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Proceedings of the 1996 ACM/IEEE conference on Supercomputing

作者： Yoonho Park Ridgway Scott Stuart Sechrest High Performance Computing Center University of Houston Houston TX Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI

ISBN: (纸本)9780897918541

Scientific applications often require some strategy for temporary data storage to do the largest possible simulations. The use of virtual memory for temporary data storage has received criticism because of performance problems. However, modern virtual memory found in recent operating systems such as Cenju-3/DE give application writers control over virtual memory policies. We demonstrate that custom virtual memory policies can dramatically reduce virtual memory overhead and allow applications to run out-of-core efficiently. We also demonstrate that the main advantage of virtual memory, namely programming simplicity, is not lost.

关键词： custom policies

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Fast simulation of tandem networks using importance sampling and stochastic gradient techniques

Fast simulation of tandem networks using importance sampling...

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IEEE International Conference on Communications (ICC)

作者： J.A. Freebersyser M. Devetsikiotis W.A. Al-Qaq J.K. Townsend U. S Army Research Ofice NC USA Department of Systems & Computer Engineering Carleton University Ottawa ONT Canada Compact Software Inc. Paterson NJ USA Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

To obtain large speed-up factors in Monte Carlo simulation using importance sampling (IS), the modification, or bias of the underlying probability measures must be carefully chosen. In this paper, we utilize the stochastic gradient descent (SGD) algorithm, which uses stochastic gradient optimization techniques, to arrive at favorable IS bias parameter settings for the simulation of tandem queues with bursty traffic, geometric service times and a finite buffer. We describe in detail the experimental method associated with applying the SGD algorithm. Speed-up factors of 1 to 8 orders of magnitude over conventional Monte Carlo estimation of the cell loss probability are achieved for the examples presented.

关键词： Monte Carlo methods Stochastic processes Stochastic systems

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Incorporation of relational modeling method into object-oriented analysis

Incorporation of relational modeling method into object-orie...

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IEEE International Conference on Communications (ICC)

作者： Chung-Horng Lung J.E. Urban G.T. Mackulak Software Engineering Analysis Laboratory Nortel Technologies Inc. Ottawa ONT Canada Department of Computer Science Arizona State University Tempe AZ USA Systems Simulation Laboratory Industrial & Management Systems Engineering Arizona State University Tempe AZ USA

It is a generally accepted concept that multiple views are needed in object-oriented analysis or domain analysis techniques. Three commonly adopted models for requirements analysis include object model, functional model and dynamic model. This paper introduces and incorporates the concept of relational modeling into the analysis techniques. Relational modeling mainly deals with two tasks: classification of semantic relations and identification of higher-order system causal relations. Classification of semantic relations supports comparison and evaluation of various relations, which in turn can be used to select suitable methods to process the relations. A higher-order relation depicts the relations between different relations as opposed to the relations between objects often discussed in object modeling. A network of higher-order relations reveals the cause-effect dependency relationships and can facilitate understanding and reasoning of application systems. Furthermore, incorporation of relational modeling techniques can support software reuse in an application domain or across domains.

关键词： Object oriented modeling Application software Lungs computer science Computational modeling Analytical models computer simulation Laboratories Seals software engineering

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Virtual Memory versus File Interface for Large, Memory-Intensive Scientific Applications

Virtual Memory versus File Interface for Large, Memory-Inten...

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Supercomputing Conference

作者： Yoonho Park R. Scott S. Sechrest High performance computing center University of Houston Houston TX USA Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

关键词： Memory Operating systems Control systems

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Data and information architectures for large-scale distributed data intensive information systems

Data and information architectures for large-scale distribut...

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International Working Conference on Scientific and Statistical Database Management

作者： L. Kerschberg H. Gomaa D. Menasce Jong Pil Yoon Center for Information Systems Integration and Evolution George Mason University Fairfax VA USA Department of Information and Software Systems Engineering George Mason University Fairfax VA USA Department of Computer Science George Mason University Fairfax VA USA Sookmyung Woman's University South Korea

The Earth Observing System (EOS) Data and Information System (EOSDIS) is perhaps one of the most important examples of large-scale, geographically distributed, and data intensive systems. The paper presents various facets of a data and information architecture for EOSDIS. EOS data is organized by means of an object-oriented schema, while EOS knowledge is organized through multiple domain-specific thesauri, complemented by domain knowledge and rules. The information holdings are organized into the source data archives, a data warehouse which provides an integrated view of the information holdings, and information marts which generate value-added information products for specialized user communities. Finally a federated client-server architecture is proposed to allow non-EOSDIS systems to become members of the EOSDIS community, allowing them to access EOSDIS holdings, and sharing their own data with EOSDIS.

关键词： Large-scale systems Information systems Earth Observing System Satellites computer architecture NASA Large scale integration Planets Instruments Atmosphere

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LAN fault management ensemble

LAN fault management ensemble

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IEEE Symposium on Network Operations and Management

作者： Y. Teshigawara N. Yoshie A. Komatsu T. Nakakawaji Department of Information Systems Science Engineering Soka University Tokyo Japan Information & Electronics Laboratories Sumitomo Electric Industries Limited Osaka Japan Computer Software Operation Unit Third Computer Software Division NEC Corporation Limited Tokyo Japan Information Technology Research and Development Center Mitsubishi Electric Corporation Limited Kamakura Kanagawa Japan

LAN systems are widely used in distributed environment and it becomes more indispensable to manage distributed LAN systems in an integrated manner as enterprise-level networks. This paper describes the LAN fault management ensemble which has been developed by the Ensemble Team of INTAP NM (Network Management) Technical Committee. Ensembles represent specific solutions to particular problems of the networks as a collection of managed resources, functions and scenarios. This ensemble provides a method of managing an enterprise-level private network in particular fault management areas. OSI management is adopted as a platform to manage LANs which are assumed to be managed by SNMP or OSI layer management protocols. This ensemble takes a state-oriented approach which is better suited, and provides more efficient integrated network management for large-scale enterprise networks containing many resources to be managed, because SNMP management is performed by polling based on the stateless approach. In addition, this ensemble adopts international standards or publicly available specifications regarding the necessary management information. Integrated management is executed by the OSI manager and proxy agents. Proxy agents act as OSI agents and convert information gathered by SNMP manager/agents or OSI layer management entities to OSI. Various network resources such as FDDI, Ethernet and MIB-II are defined on the basis of definition of the ISO/IEC, IEEE and NM Forum standards and additional necessary resources are uniquely defined for this ensemble requirements.

关键词： Local area networks Open systems Resource management Information management ISO standards IEC standards Environmental management Protocols Large scale integration FDDI

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A software architectural design method for large-scale distributed information systems

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Distributed systems engineering 1996年第3期3.0卷 162-172页

作者： Gomaa, Hassan Menascé, Daniel Kerschberg, Larry Department of Information and Software Systems Engineering George Mason University Fairfax VA 22030-4444 United States Department of Computer Science George Mason University Fairfax VA 22030-4444 United States

This paper describes a software architectural design method for large-scale distributed information systems. The method, which is part of an integrated design and performance evaluation method, addresses the design of client/server software architectures, where the servers need to cooperate with each other to service client requests. The goal of this software architecture is to provide a concurrent message based design that is highly configurable. The method is illustrated by applying it to the design of a complex software system, the Earth Observing System Data and Information System (EOSDIS) Core System.

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A method for understanding intentions of indirect speech acts in natural language interfaces

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systems AND computerS IN JAPAN 1996年第1期27卷 77-91页

作者： Mima, H Aoe, J Fuketa, M Hayashi, Y Member Faculty of Engineering The University of Tokushima Tokushima Japan 770 Jun-ichi Aoe received his B.E. and M.E. degrees in Electronic Engineering from the University of Tokushima Tokushima Japan in 1974 and 1976 respectively and his Ph.D. degree in Communication Engineering from the University of Osaka Japan in 1980. Since 1976 he has been with the University of Tokushima. He is currently a Professor in the Department of Information Science and Intelligent Systems at the University of Tokushima. He is the author of about 50 scientific papers. His research interests include computer algorithms in software engineering and natural language processing. Dr. Aoe is editing Computer Algorithms Series of the IEEE Computer Society Press and author of two books: Computer Algorithms-Key Search Strategies in 1991 and String Pattern Matching Strategies in 1994. He received a Best Author Award from the Information Processing Society of Japan in 1993. He is a member of the Association for Computing Machinery the American Association for Artificial Intelligence the Association for Computational Linguistics and the Information Processing Society of Japan the Society for Software Science and Technology the Japanese Society for Artificial Intelligence and the Association for Natural Language Processing of Japan. Nonmember

In an attempt to propose a robust method for understanding natural language (NL) interface commands, a scheme is proposed that infers intentions from an indirect speech-act that does not express users' real intentions explicitly. This method classifies the real intentions of the indirect speech-act into: 1) refusal;2) reversal;3) restriction;4) benefit;and 5) disability. Further, concepts are abstracted for operations, e.g., displaying, moving, and deleting information systems;and constructing the operation knowledge base. This knowledge based comprises operational concepts and the relationships between them. These relationships are assigned the foregoing classifications for intentions. In addition, we construct the knowledge base of objects for the target of operations, e.g., files, figures, strings. This knowledge base contains the relationships: a) antonym;b) exclusive;c) part-of, between the objects;and uses these relations to infer the transitions between the objects. An algorithm is the proposed to infer concepts for operations and concepts for target objects of operations that may represent the user's actual intentions. This proposal scheme was tested with requests on UNIX and a commercially available Japanese Word Processor. The system successfully inferred the intentions for approximately 80 percent of the user's indirect speech-act.

关键词： natural language interface indirect speech act inference of intention

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CRITICAL BANDWIDTH ALLOCATION FOR THE DELIVERY OF COMPRESSED VIDEO

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computer COMMUNICATIONS 1995年第10期18卷 709-717页

作者： FENG, WC SECHREST, S Software Systems Research Lab Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

The transportation of compressed video data without loss of picture quality requires the network to support large fluctuations in bandwidth requirements. These fluctuations can be smoothed, but straightforward approaches to smoothing can still suffer from excessive buffering requirements, poor buffer utilization and an excessive number of bandwidth changes. This paper introduces critical bandwidth allocation, which reduces the number of bandwidth changes to a very small number, and achieves the maximum effectiveness from client-side buffers. A comparison between critical bandwidth allocation algorithms and other smoothing algorithms is presented, the sensitivity of the algorithm to jitter is examined, and, implications for the design of network services are discussed.

关键词： VIDEO-ON-DEMAND BANDWIDTH ALLOCATION MPEG VIDEO COMPRESSION SMOOTHING

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PROGRAM VIEW GENERATION AND CHANGE ANALYSIS USING ATTRIBUTED DEPENDENCY GRAPHS

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JOURNAL OF software MAINTENANCE-RESEARCH AND PRACTICE 1995年第4期7卷 239-261页

作者： ALZOUBI, R PRAKASH, A Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122 U.S.A. He is currently an Assistant Professor at Yarmouk University Irbed H.K. of Jordan. Earlier he has worked for the Ford Motor Company in Dearborn Michigan. His research interests are in the area of software engineering. Since 1989 he has been with the Department of Electrical Engineering and Computer Science at the University of Michigan Ann Arbor where he is currently an Associate Professor. His research interests include software engineering and computer-supported cooperative work. He is a member of the ACM and the IEEE Computer Society.

software maintenance is usually the most expensive phase of the software life-cycle, Program understanding and impact-of-change analysis are two of the major activities during this phase, In this paper, we describe attributed program dependency graphs (APDGs), a model to store information derived from the program source code and ease construction of tools for software maintenance, We show how the model can be used for interactive view generation and doing two kinds of impact-of-change analysis-incremental and comparison-oriented. Incremental change analysis uses APDGs and a Rule Base to provide a way for the user to analysis the effect of proposed well-defined changes, Comparison-oriented change analysis allows a user to generate structural semantic differences between two versions of a subsystem after an arbitrary sequence of changes, We also introduce SCAN, a prototype collection of loosely integrated tools based on the APDG model and describe our experiences with the system.

关键词： PROGRAM REPRESENTATION DEPENDENCY GRAPHS PROGRAM UNDERSTANDING REVERSE-engineering REengineering IMPACT ANALYSIS CHANGE ANALYSIS

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