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S.-Y. Kwon,윤의준,H. Na,H. J. Kim,정현식,H.-C. Seo,J.-W. Yoon,Y. Shin,Y. Sun,조용훈,Y.-W. Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
In-rich InGaN/GaN nanostructures such as quantum wells (QWs) and quantum dots (QDs) were successfully grown by metal-organic chemical vapor deposition and their optical properties were investigated. Introduction of a relatively high growth temperature made it possible to grow In-rich InGaN/GaN QWs and growth interruption (GI) was eectively used to control their structural and optical properties. From In-rich InGaN/GaN QW structures grown without GI, enhanced thermal stability appeared in optical properties and thickness °uctuation in In-rich InGaN QWs could give intrinsic QD-like carrier localization centers. To enhance thermal characteristics, arti¯cial formation of In-rich InGaN/GaN QDs was done at a relatively lower growth temperature than that of QWs. From In-rich InGaN/GaN QDs, we could obtain high e±ciency ultraviolet emission at room temperature.
Effect of growth interruption on InN / GaN single quantum well structures
S.-Y. Kwon,H. J. Kim,H. Na,H.-C. Seo,H. J. Kim,Y. Shin,Y.-W. Kim,S. Yoon,H.-J. Oh,C. Sone,Y. Park,Y. P. Sun,Y.-H. Cho,H. M. Cheong,E. Yoon 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
We successfully grew InN/GaN single quantum well structures by metal-organic chemical vapor deposition and confirmed their formation by optical and structural measurements. We speculate that relatively high growth temperature (730℃) of InN layer enhanced the formation of 2-dimensional quantum well structures, presumably due to high adatom mobility. As the growth interruption time increased, the PL emission efficiency from InN layer improved with peak position blue-shifted and the dislocation density decreased by one order of magnitude. The high resolution cross-sectional TEM images clearly showed that the InN layer thickness reduced from 2.5 ㎚ (without GI) to about 1 ㎚ (with 10 sec GI) and the InN/GaN interface became very flat with 10 sec GI. We suggest that decomposition and mass transport processes on InN during GI is responsible for these phenomena.
Effect of growth interruption on InN/GaN single quantum well structures
Kwon, S.Y.,Kim, H.J.,Na, H.,Seo, H.C.,Kim, H.J.,Shin, Y.,Kim, Y.W.,Yoon, S.,Oh, H.J.,Sone, C.,Park, Y.,Sun, Y.P.,Cho, Y.H,Cheong, H.M.,Yoon, E. The Korean Vacuum Society 2003 Applied Science and Convergence Technology Vol.12 No.1
We successfully grew InN/GaN single quantum well structures by metal-organic chemical vapor deposition and confirmed their formation by optical and structural measurements. We speculate that relatively high growth temperature ($730^{\circ}C$) of InN layer enhanced the formation of 2-dimensional quantum well structures, presumably due to high adatom mobility. As the growth interruption time increased, the PL emission efficiency from InN layer improved with peak position blue-shifted and the dislocation density decreased by one order of magnitude. The high resolution cross-sectional TEM images clearly showed that the InN layer thickness reduced from 2.5 nm (without GI) to about I urn (with 10 sec GI) and the InN/GaN interface became very flat with 10 sec GI. We suggest that decomposition and mass transport processes on InN during GI is responsible for these phenomena.
선종호(J. H. Sun),김광화(K. H. Kim),홍정기(C. K. Hong),최영준(Y. C. Choi),신양섭(Y. S. Shin),이용희(Y. H. Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.5
전력기기가 고급화, 복잡화, 고기능성을 요구하면서 고신뢰도 설계를 위한 신뢰성 기술이나 고장없이 일정기간동안 사용하기 위한 품질관리활동의 중요성이 크게 대두되고 있다. 이러한 요구를 충족시키기 위해서는 시스템이나 이를 구성하고 있는 부품의 성능에 대한 신뢰도를 분석해서 설계 및 보수기술에 적용해야 한다. 본 연구에서는 신뢰도 평가를 기반으로 하는 변전기기의 유지보수를 위하여 이에필요한 점검주기, 수명산출, 고장모드와 영향평가 등과 같은 신뢰도 평가기술에 관하여 논하였다.
High-power lithium polysulfide-carbon battery
Shin, H.d.,Agostini, M.,Belharouak, I.,Hassoun, J.,Sun, Y.K. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-
<P>We report a lithium battery using activated carbon on gas diffusion layer (GDL) electrode as host for lithium polysulfide conversion reaction. The cell operates within 2.8 and 2.1 V and delivers a capacity ranging from 400 mAh g(-1) at 1C to 150 mAh g(-1) at 40C over 100 cycles. These characteristics allow the achievement of high energy and power density, i.e. practically estimated to reach the maximum values of the order of 300 Wh kg(-1) and 12 kW kg(-1), respectively. These values, exceeding those delivered by the conventional lithium ion batteries, make our battery of sure interest for practical applications. (C) 2015 Elsevier Ltd. All rights reserved.</P>
Shear strength model for reinforced concrete rectangular hollow columns
Shin, M.,Choi, Y.Y.,Sun, C.H.,Kim, I.H. IPC Science and Technology Press ; Elsevier Scienc 2013 Engineering structures Vol.56 No.-
The primary purpose of this paper is to propose an assessment model for concrete contribution to the shear strength of reinforced concrete (RC) rectangular hollow columns subjected to lateral loading. The model was developed based on the test results of this study, as well as other hollow column tests available in literature. A total of thirteen ¼-scale RC rectangular hollow columns, with no transverse reinforcement, were tested under lateral loading in this study. The test variables included column length-to-depth aspect ratio, longitudinal steel ratio, hollow section ratio, web-to-gross section area ratio, and loading pattern. Also, a database of almost all RC hollow column tests available worldwide was assembled and used in quantifying the effect of increasing ductility on the column shear strength. Several popular shear models proposed earlier, all of which were mainly based on tests for columns with solid sections, were reviewed and compared with the developed model.
Park, Sun-Hee,Do, Jun-Young,Kim, Yeong Hoon,Lee, Ho Yung,Kim, Beom Seok,Shin, Sug-Kyun,Kim, Hyun Chul,Chang, Yoon-Kyung,Yang, Jong-Oh,Chung, Hyun-Chul,Kim, Chan-Duck,Lee, Won Kee,Kim, Jong-Yeon,Kim, Y Springer International ; Oxford University Press 2012 Nephrology, dialysis, transplantation Vol.27 No.3
<P>The local peritoneal effects of low-glucose degradation product (GDP)-containing peritoneal dialysis fluid (PDF) have been extensively described. However, the systemic effects of prolonged prescription of these solutions are unknown. This study aimed to evaluate the effects of neutral pH and low-GDP PDF on systemic inflammation and endothelial dysfunction markers in peritoneal dialysis (PD) patients.</P>