Panagiotis Theodorakopoulos

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We present a simple control strategy to visually track a ground target with a fixed wing UAV. The approach uses a lateral guidance law that aims at reaching a given target view angle, which is determined on the basis of simple geometric considerations. Simulations compare our approach with previous contributions in terms of target visibility ratio, and(More)
We present a control strategy that permits a fixed wing UAV to visually track a ground target. A pursuit-evasion strategy aims at optimizing the visibility of the pursuer UAV after having predicted the best action for the evading target. This is achieved by using two iterative methods that optimise various mission based criteria: obstacle avoidance and(More)
A single injection either of isotonic or hypertonic saline solutions protected rats against acute renal failure (ARF) induced with glycerol. This protection was accompanied by increased urinary prostaglandin E (PGE) concentration. On the contrary, a single s.c. injection either of hypotonic saline or isotonic glucose solution, which did not increase urinary(More)
Lung cancer is the most common cancer worldwide with 900,000 new cases each year in men and 330,000 in women, being also the major cause of death from cancer. In Greece about 4,000 persons die every year due to lung carcinoma. One of the major problems in the follow up of these patients is the difficulty of early detection of recurrent disease. Tumor(More)
Web-based teaching is one of the new directions for education. It has the advantage of being an anytime and interactive network, having high capacity and rich content environment, enhancing and facilitated independent learning and teacher-student communication. In this work we propose a Web-based learning environment for geography that provides geographic,(More)
Acknowledgements First of all, I would like to thank the Greek State Scholarship Foundation (I.K.Y.) for offering me the chance to prepare this Ph.D. in France, by financing this project. Secondly, I would like to express my gratitude to my supervisor, Simon Lacroix, whose great sense of humor, expertise, patience, warm leadership skills, and well-targeted(More)
The increase in solar ultraviolet radiation can have various direct and indirect effects on human health, like the incidence of ocular damage. Data of eye damage in residents of three suburban regions in Greece and in two groups of monks/nuns and fishermen are examined here. The statistics performed on these data provides new information about the plausible(More)
Mean blood pressure (MBP) was found to be lower, while renal plasma flow (RPF), glomerular filtration rats (GFR), sodium excretion rate (U(Na)V), potassium excretion rate (U(k)V) and urinary prostaglandin E (PGE) concentration were higher in 15 normotensive subjects (15NS) compared with the values obtained in 15 essential hypertensive patients (15EHP) of(More)
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