This paper concerns two-hop communication over relay-assisted Block fading channel. It is assumed there is not a direct link between the transmitter and the affiliated destination and the communication occurs in two hops through the use of a relay, where the amplify and forward (AF) strategy is employed at this node. In this case, in a Rayleigh block fading channel, the optimal weight function ...

Context-aware systems incorporate multimodal information to analyze contextual information in users’ environment and provide various proactive services according to dynamic context. In this paper, a novel online context analysis framework is proposed to support context-aware computing in smart meeting room. A novel dynamic context model is presented to model human group interactions. Robust aud...

Existing thermal-aware 3D placement methods assume that the temperature of 3D ICs can be optimized by properly distributing the power dissipations, and ignoring the heat conductivity of though-silicon-vias (TSVs). However, our study indicates that this is not exactly correct. While considering the thermal effect of TSVs during placement appears to be quite complicated, we are able to prove that...

We all know Pythagoras did quite a lot for high school mathematics; most of us are aware that his "Theorem" is also the basis for trigonometry, and trigonometry is the theoretical background to that most fundamental of sound waves, the sine wave. But that is not even scratching the surface of the work of the Pythagorean School. The man himself, and his own ideas, are only known to us through th...

Many current context-aware systems only react to the current situation and context changes as the occur. In order to anticipate to future situations and exhibit proactive behavior, these systems should also be aware of their future context. Since predicted context is uncertain and can be wrong, applications need to be able to assess the quality of the predicted context information. This allows ...

Context-aware systems use sensors in order to analyse their environment and to adapt their behaviour. We have designed and developed Sens-ation, an open and generic service-oriented platform, which provides powerful, yet easy-to-use, tools to software developers who want to develop context-aware, sensor-based infrastructures. The service-oriented paradigm of Sens-ation enables standardised comm...

We are concerned with the problem of defining a complex, hybrid, agent based discrete system in a modular way. The modularity results from looking at the system from a number of different perspectives, each dealing with a specific aspect of the system. As a solution a synchronization operator is proposed which glues agent aware systems on shared agents and transitions. The construction turns ou...

Context-aware systems adapt their behaviour based on the context a user is in. Since context is potentially privacy sensitive information, users should be empowered to control how much of their context they are willing to share, under what conditions and for what purpose. We propose an interactive consent mechanism that allows this. It is interactive in the sense that users are asked for consen...

Many context-aware systems have been demonstrated in lab environments; however, due to some difficulties such as the scalability and privacy issues, they are not yet practical for deployment on a large scale. This paper addresses these two issues with particular interest in user’s privacy protection and spontaneous system association. A person-centric service infrastructure is proposed together...

In this paper, the event concept is applied to support the interaction between mobile users and distributed location-aware systems. Taking a number of examples, the components of an event specification language are derived that can be used beyond the domain of location-aware systems.