Xingfa Shen

Hangzhou University, Hang-hsien, Zhejiang Sheng, China

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Publications (8)0.8 Total impact

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    ABSTRACT: Ranging is a basic distance estimation for many range-based localization approaches, which are important to wireless sensor networks (WSNs) applications at many levels. In this paper, we propose a simple frequency-detected based time difference of arrival (FD-TDoA), which can be implemented by detecting acoustic frequency to compute the time of flight in air. Furthermore, we put forward a new acoustic ranging solution named time of arrival (TOA)2, which can be applied to WSNs with asynchronous nodes. Unlike other published works, the design of TOA2 uses a bidirectional acoustic signal exchange between a pair of communication nodes. This technique is significantly simple and effective. The latency between the time at which the Mica2 is commanded to emit an acoustic pulse and the earliest possible time that can be detected anywhere, is considered in our solutions. The error of these ranging solutions, the correction expressions by fitted lines and the sensitivity on hardware are analyzed by a large number of experiments based on a resource-constrained Mica2 hardware platform. Copyright © 2008 Curtin University of Technology and John Wiley & Sons, Ltd.
    Asia-Pacific Journal of Chemical Engineering 10/2008; 3(6):589 - 596. · 0.80 Impact Factor
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    EURASIP J. Adv. Sig. Proc. 01/2008; 2008.
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    Xingfa Shen, Jiming Chen, Youxian Sun
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    ABSTRACT: This paper describes a basic coverage issue, and proposes a scheme named Grid Scan which is applied to calculate the basic coverage rate with arbitrary sensing radius of each node. Based on Grid Scan, a re-deployment approach is suggested to meet any k-covered rate in some region according to application requirements. The objective of our re-deployment scheme is to get equivalent coverage rate using less number of sensor nodes or to achieve higher coverage rate with the same number of sensor nodes. The results of simulation experiments support that Grid Scan based re-deployment is more effective to cover monitored area than random spread.
    Communications, 2006. ICC '06. IEEE International Conference on; 07/2006
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    ABSTRACT: In distributed control system (DCS), computation tasks, which usually reside in different nodes and communicate with one another to accomplish a common goal, have to be executed timely. Therefore, there is a need for special-purposed real-time industrial networks. Foundation Fieldbus (FF) is characterized by explicitly distinguishing between periodic and aperiodic messages. Centralized Media Access Control (MAC) is utilized by FF to support periodic messages, and distributed MAC to support aperiodic messages. It is indicated that FF's current mechanism using Pass Token (PT) priority and PT circulation period cannot effectively guarantee the real-time requirement of important aperiodic messages. A detailed analysis shows the method of computing Actual PT Circulation Period (APTCP) should be improved. An improved method of computing APTCP is proposed in this paper, and then a method of determining Setting PT Circulation Period (SPTCP) is presented accordingly. In the end, simulation validates the effect of the improved method on the real-time performance of urgent aperiodic messages in FF.
    Computer Standards & Interfaces. 01/2005; 27:105-115.
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    ABSTRACT: A multitude of applications of wireless sensor networks require that the sensor nodes be location-aware. Range-based localization schemes are sometimes not feasible due to hardware cost and resource restriction of the sensor nodes. As cost-efficient solutions, range-free localization schemes are more attractive for large-scale networks. This paper presents Weighted Centriod (W-Centriod), a novel range-free localization scheme extended on the basis of Centroid scheme, which takes received signal strength indicator (RSSI) metric into account besides connectivity metric used in Centroid scheme. It's shown that our W-Centriod method outperforms Centriod scheme significantly in terms of both the average localization error and the uniformity of error distribution across different positions, which decrease by 49.3% and by 37.7%, respectively, under the best circumstance. Moreover, a two-phase localization approach consisting of a field data collection phase and an off-line parameter optimization phase is proposed for localization in wireless sensor networks.
    Advances in Intelligent Computing, International Conference on Intelligent Computing, ICIC 2005, Hefei, China, August 23-26, 2005, Proceedings, Part II; 01/2005
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    ABSTRACT: The case where multiple control tasks share one embedded CPU is considered. For various reasons, both execution times of these tasks and CPU workload are uncertain and imprecise. To attack this issue, a fuzzy logic based feedback scheduling approach is suggested. The sampling periods of control tasks are periodically adjusted with respect to uncertain resource availability. A simple period rescaling algorithm is employed, and the available CPU resource is dynamically allocated in an intelligent fashion. Thanks to the inherent capacity of fuzzy logic to formalize control algorithms that can tolerate imprecision and uncertainty, the proposed approach provides runtime flexibility to quality of control (QoC) management. Preliminary simulations highlight the benefits of the fuzzy logic based feedback scheduler.
    Advances in Intelligent Computing, International Conference on Intelligent Computing, ICIC 2005, Hefei, China, August 23-26, 2005, Proceedings, Part II; 01/2005
  • Xingfa Shen, Zhi Wang, Youxian Sun
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    ABSTRACT: We provide an in-depth study of applying wireless sensor networks (WSNs) to real-world industrial applications. Firstly, we present problem statement of industrial automation and design requirements and goals. Second, we describe a set of sample scenarios in industrial application. Then, a system design and implementation overview is developed that covers the network architecture, hardware, software, and some design and implementation issues. In the end, we give a lot of related work in this field and conclude.
    Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on; 07/2004
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    ABSTRACT: Recent advances in wireless sensor networks have led to many new routing protocols specifically designed for sensor networks where energy awareness is an essential consideration. At first, this paper gives a short overview of recent routing protocols for sensor networks and presents a classification for the various approaches. The four main categories explored in this paper are data-centric, hierarchical, location-based, and network flow and QoS-aware. Then, the existing hardware research platforms are explored as well as the software platforms such as simulation and development tools. Next, our study plan including platform, object and method is presented. In the end, the paper concludes with some open research issues
    Intelligent Control and Automation, 2006. WCICA 2006. The Sixth World Congress on;

Publication Stats

64 Citations
0.80 Total Impact Points

Institutions

  • 2008
    • Hangzhou University
      Hang-hsien, Zhejiang Sheng, China
    • Hangzhou Dianzi University
      Hang-hsien, Zhejiang Sheng, China
  • 2004–2008
    • Zhejiang University
      • • Institute of Industrial Process Control
      • • Institute of Modern Control Engineering
      Hangzhou, Zhejiang Sheng, China