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Sometimes we are worried whether we lock the door after rushing out of the house. To prevent this, we suggest "Signkey" design,
which makes it possible that we can check whether we lock the door by seeking a part of the key pushed into a door knob.
Hoseo university
Seoul, North Korea
Hoseo university
Asan, North Korea
Hoseo university
Seoul, North Korea
youngjin Jang
daeun Kim
hyungjoo Kang