知识线索树——智能教学系统中知识关系的表示方法

知识关系模型是智能化教学系统开发过程中必须面临的问题,也是系统实际运用时教师们必须理解的概念.＂知识线索树＂模型,是在现有知识模型——树状、网状模型基础上,结合实际教与学的需求与现代教育理论提出的一种新的知识关系表示模型.该文系统阐述了知识线索树的理论基础、表示原则、表示方法和模型的应用.     

C4.5算法在就业信息中的应用

决策树是进行分类分析的一个常用工具,该文主要讨论C4.5算法在毕业生就业信息中的应用。     

论怀特小说《人树》的时间意蕴

《人树》是澳大利亚作家帕特里克.怀特的一部力作。《人树》以斯坦的一生为线索,在历史时间和生存时间的基础上,于小说叙事之中融进对生命的哲性思考,揭示“断裂”和“死亡”等概念的哲理内涵,探索人生的意义。人物斯坦正是叙述者所聚焦的一个思考主体,一个充实哲理内涵的孤独英雄。     

树形图在英语句子结构分析中的应用

利用树形图来分析英语句子结构是一种比较新颖的分析方法。它是句法学中分析句子结构的方法之一。通过树形图的说明,除了句子结构成分之间的文法关系得以清楚呈现之外。模棱两可的句子结构也可得到更好的解析。     

A Comparative Study of Water Imagery in the Chinese Poem Happy Rain on a Spring Night and American Poem A Drop Fell on the Apple Tree

This essay directs at the water imagery of two poems Happy Rain on a Spring Night and A Drop Fell on the Apple Tree.Although living in different time and place, Chinese poet Du Fu and American poetess Emily Dickinson share some deep understanding of the water. This secret of water imagery is unveiled in this essay with the help of Archetypal Criticism, revealing its significance to the human beings as a race.     

基于树模型回归算法在预测问题中的研究

首先介绍基于树模型的两种回归算法,通过在Weka平台上实验所得数据,对该模型下的这两种算法的预测性能给予评估。     

Trees as natural barriers against heavy metal pollution and their role in the protection of cultural heritage

Leaves of common deciduous trees: the horse chestnut (Aesculus hippocastanum) and linden (Tilia spp.) from the park, near one of the most important cultural institutions, the National Library of Serbia, were studied as bioaccumulators of heavy metal (Cr, Fe, Ni, Zn, Pb, Cu, V, As and Cd) air pollution. The leaf samples were collected from the urban park exposed to the exhaust of heavy traffic. The May–September heavy metal accumulation in the leaves, and their temporal trends, were assayed in a multi-year period (2002–2006). Comparing the obtained concentration of the investigated elements from the beginning to the end of growing seasons, a significant rate of accumulation was determined for a majority of measured elements, and it was concluded that these tree species (horse chestnut and linden) can be used as bioaccumulators of the investigated heavy metals. The SEM-EDAX analysis of individual particles deposited on the leaves showed that the 50–60% belong to a class of fine particles (D < 2 μm), mainly of anthropogenic origin. Thus, the investigated tree species could be grown as a natural barrier against urban air pollution in the vicinity of libraries, museums and other buildings for cultural heritage storage.     

改进ID3算法在管道腐蚀检测系统中的应用研究

ID3算法计算速度较快、容易实现并且适用于处理规模较大的学习问题,但其较倾向于选择取值较多的类别,从而导致丢失全局最优解。提出一种改进的ID3算法,并将其应用于管道腐蚀检测系统中,研究结果表明,改进后的算法具有较高的可信度。     

基于分类树和支持向量机的个人信用评估方法

通过对分类树和支持向量机这两种方法在个人信用评估领域的适用性分析,提出了一种将分类树和支持向量机结合起来处理个人信用评估的新方法．用该方法处理含有混合数据的个人信用评估实例,结果表明,该方法有效地提高了整个模型的训练精度和测试精度．     

Flash课件平台组件技术研究

主要介绍了现今教育教学领域使用的主流课件技术,并详细描述了其中一种常见组件——Tree组件的应用方法。以Tree组件产生的效果作为切入点,由浅入深地对该组件及相关技术进行了阐述。