In this chapter a technology for the enhancement of video data obtained at low light levels is presented. The method was inspired by the way in which nocturnal animals adaptively sum intensities, spatially and temporally, to improve vision at night. Due to the low photon count under these conditions the visual input is dark and unreliable, which leads to noisy low contrast images. The noise become

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Trellis quantization is a finite state machine based method for data compression. It is mainly applied to quantizing noise-like sources. In this thesis new trellis codes suitable for low rate quantization are derived. Rate-distortion theory predicts source coding performance, but unfortunately provides only limited insight in how to construct good codes. In general, good trellis source codes combi

Charles Chaplin discussed in his films from the late 1930s and early 1940s modernity and ideology. With examples from Modern Times, The Great Dictator and Monsieuer Verdoux, I discuss different interpretations and some reactions to these films.

Popular Abstract in Swedish Grupp A streptokocker (GAS) ger upphov till infektioner lokaliserade till svalg och hud såsom akut pharyngotonsillit (halsfluss), impetigo (svinkoppor), erysipelas (rosfeber) men även till invasiva (djupa) infektioner med allvarlig prognos, speciellt scarlatina (scharlakansfeber), puerperalfeber (barnsängsfeber), nekrotiserande fasciit och andra mjukdelsinfektioner samtGroup A streptococci (GAS) cause throat and skin infections, severe invasive diseases as well as the non-suppurative complications acute rheumatic fever and glomerulonephritis. GAS have retained susceptibility to betalactam drugs, but resistance to alternative antibiotics is of concern. In a large Iranian survey the carrier rates among symptom-free children and those with pharyngotonsillitis were

Popular Abstract in Swedish Laddade partiklar är kända för att sända ut ljus när de rör sig i en krökt bana. Detta ljus kallas synkrotronljus och upptäcktes i mitten av 1900-talet. Sedan dess har det använts i forskning inom kemi, biologi, medicin och materialvetenskap. Utveckling av speciella maskiner för att producera synkrotronljus blev nödvändig för att fortsätta att tillgodose behoven inom deTo ensure the beam with an ultralow emittance and high current the possible effects deteriorating the beam stability must be investigated. When ultrarelativistic particles travel in the vacuum chamber they induce electromagnetic fields which can act back on them and the following particles. The interaction of the beam with the surrounding environment can be described by wakefields in time domain a