• 한국콘텐츠학회논문지
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• 제21권8호
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• pp.258-270
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• 2021

이 연구는 치의학 교육을 위한 부정교합 진찰용 가상현실 시뮬레이션의 적용 효과를 검증하기 위한 것이다. 부정교합 진단을 위해서는 치아모형을 사실적인 수준으로 만들어야 하며 이렇게 개발된 치아모형을 손으로 쥐고 상세하게 관찰할 수 있어야 한다. 이 연구에서는 치의학 가상현실 시뮬레이션을 만들기 위한 4단계 모델링 절차를 적용했다. 또한 이렇게 개발된 가상현실 시뮬레이션이 학습자의 숙달수준에 따라서 어떻게 지각되는가를 확인하기 위해서 HMD를 착용하고 진단을 하도록 했다. 이 연구에는 치의학전문대학원 재학생 3학년(29명), 4학년(29명), 치의학 전공의(28명)이 참여했으며, 두 가지 증례에 대한 진단활동을 통해서 과제부하와 사용용이성을 측정했다. 과제부하에 대한 검증에서 3학년이 전공의보다 더 많은 정신적 요구량과 당혹감을 지각하고 있었다. 이 결과는 시뮬레이션을 사용할 때 숙달수준에 따라서 지각하는 과제부하가 달라지고 있음을 보여주는 것이다. 반면에 사용용이성(구강모형의 조작, 오류수정, 오류인식)에서 4학년이 전공의보다 더 높은 용이성 지각을 보여줬다. 이 연구를 통하여 전문 훈련용 가상현실 시뮬레이션의 개발을 위한 함의점을 논의하였다.

• 전기전자학회논문지
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• 제26권2호
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• pp.150-159
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• 2022

본 논문에서는 증강현실(AR) 당구 콘텐츠를 위한 물리 시뮬레이션을 제안한다. 제안하는 증강현실 당구 콘텐츠에 대한 물리 시뮬레이션의 특징은 다음과 같다. 먼저, 증강현실 환경에서 실제와 비슷한 당구공의 움직임을 구현하기 위해 당구공에 적용되는 힘과 관성모멘트 계산을 하여 물리식을 도출한다. 다음에 타격 지점에 대한 가상 당구공의 회전과 관련된 가상 당구공의 속도와 각속도를 구한다. 다음으로, 가상 당구공의 움직임 궤적이 실제 당구공과 비슷한 움직임을 구현하기 위하여 입사벡터, 법선벡터, 반사벡터 등의 물리식을 도출하게 된다. 이러한 방정식을 증강현실 환경에 적용하여 AR 당구 콘텐츠를 구현할 수 있다. 이러한 물리 시뮬레이션은 사용자가 가상 당구대를 사용하여 실제와 유사함을 느낄 수 있도록 하며 실제 환경과 상호 작용하게 돕는다. 실험 결과 실제 당구공의 경로와 가상 당구공의 경로 사이의 정확도 범위는 97.75%~99.11%로 계산됐다. 따라서 본 논문에서 제안하는 증강현실 당구 콘텐츠에 대한 물리 시뮬레이션의 성능은 실제 당구공의 경로와 유사함을 확인하였다.

• 한국응급구조학회지
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• 제26권3호
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• pp.137-148
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• 2022

Purpose: This study aims to provide essential data for developing educational methods and content, tailored for the prehospital field situation, by analyzing the effects of education regarding the management of cardiac arrest. Methods: This study is a primitive experimental study of 55 new firefighters in C Fire Service Academy. Data were collected from the training which was imparted using the CPR virtual reality simulation program (CBS 2.0) in accordance with COVID-19 quarantine rules and social distancing. Data were analyzed utilizing SPSS version 25.0. Results: After VR simulation training, knowledge about performing CPR (14.85) and self-efficacy (4.12) were significantly high (p<.001). Learning immersion was also high (3.99±0.59), but learning satisfaction was even higher (4.34±0.62). Depending on the recruitment field, firefighters showed higher learning immersion (4.04±0.58 vs 3.68±0.63) and self-efficacy (4.16±0.55 vs 3.91±0.84) than 119 EMTs' but, there was no significant difference between them. In contrast, The quality of performance of CPR by EMT's was significantly higher than that of firefighters (p=.025). Depending on previous simulation experience, there was no significant difference among dependent variables. Conclusion: Virtual reality simulation shows positive results in learning immersion, learning satisfaction, self-efficacy, and performance of CPR. Therefore, we propose that virtual reality simulation training can be a new educational paradigm.

• Journal of Mechanical Science and Technology
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• 제20권1호
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• pp.29-41
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• 2006

Nowadays, with the advancement of computers, computer simulation linked with VR (Virtual Reality) technology has become a useful method for designing the automotive driving system. In this paper, the VR simulation system was developed to investigate the driving performances of the ASV (Advanced Safety Vehicle) equipped with an ACC (Adaptive Cruise Control) system. For this purpose, VR environment which generates visual and sound information of the vehicle, road, facilities, and terrain was organized for the realistic driving situation. Mathematical models of vehicle dynamic analysis, which includes the ACC algorithm, have been constructed for computer simulation. The ACC algorithm modulates the throttle and the brake functions of vehicles to regulate their speeds so that the vehicles can keep proper spacing. Also, the real-time simulation algorithm synchronizes vehicle dynamics simulation with VR rendering. With the developed VR simulation system, several scenarios are applied to evaluate the adaptive cruise controlled vehicle for various driving situations.

• 한국CDE학회논문집
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• 제13권6호
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• pp.429-439
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• 2008

With a remote operated manipulator system, the situation at a remote site can be rendered through remote visualized image to the operator. Then the operator can quickly realize situations and control the slave manipulator by operating a master input device based on the information of the virtual image. In this study, the remote operator visual support system (ROVSS) was developed for viewing support of a remote operator to perform the remote task effectively. A visual support model based on virtual environment was also inserted and used to fulfill the need of this study. The framework for the system was created by Windows API based on PC and the library of 3D graphic simulation tool such as ENVISION. To realize this system, an operation test environment for a limited operating site was constructed by using experimental robot operation. A 3D virtual environment was designed to provide accurate information about the rotation of robot manipulator, the location and distance of operation tool through the real time synchronization. In order to show the efficiency of the visual support, we conducted the experiments by four methods such as the direct view, the camera view, the virtual view and camera view plus virtual view. The experimental results show that the method of camera view plus virtual view has about 30% more efficiency than the method of camera view.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.911-914
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• 2005

Soft tissue characterization and modeling based on living tissues has been investigated in order to provide a more realistic behavior in a virtual reality based surgical simulation. In this paper, we characterize the nonlinear viscoelastic properties of intra-abdominal organs using the data from in vivo animal experiments and inverse FE parameter estimation algorithm. In the assumptions of quasi-linear-viscoelastic theory, we estimated the nonlinear material parameters to provide a physically based simulation of tissue deformations. To calibrate the parameters to the experimental results, we developed a three dimensional FE model to simulate the forces at the indenter and an optimization program that updates new parameters and runs the simulation iteratively. The comparison between simulation and experimental behavior of pig intra abdominal soft tissue are presented to provide a validness of the tissue model using our approach.

• 한국CDE학회논문집
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• 제13권1호
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• pp.18-26
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• 2008

Shipbuilding industries have been struggling to reduce production time and cost of their products in many aspects. Manufacturing systems have been changed, new production lines and robots have been installed, and new planning and scheduling systems have been adopted in order to achieve shorter time-to-market and higher productivity. Simulation based manufacturing, digital manufacturing, or virtual manufacturing simulation, whatever the name means, is an approach to achieve such a goal. In order to improve productivity in a shipbuilding process at a shipyard, a digital shipyard development has been driven. This paper proposed how to implement the digital shipyard, what to do with it, and what to obtain from it. This digital shipyard will help simulate and optimize the entire shipbuilding life cycle with its virtual environment through shipbuilding process from the initial development stage to the launch.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.563-566
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• 2006

In this paper, we studied about AGVs modeling and material handling automation simulation using a virtual AGV. The proposed virtual AGV model that operates independently each other is based on a real AGV. Continuous straight-line and workstation model using vector drawing method that could easily, rapidly work system modeling are suggested. Centralized traffic control, which could collision avoidance in intersection and should not stop AGV as possible, and algorithm for detour routing which performs when another AGV is working in pre-routed path are proposed. The traffic control and the algorithm have been proved efficiently by simulation.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1998년도 추계학술대회 및 정기총회
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• pp.204-208
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• 1998

The fundamental issues to evaluate machine tool's performance through simulation pertain to the physical models of the machine tool itself and of process while the practical problems are related to the development of the modular software structure. It allows the composition of arbitrary machine/process models along with the development of programs to evaluate each state of machining process. Surface roughness is one of the fundamental factors to evaluate machining process and performance of machine tool, but it is not easy to evaluate surface roughness due to its tribological complexity. This paper presents an algorithm to calculate surface roughness considering cutting geometry, cutting parameters, and contact dynamics of cutting between tool and workpiece as well as tool wear in turning process. The designed virtual machining system can be used to evaluate the surface integrity of a turned surface during the design and process planning phase for the design for manufacturability analysis of the concurrent engineering.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 Proceeding of CIN-KIN Joint Symposium 2000 on M.E.T. Under STCW 78/95 and SINO-KOREA MARITIME CONTACT IN MID-CENTURIES
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• pp.93-105
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• 2000

This paper describes prototype Virtual Reality Ship Simulator (VRSS) that we have recently developed next-generation training equipment based on the virtual reality (VR) technology. The inherent defects of conventional ship simulators are enormous costs and difficult system upgrade due to the system construction, such as large mock-up bridge system, wide visual presentations, In this paper, to cope with those problems, we explored VR technology that can give realistic environments in a virtual world. Then we constructed prototype VRSS system, which is, consists of PC-based human sensors, and Databases set having 3D object models and coefficients of Head Related Transfer Functions (HRTFs). 3D-WEBMASTER authoring tool was used as Virtual Reality Modeling Language (VRML). Using the VRSS system, we constructed Port an Passage Simulator for the harbor of INCHON in Korea, and Ship and Sea State Simulator for an arbitrary given sea environmental states by user. Through many simulation tests, we testified the efficiency of developed prototype VRSS by subject assessment with five participants. Then, we present results on the simulation experiments and conclude with discussion of evaluation results.