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스퍼터링법으로 증착된 산화아연 박막의 구조적 성질에 대한 산화마그네슘 완충층의 효과 연구
임영수,Lim, Young-Soo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
The effect of MgO buffer layer on the structural properties of sputter-grown ZnO thin film was investigated. Sapphire (0001) and Si (100) substrate were used for the growth and MgO buffer layer was inserted between ZnO thin film and the substrate. X-ray diffraction pattern indicated that enhanced crystallinity in the ZnO thin film grown was achieved by inserting very thin MgO buffer layer, regardless of the substrate type. The strain in the ZnO thin film could also be controlled by the insertion of the MgO buffer layer, and tendency of the strain was strongly dependent on the substrate type.
열간 압축 방법으로 제작된 Bi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>3</sub> 열전소재 복합체에서 Sb 함량이 전하수송과 출력인자에 미치는 효과
임영수 ( Young Soo Lim ),이순일 ( Soonil Lee ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.9
Abstract: We report the effects of Sb content on the charge transport and power factor of Bi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>3</sub>(1.56 ≤ □ ≤ 1.74) compounds prepared by hot pressing. From the temperature-dependence of the electrical conductivity, it was found that the charge transport in the compounds was predominantly governed by acoustic phonon scattering, and additionally affected by ionized impurity scattering. Hole concentration increased with increasing Sb content due to the generation of antisite defects, and its process-dependence is discussed in comparison with our previous work. The room-temperature mobility of the compound gradually decreased with increasing Sb content due to the intensification of ionized impurity scattering by the antisite defects, however, the effect of grain boundary scattering on the mobility could not be observed. The Seebeck coefficient decreased with the increase in Sb content, and this effect was interpreted in terms of the carrier concentration and the density-of-state (DOS) effective mass. The DOS effective mass was estimated by Pisaernko relation, and it increased from 0.75 (□ = 1.56) to 0.97 (□ = 1.74) with increasing Sb content due to the non-parabolicity in the valence band of Bi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>3</sub>. Based on these results, the effects of Sb content on the power factor were discussed, and the highest power factor of 37.2 × 10<sup>-4</sup> Wm<sup>-1</sup>K<sup>-2</sup> was obtained in the Bi<sub>0.3</sub>Sb<sub>1.7</sub>Te<sub>3</sub> compound at room temperature. (Received February 16, 2017; Accepted April 16, 2017)
조재권,임영수,홍도웅,김종규,Cho, Jae-Kweon,Lim, Young-Soo,Hong, Do-Ung,Kim, Jong-Kyu 한국해양환경•에너지학회 2012 한국해양환경공학회지 Vol.15 No.1
전남 거문도 바다숲 조성용 시설물의 효율적인 배치를 위하여 수치실험을 통하여 바다숲 조성해역의 조석류에 의한 해수유동을 분석하였으며, 분석된 해수유동을 바탕으로 하여 바다숲 조성해역 인근에 위치한 자연적인 해중림에서 발생한 해조류 포자의 거동을 파악하기 위하여 입자추적실험 및 부유사 농도변화 실험을 수행하였다. 수치실험에 사용된 수치모형은 EFDC(Environmental Fluid Dynamics Code)를 사용하였으며, 연직방향으로 총 10개층으로 나누어 실험을 수행하였다. 실험결과, 바다숲 조성해역의 해수유동패턴은 대상해역 바깥쪽의 주류에 비해 방파제의 역할을 하는 밖노루섬으로 인해 흐름이 약하고, 잔차류를 분석한 결과 주로 북서방향의 흐름이 형성되나 크기는 미약하였다. 인근에 위치한 자연 해중림은 크게 2곳으로, 이들 해역에 투하한 해조류 포자는 투하한 후 30시간이 경과하면 대부분 해저면에 안착하였다. 포자는 대상 해역의 미약한 흐름에 의해 발생지역에 대부분 안착하였다. 바람조건을 적용한 경우에는 적용하지 않은 경우에 비해 포자가 남동쪽으로 좀 더 이동하여 안착하나 그 차이는 미미하였다. 부유사 실험결과 부유사 농도는 조시별로 흐름에 따라 농도가 변화하며 표층보다 저층에서 높게 나타났다. 이러한 결과를 토대로 바다숲 조성용 시설물을 효율적으로 배치할 수 있을 것으로 사료된다. To arrange effectively artificial reefs for marine afforestation, tidal currents were analyzed by numerical experiments, and particle tracking based upon tidal currents were carried out to clarify the path of algae spore. The experiments were carried out by EFDC (Environmental Fluid Dynamics Code), and water column was vertically divided 10 layers. Tidal current patterns showed to be affected by main current at outside of study area, and circle currents of two were observed from analysis of residual currents. Particle tracking were experimented for 15 days at 2 installation places in which artificial reefs for marine afforestation would be deployed. According to the results of particle tracking experiment, particle movement at St.1 showed belt type along coastal line, and St.2 showed ellipse type at 300~500 m distant from coastal line. It suggest that artificial reefs for marine afforestation should be installed belt zone at station of St.1 and ellipse zone at St.2. Modelling algae transport was also tested to account for local dispersion of algae spore due to the suspended materials.
신경병증성 통증과정의 NMDA 수용체 활성과 칼슘통로 α2δ1 Subunit의 영향
유수봉,임영수,김두식,Yu, Soo Bong,Lim, Young Soo,Kim, Doo Sik 대한통증학회 2009 The Korean Journal of Pain Vol.22 No.3
Background: Several studies have indicated that a nerve injury enhances the expression of the voltage-gated calcium channel ${\alpha}2{\delta}1$ subunit (Cav ${\alpha}2{\delta}1$) in sensory neurons and the dorsal spinal cord. This study examined whether NMDA receptor activation is essential for Cav ${\alpha}2{\delta}1$-mediated tactile allodynia in Cav ${\alpha}2{\delta}1$ overexpressing transgenic mice and L5/6 spinal nerve ligated rats (SNL). These two models show similar Cav ${\alpha}2{\delta}1$ upregulation and behavioral hypersensitivity, without and with the presence of other injury factors, respectively. Methods: The transgenic (TG) mice were generated as described elsewhere (Feng et al., 2000). The left L5/6 spinal nerves in the Harlan Sprague Dawley rats were ligated tightly (SNL) to induce neuropathic pain, as described by Kim et al. (1992). Memantine 2 mg/kg (10 ul) was injected directly into the L5/6 spinal region followed by $10{\mu}l$ saline. Tactile allodynia was tested for any mechanical hypersensitivity. Results: The tactile allodynia in the SNL rats could be reversed by an intrathecal injection of memantine 2 mg/kg at 1.5 hours. The tactile allodynia in the Cav ${\alpha}2{\delta}1$ over-expressing TG mice could be reversed by an intrathecal injection of memantine 2 mg/kg at 1.5, 2.0 and 2.5 hours. Conclusions: The behavioral hypersensitivity was similar in the TG mice and nerve injury pain model, supporting the hypothesis that elevated Cav ${\alpha}2{\delta}1$ mediates similar pathways that underlie the pain states in both models. The selective activation of spinal NMDA receptors plays a key role in mediating the pain states in both the nerve-injury rats and TG mice.
WC/Co 초경합금 스크랩 산화물로부터 환원/침탄공정에 의한 WC/Co 복합분말 제조
이길근,임영수,Lee, Gil-Geun,Lim, Young Soo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3
This study focuses on the fabrication of a WC/Co composite powder from the oxide of WC/Co hardmetal scrap using solid carbon in a hydrogen gas atmosphere for the recycling of WC/Co hardmetal. Mixed powders are manufactured by mechanically milling the oxide powder of WC-13 wt% Co hardmetal scrap and carbon black with varying powder/ball weight ratios. The oxide powder of WC-13 wt% Co hardmetal scrap consists of $WO_3$ and $CoWO_4$. The mixed powder mechanically milled at a lower powder/ball weight ratio (high mechanical milling energy) has a more rapid carbothermal reduction reaction in the formation of WC and Co phases compared with that mechanically milled at a higher powder/ball weight ratio (lower mechanical milling energy). The WC/Co composite powder is fabricated at $900^{\circ}C$ for 6 h from the oxide of WC/Co hardmetal scrap using solid carbon in a hydrogen gas atmosphere. The fabricated WC/Co composite powder has a particle size of approximately $0.25-0.5{\mu}m$.