弹性分组环缓存容量研究

弹性分组环（RPR）是当前城域网发展的重要方向，是为了满足基于分组的城域网的要求而设计的。为了实现基于优先级区分的业务服务质量，弹性分组环采用了基于优先级区分的队列以及转发机制。与传统的队列延时研究方法不同，弹性分组环中的业务接入以及转发延时与当前网络中的拥塞状况密切相关。本文基于弹性分组环协议，建立了弹性分组环转发缓存和接入缓存的排队模型，对弹性分组环中的业务接入时延以及转发队列时延做了定量的分析计算；进而得到弹性分组环中各类优先级转发及接入缓存所需要的容量；利用仿真工具建立了RPR网络的排队传输模型，并进行了仿真验证。仿真结果和理论分析的结果非常接近，从而验证了所建立排队模型的正确性，能够为网络业务配置提供有效的参考；各级缓存容量的结论已经应用在弹性分组环的专用芯片设计之中。     

地铁建设与城市规划一南京地铁1号线一期工程前期规划纪实

通过回顾南京地铁1号线一期工程的前期规划工作,阐明规划工作在地铁工程建设过程中所起的巨大作用,即:南京地铁1号线一期工程每千米综合造价能控制在4亿元以内,是和南京地铁抓好前期工作,尤其是和规划研究工作分不开的,规划研究工作是地铁工程前期工作的龙头,是降低地铁造价,保证地铁建设持续发展的重要环节;地铁与规划紧密相伴,规划工作贯彻地铁工程始终;规划工作能产生实际经济效益:规划是生产力。     

Remote Sensing for Coastal Area Management in China

Satellite remote sensing technique has been used to observe the coastal area. This article reviews applications of remote sensing to coastal area management (CAM) in China. These applications include the coastal resource and island mapping, coastal environmental change and coastal hazard monitoring, oceanographic parameter measurement, and coastal process restudy. Future applications are also discussed.     

基于部门协调的分布式决策支持系统

为了向组织结构分散化的企业提供有效的决策支持，运用协调决策理论，构建了部门间协调决策的一般性模型，并根据这一模型设计了基于部门协调的分布式决策支持系统的体系结构．在该模型中，将企业职能部门区分为主导部门和非主导部门，每个部门都有机会成为主导部门或非主导部门．此外，明确定义了协调决策过程信息交换的内容，即主导部门向非主导部门传递全局决策向量，而非主导部门向主导部门传递各自的边际收益向量．最后，描述了模型的求解过程——通过有限次部门模型求解和信息交换，最终得到决策问题满意的解答．     

Collecting a multi-dimensional three-weeks household time-use and activity diary in the Bandung Metropolitan Area,Indonesia

This paper describes a comprehensive panel data collection and analysis at household level, including detailed travel behaviour variables and comprehensive in-home and out-of-home activities, individual cognitive habits and affective behaviours, the rate of physical activity, as well as health related quality of life (QoL) information in the Bandung Metropolitan Area (BMA) of Indonesia. To our knowledge, this is the first attempt to collect an individual’s activity diary over an extended period as it captures the multi-tasking activities and multidisciplinary factors that underlie individual activity-travel patterns in a developing country. Preliminary analyses of the collected data indicate that different beliefs, anticipated emotions, support and attachment to motorised modes significantly correlate with different groups of occupation, gender, age, activity participation, multi-tasking activities, and physical health, but not with different social and mental health. This finding highlights the reason why implementing car reduction policies in Indonesia, without breaking or changing the individual’s habits and influencing his/her attitudes have not been fruitful. The results also show that endorsing more physical activities may result in a significant reduction in the individual’s motorised mode use, whilst individuals who demonstrate a tendency to use their spare time on social activities tend to have better social health conditions. Furthermore, undertaking multi-tasking out-of-home discretionary activities positively correlates with better physical health. All these highlight the importance of properly understanding and analysing the complex mechanisms that underlie these fundamental factors that shape individual daily activity-travel patterns in developing countries. This type of multidisciplinary approach is needed to design better transport policies that will not only promote better transport conditions, but also a healthier society with a better quality of life.     

A dispatching decision support system for countering delay propagation in intermodal logistics networks

This paper specifies a dispatching decision support system devoted to managing intermodal logistics operations while countering delay and delay propagation. When service disruptions occur within a logistics network where schedule coordination is employed, a dispatching control model determines through an optimization process whether each ready outbound vehicle should be dispatched immediately or held to wait for some late incoming vehicles. Decisions should consider potential missed-connection costs that may occur not only at the next transfer terminals but also at hubs located further downstream. Numerical examples and a sensitivity analysis with different slack time settings for attenuating delay propagation are presented.     

国际金融危机对广西-东盟物流业的影响及对策

文章基于对东盟的贸易结构、运输方式和广西-东盟的物流业发展现状的分析,以广西物流基础设施发展举措为重点,对国际金融危机下广西-东盟的物流业发展对策进行了探讨。     

并联高架路的交叉路口及道路网络

并联高架路是一种车辆在高架道路上逆向行驶,主要为城市公共交通服务的道路;并联高架路主要用于连接主城区外围的卫星城、大城市附近的大、中、小城市,可以形成带状及网状的城市圈。交叉路口是并联高架路形成完全互通交叉的路网及带状、网状城市圈的关键。并联高架路路网构成的城市公共交通系统交通成本低,可以使土地整理有明确的指向,从总体上节约土地,利于城镇化建设;有效抑制城市房价过高,防止城市房地产吞噬过多的社会财富。     

上海市沿江通道工程浦东段选线思路简介

上海市沿江通道工程对于构建浦东对外联系通道、优化公路集疏运体系、支撑国际航运中心建设有着积极的战略意义,是＂十二五＂期间上海市公路建设重点项目之一。沿江通道浦东段衔接了外高桥地区大量港区、保税区、物流堆场等重要设施,是实现通道整体功能的关键路段之一,而其沿线复杂的建设条件与敏感因素,又使之成为全线工程最大的难点之一。为...