高职类院校"嵌入式系统"教学思考

本文根据嵌入式系统的教学特点和高职类院校人才培养的目标,分析了高职类院校嵌入式系统教学的现状与特点、并对如何改进嵌入式教学现状、如何才能更好地培养出满足社会需求的高素质嵌入式技术人才提出了几点建议.     

基于Matlab的计算机辅助电路分析

结合若干经典电路的分析实例,如二阶欠阻尼电路的零输入响应、频率响应及二端口电路阻抗匹配的计算等,针对烦琐的计算和公式推导,提出了Matlab编程的方法加以解决,并给出了具体的Matlab电路分析程序。将Matlab软件作为电路分析工具,通过计算机仿真实验来分析和解决电路问题,方便直观,运算效率更高,值得推广。     

The vulnerability of structures to unforeseen events

A structure is vulnerable to an unforeseen event if it is not sufficiently robust. One insight into the lack of robustness is gained through the vulnerability of a structure to disproportionate collapse. In this paper, the importance of assessing the vulnerability of a structure to unforeseen events is highlighted and the nature of unforeseen events examined. A theory of structural vulnerability which examines the form of the structure to determine the most vulnerable sequence of failure events is briefly described. The potential for damage to propagate through a structure is examined through a new measure of hazard potential and vertical pushover analysis. An analysis of an example structure shows that such an approach is able to capture the weaknesses in a structure either due to form or external actions.     

Segmented software cost estimation models based on fuzzy clustering

Parametric software cost estimation models are based on mathematical relations, obtained from the study of historical software projects databases, that intend to be useful to estimate the effort and time required to develop a software product. Those databases often integrate data coming from projects of a heterogeneous nature. This entails that it is difficult to obtain a reasonably reliable single parametric model for the range of diverging project sizes and characteristics. A solution proposed elsewhere for that problem was the use of segmented models in which several models combined into a single one contribute to the estimates depending on the concrete characteristic of the inputs. However, a second problem arises with the use of segmented models, since the belonging of concrete projects to segments or clusters is subject to a degree of fuzziness, i.e. a given project can be considered to belong to several segments with different degrees.This paper reports the first exploration of a possible solution for both problems together, using a segmented model based on fuzzy clusters of the project space. The use of fuzzy clustering allows obtaining different mathematical models for each cluster and also allows the items of a project database to contribute to more than one cluster, while preserving constant time execution of the estimation process. The results of an evaluation of a concrete model using the ISBSG 8 project database are reported, yielding better figures of adjustment than its crisp counterpart.     

基于干涉原理测量溶液浓度变化分布的实时系统仿真实现

实验利用数字全息干涉技术对电极反应过程中溶液浓度变化分布进行测量。运用基于直方图的自适应滤波方法和基于形态学滤波的固液界面提取方法,解决了每更换一次实验数据都要人工识别和更换滤波参数以及手动去除固侧干扰信息的难题,为实现从摄像机实时读取数据、实时处理、测量和观察提供了仿真依据。     

IP地址的可持续使用研究与定位

针对IP资源的可再利用,提出了对IP协议的改进,在理论上进行了有益的探索,在概述IP协议的基础上针对IP资源被耗尽的问题提出了对IP协议的改进,以使IP资源可持续利用;并在改进IP协议的过程中带了一种附加效益,即利用改进后的IP协议对网络设备进行简便而准确的地理定位。并阐述了改进后IP地址的结构和面临的问题。     

线性系统求解中迭代算法的GPU加速方法

在求解线性系统时,迭代法是一种基本的方法,特别是在系数矩阵为大规模稀疏矩阵的情况下,高效地使用迭代法求解变得十分重要。本文通过分析迭代法的一般特点,提出了使用具有强大计算能力和存储带宽的GPU加速迭代法的一般方法。利用这些方法,在两种主流GPU平台上实现了一个经典的迭代法PQMRCGSTAB,并且针对不同的GPU平台特点提出了具体的优化方法。与AMD Opteron 2.4GHz 4核处理器相比,双精度版本的PQMRCGSTAB算法经NVIDIA Tesla S1070加速后性能提高31倍,经AMD Radeon HD 4870 X2加速后性能提高9倍。     

高性能计算中处理器功耗特征的评测与分析

高性能计算系统的系统结构和应用模式与单机系统或商用机群服务器系统都有很大的不同,掌握功耗特征是提高能效的前提。本文将支撑功耗管理的低功耗技术分为动态资源休眠和动态速率调节两类,并就处理器的这两类机制在高性能计算中的应用进行评测,验证了功耗管理在高性能计算中的有效性,量化分析了处理器功耗特征,指出了当前管理方案的不足及改进设想,对进一步能耗优化有重要的指导意义。     

一种基于.Net Framework文件加密方案的构建

本文介绍了一种简明高效的文件加密方案,先用两种对称加密算法组合加密明文,再用公钥加密算法对对称算法的密钥进行数字签名.该方案结合了对称加密算法的加密速度和公钥加密算法对密钥管理和分发的优势,可以大幅度提高抵御已知明文攻击的能力,有效保证信息交互安全和效率.与传统加密不同,该方案是基于.NET平台突出的安全体系结构上,大大降低了数据安全方面的投入,减少了来自数据安全的压力.