基于语义网的信息组织与智能导航研究   总被引：3，自引：0，他引：3  

王翠波  张玉峰  艾丹祥  金燕 《中国图书馆学报》2006,32(3)

语义网技术可以引导人们进行语义层次上的信息分类、信息标引、信息索引、信息整合等方式的信息组织,实现一个有序的信息空间。基于语义网的智能导航是利用语义机制进行导航。图3。参考文献7。  相似文献   

语义Web、本体论与信息检索     

张莉萍 《图书与情报》2007,(3):73-76

文章概述了语义Web的研究背景、研究价值及现有语义Web模型,阐述了语义Web于本体论的关系,对W3C组织的语义Web研究现状和语义Web研究领域国内外当前的研究状况进行了分析,总结了未来语义Web基础研究和应用研究的方向。  相似文献   

基于情景的Web动态导航研究*     

金燕  艾丹祥 《现代图书情报技术》2007,2(5):49-52

基于静态链的情景导航以增加线性力、牺牲自由度的方式增强导航力， 存在一定的缺陷。在分析情景、情景链及动态导航原理的基础上，探讨基于情景的Web动态导航框架模型和导航策略。该方法既可以弥补基于静态链的情景导航的缺陷，同时又能够提供多维语义导航。  相似文献   

转移性收入对收入差距的影响--以东北地区城镇居民为例   总被引：1，自引：0，他引：1  

杜鹏 《中国软科学》2004,(10):107-112

将东北三省作为一个整体区域,运用泰尔(Theil)指数及其分解方法,在测算东北城镇居民收入差距及各省所占份额的基础上,通过将转移性收入引入测度框架,发现东北城镇居民收入差距呈扩大趋势,并且不同人群的收入分布状况恶化,但三省之间的差距状况趋同,政府转移支付并没有成为缩小收入差距的手段,相反加剧了收入的不平等。  相似文献   

Prevalence of insulin resistance in first degree relatives of type-2 diabetes mellitus patients: A prospective study in north Indian population     

Arvind Kumar  Poornima Tewari  Sibasis S. Sahoo  Arvind Kumar Srivastava 《Indian journal of clinical biochemistry : IJCB》2005,20(2):10-17

A total of 172 first degree relatives (FDRs) and 178 controls were included in this study. All the cases and controls were subjected to various anthropometric measurements, fasting and postprandial glucose estimation, fasting insulin measurement and fasting lipid profile. Results revealed the prevalence of Impaired Fasting Glucose (IFG) (cases 37% Vs controls 11.6%), Impaired Glucose Tolerance (IGT) (cases 34.3% Vs controls 11.2%) and diabetes (cases 11.05% controls 3.37%) was significantly higher in first degree relatives. Insulin resistance was measured using various methods, which included fasting plasma insulin (FPI), Homeostasis Model Assessment for Insulin Resistance (HOMA_IR), insulin sensitivity index (ISI) (Mffm/l). Prevalence of insulin resistance (Insulin Resistance) as observed comparing FPI and HOMA_IR in cases and controls was 43.6% and 11.24% (P=0.005) and 37.8% and 12.47% (P=0.000) respectively. Prevalence of IR (Insulin Resistance) observed in cases having Normal Glucose Tolerance (NGT), Impaired Fasting Glucose (IFG), Impaired Glucose Tolerance (IGT) and diabetes mellitus measuring FPI Vs HOMA_IR was 37.5% vs 30.2%, 45% vs 40%, 38.98% vs 37.28% and 36.84% vs 31.57% as accordingly. However, ISI (Mffm/l) was not found to be a promising index for IR due to its poor specificity. Though HOMA is taken as gold standard for measurement of IR globally, our study observed fasting plasma insulin representing high sensitivity (89.7%) and specificity (93.3%) as compared to HOMA. Thus FPI had emerged in this work as a simple and reliable test for diagnosing insulin resistance across the population susceptible to develop diabetes including FDRs.  相似文献   

Patent document categorization based on semantic structural information     

Jae-Ho Kim  Key-Sun Choi 《Information processing & management》2007

The number of patent documents is currently rising rapidly worldwide, creating the need for an automatic categorization system to replace time-consuming and labor-intensive manual categorization. Because accurate patent classification is crucial to search for relevant existing patents in a certain field, patent categorization is a very important and useful field. As patent documents are structural documents with their own characteristics distinguished from general documents, these unique traits should be considered in the patent categorization process. In this paper, we categorize Japanese patent documents automatically, focusing on their characteristics: patents are structured by claims, purposes, effects, embodiments of the invention, and so on. We propose a patent document categorization method that uses the k-NN (k-Nearest Neighbour) approach. In order to retrieve similar documents from a training document set, some specific components to denote the so-called semantic elements, such as claim, purpose, and application field, are compared instead of the whole texts. Because those specific components are identified by various user-defined tags, first all of the components are clustered into several semantic elements. Such semantically clustered structural components are the basic features of patent categorization. We can achieve a 74% improvement of categorization performance over a baseline system that does not use the structural information of the patent.  相似文献   

耕地资源可持续利用探讨——以湄洲湾北岸经济开发区为例     

张文开 《资源科学》2002,24(1)

以福建省湄洲湾北岸经济开发区为例 ,初步认为耕地可持续利用应体现在以下 4个方面 :①耕地数量可持续 ,要维持一定的耕地数量 ,但不应盲目追求数量 ;②耕地质量可持续 ,应当着重内涵挖潜 ,提高耕地的生产力 ,以质量弥补数量的不足 ;③耕地时空可持续 ,应当是几代人以上维持耕地属性不变 ,地块位置相对稳定 ;④土地法规支持 ,应当尽快制定有关法规 ,使耕地经营权相对集中 ,以利于对耕地的投入 ,使耕地质量得到保证。  相似文献   

Incorporating affordability,efficiency, and quality in the ICT development index: Implications for index building and ICT policymaking     

Mohammad Afshar Ali  Khorshed Alam  Brad Taylor 《The Information Society》2020,36(2):71-96

Abstract

International Telecommunication Union’s ICT Development Index and related measures of a country’s ICT development maturity suffer from several limitations, including subjective estimation of the weights of individual indicators and sub-indices, use of inappropriate quantitative models, specification bias arising from the exclusion of potential predictors from the estimation models, and a failure to capture the disparities among different groups of countries. To overcome these problems and provide a more reliable measure of ICT development, this study develops the Modified ICT Maturity Level Index using the 2015 data of 166 countries. This index adds affordability, efficiency, and quality to the existing sub-indices of access, use, and skills. Sub-index and indicator weights are determined in an outcome-orientated way using Partial Least Squares Structural Equation Modeling. We find that affordability, quality, and efficiency significantly explain the variation in the level of maturity of ICT development in addition to the previously used dimensions of International Telecommunication Union’s ICT Development Index and modified ICT Development Index (mIDI) developed by Gerpott and Ahmadi, and that their explanatory power differ by a country’s level of economic development. The new index produces significantly different country rankings. This has important implications for ICT policy priorities and provides a measure of ICT development maturity less prone to the innocent or intentional distortion of such policy priorities.  相似文献   

Adaptive and maladaptive work-related motivation among teachers: A person-centered examination and links with well-being     

《Teaching and Teacher Education》2017

The primary aim of this study was to identify profiles of motivation among teachers. Using latent profile analysis among n = 519 Australian teachers, we considered multidimensional motivation by examining adaptive (self-efficacy, valuing, mastery orientation) and maladaptive motivation (anxiety, uncertain control, performance avoidance). Results revealed five distinct profiles of teachers' motivation. The study's secondary aim involved determining how the profiles are associated with well-being outcomes (work enjoyment, workplace buoyancy, work disengagement) and teachers' personal and job characteristics. Results revealed significant differences across the profiles. Together, the findings underscore the importance of attending to teachers' motivation in both research and practice.  相似文献   

被引时间异质性与被引分布均衡性相结合的期刊评价研究     

郝玉珊  李秀霞  臧思思 《情报资料工作》2020,41(2):70-76

[目的/意义]针对现有评价方法对期刊影响因素考虑不全面的问题,提出一种将期刊被引频次、被引时间异质性与被引分布均衡性相结合的期刊综合评价方法。[方法/过程]首先,基于期刊被引时间的异质性计算加权篇均被引频次;其次,利用改进后的泰尔指数衡量期刊被引分布的均衡性;最后,利用熵权法与灰色关联分析法将被引时间异质性与被引频次均衡性相结合,构建期刊综合评价指数——关联度指数(Relevance Index,简称RI)。[结果/结论]通过对国外图书情报领域的40种期刊进行实证分析,结果发现:相比于JIF和h指数,RI指数能够考虑期刊被引时间的异质性,时效性更强,权重分配更合理;RI指数能兼顾期刊被引分布的均衡性,能够识别平均影响力较强的期刊,评价结果更加客观、全面。  相似文献