摘要:

AbstractThe effectiveness of Johnson's Approximate Method (JAM) for the 3 ×njob shop scheduling problems was examined on 1,500 test cases withnranging from 6 to 50 and with the processing timesAi,Bi,Ci(for itemion machinesA, B, C) being uniformly and normally distributed. JAM proved to be quite effective for the caseBi⩽ max (Ai,Ci) and optimal forBi, ⩽ min (Ai

ISSN:0028-1441    

DOI:10.1002/nav.3800240112

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

年代:1977

数据来源: WILEY

摘要:

AbstractA flow shop sequencing problem with ordered processing time matrices is considered. A convex property for the makespan sequences of such problems is discussed. On the basis of this property an efficient optimizing algorithm is presented. Although the proof of optimality has not been developed, several hundred problems were solved optimally with this procedure.

ISSN:0028-1441    

DOI:10.1002/nav.3800240113

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

年代:1977

数据来源: WILEY

摘要:

AbstractA deterministic resource allocation model is developed to optimize defense effectiveness subject to budget, manpower, and risk constraints. The model consists of two major submodels connected by a heuristic. The first is a mathematical program which optimizes the multiperiod weapon mix subject to the constraint set. The second is a manpower supply model based on a transition matrix in which individual transitions are functions of personnel related budgets and historical transition rates. The heuristic marries the submodels through an iterative process leading to improved solutions. An example is provided which demonstrates how systems are undercosted and overprocured if manpower supply is not properly reflected relative to manpower demand.

ISSN:0028-1441    

DOI:10.1002/nav.3800240114

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

年代:1977

数据来源: WILEY

摘要:

AbstractAn approximation suggested in Mann, Schafer and Singpurwalla [18] for obtaining small‐sample tolerance bounds based on possibly censored two‐parameter Weibull and lognormal samples is investigated. The tolerance bounds obtained are those that effectively make most efficient use of sample data. Values based on the approximation are compared with some available exact values and shown to be in surprisingly good agreement, even in certain cases in which sample sizes are very small or censoring is extensive. Ranges over which error in the approximation is less than about 1 or 2 percent are determined. The investigation of the precision of the approximation extends results of Lawless [8], who considered large‐sample maximum‐likelihood estimates of parameters as the basis for approximate 95 percent Weibull tolerance bounds obtained by the general approach described in [18]. For Weibull (or extreme‐value) data the approximation is particularly useful when sample sizes are moderately large (more than 25), but not large enough (well over 100 for severely censored data) for asymptotic normality of estimators to apply. For such cases simplified efficient linear estimates or maximum‐likelihood estimates may be used to obtain the approximate tolerance bounds. For lognormal censored data, best linear unbiased estimates may be used, or any efficient unbiased estimators for which variances and covariances are known as functions of the square of the distributi

ISSN:0028-1441    

DOI:10.1002/nav.3800240115

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

年代:1977

数据来源: WILEY

摘要:

AbstractAn exact confidence interval for an interclass mean, that is, the mean of a composite sample made up several subsamples of unequal sizesni, is presented.

ISSN:0028-1441    

DOI:10.1002/nav.3800240116

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

年代:1977

数据来源: WILEY

ISSN:0028-1441    

DOI:10.1002/nav.3800240101

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

年代:1977

数据来源: WILEY