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몰입형 문화유산 현장 교육을 위한 VST-HMD 기반 XR 체험 프레임워크 제안
권오양(Oh-Yang Kwon),유정민(Jeong-Min Yu) 한국컴퓨터정보학회 2020 한국컴퓨터정보학회 학술발표논문집 Vol.28 No.2
본 논문에서는 문화유산 현장에서의 몰입형 교육을 위한 VST(Video See-through) 방식의 HMD(Head Mounted Display) 기반 XR(eXtended Reality) 체험 프레임워크를 제안한다. 매장문화재적 요소가 강한 문화유산 현장의 경우 실물이 남아있지 않아 교육 및 체험 측면에서 흥미로운 정보 전달이 어렵다. 최근 모바일 기기의 대중적인 확산에 따라 이를 이용해 문화유산 현장에 소실된 문화유산을 AR(Augmented Reality)로 복원 및 시각화하거나 관련 정보를 제공하는 연구들이 이루어졌으며, 나아가 OST(Optical See-through) 방식의 안경형 AR 디스플레이를 활용하는 사례들도 등장했다. 그러나 이러한 연구들은 기기의 특성으로 인해 몰입감과 사용성 측면에서 한계점을 보였으며, 단순히 소실된 문화유산의 복원된 모습을 정적으로 시각화하는 것에 그쳐 문화유산 현장에 내재된 동적인 역사 스토리를 재현한다는 측면에서 부족한 점이 있었다. 본 논문에서는 문화유산 현장에서 VST-HMD를 이용하여 AR 기반의 정적 문화유산 시각화뿐만 아니라 VR(Virtual Reality) 기반의 동적 역사 스토리 애니메이션을 제공하는 XR 체험 프레임워크를 제안하여 더욱 몰입감 있고 만족스러운 문화유산 교육을 제공하는 방안에 대해 검토한다.
권오양(Oh-Yang Kwon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The current status and future trend of the accreditation are reviewed. The Accreditation Board for Engineering Education of Korea(ABEEK) is responsible to guarantee the substantial equivalence of engineering graduates internationally as well as domestically. For the former ABEEK has to become a member of Washington Accord, whereas it is essential for various professional societies including KSME to participate and support the ABEEK accreditation activity for the latter.
촉지적 상호작용 기반 훼손 유물 혼합현실 관람 시스템 개발
권오양(Oh-Yang Kwon),유정민(Jeong-Min Yu) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.1
Recently, research on the restoration of artifacts using 3D digital technology has been actively conducted, but studies using the data generated in the digital restoration process for exhibitions have been insufficient. Meanwhile, the development of 3D printing technology has provided an opportunity to expand the tactile interaction between the viewer and the artifact by enabling fast and inexpensive reproduction of artifacts. In this study, we developed a system that enables tactile interactions using 3D printed artifacts and mixed reality devices, while comparing the appearances of artifacts before and after restoration. As a result of comparing this system with the previously studied virtual artifact viewing methods, the proposed system showed good results in terms of presence and immersion. In addition, it was found that the application of tactile interaction rather than the simple mixed reality focusing on the visual experience brings positive results to the viewers who have already experienced immersive technology such as VR·AR·MR.
Status and Prospects of Nondestructive Testing and Evaluation in the Republic of Korea
이해,권오양,Lee, Hae,Kwon, Oh-Yang The Korean Society for Nondestructive Testing 1993 한국비파괴검사학회지 Vol.12 No.4
Past, present and future of nondestructive testing and evaluation(NDT&E) activities in Korea are reviewed. The current status and future direction in NDT&E research and development are presented. The newly revised edition of Korean NDT personnel qualification system is described. Other activities such as NDT&E training programs, NDT field services, and professional societies and international cooperation are also summarized. Founded in 1980, the Korean Society for Nondestructive Testing is now the center of domestic activities in NDT&E as well as the gateway to the international cooperation.
Sensor Fusion and Neural Network Analysis for Drill Wear Monitoring
Kritsada Prasopchaichana,Oh Yang Kwon(권오양) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.1
The objective of the study is to construct a sensor fusion system for tool-condition monitoring (TCM) that will lead to a more efficient and economical drill usage. Drill-wear monitoring has an important attribute in the automatic machining processes as it can help preventing the damage of tools and workpieces, and optimizing the drill usage. In this study, we present the architectures of a multi-layer feed-forward neural network with Levenberg-Marquardt training algorithm based on sensor fusion for the monitoring of drill-wear condition. The input features to the neural networks were extracted from AE, vibration and current signals using the wavelet packet transform (WPT) analysis. Training and testing were performed at a moderate range of cutting conditions in the dry drilling of steel plates. The results show good performance in drill- wear monitoring by the proposed method of sensor fusion and neural network analysis.
나노입자 코팅 CFRP의 모의 낙뢰 충격손상 후 압축시험에서의 음향방출 거동
신재하(Jae-Ha Shin),권오양(Oh-Yang Kwon),서성욱(Seong-Wook Seo) 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.1
모의 낙뢰시험에 의해 충격손상을 입은 탄소섬유강화플라스틱(CFRP) 복합재료의 잔류압축강도를 평가하는 시험(CAI) 중 손상부의 거동을 음향방출(AE)법으로 관찰하였다. CFRP 시편은 ITO 나노업자를 탄소섬유에 직접 코팅한 CFRP prepreg를 이용하여 만들었고, 모의 낙뢰시험은 고전압 대전류 인가장치(ICG)를 이용하여 시편에 10~40 ㎄의 충격파 전류를 인가하여 실시하였다. ITO 나노입자 코팅의 효과와 인가전류의 세기에 따른 손상영역의 크기와 잔류압축강도를 AE 거동과 연관하여 평가하였다. 손상영역의 크기는 초음파 C-scan 영상을 이용하여 측정하였으며, AE events 수와 AE event가 발생하기 시작할 때의 압축응력 수준을 연관시킨 결과 ITO 나노입자 코팅 CFRP의 경우 상대적으로 손상이 작고 훨씬 높은 용력수준에서 AE가 발생하기 시작하였다. CAI시험 중 AE측정은 실제로 낙뢰손상을 입은 복합재 동체 구조물의 손상된 정도를 구별하는 데 유용한 지표로 활용될 수 있음을 확인하였다. Nanoparticles-coated and impact-damaged carbon-fiber reinforced plastics(CFRP) laminates were tested under compression-after-impact(CAI) mode and the propagation of damage due to compressive loading has been monitored by acoustic emission(AE). The impact damage was induced not by mechanical loading but by a simulated lightning strike. CFRP laminates were made of carbon prepregs prepared by coating of conductive nano-particles directly on the fibers and the coupons were subjected to simulated lightning strikes with a high voltage/current impulse of 10~40 ㎄ within a few microseconds. The effects of nano-particles coating and the degree of damage induced by the simulated lightning strikes on the AE activities were examined, and the relationship between the compressive residual strength and AE behavior has been evaluated in terms of AE event counts and the onset of AE activity with the compressive loading. The degree of impact damage was also measured in terms of damage area by using ultrasonic C-scan images. From the results assessed during the CAI tests of damaged CFRP showed that AE monitoring appeared to be very useful to differentiate the degree of damage hence the mechanical integrity of composite structures damaged by lightning strikes.