校园电视台的设计与设备选型     

安金梁  杜留锋 《中国现代教育装备》2007,(12):14-15

本文从校园电视台的设计原则与设备的选型入手,分析了在建设校园电视台过程中应注意的问题。  相似文献   

Distributed localization algorithm for wireless sensor network based on multidimensional scaling and the shortest path distance correction   总被引：1，自引：0，他引：1  

丁英强  杜留锋  杨挺  孙雨耕 《天津大学学报(英文版)》2009,15(4):237-244

Sensor localization is crucial for the configuration and applications of wireless sensor network (WSN). A novel distributed localization algorithm, MDS-DC was proposed for wireless sensor network based on multidimensional scaling (MDS) and the shortest path distance correction. In MDS-DC, several local positioning regions with reasonable distribution were firstly constructed by an adaptive search algorithm, which ensures the mergence between the local relative maps of the adjacent local position regions and can reduce the number of common nodes in the network. Then, based on the relationships between the estimated distances and actual distances of anchors, the distance estimation vectors of sensors around anchors were corrected in each local positioning region. During the computations of the local relative coordinates, an iterative process, which is the combination of classical MDS algorithm and SMACOF algorithm, was applied. Finally, the global relative positions or absolute positions of sensors were obtained through merging the relative maps of all local positioning regions. Simulation results show that MDS-DC has better performances in positioning precision, energy efficiency and robustness to range error, which can meet the requirements of applications for sensor localization in WSN.  相似文献   

GSM/WCDMA混合组网与漫游技术的研究     

田熙燕  杜留锋 《河南科技学院学报》2007,35(3):66-68

移动通信网络由2G向3G演进初期，两代网络将混合共存。本文从3G网元的建设、2G网络的升级及2G／3G网间的互操作过程等多个方面分析了GSM／WCDMA混合组网的相关技术，并针对混合组网互操作过程中的漫游问题，提出了两种技术方案。  相似文献   

力矩电机智能化控制器设计     

杜留锋  安金梁  苗青林 《大众科技》2007,(8):131-132,152

本文设计了一种采用单片机控制晶闸管实现三相调压的智能控制器.移相触发模块采用了新型的TC787控制晶闸管,实现调压的同时还能实现节能和多种保护.系统具有良好的输入输出界面.与模拟控制器相比,操作简便、维护费低.  相似文献   

高校开设双语教学的关键环节   总被引：3，自引：0，他引：3  

余泽通  杜留锋 《河南职业技术师范学院学报(职业教育版)》2009,(3):113-114

目前,国家急需和世界各国能进行经济、科学技术交流的高级科学技术人才,因此,在高等学校本科专业开展双语教学势在必行。为保证双语教学的效果,应重视教师的任用、学生的学习态度、教材的选择和双语教学的管理等关键环节。  相似文献