Optimal inventory control policy for periodic‐review inventory systems with inventory‐level‐dependent demand

We consider a setting in which inventory plays both promotional and service roles; that is, higher inventories not only improve service levels but also stimulate demand by serving as a promotional tool (e.g., as the result of advertising effect by the enhanced product visibility). Specifically, we study the periodic‐review inventory systems in which the demand in each period is uncertain but increases with the inventory level. We investigate the multiperiod model with normal and expediting orders in each period, that is, any shortage will be met through emergency replenishment. Such a model takes the lost sales model as a special case. For the cases without and with fixed order costs, the optimal inventory replenishment policy is shown to be of the base‐stock type and of the (s,S) type, respectively. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012     

MEFP战斗部结构的正交优化设计

以多爆炸成型弹丸(MEFP)为计算模型,应用显式有限元程序LS-DYNA,分析了药型罩间距、锥角、壁厚、装药高度和装药直径5种因素对MEFP发散角的影响规律。结果表明:随着药型罩间距、壁厚和装药直径的增加以及药型罩锥角、装药高度的减小,MEFP的发散角在减小。在此基础上以MEFP发散角为命中和毁伤概率指标,应用正交优化方法针对5种结构因素对MEFP发散角的影响主次关系进行了分析研究。结果表明药型罩壁厚是MEFP战斗部命中和毁伤概率的主要影响因素,并得到了5种结构因素各水平的最优组合。     

星光大气折射圆锥扫描观测导航方法研究

针对跨轨道飞行器飞行特点和轻小型化设计要求,提出了一种基于单个星敏感器的星光折射圆锥扫描观测导航方法,建立了导航系统数学模型,采用扩展卡尔曼滤波(EKF)作为信息融合方法,最后通过仿真计算验证了方法的可行性.该方法为轻小型化自主导航系统设计提供了新的思路.     

基于DRFM的机载PD雷达干扰研究

针对传统干扰技术对PD雷达干扰的不足,噪声干扰对干扰机功率要求高,欺骗干扰产生的干扰数目单一,基于当前对抗先进体制雷达的手段——DRFM,对PD雷达干扰进行研究。通过将截获的雷达信号存储、处理,按程序设定的转发间隔重复读出当前采样信号并转发,产生了多个距离欺骗假目标;通过对每次转发干扰进行频率调制,产生了包含距离速度欺骗的一系列假目标;并经过Matable仿真验证了在PD雷达窄带滤波器中,出现多个距离或速度欺骗假目标。并通过仿真验证了干扰的有效性。     

WinCC在数字化油库监控系统中的应用

为适应油库数字化建设需要,解决油库监控中区域分散、设备点多、监控面广导致的数据采集和统一管理较为困难、系统实时性差、可靠性低等问题,设计了基于WinCC的数字化油库监控系统。该设计应用OPC技术实现与控制器的数据交互,利用用户归档和变量归档,有效实现数据库的建立、查询和修改,克服了软件编程中与现场设备通信复杂和一般组态软件数据管理较差的缺陷,大大缩短了系统开发周期,使系统操作方便,界面友好美观,维护简单快捷,可广泛应用于油库监控。     

一种基于TMS320C6678的JPEG编码算法并行实现方法

针对数字视频总线在装备应用中的实时性需求,在分析JPEG编码原理和多核DSP任务并行的基础上,提出了一种基于TMS320C6678的JPEG编码算法并行实现方法,该方法实现了任务级并行流水和核间高效通信。实验结果表明,该方法是可行、有效的,并且基于TMS320C6678的JPEG编码系统的实时处理能力有很大提升。     

A novel launch dynamics measurement system for multiple launch rocket system and comparative analysis with numerical simulations

In this paper,a novel launch dynamics measurement system based on the photoelectric sensor pair is built.The actual muzzle time(i.e.a time duration that originates from the initial movement to the rocket's departure from the muzzle)and the muzzle velocity are measured.Compared with the classical methods,the actual muzzle time is obtained by eliminating the ignition delay.The comparative analysis method is proposed with numerical simulations established by the transfer matrix method for multibody systems.The experiment results indicate that the proposed measurement system can effectively measure the actual muzzle time and reduce the error of classical methods,which match well with the simulation results showing the launch dynamics model is reliable and helpful for further analysis and design of the MLRS.     

The art of net assessment and uncovering foreign military innovations: Learning from Andrew W. Marshall’s legacy

ABSTRACT

Andrew W. Marshall, who shaped the way in which contemporary international security experts think about strategy, has been mostly associated with the invention of net assessment. The intellectual sources of this analytical technique, and of the related competitive strategies concept, could be traced to Marshall’s efforts to uncover Soviet post-World War II defense transformations. This article outlines the essence of these Soviet innovations – the empirical frame of reference that inspired Marshall. It provides a new perspective on the history of the net-assessment methodology, advances the debate within strategic studies over the nature of military innovations, and offers insights for experts examining defense transformations worldwide.     

The Mexican War: frontier expansion and selective incursion

ABSTRACT

Mexico’s defeat in the war that (in the U.S.) takes the country’s name resulted as much from the strategic context created by unrealized nation-building that followed independence as it did from American tactical supremacy. Three centuries of Spanish empire did not translate into national military excellence due to the decades of revolutionary upheaval that followed the sudden decapitation occasioned by Napoleon’s ouster of the monarchy in Madrid. That the occupation which followed major combat provided salutary lessons learned in dealing with guerrillas rather than a Vietnam-like litany of quagmire eventuated from the conscious designs of military leadership steeped in the same Napoleonic dynamic that had produced our opponent. The United States wisely chose to leave issues of state-building and governance to the Mexicans themselves, while annexing the sparsely populated northern remnant of Spanish empire.     

Private military contractors’ financial experiences and incentives

ABSTRACT

This article analyses findings from an original survey of 187 private military contractors on their incentives for working in the industry. Perceptions of contractors as “greedy, ruthless, and unscrupulous mercenaries” shape both public and military opinions of outsourcing and may impact U.S. military effectiveness, civil–military relations, and contractor identity. We find that contractors are motivated by a range of factors and that their financial experiences are not clearly more positive than that of state military troops. We recommend broad education of military and defense officials and the public in the U.S. and other relevant nations, regarding the true incentives of modern-day, Western contractors, in an effort to dispel misperceptions, increase effective utilisation of contractors, and beneficially shape PMC-military coordination. DoD may consider integrating such training into its current efforts to improve outsourcing, including its Joint OCS Planning and Execution Course, pre-deployment fora, and curricula of advanced military studies schools.