摘要:

AbstractThis article considers the dynamic lot‐size problem under discounting, allowing speculative motive for holding inventory. A variable rolling‐horizon procedure is presented, which, under certain regularity conditions, is guaranteed to generate an infinite‐horizon optimal‐production plan. We also discuss a fixed rolling‐horizon procedure which provides a production plan that achieves an infinite‐horizon cost within a user‐specified tolerance ϵ of optimality. The fixed‐horizon lengthT* needed in this procedure is given in terms of a closed‐form formula that is independent of specific forecasted demands. We also present computational results for problems with a range of cost parameters and dema

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<761::AID-NAV3220340602>3.0.CO;2-X

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractA method previously devised for the solution of thep‐center problem on a network has now been extended to solve the analogous minimax location‐allocation problem in continuous space. The essence of the method is that we choose a subset of thenpoints to be served and consider the circles based on one, two, or three points. Using a set‐covering algorithm we find a set ofpsuch circles which cover the points in the relaxed problem (the one withm

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<775::AID-NAV3220340603>3.0.CO;2-N

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractIn this article we study the properties of the optimal Bayesian single‐sampling plans when the prior distribution of the lot fraction defective is modified Beta, which has been found useful in the analysis of inspection schemes for complex production systems. These properties are used to devise an improved and more efficient algorithm for the determination of the optimal sampling plans. Numerical examples are presented to illustrate the potential computational savings of the algorith

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<789::AID-NAV3220340604>3.0.CO;2-D

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractWe consider scheduling a set of jobs on parallel processors, when all jobs have a common due date and earliness and lateness are penalized at different cost rates. For identical processors, the secondary criteria of minimizing makespan and machine occupancy are addressed. The extension to different, uniform processors is also solved.

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<803::AID-NAV3220340605>3.0.CO;2-2

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe transfer‐line models in the literature are planning models rather than operational models. That is, they are very useful for planning or designing the transfer line, but are less useful for controlling the daily operation of the line. The performance measure used in these models is the efficiency of the line A. The expected number of units produced during a period of lengthTcycles isAT. In this article a procedure is presented for calculating the variance of the number of units produced by the transfer line during a period of lengthTcycles. These two performance measures can be used to construct an interval estimate for, say, the number of units produced during a shift. This interval estimate is an operational guide for the production manage

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<811::AID-NAV3220340606>3.0.CO;2-Z

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractNew partial orderings of life distributions are given. The concepts of decreasing mean residual life, new better than used in expectation, harmonic new better than used in expectation, new better than used in failure rate, and new better than used in failure rate average are generalized, so as to compare the aging properties of two arbitrary life distributions.

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<823::AID-NAV3220340607>3.0.CO;2-R

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractLeadtime uncertainty occurs in both manufacturing and distribution systems and can cause difficult coordination problems. We analyze a simple three‐location, two‐level distribution‐type system with stochastic leadtimes with the objective of determining planned leadtimes which minimize the sum of expected inventory‐holding and tardiness costs. In a manufacturing context, the system can be viewed as one in which common processing or procurement is done first, whereupon another manufacturing stage differentiates this common product. Within a distribution framework, the system is one in which material is transported to a central facility (such as a regional warehouse) and subsequently transported to smaller local distributors or retailers. We investigate two heuristic policies which are simple adjustments to optimal solutions for serial systems resulting from a decoupling of the distribution network. We also report computational experience which indicates that the optimal “location” and quantity of safety time depends largely upon the relationship among the due dates and average leadtimes for the final stages of processing

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<831::AID-NAV3220340608>3.0.CO;2-N

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe confidence coefficient of a two‐sided confidence interval for the binomial parameterpis the infimum of the coverage probability of the interval aspranges between 0 and 1. The confidence coefficients for five different approximate confidence intervals are computed and compared to the confidence coefficient for the two‐sided Clopper‐Pearson confidence interval. Pratt's approximation method [10] yields virtually the same confidence coefficients as the Clopper‐Pearson interval, and is easily computed without resorting to interative

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<845::AID-NAV3220340609>3.0.CO;2-D

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe article examines ways of computing cumulative probabilities for a constrained Poissonian binomial distribution arising from a model of a weapon defense system.

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<853::AID-NAV3220340610>3.0.CO;2-1

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractTwo new randomization tests are introduced for ordinal contingency tables for testing independence against strictly positive quadrant dependence, i.e.,P(X>x,Y>y) ≥P(X>x)P(Y>y) for allx,ywith strict inequality for somexandy. For a number of cases, simulation is used to compare the estimated power of these tests versus those standard tests based on Kendall'sT, Spearman'sp, Pearson'sX2, the usual likelihood ratio test, and a test based upon the log‐odds ratio. In these cases, subsets of the alternative region are identified where each of the testing statistics is superior. The new tests are found to be more powerful than the standard tests over a broad range of the alternative regions for these ca

ISSN:0894-069X    

DOI:10.1002/1520-6750(198712)34:6<859::AID-NAV3220340611>3.0.CO;2-T

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY