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Kwack, Ho-Sang,Kim, Byoung-O,Cho, Yong-Hoon,Song, Jin-Dong,Choi, Won-Jun,Lee, Jung-Il IOP Pub 2007 Nanotechnology Vol.18 No.31
<P>We have investigated optical and structural properties of various In<SUB>0.5</SUB>Ga<SUB>0.5</SUB>As quantum dot (QD) structures as a function of stacking number, grown by atomic layer molecular beam epitaxy (ALE). We found that the excitation power and temperature dependence of well-separated two emissions from 10 stacked InGaAs QD samples are different from those of other QDs with the stacking numbers of 1, 3 and 5. Although the GaAs spacer thickness is ∼35 nm at which the strain field penetration can be ignored for Stranski–Krastanov mode-grown InAs QDs, our ALE-grown QDs are influenced by the strain field penetration due to the larger size of ALE QDs. From transmission electron microscopic images, we observed that the ten stacked QD sample has a complex QD size distribution predominantly due to vertical size variation with stacking and that upper stacked (5–10) QD layers are vertically realigned due to the merged strain field penetration between laterally coupled QDs. </P>
Ho-Sang Kwack,조용훈,Sung Bum Bae,DaeKonOh,Kyu Seok Lee,Chang Soo Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
AlxGa1−xN/GaN films were grown on sapphire substrate by using metalorganic chemical vapor deposition, and their structural, electrical, and optical properties were systematically investigated by using atomic force microscopy, high-resolution X-ray diffraction (HRXRD), Hall measurements, and photoluminescence (PL). The strain states and the mosaic properties of the AlGaN and GaN layers were studied by using the (10·5) asymmetric reciprocal space maps (RSMs). From the RSMs, we confirmed that the crystal lattice of the Al0.13Ga0.89N film was fully strained and that the crystal quality was good. From the PL and the HRXRD data, we observed that a certain range of Si doping could cause a small variation of Al incorporation during the growth of the AlGaN film, resulting in a variation in the Al content and the crystal quality of the AlGaN layer. From the results, we conclude that moderate Si-doping improves the optical and the structural properties of Al0.11Ga0.89N films.
Numerical analysis for supercavitating flows around axisymmetric cavitators
Kwack, Young Kyun,Ko, Sung Ho The Society of Naval Architects of Korea 2013 International Journal of Naval Architecture and Oc Vol.5 No.3
Diffuse interface model for numerical analysis was used to compute supercavitating flows around various cavitators. The ambient pressures of 2 atm permitted cavitation studies in a range of cavitation number, ${\sigma}=0.1$ to 1.0 on selected conical and disk-headed cavitors. The computed results were compared with relation by Reichardt. Drag coefficient obtained from pressure forces acting on the cavitator also compared well with those obtained from analytical relations.
Sang Ik Han(韓尙益),Hyun Tae Kim(金賢泰),Yil Chan Kwon(權一瓚),Chang Kie Park(朴昶璂),Yong Ho Kwack(郭龍鎬),Ill Kyung Chung(鄭鎰炅) 한국육종학회 1997 한국육종학회지 Vol.29 No.1
This study was conducted to determine the pattern of self-incompatibility through self-and cross-pollination in two varieties of herbaceous peony (Paeonia lactiflora Pallas). After self-pollination with the pollens of same variety, pollen tubes have germinated and grown into style tissue. However, the pollen tubes have arrested the growth in the mid of growing stage. This pattern was a different from that of sporophytic self-incompatibility. In the case of sporophytic self-incompatibility, self-pollinated pollens are not germinated on the style in normal, but if the pollens do, they do not penetrate into style tissue. From these phenomena, the pattern of self-incompatibility in herbaceous peony is assumed gametophytic self-incompatibility. For more precise research, protein analysis using SDS-PAGE and RNase activity stain gel electrophoresis was conducted. In SDS-PAGE analysis, two major proteins (21.5 and 28-kDa) was detected, and ribonuclease activity was tested in activity stain gel. Ribonucleatic activity is a unique characteristic of stylar proteins of gametophytic self-incompatibility plants reported previously. From these results, we concluded that P. lactiflora has a gametophytic self-incompatibility.
안성구(Sung Ku Ahn),원진형(Jin Hyong Won),곽호(Ho Kwack),이승헌(Seung Hun Lee),이성낙(Sung Nack Lee) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.2
A 70 year-old male visited with 1 month history of dark brown, hard, non-movable subcutaneous nodule on the anterior chest. Histopathologic findings were compatible with the metastatic transitional cell carcinoma of the urinary bladder. (Kor J Dermatol 29(2):271--274)
초공동 수중비행체의 공동영역 내부에서 분사된 배기가스가 수중비행체의 항력에 미치는 영향에 대한 수치해석적 연구
유상원(Sang Won Yoo),이우근(Woo Keun Lee),김태순(Tea Soon Kim),곽영균(Young Kyun Kwack),고성호(Sung Ho Ko) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.12
초공동 수중비행체는 수중에서 시속 300 km 이상의 속력을 가진다. 초공동 수중비행체는 로켓추진을 동력으로 사용하기 때문에 초공동 수중비행체의 수치해석은 물과 수증기, 배기가스로 이루어진 다상 유동을 다루게 된다. 배기가스가 수중비행체에 미치는 영향은 초공동 수중 비행체 성능연구에 중요한 부분이다. 본 연구에서는 초공동 수중비행체 주변의 유동장에 대한 수치해석을 통하여 배기가스가 비행체의 항력에 어떠한 영향을 미치는지 알아보았다. 배기가스가 없는 경우, 수중비행체를 둘러싼 초공동으로 물이 유입되는 재유입현상에 의해 수중비행체 항력의 변화가 발생한다. 추진체가 있는 경우 배출되는 가스는 재유입현상에 의한 영향을 감소시킨다. 또한 배기가스는 마하디스크를 생성하며 그 영향을 받아 항력 변화가 발생한다. A supercavitating vehicle has a speed of more than 300 km/h in water. A numerical analysis of the flow around a supercavitating vehicle must deal with a multiphase flow consisting of the water, vapor and exhaust gas because the vehicle is powered by roket propulsion. The effect of the exhaust gas on the vehicle is an important part in the study of the performance of the supercavitating vehicle. In the present study, the effect of the exhaust gas on the drag of vehicle was investigated by conducting numerical analysis. When there is no exhaust gas, drag of vehicle is affected by re-entrant. In the case with rocket propulsion, the exhaust gas reduces the influence of re-entrant. The exhaust gas also creates Mach disk and it changes drag profile.
고성호(Sung Ho Ko),김연태(Yeon Tae Kim),곽영균(Young Kyun Kwack),강민구(Min Koo Kang),한승열(Seung Yeul Han) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
A numerical study was conducted to predict the performance curve of a canned motor pump for SMART(System Integrated Modular Advanced ReacTor). The study used a computational domain which included not only the pump but also a suction pipe and a volute casing with a discharging pipe in order to simulate an experimental setup. The ANSYS CFX program was utilized to obtain flow characteristics inside the pump as well as the overall pressure rise across the pump operating on- and off-design points. Computed results showed that the performance of the pump at off-design points was much lower than expected. Special attention was made to find the cause of the low performance of the pump operating at low flow rate.