摘要:

In this paper we present an interactive optimization procedure for a mixed disc packing problem. The procedure is based on the bounds on the area left uncovered by the circular disks when packed on the circular plate (developed in Part I) and is implemented on a computer graphics terminal. The proposed procedure is applied to problems involving two and three types of discs and results are presented.

ISSN:0740-817X    

DOI:10.1080/05695558308974618

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper extends the fundamental concepts developed for price-adjusted single sampling with quadratic indifference to sampling with polynomial indifference. The rationale of using indifference curves described by polynomial functions and a method of determining such functions are given. Modifications to the existing solution procedure are also discussed. As a result, a simple but general computational procedure is formulated for the determination of sampling plans which provide probabilistic protections to both the producer and consumer. These results widen the range of flexibility in the application of price-adjusted sampling.

ISSN:0740-817X    

DOI:10.1080/05695558308974619

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Methods are developed for determining minimum sample size in simple linear regression (when residuals are nonnormal) that permit use of the classical normality-based analyses. The methods are based on behavior of standardized third and fourth moments of regression estimators. The case of symmetric independent variable values with one observation at each is considered. All other regression assumptions are assumed to be true.

ISSN:0740-817X    

DOI:10.1080/05695558308974620

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

All aggregate planning models, except two, utilize a constant productivity factor throughout the planning horizon. The two models which allow changing productivity factors have limitations and unrealistic assumptions. This article incorporates into an aggregate planning model the effects of manpower-level transactions on productivity.

ISSN:0740-817X    

DOI:10.1080/05695558308974621

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Cycle counting is a recently devised procedure for continuously updating inventory record accuracy as a replacement for an annual complete inventory count. Cycle counting has been shown to provide greater inventory record accuracy for financial control and for production planning and purchasing operations. However, cycle counting procedures have used an arbitrary basis for classifying inventoried items and for setting the count frequency within each class. In this paper, cycle counting is characterized as stratified statistical sampling. Procedures are shown for maintaining the statistical accuracy required for financial control while reducing the amount of sampling and counting costs. Other criteria can be similarly used. These procedures include the Tschuprow-Neyman optimum allocation rule, the Dalenius-Hodges strata identification rule, a search for an optimum number of strata and improvements in the cycle counting procedures and crew size toward an optimum level: compatible methodologies. A numerical example of typical industrial conditions is provided to show perspective improvements using the optimal stratified cycle counting system in contrast to current cycle counting practices.

ISSN:0740-817X    

DOI:10.1080/05695558308974622

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An important problem in reliability theory is to determine the reliability of a complex system given the reliabilities of its components. In real life, the system and its components can be found in a range of states varying from perfect functioning through various levels of performance degradation to complete failure. This paper presents some models and their applications, in terms of reliability analyses, to situations where the system can have a whole range of states and all its components can also have a wide range of multiple states. Properties of the system structure function and computation and approximation of system state probabilities and system reliability measures are given.

ISSN:0740-817X    

DOI:10.1080/05695558308974623

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The column generation algorithm for the multi-item lot-size scheduling problem under resource constraints is examined and improved upon by augmenting simpler heuristic routines in place of the time-consuming Wagner-Whitin dynamic programming routine. The heuristic algorithms thus developed are tested by controlling problem size, setup time, demand variability, and capacity change costs in test problems. The empirical results indicate that the proposed heuristic algorithms reduce CPU time as well as the number of iterations with only a slight loss in optimality.

ISSN:0740-817X    

DOI:10.1080/05695558308974624

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

When attributes of experimental units serve as independent variables, locating the units possessing the required combinations of attribute values for an experimental design can be a serious practical problem. Often, however, data sets of observable experimental units exist. A computer-aided design methodology is presented which determines which two-level factorial and orthogonal fractional factorial designs are feasible, given the data set of observable experimental units. Contrary to usual practice, the number of factors to consider is an explicit experiment planning variable in the methodology. All combinations of ten and fewer factors and 210and fewer observations (in steps of powers of 2) are represented by a feasibility matrix. For a given set of observable experimental units, the design methodology attempts to map which cells of the matrix are feasible. Dependency relationships among feasibility matrix cells are stated which allow implicit enumeration of cells. An example taken from highway safety research is used to demonstrate use of the design methodology. Lastly, search times for random data sets indicate seven or fewer factors can be searched at low cost, but the cost for more than seven factors is dependent upon data-set size.

ISSN:0740-817X    

DOI:10.1080/05695558308974625

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Traditionally, consumers pay a fixed price for a quantity of items based on a presumed mean life. In many cases (i.e., federal government procurement) a sample of items is pretested to determine mean life and hence conformance to the contract. This paper suggests an alternative scheme based on a price indifference curve h(φ) which specifies the unit cost given mean life φ, which is estimated based on the actual performance of the firstritems that fail. The paper develops a specific form for the indifference function and a procedure for estimating both φ andh(φ) and presents an example.

ISSN:0740-817X    

DOI:10.1080/05695558308974626

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper investigates the replacement strategy in which aging equipment is completely rejuvenated (through replacement or overhaul) when its service age reaches a certain critical level. The equipment is also partially rejuvenated (through repair) following a random breakdown, in which case its service age is brought to a level which is a constant fraction of its service age justprior to breakdown. This results in a repair discipline which is between the previously studied cases of minimal repair and major repair. The optimal replacement policy which minimizes the total expected discounted cost, including cost of replacement, cost of repair, and cost of operation, is examined.

ISSN:0740-817X    

DOI:10.1080/05695558308974627

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor