Mathematical formulation and heuristic algorithm for the block relocation and loading problem

This study considers the block relocation and loading problem in container terminals. The optimal loading sequence and relocation location are simultaneously decided on the basis of the desired ship‐bay and initial yard space configuration. An integer linear programming model is developed to minimize the number of relocations in the yard space on the basis of no shifts in the ship bay. The accuracy of the model is tested on small‐scale scenarios by using CPLEX. Considering the problem size in the real world, we present a rule‐based heuristic method that is combined with a mathematical model for the removal, loading, and relocation operations. The influence of rules on algorithm performance is also analyzed, and the heuristic algorithm is compared with different types of algorithms in the literature. The extensive numerical experiments show the efficiency of the proposed heuristic algorithm.     

超宽带雷达的欺骗式干扰技术研究

根据超宽带雷达的工作方式和成像特点,提出基于DRFM与DDS技术对超宽带雷达实施假目标干扰的方法.通过分析超宽带雷达距离维成像的基本原理,提出利用DDS技术对转发信号实施移频调制,并根据需要产生不同特征的假目标干扰.在理论分析的基础上进行了仿真实验,仿真结果证明了这种方法的可行性.该方法可对一维和二维雷达成像进行干扰.     

A nuclear-armed North Korea without ICBMs: the best achievable objective

This article analyzes the North Korean nuclear crisis from a balance-of-power perspective. It is in the long-term interests of international peace for a secure and independent North Korea to serve as a buffer between US and Chinese ground forces. However, the conventional military advantage of the South Korean-American alliance over North Korea has grown drastically since the end of the Cold War, threatening North Korea’s survival. Since North Korea lacks any reliable ally, nuclear weapons represent its most cost-effective way to restore a balance of power and thus secure itself. Accepting security guarantees in exchange for its nuclear arsenal is rhetorically appealing but not a viable approach. North Korea’s development of intercontinental ballistic missiles (ICBMs), however, has overcompensated for the post-Cold War imbalance, inviting talk in Washington of waging a preventive war. Persuading North Korea to give up its ICBM capability, not its nuclear arsenal, should therefore be the primary objective of US diplomacy.     

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     

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。     

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。     

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。     

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。     

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。