Research on the Traffic Event Discovery in Video Surveillance

视频监控系统的广泛运用，为人们在交通管理和安全监督提供了很大的便利，然而这种便利需要耗费巨大的人力物力去干预和监督。随着科学技术的发展，视频监控系统智能化成为解决该问题的研究方向，但是目前针对异常事件发现的视频监控系统智能化仍不足以满足人们的需求。本文在实验室前课题组研究智能视频监控技术的基础上，研究道路交通事件检测技术并构建了一个道路交通事件检测系统。本文的主要工作如下： (1)介绍视频处理中比较常用的运动目标检测方法并在不同场景下对检测效果进行比较，采用了效果较好的混合高斯模型。在阴影检测算法中，通过统计阴影区域像素在的变化用高斯分布进行建模，从而根据概率大小完成对阴影像素的判断。在对运...Video surveillance systems that are used widely can provide people with a great convenience in traffic management and safety oversight, however, this convenience takes enormous human and material resources to intervene and supervise. With the development of science and technology, intelligent video surveillance system is a good solution to solve that problem, but the intelligent video surveillance...学位：工学硕士院系专业：信息科学与技术学院_计算机科学与技术学号：2302013115315

人眼状态跟踪系统

在驾驶员疲劳检测中,基于PERCLOS~[1](percentage of eyelid closure)的疲劳检测方法是最实用和可靠的,该方法的关键点就是对驾驶员眼睛的状态进行实时、准确的跟踪。本文提出了一种新颖、简单的人眼状态的判别算法,通过对人眼状态的几何特征进行分析进而判断人眼的睁闭状态,并以此为基础建立人眼状态跟踪系统

A Study on the Behavior of Risk-avoidance of Women Directors and Board's Promise——Evidence from Shanghai Stock Market

文章以我国2009-2013年度沪市发布社会责任报告的上市公司为样本,实证检验了女性董事对董事会是否对企业社会责任报告内容进行保证的影响(董事会保证)。研究结果表明,女性董事的确使得董事会的决策趋于保守,即当公司中有女性董事、女性董事的比例越高,董事会保证的可能性越低。文章进一步发现,当上市公司处于敏感性行业、非国有企业及环境不确定性程度高的公司时,女性董事对董事会保证的抑制作用显著增加,表明女性董事的风险规避特征是其影响董事会保证的主要原因。文章的研究结论不仅丰富了女性董事在公司决策中的作用研究,还有助于加深对我国企业社会责任信息披露行为的理解。The paper,taking social responsibility reports released by the listed companies in Shanghai Stock Exchange from2009 to 2013 as the sample,empirically tests the impact of female directors on whether the board is willing to ensure thetruthfulness of social responsibility reports(board's promise). The results indicate that female directors have a significant nega-tive impact on board's promise,namely the existence of female directors and the ratio of female directors in the board are sig-nificantly negatively correlated with board's promise. The further analysis finds that the negative impact of female directors onboard's promise is stronger for the listed companies which are in industries with high CSR concern,non state-owned enterpris-es and high environment uncertainty,which indicates that the characteristics of risk-avoidance of female directors are themain reason that affects board's promise. The conclusions of this study not only enrich the related literature on the role of fe-male directors in corporate decision-making,but also help to deepen the understanding of the behavior of corporate social re-sponsibility information disclosure.国家自然科学基金重点项目(71532012);国家自然科学基金项目(71102058;71102059

Media Coverage, Voluntary Disclosure of the Corporate Social Responsibility Information and Financing Constraints

以我国2009~2013年度除强制性披露社会责任报告外的非金融类上市公司为样本,实证检验了媒体关注度对企业自愿性社会责任信息披露意愿以及披露水平的影响。研究发现:媒体关注显著提高了企业自愿性社会责任信息披露意愿及其水平,而企业自愿披露社会责任信息能显著缓解公司面临的融资约束。在尽可能控制内生性问题后,研究结论依然成立。本文的研究在丰富了已有的媒体作用文献的基础上,加深了公众对我国企业社会责任信息披露行为的理解。Taking non- financial listed companies excluding firms with mandatory disclosure of social responsibility report as samples for the period 2009~2013, this paper discusses the relationship among media coverage, voluntary disclosure of the corporate social responsibility information and financing constraints.Our results indicate that media coverage really promote the enthusiasm of voluntary corporate social responsibility information disclosure and the corporate social responsibility information can reduce financing constraints the enterprises faced and the conclusions still hold after eliminating the endogenous concerns.This paper not only enriches the related literature, but also helps deepen our understanding of the behavior of corporate social responsibility.国家自然科学基金青年项目(71172050);国家自然科学基金项目(71102058);国家自然科学基金项目(71102059);国家自然科学基金项目(71572165

Does Capital Market Protect Public Health——An Empirical Study on Liquor Plasticizer Event

本文以2012年末的“白酒塑化剂事件“为背景,首次实证检验了中国A股资本市场对生产和销售问题食品企业的惩戒效应,并进一步检验了市场反应的有效性。实证发现:第一,塑化剂事件期间白酒上市公司股票市场具有显著为负的市场反应,并对生产工艺相似的黄酒上市公司股票表现出了显著的“传染效应“,而对其它酒类上市公司股票影响不明显。第二,不同档次的白酒上市公司股票受该事件冲击的市场反应存在显著差异,进一步地,每一家白酒上市公司股票对该事件的市场反应也存在显著差异。以上证据表明,我国资本市场不仅对问题企业发挥了惩戒效应,而且其定价机制也是基本有效的。本文的研究不仅丰富了已有的市场反应研究文献,还有助于加深对我国投资者行为和市场定价机制的认识。Taking Liquor Plasticizer Event as the research background,this paper discusses the disciplinary effects of capital market in mainland China on the act of producing and selling unsafe food.Our results indicate that capital market severely punish Liquor-making enterprises and market reaction of yellow wine enterprises also show a significant negative returns during the period of Liquor Plasticizer Event.Further study identified the incident has different degrees of impacts on different portfolios of Liquor listed companies and different Liquor listed companies.The policy implication of our findings is that market power helps remedy the irresponsible firm behavior and the market pricing mechanism is roughly effective.This paper not only enriches the literature on market reaction,but also helps deepen our understanding of the behavior of investors and the market pricing mechanism in China.国家自然科学基金项目(71102058);国家自然科学基金项目(71102059);国家自然科学基金项目(71172050

Does the CCTV Interview with CEO or Chairman Affect Stock Price?:An Empirical Analysis of the Effect of Investor Attention on Stock Price

【中文摘要】随着新闻媒体的迅速发展，当前经济社会出现的信息富裕问题引发了注意力的稀缺问题。受制于注意力的有限性，投资者在投资决策过程中，如果有大量可获得的信息，有限关注不可避免。本文选取2010～2012年中国A股上市公司首席执行官（chief executive officer，CEO)、董事长接受央视采访这一特殊样本，有效地把信息从关注中分离出来，从而对关注与投资收益的关系进行研究。同时也对关注如何影响资产价格的影响机理进行了分析。利用电视采访数据和相关上市企业财务数据进行实证分析，本文发现，投资者会因为关注而产生注意力驱动交易行为，在事件日产生了显著为正的累计超额收益率并在其后反转，异常交易量出现显著变化并且与超额收益趋势大致相同。同时还发现，采访报道时长、节目播放时段以及事件日的顺延均会影响投资者关注行为，而节目频道和被采访人特征对投资者关注行为并无影响。 【Abstract】With the rapid development of news media， the information overloading problem in an economic society causes the attention scarcity problem. Restricted by limited attention， investors have to selectively process information in making investment decisions. The paper utilizes a sample of CCTV interviews with CEO or Chairman of China's A-Share market listed companies between 2010 and 2012，which effectively separates attention from information. We use this sample to study the effects of investors’ attention on stock price and analyze the channels through which investor attention affects prices. We find attention-driven trading behavior among investors. Specifically，there are significant positive cumulative abnormal returns on the event day，but the abnormal returns subsequently reverse and eventually become significantly negative. The pattern of abnormal trading volumes follows closely that of abnormal return.. In addition， we find that the length of the interview， the broadcasting time slot of the interview，and the extension the event period affect the effects of investors’ attention on prices， whereas broadcasting channels and the characteristics of the interviewee do not.国家自然科学基金项目“媒体治理：转型国家投资者保护的补充机制研究”（71172050

Microfluidic chip-based high performance liquid chromatography coupled to mass spectrometry method for small molecule analysis

Microfluidic chip-based high performance liquid chromatography coupled to mass spectrometry method for small molecule analysi