The purpose of this Masters thesis is to examine the performance of queries that are expanded by synonyms and hyponyms from Svenskt OrdNät, the Swedish version of the Princeton WordNet. Four different types of queries were constructed: a baseline query S1, the baseline query expanded with synonyms S2, the baseline query expanded with hyponyms S3 and finally the baseline query expanded with the synonyms and hyponyms used in S2 and S3. The terms for expansion were picked by hand. The queries were executed in the Query Performance Analyser QPA, a tool used in IR education and in experimental IR research for analysing and comparing the performance of individual queries. 20 topics from the test collection GP_HDINF were chosen for the experiment.

Today many different types of lock systems are used all over the world. Passwords, finger prints and magnetic strips are a few examples. When the key is a three dimensional object, lika a physical metal key, the security depends, in a high degree, on that you can?t copy the object without access to it. One approach to copying the object is photographing the object, and from these photographs create a copy.

Water is our most important provision and its quality is above all dependent on the geological conditions in the area from where it is extracted. Due to geological properties there are certain areas with an elevated risk of high uranium levels in the ground water, which in turn constitutes a risk for human health. Consumption of water that contains a high concentration of uranium implies a health risk due to the chemical characteristics of uranium. Livsmedelsverket (The National Food Administration) and Socialstyrelsen (The National Board of Health and Welfare) therefore recommend that precautionary measures should be taken when the uranium concentration in ground water exceeds 15 micrograms per litre. In particular, drinking water collected from wells in areas with uranium-rich bedrock may have a harmfully high level of uranium. One of the wells of the Ärla water purification plant, located near Eskilstuna, Sweden, contains water that exceeds the guideline of 15 micrograms per litre. One interesting technique for removing uranium from drinking water is adsorption to reactive filter materials.

Detta examensarbete undersöker effekter av en elektromagnetisk puls på IC-kretsar.För att kunna utvärdera inverkan har ett testobjekt, innehållande komponenter som skall testas, konstruerats. Detta testobjekt består av batteri, en enkel komponent och last. Ett pulsaggregat och en antenn användes för att generera de elektromagnetiska pulser som testobjektet utsattes för. Resultaten visar att inverkan på de testade komponenterna är möjlig. Inverkan visade sig vara beroende av bl.a.

A tough working climate and the lack of extrinsic motivation at workplaces within health care raise the question of what instead drives employees within this industry. A possible answer to this is Public Service Motivation (PSM) - a type of motivation that is based on the desire to do good for society and its individuals. In order to investigate this further we have performed a qualitative study consisting of ten interviews with people working with institutional care, where the purpose has been to identify the sources of motivation and determine the impact of PSM. The results show that the compassion dimension of PSM appears to be one of the most salient motivational factors. While the rest of the PSM dimensions fail to explain the level of motivation to the same extent as compassion, other factors are recognized, such as relatedness and aspects of the nature of the work itself.

Artificiell intelligens integreras idag i alltfler tekniska system. Trots det, ?r det fortfarande sv?rt att i praktiken implementera modeller fr?n grunden p? grund av h?ga resurskrav i form av data och ber?kningskraft. Detta motiverar s?kandet efter effektivare modeller. I denna artikel unders?ks Kolmogorov Arnold Networks (KANs), en alternativ arkitektur av neurala n?tverk och j?mf?rs med traditionella arkitekturer som multilayer perceptrons (MLPs) och faltningsn?tverk.

Korrigeringseffekter och stereotyper hänger ihop, för att studera detta användes bilder av ansikten med olika etnicitet och självrapporteringstest skapade av Nosek, Sidanius och Pratto och Dunton och Fazio.Svenska studenter vid Lunds universitet deltog i undersökningen där de delades in två grupper med olika instruktioner, dels falsk information om undersökningens syfte och dels information att vi studerade stereotyper. Detta gjordes för att kunna studera deras korrigeringseffekter. Följaktligen var studien av en experimentell design.Vi fann att korrigeringseffekter fanns hos de båda grupperna vad gällde alla etniska grupper utom vita män, vilka inte hade korrigerats av den grupp som fått felaktig information. Detta visar att korrigering sker för alla minoritetsgrupper till följd av en önskan att inte verka fördomsfull oavsett kontext..

Syftet med examensarbetet var att undersöka vilken inställning elever har till NO och teknik. I undersökningen användes enkäter som är utformade som intervjublad, med öppna svarsfrågor, vilket gör att det är elevernas tankar som framkommer i svaren. Det är 320 elever från fyra olika skolor i årskurserna 4-6, som är med i studien. Detta för att resultat mellan skolor skulle kunna jämföras. Av resultaten framgår att de flesta eleverna har en positiv inställning till NO och teknik.

This study investigated how banner ads, depending on its quality and placement,can capture a user's attention while searching for editorial content in an online newspaper. Furthermore, the user's search strategy was also studied to see whether it varied depending on the placement of an ad. An experiment was conducted where 20 subjects searched for articles in a Swedish online newspaper while their eye ovement was recorded with a headmounted eye?tracker. In each search task the online newspaper contained either a low quality ad or a high quality ad.

During our formative years, technology has always had a natural part of everyday life, and for us technology has never been particularly gendered. If this depends on the climate and the attitude of our homes, ourselves, the combination of both or something completely different is a question we have asked ourselves at times. But our approach to technology does not seem as obvious to all women, and today the IT industry is heavily dominated by men. This has meant that we have asked the question whether there is any underlying reason why so few women opt for IT courses? Is there a link between how different IT organizations profiles and the prevailing gender ratio? The purpose of this study is to investigate whether there is any connections between how IT organizations are related to gender issues and how the structures, attitudes and gender actually looks like in the IT industry today, and how this can be seen in their branding efforts.

This study was conducted to test the hypotheses that a forest managed by selective cutting can store more carbon than a forest managed by clearcutting. The study was carried out as a meta-analysis. The data that was found was analyzed by performing t-tests on the proportional effect that the two silvicultural methods had on the driving factors of CO2-efflux and carbon stores in coniferous boreal forest. In all areas tested, an effect in favor of selective cutting was found, but not all of them significant however. The soil respiration following selective cutting was significantly lower than that of clearcutting, and the primary production of a clearcut area cannot according to reason exceed that of an area post-selective cutting.

Syftet med examensarbetet är att synliggöra naturvetenskap och teknik mer på förskolorna. Arbetet har resulterat i ett praktiskt användbart arbetsmaterial för förskolan, Upptäck och Utforska Naturvetenskap och Teknik med Kråkis ? ett arbetsmaterial för förskolan. Det är ett årstidsrelaterat arbetsmaterial som innehåller experiment kopplat till fysik, kemi, natur och teknik där olika fenomen behandlas. Arbetsmaterialet är framtaget genom inläst litteratur och har utvärderats med materialtest på flera förskolor, samt genom en enkätundersökning och observationer.

Arbetet gjordes för att ta reda på vad forskningen säger om laborationernas roll i fysikundervisningen. Detta gjordes genom att jag läste flera olika forskningsrapporter, bland annat från en stor undersökning inom EU där ett försök gjordes att undersöka måluppfyllelsen i dagens fysikundervisning. Forskarna tog först reda på vilka mål lärare har med sin undervisning, och sedan togs reda på i vilken utsträckning olika typer av undervisning hjälper eleverna att nå dessa mål.Resultaten visar att det bästa sättet att nå de fem huvudmålen (Länka teori och praktik, lära sig att utföra experiment, lära sig vetenskapliga metoder, öka motivationen och undersöka elevernas kunskaper) är en blandning av undervisningsmetoder, där laborativa moment är en viktig del. Min egen undersökning visade på samma resultat. För att få eleverna att förändra sina alternativa begrepp, så att de stämmer bättre överens med de vetenskapliga, krävs något mer än en öppen laboration.Variation verkar vara nyckeln till god måluppfyllelse..

Previous research does not show a clear picture of the perception of personalized advertising as studies give different results - there are both positive and negative aspects. The purpose of this study is to improve the knowledge and understanding of the impact of personalized advertising in the new Internet era. The aim is to answer whether personalized advertising has more positive than negative effects on Facebook or if marketers today should rethink regarding this issue. An experiment with three advertisements was defined where one ad was with no personal targeted content and the other two included personally targeted content. These ads were analysed with the theories word of mouth, information overload and psychological ownership to see if interesting results could be found regarding ad attitude, click intention and purchase intention as well as to investigate if the attitude to Facebook could have an impact on the results.

Maize for silage has been used as fodder in different parts of the world for a long time and has recently become more common also in Sweden. Our cold climate has been a problem as maize is very sensitive to low temperatures and frost. With new varieties and better techniques for cultivation it is now possible to grow maize in the southern and middle parts of Sweden. As for the north of Sweden the length of the cultivation season is a limiting factor as there are too few days with temperatures of over +10 ºC. Maize is well suited for silage making but oxygen-free conditions are required.