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클라우드 무선접속 네트워크에서 상향링크 채널 상태 정보를 이용한 핑거프린팅 기반 실내 측위에 관한 연구 시스템
우상우(Sangwoo Woo),이상헌(Sangheon Lee),문철(Cheol Mun) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.2
With 5G standards proceeding in earnest and increasing demand for services of indoor localization, research on indoor location recognition is being studied in various industrial fields, and research based on fingerprint recognition technology using Wireless Local Area Network (WLAN) is representative. In this paper, we propose an indoor positioning system based on fingerprinting technique that uses Cloud Radio Access Network (C-RAN) architecture and Channel State Information (CSI). In order to improve the performance in indoor positioning, we combined existing fingerprinting method and K nearest neighbor (KNN) technology which is one of the machine running technique. The performance improvements of the proposed indoor positioning system was verified by comparative experiments with the existing localization technique in a indoor localizztion testbed.
Wind Analysis and Site Assessment for Test Site of 3MW Wind Power System
우상우(Woo, Sangwoo),이기학(Lee, Ki-Hak),이상일(Lee, Sang-Il),박종포(Park, Jong-Po) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
A wind turbine power performance test is very important to wind turbine manufacturers because a wind farm developer or planner must want to define power performance characteristics and reliability of new wind turbines. Based on the IEC 61400-12-1, A wind turbine test site has to be nicely installed at flat terrain for testing. We are developing the wind power system which is IEC wind class IIa model with rated power of 3MW. KEPCO's Gochang power testing center was considered as candidates to build the test site without site calibration. This paper aims to verify the validity of the test site by using implement site assessment result that was based on IEC 61400-12-1.