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一种移动IP的外部代理分层模型——Step-HMIP 被引量:1
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作者 伍卫国 张晓亮 +1 位作者 钱德沛 董小社 《计算机学报》 EI CSCD 北大核心 2004年第11期1514-1522,共9页
现有的移动IP规范存在两个重要的性能问题 :(1)通信对端和外地链路上的移动节点之间的三角路由问题 ;(2 )移动节点在紧密耦合的小蜂窝基站间频繁切换时会增加网络负载并加重数据包的丢失 .该文针对这两个问题进行研究 ,给出了一个基于... 现有的移动IP规范存在两个重要的性能问题 :(1)通信对端和外地链路上的移动节点之间的三角路由问题 ;(2 )移动节点在紧密耦合的小蜂窝基站间频繁切换时会增加网络负载并加重数据包的丢失 .该文针对这两个问题进行研究 ,给出了一个基于基本移动IP规范的外部代理分层模型———Step HMIP模型 .在此模型中引入了一个新的实体———网关移动代理 ,用以实现优化路由和平滑切换的功能 ;在NS上建立了Step HMIP的仿真模型 ,对模型的主要参数测试结果表明 ,Step HMIP模型在对属地代理 (HA)、固定的通信对端 (如Web服务器和FTP服务器 )和对网络层以上协议无需进行改动的情况下 ,以小的配置代价就可显著优化路由 ,降低属地代理的注册负载和稳定了切换时的数据传输率 . 展开更多
关键词 移动IP 网关移动代理 优化路由 软切换 分层 外部代理模型
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Beyond Transformational Change: Incremental Transformational Change in Institutions
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作者 George Comodromos 《Journal of Modern Accounting and Auditing》 2011年第4期424-430,共7页
Much has been written and researched about transformational change and the exogenous events that result in radical institutional transformation (Di Maggio & Powell, 1983; Hannan& Freeman, 1989; Fligstein, 1996; Zor... Much has been written and researched about transformational change and the exogenous events that result in radical institutional transformation (Di Maggio & Powell, 1983; Hannan& Freeman, 1989; Fligstein, 1996; Zorn, Dobbin, & Kwok, 2006). Accounts are provided of external agents disturbing the existing stasis of the institution and transforming the institution into something else that reflect a new paradigm or set of interests. Often, what is neglected in these accounts is what fractures exist in the original institution that would make them vulnerable and allow penetration by exogenous influences. Mahoney and Thelen (20 l 0) went beyond a general model of change that described the collapse of one set of institutional norms to be replaced by another. The model of change they propose takes into account both exogenous as well as endogenous factors as being the source of institutional change. They went on to state a view that transformation change as being a result of abrupt, wholesale breakdown needs to be rethought to include incremental, endogenous shifts in thinking that can often result in fundamental transformations. 展开更多
关键词 transformational change change management incremental change in institutions institutional change
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