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.

In order to maintain a high safety level at a nuclear power plant it is important not only to measure the reliability of the components and systems of the plant, but also to investigate how the plant responds to human actions. One of the most hazardous situations in managing a power plant is fire occurring in critical areas. This study concerns the prospect of the local fire brigade to suppress a fire that has started in one of the most critical rooms for maintaining high reactor safety. The model created gives an indication on the possibilities of succeeding in suppressing a fire. In order to get a more reliable fire fighting the following advice are given:- Let the fire brigade go rounds in the plant together with the personnel, during which recommended fire suppressing methods are determined to avoid long preparation time in an actual situation.- Prepare rooms with two subsystems to make them partly with no voltage.- Give the fire brigade better feedback from actual events on nuclear power plants.- Education and training in suppressing fires in electrical equipment.The probabilistic safety assessment strives to be as realistic as possible.

The purpose of this Master?s thesis is to examine if there is any gender role stereotyping conveyed in recent children?s picture books. The picture books examined are the ten most popular which are selected by a combination of Bokjuryn in Sweden, 2005, and children voting. Furthermore there is a winner each year. The investigation concerns how protagonists, girls and boys, are portrayed and, moreover, if there are any breaches of traditional gender patterns.

Today, we see tendencies of politicians being more active in social media using selfies. According to previous research using selfies is associated with being self-centered and narcissistic. It is not known though what implications the behavior will have for a selfie-using politician in terms of chances of being elected. This study aims to contribute to the research on political communication and social media behavior. More specifically the study intends to investigate whether there is a difference between voters' views if a politician uses selfies or not, and whether there is a difference by gender.

The purpose with this masters thesis was to model the scanner in a system for laser bathymetry. The model was then used to develop a controller for the scanner so a good search pattern was achieved. Two different types of models have been tested, a physical model and a Black Box model of Box Jenkins type. The physical model has been derived from Lagranges equations. Identification experiments have been used to compute the Black Box model and to find the unknown parameters in the physical model.

The main purpose of this study is to examine celebrity candidates in the European Parliament election in Sweden and Finland. The theoretical background assumes that candidate voting is beneficial in the election to the European Parliament. Previous research also shows that there are some opponents towards candidate voting, claiming it personalizes politics and it might lead to celebrities getting elected simply because they are well known to the voters.This study is a comparative analysis and analyzes the differences between Sweden and Finland when it comes to celebrity candidates. Furthermore, Max Weber?s theory on leadership will be used to categorize the celebrity candidates further.

Evaporation is a part of the chemical recovery department at wood pulping mills. The purpose of evaporation is to remove water from the black liquor, which makes the liquor combustible. The process is very energy demanding, and having a well-functioning model of the system is of greatest interest. The model can then be used to study energy consumption and to test different control strategies. Two models have been developed during the master thesis.

This study examines whether the policy breadth and the alternatives in European politics affect variations in voter turnout between member states in elections to the European Union Parliament.The theoretical approach assumes that; a larger political polarization, an increase in EU-skeptical parties and a greater voting mobilization among groups with less means results in higher voter turnout figures. The study also consider four other variables; whether the election is held on weekends or weekdays, whether elections coincide with other national elections, whether a country has held the presidential of the EU during or the immediate term prior to the election and finally the turnout figures from national elections.The research design is based upon a quantitative analysis using data from EP elections, national elections and databases from the European Elections Studies (EES). Study unit is twelve member-state countries and their four latest EP elections (1994, 1999, 2004 and 2009). The selected member-states origin from the EU-15 excluding Belgium, Greece and Luxembourg due to their compulsory voting laws.The study found relationships between higher turnout figures in EP-elections and increase in EU-skeptical parties, greater mobilization among groups with less means, elections held on weekends, elections coinciding with other, national elections and an increase in voter figures in national elections..

This report describes a synchronous machine model with magnetic saturation in d-axis, neutralconnection and electrical exciter interface for the transient simulator PSCAD/EMTDC. It hasbeen designed and verified in comparison to the regular machine model in EMTDC.The performance of the model is very good when incorporating a linear as well as a saturatedmagnetising inductance. The dynamic deviation is only thousandths to ten thousandths perunit. By using a cubic interpolation of the saturation curve, the model gives a good representationof the saturation effect. The open source code implementation of the synchronousmachine model gives the possibility to easily adapt the model to specific requirements.The derived model makes it possible to simulate a synchronous machine with its excitationsystems, e.g.

The aim of this master thesis was to create a dynamic model for the processes in a solid fuel boiler of the moving grate type. Another aim with the model was to keep it as simple as possible but still able to catch the dynamics of the processes in the bedplate of the boiler. The creation of the model had its origin from drying and combustion equations used in earlier modeling work of boilers. The represented model has been used to simulate different kinds of disturbances in a boiler and different ways to control the boiler. These tests show that controlling a number of parameters in the bed of the boiler is an effective way to keep the grate stable during disturbances.

This master?s thesis describes the development of a model of the catalystsystem aiming at control by an MPC. A well functioning model, which is suitable in control purpose, is important while emission legislation become more and more hard to fulfill for the car manufacturers. Much research has been done in the field of physical modeling of the system, but in this work a linear adaptive time discrete ARX-model is developed and validated.The systems tendency to change its dynamic during usage implies that the model must be adaptive. The developed model proved to be well functioning and shows promising conditions for the MPC design.

This paper is about a new organization how to get smaller communities to join together and become much larger. The purpose is to find out why Norra Sandsjö community and Bringetofta and Norra Sandsjö parishes were separated when Sävsjö municipality block was formed. The purpose is further to find out what the councils of Norra Sandsjö, Nässjö and Sävsjö, the church council and the people who lived in the area thought about the decision that was made by the executive organization in this matter (länsstyrelsen in Jönköping). Voting was arranged amongst the people, who lived in the specific area that in the first inquiry was suggested to be connected with Nässjö municipality block. The source material gives the result of this voting and the opinions of Norra Sandsjö, Nässjö and Sävsjö communities in this question.

This report describes a synchronous machine model with magnetic saturation in d-axis, neutralconnection and electrical exciter interface for the transient simulator PSCAD/EMTDC. It hasbeen designed and verified in comparison to the regular machine model in EMTDC.The performance of the model is very good when incorporating a linear as well as a saturatedmagnetising inductance. The dynamic deviation is only thousandths to ten thousandths perunit. By using a cubic interpolation of the saturation curve, the model gives a good representationof the saturation effect. The open source code implementation of the synchronousmachine model gives the possibility to easily adapt the model to specific requirements.The derived model makes it possible to simulate a synchronous machine with its excitationsystems, e.g.

The purpose of this thesis was to analyse, model and finally generate dynamic vehicular motions in a train. The objective with the analysis was to find important motions for a realistic train experience. The motions from the analysis were then weighted against possibilities for generation in a motion platform.A dynamic motion model was created to model the selected motions. The model was implemented in a simulation environment, more specifically MATLAB/Simulink. The simulation environment was used to simulate the model and to generate outputs to control a motion platform.

This project consists of an adaptation, trial and evaluation of a model for practicing. Based on prior research I created a model aiming mainly to raise a musician?s self- awareness around the different parameters a performance consists of. An additional wish was for it to simultaneously assist the musician in monitoring his or her progress. With video recording and self-evaluation as the two main parts I tried the model by using it over a period of three months.