基于RSSI测距和三边定位技术的儿童实时定位算法

定位技术是无线传感器网络的重要技术之一,其中基于RSSI测距的定位技术以便捷、精确度高成为首选技术。文章为了实现对商场走失儿童的快速定位设计了一个基于RSSI和三边定位技术的实时定位系统。该系统利用4G网络进行定位请求,RSSI测距技术对未知节点进行测距,最后基于三边定位技术编写算法。该算法经过仿真实验精度完全符合要求。     

综放工作面顶煤冒放特征研究

综放开采技术的应用涉及到众多因素,是一个复杂的系统工程,对该领域的许多关键性技术,尤其是顶煤冒放性特征研究刻不容缓。     

电磁声发射技术研究

电磁声发射技术是近几年发展起来的一种无损检测新技术,可以用来对导电薄板进行损伤评价.该技术通过对被测物品的局部施加一个电磁场,使其产生声发射响应,从而对缺陷位置进行定位.文章首先介绍了电磁声发射技术的原理,然后用有限元法对电磁声发射技术的耦合场进行了分析,为该技术的实际应用奠定基础.     

网络扫描器的原理及设计模型研究

讨论了计算机网络扫描技术的理论基础,对当前网络扫描的主要技术——端口扫描和操作系统漏洞扫描的内在机制作了分类和阐述,并给出了一个网络扫描器的设计模型。该模型提出一个扫描策略决定器,集成现代流行的利用第三方主机扫描技术,有效提高扫描成功率。     

我国太阳能光热发电技术专利分析

在能源日益短缺和保护环境的要求下,利用太阳能光热发电已经成为一个重要发展方向,研究并推进该技术在我国应用具有重大的价值。本文从专利视角出发,对我国太阳能光热发电技术进行分析,利用专利数量分析、专利地图等方法,分析该技术所处的发展现状及趋势。     

图书馆电子资源整合技术探析

电子资源整合是当前图书馆信息化建设当中一个不可忽视的部分,它的质量会直接影响到图书馆建设和运行的质量,所以对图书馆电子资源整合过程中所使用到的技术进行探究也就成了一个十分关键的内容。笔者根据自己的实际经验对该技术进行简要的分析和阐述。     

技术方案的可拆分逻辑性分析在专利审查中的应用

本文从技术特征与技术效果之间的关系出发,分析了技术方案的可拆分逻辑性,若判定一个技术特征不能单独在本发明中带来或者产生一种技术效果,而必须结合其他技术特征共同作用才能带来或者产生一种技术效果,则说明该技术特征与其他技术特征之间存在某种关系而不可拆分;相反,若判定一个技术特征能在本发明中单独带来或者产生一个技术效果,则该技术特征与其他技术特征之间不存在某种关系而可以拆分。本文通过实际案例进行了具体应用说明,以有助于提高检索和审查效率。     

测算企业技术进步经济效益的新方法研究

本文根据马克思再生产理论，建立了一个新的测算企业技术进步经济效益的模型，该模型思路清晰，计算简单。使用该模型不仅可以测算企业技术进步对总产出的贡献，也可以测算企业各生产要素对总产出的贡献。     

技术整合的概念演进与实现过程研究

现有技术整合概念的演进历程,在此基础上提出一个相对系统和完善的技术整合概念。基于该概念,着重分析技术整合的实现过程,提出包括技术甄选、技术转移、技术重构在内的技术整合三阶段过程模型,并阐述该模型的实践指导意义。     

一种新颖的短波电台抗干扰实现方法

本文分析几种常见的抗干扰技术措施,提出了一个实现短波电台的新颖抗干扰方法,该方法把技术和战术相结合,在对较老型号的短波电台升级改造中有一定的实际意义。     

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.