文章给出了一种新的8样条曲线曲面光顺算法，该算法以型值点的变动量为未知量，以型值点变动量的变动范围为约束条件，给出能量函数；通过遗传算法对能量函数最小化求解，直接得到光顺后的新的型值点；最后给出实例，表明该B样条曲线曲面光顺算法是一种有效的光顺算法。

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It continues to surprise that the subject of Electrical and Electronic Engineering does not draw more young people into the profession, either at Technician or Graduate Engineer level. It is rewarding, both financially and intellectually, whatever the particular role chosen. There are exciting roles for every personality, both for men and women, in manufacturing, produc- tion, design, R&D, teaching, management...the list is long; and there are opportunities for travel. Above all perhaps, it is a profession that provides service to the community, whether through the technology of a washing machine, a mobile phone, a laptop, satellite communications, the electrical power system, new renewable generating equipment, electric vehicles both on and off rails...that list is even longer. Engineers are the driving force that brings ideas from the drawing board to the marketplace. A widely publicized fact is the decline in uptake of science, technology, engineering and mathematics (STEM) subjects in schools and colleges. Yet businesses regularly report a shortage of young people with STEM skills. How can a modern technological economy thrive without them? Why might this be the case? A recent survey by the Institution of Engineering and Technology suggests a number of issues: •A lack of relevant subject material in the curriculum. •STEM subjects are viewed as hard so that, in an environment where there is an emphasis on getting good grades, there is a perceived difficulty in getting a good grade in STEM. •The learning process is passive with less and less time spent on practical work. •Perceptions about success in STEM are negative, the technologically adept being seen as ‘nerds’. This extends into careers such that students don’t perceive STEM subjects as a passport to lucrative and interesting jobs. An added concern is the lack of women in the profession, the result, perhaps, of outdated views of engineering. We hope then that the subject material of this the eleventh edition of Hughes will help you extend your own knowledge of STEM subjects, and that you will be encouraged to pursue a career in Electrical and Electronic Engineering. When studying gets hard, as it invariably does, remember the huge range of exciting opportunities within the profession and that there is a well-documented and continuing shortage of Technician and Graduate engineers. We might claim that this is the fiftieth birthday edition of Hughes, the preface to the first edition having been written in April 1959. It is an honour to be editors of the book, earlier editions of which illuminated our own xviii PREFACE TO THE ELEVENTH EDITION undergraduate studies, as it passes this landmark. Once again, we acknowl- edge the support of our families during the course of preparation of this new edition, which is dedicated to our respective wives, Wendy and Judy. John Hiley Keith Brown Heriot Watt University, Edinburgh August 2011

针对数值预报存在误差的基本事实，提出了一套利用历史相似资料订正数值预报的方案。利用2003-2008年T213L31数值预报产品和1948-2007年的NCEP资料，建立了100～1000hPa等压面的高度场、温度场、风场、垂直速度场和水汽场的24～240h预报的24h变量订正方程。采用24h变量相关系数和均方根误差两个指标，对2009-2010年的T213，L31高度场和温度场、数值预报产品的试应用订正效果进行了检验。结果表明：以24h变量相关系数衡量，高度场和温度场预报订正效果都是正面的，预报时效为9

为便于对水下航行器的运动弹道和运动控制进行计算机仿真，建立一种基于Matlab/Simulink 的水下航行器模型。利用矢量化建模方法，给出水下航行器6 自由度空间运动数学模型，详细论述Simulink 建模过程和S 函数的实现方法，并应用所建立的Simulink 模型，对水下航行器的开环运动、操纵性以及闭环运动控制相关问题进行仿真。仿真结果表明，该系统符合水下航行器的实际运动规律。

为准确分析车桥之间的相互作用，根据达朗贝尔原理推导出了车桥系统动力平衡方程。通过位移协调方程及车桥相互作用联系方程，将车桥两系统耦合起来并通过ANSYS实现。数值算例表明：运用基于ANSYS车桥耦合动力分析方法所得结果与利用振型叠加法所得结果吻合良好，表明该方法是正确而有效的，可用于分析各种车桥耦合振动问题。

版本：11.0.61030.0 Microsoft Visual C++ 2012 SP1 Redistributable Package (x64) 安装在未安装 Visual C++ 2012 的计算机上运行使用 Visual C++ 开发的 64 位应用程序所需的 Visual C++ 库的运行时组件。 此软件包安装 C Runtime (CRT)、Standard C++、ATL、M FC、OpenMP 和 MSDIA 库 的运行时组件。对于支持并行部署模式的库（CRT、SCL、ATL、MFC 和 OpenMP），这些运行时组件安装在支持并行程序集的 Windows 操作系统版本的本机程序集缓存中，这一缓存也称为 WinSxS 文件夹。

包含内容： DDOS攻击与社会工程学 DNS系统安全 Unix安全 WEB应用安全 windows安全 安全防御基础 暴力破解 恶意代码防范 风险评估和灾难恢复 国际安全标准 通信网络安全 通信网络安全法规与政策 通信网络安全防护相关标准 网络安全设备 无线安全 嗅探与欺骗技术 溢出攻击与提权

对网络拓扑发现进行了概述,对现有算法优缺点进行了分析,设计了一种分层次的 拓扑发现算法。首先提出基于 SNMP协议的网络层拓扑发现算法,重点解决了多路由器的问 题,然后又提出了基于地址转发表的链路层拓扑发现算法,主要通过虚拟根交换机的思想实现 拓扑发现,最后通过这2种算法的有机结合,对基于 IP网的网络层和链路层2方面都实现完整 的拓扑发现。