Aggregate and detailed production planning integrating procurement and distribution plans in a multi-site environment

A monolithic mixed integer linear goal programming (MILGP) model that is developed in this paper produces a time and capacity aggregated production plan, a detailed production plan, a detailed procurement plan and a detailed distribution plan simultaneously to overcome the drawbacks of the hierarchical/sequential planning approaches of not yielding a feasible and/or an optimal plan. The model uses different time-grids and planning horizons for aggregate and detailed planning to reduce the computational burden. The limitations of storage space, raw material availability and production capacity at plants and a requirement of maintaining a minimum level of inventory buffer or forward cover have been modelled. Two heuristics that are proposed to solve the MILGP model gave good quality solutions with an average and the worse case optimality gap of 1.17% and 4.4% respectively when applied to one hundred randomly generated industry size problem instances.     

面向网络化制造的竞价采购系统的研究

阐述了采购在网络化制造中的位置和作用,分析传统采购与反拍卖采购技术特点,在研究了国内外采购系统的研究现状的基础上,提出了开发基于RAT技术的竞价采购系统总体设计思想与方法,进行了关键技术和竞价流程的研究,并设计与实现了竞价采购系统原型。     

对医院洁净手术室工程管理的探讨

医院洁净手术室的建造是一个涉及医疗卫生、建筑装修、净化空调、信息通信、医用气体等多专业、多学科的系统工程,因此管理工作非常重要.由于管理工作欠缺和目前我国手术室建设的专业技术和市场状况会给手术室的建造质量带来不良后果.因此作为甲方医院本身必须要加强对手术室建造的管理,管理要从工程的前期工作开始,选择合格的设计单位和施工...     

基于Web的采购招标系统的分析与设计

基于Web的采购招标是采购招标模式发展的必然趋势。本文通过与传统采购招标的对比,分析了基于Web采购招标的优势。在此基础上,结合采购招标的实际流程,采用面向对象UML建模的系统分析方法,构建基于Web采购招标系统的模型视图。最后,对基于Web采购招标系统的数据安全进行设计,并从用户权限的角度给出用户组与系统功能的关系图。     

压力容器采购中催交检验工作的探讨

简要介绍了在石化工程项目建设中,催交和检验工作对采购工作和整个项目的重要作用。     

配套件采购管理系统

配套件采购管理系统是北方重工集团企业信息化建设的重要组成部分,本系统遵循北方重工集团的行业规范,针对采购部门的业务特点,面向采购流程内的业务人员,本着贴近实际的思想,为相关部门人员提供方便快捷的操作方式,实现整个采购流程的信息化、高效化。     

鹤煤物供基于ABC分类法的库存管理策略的研究与应用

随着人类社会发展的信息化、高科技化和全球化,物流已经成为当今社会经济活动的重要组成部分,而库存存在于物流及供应链中的各个环节,库存管理是物流及供应链管理的重要工作之一。如果说资金是世界运转的“润滑剂”,那么库存就是各个企业的“润滑剂”,库存管理与企业的发展息息相关。库存就像一把“双刃剑”,它是企业供需平衡的根本保障。详细分析了ABC分类法在企业库存管理中的应用,并提出ABC分类法存在的不足之处及改进意见。ABC库存管理通过信息技术创新业务流程,提高效率,实现库存体系的合理化,是当今国外在库存领域新的发展趋势。     

Close-optimal production and procurement policy for a X-network of added value using lexicographic linear goal programming

One of the main challenges of operation managers of firms is to setup feasible production and procurement plans. This is also the case of more complex structures such as supply chains. In almost all firms, specific tools like ERPs are used to support managers in their decision-making tasks. These tools manipulate huge amount of data such as the order backlog, or technical, marketing, suppliers and customers data. They work often based on the MRP principles and suggest production and procurement plans after a sequential procedure which begins by the material requirements calculation followed by the load balancing process. Very often, the load balancing is under the control of managers who try to take account of implicit constraints that cannot be modelled easily. This is a difficult and often risky task because the managers do not know what the best solution of the planning and procurement problem is. In other words, there is a lack of a kind of “the best feasible production and procurement target”. The main idea of this article is to suggest a complementary method for planning based on a specific mathematical programming approach which provides plans considering simultaneously all material and capacity constraints over the entire planning horizon. These plans can be considered as that necessary closed optimal production and procurement target for a company or a supply chain which uses an MRP-based planning tool. The lexicographic linear goal programming provides a suitable multi-criteria modelling paradigm for the production and procurement planning problems, especially for the supply chains. The study is focused on a common supply chain structure formed by several suppliers on one side and several customers on the other, connected together by a business-to-business relationship over a rolling horizon. The structure is modelled thanks to the Petri Nets supporting the definition of the global problem model. The model is then applied to a study case extracting from the car assembly industry.     

基于网络的公司采购系统设计

采购变得越来越重要,因为产品成本的2／3来自采购,电子化采购是一种降低成本的新的采购方式。阐述了基于Internet电子采购的信息系统原理,详细分析了采购流程,并建立了采购模型,同时,也讨论了如何实现Internet与Intranet的连接。     

Competitive Advantage In Construction: Comment

Two approaches are described which aid the selection of the most appropriate procurement arrangements for a building project. The first is a multi-attribute technique based on the National Economic Development Office procurement path decision chart. A small study is described in which the utility factors involved were weighted by averaging the scores of five ‘experts’ for three hypothetical building projects.

A concordance analysis is used to provide some evidence of any abnormal data sources. When applied to the study data, one of the experts was seen to be atypical.

The second approach is by means of discriminant analysis. This was found to provide reasonably consistent predictions through three discriminant functions. The analysis also showed the quality criteria to have no significant impact on the decision process.

Both approaches provided identical and intuitively correct answers in the study described. Some concluding remarks are made on the potential of discriminant analysis for future research and development in procurement selection techniques.