Robust production planning and control for multi-stage systems with flexible final assembly lines

Production planning of final assembly systems is a challenging task, as the often fluctuating order volumes require flexible solutions. Besides, the calculated plans need to be robust against the process-level disturbances and stochastic nature of some parameters like manual processing times or machine availability. In the paper, a simulation-based optimisation method is proposed that utilises lower level shop floor data to calculate robust production plans for final assembly lines of a flexible, multi-stage production system. In order to minimise the idle times when executing the plans, the capacity control that specifies the proper operator–task assignments is also determined. The analysed multi-stage system is operated with a pull strategy, which means that the production at the final assembly lines generates demands for the preceding stages providing the assembled components. In order to guarantee the feasibility of the plans calculated for the final assembly lines, a decomposition approach is proposed to optimise the production plan of preceding stages. By this way, the robust production can be ensured resulting in reduced losses and overall production costs even though the system is exposed to changes and disturbances.     

基于城市设计中商务花园（Business Park）的可持续设计研究

如何改善商务区的可持续发展是一个重要的课题。本文着重研究了商务园区的设计方法以及一个可持续的商务园区的特征。通过介绍悉尼和英国的两个商务花园案例，分析了商务花园的可持续设计。     

濉溪县中小河流治理存在的问题与对策

文章分析了濉溪县中小河流治理存在问题及规划的必要性和紧迫性，提出了治理对策。     

关于加强城乡规划设计的有效途径分析

笔者根据多年工作经验，首先对城乡规划设计现状及存在的问题进行了分析，然后对加强城乡规划设计的有效途径控制进行了简要阐述。     

An integrated supply chain production–distribution planning with stochastic demands

In this paper a three echelon supply chain with multiple distribution centers, production sites and suppliers is modeled. For this supply chain several commodities with defined items is produced. The model is categorized as a capacitated facility location model. The hierarchical approach is used to modeling and based on decision types the model is divided into two levels. The solution approach is based on the Lagrangian Relaxation approach, improved by an efficient heuristic to solve complex sub-problems. Computational results indicated that the proposed method yields high-quality solutions within a reasonable computational time for various real size problems.     

Finding Order in a Chaotic World

Abstract

The World Wide Web (WWW) has a decentralized information environment and a non-linear (hypertext) information structure. This non-linear structure allows users to retrieve information at many different levels but also increases the difficulty of information retrieval. Unlike a well-developed CD-ROM database, the WWW does not have a controlled searching environment and information can be indexed in many different ways. It takes a well planned search strategy to perform an effective search in the labyrinth of the WWW. The SIRO (Systematic Information Retrieval/Organization) model offers a research planning process designed specifically for information seekers in the agricultural disciplines. The intention is to enhance search results and organize retrieved information. This process starts with the identification of the information structure on the WWW, then proceeds by organizing and analyzing information in a visual diagram or a “thinking map.” This process leads searchers to logical sources on the WWW and a systematic analysis of the result.     

数字地球三维影像在工程规划设计中的应用

通过对数字地球信息技术和相关软件的分析,论述了数字地球三维影像地形用于工程规划设计前期的可行性和与传统方法比较具有的优势,并且结合实例说明了数字地球三维影像地形在水利和公路工程中的应用技术。     

白云新城北部延伸区工程地质分区及评价

以白云新城北部延伸区工程地质勘察与地质环境质量评价为例,在综合分析规划区工程地质条件的基础上,对规划区工程地质分区的影响因素进行了探讨,并对规划区进行了工程地质分区及评价,为工程建设提供了依据。     

中原经济区郑州都市区建设战略研究

旨在通过对郑州都市区发展战略的研究,对接和落实中原经济区的战略构想,进一步促进郑州都市区更好更快发展,增强郑州都市区的核心凝聚力、竞争力和影响力,把郑州都市区建设成为中原经济区核心增长区和全国重要的区域性中心城市。     

基于市场需求背景下的城市文化规划研究—以本溪青云山公园规划策划为例

改革开放后30年,我国经济逐渐由计划经济转变为市场经济模式,随之而来的是规划编制工作的变革。针对文化迷失的现象,本文基于供求关系模型,以本溪市青云山公园规划策划为研究对象,采用定性分析与量化规划分析相结合的研究方法,对市场需求背景下城市文化规划内容和框架进行初步探讨。对应市场—空间规划策划的四步骤:文化需求、文化供给、市场落实和空间落实。以市场供求模型为基础,总结出以品质要求为导向满足消费者预期、以可持续供给为导向整合提升地域文化资源、以统筹区域文化资源为导向差异化市场落实、以提升空间品质为导向布局功能结构的规划策划研究。