基于共同邻居邻域拓扑稠密性加权的链路预测方法

链路预测旨在利用已知的网络节点和拓扑结构信息,预测网络中未连接的两个节点之间存在连边的可能性。基于网络拓扑相似性的链路预测方法计算复杂度低且预测效果好,但现有的相似性指标对共同邻居的邻域拓扑信息考虑较少。针对此问题,提出一种基于共同邻居邻域拓扑稠密性加权的链路预测方法。首先,基于邻域拓扑相对稠密指数量化节点的邻域拓扑结构;然后,利用共同邻居的节点度和邻域拓扑相对稠密指数刻画共同邻居及其邻域拓扑的相似性贡献;最后,提出基于共同邻居邻域拓扑稠密性加权的节点相似性指标。在多个实际网络数据上的实验结果表明,与现有相似性指标相比,该方法能够取得更高的预测精度。     

Topological design of a distributed computer communication network in a noisy environment

The effect of noisy links is considered in the design of a computer communication network topology. Because of noisy links, and the consequent probability of bit error, additional network traffic in the form of acknowledgement packets and retransmission packets are generated which load the network. A topological design procedure for obtaining a minimum cost network is proposed which satisfies given constraints of overall network delay, maximum delay on a link, throughput and reliability. Traffic priority for different classes of traffic is also taken into consideration in the design. As expected, the network cost increases as the bit error probability of the links increases.     

二次分级连接排序算法

近年来，人们提出了不少排序运算量为Ｏ（Ｎ）的新算法。但对这些算法分析研究的结果表明，普遍存在着以下两点不足：（１）附加空间开销大；（２）排序效率过分依赖于键值的均匀分布。对此，本文提出了一个排序算法－二次分级连接排序法。该方法保证排序时间在最坏下为Ｏ（Ｎ）的基础上，仅需附加空间开销Ｎ＋√△Ｍ＋２。这里，△Ｍ为键值的变化范围。     

绩效考核工作的探索与思考

绩效考核是人力资源管理的一个核心内容 ,从构筑适应本公司绩效管理的有效体系入手 ,让绩效考核与人力资源管理的其它环节相互联结、相互促进 ,形成企业人力资源管理的良性机制     

HI－13串列加速器输电梯的研制

输电梯是ＨＩ－１３串列加速器的关键设备之一，其主要部件尼龙绝缘子无油轴承等经反复试制，性能已优于国外同类产品。研制过程中创立的输电梯组装工艺大大简化了调梯过程，降低了横向摆度。３５００多小时的正式运行表明输电梯运行平稳，高压性能良好。ＨＩ－１３串列加速器达到了非常良好的运行状态。     

Capacity of the WCDMA System Using High Altitude Platform Stations

In this paper, we provide a method to estimate the capacity of the wideband code division multiple access (WCDMA) scheme using High Altitude Platform Stations (HAPS), and demonstrate the results. This is to validate that the HAPS system is one of the most effective solutions to provide high quality wireless communication services, such as IMT-2000 services. We use a practical system model which describes the HAPS system most appropriately, and this leads to realistic estimation results. We estimate the reverse and forward link capacity of the HAPS WCDMA system and compare it to that of the terrestrial system. The estimation results show that the capacity of the HAPS WCDMA system is about 1.2–1.67 times larger than that of the terrestrial system.     

Heuristics for Diverse Routing in Wavelength-Routed Networks with Shared Risk Link Groups

In this paper, we consider path protection in wavelength-routed networks with shared risk link groups (SRLGs). Specifically, we study diverse routing, where two paths without sharing any SRLG have to be found between each pair of source–destination nodes, and its applications in dynamic shared protection as well. For the NP-complete diverse routing problem, a heuristic method is proposed, which steadily outperforms an existing algorithm within the first few iterations. When more iterations of calculations are allowed, we demonstrate that the two different algorithms perform nearly the same. This interesting observation helps to achieve some insight into how to further improve the performance of the heuristics in the future.     

码分多址反向链路调度算法与处理时延的关系

研究了码分多址反向链路数据传输采用不同的调度算法受系统处理时延影响的程度，这种影响与信道估计误差有关，也与传输速率的更新时间有关。通过对CDMA2000的动态系统级仿真，其结果显示反向链路上的最大速率与轮询结合的算法、最小路径损耗算法、以及轮询算法在有处理时延时吞吐量性能都会降低，其中最大速率与轮询结合的算法降低的程度最小，轮询算法降低程度最大，最小路径损耗算法介于中间。性能降低也与快衰信道类型相关，信道变化越快算法性能受到的影响越大。提出了一种对调度算法的改进方法，即根据移动台处理时延的变化，为近期处理时延较小的移动台分配更多的资源，结果表明该方法改善了系统吞吐量。     

Sb_2O_3掺杂对YBa_2Cu_3O_（7－δ）超导性质的影响

研究了Ｓｂ２Ｏ３掺杂的多晶ＹＢａ２Ｃｕ２Ｏ７－δ超导体的超导转变温度和输运临界电流密度Ｊｃ（Ｂ）在磁场中的行为。测量了超导性能对该掺杂浓度的依赖关系。适当浓度的掺杂可使Ｊｃ至少提高一个数量级。对掺杂样品进行了扫描电镜微结构观测和Ｘ射线结构分析。     

基于C^4ISR系统的数据链技术

伴随C^4ISR系统的发展，战术数据链的重要性越来越受到重视。在综合阐述数据链定义、特征、发展动因、工作机理和重要作用的基础之上，比较具有代表性的4种数据链的技术体制，并结合现代先进技术和未来作战需求，预测了战术数据链的发展趋势。