http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
칼코겐화물과 산화물 이종구조의 각도분해능 광전자분광 연구
장영준,Chang, Young Jun 한국진공학회 2018 진공 이야기 Vol.5 No.2
Chalcogenide and oxide heterostructures have been studied as a next-generation electronic materials, due to their interesting electronic properties, such as direct bandgap semiconductor, ferroelectricity, ferromagnetism, superconductivity, charge-density waves, and metal-insulator transition, and their modification near heterointerfaces, so called, electronic reconstruction. An angle-resolved photoemission spectroscopy (ARPES) is a powerful technique to unveil such novel electronic phases in detail, especially combined with high quality thin film preparation methods, such as, molecular beam epitaxy and pulsed laser deposition. In this article, the recent ARPES results in chalcogenide and oxide thin films will be introduced.
코경유 눈물주머니코안연결술 전 통상적인 이비인후과 의뢰의 임상적 효용성
장영준,김호창,서억수,Young Jun Jang,Ho Chang Kim,Eok Soo Suh 대한안과학회 2012 대한안과학회지 Vol.53 No.10
Purpose: To determine if routine otorhinolaryngologic referral prior to endonasal dacryocystorhinostomy (EN-DCR) is necessary. Methods: Two hundred thirty-seven eyes of 178 patients who were supposed to undergo EN-DCR were prospectively analyzed. Nasal endoscopy was performed by an ophthalmologist and the patients who had severe abnormality were referred to an otorhinolaryngologist. The patients were classified into 3 groups after a preoperative examination by an ophthalmologist and an otorhinolaryngologist; the number and success rate of each group were then investigated. Group A consisted of patients who had no nasal cavity abnormality, Group B consisted of patients with a nasal cavity abnormality but who received no treatment, and Group C consisted of patients who had a nasal cavity abnormality and received otorhinolaryngologic treatment. Results: The number of subjects in each group was 156 in Group A (87.7%), 12 in Group B (6.7%), and 10 in Group C (5.6%). The number of patients who were referred to the otorhinolaryngologist was 22 (12.3%). There was no statistical significance of success rate between the groups. Conclusions: Routine nasal endoscopic examination should be performed by an ophthalmologist prior to EN-DCR. Only patients with severe abnormal findings should be referred to an otorhinolaryngologist as the results from the present study show the percentage of patients having significant nasal abnormalities was found to be low (12%) and the success rate of EN-DCR revealed no statistical significance between the groups. This could help patients by saving time and expense. J Korean Ophthalmol Soc 2012;53(10):1392-1396
정환수(Hwan-Su Jeong),최수진(Su-Jin Choi),정구섭(Gu-Seop Jung),장영준(Young-Jun Chang) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The analysis of double-exposed photographic plate can be carried out either by Young's fringe analysis or by a digital image processing technique in Particle Tracking Velocimetry. In this Study, we used digital image processing to two images in one frame for analyzing in-cylinder flow fields, and The result of PTV(Particle Tracking Velocimetry) was compared with it of PSV(Particle Streak Velocimetry). Additionally, This technique was verified by three different calibration methods. One is interpolation by invert distance, another is interpolation by area ratio, the third is interpolation by Taylor series 1st.<br/> In PTV, The error range of curvature is about 1.4∼5 %. The results among three interpolation methods were similar in whole flow fields. Finally, in the comparison of PTV and PSV, PTV can be applicable of the analysis and the flow visualization on in-cylinder flow fields.
Young Jun Chang,Hyuk Jin Kim,박지현,J. H. Park,강종윤,박용섭,장영준 한국물리학회 2019 Current Applied Physics Vol.19 No.2
We investigated the influence of excimer-laser annealing (ELA) on the electrical, chemical, and structural properties of indium–tin oxide (ITO) films prepared by a solution process. The ITO film was prepared by the solgel method and annealed by excimer-laser pulses with an energy density up to 240 mJ/cm2 . Hall measurements showed that the ELA substantially enhanced the electrical properties of the ITO films, including their resistivity, carrier density, and mobility, as increasing the laser energy density. In-depth x-ray photoelectron spectroscopy analysis of the chemical states in the film surface showed that the ELA reduced carbon species and promoted both an oxidation and crystallization. These changes were consistent with results of x-ray diffraction and transmission electron microscopy measurements, where expansions in the microcrystal growth were observed for higher laser energy density. We comprehensively understand that the chemical rearrangement and concomitant crystallization are the main factors for achieving the electrical properties during the ELA. These results suggest the potential of the ELA-treated sol-gel films for providing high-quality ITO films at low temperatures toward the flexible device applications.
위장관 ; 헬리코박터 파일로리에 감염된 위 상피세포에서 DNA 이중나선절단 관찰
장영준 ( Young Jun Chang ),변상원 ( Sang Won Byun ),김형근 ( Hyung Keun Kim ),조영석 ( Young Seok Cho ),김성수 ( Sung Soo Kim ),김진일 ( Jin Il Kim ),김재광 ( Jae Kwang Kim ),정은선 ( Eun Sun Jung ) 대한소화기학회 2012 대한소화기학회지 Vol.60 No.2
Background/Aims: DNA double strand breaks (DSB) is one of the critical types of DNA damage. If unrepaired, DSB is accumulated in the nucleus of cells, the cells become apoptotic or transform to tumor by way of genomic instability. Some of malignant cancers and its premalignant lesions were proven to have DSB in their nuclei. There was no report that Helicobacter pylori (H. pylori), the gastric carcinogen, induce DNA DSB in gastric epithelium in vivo. The aim of this study was to investigate whether H. pylori induce DSB in the gastric epithelial cells of chronic gastritis. Methods: Immunohistochemical stains were performed for the DSB markers, phospho-53BP1 and γH2AX, in the gastric epithelium derived from 44 peptic ulcer disease patients before and after H. pylori eradication. DNA fragmentation assay was performed in the cell line to investigate the DNA damage by H. pylori infection. Results: The mean expression score of γH2AX was significantly higher in the H. pylori infected gastric epithelium as compared to the H. pylori eradicated gastric epithelium (8.8±5.5 vs. 6.2±5.3 respectively; p=0.008). The expression score of phospho-53BP1 between before and after eradication of H. pylori was not statistically different, but tended to be higher in H. pylori infection. DNA fragmentation was developed significantly more in the cell lines after infection with H. pylori. Conclusions: DSB of DNA damage was typical feature of H. pylori infection in the gastric epithelium. (Korean J Gastroenterol 2012;60:79-85)
이영준(Young-Jun Lee),황민영(Min-Young Hwang),송주헌(Ju-Hun Song),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The objective of this study was to investigate the combustion characteristics of a sintering burner in the various design factors which were distance and angle of each injection hole. To analyze the characteristics, the numerical study was conducted y 3 cases of differential hole distance and 4 types of hole angle which were 40, 45°, 50°, 55° at each case. To validate the numerical study, an experimental study was performed in a unit of the sintering burner at same conditions of the iron ore sintering process. Throughout the results, some difference was existed in the combustion characteristics about the design factors.
다이아프램식 수소압축기의 캐비티 내 압력특성 변화에 관한 실험적 연구
신영일(Shin, Young-Il),박현우(Park, Hyun-Woo),이영준(Lee, Young-Jun),송주헌(Song, Ju-Hun),장영준(Chang, Young-June),전충환(Jeon, Chung-Hwan) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Diaphragm compressors are used for a hydrogen compression because it can achieve high gas pressure with high purity. But diaphragm's lifetime may depend on the shape of the cavity and deflection from fluctuation the pressure change, which is necessary to monitored. In this study, the gas and hydraulic oil pressure in the cavity were measured as piston speed varies for diaphragm compressor. The results show pressure change quantities were reduced and maximum pressure points are delayed as the piston moves faster. And the hydraulic pressure were elevated as gas pressure elevated. And the compression period was more faster than expansion period.
코경유 눈물주머니코안연결술 전 통상적인 이비인후과 의뢰의 임상적 효용성
장영준 ( Young Jun Jang ),김호창 ( Ho Chang Kim ),서억수 ( Eok Soo Suh ) 한국안전학회(구 한국산업안전학회) 2003 International Journal of Safety Vol.2 No.1
목적: EN-DCR (endonasal dacryocystorhinostomy) 환자의 통상적인 술 전 이비인후과 의뢰가 가지는 효용성에 대해 알아보았다. 대상과 방법: EN-DCR 환자 178명 237안을 대상으로 전향적 연구를 하였다. 안과의사가 코 내시경으로 코 안 이상유무를 먼저 확인하고 심한 이상이 발견된 환자는 이비인후과에 의뢰하였다. 코 내시경 검사상 이상이 없는 환자를 A군, 코 안 이상으로 이비인후과 진료를 보았으나 수술에 큰 문제가 없다고 판단되어 EN-DCR만 시행한 환자를 B군, 이비인후과 의뢰 후 EN-DCR과 함께 부가적인 이비인후과 치료를 시행한 환자를 C군으로 분류하여 각 군의 빈도 및 수술성공률을 분석하였다.결과: 전체 178명의 환자 중 A군 156명, B군 12명, C군 10명이었고 심한 코 안의 이상으로 이비인후과 진료가 필요했던 환자는 총22명(12.3%)이었으며 군간 수술성공률은 통계적으로 차이가 없었다.결론: EN-DCR 전 통상적인 이비인후과 의뢰의 필요성은 그리 크지 않을 것으로 생각하며 술 전 안과의사의 검사 후 필요한 환자의 경우에만 이비인후과 진료를 의뢰한다면 환자의 시간적, 경제적 부담을 줄일 수 있을 것이다. Purpose: To determine if routine otorhinolaryngologic referral prior to endonasal dacryocystorhinostomy (EN-DCR) is necessary. Methods: Two hundred thirty-seven eyes of 178 patients who were supposed to undergo EN-DCR were prospectively analyzed. Nasal endoscopy was performed by an ophthalmologist and the patients who had severe abnormality were referred to an otorhinolaryngologist. The patients were classified into 3 groups after a preoperative examination by an ophthalmologist and an otorhinolaryngologist; the number and success rate of each group were then investigated. Group A consisted of patients who had no nasal cavity abnormality, Group B consisted of patients with a nasal cavity abnormality but who received no treatment, and Group C consisted of patients who had a nasal cavity abnormality and received otorhinolaryngologic treatment. Results: The number of subjects in each group was 156 in Group A (87.7%), 12 in Group B (6.7%), and 10 in Group C (5.6%). The number of patients who were referred to the otorhinolaryngologist was 22 (12.3%). There was no statistical significance of success rate between the groups. Conclusions: Routine nasal endoscopic examination should be performed by an ophthalmologist prior to EN-DCR. Only patients with severe abnormal findings should be referred to an otorhinolaryngologist as the results from the present study show the percentage of patients having significant nasal abnormalities was found to be low (12%) and the success rate of EN-DCR revealed no statistical significance between the groups. This could help patients by saving time and expense. J Korean Ophthalmol Soc 2012;53(10):1392-1396