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김선경,이승현,김동수,Kim, Sun-Kyung,Lee, Seung-Hyun,Kim, Dong-Soo 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
Noise is a major cause of hearing loss in the air base. There are lots of risk factors of hearing loss including noise, and hearing loss can be accelerated by combined effects of these risk factors. Here in, we reviewed risk factors of hearing loss, and analysed key risk factors inducing hearing loss in the air base. Risk factors exacerbating hearing loss with noise were mainly investigated in this research because noise could not be an avoidable risk factor in the air base. Analysed data will contribute to make green environment minimizing hearing loss of pilots and supporting personnels in the air base.
김선경,박수련,장한권,장희동,Kim, Sun Kyung,Park, Su-Ryeon,Chang, Hankwon,Jang, Hee Dong 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.2
$CeO_2$ nanoparticles were prepared by a flame spray pyrolysis from aqueous solution of cerium nitrate. The morphology, structure crystallinity and specific surface area of as-prepared nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer-Emmett-Telle (BET). The $CeO_2$ nanoparticles about 5 nm in diameter showed a cubic fluorite structure and polyhedral morphology. The average particle size increased as the cerium nitrate concentration increased. UV absorption performance of the as-prepared nanoparticles was measured by UV-visible spectroscopy. UV absorption of $CeO_2$ nanoparticles was more effective than that of commercial $TiO_2$ nanoparticles. Effect of dopants such as Ti and Zn to $CeO_2$ nanoparticles on UV absorption properties was also investigated. In case of $Ti/CeO_2$, and $Zn/CeO_2$ nanoparticles, they showed a little higher UV absorption values compared with $CeO_2$ nanoparticles. The as-prepared nanoparticles can be promising materials with high UV absorption value.
분무열분해 공정에 의한 규산수용액으로부터 다양한 미세기공을 갖는 실리카 나노다공체 제조
김선경,이총민,장한권,장희동,Kim, Sun Kyung,Lee, Chongmin,Chang, Hankwon,Jang, Hee Dong 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.3
Nanoporous $SiO_2$ particles containing different pore volume and size were prepared from silicic acid by a spray pyrolysis. The pore size, pore volume and particle size could be controlled with varying the precursor concentration, reaction temperature, and amount of organic templates such as Urea and poly ethylene glycol (PEG). The pore size distribution, pore volume and specific surface area of as-prepared particles were analyzed by BET and BJH methods, and the average particle sizes were measured by a laser diffraction method. The nanoporous $SiO_2$ particles ranged $0.6-0.9{\mu}m$ in diameter were successfully synthesized and the average particle size increased as the silicic acid concentration increased. The morphology of nanoporous $SiO_2$ particles was spherical and pores ranged 1 - 40 nm in diameter were measured in the particles. In case of Urea added into silicic acid, it showed no much difference in the morphology, pore size and pore volume at different Urea concentration. On the other hand, when PEG was added, it was clearly observed that pore diameter and pore volume of the particles surface increased with respect to PEG concentration.
진공열처리 온도에 따른 GZO/Al 적층박막의 구조적, 전기적, 광학적 특성 변화
김선경(Sun-Kyung Kim),김승홍(Seung-Hong Kim),김소영(So-Young Kim),전재현(Jae-Hyun Jeon),공태경(Tae-Kyung Gong),윤대영(DaeYoung Yoon),최동용(DongYong Choi),최동혁(Dong-Hyuk Choi),손동일(Dong-Il Son),김대일(Daeil Kim) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.2
Ga doped ZnO (GZO)/Al bi-layered films were deposited on the glass substrate by RF and DC magnetron sputtering and then vacuum annealed at different temperatures of 100, 200 and 300℃ for 30 minutes to consider the effects of annealing temperature on the structural, electrical and optical properties of the films. For all depositions, the thicknesses of the GZO and Al films were kept constant at 95 and 5 nm, respectively, by controlling the deposition time. As-deposited GZO/Al bi-layered films showed a relatively low optical transmittance of 62%, while the films annealed at 300℃ showed a higher transmittance of 81%, compared to the other films. In addition, the electrical resistivity of the films was influenced by annealing temperature and the lowest resistivity of 9.8 × 10<SUP>?4</SUP> Ωcm was observed in the films annealed at 300℃. Due to the increased carrier mobility, 2.35 ㎠ V<SUP>?1</SUP>S<SUP>?1</SUP> of the films. From the experimental results, it can be concluded that increasing the annealing temperature enhanced the optical and electrical properties of the GZO/Al films.
전자빔 조사에 따른 GZO/TiO 2 박막의 특성 변화
김승홍 ( Seung Hong Kim ),김선경 ( Sun Kyung Kim ),김소영 ( So Young Kim ),허성보 ( Sung Bo Heo ),최동혁 ( Dong Hyu Choi ),손동일 ( Dong Il Son ),김대일 ( Dae Ll Kim ) 한국열처리공학회 2013 熱處理工學會誌 Vol.26 No.6
We have considered the influence of electron irradiation energy of 300, 600 and 900 eV on the stuctural,electrical and optical properties of GZO/TiO2 thin films prepared with RF magentron sputtering. The optical transmittance and electrical resistivity of the films were dependent on the electron`s irradiation energy. The electron irradiated GZO/TiO2 films at 900 eV are grown as a hexagonal wurtzite phase and the resistivity is decreased with electron irradiation energy. The GZO/TiO2 films irradiated at 900 eV shows the lowest resistivity of 4.3 × 10-3Ωcm. The optical transmittance in a visible wave length region also increased with the electron irradiation energy. The film that electron irradiated at 900 eV shows 82% of optical transmittance and higher work function of 5.18eV in this study.
Ag 완충박막 두께에 따른 IGZO/Ag 적층박막의 특성 변화
김소영 ( So Young Kim ),김선경 ( Sun Kyung Kim ),김승홍 ( Seung Hong Kim ),전재현 ( Jae Hyun Jeon ),공태경 ( Tae Kyung Gong ),최동혁 ( Dong Hyuk Choi ),손동일 ( Dong Il Son ),김대일 ( Dae Il Kim ) 한국열처리공학회 2014 熱處理工學會誌 Vol.27 No.5
IGZO/Ag bi-layered films were deposited on glass substrate at room temperature with radio frequencyand direct current magnetron sputtering, respectively to consider the effect of Ag buffer layer on the electrical,optical and structural properties. For all deposition, while the thickness of Ag buffer layer was varied as 10,15, and 20 nm, The thickness of IGZO films were kept at 100 nm, In a comparison of figure of merit, IGZO filmswith 15 nm thick Ag buffer layer show the higher figure of merit (1.1 × 10-2 Ω-1) than that of the IGZO single layerfilms (3.7 × 10-4 Ω-1). From the observed results, it is supposed that the IGZO 100 nm/Ag 15 nm bi-layered filmsmay be an alternative candidate for transparent electrode in a transparent thin film transistor device.
열처리공학회지,제27권 제1호(2014) : GZO/ZnO 적층박막의 두께변화에 따른 구조적, 전기적, 광학적 물성 변화
김승홍 ( Seung Hong Gong ),김선경 ( Dong Kyung Kim ),김소영 ( So Young Kim ),전재현 ( Jae Hyun Jeon ),공태경 ( Tae Kyung Gong ),최동혁 ( Dong Hyuk Choi ),손동일 ( Dong Ll Son ),김대일 ( Daeil Kim ) 한국열처리공학회 2014 熱處理工學會誌 Vol.27 No.1
Ga doped ZnO (GZO) single layer and GZO/ZnO bi-Iayered films were deposited on glass substrates by radio frequency magnetron sputtering and then the influence of film thickness on the structural, electrical. and optical properties of the films was considered, Thicknesses of the GZO/ZnO films was varied as GZO 100 nm, GZO 85 nm/ZnO 15 nm and GZO 70 nm/ZnO 30 nm, respectively The observed result means that optical transmittance and electrical resistivity of the films were influenced with film thickness and GZO 85 nm/ZnO 15 nm bilayered films show the higher figure of merit than that of the films prepared other films in this study,
Ag 중간층 두께에 따른 TiO2/Ag/TiO2 박막의 광학적 특성 변화
김소영 ( So Young Kim ),전재현 ( Jae Hyun Jeon ),공태경 ( Tae Kyung Gong ),김선경 ( Sun Kyung Kim ),최동혁 ( Dong Hyuk Choi ),손동일 ( Dong Il Son ),김대일 ( Dae Il Kim ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.2
TiO2/Ag/TiO2 trilayer films were deposited with radio frequency (RF) and direct current (DC) magnetron sputtering onto the glass substrate to consider the influence of Ag interlayer on the optical properties of the films. The thickness of TiO2 films was kept at 24 nm, while the thickness of Ag interlayer was varied as 5, 10, 15, and 20 nm. As-deposited TiO2 single layer films show the optical transmittance of 66.7% in the visible wavelength region and the optical reflectance of 16.5%, while the TiO2 films with a 15 nm thick Ag interlayer show the enhanced optical transmittance of 80.2% and optical reflectance of 77.8%. The carrier concentration was also influenced by Ag interlayer. The highest carrier concentration of 1.01 × 1023 cm-3 was observed for a 15 nm thick Ag interlayer in TiO2/Ag/TiO2 films. The observed result means that an optimized Ag interlayer in TiO2/Ag/TiO2 films enhanced the structural and optical properties of the films. (Received January 27, 2015; Revised February 6, 2015; Accepted February 9, 2015)