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지상장애물 회피를 위한 항공기 경고 시스템에 관한 연구
함광근,최재덕,허웅 한국항공운항학회 1997 한국항공운항학회지 Vol.5 No.1
본 연구에서는 항공기의 지상활주에 필요한 측방 경보장치를 구현 하였다. 장치는 장애물 검출부, 송신부, 수신부, 그리고 경보부로 구성하였다. 장애물 검출부는 40KHz대의 초음파에 의한 펄스비행법을 채택하였고 송/수신부는 447 MHz 대의 RF모듈을 사용하였다. 경보부는 컴퓨터를 사용하여 수신된 거리 데이터로부터 경보를 한다. 검출장치는 주날개의 좌우측 끝과 수평 안정판의 좌/우측 끝에 장착한다. 장애물 검출거리는 10m로 설정하였다. 실험 결과 만족한 결과를 얻을 수 있었다. in this study, we deviced side warning system that is necessary to the ground operation of aircraft. The system consist of obstacle detection part, transmission part, receive part, and warning part. We used TOF(Time Of Flight) method using 4OkHz ultrasonic wave as the obstacle detection part. The 447MHz RF module was applied to the transmission and receive part. The warning part is activated by the computer using received distance data. The detection system attach to the left/right side edge of main wing and horizontal stabilizer. We have decided 10x11 obstacle detection range. The result of expriment was satisfaclory.
經皮電氣刺戟을 위한 强度,周波數,듀티비 效果에 관한 硏究
함광근,허 웅,이호재,민홍기 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-
In this paper, we have searched for the optimal electro-stimulation condition which for the electrotactile matrix device. The required parameters of electro-stimulus condition for the experiments are waveforms, frequency stimulation intensity, duty ratio. As a result, when we gave a stimulation to finger's skin with monophasic, biphasic and differential phasic waveform, the most appropriate stimulation condition was 200 to 250[Hz] in frequency, 10 to 25[%] in duty ratio. A Burst type pulse was more sensitive than that of the continuous pulse.
양승열,함광근,허웅,강면규 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
In this paper, we study about obstacle detection system of the ultrarsonic crane for the blind walking. We sense a restrictive object by FMCW method for forward direction and pulse method for other direction. The system is composed of hardware system and software system. The hardware system consists of FMCW unit pu1se, unit control unit, and sound generation unit. The software system consists of front direction measuring routine, 1eft/right measuring routine, lower up/down routine. We develope the u1trasonic distanice sensor to measur the distance between 50㎝ and 500㎝. We obtained very accurate result for hard material and obtain satisfactory results for the dressed The system detected up to 5m for hard surface material and up to 2m the man. This system produce a beep sound forthe blind of which frequency corresponds to the obstacle distance.
허웅,함광근,한상휘,서동선 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
In this paper, we implemented a ultrasound side warning system for safetely lane change of a car. The implemented system are consist of ultrasound sensor, transmision and receiving module, controller and alarming and displayer. The system control software and alarming algorithm are embeded in micro-controller memory. We use a pulse time of flight method to detect obstacle in the lane and it can detect within 3 meter range. The system provide two kinds of alarming, light and sound, for safety lane change to the driver. At the real car experiment, we can have good result that satisfy design specification.