• Title/Summary/Keyword: 피란

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Descriptive Perspective and Writing Method in Yeheon's Piranrok (여헌(旅軒) 장현광(張顯光)의 『피란록(避亂錄)』에 나타난 서술시각과 글쓰기 방식)

  • Chung, Woo-Bong
    • (The)Study of the Eastern Classic
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    • no.57
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    • pp.103-136
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    • 2014
  • This is the paper on the descriptive perspective and writing method in Yeheon(旅軒)'s Piranrok(避亂錄). Piranrok was Yeheon's diary which was written during Japanese invasions of Korea. Many intellectual recorded their diaries during the war. Yeheon's Piranrok was a typical example among war journals. I tried to take view of the descriptive perspective and writing method in Yeheon's Piranrok. First, sourceful introspection was distinct characteristic in the descriptive perspective. Yeheon penetrated into a chaotic state of affairs during Japanese invasions of Korea. And Yeheon had reflective consciousness about self-existence. He contemplated his existence through diary writing. I had a task to study the writing methods in Yeheon's diary. One of the distinct characteristic in writing methods was to increase specific gravity of discussion. Yeheon advocated strongly his opinion and position about cause of war, war responsibility, morality, fortification and righteous army. Yeheon made the best use of communication method and catechetic method. He answered his own questions about the enter and retirement of public office. He expressed his worry and conflict through various techniques of expression. I have a task to study the diary in Chosun dynasty. I believe that analyzing characteristics of Yeheon's diary can contribute to understanding the literature history of diaries in Chosun dynasty.

A Study on the Characteristics of Refuge Dwelling Area and Housing of Busan since Korea War (부산의 한국전쟁 피란민 주거지와 피란주택 특성)

  • Yoo, Jae-Woo;Kim, Jun;Song, Hye-Young;Hong, Ji-Wan
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.36 no.3
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    • pp.3-12
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    • 2020
  • The purpose of this study was to analyze the Characteristic and Changing Process of Refugees' Housing in the Korean War. Refugees' Housing is one of the unique forms of housing that emerged during the acute situation in the war. During the Korean War, Busan became the Wartime Capital and various housing policies were implemented for the influx of refugees. Various types of housing appeared in Busan during the war, and the type analysis and characteristic of these types were revealed through literature and case studies. Accordingly, the product of study was indicated in the meaning of the housing restoration policy enforced during the war and the housing type exhibited by refugees from the perspective of housing.

Multi-responsive hydrogel cross-linked synthesized spiropyran-based hydrophilic cross-linker (스피로피란 기반 친수성 가교제를 활용한 다중 자극 감응형 하이드로젤)

  • Jeong, Hye-Won;Kim, Sang Jin;Heo, Eun-Jin;Shin, Sung Gyu;Han, Sa Ra;Jeong, Jae Hyun
    • Journal of the Korean Applied Science and Technology
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    • v.38 no.1
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    • pp.126-135
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    • 2021
  • Stimuli-responsive hydrogels are being extensively studied to alter their physiochemical properties in response to external changes such as temperature, pH, light and mechanical stress. This study reports multi-responsive hydrogel having optical change response to external stress. First, we synthesized a novel spiropyran cross-linker successfully by grafting poly(ethylene glycol) diacrylate (PEGDA) on both side of spiropyran and introduced to hydrogel. In the results, the yellow spriopyran structure was conversed to purple merocyaine structure by internal stress during swelling of the hydrogels cross-linked with the SP-PEGDAs. Also, the hydrogel could be visualized the swelling and deswelling process in response to pH, by converting MC and prontonated MC structure.

Synthesis of N-Alkylcarbazole-3-Vinylene-2-Methyl-4-Dicyanomethylene-4H-Pyran (적색발광재료용 N-알킬카르바졸-3-비닐렌-2-메틸-4-디시아노메틸렌-4H-피란의 합성)

  • Chung, Pyung Jin;Sung, Jin Hee
    • Applied Chemistry for Engineering
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    • v.20 no.1
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    • pp.40-45
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    • 2009
  • N-Alkylcarbazole-3-vinylene-2-methyl-4-dicyanomethylene-4H-pyran derivatives were synthesized by dehydration, $S_N2$, Vilsmeier, and Knoevenagel condensation. They are red-emitting materials for organic light emitting device (OLED) composed of electron donor of N-alkylcabazole-3-vinylene groups and electron acceptor of 2-methyl-4-dicyanomethylene-4H-pyran groups by a conjugated structure. The structural properties of reaction products were analyzed FT-IR and $^1H-NMR$ spectroscopy. The thermal stabilities and reactivities were measured by melting points and yields. The UV-visibles and PL properties can be determined by exitation spectra and emission spectra, respectively.

Synthesis of 6-(10-Alkylphenothiazine-3-vinylene)-2-methyl-4-dicyanomethylene-4H-pyran (적색발광재료용 6-(10-알킬페노티아진-3-비닐렌)-2-메틸-4-디시아노메틸렌-4H-피란의 합성)

  • Chung, Pyung Jin;Sung, Jin Hee
    • Applied Chemistry for Engineering
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    • v.18 no.6
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    • pp.587-591
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    • 2007
  • 6-(10-Alkylphenothiazine-3-vinylene)-2-methyl-4-dicyanomethylene-4H-pyran derivatives were synthesized by Knoevenagel condensation. They are red-emitting materials for organic light emitting device (OLED) which composed of electron donor of 6-(10-Alkylphenothiazine-3-vinylene) groups and electron acceptor of -2-methyl-4-dicyanomethylene-4H-pyran groups by a conjugated structure. The structural properties of reaction products were analyzed FT-IR and $^1H-NMR$ spectroscopy. The thermal stabilities and reactivities were measured by melting points and yields. The UV-visibles and PL properties can be determined by exitation spectra and emission spectra, respectively.

Pyran and Pyridine as Building Blocks in Heterocyclic Synthesis (이중고리 합성에 블록제로서 이용된 피란과 피리딘)

  • El-Hashash, Maher.A.;El-Sawy, Abdallah.A.;Eissa, Abdelmonem.M.F.
    • Journal of the Korean Chemical Society
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    • v.53 no.3
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    • pp.308-324
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    • 2009
  • The present work is devoted to study the interaction of $\beta$-aroylacrylic acid derivative (3) with malononitrile in (DMF) in the presence of piperidine and/or ammonium acetate, then using the formed compounds as starting materials for synthesizing fused and isolated heterocyclic systems. It has been established that the $\beta$-aroylacrylic acid (3) reacts with malononitrile in (DMF) in the presence of piperidine as a catalyst with the formation of 4H-pyran derivative (4). By changing the catalyst into ammonium acetate, pyridine derivative (5) has been obtained. Also the N-maleamic acid derivatives (19) and (27) have been synthesized via the interaction of (4) and (5) with maleic anhydride. The purpose of this step is to study the behavior of the formed maleamic acid derivatives – as analogies of $\beta$-aroylacrylic acids – towards different active methylene compounds under Michael addition reaction.

News&News

  • Korea Crop Protection Association
    • Life and Agrochemicals
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    • v.27 no.3 s.216
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    • pp.60-63
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    • 2006
  • FMC코리아∙신영아그로∙아진케미칼, 본회 준회원 가입/ 신임 한국잔류농약연구회장에 김용환씨 선출/ 동부한농화학, 「동부한농」으로 사명 변경/ 바이엘, 「바스타」글로벌 경쟁대회 수상 영예/ 바이엘, 「영업 정책 설명회 및 인센티브 시상식」개최/ 바이엘, 제품상담 위한 대표 전화번호 개설/ 동부한농, 진딧물약「세티스」본격 출시/ 경농, 신제품「모스피란 입제」출시/ 신젠타, 2006신제품 출시회 성료/ 신젠타, 이삭 주요병해 전문약제「킬트」출시/ 바스프∙스미토모화학, 각각 사무실 이전

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Synthesis of 3,4-Dihydro-2H-Pyran derivatives Utilizing Ag2CO3/Celite (Ag2CO3/Celite를 이용한 3,4-다이하이드로-2H-피란 유도체들의 합성)

  • Kim, Byung-So
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.4
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    • pp.331-336
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    • 2006
  • An efficient synthesis of 3,4-dihydro-2H-pyrans is achieved by $Ag_2CO_3$/celite mediated reaction of 1,3-dicarbonyl compounds with vinyl ether in moderate yields. This method has been applied to the synthesis of 3,4-dihydro-2H-pyranochromens and 3,4-dihydro-2H-benzochromen. 3,4-Dihydro-2H-pyranochromens were easily converted to 4H-pyranochromens by elimination of ethoxy group. The structures of these compound were identified by IR and $^1H$ NMR-Spectra.

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Photochromic Spiropyran-Functionalized Organic-Inorganic Hybrid Mesoporous Silica for Optochemical Gas Sensing (광화학적 가스 센싱을 위한 광변색 스피로피란 개질된 유기-무기 하이브리드 메조포러스 실리카)

  • Park, Sung Soo;Ha, Chang-Sik
    • Journal of Adhesion and Interface
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    • v.17 no.4
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    • pp.141-148
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    • 2016
  • In this work, mesoporous silica (SBA-15) was synthesized via self-assembly process using triblock copolymer ($PEO_{20}PPO_{70}PEO_{20}$, P123) as template and tetraethyl orthosilicate (TEOS) as silica source under acidic condition. SBA-15 have high surface area ($704m^2g^{-1}$) and uniform pore size (8.4 nm) with well-ordered hexagonal mesostructure. Spiropyran-functionalized SBA-15 (Spiropyran-SBA-15) was synthesized via post-synthesis process using 3-(triethoxysilyl)propyl isocyanate (TESPI) and 1-(2-Hydroxyethyl)-3,3-dimethy-lindolino-6'-nitrobenzopyrylo-spiran (HDINS). Spiropyran-SBA-15 was produced with hexagonal array of mesopores without damage of mesostructre. Surface area and pore size of Spiropyran-SBA-15 were $651m^2g^{-1}$ and 8.0 nm, respectively. Optochemical properties of Spiropyran-SBA-15 was studied with chemical vapors such as EtOH, THF, $CHCl_3$, Acetone and HCl. Main peaks of photofluorescence of Spiropyran-SBA-15 exhibited blue shift in the range of 603.4~592.1 nm after exposure under EtOH, THF, $CHCl_3$, and Acetone vapors. Normalized peak intensities decreased in the range of 0.8~0.3. The main peak of photofluorescence of Spiropyran-SBA-15 showed significant blue shift of 592.1 nm after exposure under HCl vapor, while normalized peak intensity decreased to 0.1.

Photochromic Properties of Cellulose Derivatives Having Spirobenzopyran Group (스피로벤조피란을 포함하는 셀룰로오스 유도체의 광변색 특성)

  • Xiangdan, Li;Kim, Eun-Kyoung;Lee, Myong-Hoon
    • Polymer(Korea)
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    • v.29 no.1
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    • pp.25-31
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    • 2005
  • Cellulose acetate derivatives containing 6-(p-hexyloxyphenyl)carbonyl spirobenzopyran (CA-COSP) were prepared from base-catalyzed etherification of cellulose acetate, and their physical and photochromic properties were characterized. The degree of substitution of COSP was calculated from the amount of residual hydroxyl groups in cellulose acetate measured by the $^1H$-NMR and UV spectrometric data. It was ranging from 0.87 to 45.5% depending on the reaction condition. UV/vis spectrometry of the resulting CA-COSP revealed that the polymer shows a reversible color change by changing its color from colorless to blue upon UV irradiation forming a merocyanine structure, and returning back again to colorless spiropyran structure by visible light or by heat. The rate of color change was faster in solution than in the film. In the more polar solvent, the more stable was the resulting merocyanine, and the slower was the rate of reverse reaction to spiropyran. Compared to COSP blended with cellulose acetate, in which a phase separation was observed for samples containing more than 0.9 wt% of COSP, up to 48 wt% of COSP could be blended in CA-COSP without phase separation.