Siting a facility in continuous space to maximize coverage of a region

Siting facilities in continuous space such that continuously distributed demand within a region is optimally served is a challenging location problem. This problem is further complicated by the non-convexity of regions typically encountered in practice. In this paper a model for maximizing the service coverage of continuously distributed demand through the location of a single service facility in continuous space is proposed. To address this problem, theoretical conditions are established and associated methods are proposed for optimally siting a service facility in a region (convex or non-convex) with uniformly distributed demand. Through the use of geographic information systems (GIS), the developed approach is applied to identify facility sites that maximize regional coverage provided limitations on facility service ability.     

基于优化模糊神经网络控制的加热炉应用

针对加热炉具有大惯性和纯滞后性,提出优化模糊神经网络控制。该控制将模糊逻辑推理与神经网络控制技术融合,同时利用遗传算法优化隶属度函数,采用误差反向传播学习算法在线调节神经网络权值,提高了控制器的稳定性、鲁棒性和适应性。仿真结果证实了控制器的有效性。     

小交通量路网改造资金优化投资模型的研究

传统的以经济效益为目标函数的优化模型在一定程度上影响了路网改造项目决策的合理性.针对我国西部地区经济落后、交通量小、客货在途时间价值低的特性,采用以道路服务水平提高值作为目标函数,资金投入作为约束条件的优化模型,对西部路网改造资金进行了优化分配.该模型在湖北省恩施地区的路网改造资金优化中取得良好效果.     

快速分层移动组播的路径优化研究

随着科学技术的飞速发展,多媒体通信的需求导致了组播技术的快速进步。如何节约网络资源,为移动设备提供更好的支持也引起了人们的普遍关注。由于组播具有可扩展性强、高效的特点,因此移动组播的应用已经得到了越来越多的关注。本文根据快速分层移动组播现有算法中的传输路径问题,介绍一种新的路由路径选择方法。该算法依据移动节点在新接入点停留的时间长短,选择不同的数据传输路径加入组播。可以优化组播分组的传输路径,有效减少网络资源的浪费。     

乙烯裂解原料发展趋势及优化建议

本文分析了世界乙烯裂解原料构成现状和未来发展趋势,指出了国内乙烯裂解原料的构成特点及存在的问题,对乙烯裂解原料的优化提出了相应建议.     

煤矿技术创新管理研究

文章主要对煤矿技术创新的重要性,以及煤矿技术创新中遇到的问题和优化对策等3个方面进行了分析。     

浅谈矿山优化采准设计

文章在分析矿山采准工程设计现状的基础上,运用工程经济分析的基本理论,提出了优化采准工程设计的方法和步骤。     

Linux环境中Web服务器的配置与优化

文章详细讲解了在Linux操作系统中如何配置和优化Web服务器,希望为后续的技术应用奠定坚实基础。     

Multi-period layout planning for hospital wards

Layout planning for hospitals is a long-term decision. Nevertheless, medical and organizational factors change over time. For example, demand for different-sized bed rooms varies based on medical requirements and patient preferences. In this paper, we consider the planning of ward layouts over multiple periods using different approaches. The fixed ward layout models aim at minimizing either the number of demand violations or costs for installing fixed patient rooms. In contrast, the variable ward layout model allows for layout adaptations to satisfy demand. Thus, additional costs for the movement of walls have to be considered. The application of the different approaches as a decision support tool for hospital planners is explained. Hence, it can be derived in which settings the costs for adapting a layout do not exceed the benefits of such a change. Computational experiments demonstrate the applicability of the models for realistic instances.     

转型时期中国产业结构优化的现实困境与出路研究

运用产业结构调整和经济发展方式转变的基本理论,从国内与国外经济数据对比的角度分析我国产业结构优化中面临的现实困境。制度因素和技术因素是影响产业结构优化的关键因素,认为只有深化制度革新、推动技术进步与调整三次产业结构方能从根本上解决产业结构优化的实现问题。