Search for dissertations about: "changed environments"

Showing result 1 - 5 of 87 swedish dissertations containing the words changed environments.

  2. 1. Robust self-localization of mobile robots in dynamic environments using scan matching algorithms

    Author : Ola Bengtsson; Christian Schlegel; Chalmers tekniska högskola Göteborg; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mobile robot; Self-localization; Scan matching algorithm; Changed environments; Dynamic environments; o-variance matrix; Kalman filter; Signal processing; Signalbehandling;

    Abstract : The most fundamental task for any mobile robot is to perform self-localization in the world in which it is currently active, i.e. determine its position relative its world. Encoders that count wheel rotations are often used, which can be turned into relative position estimates by mean of integration. READ MORE

  4. 2. Autonomous Localization in Unknown Environments

    Author : Jonas Callmer; Fredrik Gustafsson; Paul Havinga; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Localization; indoor positioning; heading estimation; magnetometers;

    Abstract : Over the last 20 years, navigation has almost become synonymous with satellite positioning, e.g. the Global Positioning System (GPS). On land, sea or in the air, on the road or in a city, knowing ones position is a question of getting a clear line of sight to enough satellites. READ MORE

  5. 3. Fossilized microorganisms in volcanic rocks from sub-seafloor environments

    Author : Magnus Ivarsson; Nils Holm; Sten Lindblom; Curt Broman; Harald Furnes; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Microfossils; hydrothermal systems; deep biosphere; Other earth sciences; Övrig geovetenskap; Mineralogy; Petrology and Geochemistry; mineralogi; petrologi och geokemi;

    Abstract : Fossilized microorganisms are focused in this thesis. Such organisms have been observed in drilled basalt samples from the Emperor Seamounts in the Pacific Ocean collected during ODP (Ocean Drilling Program) Leg 197. READ MORE

  6. 4. Evolution in changing environments revealed by fire melanism in pygmy grasshopper

    Author : Magnus Karlsson; Anders Forsman; Karl Gotthard; Linnéuniversitetet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Evolution Melanism Polymorphism Pygmy grasshoppers; Biology; Biologi; Evolutionary Biology; Evolutionsbiologi;

    Abstract : According to theory, genetic diversity can be maintained by environmental variation and the degree of genetic and phenotypic polymorphism may enhance the ability of populations to endure stress imposed by changing environments. In my thesis I used colour polymorphic pygmy grasshoppers (Tetrix subulata) as a model system to explore how environmental variation influenced genetic diversity. READ MORE

  7. 5. Language learning and technology. Student activities in web-based environments

    Author : Linda Bradley; Göteborgs universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; language learning; web-based technology; learning activites; student integration; peer reviewing; cultural exchange; language learning;

    Abstract : The impact of the web as a communicative arena, based on the use of social software, has changed conditions for communication on all levels of society; privately, at work and in education. This has opened up for multicultural communication, frequently with English as the lingua franca. READ MORE