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방사 조건이 폴리프로필렌 모노필라멘트의 탄젠트 탄성률-변형률 곡선에 미치는 영향
임정렬,심현주,김상용,Im, Jeong-Ryeol,Sim, Hyeon-Ju,Kim, Sang-Yong 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.2
The effects of spinning conditions on the tangent modulus-strain curves have been studied using isotactic polypropylene(iPP) mononlaments. The tangent modulus-strain curve, which is derived from the first derivative of the true stress-strain curve, showed three distinct peaks. The tangent modulus of the first and the second peak in the tangent modulus-strain curve were increased as the draw ratio and the spinning speed were increased. The tensile strain of the first peak had little dependence on the process conditions, however, that of the second peak decreased above the natural draw ratio. The spinning conditions had little effect on the tangent modulus of the third peak, while the tensile strain of the third peak decreased as the draw ratio was increased. The variation of the isotactic helix content in iPP monofilament, determined from the FIIR spectra, was in agreement with that of the tangent modulus-strain curve with the tensile strain.
임정렬 한국자원공학회 2004 한국자원공학회지 Vol.41 No.6
Cement industry, in some points of view, considered as environment-unfriendly because of its mass consumption of fossil fuel and resources. However, So much effort to use various wastes for raw materials and fuel for cement industry have been made constructively and these efforts changed the place of cement industry as an alternative proposal disposing various waste as economically and environment-friendly. This article introduce the present condition of waste recycling in cement industry briefly. It is expected that this article furnishes any clue to grope active resources and waste recycling scheme in other industry. 시멘트 산업은 대량의 화석연료를 사용하는 등 환경에 부담을 주는 산업으로 평가되기도 한다. 그러나 다양한 폐기물을 시멘트산업의 원료 및 연료로 사용하고자 하는 시도가 적극적으로 이루어지면서 그 성과도 가시화되어 시멘트 산업이 대량의 각종 폐기물을 친환경적으로 처리할 수 있는 현실적인 대안으로 인식되고 있다. 따라서 본 고에서는 시멘트 사업에서의 자원재활용현황 및 관련 기술을 소개하고 친환경 산업으로서의 시멘트산업을 재조명하고자 한다. 본 고가 시멘트산업뿐만 아니라 타 산업분야에서도 적극적 자원재활용의 방안을 모색할 수 있는 실마리를 제공할 수 있기를 기대해 본다.
원심모형실험을 이용한 콘크리트-사력 복합댐 접속부의 지진 시 거동 고찰
임정렬,하익수 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4
The objective of this study is to examine the characteristics of the acceleration amplification and the deformation of the interface of a concrete-rockfill composite dam subjected to earthquakes. In this study, dynamic centrifuge tests on the dam interface model, which was prepared for an existing composite dam, were carried out. From the analysis of the accelerations measured at the dam base and at the crest of the concrete, the joint, and the rockfill model around the interface, the acceleration amplification characteristics of the interface was examined. From the analysis of the displacements measured at the crest around the interface,the characteristics of the horizontal and vertical deformation of the interface was investigated. From the test results, it is found that the acceleration amplification characteristics of the joint is similar to that of the concrete model, and, on the contrary, the horizontal deformation characteristics of the joint is similar to that of the rockfill model. On all the test conditions of this study, the rockfill of the concrete-rockfill interface heaved over the concrete part during excitations. 본 연구의 목적은 지진 시 콘크리트-사력 복합댐 접속부의 가속도 증폭특성과 변위거동 특성을 파악하는 데에 있으며, 이를위하여 본 연구에서는 실제 운영 중인 복합댐을 참고하여 제작한 접속부 축소모형체에 대한 동적원심모형실험을 수행하였다. 댐기초와 접속부 주변 콘크리트부, 접속부, 사력부 정상부에서 계측한 가속도 기록으로부터 복합댐 접속부의 가속도 증폭 특성을파악하였다. 또한, 접속부 주변 댐 정상부에서 계측한 변위 기록을 분석하여, 복합댐 접속부에서의 횡방향(상하류방향) 변위 거동과 침하 양상을 살펴보았다. 실험결과 분석으로부터, 접속부의 가속도 증폭특성은 콘크리트부의 가속도 증폭특성을 따르며, 횡방향 변위거동은 사력부의 변위거동 특성을 따르는 것으로 나타났다. 또한, 접속부의 침하양상은 본 연구에서 수행된 모든 시험조건 하에서, 사력재료가 콘크리트부 위로 부풀어 오르는 융기의 형태를 나타냈다.
치근형 임프란트의 설계 형상이 골내응력 분포에 미치는 영향에 대한 유한요소해석적 연구
임정렬,이청희,조광헌 대한치과이식임플란트학회 2003 The Korean Academy of Implant Dentistry Vol.22 No.1
Root analog type dental implants installed in alveolar bones were axisymmetrically modelled for finite element stress analysis. Distributions of stresses in the bone around the implants subject to a vertical occlusal load of 50N were calculated for 3 different root analog Frialit-2 models, i. e. the stepped cylinder, the stepped screw, and the Synchro types. Main consideration was given to the stresses near the cervical area of the implant where the highest stress concentration are likely to occur, eliciting the higher risk of bone resorption. Further stress analyses were carried out to investigate the effect of the load transferring design of the abutment screw between the abutment and the fixture on the bone stress level. Results of the present study indicated that the screws on the Frialit-2 implant fixtures play significant roles for the reduced bone stress level. Screws of the higher step were turned out to be more effective. Location of the load transfer between the abutment and fixture were found to be potentially important too for the lowered bone stresses around the cervix of implants. The shorter the abutment screws, thus the nearer the load transferring area were from the cervix of the implant, the higher the stress was attained there. On the other hand, not as much reduction in the stress could be attained by a longer abutment screw indicating a good design compromise would be possible between the stresses and the length of the abutment screws.