Topic discovery based on text mining techniques     

Aurora Pons-Porrata  Rafael Berlanga-Llavori  José Ruiz-Shulcloper 《Information processing & management》2007

In this paper, we present a topic discovery system aimed to reveal the implicit knowledge present in news streams. This knowledge is expressed as a hierarchy of topic/subtopics, where each topic contains the set of documents that are related to it and a summary extracted from these documents. Summaries so built are useful to browse and select topics of interest from the generated hierarchies. Our proposal consists of a new incremental hierarchical clustering algorithm, which combines both partitional and agglomerative approaches, taking the main benefits from them. Finally, a new summarization method based on Testor Theory has been proposed to build the topic summaries. Experimental results in the TDT2 collection demonstrate its usefulness and effectiveness not only as a topic detection system, but also as a classification and summarization tool.  相似文献   

新一代ICP-MS功能及其痕量元素检测新技术     

卢森锴  韦汉龙  韦永森 《桂林师范高等专科学校学报》2011,25(2):144-147

综述了ICP-MS仪器的基本原理、结构、发展应用概况及其新产品的功能特点;阐述了新一代ICP-MS在有色金属材料痕量元素检测分析中质谱干扰和非质谱干扰问题及其克服新技术。  相似文献   

Scientific community detection via bipartite scholar/journal graph co-clustering     

Chiara Carusi  Giuseppe Bianchi 《Journal of Informetrics》2019,13(1):354-386

This paper stems from the observation that researchers in different fields tend to publish in different journals. Such a relationship between researchers and journals is quantitatively exploited to identify scientific community clusters, by casting the community detection problem into a co-clustering problem on bipartite graphs. Such an approach has the potential of leading not only to the fine- grained detection of scholar communities based on the similarity of their research activity, but also to the clustering of scientific journals based on which are the most representative of each community. The proposed methodology is purely data-driven and completely unsupervised, and does not rely on any semantics (e.g. keywords or a-priori subjective categories). Moreover, unlike “flat” data structures (e.g. collaboration graphs or citation graphs) our bipartite graph approach blends in a joint structure both the researcher's attitude and interests (i.e., freedom to select the venue where to publish) as well as the community's recognition (i.e., acceptance of the publication on a target journal); as such may perhaps inspire further scientometric evaluation strategies. Our proposed approach is applied to the Italian research system, for two broad areas (ICT and Microbiology&Genetics), and reveals some questionable aspects and community overlaps in the current Italian scientific sectors classification.  相似文献   

论能力与检测     

张树俊 《安徽职业技术学院学报》2011,10(4):46-49,63

能力检测是人力资源管理的基本环节,每个人的能力都是由能力质与能力量两大要素构成的,所以对于职工能力水平要从质和量两个方面进行检测。同时,由于人的能力体现受活动内容及其环境的影响,所以能力检测必须围绕活动来进行,并考虑环境因素的影响。此外,能力检测的可信度受诸多因素的影响,所以在测量职工的能力时,应灵活选择检测方式,采取定性分析与定量分析相结合的方法,客观公正、实事求是地对人的能力进行整体的、辩证的分析,努力提高能力检测的可信度。  相似文献   

自动内容抽取中的中文事件标注     

张先飞  郭志刚  李弼程  孙显著 《情报学报》2011,30(1)

事件检测与描述(Event Detection and Characterization,EDC)自2005年作为自动内容抽取(Automatic ContentExtraction,ACE)评测的一个重要子任务出现以来,中文事件的标注、检测与描述越来越成为研究热点。本文就自动内容抽取中的中文事件标注进行详细、系统地研究,主要包括:在ACE会议定义中文事件相关概念的基础上,给出事件标注中事件的可标注内容,包括事件范围及事件触发词等;根据生活中的事件分类在人工事件标注中对EDC的事件进行类别划分及其子类的详细区分,以降低事件检测的复杂度;对每个事件类别(包括子类别)中构成事件的元素进行研究,综合事件类别及其元素信息完成中文事件的标注。本文的研究成果在中文文本信息抽取、自动摘要及主题检测与追踪中得到了很好的应用。  相似文献   

Position detection and vibration monitoring system using quad-cell optical beam power distribution     

Yasmine El-Ashi  Taha Landolsi  Rached Dhaouadi 《Journal of The Franklin Institute》2011,348(7):1435-1455

In this paper, we study the accuracy of an optical vibration sensing system using Gaussian beam analysis. The proposed optical system uses a He-Ne laser source whose Gaussian beam impinges on a quad-cell photodetector array. The normalized optical power for each cell is obtained through numerical simulation based on the well-known Gaussian beam optics formulation, as the beam scans the plane of the photodetectors due to vibration. The system detection principle lies upon finding a relationship between the power distribution of the quad-cell and the position of the beam centroid, which allows us to identify the characteristics of the vibration applied, such as direction, frequency and strength. The aspects of practical implementation and experimental limitations on the power distribution accuracy are discussed and the discrepancies with the theoretical results are presented.  相似文献   

基于传送带背景的同色重叠目标的边缘检测     

梁利倩  赵梗明 《中国科技信息》2011,(24):49-50

本文针对现有的生产线上产品质量检验对机器视觉识别技术的需要,为了能够从传送带上采集的图像中提取几何特征。笔者以传送带上葡萄等级检测项目为例,首先用轮廓波变换对含噪声的采集图像消噪,然后再进行图像边缘检测,边缘检测的效果直接影响了是否能从采集的葡萄个体图像中提取出几何特征参数。实验结果表明此方法能够在同色重叠物体图像中获得较准确完整的边缘检测效果,从而使几何特征提取成为可能。  相似文献   

文本内容新颖性探测研究综述   总被引：2，自引：0，他引：2  

邢美凤  过仕明 《情报科学》2011,(7)

如何为用户提供及时有用的新颖信息是一个亟待解决的研究内容。试图对文本内容新颖性探测的研究方法做一个梳理,从文本内容新颖性探测的研究起源、应用于这一研究的文本表示方法、相似性对比的方法以及内容新颖性探测过程等方面进行分析,以期对文本内容新颖性探测的研究有一个较全面的把握。  相似文献   

基于改进的K-means算法的异常检测     

苏巴提  张晓 《人天科学研究》2011,(11):76-78

聚类算法通常用于数据的聚类。除此,它还可以用于异常数据的检测。首先介绍了基于划分的聚类算法K-means,然后给出改进算法I-K-means的算法描述,最后通过实例进行异常分析。  相似文献   

基于文本内容的科学前沿探测方法研究进展     

华旦草  安培浚  肖仙桃 《现代情报》2021,41(1):169-177

[目的/意义] 本文从科学前沿概念出发,对当前已有的基于文本内容的科学前沿探测方法进行梳理总结,为科学前沿探测方法的发展提供基本参考和启发。[方法/过程] 对科学前沿相关概念、基于文本内容的科学前沿探测方法进行了系统的总结,分析了现有探测方法的优缺点。[结果/结论] 对科学前沿极其相近概念做出进一步辨析,总结目前方法存在的问题,并提出未来发展的建议。  相似文献