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Unscented 칼만 필터 기반의 chirp spread spectrum 노드 위치 추정
조현우(Hyeonwoo Cho),반성준(Sung Jun Ban),이영훈(Younghun Lee),전용주(Youngju Joen),김상우(Sang Woo Kim) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.5
Position estimation in indoor is significant problem, because GPS which is usually used for outdoor positioning cannot be utilized to indoor positioning. Sensor network can be a solution for the positioning. Recently, chirp spread spectrum (CSS) specified in IEEE 802.15.4a provides an ability of ranging. Based on the results of the ranging, a position of a C55 node can be calculated by using trilateration. In this case, Kalman filter can be applied to the trilateration because of the measurement noise. In this paper, we apply the unscented Kalman filter for the trilateration. The trilateration can be represented to a nonlinear state space equation, and the unscented Kalman filter is suitable for nonlinear state space equation. Through the experimental results. we show the accuracy of the estimated position.
태그 수 추정을 이용한 ALOHA 기반의 RFID 충돌방지 알고리즘
조현우(Hyeonwoo Cho),이창우(ChangWoo Lee),반성준(Sung Jun Ban),김상우(Sang Woo Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
확률적(stochastic) RFID 충돌방지 알고리즘은 둘 이상의 태그가 리더기의 인식범위 내에 있을 경우 태그들이 동시에 리더기의 질의에 응답함으로서 발생하는 충돌을 확률적으로 감소시켜, 정확하고 빠르게 다수의 태그를 인식하기 위한 알고리즘이다. 본 논문에서는 확률적 충돌방지 알고리즘 중 하나인 dynamic framed ALOHA를 기반으로 새로운 태그 수 추정 방법을 이용한 RFID 충돌 방지 알고리즘을 제안하였다.
C-Hook 인식을 위한 RFID 시스템의 적용 가능성에 대한 연구
이창우(Chang Woo Lee),조현우(Hyeonwoo Cho),반성준(Sung Jun Ban),권영신(Yong Sin Kwon),김상우(Sang Woo Kim) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.1
C-Hook is a kind of conveyer system for transporting steel coil in POSCO. To detect the current position and the trajectory of steel coils in a plant, C-Hooks are tracked by an inspection system based on PLC. The inspection system detects transit of C-Hooks by monitoring a physical contact between steel bars on a C-Hook and the inspection sensors. However, this system is not reliable because of the abrasion, damage and aging. Moreover, the number of distinguishable C-Hooks is limited by the number of combination of steel bars on a C-Hook. It means that more steel bars should be installed for distinguishing the more C-Hooks. Therefore, the conventional system is difficult and expensive to maintain. To overcome these problems, we propose a C-Hook identification system that uses RFID which is a non-contact type identification system, and evaluate its performance and applicability from a new monitoring program that operates along with the conventional system in the real environment of POSCO.
선재 공정에서 C-Hook 트래킹을 위한 RFID 시스템 적용에 대한 연구
권영신(Young Sin Kwon),이창우(ChangWoo Lee),반성준(Sung Jun Ban),조현우(Hyunwoo Cho),김상우(Sang Woo Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Wire rods are carried by C-Hooks and are tracked by bringing the inspection sensors into contact with steel bars on the C-Hooks. However, the conventional system using mechanical equipment is not reliable due to aging, wearing and bending of steel bars. To overcome these problems, a non-contact type identification system is required. This paper introduces the radio frequency identification(RFID) technology which is one of the most popular non-contact identification methods, and evaluates its performance in the real environment of POSCO. Specifically, we use tags which are designed for operating on high temperature and allowing easy attaching and detaching on the C-Hook. A new monitoring program is developed for reacting upon the conventional system and showing the results of reading tags.