脉冲修正弹控制参数粒子群优化算法

针对脉冲修正弹自身控制离散不连续特征,开展脉冲修正弹脉冲控制参数优化设计方法研究。考虑到脉冲成本和精度的双重要求,选择以脉冲发动机工作次数和脱靶量最少为双目标的函数。在风干扰条件下,提出以脉冲控制时间间隔为离散脉冲控制参数设计变量建立优化模型,以此发展一种改进型递减惯性权重粒子群优化脉冲控制参数的方法,提高修正参数优化收敛速度。仿真结果表明:该算法能快速有效地获得最优解,为在干扰条件下寻找最优的脉冲修正参数和脉冲工作方式提供一种优化设计思路。     

65 nm工艺双层三维静态存储器的软错误分析与评估

新兴的三维静态存储器将代替二维静态存储器被广泛用于高性能微处理器中,但它依然会受到软错误的危害。为了能够快速、自动分析多层管芯堆叠结构的三维静态存储器软错误特性,搭建了三维静态存储器软错误分析平台。利用该平台对以字线划分设计的三维静态存储器和同等规模的二维静态存储器分别进行软错误分析,并对分析结果进行对比。研究结果表明二维和三维静态存储器的翻转截面几乎相同,但三维静态存储器单个字中发生的软错误要比二维静态存储器更严重,导致难以使用纠检错技术对其进行加固。静态模式下二维和三维静态存储器敏感节点均分布于存储阵列中,表明静态模式下逻辑电路不会引发软错误。     

太阳能热推进系统聚光器参数优化

采用先进遗传算法对太阳能热推进系统一次聚光器参数进行优化,达到减小推进系统质量的目的。以聚光器太阳光收集效率和聚光器质量为优化目标函数,建立聚光器工作的数学模型,并开展相关仿真研究。仿真结果表明,先进遗传算法可有效用于太阳光收集效率和聚光器质量优化分析。     

射频识别系统的多目标识别-反碰撞算法

对多目标识别技术的二进制搜索算法、时隙ALOHA算法进行了剖析,并对ALOHA算法用概率论和数理统计的方法进行了深入的理论分析,得出要根据所设计的射频识别系统的特点合理采用各种算法方可得到良好的效果.该算法的实现对提高高速公路上自动收费系统、人员和物流管理等各领域的工作效率具有一定的指导意义.     

推进军事学研究生教育科学发展

推进军事学研究生教育科学发展,必须贯彻落实科学发展观,坚持以人为本,树立发展的质量观、特色的质量观、全面的质量观;坚持协调发展,统筹数量规模与质量效益的关系、学术型标准与应用型标准的关系、共性要求与个性发展的关系;坚持固本强基,加强学科专业建设、导师队伍建设、政策制度建设,为研究生教育的可持续发展提供强大动力。     

努力做社会主义荣辱观的模范实践者

社会主义荣辱观的提出,为构建和谐社会、推进思想道德建设提供了根本遵循,明确了当代中国最基本价值导向和行为准则。我们要紧密结合部队建设实际,增强践行“八荣八耻”的自觉性和坚定性,努力做社会主义荣辱观的模范实践者。     

用科学发展观指导扎实有效地开展政治工作

科学发展观是加强和改进政治工作的重要指导方针。更加有力、更加扎实、更加富有成效地开展政治工作,必须牢固确立以科学发展观为指导的理念,切实理清工作思路,努力掌握科学方法,不断提高能力素质。     

Ordering policies for an inventory system with three supply modes

This article explores ordering policies for inventory systems with three supply modes. This model is particularly interesting because the optimal ordering decision needs to balance the inventory and purchase costs, as well as the costs for earlier and later periods. The latter cost trade-off is present only in inventory systems with three or more supply modes. Therefore, the result not only offers guidelines for the operation of the concerned inventory systems, but also provides valuable insight into the complex cost trade-offs when more supply modes are available. We assume that the difference between the lead times is one period, and the inventory holding and shortage costs are linear. We analyze two cases and obtain the structure of the optimal ordering policy. Moreover, in the first case, explicit formulas are derived to calculate the optimal order-up-to levels. In the second case, although the optimal order-up-to levels are functions of the initial inventory state and are not obtained in closed form, their properties are discussed. We also develop heuristic ordering policies based on the news-vendor model. Our numerical experiments suggest that the heuristic policies perform reasonably well. © 1996 John Wiley & Sons, Inc.     

Analysis of a two-component series system with a geometric process model

In this article, a geometric process model is introduced for the analysis of a two-component series system with one repairman. For each component, the successive operating times form a decreasing geometric process with exponential distribution, whereas the consecutive repair times constitute an increasing geometric process with exponential distribution, but the replacement times form a renewal process with exponential distribution. By introducing two supplementary variables, a set of partial differential equations is derived. These equations can be solved analytically or numerically. Further, the availability and the rate of occurrence of failure of the system are also determined. © 1996 John Wiley & Sons, Inc.     

低频UWBSAR辐射校准模型

低频超宽带合成孔径雷达(Ultra Wide Band Synthetic Aperture Radar,UWBSAR)的辐射校准是系统研制和应用过程中必须面对的课题。低频UWBSAR的特点使得常规SAR辐射校准技术不再适用。充分考虑校准参数随频率和方位角的变化,给出适合该系统的辐射校准方法,得到低频UWBSAR图像辐射校准模型。利用该模型,对系统辐射校准误差进行了分析。