casa 15(3): e3

Research Article

Applying Log Data to Context-Awareness in Home Network System

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  • @ARTICLE{10.4108/casa.2.3.e3,
        author={Yuichi Watanabe and Shinsuke Matsumoto and Sachio Saiki and Masahide Nakamura},
        title={Applying Log Data to Context-Awareness in Home Network System},
        journal={EAI Endorsed Transactions on Context-aware Systems and Applications},
        keywords={home network system, context-aware service, house log},
  • Yuichi Watanabe
    Shinsuke Matsumoto
    Sachio Saiki
    Masahide Nakamura
    Year: 2015
    Applying Log Data to Context-Awareness in Home Network System
    DOI: 10.4108/casa.2.3.e3
Yuichi Watanabe1,*, Shinsuke Matsumoto1, Sachio Saiki1, Masahide Nakamura1
  • 1: Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
*Contact email: nabe@ws.cs


In the conventional context-aware services of the home network system (HNS), every context has been defined by current (or recent) situations only. Considering past situations in a house would significantly extend the expressive power of the context-aware services. In this paper, we propose a new type of context, called log context, by using house log of the HNS, extensively. The log context is defined with both the current and past situations, where the current situation is obtained by sensors or device status of the HNS while the past situations are derived by queries to the house log. We also develop a system that can derive the log contexts within an actual HNS. To manage individual log contexts efficiently, the system is designed by four layers: application layer, log context layer, log query layer, and DB connector layer. To evaluate the execution performance of our system, we have conducted an experiment which measures execution time of some variety of log queries.