简介:通过分析ZigBee协议中Cluster—Tree和AODVjr算法的优缺点,提出一种基于Cluster—Tree+AODvjr的优化路由算法。该算法利用ZigBee协议中的邻居表,通过定义分区来确定目的节点的范围,从而控制广播RREQ分组的跳数,防止无效的RREQ泛洪。此优化算法能够有效地减小路由跳数,缩短传输时延,减少网络中死亡节点的数量,提高数据传送的成功率。
简介:中药方剂即中药复方,是中国中医药实践经验和智慧的结晶,几千年来已积累中药方剂达十余万首,而如何利用这一巨大的方剂库,开发研制新的安全有效的方剂,是一亟待解决的问题.数据挖掘技术的出现及利用这一技术对中药方剂配伍规律进行发掘,既能大力推动中国中医信息化建设,又可快速发现隐含在方剂库中的重要的知识,也能为中医学走向世界提供强有力的技术支持,因此对中药方剂进行数据挖掘不仅是有必要的,更具有实际意义.
简介:Chinafacesseverechallengesintheyearsaheadtoitsfamilyplanningprogramasthecountryundergoeshistorictransformations,however,thegovernmentisreadytomeetthosechallengeswithnewstrategies.TheseremarksweremadebyZhangWeiqing,ministeroftheStateFamilyPlanningComm...
简介:fruit and gingerbread.The popularity of the Christmas tree grew in Britain during the first half of the 20th century,which was too heavy and kept breaking. It was only in the mid 20th century that a viable alternative was found.Artificial trees were invented in the 1880's in a bid to try and stop some of the damage being caused to real trees due to people lopping the tip off large trees,Martin Luther (the founder of the Protestant religion) was the first to decorate an indoor tree with candles when he attempted to recreate the stars shining over a forest of evergreens.The first mention of decorated trees being taken indoors came in 1605 in Germany - a country with a long Christmas tree history
简介:fruit and gingerbread.The popularity of the Christmas tree grew in Britain during the first half of the 20th century,which was too heavy and kept breaking. It was only in the mid 20th century that a viable alternative was found.Artificial trees were invented in the 1880's in a bid to try and stop some of the damage being caused to real trees due to people lopping the tip off large trees,Martin Luther (the founder of the Protestant religion) was the first to decorate an indoor tree with candles when he attempted to recreate the stars shining over a forest of evergreens.The first mention of decorated trees being taken indoors came in 1605 in Germany - a country with a long Christmas tree history