在数字电路教学中引入现代EDA技术

介绍了CPLD／FPGA器件的特点和应用范围，并以一个简单的十二进制加法器设计为例，介绍了在MAX plusⅡ开发软件下，利用VHDL硬件描述语言以及原理图的输入方式来设计数字逻辑电路的过程和方法．     

散射场展开项中截断系数N取值的考虑

本文讨论了用T矩阵求解散射场时,散射场展开项截断系数n取值的问题。取值的原则是既要保证T矩阵方法的计算精度也要保证计算的收敛性。     

关于并行迭代区域分解算法收敛性的注记

本文给出在范数Ⅱ·Ⅱ下的收敛估计,以及相应的最优松驰因子,还讨论了这两种收敛性之间的关系.     

A Remark on Bcklund Transformation of Weingarten Surfaces

50.Intr0ducti0nInLlj,weestablishedacorrespondencebetweensolutionsofSine-Gordonequati0nandWeingartensurfacesinR3withc0ndition'K-2mH+m2+l2=O,l#0,(0'l)andgavetheBdcklundtransformationofthiskindofWeingartensurfacesintermsofso-calledDarbouxcongruence-Itisremarkablethatthisthe0ryissimilartotheclassicalthe0ryofBacklundtransformationandpseudo-sphericalcongruencebetweensurfacesofnegativeconstantGausscurvature.Inthispaper,wewanttorelatethemt0eachotherbyso-calledparalleltransformation.51.ParallelTr…     

The Hamiltonian problem on distance-hereditary graphs

In this paper, we first present an O(n+m)-time sequential algorithm to solve the Hamiltonian problem on a distance-hereditary graph G, where n and m are the number of vertices and edges of G, respectively. This algorithm is faster than the previous best known algorithm for the problem which takes O(n²) time. We also give an efficient parallel implementation of our sequential algorithm. Moreover, if G is represented by its decomposition tree form, the problem can be solved optimally in O(logn) time using O((n+m)/logn) processors on an EREW PRAM.     

绕三圆柱流体的LB模拟

介绍一个流体动力学的格子Ｂｏｌｔｚｍａｎｎ并行模拟模型．用该模型模拟了流体动力学中的绕三圆柱流体现象．利用计算机可视化技术，该模型可动态显示流体的演化过程，可以很方便的用于分析各种流体动力学现象．     

Optoelectronic symbolic substitution based canonical modified signed-digit arithmetic

A single-step optoelectronics symbolic substitution scheme to handle parallel modified signed-digit (MSD) arithmetic operations is proposed. Conversion algorithms from MSD numbers into a canonical MSD representation are provided. The canonical MSD numbers have the property that no two consecutive digits are non-zero. The addition operation of two CMSD numbers is performed in one step. It will be shown that through the use of CMSD representation, the number of symbolic substitution rules in an optical content-addressable memory (CAM) based system is significantly reduced. The number of symbolic substitution rules can be further reduced to an optimum value through a proposed shared content-addressable memory optical set-up. Further, the proposed optical scheme doubles the storage efficiency of the shared content-addressable memory.     

云计算中面向能耗降低的虚拟机多资源放置算法

为降低云计算系统产生的能耗,实现系统多类型资源的合理利用,提出虚拟机多资源能耗优化放置模型,并给出虚拟机多目标资源随机多组优化算法(RMRO)。RMRO算法随机生成多组虚拟机放置序列,并对每组序列进行优化,从中选出最优的序列作为最终的虚拟机序列。基于RMRO,进一步提出了3种虚拟机放置序列的再优化策略,通过实验对比,选择MMBA策略作为最佳策略。仿真结果表明,RMRO相比传统的MBFD和MBFH算法,能明显降低数据中心的能耗,同时使系统多种资源利用更合理。     

基于龙格-库塔的弹道微分方程解算的FPGA实现

针对火控计算中求解弹道微分方程组的速度、精确度以及资源配置间的冲突,设计了一种在FPGA硬件平台上实现、基于龙格-库塔的微分方程组求解器。通过在方程组之间以及方程内的计算步骤中采用多通道二级并行的方式实现算法硬件加速。实验结果表明,对于精度要求高、计算复杂度大的微分方程组,FPGA硬件实现的运算性能较传统的软件实现方式加速性能明显。     

Chemometric processing of second-order liquid chromatographic data with UV–vis and fluorescence detection. A comparison of multivariate curve resolution and parallel factor analysis 2

Second-order liquid chromatographic data with multivariate spectral (UV–vis or fluorescence) detection usually show changes in elution time profiles from sample to sample, causing a loss of trilinearity in the data. In order to analyze them with an appropriate model, the latter should permit a given component to have different time profiles in different samples. Two popular models in this regard are multivariate curve resolution-alternating least-squares (MCR-ALS) and parallel factor analysis 2 (PARAFAC2). The conditions to be fulfilled for successful application of the latter model are discussed on the basis of simple chromatographic concepts. An exhaustive analysis of the multivariate calibration models is carried out, employing both simulated and experimental chromatographic data sets. The latter involve the quantitation of benzimidazolic and carbamate pesticides in fruit and juice samples using liquid chromatography with diode array detection, and of polycyclic aromatic hydrocarbons in water samples, in both cases in the presence of potential interferents using liquid chromatography with fluorescence spectral detection, thereby achieving the second-order advantage. The overall results seem to favor MCR-ALS over PARAFAC2, especially in the presence of potential interferents.