1Research of Method of Sensors Management of Coal Mine Monitoring and Control System Oriented to Information FusionGAO Li, HU Yan-jun, YU Hong-zhenLaboratory Research1-42Research of Data Model and Data Structure of Integrated Management of Coal Mine Geospatial DataYANG Ming-qiang, JU Zun-zhouLaboratory Research5-93Research of Anti-collision Algorithm for Personnel Position System of Coal Mine Underground Based on WSNLI Fan-jia, XU Zhao, YAN Bing-lei, TIAN Chuan-gengLaboratory Research9-124Research of Routing Protocols of ZigBee Wireless Sensor Networks of Coal Mine UndergroundJIA Yun-hongLaboratory Research13-165Design of Temperature Monitoring System of BGP9L-6G High-voltage SwitchboardGAN HuiLaboratory Research17-206Design of Synchronous Circuit of Intelligent Soft Starter Based on 80C196MCGUO Tao, ZENG Yi, ZHANG Xiao, LI Yun-xiaLaboratory Research20-227Research of Direct Torque Control for Reducing Current RippleLaboratory Research23-268Design of 360° Angle Sensor Based on CORDIC AlgorithmZHANG Yong, MA Jin-yuanLaboratory Research26-299Design and Simulation of Temperature Controller for Calcining Zone of Rotary KilnSHANG Dan, GAO Yong-qingLaboratory Research30-3210Present Situation and Development of Wireless Communication System of Coal MineCHEN Xiang-yuanOverview33-3611Research of Harmonic Pollution of Power Electronic Equipment and Its Suppression StrategyOverview36-3912Design of a New Type of Intelligent Low-voltage Feed SwitchLIU De-jun, TIAN Fu-taiTechnical Progress40-4213Design of an Intelligent Protection and Control System for Dual Power Supplies and Dual FansTechnical Progress42-4514Development of Coal-seam Gas Pressure Monitor Based on ATmega64LLI Yong, LI Fu-lingTechnical Progress46-4915Research of a New Type of Mine Leakage Detecting Device Based on Dual CPUsTechnical Progress49-5116Design of Compartment Location Monitoring Device in Automatic Loading SystemZHOU Gu-ming, LEI Ru-hai, WANG JunTechnical Progress52-5417Application of Orthogonal List in Developing Power Supply Graph of Coal Mine by VisioTechnical Progress54-5618Design of Monitoring and Early Warning System for Coal Mine Grid Disaster and Its ImplementationTechnical Progress57-5919Development of Equipment of Measuring Low Coal Level and Preventing Blockage of Coal BunkerLI Yan-min, ZHANG Yin-xia, LI Da-leiTechnical Exchange60-6320Design of an Intelligent Alarming Device for Detecting Flammable GasTechnical Exchange63-65 