The performance of an iris recognition system depends greatly on how well the iris segmentation part of the system performs its task. The performance of an iris segmenta- tion algorithm can be evaluated using different criteria and methods. Some of the methods evaluate the performance of the segmentation algorithm based on the performance of the whole iris recognition system. Other methods evaluat

A stability criterion for nonlinear systems, derived by the first author (2000), can be viewed as a dual to Lyapunov's second theorem. The criterion is stated in terms of a function which can be interpreted as the stationary density of a substance that is generated all over the state space and flows along the system trajectories towards the equilibrium. The new criterion has a remarkable convexity

Au nanoparticles and Au films for growth of nanowires on the GaAs(111)B surface have been studied by a combination of experimental and theoretical techniques. If Au is present in either form, annealing to temperatures relevant for nanowire growth results in the formation of a thin Au wetting layer. Based on density functional theory calculations and experimental data, a structural model is propose

Popular Abstract in Swedish Presenterar resultat inom algoritmer och datastrukturer för att hantera sekventiella data (strängar), med användningar bland annat inom datakomprimering. Särskilt behandlas varianter av suffixträd och näraliggande ämnen, som sortering av suffix. Vad gäller komprimering behandlas modellering av källor med hjälp av både strängbaserade metoder (t.ex. Ziv-Lempel) och probabThis doctoral dissertation presents a range of results concerning efficient algorithms and data structures for string processing, including several schemes contributing to sequential data compression. It comprises both theoretic results and practical implementations. We study the suffix tree data structure, presenting an efficient representation and several generalizations. This includes augmenti

It is important to provide scientific knowledge of wheelchairs as occupant-protecting seats in motor vehicles. This study aimed at examining the situation in Special Transportation Services (STS), an important mode of transport for wheelchair users in Sweden. The perceived safety levels were assessed and examined, and extensive field experience was gained. During the study in three Swedish cities

The article presents theoretical and methodological approaches relevant for the research on audio description (AD) and exemplifies the application of these approaches by studies on live audio description of films conducted at Lund University. A cognitive, reception-oriented perspective on AD and the framework of embodied cognition are in focus. It is claimed that previous research on scene percept

This paper examines the role of the photograph as vehicle for historic and virtual memory, in the remembrance culture of the Holocaust.