浅析电信运营商在3G中的经营策略

随着电信业的发展,以3G为依托的一个巨大产业链已经开始形成,并将推动、促进新的电信市场格局的构建.面对这种形势,电信运营商应当采取有效的竞争策略,主动应对、打好品牌战略、挖掘用户潜在需求、建立有效的监管机制,从而为企业营造一个可持续发展的生态环境.     

基于光纤光栅传感阵列及双目视觉的内窥镜三维显形系统的研究

内窥镜柔性杆在体内的形状显示是一种新型的技术,在这种技术的帮助下,当病人的结肠处于一种不正确的位置上或者说在进境的过程中内窥镜柔性杆的形状形成了扭曲,而形状扭曲会导致内窥镜检查的不安全性,如果预先知道这种状况的发生,就能给诊断带来安全性。本文主要研究了一种基于光纤光栅传感阵列的内窥镜柔性杆的形状及双目视觉的内窥镜镜手柄部分的姿态检测方法,这两种方法的集成构成了整个内窥镜的显形系统。详细的分析包括基于光纤光栅传感器信息的检测原理以及空间曲线重建算法,内窥镜手柄部分相对于世界坐标系的位姿估计。实验结果证明了提出方法的有效性。比较以前的研究,形状重建的精度已经提高到了4.5mm。通过加入内窥镜手柄的位姿检测,整个三维形状显示子系统变得更加有效和更实用化。     

论基因资源保护与《与贸易有关的知识产权协议》第27条的修改

随着生物技术的发展,对生物技术所必须的原材料-基因的保护迫在眉睫。文章提出了由于国际社会对基因资源缺乏强有力的保护而出现的“生物海盗”问题,阐述了世界贸易组织(WTO)历届部长会议对基因资源的讨论,然后论述了在世贸组织新一轮多边贸易谈判中如何修改《与贸易有关的知识产权协议》(TRIPs)第27条,将基因资源保护纳入到 TRIPs框架之内。文章还阐明了中国作为基因资源极其丰富的发展中国家对基因资源的保护应有的姿态。     

On 3-Stage Clos Networks with Different Nonblocking Requirements on Two Types of Calls

Hwang and Lin introduced a new nonblocking requirement for 2-cast traffic which imposes different requirements on different types of coexisting calls. The requirement is strictly nonblocking for point-to-point calls among the 2-cast traffic, and is rearrangeable for genuine 2-cast calls. They conjectured that the 3-stage Clos network C(n,n,r,r,2n) satisfies the above requirement. We prove that C(n,n,4,r,2n) satisfies the above requirement.Supported in part by NSC91-2115-M009-002.Supported in part by the National Science Council under grant NSC91-2115-M009-010 and by the Li-Li-Tai-Yang Network Research Center of National Chiao Tung University.     

3D电影的冷思考——基于叙事的视角

一部优秀的3D电影是技术与艺术的完美结合,3D电影在给观众带来视觉震撼的同时也对传统的电影美学带来了冲击。3D技术华丽的包装是否能掩盖电影原本老套的叙事结构和单一的故事情节?纵观电影史,技术上的重大突破都对作为艺术的电影产生巨大的影响;但却不应忘记一部好的电影终究离不开好的叙事,3D电影也不例外。另外,由于受市场需求影响,目前3D电影的叙事模式多为好莱坞商业片惯用的叙事模式,电影叙事的作用有被弱化或被缩小的倾向,因此,需要对3D电影的叙事问题进行思考。     

三维激光扫描仪在城市外立面采集成图中的应用

当前我国正进入城市化快速增长时期。如何进行旧城的更新改造和现代化建设,是当今城市化面临的重大课题,传统测绘手段在满足旧城改造设计方面体现诸多不足。本文以Trimble GX地面三维激光扫描仪为测量设备,开展城市外立面采集方面的应用,后期采用天正软件进行城市外立面图的绘制与编辑,分析并总结了采集与后处理过程中问题与误区。     

比较优势、竞争优势与区域一体化

根据新结构经济学理论,遵循比较优势是经济发展成功的“药方”。根据国家竞争优势的“钻石体系”,一个国家发展的产业需要“充分利用当地丰富的资源”“国内有大市场”“国内形成产业集群”“国内是竞争市场”等四个条件才能具有竞争优势。但是,竞争优势的第一个条件其实就是由当地的要素禀赋所决定的比较优势,第三、第四个条件以所发展的产业符合比较优势为前提,而符合比较优势的产业不仅可以有国内市场也可以有国际市场,所以,比钻石理论的第二个条件所强调的市场规模还大。因此,竞争优势的建立离不开比较优势的发挥,按照比较优势发展是竞争优势的基础,只有充分依靠和发挥自己的比较优势才能建立自己的竞争优势。只有充分发挥各个地区的比较优势,通过区域一体化,形成更大的产业集群,这样才能将自身的比较优势更好地转变为在国内国际市场的竞争优势。     

幼儿园开展0-3岁早期教育服务指导的现状调查与分析——以陕西省为例

采用问卷法,面向全省范围内的幼儿园及0-3岁婴幼儿家长进行问卷调研,了解已开展过0-3岁早期教育服务指导的幼儿园基本现状,以及幼儿园对于开展0-3岁早期教育服务指导的总体意愿;了解家长在0-3岁早期教育方面的需求及现状。调查分析发现,幼儿园超半数有开展0-3岁早期教育服务指导工作的意愿;幼儿园受家长认可、最突出的优势是“办园规范,值得信赖”;服务指导最主要形式为亲子活动和托班;政策、师资、资金是所需的主要支持。据此建议应及早出台相关具体政策规范幼儿园开展0-3岁早期教育指导服务,幼儿园也应从师资、形式、内容、场地、时间等方面提升专业性、兼顾灵活性以满足家长需求,幼儿园开展0-3岁早期教育指导服务应在先总结典型经验的基础上逐步推广。     

Great Expectatrics: Great Papers,Great Journals,Great Econometrics

The article discusses alternative Research Assessment Measures (RAM), with an emphasis on the Thomson Reuters ISI Web of Science database (hereafter ISI). Some analysis and comparisons are also made with data from the SciVerse Scopus database. The various RAM that are calculated annually or updated daily are defined and analyzed, including the classic 2-year impact factor (2YIF), 2YIF without journal self-citations (2YIF*), 5-year impact factor (5YIF), Immediacy (or zero-year impact factor (0YIF)), Impact Factor Inflation (IFI), Self-citation Threshold Approval Rating (STAR), Eigenfactor score, Article Influence, C3PO (Citation Performance Per Paper Online), h-index, Zinfluence, and PI-BETA (Papers Ignored – By Even The Authors). The RAM are analyzed for 10 leading econometrics journals and 4 leading statistics journals. The application to econometrics can be used as a template for other areas in economics, for other scientific disciplines, and as a benchmark for newer journals in a range of disciplines. In addition to evaluating high quality research in leading econometrics journals, the paper also compares econometrics and statistics, alternative RAM, highlights the similarities and differences of the alternative RAM, finds that several RAM capture similar performance characteristics for the leading econometrics and statistics journals, while the new PI-BETA criterion is not highly correlated with any of the other RAM, and hence conveys additional information regarding RAM, highlights major research areas in leading journals in econometrics, and discusses some likely future uses of RAM, and shows that the harmonic mean of 13 RAM provides more robust journal rankings than relying solely on 2YIF.     

The asymptotic equivalence between the iterated improved 2sls estimator and the 3sls estimator

In this paper we show that the 3SLS estimator of a system of equations is asymptotically equivalent to an iterative 2SLS estimator applied to each equation, augmented with the residuals from the other equations. This result is a natural extension of Telser (1964).