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황규현(Gyuhyun Hwang),박상훈(Sanghun Park) 한국정보과학회 2012 정보과학회 컴퓨팅의 실제 논문지 Vol.18 No.12
본 논문에서는 사용자 친화적인 증강 비디오 합성 및 편집 시스템을 제안하고, 시스템을 구성하는 핵심 기능들과 각 기능들을 위한 그래픽 사용자 인터페이스(GUI)에 대해 설명한다. 핵심 기능들은 크게 비디오기반 모델링, 조명 추정 및 그림자 생성, 그리고 동적 영상기반 조명과 렌더링으로 구성되며, 복잡한 수작업과 숙련도를 요구하지 않는 사용자 친화적인 GUI를 구현함으로써 사용자의 간단한 조작만으로 사실적이고 자연스러운 합성 및 편집 결과를 얻을 수 있도록 설계하였다. 본 논문에서는 제안된 시스템의 각 기능들에 대해 구체적으로 설명하고, 이를 이용한 실험 결과를 통해 제안된 시스템을 이용해 효과적인 비디오 합성 및 편집이 가능함을 증명하고자 한다. In this paper, we propose a novel user-friendly augmented video compositing and editing system, and we present core functions and GUIs implemented in the system. The core functions consist of image-based modeling, light estimation and shadow generation, and dynamic image-based lighting and rendering. Since the user-friendly GUI dose not require complicate manipulation or special skill level, it enable users to create composed and edited photo-realistic videos by quite simple operation. We present the details of the functions, and show that the system efficiently allows the user to compose and edit given videos.
차량 구조강성 및 보행자 머리 상해를 고려한 Hood 형상 최적화
황규현(GyuHyun Hwang),홍정화(JungHwa Hong),고은영(EunYoung Ko),임광배(GwangBae Lim),김훈희(HunHee Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recently pedestrian’s safety has been a major problem in the automobile industry. It became important as well as driver’s safety. Crashing with car causes the dangerous factors, especially to child because of these factors, some countries like Europe, USA and Japan has already established their own rule of safety for pedestrian and implemented it. In this study, we change the shape of hood inner panel to reduce HIC of child pedestrian. We applied EuroNCAP on our study. We determined only the middle range of hood among WAD’s 1000 to 1250 because our model is the compact car. This study’s object is reduction of HIC. So we figured out the number of optimal ribs, and applied design of experiment (DOE) to find optimal rib shapes. Then we applied hole and change of the hood side shape to reduce HIC of child head injury. In addition, only for considering the design of pedestrians safety might cause structural problem as for this problem we have simulated the structure of hood for all kinds of possibilities.
보행자 두부 상해치 감소를 위한 자동차 Hood Rib의 형상 최적화
황규현(GyuHyun Hwang),표정현(JungHyun Pyo),홍정화(JungHwa Hong),고은영(EunYoung Ko),김훈희(HunHee Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The head injury takes one of the highest percentages of pedestrian injuries when a car to pedestrian accident occurs. So in this research, we handled the compact car model as a case and chose the child pedestrians as for the subject who are weakest traffic accidents. We have applied EuroNCAP and progressed the head impact test and also applied the shape optimization on the hood inner panel which influences significantly to pedestrian’s head injury criteria. The method is changing the number of hood inner’s ribs to figure out the effect and found the correlation between shape of rib and HIC. The number of optimal ribs is selected for the durability of hood and balance of car as a symmetrical shape. The sensitivity analysis have progressed by using fractional factorial design and applied central composite design to achieve the optimal shape of rib.
중심합성계획법을 이용한 보행자 HIC 영향에 대한 연구
표정현(JungHyun Pyo),황규현(GyuHyun Hwang),김훈희(HunHee Kim),고은영(EunYoung Ko),홍정화(JungHwa Hong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Since the regulation for pedestrian protection was announced in Europe, both the passive and active systems for pedestrian protection have been investigated in motor industries and they are still continuing. Especially, the regulations of fatal head injury that could cause a pedestrian death were commonly included in the Euro Phase I, Ⅱ, and GTR(global technical regulation). Also these regulations are expected to be getting stricter. Generally, a hood-lifting system is well-known for typical active system that is related with a head injury. It was proved that the vehicle with this hood-lifting system causes massive HIC(head injury criterion) reduction comparing to one without the hood-lifting system. However, more advanced researches are still required on these active systems because the advanced researches could increase the stability and reduce the cost at the same time. On the other hand, although this passive system, which is related to its structure and material, shows relatively less HIC reduction, this system still preferred because of its strong stability and low-cost. In order to apply the passive design to the pipeline immediately, a simple design change method of the passive hood system was considered in this study. This study analyses the effect of the hood inner and hood outer with respect to pedestrian protection. The test condition was EuroNcap regulation. Then, the RSM(Response Surface method) was applied to optimization problem, and find the optimal thickness. In this study, it is the relationship between hood thickness and HIC (head injury criteria) for child headform-to-hood impact by investigating the analysis result.
과학적 가시화 어플리케이션을 위한 VR Juggler 기반 가상현실 인터페이스 개발
구기범(Gibeom Gu),황규현(Gyuhyun Hwang),허영주(YoungJu Hur) 한국정보과학회 2016 정보과학회 컴퓨팅의 실제 논문지 Vol.22 No.10
이 논문에서는 대용량 해석 데이터 가시화 시스템을 위한 가상현실(VR) 인터페이스의 세부적인 개발내용에 대해 설명한다. 여기서 소개하는 VR 인터페이스는 오픈소스 VR 프레임워크인 VR Juggler에 기반을 두고 있다. VR Juggler는 여러 장점에도 불구하고, 이벤트 드리븐 방식을 지원하지 않으며 클러스터 환경에서 실행될 때 노드 사이의 동기화가 제한적으로 지원되는 등 한계를 보여주기도 한다. 이 논문에서는 이벤트 처리, 애니메이션 재생이나 외부 서버와의 통신 시 클러스터 노드 간 동기화 및 데이터 공유와 같이 VR Juggler를 이용해서 어플리케이션을 개발할 때 발생하는 문제의 해결방안을 실제 개발사례와 함께 제시한다. 그리고 가상현실 입력장치의 단점을 보완한 스마트 디바이스 기반 인터페이스에 대해서도 소개하며, 외부 사용자를 대상으로 진행한 사용성 평가결과를 통해 VR 인터페이스와 스마트 디바이스 인터페이스의 유용성을 검증한다. In this paper, we introduce a virtual reality interface for scientific visualization applications. Our VR interface is based on an open-source framework called VR Juggler. Although VR Juggler has its own advantages, it lacks some of the important functionalities needed for practical applications - event handling, synchronization and data sharing among cluster nodes, to name a few. We explain how these issues are resolved while developing the VR interface. Also, a new interface with a smart device, which replaces the virtual reality input device, is introduced. Finally, system usability test results are provided to prove the effectiveness of the proposed interfaces.