Concurrent collision probability of RFID tags in underground mine personnel position systems

According to the basic requirements of underground mine personnel position systems and the working characteristics of active RFID tags,we studied the cause of concurrent collision of RFID tags and leak reading probability,by means of theoretical analysis and computation.The result shows that the probability of wireless collision increases linearly with an increase in the number of tags.The probability of collision and leak reading can be reduced by extending the working period of the duty cycle and using a backoff algorithm.In a practical application,a working schedule for available labels has been designed according to the requirement of the project.

工程量清单编制任务组织模式研究——以项目管理技术优化工程量清单编制流程

在分析现行工程量清单与标底编制任务组织模式存在的不利因素和隐患的基础上,将编制任务看作一个项目,采用并行工作法,利用项目管理的知识、技能、工具和技术进行管理,解决编制人员短缺与工作量过大的矛盾,提高管理水平,进而提高工作效率、保证文件编制质量。