ADC量化位数对阵列天线GNSS接收机的影响

在处理全球卫星导航系统（Global Navigation Satellite System,GNSS）卫星信号时,针对模数转换器（Analog-to-Digital Converter,ADC）量化位数不同导致输出的信号信噪比下降的问题,推导了阵列天线波束形成后输出信号的信噪比理论计算模型,分析了ADC量化位数对阵列天线抗干扰GNSS接收机的性能影响。在7阵元天线且ADC量化位数为10的条件下,理论模型分析和数据仿真结果表明最大抗干扰能力约为85 dB。通过确定ADC量化位数与抗干扰GNSS接收机抗干扰能力之间的关系,其结论为工程应用中抗干扰GNSS接收机的ADC选型和设计提供了理论依据。     

面向卫星导航信号的外辐射源雷达软件化模拟器设计

面向全球导航卫星系统(Global Navigation Satellite System,GNSS)信号的外辐射源雷达,是一种利用环境中GNSS信号作为非合作照射源进行探测的雷达。为满足基于GNSS信号的外辐射源雷达系统仿真和信号处理算法设计评估的需要,通过对该雷达系统组成与工作原理的分析,完成了面向GNSS信号的外辐射源雷达软件化信号模拟器的设计与实现。给定仿真场景下软件化模拟器输出信号处理和分析的结果验证了该模拟器可根据输入参数与模型正确完成信号仿真。     

机器类设备基于不同时延需求分组的随机接入方法

针对大规模机器类通信中拥塞导致的时延敏感设备时延高和接入成功率低的问题,提出将小区中设备按时延要求分组,对不同组设备引入不同的退避模型,分析时延敏感设备的时延和吞吐量,按照不同组中设备的时延需求动态分配前导数目,同时通过调整接入类限制因子实现吞吐量的优化。仿真结果表明,在给定时延敏感设备的时延限制条件时,与统一退避的机制对比,所提分组机制的时延敏感设备能够满足时延要求,并且提高了接入效率。     

Predictable irrationality in managerial accounting: Does knowledge overcome cognitive biases of undergraduate students?

Managerial accounting teaches students to make rational decisions by evaluating sunk costs, incremental costs, and opportunity costs. The behavioral literature suggests that biases and heuristics overcome rational thinking. The authors explore whether learning cost concepts attenuates behavioral biases. They find a statistically significant proportion of students completing a managerial accounting course exhibit predictable irrationality in personal choices. By matching behavioral choices with final exam answers, the authors also find that learning rationality principles in accounting does not reduce predictably irrational choices in other settings. The study findings are robust across three key rational concepts. Overall, the authors cannot reject the hypothesis that behavioral choices are independent of knowledge of the underlying principle of rationality.     

“Do You Use English in Your Daily Life?” Undergraduate Students’ Perceptions of Their Extramural Use of English

The aim of this research is to analyse the students’ perceptions about their extramural use of English, comparing undergraduates studying their degree in English (EMI) with those studying theirs in their native language (non-EMI) within a span of five academic years. Data collected from a Spanish University suggest that the students´s interest and perception of their possibilities of working abroad in English differ. Results also reveal key differences in the use of extramural English and suggest that exposure to reading books or watching English-language films will eventually contribute to the formation of global mindset in students. The trend of the importance of English during a five year span is also considered, for both strands of students. This study makes a contribution in the field of teaching in international business settings for high education institutions.     

The dramatic breakdown of the market orientation concept in the pharmaceutical industry: lessons from Vioxx

In this article we present an in-depth case study to better understand the underlying market orientation concept in relation to bringing new technologies to the marketplace. We use the case history of the anti-arthritis drug Vioxx, developed and marketed by the company Merck & Co. Inc that allegedly killed thousands of customers. The case shows how market orientation can take shape and how the key components may form an explosive cocktail prone to problematic behaviour rather than a synergistic set of orientations that creates value for customers. From the data covering 20 years, it is clear that a consumer orientation and competitor orientation, for example, are difficult to internalise and balance by employees. A competitive orientation seems to lead to tunnel vision regarding profit and market share outcomes. Implications for the fundamental market orientation concept, innovation management, together with management challenges are discussed.     

贸易便利化能否通过贸易创造促进省际贸易——来自中国贸易便利化调研的证据

本文使用能够由企业判断反馈的、具有省域区分度的变量,通过问卷调查测度了中国的贸易便利化水平,并在此基础上使用开埠通商历史作为工具变量,从贸易创造和贸易转移的视角,用引力模型实证研究了贸易便利化对中国各省份国际贸易和省际贸易的影响及其作用机理。结果显示,在控制关税等因素的情况下,贸易便利化水平的提升能够大幅提升我国各省份的对外贸易;不同地区贸易便利化作用的差异也揭示了我国对外开放的节奏和效果;虽然贸易便利化会带来贸易转移效应,短期抑制省际贸易,但是它能够通过国际贸易促进省际贸易,从而提高国内经济相互融合的水平。     

Advertising targeting young children: an overview of 10 years of research (2006–2016)

A review of 138 published academic articles was conducted to provide an up-to-date and comprehensive overview of academic research of the past decade (2006–2016) on advertising directed to young children up to 12 years old. The research overview resulted in a conceptual framework comprising five research domains that were found to be most prominent. For each of these five domains, an overview, discussion and future research agenda is presented. We conclude that much of the research of the past decade included food advertising and its effects. Progress has been made in the domain of children's advertising processing, specifically with regard to advertising literacy. Despite the growing importance of embedded advertising, many of the new ad formats remain neglected (e.g. native and mobile advertising). Additionally, only a few studies investigated which executional factors (e.g. humour) are effective in advertisements to target children and social influences are also less often considered.     

Beyond merger syndrome and cultural differences: New avenues for research on the “human side” of global mergers and acquisitions (M&As)

This paper focuses on research on the “human side” of global mergers and acquisitions (M&As). We argue that there is a need for a more fine-grained understanding of the “human side,” which requires conceptualizing M&As as practice-oriented processes. Drawing on the practice approach, we outline avenues for further research on the “human side” of global M&As. The research directions include (1) multilayered identity dynamics, (2) emotional processes, (3) participation and change agency, (4) resistance, (5) human resource management (HRM) practices and tools, and (6) new forms of communication.     

融合改进FT显著性与Grabcut的图像目标分割算法

针对目前复杂度较大的图像中目标分割速度较慢、显著性边界分割不明确等问题,提出了一种融合改进的FT（Frequency-tuned）显著性检测与Grabcut的图像分割算法。该算法首先通过改进基于频率调谐的FT显著性检测方法得到图像中显著性较高的区域,并利用SLIC（Simple Linear Iterative Clustering）算法对显著图进行预处理得到超像素图,能够有效改善边界的分割效果,然后通过以图论GraphCut算法为基础改进的Grabcut算法建立高斯混合模型。为了提高算法效率,通过聚类以超像素代替原像素,并反复迭代高斯混合模型（Gaussian Mixed Model,GMM）参数,最后利用最大流最小割算法得到最优目标分割结果。实验结果表明所提算法能够更准确更高效率地分割图像中的显著性目标,对高分辨率图像也有很好的适用效果,相比于其他算法在分割精度上提高10%左右,并具有较高的分割效率。