基于UMTS的QoS结构及管理策略的研究

Along with the high speed development of mobile systems communications, the research of third generation of mobile systems are in progress rapidly, UMTS is one of the much representative schemes in the global.The paper discusses the architecture and server function of the UMTS and UMTS QoS. Based on this, the paper studies emphatically UMTS QoS architecture, Structure Components, mechanism and Management scheme of each part and arithmetic.     

IP安全体系及实现

IPsec是一种基于IP层的加密安全体制，为IP及上层协议提供透明的安全保护。本文主要论述了Ipsec的理论体系及几种常用的实现方式，并给出在Windows NT和Linux平台上的两种具体实现。     

论义务教育的不公正及解决对策

现代各级教育都肩负着推进社会公正的使命,这使教育本身的公正和民主倍受瞩目。自20世纪90年代以来,教育资源的分配不公已全面、深刻地体现于教育的各个阶段和环节,其中,这种不公正在基础性的义务教育阶段表现得最为严重。最根本的解决办法是调整目前的义务教育投资体制,加强中央和省级政府对义务教育的投资责任,同时对农村贫困地区的义务教育予以政策上的倾斜和扶持。     

正确实施产业组织政策提高机械工业产业素质

通过对机械工业目前所面临的困难的分析,指出困难的根源在于生产的集约化程度不够及机械工业企业活力不足,并从增强机械部在机械工业产业调整中的地位和加快国有机械工业企业改革的角度,提出了如何正确实施机械工业产业组织政策的一些建议。     

一种基于策略的新型主动网络管理系统

基于策略的主动网络管理(PBANM)能够解决目前PBNM技术中存在的大部分问题。基于SENCOMM设计和实现了一种基于策略的主动网络管理系统，并采用智能探针作为资源发现、网络监测、策略发布和策略执行的主要机制。     

基于X.509证书的授权管理中RBAC策略的研究

描述了基于角色的访问控制(RBAC)的策略以及基于策略的权限管理的系统框架,介绍了一个X.509权限管理模型及怎样来实现 RBAC,以及如何用XML设计网上交易系统权限管理的RBAC策略模型。     

网络流量监测服务器系统的研究

在电信企业的大型网络体系中,对网络数据流量的监测和控制已经为人们所关注。结合Flow Accounting Server(FAS)和Cabletron Traffic Accounting(CTA)管理系统,通过对LFAP协议的分析和研究,提出了对网络的流量和策略进行控制的方法,从而解决了大量的网络流 量监测任务。     

用分布式防火墙构建网络屏障

本文介绍了分布式防火墙的结构,工作原理和实现策略.分析了分布式防火墙对各类问题的解决机理.最后作者指出了分布式防火墙存在的一些问题.     

Sustainability assessment of dwellings – a comparison of methodologies

Building sustainability assessment tools (BSATs) aim to promote and rank the sustainability of building stock. This paper makes a deep comparative analysis on how dwellings are evaluated by five BSAT and one performance-based design tool. The comparison is based on: (i) the purpose of assessment; (ii) sustainability dimensions considered; (iii) indicators addressed; (iv) life cycle phases considered by the indicators; (v) type of indicators; (vi) measurements; (vii) aggregation processes; and (vii) life cycle phases during which the assessment was carried out. The evaluation showed that the scope of BSAT varies significantly as well as the life cycle phases addressed in the assessment. Financial issues are often excluded from the assessment. None of the schemes is totally quantitative or qualitative in their measurement system; all have different types of indicators and different ways to assess them. This research provides researchers and stakeholders with important inside knowledge on the tools that allow the development and construction of more sustainable buildings.     

Enterprise engineering and management at the crossroads

The article provides an overview of the challenges and the state of the art of the discipline of Enterprise Architecture (EA), with emphasis on the challenges and future development opportunities of the underlying Information System (IS), and its IT implementation, the Enterprise Information System (EIS). The first challenge is to overcome the narrowness of scope of present practice in IS and EA, and re-gain the coverage of the entire business on all levels of management, and a holistic and systemic coverage of the enterprise as an economic entity in its social and ecological environment. The second challenge is how to face the problems caused by complexity that limit the controllability and manageability of the enterprise as a system. The third challenge is connected with the complexity problem, and describes fundamental issues of sustainability and viability. Following from the third, the fourth challenge is to identify modes of survival for systems, and dynamic system architectures that evolve and are resilient to changes of the environment in which they live. The state of the art section provides pointers to possible radical changes to models, methodologies, theories and tools in EIS design and implementation, with the potential to solve these grand challenges.