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This paper presents a system framework to support continuous nearest surrounder (NS) queries in moving object environments. NS query finds the nearest objects at individual distinct angles from a query point. This query distinguishes itself from other conventional spatial queries such as range queries and nearest neighbor queries by considering both distance and angular aspects of objects with respect...
Striking a balance between the public visibility of a display, and the ease with which individuals have access to information, is a key challenge for the developers of interfaces to pervasive services. In this paper we utilize the cognitive phenomenon of crossmodal attention as a means of providing users with personalized cues to content on public displays. We describe two prototype applications that...
In order to implement reactive and proactive functionalities in a pervasive environment, contextual data must be processed. One of the most important features of the context is the position of the users and the devices. In this paper, we describe a method to determine the position of a WiFi enabled device. The prediction is based on the signal strength of the available access points. The prediction...
Due to the large success of wireless networks and handheld devices, the pervasive computing paradigm is becoming a reality. One of the most challenging objectives to be achieved in pervasive computing environments is to assist users in realizing tasks anytime, anywhere, on the fly, by composing functionalities provided by the networked services of the pervasive computing environment. Towards this...
This paper suggests CM (community manager) as a dynamic and reflective collaboration solution which supports a seamless collaboration of services by adapting to the runtime environment. For the seamless and consistent collaboration service among the diverse middlewares, services and devices, service developers have to care about the latent complexity and troubles generated from integration into the...
Mobile users of future ubiquitous environments require novel means for locating relevant services available in their daily surroundings, where relevance has a user-specific definition. In this paper, we propose the hybrid service provisioning model which complements the traditional model of interaction service provider to consumer with peer-to-peer functionalities. In addition to being notified proactively...
Context-awareness is rarely considered in component-based middleware. In this paper, we present CAMidO, a context-aware middleware based on an ontology meta-model. CAMidO, enables designers to create component-based context-aware applications. It provides an ontology meta-model for context description. The described information are used by the middleware to automatically adapt the application to relevant...
We discuss the integration of two contemporary service technologies: Web services and mobile agents. We exploit the capabilities offered by mobile agents to query and invoke semantically enriched Web services without the need for simultaneous, online presence of the service requestor. Such service setting is ideal for wireless/mobile computing, where user terminals are not necessarily online during...
One of the grand challenges in agent technology research is quasi-automatic development of heterogeneous and dynamic multiagent systems using agent oriented software engineering (AOSE) tools. This paper presents an innovative approach to developing and supporting multiagent systems at run-time. Multiagent systems (MASs) can and should be generated dynamically based on high-level user specifications...
In this paper, on the basis of end-to-end principle, we propose a mobility management scheme to solve the NAT issue. Furthermore, since different communication technologies own different characteristics, during a vertical handoff, a well-behaved mobility management system should adapt an ongoing connection to different communication systems. In this paper, we also propose a handoff-aware TCP adaptation...
Mobile IPv6 provides support for multiple home agents on a single home link. This home link is single point of failure for mobile IPv6. Current specifications of mobile IPv6 does not provide solution to the home link failure problems. In this paper, we introduce "virtual home link" as an extension to mobile IPv6. It provides reliability and load balancing among the home links by introducing...
With an increasing diversity of pervasive computing devices integrated in our surroundings and increasing mobility of both users and hardware, it is important for computer systems and applications to be context-aware. Lots of works have already been done in this direction on how to capture context data and how to carry it to the application. Among the remaining challenges are to create the intelligence...
We propose a scalable service execution control method for a service that is triggered when the context satisfies an execution condition. We call such services context-dependent. A context-dependent service needs to monitor the context that affects the execution condition all the time. The proposed method tremendously reduces the cost of context monitoring operations while it surely executes appropriate...
Situation awareness is considered as an approach to model user context in ubiquitous information services. Such services can intelligently infer knowledge about user situation. Moreover, situational reasoning is attained taking into consideration similarity-based approaches. This paper proposes approximate decision making about situational similarity using conceptual modelling, ontological representation,...
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