This thesis compares four relevance feedback methods. The Rocchio and Ide dec-hi algorithms for the vector space model and the binary independence model and Okapi BM25 within the probabilistic framework. This is done in a custom-made Information Retrieval system utilizing a collection containing 131 896 LA-Times articles which is part of the TREC ad-hoc collection. The methods are compared on two grounds, using only the relevance information from the 20 highest ranked documents from an initial search and also by using all available relevance information. Although a significant effect of choice of method could be found on the first ground, post-hoc analysis could not determine any statistically significant differences between the methods where Rocchio, Ide dec-hi and Okapi BM25 performed equivalent.

The aim of this thesis is to compare the effectivity of using a natural language and a controlled vocabulary when performing subject searches in the bibliographic database LISA Library and Information Science Abstracts. 20 topics were created and for each topic two searches were made, one by using a query formulated with natural language directed to the abstract field and the other one by using a query formulated with descriptors from the thesaurus in LISA directed to the descriptor field. The average relative recall amounted to 64,8% for the AB-queries and 54% for the DE-queries. Failure analysis showed that the majority of the relevant documents not retrieved by AB-queries could have been retrieved with other query terms, such as synonyms. In a natural language there are many different ways of expressing a topic, and this tends to have a negative effect on retrieval effectivity.

In information retrieval there is a problem with ambiguous words. To solve this problem word sense disambiguation WSD is used. Few studies combining information retrieval and word sense disambiguation have been conducted with Swedish words. The purpose of this thesis has been divided in two. The first purpose was to examine Swedish information retrieval and disambiguation in the query phase.

Background: The speech- and language deficit aphasia affects 12 000 persons annually in Sweden. Aphasia is caused by injury in the brain and the most common etiology is stroke. According to the tool for describing and assessing aphasia, A-FROM (Kagan et al., 2008), the four following aspects of aphasia need to be considered: severity of aphasia, participation in life situations, communication and language environment and personal factors. Several different interventions and treatments can be performed in every domain. There is scientific evidence for interventions performed by speech and language pathologists; however, the question is yet being discussed since results are unambiguous.Purpose: The main purpose of this study is to investigate which aphasia interventions performed by speech and language pathologists that are supported by evidence.

The aim of this study is to analyze and describe the research front within information science. To reach this purpose we ask the following research question: Which research themes can be identified within the subject field of information science by using bibliographic coupling in combination with cluster analysis.The data for our study consists of articles from the journals Journal of the American Society for Information Science and Technology and Journal of Documentation throughout the years 2004-2006. The bibliographic information from the articles was analyzed with the combined methods of bibliographic coupling and cluster analysis. This gave fifteen clusters within which we identified research themes. When analyzing these results we found four main fields of research within the research front of information science: Information retrieval, bibliometrics, knowledge organization and information science as research discipline.

The thesis deals with three document retrieval models based on logic: the Boolean model,the fuzzy model and the Van Rijsbergen model.In Chapter 1, the author presents the purpose of the thesis. This is to give the logical foundationof the models, to describe them and to examine them critically. In Chapter 2, some importantnotions in document retrieval are presented. Chapter 3 is devoted to the Boolean model, Chapter4 to the fuzzy model and Chapter 5 to the Van Rijsbergen model.These three chapters are organized in the same way. First, the logical foundation of the modelis given.

This paper contains a study where we apply cross media and storytelling into the design process of a practical commercial campaign. The purpose is to learn more and deeper by using cross media and the ideal of storytelling practical. We applied a qualitative method for research of the project to provide a high-quality empirical work. The result shows that by using well-structured story early in the design process you will easily succeed with your cross media design..

Abstract In general, language is the key to the community, to self-sufficiency and independence. Being able to speak the Swedish language is a part of the community integration. Integration also has a practical aspect that includes everyday life and affects one's opportunities in the labor market. Therefore, we have selected in this paper to focus on the language and integration but inevitably we will also discuss the education you need on the labor market. The purpose of this study is to describe how the staffs at the Language Café Nobel works for an increased integration in Malmo, and examine the significance of Language Café Nobel have for their participants.

The amount of information stored on the internet grows daily and naturally the requirements on the systems used to search for and analyse information increases. As a part in meeting the raised requirements this study investigates if it is possible for a automatised text analysis system to distinguish certain groups and categories of words in a text, and more specifically investigate if it is possible to distinguish words with a high information value from words with a low information value. This is important to enable optimizations of systems for global surveillance and information retrieval. The study is carried out using word spaces, which are often used in text analysis to model language. The distributional character of certain categories of words is examined by studying the intrinsic dimensionality of the space, locally around different words.

The thesis aims at, from a user perspective, examining how a group of industrial researchers understand the information seeking in their every day work. A qualitative method is employed. The empirical material consists of open-ended interviews with in all ten researchers. All of them work at the Swiss-Swedish Technology Company ABB's research laboratory in Västerås. The thesis is based on the opinion that the scientific knowledge production has become commercialised and that the scientific communication is going through certain changes.

English is an international and global language that students, regardless of mother tongue, encounter in their everyday lives. In Sweden, students are introduced to English teaching in year 1, 2 or 3, and in some cases, year 4. English teaching can sometimes be problematic when the language of instruction often consists of Swedish, which for second language students becomes a challenge to acquire new skills in a week language.The study aims to examine, with a qualitative study, how pedagogues plan and implements English teaching in first grade with students whose mother tongue are other than Swedish. Further, the aim was to examine how pedagogues say they relate to the fact that second language pupils participating in English lessons and if they think it affects their English teaching.The conclusions is that the pedagogues has probably not been problematized the phenomenon examined and say they do not adapt their teaching. In the interviews reveals information about the teaching method which, in my opinion, indicates that, unconsciously, adapting their teaching when they have second language students.

Na?r en student idag utbildar sig vid ett svenskt la?rosa?te beho?ver denne info?rskaffa sig kurslitteratur som ett komplement till undervisningen. Det finns inget sja?lvklart tillva?gaga?ngssa?tt fo?r hur studenten info?rskaffar sig sin kurslitteratur och information om litteraturen presenteras inkonsekvent o?ver olika ka?llor . Vi utvecklar da?rfo?r ett sto?dsystem fo?r so?kning av kurslitteratur, med syfte att effektivisera so?kprocessen samt att exponera studenten fo?r eventuellt tidigare fo?rbisedda ka?llor till kurslitteratur. Systemet utva?rderas i fo?rha?llande etablerade so?kstrategier hos 22 studenter. Resultaten visar att anva?ndandet av detta sto?dsystem inte bara minskar antalet steg markant utan a?ven minskar antalet tja?nster studenten anva?nder fo?r att info?rskaffa sin kurslitteratur ja?mfo?rt med studenters egna so?kstrategi idag..

The aim of this thesis is to investigate librarians? experiences and opinions about a system for fiction retrieval based on the subject headings list Att indexera skönlitteratur. I want to know if librarians experience that subject headings searches for fiction literature are a good working tool, if there according to librarians are other resources and means that makes fiction available and searchable, and how they estimate the possibility of non-professionals to use subject headings for fiction retrieval. Six librarians at public libraries in Göteborg where interviewed. The interviews dealt with their work with fiction literature, their experiences of subject headings as a fiction retrieval tool, and with their contacts with patrons.

In query expansion (QE) terms are added to an initial query in order to improve retrieval effectiveness. In this thesis we use QE in the sense that a reformulation of the query is done by deleting the terms in the initial query and instead replacing them with terms from the documents retrieved in the initial run. The aim of this thesis is to, in a experimental full text invironment, study and compare the retrieval result of two different query expansion strategies in relation to each other. The following questions are addressed by the study: How do the two strategies perform in relation to each other regarding recall? What may be causing the result? Are the two strategies retrieving the same relevant documents? Two strategies are designed to simulate a searcher using automatic query expansion (AQE) either with or without relevance feedback.

English is an international and global language that students, regardless of mother tongue, encounter in their everyday lives. In Sweden, students are introduced to English teaching in year 1, 2 or 3, and in some cases, year 4. English teaching can sometimes be problematic when the language of instruction often consists of Swedish, which for second language students becomes a challenge to acquire new skills in a week language.The study aims to examine, with a qualitative study, how pedagogues plan and implements English teaching in first grade with students whose mother tongue are other than Swedish. Further, the aim was to examine how pedagogues say they relate to the fact that second language pupils participating in English lessons and if they think it affects their English teaching.The conclusions is that the pedagogues has probably not been problematized the phenomenon examined and say they do not adapt their teaching. In the interviews reveals information about the teaching method which, in my opinion, indicates that, unconsciously, adapting their teaching when they have second language students.