摘要:

Recycling has been recently recognized as one of effective tools for solving environmental problems. In this respect present and future manufacturing systems should take the recycling of materials used into consideration. This paper points out the issues contained in such a recycle-oriented manufacturing system, then the basic parts-flow in the product's life cycle is clarified by taking account of re-use and re-production of the parts contained in the product. A model is constructed to maximize two measures of performance—total profit and recycling rate. This is solved by goal programming. Finally, a numerical example is used to demonstrate the effectiveness of the model proposed.

ISSN:0020-7543    

DOI:10.1080/00207549508904802

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This paper develops a cell formation approach for a class of cellular manufacturing systems in which intercell moves are restricted to flow in one direction from one cell to the cell immediately downstream, without backtracking. An optimal zero-one integer programming model is used to determine which machines and parts should be assigned to cells and to specify the relative position of the cells on the factory material flow pattern. The model subdivides, the underlying manufacturing system into cells based on an intercell traffic minimization criterion and subject to machine capacity and operations sequence constraints. The model also considers part setup and run times for the evaluation of capacity requirements.

ISSN:0020-7543    

DOI:10.1080/00207549508904803

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Providing a powerful interactive tool for the scheduler to quickly and easily react to the inevitable rescheduling changes is mandatory in today's complex and flexible manufacturing environment. The conventional approaches either employ the regeneration method, which results in unsatisfactory response times, or use. methods that require too much manual intervention for editing operations to be changed. A new rescheduling method is proposed in this paper which addresses these problems. The fundamental scheme of this rescheduling method is based on a scheduling graph as well as concepts of time effect and relationship effect. The scheduling graph is an alternative representation structure of a schedule Gantt chart. The time effect and relationship effect provide functions of (1) identifying those operations that require revision, (2) revising those identified affected operations (via a partial change of the scheduling graph structure) and (3) updating starting and ending times of those revised operations. The rescheduling method both reduces manual intervention of rescheduling to a minimum and permits net change (opposite to regeneration) rescheduling to be achievable. This rescheduling method can be embedded in current computer assistance scheduling systems so as to enhance their effectiveness.

ISSN:0020-7543    

DOI:10.1080/00207549508904804

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

In this paper a case study for maintenance optimization is presented. The theoretical features of the model, an age-based replacement model taking into account non-zero repair times, are briefly discussed. The main part of the paper focuses on the application aspects of such problems like data gathering and finding the appropriate solution method. An extensive discussion of the results concludes the paper.

ISSN:0020-7543    

DOI:10.1080/00207549508904805

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This paper addresses the problem of estimating the expected profit for an automatic filling operation when the standard deviation of the filling process is unknown. For 100% inspection, a procedure is developed for obtaining an estimated confidence interval for the expected profit.

ISSN:0020-7543    

DOI:10.1080/00207549508904806

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A hybrid image processing technique is described which combines traditional feature extraction and windowing with a new artificial intelligence technique based on weightless neural networks. This technique is a unique way of compressing and then analysing complex data. Described here is its application to the measuring of light scattered for machine surfaces as well as the inspection of complex and highly coloured images. These examples illustrate the distinctive nature of the system. It is called WISE (Windowed Image Shaped Extraction) because it describes the stages of image processing.

ISSN:0020-7543    

DOI:10.1080/00207549508904807

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The main purpose of adopting cellular manufacturing (CM) is to achieve a preferred compromise between flow-line efficiency and job-shop flexibility. This paper presents a bicriterion approach to seek such a preferred design compromise in converting functional manufacturing systems into focused CM systems. The problem is formulated as a bicriterion nonlinear-integer programming model. The number of part types accommodated into the focused cells is employed as a measure of system flexibility and the average system similarity level is used as a measure of system efficiency. A heuristic algorithm, consisting of seeding, grouping, and inserting modules, is then proposed to solve the model. Finally, an example problem is included to illustrate the application of the model and solution procedure.

ISSN:0020-7543    

DOI:10.1080/00207549508904808

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Worker flexibility is an attractive option for enhancing manufacturing performance, since it provides several strategic advantages, and also allows the firm to buffer against uncertainty. In this paper, we investigate issues related to acquiring a flexible work-force in those dual resource constrained (DRC) job-shops that have high learning costs and the presence of worker attrition. Our results show that significant improvement in traditional shop related measures can be attained at even very high attrition rates by incrementally training each worker in one additional department. However, this improvement comes at the expense of productivity losses which shop managers may not be willing to accept. The nature of the tradeoffs that exist in acquiring this incremental worker flexibility are addressed. Two strategies for improving shop performance, based on incrementally training workers or reducing attrition rates, are also recommended for the DRC shop modelled in our study. Conditions under which either of these two strategies should be pursued by the shop managers are also identified.

ISSN:0020-7543    

DOI:10.1080/00207549508904809

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

In this paper, we study the problems of launching and dispatching of parts in closed manufacturing systems with flexible routeing. For the manufacturing systems being operated against multiple performance criteria, we postulate that controlling different aspects of the operational control strategy to meet one single performance criterion would improve overall system performance. It is suggested that to achieve production rates, launching rules be utilized and to affect flowtime, dispatching rules be manipulated. Also, for measurement of routeing flexibility, an entropic measure of flexibility is refined. The entropy-based rule is then compared with the dispatching rules commonly used in the industry. Control strategies are developed for a test system and it is shown that a hierarchical control strategy works best when multiple performance criteria are of interest.

ISSN:0020-7543    

DOI:10.1080/00207549508904810

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

In this paper, the resilience of loading policies to changes in part type demand is analysed. Two loading policies are compared: the maximum production rate policy and the minimum cost policy. The loading policies’ resilience is measured by the operational flexibility that is imparted to the FMS by the policy when the FMS is faced with changes in the part type demand distributions. Results show that changes in part type demand do not statistically affect the resulting FMS makespan. However, as demand increases, the minimum cost policy imparts more routeing flexibility to the FMS than the maximum production rate policy. Likewise, as the demand decreases, the minimum cost policy results in a larger capacity flexibility measure than the maximum production rate policy. In summary, the minimum cost policy, while lowering inventory by as much as 48%, is found to increase system routeing flexibility by as much as 17% and capacity flexibility by 7% without statistically affecting planned makespan.

ISSN:0020-7543    

DOI:10.1080/00207549508904811

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor