• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.11a
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• pp.160-161
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• 2021

To prepare polyurethane coatings for top coatings of automobiles, acrylic resins containing 75% of solids were synthesized by a radical polymerization. The viscosity of the acrylic resins was increased with increasing OH values. Crosslinked acrylic-urethane clear coatings were obtained by curing reaction between the synthesized acrylic resins and hexamethylene diisocyanate(HDI) trimer(Desmodur N-3600). The physical properties from the following studies were carried out : viscosity(Zahn cup #2), adhesion, pensil hardness, and 60° specular gloss. Various properties of the acrylic-urethane clear coatings as top coatings of mobile coat were evaluated on the coating specimens. Adhesion property to a substrate, 60° specular gloss, and pencil hardness of prepared paint showed quite good properties.

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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• v.9
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• pp.129-151
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• 2004

In der vorliegenden Arbeit wird versucht, sowohl die Gemeinsamkeiten bzw. $\"{A}hnlichkeiten$ als auch Verschiedenheiten der deutschen und koreanischen Phrasologismen festzustellen, wobei die interkultuellen Unterschiede der beiden Sprachgemeinschaften besonders $ber\"{u}cksichtigt$ werden sollen. Dabei wird von den deutschen Phraseologismen ausgegengen und es werden die Entspechungen in den koreanischen gesucht. Die $Entsprechungsm\"{o}glickeiten$ lassen sich wie folgl feststellen: 1) Gemeinsamkeiten von deutschen und koreanischen Phraseologismen (Auge um Auge, Zahn um Zahn; Augen zudrucken) 2) Entspechung von deutschen Phrasologismen und koreanischen Einzellexemen (Grund und Boden; Knall und Fall) 3) Interpretation deutscher Phraseologismen in koreanische Sprache (in Fleisch un Blut $\"{u}bergehen$; eine $H\"{a}nde$ $w\"{a}scht$ die andere) $\"{A}hnlichkeiten$ bzw. Gemeinsamkeiten bestehen vor allem in den Phraseologismen, deren gemeinsame Quelle auf die $\"{U}bernahme$ desselben Kulturgut wie die Antike, die Bibel und die Weltliteratur $zur\"{u}ckzuf\"{u}hren$ ist. Die $\"{A}hnlichkeiten$ zeigen sich auch bei den vielen somatischen Phraseologismen der beiden Sprachen, da manche somatischen Bezeichnungen die gleichen Symbolwerte haben. Hingegen beruhen Verschiedenheiten vorwiegend auf den interkulturellen Unterschieden der beiden Sprachgemeinschaften, die sich historisch­gesellschaftlich unterschiedlich entwickeln und keine Gemeinsamkeiten in Sitten und $Volksbr\"{a}uchen$ haben. Insbesonders bei den phraseologischen Vergleichen kommen viele Tierbezeichnungen als Einheit der Phraseologismen vor, die sich einander stark unterscheiden (dt. arbeiten wie ein Pferd $\to$ kr. arbeiten wie ein Rind; dt. wie Hund und Katze leben $\to$ kr. wie Hund und Affe leben). Die Zwillingsformeln der deutschen Phraseolgismen sind im Koreanischen als Einzellexem oder durch die Redupulikation $auszudr\"{u}cken$(Haus und Hof; klipp und klar; mit $H\"{a}ngen$ und $W\"{u}rgen$). Einige Redewendungen und $Sprichw\"{o}rter$ im Deutschen entsprechen den aus 4-Buchstaben bestehenden Redewendungen im Koreanischen, die aus der chinesischen Kultur stammen(viele Hunde sind des Hasen rod; Gelegenheit macht Diebe). Es sind naturlich manche Redewendungen bzw. $Sprichw\"{o}rter$, deren unterschiedliche Ausdrucksweisen auf die interkulturellen Verschiedenheiten $zur\"{u}ckzuf\"{u}hren$ sind (die $W\"{a}nde$ haben Ohren; der Apfel $f\"{a}llt$ nicht weit vom Stamm)

• Korean Association for Visual Culture
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• v.16
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• pp.131-161
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• 2010

This thesis investigates the cultural meanings of the first optical instrument, Camera obscura, in the pre-modern age, while it explains the development as well as the use of the Camera obscura in Europe and Korea. For this purpose the thesis traces the significant phases of the historical developments of the Camera obscura from L. da Vinci, G. B. della Porta, D. Barbaro, A. Kircher to J. Zahn etc. The Camera obscura was not only the symbolic instrument of the modernism in the sense that human being wanted to observe the outer world by himself and to be freed from the viewpoint of the christianity, but also was the forerunner of the modern visual culture, because it first time reproduced the artificial image of the natural world. Since the second half of the 17th century the box-type reflex Camera obscura had been produced, it began to be used as aid to drawing for painters like J. Vermeer, A. Canaletto and J. Reynolds etc. throughout Europe. It tells the evidence of the close relation between art and technology in the pre-modern age. Around the end of the 18th century the Camera obscura was brought to Korea, the closed country of the Fareast, by the scholars of the so-called 'Realist school' (Silhak-pa) who went to Beijing to acquire knowledges on the Western science from the European priests. In 1780s Yak-yong JUNG, one of the representative scholars of the Realist school, experimented the Camera obscura, and then, it was used for sketches of higher aristocrats' portraits by the supreme portrait painter of that time, Myoung-ki LEE. Those were possible only under the reign of the culturally liberal and reformative King, Jung-jo (ruled 1776-1800), and after his retreatment the inquiry of the Camera obscura had been dimished. It is not a historical coincidence that the Camera obscura could be examined and used in the period of the Enlightment both in Europe and Korea.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.31-33
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• 2005

GPS및 PDA의 발달로 인해서 위치 기반 서비스(LBS), 차량항법장치(CNS), 지리정보시스템(GIS)등 공간 데이터를 다루는 응용프로그램들이 급속하게 보급되었다. 이러한 응용프로그램은 높이 균등 색인 기법을 사용하여 원하는 데이터에 대한 색인을 제공하였다. 그러나 모든 공간 객체는 서로 상이한 접근 빈도를 가지고 있음에도 불구하고 기존의 공간색인 기법은 접근 빈도를 고려하지 못하는 단점을 가지고 있었다. 또한 기존의 빈도수만을 고려한 공간 객체의 색인 방법은 접근 빈도에 따른 편향성(skewed)은 제공하지만 공간 객체에 대한 지역성을 반영하지 못한다. 본 논문에서는 밀집되어 있는 공간 객체의 접근 빈도를 반영해서 편향된 색인 트리를 생성하는 기법을 제안한다. 이형 클러스터링으로 분포되어 있는 전체 영역에 대해서 Zahn의 클러스터링 알고리즘을 변형시켜서 다단계 세부영역을 구분한다. 이렇게 구간된 세부영역에 대해서 거리적 인접성과 접근 빈도수의 합을 이용해서 색인 트리를 생성한다. 다단계로 구성된 전체영역에 대해서 하향식 방식으로 편향된 색인 트리를 생성함으로써, 접근 빈도가 높은 공간 객체에 대해서 빠른 탐색이 가능하게 한다.

• Journal of the Korean Applied Science and Technology
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• v.38 no.2
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• pp.476-487
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• 2021

To prepare acrylic resin coatings containing 70% of solids, we used n-butyl methacrylate(BMA), methyl methacrylate(MMA), 2-hydroxyethyl methacrylate(2-HEMA), and acetoacetoxyethyl acrylate(AAEA), caprolactone acrylate(CLA) as raw materials, the glass transition temperature(T_g) of acrylic copolymer was adjusted around 50 ℃. The viscosity and molecular weight of the acrylic resins was increased with increasing OH values. Di-tert-amyl peroxide was found to be the suitable initiator to get high-solids acrylic resins. The optimum reaction conditions found in the study are 5 wt% of initiator, 4 wt% of chain transfer agent, 4 hrs of dropping time, and 140 ℃ of reaction temperature. The structure of the synthesized resins were characterized by FT-IR and ¹H-NMR spectroscopy. Number average molecular weight of 1900~2600 and molecular wight distribution of 1.4~2.1 were obtained. Crosslinked acrylic urethane clear coatings were obtained by curing reaction between the synthesized acrylic resins and hexamethylene diisocyanate trimer(Desmodur N-3300), the equivalent ratio of NCO/OH was 1.2/1.0. The physical properties from the following studies were carried out: viscosity(Zahn cup #2), adhesion, drying time, pot-life, pensil hardness, and 60° specular gloss. Various properties of the acrylic urethane clear coatings were also evaluated on the coating specimens. Adhesion property to a substrate, drying time, pot-life, pencil hardness, and 60° specular gloss of prepared paint showed quite good properties. Futhermore, prepared paint containing 10% of CLA showed quite good properties for adhesion, low viscosity and high hardness.