破片侵彻多层间隔铝靶的试验及数值模拟研究

对破片侵彻多层间隔铝靶进行了试验和数值模拟研究,获得了破片在不同速度、不同侵彻角时破片的侵彻深度,在此基础上利用拟合的方式建立了计算公式,并将数值模拟结果和计算公式的计算结果进行了对比,结果表明两者吻合较好,所建立的计算公式可靠。     

The impact of demand uncertainty on product line design under endogenous substitution

The existing product line design literature devotes little attention to the effect of demand uncertainty. Due to demand uncertainty, the supply‐demand mismatch is inevitable which leads to different degrees of lost sales depending on the configuration of product lines. In this article, we adopt a stylized two‐segment setup with uncertain market sizes and illustrate the interplay between two effects: risk pooling that mitigates the impact of demand uncertainty and market segmentation that facilitates consumer differentiation. Compared to downward substitution, inducing bidirectional substitution through product line decisions including quality levels and prices can yield greater risk pooling effects. However, we show that the additional benefit from the risk pooling effect cannot compensate for the reduced market segmentation effect. We demonstrate that the presence of demand uncertainty can reduce the benefit of market segmentation and therefore the length of product lines in terms of the difference between products. We also propose three heuristics that separate product line and production decisions; each of these heuristics corresponds to one particular form of demand substitution. Our numerical studies indicate that the best of the three heuristics yields performance that is close to optimality. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 143–157, 2015     

From Civil War Victor to Cold War Guard: Positional Warfare in Korea and the Transformation of the Chinese People’s Liberation Army, 1951–1953

This article analyses the impact of the Korean War on the Chinese People’s Liberation Army (PLA), particularly the period of positional warfare from 1951 to 1953. In the war of movement between October 1950 and June 1951, the PLA relied on its civil war era weapons and experience, including the doctrine of ‘battle of annihilation’. Operations in early 1951 suggested that the civil war legacies of the PLA no longer applied to the realities of combat in Korea. Based on both Soviet aid and domestic mobilisation, the PLA managed to build the material foundation for positional warfare and rapidly improved its logistics. Operationally, on the defensive, the PLA developed combined operations integrating infantry, artillery, and armoured forces. The PLA learned the lessons of the Korean War and strengthened its ties with the Soviet armed forces in order to modernise itself. The Korean War thus transformed the PLA from Civil War victor to Cold War guard.     

Optimal pricing and scheduling control of product shipping

In this article, we seek to understand how a capacity‐constrained seller optimally prices and schedules product shipping to customers who are heterogeneous on willingness to pay (WTP) and willingness to wait (WTW). The capacity‐constrained seller does not observe each customer's WTP and WTW and knows only the aggregate distributions of WTP and WTW. The seller's problem is modeled as an M/M/N_s queueing model with multiclass customers and multidimensional information screening. We contribute to the literature by providing an optimal and efficient algorithm. Furthermore, we numerically find that customers with a larger waiting cost enjoys a higher scheduling priority, but customers with higher valuation do not necessarily get a higher scheduling priority. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 215–227, 2015     

一种10kA零磁通霍尔电流传感器的设计与仿真

采用线圈分段绕制的方法,设计了一种10kA量程的零磁通霍尔电流传感器以及相应的驱动电路,有效地将驱动电压降为±15V,并利用电磁场仿真验证了线圈分段设计的可行性。同时,提出了铁芯线圈以及霍尔元件的等效电路仿真方法,并以此为基础在Multisim中搭建了零磁通霍尔传感器系统的电路仿真模型,通过对各种电流波形进行仿真验证,证明了该设计的合理性。     

针对应急救援路径规划的一种改进蚁群算法

针对不返回起始点、多个待救援点的应急救援路径规划问题,提出了一种应急救援路径规划的改进蚁群算法,设计了一种新的路径构造方法,为蚁群算法求解该类问题打下了基础。为提高收敛性,改进了信息素更新规则,构造了一种与蚁群算法有效结合的局部搜索算法,提高了算法快速寻优的能力。仿真结果表明:改进蚁群算法能够快速找到一条从救援中心到多个待救援点的优化路径,且收敛速度和最短路径较同类算法更优。     

雷达目标高分辨距离像的特征提取及识别方法

本文首先应用ＴＬＳ－ＥＳＰＲＩＴ算法提取光学区高分辨雷达目标散射中心位置信息,并提出了“基于散射中心位置的相关匹配”目标识别算法,而后,证明了该算法相关匹配系数与所选择的基底无关以及算法的稳定性问题。最后,给出了五种飞机缩比模型的实验结果。     

滑阀副配磨参数微机控制测量系统的研究

本文论述了滑阀副配磨参数的测量原理,提出了微机控制的滑阀副配磨参数测量系统,介绍了系统的硬件与软件设计,给出了测量系统的实验结果,并对测量系统进行了误差分析,最后得出几点结论。     

FORTRAN 程序的多任务分割

本文以数据相关分析为基础,详细地讨论了LOOP级多任务生成的几种方法,给出了FORTRAN循环可并行执行的条件,提出了需要注意的几个问题。在此基础上,本文提出了对FORTRAN 程序进行宏任务生成的一种新方法,并且考虑了实现多任务生成的几个编译问题。     

能量传递在弹丸致伤效应中的研究

为了寻求一种量化的方法,更好地评估轻武器对肌体的致伤效能,根据肌体特性,以经典外弹道理论[1]和创伤弹道学理论[2]为依据,建立弹丸在肌体组织内的运动模型。利用脉冲X射线照相得到相关实验数据,运用Matlab软件对弹丸运动模型进行编程[3],计算出弹丸侵彻距枪口某距离处肌体靶标后,在肌体内的速度变化规律,从而计算出弹丸传递给人体能量的大小,再以此为依据快速评价出弹丸的致伤效能。