夏普TU—HD200高清插卡机（上）

问NHK当初设计高清电视的初衷是什么？回答大大出乎意料。70年代日本楼价飞涨。家居细小。逼迫大家在2米左右观看彩电。闪烁的扫描线令人头晕。NHK经过试验。发现增加一倍的扫描频率。并用有效像素填补其上的空白。就能让入容忍了。 今天。虽然我们知道高清的带宽是标清的5倍。画面细腻逼真、晶莹剔透。高分辨平板也已梦想成真。但BSD的观看距离。始终没有跳出原来的框框。即使是47英寸的Full HD液晶。也只能在2米以内观看。 中国人比日本人气派。客厅宽度往往超过6米。平板电视挂墙安装。使观看距离更恶劣。我将沙发向前挪了又挪。后方半个客厅空置了。为了拉长观看距离。有人提议用大屏幕投影。但除非是专业的三枪。否则一定扫兴而归。好消息是松下即将量产100英寸级别的PDP。才能满是BSD玩家的终极要求。[编者按]     

9款主流家庭影院投影机大测试

近两年来。以投影机为主体的视频市场发展很快。被广泛应用在教育、业务以及商业服务领域。其中。面向家庭影院的投影机产品更是层出不穷．各投影机厂商纷纷开始重视家用市场。投影机的产品线也开始进行市场细分。以往仅仅是以价格来划分市场为主。价格低的就划归家用市场。价格高的就划归业务市场。由于投影机的技术不断成熟。目前已经流行用画质取向和节目源的适应性来划分使用领域。家庭影院用的投影机强调呈现视频节目的高质量。因此在指标上追求高对比度和丰富的色彩还原。反而在亮度方面有所牺牲。以别于一味追求超高亮度的业务用投影机。另外。家庭影院用投影机为提升画质。往往采用16：9的液晶片或者内置丰富的屏幕比例设定。引入高质量的逐行扫描处理芯片。灯泡也选用宽频谱的类型。     

下一代网络技术综述

本文从下一代网络的构成。下一代网络中的媒体网关。下一代网络中的软交换。下一代网络能提供的新业务。下一代网络的特点。下一代网络的融合特征。现有电信网络如何演进到下一代网络。有线电视网络的改造也应向下一代网络靠近等方面。详细地介绍了下一代网络。     

1988年电子产品预测

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踏雪迎春点评王煜全《电信的春天》

半个多月前。北京遭遇了有气象记录以来最长的一场连续降雪。也是在这几天．和许多媒体一样．《通信世界》收到了Frost＆Sullivan(中国)公司王煜全的《电信的春天》一。在电信业经历连续两年的寒冬之后。踏着皑皑白雪。品阅该。享受着其经典评述和点睛之笔．遥想着可能要来的“春天”，的确别有一番滋味。其实。时下王先生的这篇章已在业内广为流传。这是一篇经典之作。说它经典。其原因是。该不仅详细阐述了历时两年的“电信的冬天”是如何来临的．也形象生动地描述了处于“冬天”的各电信企业的千姿百态。并为整个行业如何迎来春天指明了方向。王指出。电信服务提供商和制造商是整个电信生态系统中荣辱与共的双子座。谁也离不开谁。冬天里感觉更寒冷的是电信制造商．这是因为电信运营商削减投资．停止对制造商供血造成的。在传统的思维和经营模式下。作为基础电信服务提供商的运营商对互联网带来的网络需求预期过于乐观。而在互联网泡沫破灭之后，运营商一方面不得不对过去的投资加以消化．另一方面对未来的发展迷茫而谨慎。所以。要想让运营商为制造商继续供血。就必须为运营商未来的发展指明方向．这个方向需要包括制造商在内的所有业来共同指明。王指出的方向是。在基础电信市场尤其是长途电话收入急剧萎缩之后。电信运营商必须从基础电信服务商向基于娱乐经济的信息服务提供商转型。在转型的过程中。运营商必须在总结自己面临的生存环境和掌握资源的基础上从自身的整体战略来考虑。然后选择自己的业务发展模式。采取独到的管理技术和管理方式。最终在产业各方尤其是制造商的帮助下。实现这一战略转型。对电信制造商而言．电信运营商的这一转型充满无限商机．制造商们要想迎来自己的春天．就需要与运营商合作。在帮助运营商转型的过程中。找到属于自己的商机。收到《电信的春天》一时．本刊原计划全刊登。但看到发来E—mail的“地址信息”后。只好作罢。也许其他刊期更短的兄弟媒体会提前刊登。但半个多月过去。除了几家网站登出该外．我们还没有看到相对完整的铅字版本。于是。我们就把该的精髓之处录出来．并对其加以点评，以飨读．希望对行业的发展及早日迎来春天有所助益。     

看向2006

网络融合在2006年将奏响业界的主旋律。为什么要搞下一代网络，就是因为电信转型。体制改革已经到了攻坚阶段。（未来的）这些转变可以概括为“融合和分化”。2006年移动通信面临的最大不确定性，就是3G牌照发放。在看通信产业的未来发展时，应该以大融合为背景。3G如果明年商用，将为移动终端产业注入新的活力。但即便如此。明年也很难形成市场规模。如果运营商不能建立一个有效的商业市场模式的话，他的能力都是无从谈起的。‘任何一个行业，只有跟得上社会发展的趋势。才能真正做到可持续的发展。社会各行业中的企业用户是社会经济发展的主体。满足他们所需要的，我们就能够得到更多。即使3G真正到来。也并不能给通信业带来根本性的变化。IPTV有关的融合业务仍处在成长初期。一方面国际运营商将涉足国内电信业，另一方面超过10000家的互联网企业将涉足传统电信业务，尤其固网话音领域。到了“建设一个人人受益的互联网”的时代。中国3G市场的发展。总体上将显示出平稳、理性的特征。进入2006年，我国的电信业将不断加快自己的转型步伐。中国通信业将全面进入新通信时代。[编按]     

直道痴情了无益,未妨惆怅是清狂

i)熬{{纸票前。-下载,编辑,更新。再下载,再编辑,再更新。好苦。好闷。也好欢喜,好兴奋。一点点的看着”游戏人生”的成长。一封封的回复朋友的MAILo我知道自己是为了什么。不是钱。真的不是。朋友们的关心是最好的回报。过节了,一封卡片,一句问候。好暖和的,心里。开心,只因为大家知道我们的存在。名气是问题。我把游戏人生挂在了热讯。可我从来都当那是自己的孩子。我没办法放弃。无论它在哪里。瓢瓤靡瓢;::::罗翼鄂但是我们真的是这么想的,相信b~也是的。我们证明了我们存在的价值。离不开键盘清脆的敲打声;离不开风扇沉闷的旋转声;离…     

电信企业融资行为分析及策略研究

资本是企业的”血液”，是企业发展的第一推动力和持续推动力。随着我国电信业改革的不断深入，市场竞争日趋激烈。资本的重要性日益凸显出来。资金问题逐渐成为制约各电信运营商进一步发展的关键因素，融资成为中国电信企业不可回避的话题。企业融资的关键在于确定合理的资本结构。以控制融资风险。最小化融资成本。从而谋求企业收益的最大化。所谓资本结构是指企业长期资金各项来源的组合及其相互关系。因此。采取多种融资途径并对它们进行合理组合是电信企业融资决策的重要内容。也是电信企业进行科学融资的前提和基础。     

苹果朝觐之旅——品味Macworld 2005

在宗教习俗中，朝觐现象可以说是最为普遍和通行的一种崇拜形式。伊斯兰教的圣城麦加每年要接待上百万世界各地的朝觐者。藏传佛教的信徒要从居住地以一步一长叩的形式完成远则数千公里的朝觐之旅。在这个物欲横流的商品社会。个人的精神信仰正受着前所未有的冲击。尽管如此。但仍有不少的企业在商业经营过程中创出独特的精神文化现象。发人深省。在IT圈内。苹果(Apple)电脑公司可谓脱离技术堆砌形象的一个典型。以自己的创新精神书写了“苹果传奇”。     

动态网络环境下切换成功率优化方法

GSM网络经过十多年的发展。网络规模和结构也越发庞大和复杂。LAC区的划分也越来越细。许多省会城市的BSC都超过了20多个。在网络不断的调整与变化过程中。切换成功率的优化已成为GSM网络优化的一项重要内容。 切换是移动通信的一个最基本的要求。当网络出现动态的调整与变化时。切换参数与邻区关系等也都随之产生相应的调整。复杂的网络结构使得切换也不再仅仅是一个小区切换到另一个小区那么简单。跨设备．跨网络的切换越来越多。如微蜂窝与宏蜂窝的切换。双频网的切换。BSC间的切换等一这些都会对网络产生较大的影响。由此。各种各样的切换问题也随之产生。如全网切换成功率降低一切换掉话率增加等。[编者按]     

Fault Trees, Prime Implicants, and Noncoherence

The K&H algorithm for finding the p.i.'s of a noncoherent fault tree is too long and complicated for the purpose. The example that was used by K&H to illustrate the algorithm is reworked with known methods to show that alternatives are available that require less work. This correspondence is a series of four letters published as a sequel to a paper by Kumamoto & Henley (K&H) that presented an ``algorithm based on top-down analysis particularly designed for noncoherent fault trees'. The first of these letters is by Locks, claiming that the article is too complicated and that a shorter procedure is available. This is followed by Reply #1 by Ogunbiyi and Reply #2 by K&H. The note is concluded with a rebuttal by Locks to both replies.     

核壳双层颗粒的外层介质对散射光的影响

简要介绍核壳双层颗粒的散射理论 ,利用数值计算探讨波长不同时核壳双层颗粒与单层颗粒散射光的不同 ,详细分析核壳双层颗粒外层介质的厚度、折射率对整个核壳双层颗粒散射光的影响     

Wafer distribution system for a clean room using a novel magneticsuspension technique

A linear transport system, which is capable of reducing the weight of a moving carrier by separating power-supplying devices, is developed by using a new magnetic levitation technique. This system is designed to distribute a wafer between semiconductor fabrication process modules in clean rooms, because it can eliminate particles and oil contamination that normally exist in conventional transporter systems due to rubbing of mechanical components. The transport system consists of a wafer carrier, two levitation tracks, two stabilization tracks, and a propelling system. Levitation is achieved by using opposing forces produced between electromagnet tracks and permanent magnets. Stabilization is achieved by using a simple feedback control. The continuous propelling force is obtained by sending specific current patterns to the propulsion coils. The dynamic model of the transport system is presented, and it is verified by experiment. The system performance is experimentally investigated     

形变超晶格的位错模型与粒子的退道效应

引入位错模型讨论粒子的退道效应.把超晶格的沟道偏折等效为位错引起的沟道弯曲,并对刃型位错的退道行为作了具体分析.利用正弦平方势,把粒子运动方程化为具有外力矩的摆方程,用能量法分析了系统的相平面特征,导出了系统的退道系数.     

用阱作高阻漂移区的LDMOS导通电阻的解析模型

分析了一个用阱作为耐高压漂移区的LDMOS的导通电阻，提出了带有场极板的高阻漂移区导通电阻的计算公式，改进了双扩散沟道导通电阻的计算公式. 针对一个LDMOS的例子做了计算，并将其与相同参数情况下用MEDICI软件模拟的结果作了对比. 结果表明两者相差仅5%，这说明所得公式可用于该类型LDMOS的分析和设计.     

A hybrid modeling method for mechanical systems

In this paper, a system identification method for hybrid systems switched by the magnitude of velocity and displacement is proposed. First, it is shown that the regression vector space of a mechanical system switched by the magnitude of velocity cannot be separated by a hyperplane. Then a method based on support vector machines with a polynomial kernel is proposed. The effectiveness of the proposed method is shown by simulations and experiments.     

Tubular monopole of arbitrary dimensions: The radiation field

The complete radiation field of a tubular monopole of arbitrary length and radius, which is base driven by a low-impedance coaxial transmission line, is derived. The integral equation for the current distribution, which includes a term for the feed-point correction is solved by the inversion of a matrix under the assumption that the current is a continuous, piecewise linear function. The far-zone electromagnetic field established by this current is expressed in closed form. It is found that the effect of thickness is to round off the nulls predicted by previous theory for vanishingly small radius and to enhance the high-angle radiation.     

Determination of the current distribution on a bidimensional infinite periodic structure of thin metallic wires using the method of the singular integral equation

The singular integral equation of the diffraction by thin metallic wires is used to determine the current distribution on a infinite periodic structure in two dimensions. The periodic cell is constituted by thin wires joined or not joined between the cells. The current distribution on parallel and planar meander lines induced by a plane wave of any incidence and polarization is studied. The current is obtained by a matrix inversion deduced from a convenient segmentation of the cell.     

Tolerance analysis of aligning an astigmatic laser diode with asingle-mode optical fiber

A general method of analyzing misalignment tolerance of coupling light from an astigmatic laser diode to a single-mode fiber is described. We apply the method to derive the 3 dB tolerances caused by longitudinal, lateral, and angular misalignments in the optimal conditions for two kinds of coupling schemes. One is by the use of a rotationally symmetric optical system, and the other by a rod which is a special case of utilizing a rotationally asymmetric optical system. In the latter coupling case, the misalignment caused by a laser is found to have a much less 3 dB tolerance in the vertical direction than that caused by a fiber     

Design considerations and stability of a digital filter with finite wordlength

A method to improve the stability of the forced response of a recursive digital filter with nonlinearities due to finite wordlength is presented. An analysis of applying a stability criterion on the nonlinear filter is performed by transforming the problem into a mathematical problem of finding a zero set. As a result of the mathematical analysis, one can find a maximal sector size that bounds an equivalent nonlinearity, so that stability is ensured. This sector size is influenced by the choice of the desired nonlinearity characteristic appropriate to the problem, and the amount of the input scaling needed. Another improvement of the filter's stability is obtained by adding a feedback gain, the value of which is determined by using the zero set-finding method. Simulation results showing the improved stability properties of a filter designed by this method are presented.This research was supported by the Fund for the Promotion of Research at the Technion.