基于最小二乘互相关算法的图像定位匹配研究

提出了一种基于最小二乘互相关的图像定位匹配算法。该算法将图像互相关信息和最小二乘法结合实现图像定位匹配,匹配精度可以达到亚像素甚至1/100像素级,同时利用金字塔分层来提高定位匹配速度;通过本算法在印刷品质量自动化检测系统中的应用,验证了该算法的高精度与高速度特性。1     

激光辐照光学材料热力效应的解析计算和损伤评估

光学元件的损伤是高功率激光技术发展的一个瓶颈，为此以连续CO2激光辐照K9玻璃为例，研究了连续激光辐照光学材料的热力损伤机理。通过积分变换方法，求解热传导和热弹性力学方程组，由此得到激光辐照引起的温度场和热应力场的瞬态分布。研究中发现在高斯光束作用下，热扩散长度的概念不再适用，因此通过曲线拟合方法，推导出最大热应力的位置与辐照时间的关系，并由此计算出材料的损伤阈值。由于K9玻璃的应力损伤阈值小于熔融损伤阈值，因此当激光作用引起的环向热应力大于材料的抗拉强度时，材料发生永久性损伤，损伤形态为拉伸解理。将理论模型的相关结论与实验结果相对比，两者吻合得很好。     

A Gauss–Seidel type solver for the fast computation of input-constrained control systems

An important class of nonlinear control systems can be represented as the feedback interconnection of two parts: a linear time-invariant system and a block of decentralized nonlinearities. When the linear time-invariant part has a nontrivial feedthrough term or the nonlinearity has a feedback gain, control computation involves the online implementation of a multivariable algebraic loop which must be resolved at each sampling instant. The requirements for such online computation may result in several implementation issues, especially in real-time and embedded control applications. This paper considers the implementation of such algebraic loops arising from several input-constrained systems. The proposed solution algorithm is globally convergent for a very large class of feedthrough or feedback gains and shows promise for real-time and embedded control applications where a fast but approximate solution is of the essence.     

Optimum active and inert ratios for different metamorphic grade coals

In order to quantitatively describe the difference of optimum active and inert ratio of various metamorphic grade coking coals,the rule of coke micro-strength index (MSI),determinated by adding different proportions of inert content to ten kinds of single coal,changing with active and inert ratio has been investigated.Three kinds of change rule of the MSI of ten kinds of single coal changing with active and inert ratio have been obtained in the research.It has been demonstrated that Gauss curve model is the optimal model to describe the optimum active and inert ratio of different metamorphic grade coals.On this basis,the optimum active and inert ratio of different metamorphic grade coals can be given.     

回顾看涨幂期权的定价

根据风险中性定价原理,借助几何Brown运动击中双边障碍时刻的分布,给出了回顾看涨幂期权的定价公式.     

A fuzzy hierarchical operator in the grey wolf optimizer algorithm

The main goal of this paper is to study the performance of the Grey Wolf Optimizer (GWO) algorithm when a new hierarchical operator is introduced in the algorithm. This new operator is basically a hierarchical transformation that is inspired in the hierarchical social pyramid of the grey wolf. This proposed operator is applied to the simulation of the hunting process in the algorithm and has 5 variants that are explained in more detail in this paper (centroid, weighted, based on the fitness and two variants using fuzzy logic). Notably the variants having the greatest impact in the GWO performance are based on the use of fuzzy logic. We also present the motivation and results of experiments, as well as the benchmark functions that were used for the tests that are presented. In addition we are presenting a comparison among all methods for 30, 64 and 128 dimensions and we conclude that the performance of the Hierarchical GWO algorithm is better when using a fuzzy variant of the hierarchical operator.     

HEXHOOP: Modular Templates for Converting a Hex-Dominant Mesh to an ALL-Hex Mesh

This paper presents a new mesh conversion template called HEXHOOP, which fully automates a con-version from a hex-dominant mesh to an all-hex mesh. A HEXHOOP template subdivides a hex/prism/pyramid element into a set of smaller hex elements while main-taining the topological conformity with neighboring elements. A HEXHOOP template is constructed by assembling sub-templates, cores and caps. A dicing template for a hex and a prism is constructed by choosing the appropriate combination of a core and caps. A template that dices a pyramid without losing conformity to the adjacent element is derived from a HEXHOOP template. Some experimental results show that the HEXHOOP templates successfully convert a hex-dominant mesh into an all-hex mesh. ID="A1" Correspondence and offprint requests to: K. Shimada, Department of Mechanical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213–3890, USA. E-mail: shimada@cmu.edu     

在f=p3情形下高斯和的计算

在前导子f=p^3情形下对带有狄利克雷特征标的高斯和。利用数论中的一些定义，定理和结论。给出具体计算。得出精确的具体合同式。     

电磁场边界条件的一种新推导方法

对由不同煤质所组成的电磁场场域，当分界面上场的散度源和旋度源不为零时，场量将在分界面两侧发生突变，通常使用的单一煤质区域中的斯托克斯公式不再适用这种情况，推广了单一煤质中的斯托克斯公式，得到了适用于多媒质区域的多曲面斯托克斯公式，对于由不同煤质所组成的电磁场场域，利用所推广的多曲面斯托克斯公式，给出了电磁场边界条件的一种新的推导方法，所推导的公式对于由多种媒质组成的矢量场有广泛应用。     

基于支持向量机的视频字幕自动定位与提取

视频字幕蕴含了丰富语义 ,可用于对相应视频流进行高级语义标注 .文中首先将原始图像帧分割为 N× N的子块 ,提取每个子块的灰度特征 ;然后使用预先训练好的 SVM分类机进行字幕子块和非字幕子块的分类 ;最后结合金字塔模型和后期处理过程 ,实现视频图像字幕区域的自动定位提取 .实验表明文中方法取得了良好的效果