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Articles by Yun Cheng
Total Records ( 2 ) for Yun Cheng
  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.
  Yun Cheng , Minlei Xiao , Wenpi Wang and Lin Chen
  In this study, we have demonstrated two schemes for the generation of millimeter-wave (mm-wave) using optical frequency sixupler with a dual-electrode modulator (MZM). For scheme one and scheme two, the phase of RF signal is shifted by 180 degrees, drives the two electrodes of MZM at different bias levels and then high order sidebands is removed by optical bandpass filter. Theoretical analysis and simulation results show that the performance of millimeter-wave for scheme two is better than that of scheme one.
 
 
 
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