基于SVM车型识别系统的设计

车辆自动识别分类技术是智能运输系统的重要组成部分,它对特定地点和时间的车辆进行识别和分类,并以之作为交通管理、收费、调度、统计的依据.要实现我国公路收费自动化、管理规范科学化,车型自动识别方法的研究势在必行.本文研究基于车型图像代数特征的车型识别方法.该方法首先利用背景差分法从背景图像中提取出运动车辆,并对车型图像进行预处理,然后采用特征并行融合的方法即用PCA方法,最后通过支持向量机分类器进行车型识别.     

水声目标特征分析与识别技术

水声目标识别技术是水下信息获取和水下信息对抗的重要支撑技术,其核心是目标特征提取。文章针对水声目标辐射噪声和目标回波信号,探讨总结了水声目标信号的主要声源及目标特征表征、水声信号特征分析与提取方法、常用的水声目标分类识别方法,分析了水声目标特征提取与识别技术面临的问题,提出了今后的技术发展方向。     

基于聚焦检测的轨道交通故障网络特征识别

轨道交通网络配网调度管理中,需要对交通网络的故障特征节点进行准确检测和识别,实现故障排除和诊断的目的。传统方法中,对轨道交通的故障网络特征识别采用模糊前馈神经网络识别方法,容易使得故障节点边缘化,特征识别性能不好。提出一种基于干扰伪峰聚焦检测的轨道交通故障网络特征识别方法,首先进行轨道交通故障网络模型构建与信号提取,对故障信号进行数学模型构建,实现对故障特征的有效提取,计算控制中心采集到的故障网络宽带波动信号的指向性增益。采用二阶累积算子对故障信号的干扰伪峰进行后置聚焦,实现对干扰伪峰的滤除,提高对轨道交通故障网络的特征识别性能。实验结果得出,该算法具有较好的轨道交通网络组网和故障检测识别能力,识别率较高,优越性明显,具有较高的实用价值。     

常用通信信号的调制方式识别研究

信号作为现代先进传输载体,能够在有线的信号通道里进行传输,可是没有办法实现无线信道传输。因此,如果想实现信号的无线传输,需要借助调制解调设备和相应技术,通过调制以后完成传输。在这个过程里,有关许多复杂干扰下的识别,属于常见的识别方法。随着通信技术日趋完善,原有的信号调制方式不再单一,呈现多样化特点,像我们平日生活里的诸多需求不能依靠传统识别办法来解决,于是关于新型信号识别的研究遇到了挑战,通过介绍统计模式的识别方法、决策模式的识别方法的分析,研究其优缺点,进一步阐述共信道多信号与非理想信道的调制方式的识别。     

一种基于多层BP神经网络面部表情识别方法

人脸表情识别是指通过面部表情特征的计算,实现表情的分类.研究了基于面部运动特征的表情识别方法,提出基于神经网络的表情识别方法.该方法提出一种基于多层BP神经网络进行表情分类的方法,其特征提取利用脸部运动编码系(FACS)进行;训练BP网络作为依据运动特征进行表情分类的判别方法.实验表明分别时上下半边脸的运动单元(AU)进行训练和测试,取得了较好的识别效果.     

无人机故障元数据属性分类与识别技术

传统方法在对无人机故障进行识别时,未对无人机故障进行有效分类,使得无人机故障识别结果差,应用性不高。为此,本文引入诊断分类树状模型对无人机故障元数据进行分类,解决传统方法中存在的问题。分析无人机故障元数据特点,在此基础上完成诊断层分类,获得对象层、故障层、征兆层、测试层、现象层及原因层6种不同的元数据属性类型;建立诊断分类树状模型对上述的元数据属性类型分类,获得统一格式为CML类型数据;依据雷达天线信息采集相关无人机故障元数据,根据左右识别及判断脉冲点方法完成元数据属性瞬时识别过程;获取最终的数据单元,实现无人机故障元数据属性的精确识别。实验结果表明,研究的技术能够精准地识别到故障元数据属性,并对其分类,分类处理所需时间短,该技术具有很高的发展空间,对于保障无人机安全运行有重要意义。     

通过特征提取和聚类实现对信号分类的研究

在当前信息信号获取和判别的相关技术迅速发展的背景下,人们根据信息的所具备的特征对其实现提取并开展分类的研究,目的是为了准确判别目标信息所对应的具体事物或者身份特征,从而开展信息的深入分析和处理工作。信号分类研究中有很多技术方法,依据不同的分类要求和信息分析需求,技术人员要进行科学、合理的选用,用来完成相应的分析任务。本文主要对特征提取以及聚类实现在信号分类中的具体作用和应用情况进行分析。     

一种改进半监督学习的图像语义自动识别方法

针对大量不相关的冗余特征制约图像关键特征分类性,导致语义识别模型出现偏差的问题,提出一种混合约束的半监督图像语义特征选择方法。在半监督学习的基础上,算法采用成对约束和数据清洗相结合的特征评价方法快速去除不相关图像干扰特征,聚类过程中考虑可转换语义直接的特征相关性,保证语义特征正确。实验结果表明,与传统的语义特征识别方法相比,该方法能以更少的特征获得更好的语义特征分类性能,有更好的识别效果。     

基于T-S模型的火电热控制稳定性问题研究

电厂热工过程与其它工业过程在特征方面具有本质意义的不同,热工过程中的动力装置和内部过程具有复杂性的特点,使得火电热过程通常具有非线性、不确定性、信息不充分性的特征,传统控制方法无法达到理想的控制效果,控制稳定性较差。提出一种基于T-S模型的热工信号无关干扰下的火电热控制稳定性分析方法,采用自适应滤波器的最小均方误差算法对热工信号无关干扰进行过滤,获取期望热工信号。分析T-S模型的基本思想,依据T-S模糊模型设计火电热模糊控制器。依据Ly-apunov理论实现火电热控制稳定性的分析。实验结果表明,采用所提方法的火电热控制稳定性较高,所需时间较短。     

无线信号自动识别算法的仿真实现

首先对比Hilbert变换构建的解析信号进行时频分析的方法,探讨了基于决策理论的模拟调制方式识别方法。然后在分析该方法缺陷的基础上,提出了基于神经网络的识别方法。神经网络(NN)在进行信号识别时,主要是依据谱峰位置的不同,小波变换在这里则相当于一个数学显微镜,反映信号类别与谱峰位置间的必然联系。利用小波变换并结合简单的三层BP神经网络,即可提取更加精确的待识别信号的时频特征。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence     

Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels

<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese     

More than Skin Deep – Understand Skin Biology by Means of Dermatogenomics

<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages.