基于REST风格的Web服务在物联网服务平台的应用

物联网在嵌入式系统、网络信息等先进技术的推动下逐渐应用于智能家居等各个领域并产生深远影响,但是现存物联网体系存在层次间耦合性高、重用性低、海量数据处理难等问题,导致新型应用创建困难。针对以上弊端,本文提出一个基于REST架构风格的物联网服务平台,设计了一套高效、灵活的REST风格Web服务API,实现了物联网数据资源的开放和共享,为物联网应用的创建提供功能支持。     

基于粒子群优化训练的模糊控制数学建模方法

为了有效提高模糊控制系统的精度和计算效率,结合混合粒子群优化算法,进行模糊控制系统的数学建模。传统的模糊控制数学建模采用纳什均衡求解方法,难以收敛到状态空间的最优解,导致控制性能不好。提出一种基于粒子群优化训练的模糊控制数学建模方法,构建了模糊控制的总体结构模型,进行标准的粒子算法描述,在随机泛函的学习样本约束下,求得模糊控制参量的控制域任意Borel子集的全局最优解。采用位置矢量适应度更新方法进行粒子群优化训练,实现对模糊控制数学模型改进。仿真结果表明,该数学模型的收敛性较好,降低计算开销,提高了模糊控制精度。     

基于多模型集的预测控制研究及物理平台应用

针对工业生产中,可以采用一阶惯性加纯滞后模型描述不同工况下动态特性且随工况变化的工业过程,[1]传统的比例-积分-微分控制器(PID)很难满足工业中非线性对象要求的控制品质,多模型集控制策略是一种解决此类难点的有效方法,其特点是用多个线性模型来逼近非线性过程,此类方法已在许多非线性控制过程中获得应用。预测控制算法具有鲁棒性强、抗干扰性强、对模型的精度要求低等优点。本文将基于多模型集的预测控制算法搭载在可编程逻辑控制器(PLC)中,将此设备应用于物理实验平台。根据物理平台的运行情况,此算法能够有效地克服系统非线性、大迟延特性,取得了令人满意的控制效果。     

蚁群算法优化和路径规划问题的应用研究

基于智能仿生计算的蚁群优化算法在路径规划问题中具有较好的应用前景,通过蚁群算法优化,实现机器人路径规划和应急救援的路径规划等。传统的基于蚁群算法的路径规划在信息素转换中容易导致信息丢失,产生局部收敛,提出一种基于信息素多目标Pareto支配的蚁群优化算法实现路径规划,利用信息素多目标Pareto集合序列的均匀遍历特性和逻辑差分变尺度特征,进行变尺度搜索,根据蚁群优化算法一次次地更新搜索空间,结合负反馈机制,通过蚂蚁的信息素转化进行路径分析,采用Pareto支配集记录下最优的食物源,蚁群在寻找食物过程中,避免了局部寻优和局部收敛,仿真结果表明,采用该算法进行蚁群优化后的路径规划避障效果较好,以较快的收敛速度和较少的迭代次数找到最优路径,收敛性好。     

工业电气自动化控制的应用及展望初探

电气自动化控制是工业生产的重要内容,对工业生产有着重要的作用。文章介绍了工业电气自动化控制的应用现状、作用、原则,并对将来的发展做出了展望。今后在实际工作中,为了促进工业电气自动化控制的发展,需要根据实际情况采取相应的策略,开发统一应用系统平台、搭建网络体系架构,并统一系统结构程序标准。     

基于AHP的模糊综合评价方法在货运综合运输优化中应用

针对东江流域货运综合交通运输结构的特点,以AHP的多级模糊综合评价理论为基础,从社会效益、经济效益和生态效益三个方面,选取了安全性、成本利润率、噪声污染程度等作为定性指标集和定量指标集。应用模糊统计和模糊分布法确定各指标集的隶属度,结合层次分析法计算出评价指标权重,建立多级多目标模糊综合评价模型。结果表明：东江流域现有的货运综合交通运输结构有待优化,应该适当提高水路运输和铁路运输比例,从而实现社会、经济和生态效益的最大化。     

物联网平台下基于云计算的智能家居系统设计

物联网平台下采用云计算进行智能家居系统设计,提高家居控制的可靠性和智能性。传统的智能家居系统设计采用并行计算的Zig Bee技术,由于采用单线程驱动方式导致智能家居控制的指令容易出现中断。在物联网平台下,提出一种基于云计算和Android客户端的智能家居系统设计方法。首先进行了智能家居系统的总体设计,然后基于云计算方法进行智能家居控制的控制指令融合处理,在物联网平台下进行智能家居系统的模块化硬件设计,构建2个并行输入/输出外围接口单元PPI,设计DMA控制器和2个"看门狗"定时器,从而在物联网平台下实现智能家居控制的无缝连接和远程控制。实验测试结果表明,该智能家居系统的控制收敛性,系统稳定性和面向对象性较好。     

基于REST架构的人事管理系统设计与实现

为了规范人事管理流程,提高人事录用效率,在单位内实现各部门人力资源共享,同时为了适应多平台工作环境,方便管理人员通过电脑、手机、平板等多种终端进行人事管理工作,提出了基于REST架构的人事管理系统。介绍了系统的总体架构、功能模块及数据库设计,并以招聘管理为例详细说明了招聘模块的具体实现。通过人事管理系统实现了日常人事管理电子化、流程化、规范化、便捷化,具有较高的实用价值。     

大型桥梁造价预测交叉均衡算法仿真

大型桥梁建设工程巨大,影响因子较多,工程造价预测难以有效均衡,传统方法采用单因素灰色关联预测的工程造价预测设计,预测精度和均衡性不好。提出一种基于主成分分析的大型桥梁造价预测交叉均衡算法,对大型桥梁工程造价预测和控制进行数学模型构建,得到质量—效率—成本控制的多目标贴近度数学模型。分析大型桥梁消耗影响特征信息统计参量,得到主成分分析的成本特征方程,实现大型桥梁造价预测交叉均衡算法。实验结果表明,采用该算法,可以实现质量水平和效率水平较高,单位成本较低的目标,达到对工程造价预测交叉均衡的目的。     

基于建模仿真的可移动机器人平台控制方法

<正>工业机器人,是指面向工业生产领域的多滑膜关节机械手或多自由度的机械设备,它可自主进行工作,并靠自我驱动与控制来完成不同功用的一类设备。对于实现这些工业机器人的高度自主运动与操控,研发可移动工业机器人平台控制方式就显得尤为重要。为了针对目前关键技术的缺陷,并更直观地展现出工业机器人平台模型,我们将试图利用三维模拟仿真研制可移动工业机器人平台控制方式。本文旨在通过三维建模仿真研究可移动工业机器人平台控制方法,探讨一种更精确、高效的控制模式,为实际应用提供理论支持和指导。     

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.     

Our Own Devices: Heterotopic Communication, Discourse, and Culture in the Information Society 1

The main premise of this article is that in information societies generally, and in virtual social contexts particularly, a distinctive style of interaction to facilitate the communication of difference, heterotopic communication , has emerged. It rests on two cultural foundations: an ideological belief in the positive, socially integrating power of communication, and a prevailing ethic of instrumental rationality, subjective individualism, and strategically practiced self-interest. The former is demonstrated by the use of simulation and spectacle as sources of information; exhibitionism/voyeurism as a communicative style; and the awareness of surveillance. The latter is seen in the competitive use of knowledge as a commodity; a surface globalism masking deep parochialism; lateral as well as vertical information inequity; and the use of public versus private as strategies for engagement rather than as spaces. Those who engage in heterotopic communication resort to their 'own devices' both in the sense of personal agendas, strategies, interests, and interpretations, and in the form of the telecommunication tools that help realize them. These personal and technological devices allow individuals with the right educational and technical resources to avoid exposure to disagreement, difference, or other information that does not serve their direct purposes or reflect their particular views of the world; yet they also help convey the appearance of openness, availability, and cooperation. This style of interaction is used strategically in combination with information and communication technologies to gain social or economic advantages, but it may encourage social separatism and parochialism, inhibit the negotiation of disputes, and emphasize competing interests.     

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