ISSN:0740-817X    

DOI:10.1080/07408179208964229

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The Workshop on Electronics Manufacturing Research was held in College Station, Texas, on February 24-26, 1992. It focused on the Industrial Engineering/Operations Research/Management Science disciplines and their capabilities in modeling, analysis, and manufacturing technology. The primary goal was to identify the critical research needs in electronics manufacturing and assembly that can be addressed by these disciplines and the means of accomplishing them.

ISSN:0740-817X    

DOI:10.1080/07408179208964230

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Printed circuit card assemblies form the core of a vast array of contemporary manufactured products. The technologies for assembling printed circuit cards require a hierarchy of complex decisions for grouping card types and processes, staging components at assembly machines, arranging feeders, and sequencing placement operations. This paper is motivated by the largely unmet needs of industrial process planners for computer aids. Our objective is to develop a framework for the printed circuit card assembly process planning problem and to assess the current state of the research on appropriate models and solution methods. We first provide an overview of the essential elements of printed circuit card terminology, assembly technologies, and assembly system operations. Then we propose a decision hierarchy, survey the published literature, and identify needs for future research.

ISSN:0740-817X    

DOI:10.1080/07408179208964231

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Consider computer numerically controlled placement machines which populate printed circuit boards with surface mounted components. These highly concurrent systems require a hierarchy of decision models to determine efficient machine setups and operational sequences so as to achieve effective throughput rates. The Feeder Assignment models developed here can be used to determine the particular stations in which each component fixture is to be attached to the carrier. Noninterference and space constraints may also need to be addressed. Several nonlinear objectives are developed to minimize "excess delay" due to carrier movements. These nonlinear formulations are then transformed to achieve equivalent Linear Mixed Integer Programming formulations. Carrier movements are often the slowest of the concurrent processes and therefore can cause significant deterioration in the overall system performance, if not adequately addressed and properly integrated into a hierarchical decision process. The methodology is illustrated by developing detailed assignment models for a dual delivery system. This system is highly illustrative of the difficulties and advantages arising in the modelling of these complex, concurrent systems. Adapting the general methodology to other machine designs and different manufacturing environments is also discussed.

ISSN:0740-817X    

DOI:10.1080/07408179208964232

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Although the national importance of the semiconductor industry is widely acknowledged, it is only recently that the production planning and scheduling problems encountered in this environment have begun to be addressed using industrial engineering and operations research.techniques. These problems have several features that make them difficult and challenging: random yields and rework, complex product flows, and rapidly changing products and technologies. Hence their solution will contribute considerably to die theory and practice of production planning and control. In a two-part project we present a review of research in this area to date, discuss the applicability of the various approaches and suggest directions for future research. In this paper, Part I, we describe the characteristics of the semiconductor manufacturing environment and review models related to performance evaluation and production planning. Part II will review research on shop-floor control in this industry to date.

ISSN:0740-817X    

DOI:10.1080/07408179208964233

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Analyzing the capacity of production facilities in which manufacturing operations may be performed by alternative machine types presents a seemingly complicated task. In typical enterprise-level production planning models, capacity limitations of alternative machine types are approximated in terms of some single artificial capacitated resource. In this paper we propose procedures for generating compact models that accurately characterize capacity limitations of alternative machine types. Assuming that processing times among alternative machine types are identical or proportional across operations they can perform, capacity limitations of the alternative machine types can be precisely expressed using a formulation that is typically not much larger than the basic linear programming formulation that does not admit alternative resource types. These results have important implications for industrial practice, suggesting that in the case that processing times are nearly proportional among alternatives, the prevalent approximation that involves using a single, capacitated, artificial resource may be dropped in favor of our formulation incorporating the approximation that processing times among the alternatives are proportional. Another advantage is that the set of capacity constraints we formulate can be used to check the feasibility of suggested production schedules or demands simply by plugging mem into the constraints, without need to develop values for allocation variables.

ISSN:0740-817X    

DOI:10.1080/07408179208964234

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Consider the single machine scheduling problem where there are a number of part types to be processed. A part type is defined as follows: Two parts are of the same part type if the machine does not require a setup in between the processing of these parts. The problem investigated in this paper is to find a sequence of batches of parts (if there are any) where all the requirements for parts are met. A heuristic and an exact algorithm are developed, and computational analysis is performed to measure the performance of the heuristic. The time complexity function of the heuristic is O(n2), and the exact algorithm runs in polynomial time given a fixed upper bound on the number of setups.

ISSN:0740-817X    

DOI:10.1080/07408179208964235

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This paper demonstrates how knowledge of future arrivals can be used to control bulk service diffusion and oxidation processes. The objective of the research reported herein is to reduce the average time that lots spend waiting to be processed. A review of the current literature reveals that several researchers have dealt with the control of bulk service queueing systems; however, only one has addressed the use of knowledge of future arrivals and it only considered the case of a single product and a single server. This research reexamines the single product-single server case, and men explores the multiple products-single server case. For both cases, a control strategy is devised and evaluated through the use of systems simulation. The steady-state performance of each control strategy is then compared to the steady-state performance of the theoretical optimal control strategy not considering the timing of any future arrivals (i.e. a Minimum Batch Size strategy). The experimental results indicate that the control strategies developed in this paper perform well under most circumstances.

ISSN:0740-817X    

DOI:10.1080/07408179208964236

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

We develop structural results and an approximation for the throughput of an assembly system fed by multi-station fabrication lines where releases are governed by the CONWIP protocol and all machines have deterministic processing times but are subject to random outages. This formulation is motivated by a printed circuit board manufacturing process.

ISSN:0740-817X    

DOI:10.1080/07408179208964237

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0740-817X    

DOI:10.1080/07408179208964238

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor