BaO-B₂O₃-SiO₂-K₂O-xTiO₂ Glass의 첨가에 의한BaNd₂Ti₅O₁₄-Glass 복합체의 마이크로파 유전특성

김동은,이성민,김형태,김형순,Kim, Dong-Eun,Lee, Sung-Min,Kim, Hyung-Tae,Kim, Hyung-Sun 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.2

The effects of $TiO_2$ in the glasses on the shrinkage and dielectric properties of BNT-glass composites have been investigated. Without $TiO_2$ addition, BNT-glass composite showed two humps in the shrinkage curve, which are related with crystallization of $BaTi(BO_3)_2\;and\;Bi_4Ti_3O_{12}$. However, the increase of $TiO_2$ addition resulted in the decrease of 2nd hump in the shrinkage. The increased dielectric constant with $TiO_2$ addition might be due to the reduced crystallization of $Bi_4Ti_3O_{12}$. A dielectric constant of 52, a quality factor of 5088 GHz, and a temperature coefficient of resonant frequency of $-0.16ppm/^{\circ}C$ were obtained for a specimen containing $TiO_2$-added glasses, without sacrificing the benefits of high ${\varepsilon}_r$ and low TCF of BNT ceramics.

거풍지보단(祛風至寶丹)의 혈관이완 효능과 기전에 관한 연구

김동은,박동완,정승현,신길조,이원철,한성호,Kim, Dong-Eun,Park, Dong-Wan,Jeong, Sung-Hyun,Shin, Gil-Cho,Lee, Won-Chul,Han, Sung-Ho 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.2

Objectives : This study was conducted to evaluate the effect and mechanism of Geupoongjibo-dan's relaxation of the tension of the blood vessel caused by Phenylephrine and KCI. Methods : In order to study the effect of Geupoongjibo-dan's relaxation of the blood vessel tension, Geupoongjibo-dan extract was infused into Phenylephrine and KCI-induced contracted rabbit aorta strips. To analyze the mechanism of Geupoongjibo-dan's effect on the blood vessel, Geupoongjibo-dan extract infused into Phenylephrine and KCI-induced contracted strips induced by agonists after treatment of N${\omega}$-nitro-L-arginine, Methylene Blue. Results : 1. Geupoongjibo-dan was very effective in relaxing the blood vessels contracted by Phenylephrine. 2. Geupoongjibo-dan was effective against Phenylephrine, than against KCI. 3. Geupoongjibo-dan's more relaxation effect on a blood vessel was terminated by N${\omega}$-nitro-L-arginine and methylene treatment. Conclusion : THis study showed that Geupoongjibo-dan's relaxation effect on a blood vessel is irrelevant to ${\alpha}$-adrenalin receptor, and it relaxes contracted vessels through cGMP channel.

전 세계 자연재해 추이 및 유형 분석

김동은,최우정,심재현,Kim, Dong-Eun,Choi, Woo-Jeong,Sim, Jae-Hyeon 한국수자원학회 2008 물과 미래(한국수자원학회지) Vol.41 No.2

새로운 4H-1,3,4-Oxadiazino[5,6-b]quinoxaline 유도체들의 합성

김동은,김호식,Kim, Tong Eun,Kim, Ho Sik 대한화학회 1998 대한화학회지 Vol.42 No.4

The reaction of 6-chloro-2-hydrazinoquinoxaline 4-oxide (11) with ethyl chloroglyoxylate provided ethyl 8-chloro-4H-1,3,4-oxadiazino[5,6-b]quinoxaline-2-carboxylate (12) through the intramolecular cyclization. The reaction of 12 with hydrazine hydrate afforded the $C_2$-hydrazinocarbonyl derivative 13, whose reactions with substituted benzaldehydes or heteroaryl aldehydes provided 8-chloro-2-(substituted benzylidenehydrazinocarbonyl)-4H-1,3,4-oxadiazino[5,6-b]quinoxalines (14) or 8-chloro-2-[(2-substituted methylidene)hydrazinocarbonyl]-4H-1,3,4-oxadiazino[5,6-b]quinoxalines(15), respectively. 6-Chloro-2-hydrazinoquinoxaline 4-oxide(11)와 ethyl chloroglyoxylate를 반응시켜 분자내 고리화반응에 의한 ethyl 8-chloro-4H-1,3,4-oxadiazino[5,6-b]quinoxaline-2-carboxylate(12)를 합성하였다. 화합물 12를 hydrazine hydrate와 반응시켜 $C_2$-hydrazinocarbonyl 유도체 13이 합성되었는데, 이것을 치환 벤즈알데히드류 및 헤테로아릴 알데히드류와 반응시켜 8-chloro-2-(substituted benzylidenehydrazinocarbonyl)-4H-1,3,4-oxadiazino[5,6-b]quinoxaline류(14) 및 8-chloro-2-[(2-substituted methylidene)hydrazinocarbonyl]-4H-1,3,4-oxadiazino[5,6-b]quinoxaline류(15)를 각각 합성하였다.

경기지역 화강 풍화암반의 지지력 및 침하특성에 관한 연구

김동은,허경한,Kim. Dong-Eun,Huh. Kyung-Han 한국방재학회 2005 한국방재학회논문집 Vol.5 No.4

본 연구는 화강 풍화암반의 지지력 및 침하특성을 평가할 목적으로 수행된 것으로 흡수율에 따라 풍화도를 고찰하고 원위치 심도에서 평판재하시험을 수행하여 이를 기존의 예측방법 및 공내재하시험 결과와 비교, 검토하였다. 이를 위하여 국내의 대표적인 화강 풍화암 분포 지역인 경기 <TEX>$\bigcirc\;\bigcirc$</TEX>지역을 시험 부지로 선정하였으며 그 시험 결과에 의하면 평판재하시험시 풍화도가 증가할수록 지지력은 지수적으로 감소하고 특정 풍화도를 경계로 지지력 감소폭이 크게 증가하는 것으로 확인되었다. 또한, 기 제안된 지지력 공식을 이용하여 화강 풍화암반의 지지력을 추정한 결과 풍화도가 증가할수록 평판재하시험 결과와 유사한 경향을 보이는 것으로 나타났다. 한편, 평판재하시험이 수행된 동일 위치에서 실시된 공내재하시험 결과 지지력은 비교적 평판재하시험과 유사한 경향을 보이고 있는 것으로 나타났다. The purpose of this study is to estimate the bearing capacity and settlement characteristics of the weathered granite masses, and on the process to achieve the purpose, in the first place, the weathered degree according to the absorption index was examined and reviewed, then plate bearings test in in-situ depth were tested, and finally the result was compared and examined with the result of the existing, estimate method and pressuremeter test. In order to achieve the purpose of this study, a typical area distributed with weathered granite masses, gyeonggi area, was chosen as a sample site for testing, and in the result, it appeared and found out that the more the weathered degree increases when the plate bearing test are tested, the more the bearing capacity decreases a numerical indexes and the more greatly the width of the decrease of bearing capacity increases around the boundary of specific, weathered degrees. Also, In the result from estimating the bearing capacity of weathered granite masses by the existing, suggested formula, it appeared that there is a tendency that the more the weathered degree increases, the more similar the bearing capacity becomes with the result of plate bearing tests.

4~8%Mn 열연 TRIP강의 잔류오스테나이트 생성과 기계적 성질

김동은,박영구,이오연,진광근,김성주,Kim D. E.,Park Y. K.,Lee O. Y.,Jin K. G.,Kim S. J. 한국재료학회 2005 한국재료학회지 Vol.15 No.2

The aim of this research is to develop the TRIP aided high strength low carbon steels using reverse transformation process. The $4\~8\%$ Mn steel sheets were reversely transformed by slow heating to intercritical temperature region and furnace cooling to room temperature. The stability of retained austenite depends on the enrichment of carbon and manganese by diffusion during the reverse transformation. The amount of retained austenite formed after reversely transformed at $625^{\circ}C$ for 6 hrs was about $50\;vol.\%$ in the $8\%Mn$ steel. The change in volume fraction of retained austenite with a holding temperature was consistent with the changes in elongation and the strength-ductility combination. The maximum strength-ductility combination of 40,000 $MPa{\cdot}\%$ was obtained when the $8\%Mn$ steel reversely transformed at $625^{\circ}C$ for 12 hrs. However, it's property was significantly decreased at higher holding temperature of $675^{\circ}C$ resulting from the decrease of ductility.

지역 패권 개념을 통한 '군국주의'와 '보통국가' 비교: 해군 군축조약 전·후 일본제국과 아베 2기 내각 이후 현대 일본의 사례를 중심으로

김동은,Kim, Dong-eun 한국해양전략연구소 2020 해양안보 Vol.1 No.1

이 연구는 "일본의 보통국가화는 군국주의로의 회귀인가?"라는 의문에서 출발하였다. 그래서 이를 분석하기 위해 제1·2차 세계대전 전간기의 일본제국과 현대 일본의 아베 2기 내각 출범 이후의 국제체제적 특성을 비교하였다. 이를 통해 두 시기의 국제체제적 특성이 어떠한 차이점이 있으며, 그로 인해 두 가지 사례가 보이는 차이점을 도출해내고자 하였다. 제1·2차 세계대전 전간기 당시 군국주의적 일본제국은 파리강화회의, 워싱턴 해군조약, 런던 해군조약 등을 거치면서 아시아 유일의 열강이라는 국가 자부심에 큰 상처를 입었다. 하지만 아시아 내 식민지를 가진 서구 열강들이 여전히 역내에 존재하였기 때문에 즉각적인 세력팽창으로 전환할 수는 없었다. 그러던 와중에 유럽에서 제2차 세계대전이 발발했다. 이로 인해 서구 열강들은 유럽의 전역에 집중할 수밖에 없었고, 군국주의적 일본제국은 '패권 공백'이란 국제체제적 특성을 놓치지 않고 스스로 지역 패권국이 되었다. 2012년 이후 보통국가화를 추진하는 일본의 사례는 과거 군국주의와는 달리 '패권경쟁'적 신냉전의 구도 속에 놓인 동북아시아 질서 속에서 이루어지고 있다. 특히, 일본은 주변 국가 대비 양적 군사력의 부족으로 인해 자구적인 차원에서 미일동맹 강화를 위한 보통국가로의 전환을 시도하고 있다. The study started with the question, "Is Japan's normalization of nationalization a return to militarism?" Therefore, in order to analyze this, the characteristics of the international system after the inauguration of the Japanese Empire during World War I and World War II and the Abe's 2nd Cabinet in contemporary Japan were compared. Through this, there were some differences in the characteristics of the international system of the two periods, and as a result, it was intended to derive the differences between the two examples. During the prewar period of World War I, the militaristic Japanese Empire suffered great damage from the national pride of being the only power in Asia through the Paris Enhancement Conference, the Washington Navy Treaty, and the London Navy Treaty. However, the Western powers with colonies in Asia still existed in the region, so it was not possible to turn them into immediate power expansion. Meanwhile, World War II broke out in Europe. As a result, the Western powers had to focus on the whole of Europe, and the militaristic Japanese empire became a regional hegemony without missing the international system characteristic of "the hegemony." Unlike in the past militarism, Japan's case of pursuing common nationalization since 2012 has been carried out in the order of Northeast Asia in the composition of the "cold war" new cold war. In particular, Japan is attempting to transform itself into a normal state to strengthen the US-Japan alliance on a self-reliant level due to the lack of quantitative military power compared to the neighboring countries.

이중발광층 구조를 적용한 White OLED 기술

김동은,황중국,서응수,신훈규,Kim, Dong-Eun,Hwang, Jung-Guk,Seo, Eung-Su,Sin, Hun-Gyu 한국전기전자재료학회 2015 전기전자재료 Vol.28 No.5

Cavity Perturbation Method를 이용한 마이크로파 주파수대의 고온 유전특성 측정 연구

김동은,정진호,이성민,김형태,Kim, Dong-Eun,Jung, Jin-Ho,Lee, Sung-Min,Kim, Hyung-Tae 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6

High temperature dielectric constants of the various ceramic materials have been measured using cavity perturbation method. The measurements were applied to refractory, traditional and fine ceramic powder compacts from room temperature to $1200^{\circ}C$. Calibration constant in the equation suggested by Hutcheon et al., was determined from the dielectric constants of reference specimen (teflon and alumina) at room temperature. From these results, informations on the refectory materials were obtained for the microwave kiln design and understanding of the microwave heating effects of ceramics have been improved.

하이브리드 White OLED 제작 방법과 특성

김동은,황중국,서응수,신훈규,Kim, Dong-Eun,Hwang, Jung-Guk,Seo, Eung-Su,Sin, Hun-Gyu 한국전기전자재료학회 2015 전기전자재료 Vol.28 No.5