정언화

Cctv camera device and server of safety management center using location based service, intelligent security system using the same and method thereof

박우영, 박준용, 구윤회, 2009 .

System and Method for Navigation Service Using Mobile Identification Number

이재영, 김영우, 이재승, 2003 .

Indoor positioning system using gps and indoor positioning method using gps

이기주, 한규영, 이경배, 2008 .

Multimedia Advertisment Service Method and Mobile Terminal Controlling Apparatus and Method for the service in mobile communication network

김준형, 홍성철, 김경석, 2002 .