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프로산하 유소년축구클럽 선수와 일반중학교 축구선수의 자기관리와 스포츠자신감 및 선수생활만족도 차이분석
고현준(Ko, Hyun-Jun),박영환(Park, Young-Hwan),최옥진(Choi, Ok-Jin) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.4
The purpose of this study was to analyze the difference of self - management, self - confidence of athletes, life satisfaction of athletes between youth soccer club players under professional teams and general middle school soccer athletes. First, the interpersonal management, mental management, and training management as the sub - factors in the self - management showed higher in the youth soccer club players. It was a statistically significant difference. However there was no statistically significant difference in body management. Second, the coach leadership, physical and mental preparation, ability demonstration and social support as the sub - factors in the athletic self - confidence showed the higher level in the youth soccer players, but there was no statistically significant difference. Third, social satisfaction, athletic satisfaction, and environmental satisfaction as the sub - factors in the athletic life satisfaction were higher in youth soccer club players and statistically significant differences were also found.
단상 부스트 PFC 컨버터의 제어 기법 리뷰: 평균 전류 모드 제어, 예측 전류 모드 제어 및 모델 기반 예측 전류 제어
고현준(Hyeon-Joon Ko),최영준(Yeong-Jun Choi) 한국컴퓨터정보학회 2023 韓國컴퓨터情報學會論文誌 Vol.28 No.12
부스트 PFC (Power Factor Correction)컨버터는 AC 입력 전류의 단일 역률과 낮은 THD (Total Harmonic Distortion)를 달성하기 위해 다양한 제어기법들이 연구되고 있다. 그중 인덕터 전류의 평균값을 전류지령에 추종하도록 제어하는 평균전류 모드 제어가 있으며 가장 널리 사용되고 있다. 하지만, 오늘날 디지털 프로세서의 발달로 고도화된 디지털 제어가 가능해지면서 부스트 PFC 컨버터의 예측제어가 관심을 받고 있다. 예측제어에는 예측 알고리즘으로 듀티를 미리 생성하는 예측전류 모드 제어 및 모델을 기반으로 한 비용함수를 선정하여 스위칭 동작을 하는 모델예측제어로 분류된다. 따라서 본 논문에서는 부스트 PFC 컨버터의 평균전류 모드 제어, 예측전류 모드 제어, 모델예측 전류 제어를 간단히 설명한다. 또한, 시뮬레이션을 통해 전체 부하 및 다양한 외란 조건에서의 전류 제어를 비교 분석한다. For boost PFC (Power Factor Correction) converters, various control methods are being studied to achieve unity power factor and low THD (Total Harmonic Distortion) of AC input current. Among them, average current mode control, which controls the average value of the inductor current to follow the current reference, is the most widely used. However, nowadays, as advanced digital control becomes possible with the development of digital processors, predictive control of boost PFC converters is receiving attention. Predictive control is classified into predictive current mode control, which generates duty in advance using a predictive algorithm, and model predictive current control, which performs switching operations by selecting a cost function based on a model. Therefore, this paper simply explains the average current mode control, predictive current mode control, and model predictive current control of the boost PFC converter. In addition, current control under entire load and disturbance conditions is compared and analyzed through simulation.
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(Hyun-Jun Ko),송춘삼(Chun-sam Song),김종형(Jong-Hyung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper introduces an working robot. four leg Walking type robot most of the existing problems at the walk, move the center of weight due to instability of posture. To compensate for these drawbacks, the structure of the leg design to rotate the joints and the joints, walking a straight line and at the same time, move the robot joints, linear joints and rotation changes in weight by almost do not occur, the body with balance and walking. Because of this, one side of the leg to be damaged, three leg is safety walking.