• Journal of Korea Multimedia Society
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• v.11 no.9
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• pp.1204-1212
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• 2008

The vehicle simulation (flight simulator) in 1920's was the first in the virtual reality. With the development of precise optical and electromagnetic equipment, the virtual reality widened its application for other purposes than military one. Based on the realistic display technology, it is more and more common in the various areas such as entertainment, medical profession, learning, film, architectural design, tourism and etc. In 1989, Jaron Ranier was the first to use the terminology 'Virtual Reality'. With this term, all virtual projects could be classified in a single item. But even before the term was used, the virtual reality has been studied up to now. As a part of virtual reality, the human thirst for the impossible thing has led to the development of ride film. The ride film consists of the special technical elements as well as the psychological analysis of human being. The ultimate purpose of virtual reality is engrossment through interaction. Even though the real interaction requires interface, input sensor and reaction ability, the ride film is not an element of the typical interaction. The virtual reality is mostly defined in technical terms now. But in this study, we will analyze the concepts worked out by Professor Michael Haim who is called a philosopher in the cyberspace in aspect of experience-oriented definition. We will analyze the adaptability of virtual reality based on his concepts such as artificial reality/ interaction/ engrossment/ networked world/ remote display/ simulation/ onmon engrossment. And also, we aim to suggest the directions of developing the ride films for perfect engrossment and to draw optimized conclusion thereon. In this viewpoint, we consider that the study of ride film on which there were few case studies will contribute to level up the basic frameworks of IT technology and the digital image.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.6
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• pp.347-355
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• 2016

This study presents a Lattice Boltzmann Method (LBM) coupled with a momentum-exchange approach/fictitious domain (MEA/FD) method for the simulation of particle suspensions. The method combines the advantages of the LB and the FD methods by using two unrelated meshes, namely, a Eulerian mesh for the flow domain and a Lagrangian mesh for the solid domain. The rigid body conditions are enforced by the momentum-exchange scheme in which the desired value of velocity is imposed directly in the particle inner domain by introducing a pseudo body force to satisfy the constraint of rigid body motion, which is the key idea of a fictitious domain (FD) method. The LB-MEA/FD method has been validated by simulating two different cases, and the results have been compared with those through other methods. The numerical evidence illustrated the capability and robustness of the present method for simulating particle suspensions.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.3
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• pp.275-287
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• 2000

A virtual reality system must provide participants with a natural interaction, a sufficient immersion, and mostly, realistic images. To achieve this, it is crucial to provide a fast and uniform rendering speed regardless of the complexity of virtual worlds, or the complexity of simulation. In this paper, a virtual reality system which offers an improved rendering performance for complex virtual reality applications has been designed and implemented. The key idea of the proposed system is to exploit the multi-thread scheme in system module design, and execute each modules in parallel. Taking such design approach, rendering, simulation, and interaction can be executed independently. Hence, in applications where a simulation is complex or a scene is very large, this system can provide a more uniform and faster frame rates. The proposed method has been experimented under the various application environments in which scenes and simulations are very complex.

• Journal of Digital Convergence
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• v.18 no.2
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• pp.475-482
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• 2020

The purpose of this study is to analyze the paths of the presence that influences the use of the virtual simulation in the special education classrooms. The participants consisted of 76 students who majored in special education in J and K universities. Participants took a three lectures of 3-h. that addressed the theory and practice of virtual technology such as virtual reality(VR) and augmented reality(AR), and then completed the questionnaires on participants' presence level and expectation level of virtual simulation for special education. Study results were as followings: (1) Enjoyment and Communication have direct effects on positive expectation, while Immersion has a direct effect on negative concern; (2) Reality, Accessibility Performance, Communication, and Immersion have indirect effects mediated by Enjoyment on positive expectation; and (3) Communication and Reality have indirect effects mediated by Immersion on negative concern. Lastly, the implications and suggestions for future research were presented.

• The KIPS Transactions:PartA
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• v.9A no.4
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• pp.631-638
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• 2002

We have many difficult problems to efficient development and management of a Web-based education system because of the various requirements of various demanders. A Web-based education system consists of instructors and operation managers of system and learners. Those three factors are the most important e]ements of a Web-based education system and we must consider those elements for design and development. In constructivist approach. acquiring knowledge is made by experiences among each members or elements. So we can say that the constructivist elements of a Web-based education system is learners and instructors, operation managers. In this study, we design and implement a Web-based education system, based on the interactions of extended demanders of Web-based education system in constructivist approach and object oriented modeling. In this study we can improve portability and reduce cost because of platform independence from presented system. And in experiment, we compare and analyse two platform web-based education system a point of effectiveness, cost, convenience.

• The Transactions of the Korea Information Processing Society
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• v.3 no.1
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• pp.95-106
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• 1996

The most fundamental difference between general three dimensional computer graphics technology and virtual reality technology lies in the degree of realism as we feel, and thus the virtual reality method heavily relies on such tolls as data gloves, 3D auditory system to enhance human perception and recognition. Although these tolls are valid for such purpose, more essential ingredient. This paper provides further realism by modeling active interactions between the objects inside scenes. For this purpose, this paper proposes and implements a field model where the virtual reality space is treated as a physical field defined on the characteristic radius of stimulus and sense corresponding to the individual object. In the field model, the rule of cause and effect as an essential feature of the realism can be interpreted simply as an energy exchange between objects and consequently, variation on the radius information together with behavioral logic alone can build the virtual environment where each object can react to other objects actively and controllably.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.89-95
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• 2007

본 논문에서는 연속적 충돌검사 방법과 제약 조건 기반의 강체 역학 모델링 기법을 이용하여 마커 기반의 트래킹 환경에서 현실의 객체와 가상의 객체가 물리적으로 현실적이고 안정적으로 상호작용하는 증강현실 방법을 제안한다. 본 논문에서 구현된 증강 현실 시스템은 증강 현실환경상의 현실 객체를 인식하고 트래킹 하는 부분과 증강현실에 등장하는 모든 종류의 객체들 간의 물리적인 상호작용을 시뮬레이션 하는 부분으로 크게 구성된다. 객체 트래킹에 사용되는 일반적인 카메라로는 적은 수의 불연속적인 프레임 밖에 얻을 수 없는 성능의 근본적인 한계에도 불구하고, 본 논문에서는 연속적 충돌검사 방법을 이용하여 객체간의 올바른 충돌 정보를 얻을 수 있었고, 이를 이용하여 제약 조건 기반의 강체 역학 시뮬레이션을 적용하여 안정적이고 현실적인 물리 반응을 생성할 수 있었다. 제안한 방법론은 이러한 트래킹 지연에도 불구하고 본 논문에서 사용된 다양한 벤치마킹 시나리오에서, 안정적으로 현실의 객체와 가상의 객체 사이에 물리적으로 실감나는 인터랙션 결과를 보여주었다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.223-225
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• 2001

최근 인터넷과 비몰입형 가상현실 기술을 기반으로 하는 3D 사이버스페이스 분야에 대한 관심이 고조되고 있다. 그 동안 3D 그래픽의 처리나 네트워크 상의 데이터 전송기술과 같은 하드웨어 분야에서는 많은 개선이 있었으나 가상환경 내부의 다양한 상호작용을 처리하는 부분에 있어서는 연구가 미진한 실정이다. 특히 3D 사이버스페이스 상에서 참여자의 의사결정 및 상호작용의 수단이 되는 3D 사용자 인터페이스에 대한 연구는 성공적인 연구사례가 보고되지 않았다. 현재 실험적인 수준의 3D 사이버스페이스가 앞으로 좀더 활성화되고 일반화되기 위해서는 사용자 관점을 지원하는 친숙하고 자연스러운 3D 사용자 인터페이스에 대한 연구가 필요하다. 본 논문에서는 현재 가장 일반적인 입력 장치로서 사용되는 2D 마우스를 이용하여 3D 사이버스페이스 상의 다양한 객체들을 자연스럽게 조작할 수 있게 하는 3D 조작 인터페이스를 제안한다. 제안된 3D 조작 인터페이스를 실시간 환경에 적용하여 검증한 결과 3D 사이버스페이스 상에서의 상호작용을 매우 효과적으로 지원할 수 있음을 확인하였다.

• Annual Conference of KIPS
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• 2013.05a
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• pp.968-971
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• 2013

이 논문에서는 FSM(Finite State Machine) 기반 온라인 게임 서버 테스트 자동화 시스템을 제안한다. 게임 서버의 테스트 자동화는 테스트로 인한 비용, 시간적 제약, 테스트 자원의 재사용 측면에서 이득이 있다. 기존의 테스트 자동화 방식은 사용자간의 상호작용을 고려하지 않기 때문에 게임 서버의 성능에 대한 정확한 측정이 어렵다. 또한, 실제 서비스 시에 수용할 수 있는 동시 접속 인원수를 예측하기 어렵다. 이 논문에서 가상 유저를 이용한 테스트를 할 경우 FSM 을 이용하여 가상유저간의 상호작용이 가능하게 한다. 이를 이용하여 게임 서버의 성능 측정의 정확도 개선이 가능하다. 제안 시스템을 검증하기 위해 상호작용을 고려하지 않은 테스트 방법과 비교 평가 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.337-339
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• 2002

본 논문에서는 새로운 컴퓨팅 환경인 그리드를 이용한 가상 환경을 관리하는 Module들을 제공하는 모델을 제시하고 구현 방법을 설명한다. 이 모델은 자원 공유를 통한 새로운 컴퓨팅 환경을 제공하려는 그리드와 많은 참여자가 가상 환경에서 상호작용으로 인한 고용량 컴퓨팅 리소스를 요구하는 가상 환경 응용 프로그램들을 위한 CAVERNSoft를 상호 보안적인 측면을 고려하여 현재 제공되지 않는 Resource 관리자, Data Distribution 관리자, State 관리자, Clinet 관리자를 제시하고 구현했다는 점에서 그 장점이 있다.