摘要:

This paper orders in preference various scheduling policies comprised of dispatching and regeneration rules in a multi-level assembly production system. Traditional expected-value statistical and second-degree stochastic dominance preference ordering rules are used to identify the most efficient-scheduling policies for risk-averse managers using various measures of performance. The results indicate that selection of an efficient regeneration rule is contingent upon the selection of a dispatching rule and these rules must be selected jointly to develop efficient scheduling policies. For this study, simple intuitively appealing scheduling policies were found to be efficient.

ISSN:0020-7543    

DOI:10.1080/00207548608919725

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The relationship between the normal and tangential forces in grinding has been the subject of a number of research reports. There is a broad measure of agreement that the relationship between these forces is based on the coefficient of friction μ and a constant, the value of which is dependent on the grinding process parameters. This paper further considers the nature of the relationship between the forces, and using previously published values and results, advances empirical formulae to show how the values for the coefficient of friction and the constant will vary for a range of wheelspeeds, metal removal rates and dressing leads. The value for the coefficient of friction is shown to be highly dependent on the heat input to the process, thus-confirming some of the conclusions of earlier research.

ISSN:0020-7543    

DOI:10.1080/00207548608919726

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Current research in cutting tool technology i9 based on absorption costing; within this paper however, this is shown to be an incorrect technique to use. When variable costing, together with DCF, is correctly used, the traditional assumptions which typically result in a 15 minute tool life are found to be erroneous, with the optimum cutting conditions being markedly different from those recommended within existing literature. It is also demonstrated that by. using a correct financial methodology, the viability -of advance processes such as CNC and FMS are improved because the cutting conditions for such machines should differ greatly from those for inexpensive machine tools.

ISSN:0020-7543    

DOI:10.1080/00207548608919727

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The three grinding processes, namely, surface, internal and external are simulated using a specially designed computer program. The grinding wheel cutting profile is generated randomly using probabilistic techniques

ISSN:0020-7543    

DOI:10.1080/00207548608919728

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A new design procedure for single sampling plans by attributes has been developed by us from the viewpoint of Kullback-Leibler information. Generalization of this process is considered for single sampling plans by variables. The proposed design procedure is simple and applicable to practical usage not only in. the case of sampling plans by attributes but also by variables.

ISSN:0020-7543    

DOI:10.1080/00207548608919729

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In this paper we present two heuristics (TIMROS and TIMGEN) for allocating resources to activities of projects under single-resource constraints. The heuristics are based on criteria which utilize the duration and resources required for each activity. Allocation of resources is then performed according to the priority ranking of the activities with respect to the developed criteria.

ISSN:0020-7543    

DOI:10.1080/00207548608919730

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The first paper of this series demonstrated a technique for classifying companies according to production control complexity using numerical taxonomic methods. Six company types were identified within the engineering batch manufacturing sector. These six company types have been used as the basis for assessing the effectiveness of production control systems in particular situations. The analyses, presented in this paper, show that the level of benefits expected from particular systems can be predicted, and that the order of subsystem implementation and the mode of operation will have considerable effect on the efficiency of a system.

ISSN:0020-7543    

DOI:10.1080/00207548608919731

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Productivity increases attributed to the Japanese management approach known as just-in-time (JIT) include better customer service, higher quality levels, increased labour and machine efficiency and reduced inventory levels. These potential benefits, as well as others, have caused many large companies to examine JIT. Most of this interest has been focused on JIT applications for large repetitive manufacturers. Research, and the experiences of some managers, indicate its potential in job-shop and process industry environments. Little research has been conducted in small manufacturing environments

ISSN:0020-7543    

DOI:10.1080/00207548608919732

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper considers the multi-dimensional effects of demand uncertainty (and other environmental characteristics) in connection with a time-phased order-point system in a rolling schedule environment. Recorded performance variables were: the number of stockouts, the maximum stockout in a period, the service level, the inventory level and the number of orders placed. The system was observed under three conditions: no demand uncertainty, demand uncertainty present but no safety stocks and demand uncertainty present with safety stocks to counter its effects. Stockouts, larger inventories and more orders occurred simultaneously when demand uncertainty was introduced in the operating environment. Service levels were reduced and inventory levels increased when forecast errors became larger. Injection of safety stocks to counter the effect of the forecast errors further increased the inventory levels and the order frequency. The dramatic differences between environments with and without demand uncertainty suggest that research findings achieved under deterministic conditions may have little relevance in more realistic stochastic environments.

ISSN:0020-7543    

DOI:10.1080/00207548608919733

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Two types of heuristic capacity-control policies are evaluated using a simulation model of a materials-requirements-planning production system. The control-policy decisions are based solely on the size of the queue, as measured in standard hours of work, at each work centre in the production system. Several classes of product mixes and product structures and several levels of the control parameters of each policy, are investigated. The results indicate that each control policy gives rise to a unique population of weekly labour, work in process and intermediate inventory level. Product structure is identified as a major variable in materials-requirements-planning systems performance. Sensitivity analysis of the cost functions for each policy indicates the conditions under which it will minimize the sum of labour costs, work-in-process holding costs and inventory holding costs.

ISSN:0020-7543    

DOI:10.1080/00207548608919734

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor