一种基于领域本体的用户建模方法

针对当前大多数个性化服务系统的不足,以旅游领域为背景,提出了一种新的基于本体的用户模型构建方法,利用领域本体中的概念、实例和属性描述用户兴趣特征,实现了在语义层次上理解用户兴趣。实验表明,该方法能有效提高用户模型的质量。     

Agent-based architecture for context-aware and personalized event recommendation

In order to offer context-aware and personalized information, intelligent processing techniques are necessary. Different initiatives considering many contexts have been proposed, but users preferences need to be learned to offer contextualized and personalized services, products or information. Therefore, this paper proposes an agent-based architecture for context-aware and personalized event recommendation based on ontology and the spreading algorithm. The use of ontology allows to define the domain knowledge model, while the spreading activation algorithm learns user patterns by discovering user interests. The proposed agent-based architecture was validated with the modeling and implementation of eAgora? application, which was illustrated at the pervasive university context.     

基于本体的数字图书馆个性化用户模型表示

本文针对当前个性化服务中基于关键词的用户兴趣表示方法在语义上的不足,结合本体语义信息丰富的特点,提出了一种基于本体的用户模型表示方法。在数字图书馆领域内,介绍了本体形式化描述并构建了数字图书馆领域本体,给出了用户模型的表示方法。并以个性化信息检索为例,说明了利用用户兴趣本体表示中的同义,上下位等关系给用户提供服务的方法。实验表明基于本体的表示方法能够给用户提供更加个性化的信息。     

Question answering based on pervasive agent ontology and Semantic Web

Semantic Web technologies bring new benefits to knowledge-based question answering system. Especially, ontology is becoming the pivotal methodology to represent domain-specific conceptual knowledge in order to promote the semantic capability of a QA system. In this paper we present a QA system in which the domain knowledge is represented by means of ontology. In addition, personalized services are enabled through modeling users’ profiles in the form of pervasive agent ontology, and a Chinese Natural Language human–machine interface is implemented mainly through a NL parser in this system. An initial evaluation result shows the feasibility to build such a semantic QA system based on pervasive agent ontology, the effectivity of personalized semantic QA, the extensibility of pervasive agent ontology and knowledge base, and the possibility of self-produced knowledge-based on semantic relations in the pervasive agent ontology.     

A personalized query expansion approach for engineering document retrieval

Engineers create engineering documents with their own terminologies, and want to search existing engineering documents quickly and accurately during a product development process. Keyword-based search methods have been widely used due to their ease of use, but their search accuracy has been often problematic because of the semantic ambiguity of terminologies in engineering documents and queries. The semantic ambiguity can be alleviated by using a domain ontology. Also, if queries are expanded to incorporate the engineer’s personalized information needs, the accuracy of the search result would be improved. Therefore, we propose a framework to search engineering documents with less semantic ambiguity and more focus on each engineer’s personalized information needs. The framework includes four processes: (1) developing a domain ontology, (2) indexing engineering documents, (3) learning user profiles, and (4) performing personalized query expansion and retrieval. A domain ontology is developed based on product structure information and engineering documents. Using the domain ontology, terminologies in documents are disambiguated and indexed. Also, a user profile is generated from the domain ontology. By user profile learning, user’s interests are captured from the relevant documents. During a personalized query expansion process, the learned user profile is used to reflect user’s interests. Simultaneously, user’s searching intent, which is implicitly inferred from the user’s task context, is also considered. To retrieve relevant documents, an expanded query in which both user’s interests and intents are reflected is then matched against the document collection. The experimental results show that the proposed approach can substantially outperform both the keyword-based approach and the existing query expansion method in retrieving engineering documents. Reflecting a user’s information needs precisely has been identified to be the most important factor underlying this notable improvement.     

User Modeling for Personalized City Tours

Several current support systems for travel and tourism are aimed at providing information in a personalized manner, taking users' interests and preferences into account. In this vein, personalized systems observe users' behavior and, based thereon, make generalizations and predictions about them. This article describes a user modeling server that offers services to personalized systems with regard to the analysis of user actions, the representation of assumptions about the user, and the inference of additional assumptions based on domain knowledge and characteristics of similar users. The system is open and compliant with major standards, allowing it to be easily accessed by clients that need personalization services.     

个性化检索中的用户ontology及其构建

为使用户能够从信息庞杂的网络中方便准确地找到自己所需的信息，在传统检索技术的基础上，结合ontology及个性化检索技术的研究，提出个性化检索中用户ontology的概念，讨论了基于行为的用户描述文件的建立，并制定了个性化检索中语义关系的提取规则。最后在此基础上给出了用户ontology的构建方法，并通过比较实验说明了用户ontology在个性化检索中的有效性。     

基于本体的e-Learning环境个性化服务处理方法*

为了向e-Learning环境中的学习者提供符合其个性化需求的学习服务,结合本体论具有概念和关系定义明确的特性,提出了e-Learning环境中学习者的个性化情形本体模型和相应的学习者个性化服务处理方法,该方法综合考虑了学习者的认知状态和学习偏好,进行个性化的答疑和进一步学习的内容推荐。采用该方法实现的原型系统实验表明,可使学习者的学习更有针对性,可更及时有效地消解疑惑,从而提高了学习者的学习效果和效率。     

面向Web日志的语义聚类算法*

由于现有的Web日志缺少明显语义,提出一种语义Web日志模型--SWLM,并给出基于该模型的网页和用户聚类算法.通过日志概念的语义距离定量计算来聚类网页和用户,奠定了Web个性化服务的基础.性能测试实验证明,该模型具有较好的整体性能,能有效地进行网页和用户聚类.     

Inferring user interests in microblogging social networks: a survey

With the growing popularity of microblogging services such as Twitter in recent years, an increasing number of users are using these services in their daily lives. The huge volume of information generated by users raises new opportunities in various applications and areas. Inferring user interests plays a significant role in providing personalized recommendations on microblogging services, and also on third-party applications providing social logins via these services, especially in cold-start situations. In this survey, we review user modeling strategies with respect to inferring user interests from previous studies. To this end, we focus on four dimensions of inferring user interest profiles: (1) data collection, (2) representation of user interest profiles, (3) construction and enhancement of user interest profiles, and (4) the evaluation of the constructed profiles. Through this survey, we aim to provide an overview of state-of-the-art user modeling strategies for inferring user interest profiles on microblogging social networks with respect to the four dimensions. For each dimension, we review and summarize previous studies based on specified criteria. Finally, we discuss some challenges and opportunities for future work in this research domain.     

A Personalized Information Dissemination System Based on How—Net

The information dissemination model is becoming increasingly important in wide-area information systems,In this model,a user subscribes to an information dissemination service by submitting profiles that describe his interests.There have been several simple kinds of information dissemination services on the Internet such as mailing list,but the problem is that it provides a crude granularity of interest matching.A user whose information need does not exactly match certain lists will either receive too many irrelevant or too few relevant messages.This paper presents a personalized information dissemination model based on HowNet,which uses a Concept Network-Views(CN-V) model to support information filtering,user‘s interests modeling and information recommendation.A Concept Network is constructed upon the user‘s profiles and the content of documents,which describes concepts and their relations in the content and assigns different weights to these concepts.Usually the Concept Network is not well arranged,from which it is hard to find some useful realtions.so several views from are extracted it to represent the important relations explicitly.     

Keyword clustering for user interest profiling refinement within paper recommender systems

To refine user interest profiling, this paper focuses on extending scientific subject ontology via keyword clustering and on improving the accuracy and effectiveness of recommendation of the electronic academic publications in online services. A clustering approach is proposed for domain keywords for the purpose of the subject ontology extension. Based on the keyword clusters, the construction of user interest profiles is presented on a rather fine granularity level. In the construction of user interest profiles, we apply two types of interest profiles: explicit profiles and implicit profiles. The explicit profiles are obtained by relating users’ interest-topic relevance factors to users’ interest measurements of these topics computed by a conventional ontology-based method, and the implicit profiles are acquired on the basis of the correlative relationships among the topic nodes in topic network graphs. Three experiments are conducted which reveal that the uses of the subject ontology extension approach as well as the two types of interest profiles satisfyingly contribute to an improvement in the accuracy of recommendation.     

CILIOS: Connectionist inductive learning and inter-ontology similarities for recommending information agents

For a software information agent, operating on behalf of a human owner and belonging to a community of agents, the choice of communicating or not with another agent becomes a decision to take, since communication generally implies a cost. Since these agents often operate as recommender systems, on the basis of dynamic recognition of their human owners’ behaviour and by generally using hybrid machine learning techniques, three main necessities arise in their design, namely (i) providing the agent with an internal representation of both interests and behaviour of its owner, usually called ontology; (ii) detecting inter-ontology properties that can help an agent to choose the most promising agents to be contacted for knowledge-sharing purposes; (iii) semi-automatically constructing the agent ontology, by simply observing the behaviour of the user supported by the agent, leaving to the user only the task of defining concepts and categories of interest. We present a complete MAS architecture, called connectionist learning and inter-ontology similarities (CILIOS), for supporting agent mutual monitoring, trying to cover all the issues above. CILIOS exploits an ontology model able to represent concepts, concept collections, functions and causal implications among events in a multi-agent environment; moreover, it uses a mechanism capable of inducing logical rules representing agent behaviour in the ontology by means of a connectionist ontology representation, based on neural-symbolic networks, i.e., networks whose input and output nodes are associated with logic variables.     

基于本体的个性化信息检索研究

分析传统的信息检索系统存在的不足及其原因,将本体加入到检索系统中,提出一个基于本体的个性化信息系统的设计思路和系统模型,并对该模型的主要模块进行了介绍,探讨了利用本体的领域知识和用户的本体模型实现信息检索的过程．最后对该模型进行的性能评价表明在查全率和查准率方面都有很大改善。     

Semantic relation based personalized ranking approach for engineering document retrieval

Since engineering design is heavily informational, engineers want to retrieve existing engineering documents accurately during the product development process. However, engineers have difficulties searching for documents because of low retrieval accuracy. One of the reasons for this is the limitation of existing document ranking approaches, in which relationships between terms in documents are not considered to assess the relevance of the retrieved documents. Therefore, we propose a new ranking approach that provides more correct evaluation of document relevance to a given query. Our approach exploits domain ontology to consider relationships among terms in the relevance scoring process. Based on domain ontology, the semantics of a document are represented by a graph (called Document Semantic Network) and, then, proposed relation-based weighting schemes are used to evaluate the graph to calculate the document relevance score. In our ranking approach, user interests and searching intent are also considered in order to provide personalized services. The experimental results show that the proposed approach outperforms existing ranking approaches. A precisely represented semantics of a document as a graph and multiple relation-based weighting schemes are important factors underlying the notable improvement.     

基于本体的个性化信息检索研究

分析传统的信息检索系统存在的不足及其原因,将本体加入到检索系统中,提出一个基于本体的个性化信息系统的设计思路和系统模型,并对该模型的主要模块进行了介绍,探讨了利用本体的领域知识和用户的本体模型实现信息检索的过程,最后对该模型进行的性能评价表明在查全率和查准率方面都有很大改善。     

基于多特征表示的本体概念挂载

该文研究了一种基于多特征表示的本体概念挂载方法。以中国大百科知识体系作为本体体系结构,抽取网络知识库条目作为本体概念,通过分析条目中文本内容、语义标签和半结构化信息获得本体概念间层级关系。该文将中国大百科知识体系扩展为百万级概念的多领域中文本体,为进一步抽取本体概念的属性、概念之间的非层级关系以及支持问答服务等应用建立了良好的基础。实验证明该方法相对于单一特征方法能够提高11.8%的挂载精度。     

Implementing adaptive mobile GI services based on ontologies: Examples from pedestrian navigation support

As we are facing the dawn of ubiquitous computing (UbiComp) by emerging mobile devices and distributed applications, personalization is leaving the desktop domain, because adaptation and context-awareness play a major role in UbiComp in order to realize the user friendliness postulated for UbiComp applications. Adaptation is a relatively new concept for GI services. Therefore we introduce the related research areas. The two most important factors for adaptation are (a) context as the representation of the current situation and (b) the user itself. In particular how to dynamically derive information on the users’ properties is a research area applying learning strategies introduced shortly. We see these two concepts not isolated but propose an integrated situation model including several types of context as well as user parameters. After this introduction we present several approaches to realizing adaptive mobile GI services in the domain of pedestrian navigation and tourist information – representing first steps towards UbiGIS (www.ubigis.org). These include context and user-aware proactive tips, personalized tour planning and adaptive maps. Implementations and new concepts for extensions of these are presented. The paper closes by an outlook on open research issues related to adaptive GI services.     

一种基于本体论的Internet信息个性化检索系统的Agent实现模型

本文通过结合本体论和Agent技术提出了一种基于本体论的Internet信息个性化检索的Agent系统的实现模式。该系统的实现可以在一定程度上缓解Internet网上信息过载的问题，结合领域知识，提供用户个性化信息检索服务，可提高Internet信息检索的准确率.     

基于领域本体的用户模型的研究*

目前大多数知识管理系统采用基于关键词或关键词向量空间模型表示用户的兴趣偏好。针对该方法不包含语义信息,很难准确表示用户感兴趣的信息,并且难于扩展,提出一种基于领域本体的用户模型。该模型利用用户访问量,采用改进的相似度算法,实现用户分类建立用户模型,体现用户个人偏好。最后将该模型应用于齐齐哈尔货车快速设计系统中,应用表明该模型能准确地反映用户兴趣,且提高了信息检索效率。