基于TPC-C基准的ACID验证工具的实现

文中针对TPC-C基准的ACID测试用例,重点分析了隔离性测试用例的设计意图,用java语言设计实现了一个开源的ACID验证测试工具,介绍了该工具的体系结构及设计思路,并使用该工具对MySQL6.0数据库系统与Oracle9i数据库系统进行了验证和对比,其中MySQL数据库使用了InnoDB和Falcon两种不同的事务型引擎。     

车载机载稳瞄系统FSM补偿技术

提出并采用一种粗／精／组合二级稳定的新方案,用于对车、机载多传感器光电综合系统瞄准线（ＬＯＳ）及图象进行高精度稳定与跟踪。本技术的重要特征是采用挠性支承精稳反射镜（ＦＳＭ）组件以及粗／精多回路复合控制技术以获得高回路带宽和对扰动的大幅度衰减。用一个双自由度陀螺进行稳定及跟踪,有效地解决了粗／精通道的匹配与耦合。与传统的ＬＯＳ稳定系统相比较,稳定精度提高近一个数量级     

雷达维修保障系统效能的云重心评估

在雷达维修保障系统效能实际评估中,各项指标的参数通常以定性描述的形式来获得,模糊性和随机性较强。为了合理地处理模糊性、随机性以及定性描述与定量描述的关系,引入云重心评价法,提出一种基于多级云重心评价的雷达维修保障系统效能多级评估方法,得到了评估结果。该方法可以对各项指标进行优劣排序,评估结果较好地显示了当前系统效能的状态。     

地面目标红外辐射特征测试研究

为研究地面目标红外辐射特征,进行了室内材料测试和外场地面目标测试,分析材料材质、太阳辐射、风速、空气温湿度、自身热源等因素对地面目标红外辐射特征的影响。结果表明:材料材质对红外辐射特征影响显著;冷态时,地面目标红外辐射特征主要受太阳辐射影响,其次是空气温度、材料热容量和风速;热态时,地面目标红外辐射特征主要受工作热源影响,其次是太阳辐射、空气温度、材料热容量和风速。在进行地面目标红外隐身设计时,应考虑太阳辐射、自身热源等因素的影响,并从结构设计和材料使用两方面着手。     

基于Richardson外推的定步长Adams-Cowell改进积分方法

针对卫星轨道微分方程组的数值解法,提出了一种基于Richardson外推思想的定步长Adams-Cowell积分方法,分别对Adams方法和Cowell方法的PECE格式进行外推改进。结合外推改进的详细理论推导,总结出了不同阶积分公式的系数的数学规律,并以表格的形式给出,方便了工程实践。最后,利用卫星轨道二体运动方程对8阶改进的方法进行了仿真分析,由仿真结果可知,和未改进的算法相比,改进后的算法计算精度有了明显改进,在某些特定积分步长下的计算精度能提高一个数量级,证明了改进算法的有效性,此8阶改进的方法可用于工程实践。     

Selling to strategic and loss‐averse consumers: Stocking,procurement, and product design policies

Motivated by the presence of loss‐averse decision making behavior in practice, this article considers a supply chain consisting of a firm and strategic consumers who possess an S‐shaped loss‐averse utility function. In the model, consumers decide the purchase timing and the firm chooses the inventory level. We find that the loss‐averse consumers' strategic purchasing behavior is determined by their perceived gain and loss from strategic purchase delay, and the given rationing risk. Thus, the firm that is cognizant of this property tailors its inventory stocking policy based on the consumers' loss‐averse behavior such as their perceived values of gain and loss, and their sensitivity to them. We also demonstrate that the firm's equilibrium inventory stocking policy reflects both the economic logic of the traditional newsvendor inventory model, and the loss‐averse behavior of consumers. The equilibrium order quantity is significantly different from those derived from models that assume that the consumers are risk neutral and homogeneous in their valuations. We show that the firm that ignores strategic consumer's loss‐aversion behavior tends to keep an unnecessarily high inventory level that leads to excessive leftovers. Our numerical experiments further reveal that in some extreme cases the firm that ignores strategic consumer's loss‐aversion behavior generates almost 92% more leftovers than the firm that possesses consumers’ loss‐aversion information and takes it into account when making managerial decisions. To mitigate the consumer's forward‐looking behavior, we propose the adoption of the practice of agile supply chain management, which possesses the following attributes: (i) procuring inventory after observing real‐time demand information, (ii) enhanced design (which maintains the current production mix but improves the product performance to a higher level), and (iii) customized design (which maintains the current performance level but increases the variety of the current production line to meet consumers’ specific demands). We show that such a practice can induce the consumer to make early purchases by increasing their rationing risk, increasing the product value, or diversifying the product line. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 435–453, 2015     

防空兵作战战场环境的仿真

战场环境的仿真就是利用虚拟三维仿真技术形象地模拟防空兵作战指挥训练场景及训练过程,合理构造系统总体结构框架,设计防空兵作战战场环境的基本模块:地形地貌、天空体、气象、大气、高炮导弹战车等模型、战场态势、空情处理、声音以及通信等.重点讨论基于遥感、DEM、分形算法等技术地形匹配技术,基于半球体网格的天空体模型,以及空情航迹滤波算法,基于粒子系统的烟雾处理等,对开展防空兵战技训练及有关软件的研制具有一定的理论和实践参考价值.     

基于物元分析的装备质量监督业绩评价

在构建出评价指标体系和确定指标权重的基础上,将物元理论引入到装备质量监督业绩评价中来。通过确定被评价物元和标准物元,以关联函数为纽带,得出装备质量监督业绩水平,为装备质量监督评价提供了一种新的科学方法。     

高中生成就动机和一般自我效能感及其关系的研究

本文采用《一般自我效能感量表》(GSES)和《成就动机量表》(AMS)对253名高中生进行了测量,以探讨高中生成就动机与一般自我效能感之间的关系。其结果为:1.高中生成就动机性别差异与年级差异均不显著(P>0.05);2.高中生一般自我效能感的性别差异与年级差异也不显著(P>0.05)。     

甲基三硫代膦酸二乙酯合成反应液的气相色谱-质谱分析

在OPCW第18次水平考试土样中检测到一未知化合物,经多种分析技术测定,判断可能是甲基三硫代膦酸二乙酯．对合成甲基三硫代膦酸二乙酯的反应液进行了气相色谱一质谱测定,并对此反应液中的部分产物进行了质谱解析．