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Feedback-based Cooperative Content Distribution for Mobile Networks

A feedback-based scheme for cooperative content distribu- tion for mobile systems aimed at reducing energy and li- censed spectrum usage is presented. The paper is motivated by the problems in implementing peer-to-peer based content distribution in mobile networks due to the risks of unfair en- ergy expenditure. A technique for incentivizing cooperation and for enforcing agreements between peers i

Vertical temperature increase in multi-storey buildings

Indoor temperature is by measurements stated to rise 0.1 – 0.2°C per storey upwards in multi-storey buildings, despite occupants’ possibility to control the temperature. Due to upward air temperature gradient in rooms there will be a heat transfer through slabs upwards. The size of this depends on insulation degree of building envelope and slabs and air flow through the building. With a linear mat

Better Support for User Participation using Business Rules Approach?

User participation in requirement analysis (RA) is necessary for IS quality and user acceptance. A prerequisite for meaningful user participation is that the coming users also understand the requirements. This understanding is made difficult by abstract and “technical” modelling languages and notations which require learning and experience. The Business Rules Approach (BRA) builds on a notion of B

Causality theorems and Green functions for transient wave propagation problems in stratified complex media

A general mixed initial-boundary value problem for a non-local hyperbolic equation, relevant for the study of the propagation of transient electro-magnetic waves in flat slabs, consisting of dispersive stratified complex media, and excited by incident plane waves, is treated. Theorems regarding unique solvability and causality are presented and proved by a time domain method similar to the one use