generalization of the WTD from the discrete case to situations where the particles perform continuous barrier crossing characterized by a finite duration. To this end, we introduce a recipe to calculate the WTD from the Fokker-Planck (Smoluchowski) equation. In contrast to the closely related first passage time distribution (FPTD), which is frequently used to describe continuous processes, the WTD contains information about the direction of motion. As an application, we consider the paradigmatic example of an overdamped particle diffusing through a washboard potential. To verify the approach and to elucidate its numerical implications, we compare the WTD defined via the Smoluchowski equation with data from direct simulation of the underlying Langevin equation and find full consistency provided that the jumps in the Langevin approach are defined properly. Moreover, for sufficiently large energy barriers, the WTD defined via the Smoluchowski equation becomes consistent with that resulting from the analytical solution of a (two-state) master equation model for the short-time dynamics developed previously by us [Phys. Rev. E 86, 061135 (2012)]. Thus, our approach "interpolates" between these two types of stochastic motion. We illustrate our approach for both symmetric systems and systems under constant force.

  12. Voltage regulation and reactive power supply capability of distributed generation : applications in active distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Katiraei, F.; Yazdani, A.; Uluski, R. [Quanta Technology, New York, NY (United States); Vaziri, M. [Pacific Gas and Electric Co., San Fransisco, CA (United States)

    2009-07-01

    Problems regarding voltage regulation on distribution feeders arise when there is a large demand for reactive power. The addition of distributed generation changes the power flow and voltage profile of a power system. The current practice is to use distributed generation passively and perform voltage regulation as before. However, this may not function well with high distributed generation penetration. This presentation discussed voltage regulation and the reactive power supply capability of distributed generation. Several applications in active distribution systems were presented. Specifically, the presentation discussed distributed interconnection challenges; utility practices and limiting factors; and the real and reactive power capabilities of distributed generation. A case study was also presented. It was concluded that in order for distributed generation to actively participate in real and reactive power management of distribution systems, a change is needed in standards and utility guidelines, along with a better understanding of distributed generation technologies and controls. 1 tab., 11 figs.

  13. Distributed Sensor Coordination for Advanced Energy Systems

    Energy Technology Data Exchange (ETDEWEB)

    Tumer, Kagan

    2013-07-31

    the focus towards “what to observe” rather than “how to observe” in large sensor networks, allowing the agents to actively determine both the structure of the network and the relevance of the information they are seeking to collect. In addition to providing an implicit coordination mechanism, this approach allows the system to be reconfigured in response to changing needs (e.g., sudden external events requiring new responses) or changing sensor network characteristics (e.g., sudden changes to plant condition). Outcome Summary: All milestones associated with this project have been completed. In particular, private sensor objective functions were developed which are aligned with the global objective function, sensor effectiveness has been improved by using “sensor teams,” system efficiency has been improved by 30% using difference evaluation func- tions, we have demonstrated system reconfigurability for 20% changes in system con- ditions, we have demonstrated extreme scalability of our proposed algorithm, we have demonstrated that sensor networks can overcome disruptions of up to 20% in network conditions, and have demonstrated system reconfigurability to 20% changes in system conditions in hardware-based simulations. This final report summarizes how each of these milestones was achieved, and gives insight into future research possibilities past the work which has been completed. The following publications support these milestones [6, 8, 9, 10, 16, 18, 19].

  14. Cyber physical modeling of distributed resources for distribution system operations

    OpenAIRE

    Chatzivasileiadis, Spyros; Bonvini, Marco; Matanza, Javier; Yin, Rongxin; LIU, ZHENHUA; Nouidui, Thierry; Kara, Emre C.; Parmar, Rajiv; Lorenzetti, David; Wetter, Michael; Kiliccote, Sila

    2015-01-01

    Co-simulation platforms are necessary to study the interactions of complex systems integrated in future smart grids. The Virtual Grid Integration Laboratory (VirGIL) is a modular co-simulation platform designed to study interactions between demand response strategies, building comfort, communication networks, and power system operation. This paper presents the coupling of power systems, buildings, communications and control under a master algorithm. There are two objectives. First, to use a m...

  15. Energy Efficiency of Distributed Environmental Control Systems

    Energy Technology Data Exchange (ETDEWEB)

    Khalifa, H. Ezzat; Isik, Can; Dannenhoffer, John F. III

    2011-02-23

    In this report, we present an analytical evaluation of the potential of occupant-regulated distributed environmental control systems (DECS) to enhance individual occupant thermal comfort in an office building with no increase, and possibly even a decrease in annual energy consumption. To this end we developed and applied several analytical models that allowed us to optimize comfort and energy consumption in partitioned office buildings equipped with either conventional central HVAC systems or occupant-regulated DECS. Our approach involved the following interrelated components: 1. Development of a simplified lumped-parameter thermal circuit model to compute the annual energy consumption. This was necessitated by the need to perform tens of thousands of optimization calculations involving different US climatic regions, and different occupant thermal preferences of a population of ~50 office occupants. Yearly transient simulations using TRNSYS, a time-dependent building energy modeling program, were run to determine the robustness of the simplified approach against time-dependent simulations. The simplified model predicts yearly energy consumption within approximately 0.6% of an equivalent transient simulation. Simulations of building energy usage were run for a wide variety of climatic regions and control scenarios, including traditional “one-size-fits-all” (OSFA) control; providing a uniform temperature to the entire building, and occupant-selected “have-it-your-way” (HIYW) control with a thermostat at each workstation. The thermal model shows that, un-optimized, DECS would lead to an increase in building energy consumption between 3-16% compared to the conventional approach depending on the climate regional and personal preferences of building occupants. Variations in building shape had little impact in the relative energy usage. 2. Development of a gradient-based optimization method to minimize energy consumption of DECS while keeping each occupant

  16. Financing options for public electric systems

    Energy Technology Data Exchange (ETDEWEB)

    Perkins, C.M.

    Public utilities, traditionally restricted in sources of capital, in recent years have developed innovations in financing. The predominant method for raising capital is long-term revenue bonds. Newer devices include warrants (attached to bonds; must be exercised within stated time), variable rates, deep discount (bond carrying coupon 300 to 400 basis points less than market interest, purchased 20 to 30% below face value), calls and puts (call prohibits redemption for stated time; put allows early specified redemption), defeasance (issue of refunding bonds at lower interest rate to refund earlier issues), shelf registration (official statement ready on moment's notice), insurance on principal and interest, leasing arrangements, lines of credit, tax-exempt commercial paper, bond anticipation notes, minibonds, cash management, and techniques such as swaps, options, and futures. 3 figures, 1 table.

  17. Simulation of warehousing and distribution systems

    Directory of Open Access Journals (Sweden)

    Drago Pupavac

    2005-08-01

    Full Text Available The modern world abounds in simulation models. Thousands of organizations use simulation models to solve business problems. Problems in micro logistics systems are a very important segment of the business problems that can be solved by a simulation method. In most cases logistics simulation models should be developed with a purpose to evaluate the performance of individual value-adding indirect resources of logistics system, their possibilities and operational advantages as well as the flow of logistics entities between the plants, warehouses, and customers. Accordingly, this scientific paper elaborates concisely the theoretical characteristics of simulation models and the domains in which the simulation approach is best suited in logistics. Special attention is paid to simulation modeling of warehousing and distribution subsystems of logistic system and there is an example of spreadsheet application in the function of simulated demand for goods from warehouse. Apart from simulation model induction and deduction methods, the description method and a method of information modeling are applied.

  18. Improving Newspaper Distribution with Mobile Field Systems

    Directory of Open Access Journals (Sweden)

    Jonas Rehn

    2001-12-01

    Full Text Available In this paper the information, which is exchanged among the field workers and the operation center in morning newspaper distribution, is described. This information exchange is made via telephone calls and stationary computers, but is also paper based. This study was conducted to find how this information exchange could be improved with a mobile field system and handheld electronic devices.The results showed that there are technologies available today that can be used for electronic information exchange and that this could improve the safety for the truck drivers and carriers. Moreover, the time for solving problems will increase when the information exchange is improved. However, this electronic information exchange will require new working methods for the personnel involved.

  19. Noise analysis in power distribution systems

    Science.gov (United States)

    Danisor, Alin

    2016-12-01

    This paper proposes an analysis, especially in time domain, of the electrical noise existent on the power distribution lines. This study is important for the use of powerlines as a channel of information transmissions. This information may refer to analog signals and as well to digital signals. The main problem addressed in this paper consists in the characterization of the background noise and to establish his statistical proprieties. It is very important to know if the noise induced in the transmission channel is a stationary one, or even an ergodic one. The main parameters like the mean value, the mean square value were determined in this paper. The approximation of the probability density function of each statistical parameter was studied. The pulses induced in the transmission channel by the transient phenomena of the power electrical systems were considered deterministic signals and their contributions were not included in this study.

  20. Distributed generation and centralized power system in Thailand

    DEFF Research Database (Denmark)

    Sukkumnoed, Decharut

    The paper examines and discusses conflicts between the development of distributed power and centralized power system in Thailand.......The paper examines and discusses conflicts between the development of distributed power and centralized power system in Thailand....

  1. Distributed generation and centralized power system in Thailand

    DEFF Research Database (Denmark)

    Sukkumnoed, Decharut

    2004-01-01

    The paper examines and discusses conflicts between the development of distributed power and centralized power system.......The paper examines and discusses conflicts between the development of distributed power and centralized power system....

  2. Programming language impact on the development of distributed systems

    National Research Council Canada - National Science Library

    Ghosh, Debasish; Sheehy, Justin; Thorup, Kresten Krab; Vinoski, Steve

    2012-01-01

    Programming languages have long impacted the development of distributed systems. While much middleware and distributed systems code continues to be developed today using mainstream languages such as Java and C++...

  3. Public health preparedness in Alberta: a systems-level study

    Directory of Open Access Journals (Sweden)

    Noseworthy Tom

    2006-12-01

    Full Text Available Abstract Background Recent international and national events have brought critical attention to the Canadian public health system and how prepared the system is to respond to various types of contemporary public health threats. This article describes the study design and methods being used to conduct a systems-level analysis of public health preparedness in the province of Alberta, Canada. The project is being funded under the Health Research Fund, Alberta Heritage Foundation for Medical Research. Methods/Design We use an embedded, multiple-case study design, integrating qualitative and quantitative methods to measure empirically the degree of inter-organizational coordination existing among public health agencies in Alberta, Canada. We situate our measures of inter-organizational network ties within a systems-level framework to assess the relative influence of inter-organizational ties, individual organizational attributes, and institutional environmental features on public health preparedness. The relative contribution of each component is examined for two potential public health threats: pandemic influenza and West Nile virus. Discussion The organizational dimensions of public health preparedness depend on a complex mix of individual organizational characteristics, inter-agency relationships, and institutional environmental factors. Our study is designed to discriminate among these different system components and assess the independent influence of each on the other, as well as the overall level of public health preparedness in Alberta. While all agree that competent organizations and functioning networks are important components of public health preparedness, this study is one of the first to use formal network analysis to study the role of inter-agency networks in the development of prepared public health systems.

  4. Assessing Eli Broad's Assault on Public School System Leadership

    Science.gov (United States)

    English, Fenwick W.; Crowder, Zan

    2012-01-01

    Eli Broad's approach to reforming urban public education does not recognize his own self-interest in promoting changes within such educational systems, a classic problem of misrecognition. The Broad agenda is an assault on the notion of the mission of public education as a service instead of a for-profit enterprise concerned with making money for…

  5. Warning systems and public warning response

    Energy Technology Data Exchange (ETDEWEB)

    Sorensen, J.H.

    1993-09-01

    This background paper reviews current knowledge on warning systems and human response to warnings. It expands on an earlier paper prepared for a workshop on the Second Assessment on Natural Hazards, held in Estes Park, Colorado in July 1992. Although it has a North American perspective, many of the lessons learned are universally applicable. The paper addresses warning systems in terms of dissemination and does not cover physical science issues associated with prediction and forecast. Finally, it covers hazards with relatively short lead times -- 48 hours or less. It does not address topics such as long-term forecasts of earthquakes or volcanic eruptions or early famine warning systems.

  6. Investigating the health care delivery system in Japan and reviewing the local public hospital reform

    Directory of Open Access Journals (Sweden)

    Zhang X

    2016-03-01

    Full Text Available Xing Zhang, Tatsuo Oyama National Graduate Institute for Policy Studies, Tokyo, Japan Abstract: Japan's health care system is considered one of the best health care systems in the world. Hospitals are one of the most important health care resources in Japan. As such, we investigate Japanese hospitals from various viewpoints, including their roles, ownership, regional distribution, and characteristics with respect to the number of beds, staff, doctors, and financial performance. Applying a multivariate analysis and regression model techniques, we show the functional differences between urban populated prefectures and remote ones; the equality gap among all prefectures with respect to the distribution of the number of beds, staff, and doctors; and managerial differences between private and public hospitals. We also review and evaluate the local public hospital reform executed in 2007 from various financial aspects related to the expenditure and revenue structure by comparing public and private hospitals. We show that the 2007 reform contributed to improving the financial situation of local public hospitals. Strategic differences between public and private hospitals with respect to their management and strategy to improve their financial situation are also quantitatively analyzed in detail. Finally, the remaining problems and the future strategy to further improve the Japanese health care system are described. Keywords: health care system, health care resource, public hospital, multivariate regression model, financial performance

  7. An Overview of Low Voltage DC Distribution Systems for Residential Applications

    DEFF Research Database (Denmark)

    Diaz, Enrique Rodriguez; Firoozabadi, Mehdi Savaghebi; Quintero, Juan Carlos Vasquez;

    2015-01-01

    The concept of a microgrid has drawn the interest of research community in recent years. The most interesting aspects are the integration of renewable energy sources and energy storage systems at the consumption level, aiming to increase power quality, reliability and efficiency. On top of this...... applications. Several publications that study the potential energy savings and overall advantages of the LVDC distribution systems are analysed. Different power architectures and topologies are discussed. The existing demonstration facilities where LVDC distribution systems have been implemented are also shown......., the increasing of DC-based loads has re-open the discussion of DC vs AC distribution systems. As a consequence a lot of research has been done on DC distribution systems and its potential for residential applications. This paper presents an overview of the LVDC distribution systems used in residential...

  8. Publicly funded medical savings accounts: expenditure and distributional impacts in Ontario, Canada.

    Science.gov (United States)

    Hurley, Jeremiah; Guindon, G Emmanuel; Rynard, Vicki; Morgan, Steve

    2008-10-01

    This paper presents the findings from simulations of the introduction of publicly funded medical savings accounts (MSAs) in the province of Ontario, Canada. The analysis exploits a unique data set linking population-based health survey information with individual-level information on all physician services and hospital services utilization over a four-year period. The analysis provides greater detail along three dimensions than have previous analyses: (1) the distributional impacts of publicly funded MSAs across individuals of differing health statuses, incomes, ages, and current expenditures; (2) the impact of differing degrees of risk adjustment for MSA contributions; and (3) the impact of MSA funding over multiple years, incorporating year-to-year variation in spending at the individual level. In addition, it analyses more plausible designs for publicly funded MSAs than the existing studies. Government uses information available from year t - 1 to allocate its budget for year t in a manner that is ex ante fiscally neutral for the public sector: the government first withholds funds equal to expected catastrophic insurance payments under the MSA plan, and then allocates only the balance to individual MSA accounts. The government captures the savings associated with reduced health-care utilization under MSAs and we examine deductibles that vary by income rather than by current health-care expenditures. The impacts on public expenditures under these designs are more modest than in the previous studies and under plausible assumptions MSAs are predicted to decrease public expenditures. MSAs, however, are also predicted to have unavoidable negative distributional consequences with respect to both public expenditures and out-of-pocket spending.

  9. Advanced feed water distributing system for WWER 440 steam generators

    Energy Technology Data Exchange (ETDEWEB)

    Matal, O.; Klinga, J. [Energovyzkum Ltd, Brno (Switzerland); Grazl, K. [Vitkovice s.c., Ostrava (Switzerland); Tischler, J.; Mihalik, M. [SEP Atomove Elektrarne Bohunice (Slovakia)

    1995-12-31

    The original designed feed water distributing system was replaced by an advanced one. The characteristics of both feed water distributing systems have been measured and evaluated. The paper deals with the problems of measurement and evaluation of both feed water distributing system characteristics and comparison of statistical data obtained. (orig.). 3 refs.

  10. Fractional System Identification: An Approach Using Continuous Order-Distributions

    Science.gov (United States)

    Hartley, Tom T.; Lorenzo, Carl F.

    1999-01-01

    This paper discusses the identification of fractional- and integer-order systems using the concept of continuous order-distribution. Based on the ability to define systems using continuous order-distributions, it is shown that frequency domain system identification can be performed using least squares techniques after discretizing the order-distribution.

  11. 47 CFR 73.626 - DTV distributed transmission systems.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 4 2010-10-01 2010-10-01 false DTV distributed transmission systems. 73.626... RADIO BROADCAST SERVICES Television Broadcast Stations § 73.626 DTV distributed transmission systems. (a... distributed transmission system (DTS). Except as expressly provided in this section, DTV stations operating...

  12. 46 CFR 28.360 - Electrical distribution systems.

    Science.gov (United States)

    2010-10-01

    ... Operate With More Than 16 Individuals on Board § 28.360 Electrical distribution systems. (a) Each electrical distribution system which has a neutral bus or conductor must have the neutral bus or conductor... 46 Shipping 1 2010-10-01 2010-10-01 false Electrical distribution systems. 28.360 Section...

  13. 46 CFR 28.855 - Electrical distribution systems.

    Science.gov (United States)

    2010-10-01

    ... FISHING INDUSTRY VESSELS Aleutian Trade Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a neutral bus or conductor must have the neutral bus or conductor... 46 Shipping 1 2010-10-01 2010-10-01 false Electrical distribution systems. 28.855 Section...

  14. US Forest Service Public Land Survey System Sections

    Data.gov (United States)

    US Forest Service, Department of Agriculture — A map service on the www depicting areas defined by the Public Lands Survey System Grid. Normally, 36 sections make up a township. Sections cover US Forest Service...

  15. Public Land Survey System - Sections on USDA Forest Service Lands

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — This feature class depicts the boundaries of Land Survey features called sections, defined by the Public Lands Survey System Grid. Normally, 36 sections make up a...

  16. Cultural Change, the Hybrid Administrative System and Public ...

    African Journals Online (AJOL)

    2013-01-17

    Jan 17, 2013 ... crackdown on corruption, this article explores the view that it is the hybrid .... decentralization and public participation in governance creates new demands. ..... The Hybrid Administrative System and Corporate Culture.

  17. US Forest Service Public Land Survey System Townships

    Data.gov (United States)

    US Forest Service, Department of Agriculture — A map service on the www depicting areas defined by the Public Lands Survey System grid that are referenced by their tier and range numbers, and are normally...

  18. Cathode power distribution system and method of using the same for power distribution

    Science.gov (United States)

    Williamson, Mark A; Wiedmeyer, Stanley G; Koehl, Eugene R; Bailey, James L; Willit, James L; Barnes, Laurel A; Blaskovitz, Robert J

    2014-11-11

    Embodiments include a cathode power distribution system and/or method of using the same for power distribution. The cathode power distribution system includes a plurality of cathode assemblies. Each cathode assembly of the plurality of cathode assemblies includes a plurality of cathode rods. The system also includes a plurality of bus bars configured to distribute current to each of the plurality of cathode assemblies. The plurality of bus bars include a first bus bar configured to distribute the current to first ends of the plurality of cathode assemblies and a second bus bar configured to distribute the current to second ends of the plurality of cathode assemblies.

  19. Guest Editor's Introduction: Special section on dependable distributed systems

    Science.gov (United States)

    Fetzer, Christof

    1999-09-01

    We rely more and more on computers. For example, the Internet reshapes the way we do business. A `computer outage' can cost a company a substantial amount of money. Not only with respect to the business lost during an outage, but also with respect to the negative publicity the company receives. This is especially true for Internet companies. After recent computer outages of Internet companies, we have seen a drastic fall of the shares of the affected companies. There are multiple causes for computer outages. Although computer hardware becomes more reliable, hardware related outages remain an important issue. For example, some of the recent computer outages of companies were caused by failed memory and system boards, and even by crashed disks - a failure type which can easily be masked using disk mirroring. Transient hardware failures might also look like software failures and, hence, might be incorrectly classified as such. However, many outages are software related. Faulty system software, middleware, and application software can crash a system. Dependable computing systems are systems we can rely on. Dependable systems are, by definition, reliable, available, safe and secure [3]. This special section focuses on issues related to dependable distributed systems. Distributed systems have the potential to be more dependable than a single computer because the probability that all computers in a distributed system fail is smaller than the probability that a single computer fails. However, if a distributed system is not built well, it is potentially less dependable than a single computer since the probability that at least one computer in a distributed system fails is higher than the probability that one computer fails. For example, if the crash of any computer in a distributed system can bring the complete system to a halt, the system is less dependable than a single-computer system. Building dependable distributed systems is an extremely difficult task. There is no

  20. Characterizing and Improving Distributed Intrusion Detection Systems.

    Energy Technology Data Exchange (ETDEWEB)

    Hurd, Steven A; Proebstel, Elliot P.

    2007-11-01

    Due to ever-increasing quantities of information traversing networks, network administrators are developing greater reliance upon statistically sampled packet information as the source for their intrusion detection systems (IDS). Our research is aimed at understanding IDS performance when statistical packet sampling is used. Using the Snort IDS and a variety of data sets, we compared IDS results when an entire data set is used to the results when a statistically sampled subset of the data set is used. Generally speaking, IDS performance with statistically sampled information was shown to drop considerably even under fairly high sampling rates (such as 1:5). Characterizing and Improving Distributed Intrusion Detection Systems4AcknowledgementsThe authors wish to extend our gratitude to Matt Bishop and Chen-Nee Chuah of UC Davis for their guidance and support on this work. Our thanks are also extended to Jianning Mai of UC Davis and Tao Ye of Sprint Advanced Technology Labs for their generous assistance.We would also like to acknowledge our dataset sources, CRAWDAD and CAIDA, without which this work would not have been possible. Support for OC48 data collection is provided by DARPA, NSF, DHS, Cisco and CAIDA members.

  1. Manganese deposition in drinking water distribution systems.

    Science.gov (United States)

    Gerke, Tammie L; Little, Brenda J; Barry Maynard, J

    2016-01-15

    This study provides a physicochemical assessment of manganese deposits on brass and lead components from two fully operational drinking water distributions systems. One of the systems was maintained with chlorine; the other, with secondary chloramine disinfection. Synchrotron-based in-situ micro X-ray adsorption near edge structure was used to assess the mineralogy. In-situ micro X-ray fluorescence mapping was used to demonstrate the spatial relationships between manganese and potentially toxic adsorbed metal ions. The Mn deposits ranged in thickness from 0.01 to 400 μm. They were composed primarily of Mn oxides/oxhydroxides, birnessite (Mn(3+) and Mn(4+)) and hollandite (Mn(2+) and Mn(4+)), and a Mn silicate, braunite (Mn(2+) and Mn(4+)), in varying proportions. Iron, chromium, and strontium, in addition to the alloying elements lead and copper, were co-located within manganese deposits. With the exception of iron, all are related to specific health issues and are of concern to the U.S. Environmental Protection Agency (U.S. EPA). The specific properties of Mn deposits, i.e., adsorption of metals ions, oxidation of metal ions and resuspension are discussed with respect to their influence on drinking water quality.

  2. Hydro power potentials of water distribution networks in public universities: A case study

    Directory of Open Access Journals (Sweden)

    Olufemi Adebola KOYA

    2017-06-01

    Full Text Available Public Universities in Southwestern Nigeria are densely populated student-resident campuses, so that provision of regular potable water and electricity are important, but power supply is not optimally available for all the necessary activities. This study assesses the hydropower potential of the water distribution networks in the Universities, with the view to augmenting the inadequate power supplies. The institutions with water distribution configuration capable of accommodating in-pipe turbine are identified; the hydropower parameters, such as the flow characteristics and the pipe geometry are determined to estimate the water power. Global positioning device is used in estimating the elevations of the distribution reservoirs and the nodal points. The hydropower potential of each location is computed incorporating Lucid® Lift-based spherical turbine in the pipeline. From the analysis, the lean and the peak water power are between 1.92 – 3.30 kW and 3.95 – 7.24 kW, respectively, for reservoir-fed distribution networks; while, a minimum of 0.72 kW is got for pipelines associated with borehole-fed overhead tanks. Possible applications of electricity generation from the water distribution networks of the public universities are recommended.

  3. Distributed control system for demand response by servers

    Science.gov (United States)

    Hall, Joseph Edward

    Within the broad topical designation of smart grid, research in demand response, or demand-side management, focuses on investigating possibilities for electrically powered devices to adapt their power consumption patterns to better match generation and more efficiently integrate intermittent renewable energy sources, especially wind. Devices such as battery chargers, heating and cooling systems, and computers can be controlled to change the time, duration, and magnitude of their power consumption while still meeting workload constraints such as deadlines and rate of throughput. This thesis presents a system by which a computer server, or multiple servers in a data center, can estimate the power imbalance on the electrical grid and use that information to dynamically change the power consumption as a service to the grid. Implementation on a testbed demonstrates the system with a hypothetical but realistic usage case scenario of an online video streaming service in which there are workloads with deadlines (high-priority) and workloads without deadlines (low-priority). The testbed is implemented with real servers, estimates the power imbalance from the grid frequency with real-time measurements of the live outlet, and uses a distributed, real-time algorithm to dynamically adjust the power consumption of the servers based on the frequency estimate and the throughput of video transcoder workloads. Analysis of the system explains and justifies multiple design choices, compares the significance of the system in relation to similar publications in the literature, and explores the potential impact of the system.

  4. Integrated Propulsion Data System Public Web Site

    Science.gov (United States)

    Hamilton, Kimberly

    2001-01-01

    The Integrated Propulsion Data System's (IPDS) focus is to provide technologically-advanced philosophies of doing business at SSC that will enhance the existing operations, engineering and management strategies and provide insight and metrics to assess their daily impacts, especially as related to the Propulsion Test Directorate testing scenarios for the 21st Century.

  5. Accounting for the Danish Public School System

    DEFF Research Database (Denmark)

    Graversen, Marie Engstrøm

    the opportunity/danger for more adverse behavioral responses to be triggered. The field studies make plain that the level of competitive pressure and budgetary risk are very influential in ensuring that the funding model is more than a reimbursement system, making it instead a mean through which providers...

  6. A Policy Analysis of Public School Retirement Systems

    Science.gov (United States)

    Lewis, Tara; Teeter, Matt

    2010-01-01

    The purpose of this policy analysis was to examine the Missouri Public School Retirement System (PSRS). The team investigated the under-funding of PSRS, relating to sustainability and the feasibility of the system's use of one lever, contribution rate, to stabilize the retirement system, and to meet actuary needs and governmental requirements. The…

  7. Accounting System in Croatian Public Healthcare Organizations: an Empirical Analysis

    Directory of Open Access Journals (Sweden)

    Davor VAŠIČEK

    2010-06-01

    Full Text Available In considering the adequacy of adopting accruals and IPSASs, this paper tests the appropriateness of existing modified accrual accounting and financial reporting system in Croatian public healthcare sector. The paper indicates that accounting information system contains discrepancies and constraints in assuring true and fair view of organization’s financial position and performance. Our statistics confirms low level of cost and managerial accounting methods development, and external and internal financial reporting convergence.Having in mind its specificities, we argue that Croatian public healthcare sector represents a segmental accounting subsystem within the integral public sector accounting framework, where accruals implementation might prove justifiable.

  8. Analysis of Satisfaction Degree of the Public Insurance System Beneficiaries

    Directory of Open Access Journals (Sweden)

    Manuela PANAITESCU

    2013-08-01

    Full Text Available The public insurance system provides financial benefits to individuals that are obtained by collecting the due contributions. The analysis of satisfaction degree of the beneficiaries of the system was carried out to determine the challenges the system is facing and for determining the needs of the beneficiaries. In order to reduce the financial constraints the public insurance system is facing, it is necessary to create an appropriate insurance system that meets the needs of the beneficiaries. The research took into account that the public insurance system determines the quality of life of the population and has a strong influence on the economy, particularly on the labour market and the capital market.

  9. Theory of constraints for publicly funded health systems.

    Science.gov (United States)

    Sadat, Somayeh; Carter, Michael W; Golden, Brian

    2013-03-01

    Originally developed in the context of publicly traded for-profit companies, theory of constraints (TOC) improves system performance through leveraging the constraint(s). While the theory seems to be a natural fit for resource-constrained publicly funded health systems, there is a lack of literature addressing the modifications required to adopt TOC and define the goal and performance measures. This paper develops a system dynamics representation of the classical TOC's system-wide goal and performance measures for publicly traded for-profit companies, which forms the basis for developing a similar model for publicly funded health systems. The model is then expanded to include some of the factors that affect system performance, providing a framework to apply TOC's process of ongoing improvement in publicly funded health systems. Future research is required to more accurately define the factors affecting system performance and populate the model with evidence-based estimates for various parameters in order to use the model to guide TOC's process of ongoing improvement.

  10. Sharing lattice QCD data over a widely distributed file system

    Science.gov (United States)

    Amagasa, T.; Aoki, S.; Aoki, Y.; Aoyama, T.; Doi, T.; Fukumura, K.; Ishii, N.; Ishikawa, K.-I.; Jitsumoto, H.; Kamano, H.; Konno, Y.; Matsufuru, H.; Mikami, Y.; Miura, K.; Sato, M.; Takeda, S.; Tatebe, O.; Togawa, H.; Ukawa, A.; Ukita, N.; Watanabe, Y.; Yamazaki, T.; Yoshie, T.

    2015-12-01

    JLDG is a data-grid for the lattice QCD (LQCD) community in Japan. Several large research groups in Japan have been working on lattice QCD simulations using supercomputers distributed over distant sites. The JLDG provides such collaborations with an efficient method of data management and sharing. File servers installed on 9 sites are connected to the NII SINET VPN and are bound into a single file system with the GFarm. The file system looks the same from any sites, so that users can do analyses on a supercomputer on a site, using data generated and stored in the JLDG at a different site. We present a brief description of hardware and software of the JLDG, including a recently developed subsystem for cooperating with the HPCI shared storage, and report performance and statistics of the JLDG. As of April 2015, 15 research groups (61 users) store their daily research data of 4.7PB including replica and 68 million files in total. Number of publications for works which used the JLDG is 98. The large number of publications and recent rapid increase of disk usage convince us that the JLDG has grown up into a useful infrastructure for LQCD community in Japan.

  11. Distribution System Reliability Evaluation Taking Circuit Capacity into Consideration

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Distribution system reliability evaluation using the method ofconnectivity ignores the effect of operation constraints. This paper presents an approach that includes the effect of circuit capacity. Reliability evaluation of distribution systems with parallel circuits generally requires load flow solutions. The proposed approach combines the Z-matrix contingency method with DC load flow for a much faster direct solution. Three different methods for distribution system reliability evaluation have been incorporated into a computer program. The program was validated using two distribution systems connected to the IEEE-RTS and another sample distribution system.

  12. Electric Vehicle (EV) Charging Management with Dynamic Distribution System Tariff

    DEFF Research Database (Denmark)

    O'Connell, Niamh; Wu, Qiuwei; Østergaard, Jacob

    2011-01-01

    congestions in local distribution systems from the day-ahead planning perspective. Locational marginal pricing method was used to determine the dynamic distribution system tariff based on predicted day-ahead spot prices and predicted charging behaviors. Distribution grids of the Bornholm power system were......An electric vehicle (EV) charging schedule algorithm was proposed in this paper in order to charge EVs to meet EV users’ driving needs with the minimum EV charging cost and respect the local distribution system constraints. A day-ahead dynamic distribution system tariff scheme was proposed to avoid...

  13. IDCDACS: IDC's Distributed Application Control System

    Science.gov (United States)

    Ertl, Martin; Boresch, Alexander; Kianička, Ján; Sudakov, Alexander; Tomuta, Elena

    2015-04-01

    The Preparatory Commission for the CTBTO is an international organization based in Vienna, Austria. Its mission is to establish a global verification regime to monitor compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which bans all nuclear explosions. For this purpose time series data from a global network of seismic, hydro-acoustic and infrasound (SHI) sensors are transmitted to the International Data Centre (IDC) in Vienna in near-real-time, where it is processed to locate events that may be nuclear explosions. We newly designed the distributed application control system that glues together the various components of the automatic waveform data processing system at the IDC (IDCDACS). Our highly-scalable solution preserves the existing architecture of the IDC processing system that proved successful over many years of operational use, but replaces proprietary components with open-source solutions and custom developed software. Existing code was refactored and extended to obtain a reusable software framework that is flexibly adaptable to different types of processing workflows. Automatic data processing is organized in series of self-contained processing steps, each series being referred to as a processing pipeline. Pipelines process data by time intervals, i.e. the time-series data received from monitoring stations is organized in segments based on the time when the data was recorded. So-called data monitor applications queue the data for processing in each pipeline based on specific conditions, e.g. data availability, elapsed time or completion states of preceding processing pipelines. IDCDACS consists of a configurable number of distributed monitoring and controlling processes, a message broker and a relational database. All processes communicate through message queues hosted on the message broker. Persistent state information is stored in the database. A configurable processing controller instantiates and monitors all data processing

  14. Detection of contamination of municipal water distribution systems

    Science.gov (United States)

    Cooper, John F.

    2012-01-17

    A system for the detection of contaminates of a fluid in a conduit. The conduit is part of a fluid distribution system. A chemical or biological sensor array is connected to the conduit. The sensor array produces an acoustic signal burst in the fluid upon detection of contaminates in the fluid. A supervisory control system connected to the fluid and operatively connected to the fluid distribution system signals the fluid distribution system upon detection of contaminates in the fluid.

  15. Web-Based Collaborative Publications System: R&Tserve

    Science.gov (United States)

    Abrams, Steve

    1997-01-01

    R&Tserve is a publications system based on 'commercial, off-the-shelf' (COTS) software that provides a persistent, collaborative workspace for authors and editors to support the entire publication development process from initial submission, through iterative editing in a hierarchical approval structure, and on to 'publication' on the WWW. It requires no specific knowledge of the WWW (beyond basic use) or HyperText Markup Language (HTML). Graphics and URLs are automatically supported. The system includes a transaction archive, a comments utility, help functionality, automated graphics conversion, automated table generation, and an email-based notification system. It may be configured and administered via the WWW and can support publications ranging from single page documents to multiple-volume 'tomes'.

  16. Research on the Evaluation System for Rural Public Safety Planning

    Institute of Scientific and Technical Information of China (English)

    Ming; SUN; Jianxin; YAN

    2014-01-01

    The indicator evaluation system is introduced to the study of rural public safety planning in this article.By researching the current rural public safety planning and environmental carrying capacity,we select some carrying capacity indicators influencing the rural public safety,such as land,population,ecological environment,water resources,infrastructure,economy and society,to establish the environmental carrying capacity indicator system.We standardize the indicators,use gray correlation analysis method to determine the weight of indicators,and make DEA evaluation of the indicator system,to obtain the evaluation results as the basis for decision making in rural safety planning,and provide scientific and quantified technical support for rural public safety planning.

  17. The design of PoliDocs: a web information system for the disclosure of Dutch parliamentary publications

    NARCIS (Netherlands)

    Gielissen, T.; Marx, M.

    2009-01-01

    The development of PoliDocs.nl, a Web Information System for the disclosure of Dutch parliamentary publications, is an effort to improve the disclosure of parliamentary publications in The Netherlands. The data is distributed over three sources and is available through different Web Information Syst

  18. The design of PoliDocs: a web information system for the disclosure of Dutch parliamentary publications

    NARCIS (Netherlands)

    Gielissen, T.; Marx, M.

    2009-01-01

    The development of PoliDocs.nl, a Web Information System for the disclosure of Dutch parliamentary publications, is an effort to improve the disclosure of parliamentary publications in The Netherlands. The data is distributed over three sources and is available through different Web Information

  19. The LHC Beam Dumping System Trigger Synchronisation and Distribution System

    CERN Document Server

    Antoine, A; Voumard, N

    2005-01-01

    Two LHC beam dumping systems (LBDS) will fast-extract the counter-rotating beams safely from the LHC collider during setting-up of the accelerator, at the end of a physics run and in case of emergencies. They consist of 15 fast pulsed magnets per ring for beam extraction from the accelerator combined with 10 fast pulsed magnets for horizontal and vertical beam dilution. Dump requests will come from 3 different sources: the machine protection system for emergency cases, the machine timing system for scheduled dumps or the LBDS itself in case of internal failures. These spontaneously issued dump requests will be synchronised with the 3 µs beam abort gap within a fail-safe trigger synchronisation unit (TSU) based on a digital phase lock loop (DPLL) locked on the beam revolution frequency with a maximum phase error of 40 ns. Afterwards, the synchronised trigger pulse will be distributed to the fast pulsed magnet high voltage generators through a redundant fault tolerant trigger distribution system based on the...

  20. Energy Efficiency of Distributed Environmental Control Systems

    Energy Technology Data Exchange (ETDEWEB)

    Khalifa, H. Ezzat; Isik, Can; Dannenhoffer, John F. III

    2011-02-23

    In this report, we present an analytical evaluation of the potential of occupant-regulated distributed environmental control systems (DECS) to enhance individual occupant thermal comfort in an office building with no increase, and possibly even a decrease in annual energy consumption. To this end we developed and applied several analytical models that allowed us to optimize comfort and energy consumption in partitioned office buildings equipped with either conventional central HVAC systems or occupant-regulated DECS. Our approach involved the following interrelated components: 1. Development of a simplified lumped-parameter thermal circuit model to compute the annual energy consumption. This was necessitated by the need to perform tens of thousands of optimization calculations involving different US climatic regions, and different occupant thermal preferences of a population of ~50 office occupants. Yearly transient simulations using TRNSYS, a time-dependent building energy modeling program, were run to determine the robustness of the simplified approach against time-dependent simulations. The simplified model predicts yearly energy consumption within approximately 0.6% of an equivalent transient simulation. Simulations of building energy usage were run for a wide variety of climatic regions and control scenarios, including traditional “one-size-fits-all” (OSFA) control; providing a uniform temperature to the entire building, and occupant-selected “have-it-your-way” (HIYW) control with a thermostat at each workstation. The thermal model shows that, un-optimized, DECS would lead to an increase in building energy consumption between 3-16% compared to the conventional approach depending on the climate regional and personal preferences of building occupants. Variations in building shape had little impact in the relative energy usage. 2. Development of a gradient-based optimization method to minimize energy consumption of DECS while keeping each occupant

  1. Real-time Distributed Economic Dispatch forDistributed Generation Based on Multi-Agent System

    DEFF Research Database (Denmark)

    Luo, Kui; Wu, Qiuwei; Nielsen, Arne Hejde

    2015-01-01

    The distributed economic dispatch for distributed generation is formulated as a optimization problem with equality and inequality constraints. An effective distributed approach based on multi-agent system is proposed for solving the economic dispatch problem in this paper. The proposed approach...... distributed manner with local computation and communication among neighboring agent. The feasibility and effectiveness of this approach is demonstrated by a numerical test system....

  2. Applied optimal control theory of distributed systems

    CERN Document Server

    Lurie, K A

    1993-01-01

    This book represents an extended and substantially revised version of my earlierbook, Optimal Control in Problems ofMathematical Physics,originally published in Russian in 1975. About 60% of the text has been completely revised and major additions have been included which have produced a practically new text. My aim was to modernize the presentation but also to preserve the original results, some of which are little known to a Western reader. The idea of composites, which is the core of the modern theory of optimization, was initiated in the early seventies. The reader will find here its implementation in the problem of optimal conductivity distribution in an MHD-generatorchannel flow.Sincethen it has emergedinto an extensive theory which is undergoing a continuous development. The book does not pretend to be a textbook, neither does it offer a systematic presentation of the theory. Rather, it reflects a concept which I consider as fundamental in the modern approach to optimization of dis­ tributed systems. ...

  3. Analysing improvements to on-street public transport systems: a mesoscopic model approach

    DEFF Research Database (Denmark)

    Ingvardson, Jesper Bláfoss; Kornerup Jensen, Jonas; Nielsen, Otto Anker

    2017-01-01

    Light rail transit and bus rapid transit have shown to be efficient and cost-effective in improving public transport systems in cities around the world. As these systems comprise various elements, which can be tailored to any given setting, e.g. pre-board fare-collection, holding strategies...... and other advanced public transport systems (APTS), the attractiveness of such systems depends heavily on their implementation. In the early planning stage it is advantageous to deploy simple and transparent models to evaluate possible ways of implementation. For this purpose, the present study develops...... a mesoscopic model which makes it possible to evaluate public transport operations in details, including dwell times, intelligent traffic signal timings and holding strategies while modelling impacts from other traffic using statistical distributional data thereby ensuring simplicity in use and fast...

  4. Plasma distribution of cathodic ARC deposition system

    Energy Technology Data Exchange (ETDEWEB)

    Anders, S.; Raoux, S.; Krishnan, K.; MacGill, R.A.; Brown, I.G. [Lawrence Berkeley National Lab., CA (United States)

    1996-08-01

    The plasma distribution using a cathodic arc plasma source with and without magnetic macroparticle filter has been determined by depositing on a transparent plastic substrate and measuring the film absorption. It was found that the width of the distribution depends on the arc current, and it also depends on the cathode material which leads to a spatial separation of the elements when an alloy cathode is used. By applying a magnetic multicusp field near the exit of the magnetic filter, it was possible to modify the plasma distribution and obtain a flat plasma profile with a constant and homogeneous elemental distribution.

  5. Software Quality Measurement for Distributed Systems. Volume 3. Distributed Computing Systems: Impact on Software Quality.

    Science.gov (United States)

    1983-07-01

    methodology precludes two computers from being casually linked together (as with SEAC and DYSEAC), but also lessens the likelihood of major innovations ...provide a more natural computer achitecture for applications such as artificial intelligence, real time command and control, and data base management. 3-7...state-of-the- art in how we can separate C31 nodes. A truly distributed C31 system may not be achievable for another 5 to 10 years. However, unless we

  6. Improving public health system performance through multiorganizational partnerships.

    Science.gov (United States)

    Mays, Glen P; Scutchfield, F Douglas

    2010-11-01

    Public health activities in the United States are delivered through multiple public and private organizations that vary widely in their resources, missions, and operations. Without strong coordination mechanisms, these delivery arrangements may perpetuate large gaps, inequities, and inefficiencies in public health activities. We examined evidence and uncertainties concerning the use of partnerships to improve the performance of the public health system, with a special focus on partnerships between public health agencies and health care organizations. We found that the types of partnerships likely to have the largest and most direct effects on population health are among the most difficult, and therefore least prevalent, forms of collaboration. High opportunity costs and weak and diffuse participation incentives hinder partnerships that focus on expanding effective prevention programs and policies. Targeted policy actions and leadership strategies are required to illuminate and enhance partnership incentives.

  7. Parallel and distributed processing: applications to power systems

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Felix; Murphy, Liam [California Univ., Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences

    1994-12-31

    Applications of parallel and distributed processing to power systems problems are still in the early stages. Rapid progress in computing and communications promises a revolutionary increase in the capacity of distributed processing systems. In this paper, the state-of-the art in distributed processing technology and applications is reviewed and future trends are discussed. (author) 14 refs.,1 tab.

  8. Comparative Analysis of Possible Designs for Flexible Distribution System Operation

    DEFF Research Database (Denmark)

    Lin, Jeremy; Knezovic, Katarina

    2016-01-01

    A massive amount of distributed energy resources will be connected to the distribution system in the near future. This emerging phenomenon will pose significant challenges to the traditional operation of distribution systems. This clearly calls for a growing need to develop novel grid designs...

  9. Short circuit analysis of distribution system with integration of DG

    DEFF Research Database (Denmark)

    Su, Chi; Liu, Zhou; Chen, Zhe

    2014-01-01

    Integration of distributed generation (DG) such as wind turbines into distribution system is increasing all around the world, because of the flexible and environmentally friendly characteristics. However, DG integration may change the pattern of the fault currents in the distribution system...... as well. The results in this paper are based on mathematical analysis and simulation study in DIgSILENT PowerFactory....

  10. 14 CFR 23.1445 - Oxygen distribution system.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Oxygen distribution system. 23.1445 Section... Equipment § 23.1445 Oxygen distribution system. (a) Except for flexible lines from oxygen outlets to the... distribution lines must not be routed where they may be subjected to elevated temperatures, electrical...

  11. Building Mail Server on Distributed Computing SYstem

    Institute of Scientific and Technical Information of China (English)

    AkihiroShibata; OsamuHamada; 等

    2001-01-01

    The electronic mail has become the indispensable function in daily job,and the server stability and performance are required.Using DCE and DFS we have built the distributed electronic mail sever,that is,servers such as SMPT,IMAP are distributed symmetrically,and provids the seamless access.

  12. Response Time Analysis of Distributed Web Systems Using QPNs

    Directory of Open Access Journals (Sweden)

    Tomasz Rak

    2015-01-01

    Full Text Available A performance model is used for studying distributed Web systems. Performance evaluation is done by obtaining load test measurements. Queueing Petri Nets formalism supports modeling and performance analysis of distributed World Wide Web environments. The proposed distributed Web systems modeling and design methodology have been applied in the evaluation of several system architectures under different external loads. Furthermore, performance analysis is done to determine the system response time.

  13. The Mandate System for the Belgian Public Prosecution

    Directory of Open Access Journals (Sweden)

    Bruno BROUCKER

    2009-12-01

    Full Text Available The law of 22 December 1998 introduced the mandate system for the heads of the Public Prosecution offices, which were appointed permanent before that. Theoretically, such a system needs to enhance, within the organization, effectiveness, efficiency, responsabilisation, and goal-orientation. However, the mandate system within the Belgian Public Prosecution was introduced prematurely, for dubious reasons and in a precipitate manner. In the current situation, the position of the mandate holder is uncertain, with a bounded autonomy and a low wage increase. Moreover, it remains impossible to intervene in the policy of appointed heads of office (during their mandate, the efficiency and effectiveness is only increased in some prosecution offices and a contract containing actual management responsibilities is absent. In sum: there is a large gap between the theoretical principles of mandate systems and the way it is introduced in the Belgian Public Prosecution.

  14. Public Science: From Earth to the Solar System

    Science.gov (United States)

    Arcand, K. K.; Watzke, M.

    2012-09-01

    This talk will describe how the International Year of Astronomy (IYA2009) was used to launch a new initiative of science outreach, which the authors describe as "public science." The enormous scope and range of IYA2009 allowed From Earth to the Universe (FETTU) to reach millions of people around the globe by putting large-scale astronomical images into public and community-based settings such as parks, metro stations, libraries, and more. Currently, its derivative project, From Earth to the Solar System (FETTSS), continues the implementation of this public science paradigm. Public science projects, like FETTU and FETTSS, are very much akin to public art, which attempts to gain attention and expose large numbers of people to its content. Can such public science projects be used to increase exposure and awareness for STEM (science, technology, engineering, and mathematics) topics? This talk will briefly describe some of the measureable outcomes in this area found in FETTU, which have already been published in scholarly journals. We will also share some preliminary findings from new data being collected from FETTSS, as well as discuss other public science projects in development. The presenter will finally explore how this concept of public science may be useful for science communication efforts in the future.

  15. Global distribution of grid connected electrical energy storage systems

    Directory of Open Access Journals (Sweden)

    Katja Buss

    2016-06-01

    Full Text Available This article gives an overview of grid connected electrical energy storage systems worldwide, based on public available data. Technologies considered in this study are pumped hydroelectric energy storage (PHES, compressed air energy storage (CAES, sodium-sulfur batteries (NaS, lead-acid batteries, redox-flow batteries, nickel-cadmium batteries (NiCd and lithium-ion batteries. As the research indicates, the worldwide installed capacity of grid connected electrical energy storage systems is approximately 154 GW. This corresponds to a share of 5.5 % of the worldwide installed generation capacity. Furthermore, the article gives an overview of the historical development of installed and used storage systems worldwide. Subsequently, the focus is on each considered technology concerning the current storage size, number of plants and location. In summary it can be stated, PHES is the most commonly used technology worldwide, whereas electrochemical technologies are increasingly gaining in importance. Regarding the distribution of grid connected storage systems reveals the share of installed storage capacity is in Europe and Eastern Asia twice as high as in North America.

  16. Pension Systems for Public School Teachers. Bulletin, 1927, No. 23

    Science.gov (United States)

    Palmer, Nida Pearl

    1927-01-01

    The development of pension systems for public-school teachers in the United States has been both recent and rapid. A beginning of their establishment was made in the latter part of the nineteenth century, and today, after 30 years, very few States are without some form of a teachers' pension system. The purpose of the present study of pension…

  17. Optimal allocation of solar based distributed generators in distribution system using Bat algorithm

    Directory of Open Access Journals (Sweden)

    Suresh Kumar Sudabattula

    2016-09-01

    Full Text Available With increased demand of electrical energy, limited availability of fossil fuels and environmental concerns, it is necessary to consider renewable energy based generation in a power system network. Optimal allocation of renewable based distributed generators in the distribution system is a challenging task in the recent years. In this paper an effective technique is proposed for optimal allocation of solar based distributed generators in the distribution network using a Bat algorithm (BA is presented. The objective is to minimize power loss of radial distribution system. Different operating constraints related to the distribution network are considered. The stochastic nature of solar irradiance is modeled by using suitable probability distribution function (PDF. The proposed method is tested and validated on IEEE 33 bus test system.

  18. Semantic interoperability between clinical and public health information systems for improving public health services.

    Science.gov (United States)

    Lopez, Diego M; Blobel, Bernd G M E

    2007-01-01

    Improving public health services requires comprehensively integrating all services including medical, social, community, and public health ones. Therefore, developing integrated health information services has to start considering business process, rules and information semantics of involved domains. The paper proposes a business and information architecture for the specification of a future-proof national integrated system, concretely the requirements for semantic integration between public health surveillance and clinical information systems. The architecture is a semantically interoperable approach because it describes business process, rules and information semantics based on national policy documents and expressed in a standard language such us the Unified Modeling Language UML. Having the enterprise and information models formalized, semantically interoperable Health IT components/services development is supported.

  19. Fractionated spacecraft: The new sprout in distributed space systems

    NARCIS (Netherlands)

    Guo, J.; Maessen, D.C.; Gill, E.K.A.

    2009-01-01

    This paper provides a survey of current state-of-the-art technologies of fractionated spacecraft, a new architecture for distributed space systems. The survey covers six aspects: architecture, networking, wireless communication, wireless power transfer, distributed computing, and planned missions

  20. Continuity and change in Mexico's Public Health System

    Directory of Open Access Journals (Sweden)

    Mónica Uribe Gómez

    2013-07-01

    Full Text Available This paper examines the reform process within the Mexican health system undertaken since the eighties that led to an increasing privatization of health services. It argues that such process have been led by a small group of techno-bureaucratic actors that have changed institutional rules according to their interests without considering the interests of local governments, public services providers and public health services users.

  1. Modeling and Control for Islanding Operation of Active Distribution Systems

    DEFF Research Database (Denmark)

    Cha, Seung-Tae; Wu, Qiuwei; Saleem, Arshad

    2011-01-01

    Along with the increasing penetration of distributed generation (DG) in distribution systems, there are more resources for system operators to improve the operation and control of the whole system and enhance the reliability of electricity supply to customers. The distribution systems with DG...... are able to operate in is-landing operation mode intentionally or unintentionally. In order to smooth the transition from grid connected operation to islanding operation for distribution systems with DG, a multi-agent based controller is proposed to utilize different re-sources in the distribution systems...... to stabilize the frequency. Different agents are defined to represent different resources in the distribution systems. A test platform with a real time digital simulator (RTDS), an OPen Connectivity (OPC) protocol server and the multi-agent based intelligent controller is established to test the proposed multi...

  2. Seasonal distribution of phytoplankton in the Aby lagoon system ...

    African Journals Online (AJOL)

    Seasonal distribution of phytoplankton in the Aby lagoon system, Ivory Coast, West ... dynamics were investigated in the Aby lagoon system, south-eastern Ivory ... Seasonal and spatial variability of nutrient concentrations in the system were ...

  3. Simulation of Tasks Distribution in Horizontally Scalable Management System

    Science.gov (United States)

    Kustov, D.; Sherstneva, A.; Botygin, I.

    2016-08-01

    This paper presents an imitational model of the task distribution system for the components of territorially-distributed automated management system with a dynamically changing topology. Each resource of the distributed automated management system is represented with an agent, which allows to set behavior of every resource in the best possible way and ensure their interaction. The agent work load imitation was done via service query imitation formed in a system dynamics style using a stream diagram. The query generation took place in the abstract-represented center - afterwards, they were sent to the drive to be distributed to management system resources according to a ranking table.

  4. Optimal design of network distribution systems

    Directory of Open Access Journals (Sweden)

    U. Passy

    2003-12-01

    Full Text Available The problem of finding the optimal distribution of pressure drop over a network is solved via an unconstrained gradient type algorithm. The developed algorithm is computationally attractive. Problems with several hundred variables and constraints were solved.

  5. Velocity distributions in dilute granular systems.

    Science.gov (United States)

    van Zon, J S; MacKintosh, F C

    2005-11-01

    We investigate the idea that velocity distributions in granular gases are determined mainly by eta, the coefficient of restitution and q, which measures the relative importance of heating (or energy input) to collisions. To this end, we study by numerical simulation the properties of inelastic gases as functions of eta, concentration phi, and particle number N with various heating mechanisms. For a wide range of parameters, we find Gaussian velocity distributions for uniform heating and non-Gaussian velocity distributions for boundary heating. Comparison between these results and velocity distributions obtained by other heating mechanisms and for a simple model of a granular gas without spatial degrees of freedom, shows that uniform and boundary heating can be understood as different limits of q, with q>1 and q < or approximately 1 respectively. We review the literature for evidence of the role of q in the recent experiments.

  6. STANDARDIZED COSTS FOR WATER SUPPLY DISTRIBUTION SYSTEMS

    Science.gov (United States)

    Presented within the report are cost data for construction and operation/maintenance of domestic water distribution and transmission pipelines, domestic water pumping stations, and domestic water storage reservoirs. To allow comparison of new construction with rehabilitation of e...

  7. Distribution systems in omni-channel retailing

    National Research Council Canada - National Science Library

    Hübner, Alexander; Holzapfel, Andreas; Kuhn, Heinrich

    2016-01-01

    .... Answering these questions retail research and practice require an overall view of the distribution concepts for direct-to-customer and store deliveries in OC retailing, including the associated return processes...

  8. Technique of CWM distribution system; CWM ryutsu chukei system gijutsu

    Energy Technology Data Exchange (ETDEWEB)

    Konno, K. [Center for Coal Utilization, Japan, Tokyo (Japan); Tanaka, M.

    1996-09-01

    It may be intended that CWM is manufactured in areas near coal producing areas in overseas countries and imported as a product requiring lower handling cost than in bulk products. In order to achieve this idea, it is necessary to establish a distribution and relaying system for product transportation inside and outside the country, including relaying bases for receiving, loading and storing the product. This paper reports results of the demonstration tests performed since 1992 to 1996. In the tests, CWM made from Chinese coals was transported from Shijiu Port to the Hibiki relaying base in the city of Kita-Kyushu on 5000 DWT ocean vessels, unloaded, stored, and loaded again on 700 DWT domestic vessels for distribution to users. Since the inauguration of transportations, 40,000 tons of CWM were delivered yearly to the Okayama plant of Tayca Company, and about 20,000 tons to the Mizushima power plant of the Chubu Electric Power Company over a period from 1995 to 1996. During the period, a number of findings were acquired in different aspects, including quality control of incoming and outgoing CWM, stability in quantity and properties, loading and unloading works, and transportation. Although reduction in subsidence during transportation and storage was indicated desirable, the practical applicability was verified for the relaying system as a whole. 4 refs., 15 figs., 3 tabs.

  9. 77 FR 21099 - Public Water System Supervision Program Approval for the State of Ohio

    Science.gov (United States)

    2012-04-09

    ... AGENCY Public Water System Supervision Program Approval for the State of Ohio AGENCY: Environmental... has tentatively approved three revisions to the State of Ohio's public water system supervision... of Ohio's public water system supervision program, thereby giving Ohio EPA primary...

  10. 77 FR 76034 - Public Water System Supervision Program Approval for the State of Ohio

    Science.gov (United States)

    2012-12-26

    ... AGENCY Public Water System Supervision Program Approval for the State of Ohio AGENCY: Environmental... has tentatively approved revisions to the State of Ohio's public water system supervision program... public water system supervision program, thereby giving Ohio EPA primary enforcement responsibility...

  11. 78 FR 14791 - Public Water System Supervision Program Approval for the State of Indiana

    Science.gov (United States)

    2013-03-07

    ... AGENCY Public Water System Supervision Program Approval for the State of Indiana AGENCY: Environmental... has tentatively approved three revisions to the State of Indiana's public water system supervision... the State of Indiana's public water system supervision program, thereby giving IDEM...

  12. A Multi-Agent System Based Protection and Control Scheme for Distribution System with Distributed Generation Integration

    DEFF Research Database (Denmark)

    Liu, Z.; Su, Chi; Hoidalen, Hans

    2017-01-01

    In this paper, a multi agent system (MAS) based protection and control scheme is proposed to deal with diverse operation conditions in distribution system due to distributed generation (DG) integration. Based on cooperation between DG controller and relays, an adaptive protection and control...... of system topology and DG status. The proposed scheme is tested and validated on a test distribution system in a hardware-in-the-loop real time testing platform....

  13. An automated system for public health surveillance of school absenteeism.

    Science.gov (United States)

    Baer, Atar; Rodriguez, Carla V; Duchin, Jeffrey S

    2011-01-01

    Public Health-Seattle & King County established an automated system for monitoring school absenteeism data from 18 of 19 public school districts in King County, Washington. The system receives a daily aggregate count of the number of students enrolled and absent, stratified by school district, school name, and grade. A name and unique identifier are provided for each school and district, as well as the level (eg, elementary, middle, high, alternative, other) and zip code of each school. Files are transmitted to the health department daily and include data from the previous school day. Public Health-Seattle & King County developed a series of visualizations that summarize the data by day, week, and month for each level of stratification. The automated system for collecting and monitoring school absenteeism data was more acceptable, simple, timely, complete, and useful relative to traditional manual data collection methods.

  14. Systemic Model for Optimal Regulation in Public Service

    Directory of Open Access Journals (Sweden)

    Lucica Matei

    2006-05-01

    Full Text Available The current paper inscribes within those approaching the issue of public services from the interdisciplinary perspective. Public service development and imposing standards of efficiency and effectiveness, as well as for citizens’ satisfaction bring in front line the systemic modelling and establishing optimal policies for organisation and functioning of public services. The issue under discussion imposes an interface with powerful determinations of social nature. Consequently, the most adequate modelling might be that with a probabilistic and statistic nature. The fundamental idea of this paper, that obviously can be broadly developed, starts with assimilating the way of organisation and functioning of a public service with a waiting thread, to which some hypotheses are associated concerning the order of provision, performance measurement through costs or waiting time in the system etc. We emphasise the openness and dynamics of the public service system, as well as modelling by turning into account the statistic knowledge and researches, and we do not make detailed remarks on the cybernetic characteristics of this system. The optimal adjustment is achieved through analysis on the feedback and its comparison with the current standards or good practices.

  15. Integrating child health information systems in public health agencies.

    Science.gov (United States)

    Bara, Debra; McPhillips-Tangum, Carol; Wild, Ellen L; Mann, Marie Y

    2009-01-01

    Public health agencies at state and local levels are integrating information systems to improve health outcomes for children. An assessment was conducted to describe the extent to which public health agencies are currently integrating child health information systems (CHIS). Using online technology information was collected, to assess completed and planned activities related to integration of CHIS, maturity of these systems, and factors that influence decisions by public health agencies to pursue integration activities. Of the 39 public health agencies that participated, 18 (46%) reported already integrating some or all of their CHIS, and 13 (33%) reported to be planning to integrate during the next 3 years. Information systems most commonly integrated include Early Hearing Detection and Intervention (EHDI), immunization, vital records, and Newborn Dried Bloodspot Screening (NDBS). Given the high priority that has been placed on using technology to improve health status in the United States, the emphasis on expanding the capability for the electronic exchange of health information, and federal support for electronic health records by 2014, public health agencies should be encouraged and supported in their efforts to develop, implement, and maintain integrated CHIS to facilitate the electronic exchange of health information with the clinical healthcare sector.

  16. MULTIPROCESSOR AND DISTRIBUTED PROCESSING BIBLIOGRAPHIC DATA BASE SOFTWARE SYSTEM

    Science.gov (United States)

    Miya, E. N.

    1994-01-01

    Multiprocessors and distributed processing are undergoing increased scientific scrutiny for many reasons. It is more and more difficult to keep track of the existing research in these fields. This package consists of a large machine-readable bibliographic data base which, in addition to the usual keyword searches, can be used for producing citations, indexes, and cross-references. The data base is compiled from smaller existing multiprocessing bibliographies, and tables of contents from journals and significant conferences. There are approximately 4,000 entries covering topics such as parallel and vector processing, networks, supercomputers, fault-tolerant computers, and cellular automata. Each entry is represented by 21 fields including keywords, author, referencing book or journal title, volume and page number, and date and city of publication. The data base contains UNIX 'refer' formatted ASCII data and can be implemented on any computer running under the UNIX operating system. The data base requires approximately one megabyte of secondary storage. The documentation for this program is included with the distribution tape, although it can be purchased for the price below. This bibliography was compiled in 1985 and updated in 1988.

  17. Understanding and Improving the Performance Consistency of Distributed Computing Systems

    NARCIS (Netherlands)

    Yigitbasi, M.N.

    2012-01-01

    With the increasing adoption of distributed systems in both academia and industry, and with the increasing computational and storage requirements of distributed applications, users inevitably demand more from these systems. Moreover, users also depend on these systems for latency and throughput sens

  18. A Wireless Distributed Condition Monitoring System Based on Bluetooth Technology

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Based on the discussion of bluetooth and network technology, this paper proposed an entire framework of a wireless distributed monitoring system by combining the characteristics of industry application. The feasibility of putting this kind of system in practice is discussed. The wireless distributed monitoring system can enhance the performance of condition monitoring more than the traditional one used now.

  19. Understanding and Improving the Performance Consistency of Distributed Computing Systems

    NARCIS (Netherlands)

    Yigitbasi, M.N.

    2012-01-01

    With the increasing adoption of distributed systems in both academia and industry, and with the increasing computational and storage requirements of distributed applications, users inevitably demand more from these systems. Moreover, users also depend on these systems for latency and throughput sens

  20. Public sector administration of ecological economics systems using mediated modeling.

    Science.gov (United States)

    van den Belt, Marjan; Kenyan, Jennifer R; Krueger, Elizabeth; Maynard, Alison; Roy, Matthew Galen; Raphael, Ian

    2010-01-01

    In today's climate of government outsourcing and multiple stakeholder involvement in public sector management and service delivery, it is more important than ever to rethink and redesign the structure of how policy decisions are made, implemented, monitored, and adapted to new realities. The traditional command-and-control approach is now less effective because an increasing amount of responsibility to deliver public goods and services falls on networks of nongovernment agencies. Even though public administrators are seeking new decision-making models in an increasingly more complex environment, the public sector currently only sparsely utilizes Mediated Modeling (MM). There is growing evidence, however, that by employing MM and similar tools, public interest networks can be better equipped to deal with their long-term viability while maintaining the short-term needs of their clients. However, it may require a shift in organizational culture within and between organizations to achieve the desired results. This paper explores the successes and barriers to implementing MM and similar tools in the public sector and offers insights into utilizing them through a review of case studies and interdisciplinary literature. We aim to raise a broader interest in MM and similar tools among public sector administrators at various administrative levels. We focus primarily, but not exclusively, on those cases operating at the interface of ecology and socio-economic systems.

  1. Distributed Impact Detector System (DIDS) Health Monitoring System Evaluation

    Science.gov (United States)

    Prosser, William H.; Madaras, Eric I.

    2010-01-01

    Damage due to impacts from micrometeoroids and orbital debris is one of the most significant on-orbit hazards for spacecraft. Impacts to thermal protection systems must be detected and the damage evaluated to determine if repairs are needed to allow safe re-entry. To address this issue for the International Space Station Program, Langley Research Center and Johnson Space Center technologists have been working to develop and implement advanced methods for detecting impacts and resultant leaks. LaRC funded a Small Business Innovative Research contract to Invocon, Inc. to develop special wireless sensor systems that are compact, light weight, and have long battery lifetimes to enable applications to long duration space structures. These sensor systems are known as distributed impact detection systems (DIDS). In an assessment, the NASA Engineering and Safety Center procured two prototype DIDS sensor units to evaluate their capabilities in laboratory testing and field testing in an ISS Node 1 structural test article. This document contains the findings of the assessment.

  2. Automated Energy Distribution and Reliability System: Validation Integration - Results of Future Architecture Implementation

    Energy Technology Data Exchange (ETDEWEB)

    Buche, D. L.

    2008-06-01

    This report describes Northern Indiana Public Service Co. project efforts to develop an automated energy distribution and reliability system. The purpose of this project was to implement a database-driven GIS solution that would manage all of the company's gas, electric, and landbase objects. This report is second in a series of reports detailing this effort.

  3. Java Technologies for Distributed Systems Based on Use of CORBA Architecture Oriented Middleware

    CERN Document Server

    Galaktionov, V V

    2002-01-01

    According to JINR Agreement with FZR (Rossendorf, Germany), author performed some investigations, concerning use of Java/CORBA technologies for creation of distributed information systems (in particular, based on access to relational data bases). Result of these researches (choice, analysis and practical testing of these technologies possibilities) is the main topic of this publication.

  4. Developing a performance measurement system for public research centres

    Directory of Open Access Journals (Sweden)

    Masella, C.

    2012-01-01

    Full Text Available This study aims at developing a performance measurement system (PMS for research and development (R&D activities carried out by public research centres. Public research institutions are characterized by multiple stakeholders with different needs, and the management of R&D activities requires balancing the multiple goals of different stakeholders. This characteristic is a key issue in the process of construction of the PMS. Empirical evidence is provided by an Italian public research centre, where the researchers carried out a project aimed to develop a PMS following action research principles. This project gave the possibility to researchers to interact with different stakeholders and integrate their different information needs in a comprehensive set of key performance indicators (KPIs. As a result, multidimensional framework for measuring R&D performance in a public research centre is proposed and a set of Key Performance Indicators is developed, suggesting implications for academics and practitioners.

  5. Day-Ahead Congestion Management in Distribution Systems through Household Demand Response and Distribution Congestion Prices

    DEFF Research Database (Denmark)

    Liu, Weijia; Wu, Qiuwei; Wen, Fushuan

    2014-01-01

    into balancing power might challenge the operation of electric distribution systems and cause congestions. This paper presents a distribution congestion price (DCP) based market mechanism to alleviate possible distribution system congestions. By employing the loca- tional marginal pricing (LMP) model......, the proposed DCPs are able to reflect the real congestion cost and further direct the schedule of the responses of electric demands. Based on the NordPool Spot market structure, the interactions between aggregators and the distribution system operator (DSO) are discussed, and the procedure for calculating DCPs...

  6. Reliability Evaluation of Distribution System Considering Sequential Characteristics of Distributed Generation

    Directory of Open Access Journals (Sweden)

    Sheng Wanxing

    2016-01-01

    Full Text Available In allusion to the randomness of output power of distributed generation (DG, a reliability evaluation model based on sequential Monte Carlo simulation (SMCS for distribution system with DG is proposed. Operating states of the distribution system can be sampled by SMCS in chronological order thus the corresponding output power of DG can be generated. The proposed method has been tested on feeder F4 of IEEE-RBTS Bus 6. The results show that reliability evaluation of distribution system considering the uncertainty of output power of DG can be effectively implemented by SMCS.

  7. An RTM based Distributed Simulation System for Guide Robot

    Directory of Open Access Journals (Sweden)

    Chen Peihua

    2013-10-01

    Full Text Available In order to enhance the robot system integration and development for guide robot, a distributed simulation system was developed in this study using RTM (Robot Technology Middleware technology, which is an open software platform for robot systems. The RT (robot technology system of an adapter, a controller and the robot, together with other CORBA objects, was developed to connect the graphical programing interface with 3D simulator to set up an RTM based distributed simulation system. Simultaneously, the application of the distributed simulation system also confirms the controlling of the real robot utilizing the RT system. The proposed distributed simulation system based on RTM can obviously accelerate the software component development as well as the system integration for guide robot, which will certainly lower the cost of the development of new robot application systems.

  8. Web Based Distributed Coastal Image Analysis System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This project develops Web based distributed image analysis system processing the Moderate Resolution Imaging Spectroradiometer (MODIS) data to provide decision...

  9. Licensed Shared Access System Possibilities for Public Safety

    Directory of Open Access Journals (Sweden)

    Kalle Lähetkangas

    2016-01-01

    Full Text Available We investigate the licensed shared access (LSA concept based spectrum sharing ideas between public safety (PS and commercial radio systems. While the concept of LSA has been well developed, it has not been thoroughly investigated from the public safety (PS users’ point of view, who have special requirements and also should benefit from the concept. Herein, we discuss the alternatives for spectrum sharing between PS and commercial systems. In particular, we proceed to develop robust solutions for LSA use cases where connections to the LSA system may fail. We simulate the proposed system with different failure models. The results show that the method offers reliable LSA spectrum sharing in various conditions assuming that the system parameters are set properly. The paper gives guidelines to set these parameters.

  10. Probabilistic analysis in normal operation of distribution system with distributed generation

    DEFF Research Database (Denmark)

    Villafafila-Robles, R.; Sumper, A.; Bak-Jensen, B.

    2011-01-01

    Nowadays, the incorporation of high levels of small-scale non-dispatchable distributed generation is leading to the transition from the traditional 'vertical' power system structure to a 'horizontally-operated' power system, where the distribution networks contain both stochastic generation...

  11. The Design of Power Distribution System for CYCIAE-100

    Institute of Scientific and Technical Information of China (English)

    GE; Tao; CAI; Hong-ru; LI; Zhen-guo

    2012-01-01

    <正>As an important component of CYCIAE-100, the power distribution system can be divided into four parts, i. e., RF system with a total power of 420 kW, water cooling system of 150 kW, vacuum system of 100 kW, and other devices with a total power of 450 kW. The design of power distribution system for CYCIAE-100 is based on three principles as listed below.

  12. Intelligent distributed voltage control system for smart grid application

    Energy Technology Data Exchange (ETDEWEB)

    Sajadi, Amirhossein [Warsaw Univ. of Technology (Poland); Ariatabar, Mitra [RWTH Aachen Univ. (Germany)

    2012-07-01

    Increasing penetration of the renewable energy source (RES) units in distribution networks particularly due to nonlinear and unpredictable nature of renewable units brings up new challenges in different aspects of electricity network, which leads to more complex power systems. Multi-agent system is consisting of agents which are capable to perceive environment that they are located in and to reacts with each other by communication infrastructure in order to achieve overall goals. In this paper an approach to control the voltage based on in the power distribution system is proposed and discussed. Therefore, a multi-agent system has been integrated with artificial intelligence to come up with fuzzy multi-agent based system. The proposed control scheme is deployed to a smart distribution system consisting distribution generation units, modelled in MATLAB/Simulink, to evaluate its effectiveness. The simulation results show how proposed system can regulate voltage in smart distribution feeders. (orig.)

  13. Communication infrastructure and data management for operating smart distribution systems

    NARCIS (Netherlands)

    Brunner, C.; Buchholz, B.M.; Gelfand, A.; Kamphuis, I.G.; Naumann, A.

    2012-01-01

    The enhancement of distribution networks into smart grids is based on three pillars: • Energy management on distribution level, • Distribution system automation, • Involvement of the consumers into the market for electricity by smart metering All these functions require an intensive exchange of

  14. Prototyping a Distributed Information Retrieval System That Uses Statistical Ranking.

    Science.gov (United States)

    Harman, Donna; And Others

    1991-01-01

    Built using a distributed architecture, this prototype distributed information retrieval system uses statistical ranking techniques to provide better service to the end user. Distributed architecture was shown to be a feasible alternative to centralized or CD-ROM information retrieval, and user testing of the ranking methodology showed both…

  15. Communication infrastructure and data management for operating smart distribution systems

    NARCIS (Netherlands)

    Brunner, C.; Buchholz, B.M.; Gelfand, A.; Kamphuis, I.G.; Naumann, A.

    2012-01-01

    The enhancement of distribution networks into smart grids is based on three pillars: • Energy management on distribution level, • Distribution system automation, • Involvement of the consumers into the market for electricity by smart metering All these functions require an intensive exchange of data

  16. Coordinated Optimization of Distributed Energy Resources and Smart Loads in Distribution Systems: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Rui; Zhang, Yingchen

    2016-08-01

    Distributed energy resources (DERs) and smart loads have the potential to provide flexibility to the distribution system operation. A coordinated optimization approach is proposed in this paper to actively manage DERs and smart loads in distribution systems to achieve the optimal operation status. A three-phase unbalanced Optimal Power Flow (OPF) problem is developed to determine the output from DERs and smart loads with respect to the system operator's control objective. This paper focuses on coordinating PV systems and smart loads to improve the overall voltage profile in distribution systems. Simulations have been carried out in a 12-bus distribution feeder and results illustrate the superior control performance of the proposed approach.

  17. Coordinated Optimization of Distributed Energy Resources and Smart Loads in Distribution Systems

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Rui; Zhang, Yingchen

    2016-11-14

    Distributed energy resources (DERs) and smart loads have the potential to provide flexibility to the distribution system operation. A coordinated optimization approach is proposed in this paper to actively manage DERs and smart loads in distribution systems to achieve the optimal operation status. A three-phase unbalanced Optimal Power Flow (OPF) problem is developed to determine the output from DERs and smart loads with respect to the system operator's control objective. This paper focuses on coordinating PV systems and smart loads to improve the overall voltage profile in distribution systems. Simulations have been carried out in a 12-bus distribution feeder and results illustrate the superior control performance of the proposed approach.

  18. Modeling interregional freight flow by distribution systems

    NARCIS (Netherlands)

    Davydenko, I.; Tavasszy, L.A.; Blois, C.J. de

    2013-01-01

    Distribution Centers with a warehousing function have an important influence on the flow of goods from production to consumption, generating substantial goods flow and vehicle movements. This paper extends the classical 4-step freight modeling framework with a logistics chain model, explicitly model

  19. Managing Distributed Systems with Smart Subscriptions

    Science.gov (United States)

    Filman, Robert E.; Lee, Diana D.; Swanson, Keith (Technical Monitor)

    2000-01-01

    We describe an event-based, publish-and-subscribe mechanism based on using 'smart subscriptions' to recognize weakly-structured events. We present a hierarchy of subscription languages (propositional, predicate, temporal and agent) and algorithms for efficiently recognizing event matches. This mechanism has been applied to the management of distributed applications.

  20. Modeling interregional freight flow by distribution systems

    NARCIS (Netherlands)

    Davydenko, I.; Tavasszy, L.A.; Blois, C.J. de

    2013-01-01

    Distribution Centers with a warehousing function have an important influence on the flow of goods from production to consumption, generating substantial goods flow and vehicle movements. This paper extends the classical 4-step freight modeling framework with a logistics chain model, explicitly

  1. Electrical power systems for distributed generation

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, T.A.; Huval, S.J. [Stewart & Stevenson Services, Inc., Houston, TX (United States)

    1996-12-31

    {open_quotes}Distributed Generation{close_quotes} has become the {open_quotes}buzz{close_quotes} word of an electric utility industry facing deregulation. Many industrial facilities utilize equipment in distributed installations to serve the needs of a thermal host through the capture of exhaust energy in a heat recovery steam generator. The electrical power generated is then sold as a {open_quotes}side benefit{close_quotes} to the cost-effective supply of high quality thermal energy. Distributed generation is desirable for many different reasons, each with unique characteristics of the product. Many years of experience in the distributed generation market has helped Stewart & Stevenson to define a range of product features that are crucial to most any application. The following paper will highlight a few of these applications. The paper will also examine the range of products currently available and in development. Finally, we will survey the additional services offered by Stewart & Stevenson to meet the needs of a rapidly changing power generation industry.

  2. Study on Preserving Public Security of Installing 22 kV Distribution Equipment on Pavements

    Science.gov (United States)

    Murata, Koichi; Oka, Keisuke; Uemura, Satoshi; Ariga, Yasuo

    To cope with restructuring of electricity market, application of 22kV distribution systems to areas with high load density, is promising. To expand them, it is important to install 22kV distribution equipment on pavements and lots without fences. On the other hand, the neutral grounding method is expected for the 22kV distribution equipment in terms of rationalization of insulation. In this case, one line-to-ground fault current will be large. Therefore, to make safety of people, it is essential to decrease the contact voltage. In this paper, we will perform the simulation of current distribution in the case of one line-to-ground fault and study the security of human from the viewpoint of both step voltage and contact voltage. We will also clarify that we can lower the contact voltage by grounding mutually insulated inner box and outer box separately. Then we will propose the improved grounding method.

  3. The integration of public health in European primary care systems.

    NARCIS (Netherlands)

    Kringos, D.S.; Bolibar, Y.; Bourgueil, T.; Cartier, T.; Dedeum, T.; Hasvold, A.; Hutchinson, M.; Lember, M.; Oleszczyk, D.; Rotar Pavlick, I.; Svab, P.; Tedeschi, A.; Wilson, S.; Wilm, A.; Windak, A.; Boerma, W.

    2010-01-01

    Background: A strong primary care (PC) system provides accessible, comprehensive care in an ambulatory setting on a continuous basis and by coordinated care processes. These features give PC the opportunity to play a key role in providing public health (PH) services to their practice population. Th

  4. The integration of public health in European primary care systems.

    NARCIS (Netherlands)

    Kringos, D.S.; Bolibar, Y.; Bourgueil, T.; Cartier, T.; Dedeum, T.; Hasvold, A.; Hutchinson, M.; Lember, M.; Oleszczyk, D.; Rotar Pavlick, I.; Svab, P.; Tedeschi, A.; Wilson, S.; Wilm, A.; Windak, A.; Boerma, W.

    2010-01-01

    Background: A strong primary care (PC) system provides accessible, comprehensive care in an ambulatory setting on a continuous basis and by coordinated care processes. These features give PC the opportunity to play a key role in providing public health (PH) services to their practice population. Th

  5. Incentives and Their Dynamics in Public Sector Performance Management Systems

    Science.gov (United States)

    Heinrich, Carolyn J.; Marschke, Gerald

    2010-01-01

    We use the principal-agent model as a focal theoretical frame for synthesizing what we know, both theoretically and empirically, about the design and dynamics of the implementation of performance management systems in the public sector. In this context, we review the growing body of evidence about how performance measurement and incentive systems…

  6. A geographic information system for local public health policy

    NARCIS (Netherlands)

    J.A. van Oers (Johannes Anna Maria)

    1993-01-01

    textabstractThis book deals with the development and use of a geographic information system for local public health policy. Health differences between populations in different geographical areas, large (countries) or small (city-neighbourhoods) have always been a challenge to epidemiologists and pol

  7. Strategic Information Systems Planning in Malaysian Public Universities

    Science.gov (United States)

    Ismail, Noor Azizi; Raja Mohd Ali, Raja Haslinda; Mat Saat, Rafeah; Hsbollah, Hafizah Mohamad

    2007-01-01

    Purpose: The paper's purpose is to investigate the current status, problems and benefits of strategic information systems planning implementation in Malaysian public universities. Design/methodology/approach: The study uses dual but mutually supportive strands of investigation, i.e. a questionnaire survey and interviews. Findings: Malaysian public…

  8. Predictors of Autism Enrollment in Public School Systems

    Science.gov (United States)

    Boswell, Katelyn; Zablotsky, Benjamin; Smith, Christopher

    2014-01-01

    With a number of disparities present in the diagnosis and treatment of children with autism spectrum disorders, the education system plays a crucial role in the provision of both these service elements. Based on school and federal census data, this article examines one state's public school autism enrollment and possible predictors of…

  9. Intelligent Public Transport System with Information Forensics and Security

    Directory of Open Access Journals (Sweden)

    Uma Nagaraj

    2011-08-01

    Full Text Available To increase the usability of a public transport system it needs to go under revolutionary changes in its operating procedure. It is an attempt to make this possible using recent computer technology, mobile computing advancements and Wi-Fi or GPRS.The Intelligent Public Transport Information System will be specifically developed for Commercial public Transport. In this System passenger can get information about all buses, routes, timings of buses and all stops in any particular route. This system includes two phases. One is for user and other for administrator. At user side, user can request for information about all buses, routes, timings of buses and all stops in any particular route using Wi-Fi or GPRS technology from his mobile or PDA. At administrator side, administrator can update, delete and insert information about all buses, routes, timings of buses, all stops in any particular route and helpline numbers. Administrator can have all rights about database operations .The administrator requires the authentication of smart card for addition or deletion of information from commercial public transport

  10. LPV Identification of a Heat Distribution System

    DEFF Research Database (Denmark)

    Trangbæk, K; Bendtsen, Jan Dimon

    2010-01-01

    This paper deals with incremental system identification of district heating systems to improve control performance. As long as various parameters, e.g. valve settings, are kept fixed, the dynamics of district heating systems can be approximated well by linear models; however, the dynamics change ...

  11. Microgrids and distributed generation systems: Control, operation, coordination and planning

    Science.gov (United States)

    Che, Liang

    Distributed Energy Resources (DERs) which include distributed generations (DGs), distributed energy storage systems, and adjustable loads are key components in microgrid operations. A microgrid is a small electric power system integrated with on-site DERs to serve all or some portion of the local load and connected to the utility grid through the point of common coupling (PCC). Microgrids can operate in both grid-connected mode and island mode. The structure and components of hierarchical control for a microgrid at Illinois Institute of Technology (IIT) are discussed and analyzed. Case studies would address the reliable and economic operation of IIT microgrid. The simulation results of IIT microgrid operation demonstrate that the hierarchical control and the coordination strategy of distributed energy resources (DERs) is an effective way of optimizing the economic operation and the reliability of microgrids. The benefits and challenges of DC microgrids are addressed with a DC model for the IIT microgrid. We presented the hierarchical control strategy including the primary, secondary, and tertiary controls for economic operation and the resilience of a DC microgrid. The simulation results verify that the proposed coordinated strategy is an effective way of ensuring the resilient response of DC microgrids to emergencies and optimizing their economic operation at steady state. The concept and prototype of a community microgrid that interconnecting multiple microgrids in a community are proposed. Two works are conducted. For the coordination, novel three-level hierarchical coordination strategy to coordinate the optimal power exchanges among neighboring microgrids is proposed. For the planning, a multi-microgrid interconnection planning framework using probabilistic minimal cut-set (MCS) based iterative methodology is proposed for enhancing the economic, resilience, and reliability signals in multi-microgrid operations. The implementation of high-reliability microgrids

  12. Multifractal Measure of Post Distribution in Post System

    Institute of Scientific and Technical Information of China (English)

    CHEN Li; HUANG Deng-shi

    2009-01-01

    In order to investigate the true post distribution in the whole society, microelasticity (MIE) and macroelasticity (MAE) were defined by regarding all posts as a system. On this basis, the method for measuring post distribution was proposed. Using the Legendre dual transformation between MIE and MAE to highlight the probabilities of different levels, the post distribution were analyzed hierarchically. The two-scale Cantor model verified that the multifractal measure is applicable to the post distribution evolution process.

  13. Architectural transformations in network services and distributed systems

    CERN Document Server

    Luntovskyy, Andriy

    2017-01-01

    With the given work we decided to help not only the readers but ourselves, as the professionals who actively involved in the networking branch, with understanding the trends that have developed in recent two decades in distributed systems and networks. Important architecture transformations of distributed systems have been examined. The examples of new architectural solutions are discussed. Content Periodization of service development Energy efficiency Architectural transformations in Distributed Systems Clustering and Parallel Computing, performance models Cloud Computing, RAICs, Virtualization, SDN Smart Grid, Internet of Things, Fog Computing Mobile Communication from LTE to 5G, DIDO, SAT-based systems Data Security Guaranteeing Distributed Systems Target Groups Students in EE and IT of universities and (dual) technical high schools Graduated engineers as well as teaching staff About the Authors Andriy Luntovskyy provides classes on networks, mobile communication, software technology, distributed systems, ...

  14. 10th International Symposium on Distributed Autonomous Robotic Systems

    CERN Document Server

    Mondada, Francesco; Correll, Nikolaus; Mermoud, Grégory; Egerstedt, Magnus; Hsieh, M; Parker, Lynne; Støy, Kasper

    2013-01-01

    Distributed robotics is a rapidly growing, interdisciplinary research area lying at the intersection of computer science, communication and control systems, and electrical and mechanical engineering. The goal of the Symposium on Distributed Autonomous Robotic Systems (DARS) is to exchange and stimulate research ideas to realize advanced distributed robotic systems. This volume of proceedings includes 43 original contributions presented at the Tenth International Symposium on Distributed Autonomous Robotic Systems (DARS 2010), which was held in November 2010 at the École Polytechnique Fédérale de Lausanne (EPFL), Switzerland. The selected papers in this volume are authored by leading researchers from Asia, Australia, Europa, and the Americas, thereby providing a broad coverage and perspective of the state-of-the-art technologies, algorithms, system architectures, and applications in distributed robotic systems. The book is organized into four parts, each representing one critical and long-term research thru...

  15. Secure Internet Voting System based on Public Key Kerberos

    Directory of Open Access Journals (Sweden)

    Hussein Khalid Abd-Alrazzq

    2012-03-01

    Full Text Available Electronic voting system is an important tool which allows voters to vote over the Internet without the geographical restrictions with considers important criteria in evaluating electronic voting schemes such as the mobility, democracy, and privacy. In this paper secure remote voting system has been presented. The proposed system uses public key Kerberos which is another form of traditional Kerberos as infrastructure deal with voters. The public key is used in all steps of Kerberos (not only in initial. The proposed system utilizes the advantages of threshold cryptography to prevent anyone to decrypt or sign the ballot alone without agreement all authorities, and use threshold blind signature to prevent discovers the vote or the identity of voter and protect the content of the ballot during casting and provide verifiable and discourages ballot buying.

  16. Corruption and innovation in the Albanian public procurement system

    Directory of Open Access Journals (Sweden)

    Reida Kashta

    2014-07-01

    The question marks that this paper raises are: what are the means used in the war against corruption in the public procurement field in Albania? Did they had any real impact or they just reshaped the ways of doing corruption? The main finding of this paper is that introduction of e-procurement system was one of the most appropriate means to fight corruption in Albania, because this system fixed one of the biggest problems of the Albanian Public Procurement system; lack of transparency. The electronic system is transparent, since it provides the increasing of information passing through it, and the most important, it enhances the responsibility in relations between the contracting authorities and economic operators, enabling a more effective and efficient use of the tax payers’ money.

  17. INTEGRATED TICKETING SYSTEM OF PUBLIC TRANSPORT IN JAKARTA VS VÄRMLAND, SWEDEN

    Directory of Open Access Journals (Sweden)

    Teguh Himawan Ronggosusanto

    2015-05-01

    Full Text Available The heightened mobility of people in the DKI Jakarta province and surrounding area requires balance of the development public transport services. One of service attributes in public transportation is ticketing system. Currently, the ticketing system in Jakarta needs to be improved and still not integrated. Therefore, the importance to develop and implement a new integrated ticketing system to increase the competitiveness and attractiveness of public transports. It also gives an opportunity to the operators in order to implement several of ticket prices. There are some of barriers that faced by operators in development a new integrated ticketing system such as; institutional issue, resources integration, and financial problems. In order to describe and analyze the development of a new integrated ticketing system, this thesis uses a qualitative research approach and five sources of evidence i.e. documentation, archival records, an interview, direct and participant observations through a survey using the form of questionnaires that distributed to the public transport users. Further, this study also uses the case of Värmlandstrafik AB as the comparative study and the theoretical basis of the new services development as an approach to assess the possibility of implement a new integrated ticketing system. It aims to investigate the ticketing system phenomenon using information and data observations as materials to analyze, explore, and provide depth explanation. By analyzing data from a survey of passengers, this study gave a description and explanation related the characteristic and the travel behavior of passenger, also an assessment of ticketing system that underlies the development a new integrated ticketing system. Then, using the comparative case study of Värmlandstrafik AB that already implement an integrated ticketing system and the self-services in provision of public transport services gave an analysis what needs to prepare for implement a

  18. Video upload from public transport vehicles using multihomed systems

    OpenAIRE

    Mellia, Marco; Safari Khatouni, Ali; Ajmone Marsan, Marco Giuseppe

    2016-01-01

    Abstract: We consider a surveillance system for public transport vehicles, which is based on the collection of on-board videos, and the upload via mobile network to a central security system of video segments corresponding to those cameras and time intervals involved in an accident. We assume that vehicles are connected to several wireless interfaces, provided by different Mobile Network Operators (MNOs), each charging a different cost. Both the cost and the upload rate for each network inter...

  19. Public Health Surveillance in Pilot Drinking Water Contamination Warning Systems

    OpenAIRE

    Dangel, Chrissy; Allgeier, Steven C.; Gibbons, Darcy; Haas, Adam

    2013-01-01

    Objective This paper describes the lessons learned from operation and maintenance of the public health surveillance (PHS) component of five pilot city drinking water contamination warning systems (CWS) including: Cincinnati, New York, San Francisco, Philadelphia, and Dallas. Introduction The U.S. Environmental Protection Agency (EPA) designed a program to pilot multi-component contamination warning systems (CWSs), known as the ?Water Security initiative (WSi).? The Cincinnati pilot has been f...

  20. Public engagement and the changing face of health system planning.

    Science.gov (United States)

    Grant, John; Sears, Nancy A; Born, Karen

    2008-01-01

    This paper examines the impact of the emerging citizens' assembly model of public engagement on health system planning and management. The characteristics that distinguish this model from more traditional approaches such as surveys and town hall meetings are elaborated using the case study of the recent Citizens' Regional Health Assembly. The paper concludes by suggesting the possibility of a new type of relationship between health system decision-makers, providers and the community.

  1. FIPA agent based network distributed control system

    CERN Document Server

    Gyurjyan, V; Heyes, G; Jastrzembski, E; Timmer, C; Wolin, E

    2003-01-01

    A control system with the capabilities to combine heteregeneous control systems or processes into a uniform homogeneous environment is discussed. This dynamically extensible system is an example of the software system at the agent level of abstraction. This level of abstraction considers agents as atomic entities that communicate to implement the functionality of the control system. Agents engineering aspects are addressed by adopting the domain independent software standard, formulated by FIPA. Jade core Java classes are used as a FIPA specification implementation. A special, lightweight, XML RDFS based, control oriented, ontology markup language is developed to standardize the description of the arbitrary control system data processor. Control processes, described in this language, are integrated into the global system at runtime, without actual programming. Fault tolerance and recovery issues are also addressed.

  2. FIPA agent based network distributed control system

    Energy Technology Data Exchange (ETDEWEB)

    D. Abbott; V. Gyurjyan; G. Heyes; E. Jastrzembski; C. Timmer; E. Wolin

    2003-03-01

    A control system with the capabilities to combine heterogeneous control systems or processes into a uniform homogeneous environment is discussed. This dynamically extensible system is an example of the software system at the agent level of abstraction. This level of abstraction considers agents as atomic entities that communicate to implement the functionality of the control system. Agents' engineering aspects are addressed by adopting the domain independent software standard, formulated by FIPA. Jade core Java classes are used as a FIPA specification implementation. A special, lightweight, XML RDFS based, control oriented, ontology markup language is developed to standardize the description of the arbitrary control system data processor. Control processes, described in this language, are integrated into the global system at runtime, without actual programming. Fault tolerance and recovery issues are also addressed.

  3. A support architecture for reliable distributed computing systems

    Science.gov (United States)

    Dasgupta, Partha; Leblanc, Richard J., Jr.

    1988-01-01

    The Clouds project is well underway to its goal of building a unified distributed operating system supporting the object model. The operating system design uses the object concept of structuring software at all levels of the system. The basic operating system was developed and work is under progress to build a usable system.

  4. Power Quality in DC Power Distribution Systems and Microgrids

    Directory of Open Access Journals (Sweden)

    Stephen Whaite

    2015-05-01

    Full Text Available This review paper discusses power quality considerations for direct current (DC electric power distribution systems, particularly DC microgrids. First, four selected sample DC architectures are discussed to provide motivation for the consideration of power quality in DC systems. Second, a brief overview of power quality challenges in conventional alternating current (AC distribution systems is given to establish the field of power quality. Finally, a survey of literature addressing power quality issues in DC systems is presented, and necessary power quality considerations in DC distribution system design and operation are discussed.

  5. Distributed Space Missions for Earth System Monitoring

    CERN Document Server

    2013-01-01

    A key addition to Springer's Space Technology Library series, this edited volume features the work of dozens of authors and offers a wealth of perspectives on distributed Earth observation missions. In sum, it is an eloquent synthesis of the fullest possible range of current approaches to a fast-developing field characterized by growing membership of the 'space club' to include nations formerly regarded as part of the Third World. The volume's four discrete sections focus on the topic's various aspects, including the key theoretical and technical issues arising from the division of payloads onto different satellites. The first is devoted to analyzing distributed synthetic aperture radars, with bi- and multi-static radars receiving separate treatment. This is followed by a full discussion of relative dynamics, guidance, navigation and control. Here, the separate topics of design; establishment, maintenance and control; and measurements are developed with relative trajectory as a reference point, while the dis...

  6. Distributed MIMO Systems with Oblivious Antennas

    CERN Document Server

    Simeone, Osvaldo; Poor, H Vincent; Shamai, Shlomo

    2008-01-01

    A scenario in which a single source communicates with a single destination via a distributed MIMO transceiver is considered. The source operates each of the transmit antennas via finite-capacity links, and likewise the destination is connected to the receiving antennas through capacity-constrained channels. Targeting a nomadic communication scenario, in which the distributed MIMO transceiver is designed to serve different standards or services, transmitters and receivers are assumed to be oblivious to the encoding functions shared by source and destination. Adopting a Gaussian symmetric interference network as the channel model (as for regularly placed transmitters and receivers), achievable rates are investigated and compared with an upper bound. It is concluded that in certain asymptotic and non-asymptotic regimes obliviousness of transmitters and receivers does not cause any loss of optimality.

  7. Distributed Rocket Engine Testing Health Monitoring System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Leveraging the Phase I achievements of the Distributed Rocket Engine Testing Health Monitoring System (DiRETHMS) including its software toolsets and system building...

  8. Distributed Rocket Engine Testing Health Monitoring System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The on-ground and Distributed Rocket Engine Testing Health Monitoring System (DiRETHMS) provides a system architecture and software tools for performing diagnostics...

  9. Distribution of Malaria Case in Simpenan Public Health Centre Sukabumi District in 2011

    Directory of Open Access Journals (Sweden)

    Hubullah Fuadzy

    2012-12-01

    Full Text Available The number of malaria in Simpenan public health centre area needs a quick step in the patients finding by malaria microscopic officers, both by Active Case Detection (ACD and Passive Case Detection (PCD. The objective of th is article is to determine the distribution of malaria cases at Simpenan public health centre in Sukabumi during 2011. Data collection was carried out by malaria officersfrom Simpenan public health centre by identifying malaria parasite with microscope to any gold miners who just got home and was having a highfever. Malaria cases during the year 2011 experienced an increasing trend (R2 = 0.0175 from January (8.86% to December (15.18%, 79 cases of malaria was found and the peak of cases happened in December. Malaria was notfound in the age group of 0-14 years, but cases ofmalaria were found in productive age group (15-44 years old = 83%, 45-59 years old = 14%, 2: 60 years old = 3%, and also to all people working as gold miners in malaria-endemic areas i.e. Aceh, Bangka, Jambi, Kalimantan, Medan, Papua, Riau, and Sumbawa. This indicated that malaria in Simpenan was predicted as import cases.

  10. RECONFIGURABLE RADIO SYSTEMS FOR PUBLIC SAFETY: NEW GENERATION OF PUBLIC SAFETY ICT

    OpenAIRE

    Baldini, Gianmarco; VERGARI Fabrizio

    2011-01-01

    Reconfigurable Radio Systems (RRS) is a subject which is becoming more and more interesting in that represents an affordable and effective solution to integrate the applications for first responders on Public Protection and Disaster Relief (PPDR). These End Users are more and more involved in operations of protection to people environment and properties and they address a large number of threats both natural and man-made, acts of terrorism, technological, radiological or environmental acciden...

  11. Analysis of distribution systems with a high penetration of distributed generation

    DEFF Research Database (Denmark)

    Lund, Torsten

    power alone can cover the entire load demand. The objective of the work is to investigate the influence of wind power and distributed combined heat and power production on the operation of the distribution systems. Where other projects have focused on the modeling and control of the generators and prime...... is on the representation of the network during and after a fault as a Thevenin equivalent voltage and impedance. The influence of adjacent synchronous generators, Danish concept wind turbines, SVCs and STATCOMs on the Thevenin parameters have been investigated. Thirdly, the problem of voltage and reactive power control...... movers, the focus of this project is on the operation of an entire distribution system with several wind farms and CHPs. Firstly, the subject of allocation of power system losses in a distribution system with distributed generation is treated. A new approach to loss allocation based on current injections...

  12. A generalization information management system applied to electrical distribution

    Energy Technology Data Exchange (ETDEWEB)

    Geisler, K.I.; Neumann, S.A.; Nielsen, T.D.; Bower, P.K. (Empros Systems International (US)); Hughes, B.A.

    1990-07-01

    This article presents a system solution approach that meets the requirements being imposed by industry trends and the electric utility customer. Specifically, the solution addresses electric distribution management systems. Electrical distribution management is a particularly well suited area of application because it involves a high diversity of tasks, which are currently supported by a proliferation of automated islands. Islands of automation which currently exist include (among others) distribution operations, load management, automated mapping, facility management, work order processing, and planning.

  13. An agile and cooperative architecture for distributed manufacturing systems

    OpenAIRE

    Leitão, Paulo; Restivo, Francisco

    2001-01-01

    World-wide competition among enterprises leads to the need for new systems to perform the control of distributed manufacturing systems, through the integration of information systems and self-organisation features, in order to adapt quickly to the environment changes. This paper presents an agile and cooperative architecture for distributed manufacturing systems based in the multiagent technology which implements some holonic and bionic concepts and supports a new control approach, including ...

  14. Architectural notes: a framework for distributed systems development

    NARCIS (Netherlands)

    Pires, L.F.; Ferreira Pires, Luis

    1994-01-01

    This thesis develops a framework of methods and techniques for distributed systems development. This framework consists of two related domains in which design concepts for distributed systems are defined: the entity domain and the behaviour domain. In the entity domain we consider structures of

  15. Protection issues on microgrid/distributed generation based systems

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Angelo R. [Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET-MG), Belo Horizonte, MG (Brazil); Ribeiro, Paulo F. [Calvin College, Grand Rapids, MI (United States). Dept. of Electrical Engineering; Iung, Anderson M. [Geracao Paranapanema S.A., SP (Brazil). Duke Energy International. Market Analysis Dept.; Garcia, Paulo A.N. [Federal University of Juiz de Fora (UFJF), MG (Brazil). Dept. of Circuits

    2009-07-01

    This paper aims to discuss protection issues related to the presence of distributed generation (DG) in distribution systems. A case study is developed to show some impacts of transitions and operations with relay static settings to verify the reliability of systems in the presence of DG. (author)

  16. An Applet-based Anonymous Distributed Computing System.

    Science.gov (United States)

    Finkel, David; Wills, Craig E.; Ciaraldi, Michael J.; Amorin, Kevin; Covati, Adam; Lee, Michael

    2001-01-01

    Defines anonymous distributed computing systems and focuses on the specifics of a Java, applet-based approach for large-scale, anonymous, distributed computing on the Internet. Explains the possibility of a large number of computers participating in a single computation and describes a test of the functionality of the system. (Author/LRW)

  17. Configuration of Distributed Message Converter Systems using Performance Modeling

    NARCIS (Netherlands)

    Aberer, Karl; Risse, Thomas; Wombacher, Andreas

    2001-01-01

    To find a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tools to analyse potential system configurations, howe

  18. Load flow computations in hybrid transmission - distributed power systems

    NARCIS (Netherlands)

    Wobbes, E.D.; Lahaye, D.J.P.

    2013-01-01

    We interconnect transmission and distribution power systems and perform load flow computations in the hybrid network. In the largest example we managed to build, fifty copies of a distribution network consisting of fifteen nodes is connected to the UCTE study model, resulting in a system consisting

  19. Multi-agent testbed for distributed space systems

    NARCIS (Netherlands)

    Osuman, A.; Guo, J.; Gill, E.K.A.

    2010-01-01

    Several industries are involved in the development of distributed systems, testbeds are needed to simulate the real world challenges that face the distributed systems. Presently, there are a number of testbeds in the world with very distinctive characteristics. Delft University of Technology is invo

  20. Distributed port-Hamiltonian formulation of infinite dimensional systems

    NARCIS (Netherlands)

    Macchelli, Alessandro; Schaft, van der Arjan J.; Melchiorri, Claudio

    2004-01-01

    In this paper, some new results concerning the modeling and control of distributed parameter systems in port Hamiltonian form are presented. The classical finite dimensional port Hamiltonian formulation of a dynamical system is generalized in order to cope with the distributed parameter and multi-va

  1. Distributed Port-Hamiltonian Formulation of Innite Dimensional Systems

    NARCIS (Netherlands)

    Macchelli, Alessandro; Schaft, Arjan J. van der; Melchiorri, Claudio

    2004-01-01

    In this paper, some new results concerning the modeling and control of distributed parameter systems in port Hamiltonian form are presented. The classical finite dimensional port Hamiltonian formulation of a dynamical system is generalized in order to cope with the distributed parameter and multi-va

  2. EBO feed water distribution system, experience gained from operation

    Energy Technology Data Exchange (ETDEWEB)

    Matal, O. [Energovyzkum, Brno (Switzerland); Schmidt, S.; Mihalik, M. [Atomove Elektrarne Bohunice, Jaslovske Bohunice (Switzerland)

    1997-12-31

    Advanced feed water distribution systems of the EBO design have been installed into steam generators at Units 3 and 4 of the NPP Jaslovske Bohunice (VVER 440). Experiences gained from the operation of steam generators with the advanced feed water distribution systems are discussed in the paper. (orig.). 4 refs.

  3. Analysis Model for Domestic Hot Water Distribution Systems: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Maguire, J.; Krarti, M.; Fang, X.

    2011-11-01

    A thermal model was developed to estimate the energy losses from prototypical domestic hot water (DHW) distribution systems for homes. The developed model, using the TRNSYS simulation software, allows researchers and designers to better evaluate the performance of hot water distribution systems in homes. Modeling results were compared with past experimental study results and showed good agreement.

  4. Critical systems for public health management of floods, North Dakota.

    Science.gov (United States)

    Wiedrich, Tim W; Sickler, Juli L; Vossler, Brenda L; Pickard, Stephen P

    2013-01-01

    Availability of emergency preparedness funding between 2002 and 2009 allowed the North Dakota Department of Health to build public health response capabilities. Five of the 15 public health preparedness capability areas identified by the Centers for Disease Control and Prevention in 2011 have been thoroughly tested by responses to flooding in North Dakota in 2009, 2010, and 2011; those capability areas are information sharing, emergency operations coordination, medical surge, material management and distribution, and volunteer management. Increasing response effectiveness has depended on planning, implementation of new information technology, changes to command and control procedures, containerized response materials, and rapid contract procedures. Continued improvement in response and maintenance of response capabilities is dependent on ongoing funding.

  5. A Fuzzy-Multiagent Service Restoration Scheme for Distribution System With Distributed Generation

    DEFF Research Database (Denmark)

    Elmitwally, Akram; Elsaid, Mohammed; Elgamal, Mohammed

    2015-01-01

    This paper proposes a new multiagent control system (MACS) for service restoration in distribution systems with integrated distributed generation (DG) units. First, the MACS detects and locates faults, then decides the optimal reconfiguration of the network for restoring de-energized loads...... reduces the possibilities of control system failures for a moderate communication network infrastructure. Full dynamic simulation model for evaluating the MACS is implemented....

  6. Parallel Algorithm Design on Some Distributed Systems

    Institute of Scientific and Technical Information of China (English)

    孙家昶; 张林波; 等

    1997-01-01

    Some testing results on DAWINING-1000,Paragon and workstation cluster are described in this paper.On the home-made parallel system DAWNING-1000 with 32 computational processors,the practical performance of 1.1777 Gflops and 1.58 Gflops has been measured in solving a dense linear system and doing matrix multiplication,respectively .The scalability is also investigated.The importance of designing efficient parallel algorithms for evaluating parallel systems is emphasized.

  7. The new system of public registers in the Czech Republic

    Directory of Open Access Journals (Sweden)

    Michael Stencl

    2010-04-01

    Full Text Available This paper discusses the basic principles of data-sharing as defined in the Basic RegistryAct, No. 111/2009 Coll. Basic registers of public administration should become a new source of data for public authorities and for private entities. Authors describe the architecture of the basic registers’ system and discuss some possible technical solutions for each of the four basic registries (Registry of Inhabitants, Registry of Persons, Registry of Territorial Identification, Registry of Rights and Obligations. Special interest is put on the management of access permissions and the rules for providing the data to various clients.

  8. Battery management system with distributed wireless sensors

    Science.gov (United States)

    Farmer, Joseph C.; Bandhauer, Todd M.

    2016-02-23

    A system for monitoring parameters of an energy storage system having a multiplicity of individual energy storage cells. A radio frequency identification and sensor unit is connected to each of the individual energy storage cells. The radio frequency identification and sensor unit operates to sense the parameter of each individual energy storage cell and provides radio frequency transmission of the parameters of each individual energy storage cell. A management system monitors the radio frequency transmissions from the radio frequency identification and sensor units for monitoring the parameters of the energy storage system.

  9. Volt/VAr Optimization of Distribution System with Integrated Distributed Generation

    Directory of Open Access Journals (Sweden)

    MARIAM MUGHEES

    2017-01-01

    Full Text Available This paper addresses the issues of VVO (Volt/VAr Optimization such as loss minimization, acceptable voltage profiles and optimized number of switching operations. Basic function of the DMS (Distribution Management System is to upgrade system intelligence so that it can make dynamic decisions and control the network in realtime. Distributed generators can cause the system to operate above and below the desired limits due to their variable nature. Therefore, devices like SC (Shunt Capacitors and OLTC (On Load Tap Changers are used in distribution system as control devices. Main focus of this paper is to inspect effects of DG (Distributed Generation on switching states of control devices while considering Volt/VAr standards. An optimization search algorithm is employed to search the optimal solution considering the system constraints. The GA (Genetic Algorithm is used for the optimization process of the system and the simulation is done in MATLAB using IEEE-30 bus system with DG under 24 hour changing load profiles. By setting up constraints of distribution system?s voltage limits, capacitor bank and OLTC, losses are minimized up to 50%. Merits of the proposed optimized method are demonstrated through simulation results .The result achieved from the proposed technique has proven to be beneficial for switching optimization of control devices under variant conditions of loads and distributed generation

  10. 11th International Symposium on Distributed Autonomous Robotic Systems

    CERN Document Server

    Chirikjian, Gregory

    2014-01-01

    Distributed robotics is a rapidly growing and maturing interdisciplinary research area lying at the intersection of computer science, network science, control theory, and electrical and mechanical engineering. The goal of the Symposium on Distributed Autonomous Robotic Systems (DARS) is to exchange and stimulate research ideas to realize advanced distributed robotic systems. This volume of proceedings includes 31 original contributions presented at the 2012 International Symposium on Distributed Autonomous Robotic Systems (DARS 2012) held in November 2012 at the Johns Hopkins University in Baltimore, MD USA. The selected papers in this volume are authored by leading researchers from Asia, Europa, and the Americas, thereby providing a broad coverage and perspective of the state-of-the-art technologies, algorithms, system architectures, and applications in distributed robotic systems. The book is organized into five parts, representative of critical long-term and emerging research thrusts in the multi-robot com...

  11. An energy internet-based distribution system morphology

    Science.gov (United States)

    Yi, W.; Wang, P.; Hu, X. W.; Wang, X. N.; Shi, F.

    2017-06-01

    The future power distribution system will play an important role in the future energy system - energy Internet. With an eye to the diversification of energy and power fusion to the distribution system form, the prospect of the future integrated power distribution system for energy Internet is proposed, from the three aspects of structure, equipment form and industrial form: a multi-level AC-DC ring network as a framework, including the P2P interconnection and DC information satisfied power grid integrated network structure, is given; the concept of energy exchanger, the concept of energy server is put forward, and on this basis, the future distribution system of the equipment is prospected; the future distribution of the three types of industrial forms is analysed.

  12. Hierarchies of Alarms for Large Distributed Systems

    CERN Document Server

    Boccioli, M; Martos, V; Holme, O

    2014-01-01

    The control systems of most of the infrastructure at CERN make use of the SCADA package WinCC Open Architecture by ETM*, including successful projects to control large scale systems such as the Large Hadron Collider (LHC) accelerator and associated experiments.).

  13. Monitoring Distributed Systems: A Relational Approach.

    Science.gov (United States)

    1982-12-01

    Feldman&Rovner 69]. Recently, several graphics systems employing a relational data base have been implemented [ Becerril et al. 79, Williams 74, Herot 80...Intelligent Gateway: System Overview. IEEE Transactions on Software Engineering SE-2(4), December, 1976. [ Becerril et al. 79] J. Becerril , R

  14. Directions in avionic data distribution systems

    Energy Technology Data Exchange (ETDEWEB)

    Wilent, C.E.

    1983-01-01

    The author examines the requirements for data distribution resulting from trends in avionic architecture and the opportunities for lower costs afforded by advancing technology. VLSI technology is providing the opportunity for the development of powerful processing components, the application of which addresses both problems. The concept of time-multiplexing programmable preprocessors, signal, and data processors, which is being explored in programs such as ICNIA, potentially reduces total hardware and provides additional benefits of fault tolerance and graceful degradation. The result is a matrix architecture in which processing tasks are partitioned by signal bandwidth and executed with temporarily assigned strings of processor elements.

  15. Optimal distribution of incentives for public cooperation in heterogeneous interaction environments

    Directory of Open Access Journals (Sweden)

    Xiaojie eChen

    2014-07-01

    Full Text Available In the framework of evolutionary games with institutional reciprocity, limited incentives are at disposal for rewarding cooperators and punishing defectors. In the simplest case, it can be assumed that, depending on their strategies, all players receive equal incentives from the common pool. The question arises, however, what is the optimal distribution of institutional incentives? How should we best reward and punish individuals for cooperation to thrive? We study this problem for the public goods game on a scale-free network. We show that if the synergetic effects of group interactions are weak, the level of cooperation in the population can be maximized simply by adopting the simplest ''equal distribution'' scheme. If synergetic effects are strong, however, it is best to reward high-degree nodes more than low-degree nodes. These distribution schemes for institutional rewards are independent of payoff normalization. For institutional punishment, however, the same optimization problem is more complex, and its solution depends on whether absolute or degree-normalized payoffs are used. We find that degree-normalized payoffs require high-degree nodes be punished more lenient than low-degree nodes. Conversely, if absolute payoffs count, then high-degree nodes should be punished stronger than low-degree nodes.

  16. Marketing Promotion and Distribution of Project within Private and Public Sphere

    Directory of Open Access Journals (Sweden)

    Rastislav Kerul

    2008-06-01

    Full Text Available The topic of marketing implementation within project management is out of interest of many authors. There are a few literature sources related to the theme. Our science interest is to analyze and outline the main possibilities of marketing conception implementation within project realization in order to make their distribution and promotion effective to reach the target groups and publics. We try to describe main basis of marketing perspective in managing projects in relation to target groups, to which the project would be defined and it would reach it directly or indirectly. The main aim of the study is to analyze the possibilities of project preparation and implementation with the support of direct and effective marketing mix with emphasis on promotion and distribution policy. The project would be seen as a product within this marketing mix and the price is not considered to be that interesting as it is given by the national law and concrete priority call. The communication policy as well as distribution strategy must be designed in relation to expectations and needs of target groups which might vary in their age, sex, life standard, demography characteristics, etc.

  17. State and National Water Fluoridation System (Public Water Systems)

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Water Fluoridation Reporting System (WFRS) has been developed to provide tools to assist states in managing fluoridation programs. WFRS is designed to track all...

  18. Power Capability in Low Voltage DC Distribution Systems

    Directory of Open Access Journals (Sweden)

    C.O. Gecan

    2009-12-01

    Full Text Available Recent developments in power electronics components enable the use of power electronics in Low Voltage (LV networks. This development makes the model of a Low Voltage Direct Current (LVDC distribution system possible. The technical and economical benefits of this technology make possible the alternative hypothesis of using DC instead of AC distribution systems. Some aspects, such as increasing the capability of the existing lines, interconnecting distributed generation units and even supplying in DC some loads are creating additional requirements of using a LVDC distribution system. The paper presents some general considerations regarding cables used in a LVAC distribution system and different line reconfigurations witch enable the use of cobles in a LVDC distribution system. The reconfigurations are presented in respect of the DC network topologies: unipolar and bipolar. The central aim of this paper is to investigate capability of power transmission and to calculate the transmission distance for cables used in Low Voltage AC and DC distribution systems. Capability computation is considered in respect of two constrains imposed in the cables cross section selection: cable thermal limit and the maximum allowable voltage drop. Cable thermal limit is represented in calculations by the maximum rated current. The equations used to calculate the power capability are presented for single-phase and threephase AC networks and unipolar and bipolar DC networks. Based on these equations, comparisons between power capability of cables with different cross sections used in Low Voltage DC and AC distribution systems are realized and presented.

  19. Assessment on reliability of water quality in water distribution systems

    Institute of Scientific and Technical Information of China (English)

    伍悦滨; 田海; 王龙岩

    2004-01-01

    Water leaving the treatment works is usually of a high quality but its properties change during the transportation stage. Increasing awareness of the quality of the service provided within the water industry today and assessing the reliability of the water quality in a distribution system has become a major significance for decision on system operation based on water quality in distribution networks. Using together a water age model, a chlorine decay model and a model of acceptable maximum water age can assess the reliability of the water quality in a distribution system. First, the nodal water age values in a certain complex distribution system can be calculated by the water age model. Then, the acceptable maximum water age value in the distribution system is obtained based on the chlorine decay model. The nodes at which the water age values are below the maximum value are regarded as reliable nodes. Finally, the reliability index on the percentile weighted by the nodal demands reflects the reliability of the water quality in the distribution system. The approach has been applied in a real water distribution network. The contour plot based on the water age values determines a surface of the reliability of the water quality. At any time, this surface is used to locate high water age but poor reliability areas, which identify parts of the network that may be of poor water quality. As a result, the contour water age provides a valuable aid for a straight insight into the water quality in the distribution system.

  20. Underfrequency Load Shedding for an Islanded Distribution System With Distributed Generators

    DEFF Research Database (Denmark)

    Mahat, Pukar; Chen, Zhe; Bak-Jensen, Birgitte

    2010-01-01

    Significant penetration of distributed generation in many distribution systems has opened an option of operating distribution systems in island mode for economical and technical reasons. However, balancing frequency of the islanded system is still an issue to be solved, especially when the demand...... exceeds the generation in the power island. This paper presents a strategy to shed an optimal number of loads in the island to stabilize the frequency. The load shedding strategy is based on frequency information, rate of change of frequency, customers' willingness to pay, and loads histories. Different...