Mobile computing has the potential for managing information globally. Data management issues in mobile computing have received some attention in recent times, and the design of adaptive broadcast protocols has been po...
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Mobile computing has the potential for managing information globally. Data management issues in mobile computing have received some attention in recent times, and the design of adaptive broadcast protocols has been posed as an important problem. Such protocols are employed by database servers to decide on the content of broadcasts dynamically, in response to client mobility and demand patterns. In this paper we design such protocols and also propose efficient retrieval strategies that may be employed by clients to download information from broadcasts. The goal is to design cooperative strategies between server and client to provide access to information in such a way as to minimize energy expenditure by clients. We evaluate the performance of our protocols both analytically and through simulation.
We propose and analyze a class of admission control algorithms based on reward optimization for multimedia servers designed to provide on-demand services to clients in an environment where workload characteristics of ...
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We propose and analyze a class of admission control algorithms based on reward optimization for multimedia servers designed to provide on-demand services to clients in an environment where workload characteristics of clients can change dynamically. These admission control algorithms are developed based on two strategic choices, namely, "deterministic" or "best-effort" regarding quality of service (QoS) control, and "priority-reservation" or "no priority-reservation" regarding reservation control. We first formulate the design of admission control algorithms for real-time multimedia servers as a reward optimization problem, with the "reward" referring to the value which the system receives after servicing prioritized clients based on the QoS requested and delivered. Then, we derive closed-form solutions for the reward rate expressions which the system can possibly obtain as a result of applying these admission control algorithms and validate the analytical results with a simulated VBR video server. A physical interpretation is given for the best combination of strategic choices under which the system can obtain the best reward as a function of workload and cost characteristics of the clients. We demonstrate that the reward value which the system receives under our proposed admission control algorithms at optimizing conditions can be much higher than those under traditional admission control algorithms which do not consider reward optimization. (C) 1998 Elsevier Science B.V. All rights reserved.
The 1990s are witnessing the rapid growth of client/server (C/S) computing, but for an organization to benefit from a CIS model, it should ensure that the processing architecture matches its information needs. Researc...
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The 1990s are witnessing the rapid growth of client/server (C/S) computing, but for an organization to benefit from a CIS model, it should ensure that the processing architecture matches its information needs. Researchers have suggested that organizations moving to this model should identify their information requirements, and then determine the appropriate architectures to support them. This study utilizes information processing theory to examine the match between an organization's information processing requirements and its C/S architectures. The independent variables in this study are task characteristics, and the processing architectures. The dependent variable is effectiveness. The data for this study was obtained from C/S managers and users in a variety of industries, through a combination of archival data, telephone interviews, and a mailed survey. It was analyzed using hierarchical regression. The results indicate that an appropriate match between task characteristics and C/S processing architectures is an important determinant of system effectiveness. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
This paper describes a re-engineering project undertaken by a comprehensive university's extended education department. The project involved a transition from a decentralized workplace dominated by Macintosh perso...
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Heterogeneous concurrent computing has emerged in recent times as an effective platform for high performance applications as well as for traditional distributed computing, Performance and functionality that such metho...
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Heterogeneous concurrent computing has emerged in recent times as an effective platform for high performance applications as well as for traditional distributed computing, Performance and functionality that such methodologies can provide, as well as their limitations and potential, have become reasonably well understood. In this paper, we discuss some selected aspects of heterogeneous computing in the context of the PVM system, and describe evolutionary enhancements to the system, These extensions, which involve performance optimization, light-weight processes, and client-server computing, suggest useful directions that the next generation of heterogeneous systems might follow, A prototype design of such a next-generation heterogeneous computing framework is also discussed.
Conversion to client/server systems from host-centric systems can be accomplished with careful attention to planning and development procedures. A key component in a successful conversion is a customized definition of...
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Conversion to client/server systems from host-centric systems can be accomplished with careful attention to planning and development procedures. A key component in a successful conversion is a customized definition of client/server which complements the organization's mission. Another key component is the development of an infrastructure which includes hardware, software and people. The training of users and design personnel is crucial to successful conversion. Discusses definitions, strategies, hardware, software, and the pitfalls to be avoided.
Looks at how Pacific tailored a new client/server-based capacity planning system to enable Courtaulds Clothing to meet demand in the competitive fashion marketplace. Considers two applications:detailed capacity planni...
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Looks at how Pacific tailored a new client/server-based capacity planning system to enable Courtaulds Clothing to meet demand in the competitive fashion marketplace. Considers two applications:detailed capacity planning (DCP) and ease-of-use (EOU), which went live at the company in May 1996, and reports on their success.
Describes the development and implementation of a new client/server-based tooth planning system at Dentsply, a dental product manufacturer. Details the problems faced in implementing the system, and its benefits to th...
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Describes the development and implementation of a new client/server-based tooth planning system at Dentsply, a dental product manufacturer. Details the problems faced in implementing the system, and its benefits to the company.
Draws on research carried out by the Nolan Norton Institute in Australia. Presents findings of applied research into PC and desktop management issues. Presents data on costs and other management metrics associated wit...
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