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1.
叙述了在手持移动计算设备上的基于上下文感知的多通道交互模型、多通道汉字输入、移动计算中的小屏幕网络浏览策略等方面的研究成果。实现了一个智能导游系统TGH,对这些模型和方法进行了应用和测试。最后总结了手持移动计算中人机交互技术研究的一些结论。  相似文献   

2.
上下文感知是普适计算的核心技术之一,而描述和理解上下文信息是上下文感知的前提。由于上下文信息种类繁多、感知方式迥异,目前开发面向特定应用的上下文感知系统缺乏统一的机制和通用的架构,增加了系统开发的成本。引入语义Web技术,利用本体对上下文信息进行建模,采用本体描述语言描述上下文模型,提供了一个公共的上下文本体以实现多个独立开发的上下文感知系统对知识的共享和推理,构建了通用的上下文感知中间件框架,从而实现对域内上下文知识的共同理解。  相似文献   

3.
基于本体的上下文感知中间件框架   总被引:2,自引:1,他引:1  
上下文感知是普适计算的核心技术之一,而描述和理解上下文信息是上下文感知的前提.由于上下文信息种类繁多、感知方式迥异,目前开发面向特定应用的上下文感知系统缺乏统一的机制和通用的架构,增加了系统开发的成本.引入语义Web技术,利用本体对上下文信息进行建模,采用本体描述语言描述上下文模型,提供了一个公共的上下文本体以实现多个独立开发的上下文感知系统对知识的共享和推理,构建了通用的上下文感知中间件框架,从而实现对域内上下文知识的共同理解.  相似文献   

4.
针对Smart Home环境的复杂性问题,提出了利用上下文技术来提高其智能化的方法.阐述了在普适环境下的上下文在智能家居环境中的重要性,介绍了上下文和上下文感知计算的定义,采用了基元组的形式定义了不同的上下文信息;提出了基于上下文感知的Smart Home系统模型,并对其功能进行了详细的描述;在Smart Home系统中,应用该模型对具体的上下文实例进行了描述和推理.  相似文献   

5.
SCoAC:一个面向服务计算的访问控制模型   总被引:1,自引:0,他引:1  
曹春  马晓星  吕建 《计算机学报》2006,29(7):1209-1216
提出了一个面向服务计算的访问控制模型SCoAC.在该模型中服务实体间的交互被看作是双方平等地服务于应用系统,通过环境中各实体间关系的描述,表达了服务间以所在管理域间信任关系为基础、以所处应用上下文为依据的授权关系,并通过引入“绑定上下文”匹配机制为细粒度策略的实施提供了支持.面向服务的应用系统的动态变化在模型中得以表达,并直接反映到服务间的授权关系之上.  相似文献   

6.
基于上下文感知的动态信任计算模型   总被引:1,自引:0,他引:1  
上下文环境对于信任的计算是非常重要的,但在现有模型中常常被忽略,根据P2P网络的特点,提出了一个基于上下文感知的动态自适应信任计算模型,在模型中,直接信任度是采用基于贝叶斯评估方法,推荐信任度是基于直接信任度,结合自身信任经验进行计算的,给出了信任度的综合评估计算模型.仿真结果表明,在交互决策时显示出模型的优越性和健壮性.  相似文献   

7.
基于描述逻辑的上下文知识获取与推理方法   总被引:1,自引:0,他引:1  
针对上下文感知计算中缺乏清晰统一的模型与自动推理支持的问题,提出一种基于描述逻辑的上下文知识获取与推理方法。该方法首先提出了一种本体引导的上下文模型框架,根据抽象层次的不同将上下文模型分为元模型与领域特定模型两层结构;然后采用描述逻辑表示语言SHOIN(D)形式化描述该上下文模型,设计上下文模型向描述逻辑知识库的转换算法。最后以一个实际案例说明该方法的可行性。  相似文献   

8.
基于上下文推理的指挥所业务交互研究   总被引:1,自引:0,他引:1       下载免费PDF全文
基于指挥所操作业务的应用需求,定义适用于指挥所中人机交互的上下文信息。在选取该上下文信息的过程中,利用OWL语言完成指挥所业务上下文描述,建立交互信息上下文感知模型。运用SWRL逻辑规则对交互信息上下文进行推理,获得业务交互过程中高层上下文语义后进行自适应调整。以一个师指挥所作战指挥业务想定为例,说明计算机通过用户交互位置和上级指令上下文信息进行调整,从而满足当前用户的交互位置和交互业务。  相似文献   

9.
网络环境中的三维交互技术应用广泛,但目前存在数据量大和带宽有限的矛盾,无法满足交互的实时性要求。以用户兴趣和网络状态为出发点,在三维场景传输策略中引入上下文感知计算,实现系统对用户意图的自动感知和相关数据的预传输,充分利用网络的空闲带宽,达到缩短响应时间的目的,并在人体经络系统中的验证了传输策略的有效性。  相似文献   

10.
一种面向上下文感知计算的建模方法   总被引:1,自引:0,他引:1  
上下文感知计算是指系统能发现并有效利用上下文信息(如用户位置,时间,环境参数,邻近的设备和人员,用户活动等)进行计算的一种计算模式。通常来说,上下文感知计算系统都是复杂的大规模分布式混合系统,如何对其有效建模是研究中的一个重要问题。本文提出一种基于Ptolemy Ⅱ的上下文感知计算建模方法。通过将FSM与层次化建模相结合减少FSM的状态数目,然后扩展FSM中状态,使其能执行预先定义的脚本或被再次建模。该建模方法能有效地支持上下文感知计算系统建模及快速原型构建。  相似文献   

11.
在普适计算中,上下文持续快速变化,上下文感知的应用根据上下文变化自动调整自身的行为以适应这种变化。然而,由于不可预测的环境噪声和动态变化等诸多因素的影响,很容易造成上下文不一致。非一致上下文会导致应用异常,甚至失败。为了解决这个问题,提出了一种自动修复上下文的新技术。它分为两个阶段:生成抽象修复用例;执行用例,以验证上下文不一致性是否已经修复。从用户的实际需要出发,生成的修复用例可以分别满足完整性或正确性。实验结果表明,这种技术在修复成功率上远远超过其他技术。  相似文献   

12.
Contextual patterns in mobile service usage   总被引:3,自引:1,他引:2  
Mobile services differ from other services because of their temporal and spatial attributes. Mobile services additionally differ from each other in their value-added to the end-user. Some services—such as emailing and voice—are more business oriented. On the other hand, various free-time oriented services are provided in new smartphones, such as imaging and music playback. The present paper studies how mobile services are used in different contexts. For this, the paper develops a specialized algorithm that can be used with handset-based usage data acquired straight from end-users in an established panel study process. Educated guesses can be drawn on the user context based on the developed algorithm. In the present exercise usage contexts were divided into home, office and “on the move”. The algorithm is used with exemplary data from Finland and the UK covering 324 consumers in 2006. More than 70% of contextual use cases are correctly classified based on raw data. According to exemplary results particularly multimedia services are used “on the move”, whereas legacy mobile services experience more evenly distributed usage across all contexts. The algorithm that identifies context based on raw data provides a new angle to mobile end-user research. In the future, the accuracy of the algorithm will be improved with the integration of seamless cell-id logging and GPS data.  相似文献   

13.
在普适计算环境下,由于所获得上下文信息的不一致性,往往会导致应用不一致性的产生。针对上下文不一致性的消除问题,提出了全丢弃消除算法、最新上下文丢弃算法、基于确定性上下文丢弃算法和基于相关性的上下文丢弃算法,并对算法的性能进行了比较和分析。实验表明,这些算法能够有效达到消除上下文不一致性的目的。  相似文献   

14.
Most existing context reasoning approaches implicitly assume that contexts are precise and complete. This assumption cannot be held in pervasive computing environments, where contexts are often imprecise and incomplete due to unreliable connectivity, user mobility and resource constraints. To this end, we propose an approach called CRET: Context Reasoning using extended Evidence Theory. CRET applies the evidence theory to context reasoning in pervasive computing environments. Because evidence theory is limited by two fundamental problems–computation-intensiveness and Zadeh paradox, CRET presents evidence selection and conflict resolution strategies. Empirical study shows that CRET is desirable for pervasive applications.  相似文献   

15.
Understanding mobile contexts   总被引:2,自引:2,他引:0  
Mobile urban environments present a challenge for context-aware computers because they differ from fixed indoor contexts such as offices, meeting rooms, and lecture halls in many important ways. Internal factors such as tasks and goals are different—external factors such as social resources are dynamic and unpredictable. An empirical, user-centred approach is needed to understand mobile contexts. In this paper, we present insights from an ethnomethodologically inspired study of 25 adult urbanites in Helsinki. The results describe typical phenomena in mobility: how situational and planned acts intermesh in navigation, how people construct personal and group spaces, and how temporal tensions develop and dissolve. Furthermore, we provide examples of social solutions to navigation problems, examine mobile multitasking, and consider design implications for mobile and context-aware human–computer interaction.
Sakari TamminenEmail: Phone: +358-9-4516042
  相似文献   

16.
在普适计算环境中,上下文信息由于受到噪声等不可控因素的干扰,面临着一致性错误的问题。这些错误会影响应用的正常运行,使其表现异常甚至失效。目前已经有自动的一致性错误处理方法来保障应用所获取的上下文满足数据层面的一致性约束,然而在数据层面保持一致是否能提升应用的运行质量并不明确。系统地研究了这个问题,并基于一组真实的上下文感知机器人小车应用,设计了一系列受控实验,来分析和比较在模拟和真实世界中上下文一致性错误的处理方式对应用运行质量的改善程度及潜在的负面影响。利用该实验的分析结果,将有助于提高普适计算中上下文感知应用的运行质量。  相似文献   

17.
傅城  尤晋元 《软件学报》2005,16(5):979-990
在移动资源演算(MR)中发现了一种干扰现象,称为直接访问干扰,该现象比移动灰箱演算(MA)中的墙干扰现象更具破坏力,因为在MR中恶意的环境或上下文可以不受限制地访问进程内部的敏感资源.因而该干扰问题当被视为一种程序运行错误.为了控制直接干扰现象,提出了一种MR的变体:安全移动资源演算(SR).它使用了一种类型系统来避免所有的直接访问干扰的发生.基于该研究,MA中的强干扰现象实际上是直接访问干扰的一种特殊形式,自然地,在SR中也得到了相应的控制.最后给出一些用例,说明如何使用新设计的演算系统,以及它的健壮性.  相似文献   

18.
In reconfigurable system, fast reconfiguration and small size of configuration contexts are strongly required to enhance the processing performance and reduce the implementation overhead. In this paper, a hierarchical representation of contexts for CGRA called HCC is proposed to satisfy the above requirements. In HCC, the contexts are constructed in a hierarchical fashion to thoroughly eliminate the repetitive portions of the contexts, not only reducing the overall contexts storage size, but also alleviating the contexts transportation overhead. The fast context-indexing mechanism is proposed in HCC to achieve high configuration speed, since the hierarchically organized contexts can be located and accessed conveniently. HCC has been verified in a reconfigurable processor called REMUS_HP. Owing to HCC, when implementing H.264 decoding on REMUS_HP, 76.67% of the overall contexts are reduced compared with the traditional non-hierarchical one; and the configuration speed is averagely 23× increased compared with the latest reported optimized configuration mechanism on Virtex-4 FX60. REMUS_HP is implemented on a 48.9 mm^2 silicon with TSMC 65 nm technology. Simulation shows that 1920 ×1088@30 fps could be achieved for H.264 high-profile decoding when exploiting a 200 MHz working frequency. Compared with the high performance version of XPP, the performance is 181% boosted.  相似文献   

19.
There is more to context than location   总被引:1,自引:0,他引:1  
Context is a key issue in interaction between human and computer, describing the surrounding facts that add meaning. In mobile computing location is usually used to approximate context and to implement context-aware applications. We propose that ultra-mobile computing, characterized by devices that are operational and operated while on the move (e.g. PDAs, mobile phones, wearable computers), can significantly benefit from a wider notion of context. To structure the field we introduce a working model for context, discuss mechanisms to acquire context beyond location, and application of context-awareness in ultra-mobile computing. We investigate the utility of sensors for context-awareness and present two prototypical implementations — a light-sensitive display and an orientation-aware PDA interface. The concept is then extended to a model for sensor fusion to enable more sophisticated context recognition. Based on an implementation of the model an experiment is described and the feasibility of the approach is demonstrated. Further, we explore fusion of sensors for acquisition of information on more sophisticated contexts.  相似文献   

20.
Wireless and mobile technologies to enhance teaching and learning   总被引:1,自引:0,他引:1  
Abstract This research aims to build a Wireless Technology Enhanced Classroom (WiTEC) that supports everyday activities unobtrusively and seamlessly in classroom contexts. This paper describes the integration of wireless LAN, wireless mobile learning devices, an electronic whiteboard, an interactive classroom server, and a resource and class management server to build the WiTEC. This contains a number of features that can support class members in various types of teaching and learning activities. Project-based learning is taken as a scenario to elaborate how teachers and students can engage in teaching and learning via WiTEC. Finally, a number of suggestions are discussed for further study.  相似文献   

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