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Vehicular traffic density is a key factor in determining the behaviour of radio overlapping and thus impacts performance of data and safety message communication in Vehicular Ad hoc Networks (VANETs). In this paper, we propose a novel density model for urban traffic systems and employ this model for the purpose of spatial-temporal analysis of radio overlapping. To model traffic density, we conside

Popular Abstract in Swedish Lysande plast, finns det? Tanken är att att tunn plast-film skall kunna användas som ihoprullbara tunna TV- och datorskärmar, som lysdioder, som mottagare i solceller och som transistorer. Till vardags är förmodligen den vanligaste uppfattningen att plast är ett isolerande material som inte leder ström och som därför heller inte lyser. Faktum är att bara en del av plasTransient absorption laser spectroscopy and resonance Raman spectrscopy have been used to study conjugated polymers and oligomers. To extract more information the measurements have been compared to computer simulations and calculations. In order to obtain a better understanding of the role of conformational disorder in the photophysics of light-emitting, conjugated polymers the ultrafast transient

Popular Abstract in Swedish Omkring hälften av alla kvinnor kommer någon gång efter 50 års ålder att drabbas av ett benbrott. Ett benbrott ger upphov till smärta, en risk för långvarig invaliditet och förtida död. Det är viktigt att försöka hitta dem som riskerar att drabbas, eftersom det möjliggör förebyggande behandling. Hur stor risken är att man drabbas av ett benbrott på äldre dagar beror fraApproximately half of all women will sustain a fracture after the age of 50. Fractures may cause long-term disability and excess mortality. Identifying individuals at high risk of sustaining a fracture is important in the development of primary and secondary prevention strategies. In this study, initiated to identify factors associated with a high risk of future fractures, 1 044 women, all 75 yea

We study and solve the previously unstudied problem of finding both sender and receiver positions from time of arrival (TOA) measurements when there is a difference in dimensionality between the affine subspaces spanned by receivers and senders. Anchor-free TOA network calibration has uses both in sound, radio and radio strength applications. Using linear techniques and requiring only a minimal nu

In Western classical music traditions, conventional ways of considering melody have been established. The tones of a melody phrase might be experienced as building up a continuous line moving between dynamical culmination points and relaxation points. In this study, a special visual tool called the Melody phrasing curve (MPhC) has been tested. The MPhC is designed according to some established con

Long-term instability in multiplanet exosystems is a crucial consideration when confirming putative candidates, analysing exoplanet populations, constraining the age of exosystems and identifying the sources of white dwarf pollution. Two planets that are Hill stable are separated by a wide-enough distance to ensure that they will never collide. However, Hill-stable planetary systems may eventually

Several serious problems such as material durability and fouling in the High Temperature Heat Exchanger (HTEH) for Externally Fired Micro Gas Turbines (EFMGT) cause the low thermal efficiency. In this study for increasing the thermal efficiency, a duct around a cylindrical fixed bed combustor which burns wood pellets is proposed and two different designs, empty and porous material filled, are inve

We describe an automatic system for pose-estimation from a single image in a city scene. Each building has a model consisting of a number of parallel planes associated with it. The homographies for the best match of the planes to the image is estimated automatically for each of the possible buildings. We show how the estimation of the homographies can be done effectively by reducing the search spa

Accident prediction models are often used to predict the number of accidents on segments and at intersections in the road network. Most often the models are developed for a total number of crashes for the facility, or crashes by severity. However, the frequency and severity of crashes of different types can be expected to vary with regards to the underlying phenomena that cause them to occur. To b

Ultra-wideband (UWB) communication is a potential technique for future high-speed networks. In this paper, we investigate low complexity signal detection approaches for OFDM based UWB systems. In particular, we develop practical approaches for channel estimation and interference suppression. Computer simulation results show that these techniques can be effectively used in OFDM based UWB systems fo