协方差压缩感知逆合成孔径雷达成像技术

为解决低信噪比条件下短观测时间雷达成像问题,提出一种基于回波协方差矩阵处理的压缩感知逆合成孔径雷达成像技术。该方法构建了回波协方差矩阵层面下的压缩感知问题模型,并通过特定的线性变换降低环境噪声对成像结果的影响。在仿真实验中,通过处理短观测时间和低信噪比条件下的模拟回波数据,该方法获得比传统压缩感知方法像质更好、对比度更强的目标成像结果。同时,其成像结果的目标背景比和背景噪声能量两个雷达图像评价指标都优于传统方法,进一步验证了该方法的有效性。     

建筑消防水系统工程施工存在的问题及建议

针对近年来对一些建筑消防设施水系统工程的中期检查和工程消防验收．以及对投入使用后的建筑进行消防监督检查中发现的建筑消防设施水系统工程存在的一些施工质量问题，在依据有关消防技术性规范的基础上，查找根源，提出几点建议。     

面向多平台多目标协同跟踪的指派问题

针对多平台多目标协同跟踪中要求多个无人地面平台尽可能均匀地协同跟踪多个目标的特点,提出了改进的离散粒子群优化算法。首先采用连续型粒子群优化算法中的速度和位置迭代公式,然后对粒子位置进行离散编码,使粒子编码对应于可行的指派方案;其次,在优化算法中引入局部搜索,提高算法寻优性能。最后将所提算法应用于多平台多目标协同跟踪中的指派问题,并与未加入局部搜索的粒子群优化算法比较,仿真结果表明,加入局部搜索后的离散粒子群优化算法具有较好的寻优性能。     

武警学院研究生教育回顾与发展问题思考

武警学院研究生教育已开办六年,分析六年来研究生教育的基本情况、取得的成绩和存在的问题,对于今后一个时期的研究生教育具有现实指导作用。     

就业与社会稳定的关联性探析

就业与社会稳定的正相关：就业的保障功能的发挥、激励功能的发挥、融入功能的发挥、协作功能的发挥，都有助于实现社会稳定。就业存在的问题与社会稳定的负相关：失业人员大量存在、就业弱势群体大量存在、就业权益缺失，都影响着社会稳定。     

The one‐warehouse multiretailer problem with an order‐up‐to level inventory policy

We consider a two‐level system in which a warehouse manages the inventories of multiple retailers. Each retailer employs an order‐up‐to level inventory policy over T periods and faces an external demand which is dynamic and known. A retailer's inventory should be raised to its maximum limit when replenished. The problem is to jointly decide on replenishment times and quantities of warehouse and retailers so as to minimize the total costs in the system. Unlike the case in the single level lot‐sizing problem, we cannot assume that the initial inventory will be zero without loss of generality. We propose a strong mixed integer program formulation for the problem with zero and nonzero initial inventories at the warehouse. The strong formulation for the zero initial inventory case has only T binary variables and represents the convex hull of the feasible region of the problem when there is only one retailer. Computational results with a state‐of‐the art solver reveal that our formulations are very effective in solving large‐size instances to optimality. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

建立维和警察心理调控机制之我见

联合国维和警察是一个特殊的职业群体，所处的工作和生活环境艰苦、恶劣、危险。维和警察面对这种超出常规的精神压力，出现各种各样的心理问题是必然的。维和警察的心理问题仅仅依靠维和警察个人自我调节是远远不够的，必须建立一套有效的调控机制来预防和治疗其心理问题，维护好他们的心理健康。     

非平衡机制下激光与等离子体相互作用机理

采用三温度热化学非平衡模型,考虑了激光能量在空气等离子体中的共振吸收和逆韧致吸收机制,用有限差分NND格式对控制方程组进行数值离散.对等离子体点火过程进行耦合计算,并研究了不同入射激光强度条件下等离子体吸收波的形成和演化机制,讨论了粘性扩散效应对等离子体吸收波的影响.结果表明,在初始温度300K,大气压力条件下,生成ZND模式的LSD波所需最小激光强度为5.0×106 W/cm2.     

浅谈教师对数学学业不良生的影响

本文通过教师的信念、课堂教学、教师的问题意识三个方面的探讨，来论述教师对数学学业不良生的影响，希望通过教师的作用有效促进数学学业不良生的转化。     

Capacity expansion and cost efficiency improvement in the warehouse problem

The warehouse problem with deterministic production cost, selling prices, and demand was introduced in the 1950s and there is a renewed interest recently due to its applications in energy storage and arbitrage. In this paper, we consider two extensions of the warehouse problem and develop efficient computational algorithms for finding their optimal solutions. First, we consider a model where the firm can invest in capacity expansion projects for the warehouse while simultaneously making production and sales decisions in each period. We show that this problem can be solved with a computational complexity that is linear in the product of the length of the planning horizon and the number of capacity expansion projects. We then consider a problem in which the firm can invest to improve production cost efficiency while simultaneously making production and sales decisions in each period. The resulting optimization problem is non‐convex with integer decision variables. We show that, under some mild conditions on the cost data, the problem can be solved in linear computational time. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 367–373, 2016