Magnitude Estimations for Line Bisection Under Lateral Visuo-Spatial Neglect

Human subjects can bisect a line, with error, even when they have neglect on one side. How this skill, even though inefficient, can be represented in nonlinear psychophysical theory is explored here. A problem for previous theoretical explanations of lateral neglect bisection, where the errors of bisection are reversed in sign for brain-damaged subjects, when very short lines are used as stimuli, is shown not in fact to be a problem for N(onlinear) P(sychophysical) D(ynamics) theory at all, but is exactly what is expected to arise when sensitivities are biassed on one side. It is suggested that an imbalance in channel inputs in a nonlinear system representation has results which do not follow from a more conventional connectionist approach.     

经受侧向撞击圆管的大变形分析

对两端固支圆管经受侧向撞击时的塑性大变形进行了实验研究和理论分析，理论预测值与实验结果符合很好。     

Critical shimmy speed of nonswiveling landing-gear wheels subject to lateral loading

The paper presents a nonlinear model describing vibration of the landing gear relative to the fuselage. The model is intended to analyze the dynamic stability of nonswiveling main-gear wheels. The model is used to show that the lateral component of the fuselage speed has a significant effect on the critical shimmy speed __________ Translated from Prikladnaya Mekhanika, Vol. 42, No. 9, pp. 134–142, September 2006.     

Stability and Oscillations in a Time-Delayed Vehicle System with Driver Control

In this paper, linear stability and chaotic motion of a time-delayednonlinear vehicle system are studied. The stability is determined bycomputing the spectrum associated with a system of linear retardedfunctional differential equations, which reveals that a loss ofstability occurs following a Hopf bifurcation. Beyond the critical valuefor linear stability, the system exhibits limit cycle motions.Subharmonic, quasi-periodic and chaotic motions are observed for asystem excited by a periodic disturbance.     

基于自适应侧抑制网络的红外弱小目标检测

 为了提高远距离红外弱小目标的检测效率,提出了一种基于自适应侧抑制网络的复杂背景下的红外弱小目标检测方法。该方法建立了改进的侧抑制网络数学模型,利用各向异性滤波来自适应地确定侧抑制网络的抑制系数,不需要人为干预,实现了侧抑制网络与各向异性高斯滤波的有机结合。同时,在各向异性高斯滤波器两轴确定方面进行了改进,两轴分别采用对比度尺度模型和强度尺度传播模型来独立确定。通过与传统弱小目标检测方法的对比实验,验证了方法的有效性。     

一种基于生物侧抑制原理的星图点目标检测方法

针对星图中空间点状目标占有像素数少、信噪比低的问题,提出一种基于生物侧抑制原理的星图点目标检测方法。首先通过多级滤波对图像进行预处理,对信噪比较低的星图进行杂波抑制,其次采用一种基于生物视觉侧抑制理论的背景抑制网络模型进行二次滤波,最后采用二维熵分割提取图像中点目标。实验结果表明,该方法能够在有效地抑制图像中的强杂波背...     

基于解耦差分泽尼克待定系数法的二维横向剪切波面重建算法

横向剪切干涉术是一种自参考干涉计量技术,其原理是被检测波前与其自身被剪开的波前之间在重叠范围内相干涉,由干涉图得到两相互剪切波前的波前差,通过波面重建算法得到待测波面.在波面重建算法中,泽尼克待定系数法是其中的一种.分析了横向剪切干涉技术的测量原理;提出了一种新的基于解耦差分泽尼克待定系数法的二维横向剪切波面重建算法....     

视网膜皮层图像信号处理的传输机制与仿真

侧抑制是神经系统普遍存在的机理。从侧抑制模型出发进行了视网膜处理及传输机制的研究,提出了基于差分方程的循环侧抑制动态数学模型。通过剖析视网膜感应细胞对光刺激的反应特性,阐述了视网膜皮层电脉冲信号的发放机制,指出了视网膜输出信号是以物体边缘信息为主体的传输机制。结合循环侧抑制动态数学模型,并考虑视网膜感应细胞对光刺激的适应性,创新性地进行了图像信号传递及处理的仿真模拟。     

CCD激光测距实验

CCD激光测距实验是集光、机、电为一体的综合性实验，学生可以用简单的几何光学知识、采用激光遥感方式实现距离的非接触精确测量．本文简述了实验原理，给出了计算机自动处理和显示的系统硬件和软件环境，以及系统的校准方法，最后介绍了模拟实验结果。