移动IPv6简介

本文简单介绍了移动IPv6技术的组成和基本工作原理，与移动IPv4技术比较说明了移动IPv6技术的优点，并结合3G核心网简述了移动IPv6在通信网的应用。     

移动IPv6简介

本文简单介绍了移动IPv6技术的组成和基本工作原理,与移动IPv4技术比较说明了移动IPv6技术的优点,并结合3G核心网简述了移动IPv6在通信网的应用.     

基于移动IPv6的移动性管理研究

本文研究了基于移动IPv6的移动管理机制,分析了快速移动IPv6和分级移动IPv6相关技术,最后还探讨了移动IPv6的安全机制,对于移动IPv6技术发展具有一定帮助。     

4G移动通信技术简析与发展预期

本文将3G和4G移动通信技术的应用和利弊进行分析，阐述4G移动通信系统中的关键技术，并对4G的发展方向进行预测。其中4G关键技术包括OFDM技术、智能天线技术、软件无线电技术、多用户检测技术、IPv6技术等。     

浅析4G移动通信系统

本文阐述了4G通信技术的概念和关键性能，对4G通信的几种关键技术进行了简要说明，如正交频分复用、软件无线电、多人多出无线技术、智能天线技术、多用户检测、IPv6技术等，本文又对4G技术优于3G技术的原因进行了解析，最后还预测了4G未来的发展趋势。     

论IPv4向IPv6过渡的必要性和可行性

文章阐述了IPv4的局限性和发展IPv6的必然性和可行性,同时就从IPv4过渡到IPv6的3种方式——双协议栈、隧道技术和翻译器技术进行了探讨,但目前的IPv6仅仅处于实验阶段,对IPv6的真正使用还有一段很长的时间,有许多细节问题需要解决。     

基于OPNET移动IPV6的技术研究

现分析了移动IPv6的工作原理的前提下,对TCP协议作了进一步改进,分析了TCP拥塞控制机制,并进行了相应的改进,提高移动IPV6的网络性能。研究了OPNET网络仿真工具,搭建实验平台。使用该平台对改进的方案进行了仿真,并分析了实验结果。     

PMIPv6的移动自组织网络邻居节点的快速发现机制研究

为有效改善车辆道路安全、降低交通拥塞,采用移动自组织网络使路网中的各车辆所采集的交通信息能与周边其他车辆共享,是智能交通系统中常用的技术方案。由于交通信息与车辆地理位置有高度的相关性,但目前网络中每个移动节点并没有地理位置资讯,在应用层中无法有效区分移动节点的地理位置。文章提出一种基于IPv6移动代理协议(Proxy Mobile IPv6,PMIPv6)邻居节点的快速发现机制,对每个移动节点在注册/切换后可以快速找寻到邻近的移动节点,并通过该机制的节点注册切换、注册切换所需网络延迟、以及Binding Cache更新所需成本进行性能分析,能有效解决移动自组织无线网络中移动节点快速识别邻居节点的问题。     

IPv6在我国应用与发展的探讨

IPv6作为下一代Internet的核心协议,在IPv4的基础上进行了较大的升级和改进。IPv6技术相对于IPv4技术最突出的优势是IPv6极大地扩大了地址空间,恢复了原来因地址受限而失去的端到端连接功能。本文从几个方面对Ipv6在我国目前的应用进行分析以及对发展进行展望。     

IPv6网络寻址

随着网络不断的普及,IPv4地址日趋枯竭,为了应对这一危机,相关国际组织制定并公布了下一代网络协议———IPv6。本文试对IPv6的协议内容(地址格式和报头等)进行较为详细地介绍,IPv4向IPv6过渡技术以及目前IPv6的应用状况进行较为具体地说明。以期使初学者对IPv6有具体的认识,并对在IPv6应用中遇到的问题,找到可以近似参照的解决方案。     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.