摘要：Secure and private authentication protocol is important in Radio Frequency Identification (RFID) *** date,researchers have proposed many RFID authentication ***,these protocols have many flaws due to lack of theoretical support in designing these *** this work,first we present the security and privacy requirements in RFID authentication *** we examine related works and point out problems in designing RFID authentication *** solve these problems,we propose and briefly prove three *** also give necessary examples for better understanding these theorems with concrete *** last,we give our suggestions on designing secure and private authentication *** security and privacy requirements,theorems,and suggestions will facilitate better understanding and designing of RFID authentication protocols in the future.

摘要：民用建筑工程的防排烟系统可以对人民生命安全以及财产安全起到一定的保障作用,目前防排烟系统可以被分为三类:机械加压送风防排烟系统、自然排烟系统以及机械排烟系统。如果没有对其进行有效的设计以及施工,就非常容易引发人员伤亡事故。所以,怎样对民用建筑工程防排烟系统进程合理设计,是现阶段的一项主要工作。本文主要对建筑工程防排烟系统中比较常见的几个问题进行分析研究。

摘要：《义务教育语文课程标准》提出：＂教师要精心设计作业,要有启发性,分量要适中,不要让学生机械抄写,以利于减轻学生负担。＂然而,时下的语文作业却少了创造新意,多了机械重复;少了思维训练,多了抄抄写写;少了课堂延伸,多了应试色彩。笔者认为,教师不妨赋予语文作业趣味性、自主性、生活性、诗韵性,让小学语文作业洋溢着蓬勃的＂绿色＂。

摘要：目的:寻找一种胃癌的三维适形计划设计方案。方法:通过对胃癌的靶区以肾脏上缘为界分成上下两端,每段设计相应的治疗计划后,再通过融合计划达到总的治疗计划方案。结果:该方案简单明了,步骤清晰,靶区适合度及正常组织保护良好。结论:对目前没有条件做IMRT的医院有着积极重要的意义。