1Design of Wireless Tracking and Positioning System of Underground Personnel Based on WiFi and ZigBeeJIANG Lei, YU Lei, WANG Zhen-chong, ZHANG Yi-chiAchievements of Science and Research1-62Design of Signal Transmission of Mine Locomotive Based on Leakage Communication TechnologyWEI Zhen, LI Chao-hai, TANG Jun, TANG Zhao-guang, ZHAO Hui-junAchievements of Science and Research6-83Design of Information Authentication System of Driver of Rubber-tyred VehicleLIU Li-jingAchievements of Science and Research9-114Design of Frequency-conversion Speed-regulation Device of Continuous ShearerMAO Jin-liangAchievements of Science and Research11-145Design of Acquisition and Analysis System of Load Data of Bolt and CableHUANG Jin-bo, LIANG Peng, WANG Qing-niu, WANG De-weiAchievements of Science and Research15-186Modeling Research of Coal Mine Disaster Predicting System Based on Markov ChainGUO Qiu-min, XU BoAnalysis Research18-237Renovation and Optimization of Operation Mode of Dual-circuit Power Supply System in Coal MineLI FuAnalysis Research24-268Probe on Fully Distributed Control Structure of Coal Preparation PlantXING Mei-su, HOU Lu-junAnalysis Research26-289Probe on Design of Management Information System of Coal Preparation PlantZHOU Guo-binAnalysis Research29-3210Brief Analysis of Leakage Protection System of Coal Preparation PlantZHANG Bo, LI Yan-chongAnalysis Research32-3311Current Situation and Development Trend of Database TechnologyZHANG Jun, WU Shao-huiAnalysis Research34-3612Research of Routing Protocol for Wireless Sensor Network in Mine Gob AreaXI Qiang, ZHU Jin-guangLaboratory Research37-4013Probe on Feasibility of Application of Multi-point Optical Fiber Gas Sensor System in Coal MineJIANG Ze, LIU Mao-rongLaboratory Research41-4414Research of Layered Overlay Multicast Technology Based on Immune AlgorithmZHAO Liang, HE Yao-yi, WANG Yong, CHEN Xiao-linLaboratory Research44-4915Analysis of Delay of Message Transmission of Profibus-DP Single Master-station SystemKONG Wei-sheLaboratory Research50-5316Speed Measuring Method of Underground Locomotive Based on Image Processing TechnologyZHANG Chuan-kai, LI Yu-liang, LIU Jing-yuanLaboratory Research53-5617Low-speed Sensorless Control Technology of PMSM Based on Dual PWM RegulatorsREN Ju-yong, GU Shan-maoLaboratory Research57-6118Application Research of Image Processing in Gas Monitoring of Coal MineWANG Meng, LI Yu-liang, WANG Qing-feiLaboratory Research61-6419Research of Fully Automatic Control System of Rapid Quantitative Loading StationSUN Guo-shun, ZHANG Xin, QI MeiLaboratory Research65-6720Application Research of SVM in Risk Assessment of Coal MarketingJIA Yan-feng, WANG Chun-lei, XIE Hai-dong, WANG Zhi-dongLaboratory Research68-71 