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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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ASPECT-an Architecture SPECification Technique a report on work in progress

ASPECT-an Architecture SPECification Technique a report on w...

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International Conference and Workshop on engineering of computer-Based systems

作者： V. Kirova W. Rossak Department of Computer and Information Science Department of Computer and Information Science New Jersey Institute of Technology Newark NJ USA Department of Computer and Information Science Department of Computer and Information Science Software and Systems Engineering Laboratory New Jersey Institute of Technology Newark NJ USA

We discuss ASPECT, a first step towards a generic specification technique for software architectures. We present and discuss an abstract grammar for ASPECT that lists and relates to each other all the architectural elements that form ASPECT's vocabulary. After elaborating on the characteristics of these architectural elements, we illustrate their application in a small example.

关键词： computer architecture software systems systems engineering and theory Laboratories software architecture Information science Open systems Costs Decision support systems Standardization

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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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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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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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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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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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Optimizing the NASA technical report server

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INTERNET RESEARCH-ELECTRONIC NETWORKING APPLICATIONS AND POLICY 1996年第1期6卷 64-&页

作者： Nelson, ML Maa, MH Michael L. Nelson is the “webmaster” for NASA Langley Research Center Computer Systems Branch Mail Stop 157A 15 Langley Boulevard Hampton VA 23681‐0001 USA. Tel: 804 8648511 Fax: 804 8648342 E‐mail: <m.l.nelson@larc.nasa.gov> . He has also worked with others to implement report servers software servers technology transfer databases and other World Wide Web services and is also the technical lead for NASA Langley Research Center’s workstation clustering activities. Ming‐Hokng Maa is a NASA Langley Research Center Cooperative Education Student e‐mail: <m.h.maa@larc.nasa.gov> pursuing his BS in computer engineering/computer science at the Massachusetts Institute of Technology. He has previously held research positions at nView Corp. and the Inter‐National Research Institute Inc Ming‐Hokng Maa is a NASA Langley Research Center Cooperative Education Student e‐mail: <m.h.maa@larc.nasa.gov> pursuing his BS in computer engineering/computer science at the Massachusetts Institute of Technology. He has previously held research positions at nView Corp. and the Inter‐National Research Institute Inc

Explains how the NASA Technical Report Server, a World Wide Web report distribution NASA technical publications service, has been modified for performance enhancement, greater protocol support and human interface optimization. Results include: parallel database queries, significantly decreasing user access times by an average factor of 2.3;access from clients behind firewalls and/or proxies which truncate excessively long Uniform Resource Locators;access to non-Wide Area Information Server (WAIS) databases and compatibility with the Z39-50.3 protocol;and a streamlined user interface.

关键词： distribution information retrieval information services Internet

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Coating mass control on No. 2 galvanizing line at LTV Steel's Indiana Harbor works

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Iron and Steel Engineer 1996年第1期73卷 22-22页

作者： Adams, J. Miles, L. Bohney Parker, D.J. Conway, G. Wallace, G. Computer Systems Technology Center Independence OH United States Indiana Harbor Works LTV Steel Co. Inc. East Chicago IN United States Software Engineering Special Projects Indust. Automat. Services Pty. Ltd. Toronto NSW Australia

A high-performance coating mass control system was designed using an analytical first principles model and advanced control methods. This computer control system was installed and successfully commissioned in March 1994 on the No. 2 continuous galvanizing line at LTV Steel's Indiana Harbor works. Commissioning was fast and smooth due to the use of a process simulator, task partitioning for parallel subsystem development, good project management methods and close cooperation of the three participating companies. Significant improvements were achieved for coating mass uniformity, reduced skew coating footage, reduced order change footage, reduced rejects for coating reasons and reduced zinc usage. This control system and the line upgrade projects that preceded it have made the No. 2 continuous galvanizing line a state of the art hot dip facility for producing the highest quality galvannealed and galvanized products that meet the needs of the most demanding customers and applications. Current work is focused on enhancing product performance, achieving additional zinc savings, and development of new products made possible by improved coating uniformity and tighter coating control. Additional projects in progress for this line include upgrading the air supply system, the knife positioning and measuring systems, and running trials for new products. Upgrading programs for LTV's other coating lines are following the example set by the No. 2 CGL.

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