一种改进的移动IPv6协议

在IETF制定的标准移动IPv6中,移动节点在外地网络中每移动一个新的位置就要发送一个绑定更新信息到家乡代理和相应的通信节点上,这必将导致网络总的绑定和发送代价过高,降低网络性能。本文提出了一种改进的移动IPv6协议,通过将移动节点的绑定更新分为家乡更新和本地更新两类来降低网络的绑定代价,使网络的性能得到改善。

YAFFS在雨水情遥测终端数据存储系统中的改进

在现有的雨水情遥测系统中,YAFFS文件系统在存储数据时采用异地更新策略,因而存在NAND Flash存储空间利用效率低的问题。通过在YAFFS的写操作中引入覆写方法,并结合YAFFS的ECC校验技术,实现了数据本地更新策略,提高了NAND Flash的空间利用率,实现了数据的可靠存储以及有效管理。同时,对新的数据存储策略设计了专门的实验方案,并进行了大量的测试,结果表明,存储方式的改进不仅提高了数据存储空间利用率,节省了存储时间,还保证了数据存储的准确性。

一种基于给定目标节点的个性化PageRank算法设计

以往衡量图网络节点重要性时,多基于给定源节点,计算该节点到其余目标节点的个性化PageRank值并推出重要目标节点,运算效率低且存储量大。基于此,提出了一种基于给定目标节点的个性化PageRank算法(TPPR),该算法结合本地更新与优先队列算法,通过计算从所有源节点到给定目标节点的个性化PageRank值来推出重要源节点,相较于传统算法运算精度更高,运行时间大幅减少。

Basic Farmland Plan Based on Farmland Gradation

Taking B District in A City as an example, quality classification of basic farmland was evaluated based on farmland gradation. It can be concluded from the analysis that utilization grade of basic farmland in current round was 16.82 without consideration of farmland gradation updating, and the grade enhanced by 0.08, still lower by 0.11 than that in last round, when the updating was taken into account. Finally, the reasons for problems occurred in the round were analyzed as follows： less consideration of protection on basic farmland in orientation of urban development; neglecting of basic farmland quality in Overall Plan of Land Utilization; non-classification of excellent lands after land consolidation; untimely updating of farmland gradation. In addition, the countermeasures were proposed correpondingly, including strengthening of basic farmland quality in the Plan, classification of excellent lands after consolidation, timely updating and inclusion of farmland gradation into ＂one map＂ project.