1Research of Key Technologies of Communication for Underground Wireless Sensor NetworksHU Sheng-boLaboratory Research1-42Development of a High-performance Transient Electromagnetic ReceiverCHEN Zhong-ren, CHEN Fang-jing, WANG HuiLaboratory Research5-83Establishment of Fault Data Warehouse of Mine Local Ventilation System Based on OLAPYANG Wu-cheng, SUN Jun-ru, ZHANG Wu-gangLaboratory Research9-114Research of Field Test for Performance Curve of Mine-used Counter-rotating Axial VentilatorCHEN Geng-lin, YANG Sheng-qiang, YAN Zhao-fenLaboratory Research12-145Research of Model of Hidden Trouble Recognizing and Early Warning for Natural Mine Disaster Based on GISZHANG Bai-hui, YANG Ming-qiangLaboratory Research15-186Research of Selcctive Distance Protection of Traveling Wave for Underground High-voltage Power NetworkTIAN Shu, ZHANG Sheng-chaoLaboratory Research19-237Research of Modulation and Demodulation of Inbound Signal of Two-way Automatic CommunicationYANG Ling-xiao, LI NaLaboratory Research23-268Research of a New Kind of BUCK DC-DC ConverterHUANG Jin-feng, DONG Feng-binLaboratory Research27-309Current Status and Development Tendency of Monitoring and Fault Diagnosis of Emulsion PumpHOU Yong-bo, HAN Xiao-mingOverview35-3710Design of Mine Monitoring System Based on ZigBee Wireless Sensor NetworkWEI Zuo-hui, AI Hui-mingTechnical Progress41-4311Design of a Portable Tester for Tension of Mine-used Wire RopeWANG Kun, FAN Zhao-fengTechnical Progress43-4512Rescarch of Fuzzy Control of Air Valve Based on PLCYU Chun-feng, ZHANG Tian-kaiTechnical Progress54-5613Research of Distributed Data Communication System Based on DCOMPEI Fei, HUA GangTechnical Progress59-6214Design of Coal Mine Materials Management System Like as a Supermarket and Its ImplementationPEI Xiao-fei, LUO Qu-bo, JIA Zhi-yong, SONG Wei, ZHU Jian-binTechnical Progress65-6715Design of Voice Eealy Warning System of MG200/500-WD ShearerDONG Feng, ZHANG Fu-jianTechnical Progress68-6916Research of Realizing Communication between Non-central-switch Calling SystemsWANG Meng, MIAO Chang-yun, WU Zhi-gangTechnical Progress73-7617Design of Wireless Multichannel Current Collection System Based on nRF401LI Ai-qiuTechnical Progress80-8218Design of Unitive Early Warning Platform of Integrated Message in Coal MineHE Yao-yiTechnical Exchange89-9119Multi-motor Control System Based on DSPHE Hong-jiang, WANG Fei-pengTechnical Exchange92-9420Application of Master-slave Substation Type PLC Network in Signal Centralized and Locking SystemQI Xian-ying, ZHANG Ming-haiTechnical Exchange126-128 