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In this thesis we study efficient computational methods for geometrical problems of practical importance and theoretical interest. The problems that we consider are primarily complete linkage clustering, minimum spanning trees, and approximating minimum weight triangulation. Below is a list of the main results proved in the thesis. The complete linkage clustering of n points in the plane ca
During recent years we have seen several large-scale crises. The 9/11 terror attacks, tsunamis, storms, floods and bombings have all caused a great deal of damage. A common factor in these crises has been the need for information and one important source of information is usually Web sites. In this work we investigate and design an overload control system for Web sites that are vital in crises. Th
This study evaluates the impact of agricultural subsidies (CAP) on unemployment and employment outside the agricultural sector. For the CAP subsidies to have an effect outside the agricultural sector, the subsidies must have a second-order effect. Thus, the Open Economy Relative Multiplier for Sweden is estimated with aggregate municipality data for the years 2001 to 2009. A side-effect of the dec
Popular Abstract in Swedish Den här avhandlingen studerar olika statistiska metoder för att utvinna information som ligger dold i en serie av tal eller andra symboler, exempelvis bokstäver. En sådan serie kan innehålla slumpmässighet eller ha vissa mätbara statistiska egenskaper, men har även ett inneboende mönster, vilket vi är intresserade av. Vi kallar vanligtvis sådana serier för signaler, ochThis thesis examines sparse statistical modeling on a range of applications in audio modeling, audio localizations, DNA sequencing, and spectroscopy. In the examined cases, the resulting estimation problems are computationally cumbersome, both as one often suffers from a lack of model order knowledge for this form of problems, but also due to the high dimensionality of the parameter spaces, which
Popular Abstract in Swedish Människan lever inte bara själv, utan tillsammans med en mängd bakterier som lever i kroppen. Större delen av dessa lever i tjocktarmen. Dessa organismer är viktiga för vår hälsa. De stimulerar immunförsvaret, sänker pH i tarmen och gör det ogynnsamt för sjukdomsframkallande bakterier att växa till. Bakterierna lever i symbios med oss och med varandra. Förändringar i taThe human gut flora is important for our well-being. The gut bacteria are able to degrade and metabolize complex carbohydrates. Examples of such carbohydrates are β-mannans. β-Mannans consist of a backbone of β-1,4-linked mannose units and are present in e.g. the endosperm of legumes such as guar or carob. The composition of the β-mannan varies with the plant source. Carob and guar β-mannans are s
In this investigation the possibilities to achieve three different goals for sustainable forestry in the landscape of Stenbrohult have been studied: Preserved biodiversity, balanced nutrient budgets, and a valuable production of timber. The consequences for the landscape and for the different estates were studied. The case study area of Stenbrohult is situated in southern Sweden, and is made up of
Popular Abstract in Swedish Jätteplaneterna, Jupiter, Saturnus, Uranus och Neptunus, är de största planeterna i solsystemet. De ligger långt från solen och har alla betydande gasatmosfärer, upp emot hundra gånger mer massiva än hela jorden. Tack vare de tjocka gashöljena, med en sammansättning som liknar solens, kan man förstå att jätteplaneterna bildades i en gasskiva. Denna skiva kallas för solGiant planets form embedded in a protoplanetary disc around a young star. Close to the midplane a large fraction of the available mass in solids is found in particles of cm to dm in size, which drift towards the star due to friction with the surrounding gas. In paper I, II, III we describe a novel theory that explains how embryos, planetesimals larger than ~1000 km, grow efficiently by sweeping up
Abstract in Spanish Este trabajo presenta un desarrollo de control de fuerza con robots industriales, utilizando para ello el robot IRB140 de ABB y un sensor de fuerza industrial JR3 de 6 grados de libertad. Como arquitectura de control se presentan dos alternativas distintas. La primera utiliza la aplicación software WebWare SDK, de ABB. En la segunda solución se ha modificado el controlador orig
