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산소 첨가된 Cobalt(Ⅲ) 착물에 의한 2,6-di-tert-butylphenol의 산화반응
오정근,임채평,최용국,O, Jeong Geun,Im, Chae Pyeong,Choe, Yong Guk 대한화학회 2002 대한화학회지 Vol.46 No.3
메탄올 용액에서 산소 첨가된 Co(III) 착물을 촉매로 사용하여 흡광광도법에의한 2,6-di-tert-butylphenol(DTBP)의 산화반응에 대하여 알아보았다. 산화반응의 결과로서 주 생성물은 2,6-di-tert-butylbenzoqu-inone(BQ)였고 산소 첨가된 착물의 촉매 활성은 [Co(III)2(SMPD)2(Py)2]2O2가 [Co(III)2(SPPD)2(Py)2]2O2보다 더 컸으며 속도상수(K)는 4.55∼2.12${\times}$10-3/s의 값으로 주어졌다. 또한 산화반응은 촉매, 산소분자 및 기질의 노도에 1차 반응임을 확인하였으며 활성화 에너지(Ea)가 10.38kJ/mol로 주어져 Arrhenius의 특성에서 벗어는 결과를 보였다. The oxidation reaction between 2,6-di-tert-butylphenol (DTBP) and oxygen adducted Co(III) complexes as a catalysis has been studied by UV-visible spectrophtometry. According to the results, main product is 2,6-di-tert-butylbenzoquinone(BQ) and the activity of the complexes is bigger in [Co(III)2(SMPD)2(Py)2]2O2 than in [Co(III)2(SPPD)2(Py)2]2O2. The rate constant is 4.55~2.12${\times}$10$-3}$s. It was found that the oxidation reaction is primary reac-tion or concentration of catalysis, O2 molecule and substance. The reasult is far from Arrhenius properties because acti-vationenergy is 10.38 kJ/mol.
신경병증성 통증 모델쥐 뒤뿌리신경절의 Nitric Oxide Synthase 아형 및 NADPH-diaphorase 발현에 관한 연구
정성균,김수일,양은진,류택근,권오유,박경란,이영호,김원식 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.2
Injury to peripheral nerve somtimes lead to neuropathic pain. Nitric oxide(NO) is increased in the dorsal root ganglia (DRG) of neuropathic pain models, and L-NAME, a nitric oxide synthase (NOS) inhibitor, reduces neuropathic pain. However, it is not known that underlying mechanism of NO involvement in development and maintanence of neuropathic pain. It was found that there were three NOS isoforms-nNOS, eNOS, and iNOS. It is also necessary to investigate NOS isoforms in neuropathic pain. The aim of this study is to investigate NOS isoforms and NADPH-diaphorase expressions and underlying mechanism of NO involvement in neuropathic pain. The 5^th lambar (L5) DRG were obtaind after tight ligation of L5 an L6 spinal nerves for 7 days. Toluidine blue stain, immunohistochemistry for nNOS, eNOS, and iNOS, and NADPH-diaphorase histochemistry were performed. All specimens were observed under light microscope. nNOS expression was increased significantly in the cytoplasm of the DRG of ligated side at 7 day post-ligation (7D PL). eNOS expression was also increased in the blood vessel, a few neurons or satellite cells, and cell membrane of Schwann cells in the DRG of ligated side at 7D PL. iNOS expression was increased in a few blood vessels and cytoplasm of small neurons in the DRG of ligated side at 7D PL. NADPH-diaphorase expression was increased significantly in the neurons of the DRG of ligate side at 7D PL, but NADPH-diaphorase expressions were weak or absent in the blood vessel and Schwann cell in the contralateral DRG and the DRG of ligated side at 7D PL. It is suggested that NOS isoforms may be closely related to development and mantanence of neuropathic pain in order of nNOS>eNOS>iNOS.
나노크기 Ni-Fe 합금입자 분산${Al_2}{O_3}$ 나노복합재료의 합성 및 특성
남궁석,오승탁,이재성,정영근,김형섭,Nam, Gung-Seok,O, Seung-Tak,Lee, Jae-Seong,Jeong, Yeong-Geun,Kim, Hyeong-Seop 한국재료학회 2001 한국재료학회지 Vol.11 No.11
An optimum route to fabricate the $A1_2O_3/Fe-Ni$ alloy nanocomposites with sound microstructure and enhanced mechanical properties as well as magnetism was investigated. To prepare homogeneous nanocomposite powders of Fe-Ni alloy and $Al_2O_3$, the solution-chemistry routes using $Al_2O_3 \; Ni(NO_3)_2{\cdot}6H_2O$ and $Fe(NO_3)_3{\cdot}9H_2O$ powders were applied. Microstructural observation of the powder mixture revealed that the Fe-Ni alloy particles of about 20 nm in size were homogeneously surrounded $A1_2O_3$, forming nanocomposite powder. The hot-pressed composite showed improved fracture toughness and magnetic response. These results suggest that the synergy materials with an improved mechanical properties and excellent functionality can be fabricated by controlled powder preparation and consolidation processing.
오경근(O, Kyung-Geun) 아시아·중동부유럽학회 2002 동유럽발칸학 Vol.4 No.1
The modern history of Poland is undoubtedly tragic, filed with incessant occupations and repressions. However, the main cause of the tragedy was Poland's geopolitical situation in Europe at that time, not the historical and political errors of politicians or some 'Polish' weakness as many westerners have thought. Poland who situated in the centre of Europe for about 200 years, till the end of World War I, swept away and suffered severe ordeals by violent militaristic waves from their eastern and western neighbours. Sometimes Germany was more destructive, sometimes Russia. When the two countries joined, the agony of Poles reached to the summit. We can see in the history of the world that many nations under occupations collaborated with their occupants and were easily assimilated by them. Poles did not. Even during the dark and sad times they never gave up hopes of independence and liberty. Poles had ceaselessly struggled for their fatherland against the occupants at home and abroad, and they resurrected after the end of World War I. Unfortunately the external conditions, especially the collapse of Germany, Russia and Austria - the occupants of Poland - had the greatest influence on the rebirth of Poland. After the World War I, when Poles got back their liberty, they were not yet ready to run their country in harmonious and effective way. That was the reason why they failed to achieve national unity and solidarity and fell into antagonism and conflicts among political parties. In consequence, they also could understand exactly the international situations after the World War I, especially in Germany and in Russia. Poles soon had to pay for their own mistakes. At that time they even could not imagine how much it would cost. Poland was completely devastated again by Nazism and Bolshevism during the World War II. World War I is very important in the history of Poland. This paper tires to show its real meanings in the history of Poland, through detailed examine of the general situations of Poland before and after World War I.
스타니스와프 디가트(Stanisław Dygat)의 소설 <보덴 호수 Jezioro Bodeńskie>에 나타난 민족성과 개인의 정체성 간의 갈등
오경근(O, Kyung-Geun) 한국외국어대학교 동유럽발칸연구소 2004 동유럽발칸연구 Vol.12 No.2
폴란드인들은 오랜 동안 외세의 침략과 식민지지배를 받는 가운데 자기 민족의 생존과 문화를 지키기 위해서 끊임없이 투쟁해야만 하였다. 그리하여 민족의 해방과 자유를 쟁취하기 위한 개인의 희생은 폴란드사회의 덕목 이며 전통이 되었다. 특히 낭만주의 시기의 시인들은 스스로를 독립을 잃고 실의에 빠져있는 민족의 정신적 지도 자임을 자임하면서 작품을 통하여 그들이 당하고 있는 고통의 의미를 신비적-종교적으로 해석하였고 민족의 소 생을 위해 사회의 모든 개인들이 외세에 대항하여 용감하게 싸울 것을 독려하였다. 그러한 사회적 분위기 속에서 민족과 국가를 위해 고뇌하는 개인의 형상은 높게 칭송되었으나, 개인의 행복과 성공을 추구하는 것은 쉽게 용납 될 수 없었다. 한마디로 폴란드사회에서 개인은 민족의 하위 개념이었다. 스타니스와프 디가트(Stanisław Dygat)의 소설 <보덴 호수>의 주요 테마는 ‘폴란드적인 것’에 대한 논쟁 그 리고 민족과 개인의 정체성 간의 갈등이다. 주인공은 집단수용소라는 특수한 상황에서 다양한 외국인들을 상대 로 본의 아니게 ‘폴란드민족의 대변인’ 역할을 수행하게 되면서 민족적인 것과 개인적인 것들 사이에서 고민하 기 시작한다. 그러나 결국 그는 과장되고 가식적인 민족심으로 불타는 민족의 일원이기 보다는 우선적으로 아 무것에도 종속되지 않은 하나의 순수하고 독립된 개인적 존재가 되기 위해 주변에 의해 자신에게 강요된 위선 적인 외적형식을 과감히 집어던진다. 이 소설을 통해 민족과 개인 간의 올바른 관계란 어떠한 것이어야 하는지 살펴보고자 하였다. Poles had been invaded and ruled by their strong neighbors for a long time, so they had to struggle to keep their nationality and culture. Therefore a sacrifice of an individual for the freedom and liberation of the nation has become a moral excellence and a national tradition in Polish society. Especially, the romantic poets considered themselves as the spiritual leader of Polish nation, a dejected country which lost its political independence. The poets, in their literary works, interpreted the nation's agony in a mystic and religious way, and encouraged the compatriots to fight with the occupants. In this social atmosphere an individual that suffers for his nation had been praised highly, while one seeks for his personal happiness and success was not to be tolerated by the society. In a word, an individual had been a secondary thing in Polish society. The main theme of Stanisław Dygat’s novel <Lake Boden> is a dispute on Polish national characteristics, and the conflicts between the national consciousness and the individual identity. The hero of the novel is a prisoner of a Nazi’s concentration camp for foreigners on the edge of Lake Boden during the World War II. He, as a young Polish man with French citizenship, had to play a role of so called ‘the spokesman of Polish nation’ for the various foreigners, but not by of his own will. That caused a big constellation in him. At the end, he threw off this forced and double-faced hypocrisy in a decisive manner, because he, first of all, always loathed being a member of nation with exaggerated and hypocritical nationalism, but a truly independent individual, who is not subordinated to anything or anyone physically and psychologically. Author of this paper wanted to shed light on the right relationship between a nation and an individual in this novel.