Samsung Electronics Co., Ltd.

Seoul National University

Sunkwang Lightning Protection Technical Institute Inc.

Sang-Won Seo

Dong-hyun Kim

Jae-geol Cho

Dong-Jin Kim

Yong-Su Kim

Jung-taek Oh

Sang-bae Park

Hyun-Jae Baek

Byung-hun Choi

Do-yoon Kim

Da-Woon Jung

Kwang-Suk Park

Byeong-U Kim

Hee-Soo Park

Hee-Nam Yoon

Sang-Ho Choi

Won-Sung Kwon

Su-Hwan Hwang

Jae-Hyo Park

Kyung-Hoon Jang

Kwang-Yeop Jang

An apparatus for estimating the lifetime of a surge protective device (SPD) using the discharge characteristics of a metal oxide varistor (MOV) includes an MOV having an input terminal and an output terminal; an impulse voltage application unit applying an impulse voltage for MOV test to the input terminal of the MOV; a discharge current measurement unit; a first switching unit connecting a power line to the input terminal of the MOV; a second switching unit connecting a ground line to the output terminal of the MOV in the normal mode and selectively connecting the discharge current measurement unit in the MOV test mode; an MOV test management unit providing information; a discharge current check unit generating an MOV abnormal signal; and an MOV state display unit displaying an MOV abnormal signal.

Apparatus for estimating lifetime of the SPD using discharge characteristics of the MOV

Disclosed is a method for an electronic device. The method may include: acquiring a galvanic skin response; generating a first parameter for a first interval and a second parameter for a second interval based on the galvanic skin response, the second interval being an interval before the first interval; determining a first threshold corresponding to the first interval based on the second parameter; and determining an activity state of the first interval based on the first threshold and the first parameter corresponding to the first interval.

Electronic device for determining sleep state and method of controlling same

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Seoul, South Korea

Sang-Won Seo