http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Thermal analysis of PT IGBT by using ANSYS
Sehwan Ryu,Hyungkeun Ahn,Deukyoung Han,Mahmoud El. Nokali 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
As the power density and switching frequency increase, thermal analysis of power electronics system becomes imperative. The analysis provides valuable information on the semiconductor rating, long-term reliability and efficient heat-sink design. In this paper, the thermal model and thermal distribution of discrete Insulated Gate Bipolar Transistor with non heat-sink and heat-sink has been studied. For analysis of thermal distribution, we obtained results by using finite element simulator, ANSYS and compared with experimental data.
Transient Analysis of PT-IGBTs at High Temperature
Sehwan Ryu,Hokil Lee,Hyungkeun Ahn,Deuk-Young Han 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
In this paper, excess minority carrier distribution in drift and buffer layers and accumulated charges for PT IGBT have been, for the first time, analytically expressed with different transient times, lifetimes and temperatures Furthermore those parameters are also expressed with temperature to predict the transient response which are critical to the real operation Active base region has been chosen to extract the temperature dependency of the device by including the buffer layer which is important but neglected due to the complexity up to now.<br/>
An Analytical Transient Model for NPT IGBT
SeHwan Ryu,HyungKeun Ahn,Deuk Young Han 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
In this paper, transient characteristics of IGBT has been analytically solved to express the excess minority carrier distribution in active base region and the output voltage. Non-Punch Through(NPT) structure has been selected to prove the validity of the model. It is based on the equivalent circuit of MOSFET which supplies a low gain and a high level injection to the base of BJT None of the quasi static conditions have been assumed to trace the transient characteristics The basic elements of the model have been derived from the ambipolar transport theory.<br/> Theoretical predictions of the output voltages have been obtained with different lifetimes and compared with experimental and theoretical results available in the literature From the analytical approach, good agreement has been obtained to provide reliable and fast output of the device.
유한 요소 도구를 이용한 NPT IGBT의 열 특성 해석
류세환(Sehwan Ryu),이명수(Myungsoo Lee),원창섭(Changsub Won),안형근(Hyungkeun Ahn),한득영(Deukyoung Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
As the power density and switching frequency increase, thermal analysis of power electronics system becomes imperative. The analysis provides valuable information on the semiconductor rating, long-term reliability. In this paper, thermal distribution of the Non Punchthrough(NPT) Insulated Gate Bipolar Transistor has been studied. For analysis of thermal distribution, we obtained results by using finite element simulator, Ansys and thermal distributions form experiments.
Interrelation of Cyclin D1, Cyclin E, and p27Kip1 Expression on Tissue Arrays of Breast Cancer
Sehwan Han,Young-Duck Kim,Hong-Yong Kim,Hong-Joo Kim,Kyeongmee Park,Byung-Noe Bae,Suk Yong Ryu,Ki Hwan Kim 대한암학회 2002 Cancer Research and Treatment Vol.34 No.5
Purpose: To evaluate the clinical impact of the alteredexpression of cell cycle regulators in stage I and II breastcancers.Materials and Methods: The interaction between cyclinD1/E and p27Kip1 expressions were analyzed usingtissue microarray (TMA) technology in 133 breast cancers.Data from the immunohistochemical assays of 3molecules were merged, and analyzed, with a Ki67labeling index of the same tumors.Results: Cyclin D1 was expressed in 72 breast carcinomas(54.1%) and cyclin E in 60 (45.1%) out of the 133breast carcinomas. Expressions of cyclin D1 and cyclinE were inversely related to each other, and significantlyassociated with the estrogen receptor (ER) expressionand differentiation of the breast carcinoma. The expressionof cyclin E was significantly decreased in tumorsexpressing cyclin D1 (p=0.022). There was a trend forcyclin D1 expression to increase in tumors expressingp27Kip1 (p=0.053), but the expression of cyclin E didnot correlate with p27Kip1 expression. The Ki67 labelingindex was markedly increased in tumors expressing cyclinE, whereas it was significantly decreased in the cyclin D1or p27Kip1 expressing-tumors. From survival analysis,cyclin E expression was the only significant variable forthe prediction of poor survival.Conclusion: The abnormal expressions of cell cycleregulatory molecules are prevalent, and interrelated witheach other in breast cancer. Integration of TMA technologyallowed a high-throughput analysis for correlating molecularthe in situ findings, with the clinico-pathologicinformation. Among the three molecules studied, thecyclin E had a prognostic implication for stage I and IIbreast cancer. (Cancer Res Treat. 2002;34:388-393)
멀티모달 인터페이스(3차원 시각과 음성)를 이용한 지능적 가상검객과의 전신 검도게임
윤정원(Jungwon Yoon),김세환(Sehwan Kim),류제하(Jeha Ryu),우운택(Woontack Woo) 한국정보과학회 2003 정보과학회 컴퓨팅의 실제 논문지 Vol.9 No.4
This paper presents an immersive multimodal Gumdo simulation game that allows a user to experience the whole body interaction with an intelligent cyber fencer. The proposed system consists of three modules: (i) a nondistracting multimodal interface with 3D vision and speech (ii) an intelligent cyber fencer and (iii) an immersive feedback by a big screen and sound. First, the multimodal interface with 3D vision and speech allows a user to move around and to shout without distracting the user. Second, an intelligent cyber fencer provides the user with intelligent interactions by perception and reaction modules that are created by the analysis of real Gumdo game. Finally, an immersive audio-visual feedback by a big screen and sound effects helps a user experience an immersive interaction. The proposed system thus provides the user with an immersive Gumdo experience with the whole body movement. The suggested system can be applied to various applications such as education, exercise, art performance, etc. 본 논문에서는 멀티모달(multi-modal) 인터페이스를 통해 지능적 가상검객과 체감형 검도게임을 할 수 있는 시스템을 제안한다. 제안된 검도게임 시스템은 멀티모달 인터페이스(시각과 청각), 인공지능(AI), 피드백(스크린과 사운드) 등 크게 세 가지 모듈로 구성된다. 첫 번째로, 멀티모달 인터페이스는 시각기반 3차원 인터페이스를 이용하여 사용자가 자유롭게 3차원 공간에서 움직일 수 있도록 하고, 음성기반 인터페이스를 이용하여 사용자가 현실감 있는 검도게임을 즐길 수 있도록 한다. 두 번째, 인공지능은 가상검객에게 멀티모달 인터페이스에서 입력되는 시각과 음성를 인식하여 가상검객의 반응을 유도한다. 마지막으로, 대형 스크린과 스피커를 통한 시청각 피드백은 체감형 상호작용을 통하여 사용자가 몰입감을 느끼며 검도게임을 경험할 수 있도록 한다. 따라서 제안된 시스템은 전신의 움직임으로 사용자에게 몰임감의 검도게임을 제공한다. 제안된 시스템은 오락 외에 교육, 운동, 예술행위 등 다양한 분야에 적용될 수 있다.