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Hembram, K. P. S. S.,Jung, Hyun,Yeo, Byung Chul,Pai, Sung Jin,Kim, Seungchul,Lee, Kwang-Ryeol,Han, Sang Soo American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.27
<P>As opposed to the standard graphite anode used for lithium (Li) ion batteries (LIBs), a standard anode material for sodium (Na) ion batteries (NIBs) has not yet been reported. Black phosphorus is potentially very attractive as an anode material for NIBs, as it has a layered structure similar to graphite but a greater interlayer distance. In this work, we propose an atomistic mechanism for the sodiation of black phosphorus, based on first-principles calculations. The layered structure of black phosphorus is maintained up to the composition of Na<SUB>0.25</SUB>P, with <I>one-dimensional</I> sodiation (an intercalation process) occurring in the interlayer spaces of the black phosphorus, resulting in sliding of the phosphorene layers because one Na atom tends to bind to four P atoms. At Na levels beyond Na<SUB>0.25</SUB>P, the intercalation process changes to an alloying process. Sodiation exceeding the critical composition leads to breaking of P–P bonds and eventual formation of an amorphous phase from the layered Na<SUB><I>x</I></SUB>P structure. After the P–P bonds in the layered Na<SUB><I>x</I></SUB>P structure are broken, in a progress in which staggered P–P bonds are preferentially broken rather than planar P–P bonds, P<SUB>2</SUB> dumbbells are generated. As sodiation proceeds further, most of the P<SUB>2</SUB> dumbbells become isolated P atoms. Thus, in the amorphous Na<SUB>3</SUB>P phase, only low-coordinate P components such as isolated atoms (primarily) and dumbbells are found. We expect that our comprehensive understanding of the sodiation mechanism in black phosphorus will provide helpful guidelines in designing new types of black phosphorus anodes to obtain better performing NIBs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-27/acs.jpcc.5b05482/production/images/medium/jp-2015-054822_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b05482'>ACS Electronic Supporting Info</A></P>
임펄스 잡음 환경하에서 MO-FIR 필터링을 이용한 적응 시지연 추정
이진,전광석,여송필,김성환,Lee, J.,Jeon, K.S.,Yeo, S.P.,Kim, S.H. 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.3
본 연구에서는 충격잡음이 부가되는 비정상 신호 및 잡음 환경하에서 실시간 시지연 추정이 가능한 SLMPTDE와 ZFLMSTDE의 새로운 적응 시지연 추정 방법을 제안하였다. 본 연구에서 제안한 방법은 중간직교 척도를 바탕으로 임의의 SαS 확률과정에 강건하게 적용할 수 있도록 유도된 확률적 경사형적응 추정 알고리즘으로 구성되었으며, SαS 분포를 갖는 다양한 충격잡음을 대상으로 모의 실험하여 알고리즘의 통계적 수렴특성 및 우정 오차에 대해 분석하였으며, 기존의 LMSTDE 방법과 일정시지연의 경우와 시변시지연의 경우에 대해 실시간 시지연 추정능력을 비교, 분석하였다. 실험결과로부터, LMSTDE 방법은 α≥1.9인 가우시안 잡음에 대해서만 시지연 추정이 가능하였고 P=1로 설정한 SLMPTDE 방법은 1〈α≤2인 경우의 SαS 잡음에 대해 정확한 시지연 추정능력을 보였으며, ZFLMSTDE 방법은 0〈α≤2인 모든 경우의 잡음 환경에 대해 그 능력이 입증되었다.
여환진,여수동,이무상,배준웅,이우붕,이광필 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-
Concept of energy is introduced in the teaching quantitative relating of chemical reactions. The relations between the kind of matter and its mass are clarified in terms of energy of in calorie involved in the reaction. The heat quantity and strength of chemical bond are also explained by a model. Such an approach is able to give students deeper understanding of quantitative relation existing in chemical reactions.
6차 교육과정에 의거 개정된 8종의 중학교 1학년 교과서 중에서 녹는점 측정 실험의 비교 분석 및 개선
이무상,여수동,여환진,이우붕,배준웅,이광필,남상일,최윤정 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-
The purpose of this study is to comparatively analyze and improve the melting point experiment in the first grade middle school science textbooks on the basis of the 6th revised curriculum. From the results of the melting point experiment of paradichlorobenzene, we have found two problems on the measurement of melting point and have suggested the solution of these problems.
6차 교육과정에 따른 고등학교 화학II 교과서에서의 극성 및 무극성 분자의 전기적 성질 실험의 비교 분석 및 개선
여수동,이무상,여환진,이광필,이우붕,배준웅,천영숙 慶北大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.-
The purpose of this study is to comparatively analyze and improve the Electronic properties of Polar and Nonpolar Molecules in the High School Chemistry II Textbooks on the Basis of 6th Education Curriculum. From the results of Experiment about the Electronic properties of Polar and Nonpolar Molecules, we have found some problems and have suggested the solution of these problems.
이충길,이우붕,여환진,이광필,배준웅,이무상,여수동,정원우 慶北大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.-
The purpose of this study was to develop the PC program of learning aids by using three dimension molecular model for high school chemistry class. Specifically, this study developed instructional materials of molecular structure and crystall model using Virtual Reality modeling Language The developed program would be expected to be helpful for constructing image of molecular and crystal structure in high school students. Also, it may be useful for chemistry teachers who want to introduce molecular and crystal model into their classes.
Kim, H.J.,Lee, H.J.,Yang, J.H.,Yeo, I.S.,Yi, J.S.,Lee, I.W.,Lee, S.B.,Ryu, S.Y.,Kim, J.K.,Yang, P.S. American Society of Neuroradiology 2010 American journal of neuroradiology Vol.31 No.9
<P>Thromboembolic events related to CAS continue to be the main limitation to the widespread use of this technique as a first-line treatment for carotid occlusive disease. Our aim was to evaluate thromboembolism during CAS using DWI for catheterization techniques of the carotid artery.</P>
Hembram, K. P. S. S.,Jung, Hyun,Yeo, Byung Chul,Pai, Sung Jin,Lee, Heon Ju,Lee, Kwang-Ryeol,Han, Sang Soo The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.31
<P>Using first-principles calculations, we describe and compare atomistic lithiation, sodiation, and magnesiation processes in black phosphorous with a layered structure similar to graphite for Li-, Na-, and Mg-ion batteries because graphite is not considered to be an electrode material for Na- and Mg-ion batteries. The three processes are similar in that an intercalation mechanism occurs at low Li/Na/Mg concentrations, and then further insertion of Li/Na/Mg leads to a change from the intercalation mechanism to an alloying process. Li and Mg show a columnar intercalation mechanism and prefer to locate in different phosphorene layers, while Na shows a planar intercalation mechanism and preferentially localizes in the same layer. In addition, we compare the mechanical properties of black phosphorous during lithiation, sodiation, and magnesiation. Interestingly, lithiation and sodiation at high concentrations (Li2P and Na2P) lead to the softening of black phosphorous, whereas magnesiation shows a hardening phenomenon. In addition, the diffusion of Li/Na/Mg in black phosphorus during the intercalation process is an easy process along one-dimensional channels in black phosphorus with marginal energy barriers. The diffusion of Li has a lower energy barrier in black phosphorus than in graphite.</P>