摘要:

The responsibilities of quality assurance departments have increased in many organizations, resulting in increased information requirements. Now more quality assurance data must be collected, managed, analysed and reported. Consequently, some Arms are developing quality assurance management information systems. This paper describes the development of such a system at Motorola Inc. The reasons for developing this system are described as well as the design objectives, the system that was developed and the resulting benefits. Plans for enhancements to the system are also given.

ISSN:0020-7543    

DOI:10.1080/00207547908919605

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Eight subjects performed a paced conveyor inspection task of small zinc-plated washers. There were two fault types, one considerably more difficult to detect than the other. Each fault type had a probability of occurrence of 0-0, 0-025 or 0 05 providing eight different batch conditions, four where only one fault type was present and four where both were present. All subjects were tested twice on each of the eight conditions. There were 1800 washers in each batch condition, which were inspected at a rate of 3 per second. The results demonstrated that the probability of detection of either fault type was significantly reduced when subjects were searching for the two fault types simultaneously, the decrease in probability being greater the larger thea prioriprobability of the other fault type. Signal detection theory analysis suggested that these results were due to changes in sensitivity rather than in response bias. The classical vigilance effect of signal probability was not observed.

ISSN:0020-7543    

DOI:10.1080/00207547908919606

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In this paper, a managerial perspective is applied to the traditionally technological problem of yarn wastage in the carpet manufacturing sector. An empirical investigation is carried out to detect the errors arising in the spinning and tufting parts of the production process. A simulation package is then developed to investigate how such errors determine the overall level of waste yam remaining after production.

ISSN:0020-7543    

DOI:10.1080/00207547908919607

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Most of the variation in linear measurements is caused by lack of proper consideration of the variables that can and do enter into any measurement. No matter how precise the instrument is, it does not correct the variables that the operator is supposed to take account of and make the proper corrections for. This paper shows that, under realistic conditions, a temperature gradient of 0’7°C across the slab of a granite surface table contributes to the uncertainty of flatness measurement by as much as 25-37% of the permissible tolerance on the granite surface table under consideration.

ISSN:0020-7543    

DOI:10.1080/00207547908919608

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

This paper examines a model for an inventory system which stocks two types of items: repaired and unrepaired. This model extends a previous model developed by Schrady to allow for a finite repair rate at the repair depot. Formulas for the optimal repair and procurement batches are developed and extended to the case where there is limited storage space in both the repair and supply depots.

ISSN:0020-7543    

DOI:10.1080/00207547908919609

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Several lot sizing rules exist to aid managers in the decision-making process as it pertains to determining the appropriate lot size in a materials requirements planning system! The literature in this area has almost exclusively focused on the single-level lot sizing problem. In this paper, the multi-level lot sizing problem is examined. This study consists of six different demand patterns (master schedules) and four different lot sizing rules. The rules are economic order quantity, least total cost, lot for lot and period order quantity. The study looks at these rules in combination. Therefore, sixteen different lot sizing sequences are examined for each of the six forecasts. Conclusions are drawn as to the relative efficiency of the lot sizing sequences, and suggestions for further research are made.

ISSN:0020-7543    

DOI:10.1080/00207547908919610

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The purpose of this paper is to describe a new formulation of the mixed-model sequencing model in such a way as to minimize the risk of stopping the conveyor under the circumstances of system variability and to develop an efficient heuristic method for large-scale, mixed-model assembly lines. The proposed method always produced optimal solutions for. randomly constructed small-scale, mixed-model sequencing problems for which the optimal solutions were available through the application of the improved branch and bound method. The method should produce excellent (and almost always optimal) results for actual large-scale, mixedi-model sequencing problems.

ISSN:0020-7543    

DOI:10.1080/00207547908919611

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

This paper presents the results of a research study undertaken to assess the variability and model the distribution of R.M.S. surface roughness values obtained in fine turning of AISI 4140 steel using cemented carbide tools of 1/32 in. nose radius. Work specimens of about 30 in. length and 3/2 in. diameter were utilized for the experimental work. Three cutting tools were used making use of one cutting edge in each tool. Each cutting edge was used to fine turn about 15 work specimens. An analysis of variance was performed to ensure that there was not any significant difference in the surface roughness values generated by the three cutting tools. In modelling the distribution of surface roughness values chi-square and Kolmogoroy-Smirnov goodness of fit tests were applied.

ISSN:0020-7543    

DOI:10.1080/00207547908919612

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In the area of production planning, the technology transfer from the developed world to developing countries should take into account the expensive machinery and economies of scale. In developed countries, equipment is cheap but manpower is expensive. Thus production planning models are built so that manpower is never idle. In developing countries the machines are much more expensive and maintenance plays a bigger role. Thus production planning models should be built which include the machine idle cost and maintenance costs. This paper explains how such models can be analytically developed. Finally, it is -shown that demand can be stimulated though economies of scale and inductrial goods can be provided at much cheaper rates.

ISSN:0020-7543    

DOI:10.1080/00207547908919613

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In this paper the machining time and coat of turning operations using ceramic cutting tool inserts are discussed. A general sensitivity analysis approach is outlined and its application to a developed cost function for the aluminium oxide tools is presented using the cutting speed as the decision variable. Case problems are discussed and a method for calculating the range of cutting speed for a predetermined increase in coBt is given.

ISSN:0020-7543    

DOI:10.1080/00207547908919614

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor