Science.gov

Sample records for control communications computers

  1. Integrating Communication, Computer Access, Environmental Control & Mobility.

    ERIC Educational Resources Information Center

    Romich, Barry A.; Vagnini, Carol B.

    Severely physically disabled people can be helped to reach their goals in educational, vocational, and personal pursuits through appropriate use of current technology. The expressive communication needs of people without functional speech can be met through an analysis of selection techniques, processing, and outputs. Examples of new systems…

  2. Integrated command, control, communications and computation system functional architecture

    NASA Technical Reports Server (NTRS)

    Cooley, C. G.; Gilbert, L. E.

    1981-01-01

    The functional architecture for an integrated command, control, communications, and computation system applicable to the command and control portion of the NASA End-to-End Data. System is described including the downlink data processing and analysis functions required to support the uplink processes. The functional architecture is composed of four elements: (1) the functional hierarchy which provides the decomposition and allocation of the command and control functions to the system elements; (2) the key system features which summarize the major system capabilities; (3) the operational activity threads which illustrate the interrelationahip between the system elements; and (4) the interfaces which illustrate those elements that originate or generate data and those elements that use the data. The interfaces also provide a description of the data and the data utilization and access techniques.

  3. Computation and Communication Evaluation of an Authentication Mechanism for Time-Triggered Networked Control Systems.

    PubMed

    Martins, Goncalo; Moondra, Arul; Dubey, Abhishek; Bhattacharjee, Anirban; Koutsoukos, Xenofon D

    2016-01-01

    In modern networked control applications, confidentiality and integrity are important features to address in order to prevent against attacks. Moreover, network control systems are a fundamental part of the communication components of current cyber-physical systems (e.g., automotive communications). Many networked control systems employ Time-Triggered (TT) architectures that provide mechanisms enabling the exchange of precise and synchronous messages. TT systems have computation and communication constraints, and with the aim to enable secure communications in the network, it is important to evaluate the computational and communication overhead of implementing secure communication mechanisms. This paper presents a comprehensive analysis and evaluation of the effects of adding a Hash-based Message Authentication (HMAC) to TT networked control systems. The contributions of the paper include (1) the analysis and experimental validation of the communication overhead, as well as a scalability analysis that utilizes the experimental result for both wired and wireless platforms and (2) an experimental evaluation of the computational overhead of HMAC based on a kernel-level Linux implementation. An automotive application is used as an example, and the results show that it is feasible to implement a secure communication mechanism without interfering with the existing automotive controller execution times. The methods and results of the paper can be used for evaluating the performance impact of security mechanisms and, thus, for the design of secure wired and wireless TT networked control systems. PMID:27463718

  4. Integrated command, control, communication and computation system design study. Summary of tasks performed

    NASA Technical Reports Server (NTRS)

    1982-01-01

    A summary of tasks performed on an integrated command, control, communication, and computation system design study is given. The Tracking and Data Relay Satellite System command and control system study, an automated real-time operations study, and image processing work are discussed.

  5. A Multi-Vehicles, Wireless Testbed for Networked Control, Communications and Computing

    NASA Astrophysics Data System (ADS)

    Murray, Richard; Doyle, John; Effros, Michelle; Hickey, Jason; Low, Steven

    2002-03-01

    We have constructed a testbed consisting of 4 mobile vehicles (with 4 additional vehicles being completed), each with embedded computing and communications capability for use in testing new approaches for command and control across dynamic networks. The system is being used or is planned to be used for testing of a variety of communications-related technologies, including distributed command and control algorithms, dynamically reconfigurable network topologies, source coding for real-time transmission of data in lossy environments, and multi-network communications. A unique feature of the testbed is the use of vehicles that have second order dynamics. Requiring real-time feedback algorithms to stabilize the system while performing cooperative tasks. The testbed was constructed in the Caltech Vehicles Laboratory and consists of individual vehicles with PC-based computation and controls, and multiple communications devices (802.11 wireless Ethernet, Bluetooth, and infrared). The vehicles are freely moving, wheeled platforms propelled by high performance dotted fairs. The room contains an access points for an 802.11 network, overhead visual sensing (to allow emulation of CI'S signal processing), a centralized computer for emulating certain distributed computations, and network gateways to control and manipulate communications traffic.

  6. Communication, Control, and Computer Access for Disabled and Elderly Individuals. ResourceBook 1: Communication Aids. Rehab/Education Technology ResourceBook Series.

    ERIC Educational Resources Information Center

    Brandenburg, Sara A., Ed.; Vanderheiden, Gregg C., Ed.

    One of a series of three resource guides concerned with communication, control, and computer access for disabled and elderly individuals, the directory focuses on communication aids. The book's six chapters each cover products with the same primary function. Cross reference indexes allow access to listings of products by function, input/output…

  7. Hyperswitch Communication Network Computer

    NASA Technical Reports Server (NTRS)

    Peterson, John C.; Chow, Edward T.; Priel, Moshe; Upchurch, Edwin T.

    1993-01-01

    Hyperswitch Communications Network (HCN) computer is prototype multiple-processor computer being developed. Incorporates improved version of hyperswitch communication network described in "Hyperswitch Network For Hypercube Computer" (NPO-16905). Designed to support high-level software and expansion of itself. HCN computer is message-passing, multiple-instruction/multiple-data computer offering significant advantages over older single-processor and bus-based multiple-processor computers, with respect to price/performance ratio, reliability, availability, and manufacturing. Design of HCN operating-system software provides flexible computing environment accommodating both parallel and distributed processing. Also achieves balance among following competing factors; performance in processing and communications, ease of use, and tolerance of (and recovery from) faults.

  8. Static dataflow computer with a plurality of control structures simultaneously and continuously monitoring first and second communication channels

    SciTech Connect

    Sterling, T.L.; Chan, E.Y.

    1990-10-16

    This patent describes a data processing system. It comprises: a functional computation unit in which data processing operations are executed on operand data in accordance with an opcode supplied thereto, so as to produce output data representative of the result of the execution of a data processing operation; a storage unit; a first communications channel; a second communications channel; and a control unit.

  9. Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems

    SciTech Connect

    Bajura, Richard; Feliachi, Ali

    2008-09-24

    Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and communication, agent technology, and power systems engineering in the development of intelligent control agents for reliable and automated operation of integrated electric power systems. In the event of scheduled load changes or unforeseen disturbances, the power system is expected to minimize the effects and costs of disturbances and to maintain critical infrastructure operational.

  10. Notebook Computers Increase Communication.

    ERIC Educational Resources Information Center

    Carey, Doris M.; Sale, Paul

    1994-01-01

    Project FIT (Full Inclusion through Technology) provides notebook computers for children with severe disabilities. The computers offer many input and output options. Assessing the students' equipment needs is a complex process, requiring determination of communication goals and baseline abilities, and consideration of equipment features such as…

  11. Convergence: Computing and communications

    SciTech Connect

    Catlett, C.

    1996-12-31

    This paper highlights the operations of the National Center for Supercomputing Applications (NCSA). NCSA is developing and implementing a national strategy to create, use, and transfer advanced computing and communication tools and information technologies for science, engineering, education, and business. The primary focus of the presentation is historical and expected growth in the computing capacity, personal computer performance, and Internet and WorldWide Web sites. Data are presented to show changes over the past 10 to 20 years in these areas. 5 figs., 4 tabs.

  12. Intentional Communication: Computationally Easy or Difficult?

    PubMed Central

    van Rooij, Iris; Kwisthout, Johan; Blokpoel, Mark; Szymanik, Jakub; Wareham, Todd; Toni, Ivan

    2011-01-01

    Human intentional communication is marked by its flexibility and context sensitivity. Hypothesized brain mechanisms can provide convincing and complete explanations of the human capacity for intentional communication only insofar as they can match the computational power required for displaying that capacity. It is thus of importance for cognitive neuroscience to know how computationally complex intentional communication actually is. Though the subject of considerable debate, the computational complexity of communication remains so far unknown. In this paper we defend the position that the computational complexity of communication is not a constant, as some views of communication seem to hold, but rather a function of situational factors. We present a methodology for studying and characterizing the computational complexity of communication under different situational constraints. We illustrate our methodology for a model of the problems solved by receivers and senders during a communicative exchange. This approach opens the way to a principled identification of putative model parameters that control cognitive processes supporting intentional communication. PMID:21747765

  13. Communication Capacity of Quantum Computation

    NASA Astrophysics Data System (ADS)

    Bose, S.; Rallan, L.; Vedral, V.

    2000-12-01

    By considering quantum computation as a communication process, we relate its efficiency to its classical communication capacity. This formalism allows us to derive lower bounds on the complexity of search algorithms in the most general context. It enables us to link the mixedness of a quantum computer to its efficiency and also allows us to derive the critical level of mixedness beyond which there is no quantum advantage in computation.

  14. Personal Computer Communications.

    ERIC Educational Resources Information Center

    Leclerc, Gerry

    The interconnection between personal computers and other personal, mini, or mainframe computer systems is discussed. The following topics relevant to college personnel are addressed: hardware techniques for tying computers together, advantages and disadvantages of available software, the prospects for sophisticated micro/mainframe links with major…

  15. Programmable data communications controller requirements

    NASA Technical Reports Server (NTRS)

    1977-01-01

    The design requirements for a Programmable Data Communications Controller (PDCC) that reduces the difficulties in attaching data terminal equipment to a computer are presented. The PDCC is an interface between the computer I/O channel and the bit serial communication lines. Each communication line is supported by a communication port that handles all line control functions and performs most terminal control functions. The port is fabricated on a printed circuit board that plugs into a card chassis, mating with a connector that is joined to all other card stations by a data bus. Ports are individually programmable; each includes a microprocessor, a programmable read-only memory for instruction storage, and a random access memory for data storage.

  16. Computer Communications and Learning.

    ERIC Educational Resources Information Center

    Bellman, Beryl L.

    1992-01-01

    Computer conferencing offers many opportunities for linking college students and faculty at a distance. From the Binational English and Spanish Telecommunications Network (BESTNET) has evolved a variety of bilingual video/computer/face-to-face instructional packages to serve institutions and nontraditional students on several continents. (MSE)

  17. Measurement of Computer Communication Networks.

    ERIC Educational Resources Information Center

    Abrams, Marshall D.; And Others

    Measures, tools, and techniques applicable to the performance measurement of computer communication networks are described for technicians who procure computer services from a remote access network. Cost considerations are discussed as a major component of evaluation, and measurement and evaluation methodologies are surveyed. External measurement…

  18. Computer Software for Process Control.

    ERIC Educational Resources Information Center

    Spector, Alfred Z.

    1984-01-01

    Computer software for process control has the primary function of communicating with and governing physical devices. The structure of such software, process-control systems, multitask systems, message passing, problems of deadlock, distributed computer systems, and protection against failure in process-control systems are among the areas examined.…

  19. The Use of Communication Strategies in Computer-Mediated Communication.

    ERIC Educational Resources Information Center

    Smith, Bryan

    2003-01-01

    Examines communication strategy use among adult learners of English in a computer-mediated environment. Specifically explored communication strategies employed during problem-free discourse as well as compensatory strategy use during task-based computer-mediated communication. Strategy use was also examined relative to communicative task type.…

  20. Communication, Control, and Computer Access for Disabled and Elderly Individuals. ResourceBook 3: Software and Hardware. Rehab/Education Technology ResourceBook Series.

    ERIC Educational Resources Information Center

    Brandenburg, Sara A., Ed.; Vanderheiden, Gregg C., Ed.

    One of a series of three resource guides concerned with communication, control, and computer access for the disabled or the elderly, the book focuses on hardware and software. The guide's 13 chapters each cover products with the same primary function. Cross reference indexes allow access to listings of products by function, input/output…

  1. Communication, Control, and Computer Access for Disabled and Elderly Individuals. ResourceBook 4: Update to Books 1, 2, and 3.

    ERIC Educational Resources Information Center

    Borden, Peter A., Ed.; Vanderheiden, Gregg C., Ed.

    This update to the three-volume first edition of the "Rehab/Education ResourceBook Series" describes special software and products pertaining to communication, control, and computer access, designed specifically for the needs of disabled and elderly people. The 22 chapters cover: speech aids; pointing and typing aids; training and communication…

  2. Internode data communications in a parallel computer

    DOEpatents

    Archer, Charles J.; Blocksome, Michael A.; Miller, Douglas R.; Parker, Jeffrey J.; Ratterman, Joseph D.; Smith, Brian E.

    2013-09-03

    Internode data communications in a parallel computer that includes compute nodes that each include main memory and a messaging unit, the messaging unit including computer memory and coupling compute nodes for data communications, in which, for each compute node at compute node boot time: a messaging unit allocates, in the messaging unit's computer memory, a predefined number of message buffers, each message buffer associated with a process to be initialized on the compute node; receives, prior to initialization of a particular process on the compute node, a data communications message intended for the particular process; and stores the data communications message in the message buffer associated with the particular process. Upon initialization of the particular process, the process establishes a messaging buffer in main memory of the compute node and copies the data communications message from the message buffer of the messaging unit into the message buffer of main memory.

  3. Internode data communications in a parallel computer

    DOEpatents

    Archer, Charles J; Blocksome, Michael A; Miller, Douglas R; Parker, Jeffrey J; Ratterman, Joseph D; Smith, Brian E

    2014-02-11

    Internode data communications in a parallel computer that includes compute nodes that each include main memory and a messaging unit, the messaging unit including computer memory and coupling compute nodes for data communications, in which, for each compute node at compute node boot time: a messaging unit allocates, in the messaging unit's computer memory, a predefined number of message buffers, each message buffer associated with a process to be initialized on the compute node; receives, prior to initialization of a particular process on the compute node, a data communications message intended for the particular process; and stores the data communications message in the message buffer associated with the particular process. Upon initialization of the particular process, the process establishes a messaging buffer in main memory of the compute node and copies the data communications message from the message buffer of the messaging unit into the message buffer of main memory.

  4. Computer-Aided Instruction and Communication Skills.

    ERIC Educational Resources Information Center

    Euler, Dieter

    1990-01-01

    Investigates effect of computer-aided instruction (CAI) on acquisition of communication skills. Sketches a tutorial of the basic communication structure. Recommends confining CAI to cognitive learning because CAI cannot advance communication skills. Maintains that integrating CAI in social arrangements will allow the computer to remain an…

  5. Computer-Mediated Communication and Shared Learning.

    ERIC Educational Resources Information Center

    Dicks, Dennis J.

    1992-01-01

    Discussion of computer-mediated communication focuses on techniques developed to help groups of people communicate effectively, including cooperative learning, team building, groupware for cooperative work, decision support systems, organizational design, and shared learning. Implications for the design of computer-mediated communication systems…

  6. High performance computing and communications program

    NASA Technical Reports Server (NTRS)

    Holcomb, Lee

    1992-01-01

    A review of the High Performance Computing and Communications (HPCC) program is provided in vugraph format. The goals and objectives of this federal program are as follows: extend U.S. leadership in high performance computing and computer communications; disseminate the technologies to speed innovation and to serve national goals; and spur gains in industrial competitiveness by making high performance computing integral to design and production.

  7. Integrating Computer-Mediated Communication Strategy Instruction

    ERIC Educational Resources Information Center

    McNeil, Levi

    2016-01-01

    Communication strategies (CSs) play important roles in resolving problematic second language interaction and facilitating language learning. While studies in face-to-face contexts demonstrate the benefits of communication strategy instruction (CSI), there have been few attempts to integrate computer-mediated communication and CSI. The study…

  8. Central Computational Facility CCF communications subsystem options

    NASA Technical Reports Server (NTRS)

    Hennigan, K. B.

    1979-01-01

    A MITRE study which investigated the communication options available to support both the remaining Central Computational Facility (CCF) computer systems and the proposed U1108 replacements is presented. The facilities utilized to link the remote user terminals with the CCF were analyzed and guidelines to provide more efficient communications were established.

  9. Intranode data communications in a parallel computer

    DOEpatents

    Archer, Charles J; Blocksome, Michael A; Miller, Douglas R; Ratterman, Joseph D; Smith, Brian E

    2013-07-23

    Intranode data communications in a parallel computer that includes compute nodes configured to execute processes, where the data communications include: allocating, upon initialization of a first process of a compute node, a region of shared memory; establishing, by the first process, a predefined number of message buffers, each message buffer associated with a process to be initialized on the compute node; sending, to a second process on the same compute node, a data communications message without determining whether the second process has been initialized, including storing the data communications message in the message buffer of the second process; and upon initialization of the second process: retrieving, by the second process, a pointer to the second process's message buffer; and retrieving, by the second process from the second process's message buffer in dependence upon the pointer, the data communications message sent by the first process.

  10. Intranode data communications in a parallel computer

    DOEpatents

    Archer, Charles J; Blocksome, Michael A; Miller, Douglas R; Ratterman, Joseph D; Smith, Brian E

    2014-01-07

    Intranode data communications in a parallel computer that includes compute nodes configured to execute processes, where the data communications include: allocating, upon initialization of a first process of a computer node, a region of shared memory; establishing, by the first process, a predefined number of message buffers, each message buffer associated with a process to be initialized on the compute node; sending, to a second process on the same compute node, a data communications message without determining whether the second process has been initialized, including storing the data communications message in the message buffer of the second process; and upon initialization of the second process: retrieving, by the second process, a pointer to the second process's message buffer; and retrieving, by the second process from the second process's message buffer in dependence upon the pointer, the data communications message sent by the first process.

  11. Modeling communication in cluster computing

    SciTech Connect

    Stoica, I.; Sultan, F.; Keyes, D.

    1995-12-01

    We introduce a model for communication costs in parallel processing environments, called the {open_quotes}hyperbolic model,{close_quotes} that generalizes two-parameter dedicated-link models in an analytically simple way. The communication system is modeled as a directed communication graph in which terminal nodes represent the application processes and internal nodes, called communication blocks (CBs), reflect the layered structure of the underlying communication architecture. A CB is characterized by a two-parameter hyperbolic function of the message size that represents the service time needed for processing the message. Rules are given for reducing a communication graph consisting of many CBs to an equivalent two-parameter form, while maintaining a good approximation for the service time. In [4] we demonstrate a tight fit of the estimates of the cost of communication based on our model with actual measurements of the communication and synchronization time between end processes. We, also show the compatibility of our model (to within a factor of 3/4) with the recently proposed LogP model.

  12. Brain-Computer Interfaces for Speech Communication

    PubMed Central

    Brumberg, Jonathan S.; Nieto-Castanon, Alfonso; Kennedy, Philip R.; Guenther, Frank H.

    2010-01-01

    This paper briefly reviews current silent speech methodologies for normal and disabled individuals. Current techniques utilizing electromyographic (EMG) recordings of vocal tract movements are useful for physically healthy individuals but fail for tetraplegic individuals who do not have accurate voluntary control over the speech articulators. Alternative methods utilizing EMG from other body parts (e.g., hand, arm, or facial muscles) or electroencephalography (EEG) can provide capable silent communication to severely paralyzed users, though current interfaces are extremely slow relative to normal conversation rates and require constant attention to a computer screen that provides visual feedback and/or cueing. We present a novel approach to the problem of silent speech via an intracortical microelectrode brain computer interface (BCI) to predict intended speech information directly from the activity of neurons involved in speech production. The predicted speech is synthesized and acoustically fed back to the user with a delay under 50 ms. We demonstrate that the Neurotrophic Electrode used in the BCI is capable of providing useful neural recordings for over 4 years, a necessary property for BCIs that need to remain viable over the lifespan of the user. Other design considerations include neural decoding techniques based on previous research involving BCIs for computer cursor or robotic arm control via prediction of intended movement kinematics from motor cortical signals in monkeys and humans. Initial results from a study of continuous speech production with instantaneous acoustic feedback show the BCI user was able to improve his control over an artificial speech synthesizer both within and across recording sessions. The success of this initial trial validates the potential of the intracortical microelectrode-based approach for providing a speech prosthesis that can allow much more rapid communication rates. PMID:20204164

  13. NOVANET: communications network for a control system

    SciTech Connect

    Hill, J.R.; Severyn, J.R.; VanArsdall, P.J.

    1983-05-23

    NOVANET is a control system oriented fiber optic local area network that was designed to meet the unique and often conflicting requirements of the Nova laser control system which will begin operation in 1984. The computers and data acquisition devices that form the distributed control system for a large laser fusion research facility need reliable, high speed communications. Both control/status messages and experimental data must be handled. A subset of NOVANET is currently operating on the two beam Novette laser system.

  14. Terminal-oriented computer-communication networks.

    NASA Technical Reports Server (NTRS)

    Schwartz, M.; Boorstyn, R. R.; Pickholtz, R. L.

    1972-01-01

    Four examples of currently operating computer-communication networks are described in this tutorial paper. They include the TYMNET network, the GE Information Services network, the NASDAQ over-the-counter stock-quotation system, and the Computer Sciences Infonet. These networks all use programmable concentrators for combining a multiplicity of terminals. Included in the discussion for each network is a description of the overall network structure, the handling and transmission of messages, communication requirements, routing and reliability consideration where applicable, operating data and design specifications where available, and unique design features in the area of computer communications.

  15. Computers, Remote Teleprocessing and Mass Communication.

    ERIC Educational Resources Information Center

    Cropley, A. J.

    Recent developments in computer technology are reducing the limitations of computers as mass communication devices. The growth of remote teleprocessing is one important step. Computers can now interact with users via terminals which may be hundreds of miles from the actual mainframe machine. Many terminals can be in operation at once, so that many…

  16. Educational Computer Utilization and Computer Communications.

    ERIC Educational Resources Information Center

    Singh, Jai P.; Morgan, Robert P.

    As part of an analysis of educational needs and telecommunications requirements for future educational satellite systems, three studies were carried out. 1) The role of the computer in education was examined and both current status and future requirements were analyzed. Trade-offs between remote time sharing and remote batch process were explored…

  17. Man/computer communication in a space environment

    NASA Technical Reports Server (NTRS)

    Hodges, B. C.; Montoya, G.

    1973-01-01

    The present work reports on a study of the technology required to advance the state of the art in man/machine communications. The study involved the development and demonstration of both hardware and software to effectively implement man/computer interactive channels of communication. While tactile and visual man/computer communications equipment are standard methods of interaction with machines, man's speech is a natural media for inquiry and control. As part of this study, a word recognition unit was developed capable of recognizing a minimum of one hundred different words or sentences in any one of the currently used conversational languages. The study has proven that efficiency in communication between man and computer can be achieved when the vocabulary to be used is structured in a manner compatible with the rigid communication requirements of the machine while at the same time responsive to the informational needs of the man.

  18. Distributed computing system with dual independent communications paths between computers and employing split tokens

    NASA Technical Reports Server (NTRS)

    Rasmussen, Robert D. (Inventor); Manning, Robert M. (Inventor); Lewis, Blair F. (Inventor); Bolotin, Gary S. (Inventor); Ward, Richard S. (Inventor)

    1990-01-01

    This is a distributed computing system providing flexible fault tolerance; ease of software design and concurrency specification; and dynamic balance of the loads. The system comprises a plurality of computers each having a first input/output interface and a second input/output interface for interfacing to communications networks each second input/output interface including a bypass for bypassing the associated computer. A global communications network interconnects the first input/output interfaces for providing each computer the ability to broadcast messages simultaneously to the remainder of the computers. A meshwork communications network interconnects the second input/output interfaces providing each computer with the ability to establish a communications link with another of the computers bypassing the remainder of computers. Each computer is controlled by a resident copy of a common operating system. Communications between respective ones of computers is by means of split tokens each having a moving first portion which is sent from computer to computer and a resident second portion which is disposed in the memory of at least one of computer and wherein the location of the second portion is part of the first portion. The split tokens represent both functions to be executed by the computers and data to be employed in the execution of the functions. The first input/output interfaces each include logic for detecting a collision between messages and for terminating the broadcasting of a message whereby collisions between messages are detected and avoided.

  19. Computers as Augmentative Communication Systems.

    ERIC Educational Resources Information Center

    Vanderheiden, Gregg C.

    The paper describes concepts and principles resulting in successful applications of computer technology to the needs of the disabled. The first part describes what a microcomputer is and is not, emphasizing the microcomputer as a machine that simply carries out instructions, the role of programming, and the use of prepared application programs.…

  20. Computing, Information and Communications Technology (CICT) Website

    NASA Technical Reports Server (NTRS)

    Hardman, John; Tu, Eugene (Technical Monitor)

    2002-01-01

    The Computing, Information and Communications Technology Program (CICT) was established in 2001 to ensure NASA's Continuing leadership in emerging technologies. It is a coordinated, Agency-wide effort to develop and deploy key enabling technologies for a broad range of mission-critical tasks. The NASA CICT program is designed to address Agency-specific computing, information, and communications technology requirements beyond the projected capabilities of commercially available solutions. The areas of technical focus have been chosen for their impact on NASA's missions, their national importance, and the technical challenge they provide to the Program. In order to meet its objectives, the CICT Program is organized into the following four technology focused projects: 1) Computing, Networking and Information Systems (CNIS); 2) Intelligent Systems (IS); 3) Space Communications (SC); 4) Information Technology Strategic Research (ITSR).

  1. Computer controlled antenna system

    NASA Technical Reports Server (NTRS)

    Raumann, N. A.

    1972-01-01

    The application of small computers using digital techniques for operating the servo and control system of large antennas is discussed. The advantages of the system are described. The techniques were evaluated with a forty foot antenna and the Sigma V computer. Programs have been completed which drive the antenna directly without the need for a servo amplifier, antenna position programmer or a scan generator.

  2. (CICT) Computing, Information, and Communications Technology Overview

    NASA Technical Reports Server (NTRS)

    VanDalsem, William R.

    2003-01-01

    The goal of the Computing, Information, and Communications Technology (CICT) program is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communications technologies. This viewgraph presentation includes diagrams of how the political guidance behind CICT is structured. The presentation profiles each part of the NASA Mission in detail, and relates the Mission to the activities of CICT. CICT's Integrated Capability Goal is illustrated, and hypothetical missions which could be enabled by CICT are profiled. CICT technology development is profiled.

  3. Optoelectronic Receiver For Communication And Control

    NASA Technical Reports Server (NTRS)

    Kunath, Richard; Bendett, Mark; Mactaggart, I. Ross

    1994-01-01

    Many operational and diagnostic features integrated into circuit chip. GaAs-based integrated circuit designed to serve as optoelectronic interface in phased-array antenna. Intended function to receive digital control signals transmitted on optical fiber and to convert signals to electronic control signals, which then applied to monolithic microwave integrated circuit (MMIC). Also used in reception of high-rate optical digital communications within computers, between computers, and in signal-distribution systems in aircraft, automobiles, and ships. Interface circuit represents significant improvement over preexisting interface circuits in that its clock-signal-recovery subcircuit requires little or no preamble for immediate synchronization.

  4. TMS communications hardware. Volume 1: Computer interfaces

    NASA Technical Reports Server (NTRS)

    Brown, J. S.; Weinrich, S. S.

    1979-01-01

    A prototpye coaxial cable bus communications system was designed to be used in the Trend Monitoring System (TMS) to connect intelligent graphics terminals (based around a Data General NOVA/3 computer) to a MODCOMP IV host minicomputer. The direct memory access (DMA) interfaces which were utilized for each of these computers are identified. It is shown that for the MODCOMP, an off-the-shell board was suitable, while for the NOVAs, custon interface circuitry was designed and implemented.

  5. Efficient communication in massively parallel computers

    SciTech Connect

    Cypher, R.E.

    1989-01-01

    A fundamental operation in parallel computation is sorting. Sorting is important not only because it is required by many algorithms, but also because it can be used to implement irregular, pointer-based communication. The author studies two algorithms for sorting in massively parallel computers. First, he examines Shellsort. Shellsort is a sorting algorithm that is based on a sequence of parameters called increments. Shellsort can be used to create a parallel sorting device known as a sorting network. Researchers have suggested that if the correct increment sequence is used, an optimal size sorting network can be obtained. All published increment sequences have been monotonically decreasing. He shows that no monotonically decreasing increment sequence will yield an optimal size sorting network. Second, he presents a sorting algorithm called Cubesort. Cubesort is the fastest known sorting algorithm for a variety of parallel computers aver a wide range of parameters. He also presents a paradigm for developing parallel algorithms that have efficient communication. The paradigm, called the data reduction paradigm, consists of using a divide-and-conquer strategy. Both the division and combination phases of the divide-and-conquer algorithm may require irregular, pointer-based communication between processors. However, the problem is divided so as to limit the amount of data that must be communicated. As a result the communication can be performed efficiently. He presents data reduction algorithms for the image component labeling problem, the closest pair problem and four versions of the parallel prefix problem.

  6. Computationally efficient control allocation

    NASA Technical Reports Server (NTRS)

    Durham, Wayne (Inventor)

    2001-01-01

    A computationally efficient method for calculating near-optimal solutions to the three-objective, linear control allocation problem is disclosed. The control allocation problem is that of distributing the effort of redundant control effectors to achieve some desired set of objectives. The problem is deemed linear if control effectiveness is affine with respect to the individual control effectors. The optimal solution is that which exploits the collective maximum capability of the effectors within their individual physical limits. Computational efficiency is measured by the number of floating-point operations required for solution. The method presented returned optimal solutions in more than 90% of the cases examined; non-optimal solutions returned by the method were typically much less than 1% different from optimal and the errors tended to become smaller than 0.01% as the number of controls was increased. The magnitude of the errors returned by the present method was much smaller than those that resulted from either pseudo inverse or cascaded generalized inverse solutions. The computational complexity of the method presented varied linearly with increasing numbers of controls; the number of required floating point operations increased from 5.5 i, to seven times faster than did the minimum-norm solution (the pseudoinverse), and at about the same rate as did the cascaded generalized inverse solution. The computational requirements of the method presented were much better than that of previously described facet-searching methods which increase in proportion to the square of the number of controls.

  7. High Performance Computing and Communications Panel Report.

    ERIC Educational Resources Information Center

    President's Council of Advisors on Science and Technology, Washington, DC.

    This report offers advice on the strengths and weaknesses of the High Performance Computing and Communications (HPCC) initiative, one of five presidential initiatives launched in 1992 and coordinated by the Federal Coordinating Council for Science, Engineering, and Technology. The HPCC program has the following objectives: (1) to extend U.S.…

  8. Computer-Mediated Communication and Interpersonal Perceptions.

    ERIC Educational Resources Information Center

    Adkins, Mark E.

    A study investigated the conditions under which computer-mediated communication (CMC) (electronic mail) senders were perceived as self-absorbed by CMC receivers. Experience with electronic mail was the independent variable and perceived self-absorption, attraction, and homophily were the dependent variables. Two-hundred fifty volunteers from a…

  9. Computer aided manipulator control

    NASA Technical Reports Server (NTRS)

    Bejczy, A. K.; Zawacki, R. L.

    1980-01-01

    This paper describes the hardware and software system of a dedicated mini- and microcomputer network developed at the JPL teleoperator project to aid the operator in real-time control of remote manipulators. The operator can be in series or in parallel with the control computer during operation. The purpose of the project is to develop, demonstrate and evaluate advanced supervisory control concepts and techniques for space applications. The paper concludes with a brief outline of future development plans and issues.

  10. Communication and the Control Revolution.

    ERIC Educational Resources Information Center

    Beniger, James R.

    1992-01-01

    Describes the efforts of Henry Crowell, developer of Quaker Oats, to develop a market for breakfast cereals using market research and advertising. Examines how innovations in communications technology have been brought about by the struggle to control the material economy in the face of industrialization. Traces the development of the information…

  11. Computational fluid dynamic control

    NASA Technical Reports Server (NTRS)

    Hartley, Tom T.; Deabreu-Garcia, Alex

    1989-01-01

    A general technique is presented for modeling fluid, or gas, dynamic systems specifically for the development of control systems. The numerical methods which are generally used in computational fluid dynamics are borrowed to create either continuous-time or discrete-time models of the particular fluid system. The resulting equations can be either left in a nonlinear form, or easily linearized about an operating point. As there are typically very many states in these systems, the usual linear model reduction methods can be used on them to allow a low-order controller to be designed. A simple example is given which typifies many internal flow control problems. The resulting control is termed computational fluid dynamic control.

  12. Optimal control computer programs

    NASA Technical Reports Server (NTRS)

    Kuo, F.

    1992-01-01

    The solution of the optimal control problem, even with low order dynamical systems, can usually strain the analytical ability of most engineers. The understanding of this subject matter, therefore, would be greatly enhanced if a software package existed that could simulate simple generic problems. Surprisingly, despite a great abundance of commercially available control software, few, if any, address the part of optimal control in its most generic form. The purpose of this paper is, therefore, to present a simple computer program that will perform simulations of optimal control problems that arise from the first necessary condition and the Pontryagin's maximum principle.

  13. Learning To Use Computers for Future Communication Professions.

    ERIC Educational Resources Information Center

    Hurme, Pertti

    A study examined how to teach computer skills to future professionals in communications. The context of the study was the communications department in a mid-sized Finnish university. Data was collected on computer use and attitudes to computers and computer-mediated communication by means of surveys and learning journals during the Communications…

  14. A lightweight communication library for distributed computing

    NASA Astrophysics Data System (ADS)

    Groen, Derek; Rieder, Steven; Grosso, Paola; de Laat, Cees; Portegies Zwart, Simon

    2010-01-01

    We present MPWide, a platform-independent communication library for performing message passing between computers. Our library allows coupling of several local message passing interface (MPI) applications through a long-distance network and is specifically optimized for such communications. The implementation is deliberately kept lightweight and platform independent, and the library can be installed and used without administrative privileges. The only requirements are a C++ compiler and at least one open port to a wide-area network on each site. In this paper we present the library, describe the user interface, present performance tests and apply MPWide in a large-scale cosmological N-body simulation on a network of two computers, one in Amsterdam and the other in Tokyo.

  15. Optimized data communications in a parallel computer

    DOEpatents

    Faraj, Daniel A

    2014-10-21

    A parallel computer includes nodes that include a network adapter that couples the node in a point-to-point network and supports communications in opposite directions of each dimension. Optimized communications include: receiving, by a network adapter of a receiving compute node, a packet--from a source direction--that specifies a destination node and deposit hints. Each hint is associated with a direction within which the packet is to be deposited. If a hint indicates the packet to be deposited in the opposite direction: the adapter delivers the packet to an application on the receiving node; forwards the packet to a next node in the opposite direction if the receiving node is not the destination; and forwards the packet to a node in a direction of a subsequent dimension if the hints indicate that the packet is to be deposited in the direction of the subsequent dimension.

  16. Optimized data communications in a parallel computer

    SciTech Connect

    Faraj, Daniel A.

    2014-08-19

    A parallel computer includes nodes that include a network adapter that couples the node in a point-to-point network and supports communications in opposite directions of each dimension. Optimized communications include: receiving, by a network adapter of a receiving compute node, a packet--from a source direction--that specifies a destination node and deposit hints. Each hint is associated with a direction within which the packet is to be deposited. If a hint indicates the packet to be deposited in the opposite direction: the adapter delivers the packet to an application on the receiving node; forwards the packet to a next node in the opposite direction if the receiving node is not the destination; and forwards the packet to a node in a direction of a subsequent dimension if the hints indicate that the packet is to be deposited in the direction of the subsequent dimension.

  17. TMS communications software. Volume 1: Computer interfaces

    NASA Technical Reports Server (NTRS)

    Brown, J. S.; Lenker, M. D.

    1979-01-01

    A prototype bus communications system, which is being used to support the Trend Monitoring System (TMS) as well as for evaluation of the bus concept is considered. Hardware and software interfaces to the MODCOMP and NOVA minicomputers are included. The system software required to drive the interfaces in each TMS computer is described. Documentation of other software for bus statistics monitoring and for transferring files across the bus is also included.

  18. Multiparty-controlled quantum secure direct communication

    SciTech Connect

    Xiu, X.-M. Dong, L.; Gao, Y.-J.; Chi, F.

    2007-12-15

    A theoretical scheme of a multiparty-controlled quantum secure direct communication is proposed. The supervisor prepares a communication network with Einstein-Podolsky-Rosen pairs and auxiliary particles. After passing a security test of the communication network, a supervisor tells the users the network is secure and they can communicate. If the controllers allow the communicators to communicate, the controllers should perform measurements and inform the communicators of the outcomes. The communicators then begin to communicate after they perform a security test of the quantum channel and verify that it is secure. The recipient can decrypt the secret message in a classical message from the sender depending on the protocol. Any two users in the network can communicate through the above processes under the control of the supervisor and the controllers.

  19. Analysis of Controller Communication in En Route Air Traffic Control.

    ERIC Educational Resources Information Center

    Seamster, Thomas L.; And Others

    To contribute to an understanding of the elements of good air traffic controller communication with the objective of providing recommendations to improve controller communication training, two studies analyzed team communication, ground-air communication, and ground-line communication. The simulated and live traffic analyses examined established…

  20. Guide to computing and communications at Brookhaven National Laboratory

    SciTech Connect

    Berry, H.; Fuchel, K.; Harris, A.

    1991-04-01

    This report contains information on the following topics of computing and communications at Brookhaven National Laboratory: computing hardware and operating systems; support services and facilities; getting started using the Central Scientific Computing Center (CSCF); CSCF software; data communication services; computer networking; personal computers and workstations; file storage and exchange; graphics; telecommunications services; and radio systems.

  1. Propulsion controlled aircraft computer

    NASA Technical Reports Server (NTRS)

    Cogan, Bruce R. (Inventor)

    2010-01-01

    A low-cost, easily retrofit Propulsion Controlled Aircraft (PCA) system for use on a wide range of commercial and military aircraft consists of an propulsion controlled aircraft computer that reads in aircraft data including aircraft state, pilot commands and other related data, calculates aircraft throttle position for a given maneuver commanded by the pilot, and then displays both current and calculated throttle position on a cockpit display to show the pilot where to move throttles to achieve the commanded maneuver, or is automatically sent digitally to command the engines directly.

  2. COMPUTER CONTROL OF BEHAVIORAL EXPERIMENTS.

    ERIC Educational Resources Information Center

    SIEGEL, LOUIS

    THE LINC COMPUTER PROVIDES A PARTICULAR SCHEDULE OF REINFORCEMENT FOR BEHAVIORAL EXPERIMENTS BY EXECUTING A SEQUENCE OF COMPUTER OPERATIONS IN CONJUNCTION WITH A SPECIALLY DESIGNED INTERFACE. THE INTERFACE IS THE MEANS OF COMMUNICATION BETWEEN THE EXPERIMENTAL CHAMBER AND THE COMPUTER. THE PROGRAM AND INTERFACE OF AN EXPERIMENT INVOLVING A PIGEON…

  3. Media communication center using brain computer interface.

    PubMed

    Teo, Eugene; Huang, Alvin; Lian, Yong; Guan, Cuntai; Li, Yuanqing; Zhang, Haihong

    2006-01-01

    This paper attempts to make use of brain computer interface (BCI) in implementing an application called the media communication center for the paralyzed people. The application is based on the event-related potential called P300 to perform button selections on media and communication programs such as the mp3 player, video player, photo gallery and e-book. One of the key issues in such system is the usability. We study how various tasks affect the application operation, in particular, how typical mental activities cause false trigger during the operation of the application. We study the false acceptance rate under the conditions of closing eyes, reading a book, listening to music and watching a video. Data from 5 subjects is used to obtain the false rejection rate and false acceptance rate of the BCI system. Our study shows that different mental activities show different impacts on the false acceptance performances. PMID:17946993

  4. Fingerprinting Communication and Computation on HPC Machines

    SciTech Connect

    Peisert, Sean

    2010-06-02

    How do we identify what is actually running on high-performance computing systems? Names of binaries, dynamic libraries loaded, or other elements in a submission to a batch queue can give clues, but binary names can be changed, and libraries provide limited insight and resolution on the code being run. In this paper, we present a method for"fingerprinting" code running on HPC machines using elements of communication and computation. We then discuss how that fingerprint can be used to determine if the code is consistent with certain other types of codes, what a user usually runs, or what the user requested an allocation to do. In some cases, our techniques enable us to fingerprint HPC codes using runtime MPI data with a high degree of accuracy.

  5. Communicable Diseases and Outbreak Control.

    PubMed

    Ameli, Jonathan

    2015-10-01

    Infectious disease during an emergency condition can raise the death rate 60 times in comparison to other causes including trauma. An epidemic, or outbreak, can occur when several aspects of the agent (pathogen), population (hosts), and the environment create an ideal situation for spread. Overcrowding, poor regional design and hygiene due to poverty, dirty drinking water, rapid climate changes, and natural disasters, can lead to conditions that allow easier transmission of disease. Once it has been established that an emergency condition exists, there must be a prompt and thorough response for communicable disease control. A camp should be created, and the disease managed rapidly. The overall goals are rapid assessment, prevention, surveillance, outbreak control, and disease management. PMID:27437528

  6. NASA High Performance Computing and Communications program

    NASA Technical Reports Server (NTRS)

    Holcomb, Lee; Smith, Paul; Hunter, Paul

    1994-01-01

    The National Aeronautics and Space Administration's HPCC program is part of a new Presidential initiative aimed at producing a 1000-fold increase in supercomputing speed and a 1(X)-fold improvement in available communications capability by 1997. As more advanced technologies are developed under the HPCC program, they will be used to solve NASA's 'Grand Challenge' problems, which include improving the design and simulation of advanced aerospace vehicles, allowing people at remote locations to communicate more effectively and share information, increasing scientists' abilities to model the Earth's climate and forecast global environmental trends, and improving the development of advanced spacecraft. NASA's HPCC program is organized into three projects which are unique to the agency's mission: the Computational Aerosciences (CAS) project, the Earth and Space Sciences (ESS) project, and the Remote Exploration and Experimentation (REE) project. An additional project, the Basic Research and Human Resources (BRHR) project, exists to promote long term research in computer science and engineering and to increase the pool of trained personnel in a variety of scientific disciplines. This document presents an overview of the objectives and organization of these projects, as well as summaries of early accomplishments and the significance, status, and plans for individual research and development programs within each project. Areas of emphasis include benchmarking, testbeds, software and simulation methods.

  7. NASA high performance computing and communications program

    NASA Technical Reports Server (NTRS)

    Holcomb, Lee; Smith, Paul; Hunter, Paul

    1993-01-01

    The National Aeronautics and Space Administration's HPCC program is part of a new Presidential initiative aimed at producing a 1000-fold increase in supercomputing speed and a 100-fold improvement in available communications capability by 1997. As more advanced technologies are developed under the HPCC program, they will be used to solve NASA's 'Grand Challenge' problems, which include improving the design and simulation of advanced aerospace vehicles, allowing people at remote locations to communicate more effectively and share information, increasing scientist's abilities to model the Earth's climate and forecast global environmental trends, and improving the development of advanced spacecraft. NASA's HPCC program is organized into three projects which are unique to the agency's mission: the Computational Aerosciences (CAS) project, the Earth and Space Sciences (ESS) project, and the Remote Exploration and Experimentation (REE) project. An additional project, the Basic Research and Human Resources (BRHR) project exists to promote long term research in computer science and engineering and to increase the pool of trained personnel in a variety of scientific disciplines. This document presents an overview of the objectives and organization of these projects as well as summaries of individual research and development programs within each project.

  8. Is Computer-Mediated Communication Contributing to Organizational Productivity?

    ERIC Educational Resources Information Center

    Hacker, Kenneth L.

    Recurring claims of the poor relationship of computer adoption and organizational productivity may be of interest to communication scientists who study computer mediated communication (CMC). Cognitive science researchers advocate the same solution to this problem as many communication scientists, i.e., formative research. Iterating design and user…

  9. Modern control centers and computer networking

    SciTech Connect

    Dy-Liacco, T.E.

    1994-10-01

    The automation of power system operation is generally achieved with the implementation of two control centers, one for the operation of the generation-transmission system and the other for the operation of the distribution system. These control centers are referred to, respectively, as the energy management system (EMS) and the distribution management system (DMS). The EMS may consist of several control centers in a hierarchy. The DMS may be made up of several independent distribution control centers. This article features the fundamental design aspects of modern EMS and DMS control centers (computer networks, distributed processing, and distributed databases), the linking of computer networks, and the communications that support such internetworking. The extension of such networking beyond the confines of system operation to other corporate networks is now made practical by the maturing concepts of client-server architectures and by the availability of modern communication technologies.

  10. Cross-Cultural Communication Patterns in Computer Mediated Communication

    ERIC Educational Resources Information Center

    Panina, Daria; Kroumova, Maya

    2015-01-01

    There are important cultural differences in attitudes towards and use of electronic text communication. Consistent with Hall's high-context/low-context conceptualization of culture, electronic inter-cultural communication, just as verbal inter-cultural communication, is affected by the culturally-specific assumptions and preferences of message…

  11. Absolute nonlocality via distributed computing without communication

    NASA Astrophysics Data System (ADS)

    Czekaj, Ł.; Pawłowski, M.; Vértesi, T.; Grudka, A.; Horodecki, M.; Horodecki, R.

    2015-09-01

    Understanding the role that quantum entanglement plays as a resource in various information processing tasks is one of the crucial goals of quantum information theory. Here we propose an alternative perspective for studying quantum entanglement: distributed computation of functions without communication between nodes. To formalize this approach, we propose identity games. Surprisingly, despite no signaling, we obtain that nonlocal quantum strategies beat classical ones in terms of winning probability for identity games originating from certain bipartite and multipartite functions. Moreover we show that, for a majority of functions, access to general nonsignaling resources boosts success probability two times in comparison to classical ones for a number of large enough outputs. Because there are no constraints on the inputs and no processing of the outputs in the identity games, they detect very strong types of correlations: absolute nonlocality.

  12. PREFACE: Quantum Information, Communication, Computation and Cryptography

    NASA Astrophysics Data System (ADS)

    Benatti, F.; Fannes, M.; Floreanini, R.; Petritis, D.

    2007-07-01

    The application of quantum mechanics to information related fields such as communication, computation and cryptography is a fast growing line of research that has been witnessing an outburst of theoretical and experimental results, with possible practical applications. On the one hand, quantum cryptography with its impact on secrecy of transmission is having its first important actual implementations; on the other hand, the recent advances in quantum optics, ion trapping, BEC manipulation, spin and quantum dot technologies allow us to put to direct test a great deal of theoretical ideas and results. These achievements have stimulated a reborn interest in various aspects of quantum mechanics, creating a unique interplay between physics, both theoretical and experimental, mathematics, information theory and computer science. In view of all these developments, it appeared timely to organize a meeting where graduate students and young researchers could be exposed to the fundamentals of the theory, while senior experts could exchange their latest results. The activity was structured as a school followed by a workshop, and took place at The Abdus Salam International Center for Theoretical Physics (ICTP) and The International School for Advanced Studies (SISSA) in Trieste, Italy, from 12-23 June 2006. The meeting was part of the activity of the Joint European Master Curriculum Development Programme in Quantum Information, Communication, Cryptography and Computation, involving the Universities of Cergy-Pontoise (France), Chania (Greece), Leuven (Belgium), Rennes1 (France) and Trieste (Italy). This special issue of Journal of Physics A: Mathematical and Theoretical collects 22 contributions from well known experts who took part in the workshop. They summarize the present day status of the research in the manifold aspects of quantum information. The issue is opened by two review articles, the first by G Adesso and F Illuminati discussing entanglement in continuous variable

  13. Role of information systems in controlling costs: the electronic medical record (EMR) and the high-performance computing and communications (HPCC) efforts

    NASA Astrophysics Data System (ADS)

    Kun, Luis G.

    1994-12-01

    On October 18, 1991, the IEEE-USA produced an entity statement which endorsed the vital importance of the High Performance Computer and Communications Act of 1991 (HPCC) and called for the rapid implementation of all its elements. Efforts are now underway to develop a Computer Based Patient Record (CBPR), the National Information Infrastructure (NII) as part of the HPCC, and the so-called `Patient Card'. Multiple legislative initiatives which address these and related information technology issues are pending in Congress. Clearly, a national information system will greatly affect the way health care delivery is provided to the United States public. Timely and reliable information represents a critical element in any initiative to reform the health care system as well as to protect and improve the health of every person. Appropriately used, information technologies offer a vital means of improving the quality of patient care, increasing access to universal care and lowering overall costs within a national health care program. Health care reform legislation should reflect increased budgetary support and a legal mandate for the creation of a national health care information system by: (1) constructing a National Information Infrastructure; (2) building a Computer Based Patient Record System; (3) bringing the collective resources of our National Laboratories to bear in developing and implementing the NII and CBPR, as well as a security system with which to safeguard the privacy rights of patients and the physician-patient privilege; and (4) utilizing Government (e.g. DOD, DOE) capabilities (technology and human resources) to maximize resource utilization, create new jobs and accelerate technology transfer to address health care issues.

  14. Nonroutine Transactions in Controller-Pilot Communication.

    ERIC Educational Resources Information Center

    Morrow, Daniel; And Others

    1994-01-01

    Examines how the collaborative scheme is used to balance the demands of accuracy and efficiency during routine and nonroutine pilot-controller communication. Suggests that several communication problems can be traced to nonstandard collaborative practices that tax controller and pilot attention and memory. (SR)

  15. Crew/computer communications study. Volume 1: Final report. [onboard computerized communications system for spacecrews

    NASA Technical Reports Server (NTRS)

    Johannes, J. D.

    1974-01-01

    Techniques, methods, and system requirements are reported for an onboard computerized communications system that provides on-line computing capability during manned space exploration. Communications between man and computer take place by sequential execution of each discrete step of a procedure, by interactive progression through a tree-type structure to initiate tasks or by interactive optimization of a task requiring man to furnish a set of parameters. Effective communication between astronaut and computer utilizes structured vocabulary techniques and a word recognition system.

  16. Computing, Information, and Communications Technology (CICT) Program Overview

    NASA Technical Reports Server (NTRS)

    VanDalsem, William R.

    2003-01-01

    The Computing, Information and Communications Technology (CICT) Program's goal is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communication technologies

  17. Communication and Computability: The Case of Alan Mathison Turing.

    ERIC Educational Resources Information Center

    Chesebro, James W.

    1993-01-01

    Provides a preliminary examination of the relationships which exist between the disciplines of communication and computer science. Isolates the original principles which determined the development of computer science. Suggests how these early formation principles had and continue to have on the study of communication. Focuses on the seminal role…

  18. Intersections between the Autism Spectrum and the Internet: Perceived Benefits and Preferred Functions of Computer-Mediated Communication

    ERIC Educational Resources Information Center

    Gillespie-Lynch, Kristen; Kapp, Steven K.; Shane-Simpson, Christina; Smith, David Shane; Hutman, Ted

    2014-01-01

    An online survey compared the perceived benefits and preferred functions of computer-mediated communication of participants with (N = 291) and without ASD (N = 311). Participants with autism spectrum disorder (ASD) perceived benefits of computer-mediated communication in terms of increased comprehension and control over communication, access to…

  19. Noninvasive brain-computer interface enables communication after brainstem stroke

    PubMed Central

    Sellers, Eric W.; Ryan, David B.; Hauser, Christopher K.

    2016-01-01

    Brain-computer interfaces (BCIs) provide communication that is independent of muscle control, and can be especially important for individuals with severe neuromuscular disease who cannot use standard communication pathways or other assistive technology. It has previously been shown that people with amyotrophic lateral sclerosis (ALS) can successfully use BCI after all other means of independent communication have failed. The BCI literature has asserted that brainstem stroke survivors can also benefit from BCI use. This study used a P300-based event-related potential spelling system. This case study demonstrates that an individual locked-in owing to brainstem stroke was able to use a noninvasive BCI to communicate volitional messages. Over a period of 13 months, the participant was able to successfully operate the system during 40 of 62 recording sessions. He was able to accurately spell words provided by the experimenter and to initiate dialogues with his family. The results broadly suggest that, regardless of the precipitating event, BCI use may be of benefit to those with locked-in syndrome. PMID:25298323

  20. Computer Laboratory Assistant Interactions with Communication Students.

    ERIC Educational Resources Information Center

    O'Donnell, Karen

    Although numerous studies focus upon computer attitudes and computer anxiety, relatively few studies analyze the interaction between a computer laboratory assistant and the individual who is asking the question. This paper begins with a brief overview of the literature that discusses attitudes towards computers, computer anxiety, and computer…

  1. Current Trend Towards Using Soft Computing Approaches to Phase Synchronization in Communication Systems

    NASA Technical Reports Server (NTRS)

    Drake, Jeffrey T.; Prasad, Nadipuram R.

    1999-01-01

    This paper surveys recent advances in communications that utilize soft computing approaches to phase synchronization. Soft computing, as opposed to hard computing, is a collection of complementary methodologies that act in producing the most desirable control, decision, or estimation strategies. Recently, the communications area has explored the use of the principal constituents of soft computing, namely, fuzzy logic, neural networks, and genetic algorithms, for modeling, control, and most recently for the estimation of phase in phase-coherent communications. If the receiver in a digital communications system is phase-coherent, as is often the case, phase synchronization is required. Synchronization thus requires estimation and/or control at the receiver of an unknown or random phase offset.

  2. 7 CFR 1726.176 - Communications and control facilities.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... line carrier communications systems, load control, and supervisory control and data acquisition (SCADA...) Load control systems, communications systems, and SCADA systems—(1) Contract forms. The borrower...

  3. 7 CFR 1726.176 - Communications and control facilities.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... line carrier communications systems, load control, and supervisory control and data acquisition (SCADA...) Load control systems, communications systems, and SCADA systems—(1) Contract forms. The borrower...

  4. 7 CFR 1726.176 - Communications and control facilities.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... line carrier communications systems, load control, and supervisory control and data acquisition (SCADA...) Load control systems, communications systems, and SCADA systems—(1) Contract forms. The borrower...

  5. 7 CFR 1726.176 - Communications and control facilities.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... line carrier communications systems, load control, and supervisory control and data acquisition (SCADA...) Load control systems, communications systems, and SCADA systems—(1) Contract forms. The borrower...

  6. Organizational Culture and the Design of Computer-Mediated Communication Systems: Issues for Organizational Communication Research.

    ERIC Educational Resources Information Center

    Hacker, Kenneth L.; And Others

    The study of computer mediated communication (CMC) systems in organizations is necessary for a complete examination and explanation of organizational culture and communication. Research has shown that the effects of CMC systems have been both positive and negative. Positively, they have helped to augment oral communication. Negatively, they have…

  7. Collaboration in Controller-Pilot Communication

    NASA Technical Reports Server (NTRS)

    Morrow, Daniel; Lebacqz, J. Victor (Technical Monitor)

    1994-01-01

    Like other forms of dialogue, air traffic control (ATC) communication is an act of collaboration between two or more people. Collaboration progresses more or less smoothly depending on speaker and listener strategies. For example, we have found that the way controllers organize and deliver messages influences how easily pilots understand these messages, which in turn determines how much time and effort is needed to successfully complete the transaction. In this talk, I will introduce a collaborative framework for investigating controller-pilot communication and then describe a set of studies that investigate ATC communication from two complementary directions. First, we focused on the impact of ATC message factors (e.g., length, speech rate) on the cognitive processes involved in ATC: communication. Second, we examined pilot factors that influence the amount of cognitive resources available for these communication processes. These studies also illustrate how the collaborate framework can help analyze the impact of proposed visual data link systems on ATC communication. Examining the joint effects of communication medium, message factors, and pilot/controller factors on performance should help improve air safety and communication efficiency. Increased efficiency is important for meeting the growing demands on the National Air System.

  8. WP EMPLACEMENT CONTROL AND COMMUNICATION EQUIPMENT DESCRIPTIONS

    SciTech Connect

    N.T. Raczka

    1997-10-02

    The objective and scope of this document are to list and briefly describe the major control and communication equipment necessary for waste package emplacement at the proposed nuclear waste repository at Yucca Mountain. Primary performance characteristics and some specialized design features of the required equipment are explained and summarized in the individual subsections of this document. This task was evaluated in accordance with QAP-2-0 and found not to be quality affecting. Therefore, this document was prepared in accordance with NAP-MG-012. The following control and communication equipment are addressed in this document: (1) Programmable Logic Controllers (PLC's); (2) Leaky Feeder Radio Frequency Communication Equipment; (3) Slotted Microwave guide Communication Equipment; (4) Vision Systems; (5) Radio Control Equipment; and (6) Enclosure Cooling Systems.

  9. Viewpoints on control of military satellite communications

    NASA Astrophysics Data System (ADS)

    Heppe, S. B.

    1983-07-01

    The three main factors are system management, communication protocols, and the control system architecture. Each of these is analyzed here in terms of a model. The model for system management is the definition of system control of the Defense Communications System, referred to as DCS syscon. The model for communication protocols is referred to as the ISO model of OSI, ISO denoting the International Standards Organization and OSI denoting open systems interconnection. The model of the control system architecture is an elemental model. The interplay between the models is highlighted. Examples are presented from the Defense Satellite Communications System and from MILSTAR. Prospects for the future are considered in view of the integration expected as systems become more capable and sophisticated. It is expected that many of the real-time control functions performed at the worldwide and theater levels will be automated on the satellite.

  10. Computer Control For Ion Engines

    NASA Technical Reports Server (NTRS)

    Brophy, John R.

    1989-01-01

    Computer system controls start-up, steady-state operation, throttling, and shutdown of pair of xenon-ion propulsion engines. Controls direction of thrust of each engine through operation of gimbal stepping motors. Controls valves in propellant-storage and propellant-distribution system. Control software establishes and maintains efficient, stable operation over entire range of operating variables, and throttles engines to any point within range. Computer operates power supplies, valves, and flow controllers of two ion engines, ion-neutralizer subsystem, and other equipment. Designed for use in interplanetary flight, system adaptable to industrial use in ion-beam deposition of thin films.

  11. Characteristics of Students Related to Computer-Mediated Communications Activity.

    ERIC Educational Resources Information Center

    Fishman, Barry J.

    1999-01-01

    Describes a study of individual differences among high school students that relate to and predict their use of computer-mediated communication (CMC) tools--e-mail, Usenet news, and a multimedia notebook--to support project-based science learning. Findings indicate that skill and experience with computers, parental education, access to computers,…

  12. Linguistic Analysis of Natural Language Communication with Computers.

    ERIC Educational Resources Information Center

    Thompson, Bozena Henisz

    Interaction with computers in natural language requires a language that is flexible and suited to the task. This study of natural dialogue was undertaken to reveal those characteristics which can make computer English more natural. Experiments were made in three modes of communication: face-to-face, terminal-to-terminal, and human-to-computer,…

  13. Name Authority Control in a Communication System.

    ERIC Educational Resources Information Center

    Elias, Cathy Ann; Fair, C. James

    1983-01-01

    Examines use of Electronic Office System by Corporate Media Relations, a division of Communication Services, Standard Oil Company, focusing on the problem of name authority control. The media query file, variant entry problems, problems resulting from ineffective name authority control, and developing a control system are covered. Four sources are…

  14. A universal computer control system for motors

    NASA Technical Reports Server (NTRS)

    Szakaly, Zoltan F. (Inventor)

    1991-01-01

    A control system for a multi-motor system such as a space telerobot, having a remote computational node and a local computational node interconnected with one another by a high speed data link is described. A Universal Computer Control System (UCCS) for the telerobot is located at each node. Each node is provided with a multibus computer system which is characterized by a plurality of processors with all processors being connected to a common bus, and including at least one command processor. The command processor communicates over the bus with a plurality of joint controller cards. A plurality of direct current torque motors, of the type used in telerobot joints and telerobot hand-held controllers, are connected to the controller cards and responds to digital control signals from the command processor. Essential motor operating parameters are sensed by analog sensing circuits and the sensed analog signals are converted to digital signals for storage at the controller cards where such signals can be read during an address read/write cycle of the command processing processor.

  15. Computer-Assisted Instruction in Communication Engineering.

    ERIC Educational Resources Information Center

    Einarsson, Goran

    1977-01-01

    This paper gives an account of a pedagogical project using the computer in teaching an electrical engineering subject. The aim was to combine the computer with other activities, as one element in an active educational process. This has led to a small group instructional approach where the computer is used in various ways in courses on different…

  16. Brain-computer interfaces for communication and rehabilitation.

    PubMed

    Chaudhary, Ujwal; Birbaumer, Niels; Ramos-Murguialday, Ander

    2016-09-01

    Brain-computer interfaces (BCIs) use brain activity to control external devices, thereby enabling severely disabled patients to interact with the environment. A variety of invasive and noninvasive techniques for controlling BCIs have been explored, most notably EEG, and more recently, near-infrared spectroscopy. Assistive BCIs are designed to enable paralyzed patients to communicate or control external robotic devices, such as prosthetics; rehabilitative BCIs are designed to facilitate recovery of neural function. In this Review, we provide an overview of the development of BCIs and the current technology available before discussing experimental and clinical studies of BCIs. We first consider the use of BCIs for communication in patients who are paralyzed, particularly those with locked-in syndrome or complete locked-in syndrome as a result of amyotrophic lateral sclerosis. We then discuss the use of BCIs for motor rehabilitation after severe stroke and spinal cord injury. We also describe the possible neurophysiological and learning mechanisms that underlie the clinical efficacy of BCIs. PMID:27539560

  17. Signaling communication events in a computer network

    DOEpatents

    Bender, Carl A.; DiNicola, Paul D.; Gildea, Kevin J.; Govindaraju, Rama K.; Kim, Chulho; Mirza, Jamshed H.; Shah, Gautam H.; Nieplocha, Jaroslaw

    2000-01-01

    A method, apparatus and program product for detecting a communication event in a distributed parallel data processing system in which a message is sent from an origin to a target. A low-level application programming interface (LAPI) is provided which has an operation for associating a counter with a communication event to be detected. The LAPI increments the counter upon the occurrence of the communication event. The number in the counter is monitored, and when the number increases, the event is detected. A completion counter in the origin is associated with the completion of a message being sent from the origin to the target. When the message is completed, LAPI increments the completion counter such that monitoring the completion counter detects the completion of the message. The completion counter may be used to insure that a first message has been sent from the origin to the target and completed before a second message is sent.

  18. The Maturation of Norms for Computer-Mediated Communication.

    ERIC Educational Resources Information Center

    Newby, Gregory B.

    1993-01-01

    Analyzes the communication norms of the major forms of computer-mediated communication, including electronic mail, mailing lists, Usenet and other bulletin board systems, interactive messaging, multiuser domains (MUDs), and mass-broadcast media. New uses and the development of standards, or norms, are discussed. (Contains 11 references.) (LRW)

  19. Incorporating Computer-Mediated Communication in Project Work

    ERIC Educational Resources Information Center

    Musa, Faridah; Mohamed, Maslawati; Mufti, Norlaila; Latiff, Rozmel Abdul; Amin, Maryam Mohamad

    2015-01-01

    In line with the new trend of using computer-mediated communication (CMC) as an innovative technique in teaching and learning at higher institutions, Facebook as a channel of CMC was employed in carrying out a project work in an Academic Communication Course. For this project, students worked in groups to discuss their work and share information…

  20. Leveraging Social Computing for Personalized Crisis Communication using Social Media

    PubMed Central

    Leykin, Dmitry; Aharonson-Daniel, Limor; Lahad, Mooli

    2016-01-01

    Introduction: The extensive use of social media in modern life redefines social interaction and communication. Communication plays an important role in mitigating, or exacerbating, the psychological and behavioral responses to critical incidents and disasters. As recent disasters demonstrated, people tend to converge to social media during and following emergencies. Authorities can then use this media and other computational methods to gain insights from the public, mainly to enhance situational awareness, but also to improve their communication with the public and public adherence to instructions. Methods: The current review presents a conceptual framework for studying psychological aspects of crisis and risk communication using the social media through social computing. Results: Advanced analytical tools can be integrated in the processes and objectives of crisis communication. The availability of the computational techniques can improve communication with the public by a process of Hyper-Targeted Crisis Communication. Discussion: The review suggests that using advanced computational tools for target-audience profiling and linguistic matching in social media, can facilitate more sensitive and personalized emergency communication. PMID:27092290

  1. The Reliability of Content Analysis of Computer Conference Communication

    ERIC Educational Resources Information Center

    Rattleff, Pernille

    2007-01-01

    The focus of this article is the reliability of content analysis of students' computer conference communication. Content analysis is often used when researching the relationship between learning and the use of information and communications technology in educational settings. A number of studies where content analysis is used and classification…

  2. Pervasive Computing and Communication Technologies for U-Learning

    ERIC Educational Resources Information Center

    Park, Young C.

    2014-01-01

    The development of digital information transfer, storage and communication methods influences a significant effect on education. The assimilation of pervasive computing and communication technologies marks another great step forward, with Ubiquitous Learning (U-learning) emerging for next generation learners. In the evolutionary view the 5G (or…

  3. Computer-Mediated Communication Modality and Psychological Well-Being

    ERIC Educational Resources Information Center

    Ess, Brian C.

    2013-01-01

    The growth of Internet usage in American society has added new modes of communication, primarily through computer-mediated communication (CMC)on the Internet. Research on the relationship between Internet use and psychological well-being has been mixed and this study attempted to reconcile the discrepancies in results by exploring the…

  4. Man-Computer Communications and CAI.

    ERIC Educational Resources Information Center

    Hunka, S.

    A variety of direct and indirect instructional activities during the last ten years have employed computers. Within Computer Assisted Instruction (CAI) programs, the following broad classes of instructional strategies have been generally accepted: tutorial, drill and practice, review, testing, remediation and diagnosis, problem solving, and…

  5. Asynchronous Communication Scheme For Hypercube Computer

    NASA Technical Reports Server (NTRS)

    Madan, Herb S.

    1988-01-01

    Scheme devised for asynchronous-message communication system for Mark III hypercube concurrent-processor network. Network consists of up to 1,024 processing elements connected electrically as though were at corners of 10-dimensional cube. Each node contains two Motorola 68020 processors along with Motorola 68881 floating-point processor utilizing up to 4 megabytes of shared dynamic random-access memory. Scheme intended to support applications requiring passage of both polled or solicited and unsolicited messages.

  6. Computational modeling and multilevel cancer control interventions.

    PubMed

    Morrissey, Joseph P; Lich, Kristen Hassmiller; Price, Rebecca Anhang; Mandelblatt, Jeanne

    2012-05-01

    This chapter presents an overview of computational modeling as a tool for multilevel cancer care and intervention research. Model-based analyses have been conducted at various "beneath the skin" or biological scales as well as at various "above the skin" or socioecological levels of cancer care delivery. We review the basic elements of computational modeling and illustrate its applications in four cancer control intervention areas: tobacco use, colorectal cancer screening, cervical cancer screening, and racial disparities in access to breast cancer care. Most of these models have examined cancer processes and outcomes at only one or two levels. We suggest ways these models can be expanded to consider interactions involving three or more levels. Looking forward, a number of methodological, structural, and communication barriers must be overcome to create useful computational models of multilevel cancer interventions and population health. PMID:22623597

  7. Defining Information Needs of Computer Users: A Human Communication Problem.

    ERIC Educational Resources Information Center

    Kimbrough, Kenneth L.

    This exploratory investigation of the process of defining the information needs of computer users and the impact of that process on information retrieval focuses on communication problems. Six sites were visited that used computers to process data or to provide information, including the California Department of Transportation, the California…

  8. "Computer" and "Information and Communication Technology": Students' Culture Specific Interpretations

    ERIC Educational Resources Information Center

    Elen, Jan; Clarebout, Geraldine; Sarfo, Frederick Kwaku; Louw, Lambertus Philippus; Poysa-Tarhonen, Johanna; Stassens, Nick

    2010-01-01

    Given the use of information and communication technology (ICT) and computer as synonyms in ICT-integration research on the one hand, and the potential problems in doing so on the other, this contribution tries to gain insight in the understanding of the words computer and ICT in different settings. In five different countries (Belgium, Finland,…

  9. Promoting High-Performance Computing and Communications. A CBO Study.

    ERIC Educational Resources Information Center

    Webre, Philip

    In 1991 the Federal Government initiated the multiagency High Performance Computing and Communications program (HPCC) to further the development of U.S. supercomputer technology and high-speed computer network technology. This overview by the Congressional Budget Office (CBO) concentrates on obstacles that might prevent the growth of the…

  10. Computational Psychometrics in Communication and Implications in Decision Making

    PubMed Central

    Cipresso, Pietro; Villani, Daniela; Repetto, Claudia; Bosone, Lucia; Balgera, Anna; Mauri, Maurizio; Villamira, Marco; Antonietti, Alessandro; Riva, Giuseppe

    2015-01-01

    Recent investigations emphasized the role of communication features on behavioral trust and reciprocity in economic decision making but no studies have been focused on the effect of communication on affective states in such a context. Thanks to advanced methods of computational psychometrics, in this study, affective states were deeply examined using simultaneous and synchronized recordings of gazes and psychophysiological signals in 28 female students during an investment game. Results showed that participants experienced different affective states according to the type of communication (personal versus impersonal). In particular, participants involved in personal communication felt more relaxed than participants involved in impersonal communication. Moreover, personal communication influenced reciprocity and participants' perceptions about trust and reciprocity. Findings were interpreted in the light of the Arousal/Valence Model and self-disclosure process. PMID:26339285

  11. Adoption of Computer Communication Technology by Communication Faculty: A Case Study.

    ERIC Educational Resources Information Center

    Herling, Thomas J.

    A comparative case study investigated the extent of adoption of computer communication in two schools of communication. S. Ram's model of resistance to innovation was used as a theoretical framework. Subjects, 16 faculty at a medium-sized state school in the southern United States and 16 faculty at a large private institution in the Northeast,…

  12. Methods for operating parallel computing systems employing sequenced communications

    DOEpatents

    Benner, R.E.; Gustafson, J.L.; Montry, G.R.

    1999-08-10

    A parallel computing system and method are disclosed having improved performance where a program is concurrently run on a plurality of nodes for reducing total processing time, each node having a processor, a memory, and a predetermined number of communication channels connected to the node and independently connected directly to other nodes. The present invention improves performance of the parallel computing system by providing a system which can provide efficient communication between the processors and between the system and input and output devices. A method is also disclosed which can locate defective nodes with the computing system. 15 figs.

  13. Methods for operating parallel computing systems employing sequenced communications

    DOEpatents

    Benner, Robert E.; Gustafson, John L.; Montry, Gary R.

    1999-01-01

    A parallel computing system and method having improved performance where a program is concurrently run on a plurality of nodes for reducing total processing time, each node having a processor, a memory, and a predetermined number of communication channels connected to the node and independently connected directly to other nodes. The present invention improves performance of performance of the parallel computing system by providing a system which can provide efficient communication between the processors and between the system and input and output devices. A method is also disclosed which can locate defective nodes with the computing system.

  14. Metastability and Coherence: Extending the Communication through Coherence Hypothesis Using A Whole-Brain Computational Perspective.

    PubMed

    Deco, Gustavo; Kringelbach, Morten L

    2016-03-01

    Understanding the mechanisms for communication in the brain remains one of the most challenging scientific questions. The communication through coherence (CTC) hypothesis was originally proposed 10 years ago, stating that two groups of neurons communicate most effectively when their excitability fluctuations are coordinated in time (i.e., coherent), and this control by cortical coherence is a fundamental brain mechanism for large-scale, distant communication. In light of new evidence from whole-brain computational modelling of multimodal neuroimaging data, we link CTC to the concept of metastability, which refers to a rich exploration of the functional repertoire made possible by the underlying structural whole-brain connectivity. PMID:26833259

  15. Learning Style Theory and Computer Mediated Communication.

    ERIC Educational Resources Information Center

    Atkins, Hilary; Moore, David; Sharpe, Simon; Hobbs, Dave

    This paper looks at the low participation rates in computer mediated conferences (CMC) and argues that one of the causes of this may be an incompatibility between students' learning styles and the style adopted by CMC. Curry's Onion Model provides a well-established framework within which to view the main learning style theories (Riding and…

  16. Computation and control with neural nets

    SciTech Connect

    Corneliusen, A.; Terdal, P.; Knight, T.; Spencer, J.

    1989-10-04

    As energies have increased exponentially with time so have the size and complexity of accelerators and control systems. NN may offer the kinds of improvements in computation and control that are needed to maintain acceptable functionality. For control their associative characteristics could provide signal conversion or data translation. Because they can do any computation such as least squares, they can close feedback loops autonomously to provide intelligent control at the point of action rather than at a central location that requires transfers, conversions, hand-shaking and other costly repetitions like input protection. Both computation and control can be integrated on a single chip, printed circuit or an optical equivalent that is also inherently faster through full parallel operation. For such reasons one expects lower costs and better results. Such systems could be optimized by integrating sensor and signal processing functions. Distributed nets of such hardware could communicate and provide global monitoring and multiprocessing in various ways e.g. via token, slotted or parallel rings (or Steiner trees) for compatibility with existing systems. Problems and advantages of this approach such as an optimal, real-time Turing machine are discussed. Simple examples are simulated and hardware implemented using discrete elements that demonstrate some basic characteristics of learning and parallelism. Future microprocessors' are predicted and requested on this basis. 19 refs., 18 figs.

  17. Adaptive Power Control for Space Communications

    NASA Technical Reports Server (NTRS)

    Thompson, Willie L., II; Israel, David J.

    2008-01-01

    This paper investigates the implementation of power control techniques for crosslinks communications during a rendezvous scenario of the Crew Exploration Vehicle (CEV) and the Lunar Surface Access Module (LSAM). During the rendezvous, NASA requires that the CEV supports two communication links: space-to-ground and crosslink simultaneously. The crosslink will generate excess interference to the space-to-ground link as the distances between the two vehicles decreases, if the output power is fixed and optimized for the worst-case link analysis at the maximum distance range. As a result, power control is required to maintain the optimal power level for the crosslink without interfering with the space-to-ground link. A proof-of-concept will be described and implemented with Goddard Space Flight Center (GSFC) Communications, Standard, and Technology Lab (CSTL).

  18. Personal computers in accelerator control

    NASA Astrophysics Data System (ADS)

    Anderssen, P. S.

    1988-07-01

    The advent of the personal computer has created a popular movement which has also made a strong impact on science and engineering. Flexible software environments combined with good computational performance and large storage capacities are becoming available at steadily decreasing costs. Of equal importance, however, is the quality of the user interface offered on many of these products. Graphics and screen interaction is available in ways that were only possible on specialized systems before. Accelerator engineers were quick to pick up the new technology. The first applications were probably for controllers and data gatherers for beam measurement equipment. Others followed, and today it is conceivable to make personal computer a standard component of an accelerator control system. This paper reviews the experience gained at CERN so far and describes the approach taken in the design of the common control center for the SPS and the future LEP accelerators. The design goal has been to be able to integrate personal computers into the accelerator control system and to build the operator's workplace around it.

  19. Computer-controlled warmup circuit

    NASA Technical Reports Server (NTRS)

    Daeges, J. J.

    1980-01-01

    Filament of high-power radio transmitter is brought to operating temperature automatically. Pushbotton reduces operator's role to one-step command and is compatible with various forms of computer control. Filiament shutdown is initiated by "down" command from operator, failure of cooling systems, or power failure for more than few seconds.

  20. Computational approaches to motor control

    PubMed Central

    Flash, Tamar; Sejnowski, Terrence J

    2010-01-01

    New concepts and computational models that integrate behavioral and neurophysiological observations have addressed several of the most fundamental long-standing problems in motor control. These problems include the selection of particular trajectories among the large number of possibilities, the solution of inverse kinematics and dynamics problems, motor adaptation and the learning of sequential behaviors. PMID:11741014

  1. Control of Telerobots with Variable Communication Delay

    NASA Technical Reports Server (NTRS)

    Oboe, R.; Fiorini, P.

    1998-01-01

    Ths paper proposes two solutions for the control of telerobots, in which master and slave are connected through a communication system that introduces a variable delay. This is the typical case of packet-switched networks (e.g. Internet), in which the delay varies in an unpredictible way.

  2. Pipeline and parallel architectures for computer communication systems

    SciTech Connect

    Reddi, A.V.

    1983-01-01

    Various existing communication precessor systems (CPSS) at different nodes in computer communication systems (CCSS) are reviewed for distributed processing systems. To meet the increasing load of messages, pipeline and parallel architectures are suggested in CPSS. Finally, pipeline, array, multi and multiple-processor architectures and their advantages in CPSS for CCSS are presented and analysed, and their performances are compared with the performance of uniprocessor architecture. 19 references.

  3. 77 FR 51571 - Certain Wireless Communication Devices, Portable Music and Data Processing Devices, Computers...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-24

    ... COMMISSION Certain Wireless Communication Devices, Portable Music and Data Processing Devices, Computers, and.... International Trade Commission has received a complaint entitled Wireless Communication Devices, Portable Music... communication devices, portable music and data processing devices, computers, and components thereof....

  4. 77 FR 58576 - Certain Wireless Communication Devices, Portable Music and Data Processing Devices, Computers...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-21

    ... COMMISSION Certain Wireless Communication Devices, Portable Music and Data Processing Devices, Computers, and... importation of certain wireless communication devices, portable music and data processing devices, computers... after importation of certain wireless communication devices, portable music and data processing...

  5. 78 FR 1247 - Certain Electronic Devices, Including Wireless Communication Devices, Tablet Computers, Media...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-08

    ... COMMISSION Certain Electronic Devices, Including Wireless Communication Devices, Tablet Computers, Media... United States after importation of certain electronic devices, including wireless communication devices... importation of certain electronic devices, including wireless communication devices, tablet computers,...

  6. Simplified Optics and Controls for Laser Communications

    NASA Technical Reports Server (NTRS)

    Chen, Chien-Chung; Hemmati, Hamid

    2006-01-01

    A document discusses an architecture of a spaceborne laser communication system that provides for a simplified control subsystem that stabilizes the line of sight in a desired direction. Heretofore, a typical design for a spaceborne laser communication system has called for a high-bandwidth control loop, a steering mirror and associated optics, and a fast steering-mirror actuator to stabilize the line of sight in the presence of vibrations. In the present architecture, the need for this fast steering-mirror subsystem is eliminated by mounting the laser-communication optics on a disturbance-free platform (DFP) that suppresses coupling of vibrations to the optics by 60 dB. Taking advantage of microgravitation, in the DFP, the optical assembly is free-flying relative to the rest of the spacecraft, and a low-spring-constant pointing control subsystem exerts small forces to regulate the position and orientation of the optics via voice coils. All steering is effected via the DFP, which can be controlled in all six degrees of freedom relative to the spacecraft. A second control loop, closed around a position sensor and the spacecraft attitude-control system, moves the spacecraft as needed to prevent mechanical contact with the optical assembly.

  7. Inter-Vehicle Communication System Utilizing Autonomous Distributed Transmit Power Control

    NASA Astrophysics Data System (ADS)

    Hamada, Yuji; Sawa, Yoshitsugu; Goto, Yukio; Kumazawa, Hiroyuki

    In ad-hoc network such as inter-vehicle communication (IVC) system, safety applications that vehicles broadcast the information such as car velocity, position and so on periodically are considered. In these applications, if there are many vehicles broadcast data in a communication area, congestion incurs a problem decreasing communication reliability. We propose autonomous distributed transmit power control method to keep high communication reliability. In this method, each vehicle controls its transmit power using feed back control. Furthermore, we design a communication protocol to realize the proposed method, and we evaluate the effectiveness of proposed method using computer simulation.

  8. Computer control by hand gestures

    NASA Astrophysics Data System (ADS)

    Jemel, Intidhar; Ejbali, Ridha; Zaied, Mourad

    2015-12-01

    This work fits into the context of the interpretation of automatic gestures based on computer vision. The aim of our work is to transform a conventional screen in a surface that allows the user to use his hands as pointing devices. These can be summarized in three main steps. Hand detection in a video, monitoring detected hands and conversion paths made by the hands to computer commands. To realize this application, it is necessary to detect the hand to follow. A classification phase is essential, at the control part. For this reason, we resorted to the use of a neuro-fuzzy classifier for classification and a pattern matching method for detection.

  9. Crew/computer communications study. Volume 2: Appendixes

    NASA Technical Reports Server (NTRS)

    Johannes, J. D.

    1974-01-01

    The software routines developed during the crew/computer communications study are described to provide the user with an understanding of each routine, any restrictions in use, the required input data, and expected results after executing the routines. The combination of routines to generate a crew/computer communications application is also explained. The programmable keyboard and display used by the program is described, and an experiment scenario is provided to illustrate the relationship between the program frames when they are grouped into activity phases. Program descriptions and a user's guide are also presented. For Vol. 1, see N74-18843.

  10. Common data buffer system. [communication with computational equipment utilized in spacecraft operations

    NASA Technical Reports Server (NTRS)

    Byrne, F. (Inventor)

    1981-01-01

    A high speed common data buffer system is described for providing an interface and communications medium between a plurality of computers utilized in a distributed computer complex forming part of a checkout, command and control system for space vehicles and associated ground support equipment. The system includes the capability for temporarily storing data to be transferred between computers, for transferring a plurality of interrupts between computers, for monitoring and recording these transfers, and for correcting errors incurred in these transfers. Validity checks are made on each transfer and appropriate error notification is given to the computer associated with that transfer.

  11. Simple algorithm for computing the communication complexity of quantum communication processes

    NASA Astrophysics Data System (ADS)

    Hansen, A.; Montina, A.; Wolf, S.

    2016-04-01

    A two-party quantum communication process with classical inputs and outcomes can be simulated by replacing the quantum channel with a classical one. The minimal amount of classical communication required to reproduce the statistics of the quantum process is called its communication complexity. In the case of many instances simulated in parallel, the minimal communication cost per instance is called the asymptotic communication complexity. Previously, we reduced the computation of the asymptotic communication complexity to a convex minimization problem. In most cases, the objective function does not have an explicit analytic form, as the function is defined as the maximum over an infinite set of convex functions. Therefore, the overall problem takes the form of a minimax problem and cannot directly be solved by standard optimization methods. In this paper, we introduce a simple algorithm to compute the asymptotic communication complexity. For some special cases with an analytic objective function one can employ available convex-optimization libraries. In the tested cases our method turned out to be notably faster. Finally, using our method we obtain 1.238 bits as a lower bound on the asymptotic communication complexity of a noiseless quantum channel with the capacity of 1 qubit. This improves the previous bound of 1.208 bits.

  12. Proceedings of the Military Communications System Control Symposium

    NASA Astrophysics Data System (ADS)

    Harris, S.; Heller, J.

    1980-11-01

    Contents: Perspective on Communications System Control, Navy Force Coordination and the Requirements for Communications Network Management, On the Functions of a Network Management Agency, Improved Control and Technical Management of DCS Theater Assets Under Crisis and Wartime Conditions, Survivability Performance of MX Communication System, System Control for the Tactical/Strategic Interface, Tactical Circuit-Switched Network Control, Systems Control in Tactical Digital Communications Systems - a Study in Distributed Control, the NATO III Satellite Communications Control System, Network Control in NATO Integrated Communications Systems - Stage I, Evolution of Control in the Defense Satellite Communication System, System Control Considerations for Next Generation DCS Switches, Evolving Approaches to System control in the Defense Communications Systems(DCS), and Network control and the CRM Make Possible Automated Digital Patching.

  13. Java-based communication in a High Performance Computing environment

    NASA Astrophysics Data System (ADS)

    Fries, A.; de Mora, J. Portell I.; Sirvent, R.

    2011-02-01

    Java is one of the most widely used computer programming languages, however its use in High Performance Computing (HPC) is relatively low. A typical HPC environment consists of a number of multi-core computing nodes, while a typical application running in such an environment will normally contain CPU intensive code that can be executed in parallel. Such an application may require inter-node as well as intra-node communication. Message Passing Interface (MPI) is a language independent specification of an API to allow such communication. MPJExpress (Baker et al. 2006) and F-MPJ (Taboada et al. 2009) are Java-based implementations of MPI, designed with the efficient performance of data transfers as a main objective. In this paper we discuss the scalability of one approach of distributing data to compute nodes in HPC and we propose the design of an alternative data transfer system, building upon MPI.

  14. Computers in geology, geometry, planning, training, communications

    SciTech Connect

    Anderson, D.

    1996-07-01

    The Pittsburgh Research Center (PRC), in partnership with Carnegie Mellon University, is developing a mapping system to obtain two- and three-dimensional geometric information about the mine environment and produce two-dimensional (2-D) mine maps and three-dimensional (3-D) geometric models of mine areas. It is also developing mine visualization systems. In its current stage of development, the sensor and computer hardware can gather 2-D and 3-D data as it is transported about the mine environment. The driver transporting the sensor through the mine need only stop for seconds during each scan, to allow the gimballed mount of the sensor to settle, thereby eliminating errors due to sensor tilt. Post-processing software can compile the geometrical data and construct an extensive 2-D map. The final map is similar to mine maps generated by hand measurements today. However, the resolution and rate at which data are acquired result in maps that are more representative of the true shape of coal pillars, intersections, and corners. The 3-D geometric models are of sufficient resolution to support accurate volumetric calculations, navigation information, and assessment of structural size and conditions.

  15. CICT Computing, Information, and Communications Technology Program

    NASA Technical Reports Server (NTRS)

    Laufenberg, Lawrence; Tu, Eugene (Technical Monitor)

    2002-01-01

    The CICT Program is part of the NASA Aerospace Technology Enterprise's fundamental technology thrust to develop tools. processes, and technologies that enable new aerospace system capabilities and missions. The CICT Program's four key objectives are: Provide seamless access to NASA resources- including ground-, air-, and space-based distributed information technology resources-so that NASA scientists and engineers can more easily control missions, make new scientific discoveries, and design the next-generation space vehicles, provide high-data delivery from these assets directly to users for missions, develop goal-oriented human-centered systems, and research, develop and evaluate revolutionary technology.

  16. The Influence of Future Command, Control, Communications, and Computers (C4) on Doctrine and the Operational Commander's Decision-Making Process

    NASA Technical Reports Server (NTRS)

    Mayer, Michael G.

    1996-01-01

    Future C4 systems will alter the traditional balance between force and information, having a profound influence on doctrine and the operational commander's decision making process. The Joint Staff's future vision of C4 is conceptualized in 'C4I for the Warrior' which envisions a joint C4I architecture providing timely sensor to shoot information direct to the warfighter. C4 system must manage and filter an overwhelming amount of information; deal with interoperability issues; overcome technological limitations; meet emerging security requirements; and protect against 'Information Warfare.' Severe budget constraints necessitate unified control of C4 systems under singular leadership for the common good of all the services. In addition, acquisition policy and procedures must be revamped to allow new technologies to be fielded quickly; and the commercial marketplace will become the preferred starting point for modernization. Flatter command structures are recommended in this environment where information is available instantaneously. New responsibilities for decision making at lower levels are created. Commanders will have to strike a balance between exerting greater control and allowing subordinates enough flexibility to maintain initiative. Clearly, the commander's intent remains the most important tool in striking this balance.

  17. Application of Soft Computing in Coherent Communications Phase Synchronization

    NASA Technical Reports Server (NTRS)

    Drake, Jeffrey T.; Prasad, Nadipuram R.

    2000-01-01

    The use of soft computing techniques in coherent communications phase synchronization provides an alternative to analytical or hard computing methods. This paper discusses a novel use of Adaptive Neuro-Fuzzy Inference Systems (ANFIS) for phase synchronization in coherent communications systems utilizing Multiple Phase Shift Keying (MPSK) modulation. A brief overview of the M-PSK digital communications bandpass modulation technique is presented and it's requisite need for phase synchronization is discussed. We briefly describe the hybrid platform developed by Jang that incorporates fuzzy/neural structures namely the, Adaptive Neuro-Fuzzy Interference Systems (ANFIS). We then discuss application of ANFIS to phase estimation for M-PSK. The modeling of both explicit, and implicit phase estimation schemes for M-PSK symbols with unknown structure are discussed. Performance results from simulation of the above scheme is presented.

  18. SpecialNet. A National Computer-Based Communications Network.

    ERIC Educational Resources Information Center

    Morin, Alfred J.

    1986-01-01

    "SpecialNet," a computer-based communications network for educators at all administrative levels, has been established and is managed by National Systems Management, Inc. Users can send and receive electronic mail, share information on electronic bulletin boards, participate in electronic conferences, and send reports and other documents to each…

  19. High Performance Computing and Communications: Toward a National Information Infrastructure.

    ERIC Educational Resources Information Center

    Federal Coordinating Council for Science, Engineering and Technology, Washington, DC.

    This report describes the High Performance Computing and Communications (HPCC) initiative of the Federal Coordinating Council for Science, Engineering, and Technology. This program is supportive of and coordinated with the National Information Infrastructure Initiative. Now halfway through its 5-year effort, the HPCC program counts among its…

  20. Organizational Alternatives for a Pacific Educational Computer-Communications Network.

    ERIC Educational Resources Information Center

    Ah Mai, Karen L.

    Organizational alternatives for a Pacific educational computer-communications network are studied through the examples provided by other networks. A survey of networks is provided with a discussion of the history and development of networks and the distinctions in network technology and applications. Nine specific networks are described. Libraries…

  1. The Performance of Humor in Computer-Mediated Communication.

    ERIC Educational Resources Information Center

    Baym, Nancy

    1995-01-01

    Argues that humor can be accomplished in computer-mediated communication and can be critical to creating social meaning online. Analyzes the humor of the USENET news group rec.arts.tv.soaps (r.a.t.s.), which discusses soap operas. Combines user surveys with message analysis to show the prevalence and importance of humor in r.a.t.s. (RS)

  2. Self Esteem and Self Reference in Computer Mediated Communication.

    ERIC Educational Resources Information Center

    Koehler, T.; Trimpop, R.

    This study focused on explaining the social character of text-based computer mediated communication (CMC), focusing on the outcomes of self esteem and "self reference." Subjects were 200 undergraduate students of a German university. Three perspectives of CMC were compared in this study: CMC as an impersonal situation, via mediated small groups,…

  3. Computer Programs for Technical Communicators: The Compelling Curriculum. Working Draft.

    ERIC Educational Resources Information Center

    Selfe, Cynthia L.; Wahlstrom, Billie J.

    A series of computer programs have been developed at Michigan Technological University for use with technical writing and technical communications classes. The first type of program in the series, CURIE II, includes process-based modules, each of which corresponds to one of the following assignments: memoranda, resumes, feasibility reports,…

  4. MPWide: Light-weight communication library for distributed computing

    NASA Astrophysics Data System (ADS)

    Groen, Derek; Rieder, Steven; Grosso, Paola; de Laat, Cees; Portegies Zwart, Simon

    2012-12-01

    MPWide is a light-weight communication library for distributed computing. It is specifically developed to allow message passing over long-distance networks using path-specific optimizations. An early version of MPWide was used in the Gravitational Billion Body Project to allow simulations across multiple supercomputers.

  5. The New Orality: Oral Characteristics of Computer-Mediated Communication.

    ERIC Educational Resources Information Center

    Ferris, Sharmila Pixy; Montgomery, Maureen

    1996-01-01

    Considers the characteristics of orality and literacy developed in the work of scholars such as Walter Ong to consider computer-mediated communication (CMC) as the potential site of a "new orality" which is neither purely oral or literate. Notes that the medium of CMC is writing, which has traditionally represented the "literate," while the…

  6. Connecting Minds: Computer-Mediated Communication and Scientific Work.

    ERIC Educational Resources Information Center

    Walsh, John P.; Kucker, Stephanie; Maloney, Nancy G.; Gabbay, Shaul

    2000-01-01

    Summarizes the preliminary findings from a recent study of scientists in four disciplines with regard to computer-mediated communication (CMC) use and effects. Findings from surveys of 333 scientists indicate that CMC use is central to both professional and research-related aspects of scientific work, and that this use differs by field. CMC use is…

  7. Language Use in Asynchronous Computer-Mediated Communication in Taiwan

    ERIC Educational Resources Information Center

    Huang, Daphne Li-jung

    2009-01-01

    This paper describes how Chinese-English bilinguals in Taiwan use their languages in asynchronous computer-mediated communication, specifically, via Bulletin Board System (BBS) and email. The main data includes two types: emails collected from a social network and postings collected from two BBS websites. By examining patterns of language choice…

  8. The Influence of Computer-Mediated Communication Systems on Community

    ERIC Educational Resources Information Center

    Rockinson-Szapkiw, Amanda J.

    2012-01-01

    As higher education institutions enter the intense competition of the rapidly growing global marketplace of online education, the leaders within these institutions are challenged to identify factors critical for developing and for maintaining effective online courses. Computer-mediated communication (CMC) systems are considered critical to…

  9. Review of Computer Mediated Communication Research for Education

    ERIC Educational Resources Information Center

    Luppicini, Rocci

    2007-01-01

    This research review examines recent developments in computer-mediated communication (CMC) research for educational applications. The review draws on 170 recent research articles selected from 78 journals representing a wide range of disciplines. The review focuses on peer-reviewed empirical studies, but is open to a variety of methodologies. The…

  10. Using Computer-Mediated Communication (CMC) in Language Teaching

    ERIC Educational Resources Information Center

    Goertler, Senta

    2009-01-01

    This article discusses how new and familiar computer technology tools can be used in a communicative language classroom. It begins by outlining the benefits and challenges of using such technology for language teaching in general, and it describes some sample activities that the author has used. Readers are shown how to implement various computer…

  11. Implementing Computer Mediated Communication in the College Classroom.

    ERIC Educational Resources Information Center

    Clay-Warner, Jody; Marsh, Kristin

    2000-01-01

    Examines the use of computer-mediated communication (CMC) in the college classroom using survey data from 89 undergraduate sociology students. Discusses advantages and disadvantages of conferencing systems, either through local area networks or Internet-based systems; preferred uses of CMC; and results of regression analyses. (Author/LRW)

  12. Computer-Aided Communication Satellite System Analysis and Optimization.

    ERIC Educational Resources Information Center

    Stagl, Thomas W.; And Others

    Various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. The rationale for selecting General Dynamics/Convair's Satellite Telecommunication Analysis and Modeling Program (STAMP) in modified form to aid in the system costing and sensitivity analysis work in the Program on…

  13. A Diagnostic Study of Computer Application of Structural Communication Grid

    ERIC Educational Resources Information Center

    Bahar, Mehmet; Aydin, Fatih; Karakirik, Erol

    2009-01-01

    In this article, Structural communication grid (SCG), an alternative measurement and evaluation technique, has been firstly summarised and the design, development and implementation of a computer based SCG system have been introduced. The system is then tested on a sample of 154 participants consisting of candidate students, science teachers and…

  14. Controlled Bidirectional Quantum Secure Direct Communication

    PubMed Central

    Chou, Yao-Hsin; Lin, Yu-Ting; Zeng, Guo-Jyun; Lin, Fang-Jhu; Chen, Chi-Yuan

    2014-01-01

    We propose a novel protocol for controlled bidirectional quantum secure communication based on a nonlocal swap gate scheme. Our proposed protocol would be applied to a system in which a controller (supervisor/Charlie) controls the bidirectional communication with quantum information or secret messages between legitimate users (Alice and Bob). In this system, the legitimate users must obtain permission from the controller in order to exchange their respective quantum information or secret messages simultaneously; the controller is unable to obtain any quantum information or secret messages from the decoding process. Moreover, the presence of the controller also avoids the problem of one legitimate user receiving the quantum information or secret message before the other, and then refusing to help the other user decode the quantum information or secret message. Our proposed protocol is aimed at protecting against external and participant attacks on such a system, and the cost of transmitting quantum bits using our protocol is less than that achieved in other studies. Based on the nonlocal swap gate scheme, the legitimate users exchange their quantum information or secret messages without transmission in a public channel, thus protecting against eavesdroppers stealing the secret messages. PMID:25006596

  15. Computing, information, and communications: Technologies for the 21. Century

    SciTech Connect

    1998-11-01

    To meet the challenges of a radically new and technologically demanding century, the Federal Computing, Information, and Communications (CIC) programs are investing in long-term research and development (R and D) to advance computing, information, and communications in the United States. CIC R and D programs help Federal departments and agencies to fulfill their evolving missions, assure the long-term national security, better understand and manage the physical environment, improve health care, help improve the teaching of children, provide tools for lifelong training and distance learning to the workforce, and sustain critical US economic competitiveness. One of the nine committees of the National Science and Technology Council (NSTC), the Committee on Computing, Information, and Communications (CCIC)--through its CIC R and D Subcommittee--coordinates R and D programs conducted by twelve Federal departments and agencies in cooperation with US academia and industry. These R and D programs are organized into five Program Component Areas: (1) HECC--High End Computing and Computation; (2) LSN--Large Scale Networking, including the Next Generation Internet Initiative; (3) HCS--High Confidence Systems; (4) HuCS--Human Centered Systems; and (5) ETHR--Education, Training, and Human Resources. A brief synopsis of FY 1997 accomplishments and FY 1998 goals by PCA is presented. This report, which supplements the President`s Fiscal Year 1998 Budget, describes the interagency CIC programs.

  16. High performance computing and communications: FY 1996 implementation plan

    SciTech Connect

    1995-05-16

    The High Performance Computing and Communications (HPCC) Program was formally authorized by passage of the High Performance Computing Act of 1991, signed on December 9, 1991. Twelve federal agencies, in collaboration with scientists and managers from US industry, universities, and research laboratories, have developed the Program to meet the challenges of advancing computing and associated communications technologies and practices. This plan provides a detailed description of the agencies` HPCC implementation plans for FY 1995 and FY 1996. This Implementation Plan contains three additional sections. Section 3 provides an overview of the HPCC Program definition and organization. Section 4 contains a breakdown of the five major components of the HPCC Program, with an emphasis on the overall directions and milestones planned for each one. Section 5 provides a detailed look at HPCC Program activities within each agency.

  17. Communication-efficient parallel architectures and algorithms for image computations

    SciTech Connect

    Alnuweiri, H.M.

    1989-01-01

    The main purpose of this dissertation is the design of efficient parallel techniques for image computations which require global operations on image pixels, as well as the development of parallel architectures with special communication features which can support global data movement efficiently. The class of image problems considered in this dissertation involves global operations on image pixels, and irregular (data-dependent) data movement operations. Such problems include histogramming, component labeling, proximity computations, computing the Hough Transform, computing convexity of regions and related properties such as computing the diameter and a smallest area enclosing rectangle for each region. Images with multiple figures and multiple labeled-sets of pixels are also considered. Efficient solutions to such problems involve integer sorting, graph theoretic techniques, and techniques from computational geometry. Although such solutions are not computationally intensive (they all require O(n{sup 2}) operations to be performed on an n {times} n image), they require global communications. The emphasis here is on developing parallel techniques for data movement, reduction, and distribution, which lead to processor-time optimal solutions for such problems on the proposed organizations. The proposed parallel architectures are based on a memory array which can be viewed as an arrangement of memory modules in a k-dimensional space such that the modules are connected to buses placed parallel to the orthogonal axes of the space, and each bus is connected to one processor or a group of processors. It will be shown that such organizations are communication-efficient and are thus highly suited to the image problems considered here, and also to several other classes of problems. The proposed organizations have p processors and O(n{sup 2}) words of memory to process n {times} n images.

  18. 47 CFR 90.465 - Control of systems of communication.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Control of systems of communication. 90.465 Section 90.465 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES Transmitter Control § 90.465 Control of systems of communication. (a) Depending on design...

  19. Multiparty Controlled Deterministic Secure Quantum Communication Through Entanglement Swapping

    NASA Astrophysics Data System (ADS)

    Dong, Li; Xiu, Xiao-Ming; Gao, Ya-Jun; Chi, Feng

    A three-party controlled deterministic secure quantum communication scheme through entanglement swapping is proposed firstly. In the scheme, the sender needs to prepare a class of Greenberger-Horne-Zeilinger (GHZ) states which are used as quantum channel. The two communicators may securely communicate under the control of the controller if the quantum channel is safe. The roles of the sender, the receiver, and the controller can be exchanged owing to the symmetry of the quantum channel. Different from other controlled quantum secure communication schemes, the scheme needs lesser additional classical information for transferring secret information. Finally, it is generalized to a multiparty controlled deterministic secure quantum communication scheme.

  20. DNET: A communications facility for distributed heterogeneous computing

    NASA Technical Reports Server (NTRS)

    Tole, John; Nagappan, S.; Clayton, J.; Ruotolo, P.; Williamson, C.; Solow, H.

    1989-01-01

    This document describes DNET, a heterogeneous data communications networking facility. DNET allows programs operating on hosts on dissimilar networks to communicate with one another without concern for computer hardware, network protocol, or operating system differences. The overall DNET network is defined as the collection of host machines/networks on which the DNET software is operating. Each underlying network is considered a DNET 'domain'. Data communications service is provided between any two processes on any two hosts on any of the networks (domains) that may be reached via DNET. DNET provides protocol transparent, reliable, streaming data transmission between hosts (restricted, initially to DECnet and TCP/IP networks). DNET also provides variable length datagram service with optional return receipts.

  1. Monitoring and Modeling Performance of Communications in Computational Grids

    NASA Technical Reports Server (NTRS)

    Frumkin, Michael A.; Le, Thuy T.

    2003-01-01

    Computational grids may include many machines located in a number of sites. For efficient use of the grid we need to have an ability to estimate the time it takes to communicate data between the machines. For dynamic distributed grids it is unrealistic to know exact parameters of the communication hardware and the current communication traffic and we should rely on a model of the network performance to estimate the message delivery time. Our approach to a construction of such a model is based on observation of the messages delivery time with various message sizes and time scales. We record these observations in a database and use them to build a model of the message delivery time. Our experiments show presence of multiple bands in the logarithm of the message delivery times. These multiple bands represent multiple paths messages travel between the grid machines and are incorporated in our multiband model.

  2. Computer-aided communication satellite system analysis and optimization

    NASA Technical Reports Server (NTRS)

    Stagl, T. W.; Morgan, N. H.; Morley, R. E.; Singh, J. P.

    1973-01-01

    The capabilities and limitations of the various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. A satellite Telecommunication analysis and Modeling Program (STAMP) for costing and sensitivity analysis work in application of communication satellites to educational development is given. The modifications made to STAMP include: extension of the six beam capability to eight; addition of generation of multiple beams from a single reflector system with an array of feeds; an improved system costing to reflect the time value of money, growth in earth terminal population with time, and to account for various measures of system reliability; inclusion of a model for scintillation at microwave frequencies in the communication link loss model; and, an updated technological environment.

  3. Efficient Controlled Quantum Secure Direct Communication Protocols

    NASA Astrophysics Data System (ADS)

    Patwardhan, Siddharth; Moulick, Subhayan Roy; Panigrahi, Prasanta K.

    2016-03-01

    We study controlled quantum secure direct communication (CQSDC), a cryptographic scheme where a sender can send a secret bit-string to an intended recipient, without any secure classical channel, who can obtain the complete bit-string only with the permission of a controller. We report an efficient protocol to realize CQSDC using Cluster state and then go on to construct a (2-3)-CQSDC using Brown state, where a coalition of any two of the three controllers is required to retrieve the complete message. We argue both protocols to be unconditionally secure and analyze the efficiency of the protocols to show it to outperform the existing schemes while maintaining the same security specifications.

  4. Efficient Controlled Quantum Secure Direct Communication Protocols

    NASA Astrophysics Data System (ADS)

    Patwardhan, Siddharth; Moulick, Subhayan Roy; Panigrahi, Prasanta K.

    2016-07-01

    We study controlled quantum secure direct communication (CQSDC), a cryptographic scheme where a sender can send a secret bit-string to an intended recipient, without any secure classical channel, who can obtain the complete bit-string only with the permission of a controller. We report an efficient protocol to realize CQSDC using Cluster state and then go on to construct a (2-3)-CQSDC using Brown state, where a coalition of any two of the three controllers is required to retrieve the complete message. We argue both protocols to be unconditionally secure and analyze the efficiency of the protocols to show it to outperform the existing schemes while maintaining the same security specifications.

  5. High performance computing and communications: FY 1997 implementation plan

    SciTech Connect

    1996-12-01

    The High Performance Computing and Communications (HPCC) Program was formally authorized by passage, with bipartisan support, of the High-Performance Computing Act of 1991, signed on December 9, 1991. The original Program, in which eight Federal agencies participated, has now grown to twelve agencies. This Plan provides a detailed description of the agencies` FY 1996 HPCC accomplishments and FY 1997 HPCC plans. Section 3 of this Plan provides an overview of the HPCC Program. Section 4 contains more detailed definitions of the Program Component Areas, with an emphasis on the overall directions and milestones planned for each PCA. Appendix A provides a detailed look at HPCC Program activities within each agency.

  6. Estimating computer communication network performance using network simulations

    SciTech Connect

    Garcia, A.B.

    1985-01-01

    A generalized queuing model simulation of store-and-forward computer communication networks is developed and implemented using Simulation Language for Alternative Modeling (SLAM). A baseline simulation model is validated by comparison with published analytic models. The baseline model is expanded to include an ACK/NAK data link protocol, four-level message precedence, finite queues, and a response traffic scenario. Network performance, as indicated by average message delay and message throughput, is estimated using the simulation model.

  7. The effects of hands free communication devices on clinical communication: balancing communication access needs with user control.

    PubMed

    Richardson, Joshua E; Richardson, Joshua Edwin; Ash, Joan S; Ash, Joan

    2008-01-01

    Hands Free Communication Device (HFCD) systems are a relatively new information and communication technology. HFCD systems enable clinicians to directly contact and communicate with one another using wearable, voice-controlled badges that are VoIP-based (voice-over IP) and are linked to one another over a wireless local area network (WLAN). This qualitative study utilized a grounded theory, multiple perspectives approach to understand how the use of HFCDs affected communication in the hospitals that implemented them. The study generated five themes revolving around HFCDs impact on communication. This paper specifically focuses on two of those themes: Communication Access and Control. PMID:18999046

  8. Communications and control for electric power systems

    NASA Technical Reports Server (NTRS)

    Kirkham, H.; Goettsche, A.; Niebur, D.; Friend, H.; Johnston, A.

    1991-01-01

    The first section of the report describes the AbNET system, a hardware and software communications system designed for distribution automation (it can also find application in substation monitoring and control). The topology of the power system fixes the topology of the communications network, which can therefore be expected to include a larger number of branch points, tap points, and interconnections. These features make this communications network unlike any other. The network operating software has to solve the problem of communicating to all the nodes of a very complex network in as reliable a way as possible even if the network is damaged, and it has to do so with minimum transmission delays and at minimum cost. The design of the operating protocols is described within the framework of the seven-layer Open System Interconnection hierarchy of the International Standards Organization. Section 2 of the report describes the development and testing of a high voltage sensor based on an electro-optic polymer. The theory of operation is reviewed. Bulk fabrication of the polymer is discussed, as well as results of testing of the electro-optic coefficient of the material. Fabrication of a complete prototype sensor suitable for use in the range 1-20 kV is described. The electro-optic polymer is shown to be an important material for fiber optic sensing applications. Appendix A is theoretical support for this work. The third section of the report presents the application of an artificial neural network, Kohonen's self-organizing feature map, for the classification of power system states. This classifier maps vectors of an N-dimensional space to a 2-dimensional neural net in a nonlinear way preserving the topological order of the input vectors. These mappings are studied using a nonlinear power system model.

  9. Radio Synthesis Imaging - A High Performance Computing and Communications Project

    NASA Astrophysics Data System (ADS)

    Crutcher, Richard M.

    The National Science Foundation has funded a five-year High Performance Computing and Communications project at the National Center for Supercomputing Applications (NCSA) for the direct implementation of several of the computing recommendations of the Astronomy and Astrophysics Survey Committee (the "Bahcall report"). This paper is a summary of the project goals and a progress report. The project will implement a prototype of the next generation of astronomical telescope systems - remotely located telescopes connected by high-speed networks to very high performance, scalable architecture computers and on-line data archives, which are accessed by astronomers over Gbit/sec networks. Specifically, a data link has been installed between the BIMA millimeter-wave synthesis array at Hat Creek, California and NCSA at Urbana, Illinois for real-time transmission of data to NCSA. Data are automatically archived, and may be browsed and retrieved by astronomers using the NCSA Mosaic software. In addition, an on-line digital library of processed images will be established. BIMA data will be processed on a very high performance distributed computing system, with I/O, user interface, and most of the software system running on the NCSA Convex C3880 supercomputer or Silicon Graphics Onyx workstations connected by HiPPI to the high performance, massively parallel Thinking Machines Corporation CM-5. The very computationally intensive algorithms for calibration and imaging of radio synthesis array observations will be optimized for the CM-5 and new algorithms which utilize the massively parallel architecture will be developed. Code running simultaneously on the distributed computers will communicate using the Data Transport Mechanism developed by NCSA. The project will also use the BLANCA Gbit/s testbed network between Urbana and Madison, Wisconsin to connect an Onyx workstation in the University of Wisconsin Astronomy Department to the NCSA CM-5, for development of long

  10. Telerobotics - Display, control, and communication problems

    NASA Technical Reports Server (NTRS)

    Stark, Lawrence; Kim, Won-Soo; Tendick, Frank; Hannaford, Blake; Ellis, Stephen

    1987-01-01

    An experimental telerobotics simulation is described suitable for studying human operator (HO) performance. Simple manipulator pick-and-place and tracking tasks allowed quantitative comparison of a number of calligraphic display viewing conditions. An enhanced perspective display was effective with a reference line from target to base, with or without a complex three-dimensional grid framing the view. This was true especially if geometrical display parameters such as azimuth and elevation were arranged to be near optimal. Quantitative comparisons were made possible, utilizing control performance measures such as root mean square error. There was a distinct preference for controlling the manipulator in end-effector Cartesian space for the primitive pick-and-place task, rather than controlling joint angles and then, via direct kinematis, the end-effector position. An introduced communication delay was found to produce decrease in performance. In considerable part, this difficulty could be compensated for by preview control information. The fact that neurological control of normal human movement contains a sampled data period of 0.2 s may relate to this robustness of HO control to delay.

  11. Results of computer network experiment via the Japanese communication satellite CS - Performance evaluation of communication protocols

    NASA Astrophysics Data System (ADS)

    Ito, A.; Kakinuma, Y.; Uchida, K.; Matsumoto, K.; Takahashi, H.

    1984-03-01

    Computer network experiments have been performed by using the Japanese communication satellite CS. The network is of a centralized (star) type, consisting of one center station and many user stations. The protocols are determined taking into consideration the long round trip delay of a satellite channel. This paper treats the communication protocol aspects of the experiments. Performances of the burst level and the link protocols (which correspond nearly to data link layer of OSI 7 layer model) are evaluated. System performances of throughput, delay, link level overhead are measured by using the statistically generated traffic.

  12. Science and society: the communications revolution and cancer control.

    PubMed

    Viswanath, K

    2005-10-01

    Advances in communications technology, particularly with regards to computer-based media, have opened up exciting possibilities to intervene and influence the trajectory of cancer control, from disease prevention to survivorship, and to reduce the cancer burden. The resulting explosion in cancer information in the mass media and on the Internet, however, also offers challenges in terms of equality in access to information and the ability to act on it, as well as in making sure that it is accurate, readily available and easy to use. PMID:16195753

  13. An Examination of the Characteristics of Student Interaction in Computer-Based Communication Assignments.

    ERIC Educational Resources Information Center

    Brown, Susan A.; Vician, Chelley

    Student interaction and computer-based communication tool appropriation patterns were examined in two different communication assignments requiring active use of computer-based communication tools. University students completed either: a set of communication assignments and activities with the instructor as sole audience; or a set of communication…

  14. Ways of and Gains from Foreign Communication through Computer in China's College Bilingual Teaching

    NASA Astrophysics Data System (ADS)

    Gong, Ailing; Liu, Tingrui; Liu, Yan

    Foreign communication is very important in china's college bilingual education since the original textbook written in English is adapted for teaching. Foreign communication through computer is affordable to many instructors. Based on teaching practices, the paper introduces ways of foreign communication through computer in bilingual teaching and summarizes gains from the communication.

  15. Computer simulation of digital signal modulation techniques in satellite communications

    NASA Astrophysics Data System (ADS)

    Carlson, C. D.

    1985-09-01

    Tutorial on digital signal modulation techniques used in satellite communications is presented and includes computer simulation of those digital signal modulation techniques introduced. The purpose is to introduce digital signal modulation techniques and through the use of computer simulation, generate statistics which represent the characteristics of the FFT for the respective signal type. Further, an analysis of the statistics of the FFT's is conducted to determine if there is any relationship between the components of the FFT of the different signals. The statistic used to investigate this possible relationship is the F-distribution. The computer simulation is written and conducted in the FORTRAN programming language. A copy of the program, results of the simulation and the statistical analysis conducted are included in the appendices.

  16. Data communications in a parallel active messaging interface of a parallel computer

    DOEpatents

    Archer, Charles J; Blocksome, Michael A; Ratterman, Joseph D; Smith, Brian E

    2013-11-12

    Data communications in a parallel active messaging interface (`PAMI`) of a parallel computer composed of compute nodes that execute a parallel application, each compute node including application processors that execute the parallel application and at least one management processor dedicated to gathering information regarding data communications. The PAMI is composed of data communications endpoints, each endpoint composed of a specification of data communications parameters for a thread of execution on a compute node, including specifications of a client, a context, and a task, the compute nodes and the endpoints coupled for data communications through the PAMI and through data communications resources. Embodiments function by gathering call site statistics describing data communications resulting from execution of data communications instructions and identifying in dependence upon the call cite statistics a data communications algorithm for use in executing a data communications instruction at a call site in the parallel application.

  17. Computer-Controlled, Motorized Positioning System

    NASA Technical Reports Server (NTRS)

    Vargas-Aburto, Carlos; Liff, Dale R.

    1994-01-01

    Computer-controlled, motorized positioning system developed for use in robotic manipulation of samples in custom-built secondary-ion mass spectrometry (SIMS) system. Positions sample repeatably and accurately, even during analysis in three linear orthogonal coordinates and one angular coordinate under manual local control, or microprocessor-based local control or remote control by computer via general-purpose interface bus (GPIB).

  18. Computer controlled thermal fatigue test system

    SciTech Connect

    Schmale, D.T.; Jones, W.B.

    1986-01-01

    A servo-controlled hydraulic mechanical test system has been configured to conduct computer-controlled thermal fatigue tests. The system uses induction heating, a digital temperature controller, infrared pyrometry, forced air cooling, and quartz rod extensometry. In addition, a digital computer controls the tests and allows precise data analysis and interpretation.

  19. A secure communications infrastructure for high-performance distributed computing

    SciTech Connect

    Foster, I.; Koenig, G.; Tuecke, S.

    1997-08-01

    Applications that use high-speed networks to connect geographically distributed supercomputers, databases, and scientific instruments may operate over open networks and access valuable resources. Hence, they can require mechanisms for ensuring integrity and confidentially of communications and for authenticating both users and resources. Security solutions developed for traditional client-server applications do not provide direct support for the program structures, programming tools, and performance requirements encountered in these applications. The authors address these requirements via a security-enhanced version of the Nexus communication library; which they use to provide secure versions of parallel libraries and languages, including the Message Passing Interface. These tools permit a fine degree of control over what, where, and when security mechanisms are applied. In particular, a single application can mix secure and nonsecure communication, allowing the programmer to make fine-grained security/performance tradeoffs. The authors present performance results that quantify the performance of their infrastructure.

  20. 10 CFR 73.54 - Protection of digital computer and communication systems and networks.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 2 2010-01-01 2010-01-01 false Protection of digital computer and communication systems... computer and communication systems and networks. By November 23, 2009 each licensee currently licensed to... provide high assurance that digital computer and communication systems and networks are...

  1. 10 CFR 73.54 - Protection of digital computer and communication systems and networks.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 2 2012-01-01 2012-01-01 false Protection of digital computer and communication systems... computer and communication systems and networks. By November 23, 2009 each licensee currently licensed to... provide high assurance that digital computer and communication systems and networks are...

  2. 10 CFR 73.54 - Protection of digital computer and communication systems and networks.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 2 2014-01-01 2014-01-01 false Protection of digital computer and communication systems... computer and communication systems and networks. By November 23, 2009 each licensee currently licensed to... provide high assurance that digital computer and communication systems and networks are...

  3. 10 CFR 73.54 - Protection of digital computer and communication systems and networks.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 2 2011-01-01 2011-01-01 false Protection of digital computer and communication systems... computer and communication systems and networks. By November 23, 2009 each licensee currently licensed to... provide high assurance that digital computer and communication systems and networks are...

  4. 10 CFR 73.54 - Protection of digital computer and communication systems and networks.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 2 2013-01-01 2013-01-01 false Protection of digital computer and communication systems... computer and communication systems and networks. By November 23, 2009 each licensee currently licensed to... provide high assurance that digital computer and communication systems and networks are...

  5. Computers and quality control in nuclear medicine.

    PubMed

    Brookeman, V A

    1978-04-01

    The general topic of computers and nuclear medicine quality control may be approached from two main areas; controlling the quality of computerized studies, and computer applications in general nuclear medicine quality control. Overlap occurs when quality control of computer studies is performed by the computer itself. The uses of computers in record-keeping and in quality control of imaging instrumentation and in vitro studies, including radioimmunoassay, are discussed in this review. Aspects of quality control for computerized clinical cardiovascular, cerebral, and renal studies and emission computed tomography are reviewed, including consideration of difficulties and inaccuracies involved in the studies. Any automatic computer analysis program should incorporate adequate checks and error detection protocols and should illustrate results for verification. Current routine quality control procedures using the computer unfortunately are few. Quality control criteria are needed for camera/computer systems in high count rate clinical applications, and increasing emphasis should be aimed at quality control of those computerized dynamic and function studies in current clinical use. The computer has a valuable potential for nuclear medicine quality control. In vitro and computerized in vivo studies can be analyzed by readily available statistical programs, and variances can be monitored continuously. Computers can calibrate and monitor instrument performance regularly, and can handle managerial and clerical duties such as bookkeeping. PMID:684439

  6. Control and Power in Educational Computing.

    ERIC Educational Resources Information Center

    Kahn, Peter H., Jr.; Friedman, Batya

    Educational computing based on the primacy of human agency is explored, considering ways in which power can be apportioned and exercised in order to enhance educational computing. Ideas about power and control are situated epistemologically. A first consideration is educating for human control of computer technology. Research suggests that…

  7. Computer Aided Control System Design (CACSD)

    NASA Technical Reports Server (NTRS)

    Stoner, Frank T.

    1993-01-01

    The design of modern aerospace systems relies on the efficient utilization of computational resources and the availability of computational tools to provide accurate system modeling. This research focuses on the development of a computer aided control system design application which provides a full range of stability analysis and control design capabilities for aerospace vehicles.

  8. Computer Instructional Aids for Undergraduate Control Education.

    ERIC Educational Resources Information Center

    Volz, Richard A.; And Others

    Engineering is coming to rely more and more heavily upon the computer for computations, analyses, and graphic displays which aid the design process. A general purpose simulation system, the Time-shared Automatic Control Laboratory (TACL), and a set of computer-aided design programs, Control Oriented Interactive Graphic Analysis and Design…

  9. A doubly logarithmic communication algorithm for the Completely Connected Optical Communication Parallel Computer

    SciTech Connect

    Goldberg, L.A.; Jerrum, M.; Leighton, T.; Rao, S.

    1993-01-20

    In this paper we consider the problem of interprocessor communication on a Completely Connected Optical Communication Parallel Computer (OCPC). The particular problem we study is that of realizing an h-relation. In this problem, each processor has at most h messages to send and at most h messages to receive. It is clear that any 1-relation can be realized in one communication step on an OCPC. However, the best known p-processor OCPC algorithm for realizing an arbitrary h-relation for h > 1 requires {Theta}(h + log p) expected communication steps. (This algorithm is due to Valiant and is based on earlier work of Anderson and Miller.) Valiant`s algorithm is optimal only for h = {Omega}(log p) and it is an open question of Gereb-Graus and Tsantilas whether there is a faster algorithm for h = o(log p). In this paper we answer this question in the affirmative by presenting a {Theta} (h + log log p) communication step algorithm that realizes an arbitrary h-relation on a p-processor OCPC. We show that if h {le} log p then the failure probability can be made as small as p{sup -{alpha}} for any positive constant {alpha}.

  10. High performance computing and communications: FY 1995 implementation plan

    SciTech Connect

    1994-04-01

    The High Performance Computing and Communications (HPCC) Program was formally established following passage of the High Performance Computing Act of 1991 signed on December 9, 1991. Ten federal agencies in collaboration with scientists and managers from US industry, universities, and laboratories have developed the HPCC Program to meet the challenges of advancing computing and associated communications technologies and practices. This plan provides a detailed description of the agencies` HPCC implementation plans for FY 1994 and FY 1995. This Implementation Plan contains three additional sections. Section 3 provides an overview of the HPCC Program definition and organization. Section 4 contains a breakdown of the five major components of the HPCC Program, with an emphasis on the overall directions and milestones planned for each one. Section 5 provides a detailed look at HPCC Program activities within each agency. Although the Department of Education is an official HPCC agency, its current funding and reporting of crosscut activities goes through the Committee on Education and Health Resources, not the HPCC Program. For this reason the Implementation Plan covers nine HPCC agencies.

  11. Voice over IP: how computing technology is being used in mobile communications.

    PubMed

    Johnson, William

    2005-01-01

    This article explains how computing technology was used to address the need for mobile communications among nursing staff. In 2004, nursing staff at Fauquier Hospital relocated from one nursing floor in an older building to two floors in a new structure. This resulted in complaints and supervision issues as nursing managers, who had previously been relatively sedentary, now became quite mobile as they attempted to control nursing operations on two separate floors. Complaints arose from several sources. Nursing staff and managers both complained about the increased difficulty in communicating with each other Physicians expressed frustration to hospital administration at playing "telephone tag" with managers. The solution involved Internet Protocol technology that is in widespread use on most computer networks. The article details how this technology was selected over several other communications technologies and used to implement wireless telephony over the hospital's existing computer network. It reviews key standards and technologies and issues surrounding their use. Finally, the article demonstrates how this computing technology improved patient care by facilitating mobile communications. PMID:16266029

  12. Low latency, high bandwidth data communications between compute nodes in a parallel computer

    DOEpatents

    Archer, Charles J.; Blocksome, Michael A.; Ratterman, Joseph D.; Smith, Brian E.

    2010-11-02

    Methods, parallel computers, and computer program products are disclosed for low latency, high bandwidth data communications between compute nodes in a parallel computer. Embodiments include receiving, by an origin direct memory access (`DMA`) engine of an origin compute node, data for transfer to a target compute node; sending, by the origin DMA engine of the origin compute node to a target DMA engine on the target compute node, a request to send (`RTS`) message; transferring, by the origin DMA engine, a predetermined portion of the data to the target compute node using memory FIFO operation; determining, by the origin DMA engine whether an acknowledgement of the RTS message has been received from the target DMA engine; if the an acknowledgement of the RTS message has not been received, transferring, by the origin DMA engine, another predetermined portion of the data to the target compute node using a memory FIFO operation; and if the acknowledgement of the RTS message has been received by the origin DMA engine, transferring, by the origin DMA engine, any remaining portion of the data to the target compute node using a direct put operation.

  13. Distributed Energy Communications & Controls, Lab Activities - Summary

    SciTech Connect

    Rizy, D Tom

    2010-01-01

    The purpose is to develop controls for inverter-based renewable and non-renewable distributed energy systems to provide local voltage, power and power quality support for loads and the power grid. The objectives are to (1) develop adaptive controls for inverter-based distributed energy (DE) systems when there are multiple inverters on the same feeder and (2) determine the impact of high penetration high seasonal energy efficiency ratio (SEER) air conditioning (A/C) units on power systems during sub-transmission faults which can result in an A/C compressor motor stall and assess how inverter-based DE can help to mitigate the stall event. The Distributed Energy Communications & Controls Laboratory (DECC) is a unique facility for studying dynamic voltage, active power (P), non-active power (Q) and power factor control from inverter-based renewable distributed energy (DE) resources. Conventionally, inverter-based DE systems have been designed to provide constant, close to unity power factor and thus not provide any voltage support. The DECC Lab interfaces with the ORNL campus distribution system to provide actual power system testing of the controls approach. Using mathematical software tools and the DECC Lab environment, we are developing and testing local, autonomous and adaptive controls for local voltage control and P & Q control for inverter-based DE. We successfully tested our active and non-active power (P,Q) controls at the DECC laboratory along with voltage regulation controls. The new PQ control along with current limiter controls has been tested on our existing inverter test system. We have tested both non-adaptive and adaptive control modes for the PQ control. We have completed several technical papers on the approaches and results. Electric power distribution systems are experiencing outages due to a phenomenon known as fault induced delayed voltage recovery (FIDVR) due to air conditioning (A/C) compressor motor stall. Local voltage collapse from FIDVR is

  14. Communications and control for electric power systems

    NASA Technical Reports Server (NTRS)

    Kirkham, H.

    1992-01-01

    A long-term strategy for the integration of new control technologies for power generation and delivery is proposed: the industry would benefit from an evolutionary approach that would adapt to its needs future technologies as well as those that it has so far not heeded. The integrated operation of the entire system, including the distribution system, was proposed as a future goal. The AbNET communication protocols are reviewed, and additions that were made in 1991 are described. In the original network, traffic was controlled by polling at the master station, located at the substation, and routed by a flooding algorithm. In a revised version, the polling and flooding are modified. The question of interfacing low-energy measurement transducers or instrument transformers is considered. There is presently little or no agreement on what the output of optical current transducers (CT's) should be. Appendices deal with the calibration of current transducers; with Delta modulation, a simple means of serially encoding the output of an OCT; and with noise shaping, a method of digital signal processing that trades off the number of bits in a digital sample for a higher number of samples.

  15. Method and apparatus for communicating computer data from one point to another over a communications medium

    DOEpatents

    Arneson, Michael R.; Bowman, Terrance L.; Cornett, Frank N.; DeRyckere, John F.; Hillert, Brian T.; Jenkins, Philip N.; Ma, Nan; Placek, Joseph M.; Ruesch, Rodney; Thorson, Gregory M.

    2007-07-24

    The present invention is directed toward a communications channel comprising a link level protocol, a driver, a receiver, and a canceller/equalizer. The link level protocol provides logic for DC-free signal encoding and recovery as well as supporting many features including CRC error detection and message resend to accommodate infrequent bit errors across the medium. The canceller/equalizer provides equalization for destabilized data signals and also provides simultaneous bi-directional data transfer. The receiver provides bit deskewing by removing synchronization error, or skewing, between data signals. The driver provides impedance controlling by monitoring the characteristics of the communications medium, like voltage or temperature, and providing a matching output impedance in the signal driver so that fewer distortions occur while the data travels across the communications medium.

  16. Performance Evaluation of Communication Software Systems for Distributed Computing

    NASA Technical Reports Server (NTRS)

    Fatoohi, Rod

    1996-01-01

    In recent years there has been an increasing interest in object-oriented distributed computing since it is better quipped to deal with complex systems while providing extensibility, maintainability, and reusability. At the same time, several new high-speed network technologies have emerged for local and wide area networks. However, the performance of networking software is not improving as fast as the networking hardware and the workstation microprocessors. This paper gives an overview and evaluates the performance of the Common Object Request Broker Architecture (CORBA) standard in a distributed computing environment at NASA Ames Research Center. The environment consists of two testbeds of SGI workstations connected by four networks: Ethernet, FDDI, HiPPI, and ATM. The performance results for three communication software systems are presented, analyzed and compared. These systems are: BSD socket programming interface, IONA's Orbix, an implementation of the CORBA specification, and the PVM message passing library. The results show that high-level communication interfaces, such as CORBA and PVM, can achieve reasonable performance under certain conditions.

  17. 77 FR 61032 - Proposal Review Panel for Computing Communication Foundations; Notice of Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-05

    ... Proposal Review Panel for Computing Communication Foundations; Notice of Meeting In accordance with the... the following meeting: Name: Site Visit, Proposal Panel Review for Expeditions in Computing Program..., ``Collaborative ] Research: Underdesigned and Opportunistic Computing Machines'', and to provide advise...

  18. Connections that Count: Brain-Computer Interface Enables the Profoundly Paralyzed to Communicate

    MedlinePlus

    ... Home Current Issue Past Issues Connections that Count: Brain-Computer Interface Enables the Profoundly Paralyzed to Communicate ... of this page please turn Javascript on. A brain-computer interface (BCI) system This brain-computer interface ( ...

  19. Connections that Count: Brain-Computer Interface Enables the Profoundly Paralyzed to Communicate

    MedlinePlus

    ... Current Issue Past Issues Connections that Count: Brain-Computer Interface Enables the Profoundly Paralyzed to Communicate Past ... this page please turn Javascript on. A brain-computer interface (BCI) system This brain-computer interface (BCI) ...

  20. Computers Control the Instruments of Science.

    ERIC Educational Resources Information Center

    House, James E.

    1982-01-01

    Discusses the role and use of microcomputers in scientific research, from monitoring instruments to controlling experimental processes. Included are descriptions of a computer-controlled protein sequencer and gene synthesizer, and microcomputer uses in medicine, physiology, biochemistry, and geology. (JN)

  1. Specification and implementation of an integrated packet communication facility for an array computer

    SciTech Connect

    Rathi, B.D.; Deshpande, S.; Sejnowski, M.; Walker, D.; Jenevein, R.; Lipovski, G.J.; Browne, J.C.

    1983-01-01

    Four distinct packet communication requirements for network architectured computer systems are: system control, dataflow data type movement, SIMD, data realignment and movement of high volume data between MIMD configurations when memory sharing is unavailable or too costly. This paper defines and describes a packet switching mechanism which meets each of these requirements. Mechanisms are also defined and described for breaking and restoring SIMD execution structures which are required to complete the implementation of packet switching for SIMD execution. The mechanisms were defined and are described in the context of the Texas reconfigurable array computer (TRAC), but should be in large measure adaptable to other network architectured systems. 8 references.

  2. A History of Computer Numerical Control.

    ERIC Educational Resources Information Center

    Haggen, Gilbert L.

    Computer numerical control (CNC) has evolved from the first significant counting method--the abacus. Babbage had perhaps the greatest impact on the development of modern day computers with his analytical engine. Hollerith's functioning machine with punched cards was used in tabulating the 1890 U.S. Census. In order for computers to become a…

  3. Interactive Monitoring of Computer-Based Group Communication. Paper P-71.

    ERIC Educational Resources Information Center

    Spangler, Kathleen; And Others

    The interactive monitoring of group communication through computers is a procedure analogous to biofeedback, and small group communication computer programs have been developed with monitoring software that has been used to evaluate the impact of the medium on group communication. There is presently no technical reason that such information could…

  4. Communication.

    ERIC Educational Resources Information Center

    Online-Offline, 1998

    1998-01-01

    This theme issue on communication includes annotated listings of Web sites, CD-ROM and computer software, videos, books, and professional resources that deal with various methods of communication. Sidebars discuss mythology, photojournalism, sharing ideas on the Web, and songs of protest. Suggestions for class activities are also included. (LRW)

  5. Gender and Computer-Mediated Communication: Group Processes in Problem Solving.

    ERIC Educational Resources Information Center

    Adrianson, L.

    2001-01-01

    Reports results from a study of university students in Sweden that investigated aspects of communicative processes using face-to-face and computer-mediated communication. Examined influences of gender on communication equality, social relations, and communicative processes and studied differences in self-awareness. Results showed few significant…

  6. Effects of Training on Computer-Mediated Communication in Single or Mixed Gender Small Task Groups.

    ERIC Educational Resources Information Center

    Savicki, Victor; Kelley, Merle; Ammon, Benjamin

    2002-01-01

    Investigates group gender composition and communication styles in small task groups involved in computer-mediated communication. Describes a study that tried to train small task groups in the use of one communication style and suggests further research in the area of communication training for online task groups. (Author/LRW)

  7. A Large Scale Computer Terminal Output Controller.

    ERIC Educational Resources Information Center

    Tucker, Paul Thomas

    This paper describes the design and implementation of a large scale computer terminal output controller which supervises the transfer of information from a Control Data 6400 Computer to a PLATO IV data network. It discusses the cost considerations leading to the selection of educational television channels rather than telephone lines for…

  8. Arranging computer architectures to create higher-performance controllers

    NASA Technical Reports Server (NTRS)

    Jacklin, Stephen A.

    1988-01-01

    Techniques for integrating microprocessors, array processors, and other intelligent devices in control systems are reviewed, with an emphasis on the (re)arrangement of components to form distributed or parallel processing systems. Consideration is given to the selection of the host microprocessor, increasing the power and/or memory capacity of the host, multitasking software for the host, array processors to reduce computation time, the allocation of real-time and non-real-time events to different computer subsystems, intelligent devices to share the computational burden for real-time events, and intelligent interfaces to increase communication speeds. The case of a helicopter vibration-suppression and stabilization controller is analyzed as an example, and significant improvements in computation and throughput rates are demonstrated.

  9. Computer control for remote wind turbine operation

    SciTech Connect

    Manwell, J.F.; Rogers, A.L.; Abdulwahid, U.; Driscoll, J.

    1997-12-31

    Light weight wind turbines located in harsh, remote sites require particularly capable controllers. Based on extensive operation of the original ESI-807 moved to such a location, a much more sophisticated controller than the original one has been developed. This paper describes the design, development and testing of that new controller. The complete control and monitoring system consists of sensor and control inputs, the control computer, control outputs, and additional equipment. The control code was written in Microsoft Visual Basic on a PC type computer. The control code monitors potential faults and allows the turbine to operate in one of eight states: off, start, run, freewheel, low wind shut down, normal wind shutdown, emergency shutdown, and blade parking. The controller also incorporates two {open_quotes}virtual wind turbines,{close_quotes} including a dynamic model of the machine, for code testing. The controller can handle numerous situations for which the original controller was unequipped.

  10. Computer-Based Exploratory Learning Systems for Communication-Handicapped Children.

    ERIC Educational Resources Information Center

    Geoffrion, Leo D.; Goldenberg, E. Paul

    1981-01-01

    A rationale for exploratory learning via computers is presented, emphasizing the need for modeling normal communication development in children with communication handicaps, including deafness, cerebral palsy, and autism. (Author/CL)

  11. Advanced information processing system: Inter-computer communication services

    NASA Technical Reports Server (NTRS)

    Burkhardt, Laura; Masotto, Tom; Sims, J. Terry; Whittredge, Roy; Alger, Linda S.

    1991-01-01

    The purpose is to document the functional requirements and detailed specifications for the Inter-Computer Communications Services (ICCS) of the Advanced Information Processing System (AIPS). An introductory section is provided to outline the overall architecture and functional requirements of the AIPS and to present an overview of the ICCS. An overview of the AIPS architecture as well as a brief description of the AIPS software is given. The guarantees of the ICCS are provided, and the ICCS is described as a seven-layered International Standards Organization (ISO) Model. The ICCS functional requirements, functional design, and detailed specifications as well as each layer of the ICCS are also described. A summary of results and suggestions for future work are presented.

  12. Meta-Analysis and Computer-Mediated Communication.

    PubMed

    Taylor, Alan M

    2016-04-01

    Because of the use of human participants and differing contextual variables, research in second language acquisition often produces conflicting results, leaving practitioners confused and unsure of the effectiveness of specific treatments. This article provides insight into a recent seminal meta-analysis on the effectiveness of computer-mediated communication, providing further statistical evidence of the importance of its results. The significance of the study is examined by looking at the p values included in the references, to demonstrate how results can easily be misconstrued by practitioners and researchers. Lin's conclusion regarding the research setting of the study reports is also evaluated. In doing so, other possible explanations of what may be influencing the results can be proposed. PMID:27154373

  13. [Forensic evidence-based medicine in computer communication networks].

    PubMed

    Qiu, Yun-Liang; Peng, Ming-Qi

    2013-12-01

    As an important component of judicial expertise, forensic science is broad and highly specialized. With development of network technology, increasement of information resources, and improvement of people's legal consciousness, forensic scientists encounter many new problems, and have been required to meet higher evidentiary standards in litigation. In view of this, evidence-based concept should be established in forensic medicine. We should find the most suitable method in forensic science field and other related area to solve specific problems in the evidence-based mode. Evidence-based practice can solve the problems in legal medical field, and it will play a great role in promoting the progress and development of forensic science. This article reviews the basic theory of evidence-based medicine and its effect, way, method, and evaluation in the forensic medicine in order to discuss the application value of forensic evidence-based medicine in computer communication networks. PMID:24665620

  14. Test experience on an ultrareliable computer communication network

    NASA Technical Reports Server (NTRS)

    Abbott, L. W.

    1984-01-01

    The dispersed sensor processing mesh (DSPM) is an experimental, ultrareliable, fault-tolerant computer communications network that exhibits an organic-like ability to regenerate itself after suffering damage. The regeneration is accomplished by two routines - grow and repair. This paper discusses the DSPM concept for achieving fault tolerance and provides a brief description of the mechanization of both the experiment and the six-node experimental network. The main topic of this paper is the system performance of the growth algorithm contained in the grow routine. The characteristics imbued to DSPM by the growth algorithm are also discussed. Data from an experimental DSPM network and software simulation of larger DSPM-type networks are used to examine the inherent limitation on growth time by the growth algorithm and the relationship of growth time to network size and topology.

  15. Test experience on an ultrareliable computer communication network

    NASA Technical Reports Server (NTRS)

    Abbott, L. W.

    1984-01-01

    The dispersed sensor processing mesh (DSPM) is an experimental, ultra-reliable, fault-tolerant computer communications network that exhibits an organic-like ability to regenerate itself after suffering damage. The regeneration is accomplished by two routines - grow and repair. This paper discusses the DSPM concept for achieving fault tolerance and provides a brief description of the mechanization of both the experiment and the six-node experimental network. The main topic of this paper is the system performance of the growth algorithm contained in the grow routine. The characteristics imbued to DSPM by the growth algorithm are also discussed. Data from an experimental DSPM network and software simulation of larger DSPM-type networks are used to examine the inherent limitation on growth time by the growth algorithm and the relationship of growth time to network size and topology.

  16. Topological computation based on direct magnetic logic communication

    PubMed Central

    Zhang, Shilei; Baker, Alexander A.; Komineas, Stavros; Hesjedal, Thorsten

    2015-01-01

    Non-uniform magnetic domains with non-trivial topology, such as vortices and skyrmions, are proposed as superior state variables for nonvolatile information storage. So far, the possibility of logic operations using topological objects has not been considered. Here, we demonstrate numerically that the topology of the system plays a significant role for its dynamics, using the example of vortex-antivortex pairs in a planar ferromagnetic film. Utilising the dynamical properties and geometrical confinement, direct logic communication between the topological memory carriers is realised. This way, no additional magnetic-to-electrical conversion is required. More importantly, the information carriers can spontaneously travel up to ~300 nm, for which no spin-polarised current is required. The derived logic scheme enables topological spintronics, which can be integrated into large-scale memory and logic networks capable of complex computations. PMID:26508375

  17. Design and implementation of a medium speed communications interface and protocol for a low cost, refreshed display computer

    NASA Technical Reports Server (NTRS)

    Phyne, J. R.; Nelson, M. D.

    1975-01-01

    The design and implementation of hardware and software systems involved in using a 40,000 bit/second communication line as the connecting link between an IMLAC PDS 1-D display computer and a Univac 1108 computer system were described. The IMLAC consists of two independent processors sharing a common memory. The display processor generates the deflection and beam control currents as it interprets a program contained in the memory; the minicomputer has a general instruction set and is responsible for starting and stopping the display processor and for communicating with the outside world through the keyboard, teletype, light pen, and communication line. The processing time associated with each data byte was minimized by designing the input and output processes as finite state machines which automatically sequence from each state to the next. Several tests of the communication link and the IMLAC software were made using a special low capacity computer grade cable between the IMLAC and the Univac.

  18. Steht der Computer im Widerspruch zu Kommunikation und Teamarbeit (Does the Computer Stand in Contradiction to Communication in Teamwork)?

    ERIC Educational Resources Information Center

    Stanglova, Marta

    The use of computers in the foreign language classroom in the Czech Republic is viewed with suspicion. Many teachers assert that computers prevent engagement in communication and teamwork, and that a computer could never replace a good teacher. This paper argues that from within a cognitive framework of language acquisition computers do indeed…

  19. Note: Computer controlled rotation mount for large diameter optics

    NASA Astrophysics Data System (ADS)

    Rakonjac, Ana; Roberts, Kris O.; Deb, Amita B.; Kjærgaard, Niels

    2013-02-01

    We describe the construction of a motorized optical rotation mount with a 40 mm clear aperture. The device is used to remotely control the power of large diameter laser beams for a magneto-optical trap. A piezo-electric ultrasonic motor on a printed circuit board provides rotation with a precision better than 0.03° and allows for a very compact design. The rotation unit is controlled from a computer via serial communication, making integration into most software control platforms straightforward.

  20. Status Report on UH/ALOHA Participation in the ATS-1 Computer Communications Experiment.

    ERIC Educational Resources Information Center

    Wax, David W.

    Current developments in an experiment on Computer Communications via the ATS-1 geosynchronous satellite are described. Initiated by the Spacecraft Data Systems Branch of the Ames Research Center, NASA, this experiment is designed to demonstrate the feasibility of utilizing satellite communication links to provide computer-computer and…

  1. Peplau in cyberspace: an analysis of Peplau's Interpersonal Relations Theory and computer-mediated communication.

    PubMed

    Hrabe, David P

    2005-05-01

    This paper explores the applicability of Peplau's Interpersonal Relations Theory to the context of computer-mediated communication. Although Peplau never intended her theory be applied to this mode of communication, research from the fields of communication and social psychology suggest that such application may be possible. After Peplau's theory is briefly summarized, research and theory dealing with computer-mediated communication are explored, and questions for future research endeavors are offered. PMID:16020056

  2. Fuzzy logic controller to improve powerline communication

    NASA Astrophysics Data System (ADS)

    Tirrito, Salvatore

    2015-12-01

    The Power Line Communications (PLC) technology allows the use of the power grid in order to ensure the exchange of data information among devices. This work proposes an approach, based on Fuzzy Logic, that dynamically manages the amplitude of the signal, with which each node transmits, by processing the master-slave link quality measured and the master-slave distance. The main objective of this is to reduce both the impact of communication interferences induced and power consumption.

  3. Materials science. Materials that couple sensing, actuation, computation, and communication.

    PubMed

    McEvoy, M A; Correll, N

    2015-03-20

    Tightly integrating sensing, actuation, and computation into composites could enable a new generation of truly smart material systems that can change their appearance and shape autonomously. Applications for such materials include airfoils that change their aerodynamic profile, vehicles with camouflage abilities, bridges that detect and repair damage, or robotic skins and prosthetics with a realistic sense of touch. Although integrating sensors and actuators into composites is becoming increasingly common, the opportunities afforded by embedded computation have only been marginally explored. Here, the key challenge is the gap between the continuous physics of materials and the discrete mathematics of computation. Bridging this gap requires a fundamental understanding of the constituents of such robotic materials and the distributed algorithms and controls that make these structures smart. PMID:25792332

  4. The Role of Social Presence in Learner-Centered Communicative Language Learning Using Synchronous Computer-Mediated Communication: Experimental Study

    ERIC Educational Resources Information Center

    Yamada, Masanori

    2009-01-01

    This study aimed to clarify the relationship between media, learners' perception of social presence, and output in communicative learning using synchronous computer-mediated communication (SCMC). In this study, we developed four types of SCMC: videoconferencing (image and voice), audioconferencing (voice but no image), text chat with image (image…

  5. Virtual microscopy: merging of computer mediated communication and intuitive interfacing

    NASA Astrophysics Data System (ADS)

    de Ridder, Huib; de Ridder-Sluiter, Johanna G.; Kluin, Philip M.; Christiaans, Henri H. C. M.

    2009-02-01

    Ubiquitous computing (or Ambient Intelligence) is an upcoming technology that is usually associated with futuristic smart environments in which information is available anytime anywhere and with which humans can interact in a natural, multimodal way. However spectacular the corresponding scenarios may be, it is equally challenging to consider how this technology may enhance existing situations. This is illustrated by a case study from the Dutch medical field: central quality reviewing for pathology in child oncology. The main goal of the review is to assess the quality of the diagnosis based on patient material. The sharing of knowledge in social face-to-face interaction during such meeting is an important advantage. At the same time there is the disadvantage that the experts from the seven Dutch academic medical centers have to travel to the review meeting and that the required logistics to collect and bring patient material and data to the meeting is cumbersome and time-consuming. This paper focuses on how this time-consuming, nonefficient way of reviewing can be replaced by a virtual collaboration system by merging technology supporting Computer Mediated Collaboration and intuitive interfacing. This requires insight in the preferred way of communication and collaboration as well as knowledge about preferred interaction style with a virtual shared workspace.

  6. Analysis of routine communication in the air traffic control system

    NASA Technical Reports Server (NTRS)

    Clark, Herbert H.; Morrow, Daniel; Rodvoid, Michelle

    1990-01-01

    The present project has three related goals. The first is to describe the organization of routine controller-pilot communication. This includes identifying the basic units of communication and how they are organized into discourse, how controllers and pilots use language to achieve their goals, and what topics they discuss. The second goal is to identify the type and frequency of problems that interrupt routine information transfer and prompt pilots and controllers to focus on the communication itself. The authors analyze the costs of these problems in terms of communication efficiency, and the techniques used to resolve these problems. Third, the authors hope to identify factors associated with communication problems, such as deviations from conventional air traffic control procedures.

  7. Computational Control Workstation: Users' perspectives

    NASA Technical Reports Server (NTRS)

    Roithmayr, Carlos M.; Straube, Timothy M.; Tave, Jeffrey S.

    1993-01-01

    A Workstation has been designed and constructed for rapidly simulating motions of rigid and elastic multibody systems. We examine the Workstation from the point of view of analysts who use the machine in an industrial setting. Two aspects of the device distinguish it from other simulation programs. First, one uses a series of windows and menus on a computer terminal, together with a keyboard and mouse, to provide a mathematical and geometrical description of the system under consideration. The second hallmark is a facility for animating simulation results. An assessment of the amount of effort required to numerically describe a system to the Workstation is made by comparing the process to that used with other multibody software. The apparatus for displaying results as a motion picture is critiqued as well. In an effort to establish confidence in the algorithms that derive, encode, and solve equations of motion, simulation results from the Workstation are compared to answers obtained with other multibody programs. Our study includes measurements of computational speed.

  8. Distributed communications and control network for robotic mining

    NASA Technical Reports Server (NTRS)

    Schiffbauer, William H.

    1989-01-01

    The application of robotics to coal mining machines is one approach pursued to increase productivity while providing enhanced safety for the coal miner. Toward that end, a network composed of microcontrollers, computers, expert systems, real time operating systems, and a variety of program languages are being integrated that will act as the backbone for intelligent machine operation. Actual mining machines, including a few customized ones, have been given telerobotic semiautonomous capabilities by applying the described network. Control devices, intelligent sensors and computers onboard these machines are showing promise of achieving improved mining productivity and safety benefits. Current research using these machines involves navigation, multiple machine interaction, machine diagnostics, mineral detection, and graphical machine representation. Guidance sensors and systems employed include: sonar, laser rangers, gyroscopes, magnetometers, clinometers, and accelerometers. Information on the network of hardware/software and its implementation on mining machines are presented. Anticipated coal production operations using the network are discussed. A parallelism is also drawn between the direction of present day underground coal mining research to how the lunar soil (regolith) may be mined. A conceptual lunar mining operation that employs a distributed communication and control network is detailed.

  9. Refurbishment program of HANARO control computer system

    SciTech Connect

    Kim, H. K.; Choe, Y. S.; Lee, M. W.; Doo, S. K.; Jung, H. S.

    2012-07-01

    HANARO, an open-tank-in-pool type research reactor with 30 MW thermal power, achieved its first criticality in 1995. The programmable controller system MLC (Multi Loop Controller) manufactured by MOORE has been used to control and regulate HANARO since 1995. We made a plan to replace the control computer because the system supplier no longer provided technical support and thus no spare parts were available. Aged and obsolete equipment and the shortage of spare parts supply could have caused great problems. The first consideration for a replacement of the control computer dates back to 2007. The supplier did not produce the components of MLC so that this system would no longer be guaranteed. We established the upgrade and refurbishment program in 2009 so as to keep HANARO up to date in terms of safety. We designed the new control computer system that would replace MLC. The new computer system is HCCS (HANARO Control Computer System). The refurbishing activity is in progress and will finish in 2013. The goal of the refurbishment program is a functional replacement of the reactor control system in consideration of suitable interfaces, compliance with no special outage for installation and commissioning, and no change of the well-proved operation philosophy. HCCS is a DCS (Discrete Control System) using PLC manufactured by RTP. To enhance the reliability, we adapt a triple processor system, double I/O system and hot swapping function. This paper describes the refurbishment program of the HANARO control system including the design requirements of HCCS. (authors)

  10. Parallel computations and control of adaptive structures

    NASA Technical Reports Server (NTRS)

    Park, K. C.; Alvin, Kenneth F.; Belvin, W. Keith; Chong, K. P. (Editor); Liu, S. C. (Editor); Li, J. C. (Editor)

    1991-01-01

    The equations of motion for structures with adaptive elements for vibration control are presented for parallel computations to be used as a software package for real-time control of flexible space structures. A brief introduction of the state-of-the-art parallel computational capability is also presented. Time marching strategies are developed for an effective use of massive parallel mapping, partitioning, and the necessary arithmetic operations. An example is offered for the simulation of control-structure interaction on a parallel computer and the impact of the approach presented for applications in other disciplines than aerospace industry is assessed.

  11. Locating hardware faults in a data communications network of a parallel computer

    DOEpatents

    Archer, Charles J.; Megerian, Mark G.; Ratterman, Joseph D.; Smith, Brian E.

    2010-01-12

    Hardware faults location in a data communications network of a parallel computer. Such a parallel computer includes a plurality of compute nodes and a data communications network that couples the compute nodes for data communications and organizes the compute node as a tree. Locating hardware faults includes identifying a next compute node as a parent node and a root of a parent test tree, identifying for each child compute node of the parent node a child test tree having the child compute node as root, running a same test suite on the parent test tree and each child test tree, and identifying the parent compute node as having a defective link connected from the parent compute node to a child compute node if the test suite fails on the parent test tree and succeeds on all the child test trees.

  12. Data communications in a parallel active messaging interface of a parallel computer

    DOEpatents

    Archer, Charles J; Blocksome, Michael A; Ratterman, Joseph D; Smith, Brian E

    2013-10-29

    Data communications in a parallel active messaging interface (`PAMI`) of a parallel computer, the parallel computer including a plurality of compute nodes that execute a parallel application, the PAMI composed of data communications endpoints, each endpoint including a specification of data communications parameters for a thread of execution on a compute node, including specifications of a client, a context, and a task, the compute nodes and the endpoints coupled for data communications through the PAMI and through data communications resources, including receiving in an origin endpoint of the PAMI a data communications instruction, the instruction characterized by an instruction type, the instruction specifying a transmission of transfer data from the origin endpoint to a target endpoint and transmitting, in accordance with the instruction type, the transfer data from the origin endpoint to the target endpoint.

  13. Computer controlled vent and pressurization system

    NASA Technical Reports Server (NTRS)

    Cieslewicz, E. J.

    1975-01-01

    The Centaur space launch vehicle airborne computer, which was primarily used to perform guidance, navigation, and sequencing tasks, was further used to monitor and control inflight pressurization and venting of the cryogenic propellant tanks. Computer software flexibility also provided a failure detection and correction capability necessary to adopt and operate redundant hardware techniques and enhance the overall vehicle reliability.

  14. Controlling Laboratory Processes From A Personal Computer

    NASA Technical Reports Server (NTRS)

    Will, H.; Mackin, M. A.

    1991-01-01

    Computer program provides natural-language process control from IBM PC or compatible computer. Sets up process-control system that either runs without operator or run by workers who have limited programming skills. Includes three smaller programs. Two of them, written in FORTRAN 77, record data and control research processes. Third program, written in Pascal, generates FORTRAN subroutines used by other two programs to identify user commands with device-driving routines written by user. Also includes set of input data allowing user to define user commands to be executed by computer. Requires personal computer operating under MS-DOS with suitable hardware interfaces to all controlled devices. Also requires FORTRAN 77 compiler and device drivers written by user.

  15. Effects of a computer-based intervention program on the communicative functions of children with autism.

    PubMed

    Hetzroni, Orit E; Tannous, Juman

    2004-04-01

    This study investigated the use of computer-based intervention for enhancing communication functions of children with autism. The software program was developed based on daily life activities in the areas of play, food, and hygiene. The following variables were investigated: delayed echolalia, immediate echolalia, irrelevant speech, relevant speech, and communicative initiations. Multiple-baseline design across settings was used to examine the effects of the exposure of five children with autism to activities in a structured and controlled simulated environment on the communication manifested in their natural environment. Results indicated that after exposure to the simulations, all children produced fewer sentences with delayed and irrelevant speech. Most of the children engaged in fewer sentences involving immediate echolalia and increased the number of communication intentions and the amount of relevant speech they produced. Results indicated that after practicing in a controlled and structured setting that provided the children with opportunities to interact in play, food, and hygiene activities, the children were able to transfer their knowledge to the natural classroom environment. Implications and future research directions are discussed. PMID:15162930

  16. Human/computer control of undersea teleoperators

    NASA Technical Reports Server (NTRS)

    Sheridan, T. B.; Verplank, W. L.; Brooks, T. L.

    1978-01-01

    The potential of supervisory controlled teleoperators for accomplishment of manipulation and sensory tasks in deep ocean environments is discussed. Teleoperators and supervisory control are defined, the current problems of human divers are reviewed, and some assertions are made about why supervisory control has potential use to replace and extend human diver capabilities. The relative roles of man and computer and the variables involved in man-computer interaction are next discussed. Finally, a detailed description of a supervisory controlled teleoperator system, SUPERMAN, is presented.

  17. Fault tolerant computer control for a Maglev transportation system

    NASA Technical Reports Server (NTRS)

    Lala, Jaynarayan H.; Nagle, Gail A.; Anagnostopoulos, George

    1994-01-01

    Magnetically levitated (Maglev) vehicles operating on dedicated guideways at speeds of 500 km/hr are an emerging transportation alternative to short-haul air and high-speed rail. They have the potential to offer a service significantly more dependable than air and with less operating cost than both air and high-speed rail. Maglev transportation derives these benefits by using magnetic forces to suspend a vehicle 8 to 200 mm above the guideway. Magnetic forces are also used for propulsion and guidance. The combination of high speed, short headways, stringent ride quality requirements, and a distributed offboard propulsion system necessitates high levels of automation for the Maglev control and operation. Very high levels of safety and availability will be required for the Maglev control system. This paper describes the mission scenario, functional requirements, and dependability and performance requirements of the Maglev command, control, and communications system. A distributed hierarchical architecture consisting of vehicle on-board computers, wayside zone computers, a central computer facility, and communication links between these entities was synthesized to meet the functional and dependability requirements on the maglev. Two variations of the basic architecture are described: the Smart Vehicle Architecture (SVA) and the Zone Control Architecture (ZCA). Preliminary dependability modeling results are also presented.

  18. Fault tolerant computer control for a Maglev transportation system

    NASA Astrophysics Data System (ADS)

    Lala, Jaynarayan H.; Nagle, Gail A.; Anagnostopoulos, George

    1994-05-01

    Magnetically levitated (Maglev) vehicles operating on dedicated guideways at speeds of 500 km/hr are an emerging transportation alternative to short-haul air and high-speed rail. They have the potential to offer a service significantly more dependable than air and with less operating cost than both air and high-speed rail. Maglev transportation derives these benefits by using magnetic forces to suspend a vehicle 8 to 200 mm above the guideway. Magnetic forces are also used for propulsion and guidance. The combination of high speed, short headways, stringent ride quality requirements, and a distributed offboard propulsion system necessitates high levels of automation for the Maglev control and operation. Very high levels of safety and availability will be required for the Maglev control system. This paper describes the mission scenario, functional requirements, and dependability and performance requirements of the Maglev command, control, and communications system. A distributed hierarchical architecture consisting of vehicle on-board computers, wayside zone computers, a central computer facility, and communication links between these entities was synthesized to meet the functional and dependability requirements on the maglev. Two variations of the basic architecture are described: the Smart Vehicle Architecture (SVA) and the Zone Control Architecture (ZCA). Preliminary dependability modeling results are also presented.

  19. Managing computer-controlled operations

    NASA Technical Reports Server (NTRS)

    Plowden, J. B.

    1985-01-01

    A detailed discussion of Launch Processing System Ground Software Production is presented to establish the interrelationships of firing room resource utilization, configuration control, system build operations, and Shuttle data bank management. The production of a test configuration identifier is traced from requirement generation to program development. The challenge of the operational era is to implement fully automated utilities to interface with a resident system build requirements document to eliminate all manual intervention in the system build operations. Automatic update/processing of Shuttle data tapes will enhance operations during multi-flow processing.

  20. 77 FR 60478 - Proposal Review Panel for Computing Communication Foundations; Notice of Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-03

    ... From the Federal Register Online via the Government Publishing Office NATIONAL SCIENCE FOUNDATION Proposal Review Panel for Computing Communication Foundations; Notice of Meeting In accordance with the... the following meeting: NAME: Site Visit, Proposal Panel Review for Expeditions in Computing...

  1. 77 FR 61032 - Proposal Review Panel for Computing Communication Foundations: Notice of Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-05

    ... From the Federal Register Online via the Government Publishing Office NATIONAL SCIENCE FOUNDATION Proposal Review Panel for Computing Communication Foundations: Notice of Meeting In accordance with the... the following meeting: Name: Site Visit, Proposal Panel Review for Expeditions in Computing...

  2. 46 CFR 169.826 - Steering, communications and control.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Steering, communications and control. 169.826 Section 169.826 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Operations Tests, Drills, and Inspections § 169.826 Steering, communications and...

  3. 46 CFR 169.826 - Steering, communications and control.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Steering, communications and control. 169.826 Section 169.826 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Operations Tests, Drills, and Inspections § 169.826 Steering, communications and...

  4. Improved computed torque control for industrial robots

    NASA Technical Reports Server (NTRS)

    Uebel, Mark; Minis, Ioannis; Cleary, Kevin

    1992-01-01

    The authors examine the computed torque control problem for a robot arm with flexible, geared, joint drive systems which are typical in many industrial robots. The standard computed torque algorithm is not directly applicable to this class of manipulators due to the dynamics introduced by the joint drive systems. The proposed approach overcomes this problem by combining a novel computed torque algorithm with simple torque controllers at each joint of the robot. The control scheme is applied to a seven degree-of-freedom industrial manipulator, and the system performance in standard tasks is evaluated using both dynamic simulation and actual experiments. The results show that the proposed controller leads to improved tracking performance over a conventional PD (proportional plus derivative) controller.

  5. Social Identification and Interpersonal Communication in Computer-Mediated Communication: What You Do versus Who You Are in Virtual Groups

    ERIC Educational Resources Information Center

    Wang, Zuoming; Walther, Joseph B.; Hancock, Jeffrey T.

    2009-01-01

    This study investigates the influence of interpersonal communication and intergroup identification on members' evaluations of computer-mediated groups. Participants (N= 256) in 64 four-person groups interacted through synchronous computer chat. Subgroup assignments to minimal groups instilled significantly greater in-group versus out-group…

  6. Computational study of anterior communicating artery hemodynamics before aneurysm formation

    NASA Astrophysics Data System (ADS)

    Castro, Marcelo A.; Putman, Christopher M.; Cebral, Juan R.

    2012-03-01

    It is widely accepted that complexity in the flow pattern at the anterior communicating artery (AComA) is associated with the high rate of aneurysm formation in that location observed in large studies. A previous computational hemodynamic study showed a possible association between high maximum intraaneurysmal wall shear stress (WSS) at the systolic peak with rupture in a cohort of AComA aneurysms. In another study it was observed a connection between location of aneurysm blebs and regions of high WSS in models where blebs were virtually removed. However, others reported associations between low WSS and either rupture or blister formation. The purpose of this work is to study associations between hemodynamic patterns and AComA aneurysm initiation by comparing hemodynamics in the aneurysm and the normal model where the aneurysm was computationally removed. Vascular models of both right and left circulation were independently reconstructed from three-dimensional rotational angiography images using deformable models, and fused using a surface merging algorithm. The geometric models were then used to generate high-quality volumetric finite element grids of tetrahedra with an advancing front technique. For each patient, the second anatomical model was created by digitally removing the aneurysm. It was iteratively achieved by applying a Laplacian smoothing filter and remeshing the surface. Finite element blood flow numerical simulations were performed. It was observed that aneurysms initiated in regions of high and moderate WSS in the counterpart normal models. Adjacent or close to those regions, low WSS portions of the arterial wall were not affected by the disease.

  7. An Investigation of the Relationships among Technology Experiences, Communication Apprehension, Writing Apprehension and Computer Anxiety.

    ERIC Educational Resources Information Center

    McDowell, Earl E.; Schuelke, L. David

    This study explored the relationships among communication technologies, communication apprehension, writing apprehension, and computer anxiety. Participants were 130 students from a variety of undergraduate oral communication classes in a large midwestern university who completed a modified form, 10 items, of McCroskey's Personal Report of…

  8. Effects of Gender on Computer-Mediated Communication: A Survey of University Faculty

    ERIC Educational Resources Information Center

    Valenziano, Laura

    2007-01-01

    The influence of gender on computer-mediated communication is a research area with tremendous growth. This study sought to determine what gender effects exist in email communication between professors and students. The study also explored the amount of lying and misinterpretation that occurs through online communication. The study results indicate…

  9. Deadlock-free asynchronous communication strategies for unstructured computations on iPSC/860

    SciTech Connect

    Venugopal, S.; Naik, V.K.

    1994-12-31

    In this paper, we describe efficient, scalable, and deadlock-free asynchronous communication strategies suitable for unstructured computations on iPSC/860. Using these deadlock-free strategies, which incur small overhead, we have optimized the communication in parallel sparse Cholesky factorization. We present experimental results to show that such optimizations can lead to more than 50% saving in communication costs.

  10. The future of voice-processing technology in the world of computers and communications.

    PubMed Central

    Kato, Y

    1995-01-01

    This talk, which was the keynote address of the NAS Colloquium on Human-Machine Communication by Voice, discusses the past, present, and future of human-machine communications, especially speech recognition and speech synthesis. Progress in these technologies is reviewed in the context of the general progress in computer and communications technologies. PMID:7479726