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Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect
Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.
장애학생 관련 변인에 따른 비장애 학생의 통합태도 연구
오원석 ( Won Seok Oh ),남경숙 ( Kyung Sook Nam ),허명진 ( Myung Jin Huh ) 한국특수교육문제연구소 2006 특수교육저널 : 이론과 실천 Vol.7 No.3
장애학생 관련 변인에 따른 비장애 학생의 통합교육에 대한 태도 및 장애학생에 대한 친근감을 알아보기 위하여 본 연구를 수행하였으며, 연구 대상은 대구광역시 초등학교 5개교15학급 477명을 선정하였다. 연구 결과 장애학생의 통합에 대한 비장애 학생의 태도에 영향을 미치는 변인은 장애유형, 장애학생 성별, 장애학생의 청결상태이며, 영향을 미치지 않는 변인으로는 장애학생 부모의 관심도, 장애아 가정의 경제적 수준 그리고 장애학생의 학습 능력인 것으로 나타났다. The purpose of this study is to determine the attitudes for integration education and the intimacy with disabled students of Nondisabled students influenced by disabled students. For such purpose, 477 students of 15 classes from 5 elementary schools located in Daegu Metropolitan City were selected as the object of this study. Integrated Attitudes was measured through an investigation equipment by Oh Won-Seok and Seo-Yeong Ran which adapted and modified a testing document called Inclusion of Students who are Deaf or Hard of Hearing Inventory (ISDHH) invented by Hsin-Ling Hung(2005). The result indicated that the factors which influence the Attitudes of nondisabled students regarding integration with disabled students are the type of injury, the gender and the cleanness of the disabled student. The factors which do not influence the above are interests of the disabled student``s parents, economic level of the family and the learning ability of the disabled student.
Cystic Medullary Thyroid Carcinoma: A Case of Undergoing Endoscopic Thyroid Lobectomy
Dong Hae Chung,Jae Yeon Seok,Yoo Seung Chung1,Eun Mee Oh1,Jung Won Ryu1,Young Don Lee1 대한갑상선-내분비외과학회 2015 The Koreran journal of Endocrine Surgery Vol.15 No.1
On ultrasonography, medullary thyroid carcinoma (MTC) shows hypoechogenicity, an irregular margin, a predominantly solid composition, and microcalcifications, similar to those observed in papillary thyroid carcinoma (PTC). MTC presenting as a cystic lesion is rare, and endoscopic thyroidectomy can be performed for benign thyroid masses and early stage PTC, however it is inappropriate for MTC regardless of cystic change. The authors report a case of cystic MTC found after endoscopic thyroid lobectomy and provide a review of the literature on this topic.
Oh, Sung-Kwen,Shin, Hong-Sik,Jeong, Kwang-Seok,Li, Meng,Lee, Horyeong,Han, Kyumin,Lee, Yongwoo,Lee, Ga-Won,Lee, Hi-Deok The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.1
In this paper, $Al_2O_3$ film deposited by thermal atomic layer deposition (ALD) with diluted $NH_4OH$ instead of $H_2O$ was suggested for passivation layer and anti-reflection (AR) coating of the p-type crystalline Si (c-Si) solar cell application. It was confirmed that the deposition rate and refractive index of $Al_2O_3$ film was proportional to the $NH_4OH$ concentration. $Al_2O_3$ film deposited with 5 % $NH_4OH$ has the greatest negative fixed oxide charge density ($Q_f$), which can be explained by aluminum vacancies ($V_{Al}$) or oxygen interstitials ($O_i$) under O-rich condition. $Al_2O_3$ film deposited with $NH_4OH$ 5 % condition also shows lower interface trap density ($D_{it}$) distribution than those of other conditions. At $NH_4OH$ 5 % condition, moreover, $Al_2O_3$ film shows the highest excess carrier lifetime (${\tau}_{PCD}$) and the lowest surface recombination velocity ($S_{eff}$), which are linked with its passivation properties. The proposed $Al_2O_3$ film deposited with diluted $NH_4OH$ is very promising for passivation layer and AR coating of the p-type c-Si solar cell.
A Novel Atomic Layer Deposited Al₂O₃ Film with Diluted NH₄OH for High-Efficient c-Si Solar Cell
Sung-Kwen Oh,Hong-Sik Shin,Kwang-Seok Jeong,Meng Li,Horyeong Lee,Kyumin Han,Yongwoo Lee,Ga-Won Lee,Hi-Deok Lee 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.1
In this paper, Al2O3 film deposited by thermal atomic layer deposition (ALD) with diluted NH4OH instead of H2O was suggested for passivation layer and anti-reflection (AR) coating of the p-type crystalline Si (c-Si) solar cell application. It was confirmed that the deposition rate and refractive index of Al2O3 film was proportional to the NH4OH concentration. Al2O3 film deposited with 5 % NH4OH has the greatest negative fixed oxide charge density (Qf), which can be explained by aluminum vacancies (VAl) or oxygen interstitials (Oi) under O-rich condition. Al2O3 film deposited with NH4OH 5 % condition also shows lower interface trap density (Dit) distribution than those of other conditions. At NH4OH 5 % condition, moreover, Al2O3 film shows the highest excess carrier lifetime (τPCD) and the lowest surface recombination velocity (Seff), which are linked with its passivation properties. The proposed Al2O3 film deposited with diluted NH4OH is very promising for passivation layer and AR coating of the p-type c-Si solar cell.
Comparison of the Results of Balloon Kyphoplasty Performed at Different Times after Injury
Oh, Gun-Soek,Kim, Hyeun-Sung,Ju, Chang-Il,Kim, Seok-Won,Lee, Seung-Myung,Shin, Ho The Korean Neurosurgical Society 2010 Journal of Korean neurosurgical society Vol.47 No.3
Objective : Balloon kyphoplasty is a minimally invasive procedure that is mainly performed for refractory pain due to osteoporotic compression fractures. The purpose of this study was to evaluate the results of balloon kyphoplasty performed at different times after an injury. Methods : In this retrospective study, the records of 99 patients who underwent one level of balloon kyphoplasty between January 2005 and December 2007 were reviewed. The patients were divided into three groups : 21 patients treated within 3 weeks of an injury (the acute group), 49 treated within 3 weeks to 2 months of an injury (the subacute group), and 29 patients treated at more than 2 months after an injury (the chronic group). Clinical outcomes were assessed using a visual analogue scale (VAS). In addition, modified MacNab's grading criteria was used to assess the subjective patient outcome. The radiology findings, including vertebral height restoration and procedure related complications, were analyzed based on the different time intervals after the injury. Results : Patients in all three groups achieved marked pain relief in terms of the VAS within 7 days of the procedure. Good or excellent results were achieved by most patients in all three groups. However, the height restoration, the main advantage to performing a balloon kyphoplasty, was not achieved in the chronic group. Moreover, evidence of complications including cement leakage was observed significantly less frequently in the subacute group compared to the other two groups. Conclusion : Although balloon kyphoplasty is an effective treatment for osteoporotic compression fractures, with regard to pain relief, the subacute stage appears to be optimal for treating patients with a balloon kyphoplasty in terms of achieving the best outcomes with minimal complications.
Oh, Sung-Kwen,Shin, Hong-Sik,Jeong, Kwang-Seok,Li, Meng,Lee, Horyeong,Han, Kyumin,Lee, Yongwoo,Lee, Ga-Won,Lee, Hi-Deok The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.6
This paper presents a study of the process temperature dependence of $Al_2O_3$ film grown by thermal atomic layer deposition (ALD) as a passivation layer in the crystalline Si (c-Si) solar cells. The deposition rate of $Al_2O_3$ film maintained almost the same until $250^{\circ}C$, but decreased from $300^{\circ}C$. $Al_2O_3$ film deposited at $250^{\circ}C$ was found to have the highest negative fixed oxide charge density ($Q_f$) due to its O-rich condition and low hydroxyl group (-OH) density. After post-metallization annealing (PMA), $Al_2O_3$ film deposited at $250^{\circ}C$ had the lowest slow and fast interface trap density. Actually, $Al_2O_3$ film deposited at $250^{\circ}C$ showed the best passivation effects, that is, the highest excess carrier lifetime (${\tau}_{PCD}$) and lowest surface recombination velocity ($S_{eff}$) than other conditions. Therefore, $Al_2O_3$ film deposited at $250^{\circ}C$ exhibited excellent chemical and field-effect passivation properties for p-type c-Si solar cells.
Seok Won Chung,Kyung-Soo Oh,Sung Jin Kang,Jong Pil Yoon,Joon Yub Kim 대한견주관절의학회 2018 대한견주관절학회지 Vol.21 No.1
Background: This study is performed to evaluate anchor-related outcomes and complications after arthroscopic rotator cuff repair using 30% b-tricalcium phosphate (b-TCP) with 70% poly lactic-co-glycolic acid (PLGA) biocomposite suture anchors. Methods: A total of 78 patients (mean age, 61.3 ± 6.9 years) who underwent arthroscopic medium-to-large full-thickness rotator cuff tear repair were enrolled. The technique employed 30% b-TCP with 70% PLGA biocomposite suture anchors at the medial row (38 patients, Healix BRTM anchor [Healix group]; 40 patients, Fixone anchor B [Fixone group]). The radiologic outcomes (including perianchor cyst formation or bone substitution) and anatomical outcomes of the healing failure rate were evaluated using magnetic resonance imaging at least 6 months after surgery, the pain visual analogue scale at 3, 6 months, and final follow-up visit, and American Shoulder and Elbow Surgeons scores at least 1 year postoperatively. Anchor-related complications were also evaluated. Results: The perianchor cyst formation incidence was similar for both groups (60.5%, Healix group; 60.0%, Fixone group; p=0.967), although severe perianchor cyst incidence was slightly lower in the Fixone group (15.0%) than in the Healix group (21.1%). There was no occurrence of anchor absorption and bone substitution. No differences were observed in the healing failure rate (13.2%, Healix group; 15.0%, Fixone group; p=0.815) and functional outcome between groups (all p>0.05). Anchor breakage occurred in 5 patients (2 Healix anchors and 3 Fixone anchors); however, there were no major anchor-related complications in either group. Conclusions: No differences were observed in the clinical outcomes of the Healix and Fixone groups, neither were there any accompanying major anchor-related complications.