加倍地做好自己的事情

改革开放以来,中国经济的高速发展引起全世界的高度关注,也一路伴随着西方发达国家对逆差、汇率、质量、环保、人权等方面的不断施压.而近来,随着部分别有用心之人利用火炬接力把北京奥运肆无忌惮地政治化,使双方的情绪也达到了对立新高潮.     

论网络时代医药企业的营销决策

传统的营销方式在网络时代已经不再占有优势,网络时代的营销也不仅仅是做个网站来展示自己的商品,而是通过人性化的服务来进一步推销自己的产品.传统意义上的市场营销,是指个人和群体通过创造并同他人交换产品和价值,以满足需求和欲望的一种社会和管理过程.     

三地路演,带来一路震撼——记2007年世冠AMESim车辆行业技术研讨会

在路演上海专场,笔者有幸与IMAGINE市场及销售总监Olivier DATRY、特种热动力应用事业部经理Cedric ROMAN、区域技术经理David MARAND及世冠公司总经理李京燕女士进行了深层次的交流.     

本地化,服务于中国用户——SolidWorks"老兵"写"新传"

作为SolidWorks在中国华南的增值软件经销商,智诚科技(ICT)公司一直以推动整个制造韭技术发展为己任,以先进的设诗理念引导中国的制造业紧跟世界最新潮流为目标.     

A hybrid time-delay prediction method for networked control system

This paper presents an Ethernet based hybrid method for predicting random time-delay in the networked control system.First,db3 wavelet is used to decompose and reconstruct time-delay sequence,and the approximation component and detail components of time-delay sequences are fgured out.Next,one step prediction of time-delay is obtained through echo state network(ESN)model and auto-regressive integrated moving average model(ARIMA)according to the diferent characteristics of approximate component and detail components.Then,the fnal predictive value of time-delay is obtained by summation.Meanwhile,the parameters of echo state network is optimized by genetic algorithm.The simulation results indicate that higher accuracy can be achieved through this prediction method.     

多起典型网络安全事件被成功处理——CNCERT/CC2007年网络安全事件处理部分案例介绍

恶意代码事件处理"Nimaya(熊猫烧香)"病毒事件处理"Nimaya(熊猫烧香)"病毒在2007年初出现流行趋势。该病毒具有感染、传播、网络更新、发起分布式拒绝服务攻击(DDoS)等功能。     

知识资本:中国参与全球创新网络的关键

对于当前世界发达经济实体中的领袖而言,中国到底是威胁还是机遇?在全球商业、工业、政府和学术观察人士中间,这一争论仍在延续.中国在全球工业中的显著作用已经无庸讳言.今天,中国制造了世界上50%的照相机、30%的空调和电视机、25%的洗衣机及接近23%的冰箱.制造业占中国GDP的53%,出口额的90%,进口额的85%以及吸引投资额的70%.中国是世界上(继美国、日本和德国之后)的第四大生产国,并正以惊人的增长速度向前发展.     

整合江湖谁称霸 AMD 780G对决NVIDIA MCP78

AMD 780G 作为超威派7系列整合芯片组掌门人,AMD 780G算得上乱世英雄,因为它是首款正式上市的DirectX 10整合主板,引领着整合江湖进入到另一个新"视"界.这款芯片组全面支持新一代K10处理器,支持Hyper Transport 3.0总线与PCI-E2.0显卡插槽,并且内建了性能等效于Radeon HD2400 PRO的显示核心,从而全面支持UVD高清解码引擎.另外,这款整合芯片组还特别对混合交火技术提供支持,从而让AMD 780G这位独行侠行走江湖一段时间后,便获得了众多派别的鼎立相助,江湖地位日渐攀升.     

单位局域网中ARP攻击的故障处理

1故障现象公安部上海消防研究所11台接入层交换机通过一台交换机和路由器进行级联,接入层交换机类型为ZXR102826(以下简称2826)。设备自开通两年以来一直运行正常,用户上网和下载上传均正常,但是在某个时刻该11台交换机上的40%用户无法上网,表现为打开网页出现"Internet Explorer不能链接到您请求的网页。此页可能暂时不可用。",但其余用户能正常上网,但表现为上网速度大幅度下降。     

中国Linux软件产业生机勃勃2008年Q1中国Linux软件市场销售额同比增长22.6%

根据赛迪顾问发布的<2008年第一季度中国Linux软件市场分析报告>数据显示,2008年一季度,中国Linux软件市场销售额达3800万元,较去年同期增长22.6%,在整个操作系统市场中继续保持快速增长势头.与Unix在整个非嵌入式操作系统中比重下滑相比,Linux则小幅上升0.2个百分点,显示出Linux产业的勃勃生机.这既得益于国家宏观经济的良好走势,同时也与近年来Linux市场产业链生态环境的改善密切相关.     

A method of defuzzification based on the approach of areas' ratio

The new method of defuzzification of output parameters from the base of fuzzy rules for a Mamdani fuzzy controller is given in the paper. The peculiarity of the method is the usage of the universal equation for the area computation of the geometric shapes. During the realization of fuzzy inference linguistic terms, the structure changes from the triangular into a trapezoidal shape. That is why the universal equation is used. The method is limited and can be used only for the triangular and trapezoidal membership functions. Gaussian functions can also be used while modifying the proposed method. Traditional defuzzification models such as Middle of Maxima − MoM, First of Maxima − FoM, Last of Maxima − LoM, First of Suppport − FoS, Last of Support − LoS, Middle of Support − MoS, Center of Sums − CoS, Model of Height − MoH have a number of systematic errors: curse of dimensionality, partition of unity condition and absence of additivity. The above-mentioned methods can be seen as Center of Gravity − CoG, which has the same errors. These errors lead to the fact that accuracy of fuzzy systems decreases, because during the training root mean square error increases. One of the reasons that provokes the errors is that some of the activated fuzzy rules are excluded from the fuzzy inference. It is also possible to increase the accuracy of the fuzzy system through properties of continuity. The proposed method guarantees fulfilling of the property of continuity, as the intersection point of the adjustment linguistic terms equals 0.5 when a parametrized membership function is used. The causes of errors and a way to delete them are reviewed in the paper. The proposed method excludes errors which are inherent to the traditional and non- traditional models of defuzzification. Comparative analysis of the proposed method of defuzzification with traditional and non-traditional models shows its effectiveness.     

Ethical and legal issues for writing researchers in an age of media convergence

With the convergence of digital media into ever-widening social and technological networks for creation and distribution, the contexts for writing and the study of writing and writers have certainly changed. Researchers must navigate a dense matrix of ethical and legal issues in all phases of research when studying the ever-changing processes and products of digital communications. In this article, I draw from numerous sources to articulate a few of the challenges facing digital writing researchers in this age of convergence, focusing on issues of representation (researcher, participant, third-party), issues of informed consent, and issues of copyright and fair use.     

New debates on learning support

Abstract In the present debate on knowledge management and multimedia support of human learning, the word 'mediation' (of conduct) is often used as a natural correlate and rough equivalent to the word 'mediatisation' (of information). It is suggested that the distinction between the two words points to a basic difference between two types of processes which are crucial to a much needed rethinking of the conception and design of humanmachine interaction (HCI).
A redefinition of the 'appropriateness' of media support as the quality of the help to people's self-help rather than of direct control of their behaviour is proposed. Such a redefinition implies a radical shift of paradigm allowing for approaches to human learning as a cognitive activity in its own right. Another view of technological mediation is advocated, in keeping with some recent developments in HCI.     

HUYGENS' PRINCIPLE,PHYSICS AND COMPUTERS

We discuss the emergence of topology from a consideration of set extensions in General Systems Theory. Boundaries arise in a natural way, separating independent elements or regions of the system. Our aim is a unification of Etter theory, Kron's method of Tearing and Jessel's formulation of Huygens' Principle. This should make explicit the equivalence between the objective, structural, holographic and the subjective, relative definitions of information, sought in Bowden (1994b), reprinted in this Special Issue. It connects the abstract generalisations of Schrodinger's equation and Bom's rule derived in probabilistic Etter theory with the real world of electrical and other physical phenomena in General Physical Systems Theory. This paper can be considered as a continuation of Bowden (1990; 1994a) and as a response to Bowden (1994b), reprinted in this issue.

We review the ideas behind Kron's Method of Tearing and Jessel's Principle of Secondary sources (both special cases of the above theory) and their equivalence. We follow Hiley's argument in Hiley (1996) to show how Schrodinger's equation can be thought of as specifying the evolution of (a series of) tearings in continuous space. These can be shown on a commutative diagram as a series of similarity transforms. We compare this with Etter's derivation (Etter, 1998). We describe briefly a recently published derivation of Maxwell's equations from a non-commutative algebra and show how they fit onto a related commutative diagram. Finally we make some comments on applications of the general theory to computer systems. This paper is a series of vignettes of work in progress. It is designed to point the direction of work to come in Constructive Physics.     

An approach to the synthesis of fuzzy stabilization systems with a priori unknown model of an object

A method of synthesis of fuzzy stabilization systems for a broad class of dynamic objects under the assumption that the mathematical model of the object is not known a priori is proposed. The control is formulated in the form of a proportional law of adjustment as a function of a macro-variable; the square of the Euclidean norm of the phase variables is adopted as the macro-variable. An analogous variable characterizes the distance of the object from the equilibrium position. Despite the simplicity of the control law, its sign remains constant due to the fact that the macro-variable is positive-definite over the entire phase space. The switching times of the signals are determined by fuzzy identification of the system’s dynamic modes on the basis of measurement of the derivatives of the macro-variable.     

Forage quality of savannas — Simultaneously mapping foliar protein and polyphenols for trees and grass using hyperspectral imagery

Savanna covers about two-thirds of Africa, with forage quantity and quality being important factors determining the distribution and density of wildlife and domestic stock. Testing hypotheses about the distribution of herbivores is hampered by the absence of reliable methods for measuring the variability of vegetation quality (e.g. biochemical composition) across the landscape. It is demonstrated that hyperspectral remote sensing fills this gap by revealing simultaneously the spatial variation of foliar nitrogen (crude protein) as well as the total amount of polyphenols, in grasses and trees. For the first time, the pattern of resources important for feeding preferences in herbivores (polyphenols and nitrogen) is mapped across an extensive landscape and the modeled foliar concentrations are shown to fit with ecological knowledge of the area. We explain how estimates of nitrogen (crude protein) and polyphenols may be scaled up from point-based observations to reveal their spatial pattern, and how the variation in forage quality can influence the management of savannas, including farms, communal grazing areas, and conservation areas. It provides a glimpse of the choices herbivores must face in selecting food resources of different qualities.     

Innovative uses of ICT in Chilean schools

Abstract This paper presents some of the results of the study of seven cases of innovative pedagogical practices using ICT. The study was performed in the framework of the application of SITES M2 in Chile. The results are divided in two sections. First is a summary of each case, highlighting its innovative characteristics that serve as models of 'good practice' for Chilean teachers. Second, the results of the analysis of what teachers did are outlined; the impact on students and the type of teaching and learning activities in use. Results show that these projects did not provide evidence of having impact on students' learning as defined in the national curriculum. However, they show that students participating in these projects could learn other things, had the opportunity to develop abilities defined as cross-curricular and practised ICT related skills. The analysis of the teaching and learning activities highlights some deficiencies in the way that teachers implement new teaching strategies.     

动态规划求解中国象棋状态总数

中国象棋空间复杂度是分析中国象棋博弈难度的重要指标，中国象棋空间复杂度分析是一个计数问题，即求解中国象棋状态总数。根据中国象棋棋子的着法特征，该问题可分解为若干子问题，利用动态规划分别解决这些子问题，能够求出中国象棋状态总数的精确解。实验得出中国象棋状态总数约为7.54×10^39.88，过去许多文献描述的中国象棋状态总数是不准确的，远远高估了中国象棋状态总数。基于动态规划的计数方法也可以用于计算其他棋类的空间复杂度，也能够用于寻找空间复杂度较低的残局棋型，为构建中国象棋残局库提供依据。     

磁盘缓存管理机制研究

磁盘缓存是解决I/O性能的一种技术。文章主要讲述缓存管理组成、算法的种类及其管理策略。并对基于频率的替换算法的原理、实现方法做了详细阐述。