Sample records for open distributed systems

  1. Quasiprobability distributions in open quantum systems: spin-qubit systems

    E-print Network

    Kishore Thapliyal; Subhashish Banerjee; Anirban Pathak; S. Omkar; V. Ravishankar

    2015-04-08

    Quasiprobability distributions (QDs) in open quantum systems are investigated for $SU(2)$, spin like systems, having relevance to quantum optics and information. In this work, effect of both quantum non-demolition (QND) and dissipative open quantum systems, on the evolution of a number of spin QDs are investigated. Specifically, compact analytic expressions for the $W$, $P$, $Q$, and $F$ functions are obtained for some interesting single, two and three qubit states, undergoing general open system evolutions. Further, corresponding QDs are reported for an N qubit Dicke model and a spin-1 system. The existence of nonclassical characteristics are observed in all the systems investigated here. The study leads to a clear understanding of quantum to classical transition in a host of realistic physical scenarios. Variation of the amount of nonclassicality observed in the quantum systems, studied here,are also investigated using nonclassical volume.

  2. Reasoning about Meta Level Activities in Open Distributed Systems

    E-print Network

    Venkatasubramanian, Nalini

    Reasoning about Meta Level Activities in Open Distributed Systems Nalini Venkatasubramanian Hewlett]. Representation of dependability protocols as meta­level programs is presented in [4]. Some of the more recent Approach Open distributed systems should provide strong support for customization and adaptation. Non­reflective

  3. Identifying Open Problems in Distributed Systems Andrew Warfield, Yvonne Coady, and Norm Hutchinson

    E-print Network

    Warfield, Andrew

    Identifying Open Problems in Distributed Systems Andrew Warfield, Yvonne Coady, and Norm Hutchinson distributed applications are more apparent than ever. Opportunities are emerging to develop large systems this emerging class of distributed system can become a reality. 1 Introduction Distributed systems research has

  4. MOVIE Model for Open Systems Based High Performance Distributed Computing

    Microsoft Academic Search

    Chris Faiglet; Wojtek Furmanski; Tomasz Haupt; Janusz Niemiect; Marek Podgorny; Diglio A. Simoni

    1992-01-01

    MOVIE (Multitasking Object-oriented Visual Interactive Environment) is the new software system for HighPerformance Distributed Computing (HPDC), currently in the advanced design and implementation stage at NortheastParallel Architectures Center (NPAC), Syracuse University. MOVIE System is structured as a multiserver network ofinterpreters of high-level object-oriented programming language MovieScript. MovieScript derives from PostScript andextends it in the C++ syntax based object--oriented ...

  5. Integrated Network Security Protocol Layer for Open-Access Power Distribution Systems

    Microsoft Academic Search

    Todd Mander; Farhad Nabhani; Lin Wang; Richard Cheung

    2007-01-01

    Power distribution system cyber-security concerns are increasing rapidly with growing demands for open accesses to the distribution systems for electricity generation and trading imposed by new government deregulations. This paper proposes a new integrated network security protocol layer, located below the data-link layer of DNP3 - a popular utility protocol, to enhance the data transmission cyber-security for power distribution systems.

  6. Modeling and simulation for performance estimation of open distributed energy management systems

    SciTech Connect

    Horiike, S.; Okazaki, Y. [Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan). Industrial Systems Lab.] [Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan). Industrial Systems Lab.

    1996-02-01

    This paper describes a performance estimation tool developed for modeling and simulation of open distributed energy management systems to support their design. The approach of discrete event simulation with detailed models is considered for efficient performance estimation. The tool includes basic models constituting a platform, e.g., Ethernet, communication protocol, operating system, etc. Application softwares are modeled by specifying CPU time, disk access size, communication data size, etc. Different types of system configurations for various system activities can be easily studied. Simulation examples show how the tool is utilized for the efficient design of open distributed energy management systems.

  7. Modeling and simulation for performance estimation of open distributed energy management systems

    SciTech Connect

    Horiike, S.; Okazaki, Y. [Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan). Industrial Systems Lab.

    1995-12-31

    This paper describes a performance estimation tool developed for modeling and simulation of open distributed energy management systems to support their design. The approach of discrete event simulation with detailed models is considered for efficient performance estimation. The tool includes basic models constituting a platform, e.g., Ethernet, communication protocol, operating system, etc. Application softwares are modeled by specifying CPU time, disk access size, communication data size, etc. Different types of system configurations for various system activities can be easily studied. Simulation examples show how the tool is utilized for the efficient design of open distributed energy management systems.

  8. Intelligent mechatronic components: control system engineering using an open distributed architecture

    Microsoft Academic Search

    V. Vyatkin

    2003-01-01

    This paper reports the results of case study on application of open distributed software architecture IEC61499 to the organization of intelligence, embedded to smart mechatronic components. The presented approach targets the issues related to integration and reconfiguration of automation systems, where the software integration plays an important role. Based on the testbed studies, a classification of \\

  9. Supporting Location-Awareness in Open Distributed Systems

    Microsoft Academic Search

    Ulf Leonhardt

    1998-01-01

    Mobile computers and communication devices are establishing themselves as ubiquitousfeatures of daily life. This development is linked to tremendous growth in thenumber and sophistication of mobile and mobile-aware software applications. Increasingly,such applications need access to information about their own and other objects'physical locations, a requirement known as location-awareness.Existing location-aware applications and systems are typically tailored to a particulartype of...

  10. Integrated Two-Level Computer Network Architecture For Open-Access Distribution Systems

    Microsoft Academic Search

    Helen Cheung; Alexander Hamlyn; Todd Mander; Lin Wang; Cungang Yang; Richard Cheung

    2007-01-01

    Recently increased use of network-enabled devices in power systems, rapid development of distributed generations from alternate energy resources, and government-imposed open access competition have resulted utilities in greater reliance on computer networks for proper power grid operations. The focus of this paper is to propose a new two-level architecture for power-grid computer networks and to strength the network security. A

  11. Two-level network architecture for open-access power systems with distributed generations

    Microsoft Academic Search

    Helen Cheung; Lin Wang; Alexander Hamlyn; Frank Chen; Cungang Yang; Richard Cheung

    2008-01-01

    Recently increased use of network-enabled devices in power systems, rapid development of distributed generations from renewable energy resources, and government-imposed open access competition have resulted utilities in greater reliance on computer networks for proper power grid operations. This paper proposes a new two-level architecture for power-grid computer networks and to strength the networks' security. A new network access control strategy

  12. Open Data, Open Specifications and Free and Open Source Software: A powerful mix to create distributed Web-based water information systems

    NASA Astrophysics Data System (ADS)

    Arias, Carolina; Brovelli, Maria Antonia; Moreno, Rafael

    2015-04-01

    We are in an age when water resources are increasingly scarce and the impacts of human activities on them are ubiquitous. These problems don't respect administrative or political boundaries and they must be addressed integrating information from multiple sources at multiple spatial and temporal scales. Communication, coordination and data sharing are critical for addressing the water conservation and management issues of the 21st century. However, different countries, provinces, local authorities and agencies dealing with water resources have diverse organizational, socio-cultural, economic, environmental and information technology (IT) contexts that raise challenges to the creation of information systems capable of integrating and distributing information across their areas of responsibility in an efficient and timely manner. Tight and disparate financial resources, and dissimilar IT infrastructures (data, hardware, software and personnel expertise) further complicate the creation of these systems. There is a pressing need for distributed interoperable water information systems that are user friendly, easily accessible and capable of managing and sharing large volumes of spatial and non-spatial data. In a distributed system, data and processes are created and maintained in different locations each with competitive advantages to carry out specific activities. Open Data (data that can be freely distributed) is available in the water domain, and it should be further promoted across countries and organizations. Compliance with Open Specifications for data collection, storage and distribution is the first step toward the creation of systems that are capable of interacting and exchanging data in a seamlessly (interoperable) way. The features of Free and Open Source Software (FOSS) offer low access cost that facilitate scalability and long-term viability of information systems. The World Wide Web (the Web) will be the platform of choice to deploy and access these systems. Geospatial capabilities for mapping, visualization, and spatial analysis will be important components of these new generation of Web-based interoperable information systems in the water domain. The purpose of this presentation is to increase the awareness of scientists, IT personnel and agency managers about the advantages offered by the combined use of Open Data, Open Specifications for geospatial and water-related data collection, storage and sharing, as well as mature FOSS projects for the creation of interoperable Web-based information systems in the water domain. A case study is used to illustrate how these principles and technologies can be integrated to create a system with the previously mentioned characteristics for managing and responding to flood events.

  13. A distributed database system for sharing geological information using free and open source software

    NASA Astrophysics Data System (ADS)

    Nemoto, T.; Masumoto, S.; Nonogaki, S.; Raghavan, V.

    2013-12-01

    Recently, geological information, such as borehole data and geological maps, and seismic, volcanic or landslide hazard maps are published on the Internet by the national government, local governments, and research institutes in Japan. Most web systems that deliver such geological information consist of a centralized database, which are located and maintained in one location. It is easier to manage the centralized database system because all data resides in a single location. However, if the database breaks, the web service will not be available. In the present study, a distributed database system has been developed to continue delivering geological information even if a database breaks. The distributed database system has an advantage that the system remains available although an individual database is down. All the software used to construct the system is free and open source software. PostgreSQL and pgpool-II are utilized to construct a distributed database. PostgreSQL is a powerful relational database management system. Pgpool-II has a function for management of multiple PostgreSQL servers. OpenLayers is used for the web map clients. Replication and Parallel query modes with pgpool-II are utilized for distribution of a database. It is possible to create a real-time backup on 2 or more PostgreSQL clusters by replication mode. If a database breaks, the backup database will works to continue delivering geological information. Data can be split among multiple servers by using parallel query mode. The rules to send partitioned data to an appropriate cluster are contained in the System Database. If large-scale data is searched, the overall execution time will be reduced. The prototype for sharing 1500 borehole data has been successfully implemented by combination of PostgreSQL and pgpool-II on Linux server. Further development and improvement of the system are necessary to manage and analyze various spatial data in addition to borehole data. This study was supported by KAKENHI (24700096, 25330134; Grant-in-Aid for Scientific Research by Japan Society for Promotion of Science).

  14. Implications of an open, extensible, and distributed hypermedia information system architecture for interprocess communication subsystem design 

    E-print Network

    Nuernberg, Peter John

    1994-01-01

    Openness It is clear that openness is a core requirement for future hypermedia system architectures [Leggett and Schnase 1994; Malcolm et al. 1991; Pearl 1989]. According to Malcolm et al. [1991], users of hypermedia systems "must be able to access... HRLT IPCSS 101 LIST OF FIGURES Figure 1. OSI Reference Model Page 21 2. A hypermedia system taxonomy 3. Generic information system process 23 30 4. Information system, 5. Current architectural design terminology 31 36 6. Message structure...

  15. The Earth System Grid Federation: An Open Infrastructure for Access to Distributed Geospatial Data

    SciTech Connect

    Ananthakrishnan, Rachana [Argonne National Laboratory (ANL); Bell, Gavin [Lawrence Livermore National Laboratory (LLNL); Cinquini, Luca [Jet Propulsion Laboratory, Pasadena, CA; Crichton, Daniel [Jet Propulsion Laboratory, Pasadena, CA; Danvil, Sebastian [Institut Pierre Simon Laplace (IPSL), Des Sciences de L'Environnement; Drach, Bob [Lawrence Livermore National Laboratory (LLNL); Fiore, Sandro [Euro-Mediterranean Center on Climate Change; Gonzalez, Estanislao [German Climate Computing Center; Harney, John F [ORNL; Mattmann, Chris [Jet Propulsion Laboratory, Pasadena, CA; Kershaw, Philip [STFC Rutherford Appleton Laboratory, NCAS/BADC; Miller, Neill [Argonne National Laboratory (ANL); Morgan, Mark [Institut Pierre Simon Laplace (IPSL), Des Sciences de L'Environnement; Pascoe, Stephen [STFC Rutherford Appleton Laboratory, NCAS/BADC; Schweitzer, Roland [Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration; Shipman, Galen M [ORNL; Wang, Feiyi [ORNL

    2013-01-01

    The Earth System Grid Federation (ESGF) is a multi-agency, international collaboration that aims at developing the software infrastructure needed to facilitate and empower the study of climate change on a global scale. The ESGF s architecture employs a system of geographically distributed peer nodes, which are independently administered yet united by the adoption of common federation protocols and application programming interfaces (APIs). The cornerstones of its interoperability are the peer-to-peer messaging that is continuously exchanged among all nodes in the federation; a shared architecture and API for search and discovery; and a security infrastructure based on industry standards (OpenID, SSL, GSI and SAML). The ESGF software is developed collaboratively across institutional boundaries and made available to the community as open source. It has now been adopted by multiple Earth science projects and allows access to petabytes of geophysical data, including the entire model output used for the next international assessment report on climate change (IPCC-AR5) and a suite of satellite observations (obs4MIPs) and reanalysis data sets (ANA4MIPs).

  16. The Earth System Grid Federation: An Open Infrastructure for Access to Distributed Geo-Spatial Data

    SciTech Connect

    Cinquini, Luca [Jet Propulsion Laboratory, Pasadena, CA; Crichton, Daniel [Jet Propulsion Laboratory, Pasadena, CA; Miller, Neill [Argonne National Laboratory (ANL); Mattmann, Chris [Jet Propulsion Laboratory, Pasadena, CA; Harney, John F [ORNL; Shipman, Galen M [ORNL; Wang, Feiyi [ORNL; Bell, Gavin [Lawrence Livermore National Laboratory (LLNL); Drach, Bob [Lawrence Livermore National Laboratory (LLNL); Ananthakrishnan, Rachana [Argonne National Laboratory (ANL); Pascoe, Stephen [STFC Rutherford Appleton Laboratory, NCAS/BADC; Kershaw, Philip [STFC Rutherford Appleton Laboratory, NCAS/BADC; Gonzalez, Estanislao [German Climate Computing Center; Fiore, Sandro [Euro-Mediterranean Center on Climate Change; Schweitzer, Roland [Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration; Danvil, Sebastian [Institut Pierre Simon Laplace (IPSL), Des Sciences de L'Environnement; Morgan, Mark [Institut Pierre Simon Laplace (IPSL), Des Sciences de L'Environnement

    2012-01-01

    The Earth System Grid Federation (ESGF) is a multi-agency, international collaboration that aims at developing the software infrastructure needed to facilitate and empower the study of climate change on a global scale. The ESGF s architecture employs a system of geographically distributed peer nodes, which are independently administered yet united by the adoption of common federation protocols and application programming interfaces (APIs). The cornerstones of its interoperability are the peer-to-peer messaging that is continuously exchanged among all nodes in the federation; a shared architecture and API for search and discovery; and a security infrastructure based on industry standards (OpenID, SSL, GSI and SAML). The ESGF software is developed collaboratively across institutional boundaries and made available to the community as open source. It has now been adopted by multiple Earth science projects and allows access to petabytes of geophysical data, including the entire model output used for the next international assessment report on climate change (IPCC-AR5) and a suite of satellite observations (obs4MIPs) and reanalysis data sets (ANA4MIPs).

  17. Development of an Open Source GIS based Distributed Hydrological model System - MWEasyDHM

    Microsoft Academic Search

    Xiaohui Lei; Yuhui Wang; Yunzhong Jiang; Hao Wang; Yu Tian; Weihong Liao

    2010-01-01

    Spatially distributed hydrological model is an important tool for studying the hydrological cycle, making flood forecasting, simulating environmental and ecological processes and estimating crop water demand and so on. Successful distributed hydrological model and systems have been further achieved in many developed countries. However, there needs one GIS based Distributed Hydrological Model system to carry out hydrological simulation suitable for

  18. Guest Editors' Introduction: Selected papers from Middleware'98: The IFIP International Conference on Distributed Systems - Platforms and Open Distributed Processing

    Microsoft Academic Search

    Nigel Davies; Kerry Raymond; Gordon S. Blair

    1999-01-01

    In recent years the distributed systems community has witnessed a growth in the number of conferences, leading to difficulties in tracking the literature and a consequent loss of awareness of work done by others in this important research domain. In an attempt to synthesize many of the smaller workshops and conferences in the field, and to bring together research communities

  19. Wigner distribution function and entropy of the damped harmonic oscillator within the theory of the open quantum systems

    NASA Technical Reports Server (NTRS)

    Isar, Aurelian

    1995-01-01

    The harmonic oscillator with dissipation is studied within the framework of the Lindblad theory for open quantum systems. By using the Wang-Uhlenbeck method, the Fokker-Planck equation, obtained from the master equation for the density operator, is solved for the Wigner distribution function, subject to either the Gaussian type or the delta-function type of initial conditions. The obtained Wigner functions are two-dimensional Gaussians with different widths. Then a closed expression for the density operator is extracted. The entropy of the system is subsequently calculated and its temporal behavior shows that this quantity relaxes to its equilibrium value.

  20. MOVIE model for open-systems-based high-performance distributed computing

    Microsoft Academic Search

    Wojtek Furmanski; Chris Faigle; Tomasz Haupt; Janusz Niemiec; Marek Podgorny; Diglio A. Simoni

    1993-01-01

    MOVIE(MultitaskingObject-orientedVisual Interactive Environment) is a new software system for High Perfor- mance Distributed Computing (HPDC), currently in the advanced design and implementation stage at Northeast Parallel Architectures Center (NPAC), Syracuse Univer- sity. The MOVIE System is structured as a multiserver network of interpreters of high-level object-oriented pro- gramming language MovieScript. MovieScript derives from PostScript and extends it in the C++

  1. Flow Distribution in Hydraulic Systems

    NASA Technical Reports Server (NTRS)

    Nguyen, S. N.

    1983-01-01

    General Flow Distribution Program analyzes pressure drops and flow distribution in closed and open hydraulic systems. Analyzes system on basis of incompressible flow though system may contain either compressible or incompressible fluid. Program solves fixed or variable flow problems for series, parallel, or series/parallel systems.

  2. [The future of telepathology. An Internet "distributed system" with "open standards"].

    PubMed

    Brauchli, K; Helfrich, M; Christen, H; Jundt, G; Haroske, G; Mihatsch, M; Oberli, H; Oberholzer, M

    2002-05-01

    With the availability of Internet, the interest in the possibilities of telepathology has increased considerably. In the foreground is thereby the need of the non-expert to bring in the opinions of experts on morphological findings by means of a fast and simple procedure. The new telepathology system iPath is in compliance with these needs. The system is based on small, but when possible independently working modules. This concept allows a simple adaptation of the system to the individual environment of the user (e.g. for different cameras, frame-grabbers, microscope steering tables etc.) and for individual needs. iPath has been in use for 6 months with various working groups. In telepathology a distinction is made between "passive" and "active" consultations but for both forms a non-expert brings in the opinion of an expert. In an active consultation both are in direct connection with each other (orally or via a chat-function), this is however not the case with a passive consultation. An active consultation can include the interactive discussion of the expert with the non-expert on images in an image database or the direct interpretation of images from a microscope by the expert. Four software modules are available for a free and as fast as possible application: (1) the module "Microscope control", (2) the module "Connector" (insertion of images directly from the microscope without a motorized microscope), (3) the module "Client-application" via the web-browser and (4) the module "Server" with a database. The server is placed in the internet and not behind a firewall. The server permanently receives information from the periphery and returns the information to the periphery on request. The only thing which the expert, the non-expert and the microscope have to know is how contact can made with the server. PMID:12089787

  3. Open Source CRM Systems

    Microsoft Academic Search

    Kaderják Gyula; Simon András

    The object of this study is a comprehensive review of the open source customer relationship management (CRM) systems. The open source softwares have become one of the most important trends in the software industry recently. Similarly, the CRM systems are applied more increasingly in several fields of economy. The CRM is not merely a subsequent software technology and application in

  4. The V distributed system

    Microsoft Academic Search

    David R. Cheriton

    1988-01-01

    The V distributed System was developed at Stanford University as part of a research project to explore issues in distributed systems. Aspects of the design suggest important directions for the design of future operating systems and communication systems.

  5. Modelling Distributed Systems

    E-print Network

    Yonezawa, Akinori

    1977-06-01

    Distributed systems are multi-processor information processing systems which do not rely on the central shared memory for communication. This paper presents ideas and techniques in modelling distributed systems and ...

  6. Open Rating Systems

    Microsoft Academic Search

    R. Guha

    In the offline world, we look to the people we trust and those they trust for reliable information. In this paper, we present a compu- tational model of this phenomenon and show how it can be used to identify high quality content in an Open Rating System, i.e., a system in which any user can rate content. We present a

  7. Distributed Theorem Proving for Distributed Hybrid Systems

    E-print Network

    Platzer, André

    system with a varying number of arbitrarily many cars. 1 Introduction Hybrid systems with joint discrete a multi-agent system, e.g., distributed car control systems. Such systems form distributed hybrid systemsDistributed Theorem Proving for Distributed Hybrid Systems David W. Renshaw, Sarah M. Loos

  8. Introduction to Distributed Systems

    E-print Network

    Pous, Damien

    1 Introduction to Distributed Systems Fabienne Boyer, LIG, fabienne.boyer@inria.fr Sources: Cours d'Olivier Gruber, Sacha Krakowiak, Sara Bouchenak, UJF Fabienne Boyer, Distributed Programming 2 Objectives Study conceptual and practical aspects of distributed systems l Client-server model l Distributed protocols l

  9. Open system environment procurement

    NASA Technical Reports Server (NTRS)

    Fisher, Gary

    1994-01-01

    Relationships between the request for procurement (RFP) process and open system environment (OSE) standards are described. A guide was prepared to help Federal agency personnel overcome problems in writing an adequate statement of work and developing realistic evaluation criteria when transitioning to an OSE. The guide contains appropriate decision points and transition strategies for developing applications that are affordable, scalable and interoperable across a broad range of computing environments. While useful, the guide does not eliminate the requirement that agencies posses in-depth expertise in software development, communications, and database technology in order to evaluate open systems.

  10. Open quantum systems

    E-print Network

    A. Isar; A. Sandulescu; H. Scutaru; E. Stefanescu; W. Scheid

    2004-11-26

    The damping of the harmonic oscillator is studied in the framework of the Lindblad theory for open quantum systems. A generalization of the fundamental constraints on quantum mechanical diffusion coefficients which appear in the master equation for the damped quantum oscillator is presented; the Schr\\"odinger, Heisenberg and Weyl-Wigner-Moyal representations of the Lindblad equation are given explicitly. On the basis of these representations it is shown that various master equations for the damped quantum oscillator used in the literature are particular cases of the Lindblad equation and that not all of these equations are satisfying the constraints on quantum mechanical diffusion coefficients. The master equation is transformed into Fokker-Planck equations for quasiprobability distributions and a comparative study is made for the Glauber $P$ representation, the antinormal ordering $Q$ representation and the Wigner $W$ representation. The density matrix is represented via a generating function, which is obtained by solving a time-dependent linear partial differential equation derived from the master equation. The damped harmonic oscillator is applied for the description of the charge equilibration mode observed in deep inelastic reactions. For a system consisting of two harmonic oscillators the time dependence of expectation values, Wigner function and Weyl operator are obtained and discussed. In addition models for the damping of the angular momentum are studied. Using this theory to the quantum tunneling through the nuclear barrier, besides Gamow's transitions with energy conservation, additional transitions with energy loss, are found. When this theory is used to the resonant atom-field interaction, new optical equations describing the coupling through the environment are obtained.

  11. Distributed operating systems

    Microsoft Academic Search

    Andrew S. Tanenbaum; Robbert Van Renesse

    1985-01-01

    Distributed operating systems have many aspects in common with centralized ones, but they also differ in certain ways. This paper is intended as an introduction to distributed operating systems, and especially to current university research about them. After a discussion of what constitutes a distributed operating system and how it is distinguished from a computer network, various key design issues

  12. Distributed computational electromagnetics systems

    SciTech Connect

    Cheng, G.; Hawick, K.A.; Fox, G.C. [Syracuse Univ., NY (United States)] [and othersr

    1995-12-01

    We describe our development of a {open_quotes}real world{close_quotes} electromagnetic application on distributed computing systems. A computational electromagnetics (CEM) simulation for radar cross-section(RCS) modeling of full scale airborne systems has been ported to three networked workstation cluster systems: an IBM RS/6000 cluster with Ethernet connection; a DEC Alpha farm connected by a FDDI-based Gigaswitch; and an ATM-connected SUN IPXs testbed. We used the ScaLAPACK LU solver from Oak Ridge National Laboratory/University of Tennessee in our parallel implementation for solving the dense matrix which forms the computationally intensive kernel of this application, and we have adopted BLACS as the message passing interface in all of our code development to achieve high portability across the three configurations. The performance data from this work is reported, together with timing data from other MPP systems on which we have implemented this application including an Intel iPSC/860 and a CM-5, and which we include for comparison.

  13. Quantum Mechanics + Open Systems

    E-print Network

    Steinhoff, Heinz-Jürgen

    Quantum Mechanics + Open Systems = Thermodynamics ? Jochen Gemmer T¨ubingen, 09.02.2006 #12., World Scientific) #12;Fundamental Law or Emergent Description? Quantum Mechanics i t = (- 2 2m + V or Emergent Description? Quantum Mechanics i t = (- 2 2m + V ) "Heisenberg Cut" Classical Mechanics: m d2

  14. FRIB cryogenic distribution system

    NASA Astrophysics Data System (ADS)

    Ganni, V.; Dixon, K.; Laverdure, N.; Knudsen, P.; Arenius, D.; Barrios, M.; Jones, S.; Johnson, M.; Casagrande, F.

    2014-01-01

    The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

  15. FRIB cryogenic distribution system

    SciTech Connect

    Ganni, V.; Dixon, K.; Laverdure, N.; Knudsen, P.; Arenius, D. [Thomas Jefferson National Accelerator Facility (JLab), Newport News, VA 23606 (United States); Barrios, M.; Jones, S.; Johnson, M.; Casagrande, F. [Facility for Rare Isotope Beams (FRIB), Michigan State University, East Lansing, MI 48824 (United States)

    2014-01-29

    The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

  16. Open architecture CNC system

    SciTech Connect

    Tal, J. [Galil Motion Control Inc., Sunnyvale, CA (United States); Lopez, A.; Edwards, J.M. [Los Alamos National Lab., NM (United States)

    1995-04-01

    In this paper, an alternative solution to the traditional CNC machine tool controller has been introduced. Software and hardware modules have been described and their incorporation in a CNC control system has been outlined. This type of CNC machine tool controller demonstrates that technology is accessible and can be readily implemented into an open architecture machine tool controller. Benefit to the user is greater controller flexibility, while being economically achievable. PC based, motion as well as non-motion features will provide flexibility through a Windows environment. Up-grading this type of controller system through software revisions will keep the machine tool in a competitive state with minimal effort. Software and hardware modules are mass produced permitting competitive procurement and incorporation. Open architecture CNC systems provide diagnostics thus enhancing maintainability, and machine tool up-time. A major concern of traditional CNC systems has been operator training time. Training time can be greatly minimized by making use of Windows environment features.

  17. Video Distribution Systems.

    ERIC Educational Resources Information Center

    Davoust, David

    1994-01-01

    Describes video distribution systems as a way of giving control of all monitors in a classroom to the teacher. Examples of their use are given, including distribution in language labs and distribution from a media lab to classrooms throughout a school building; and information about five vendors is included. (LRW)

  18. Naval open systems architecture

    NASA Astrophysics Data System (ADS)

    Guertin, Nick; Womble, Brian; Haskell, Virginia

    2013-05-01

    For the past 8 years, the Navy has been working on transforming the acquisition practices of the Navy and Marine Corps toward Open Systems Architectures to open up our business, gain competitive advantage, improve warfighter performance, speed innovation to the fleet and deliver superior capability to the warfighter within a shrinking budget1. Why should Industry care? They should care because we in Government want the best Industry has to offer. Industry is in the business of pushing technology to greater and greater capabilities through innovation. Examples of innovations are on full display at this conference, such as exploring the impact of difficult environmental conditions on technical performance. Industry is creating the tools which will continue to give the Navy and Marine Corps important tactical advantages over our adversaries.

  19. Distributed Systems Multiagent Systems

    E-print Network

    Polani, Daniel

    ; no \\big brother" #15; distributedness 5 #12; Why RoboCup? \\Conventional" Scienti#12;c Approach: #15 { solution of problems in a team { against adversarial conditions { planning, learning and adaptation #15; no \\Big Brother"! #15; prototype for multiagent systems 11 #12; Scenario server agent team 2 agent team 1

  20. Integrating Distributed Algorithms into Distributed Systems

    E-print Network

    Freytag, Johann-Christoph

    ; Compositionality; Temporal Logic. 1 Introduction Distributed algorithms solve abstract versions of significantIntegrating Distributed Algorithms into Distributed Systems Ekkart Kindler and Sibylle Peuker algorithms are often part of a larger distributed system. Usually, the properties of the algorithm are proven

  1. Cooling water distribution system

    DOEpatents

    Orr, Richard (Pittsburgh, PA)

    1994-01-01

    A passive containment cooling system for a nuclear reactor containment vessel. Disclosed is a cooling water distribution system for introducing cooling water by gravity uniformly over the outer surface of a steel containment vessel using an interconnected series of radial guide elements, a plurality of circumferential collector elements and collector boxes to collect and feed the cooling water into distribution channels extending along the curved surface of the steel containment vessel. The cooling water is uniformly distributed over the curved surface by a plurality of weirs in the distribution channels.

  2. Open Source Live Distributions for Computer Forensics

    NASA Astrophysics Data System (ADS)

    Giustini, Giancarlo; Andreolini, Mauro; Colajanni, Michele

    Current distributions of open source forensic software provide digital investigators with a large set of heterogeneous tools. Their use is not always focused on the target and requires high technical expertise. We present a new GNU/Linux live distribution, named CAINE (Computer Aided INvestigative Environment) that contains a collection of tools wrapped up into a user friendly environment. The CAINE forensic framework introduces novel important features, aimed at filling the interoperability gap across different forensic tools. Moreover, it provides a homogeneous graphical interface that drives digital investigators during the acquisition and analysis of electronic evidence, and it offers a semi-automatic mechanism for the creation of the final report.

  3. Control of open quantum systems

    E-print Network

    Boulant, Nicolas

    2005-01-01

    This thesis describes the development, investigation and experimental implementation via liquid state nuclear magnetic resonance techniques of new methods for controlling open quantum systems. First, methods that improve ...

  4. Distribution system simulator

    NASA Technical Reports Server (NTRS)

    Bahrami, K. A.; Kirkham, H.; Rahman, S.

    1986-01-01

    In a series of tests performed under the Department of Energy auspices, power line carrier propagation was observed to be anomalous under certain circumstances. To investigate the cause, a distribution system simulator was constructed. The simulator was a physical simulator that accurately represented the distribution system from below power frequency to above 50 kHz. Effects such as phase-to-phase coupling and skin effect were modeled. Construction details of the simulator, and experimental results from its use are presented.

  5. DIstributed VIRtual System (DIVIRS) project

    NASA Technical Reports Server (NTRS)

    Schorr, Herbert; Neuman, Clifford B.

    1995-01-01

    As outlined in our continuation proposal 92-ISI-50R (revised) on NASA cooperative agreement NCC2-539, we are (1) developing software, including a system manager and a job manager, that will manage available resources and that will enable programmers to develop and execute parallel applications in terms of a virtual configuration of processors, hiding the mapping to physical nodes; (2) developing communications routines that support the abstractions implemented in item one; (3) continuing the development of file and information systems based on the Virtual System Model; and (4) incorporating appropriate security measures to allow the mechanisms developed in items 1 through 3 to be used on an open network. The goal throughout our work is to provide a uniform model that can be applied to both parallel and distributed systems. We believe that multiprocessor systems should exist in the context of distributed systems, allowing them to be more easily shared by those that need them. Our work provides the mechanisms through which nodes on multiprocessors are allocated to jobs running within the distributed system and the mechanisms through which files needed by those jobs can be located and accessed.

  6. DIstributed VIRtual System (DIVIRS) project

    NASA Technical Reports Server (NTRS)

    Schorr, Herbert; Neuman, B. Clifford

    1994-01-01

    As outlined in our continuation proposal 92-ISI-. OR (revised) on NASA cooperative agreement NCC2-539, we are (1) developing software, including a system manager and a job manager, that will manage available resources and that will enable programmers to develop and execute parallel applications in terms of a virtual configuration of processors, hiding the mapping to physical nodes; (2) developing communications routines that support the abstractions implemented in item one; (3) continuing the development of file and information systems based on the Virtual System Model; and (4) incorporating appropriate security measures to allow the mechanisms developed in items 1 through 3 to be used on an open network. The goal throughout our work is to provide a uniform model that can be applied to both parallel and distributed systems. We believe that multiprocessor systems should exist in the context of distributed systems, allowing them to be more easily shared by those that need them. Our work provides the mechanisms through which nodes on multiprocessors are allocated to jobs running within the distributed system and the mechanisms through which files needed by those jobs can be located and accessed.

  7. Open quantum systems and random matrix theory

    SciTech Connect

    Mulhall, Declan [Department of Physics/Engineering, University of Scranton, Scranton, Pennsylvania 18510-4642 (United States)

    2014-10-15

    A simple model for open quantum systems is analyzed with RMT. The system is coupled to the continuum in a minimal way. In this paper we see the effect of opening the system on the level statistics, in particular the level spacing, width distribution and ?{sub 3}(L) statistic are examined as a function of the strength of this coupling. The usual super-radiant state is observed, and it is seen that as it is formed, the level spacing and ?{sub 3}(L) statistic exhibit the signatures of missed levels.

  8. Open-PEA Space Charge Measurement System

    NASA Astrophysics Data System (ADS)

    Imai, Satoshi; Tanaka, Yasuhiro; Fukao, Tadashi; Takada, Tatsuo; Maeno, Takashi

    The pulsed electro-acoustic (PEA) method has been widely used to observe space charge phenomena in dielectric materials. There have been awaited demands for monitoring space charge phenomena under electron beam or radioactive rays irradiations, or during plasma processing. Therefore we have developed a new PEA space charge measurement system that can observe space charge distributions under such severe conditions. This system uses an open upper electrode that can measure surface and internal space charge profiles at the same time. This paper introduces the 'Open-PEA system' with experimental results obtained during electron irradiation in vacuum.

  9. Distributed Computerized Catalog System

    NASA Technical Reports Server (NTRS)

    Borgen, Richard L.; Wagner, David A.

    1995-01-01

    DarkStar Distributed Catalog System describes arbitrary data objects in unified manner, providing end users with versatile, yet simple search mechanism for locating and identifying objects. Provides built-in generic and dynamic graphical user interfaces. Design of system avoids some of problems of standard DBMS, and system provides more flexibility than do conventional relational data bases, or object-oriented data bases. Data-collection lattice partly hierarchical representation of relationships among collections, subcollections, and data objects.

  10. Distributed Systems Technology for Electronic Commerce Applications

    Microsoft Academic Search

    Winfried Lamersdorf; Michael Merz; M. Tuan Tu

    1998-01-01

    Based on the specific characteristics of electronic commerce (E- Commerce) requirements for an adequate system support, this contribution gives an overview of the respective distributed systems technology which is (or will be shortly) available for open and heterogeneous electronic commerce ap- plications. Starting from basic communication mechanisms this includes (trans- actionally secure) remote procedure call and database access mechanisms, serv-

  11. A Safety Engineering Framework for Open Adaptive Systems

    Microsoft Academic Search

    Daniel Schneider; Mario Trapp

    2011-01-01

    In recent years it has become more and more evident that openness and adaptivity are key characteristics of next generation distributed systems. The reason for that is not least the advent of computing trends like Ubiquitous Computing, Ambient Intelligence, and Cyber Physical Systems, where systems are usually open for dynamic integration and able to react adaptively to changing situations. Despite

  12. Pade spectrum decompositions of quantum distribution functions and optimal hierarchical equations of motion construction for quantum open systems

    SciTech Connect

    Hu Jie; Luo Meng; Jiang Feng [Department of Chemistry, Hong Kong University of Science and Technology, Kowloon (Hong Kong); Xu Ruixue [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Yan Yijing [Department of Chemistry, Hong Kong University of Science and Technology, Kowloon (Hong Kong); Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)

    2011-06-28

    Pade spectrum decomposition is an optimal sum-over-poles expansion scheme of Fermi function and Bose function [J. Hu, R. X. Xu, and Y. J. Yan, J. Chem. Phys. 133, 101106 (2010)]. In this work, we report two additional members to this family, from which the best among all sum-over-poles methods could be chosen for different cases of application. Methods are developed for determining these three Pade spectrum decomposition expansions at machine precision via simple algorithms. We exemplify the applications of present development with optimal construction of hierarchical equations-of-motion formulations for nonperturbative quantum dissipation and quantum transport dynamics. Numerical demonstrations are given for two systems. One is the transient transport current to an interacting quantum-dots system, together with the involved high-order co-tunneling dynamics. Another is the non-Markovian dynamics of a spin-boson system.

  13. Seamless Data Distribution System

    NSDL National Science Digital Library

    USGS

    This site from the USGS and the EROS Data Center (EDC) presents the Seamless Data Distribution System (SDDS). The site is the ultimate location for exploration and data retrieval from both the United States and international locations. The site features free data downloads, user defined datasets and area, data acquisition from different government hosts, and elevation point and profile tools.

  14. Load Distributing for Locally Distributed Systems

    Microsoft Academic Search

    Niranjan G. Shivaratri; Phillip Krueger; Mukesh Singhal

    1992-01-01

    The problem of judiciously and transparently redistributing the load of the system among its nodes so that overall performance is maximized is discussed. Several key issues in load distributing for general-purpose systems, including the motivations and design trade-offs for load-distributing algorithms, are reviewed. In addition, several load-distributing algorithms are described and their performances are compared. These algorithms are sender-initiated algorithms,

  15. RBAC administration in distributed systems

    Microsoft Academic Search

    M. A. C. Dekker; Jason Crampton; Sandro Etalle; N. Li

    2008-01-01

    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 deflne two basic requirements for distributed RBAC systems, based on safety and availability. We present a transition-system

  16. Distributed Optimization System

    DOEpatents

    Hurtado, John E. (Albuquerque, NM); Dohrmann, Clark R. (Albuquerque, NM); Robinett, III, Rush D. (Tijeras, NM)

    2004-11-30

    A search system and method for controlling multiple agents to optimize an objective using distributed sensing and cooperative control. The search agent can be one or more physical agents, such as a robot, and can be software agents for searching cyberspace. The objective can be: chemical sources, temperature sources, radiation sources, light sources, evaders, trespassers, explosive sources, time dependent sources, time independent sources, function surfaces, maximization points, minimization points, and optimal control of a system such as a communication system, an economy, a crane, and a multi-processor computer.

  17. Planning Systems for Distributed Operations

    NASA Technical Reports Server (NTRS)

    Maxwell, Theresa G.

    2002-01-01

    This viewgraph representation presents an overview of the mission planning process involving distributed operations (such as the International Space Station (ISS)) and the computer hardware and software systems needed to support such an effort. Topics considered include: evolution of distributed planning systems, ISS distributed planning, the Payload Planning System (PPS), future developments in distributed planning systems, Request Oriented Scheduling Engine (ROSE) and Next Generation distributed planning systems.

  18. Distributed Deliberative Recommender Systems

    NASA Astrophysics Data System (ADS)

    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.

  19. Tsallis Entropy Based Velocity Distribution in Open Channel Flows 

    E-print Network

    Luo, Hao

    2010-07-14

    The Tsallis entropy is applied to derive both 1-D and 2-D velocity distributions in an open channel cross section. These distributions contain a parameter m through which the Tsallis entropy becomes a generalization of the ...

  20. The Distributed Annotation System

    Microsoft Academic Search

    Robin D. Dowell; Rodney M. Jokerst; Allen Day; Sean R. Eddy; Lincoln Stein

    2001-01-01

    BackgroundCurrently, most genome annotation is curated by centralized groups with limitedresources. Efforts to share annotations transparently among multiple groups have not yet beensatisfactory.ResultsHere we introduce a concept called the Distributed Annotation System (DAS). DASallows sequence annotations to be decentralized among multiple third-party annotators andintegrated on an as-needed basis by client-side software. The communication between clientand servers in DAS is...

  1. Distributed Runtime Verification of JADE Multiagent Systems

    E-print Network

    Mascardi, Viviana

    Distributed Runtime Verification of JADE Multiagent Systems Daniela Briola, Viviana Mascardi many real MASs are based on JADE, a well known open source plat- form for MAS development, we) formalism for representing protocols. Using our JADE monitor we were able to verify FYPA, an extremely

  2. Gaining Confidence in Distributed Systems Gleb Naumovich,

    E-print Network

    Massachusetts at Amherst, University of

    flow analysis to verify, automatically and efficiently, user­specified properties of distributed behavior but instead describe important requirements of the system, such as the elevator door can not open while the elevator is moving. Thus, instead of a test case which would exercise one path to show

  3. Onsite Wastewater Treatment Systems: Spray Distribution System

    E-print Network

    Lesikar, Bruce J.

    2008-10-23

    Disinfectant storage Pump tank Spray heads Wastewater treatment system Onsite wastewater treatment systems Spray distribution system L-5303 9-08 Figure 1: A spray distribution system with treatment and disinfection devices. S pray distribution... to install of all wastewa- ter distribution systems. However, they require the most wastewater treatment, which increases the cost of a com- plete treatment and final treatment and dispersal system. Spray systems also help conserve Texas? freshwater...

  4. Quality monitored distributed voting system

    DOEpatents

    Skogmo, D.

    1997-03-18

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system. 6 figs.

  5. Quality monitored distributed voting system

    DOEpatents

    Skogmo, David (Albuquerque, NM)

    1997-01-01

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system.

  6. Zipf law in the popularity distribution of chess openings

    Microsoft Academic Search

    B. Blasius; R. Toenjes

    2007-01-01

    We perform a quantitative analysis of extensive chess databases and show that the frequencies of opening moves are distributed according to a power-law with an exponent that increases linearly with the game depth, whereas the pooled distribution of all opening weights follows Zipf's law with universal exponent. We propose a simple stochastic process that is able to capture the observed

  7. Onsite Wastewater Treatment Systems: Spray Distribution System 

    E-print Network

    Lesikar, Bruce J.

    2008-10-23

    Spray distribution systems for wastewater are much like lawn sprinkler systems, in that they spray treated wastewater over the surface of a yard. This publication explains how spray distribution systems work, what their design requirements are...

  8. Open Systems Interconnection (OSI) Model

    NSDL National Science Digital Library

    Castro, Tony

    Created by Tony Castro of the Information and Communications Technologies Center (ICT), this simulation demonstrates network architecture and all its layers based on the Open Systems Interconnection (OSI) model. This resource is a helpful addition to any course on information and communications technologies as it allows students to see exactly how the model works in information systems.

  9. OpenSees: Open System for Earthquake Engineering Simulation

    NSDL National Science Digital Library

    The Open System for Earthquake Engineering Simulation (OpenSees) is a project of the Pacific Earthquake Engineering Research Center. OpenSees is an open source "software framework for developing applications to simulate the performance of structural and geotechnical systems subjected to earthquakes." The project's homepage maintains resources for users and developers, including downloadable source code, extensive documentation, and instructions on how to contribute code. Several links to other research projects that are using the OpenSees tool are provided. Additionally, an OpenSees user's workshop was held in August 2003, and the presentations from the event are available.

  10. Entropy and Specific Heat for Open Systems in Steady States

    Microsoft Academic Search

    X. L. Huang; B. Cui; X. X. Yi

    2011-01-01

    The fundamental assumption of statistical mechanics is that the system is equally likely in any of the accessible microstates. Based on this assumption, the Boltzmann distribution is derived and the full theory of statistical thermodynamics can be built. In this paper, we show that the Boltzmann distribution in general cannot describe the steady state of an open system. Based on

  11. An Open Source Simulation System

    NASA Technical Reports Server (NTRS)

    Slack, Thomas

    2005-01-01

    An investigation into the current state of the art of open source real time programming practices. This document includes what technologies are available, how easy is it to obtain, configure, and use them, and some performance measures done on the different systems. A matrix of vendors and their products is included as part of this investigation, but this is not an exhaustive list, and represents only a snapshot of time in a field that is changing rapidly. Specifically, there are three approaches investigated: 1. Completely open source on generic hardware, downloaded from the net. 2. Open source packaged by a vender and provided as free evaluation copy. 3. Proprietary hardware with pre-loaded proprietary source available software provided by the vender as for our evaluation.

  12. DISTRIBUTION SYSTEM CONSIDERATIONS FOR TREATMENT

    EPA Science Inventory

    EPA and other research has shown that drinking water distribution systems are active reactors, which can accumulate, release, or transform contaminants during passage from the treatment plant to the consumers’ taps. This presentation discusses the nature of distribution sys...

  13. Increasing distributed generation penetration using soft normally-open points

    Microsoft Academic Search

    Jeffrey M. Bloemink; Timothy C. Green

    2010-01-01

    This paper considers the effects of various voltage control solutions on facilitating an increase in allowable levels of distributed generation installation before voltage violations occur. In particular, the voltage control solution that is focused on is the implementation of `soft' normally-open points (SNOPs), a term which refers to power electronic devices installed in place of a normally-open point in a

  14. Open-Source Software Development and Distributed Innovation

    Microsoft Academic Search

    Bruce Kogut; Anca Metiu

    2001-01-01

    Open-source software development is a production model that exploits the distributed intelligence of participants in Internet communities. This model is efficient because of two related reasons: it avoids the inefficiencies of a strong intellectual property regime and it implements concurrently design and testing of software modules. The hazard of open source is that projects can 'fork' into competing versions. However,

  15. Open systems for plant process computers

    SciTech Connect

    Norris, D.L. [Halliburton NUS, Idaho Falls, ID (United States); Pate, R.L. [Arizona Public Service Co., Phoenix, AZ (United States)

    1995-03-01

    Arizona Public Service (APS) Company recently upgraded the Emergency Response Facility (ERF) computer at the Palo Verde Nuclear Generating Stations (PVNGS). The project was initiated to provide the ability to record and display plant data for later analysis of plant events and operational problems (one of the great oversights at nearly every nuclear plant constructed) and to resolve a commitment to correct performance problems on the display side of the system. A major forming objective for the project was to lay a foundation with ample capability and flexibility to provide solutions for future real-time data needs at the plants. The Halliburton NUS Corporation`s Idaho Center (NUS) was selected to develop the system. Because of the constant changes occurring in the computer hardware and software industry, NUS designed and implemented a distributed Open Systems solution based on the UNIX Operating System. This Open System is highly portable across a variety of computer architectures and operating systems and is based on NUS` R*TIME{reg_sign}, a mature software system successfully operating in 14 nuclear plants and over 80 fossil plants. Along with R*TIME, NUS developed two Man-Machine Interface (MMI) versions: R*TIME/WIN, a Microsoft Windows application designed for INTEL-based personal computers operating either Microsoft`s Windows 3.1 or Windows NT operating systems; and R*TIME/X, based on the standard X Window System utilizing the Motif Window Manager.

  16. Wireless distributed data acquisition system

    Microsoft Academic Search

    Brent Priddy; Emil Jovanov

    2002-01-01

    Distributed data acquisition requires a flexible system organization, particularly when individual devices are mobile. The utility companies have been developing similar systems for several years now. In the case of medical devices, a mobile patient monitoring device would allow patients to leave the hospital and engage in normal activity, uploading physiological data only periodically. The wireless distributed data acquisition system

  17. Constructing Distributed Systems in Conic

    Microsoft Academic Search

    Jeff Magee; Jeff Kramer; Morris Sloman

    1989-01-01

    Existing distributed systems vary from those which merely provide interconnection of autonomous systems to those which provide a complete language environment for writing distributed programs. The former tend to support flexibility and provide ready access to system facilities, but suffer by being complex to use. Language environments are simpler to use and can provide safer environments by performing checks, but

  18. Load Balancing in Distributed Systems

    Microsoft Academic Search

    Timothy C. K. Chou; Jacob A. Abraham

    1982-01-01

    In a distributed computing system made up of different types of processors each processor in the system may have different performance and reliability characteristics. In order to take advantage of this diversity of processing power, a modular distributed program should have its modules assigned in such a way that the applicable system performance index, such as execution time or cost,

  19. Generic Interfaces to Remote Applications in Open Systems M. Merz and W. Lamersdorf

    E-print Network

    Generic Interfaces to Remote Applications in Open Systems M. Merz and W. Lamersdorf Department will profit substantially from emerging open distributed computer communication network environments cooperations are frequently hindered by the great and confusing variety of interfaces involved in accessing

  20. OpenRIMS: An Open Architecture Radiology Informatics Management System

    Microsoft Academic Search

    Steve G. Langer

    2002-01-01

    The following are benefits of an integrated picture archiving and communication system\\/radiology information system archive built with open-source tools and methods: open source, inexpensive interfaces can be updated as needed, and reduced risk of redundant and inconsistent data. Also, wide adoption would promote standard data mining tools, reducing user needs to learn multiple methods to perform the same task. A

  1. Standard Data Exchanges for Distribution System Management

    SciTech Connect

    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.

  2. 14 CFR 25.1355 - Distribution system.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Distribution system. 25.1355 Section 25.1355 Aeronautics...Electrical Systems and Equipment § 25.1355 Distribution system. (a) The distribution system includes the distribution busses,...

  3. 14 CFR 29.1355 - Distribution system.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Distribution system. 29.1355 Section 29.1355 Aeronautics...Electrical Systems and Equipment § 29.1355 Distribution system. (a) The distribution system includes the distribution busses,...

  4. Distributed systems status and control

    NASA Technical Reports Server (NTRS)

    Kreidler, David; Vickers, David

    1990-01-01

    Concepts are investigated for an automated status and control system for a distributed processing environment. System characteristics, data requirements for health assessment, data acquisition methods, system diagnosis methods and control methods were investigated in an attempt to determine the high-level requirements for a system which can be used to assess the health of a distributed processing system and implement control procedures to maintain an accepted level of health for the system. A potential concept for automated status and control includes the use of expert system techniques to assess the health of the system, detect and diagnose faults, and initiate or recommend actions to correct the faults. Therefore, this research included the investigation of methods by which expert systems were developed for real-time environments and distributed systems. The focus is on the features required by real-time expert systems and the tools available to develop real-time expert systems.

  5. Engineering Reconfigurable Distributed Software Systems

    E-print Network

    Boyer, Edmond

    Engineering Reconfigurable Distributed Software Systems: Issues Arising for Pervasive Computing in general and in perva- sive systems in particular, by introducing a generic reconfiguration cycle environments. We, then, outline our approach towards uncontrolled reconfiguration targeting environments

  6. Quantum Entanglement in Open Systems

    SciTech Connect

    Isar, Aurelian [Institute of Physics and Nuclear Engineering, Bucharest-Magurele (Romania)

    2008-01-24

    In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, the master equation for two independent harmonic oscillators interacting with an environment is solved in the asymptotic long-time regime. Using the Peres-Simon necessary and sufficient condition for separability of two-mode Gaussian states, we show that the two non-interacting systems become asymptotically entangled for certain environments, so that in the long-time regime they manifest non-local quantum correlations. We calculate also the logarithmic negativity characterizing the degree of entanglement of the asymptotic state.

  7. Entropy and specific heat for open systems in steady states

    E-print Network

    X. L. Huang; B. Cui; X. X. Yi

    2010-01-27

    The fundamental assumption of statistical mechanics is that the system is equally likely in any of the accessible microstates. Based on this assumption, the Boltzmann distribution is derived and the full theory of statistical thermodynamics can be built. In this paper, we show that the Boltzmann distribution in general can not describe the steady state of open system. Based on the effective Hamiltonian approach, we calculate the specific heat, the free energy and the entropy for an open system in steady states. Examples are illustrated and discussed.

  8. Automated Power-Distribution System

    NASA Technical Reports Server (NTRS)

    Thomason, Cindy; Anderson, Paul M.; Martin, James A.

    1990-01-01

    Automated power-distribution system monitors and controls electrical power to modules in network. Handles both 208-V, 20-kHz single-phase alternating current and 120- to 150-V direct current. Power distributed to load modules from power-distribution control units (PDCU's) via subsystem distributors. Ring busses carry power to PDCU's from power source. Needs minimal attention. Detects faults and also protects against them. Potential applications include autonomous land vehicles and automated industrial process systems.

  9. The LOCUS distributed operating system

    Microsoft Academic Search

    Bruce Walker; Gerald Popek; Robert English; Charles Kline; Greg Thiel

    1983-01-01

    LOCUS is a distributed operating system which supports transparent access to data through a network wide filesystem, permits automatic replication of storage, supports transparent distributed process execution, supplies a number of high reliability functions such as nested transactions, and is upward compatible with Unix. Partitioned operation of subnet's and their dynamic merge is also supported. The system has been operational

  10. Optimistic recovery in distributed systems

    Microsoft Academic Search

    Robert E. Strom; Shaula Yemini

    1985-01-01

    Optimistic Recovery is a new technique supporting application-independent transparent recovery from processor failures in distributed systems. In optimistic recovery communication, computation and checkpointing proceed asynchronously. Synchronization is replaced by causal dependency tracking, which enables a posteriori reconstruction of a consistent distributed system state following a failure using process rollback and message replay.Because there is no synchronization among computation, communication, and

  11. Water Treatment Technology - Distribution Systems.

    ERIC Educational Resources Information Center

    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…

  12. The LOCUS Distributed Operating System

    Microsoft Academic Search

    Bruce J. Walker; Gerald J. Popek; Robert English; Charles S. Kline; Greg Thiel

    1983-01-01

    LOCUS Is a distributed operating system which supports transparent access to data through a network wide fllesystem, permits automatic replication of storaget supports transparent distributed process execution, supplies a number of high reliability functions such as nested transactions, and is upward compatible with Unix. Partitioned operation of subnetl and their dynamic merge is also supported. The system has been operational

  13. The flag taxonomy of open hypermedia systems

    Microsoft Academic Search

    Kasper Østerbye; Uffe Kock Wiil

    1996-01-01

    This paper presents a taxonomy for open hypermedia systems. The purpose of the Flagl taxonomy is manifold: (1) to provide a framework to classify and concisely describe individual systems, (2) to characterize what an open hypermedia system is, (3) to provide a framework for comparing different systems in a system independent way, and (4) to provide an overview of the

  14. Exploiting replication in distributed systems

    NASA Technical Reports Server (NTRS)

    Birman, Kenneth P.; Joseph, T. A.

    1989-01-01

    Techniques are examined for replicating data and execution in directly distributed systems: systems in which multiple processes interact directly with one another while continuously respecting constraints on their joint behavior. Directly distributed systems are often required to solve difficult problems, ranging from management of replicated data to dynamic reconfiguration in response to failures. It is shown that these problems reduce to more primitive, order-based consistency problems, which can be solved using primitives such as the reliable broadcast protocols. Moreover, given a system that implements reliable broadcast primitives, a flexible set of high-level tools can be provided for building a wide variety of directly distributed application programs.

  15. DISTRIBUTER The Distributed System for Efficient Execution of Parallel Programs

    E-print Network

    Matijevic, Domagoj

    DISTRIBUTER ­ The Distributed System for Efficient Execution of Parallel Programs Domagoj Matijevi.martinovic@etfos.hr Abstract ­ We developed the distributed system called "Distributer" in order to make use of millions A typical distributed system consists of multiple autonomous computers that communicate through a computer

  16. Air distribution effectiveness with stratified air distribution systems

    E-print Network

    Chen, Qingyan "Yan"

    1 Air distribution effectiveness with stratified air distribution systems Kisup Lee* Zheng Jiang systems such as Traditional Displacement Ventilation (TDV) and Under- Floor Air Distribution (UFAD distribution systems are better for spaces with a high ceiling. The air distribution effectiveness for the TDV

  17. Quasiequilibria in open quantum systems

    NASA Astrophysics Data System (ADS)

    Walls, Jamie D.

    2010-03-01

    In this work, the steady-state or quasiequilibrium resulting from periodically modulating the Liouvillian of an open quantum system, ???(t), is investigated. It is shown that differences between the quasiequilibrium and the instantaneous equilibrium occur due to nonadiabatic contributions from the gauge field connecting the instantaneous eigenstates of ???(t) to a fixed basis. These nonadiabatic contributions are shown to result in an additional rotation and/or depolarization for a single spin-1/2 in a time-dependent magnetic field and to affect the thermal mixing of two coupled spins interacting with a time-dependent magnetic field.

  18. Quasiequilibria in open quantum systems

    SciTech Connect

    Walls, Jamie D. [Department of Chemistry, University of Miami, Coral Gables, Florida 33124 (United States)

    2010-03-15

    In this work, the steady-state or quasiequilibrium resulting from periodically modulating the Liouvillian of an open quantum system, L-circumflex-circumflex(t), is investigated. It is shown that differences between the quasiequilibrium and the instantaneous equilibrium occur due to nonadiabatic contributions from the gauge field connecting the instantaneous eigenstates of L-circumflex-circumflex(t) to a fixed basis. These nonadiabatic contributions are shown to result in an additional rotation and/or depolarization for a single spin-1/2 in a time-dependent magnetic field and to affect the thermal mixing of two coupled spins interacting with a time-dependent magnetic field.

  19. Toward Distributed Declarative Control of Networked Cyber-Physical Systems

    Microsoft Academic Search

    Mark-Oliver Stehr; Minyoung Kim; Carolyn L. Talcott

    2010-01-01

    \\u000a Networked Cyber-Physical Systems (NCPS) present many challenges that are not suitably addressed by existing distributed computing\\u000a paradigms. They must be reactive and maintain an overall situation awareness that emerges from partial distributed knowledge.\\u000a They must achieve system goals through local, asynchronous actions, using (distributed) control loops through which the environment\\u000a provides essential feedback. Typical NCPS are open, dynamic, and heterogeneous

  20. Distribution in a Single Address Space Operating System

    E-print Network

    Anderson, Richard

    Distribution in a Single Address Space Operating System Jeff Chase, Val'erie Issarny, and Hank Levy The recent appearance of architectures with flat 64­bit virtual addressing opens an opportunity to reconsider the way our operating systems use virtual address spaces. We are building an operating system called Opal

  1. Adiabatic approximation in open quantum systems

    E-print Network

    M. S. Sarandy; D. A. Lidar

    2005-02-01

    We generalize the standard quantum adiabatic approximation to the case of open quantum systems. We define the adiabatic limit of an open quantum system as the regime in which its dynamical superoperator can be decomposed in terms of independently evolving Jordan blocks. We then establish validity and invalidity conditions for this approximation and discuss their applicability to superoperators changing slowly in time. As an example, the adiabatic evolution of a two-level open system is analysed.

  2. DISTRIBUTION SYSTEM ISSUES

    EPA Science Inventory

    The recently promulgated Arsenic Rule will require that many new drinking water systems treat their water to remove arsenic. Iron based treatment technologies including iron removal and iron coagulation are effective at reducing arsenic in water because iron surfaces have a stron...

  3. DC Power Distribution Systems 

    E-print Network

    Savage, P.

    2012-01-01

    Low capital cost and ample low-cost natural gas supplies will make natural gas-fired combustion turbine systems the power generation technology of choice over the next decade. Against the background of earlier use by electric utilities, this paper...

  4. SHORT REPORT Open Access Distribution of Aedes albopictus (Diptera,

    E-print Network

    Paris-Sud XI, Université de

    SHORT REPORT Open Access Distribution of Aedes albopictus (Diptera, Culicidae) in southwestern" Aedes (Stegomyia) albopictus (Skuse, 1895) is nowadays the most notorious invasive Culicidae. From its and dengue transmissions in Southern France in 2010 [8]. Aedes albopictus is suspected to play a prominent

  5. RESEARCH Open Access Intratumoral distribution of EGFR mutations and

    E-print Network

    Paris-Sud XI, Université de

    RESEARCH Open Access Intratumoral distribution of EGFR mutations and copy number in metastatic lung-small-cell lung cancer that benefit from first line EGFR tyrosine kinase inhibitors (EGFR-TKI). However often depends upon a single tumor-biopsy sample. The purpose of this study is to clarify and to validate

  6. RESEARCH ARTICLE Open Access Complex phylogenetic distribution of a non-

    E-print Network

    RESEARCH ARTICLE Open Access Complex phylogenetic distribution of a non- canonical genetic code eukaryotic lineages, including the ulvophycean green algal orders Dasycladales and Cladophorales. To study of a representative set of ulvophycean green algae and used a robust green algal phylogeny to evaluate different

  7. Automated Power-Distribution System

    NASA Technical Reports Server (NTRS)

    Ashworth, Barry; Riedesel, Joel; Myers, Chris; Miller, William; Jones, Ellen F.; Freeman, Kenneth; Walsh, Richard; Walls, Bryan K.; Weeks, David J.; Bechtel, Robert T.

    1992-01-01

    Autonomous power-distribution system includes power-control equipment and automation equipment. System automatically schedules connection of power to loads and reconfigures itself when it detects fault. Potential terrestrial applications include optimization of consumption of power in homes, power supplies for autonomous land vehicles and vessels, and power supplies for automated industrial processes.

  8. Fundamentals of distributed processing systems

    SciTech Connect

    Provins, G.

    1984-01-01

    The major concepts, goals and techniques of distributed processing when implemented in real-time plant information and control systems are presented. Approaches to meeting the communication requirements and system security aspects are discussed with special emphasis being given to hardware modularity and functional partitioning.

  9. Perturbative approach to Markovian open quantum systems.

    PubMed

    Li, Andy C Y; Petruccione, F; Koch, Jens

    2014-01-01

    The exact treatment of Markovian open quantum systems, when based on numerical diagonalization of the Liouville super-operator or averaging over quantum trajectories, is severely limited by Hilbert space size. Perturbation theory, standard in the investigation of closed quantum systems, has remained much less developed for open quantum systems where a direct application to the Lindblad master equation is desirable. We present such a perturbative treatment which will be useful for an analytical understanding of open quantum systems and for numerical calculation of system observables which would otherwise be impractical. PMID:24811607

  10. Evaluating Adaptive Resource Management for Distributed Real-Time Embedded Systems

    E-print Network

    Koutsoukos, Xenofon D.

    Evaluating Adaptive Resource Management for Distributed Real-Time Embedded Systems Nishanth and resource availability. Keywords Distributed Systems, Real-time and Embedded Systems, Qual- ity of Service important for open distributed real-time and embedded (DRE) systems that face resource constraints

  11. Java-based Open Platform for distributed health telematics applications.

    PubMed

    Hoepner, Petra; Eckert, Klaus-Peter

    2003-01-01

    Within the European HARP project, a Java-based Open Platform has been specified and implemented to support trustworthy distributed applications for health. Emphasis was put on security services for enabling both communication and application security. The Open Platform is Web-based and comprises the Client environment, Web/Application server, as well as Database and Archive servers. Servlets composed and executed according to the user's authorisation create signed XML messages. From those messages, user-role-related applets are generated. The technical details of the realisation are presented. Possible future enhancements for user-centric, adaptable services based on next-generation mobile service environments are outlined. PMID:15061527

  12. Probability Distributions in Complex Systems

    E-print Network

    D. Sornette

    2007-07-15

    We review briefly the concepts underlying complex systems and probability distributions. The later are often taken as the first quantitative characteristics of complex systems, allowing one to detect the possible occurrence of regularities providing a step toward defining a classification of the different levels of organization (the ``universality classes''). A rapid survey covers the Gaussian law, the power law and the stretched exponential distributions. The fascination for power laws is then explained, starting from the statistical physics approach to critical phenomena, out-of-equilibrium phase transitions, self-organized criticality, and ending with a large but not exhaustive list of mechanisms leading to power law distributions. A check-list for testing and qualifying a power law distribution from your data is described in 7 steps. This essay enlarges the description of distributions by proposing that ``kings'', i.e., events even beyond the extrapolation of the power law tail, may reveal an information which is complementary and perhaps sometimes even more important than the power law distribution. We conclude a list of future directions.

  13. An Open Architecture for Distributed Malware Collection and Analysis

    NASA Astrophysics Data System (ADS)

    Cavalca, Davide; Goldoni, Emanuele

    Honeynets have become an important tool for researchers and network operators. However, the lack of a unified honeynet data model has impeded their effectiveness, resulting in multiple unrelated data sources, each with its own proprietary access method and format. Moreover, the deployment and management of a honeynet is a time-consuming activity and the interpretation of collected data is far from trivial. HIVE (Honeynet Infrastructure in Virtualized Environment) is a novel highly scalable automated data collection and analysis architecture we designed. Our infrastructure is based on top of proven FLOSS (Free, Libre and Open Source) solutions, which have been extended and integrated with new tools we developed. We use virtualization to ease honeypot management and deployment, combining both high-interaction and low-interaction sensors in a common infrastructure. We also address the need for rapid comprehension and detailed data analysis by harnessing the power of a relational database system, which provides centralized storage and access to the collected data while ensuring its constant integrity. This chapter presents our malware data collection architecture, offering some insight in the structure and benefits of a distributed virtualized honeynet and its development. Finally, we present some techniques for the active monitoring of centralized botnets we integrated in HIVE, which allow us to track the menaces evolution and timely deploy effective countermeasures.

  14. Distributed Open Inventor is an extension to the popular Open Inventor toolkit for interactive 3D graphics. The

    E-print Network

    ABSTRACT Distributed Open Inventor is an extension to the popular Open Inventor toolkit for interactive 3D graphics. The toolkit is extended with the concept of a distributed shared scene graph, similar to distributed shared memory. From the application programmer's perspective, multiple workstations share a common

  15. Dissipation and entropy production in open quantum systems

    NASA Astrophysics Data System (ADS)

    Majima, H.; Suzuki, A.

    2010-11-01

    A microscopic description of an open system is generally expressed by the Hamiltonian of the form: Htot = Hsys + Henviron + Hsys-environ. We developed a microscopic theory of entropy and derived a general formula, so-called "entropy-Hamiltonian relation" (EHR), that connects the entropy of the system to the interaction Hamiltonian represented by Hsys-environ for a nonequilibrium open quantum system. To derive the EHR formula, we mapped the open quantum system to the representation space of the Liouville-space formulation or thermo field dynamics (TFD), and thus worked on the representation space Script L := Script H otimes , where Script H denotes the ordinary Hilbert space while the tilde Hilbert space conjugates to Script H. We show that the natural transformation (mapping) of nonequilibrium open quantum systems is accomplished within the theoretical structure of TFD. By using the obtained EHR formula, we also derived the equation of motion for the distribution function of the system. We demonstrated that by knowing the microscopic description of the interaction, namely, the specific form of Hsys-environ on the representation space Script L, the EHR formulas enable us to evaluate the entropy of the system and to gain some information about entropy for nonequilibrium open quantum systems.

  16. Distributed Supervisory Protection Interlock System

    SciTech Connect

    Walz, H.V.; Agostini, R.C.; Barker, L.; Cherkassky, R.; Constant, T.; Matheson, R.

    1989-03-01

    The Distributed Supervisory Protection Interlock System, DSPI, is under development at the Stanford Linear Accelerator Center for requirements in the areas of personnel protection, beam containment and equipment protection interlocks. The DSPI system, distributed over the application site, consists of segments with microprocessor-based controller and I/O modules, local area networks for communication, and a global supervisor computer. Segments are implemented with commercially available controller and I/O modules arranged in local interlock clusters, and associated software. Segments provide local interlock data acquisition, processing and control. Local area networks provide the communication backbone between segments and a global supervisor processor. The supervisor processor monitors the overall system, reports detail status and provides human interfaces. Details of an R and D test system, which will implement the requirements for personnel protection of 4 typical linear accelerator sectors, will be described. 4 refs., 2 figs.

  17. CLS: A Fully Open Source Control System

    Microsoft Academic Search

    E. Matias; R. Berg; T. Johnson; R. Tanner; T. Wilson; G. Wright; H. Zhang

    2005-01-01

    The Canadian Light Source (CLS) is one of the first major accelerator facilities to adopt a fully open source control system. The control system is based on Experimental Physics and Industrial Control System (EPICS) in use at may other facilities. From the outset CLS utilised Real Time Embedded Multiprocessor System (RTEMS) and Linux as the underlying operating systems for real-time

  18. Zipf law in the popularity distribution of chess openings

    E-print Network

    Blasius, B

    2007-01-01

    Human fascination with the game of chess is long-standing and pervasive. However, despite a large body of theoretical investigations, a quantitative understanding of playing behavior remains elusive. Here we demonstrate, based on an analysis of extensive chess databases, that there are simple statistical laws underlying the choice of opening moves in games of chess grandmasters and amateur players. We find that the frequencies of chess openings are distributed according to a power-law with an exponent that increases linearly with the game depth. Thus, in their initial phase the majority of chess games are concentrated among a small number of fashionable openings, whereas with increasing game depth rarely used move sequences are dominating. We present a simple stochastic process that is able to capture the observed playing statistics, providing a universal mechanism for the generation of Zipf's law. Our findings are of relevance in general composite decision processes and long tail economics.

  19. WATER QUALITY MODELING DISTRIBUTION SYSTEMS

    EPA Science Inventory

    This paper reviews the use of models for predicting water quality in distribution systems. esults of an extensive field study conducted by the USEPA and North Penn Mater Authority are examined. A case study of the model application to a waterborne disease outbreak in Cabool, Miss...

  20. Distributed wireless face recognition system

    Microsoft Academic Search

    Yanjun Yan; Lisa Ann Osadciw

    2008-01-01

    A face recognition system gains flexibility and cost efficiency while being integrated into a wireless network. Meanwhile, face recognition enhances the functionality and security of the wireless network. This paper proposes a distributed wireless network prototype, consisting of feature net and database net, to accomplish face identification task by optimally allocating network resources. The face recognition technique used in this

  1. Broadcast Protocols for Distributed Systems

    Microsoft Academic Search

    P. M. Melliar-smith; Louise E. Moser; Vivek Agrawala

    1990-01-01

    An innovative approach is presented to the design of fault-tolerant distributed systems that avoids the several rounds of message exchange required by current protocols for consensus agreement. The approach is based on broadcast communication over a local area network, such as an Ethernet or a token ring, and on two novel protocols, the Transprotocol, which provides efficient reliable broadcast communication,

  2. Application of the Open Software Foundation (OSF)distributed computing environment to global PACS

    NASA Astrophysics Data System (ADS)

    Martinez, Ralph; Alsafadi, Yasser H.; Kim, Jinman

    1994-05-01

    In this paper, we present our approach to developing Global Picture Archiving and Communication System (GPACS) applications using the Open Software Foundation (OSF) Distributed Computing Environment (DCE) services and toolkits. The OSF DCE services include remote procedure calls, naming service, threads service, time service, file management services, and security service. Several OSF DCE toolkits are currently available from computer and software vendors. Designing distributed Global PACS applications using the OSF DCE approach will feature an open architecture, heterogeneity, and technology independence for GPACS remote consultation and diagnosis applications, including synchronized image annotation, and system privacy and security. The applications can communicate through various transport services and communications networks in a Global PACS environment. The use of OSF DCE services for Global PACS will enable us to develop a robust distributed structure and new user services which feature reliability and scalability for Global PACS environments.

  3. An expert system operational aid for restoration and loss reduction of distribution systems

    Microsoft Academic Search

    C.-C. Liu; S. J. Lee; S. S. Venkata

    1988-01-01

    An application of expert system techniques to the restoration of distribution systems is reported. Primary feeders are typically radial in structure. To increase system reliability, neighboring feeders are connected through a normally open tie switch. When load zones on a feeder interrupted due to a fault, system operators need to identify neighboring feeders and try to restore customers through the

  4. Probability Distribution for $?$ in Open-universe Inflation

    E-print Network

    Alexander Vilenkin; Serge Winitzki

    1996-05-30

    The problem of making predictions in eternally inflating universe that thermalizes by bubble nucleation is considered. A recently introduced regularization procedure is applied to find the probability distribution for the ensemble of thermalized bubbles. The resulting probabilities are shown to be independent of the choice of the time parametrization. This formalism is applied to models of open ``hybrid'' inflation with $\\Omega probability distribution for $\\Omega $ is found to have a peak either very close to $\\Omega =1$, or at an intermediate value of $\\Omega $ in the range $0.03\\lesssim \\Omega <1$.

  5. Engineering Democracy in Open Agent Systems

    Microsoft Academic Search

    Peter Mcburney; Simon Parsons

    2003-01-01

    How should open agent societies be organized? Should they be democ- racies, and, if so, what types of democracy? We present three normative models of democracy from political philosophy and consider their relevance for the engi- neering of open multi-agent systems: democracy as wise rule by an elite; democ- racy as the exercise of rational consumer choices by voters; and

  6. Entropy and specific heat for open systems in steady states

    Microsoft Academic Search

    X. L. Huang; B. Cui; X. X. Yi

    2010-01-01

    The fundamental assumption of statistical mechanics is that the system is\\u000aequally likely in any of the accessible microstates. Based on this assumption,\\u000athe Boltzmann distribution is derived and the full theory of statistical\\u000athermodynamics can be built. In this paper, we show that the Boltzmann\\u000adistribution in general can not describe the steady state of open system. Based\\u000aon

  7. The effect of Distributed Generation on distribution system reliability

    Microsoft Academic Search

    Yue Yuan; Kejun Qian; Chengke Zhou

    2007-01-01

    Concerns on environmental and economical issues drive the increasing developments that support small scale generators to be connected close to distribution networks, i.e. distributed generation (DG). However, the connection of DG would affect the distribution system structure and operation greatly. Since these DG sources are normally placed close to consumption centers and are added mostly at the distribution level, the

  8. Optimal Sizing of Distributed Generation Placed on Radial Distribution Systems

    Microsoft Academic Search

    T. N. Shukla; S. P. Singh; V. Srinivasarao; K. B. Naik

    2010-01-01

    Distribution network planning identifies the least cost network investment that satisfies load growth requirements without violating any system and operational constraints. Power injections from distributed generation change network power flows, modifying energy losses. Determining appropriate location and optimal size of distributed generation with respect to network configuration and load distribution in the feeder is main challenge in the changing regulatory

  9. CEBAF Distributed Data Acquisition System

    SciTech Connect

    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.

  10. CSE 513: Distributed Systems Instructor: Guohong Cao

    E-print Network

    Cao, Guohong

    CSE 513: Distributed Systems Instructor: Guohong Cao OÆce, Phone, Email: 310 pond lab, 863 Systems, M. Singhal and N. Shivaratri References: Distributed Systems Concepts and Design, G. Coulouris, J. Course Outline: 1. Architectures of Distributed Systems { System models, networking and inter

  11. Intrusion Tolerance in Distributed Computing Systems

    Microsoft Academic Search

    Yves Deswarte; Laurent Blain; Jean-charles Fabre

    1991-01-01

    An intrusion-tolerant distributed system is a system which is designed so that any intrusion into a part of the system will not endanger confidentiality, integrity and availability. This approach is suitable for distributed systems, because distribution enables isolation of elements so that an intrusion gives physical access to only a part of the system. By intrusion, we mean not only

  12. Towards Automated Deployment of Distributed Adaptation Systems

    E-print Network

    Paris-Sud XI, Université de

    Towards Automated Deployment of Distributed Adaptation Systems Mohamed Zouari1,2 and Ismael for distributed systems due to the distribution is- sues. We address in this paper such issues by proposing a method for the software engineering of distributed adaptation systems. We propose an architectural model

  13. Middleware-based distributed systems software process

    Microsoft Academic Search

    Liu Jingyong; Zhong Yong; Chen Yong; Zhang Lichen

    2009-01-01

    Middleware facilitates the development of distributed systems by accommodating heterogeneity, hiding distribution details and providing a set of common and domain specific services. It plays a central and essential role for developing distributed systems. However, middleware is considered a mean rather than core elements of development process in the existing distributed systems software process. This paper explains the concept of

  14. Television Distribution System for Primary Schools.

    ERIC Educational Resources Information Center

    South Australia Education Dept., Adelaide.

    This report covers a 12-month study and actual trial of a video distribution system for a primary school. It consisted of a main aerial distribution into a distribution junction box which also took video cassette recorders. The whole system was designed to distribute both in RF and video frequencies. Some ways of using the system have also been…

  15. Development of an Integrated Distribution Management System

    Microsoft Academic Search

    Schatz; Joe E

    2010-01-01

    This final report details the components, functionality, costs, schedule and benefits of developing an Integrated Distribution Management System (IDMS) for power distribution system operation. The Distribution Automation (DA) and Supervisory Control and Data Acquisition (SCADA) systems used by electric power companies to manage the distribution of electric power to retail energy consumers are vital components of the Nations critical infrastructure.

  16. R-OSGi-based architecture of distributed smart home system

    Microsoft Academic Search

    Jiankun Wu; Linpeng Huang; Dejun Wang; Fei Shen

    2008-01-01

    The conventional architecture of smart home is usually server-centric and this may cause many problems. The distributed architecture presented in this paper is based on multiple OSGi (Open Service Gateway Initiative) platforms. Relative home appliance services which are compliant with R-OSGi middleware for the home network system are also developed. The important aspect of R-OSGi is that it offers distribution

  17. Quantum Simulation for Open-System Dynamics

    NASA Astrophysics Data System (ADS)

    Wang, Dong-Sheng; de Oliveira, Marcos Cesar; Berry, Dominic; Sanders, Barry

    2013-03-01

    Simulations are essential for predicting and explaining properties of physical and mathematical systems yet so far have been restricted to classical and closed quantum systems. Although forays have been made into open-system quantum simulation, the strict algorithmic aspect has not been explored yet is necessary to account fully for resource consumption to deliver bounded-error answers to computational questions. An open-system quantum simulator would encompass classical and closed-system simulation and also solve outstanding problems concerning, e.g. dynamical phase transitions in non-equilibrium systems, establishing long-range order via dissipation, verifying the simulatability of open-system dynamics on a quantum Turing machine. We construct an efficient autonomous algorithm for designing an efficient quantum circuit to simulate many-body open-system dynamics described by a local Hamiltonian plus decoherence due to separate baths for each particle. The execution time and number of gates for the quantum simulator both scale polynomially with the system size. Simulations are essential for predicting and explaining properties of physical and mathematical systems yet so far have been restricted to classical and closed quantum systems. Although forays have been made into open-system quantum simulation, the strict algorithmic aspect has not been explored yet is necessary to account fully for resource consumption to deliver bounded-error answers to computational questions. An open-system quantum simulator would encompass classical and closed-system simulation and also solve outstanding problems concerning, e.g. dynamical phase transitions in non-equilibrium systems, establishing long-range order via dissipation, verifying the simulatability of open-system dynamics on a quantum Turing machine. We construct an efficient autonomous algorithm for designing an efficient quantum circuit to simulate many-body open-system dynamics described by a local Hamiltonian plus decoherence due to separate baths for each particle. The execution time and number of gates for the quantum simulator both scale polynomially with the system size. DSW funded by USARO. MCO funded by AITF and Brazilian agencies CNPq and FAPESP through Instituto Nacional de Ciencia e Tecnologia-Informacao Quantica (INCT-IQ). DWB funded by ARC Future Fellowship (FT100100761). BCS funded by AITF, CIFAR, NSERC and USARO.

  18. Emergent unitarity in open quantum systems

    E-print Network

    David Layden; Eduardo Martin-Martinez; Achim Kempf

    2015-06-22

    We show that when a generic quantum system is coupled to a rapid succession of ancillas, the system's open dynamics can become unitary, evolving according to an effective Hamiltonian. This phenomenon can be used to simulate a broad family of unitary evolutions, and in many cases, to provide universal control of the system.

  19. Distributed snapshots: determining global states of distributed systems

    Microsoft Academic Search

    Leslie Lamport

    1985-01-01

    This paper presents an algorithm by which a process in a distributed system determines a global state of the system during a computation. Many problems in distributed systems can be cast in terms of the problem of detecting global states. For instance, the global state detection algorithm helps to solve an important class of problems: stable property detection. A stable

  20. Modeling distributed hybrid systems in Ptolemy II

    Microsoft Academic Search

    Jie Liu; Xiaojun Liu; Edward A. Lee

    2001-01-01

    We present Ptolemy II as a modeling and simulation environment for distributed hybrid systems. In Ptolemy II, a distributed hybrid system is specified as a hierarchy of models: an event-based top level and distributed islands of hybrid systems. Each hybrid system is in turn a hierarchy of continuous-time models and finite state machines. A variety of models of computation was

  1. Processor queueing disciplines in distributed systems

    Microsoft Academic Search

    Elizabeth Williams

    1984-01-01

    A distributed program consists of processes, many of which can execute concurrently on different processors in a distributed system of processors. When several processes from the same or different distributed programs have been assigned to a processor in a distributed system, the processor must select the next process to run. The following two questions are investigated: What is an appropriate

  2. Randomized control of open quantum systems

    E-print Network

    Lorenza Viola

    2006-01-16

    The problem of open-loop dynamical control of generic open quantum systems is addressed. In particular, I focus on the task of effectively switching off environmental couplings responsible for unwanted decoherence and dissipation effects. After revisiting the standard framework for dynamical decoupling via deterministic controls, I describe a different approach whereby the controller intentionally acquires a random component. An explicit error bound on worst-case performance of stochastic decoupling is presented.

  3. Video distribution system cost model

    NASA Technical Reports Server (NTRS)

    Gershkoff, I.; Haspert, J. K.; Morgenstern, B.

    1980-01-01

    A cost model that can be used to systematically identify the costs of procuring and operating satellite linked communications systems is described. The user defines a network configuration by specifying the location of each participating site, the interconnection requirements, and the transmission paths available for the uplink (studio to satellite), downlink (satellite to audience), and voice talkback (between audience and studio) segments of the network. The model uses this information to calculate the least expensive signal distribution path for each participating site. Cost estimates are broken downy by capital, installation, lease, operations and maintenance. The design of the model permits flexibility in specifying network and cost structure.

  4. Distributed Energy System Validation, Commissioning and

    E-print Network

    Distributed Energy System Validation, Commissioning and Qualification Test Report Prepared Agreement No. DE-FC26-06NT42847 Hawai`i Distributed Energy Resource Technologies for Energy Security Subtask................................................................................................................... 4 2.2 Sunny Boy PV Inverter System

  5. Distributed Computational Electromagnetics Systems Gang Chengy

    E-print Network

    Hawick, Ken

    Distributed Computational Electromagnetics Systems Gang Chengy Kenneth A. Hawicky Gerald Mortensenz Geo rey C. Foxy Abstract We describe our development of a \\real world" electromagnetic application on distributed computing systems. A computational electromagnetics (CEM) simulation for radar cross- section

  6. Quantum arrival time for open systems

    SciTech Connect

    Yearsley, J. M. [Blackett Laboratory, Imperial College, London SW7 2BZ (United Kingdom)

    2010-07-15

    We extend previous work on the arrival time problem in quantum mechanics, in the framework of decoherent histories, to the case of a particle coupled to an environment. The usual arrival time probabilities are related to the probability current, so we explore the properties of the current for general open systems that can be written in terms of a master equation of the Lindblad form. We specialize to the case of quantum Brownian motion, and show that after a time of order the localization time of the current becomes positive. We show that the arrival time probabilities can then be written in terms of a positive operator-valued measure (POVM), which we compute. We perform a decoherent histories analysis including the effects of the environment and show that time-of-arrival probabilities are decoherent for a generic state after a time much greater than the localization time, but that there is a fundamental limitation on the accuracy {delta}t, with which they can be specified which obeys E{delta}t>>({h_bar}/2{pi}). We confirm that the arrival time probabilities computed in this way agree with those computed via the current, provided there is decoherence. We thus find that the decoherent histories formulation of quantum mechanics provides a consistent explanation for the emergence of the probability current as the classical arrival time distribution, and a systematic rule for deciding when probabilities may be assigned.

  7. An Open Source Power System Analysis Toolbox

    Microsoft Academic Search

    PAT X

    This paper describes the Power System Analysis Toolbox (PSAT), an open source Matlab and GNU\\/Octave- based software package for analysis and design of small to medium size electric power systems. PSAT includes power flow, continuation power flow, optimal power flow, small signal stability analysis and time domain simulation as well as several static and dynamic models, including non-conventional loads, synchronous

  8. CS 6523 ( DISTRIBUTED SYSTEMS) Spring 2011

    E-print Network

    Chronopoulos, Anthony T.

    CS 6523 ( DISTRIBUTED SYSTEMS) Spring 2011 Course Instructor Professor: A. T. Chronopoulos, Email,W 19:00-20: 15 PM in Room AET 0.204.1 Textbook Distributed Systems: Concepts and Design (4th Edition and Contents A distributed system consists of an ensemble of independent computers whose software enables

  9. Simulation of Distributed Systems Fernando G. Gonzalez

    E-print Network

    Gonzalez, Fernando

    Simulation of Distributed Systems Fernando G. Gonzalez School of Electrical Engineering presents a methodology that allows the modeling of distributed discrete-event systems to be used in a single threaded simulation. It is assumed that the distributed system is described by a collection

  10. Distributed actuator reconfiguration in networked control systems

    E-print Network

    Johansson, Karl Henrik

    Distributed actuator reconfiguration in networked control systems Andr´e Teixeira, Jos´e Ara of distributed reconfiguration of first-order networked control systems under actuator faults. In particular, we, reconfigurable control, networked control systems, actuator networks, distributed optimization, large

  11. Experience with a Distributed File System Implementation

    E-print Network

    Anderson, Tom

    Experience with a Distributed File System Implementation Randolph Y. Wang and Thomas E. Anderson highlights some of the lessons learned during the course of implementing xFS, a fully distributed file system complex distributed programming issues than are faced by traditional client­server operating system

  12. Designing Distributed, Real-Time Systems

    E-print Network

    Mills, Kevin

    - - Designing Distributed, Real-Time Systems Kevin L. Mills INFT 796 SUMMER 1993 DIRECTED READINGS IN SOFTWARE ENGINEERING WITH DR. H. GOMAA GEORGE MASON UNIVERSITY #12;Designing Distributed, Real-Time Systems problem faced by designers of software systems, and particularly by designers of distributed, real-time

  13. THE SPATIAL DISTRIBUTION OF STARS IN OPEN CLUSTERS

    SciTech Connect

    Sanchez, Nestor; Alfaro, Emilio J. [Instituto de Astrofisica de Andalucia, CSIC, Apdo. 3004, E-18080, Granada (Spain)], E-mail: nestor@iaa.es

    2009-05-10

    The analysis of the distribution of stars in open clusters may yield important information on the star formation process and early dynamical evolution of stellar clusters. Here we address this issue by systematically characterizing the internal spatial structure of 16 open clusters in the Milky Way spanning a wide range of ages. Cluster stars have been selected from a membership probability analysis based on a nonparametric method that uses both positions and proper motions and does not make any a priori assumption on the underlying distributions. The internal structure is then characterized by means of the minimum spanning tree method (Q parameter), King profile fitting, and the correlation dimension (D{sub c} ) for those clusters with fractal patterns. On average, clusters with fractal-like structure are younger than those exhibiting radial star density profiles and an apparent trend between Q and age is observed in agreement with previous ideas about the dynamical evolution of the internal spatial structure of stellar clusters. However, some new results are obtained from a more detailed analysis: (1) a clear correlation between Q and the concentration parameter of the King model for those cluster with radial density profiles, (2) the presence of spatial substructure in clusters as old as {approx}100 Myr, and (3) a significant correlation between fractal dimension and age for those clusters with internal substructure. Moreover, the lowest fractal dimensions seem to be considerably smaller than the average value measured in galactic molecular cloud complexes.

  14. Open Quantum Systems with Loss and Gain

    NASA Astrophysics Data System (ADS)

    Eleuch, Hichem; Rotter, Ingrid

    2014-10-01

    We consider different properties of small open quantum systems coupled to an environment and described by a non-Hermitian Hamilton operator. Of special interest is the non-analytical behavior of the eigenvalues in the vicinity of singular points, the so-called exceptional points (EPs), at which the eigenvalues of two states coalesce and the corresponding eigenfunctions are linearly dependent from one another. The phases of the eigenfunctions are not rigid in approaching an EP and providing therewith the possibility to put information from the environment into the system. All characteristic properties of non-Hermitian quantum systems hold true not only for natural open quantum systems that suffer loss due to their embedding into the continuum of scattering wavefunctions. They appear also in systems coupled to different layers some of which provide gain to the system.Thereby gain and loss, respectively, may be fixed inside every layer, i.e. characteristic of it.

  15. Repeated interactions in open quantum systems

    SciTech Connect

    Bruneau, Laurent, E-mail: laurent.bruneau@u-cergy.fr [Laboratoire AGM, Université de Cergy-Pontoise, Site Saint-Martin, BP 222, 95302 Cergy-Pontoise (France); Joye, Alain, E-mail: Alain.Joye@ujf-grenoble.fr [Institut Fourier, UMR 5582, CNRS-Université Grenoble I, BP 74, 38402 Saint-Martin d’Hères (France); Merkli, Marco, E-mail: merkli@mun.ca [Department of Mathematics and Statistics Memorial University of Newfoundland, St. John's, NL Canada A1C 5S7 (Canada)

    2014-07-15

    Analyzing the dynamics of open quantum systems has a long history in mathematics and physics. Depending on the system at hand, basic physical phenomena that one would like to explain are, for example, convergence to equilibrium, the dynamics of quantum coherences (decoherence) and quantum correlations (entanglement), or the emergence of heat and particle fluxes in non-equilibrium situations. From the mathematical physics perspective, one of the main challenges is to derive the irreversible dynamics of the open system, starting from a unitary dynamics of the system and its environment. The repeated interactions systems considered in these notes are models of non-equilibrium quantum statistical mechanics. They are relevant in quantum optics, and more generally, serve as a relatively well treatable approximation of a more difficult quantum dynamics. In particular, the repeated interaction models allow to determine the large time (stationary) asymptotics of quantum systems out of equilibrium.

  16. OPEN PROBLEM: Spatially localized structures in dissipative systems: open problems

    NASA Astrophysics Data System (ADS)

    Knobloch, E.

    2008-04-01

    Stationary spatially localized structures, sometimes called dissipative solitons, arise in many interesting and important applications, including buckling of slender structures under compression, nonlinear optics, fluid flow, surface catalysis, neurobiology and many more. The recent resurgence in interest in these structures has led to significant advances in our understanding of the origin and properties of these states, and these in turn suggest new questions, both general and system-specific. This paper surveys these results focusing on open problems, both mathematical and computational, as well as on new applications.

  17. Distributed Power Balancing for the FREEDM System

    Microsoft Academic Search

    Ravi Akella; Fanjun Meng; Derek Ditch; Bruce McMillin; Mariesa Crow

    2010-01-01

    The FREEDM microgrid is a test bed for a smart grid integrated with Distributed Grid Intelligence (DGI) to efficiently manage the distribution and storage of renewable energy. Within the FREEDM system, DGI applies distributed algorithms in a unique way to achieve economically feasible utilization and storage of alternative energy sources in a distributed fashion. The FREEDM microgrid consists of residential

  18. PhD Recent Graduates with background in Distributed Systems. Virtualization, Distributed Systems, Application Servers or Operating Systems

    E-print Network

    Plotkin, Joshua B.

    PhD Recent Graduates with background in Distributed Systems. Virtualization, Distributed SystemsD in Computer Science * Must have knowledge/experience building virtual machines, distributed systems, Application Servers or Operating Systems Global Business Incubator Location ­ Palo Alto PURPOSE

  19. VAXcluster: a closely-coupled distributed system

    Microsoft Academic Search

    Nancy P. Kronenberg; Henry M. Levy; William D. Strecker

    1986-01-01

    A VAXcluster is a highly available and extensible configuration of VAX computers that operate as a single system. To achieve performance in a multicomputer environment, a new communications architecture, communications hardware, and distributed software were jointly designed. The software is a distributed version of the VAX\\/VMS operating system that uses a distributed lock manager to synchronize access to shared resources.

  20. A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS

    E-print Network

    Kozak, Victor R.

    A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS V.R. Kozak Budker Institute there was developed a distributed control system. The paper covers problems and possible solutions on the way. Typical and distributing panels between terminal equipment and control devices implemented in CAMAC standard. For avoiding

  1. A distributed program composition system

    NASA Technical Reports Server (NTRS)

    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.

  2. Open cycle ocean thermal energy conversion system

    Microsoft Academic Search

    Wittig; J. Michael

    1980-01-01

    An improved open cycle ocean thermal energy conversion system including a flash evaporator for vaporizing relatively warm ocean surface water and an axial flow, elastic fluid turbine having a vertical shaft and axis of rotation. The warm ocean water is transmitted to the evaporator through a first prestressed concrete skirt-conduit structure circumferentially situated about the axis of rotation. The unflashed

  3. Open cycle ocean thermal energy conversion system

    Microsoft Academic Search

    Wittig

    1980-01-01

    An improved open cycle ocean thermal energy conversion system includes a flash evaporator for vaporizing relatively warm ocean surface water and an axial flow, elastic fluid turbine having a vertical shaft and axis of rotation. The warm ocean water is transmitted to the evaporator through a first prestressed concrete skirt-conduit structure circumferentially situated about the axis of rotation. The unflashed

  4. Bringing Big Systems to Small Schools: Distributed Systems for Undergraduates

    E-print Network

    Albrecht, Jeannie

    Bringing Big Systems to Small Schools: Distributed Systems for Undergraduates Jeannie R. Albrecht or careers in industry. This paper describes an undergraduate course in Distributed Systems that not only studies the key design principles of distributed systems, but also has a unique emphasis on giving

  5. Automatic Software Upgrades for Distributed Systems

    E-print Network

    Ajmani, Sameer

    2005-11-30

    Upgrading the software of long-lived, highly-available distributed systems is difficult. It is not possible to upgrade all the nodes in a system at once, since some nodes may be unavailable and halting the system for an ...

  6. A reliability assessment methodology for distribution systems with distributed generation 

    E-print Network

    Duttagupta, Suchismita Sujaya

    2006-08-16

    Reliability assessment is of primary importance in designing and planning distribution systems that operate in an economic manner with minimal interruption of customer loads. With the advances in renewable energy sources, ...

  7. IDCDACS: IDC's Distributed Application Control System

    NASA Astrophysics Data System (ADS)

    Ertl, Martin; Boresch, Alexander; Kiani?ka, 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 applications. Due to decoupling by message queues the system is highly versatile and failure tolerant. The implementation utilizes the RabbitMQ open-source messaging platform that is based upon the Advanced Message Queuing Protocol (AMQP), an on-the-wire protocol (like HTML) and open industry standard. IDCDACS uses high availability capabilities provided by RabbitMQ and is equipped with failure recovery features to survive network and server outages. It is implemented in C and Python and is operated in a Linux environment at the IDC. Although IDCDACS was specifically designed for the existing IDC processing system its architecture is generic and reusable for different automatic processing workflows, e.g. similar to those described in (Olivieri et al. 2012, Kværna et al. 2012). Major advantages are its independence of the specific data processing applications used and the possibility to reconfigure IDCDACS for different types of processing, data and trigger logic. A possible future development would be to use the IDCDACS framework for different scientific domains, e.g. for processing of Earth observation satellite data extending the one-dimensional time-series intervals to spatio-temporal data cubes. REFERENCES Olivieri M., J. Clinton (2012) An almost fair comparison between Earthworm and SeisComp3, Seismological Research Letters, 83(4), 720-727. Kværna, T., S. J. Gibbons, D. B. Harris, D. A. Dodge (2012) Adapting pipeline architectures to track developing aftershock sequences and recurrent explosions, Proceedings of the 2012 Monitoring Research Review: Ground-Based Nuclear Explosion Monitoring Technologies, 776-785.

  8. An Open Source Power System Analysis Toolbox

    Microsoft Academic Search

    Federico Milano

    2005-01-01

    This paper describes the Power System Analysis Toolbox (PSAT), an open source Matlab and GNU\\/Octave-based software package for analysis and design of small to medium size electric power systems. PSAT includes power flow, continuation power flow, optimal power flow, small-signal stability analysis, and time-domain simulation, as well as several static and dynamic models, including nonconventional loads, synchronous and asynchronous machines,

  9. Open Source Real Time Operating Systems Overview

    Microsoft Academic Search

    Till Straumann; Till

    2001-01-01

    Modern control systems applications are often built on top of a real time\\u000aoperating system (RTOS) which provides the necessary hardware abstraction as\\u000awell as scheduling, networking and other services. Several open source RTOS\\u000asolutions are publicly available, which is very attractive, both from an\\u000aeconomic (no licensing fees) as well as from a technical (control over the\\u000asource code)

  10. An Open-Control Concept for a Holonic Multiagent System

    NASA Astrophysics Data System (ADS)

    Adam, Emmanuel; Berger, Thierry; Sallez, Yves; Trentesaux, Damien

    MAS are particularly adapted to deal with distributed and dynamic environment. The management of business workflow, or data flow, flexible manufacturing systems is typically a good application field for them. This kind of application requires centralization of the data control and flexibility to face with changes on the network. In the context of FMS, where products and resources entities can be seen as active, this paper presents the open-control concept and gives an example of its instantiation with holonic scheme. The open-control concept proposed in this paper exhibits the classic explicit control, as well as an innovative type of control called implicit control that allows system entities to be influenced via an Optimization Mechanism (OM). We illustrate our proposition by an implementation on a flexible assembly cell in our university.

  11. Open Source Real Time Operating Systems Overview

    SciTech Connect

    Straumann, Till

    2001-12-11

    Modern control systems applications are often built on top of a real time operating system (RTOS) which provides the necessary hardware abstraction as well as scheduling, networking and other services. Several open source RTOS solutions are publicly available, which is very attractive, both from an economic (no licensing fees) as well as from a technical (control over the source code) point of view. This contribution gives an overview of the RTLinux and RTEMS systems (architecture, development environment, API etc.). Both systems feature most popular CPUs, several APIs (including Posix), networking, portability and optional commercial support. Some performance figures are presented, focusing on interrupt latency and context switching delay.

  12. WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF

    E-print Network

    Mays, Larry W.

    CHAPTER 5 WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF SIMULATED ANNEALING Fred E. Goldman Arizona State University, Tempe, Arizona 5.1 INTRODUCTION The operation of water distribution systems affects the water quality in these systems. EPA regulations require that water quality be maintained

  13. Load balancing in homogeneous broadcast distributed systems

    Microsoft Academic Search

    Miron Livnyand; Myron Melman

    1982-01-01

    Three different load balancing algorithms for distributed systems that consist of a number of identical processors and a CSMA communication system are presented in this paper. Some of the properties of a multi-resource system and the balancing process are demonstrated by an analytic model. Simulation is used as a mean for studying the interdependency between the parameters of the distributed

  14. Distributed Information Systems Tailorability: A Component Approach

    Microsoft Academic Search

    Dimitrios Theotokis; Georgios-dimitrios Kapos; Costas Vassilakis; Anya Sotiropoulou; Georgios Gyftodimos

    1999-01-01

    Distributed software systems need to evolve according to the ever-changing requirements on which they were built. Software systems' tailorability can be achieved in terms of component software. Atoms and molecules the basic constructs of the ATOMA framework are the building blocks for distributed tailorable component-based software systems. These constructs can be considered as independent agents, that communicate in terms of

  15. Distributed multiparty desktop conferencing system: MERMAID

    Microsoft Academic Search

    Kazuo Watabe; Shiro Sakata; Kazutoshi Maeno; Hideyuki Fukuoka; Toyoko Ohmori

    1990-01-01

    This describes a distributed multiparty desktop conferencing system (MERMAID) and presents its preliminary brief evaluation, obtained as a result of daily use. MERMAID, which is designed based on group collaboration system architecture, provides an environment for widely distributed participants, seated at their desks, to hold real-time conferences by interchanging information through video, voice, and multimedia documents. This system is implemented

  16. Low jitter RF distribution system

    DOEpatents

    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.

  17. A Survey on Distributed File System Technology

    NASA Astrophysics Data System (ADS)

    Blomer, J.

    2015-05-01

    Distributed file systems provide a fundamental abstraction to location-transparent, permanent storage. They allow distributed processes to co-operate on hierarchically organized data beyond the life-time of each individual process. The great power of the file system interface lies in the fact that applications do not need to be modified in order to use distributed storage. On the other hand, the general and simple file system interface makes it notoriously difficult for a distributed file system to perform well under a variety of different workloads. This has lead to today's landscape with a number of popular distributed file systems, each tailored to a specific use case. Early distributed file systems merely execute file system calls on a remote server, which limits scalability and resilience to failures. Such limitations have been greatly reduced by modern techniques such as distributed hash tables, content-addressable storage, distributed consensus algorithms, or erasure codes. In the light of upcoming scientific data volumes at the exabyte scale, two trends are emerging. First, the previously monolithic design of distributed file systems is decomposed into services that independently provide a hierarchical namespace, data access, and distributed coordination. Secondly, the segregation of storage and computing resources yields to a storage architecture in which every compute node also participates in providing persistent storage.

  18. Intelligent Systems for Power Management and Distribution

    NASA Technical Reports Server (NTRS)

    Button, Robert M.

    2002-01-01

    The motivation behind an advanced technology program to develop intelligent power management and distribution (PMAD) systems is described. The program concentrates on developing digital control and distributed processing algorithms for PMAD components and systems to improve their size, weight, efficiency, and reliability. Specific areas of research in developing intelligent DC-DC converters and distributed switchgear are described. Results from recent development efforts are presented along with expected future benefits to the overall PMAD system performance.

  19. COORDINATING DISTRIBUTED INNOVATION PROCESSES: THE CASE OF THE AUTOMOTIVE AND OPEN SOURCE SOFTWARE INDUSTRIES

    Microsoft Academic Search

    Francesco Zirpoli; Francesco Rullani; Markus C. Becker

    2009-01-01

    This paper casts light on the question how coordination of distributed innovation processes is achieved by comparing the automotive and open source software industries. These industries represent very different settings of distributed innovation, one a traditional industries that has 'opened up' innovation, the other the extreme case of network innovation. They have not so far been object of a comparative

  20. A rule-based expert system for distribution system service restoration

    Microsoft Academic Search

    H. E. A. Talaat; S. El-Safty; M. M. Mansour; S. El-Debeiky

    1999-01-01

    This paper presents the application of a rule-based expert system to the service restoration of distribution networks. The principal objective of the developed restoration plan is to minimize the number of switching operations without violating loading constraints in all elements of the network while retaining its open loop structure. The obtained results are encouraging

  1. Programming languages for distributed computing systems

    Microsoft Academic Search

    Henri E. Bal; Jennifer G. Steiner; Andrew S. Tanenbaum

    1989-01-01

    When distributed systems first appeared, they were programmed in traditional sequential languages, usually with the addition of a few library procedures for sending and receiving messages. As distributed applications became more commonplace and more sophisticated, this ad hoc approach became less satisfactory. Researchers all over the world began designing new programming languages specifically for implementing distributed applications. These languages and

  2. Quantum to classical limit of open systems

    E-print Network

    Guido Bellomo; Mario Castagnino; Sebastian Fortin

    2015-04-09

    We present a complete review of the quantum-to-classical limit of open systems by means of the theory of decoherence and the use of the Weyl-Wigner-Moyal (WWM) transformation. We show that the analytical extension of the Hamiltonian provides a set of poles that can be used to (a) explain the non-unitary evolution of the relevant system and (b) completely define the set of preferred states that constitute the mixture into which the system decoheres: the Moving Preferred Basis. Moreover, we show that the WWM of these states are the best candidates to obtain the trajectories in the classical phase-space.

  3. Adiabatic Quantum Computation in Open Systems

    E-print Network

    M. S. Sarandy; D. A. Lidar

    2005-12-16

    We analyze the performance of adiabatic quantum computation (AQC) under the effect of decoherence. To this end, we introduce an inherently open-systems approach, based on a recent generalization of the adiabatic approximation. In contrast to closed systems, we show that a system may initially be in an adiabatic regime, but then undergo a transition to a regime where adiabaticity breaks down. As a consequence, the success of AQC depends sensitively on the competition between various pertinent rates, giving rise to optimality criteria.

  4. Impact of high penetration residential PV systems on distribution systems

    Microsoft Academic Search

    M. E. Baran; H. Hooshyar; Z. Shen; J. Gajda; K. M. M. Huq

    2011-01-01

    This paper investigates the operation and protection issues on a distribution system with high penetration of residential PV systems. PV systems are smaller scale resources and therefore they have different impact on a distribution circuit than larger scale resources. The paper indeed considers a typical residential feeder and investigates PV system impacts on the system at different penetration levels. Simulations

  5. Implementation of genetic algorithm for distribution systems loss minimum re-configuration

    Microsoft Academic Search

    Koichi Nara; Atsushi Shiose; Minoru Kitagawa; Toshihisa Ishihara

    1992-01-01

    The loss minimum reconfiguration problem in the open loop radial distribution system is basically one of complex combinatorial optimization, since the normal open sectionalizing switches must be determined appropriately. The genetic algorithm was successfully applied to the loss minimum reconfiguration problem. In the proposed algorithm, strings consist of sectionalizing switch status or radial configurations, and the fitness function consists of

  6. Frequency distribution of coliforms in water distribution systems.

    PubMed

    Christian, R R; Pipes, W O

    1983-02-01

    Nine small water distribution systems were sampled intensively to determine the patterns of dispersion of coliforms. The frequency distributions of confirmed coliform counts were compatible with either the negative-binomial or the lognormal distribution. They were not compatible with either the Poisson or Poisson-plus-added zeroes distribution. The implications of the use of the lognormal distributional model were further evaluated because of its previous use in water quality studies. The geometric means from 14 data sets ranged from 10(-6) to 0.2 coliforms per 100 ml, and the geometric standard deviations were between 10 and 100, with one exception. If the lognormal model is representative of the coliform distribution; the arithmetic mean sample count is a poor estimator of the true mean coliform density, and the probability of water in a distribution system containing small patches with large coliform densities without detection by routine monitoring is finite. These conclusions have direct bearing on the interpretation of microbiological quality standards for drinking water. PMID:6830219

  7. An Open System for Intravascular Ultrasound Imaging

    PubMed Central

    Qiu, Weibao; Chen, Yan; Li, Xiang; Yu, Yanyan; Cheng, Wang Fai; Tsang, Fu Keung; Zhou, Qifa; Shung, K. Kirk; Dai, Jiyan; Sun, Lei

    2013-01-01

    Visualization of the blood vessels can provide valuable morphological information for diagnosis and therapy strategies for cardiovascular disease. Intravascular ultrasound (IVUS) is able to delineate internal structures of vessel wall with fine spatial resolution. However, the developed IVUS is insufficient to identify the fibrous cap thickness and tissue composition of atherosclerotic lesions. Novel imaging strategies have been proposed, such as increasing the center frequency of ultrasound or using a modulated excitation technique to improve the accuracy of diagnosis. Dual-mode tomography combining IVUS with optical tomography has also been developed to determine tissue morphology and characteristics. The implementation of these new imaging methods requires an open system that allows users to customize the system for various studies. This paper presents the development of an IVUS system that has open structures to support various imaging strategies. The system design is based on electronic components and printed circuit board, and provides reconfigurable hardware implementation, programmable image processing algorithms, flexible imaging control, and raw RF data acquisition. In addition, the proposed IVUS system utilized a miniaturized ultrasound transducer constructed using PMN-PT single crystal for better piezoelectric constant and electromechanical coupling coefficient than traditional lead zirconate titanate (PZT) ceramics. Testing results showed that the IVUS system could offer a minimum detectable signal of 25 ?V, allowing a 51 dB dynamic range at 47 dB gain, with a frequency range from 20 to 80 MHz. Finally, phantom imaging, in vitro IVUS vessel imaging, and multimodality imaging with photoacoustics were conducted to demonstrate the performance of the open system. PMID:23143570

  8. The Digital Distributed System Security Architecture

    Microsoft Academic Search

    Andy Goldstein; Butler Lampson; Charlie Kaufman; Morrie Gasser

    1989-01-01

    The Digital Distributed System Security Architecture is a comprehensive specification for security in a distributed system that employs state-of-the-art concepts to address the needs of both commercial and government environments. The architecture covers user and system authentication, mandatory and discretionary security, secure initialization and loading, and delegation in a general-purpose computing environment of heterogeneous systems where there are no central

  9. Digital time stamping system based on open source technologies

    Microsoft Academic Search

    R. Miskinis; D. Smirnov; E. Urba; A. Burokas; B. Malysko; P. Laud; F. Zuliani

    2009-01-01

    A digital time stamping system (the BALTICTIME system) was developed by using the open source technologies and was adopted to meet the egovernmental applications, where legal and accountable time stamps are essential. All components of the BALTICTIME system were developed by using the open source software technologies LINUX-UBUNTU, OpenTSA, OpenSSL, MySQL and are designed to suit the hardware, which is

  10. The Clouds Distributed Operating System * Partha Dasgupta

    E-print Network

    Yeom, Heon Young

    ,dispensingwith the need for facilities such as file systems. Though the hardware may be distributed, Clouds provides A distributed operating system is a control program running on a set of computers that are interconnected by a network. This control program unifies the different computers into a single integrated compute and storage

  11. Distributed Deadlock Detection in Mobile Agent Systems

    Microsoft Academic Search

    Bruce Ashfield; Dwight Deugo; Franz Oppacher; Tony White

    2002-01-01

    Mobile agent systems have unique properties and characteristics and represent a new application development paradigm. Existing solutions to distributed computing problems, such as deadlock avoidance algorithms, are not suited to environments where both clients and servers move freely through the network. This paper describes a distributed deadlock solution for use in mobile agent systems. The properties of this solution are

  12. Troubleshooting Distributed Systems via Data Mining

    Microsoft Academic Search

    David A. Cieslak; Douglas Thain; Nitesh V. Chawla

    2006-01-01

    Through massive parallelism, distributed systems enable the multiplication of productivity. Unfortunately, increasing the scale of available machines to users will also multiply debugging when failure occurs. Data mining allows the extraction of patterns within large amounts of data and therefore forms the foundation for a useful method of debugging, particularly within such distributed systems. This paper outlines a successful application

  13. BIOFILMS IN DRINKING WATER DISTRIBUTION SYSTEMS

    EPA Science Inventory

    Virtually anywhere a surface comes into contact with the water in a distribution system, one can find biofilms. Biofilms are formed in distribution system pipelines when microbial cells attach to pipe surfaces and multiply to form a film or slime layer on the pipe. Probably withi...

  14. LIQUID AND GASEOUS FUEL DISTRIBUTION SYSTEM

    EPA Science Inventory

    The report describes the national liquid and gaseous fuel distribution system. he study leading to the report was performed as part of an effort to better understand emissions of volatile organic compounds from the fuel distribution system. he primary, secondary, and tertiary seg...

  15. THE LIQUID AND GASEOUS FUEL DISTRIBUTION SYSTEM

    EPA Science Inventory

    The report describes the national liquid and gaseous fuel distribution system. he study leading to the report was performed as part of an effort to better understand emissions of volatile organic compounds from the fuel distribution system. he primary, secondary, and tertiary seg...

  16. A modified development process for distributed systems

    Microsoft Academic Search

    Javier Andrade; Juan Ares; Rafael Garcia; Santiago Rodriguez

    2001-01-01

    Distributed systems are increasing their presence in daily activities, such as shopping with Visa card or withdrawing money from a cash machine, and their complexity. This situation suggests special attention when distributed systems are considered. Their inherent characteristics affect directly not only the obtained software, but also to the development process followed. The main problems in the development of this

  17. Open quantum systems and Dicke superradiance

    NASA Astrophysics Data System (ADS)

    Eleuch, Hichem; Rotter, Ingrid

    2014-03-01

    We study generic features of open quantum systems embedded into a continuum of scattering wavefunctions and compare them with results discussed in optics. A dynamical phase transition may appear at high level density in a many-level system and also in a two-level system if the coupling W to the environment is complex and sufficiently large. Here nonlinearities occur. When W ij is imaginary, two singular (exceptional) points may exist. In the parameter range between these two points, width bifurcation occurs as function of a certain external parameter. A unitary representation of the S matrix allows to calculate the cross section for a two-level system, including at the exceptional point (double pole of the S matrix). The results obtained for the transition of level repulsion at small (real) W ij to width bifurcation at large (imaginary) W ij show qualitatively the same features that are observed experimentally in the transition from Autler-Townes splitting to electromagnetically induced transparency in optics. Fermi's golden rule holds only below the dynamical phase transition while it passes into an anti-golden rule beyond this transition. The results are generic and can be applied to the response of a complex open quantum system to the action of an external field (environment). They may be considered as a guideline for engineering and manipulating quantum systems in such a way that they can be used for applications with special requirements.

  18. A Formal Model of Provenance in Distributed Systems

    E-print Network

    Francalanza, Adrian

    A Formal Model of Provenance in Distributed Systems Issam Souilah2 Adrian Francalanza1 Vladimiro;Motivation Trust In a Distributed System #12;Motivation Trust In a Distributed System Distribution inherent parallelism. #12;Motivation Trust In a Distributed System Distribution inherent parallelism. Distribution

  19. Quantum localization in open chaotic systems

    NASA Astrophysics Data System (ADS)

    Ryu, Jung-Wan; Hur, G.; Kim, Sang Wook

    2008-09-01

    We study a quasibound state of a ? -kicked rotor with absorbing boundaries focusing on the nature of the dynamical localization in open quantum systems. The localization lengths ? of lossy quasibound states located near the absorbing boundaries decrease as they approach the boundary while the corresponding decay rates ? are dramatically enhanced. We find the relation ?˜?-1/2 and explain it based upon the finite time diffusion, which can also be applied to a random unitary operator model. We conjecture that this idea is valid for the system exhibiting both the diffusion in classical dynamics and the exponential localization in quantum mechanics.

  20. Fluctuations of work in nearly adiabatically driven open quantum systems

    NASA Astrophysics Data System (ADS)

    Suomela, S.; Salmilehto, J.; Savenko, I. G.; Ala-Nissila, T.; Möttönen, M.

    2015-02-01

    We extend the quantum jump method to nearly adiabatically driven open quantum systems in a way that allows for an accurate account of the external driving in the system-environment interaction. Using this framework, we construct the corresponding trajectory-dependent work performed on the system and derive the integral fluctuation theorem and the Jarzynski equality for nearly adiabatic driving. We show that such identities hold as long as the stochastic dynamics and work variable are consistently defined. We numerically study the emerging work statistics for a two-level quantum system and find that the conventional diabatic approximation is unable to capture some prominent features arising from driving, such as the continuity of the probability density of work. Our results reveal the necessity of using accurate expressions for the drive-dressed heat exchange in future experiments probing jump time distributions.

  1. Simulation Of Next Generation Systems Computational Science of Distributed Systems

    E-print Network

    Bonaventure, Olivier

    Simulation Of Next Generation Systems Computational Science of Distributed Systems Martin QuinsonGrid Valid Scalable Usable Clouds CC 1/21 #12;Our Scientific Objects: Distributed Systems Cloud Computing" Objects Other sciences routinely use computers to understand complex systems Claim: Simulation is both

  2. Detecting data anomalies methods in distributed systems

    NASA Astrophysics Data System (ADS)

    Mosiej, Lukasz

    2009-06-01

    Distributed systems became most popular systems in big companies. Nowadays many telecommunications companies want to hold large volumes of data about all customers. Obviously, those data cannot be stored in single database because of many technical difficulties, such as data access efficiency, security reasons, etc. On the other hand there is no need to hold all data in one place, because companies already have dedicated systems to perform specific tasks. In the distributed systems there is a redundancy of data and each system holds only interesting data in appropriate form. Data updated in one system should be also updated in the rest of systems, which hold that data. There are technical problems to update those data in all systems in transactional way. This article is about data anomalies in distributed systems. Avail data anomalies detection methods are shown. Furthermore, a new initial concept of new data anomalies detection methods is described on the last section.

  3. Universal simulation of Markovian open quantum systems

    NASA Astrophysics Data System (ADS)

    Sweke, Ryan; Sinayskiy, Ilya; Bernard, Denis; Petruccione, Francesco

    2015-06-01

    We consider the problem of constructing a "universal set" of Markovian processes, such that any Markovian open quantum system, described by a one-parameter semigroup of quantum channels, can be simulated through sequential simulations of processes from the universal set. In particular, for quantum systems of dimension d , we explicitly construct a universal set of semigroup generators, parametrized by d2-3 continuous parameters, and prove that a necessary and sufficient condition for the dynamical simulation of a d -dimensional Markovian quantum system is the ability to implement (a) quantum channels from the semigroups generated by elements of the universal set of generators, and (b) unitary operations on the system. Furthermore, we provide an explicit algorithm for simulating the dynamics of a Markovian open quantum system using this universal set of generators, and show that it is efficient, with respect to this universal set, when the number of distinct Lindblad operators (representing physical dissipation processes) scales polynomially with respect to the number of subsystems.

  4. Design and Implementation of Ceph: A Scalable Distributed File System

    SciTech Connect

    Weil, S A; Brandt, S A; Miller, E L; Long, D E; Maltzahn, C

    2006-04-19

    File system designers continue to look to new architectures to improve scalability. Object-based storage diverges from server-based (e.g. NFS) and SAN-based storage systems by coupling processors and memory with disk drives, delegating low-level allocation to object storage devices (OSDs) and decoupling I/O (read/write) from metadata (file open/close) operations. Even recent object-based systems inherit decades-old architectural choices going back to early UNIX file systems, however, limiting their ability to effectively scale to hundreds of petabytes. We present Ceph, a distributed file system that provides excellent performance and reliability with unprecedented scalability. Ceph maximizes the separation between data and metadata management by replacing allocation tables with a pseudo-random data distribution function (CRUSH) designed for heterogeneous and dynamic clusters of unreliable OSDs. We leverage OSD intelligence to distribute data replication, failure detection and recovery with semi-autonomous OSDs running a specialized local object storage file system (EBOFS). Finally, Ceph is built around a dynamic distributed metadata management cluster that provides extremely efficient metadata management that seamlessly adapts to a wide range of general purpose and scientific computing file system workloads. We present performance measurements under a variety of workloads that show superior I/O performance and scalable metadata management (more than a quarter million metadata ops/sec).

  5. Man-systems distributed system for Space Station Freedom

    NASA Technical Reports Server (NTRS)

    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.

  6. DISTRIBUTED HYDROGEN FUELING SYSTEMS ANALYSIS

    Microsoft Academic Search

    John P. Reardon; Franklin D. Lomax; Jennifer Pinyan; Ira F. Kuhn

    2001-01-01

    Directed Technologies Inc. has analyzed the costs and other attributes of three fuel infrastructure systems to support fuel cell vehicles: hydrogen, methanol and gasoline. This work compliments previous DTI analyses of onboard fuel system costs for these three fuels B onboard hydrogen storage systems in the case of hydrogen, and onboard fuel processors for methanol and for gasoline. The results

  7. Test and measurement on quantum key distribution systems

    NASA Astrophysics Data System (ADS)

    Tomita, Akihisa

    2009-01-01

    As in conventional communication systems, test and measurement play important roles in quantum key distribution (QKD) systems. Besides the observation that QKD protocols estimate the bound of information leakage from the measurement results on the transmission channel, test of quantum apparatus is necessary to ensure that the assumptions behind the security proof are satisfied in practice. Moreover, precise characterization of the device imperfection improves the final key rate, because one can specify the effect of the errors originated from the devices and sbtract it. However, careful consideration is required to guarantee that the test and measurement procedure will not open a loop-hole to the eavesdroppers.

  8. Vision for an Open, Global Greenhouse Gas Information System (GHGIS)

    NASA Astrophysics Data System (ADS)

    Duren, R. M.; Butler, J. H.; Rotman, D.; Ciais, P.; Greenhouse Gas Information System Team

    2010-12-01

    Over the next few years, an increasing number of entities ranging from international, national, and regional governments, to businesses and private land-owners, are likely to become more involved in efforts to limit atmospheric concentrations of greenhouse gases. In such a world, geospatially resolved information about the location, amount, and rate of greenhouse gas (GHG) emissions will be needed, as well as the stocks and flows of all forms of carbon through the earth system. The ability to implement policies that limit GHG concentrations would be enhanced by a global, open, and transparent greenhouse gas information system (GHGIS). An operational and scientifically robust GHGIS would combine ground-based and space-based observations, carbon-cycle modeling, GHG inventories, synthesis analysis, and an extensive data integration and distribution system, to provide information about anthropogenic and natural sources, sinks, and fluxes of greenhouse gases at temporal and spatial scales relevant to decision making. The GHGIS effort was initiated in 2008 as a grassroots inter-agency collaboration intended to identify the needs for such a system, assess the capabilities of current assets, and suggest priorities for future research and development. We will present a vision for an open, global GHGIS including latest analysis of system requirements, critical gaps, and relationship to related efforts at various agencies, the Group on Earth Observations, and the Intergovernmental Panel on Climate Change.

  9. Development of an Integrated Distribution Management System

    SciTech Connect

    Schatz, Joe E.

    2010-10-20

    This final report details the components, functionality, costs, schedule and benefits of developing an Integrated Distribution Management System (IDMS) for power distribution system operation. The Distribution Automation (DA) and Supervisory Control and Data Acquisition (SCADA) systems used by electric power companies to manage the distribution of electric power to retail energy consumers are vital components of the Nation’s critical infrastructure. Providing electricity is an essential public service and a disruption in that service, if not quickly restored, could threaten the public safety and the Nation’s economic security. Our Nation’s economic prosperity and quality of life have long depended on the essential services that utilities provide; therefore, it is necessary to ensure that electric utilities are able to conduct their operations safely and efficiently. A fully integrated technology of applications is needed to link various remote sensing, communications and control devices with other information tools that help guide Power Distribution Operations personnel. A fully implemented IDMS will provide this, a seamlessly integrated set of applications to raise electric system operating intelligence. IDMS will enhance DA and SCADA through integration of applications such as Geographic Information Systems, Outage Management Systems, Switching Management and Analysis, Operator Training Simulator, and other Advanced Applications, including unbalanced load flow and fault isolation/service restoration. These apps are capable of utilizing and obtaining information from appropriately installed DER, and by integrating disparate systems, the Distribution Operators will benefit from advanced capabilities when analyzing, controlling and operating the electric system.

  10. A distributed data component for the open modeling interface

    Technology Transfer Automated Retrieval System (TEKTRAN)

    As the volume of collected data continues to increase in the environmental sciences, so does the need for effective means for accessing those data. We have developed an Open Modeling Interface (OpenMI) data component that retrieves input data for model components from environmental information syste...

  11. The FLOSSWALD Information System on Free and Open Source Software

    Microsoft Academic Search

    Meike Reichle; Alexandre Hanft

    2006-01-01

    We propose the implementation of an intelligent information system on free and open source soft- ware. This system will consist of a case-based reasoning (CBR) system and several machine learning modules to maintain the knowledge base and train the CBR system thus enhancing its per- formance. Our knowledge base will include data on free and open source software provided by

  12. ON THE USE OF WEB SERVICES FOR BUILDING DISTRIBUTED AUTOMATION SYSTEMS

    Microsoft Academic Search

    MITKO SHOPOV; HRISTO MATEV; GRISHA SPASOV

    2006-01-01

    The paper discusses the applicability of Web services for building distributed automation systems and the benefits they bring. An adaptation of some of the well- proven enterprise architecture models and their applicability in distributed measurement is presented. The presented sample implementation is based on open and standardized approaches - high-level programming languages, object-oriented platforms, Internet technologies, and standardized communication interfaces.

  13. Development of intelligent distribution automation system

    Microsoft Academic Search

    B. N. Ha; S. W. Lee; C. H. Shin; S. C. Kwon; S. Y. Park; M. H. Park

    2009-01-01

    Intelligent distribution automation system(IDAS) was designed to control and monitor the facilities from substation to customer and distributed resources. These facilities have the sensors inside main switchgear equipment that contains ECT, EVT, partial discharge sensor, temperature sensor, water detection sensor, displacement sensor, gas density sensor and so on. It been developed and installed in the testing center of Korea Electric

  14. Distributed state reconstruction for discrete event systems

    Microsoft Academic Search

    Eric Fabre; Albert Benveniste; Claude Jard; Laurie Ricker; Mark Smith

    2000-01-01

    We consider the state estimation problem for stochastic discrete event dynamic system (DEDS) obtained by the parallel composition of several subsystems. A distributed inference algorithm is developed in the case of distributed observations. It is composed of asynchronous agents that only have a local view of the model and of observations. This algorithm only handles local states of subsystems, which

  15. Distributed Administrative Management Information System (DAMIS).

    ERIC Educational Resources Information Center

    Juckiewicz, Robert; Kroculick, Joseph

    Columbia University's major program to distribute its central administrative data processing to its various schools and departments is described. The Distributed Administrative Management Information System (DAMIS) will link every department and school within the university via micrcomputers, terminals, and/or minicomputers to the central…

  16. Distributed Adaptive Networked System for Strain Mapping

    Microsoft Academic Search

    Jian Liang; Maryna Lishchynska; Kieran Delaney

    2009-01-01

    Separately, context-aware sensing and networked sensing systems have been fast progressing research domains. The emergence of wireless sensor networks (WSN) has introduced a way of implementing a distributed self-organized intelligence in myriads of sensing applications. In this work, WSN and sensing technologies are combined to monitor behavior of a target object. The paper presents design and implementation of a distributed

  17. BIOFILM IN DRINKING WATER DISTRIBUTION SYSTEMS

    EPA Science Inventory

    Throughout the world there are millions of miles of water distribution pipe lines which provide potable water for use by individuals and industry. Some of these water distribution systems have been in service well over one hundred years. Treated water moving through a distributio...

  18. Distributing Executive Information Systems through Networks.

    ERIC Educational Resources Information Center

    Penrod, James I.; And Others

    1993-01-01

    Many colleges and universities will soon adopt distributed systems for executive information and decision support. Distribution of shared information through computer networks will improve decision-making processes dramatically on campuses. Critical success factors include administrative support, favorable organizational climate, ease of use,…

  19. A PILOT ENVIRONMENTAL DATA GRID DISTRIBUTION SYSTEM

    EPA Science Inventory

    The primary objectives of this study are to implement, operate, and evaluate a workable, distributed data access, format neutral "data-on-demand" prototype, leveraging leading-edge technologies assembled in a unique operational prototype system and distributed over the U.S. EPA's...

  20. Simulation-Based Testing of Distributed Systems

    Microsoft Academic Search

    Matthew J. Rutherford; Antonio Carzaniga; Alexander L. Wolf

    2006-01-01

    Developers of distributed systems routinely construct discrete-event simulations to help them un- derstand and evaluate the behavior of inter-component protocols. Typically written using an imperative programming language, these simulations capture basic algorithmic functionality at the same time as they focus attention on properties critical to distribution, including topology, timing, bandwidth, and overall scalability. We ask the following question: Can simulations

  1. A Distributed System for Cooperative MIMO Transmissions

    E-print Network

    Kalyanaraman, Shivkumar

    a distributed system for facilitating cooperative MIMO transmissions in networks without multiple antenna. At the physical layer, MIMO systems use multiple antennas to achieve spatial diversity. However, MIMO systems require multi-antennas devices, which may not be feasible in some devices due to cost and size limitations

  2. Distributed control system for active mirrors

    Microsoft Academic Search

    Luis F. Rodriguez-Ramos; Mark R. Williams; Javier Castro; A. Cruz; Juan C. Gonzalez; Brian Mack; Carlos Martin; German Pescador; Vicente Sanchez; Nicolas A. Sosa

    1994-01-01

    This paper presents the IAC (Instituto de Astrofisica de Canaries, Spain) proposal of a distributed control system intended for the active support of a 8 m mirror. The system incorporates a large number of compact `smart' force actuators, six force definers, and a mirror support computer (MSC) for interfacing with the telescope control system and for general housekeeping. We propose

  3. Proactive Fault-Recovery in Distributed Systems

    E-print Network

    Narasimhan, Priya

    1 Proactive Fault-Recovery in Distributed Systems by Soila M. Pertet A dissertation submitted #12;2 Abstract Supporting both real-time and fault-tolerance properties in systems is challenging in order to meet task dead- lines. However, system failures, which are typically unanticipated events, can

  4. A distributed test system for pipelined ADCs

    Microsoft Academic Search

    E. Mancini; S. Rapuano; D. Dallet

    2008-01-01

    The paper presents a distributed test system for pipelined ADCs including a model- based characterization process. A set of modular Virtual Instruments has been de- veloped in Java to execute the system functions in order to be remotely manageable through a common Internet browser. The system features include (i) a module able in modeling an ADC through the specialization of

  5. Economics inspired decentralized distributed systems Leandro Navarro

    E-print Network

    Baeza-Yates, Ricardo

    to understand the challenges and find solutions. In contrast to the autonomic nervous system or biologicalEconomics inspired decentralized distributed systems Leandro Navarro Universidad Politècnica de Catalunya Barcelona Abstract: Large scale systems can have an arbitrarily large, diverse and widespread set

  6. A distributed building evacuation system

    E-print Network

    Qumsiyeh, Dany M

    2008-01-01

    This thesis investigates the feasibility of a smart building evacuation system, capable of guiding occupants along safe paths to exits and responding to changing threats. Inspired by developments in amorphous computing, ...

  7. A Distributed Building Evacuation System

    E-print Network

    Qumsiyeh, Dany M.

    2008-07-14

    This thesis investigates the feasibility of a smart building evacuation system, capable of guiding occupants along safe paths to exits and responding to changing threats. Inspired by developments in amorphous computing, ...

  8. EDOS: Environment for the Development and Distribution of Open Source Software

    Microsoft Academic Search

    Serge Abiteboul; Xavier Leroy; Boris Vrdoljak; Ciarán Bryce; Roberto Di Cosmo; Klaus R. Dittrich; Stéfane Fermigier; Tova Milo; Assaf Sagi; Yotam Shtossel; Stéphane Laurière; Frédéric Lepied; Radu Pop; Florent Villard; Eleonora Panto

    The open-source software community is now comprised of a very large and growing number of contributors and users. The GNU\\/Linux operating system for instance has an estimated 18 million users worldwide and its contributing developers can be counted by thousands. The critical mass of contributors taking part in various open- source projects has helped to ensure high quality for open

  9. Distributed Monitoring of Concurrent and Asynchronous Systems

    Microsoft Academic Search

    Albert Benveniste; Stefan Haar; Eric Fabre; Claude Jard

    2003-01-01

    Abstract. In this paper we study the diagnosis of distributed asynchronous,systems,with concurrency. Diagnosis is performed,by a peer-to-peer distributed architecture of supervisors. Our approach relies on Petri net unfoldings and event structures, as means to manipulate trajectories of systems with concurrency. This article is an extended version of the paper with same title, which appeared as a plenary address in the

  10. Large-scale auroral distribution and the open-field-line region

    SciTech Connect

    Murphree, J.; Anger, C.; Meng, C.I.; Akasofu, S.

    1984-01-01

    An example of global auroral distribution is presented that is clearly more circular than oval and is thus fit to an offset circle. The area surrounded by the aurora is also compared with the open region constructed by a model of the open magnetosphere for the IMF condition about 1 h prior to the auroral observation.

  11. Distributed distribution energy management system (DDEMS) exploratory experiments

    SciTech Connect

    Sheble, G.B. (Iowa State Univ. of Science and Technology, Ames, IA (United States))

    1991-01-01

    Recent trends in the energy management system (EMS) industry have shown a marked change with the advent of the microprocessor and the workstation. However, the impact of tools to bring the {ital PC revolution} into the power system industry has just begun. It is increasingly obvious that the change is more extensive than previously imagined. Trends to smaller software houses, product-oriented small businesses, and independent consultants are just indicators of the on-going {ital revolution}. All three groups are marketing viable products and services to integrate all utility areas into a cohesive business-oriented information management system (IMS). Utilities must address the skillful use of all three resources in the near future. This article presents an example of an in-house solution to a distribution automation system and then presents several experiments to identify the types of tools needed to implement a commercial-grade system with in-house staff.

  12. A remote monitoring system for Open Ocean Aquaculture

    Microsoft Academic Search

    A. P. M. Michel; K. L. Croff; K. W. McLetchie; J. D. Irish

    2002-01-01

    The purpose of this project was to determine the practicality and characteristics of a remote monitoring system for an open ocean aquaculture fish cage. The Open Ocean Aquaculture program at the University of New Hampshire currently uses two fish cages to develop the technology and methodology to raise finned fish in the open ocean. The cages are located about six

  13. Opis: Reliable Distributed Systems in OCaml

    Microsoft Academic Search

    Pierre-'Evariste Dagand; Dejan Kosti'c; Viktor Kuncak

    2009-01-01

    Concurrency and distribution pose algorithmic and implementation\\u000a challenges in developing reliable distributed systems, making the\\u000a field an excellent testbed for evaluating programming language and\\u000a verification paradigms. Several specialized\\u000a domain-specific languages and extensions of memory-unsafe languages\\u000a were proposed to aid distributed system development. \\u000a We present an alternative to these approaches, showing that\\u000a modern, higher-order, strongly typed, memory safe languages provide\\u000a an

  14. Studying distribution system reliability against lightning

    SciTech Connect

    Romualdo, C.; Brito, F.; Perez, H.; De la Rosa, F.; Sarmiento, H.G.

    1989-01-01

    In this article, the authors present a general overview of the use of computers in different areas of a research project intended to study the adequate protection of distribution systems against lightning. First, the effects of lightning on electric power distribution will be presented; then, a discussion on the modeling of lightning phenomena and other areas that are needed to perform analytical studies to predict distribution system reliability against lightning will be given. Subsequently, a brief description will be given of field measurements of ground flash density and lightning location. Finally, we will enumerate areas that have been identified as requiring further research.

  15. Lightning protection of distribution systems. Final report

    SciTech Connect

    Uman, M.A.

    1985-02-01

    Analyses are presented of experimental data obtained in the Tampa Bay area during 1978 and 1979 concerning the physical and phenomenological properties of lightning and the interaction of that lightning with the local distribution power systems. Specific results are given regarding: (1) the physical and phenomenology properties of lightning in the Tampa Bay area and its relation to lightning elsewhere; (2) measurement and theory concerning lightning-induced voltages on distribution lines; (3) distribution system operation in the presence of lightning and analytical modeling and prediction of that operation.

  16. Quantum Speed Limits in Open System Dynamics

    NASA Astrophysics Data System (ADS)

    del Campo, A.; Egusquiza, I. L.; Plenio, M. B.; Huelga, S. F.

    2013-02-01

    Bounds to the speed of evolution of a quantum system are of fundamental interest in quantum metrology, quantum chemical dynamics, and quantum computation. We derive a time-energy uncertainty relation for open quantum systems undergoing a general, completely positive, and trace preserving evolution which provides a bound to the quantum speed limit. When the evolution is of the Lindblad form, the bound is analogous to the Mandelstam-Tamm relation which applies in the unitary case, with the role of the Hamiltonian being played by the adjoint of the generator of the dynamical semigroup. The utility of the new bound is exemplified in different scenarios, ranging from the estimation of the passage time to the determination of precision limits for quantum metrology in the presence of dephasing noise.

  17. Integrating CLIPS applications into heterogeneous distributed systems

    NASA Technical Reports Server (NTRS)

    Adler, Richard M.

    1991-01-01

    SOCIAL is an advanced, object-oriented development tool for integrating intelligent and conventional applications across heterogeneous hardware and software platforms. SOCIAL defines a family of 'wrapper' objects called agents, which incorporate predefined capabilities for distributed communication and control. Developers embed applications within agents and establish interactions between distributed agents via non-intrusive message-based interfaces. This paper describes a predefined SOCIAL agent that is specialized for integrating C Language Integrated Production System (CLIPS)-based applications. The agent's high-level Application Programming Interface supports bidirectional flow of data, knowledge, and commands to other agents, enabling CLIPS applications to initiate interactions autonomously, and respond to requests and results from heterogeneous remote systems. The design and operation of CLIPS agents are illustrated with two distributed applications that integrate CLIPS-based expert systems with other intelligent systems for isolating and mapping problems in the Space Shuttle Launch Processing System at the NASA Kennedy Space Center.

  18. Building a generalized distributed system model

    NASA Technical Reports Server (NTRS)

    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. Detecting Flow Anomalies in Distributed Systems

    E-print Network

    Chua, Freddy Chong Tat; Huberman, Bernardo A

    2014-01-01

    Deep within the networks of distributed systems often contain anomalies that affect its efficiency and performance. These anomalies are difficult to detect because the distributed systems may not have sufficient sensors to monitor the flow of traffic within the interconnected nodes of the networks. Without early detection and making corrections, these anomalies may aggravate over time and could possibly cause disastrous outcomes in the system in the unforeseeable future. Using only coarse-grained information from the two end points of network flows, we propose a network transmission model and a localization algorithm, to detect the location of anomalies and rank them using a proposed metric within distributed systems. We evaluate our approach on passengers' records of an urbanized city's public transportation system and correlate our findings with passengers' postings on social media microblogs. Our experiments show that the metric derived using our localization algorithm gives a better ranking of anomalies a...

  20. Finite Control in Underdamped Distributed Parameter Systems

    NASA Technical Reports Server (NTRS)

    Inman, D. J.

    1985-01-01

    Specifically, a class of distributed parameter systems is defined using Hilbert space methods based on a partial differential equation model of a structure. In this space a simple, easy to check definition of underdamping is constructed based on the well known single degree of freedom concept of critical damping. It is then shown that if a given distributed parameter system satisfies this definition, each mode of the modal expansion of the solution is in fact an underdamped function of time. It is noted that a distributed parameter system which is underdamped is also uniformly exponentially stable. By appealing to the work of Gibson, a finite dimensional model of the system will yield satisfactory control laws. Furthermore, it is shown that the assumption of the underdamping also allows straightforward computation of rough bounds on the magnitude of the unmodeled or residual modes for a modal truncation scheme. Hence, underdamped systems are precisely that class of distributed parameter systems which are not likely to have spillover problems and which will yield convergence of finite dimensional control laws to control laws which are optimal for the full distributed parameter model of the system.

  1. Parallel and Distributed System Simulation

    NASA Technical Reports Server (NTRS)

    Dongarra, Jack

    1998-01-01

    This exploratory study initiated our research into the software infrastructure necessary to support the modeling and simulation techniques that are most appropriate for the Information Power Grid. Such computational power grids will use high-performance networking to connect hardware, software, instruments, databases, and people into a seamless web that supports a new generation of computation-rich problem solving environments for scientists and engineers. In this context we looked at evaluating the NetSolve software environment for network computing that leverages the potential of such systems while addressing their complexities. NetSolve's main purpose is to enable the creation of complex applications that harness the immense power of the grid, yet are simple to use and easy to deploy. NetSolve uses a modular, client-agent-server architecture to create a system that is very easy to use. Moreover, it is designed to be highly composable in that it readily permits new resources to be added by anyone willing to do so. In these respects NetSolve is to the Grid what the World Wide Web is to the Internet. But like the Web, the design that makes these wonderful features possible can also impose significant limitations on the performance and robustness of a NetSolve system. This project explored the design innovations that push the performance and robustness of the NetSolve paradigm as far as possible without sacrificing the Web-like ease of use and composability that make it so powerful.

  2. Open Source Course Management Systems: A Case Study

    ERIC Educational Resources Information Center

    Remy, Eric

    2005-01-01

    In Fall 2003, Randolph-Macon Woman's College rolled out Claroline, an Open Source course management system for all the classes on campus. This document will cover some background on both Open Source in general and course management systems in specific, discuss technical challenges in the introduction and integration of the system and give some…

  3. An Evaluation of a Distributed Learning System.

    ERIC Educational Resources Information Center

    Lawther, Peter M; Walker, Derek H. T.

    2001-01-01

    A survey of 306 undergraduate and graduate students, focus groups, and lecturers' reports evaluated a Web-enabled distributed learning system. The system was popular with students, flexible, self-paced, and empowering; technical support difficulties generated frustration. There was less interaction than desired and a lack of instant feedback and…

  4. Distribution System Reliability Assessment Incorporating Weather Effects

    Microsoft Academic Search

    R. Billinton; J. Acharya

    2006-01-01

    Electrical distribution systems usually exist in outdoor environments. The weather creates varying degrees of physical stress on system components exposed to fluctuating weather conditions. The failure rate of an element is greatly enhanced in bad weather situations and the likelihood of multiple line failures is much higher in bad weather than in normal weather. The phenomenon of coincident failures of

  5. Design considerations for distributed microsensor systems

    Microsoft Academic Search

    Anantha Chandrakasan; Rajeevain Amirtharajah; Seonghwan Cho; James Goodman; Gangadhar Konduri; Joanna Kulik; Wendi Rabiner; Alice Wang

    1999-01-01

    Wireless distributed microsensor systems will enable the reliable monitoring and control of a variety of applications that range from medical and home security to machine diagnosis, chemical\\/biological detection and other military applications. The sensors have to be designed in a highly integrated fashion, optimizing across all levels of system abstraction, with the goal of minimizing energy dissipation. This paper addresses

  6. Detection of Mutual Inconsistency in Distributed Systems

    Microsoft Academic Search

    Douglas Stott Parker Jr.; Gerald J. Popek; Gerard Rudisin; Allen Stoughton; Bruce J. Walker; Evelyn Walton; Johanna M. Chow; David A. Edwards; Stephen Kiser; Charles S. Kline

    1983-01-01

    Many distributed systems are now being developed to provide users with convenient access to data via some kind of communications network. In many cases it is desirable to keep the system functioning even when it is partitioned by network failures. A serious problem in this context is how one can support redundant copies of resources such as files (for the

  7. Elections in a Distributed Computing System

    Microsoft Academic Search

    Hector Garcia-molina

    1982-01-01

    Abstract-After afailure occurs inadistributed computing system, itisoften necessary toreorganize theactive nodes sothat they can continue toperform auseful task. Thefirst step insuch areorgani- zation orreconfiguration istoelect acoordinator nodetomanage the operation. Thispaper discusses suchelections andreorganizations. Twotypes ofreasonable failure environments arestudied. Foreach environment assertions which define themeaning ofanelection are presented. Anelection algorithm whichsatisfies theassertions is presented foreachenvironment. IndexTerms-Crash recovery, distributed computing systems,

  8. Understanding fault-tolerant distributed systems

    Microsoft Academic Search

    Flavin Cristian

    1991-01-01

    We propose a small number of basic concepts that can be used to explain thearchitecture of fault-tolerant distributed systems and we discuss a list of architecturalissues that we find useful to consider when designing or examining suchsystems. For each issue we present known solutions and design alternatives, wediscuss their relative merits and we give examples of systems which adopt oneapproach

  9. Policy Driven Management for Distributed Systems

    Microsoft Academic Search

    Morris Sloman

    1994-01-01

    Separating management policy from the automated managers which interpret the policy facilitates the dynamic change of behaviour of a distributed management system. This permits it to adapt to evolutionary changes in the system being managed and to new application requirements. Changing the behaviour of automated managers can be achieved by changing the policy without have to reimplement them - this

  10. Design Considerations for Distributed Microsensor Systems

    Microsoft Academic Search

    Anantha Chandrakasan; Rajeevan Amirtharajah; SeongHwan Cho; James Goodman; Gangadhar Konduri; Joanna Kulik; Wendi Rabiner; Alice Wang

    2000-01-01

    Wireless distributed microsensor systems will enable the reliable monitoring and control of a variety of applica- tions that range from medical and home security to machine diagnosis, chemical\\/biological detection and other military applications. The sensors have to be designed in a highly integrated fashion, optimizing across all levels of system abstraction, with the goal of minimiz- ing energy dissipation. This

  11. Applying distributed power modules in telecom systems

    Microsoft Academic Search

    Per Lindman; L. Thorsell

    1996-01-01

    The design of modern decentralized power systems in telecommunication applications are increasingly realized by using distributed DC\\/DC power modules. Power modules are usually characterized by high switching frequencies, which enable the use of small ferrite magnetics and ceramic capacitors to enhance the reliability, the power density, and the possibility of live insertion, all desired features in new power system designs.

  12. Expert System Detects Power-Distribution Faults

    NASA Technical Reports Server (NTRS)

    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.

  13. Experiences with the Amoeba distributed operating system

    Microsoft Academic Search

    Andrew S. Tanenbaum; Robbert van Renesse; Hans van Staveren; Gregory J. Sharp; Sape J. Mullender; Jack Jansen; Rossum van Guido

    1990-01-01

    The Amoeba project is a research effort aimed at understanding how to connect multiple computers in a seamless way [16, 17, 26, 27, 31]. The basic idea is to provide the users with the illusion of a single powerful timesharing system, when, in fact, the system is implemented on a collection of machines, potentially distributed among several countries. This research

  14. Measurements of a Distributed File System

    Microsoft Academic Search

    Mary G. Baker; John H. Hartman; Michael D. Kupfer; Ken W. Shirriff; John K. Ousterhout

    1991-01-01

    We analyzed the user-level file access patterns and caching behavior of the Sprite distributed file system. The first part of our analysis repeated a study done in 1985 of the: BSD UNIX file system. We found that file throughput has increased by a factor of 20 to an average of 8 Kbytes per second per active user over 10-minute intervals,

  15. Real-time distributed multimedia systems

    SciTech Connect

    Rahurkar, S.S.; Bourbakis, N.G. [Binghamton Univ., NY (United States)

    1996-12-31

    This paper presents a survey on distributed multimedia systems and discusses real-time issues. In particular, different subsystems are reviewed that impact on multimedia networking, the networking for multimedia, the networked multimedia systems, and the leading edge research and developments efforts and issues in networking.

  16. Feedwater system diagnostic development using distributed simulation

    SciTech Connect

    Walters, P.B.; Edwards, R.M.; Turso, J.A.; Garcia, H.E.

    1992-12-31

    A real-time diagnostic system for the EBR-II steam plant has been developed using the DISYS Diagnostic and Control Guidance Expert System. Diagnostic rules were developed to distinctly identify ten specific fault conditions and were tested using a real-time distributed simulation of the EBR-II steam plant. The distributed simulation is implemented in three separate programs in a VAX cluster and is coordinated through a distributed simulation manager operating in a UNIX workstation. The multi-program DISYS system currently operates in the same UNIX workstation as the simulation manager and obtains the simulated data from a shared memory segment maintained by the simulation manager. Future work includes modifying the DISYS system to improve the fault detection of rapid transients and enable it to detect gradual long term trends.

  17. Verifying Properties of Distributed Systems: Prospects for Practicality

    E-print Network

    Massachusetts at Amherst, University of

    Verifying Properties of Distributed Systems: Prospects for Practicality Lori A. Clarke Leon J. Osterweil University of Massachusetts Amherst Abstract Industry is rapidly embracing distributed systems. Although there are many advantages to distribution, such systems are certainly more difficult to understand

  18. Parametric resonance in spatially distributed systems Mihailo R. Jovanovic

    E-print Network

    Bigelow, Stephen

    Parametric resonance in spatially distributed systems Mihailo R. Jovanovi´c jmihailo consider spatially distributed systems described by Partial Differential Equations (PDEs) in which some of the coefficients are spatially periodic functions. Such systems arise in certain distributed sensorless control

  19. 46 CFR 28.855 - Electrical distribution systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Electrical distribution systems. 28.855 Section...Aleutian Trade Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a...

  20. 46 CFR 28.360 - Electrical distribution systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Electrical distribution systems. 28.360 Section...16 Individuals on Board § 28.360 Electrical distribution systems. (a) Each electrical distribution system which has a...

  1. 46 CFR 28.855 - Electrical distribution systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Electrical distribution systems. 28.855 Section...Aleutian Trade Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a...

  2. 46 CFR 28.360 - Electrical distribution systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Electrical distribution systems. 28.360 Section...16 Individuals on Board § 28.360 Electrical distribution systems. (a) Each electrical distribution system which has a...

  3. 46 CFR 28.855 - Electrical distribution systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Electrical distribution systems. 28.855 Section...Aleutian Trade Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a...

  4. 46 CFR 28.855 - Electrical distribution systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Electrical distribution systems. 28.855 Section...Aleutian Trade Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a...

  5. 43 CFR 418.27 - Distribution system operation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 2010-10-01 false Distribution system operation. 418.27 Section...Management § 418.27 Distribution system operation. (a) The...individual turnouts and operate the distribution system facilities. After...

  6. 49 CFR 192.747 - Valve maintenance: Distribution systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...false Valve maintenance: Distribution systems. 192.747 Section 192...747 Valve maintenance: Distribution systems. (a) Each valve, the...for the safe operation of a distribution system, must be checked and...

  7. 49 CFR 191.11 - Distribution system: Annual report.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Distribution system: Annual report. 191...CONDITION REPORTS § 191.11 Distribution system: Annual report. ...section, each operator of a distribution pipeline system shall submit an annual...

  8. 49 CFR 191.9 - Distribution system: Incident report.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Distribution system: Incident report. 191...CONDITION REPORTS § 191.9 Distribution system: Incident report. ...section, each operator of a distribution pipeline system shall submit...

  9. 46 CFR 28.855 - Electrical distribution systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Electrical distribution systems. 28.855 Section 28.855 Shipping...Act Vessels § 28.855 Electrical distribution systems. (a) Each electrical distribution system which has a neutral bus or...

  10. On-Site Wastewater Treatment Systems: Spray Distribution

    E-print Network

    Lesikar, Bruce J.

    1999-09-06

    A spray distribution system is very similar to a lawn irrigation system. Spray heads are used to distribute treated wastewater to the surface of the yard. This publication explains the advantages and disadvantages of spray distribution systems...

  11. 47 CFR 73.626 - DTV distributed transmission systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false DTV distributed transmission systems. 73.626 ...Broadcast Stations § 73.626 DTV distributed transmission systems. (a...section. Such operation is called a distributed transmission system (DTS)....

  12. 47 CFR 73.6023 - Distributed transmission systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Distributed transmission systems. 73.6023...Television Broadcast Stations § 73.6023 Distributed transmission systems. Station...on a common television channel in a distributed transmission system. [73 FR...

  13. 47 CFR 73.626 - DTV distributed transmission systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false DTV distributed transmission systems. 73.626 ...Broadcast Stations § 73.626 DTV distributed transmission systems. (a...section. Such operation is called a distributed transmission system (DTS)....

  14. 47 CFR 73.626 - DTV distributed transmission systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false DTV distributed transmission systems. 73.626 ...Broadcast Stations § 73.626 DTV distributed transmission systems. (a...section. Such operation is called a distributed transmission system (DTS)....

  15. 47 CFR 73.626 - DTV distributed transmission systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false DTV distributed transmission systems. 73.626 ...Broadcast Stations § 73.626 DTV distributed transmission systems. (a...section. Such operation is called a distributed transmission system (DTS)....

  16. 47 CFR 73.6023 - Distributed transmission systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Distributed transmission systems. 73.6023...Television Broadcast Stations § 73.6023 Distributed transmission systems. Station...on a common television channel in a distributed transmission system. [73 FR...

  17. 47 CFR 73.626 - DTV distributed transmission systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false DTV distributed transmission systems. 73.626 ...Broadcast Stations § 73.626 DTV distributed transmission systems. (a...section. Such operation is called a distributed transmission system (DTS)....

  18. 47 CFR 73.6023 - Distributed transmission systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Distributed transmission systems. 73.6023...Television Broadcast Stations § 73.6023 Distributed transmission systems. Station...on a common television channel in a distributed transmission system. [73 FR...

  19. Cost Modeling and Design Techniques for Integrated Package Distribution Systems

    E-print Network

    Smilowitz, Karen

    Cost Modeling and Design Techniques for Integrated Package Distribution Systems Karen R. Smilowitz and Carlos F. Daganzo December 23, 2005 Abstract Complex package distribution systems are designed using of integrated package distribution systems. Qualitative conclusions suggest that benefits of integration

  20. How open should an open system be? : essays on mobile computing

    E-print Network

    Boudreau, Kevin J. (Kevin Joseph)

    2006-01-01

    "Systems" goods-such as computers, telecom networks, and automobiles-are made up of multiple components. This dissertation comprises three essays that study the decisions of system innovators in mobile computing to "open" ...

  1. Energy optimization of water distribution system

    SciTech Connect

    Not Available

    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.

  2. Fragment distributions for highly charged systems

    Microsoft Academic Search

    C. Williams; W. G. Lynch; C. Schwarz; M. B. Tsang; W. C. Hsi; M. J. Huang; D. R. Bowman; J. Dinius; C. K. Gelbke; D. O. Handzy; G. J. Kunde; M. A. Lisa; G. F. Peaslee; L. Phair; A. Botvina; M.-C. Lemaire; S. R. Souza; G. van Buren; R. J. Charity; L. G. Sobotka; U. Lynen; J. Pochodzalla; H. Sann; W. Trautmann; D. Fox; R. T. de Souza; N. Carlin

    1997-01-01

    Charge and transverse energy distributions for intermediate mass fragments have been extracted for central 84Kr+197Au collisions at E\\/A=35-400 MeV. The slopes of the measured fragment charge distributions decrease monotonically with incident energy, consistent with the expectations for highly charged systems, but not with recent critical exponent analyses. Statistical model calculations, which reproduce the experimental trends, suggest that post-breakup fragment secondary

  3. Neutral particle beam distributed data acquisition system

    SciTech Connect

    Daly, R.T.; Kraimer, M.R.; Novick, A.H.

    1987-01-01

    A distributed data acquisition system has been designed to support experiments at the Argonne Neutral Particle Beam Accelerator. The system uses a host VAXstation II/GPX computer acting as an experimenter's station linked via Ethernet with multiple MicroVAX IIs and rtVAXs dedicated to acquiring data and controlling hardware at remote sites. This paper describes the hardware design of the system, the applications support software on the host and target computers, and the real-time performance.

  4. PHOSPHORUS IN ALUM AMENDED POULTRY LITTER SYSTEMS: DISTRIBUTION, SPECIATION, AND

    E-print Network

    Sparks, Donald L.

    PHOSPHORUS IN ALUM AMENDED POULTRY LITTER SYSTEMS: DISTRIBUTION, SPECIATION, AND INTERACTIONS;PHOSPHORUS IN ALUM AMENDED POULTRY LITTER SYSTEMS: DISTRIBUTION, SPECIATION, AND INTERACTIONS WITH ALUMINUM

  5. The Design and Implement of Open Source License Tracking System

    Microsoft Academic Search

    HongBo Xu; HuiHui Yang; Dan Wan; JiangPing Wan

    2010-01-01

    This paper describes the design and implement of a small automated license tracking system with Open Source License Checker (OSLC)-a license tracking tool, which is based on factory core services proposed in QualiPSo project. With EJB3.0 specification, GWT and SOA framework, Open Source License tracing system calls a webservice checking open license conflicting statement, and feedback the results to clients.

  6. Open information systems and data security in medicine.

    PubMed

    Blobel, B

    1996-01-01

    The realization of the German law for a new structure of health care delivery by the assurance of efficient structures and processes in hospitals calls for an optimal design of informational processes. To realize applications near to the users and just in time as well as to build up the complex functional relationships between departments and subsystems in big hospitals, a new design for Hospital Information Systems (HIS) is necessary. The features of modern HIS outlined in the paper can only be established by open systems, which guarantee portability, scalability and interoperability. This is also true in regionally distributed systems like the tumour register at Cancer Centres. In the paper the necessity and possibilities of open systems and different levels of application integration are discussed. The general statements are illustrated by practical realizations in the HIS of the Magdeburg University Hospital as well as in the tumour register at the Cancer Centre of Magdeburg/Sachsen-Anhalt. The creation of integrated structures for communications makes great demands on the assurance of data security and data protection, especially for the inclusion of external partners from the region. In the context of high sensitive data of cancer patients data protection is of top priority. The legal problems of data collection, data storage and exchange in medicine are discussed first. The paper presents some aspects of the concept for data security and data protection in the Magdeburg University HIS and of the related concept for data protection in the tumour register of the Cancer Centre Magdeburg/Sachsen-Anhalt. Appropriate steps of realization are demonstrated. The application of hardware based modern access control systems with integrated encryption of data follows. The statements are extended to the planned installation of hardware based network access control systems with integrated encryption of data in the LAN. PMID:10163732

  7. A Novel Framework for Building Distributed Data Acquisition and Monitoring Systems

    Microsoft Academic Search

    Vu Van Tan; Dae-seung Yoo; Myeong-jae Yi

    2007-01-01

    We propose a novel framework for building a distributed data acquisition and monitoring system. Our novel framework is mainly based on XML leverages and OPC (Openness, Productivity, and Connectivity) techni- ques. Correspondingly, our framework-based system allows easily aggregating more than the hundreds or thousands of the existing OPC DA (Data Access) products in use today with new OPC XML-DA products

  8. On the design of approximately optimal feedback controllers for a distributed parameter system

    Microsoft Academic Search

    A. J. Koivo; P. KRUH

    1969-01-01

    This paper presents a technique for designing an approximately optimal feedback controller in a distributed parameter system. The problem investigated is a one-dimensional heat conduction system, The controller is designed by minimizing the difference in the performance measures between the one obtained for the optimal open loop control and the one obtained for the approximately optimal feedback control. The optimal

  9. FULLY-DISTRIBUTED DEBUGGING AND VISUALIZATION OF DISTRIBUTED SYSTEMS IN ANONYMOUS NETWORKS

    E-print Network

    Paris-Sud XI, Université de

    FULLY-DISTRIBUTED DEBUGGING AND VISUALIZATION OF DISTRIBUTED SYSTEMS IN ANONYMOUS NETWORKS Keywords: Distributed algorithm, Visualization, Debugging, Anonymous network, Snapshot, Global predicate evaluation. Abstract: The debugging of distributed algorithms is a major challenge which greatly benefits from the help

  10. Cardea: Dynamic Access Control in Distributed Systems

    NASA Technical Reports Server (NTRS)

    Lepro, Rebekah

    2004-01-01

    Modern authorization systems span domains of administration, rely on many different authentication sources, and manage complex attributes as part of the authorization process. This . paper presents Cardea, a distributed system that facilitates dynamic access control, as a valuable piece of an inter-operable authorization framework. First, the authorization model employed in Cardea and its functionality goals are examined. Next, critical features of the system architecture and its handling of the authorization process are then examined. Then the S A M L and XACML standards, as incorporated into the system, are analyzed. Finally, the future directions of this project are outlined and connection points with general components of an authorization system are highlighted.

  11. An open standard for Web-based condition-based maintenance systems

    Microsoft Academic Search

    M. G. Thurston

    2001-01-01

    An effort is underway to develop an open system architecture for condition-based maintenance (CBM). The architecture development has focused on the definition of a distributed software architecture. The general requirements for a CBM software architecture are defined and an outline of the developing architecture is given. This paper will discuss in detail a web-based architecture which uses Extensible Markup Language

  12. An open-standard smart sensor architecture and system for industrial automation

    Microsoft Academic Search

    Wayne G. Baer; Richard W. Lally

    2000-01-01

    An enabling sensor technology for prognostic and health management (PHM) is the open-standard smart sensor architecture. Historically, closed or proprietary sensor buses were used to collect distributed analog sensor data to a central point for digitization. Such a system would satisfy its initial constraints, but suffer when the need for future expansion or flexibility was required. Digital sensor buses addressed

  13. An open absorption system installed at a sawmill

    Microsoft Academic Search

    L Johansson; L Westerlund

    2000-01-01

    This work describes a pilot plant and its different parts in a system used for bio-fuel drying and timber drying with an open absorption process. This technique has not been used previously in Sweden in this application. The open absorption system has been installed on four timber dryers and one bio-fuel dryer at a sawmill located in the northern part

  14. Democracy in Open Agent Systems Peter McBurney

    E-print Network

    Parsons, Simon

    Democracy in Open Agent Systems Peter McBurney Department of Computer Science University Languages, Deliberative Democracy, Open Agent Systems, Political Philosophy, Philosophical Foundations the participants is closer to one of equality; this in turn suggests that some form of democracy is appropriate

  15. Skeletal anchorage system for open-bite correction

    Microsoft Academic Search

    Mikako Umemori; Junji Sugawara; Hideo Mitani; Hiroshi Nagasaka; Hiroshi Kawamura

    1999-01-01

    A skeletal anchorage system was developed for tooth movements. It consists of a titanium miniplate that is temporarily implanted in the maxilla or the mandible as an immobile anchorage. In this article, we introduce the skeletal anchorage system to intrude the lower molars in open-bite malocclusion and evaluate the results of treatment in two severe open-bite cases that underwent orthodontic

  16. Heat and liquid recovery using open cycle heat pump system

    Microsoft Academic Search

    Fox

    1985-01-01

    The present invention relates to the recovery of heat and\\/or condensable liquid from a gaseous environment utilizing an open cycle heat pump system. The open cycle heat pump system is employed to alter the temperature of a gas by compression, expansion, heat exchange, and combinations thereof, to condense selected vapors carried in the gaseous environment for removal from the gas.

  17. Heat and liquid recovery using open cycle heat pump system

    Microsoft Academic Search

    Fox

    1981-01-01

    The present invention relates to the recovery of heat and\\/or condensable liquid from a gaseous environment utilizing an open cycle heat pump system. The open cycle heat pump system is employed to alter the temperature of a gas by compression, expansion, heat exchange, and combinations thereof, to condense selected vapors carried in the gaseous environment for removal from the gas.

  18. LVT: A Layered Verification Technique for Distributed Computing Systems

    E-print Network

    Olsson, Ron

    LVT: A Layered Verification Technique for Distributed Computing Systems Cui Zhang ? , Brian R of distributed computing systems with multiple component layers. Each lower layer in such a system provides languages as interfaces of systems, LVT treats each layer in a distributed computing system as a distributed

  19. Empowering open systems through cross-platform interoperability

    NASA Astrophysics Data System (ADS)

    Lyke, James C.

    2014-06-01

    Most of the motivations for open systems lie in the expectation of interoperability, sometimes referred to as "plug-and-play". Nothing in the notion of "open-ness", however, guarantees this outcome, which makes the increased interest in open architecture more perplexing. In this paper, we explore certain themes of open architecture. We introduce the concept of "windows of interoperability", which can be used to align disparate portions of architecture. Such "windows of interoperability", which concentrate on a reduced set of protocol and interface features, might achieve many of the broader purposes assigned as benefits in open architecture. Since it is possible to engineer proprietary systems that interoperate effectively, this nuanced definition of interoperability may in fact be a more important concept to understand and nurture for effective systems engineering and maintenance.

  20. Importance of Hydrogeological Conditions on Open-loop Geothermal System

    NASA Astrophysics Data System (ADS)

    Park, D.; Bae, G.; Kim, S.; Lee, K.

    2013-12-01

    The open-loop geothermal system has been known as an eco-friendly, energy-saving, and cost-efficient alternative for the cooling and heating of buildings with directly using the relatively stable temperature of groundwater. Thus, hydrogeological properties of aquifer, such as hydraulic conductivity and storage, must be important in the system application. The study site is located near Han-river, Korea, and because of the well-developed alluvium it might be a typical site appropriate to this system requiring an amount of groundwater. In this study, the first objective of numerical experiments was to find the best distributions of pumping and injection wells suitable to the hydrogeological conditions of the site for the efficient and sustainable system operation. The aquifer has a gravel layer at 15m depth below the ground surface and the river and the agricultural field, which may be a potential contaminant source, are located at the west and east sides, respectively. Under the general conditions that the regional groundwater flows from the east to the river, the locally reversed well distribution, locating the pumping well at upgradient and the injection well at downgradient of the regional flow, was most sustainable. The gravel layer with high hydraulic conductivity caused a little drawdown despite of an amount of pumping and allowed to stably reinject the used groundwater in all the cases, but it provided a passage transferring the injected heat to the pumping well quickly, particularly in the cases locating the injection well at the upgradient. This thermal interference was more severe in the cases of the short distance between the wells. The high conductive layer is also a reason that the seasonal role conversion of wells for the aquifer thermal energy storage was ineffective in this site. Furthermore, the well distribution vertical to the regional groundwater flow was stable, but not best, and, thus, it may be a good choice in the conditions that the regional groundwater flow direction has often been changed. Any effects of the seasonal river temperature variation and contaminant sources were not found on the wells because of the well screen installed at only the relatively deep gravel layer. Finally, it was evaluated whether if these results are valid in a homogeneous aquifer with the full screen of wells and the aquifer having a sediment layer with high hydraulic conductivity at a shallow depth, which are also typical aquifers near river. All the results concluded that it is essential to investigate and understand the site-specific hydrogeological conditions for the successful application of open-loop geothermal system.

  1. A Cooperative Distributed Problem-Solving Management Framework for Office Automation Systems

    Microsoft Academic Search

    Feng-Chao Yang; Yu-Kuen Ho

    1997-01-01

    The successful design of cost-effective development and executive environments for Office Automation (OA) depends chiefly on infor mation accessibility and flexible open system architecture A groupware management mechanism—Cooperative Distributed Problem-Solving Management Framework (CDPSMF) and its application to Office Automation System (OAS) design are given Recurrent group structure is used to characterize an enterprise or organization Management framework, using the Distributed

  2. Fine-Scale Distribution and Spatial Variability of Benthic Invertebrate Larvae in an Open Coastal Embayment in

    E-print Network

    deYoung, Brad

    Fine-Scale Distribution and Spatial Variability of Benthic Invertebrate Larvae in an Open Coastal- scale (0.5 km) of variability in the horizontal distributions of benthic invertebrate larvae and related (2014) Fine-Scale Distribution and Spatial Variability of Benthic Invertebrate Larvae in an Open Coastal

  3. Report from Dagstuhl Seminar 13081 Consistency in Distributed Systems

    E-print Network

    Paris-Sud XI, Université de

    Report from Dagstuhl Seminar 13081 Consistency in Distributed Systems Edited by Bettina Kemme1 of Dagstuhl Seminar 13081 "Consistency in Distributed Systems." Seminar 18.­22. February, 2013 ­ www.4 Distributed Systems ­ Distributed databases, D.4.2 Storage Management ­ Distributed memories, E.1 Data

  4. Systems coordinating distributed collaborative work must manage user data distributed over a network. The strong con-

    E-print Network

    Dourish,Paul

    1 Abstract Systems coordinating distributed collaborative work must manage user data distributed the distributed systems community are often unsuited to the particular needs of CSCW. Here, I outline computing systems (or just "dis- tributed systems"), concerning the distributed management of data

  5. Zeno dynamics in quantum open systems

    PubMed Central

    Zhang, Yu-Ran; Fan, Heng

    2015-01-01

    Quantum Zeno effect shows that frequent observations can slow down or even stop the unitary time evolution of an unstable quantum system. This effect can also be regarded as a physical consequence of the statistical indistinguishability of neighboring quantum states. The accessibility of quantum Zeno dynamics under unitary time evolution can be quantitatively estimated by quantum Zeno time in terms of Fisher information. In this work, we investigate the accessibility of quantum Zeno dynamics in quantum open systems by calculating noisy Fisher information when a trace preserving and completely positive map is assumed. We firstly study the consequences of non-Markovian noise on quantum Zeno effect and give the exact forms of the dissipative Fisher information and the quantum Zeno time. Then, for the operator-sum representation, an achievable upper bound of the quantum Zeno time is given with the help of the results in noisy quantum metrology. It is of significance that the noise reducing the accuracy in the entanglement-enhanced parameter estimation can conversely be favorable for the accessibility of quantum Zeno dynamics of entangled states. PMID:26099840

  6. Orientation in Systems with Asymmetric Density Distribution

    PubMed Central

    Sluka, S. J.; Smith, A. H.; Besch, E. L.

    1966-01-01

    The hen's egg is a convenient and suitable model for biological systems in which mass is asymmetrically distributed. Under the influence of an acceleration field (such as provided by gravity on earth), such systems will become oriented, and this may have biological significance. However, depending upon the viscous and elastic properties of the system, some minimal force, i.e. a threshold, will be necessary for movement in the system. This threshold, and the restraining properties of the yolk-albumen boundary, have been evaluated for the hen's egg and are reported herein. ImagesFigure 3Figure 4 PMID:6006449

  7. Deceit: A flexible distributed file system

    NASA Technical Reports Server (NTRS)

    Siegel, Alex; Birman, Kenneth; Marzullo, Keith

    1989-01-01

    Deceit, a distributed file system (DFS) being developed at Cornell, focuses on flexible file semantics in relation to efficiency, scalability, and reliability. Deceit servers are interchangeable and collectively provide the illusion of a single, large server machine to any clients of the Deceit service. Non-volatile replicas of each file are stored on a subset of the file servers. The user is able to set parameters on a file to achieve different levels of availability, performance, and one-copy serializability. Deceit also supports a file version control mechanism. In contrast with many recent DFS efforts, Deceit can behave like a plain Sun Network File System (NFS) server and can be used by any NFS client without modifying any client software. The current Deceit prototype uses the ISIS Distributed Programming Environment for all communication and process group management, an approach that reduces system complexity and increases system robustness.

  8. Distributed intrusion detection system based on ARTIS

    NASA Astrophysics Data System (ADS)

    Qiao, Peili; Su, Jie; Sun, Chengwei

    2005-03-01

    Traditional IDS (Intrusion Detection System) performs detection by matching the sample pattern with the intrusion pattern that has been defined, as a result the IDS loses the diversity and the self-adaptation and can not detect the variation intrusion and the unknown intrusion. This paper gives a distributed intrusion detection approach based on the Artificial Immune System. It defines the Self, Nonself and immune cell and builds an intrusion detection model composed of memory cell, mature cell and immature cell and also gives the environment definition, matching rule, training detection system, immune regulation and memory, monitor generation and so on. The result of the experiment show that this intrusion detection system model has the characters of distributed, error tolerance, dynamic learning, adaptation and this approach is efficient to the network intrusion detection.

  9. Providing Spatial Integrity for Distributed Unmanned Systems

    Microsoft Academic Search

    Peter Simon Sapaty

    2009-01-01

    \\u000a Due to the increased complexity of tasks delegated to unmanned systems their collective use is becoming of paramount importance\\u000a for performing any reasonable jobs. An approach is offered where integral group behaviors are achieved automatically rather\\u000a than set up manually. Missions in a high-level Distributed Scenario Language can be executed jointly by communicating interpreters\\u000a embedded in key system units. Robotic

  10. Distributed-aperture infrared sensor systems

    Microsoft Academic Search

    Thomas C. Brusgard

    1999-01-01

    The on-going maturation of electro-optic technology in which the advent of third generation focal plane array is being combined with the capabilities of increasingly powerful signal processing algorithm now points to a new direction in design of electro-optic sensor system for both military and non-military applications. Taking advantage of those advances. Distributed Aperture IR Sensor systems (DAIRS) are currently in

  11. STANDARDIZED COST FOR WATER SUPPLY DISTRIBUTION SYSTEMS

    EPA Science Inventory

    There are a significant number of water supply distribution systems in the United States that are deteriorating, resulting in a potential threat to the future quality of drinking water. orrective measures will directly influence the cost of providing water. t would be useful to h...

  12. Frangipani: A Scalable Distributed File System

    Microsoft Academic Search

    Chandramohan A. Thekkath; Timothy Mann; Edward K. Lee

    1997-01-01

    The ideal distributed file system would provide all its users with co- herent, shared access to the same set of files,yet would be arbitrarily scalable to provide more storage space and higher performance to a growing user community. It would be highly available in spite of component failures. It would require minimal human administra- tion, and administration would not become

  13. 1 Distributed File Systems ffl Network transparency

    E-print Network

    Plotkin, Joshua B.

    , files and directories -- cache manager -- to reduce network delay, disk delay problem: inconsistency ffl1 Distributed File Systems 1.1 Goals ffl Network transparency users do not have to aware performance) -- clients -- machines used for computational activities may have a local disk for caching remote

  14. METALS DISTRIBUTIONS IN ACTIVATED SLUDGE SYSTEMS

    EPA Science Inventory

    This project developed models to predict the distribution of metals in activated sludge system process streams. The data used to develop the models were obtained through extended pilot studies from a previous project. The objectives of the study were to evaluate the effects of wa...

  15. Biofilm accumulation in drinking water distribution systems

    Microsoft Academic Search

    J. C. Block; K. Haudidier; J. L. Paquin; J. Miazga; Y. Levi

    1993-01-01

    In order to classify the relative importance of the parameters governing the accumulation of biofilm in drinking water distribution systems, a study has been carried out, using an industrial pilot plant fed with finished waters, with three main objectives, viz. (i) determination of biofilm density on pipe surfaces (PVC or cement lined cast iron) as a function of the distance

  16. Ray tracing on distributed memory parallel systems

    NASA Technical Reports Server (NTRS)

    Jensen, David W.; Reed, Daniel A.

    1990-01-01

    Among the many techniques in computer graphics, ray tracing is prized because it can render realistic images, albeit at great computational expense. In this note, the performance of several approaches to ray tracing on a distributed memory parallel system is evaluated. A set of performance instrumentation tools and their associated visualization software are used to identify the underlying causes of performance differences.

  17. Distributed Monitoring of Concurrent and Asynchronous Systems

    Microsoft Academic Search

    Eric Fabre; Albert Benveniste; Stefan Haar; Claude Jard

    2005-01-01

    In this paper we study the diagnosis of distributed asynchronous sys- tems with concurrency. Diagnosis is performed by a peer-to-peer dis- tributed architecture of supervisors. Our approach relies on Petri net unfoldings and event structures, as means to manipulate trajectories of systems with concurrency. This article is an extended version of the paper with same title, which appeared as a

  18. Distributed Neural Systems for Face Perception

    E-print Network

    Bucci, David J.

    Chapter 6 Distributed Neural Systems for Face Perception James V. Haxby and Maria Ida Gobbini Introduction Face perception plays a central role in social communication and is, arguably, one of the most sophisticated visual perceptual skills in humans. Consequently, face perception has been the sub- ject

  19. Quality monitoring in clock synchronized distributed systems

    Microsoft Academic Search

    Georg Gaderer; Patrick Loschmidt; Thilo Sauter

    2006-01-01

    Clock synchronization in distributed computer systems is an enabler for the introduction of real-time. So far, many approaches are published which implement clock synchronization on a protocol basis over state of the art packet oriented networks. One very recent example is the introduction of real-time into industrial Ethernet net- works, like in Profinet or Powerlink. In addition to this usually

  20. COST FOR WATER SUPPLY DISTRIBUTION SYSTEM REHABILITATION

    EPA Science Inventory

    A major challenge for the society in the twenty-first century will be design, rehabilitation, replacement, and optimal management of drinking water distribution systems. A recent survey conducted by the USEPA found that $138B will be needed to maintain and replace existing drinki...

  1. 14 CFR 23.1445 - Oxygen distribution system.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 false Oxygen distribution system. 23.1445 Section...Equipment § 23.1445 Oxygen distribution system. (a) Except... (b) Nonmetallic oxygen distribution lines must not be routed...be subjected to elevated temperatures, electrical arcing,...

  2. Part III: AFS - A Secure Distributed File System

    SciTech Connect

    Wachsmann, A.; /SLAC

    2005-06-29

    AFS is a secure distributed global file system providing location independence, scalability and transparent migration capabilities for data. AFS works across a multitude of Unix and non-Unix operating systems and is used at many large sites in production for many years. AFS still provides unique features that are not available with other distributed file systems even though AFS is almost 20 years old. This age might make it less appealing to some but with IBM making AFS available as open-source in 2000, new interest in use and development was sparked. When talking about AFS, people often mention other file systems as potential alternatives. Coda (http://www.coda.cs.cmu.edu/) with its disconnected mode will always be a research project and never have production quality. Intermezzo (http://www.inter-mezzo.org/) is now in the Linux kernel but not available for any other operating systems. NFSv4 (http://www.nfsv4.org/) which picked up many ideas from AFS and Coda is not mature enough yet to be used in serious production mode. This article presents the rich features of AFS and invites readers to play with it.

  3. Data distribution satellite system architecture concept

    NASA Technical Reports Server (NTRS)

    Price, Kent M.; Jorasch, Ronald E.

    1990-01-01

    This paper describes a future communications satellite system architecture concept called the Data Distribution Satellite (DDS). The DDS is envisioned as a new system to be used as an adjunct to TDRS/TDAS for distributing new NASA science data throughout the U.S. as well as internationally. The DDS would also provide networking capability for interchange of science database files among science users and NASA archive depositories. Experimenters would be able to access and control their experimental packages remotely, relieving astronaut workload. This paper gives a conceptual system design based on year 1995 technology. Features of the design include use of Ku and Ka-bands, use of fixed spot beams, 2 Gb/s throughput, and on-board demodulation and switching. The satellite dry mass is 1,300 kg and end-of-life power is 4 kW.

  4. Stabilized fiber-optic frequency distribution system

    NASA Technical Reports Server (NTRS)

    Primas, L. E.; Lutes, G. F.; Sydnor, R. L.

    1989-01-01

    A technique for stabilizing reference frequencies transmitted over fiber-optic cable in a frequency distribution system is discussed. The distribution system utilizes fiber-optic cable as the transmission medium to distribute precise reference signals from a frequency standard to remote users. The stability goal of the distribution system is to transmit a 100-MHz signal over a 22-km fiber-optic cable and maintain a stability of 1 part in 10(17) for 1000-second averaging times. Active stabilization of the link is required to reduce phase variations produced by environmental effects, and is achieved by transmitting the reference signal from the frequency standard to the remote unit and then reflecting back to the reference unit over the same optical fiber. By comparing the phase of the transmitted and reflected signals at the reference unit, phase variations of the remote signal can be measured. An error voltage derived from the phase difference between the two signals is used to add correction phase.

  5. Laser spark distribution and ignition system

    DOEpatents

    Woodruff, Steven (Morgantown, WV); McIntyre, Dustin L. (Morgantown, WV)

    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.

  6. Derived virtual devices: a secure distributed file system mechanism

    NASA Technical Reports Server (NTRS)

    VanMeter, Rodney; Hotz, Steve; Finn, Gregory

    1996-01-01

    This paper presents the design of derived virtual devices (DVDs). DVDs are the mechanism used by the Netstation Project to provide secure shared access to network-attached peripherals distributed in an untrusted network environment. DVDs improve Input/Output efficiency by allowing user processes to perform I/O operations directly from devices without intermediate transfer through the controlling operating system kernel. The security enforced at the device through the DVD mechanism includes resource boundary checking, user authentication, and restricted operations, e.g., read-only access. To illustrate the application of DVDs, we present the interactions between a network-attached disk and a file system designed to exploit the DVD abstraction. We further discuss third-party transfer as a mechanism intended to provide for efficient data transfer in a typical NAP environment. We show how DVDs facilitate third-party transfer, and provide the security required in a more open network environment.

  7. Web services for distributed and interoperable hydro-information systems

    NASA Astrophysics Data System (ADS)

    Horak, J.; Orlik, A.; Stromsky, J.

    2008-03-01

    Web services support the integration and interoperability of Web-based applications and enable machine-to-machine interaction. The concepts of web services and open distributed architecture were applied to the development of T-DSS, the prototype customised for web based hydro-information systems. T-DSS provides mapping services, database related services and access to remote components, with special emphasis placed on the output flexibility (e.g. multilingualism), where SOAP web services are mainly used for communication. The remote components are represented above all by remote data and mapping services (e.g. meteorological predictions), modelling and analytical systems (currently HEC-HMS, MODFLOW and additional utilities), which support decision making in water management.

  8. Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal Distribution Systems

    E-print Network

    Distribution Systems Walker, I., Sherman, M., and Siegel, J. Environmental Energy Technologies Division Energy1 LBNL-43724 Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal....................................................................................... 7 3. DUCT SYSTEM INTERACTIONS WITH SYSTEM SIZING

  9. Equilibriumlike fluctuations in some boundary-driven open diffusive systems.

    PubMed

    Imparato, A; Lecomte, V; van Wijland, F

    2009-07-01

    There exist some boundary-driven open systems with diffusive dynamics whose particle current fluctuations exhibit universal features that belong to the Edwards-Wilkinson universality class. We achieve this result by establishing a mapping, for the system fluctuations, to an equivalent open yet equilibrium-diffusive system. We discuss the possibility of observing dynamic phase transitions using the particle current as a control parameter. PMID:19658677

  10. RESEARCH Open Access Spatial and temporal distribution patterns of

    E-print Network

    Boyer, Edmond

    larval habitat availability and suitable conditions under which they can thrive. Here, we investigated the impact of environmental factors on the temporal and spatial distribution of larval habitats of Anopheles archival data which provided the complete enumeration of An. arabiensis breeding habitats in three distinct

  11. The diagnostic study of optical tomography for high-temperature flow fields in the open system

    NASA Astrophysics Data System (ADS)

    Chen, Yun-yun; Huang, Xiao-gu; Wen, Yan; Guo, Zhen-yan; Song, Yang

    2015-06-01

    In this paper, the application of moiré and emission tomography in diagnosing the high-temperature and illuminant flow field in the open system is studied, and two flames with different spatial size are chosen as typical objects. First of all, the moiré fringes and the corresponding measured two flames are obtained by integrating moiré and emission tomography. After that, the distribution and the brightness of the moiré fringes are compared for the two flame flow fields, as well as the distributions of the refractive index and the components. Then, the temperature distributions of the two flames are compared and analyzed. The results show that, when moiré and emission tomography are applied in diagnosing the high-temperature and illuminant flow field in the open system, the size, the structure and the species components of the measured flow fields have important effect on the final temperature results. Consequently, the specific problem should be specifically analyzed for the optical diagnosis of flow fields.

  12. Democracy in Open Agent Systems Peter McBurney

    E-print Network

    Atkinson, Katie

    Democracy in Open Agent Systems Peter McBurney Department of Computer Science University@sci.brooklyn.cuny.edu ABSTRACT What sort of democracies are open agent societies? We present three normative models of democracy as wise rule by an elite; democracy as the exercise of ra­ tional consumer choices by voters

  13. Leveraging Open Source solutions for secure government systems

    Microsoft Academic Search

    Michael Worden

    2006-01-01

    Recent updates to federal government and Department of Defense (DoD) security policies have opened the door to the official use of Open Source Software (OSS) as a solution set for the development of secure enterprise systems. New policies published by the National Institute of Standards and Technology (NIST) and the DoD have significantly changed the guidelines associated with deployment of

  14. Control of the quantum open system via quantum generalized measurement

    SciTech Connect

    Zhang Ming; Zhu Xiaocai; Li Xingwei; Hu Dewen [College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan 410073 (China); Dai Hongyi [College of Science, National University of Defense Technology, Changsha, Hunan 410073 (China)

    2006-03-15

    For any specified pure state of quantum open system, we can construct a kind of quantum generalized measurement (QGM) that the state of the system after measurement will be deterministically collapsed into the specified pure state from any initial state. In other words, any pure state of quantum open system is reachable by QGM. Subsequently, whether the qubit is density matrix controllable is discussed in the case of pure dephasing. Our results reveal that combining QGM with coherent control will enhance the ability of controlling the quantum open system. Furthermore, it is found that the ability to perform QGM on the quantum open system, combined with the ability of coherence control and conditions of decoherence-free subspace, allows us to suppress quantum decoherence.

  15. Open Giant Intelligent Information Systems and Its Multiagent-Oriented System Design

    E-print Network

    Cao, Longbing

    Open Giant Intelligent Information Systems and Its Multiagent-Oriented System Design Longbing Cao}@it.uts.edu.au, ruwei.dai@mail.ia.ac.cn Abstract Open giant intelligent information system has been studied as a new field of complex intelligent information systems. In this paper, we mainly discuss about system design

  16. System level concurrency control for distributed database systems

    Microsoft Academic Search

    Daniel J. Rosenkrantz; Richard Edwin Stearns; Philip M. Lewis II

    1978-01-01

    A distributed database system is one in which the database is spread among several sites and application programs “move” from site to site to access and update the data they need. The concurrency control is that portion of the system that responds to the read and write requests of the application programs. Its job is to maintain the global consistency

  17. Universal machine control system primitives for modular distributed manipulator systems

    Microsoft Academic Search

    R. H. WESTON; R. HARRISON; A. H. BOOTH; P. R. MOORE

    1989-01-01

    The market for programmable machines is still in its infancy, awaiting major changes in machine architectures and functionality. This paper anticipates the evolution of modular distributed manipulator systems and outlines their potential role as generic reconfigurable manufacturing machines. The necessary functionality of the control and mechanical primitive elements of such systems will be described with reference to major SERC-funded research

  18. Automated distribution system management for multichannel space power systems

    NASA Technical Reports Server (NTRS)

    Fleck, G. W.; Decker, D. K.; Graves, J.

    1983-01-01

    A NASA sponsored study of space power distribution system technology is in progress to develop an autonomously managed power system (AMPS) for large space power platforms. The multichannel, multikilowatt, utility-type power subsystem proposed presents new survivability requirements and increased subsystem complexity. The computer controls under development for the power management system must optimize the power subsystem performance and minimize the life cycle cost of the platform. A distribution system management philosophy has been formulated which incorporates these constraints. Its implementation using a TI9900 microprocessor and FORTH as the programming language is presented. The approach offers a novel solution to the perplexing problem of determining the optimal combination of loads which should be connected to each power channel for a versatile electrical distribution concept.

  19. A system for distributed intrusion detection

    SciTech Connect

    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.

  20. Open issues with the gamma-ray burst redshift distribution

    E-print Network

    David Coward

    2007-02-27

    Cosmological gamma ray bursts (GRBs) are the brightest explosions in the Universe. Satellite detectors, such as Beppo-SAX, HETE2 and more recently Swift, have provided a wealth of data, including the localization and redshifts of subsets of GRBs. The redshift distribution has been utilized in several studies in attempts to constrain the evolving star formation rate and to probe GRB rate evolution in the high-redshift Universe. These studies find that the GRB luminosity function and/or the rate density evolve with redshift. We present a short review of the problems of constraining GRB rate evolution in the context of the complex mix of biases inherent in the redshift measurements. To disentangle GRB rate evolution from the biases prevalent in the redshift distribution will require accounting for the incompleteness of the observed redshift sample. We highlight the importance of formulating a `complete GRB selection function' to account for the main sources of bias.

  1. Minotor: Monitoring Timing and Behavioral Properties for Dependable Distributed Systems

    E-print Network

    Paris-Sud XI, Université de

    Minotor: Monitoring Timing and Behavioral Properties for Dependable Distributed Systems Olivier, in distributed and time-constrained systems. Based on a description of a property that includes events-case. Keywords-Distributed Systems; Time-constrained Systems; Online Monitoring; Fault-tolerant Systems; Petri

  2. Tools for Continuously Evaluating Distributed System Qualities James H. Hill

    E-print Network

    Schmidt, Douglas C.

    , and security) for distributed systems has historically occurred late in the software lifecycle. As a result with system execution modeling tools--can enable agile development of distributed systems and facili- tate the software lifecycle. Keywords. agile techniques, continuous system inte- gration, distributed systems

  3. Power Distribution System Planning with GIS Consideration

    NASA Astrophysics Data System (ADS)

    Wattanasophon, Sirichai; Eua-Arporn, Bundhit

    This paper proposes a method for solving radial distribution system planning problems taking into account geographical information. The proposed method can automatically determine appropriate location and size of a substation, routing of feeders, and sizes of conductors while satisfying all constraints, i.e. technical constraints (voltage drop and thermal limit) and geographical constraints (obstacle, existing infrastructure, and high-cost passages). Sequential quadratic programming (SQP) and minimum path algorithm (MPA) are applied to solve the planning problem based on net price value (NPV) consideration. In addition this method integrates planner's experience and optimization process to achieve an appropriate practical solution. The proposed method has been tested with an actual distribution system, from which the results indicate that it can provide satisfactory plans.

  4. Toward an Intelligent Distributed Safety Instrumented Systems: Dependability Evaluation

    E-print Network

    Paris-Sud XI, Université de

    Toward an Intelligent Distributed Safety Instrumented Systems: Dependability Evaluation Abdelhak Systems (SIS) in order to determine the contribution of the intelligent instruments in the safety for the evaluation of the dependability of the Intelligent Distributed Safety Instrumented Systems (IDSIS) refer

  5. On-Site Wastewater Treatment Systems: Subsurface Drip Distribution

    E-print Network

    Lesikar, Bruce J.

    1999-09-06

    A subsurface drip system distributes wastewater to the lawn through a system of tubing installed below the ground. This publication explains the advantages and disadvantages of subsurface drip distribution systems, as well as estimated costs...

  6. On-Site Wastewater Treatment Systems: Spray Distribution (Spanish)

    E-print Network

    Lesikar, Bruce J.; Enciso, Juan

    1999-08-12

    Spray distribution systems for wastewater treated on site are much like lawn irrigation systems. This publication explains the advantages, disadvantages, maintenance steps and estimated costs of spray distribution systems....

  7. On-Site Wastewater Treatment Systems: Subsurface Drip Distribution 

    E-print Network

    Lesikar, Bruce J.

    1999-09-06

    A subsurface drip system distributes wastewater to the lawn through a system of tubing installed below the ground. This publication explains the advantages and disadvantages of subsurface drip distribution systems, as well ...

  8. On-Site Wastewater Treatment Systems: Spray Distribution (Spanish) 

    E-print Network

    Lesikar, Bruce J.; Enciso, Juan

    1999-08-12

    Spray distribution systems for wastewater treated on site are much like lawn irrigation systems. This publication explains the advantages, disadvantages, maintenance steps and estimated costs of spray distribution systems.

  9. Modular Visualization of Distributed Systems Gustavo A. Guevara S.1

    E-print Network

    Varela, Carlos

    Modular Visualization of Distributed Systems Gustavo A. Guevara S.1 Jason LaPorte2 Carlos A. Varela to developing, analyzing, and optimizing distributed systems. We have developed OverView, a tool for online/offline distributed systems visualization, that enables modular layout mechanisms, so that different distributed

  10. Odorant loss in natural gas distribution systems

    SciTech Connect

    Moran, E.A.; Pai, P.G.; Carducci, M.I. (Lab. Services, Dept. of Engineering Activity, Michigan Consolidated Gas Co., MI (US))

    1991-04-01

    The loss of odorant compounds (odor fading) was studied using flow reactors which simulated the typical operating conditions of a gas distribution system. A unique method was developed to simulate rust on the inside surface of the pipeline. The study indicated that odorant loss can be impacted by the following operating parameters: Pressure; Temperature; Velocity; Iron oxide compounds; Thickness of iron oxide layer in pipe.

  11. Electric power distribution and load transfer system

    NASA Technical Reports Server (NTRS)

    Bradford, Michael P. (Inventor); Parkinson, Gerald W. (Inventor); Grant, Ross M. (Inventor)

    1989-01-01

    A power distribution system includes a plurality of power sources and load transfer units including transistors and diodes connected in series and leading to a common power output, each of the transistors being controller switchable subject to voltage levels of the respective input and output sides of said transistors, and the voltage and current level of said common power output. The system is part of an interconnection scheme in which all but one of the power sources is connected to a single load transfer unit, enabling the survival of at least a single power source with the failure of one of the load transfer units.

  12. Neutron chain length distributions in subcritical systems

    SciTech Connect

    Nolen, S.D.; Spriggs, G.

    1999-09-27

    In this paper, the authors present the results of the chain-length distribution as a function of k in subcritical systems. These results were obtained from a point Monte Carlo code and a three-dimensional Monte Carlo code, MC++. Based on these results, they then attempt to explain why several of the common neutron noise techniques, such as the Rossi-{alpha} and Feynman's variance-to-mean techniques, are difficult to perform in highly subcritical systems using low-efficiency detectors.

  13. Electric power distribution and load transfer system

    NASA Technical Reports Server (NTRS)

    Bradford, Michael P. (Inventor); Parkinson, Gerald W. (Inventor); Grant, Ross M. (Inventor)

    1987-01-01

    A power distribution system includes a plurality of power sources and load transfer units including transistors and diodes connected in series and leading to a common power output, each of the transistors being controller switchable subject to voltage levels of the respective input and output sides of said transistors, and the voltage and current level of said common power output. The system is part of an interconnection scheme in which all but one of the power sources is connected to a single load transfer unit, enabling the survival of at least a single power source with the failure of one of the load transfer units.

  14. Petri net controllers for distributed robotic systems

    NASA Astrophysics Data System (ADS)

    Lefebvre, D. R.; Saridis, George N.

    1992-09-01

    Petri nets are a well established modelling technique for analyzing parallel systems. When coupled with an event-driven operating system, Petri nets can provide an effective means for integrating and controlling the functions of distributed robotic applications. Recent work has shown that Petri net graphs can also serve as remarkably intuitive operator interfaces. In this paper, the advantages of using Petri nets as high-level controllers to coordinate robotic functions are outlined, the considerations for designing Petri net controllers are discussed, and simple Petri net structures for implementing an interface for operator supervision are presented. A detailed example is presented which illustrates these concepts for a sensor-based assembly application.

  15. Distribution system planning using knowledge based expert system

    SciTech Connect

    Ranjan, R.; Das, D. [Birla Inst. of Tech. and Science, Rajasthan (India). Electrical and Electronics Engineering Dept.; Kothari, D.P. [Indian Inst. of Tech., New Delhi (India). Centre for Energy Studies

    1995-12-31

    In this paper an attempt is made to develop a new algorithm for distribution system planning. Generalized algorithm is developed for obtaining the optimal feeder path and optimal location of substation based on minimum loss criteria. The proposed method can handle all the heuristic rules. Also presented are a new load flow algorithm for solving radial distribution feeders and a branch conductor optimization algorithm. The load flow and branch conductor optimization techniques are used as subroutine in the generalized distribution planning algorithm. Several problems have been successfully tested using the proposed algorithm and results are highly satisfactory.

  16. An Energy-Efficient Slack Distribution Technique for Multimode Distributed Real-Time Embedded Systems

    Microsoft Academic Search

    Rabi N. Mahapatra; Wei Zhao

    2005-01-01

    In multimode distributed systems, active task sets are assigned to their distributed components for realizing one or more functions. Many of these systems encounter runtime task variations at the input and across the system while processing their tasks in real time. Very few efforts have been made to address energy efficient scheduling in these types of distributed systems. In this

  17. Conserved current in Markovian open-quantum systems

    SciTech Connect

    Bodor, Andras; Diosi, Lajos [Department of the Physics of Complex Systems, Eoetvoes University, H-1117 Budapest (Hungary); Research Institute for Particle and Nuclear Physics, H-1525 Budapest 114, P.O. Box 49 (Hungary)

    2006-06-15

    We reexamine the Markovian approximation of local current in open quantum systems, discussed recently by Gebauer and Car. Our derivation is more transparent; the proof of the current conservation becomes explicit and easy.

  18. Smart Operations in Distributed Energy Resources System

    NASA Astrophysics Data System (ADS)

    Wei, Li; Jie, Shu; Zhang-XianYong; Qing, Zhou

    Smart grid capabilities are being proposed to help solve the challenges concerning system operations due to that the trade-offs between energy and environmental needs will be constantly negotiated while a reliable supply of electricity needs even greater assurance in case of that threats of disruption have risen. This paper mainly explores models for distributed energy resources system (DG, storage, and load),and also reviews the evolving nature of electricity markets to deal with this complexity and a change of emphasis on signals from these markets to affect power system control. Smart grid capabilities will also impact reliable operations, while cyber security issues must be solved as a culture change that influences all system design, implementation, and maintenance. Lastly, the paper explores significant questions for further research and the need for a simulation environment that supports such investigation and informs deployments to mitigate operational issues as they arise.

  19. Managing ACLs on an OpenLDAP-based Distributed Directory Service

    Microsoft Academic Search

    Raissa Medeiros; Giovanni Santos; Fernando Cruz; Marcos Rocha; Rogério Santos

    This paper describes the ARPA (ACL Replication and Propagation Algorithm) as a solution to propagate and replicate ACLs automatically in an OpenLDAP-based directory service. It is particularly useful in a distributed environment where an ACL should be configured on several servers to give user rights over some objects. Additionally, if a server has got its replicas, the ACL should be

  20. Managing the Complexity of Large Free and Open Source Package-Based Software Distributions

    Microsoft Academic Search

    Fabio Mancinelli; Jaap Boender; Roberto Di Cosmo; Jerome Vouillon; Berke Durak; Xavier Leroy; Ralf Treinen

    2006-01-01

    The widespread adoption of Free and Open Source Soft- ware (FOSS) in many strategic contexts of the information technology society has drawn the attention on the issues re- garding how to handle the complexity of assembling and managing a huge number of (packaged) components in a consistent and effective way. FOSS distributions (and in particular GNU\\/Linux-based ones) have always provided

  1. The Adoption of Open Source Systems in Public Administrations

    Microsoft Academic Search

    Carmen de Pablos; David López

    \\u000a This study presents the results of a research conducted for a group of eighteen Public Administrations migrating their systems\\u000a to open source standards. Public Administrations perceive improvements in the way they offer services, a reduction of the\\u000a costs and better secured information systems. The migration to open source standards allows Public Administration to offer\\u000a alternative channels for their relationship with

  2. OpenDanubia - An integrated, modular simulation system to support regional water resource management

    NASA Astrophysics Data System (ADS)

    Muerth, M.; Waldmann, D.; Heinzeller, C.; Hennicker, R.; Mauser, W.

    2012-04-01

    The already completed, multi-disciplinary research project GLOWA-Danube has developed a regional scale, integrated modeling system, which was successfully applied on the 77,000 km2 Upper Danube basin to investigate the impact of Global Change on both the natural and anthropogenic water cycle. At the end of the last project phase, the integrated modeling system was transferred into the open source project OpenDanubia, which now provides both the core system as well as all major model components to the general public. First, this will enable decision makers from government, business and management to use OpenDanubia as a tool for proactive management of water resources in the context of global change. Secondly, the model framework to support integrated simulations and all simulation models developed for OpenDanubia in the scope of GLOWA-Danube are further available for future developments and research questions. OpenDanubia allows for the investigation of water-related scenarios considering different ecological and economic aspects to support both scientists and policy makers to design policies for sustainable environmental management. OpenDanubia is designed as a framework-based, distributed system. The model system couples spatially distributed physical and socio-economic process during run-time, taking into account their mutual influence. To simulate the potential future impacts of Global Change on agriculture, industrial production, water supply, households and tourism businesses, so-called deep actor models are implemented in OpenDanubia. All important water-related fluxes and storages in the natural environment are implemented in OpenDanubia as spatially explicit, process-based modules. This includes the land surface water and energy balance, dynamic plant water uptake, ground water recharge and flow as well as river routing and reservoirs. Although the complete system is relatively demanding on data requirements and hardware requirements, the modular structure and the generic core system (Core Framework, Actor Framework) allows the application in new regions and the selection of a reduced number of modules for simulation. As part of the Open Source Initiative in GLOWA-Danube (opendanubia.glowa-danube.de) a comprehensive documentation for the system installation was created and both the program code of the framework and of all major components is licensed under the GNU General Public License. In addition, some helpful programs and scripts necessary for the operation and processing of input and result data sets are provided.

  3. On Deadlock Detection in Distributed Systems

    Microsoft Academic Search

    Virgil D. Gligor; Susan H. Shattuck

    1980-01-01

    A hierarchically organized and a distributed protocol for deadlock detection in distributed databases are presented in [1]. In this paper we show that the distributed protocol is incorrect, and present possible remedies. However, the distributed protocol remains impractical because \\

  4. Distribution System Analysis Tools for Studying High Penetration of PV

    E-print Network

    Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support Features Electric Energy System #12;#12;Distribution System Analysis Tools for Studying High Penetration of PV project titled "Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support

  5. A DISTRIBUTED INTELLIGENT AUTOMATED DEMAND RESPONSE BUILDING MANAGEMENT SYSTEM

    SciTech Connect

    Auslander, David; Culler, David; Wright, Paul; Lu, Yan; Piette, Mary

    2013-12-30

    The goal of the 2.5 year Distributed Intelligent Automated Demand Response (DIADR) project was to reduce peak electricity load of Sutardja Dai Hall at UC Berkeley by 30% while maintaining a healthy, comfortable, and productive environment for the occupants. We sought to bring together both central and distributed control to provide “deep” demand response1 at the appliance level of the building as well as typical lighting and HVAC applications. This project brought together Siemens Corporate Research and Siemens Building Technology (the building has a Siemens Apogee Building Automation System (BAS)), Lawrence Berkeley National Laboratory (leveraging their Open Automated Demand Response (openADR), Auto-­Demand Response, and building modeling expertise), and UC Berkeley (related demand response research including distributed wireless control, and grid-­to-­building gateway development). Sutardja Dai Hall houses the Center for Information Technology Research in the Interest of Society (CITRIS), which fosters collaboration among industry and faculty and students of four UC campuses (Berkeley, Davis, Merced, and Santa Cruz). The 141,000 square foot building, occupied in 2009, includes typical office spaces and a nanofabrication laboratory. Heating is provided by a district heating system (steam from campus as a byproduct of the campus cogeneration plant); cooling is provided by one of two chillers: a more typical electric centrifugal compressor chiller designed for the cool months (Nov-­ March) and a steam absorption chiller for use in the warm months (April-­October). Lighting in the open office areas is provided by direct-­indirect luminaries with Building Management System-­based scheduling for open areas, and occupancy sensors for private office areas. For the purposes of this project, we focused on the office portion of the building. Annual energy consumption is approximately 8053 MWh; the office portion is estimated as 1924 MWh. The maximum peak load during the study period was 1175 kW. Several new tools facilitated this work, such as the Smart Energy Box, the distributed load controller or Energy Information Gateway, the web-­based DR controller (dubbed the Central Load-­Shed Coordinator or CLSC), and the Demand Response Capacity Assessment & Operation Assistance Tool (DRCAOT). In addition, an innovative data aggregator called sMAP (simple Measurement and Actuation Profile) allowed data from different sources collected in a compact form and facilitated detailed analysis of the building systems operation. A smart phone application (RAP or Rapid Audit Protocol) facilitated an inventory of the building’s plug loads. Carbon dioxide sensors located in conference rooms and classrooms allowed demand controlled ventilation. The extensive submetering and nimble access to this data provided great insight into the details of the building operation as well as quick diagnostics and analyses of tests. For example, students discovered a short-­cycling chiller, a stuck damper, and a leaking cooling coil in the first field tests. For our final field tests, we were able to see how each zone was affected by the DR strategies (e.g., the offices on the 7th floor grew very warm quickly) and fine-­tune the strategies accordingly.

  6. The Binary INformation from Open Clusters using SEDs (BINOCS) Project: Radial Migration of Binary Systems in Open Clusters

    NASA Astrophysics Data System (ADS)

    Thompson, Benjamin A.; Frinchaboy, Peter M.

    2015-01-01

    A majority of stars are formed in open clusters, and then ejected into the Galactic field population through gravitational interactions. Therefore, understanding the internal dynamics of open clusters, through N-Body simulations, will inform the growth of the Galactic stellar population. A major input into these N-Body simulations is the frequency and mass distribution of binary star systems. Current binary detection techniques, such as radial velocity studies, are limited in depth, and therefore provide information only over a very limited mass range. As presented in the literature, different mass ranges may produce different interpretations of the observed binary population. A clearer picture of the binary population, covering a wide mass range, is needed to improve cluster simulations. We introduce a new binary detection method, Binary INformation from Open Clusters Using SEDs (BINOCS). Using newly-observed multi-wavelength photometric catalogs (0.3 - 8 micron) of the key open clusters M35, M36, M37, M67 and NGC 2420, the BINOCS method is able to determine accurate component masses for unresolved cluster binaries. We present results on the dynamical evolution of binaries from 0.4 - 2.5 M_sun within these key clusters, and explore how these results change with mass.

  7. An Open-System Quantum Simulator with Trapped Ions

    E-print Network

    Julio T. Barreiro; Markus Müller; Philipp Schindler; Daniel Nigg; Thomas Monz; Michael Chwalla; Markus Hennrich; Christian F. Roos; Peter Zoller; Rainer Blatt

    2011-04-06

    The control of quantum systems is of fundamental scientific interest and promises powerful applications and technologies. Impressive progress has been achieved in isolating the systems from the environment and coherently controlling their dynamics, as demonstrated by the creation and manipulation of entanglement in various physical systems. However, for open quantum systems, engineering the dynamics of many particles by a controlled coupling to an environment remains largely unexplored. Here we report the first realization of a toolbox for simulating an open quantum system with up to five qubits. Using a quantum computing architecture with trapped ions, we combine multi-qubit gates with optical pumping to implement coherent operations and dissipative processes. We illustrate this engineering by the dissipative preparation of entangled states, the simulation of coherent many-body spin interactions and the quantum non-demolition measurement of multi-qubit observables. By adding controlled dissipation to coherent operations, this work offers novel prospects for open-system quantum simulation and computation.

  8. Building a generalized distributed system model

    NASA Technical Reports Server (NTRS)

    Mukkamala, R.

    1993-01-01

    The key elements in the 1992-93 period of the project are the following: (1) extensive use of the simulator to implement and test - concurrency control algorithms, interactive user interface, and replica control algorithms; and (2) investigations into the applicability of data and process replication in real-time systems. In the 1993-94 period of the project, we intend to accomplish the following: (1) concentrate on efforts to investigate the effects of data and process replication on hard and soft real-time systems - especially we will concentrate on the impact of semantic-based consistency control schemes on a distributed real-time system in terms of improved reliability, improved availability, better resource utilization, and reduced missed task deadlines; and (2) use the prototype to verify the theoretically predicted performance of locking protocols, etc.

  9. Next Generation Multimedia Distributed Data Base Systems

    NASA Technical Reports Server (NTRS)

    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.

  10. Fiber distribution system for microcellular radio

    NASA Astrophysics Data System (ADS)

    Wu, Jingshown; Wu, Jiunn-Shyen; Tsao, Hen-W.

    1994-09-01

    A new fiber distribution system for mobile phone networks is proposed. In the system, at the base station, a single high power low relative intensity noise Nd:YAG laser is employed and shared by many microcells. At the radio port, an optical coupler is used to split the optical power into two ways: one for the downstream signal detection and the other remodulated by an amplitude modulator for the upstream signal. With proper frequency allocation, some intermodulation distortion can be prevented from falling into the band of the upstream signal. Theoretical analysis shows that this system, in conjunction with thermal noise suppression and modulator linearization techniques, may increase the channel capacity and enhance frequency reuse significantly.

  11. RESEARCH Open Access Local and systemic innate immune response

    E-print Network

    Paris-Sud XI, Université de

    RESEARCH Open Access Local and systemic innate immune response to secondary human peritonitis: Peritonitis triggers an acute systemic and peritoneal innate immune response with a simultaneous release, there is a paucity of data regard- ing systemic and local innate immune responses during peritonitis in humans

  12. A Conceptual Approach to an Open Hospital Information System

    Microsoft Academic Search

    K. Kuhn; M. Reichert; M. Nathe; T. Beuter; C. Heinlein; P. Dadam

    1994-01-01

    this paper is to describe a research project funded by the state of BadenWuerttembergin Germany. The project is aimed at the systematic analysis of information systems needsfor an integrated open system of the future that is capable of truly integrating heterogeneous componentsand leaving a maximum of autonomy to the cooperating systems. Current developments in computerscience methods are being evaluated under

  13. Control of a two Level Open Quantum System

    E-print Network

    Sontag, Eduardo

    Control of a two Level Open Quantum System Domenico D'Alessandro Department of Mathematics controls. 1 Introduction The possibility of actively controlling the state of quantum mechanical systems], [12], [13], [17]). If the requirement for a control law is to steer the state of the system from

  14. An Open Development Environment for Evaluation of Video Surveillance Systems

    Microsoft Academic Search

    Christopher Jaynes; Stephen Webb; R. Matt Steele; Quanren Xiong

    2002-01-01

    We introduce the publicly available Open Development for Video Surveillance (ODViS) system that is specifically designed to support ongoing research in tracking and video surveillance. The system provides researchers with the ability to prototype tracking and event recognition techniques, to construct and manage ground truth data sets, and to evaluate the performance of these systems within a graphical user interface.

  15. A multimodal biometrics system implemented using open source technology

    Microsoft Academic Search

    Ivan Milenkovic; Vladan Pantovic; Dusan Starcevic; Miroslav Minovic

    2011-01-01

    Because of the rising need for reliable biometric systems, finding different ways for improving biometric system performance becomes a significant problem. A solution to this problem is the integration of more different biometric modalities, known as multimodal biometrics. In this paper a description of a real multimodal biometrics system, developed on Faculty of organisational sciences using open source technology is

  16. Effect of queueing disciplines on response times in distributed systems

    Microsoft Academic Search

    1984-01-01

    A distributed program consists of processes, many of which can execute concurrently on different processors in a distributed system of processors. When several processes from the same or different distributed programs have been assigned to a processor in a distributed system, the processor must select the next process to run. The question investigated is: What is an appropriate method for

  17. Open Source Initiative in Digital Preservation: The Need for an Open Source Digital Repository and Preservation System

    Microsoft Academic Search

    L Shanta Meitei; Purnima Devi

    The paper discusses the Open Source Software in digital preservation for digital repository and preservation system. The paper highlights the need and features of Open Source Software in Digital Preservation with the successful adoption of open source application for library and information management system in this global digital information environment. The paper also discusses some of the important Initiatives of

  18. Galileo spacecraft power management and distribution system

    NASA Technical Reports Server (NTRS)

    Detwiler, R. C.; Smith, R. L.

    1990-01-01

    The Galileo PMAD (power management and distribution system) is described, and the design drivers that established the final as-built hardware are discussed. The spacecraft is powered by two general-purpose heat-source-radioisotope thermoelectric generators. Power bus regulation is provided by a shunt regulator. Galileo PMAD distributes a 570-W beginning of mission (BOM) power source to a user complement of some 137 load elements. Extensive use of pyrotechnics requires two pyro switching subassemblies. They initiate 148 squibs which operate the 47 pyro devices on the spacecraft. Detection and correction of faults in the Galileo PMAD is an autonomous feature dictated by requirements for long life and reliability in the absence of ground-based support. Volatile computer memories in the spacecraft command and data system and attitude control system require a continuous source of backup power during all anticipated power bus fault scenarios. Power for the Jupiter Probe is conditioned, isolated, and controlled by a Probe interface subassembly. Flight performance of the spacecraft and the PMAD has been successful to date, with no major anomalies.

  19. Distributed Online Learning in Social Recommender Systems

    NASA Astrophysics Data System (ADS)

    Tekin, Cem; Zhang, Simpson; van der Schaar, Mihaela

    2014-08-01

    In this paper, we consider decentralized sequential decision making in distributed online recommender systems, where items are recommended to users based on their search query as well as their specific background including history of bought items, gender and age, all of which comprise the context information of the user. In contrast to centralized recommender systems, in which there is a single centralized seller who has access to the complete inventory of items as well as the complete record of sales and user information, in decentralized recommender systems each seller/learner only has access to the inventory of items and user information for its own products and not the products and user information of other sellers, but can get commission if it sells an item of another seller. Therefore the sellers must distributedly find out for an incoming user which items to recommend (from the set of own items or items of another seller), in order to maximize the revenue from own sales and commissions. We formulate this problem as a cooperative contextual bandit problem, analytically bound the performance of the sellers compared to the best recommendation strategy given the complete realization of user arrivals and the inventory of items, as well as the context-dependent purchase probabilities of each item, and verify our results via numerical examples on a distributed data set adapted based on Amazon data. We evaluate the dependence of the performance of a seller on the inventory of items the seller has, the number of connections it has with the other sellers, and the commissions which the seller gets by selling items of other sellers to its users.

  20. Distributed, cooperating knowledge-based systems

    NASA Technical Reports Server (NTRS)

    Truszkowski, Walt

    1991-01-01

    Some current research in the development and application of distributed, cooperating knowledge-based systems technology is addressed. The focus of the current research is the spacecraft ground operations environment. The underlying hypothesis is that, because of the increasing size, complexity, and cost of planned systems, conventional procedural approaches to the architecture of automated systems will give way to a more comprehensive knowledge-based approach. A hallmark of these future systems will be the integration of multiple knowledge-based agents which understand the operational goals of the system and cooperate with each other and the humans in the loop to attain the goals. The current work includes the development of a reference model for knowledge-base management, the development of a formal model of cooperating knowledge-based agents, the use of testbed for prototyping and evaluating various knowledge-based concepts, and beginning work on the establishment of an object-oriented model of an intelligent end-to-end (spacecraft to user) system. An introductory discussion of these activities is presented, the major concepts and principles being investigated are highlighted, and their potential use in other application domains is indicated.

  1. An Open Simulation System Model for Scientific Applications

    NASA Technical Reports Server (NTRS)

    Williams, Anthony D.

    1995-01-01

    A model for a generic and open environment for running multi-code or multi-application simulations - called the open Simulation System Model (OSSM) - is proposed and defined. This model attempts to meet the requirements of complex systems like the Numerical Propulsion Simulator System (NPSS). OSSM places no restrictions on the types of applications that can be integrated at any state of its evolution. This includes applications of different disciplines, fidelities, etc. An implementation strategy is proposed that starts with a basic prototype, and evolves over time to accommodate an increasing number of applications. Potential (standard) software is also identified which may aid in the design and implementation of the system.

  2. Non-Markovian dynamics in open quantum systems

    E-print Network

    Heinz-Peter Breuer; Elsi-Mari Laine; Jyrki Piilo; Bassano Vacchini

    2015-05-06

    The dynamical behavior of open quantum systems plays a key role in many applications of quantum mechanics, examples ranging from fundamental problems, such as the environment-induced decay of quantum coherence and relaxation in many-body systems, to applications in condensed matter theory, quantum transport, quantum chemistry and quantum information. In close analogy to a classical Markov process, the interaction of an open quantum system with a noisy environment is often modelled by a dynamical semigroup with a generator in Lindblad form, which describes a memoryless dynamics leading to an irreversible loss of characteristic quantum features. However, in many applications open systems exhibit pronounced memory effects and a revival of genuine quantum properties such as quantum coherence and correlations. Here, recent results on the rich non-Markovian quantum dynamics of open systems are discussed, paying particular attention to the rigorous mathematical definition, to the physical interpretation and classification, as well as to the quantification of memory effects. The general theory is illustrated by a series of examples. The analysis reveals that memory effects of the open system dynamics reflect characteristic features of the environment which opens a new perspective for applications, namely to exploit a small open system as a quantum probe signifying nontrivial features of the environment it is interacting with. This article further explores the various physical sources of non-Markovian quantum dynamics, such as structured spectral densities, nonlocal correlations between environmental degrees of freedom and correlations in the initial system-environment state, in addition to developing schemes for their local detection. Recent experiments on the detection, quantification and control of non-Markovian quantum dynamics are also discussed.

  3. The AI Bus architecture for distributed knowledge-based systems

    NASA Technical Reports Server (NTRS)

    Schultz, Roger D.; Stobie, Iain

    1991-01-01

    The AI Bus architecture is layered, distributed object oriented framework developed to support the requirements of advanced technology programs for an order of magnitude improvement in software costs. The consequent need for highly autonomous computer systems, adaptable to new technology advances over a long lifespan, led to the design of an open architecture and toolbox for building large scale, robust, production quality systems. The AI Bus accommodates a mix of knowledge based and conventional components, running on heterogeneous, distributed real world and testbed environment. The concepts and design is described of the AI Bus architecture and its current implementation status as a Unix C++ library or reusable objects. Each high level semiautonomous agent process consists of a number of knowledge sources together with interagent communication mechanisms based on shared blackboards and message passing acquaintances. Standard interfaces and protocols are followed for combining and validating subsystems. Dynamic probes or demons provide an event driven means for providing active objects with shared access to resources, and each other, while not violating their security.

  4. Impact of distributed resources on system dynamic performance

    Microsoft Academic Search

    N. W. Miller; R. A. Walling; A. S. Achilles

    2001-01-01

    This panel session describes the potential impacts of distributed resources on the voltage and dynamic behavior of power systems. Simulations and discussion about the performance of large systems with significant penetration of distributed resources are provided

  5. 49 CFR 192.747 - Valve maintenance: Distribution systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 2013-10-01 2013-10-01 false Valve maintenance: Distribution systems. 192...SAFETY STANDARDS Maintenance § 192.747 Valve maintenance: Distribution systems. (a) Each valve, the use of which may be necessary...

  6. 49 CFR 192.747 - Valve maintenance: Distribution systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 2011-10-01 2011-10-01 false Valve maintenance: Distribution systems. 192...SAFETY STANDARDS Maintenance § 192.747 Valve maintenance: Distribution systems. (a) Each valve, the use of which may be necessary...

  7. Accountability in Cloud Computing and Distributed Computer Systems Hongda Xiao

    E-print Network

    Feigenbaum, Joan

    Abstract Accountability in Cloud Computing and Distributed Computer Systems Hongda Xiao 2014, authentication protocols, and encryption. With the rise of internet technologies, especially cloud computing mechanisms for realistic scenarios in cloud computing and distributed computer systems. First, we propose

  8. On-Site Wastewater Treatment Systems: Spray Distribution 

    E-print Network

    Lesikar, Bruce J.

    1999-09-06

    A spray distribution system is very similar to a lawn irrigation system. Spray heads are used to distribute treated wastewater to the surface of the yard. This publication explains the advantages and disadvantages of spray ...

  9. Equilibrium Constant as Solution to the Open Chemical Systems

    E-print Network

    Zilbergleyt, B

    2008-01-01

    According to contemporary views, equilibrium constant is relevant only to true thermodynamic equilibria in isolated systems with one chemical reaction. The paper presents a novel formula that ties-up equilibrium constant and chemical system composition at any state, isolated or open as well. Extending the logarithmic logistic map of the Discrete Thermodynamics of Chemical Equilibria, this formula maps the system population at isolated equilibrium into the population at any open equilibrium at p,T=const, using equilibrium constant as a measure. Real chemical systems comprise multiple subsystems; given the resources are limited, joint solution to the set of such expressions, each relevant to a specific subsystem, gives equilibrium composition for each of them. This result means a fundamental break through in the open systems thermodynamics and leads to formerly unknown opportunities in the analysis of real chemical objects.

  10. Analysis and control of distributed cooperative systems.

    SciTech Connect

    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. Requirements specification of distributed hard real-time operating systems

    Microsoft Academic Search

    ManSang Chung; Heonshik Shin

    1991-01-01

    The authors present the requirements specification for distributed hard real-time operating systems used in time-critical, mission-oriented systems. For this purpose the relevant models for distributed hard real-time processing are established based on the general characteristics of distributed hard real-time systems. Following these models the requirements of a distributed hard real-time operating system are specified, and the major concerns in requirements

  12. CODA: a scalable, distributed data acquisition system

    SciTech Connect

    David Quarrie; Edward Jastrzembski; William Heyes; Jie Chen; William Watson

    1994-02-01

    A new data acquisition system has been designed for physics experiments scheduled to run at CEBAF starting in the summer of 1994. This system runs on Unix workstations connected via ethernet, FDDI, or other network hardware to multiple intelligent front end crates-VME, CAMAC or FASTBUS. CAMAC crates may either contain intelligent processors, or may be interfaced to VME. The system is modular and scalable, from a single front end crate and one workstation linked by ethernet, to as many as 32 clusters of front end crates ultimately connected via a high speed network to a set of analysis workstations. The system includes an extensible, device independent slow controls package with drivers for CAMAC, VME, and high voltage crates, as well as a link to CEBAF accelerator controls. All distributed processes are managed by standard remote procedure calls propagating change-of-state requests, or reading and writing program variables. Custom components may be easily integrated. The system is portable to any front end processor running the VxWorks real-time kernel, and to most workstations supplying a few standard facilities such as rsh and X-windows, and Motif and socket libraries. Sample implementations exist for 2 Unix workstation families connected via ethernet or FDDI to VME (with interfaces to FASTBUS or CAMAC), and via ethernet to FASTBUS or CAMAC

  13. CODA: A scalable, distributed data acquisition system

    SciTech Connect

    Watson, W.A. III; Chen, J.; Heyes, G.; Jastrzembski, E.; Quarrie, D. (CEBAF, Newport News, VA (United States))

    1994-02-01

    A new data acquisition system has been designed for physics experiments scheduled to run at CEBAF starting in the summer of 1994. This system runs on Unix workstations connected via ethernet, FDDI, or other network hardware to multiple intelligent front end crates -- VME, CAMAC or FASTBUS. CAMAC crates may either contain intelligent processors, or may be interfaced to VME. The system is modular and scalable, from a single front end crate and one workstation linked by ethernet, to as may as 32 clusters of front end crates ultimately connected via a high speed network to a set of analysis workstations. The system includes an extensible, device independent slow controls package with drivers for CAMAC, VME, and high voltage crates, as well as a link to CEBAF accelerator controls. All distributed processes are managed by standard remote procedure calls propagating change-of-state requests, or reading and writing program variables. Custom components may be easily integrated. The system is portable to any front end processor running the VxWorks real-time kernel, and to most workstations supplying a few standard facilities such as rsh and X-windows, and Motif and socket libraries. Sample implementations exist for 2 Unix workstation families connected via ethernet or FDDI to VME (with interfaces to FASTBUS or CAMAC), and via ethernet to FASTBUS or CAMAC.

  14. Distributed intelligence for ground/space systems

    NASA Technical Reports Server (NTRS)

    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.

  15. CODA: A sealable, distributed data acquisition system

    NASA Astrophysics Data System (ADS)

    Weston, W. A., III; Chen, J.; Heyes, G.; Jastrzembski, E.; Quarrie, D.

    1994-02-01

    A new data acquisition system has been designed for physics experiments scheduled to run at CEBAF starting in the summer of 1994. This system runs on Unix workstation connected via Ethernet, FDDI, or other network hardware to multiple intelligent front end crates -- VME, CAMAC or FASTBUS. CAMAC crates may either contain intelligent processors, or may be interfaced to VME. The system is modular and scalable, from a single front end crate and one workstation linked by Ethernet, to as many as 32 clusters of front end crates ultimately connected via a high speed network to a set of analysis workstation. The system included an extensible, device independent slow controls package with drivers for CEBAF accelerator controls. All distributed process are managed by standard remote procedure calls propagating change-of-state requests, or reading and writing program variables. Custom components may be easily integrated. The system is portable to any front end processor running the VxWorks real-time kernel, and to most workstation supplying a few standard facilities such as rsh and X-windows, and Motif and socket libraries. Sample implementation exist for 2 Unix workstation families connected via Ethernet or FDDI to VME (with interface to FASTBUS or CAMAC), and via Ethernet to FASTBUS or CAMAC.

  16. Distributed health care imaging information systems

    NASA Astrophysics Data System (ADS)

    Thompson, Mary R.; Johnston, William E.; Guojun, Jin; Lee, Jason; Tierney, Brian; Terdiman, Joseph F.

    1997-05-01

    We have developed an ATM network-based system to collect and catalogue cardio-angiogram videos from the source at a Kaiser central facility and make them available for viewing by doctors at primary care Kaiser facilities. This an example of the general problem of diagnostic data being generated at tertiary facilities, while the images, or other large data objects they produce, need to be used from a variety of other locations such as doctor's offices or local hospitals. We describe the use of a highly distributed computing and storage architecture to provide all aspects of collecting, storing, analyzing, and accessing such large data-objects in a metropolitan area ATM network. Our large data-object management system provides network interface between the object sources, the data management system and the user of the data. As the data is being stored, a cataloguing system automatically creates and stores condensed versions of the data, textural metadata and pointers to the original data. The catalogue system provides a Web-based graphical interface to the data. The user is able the view the low-resolution data with a standard Internet connection and Web browser. If high-resolution is required, a high-speed connection and special application programs can be used to view the high-resolution original data.

  17. Remote procedure execution software for distributed systems

    SciTech Connect

    Petravick, D.L.; Berman, E.F.; Sergey, G.P.

    1989-05-01

    Remote Procedure Execution facilitates the construction of distributed software systems, spanning computers of various types. Programmers who use the RPX package specify subroutine calls which are to be executed on a remote computer. RPX is used to generate code for dummy routines which transmit input parameters and receive output parameters, as well as a main program which receives procedure call requests, calls the requested procedure, and returns the result. The package automatically performs datatype conversions and uses an appropriate connection oriented protocol. Supported operating systems/processors are VMS(VAX), UNIX(MIPS R2000, R3000) and Software Components Group's pSOS (680x0). Connection oriented protocols are supported over Ethernet (TCP/IP) and RS232 (a package of our own design). 2 refs., 2 figs.

  18. Complete Positivity and Thermodynamics in a Driven Open Quantum System

    NASA Astrophysics Data System (ADS)

    Argentieri, Giuseppe; Benatti, Fabio; Floreanini, Roberto; Pezzutto, Marco

    2015-06-01

    While it is well known that complete positivity guarantees the fulfilment of the second law of thermodynamics, its possible violations have never been proposed as a check of the complete positivity of a given open quantum dynamics. We hereby consider an open quantum micro-circuit, effectively describable as a two-level open quantum system, whose asymptotic current might be experimentally accessible. This latter could indeed be used to discriminate between its possible non-completely positive Redfield dynamics and a completely positive one obtained by standard weak-coupling limit techniques, at the same time verifying the fate of the second law of thermodynamics in such a context.

  19. Complete positivity and thermodynamics in a driven open quantum system

    E-print Network

    G. Argentieri; F. Benatti; R. Floreanini; M. Pezzutto

    2015-02-03

    While it is well known that complete positivity guarantees the fulfilment of the second law of thermodynamics, its possible violations have never been proposed as a check of the complete positivity of a given open quantum dynamics. We hereby consider an open quantum micro-circuit, effectively describable as a two-level open quantum system, whose asymptotic current might be experimentally accessible. This latter could indeed be used to discriminate between its possible non-completely positive Redfield dynamics and a completely positive one obtained by standard weak-coupling limit techniques, at the same time verifying the fate of the second law of thermodynamics in such a context.

  20. Distributed control system for turbine engines

    SciTech Connect

    Shaffer, P.L. [General Electric Aircraft Engines, Cincinnati, OH (United States)

    1999-01-01

    A distributed control system (DCS) for a turbine engine has been demonstrated and tested, consisting of prototype electronic interface units (EIUs) connected to data and power busses. In the DCS, a central control computer communicated with smart sensors and smart actuators via a 2.5 megabit/sec digital data bus, using the Fieldbus protocol. Power was distributed to the smart devices as 100 kHz 100V peak AC, allowing light, simple power converters at each smart device. All smart sensors, smart actuators, and cables were dual redundant. The smart actuators received position demand from the central control computer, exchanged data between channels to provide local redundancy management, closed the position loop locally, and reported actuator position to the central controller. Smart sensors converted sensed signals to digital values in engineering units, and performed local built-in tests. Testing of the DCS was done in a closed-loop simulation with an engine model. Frequency response of the DCS was almost identical with the conventional system.

  1. HPC: A Model of Structure and Change in Distributed Systems

    Microsoft Academic Search

    Thomas J. Leblanc; Stuart A. Friedberg

    1985-01-01

    Distributed systems must provide certain fundamental facilities including communication. protection. resource management, reliability. and process (computation) abstraction. Current designs for distributed systems tend to focus on only one of these issues; support for multiprocess structures has been especially neglected. The HPC model, an object-oriented model of interprocess relationships for distributed systems. addresses all of these fundamental services. The major novelties

  2. PARALLEL SIMULATION OF LARGE-SCALE WATER DISTRIBUTION SYSTEMS

    E-print Network

    Bargiela, Andrzej

    PARALLEL SIMULATION OF LARGE-SCALE WATER DISTRIBUTION SYSTEMS J.K. Hartley, A. Bargiela, R.J. Cant in the specific context of water distribution networks. Today's increasing complexity of such systems, together recovery from measurement failure situations. INTRODUCTION Water distribution systems are large

  3. Methods for Knowledge based Controlling of Distributed Systems

    E-print Network

    Paris-Sud XI, Université de

    Methods for Knowledge based Controlling of Distributed Systems Saddek Bensalem1 , Marius Bozga1 property [14]. For distributed systems, this has also been shown to be undecidable [18, 17]. Under distributed systems. We identify the main problem of the knowledge approach in using the controlled (source

  4. Structure and Encapsulation in Distributed Systems: the Proxy Principle

    E-print Network

    Paris-Sud XI, Université de

    Structure and Encapsulation in Distributed Systems: the Proxy Principle Marc Shapiro INRIA, B Proc. 6th Int. Conf. on Distributed Computing Systems (ICDCS), Cambridge MA (USA), May 1986, pages 198­204. Abstract We present a novel view of the structuring of distributed systems, and a few examples of its

  5. Distributed Operating Systems ANDREW S. TANENBAUM and ROBBERT VAN RENESSE

    E-print Network

    Newhall, Tia

    Distributed Operating Systems ANDREW S. TANENBAUM and ROBBERT VAN RENESSE Department of Mathematics and Computer Science, Vrije Universiteit, Amsterdam, The Netherlands Distributed operating systems have many as an introduction to distributed operating systems, and especially to current university research about them. After

  6. Weevil: a Tool to Automate Experimentation With Distributed Systems

    E-print Network

    Carzaniga, Antonio

    Weevil: a Tool to Automate Experimentation With Distributed Systems Yanyan Wang Matthew J distributed systems is a challenging activity. This is partly due to the intrinsic complexity of dis- tributed that characterize the client behaviors that drive the experiments, the distributed system under experimentation

  7. RECURSIVELY STRUCTURED DISTRIBUTED COMPUTING SYSTEMS University of Newcastle upon Tyne

    E-print Network

    Newcastle upon Tyne, University of

    1 RECURSIVELY STRUCTURED DISTRIBUTED COMPUTING SYSTEMS B. Randell University of Newcastle upon Tyne ABSTRACT Two design rules which aid the construction of distributed computing systems and the provision of fault tolerance are described, namely that: (i) a distributed computing system should be functionally

  8. Distributed delays stabilize neural feedback systems Ulrike Meyer,1

    E-print Network

    Brandt, Sebastian

    Distributed delays stabilize neural feedback systems Ulrike Meyer,1 Jing Shao,2 Saurish Chakrabarty 30, 2007) We consider the effect of distributed delays in neural feedback systems. The avian optic on system dynamics raises the question whether a broad delay distribution can impact the dynamics of neural

  9. SOME COMPARTMENTALIZED SECURE TASK ASSIGNMENT MODELS FOR DISTRIBUTED SYSTEMS

    E-print Network

    Lee, Daniel C.

    SOME COMPARTMENTALIZED SECURE TASK ASSIGNMENT MODELS FOR DISTRIBUTED SYSTEMS Daniel C. Lee , Member) in a distributed system with a goal that they can perform its global task efficiently. The paper models the distributed system with a graph that describes the communication capabilities of the constituting agents

  10. Models as Parts of Distributed Cognitive Systems RONALD N. GIERE

    E-print Network

    Giere, Ronald N.

    Models as Parts of Distributed Cognitive Systems RONALD N. GIERE Department of Philosophy, Center of many models as being components of distributed cognitive systems. I begin by distinguishing the relevant notion of a distributed cognitive system and then give examples of different kinds of models

  11. Distributed Dynamics of Systems with Closed Kinematic Chains

    E-print Network

    Krovi, Venkat

    Distributed Dynamics of Systems with Closed Kinematic Chains Waseem Ahmad Khan wakhan@cim.mcgill.ca Centre for Intelligent Machines, McGill University Distributed Dynamics of Systems with Closed Kinematic Distributed Dynamics of Systems with Closed Kinematic Chains ­ p.2/45 #12;Introduction Problems associated

  12. A Model for Knowledge Representation in Distributed Systems

    E-print Network

    Paris-Sud XI, Université de

    A Model for Knowledge Representation in Distributed Systems Brunet Olivier December 4, 2002 in a general theory of information representation in distributed system. Following this, we set up a framework distributed systems. Finally, we study the logical structure of this framework and show that in this formalism

  13. STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE

    E-print Network

    STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08 DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08/09) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE MECH-14A NA7.5.13 Distributed Energy Storage DX AC Systems Acceptance (Page 2 of 3

  14. Snapshot on the EDOS Distribution System Serge Abiteboul

    E-print Network

    Abiteboul, Serge

    Snapshot on the EDOS Distribution System Serge Abiteboul INRIA serge.abiteboul@inria.fr Itay Dar a distribution system that tackles two main issues in the software content management: efficient content the overall function- alities. The aim of the EDOS [7] Distribution System is to merge and to exploit

  15. OBSERVED HYBRID OSCILLATIONS IN AN ELECTRICAL DISTRIBUTION SYSTEM Vaibhav Donde

    E-print Network

    OBSERVED HYBRID OSCILLATIONS IN AN ELECTRICAL DISTRIBUTION SYSTEM Vaibhav Donde Lawrence Berkeley oscillations, with a period of around 15 minutes, were observed in an 11kV electrical distribution system-state behaviour. 1. INTRODUCTION A number of years ago, the voltage of an 11kV distribution system exhibited

  16. Amoeba: A Distributed Operating System for the 1990s

    Microsoft Academic Search

    Sape J. Mullender; Guido Van Rossum; Andrew S. Tanenbaum; Robbert Van Renesse; Hans Van Staveren

    1990-01-01

    Amoeba is the distributed system developed at the Free University (VU) and Centre for Mathematics and Computer Science (CWI), both in Amsterdam. Throughout the project's ten-year history, a major concern of the designers has been to combine the research themes of distributed systems, such as high availability, use of parallelism and scalability, with simplicity and high performance. Distributed systems are

  17. Design and implementation of cooperative distributed dental medical information system

    Microsoft Academic Search

    Xiaolin Lu

    2005-01-01

    Computer supported cooperative work (CSCW) provides a technology to design the medical information systems that allow doctors located in distributed locations to carry on the cooperative healthcare processes. This paper describes the design and development of a cooperative distributed dental medical system for remote computer-supported cooperative medical diagnosis. The system is based on a multilayers distributed architecture, and is comprised

  18. Deploying Complex Applications in Unfriendly Distributed Systems with Parrot

    E-print Network

    Wisconsin at Madison, University of

    Deploying Complex Applications in Unfriendly Distributed Systems with Parrot ((PREPRINT VERSION that are endemic to distributed systems. To solve this problem, we present Parrot, an interposition agent that connects standard, unmodified applications to distributed systems. Parrot makes use of the debugging

  19. PAPR and amplitude distribution in MC-CDMA system

    Microsoft Academic Search

    Zbynek Fedra; Jiri Blumenstein

    2010-01-01

    This paper analyzes the crash factor (CF) for multicarrier code division multiple access (MC-CDMA) communication system. The CF (or peak to average power ratio - PAPR) is critical in multicarrier orthogonal systems (based on orthogonal frequency division multiplex - OFDM). The amplitude statistics for system are computed and gamma distribution is considered for amplitude distribution modeling. The distribution parameters are

  20. Distribution System Analysis to support the Smart Grid

    Microsoft Academic Search

    R. C. Dugan; R. F. Arritt; T. E. McDermott; S. M. Brahma; K. Schneider

    2010-01-01

    The “Smart Grid” refers to various efforts to modernize the power grid through the application of intelligent devices. This paper describes current thinking by members of the Distribution System Analysis Subcommittee (DSA SC) on how distribution system analysis might evolve to support the Smart Grid. Various issues related to Smart Grid and distribution system analysis are identified. The essential characteristics

  1. HASS: Highly Available, Scalable and Secure Distributed Data Storage Systems

    Microsoft Academic Search

    Zhiqian Xu; Hai Jiang

    2009-01-01

    As computers become pervasive and data size increases dramatically, data management systems' security, scalability and availability features turn into major design issues, especially in distributed computing environments. This paper proposes a highly available, scalable and secure distributed data storage system (HASS) for high performance and secure data management. Distributed and parallel data storage or file systems such as Object-based Storage

  2. Condition-based monitoring of an electro-hydraulic system using open software architectures

    Microsoft Academic Search

    Bala Chidambaram; Daniel D Gilbertson; Kirby Keller

    2005-01-01

    A Boeing-led industry consortium has developed open software standards for the condition-based monitoring of complex systems (http:\\/\\/www.osacbm.org). The software standards provide a layered approach to maintenance (the layers are data acquisition, data manipulation, condition-monitoring, health assessment, prognostics, decision support and user display) in a distributed computing environment. This paper describes an implementation of the standard - its application to the

  3. 6.824 Distributed Computer Systems, Fall 2002

    E-print Network

    Morris, Robert Tappan

    Abstractions and implementation techniques for design of distributed systems; server design, network programming, naming, storage systems, security, and fault tolerance. Readings from current literature. 6 Engineering ...

  4. Driven harmonic oscillator as a quantum simulator for open systems

    E-print Network

    Jyrki Piilo; Sabrina Maniscalco

    2006-10-03

    We show theoretically how a driven harmonic oscillator can be used as a quantum simulator for non-Markovian damped harmonic oscillator. In the general framework, the results demonstrate the possibility to use a closed system as a simulator for open quantum systems. The quantum simulator is based on sets of controlled drives of the closed harmonic oscillator with appropriately tailored electric field pulses. The non-Markovian dynamics of the damped harmonic oscillator is obtained by using the information about the spectral density of the open system when averaging over the drives of the closed oscillator. We consider single trapped ions as a specific physical implementation of the simulator, and we show how the simulator approach reveals new physical insight into the open system dynamics, e.g. the characteristic quantum mechanical non-Markovian oscillatory behavior of the energy of the damped oscillator, usually obtained by the non-Lindblad-type master equation, can have a simple semiclassical interpretation.

  5. Driven harmonic oscillator as a quantum simulator for open systems

    E-print Network

    Piilo, J; Maniscalco, Sabrina; Piilo, Jyrki

    2006-01-01

    We show theoretically how a driven harmonic oscillator can be used as a quantum simulator for non-Markovian damped harmonic oscillator. In the general framework, the results demonstrate the possibility to use a closed system as a simulator for open quantum systems. The quantum simulator is based on sets of controlled drives of the closed harmonic oscillator with appropriately tailored electric field pulses. The non-Markovian dynamics of the damped harmonic oscillator is obtained by using the information about the spectral density of the open system when averaging over the drives of the closed oscillator. We consider single trapped ions as a specific physical implementation of the simulator, and we show how the simulator approach reveals new physical insight into the open system dynamics, e.g. the characteristic quantum mechanical non-Markovian oscillatory behavior of the energy of the damped oscillator, usually obtained by the non-Lindblad-type master equation, can have a simple semiclassical interpretation.

  6. Driven harmonic oscillator as a quantum simulator for open systems

    SciTech Connect

    Piilo, Jyrki; Maniscalco, Sabrina [Department of Physics, University of Turku, FI-20014 Turun yliopisto (Finland)

    2006-09-15

    We show theoretically how a driven harmonic oscillator can be used as a quantum simulator for the non-Markovian damped harmonic oscillator. In the general framework, our results demonstrate the possibility to use a closed system as a simulator for open quantum systems. The quantum simulator is based on sets of controlled drives of the closed harmonic oscillator with appropriately tailored electric field pulses. The non-Markovian dynamics of the damped harmonic oscillator is obtained by using the information about the spectral density of the open system when averaging over the drives of the closed oscillator. We consider single trapped ions as a specific physical implementation of the simulator, and we show how the simulator approach reveals physical insight into the open system dynamics, e.g., the characteristic quantum mechanical non-Markovian oscillatory behavior of the energy of the damped oscillator, usually obtained by the non-Lindblad-type master equation, can have a simple semiclassical interpretation.

  7. Optimization of open pit loading and hauling systems

    SciTech Connect

    Fytas, K.; Calder, P.N.

    1984-12-01

    PITSIM-II is a computer simulation package that optimizes and simulates open pit haulage systems. The computer model was created in a generalized form that allows the analysis of any open pit loading and hauling system. The main objective of the model is to aid mine management in designing the haulage system and selecting the optimum combination of mixed size trucks. It is also a valuable tool in assisting the mine operator to operate the fleet in an optimum way, in order to meet certain production and blending targets. The other objectives of the model is to aid short and long range production scheduling in terms of forecasting the expected production rates.

  8. Models and Feedback Stabilization of Open Quantum Systems

    E-print Network

    Pierre Rouchon

    2015-01-08

    At the quantum level, feedback-loops have to take into account measurement back-action. We present here the structure of the Markovian models including such back-action and sketch two stabilization methods: measurement-based feedback where an open quantum system is stabilized by a classical controller; coherent or autonomous feedback where a quantum system is stabilized by a quantum controller with decoherence (reservoir engineering). We begin to explain these models and methods for the photon box experiments realized in the group of Serge Haroche (Nobel Prize 2012). We present then these models and methods for general open quantum systems.

  9. Non-equilibrium thermodynamics approach to open quantum systems

    E-print Network

    Vitalii Semin; Francesco Petruccione

    2014-11-11

    Open quantum systems are studied from the thermodynamical point of view unifying the principle of maximum informational entropy and the hypothesis of relaxation times hierarchy. The result of the unification is a non-Markovian and local in time master equation that provides a direct connection of dynamical and thermodynamical properties of open quantum systems. The power of the approach is illustrated with the application to the damped harmonic oscillator and the damped driven two-level system resulting in analytical expressions for the non-Markovian and non-equilibrium entropy and inverse temperature.

  10. Nonequilibrium-thermodynamics approach to open quantum systems

    NASA Astrophysics Data System (ADS)

    Semin, Vitalii; Petruccione, Francesco

    2014-11-01

    Open quantum systems are studied from the thermodynamical point of view unifying the principle of maximum informational entropy and the hypothesis of relaxation times hierarchy. The result of the unification is a non-Markovian and local-in-time master equation that provides a direct connection for dynamical and thermodynamical properties of open quantum systems. The power of the approach is illustrated by the application to the damped harmonic oscillator and the damped driven two-level system, resulting in analytical expressions for the non-Markovian and nonequilibrium entropy and inverse temperature.

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

    DOEpatents

    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.

  12. Open space system study for the Dacca metropolitan area 

    E-print Network

    Rab, Wajeda Jafar

    1970-01-01

    and vegetation. The analytical facts were synthesized to socio-cultural image study, road system study, end finally, open space system study. These studies are based on existing and future physical, socio-cultural growth patterns. It was found out that the rivers...

  13. POSTER PRESENTATION Open Access Dynamics of neural systems in epilepsy

    E-print Network

    Paris-Sud XI, Université de

    POSTER PRESENTATION Open Access Dynamics of neural systems in epilepsy Kenza EL Houssaini* , Viktor 2013 Epilepsy is a nervous system disorder. It is characterized by a brain dysfunction activity in epilepsy. BMC Neuroscience 2013 14(Suppl 1):P124. * Correspondence: kenzaelhoussaini@hotmail.fr UMR 1106

  14. Control Landscapes for Observable Preparation with Open Quantum Systems

    E-print Network

    Rebing Wu; Alexander Pechen; Herschel Rabitz; Michael Hsieh; Benjamin Tsou

    2007-08-16

    A quantum control landscape is defined as the observable as a function(al) of the system control variables. Such landscapes were introduced to provide a basis to understand the increasing number of successful experiments controlling quantum dynamics phenomena. This paper extends the concept to encompass the broader context of the environment having an influence. For the case that the open system dynamics are fully controllable, it is shown that the control landscape for open systems can be lifted to the analysis of an equivalent auxiliary landscape of a closed composite system that contains the environmental interactions. This inherent connection can be analyzed to provide relevant information about the topology of the original open system landscape. Application to the optimization of an observable expectation value reveals the same landscape simplicity observed in former studies on closed systems. In particular, no false sub-optimal traps exist in the system control landscape when seeking to optimize an observable, even in the presence of complex environments. Moreover, a quantitative study of the control landscape of a system interacting with a thermal environment shows that the enhanced controllability attainable with open dynamics significantly broadens the range of the achievable observable values over the control landscape.

  15. Visitor face tracking system using OpenCV library

    Microsoft Academic Search

    Yong Kok Ching; A. S. Prabuwono; R. Sulaiman

    2009-01-01

    This paper presents the development of visitor face tracking system using OpenCV library. This system can be used for security purpose to record the visitor face. The user can identify who had been visiting him\\/her when away from the place. Visitors just need to appear in front of the web camera for at least 10 second, their image will be

  16. Privacy and Security in Open and Trusted Health Information Systems

    Microsoft Academic Search

    Vicky Liu; William Caelli; Tony Sahama

    The Open and Trusted Health Information Systems (OTHIS) Research Group has formed in response to the health sector's privacy and security requirements for contemporary Health Information Systems (HIS). Due to recent research developments in trusted computing concepts, it is now both timely and desirable to move electronic HIS towards privacy-aware and security-aware applications. We introduce the OTHIS architecture in this

  17. Decision support system for open-pit lignite mining areas

    Microsoft Academic Search

    S. KADEN; L MICHELS; K. TDEMER

    1990-01-01

    Open-pit lignite mining has severe impacts on water resources systems. In the German Democratic Republic (GDR), for example, the amount of mine drainage water pumped by about 7000 dewatering wells exceeds 20% of the stable runoff of the whole country. A computerized decision support system (DSS) can be an efficient tool for the analysis of complicated water use problems in

  18. Greenstone: A Comprehensive Open-Source Digital Library Software System

    Microsoft Academic Search

    Ian H. Witten; Rodger J. McNab; Stefan J. Boddie; David Bainbridge

    1999-01-01

    This paper describes the Greenstone digital library software, a comprehensive, open-source system for the construction and presentation of information collections. Collections built with Greenstone offer effective full-text searching and metadata-based browsing facilities that are attractive and easy to use. Moreover, they are easily maintainable and can be augmented and rebuilt entirely automatically. The system is extensible: software \\

  19. Greenstone: a comprehensive open-source digital library software system

    Microsoft Academic Search

    Ian H. Witten; Stefan J. Boddie; David Bainbridge; Rodger J. McNab

    2000-01-01

    This paper describes the Greenstone digital library software, a comprehensive, open-source system for the construction and presentation of information collections. Collections built with Greenstone offer effective full-text searching and metadata-based browsing facilities that are attractive and easy to use. Moreover, they are easily maintainable and can be augmented and rebuilt entirely automatically. The system is extensible: software \\

  20. Performance debugging for distributed systems of black boxes

    Microsoft Academic Search

    Marcos Kawazoe Aguilera; Jeffrey C. Mogul; Janet L. Wiener; Patrick Reynolds; Athicha Muthitacharoen

    2003-01-01

    Many interesting large-scale systems are distributed systems of multiple communicating components. Such systems can be very hard to debug, especially when they exhibit poor performance. The problem becomes much harder when systems are composed of \\

  1. A completely open source based computing system for computer generation of Fourier holograms

    NASA Astrophysics Data System (ADS)

    Jackin, B. J.; Palanisamy, P. K.

    2009-10-01

    Computer generated holograms are usually generated using commercial software like MATLAB, MATHCAD, Mathematica, etc. This work is an approach in doing the same using freely distributed open source packages and Operating System. A Fourier hologram is generated using this method and tested for simulated and optical reconstruction. The reconstructed images are in good agreement with the objects chosen. The significance of using such a system is also discussed. Program summaryProgram title: FHOLO Catalogue identifier: AEDS_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEDS_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 176 336 No. of bytes in distributed program, including test data, etc.: 4 294 872 Distribution format: tar.gz Programming language: C++ Computer: any X86 micro computer Operating system: Linux (Debian Etch) RAM: 512 MB Classification: 18 Nature of problem: To generate a Fourier Hologram in micro computer only by using open source operating system and packages. Running time: Depends on the matrix size. 10 sec for a matrix of size 256×256.

  2. Model reference active optimal distributed tracking system for the linear distributed parameter systems

    Microsoft Academic Search

    Allen Moshfegh

    1994-01-01

    This paper presents a technique for designing an active optimal tracking system for control of a linear distributed parameter process for applications where precise tracking of the commanded trajectories or a reference model is required. Its dynamic performance is quite satisfactory where the boundary conditions are either unpredictable or the primary cause of the instability. The type of processes considered

  3. Detection of contamination of municipal water distribution systems

    DOEpatents

    Cooper, John F. (Oakland, CA)

    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.

  4. ADEPTS: Adaptive Intrusion Containment in Distributed Service Environments Distributed systems with multiple interacting services, such as distributed e-commerce systems, are suitable targets for

    E-print Network

    Bagchi, Saurabh

    systems with multiple interacting services, such as distributed e-commerce systems, are suitable targets that in guiding future choices. ADEPTS is demonstrated on a distributed e- commerce system and evaluated using: automated intrusion response, intrusion containment, e-commerce system, survivability, distributed services

  5. Instantaneous magnetic field distribution in brushless permanent magnet DC motors. I. Open-circuit field

    Microsoft Academic Search

    Z. Q. Zhu; David Howe; Ekkehard Bolte; Bemd Ackermann

    1993-01-01

    An analytical technique for predicting the instantaneous magnetic field distribution in the airgap region of radial-field topologies of brushless permanent-magnet DC motors, under any specified load condition and accounting implicitly for the stator winding current waveform and the effect of stator-slot-openings, has been developed. It is based on the superposition of the component fields due to the permanent magnet and

  6. Study on G-M type pulse tube cryocooler with a novel active gas distribution system

    NASA Astrophysics Data System (ADS)

    Qiu, L. M.; Wang, C.; Gan, Zhihua; Dong, W. Q.

    2012-06-01

    In order to overcome the disadvantages of a traditional gas distribution system of G-M type pulse tube cryocoolers, a novel active gas distribution system with a middle stage reservoir is proposed. Different from the traditional intake and exhaust processes, the refrigeration cycle with the active gas distribution system consists of an intake process from the middle stage reservoir, an intake process from the compressor, an exhaust process to the middle stage reservoir and an exhaust process to the compressor. Theoretical analysis shows that the active distribution system may significantly reduce the power consumption of the compressor due to the reduction of irreversible losses during the intake and exhaust processes. The self-made pulse tube cooler with the active gas distribution system was tested. Experimental results show that the active gas distribution system decreases the power consumption by 27% and entropy generation by 37% when the proportion of opening time of the middle stage reservoir is 30%. The cryocooler reaches a lower refrigeration temperature with minor decrease of cooling power. Besides, the active gas distribution system may increase the life time for valves.

  7. Energy Efficiency of Distributed Environmental Control Systems

    SciTech Connect

    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’s thermal dissatisfaction below a given threshold. The DECS energy usage was calculated using the simplified thermal model. OSFA control; providing a uniform temperature to the entire building, and occupant-selected HIYW control with a thermostat at each workstation were implemented for 3 cities representing 3 different climatic regions and control scenarios. It is shown that optimization allows DECS to deliver a higher level of individual and population thermal comfort while achieving annual energy savings between 14 and 26% compared to OSFA. The optimization model also allowed us to study the influence of the partitions’ thermal resistance and the variability of internal loads at each office. These influences didn’t make significant changes in the optimized energy consumption relative to OSFA. The results show that it is possible to provide thermal comfort for each occupant while saving energy compared to OSFA Furthermore, to simplify the implementation of this approach, a fuzzy logic system has been developed to generalize the overall optimization strategy. Its performance was almost as good as the gradient system. The fuzzy system provided thermal comfort to each occupant and saved energy compared to OSFA. The energy savings of the fuzzy system were not as high as for the gradient-optimized system, but the fuzzy system avoided complete connectivity, and the optimization did not have to be repeated for each population. 3. We employed a detailed CFD model of adjacent occupied cubicles to extend the thermal-circuit model in three significant ways: (a) relax the “office wall” requirement by allowing energy to flow between zones via advection as well as conduction, (b) improve the comfort model to account both for radiation as well as convection heat transfer, and (c) support ventilation systems in which the temperature is stratified, such as in underfloor air distribution systems. Initially, three-dimensional CFD simulations of several cubicle configurations, with an adjoining corridor, were performed both to understand the advection between cubicles and the

  8. Clock distribution system for digital computers

    DOEpatents

    Wyman, Robert H. (Brentwood, CA); Loomis, Jr., Herschel H. (Davis, CA)

    1981-01-01

    Apparatus for eliminating, in each clock distribution amplifier of a clock distribution system, sequential pulse catch-up error due to one pulse "overtaking" a prior clock pulse. The apparatus includes timing means to produce a periodic electromagnetic signal with a fundamental frequency having a fundamental frequency component V'.sub.01 (t); an array of N signal characteristic detector means, with detector means No. 1 receiving the timing means signal and producing a change-of-state signal V.sub.1 (t) in response to receipt of a signal above a predetermined threshold; N substantially identical filter means, one filter means being operatively associated with each detector means, for receiving the change-of-state signal V.sub.n (t) and producing a modified change-of-state signal V'.sub.n (t) (n=1, . . . , N) having a fundamental frequency component that is substantially proportional to V'.sub.01 (t-.theta..sub.n (t) with a cumulative phase shift .theta..sub.n (t) having a time derivative that may be made uniformly and arbitrarily small; and with the detector means n+1 (1.ltoreq.n

  9. DisTec: Towards a Distributed System for Telecom Computing

    NASA Astrophysics Data System (ADS)

    Yang, Shengqi; Wang, Bai; Zhao, Haizhou; Gao, Yuan; Wu, Bin

    The continued exponential growth in both the volume and the complexity of information, compared with the computing capacity of the silicon-based devices restricted by Moore's Law, is giving birth to a new challenge to the specific requirements of analysts, researchers and intelligence providers. With respect to this challenge, a new class of techniques and computing platforms, such as Map-Reduce model, which mainly focus on scalability and parallelism, has been emerging. In this paper, to move the scientific prototype forward to practice, we elaborate a prototype of our applied distributed system, DisTec, for knowledge discovery from social network perspective in the field of telecommunications. The major infrastructure is constructed on Hadoop, an open-source counterpart of Google's Map-Reduce. We carefully devised our system to undertake the mining tasks in terabytes call records. To illustrate its functionality, DisTec is applied to real-world large-scale telecom dataset. The experiments range from initial raw data preprocessing to final knowledge extraction. We demonstrate that our system has a good performance in such cloud-scale data computing.

  10. Fault-tolerant power distribution system

    NASA Technical Reports Server (NTRS)

    Volp, Jeffrey A. (Inventor)

    1987-01-01

    A fault-tolerant power distribution system which includes a plurality of power sources and a plurality of nodes responsive thereto for supplying power to one or more loads associated with each node. Each node includes a plurality of switching circuits, each of which preferably uses a power field effect transistor which provides a diode operation when power is first applied to the nodes and which thereafter provides bi-directional current flow through the switching circuit in a manner such that a low voltage drop is produced in each direction. Each switching circuit includes circuitry for disabling the power field effect transistor when the current in the switching circuit exceeds a preselected value.

  11. The Hazards Data Distribution System update

    USGS Publications Warehouse

    Jones, Brenda K.; Lamb, Rynn

    2010-01-01

    After a major disaster, a satellite image or a collection of aerial photographs of the event is frequently the fastest, most effective way to determine its scope and severity. The U.S. Geological Survey (USGS) Emergency Operations Portal provides emergency first responders and support personnel with easy access to imagery and geospatial data, geospatial Web services, and a digital library focused on emergency operations. Imagery and geospatial data are accessed through the Hazards Data Distribution System (HDDS). HDDS historically provided data access and delivery services through nongraphical interfaces that allow emergency response personnel to select and obtain pre-event baseline data and (or) event/disaster response data. First responders are able to access full-resolution GeoTIFF images or JPEG images at medium- and low-quality compressions through ftp downloads. USGS HDDS home page: http://hdds.usgs.gov/hdds2/

  12. Smart grid power system control in distributed generation environment

    Microsoft Academic Search

    Pertti Järventausta; Sami Repo; Antti Rautiainen; Jarmo Partanen

    2010-01-01

    This paper discusses the general aspects of smart grids and focuses on some distribution level smart grid features, such as interconnection of distributed generation and active distribution management, using automated meter reading (AMR) systems in network management and power quality monitoring, application of power electronics in electricity distribution, plug-in vehicles as part of smart grids, and frequency based load control

  13. Distribution system reliability assessment due to lightning storms

    Microsoft Academic Search

    Nagaraj Balijepalli; Subrahmanyam S. Venkata; Charles W. Richter; Richard D. Christie; Vito J. Longo

    2005-01-01

    Lightning is a significant cause of faults and outages in many electric power systems and is one of the major causes of poor system reliability. Predictive assessment of distribution reliability indices can be used to identify areas that have poor reliability so that appropriate changes in system design can be implemented. The assessment of distribution system performance under lightning conditions

  14. The Information Bus: an architecture for extensible distributed systems

    Microsoft Academic Search

    Brian Oki; Manfred Pfluegl; Alex Siegel; Dale Skeen

    1994-01-01

    Research can rarely be performed on large-scale, distributed systems at the level of thousands of workstations. In this paper, we describe the motivating constraints, design principles, and architecture for an extensible, distributed system operating in such an environment. The constraints include continuous operation, dynamic system evolution, and integration with extant systems. The , our solution, is a novel synthesis of

  15. DCS: A Distributed Coordinate System for Network Positioning

    E-print Network

    Ottawa, University of

    DCS: A Distributed Coordinate System for Network Positioning Negar Hariri1 , Jafar Habibi1 system. This article proposes the Decentralized Coordinate System (DCS) as a fully distributed system that does not rely on any infrastructure support from the underlying network. DCS uses a two-phase algorithm

  16. Distributed Visual-Target-Surveillance System in Wireless Sensor Networks

    Microsoft Academic Search

    Xue Wang; Sheng Wang; Daowei Bi

    2009-01-01

    A wireless sensor network (WSN) is a powerful unattended distributed measurement system, which is widely used in target surveillance because of its outstanding performance in distributed sensing and signal processing. This paper introduces a multiview visual-target-surveillance system in WSN, which can autonomously implement target classification and tracking with collaborative online learning and localization. The proposed system is a hybrid system

  17. A Distributed Synchronization and Timing System on the EAST Tokamak

    Microsoft Academic Search

    Jiarong Luo; Yichun Wu; Yantai Shu

    2008-01-01

    A key requirement for the EAST distributed control system (EASTDCS) is time synchronization to an accuracy of <1 mus. In 2006 a Distributed Synchronization and Timing System (DSTS) was set up, which is based on the ATmega128 AVR microcontroller and the Nut\\/OS embedded Real Time Operating System (RTOS). The DSTS provides the control and the data acquisition systems with reference

  18. Managing Uncertainty in Operational Control of Water Distribution Systems

    Microsoft Academic Search

    A. Bargiela

    Operation of water distribution systems requires a variety of decisions to be made. There are system development decisions: where, when and what new elements of the distribution system need to be built. There are system management decisions concerning the regulatory measures such as water pricing principles, effluent standards, legislative measures etc.. There are operational decisions determining such things as water

  19. The Information Bus - An Architecture for Extensible Distributed Systems

    Microsoft Academic Search

    Brian M. Oki; Manfred Pfluegl; Alex Siegel; Dale Skeen

    1993-01-01

    Research can rarely be performed on large-scale, distributed systems at the level of thousands of workstations. In this paper, we describe the motivating constraints, design principles, and architecture for an extensible, distributed system operating in such an environment. The constraints include continuous operation, dynamic system evolution, and integration with extant systems. The , our solution, is a novel synthesis of

  20. Freight distribution systems with cross-docking: a multidisciplinary analysis

    E-print Network

    -Feliu and Morana, 2010). · Logistic systems for urban freight distribution have also evolved into multi1 Freight distribution systems with cross-docking: a multidisciplinary analysis Jesus Gonzalez-echelon distribution is one of the most common strategies adopted by the transport companies in an aim of cost

  1. Applying laminated busbars to enhance DC power distribution systems

    Microsoft Academic Search

    M. Stibgen

    2004-01-01

    The intent of this paper will be an overview of how to design and implement laminated busbars into DC power distribution systems. It will include; electrical, physical and thermal characteristics obtained by utilizing a laminated busbar for DC power distribution. The power density of today's technology requires the power distribution system to play an active role in compacting size while

  2. A model system for examining the radial distribution function

    Microsoft Academic Search

    K. Younge; C. Christenson; A. Bohara; J. Crnkovic; P. Saulnier

    2004-01-01

    The radial distribution function provides a means of characterizing an amorphous material and is a measure of the spatial distribution of a system of particles. We introduce an experiment suitable for the undergraduate laboratory that illustrates the meaning and application of the radial distribution function to a two-dimensional system of hard spheres comprised of varying area fractions. Larger area fractions

  3. CCSP-A Formal System for Distributed Program Debugging

    Microsoft Academic Search

    Hanan Lutfiyya; Bruce Millin

    One major problem with programming in a parallel\\/distributed environmentis the difficulty in debugging the programs owing to the complex interactionsof their component processes. Complete knowledge of the program'sstate is not generally attainable in a distributed system. This paper presents adistributed system for debugging distributed programs that allows for the executionand evaluation of embedded assertions expressed in Hoare's CSP [6]. Weshow

  4. CSE 480: Distributed and RealTime Systems Spring 1996

    E-print Network

    Plotkin, Joshua B.

    1 CSE 480: Distributed and Real­Time Systems Spring 1996 Instructor: Insup Lee Time: 12:00 ­ 1 by a communication network has motivated the development of numerous concepts and paradigms for distributed systems. The primary objectives of this course are to study the principles and concepts of distributed computing

  5. OPTIMAL SCHEDULING OF BOOSTER DISINFECTION IN WATER DISTRIBUTION SYSTEMS

    EPA Science Inventory

    Booster disinfection is the addition of disinfectant at locations distributed throughout a water distribution system. Such a strategy can reduce the mass of disinfectant required to maintain a detectable residual at points of consumption in the distribution system, which may lea...

  6. A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations 

    E-print Network

    Ituzaro, Fred Agyekum

    2012-07-16

    Smart radial distribution grids will include advanced metering infrastructure (AMI) and significant distributed generators (DGs) connected close to loads. DGs in these radial distribution systems (RDS) introduce bidirectional ...

  7. Complex network analysis of water distribution systems

    E-print Network

    A. Yazdani; P. Jeffrey

    2011-04-01

    This paper explores a variety of strategies for understanding the formation, structure, efficiency and vulnerability of water distribution networks. Water supply systems are studied as spatially organized networks for which the practical applications of abstract evaluation methods are critically evaluated. Empirical data from benchmark networks are used to study the interplay between network structure and operational efficiency, reliability and robustness. Structural measurements are undertaken to quantify properties such as redundancy and optimal-connectivity, herein proposed as constraints in network design optimization problems. The role of the supply-demand structure towards system efficiency is studied and an assessment of the vulnerability to failures based on the disconnection of nodes from the source(s) is undertaken. The absence of conventional degree-based hubs (observed through uncorrelated non-heterogeneous sparse topologies) prompts an alternative approach to studying structural vulnerability based on the identification of network cut-sets and optimal connectivity invariants. A discussion on the scope, limitations and possible future directions of this research is provided.

  8. Characterizing and Improving Distributed Intrusion Detection Systems.

    SciTech Connect

    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.

  9. Distributed fiber optic fuel leak detection system

    NASA Astrophysics Data System (ADS)

    Mendoza, Edgar; Kempen, C.; Esterkin, Yan; Sun, Sonjian

    2013-05-01

    With the increase worldwide demand for hydrocarbon fuels and the vast development of new fuel production and delivery infrastructure installations around the world, there is a growing need for reliable fuel leak detection technologies to provide safety and reduce environmental risks. Hydrocarbon leaks (gas or liquid) pose an extreme danger and need to be detected very quickly to avoid potential disasters. Gas leaks have the greatest potential for causing damage due to the explosion risk from the dispersion of gas clouds. This paper describes progress towards the development of a fast response, high sensitivity, distributed fiber optic fuel leak detection (HySenseTM) system based on the use of an optical fiber that uses a hydrocarbon sensitive fluorescent coating to detect the presence of fuel leaks present in close proximity along the length of the sensor fiber. The HySenseTM system operates in two modes, leak detection and leak localization, and will trigger an alarm within seconds of exposure contact. The fast and accurate response of the sensor provides reliable fluid leak detection for pipelines, tanks, airports, pumps, and valves to detect and minimize any potential catastrophic damage.

  10. Distributed fiber optic fuel leak detection system

    NASA Astrophysics Data System (ADS)

    Mendoza, Edgar; Kempen, C.; Esterkin, Yan; Sun, Sunjian

    2013-05-01

    With the increase worldwide demand for hydrocarbon fuels and the vast development of new fuel production and delivery infrastructure installations around the world, there is a growing need for reliable fuel leak detection technologies to provide safety and reduce environmental risks. Hydrocarbon leaks (gas or liquid) pose an extreme danger and need to be detected very quickly to avoid potential disasters. Gas leaks have the greatest potential for causing damage due to the explosion risk from the dispersion of gas clouds. This paper describes progress towards the development of a fast response, high sensitivity, distributed fiber optic fuel leak detection (HySensTM) system based on the use of an optical fiber that uses a hydrocarbon sensitive fluorescent coating to detect the presence of fuel leaks present in close proximity along the length of the sensor fiber. The HySenseTM system operates in two modes, leak detection and leak localization, and will trigger an alarm within seconds of exposure contact. The fast and accurate response of the sensor provides reliable fluid leak detection for pipelines, tanks, airports, pumps, and valves to detect and minimize any potential catastrophic damage.

  11. ``Smart`` infrared thermography for distribution systems

    SciTech Connect

    Mader, D.L. [Ontario Hydro Technologies, Toronto, Ontario (Canada)

    1995-12-31

    Infrared surveys for municipal electric-power distribution systems, which are often built underground and which use different components from the bulk power system, require a portable and ``smart`` infrared instrument. In methodology development, the authors have focused on load-break elbows, which are designed to literally unplug the power to a shopping mall or a residential neighborhood. Load-break elbows contain metal conductors inside a thick layer of rubber or plastic insulation. The insulation is used for electrical isolation, but it also has thermal insulation properties. Because of the thermal insulation, temperature measured on the surface by an infrared camera need to be transformed into internal temperatures in order to assess the interior condition of the component. Heat conducted into the elbow from the transformer it is mounted on is one of several effects that they have taken into account by mathematical modelling. In this way one can tell if a hot spot adjacent to the transformer is caused by the transformer or by a poor electrical contact inside the elbow. The author has pioneered pattern recognition on the thermal profile scanned along the center-line of an elbow to assess its condition.

  12. An Analysis of Fifth-Grade Students' Performance When Solving Selected Open Distributive Sentences. Technical Report No. 397.

    ERIC Educational Resources Information Center

    Hobbs, Charles Eugene

    The author investigates elementary school students' performance when solving selected open distributive sentences in relation to three factors (Open Sentence Type, Context, Number Size) and identifies and classifies solution methods attempted by students and students' errors in performance. Eighty fifth-grade students participated in the…

  13. Audit considerations in distributed processing systems

    Microsoft Academic Search

    James V. Hansen

    1983-01-01

    Applications of distributed processing networks are proliferating rapidly. It is expected that by the year 2000, distributed networks will be one of the most significant developments to evolve from the computer revolution.Distributed networks are unique in that they bring together concepts of communication, engineering, and computing. From an audit standpoint, the complexities involved in control design and testing are challenging.

  14. 46 CFR 183.376 - Grounded distribution systems (neutral grounded).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Each propulsion, power, lighting, or distribution...neutral of each grounded generation and distribution...neutral of an emergency power generation system must be grounded...No switch, circuit breaker, or fuse in the...

  15. 46 CFR 120.376 - Grounded distribution systems (Neutral grounded).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Each propulsion, power, lighting, or distribution...neutral or each grounded generation and distribution...neutral of an emergency power generation system must be grounded...No switch, circuit breaker, or fuse in the...

  16. 46 CFR 120.376 - Grounded distribution systems (Neutral grounded).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Each propulsion, power, lighting, or distribution...neutral or each grounded generation and distribution...neutral of an emergency power generation system must be grounded...No switch, circuit breaker, or fuse in the...

  17. 46 CFR 183.376 - Grounded distribution systems (neutral grounded).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Each propulsion, power, lighting, or distribution...neutral of each grounded generation and distribution...neutral of an emergency power generation system must be grounded...No switch, circuit breaker, or fuse in the...

  18. Open Rotor Tone Shielding Methods for System Noise Assessments Using Multiple Databases

    NASA Technical Reports Server (NTRS)

    Bahr, Christopher J.; Thomas, Russell H.; Lopes, Leonard V.; Burley, Casey L.; Van Zante, Dale E.

    2014-01-01

    Advanced aircraft designs such as the hybrid wing body, in conjunction with open rotor engines, may allow for significant improvements in the environmental impact of aviation. System noise assessments allow for the prediction of the aircraft noise of such designs while they are still in the conceptual phase. Due to significant requirements of computational methods, these predictions still rely on experimental data to account for the interaction of the open rotor tones with the hybrid wing body airframe. Recently, multiple aircraft system noise assessments have been conducted for hybrid wing body designs with open rotor engines. These assessments utilized measured benchmark data from a Propulsion Airframe Aeroacoustic interaction effects test. The measured data demonstrated airframe shielding of open rotor tonal and broadband noise with legacy F7/A7 open rotor blades. Two methods are proposed for improving the use of these data on general open rotor designs in a system noise assessment. The first, direct difference, is a simple octave band subtraction which does not account for tone distribution within the rotor acoustic signal. The second, tone matching, is a higher-fidelity process incorporating additional physical aspects of the problem, where isolated rotor tones are matched by their directivity to determine tone-by-tone shielding. A case study is conducted with the two methods to assess how well each reproduces the measured data and identify the merits of each. Both methods perform similarly for system level results and successfully approach the experimental data for the case study. The tone matching method provides additional tools for assessing the quality of the match to the data set. Additionally, a potential path to improve the tone matching method is provided.

  19. Harmonic impact of different distributed generation units on low voltage distribution system

    Microsoft Academic Search

    A. F. Abdul Kadir; A. Mohamed; H. Shareef

    2011-01-01

    This paper is concerned with harmonic impact of different types of distributed generation (DG) units in low voltage distribution systems. This study considers the impact of three types of DG units connected to a power system, a mini hydro synchronous generator, photovoltaic system and double fed induction generator wind turbine. The DG units are modelled using the PSCAD\\/EMTDC program and

  20. An Open-System Quantum Simulator with Trapped Ions

    E-print Network

    Barreiro, Julio T; Schindler, Philipp; Nigg, Daniel; Monz, Thomas; Chwalla, Michael; Hennrich, Markus; Roos, Christian F; Zoller, Peter; Blatt, Rainer; 10.1038/nature09801

    2011-01-01

    The control of quantum systems is of fundamental scientific interest and promises powerful applications and technologies. Impressive progress has been achieved in isolating the systems from the environment and coherently controlling their dynamics, as demonstrated by the creation and manipulation of entanglement in various physical systems. However, for open quantum systems, engineering the dynamics of many particles by a controlled coupling to an environment remains largely unexplored. Here we report the first realization of a toolbox for simulating an open quantum system with up to five qubits. Using a quantum computing architecture with trapped ions, we combine multi-qubit gates with optical pumping to implement coherent operations and dissipative processes. We illustrate this engineering by the dissipative preparation of entangled states, the simulation of coherent many-body spin interactions and the quantum non-demolition measurement of multi-qubit observables. By adding controlled dissipation to coheren...

  1. Open Architecture Submarine Cable Observatory Systems

    Microsoft Academic Search

    N. J. Hazell; G. Waterworth; A. Lecroart

    2007-01-01

    The NEPTUNE observatory system has introduced a new technology approach, bringing the Internet to subsea cabled science observatory systems. The subsea nodes, providing subsea connection points provisioning data and power, provide a gateway between the permanent infrastructure and the instrumentation. The proven high reliability and long life of the subsea communications equipment offers the opportunity to install permanent observatories for

  2. Rutgers Student Alcohol Project: Open Systems Perspective.

    ERIC Educational Resources Information Center

    Crossman, Lenard H.

    1981-01-01

    Discusses systems theory applied to alcoholism programing which enables programers to analyze a project for maximum system effectiveness. It is suggested that generating scarce resources, especially clients, and having appropriate services, calls for extensive interorganizational linkages and for sensitive interaction with the environment. (Author)

  3. Probability Distributions and Hilbert Spaces: Quantum and Classical Systems

    E-print Network

    V. I. Man'ko; G. Marmo

    1999-03-04

    We use the fact that some linear Hamiltonian systems can be considered as ``finite level'' quantum systems, and the description of quantum mechanics in terms of probabilities, to associate probability distributions with this particular class of linear Hamiltonian systems.

  4. Concurrency control in a system for distributed databases (SDD1)

    Microsoft Academic Search

    Philip A. Bernstein; David W. Shipman; James B. Rothnie Jr.

    1980-01-01

    This paper presents the concurrency control strategy of SDD-1. SDD-1, a System for Distributed Databases, is a prototype distributed database system being developed by Computer Corporation of America. In SDD-1, portions of data distributed throughout a network may be replicated at multiple sites. The SDD-1 concurrency control guarantees database consistency in the face of such distribution and replication.This paper is

  5. Evolution Patterns of Open-Source Software Systems and Communities

    E-print Network

    Nakakoji, Kumiyo

    Evolution Patterns of Open-Source Software Systems and Communities Kumiyo Nakakoji1,2,3 Yasuhiro product evolution". To understand how this "natural product evolution" happens, we have conducted a case study of four typical OSS projects. Unlike most previous studies on software evolution that focus

  6. A Flexible, Open, Decentralized System for Digital Pathology Networks

    E-print Network

    Chervenak, Ann

    A Flexible, Open, Decentralized System for Digital Pathology Networks Robert SCHULERa,1 and David E and sharing of digitized microscopy slides and new methods for digital pathology. Collaborative research centers, outsourced medical services, and multi-site organizations stand to benefit from sharing pathology

  7. Correlates of Open and Closed Value Systems among University Students

    ERIC Educational Resources Information Center

    Duffy, Ryan D.; Sedlacek, William E.

    2006-01-01

    A sample of 3,484 incoming first-year students at a large, mid-Atlantic University were surveyed to assess a variety of attitudinal and behavioral variables pertinent to the college experience. The current study focused on how student value system orientation, or the degree to which values are open or closed, related to key aspects of college…

  8. A Petri Net Interpretation of Open Reconfigurable Systems

    E-print Network

    Boyer, Edmond

    . In the second case, a Petri net is built directly from the syntax. Most of the time, the semantic analysisA Petri Net Interpretation of Open Reconfigurable Systems Frédéric Peschanski1 , Hanna Klaudel2 present a Petri net interpretation of the pi-graphs - a graphical variant of the pi

  9. I-Living: An Open System Architecture for Assisted Living

    Microsoft Academic Search

    Qixin Wang; Wook Shin; Xue Liu; Zheng Zeng; Cham Oh; B. K. AlShebli; M. Caccamo; C. A. Gunter; E. Gunter; J. Hou; K. Karahalios; Lui Sha

    2006-01-01

    Advances in networking, sensors, and embedded devices have made it feasible to monitor and provide medical and other assistance to people in their homes. Aging populations will benefit from reduced costs and improved healthcare through assisted living based on these technologies. However, these systems challenge current state-of-the-art techniques for usability, reliability, and security. This is a particular challenge for open

  10. Fractal Weyl law behavior in an open, chaotic Hamiltonian system

    E-print Network

    Jordan A. Ramilowski; S. D. Prado; F. Borondo; David Farrelly

    2009-11-05

    We numerically show fractal Weyl law behavior in an open Hamiltonian system that is described by a smooth potential and which supports numerous above-barrier resonances. This behavior holds even relatively far away from the classical limit. The complex resonance wave functions are found to be localized on the fractal classical repeller.

  11. Evaluating the Evolution of Small Scale Open Source Software Systems

    E-print Network

    Cordy, James R.

    new features. This growth is accompanied by increasing complexity of the software. At a certain pointEvaluating the Evolution of Small Scale Open Source Software Systems Chanchal Kumar Roy and James R://www.cs.queensu.ca/~cordy Abstract. For real-world software to remain satisfactory to its stake- holders requires its continual

  12. Combustor for regenerative open cycle gas turbine system

    Microsoft Academic Search

    1984-01-01

    A counter flow combustor for regenerative open cycle turbine systems has an outer casing defining a head cavity at one end, an inner casing mounting in said outer casing, said inner casing defining a combustion chamber. An annular insulated partition and support means is connected at its upper end to the inner wall of the outer casing and at its

  13. Chinese Localisation of Evergreen: An Open Source Integrated Library System

    ERIC Educational Resources Information Center

    Zou, Qing; Liu, Guoying

    2009-01-01

    Purpose: The purpose of this paper is to investigate various issues related to Chinese language localisation in Evergreen, an open source integrated library system (ILS). Design/methodology/approach: A Simplified Chinese version of Evergreen was implemented and tested and various issues such as encoding, indexing, searching, and sorting…

  14. THE DISTRIBUTED OPEN SOURCE SOFTWARE DEVELOPMENT MODEL: OBSERVATIONS ON COMMUNICATION, COORDINATION AND CONTROL1

    Microsoft Academic Search

    Björn Lundell; Brian Lings; Pär J Ågerfalk; Brian Fitzgerald

    There are many reasons why an organisation should consider adopting distributed development of software systems and applications, including access to a larger labour pool and a broader skills base, cost advantages, and round the clock working. However, distributed development presents many challenges stemming from the complexity of maintaining good communication, coordination and control when teams are dispersed in time (e.g.

  15. Distributed open source control with Industrial Ethernet I\\/O devices

    Microsoft Academic Search

    Filip Andren; Thomas Strasser

    2011-01-01

    A trend towards the usage of distributed approaches in industrial automation can be observed during the last decade. The IEC 61499 standard was especially developed for such distributed applications in Industrial Process Measurement and Control Systems (IPMCS). Moreover, Industrial Ethernet becoming more and more popular and replacing step-by-step conventional field bus technology in IPMCS. Therefore, the main objective of this

  16. Downlink Performance and Capacity of Distributed Antenna Systems

    E-print Network

    Firouzabadi, Sina

    2011-01-01

    This paper investigates the performance of the downlink channel in distributed antenna systems. We first establish the ergodic capacity of distributed antennas, under different channel side information (CSI) assumptions. We consider a generalized distributed antenna system with $N$ distributed ports, each of which is equipped with an array of $L$ transmit antennas and constrained by a fixed transmit power. For this system we calculate the downlink capacity to a single antenna receiver, under different assumptions about the availability of the channel states at the transmitter. Having established this information theoretic analysis of the ergodic capacity of distributed antenna systems, this paper also investigates the effect of antenna placement on the performance of such systems. In particular, we investigate the optimal placement of the transmit antennas in distributed antenna systems. We present a fairly general framework for this optimization with no constraint on the location of the antennas. Based on st...

  17. RFID based production and distribution management systems for home appliance industry

    Microsoft Academic Search

    Xubing Chen; Yuhui Wang; Zhouping Yin

    2010-01-01

    The goal of the paper is to provide RFID based management methodologies for the production and distribution processes in the life cycle management of home appliances. Major hardware components and software functions of the process management systems are described as a combination case of closed-loop and open-loop applications. For the closed-loop application in factories, HF RFID tray tags, workstation readers

  18. Open Systems' Density Matrix Properties in a Time Coarsened Formalism

    NASA Astrophysics Data System (ADS)

    Englman, Robert; Yahalom, Asher

    2015-06-01

    The concept of time-coarsened density matrix for open systems has frequently featured in equilibrium and non-equilibrium statistical mechanics, without being probed as to the detailed consequences of the time averaging procedure. In this work we introduce and prove the need for a selective and non-uniform time-sampling, whose form depends on the properties (whether thermalized or not) of the bath. It is also applicable when an open microscopic sub-system is coupled to another finite system. By use of a time-periodic minimal coupling model between these two systems, we present detailed quantitative consequences of time coarsening, which include initial state independence of equilibration, deviations from long term averages, their environment size dependence and the approach to classicality, as measured by a Leggett-Garg type inequality. An interacting multiple qubit model affords comparison between the time integrating procedure and the more conventional environment tracing method.

  19. Dynamical invariants and nonadiabatic geometric phases in open quantum systems

    SciTech Connect

    Sarandy, M. S. [Departamento de Ciencias Exatas, Polo Universitario de Volta Redonda, Universidade Federal Fluminense, Avenida dos Trabalhadores 420, Volta Redonda, 27255-125 Rio de Janeiro (Brazil); Duzzioni, E. I. [Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, R. Santa Adelia 166, Santo Andre 09210-170, Sao Paulo (Brazil); Moussa, M. H. Y. [Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, Sao Carlos, 13560-970, Sao Paulo (Brazil)

    2007-11-15

    We introduce an operational framework to analyze nonadiabatic Abelian and non-Abelian, cyclic and noncyclic, geometric phases in open quantum systems. In order to remove the adiabaticity condition, we generalize the theory of dynamical invariants to the context of open systems evolving under arbitrary convolutionless master equations. Geometric phases are then defined through the Jordan canonical form of the dynamical invariant associated with the superoperator that governs the master equation. As a by-product, we provide a sufficient condition for the robustness of the phase against a given decohering process. We illustrate our results by considering a two-level system in a Markovian interaction with the environment, where we show that the nonadiabatic geometric phase acquired by the system can be constructed in such a way that it is robust against both dephasing and spontaneous emission.

  20. Open-frame system for single-molecule microscopy

    NASA Astrophysics Data System (ADS)

    Arsenault, Adriel; Leith, Jason S.; Henkin, Gil; McFaul, Christopher M. J.; Tarling, Matthew; Talbot, Richard; Berard, Daniel; Michaud, Francois; Scott, Shane; Leslie, Sabrina R.

    2015-03-01

    We present the design and construction of a versatile, open frame inverted microscope system for wide-field fluorescence and single molecule imaging. The microscope chassis and modular design allow for customization, expansion, and experimental flexibility. We present two components which are included with the microscope which extend its basic capabilities and together create a powerful microscopy system: A Convex Lens-induced Confinement device provides the system with single-molecule imaging capabilities, and a two-color imaging system provides the option of imaging multiple molecular species simultaneously. The flexibility of the open-framed chassis combined with accessible single-molecule, multi-species imaging technology supports a wide range of new measurements in the health, nanotechnology, and materials science research sectors.