摘要:

Two basic approaches, the Lagrangian method and the fixer! cycle method, have been suggested for solving the problem of multi-item inventory systems with budgetary constraints. The two solution procedures are compared. A simple algorithm is developed to test which solution procedure would result in a lower cost.

ISSN:0020-7543    

DOI:10.1080/00207548108956661

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A decision model with cost as criterion is presented for aiding management in the hiring versus internal transfer decision. The model can be applied in those cases where an organization has several staff categories. If additions have to be made to these staff categories because of attrition or expansion, how should these additions be made—through hiring or internal transfer from one staff category to the next higher staff category? The model presents a solution.

ISSN:0020-7543    

DOI:10.1080/00207548108956662

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Exact expressions for the roughness height and the centre-line average value are derived for turning and milling operations. Related computer programs are given in the FORTRAN IV language. Useful tables can be obtained by means of these programs. Results are presented in terms of dimensionless variables.

ISSN:0020-7543    

DOI:10.1080/00207548108956663

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The aim of this paper is to present an approach for the evaluation of plant structural efficiency. The essence of the approach is a cost comparison of an observed plant structure for a multi-plant firm and an optimal plant structure under static conditions. The comparison makes use of a mixed-integer location model and of empirical evidence from scale economies studies. The application of this approach to a representative multi-plant firm in the German brewing industry shows that under the given assumptions the observed plant structure is inefficient.

ISSN:0020-7543    

DOI:10.1080/00207548108956664

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The environment encountered by the tool in a milling operation is particularly hostile and in practice tools having negative lands are sometimes utilized in order to improve edge strength. The type of entry and exit conditions encountered are shown to be affected by the cutting edge configuration.

ISSN:0020-7543    

DOI:10.1080/00207548108956665

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Scheduling has been a difficult problem for job shops which manufacture discrete parts. The research described in this paper investigates the hypothesis that interactive man-computer scheduling methodology is more effective in this task than a batch scheduling methodology. This hypothesis is investigated under eight different problem configurations generated by varying three job description parameters. The results have been evaluated statistically and the effectiveness of an interactive schedule compared to the slack-per-remaining-operation heuristic is investigated. Influences of the level of variation in job description parameters on the quality of the interactive schedule have also been analysed in this study. Results show that scheduling interactively is significantly more effective in most problem situations, and that the level of variation of some of the parameters has a significant impact on the quality of the interactive schedule.

ISSN:0020-7543    

DOI:10.1080/00207548108956666

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Given processing times ofnjobs on a single machine with penalties for earliness and tardiness and penalties associated with assignment of due-dates, the objective is to select optimal due-dates and optimal sequence. Scheduling procedure for the solution of this problem is presented along with proof of optimality and illustrative numerical examples.

ISSN:0020-7543    

DOI:10.1080/00207548108956667

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper examines the problems encountered by a growing demand for energy consumption and a dwindling reserve of conventional energy sources Development of alternative clean energy sources should be vigorously pursued in order to improve or maintain the quality of life. The search for new energy sources has indicated the need for developing approaches to evaluate feasibility and competitiveness of the alternative sources. Frequently mentioned as alternative energy sources are wind power, water power, tidal power, coal, fission energy with or without breeders, geothermal energy, ocean thermal energy conversion, low temperature solar energy, solar power through photosynthesis and solar electric: generation. Factors considered in comparing these energy sources are given. An illustration based on United States energy consumption rates and available energy resources provide revealing information about future directions in energy production.

ISSN:0020-7543    

DOI:10.1080/00207548108956668

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper presents the results of a case study analysis of total productivity trends within a typical British batch production company. Two models of corporate productivity are tested using historical data for 1975-79 and the results are interpreted and discussed. The paper also demonstrates how the results could be extended to produce simple predictive models of company productivity and total unit cost. The authors conclude that measures of total company productivity offer a valuable aid to decision-making for production engineers and managers.

ISSN:0020-7543    

DOI:10.1080/00207548108956669

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Statistical analysis of machine utilization has shown that about 45% of machine time is spent in tool changes between jobs. Reducing job change-over costs can therefore make a big difference in machine utilization.

ISSN:0020-7543    

DOI:10.1080/00207548108956670

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor