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Scalable architecture for parallel distributed implementation of genetic programming on network of workstations

JOURNAL OF SYSTEMS ARCHITECTURE 2001年第7期47卷 557-572页

作者： Tanev, I Uozumi, T Ono, K Muroran Inst Technol Dept Comp Sci & Syst Engn Muroran Hokkaido 0508585 Japan

We present an approach for developing a scalable architecture for parallel distributed implementation of genetic programming (PDIGP). The approach is based on exploitation of the inherent parallelism among semi-isolated subpopulations in genetic programming (GP). Proposed implementation runs on cost-efficient configurations of networks on workstations in LAN and Internet environment. Developed architecture features single global migration broker and centralized manager of the semi-isolated subpopulations, which contribute to achieving quick propagation of the globally fittest individuals among the subpopulations, reducing the performance demands to the communication network, and achieving flexibility in system configurations by introducing dynamically scaling up opportunities. PDIGP exploits distributed component object model (DCOM) as a communication paradigm, which as a true system model offers generic support for the issues of naming, locating and protecting the distributed entities in proposed architecture of PDIGP. Experimentally obtained results of computational effort of proposed PDIGP are discussed. The results show that computational effort of PDIGP marginally differs from the computational effort in canonical panmictic GP evolving single large population. For PDIGP running on systems configurations with 16 workstations the computational effort is less than panmictic GP, while for smaller configurations it is insignificantly more. Analytically obtained and empirically proved results of the speedup of computational performance indicate that PDIGP features linear, close to ideal characteristics. Experimentally obtained results of PDIGP running on configurations with eight workstations show close to 8-fold overall speedup. These results are consistent with the anticipated cumulative effect of the insignificant increase of computational effort for the considered configuration and the close to linear speedup of computational performance. (C) 2001 Elsevier Scienc

关键词： genetic programming distributed component object model island model of parallelism network of workstations

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Role-based access control in DCOM

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JOURNAL OF SYSTEMS ARCHITECTURE 2000年第13期46卷 1175-1184页

作者： Ahn, GJ Univ N Carolina Dept Comp Sci Charlotte NC 28223 USA

The explosive growth of the Web, the increasing popularity of PCs and the advances in high-speed network access have brought distributed computing into the mainstream. To simplify network programming and to realize component-based software architecture, distributed object models have emerged as standards. One of those models is distributed component object model (DCOM) which is a protocol that enables software components to communicate directly over a network in a reliable, and efficient manner. In this paper, we investigate an aspect of DCOM concerning software architecture and security mechanism. Also, we describe the concept of role-based access control (RBAC) which began with multi-user and multi-application on-line systems pioneered in the 1970s. And we investigate how we can enforce the role-based access control as a security provider within DCOM, specially in access security policy. (C) 2000 Elsevier Science B.V. All rights reserved.

关键词： access control Micro computer distributed component object model security mechanism Online Systems object oriented programming multi-user Role Concept Software architecture Network programming Personal computers aspect

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Parallel genetic programming: component object-based distributed collaborative approach 15

Parallel genetic programming: Component object-based distrib...

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15th International Conference on Information Networking (ICON-15)

作者： Tanev, I Uozumi, T Ono, K Muroran Inst Technol Dept Comp Sci & Syst Engn Muroran Hokkaido 0508585 Japan

ISBN: (纸本)0769509525

We discuss the feasibility of applying the distributed collaborative approach for improving the computational performance of generic programming (GP), implemented on cost-efficient clusters or the Internet. Proposed approach exploits the coarse grained inherent parallelism, in GP among relatively autonomous subpopulations. Developed architecture of distributed collaborative parallel GP (DCPGP) features single, global migration broker and centralized manager of the semi-isolated subpopulations, which contribute to quick propagation of the globally fittest individuals among the subpopulations, reducing the performance demands to the underlying communication network, and achieving dynamic scaling-up features. DCPGP exploits the distributed component object model (DCOM) as a communication paradigm, which as a true system model offers generic support for the issues of naming, locating and security of communicating entities of developed architecture. Experimentally obtained speedup results shaw that close to linear speedup characteristics of the prototype of DCPGP are achieved on network of 8 workstations.

关键词： genetic programming distributed collaboration distributed component object model

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distributed objects 99

distributed Objects

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1999 International Conference on Softeare Engineering

作者： Wolfgang Emmerich Neil Roodyn Dept. of Computer Science University College London London WC1E 6BT UK Cognitech Ltd. City Cloisters 188-194 Old Street London EC1V 9FR UK

ISBN: (纸本)9781581130744

This tutorial motivates the need for, and discusses the principles of object-oriented distribution middleware. We will give an overview how these principles are supported by the major incarnations of object-oriented middleware, the object Management Group's Common object Request Broker Architecture (CORBA), Microsoft's distributed component object model (DCOM) and Java's Remote Method Invocation (RMI). We will discuss common design problems that occur when building applications using distriubted objects and present techniques for their solution.

关键词： design problems Common object request broker architecture distributed component object model BUILDING APPLICATION Principle-Based Ethics object orientation Middleware

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