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 association between increased levels of solar ultraviolet radiation, air-pollution at ground level, and the development of ocular defects.
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 results obtained during flight tests are presented.
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