基于多层循环并行化的负载平衡优化

负载平衡是并行处理中的一个重要概念。参与一个程序执行的各处理机所承担的工作量是否均衡直接影响该程序的并行性能。本文对面向MPP系统程序循环级并行化中负载平衡的优化进行了探讨,提出了优化策略及其实施算法。     

解析方法与数值模拟相结合求解炸药在容器内部爆炸产生的壁面载荷

本文采用总变差递减（TVD）数值方法与强爆炸解析解相结合的手段,求解了炸药在爆炸容器内部产生的作用载荷。计算结果与实验值在几个典型位置进行了比较,二者有良好的符合。与单纯的数值方法相比,本文所探索的方法能有效地克服对称轴附近的数值振荡,不失为确定爆炸载荷的一种新途径。     

拉压异性材料厚壁圆筒和厚壁球壳的极限载荷分析

本文利用库仑屈服准则,研究了拉压异性材料厚壁圆筒和厚壁球壳的弹性极限载荷和塑性极限载荷,得出了新的结果和结论。计算结果表明,考虑了材料的拉压异性之后,厚壁圆筒和厚壁球壳的极限载荷均有明显提高。     

一种确定载荷识别分析频带宽度的方法

本文研究在载荷识别中确定载荷的分析处理频带宽度的方法。提出将载荷95％的能量对应的频率f_0,作为分析处理带宽。该方法具有一般性。     

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。     

Contrasting the Impacts of Combat and Humanitarian Assistance/Disaster Relief Missions on the Mental Health of Military Service Members

Abstract

We study the differential impacts of combat and humanitarian assistance/disaster relief (HA/DR) missions on the mental health of U.S. Marine Corps members. The deployment experiences of any individual Marine are plausibly random conditional on the observable characteristics which are used to assign Marines into units. Leveraging this exogenous variation, we compare the incidence of post-traumatic stress disorder (PTSD) and suicide deaths among Marines who deployed to either Operation Enduring Freedom/Operation Iraqi Freedom (OEF/OIF) or HA/DR missions between 2001 and 2011. We find that the hazard of PTSD is close to eight times higher among Marines returning from OEF/OIF compared to those never deployed, and just 1.33 times higher among those returning from HA/DR (and never participated in OEF/OIF). Those returning from OEF/OIF missions are 1.81 times more likely than those never deployed to die by suicide when they were still active duty, and the hazard increases to almost 3 after they have left the military. In contrast, we find no difference in the hazards of suicide death between those that deployed to only HA/DR missions and non-deployed Marines.     

Models for production planning under power interruptions

We present a robust optimization model for production planning under the assumption that electricity supply is subject to uncertain interruptions caused by participation in interruptible load contracts (ILCs). The objective is to minimize the cost of electricity used for production while providing a robust production plan which ensures demand satisfaction under all possible interruption scenarios. The combinatorial size of the set of interruption scenarios makes this a challenging problem. Furthermore, we assume that no probabilistic information is known about the supply uncertainty: we only use the information given in the ILC to identify an uncertainty set that captures the possible scenarios. We construct a general robust framework to handle this uncertainty and present a heuristic to compute a good feasible solution of the robust model. We provide computational experiments on a real‐world example and compare the performance of an exact solver applied to the robust model with that of the heuristic procedure. Finally, we include the operational impact of interruptions such as “recovery modes” in the definition of the uncertainty set. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

摆动喷管控制精度相关问题讨论

对不同性质的喷管特点以及在控制力作用下喷管的响应特性进行了初步分析;以某防空导弹为例,阐述了摆动喷管在非理想状态下摆动时作动器牵连运动、正负摆角不对称、力臂变化、摆心漂移、位移传递系数精度和预调角对摆角控制的影响;同时说明了负载力矩和伺服机构相关参数影响着摆动喷管位置控制精度。     

卫星导航干扰源优化部署方法

现代要地防空作战中,卫星导航对抗作为一种新兴的电子对抗形式,在战争中发挥重要作用,而卫星导航干扰力量的部署方案决定其能否有效实现对任务区域的覆盖,取得理想的干扰效果。通过分析卫星导航压制式干扰的作战机理,选取任务区域覆盖率和平均危险指数作为衡量特定部署方案下卫星导航干扰力量的作战效能指标,建立多目标组合优化模型,并运用遗传算法进行求解,得到优化的部署方案。通过仿真分析,表明该模型能够快速有效地产生卫星导航干扰源的优化部署方案,为指挥员辅助决策提供参考。     

改进的混合蛙跳算法在雷达网部署中的应用

针对雷达组网优化部署的原则,建立了区域雷达组网优化部署的数学模型,提出了一种基于改进的蛙跳算法的雷达组网优化部署方法。在阐述了改进方法的基础上,与先前方法进行了对比分析。最后,通过计算机仿真试验进行了验证,结果表明:改进的混合蛙跳算法能够快速得到多种优化部署方案,且操作性强,能较好地应用于雷达组网优化。