Interactive solution of bi-criteria mathematical programs

In this paper, we develop efficient interactive methods for the solution of bicriteria nonlinear programming problems. The methods do not require trade-off information from the decision maker, pose less cognitive burden and converge to the “best compromise solution” fast. Two methods, called the paired comparison method and comparative trade-off method, are presented with examples. A real application of the interactive method to a bicriteria problem that arose in the planning of the cardiovascular disease control program in the U.S. Air Force is also presented.     

Another inventory model with a mixture of backorders and lost sales

This article presents another inventory model for situations in which, during the stockout period, a fraction b of the demand is backordered and the remaining fraction 1 ? b is lost. By defining a time-proportional backorder cost and a fixed penalty cost per unit lost, a unimodal objective function representing the average annual cost of operating the inventory system is obtained. The optimal operating policy variables are calculated directly.     

Optimal maintenance models for systems subject to failure–A Review

This paper is a state-of-the-art review of the literature related to optimal maintenance models of systems subject to failure. The emphasis is on work appearing since the 1976 survey, “A Survey of Maintenance Models: The Control and Surveillance of Deteriorating Systems,” by W.P. Pierskalla and J.A. Voelker, published in this journal.     

坦克柴油机比油耗实车测试的研究

针对实车检测坦克柴油机比油耗的原理和方法作了探讨,对12150L柴油机进行了实车比油耗测试,认为用无负荷方法实车测定柴油机有效功率,同时用涡轮流量计测量燃油消耗量是实车测量发动机比油耗可行的方法。     

紊流火焰生长的现象学模型

提出了一个紊流火焰生长的现象学模型,将预混合燃烧紊流火焰的生长过程与火焰瞬时尺度和基本的紊流特性参数联系起来,描述了火焰从层流传播到充分发展的紊流传播的全过程。计算结果与测量数据的比较显示了较好的一致性。     

燃烧驱动连续波DF化学激光器的输出光谱

利用光栅扫描记录方法测量了不同气流参数条件下,某燃烧驱动连续波ＤＦ化学激光器的输出光谱,将测量结果和数值计算结果进行了比较和分析。     

无人战斗机技术要素研究

无人战斗机作为介于有人战斗机和巡航导弹之间的一种新型武器系统,将在未来空战中发挥重大作用。主要对目前存在的无人战斗机（ＵＣＡＶ）概念进行了讨论,分析了无人战斗机的基本性能和技术要素,提出了未来无人战斗机的发展趋势。     

多鱼雷攻击多目标的可攻性判据及占位参数优化

本文建立了一套系统解决单艇用多鱼雷攻击多目标的可攻击判据和求解对应优化占位参数的方法。本文的研究中采用了独特的分析坐标系,这样在解决和建立可攻击判据的问题上,不仅避免了繁杂的数值计算,还给出了完备的解析解形式及系统化的概念。所得结论对发展现代潜艇鱼雷攻击战术和实现作战决策科学化具有一定的学术价值和实用意义。     

Approximate probability distributions for the extreme spread

The extreme spread, or greatest distance between all pairs of impact points on a target, is often used as a rapid measure of dispersion or precision of shot groups on a target. It is therefore desirable to know its statistical properties. Since the exact theoretical distribution has not yet been worked out, this paper examines the accuracy of several approximations which are checked against large sample monte carlo values. We find in particular that for the sample sizes considered the extreme spread can be approximated well by a Chi variate.     

Lower confidence limits for the impact probability within a circle in the normal case

Lower confidence limits are derived for the impact probability within a circle of fixed radius. The bivariate normal distribution with zero means, unequal variances, and zero correlation is the probability model for impacts. A new representation of the impact probability function is offered. This presentation is valid also for the dependent case, where the eigenvalues of the covariance matrix replace the variances. When the ratio of variances is known the lower confidence limits are uniformly most accurate (UMA). A few alternative approaches are compared by simulation when the ratio of variances is unknown.