Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route whi...Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.展开更多
目的基于野生小家鼠来源1号染色体替换系群体(population of specific chromosome 1 substitution strains,PCSSs)中18个品系的全基因组重测序结果,鉴定1号染色体上的缺失突变并对其进行功能注释。方法采用Illumina二代测序平台获取18...目的基于野生小家鼠来源1号染色体替换系群体(population of specific chromosome 1 substitution strains,PCSSs)中18个品系的全基因组重测序结果,鉴定1号染色体上的缺失突变并对其进行功能注释。方法采用Illumina二代测序平台获取18个品系的全基因组序列信息,通过Speed Seq软件鉴定缺失突变,进一步利用Snp Eff软件完成功能注释。结果在18个品系的1号染色体上共检测到13 803个缺失突变。缺失长度从51 bp到70 kb不等,其中长度<500 bp的缺失突变约占总数的50%。多数缺失突变位于内含子区(50.361%)和基因间隔区(28.745%)。发现31个蛋白编码基因含有功能性缺失,其中有3个基因和人类疾病相关,7个基因参与了11条KEGG通路。结论 PCSSs的1号染色体上含有丰富的缺失突变,是在研究复杂性状的重要遗传标记。展开更多
摘要Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.