Computer-Integrated Design and Manufacture of Integrated Circuits

Contains research goals and objectives, reports on sixteen research projects and a list of publications.Defense Advanced Research Projects Agency/U.S. Navy Contract N00174-93-K-0035Defense Advanced Research Projects Agency/U.S. Army Contract DABT 63-95-C-0088Multisponsored Projects Industrial/MIT Leaders for Manufacturing Progra

The impact of production mix variations and models varieties on the parts-feeding policy selection in a JIT assembly system

One of the significant challenges in operating a mix-model assembly system is the feeding of parts to the productive units. In order to avoid production loss, assembly systems require uninterrupted availability of components to feed workstations. On the other hand, the feeding of assembly components has to be performed in a way that minimises the related costs. In the past, the feeding system most widely used was so-called 'line storage' in which the components were stored along the assembly stations in large quantities and were periodically refilled by the central warehouse. Following just-in-time principles, nowadays, assembly system feeding is undertaken by supermarkets, as in decentralised storage areas close to the assembly lines. From such kinds of warehousing, a growing number of manufacturers are adopting two other feeding strategies: the kanban system, which continuously refills the assembly stations through the pull kanban system, or the kitting system, in which kits of components are prepared and delivered following the product through the assembly stations. This paper aims to quantitatively analyse and compare these two recent feeding strategies, considering the production mix variation and the assembled models variety influence. Moreover, kanban-kitting feeding policy and the related optimization issues are considered as hybrid. The findings from an industrial case study and a simulation analysis are also reported. Finally, a decision-making tool that defines a series of 'convenience areas' for the different feeding policies is provide

Computer-Integrated Fabrication System Structure

Contains an introduction, reports on thirteen research projects and a list of publications.Advanced Research Projects AgencyU.S. Navy Contract N00174-93-K-003

Sistemas de coordenação de ordens: revisão, classificação, funcionamento e aplicabilidade Systems for coordinating orders: review, classification, operationality and applicability

O foco deste trabalho são os ordering systems, os quais são sistemas de informação que programam ou organizam as necessidades em termos de componentes e materiais e/ou controlam a emissão/liberação das ordens de produção e compra, podendo conter ou não regras de seqüenciamento das ordens. Dentro deste contexto, o presente artigo tem por objetivos: apresentar uma nova nomenclatura para os ordering systems, sistemas de coordenação de ordens de produção e compra (SCO); apresentar uma tipologia que permita classificar os diversos sistemas de forma racional; destacar alguns sistemas altamente promissores em termos de aplicação e que são relativamente desconhecidos no Brasil e, trazer à tona um tema importantíssimo dentro do planejamento e controle da produção (PCP) e que está um tanto esquecido na literatura científica nacional.<br>Ordering systems are the focus of this work. Ordering systems are information systems which schedule or organize requirements in terms of components and materials and/or control the production and purchase orders emission/release being able to restrain or not rules of sequencing orders. Within this context, this paper intends: to present a new nomenclature for ordering systems, Systems for Coordinating purchase and production Orders (SCO); to present a typology that is able to classify all the systems in a rational way; to discuss some systems which have high potential for success applications and that are relatively unknown in Brazil and, to highlight a theme which is highly important to Production Planning and Control (PPC) in the scientific Brazilian literature