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IEEE Region 10 international conference TENCON

作者： Seung Ho Cho Seung Ryeol Choi Department of Computer Engineering Kangnam University South Korea Department of Computer Engineering Air Force Academy South Korea

ISBN: (纸本)0780318625

the conventional load representation method expressing a load as queue length has a weakness in that it does not reflect execution characteristics of processes. To solve the inaccuracy of this conventional method of load representation, we propose the weighted load representation method which assigns graded weights to processes based on the execution characteristics of processes. the proposed method uses history information obtained during process scheduling. In order to derive the upper bound and the lower bound of the load in a node, the finite population queuing model is used. We devise heuristics for adaptive load sharing using the proposed representation method and derived upper and lower bounds. Simulation results show that GRRs of weight functions log i and i are improved 2.37-3.14 times compared with no load sharing and 14-24% as many as GRRs of the conventional load representation method.< >

关键词： distributed computing Upper bound History Delay Workstations Pressing Computational modeling throughput Load management Military computing

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Computerized procedure for short range planning of a designated distribution area

Computerized procedure for short range planning of a designa...

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IEEE Region 10 international conference TENCON

作者： Whei-Min Lin Ming-Tong Tsay Shi-Jaw Chen Department of Electrical Engineering National Sun Yat-Sen University Kaohsiung Taiwan Department of Electrical Engineering Kung Shan Institute of Technology and Commerce Tainan Taiwan

ISBN: (纸本)0780318625

Presents a computerized procedure for the assessment of distribution system planning. the proposed procedure was developed on a personal computer and is good for a designated area where multiple existing substations and multiple potential sites are considered. this procedure employs load flow analysis and considers the constraints of voltage drops and line flows. Various options are provided to satisfy the load. Losses and costs are evaluated for each case. An example is shown for a designated area and a target year, where the number of new feeders, transformers, substations and associated costs and losses were found for each option. the presented procedure could be deemed as a short-range planning method.< >

关键词： distributed computing Substations Load flow analysis Load flow Voltage Switches Costs Load modeling Business Sun

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Load balancing strategies for ray tracing on parallel processors

Load balancing strategies for ray tracing on parallel proces...

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IEEE Region 10 international conference TENCON

作者： Tong-Yee Lee C.S. Raghavendra J.B. Nicholas School of EE/CS Washington State University Pullman WA USA Pacific Northwest Laboratory Molecular Science Research Center Richland WA USA

Ray tracing is one of the computer graphics techniques used to render high quality images. Unfortunately, the ray tracing of complex scenes can require large amounts of CPU time, making the technique impractical for everyday use. Since the ray tracing calculations that determine the values of individual pixels are independent, this appears to be an easy problem to parallelize, and parallel algorithms have been proposed. However, pixel computation times can vary significantly, and naive attempts at parallelization give poor speedup due to the load imbalance between the processors. the key to achieving high parallel efficiency is to ensure that the computational load is evenly balanced. In this paper, we propose two new load balancing schemes and evaluate their performance for ray tracing on parallel processors. We term the new methods 'local distributed control' (LDC) and 'global distributed control' (GDC). Our new strategies are complementary: GDC performs forms well for high computational complexity images and LDC works well for low computational complexity images.< >

关键词： Load management Ray tracing Rendering (computer graphics) Layout Concurrent computing Discrete wavelet transforms Parallel processing Computer graphics Parallel algorithms Optical reflection

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Data fragmentation for parallel transitive closure strategies

Data fragmentation for parallel transitive closure strategie...

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1993 IEEE 9th international conference on Data Engineering

作者： Houtsma, Maurice A.W. Apers, Peter M.G. Schipper, Gideon L.V. Univ of Twente Enschede Netherlands

ISBN: (纸本)0818635703

A topic that is currently inspiring a lot of research is parallel (distributed) computation of transitive closure queries. In the disconnection set approach has been introduced as an effective strategy for such a computation. It involves reformulating a transitive closure query on a relation into a number of transitive closure queries on smaller fragments;these queries can then execute independently on the fragments, without need for communication and without computing the same tuples at more than one processor. Now that effective strategies as just mentioned have been developed, the next problem is that of developing adequate data fragmentation strategies for these approaches. this is a difficult problem, but of paramount importance to the success of these approaches. We discuss the issues that influence data fragmentation. We present a number of algorithms, each focusing on one of the important issues. We discuss the pros and cons of the algorithms, and we give some results of applying the algorithms to different types of graphs. this last aspect shows to what respect the algorithms indeed conform to the goals we set out.

关键词： distributed database systems

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Effects of multilevel security on real-time applications

Effects of multilevel security on real-time applications

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Annual Computer Security Applications conference

作者： R.K. Clark I.B. Greenberg P.K. Boucher T.F. Lunt P.G. Neumann D.M. Wells E.D. Jenson Concurrent Computer Corporation Westford MA USA Connection Technologies Harvard MA USA SRI International Inc. Menlo Park CA USA

this paper presents a brief overview of a notional airborne application scenario that requires both multilevel security and real-time processing. It was used to guide decisions related to formation of the security policy interpretation, the operating system interface, and the system services design for a multilevel secure real-time distributed operating system (MLS RT DOS) called Secure Alpha. We compare secure and nonsecure application designs for the scenario to assess the effects of MLS RT DOS security features on the structure of the application. the comparison reveals that the security features make real-time scheduling and the construction of robust applications more difficult for this scenario.< >

关键词： Multilevel systems Real time systems Operating systems Yarn Application software Military aircraft Concurrent computing Computer security Scheduling Robustness

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Tech writers: the next generation distributed systems and the changing roles of technical communicators 9

Tech writers: The next generation distributed systems and th...

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9th Annual international conference on Systems Documentation, SIGDOC 1991

作者： Galt, Phyllis S. Jones, Susan B. Information Systems Massachusetts Institute of Technology United States

In 1988, MIT9;s central computing organization, Information Systems, created a Network Services department. their mission was to enhance and maintain MITnet, the campuii network, and to develop and implement produc... 详细信息

ISBN: (纸本)089791452X

In 1988, MIT's central computing organization, Information Systems, created a Network Services department. their mission was to enhance and maintain MITnet, the campuii network, and to develop and implement products to be used in a distributed environment. this group, recently renamed distributed computing and Network Services (DCNS), incorporated some new approaches to software development and implementation at MIT. One important change was the inclusion of technical writers on the development teams. the authors, Phyllis Galt and Susan Jones, worked as technical writers on the first two development projects of Network Services. this paper will describe how the development learns for TechMail, a Macintosh TCP/IP-based electronic mail system, and TechInfo, a public information system, were able to integrate document development into the overall development process, as well as how the writers influenced the interface design. Susan and Phyllis are part of the Training and Publications Services (TPS) group in Information Systems. TPS provides support for departments within Information Systems, such as distributed computing and Network Services, as well as other departments at MIT. © 1991 ACM.

关键词： distributed computer systems

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OLH: An ort-line help facility for managing multiple document types in their native formats in a distributed environment 9

OLH: An ort-line help facility for managing multiple documen...

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9th Annual international conference on Systems Documentation, SIGDOC 1991

作者： Cunningham, Kevin M. Athena Documentation MIT Information Systems United States

ISBN: (纸本)089791452X

In trying to construct and maintain a useful and comprehensive on-line help system that organizes all the material available in a heterogenous distributed UNIX-based environment, our documentation group encountered three fundamental difficulties in dealing with existing online documents: • an incompatible variety of formats • no central location • political constraints Rather than spend our time converting and relocating perfectly good existing documents, we developed a menu-based help browser, OLH, that allows us to maintain the documents in their native formats and in their original locations in a way transparent to the user. the OLH system: • makes all our online documents accessible through a common interface • supports on-the-fly conversion of some document types to support users who can't view the documents in their native formats (e.g., over dialup) • allows us to maintain the hardcopy and on-line versions of many documents in single-source modules OLH is built on an operating-system-independent database, and currently has interfaces for devices supporting the X Windows System and plain-text terminals. © 1991 ACM.

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GEOMETRIC LEARNING ALGORIthMS

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PHYSICA D 1990年第1-3期42卷 307-321页

作者： OMOHUNDRO, SM International Computer Science Institute 1947 Center Street Suite 600 Berkeley CA 94704 USA

Emergent computation in the form of geometric learning is central to the development of motor and perceptual systems in biological organisms and promises to have a similar impact on emerging technologies including robotics, vision, speech, and graphics. this paper examines some of the trade-offs involved in different implementation strategies, focusing on the tasks of learning discrete classifications and smooth nonlinear mappings. the trade-offs between local and global representations are discussed, a spectrum of distributed network implementations are examined, and an important source of computational inefficiency is identified. Efficient algorithms based on k -d trees and the Delaunay triangulation are presented and the relevance to biological networks is discussed. Finally, extensions of both the tasks and the implementations are given.

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SOFTWARE ENGINEERING IN distributed SYSTEMS - APPROACHES AND ISSUES

SOFTWARE ENGINEERING IN DISTRIBUTED SYSTEMS - APPROACHES AND...

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9th ANNUAL international PHOENIX CONF ON COMPUTERS AND COMMUNICATIONS

作者： MUHLHAUSER, M Telematics Group University of Kaiserslautern Kaiserslautern Germany

ISBN: (纸本)0818620307

the author reports on issues of development support for distributed applications, that is applications intended to run cooperatively on a distributed system. Emphasis is put on the issues arising from the distributed nature of such software and on the use of object-oriented techniques. the author bases his discussion on the experiences gained with the development of two experimental software engineering environments (each including a dedicated distributed programming language). the first software engineering environment, called DESIGN, includes a distributed extension to C, called DC. DESIGN is operational and is currently used to develop sample distributed applications. A second project, DOCASE, introduces the object-oriented paradigm into the approaches discussed. DOCASE is based on a design-oriented language called DODL and is still under construction.< >

关键词： Software engineering Application software Telematics Object oriented programming distributed computing Operating systems distributed databases Object oriented databases Computer science Computer languages

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computing PARTICULAR SNAPSHOTS IN distributed SYSTEMS

COMPUTING PARTICULAR SNAPSHOTS IN DISTRIBUTED SYSTEMS

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9th ANNUAL international PHOENIX CONF ON COMPUTERS AND COMMUNICATIONS

作者： HELARY, JM PLOUZEAU, N RAYNAL, M IRISA Rennes France

ISBN: (纸本)0818620307

the focus of this work is on a particular class of unstable global states: the states with no in-transit message. A characterization of these states and their interest are given, along with the principles of their detection. As detecting these states requires a network traversal, choosing a particular implementation of this traversal gives one instance from a family of algorithms. the algorithm based on a virtual Hamiltonian cycle (a ring traversal) is presented and proved to be correct. the exposition of the principles and of the ring algorithm is done in an analytic way: algorithmic techniques are given separately (markers, message counting, network traversal) to lay down the snapshot definition properties.

关键词： Computer systems, Digital

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