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This paper reviews a wide variety of manpower and personnel models of the goal programming variety. This is done from a strategy-oriented point of view addressing the problems of interest for immediate implementation as well as basic problems of manpower model research development. Particular emphasis in this paper is concerned with how analytical models can be brought to bear on the problems of combining military and civilian manpower into one management system. This includes a discussion of the computer support arrangements necessary to implement the models. First, we discuss an extension of multilevel models to provide an integrated approach to program planning which includes the dynamics of the manpower requirements-inventory relationships of mixed military-civilian manpower systems. Then, focus is given to some of the potential Navy applications particularly in terms of ways the outputs from the global multilevel model might be interfaced with assignment models for operational planning. The paper concludes with a discussion of static and dynamic multiattribute assignment models which operate on the individual man-job matching level. It is at this level of detail that dynamic mixed manpower systems might be constructed for use in equal employment opportunity planning and for local organization design studies. 相似文献
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The standard problem in sampling inspection is to consider plans with and without curtailment. Curtailment causes difficulty and authors rarely give exact results (i.e., exact OC and ASN functions) for curtailed procedures. In this article we regard curtailment as an inverse sampling procedure and use Dirichlet integrals to obtain exact formulas for the OC, the ASN, and also the variance of the number of observations required under three types of plans: no curtailment, semicurtailment (for rejection only) and two-sided curtailment. Different sections of the article deal with the single sample, the two-stage, and the multiple-stage sampling problems. New tables for carrying out the single-sample procedure are included in the article. The authors feel that this article presents new directions and new ways of dealing with problems associated with quality control. 相似文献
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The discrete failure rate model that has a change point is considered. A strongly consistent estimator for the change point is obtained. This produces consistent estimators for the failure rate and survival functions that converge uniformly with probability 1. © 1994 John Wiley & Sons, Inc. 相似文献
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We propose a nonparametric Bayesian lifetime data analysis method using the Dirichlet process mixture model with a lognormal kernel. A simulation‐based algorithm that implements the Gibbs sampling is developed to fit the Dirichlet process lognormal mixture (DPLNM) model using rightly censored failure time data. Five examples are used to illustrate the proposed method, and the DPLNM model is compared to the Dirichlet process Weibull mixture (DPWM) model. Results indicate that the DPLNM model is capable of estimating different lifetime distributions. The DPLNM model outperforms the DPWM model in all the examples, and the DPLNM model shows promising potential to be applied to analyze failure time data when an appropriate parametric model for the data cannot be specified. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013 相似文献
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The class of functions expressed as linear (not necessarily convex) combinations of negative exponential functions is dense in the set of all square integrable functions on the nonnegative reals. Because of this and resultant mathematical properties, linear combinations of exponential densities have excellent potential for wide application in stochastic modeling. This work documents the development and testing of a practical procedure for maximum-likelihood estimation for these generalized exponential mixtures. The algorithm offered for the problem is of the Jacobi type and guarantees that the result will provide a legitimate probability function of the prescribed type. Extensive testing has been performed and results are very favorable: convergence is rapid and the use of computer resources rather limited. 相似文献
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Mixed integer programming problems arising in practice often contain special structures such as imbedded networks and multiple choice constraints. Easily derived inequalities are given that can be used to reduce the range of admissible solutions for such problems. 相似文献
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A population of items which break down at random times and require repair is studied (the classic “machine repair problem with spares”). It is desired to determine the number of repair channels and spares required over a multiyear planning horizon in which population size and component reliability varies, and a service level constraint is imposed. When an item fails, a spare (if available) is immediately dispatched to replace the failed item. The failed item is removed, transported to the repair depot, repaired, and then placed in the spares pool (which is constrained to be empty not more than 10% of the time) unless there is a backlog of requests for spares, in which case it is dispatched immediately. The first model considered treats removal, transportation, and repair as one service operation. The second model is a series queue which allows for the separate treatment of removal, transportation, and repair. Breakdowns are assumed Poisson and repair times exponential. 相似文献
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张志华 《海军工程大学学报》1990,(3)
本文以二参数(三参数)Gamma 分布的极大似然估计为基础构造出其参数的Bootstrap 估计(简记 MLBE 估计),同时证明了这种估计在大样本情况下是相合的。通过计算机模拟表明:MLBE 估计在小样本下比 MLE 估计更有效,特别是 MLBE 估计能很好地解决三参数 Gamma 分布的区间估计问题。 相似文献
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距离连接在空间数据库中有着广泛的应用,而距离连接的选择度估计是优化距离查询的基础。通过综合分析和比较了现有的选择度估计技术,提出了一种利用米诃夫斯基和与直方图进行距离连接选择度估计的新方法。实验结果证明该种方法能够有效地进行距离连接选择度估计。 相似文献
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Satya D. Dubey 《海军后勤学研究》1971,18(4):561-566
It is pointed out in this paper that Lomax's hyperbolic function is a special case of both Compound Gamma and Compound Weibull distributions, and both of these distributions provide better models for Lomax's business failure data than his hyperbolic and exponential functions. Since his exponential function fails to yield a valid distribution function, a necessary condition is established to remedy this drawback. In the light of this result, his exponential function is modified in several ways. It is further shown that a natural complement of Lomax's exponential function does not suffer from this drawback. 相似文献
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Adequate prediction of a response variable using a multiple linear regression model is shown in this article to be related to the presence of multicollinearities among the predictor variables. If strong multicollinearities are present in the data, this information can be used to determine when prediction is likely to be accurate. A region of prediction, R, is proposed as a guide for prediction purposes. This region is related to a prediction interval when the matrix of predictor variables is of full column rank, but it can also be used when the sample is undersized. The Gorman-Toman ten-variable data is used to illustrate the effectiveness of the region R. 相似文献
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研究了二维谐波信号相关矩阵后 ,提出了一种称之为“矩阵束的二维谐波估计 (MP2D)”算法 ,该算法既不需要求解二维特征多项式的根 ,也不需要在二维频率空间搜索谱峰 ,算法具有高效性。仿真实验表明 ,该算法在白噪声条件下对二维谐波频率估计具有高的精度和强的抗干扰能力。 相似文献
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针对双经纬仪异面交会中目标点并不一定正好在公垂线上的问题,提出了在公垂线附近的空间区域上估计目标点位置的方法。该空间区域为以公垂线为对角线,各边分别平行于双经纬仪测量坐标系三轴的长方体空间区域。在目标点位置估计时考虑到经纬仪高低角与水平角测角精度的不同,以及目标点与经纬仪之间距离对空间点坐标精度的影响。采用蒙特卡洛方法模拟结果表明:新方法的目标点空间位置估计精度不亚于传统公垂线法,在特定情况下甚至能提高5%以上。模拟结果验证了新方法的可行性和有效性。 相似文献
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针对系统误差变化规律未知时的传感器探测系统偏差估计问题,提出了一种改进的基于Mean-Shift(均值偏移)的传感器动态偏差估计算法.该算法利用Mean-Shift方法对不同样本点对估计结果贡献不同的特点,根据样本点偏离均值的偏移量以及偏移时间构建权系数.仿真结果表明,该方法在系统误差变化规律未知的情况下,可有效估计多... 相似文献
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为了精确估计移动目标方位角,通过用遗传算法对均匀圆阵进行目标的估计,引入确定性最大似然准则确定遗传算法中的适应度函数,并利用模式空间变换方法将均匀圆阵转换为虚拟线阵;列出了遗传算法基本步骤.通过计算机仿真对遗传算法与MUSIC算法以及遗传算法迭代次数与信噪比的关系进行了比较,验证了在低信噪比的情况下有很好的收敛性和稳定性. 相似文献
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后向投影 (BP)算法是一种被广泛应用于冲激SAR的成像算法。当冲激SAR的发射信号是某一类冲激信号时 ,根据冲激SAR成像的特点 ,推导出BP算法的方位分辨率与成像积累角、信号中心频率的关系。仿真结果表明 ,在相当范围内 ,估计公式都是准确的 相似文献