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정인수(I. S. Jung),이영규(Y. G. Lee),한용식(Y. S. Han),김종진(J. J. Kim),정희택(H. T. Chung) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In the present study, the numerical simulation has been performed to predict the performance of the fire suppression system for cabin of shipboard enclosure. The open numerical code was used for the present simulation named as FDS(Fir Dynamic Simulator). Application has been done to predict the interaction between water mist and fire plume. In this study, the passenger cabin was chosen as simulation space. The computational domains for simulation in the passenger cabin were considered the fire scenario of IMO rules. The full scale of the flow field is W×L×H=4×3×2.4 ㎥ with a dead zone of W×L×H=1.22×1.1×2.4 ㎥. The water mist nozzle is installed in ceiling center or z.3m height from the floor, and there are six mattresses and four cushions in the simulation space. The five types of nozzle cluster were simulated in the study. Numerical results showed that C2-type is the most effective on fire suppressing.
정인수(I.S. Jung),정희택(H.T. Chung),한용식(Y.S. Han) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.4
The numerical simulation has been performed to predict the performance of the fire suppression system for cabin of shipboard enclosure. The present study aims ultimately at finding the optimal parametric conditions of the mist-injecting nozzles using the CFD methods. The open numerical code was used for the present simulation named as FDS (Fire Dynamics Simulator). Application has been done to predict the interaction between water mist and fire plume. In this study, the passenger cabin was chosen as simulation space. The computational domains for simulation in the passenger cabin were determined following the fire scenario of IMO rules. The full scale of the flow field is W×L×H=4×3×2.4 m³ with a dead zone of W×L×H=1.22×1.1×2.4 m³. The water mist nozzle is installed in ceiling center of 2.3 m height from the floor, and there are six mattresses and four cushions in the simulation space. The combination patterns of orifices to the main nozzle and the position to install nozzles were chosen as the simulation parameters for design applications. From the present numerical results, the centered-located nozzles having evenly combined orifices were shown as the best performance of fire suppression.
송도선(D. S. Song),정인수(I. S. Jung),정중수(J. S. Chung),정광욱(K. W. Jung) 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-
본 논문에서는 교육용 WiMAX 시스템의 소프트웨를 설계, 구현하고자 한다. 구현하는 소프트웨어에서는 기지국과 단말간 채널 액세스 브로드캐스팅 메시지를 구성하고 초기 레인징을 실현을 포함한다. 기지국과 단말의 교육용 초기 레인징 소프트웨어 설계시 프로세서를 PPC405로/Montavister Linux를 운영체제로, 컴파일 및 디버깅을 DevRocket로, 개발언어를 C로 채택한다. 개발한 소프트웨어는 WiMAX장비의 초기 레이징을 위한 RNG-REQ, RNG-RSP MAC 메시지의 디코딩 코드의 개발을 실현하여 복잡하고 어려운 WiMAX의 초기 레인징을 초보자들이 잘 이해하고 응용할 수 있다. In this paper, the educational software of WiMAX system is presented. The software includes initial ranging and hannel access roadcast messaging between a terminal and a base station. In the design of initial ranging software we dopted the PPC405 as processor, Montavister linux as OS(Operating System), DevRocket as compiler and debugging ool, and C-language as basic development language tool. Especial1y, the designed software can be useful1y applied for ser to decode and design other systems.
포스터 전시 : 위장관 ; 비스테로이드성 소염진통제에 의한 장염 1예
이은규 ( E. K. Lee ),박영숙 ( Y. S. Park ),정인수 ( I. S. Chung ),서유승 ( Y. S. Seo ),박준섭 ( J. S. Park ),이정돈 ( J. D. Lee ),김태헌 ( T. H. Kim ),주연호 ( Y. H. Joo ),이진혁 ( J. H. Lee ),김완섭 ( W. S. Kim ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
<서론> 비스테로이드성 소염진통제는 대장에 비특이성 장염을 일으키거나 기왕의 대장 질환을 악화시키는 것으로 알려져 있다. 장염을 일으키는 기전은 아직 분명치 않으나 점막의 투과성 증가가 선행될 것으로 생각되고 있다. 임상적으로는 만성 설사, 체중 감소, 철 결핍성 빈혈 및 저단백 혈증을 보이며 이들의 대장 내시경 소견은 정상에서 궤양 및 협착에 이르기까지 다양하게 보고되고 있다. 이들의 조직학적 소견은 만성 염증세포의 침착을 보여 현미경적 장염과 유사하
정인수(I. S. Jung),이영규(Y. G. Lee),이창효(C. H. Lee),정희택(H. T. Chung) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
In the present study, numerical simulation has been performed to investigate the flow characteristics around the injecting nozzles which are the key parts of water mist fire suppression system. In the water mist fire suppression system (WMFSS), the fine mist droplets smaller than 1,000μmissued from the water mist nozzles suppress the fire plume by the direct cooling, oxygen displacement and attenuation of thermal radiation. For simulation of flow characteristics, the commercial CFD software, named as CFX and FLUENT, were used with the proper modeling. CFX was applied for analyzing the internal flow and FLUENT was applied for analyzing the external flow of water mist nozzles. The flow characteristics of the water mist nozzle found out in this study could be used for predicting the performance of the water mist nozzles for the fire suppression system.
디퓨저 깃배치각의 변화에 따른 원심압축기의 공력성능 특성에 관한 수치 연구
박태규(T.G. Park),정인수(I.S. Jung),정희택(H.T. Chung),박준영(J.Y. Park),김세미(S.M. Kim),백제현(J.H. Baek) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In the present study, the effects of the stagger angles on the aerodynamic performances in the vaned centrifugal compressor has been investigated by CFD methods. The diffuser vane angles were varied in the range of ±10 deg. from the initial-design points. The commercial Navier-Stokes solver, ANSYS-CFX were applied to solve the impeller-diffuser flowfields. Through the numerical results, the desirable setting angles were proposed to fit the best performance to the variation of the operating conditions.
CFD를 이용한 유류탱크용 회전형 제트 교반기의 유동장 해석에 관한 연구
한종호 (J. H. Han ),정인수 (I. S. Chung ),최윤환 (Y. H. Choi ),정희택 (H. T. Chung ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The present study has been aimed at analyzing the cleaning effect of the rotary jet mixer which is established in the oil tank. The simulation program is CFX that is widely used to simulate the flow of thermal and fluid. The object of the study is to obtain the best cleaning condition of the jet mixer with respect to two simulation factors. The first factor is the injection angle with range from 0° to 30° and the second factor is the rotating speed with range from 1/360 to 1/120 (RPM). The numerical results were analyzed in term of the intensity of the jet streams.