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조정태(Cho Jung Tae),이석원(Lee Seok Won),남부희(Nam Boo Hee) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
This paper describes the path planning method in an unknown environment for an autonomous mobile robot equipped with CCD(Charge-Coupled Device) camera. The mobile robot moves along the guideline. The CCD camera is used for the detection of the existence of a guideline. The wavelet transform is used to find the edge of guideline. It is possible for us to do image processing more easily and rapidly by using wavelet transform. We make a fuzzy control rule using image data as an input then determined the position and the navigation of the mobile robot. The center value of guideline is the input of fuzzy logic controller and the steering angle of the mobile robot is the fuzzy controller output. Some actual experiments show that the mobile robot effectively moves to target position by means of the applied fuzzy control.
하이브리드 로켓에서의 압력에 따른 연소특성에 관한 연구
조정태(Jung-Tae Cho),김기훈(Gi-Hun Kim),이정표(Jung-Pyo Lee),김학철(Hak-Chul Kim),박성우(Seon-Woo Park),박준형(Joon-Hyng Park),한희수(Hee-Soo Han),황재웅(Jae-Woong Hwang),문희장(Hee-Jang Moon),성홍계(Hong-Gye Sung),김진곤(Jin-Kon Kim 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
하이브리드 연소에서 연소실 압력에 따른 고체 연료의 연소 특성을 실험적으로 연구하였다. 본 연구는 낮은 산화제 평균 질량 유속구간에서 고체 연료 후퇴율이 산화제 유속 뿐만 아니라 연소실 압력에 영향이 있는지 실험적으로 확인하였다. 연료로 Poly-Ethylene과 산화제로 GOX를 이용하였으며, 동일 산화제 유속에서 연소실 압력 변화는 6mm,9mm의 노즐 목 직경으로 사용하였다. 낮은 산화제 질량 유속구간에서 고체연료 후퇴율이 산화제 유속뿐만 아니라 압력에 의한 영향이 있고, 동일 산화제 유속에서 압력이 증가 할수록 후퇴율이 증가함을 확인 하였다. The combustion characteristic of solid fuel with chamber pressure were experimentally studied in hybrid combustion. This paper was experimental confirmed whether solid fuel affected not only oxidizer mass flux but also chamber pressure. Poly-Ethylene(PE) was used as fuel, GOX was used as oxidizer. Chamber pressure was controled by nozzle throat diameter 6mm and 9mm. In low oxidizer mass flux, solid fuel regression rate was affected not only oxidizer mass flux but also chamber pressure. As well, the regression rate increase as chamber pressure increase with same oxidizer mass flux
PVDF와 PZT 混合材料의 電氣機械結合係數에 관한 硏究
趙廷台,李明敎 釜山工業大學校 1995 論文集 Vol.37 No.-
It has been known piezoelectric activity can be generated in synthetic polymer films subjected to a strong DC electric field at elevated temperatures. Polyvinylidene fluoride(PVDF) is best known and commercially most attractive which has been utilized as an active element in many applications ranging from infrared detector to ultrasonic transducers. Lead Zirconate-Lead Titanate(PZT) powders are made from the mole ratio of Pb(Mn1/3Sb2/3)0.08Ti0.49Zr0.425O3 by mixing PbCl2, ZrOCl2, TiCl4, MnCl2 and SbCl3. PVKF-PZT powders are mixed with aceton liquid and make of disc type in diameter 20mm, thickness 0.3mm by the pressure of 20dg/㎠. Poling is done by appling a strong electric field 20kV/cm. Dielectric constant of composite by the mixture ratio is about 30-50 and the value of electro-mechanical coupling factor k is 0.48.
조정태,이석원,남부희 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.B
This paper describes the path planning method in an unknown environment for an autonomous mobile robot equipped with CCD(Charge-Coupled Device) camera. The mobile robot moves along the guideline. The CCD camera is used for the detection of the existence of a guideline. The wavelet transform is used to find the edge of guideline. It is possible for us to do image processing more easily and rapidly by using wavelet transform. We make a fuzzy control rule using image data as an input then determined the position and the navigation of the mobile robot. The center value of guideline is the input of fuzzy logic controller and the steering angle of the mobile robot is the fuzzy controller output. Some actual experiments show that the mobile robot effectively moves to target position by means of the applied fuzzy control.