摘要:

AbstractEmpirical research on learning curves and documented applications of the learning curve concept to service systems are rare in the literature. In this paper, a learning curve model proposed by the author in earlier research focusing on manufacturing systems is extended to typical food service operations performed by the same contractor at several military facilities in the United States and abroad. An actual application of the model to a bidding and work force planning situation is also described.

ISSN:0160-5682    

DOI:10.1057/jors.1991.128

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThis paper discusses the application of the analytic hierarchy process (AHP) to the selection of a doctoral programme. The first section of this paper includes a brief discussion of the AHP. In the next section, we describe a hierarchy for selecting a doctoral programme that includes the perspective or career objective of the decision-maker as what we call a pseudo-level. This is followed by an illustration of the hierarchy in a case study with MBA students contemplating a doctoral programme. Finally, we discuss the results and highlight the importance of perspective as a discrete criterion that should not be included as another level of the hierarchy in the usual way.

ISSN:0160-5682    

DOI:10.1057/jors.1991.129

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThis paper addresses an actual production planning problem for a large seed corn production company. Various scenarios are included in different mathematical programming models in order to help the management make production decisions. A linear programming package and a mixed-integer programming package are combined by a designed heuristic program to solve the problem. The solutions obtained and an accompanying sensitivity analysis provide the management with insight into the system's operation and potentials of cost savings.

ISSN:0160-5682    

DOI:10.1057/jors.1991.130

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThis paper concerns a study of the cutting-stock problem faced by a small company in the building components industry in Singapore. It involves the development of a simple heuristic procedure which is able to recommend cutting patterns tailored to the specific needs of the company. To help determine the appropriate stock lengths to order, a simulation-cum-sampling approach is proposed. The pattern-generating heuristic has been tested using real-life project data. The results obtained are very encouraging in that the goals set by the management of the firm are met well within the numerous constraints faced.

ISSN:0160-5682    

DOI:10.1057/jors.1991.131

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe different problems of sequencing production operations in parallel processor shops of a textile company are considered in this paper. The complexity of these problems depends on: (1) the machine changeover times which occur when the changeovers cannot be realized in parallel during processing times, and (2) the operation due dates which have to be at best respected when the workshops do not constitute stocks. The objective is to minimize mean completion time or mean tardiness. This paper models these different scheduling problems. It presents some tools to solve these problems, and it explains the choice of algorithms issued from the graph theory and employed in industrial studies. Some results are shown.

ISSN:0160-5682    

DOI:10.1057/jors.1991.132

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractIn this paper an algorithm for a cutting stock problem in the wood industry is presented. Cuts are of guillotine type and requirements have to be met exactly, i.e. no over- or under-production is allowed. There are several different board sizes from which panels can be cut and the problem is to find the best mix of boards and respective cutting patterns that satisfies the demand for panels with minimum wastage. The heuristic algorithm uses a pattern-building procedure combined with an enumeration scheme for the mix of boards.

ISSN:0160-5682    

DOI:10.1057/jors.1991.133

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractWe consider the problem of locating two facilities so as to minimize the maximum of combined Euclidean distances to unweighted existing points when the facilities must be separated by at least a specified distance. Interpreting the problem as the minimum covering ellipse problem, we employ an interactive graphical method which easily produces near-optimal solutions. We describe the method, implemented on a microcomputer, because it exemplifies the more general technique of interactive optimization.

ISSN:0160-5682    

DOI:10.1057/jors.1991.134

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThen-job, single-machine total tardiness problem is considered in this paper. A branching algorithm based on three theorems is proposed to generate a reduced set of candidate sequences. The computational results indicate that the proposed algorithm provides a smaller set of candidate sequences than the DP algorithm of Schrage and Baker.

ISSN:0160-5682    

DOI:10.1057/jors.1991.135

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractMaterial handling in job shop environments is accomplished through the transfer of parts between work centres. Parts that are grouped together prior to transfer form a unit load. A new method is proposed for determining the unit load size, called the economic move quantity (EMQ), based on cost considerations during the design phase of the production system. EMQ takes into account system performance through the use of a queueing network model.

ISSN:0160-5682    

DOI:10.1057/jors.1991.136

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe classical economic production quantity (EPQ) model assumes that items produced are of perfect quality and that the unit cost of production is fixed. However, in realistic situations, product quality is never perfect but is directly affected by the production processes and the quality assurance programme. In addition, the unit production cost is not fixed but increases with quality assurance expenses. We present an EPQ model with imperfect production processes and quality-dependent unit production cost. After discussion of the procedure for determining the optimal solution, a sensitivity analysis of the impacts of the cost parameters on the optimal solution is provided. Finally, the problems associated with cost estimation are addressed.

ISSN:0160-5682    

DOI:10.1057/jors.1991.137

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor