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1st International Workshop on Services in distributed and Networked Environments, SDNE 1994

作者： Biggs, Christopher J. Brookes, Wayne Indulska, Jadwiga CRC for Distributed Systems Technology Department of Computer Science University of Queensland BrisbaneQLD4072 Australia

ISBN: (纸本)0818658355

The paper presents an enhancement to the OSF DCE platform for distributed computing that is designed to enhance interoperability of applications. Concepts from Open distributed Processing have been taken, extended and applied to DCE to improve the capacity for late binding, system evolution, resource discovery and software reusability. The paper analyzes approaches to application interoperability in a number of distributed computing platforms and based on the results, describes an enhancement for the DCE platform. The paperfocuses on one component of this enhancement: a type manager that will be able to canonically describe types of interacting objects and types of relationships between them. © 1994 IEEE.

关键词： Interoperability

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INCORPORATING PROCESSOR COSTS IN OPTIMIZING THE distributed EXECUTION OF JOIN QUERIES

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MATHEMATICAL AND computer MODELLING 1994年第3期20卷 7-29页

作者： REID, DJ Distributed Systems Technology Centre Department of Computer Science The University of Queensland St. Lucia Queensland 4072 Australia

The processing of a join query in a distributed environment exacts the usage of both the network and its computational facilities. A formulation that accounts for both, and felicitously constructed as an integer linear program, is proposed. Information disseminated among the sites of a distributed system is to be amalgamated and presented to a user, in response to his request. From all possible strategies by which this might be achieved, one necessitating the smallest usage of system resources is to be chosen. The data transferal resources of the network are usually presumed to be of greatest significance, and therefore, an optimal strategy is most often defined to be one which minimizes the total transmission cost. One model conforming to this philosophy, appearing in [1), expediently takes the form of a linear integer program, and so forms the basis for further refinement. In the omission of processing costs, the various processor elements of the network are treated homologously;dissimilarities in processing ability are also ignored. By analyzing the nature of join computations at a single processor, the minimal transmission cost model can be hybridized to incorporate the cost of such computations and differences in processing power.

关键词： distributed DATABASE SYSTEM INTEGER LINEAR PROGRAM JOIN QUERY RELATIONAL DATABASE

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OPTIMAL distributed EXECUTION OF JOIN QUERIES

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computerS & MATHEMATICS WITH APPLICATIONS 1994年第11期27卷 27-40页

作者： REID, DJ Distributed Systems Technology Centre Department of Computer Science The University of Queensland St. Lucia Queensland 4072 Australia

It is proposed that the execution of a chain query in a distributed system can be usefully and appropriately modeled as an integer linear program. In response to a user request, information in the form of relational tables scattered across the network is to be combined and made available to the user. The formulation initially attained by considering the behavior of the distributed system in processing such a query is then reduced by removing redundant linear constraints, to produce a model of minimal transmission cost execution. In view of varying properties displayed by the possibly many optima of this problem, further attention is devoted to discriminating between them. By perturbing the objective function, those solutions requiring fewer network transmissions can be favored at the expense of equal-cost, but more complicated, strategies. This includes those strategies that may specify the transmission of a relation around a cycle;when the costs of transmission between sites forming the cycle are zero, such a solution might otherwise be optimal. Many different ways have been devised to solve programs having some number of variables restricted to taking only integer values in some interval, and virtually any of these might be used to solve the join query model. One possible method, using a tree-search approach, is discussed here.

关键词： distributed DATABASE SYSTEM INTEGER LINEAR PROGRAM JOIN QUERY SIMPLEX METHODS TREE-SEARCH ALGORITHM

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Enhancing interoperability of DCE applications: a type management approach

Enhancing interoperability of DCE applications: a type manag...

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International Workshop on Services in distributed and Networked Environments

作者： C.J. Biggs W. Brookes J. Indulska CRC for Distributed Systems Technology Department of Computer Science University of Queensland Brisbane QLD Australia

Presents an enhancement to the OSF DCE platform for distributed computing that is designed to enhance the interoperability of applications. Concepts from open distributed processing (ODP) have been taken, extended and applied to DCE, to improve the capacity for late binding, system evolution, resource discovery and software reusability. This paper analyzes approaches to application interoperability in a number of distributed computing platforms and based on the results, describes an enhancement for the DCE platform. The paper focuses on one component of this enhancement: a type manager that is able to canonically describe types of interacting objects and types of relationships between them.< >

关键词： distributed computing Application software distributed processing Large-scale systems Open systems computer science Object oriented modeling Standards development Cyclic redundancy check Paper technology

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Towards cooperative user interfaces: an object-oriented application integration approach

Towards cooperative user interfaces: an object-oriented appl...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Hung Wing R.M. Colomb CRC for Distributed Systems Technology Department of Computer Science University of Queensland Brisbane QLD Australia

The development of a cooperative user interface is a vital and interesting issue due to the lack of common access and limited sharing of data among applications. In this paper, we propose a new design framework which can be used as a platform to access and integrate applications in a cooperative manner. In particular, the paper describes how applications can be integrated by using an object-oriented database approach. With this approach, the mapping between the application input/output streams and the database objects promotes the transparency of information transfer among applications.

关键词： User interfaces Object oriented databases Application software distributed databases distributed computing Object oriented modeling Protocols Cyclic redundancy check computer science Postal services

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Parallel naive and semi-naive transitive closure evaluation

Parallel naive and semi-naive transitive closure evaluation

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International Conference on Computing and Information (ICCI)

作者： Xiaofang Zhou M.E. Orlowska CRC for Distributed Systems Technology and Department of Computer Science University of Queensland Brisbane QLD Australia

Transitive closure operation is an important extension to relational algebra. The two most well-known methods to compute transitive closure are naive and semi-naive approaches. We give the optimal parallel versions of... 详细信息

关键词： Deductive databases Relational databases Database languages Cyclic redundancy check computer science Algebra Performance evaluation Linear systems Equations Pattern recognition

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An ODP-based approach to overcoming heterogeneity in wide area networks

An ODP-based approach to overcoming heterogeneity in wide ar...

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IEEE Singapore International Conference on Networks

作者： W. Brookes J. Indulska CRC for Distributed Systems Technology Department of Computer Science University of Queensland Saint Lucia QLD Australia

computer networks are growing in number and capacity, and internetworking allows users to access services globally. An inherent problem of such large networks is managing the heterogeneity of applications, hardware and supporting software. Open distributed Processing (ODP) introduces type description and type management functions as a mechanism for overcoming this heterogeneity. This paper considers issues surrounding the construction of an ODP-based type manager. It sets requirements for such a type manager and describes a canonical type model for ODP-based systems. The functionality and structure of the type manager are given and then this approach is compared with the type management facilities in existing platforms for distributed computing.

关键词： Intelligent networks Wide area networks Application software computer network management Resource management Runtime distributed processing Cyclic redundancy check computer science Hardware

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A distributed Lisp programming system: Implementation and usage 12

A distributed Lisp programming system: Implementation and us...

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12th International Conference on distributed Computing systems, ICDCS 1992

作者： Pearson, Mark P. Dasgupta, Partha Distributed Systems Laboratory College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States Department of Computer Science and Engineering Arizona State University TempeAZ85287-5406 United States

The implementation details of a Lisp environment built on top of a distributed operating system are presented. The system provides transparent distribution, protected large-grain persistent heaps, concurrency within e... 详细信息

ISBN: (纸本)0818628650

关键词： distributed computer systems

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A distributed Lisp programming system: implementation and usage

A distributed Lisp programming system: implementation and us...

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International Conference on distributed Computing systems

作者： M.P. Pearson P. Dasgupta Distributed Systems Laboratory College of Computing Georgia Institute of Technology Atlanta GA USA Department of Computer Science and Engineering Arizona State University Tempe AZ USA

关键词： distributed computing Concurrent computing Data structures Runtime environment Educational institutions Protection Workstations Hardware Programming profession Terminology

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CLIDE: a distributed, symbolic programming system based on large-grained persistent objects

CLIDE: a distributed, symbolic programming system based on l...

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International Conference on distributed Computing systems

Clouds LISP distributed environments (CLIDE) is a distributed, persistent object-based symbolic programming system being implemented on the Clouds distributed operating system. LISP environment instances are stored as large-grained persistent objects, enabling users on many machines to share the contents of these environments through interenvironment evaluations. CLIDE provides a comprehensive research environment for distributed symbolic language, invocation and consistency semantics, and an implementation vehicle for the construction of the symbolic processing portions of complex megaprogrammed systems.< >

关键词： distributed computing Operating systems Application software Artificial intelligence Computational modeling Multiprocessing systems Educational institutions Cloud computing Vehicles Object oriented programming

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