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为提高二次雷达(Secondary Surveillance Radar,SSR)信号分析处理能力,针对傅里叶变换在时频域分析的局限性,利用小波信号奇异性检测特点,通过对S模式询问、应答信号进行小波分解,计算第一层高频系数,得到信号脉冲持续时间,实现了信号报头检测,并比较高频系数模极大值,提取出信号调制信息,实现了基于小波变换的二进制差分相移键控(DPSK)和二进制振幅键控(ASK)解调,验证了小波变换技术分析处理二次雷达信号的可行性。 相似文献
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Robert DeFillippi Michael Arthur Polly Parker 《International Journal of Human Resource Management》2013,24(5):751-767
This paper examines a new kind of career odyssey, namely that into the relatively uncharted territory of the world wide web. It extends recent ideas about personal and communal career investments by exploring people's web-enabled career behaviour, based on Tapscott et al.'s (2000) typology of web roles. MBA students completed a preliminary career exploration instrument and then met in different focus groups according to the web role with which each student most identified. The reported career investments varied depending on the web role involved. An attempt was made to corroborate these findings through practitioner interviews, but there were problems in reconciling the two kinds of data. The implications of these findings are discussed, and a series of observations is offered concerning the further study of the increasingly virtual journeys anticipated for careers of the future. 相似文献
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Mark Tadajewski 《Journal of Marketing Management》2016,32(1-2):1-18
In this paper, we engage with the rising importance of journal ranking lists. We explore the pressure these place on marketing academics and the politics of knowledge production, stressing academic game-playing, careerism, and paradigmatic homogeneity. We appreciate that scholars are disciplined by these lists, their line managers, and reaffirm list power through their own patterns of self-management. Nonetheless, marketing academics should avoid making the naïve assumption that the appearance of a paper in a highly rated journal necessarily serves as a proxy for ‘quality’. Publication in a particular outlet does not transform the ultimate contribution being made in any substantive fashion. We provide an extensive critique of the function and impact of journal lists. However, it is also recognised that these are very important for members of the marketing community. As such, we explain our reasons for contesting the recent regrading of the Journal of Marketing Management (JMM) by a prominent journal list and underline the changes that have been made to the Journal since the beginning of the current editorial term. Finally, the support of prominent scholars among our thought community for the policies being implemented is highlighted and we underscore the rigour of contributions to the Journal, the review process, the rising citations, downloads and truly global readership of the JMM. 相似文献
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高校辅导员工作专业化是提高大学生思想政治教育成效、促进大学生健康成长成才、为大学生提供高效服务的现实需要,也是辅导员自身发展的迫切要求.通过分析高校辅导员工作专业化的内涵和基本特征,深入探讨了高校辅导员工作专业化发展所面临的现实困境和深层次原因,并从制度建设、管理体制、运行机制三个层面回答了专业化是高校辅导员工作的路径依赖. 相似文献
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In this paper, we examine the career histories of the chief executive officers (CEOs) affiliated with the 500 largest organizations in Europe and the 500 largest in the United States. Our purpose is to determine whether frequent career moves across employers, a phenomenon we label an “external labor market strategy,” brings greater career rewards than moves inside the same organization. The results reveal that an external labor market strategy is negatively related to career success. On both continents, CEOs who have spent a smaller fraction of their career in their current organization or have changed employers more often have taken a longer time from the start of their career to be promoted to the most influential corporate positions. The labor market institutions in the 22 countries sampled do not influence the relationship between an external labor market strategy and career success, while the specific geographic region in which the employers are located has a limited impact on this relationship. © 2009 Wiley Periodicals, Inc. 相似文献
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为了解决当环境噪声较严重时光强难以维持稳定,容易误判目标光缆问题,根据干涉信号非线性、非平稳的时域特征,提出了一种希尔伯特-黄变换及主成分分析相结合的信号处理方法。探测器接收的干涉信号对进行经验模态分解,把分解得到的本征模态分量作为列向量构建主成分分析的样本矩阵,以奇异值的贡献率进行有效成分筛选;然后采用主成分分析算法完成降噪优化。最后将降噪后的信号进行希尔伯特-黄变换得到瞬时特征信号,完成目标光缆识别。结果表明,相同噪声环境下所提方法可有效提高回波干涉信号的信噪比。因此,研究结果可以降低误判目标光缆的概率,帮助工程人员更有效地完成光缆识别。 相似文献