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Kim, Daeok,Kim, Dae Woo,Lim, Hyung-Kyu,Jeon, Jiwon,Kim, Hyungjun,Jung, Hee-Tae,Lee, Huen The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.41
<P>Porous materials have provided us unprecedented opportunities to develop emerging technologies such as molecular storage systems and separation mechanisms. Pores have also been used as supports to contain gas hydrates for the application in gas treatments. Necessarily, an exact understanding of the properties of gas hydrates in confining pores is important. Here, we investigated the formation of CO<SUB>2</SUB>, CH<SUB>4</SUB> and N<SUB>2</SUB> hydrates in non-interlamellar voids in graphene oxide (GO), and their thermodynamic behaviors. For that, low temperature XRD and <I>P</I>–<I>T</I> traces were conducted to analyze the water structure and confirm hydrate formation, respectively, in GO after its exposure to gaseous molecules. Confinement and strong interaction of water with the hydrophilic surface of graphene oxide reduce water activity, which leads to the inhibited phase behavior of gas hydrates.</P> <P>Graphic Abstract</P><P>Structural changes of water confined in graphene oxide to gas hydrates were investigated using low temperature XRD. It was revealed that the phase equilibrium points of gas hydrates strongly inhibited due to the surrounding nano-sized voids and the hydrophilic surface of graphene oxide. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp03263b'> </P>
윤대옥 ( Daeok Youn ),장세영 ( Seyeong Jang ) 충북대학교 과학교육연구소 2016 과학교육연구논총 Vol.31 No.2
Wind blowing across the ocean surface generates most ocean waves along an interface between air and water. As the waves approach the shore, the waves break in the surf zone near the seashore. Focussed on the natural phenomenon of breaking waves, a laboratory ocean wave experiment is designed to help students understand physical changes of a ocean wave even in a small classroom. A long water tank filled with water and plastic waterproof panels to generate water waves are needed to carry out the experiment. While students conduct various experimental works like generating and observing waves, they can efficiently understand concepts related to ocean waves such as the classification of waves, types of breaking waves, the movement of water particles and even how to make waves properly. We here present an experiment design with the principle of ocean waves as a teaching material.
Kim, Daeok,Ahn, Yun-Ho,Lee, Huen American Chemical Society 2015 Journal of chemical and engineering data Vol.60 No.7
<P>The formation of gas hydrates in porous media is expected to bring out beneficial properties for gas storage and separation. Appropriate combined use of both gas hydrate and highly porous metal organic frameworks (MOFs) can be useful for achieving advances in the field of gas storage and separation. This makes understanding the behavior of gas hydrates in the confining pores of MOF crucial. The formation and phase equilibria of CO<SUB>2</SUB> and CH<SUB>4</SUB> hydrates in MOF were investigated using MIL-53 MOF through low-temperature synchrotron high-resolution powder diffraction (HRPD) and <I>P</I>–<I>T</I> traces. MIL-53 has both intrinsic micropores and intergranular meso/macropores. Gas hydrate forms in meso/macropores, and its thermodynamic behavior is relatively inhibited compared to its behavior in bulk phase due to reduced water activity. However, a strong CO<SUB>2</SUB> dissolution appeared instead of gas hydrates in the intrinsic micropores of MIL-53. This led to a notable phenomenon in which the cooling and heating lines in the <I>P</I>–<I>T</I> trace curves of CO<SUB>2</SUB> hydrate did not intersect near the dissociation point of CO<SUB>2</SUB> hydrate.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jceaax/2015/jceaax.2015.60.issue-7/acs.jced.5b00322/production/images/medium/je-2015-00322y_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/je5b00322'>ACS Electronic Supporting Info</A></P>
Intercalation of Gas Molecules in Graphene Oxide Interlayer: The Role of Water
Kim, Daeok,Kim, Dae Woo,Lim, Hyung-Kyu,Jeon, Jiwon,Kim, Hyungjun,Jung, Hee-Tae,Lee, Huen American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.20
<P>Intercalation phenomena of gas molecules in the interlayer of graphene oxide have been investigated using CO<SUB>2</SUB>, CH<SUB>4</SUB>, H<SUB>2</SUB>, and N<SUB>2</SUB> gases. Intercalation of gas molecules is highly affected by the affinity between the hydrophilic surface of GO and target molecules. Among tested gases, CO<SUB>2</SUB> can only be intercalated. Furthermore, the swelling of interlayer changed the intercalation phenomena. Amounts of intercalated gases are significantly enhanced, and all the gases can be intercalated by retarded dynamics of intercalated water.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-20/jp5026762/production/images/medium/jp-2014-026762_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5026762'>ACS Electronic Supporting Info</A></P>
비제약적 환경에서 얼굴 주요위치 특징 서술자 기반의 얼굴인식
김대옥(Daeok Kim),홍종광(Jongkwang Hong),변혜란(Hyeran Byun) 한국정보과학회 2014 정보과학회논문지 Vol.41 No.9
본 논문에서는 비제약적 얼굴 데이터 베이스를 위한 확장성 있는 얼굴 인식 방법을 연구하고, 간단한 실험 결과를 소개한다. 기존의 얼굴 인식 연구들은 주로 조명, 얼굴 각도, 표정, 배경 등 제약이 있는 환경에서의 정확도 향상에 초점을 맞추고 있어서 비제약적 얼굴 데이터 베이스에 사용하기에 적합하지 않다. 제안하는 얼굴인식 방법은 비제약적 얼굴 인식을 위한 특징 추출 알고리즘으로, 먼저 지역적 특징이 존재하는 눈, 코, 입과 같이 얼굴의 중요한 특징을 나타내는 영역을 분리한다. 각 얼굴 주요 위치는 고차원의 다중 스케일 국부 이진패턴 히스토그램(Multi-scale LBP histogram) 특징 벡터로 기술된다. 단일 얼굴 주요 위치에 해당하는 다중 스케일 국부 이진패턴 히스토그램 특징 벡터는 주성분 분석법(PCA: Principal Component Analysis)과 선형 판별 분석법(LDA: Linear Discriminant Analysis)의 차원 축소과정을 통해 저차원 얼굴 특징 벡터를 생성한다. 저차원 얼굴 특징 벡터는 랭크 획득과 Precision at k(p@k) 성능 평가 방법을 이용하여 제안한 알고리즘의 얼굴 인식 성능을 검증한다. 본 연구는 FERET, LFW 및 PubFig83 데이터 베이스를 이용하여 얼굴 인식 실험을 수행하였으며, 제안한 알고리즘을 이용한 얼굴 인식 방법이 기존의 방법보다 향상된 인식성능을 보였다. This paper proposes a scalable face recognition method for unconstrained face databases, and shows a simple experimental result. Existing face recognition research usually has focused on improving the recognition rate in a constrained environment where illumination, face alignment, facial expression, and background is controlled. Therefore, it cannot be applied in unconstrained face databases. The proposed system is face feature extraction algorithm for unconstrained face recognition. First of all, we extract the area that represent the important features(landmarks) in the face, like the eyes, nose, and mouth. Each landmark is represented by a high-dimensional LBP(Local Binary Pattern) histogram feature vector. The multi-scale LBP histogram vector corresponding to a single landmark, becomes a low-dimensional face feature vector through the feature reduction process, PCA(Principal Component Analysis) and LDA(Linear Discriminant Analysis). We use the Rank acquisition method and Precision at k(p@k) performance verification method for verifying the face recognition performance of the low-dimensional face feature by the proposed algorithm. To generate the experimental results of face recognition we used the FERET, LFW and PubFig83 database. The face recognition system using the proposed algorithm showed a better classification performance over the existing methods.