Using genetic algorithms to evolve a population of topical queries   总被引：1，自引：1，他引：0  

Rocío L. Cecchini  Carlos M. Lorenzetti  Ana G. Maguitman  Nlida Beatríz Brignole 《Information processing & management》2008,44(6):1863

Systems for searching the Web based on thematic contexts can be built on top of a conventional search engine and benefit from the huge amount of content as well as from the functionality available through the search engine interface. The quality of the material collected by such systems is highly dependant on the vocabulary used to generate the search queries. In this scenario, selecting good query terms can be seen as an optimization problem where the objective function to be optimized is based on the effectiveness of a query to retrieve relevant material. Some characteristics of this optimization problem are: (1) the high-dimensionality of the search space, where candidate solutions are queries and each term corresponds to a different dimension, (2) the existence of acceptable suboptimal solutions, (3) the possibility of finding multiple solutions, and in many cases (4) the quest for novelty. This article describes optimization techniques based on Genetic Algorithms to evolve “good query terms” in the context of a given topic. The proposed techniques place emphasis on searching for novel material that is related to the search context. We discuss the use of a mutation pool to allow the generation of queries with new terms, study the effect of different mutation rates on the exploration of query-space, and discuss the use of a especially developed fitness function that favors the construction of queries containing novel but related terms.  相似文献   

科技英语的文体特征   总被引：1，自引：0，他引：1  

何小阳 《零陵学院学报》2004,(4)

科技英语作为一种功能语体是在普通英语的基础上发展起来的。因而无论在词汇方面,还是在语法方面,它同基础英语没有绝对的界限。但是在语言发展的长期过程中,其独特的活动形式使之在语言方面形成了许多其他语言变体所没有的特点。采用现代文体学理论,从字位、词汇、句法/语法、语境四个层面对科技英语的文体特征进行分析,定会对科技英语的阅读理解,写作与翻译提供某些启示,对进一步推广和发展科技英语具有十分重大的意义。  相似文献   

DOI：搭建中文与外文资源的桥梁     

赵蕴华  姚长青 《数字图书馆论坛》2008,(6):59-62

数字资源网络化以后,中文与外文资源互链共享存在一系列问题：资源文字表述方式上的差异,资源链接的产权保护,信息孤岛的存在,资源编码标准的多样化等。针对这些问题,文章提出利用基于DOI的开放式知识链接体系来搭建中文与外文资源互链的桥梁,并在精品科技期刊平台建设中,利用DOI进行中文与外文链接的实验研究,结果表明该方法有效可行。  相似文献   

面向关联数据的实体链接发现方法研究     

高劲松  周习曼  梁艳琪 《中国图书馆学报》2016,42(6):85-101

随着关联数据应用的不断深入,已有众多的数据集发布在网上,但目前已发布的关联数据集之间关联很少,为数据的共享使用带来不便。本研究提出一种基于统计学习方法进行关联数据集间实体识别及链接构建的方法。首先进行数据集间的实体匹配,采用基于K中心点聚类算法实现属性的聚合及关系发现,对具有高相关度的属性进行匹配关系描述,降低实体匹配时的属性匹配计算次数;其次对已匹配的属性进行实体属性值的相似度比较计算,实现实体间相似度的比较,在SILK框架下实现实体的链接构建工作,以达到实体链接发现的目的;最后通过实验验证,这一方法能降低数据集间实体匹配计算次数,提高实体链接的正确率,具有可行性及实用性。图12。表4。参考文献19。  相似文献   

关联理论解读托福(TOEFL)听力对话     

GUO Hongyu 《中国考试》2008,(6)

20世纪80～90年代,法国认知心理学家Dan Sperber和英国伦敦大学著名语用学家Deirdre Wil- son提出了关联理论,这是建立在格赖斯(Grice)会话含义理论上的用于话语解释的理论。把会话含义理论发展为一个具体的心理—认知模式,为研究人类交际开辟了新的途径。本文从分析TOELF听力对话部分的出题特点和题目内在关联性出发,以关联理论为理论基础,围绕该理论的主要组成部分"语境假设"、"推理"和"最佳关联原则"三个方面阐述该理论在TOELF听力对话中的体现,重点讨论关联理论在TOELF听力对话部分题目设计中的运用特点以及如何巧妙运用关联理论进行题目分析的答题技巧。从而对关联理论在听力教学中的教与学提出启示。  相似文献   

领导学视野下网络情境中教师行为分类研究     

李雪莲  车彩静 《现代教育技术》2008,18(1):36-39

该文首先介绍了领导学研究的主要观点,继而阐释了领导学理论对教学情境中教师行为研究的启示,在此基础上对网络情境下教师行为进行了分类研究,并对影响教师行为选择的学习任务结构、权力影响力和学习共同体等环境权变因素以及控制点、经验等学习者权变因素进行了分析。  相似文献   

网络学习情境创设   总被引：1，自引：0，他引：1  

邹建梅  丁晓光 《山东电大学报》2008,(4):14-15

对于网络学习者来说,网络学习环境直接影响学习的效率和效果,而情境是网络学习环境中的重要元素之一。网络学习环境中蕴含了哪些学习情境,又如何创设这些学习情境成为一个值得探讨的问题。  相似文献   

Top Manager and Institutional Effects on the Adoption of Innovations: The Case of Teleworking 1     

《普罗米修斯》2012,30(1):58-73

In spite of the advances in information and communication technologies, the implementation of teleworking is still behind early expectations. The slow adoption of teleworking may be explained by different organizational drivers that influence its implementation. This article reports the empirical findings of a survey conducted among a sample of Spanish companies to identify potential drivers and constraints based on top manager and institutional perspectives. The results indicate that the potential of teleworking is influenced by the manager's perception of teleworking benefits and barriers, the manager's tenure, the company's use of information and communication technologies, the company's degree of innovation, the proportion of salespeople, women and middle-age employees in the workforce, and the company size. Top manager factors seem to have more influence in the decision to adopt teleworking, while institutional factors are more significant in the potential diffusion in the company.  相似文献   

An ecological approach to psychological adjustment: A field survey among refugees in Germany     

《Int J Intercult Relat》2019

The situation of refugees in Germany and other countries is a current and important matter. The present study adopts an ecological approach to investigate how refugees perceive the welcoming climate in Germany and the consequences of this perception. To further explore the refugees’ situation, we examined several predictors of their psychological adjustment and acculturation attitudes. In a field study in Eastern Germany with N= 94 refugees as participants, we assessed the perceived context of reception, and perceived acculturation attitudes as contextual variables, discrimination and contact as intergroup variables and, on the individual level, psychological adjustment as well as the personal acculturation attitudes as dependent variables. The results revealed that more perceived discrimination resulted in an increase in reported psychological problems. Refugees living in asylum centers reported more psychological problems and more perceived discrimination than those living in independent housing. The perceived context of reception positively predicted refugees’ desire for maintenance of intergroup relations with the host society. Positive intergroup contact lowered their desire for cultural maintenance. In sum, this study gives us rare and valuable insight into refugees’ perspectives in the context of recent immigration to Germany. In doing so, it emphasizes the importance of a welcoming climate. The study shows how meaningful the assessment of the perceived context of reception is. Practical implications for fields such as the accommodation of refugees are discussed.  相似文献   

《菜根谭》中元话语对语境的构建功能     

计艳  蔡希望 《广播电视大学学报》2010,(3):110-113

元话语实现了语言交际中的人际及语篇功能,有助于显示无意识的语言选择和社会语境的关系。分析明人洪应明的《菜根谭》来阐述元话语对特定语境的构建和体现功能,说明元话语在交际过程中传递着与交际情景有关的语用信息,在特定语境中对于表达发话者的话语意图,顺利地完成交际任务发挥着重要作用。  相似文献