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Xiao Y.,China Coal Pingshuo Group Ltd. | Xiao Y.,Chinese Academy of Sciences | Jiang H.,CAS Chengdu Institute of Biology | Jiang H.,Chinese Academy of Sciences
Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University | Year: 2014

To solve the data storage reliability problem of the unattended wireless sensor network consisting of n sensor nodes, this paper proposes a new distributed storage algorithm based on parallel directional random walk with length cn. The proposed algorithm disseminates each of k source data packets in the network according to a given probability and formes a stored data packet in every node. Simulation results show that, after the storage process based on the proposed algorithm is completed, even if some stored data packets are missing, the data collector node can successfully recover the k source data packets from any survival k+ε, ε≥11 stored data packets. Compared with the LT codes based algorithm, the proposed algorithm reduces Sink node's query cost from k+100 to k+11 and reduces the network's communication cost from 3n ln n to 3n. Source


Jiang Y.-L.,China Coal Pingshuo Group Ltd. | Pan J.,China Coal Pingshuo Group Ltd. | He Y.-Q.,China Coal Pingshuo Group Ltd. | Huang G.-J.,China Coal Pingshuo Group Ltd.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

Based on the shrinking face project and roof support problem of intersection of roadway at fully mechanized top coal caving face in the No. 2 Deep Mine of Pingshuo, the stress and displacement fields of surrounding rock of the roadway intersection are calculated and analyzed by FLAC3D three-dimensional numerical simulation software. By compared with site monitoring data, the rule of the intersection of roadway roof's variation are obtained and analyzed. The result shows that the roadway height of intersection could not be ensured in the present support condition. Therefore, the roof of intersection should be reinforced to meet the security of support. After reinforced supporting, the roof deformation has been effectively controlled, which could ensure the roadway height of intersection during shrinking face. Source

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