基于并行处理的一种新型有效的网络架构 BSN-MOT

摘 要：结合BSN及MOT架构的双重优势,提出一种新型的双层架构体系BSN-MOT(mesh of tree),并研究了其上的拓扑性质及在并行处理中应用的基本的通信操作算法。算法包括行、列树广播、单向广播、数据求和、矩阵乘积、最短路径路由及多项式求根。最后,本文通过与其他2种有效的树形双层网络架构Multi-Mesh of trees(MMT)及OMULT比较说明,基于BSN-MOT架构的通信算法要比其他2种网络有着更小些的时间复杂度,且BSN-MOT是一种更具有竞争力的体系结构形式。     

压缩感知中基于变尺度法的贪婪重构算法的研究

首先将最优化方法中的梯度法与贪婪算法相结合,在已有梯度追踪算法的基础上提出了基于变尺度法的梯度追踪（VMMGP）算法,分析比较这些算法的计算复杂度和存储需求;其次用这些算法分别重构一维、二维信号,分析比较了算法重构效果及其性能好坏。实验结果表明,对于一维信号和二维信号的重构,所提出的VMMGP算法,重构效果是所有梯度追踪算法中最好的。     

基于多级滤波的感兴趣边缘检测算法

针对边缘检测过程中阈值难确定和提取干扰边缘较多的问题,提出了一种基于多级滤波的感兴趣边缘检测算法。该算法分为四个步骤:首先对图像进行平滑滤波;之后计算水平方向和垂直方向的梯度幅值图像和梯度方向图像;然后根据梯度方向图像对梯度幅值图像进行噪声边缘滤波,并对梯度幅值图像进行非最大值抑制;最后对滤波后的梯度幅值图像进行分割,对得到的边缘映射图进行边缘跟踪,获取所有的边缘段及其特征,并滤除不满足特征约束的边缘,得到感兴趣的边缘。试验结果表明本文算法有很好的适用性。     

基于改进的形态学灰度图像边缘检测算法

针对传统形态学在边缘检测算法上存在的检测边缘错位、较粗等缺点,在传统形态学的基础上,提出了一种具有方向估计性的梯度算子。该算法通过改进的梯度算子及多结构元素模式来获取梯度方向,并沿边缘梯度方向进行非极大值抑制,以此细化边缘宽度,最终获取图像边缘。实验结果表明,相对传统形态学边缘检测算法,该算法具有更精细的检测结果与较强的抗噪能力。     

桥梁新型横向金属阻尼器研究

基于桥梁对横向金属阻尼器的抗震性能需求,在现有钢阻尼器研究成果的基础上,提出了一种适用于桥梁横向的新型金属阻尼器。然后阐明其力学性能,并提出了金属阻尼器的优化设计方法。最后,制作金属阻尼器试件进行了拟静力试验。研究结果表明,新型金属阻尼器具有很好的滞回耗能特性,滞回模型可采用等效双线性模型,同时具有很大的位移能力(漂移率大于50%),并且能够很好地适应地震过程中复杂的接触条件,不同三角形钢板具有很好的同步性。     

The geodesic dynamic relaxation method for problems of equilibrium with equality constraint conditions

This paper presents an extension to the existing dynamic relaxation method to include equality constraint conditions in the process. The existing dynamic relaxation method is presented as a general, gradient‐based, minimization technique. This representation allows for the introduction of the projected gradient, discrete parallel transportation and pull back operators that enable the formulation of the geodesic dynamic relaxation method, a method that accounts for equality constraint conditions. The characteristics of both the existing and geodesic dynamic relaxation methods are discussed in terms of the system's conservation of energy, damping (viscous, kinetic, and drift), and geometry generation. Particular attention is drawn to the introduction of a novel damping approach named drift damping. This technique is essentially a combination of viscous and kinetic damping. It allows for a smooth and fast convergence rate in both the existing and geodesic dynamic relaxation processes. The case study was performed on the form‐finding of an iconic, ridge‐and‐valley, pre‐stressed membrane system, which is supported by masts. The study shows the potential of the proposed method to account for specified (total) length requirements. The geodesic dynamic relaxation technique is widely applicable to the form‐finding of force‐modeled systems (including mechanically and pressurized pre‐stressed membranes) where equality constraint control is desired. Copyright © 2014 John Wiley & Sons, Ltd.     

Few views image reconstruction using alternating direction method via ‐norm minimization

In the medical computer tomography field, total variation (TV), which is the ‐norm of the gradient‐magnitude images, is widely used as the regularization based on the compressive sensing theory. To overcome the TV model's disadvantageous tendency of uniformly penalize the image gradient and over smooth the low‐contrast structures, an iterative algorithm based on the ‐norm optimization of the finite difference is proposed. To rise to the challenges introduced by the ‐norm minimization, the algorithm uses the alternating direction method to solve the unconstrained augmented Lagrangian function, which involves a hard thresholding method, a linearization and proximal points technique for each subproblem. The simulation demonstrates the conclusions and indicates that the algorithm proposed in this article can obviously improve the reconstruction quality. © 2014 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 24, 215–223, 2014     

计量比对在基层法定计量检定机构中的实践及作用

研究从县级法定计量检定机构的角度出发,阐述了计量比对在确保量值准确可靠、提升技术人员检测水平、验证管理体系运行有效性等方面的实际重要意义,并对基层技术机构开展计量比对现状进行分析,提出建议。     

浅谈福建省电子信息产业标准化体系

文中简要介绍福建省电子信息产业发展现状、标准化体系的现状,以体系角度来构建福建省电子信息产业标准化体系结构框架,通过统计分析标准明细表,指出当前电子信息产业标准化体系存在的问题,并为今后工作重点指明方向。     

宽幅高速低雾度BOPP高收缩烟膜工艺研究

研究了宽幅高速双拉设备制取的BOPP高收缩烟膜在生产及储存过程中雾度的变化情况。对比分析拉伸倍率、拉伸温度、定型温度、横拉出口冷却温度对BOPP收缩膜雾度变化的影响,结果表明:在相同的配方条件下,采用低拉伸温度、高拉伸倍率、低定型温度、低冷却温度,可制得低雾度BOPP高收缩烟膜,且雾度不会随着时间推移而明显的增大。