상세정보
학술지
An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks
- 발행일
- 201204
- 출처
- Sensors, v.12 no.4, pp.3997-4015
- ISSN
- 1424-8220
- 출판사
- MDPI AG
- 협약과제
- 12MC1200, V2X 네트워킹 및 응용기술과 Geo 시멘틱 표준개발, 이소연
- 초록
- In a wireless sensor network, sensors collect data about natural phenomena and transmit them to a server in real-time. Many studies have been conducted focusing on the processing of continuous queries in an approximate form. However, this approach is difficult to apply to environmental applications which require the correct data to be stored. In this paper, we propose a weather monitoring system for handling and storing the sensor data stream in real-time in order to support continuous spatial and/or temporal queries. In our system, we exploit two time-based insertion methods to store the sensor data stream and reduce the number of managed tuples, without losing any of the raw data which are useful for queries, by using the sensors' temporal attributes. In addition, we offer a method for reducing the cost of the join operations used in processing spatiotemporal queries by filtering out a list of irrelevant sensors from query range before making a join operation. In the results of the performance evaluation, the number of tuples obtained from the data stream is reduced by about 30% in comparison to a na챦ve approach, thereby decreasing the query execution time. © 2012 by the authors; licensee MDPI, Basel, Switzerland.
- KSP 제안 키워드
- Continuous queries, Data stream, Environmental applications, Environmental monitoring system, Natural phenomena, Performance evaluation, Query execution time, Real-Time, Static wireless sensor networks(WSNs), Time Based, Weather Monitoring System
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