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Issue No.02 - April-June (2009 vol.2)
pp: 108-121
Qianhui Liang , Singapore Management University, Singapore
Xindong Wu , Hefei University of Technology, Hefei and University of Vermont, Burlington
Hoong Chuin Lau , Singapore Management University, Singapore
Making software systems service-oriented is becoming the practice, and an increasingly large number of service systems play important roles in today's business and industry. Currently, not enough attention has been paid to the issue of optimization of service systems. In this paper, we argue that the key elements to be considered in optimizing service systems are robustness, system orientation, and being dynamic and transparent. We present our solution to optimizing service systems based on application-level QoS management. Our solution incorporates three capabilities, i.e., 1) the ability to cater to the varying rigidities on Web service QoS in distinct application domains and of various users in a robust and heuristic manner, 2) the ability to formulate the overall system utility of a service system perceived by a particular system end user and to suggest its maximization using a utility model incorporated into a three-dimensional weighting scheme, and 3) the ability to dynamically achieve a higher perceived system utility of a service system via transparent negotiations. The calculation of the system utility encompasses a negotiation algorithm and a robust search algorithm for selecting heuristically best Web services. The effectiveness of the proposed algorithms and our solution is demonstrated by simulation experiments and our demo deployment, SSO.
Optimization of services systems, quality of services, service selection, composite services, system utility, negotiation, robust.
Qianhui Liang, Xindong Wu, Hoong Chuin Lau, "Optimizing Service Systems Based on Application-Level QoS", IEEE Transactions on Services Computing, vol.2, no. 2, pp. 108-121, April-June 2009, doi:10.1109/TSC.2009.13
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