De nombreuses recherches tentent d'améliorer les convertisseurs actuels en proposant de nouvelles architectures et de nouveaux procédés de fabrication. Cette évolution est longue et doit s'exécuter étape par étape. Cependant, il est possible d'utiliser des méthodes permettant de compenser les lacunes d'un composant donné avant de franchir l'étape suivante. Ces méthodes de compensation permettent de repousser les limites du composant en attendant la maturité de la génération suivante. Elles permettent également<br />de mieux comprendre les défauts actuels et d'orienter les concepteurs vers des pistes prometteuses pour leurs recherches.<br />C'est dans ce contexte que nous proposons d'étudier l'effet d'une compensation par table de correspondance uni-dimensionnelle (LUT 1D) sur un convertisseur de type à repliement et à interpolation.<br />Afin de remplir cette table de correction, nous proposons d'utiliser et d'optimiser un algorithme d'extraction des non-linéarités du composant, basé sur une analyse fréquentielle du signal converti.<br />Les paramètres sensibles de la méthode de compensation sont ensuite étudiées au travers d'expérimentations menées sur un convertisseur spécialement conçut pour cet objectif. Nous établissons qu'il est possible de calculer une table de correspondance suffisamment robuste indépendamment des variations de fréquences et de température.<br />Finalement, nous proposons une nouvelle méthode d'extraction des paramètres spectraux d'un signal à partir de ressources de calculs très faibles. Cette étude permet d'entamer le processus d'embarquement de la compensation au sein du convertisseur. Cette finalité fait partie des perspectives liées à cette thèse.

<p>Active safety systems for automobiles in the form of camera systems have evolved rapidly the last ten years, Autoliv Electronics in Linköping develops multiple such systems. In their development process there is a need for a Break out Box (BoB) to record and playback video and CAN data as if the camera system was used in an actual automobile. The aim of this thesis has been to develop a BoB for these camera systems. The work has been divided into three phases; identification of requirements, design of the BoB and implementation of a prototype. The project has addressed four known issues with the currently used BoB; bandwidth, modularity, synchronization and usability. The result is a new BoB which is based on an FPGA connecting to a PC over Gigabit Ethernet. The design is an extendible platform for multiple channels of video, CAN data, other serial data and future extensions. A prototype proves the design concept by successfully recording video for the Autoliv NightVision system onto a PC.</p>

<p>This thesis project was carried out at Volvo Car Corporation. It is based on an EU project called Locust in which a bio-inspired visual sensor system (the Locust sensor system) for automotive collision avoidance was developed. The Locust sensor system is designed to emulate the collision avoidance functionality of the Locust grasshopper, which is well-known for its extraordinary vision based collision avoidance ability, in particular with regard to its fast reaction times to perceived threats. Volvo Car Corporation is interested in the possibility of using the bio-inspired technology developed in the Locust project to improve its already existing collision avoidance systems. Pedestrian collision avoidance is of high interest, for which the properties of the Locust grasshopper are desirable.</p><p>The purpose of this thesis project is to develop two demonstrator vehicles to test the performance of the Locust sensor system, carry out the testing, and evaluate its usability for Volvo Car Corporation. The first vehicle is a scale 1:5 model car that was originally developed in a thesis project at KTH, and the second a full scale Volvo XC90.</p><p>It was found in the testing that the Locust sensor system is promising for pedestrian collision avoidance applications. The results for detecting other vehicles were also acceptable, but Volvo Car Corporation already has other collision avoidance systems with better performance in this regard. In general the test results were very good for speeds up to about 40 km/h. This indicates that the Locust sensor system would be most usable in a city driving environment, parking lot situations, and for driving in residential areas.</p>

<p>The two modal auxiliaries can and could are investigated in this essay. Focus is on the correspondence between descriptions in grammar books and real-life data. </p><p>First four English learner grammar books aimed for Swedish high-schools were analyzed. The uses and translations of can and could found in the grammar books were then compared to real-life examples from an English-Swedish parallel corpus. </p><p>It was found that three of the grammar books categorize the uses of can and could according to ability, possibility and permission in quite general terms and these uses correlated to the majority of the corpus examples. The forth book did not mention the possibility use and stated very specific uses of the modal auxiliaries. This grammar book did not correspond to the corpus data to the same extent as the other three grammars.</p><p>It could be concluded that the assumptions made about use correlated to a greater extent with the corpus than the assumptions made about translations.</p>

<p>Detta examensarbete var en del i ett större projekt på ProElec AB i Söderhamn. Företaget ville ta fram en ny produkt i form av en displayenhet som ska kunna kommunicera med ett annat system via en operatör och ett CAN-protokoll. Användargränssnittet (GUI) i produkten understödjer växelverkan mellan en operatör och exempelvis ett hydrauliskt system på en grävskopa. Syftet med detta arbete var därför att hitta en bra metod som kan användas för att utveckla ett applikationsinterface (API) som sedan används för att implementera detta GUI på displayenheten. Enheten består av en mikrodator och en LCD-skärm och är ett system som har begränsat med minne och resurser. Därför så fanns det krav på att applikationen som använder detta API får snabba svarstider och bra prestanda, men även att den blir användarvänlig. För att kontrollera om resultatet blev bra så gjordes också en test för att se om alla krav uppfylldes. Här visade testet att resultatet blev väldigt bra och att inga kvarstående problem fanns kvar att rätta till i det API som togs fram för displayenheten.</p>

Thesis (M.S.)--University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 5, 2007) Includes bibliographical references.

The two modal auxiliaries can and could are investigated in this essay. Focus is on the correspondence between descriptions in grammar books and real-life data. First four English learner grammar books aimed for Swedish high-schools were analyzed. The uses and translations of can and could found in the grammar books were then compared to real-life examples from an English-Swedish parallel corpus. It was found that three of the grammar books categorize the uses of can and could according to ability, possibility and permission in quite general terms and these uses correlated to the majority of the corpus examples. The forth book did not mention the possibility use and stated very specific uses of the modal auxiliaries. This grammar book did not correspond to the corpus data to the same extent as the other three grammars. It could be concluded that the assumptions made about use correlated to a greater extent with the corpus than the assumptions made about translations.

Active safety systems for automobiles in the form of camera systems have evolved rapidly the last ten years, Autoliv Electronics in Linköping develops multiple such systems. In their development process there is a need for a Break out Box (BoB) to record and playback video and CAN data as if the camera system was used in an actual automobile. The aim of this thesis has been to develop a BoB for these camera systems. The work has been divided into three phases; identification of requirements, design of the BoB and implementation of a prototype. The project has addressed four known issues with the currently used BoB; bandwidth, modularity, synchronization and usability. The result is a new BoB which is based on an FPGA connecting to a PC over Gigabit Ethernet. The design is an extendible platform for multiple channels of video, CAN data, other serial data and future extensions. A prototype proves the design concept by successfully recording video for the Autoliv NightVision system onto a PC.

When patients move during an MRI examination, severe artifacts arise in the reconstructed image and motion correction is therefore often desired. An in-plane motion correction algorithm suitable for PRESTO-CAN, a new 3D functional MRI method where sampling of k-space is radial in kx-direction and kz-direction and Cartesian in ky-direction, was implemented in this thesis work. Rotation and translation movements can be estimated and corrected for sepa- rately since the magnitude of the data is only affected by the rotation. The data were sampled in a radial pattern and the rotation was estimated by finding the translation in angular direction using circular correlation. Correlation was also used when finding the translation in x-direction and z-direction. The motion correction algorithm was evaluated on computer simulated data, the motion was detected and corrected for, and this resulted in images with greatly reduced artifacts due to patient movements. / När patienter rör sig under en MRI-undersökning uppstår artefakter i den rekonstruerande bilden och därför är det önskvärt med rörelsekorrigering. En 2D- rörelsekorrigeringsalgoritm som är anpassad för PRESTO-CAN har tagits fram. PRESTO-CAN är en ny fMRI-metod för 3D där samplingen av k-rummet är radiell i (kx,kz)-planet och kartesisk i ky-riktningen. Rotations- och translationsrörelser kan estimeras separat då magnituden av signalen bara påverkas av rotationsrörelser. Eftersom data är samplat radiellt kan rotationen estimeras genom att hitta translationen i vinkelled med hjälp av cirkulär korrelation. Korrelation används även för att hitta translationen i i x- och z-riktningen. Test på simulerat data visar att rörelsekorrigeringsalgoritmen både detekterar och korrigerar för rörelser vilket leder till bilder med mycket mindre rörelseartefakter.

This thesis project was carried out at Volvo Car Corporation. It is based on an EU project called Locust in which a bio-inspired visual sensor system (the Locust sensor system) for automotive collision avoidance was developed. The Locust sensor system is designed to emulate the collision avoidance functionality of the Locust grasshopper, which is well-known for its extraordinary vision based collision avoidance ability, in particular with regard to its fast reaction times to perceived threats. Volvo Car Corporation is interested in the possibility of using the bio-inspired technology developed in the Locust project to improve its already existing collision avoidance systems. Pedestrian collision avoidance is of high interest, for which the properties of the Locust grasshopper are desirable. The purpose of this thesis project is to develop two demonstrator vehicles to test the performance of the Locust sensor system, carry out the testing, and evaluate its usability for Volvo Car Corporation. The first vehicle is a scale 1:5 model car that was originally developed in a thesis project at KTH, and the second a full scale Volvo XC90. It was found in the testing that the Locust sensor system is promising for pedestrian collision avoidance applications. The results for detecting other vehicles were also acceptable, but Volvo Car Corporation already has other collision avoidance systems with better performance in this regard. In general the test results were very good for speeds up to about 40 km/h. This indicates that the Locust sensor system would be most usable in a city driving environment, parking lot situations, and for driving in residential areas.