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Yb<sub>2</sub>O<sub>3</sub>가 첨가된 (Ba<sub>1</sub>Sr<sub>1</sub>Ca)TiO<sub>3</sub>후막의 치밀화와 유전특성
박상만,이영희,남성필,이성갑,Park, Sang-Man,Lee, Young-Hie,Nam, Sung-Pil,Lee, Sung-Gap 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
[ $(Ba_{0.57}Sr_{0.33}Ca_{0.10})TiO_3$ ] (BSCT) powders, prepared by sol-gel method, were mixed with organic vehicle and the BSCT thick films were fabricated by the screen printing method. The structural and dielectric properties were investigated as a function of the $Yb_2O_3$ doping contents. As a result of the TG-DTA, exothermic peak was observed at around $670^{\circ}C$ due to the formation of the polycrystalline perovskite phase. All BSCT thick films showed the typical XRD patterns of a cubic polycrystalline structure. The average thickness of all BSCT thick films was about $70{\mu}m$. The grain size of the BSCT thick film doped with 0.7 mol% $Yb_2O_3$ was approximately $6.2{\mu}m$. The Curie temperature and relative dielectric constant at room temperature decreased with increasing $Yb_2O_3$ amount. Relative dielectric constant and dielectric loss of the specimen doped with 0.1 mol% $Yb_2O_3$ were 4637 and 19 % at Curie temperature, respectively.
박상만(Sang-Man Park) 신영어영문학회 2009 신영어영문학 Vol.42 No.-
Sincerity and Authenticity is essentially beyond summary, because its value consists largely in detailed nuance and variation. But we need to distinguish between sincerity and authenticity to a point of high focus in order to bring into the glare of the explicit some of the implication we gather from this book. Sincerity is a social virtue, a compact between me, myself, and you; authenticity is an assertion and defiance to cut away the falsities of culture. Sincerity speaks for a conduct of should; authenticity a repudiation of its bad faith. Sincerity implies a recognition of our limits, while authenticity asserts the self as absolute. Sincerity belongs to an attribute of Romanticism, authenticity to training of Modernism. The ground on which Trilling makes his judgement issues from rooted conviction. He wants people to uphold character. He has pursued the intention of sustaining the authenticity of human existence that formerly had been ratified by God. It is his purpose to keep all things and, above all our self from becoming “weightless.”
폴리다이아세틸렌-폴리다이메틸실록산 기반의 클로로포름 검출센서
박인성(In Sung Park),박동훈(Dong-Hoon Park),김종만(Jong-Man Kim) 한국고분자학회 2016 폴리머 Vol.40 No.5
본 연구에서는 용매변색성을 지니는 폴리다이아세틸렌(polydiacetylene, PDA)을 중합하여 이를 함유한 폴리다이메틸실록산(polydimethylsiloxane, PDMS) 기반의 필름센서를 개발하였으며 이를 이용하여 클로로포름에서의 용매변색을 확인하였다. 다이아세틸렌(diacetylene, DA) 단량체인 2-methoxyethyl pentacosa-10,12-diynoate(PCDA-EGME)를 합성하고 저온에서 254 nm UV를 조사하여 PDA를 광 중합한 후, 이를 PDMS에 내포시켜 필름 센서를 제조하였다. 필름형 센서는 적색(λmax=545 nm)을 띠고 있으며, 센서를 클로로포름에 노출시키면 황색(λmax=477 nm)으로 변하는 것을 관찰하였다. 총 19 종의 용매 중 클로로포름에서 선택적으로 변색이 발생하였으며 이를 이미지 분석을 통해 CMYK 중 yellow, magenta 값을 추출하여 차이 값을 분석하였다. In this study, we have developed a solvatochromic polydiacetylene(PDA)-embedded polydimethylsiloxane (PDMS) film-type sensor for selective colorimetric detection of chloroform. PDA-PDMS film was readily fabricated by mixing PDA which was derived from 2-methoxyethyl pentacosa-10,12-diynoate (PCDA-EGME) and PDMS precursor. The PDA embedded PDMS film displayed a red (λmax=545 nm) to yellow (λmax=477 nm) colorimetric transition upon exposure to chloroform. The film-type sensor was found to be selective for chloroform among 19 common solvents.
배터리 냉각 플레이트의 성능 예측을 위한 비정상 전산유동해석 및 실험적 연구
박상환(Sang Hwan Park),장경식(Kyoungsik Chang),조홍영(Hong Young Cho),정희석(Hui Seok Jeong),손성만(and Sung Man Sohn) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
본 논문에서는 전기자동차용 배터리 모듈의 방열을 위해 냉각 플레이트를 이용한 수랭식 냉각방식을 전산유체역학과 실험적 방법을 이용하여 연구하였다. 냉각 플레이트의 냉각 성능을 향상시키기 위해 내부 유로 형상을 변경하였으며 전산유동해석을 통해 성능을 예측하였다. 냉각 플레이트와 발열패드를 이용하여 간이 실험을 수행하였으며, 실험 결과와 비교를 위해 비정상 유동해석을 진행하여 입·출구 온도 차를 이용한 방열량을 계산하였다. 전산열유동해석을 통하여 개선된 유로 형상이 11.5% 더 높은 방열 성능을 예측하였으며 실험 결과인 11.9% 방열량과 비슷한 결과를 얻을 수 있었다. In the present work, water cooling system with a cooling plate was studied for cooling of lithium-ion battery module in electric vehicles. In order to improve the cooling performance of the cooling plate, the shape of the internal flow path was re designed based on the original straight channel type. The performance was predicted through computational flow analysis. Unsteady flow analysis was performed for comparison of cooling performance of both types. The heat was calculated with temperature difference between inlet and outlet of water at the cooling plate. Also simple experiment with cooling plate and heating pad was conducted. The improved cooling plate predict 11.5% higher performance in CFD, which is similar with experimental results, 11.9% higher performance.
배터리 모듈 냉각 플레이트의 냉각 성능 예측을 위한 비정상 전산유동해석 및 실험적 연구
박상환(Sang Hwan Park),장경식(Kyoungsik Chang),조홍영(Hong Young Cho),정희석(Hui Seok Jeong),손성만(Sung Man Sohn) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.7
전기에너지를 사용하는 친환경자동차에서는 리튬 이온 배터리가 주로 사용되고 있으며 별도의 냉각 장치를 필수적으로 설치하여야 한다. 본 논문에서는 냉각 플레이트를 이용한 수랭식 냉각방식을 연구하였다. 냉각 플레이트의 냉각 성능을 향상시키기 위해 내부 유로 형상을 개선하였고 전산유동해석을 통해 성능을 예측하였다. 실험 결과와 비교를 위해 비정상 유동해석을 진행하였고 냉각 성능 비교는 입·출구 온도 차를 이용한 방열량을 계산하여 비교하였다. 전산해석을 통해 개선된 유로 형상이 11.47% 더 높은 방열량을 예측하였다. 실험을 통해 냉각 플레이트의 성능을 측정하고 전산해석 결과를 검증하였다. 실험 결과 11.86%의 더 높은 방열량을 나타냈으며 전산유동해석과 5% 이내의 오차를 보였다. Electric vehicles mainly use lithium-ion batteries, and a cooling system must be installed in them. In this study, a water-cooling system that uses a cooling plate was studied. The shape of the internal flow path was improved to enhance the performance of the cooling plate; the performance was predicted using computational flow analysis. Unsteady flow analysis was performed to compare the experimental results, and the cooling performances were compared by calculating the amounts of rejected heat using the inlet and outlet temperature differences. The improved flow-path shape showed an 11.47 times higher amount of rejected heat. The performance of the cooling plate was also measured through an experiment, and the computational analysis result was verified. An 11.86 times higher amount of rejected heat and an error within 5% were obtained in the computational flow analysis.
박성만(Sung Man Park),김상덕(Sang Duk Kim),정춘석(Chun Suk Jung),이창원(Chang Won Lee),김재웅(Jae Woong Kim),정상원(Sang Won Jung) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
전기자동차의 효율을 증대하기 위하여 많은 방법이 시도되었다. 시도한 중요관심사 중 하나가 난방시스템의 효율 증대이다. 그럼에도 불구하고 많은 효과를 보여주지 못하였다. 일반적으로 기존 차량에서의 난방시스템은 크게 중요하지 않았다. 차량의 엔진에서의 발열을 이용하였기 때문이다. 본 연구에서는 일반적인 PTC 시스템을 제어 방법을 지능제어 방법을 통하여 높은 에너지 효율을 얻었다. In order to improve efficient quality of EV, lot of methods has been tried. One of the main concerns in attempting is to increase the Heating system. Nevertheless not much improvement has been achieved. Generally the heating system in vehicle is not important. Because of vehicle heating system is used to engine temp. Remarkable energy efficient of development system from conventional PTC is demonstrated both in simulation and experiment as well.
스크린 프린팅법으로 제작한 PZT 후막의 치밀화와 전기적 특성
박상만,이성갑,Park, Sang-Man,Lee, Sung-Gap 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.7
Ferroelectric $Pb(Zr_{0.52}Ti_{0.48})O_3$ (PZT(52/48)) thick films were fabricated by the screen-Printing method on the alumina substrates, and $PbTiO_3$ (PT) Precursor solution, which prepared by sol-gel method, was spin-coated on the PZT(52/48) thick films to obtain a densification. Its structural and electrical properties of the PZT(52/48) thick films with the treatment of PT precursor solution coating were investigated. The particle size of the thick films was increased with increasing the number of coatings and the thickness of the PZT-6 (6: number of coatings) films was about $60{\mu}m$. The relative dielectric constant increased and the dielectric loss decreased with increasing the number of PT sol coatings. The relative dielectric constant and dielectric loss of the PZT-6 thick film were 475 and 2 %, respectively. The remanent polarization, coercive field and breakdown strength of the PZT-6 film were $32.6{\mu}C/cm^2$, 15 kV/cm and 60 kV/cm, respectively.
Pb(Zr<sub>0.7</sub>Ti<sub>0.3</sub>)O<sub>3</sub> 후막의 강유전 특성에 전구체 용액의 코팅요소가 미치는 영향
박상만,윤상은,이성갑,Park, Sang-Man,Yun, Sang-Eun,Lee, Sung-Gap 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
The influence of the concentration of precursor solution and the number of solution coatings on the densification of the $Pb(Zr_xTi_{1-x})O_3$ (PZT) thick films was studied. PZT powder and PZT precursor solution were prepared by3 sol-gel method and PZT thick films were fabricated by the screen-printing method on the alumina substrates. The composition of powder and precursor solution were PZT(70/30) and PZT(30/70), respectively. The PZT precursor solution was spin-coated on the PZT thick films. A concentration of a coating solution was 0.5 to 2.0 mol/L[M] and the number of coating was repeated from 0 to 6. The XRD patterns of all PZT thick films shelved typical perovskite polycrystalline structure. The porosity of the thick films was decreased with increasing the number of coatings and 6-time coated films with 1.5 M showed the dense microstructure and thickness of about $60{\mu}m$. The relative dielectric constant of the PZT thick film was increased with increasing the number of solution coatings and the thick films with 1.5 M, 6-time coated showed the 698. The remanent polarization the 1.5 M and 6-time coated PZT thick films was $38.3{\mu}C/cm^2$.