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부띠에,류가애,정상권,이국환,류관희,Chheang, Vuthea,Ryu, Ga-Ae,Jeong, Sangkwon,Lee, Gookhwan,Yoo, Kwan-Hee The Institute of Electronics and Information Engin 2017 전자공학회논문지 Vol.27 No.9
웹 3D 기술은 과학, 의료, 공학 그리고 멀티미디어 가시화의 경험을 시뮬레이션하기 위해 사용될 수 있다. 웹 환경에서 3D 가상현실은 운영체제 등에 관계없이 사용될 수 있으며, 가상현실은 3차원 컴퓨터에 의해 생성된 현실적인 영상, 음향과 다른 감각을 표현하고 사람들과의 사용작용을 원활하게 하기 위해 사용될 수 있다. 특히 가상현실에 참여하는 사람들은 몰임하여 객체를 조작할 수도 있고, 원하는 목표를 위해 단계별 행동을 실행할 수 있다. 일반적으로 웹 환경에서 3D 상호작용 콘텐츠를 정의한 ISO 국제표준인 X3D를 이용하여 가상현실 공간을 생성한다. 본 논문에서는 X3D 가상현실 공간에서 스테레오 렌더링을 논의하고, HMD VR을 위한 새로운 X3D 노드를 제안한다. 제안한 노드들은 X3D 웹 브라우저인 X3DOM에 의해 가시화되었다. Web 3D technology can be used to simulate the experiments of scientific, medical, engineering and multimedia visualization. On the web environment, 3D virtual reality can be accessed well without strictly on operating system, location and time. Virtual Reality (VR) is used to depict a three-dimensional, computer generated realistic images, sound and other sensations to replicated a real environment or an imaginary setting which can be explored and interacted with by a person. That person is immersed within virtual environment and is able to manipulate objects or perform a series of action. Virtual environment can be created with X3D which is the ISO standard for defining 3D interactive, web-based 3D content and integrating with multimedia. In this paper, we discuss about X3D VR stereo rendering scene and propose new X3D nodes for the HMD VR (head mounted display virtual reality). The proposed nodes are visualized by the web browser X3DOM of X3D.
미세 채널에서 R123/R134a 혼합 냉매의 유동 비등 열전달에 대한 실험적 연구
인세환(Sehwan In),정상권(Sangkwon Jeong) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper describes flow boiling heat transfer of a R123/R134a mixture (mole fraction of R123, 0.746) in the micro-channel of 0.19 ㎜ ID. The experiment was performed at mass velocities from 314 to 470 ㎏/㎡-s, heat fluxes from 10 to 20 ㎾/㎡, vapor qualities from 0.2 to 0.85 and the saturation pressure of 360 ㎪. The flow boiling heat transfer characteristics of the mixture were similar to those of a single component, R123 which had indicated both mass velocity and heat flux effects in the previous experiment for the identical micro-channel. The heat transfer coefficients were compared with the correlation established from the flow boiling experiment of a single component, R123. The reduction of heat transfer coefficients by a mass diffusion effect was found from the comparison. The reduction rate, moreover, was compared with the mixture correction factor of macro-channels.
장기태(Kitae Jang),정상권(Sangkwon Jeong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In the present study, the compression process in scroll compressor was simulated in consideration of<br/> flow leakage and heat transfer. Tangential and radial leakages of the refrigerant between the scrolls<br/> were considered as nozzle flow. The experiment was first conducted with a scroll compressor for<br/> automobile air conditioning system and R134a as a refrigerant. Temperature and pressure were<br/> measured at the suction and discharge ports of the compressor to determine the thermodynamic states<br/> of the refrigerant flow. Temperature distribution of the scroll with the involute angle was also measured<br/> by thermocouples that were installed inside the scroll. Measured temperature distribution was compared<br/> with the numerical results. From this result, the thermal effect of mechanical contact was found to be<br/> important in heat transfer of the compression process.
엔트로피 생성을 고려한 능동형 자기 재생기의 성능특성에 관한 연구
김영권(Youngkwon Kim),정상권(Sangkwon Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Internal state of an active magnetic regenerator (AMR) is very comples to investigate since heat pumping mechanism in the active magentic regenerator occurs by transient heat transfer between magnetic refrigerant and oscillating heat transfer medium. In this paper, the performance of active magnetic regenerator is discussed in conjunction with entropy generation. Entropy generation is calculated by one dimensional numerical simulation of a room temperature refrigeration system that utilizes Gd as a magnetic refrigerant. Total entropy generation is composed of conduction and convection heat transfer, pressure drop. The pressure drop is the most dominant mechanism of the entropy generation in the AMR when helium gas is utilized as the heat transfer medium and the convection heat transfer contributes on the axial distribution of entropy generation. The performance and efficiency of the AMR is examined according to various operating conditions.
극저온 냉동기에 의해 냉각되는 열사이펀의 과도 열전달 특성에 대한 연구
김영권(Youngkwon Kim),정상권(Sangkwon Jeong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In conduction-cooled superconducting magnets, thermosiphon can be used for interconnecting the cryocooler and the superconducting magnet. The working fluid of the thermosiphon experiences large temperature and pressure variations with its physical properties during the cool-down process. In this study, a cryogenic thermosiphon cooled by a stirling cryocooler is designed, fabricated and tested to investigate on the transient operation characteristics. The temperature and pressure of the working fluid inside the thermosiphon is measured during the whole cool-down process. From the experimental results about thermohydraulic condition of the thermosiphon, modeling of its operation process is carried out to predict thermal performance of the thermosiphon. The appropriate modeling with physical explanation is presented and verified by numerical simulation in this paper.