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Articles by Qi Liu
Total Records ( 2 ) for Qi Liu
  Huan Liu , Baowei Wang , Xingming Sun , Tao Li , Qi Liu and Yunbiao Guo
  The technology of Wireless Sensor Network (WSN) has facilitated the meteorological parameter monitoring. To reduce the cost, most monitoring systems collect desired data through cheap, unprofessional meteorological equipments, so do our system. However, due to the low cost of equipments and the poor package, the data collected by unprofessional equipments is inaccurate. In this study, we propose a Data Correction Scheme for Cheap Sensor (DCSCS) to improve data accuracy. The Discrete Wavelet Transform algorithm is used to filter the collected data to clear the noise and find the data pattern. Then we use Back Propagation neural network to establish a data correction model. Finally, we use the model to correct the other data. Our experiment shows that the meteorological data corrected by our method performs a very good result both in maximum error, mean error and correlation coefficient.
  Junhua Chen , Qi Liu , Jian Yu and Yajing Zheng
  The locomotive layout which is extremely hard to modify after the construction, has direct impact on the daily transport efficiency and economic benefit of the railway transportation company. Therefore, it should be optimized once the rail network pattern is changed. The regional heavy haul rail network is a half open transportation system. Constant changes exist in the long period. As a result, the modification of locomotive system productivity layout is hard to be timely and effective. This problem differs from the normal logistic location problem and has complex influencing factors. Existing literatures mainly focus on the qualitative solutions which cannot precisely show the advantages and disadvantages of the alternative solutions and lack enough persuasion. The two key points of this problem is (1) Reasonable and reliable index system and (2) Feasible and practical models and algorithms. The numerical example takes the regional heavy haul rail network of Shenhua Group. The evaluation index system that can reflect the random factors is built. Then the model and the corresponding algorithm that can comprehensively evaluate the alternative solutions are proposed, through the combination of the fuzzy analytical hierarchy process and gray correlation analysis method. The locomotive layout optimization results conform to the reality well and promote the locomotive operational efficiency which will have positive impact on the development of the long-locomotive-line operation mode.
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