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폴리에틸렌 튜브를 혼입한 경량 시멘트 경화체의 기초물성 평가
김세영 ( Sae-young Kim ),전봉민 ( Bong-min Jeon ),김효열 ( Hyo-youl Kim ),오상균 ( Sang-gyun Oh ) 한국건축시공학회 2006 한국건축시공학회 학술발표대회 논문집 Vol.6 No.2
This study proposes the physical properties of the hardened lightweight cement using the polyethylene tube and to make the fundamental data regarding a new lightweight concrete development. The aerated concrete is displaying various effects such as lightweight, insulation characteristic and it is coming to be widely applied the slab layer of apartment as an insulating material but currently the aerated concrete has many problems. Therefore, demonstrating similar property of former aerated concrete and improving the defects, developing new hardened cement is needed. In this study, we predict adopting possibility of hollow core polyethylene tube, as a material to make cement hardening containing a lot of void. So we changed the mixing ratio, a diameter and length of the polyethylene tube and improved the compressive strength and unit capacity weight of the lightweight cement hardening body. From the test results, we judge that the aerated concrete is a developmental possibility.
김세영(Sae-Young Kim),이서영(Seo-Young Lee) 한국관세학회 2003 관세학회지 Vol.4 No.3
Under the WTO system, direct export support system that provides financial and tax related support is altogether prohibited. This presented an obstacle in strengthening competitiveness of Korean companies and in increasing exports continuously. One of the methods used to solve this problem was to actively leverage export insurance. Given this situation, this paper conducted an analysis on the effect of export insurance on the export. Prior to empirical analysis, unit-root test was conducted to understand the safety of Time Series. The results show that all variables are not I(0) Time Series. Instead, they are I(1) Time Series. To this, cointegration verification was conducted based on the use of Johansen verification method to define the existence (or non-existence) of long-term balance relationship among variables. However, the results show that there is no relationship of cointegration between the variables of Time Series. Thus, this paper conducted empirical analysis by using OLS based on the use of difference method. The results of empirical analysis showed significant and positive effects of Korea export insurance system upon the exports.