입자 제거용 환기 필터의 설계 변수 선정 기법을 위한 이론 및 실험적 연구

정의경,노광철,박재홍,황정호 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.1

Pressure drop and particle removal efficiency of two commercial fibrous medium filters were measured with 20~1,000 nm sized aerosolized KCl particles. Pressure drop and particle removal efficiency were also theoretically predicted and the results qualitatively agreed with the experimental data. For this given particle removal efficiency, a filter design method for obtaining minimum pressure drop (and therefore minimum fan power) was suggested in this study by selecting solidity and fiber diameter as parameters. Therefore, by carrying out theoretical and experimental approaches together, this paper introduced a way of finding conditions for low pressure drop and high performance of a fibrous filter, especially if the filter would be used in mechanical ventilation system.

슈만의 파가니니《카프리스》 피아노 반주 작업에 담긴 의미

정의경 한국서양음악학회 2016 서양음악학 Vol.19 No.1

슈만이 세상을 떠나기 전 마지막으로 손을 대었던 음악작업은 파가니니 카프리스의 피아노 반주 작곡이었다. 파가니니는 슈만의 음악인생 시작점에도 결부되었던 작곡가로 슈만의음악인생 전반에 걸친 파가니니에 대한 애호를 단순히 그의 기교에 대한 매혹으로 보기에는모자람이 있었다. 또한 슈만의 정신상태, 장르의 문제, 단순한 화성화 작업 등으로 슈만의 마지막 음악작업을 의미없다 치부하기에는 그 이유들에 문제점이 존재하였다. 본 논문에서는슈만과 파가니니가 공유하는 특성인 다성성에 집중하여 평생에 걸친 슈만의 파가니니 흥미의 원인을 다양화시키고 슈만의 파가니니 카프리스의 반주 작업에 의미를 부여하였다. The last piece Schumann worked on before he died was the arrangement for Caprices by Paganini. Paganini was a composer with whom Schumann had been fascinated from the beginning of his musical career, and it would be oversimplifying to suggest that it was Paganini’s virtuosity that captured Schumann’s attention throughout his career. I suggest that it would be unfair to overlook the significance of Schumann’s last work based on the factors such as Schumann’s mental problems, the questions of genre, and the propensity for considering the accompaniment arrangement as a simple harmonization of a piece for solo work. In the present study, focusing on the shared interest of the two composers, namely multivocality, I reconsider Schumann’s lifelong fascination with Paganini and give meaning to Schumann’s piano accaompaniment to Paganini’s Caprices.

New application of layered silicates for carbon fiber reinforced carbon composites

정의경,이영석,Jinhoon Kim,Se Ho Cho,Jeong-il Kim,In-Sub Han 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2

To investigate potential use of a layered silicate, illite, for carbon fiber-reinforced (C/C) composites, the C/C composites were prepared at different carbonization temperatures, specifically 1000 8C and 1650 8C using illite. The physical and chemical changes in the prepared C/C composites that were induced by the addition of illite and anti-oxidation and mechanical properties of the composites were investigated. A carbothermal reaction occurred due to the addition of illite when the composite was prepared at 1650 8C,which resulted in the formation of SiC from the illite and carbon. The physical structures of the composites changed due to the increased interfacial adhesion between the reinforcing carbon fibers and the carbon matrix, which resulted increased bulk densities, and decreased porosities. The carbothermal reaction and physical structural changes that were induced by the addition of illite synergistically improved the anti-oxidation properties of the prepared composites, which were observed as a delay in oxidation. In addition, illite filler also improved flexural strength of the composite, due to the increased interfacial adhesion induced by illite addition. Therefore, the application of the layered silicate, illite, for C/C composites can be quite promising.

제20주제 – 자율주행차 어디까지?

정의경,장수은,이영인 서울대학교 환경대학원 2017 環境論叢 Vol.60 No.-

Role of surface fluorine in improving the electrochemical properties of Fe/MWCNT electrodes

정의경,정민정,이승걸,김형기,이영석 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-

In this study, we investigated the role of the surfacefluorine in carbon electrode materials in the energystorage of the corresponding electric double-layer capacitors (EDLCs). And in order to reach this goal, thehighly graphitic material multi-walled carbon nanotubes (MWCNTs) werefluorinated to minimize thechanges in the textural properties afterfluorination and the textural, surface chemical, andelectrochemical properties of the resulting MWCNTs were evaluated. Thefluorination of the MWCNTsdid not change their textural properties because of their highly graphitic properties. The surfacefluorinecontents of thefluorinated MWCNTs varied depending on thefluorination conditions. Theelectrochemical properties of thefluorinated MWCNT-based electrodes improved by 31.4–37.7%compared to those of the pristine MWCNTs, depending on the current-density load (0.2–1.5 A/g). Theincrease in the retained capacitance is due to the surfacefluorination of the MWCNTs. The role of thesurfacefluorine on the MWCNTs for the improved electrochemical properties of thefluorinated MWCNT-based electrodes is explained using a simple computational study. The surfacefluorine induces chargetransfer on the surface of the MWCNTs, resulting in a more nucleophilic surface that improves theinteraction between the surface of thefluorinated MWCNTs and H3O+.

《율리시즈의 귀향》에 대한 새로운 해석: ‘무’의 관념과 익명학회에 근거하여

정의경 한국서양음악학회 2010 서양음악학 Vol.13 No.3

몬테베르디의 오페라 《율리시즈의 귀향》은 《포페아의 대관식》의 그늘에 가려져 왔다. 상대적으로 의문의 여지가 없는 작품으로 인식되었던 《율리시즈의 귀향》의 주제는 두 주인공 율리시즈와 페넬로페의 사랑의 승리로 여겨졌다. 그러나 당시 전 유럽에서 유행했고《율리시즈의 귀향》의 대본가 바도아로가 속해 있던 익명학회도 애용했던 무의 관념에 의거하여 이 오페라를 해석하면 전혀 다른 일면을 보게 된다. 《율리시즈의 귀향》에서 언급하는 사랑은 두 주인공의 그것이 아니며 반대 축 인물들의 입을 통해 나오는 무로서의 사랑이다. 또한 대본과 총보의 차이라는 결과를 만들어 낸 대본가와 작곡가의 의견 차이의 원인 역시 무의 관념을 통해 밝혀낼 수 있다. 《율리시즈의 귀향》에 대한 이러한 시각의 해석은 그동안 《포페아의 대관식》에 비해 《율리시즈의 귀향》을 파악하기 쉬운 작품으로 받아들였던 기존의 해석을 뒤집고 더 나아가 《포페아의 대관식》에 대한 새로운 해석의 단서 또한 제공한다. Claudio Monteverdi's opera Il Ritorno d'Ulisse in patria, in comparison to his own L'incoronazione di Poppea, has not enjoyed much popularity in the musicological literature. It has generally been agreed, without much dispute, that the theme of Ulisse narrates the triumphant love story between Ulysses and Penelope. If one takes a look at the opera, however, with the concept of "nothingness," a popular concept not only prevalent throughout the Europe at the time, but more significantly, also advocated by the Accademia degli Incogniti, of which Giacomo Badoaro, the librettist of Ulisse, was a member, the other side of this seemingly happy story is revealed. The idea of "love" depicted in Ulisse is "Nothing" that comes from the mouth of the opposing characters (e.g., Penelope's suitors), not the one between Ulysses and his beloved. A curious discrepancy between the libretto and the score, most likely caused by the discrepancy between the librettist and the composer, can also be elucidated by the concept of nothingness. Such a view immediately challenges current scholarship in the literature that much less is there to be said about Ulysses than Poppea, and provides new evidence with which to look at the latter.

부모-자녀의 의사소통과 유아의 자아개념과의 관계

정의경,황해익 부산대학교 영유아보육연구소 2000 영유아보육연구 Vol.6 No.-

The purpose of this study was to investigate the difference between parents arts children communication, and to analyze the relationship between parents-child communication and the self-concept of young children. The subjects were 81 four-, and five-year-old kindergarten children, and their fathers and mothers. The research tools were the Self-Concept Inventory(1997), father-child/ mother-child communication inventory for parents, and the child-fathers child-mother communication questionnaire for children. The data were analyzed by t-test, paired t-test and Pearson's correlation coefficient. The results were as follows : First, in the positive communication, it showed a significant difference. The score of mother was higher than the father. The children were more positive than parents in the communication between them. Second, the children perceived parents-child communication more intensively than parents. Both in the positive and negative communication, the children recorded higher score than the parents. Third, the children's self-concept was more highly correlated with perceived children's communication than parents'. Thus, it can be inferred that parents and children perceived each other differently in the real communication. Therefore, it is necessary to make an activity to promote the perception about positive communication for the education of parents in the kindergarten. The result can be more valuable in the circumstance of real communication, so it is highly required far the systematic research of real communication.

포용도시를 위한 정부의 역할과 정책과제

정의경 대한지방행정공제회 2017 도시문제 Vol.52 No.582

Effects of physicochemical treatments of illite on the thermo-mechanical properties and thermal stability of illite/epoxy composites

정의경,이영석,Jae Won Lim,Kyeong-won Seo 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1

In this study, the effects of physicochemical treatments of illite on thermo-mechanical properties and thermal stability of the hybrid illite/epoxy composites were investigated. Illite was chemically modified with octadecylamine (ODA), to become more organophilic and also physically modified by wet ballmilling process, so that the illite dispersion in the epoxy matrix and interfacial adhesion between illite and epoxy resin could be improved. Then, as-received illite and physically and/or chemically modified illites were mixed with epoxy separately to produce hybrid illite/epoxy composites and their thermomechanical properties and thermal stability were investigated. Chemical modification was confirmed with FTIR and the aforementioned properties of illite/epoxy composites were characterized with SEM,DMA, and TGA. IR results show that ODA modification of illite was successful and thermo-mechanical properties were enhanced with illite introduction to the epoxy resin, especially when physically and chemically modified illite was added, showing about 100% increase in storage and loss modulus,compared to the pure epoxy. However, thermal stability was not enhanced by forming the illite/epoxy composites, because the composites prepared in this study were intercalated and flocculated illite/epoxy microcomposites.

함산소불소화 탄소재료의 응용

정의경,이영석 한국공업화학회 2011 한국공업화학회 연구논문 초록집 Vol.2011 No.-