Survey on Connectivity with Mobile Elements in WSNs

节点连通性是无线传感器网络研究的热点问题之一,然而由于节点能量耗尽、硬件故障以及通信链路失效等问题的存在,造成网络分割,因此如何确保网络连通成为; 无线传感器网络亟待解决的关键性问题.近年来,一个新的研究趋势是通过引入计算能力较强且能量较为充足的移动性节点来进行连通控制,提高无线传感器网络的; 整体性能.本文对目前利用移动性节点的主流连通控制方法进行了充分调研,通过对这些方法的详细分类和比较,归纳了移动式连通控制的各类方法的特点,分析了; 这些方法的性能和适用范围,总结了研究中存在的主要问题与挑战,并指出了未来可能的研究方向.The connectivity of sensors is one of the main research problems in; wireless sensor networks (WSNs).Data can be forwarded through connected; sensor nodes.However,becauseof energy depletion,hardware failure and; communication link failure,the network may be partitioned.How to; guarantee the connectivity becomes an urgent issue in wireless sensor; networks.Traditional work usually focuses on maximizing the connectivity; with minimum sensors.In recent years,a new research trend is to utilize; mobile elements for connectivity control.Since the mobile element is; more powerful than normal sensors,it improves the performance of many; aspectsin wireless sensor networks.In this paper,we makea comprehensive; investigation about the current major connectivity control methods with; mobile elements.We first summarize the characteristics of mobile; topology control methods via a new classification.Based on the; classification,these methods are compared to each other according to a; serial parameters.Finally,we analyze the performances and the; application scopes of these methods,summarize the main problems,and; point out the future research directions.国家"九七三"重点基础研究发展计划项目; 国家科技支撑计划项目; 国家自然科学基金项目; 福建省科技计划重点项目; 福建省自然科学基金计划项

Research on Techniques of Segmentation and Registration of DSA-CT Living Liver images

虚拟肝脏手术计划系统能够提供可交互操作的平台，仿真模拟手术过程，从而有助于制定合理的个体化手术方案，可以降低损伤肝脏重要结构的危险,减少术后肝功能不全的发生率。 作为虚拟肝脏手术计划系统的组成部分，本文探索的是基于计算机断层扫描(ComputedTomography，CT)图像及数字减影血管造影(DigitalSubtractedAngiography，DSA)图像中的肝血管的分割配准问题。首先对CT图像的肝实质进行分割，再进一步分割出肝实质中的血管，且对DSA图像中的血管进行分割；然后，对CT血管进行三维重建，选取部分角度进行投影，将投影结果与DSA图像进行配准，并在配准结果中选取与DSA...Virtual liver surgery Planning System can provide a platform for inter-operation, Simulate surgical procedures, thereby contribute to the development of individualized reasonable surgical program. It can reduce the risk of injury of important structures of liver; can reduce the incidence of Postoperative liver function. As an integral part of Virtual liver surgery Planning System, the exploration...学位：工学硕士院系专业：信息科学与技术学院计算机科学系_计算机系统结构学号：2302006115242

Business Model Research For Pay TV

中国广播影视行业的数字化工程是国家在“十五”计划期间的战略规划。当前，全国各省市电视台基本上已经完成了数字化改造，从观众的角度来看，数字化技术能带来电视节目数量与质量的极大丰富，这意味着观众拥有了更多的对电视节目的选择权；而从经营者的角度来看，技术的革新对传统的“节目+广告”的商务模式形成了严峻的挑战，迅速增加的电视节目需要一种新的商务模式才能使其存在并发展下去。目前，国内的许多电视台已经开始经营付费电视，也就是说，他们在尝试直接向用户收取收视费用，摆脱对广告收入的依赖。 福建电视台早在2000年就开始了付费电视的试运营，但由于诸多客观以及主观的原因，这项业务一直开展得不理想，而国内的其他付...Digitalization for radio、film and television industry is a constituent of national development strategy in the Tenth five-year Plan. Digital updates have been completed so far in provincial and municipal TV stations in Mainland China. From consumers’ point of view, digital improvement brings about varieties of TV programs. As a result, viewers enjoy more choices to TV programs; on the other hand, ...学位：管理学硕士院系专业：管理学院工商管理教育中心（MBA中心）_工商管理硕士(MBA)学号：20041523

Improvement of Malate Order Management in the ERP Environment

随着科学技术及物流的飞速发展，产品数量增多，种类变得更丰富甚至供应速度也不断提升。市场也从卖家市场不断的转化为买家市场。销售订单作为产品类型及物流前端，如何做好订单管理就更加重要，且值得研究。在此之中，制造企业为了谋取更好的经营效果，要适应现有发展的情况，单纯的选择传统预测运作模式，已经不能满足当前的发展需求，越来越多的企业喜欢选择更顺应时代发展潮流的面向订单的生产方式。与此同时，ERP理论不断完善，ERP系统商家不断增多。选取适合自己企业的ERP系统，践行于企业订单管理工作中，将会取得更好的实践价值。 本文首先介绍了订单管理优化及ERP理论、系统国内外的发展。万利达订单管理现状，对其进行深...With rapid development in transportation, science and technology, the products quantity and range increased, as well as the supplying rate. The supply-oriented market has been transferred to demand-oriented market. It is more important to manage well the order which is the origin of production and logistics. In among, it’s not workable to survive in the current market competition and gain better p...学位：管理学硕士院系专业：管理学院_工程硕士(物流工程)学号：X201115300

Research on clustering coefficient in RGG model of wireless Ad Hoc network

在影响无线网络同步的因素中,网络拓扑结构逐渐引起人们的关注。通过研究rgg模型中网络聚类系数和网络次大特征值之间的关系,来探索聚类系数对网络收敛性能的影响程度,并希望从有边界效应和无边界效应两种情况入手对其进行研究。通过仿真实验发现在无边界情况下的聚类系数是一个常数,与其他因素无关,有边界情况下其值与环境参数相关。从理论上推导了无边界聚类系数的理论值,并给出了有边界情况下的推导思路。In the factors that affect wireless network synchronization,the network topology structure gradually draws attention of researchers.By studying the relationship between network clustering coefficient and the secondary largest eigenvalue in RGG model,the effect of network clustering coefficient on network convergence performance was explored under two conditions with and without boundary effect.Through the simulation,it is found that the clustering coefficient under the borderless condition is a constant,which is not related to other factors,and the clustering coefficient with boundary effect is related to the environment parameter.The theoretical value of clustering coefficient without boundary effect is derived theoretically.The thought of derivation with boundary effect is offered.国家自然科学基金(61201196); 教育部博士点基金(20100121120020); 福建省自然科学基金(2012J05127

Design and Implementation of Online Invoice Management System Based on PKI

发票管理系统是地税征管业务系统中的重要组成部分之一，是税务机关实现以票控税的重要手段。然而，当前地税发票管理手段和技术还很落后，还停留在手工管理和物理防伪的阶段，一方面加大了税务机关日常管理的难度，另一方面也为不法分子伪造发票、违法用票提供了便利，使税务机关税源监控和税管的质量大大降低。 基于上述原因，作者结合某市地税工作实际，参与开发网络发票信息系统，充分利用信息化，采用纳税人网上开具发票的新模式，来提高税务机关发票管理能力。 本系统主要解决了三方面问题，一是纳税人可以通过网络发票系统开具发票，实现了地税机关对纳税人用票信息的实时采集和实时监控。二是将PKI技术应用到网络发票系统中，很好...Invoice management system is one of the components of local tax collection business and important measure of implementation controlling tax by tax authorities. However, the current invoice management tools and technology of the Local Tax Bureau is still lagging behind, still stuck in a simple technical manual management and physicalsecurity of the stage, on the one hand to increase the local tax ...学位：工程硕士院系专业：软件学院_计算机技术学号：X201023065