暗夜舞者

一个偶然的机会,把我带进了这些微小鳞翅目昆虫的世界     

A ciosed-loop algorithm to detect human face using color and reinforcement learning

A closed-loop algorithm to detect human face using color information and reinforcement learning is presented in this paper. By using a skin-color selector, the regions with color “like“ that of human skin are selected as candidates for human face. In the next stage, the candidates are matched with a face model and given an evaluation of the match degree by the matching module. And if the evaluation of the match result is too low, a reinforcement learning stage will start to search the best parameters of the skin-color selector. It has been tested using many photos of various ethnic groups under various lighting conditions, such as different light source, high light and shadow. And the experiment result proved that this algorithm is robust to the vary-ing lighting conditions and personal conditions.     

颜色词在英汉两种语言中的使用差异

语言作为一种交流的媒介,是人们表达思想、交换信息的主要手段.但是文化差异无处不在,渗透到社会的每一个层面.颜色词语在英语和汉语中存在不同的文化内涵和使用差异,这反映了英汉民族不同的文化特点,历史背景、风俗习惯以及思维方式和价值取向.     

花的颜色操作：花的整容术

花不仅是植物的冠冕,而且是生殖器官。有色花瓣和雄蕊对传粉者有非同寻常的吸引力,因而对复制成功极端重要。产生花的颜色的指令被编在DNA上。目前,有可能为植物提供若干新基因或剪切现有基因,遗传学家正在以新的热忱看待花的颜色操作术。     

Principal component analysis using neural network

The authors present their analysis of the differential equation dX ( t )/dt = AX ( t ) - X^T( t ) BX( t)X( t), where A is an unsymmetrical real matrix, B is a positive definite symmetric real matrix,X E Rn ; showing that the equation characterizes a class of continuous type full-feedback artificial neural network; We give the analytic expression of the solution; discuss its asymptotic behavior; and finally present the result showing that, in almost all cases, one and only one of following eases is true. 1. For any initial value X0∈R^n, the solution approximates asymptotically to zero vector. In thin cane, the real part of each eigenvalue of A is non-positive. 2. For any initial value X0 outside a proper subspace of R^n,the solution approximates asymptoticaUy to a nontrivial constant vector Y( X0 ). In this cane, the eigenvalue of A with maximal real part is the positive number λ=Ⅱ Y (X0)ⅡB^2 and Y (X0) is the corre-sponding eigenvector. 3. For any initial value X0 outsidea proper subspace of R^n, the solution approximates asymptotically to a non-constant periodic function Y( X0 , t ). Then the eigenvalues of A with maximal real part is a pair of conjugate complex numbers which can be computed.     

矩阵的弱相似性及其应用

推广了矩阵环Mn(F)中相似性概念，提出了矩阵的弱相似概念，研究了它的基本性质，获得一些有趣结果，此外，指出了文[3]的一个错误，给出了Laffey-Choi一个关键引理的矩阵式的证明。     

变色商品演泽缤纷时尚

变色汽车美国福特公司推出一种在公路上快速行驶时会不断改变其车身颜色的小汽车。当你在公路上看到这种汽车在你身后时,它是紫色的;当它接近你时,它就变成了红色;当它超过你的车身时,变成黑色;当它在你前面行驶时则呈现绿色;然而,当它渐渐离你远去时,却又变成了黄褐色。这种技     

论英语颜色词的使用和修辞特点

文章通过对颜色词构成的习语、谚语和名字等此类颜色词的使用特点以及颜色词所具有的比喻、夸张、象征等修辞特点的描述,使我们了解到这些丰富的颜色词汇使抽象的事物变得活泼生动,凸现了语言的张力.因此可以看出颜色词是语言学习中重要的组成部分,值得我们进一步研究.     

液压破碎锤用液压油的使用与选择

介绍了液压破碎锤对液压油的要求，提出了液压油污染和失效标准和根据石油产品的ASTM颜色的标准试验方法判断液压油是否失效的方法。并给出液压油的选择方法和国内外部分液压破碎锤厂家推荐的液压油型号。