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.     

一种新的保留语义的P2P系统索引构造方法

提出了一种新的P2P系统索引构建方法.它使用多个简单本体(ontology),对同一资源进行描述,将各个ontology描述转化为相应的本体序号(ontology ID),然后使用Hilbert空间填充曲线,实现从多维ontology ID到一维索引值的映射,得到保留了语义的索引值.根据这个索引值,在Chord等结构化P2P上发布和查找资源.该方法对资源的描述更加准确、简单,资源的发布和查询也更加灵活和高效.     

从“A像B一样C”式比喻的语义搭配看比喻的构成

在“A像B一样C”式比喻性短语作状语的句子中，C与A、B之间的语义搭配呈现出纷繁复杂的情况。C与A、B之间既可以都构成正常搭配，也可以只与其中一个构成正常搭配，而与另外一个形成超常规搭配。与此相对应，比喻句中本体、喻体的构成也并不完全一致。本文运用认知语言学及转换生成语言理论，结合比喻句中的语义搭配来分析比喻中本体的位置及比喻的不同作用。在划分比喻本体和喻体时，要注意其形象的完整性，要和全句的语义搭配关系、语法结构关系结合起来进行分析。划分的方法和标准也应具体句子具体分析，不可一概而论。     

国内外知识抽取系统解析

介绍了目前最流行的知识抽取方法,分析比较了Amilcare、TEXTRUNNER、Pythor、MnM、Text2Onto、SELKAS等知识抽取系统。     

论传统工笔画的审美意境

工笔画在画史中的尴尬处境,实乃文人画语境下的一元论所致。工笔画不等同于画工画,与画工画最大的区别在于画工画只描摹客体而无主体,而工笔画既有客体又有主体,在追求画外意境、诗性的同时,更注重画内的功夫,最求细节与意境、诗性的统一,故传统工笔画的审美,遵循着绘画性、社会性、文学性与精神性原则。     

Semantic-Discovery of Construction Project Files

The dynamics of a construction project generates a huge amount of information for processing. Most project information is recorded in digital files and managed in a decentralized way. Current document management tools do not consider the semantic relationships between files and then cannot discover files based on their content or ensure information consistency across various information repositories. This paper presents a semantic-discovery method for accessing project information across repositories. By adopting semantic web technologies, including extensible markup language (XML), ontology, and logic rules, the semantic-discovery tool can access project files by their properties and relations. The method has been applied to searching for files using documents from a real project. The results show that the semantic content of a file can be used to ensure that only related files are retrieved.     

句子规划器的设计与实现

介绍生成多语种天气预报文本系统中句子规划器的设计与实现．句子规划主要由两部分组成：句子优化和语言资源映射．前者按照一定的优化规则在句子之间消除冗余成分；后者根据具体语言特点对句子进行结构化处理，确定文本结构树并为树中各节点添加语言资源信息，以供表层生成处理时使用．     

Learning activity sequencing in personalized education system

Personalized education provides an open learning environment which enriches the advanced technologies to establish a paradigm shift, active and dynamic teaching and learning patterns. E-learning has a various established approaches to the creation and sequencing of content-based, single learner, and self-paced learning objects. However, there is little understanding of how to create sequences of learning activities which involve groups of learners interacting within a structured set of collaborative environments. In this paper, we present an approach for learning activity sequencing based on ontology and activity graph in personalized education system. Modeling and management of learning activity and learner are depicted, and an algorithm is proposed to realize learning activity sequencing and learner ontology dynamically updating.     

The Oblivion of Churchman's Plea for a Systems Approach to World Problems. I. The Inseparability of Systems Thinking and World Issues in the Modern Epoch

Systemic Practice and Action Research - The presentation of a Systems Approach made by Churchman in 1968 starts from a close link between a systems approach and tackling world problems. The link is...