• 산업공학
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• 제16권2호
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• pp.258-267
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• 2003

Recently, virtual reality technologies have been rapidly developed and realtime virtual simulation methods have been extensively employed for several application areas such as game, sports, manufacturing, military, and so on. A 3D database in realtime virtual simulation plays a key role because it makes users feel reality in virtual space. In a application view of 3D database, a systematic construction approach is required to reduce its construction time and increase its quality. However, many researches have been mostly focused on realtime graphic issues and its key technologies. In virtual simulation of transportation equipments, this paper proposes a systematic construction process of 3D database consisting of four stages as follows: 1) determine the activity space of a equipment, 2) collect data related to 3D database construction, 3) make a 3-dimensional modeling strategy, and 4) generate and evaluate a 3D model. This paper also introduces a new procedure of 3D environment modeling, which summarizes and expands our modeling experiences, to be used as a modeling guide.

• 한국산학기술학회논문지
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• 제7권1호
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• pp.57-62
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• 2006

본 논문에서는 3D 의복 착의 시뮬레이션에서 사용되는 3D 의복 모델을 제작하는 시스템을 제안한다. 착의 시뮬레이션을 하기 위해서는 3D 인체모델과 3D 의복 모델이 필요하다. 의복 모델을 디자인하기 위해서는 먼저 작업 Matrix 창을 생성하고 디자이너로부터 2D 피스(Piece)를 디자인한다. 디자인된 피스들을 박음질 선을 이용해 연결하고 마지막으로 디자인된 피스와 박음질 데이터를 사용해 수치 데이터를 생성하여 3D 의복 모델을 만든다. 본 논문에서 제안한 시스템에서는 피스 디자인 모듈, 의복 데이터 읽기/저장 모듈, 착의 시뮬레이션 모듈로 이루어져 있다.

• 한국멀티미디어학회논문지
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• 제10권7호
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• pp.934-943
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• 2007

컴퓨터 그래픽스 분야에서 다뤄지는 유체 시뮬레이션은 사실적인 애니메이션에 있어서 필수적인 요소이기는 하지만 그 계산량이 너무 많아서 실시간 시뮬레이션과 렌더링을 위해서는 많은 시스템 자원을 필요로 하여 주로 PC 환경에서 수행되어 왔다. 최근 휴대 전화의 성능이 빠르게 발전함에 따라 3D 게임과 같은 고급 콘텐츠를 모바일 환경에서 사용 가능하게 되었다. 본 논문에서는 PC 환경보다 비교적 성능이 제한적인 모바일 장치에서 위피 플랫폼의 MF3D API를 사용하여 실시간 유체 시뮬레이션을 구현하였다. 유체 시뮬레이션을 구현하기 위하여 나비에-스토크스 식의 풀이가 필요하며, 빠르고 안정적으로 수치해를 시뮬레이션하기 위해서 Stam의 Stable Fluid 기법을 빌보드에서 구현하여 사용하였다. 시뮬레이션 결과는 빌보드 기법을 통해 화면에 나타냈으며, "루피 스토리"라는 모바일 3D 게임 콘텐츠에 적용하였다.

• 한국멀티미디어학회논문지
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• 제24권5호
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• pp.629-641
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• 2021

Crowd behavior simulations have been studied to further accelerated and refined by parallelism by inducing agent-interacting forces into the image field representing the forces of attraction and repulsion. However, it was difficult to consider rapidly changing environments such as fire situations in buildings because texture images must be generated in advance simulation starts and simulations can only be performed in 2D spaces. In this paper, we propose a crowd agent behavior simulation method based on agent's 3D affordance field for flexible agent behavior in variable geomorphological environments in 3D space. The proposed method generates 3D affordance field related to agents and sensors in 3D space and defines the agent behavior in 3D space for the crowd behavior simulation based on an image-inducing field to a 3D space. Experimental results verified that our method enables the development of large-scale crowd behavior simulations that are flexible to various fire evacuation situations in 3D virtual spaces.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.579-586
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• 2009

4D simulation integrates the 3 dimensional model of a building with the construction schedule, and it leads to the possibility of virtually checking the construction process and the building itself in advance. However, the existing problem of 4D simulation is the difference between the demands of architects, engineers, and construction site workers in 4D simulation. This study suggests the possible way to enhance the availability of 4D simulation, considering more the practical demands from the construction site. In order to conduct this study, we build a 3D BIM model of a business-residential complex and link the model with the pre-defined construction schedule in order to make a 4D simulation. This study concludes with the optimized 4D simulation methodology based on BIM model considering the demands in perspective of the construction site. It would contribute to the harmonic collaboration among architects, engineers, and labors in the construction site when using 4D simulation based on BIM model.

• 한국CDE학회논문집
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• 제5권4호
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• pp.327-335
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• 2000

The spent fuel rod extracting machine is automatically operated in high radioactive environment, so high reliability of operation is required. In this paper, to enhance the reliability of this machine by providing a close monitoring capability. a real time graphic simulation method is suggested. This method utilizes conventional IGRIP (Interactive Graphics Robot Instruction Program) 3D graphic simulation tool to visualize and simulate the 3D graphic model of this machine. Also, the dedicated protocol is defined for transmission of the operational data of the machine. The real time graphic simulation is realized by developing the socket module between a graphic workstation and a machine control computer through the TCP/IP network and by dividing the 3D graphic simulation GSL(Graphic Simulation Language) program as a small sized sub routine. The suggested method is implemented while automatically operating the rod extracting machine. The result of implementation shows that the real time 3D graphic simulation is well synchronized with the actual machine according to the operational data.

• 한국정보시스템학회지:정보시스템연구
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• 제27권4호
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• pp.35-70
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• 2018

Purpose Recently, 3D factory simulation technology has emeged as a powerful tool for modeling and analysis of a wide range of production systems, however, it has been not paid much attention in Korea. In this context, this paper aims to provide a comprehensive literature review on discrete event simulation softwares and introduce a promising 3D factory simulation software called FlexSim and its application domains. Design/methodology/approach In order to demonstrate worldwide popularity and technical superiority of FlexSim software, we analyzed the recent list of rankings for commercial discrete simulation softwares released by winter simulation conference and users' opinions collected from business software review site. Moreover, several main application domains are derived from a review of the previous research papers that deal with applications of FlexSim software. Findings FlexSim software recently moved up the list of major commercial simulation softwares, and technical superiorities of the software demonstrate that it is a promising tool for practical 3D factory simulation. Moreover, recent research papers suggest that FlexSim software can be used as a component of smart factory system. In this context, it is expected that FlexSim software becomes more popular in the era of industry 4.0.

• 한국시뮬레이션학회논문지
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• 제15권3호
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• pp.93-101
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• 2006

근래에 작업자의 근골격계 질환이 산업현장의 주요한 논제로 등장하였다. 이러한 문제를 줄이기 위하여 다양한 방법들이 사용되고 있는데 그 중의 하나가 제품설계, 치구설계, 작업장 설계를 할 때 작업자의 안전을 최대한 확보하도록 설계단계에서 개선을 하는 것이다. 최근에 급속히 발전하고 있는 3D 시뮬레이션 기술을 사용하면 작업장을 설계하는 단계에서 제품 및 치구의 3D 도면을 이용하여 가상의 작업공간을 구축한 후 작업자의 작업 자세를 사전에 검증해 볼 수 있기 때문에 작업장 구축 후 발생할 수 있는 많은 문제점들을 사전에 검증하여 설계실패비용을 최소화할 수 있다. 본 논문은 3D 작업자 시뮬레이션을 이용하여 굴삭기 공장의 특정한 공정을 대상으로 개선 및 최적화를 하기위한 연구다. 먼저 CATIA를 이용하여 제품과 치구 등 작업장 구축을 위한 3D 모델을 개발하였다. 그리고 IGRIP, DPM. Human 등의 개발도구를 복합적으로 이용하여 작업장에서의 작업내용을 시뮬레이션 할 수 있는 모델을 개발한 후 작업 자세에 대한 분석을 수행하였다. 분석결과는 작업장을 개선하는데 이용하였다.

• 한국컴퓨터정보학회논문지
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• 제13권7호
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• pp.221-229
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• 2008

컴퓨터와 더불어 멀티미디어의 발전은 가상현실이라는 신기술을 만들어 내게 하였고 가상현실 분야 중 컴퓨터 시뮬레이션 기술은 항공, 자동차, 의학, 스포츠, 교육, 패션 분야에 이르기까지 그 적용이 확대되고 있다 본 연구는 헤어스타일링 분야에서 기존의 2차원 헤어시뮬레이션의 개발 및 상용 현황과, 연구 단계에 있는 3차원 헤어스타일 시뮬레이션의 개발 현황을 살펴본다. 아울러 현재 개발된 3차원 헤어스타일 시뮬레이션이 상용화하기 위해서는 3D 시스템 부스의 조정, 저가 저화질의 카메라 개선 등의 문제점이 있음을 제시하였다. 이를 개선하기 위해서 object photography 방식에서 panoramic photography 방식의 전환, 중 고가의 고화질 카메라로의 대체들을 제안한다.

• 대한원격탐사학회지
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• 제24권5호
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• pp.497-506
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• 2008

The needs for digital models of real environment such as 3D terrain or cyber city model are increasing. Most of applications related with modeling and simulation require virtual environment constructed from geospatial information of real world in order to guarantee reliability and accuracy of the simulation. The most fundamental data for building virtual environment, terrain elevation and orthogonal imagery is acquired from optical sensor of satellite or airplane. Providing interoperable and reusable digital model is important to promote practical application of high-resolution satellite imagery. This paper presents the new research regarding representation of geospatial information, especially for 3D shape and appearance of virtual terrain. and describe framework for constructing real-time 3D model of large terrain based on high-resolution satellite imagery. It provides infrastructure of 3D simulation with geographical context. Web architecture, XML language and open protocols to build a standard based 3D terrain are presented. Details of standard-based approach for providing infrastructure of real-time 3D simulation using high-resolution satellite imagery are also presented. This work would facilitate interchange and interoperability across diverse systems and be usable by governments, industry scientists and general public.