一种基于改进互信息的文本分类方法

用改进的互信息公式进行特征选择,通过三种文本分类方法验证了改进的公式具有较高的准确率、召回率和F1值,从而证明改进的互信息公式的有效性.     

Scanning for sisnatures of geosraphically restricted selection based on population genomics analysis

Natural selection, as the driving force of human evolution, has direct impact on population differentiation. However, it is still unclear to what extent the genetic differentiation has been caused by natural selection. To explore this question, we performed a genome-wide scan with single nucleotide polymorphism （SNP） data from the International HapMap Project. Single locus FsTanalysis was applied to assess the frequency difference among populations in autosomes. Based on the empirical distribution of FsT, we identified 12669 SNPs correlating to population differentiation and 1853 candidate genes subjected to geographic restricted natural selection. Further interpretation of gene ontogeny revealed 121 categories of biological process with the enrichments of candidate genes. Our results suggest that natural selection may play an important role in human population differentiation. In addition, our analysis provides new clues as well as research methods for our understanding of population differentiation and natural selection.     

Research on Bayesian Network Based User＇s Interest Model

It has very realistic significance for improving the quality of users＇ accessing information to filter and selectively retrieve the large number of information on the Internet. On the basis of analyzing the existing users＇ interest models and some basic questions of users＇ interest （representation, derivation and identification of users＇ interest）, a Bayesian network based users＇ interest model is given. In this model, the users＇ interest reduction algorithm based on Markov Blanket model is used to reduce the interest noise, and then users＇ interested and not interested documents are used to train the Bayesian network. Compared to the simple model, this model has the following advantages like small space requirements, simple reasoning method and high recognition rate. The experiment result shows this model can more appropriately reflect the user＇s interest, and has higher performance and good usability.     

资本经营的类型及其战略选择

实施资本经营战略对于推动国有资产流动和重组,寻求公有制的有效实现形式, 实现经济体制改革的新突破有重要的现实意义.但实施资本经营必须选择资本经营战略的类型,分析实施所具备的条件, 才能解决根本问题.     

浅谈图书馆装饰设计中大型装饰壁画的选择

图书馆室内大型壁画表现了公益性的内涵和雅俗共赏的艺术品位,承载着现代时尚、民族精神及地域风情等文化艺术符号。图书馆壁画的设计选择要体现以人为本的文化理念,壁画的构图、色彩、线条等装饰性因素都要始终贯穿人文性的精神需求。同时,图书馆壁画的选择,还应从题材、材质、材料和审美风格等方面表现出强烈的时代气息。总之,图书馆装饰壁画的设计选择应从人文性、装饰性和时代性3个方面加以考虑。     

金刚石薄膜场致发射的研究

简要分析了 FED场发射显示器的工作原理 ,陈述了非晶金刚石薄膜特殊的优点后 ,对用金刚石薄膜制作场发射器的可行性进行了讨论 ;还介绍了利用金刚石薄膜和阳极选择的方法对Spindt FED作了改进 ,从而使平面 FED更容易实现。     

A New Statistic for Variable Selection in Questionnaire Analysis

1　 IntroductionIn questionnaire analysis,there are two important problems.One is called variableselection or assessment of question worth by which we mean a questionnaire that shouldconsist of those questions which are helpful to distinguish the respondents,in anotherword,a question should be discarded if it doesn′t offer sufficient information fordistinguishing the groups.The other is the problem of discriminant analysis,that is,anew respondent should be properly put into a certain group ba…     

论高校图书馆勤工助学管理有效性选择

勤工助学的兴起和发展是高校图书馆工作的一个趋势。借鉴国外的成功经验,针对高校在实行图书馆勤工助学所存在的问题,提出了当前需要采取的有效对策。     

饭店加入区域联盟的动因、条件与类型决策研究

阐述了饭店加入区域联盟的入盟动因,并分析了饭店入盟所需考虑的内外部加盟条件。以此为基础,分析了饭店选择联盟类型的决策方向,并提出了各种主要联盟类型的决策要素。     

关于干部选拔标准的思考

回顾了干部选拔标准的历史演变，对东方和西方国家干部选拔的标准进行了比较，提出了干部选拔标准的模块设计方案。