基于控制通道融合的瞄准线组合稳定技术

提出一种光电二级稳定粗、精控制通道融合新方案,并与现有粗、精控制通道相互独立二级稳定方案相比较。仿真结果表明,粗、精控制融合方案无论在成本、体积、性能和精度上,都优于现有二级稳定方案。新方案的可行性已通过原理样机得到验证。     

瞄准具多因素误差分析模型

本文利用坐标轴旋转公式建立了瞄准具多因素误差分析模型。为机械式、半独立式瞄准具的不解体检测提供了理论基础.     

瞄准线稳定精度的影响因素仿真

瞄准线稳定精度是直升机载稳瞄系统的关键技术指标之一,它影响着系统的其他关键性指标如照射精度、跟踪精度、作用距离等。因此提高瞄准线稳定精度是设计和研制机载稳瞄系统至关重要的一项任务。论文分析和研究了影响瞄准线稳定精度的因素,并采用Simulink建立数学模型,对瞄准线稳定精度的影响因素进行仿真分析,得到各因素对稳定精度的影响趋势,为机载稳瞄系统的设计工作提供了理论基础。     

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     

结合局部描述和拓扑约束的直线段匹配算法

针对弱纹理目标匹配问题,提出了一种基于直线局部邻域梯度信息和全局结构信息的直线匹配算法:对均值标准差直线描述符进行改进用于初始匹配;利用直线间的全局拓扑结构滤除误匹配;利用迭代拓扑滤波寻找更多的匹配,同时引入全局角度约束提高算法效率并进一步滤除错误匹配。实验表明,在光照变化、图像旋转、图像模糊、尺度变换、视点变化等条件下,该方法都具有很强的鲁棒性,并在匹配效率和准确度上优于现有的两种比较流行的方法。     

应用荧光法分析汽油燃烧残留物

通过应用三维荧光光谱法,对比分析了汽油、煤油、柴油及其燃烧残留物的三维荧光特征参数,主要分析了荧光峰位置、半峰宽、荧光发光区域分布、次峰与主峰的荧光强度比等,验证了荧光光谱法在鉴别火场汽油助燃剂燃烧残留物中的可行性,为火灾原因调查提供更多依据。     

浅析油品密度在线检测的几种方法

油品密度是油品交接计量中的重要参数之一,因此需要对它进行准确的测定。随着科学技术的发展,检测油品密度的方法也在不断的进步。介绍了浮子法、静压法、射线法、振动法以及超声波法等几种比较有效的油品密度在线检测方法,并详细分析了每一种方法的优缺点以及适用的场合,最后提出了几个在线检测应该注意的问题,供使用者根据实际情况选择合适的检测方法。     

二维损耗和色散介质光子晶体传输特性的研究

将传输矩阵法(TMM)用于光子晶体传输特性的研究,采用Mur近似吸收边界和周期边界来截断计算区域,计算了以TM模正入射时,二维方格子光子晶体在完整周期结构下的透过率谱;在微波波段制作了光子晶体模型,并设计了实验装置,实验与数值模拟计算结果相符合;另外还研究了有损介质光子晶体、色散和吸收介质光子晶体的传输特性,及其对光子禁带的影响。     

大区域防空作战条件下防空兵作战方案的优选

大区域防空作战条件下防空作战指挥决策往往面临的是多目的(指标)决策,在分析作战指标的基础上对所选作战方案的益损值进行标准化处理和贴近度排序,并求出各方案的排序频数,将其转化为最优线性分派模型进行优化,从而使所有方案得到总体最优排序。     

On‐line parameter estimation for a partially observable system subject to random failure

In this paper, we study the on‐line parameter estimation problem for a partially observable system subject to deterioration and random failure. The state of the system evolves according to a continuous time homogeneous Markov process with a finite state space. The system state is not observable, except for the failure state. The information related to the system state is available at discrete times through inspections. A recursive maximum likelihood (RML) algorithm is proposed for the on‐line parameter estimation of the model. The RML algorithm proposed in the paper is considerably faster and easier to apply than other RML algorithms in the literature, because it does not require projection into the constraint domain and calculation of the gradient on the surface of the constraint manifolds. The algorithm is illustrated by an example using real vibration data. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006