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        • KCI우수등재

          심층폭기(深層曝氣) 활성(活性)슬러지법(法)을 이용(利用)한 제지폐수(製紙廢水)의 생물학적(生物學的) 처리(處理)에 관한 연구(?究)

          김환기,양봉용,이복열,Kim,,Hwan,Gi,Yang,,Bong,Yong,Lee,,Bok,Yul 대한토목학회 1992 대한토목학회논문집 Vol.12 No.2

          활성(活性)슬러지법(法)에 의하여 고농도(高濃度) 유기성(有機性) 폐수(廢水)를 처리(處理)할 경우에 발생(發生)되는 문제점(問題點)은 폭기조내(曝氣槽內)의 미생물농도(微生物濃度)와 산소전달능력(酸素傳達能力)이 제한(制限)받고 있는 점이다. 이러한 문제점(問題點)을 극복(克服)하기 위하여 높은 산소전달능력(酸素傳達能力)을 나타내는 심층폭기(深層曝氣) 활성(活性)슬러지법이(法) 폐수처리현장(廢水處理現場)에 적용(適用)되고 있다. 따라서 본(本) 연구(?究)는 심층폭기(深層爆氣) 활성(活性)슬러지법(法)의 액체순환특성(液體循環特性)과 산소전달특성(酸素傳達特性) 및 제지폐수(製紙廢水)의 유기물(有機物) 제거특성(除去特性)에 대하여 연구(?究)하게 되었다. 연구결과(?究結果), 심층폭기장치(深層曝氣裝置)는 일반(一般) 산기식(散氣式) 폭기장치(曝氣裝置)에 비하여 산소전달능력(酸素傳達能力)이 매우 높고 순산소(純酸素) 폭기법(曝氣法)과 거의 같은 산소전달특성(酸素傳達特性)을 나타낸다. 또 폭기조내(曝氣槽內) 미생물농도(微生物濃度)와 유기물부하(有機物負荷)를 높게 유지할 수 있어 고농도(高濃度) 유기성(有機性) 폐수(廢水)를 처리(處理)할 수 있었다. A generated problem in treated highly concentrated organic wastewater by activated sludge process is the limitation of biomass concentration and oxygen transfer capability in aeration tank. To overcome the limitation, the deep shaft activated sludge process which has high oxygen transfer capability was applied to the wastewater treatment process. This paper investigated the characteristics of liquid circulation, oxygen transfer and biological treatment of paper mill wastewater by the deep shaft activated sludge process. From the obtained results, it was found that the oxygen transfer capability in the deep shaft system was much greater than those in the conventional aeration systems and almost tantamount to the pure oxygen system. The deep shaft system could treat highly concentrated organic wastewater by higher biomass concentration and organic loading rate.

        • 남원시 생활하수가 요천 수질오염에 미치는 영향에 관한 연구

          김환기,김태근,이영우 全北大學校 附設 都市및環境硏究所 1995 都市 및 環境硏究 Vol.10 No.1

          The Yo stream(drainage area: 526.08㎢, length: 52.0㎞) is one of the branchs of the Seom Jin river. In order to evaluate effects of the sewage in Nam-Won City(I) on the water pollution of the Yo stream, water qulity analysis and estimate the pollutant discharge rate were carried out at six sites in the Yo stream basin from December 1994 to September 1995. The results of research are summarized as follow: 1. According to the water quality of six sites evaluated by BOD, ST1 is classified into I grade, ST2 and ST3 are II grade, ST4∼ST6 sites are III grade. 2. Amount of total BOD load from the Yo stream basin was estimated 11,810㎏/day of which 13.9% was contributed by land, 0.1%, was contributed by industrial waste water, 43% was contributed by population and livestock, respectively. 3. As Nam-Won city(I), discharge rate and effluence rate of BOD, SS were estimated 28.4%, 10.6% and 20.6%, respectively. 4. Since Nam-Won city sewage treatment plant started operation, BOD, SS reduction rate of Nam-Won city(I) were forecasted 36.1% and 20.6%, respectively.

        • KCI등재
        • KCI등재
        • KCI등재

          코리언 디아스포라 문학의 ‘혼종성'과 초국가주의 - 남미의 코리언 이민문학을 중심으로

          김환기 한국비교문학회 2012 比較文學 Vol.0 No.58

          The purpose of this thesis is to study post-boundary hybridity in the literature where the limits and hybridism in Korean diaspora become dissolved and reassembled. Especially, it is focused on post-central glocalization related to the identity of Korean immigrants and their society in Latin America. 'Tropical literature' and 'Los Andes literature' are well-known liberatory magazines in Korean community in Latin America. These magazines are the memories and history of Korean diaspora and they are the symbol of glocalization that has portrayed the distorted Korean modern history and has included the identity of people at the edge of the society in post-cold war era. 'Tropical literature' and 'Los Andes literature' have focused on the topics and visualized in literary methods as follows. (1) self-esteem of their community in Latin America, the national spirit, and the memories of their country and their will to go back home (2) cultural conflicts with the local people and the society, and Korean immigrants' efforts to co-exist and collaborate with them by communicating with foreign culture, (3) the establishment of the post-boundary spirit world, the issues related to going back to Korea and returning to Latin America, generational changes, education, international marriages, description of beautiful nature of Latin America, religious humanism, and so on. Furthermore, these magazines describe the immigrants and their society's boundary and limit, which would have changed in the situation with the issues of inside and outside, center and fringe, and idealism and reality, and adopted the approaches of Korean' typical errantry and returning spirit, realistic methods to it. In this way, immigrant's diaspora world of view and glocalization point of view, including boundary and Hybridity provide new social and cultural paradigm to Asian societies including Korea where homogeneity, nationalism, and self-centered world were more valued.

        • 全州市 上關 上水道 水原池의 富營養化와 어류폐사

          金煥起,金益秀,元燦喜,曺基主 全北大學校 附設 都市및環境硏究所 1988 都市 및 環境硏究 Vol.3 No.-

          Recently, fishes in Sangkwan reservoir for water supply of Chonju was dying and the water quality of the reservoir was under suspicion. In order to investigate the source of above appearance, water quality and eutrophication of the reservoir was undertaken for January to May in 1988. Obtained results are as follows. ① Pollution source of toxic material was not existed in the reservoir basin and the water quality of the reservoir was graded 3 for water supply. ② Concentration of Chl-α in the reservoir was 1.85∼3.28 ㎍/ℓ, T-N was 0.21-0.31 ㎎/ℓ , T-P was 0.031-0.041 ㎎/ℓ and algae were appeared 19 species indicationg the mesosaprobic and then the reservoir was mesosaprobic reservoir. ③ Being exhausted the reserved water for winter drought, the reservoir was not showed the winter stratification or spring turnover and was indicated 6.8 ㎎/ℓ of the dianal minimum DO concentration. Therefore, fishes in the reservoir was not died. ④ Dianal minimum DO concentration of an ordinary year was forecasted to 1.79-2.29 ㎎/ℓ and then fishes which are sensitive to DO concentration such as a crucian carp, dace, puntungia herzi, especially eggs-laying fishes were able to death.

        • KCI등재

          Notch Signaling Controls Oligodendrocyte Regeneration in the Injured Telencephalon of Adult Zebrafish

          김환기,이동원,김은미,정인영,김수현,김범준,박해철 한국뇌신경과학회 2020 Experimental Neurobiology Vol.29 No.6

          The myelination of axons in the vertebrate nervous system through oligodendrocytes promotes efficient axonal conduction, which is required for the normal function of neurons. The central nervous system (CNS) can regenerate damaged myelin sheaths through the process of remyelination, but the failure of remyelination causes neurological disorders such as multiple sclerosis. In mammals, parenchymal oligodendrocyte progenitor cells (OPCs) are known to be the principal cell type responsible for remyelination in demyelinating diseases and traumatic injuries to the adult CNS. However, growing evidence suggests that neural stem cells (NSCs) are implicated in remyelination in animal models of demyelination. We have previously shown that olig2+ radial glia (RG) have the potential to function as NSCs to produce oligodendrocytes in adult zebrafish. In this study, we developed a zebrafish model of adult telencephalic injury to investigate cellular and molecular mechanisms underlying the regeneration of oligodendrocytes. Using this model, we showed that telencephalic injury induced the proliferation of olig2+ RG and parenchymal OPCs shortly after injury, which was followed by the regeneration of new oligodendrocytes in the adult zebrafish. We also showed that blocking Notch signaling promoted the proliferation of olig2+ RG and OPCs in the normal and injured telencephalon of adult zebrafish. Taken together, our data suggest that Notch-regulated proliferation of olig2+ RG and parenchymal OPCs is responsible for the regeneration of oligodendrocytes in the injured telencephalon of adult zebrafish.

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