Revenue maximization in two-station tandem queueing systems

We study optimal pricing for tandem queueing systems with finite buffers. The service provider dynamically quotes prices to incoming price sensitive customers to maximize the long-run average revenue. We present a Markov decision process model for the optimization problem. For systems with two stations, general-sized buffers, and two or more prices, we describe the structure of the optimal dynamic pricing policy and develop tailored policy iteration algorithms to find an optimal pricing policy. For systems with two stations but no intermediate buffer, we characterize conditions under which quoting either a high or a low price to all customers is optimal and provide an easy-to-implement algorithm to solve the problem. Numerical experiments are conducted to compare the developed algorithms with the regular policy iteration algorithm. The work also discusses possible extensions of the obtained results to both three-station systems and two-station systems with price and congestion sensitive customers using numerical analysis.     

基于AOS包业务模型的最优帧长与吞吐量性能

分析了影响AOS包业务吞吐量性能的因素及帧长度对系统吞吐量性能的影响,建立了包复用效率及差错信道下吞吐量的数学模型,通过仿真验证数学模型的可靠性。并进一步得出差错信道下使系统吞吐量性能最大的最优帧长度配置。研究结果为以吞吐量性能为指标,通过信道状态自适应调节帧长来优化AOS协议提供了理论依据。     

固体运载器姿态控制系统自适应滤波器设计

采用大长细比、轻结构质量设计方案的固体运载器结构刚度较小,姿态控制系统设计需要考虑弹性振动的影响。设计了自适应滤波器实现对箭体弹性振动信号的抑制:将滤波器参数自适应问题转化为系统参数辨识问题,通过Steiglitz-McBride参数辨识方法求解,该方法具有计算复杂性低、收敛迅速等特点,适用于箭上计算机实时计算。通过闭环仿真表明,在箭体弹性频率发生变化的条件下,具有自适应滤波器的控制系统能够跟踪这种变化,有效抑制振动信号对控制器的影响,保持运载器姿态运动稳定。     

基于双向映射的非网格型全向图展开插值方法

原始的全向图存在严重的同心圆环状变形,通常需展开为更适合人眼观察的柱面全景图像。结合折反射全向成像特点,提出一种基于双向映射的全向图展开为柱面全景图像的插值方法,通过光路跟踪得到图像间的坐标映射关系,将所要生成的柱面全景图中每一点正向映射到原始的全向图中,确定插值邻域点;将这些邻域点逆向投影到柱面全景图中,针对邻域点在柱面全景图中呈非网格型分布的特点,采用非均匀二维插值算法进行图像插值运算。该方法既准确地定位插值邻域点,又避免了全向图的非线性畸变对邻域点权重计算的不利影响。实验证明该方法能有效提高插值精度和展开后图像的质量。     

Potential impact of recharging plug‐in hybrid electric vehicles on locational marginal prices

Plug‐in hybrid electric vehicles (PHEVs), upon market penetration, will create additional recharging loads to the electric power systems. This article considers different recharging scenarios and uses game theoretic models to study the potential impact of the recharging loads on locational marginal prices (wholesale electricity prices). Computational results from a Pennsylvania‐New Jersey‐Maryland Interconnection case study show that, under the existing recharging infrastructures, even a small magnitude of load increase caused by PHEV recharging could have a significant undesirable impact on locational marginal prices. The impact could be mitigated to a varying extent by the availability of possible future recharging infrastructures, including realtime pricing recharging meters, battery stations, or vehicle‐to‐grid technology.© 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

弹药质量问题分析研究

给出了弹药质量问题分析的概念,研究了弹药质量问题分析的特性及其分类,建立了弹药质量问题分析理论。     

型号标准化文件体系初探

本文结合型号产品研制标准化工作经验,阐述了型号标准化文件体系建立的目的及意义。依据本企业和其他企业多年来型号产品研制标准化工作经验,并进行分析总结的基础上重点从五个方面阐述了标准化文件体系特点。在总结过去工作经验的基础上科学的提出标准化文件体系建立的依据及标准化文件体系的结构和框架。     

反劫持四大首备要素

文章认为,反劫持人质行动首要原则是以人为本,生命第一;反劫持人质行动首要战法:用谋求胜,攻心为上;反劫持人质行动首要装备是"慈杀"武器为主导;反劫持人质行动成员首要素质是忠诚强悍,智勇双全。     

质量热气球模型及对策研究

本文从质量与质量管理的内涵入手,深入分析了影响产品质量水平的因素,结合国内外质量控制成功经验的基础上,创造性的提出了质量热气球模型,并对该模型的特性进行了分析,提出了针对性的对策。     

C/SiC复合材料残余应力的电火花小孔法测定研究

进行了C/SiC复合材料残余应力的小孔法表征.基于现有小孔法的不足以及材料的较好电导率,提出了电火花打孔法的残余应力测量方法,建立了相应的残余应力测量流程.进行了不同平整表面样品的残余应力测量.结果表明电火花打孔法具有较好的区分性,也表明C/SiC复合材料具有较小的本征残余应力和机加工应力,这说明:C/SiC复合材料作为反射镜材料具有很好的面形稳定性的优势.