科学知识图谱：别样视角扫描《编辑学报》

科学知识图谱是科学计量学研究领域新的研究方法,为期刊研究提供了重要手段。下载中文社会科学引文索引（CSSCI）收录《编辑学报》1998-2009共12年的题录数据,区别于传统期刊文献计量方法,从作者同被引、关键词共现、机构合作、作者合著、期刊共被引、文献共被引等方面绘制科学知识图谱,快速扫描图谱蕴含的信息,揭示期刊的载文及其学术影响特征。     

基于本体与规则的语义推理研究

为解决本体相关概念的共享和信息集成,发现本体间的语义关联,提出了本体与规则整合下的语义推理模型ORRM,构建了家庭本体FO。将推理集中在两个不同层次,第一层的推理使用Racer推理机进行描述逻辑的推理,检测本体的冲突。第二层使用本体中表示的概念和属性制定成员规则库,采用基于XML的SWRL呈现规则和Jess推理引擎,增加了本体概念问语义的关联。该模型在本体中引入规则表示,弥补了OWL DL在推理机制上的不足,推导出的新本体在原本体的基础上实现了本体成员间隐含关系的语义推理,完善了本体知识库的内容。在语义Web领域,该模型的应用能够提高本体知识的利用率。     

基于领域本体的语义文本挖掘研究

为了提高文本挖掘的深度和精度,研究并提出了一种基于领域本体的语义文本挖掘模型.该模型利用语义角色标注进行语义分析,获取概念和概念间的语义关系,提高文本表示的准确度;针对传统的知识挖掘算法不能有效挖掘语义元数据库,设计了一种基于语义的模式挖掘算法挖掘文本深层的语义模式.实验结果表明,该模型能够挖掘文本数据库中的深层语义知识,获取的模式具有很强的潜在应用价值,设计的算法具有很强的适应性和可扩展性.     

Exploring geographic disparities in broadband access and use in rural southern Illinois: Who's being left behind?

Recent literature about broadband telecommunications reveals two major areas that are not only globally gaining prominence, but are also demanding urgent attention from a research perspective. One of the key areas is related to the need to spatially evaluate the availability and deployment of broadband services, especially among urban versus rural communities. Another area of interest falls under the need for enabling broadband policies and strategies that address existing geographic disparities. These motivating factors shaped this research and provided a basis for defining three specific objectives, namely: (1) to identify locations with or without broadband access, (2) to identify underserved rural and inner-city markets, and (3) to determine whether university and community college towns can be used in the adoption and dispersion of broadband technologies in southern Illinois. Supply-side and demand-side data were collected and inputted into a Geographic Information System (GIS). Supply-side data included cable modem, digital subscriber lines (DSL), wireless, and fiber optic lines, while demand data included reported broadband requests from individuals without access (n = 439), students (n = 45,866), and higher education workforce (n = 5419). Using the GIS and statistical techniques, insightful maps of broadband infrastructure were created to illustrate areas of supply and demand so that governments and businesses can address existing gaps in consumer needs. Specifically, different levels of broadband access and use were mapped; different under-served rural and inner-city markets were identified so as to emphasize the dramatic economic impact on the business opportunities available to small business entrepreneurs. Also, different geographies of use and accessibility of broadband connectivity in the study region were synthesized to support decision-making. The resulting maps provided supply and demand marketing intelligence based on the geographic analyses of residential and enterprise sectors. These data can be used as a model to develop specific policy recommendations for a knowledge-based economy, specifically for the southern Illinois region or other rural communities in the United States.     

国家信息政策体系研究——领域划分与结构分析

文章首先确定了国家信息政策80个主要关键词,在此基础上,运用共词分析,聚类出了信息政策5个子领域,并将其呈现在映射图中,以展现信息政策体系结构.进一步地,将其同Rowlands的结果对比分析,发现我国关于隐私保护方面存在政策缺失,以及在信息社会和基础设施方面更多地是使用了国家力量.     

消费级平板扫描仪的边界效应

由于光照的非均匀性和传感器对不同空间位置响应的差异,几乎所有的平板扫描仪都存在边界效应问题,以水平边界效应更为明显。本文测量了ScanMaker4850m扫描仪对未印刷白色静电复印纸的响应值,证明确实存在边界效应。     

Study of resonance-cone propagation in truncated hyperbolic metamaterial grids using transmission-line matrix simulations

In this paper, we utilize transmission-line matrix simulations to study the electromagnetic properties of hyperbolic metamaterial grids, which are synthesized by arranging unloaded transmission lines over electrical ground planes, such that the unit cells are rectangular in shape. The hyperbolic grids support Bragg and Hyperbolic resonant modes that have rectangular and hyperbolic dispersion surfaces, respectively. We demonstrate the formation of these resonant modes in the hyperbolic grids and their refraction, and spatial scanning properties via circuit simulations. The simulation results are compared with experimental results of a two-layer anisotropic hyperbolic metamaterial.     

多应用域交换平台交换规则的结构分析与定制

目前国内数据交换平台大部分基于数据映射模式,交换的系统之间耦合度高,生命周期短,运维成本大。鉴于此,提出了基于交换规则的多应用域交换平台方向,对其基本术语进行了定义,交换规则的结构进行了分析,定制流程进行说明,并通过示例进行了验证。     

基于跨领域知识的基金评论情感分析

对互联网上的基金评论进行情感倾向性分析,能够对中小投资者提供有益的帮助。由于这类评论未标注且样本数量相对较少,限制了基于统计的传统算法的性能。因此,通过引入其他领域的已标注评论,研究了使用PMI、SI词素算法实现跨领域知识转移的可能性。实验表明,基于其他领域知识的词素算法获得了更好的性能。对于基金评论来说,引入其他领域的已标注评论,通过使用词素算法,能够实现知识转移并促进系统性能的提升。     

基于GIS的区域关键性生态用地空间结构识别方法探讨

随着我国城镇化进程的加速,如何协调好城镇建设与地域生态系统的关系成为当前规划界的热点问题之一。本文基于GIS技术,从水资源安全、生物多样性保护、灾害规避与防护和自然游憩等4个方面,构建了空间尺度上的生态用地重要性综合指数和区域关键性生态用地空间结构识别方法,并进行了京津冀地区的实例研究。结果表明,京津冀地区核心型生态用地的面积为54943.87km2,占全区总面积的1/4,分布在西北部山区,主要是区域的河流水系、湿地、自然保护区、森林公园和风景名胜区的核心区,是维护区域生态安全的底线生态用地。识别结果能较好地反映关键性生态用地维护区域水、生物、灾害防护和游憩安全的空间特征。该识别方法将有利于指导我国土地的生态管理,开展生态保育和生态建设,维护区域生态系统健康与安全。