Exploring coherent topics by topic modeling with term weighting

Topic models often produce unexplainable topics that are filled with noisy words. The reason is that words in topic modeling have equal weights. High frequency words dominate the top topic word lists, but most of them are meaningless words, e.g., domain-specific stopwords. To address this issue, in this paper we aim to investigate how to weight words, and then develop a straightforward but effective term weighting scheme, namely entropy weighting (EW). The proposed EW scheme is based on conditional entropy measured by word co-occurrences. Compared with existing term weighting schemes, the highlight of EW is that it can automatically reward informative words. For more robust word weight, we further suggest a combination form of EW (CEW) with two existing weighting schemes. Basically, our CEW assigns meaningless words lower weights and informative words higher weights, leading to more coherent topics during topic modeling inference. We apply CEW to Dirichlet multinomial mixture and latent Dirichlet allocation, and evaluate it by topic quality, document clustering and classification tasks on 8 real world data sets. Experimental results show that weighting words can effectively improve the topic modeling performance over both short texts and normal long texts. More importantly, the proposed CEW significantly outperforms the existing term weighting schemes, since it further considers which words are informative.     

大学音乐专业学生论文选题若干问题的探索

选题,是撰写论文的起步阶段,针对大学音乐专业学生的论文选题中雷同及片面的问题,从选题的途径和方式两个方面进行了探索。     

混合多层分类和朴素贝叶斯模型的垂直搜索引擎分类器设计

研究Web上计算机教育资源的分布特点,融合主题词和文档形式,设计多层分类器来完成主题搜索过程中的正确分类,继而应用朴素贝叶斯模型对主题资源信息进行自动类别划分,完成资源的物理存储。实验中主题分类的平均正确率约78%,主题的平均召回率约61%,而资源解析的平均正确率约81.5%,测试结果能够验证本文设计思想的可行性。     

图书全程策划的实务与技巧

图书运作的全过程中,策划编辑扮演着总设计师的角色;在这个过程的各个阶段,策划编辑扮演的角色各不相同。本文分选题策划、组稿、审稿和加工、书名和辅文设计、装帧设计、推广与营销几个阶段,阐述如何对一本书进行全程策划。     

新课标观照下的中考语文试题特点分析

自新课改实施以来,各地中考语文试题,尽管在题型设置、选材风格、制卷样式上存在差异,但在诸多理论和实践问题上存在共性,都能运用新课标、新理论、新思路、新技巧于测试中,以读写为轴心自然展开,更加关注对学生语文素养的考查,体现出贴近生活、题型开放、偏重主观表达的特点。     

从澳大利亚外语教学模式浅谈我国大学英语教学

澳大利亚外语教学主要有四种模式,即实景教学模式、主题教学模式、课堂互动教学模式和研究式学习模式。针对目前我国大学英语教学中存在的一些问题,借鉴澳大利亚的外语教学模式改革我国大学英语教学有重要的意义。     

Schema and constraints-based matching and merging of Topic Maps

In this paper, we propose a multi-strategic matching and merging approach to find correspondences between ontologies based on the syntactic or semantic characteristics and constraints of the Topic Maps. Our multi-strategic matching approach consists of a linguistic module and a Topic Map constraints-based module. A linguistic module computes similarities between concepts using morphological analysis, string normalization and tokenization and language-dependent heuristics. A Topic Map constraints-based module takes advantage of several Topic Maps-dependent techniques such as a topic property-based matching, a hierarchy-based matching, and an association-based matching. This is a composite matching procedure and need not generate a cross-pair of all topics from the ontologies because unmatched pairs of topics can be removed by characteristics and constraints of the Topic Maps. Merging between Topic Maps follows the matching operations. We set up the MERGE function to integrate two Topic Maps into a new Topic Map, which satisfies such merge requirements as entity preservation, property preservation, relation preservation, and conflict resolution. For our experiments, we used oriental philosophy ontologies, western philosophy ontologies, Yahoo western philosophy dictionary, and Wikipedia philosophy ontology as input ontologies. Our experiments show that the automatically generated matching results conform to the outputs generated manually by domain experts and can be of great benefit to the following merging operations.     

探究议题式教学在高中政治课堂中的运用

随着当前社会和经济的发展,有关部门针对高中教学模式及教学理念提出了相关的调整措施。高中政治作为学生的必修科目,其枯燥的政治理论和政治思想让学生难以接受,但如果教师能够适当地调整教学模式,学生就够很好地转变学习思维。本文通过传统教学模式的叙述和议题式教学的创新对比,进一步推出高中政治课堂上应用议题式教学的理论方法。     

数学命题教学研究:数学教育研究"绕不开的广阔领地"

在对作为教学内容的数学命题的内涵与外延界定与作用分析的基础上,提出了数学命题教学研究是数学教育研究的核心,并介绍了一些与数学命题教学研究有关的课题。     

与话题相关的介词“对”的隐现

本文主要讨论现代汉语介词“对”的隐现问题。研究表明：“对”的省略必须满足三个条件,即句法上,“对”字结构位于句首作状语;语义上,在“对”介引的成分与动词或动词宾语有隐性语义关系前提下,如果“对”后边的名词性成分中包含指示代词或疑问代词,“对”可以隐藏,如果该名词性成分是降格的受事论元,“对”也可以隐藏;音节上,“时”介引的必须是非单音节词。