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Computer

Issue 9 • Date Sept. 1993

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Displaying Results 1 - 6 of 6
  • Internet resource discovery at the University of Colorado

    Page(s): 25 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1243 KB)  

    The author discusses aspects of Internet's resource discovery problem: how users specify searches, the difference between discovering classes of resources and locating appropriate instances, system-management problems that can be cast as global state discovery searches, issues involved with characterizing resources and with the efficient distribution of characterizing information, and social issues, especially privacy. Results of efforts to address these problems as part of the Networked Resource Discovery project at the University of Colorado are presented. These efforts use a variety of experimental approaches, including prototype systems, network measurement studies, and simulation studies.<> View full abstract»

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  • A systematic approach to designing distributed real-time systems

    Page(s): 68 - 78
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1252 KB)  

    The authors describe the use of generalized rate monotonic scheduling (GRMS) theory for the design and analysis of a distributed real-time system. This theory ensures that as long as the system utilization of all tasks lies below a certain bound, and appropriate scheduling algorithms are used, all tasks will meet their deadlines. This puts the development and maintenance of real-time systems on an analytic, engineering basis making, these systems easier to develop and maintain. The authors review the recent extensions of the theory to distributed systems scheduling and examine the architectural requirements for use of the theory. They provide an application example to demonstrate the benefits of this theory.<> View full abstract»

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  • Internet resource discovery services

    Page(s): 8 - 22
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    An overview of resource discovery services currently available on the Internet is presented. The authors concentrate on the following discovery tools: the Wide Area Information Servers (WAIS) project, Archie, Prospero, Gopher. The World-Wide Web (WWW), Netfind, the X.500 directory, Indie, the Knowbot Information Service (KIS), Alex, Semantic File Systems, and Nomenclator. The authors summarize the surveyed tools by presenting a taxonomy of their characteristics and design decisions. They also describe where to find and how to access several of the surveyed discovery services. They conclude with a discussion of future directions in the area of resource discovery and retrieval.<> View full abstract»

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  • Modeling and distributed simulation of a broadband-ISDN network

    Page(s): 37 - 51
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    A distributed approach to communication network simulation using a network of workstations configured as a loosely coupled parallel processor to model and simulate the broadband integrated services digital network (B-ISDN) is proposed. In a loosely coupled parallel processor system, a number of concurrently executable processors communicate asynchronously using explicit messages over high-speed links. Since this architecture is similar to that of B-ISDN networks, it constitutes a realistic testbed for their modeling and simulation. The authors describe an implementation of this approach on 50 Sun workstations at Brown University. Performance results, based on representative B-ISDN networks and realistic traffic models, indicate that the distributed approach is efficient and accurate.<> View full abstract»

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  • Computer networks in Estonia, Latvia, and Lithuania

    Page(s): 53 - 64
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    The authors focus on electronic networking in the Baltic republics in the aftermath of their newly regained independence. The authors present background on the existing technology and the problems the Baltics inherited from the erstwhile Soviet Union that have constrained network development. The problems have included limited technical capabilities of Soviet-manufactured computers and the expensive, yet ineffective, communication infrastructure in principal USSR regions. The Baltic republics' Fidonet connectivity, UUCP dial-up connections, and Internet country top-level domains are discussed. The electronic and computer industry and the communication infrastructure, which now form the backbone of Baltic computer-network development, are described.<> View full abstract»

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  • Mobile computing

    Page(s): 81 - 82
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    The problems, limitations, and potential advantages of mobile computing systems are discussed. It is suggested that the constraints violate many of the assumptions upon which today's distributed systems are based. A key requirement of mobile computing systems will be the ability to access critical data regardless of location, which implies interdependence between the elements of a mobile computing system. The Coda file system, which is an effort to provide transparency of environment to mobile computing systems, is reviewed.<> View full abstract»

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Computer, the flagship publication of the IEEE Computer Society, publishes highly acclaimed peer-reviewed articles written for and by professionals representing the full spectrum of computing technology from hardware to software and from current research to new applications.

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Editor-in-Chief
Ron Vetter
University of North Carolina
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