摘要:

We consider the problem of a, machine shop in which some items are made specially to customor order while other items are made for and subsequently sold from finished goods inventory. It is assumed that both types use the same set of facilities in their manufacture. However, whereas we may have some choice in the timing of replenishment orders which are manufactured for stock, the demands for make-to-order items will not generally permit the same degree of freedom. Consequently when congestion difficulties arise through facility overloading it is often the ‘ stock orders ’ which arc forced to wait. In this case study we present an attempt to measure the relationship between the level of shop congestion and the degree of retardation of stock leadtimes. Clearly if correlation exists, then we might conversely be able to assess maximum loading levels in the light of the stock leadtimes which are deemed to be desirable.

ISSN:0020-7543    

DOI:10.1080/00207547308929966

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Human operator output in the performance of repetitive tasks increases with practice, resulting in the ‘ learning curve ’ graph well known in industrial engineering circles. This paper describes the construction of a systems model of the learning curve, the model parameters such as the learning time constant being readily estimated graphically from historical data or in advance of the event using a digital computer algorithm. Learning curve models for individual operators, and for groups of operators, are then used as basic elements in a managerial control system, the inputs to this system being operator effort, industrial engineering effort, and material and financial resources, whilst the output will be completed tasks. The managerial control system is designed to increase productivity by considering four separate feedback loops incorporating the monitoring of individual performance, monitoring of training schemes, updating of time standards, and identification of worker spare capacity leading to group incentive and bettor performance. Each loop is illustrated by an example taken from industry, with associated cost benefits estimated directly from the learning curve models.

ISSN:0020-7543    

DOI:10.1080/00207547308929967

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Two equations hove been obtained using regression analysis techniques which can be applied to determine storage space requirements with acceptable accuracy and minimum effort. By defining all items by means of a common parameter—packing factor—it was possible to ignore the individual weights of each item, yet still load the transport and storage unit to some practical load limits. The method used in this paper is general and can be applied to similar problems with different boundary conditions.

ISSN:0020-7543    

DOI:10.1080/00207547308929968

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

In this paper, a composite cost-oriented priority scheduling rule is compared to three other well-known rules, that are basically time-oriented. The criteria used for comparison include : total cost per job, number of late jobs, machine utilization, in-process inventory and the number of late jobs in-process. Repeated measures analysis of variance is used and followed by mean comparisons. Results suggest that SPT and cost rides are preferred in most of the criteria.

ISSN:0020-7543    

DOI:10.1080/00207547308929969

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A methodology which utilizes integer programming is developed as an aid to designers of production facilities. Specifically, the methodology can be used to determine optimal unloading configurations for mixed discrete products obtained from a production process which cannot be halted (clue to physical constraints or economies) and which has no in-process storage. The methodology is practical ; application to the design of unloading facilities for an existing float gloss process is given. Tests of the design methodology reveal that it gives least cost answers.

ISSN:0020-7543    

DOI:10.1080/00207547308929970

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The Flat Generating System considered has been used on automatic lathes for many years. Its function is to generate parallel flats, squares, hexagons and other regular patterns of flats on turned components as part of the turning operation. Figure 1 illustrates two typical components with hexagons produced by this System.

ISSN:0020-7543    

DOI:10.1080/00207547308929971

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Acceptance sampling plans are designed under the assumption of perfect inspection. However, inspection tasks are not, even under ideal inspection conditions, free of error. In this paper we consider the effects of inspection error on probability of acceptance, average outgoing quality, and average total inspection. These measures are examined under both replacement and non -replacement assumptions. Also, a method is presented whereby an acceptance sampling plan may be designed which explicitly considers inspection error.

ISSN:0020-7543    

DOI:10.1080/00207547308929972

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A brief description is given of a programme for job shop simulation, which has been developed at Imperial College, for use by research workers and practitioners.

ISSN:0020-7543    

DOI:10.1080/00207547308929973

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207547308929975

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207547308929977

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor