• 정보학연구
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• 제9권1호
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• pp.21-32
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• 2006

Acrophobia is a symptom of feeling an abnormal fear of heights. Medications or cognitive-behavior methods have been mainly used to treat the acrophobia. In these days the virtua1 reality technology has been applied to treat such an anxiety disorders. In this thesis, an telemedicine assistant system for treatment of acrophobia using biomedical signals and virtual reality technique is proposed. I made two virtual reality simulations for treatment of acrophobia and telemedicine system for communication between doctor and patient using personal computer. A virtual environment provides patient with stimuli which arouses phobia, and exposition to such environment makes him have ability to overcome the fear. Recently, the patient can take diagnosis from a medical doctor in distance with the telemedicine system. Multimedia conference service, on-line questionary, signal transfer system are needed to configure such system. Virtual reality simulation system that composed of position sensor, head mount display, and audio system, is also included in this telemedicine system. I added virtual environment update system to this virtual reality telemedicine system for treatment of acrophobia. Former acrophobia treatment systems use only patient's score of the questionary to appraise. The new system developed in this thesis uses not only patient's score of the questionary but also biomedical signals such as HR, GSR amplitude, GSR RT to increase the objectivity and quantitativity. The experimental results show that HR and GSR amplitude are useful for decision of acrophobia. We will apply this system to the acrophobia patient in distance and be able to offer better medical treatment for mental illness in near future.

• 한국멀티미디어학회논문지
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• 제15권1호
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• pp.148-165
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• 2012

가상목업을 이용한 정비 시뮬레이션을 제품 설계 단계에 적용함으로써 시제품 제작 전 정비성을 검증할 수 있고, 제품 개발 비용을 절감할 것으로 기대되고 있다. 정비 시뮬레이션 결과는 정비 매뉴얼 컨텐츠로 재사용하거나 RAM (Reliability, Availability, Maintainability) 분석 자료로 활용할 수 있다. 가상 환경에서 설계 타당성을 검증하기 위해 정비 시뮬레이션은 가상 제품의 물리특성, 부품의 조립관계, 조작 과정을 실제 환경과 유사하게 제공해야 한다. 시뮬레이션 시스템은 협업 정비 절차를 수행하기 위해 가상 협업 환경으로 확장되어야 한다. 본 논문은 현재 알려진 정비 시뮬레이션을 가상 협업 환경으로 확장하기 위한 3계층 시스템 구조와 물리모의 기반 협업 인터렉션 기술을 제안한다. 제안된 협업 정비 시뮬레이션 시스템은 가상목업 정비 시뮬레이션 시스템으로 구현하였으며, 시뮬레이션 결과를 VADE (Virtual Assembly Design Environment) 사례와 비교하여 물리모의 기반 협업 인터렉션 기술로 다양한 정비 작업을 모의하는 것이 가능함을 확인하였다.

• 한국산학기술학회논문지
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• 제6권6호
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• pp.547-554
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• 2005

Virtual Laboratory는 네트워크 기술의 발전에 따라 제어 및 계측 분야에서 등장하게 된 새로운 개념으로서 현재 여러 대학 및 연구기관에서 폭넓게 사용되고 있다. Virtual Laboratory를 통하여 사용자는 언제 어디서든지 인스트루먼트에 대한 제어 및 모니터링을 할 수 있는데 이러한 특징은 기존의 실험실에서는 얻을 수 없었던 사용자 효율성 및 향상된 성능을 제공한다. 본 논문에서는 먼저 이러한 Virtual Laboratory의 개념 및 필요성에 대해 간략히 살펴본 후 이를 구현하기 위한 방안에 대해 논의하고자 한다. 사용자가 네트워크상에서 원격의 인스트루먼트를 조작 및 운용할 수 있는 클라이언트-서버 기반의 Virtual Laboratory 구현을 위한 프레임워크 설계를 하고자 하며 단일 프로세서는 물론이고 네트워크상에서 대칭적 다중 프로세서 기반의 제어 및 계측 기능을 수행할 수 있는 시스템 모델을 제안하고자 한다.

• 컴퓨터교육학회논문지
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• 제10권5호
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• pp.53-60
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• 2007

학습효율의 향상을 위해 본 논문에서는 웹기반 가상실험시스템과 원격실험시스템을 적절하게 통합하여 전기전자회로에 대한 하이브리드 실험시스템을 구현하였다. 먼저, 전기/전자회로 실험에 대한 웹기반 가상실험실을 개발하여 개념학습, 가상실험, 평가등의 3개의 주요 세션과 그에 대한 관리시스템으로 구성하였다. 다음으로 가상실험을 진행하는 동안 발생할 수 있는 현실감의 부족성 문제를 해결하기 위해 전기전자회로에 대한 원격실험시스템을 구현하였다. 제안된 가상/원격실험시스템은 독립적인 형태로 사용될 수도 있지만, 학습효율을 극대화하기 위해서 두 개의 시스템을 통합하여 하이브리드 전기전자 실험시스템을 구현하였다.

• 대한치과교정학회지
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• 제41권2호
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• pp.138-146
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• 2011

The purpose of this article is to introduce a new virtual orthodontic treatment (VOT) system, which can be used to construct three-dimensional (3D) virtual models, establish a 3D virtual setup, enable the placement of the virtual brackets at the predetermined position, and fabricate the transfer jig with a customized bracket base for indirect bonding (IDB) using the stereolithographic technique. A 26-year-old woman presented with anterior openbite, crowding in the upper and lower arches, and narrow and tapered upper arch, despite having an acceptable profile and balanced facial proportion. The treatment plan was rapid palatal expansion (RPE) without extraction. After 10 days of RPE, sufficient space was obtained for decrowding. After a 10-week retention period, accurate pretreatment plaster models were obtained using silicone rubber impression. IDB was performed according to the protocol of the VOT system. Crowding of the upper and lower arches was effectively resolved, and anterior openbite was corrected to normal overbite. Superimposition of the 3D virtual setup models (3D-VSM) and post-treatment 3D virtual models showed that the latter deviated only slightly from the former. Thus, the use of the VOT system helped obtain an acceptable outcome in this case of mild crowding treated without extraction. More cases should be treated using this system, and the pre- and post-treatment virtual models should be compared to obtain feedback regarding the procedure; this will support doctors and dental laboratory technicians during the learning curve.

• 공학교육연구
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• 제5권1호
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• pp.19-26
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• 2002

본 논문에서는 학습자와 교수자간의 상호작용을 극대화하여 웹 상에서 효과적인 학습이 일어날 수 있도록 하는 기초전기회로 가상실험실을 자바 애플릿을 이용하여 구현하였다. 제안된 가상 실험실은 크게 실험원리학습실, 모의실험학습실, 자바가상실험학습실 및 가상실험실 관리 및 평가시스템으로 구성되어 있어 학습자로 하여금 흥미를 유발하여 전기회로실험을 간단한 마우스 조작만으로 수행하여 예비실험 결과를 데이터베이스에 저장하여 PHP를 이용하여 예비보고서 형태로 작성하여 학습자로 하여금 출력하여 프린트할 수 있도록 하였다. 본 논문에서 구현된 효율적인 기초전기회로 가상실험실은 수많은 방법중의 하나로써 향후 많은 수정과 보완이 이루어지리라 기대하며 기존의 교육시스템에서 발생되는 문제를 상당부분 보완할 수 있을 것으로 생각된다.

• 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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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• pp.216-218
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• 1999

This paper presents an advanced virtual lecture system for power system which is based on web. So far, conventional web-based virtual lecture systems which simply would use hyper-text couldn't use characteristics of multimedia in web. Comparing with printed publication, such conventional virtual lecture systems as only display on monitor couldn't be superior in validity and effectiveness. So, in this paper the proposed virtual lecture system uses web-based multimedia functions, including lecture-note and AOD(Audio on Demand), in order to overcome an individual difference of learning efficiency and suggests simple simulation programs for lecture contents which can be performed directly in on-line.

• 한국자동차공학회논문집
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• 제11권2호
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• pp.40-47
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• 2003

This paper presents a new evaporative system monitoring method using a virtual HC sensor for an automotive on-board diagnosis. A development was made at providing mathematical expressions from the lambda control information to estimate the HC mass flow purged into the intake manifold from the canister for implementing a virtual HC sensor. The change of the lambda averagevalue reflected the influence of the additional fuel from purging results the sensor estimation of the purged HC amount. Based on this virtual HC sensor, a new evaporative system monitoring method was proposed comparing the amount of purged HC amount with the amount of the HC gas evaporated from the fuel tank and absorbed into the canister. Finally, the method was validated with a simulation using the data logged from the retail car.

• 소성∙가공
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• 제12권6호
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• pp.550-557
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• 2003

In this study, a web-based system was developed by utilizing finite element method and virtual system designed using Virtual Reality Modeling Language (VRML). The simulation program for axi-symetric sheet forming is developed using finite flement method. The developed system consists of two modules, client module and server module. The client module was developed by using Active-X control. The input data for FEM calculation is transferred to the server module by using communication protocol. Then sever module performs several successive processes: input data generation, forming simulation, conversion of results to VRML format. After that, the results from the simulation can be visualized on the web browser in client computer. Besides, client module offers the capability to control and navigate on virtual forming machine and calculated result. By using this system simulation result can be investigated more realistically in virtual environment including forming machine.