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Comparison of Surface Passivation Layers on InGaN/GaN MQW LEDs
Hyuck Soo Yang,Sang Youn Han,M. Hlad,B. P. Gila,K. H. Baik,S. J. Pearton,Soohwan Jang,B. S. Kang,F. Ren 대한전자공학회 2005 Journal of semiconductor technology and science Vol.5 No.2
The effect of different surface passivation films on blue or green (465-505 nm) InGaN/GaN multiquantum well light-emitting diodes (LEDs) die were examined. SiO₂or SiNx deposited by plasma enhanced chemical vapor deposition, or Sc₂O₃or MgO deposited by rf plasma enhanced molecular beam epitaxy all show excellent passivation qualities. The forward currentvoltage (I-V) characteristics were all independent of the passivation film used, even though the MBE-deposited films have lower interface state densities (3-5×10¹¹ eV-¹ cm-²) compared to the PECVD films (~10¹² eV-1 cm-²). The reverse I-V characteristics showed more variation, but there was no systematic difference for any of the passivation films. The results suggest that simple PECVD processes are effective for providing robust surface protection for InGaN/GaN LEDs.
Clinicopathologic risk factors for the local recurrence of phyllodes tumors of the breast.
Jang, Jae Hyuck,Choi, Min-Young,Lee, Se Kyung,Kim, Sangmin,Kim, Jiyoung,Lee, Jeonghui,Jung, Seung Pil,Choe, Jun-Ho,Kim, Jung-Han,Kim, Jee Soo,Cho, Eun Yoon,Lee, Jeong Eon,Nam, Seok Jin,Yang, Jung-Hyun Raven Press 2012 Annals of surgical oncology Vol.19 No.8
<P>Phyllodes tumors (PTs) are rare breast tumors that usually occur in middle-aged women. Here we discuss our recent experiences in the diagnosis, surgical management, and clinical follow-up of this disease.</P>
Han-Bit Kang,Jang-Young Choi,Han-Wook Cho,Jae-Hyuck Kim IEEE 2014 IEEE transactions on magnetics Vol.50 No.11
<P>This paper presents a comparative study of torque analysis for synchronous permanent magnet couplings (SPMCs) with parallel- and Halbach-magnetized magnets, using analytical field calculations. On the basis of the magnetic vector potential, we derived analytical solutions for the magnetic field produced by the interaction between the inner and outer PMs for the parallel- and Halbach-magnetized cases. Then, we calculated the magnetic torque using the derived solutions and Maxwell stress tensor. Our analytical results are verified using both 2-D and 3-D finite element analysis and experimental results. We found that SPMC with Halbach-magnetized magnets exhibit dominant pull-out torque than SPMC with parallel magnetized magnets.</P>
최한용 ( Han Yong Choi ),장재혁 ( Jae Hyuck Jang ),송창근 ( Chang Geun Song ),고영웅 ( Young Woong Ko ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1
본 연구에서는 증강 현실 환경에서 사용자와의 상호 작용을 효율적으로 수행할 수 있는 적외선 기반 제스처 인터페이스를 제안한다. 제안하는 방식은 적외선 마커를 이용한 간단한 제스처를 통하여 홈오 토메이션 시스템의 다양한 인터페이스 처리를 제공한다. 제안하는 시스템 프로토타입을 구현하였으며, 플랫폼을 다수의 사용자들을 대상으로 시연한 결과 직관적이고 쉬운 인터페이스임을 확인할 수 있었다.
Comparison of Surface Passivation Layers on InGaN/GaN MQW LEDs
Yang, Hyuck-Soo,Han, Sang-Youn,Hlad, M.,Gila, B.P.,Baik, K.H.,Pearton, S.J.,Jang, Soo-Hwan,Kang, B.S.,Ren, F. The Institute of Electronics and Information Engin 2005 Journal of semiconductor technology and science Vol.5 No.2
The effect of different surface passivation films on blue or green (465-505 nm) InGaN/GaN multi-quantum well light-emitting diodes (LEDs) die were examined. $SiO_2$ or $SiN_x$ deposited by plasma enhanced chemical vapor deposition, or $Sc_2O_3$ or MgO deposited by rf plasma enhanced molecular beam epitaxy all show excellent passivation qualities. The forward current-voltage (I-V) characteristics were all independent of the passivation film used, even though the MBE-deposited films have lower interface state densities ($3-5{\times}10^{12}\;eV^{-1}\;cm^{-2}$) compared to the PECVD films (${\sim}10^{12}\;eV^{-1}\;cm^{-2}$), The reverse I-V characteristics showed more variation, hut there was no systematic difference for any of the passivation films, The results suggest that simple PECVD processes are effective for providing robust surface protection for InGaN/GaN LEDs.
( Byoung Hyuck Kim ),( Eui Kyu Chie ),( Kyu Bo Kim ),( Jin Young Jang ),( Sun Whe Kim ),( Sae Won Han ),( Do Youn Oh ),( Seock Ah Im ),( Tae You Kim ),( Yung Jue Bang ),( Sung W Ha ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: To date, there is a paucity of information regarding optimal radiation dose after microscopic positive (R1) resection in patients with extrahepatic bile duct cancer. This study was conducted to evaluate the impact of radiation dose escalation for R1 resection margin (RM). Methods: A retrospective review was performed on 251 patients who underwent curative resection followed by adjuvant chemoradiotherapy between 1995 and 2009. Eighty-six patients had R1 RM which included invasive carcinoma (n=63) and carcinoma in situ/high-grade dysplasia (n=23). Among them, 54 patients received radiation dose < 54 Gy (range, 40-50.4 Gy) and 32 patients received = 54 Gy (range, 54-56 Gy). Concomitant fi uoropyrimidine-based chemotherapy was administered. Acute and late gastrointestinal (GI) toxicity were evaluated using Radiation Therapy Oncology Group criteria. The median follow-up duration was 27 months for all patients and 92 months for survivors. Results: Radiation dose = 54 Gy was associated with improved locoregional control (LRC) (5yr rate, 73.8% vs. 47.1%, p = 0.038), but not disease-free survival (5yr rate, 43.4% vs. 32.6%, p = 0.427) and overall survival (5yr rate, 40.6% vs. 29.6%, p = 0.393). In multivariate analysis for LRC, R1 with invasive carcinoma (HR 3.31, 95% CI 1.11-9.85, p = 0.032) and radiation dose < 54 Gy (HR 3.09, 95% CI 1.14-8.39, p=0.027) were independent adverse prognostic factors. Between the two dose groups, there was no signifi cant difference in acute GI toxicity =grade 2 and in late GI toxicity =grade 3. Conclusions: The current study demonstrated that radiation dose = 54 Gy was associated with improved LRC in patients with R1 RM and also well tolerated. Therefore, dose escalation could be considered for R1 RM. Prospective study is needed to verify these results.
물속에서 미세플라스틱을 제거할 수 있는 탐구 활동의 탐색
이혁진 ( Hyuck Jin Lee ),김응찬 ( Eungchan Kim ),최항 ( Hang Choi ),장낙한 ( Nak Han Jang ),김현정 ( Hyun Jung Kim ) 한국현장과학교육학회 2021 현장과학교육 Vol.15 No.2
본 연구는 대학부설 영재원에 재학 중인 중학교 2학년 학생들이 중학교 교육과정에서 접하는 과학 원리를 활용하여 물속의 미세플라스틱을 제거하기 위한 방안을 탐색해보았다. 학생들은 쉽게 접할 수 있는 물질을 활용한 거름 방법을 선택하여, 필터에 따른 미세플라스틱의 제거 효과를 탐색해보았다. 필터로는 거름종이, 커피 필터, 숯을 선택하여 물속의 미세플라스틱을 거르고, 조도계의 광도를 이용한 방법과 여과액을 증발시켜 남은 미세플라스틱의 질량을 측정하여 미세플라스틱의 제거 효과를 분석하였다. 연구결과, 학교실험에서 쉽게 접하는 거름종이가 미세플라스틱을 효과적으로 제거할 수 있었다. In this study, middle school students (second grade) from an university science education institute for the gifted investigated the elimination of microplatics in water based on their scientific knowledge from science classes in middle school. The students tried to remove microplastics in water. The students chose filtration, that they are familiar with the method, to get rid of microplastics and tried to verify the best material for the filter. Microplastics were filtered through a filter paper (from a science laboratory), a coffee filter, or charcoal. Then, brightness of the solution after filtering and the mass of the penetrated microplastics through the filters were measured to determine the best filter for microplastics. Through multiple experiments, a filter paper, the students can easily apply, was presented as the most effective filter to remove microplastics.