一种三维小基阵无源声测定向算法

无源声测定向是声学监视技术的重要研究内容。为了实现对低空运动目标的声学监视,提出了一种小基阵定向方法,并用线性回归分析原理导出了定向算法,对定向误差进行了理论分析和数值仿真。不仅适用于随机布阵的三维小基阵情况,也可应用到二维小基阵对声源的定向。理论分析和仿真表明,这种定向算法正确可行,且有较大的实用价值。     

Quantity discount pricing policies for heterogeneous retailers with price sensitive demand

Although quantity discount policies have been extensively analyzed, they are not well understood when there are many different buyers. This is especially the case when buyers face price‐sensitive demand. In this paper we study a supplier's optimal quantity discount policy for a group of independent and heterogeneous retailers, when each retailer faces a demand that is a decreasing function of its retail price. The problem is analyzed as a Stackelberg game whereby the supplier acts as the leader and buyers act as followers. We show that a common quantity discount policy that is designed according to buyers' individual cost and demand structures and their rational economic behavior is able to significantly stimulate demand, improve channel efficiency, and substantially increase profits for both the supplier and buyers. Furthermore, we show that the selection of all‐units or incremental quantity discount policies has no effect on the benefits that can be obtained from quantity discounts. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005     

小口径火炮侵彻钢靶模拟实验研究及有限元分析

对小口径火炮侵彻钢靶问题,分别进行了实验和有限元分析,并将所得结果进行了比较;分析了小口径火炮侵彻钢靶的侵彻过程,得到了带空腔弹丸高速垂直侵彻钢板的典型破坏模式.     

低空复杂场景红外弱小目标快速精准检测

针对低空复杂场景下红外弱小动目标检测难度大、虚警率高等问题,面向探测系统中高帧频图像实时处理应用需求,提出基于全卷积网络的弱小目标精准检测方法和基于现场可编程逻辑门阵列(field programmable gate array, FPGA)的低时延并行处理方法。采用轻量化全卷积网络对红外图像中弱小目标进行空域检测,对相邻图像帧疑似目标进行时域轨迹关联以进一步降低虚警率。实验结果表明:上述方法相比于五种传统方法在检测率和虚警率性能方面均有显著提升,并在单片FPGA上完成100 Hz图像实时处理,处理时延低于1.8 ms,实现低空复杂场景弱小目标高精度高鲁棒快速实时检测。     

电视制导小灵巧炸弹三维导引律

小灵巧炸弹是一种采用倾斜转弯(BTT)控制方式的小型面对称电视制导航空弹药,在实际飞行中必须确保其导引头框架角不超出可用范围。针对上述问题,根据时变偏置比例导引的思想,在三维空间中设计视线角速率偏置项,通过姿态角时变修正实现框架角约束,提出了一种带导引头框架角约束的三维纯比例导引律。仿真结果表明该方法在保证小灵巧炸弹战技指标要求的同时有效减少了框架角需求。     

假目标配置数量模型及其效费比分析

在现代战争中,示假伪装的地位越来越重要。引入了真假目标的发现识别概率的指数分布模型,综合考虑作战时间、真假目标价格比等因素,确定战场生存能力和配置假目标成本两个目标函数,并以最小加权偏差法确定两者权重,建立基于多目标决策的假目标配置数量模型。最后结合实际问题,将各参数条件带入模型计算出假目标的最佳配置数量,同时利用假目标的效费比模型进行检验分析,从而为战时假目标配置数量的确定提供参考依据。     

改进非凸估计与非对称时空正则化的红外小目标检测方法

针对复杂背景下的红外小目标检测,在非对称时空正则化约束的非凸张量低秩估计算法基础上,提出了一种新的核范数估计方法代替原算法中的估计方法。提出基于结构张量与多结构元顶帽(Top-Hat)滤波的自适应权重张量对目标张量进行约束,增强目标张量稀疏性的同时抑制其中残存的强边缘结构。实验结果表明,所提改进算法能够更好地消除图像中强边缘结构对检测结果的影响,在保证检测率的情况下,较原算法具有更低的虚警率。     

基于部件模型的无人机系统小样本车辆目标识别方法

对地目标检测与识别是无人机系统典型任务之一,但受限于任务特殊性,往往难以获取足够的目标样本数据以实现高可靠的目标识别.为此,结合人的认知特性,提出一种基于部件模型的小样本车辆目标识别方法,可有效提高无人机感知能力.采用视觉显著性检测与物体性检测相结合的检测方法,提取目标可能区域;采用基于图论的GrabCut方法与最大类...     

The strategic purpose of individual augmentee officers for junior partners in multinational military operations

ABSTRACT

This article examines the strategic purpose of Individual Augmentee Officers (IAOs) for junior partners in multinational military operations through an exploratory case study of Danish IAOs in Iraq and South Sudan between 2014 and 2017. IAOs are individual officers who are moved from their normal functions to be seconded to other units of the armed forces of their own or another country or an international institution. The study concludes that IAOs function as strategically important, yet not necessarily indispensable, supplements to military contingents in several ways: making tangible contributions to the overall mission (contributing), gaining access to information, knowledge, and experience (learning), and lobbying decision-making processes within mission headquarters (lobbying). The usefulness of IAOs depends on whether the junior partner has specific interests and a significant presence in the theatre and whether the mission is conducted as a UN mission, a NATO mission, or an ad hoc coalition.