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비전 인식 기반의 검사 기능을 갖는 FDM 방식 3D 프린터 시스템 개발
송순호(Sunho Song),이해연(Hae-Yeoun Lee) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.10
3D printing is a popular technology that allows anyone to quickly and easily create products at home or office, but product errors can occur due to various causes during time consuming and expensive 3D printing. In this paper, In this paper, we describe the development of an FDM type 3D printer that improves performance by inspecting in real-time through vision recognition to determine whether errors occur during 3D printing. A system structure for error inspection and control and a vision recognition algorithm that detects errors by comparing real-time acquired images and expected model output images are presented. Also, since recognition errors may occur due to reflection of external lights during actual printing, a stable image acquiring method using shielding and LED lighting is explained. An FDM type 3D printer with vision recognition based inspection function was developed, and through performance analysis, it was confirmed that 100% recognition is possible in abnormal printing whose size is 2mm or more.
Model soot이 Pt/CeO₂ 촉매와 tight contact한 상태에서의 O₂에 의한 산화특성 연구
송창훈(Changhoon Song),이동일(Dongil Lee),김태수(Taesoo Kim),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The catalytic behaviors of Pt/CeO₂ have been studied for soot oxidation by O₂. Oxidation of soot (carbon black) is studied using a flow reactor system simulating the condition of diesel exhaust. In this study, the temperature programmed oxidation (TPO) scheme is used. And soot oxidation rate is evaluated by monitoring both CO and CO₂ concentrations. Pt/CeO₂ catalyst shows promising performance to accelerate the soot-O₂ reaction. Under tight contact condition with catalyst, soot oxidation reaction occurred more actively. The maximum soot oxidation temperature is decreased by about 150℃. The main reason that causes the increase of soot oxidation activity is the active oxygen from cerium oxide.
박성호,이충일,송순호,김용준,Park, Sung-Ho,Lee, Chung-Il,Song, Soon-Ho,Kim, Yong-Jun 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.2
This paper presented a low-cost thick film gas sensor module, which was based on simple PCB (Printed Circuit Board) process. The proposed sensor module included a $NO_2/H_2$ gas sensor, a relative humidity sensor, and a heating element. The $NO_2/H_2$ gas and relative humidity sensors were realized by screen-printing $SnO_2,\;BaTiO_3$ nano-powders on IDTS (Interdigital Transducer) of a PCB substrate, respectively. At first 1% $H_2$ gas flowed into the sensor chamber. After 4 min, air filled the chamber while $H_2$ gas flow stopped. This experiment was performed repeatedly. The Identical procedure was used for the $NO_2$ detection. The result for sensing $H_2$ gas showed the increase of voltage from 0.8V to 3.5V due to the conductance increase and its reaction response time by hydrogen flow was 65 sec. $NO_2$ sensing results showed 2.7 V voltage drop due to the conductance decrease and its response time was 3 sec through a voltage monitoring. 간단한 PCB 공정을 기반으로 하여 저가형의 후막 가스 센서 모듈을 제안하고자 한다. 제안된 센서 모듈은 $NO_2/H_2$ 가스 센서와 습도센서, 그리고 히터를 포함한다. $NO_2/H_2$ 가스와 상대 습도 센서들은 각각 $SnO_2$와 $BaTiO_3$ 나노 입자들을 PCB 기판에서의 IDT(interdigital Transducer)에 프린팅 함으로써 제작되었다. 처음에 1% $H_2$ 가스를 센서 쳄버에 공급하고 4분 후 $H_2$가스 공급을 멈추고 공기를 주입시켰으며, 이러한 동작을 반복적으로 수행하였다. 마찬가지로 $NO_2$로 감지하도록 같은 동작을 실행하였다. $H_2$ 가스에 대한 결과는 도전성의 증가로 인하여 0.8V에서 3.5V로 증가함을 볼 수 있었으며, $H_2$ 가스를 주입한후의 반응 시간은 65초였다. $NO_2$ 가스의 경우는 도전성이 감소함으로써 2.7 V의 전압강하가 일어 났으며, 반응시간은 3초였다.