摘要:

ABSTRACTControlling the flow of material on the shop floor involves releasing and dispatching jobs to meet customer due‐date requirements while attempting to keep operating costs low. This report presents an evaluation of five releasing mechanisms and four dispatching rules under various levels of aggregate due‐date tightness, shop cost structure, and machine utilization using simulation. The performance criteria of total shop cost, jobs on shop floor, deviation from due dates, and job queue time are collected to demonstrate the interactive nature of releasing and dispatching on shop performa

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00260.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

ABSTRACTImplicit utility/value maximizationandexplicit utility/value maximizationare identified as two major classes of multiobjective optimization methods. Explicit methods have the advantage of being able to fully exploit the power of existing mathematical programming algorithms. A disadvantage is the high information burden they place on the decision maker. Implicit (i.e., interactive) methods have complementary strengths and weaknesses: they require less extensive information but do not lend themselves as easily to use with optimizing algorithms. We develop a hybrid implicit/explicit approach that attempts to combine the advantages of both by embedding within the implicit method a procedure that periodically formulates an approximate explicit representation of the multiobjective problem and then solves it optimally without user interaction. Operationally, this requires the frequent solution of two nonlinear programs.We also report on the implementation of this method in a forest management decision support system. This is a completely microcomputer‐based implementation currently undergoing field testing for use in planning the timing and intensity of timber harvests on non‐industrial forests in the southeastern United States. The system has been selected as a replacement for an earlier multiobjective program (Harrison and Rosenthal [28]) used by over 1,800 landown

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00261.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

ABSTRACTThis paper presents sensitivity analyses for a single‐stage decision problem where an action which will maximize the expected payoff must be chosen from a finite number of actions given the states of nature, their probabilities, and the payoffs corresponding to each action and state of nature. Three types of sensitivity analysis are developed: (1) sensitivity analysis on the probabilities keeping the payoff numbers fixed, (2) sensitivity analysis on the payoffs keeping the probabilities fixed, and (3) joint sensitivity analysis on the payoffs and the probabilities. The approach is illustrated with an example. Quite often the sensitivity analysis can be conducted by solving an appropriate linear or quadratic programming proble

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

ABSTRACTThe practice of abandoning all but the most accurate among a set of alternative forecasting methods is shown to result in the loss of potentially useful information. The particular case of two forecasts is considered in detail. It is demonstrated practically that the inclusion of even a relatively poor forecasting method can enhance a superior one significantly.

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

ABSTRACTBanerjee [1] developed a joint economic‐lot‐size model for the case where a vendor produces to order for a purchaser on a lot‐for‐lot basis under deterministic conditions. The assumption of lot‐for‐lot bases is restrictive in nature. In this note, a more general joint economic‐lot‐size model is suggested and it is shown to provide a lower or equal joint total relevant cost as compared to the mo

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0011-7315    

DOI:10.1111/j.1540-5915.1988.tb00248.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY