摘要:

Variables acceptance sampling plans are designed under the assumption that measurement on the characteristic of interest may be performed without error. To the contrary, variables measurement tasks are often confounded by human inspection error and/or instrument test error. The net result may be characterized in terms of bias and imprecision, where (1) bias is the difference between the true dimension of a unit of product and the average of a long series of repeated measurements on that unit, and (2) imprecision is the dispersion of repeated measurements on the same unit of product.

ISSN:0020-7543    

DOI:10.1080/00207547508943003

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The loss-cost function for control schemes usingnpcharts is derived and the loss-cost surface is investigated. Numerical examples of minimum cost designs are studied to see how variation in the various risk and cost factors affects the economic optimum.

ISSN:0020-7543    

DOI:10.1080/00207547508943004

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

An optimal attribute control chart has been derived in two stages. Initially the conditions for the fictitious specification limit of compressed-limit gauging acceptance sampling plans to obtain a minimum sample size have been adapted to control charts. Using these requirements for minimum sample size, the sample size, the frequency of sampling, and the extent of the control limits from the fictitious process average have been determined, assuring the minimum expected total cost incurred in utilizing narrow-limit gauging fraction-defective control charts for controlling current production.

ISSN:0020-7543    

DOI:10.1080/00207547508943005

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Application of basic statistical theory shows that ‘ sudden death testing ’ is an accelerated teat procedure for specimens having a Weibull ‘ life to failure’ distribution only if the shape parameter is less than 1-6. In no case do the non-failed test specimens contribute to estimating efficiency and sudden death testing is in general a more costly procedure, than full tests of equivalent statistical content.

ISSN:0020-7543    

DOI:10.1080/00207547508943006

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This paper presents the results of an investigation which compared tool life values obtained from three accelerated tool life testing methods : the facing method, the taper turning method, and a curtailed conventional method, with a ‘ full time ’ conventional testing method. In addition, the experiment was repeated, using tools having an artificial wearland prehoned on the cutting edge of a sharp tool to investigate the effect on data variability occurring with the prehoned wearland tools. The research was conducted under single point turning conditions, using disposable carbide insert tools. The tools and workpiece. materials were utilized in the ‘ as received ’ condition in an effort to try and duplicate actual shop usage as closely as possible. The tool life criterion value chosen was flank wear.

ISSN:0020-7543    

DOI:10.1080/00207547508943007

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A finite horizon inventory problem is encountered whenever a product is procured/ manufactured/sold for a limited time, after which it is replaced by another product performing basically the same function but differing in design/appearance/performance. The conventional methods cannot be applied for analysing the finite horizon inventory problem due to the discrete nature of the cost function. In this paper mathematical models have been developed for a case when a product is packaged in a number of container sizes and offered for a limited time. An example has been solved illustrating the method.

ISSN:0020-7543    

DOI:10.1080/00207547508943008

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A single product, single Btage, multiperiod production smoothing problem is considered in this paper. Demands are monotonically increasing in successive periods, and in each period, they occur at a uniform rate. The important feature is that a production run can be started or ended at any time, and not necessarily at the start of any period. Considering production costs, costs due to change of production rate and inventory costs, unique optimal policies are derived. The special feature of the solution is that no iterative search procedure is needed to arrive at the optimal policy. On the other hand, a set of three conditions are derived. Once any one of these conditions is satisfied, the optimal policy is easily determined. Cost formulae are given for optimal policies derived. Three examples are solved to illustrate the optimal policies derived. Finally scope for application of the model is suggested.

ISSN:0020-7543    

DOI:10.1080/00207547508943009

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The criticism of flow line methods has resulted in the consideration of alternative methods of production—one such method is the ‘ collective ’ method of working. In this research note the operating characteristics of unpaced flow line systems and collective systems are investigated by means of computer simulation and comparisons between the two systems are made.

ISSN:0020-7543    

DOI:10.1080/00207547508943010

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This note exposes an oversight in the development of a decomposition approach to the shop scheduling problem reported previously. Included is a brief account of the original algorithm, exposure of its weakness via a small example and a suggested modification.

ISSN:0020-7543    

DOI:10.1080/00207547508943011

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Ad important characteristic of a continuous sampling plan is the average fraction inspected. This paper presents a computationally efficient and easily programmable solution for calculation of the average fraction inspected.

ISSN:0020-7543    

DOI:10.1080/00207547508943012

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor