期刊文献+
共找到2,027篇文章
< 1 2 102 >
每页显示 20 50 100
A New Approach for Knowledge Discovery in Distributed Databases Using Fragmented Data Storage Model
1
作者 Masoud Pesaran Behbahani Islam Choudhury Souheil Khaddaj 《Chinese Business Review》 2013年第12期834-845,共12页
Since the early 1990, significant progress in database technology has provided new platform for emerging new dimensions of data engineering. New models were introduced to utilize the data sets stored in the new genera... Since the early 1990, significant progress in database technology has provided new platform for emerging new dimensions of data engineering. New models were introduced to utilize the data sets stored in the new generations of databases. These models have a deep impact on evolving decision-support systems. But they suffer a variety of practical problems while accessing real-world data sources. Specifically a type of data storage model based on data distribution theory has been increasingly used in recent years by large-scale enterprises, while it is not compatible with existing decision-support models. This data storage model stores the data in different geographical sites where they are more regularly accessed. This leads to considerably less inter-site data transfer that can reduce data security issues in some circumstances and also significantly improve data manipulation transactions speed. The aim of this paper is to propose a new approach for supporting proactive decision-making that utilizes a workable data source management methodology. The new model can effectively organize and use complex data sources, even when they are distributed in different sites in a fragmented form. At the same time, the new model provides a very high level of intellectual management decision-support by intelligent use of the data collections through utilizing new smart methods in synthesizing useful knowledge. The results of an empirical study to evaluate the model are provided. 展开更多
关键词 data mining decision-support system distributed databases knowledge discovery in database (KDD)
在线阅读 下载PDF
A Knowledge Based Approach to Integrated Battle Damage Assessment and Repair Analysis 被引量:1
2
作者 Shi Quan Li Jianping Wang Runsheng(Department of Management Engineering, Shijiazhuang Mechanical Engineering College No.97, West Heping Rkad, Shijiazhuang ,Hebei, P.R.China, 050003E-mail:shiquan @sj-user.he.cninfo.net) 《International Journal of Plant Engineering and Management》 2000年第2期66-76,共11页
BDAR analysis is a kind of very complex analysis technology which can be used to determine the battle damage mode of equipment and relevant decision strategy. BDAR analysis is based on the information about FMEA/DMEA,... BDAR analysis is a kind of very complex analysis technology which can be used to determine the battle damage mode of equipment and relevant decision strategy. BDAR analysis is based on the information about FMEA/DMEA, MA(maintenance analysis), FTA(fault tree analysis) and vulnerability analysis. These information and analysis results are obtained on the basis of the domain expert's experience and knowledge. Upon the basis of the summary of BDARA methods, this paper provides applied knowledge database, puts forward BDARA's integrated thinking, implementing methods, and the key technology for IBDARA knowledge database's development. 展开更多
关键词 BDAR IBDARA knowledge database knowledge database approach.
在线阅读 下载PDF
Intelligent Information Management and Knowledge Discovery in Large Numeric and Scientific Databases 被引量:1
3
作者 Patrick Perrin Frederick E. Petry & William Thomason(Center for Intelligent and Knowledge-Based Systems)(Computer Science Department, Tulane University, New Orleans LA) 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1996年第2期73-86,共14页
The present article outlines progress made in designing an intelligent information system for automatic management and knowledge discovery in large numeric and scientific databases, with a validating application to th... The present article outlines progress made in designing an intelligent information system for automatic management and knowledge discovery in large numeric and scientific databases, with a validating application to the CAST-NEONS environmental databases used for ocean modeling and prediction. We describe a discovery-learning process (Automatic Data Analysis System) which combines the features of two machine learning techniques to generate sets of production rules that efficiently describe the observational raw data contained in the database. Data clustering allows the system to classify the raw data into meaningful conceptual clusters, which the system learns by induction to build decision trees, from which are automatically deduced the production rules. 展开更多
关键词 knowledge discovery in databases Machine learning Decision tree inducers
在线阅读 下载PDF
An Approach of Developing Expert System in Support of Database Management System
4
作者 Yang Kaiying Chen Shuzhen Zhang Minyou 《Wuhan University Journal of Natural Sciences》 CAS 1997年第4期71-74,共4页
A method of how to describe expert system using relative data model and the realization of inference using data search in support of database management system is introduced in this article.Thereby,the database system... A method of how to describe expert system using relative data model and the realization of inference using data search in support of database management system is introduced in this article.Thereby,the database system is promoted from data processing up to knowledge processing,and a practical method of how to develop expert system using the popular database developing tools is proposed. 展开更多
关键词 database expert system knowledge base
在线阅读 下载PDF
A Systemic Approach Integrating Genetic, Mining and Management Visions: The Geologic and Mining Knowledge System
5
作者 Nassareddine Azzouzi 《Journal of Geographic Information System》 2017年第3期390-401,共12页
Following the example of other industrial activities, mining evaluation is now exposed to socio-economical and technological constraints which are unstable in quick evolution. The keys to its success are increasingly ... Following the example of other industrial activities, mining evaluation is now exposed to socio-economical and technological constraints which are unstable in quick evolution. The keys to its success are increasingly related to a methodology of work more scientific than ever. The Systemic Approach has broadly showed its effectiveness in numerous disciplinary fields, both scientific and engineering ones: Biology, Economy, Social and Management Sciences, Quality Management, Information Systems… Helped by technological progress, this approach has especially excelled in the management of spatial information (e.g. GIS). It constitutes therefore an excellent solution to the problems of mining evaluation by the integration of genetic, mining and managerial data within an Information System, thus optimizing scientific and economic valuation of mineral resources. 展开更多
关键词 MINING Evaluation Scientific approach SYSTEMIC approach GEOLOGIC and MINING knowledge System MOROCCAN Context
暂未订购
Research on the New English Language Teaching Approach based on Sharing of the Knowledge Economy under the MOOCs Background
6
作者 Fei Ma 《International Journal of Technology Management》 2016年第3期7-10,共4页
In this paper, we conduct research on the new English language teaching approach based on sharing of the knowledge economy under the MOOC background. College English teaching is the core part of education in colleges ... In this paper, we conduct research on the new English language teaching approach based on sharing of the knowledge economy under the MOOC background. College English teaching is the core part of education in colleges and universities that are leading an indicator of college teaching can reveal most times the imprinting to teaching in colleges and universities. College English teaching from scratch, since the childhood, beyond the difficulty of the teaching area, through the teaching of confusion, but always insist on teaching idea of development as the center, continuously innovative fusion of gesture to the new development of English teaching to maximize the realization of the value of English teaching and cultivate highly qualified English talents for the society. Our research uses the MOOC platform to optimize the traditional education pattern which is innovative. 展开更多
关键词 MOOC Background English Language knowledge Economy Sharing approach.
在线阅读 下载PDF
An Analysis of Knowledge Sharing Approaches for Emerging-technology-based Strategic Alliances in Electronic Industry
7
作者 刘炬 李永建 《Journal of Electronic Science and Technology of China》 2006年第4期364-368,共5页
Emerging technologies are now initiating new industries and transforming old ones with tremendous power. They are different games compared with established technologies with distinctive characteristics of knowledge ma... Emerging technologies are now initiating new industries and transforming old ones with tremendous power. They are different games compared with established technologies with distinctive characteristics of knowledge management in knowledge-based and technological-innovation-based competition. How to obtain knowledge advantage and enhance competences by knowledge sharing for emerging-technology-based strategic alliances (ETBSA) is what we concern in this paper. On the basis of our previous work on emerging technologies' distinctive attributes, we counter the wide spread presumption that the primary purpose of strategic alliances is knowledge acquiring by means of learning. We offers new insight into the knowledge sharing approaches of ETBSAs - the knowledge integrating approach by which each member firm integrates its partner's complementary knowledge base into the products and services and maintains its own knowledge specialization at the same time. So that ETBSAs should plan and practice their knowledge sharing strategies from the angle of knowledge integrating rather than knowledge acquiring. A four-dimensional framework is developed to analyze the advantages and disadvantages of these two knowledge sharing approaches. Some cases in electronic industry are introduced to illustrate our point of view. 展开更多
关键词 emerging technology strategic alliances knowledge sharing approach electronic industry
在线阅读 下载PDF
Divide and recombine approach for warranty database: estimating the reliability of an automobile component
8
作者 Md Rezaul Karim 《Data Science and Management》 2024年第2期119-128,共10页
The continuously updated database of failures and censored data of numerous products has become large, and on some covariates, information regarding the failure times is missing in the database. As the dataset is larg... The continuously updated database of failures and censored data of numerous products has become large, and on some covariates, information regarding the failure times is missing in the database. As the dataset is large and has missing information, the analysis tasks become complicated and a long time is required to execute the programming codes. In such situations, the divide and recombine (D&R) approach, which has a practical computational performance for big data analysis, can be applied. In this study, the D&R approach was applied to analyze the real field data of an automobile component with incomplete information on covariates using the Weibull regression model. Model parameters were estimated using the expectation maximization algorithm. The results of the data analysis and simulation demonstrated that the D&R approach is applicable for analyzing such datasets. Further, the percentiles and reliability functions of the distribution under different covariate conditions were estimated to evaluate the component performance of these covariates. The findings of this study have managerial implications regarding design decisions, safety, and reliability of automobile components. 展开更多
关键词 Weibull regression model Warranty database RELIABILITY EM algorithm Divide and recombine approach Managerial implications
在线阅读 下载PDF
Toward a Large Language Model-Driven Medical Knowledge Retrieval and QA System:Framework Design and Evaluation
9
作者 Yuyang Liu Xiaoying Li +6 位作者 Yan Luo Jinhua Du Ying Zhang Tingyu Lv Hao Yin Xiaoli Tang Hui Liu 《Engineering》 2025年第7期270-282,共13页
Recent advancements in large language models(LLMs)have driven remarkable progress in text process-ing,opening new avenues for medical knowledge discovery.In this study,we present ERQA,a mEdical knowledge Retrieval and... Recent advancements in large language models(LLMs)have driven remarkable progress in text process-ing,opening new avenues for medical knowledge discovery.In this study,we present ERQA,a mEdical knowledge Retrieval and Question-Answering framework powered by an enhanced LLM that integrates a semantic vector database and a curated literature repository.The ERQA framework leverages domain-specific incremental pretraining and conducts supervised fine-tuning on medical literature,enabling retrieval and question-answering(QA)tasks to be completed with high precision.Performance evaluations implemented on the coronavirus disease 2019(COVID-19)and TripClick data-sets demonstrate the robust capabilities of ERQA across multiple tasks.On the COVID-19 dataset,ERQA-13B achieves state-of-the-art retrieval metrics,with normalized discounted cumulative gain at top 10(NDCG@10)0.297,recall values at top 10(Recall@10)0.347,and mean reciprocal rank(MRR)=0.370;it also attains strong abstract summarization performance,with a recall-oriented understudy for gisting evaluation(ROUGE)-1 score of 0.434,and QA performance,with a bilingual evaluation understudy(BLEU)-1 score of 7.851.The comparable performance achieved on the TripClick dataset further under-scores the adaptability of ERQA across diverse medical topics.These findings suggest that ERQA repre-sents a significant step toward efficient biomedical knowledge retrieval and QA. 展开更多
关键词 Large language models Medical knowledge Information retrieval Vector database
在线阅读 下载PDF
基于知识图谱的农业园区供用能系统优化策略检索方法
10
作者 牛焕娜 陆佳琳 +3 位作者 郭庭悦 李宗航 周安宇 李春毅 《农业工程学报》 北大核心 2026年第1期233-244,共12页
为了提升农业园区智能化调控性能,该研究提出了基于知识图谱的农业园区供用能系统调控策略检索方法。首先,构建农业园区供用能系统结构化数据特征提取体系,通过区间化处理形成数据特征标签库;其次,利用深度学习技术实现命名实体及其关... 为了提升农业园区智能化调控性能,该研究提出了基于知识图谱的农业园区供用能系统调控策略检索方法。首先,构建农业园区供用能系统结构化数据特征提取体系,通过区间化处理形成数据特征标签库;其次,利用深度学习技术实现命名实体及其关系的识别,并借助Neo4j图数据库构建知识图谱;进而提出了基于知识图谱的农业园区供用能系统优化策略检索方法,从而根据待优化运行场景的数据特征逐层检索出对应调控策略。仿真算例验证表明,该方法较传统建模优化算法将策略生成时长从22.500 s缩短至2.162 s,能够有效提升策略生成效率,并形象化展示运行场景的多维度特征及其策略匹配路径,为农业园区供用能系统的智能化决策提供支持。 展开更多
关键词 知识图谱 农业园区 供用能系统 调控策略 Neo4j图数据库
在线阅读 下载PDF
中国图书馆学自主知识体系构建的逻辑起点、理论探索与发展路径
11
作者 柯平 张瑜祯 《中国图书馆学报》 北大核心 2026年第1期4-20,共17页
构建中国图书馆学自主知识体系是学科发展和文化传承的必然要求。文章主要回答三个问题:中国图书馆学构建自主知识体系的逻辑起点在哪里;中国图书馆学自主知识体系的百年探寻和发展脉络是什么;中国图书馆学自主知识体系的构建应从哪些... 构建中国图书馆学自主知识体系是学科发展和文化传承的必然要求。文章主要回答三个问题:中国图书馆学构建自主知识体系的逻辑起点在哪里;中国图书馆学自主知识体系的百年探寻和发展脉络是什么;中国图书馆学自主知识体系的构建应从哪些方面展开。源于校雠学的中国图书馆学,在两千余年发展历程中,总结出以求书、藏书、管书、用书为核心的文献知识体系,这是中国图书馆学自主知识体系构建的逻辑起点;近现代以来,中国图书馆学百余年发展中积累了图书馆学教育、图书分类整理和图书馆学理论等知识体系;新时代,中国图书馆学自主知识内涵得以扩展,自主知识体系的构建应围绕基础知识层、应用知识层和拓展知识层展开,涵盖理论基础、基本知识、研究方法、分支领域等方面。图1。表1。参考文献44。 展开更多
关键词 中国图书馆学 自主知识体系 逻辑起点 理论探索 发展路径
在线阅读 下载PDF
Ei Village 2和Web of Knowledge数据库平台的比较分析 被引量:8
12
作者 罗春荣 《图书馆论坛》 CSSCI 北大核心 2004年第2期82-86,共5页
以INSPEC数据库为例 ,比较和分析了EiVillage 2和WebofKnowledge在检索功能、检索结果的处理、整合功能、个性化服务、检索效率及管理功能等方面的异同 。
关键词 数据库检索 检索平台 Ei VILLAGE 2 Web of knowledge 检索功能 检索结果 个性化服务 检索效率
在线阅读 下载PDF
考虑时空特征及演化关系的行政区划知识图谱构建
13
作者 王春玲 诸云强 +3 位作者 王曙 刘纪猛 冯敏 高振记 《地球信息科学学报》 北大核心 2026年第1期89-104,共16页
【目的】行政区划是行政管理、资源配置和社会经济统计的基础单元。频繁调整导致名称、类型、区划代码及空间范围不断变化,增加了跨年度统计分析和历史追溯的难度,对区域规划和政策实施造成挑战。针对这一问题,本文提出面向复杂时空演... 【目的】行政区划是行政管理、资源配置和社会经济统计的基础单元。频繁调整导致名称、类型、区划代码及空间范围不断变化,增加了跨年度统计分析和历史追溯的难度,对区域规划和政策实施造成挑战。针对这一问题,本文提出面向复杂时空演化的行政区划知识图谱构建方法,旨在实现行政区划演变的统一语义化表达与智能化管理。【方法】为解决传统GIS难以形式化表达复杂沿革关系与动态演变过程的局限性,本文设计了语义一致的行政区划本体模型,并提出“主-谓-宾-时间”四元组表达框架,系统定义行政区划单元的概念、属性和关系。以1949—2023年中国省、市、县级行政区划长时序矢量数据为基础,采用空间叠加与属性匹配的方法,识别名称变更、行政类型调整、区划代码变更、划入、划出及空间范围变化等沿革事件。基于Neo4j图数据库环境,构建行政区划演变知识图谱,实现行政区划演变知识的结构化管理。【结果】构建的知识图谱包含26269个节点和406744个三元组,完整记录1949—2023年省、市、县级行政区划的名称、代码、面积及演变类型等信息。基于图谱共识别出33507次沿革事件,实现了行政区划的时空演变查询、跨时空逻辑推理与知识发现,以及跨年度统计数据矫正等应用。【结论】本研究突破传统GIS难以刻画复杂时空关系的局限,为行政区划的沿革研究提供了新的技术手段,并为其他地理实体的复杂时空知识建模提供了借鉴。 展开更多
关键词 行政区划 本体模型 知识图谱 时空特征 演变分析 图数据库
原文传递
ISI Web of Knowledge INSPEC数据库检索系统 被引量:7
14
作者 冯花朴 《现代图书情报技术》 CSSCI 北大核心 2003年第4期52-54,80,共4页
介绍了美国 ISI出版的 Web of Knowledge INSPEC数据库检索系统 ,探讨了该系统的特点、检索方法。
关键词 ISI Web-of-knowledge-INSPEC数据库检索系统 科学文摘 特点 检索方法 结果处理方法
在线阅读 下载PDF
知识生产范式下高等教育知识政策优化的逻辑与进路
15
作者 陈正权 李恋 《吉林大学社会科学学报》 北大核心 2026年第1期183-192,270,共11页
知识政策优化是适应新的知识生产范式转变的重要基础。高等教育知识政策优化的逻辑审思要体现社会认识论发展的前瞻式理论遵循、知识生产模式变革的响应式现实遵循、学术建制重构的系统式技术遵循、学科部落文化融合的生态式文化遵循。... 知识政策优化是适应新的知识生产范式转变的重要基础。高等教育知识政策优化的逻辑审思要体现社会认识论发展的前瞻式理论遵循、知识生产模式变革的响应式现实遵循、学术建制重构的系统式技术遵循、学科部落文化融合的生态式文化遵循。当前,高等教育知识政策优化面临着知识生产力的结构性矛盾、知识治理张力的现实性偏差、知识数字化转型的适应性挑战、公众认可的合法性危机等现实问题,有必要规避“价值无涉”以秉持理性的教育立场,聚焦“三维四体”以推动治理范式协同,超越“知识传递”以构建知识生产与创新协同体,利用“数字赋能”以打造数字时代知识新基建,突显“创新开放”以形成集群式知识生态系统,为赋能教育强国建设提供适配性的政策基础并注入持续性的发展动力。 展开更多
关键词 高等教育 知识生产 知识政策优化 逻辑与进路
原文传递
面向国门生物安全的疫情防控知识图谱构建
16
作者 邢邗 王柄熹 +1 位作者 朱永健 刘奕 《安全与环境学报》 北大核心 2026年第3期1111-1119,共9页
为加强空港口岸的疫情防控能力,提供便利化结构化的知识体系,提出了环节、任务、角色、产品的多层级标准化知识框架。基于防控方案和传染病特性共205万字数据,采用规则和深度学习模型相结合的方法识别知识节点与关系,构建了包含2725个... 为加强空港口岸的疫情防控能力,提供便利化结构化的知识体系,提出了环节、任务、角色、产品的多层级标准化知识框架。基于防控方案和传染病特性共205万字数据,采用规则和深度学习模型相结合的方法识别知识节点与关系,构建了包含2725个知识节点和5851个关系的多层级知识体系,支持便利化体系化的查询和展现疫情防控需要的环节、任务、人员、能力、设备、应对的传染病特性等数据,为空港口岸的疫情防控提供技术与知识支持。 展开更多
关键词 安全系统学 生物安全 疫情防控 知识图谱 图数据库
原文传递
ISI Web of Knowledge跨库检索功能与操作技巧 被引量:3
17
作者 袁希蓓 《新世纪图书馆》 2005年第2期50-52,共3页
ISI Web of Knowledge是新一代的学术信息资源整合体系,是Web of science的最新升级平台。 本文主要介绍了这一体系的跨库检索功能及其操作技巧。
关键词 操作技巧 检索功能 ISI WEB of science 学术信息资源 WEB 整合体
在线阅读 下载PDF
知识增强的时间序列异常检测算法自动选择
18
作者 梁志宇 蔡东芮 +3 位作者 梁晨 梁峥 王宏志 郑博 《软件学报》 北大核心 2026年第2期799-816,共18页
时间序列异常检测技术在许多实际应用中发挥着重要作用.例如,云原生数据库系统通过监测关键指标(如CPU和内存使用情况)实现系统故障的及时识别.尽管近年来已经提出了许多先进的时间序列异常检测算法,但研究表明,在异常检测准确率方面,... 时间序列异常检测技术在许多实际应用中发挥着重要作用.例如,云原生数据库系统通过监测关键指标(如CPU和内存使用情况)实现系统故障的及时识别.尽管近年来已经提出了许多先进的时间序列异常检测算法,但研究表明,在异常检测准确率方面,不同算法擅于应对不同的应用场景,没有通用的最佳方法.因此,为了实现更高的异常检测准确率,研究如何基于不同场景的数据特征自动选择最佳时间序列异常检测算法的问题尤为重要.现有方法通常基于时间序列分类(TSC)技术来解决这一问题.实现方法是利用历史任务积累的数据,以时间序列为输入、对应的最准确异常检测算法为输出训练分类器,从而预测未知时间序列的最佳异常检测算法.尽管这类基于TSC的解决方案能有效提高异常检测准确率,但现有的标准TSC算法未能充分利用来自异常检测历史任务的知识.为弥补这一缺陷,提出一个知识增强的时间序列异常检测框架.在训练TSC模型时,不仅使用现有方法普遍采用的、代表每个历史时间序列最佳检测算法的硬标签,还利用历史数据上所有候选算法的准确率来估计输入时间序列的类别分布,将其作为软标签来为算法选择器(即TSC模型)提供更多关于异常检测算法之间相互关系的知识.与此同时,设计了一个外部知识融合模块,可以灵活地将各类外部知识(例如时间序列的应用领域及数据与异常特点的描述)融入TSC模型中.所提方法能够作为插件无缝集成到任意架构的TSC模型中,提高其在异常检测算法选择方面的性能.在多种类型的时间序列数据集上进行大量实验,验证所提方法的有效性. 展开更多
关键词 时间序列异常检测 自动算法选择 时序数据分析 知识增强型系统 面向数据库的人工智能
在线阅读 下载PDF
ISI Web of Knowledge集成检索平台评析 被引量:5
19
作者 陈朋 《图书馆杂志》 CSSCI 北大核心 2004年第9期55-59,共5页
本文从资源整合与集成检索的角度出发,对 ISI Web of KnowledgeSM 平台的集成化信息检索机制作了一个全面的解析;同时指出其优势与不足之处,希望为我国图书情报机构打造成熟的、满足用户方便、快捷获取所需信息的检索平台提供一点借鉴。
关键词 ISI WEB of knowledge 美国科技情报研究所 信息检索平台 集成检索 数据库检索 跨库检索
在线阅读 下载PDF
药理学智慧教育模式的数字化转型路径探究
20
作者 文静 罗丽君 +2 位作者 田瑞敏 张建武 贾钦尧 《大理大学学报》 2026年第2期81-85,共5页
目的:探究药理学智慧教育模式的数字化转型路径。方法:以超星学习通平台为依托,遵循以学生为中心、情境化学习与过程性评价原则,设计“课前智能导学—课中沉浸互动—课后巩固拓展”的“三阶段递进式”教学模式。通过任务引擎重构教学流... 目的:探究药理学智慧教育模式的数字化转型路径。方法:以超星学习通平台为依托,遵循以学生为中心、情境化学习与过程性评价原则,设计“课前智能导学—课中沉浸互动—课后巩固拓展”的“三阶段递进式”教学模式。通过任务引擎重构教学流程,利用知识图谱实现知识关联与个性化学习路径推荐。结果:该教学方法符合学生循序渐进的学习需求,活跃了课堂氛围,提升学生的学习兴趣,破解了传统及现有混合式教学模式在个性化服务、过程性评价及成效量化方面的难题。结论:“三阶段递进式”教学模式能有效提升教学互动性、学生学习效率及其临床知识应用能力,为药理学乃至医学教育的数字化转型与AI课程建设提供了可借鉴的路径与实践案例。 展开更多
关键词 教育数字化转型 药理学 智慧教育 任务引擎 知识图谱
在线阅读 下载PDF
上一页 1 2 102 下一页 到第
使用帮助 返回顶部