Mr. Yoshiaki Sakagami received his Bsc degree in meteorology at University of Sao Paulo, and Master in mechanical engineering from the Department of Mechanical Engineering at University of Santa Catarina State, Brazil. Mr. Yoshiaki is professor at Federal Institute of Santa Catarina State, PhD student at Federal University of Santa Catarina State, and has long experience with field experiments. His expertise is mainly in meteorological instruments and wind energy. His present work focuses on wind energy and he is concerned with the effects of atmospheric stability and turbulence in the wind turbine power performance.