Rotundus AB är ett världsledande företag inom området för sfäriska robotar som håller på att utveckla den markbundna farkosten GroundBot(tm). För att detektera robotens translations- och rotationsrörelser används accelerometrar och hastighetsgyron. Dessutom används sensorerna för tröghetsnavigering när GPS-täckning saknas.Målet med projektet innebär att ta fram en metod för att utvärdera precisionen hos sensorer för robotens tröghetsnavigeringsenhet. Metoden koncentrerar sig på fyra av sensorernas felkällor: Skalfaktor, bias, slumpvandring och biasinstabilitet.För att beräkna skalfaktorn och biasen används linjära minsta kvadratmetoden där utsignalen från sensorn anpassas mot ett teoretiskt värde. Slumpvandringen och biasinstabiliteten utvärderas med Allans varians..

Tillståndsmaskiner är vanliga komponenter i många digitala konstruktioner. En vanlig typ av tillståndsmaskin är räknare. Räknare är ofta ganska kostsamma att implementera, med avseende på antalet grindar. För att reducera denna kostnad kan istället en PRBS (Pseudo Random Binary Sequence) användas. Denna byggs upp av ett register där en xor - operation utförs mellan två positioner, som beror på längden av registret.

This study was carried out at Luftfartsverket (LFV Group, Swedish Airports and Air Navigation Services). The aim was to study what characterizes an employer of choice and further to examine how well the employees at Luftfartsverket feel that their employer lives up to this image. A quantitative method was applied in the form of a selfdeveloped questionnaire. It was answered by a random sample of employees at Luftfartsverket.The results showed that salary, good leadership, good relations to colleagues and a sense of participation were important factors to be an employer of choice. In the organization at hand good colleagues were the most fulfilled factor whereas good leadership were the least fulfilled factor.

Denna uppsats undersöker sambanden mellan ett antal ekonomiska variabler och den nominella växelkursen på kort sikt mellan Kanada och Japan. Resultaten av den ekonometriska analysen av sambanden mellan växelkursen och de oberoende variablerna ränteskillnad, börsutveckling och oljepris ger svaga resultat på dagsbasis över hela perioden första januari 2001 till sista oktober 2005. Under delar av perioden verkar dock ett visst samband föreligga vilket påvisas med rullande regression. Detta antyder att valutamarknadens fokus inte är konstant utan att vissa variabler stundtals är viktigare för växelkursutvecklingen än vad de är sett över hela perioden. En trendvariabel har under delar av perioden en signifikant påverkan på växelkursen, vilket förevisar att den nominella växelkursens utveckling inte alltid följer en random walk..

This thesis considers the problems associated with searches in insufficiently geographically tagged data. The thesis was carried out at Booli Search Technologies AB, a company developing a search engine for the Swedish real estate market.The aim of the thesis is to identify some areas of possible improvements of the company?s existing technical platform, perform a benchmarking among similar services, suggest possible solutions and lastly, build a prototype from one of the suggested solutions.The thesis starts out with defining the problems that the search engine faces: some areas are not possible to perform searches on, the users are not presented with the full search result that they expect, some results are placed incorrectly on the map associated with the search results and results are also not described with enough geographical information. These problems are due to the fact that the data retrieved at the indexing stage in the company?s information retrieval process are insufficient and incomplete.As a result of a benchmarking process and after discussing the results, severalinteresting solutions were identified.

I många nätverk antas det att någon form av fix infrastruktur existerar och att nätverkets olika noder kan använda denna för att kommunicera med varandra. I ett ad hoc-nätverk antar man att det inte finns någon fix infrastruktur och att noderna måste använda varandra för att kunna kommunicera. Ett exempel på ett ad hoc-nätverk kan vara bärbara datorer sammankopplade med infraröda länkar under ett möte. När ad hoc-nätverket är mobilt innebär det att noderna rör sig.I detta arbete har de tre protokollen Epidemic, GeoMean och GeoMove tillsammans med de två rörelsemodellerna Waypoint och den utökade slumpmässiga vandringen implementerats i en nyskriven simulator för denna typ av nätverk.De två Geo-protokollen är nyutvecklade och syftar till att använda geografisk information för att underlätta kommunikationen i denna kategori av nätverk tillsammans med den nya utvidgade slumpmässiga vandringsmodellen..

This thesis discusses model based tracking of radar echoes in tanks with liquid content. The errors in the measurements are not always random in these cases, and the interference that occurs when nearby echoes moves in relation to each other makes tracking difficult. The tracking problem can be broken down to four parts; track initiation, track destruction, association of the measured echoes to the tracks and to update the tracks with the associated echoes. The radar measurement is primarily made on the surface. However, additional echoes from the tank floor or other structures and double bounces are normally present.

The aim of this Master?s thesis is to examine the retrieval performance of two search engines, Yahoo! News and Sesam, specialized on indexing news articles in Swedish. Thirty search questions were used in this study, divided into three different categories: domestic news, amusement and sport. Precision has been calculated both for the 30 search questions as a total and for the three categories as well. Precision was calculated at every DCV-level and then divided with the number of search questions used, in an attempt to reach an average measure.

Sufficient and accurate search support is a crucial factor for successful information searching on web sites. This thesis evaluates the search support on the second version of the web site studera.nu with particular focus on how the web site meets up to criteria formulated on the basis of theories from research in information seeking and information searching. The evaluation is a preliminary investigation that may serve as a basis for a future more comprehensive evaluation. The four major questions for my thesis have been: 1. In which different ways can a user search? 2.

The purpose of this Master?s thesis is to present a survey of how Swedish libraries provide information services for children. In this thesis ?information? means non-fiction material and ?children? do not include preschool children. The method used is knowledge overview and the material (mostly Master theses in LIS published January 2001-June 2006) is related to user studies of children as information seekers.

This thesis evaluates and compares the retrieval effectiveness of the two search engines Google Scholar and Scirus, which both specialises in indexing scholarly material on the web as well as journal articles. Thirty search queries are used and the first twenty retrieved documents for each query are examined for topical relevance and scholarly content. The search queries are based on legitimate information needs taken from a scientific questionbox on the web. Queries are expressed with advanced search operators and are the same for both search engines. Precise relevance criteria are set up and a binary scale is used when judging.

Purpose The purpose of our study was to investigate the changing nature of volatility during the last 80 years. Like in an American study, we tried to find some trends in the risk of stocks and bonds that would have an impact on the balance of a portfolio of stocks and bonds. At the same time we investigated the influence of inflation on the choice of portfolio. Methods We have used standard statistic tools and formulas to obtain our results. In most cases it was a matter of calculating average and standard deviation.

A mobile testing application using Unity was developed to analyse what impact button sizes and button layouts has on the accuracy of touch as well as the time to finish a labyrinth. This was tested on a Nexus 4 phone. 28 users navigated a small object through a labyrinth in which they collect keys to open the door to the exit. Each participant did the test 6 times with different combinations of button size and button layout each time, done in a random order. Hits, misses, completion time, order of button size and order of button layout was collected and then visualized using R.

The aim of this study was to elucidate day surgery patients´ subjective experiences of postoperative pain after orthopedic and abdominal surgery and if there was any difference in the experience according to sex and age.Selection was not random and the study included 87 patients. Data were collected from patient questionnaires. VAS method was applied in the questionnaire to measure patients´ pain.The outcomes of the study show that there was no significant difference between women´s and men´s experiences of pain during days 1-7.It was found that patients undergoing orthopedic surgery had significantly more pain on day 7 compared to those patients who underwent abdominal surgery.There was a significant negative correlation between age and perceived pain on day 7.Patients in day surgery group had significantly less pain on day 7 compared with day 1.The patients who have undergone orthopedic surgery and younger patients had more pain on day 7 while the patients in day surgery group had a pain level decreased gradually and on day 7 was the lowest.It appears that pain relief on day 7 of younger patients and patients who have undergone orthopedic surgery is an area that can be improved..

About 80 % of all Swedish dairy cows are kept in tie-stalls, but loose housing is increasing, probably because it is more profitable for the farmer. The design of the floors is of cruicial importance to the cows well-being. Traditionally, the most common type of floor in the alleys of a cubicle system still is a slatted manure-draining floor made of concrete. The typical Swedish design has 125-mm slats and 40-mm slots, maximally. With too wide slots, there is an increased risk of injuries to the claws when the cow makes a hasty move.