珠三角“代耕农”的流动路线与分布区域     

向安强  林乾森  黄超  赖韦文 《科学与管理》2014,(6):26-30

“代耕农”作为特殊农民群体,在珠三角劳作生活30多年,对当地经济社会发展具有历史贡献。他们来自他乡,异地务农,漂泊游移,居无定所,属于社会底层的弱势群体,其流动路践与分布规律值得关注。“代耕农”主要分布在深圳、中山、珠海、佛山、东莞和惠州等地区。但其分布区域正在发生变化,珠三角边缘地区的“代耕农”群体在不断壮大,从经济发达城市退至经济较为落后城市,是近年来“代耕农”群体迁移的趋向。  相似文献   

Lexical and Syntactic knowledge for Information Retrieval     

Antonio Ferrández 《Information processing & management》2011

Traditional Information Retrieval (IR) models assume that the index terms of queries and documents are statistically independent of each other, which is intuitively wrong. This paper proposes the incorporation of the lexical and syntactic knowledge generated by a POS-tagger and a syntactic Chunker into traditional IR similarity measures for including this dependency information between terms. Our proposal is based on theories of discourse structure by means of the segmentation of documents and queries into sentences and entities. Therefore, we measure dependencies between entities instead of between terms. Moreover, we handle discourse references for each entity. It has been evaluated on Spanish and English corpora as well as on Question Answering tasks obtaining significant increases.  相似文献   

Linguistic kernels for answer re-ranking in question answering systems     

Alessandro Moschitti  Silvia Quarteroni 《Information processing & management》2011

Answer selection is the most complex phase of a question answering (QA) system. To solve this task, typical approaches use unsupervised methods such as computing the similarity between query and answer, optionally exploiting advanced syntactic, semantic or logic representations.  相似文献   

A structural support vector method for extracting contexts and answers of questions from online forums     

Yunbo Cao  Wen-Yun Yang  Chin-Yew Lin  Yong Yu 《Information processing & management》2011

This article addresses the issue of extracting contexts and answers of questions from posts of online discussion forums. In previous work, general-purpose graphical models have been employed without any customization to this specific extraction problem. Instead, in this article, we propose a unified approach to context and answer extraction by customizing the structural support vector machine method. The customization enables our proposal to explore various relations among sentences of posts and complex structures of threads. We design new inference algorithms to find or approximate the most violated constraint by utilizing the specific structure of forum threads, which enables us to efficiently find the global optimum of the customized optimizing problem. We also optimize practical performance measures by varying loss functions. Experimental results show that our methods are both promising and flexible.  相似文献   

Knowledge and reasoning for question answering: Research perspectives     

Patrick Saint-Dizier  Marie-Francine Moens 《Information processing & management》2011

This paper presents a roadmap of current promising research tracks in question answering with a focus on knowledge acquisition and reasoning. We show that many current techniques developed in the frame of text mining and natural language processing are ready to be integrated in question answering search systems. Their integration opens new avenues of research for factual answer finding and for advanced question answering. Advanced question answering refers to a situation where an understanding of the meaning of the question and the information source together with techniques for answer fusion and generation are needed.  相似文献   

基于常用问题集的问答系统设计与实现     

张梅  段建勇 《现代图书情报技术》2011,(9):83-87

针对图书出版领域的常用问题集研制自动问答系统,重点解决问句索引与检索问题。在问句索引中提出结合分词与词性标注、浅层语义分析等方法来索引问句;在问句检索中提出基于特征向量空间和语义类的方法来计算问句相似度。最后对该系统进行实现。  相似文献   

农户管理水平下微咸水灌溉对土壤水盐动态及作物产量的影响   总被引：1，自引：0，他引：1  

马文军  宇振荣 《资源科学》2013,35(3):585-593

微咸水灌溉对土壤水盐动态及作物产量的影响因管理水平而异,实验站与农户管理水平间的比较研究有助于揭示专家与农户间的知识差,促进合理灌溉措施的推广.该文基于农户田间试验和农户调查,分析了农户管理水平下微咸水灌溉对土壤水盐动态及作物产量的影响;对比实验站研究结果,讨论了实验站和农户管理水平下微咸水灌溉影响的差异.结果表明:农户管理水平下,微咸水灌溉可能主要影响0～80cm土层的土壤饱和电导率;土壤盐分向下淋洗是盐分运动的主要趋势,很难形成上行运动造成土壤次生盐渍化;相对于淡水灌溉,微咸水灌溉的冬小麦相对产量为45.38％～83.33％,夏玉米相对产量为42.86％～58.57％;无论是实验站还是农户管理水平,微咸水灌溉均对土壤饱和电导率产生显著影响,实验站管理水平下的灌溉制度比农户管理水平下的更加合理,农户管理水平下微咸水灌溉对作物产量的影响比实验站管理水平要严重;需要多角度采取措施提高农户管理水平.  相似文献   

赣榆县农民参加体育锻炼的现状研究     

李庆贺  丁先琼 《吉林体育学院学报》2006,22(3):117-118

运用问卷调查、统计分析和专家访谈等方法，对赣榆县农民参加体育锻炼的现状进行调查与分析，结果发现赣榆县农民能够根据自己的地方特色参与体育锻炼，农村体育在一定程度上取得了很大成就，但也存在一些问题，提出加强农村、农民体育的指导与舆论宣传的建议，为国家和体育行政部门在农民体育的研究对策方面提供参考。  相似文献   

迷失的市场自由叙事     

徐肖楠 《珠海城市职业技术学院学报》2006,12(3):83-89

21世纪中国文学叙事进入了市场自由叙事，就进入了整一性现实意识控制，它们忽略了诗性、人性和历史叙事的更大可能。具有小农气息的市场化生存意识深刻地影响着文学叙事，狭窄意义上的现实控制着文学叙事正不断失去真诚和真实，我们制造出平庸化、日常化、个人化、身体化等来迷失自己。从21世纪中国文学叙事内外的历史与想象、人性与审美立场同时去观看它，与现实构成单方面一致的市场自由叙事就不具有唯一性。  相似文献   

"问题"在物理学习中的作用     

齐东平 《六盘水师范高等专科学校学报》2003,15(4):85-86

贯彻物理新课程理念,在学科教学中注重科学探究,提高“问题”在物理教学中的作用。  相似文献