空基与星基组合监视系统中的ADS-B分群算法

广播式自动相关监视(ADS-B)技术是未来航空监视技术的发展方向之一.为了满足未来空域中移动节点快速多变以及覆盖范围不断扩大等的监视需求,需要将甚高频自组织数据链和卫星数据链综合实现空基与星基组合监视系统,而分群是实现该系统的一种有效手段.为此,文中提出了一种新型的ADS-B分群算法,通过结合最大连通度准则和非确定性算法,改进了分群组网结构,提高了组网的初始收敛速度、网络整体结构的稳定性以及通信效率.     

On the efficiency of indirect taxes in differentiated oligopolies with asymmetric costs

This paper shows that unit taxation can be welfare superior to ad valorem taxation in asymmetric and differentiated oligopolies if the goods are sufficiently differentiated, the cost variance is sufficiently large and the ad valorem tax rate is sufficiently high. Moreover, this result holds under either Cournot competition or Bertrand competition.      

基于SCPS协议的快速自组织可重构天基信息网组网

根据快速自组织天基信息网的特点,设计了组网模型,分析了所需协议的结构,提 出了基于空间通信协议规范（SCPS）协议的快速自组织天基信息网的组网抗毁策略,优化了 天基信息系统运行效率 ,提高了其生存能力。     

移动AdHoc网络中的TCP改进技术

近年来，有关移动Ad Hoc网络的关键技术研究已经取得了很大的进展，如何有效地提高其网络性能仍然是目前研究的热点问题。本文结合这种网络拓扑动态变化、路由易发生改变的特点，分析了传统TCP协议在应用上遇到的挑战，并从两个途径研究了针对TCP技术的各种改进方案，同时提出了今后可能的研究方向。     

Evaluative and factual ad claims,knowledge level,and making inferences

A lab study examined the effect of type of ad claim (factual versus evaluative) and knowledge level on subjects' product feature inference making from three camera ads. Each ad had some missing brand information. The results showed that as knowledge increased, so did inference making. Also, there was a significant interaction between ad claim and knowledge. Inference making was positively correlated with knowledge level for factual ads but not for evaluative ones. Finally, subjects made very few inferences to fill in missing ad features but instead did more interpretive processing.     

基于不同节点移动模式的无线自组网路由协议性能分析

本文采用NS2网络仿真软件,随机建立包含100个节点的网络拓扑,在节点静止、缓慢移动和快速移动条件下,分别对AODV、DSR和DSDV三种路由协议的数据包端到端时延、抖动和吞吐量的变化趋势进行比较分析。仿真结果表明,在网络规模较大且网络拓扑变化不频繁的情况下,DSDV具有一定的优势;在网络规模较大且网络拓扑多变的情况下,AODV和DSR性能明显优于DSDV。     

基于节点负载等级的自组网AOMDV路由协议改进方法

为了增强自组网AOMDV路由协议的负载均衡能力,根据队列缓存比将网络中节点分为2个等级Normal和Danger,针对不同等级进行不同的处理.对Danger级节点直接弃用,对Normal级节点通过阈值比较赋予相应的虚拟跳数,队列缓存比越高则相应的虚拟跳数越高.对RREP和Hello报文进行了拓展,均加入了节点队列缓存比...     

Ad creativity in a negative context: How a thanking message frame enhances purchase intention in times of crisis

Traditionally, advertising relies on creativity to increase its effectiveness. However, little is known about the use of creativity in negatively-valenced situations. For instance, in times of crisis such as the COVID-19 pandemic, how should retailers engage in advertising? Should they strive to deliver creative advertising, or not? We investigate the role of ad creativity during times of crisis, based on 43,459 consumer responses to 49 retail and service brand ads. To do so, we investigate the separate effects of the two dimensions of ad creativity: originality and appropriateness. Results indicate that creativity works differently in a crisis context, with originality and appropriateness having different effects on consumers. Further, we find that originality and appropriateness trigger emotions in opposite ways. However, ads that engage thanking - be it of employees, customers, or frontline emergency workers - strengthen these effects.     

Warmth or competence: Brand anthropomorphism,social exclusion,and advertisement effectiveness

This paper examines how social exclusion moderates the role of brand anthropomorphism in advertisement effectiveness, its underlying mechanism, and its boundary conditions. Specifically, we propose that rejected (vs. ignored) consumers are more likely to purchase brands advertised as warm (vs. competent) through decreased (vs. increased) need for uniqueness. Additionally, product type moderates the effect of brand anthropomorphism, such that rejected (vs. ignored) consumers prefer warm (vs. competent) brands only for products with high safety levels; for less safe products, consumers tend to purchase competent brands, regardless of the state of their social exclusion. We empirically test this hypothesis across four studies that use different operationalizations of social exclusion. We conclude by discussing our contributions to the literature on brand anthropomorphism and social exclusion.