摘要:

The class of exponential smoothing models which vary the values of their parameters to adapt to changing conditions in a time series are referred to as adaptive forecasting techniques. In this article criteria for evaluating forecasting models are presented and the features of a simple exponential smoothing model that are exploited by the adaptive techniques are discussed. Several adaptive forecasting schemes are described and classified, and examples of the performance of these techniques are presented.

ISSN:0020-7543    

DOI:10.1080/00207547408919582

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

There are frequent occasions where the coordination of replenishment orders for selected groups of items can lead to significant savings in the costs of replenishment. This paper is concerned with a practical procedure for selecting the order-up-to-levels, can-order points and must-order points of a particular coordinated control system. Demand is Foisson and a fixed non-zero replenishment lead time is assumed. Cost comparisons with the best independent control strategy indicate that substantial savings (averaging 18-8% over some 104 examples) are possible through coordination.

ISSN:0020-7543    

DOI:10.1080/00207547408919583

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Models for production smoothing generally assume that production can be adjusted to any desired level. However, there are industries where production must be carried out at given discrete levels, for example by the opening or closure of certain facilities or by the use of shift-working. The problem is to control the operation in a way that will minimize the cost of changes in the level of production. The method explored in this paper relies on inventory levels for control purposes to trigger a switch from one production level to another. Sample results from simulation runs are cited as examples.

ISSN:0020-7543    

DOI:10.1080/00207547408919584

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper presents an adaptive exponentially smoothed control system. The adaptive nature is achieved by varying the weighting factor according to the value of a tracking signal. An example of an adaptive control chart is presented. Sensitivity curves, which present the probabilities of acceptance as a function of sampling periods after a change in a process occurs, are illustrated.

ISSN:0020-7543    

DOI:10.1080/00207547408919585

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A mathematical model for the surface roughness in a turning operation was developed in terms of the cutting speed, feed and depth of cut. Utilizing PL1 language and an IBM 360/50 computer, the model was used to generate contours of surface roughness in planes containing the cutting speed and feed at different levels of depth of cut. The surface roughness contours were used to select the machining conditions at which an increase in the rate of metal removal was achieved without sacrifice in surface finish.

ISSN:0020-7543    

DOI:10.1080/00207547408919586

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The load carrying capacity of press and shrink fitted assemblies, among other factors, depends appreciably on the roughness of the mating parts. Experimental investigations showed the role of roughness in the performance of such fits. The ability for such assemblies to withstand repeated dismantling was also analysed. Details and discussions of the results obtained are presented in this paper.

ISSN:0020-7543    

DOI:10.1080/00207547408919587

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Two simple methods for improving joint replenishment systems are given in this paper. The methods are typically applicable to the inventory systems where a single supplier is responsible for supplying a number of items and to the batch processing industry where a product must be packaged into several container sizes immediately after manufacture.

ISSN:0020-7543    

DOI:10.1080/00207547408919588

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper presents the derivation of formulae for estimating fraction defective for a process from either continuous production or discrete lots. The estimators derived are the best linear unbiased estimators (BLUE). Also presented are the variances of the estimators.

ISSN:0020-7543    

DOI:10.1080/00207547408919589

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor