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IEEE Globecom Workshops

作者： M. Haahr R. Cunningham V. Cahill Distributed Systems Group Department of Computer Science University of Dublin-Trinity College Dublin Ireland

ISBN: (纸本)078037133X

Our previous work in mobility support for CORBA applications resulted in the design and implementation of the Architecture for Location-Independent CORBA Environments (ALICE). The first version of ALICE enabled CORBA objects running on mobile devices to interact transparently with objects hosted by off-the-shelf CORBA implementations without relying on a centralised location register to keep track of their whereabouts. This paper presents the second version of ALICE on which work is ongoing. The improved architecture retains the features of the original and adds support for disconnected operation in the form of caching of server functionality on the client side. Furthermore, the architecture is being generalised beyond CORBA in order to make it applicable to other distribution infrastructures, such as Java RMI and DCOM.

关键词： Protocols computer architecture Network servers Web server Application software Java Mobile communication computer science Educational institutions Middleware

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StreamJoin: a generic database approach to support the class of stream-oriented applications

StreamJoin: a generic database approach to support the class...

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International Symposium on Database Engineering and Applications (IDEAS)

作者： C. Nippl R. Rantzau B. Mitschang Department of Computer Science Technical University Munich Munich Germany Institute of Parallel and Distributed High Performance Systems University of Stuttgart Stuttgart Germany

Today many applications routinely generate large quantities of data. The data often takes the form of (time) series, or more generally streams, i.e. an ordered sequence of records. Analysis of this data requires stream processing techniques which differ in significant ways from what current database analysis and query techniques have been optimized for. In this paper we present a new operator, called StreamJoin, that can efficiently be used to solve stream-related problems of various applications, such as universal quantification, pattern recognition and data mining. Contrary to other approaches. StreamJoin processing provides rapid response times, a non-blocking execution as well as economical resource utilization. Adaptability to different application scenarios is realized by means of parameters. In addition, the StreamJoin operator can be efficiently embedded into the database engine, thus implicitly using the optimization and parallelization capabilities for the benefit of the application. The paper focuses on the applicability of StreamJoin to integrate application semantics into the DBMS.

关键词： Databases Data analysis Proteins Itemsets Application software Data mining Sequences Decision support systems computer science Pattern recognition

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Generic programming: International seminar on generic programming dagstuhl castle, Germany, April 27-May 1, 1998 selected papers

Generic programming: International seminar on generic progra...

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International Seminar on Generic Programming, 1998

作者： Jazayeri, Mehdi Loos, Rüdiger G. K. Musser, David R. Technical University of Vienna Information Systems Institute Distributed Systems Group Argentinierstr. 8/184-1 Vienna Austria Universität Tübingen Wilhelm-Schickard-Institut für Informatik Sand 13 Tübingen Germany Rensellaer Polytechnic Institute Computer Science Department TroyNY United States

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As strong as possible mobility

As strong as possible mobility

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International Conference on Software Engineering (ICSE)

作者： T. Walsh P. Nixon S. Dobson Dept. of Comput. Sci. Trinity Coll. Dublin Ireland Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

In Java there is no close coupling between a thread and the objects from which they were created. The use of a container abstraction allows us to group threads and their respective objects into a single structure. A container that holds threads whose variables are all housed within the container is a perfect candidate for strong migration. To achieve this we propose a combination of three techniques to allow the containers to migrate in a manner that approaches strong mobility yet does not resort to retaining bindings to resources across distant and unreliable networks.

关键词： Yarn Java Containers Permission Data structures computer science Educational institutions Internet Resource management Printers

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Workshop on software and performance [Guest Editors' Introduction]

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IEEE Transactions on Software Engineering 2000年第12期26卷 1121-1121页

作者： A.M.K. Cheng P. Clements M. Woodside Department of Computer Science University of Houston Houston TX USA Software Engineering Institute Carnegie Mellon University Pittsburgh PA USA Real-Time and Distributed Systems Group Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada

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Cost model and copyright management for 3D digital contents using multilevel complex objects

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systems and computers in Japan 2000年第12期31卷 73-82页

作者： Kidawara, Yutaka Sugiyama, Yuichi Tanaka, Katsumi Telecom. Adv. Organization of Japan Kobe 650-0046 Japan Div. of Media and Computer Sciences Grad. Sch. of Science and Technology Kobe University Kobe 657-0013 Japan Dept. of Comp. and Syst. Engineering Grad. Sch. of Science and Technology Kobe University Kobe 657-0013 Japan Instrumentation Department School of Engineering Kobe University Kobe Steel Ltd. Telecom. Adv. Organization of Japan Dept. of Comp. and Syst. Engineering Grad. Sch. of Sci. and Engineering Kobe University Information Processing Council Syst. Contr. and Info. Association Eng. and Information Department Kyoto University Education Department Kobe University Engineering School Engineering Department Div. of Media and Computer Sciences Grad. Sch. of Science and Technology Database Systems Research Group Information Processing Council Next Generation Digit. Image C. Res. Distributed Devmt.-type D. Min. of Educ.'s Focal Topic Research Kobe Multimedia Internet Cooperative Information Processing Council Artif. Intelligence Association IEEE Computer Society

The authors discuss multimedia data communications using the Internet from the standpoint of providing services, and propose a cost model based on multilevel complex objects for the purpose of responding to the various needs of users. The proposed cost model creates multiple levels of the service which provide each element of the complex object, and then introduces the concept of `service ranges' that can dynamically vary the service which can be received within the scope of the price paid. Conventional multimedia data can only provide one service. However, the authors' service can be selected dynamically from within a range based on the price paid by the user. In order to evaluate these methods, the authors created a framework which can be applied to 3DCG content using VRML by using Java and OODBMS. In addition, rights such as copyrights that are frequently a part of 3DCG content must be protected. The proposed multilevel complex object can confirm a user's rights by using a built-in user authentication function. Thus, copyright management features that provide services within a service range available to valid users and block out illegal users can be realized.

关键词： Multimedia systems

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Supporting CORBA Applications in a Mobile Environment 99

Supporting CORBA Applications in a Mobile Environment

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5th Annual ACM/IEEE International Conference on Mobile Computing and Networking, MobiCom 1999

作者： Haahr, Mads Cunningham, Raymond Cahill, Vinny Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

ISBN: (纸本)9781581131420

CORBA, the Common Object Request Broker Architecture, defines a framework for developing object-oriented distributed applications. Unfortunately, current implementations of CORBA have not been designed with support for mobile computers in mind. Using CORBA in a mobile environment raises a number of problems due to hardware mobility and the characteristics of wireless networks. This paper identifies and discusses these problems and presents the design and implementation of our Architecture for Location Independent CORBA Environments (ALICE). ALICE allows CORBA objects running on mobile devices to interact transparently with objects hosted by off-the-shelf CORBA implementations. Importantly, ALICE allows server as well as client objects to reside on mobile hosts without relying on a centralised location register to keep track of their whereabouts. © 1999 Association for Computing Machinery. All rights reserved.

关键词： Common object request broker architecture (CORBA)

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Delivering QoS in open distributed systems 7

Delivering QoS in open distributed systems

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7th IEEE Workshop on Future Trends of distributed Computing systems, FTDCS 1999

作者： Siqueira, Frank Cahill, Vinny Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

ISBN: (纸本)076950468X

This paper describes an architecture that provides support for quality of service (QoS) in open systems. The Quartz QoS architecture aims to avoid the dependency on specific platforms that limits the application of most existing QoS architectures in open, heterogeneous and distributed systems. Quartz adopts a flexible and extensible platform-independent design that allows its internal components to be rearranged dynamically, adapting the architecture to the surrounding environment in order to accommodate the differences among diverse computing platforms. Further significant problems found in other QoS architectures, such as the lack of transparency, flexibility and expressiveness in the specification of QoS requirements and limited support for resource adaptation, are also addressed by quartz. This paper compares Quartz to other QoS architectures found in the literature, presents a prototype implementation of Quartz, and shows how Quartz is integrated with CORBA to form a framework for control and transfer of streaming media. © 1999 IEEE.

关键词： Quality of service

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Optimal scheduling of iterative data-flow programs onto multiprocessors with non-negligible interprocessor communication 7th

Optimal scheduling of iterative data-flow programs onto mult...

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7th International Conference on High-Performance Computing and Networking, HPCN Europe 1999

作者： Antony Louis Piriyakumar, D. Levi, Paul Siva Ram Murthy, C. Institute of Parallel and Distributed High-Performance Systems University of Stuttgart Stuttgart70565 Germany Department of Computer Science and Engineering Indian Institute of Technology Chennai600 036 India

ISBN: (纸本)3540658211

The problem of optimal compile-time multiprocessor scheduling of iterative data-flow programs with feedback (delay elements) is addressed in this paper, unlike the earlier studies assumed the availability of a large number of processors and complete interconnection among them along with the interprocessor communication (IPC) to be non-negligible to be more realistic. We first explain the effects of including IPC in non-overlapped, overlapped, fully-static, and cyclo-static multiprocessor schedules with LMS filter as a realistic example. The effect of IPC in the rate-optimal schedules with the transformation techniques viz. unfolding and retiming in scheduling data-flow programs with optimal unfolding is discussed with an example. We then propose an algorithm, based on the well-known A* algorithm, for optimal scheduling of data-flow programs onto multiprocessors, which uses only minimum number of processors. To alleviate the impediments of large requirements of memory space and CPU time for the optimal scheduling algorithm, we present an effective technique, branch join path isomorphism (BJP) which relies on our previously defined processor isomorphism, task isomorphism, and node isomorphism apart from the lower bound theory and upper bound on the completion time. The schedules produced by our algorithm are superior to those obtained by the earlier algorithms despite considering IPC as non-negligible and also not completely connected multiprocessor systems. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Scheduling

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A dynamic negotiation framework for mobile agents 1

A dynamic negotiation framework for mobile agents

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1st International Symposium on Agent systems and Applications and 3rd International Symposium on Mobile Agents, ASA/MA 1999

作者： Tu, M.T. Seebode, C. Lamersdorf, W. Computer Science Department University of Hamburg Distributed Systems Group Vogt-Kölln-Str. 30 Hamburg22527 Germany

ISBN: (纸本)0769503403

In this paper, a framework to integrate negotiation capabilities - particularly components implementing a negotiation strategy - into mobile agents is introduced. The framework is based on a plug-in mechanism enabling a dynamic composition of negotiating agents out of pluggable modules. Strategy modules are further decomposed into parallel execution units based on the notion of an actor system.

关键词： Mobile agents

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