Design and Implementation of a Novel Algorithm for Iterative Decoding of Product Codes

A novel product code iterative decoding algorithm and its high speed implementation scheme are proposed in this paper.Based on partial combination of selected columns of check matrix,the reduced-complexity syndrome decoding method is proposed to decode sub-codes of product code and deliver soft output information.So iterative decoding of product codes is possible.The fast sorting algorithm and a look-up method are proposed for high speed implementation of this algo-rithm.Compared to the conventional weighing iterative algorithm,the proposed algorithm has lower complexity while offering better performance,which is demonstrated by simulations and implementation analysis.The implementation scheme and verilog HDL simulation show that it is feasible to achieve high speed decoding with the proposed algorithm.     

新型复合球铰运动副的研究设计

分析三重复合球铰摆角运动范围，并将该结构应用到一种四轴驱动的虚拟轴机床上作动平台，并对其结构进行了初步设计。     

Abnormal piezoresponse behavior of Pb（Mg1／3Nb2／3）O3-30% PbTiO3 single crystal studied by high vacuum scanning force microscopy

The piezoresponse behavior dependence of the Pb(Mg1/3Nb2/3)O3-30%PbTi03 single crystal on the vacuum degree has been investigated by scanning force microscopy in the piezoresponse mode under high vacuum. Unusual piezoresponse behavior related to the screening charges compensation mechanism is observed on the (111) crystal face. The significant piezoresponse degradation behavior with low piezoresponse signal under high vacuum is attributed to the instability of the polarization state due to the insufficient compensation of the intrinsic screening charges for the polarization charges in PMN-30%PT single crystal. In contrast, the remarkable domain contrast of the sample at ambient pressure is owing to the dominant surface screening charges deriving from surface adsorption, which plays an important role in determining the stability of the domain behavior and in achieving the optimal properties.     

一类反应扩散模型的行波解

主要讨论了一类反应扩散模型的行波解，并得到了一类单调下降的波前解。     

表面波法在防渗墙质量检测中的应用研究

本文建立了平面应力问题的波动方程，推导了防渗墙（平面应力问题）中瑞利波特征方程，通过算例与平面应变问题中瑞利波特性进行了比较。本文介绍了防渗墙质量检测的一种方法：表面波法，对它的测试原理作了进一步的研究。利用超声波跨孔法和表面波法对某实际工程进行了检测，经过实例证明超声波跨孔法和表面波法相结合可准确检测防渗墙的质量，并且可降低大量的检测费用。     

屏幕压缩传输演示系统中的关键技术研究

简要介绍了一种基于局域网内多媒体压缩传输技术的教学演示系统应用方案设计，并针对其中的几个关键技术提出了解决方案。     

全数字化高载波SPWM变频调速系统的研究

研究用IGBT作开关元件的高载波SPWM变频调速系统的全数字控制．提出一种采用IN－TEL8031和专用集成电路SLE4520的控制方案，介绍了系统的工作原理与结构，控制算法和软件编制，给出了试验结果．     

楔形正挤凹模轮廓的改进

论述了改进楔形凹模轮廓的原理和方法，即通过改变楔形凹模入口的形状，达到降低板坯正挤挤压力的目的，并通过实例与原楔形凹模作了比较．     

一种同时求解电路全部响应对全部参数灵敏度的算法

给出了一种电路灵敏度分析的新方法，只要能建立电路的改进节点方程，且该方程的系数矩阵的逆存在，就可同时求得全部响应（节点电压、电压源电流）对各参数的微分灵敏度，该法尤其适用于在电路设计时需同时求多个输出对多参数灵敏度的场合，而采用灵敏度网络法或伴地则需求解多次，另外，对电路作适当预处理，可以同时求得有关支路电流响应对各参数的灵敏度，按文中的方法编制了软件，经多个算例验证，方法是有效、可皓