示踪瞄准在小口径高炮火控系统设计中的应用

针对现有高炮火控系统中的一些问题 ,提出一种新的射击瞄准控制体制并给出了相应的实现方案。该方案以示踪瞄准为其基本原理 ,不需要对目标运动规律做出任何假设 ,也不需要平滑时间 ,因而可缩短系统的反应时间 ,适应了现代防空作战的需要。     

陶瓷内衬组合钢管的应力分析

利用厚壁和薄壁圆筒应力分析理论对陶瓷内衬组合钢管的应力进行了分析,并给出当钢管直径一定的情况下,确定陶瓷最小壁厚的一种方法。     

基于北斗信号的降雨信息监测方法

为充分挖掘北斗信号大数据资源的应用价值,拓展其在大气海洋领域的应用方向,重点从理论上研究了利用北斗信号的极化相移监测降雨信息问题.结合北斗信号的频率和极化特征,从极化相移的定义出发,分析了北斗信号经过雨区和降雨粒子相互作用的微物理过程,建立了极化相移与降雨强度之间的数学模型;利用数值模拟方法对该数学模型进行分析得出,北...     

改进的遗传算法在导弹火力分配中的应用

弹道导弹系统是一个非常复杂的系统,有其自身的特点,其造价昂贵,数量有限,发射点也很分散.因此,火力分配问题在弹道导弹射击中具有极为重要的地位.尤其对于常规战术弹道导弹,火力分配的合理与否将直接影响作战效果与战斗力的发挥.根据地地战术导弹的作战运用特点,建立了导弹火力分配的优化模型;详细介绍了一种改进的遗传算法,将其应用于火力分配优化模型的求解,通过算例比较,证明该改进算法更能有效快速地找到最优解.     

空间区域划分的战场空间建模

复杂作战交互所具有的区域性特征,对作战仿真系统战场空间建模提出了新的要求.首先阐述了基于空间区域划分的战场空间模型的实现思想、概述了模型实现方法,并给出了模型的形式化描述;然后,就基于空间区域划分的战场空间模型对于区域性复杂作战交互建模的支持进行了简单探讨;最后,通过一个简单的实例,分析了基于空间划分的战场空间模型对于作战仿真系统运行性能的影响.     

基于云理论的雷达组网作战效能评估

传统的雷达组网作战效能评估一般采用定性评估方法,而对于精确的定量评估,目前尚缺有效的方法.云理论是一种用于处理不确定性和含糊性知识的数学工具,可实现概念与数据之间的相互转换.结合雷达组网的因素分析,提出了组网雷达作战效能评价指标体系,然后利用云理论的有关知识,建立了各指标的云模型及其多维加权综合云的重心表示.最后应用云重心评价方法给出系统的效能评估值,解决了效能评估中定性语言到定量的转化问题,最后给出了一个雷达组网作战效能评估的算例.     

Traffic channeling under uncertain conversion rates on e-commerce platforms

Traffic is the lifeblood of every e-commerce platform. The question of how to channel traffic to merchants operating on a platform lies at the heart of platform management. We consider a platform on which two independent merchants sell their products. Merchants compete on inventory in the sense that some of the unmet demand at one merchant will spill over to the other. The platform channels traffic based on products' conversion rates to maximize the total sale on the platform. We show that traffic channeling plays three roles. First, it allows more efficient allocation of traffic; that is, the merchant with a high conversion rate is given a higher priority in receiving traffic. Second, it allows the platform to control demand spillover between the merchants to maximize total sales. The platform either facilitates or prevents demand spillover, depending on product substitutability. Third, traffic channeling intensifies competition between the merchants and hence increases the total inventory. More efficient allocation of traffic and the increase in inventory increase sales inequality between the merchants. In contrast, demand spillover decreases sales inequality. While the platform always benefits from traffic channeling, the merchants do not benefit when their products are moderately substitutable. Interestingly, when the two products are owned and sold by the same merchant, the opposite happens–traffic channeling always benefits the merchant but may hurt the platform. Our study provides a basis for informed discussions on how platforms should channel traffic in response to conversion rates, and how traffic channeling affects the welfare of merchants and platforms.