基于二维混合模型的鲁棒迭代学习控制设计

针对一类正则线性不确定系统,提出一种基于连续/离散二维混合模型的迭代学习控制设计方法。首先,通过独立地考虑迭代学习控制系统连续的控制行为与离散的学习行为,建立迭代学习控制系统的连续/离散二维混合模型,将迭代学习控制器设计问题转化为一类连续/离散二维系统的状态反馈控制问题。然后应用二维连续/离散系统方法,获得迭代学习控制系统稳定性条件。最后根据稳定性条件,利用线性矩阵不等式方法,求得迭代学习控制器参数,它通过Matlab工具箱可以方便的获得。与现有方法相比,所提出的迭代学习控制器利用了输出误差以及状态变化的信息来修正当前的控制,因而设计方法更加符合其本质特征,具有简单实用、直观明了的特点。数值仿真实例验证了所提方法的有效性。     

信息技术课程教学中基于网络学习的试验与思考

基于网络的学习是克服现有信息技术教学中存在弊端的有效方法之一 ,本文介绍了试验的过程和调查结果 ,并提出了今后改革的方向 .     

课程道德学习的课外体验教育

学校道德教育的作用在于发现、鼓励、促进学生的道德学习。课程道德学习的课内与课外不仅缺一不可,而且需要深度整合,课内和课外必须有机地融合起来。德性的养成既要由外而内,也要由内而外;既是内外互化的开放式过程,又是体验、移情、理解、对话和反思诸环节相统一的过程。注重道德体验教育,寻找课外体验路径,纵向贯穿教学的全过程,横向融合统一在教学活动之中,将内外互化诸环节融合起来,是增强道德学习有效性的重要途径。     

Spatial and temporal variations of zooplankton composition and quantity distribution in the upper waters around Nansha Islands

This study aims to examine spatial and temporal variations of zooplankton species composition, density and biomass distribution and community structure, based on the data obtained from three separate cruises carded out in November 1997, April and July 1999. Results show that 244 species of zooplankton and 8 groups of planktonic larvae were identified, which were dominated by copepods, followed by amphipods, ostracods and medusae. The total species were 201 and 198 for the cruises of November 1997 and July 1999, respectively, and no obvious seasonal variation of species richness was observed. The distribution of zooplankton species richness decreased from pelagic to coastal waters. Average richness of species in each station was higher in the cruises of November 1997（62） and April 1999（61） than in the cruise in July 1999 （56）, which was mainly a result from the pelagic or coastal water mass movement made by the monsoon. Zooplankton in the upper waters （0--100 m） around Nansha Islands belonged to the typical tropic pelagic fauna, most of them were pelagic warm-water species, followed by coastal warm-water species and euryhaline warm-water species. The number of dominant species ranged from 5 to 7 in each cruise. No obvious seasonal succession of dominant species was ob- served. Sagitta enflata, Cypridina narni, Cosmocalanus darwinii, Pleuromamma gracilis and Echino-pluteus larva were the main dominant species. The average of zooplankton biomass and density in three cruises were 31, 32, 28 mg·m^-3 and 31, 39, 35 ind·m^-3, respectively. Copepods were the most abundant, followed by chaetognaths. Zooplankton high biomass distributed mainly in the northwestern waters around Nansha Islands, and generally occurred in the areas of oceanic front and upweUing. The main reason for zooplankton quantity without obvious seasonal variation was the relative steady temperature dynamics in the waters around Nansha Islands.     

论英语自学能力的养成

培养大学生自学英语能力需要特定的条件、环境和一些具体的措施,从调动学生主动学习并掌握有效的学习策略入手,能使学生科学地获取知识,提高他们的学习效率.     

长沙市社区体育设施现状与对策

以长沙市为个案，在研究有关概念的基础上，对现代城市社区体育设施现状进行了调查分析，指出社区体育设施的不足，并提出了适应当前社会发展的具有中国特色的城市社区体育设施的发展思路与对策。     

略谈高等学校教学管理工作的"三化"建设

我国高校提高教学质量的重要措施之一是强化教学管理。而规范化、制度化、现代化是实施高校教学管理的必由之路。文章结合泰山学院近年来在教学管理上加强“三化”建设的实践。对“三化”建设的有关问题进行了阐述。     

昆明地区窄叶青冈萌生群落生物量的研究

本文用收获法和维量分析法相结合对窄叶青冈萌生群落地上部分生物量的研究，结果如下：总平均生物量２１．９７吨／公顷。其层次分布规律是：第Ｉ层即窄叶青冈形成的层的生物量为１４．６５吨／公顷，占绝对优势，第ＩＩ层小灌木的生物量为４．５吨／公顷，占的比例较小，而草本层生物量仅为０．５吨／公顷，所占比例极小，甚至可以忽略不计：径级分布规律是：径级小的萌枝数量较多，但生物量较小，径极大的萌枝数量较少但生物量较大     

小学2～4年级学生乘法等值问题认知策略实验研究

乘法等值问题认知策略随被试年龄增长呈显著变化，且正误兼具的多重认知策略的共时激活及使用，可作为判定等值概念获得的学习的过渡状态的指标。我国小学２年级学生处于乘法等值概念获得的过渡状态。     

Fuzzy Entropy Based Combined Learning Algorithm for Neural Networks

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