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- 저자 : 이세종(Se-Jong Lee) (검색결과 59 건)
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생체모방 액츄에이터용 다중탄소나노튜브/고분자 나노복합체
이세종,이득용,이명현,김배연,Lee, Se-Jong,Lee, Deuk-Yong,Lee, Myung-Hyun,Kim, Bae-Yeon 한국결정성장학회 2005 한국결정성장학회지 Vol.15 No.3
부드럽지만 큰 변위를 발생시키는 생체모방 액츄에이터는 관심의 대상이 되어왔다. 특히, 듀폰사의 나피온 고분자는 작은 전기장하에서도 큰 변위를 나타내었다. 전기기계적 특성을 향상시키기 위하여 탄소나노튜브/고분자 나노복합체를 제조하였다. 다중 탄소나노튜브/나피온 나노복합체를 캐스팅법으로 제조하고 탄소나노튜브 첨가량에$(0{\sim}7wt%)$ 따른 나노복합체의 전기기계적 특성을 조사하였다. 탄소나노튜브가 첨가된 나노복합체는 탄소나노튜브가 없는 고분자 액츄에이터와 비교하여 우수한 탄성계수와 응력이 관찰되었다. 다중 탄소나노튜브의 첨가는 고기능성 생체모방 액츄에이터 특성을 증진시키는데 효과적이었다. Biomimetic actuators that can produce soft-actuation but large force capability are of interest. Nafion, an effective ionomeric material from DuPont, has been shown to produce large deformation under low electric fields (<10V/mm). Carbon nanotube/polymer nanocomposites were cast to enhance the electromechanical properties of the composites. Multiwalled carbon nanotube (M-CNT)/Nafion nanocomposites were prepared by a solution casting to investigate the effect of M-CNT loading in the range of 0 to 7 wt% on electromechanical properties of the M-CNT/Nafion nanocomposites. The measured elastic modulus and actuation force of the M-CNT/Nafion nanocomposites are drastically different, showing larger elastic modulus and improved electromechanical coupling, from the one without M-CNT.
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이세종,Lee, Se-Jong 한국결정성장학회 2007 韓國結晶成長學會誌 Vol.17 No.1
[ $TiO_2/PVP$ ] 나노섬유의 배열을 증진시키기 위하여 콜렉터 접지방법을 변화시키면서 전기방사하였다. 한축방향의 배열을 가진 섬유를 만들기 위하여 두개의 전도성 기판을 콜렉터로 사용하여 전기방사하였다. 또한, 두축방향의 섬유배열을 하기 위하여 $90^{\circ}$ 각도로 배치된 콜렉터를 타이머로 조절하면서 방사하였다. 전기방사 시 나노섬유는 콜렉터 전극사이에서 전기장 효과에 의해 퍼지는 현상이 관찰되었다. 실험결과, 후자의 $TiO_2/PVP$ 나노섬유 경우 콜렉터에 정체된 전하의 해소로 인하여 방향성에 더 효과적이었다. [ $TiO_2/PVP$ ] nanofibers were electrospun by varying the collector grounding design to improve the axial alignment of fibers. The collectors are composed of two pieces of conductive substrates separated by a gap f3r the uniaxial alignment of fibers (X design). The collectors consisting of two sets of substrates placed by $90^{\circ}$ (XY design) equipped with a timer are also prepared for biaxial alignment of fibers. Both collectors show that the charged nanofibers are stretched to span across the gap between the electrodes. Experimental results reveal that the latter collector is more effective on the directionality of electrospun $TiO_2/PVP$ nanofibers due to the dissipation of accumulated electric charge between the collectors.
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은이 피복된 단심 Bi(2223) 초전도 선재에 대한 SrZrO<sub>3</sub> 코팅층의 접착강도 특성
이세종,예경환,이득용,송요승,Lee, Se-Jong,Ye, Kyung-Hwan,Lee, Deuk-Yong,Song, Yo-Seung 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.10
은이 피복된 Bi(2223) 단심 초전도 선재에 절연층으로 $SrZrO_3$ 피막을 졸-겔과 딥-코팅법으로 제조하여 $SrZrO_3$ 코팅층과 초전도 선재간 접착력 특성을 조사하였다. 실험인자로는 출발원료의 몰비, 유기화합물 첨가량, 건조온도 및 시간, 열처리 온도 및 시간이었으며 다구찌법의 망대특성과 $L_18(2^1{\times}3^7)$ 직교배열표를 이용하여 코팅층의 최적조건인 인자와 수준 조합의 최적화를 접착강도를 측정하여 분석하였다. 최적의 접착 특성을 가진 코팅조건은 Sr/Zr의 몰비가 0.3/0.7, 유기화합물 첨가량이 5wt%, 건조온도 및 시간은 160${\circ}C$ 10분, 열처리 온도 및 시간은 500${\circ}C$ 20분이었다. 분산분석 결과, 유의수준이 ${\alpha}$=0.1인 통계적으로 90% 신뢰공정이었다. Bond strength of $SrZrO_3$ resistive oxide barrier on Ag sheathed Bi(2223) tapes prepared by the sol-gel and dip-coating method was evaluated with an aid of Taguchi method and $L_18(2^1{\times}3^7)$ orthogonal arrays to determine the optimal process combination of levels of factors that best satisfy the bigger is better quality characteristic. The observed optimal condition is as follows: Sr/Zr mol ratio(0.3/0.7), amount of organic vehicle(5 wt%), drying temperature and time(160${\circ}C$, 10 min), heat treatment temperature and time(500${\circ}C$, 20 min), respectively. ANOVA analysis suggested that the influence of the factors within ${\alpha}$=0.1 was significant with a 90% confidence level.
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2011년 F/W 여성복컬렉션에서 나타난 과장형 재킷의 디테일별 분석
이세종 ( Se Jong Lee ),곽태기 ( Tai Gi Kwak ) 한국패션디자인학회 2011 한국패션디자인학회지 Vol.11 No.3
Exaggeration generally means expansion of materials that goes out of their own form. Its lexical definition is expressing excessively a thing or situation. Exaggeration in dressing usually means exaggeration of silhouette -- in other words, a dress with lines and silhouette that are expanded or more excessively expressed than the body. In the past, collars, shoulders, sleeves and skirts were often emphasized as a symbol of social status. Women`s dress was especially more luxurious and splendid and uncomfortable to wear for those of a higher social status. The lower the social status, the more comfortable clothes were to wear due to the simple form. This was true in both the East and the West. Exaggeration in modern times is used as an instrument to express one`s beauty and own personality rather than to show social status. And today, it is important to wear a dress in concordance with the trend. How and why the exaggerating factors are different in the past and present was analyzed in this study through investigation of references and women`s fashion collections of 2011. The influences of exaggerated dress considering social circumstance and mentality were also researched. Exaggeration of hourglass silhouette was very common after the Renaissance Period, where the silhouette served as a way of showing wealth and social class. However, we currently live in an egalitarian society without social classes. Therefore observations for the present day included exaggerations with various materials, colors and details, combining trends and one`s own personality, and no expression of social status through silhouette.
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