연구발표논문초록 ( 전달현상 (Ⅱ) ) : 젖은 벽탑을 통한 산소전달에 관한 연구

이승용,도갑수 (정) ( Seung Yong Lee,Kap Soo Doh ) 한국화학공학회 1983 추계총회초록집 Vol.- No.-

西州 曺夏望의 삶과 시세계에 관한 일고찰

이승용(Lee Seung yong) 대동한문학회 2017 大東漢文學 Vol.51 No.-

曺夏望(1682~1747)은 조선후기 少論에 속하는 인물로, 본관은 昌寧, 자는 雅仲, 호는 西州이다. 老·少論간의 黨爭이 가장 치열했던 景宗과 英祖시기에 관직에 진출하였지만, 당쟁에는 크게 관여하지 않았다. 서울에 거주할 때는 詩社를 결성하여 모임에 참여하기도 하였으나, 생애의 대부분을 외직을 떠돌며 유람과 詩文으로 보냈다. 耳溪 洪良浩(1724~1802)에 의하면 그는 經史에 밝고 詩賦에 뛰어났다. 그러나 세속에 얽매이지 않는 기질과 강직한 성품, 그리고 少論이라는 黨色으로 인해 크게 현달하지는 못했다. 조하망의 문학적 성취와 관련하여 가장 잘 알려진 것은 鏡浦臺와 관련된 작품이다. 1741년에 江陵府使로 부임하여 경포대를 중수하고 <鏡浦臺上樑文>을 지었는데, 이 작품은 당시에 膾炙되었다. 李裕元(1814~1888)은 林下筆記 에서 경포대와 관련한 역대 작가들의 뛰어난 詩를 소개하면서 조하망이 지은 <鏡浦臺>를 꼽았다. 그럼에도 불구하고 지금까지 조하망과 그의 詩文에 대한 관심은 적었으며, 본격적인 연구는 이루어지지 않았다. 이 논문에서는 이러한 사실에 주목하여 18세기 소론 文人인 조하망의 家系와 生涯 및 西州集 의 편찬과 詩篇의 구성에 대해 상세히 고찰하고, 특히 ｢模擬錄｣에 실린 擬作詩를 중심으로 작품의 성격과 특징을 살폈다. ｢모의록｣에 실린 시의 특징적인 면모는 車天輅의 樂府新聲 에 수록되어 있는 古樂府와 거의 일치하는 양상을 보인다. 첫째는 學唐風의 낭만성을 지향하는 작품이 주를 이루는 점, 둘째는 여성 정감이 돋보이는 艶情詩가 다수라는 점, 셋째는 7언 절구의 형식이 대부분이라는 점이다. 요약하자면, ｢모의록｣을 통해 살펴본 조하망은 前代 學唐風의 낭만성을 지향했던 시인들과 그들의 작품을 비판적 시각으로만 바라보지 않았다. 그는 비판적 시각을 견지하면서도 이전 시대의 문학적 전통을 적극적으로 수용하여 唐詩風의 선집류를 학습하고 여기에서 시의 재료를 취하여 唐詩의 시 취향과 특징을 습득하여 자기화의 과정으로 활용하였다. 이러한 詩認識과 學詩의 과정은 단순히 模擬에 그치지 않고, 그가 개성적이고 다양한 시 세계를 이루는 바탕이 되었다. 이 논문에서는 ｢모의록｣에 실린 의작시만을 대상으로 하였기 때문에 조하망이 지향했던 낭만적 당시풍이 악부시가 아닌 다른 형식의 시에서는 어떠한 양상으로 드러나는지에 대해서는 살피지 못했다. 이와 관련하여 추후 ｢모의록｣을 제외한 나머지 13편의 ｢詩錄｣과 그 안에 보이는 조하망의 작가의식 및 작품의 주제적 측면에 대한 다각적 고찰은 조하망 시세계의 전모를 논하기 위해서도 꼭 필요하다. Jo Ha-mang(曺夏望, 1682~1747) is a person belonging to Soron line in the late Joseon Dynasty, and his family clan is Chang-nyeong, his courtesy name is Ajung, and his pen name is Seo-ju. He advanced into official positions during the time of Gyeongjong and Yeongjo when the party strife between Noron line and soron line was most intense, but he was not greatly involved in the party strife. When residing in Seoul, he formed a poetry society and participated in the meetings, but he spent most of his life on the sightseengs and poetry and prose wandering in the outside positions. According to Lee-gye Hong Ryang-ho(洪良浩, 1724~1802), he was brilliant in classics and historic records and excellent in poetry and poetic writings. However, it was not able to achieve great eminence due to his temperament not fettered by the secular world and the upright character and the party color of Soron line. What is the most well known in connection with the literary achievements of Jo Ha-mang is a work related to Gyeongpodae. In 1741, he was appointed as Mayor of Gangneung and repaired Gyeongpodae and wrote “Commemoration on Framing Completion of Gyeongpodae”, and this work was widely known to everybody at the time. Lee Yu-won(李裕元, 1814~1888) introduced the excellent poems of writers of all the times related to Gyeongpodae in “Notes of Retired Life”, and he chose “Gyeongpodae” written by Jo Ha-mang. Nevertheless, there has been little interest in Jo Ha-mang and his poetry, and no full-fledged research has been done. In this paper, paying attention to such facts, I considered in detail the family line of Jo Ha-mang, the literary persom of Soron line in the 18th century and his life, the compilation of “Collection of Seo-ju” and the composition of the book of poems, and, especially, examined the features and characters of the works, focusing on the imitation poetry in “Imitation- Record”. The characteristic appearance of poems in “Imitation-Record” shows the aspect that almost corresponds with old folk songs included in “New Voices of Folk Songs” by Cha Cheon-ro. The first is that the works are mainly oriented towards the romantic nature of the scholarly Tang style, the second is that the majority are love poems that stand out women s feelings, the third is that the majority are the forms of 7 characters phrases. To sum up, Jo Ha-mang examined through “Imitation-Record” did not look at poets and their works, which aimed at the romanticism of the previous scholarly Tang style, only from a critical point of view. While adhering to a critical viewpoint, by actively accepting the literary tradition of the previous era, he learned the anthologies in Tang poetry style, and by taking materials of poetry here and learning the taste and characteristics of Tang poetry, he utilized it as a process of assimilation. The process of these poetry recognition and learning poetry were not just imitation, but became the basis for forming a unique and diverse poetic world. In this paper, I focused only on imitation poetry included in “Imitation- Record”, so I could not examine in what aspect the romantic Tang poetry style which Jo Ha-mang oriented, appeared in the poetry of other forms, not of folk songs. In relation to this, further diverse studies on remaining 13 “Poetry Records” excluding “Imitation-Record” and the writer consciousness of Jo Ha-mang and the thematic aspects in them are also necessary to discuss the whole picture of the poetic world of Jo Ha-mang.

선박용 직류배전기술 동향

이승용,김성일,Lee, Seung-Yong,Kim, Seong-Il 전력전자학회 2022 전력전자학회지 Vol.27 No.4

RF 열플라즈마를 이용한 Y₂O₃:Eu³⁺ 적색 나노 형광체 분말 합성

이승용,구상만,황광택,김진호,한규성,Lee, Seung-Yong,Koo, Sang-Man,Hwang, Kwang-Taek,Kim, Jin-Ho,Han, Kyu-Sung 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.6

$Y_2O_3:Eu^{3+}$ is an excellent red-emitting phosphor, which has been widely used for display devices due to highly luminescent property and chemical stability. In this study, $Y_2O_3:Eu^{3+}$ red phosphors were prepared using the solid state reaction and RF thermal plasma synthesis. The particle size of $Y_2O_3:Eu^{3+}$ phosphors obtained by the solid state reaction varied from 10 to $20{\mu}m$, and 30~100 nanometer sized $Y_2O_3:Eu^{3+}$ particles were obtained from a liquid form of raw material through RF thermal plasma synthesis without an additional heat treatment. Photoluminescence measurements of the obtained $Y_2O_3:Eu^{3+}$ particles showed a red emission peak at 611 nm ($^5D_0{\rightarrow}^7F_2$). PL intensity of red nano phosphors prepared by RF thermal plasma synthesis was comparable to that of red phosphors prepared by the solid state reaction, indicating that nano-sized $Y_2O_3:Eu^{3+}$ red phosphors could be successfully synthesized using one-step process of RF thermal plasma. $Y_2O_3:Eu^{3+}$는 우수한 적색 발광 특성을 가지고 있는 형광체로 최근 고화질 디스플레이에 대한 수요가 증가함에 따라 관련 연구가 활발히 진행되고 있다. 본 연구에서는 RF 열플라즈마 합성법과 고상법을 이용하여 $Y_2O_3:Eu^{3+}$ 적색 형광체를 합성하였으며, 합성 방법에 따른 $Y_2O_3:Eu^{3+}$ 적색 형광체의 결정 구조, 미세 구조, 발광 특성의 차이를 XRD, TEM, PL 분석을 통해 비교하였다. 고상법으로 합성된 $Y_2O_3:Eu^{3+}$ 적색 형광체의 입자는 약 $10{\sim}20{\mu}m$ 크기를 가지는 반면, RF 열플라즈마 합성법을 통해 합성된 적색 형광체는 반응부는 약 100 nm, 필터부는 약 30 nm의 크기를 갖는 나노 형광체로 확인되었다. 합성된 모든 분말들은 PL 측정결과 611 nm($^5D_0{\rightarrow}^7F_2$)에서 발광하는 것을 확인하였으며, 결정 크기와 입도가 증가할수록 PL intensity가 증가하였다. 또한, 추가 열처리 공정이 필요 없는 one-step 공정의 RF 열플라즈마 공정을 통해 합성된 $Y_2O_3:Eu^{3+}$ 적색 나노 형광체는 고상법으로 합성된 적색 형광체와 비슷한 발광 특성을 보이는 것을 확인할 수 있었다.

페라이트-오스테나이트 2상역 온도에서 미량합금 원소가 첨가된 탄소강의 재결정 거동

이승용,김지연,황병철,Lee, Seung-Yong,Kim, Ji-Yeon,Hwang, Byoungchul 한국재료학회 2016 한국재료학회지 Vol.26 No.11

In this study, recrystallization behaviors in the two-phase (${\alpha}+{\gamma}$) region of micro-alloyed steels such as Base, Nb, TiNbV and CAlN were investigated in terms of flow stress, microstructure and associated grain boundary characteristics. The flow stress of all specimens reached peak stress and gradually decreased, which means that recrystallization or recovery of proeutectoid deformed ferrite and recovery or transformation to ferrite of deformed austenite occurred by thermal activation. The precipitation of carbide or nitride via the addition of micro-alloying elements, because it reduced prior austenite grain size upon austenitization, promoted transformation of austenite to ferrite and increased flow stress. The strain-induced precipitation under deformation in the two-phase region, on the other hand, increased the flow stress when the micro-alloying elements were dissolved during austenitization. The recrystallization of the Nb specimen was more effectively retarded than that of the TiNbV specimen during deformation in the two-phase region.

공학교육 만족도 지수에 기반한 전략연구

이승용,윤재용,김태현,손소영,Lee Seung-Yong,Yoon Jae-Yong,Kim Tae-Hyun,Sohn So-Young 한국공학교육학회 2005 공학교육연구 Vol.8 No.3

요즘 거론되는 이공계의 위기는 국가 경쟁력을 저해하는 중대한 문제이다. 본 연구에서는 이공계의 위기를 구체적으로 정량화하기 위해, 구조방정식모형을 이용하여 전공과 인성적 측면에서의 학생들의 공학교육 만족도 지수를 산출하였다. 도출된 지수를 바탕으로 공학 교육의 현 주소를 데이터 마이닝 기법을 활용하여 분석하고 그 결과를 토대로 공학 위기 극복을 위한 발전적 전략을 제시하였다. The crisis of science-engineering field is a significant problem which hinders the improvement of national competitiveness. In this study, we use a structural equation model to propose two kinds of satisfaction indices of engineering education: m index for major and p index for personality. They are used to improve the current situation of engineering education in Korea. Based on the resulting feedback information, we suggest several strategic plans for science-engineering field.

담배의 관능평가 중 오차 발생의 심리요인

이승용,Lee, Seung-Yong 한국연초학회 2010 한국연초학회지 Vol.32 No.2

고압 수소 가스 하 인장 시험을 이용한 두 오스테나이트계 고망간강의 수소취화 특성 평가

이승용,백운봉,남승훈,황병철,Lee, Seung-Yong,Baek, Un-Bong,Nam, Seung Hoon,Hwang, Byoungchul 한국재료학회 2016 한국재료학회지 Vol.26 No.7

The hydrogen embrittlement of two austenitic high-manganese steels was investigated using tensile testing under high-pressure gaseous hydrogen. The test results were compared with those of different kinds of austenitic alloys containing Ni, Mn, and N in terms of stress and ductility. It was found that the ultimate tensile stress and ductility were more remarkably decreased under high-pressure gaseous hydrogen than under high-pressure gaseous argon, unlike the yield stress. In the specimens tested under high-pressure gaseous hydrogen, transgranular fractures were usually observed together with intergranular cracking near the fracture surface, whereas in those samples tested under high-pressure gaseous argon, ductile fractures mostly occurred. The austenitic high-manganese steels showed a relatively lower resistance to hydrogen embrittlement than did those with larger amounts of Ni because the formation of deformation twins or microbands in austenitic high-manganese steels probably promoted planar slip, which is associated with localized deformation due to gaseous hydrogen.

페라이트-펄라이트 조직 아공석강의 상온 및 저온 충격 인성에 미치는 미세조직적 인자의 영향

이승용,정상우,황병철,Lee, Seung-Yong,Jeong, Sang-Woo,Hwang, Byoungchul 한국재료학회 2015 한국재료학회지 Vol.25 No.11

This paper presents a study on the room- and low-temperature impact toughness of hypoeutectoid steels with ferrite-pearlite structures. Six kinds of hypoeutectoid steel specimens were fabricated by varying the carbon content and austenitizing temperature to investigate the effect of microstructural factors such as pearlite volume fraction, interlamellar spacing, and cementite thickness on the impact toughness. The pearlite volume fraction usually increased with increasing carbon content and austenitizing temperature, while the pearlite interlamellar spacing and cementite thickness mostly decreased with increasing carbon content and austenitizing temperature. The 30C steel with medium pearlite volume fraction and higher manganese content, on the other hand, even though it had a higher volume fraction of pearlite than did the 20C steel, showed a better low-temperature toughness due to its having the lowest ductile-brittle transition temperature. This is because various microstructural factors in addition to the pearlite volume fraction largely affect the ductile-brittle transition temperature and low-temperature toughness of hypoeutectoid steels with ferrite-pearlite structure. In order to improve the room- and low-temperature impact toughness of hypoeutectoid steels with different ferrite-pearlite structures, therefore, more systematic studies are required to understand the effects of various microstructural factors on impact toughness, with a viewpoint of ductile-brittle transition temperature.

Comparative Smoke Analysis of CORESTA Monitoring Cigarettes

이승용,지상운,신해근,Lee, Seung-Yong,Ji, Sang-Un,Shin, Hea-Geun The Korean Society of Tobacco Science 2011 한국연초학회지 Vol.33 No.1

This experiment was conducted as a part of Asia collaborative study on purpose of verifying the difference between CM6 and CM7 including 3R4F for reference. It carried out using various analytical categories for example, main stream, sidestream and Av. smoke. Additional analysis such as physical properties, blending ratio, combustibility and general leaf component analysis also implemented in order to investigate the difference. We complied with ISO standard and CORESTA recommended method during analytical operating procedures. In this study, we described that comparative analytical result for CM6 and CM7 known as reference or monitoring cigarettes including 3R4F for reference. All sample cigarettes were conditioned at $22^{\circ}C$, 60% relative humidity for 48 hours. Av. Smoke, MS and SS smoke analysis were performed over five times with two smoking condition, ISO and Health Canada with the exception of Av. smoke analysis. We complied with ISO standard method during analytical operating procedures. And, we conducted additional analysis, such as physical properties, blending ratio, combustibility and leaf component analysis also in order to investigate the difference. In conclusion, we found out some differences between CORESTA monitoring cigarette No. 6 and No 7. The smoke components such as total particulate matters, NFDPM, nicotine and carbon monoxide contents of CM7 were a little lower than CM6. And, these phenomena were the same as not only main stream smoke but also side stream smoke and Av. smoke. This tendency was consistent with ISO and Health Canada smoking condition. Besides, leaf constituents' color of CM7 was darker than CM6. In case of combustibility, it showed short combustion time approximately 30 seconds.