Throughput-based fair bandwidth allocation in OBS networks

Fair bandwidth allocation (FBA) has been studied in optical burst switching (OBS) networks, with the main idea being to map the max-min fairness in traditional IP networks to the fair-loss probability in OBS networks. This approach has proven to be fair in terms of the bandwidth allocation for differential connections, but the use of the ErlangB formula to calculate the theoretical loss probability has made this approach applicable only to Poisson flows. Furthermore, it is necessary to have a reasonable fairness measure to evaluate FBA models. This article proposes an approach involving throughput-based-FBA, called TFBA, and recommends a new fairness measure that is based on the ratio of the actual throughput to the allocated bandwidth. An analytical model for the performance of the output link with TFBA is also proposed.     

相聚汉诺威——IKK 2001国际制冷空调通风贸易博览会纵览

以精选自众多参展商的具有代表性的展品，展示了世界制冷空调通风行业的发展趋势。     

规范招标工作程序,坚持诚信执业——公园路工程招标实践与思考

上海国际汽车城公园路工程采用公开招标方式选择承包商。文章以公园路工程招标的实践,介绍了市政工程项目的招标程序,招标工作必须规范工作程序、依法招标,必须严格保密、接受政府和社会的监督,真正体现“公开公平、公正”的原则。     

从城市文化发展的角度,用城市设计的手段看历史文化地段的保护与发展——以北京白塔寺街区的整治与改建为例

该文从城市文化发展的角度，论述传统文化在北京市的地位和作用，同时对白塔寺街区的历史与现状进行研究，运用城市设计的观点和方法，提出白塔寺街区发展的基本思路，并进一步对历史文化地段的保护与发展提出看法。     

基于改进加权公平队列的变电站局域网通信队列调度策略

智能变电站通信网络中以太网技术的发展为智能变电站的数据共享提供了更为有效的途径。局域网通信队列调度策略作为其中的关键一环,其重要性也日益凸显。针对智能变电站中现有的优先级调度策略所存在的不足,对传统的加权公平队列(WFQ)算法进行了适当的改进,并在此基础上提出了一种适用于智能变电站的局域网通信队列调度方法。以典型的智能变电站为例,通过OPNET软件建立了通信网络模型,并对所提的调度策略进行了仿真。仿真结果表明,在紧急情况下,所提的智能变电站综合局域网通信队列调度策略可在保证高优先级队列服务质量的同时改善低优先级队列的延时特性。     

基于MCFM模型的集贸市场火灾致灾因素分析

为降低大型集贸市场的火灾风险,探究大型集贸市场火灾致灾因素,运用解释结构模型分析各因素间的内在联系。结合交叉影响分析法和马尔可夫链预测构建定量分析模型,获得火灾致灾因素的稳态概率矩阵。研究结果表明：马尔可夫修正概率更加准确,该模型可明确大型集贸市场火灾致灾因素排查和管控的重点。     

部署QoS提高城域网承载多种业务的能力

本文结合青岛城域网的特点,讨论了部署QoS的相关问题,为下一步在城域网中承载多种业务提供了切合实际的参考。     

Do Source of Income Anti-discrimination Laws Facilitate Access to Less Disadvantaged Neighborhoods?

Vouchers have come to be seen as a tool for promoting economic and racial/ethnic integration. Discrimination based on Source of Income (SOI), however, could hinder the use of vouchers to move to more desirable neighborhoods. State and local SOI anti-discrimination laws (SOI laws) are one policy response to address this issue. SOI laws make it illegal for landlords to discriminate against voucher recipients solely on the basis of their having a voucher. The research presented here tested whether SOI laws in the USA improve locational outcomes for voucher recipients. This research found that the impacts of SOI laws on locational outcomes are mixed. We found substantively important reductions in neighborhood poverty rates associated with the implementation of SOI laws and small but statistically significant reductions in minority concentration as well. The concentration of voucher recipients in a neighborhood, however, does not appear to be related to SOI law implementation.