고출력 CSP-LOC 레이저 다이오드의 모우드 특성에 관한 연구

윤석범,오환술,Yoon, Seok-Beom,Oh, Hwan-Sool 대한전자공학회 1988 전자공학회논문지 Vol. No.

본 논문은 최적의 고출력용 (GaAl) As/GaAs CSP-LOC 레이저 다이오드 구조를 설계하기 위하여 컴퓨터 시뮬레이션 하였다. 실험 데이터를 근거로한 레이저다이오드의 설계변수로 각 층의 두께, 흡수계수, 스트라이프 폭등이 사용되었고 활성층(d2)와 광 도파로층(d3)의 두께가 각각 0.08um, 0.5um일때와 0.1um, 0.4um일때 최적의 안정된 고출력용 CSP-LOC 구조를 얻었다. 따라서 본 노문에서는 실용적인 반도체레이저의 컴퓨터 시뮬레이션 프로그램을 개발하였고 임의의 재료를 갖는 CSP-LOC 구조에 이 프로그램의 적용이 가능하다. In this paper, we have optimized the computation of the CSP - LOC (Channel Substrate Planar-Large Optical Cavity) structure to design the gith power (Ga, Al) As/GaAs CSP-LOC laser diode. The parameters of the device on the bases of experimental datas include the effects of the various layer thickness, material absorption coefficients, stripe width and so forth. At active layer ($d_2$)=0.08 um with optical layer ($d_3$)=0.5 um and $d_2$ = 0.1 um with $d_3$ = 0.4 um, we find the narrower beam divergence and stable high power in the lowest-order mode without the phenomenon of spatial hole burning. The results of theoretical computation show good agreement with experimental measurements made on LPE grown CSP-LOC. Finally, we developed an practical program and the program is applicable to the CSP-LOC lasers with any materials.

노트 필기를 사용한 온라인 학습이 학업성취도에 미치는 영향

윤석범,장은영,Yoon, Seok-Beom,Chang, Eun-Young 한국실천공학교육학회 2022 실천공학교육논문지 Vol.14 No.2

In this study, we study the effects of note-taking skills on students' academic performance, satisfaction, and concentration, and immersiveness when students are taking online classes. The Cornell note format was used for the note-taking skills. The survey result shows that note-taking skills in online class increase students' diligence, participation, and concentration. We find a strong positive correlation between the number of Cornell note submission and academic performance, and we show that the association between two is a statistically significant by using simple/multiple regression analysis. The multiple regression result shows that one unit increase in the Cornell note submission is associated with the increase in 0.253 midterm score on average. In addition, one unit increase in the Cornell note submission is associated with increase in 0.287 final exam score on average. Further, we conduct bootstrapping regression as a robustness test and show that the results are consistent with the simple/multiple regression results. These analyses show that Cornell note taking skills in online classes can be beneficial for students to improve the quality of their learning.

헤르만 헤르츠버거 작품으로 본 현대공간의 어포던스디자인에 관한 연구

윤석범(Yoon, Seok-Beom),신홍경(Shin, Hong-Kyung) 한국실내디자인학회 2011 한국실내디자인학회 학술대회논문집 Vol.13 No.3

An aspect of space is changing. Existing space-centric or function-centric aspect is proceeding to user-centric aspect. It is not changed. Before, the space was impossible that it was considered of user"s convenience or their behavior. In the past, it was not only just the structure and function but also the form and exterior was existing because of the development of skill and industry. Now, however, it is becoming more important of the awareness between the user and environment as well as the function and form of the space. The awareness between these two take a side of an emotional and psychological view that users feel and experience in the space. Moreover, this kind of environment is breaking down into individual members in the general field of modern society. In this way, it is possible to recognize the importance of new purpose as users satisfaction in the space. Therefore, Affordance is an important and useful concept because of the relationship from an ecology and cognitive psychology to present field of design. As a result, the purpose of this research is to prepare a foundation of the following modern space by analysing its character and feature through Herman Hertzberger‘s aspect and understand the concept of the affordance that is a great importance of users" awareness and sensibility about the spacial environment.

OLED 조명 광원의 광 균일도 향상

윤석범(Seok-Beom Yoon),양현진(Hyun-JinYang),이상규(Sang-Kyu Lee) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10

MEH-PPV 와 PCBM을 이용한 태양전지 제작 및 I-V 특성 분석

윤석범(Seok-beom Yoon),류장렬(Jang-ryeol Ryu) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.4

Polymer solar cells based on the MEH-PPV(poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene) and PCBM(fullerene derivative [6,6]-phenyl-C<SUB>61</SUB>-butyric acid methyl ester) were fabricated by spin casting, and characterized with electrical and optical measurement. The Solar Cell device structures were ITO/PEDOT/MEH-PPV:PCBM/TIO2/Al and ITO/PEDOT/MEH-PPV/TIO2/Al. A solar simulator was using AM 1.5 illumination condition for measuring the current-voltages. The current density Jsc was 2.25㎃/㎠, open circuit voltage Voc was 0.62V, and FF (Fill Factor)was 38.55% in MEH-PPV:PCBM active layer device. The current density Jsc was 169.8㎂/㎠, open circuit voltage Voc was 0.63V, and FFwas 30.45% in MEH-PPV active layer device. The improved performance has been achieved with blend polymer MEH-PPV with PCBM in a ratio of 1 : 3 by weight.

신규 합성 청색재료를 사용한 백색 유기발광소자의 광학적ㆍ전기적 특성평가

윤석범(Seok Beom Yoon) 한국컴퓨터정보학회 2005 韓國컴퓨터情報學會論文誌 Vol.10 No.1

백색발광은 풀칼라, 백라이트 및 조명을 위한 전자발광 소자로의 응용에 매우 중요하다. 본 논문에서는 오렌지 발광을 내는 Rubrene 색소를 포함하는 청색 재료인 nitro-DPVT 박막을 사용한 단분자 유기 백색발광소자를 구현하였다. 제작된 소자의 기본적 구조는 α-NPD / nitro-DPVT / nitro- DPVT:Rubrene / BCP/ Alq3. 이다. 알루미늄은 음극재료로 사용하였으며 양극 재료는 ITO를 사용하였다. 백색 발광 스펙트럼은 가시광선 전 영역에 걸쳐 나타났고 14V에서 발광된 빛의 C.I.E. 색좌표는 (0.3347,0.3515)이다. 동작개시 전압은 2.5V이하에서 나타났고 양자효율은 0.35%이었다. White light emission is very important for applying electroluminescent device to full display, backlight and illumination light source. In this letter, Multilayer molecular organic white-light-emitting device using thin film of blue material nitro-DPVT with fluorescent dye Rubrene for an orange emission were fabricated. The basic structure of the fabricated device is α-NPD / nitro-DPVT / nitro- DPVT:Rubrene / BCP/ Alq3. Aluminum is used as the cathode material and ITO was anode material. The white light emission spectrum covers a wide range of the visible region and the Commission Internationale de I'E clairage (C.I.E.) coordinates of the emitted light was ((0.3347, 0.3515) at 14V. The turn voltage is as low as 2.5V and quantum efficiencies are 0.35%.

MEH-PPV:PCBM 활성층을 갖는 유기 태양전지 제작

윤석범(Seok-beom Yoon),류장렬(Jang-ryeol Ryu) 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-

스핀코팅 방법을 사용하여 MEH-PPV:PCBM을 활성층으로 하는 유기형 태양전지를 제작하였다. 제작된 소자의 구조는 양극 전극으로 시용하는 투명전극 ITO, 정공 주입 층 PEDOT:PSS, 활성 층으로 사용하는 MEH-PPV:PCBM, 정공 금지 층 TiOx, 음극 전극 Al이었다. MEH-PPV:PCBM의 두께 변화 및 MEH-PPV와 PCBM의 블렌딩 비율을 조절하여 전류-전압 특성을 조사하였다. 측정된 전류-전압 조건은 AM 1.5 조사로 측정하였다. 측정된 태양전지 소자에서 활성층 두께는 76㎚ 전류밀도 Jsc는 2.62 ㎃/cm2, 개방전압 Voc는 0.61V이다. We fabricated Organic Photovoltaic Cell of a active layer with MEH-PPV:PCBM by using spin casting method. The structure of fabricated devices was a transparent ITO using the positive electrode. the PEDOT:PSS of a hole injection layer, MEH-PPV:PCBM using active layer, TiOx of hole blocking layer, and metal electrode Al for the negative electrode. We characterized the current-voltage of device for the thickness change of MEH-PPV:PCBM and MEH-PPV with PCBM blending ratio. We show the active layer thickness was 76㎚, current density Jsc was 2.62 ㎃/cm2, open circuit voltage Voc 0.61V in blending single layer polymer photovoltaic cells..

1MeV 인 이온 주입시 RTA에 의한 미세결함 특성과 latch-up 면역에 관한 구조 연구

노병규,윤석범,Roh, Byeong-Gyu,Yoon, Seok-Beom 한국전기전자학회 1998 전기전자학회논문지 Vol.2 No.1

인(Phosphorus)을 1MeV로 이온 주입한 후 RTA를 실시하여 미세결함의 특성을 조사하고, 면저항, SRP, SIMS, XTEM 분석과 CMOS 구조에서 래치업 특성을 모의 실험하였다. 도즈량이 증가할수록 면저항은 낮아지고, Rp값은 도즈량이 $1{\times}10^{13}/cm^2,\;5{\times}10^{13}/cm^2,\;1{\times}10^{14}/cm^2$일때 각각 $1.15{\mu}m,\;1.15{\mu},\;1.10{\mu}m$로 나타났다. SIMS 측정결과는 열처리 시간이 길수록 농도의 최대치가 표면으로부터 깊어지고, 농도 또한 낮아짐을 확인하였다. XTEM 분석 결과는 열처리 전에는 결함측정이 불가능했으나, 측정되지 많은 미세결함이 열처리 후 이차결함으로 성장한 것으로 조사되었다. 모의 실험은 buried layer와 connecting layer 구조를 사용하였으며, buried layer보다 connecting layer가 래치업 특성이 우수함을 확인하였다. Connecting layer의 도즈량이 $1{\times}10^{14}/cm^2$이고 이온주입 에너지가 500KeV일 때 trigger current는 $0.6mA/{\mu}m$이상이었고, trigger voltage는 약 6V로 나타났다. Connecting layer의 이온주입 에너지가 낮을수록 래치업 저감효과가 더욱 우수함을 알 수 있었다. This paper is studied micro-defect characteristics by phosphorus 1MeV ion implantation and Rs, SRP, SIMS, XTEM for the RTA process was measured and simulated. As the dose is higher, the Rs is lower. When the dose are $1{\times}10^{13}/cm^2,\;5{\times}10^{13}/cm^2,\;1{\times}10^{14}/cm^2$, the Rp are $1.15{\mu}m,\;1.15{\mu},\;1.10{\mu}m$ respectively. As the RTA time is longer, the maximum concentration position is deeper from the surface and the concentration is lower. Before the RTA was done, we didn't observe any defect. But after the RTA process was done, we could observe the RTA process changed the micro-defects into the secondary defects. The simulation using the buried layer and connecting layer structure was performed. As results, the connecting layer had more effect than the buried layer to latch-up immune. Trigger current was more $0.6mA/{\mu}m$ and trigger voltage was 6V at dose $1{\times}10^{14}/cm^2$ and the energy 500KeV of connecting layer Lower connecting layer dose, latch-up immune characteristics was better.

4차 산업혁명 시대 공학 분야의 진입 능력 함양을 위한 집중 이수제 공학 교육 운영에 관한 연구

장은영 ( Eun-young Chang ),윤석범 ( Seok-beom Yoon ) 한국실천공학교육학회 2021 실천공학교육논문지 Vol.13 No.2

대학 자체로 선정한 대학 고유의 핵심 6개 역량들 중에서 측정된 부족한 사항들을 강화시켜 교육 목표에 도달하기 위해, 학생융합적 사고 역량과 자기 계발 역량을 최대화하는 집중 이수형 과목 형태로 공학 관련 전공 콜라주 과목을 신설하였다. 학부/학과간 공유형 교육과정으로 진행하였고, 2020학년 1,2학기 각각에서 2개 이수 집단(전기전자제어공학부 전자공학전공; 26명, 광공학과; 28명) 54명을 대상으로 공통된20개 문항들의 설문 결과를 종합, 분석하였다. 그 결과 응답자75% 이상이 장소와 시간에 자유로운 온라인 학습에 긍정적이었고, 녹화된 동영상 학습 시간내 추가적인 상호작용 활동들과 팀티칭(team teaching) 방식을 보강한 집중 이수 형태는 학습 효과를 극대화할 수 있다고 판단한다. It has been determined the 6 core competencies of our university students. Among them, it was judged that the student’s convergence thinking ability and self-development ability were insufficient. To enforce the two insufficient abilities, an engineering-related major collage course was newly established in the form of an intensive coursework. The course was conducted as a shared curriculum between division/departments. For each of the first and second semesters in the 2020, 54 students from two completion groups (Department of Electrical and Electronic Control Engineering; 26, Optical Engineering; 28) were the subjects of the survey, the survey results of 20 common questions were comprehensively analyzed. As the result, more than 75% of the respondents were positive about free online learning at any time and place. And if additional interactive activities and team teaching method are reinforced during recorded audio and video contents learning material, It is confirmed that the attempted intensive course can maximize the learning effect.

소형 무인기 또는 스마트폰(smartphone)을 활용한 종합 설계교과와 졸업 작품 제작 활동의 운영 방안 연구

장은영 ( Eun-young Chang ),윤석범 ( Seok-beom Yoon ) 한국실천공학교육학회 2016 실천공학교육논문지 Vol.8 No.1

본 연구에서는 종합 설계 교과와 학부 졸업기준이 되는 졸업 작품 구성에 관련된 주제 설정 및 작품 완성 단계까지 지도교수역할과 학생들의 진행 절차를 요약하고, 결과에 대한 학생들의 만족도를 조사 분석하였다. 1-2인을 1개조로 하여 담당교수를 지정하고 면담 및 기술 지도를 실시하였으며, 팀별로 자체 주제를 선정하도록 유도하였고, 2011년부터 2015년 12월까지 진행된 내용 중에서 소형 무인기 또는 스마트폰을 이용한 주제들에 대해 그 구성 결과를 제시하고, 2011년과 2015년 각각에서 1개 전공의 참여 학생들에 대한 작품 제작 활동 결과에 대해 설문 조사된 내용을 비교, 분석하였다. 이를 바탕으로 다음 학년도 개선사항에 대해 검토하고, 지속적인 교육 개선을 이루어 열정과 도전 정신을 갖춘 융합형 창의 인재가 양성되고 취업 및 창업과 연결되는 선순환 구조를 형성하는 방안을 공유한다. In this paper, the proceedings and core procedures that involved the role of advisor to the theme, the set up rule of students, and complete the work steps involved in configuring graduate work that the overall design curriculum and graduation standards are summarized. The one or two students are designated as one team, and by the designated professor was conducted a discussion and technical guidance. Among various topics from 2011 to 2015, some specific results configured using a small drone and smartphones are presented. The survey are compared the activity results for the participating students in one major each in 2011 and 2015 and analyzed. Based on this review for improvement next year notes, it forms a continuous improvement, and has converged talents with passion and challenging spirit, sharing a plan to form a virtuous cycle that is associated with positive employment and entrepreneurship.