摘要:

Within the past several years, considerable research has been devoted to the aggregate production planning problem starting with the pioneering work of Holt el al, (1955) and the resulting Linear Decision Rule (LDR). However, researchers have also recognized that developing optimal aggregate production plans, per se, is not sufficient for solving real problems; these plans have to be disaggregated into specific schedules for specific products. Consequently, the thrust of current research is on the ‘disaggregation’ problem. Simultaneously a number of companies have been installing MRP systems with reports of significant improvements in inventory control, production planning, work force scheduling and production costs. This paper reports on an experiment which was designed and conducted to compare the effectiveness of the ‘aggregate-disaggregate’ and MRP approaches to production planning in a simulation environment. LDR was used as the optimal aggregate technique in the aggregate-disaggregate approach. The results appeared to favour the MRP approach

ISSN:0020-7543    

DOI:10.1080/00207548308942413

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper two mathematical models are developed for an inventory system in which the units are deteriorating at a constant rate and the demand rate decreases negative exponentially. In the first model it is assumed that replenishment orders are placed at equal intervals while in the second model the replenishment times are also variables and hence there is no need for the replenishment orders to be placed at equal intervals. Optimal replenishment policies are determined for both cases. A numerical example is used to illustrate the theory. Computational results indicate that the constant replenishment period policy leads to a higher total cost.

ISSN:0020-7543    

DOI:10.1080/00207548308942414

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A 23factorial experiment was conducted based on a discrete-time computer model to elucidate the effects of system configuration, relative stage position and buffer capacity allocation in automatic transfer line systems under steady-state conditions. A total of 96 simulated experiments were conducted. It was found that second and third-order interaction effects could be statistically significant, a potentially useful result being the possibility of increasing production rate and decreasing average in-process stock simultaneously

ISSN:0020-7543    

DOI:10.1080/00207548308942415

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper a hierarchical decomposition-based approach to the planning of an electronic tube production unit is presented. A mid-term planning level computes a manufacturing plan over a discretized horizon by using a decomposition method for solving large linear programming problems. Then a short-term level schedules the first week objective previously calculated. Special attention is paid to the planning level

ISSN:0020-7543    

DOI:10.1080/00207548308942416

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper presents an implementation of a decomposition-coordination approach to petroleum refinery production scheduling. In this approach the scheduling problem is not formulated as a single mathematical programming model to be solved through a computerized system, but it is dealt with as amathematical programming process, in which a number of small problems are practically solved, and their solutions are combined into an overall schedule Our approach does not pursue an exact optimum, but quite satisfactory schedules have been generated from a practical viewpoint and productivity in the scheduling process has been remarkably raised

ISSN:0020-7543    

DOI:10.1080/00207548308942417

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Production management is concerned with the efficient transformation of inputs into desired outputs. Usually the operations are carried out under conditions of uncertain and fluctuating customers’ demand, varying procurement lead times for difference inputs, and the necessity to fix the production schedules long before the magnitude and the mix of the orders that must be filled from the resulting output can be determined. Under certain conditions it is possible to view production of this kind as a closed, self-regulating system which may be studied using some common techniques and procedures.

ISSN:0020-7543    

DOI:10.1080/00207548308942418

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Numerical studies have been carried out on the transient behaviour of a model for queues in series with finite waiting space. Poisson input and exponential service times have been assumed. On the basis of numerical results various conclusions have been drawn both for the transient and steady state situations concerning the servers arrangements, overflow probability, utilization etc

ISSN:0020-7543    

DOI:10.1080/00207548308942419

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Although many articles have been published on the general priority scheduling problem, very few have been concerned with directly minimizing costs. The few studies which do consider overall costs do not use these costs in establishing a job's priority in the queue. This paper investigates how the time and cost performance of jobs are affected by the use of a rule which directly considers costs. A simulation model of a hypothetical job shop is used to examine several of these cost rules, as well as some common rules concerned with the timeliness of jobs. Performance measures include both time-oriented and cost-oriented measures. The results indicate that rules which directly consider costs (or profit) may prove practical for a manager where minimization of WTP and maximization of ROT are the primary and secondary objectives of the company

ISSN:0020-7543    

DOI:10.1080/00207548308942420

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Extended octagonal rings are used in metal cutting dynamometers to measure cutting forces and torque. The controllable design variables are the thickness, radius and width of the ring. Normally the objectives of the design are to achieve high sensitivity and high rigidity which arc conflicting in nature. Therefore, both requirements cannot be achieved simultaneously. The goal programming technique is used to determine the optimum size of extended octagonal ring for various goal priorities with respect to sensitivity and rigidity

ISSN:0020-7543    

DOI:10.1080/00207548308942421

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper presents a modified model for a deteriorating inventory system determining price and production levels.

ISSN:0020-7543    

DOI:10.1080/00207548308942422

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor