学术报告

题目： Processing Ad-Hoc Queries in Wireless Sensor Networks

Speaker:Prof. Haengrae Cho

Department of Computer Engineering, Yeungnam University

Republic of Korea

Time: 10:00AM-11:00AM, FEB. 28, 2009

(28日周六上午10点－11点)

Place: B202# of Teaching Bldg, East campus

(东校区教学楼B202室)

Abstract:

A wireless sensor network (WSN) consists of a large number of sensor nodes that can measure and process data while communicating through wireless channels. In this talk, we propose a hybrid query processing (HQP) algorithm for user queries submitted to the WSN. Unlike previous algorithms that consider continuous queries only, HQP supports both continuous queries and ad-hoc queries. Specially, HQP tries to reduce energy consumption of ad-hoc queries by using query results cached at each sensor node which are created during the execution of the previous continuous queries. HQP can also exploit a trade-off between energy consumption and data accuracy. We compare the performance of HQP with previous algorithms using our simulation model. The experiment results show that HQP outperforms previous algorithms in most cases. Furthermore, HQP performs better when there are a large number of sensor nodes in the WSN or the accuracy requirement of ad-hoc queries is low.

About the Speaker:

Prof. Haengrae Cho received the B.S. degree in computer engineering from Seoul National University in 1988, and the M.S. degree and the Ph.D. degree in computer science from Korea Advanced Institute of Science and Technology, in 1990 and 1995, respectively. He is currently a professor in the department of Computer Engineering at Yeungnam University, Korea. His research interests include parallel and distributed processing, real-time system, mobile computing, and performance modeling.

2009-02-25