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Articles by Huijun Wang
Total Records ( 2 ) for Huijun Wang
  Dong Xie , Song Tang , Jie Xiao , Huijun Wang and Jianbo Wang
  Radio Frequency Identification (RFID) technology is widely used to trace objects. However, RFID application systems can not effectively and efficiently use massive uncertain data. This study considers some properties of objects captured by sensor and GPS and proposes a comprehensive extensible model for uncertain data according to key features of RFID data which is suitable to different application scenarios. The model can effectively and efficiently store different RFID data according to key features of RFID data and supports a variety of queries for tracking and tracing RFID objects.
  Dong Xie , Song Tang , Huijun Wang , Guangjun Guo and Yun Cheng
  Inconsistency may arise when data are integrated together with respect to a given set of integrity constraints. Many techniques can identify inconsistent data by ad-hoc ways but inconsistent data can not be managed effectively. To judge a query is rewritable, the work analyses whether the join graph for the query is directed. Also, the work presents an approach for computing tuple probabilities and a basic technique for query rewriting. The experiments use the data and queries of the TPC-H specification to compare performance for degrees of inconsistencies and the results show that the approach is effective and feasible.
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