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A New Aware-Context Collaborative Filtering Approach by Applying Multivariate Logistic Regression Model into General User Pattern 被引量:1
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作者 Loc Nguyen 《Journal of Data Analysis and Information Processing》 2016年第3期124-131,共8页
Traditional collaborative filtering (CF) does not take into account contextual factors such as time, place, companion, environment, etc. which are useful information around users or relevant to recommender application... Traditional collaborative filtering (CF) does not take into account contextual factors such as time, place, companion, environment, etc. which are useful information around users or relevant to recommender application. So, recent aware-context CF takes advantages of such information in order to improve the quality of recommendation. There are three main aware-context approaches: contextual pre-filtering, contextual post-filtering and contextual modeling. Each approach has individual strong points and drawbacks but there is a requirement of steady and fast inference model which supports the aware-context recommendation process. This paper proposes a new approach which discovers multivariate logistic regression model by mining both traditional rating data and contextual data. Logistic model is optimal inference model in response to the binary question “whether or not a user prefers a list of recommendations with regard to contextual condition”. Consequently, such regression model is used as a filter to remove irrelevant items from recommendations. The final list is the best recommendations to be given to users under contextual information. Moreover the searching items space of logistic model is reduced to smaller set of items so-called general user pattern (GUP). GUP supports logistic model to be faster in real-time response. 展开更多
关键词 aware-context Collaborative Filtering Logistic Regression model
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Approach to Model-Based Development of Context-Aware Application
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作者 Imen Jaouadi Raoudha Ben Djemaa Hanene Ben Abdallah 《Journal of Computer and Communications》 2015年第5期212-219,共8页
In order to address challenges posed by advances in mobile computing, ubiquitous devices software engineering, wireless and sensor technologies in many applications running, this paper provides an approach that simpli... In order to address challenges posed by advances in mobile computing, ubiquitous devices software engineering, wireless and sensor technologies in many applications running, this paper provides an approach that simplifies the design and the implementation of context-aware Interactive systems called CAISDA (Context-Aware Interactive System Development Approach). This approach is based on the analysis and synthesis of context-aware frameworks proposed in literature. 展开更多
关键词 context-awarE model Based DEVELOPMENT RUNTIME ADAPTATION
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Mobile and Context-Aware GeoBI Applications: A Multilevel Model for Structuring and Sharing of Contextual Information
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作者 Belko Abdoul Aziz Diallo Thierry Badard +1 位作者 Frédéric Hubert Sylvie Daniel 《Journal of Geographic Information System》 2012年第5期425-443,共19页
With the requirements for high performance results in the today’s mobile, global, highly competitive, and technology-based business world, business professionals have to get supported by convenient mobile decision su... With the requirements for high performance results in the today’s mobile, global, highly competitive, and technology-based business world, business professionals have to get supported by convenient mobile decision support systems (DSS). To give an improved support to mobile business professionals, it is necessary to go further than just allowing a simple remote access to a Business Intelligence platform. In this paper, the need for actual context-aware mobile Geospatial Business Intelligence (GeoBI) systems that can help capture, filter, organize and structure the user mobile context is exposed and justified. Furthermore, since capturing, structuring, and modeling mobile contextual information is still a research issue, a wide inventory of existing research work on context and mobile context is provided. Then, step by step, we methodologically identify relevant contextual information to capture for mobility purposes as well as for BI needs, organize them into context-dimensions, and build a hierarchical mobile GeoBI context model which (1) is geo-spatial-extended, (2) fits with human perception of mobility, (3) takes into account the local context interactions and information-sharing with remote contexts, and (4) matches with the usual hierarchical aggregated structure of BI data. 展开更多
关键词 context-awareness Decision Support System (DSS) MOBILE GEOSPATIAL Business Intelligence (GeoBI) Decision-Making Relevant contextual Information context Dimensions context modeling context SHARING context STRUCTURING BI Data
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Context-Aware System Modeling Based on Boolean Control Network
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作者 M. Humayun Kabir M. Robiul Hoque 《Open Journal of Applied Sciences》 2015年第11期661-668,共8页
Boolean control network consists of a set of Boolean variables whose state is determined by other variables in the network. Boolean network is used for modeling complex system. In this paper, we have presented a model... Boolean control network consists of a set of Boolean variables whose state is determined by other variables in the network. Boolean network is used for modeling complex system. In this paper, we have presented a model of a context-aware system used in smart home based on Boolean control networks. This modeling describes the relationship between the context elements (person, time, location, and activity) and services (Morning Call, Sleeping, Guarding, Entertainment, and normal), which is effective to logical inference. We apply semi tensor matrix product to describe the dynamic of the system. This matrix form of expression is a convenient and reasonable way to design logic control system. 展开更多
关键词 MATHEMATICAL modeling context-awarE System Smart HOME BOOLEAN Control Network Semi-Tensor Matrix Product
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Context-Aware信息检索技术与模型 被引量:1
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作者 肖伟 全惠云 《计算机工程与应用》 CSCD 北大核心 2005年第35期169-172,共4页
Context-aware信息检索技术是一种具有自适应性和自组织性的智能信息检索技术,而且是富有挑战性的研究方向。文章首先叙述了与Context-aware相关的基本概念及实现的基本原理,接着介绍了基于不同Context信息的检索模型,并且讨论了各种模... Context-aware信息检索技术是一种具有自适应性和自组织性的智能信息检索技术,而且是富有挑战性的研究方向。文章首先叙述了与Context-aware相关的基本概念及实现的基本原理,接着介绍了基于不同Context信息的检索模型,并且讨论了各种模型的实现技术及适用范围。 展开更多
关键词 信息检索 contextaware 检索模型
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A Survey on Context-Aware Sensing for Body Sensor Networks 被引量:1
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作者 Barbara T. Korel Simon G. M. Koo 《Wireless Sensor Network》 2010年第8期571-583,共13页
Context awareness in Body Sensor Networks (BSNs) has the significance of associating physiological user activity and the environment to the sensed signals of the user. The context information derived from a BSN can be... Context awareness in Body Sensor Networks (BSNs) has the significance of associating physiological user activity and the environment to the sensed signals of the user. The context information derived from a BSN can be used in pervasive healthcare monitoring for relating importance to events and specifically for accurate episode detection. In this paper, we address the issue of context-aware sensing in BSNs, and survey different techniques for deducing context awareness. 展开更多
关键词 context awareness BODY Sensor NETWORKS Artificial Neural NETWORKS BAYESIAN NETWORKS Hidden MARKOV models
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A Semantic Model for Socially Aware Objects
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作者 Giulia Biamino 《Advances in Internet of Things》 2012年第3期47-55,共9页
The Internet of Things (IoT) assumes that things interact and exchange information thus defining the future of pervasive computing environments. The integration between people and interconnected objects realizes a new... The Internet of Things (IoT) assumes that things interact and exchange information thus defining the future of pervasive computing environments. The integration between people and interconnected objects realizes a new physical and social space and opens new frontiers in context awareness and objects adaptation. In this paper we investigate the possibility of creating socially aware objects able to interact not only among themselves but also with human beings sharing the same environment. The main contribution of this work is to provide a knowledge model for social context-awareness and reasoning using an ontology-based context modeling, a user model and exploiting of social networks. This model is part of a larger framework called So Smart that aims at empowering networks of interconnected objects with social context awareness in order to improve their social interaction with people. 展开更多
关键词 Social-context awareness Smart OBJECTS USER model SEMANTIC models SOCIAL Networks
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An OWL-Based Mobile GeoBI Context Ontology Enabling Location-Based and Context-Based Reasoning and Supporting Contextual Business Analysis
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作者 Belko Abdoul Aziz Diallo Thierry Badard +1 位作者 Frédéric Hubert Sylvie Daniel 《International Journal of Geosciences》 2015年第1期88-108,共21页
Mobile professionals need to be assisted with suitable mobile GeoBI (Geospatial Business Intelligence) systems, which are able to capture, organize and structure the user’s reality into a relevant context model and r... Mobile professionals need to be assisted with suitable mobile GeoBI (Geospatial Business Intelligence) systems, which are able to capture, organize and structure the user’s reality into a relevant context model and reason on it. GeoBI context modelling and reasoning are still research issues since there is not yet either a model or a relevant taxonomy regarding GeoBI contextual information. To fill this gap, this paper proposes an extended and detailed OWL-based mobile GeoBI context ontology to provide context-aware applications and users with relevant contextual information and context-based reasoning capabilities. Context quality issues are handled an implementation architecture which is provided. 展开更多
关键词 MOBILE GEOSPATIAL Business Intelligence (GeoBI) context modelling context ONTOLOGY context awareness context REASONING Location-Based REASONING
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A Work Service Model of the Ubiquitous Environment Collaboration
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《Journal of Civil Engineering and Architecture》 2012年第1期44-52,共9页
Office environments have recently adopted ubiquitous computing for collaboration and mobile communication to promote real-time enterprises. Ubiquitous offices, introduced by Weiser and adopted as emerging computationa... Office environments have recently adopted ubiquitous computing for collaboration and mobile communication to promote real-time enterprises. Ubiquitous offices, introduced by Weiser and adopted as emerging computational technology to support office works, have already affected the practice of companies and organizations. Within this context, this study deals with a work service model of the ubiquitous office environments by understanding human behaviors and works in their workspace. We propose a ubiquitous office model considering the correlation between ubiquitous computing technologies and work services in the office. Two attributes are emphasized, collaboration and mobility, as identifiers for categorizing the work types. The types of work services have variations in the amount of communication and the proportion of working outside of the office. The proposed work service model of the ubiquitous office includes territorial and non-territorial services to enable workers in and out of the office to interact with each other effectively. The findings in this paper would be a theoretical basis for embodying an intelligent office which supports office works efficiently. 展开更多
关键词 Ubiquitous office work service model ubiquitous computing context awareness collaboration.
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Context-Based Recommendation Approach for Measurement and Evaluation Projects
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作者 Hernan Molina Luis Olsina Gustavo Rossi 《Journal of Software Engineering and Applications》 2010年第12期1089-1106,共18页
Data, information and knowledge are recognized as useful assets for analysis, recommendation and decision making at any business level of an organization. Providing the right information for decision making considerin... Data, information and knowledge are recognized as useful assets for analysis, recommendation and decision making at any business level of an organization. Providing the right information for decision making considering different user-requirements, projects and situations is, however, a difficult issue. A frequently-neglected challenge is to cope with the influence of contextual issues affecting the success of outcomes and decisions. Particularly, when conducting quality evaluations in software organizations, it is of paramount importance to identify beforehand the contextual issues affecting outcomes and interpretations for measurement and evaluation projects. Therefore, the relevant context information should be clearly identified, specified and recorded for performing more robust analysis and recommendations. In this work, a domain-independent context model and a mechanism to integrate it to any application domain is presented. The context model is built upon a measurement and evaluation framework enabling quantification and semantic capabilities. The context model is then integrated in the mentioned framework itself to enable recommendations in meas- urement and evaluation projects. 展开更多
关键词 context-awarE context model RECOMMENDER System MEASUREMENT EVALUATION C-INCAMI Framework
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社交媒体虚假信息检测研究综述
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作者 陈静 周刚 +3 位作者 李顺航 郑嘉丽 卢记仓 郝耀辉 《计算机科学》 CSCD 北大核心 2024年第11期1-14,共14页
社交媒体上的虚假信息不仅危害网络空间安全,还在重大事件中扮演着关键角色,严重误导公众,对政治和社会秩序造成负面影响。为此,围绕面向社交媒体的虚假信息检测技术研究展开综述,为构建高效检测技术和遏制社交媒体虚假信息泛滥奠定理... 社交媒体上的虚假信息不仅危害网络空间安全,还在重大事件中扮演着关键角色,严重误导公众,对政治和社会秩序造成负面影响。为此,围绕面向社交媒体的虚假信息检测技术研究展开综述,为构建高效检测技术和遏制社交媒体虚假信息泛滥奠定理论基础。首先,深入剖析虚假信息的内涵本质,探讨其在社交平台上的产生机理、具体表现形式,并界定检测任务的基础框架与目标;其次,从语义一致性视角出发,专注内容语义、社交上下文感知和知识驱动三大层面,对比梳理典型检测方法;在此基础之上,深入探究增强检测算法可解释性最新研究成果;进一步,从对抗博弈视角,深度剖析当前社交媒体虚假信息检测任务面临的挑战以及大型语言模型为虚假信息检测技术研究带来的机遇;最后,对社交媒体虚假信息检测技术未来的发展进行了展望。 展开更多
关键词 虚假信息检测 跨模态关联 社交上下文感知 知识驱动 大语言模型
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基于条形卷积和上下文感知的近海水产养殖提取方法 被引量:1
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作者 吴婷 陈红梅 +1 位作者 罗冬莲 陈芸芝 《福州大学学报(自然科学版)》 CAS 北大核心 2024年第1期37-44,共8页
利用中等分辨率遥感影像,针对近海养殖区边界模糊、筏式和网箱养殖存在类间干扰等现象,以ResUnet模型为基础,提出一种带有条形卷积模块和上下文感知单元的MSUResUnet模型,以提高模型的特征提取能力,改善近海水产养殖提取任务中出现的漏... 利用中等分辨率遥感影像,针对近海养殖区边界模糊、筏式和网箱养殖存在类间干扰等现象,以ResUnet模型为基础,提出一种带有条形卷积模块和上下文感知单元的MSUResUnet模型,以提高模型的特征提取能力,改善近海水产养殖提取任务中出现的漏提和粘连等问题.模型中利用条形池化模块增强编码层与解码层信息的交互,引入条形卷积模块增强对水产养殖线性特征的捕捉能力,通过增加上下文感知单元获取水产养殖区丰富的多尺度上下文信息.在Sentinel-2 MSI数据上的实验结果表明,参与比对的6个模型中,MSUResUnet模型精度最优,其Kappa系数、 MIoU、 OA和F1分数分别达到了89.17%、 84.33%、 96.38%和91.19%;MSUResUnet在养殖较密集的兴化湾、三沙湾和罗源湾附近海域均获得较高精度,具有较强的特征提取和抗干扰能力,能够满足高精度的大范围中等分辨率影像近海水产养殖信息提取需求. 展开更多
关键词 筏式和网箱养殖 深度学习 ResUnet模型 多方向条形卷积 上下文感知单元
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基于交叉注意力多源数据增强的情境感知查询建议方法
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作者 张乃洲 曹薇 《北京大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第1期34-42,共9页
当前基于神经网络模型的查询建议研究往往单独采用查询日志会话中的查询序列作为训练数据,但由于查询本身缺乏句法关系,甚至缺失语义,导致神经网络模型不能充分挖掘和推理查询序列中各种词或概念之间语义关系。针对这一问题,提出一种基... 当前基于神经网络模型的查询建议研究往往单独采用查询日志会话中的查询序列作为训练数据,但由于查询本身缺乏句法关系,甚至缺失语义,导致神经网络模型不能充分挖掘和推理查询序列中各种词或概念之间语义关系。针对这一问题,提出一种基于交叉注意力多源数据增强(MDACA)的Transformer模型框架,用于生成情境感知的查询建议。采用基于Transformer的编码器-解码器模型,利用交叉注意力机制,融合了查询层、文档语义层以及全局查询建议信息。实验结果表明,与目前方法相比,该方法能生成具有更高相关性的情境感知查询建议。 展开更多
关键词 查询建议 数据增强 交叉注意力 情境感知 Transformer模型
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Reference model of future ubiquitous convergent network and context-aware telecommunication service platform 被引量:1
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作者 QIAO Xiu-quan LI Xiao-feng LIANG Shou-qing 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2006年第3期50-56,共7页
A reference model for future ubiquitous convergent network is analyzed. To provide user-centric, intelligent, personalized service, this article presents a context-aware telecommunication service platform (CaTSP) to... A reference model for future ubiquitous convergent network is analyzed. To provide user-centric, intelligent, personalized service, this article presents a context-aware telecommunication service platform (CaTSP) to adapt to dynamically changing context. This article focuses on the new design method of context-aware telecommunication service platform and its architecture. Through the use of model-driven architecture (MDA) and semantic web technologies, CaTSP can enable context reasoning and service personalization adaption. This article explores a new approach for service intelligence, personalization, and adaptability in the semantic web service computing era. 展开更多
关键词 ubiquitous convergent network context-aware telecommunication service platform ONTOLOGY OWL OWL-S model-driven architecture
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AocML: A Domain-Specific Language for Model-Driven Development of Activity-Oriented Context-Aware Applications
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作者 Xuan-Song Li Xian-Ping Tao +1 位作者 Wei Song Kai Dong 《Journal of Computer Science & Technology》 SCIE EI CSCD 2018年第5期900-917,共18页
Activity-oriented context-aware (AOCA) applications are representative in pervasive computing. These appli- cations recognize daily-life human activities, perceive the environment status related to the activities, a... Activity-oriented context-aware (AOCA) applications are representative in pervasive computing. These appli- cations recognize daily-life human activities, perceive the environment status related to the activities, and react to ensure the smooth performance of the activities. Existing research proposed a specific light-weight, incremental method to support the development of such applications; however it is not easy to learn and use. This paper aims to facilitate the development of such applications and improve the productivity of developers. We propose AocML, a textual domain-specific language which provides a high-level abstraction of AOCA applications. Specifically, we first show the software model of AOCA applications and the abstract syntax of AocML. Then, we introduce the concrete syntax of AocML. We also implement the tools for AocML, including the development environment as well as the generation of Java code and ontology specification. Moreover, we use a case study and evaluation to demonstrate the advantages of AocML. 展开更多
关键词 pervasive computing context-awareness model-driven development domain-specific language
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一种情境感知服务系统框架 被引量:41
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作者 莫同 李伟平 +1 位作者 吴中海 褚伟杰 《计算机学报》 EI CSCD 北大核心 2010年第11期2084-2092,共9页
根据感知的情境信息将业务服务组合成情境感知服务是提高服务水平的有效途径.现有研究多关注于情境信息及服务的表示,而对情境感知服务的构造特征和业务运行机制缺乏充分考虑.一方面,各情境感知服务的情境信息和业务服务重复性较强,通... 根据感知的情境信息将业务服务组合成情境感知服务是提高服务水平的有效途径.现有研究多关注于情境信息及服务的表示,而对情境感知服务的构造特征和业务运行机制缺乏充分考虑.一方面,各情境感知服务的情境信息和业务服务重复性较强,通过预定义流程的紧耦合构造方式难以支持重用;另一方面,情境信息取值变化具有随机性和动态性,基于推理的触发式调用执行代价过高.基于情境感知服务特征分析提出了一种情境感知服务系统框架CBS3,给出了情境信息与业务服务的配置模型和构造机制.通过社区老年情境感知服务的案例说明使用CBS3建立情境感知服务的过程.对比分析的结果表明,与传统方法相比,CBS3能够提高情境感知服务重用度和执行效率. 展开更多
关键词 情境信息 情境感知 情境感知服务 配置模型
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情境计算研究综述 被引量:20
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作者 李伟平 王武生 +3 位作者 莫同 张志超 褚伟杰 吴中海 《计算机研究与发展》 EI CSCD 北大核心 2015年第2期542-552,共11页
作为一种新的计算模式,情境计算得到了学术界和产业界越来越多的关注.随着物联网、云计算、大数据、社会计算等相关技术的不断发展成熟,情境计算进入了快速发展阶段.情境计算是一种通过对获取到的情境信息进行处理、从而得出用户所需服... 作为一种新的计算模式,情境计算得到了学术界和产业界越来越多的关注.随着物联网、云计算、大数据、社会计算等相关技术的不断发展成熟,情境计算进入了快速发展阶段.情境计算是一种通过对获取到的情境信息进行处理、从而得出用户所需服务并主动向用户提供相应情境感知服务的计算模式.这一新的计算模式为使用者的工作、生活带来了舒适和便利.对情境计算的诞生背景进行阐述,介绍情境、情境计算、情境感知、情境感知系统和情境感知服务等关键概念,总结情境数据获取、情境模型与建模、情境推理、主动服务提供、情境感知中间件和安全与隐私等重要研究内容以及其中使用到的关键技术,最后依托情境计算的一般性架构分析得出情境计算的未来发展挑战. 展开更多
关键词 情境计算 情境感知服务 情境建模 情境推理 服务提供
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情景感知的P2P移动社交网络构造及发现算法 被引量:24
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作者 曹怀虎 朱建明 +1 位作者 潘耘 李海峰 《计算机学报》 EI CSCD 北大核心 2012年第6期1223-1234,共12页
如何通过情景感知,获得用户的行为特征,从而自动发现潜在的社会关系,是移动社交网络重要的研究内容之一.该文提出了情景感知的移动P2P社交网络系统架构、聚合模型及发现算法,将用户的位置信息、环境特征、运动轨迹等引入到聚合算法中,... 如何通过情景感知,获得用户的行为特征,从而自动发现潜在的社会关系,是移动社交网络重要的研究内容之一.该文提出了情景感知的移动P2P社交网络系统架构、聚合模型及发现算法,将用户的位置信息、环境特征、运动轨迹等引入到聚合算法中,智能地聚合成潜在的P2P社交网络,根据用户需求自主发现匹配的社会关系,避免了社交活动的盲目性和随意性.最后对该方案和算法进行了理论分析及实验验证,结果表明该文所提出的方案和算法具有较高的响应速度、准确率及用户满意度. 展开更多
关键词 移动社交网络 情景感知 聚合模型 社交发现 P2P 移动互联网
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动态上下文知识的获取与共享 被引量:4
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作者 於志勇 周兴社 +3 位作者 王海鹏 倪红波 於志文 王柱 《计算机科学》 CSCD 北大核心 2009年第9期218-223,共6页
上下文感知系统需要获取和共享多种上下文知识,不仅包含环境参数的具体取值,也包含对环境状态描述时所用的词汇,也就是概念。上下文知识具有与生俱来的动态性,在设计时难以预知系统可能涉及的上下文信息。而大多数已有的系统缺乏完善的... 上下文感知系统需要获取和共享多种上下文知识,不仅包含环境参数的具体取值,也包含对环境状态描述时所用的词汇,也就是概念。上下文知识具有与生俱来的动态性,在设计时难以预知系统可能涉及的上下文信息。而大多数已有的系统缺乏完善的动态上下文知识维护机制,因此不支持上下文感知应用的运行时的扩展。提出一个基于本体的层次化上下文模型,以及基于此模型的动态上下文知识获取与共享框架(DCASI)。框架中按需分散获取机制让各类上下文知识出自最有资格定义它的实体,使得上下文知识充足而又不冗余;双库集中共享机制按共享的不同作用维护两个知识库,有效支持了新上下文知识的定义和发现。原型系统验证了本框架的有效性。 展开更多
关键词 上下文感知 动态上下文知识 上下文模型 上下文框架
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基于经验感知的自适应用户界面模型 被引量:11
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作者 樊银亭 滕东兴 +3 位作者 杨海燕 马翠霞 戴国忠 王宏安 《计算机学报》 EI CSCD 北大核心 2011年第11期2211-2223,共13页
针对传统自适应界面缺乏自主学习用户交互历史、难以根据用户经验有效预测用户意图的现状,基于认知心理学相关理论,该文提出了基于经验感知的自适应用户界面模型,从界面静态组成元素、动态交互行为和自适应策略三个方面建立了该模型的... 针对传统自适应界面缺乏自主学习用户交互历史、难以根据用户经验有效预测用户意图的现状,基于认知心理学相关理论,该文提出了基于经验感知的自适应用户界面模型,从界面静态组成元素、动态交互行为和自适应策略三个方面建立了该模型的统一描述,然后研究了自适应界面模型的实现架构、关键技术和建模方法.最后开发了一个个性化的虚拟家居定制原型系统,并进行了实验评估.实验结果表明,该模型能够根据用户交互历史和上下文环境,准确预测用户意图,实时调整界面布局和交互行为以主动地适应用户. 展开更多
关键词 用户经验 自适应用户界面 上下文感知 界面模型 人机交互
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