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近些年来随着计算机技术的发展,我国的网络计算机技术取得了巨大的进步。但是,网络计算机没有本地储存特性,计算机系统中部署数字证书系统时实体终端需要私钥数据储存的矛盾依旧存在。基于这种矛盾,研究人员提出并设计了服务端密钥存储的网络计算机数字证书系统基础架构,这种系统架构在服务终端利用生成密钥和加解密操作的方式更加有效地实现了系统的可拓性,同时也可以极大的提高系统的安全性。 相似文献
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在利用ASP开发应用系统时,会有一些关于服务端和客户端的特殊要求。本文作者针对其在开发实践中所遇到的一些问题进行了分析,并给出了解决的办法。 相似文献
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移动EDI体系结构设计是设计与实现移动支付系统的首要基础,总结了目前建立移动EDI系统的关键技术,分析了基于移动EDI技术的电子商务系统应用集成问题,描述了移动EDI通用数据转换构件系统的功能架构与评价指标,论述了基于XML的EDI系统的架构方案,提出了基于Web Service的EDI-XML转换构件的实现算法,该算法可以使移动EDI具有良好的结构化交互功能. 相似文献
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在分析当前高校数字校园建设面临的问题的基础上,提出了采用面向服务的体系结构SOA(service-oriented architecture)和社交网络服务SNS(Social Networking Services)构建下一代数字校园的构想。基于SOA架构进行现有系统集成、整合以及新系统建设;在系统的应用层,分析了SNS与教育活动的适用性,提出了以校园SNS为核心构建应用服务系统的基本方案。SOA架构提供的数字校园发展必需的灵活性和可扩展性,结合以SNS为虚拟核心的校园应用系统,将为校园用户提供教学、学习、科研、社会服务以及校园生活的最佳数字平台。 相似文献
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文章从电信运营商大力发展移动社区的必要性出发,分别对移动社区的现状、特点、模式、开放平台等方面展开分析,提出了开发移动社区需要的关键技术,如WebApp、开放API、基于组件的开发等。文章提出采用符合轻量级、易于扩展和聚合的WOA(面向网络架构)的设计理念,描绘并分析移动社区平台的体系架构,从而为运营商发展移动社区奠定了坚实的技术基础。 相似文献
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Pan Liu Wei Zhou 《International Journal of Satellite Communications and Networking》2019,37(6):551-560
The complex communication network of satellite navigation system (SNS‐CCN) possesses the characteristics such as large scale, complicated architecture, and integrated satellite earth. Composite modeling and simulation take significant roles in solving large‐scale system simulation issues, as far as one concerned, the solution has not been proposed in the field of SNS‐CCN yet. According to the simulation of information flow for SNS‐CCN, this paper proposes a composite framework of simulation model based on SMP2.0 while applied with combination modeling methods, and then proposes a development and integration method for component structure and simulation service structure, which can support the composite modeling and make appropriate simulation service extensions according to the request. Then, we develop an information flow verification simulation system for SNS‐CCN with the proposed development and integration method of simulation model. 相似文献
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Yonal Kirsal Enver Ever Altan Kocyigit Orhan Gemikonakli Glenford Mapp 《Wireless Personal Communications》2014,79(2):1247-1276
In recent years, there has been an increased interest in the integration of different technologies in heterogeneous environments. Modelling heterogeneous systems is a complex task and handover schemes should consider issues such as network coverage, mobility, and Quality of Service (QoS). Analytical models are useful to deal with this complexity. This paper presents a generic framework to model handover in heterogeneous environments for performance evaluation of different handover schemes. The model developed considers mobility of the users, coverage radius of the networks as well as decision making probabilities about handover between the two networks. The interaction between cellular mobile technologies is considered and handover between a WLAN and a cellular system is analysed using the proposed model. Two stage open networks can be used to model this kind of integrated systems. The cellular mobile technologies are modelled as a multi-channel queuing system while the WLAN is depicted as a single channel queuing system, both with finite buffers. The exact spectral expansion method is employed to solve the models. Simulation is also employed for the proposed systems and used for validation of the accuracy of the proposed models. Numerical results are presented for mean queue length and blocking probabilities for each system. The results of this study show that QoS measures of such systems can be evaluated efficiently and accurately, using the proposed analytical model and its solution. In addition, it can be used as a framework in heterogeneous environments and can also be adapted to various types of networks in interaction. 相似文献
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移动位置服务系统设计 总被引:1,自引:0,他引:1
为了更好地说明目前在定位系统中常用的移动位置服务系统,采用软件设计的方法,对LBS体系结构的框架进行了分析,按照LBS系统体系要求,设计了LBS服务器端系统功能,通过实验测试,达到原定系统设计要求。说明移动位置服务系统在定位系统中的重要作用,其性能将直接决定定位系统的性能。设计的移动位置服务系统结构完整,性能优良,达到目前定位系统的各项要求。 相似文献
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提出了一个面向下一代网络电视的多媒体展示框架中间件的设计。在多媒体展示领域中提出了一个概念,即将后台基础设施架设在云端,并在客户端以中间件形式实现支持软件平台,并重点介绍了客户端多媒体展示框架中间件的设计。在该中间件的基础上进一步开发了一个网络多媒体广告应用实例。分析和实验结果表明,该中间件具有稳健性、跨平台性、透明性和可扩展性等特点。 相似文献
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Internet service providers(ISPs) have taken some measures to reduce intolerable inter-ISP peer-to-peer(P2P) traffic costs,therefore user experiences of various P2P applications have been affected.The recently emerging offline downloading service seeks to improve user experience by using dedicate servers to cache requested files and provide high-speed uploading.However,with rapid increase in user population,the server-side bandwidth resource of offline downloading system is expected to be insufficient in the near future.We propose a novel complementary caching scheme with the goal of mitigating inter-ISP traffic,alleviating the load on servers of Internet applications and enhancing user experience.Both architecture and caching algorithm are presented in this paper.On the one hand,with full knowledge of P2P file sharing system and offline downloading service,the infrastructure of complementary caching is designed to conveniently be deployed and work together with existing platforms.The co-operational mechanisms among different major components are also included.On the other hand,with in-depth understanding of traffic characteristics that are relevant to caching,we develop complementary caching algorithm with respect to the density of requests,the redundancy of file and file size.Since such relevant information can be real-time captured in our design,the proposed policy can be implemented to guide the storage and replacement of caching unities.Based on real-world traces over 3 months,we demonstrate that the complementary caching scheme is capable to achieve the ’three-win’ objective.That is,for P2P downloading,over 50% of traffic is redirected to cache;for offline downloading,the average server-dependence of tasks drops from 0.71 to 0.32;for user experience,the average P2P transfer rate is increased by more than 50 KB/s. 相似文献
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对CORBA和移动代理技术进行了深入研究,在分析了两种网管技术的优势和不足的基础上.提出了一个基于CORBA和移动代理技术的综合网管模型。网管模型利用Java虚拟机作为运行平台.ORB作为底层通信设施,根据网络规模对两种网管模式性能的影响,在不同网管任务中分别使用CORBA对象和移动代理。 相似文献