重采样在微博机器人识别中的应用研究

随着微博机器人账户的不断增多,对其识别检测已成为当前数据挖掘领域的热点问题.已有的微博机器人识别研究多使用爬取搜集的相关数据,在小规模平衡分布的机器人与普通用户数据集上训练并验证算法模型,在样本分布不平衡的真实情况下存在局限性.重采样是一种针对不平衡数据集分类的常用技术,为探究重采样对相关监督学习机器人识别算法的影响,...     

面向微博短文本的社交与概念化语义扩展搜索方法

充分挖掘微博短文本的语义以实现精准搜索是一项重要任务.由于微博文本内容具有稀疏性和语义局限性的特点,使得仅通过分析字面语义来进行短文本理解和相似性匹配的传统搜索方法受到了一定的限制.因此提出了一种社交与概念化语义结合的扩展搜索方法,通过挖掘社交网络独特的社交属性如#标签#、“@”和链接信息URL,对微博短文本实现进一步的社交语义扩展.该方法将文本字面分析获取的概念词语和社交关系中潜在的关联标签信息相结合,对短文本进行2种角度下的语义特征表示,实现了基于微博短文本语义充分理解的精准搜索.在微博数据集上的对比实验表明,与已有的扩展搜索方法相比所提方法能捕捉更多的语义特征,微博搜索的性能也得到了显著的提升.     

基于动量模型的微博突发话题检测方法

针对微博特征空间动态变化、信息噪音大的特点,提出一种基于有意义串动量模型的微博突发话题检测方法.提取时间窗口内微博信息流的有意义串,作为微博信息的动态特征,根据动力学原理对特征进行动量建模,结合特征能量大小、变化趋势以及二阶变化率检测突发特性有意义串,即突发特征,合并突发特征形成突发话题.微博数据实验表明,该方法适用于在线微博突发话题检测,在准确率和召回率上都有明显提升.     

浅析细河城市段防洪工程建设对环境的影响

辽宁省阜新市新建成的4座橡胶坝、主河槽与游览路、河堤和防洪抢险路与城市中心段已有的5座桥和城区排污暗管一起,将城区污水排入下游的污水处理厂。这样,城市的防洪保安问题将得到根本的解决,同时也为搞好经济转型,创造良好的自然和社会环境。     

Advanced lexical ontologies and hybrid knowledge based systems: First steps to a dynamic legal electronic commentary

Legal Information Retrieval (IR) research has stressed the fact that legal knowledge systems should be sufficiently capable to interpret and handle the semantics of a database. Modeling (expert-) knowledge by using ontologies enhances the ability to extract and exploit information from documents. This contribution presents theories, ideas and notions regarding the development of dynamic electronic commentaries based on a comprehensive legal ontology. This Article is based on a paper presented at the LOAIT Workshop in conjunction with the ICAIL Conference 2005, Bologna.     

Online Burst Events Detection Oriented Real-Time Microblog Message Stream

The rapid spread of microblog messages and sensitivity of unexpected events make microblog become the public opinion center of burst events. Online burst events detection oriented real-time microblog message stream has become an important research problem in the field of microblog public opinion. Because of the large amount of real-time microblog message stream and irregular language of microblog message, it is important to process real-time microblog message stream and detect burst events accurately. In this paper, an online burst events detection framework is proposed. In this framework, abnormal messages are detected based on sliding time window and two-level hash table. Combined with event features, an online incremental clustering algorithm is used to cluster abnormal messages and detect burst events. Experimental results in the real-time microblog message stream environment show that our framework can be used in online burst events detection and has higher accuracy compared with other approaches.     

Pseudoreplication conventions are testable hypotheses.

Hurlbert’s conceptions of pseudoreplication, such as the loss of independent replicates with repeated sampling over time and the lack of appropriate spatial interspersion of experimental units to achieve statistical independence, are really theoretical hypotheses that warrant empirical confirmation or disconfirmation. Schank and Koehnle have provided a valuable service to researchers in ecology, conservation biology, and animal behavior using logical argument and repeated Monte Carlo simulations to challenge Hurlbert’s theoretical assumptions about statistical independence. Their simulations showed that averaging samples to produce a single datum destroys the information within experimental units and is mathematically equivalent to the treatment level in a nested analysis of variance. Such results counter Hurlbert’s argument that pooling is wrong. Rigid thinking about sampling, as engendered by Hurlbert’s pseudoreplication arguments, does not promote the exploration of new methodologies and there is something disturbingly inconsistent with the scientific method when journal editors and reviewers adopt Hurlbert’s pseudoreplication arguments unquestionably. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

矿物/聚合物复合高吸水材料制备及评述

本文对矿物／聚合物复合高吸水材料制备的主要工艺进行了介绍和评述，重点讨论了丙烯酸盐／膨润土／淀粉复合高吸水材料的性能。     

徐州地区废黄河治理工程评述

根据江苏省徐州市境内废黄河的自然地理环境和水文特点,分析了铜山县废黄河治理工程中存在的主要问题,从治理标准、防洪除涝、供水等方面对废黄河综合治理作了阐述,并对其项目实施效果进行了评价.     

大学生微博中的英语使用情况调查及反思

采用问卷调查与访谈的方法,考察学生在微博中使用英语的频率和动机,调研微博中英语使用的模式与认可度,分析大学生微博英语使用的特征。微博中英语使用的认可度和关注度受到质疑,语言的正确表达也存在一定问题。语言教育工作者、微博网站、微博英语使用者应从弘扬中华民族的传统文化出发,从学习英语出发,规范微博语言的使用。