Geodesic Matching with Free Extremities

In this paper, we describe how to use geodesic energies defined on various sets of objects to solve several distance related problems. We first present the theory of metamorphoses and the geodesic distances it induces on a Riemannian manifold, followed by classical applications in landmark and image matching. We then explain how to use the geodesic distance for new issues, which can be embedded in a general framework of matching with free extremities. This is illustrated by results on image and shape averaging and unlabeled landmark matching. Laurent Garcin is a former student of the Ecole Polytechnique. He obtained his Ph.D. in 2004 at the Ecole Normale de Cachan, working on matching methods for landmarks and images. He is an engineer at the French National Geographic Institute. Laurent Younes is a former student of the Ecole Normale Superieure in Paris. He was awarded the Ph.D. from the University Paris Sud in 1989, and the thesis advisor certification from the same university in 1995. He works on the statistical analysis of images and shapes, and on modeling shape deformations and shape spaces. Laurent Younes entered CNRS, the French National Research Center in October 1991, in which he has been a “Directeur de Recherche" until 2003. He is now a professor at the Department of Applied Mathematics and Statistics Department and the Center for Imaging Science at Johns Hopkins University in July 2003.     

机械动力参数微机测量系统的研制

本介绍了一种机械动力参数测量系统,该系统使用微机,传感器和简单的信息处理电路实现转速,扭矩,功率,效率等参数和外特 性曲线的测量,系统以Windows为操作平台,具有实时监测,数据保存与打印,曲线绘制等功能。     

基于一种新的基因操作策略的改进遗传算法

提出一种新的基因操作策略,该策略利用单纯形法的思想产生新样本,将遗传算法寻优的随机性与传统算法寻优的方向性有机地结合在一起.仿真结果表明,将改进的遗传算法用于训练神经网络辨识器,可提高收敛速度和模型拟合精度.     

磺胺二甲嘧啶的东北细毛关体内的代谢动力学研究

选用紫外分光光度计法,研究了静脉推注磺胺二甲嘧啶(SM2)后,在成年东北细毛羊体内的药物代谢动力学过程.主要药物代谢动力学参数初始血药浓度(A)为(17.6359±2.57)mg@L-1,分布半衰期(t1/2α)为(0.3006±0.04)h,消除半衰期(t1/2β)为(4.6635±1.53)h,消除速率常数(β)为(0.1486±0.051)h-1,总清除率(CLB)为(0.6677±2.86)100mL@kg-1@h-1,中央室消除速率常数(Ke1)为(0.2763±0.035)h-1,总表观分布容积(Vd)为(4.4933±0.37)100mL@kg-1,有效抑菌浓度维持时间(Tcp)为8.56h,药一时曲线下面积(AUC)为(149.7732±19.45)mg@L-1.h-1.为此,确认磺胺二甲嘧啶(SM2)对东北细毛羊为短效药物.     

异步电动机定、转子电阻参数在线实时估计方法

给出了一种异步电动机定、转子电阻参数在线实时估计方法,并将其应用于电压控制型转差频率矢量控制系统,计算机仿真结果表明该方法具有较好的参数估计效果。     

A new learning method using prior information of neural networks

In this paper, we present a new learning method using prior information for three-layer neural networks. Usually when neural networks are used for identification of systems, all of their weights are trained independently, without considering interrelated weights values. Thus, the training results are usually not good. The reason for this in that each parameter has its influence on others during learning. To overcome this problem, we first give an exact mathematical equation that describes the relation between weight values given a set of data conveying prior information. The we present a new learning method that trains part of the weights and calculates the others using these exact mathematical equations. This method often a priori keeps the given mathematical structure exactly the same during learning; in other words, training is done so that the network follows a predetermined trajectory. Numerical computer simulation results are provided to support this approach. This work was presented, in part, at the Fourth International Symposium on Artificial Life and Robotics, Oita, Japan, January 19–22, 1999.     

Dynamic problems of shape optimal design for shallow curved plates

The problem of optimal structural design of shallow thin-walled elements such as curved rectangular plates are formulated and solved for dynamic conditions. The distribution of the initial curvature of shallow plates in a nonstrained state is taken as the control function. Dynamic compliance is considered as the minimized performance functional. Optimality conditions are derived for the distributed parameter system considered and applied for the construction of the analytical solution. The rigorous analysis of extremum conditions and behavioural equations shows that the initial optimization problem is decomposed into several problems of classical structural analysis, which can be successfully solved analytically. Some optimal designs obtained for rectangular plates under stretching and bending, and a plate lying on an elastic foundation and subjected to lateral forces are presented. Received: November 27, 1998     

围术期麻醉深度的模糊控制

针对手术过程中麻醉深度的控制问题,提出了一种PID参数自整定模糊控制策略。应用这种方法对麻醉过程中平均动脉血压的控制进行了计算机仿真研究,获得了良好的仿真结果。理论分析和仿真结果证明了此方法的准确性和可靠性,为围术期麻醉深度的控制提供了一种新方法。。     

中型山区河流水电站下游的鱼类生态需水量计算

为更好地对河流水电开发后的鱼类进行保护,探讨中型山区河流水电站下游的鱼类生态需水量计算.参照大型河流鱼类水力生境参数标准,根据中型山区河流的特点,得到中型山区河流鱼类水力生境参数的参考标准.选取有代表性的四川中型山区河流杂谷脑河进行鱼类生境原型观测,原型观测结果证实了该参考标准能够满足杂谷脑河鱼类对生境的实际需求.基于所得到的参考标准,应用生态水力学法对杂谷脑河红叶二级、理县以及甘堡3座电站减水河段的鱼类生态需水量进行计算分析,得到3座电站的生态需水量推荐值.通过分析可知,所得到的生态需水量推荐值占年均天然流量以及设计引用流量的比例都不高,在3座电站的运行实践中,具有可操作性.     

Modified alternating direction-implicit iteration method for linear systems from the incompressible Navier–Stokes equations

In order to solve the large sparse systems of linear equations arising from numerical solutions of two-dimensional steady incompressible viscous flow problems in primitive variable formulation, Ran and Yuan [On modified block SSOR iteration methods for linear systems from steady incompressible viscous flow problems, Appl. Math. Comput. 217 (2010), pp. 3050–3068] presented the block symmetric successive over-relaxation (BSSOR) and the modified BSSOR iteration methods based on the special structures of the coefficient matrices. In this study, we present the modified alternating direction-implicit (MADI) iteration method for solving the linear systems. Under suitable conditions, we establish convergence theorems for the MADI iteration method. In addition, the optimal parameter involved in the MADI iteration method is estimated in detail. Numerical experiments show that the MADI iteration method is a feasible and effective iterative solver.