4H-SiC JBS Diode의 전기적 특성 분석

이영재,조슬기,서지호,민성지,안재인,오종민,구상모,이대석,Lee, Young-Jae,Cho, Seulki,Seo, Ji-Ho,Min, Seong-Ji,An, Jae-In,Oh, Jong-Min,Koo, Sang-Mo,Lee, Deaseok 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.6

1,200 V class junction barrier schottky (JBS) diodes and schottky barrier diodes (SBD) were simultaneously fabricated on the same 4H-SiC wafer. The resulting diodes were characterized at temperatures from room temperature to 473 K and subsequently compared in terms of their respective I-V characteristics. The parameters deduced from the observed I-V measurements, including ideality factor and series resistance, indicate that, as the temperature increases, the threshold voltage decreases whereas the ideality factor and barrier height increase. As JBS diodes have both Schottky and PN junction structures, the proper depletion layer thickness, $R_{on}$, and electron mobility values must be determined in order to produce diodes with an effective barrier height. The comparison results showed that the JBS diodes exhibit a larger effective barrier height compared to the SBDs.

한류 여배우에 나타난 패션이미지의 의미구조와 구성요인

이영재(Young Jae Lee) 한국디자인문화학회 2014 한국디자인문화학회지 Vol.20 No.4

본 연구는 한류 한국 여배우들의 이미지를 정성적인 방법과 정량적인 방법으로 분석하여 패션스타일의시각적 평가를 통한 객관적 결과를 도출하는 것이 목적이다. 연구문제는 아래와 같다. 첫째, 외국인에게 널리 인지되어있고 좋아하는 한류 여배우들에 대해 알아본다. 둘째, 한류 여배우들 패션이미지를 나타내는형용사를 추출함으로써 그 의미구조를 알아본다. 셋째, 한류 여배우들의 이미지 구성 요인을 분석한다. 연구방법은 선정된 여배우들에 대한 정성적 연구와통계처리에 의한 정량적 연구를 병행하였다. 연구대상인 여배우 선정은 국내 대학교 유학중인 외국인 학생을 대상으로 좋아하는 한류여배우를 응답하도록 하였다. 조사결과 빈도수가 높은 이영애, 최지우, 전지현,송혜교 4명을 선정하여 패션디자인 전공 전문인을 대상으로 1차 조사를 실시하였다. 즉, 각 각 20개씩 80개의 이미지 컷을 골라 자극물을 선정하였다. 2차로이미지를 보고 자유연상법에 따라 형용사를 기술 하도록하여 최종 26쌍의 형용사쌍을 선정하여 의미미분척도로 설문조사하였다. 이는 한류 여배우들 패션이미지를 나타내는 의미구조를 알아내기 위한 작업으로주성분분석과 베리맥스(Varimax) 회전으로 분석결과를 도출하였다. 그 결과 요인1은 ‘예쁜-예쁘지 않은’을포함한8개의 형용사쌍으로 구성되어 매력성 요인으로나타났다. 요인2는 ‘품위있는-품위없는’을 포함한 7개의 형용사쌍으로 구성되어 품위성 요인이라 하였다. 요인3은 ‘페미닌한-매니쉬한’을 포함한 5개의 형용사쌍으로 구성되어 패션성 요인으로 나타났다. 요인4는‘활동적인-비활동적인’을 포함한 4개의 형용사쌍으로구성되어 활동성요인이라 하였다. 요인5는 ‘부드러운-딱딱한’을 포함한 2개의 형용사쌍으로 구성하여 경연성 요인으로 나타났다. 한류 여배우들의 이미지 구성 요인을 분석한 결과전체 변량비율은 매력성 요인이 28.6, 품위성 요인이15.3, 패션성 요인이 11.9, 활동성 요인이 8.1, 경연성요인이 4.3으로 나타나 이들 요인 중에서 매력성 요인이 한류 여배우들의 이미지를 나타내는 가장 중요한요인으로 나타났으며 그 다음 으로 품위성 요인, 패션성 요인, 활동성 요인, 경연성 요인 순이다. 특히, 5개요인이 전체 변량에서 차지하는 비율이 68.2% 중에서매력성 요인, 품위성 요인, 패션성 요인이 전체변량의50%를 넘어서 이 세 요인이 한류여배우 이미지를 표현하는 중요한 구성 요인임을 알 수 있었다. This study is aimed at drawing an objective result for the Hallyu actresses’ images through qualitative analysis and quantitative analysis for their fashion styles. Major research problems are as follows; (1) Inquire the Hallyu actresses who are widely recognized and loved by foreigners, (2) find out adjectives representing their fashion images and grasp their semantic structure, (3) analyze image organization factors for them. The objective result of this study is drawn from qualitative analysis for actresses selected and quantitative analysis of statistics process. The actresses are selected based on the survey of foreign students studying in Korea. At first, 80 image cuts for Young-ae Lee, Jee-woo Choi, Jee-hyun Jun, Hae-Gyo Song are selected by fashion experts. Then, they describe adjectives associating their image cuts by free association method. Finally, 26 pairs of adjectives are chosen, and the survey is done for them according to sematic deferential scale. I draw a conclusion by component analysis and varimax to know the meaning that Hallyu actresses’ fashion images stand for. As a result, the factor-1 clarifies ‘attractiveness’ consisting of 8 pairs of adjectives including ‘pretty-not pretty’. The factor-2 clarifies ‘dignity’ consisting of 7 pairs of adjectives including ‘gracious-not gracious’. The factor-3 clarifies ‘fashionity’ consisting of 5 pairs of adjectives including ‘feminine-not feminine’. The factor-4 clarifies ‘activity’ consisting of 4 pairs of adjectives including ‘active-not active’. The factor-5 clarifies ‘rigidity’ consisting of 2 pairs of adjectives including ‘soft-hard’. As a result of analyzing the image organization factors for the Hallyu actresses, the attractiveness factor is 28.6%, the dignity factor 15.3%, the fashionity factor 11.9%, and the activity factor 8.1%, according to priority. Among these factors, attractiveness is the most important factor that represents the Hallyu actresses’ images and followed by the dignity, fashionity, and activity factors. It shows that the total rate of attractiveness, dignity and fashionity is greater than 50%, which draws a final result that these 3 factors are important element representing the Hallyu actresses’ image.

시공간 영상분석에 의한 실시간 교통정보 산출기법

이영재,이대호,박영태,Lee, Young-Jae,Lee, Dae-Ho,Park, Young-Tae 대한전자공학회 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.4

도로 위에 설치된 카메라에서 획득한 입력 영상으로부터 각 차선의 통과 차량수, 차량속도 도로 점유율, 차간 거리, 차종 등의 교통정보를 실시간으로 산출하는 기법은 지능형 교통 시스템(ITS)의 핵심 분야이다. 본 논문에서는 검지영역의 시공간 영상 분석에 의해 다양한 기상 조건과 그림자 등의 환경의 변화에 민감하지 않은 교통정보 산출기법을 제안한다. 각 차선에 2개의 검지영역을 설정하고 검지영역의 통계적 특성과 형상적 특성을 이용해 도로영역, 그림자 영역, 차량영역으로 분류하여 차량을 검지하며 시공간 영상 분석을 통하여 정량적 교통정보를 산출한다. 제안한 기법은 영상의 국부 검지영역 데이터만을 사용하므로 1초에 30 프레임이상의 실시간 처리가 가능하며 기상 조건과 그림자의 변화에 견실한 차량검지 및 교통정보 산출 능력을 구현할 수 있다. Real-time extraction of traffic information such as the number of vehicles passing, speed, road-occupancy rate, distance between vehicles, and vehicle types from the traffic scenes acquired from the camera on the road, is a core component of the intelligent transportation system(lTS) We present a scheme of extracting the traffic informations based on the spatio-temporal image analysis, which is robust to the variation of weather conditions and the shades. The images of two detection regions for each traffic lane are classified into one of the three categories: the road, the vehicle, and the shade, using the statistical and structural features Quantitative traffic informations are retrieved by analysing the two spatio-temporal images. Since only the local images of detection regions are processed, the real-time operation of more than 30 frames per second is realized while ensuring the detection performance robust to the operating condition.

앤디 워홀 (Andy Warhol) 의 작품세계와 패션계에 미친 영향 (I)

이영재(Young Jae Lee),박민여(Meen Nee Park) 한국복식학회 2000 服飾 Vol.50 No.1

Andy Warhol is one of the great artists in the modern history of art who compares favorably with Picasso. His activities had his object on pervasion of a pop art and profit of the art industry. Many previous studies on his activities have attracted and held the attention of his works of art after 1960s. However, in spite of his working as publisher of a fashion magazine, fashion illustrator, fashion model, displayer, and etc. in 1950s, there are few studies on his activities of 1950s. Hence, this study investigates his works of art in 1950s and intensively analyzes his effect on modern fashion. In 1950s, Andy Warhol had already been distinguished in works of art from other commercial designers through the illustration for advertising design, window display of stores, and usage of Hollywood stars as an essential element in his works for whom he had sighed when he was young. His works were also characterized by a rejection of the originality of commercial arts. He had an great effect on youth`s fashion in 1950s and 1960s, Their fashion style and images, at that time, were progressive and opposite to a mainstream of pop cultures, which caused industry manufacturers and consumers to understand their subculture. As a result, it is concluded that Andy Warhol took the lead in the fashion in 1950s and his activities in 1950s had influence on the diffusion of the public punk fashion in 1970s and the street fashion in 1980s.

산중에 위치한 공공보존기록관의 산림화재 방호를 위한 드렌처노즐 수막방호시스템의 실험연구

이영재,박형주,Lee. Young-Jae,Park. Hyung-Joo 한국방재학회 2013 한국방재학회논문집 Vol.13 No.1

우리나라 국보급 공공보존기록관의 대부분이 산중에 위치하고 있어 인근의 산불화재 시 만에 하나 착화가 일어나면 보존가치가 큰 기록물의 소실이 우려되는 실정이다. 따라서 인근의 산림화염과 비화불티로부터 국가보존기록 시설을 방호할 수 있는 차단시설의 설치가 필수적이다. 인근 산불의 진화에는 한계를 가지고 있어 별도의 산불화염 수막에 의한 건물외곽의 드렌처 분무 차단시스템이 강구되어야 할 것으로 조사되었다. 따라서 본 연구에서는 산불화염이 주는 고온의 복사열과 비화불티로부터 기록관 창문 등의 개구부 또는 가연성 외장재로의 확산을 차단하는 데 효과적인 드렌처 설비를 개발하여 현장에 시범적으로 적용하여 그 성능을 평가하였다. 성남에 위치한 나라기록관을 대상으로 다양한 드렌처 노즐과 분무유량을 변경하여 시범적으로 설치, 실험하여 분석하였다. 특히 기록관의 높은 건물고(약 30 m)를 고려하여 효과적으로 시설 전체를 방호하기 위해서는 분사 길이가 짧은 소구경 워터스프레이 드렌처 노즐보다는 대구경 워터 스플래쉬식 드렌처 노즐이 효과적인 것으로 분석되었다. 결론적으로 층고에 비례하여 장(長)수막을 형성하기 위해서는 워터 스플래쉬 방식의 드렌처를 사용한 수막시스템이 저비용 및 성능 면에서 가장 탁월하였음을 실험적으로 규명하였다. Most of Korea National Archives among the mountain exposed to forest fire environments, therefore, people has worried about their burn-out from neighbouring forest fires. It is necessarily protected from both flame radiant and flying fire-flakes. It has investigated that special water-screen protection system become one of the alternatives for preventing them from neighbouring forest fires due to limitation on extinguishing ability of fire regional fire departments. This study has focused on a development and assessment of various water-screen protection system formed by drencher nozzles for prevention the Nara national archive facility from igniting flame radiant and fire-flakes. Because a water-screen protection system using water-splash nozzles installed on surrounding roof-top line only has proved very effective, we could accept the effect of binding capacity of splash water droplets in terms of screening films`s quality.

후열 처리에 따른 Ga₂O₃/4H-SiC 이종접합 다이오드 특성 분석

이영재,구상모,Lee, Young-Jae,Koo, Sang-Mo 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.2

Ga₂O₃/n-type 4H-SiC heterojunction diodes were fabricated by RF magnetron sputtering. The optical properties of Ga₂O₃ and electrical properties of diodes were investigated. I-V characteristics were compared with simulation data from the Atlas software. The band gap of Ga₂O₃ was changed from 5.01 eV to 4.88 eV through oxygen annealing. The doping concentration of Ga₂O₃ was extracted from C-V characteristics. The annealed oxygen exhibited twice higher doping concentration. The annealed diodes showed improved turn-on voltage (0.99 V) and lower leakage current (3 pA). Furthermore, the oxygen-annealed diodes exhibited a temperature cross-point when temperature increased, and its ideality factor was lower than that of as-grown diodes.

Tactile Sensing for Virtual Interaction as a Part of Ubiquitous Game Development

이영재,Lee, Young-Jae The Korea Institute of Information and Commucation 2007 한국정보통신학회논문지 Vol.11 No.6

유비쿼터스게임을 디자인하고 개발하기 위하여 현실세계과 가상세계와의 자연스럽고 다양한 상호작용이 필요하다. 이는 물리적인측면 뿐 아니라 상황변화에 알맞은 대응 감지기술을 필요로한다. 이를 위하여 가상세계와의 유저인터페이스 모델을 정의하고 이를 구현하기 위하여 텍타일감지 시스템을 제작하였다. 텍타일 데이터는 외부환경에 민감하므로 신호처리방법을 사용하여 잡음을 제거하고 유저인터페이스를 위한 데이터 형태로 외부입력을 분석 추론하였다. 이는 일반적인 게임에서 사용하는 마우스나 키보드에 따른 입력과 전혀 다른 형태의 입력으로 유비쿼터스 환경에서의 플레이어의 상황대응에 대한 중요한 정보를 제공하여준다. 구현한 시스템을 통하여 가상공간상에 존재하는 공에 작용한 힘을 3차원적으로 분석하여 힘의 위치, 크기, 분포, 방향 등을 분석하는 방법을 제시 해보았으며 이 같은 실세계 정보 분석을 통하여 가상공간상에서 3차원적인 자연스러운 반작용이 가능하도록 하는 가능성을 보였다. 이 같은 방법들은 유비쿼터스 게임의 상호작용 개발을 위한 기초자료로 사용될 수 있다. In order to design and develop a ubiquitous game, it is necessary to develop a natural and flexible interface between the real world and the virtual world, based on social and physical context awareness. We design user interface model and the tactile sensing system that performs virtual interaction and collection of the sensor data. It is sensitive so the collected data should be filtered, rearranged and analyzed. This information is quite different from stylus input, keyboard, button or mouse for interaction. We detect kicked 3D force position of a ball, moment of area, moment of inertia and modified ball shape using tactile sensing system and analyzed data. The results demonstrate that the proposed approach is desirable and robust as well as the results can be used realistic actions and reactions considering attack force and to make interesting environments for ubiquitous game.

웹캠과 공간정보를 이용한 체감형 기능성게임

이영재,이대호,이상봉,Lee, Young-Jae,Lee, Dae-Ho,Yi, Sang-Hong 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.9

Motion based serious game is a new style of game and exercise using hands, arms, head and whole body. At that time gamer's reachable movement space is an important game space and interaction happening place. We propose efficient game spatial division and analysis algorithm that gives special information for collision avoidance of game objects. We devide into 9 parts of game space and check the enemy position and upper, down, left and right side movement information of gamer and calculate optimal path for collide avoidance of the enemy. To evaluate the method, we implemented a motion base serious game that consists of a web cam, a player, an enemy, and we obtained some valid results of our method for the collision avoidance. The resole demonstrated that the proposed approach is robust. If movement information is in front of enemy, then the enemy waits and finds the place and runs to avoid collision. This algorithm can be used basic development of level control and effective interaction method for motion based serious game. 웹캠을 사용한 체감형 기능성게임은 손과 팔 머리 등 온몸을 인터페이스로 사용하는 게임과 운동을 병행하는 새로운 형태의 게임이다. 이때 게이머의 움직임이 미치는 공간이 게임 정보공간으로 이 공간상에 가상객체와의 상호작용이 발생하는 곳이다. 이 공간을 효과적으로 분할, 분석하여 게이머의 공격으로부터 적 캐릭터가 효과적으로 피할 수 있는 방법을 제안한다. 본 논문에서는 게임 공간을 9등분하여 적 캐릭터의 위치와 상, 하, 좌, 우의 게이머의 움직임 정보를 이용하여 충돌 회피를 구현한다. 이를 검증하기 위하여 웹캠, 게임플레이어, 적 캐릭터로 구성된 체감형 기능성 게임을 제작하고, 제안한 기법을 사용하여 충돌 회피를 실험하여 그 타당성을 확인하였다. 특히 적 캐릭터 앞 공간 영역에 움직임 정보가 있는 경우 제자리 뛰기를 하면서 기다리며 충돌회피 공간을 찾음으로써 보다 재미있고, 효과적인 충돌회피가 가능하였다. 제안한 알고리즘은 웹캠을 이용한 체감형 기능성게임의 효과적인 상호작용과 레벨조정 등 개발 알고리즘으로 활용될 수 있다.

타이타늄 상악 주연결장치에 디자인에 따른 주조성 및 견고성 비교

이영재,방몽숙,양홍서,박상원,박하옥,임현필,Lee, Young-Jae,Vang, Mong-Sook,Yang, Hong-So,Park, Sang-Won,Park, Ha-Ok,Lim, Hyun-Pil 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.4

Statement of problem: Injuries along with discomfort may result on the oral mucosa when non-rigid material is used as the major connector in construction of RPD, since nonrigid major connectors transmit unstable forces throughout the appliance. Titanium which recently draws attention as a substitute of Co-Cr had a difficulty in fabricating due to high melting temperature but the development of casting technique makes it possible to apply to the clinical case. Purpose: The purpose of this study was to investigate the rigidity and the castability of titanium upper major connector by design and make a comparison with Co-Cr major connectors which are widely used in clinical cases now. Material and methods: Casting was done using CP-Ti(Grage 2) (Kobe still Co., Japan) for the experimental groups, and 4 various designs namely palatal strap, U-shaped bar, A-P strap, and complete palatal plate were casted and 5 of each designs were included in each group. For the experimental group, Universal testing machine (Model 4502; Instron, Canton, Mass) was used to apply vertical torsional force vertically to the horizontal plane of major connector. In the second experiment, Vertical compressive force was applied to the horizontal plane of major connector. As a comparative group, Co-Cr major connector was equally manufactured and underwent the same experimental procedures Strain rate was measured after constant loading for one minute duration, and statistical analysis was done with SPSS ver.10.0 for WIN(SPSS. Inc. USA). From the one-way ANOVA and variance analysis (P=0.05), Scheffe's multiple comparison test implemented. Results: 1. Least amount of strain was observed with complete palatal plate followed by A-P bar, palatal bar, and the U-shaped bar having most amount of strain. 2. In all designs of titanium major connector, less strain rate was observed under compressive loading than under torsional loading showing more resistance to lateral force. 3. For titanium major connector, less strain rate was observed when the force is applied to the first premolar area rather than to the second molar area indicating more strength with shorter length of lever. 4. In Comparison of Co-Cr major connector with titanium major connector, palatal strap and U-shaped bar designs showed higher strength under torsional force that is statically significant, and under compressive force, no significant difference was observed expert for U-shaped bar. 5. In titanium major connector, complete palatal plate showed lowest success rate in casting when compared with the Co-Cr major connector. Conclusion: Above results prove that when using titanium for major connector, only with designs capable of generating rigidity can the major connector have almost equal amount of rigidity as Co-Cr major connector and show lower success rate in casting when compared with the Co-Cr major connector.

척산천의 다기능 어도의 구조 해석

이영재,이정신,김문기,박성식,장형규,Lee, Young Jae,Lee, Jung Shin,Kim, Mun Gi,Park, Sung Sik,Jang, Hyeong Kyu 한국농공학회 2017 한국농공학회논문집 Vol.59 No.1

In this study, the validity and applicability of the multipurpose fishway which has been constructed for the upstream migration of fish at Chuksan river in Uljin is assessed and analyzed by a commercial software. The upper slab types of fishway in this investigation are reinforced concrete slab (S1 type) and reinforced concrete slab with steel plate (S2 type). The three different sizes of subway passage ($0.8m{\times}0.1m$, $0.8m{\times}0.2m$, $0.8 m{\times}0.3m$) and velocities (0.6 m/s, 1.2 m/s, 1.8 m/s) of Chuksan fishway was investigated and compared for the Chuksan in government design code. The analysis showed that the maximum stress and bending moment of S1 type decreased 1~21 % and 12~27 % compared to the Chuksan in government design code, respectively. Also, the maximum stress of and bending moment of S2 type decreased 11~32 % and 27~39 %. From the numerical analysis, it was found that the S2 type was greatly effective and the subway passage size of $0.8m{\times}0.2m$ was most safe. This result can be utilized to be the basic data for design of the Multipurpose fishway.