Thermoelectric Properties of PEDOT:PSS Thin Films Using an Organic polar sovlent

이관원,김현빈,윤진문,오승환,홍성권,강필현 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.1

Enhanced thermoelectric properties of PEDOT;PSS Thin films via spin-coating method

이관원,이병민,김현빈,윤진문,오승환,홍성권,강필현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Thermoelectric performance, the dimensionless figure of merit (ZT= σ S2T/κ) and power factor (PF=σS2) were determined by Seebeck coefficient (S), electrical conductivity (σ), and thermal conductivity (κ). For organic thermoelectric materials, an effective approach of enhancement their thermoelectric properties is to increase Seebeck coefficient and electrical conductivity because of organic materials have inherently low κ. A dispersion poly(3,4-ethylenedioxylthiophene):poly(styrenesulfonate) (PEDOT:PSS) was spin-coated on a glass substrate and then dried at 130°C for 15 min. After PEDOT:PSS thin films were cooled, organic polar solvents (DMAc, DMF, DMSO, and NMP) were spin-coated on the surface of PEDOT:PSS thin films. To characterize PEDOT:PSS thin films, analytical methods were used such as electrical conductivity, Seebeck coefficient, sheet resistance, Thin films thickness, UVvis- NIR, raman, XPS, and AFM.

이식된 표적항원인 Histone에 의해 유발된 면역매개성 내이장애

박경유,조진생,김준우,이관원,이창훈,KojiHozawa,TomonoriTakasaka 대한이비인후과학회 2002 대한이비인후과학회지 두경부외과학 Vol.45 No.6

Background and Objectives:Histones, a set of highly cationic proteins esentially involved in the binding and packing of DNA in the cell nucleus chromatin, have five subclasses (H1, H2a, H2b, H3, H4) in mamalian animals. These components play the most important role in producing autoantibody in SLE and etc. Some studies proposed that there were a relationship betwen the activity of the disease and the titer of these autoantibody. Recently, histones were revealed to be involved in the immune deposit on GBM in MRL/lpr mice, and cause immune-mediated glomerulonephritis in normal animals. Materials :We examined IgG deposition on the basement membrane of strial capillaries and recorded the endocochlear potential from the basal turn by an electrode inserted though the round window in guinea pigs which was injected by histone (H2a) and anti-histone antisera. Results:IgG depositions were sen on the basement membrane of stria capillaries. IgG was also found to be accumulated on the extravascular side of the basement membrane. However, C3 was almost never observed in the stria vascularis of histone and the anti-histone antisera injected group. In these animals, intracellular edema was evi-The signifcant decrease in EP was observed just after the injection of anti-histone antisera in the animals receiving an intra-arterial injection of histones. Conclusion:This study indicated that cationic antigen could be trapped on the negatively charged basement membrane of strial capillaries, leading to the in situ immune complex formation, and eventually causing immune-mediated hearing loss. (Korean J Otolaryngol 2002;45:574-8)

단일 폭발음 자극 후 기니아픽 와우세포의 형태학적 변화

조진생,박경유,김진용,김준우,이관원,이창훈,이병권 대한이비인후과학회 2002 대한이비인후과학회지 두경부외과학 Vol.45 No.9

Background and Objectives:studies. The morphological changes in a noise stimulated model show various features relating to the duration of the exposure and sound intensity. Until now there had been a lot of the morphological studies on noise induced hearing loss models, but only a few reports of single blast injury of more than 150 dB. Materials and Method:We observed with a transmission electron microscope by using the microslicing technique for minimizing the tissue injury and sucesful hair cell counting in Results:The area of hair cell damage in L.M. showed stereocilia bending at 24 hours, proliferation of Hensens body, subsurface cistern in outer hair cell and mitochondria proliferation in inner hair cell within 2wks. The area of no hair cell damage in L.M. showed minimal changes in E.M., as well. Conclusion:These results suggest that the 178 dB single blast wave injury may not cause severe distortion of the organ of Corti in the guinea pig and thus the compensation process can be advanced gradualy. (Korean J Otolaryngol 2002;45:839-45)

나선형 CT와 16 Slice MDCT의 Brain과 Abdome 검사 시 산란선에 관한 연구

윤재혁(Jae hyeok Yun),류병규(Byeong gyu Ryu),이관원(Gwang won Lee),김동수(Dong su Kim),장양선(Yang seon Jang),구양수(Yang su Ku) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

Purpose The present study purposed to measure the degree of scattered ray of radiation in spiral CT and 16-Slice MDCT of brain and abdomen using Rando phantom and to examine the change in non-patients’ exposure to scattered ray according to distance between the central beam and the patient and the reduction of exposure according to the thickness of a protection outfit for shielding from radiation. Materials and methods We measured the change of scattered ray on non-patients according to distance between the brain beam of CT and the patient and the change of scattered ray according to the thickness of an apron for shielding from scattered ray, assuming a critically ill patient and an infant on Somatom Plus 4 and MDCT table at the present hospital using Rando phantom under the same setting of cerebral and abdominal CT scan parameters. In order to reduce errors in measurements, each factor was measured three times and the mean value was obtained. The height of the survey meter probe was 111.5cm, which is ordinary adults’ iliac crest level. Results A. In the result of brain test with Plus 4, the reduction rate of scattered ray at a distance of 50cm according to distance from the central beam without an apron (15.5mR) and with an apron on: 1. When Pb equivalent was 2.5mm, the reduction rate of scattered ray was 91.55% at 50cm, 94.82% at 100cm, 98.64% at 150cm, and 99.38% at 200cm. 2. When Pb equivalent was 5.0mm, the reduction rate of scattered ray was 98.50% at 50cm, 99.26% at 100cm, 99.58% at 150cm, and 99.70% at 200cm. 3. When Pb equivalent was 7.5mm, the reduction rate of scattered ray was 98.87% at 50cm, 99.37% at 100cm, 99.79% at 150cm, and 99.80% at 200cm. B. In the result of brain test with 16-Slice MDCT, the reduction rate of scattered ray at a distance of 50cm according to distance from the central beam without an apron (16.47mR) and with an apron on: 1. When Pb equivalent was 2.5mm, the reduction rate of scattered ray was 95.40% at 50cm, 97.69% at 100cm, 98.84% at 150cm, and 99.33% at 200cm. 2. When Pb equivalent was 5.0mm, the reduction rate of scattered ray was 98.54% at 50cm, 99.18% at 100cm, 98.54% at 150cm, and 99.66% at 200cm. 3. When Pb equivalent was 7.5mm, the reduction rate of scattered ray was 98.10% at 50cm, 99.55% at 100cm, 99.86% at 150cm, and 99.78% at 200cm. C. In the result of abdomen test with Plus 4, the reduction rate of scattered ray at a distance of 50cm according to distance from the central beam without an apron (61.47mR) and with an apron on: 1. When Pb equivalent was 2.5mm, the reduction rate of scattered ray was 91.52% at 50cm, 97.15% at 100cm, 98.74% at 150cm, and 99.40% at 200cm. 2. When Pb equivalent was 5.0mm, the reduction rate of scattered ray was 98.48% at 50cm, 99.19% at 100cm, 99.60% at 150cm, and 99.72% at 200cm. 3. When Pb equivalent was 7.5mm, the reduction rate of scattered ray was 98.81% at 50cm, 99.49% at 100cm, 99.71% at 150cm, and 99.82% at 200cm. D. In the result of abdomen test with 16-Slice MDCT, the reduction rate of scattered ray at a distance of 50cm according to distance from the central beam without an apron (79.47mR) and with an apron on: 1. When Pb equivalent was 2.5mm, the reduction rate of scattered ray was 96.56% at 50cm, 98.64% at 100cm, 99.34% at 150cm, and 99.69% at 200cm. 2. When Pb equivalent was 5.0mm, the reduction rate of scattered ray was 98.96% at 50cm, 99.45% at 100cm, 99.72% at 150cm, and 99.85% at 200cm. 3. When Pb equivalent was 7.5mm, the reduction rate of scattered ray was 99.56% at 50cm, 99.75% at 100cm, 99.86% at 150cm, and 99.94% at 200cm. Conclusion According to the results of this study, scattered ray decreased with the increase of distance. The scattered ray shielding effect was highest when the Pb equivalent of the radiation shielding outfit was 7.5mm. However, the reduction rate of scattered ray with a radiation shielding outfit at thickness of 5.0mm was higher (+4% on the average) than that with an outfit a