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探讨了Elearning及本体,提出了基于本体的Elearning系统层次结构模型,并重点研究了本体在其中的应用:用于描述学习材料语义的内容本体,用于定义学习材料上下文的上下文本体以及用于在学习课程中组织学习材料的结构本体。 相似文献
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语义Web技术应用于上下文感知的智能移动服务,通过构建上下文信息本体,使得移动服务的实体之间可以进行上下文信息共享和语义互操作,并进行上下文信息推理,实现智能服务。本文首先介绍了语义Web及本体技术,其次阐述了语义Web技术应用于上下文感知的移动服务,然后详细分析了智能移动服务中的上下文信息本体构建,包括通用的上下文信息本体、用户概况本体、情境本体以及服务本体等,接着介绍了相关的研究项目,最后进行展望和总结。 相似文献
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觉察上下文计算(Context-Awareness Computing)中必然涉及到知识的共享,引入了本体融合(Ontology Fusion)概念,构建了一个基于本体的觉察上下文计算模型,讨论了该模型的基本框架,分析了上下文信息的获得,设计了上下文信息与本体库的映射过程,研究了本体融合、本体信息存储以及本体库与行为的映射中的相关问题。结合普适计算场景,用实例演示了该模型的运行过程。 相似文献
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针对使用传统的用于本体排序的方法得到的排序结果不够准确的问题,提出了一种新的内容分析方法。首先通过构造本体的概念模型提取本体的主题词集合得到本体的主题相似度;然后通过对关键词所在的本体上下文进行分析,得到本体相对于关键词的上下文相关度;最后结合主题相似度和上下文相关度得到本体相对于关键词的综合评价值并进行排序。实验结果表明,该方法可以有效地提高本体排序的准确性。 相似文献
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为了有效解决泛在网络环境下Web服务质量上下文描述问题,在OWL_S基础上提出了面向服务组合的复杂上下文本体模型-OWL_S_QoS+,包括用户上下文本体和服务上下文本体。用户上下文本体描述用户的环境状态、拥有的资源信息、用户需求及用户群组等对服务或组合服务运行产生影响的一系列属性;服务上下文本体在原有OWL_S定义的基础上,增加了服务对客户端与服务端的运行环境需求、不确定性QoS描述方法。通过模型比较验证了OWL_S_QoS+具有较强的描述能力。 相似文献
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针对现代企业门户个性化、智能化的需求,将语义Web技术、上下文感知技术与门户技术结合起来,设计了一个可用于建立智能门户系统的上下文感知的模型视图控制器 (MVC)框架CA-MVC.通过分析MVC模式的特点,定义了时序上下文本体,并详细阐述了上下文服务器中上下文获取模块、上下文推理模块以及上下文服务模块的功能.最后,结合在工作流门户系统中的应用,满足了通过门户为用户提供智能服务的需求. 相似文献
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针对当前E-learning系统中存在着堆砌教学资料和学习内容单一、个性化不足等问题,设计一个基于Web2.0和本体检索技术的个性化E-learning系统,通过应用Ajax和RSS聚合技术以及Ontology本体技术,使得该系统能根据学习者的知识结构、学习目标、学习风格、偏好等特征信息提供适应学习者的教学方法和学习资源,营造个性化的网络学习环境。实验结果表明该系统能有效促进学生网络学习的效率,满足学生个性化学习的需求。 相似文献
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E-learning是信息时代的产物,是学习形式、学习手段和学习方法的革命.但是,E-learning面临一个重大挑战,即如何表示教学内容的丰富语义.根据现代认知心理学理论,从教育教学规律出发,提出一种教学领域本体的构建方法.借助该方法,设计和建立了C类程序设计课程领域本体.实践证明它能满足用户自适应学习的需求,降低教师的教学难度和学生的学习难度.构建的领域本体对“C程序设计”和“C++程序设计”这两门课程知识组织结构形成了共同理解与认识,为进一步建立支持个性化语义检索的课程资源网络系统奠定了基础. 相似文献
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针对符合SCORM规范的教学资源,提出一个具有效语义搜索功能的E-learning模型。通过SCORM本身对LOM学习对象已规定好丰富的Meta-data,并引进本体工程理论(Ontological Engineering),对不同的符合SCORM规范的教学资源(教材)加以分析、对比、归纳、关联、评估、推荐,使得不同的E-leaming中的教材得以串联,以辅助网络学习平台对SCORM教材能进行更精确的分类管理工作。而学习者通过网络学习教材中找到所需要的资料,改善以往查询准确度不够高的问题。 相似文献
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Kun Hua Tsai Tzone I. Wang Tung Cheng Hsieh Ti Kai Chiu Ming Che Lee 《Expert systems with applications》2010,37(1):774-786
For the majority of E-learning systems their important role is the electronic teachers who can assist students to learn and review courses enrolled. Unfortunately, an E-learning system does not resemble a teacher who can evaluate the current students’ learning status by the immediate class observations and adjust his/her policy accordingly. Hence, to be able to dynamically compose tests to examine students’ learning status and clear their confusions becomes an important issue. This paper argues that how to formalize test requirements dynamically and how to select suitable items effectively are two main challenges in the current researches of computerized test generation. Hence, this article proposed a novel approach that can compose suitable tests to easily and efficiently evaluate the learning statuses of students. The proposed approach obeys the Discrete Particle Swarm Optimization (DPSO) scheme and uses partial course ontology to generate tests according to the studied materials. Besides, it also harnesses the notion of testlets to construct testlet-based tests for students. In the experiments, the results show that the proposed approach can effectively formalize the tested concepts and their weights, and also generate the well-scrutinized test in accordance with the test requirements in the acceptable time. 相似文献
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Haiyang Jia Minhong Wang Weijia Ran Stephen J.H. Yang Jian Liao Dickson K.W. Chiu 《Expert systems with applications》2011,38(4):3372-3382
E-learning is emerging as a popular learning approach utilized by many organizations. Despite the ever increasing practices of e-learning in the workplace, most e-learning applications fail to meet learners’ needs or serve organization’s quests for success. Significant gaps exist between organizational interests and individual needs when they come to e-learning, which make e-learning applications less goal-effective. To solve this problem, a performance-oriented approach is presented in this study. Key performance indicators (KPIs) are set up to clarify organizational training needs, and help learners establish rational learning objectives. In addition, ontology is used for constructing formal and machine-understandable conceptualization of the performance-oriented learning environment. Using this approach, a KPI-oriented learning ontology and prototype system have been developed and evaluated to demonstrate the effectiveness of the approach. 相似文献
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New information and communication technologies and emerging learning models have triggered a new wave of educational innovation-electronic learning (E-learning). This study utilizes a hypercube innovation model to analyze the differences in technology and learning models (instruction model/environment) used in traditional classroom learning versus E-learning environments. The results show that the innovation from traditional classroom learning to E-learning is radical for both the learner and instructor, leading to drastic changes in the technology and learning model. For educational institutions, the technology is a fundamental change, while the learning model is reinforced. From the dynamic capability perspectives, a set of core capabilities needed for successfully exploiting E-learning is identified. These results provide insight for learners, instructors and educational institutions for enhancing their understanding of E-learning innovation, and provide guidelines to help E-learning stakeholders adapt from the traditional classroom to E-learning environments. 相似文献
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随着电子学习系统快速的发展,电子学习资源呈现爆炸式的增长,如何有效地组织海量电子学习资源成为构建高效电子学习系统的重要因素。针对现有资源库在资源组织方面存在的不足,提出了一个基于领域知识本体的电子学习资源库检索模型,该模型利用领域知识来构建领域知识本体库并通过抽取电子学习资源元数据构建元数据库,通过映射关系完成对电子学习资源的语义组织,并在此基础之上构建一个语义检索模型,以有效地解决现有电子学习资源检索中丢失语义背景的问题,使检索结果在查全率、查准率方面有所提高,更加符合用户的需求。 相似文献