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Workshops on Object-Oriented Technology, ECOOP 1997

作者： Mens, Kim Lopes, Cristina Tekinerdogan, Bedir Kiczales, Gregor Department of Computer Science Programming Technology Lab Vrije Universiteit Brussel Pleinlaan 2 BrusselB-1050 Belgium Systems and Practices Laboratory Xerox PARC 3333 Coyote Hill Rd Palo AltoCA94304 United States Department of Computer Science Software Engineering University of Twente P.O. Box 217 Enschede7500 AE Netherlands

ISBN: (纸本)3540640398

Whereas it is generally acknowledged that code tangling reduces the quality of software and that aspect-oriented programming (AOP) is a means of addressing this problem, there is — as yet — no clear definition or characterisation of AOP. Therefore, the main goal of the ECOOP’97 AOP workshop was to identify the "good questions" for exploring the idea of AOP. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Aspect oriented programming

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The prototype of continuous media file system, CrownFS

The prototype of continuous media file system, CrownFS

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International Conference on Information Networking

作者： Se-Jin Hwang Jin-Uok Kim Myong-Soon Park Oh-Young Kwon Tae-Geun Kim Computer Systems Laboratory Computer Science Department Korea University Seoul South Korea Distributed Computing Laboratory Network Computing Department Systems Engineering Research Institute Daejeon South Korea

ISBN: (纸本)0818672250

Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies.

关键词： Prototypes File systems Streaming media Network servers Personal communication networks Multimedia systems Workstations High-speed networks File servers Costs

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Applications & frameworks

Applications & frameworks

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Workshops on Object-Oriented Technology, ECOOP 1997

作者： Ahlander, Krister Ahtee, Tero Holst, Wade Hung, Kitty Karadurak, Selma Kehr, Roger Nowack, Palle Tai, Stefan Department of Scientific Computing Box 120 Uppsala Sweden Tampere University of Technology Software Systems Laboratory Finland Department of Computer Science University of Alberta Canada South Bank University United Kingdom London Guildhall University CISM Dept. 100 Minories Tower Hill London United Kingdom Department of Computer Science WG Distributed Systems Technical University of Darmstadt Germany Department of Computer Science Aalborg University Fredrik Bajers Vej 7E Aalborg Ø Denmark Technical University Berlin Sekr. E-N 7 Einsteinufer 17 Berlin Germany

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Tickertape: notification and communication in a single line

Tickertape: notification and communication in a single line

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Proceedings of the Asia Pacific computer Human Interaction

作者： S. Parsowith G. Fitzpatrick S. Kaplan B. Segall J. Boot CRC for Distributed Systems Technology DSTC Australia Department of Computer Science and Electrical Engineering University of Queensland Saint Lucia Australia

This paper outlines an awareness application called Ticketape. Tickertape is a tool that displays event notifications in the form of scrolling messages across a single-line window. The Tickertape message window provides an interface to a world of highly tailorable transient information. We provide an overview of Tickertape features and then discuss its specific use within a semi-commercial research organisation. We note that although Tickertape's evolution was incidental rather than purposeful, it is being extensively used within our organisation. Usage data and interviews suggest that there is a select core group of users who use Tickertape for both work and leisure. Other more casual users use the tool sporadically for leisure purposes only. We highlight our current goal which is to optimise Tickertape usage within the work environment. Our long-term vision involves the incorporation of Tickertape into Orbit-Gold, our collaborative working environment and to make the tool accessible to external organisations.

关键词： Collaborative work Cyclic redundancy check computer science Tail Speech processing Telephony Videoconference Displays Collaborative software Video sharing

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Manifolds: cellular component organizations

Manifolds: cellular component organizations

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Technology of Object-Oriented Languages and systems (TOOLS)

作者： C. Herring S. Kapian Department of Computer Science and Electrical Engineering CRC for Distributed Systems Technology University of Queensland Brisbane QLD Australia University of Queensland Brisbane QLD AU

The article reports on initial investigation into a software architecture for component systems. Described is a geometrically based, cellular framework for the organization of component computation and communication. These structures are called Cellular Component Manifolds. The starting point for this work is the observation that the concept of address space is a pervasive abstraction across all computing and communicating systems. Accordingly, a generalized model of an idealized address space is proposed. A particular geometry with a suitable algebraic structure is chosen to provide addressing within this model. This results in an n-dimensional, hierarchical, cellular aggregate address space that is also a vector space with "nice" properties. The address spare, when populated with suitable components, becomes a Cellular Component Manifold. A component system architecture is given. This software architecture consists of three major layers: component framework framework, component frameworks and components. In addition to providing a basis for component system organization, this structure natively supports a range of scientific and engineering applications. As an example, the architecture is applied to the problem of handoff management in wireless overlay networks.

关键词： computer architecture Manifolds Software architecture Pervasive computing Organizing computer networks Wireless networks Operating systems computer science Cyclic redundancy check

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An information model for nomadic environments

An information model for nomadic environments

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International Workshop on Database and Expert systems Applications

作者： A. Bond M. Gallagher J. Indulska CRC for Distributed Systems Technology University of Queensland Saint Lucia Australia Department of Computer Science and Electrical Engineering University of Queensland Saint Lucia Australia

We present a software architecture which facilitates nomadic computing in an open distributed computing environment. We introduce a model for the description of mobile objects (users, computers and application objects) and their types. The descriptions create an information base for protocols managing mobility of the mobile objects. We present an architecture of servers which extend a distributed computing environment to implement these mobility management protocols.

关键词： distributed computing Application software computer architecture Mobile computing Mobile communication Hardware computer networks Protocols Bonding computer applications

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Support for mobile computing in open distributed systems

Support for mobile computing in open distributed systems

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IEEE Region 10 International Conference TENCON

作者： J. Indulska A. Bond M. Gallagher Department of Computer Science and Electrical Engineering University of Queensland Saint Lucia QLD Australia CRC for Distributed Systems Technology University of Queensland Saint Lucia QLD Australia

The Reference Model for Open distributed Processing provides a framework for building distributed heterogeneous applications and creates a good basis for building mobile (ubiquitous) computing applications. We analyse the requirements imposed by mobile computing on distributed environments and characterise adaptability strategies which can be applied in nomadic environments to cope with the quality of service changes due to user, computer or application mobility. We then describe the design of an architecture which extends the ODP architecture to provide support for mobile computing. We characterise the functionality of the architecture, the RPC semantics used for communication in this architecture as well as a prototype built in a CORBA environment.

关键词： Mobile computing distributed computing Pervasive computing computer architecture Application software computer applications distributed processing Buildings Quality of service Mobile communication

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Engineering safe, real-time distributed control systems

Engineering safe, real-time distributed control systems

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EUROMICRO Conference

作者： P. Croll C. Rudram C. Chambers N. Uchihira Communications and Distributed Systems Research Group Department of Computer Science University of Sheffield UK Toshiba Corporation Japan Software Engineering laboratories Toshiba Corporation Kawasaki Tokyo Japan

Reactive computer control systems need to track the behaviour of their inherently parallel physical environment. Hence, most non-trivial industrial applications may depend on concurrent modelling techniques to handle system complexities including hard real-time constraints. Failure of such systems can lead to unacceptable consequences and can therefore be deemed as safety-related with respect to their application. Parallel and distributed systems can exhibit undesirable behaviours, e.g. deadlock, which could render a control system unsafe. The paper proposes that a set of undesirable parallel behaviours can be classified as unsafe for all applications and reviews a technique that can be employed to avoid or mitigate against them, The approach needed by software engineers of parallel and distributed systems to facilitate this and meet the minimal safety standards is also given.

关键词： Real time systems distributed control Control systems Application software Software safety Concurrent computing Physics computing Electrical equipment industry System recovery Software standards

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Evaluating the overheads of source-directed quality-of-service routing

Evaluating the overheads of source-directed quality-of-servi...

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International Conference on Network Protocols

作者： A. Shaikh J. Rexford K.G. Shin Networking and Distributed Systems Network Mathematics Research AT and T Research Laboratories Florham Park NJ USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

Quality-of-service (QoS) routing satisfies application performance requirements and optimizes network resource usage but effective path-selection schemes require the distribution of link-state information, which can impose a significant burden on the bandwidth and processing resources in the network. We investigate the fundamental trade-off between network overheads and the quality of routing decisions in the context of the source-directed link-state routing protocols proposed for future IP and ATM networks. Through extensive simulation experiments with several representative network topologies and traffic patterns, we uncover the effects of stale link-state information, random fluctuations in traffic load, and variations of the link-cost metric on the routing and signalling overheads. The paper concludes by summarizing our key results as a list of guidelines for designing efficient quality-of-service routing policies in large backbone networks.

关键词： Quality of service Communication system traffic control Switches Routing protocols Resource management Mathematics computer science Argon Topology Electrical capacitance tomography

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Design and Implementation of an SNMPv2 Management System for MS-DOS/Novell NetWare and Unix-TCP/IP

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International Journal of Network Management 1998年第3期7卷

作者： Ahmed Patel Stephen Morris Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

SNMPv2 management tools for networks based on Novell NetWare and TCP/IP facilitate management of individual network workstations which allows a very detailed description of the network operation to be constructed. Using this, management can then be achieved across both the full range of NetWare workstation software versions and Unix-TCP/IP nodes. © 1997 John Wiley & Sons, Ltd.

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