긍정적 탐색을 활용한 성인대상 인성교육 프로그램 사례 연구

장경원(Chang, Kyungwon),곽윤정(Kwak, Yun Jung) 학습자중심교과교육학회 2016 학습자중심교과교육연구 Vol.16 No.4

본 연구는 긍정적 탐색(AI)을 활용하여 성인대상 인성교육 프로그램을 개발하고 실행한 사례 연구로서 경기도에 위치한 평생교육 기관의 드림코치 양성과정에 참여한 창의인성교육 강사 23명을 대상으로 바른 인성을 함양하기 위한 프로그램을 개발, 운영하였다. 긍정적 탐색을 활용한 성인대상 인성교육 프로그램은 참여한 사람들의 이야기를 기반으로 한 긍정변화 프로세스로 ‘긍정적인 질문’을 통해 변화를 이끌어 가며, 발견하기, 꿈꾸기, 디자인하기, 다짐하기 등의 네 단계로 진행되었다. 연구 결과, 긍정적 탐색을 활용한 성인대상 인성교육은 자신과 타인의 인성에 대해 탐색하고, 실천의 가치를 알게 하였고, 21세기형 인성을 개발하는데 적절한 프로그램으로서 활용 가능성이 높은 것으로 나타났다. 또한, 긍정적 탐색을 활용한 성인대상 인성교육 프로그램은 실천을 강조하는 인성교육의 지향점을 충족시킴으로써 구체적인 성인대상 인성교육의 내용 및 방법에 대한 기초를 마련할 수 있을 것이다. This research is a case study on application of appreciative inquiry(AI) for development and implementation of an adult character education program. 25 character education instructors participated in the Dream Coach development course provided by Gyeonggi-Do Provincial Institute for Lifelong Education, and developed and implemented a character education program for themselves. The adult character education program using AI was a positive change process based on discourse of the participants, and led change by asking positive questions and using four steps, Discover, Dream, Design, and Determine. It was found that the program enabled adults to explore character of self and others, and understand the value of practice. In addition, the program had potentials for developing characters for the 21st century, met the needs of character education by emphasizing practice, and established concrete, foundational contents and methods for adult character education.

상ㆍ하향채널 기반 CATV망을 위한 자동화 장치구현

조경원(Cho KyungWon),곽윤식(YoonSik Kwak) 한국정보기술학회 2003 Proceedings of KIIT Conference Vol.2003 No.-

본 논문은 CATV 망 관련 장치 구현에 관한 것으로 기존의 수동형 장치의 비효율성을 제거하기 위해 자동화된 집중식 Headend 시스템 및 분배장치를 구현하였다. 이를 위해 기존의 주파수대역 중에서 비디오 신호의 송신에 사용되지 않은 대역을 확보하고 이를 제어신호의 송ㆍ수신이 이루어지는 제어대역으로 사용하는 송수신 시스템 및 자동화 분배기를 설계하였으며, 상ㆍ하향통신 및 하향통신방식이 공유된 형태로 RS-232를 이용한 9600bps의 CATV 망을 위한 통합관리 시스템을 구현하였다. This study is about the development of a system related to the CATV network. It intends to develop an automatically centralized Headend system and a distributive system to remove the ineffectiveness of the established manual system. To achieve this goal, we took a part of bandwidth, which is not used for the transmission of video signals in the established frequency bandwidth, and used it for the transmission and receiver of controlling signals. By this way we could design a system of transmission and receiver and a automatic distributive system. We developed an information management system for the 9600bps CATV using RS-232 of forward/backward communication and backward communication.

Water Structure at the Lipid Multibilayer Surface: Anionic Versus Cationic Head Group Effects

Kundu, Achintya,Kwak, Kyungwon,Cho, Minhaeng American Chemical Society 2016 The Journal of physical chemistry B Vol.120 No.22

<P>Membrane water interface is a potential reaction site for many biochemical reactions. Therefore, a molecular level understanding of water structure and dynamics that strongly depend on the chemical structure of lipid is prerequisite for elucidating the role of water in biological reactions on membrane surface. Recently, we carried out femtosecond infrared pump probe studies of water structure and dynamics at multibilayer surfaces of zwitterionic phosphatidylcholine-analogue lipid (J. Phys. Chem. Lett. 2016, 7, 741). Here, to further elucidate the anionic and cationic headgroup effects on water, we study vibrational dynamics of water on lipid multibilayers formed by anionic phospho-glycerol lipid molecules as well as by cationic choline-derivatized lipid molecules. We observed two significantly different vibrational lifetime components (very fast 0.5 ps and slow 1.9 ps) of the OD stretch mode of HOD molecules at the negatively charged phospho-lipid multibilayer whereas only one vibrational lifetime component (1.6 ps) was observed at the positively charged choline-derivatized lipid multibilayer. From the detailed analyses about the vibrational energy and rotational relaxations of HOD molecules in lipid multibilayers composed of anionic lipid with phosphate and cationic lipid without phosphate, the role of phosphate group in structuring water molecules at phospholipid membrane interface is revealed.</P>

Disulfide bond influence on protein structural dynamics probed with 2D-IR vibrational echo spectroscopy.

Ishikawa, Haruto,Kim, Seongheun,Kwak, Kyungwon,Wakasugi, Keisuke,Fayer, Michael D National Academy of Sciences 2007 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.104 No.49

<P>Intramolecular disulfide bonds are understood to play a role in regulating protein stability and activity. Because disulfide bonds covalently link different components of a protein, they influence protein structure. However, the effects of disulfide bonds on fast (subpicosecond to approximately 100 ps) protein equilibrium structural fluctuations have not been characterized experimentally. Here, ultrafast 2D-IR vibrational echo spectroscopy is used to examine the constraints an intramolecular disulfide bond places on the structural fluctuations of the protein neuroglobin (Ngb). Ngb is a globin family protein found in vertebrate brains that binds oxygen reversibly. Like myoglobin (Mb), Ngb has the classical globin fold and key residues around the heme are conserved. Furthermore, the heme-ligated CO vibrational spectra of Mb (Mb-CO) and Ngb (Ngb-CO) are virtually identical. However, in contrast to Mb, human Ngb has an intramolecular disulfide bond that affects its oxygen affinity and protein stability. By using 2D-IR vibrational echo spectroscopy, we investigated the equilibrium protein dynamics of Ngb-CO by observing the CO spectral diffusion (time dependence of the 2D-IR line shapes) with and without the disulfide bond. Despite the similarity of the linear FTIR spectra of Ngb-CO with and without the disulfide bond, 2D-IR measurements reveal that the equilibrium sampling of different protein configurations is accelerated by disruption of the disulfide bond. The observations indicate that the intramolecular disulfide bond in Ngb acts as an inhibitor of fast protein dynamics even though eliminating it does not produce significant conformational change in the protein's structure.</P>

DFT Study on the U(IV)-PNPP Complex in Water

Keunhong Jeong,Wansik Cha,Kyungwon Kwak 한국방사성폐기물학회 2018 한국방사성폐기물학회 학술논문요약집 Vol.2018 No.05

Simulation Performance of IEEE 802.11p WAVE System in Small-Scale Fading Models

Jeongwook Seo,Younsung Lee,Hyunsik Kim,Kyungwon Park,Jaemin Kwak,Dongku Kim 한국통신학회 2008 한국통신학회 학술대회논문집 Vol.2008 No.11

Second-harmonic generating properties of polar noncentrosymmetric aluminoborate solid solutions, Al_5−<i>x</i>Ga_<i>x</i>BO₉ (0.0 ≤<i>x</i>≤ 0.5)

Shin, Yiseul,Lee, Dong Woo,Hong, Jongin,Kwak, Kyungwon,Ok, Kang Min The Royal Society of Chemistry 2012 Dalton transactions Vol.41 No.11

<P>A series of solid solutions of polar aluminoborate materials, Al<SUB>5−<I>x</I></SUB>Ga<SUB><I>x</I></SUB>BO<SUB>9</SUB> (0.0 ≤<I>x</I>≤ 0.5) have been synthesized by standard solid-state reactions using Al<SUB>2</SUB>O<SUB>3</SUB>, Ga<SUB>2</SUB>O<SUB>5</SUB>, and B(OH)<SUB>3</SUB> as reagents. The phase purities, crystal structures, and solid solution behavior of the reported materials have been investigated by powder X-ray diffraction. Solid solutions of Al<SUB>5−<I>x</I></SUB>Ga<SUB><I>x</I></SUB>BO<SUB>9</SUB> crystallize in the polar noncentrosymmetric space group, <I>Cmc</I>2<SUB>1</SUB>, with a three-dimensional structure consisting of distorted MO<SUB>4</SUB>, MO<SUB>5</SUB>, MO<SUB>6</SUB>, and BO<SUB>3</SUB> polyhedra (M = Al or Ga). Powder second-harmonic generating (SHG) measurements on the Al<SUB>5</SUB>BO<SUB>9</SUB> using 1064 nm radiation, indicate the material has a SHG efficiency of approximately 2 times that of α-SiO<SUB>2</SUB> and is not phase-matchable (type 1). Further nonlinear optical (NLO) measurements on the Al<SUB>5−<I>x</I></SUB>Ga<SUB><I>x</I></SUB>BO<SUB>9</SUB> solid solutions indicate a sharp increase in SHG efficiency up to 10 times that of α-SiO<SUB>2</SUB> for <I>x</I>≥ 0.4. Close structural examination suggests that the alignment of the asymmetric π-delocalization of BO<SUB>3</SUB> groups is responsible for the abrupt increase of SHG efficiency.</P> <P>Graphic Abstract</P><P>The structural origin for the SHG is attributable to the alignment of the π-delocalization of the BO<SUB>3</SUB> groups. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2dt11971d'> </P>

In-Situ Measurement of Vitamin C Content in Commercial Tablet Products by Terahertz Time-Domain

Kang, JuHee,Song, Jeonghun,Jung, Tae Sub,Kwak, Kyungwon,Chun, Hyang Sook Springer-Verlag 2018 Journal of infrared, millimeter and terahertz wave Vol.39 No.4

<P>Terahertz time-domain spectroscopy (THz-TDS) was applied to investigate the feasibility of in-situ measuring vitamin C content in commercial tablet products without any pretreatments. Characteristic absorption peaks of vitamin C were analyzed with quantum mechanical calculation to reveal the molecular origin of them. The peak appearing at 1.08 THz was then selected and tested for its suitability as a fingerprint signal for analyzing the vitamin C content in dietary supplement tablets. There are a couple of factors influencing THz absorbance other than concentration. Among those, the effects of tablet thickness and types of excipients in the tablet products were found to be significant, and were corrected with the calibration curve to determine vitamin C concentration in tablet forms. Furthermore, commercial tablet products in the market were analyzed using THz-TDS and the measured vitamin C contents were in good agreement with those determined using a reference method (high-performance liquid chromatography). Thus, our results suggest that THz-TDS can be used for the in-situ analysis of vitamin C in commercial tablet products.</P>

Isonitrile as an Ultrasensitive Infrared Reporter of Hydrogen-Bonding Structure and Dynamics

Maj, Micha,Ahn, Changwoo,Basiak, Bartosz,Kwak, Kyungwon,Han, Hogyu,Cho, Minhaeng American Chemical Society 2016 The Journal of physical chemistry B Vol.120 No.39

<P>Infrared (IR) probes based on terminally blocked beta-isocyanoalanine (AlaNC) and p-isocyanophenylalanine (PheNC) amino acids were synthesized. These isonitrile (NC)-derivatized compounds were extensively characterized by FTIR and femtosecond IR pump-probe spectroscopies, and a direct comparison was made with popularly used nitrile (CN)- and azide (N-3)-derivatized analogs. It is shown that the isonitrile stretch frequency exhibits extremely high sensitivity to hydrogen-bonding interactions. In addition, the IR intensity of the isonitrile group is much higher than that of the nitrile group and almost as intense as that of the azido group. Furthermore, its vibrational lifetime is much longer than that of the nitrile and azido groups. To elucidate the origin of such a high H-bond sensitivity and IR intensity observed for isonitrile, extensive quantum chemical calculations were performed. It is shown that the Coulombic contributions to the vibrational frequency shifts of the isonitrile and nitrile stretch modes have opposite signs but similar magnitudes, whereas the contributions of exchange repulsion and charge delocalization to their frequency shifts are comparable. Therefore, the isonitrile stretch frequency is much more sensitive to H-bonding interactions because the blue-shifting exchange-repulsion effects additionally enforced by such electrostatic effects. It is also shown that the much higher IR intensity of the isonitrile group compared to that of the nitrile group is due to the configuration reversal of the atomic electronegativity between the NC and CN groups. Owing to these features, we believe that isonitrile is a much better IR reporter of H-bonding structure and dynamics than the widely used nitrile and azide.</P>

Bis(oxalate)borate-containing electrolytes for high voltage electric double-layer capacitors: A comparative study

Nguyen, Hoai Van T.,Lee, Sanghee,Kwak, Kyungwon,Lee, Kyung-Koo Elsevier 2019 ELECTROCHIMICA ACTA Vol.321 No.-

<P><B>Abstract</B></P> <P>This study reports a systematic investigation of electrolytes based on new salts consisting of various cations and the bis(oxalate)borate (BOB) anion for use in electrical double layer capacitors. The quaternary ammonium salts—tetraethylammonium tetrafluoroborate (TEABF<SUB>4</SUB>), spiro-(1,1ʹ)-bipyrrolidinium tetrafluoroborate (SBPBF<SUB>4</SUB>), 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF<SUB>4</SUB>), tetraethylammonium bis(oxalato)borate (TEABOB), spiro-(1,1ʹ)-bipyrrolidinium bis(oxalato)borate (SBPBOB), and 1,1-dimethylpyrrolidinium bis(oxalato)borate (DMPBOB)—were successfully prepared in high purity and dissolved in acetonitrile (ACN) at a concentration of 1.0 M. The successful synthesis of the salts was confirmed by nuclear magnetic resonance, ultraviolet–visible, and Fourier-transform infrared spectroscopies. The physicochemical properties and electrochemical performance of the prepared electrolytes, namely, thermal stability, ionic conductivity, viscosity, electrochemical stability window, specific capacitance, and durability, were investigated. Compared to the BF<SUB>4</SUB>-containing electrolytes, the new electrolytes based on the BOB anion, particularly the DMPBOB salt, showed dramatically enhanced high-voltage performance at elevated temperature. Electrical double layer capacitors based on 1 M DMPBOB in ACN exhibited a capacitance retention of 55.9% and a coulombic efficiency of >99% after 2000 cycles at a working voltage of 4.0 V and 45 °C. Moreover, X-ray photoelectron spectroscopy suggested that a highly stable protective layer induced by the BOB-containing electrolyte was formed on the negative electrode of the capacitor, inhibiting acute electrolyte decomposition during the cycling test.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The salts TEABOB, SBPBOB and DMPBOB were synthesized in high purity. </LI> <LI> BF<SUB>4</SUB> and BOB-based salts in acetonitrile were used as electrolytes and compared. </LI> <LI> The BOB-based electrolytes formed a protective layer on the negative electrode. </LI> <LI> DMPBOB in acetonitrile exhibited the highest cycling stability at 4.0 V. </LI> </UL> </P>