从《Visual Basic程序设计》谈课堂教学改革

从计算机二级等级考试出发,根据《Visual Basic程序设计》课程自身的特点,对《Visual Basic程序设计》的教学方法进行改革。改革的基本原则:课堂上应以学生为本,注重激发学生的学习兴趣,帮助学生体验成功,增强自信。具体做法:不拘泥于课本,从顺序上对教学内容进行大胆地调整,将教学内容进行有机分解、组合,应用案例教学法。     

Leveraging online communities in fostering adaptive schools

There has long been a call for schools to prepare students for the twenty-first century where skills and dispositions differ significantly from much of what has historically characterized formal education. The knowledge based economy calls for policy and pedagogical efforts that would transform schools. Schools are to foster communities of learners. This paper suggests that para-communities may be points of leverage in the fostering of adaptive schools. A critical analysis is done on the differences between para-communities (such as online communities) and schools; and an argument is made that they each serve differing goals and should be left distinct because they achieve different societal and economic demands.     

Robust Estimation of GARMA Model Parameters with an Application to Cointegration among Interest Rates of Industrialized Countries

We review the literature on long memory ARFIMA and GARMA models andintroduce a new efficient estimator for GARMA models, which we show to berobust. Next we conduct a Monte Carlo study to demonstate the power of theDickie–Fuller test when the data are generated from a stationary GARMAprocess. We conclude with a brief discussion of cointegration in the contextof GARMA models with an application to international interest rates.     

Spatial interest pixels (SIPs): useful low-level features of visual media data

Visual media data such as an image is the raw data representation for many important applications. Reducing the dimensionality of raw visual media data is desirable since high dimensionality degrades not only the effectiveness but also the efficiency of visual recognition algorithms. We present a comparative study on spatial interest pixels (SIPs), including eight-way (a novel SIP detector), Harris, and Lucas‐Kanade, whose extraction is considered as an important step in reducing the dimensionality of visual media data. With extensive case studies, we have shown the usefulness of SIPs as low-level features of visual media data. A class-preserving dimension reduction algorithm (using GSVD) is applied to further reduce the dimension of feature vectors based on SIPs. The experiments showed its superiority over PCA.

Texture analysis of poly-adenylated mRNA staining following global brain ischemia and reperfusion

Texture analysis provides a means to quantify complex changes in microscope images. We previously showed that cytoplasmic poly-adenylated mRNAs form mRNA granules in post-ischemic neurons and that these granules correlated with protein synthesis inhibition and hence cell death. Here we utilized the texture analysis software MaZda to quantify mRNA granules in photomicrographs of the pyramidal cell layer of rat hippocampal region CA3 around 1 h of reperfusion after 10 min of normothermic global cerebral ischemia. At 1 h reperfusion, we observed variations in the texture of mRNA granules amongst samples that were readily quantified by texture analysis. Individual sample variation was consistent with the interpretation that animal-to-animal variations in mRNA granules reflected the time-course of mRNA granule formation. We also used texture analysis to quantify the effect of cycloheximide, given either before or after brain ischemia, on mRNA granules. If administered before ischemia, cycloheximide inhibited mRNA granule formation, but if administered after ischemia did not prevent mRNA granulation, indicating mRNA granule formation is dependent on dissociation of polysomes. We conclude that texture analysis is an effective means for quantifying the complex morphological changes induced in neurons by brain ischemia and reperfusion.     

适用无线传输的图像ROI提取及优先编码研究

本文采用模板匹配及区域生长相结合的方法提取图像感兴趣区域,所采用的模板是由彩色图像角点构成的特征多边形内角组合而成;采用最大位移法对感兴趣区域进行优先编码.实验结果表明,这种方法能够有效地提取图像感兴趣区域,而且图像感兴趣区域优先编码效果好.     

利率随机时的跳跃扩散过程的期权定价模型

假定股票价格的跳过程为一般的计数过程,建立了股票价格服从跳扩散过程的行为模型。运用随机分析中的鞅方法,讨论了当利率为随机变量时的期权定价问题,推导出了利率随机时欧式买权与卖权的定价公式以及平价关系,推广了已有的结果。     

高职学生“高等数学”学习的非智力问题的探讨

非智力问题对现阶段高职学生高等数学学习效果的影响十分突出。从学习动机、兴趣、习惯等非智力因素方面分析了高职学生高等数学学习效果差的原因,提出激发学生学习动机、培养学生学习兴趣、改变学生不良学习习惯等措施,以期改变高等数学“教师难教、学生难学”的局面。     

大跨悬索桥索梁锚固区疲劳养护概率优化方法

合理的桥梁养护规划应在养护费用与失效风险之间找到一个合理的平衡.将养护费用分为检测费用,维修费用与失效费用,将线弹性断裂力学、结构可靠度理论、全寿命成本分析法结合起来,提出了基于全寿命周期成本的焊接构件疲劳养护概率优化的方法.考虑了检测概率、养护决策者的维修意愿、维修措施概率和失效概率等多种因素,把桥梁养护优化问题变为在焊接结构或构件满足在生命周期内最小允许可靠度的基础下,养护总费用最小的问题,并提出了简化计算方法.以青草背长江大桥索梁锚固区的关键疲劳细节养护为例,研究了主要参数对最优检测时刻的影响,研究结果表明,考虑了失效成本后,最优疲劳养护时刻提前,折现率对养护费用影响明显.当车辆荷载逐年增加时,索梁锚固区在设计基准期内疲劳破坏风险增大,应引起足够的重视.     

当代艺术设计中的人性化探究

人性化设计是当代设计发展的必然趋势和最终归宿。人性化设计主要是抓住人的特性,不断满足人性的需求而不断创新设计出更加便利、舒适、节能的产品。基此,文章认为宜着重考虑“满足人们趣味性和娱乐性的需求;满足使用者情感上的需求;满足人体结构舒适度的需求;满足不同类型使用者的需求;呼应节能减排及低碳的生活方式”这几个方面,以体现当代艺术设计的人性化。