收视价值的迷失 高端人群在远离卫视 2008目睹中国电视之怪现状

近两个月来,本刊网站的论坛里又不太安静。有个叫"高清迷"的香港网友遭到了广东一些网友的质疑。彼此论战的焦点大部分在说香港电视好看或不好看。"高清迷"网友说大陆电视越来越好,水平已经超过香港的电视节目。广东网友们则是缅怀香港电视的辉煌历史。这原本是简单的我说你好你说我好,互相捧场的事情,但是网络的奇妙性在于事情并没有朝积极的方向发展,其结果是吵架不可避免的发生了。外来的和尚是不是会念经,我们先不去管他。重要的是我们要弄清楚自己是怎么回事。本文,是专业电视人对我国各省卫视台做的调查评估。让我们了解一下我国的电视台的现状吧。     

上海慕尼黑电子展暨同期展会见闻

2007年3月21日～23日的上海新国际博览中心是格外的热闹,超过2万名来自电子行业的专业观众汇聚与此.吸引他们来到这里的原因就是慕尼黑上海电子展,慕尼黑上海激光、光电展(LASER. World of Photonics China)、中国国际半导体设备、材料、生产和服务展览暨研讨会(SEMICON China),以及中国国际电子电路展览会(CPCA Show)四大电子业权威品牌展联合在此举行.     

ADSL服务

现在使用ADSL上宽带网的用户是越来越多了,对ADSL设备的维护也成了一个不容忽视的问题.只有维护保养好它,不但让你的"宽带之旅"省心又省力,还能延长其寿命.ADSL的维护可分为软件和硬件两个方面来分析,软件主要是PPPOE协议的问题,和计算机本身的气操作系统,和网卡方面的事情.硬件主要是局端的节点设备,和用户端猫的问题.还有通信的线路等一些因素.     

命题逻辑中代数学的影子

命题逻辑是一个以命题为基本研究对象的数学化的逻辑系统,命题逻辑是数理逻辑的基础,也是计算机科学与技术的理论基础.为了深入理解命题逻辑,将命题逻辑与一般的代数学进行比较,从6个方面简要总结和论述命题逻辑中代数学的一些思想和方法,使得读者能从中体会到代数学的一些思想和方法在命题逻辑中的应用.     

不一样的热插拔(hot swap)控制器

引言 热插拔(hot swapping)的定义是从一块正在通电运作中的背板(backplane)上插入或移除电路板.这项技术被广泛应用在电信服务器(telecom servers)、USB界面、火线(firewire)界面和 CompactPCI应用等[参考1].这种技术可在维持系统背板的电压下,更换发生故障的电路板,而同时系统中其它正常的电路板仍可保持运作.     

从跨国公司CEO扎堆访华说起

11月1日,似乎是个好日子!来自英特尔、EMC、思科的3位跨国公司CEO均选在这一天访华,并宣布其在中国市场大手笔的战略投入. 11月2日,来自全球最大显卡芯片厂商NVIDIA公司的联合创始人、总裁兼CEO黄仁勋借访华之际,在清华大学美术学院报告厅进行了"GPU--还原一个真世界"的演讲.     

FEW-NNN: A Fuzzy Entropy Weighted Natural Nearest Neighbor Method for Flow-Based Network Traffic Attack Detection

Attacks such as APT usually hide communication data in massive legitimate network traffic, and mining structurally complex and latent relationships among flow-based network traffic to detect attacks has become the focus of many initiatives. Effectively analyzing massive network security data with high dimensions for suspicious flow diagnosis is a huge challenge. In addition, the uneven distribution of network traffic does not fully reflect the differences of class sample features, resulting in the low accuracy of attack detection. To solve these problems, a novel approach called the fuzzy entropy weighted natural nearest neighbor(FEW-NNN) method is proposed to enhance the accuracy and efficiency of flowbased network traffic attack detection. First, the FEW-NNN method uses the Fisher score and deep graph feature learning algorithm to remove unimportant features and reduce the data dimension. Then, according to the proposed natural nearest neighbor searching algorithm(NNN_Searching), the density of data points, each class center and the smallest enclosing sphere radius are determined correspondingly. Finally, a fuzzy entropy weighted KNN classification method based on affinity is proposed, which mainly includes the following three steps: 1、 the feature weights of samples are calculated based on fuzzy entropy values, 2、 the fuzzy memberships of samples are determined based on affinity among samples, and 3、 K-neighbors are selected according to the class-conditional weighted Euclidean distance, the fuzzy membership value of the testing sample is calculated based on the membership of k-neighbors, and then all testing samples are classified according to the fuzzy membership value of the samples belonging to each class;that is, the attack type is determined. The method has been applied to the problem of attack detection and validated based on the famous KDD99 and CICIDS-2017 datasets. From the experimental results shown in this paper, it is observed that the FEW-NNN method improves the accuracy and efficiency of flow-based network traffic attack detection.     

追日

去年10月一个温暖的早晨,在澳大利亚内陆深处,14名麻省理工学院的学生和校友上午6点就爬出了他们的睡袋,准备车队,进行又一天的艰苦驾驶,在护卫队的护送下,他们驶过一段平坦、笔直、炎热、灰尘弥漫的道路.领头的车辆迎着其他车流,形成了一个缓冲带,一辆货车断后以监测整个队伍的进程.     

Design of Diode Type Un-Cooled Infrared Focal Plane Array Readout Circuit

The diode infrared focal plane array uses the silicon diodes as a sensitive device for infrared signal measurement. By the infrared radiation, the infrared focal plane can produces small voltage signals. For the traditional readout circuit structures are designed to process current signals, they cannot be applied to it. In this paper,a new readout circuit for the diode un-cooled infrared focal plane array is developed. The principle of detector array signal readout and small signal amplification is given in detail. The readout circuit is designed and simulated by using the Central Semiconductor Manufacturing Corporation (CSMC) 0.5 μm complementary metal-oxide-semiconductor transistor (CMOS) technology library. Cadence Spectre simulation results show that the scheme can be applied to the CMOS readout integrated circuit (ROIC) with a larger array, such as 320×240 size array.     

抓住流动性机遇推动多层次资本市场建设

到2007年第一、二季度,积累已久的"流动性过剩"问题在中国经济生活中凸现,特别是对中国国内股市产生了巨大影响.由于对中国汇率的失重预期以及外贸顺差等双重因素,导致了"流动性过剩".其初始的"泄洪"渠道从投资房地产业转向主板A股市场.在这场被热炒的"流动性过剩"盛宴中,代表创新与可持续性发展的高新技术产业巨头企业们开始纷纷回归A股上市.     

Application of model of mixture of probabilistic distributions for definition of the signals of radiophysical probing

The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde.     

浅析IP网服务质量(QoS)

解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力.     

部分偏振光的表示方法

随着光纤通信和光纤传感的快速发展,人们时光的偏振态提出了越来越高的要求.光是一种横波,其偏振态大致分为:完全偏振光、部分偏振光和自然光.文中介绍了完全偏振光的几种表示方法,给出了几种部分偏振光的描述方法.并阐述了它们之间的差异与联系.     

NTRUsign式计算量分析

介绍了NTRUsign签名算法的密钥生成过程,其在实现的过程中需要进行上百位的大数运算问题,这些数字远远超出了普通电脑存贮范围。而要进行大数运算,就得用数组存贮,进行模拟运算,这就大大增加了运算量。文中分析了这个算法实现过程中的运算量,分析结果说明NTRUsign的运算量过大,以致实际并非一个实用算法。     

Interpretation of responses of visual cells of limulus

Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature.     

影响镀镍层内应力的因素及排除方法

对影响镍镀层内应力的因素做了介绍和分析,提出了对收缩应力的一种解释,提供了排除这些因素影响的方法,指出重视镀液的管理是减少各种影响内应力因素的主要办法。     

电子行业标准制修订项目计划管理信息化的实现

论述了推进电子行业标准制修订项目计划管理信息化的必要性.并提出了具体措施;详细介绍了电子行业标准制修订项目计划管理数据库的设计思路和实现方法.阐述了对后续工作的几点思考.     

Definition of function of squares amount of angular part of film element

By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental researches of large-scale models are represented.     

Temperature dependence of index of refraction of polymericwaveguides

The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N_TE-N_TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced     

水的光学特性对水下光学成像质量影响的分析

水的光学特性对光学成像质量有着重要的影响,水对光的吸收、散射作用可造成光在水介质传播中的衰减,本文就水的光学特性及其对水下光学成像质量的影响进行了分析,以为成像系统在水下的应用提供基础的理论依据。