大型排水泵房基坑优化设计研究

目前大量排水工程的地下泵房采用基坑支护的方式施工。大型排水泵房的结构具有地下各层的层高比较高、内隔墙布置复杂等特点。因此，基坑支护工程的设计和施工存在内支撑布置和换撑困难的问题。以某大型排水泵房的基坑优化设计为例探讨了一种利用给排水地下构筑物的结构特征布置换撑的方法，减小基坑支护工程中的换撑难度，加快施工进度。     

Mathematical properties and constraints representation for bottom-up approaches to the evaluation of GHG mitigation policies

Bottom-up models, including MARKAL, MESSAGE and AIM, are widely used when analyzing the effect of greenhouse gas (GHG) abatement policies. These bottom-up models are mostly formulated as a linear programming (LP) optimization model to find both the minimal cost combination of abatement technologies and energy flows while satisfying demands. It is not unusual that the bottom-up modeling involves a great number of technical, industrial, socioeconomic and environmental constraints. Investigating representative constraints needed for analyzing GHG abatement policies, this study proposes how to implement these constraints in bottom-up modeling.     

Real-time automatic rescheduling strategy for an urban rail line by integrating the information of fault handling

In the operation of urban rails, faults are inevitable, which leads to deviation between the actual timetable and the planned timetable. In nowadays, timetable rescheduling strategies rarely integrate the information of fault handling. In this paper, we develop a real-time automatic rescheduling strategy, which integrates the dynamic information of fault handling. The rescheduled timetable is obtained by a mathematical optimization model, the constraints set of which is automatically generated and adjusted as more information of fault handling is feedback. Compared with the experience-based rescheduling methods, the automatic rescheduling strategy reacts more quickly, and uses the information of fault handling more efficiently. A simulation system for testing the automatic rescheduling strategy is built, which uses the data of the Beijing Yizhuang metro line. Via testing on the simulation system, the effectiveness and efficiency of the automatic rescheduling strategy are validated.     

A mathematical programming technique for matching time-stamped records in logistics and transportation systems

Time-stamped data for transportation and logistics are essential for estimating times on transportation legs and times between successive stages in logistic processes. Often these data are subject to recording errors and omissions. Matches must then be inferred from the time stamps alone because identifying keys are unavailable, suppressed to preserve confidentiality, or ambiguous because of missing observations. We present an integer programming (IP) model developed for matching successive events in such situations and illustrate its application in three problem settings involving (a) airline operations at an airport, (b) taxi service between an airport and a train station, and (c) taxi services from an airport. With data from the third setting (where a matching key was available), we illustrate the robustness of estimates for median and mean times between events under different random rates for “failure to record”, different screening criteria for outliers, and different target times used in the IP objective. The IP model proves to be a tractable and informative tool for data matching and data cleaning, with a wide range of potential applications.     

连锁零售业库存／配送一体化决策优化模型与算法

针对在一个区域内拥有一个配送中心和n个在地理位置上分散的连锁分店的连锁零售业．建立VMI思想下适合于A类商品和一些重要的B类和C类商品的单一商品确定型需求的库存／配送一体化优化模型，并采用逐步迭代的方法对模型进行求解，可得出使系统在一定时期总成本最小的经济订购批量，最后用一个算例使连锁零售业库存，配送一体化决策在物流成本节约方面的优越性得以验证。     

重载铁路调度优化系统内部通信关键问题及算法研究

为研究重载铁路调度优化系统内部通信的关键问题,对调度优化系统内部通信结构和特点进行分析,得出影响通信的关键问题,通过对这些问题进行分析和建模,建立UDP和TCP相结合的总线式通信机制,从而保证系统内部通信的可靠性,满足调度优化系统内部通信的要求。     

物流网络优化中路径问题的研究

在深入分析物流系统化和网络化的基础上,对物流网络优化中物流路径问题进行研究,通过分析物流结构模型和数学模型,提出了最短路径和关键路径物流策略的分析方法,给出了具体的计算方法,并举实例加以说明,为解决现代物流结构中存在的系统设计和运作等问题提供了理论依据和技术方法。     

基于文化粒子群网络优化算法的医学图像研究

文章提出了基于文化粒子群的网络优化算法的医学图像方法，通过在50例唇裂矫正术中运用BP神经网络进行学习．对唇部进行解剖观察和美学分析，在矫正修复手术中不断学习和调整来接近期望输出，并通过实验仿真及客观的图像提出了评估准则。实验结果表明，在美学研究基础上的基于文化粒子群BP神经网络的医学图像研究，适用于唇裂的矫正修复。     

PARNASSOS与肥大型船的尾部水动力优化

以某肥大型船为研究对象，系列变化其尾部线型，然后利用荷兰MARIN水池开发的粘流计算软件PARNASSOS计算尾部流场，分析粘性阻力和伴流场随线型的变化规律，总结了肥大型船尾部优化时要注意的问题。