一种用于Java消息中间件的自适应框架

消息中间件的性能与系统资源的消耗之间存在着一定的矛盾.一般采用人工配置的方法平衡矛盾,不仅难于配置,而且不能很好地适应系统的动态性.本文提出了一种基于模糊控制理论的自适应框架,可以在消息中间件的性能与其稳定性、可靠性之间作较好的平衡.本框架引入AOP的思想,可以与不同类型的消息中间件集成,具有一定的普适性.     

在重庆建设机电产品可靠性与测试技术工程中心的必要性与可行性研究

提高产品的可靠性成为企业在今后相当长的时间内生存和发展的必要条件之一.推动可靠性技术的普及与应用必须有相关的专业队伍和机构,本文从五个方面阐述了建设机电产品可靠性与测试技术工程中心的必要性,结合重庆工业自动化仪表研究所的实际情况,从五个方面论述了建立工程中心的可行性.期望通过本文,能推动重庆市建立这样的机构,协助企业有效提高产品的可靠性水平,从而在市场竞争中占据有利的地位.     

DSP主机接口和PC机并行接口的接口电路的设计

描述了TI的C5000系列的DSP的主机接口(HPI)与PC机的并行接口(ECP模式PS/2子模式)进行连接的硬件设计方案,并提出在各种Windows操作系统下对接口进行操作的驱动软件的解决方法.该方案充分利用了DSP的HPI接口的特点,采用了少量的逻辑电路,实现了PC并行接口和DSP的主机接口的双向连接,使PC机能实时读写DSP任意片内存储单元的内容,控制DSP系统的运行.     

谷歌:让正版音乐自由飞翔

一曲美妙动听的音乐不仅能陶冶人们的情操,还可以缓解人们压抑的心情,使人们的身心得以放松。音乐不但可以敲开封闭的心灵,缓解忧郁苦闷的心情,甚至还可以做到某些程度的心灵治疗。而一首激情高昂的音乐,不但可以提高人们的凝聚力,还能激发人们奋发向上的精神。     

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.     

新产品&工具

Internet Explorer 8 Beta 2随着Firefox 3的推出,微软的IE 8的研发工作也在紧锣密鼓的进行着。之前Beta 1版本在标准的支持和兼容性上有了很大的改进,而8月中旬放出的Bela 2除了在Web标准方面做了更多的改进,在功能方面又有了很大的提高。例如在结构上的调整使得IE更加稳定、对WebSlice的支持、自动恢复、Session Cookie等。此外,在性能方面也有很大的提高。     

维护国家安全 规制网络舆论

近期发生的家乐福、CNN 报道事件,引起了一连串的反应,先是网络上网民的激烈讨论,接着是媒体的报道,之后是蔓延到全国各地的有组织的活动,直至最后政府的表态。这一连串的事件波及国家政治和经济,对社会秩序造成了一定的冲击。在这次事件中,网络舆论再次展示了其强大的力量,通过网络舆论展示了中国人民的巨大凝聚力,有力反击了西方敌对势力的无稽言论。但在看到网络舆论成为维护国家权益的工具的同时,网络舆论中存在的巨大安全隐患也让人担忧。     

热敏电阻器特性线性化的新方法

热敏电阻器的非线性是导致测温准确度下降的主要原因.为解决这一问题,提出了一种实现智能线性化的新方法,它通过少量的样本点的学习,建立与热敏电阻器传输特性相对应的逆函数.通过逆函数,结合查表和插值的算法反演算出测量点的温度.因此,可大幅度地提高测温准确度,一个应用实例验证了本方法的有效性.     

剥开巴菲特主义的内核

巴菲特用信赖建立了一个新的宗教,基本教义就是他从格雷厄姆和费雪身上汲取的价值投资理念。他的想法影响了包括中国在内的全世界的投资者。12年中,巴菲特和中国发生的重要的直接关系,就是他在中国石油上的成功投资。但最终为他带来40亿美元利润的中国石油没能成为他永远不卖出的企业,而这并不妨碍12年间巴菲特在中国赢得无数人的尊重和追随,就如同他在美国和全世界一样。     

NXS奏响常州

在中国的汽车音响发展史上,如果说到坤耀恐怕会没有几个人不知道,因为从汽车音响在中国的起步、发展到今天,有太多的人和太多的事和坤耀有着密切的关系。作为中国汽车音响的擎旗手和中国汽车音响行业的黄埔军校,坤耀的每一步发展及动向势必引起行业的关注,而其代理的每一个品牌也自然值得大家期待。作为坤耀公司2008年刚引进的新产品NXS,内置功能强大的DSP远程控制系统,集数字音效处理和功率放大的功能于一声,功能     

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。