一种带有路由反射的BGP路由预测算法

由于路由反射器的影响,路由器可能只知道非常有限的到达外部目的地的路由的子集,BGP路径选择过程并不会形成一个确定的路径等级顺序,使得路径预测变得非常困难.给出了一种算法,该算法不需要对路由协议动态进行复杂的模拟,只需要静态的路由数据就可以计算出带有路由反射的路由选择结果,并在一个模拟的大型ISP上验证了预测算法的正确性.结果显示配置的改变可以引起路由表的变化.     

基于信令降频码方法的信令寻径式光纤交换机的研究

信令寻径式高速光纤交换机需要使用大量"串/并"转换器件提取信令来实现对信道的控制,这使得交换机的底板面积十分庞大,无法检测BGA封装焊接质量;针对以上问题,提出了一种使用特殊的降频码对信令进行编码,成倍地降低信令的频率,采用普通的FPGA器件即可提取信令,取代了大量占线的"串/并"转换器件,减少了PCB面积和降低了成本;并在此基础上给出了高速光纤交换机的解决方案;目前,基于信令降频码方法的信令寻径式光纤交换机已经调试成功,性能稳定,运行状态良好。     

BP神经网络隐层单元数的确定方法及实例

针对BP神经网络隐层单元数不易确定的问题,提出一种在传统的经验公式基础上快速确定隐层单元数的方法。该方法首先借助经验公式确定隐层单元数的取值范围,然后将其扩大,在这个扩大的范围内寻找最优值。以BP神经网络预测交通流量为例,解释说明了具体的步骤,以及网络模型的隐层结构对模型仿真精度的影响。结果表明,采用该方法可快速决定隐层单元数,在实例中采用16个隐层单元数为最佳。     

Simulations of the dynamic behavior of a bipedal robot with trunk and arms subjected to 3D external disturbances in a vertical posture, during walking and during object handling

This paper provides a new approach to the bipedal robot stability problems in presence of external disturbances in vertical posture of the robot, during walking and during object handling. This approach is based on synergy between the dynamic motions of balancing masses and arms to reject large perturbations applied to the upper part of ROBIAN robot. In these cases, the stabilization is carried out in the first time with a trunk having 4 degrees of freedom (dof): one rotational and three translational movements. In the second time, the stabilization is performed with a system with arms and having 10 dof. During the walk, the trunk elements of ROBIAN reproduce necessary movements to perform the dynamic walking gait of the robot. The compensation of external three-dimensional efforts applied to the robot is achieved firstly by the trunk and secondly with the arms. This study allows us to determine on-line the required movements and accelerations of the trunk elements in order to maintain the robot stability and shows the importance of the arms for the robot stability.     

The Holy Alignment: Geodesic and Astronomical Fundamentals for Calculating the Adjustment of Medieval Naves

It is commonly believed that the longitudinal axes of churches extend exactly in an east-west direction. However, thorough investigations have shown that this is not always correct; rather, both southern and northern deviations of up to about 25° can occur. The angular deviation between the church axis and true east is called the Holy Alignment. This present study presents the possibility that the nave is oriented towards the direction of the sun-rising point on the name day of the patron saint of the church. If several saints share the patronage, the Holy Alignment equals the algebraic sum of the angular distances for each saint. The orientation of a nave can be analyzed by means of common mathematical relations used in geodesy, astronomy and gnomonics. In order to perform such an analysis, it is necessary to know the history of the patronage of the church; the Gauss-Krüger coordinates of the ground plan; and characteristic astronomical quantities at the time the church was built. A calculated example with the saints Andrew, James and Philip for the year 980 illustrates the analysis. An appendix deals with the influence of atmospheric refraction on the apparent altitude of the sun near the horizon.     

大学计算机基础教学模式改革的研究与实践

本文分析了大学计算机基础课程教学模式改革的意义,提出了以多模块教学内容为载体,以网络教学为平台,以第二课堂实践教学为基地的立体教学模式。     

浅析计算机专业少数民族班级的教学方法

本文针对西部地区高校中,计算机专业的少数民族班学生学习的现状,分析了教学方法中存在的一些问题及其原因,提出了几点建议。以期对其他同类地方学校的教学起借鉴作用。     

信息与计算科学专业实践教学体系的探索与优化

信息与计算科学专业是联系数学与信息科学的一门新兴专业,目前很多学校开设了这个专业,很多学校已具有较完善的理论课程,但实践教学体系尚不完善,对学生的创新能力培养非常不利。我们经过多年的积淀,并结合专业培养目标,对信息与计算科学专业的实践教学体系进行探索与优化。     

基于工作过程的“Flash动画”教学改革与实践

本文根据"Flash动画"课程的特点,结合学院的课程教学改革项目,从课程的教学理念、教学模式、教学体系和手段等方面着手,探讨了基于工作过程的教学改革与实践,以培养出符合新时代需要的创新人才。     

“可编程序控制器原理及其应用”课程试验教学软件的研制

本文在原有的TVT-90硬件和软件实验系统基础上,用组态软件实现"可编程序控制器原理及其应用"试验的动态模拟和仿真,在计算机上实现实验过程的动画仿真,使学生在实验过程中可以进行与生产过程的交互模拟,反复验证自己的程序设计过程是否正确,并且理解真实的生产装置的控制过程。