基于遗传算法的集成逆向物流的供应链网络设计

对于一个固定拓扑结构的供应链,基于设施能力和顾客需求的约束,以正向物流与逆向物流的总成本最小为目标,构造供应链网络设计模型,采用基于优先权编码的遗传算法求解。按照遗传算法的原理,将供应链按物流活动过程划分成4个阶段,运用基于优先权的编码方法对各个阶段进行编码;为加速算法收敛,利用贪婪启发式算法确定初始种群,通过遗传操作产生后代,并定义交叉算子和变异算子。以某一区域供应链网络规划为例,运用给出的模型和算法对需要设置工厂、铁路货运中转站的数量、位置及功能进行计算,并与其他算法所用计算时间比较。结果表明,采用本算法能够得到区域供应链网络规划的最优解,且所用的计算时间最少。     

A methodology for classification by priority for action: Selecting road stretches for network noise action plans

Road traffic noise is an element of outstanding importance within the overall context of environmental impact. This problem must be technically addressed from an efficient viewpoint, and solutions or alternatives should be considered by means of appropriate and consolidated procedures.Up to now, there is no regulated guideline for establishing well-founded priorities when dealing with the diverse road stretches included in the corresponding Action Plans against noise under the Environmental Noise Directive (2002/49/EC). To this end, the present study proposes a methodology to sort, by priority, road stretches identified by their noise problems and therefore requiring appropriate action. The methodology is based on the so-called “road stretch priority index” (henceforth referred to as RSPI). This index involves a number of variables (called “road stretch priority variables”) that are weighted according to their influence on the road traffic noise problem. Thus, the RSPI makes it possible to prioritize different stretches of the Action Plan. To illustrate the application of the proposed methodology, this paper also describes a real case entailing a difficult choice, applying the proposed methodology to a review of the Action Plan against Noise 2008–2012 in the province of Almería, for the road network of the regional government of Andalusia, Spain.     

公路水毁抢修优先性排序

水毁抢修是水毁治理的重要一环,文章在借鉴国内外水毁研究成果的基础上,针对我国水毁频发而抢修资源不足的问题,分析了影响水毁抢修优先性的因素,并创造性的建立了抢修优先性排序方法,提出了量化水毁优先性的指标,对我国特别是西部地区的水毁防治工作具有重要意义。     

Mixed Least Square Method for Priority of Complementary Judgement Matrix and Its Algorithm

Introduction Multi-objective decision-making theories play animportant role in modern decision-making science,and have been widely applied to many decision-mak-ing fields, such as systemic optimization, economicevaluation, urban planning, etc. In order to…     

浅谈铁路综合视频监控系统的管理功能

综合视频监控系统可以有效提高铁路运输的安全性。介绍了综合视频监控系统平台中如何规划及建设整个平台的管理系统,针对管理系统应具有的功能和各级管理应具备的功能以及各级用户应具有的权限和优先级,提出了简单建议。     

北京市公共交通发展模式对长沙市的启示

本文通过对北京市“公益性”公共交通发展模式及其特点的借鉴,探讨了长沙市当前在公共交通民营化过程中存在公交票价标准不一、公交企业内部存在“寻租”等一系列问题,并得出了应从加大财政扶持力度、提高公共责任意识、充分发挥社会监督作用等方面来完善长沙市公共交通的启示。     

坚持公交优先，努力推动我国城市交通状况改善

本文重点分析了目前我国城市交通中存在的问题,并从法律法规、经济政策、完善基础设施建设、构建综合交通体系等几个方面提出相应的对策和建议,并指出必须以公交优先、大力发展大容量快速公交为导向,引导城市发展模式转变,促进我国城市交通的健康发展。     

治理理论下的公交优先发展策略研究

在社会治理背景下,优先发展公交是摆在人们面前的一项重大课题。借鉴治理和善治理论,实现公交优先发展,必须坚持和贯彻“政府主导、多方参与”的原则思路,形成良好的治理模式。政府主导即加强政府在公交发展中的主导地位,加快公交立法,并形成合理持续的资金支持机制;多方参与即形成包括规划、建设管理部门在内的共同互动的机制,为公交创造一个良好的发展环境。     

Joint optimization of tram timetables and signal timing adjustments at intersections

This paper explores at the planning level the benefits of coordinating tram movements and signal timings at controlled intersections. Although trams may have dedicated travel lanes, they mostly operate in a mixed traffic environment at intersections. To ensure tram progression, pre-set signal timings at intersections are adjusted by activating Transit Signal Priority (TSP) actions, which inevitably add delays to the auto traffic. A mixed integer program is proposed for jointly determining tram schedules for a single tram line and modifying signal timings at major controlled intersections. The objective is to minimize the weighted sum of the total tram travel time and TSP’s negative impacts on other traffic. A real-world case study of Line 5 of the Shenyang Hunnan Modern Tramway shows that by extending the dwell time or link travel time we can significantly reduce the TSP’s negative impacts on the auto traffic while only slightly increasing tram travel times.     

当代中国城市公交发展中的瓶颈问题及其突破

城市公共交通是城市社会生活和经济运行的大动脉。科学有效地管理城市公共交通,是时代赋予我们的一项重大任务。然而近年来随着中国城镇化的加剧,城市交通拥堵,城市道路交通安全事故频发,城市汽车数量大幅增加带来的环境污染及能源紧缺所形成的不协调、不和谐,越来越成为制约城市公交发展的瓶颈问题,,要突破这一瓶颈．只有在实际管理过程中严格落实“公交优先”的发展战略,通过各政府管理部门的统一管理,建设和发展以大容量公共交通为骨架的公交网络,同时加快相关立法,为管理过程提供法律依据．多管齐下,综合治理。