CY7C68013

研究基于互联网的在线考试系统的设计与实现，解决在线考试系统中存在的试题仓库，智能组卷，自动保存等问题。(Of Internet-based online examination system design and implementation of online examination system to resolve questions that exist in the warehouse, intelligent test paper, auto-save and other issues.)

说明：  这是一篇硕士论文：论述了矢量控制的理、坐标变换矩阵和三相异步电机的基本方程式，推导出了异步电机在不同坐标系下的数学模型，实现了异步电机转矩电流、励磁电流的解耦，然后分析、比较了无速度传感器矢量控制的各种方法的原理及优缺点，对常用的自适应法和反电动势法进行了更为详细的原理和仿真比较，并将带速度传感器控制系统的性能和无速度传感器控制系统的性能进行了比较；最后设计了模糊控制器对电机定子电阻进行在线检测，增强矢量控制系统的鲁棒性。(This is a master s thesis ： the vector control of the administration, the transformation matrix and coordinate with a three wire asynchronous the motor of the basic formula of the asynchronous motor, resulting in a different coordinate system of mathematical model, the realization of the asynchronous the motor turned the current, the solution urges, and then analyzing and my speed sensor vector control of theprinciples and commonly used to act against the law and pose a more detailed and emulation, and will take speed sensor control)

说明：  Owing to the broad application value of audio watermarking in remote transmission and mobile extraction, it is very important to study watermarking approaches against A/D and D/A conversion. Based on wavelet decomposition and cepstrum technology, an audio watermarking algorithm is proposed where the low-frequency wavelet coefficients are chosen for cepstrum transforming. Then, the obtained cepstrum data shows stable for watermark hiding by the methods of edging data cutting and statistical mean modification. The synchronization is not required in the algorithm. Experimental results show that the proposed algorithm can resist on the attack of A/D and D/A successfully with features of large capacity and zero bit error. It will be helpful for the mobile audio in secure broadcast and management in the

机载数据总线设计training幻灯片 详尽介绍AFDX 帧数据格式等(On-board data bus design training slides detailed descriptions of the AFDX frame data formats)

随着并联机构学理论的日益成熟，并联摇摆台以其大刚度、高精度和重载等优点，广泛应用于机械、航海和航天等领域。其中，以车辆模拟台的应用最为广泛。车辆在行驶过程中由于受到路况等扰动因素的影响，会产生横摇、纵倾、转艏、前冲、横移和升降共6种位姿的运动，而通过六自由摇摆台能将车辆的这些运动真实的再现出来。 本文以项目——六自由度重型摇摆台的研制为依托，在对国内外六自由度摇摆台的研究现状做了比较深入、系统分析的基础上，对车辆重型摇摆台与负载锁定结构进行了分析优化，主要的研究内容如下： 首先，对六自由度重型摇摆台进行运动学建模，分析、优化机构在六种独立姿态及部分耦合位姿情况下支撑杆的运动范围，最终确定了支撑杆合理的转角空间和上下铰链座的结构，提高了机构的运动学、动力学性能。 (With the development of theory of parallel mechanism, parallel plat quickly enters the international market for high stiffness、high precision and heavy load, which is widely used in mechanical、navigation and aviation, etc. Among these parallel plats, the vehicle simulator is the most widely used. Due to the disturbance factors of ups and downs of the different roads, vehicle has 6 degrees of freedom during its traveling movements, such as rolling、pitching、yawing、surging、swaying and heaving that can be simulated in the use of 6-DOF platform. Based on the project of heavy platform, this paper optimizes the platform and the load locking structure after the in-depth and systematic analysis of 6-DOF parallel plat at home and abroad, the main research contents are as follows: Firstly, this paper establish the kinematic modeling that is used to analyze the rotating range of the axis belonging to the supporting pole in many traveling conditions, such as one of six movements indepe)

企业档案管理系统 概要设计说明书 需自行转化为doc文件(enterprise file management system outlined the need to design brochures into doc documents)

The Sub-Department of Atmospheric Oceanic and Planetary Physics in the University of Oxford maintains an archive of Mie scattering routines for both single spheres and populations of part

讲述基于定子电流补偿理论的永磁同步电机弱磁控制策略研究(Research on Weak Magnetic Control Strategy of Permanent Magnet Synchronous Motor Based on Stator Current Compensation Theory)

JAVA企业人事管理系统的设计与实现 论文范文+毕业设计源代码+JAVA企业人事管理系统的设计与实现论文.doc(JAVA Enterprise Personnel Management System Design and Implementation)

a description for acoral(emcos)(2)