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281.
Wilbert E. Wilhelm 《海军后勤学研究》1987,34(5):721-738
This article develops a structure by which the computational complexity of sequencing problems in assembly cells attended by one or two robots may be evaluated. A taxonomy of cell features that affect complexity is developed, polynomial-time algorithms are presented for certain problems, and borderline designs at which complexity changes dramatically are identified. Results will aid cell designers by indicating classes of designs for which task sequence may be optimized and other classes for which this cannot be done. Designs which entail features that lead to intractable sequencing problems may be modified to maximize cell productivity. 相似文献
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After first formulating the problem of the Marine Environmental Protection program of the Coast Guard as a multiple-objective linear program, we investigate the applicability and limitations of goal programming. We point out how the preemptive goal-programming approach is incompatible with utility preferences. Then we observe the tendency of optimal solutions for standard linear goal programs to occur at extreme points. We also note problems of more general approaches, such as dealing with additively separable approximations to preferences. 相似文献
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Moment estimators for the parameters of the Weibull distribution are considered in the context of analysis of field data. The data available are aggregated, with individual failure times not recorded. In this case, the complexity of the likelihood function argues against the use of maximum-likelihood estimation, particularly for relatively large sets of data, and moment estimators are a reasonable alternative. In this article, we derive the asymptotic covariance matrix of the moment estimators, and provide listings for BASIC computer programs which generate tables useful for calculation of the estimates as well as for estimating the asymptotic covariance matrix using aggregated data. 相似文献
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Lawrence E. Cline 《Defense & Security Analysis》2019,35(3):241-260
Most counterinsurgency campaigns have featured the use of some form of local defense forces. Such forces have had a somewhat mixed record, both in their usefulness in actually countering insurgents and in their longer-term impact on internal security. This article focuses on historical cases that provide lessons for the best operational and strategic uses of local defense forces and measures to control their activities. 相似文献