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탄화규소 캔들형 필터의 제조 및 고온고압 하에서의 성능평가
이상훈,이승원,이기성,한인섭,서두원,박석주,박영옥,우상국,Lee, Sang-Hun,Lee, Seung-Won,Lee, Kee-Sung,Han, In-Sub,Seo, Doo-Won,Park, Seok-Joo,Park, Young-Ok,Woo, Sang-Kuk 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.5
가압유동층 복합발전용으로 사용 가능한 탄화규소 캔들형 필터를 압출성형법으로 제조하였다. 필터의 기공율을 조절하기 위해 2.5 vol%의 탄소분말을 첨가하였고, 필터의 강도를 부여하기 위해 무기결합제로써 점토와 $CaCO_3$를 첨가하였다. 평균 기공율이 약 40%, 평균 기공크기가 약 $47{\mu}m$인 지지체 위에 평균 기공크기가 약 $10{\mu}m$를 갖도록 탄화규소 분말을 분무 코팅하였고, 이후 대기압 분위기 하에서 1400${\circ}C$의 온도로 소결하였다. 코팅층이 형성된 캔들형 필터를 500${\circ}C$, $5kgf/cm^2$의 고온, 고압 하에서 성능평가를 행한 결과 입자크기별 집진 성능이 모두 99.99% 이상을 나타내었다. 따라서 제조된 탄화규소 캔들형 필터는 가압유동층 연소가스에 포함되어 있는 미세한 먼지를 효과적으로 제거할 수 있을 것으로 판단되었다. Silicon carbide candle filters for the pressurized fluidized bed combustion system were fabricated by extrusion process. Carbon black was added to control the porosity. Inorganic additives such as clay and calcium carbonate were added to exhibit appropriate strength. Silicon carbide layer with a finer pore size (mean pore diameter ~$10{\mu}m$) was coated on the silicon carbide support layer (mean pore diameter ~$47{\mu}m$, porosity ∼40%). After that, the filter was sintered at 1400${\circ}C$ in air. We evaluated the filtration performances of the filter at 500${\circ}C$ and $5kgf/cm^2$ of pressure. As a result, high separation efficiency, >99.999% was measured. It is expected that silicon carbide candle filter can be successfully used for the pressurized fluidized bed combustion system.
지능형 휠체어 적용을 위해 Haar-like의 기울기 특징을 이용한 아다부스트 알고리즘 기반의 보행자 인식
이상훈,박상희,이영학,서희돈,Lee, Sang-Hun,Park, Sang-Hee,Lee, Yeung-Hak,Seo, Hee-Don 대한의용생체공학회 2010 의공학회지 Vol.31 No.6
In this paper, we suggest an advanced algorithm, to recognize pedestrian/non-pedestrian using differential haar-like feature, which applies Adaboost algorithm to make a strong classification from weak classifications. First, we extract two feature vectors: horizontal haar-like feature and vertical haar-like feature. For the next, we calculate the proposed feature vector using differential haar-like method. And then, a strong classification needs to be obtained from weak classifications for composite recognition method using the differential area of horizontal and vertical haar-like. In the proposed method, we use one feature vector and one strong classification for the first stage of recognition. Based on our experiment, the proposed algorithm shows higher recognition rate compared to the traditional method for the pedestrian and non-pedestrian.
이상훈,Lee, Sang-Hun 대한출판문화협회 1998 출판저널 Vol.237 No.-
일상성과 일상의 사회학은 현재 우리 현실을 이해하는 새로운 지평을 열어준다. 이는 현대 사회학 이론에 대한 도전의 의미를 지닌다. 최근 소개된 '일상생활의 사회학' 관련 책을 통해 우리는 삶의 풍부함을 느낌과 동시에 현실이란 보는 시각이 다양한 만큼 다양해진다는 사실을 깨닫게 될 것이다.
이상훈,김제헌,송태영,Lee, Sang-Hoon,Kim, Jae-Hun,Song, Tae-Young 한국압력기기공학회 2014 한국압력기기공학회 논문집 Vol.10 No.1
An Operating Experience Report(OER) has written about events and accidents happened at a Nuclear Power Plant(NPP). The purpose of publishing the OER is to prevent the similar event or accident repeatedly by spreading the experience of a single plant to other plants personnel. In this paper, it is analyses that the foreign NPPs' OERs on JIT published by the International Nuclear Agency(WANO, INPO, COG, BE). The analysis introduced in this paper is performed along with the various factors such as type of work, root-cause, and equipment. The root-cause analysis about the OERs shows that the Human-error is the major factor in foreign NPPs, but on the other hand equipment problem is the main part of the Domestic NPPs. The ratio of the foreign NPP's OERs on JIT according to the type of work was applied to KHNP-JIT developed nowadays for the first time in KOREA.
2단 3상 PWM AC/DC 컨버터를 이용한 동기발전기 여자제어시스템
이상훈,이동희,안진우,Lee, Sang-Hun,Lee, Dong-Hee,Ahn, Jin-Woo 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3
동기발전기의 출력전압은 여자 시스템의 계자 전류 제어에 의해 일정하게 유지된다. 현재 대부분의 발전기 여자기의 여자전류제어를 위해 사용되는 AVR 시스템의 AC/DC 컨버터 부는 출력전압 제어가 가능한 위상제어 컨버터나 출력전압을 제어할 수 없는 다이오드 정류기와 DC/DC 컨버터를 결합하여 사용하고 있다. AC/DC 전력 변환장치로서 위상제어 컨버터나 출력전압을 제어할 수 없는 다이오드 정류기의 경우, AVR시스템의 전력을 공급하는 모선의 역률저하 및 저차 고조파 발생의 문제점을 야기 시키게 된다. 본 논문에서는 동기발전기의 여자전류 제어를 위해 사용되는 AVR 시스템 설계에 있어 단위역률 동작이 가능한 Boost형 AC/DC 컨버터와 모선의 부하변동에 속응성 있게 동작할 수 있는 전류 제어형 Buck 컨버터를 결합한 2단 3상 PWM AC/DC 컨버터에 대해 연구하였다. 제안된 AC/DC 컨버터를 시뮬레이션 한 결과 Boost 컨버터의 경우 단위 역률 동작 및 출력 DC 전압의 Boost 동작이 원할히 이루어졌으며, Buck 컨버터의 경우 다른 위상제어 컨버터에 비해 응답시간이 개선되었음을 알 수 있었다. The terminal voltage of a synchronous generator is maintained by the field current control of excitation system. Generally AC/DC converter which is component of AVR(Automatic Voltage Regulator) system for excitation current control is connected to diode rectifier and DC/DC converter system. In the case of diode rectifier system of phase controlled converter as AC/DC converter have low power factor and harmonics of lower order in the line current. In this paper, two stage three phase PWM AC/DC converter is studied to solve these problems. The characteristics of a proposed converter reduces the harmonics and reactive power of the distribution line and has fast dynamic response in transient period using boost converter and current control mode buck converts. The proposed method is verified by the computer simulation and experimental results in prototype generation system.
이상훈,최승호,Lee, Sang Hun,Choi, Seung-Ho 대한후두음성언어의학회 2017 대한후두음성언어의학회지 Vol.28 No.2
Pleomorphic adenoma is the most common salivary gland neoplasm and most of them arise in the parotid gland. Pleomorphic adenomas at other sites than salivary glands have rarely been reported. We experienced a patient with pleomorphic adenoma of larynx. A 59 year-old female patient visited outpatient clinic complaining of voice change and foreign body sensation. Round mass at right vocal process was found in laryngoscopic exam. We performed laryngoscopic microsurgery to remove the tumor. Histologically, it was diagnosed as pleomorphic adenoma. Recurrence or complication did not occur during the follow up period of 3 years.
이상훈,엔도타카오,이원철,Lee. Sang-Hun,Endo. Takao,Lee. Weon-Cheol 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
A continuing elevated bridge is replaced with mass-spring system model, and a part of the bridge is cut out as an analytical area. A viscous boundary is installed at both ends, and dynamic analyses are carried out changing the wave velocity of the viscous boundary, The result is compared with a result of a very long model corresponding to the solution with infinite length. A wave velocity is chosen so that the good performance of a viscous boundary is exhibited. The parametric analyses are carried out changing the model of various structural properties, and an approximation expression is suggested to obtain the wave velocity easily for setting a viscous boundary.