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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.
소형 디젤 차량에서 LNT 시스템 제어를 통한 DeNO<SUB>x</SUB> 효율 개선에 관한 연구
유선호(Sunho Yoo),전광민(Kwang Min Chun),송순호(Soonho Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Lean NOx Trap technology is a promising method to reduce nitrogen oxides in lean exhaust condition. The technology operates by storing NOx during lean exhaust conditions and then, under rich exhaust conditions, releasing and reducing the stored NOx to nitrogen. The reduction process is called regeneration and typically involves some additional fuel use or fuel penalty. In this study injection timing and injection quantity are optimized for minimize fuel penalty and maximize NOx conversion efficiency.