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J. Y. Lee(이지연),H. C. Shim(심형철),S. M. Hyun(현승민),M. S. Oh(오민섭),S.-J. Jeon(전성재),S. H. Jeong(정수환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
As the electric-vehicle market grows, the massive efforts have been tried to develop materials with high capacity and high power for lithium ion secondary batteries. Sn-based anode materials are highly promising due to high theoretical specific capacity (994 mAh/g) as well as high power density for its excellent electrical conductivity. However, the use of Sn has been limited by the delamination from the current collector and degradation in structural stability due to the large volumetric change of ~257% during lithiation and delithiation process. To solve this problem, many studies have been attempted to alleviate volume expansion by inserting Sn particles into a soft carbon matrix, but it has been considered difficult to mass-produce due to the complicated manufacturing process. In this work, graphene/Sn composite material was prepared by a laser processing followed by RF magnetron sputtering. Porous graphene structure was rapidly fabricated using a laser irradiation, and Sn layer was deposited on the graphene by sputtering. This simple and fast manufacturing techniques helps to produce graphene/Sn composites without complicated process, and can also be easily adaptable to mass production. The resulting graphene/Sn composite-based anode exhibited a high capacity of 430 mAh/g at 2C and stable cyclability over 700 cycles at
이지연(G.Y.Lee),손건석(G.S.Son),김대중(D.J.Kim),이용래(Y.R.Lee),이귀영(K.Y.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Twelve samples from field-aged catalyst were investigated. The conversion performance was measured in a model gas test. The samples taken from the inlet side of the monolith were more deactivated than the corresponding ones from the outlet. However, samples taken from peripheral positions always showed better performance than samples originating from the center. In order to explain observed variations in activity the total surface area(B.E.T) and poisoning of each sample(EDS) were examined. It was concluded that thermal deactivation was mainly responsible for the difference between peripheral and central position while the poisoning due to S, Pb and P had the largest effect on the inlet samples.<br/>
Nanofibrillation of Silk Fibroin and its Application to Piezo Sensor through Structural Molding
J. Y. Lee(이지연),C. Kim(김철생),C. H. Park(박찬희) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Most of the nanofiber-based piezo sensors are still manufactured based on synthetic polymers. When it is implanted in the human body for application as a biosensor, limitations such as cytotoxicity and permanent retention are inevitably revealed. Therefore, we fabricated a silk fibroin-based nanofiber membrane that can act as a sensor remain only for a set period of time in vivo without cytotoxicity. Unlike synthetic polymers, the manufacturing process of nanofibers using natural proteins, silk fibroin, is complicated and difficult, and the physical properties are considerably weak. Accordingly, we have solved the problems that have been raised in the past by molding the protein structure to beta-sheet. The beta-sheet structure created through the treatment process not only strengthened the piezo effect but also increased its physical properties. This shows the potential as a biosensor that can be inserted into the human body in various areas and is expected to increase patient convenience.
이지연 ( J. Y. Lee ) 부산대학교 영화연구소 2011 아시아영화연구 Vol.4 No.2
특정한 영화적 사조로서의 뉴웨이브(new wave)는 특정한 시기에 사회적, 혹은 영화적 성찰 속에서 나타난 일군의 영화와 감독들을 일컫는다. 이 글은 이러한 뉴웨이브의 형성을 국제적인 관계 - 혹은 초국적인 제도적 공간과 담론 - 이라는 외연적 차원으로 확장시켜서 고려할 때, 그 외연적 차원을 통과해 나타난 현대 중국 영화의 어떤 경향을 추적해보고자 한다. 중국의 제5세대라는 이름 - 뉴웨이브로서의 레이블 - 의 형성과 정착 과정은 이러한 외연적 차원에서 뉴웨이브의 등장과 성장, 혹은 그 변화를 추적하는 것이 유의미함을 보여준다. 1990년대 중반부터 국제 영화 씬에서는 제5세대 다음의 새로운 세대의 중국 감독들의 출현을 갈망했고, 이에 대한 대답으로, 장 유안, 지아장커, 로우 예, 왕 샤오솨이, 허 지엔 준, 장 밍 등의 감독들이 제6세대라는 레이블 하에 ``발견``된다. 그러나 이들 감독들의 그 이후의 변화와 선회를 돌아볼 때, 과연 중국의 제6세대를 중국의 제5세대와의 단절속에서 나타난 뉴 뉴웨이브로 보는 것이 타당했는가, 그리고 이들과 동시대적 혹은 2000년대 초반 이후 나타나기 시작한 새로운 중국 영화의 경향들과의 연관과 단절성 속에서 제6세대라는 레이블이 얼마나 유의미한가 하는 질문을 던지게 한다. 지난 십여 년간의 중국 독립 영화의 성장은 제6세대란 좁은 틀을 깨고 뉴 웨이브라는 개념 자체를 넘어서는 현대 중국 영화의 폭발적 성장과 확장이라는 새로운 영화적 시기를 보여주고 있다고 생각된다. 이 새로운 경향을 6세대라는 레이블을 해체한다는 의미에서, 그리고 디지털 영화 제작과 밀접한 연관을 갖는다는 의미에서, D-6세대라 부르는 편이 적절할 듯하다. This essay intends to map out a certain tendency of contemporary Chinese cinema while it proposes to explore the extent to which the appearance of a new wave cinema movement is intertwined with the international sphere of transnational institutional space and discourse. The Chinese Fifth Generation, as seen as a label for the Chinese new wave cinema movement, corroborates such thesis that the emergence and development of a new wave cinema movement is closely tied to such international sphere. Since the mid-1990s, the international film scene had been eager to witness the appearance of new generation of Chinese film directors after the Fifth Generation. In conjunction with such anticipation, Zhang Yuan, Jia Zhangke, Lou Ye, Wang Xiaoshuai, He Jianjun and Zhang Ming were ``discovered`` under the label of the Sixth Generation directors. However, it seems vital to cast questions about the validity of considering the Chinese Sixth Generation as another new wave - distinguished from the Fifth Generation. In the last decade, the development of Chinese independent cinema surpassed the limited labeling rhetoric of new wave as well as of the Sixth Generation. This essay suggests that the new era of contemporary Chinese independent cinema can be labeled as D-6 generation as it dismantles the label of the 6th Generation; and its development was inconceivable without digital film production.
파라퀴논 유도체와의 전하이동착물 형성을 이용한 에녹사신 정량
이지연(J. Y. Lee),김동오(D. O. Kim),남수자(S. J. Nam),정문모(M. M. Jung),허문회(M. H. Hur),안문규(M. K. Ahn) 대한약학회 1999 약학회지 Vol.43 No.4
Enoxacin[1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-1,8-naphthyridine-3-carboxylic acid, ENX is a new quinolone antibacterial agent. The method is based on the highly colored charge-transfer complex formation of this drug as a pi-electron donor with 7,7,8,8-tetracyanoquinodimethane(TCNQ) or chloranil(CL) as pi-acceptors. The colored products were measured spectrophotometrically at 842nm and 552nm for TCNQ and CL, respectively. The different experimental conditions are optimized. The linearities for TCNQ and CL were 1.6mcg/mL~32mcg/mL and 6.4mcg/mL~160mcg/mL, respectively and colors were produced in non-aqueous media. This report describes a simple and rapid method for the analysis of enoxacin.