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스테레오 영상에서의 그래프 컷에 의한 객체 기반 윤곽 추출
강태훈(Taehoon Kang),오장석(Jangseok Oh),이언석(Onseok Lee),하승한(Seunghan Ha),김민기(Mingi Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
오래 전 부터 영상처리와 컴퓨터 비전은 많은 분야에 응용되고 발전 되어 왔다. 그러한 기술 중에 최근 각광 받고 있는 그래프 컷 (Graph cut) 알고리즘은 에너지함수를 최소화 하는 가장 강력한 최적화 기법중 하나이다. 그리고 일반적으로 Sobel, Prewitt, Roberts, Canny 에지 (edge) 검출기 등은 영상처리에서 영상상의 에지를 검출하기 위해 이미 널리 사용되고 발전되어 온 기술이다. 물체에서의 윤곽만 검출하기 위해서는 우리가 원하지 않는 영상 위의 에지도 검줄되기 때문에 에지 검출기만으로는 물체의 윤곽만을 검출하는 것은 불가능하다. 우리는 물체의 윤곽만 검출하기를 원하기 때문에 그래프 컷과 에지 검출기의 알고리즘을 결합하면 이러한 문제를 해결 할 수 있다는 것을 제안한다. 이 논문에서는 그래프 컷 알고리즘과 에지 검출기에 관해 간략하게 기술하고 그 결과를 보일 것이다.
조용준(Yongjun Cho),윤해룡(Haeyong Yun),홍형길(Hyunggil Hong),오장석(Jangseok Oh),박희창(Hui Chang Park),강민수(Minsu Kang),박관형(Kwanhyung Park),서갑호(Kabho Seo),김순덕(Sunduck Kim),이영태(Youngtae Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.9
We developed a platform that was capable of autonomous steering in a furrow environment. It was developed to autonomously control steering by recognizing the furrow using a laser distance, three-axis tilt, and temperature sensor. The performance evaluation indicated that the autonomous steering success rate was 99.17%, and it was possible to climb up to 5° on the slope. The usage time was approximately 40 h, and the maximum speed was 6.7 ㎞/h.
A Study on Bird Deterrent System to Improve the Performance of Repelling Harmful Birds
Yongjun Cho(조용준),Haeyong Yun(윤해룡),Hyunggil Hong(홍형길),Jangseok Oh(오장석),Senongyong Woo(우성용),Suhwan Song(송수환),Dongwoo Kim(김동우),Minsu Gang(강민수),Kabho Seo(서갑호),Youngtae Lee(이영태),Jaedoo Jo(조재두) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8
We improved the sound pressure of the speaker and allowed the speaker to rotate 360 degrees to improve the effectiveness of the acoustic type bird repellent system. The prototype of the bird repellent system was developed by evaluating sound pressure characteristics by distance and direction and installing orchards. As a result of the evaluation, the extermination sound pressure increased from a distance of about 30 m to a maximum of 60 m, and through the rotary speaker, the extermination distance could be widened in all directions without specific direction.
밭 노지 작업을 위한 모듈형 농업 로봇 플랫폼 개선에 관한 연구
김동우(Dongwoo Kim),홍형길(Hyunggil Hong),조용준(Yongjun Cho),윤해룡(Haeyong Yun),오장석(Jangseok Oh),강민수(Minsu Gang),박희창(Huichang Park),서갑호(Kabho Seo) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.10
Our study introduces an improved modular agricultural platform to provide convenience to agricultural workers. We upgrade the platform design in three parts, namely, by adding a 458 pattern tire, electricity control, and four-wheel steering function, to improve the platform performance. Results showed that the upgrades enhanced the platform performance and reduced its overall weight as compared with the existing platform. To demonstrate the performance of our improved platform, we conducted five types of experiments with respect to the climbing angle, variable width, attitude control, speed, and obstacle passing.
권준혁(Junhyuk Kwon),이명호(Myungho Lee),조형호(Hyungho Cho),홍형길(Hyunggil Hong),조용준(Yongjun Cho),윤해룡(Haeyong Yun),오장석(Jangseok Oh),박희창(Huichang Park),강민수(Minsu Gang) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12
In this study, we developed an automatic module changer for agricultural implements for using in unmanned agricultural robots. An automatic module changer is attached by lowering from the top to bottom of the implements and fixing the four fastener bars attached to the implements in combination. The lift function was implemented using seesaw-type structures to keep the engagement point constant when the automatic module changer climbs and descends, and the switching function of the automatic module changer was implemented using the link device in the cam structure. We developed an algorithm to check the presence of attachment and opening/closing of the workpiece using limit switches and verified the performance through combination assessment and weight lift test to assess whether the combination was within the error range.