预优矩阵及其构造技术

为达到预处理共轭梯度法(PCG)提高收敛速度，克服数值不稳定性目的，给出了构造预优矩阵的条件，并构造了三个典型的预优矩阵。它们是不完全Cholesky因子预优矩阵，对角预优矩阵和利用SSOR法导出的预优矩阵，且在PCG中是应用效果很好的预优矩阵。     

多值依赖无分裂覆盖问题的研究

基于函数依赖规范化理论及多值依赖基本概念，给出了多值依赖的分裂、无分裂多值依赖集等定义，提出了满足无分裂多值依赖集的良好特性，以及无分裂多值依赖集的判定算法，并且提出分裂多值依赖集存在无分裂覆盖满足的条件及其算法．这对于多值依赖集化简、规范化设计和无环数据库设计提供了理论基础．     

光滑流形在(Z2)2作用下信息为{(2,2,0),(2,0,2),(0,2,2)}的上协边类

设(Z2)^2作用于光滑闭流形M^n，其不动点集的法丛的信息为P＝{(2，2，0)，(2，0，2)，(0，2，2)}，Jn^4，2(P)是有代表元M^n且具有上述性质的n维上协边类[M^n]构成的集合．作者通过构造上协边环M0n的一组生成元决定了Jn^4，2(P)的群结构．     

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.     

Identification and mapping of quantitative trait loci controlling cold-tolerance of Chinese common wild rice (O. rufipogon Griff.) at booting to flowering stages

Cold injury is an important limitation of rice production. Therefore, screening for cold-tolerant genetic resources and the development of highly cold-tolerant cultivars is crucial for higher yield potential and stable yield of rice. There have been several reports on the genetic analysis and QTL mapping of the cold-tolerance at the booting stage. Toriyama et al.[1,2] and Futsuhara et al.[3,4] reported that 4 or more genes were involved in the cold-tolerance. Several QTLs at the booting sta…     

An iterative algorithm in potential-field inversion

1　Principle and MethodAll the problems of potential- field inversioncan be concluded that of solving nonlinear functionas follows:b =f( x) ( 1 )where x =( x1,x2 ,… .xn) T,xj( j =1 ,2 ,… ,n)indicate geometricparameters and physical parame-ters of the object;b=( b1,b2 ,… ,bm) T,bi( i=1 ,2 ,… ,m) indicate potential- field measurements.Main algorithms for expression( 1 ) are leastsquare method ( include damping least squaremethod ) ,gradient method ( conjugate gradientmethod and variable met…     

具有Neumann边界及临界Sobolev指数的半线性抛物方程

主要运用能量方法及稳定集和不稳定集的观点,研究一类半线性抛物方程的整体解和局部解的存在性及爆破问题.这里Ω是RN(N≥3)上的光滑有界区域,2 是临界Sobolev指数.     

基于有限元仿真结果的知识发现

提出了通过数据挖掘技术实现基于有限元仿真结果的知识发现．分析了数据挖掘的一般步骤，建立了基于有限元仿真结果的知识发现系统，论述了知识发现系统的各个模块及实现该系统的关键技术；对粗糙集和主成分分析法作了简单的介绍，并举实例对粗糙集方法作了说明．通过数据挖掘技术将计算实例提炼出来，作为一种知识源参与到设计优化过程中去，将CAE从设计验证层次提升到设计驱动层次．     

提高熔炼不锈钢电弧炉炉衬寿命的措施

某特钢厂改进熔炼不锈钢电弧炉操作工艺、造渣制度和采用炉渣发泡技术后，使电弧炉炉衬寿命从30炉提高到60炉以上，并保证2台30tEBT电弧炉与l台30tAOD妒相匹配。炉衬寿命进一步提高后，可望l台EBT电弧炉与l台AOD炉相匹配，提高不锈钢产量。     

一维抛物型方程参数识别反问题的数值解法

以函数逼近和Tikhonov正则化为基础，利用算子识别摄动法和线性化技术提出求解一维抛物型偏微分方程参数识别反问题的迭代算法，拓宽了求解此类反问题泛定方程和初边值条件的适用范围。数值模拟的结果表明，用此迭代法求解参数识别反问题具有数值精度高、稳定性好、收敛速度快的特点。