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      • KCI등재

        Formation of Poly(vinylidene difluoride) Membranes with Various Pore Sizes by a Phase Inversion Process and Membrane Performance of Aqueous and Non-aqueous Solution System

        이규호,김인철,Lee Kew-Ho,Kim In-Chul The Membrane Society of Korea 2005 멤브레인 Vol.15 No.1

        비대칭 폴리비닐리덴플루오라이드(PVDF) 막을 상전환법으로 제조하였다. 도포용액은 PVDF를 용매인 N-ethyl-2-pyrrolidone (NMP)와 비용매인 1,4-dioxane, diethyleneglycol dimethyl ether (DGDE), acetone, (equation omitted)-butyrolactone(GBL)의 혼합용매에 녹여서 제조한다. 여러 첨가제가 도포용액 특성, 투과특성과 막 구조에 미치는 영향을 조사하였다. 응고제인 물과 1,4-dioxane, DGDE, acetone과의 상용성이 NMP보다 낮아서 기공크기가 작아진다. 첨가제의 양을 조절하여 기공크기를 변화시켰다. 혼합용매(수계 및 비수계)가 막의 투과성능에 미치는 영향을 살펴보았다. 용액점도뿐만 아니라 표면장력도 용매 투과특성에 영향을 끼침을 알 수 있었다. Asymmetric PVDF membranes were prepared by the phase inversion from casting solutions containing PVDF, NMP as solvent and 1,4-dioxane, DGDE, acetone, or GBL as additives by immersing them in water. The effects of various additives on the casting solution properties, permeation properties, and membrane structures were investigated. Low miscibility of 1,4-dioxane, DGDE and acetone with the coagulant (water) compared with NMP resulted in reducing the membrane pore size. When DGDE is used as an additive, the pore size was reduced because of its incipient sharp interface formation in the water. GBL increased membrane pore size because of its polarity compared to that of NMP. The PVDF membranes with various pore sizes could be obtained by controlling the amount of additive. The effect of mixed solvent (aqueous and non-aqueous solution) on permeation through membrane was investigated. Not only solution viscosity but surface tension affected solvent permeation.

      • KCI등재

        Investigation of Photocatalytic Process on Removal of Natural Organic Matter in Nanofiltration Process

        이규호,최인환,김인철,민병렬,Lee, Kew-Ho,Choi, In-Hwan,Kim, In-Chul,Min, Byoung-Ryul The Membrane Society of Korea 2007 멤브레인 Vol.17 No.3

        광촉매 반응이 자연유기물에 의한 나노여과막의 오염에 미치는 영향을 살펴보았다. 광촉매 분해공정은 자연유기물의 분해와 변형에 효율적이었으며 이산화티타늄과 고정화 비드를 광촉매로 사용하였다. 광촉매적 특성을 비교하기 위하여 칼슘 이온 존재 시의 휴민산의 광분해를 모델 반응으로 설정하였다. 광분해 전에는 치밀한 막오염층이 형성되어 막오염을 가속화시킨 반면, 광분해 후에는 막오염이 크게 감소하였다. This research investigated the effect of a photocatalytic reaction on nanofiltration(NF) membrane fouling by natural organic matter(NOM). The photocatalytic degradation was very effective for destruction and transformation of NOM and was carried out by titanium dioxide($TiO_2$) and $TiO_2$-immobilized bead as a photocatalyst. In order to compare their phtocatalytic properties, the photocatalytic degradation of humic acid in the presence of calcium ion was used as a model reaction. After the photocatalytic degradation the membrane fouling was dramatically decreased.

      • 중간세계로서의 언어와 메타포ㆍ비유, 그리고 언어의 틈새론

        이규호 국제기독교언어문화연구원 2004 기독교언어문화논집 Vol.8 No.-

        The late Kyu Ho Lee, Ph. D. 2004. The Language as an Intermediate World, Metaphor, Simile, and the Gap of Language. Collected Papers on Christian Language Cultcere. The world of language is neither a world of objectivity nor a world of subjectivity. Rather, the world of language attaches objective things to subjective things, for the world of subjective idea makes it possjble to have a true meaning only in connection with objective things. Therefore, the world of language can be called an intermediate world. Metaphor and Simile have become important elements in the language since the age of Greece. And all the linguists overall the world have thought that all the languages are composed of metaphor and simile. They have thought so because metaphor and simile are of great help in making up the network of all languages. The network of linguistic world as well as an intermediate world of language plays an important role in creating our systematic view of the world and our sense of values. Strictly speaking, a gap can be found to exist in all Languages. In our expression of our objective facts and subjective idea there can be found a gap lying spontaneously between them. Accordingly, a gap comes into being as a result of an encounter between liquidity and fixation in language actividity. It can be said that there are linguistic, historical, and social gaps. Such gaps make it possible to interpret our human history in a diffent way. In conclusion, language may well be proud of meaningful language, differently interepreting language, gap-language, and an intermediate language.

      • KCI등재

        남성의 화장품 구매 실태에 관한 연구

        이규호,곽승준,이나겸,김병관 국제보건미용학회 2017 국제보건미용학회지 Vol.11 No.1

        As the social culture that takes the appearance of male and female as their abilities spreads and ideal male image changes in the intensive competition society such as nowadays, this study was willing to investigate the status of purchasing cosmetics by male. It analyzed the male knowledge of cosmetics, purchasing status, 3 factors of satisfaction, age and academic career, difference analysis along occupation and how the knowledge of cosmetics influences on purchasing status using factor analysis, analysis of variance and multiple regression analysis. As the results of analysis, it appeared that the factor of cosmetics-using satisfaction shows the significant difference in age and academic career and the factor of cosmetics-knowledge does so in academic career. It also appeared that the factor of cosmetics-knowledge influences on status of purchasing cosmetics and using-satisfaction with very high positive (+) strength at the level of p<.001 and showed the results that using-satisfaction gets lowered as cosmetics-knowledge gets higher.

      • KCI등재

        산성암반배수에 의한 절취사면 구조물의 피해 현황과 평가

        이규호,김재곤,박삼규,이진수,전철민,김탁현,Lee Gyoo Ho,Kim Jae Gon,Park Sam-Gyu,Lee Jin-Soo,Chon Chul-Min,Kim Tack Hyun 한국지반공학회 2005 한국지반공학회논문집 Vol.21 No.5

        산성암반배수가 발생되는 지역을 중심으로 사면구조물의 피해현황과 환경오염 실태를 파악한 결과를 하면 다음과 같다. 첫째, 산성암반배수가 발생하는 절취사면은 대부분 숏크리트공법으로 처리하고 있으며, 산성암반배수가 사면구조물의 안정성에 악영향을 미치고 있다. 둘째, 숏크리트는 산성암반배수에 의해서 현저하게 열화되어 가고 있으며, 용수발생량이 많은 곳은 배면공동이 발견되는 경우도 있다. 셋째, 절취사면에서 산성암반배수가 발생되는 곳은 국부적으로 불안정하고, 이를 보강하기 위하여 앵커와 록볼트를 사용하고 있으나 강산성암반배수에 의해 부식될 우려가 크다. 넷째, 식생공의 경우 산성암반배수가 잔디 씨앗의 발아 및 성장에 악영향을 미치고 있어 일부 지역에서는 생석회를 사용하여 산성암반배수를 중화시키고 있으나 근본적인 대책은 되지 못하고 있다. 다섯째, 황철석의 풍화로 발생한 산에 의해 배수가 낮은 pH를 유지하면서 중금속들을 용출시켜 지속적으로 배출하여 부근 토양, 지하수와 하천수를 오염시킬 개연성이 매우 크다. 산성암반배수의 발생 가능성을 암석유형별로 평가한 결과 편마암, 화강암의 경우 산성배수 발생 가능성이 낮은 군으루 열수변질을 받근 화산암, 응회암, 탄질셰일, 금속광산 폐석시료는 산성배수 발생 가능성이 높은 군으로 분류되었다. 따라서 토목건설공사과정에서 빈번히 발생될 것으로 예상되는 사면절취에 의한 암반산성배수에 대비하여 발생개연성이 있는 지역에 대한 지반정보의 확보 및 대책기술의 개발이 요구되고있다. The aim of this study was to investigate damage conditions of cut slope structures due to acid rock drainage (ARB) and to assess the acid production potential of various rocks. Acid rock drainage is produced by the oxidation of sulfide minerals contained in coal mine zone and mineralization belt of Pyeongan supergroup and Ogcheon group, pyrite-bearing andesite, and Tertiary acid sulfate soils in Korea. Most of cut slopes producing ARB have been treated with shotcrete to reduce ARD. According to the field observations, ARD had an adverse effect on slope structures. The corrosion of shotcrete, anchors and rock bolts and the bad germination and growth diseases of covering plants due to ARD were observed in the field. The concentration of heavy metals and pH of ARD from cut slope exceeded the environmental standard, indicating a high potential of environmental pollution of surrounding soil, surface water and ground water by the ARD. According to acid base accounting (ABA) of the studied samples, hydrothermally altered volcanic rocks, tuffs, coaly shales, tailings of metallic mine had a relatively high potential of acid production but gneiss and granite had no or less acid production potential. It is expected that the number of cut slopes will increase hereafter considering the present construction trend. In order to reduce the adverse effect of ARD in construction sites, we need to secure the data base for potential ARD producing area and to develop the ARD reduction technologies suitable.

      • KCI등재

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