MPLS VPN技术的研究

多协议标记交换技术(MPLS)是一种新出现的技术,旨在解决当前互联网环境中使用IP分组转发技术的许多问题。论文就基于IP的VPN技术在流量工程方面存在的问题,提出了基于MPLS技术的解决方案,并给出了一种基于MPLS的VPN流量管理模型。     

Improving Concessionaire Selection Protocols in Public∕Private Partnered Infrastructure Projects

A critical contributor to the success of a public∕private partnered (PPP) infrastructure project is the selection of the right private-sector partner, the concessionaire, who would provide the best overall deal throughout the build-operate-transfer (BOT)[build∕operate∕transfer] development process. This paper proposes a core concessionaire selection protocol that incorporates public procurement principles, best-value selection approach, competitive selection process, and multicriteria tender evaluation. Key pointers for an improved concessionaire selection protocol are discussed and analyzed by drawing experience and learning lessons from worldwide PPP practices. These include improved project brief and tender documents, formulation of a best-value selection methodology, determination of suitable criteria and methods for prequalification and tender evaluation, capital structure (equity-to-debt ratio), financial models, and potential improvements in different stages of the concessionaire selection process. Relevant results of a questionnaire survey of international PPP expert opinions on an enhanced concessionaire selection protocol are also presented.     

VPN技术的研究与应用现状及发展趋势

文章探讨VPN技术的研究与应用现状及发展趋势。首先,对主流VPN技术内核或标准的发展现状与趋势进行了分析,并简单介绍了商品化VPN产品;其次,阐述了VPN市场现状和发展趋势,并对现有厂商的VPN解决方案作了比较;最后,提出了典型企业VPN系统的应用模式,并对下一代VPN技术的发展趋势进行了展望。     

一种应用于分布式网络的新型私有多信道UWB MAC协议设计

目前,单信道MAC协议在网络负载较重时的冲突和退避,造成信道带宽浪费而使得协议效率不高.本文主要针对UWB应用在无线个域网络中的特定场景,提出了一种新的应用于分布式网络的私有多信道UWB MAC协议,既可以解决隐藏终端和暴露终端问题,又可以有效地分配信道资源,提高网络性能.     

防火墙在企业网络中的应用

在Internet应用迅速普及发展的今天,企业计算机网络接入Internet获取资源,提供信息是广泛的应用模式。此时,如何保护企业计算机网络资源不受外部非法侵袭是一个严肃、重要的课题。本文列举×××企业计算机网络系统的Internet访问安全核心Cisco公司的PIX　525防火墙,介绍如何利用防火墙提供的安全策略,构筑一般企业计算机网络Internet应用的安全。     

设计与完成--青浦私营企业协会办公楼设计

文章通过介绍上海青浦私营企业协会办公楼的设计,强调了对于设计完成度及其过程的关注。     

Low-income Tenants in the Private Rental Housing Market

The private rented sector (PRS) in England has often been described as having a ‘residual’ role in accommodating low-income households who are unable to gain access to social housing. This paper examines the accuracy of this residual role thesis. It does so using secondary analysis of the 2007 English House Condition Survey. The paper shows that the PRS plays a disproportionately important role in accommodating households living in poverty. It also shows that the odds of being income poor are the same for private tenants as for social housing tenants and three times higher than for owner-occupiers. It is concluded that, as a source of accommodation for low-income households, the role of the private rented sector is not residual at all. In addition, the paper assesses how well accommodated low-income households are in the PRS compared with non-poor private tenants and with low-income households in social housing and owner-occupation.     

医疗广告规范化背景下上海民营医院医疗市场拓展前景的思考

国家工商行政管理总局和卫生部公布的自2007年1月1口起施行的<医疗广告管理办法>标志着我国进入了医疗广告规范化的大背景时期.作为国内各项医疗政策监管较为严格的上海市民营医疗领域,沉淀了国内大量民营医院投资资本的上海民营医疗市场,近400家的民营医院实体,如何就市场拓展的前景进行探讨与思考,这是摆在上海民营医院经营者面前的重大课题.     

Critical parameters influencing value for money variations in PFI projects in the healthcare and transport sectors

Achieving good value for money (VFM) is the principal objective of any private finance initiative (PFI) project while sustaining it throughout the contract life is the greatest challenge. Empirical evidence is required to understand uncertainties surrounding VFM of PFI before finding effective ways to improve it. Variations in costs, time and client requirements are explored, between successive review stages of PFI projects from the strategic business case stage through to the operational phase. The magnitudes of these variations are established and critical parameters that influence them are identified. The research methods include a documentary analysis of the full business cases of five PFI projects and a questionnaire survey of 44 PFI projects from the healthcare and transport sectors in the UK. The findings reveal that the current VFM assessment of PFI projects is often carried out under conditions of considerable uncertainty with frequent changes in costs, timescales and client requirements. The list of critical parameters can help practitioners to identify priority areas and achieve a long-lasting VFM. The study broadens the understanding of whole life aspects of VFM of PFI projects and the interactivity of project parameters at different stages.     

Non‐destructive investigation

So‐called ‘dynamic'or ‘counterflow'insulation systems have already been installed in buildings in France and Sweden for which significant improvements over ‘classic’ insulation methods have been reported. Here, the authors describe a French study, including full‐scale laboratory tests, into the actual efficiency of a ‘permeodynamic’ version. A theoretical model has been developed from which to derive thermal efficiency values, and is compared with the test results. The limits of such dynamic systems, and their most feasible applications, are then discussed. The main conclusion is that conventional insulation techniques remain competitive for houses, but permeodynamic systems offer greater possibilities for industrial buildings.