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内容説明 This book constitutes the refereed proceedings of the 4th European Workshop on Wireless Sensor Networks， EWSN 2007， held in Delft， The Netherlands in January 2007. The 22 revised full papers presented were carefully reviewed and selected from 164 submissions. The papers are organized in topical sections on networking， tracking， algorithms， applications and support， medium access control， os and tools， as well as localization.