seoul national university snu snu ux lab 유지형 alan yoo user experience local search user study location-based search mobile local search foursquare ux describing places place search navigation walking experience 서울대학교 ux lab human factors mobile jamie teevan opportunities exist david dearman place location sharing spatial behaviour chi2011 space chi human factor hci spatial meaning context-aware spatial knowledge place discovery traffic tom vanderbilt gangnam kevin lynch 강남 the image of the city the driver-car automobilities tim dant
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