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Social environmental scientist Contact details Email: johanna [dot] alkan_olsson [at] mgeo [dot] lu [dot] seOrganisation Department of Earth and Environmental Sciences (MGeo) Service point: 16 WebpageJohanna Alkan Olssons profile in Lund University research portalOther affiliations Director of first and second cycle studies Department of Earth and Environmental Sciences (MGeo) Member of Strategic
https://www.cec.lu.se/johanna-alkan-olsson - 2026-06-12
This doctorate thesis focuses on sparse regression, a statistical modeling tool for selecting valuable predictors in underdetermined linear models. By imposing different constraints on the structure of the variable vector in the regression problem, one obtains estimates which have sparse supports, i.e., where only a few of the elements in the response variable have non-zero values. The thesis coll
BACKGROUND: Although the association between cytosine-adenine-guanine (CAG) repeat length and age at onset of Huntington's disease is well known, improved prediction of onset would be advantageous for clinical trial design and prognostic counselling. We compared various measures for tracking progression and predicting conversion to manifest Huntington's disease.METHODS: In this prospective observa
This paper re-focuses the Silk Road discussions from the position of contemporary art in Central Asian region. Since the late 1980s contemporary art in Central Asia boomed and it eventually became an alternative public space for the discussion of cultural transformations, social and global processes and problems that local societies faced. Initially the questions raised by many artists concerned i
Popular Abstract in Swedish Nanotekniken håller i skrivande stund på att revolutionera samhället med nya innovationer inom exempelvis elektronik och medicin. En viktig del i detta är utvecklingen av nya och förbättrade sätt att avbilda strukturer av nanometerstorlek (en nanometer är en miljarddels meter). Avancerade karakteriseringsmetoder skapar en ökad förståelse för hur nanostrukturer beter sigUltrafast nano-optics is a new and quickly evolving research field centred around the control, manipulation, and application of light on a nanometre and femtosecond scale. This can lead to improved electro-optical devices, more sensitive spectroscopy, and real-time control of chemical reactions. However, understanding the simultaneous nanometre and femtosecond evolution of nano-optical fields requ
Popular Abstract in Swedish Föräldradeltagande i barnkirurgisk sjukvård Sjukhusvistelse innebär för många barn och dess föräldrar oro och osäkerhet. Hur vistelsen upplevs och vilka reaktioner denna leder till beror dels på det individuella barnet och föräldrarna dels på mottagandet de får på sjukhuset. Under senare år har stora ansträngningar gjorts för att undvika att barn och föräldrar separeraIn order to deliver optimal paediatric care, we need to know what children and their parents need, expect, and experience. Thus, the general aim of the studies upon which this thesis is based was to elucidate different aspects of parental participation in the care of their child during hospitalisation for paediatric surgery, a specific aim being formulated for each of the four studies. The aim of
Abstract in UndeterminedNorm supporting actors and structures for change.Education every day effects almost half of the population in Sweden and Nordic countries. Most research on schools and education is based within education science and there is a lack of other social science perspectives. Sociology of law with its focus on social norms, ethical values and legal norms has something different to
During the latest years the research on the effects of moisture on clothing system has been boosted. New information has revealed phenomena, e.g. “heat pipe” effect with its condensation-evaporation cycle(s) that has not been considered earlier in prediction of physiological reactions or evaluating clothing properties. Considering the material properties, e.g. the evaporative resistance measuremen
Popular Abstract in Swedish Hur kan nattaktiva insekter se i mörker med fel sorts ögon? Majoriteten av alla dagaktiva insekter har en sorts facettöga som kallas appositionsöga. Appositionsögon är anpassade till ett liv med god tillgång på ljus ? nattaktiva djur har därför i princip alltid andra sorters ögon (superpositionsögon). Anledningen till att appositionsögon fungerar bäst på dagen är att dDue to our own preference for bright light, we tend to forget that many insects are active in very dim light. The reasons for nocturnal activity are most easily seen in tropical areas of the world, where animals face severe competition for food and nocturnal insects are able to forage in a climate of reduced competition and predation. Generally nocturnal insects possess superposition compound eye
The Radon transform and its adjoint, the back-projection operator, can both be expressed as convolutions in log-polar coordinates. Hence, fast algorithms for the application of these operators can be constructed by using FFT, if data is resampled at log-polar coordinates. Radon data is typically measured on an equally spaced grid in polar coordinates, and reconstructions are represented (as images
This thesis explores the educational and methodological opportunities of the ‘not-yet-seen’. Departure is taken in the philosophy of Deleuze and Guattari, and in pivotal concepts that challenge the image of the stabile subject, chronological time and established dichotomies in general. The aim of the thesis is three folded. First, it aims to plug the philosophy of Deleuze and Guattari in with educ
This study is an exploration of the interdisciplinary field of urban sustainable development in the first stage of a PhD project in human ecology. The purpose of the PhD project is to study the premises for urban sustainable development in the context of (relatively) affluent economies in Europe or, more generally, in the North. My case study is Malmö placed in the Öresund region farthest south of
Popular Abstract in Swedish Avhandlingen består av ett inledande kapitel och tre essäer, som studerar sjukpenningförsäkringen, sociala normer och sjukskrivning. Den första essän, Group-Specific Social Norms and Economic Incentives in a General Welfare System, behandlar interaktionen mellan ekonomiska och sociala drivkrafter i ett generellt bidragssystem. Vi anknyter resultaten till sjukpenningförThe thesis consists of an introductory chapter and three essays, considering sickness insurance, social norms and absence certification. The first essay, Group-Specific Social Norms and Economic Incentives in a General Welfare System, investigates the interaction between economic incentives and social influences in a general welfare system. We relate the results to sickness insurance. The model i
People have become more and more mobile as a result of advancements in wireless communications technologies. The mobile phone as an enabler of this increased mobility has become an ever more important part of our society but comparatively little research has been done concerning mobile services at the organisational level as opposed to the individual level. With our study we wish to contribute to
Populärvetenskaplig sammanfattning: Jordens klimat står under ständiga variationer och förändringar, och det är inte alltid lätt att sära på orsak och verkan bland den mängd av faktorer som styr klimatet. För att kunna reda ut ursprunget till de förändringar som sker, måste de bakomliggande processerna vara väl kända. Sedan är det möjligt att genom matematiska modeller uppskatta de individuella prSeveral studies have analysed the relationship between Normalised Difference Vegetation Index (NDVI) and radiative surface temperature. A main goal for most studies have been to find the best method for carrying out land cover classifications and to study land cover changes, based on a combination between the two parameters. Since atmospheric components have a significant influence on both paramet
Economic sanctions - the exercise of pressure by one international actor to produce a change in the political behaviour of another international actor - are instruments used in the exercise of foreign policy. Due to the perceived ineffectiveness of traditional economic sanctions, such as trade embargoes, a new type of sanctions has emerged. Unlike economic sanctions in the traditional sense, these
Purpose: Within the construction business pricing is traditionally done at current account. The purpose of this report is to investigate why pricing levels are low within the construction consultant industry in comparison to other consultant industries, as well as to examine what affects the choice of pricing models. In addition to this the report aims to analyze pricing models used today and to d
