leskovsek's Articles in Izobraževanje, znanost

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Slepo razločevanje akustičnih signalov s pomočjo statistike (cocktail party problem) Namen naloge je opisati problem mešanja akustičnih signalov in obrazložiti teoretično ozadje postopkov za njihovo ločevanje. V nalogi bom zagovarjal tezo, da postopki ločevanja delujejo zgolj zaradi fizikalnih omejitev virov signalov (bodisi akustičnih, EEG, EMG, ...) pri računalniško generiranem naključnem signalu pa popolnoma spodletijo. Sprva se bom lotil statistične analize posameznih akustičnih signalov in njihove trenutne mešanice, ter jih primerjal s računalniško generiranimi naključnimi Električno polje nizkih frekvenc in vpliv na biološke procese Abstract This seminar is a brief introduction to electric field of low frequencies and its influence on biological tissues and processes. Electromagnetic field consist of magnetic and electric component, which have different interaction on biological systems. With development of technology the number of artificial sources of EM fields has risen and today humans are exposed to EM fields every day. Question, which has arised is how does this field interact with humans and other biological system. Electrotherapy as an alternative treatment of cancer (meta analysis) Electrotherapy is a therapeutic approach that consists of applying direct current electric pulses accross the tumor area. The treatment is also being reffered to as "direct current treatment" or "electrochemical treatment". Electrochemotherapy - therapeutic approach providing delivery into cell interior of nonpermeant drug Electrochemotherapy is a therapeutic approach providing delivery into cell interior of nonpermeant drugs with intracellular targets.[1] It is based on the local application of short and intense electric pulses that transiently permeabilize cell membrane, thus allowing transport of molecules otherwise not permitted by a cellular membrane. Presently, applications for cancer treatment have reached clinical use (antitumor electrochemotherapy using bleomycin or cisplatin). Electrochemotherapy with bl D/A pretvorba: Pregled možnih izvedb in njihove prednosti ter slabosti Digitalno analogna pretvorba je postopek pri katerem poljuben digitalni signal (največkrat binarno kodo) pretvorimo v ustrezen analogni signal (tok, napetost ali električni naboj), katerega lahko naknadno ojačujemo in z njim krmilimo močnostne porabnike. Pri digitalno analogni pretvorbi se največkrat poslužimo sledečih principov generiranja analognega signala:

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