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실시간 임베디드 시스템에서의 YOLO 네트워크를 위한 필터 가지치기 기법 연구
고현준(Hyunjun Ko),김재명(Jaemyung Kim),박현재(Hyunjae Park),강진구(Jin-Ku Kang),김용우(Yongwoo Kim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Recently, object detection networks using Convolutional neural networks (CNNs) have shown outstanding performance in the field of computer vision. However, these networks consist of a large number of parameters and floating-point operations(FLOPs). Therefore, it is difficult to implement the CNN networks to real-time embedded systems such as cars or drones. In this paper, we implement target capacity filter pruning (TCFP) on YOLOv7 and YOLOv8 to reduce the number of parameters and FLOPs. In addition, we analysis networks performance on NVIDIA Jetson Xavier NX. As a result, inference time of YOLOv7 and YOLOv8 is improved about 11.4% and 19.2% on each networks and mAP(0.5:0.95) decreased only about 3.8% and 7% when pruning rate is 50% on COCO dataset.
고현준(Hyunjun Ko),김남열(Namyeul Kim),현정근(Jungguen Hyun),정우철(Woochul Jeong),강모원(Mowon Kang),김종형(Jonghyeong Kim) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.3-1
In general, manual wheelchairs have played important roles in moving patients from one place to another. However, patients have experienced discomfort getting on and off because of the need for physical assistance. This can be more serious if a patient has handicaps involving the arms or legs. In addition, it could be unpleasant for both the patient and assistant because of the need for extensive physical contact with each other. At times, a weak nurse feels that there is a risk when transferring a heavy patient from a bed to a wheelchair. In this paper, a new non-powered wheelchair is designed to assist in transferring a patient to their bed. This design considers the convenience of both the patient and assistant when the patient is transferred from a wheelchair to a bed and vice versa. The operation minimizes the physical contact between the assistant and the patient. The new wheelchair is also lightweight and portable compared with the normal popular wheelchair.
신동신(Dongshin Shin),고현준(Hyunjun Ko),김세형(Sehyung Kim),선지형(Jihyung Seon),윤상민(Sangmin Yoon),이진영(Jinyoung Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.12
This study reviews the discharge coefficient for thermal buoyancy natural ventilation through experimentation. We measure the air velocity at the outlet, which is needed to derive the discharge coefficient and to compare with the theoretical value. When a temperature difference exists between the inside and outside of the building, the measured discharge coefficient differs from the theoretical value with a maximum difference of 12%. The size and position of the openings have little effect on the discharge coefficient. For practical application, the theoretical discharge coefficient can be used with little modification.
효모에 발현된 북방수염하늘소(Monochamus saltuarius) Cellulase gene MsGHF45의 특성에 관한 연구
고현진 ( Hyeon Jin Ko ),고현준 ( Hyunjun Ko ),홍순관 ( Soon Kwan Hong ),박용철 ( Yong Chul Park ) 한국임학회 2016 한국산림과학회지 Vol.105 No.2
화석연료의 고갈 문제로 인하여 다양한 대체에너지가 개발 중이며 본 연구에서는 바이오에탄올 연구의 초석으로 사용하기 위해 곤충의 효소를 연구하였다. 북방수염하늘소(Monochamus saltuarius Gebler)가 지닌 cellulase (MsGHF45) 유전자를 Kluyveromyces lactis에 형질전환 시켰다. 형질전환 된 효모는 활성이 있는 cellulase 효소를 성공적으로 생산하였다. 재조합 MsGHF45의 분자량은 SDS-PAGE와 western blot을 통하여 확인하였다. 효소의 활성은 기질로써 carboxymethyl cellulose를 첨가한 native-PAGE를 통해서 검증하였다. 효소 활성의 최적조건을 알아본 결과, pH는 5에서, 온도는 40℃에서 나타났다. 바륨이온(Ba2+)과 철이온(Fe2+)은 효소활성을 저해하지 않았으나, 칼슘이온(Ca2+), 코발트이온(Co2+), 구리이온(Cu2+), 수은이온(Hg2+), 마그네슘이온(Mg2+), 망간이온(Mn2+) 그리고 아연이온(Zn2+)은 활성을 저해하였다. 특히, 수은이온은 효소활성을 66.5% 감소시켰다. 본 연구는 다양한 효소를 이용한 biofuel 연구에 참고자료로 사용될 것이다. In this study, the cellulase of Monochamus saltuarius (MsGHF45) gene was introduced in Kluyveromyces lactis, successfully. The molecular weight of recombinant enzyme was determined by SDS-PAGE and western blotting. The enzymatic activity was confirmed by native-PAGE containing carboxymethyl cellulose as a substrate. The optimul pH and temperature of recombinant MsGHF45 was pH5 and 40℃. The barium (Ba2+) and ferrous (Fe2+) enhanced enzyme activity, and the mercuty (Hg2+) inhibited its activity.