Design of a Web Site Throughput Analysis System

Web网站的流量分析系统是提高网站服务质量的可靠保证。目前,互联网上的大部份流量都是Web流量,而多数网站仅用简单的计数器来衡量其服务质量,这远远不能适应网站服务和投资评估的迫切需求。本文首先描述网站流量分析所应包含的指标体系,继而深入研究这一分析系统的具体实现技术,最后探讨了数据挖掘技术在分析系统中的可能应用。Web site throughput analysis system is a reliable guarantee for improving site service quality. At present, most throughput through the Internet is the Web throughput, and many sites estimate their service quality only by using a single counter. It is far from what is greatly needed in site services and investment estimation. This article begins with the criterion system of site throughput analysis, and then studies the specific implementation technique, and finally discusses the possibility of data mining in analysis systems

智能W eb 站点技术研究

为了使W eb 站点进一步适应当前复杂的电子商务, 必须引入智能技术. 通过融合XML 信息 交换、智能文档分析与搜索、数据库动态网页、数据仓库, 虚拟现实和流式多媒体等技术, 将能够建立 起支持生动的个性化服务、智能搜索与信息推送、实时交互与协同工作、事务处理与决策支持、通用 数据访问与数据挖掘等功能的智能站点

Real-time video transmission subsystem based on RTP

中文摘要：实时视频流技术在可视电话、远程教育、视频点播等方面得到广泛应用。网络实时视频系统一般分为4 大模 块：采集子系统、编码压缩子系统、传输控制子系统和输出子系统。其中传输控制子系统是实时视频流的一项关键核 心技术。提出了基于RTP/RTCP 协议构建实时视频传输控制子系统，传输层通信使用UDP Socket 完成。对于RTP/RTCP 协议的封装和UDP Socket 使用标准C++和Berkeley 标准Socket 库完成，不依赖于具体的平台，具有良好的可移植性。 英文摘要：The real-time video streams technology is used widely in such aspects as videophone, distance education and video on demand. The network real-time video systemis generally divided into 4 bigmodules: capturing subsystem, compressed coding subsystem, transmission and controlling subsystem and output subsystem. Among them transmission and controlling subsystem is the key technology of real-time video streams. How to built transmission and controlling subsystem is proposed based on RTP/RTCP agreement, and UDP socket is utilized to realize the communication between transport layers. Standard C++ and berkeley standard socket storehouse are used to finish the encapsulation of RTP/RTCP agreement and UDP socket. This subsystem does not depend on the concrete platform so it has good portability.基金项目：国家973 重点基础研究发展规划基金项目（G199803040803

Research on DiffSev Performance Evaluation by Simulation

中文文摘：：Internet 越来越多的多媒体实时传输业务对网络服务质量提出了更高的要求。在分析传统 的尽力而为服务不足的基础上，剖析了区分服务的体系结构和工作机制，并运用NS2 网络仿真器 构建DiffServ 的仿真模型，进行性能评价研究。DiffServ 的端到端QoS 特性难以用精确的数学模 型加以刻画，模拟方法是评价这种服务性能的有效途径。 [英文文摘]Internet real time multimedia communication issues a further challenge to IP QoS. The authors discuss some problems of current network service, and analyze the architecture of DiffServ. We focus on the research into the DiffServ performance evaluation though simulation, and present the results to check DiffServ module versatility in services definition. Keywords: IP QoS; DiffServ; RED; simulation; performance evaluation国家自然科学基金 (60175008); 国家“九七三”信息与高性能 软件的子项目 (G199803040803)

Research on the Application of Multicast A/ V Conference Technology in E2government Network

中文摘要：视频会议在政务网络中有着广泛的应用,它在要求网络支持流媒体传输的同时,还要求将传播对象分别局限 于各个特定范围内. 传统的网络会议控制系统采用多条点对点传输来实现这种多播要求,这容易导致相同路径上的 数据流拥塞. 本文探讨在政务网络中多播路由、组管理协议以及链路层环境下的多播协议的具体应用技术,旨在为 实现广泛而流畅的视频会议提供一种可行的解决方案. 英文摘要：Multicast A/ V conference technology , widely used in the e2government network ,not only requires the network can carry the st ream2media ,but also needs the t ransmitted object s are respectively located in their given range. Traditional A/ V conference cont rol system uses the multiple point2to2point t ransmission to realize it ,but this easily brings the congestion. In this paper ,the authors discuss the IP multicast routing , Internet Group Management Protocol ( IGMP) and the application of the multicast protocol in link layer ,to provide an available resolution for the comprehensive and fluent A/ V conference

Research on the Design Technology of WebGIS Based on J2EE Platform

针对传统WebGIS设计方法的局限性,利用Java平台无关性的优点,为拓展GIS在电子政务中的应用,提出了基于J2EE平台的Browser/Server模式的分布式解决方案,并以一个城市电子地图为例,着重探讨了J2EE平台上采用中间件(MapXtreme)设计和架构应用于电子政务的WebGIS的思想,主要包括客户端的选择、功能考虑以及服务器端的结构设计等,并据此提供了一个原型.该原型的建立及其设计的思想方法对于其他更为复杂的WebGIS的开发具有借鉴意义.After analyzing the localization of the traditional designing technologies in WebGIS,taking advantage of the platform-free characteristic of Java,for expanding the GIS applications in e-Government,this article provides an available distributed solution in Browser/Server model,based on J2EE platform.Taking an electronic map of city as an example,the article discussed the designing methods and configuration in WebGIS,which can be applied in e-Government,based on J2EE platform using middleware(MapXtreme),mainly including the choice of client,the designing consideration in client side and the structure designing in server side.According to that,the article provides a prototype.The prototype and the designing methods are helpful for other more complicated WebGIS.国家“九七三”信息与高性能软件的子项目(G199803040803)资

Study on the Technologies of Intelligent Web Site

为了使 Web站点进一步适应当前复杂的电子商务 ,必须引入智能技术 .通过融合 XML信息交换、智能文档分析与搜索、数据库动态网页、数据仓库 ,虚拟现实和流式多媒体等技术 ,将能够建立起支持生动的个性化服务、智能搜索与信息推送、实时交互与协同工作、事务处理与决策支持、通用数据访问与数据挖掘等功能的智能站点 .In order to make the Web sited more suitable for the increasing complex tasks of E-commerce, the Web site should be more intelligent than it is now. By integrating the technologies of Information exchange based on XML, intelligent documents analysis and search engine,dynamic web pages, Data Warehouse, virtual reality and stream media, we can build up an powerful intelligent web site that supports personalized service, intelligent search engine and information push, real-time interaction and cooperation, transaction processing and decision supporting

Research on the Design Technology of WebGIS Based on J2EE Platform

针对传统WebGIS 设计方法的局限性,利用J ava 平台无关性的优点,为拓展GIS 在电子政务中的应用,提出了基 于J2EE 平台的Browser/ Server 模式的分布式解决方案,并以一个城市电子地图为例,着重探讨了J2EE 平台上采用中间 件(MapXt reme) 设计和架构应用于电子政务的WebGIS 的思想,主要包括客户端的选择、功能考虑以及服务器端的结构 设计等,并据此提供了一个原型. 该原型的建立及其设计的思想方法对于其他更为复杂的WebGIS 的开发具有借鉴意义. [英文摘要]Af ter analyzing the localization of the t raditional designing technologies in WebGIS ,taking advantage of the platform2 f ree characteristic of J ava ,for expanding the GIS applications in e2Government ,this article provides an available dist ributed solution in Browser/ Server model ,based on J2EE platform. Taking an elect ronic map of city as an example ,the article discussed the designing methods and configuration in WebGIS ,which can be applied in e2Government , based on J2EE platform using middleware (MapX2 t reme) ,mainly including the choice of client ,the designing consideration in client side and the st ructure designing in server side. Ac2 cording to that ,the article provides a prototype. The prototype and the designing methods are helpful for other more complicated WebGIS.国家“九七三”信息与高性能软件的子项目 ( G199803040803) 资

Real-time video transmission subsystem based on RTP

实时视频流技术在可视电话、远程教育、视频点播等方面得到广泛应用。网络实时视频系统一般分为4大模块:采集子系统、编码压缩子系统、传输控制子系统和输出子系统。其中传输控制子系统是实时视频流的一项关键核心技术。提出了基于RTP/RTCP协议构建实时视频传输控制子系统,传输层通信使用UDPSocket完成。对于RTP/RTCP协议的封装和UDPSocket使用标准C++和Berkeley标准Socket库完成,不依赖于具体的平台,具有良好的可移植性。Thereal-time video streams technology is used widely in such aspects as videophone, distance education andvideo on demand. The network real-time video system is generally divided into 4big modules: capturing subsystem, compressed coding subsystem, trans- mission and controlling subsystem and output subsystem. Among them transmission and controlling subsystem is the key technology of real-time video streams. How to built transmission and controlling subsystem is proposed based on RTP/RTCP agreement, and UDP socket is utilized to realize the communication between transport layers. Standard C++ and berkeley standard socket storehouse are used to finish the encapsulation of RTP/RTCP agreement and UDP socket. This subsystem does not depend on the concrete platform so it has good portability.国家973重点基础研究发展规划基金项目(G199803040803

Information Monitoring System Design in Official Business Network

摘要: 政府办公网络可以划分为两种类型:办公内网(涉密办公网) 和办公外网(非涉密办公网) . 前者与互联网物理 隔离,后者则采用逻辑隔离. 两者对信息安全都是高度敏感的,加强对办公网信息的监控显得尤为必要. 办公网存在 的某些安全问题是一般的网络安全系统无法解决的. 本文设计了政府办公业务网信息监控系统的基本框架,内容涉 及受控计算机标志信息的收集、涉密网中违规接入互联网的监测、办公外网中异常占用带宽的监控,并对其中的关 键技术问题提出解决方案. Abstract : There are two types of official business network :private official business network (confidential offi2 cial business network) and public official business network (non2confidential official business network) . The for2 mer must be isolated physically f rom Internet and the latter should be logically isolated. For both ,the information is sensitive. So it’s necessary to intensify monitoring the information of them. This paper discusses the basic de2 sign of the official business network information monitoring system ,covering the information collection of con2 t rolled computers and the monitoring of invalid access to Internet in confidential network and exceptional band2 width in public official business network. Solutions of the key problems are found