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조광연,류도형,신동근,임경훈,진은주,김현이,하상현,최종화,Cho, Kwang-Youn,Riu, Doh-Hyung,Shin, Dong-Geun,Lim, Kyoung-Hoon,Jin, Eun-Ju,Kim, Hyoun-Ee,Ha, Sang-Hyeon,Choi, Jong-Hwa 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
Lithium salt have been used mainly as electrolyte of thermal battery for electricity storage. Recently, The 3phase lithium salt(LiCl-LiF-LiBr) is tried to use as electrolyte of thermal battery for high electric power. It is reported that LiCl-LiF-LiBr salt have high ion mobility due to its high lithium ion concentration. Solid lithium salt is melt to liquid state at above $500{^{\circ}C}$. The lithium ion is easily reacted with support materials. Because the melted lithium ion has small ion size and high ion mobility. For the increasing mechanical strength of electrolyte pellet, the research was started to apply ceramic filter to support of electrolyte. In this study, authors used SiOC web and glass fiber filter as ceramic mat for support of electrolyte and impregnated LiCl-LiF-LiBr salt into ceramic mat at above $500{^{\circ}C}$. The fabricated electrolyte using ceramic mat was washed with distilled water for removing lithium salt on ceramic mat. The washed ceramic mat was observed for lithium ion reaction behavior with XRD, SEM-EDS and so on.
조광연,류도형,허승헌,신동근,김현이,최종화,정해원,Cho, Kwang-Youn,Riu, Doh-Hyung,Huh, Seung-Hun,Shin, Dong-Geun,Kim, Hyoun-Ee,Choi, Jong-Hwa,Cheong, Hae-Won 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.7
Ceramic Fiber separator is the promising material for thermal battery system because it reduces the production cost and offers the potential to a new application compared to a pellet type electrolyte. The molten salt electrolytes for thermal battery were prepared by the impregnation of the commercial glass filters such as GF-A, C and F (Whatman, USA) with two types of molten-lithium salts, LiCl-KCl and LiK-LiBr-LiF. The wetting properties were evaluated by wetting balance test and wetting angle measurement. The wetting behaviors were strongly affected by the composition of the molten salts and the pore structure of the glass separators. The optimum wetting conditions for maximum loading and effective retention of the molten electrolyte were also studied.
새로운 2-이미노티아졸린 유도체의 합성과 항균활성 (II)
남기달,최경자,조광연,한호규,Nam, Kee-Dal,Choi, Gyung-Ja,Cho, Kwang-Yun,Hahn, Hoh-Gyu 한국응용생명화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.6
신 농약을 개발할 목적으로 선도화합물인 티아졸린의 곁가지를 변화시킨 새로운 2-이미노티아졸린 유도체를 합성하여 항균활성을 검색하였다. 디키틴과 아닐린으로부터 제조된 아세토아세트아닐리드 유도체를 브롬화하여 상응하는 감마-브로모아세토아세트아닐리드 유도체를 얻고 이를 티오우레아 유도체와 반응시켜 2-이미노티아졸린 유도체를 합성하였다. 2-이미노티아졸린의 항균활성을 검색하고자 6 종류의 대표적인 식물 병원균에 대한 시험(in vivo)을 하였다. 2-페노치환체들은 벼도열병균에 대하여 250 ppm에서 탁월한 항균성을 나타냈다. 1차 활성시험에서 방제가 90이상으로 평가된 것만 선발하여 2차 활성시험(농도저하 시험)을 수행하였다. 2-아릴기에 전자주게보다 전자 끌게, 전자끌게 중에서도 할로겐치환체가 도입된 경우에 고 활성을 나타냈으며 불소원자가 치환된 경우에 활성이 비교적 양호하였다. A synthesis and the screening of new 2-iminothiazolines (IV) of which structures are modified based on a lead compound, thiazoline for development of new agrochemical fungicide were described. Bromination of acetoacetanilides (I) which were prepared by the reaction of diketene with anilines gave the corresponding ${\gamma}-bromoacetoactanilide\;(II)$. Treatment of II with N-phenyl-N'-methyl thiourea (III) afforded IV, structure of which was confirmed by various spectroscopic methods. Antifungal activity of the new IV was tested against six kinds of typical plant diseases (in vivo). The IV with aromatic substituents showed remarkable activity against the Pyricuraria oryzae at 250 ppm in primary screening. The candidates with control value over 90% in primary screening were selected and further tested for second screening at lower concentrations. The IV which has an electron-withdrawing substituent such as halogen, especially fluorine in aryl group showed a higher activity as compared to those with electron-donating group and meta substituent was for optimal position.
Flusilazole의 훈증 효과에 의한 양파검은곰팡이병균(Aspergillus niger)의 포자 형성 억제
김흥태,박세원,최경자,김진철,조광연,Kim, Heung-Tae,Park, Se-Won,Choi, Gyung-Ja,Kim, Jin-Cheol,Cho, Kwang-Yun 한국식물병리학회 2002 식물병연구 Vol.8 No.2
1998년 전남 신안군의 양파 상온 저장고에서 발생한 검은색의 곰팡이는 검은곰팡이병을 일으키는 Aspergillusniger로 동정되었다. A. niger AnYD-1은 3$0^{\circ}C$에서 균사생장, 포자발아 그리고 양파에 대한 병원성이 가장 양호하였다. PDA 배지 상에서 실시한 in vitro의 실험에서 flusilazole과 hexaconazole은 A. niger AnYD-1의 균사 생장 억제 효과는 적었지만, 병원균에 살균제를 직접 처리하지 않고 증기 상태로 처리하였을 때 포자의 형성을 강하게 억제하는 특이적 인 훈증효과를 보였다. Flusilazole과 hexaconazole의 훈증의 효과는 사용하는 용매, 처리 농도와 배양 온도에 따라서 차이가 있었다. Dimethylsulfoxide와 dimethylformamide를 용매로 사용하였을 때 가장 높은 효과가 나타났으며, 고온에서 배양할수록 포자형성 억제 효과가 크게 나타났다. In 1998, a pathogen isolated from infected onions was identified as Aspergillus niger. At 3$0^{\circ}C$, A. niger AnYD-1 showed the best mycelial growth, spore germination, and high pathogenicity to onions. In spite of the weak inhibitory effect of flusilazole and hexaconazole on the mycelial growth on PDA, they showed the specific inhibitory activity against the formation of spores in the vapour phase. With flusilazole and hexaconazole, the effects of the solvent, the applied concentration and the incubating temperature on the activities inhibiting the spore formation were confirmed. Their inhibitory effect on the spore formation in vapour phase was excellent by solving them with dimethylsulfoxide and dimethylformamide among tested solvents, and applying them at high temperature such as 30~35$^{\circ}C$.
학력인정제도를 수용한 문해교육 현장 변화에 관한 내러티브 연구
김성자(Kim Sungja),조광연(Cho KwangYeon),최선화(Choi SunHwa) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.17
본 연구는 현장의 이야기를 통해 문해교육 학력인정 제도를 수용한 문해교육 현장의 변화양상을 탐구하였다. 이를 위하여 연구자들은 내러티브(narrative) 연구방법에 기초하여 2018년 5월부터 2018년 12월까지 8개월 동안 성인 학력인정 문해교육 프로그램을 운영하고 있는 운영자 겸 문해교사 3명과 학력인정 문해교육에 참여한 문해학습자 3명을 심층면담 하였다. 연구 결과, 문해교육 학력인정 제도를 수용한 문해교육 현장의 변화는 다음과 같다. (1) 문해학습자 수가 증가하였으며, 문해교육기관과 문해학습자들에게 필요한 제도로 나타났다. 그러나 학교모델의 형식교육이 민간 문해교육기관들의 고유성을 퇴색시키고 있다. (2) 문해교원들은 형식에 맞추어 수업을 진행하다 보니 수업의 자율성이 적어졌으나 스스로 교육전문가라 생각하며 단계별 수준에 맞게 수업을 준비한다. (3) 문해학습자들은 자기 직면(直面)하기와 학습의 자기주도성을 통해 학력을 획득하여 결핍욕구 단계에서 비전욕구 단계의 발달로 변화가 일어난다. 이와같이 문해교육 제도화는 문해교육 현장에 긍정적인 면도 있으나 학교모델 학력인정에 사회적 가치를 더한 새로운 모델이 요구되고 있다. This study was conducted through the story of the field to explore the changing aspects of the literacy education field accepting the literacy education accreditation system. For this purpose, the researchers selected three lecturers and lecturers who are operating adult literacy education programs for 8 months from May 2018 to December 2018 based on narrative research methods, Three people were interviewed in depth. The results of this study are as follows. (1) The number of literate learners increased, and it appeared to be a necessary system for literacy education institutions and literate learners. However, formal education of the school model is fading the uniqueness of private literacy education institutions. (2) Literacy teachers have less autonomy in their classes as they are organized according to the format, but they think that they are educators themselves and prepare their classes according to their level. (3) Despite the concern that the recognition of academic achievement is over emphasized, the literate learners acquire their academic ability through self - facing and self - directedness of learning, and change from the deprivation desire stage to the development of the desire level of vision. In this way, the system of literacy education has a positive aspect in the field of literacy education, but a new model that adds social value to the recognition of school model education is required.