数字与造型——论数字绘画技术对传统插画的冲击与渗透

数字绘画作为一种新兴的艺术形式。在艺术创作过程中,从单纯地模仿走向利用电脑程序在电脑中创作或自动生成图像,达到了一定的艺术效果。同时,它也在不知不觉中或多或少地影响了传统的插画艺术。这两种绘画方式具有各自独特的个性及美感,我们把更多的目光投向了这两种技术手段的相通性。探讨在这两者间相互影响的过程中,在超越这些"感觉材料"之上、之外,是否存在着一个共同体,构成了不同的艺术手段之间的作品。     

设计速写教学模块的分解与组合

为提高设计速写课程的教学质量,采用模块化设计法对教学结构进行研究。首先,把课程分解为艺术、技术与设计三个体系。在此基础上,将各个体系分为若干训练项目。再把每个项目细化为彼此间可组合的子模块。最后从三个体系中分别抽取若干子模块,从而组建单节课的教学内容。由于每次教学都在一定程度上均衡了多方面的要求,此方法可用于提高学生的设计速写综合能力。本文结合工业设计工科类学生进行研究,结果表明该方法是正确可行的。     

Bagging组合的不平衡数据分类方法

提出一种基于Bagging组合的不平衡数据分类方法CombineBagging,采用少数类过抽样算法SMOTE进行数据预处理,在此基础上利用C-SVM、径向基函数神经网络、Random Forests 3种不同的基分类器学习算法,分别对采样后的数据样本进行Bagging集成学习,通过投票规则集成学习结果。实验结果表明,该方法能够提高少数类的分类准确率,有效处理不平衡数据分类问题。     

基于HSI彩色空间模型的域替换降噪算法

对彩色数字图像进行降噪处理时,为兼顾标量处理法的简便性和矢量处理法的有效性,提出一种对彩色空间域实行替换的方法。采用均值滤波法在RGB域内进行滤波处理,将图像数据从RGB域转换到HSI域,用滤波处理后的H域、S域替换含有噪声的H域、 S域。对由双目内窥镜采集的实际彩色图像进行实验,结果证明该域替换法可以结合标量处理和矢量处理的优点,达到比一般标量处理法及简单矢量处理法更好的降噪效果。     

基于算法组合的人员排班方法研究

排班问题是现实生活中的常见问题.从国内某货航实际情况出发,提出了一种初步排班流程.首先采用线性规划建立班制,再依据班制用贪心算法构建班制串矩阵,以回溯方法将具体班填入班制串,进行微调后完成排班.实验表明了排班方法的合理性.     

Comparison of forecasting methods with an application to predicting excess equity premium

This paper reviews various forecast methods including combination using theoretically optimal weights and those under model selection approaches. In addition, we suggest two modified simple averaging forecast combination methods—a mean corrected and a mean and scale corrected method. We conclude that due to the fact that real data is usually subject to structural breaks, rolling forecasting scheme has a better performance than fixed window and continuously updating scheme. In addition, methods that use less information appear to perform better than methods using all the sample information about the covariance structure of the available forecasts. The mean and scale corrected simple average approach yield smaller mean squared forecast error than the three widely used regression approaches suggested by Granger and Ramanathan [11].     

一种使用分量组合的彩色图像压缩方法

为了适应图像的存储和传输,需要对图像进行压缩以减少数据量。对于彩色图像而言,其色彩模式和数据组合直接影响了压缩效率,压缩时通常采用每个分量单独压缩后再统一编码,未考虑分量之间的组合关系。根据彩色图像的数据结构将图像的RGB分量排列组合成新的灰度图像,将其中一个分量作为基准实行粗细分层操作,汇同该分量与其他两个分量的差值图像分别按JPEG压缩标准进行压缩编码。实验表明,该算法得到的压缩图像在与JPEG同等质量的条件下,数据量要小于JPEG压缩的数据量,耗时短,同时可为快速的彩色图像搜索和预览提供技术参考。     

基于联合滤波算法的复杂时变系统在线自适应逆控制

针对一类结构和参数均具备时变特性的复杂时变系统,提出一种新的基于联合滤波算法的在线自适应逆控制方法.该方法在处理参数时变问题的同时可兼顾系统的结构时变特性,实现复杂动态系统的在线跟踪控制.同时提出新的联合Volterra核函数滤波算法,该算法克服了原Volterra滤波器计算复杂运算速度慢的缺点,实现了动态非线性系统的在线跟踪控制.通过仿真分析可以得出,对于此类线性、非线性复杂时变系统,基于新的联合滤波器的自适应逆控制方法可以快速有效的实现动态对象在线建模与控制.     

Three-objective fuzzy chance-constrained programming model for multiproject and multi-item investment combination

This paper presents a new fuzzy chance-constrained programming model to find the solution for multiproject and multi-item investment combination in investment combination problems. The proposed 0-1 integer programming model has three objectives with fuzzy constraints, and NSGA-II is applied to solve the optimization model with a small modification of the constraint-handling rule. A simulation experiment illustrating the application of the proposed model is presented and Pareto-optimal solutions are obtained through a modified NSGA-II algorithm. A comparison among NSGA-II, PSO, and DE shows that modified NSGA-II has some advantages over PSO and DE.     

Off-line recognition of realistic Chinese handwriting using segmentation-free strategy

Great challenges are faced in the off-line recognition of realistic Chinese handwriting. This paper presents a segmentation-free strategy based on Hidden Markov Model (HMM) to handle this problem, where character segmentation stage is avoided prior to recognition. Handwritten textlines are first converted to observation sequence by sliding windows. Then embedded Baum-Welch algorithm is adopted to train character HMMs. Finally, best character string maximizing the a posteriori is located through Viterbi algorithm. Experiments are conducted on the HIT-MW database written by more than 780 writers. The results show the feasibility of such systems and reveal apparent complementary capacities between the segmentation-free systems and the segmentation-based ones.