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서수연 ( Seo¸ S. Y. ),이용택 ( Lee¸ Y. T. ),이현호 ( Lee¸ H. H. ),이리형 ( Lee¸ L. H. ),천영수 ( Chun¸ Y. S. ),양지수 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
Retrofit method on flexural T shape wall of apartment is evaluated through an experimental work in this study. For two flexural walls damaged up to almost failure, reinforcements yielded and concrete cracked below height of Id are replaced with new reinforcements and concrete, respectively. Two retrofit method, one is attaching aramid sheet to the surface of specimen, the other placing additional reinforcements in the web and replacing hoop for boundary elements. Horizontal cyclic loads are applied to the top of the specimen with constant axial load. It was shown that the structural capacity of damaged walls could be recovered by placing additional reinforcement in the section of wall. However, in case of using aramid sheet as flexural reinforcement for retrofitting, it is necessary to consider the loss of structural capacity due to the anchor problem at the end of sheet.
김근수,추고연,김태환,성재석,이용택,오숭호,이민수,최호상 한국공업화학회 2003 응용화학 Vol.7 No.1
Zeolite membrane was produced by hydrothermal synthesis on α ̄alumina substrate using clear solution method. Zeolite membrane can separate liquid phase reactants like a water/mehtanol system. The compogition ratio of raw materials. 90 Na_2O : 1 Al_2O_3 : 9 SiO_2 : 5760 H_2O was used for preparation of zeolite membrane. The deposition states of zeolite crystal on alumina substrate by change of aging time were analysed through XRD and SEM.
희석반응 방식을 이용한 NaA형 미립 제올라이트 박막 제조 연구
김근수,김태환,추고연,이민수,이용택 한국공업화학회 2004 응용화학 Vol.8 No.1
In this work, zeolite membranes were prepared using a conventional hydrothermal method and clear solution method followed by characterization of permeation and separation factor. Especially submicron size zeolite powder was used as seed material on the alumina support and the temperature of synthesis was fixed at 90?. It was confirmed that the prepared zeolite membrane using clear solution method was more uniform compared with the hydrothermal synthesis. The zeolite membrane thickness of ca. 10㎛was obtained.