武汉市高校间公交线路的最优化设计

对武汉市高校间公交线路进行了设计.首先根据互访人数对25所代表性高校间的距离进行修正,采用聚类分析模型将25所高校划分为3类,分别以到达目的地所经过路程和线路总长度作为学生和公交公司的满意度指标,在每一类别内建立基于学生和公交公司满意度最大化的多目标优化模型,采用线性加权法将其转化为单目标优化模型并采用模拟退火算法进行模型求解.结果表明设计的3条公交线路长度适宜,学生到达目的地所经过路程结果较为合理.     

The Design of Storage Calorifiers: A Case Study

To date, no scientific method for the sizing of storage calorifiers has existed. This short paper outlines the analytical methods which were established to provide design criteria for the storage calorifiers serving hospital ward units. A full report of the survey which was carried out is contained in a paper entitled “A study of water consumption in ward units”.     

航空公司航线决策的一种系统方法

本通过对航空公司基于现有运力选择航线这一决策问题的诸多影响因素的综合分析,根据经验和灵敏度分析的结果,提炼出适于决策的关键因素作为这个多目标决策问题的目标属性,给出了确定各属性值和其权的相应技术和方法,并运用适宜本问题的决策分析方法,完成决策过程,这是作提出的一种较为系统的航线决策概念和方法,也是一种可程序化的方法,借助于计算机并建立相应的数据库,能快速,方便地完成这一决策分析,对如何选择最佳的航线网络,也可类此采用本方法。     

A Routing and Scheduling Problem for a Rail System: A Case Study

Railways are extensively used in the Australian sugar industry to transport cane from farms to the factories. Development of efficient schedules manually is difficult, given a weak set of constraints and the need to consider operating and capital costs and the deterioration of cane in the period between harvesting and processing. The Cane Railway Scheduling Problem deals with the design of a regular schedule. The algorithm devised is based on a serial decomposition (with routing and scheduling considered separately) to generate a trial solution, modification of the trial solution to provide a first feasible solution and iterative refinement to provide the final solution. Comparison of solutions produced by the algorithm and those generated manually suggests potential savings ranging from 20% to 30% in annual operating costs with accompanying reductions in rolling stock requirements. Use of the model in the industry is noted.     

A Marketing Model for a Price-Promoted Consumer Good: A Case Study

The paper describes a simple competitive marketing model based on regression analysis of historical data. It outlines the analysis stages, and then describes the practical implementation of the results. One section considers the way results from the model were analysed to indicate the best competitive strategy.     

Developing a Methodology for Multidisciplinary Action Research: A Case Study

This paper describes an approach taken to carrying out multidisciplinary action research into contract management within the National Health Service. The work forms part of the ‘Contracts and Competition Programme’ funded by the Economic and Social Research Council. The members of the team had little experience of multidisciplinary research prior to the start of the study and little guidance in this regard is provided in the management science literature. Hence, there was a clearly identified need to develop an approach capable of guiding the work and ensuring that the wide range of disciplinary perspectives within the team could be successfully incorporated into an integrated whole. The approach taken makes use of concepts from soft systems methodology to provide an overarching framework for this purpose and this paper reports on its successes and failures.     

农业社会化服务与农业生产效率的灰色关联度分析——以新疆为例

主要研究了1994 2018年新疆农业社会化服务水平和农业生产效率之间的关系.首先运用熵值法对此期间农业社会化服务水平进行测度,其次采用数据包络分析法(DEA)对农业生产效率进行测度,最后运用灰色关联度分析模型测度农业社会化服务体系中各分项服务与农业生产效率之间关联度.结果表明新疆农业社会化服务整体水平显著提升;新疆农...     

The Adult Training Centre Problem: A Case Study

An optimal solution is found to a real-world problem which has the characteristics of a multiple travelling-salesman problem. It deals specifically with methods of obtaining the 'best' routeing for four vehicles which provide a daily service from a depot to 38 locations. The solution technique uses both heuristic and exact algorithms to derive the order for visits to the 38 locations.     

The Effectiveness of Communication at Meetings: A Case Study

Meetings occupy over 30 per cent of the time of an executive and existing training in meeting behaviour was not considered to be effective. Methods used to analyse communication at meetings are described. A group of observers has been trained to assist chairmen in improving the usefulness of their meetings. Reductions of 20 per cent in the number of meetings and of 30 per cent in their duration have been achieved. Standard practices for meetings have been established. Training should be given to coherent groups in the organization rather than to individuals if changes in behaviour patterns are desired.     

An Inventory Policy for Slow and Fast Movers in a Petrochemical Plant: A Case Study

The present paper deals with a real life case study which was carried out in a large petrochemical company. A central storehouse contains spare parts, articles of consumption and equipment. The continuous increase of inventory and the substantial depreciation due to deterioration required the existing inventory procedure to be evaluated. An ABC-analysis was carried out and appropriate models for different classes of items were developed. After evaluation of these procedures in an inventory simulator, the proposed methods were introduced in practice.     

Capacitated Lot Sizing for Injection Moulding: A Case Study

This paper considers the medium-term production smoothing problem for the injection moulding department of a Belgian firm. The problem is formulated as a series of one machine capacitated dynamic lot sizing problems, which are then solved by heuristic procedures. Computational results for real-life data are presented. It follows that the capacitated lot sizing approach succeeds in smoothing production such that subcontracting, which was often necessary with the E.O.Q. approach used by the firm, could be avoided in the future. Moreover, total set-up and inventory costs are reduced by about 20%.     

Symbolic Computation for Rankin-Cohen Differential Algebras: A Case Study

Don Zagier defined a “Rankin-Cohen algebra”, motivated by the study of differential operators that send modular forms to modular forms. We devised an algorithm that computes the result of the differentiation given by the modular forms that correspond to higher-order Wronskians over Klein’s quartic curve, which are modular forms of arbitrarily high degree canonically attached to the curve; this tool is potentially useful for finding commutative rings of differential operators.     

The Inhomogeneous Fermi-Pasta-Ulam Chain,a Case Study of the $$ Resonance

In this paper, we study the compressible Euler-Korteweg equations with free boundary condition in vacuum. Under physically assumptions of positive density and pressure, we introduce some physically quantities to show that the spreading diameter of regions grows linearly in time. This is an interesting result as one would expect that the capillary forces would prevent the boundary from spreading. Moreover, we construct a spherically symmetric global solution to support our theorem, followed by Sideris (J. Differ. Equ. 257:1–14, 2014).     

教育和健康对区域经济收敛的影响研究——以浙江省为例

本文基于扩展的Solow模型框架,研究了教育和健康人力资本对区域经济收敛性的影响。计量结果表明浙江区域经济在1997-2005年具有显著的条件收敛和俱乐部收敛特征,教育和健康人力资本均有利于经济收敛,且是影响区域经济收敛的一个显著要素。由于以往的研究多以教育来代理人力资本指标,本文分析表明健康对经济增长具有直接影响效应,因此人力资本指标如果仅以教育指标来代理计量,将会低估人力资本对经济增长的贡献力。     

The Case for Open Admissions: A Status Report

Accountability figures prominently in the higher education policy discourse these days. Critics of higher education (for instance, members of the Spellings Commission) argue that colleges and universities need to be more “transparent” to justify support by taxpayers, payers of tuition, and other funders. To better inform prospective students and other stakeholders, we are being asked to go public about our programs, educational processes, and results.