Abstract: Provided is a technology for increasing accuracy of position estimation by estimating a position of a signal source based on an error due to altitudes of a sensor and a signal source and an error due to a pitch of an aircraft as well as an error due to curvature of the earth. At this time, a position estimation method may include receiving measurement data from a plurality of sensors, estimating first position data of the signal source based on the measurement data, identifying an altitude error of the first position data, and estimating second position data that is data obtained by correcting the first position data based on the altitude error.

Abstract: The present invention relates to a composition for preventing or treating obesity containing an ethanolic extract of Ramulus mori as an active ingredient. As the present invention contains an ethanolic extract of Ramulus mori, extracted from natural substance Ramulus mori, as an active ingredient, the present invention may prevent or treat obesity by inhibiting lipid accumulation in adipocytes without any side effects to a human body and inhibiting preadipocytes from being differentiated into adipocytes.

Abstract: The present invention relates to a composition for preventing or treating obesity containing an ethanolic extract of Ramulus mori as an active ingredient. As the present invention contains an ethanolic extract of Ramulus mori, extracted from natural substance Ramulus mori, as an active ingredient, the present invention may prevent or treat obesity by inhibiting lipid accumulation in adipocytes without any side effects to a human body and inhibiting preadipocytes from being differentiated into adipocytes.