模糊控制器输出值不变的两个充分条件

模糊控制器通常由模糊化、模糊推理以及清晰化三部分构成, 而模糊推理决定了一个由输入论域到输出论域的模糊映射. 当模糊映射为常值映射时, 任意选择模糊化和去模糊化方式, 模糊控制器的输出值不因输入信号变化而改变. 本文给出了模糊映射为常值映射的两个充分条件, 并将结论从单入单出模糊系统推广到多入单出模糊系统.     

汽车座椅部件动态组合试验台的研究

介绍了一种应用于汽车座椅部件试验检测的通用试验台,分别阐述了该试验台的构成、原理和特点.试验台集机械、电动伺服技术、气动比例控制技术、PLC控制和计算机控制技术为一体,解决了目前国内座椅试验设备存在的问题,形成了座椅试验设备的专有技术.     

基于用户聚类的协同过滤推荐方法

为了提高电子商务网站的个性化服务效率,给出了一种改进的用户聚类的协同过滤推荐方法,该算法利用用户对项目的关注的相似性来修正原始相似性计算,综合考虑用户对项目的关注和用户评价对推荐的影响.实验表明,该基于用户聚类的协同过滤推荐算法不仅减少了用户在寻找最近邻居的搜索强度,加快了推荐生成速度,而且增强了推荐算法的实时性,提高了推荐质量.     

增强型K-means聚类算法在入侵检测中的应用

异常检测是入侵检测中防范新型攻击的基本手段,本文应用增强的K-means算法对检测数据进行聚类分类.计算机仿真结果说明了该方法对入侵检测是有效的.     

基于双目视觉原理的智能测宽仪

厚钢板宽度测量是轧钢生产中一个重要的环节.介绍了光电测宽仪的工作原理和硬件构成,提出了基于双目视觉原理的厚板宽度测量方法,将测量过程分为三种情况,给出了相应的解决方案.同时,采用一阶微分期望值的亚象素边缘检测算法,有效降低了测量误差.实践验证了该方法的有效性.     

Interaction of transport resistances with biochemical reaction in packed-bed solid-state fermentors: effect of temperature gradients

Subdermal superficial liposuction, first presented by the authors at the ISAPS Congress at Zurich in 1989, is performed with thin three-hole Mercedes cannulas (diameter ranges from 1.8 to 2 mm) to treat small and secondary adiposities and to allow better skin retraction. Suction of the subdermal layer of fat reduces the thickness and consistency of the superficial fat and enhances the possibility of skin retraction. In cases where there is a large adiposity of the abdomen, arms, or inner thighs, there is a conspicuous volume of fat whose weight tends to overstretch and to carry the overlying skin downward. In these cases we need to reduce the large fat volume to permit effective skin retraction. Therefore, we apply the principles of traditional liposuction with those of subdermal superficial liposuction to aspirate large amounts of fat from all the adipose layers. We call this technique Massive All Layer Liposuction (MALL). The amount of skin shrinkage after this "defatting" procedure is remarkable and the clinical results are very good. The MALL technique can be applied to other areas as well. In our experience this new liposuction technique has dramatically reduced the indications of abdominoplasties and dermolipectomies of inner thighs and arms.     

组合测试数据生成的交叉熵与粒子群算法及比较

测试数据生成是组合测试的一个关键问题.文中提出以数理统计为基础的交叉熵方法和以仿生学为基础的粒子群优化算法来生成两两组合测试数据,交叉熵方法采用最优选择概率产生测试数据,而粒子群算法则在可行解空间中搜索具有最优适应值的测试数据.文章给出了交叉熵方法最优选择概率的理论推导,并对两种算法所生成的测试数据集进行约简.将两种算法和现有的贪心方法、代数方法及其它启发式搜索方法进行比较,实验表明交叉熵方法和粒子群算法具有一定的优势和特点.     

On the definition of the intuitionistic fuzzy subgroups

In this paper, a new kind of intuitionistic fuzzy subgroup theory, which is different from that of Ma, Zhan and Davvaz (2008) [22], [23], is presented. First, based on the concept of cut sets on intuitionistic fuzzy sets, we establish the neighborhood relations between a fuzzy point $x_a$ and an intuitionistic fuzzy set $A$. Then we give the definitions of the grades of $x_a$ belonging to $A$, $x_a$ quasi-coincident with $A$, $x_a$ belonging to and quasi-coincident with $A$ and $x_a$ belonging to or quasi-coincident with $A$, respectively. Second, by applying the 3-valued Lukasiewicz implication, we give the definition of $(\alpha ,\beta )$-intuitionistic fuzzy subgroups of a group $G$ for $\alpha ,\beta \in \{\in ,q,\in \wedge q,\in \vee q\}$, and we show that, in 16 kinds of $(\alpha ,\beta )$-intuitionistic fuzzy subgroups, the significant ones are the $(\in ,\in )$-intuitionistic fuzzy subgroup, the $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup and the $(\in \wedge q,\in )$-intuitionistic fuzzy subgroup. We also show that $A$ is a $(\in ,\in )$-intuitionistic fuzzy subgroup of $G$ if and only if, for any $a\in (0,1]$, the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$, and $A$ is a $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup (or $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup) of $G$ if and only if, for any $a\in (0,0.5]$(or for any $a\in (0.5,1]$), the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$. At last, we generalize the $(\in ,\in )$-intuitionistic fuzzy subgroup, $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup and $(\in \wedge q,\in )$-intuitionistic fuzzy subgroup to intuitionistic fuzzy subgroups with thresholds, i.e., $(s,t]$-intuitionistic fuzzy subgroups. We show that $A$ is a $(s,t]$-intuitionistic fuzzy subgroup of $G$ if and only if, for any $a\in (s,t]$, the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$. We also characterize the $(s,t]$-intuitionistic fuzzy subgroup by the neighborhood relations between a fuzzy point $x_a$ and an intuitionistic fuzzy set $A$.     

医学信息类专业《计算机组成原理》课程教学探讨

结合高等医科院校的实际情况,针对医学信息类专业的特点,探讨了《计算机组成原理》课程教学过程q-的几点心得。分别从教学内容的选择、教学方法的改进和教学实践的改革等方面作了详细的阐述。     

轮廓结构张量B-样条多尺度表示的角点检测

在B-样条多尺度空间下定义了平面轮廓在其支撑区域(ROS)内的结构张量的多尺度表示.该轮廓结构张量不但能够很好地描述轮廓的多尺度形状信息,而且其在不同尺度下的行列式乘积还能够在增强角点的响应的同时抑制噪声的影响,由此文中把B-样多尺度轮廓结构张量的乘积定义为角点的响应函数.通过实验证明了所提出的算法对于简单几何模型能够实现百分之百的检测,而针对实物图像,算法显示了良好的旋转不变性和对微小的尺度变化并不敏感的特性,最后与其他的角点检测器进行了对比实验.