互逆真蕴涵的建立过程为何要这样定义     

周训伟  鲍泓 《毕节学院学报》2006,24(6):32-35

互逆主义逻辑中的互逆真蕴涵的建立过程与经典逻辑中的实质蕴涵的定义一样,都是三真一假的真值表,但含义却不尽相同。  相似文献   

关于收缩性逆极限的注记     

魏静  赵斌  官春梅 《喀什师范学院学报》2011,32(6):8-10

在假设逆极限空间X=lim←{Xα,παβ,Λ}是λ-仿紧、投射πα为伪开映射的条件下,正规性、收缩性及次收缩性均可为其极限空间保持.为此,对逆极限保持定理的证明作了适当简化,为其他拓扑性质逆极限的简化证明提供了参考.  相似文献   

对称反循环矩阵的逆矩阵     

唐玉玲  尚兴成 《河西学院学报》2015,(2):1-9

讨论了求对称反循环矩阵逆矩阵的一般方法,并根据反循环矩阵与对称反循环矩阵的特殊关系给出几类特殊对称反循环矩阵的逆矩阵.  相似文献   

线性流形上左右逆特征值问题的最小二乘解     

李珍珠  唐耀平 《湖南科技学院学报》2011,32(8):1-5

利用矩阵的奇异值分解,研究了线性流形上实对称矩阵的左右逆特征值的最小二乘解,得到了最小二乘解的一般表达式.对于给定的矩阵,得到了它的最佳逼近解。  相似文献   

利用三维地震及模型反演技术研究薄煤层厚度及分布范围的方法     

张灯亮 《中国科技信息》2011,(4):49-51,48

针对薄煤层的厚度及其分布范围问题,提出应用三维地震及模型反演技术进行解决的方案,介绍了反演的主要过程及技术参数,并结合实例进行说明。  相似文献   

逆半环上环同余     

郝建功 《山东教育学院学报》2006,21(2):113-114

本文通过定义逆半环上的环同余,进行一系列推广。  相似文献   

Disturbance rejection control based on acceleration projection method for walking robots     

Xu-yang Wang  Zhao-hong Xu  Tian-sheng Lü 《浙江大学学报(A卷英文版)》2008,9(11):1531-1538

This paper presents a disturbance rejection scheme for walking robots under unknown external forces and moments. The disturbance rejection strategy, which combines the inverse dynamics control with the acceleration projection onto the ZMP （zero moment point）-plane, can ensure the overall dynamic stability of the robot during tracking the pre-computed trajectories. Under normal conditions, i.e., the system is dynamically balanced, a primary inverse dynamics control is utilized. In the case that the system becomes unbalanced due to external disturbances, the acceleration projection control （APC） loop, will be activated to keep the dynamic stability of the walking robot through modifying the input torques. The preliminary experimental results on a robot leg demonstrate that the proposed method can actually make the robot keep a stable motion under unknown external perturbations.  相似文献   

基于逆概率的变精度粗糙集模型     

陈志恩 《宁夏师范学院学报》2008,29(3):16-18

从经典的概率粗糙集模型出发,参照Bayes因子,研究了一种基于逆概率的变精度粗糙集模型,该模型不受先验概率的影响,从而减小了决策失误的风险.  相似文献   

Deadzone compensation based on constrained RBF neural network     

Chiung-Hsin Tsai  Han-Tung Chuang 《Journal of The Franklin Institute》2004,341(4):361-374

In this paper, a modified adaptive neural network for the compensation of deadzone is described, and simulated on a hydraulic positioning system, in which the dynamic model is separated into a series of connection of a nonlinear (deadzone) subsystem and a linear plant. The proposed approach uses two neural networks. One is the radial basis function (RBF) neural network, which is used for identifying parameters of deadzone. Based on the penalty function used in optimization theory, a multi-objective cost function with constraint is adopted to provide the best deadzone approximation. The result is used to train the other neural network for the inverse compensation of deadzone. The RBF neural network also generates the parameters of the linear plant for the design of an adaptive controller. A convergence analysis for the network training process is also presented.  相似文献   

导出反平方力场中质点运动轨迹方程的一种简易方法     

戴志福 《蒙自师范高等专科学校学报》1995,(2)

本文介绍了偏心率矢量R(也称Runge-lenz矢量)以及利用矢量R导出反平方有心力场中质点运动轨迹方程的方法,并讨论了有关的问题。  相似文献