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Integer programming approach to the convergence adjustment of deflection yoke
Kang, Donghan,Park, Sungsoo,Lee, Hyohyung,Hong, Cheol-Kee 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(1)
We consider the adjustment of convergence of Deflection Yoke (DY) in Color Display Tube (CDT). Convergence is a measure of how well the red, green and blue beams are physically aligned with each other to strike the same area of the screen. When convergence mismatch (called misconvergence) happens, one way of compensating it is to attach several ferrite sheets on the interior surface of DY. Since the misconvergence results from magnetic field generated abnormally and it has linearity property, the effects of ferrite sheets can be added also. Under this property, we suggest an optimization model of misconvergence compensation process and test it with random 81 DY samples. As a result, more than 90% of the samples could be made to satisfy the required convergence criteria.
Kang, Donghan,Kim, Keugtae,Jang, Youngho,Moon, Heecheon,Ju, Dongjin,Kwon, Gyutae,Jahng, Deokjin Elsevier 2018 International biodeterioration & biodegradation Vol.135 No.-
<P><B>Abstract</B></P> <P>Since few studies have investigated the nitrification and assimilation of nitrogens by algal-bacterial consortia, this study aimed to evaluate the effects of supplementary aeration and blue light on nitrogen removal and biomass growth of algal-bacterial consortia in real domestic wastewater. When blue light was weakly irradiated (500 μmol m<SUP>−2</SUP> s<SUP>−1</SUP>), it was found that supplementary aeration enhanced ammonia removal from 38.5% to 96.3% and algal growth from 72.5 mg algae L<SUP>−1</SUP> to 345.3 mg algae L<SUP>−1</SUP> by providing oxygen for nitrification and inorganic carbon for photosynthesis of microalgae. It was also observed that ammonia was consumed first and then nitrate produced by nitrification was assimilated, indicating that diauxic growth of consortia on nitrogen sources occurred. Thus, it was expected that nitrogen removal could be enhanced by lowering nitrification and denitrification loads. Moreover, intense blue light was found to accumulate nitrite by selective photoinhibition of nitrite oxidizing bacteria (NOB) of which c-type cytochrome is known to be photo-bleachable at 408 nm. From these results, it was concluded that favorable conditions for growth and nitrogen removal by algal-bacterial consortia in real wastewater could be established by controlling aeration and light intensity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In low-light condition, aeration enhanced algal biomass and nitrogen removal. </LI> <LI> Diauxic growth of algal cells on nitrogen species was observed. </LI> <LI> Blue light inhibited nitrite oxidation to nitrate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
헤드램프 내부의 습기발생 원인분석 및 습기발생 재현 연구
류동한(Donghan Ryu),강병도(Byungdo Kang),조현덕(Hyundeog Cho),용부중(Boojoong Yong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A variety of automobile headlamps appears along with the development of automobile design technologies. It is often difficult for complicatedly designed headlamps to satisfy the required performance for night driving. Condensation phenomenon occurred inside headlamps results in damaging a reflector and/or photometric performance. This study analyzes the condensation phenomenon experimentally for further development of headlamps.
비음수 행렬 분해와 학습 벡터 양자화를 이용한 얼굴 인식
진동한(Donghan Jin),강현철(Hyunchul Kang) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.3
비음수 행렬 분해 기법(non-negative matrix factorization)은 대표적인 부분 영역 기반 표현 기법의 하나로 영상의 부분적인 특징을 나타내는 기저 벡터의 선형 조합으로 영상을 표현하는 기법이다. 본 논문에서는 여러 가지 비음수 행렬 분해 기법을 이용하여 얼굴 영상을 표현하고, 추출된 특징을 기반으로 학습 벡터 양자화를 이용하여 얼굴 인식을 수행하였다. 추출된 각 기법의 기저 벡터를 비교하여 각 기법의 특징을 분석하였다. 또한 NMF 기법들의 인식율 검증을 통해 비음수 행렬 기법의 얼굴 인식에 대한 활용 가능성을 확인하였다. Non-negative matrix factorization (NMF) is one of the typical parts-based representation in which images are expressed as a linear combination of basis vectors that show the lcoal features or objects in the images. In this paper, we represent face images using various NMF methods and recognize their face identities based on extracted features using a learning vector quantization. We analyzed the various NMF methods by comparing extracted basis vectors. Also we confirmed the availability of NMF to the face recognition by verification of recognition rate of the various NMF methods.
김동한(Donghan Kim),강수혁(Soo-Hyeok Kang),이은진(Eun-Jin Lee),고국원(Kuk Won Ko),남상엽(Sang Yep Nam) 大韓電子工學會 2009 電子工學會論文誌 IE (Industry electronics) Vol.46 No.3
본 논문에서는 Limit-cycle 항법의 안정성을 분석하고 path follwer를 제안한다. Limit-cycle 항법은 2차 비선형함수의 특징을 이용하며, 빠른 이동로봇의 움직임을 제어하기 위해 제안되어졌다. Limit-cycle의 수렴반경과 방향을 조절하여 충돌 없이 장애물을 회피하고, 목표점에 도달할 수 있다. 하지만 지금까지 Limit-cycle 항법의 안정성은 연구되어지지 않았다. 따라서 본 논문에서는 이러한 안정성을 분석하고, Limit-cycle 항법을 로봇축구에 적용하여, 시뮬레이션과 실제 실험에서 제안된 방법을 검증한다. Because the stability of obstacle avoidance ability is important for the safe operation of mobile robots, this paper deals with the analysis of dynamic stability of Limit-cycle navigation method that was proposed by authors. Limit-cycle navigation method is fast and easy to implement for fast moving mobile robots using limit-cycle characteristics of the 2nd-order nonlinear function. It can be applied to robots in dynamically changing environment such as the robot soccer. By adjusting the radius of the motion circle and the direction of the obstacle avoidance, the mobile robot can avoid the collision with obstacles and move to the destination point. The stability of Limit-cycle navigation method is analyzed with a linear model. To demonstrate the effectiveness and applicability, it is applied to the robot soccer. Simulations and real experiments ascertain the merits of the proposed method.