雨后冲刷后罪犯残缺指纹痕迹检验及细节增强方法研究

指纹识别是生物特征识别方式中的一类,它已经成为验证身份最为有效的方法之一。因此文中利用该技术对雨后冲刷后罪犯的残缺指纹进行检测,提出基于残缺区域方向的指纹重建方法。首先,针对指纹残缺区域范围中存在脊线中断和细节特征点缺失的情况,先利用融合邻域中的细节特征点和指纹方向信息对指纹残缺部分进行预估,通过先知经验结合预估方向对指纹预估部分进行脊线修补,同时引进信息熵确定指纹重建修复最佳方案;然后,对于指纹残缺的奇异部分,根据指纹纹线存在固定方向和频率的特性,对其局部指纹图像进行时频分析,采用概率统计方式对纹线频率值范围进行判定,构造频域滤波器实现带通滤波从而达到对指纹细节增强的目的。实验证明,运用文中指纹重建法对残缺指纹进行了有效检验及细节增强。     

高效液相色谱法构建黄连上清丸指纹图谱

高效液相色谱法构建复杂中成药黄连上清丸的HPLC指纹图谱.方法首先对实验的方法学进行评价,证明方法精密可靠;用此方法构建了12个样品的图像式指纹图谱;进而构建数字化指纹图,并改进了原有数字化指纹谱的表现形式,使样品间的量化比较一目了然.结论:从图象式指纹谱上可以直观地判断不同样品共有峰的含量差异比较显著,这是由于原料、加工过程等多种因素引起.在数字化指纹谱中,通过对各种参数进行评价,证明每个厂家都按规定投入了十七味原药材,而药材的品质以及药材的投入量却有显著差异.HPLC法构建的黄连上清丸指纹图谱结果有效可靠,该方法可用于其他不同厂家不同批次的制剂控制与评价参考.     

指纹识别的分割算法实现

研究了一种指纹图像的预处理方法,结合指纹的结构信息对指纹图像进行了处理。包括图象分 割、方向图、二值化等,并给出了实验结果,其结果表明这是一种有效的算法。     

指纹识别的分割算法实现

研究了一种指纹图像的预处理方法,结合指纹的结构信息对指纹图像进行了处理.包括图象分割、方向图、二值化等,并给出了实验结果,其结果表明这是一种有效的算法.     

基于分数傅里叶变换的数字水印技术

文章研究了一种离散分数傅立叶变换（DFRFT）域的图像水印方法。该算法根据分数傅里叶变换谱具有空域和频域双域信息表达能力,对水印载体图像进行某个级次的分数傅立叶变换,并将加密水印嵌入到载体图像的分数傅立叶谱中。仿真结果表明该算法对诸如JPEG压缩、高斯噪声干扰和图像剪切等图像处理均具较好的鲁棒性。     

过度曝光图像缺失信息修复算法

图像在过度曝光采集的情况下会因为光圈的进光量过大导致图像的细节关键信息缺失,研究过度曝光图像的缺失信息修复算法,为图像的细节特征分析奠定基础。传统方法采用图像小波尺度分解方法进行图像缺失信息修复,随着光圈的增大,对细节信息的修复效果不好,提出一种基于改进的小波包分解的过度曝光图像缺失信息修复算法。构建了过度曝光图像的纹理信息特征传导模型,采用Harris角点检测算法实现对过度曝光图像的灰度特征匹配,采用小波包分解方法对图像缺失信息进行位置和尺度信息的重构,实现缺失信息修复。仿真结果表明,采用该算法进行过度曝光图像修复,图像的细节特征得到准确有效复原,提高图像的识别能力。     

一种基于泳道数据流图的数据需求分析方法

信息技术的飞跃发展,使得部门间、层级间的数据共享与交互呈现指数级的增长,基本形式的数据流图也不能充分的挖掘和表达复杂的网络化的信息系统数据需求,本文结合泳道流程图和数据流图两者的优势,提出了一种有效的基于泳道数据流图的数据需求分析方法。     

基于分数傅立叶变换的图像数字水印算法研究

以静止图像为研究对象,文章提出了一种离散分数傅立叶变换（DFRFT）域的图像数字水印算法,该算法通过对载体图像进行某个级次的分数傅立叶变换,将加密水印嵌入到载体图像的分数傅立叶谱中,从而得到含水印的图像。实验结果表明,该算法实现了水印图像的不可见性,同时对常见的图像攻击具有较好的鲁棒性。     

基于小波变换的数字图像水印算法的研究

提出一种猫脸（Arnold）置乱方法进行加密,以增强水印系统的安全性,再将载体图像进行小波多分辨率分解,由于嵌入低频子带的水印容易被提取,高频子带水印的鲁棒性不好,所以提出在宿主图像小波域的中频子带的适当系数嵌入水印信息,以达到优势互补。水印的嵌入采取量化调制的方式,使水印实现盲提取。     

指纹细节特征提取算法的优化研究

指纹细节特征提取是指纹识别的前提。提出了一种改进的基于细化图像的指纹细节特征提取方法,该方法首先在二值细化图像上提取细节点,对于各种原因产生的伪特征,根据其拓扑结构,结合二值形态学操作,分别采用不同的后处理规则予以剔除,然后将后处理得到的细节点集放到原始指纹灰度图像上去检验以进一步提高细节点的准确性,最后在FVC2002DB1上的对比实验验证了该方法的有效性。     

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.