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열처리 온도 및 분위기에 따른 다공질 실리콘의 구조 및 광학적 특성
최현영,임광국,전수민,조민영,김군식,김민수,이동율,김진수,김종수,임재영,Choi, Hyun-Young,Yim, Kwang-Gug,Jeon, Su-Min,Cho, Min-Young,Kim, Ghun-Sik,Kim, Min-Su,Lee, Dong-Yul,Kim, Jin-Soo,Kim, Jong-Su,Leem, Jae-Young 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8
The porous Si (PS) was annealed at various temperature in air, argon, and nitrogen atmosphere. Structural and optical properties of the annealed PS were investigated by scanning electron microscopy (SEM) and photoluminescence (PL). It is found that the shape of pore is changed from circle to channel as increasing annealing temperature which was annealed in air and argon atmosphere. In case of PS annealed in nitrogen atmosphere, the shape of pore is changed from channel to circle with increase annealing temperature from 600 to $800^{\circ}C$. The PL peak position is blue-shifted with increasing annealing temperature. As annealing temperature increases, the PL intensity of the PS annealed in argon is decreased but that of the PS annealed in nitrogen is increased. It might be due to the formation of Si-N bonds and it passivates the non-radiative centers which is Si dangling bonds on the surface of the PS.
양극산화 시간 및 전류밀도 변화에 따른 다공질 실리콘의 특성 변화
최현영(Hyun Young Choi),김민수(Min Su Kim),김군식(Ghun Sik Kim),조민영(Min Young Cho),전수민(Su Min Jeon),임광국(Kwang Gug Yim),이동율(Dong-Yul Lee),김진수(Jin Soo Kim),김종수(Jong Su Kim),임재영(Jae-Young Leem) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.3
The PS(porous Si) were fabricated with different anodization time and current density. The structural and optical properties of PS were investigated by SEM(scanning electron microscopy), AFM(atomic force microscopy), and PL(photoluminescence). It is found that the pore size and surface roughness of PS are proportional to the current density. The PL spectra show that the PL peak position is red-shifted with increasing anodization time. This behavior corresponds to the change of pore size which is consistent with the quantum confinement model. The FWHM(full width at half maximum) of PL peak is decreased from 97 to 51 nm and the PL peak position is blue-shifted with increasing current density up to 10 ㎃/㎠. The PL peak intensity of the PS fabricated under 1 ㎃/㎠ is the highest among samples.
최현영(Hyun-Young Choi),홍지훈(Ji-Hun Hong),이완곤(Wan-Gon Lee),바트셀렘(Batselem Jagvaral),전명중(Myung-Joong Jeon),박현규(Hyun-Kyu Park),박영택(Young-Tack Park) 한국정보과학회 2018 정보과학회논문지 Vol.45 No.9
최근 웹 데이터를 기반으로 자동적으로 지식베이스를 구축하는 방법들이 연구되고 있지만, 웹데이지터의 불완전성으로 인해 일부 데이터가 누락되거나 다른 데이터와의 연결이 부족한 경우가 발생한다. 이러한 문제를 해결하기 위해 기존 연구들은 자연어 임베딩을 기반으로 인공 신경망을 통해 학습하는 방법들을 제안했다. 하지만 실제로 사용되는 많은 지식베이스의 경우 자연어 말뭉치가 존재하지 않아 엔티티 임베딩에 어려움이 있다. 따라서 본 논문에서는 이러한 문제점을 해결하기 위해 지식 베이스의 RDF 데이터를 문장 형태의 RDF-Sentence로 변환 후 임베딩에 사용하여 단어 벡터를 생성하고 신경망을 사용하는 지식 완성 기법을 제안한다. 본 논문에서는 제안하는 방법의 성능을 측정하기 위해 트리플 분류 실험을 진행했다. 기존 NTN 모델과 비교 실험을 수행하였고, 기존 연구보다 평균적으로 15% 높은 정확도를 얻었다. 또한, 한국어 최대 지식 베이스인 WiseKB 지식 베이스에 적용하여 88%의 정확도를 얻었다. In recent years, a number of studies have been conducted for the purpose of automatically building a knowledge base that is based on web data. However, due to the incomplete nature of web data, there can be missing data or a lack of connections among the data entities that are present. In order to solve this problem, recent studies have proposed methods that train a model to predict this missing data through an artificial neural network based on natural language embedding, but there is a drawback to embedding entities. In practice, natural language corpus is not present in many knowledge bases. Therefore, in this paper, we propose a knowledge completion method that converts the knowledge base of RDF data into an RDF-sentence and uses embedding to create word vectors. We conducted a triple classification experiment in order to measure the performance of the proposed method. The proposed method was then compared with existing NTN models, and on average, 15% accuracy was obtained. In addition, we obtained 88%accuracy by applying the proposed method to the Korean knowledge base known as WiseKB.
최현영(Hyun-Young Choi),한원(Won Han),조영호(Young-Ho Cho) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
본 논문에서는 폰 카메라 응용을 위해 H 형 비틀림 스프링으로 지지된 한 쌍의 사다리꼴 셔터 블레이드를 이용하는 초소형, 저전력, 고속 전자기력 Flapping 셔터를 제안한다. 기존의 정전기력 Rolling 셔터와 Flapping 셔터는 폰 카메라 응용을 위해 큰 입력 전압이 필요하며, 기존의 전자기력 Rotating 셔터는 큰 부피로 인해 폰 카메라에 사용하기 어렵다. 본 논문에서 제안하는 전자기력 Flapping 셔터는 폰 카메라에 사용 가능한 작은 크기로 회전구동을 위해 저강성 H 형 비틀림 스프링과 저관성 사다리꼴 블레이드로 설계하여 제작된다. 실험에서 전자기력 Flapping 셔터는 입력전류 60 ㎃ 에서 자기장 0.15 T 와 0.30 T 에 대하여 각각 최대 오버슈트 회전각 80.2±3.5°와 90.0±1.0°와, 정상 상태 회전각 48.8±1.4°와 64.4±1.0° 성능을 보인다. 응답 시간 성능에서는 셔터 개방의 경우, 1.0 ㎳/20.0 ㎳ 의 상승/정착 시간을 보이며, 셔터 폐쇄의 경우는 1.7 ㎳/10.3 ㎳ 의 하강/정착 시간을 보인다. 본 논문에서는 폰 카메라용 셔터 응용을 위해 제안하는 전자기력 Flapping 셔터의 초소형(~8×8×2 ㎣), 저전력(≤60 ㎃), 고속(~1/370 s) 성능을 실험적으로 검증하였다. In this study, we present small-size, low-power, and high-speed electromagnetic flapping shutters for phone cameras. These shutters are composed of trapezoidal twin blades suspended by H-type torsional springs. The existing electrostatic rolling and flapping shutters need high input voltage, while the existing electromagnetic rotating shutters are too big to be used for phone cameras. To achieve low-power and high-speed angle motion for small-size electromagnetic flapping shutters for camera phones, low-inertia trapezoidal twin blades, each suspended by the low-stiffness H-type torsional springs, are employed. The electromagnetic flapping shutters used in this experimental study have steady-state rotational angles of 48.8 ± 1.4° and 64.4 ± 1.0° in the magentic fields of 0.15 T and 0.30 T, respectively, for an input current of 60 ㎃; the maximum overshoot angles are 80.2 ± 3.5° and 90.0 ± 1.0° in the magentic fields of 0.15 T and 0.30 T, respectively. The rising/settling times of the shutter while opening are 1.0 ㎳/20.0 ㎳, while those while closing are 1.7 ㎳/10.3 ㎳. Thus, we experimentally demonstrated that the smallsize (~8 × 8 × 2 ㎣), low-power (≤ 60 ㎃), and high-speed (~1/370 s) electromagnetic flapping shutters are suitable for phone cameras.
공기흡입식 추진기관용 연료조절밸브시스템 개발에 관한 연구
이도윤,최현영,박종승,구자용,Lee, Do-Yun,Choi, Hyun-Young,Park, Jong-Seung,Koo, Ja-Yoeng 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.4
In this paper, we have proposed a fuel metering unit of ai breathing engine. The proposed valve system consists of a constant pressure drop valve and a metering valve, which are controlled by servovalve. We carried out nonlinear and linear analysis, computer simulation and experimentation to find effects of some factors on system performance. Analysis and experimental results show a good agreement. It is also shown that the system stability is affected by pressure drop of metering valve and inlet pressure of injectors.
김윤성,옥택근,신명철,최현영,문중범,김성은,서정열,안무업,조병렬,김용훈,이봉기,김명,조준휘,Kim, Yoon-Sung,Ohk, Taek-Gun,Shin, Myeung-Cheol,Choi, Hyun-Young,Moon, Joong-Bum,Kim, Sung-Eun,Seo, Jeong-Yeul,Ahn, Moo-Eob,Cho, Byung-Ryul,Kim, Yang 대한임상독성학회 2007 대한임상독성학회지 Vol.5 No.1
Glyphosate is the active ingredient in widely used herbicides. It acts through inhibition of the shikimate metabolic pathway in plants. This pathway does not exist in mammals, however, so glyphosate is presumably less toxic to humans. Nevertheless, fatal cases of glyphosate poisoning in humans have still occurred. Cases of glyphosate poisoning reported in the previous literature were almost always caused by intentional ingestion. Therefore, intramuscular injection of glyphosate with suicidal intent has not been reported. We report a case of 43-year-old man with poisoning due to intramuscular injection of glyphosate herbicide. He was admitted to the emergency department with a chilling sensation, local hotness, swelling, and tenderness at the site of glyphosate injection. He was treated with intravenous antibiotics and analgesics for 10 days and was discharged without any other complication.