정오표 : 화합물 합성반응 중 Fridel - Crafts Acylation 공정에서의 폭주반응 위험성평가

이광호,김원성,전진우,주영종,박교식,Lee, Kwangho,Kim, Wonsung,Jun, Jinwoo,Joo, Youngjong,Park, Kyoshik 한국안전학회 2021 한국안전학회지 Vol.36 No.5

수중 환경에서 고분자 전해질 연료전지(PEMFC) 공급용 수소 생산을 위한 가압 디젤 개질시스템에 관한 연구

이광호,한광우,배중면,Lee, Kwangho,Han, Gwangwoo,Bae, Joongmyeon 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4

Fuel cells have been spotlighted in the world for being highly efficient and environmentally friendly. A hydrogen which is the fuel of fuel cell can be obtained from a number of sources. Hydrogen source for operating the polymer electrolyte membrane fuel cell(PEMFC) in the current underwater environment, such as a submarine and unmanned underwater vehicles are currently from the metal hydride cylinder. However, metal hydride has many limitations for using hydrogen carrier, such as large volume, long charging time, limited storage capacity. To solve these problems, we suggest diesel reformer for hydrogen supply source. Diesel fuel has many advantages, such as high hydrogen storage density, easy to transport and also well-infra structure. However, conventional diesel reforming system for PEMFC requires a large volume and complex CO removal system for lowering the CO level to less than 10 ppm. In addition, because the preferential oxidation(PROX) reaction is the strong exothermic reaction, cooling load is required. By changing this PROX reactor to hydrogen separation membrane, the problem from PROX reactor can be solved. This is because hydrogen separation membranes are small and permeable to pure hydrogen. In this study, we conducted the pressurized diesel reforming and water-gas shift reaction experiment for the hydrogen separation membrane application. Then, the hydrogen permeation experiments were performed using a Pd alloy membrane for the reformate gas.

화합물 합성반응 중 Fridel - Crafts Acylation 공정에서의 폭주반응 위험성평가

이광호,김원성,전진우,주영종,박교식,Lee, Kwangho,Kim, Wonsung,Jun, Jinwoo,Joo, Youngjong,Park, Kyoshik 한국안전학회 2021 한국안전학회지 Vol.36 No.3

Heat is generated during the synthesis and mixing process of chemical compounds due to a change in activation energy during the reaction. A runaway reaction occurs when sufficient heat is not removed during the heat control process within a reactor, rapidly increasing the temperature, reaction speed, and rate of heat generation inside the reactor. A risk assessment was executed using an RC-1 (Reaction Calorimeter) during Friedel-Crafts acylation. Friedel-Crafts acylation runs the risk of rapid heat generation during Active Pharmaceutical Ingredient (API) manufacturing; it was used to confirm the risk of a runaway reaction at each synthesis stage and during the mixing process. This study used experimental data to develop a safety efficiency improvement plan to control the risks of runaway and other exothermic reactions, which was implemented at the production site of a chemical plant.

핸들링 테스트 프로시져의 다이나믹 시뮬레이션

이광호(KwangHo Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

To perform vehicle dynamic simulations of handling test procedures, a suitable vehicle computer model was developed and various test procedures were considered for use with the simulation model. Details of handling test procedures are well known and predicting the results by means of the simulation is quite acceptable. First, the simulation of simple handling procedures is performed and the model is verified. This model is used to perform the computer simulation of a severe handling test procedure or rollover test procedure which is developed for the evaluation of the vehicle's rollover performance. Difficulties are encountered in the case of severe handling conditions. When a vehicle runs at high speed with high lateral acceleration, the details of the physical situation are changed. The reasons for this were studied to find the way to simulate the severe handling case with large angle, large camber angle and high lateral acceleration. ADAMS was used to perform the vehicle handling analysis.<br/>

후륜 리지드 5링크 서스펜션을 개선한 6링크 시스템의 연구

이광호(Kwangho Lee),이기연(Ghiyoun Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The rigid 5link rear suspension system is cheap, economical rear suspension system and very popular. But it has a problem, in case of the wheel bump and rebound, the lateral displacement can occur. This is bad for suspension design and vehicle handling characteristics. In this article new 6link system is introduced to reduce the lateral displacement. Assist lateral link is used to reduce the lateral displacement in 5 link system. The lateral compliance geometry change is shown by ADAMS kinematic compliance analysis and using the NASTRAN transient vibration analysis the lateral response of rear suspension can be seen.

Gate 및 Drain 바이어스 제어를 이용한 3-way Doherty 전력증폭기의 성능개선

이광호(Kwangho Lee),이석희(Sukhui Lee),방성일(Sungil Bang) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.1

본 논문에서는 차세대 무선통신 중계기 및 기지국용 50W급 Doherty 전력증폭기를 설계 및 제작하였다. Doherty 전력증폭기의 보조증폭기를 구현하기 위하여 Gate 바이어스 조절회로를 사용하였다. Gate 바이어스 조절회로는 보조증폭기를 구현할 수 있으나 Doherty 전력증폭기의 출력특성을 개선하기에는 제한된 특성을 가졌다. 이를 해결하고자 Drain 바이어스 조절회로를 첨가였다. 그리고 Doherty 전력증폭기의 효율을 개선하고자 일반적인 2-way 구조가 아닌 3-way 구조를 적용하여 3-way GDCD(Gate and Drain Control Doherty) 전력증폭기를 구현하였다. 비유전율(εr) 4.6, 유전체 높이(H) 30 Mill, 동판두께(T) 2.68 Mill(2 oz)인 FR4 유전체를 사용하여 마이크로스트립 선로와 칩 캐패시터로 정합회로를 구성하였다. 실험결과 3GPP 동작주파수 대역인 2.11GHz ~ 2.17GHz에서 이득이 57.03 dB이고, PEP 출력이 50.30 dBm, W-CDMA 평균전력 47.01 dBm, 5MHz offset 주파수대역에서 -40.45 dBc의 ACLR로써 증폭기의 사양을 만족하였다. 특히 3-way GDCD 전력증폭기는 일반전력증폭기에 비해 동일 ACLR에 대하여 우수한 효율 개선성능을 보였다. In this thesis, 50W Doherty amplifier was designed and implemented for Beyond 3G's repeater and base-station. Auxiliary amplifier of doherty amplifier was implemented by Gate bias control circuit. Though gate bias control circuit solved auxiliary's bias problem, output characteristics of doherty amplifier was limited. To enhance the output characteristic relativize Drain control circuit. And To improve power efficiency make 3-way Doherty power amplifier. therefore, 3-way GDCD (Gate and Drain bias Control Doherty) power amplifier is embodied to drain bias circuit for General Doherty power amplifier. The 3-way GDCD power amplifier composed of matching circuit with chip capacitor and micro strip line using FR4 dielectric substance of specific inductive capacity(εr) 4.6, dielectric substance height(H) 30 Mills, and 2.68 Mills(2 oz) of copper plate thickness(T). Experiment result satisfied specification of amplifier with gains are 57.03 dB in 2.11 ~ 2.17 GHz, 3GPP frequency band, PEP output is 50.30 dBm, W-CDMA average power is 47.01 dBm, and ACLR characteristics at 5MHz offset frequency band station is -40.45 dBc. Especially, 3-way DCHD power amplifier showed excellence efficiency performance improvement in same ACLR than general doherty power amplifier.

연구논문 : 한일기본조약을 “지저귀다” -트위터를 통해 본 일본사회의 담론규범의 변화

이광호 ( Kwangho Lee ) 국민대학교 일본학연구소 2015 일본공간 Vol.17 No.-

이 논문에서는 2008년 이후 일본에서도 주요 정보인프라의 하나로 성장해 온트위터(Twitter)상에서, 「한일기본조약」에 관한 어떠한 내용의 투고가 어떠한 이용자들에 의해 이루어지고 있는가를 분석했다. 일본사회 내에서는 익명성이 높은 게시판을 중심으로 이른바 ‘혐한담론’이 지속적으로 생산, 유통되어 왔는데, 트위터와 같이 경우에 따라서는 덜 익명적일 수 있는 미디어에서 과연 한국에 대해 어떠한 담론이 전개되고 있는지, 그리고 그러한 담론의 전개가 보수정권의 회귀라는 정치적 흐름 속에서 어떠한 특징을 보이고 있는지를 살펴보고자 한 것이다. 분석결과, 자민당이 실질적으로 지지를 얻기 시작한 2012년부터 한일기본조약에 관한 투고가 급증하고 있었다는 점, 거의 대부분의 투고가 자민당정권이 나 우익단체의 주장과 궤를 같이하는 ‘혐한’적인 내용이었다는 점, 그리고 투고자의 대부분이 스스로의 정치적 정체성을 국가주의나 우익으로 표명하고 있었다는 점 등이 밝혀졌다. 이러한 경향은 최근 일본사회 내에서 일어나고 있는 담론규범의 변화를 시사하는 현상임과 동시에 그러한 변화를 더욱 진전시키는 요인이 될것으로 보인다. This study analyzed tweets on ‘the Treaty on Basic Relations between Japan and Korea’ posted on the Twitter in Japan in terms of the specific assertions made and characteristics of users who posted them. In Japan, anti-Korea discourses have been continuously produced and distributed mainly on anonymous Internet discussion sites. This study has an interest in examining how ‘Korea’ has been discussed on the Twitter which is considered as a less anonymous media under certain conditions, with a special focus on the possible relations with the change of political environment in Japan resulted from ‘the return of conservative regime.’ Major findings are 1) that a rapid increase of the Treaty related tweets was observed since 2012 when Abe Shinzo’s party started to get wide public supports, 2) that most of the tweets made largely same assertions as the Japanese government and/or right-wing groups have raised, and 3) that majority of the users who posted those tweets identified themselves with nationalists, the right-leaned, or conservatives. These findings suggest that a change in discourse norms is currently occurring in Japanese society and the change might be advanced further for right wings to easily voice in the near future.

뇌파 분석을 위한 LTS 추정기법을 이용한 시계열 데이터의 효율적인 프랙탈 차원 추정

이광호(Kwangho Lee) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ

본 논문은 일차원의 시계열 데이터를 입력으로 하여 위상공간 재구성 과정을 거쳐 다차원 위상공간상에서 프랙탈 차원을 계산하는 효율적인 방법을 제안한다. 프랙탈 차원의 추정에 소요되는 계산량을 줄이기 위해 로그 연산을 비트 연산으로 대체하고, 거리계산이 순서를 바꿈으로써 위상공간의 차원에 무관한 상수 시간의 계산복잡도를 가지는 알고리즘을 구현하였다. 또한 최소절단자승 추정기법을 적용하여 로그-로그 그래프 상에서의 기울기 추정을 함으로써 프랙탈 차원이 추정치에 대한 정확도를 높였다. 참값이 알려진 시계열 데이터에 대한 차원 추정 실험을 통하여 제안된 방법의 정확성을 보였다.

한/영 통사 구조 차이와 통ㆍ번역의 문제

이광호(Lee Kwangho) 한국통번역교육학회 2015 통번역교육연구 Vol.13 No.1

This paper discusses translation problems due to the syntactic differences between Korean and English, focusing on the differences in subcategorization of verbs. Demand type verbs of English are subcategorized differently from ask type verbs, whereas Korean verbs equivalent to English verbs are subcategorized in the same way. Also believe type verbs are subcategorized differently from want type verbs even though they appear to be of the same type in subcategorization patterns. If translators are not familiar with the differences in the subcategorization of verbs, they may make errors translating Korean into English. To avoid such errors it is important for Korean-into-English translators to know the differences in syntactic properties of verbs which appear to be of a similar type. It is also necessary for translation schools to teach students about the unique syntactic properties of verbs, particularly those which may differ from language to language.

음성 스트리밍 서비스 음질 개선 및 노이즈 제거를 위한 ASRNNoise 모델 개발

이광호(KwangHo Lee),제정륭(JungRyung Je),이호욱(HoWook Lee),오동빈(Dongpin Oh),이호용(Hoyong Lee),추동원(DongWon Choo),강석우(SeokWoo Kang),송길태(Giltae Song) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12