Published by the IEEE Computer Society
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G. Cao is with the Department of Computer Science and Engineering, Pennsylvanis State University, University Park, PA 16802.
M. Singhal is with the Department of Computer and Information Science, Ohio State University, Columbus, OH 43210.
Manuscript received 1 Mar. 2000; revised 1 Aug. 2000; accepted 15 Aug. 2000.
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