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A sow has a characteristic changing in its temperature. It is a suitable time that is decreasing after sow's body temperature increased to the highest point. We observe the variation of temperature through USN(Ubiqutous Sensor Network) system using wireless sensor inserted in the womb. The wireless sensor send massage to user's server and its server send SMS massage to user's cell phone. We contribute to user's income increase as it notice to suitable fecundation.Key Words : Fecundation, USN(Ubiquitous Sensor Network), Wireless sensor, Tiny-OS, NesC *  : (myki@bu.ac.kr) 09 12 18  10 01 11  10 01 20 1.             USN   ,                   USN   . USN               .  USN     , , ,     . USN         .

A Study on Alarm System of a right Fecundation time for a Sow Using Ubiquitous Sensor Network(USN)