• Broadcasting and Media Magazine
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• v.27 no.3
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• pp.67-78
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• 2022

제조업과 같은 산업체에서는 현장을 이해하고 문서를 확인하는 과정에서 시간, 비용이 많이 소요되기 때문에 해석하기 용이한 3차원 형태의 데이터로 미리 제작하고 온라인으로 모델을 공유하고 수정하는 것은 작업 효율을 향상시킬 수 있다. 작업물을 3D 객체 형태로 분석하거나 수정 보완을 위한 가상 목업(mock-up)으로 활용할 경우, 3D 모델링을 빠르고 정확하게 생성하는 기술에 대한 연구가 필요하다. 본 논문에서는 2D CAD 이미지를 분석하여 도형 형태와 수치 정보를 각각 인식하고 3D 객체를 자동 생성하는 방법의 설계를 제안한다. 제안한 방식을 통해서 2D 이미지 파일의 별도 변환 없이 3D 객체로 자동 생성할 수 있다. 빠르게 자동 생성된 3D 객체는 XR 등의 다양한 플랫폼에서 정확하고 세밀한 형태를 가상 공간에서 공유할 수 있어 작업자 간 협업 효율성을 높일 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.627-628
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• 2021

본 논문은 제조 산업 현장에서의 업무 능력 향상을 위한 XR 교육훈련 콘텐츠의 가변적 시나리오를 제안한다. 가변적 시나리오를 적용한 XR 교육훈련 콘텐츠는 교육훈련 관리자가 자유롭게 시나리오를 가감할 수 있어 동일한 콘텐츠 내에서 다양한 시나리오로 콘텐츠를 구성할 수 있는 특징을 가진다. 이는 기존 하나의 시나리오로 반복되는 교육훈련의 한계를 해결할 수 있으며, 현장에서 발생할 수 있는 돌발적 상황 및 변화되는 업무 프로세스를 효과적으로 진행할 수 있을 것이다.

• Journal of the Korean Applied Science and Technology
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• v.38 no.2
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• pp.532-542
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• 2021

The purpose of this study was to investigate the body's strategy through kinematic variables of the lower extremities and ground reaction forces to maintain the club-head speed and ball accuracy despite the three stances during the golf swing. Ten male golfers who official handicap two were participate in the experiment. All subjects performed swing after maintaining the address posture according to stance conditions(square; SS, open: OS, closed: CS). Using a 3D motion analysis system and force plateform, the results were calculated with the 7-iron full swing each stance. In result, there was no difference in center of displacement, and left and right hip and knee joint angle displacement. Left ankle joint was largely plantar-flexed in OS, and right ankle joint was largely performed in CS from the address to the downswing. From address to take-back, right foot had a large left direction and the left foot had a right direction were greater in OS than in CS. Therefore, despite various stances, maintaining the same posture at impact is thought to have a positive effect on club head speed and ball direction.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.629-631
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• 2021

본 논문에서는 웹 기반 서비스 플랫폼 환경에서 3D 모델의 경량화 및 품질 유지를 위한 후처리 방법을 제안한다. 3D 모델을 산업 현장에서 다양한 용도로 활용되기 위해 웹 기반 환경에서의 3D 모델 시각화 서비스가 제공되고 있으며, 최적화된 서비스 제공을 위해 대용량 3D 모델의 경량화 및 품질 유지가 필수적이다. 제안하는 3D 모델의 후처리 방법은 간편한 사용자 조작뿐만 아니라 면의 경량화 가능 및 시각 품질을 유지할 수 있다. 이는 웹 기반 환경에서의 활용을 위한 대용량 3D 모델을 효율적으로 최적화하는 방안이 될 것으로 기대한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.650-651
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• 2020

본 논문은 YOLO v4 알고리즘을 이용하여 산업 현장에서 근로자의 개인 보호장비를 검출하는 방법을 제시한다. 학습데이터 주석은 사람 영역, 안전모, 안전 조끼 혹은 벨트 영역을 검출하도록 처리하였으며, 학습데이터 2,198개, 검증데이터 275개를 학습하는 데 이용하였다. 실험 결과 학습 반복 수 10,000번을 기준으로 81.81%의 mAP가 나옴을 확인하였다. 추후 정확도 개선을 위해 학습데이터 구축 및 전·후처리 알고리즘 관련 연구를 수행할 예정이다.

• Korean Journal of Applied Biomechanics
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• v.19 no.3
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• pp.449-455
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• 2009

The purpose of this study was to analyze the kinetics variables of GRF by dtance type during forehand stroke. Eight high school tennis players, who have never been injured for last six months, in Busan were chosen for the study. They performed horizontal swing and vertical swing that it was done each five consecutive trial in the condition of square, semi-open and open stance. It was filmed by 6 video camera and used with 3-dimensional motion analyzer system and GRF system. The following kinetic variables were analyzed in relation to left leg and right leg GRF. The conclusion were as follow: 1. In square and semi-open stances, the horizontal ground reaction force was decreased at impact in left leg regardless of swing type, whereas open stance was increased at impact to the tiptoe in both legs. 2. In square and semi-open stances, the vertical ground reaction force was increased at impact in left leg regardless of swing types, whereas open stance was decreased at impact to vertical direction in both legs.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.18-20
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• 2021

디지털 트윈 기술은 산업 분야와 관련된 방대한 데이터를 다루기 때문에 데이터에서 유의미한 인사이트를 도출하는 것은 매우 중요한 이슈이다. 그러기 위해서는 관리자가 데이터를 직관적이고 빠르게 해석하고 이해할 수 있어야 하며 그와 관련된 표출 기술에 관한 연구가 필요하다. 이에 본 논문은 현장에 대한 정확한 이해를 위해 전 산업 현장에서 공통으로 활용할 수 있도록 데이터를 초정밀로 표출하고 자동으로 디지털 트윈 가상 공간의 데이터 생성 및 저작이 가능한 서비스 플랫폼에 대해 논한다. 첫 번째, 데이터 초정밀 가시화를 위해 실사 영상 기반의 3D 가상 공간 및 현장 오브젝트를 자동으로 생성하여 표출하고, 저작 가능한 기술에 대해 논한다. 두 번째, 생성한 데이터를 서비스 하기 위한 경량화 표출 기술에 대해 논한다. 두 가지 기술 요소의 융합으로 디지털 트윈 가상 공간을 빠르게 생성하여 시간과 비용을 절감할 수 있고, 서비스 가능한 형태로 변환하여 광역 표출 확장성에 대한 효과를 검증하였다.

• Korean Journal of Applied Biomechanics
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• v.18 no.1
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• pp.147-158
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• 2008

The purpose of this study was to analyze the kinematical variables involved in two types of service motion in tennis pinpoint and platform stance, to find the fastest serving method. Seven skilled high school tennis players participated, and the kinematics were recorded by the Vicon motion analysis system. For the gathering and analysis of the data workstation, bodybuilder and polygon were used. During the back swing for the pinpoint stance, as the back leg moves forward the COM and the racquet moves more, thus taking 0.04 seconds longer than the platform stance. The body of the subject takes a bow-shape as the subject's foot moves back and their hip moves forward. This movement enables the subject to create more power during the backswing to impact. It also increases the spread of the COM racquet and the serve speed is increase. As there is no forward movement of the foot during the backswing of the platform stance, the COM and the racquet move less and thus the time required is shorter than that for the pinpoint stance by 0.04seconds. Similarly, the time spent creating the power for the serve is shortened, the COM racquet is narrower and the speed is lessened. However, the advantage of this serve is that it increases the stability.

• The Journal of the Korea Contents Association
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• v.15 no.8
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• pp.556-563
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• 2015

The purpose of this study was to analyzed body movement of the right and left directions relative to stance width. Seven college students(male, height $174.9{\pm}4.8cm$, weight $70.9{\pm}6.6kg$) participated in this study. For the purpose of this study, nine high-speed cameras and two force plates was utilized. Stance width was limited into small stance width(mean 42.9cm) and large stance width(mean 65cm). The results showed that (1) the small stance width took shorter time than the large stance during landing of the right feet to toe-off; (2) the small stance width was took longer movement of the right feet after split step comparing to the large stance; (3)there was no significant difference in the speed of center of gravity between toe-off and maximum speed; (4) the small stance width was greater angles to hip joint and knee joint during toe-off of the right feet comparing to the large stance; (5) the was no significant difference in values for force plates between the small stance and the large stance width during toe-off of the right feet.

• Korean Journal of Applied Biomechanics
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• v.18 no.2
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• pp.41-48
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• 2008

The purpose of this study was to analyze the lower extremities joint moment pattern by two types of service motion in tennis pinpoint and platform stance. Seven skilled high school tennis players participated, and the kinematics were recorded by the Vicon motion analysis system. For the gathering and analysis of the data Workstation, Bodybuilder and polygon were used. joint moments and Ground Reaction Forces for the phases involved were analyzed with the following results. There was a different moment pattern for the lower extremities between the two serve motions. For the platform stance there was only a large dorsal flexion moment but for the pinpoint stance there were other large moments. The flexion and maximum moment of the lower extremities occurred at the point of change from back swing and to the forward swing motion. Therefore, this data provides evidence that there is a high risk of injury at this point.