基于PSO-SAS的联合侦察任务规划

针对联合侦察筹划中任务规划阶段机动侦察平台阵位与路线确定困难的问题,提出了一种基于粒子群优化-稀疏A星(Particle Swarm Optimization—Sparse A-star,PSO-SAS)算法的规划方法。该方法综合考虑侦察装备机动性能以及敌火力威胁、地形等因素,在侦察阵位规划上,建立了阵位综合评估模型,并利用粒子群算法进行阵位寻优;在路线规划上,采用稀疏A*算法进行航迹规划,通过将机动性能、安全距离、路程等约束引入搜索过程,缩短最优路线的计算时间。仿真试验验证了所提方法生成的侦察阵位和路线能够满足侦察任务要求。     

When do MNCs fail to learn from prior failure experience?

Do multinational corporations (MNCs) learn from their prior failures in international joint ventures (IJVs)? When does decision makers’ cognitive inability hinder MNCs from learning through their prior failure experiences? In the context of IJV survival in subsequent IJV entries, this study compares predictions made from two distinct theoretical perspectives, both of which belong to the behavioural school in strategy literature. According to the performance feedback perspective, MNCs may effectively learn from their prior failure experiences gained in familiar decision‐making contexts. On the other hand, according to the cognitive bias perspective, MNCs may not be able to effectively learn from their prior failure experiences if they inaccurately interpret the causes of their prior failures. The results provide partial support for the notion that MNC decision makers may not be able to effectively learn from their prior failures because of their cognitive biases. Copyright © 2015 ASAC. Published by John Wiley & Sons, Ltd.     

认知网中感知时间和功率控制的联合优化机制

针对认知无线网中为了最大化认知用户的吞吐量问题,提出了一种感知时间和功率控制的联合优化机制。该机制保证认知系统在低于一定干扰限制下,将认知用户吞吐量描述成为一个多约束优化问题,从理论上分析了最优功率分配方案与最优感知时间分配方案。根据理论分析结果,设计了联合迭代机制通过确定合适的感知参数从而达到最大化认知用户吞吐量的目的。仿真结果表明：提出的联合优化机制复杂度较低,并且该方案的认知吞吐量性能最接近理论最优方案的性能。     

The impact of partner diversity within multiparty international joint ventures

Despite the significant role that multiparty international joint ventures (MPIJVs) play within multinational enterprises, we know little about the significant challenges associated with the management of these ventures. Therefore, we combine the Resource-based View of the Firm and Transaction Cost Economics to investigate the effects of the key aspects of partner diversity (i.e., variety, balance, and disparity) on MPIJV dissolution. We test our hypotheses using a dataset of 248 MPIJVs in China. We find empirical support for a U-curve shaped effect of variety and a negative linear effect of balance on MPIJV dissolution.     

美军分布式通用地面站系统的发展现状与趋势

作为美军情报接收、处理和分发的主要系统,近年来,分布式通用地面站系统（DCGS）在全球信息栅格(GIG)、云技术、大数据等新兴信息技术推动下取得了显著建设成果。简要介绍了美军各军种DCGS系统的项目进展,重点总结了空军DCGS-AF系统和陆军DCGS-A系统的发展现状及技术特性,包括DCGS-AF Block 10.2和DCGS-A 3.0 Griffin软件基线的架构和能力等,结合DCGS系统在伊拉克和阿富汗战场的作战应用分析了系统的未来发展趋势,以期为相关人员提供参考。     

低复杂度的连续相位调制与LDPC联合迭代译码算法

连续相位调制与低密度奇偶校验(LDPC)码编译码技术在提高频谱利用率的同时能够有效降低发射功率,然而这会增加通信系统的复杂度。为此,提出了一种低复杂度的联合迭代译码算法解决此问题。该算法以符号/比特的可靠度作为内外译码器之间的迭代信息。仿真结果表明,新的联合迭代译码算法的性能与概率域下的算法几乎没有差异,在总迭代次数相同的情况下,采用低复杂度联合迭代的性能相比于未采用联合迭代的性能有约0.75 dB的增益。     

SERIES EXPANSION OF THE SABR JOINT DENSITY

Under the SABR stochastic volatility model, pricing and hedging contracts that are sensitive to forward smile risk (e.g., forward starting options, barrier options) require the joint transition density. In this paper, we address this problem by providing closed‐form representations, asymptotically, of the joint transition density. Specifically, we construct an expansion of the joint density through a hierarchy of parabolic equations after applying total volatility‐of‐volatility scaling and a near‐Gaussian coordinate transformation. We then establish an existence result to characterize the truncation error and provide explicit joint density formulas for the first three orders. Our approach inherits the same spirit of a small total volatility‐of‐volatility assumption as in the original SABR analysis. Our results for the joint transition density serve as a basis for managing forward smile risk. Through numerical experiments, we illustrate the accuracy of our expansion in terms of joint density, marginal density, probability mass, and implied volatilities for European call options.     

基于联合概率加权的高分辨雷达目标点迹处理

针对高分辨雷达在跟踪扩展目标时出现多散射点的问题,提出了一种基于联合概率加权的雷达目标点迹处理方法。首先,对信号检测出的多散射点构建其残差变量,根据判别准则进行目标点迹配对处理,剔除异常散射点;然后,同时考虑散射点位置和回波幅度信息,计算联合概率的权值,目标多散射点经概率加权融合后估计得到散射中心。仿真分析表明,该方法在高分辨雷达扩展目标点迹处理中能有效抑制杂波的干扰,目标点迹精度在距离、方位和俯仰上分别提高了20.63%、47.51%和41.03%,同时具有很好的可靠性,满足工程应用的需求。     

Understanding IJV performance in a learning and conflict mediated context

Determinants of international joint venture (IJV) performance are examined within the context of cross-border learning. Using a structural equation model, we test the multifaceted interactions among strategic goal congruency, national culture differences, learning and conflict. Cross-border learning is recognized as a kernel variable which is influenced by matching strategic motives, national culture differences, and conflicting relations, and which affects the performance of IJVs. In particular, we hypothesize that interpartner goal congruency and national culture differences have an indirect effect on IJV performance through cross-border learning and conflict; previous studies established their direct relationship. The test results show that congruent strategic motives and cultural similarity had a positive effect on cross-border learning, which was reinforced by learning capacity, and which in turn led to better performance. Conflicting relations between partners and heterogeneous cultural backgrounds were shown to discourage cross-border learning.     

Conflict resolution strategies in joint purchase decisions for major household consumer durables: a cross‐cultural investigation

Previous studies on joint purchase decisions have investigated the types of conflict resolution strategies used by spouses, the usage frequency of different conflict resolution strategies, and the effects of demographics and various other variables, on the uses of conflict resolution strategies. Despite efforts to address this largely unexplored area, the role that culture plays in the use of conflict resolution strategies has been significantly ignored. Using a cross‐cultural perspective, this study addresses the gap in our understanding of the joint purchase decisions in the family by examining how husbands and wives of three ethnic groups in Britain – British Whites, Indians and African Blacks – use different conflict resolution strategies while jointly purchasing major household consumer products. The total sample comprised 583 husbands and wives of British White, Indian and African Black origin residing in London and Manchester in Britain. Our results showed that three conflict resolution strategies are used by both husbands and wives: bargaining, assertiveness and playing on an emotion. In addition, disengagement emerged as a strategy for husbands, whereas supplication emerged for wives. The study presented in this paper also provides substantial evidence of differences in the use of conflict resolution strategies by husbands and wives from the three ethnic groups, which greatly improves our knowledge on a cross‐cultural perspective of joint purchase decisions.