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김종관(J.K. KIm),장근식(K.S. Chang) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
The present paper explains some advancement made by the authors for the compressible flow computation of the Euler equations based on the unstructured grid and vertex centered finite volume method. Accurate solutions to the unsteady axisymmetric shock wave propagation problems and three-dimensional airplane flows have been obtained by a high-order upwind TVD and FCT schemes. Unstructured grid adaption is made for the unsteady shock wave problems by the dynamic h-refinement/unrefinement procedure and for the three-dimensional steady flows by the Delaunay point-insertion method to generate three-dimensional tetrahedral mesh enrichment. Some physics of the shock wave diffraction phenomena and three-dimensional airplane flow are discussed.
멀티코어 시스템에서 쓰레드 수에 따른 CFD 코드의 OpenMP 병렬 성능
김종관(J.-K. Kim),장근진(K.-J. Jang),김태영(T.Y. Kim),조덕래(D.-R Cho),김성돈(S.-D. Kim),최정열(J.-Y. Choi) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.1
OpenMP is becoming more and more useful as a simple parallel processing paradigm on SMP (Shared Memory Multi-Processors) computing environment with the development of multi-core processors. However, very few data is available publically regarding the OpenMP performance in CFD (Computational Fluid Dynamics). In the present study a CFD test suite is prepared for the performance evaluation of OpenMP on various multi-core systems. The test suite is composed of two-dimensional numerical simulations for inviscid/viscous and reacting/non-reacting flows using three different levels of grid systems. One to five test runs were carried out on various systems from dual-core dual threads to 16-core 32-threads systems by changing the number of threads engaged for each test up to 80. The results exhibit some interesting results and the lessons learned from the tests would be quite helpful for the further use of OpenMP for CFD studies using multi-core processor systems.
김종관(J.-G. Kim),장근진(G.-J. Jang),김성돈(S.-D. Kim),최정열(J.-Y. Choi),권민찬(M. C. Kwon),김명호(M.-H. Kim) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
압축성 유체역학 이론에 기초한 초음속 공기 흡입구 개념설계 및 탈설계점 성능 예측 프로그램을 개발하였으며, batch 프로세스를 이용하여 별도의 상용 프로그램을 이용한 후처리까지 일괄 처리하도록 패키지를 구성하였다. 본 논문에서는 마하수 3.0 조건에서 출입구 면적비에 따른 축대칭 및 사각형 흡입구 설계 결과를 제시하였으며, 이 결과를 바탕으로 한 탈설계점 성능 예측 결과를 제시하였다. A design tool is developed for the conceptual design of the supersonic air intake based on the compressible fluid dynamics theories. A performance prediction tool is also incorporated into to the code to evaluate the performance at off-design conditions. The package includes the post-processing by a separate commercial program by using a batch process. Axi-symmetric and rectangular intake designs are presented at Mach number 3.0 flight condition using the ratio of exit area /capture area as design variable. The off-design performance of the designs are also presented.
UV/O₃와 O₃로 처리된 ITO의 표면 특성과 OLED 소자 특성
김일(IL Kim),유도현(D.H. You),박구범(G.B. Park),육재호(J.H. Yuk),박종관(J.K. Park),조기선(G.S. Jo),이덕출(D.C. Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this research We investigated the effect of UV/O₃, O₃ treatments of indium-tin oxide(ITO) surface on the performance of organic light emitting devices(OLEDs). The fundamental structure of OLEDs was ITO(anode) / TPD(Hole Transport Layer) / Alq₃ / Al(cathode). We performed UV/O₃, O₃ treatments and found that both treatments enhanced the performance of OLEDs. Current-Voltage, Luminance-Voltage characteristics were measured at room temperature.
멀티코어 시스템에서 thread 수에 따른 CFD 코드의 OpenMP 병렬 성능
김종관(J.-K. Kim),장근진(K.-J. Jang),김태영(T.Y. Kim),최정열(J.-Y. Choi) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
OpenMP is becoming more and more useful as a simple parallel processing paradigm on SMP (Shared Memory Multi-Processors) computing environment with the development of multi-core processors. However, very few data is publically available regarding the OpenMP performance in CFD (Computational Fluid Dynamics). In the present study a CFD test suite is prepared for the performance evaluation of OpenMP on various multi-core systems. The test suite is composed of two-dimensional numerical simulations for inviscid/viscous and reacting/non-reacting flows using three different levels of grid systems. One to five test runs were carried out on various systems from dual-core dual threads to 16-core 32-threads systems by changing the number of threads engaged for each test up to 80. The results exhibit some interesting results and the lessons learned from the tests would be quite helpful for the further use of OpenMP for CFD studies using multi-core processor systems.