摘要:

The problem of allocating non-identical machines among non-identical servers is considered under steady-state conditions for the case of quasirandom input and exponential service times. Machines are assigned to operators with the objective of minimizing an expected cost model of the queueing system. Different classes of machines have different service rotes and, for a given class of machines, the service rates are different among servers. A pattern search procedure is used to solve the resulting optimization problem. Computational experience is presented, together with an analysis of the sensitivity of the model to errors in estimating the values of the parameters of the model.

ISSN:0020-7543    

DOI:10.1080/00207547608956616

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

‘ Bowl phenomenon ’ refers to the increase in production rate obtained by unbalancing a series production system such that the service time increases progressively on either side of the central stage(s). While such a result is valid for production systems with otherwise identical stages, earlier studies have suggested that a different effect may come into play when the stages of the system differ in their variability. In the simplest case of n two-stage system, production rate could be improved by shifting a part of the work load from the more variable stage to the less variable one.

ISSN:0020-7543    

DOI:10.1080/00207547608956617

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A coat model is presented in this paper for balancing a stochastic assembly line where the incompletions on the line are handled on the basis of a modular assembly concept. The model proposed is a modification of the approach by Kottas and Lau and incorporates the provision of task times being greater than the cycle time for a customer oriented production system offering structural variations in the product. The assembly line was simulated using the balance obtained by the proposed model for estimation of in-process-atorage capacity for physical layout and design of the assembly line.

ISSN:0020-7543    

DOI:10.1080/00207547608956618

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Computer time-sharing is having a powerful effect on managerial decision-making in the cost analysis and estimating area, through the easy availability of multiple regression analysis. Unfortunately, the regression technique is still obscured by factitious technicalities, while the very nature of cost problems limits the value of conventional statistical techniques in evaluating the usefulness of an analysis.

ISSN:0020-7543    

DOI:10.1080/00207547608956619

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Regression techniques provide the cost analyst with a valuable analytical tool. This paper describes means of expanding the utility of regression analysis applications in this area. Part I of the paper presented basic definitions and developed measures to assess the accuracy and sensitivity of a regression formula. In particular, it was shown that the Association index, rather than the more commonly used R1, is the pertinent measure of formula sensitivity. We also described several other aspects of evaluating formula reliability—the confidence level, variability in the data, parameter stability, autocorrelation—and discussed indexes especially developed to quantify these factors.

ISSN:0020-7543    

DOI:10.1080/00207547608956620

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A limitation of the Swift test for drawability is that, being based on the drawing of a round cup, it cannot bo applied to non-circular cups. To be applicable to non-circular cups the definition of drawability, and the test or tests based on it must entail a more generalized concept than the largest drawing ratio. Such a generalized definition, is proposed, and it is derived from the basic ideas in the Swift test. A measuro for the draw-in, analogous to the surface strain, is proposed to replace the drawing ratio and the boundary of the product is defined both for specifying the stage at which the drawing operation is completed and for the determination of the draw-in. The choice of the blank size, which is simple in the Swift teat, becomes more complex in the case of cups with boundaries of different sizes. In the non-circular cups, the maximization of the draw-in, which is basic and essential to the concept of drawability, can be achieved by choosing the shape and the orientations of the blank, as well as the size. Actual examples are shown of the variation of drawability with the size of the blank, the shape of the blank, the orientation of the blank, the size of the boundary of the product, as well as with the shape of the cup.

ISSN:0020-7543    

DOI:10.1080/00207547608956621

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207547608956622

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor