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Li Y.,Henan Polytechnic University | Zhang Y.,Jiaozuo Coal Industrial Group CO.
2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012 | Year: 2012

Data mining techniques have been successfully applied in stock, insurance, medicine, banking and retailing domains. In the sport domain, for transforming sport data into actionable knowledge, coaches can use data mining techniques to plan training sessions more effectively, and to reduce the impact of testing activity on athletes. This paper presents one such model, which uses clustering techniques, such as improved K-Means, Expectation-Maximization (EM), DBSCAN, COBWEB and hierarchical clustering approaches to analyze sport physiological data collected during incremental tests. Through analyzing the progress of a test session, the authors assign the tested athlete to a group of athletes and evaluate these groups to support the planning of training sessions. © 2012 IEEE.

Guo D.-Y.,China University of Mining and Technology | Lu P.-F.,China University of Mining and Technology | Shan Z.-Y.,Jiaozuo Coal Industrial Group Co. | Xie An,China University of Mining and Technology
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2013

Based on coal seam deep-hole cumulative blasting experiments in Jiulishan Coal Mine of Jiaozuo Coal Group, the law of stress change in a blasting coal body was analyzed by numerical simulation. It is found that cumulative blasting effect leads to the increase of peak stress and enlarges the crack zone range of the coal body. Drilling parameters for cumulative blasting, such as blast hole diameter, blast hole spacing, distance between the blast hole and the adjacent gas drainage hole, and distance from the blast hole to the coal seam roof and floor, were determined by optimization. Field experimental results show that after using these optimized drilling parameters the cumulative blasting not only gets remarkable permeability increasing effect but also ensures blasting safety.

Guo D.-Y.,China University of Mining and Technology | Lu P.-F.,China University of Mining and Technology | Pei H.-B.,China University of Mining and Technology | Shan Z.-Y.,Jiaozuo Coal Industrial Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Based on the field experiments of coal bed deep-hole cumulative blasting, nonlinear dynamic analysis finite element software ANSYS/LS-DYNA was applied to simulate splitting process, investigate coal body mechanical behavior and crack propagating mechanism under cumulative blasting. The studies show that blasting changes coal body stress state, and cumulative effect leads to significant changes of mechanical property in cumulative direction. Furthermore, crush zone range in cumulative direction is relatively smaller, but crack propagating range is distinctly larger than that in the non-cumulative direction.

Chen Y.,China University of Mining and Technology | Bai J.-B.,China University of Mining and Technology | Zhu T.-L.,China University of Mining and Technology | Yan S.,China University of Mining and Technology | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

The stability control of roadside support body is the key to keep gob-side entry retaining stable. According to the structural mechanics model of gob-side entry retaining overlying strata, the paper analyzes the load and deformation characteristics of roadside support in the three stages and obtains supporting mechanism of roadside support as follows. Roadside support body could support the roof instantly by increasing support resistance in the setting stage, meets the requirement of cutting off a certain height of the roof before a periodic abutment loading at the back of working face, and has a large deformation capacity during overlying strata movement and a high post-strength after stability of overlying strata movement. Based on the above investigations and the geological conditions of panel 24021 in Jiulishan colliery, we analyze the effect of support body width on the performance of a gob-side entry retaining, and determine a rational width of support body in the condition of support parameters and filling materials. Research results are successfully applied to a field practice.

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