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정동석,Jeong, Dong-Seok 한국기술사회 2008 技術士 Vol.41 No.2
In this paper is described "the water resources policy, a new paradigm of water resources control. the characteristic of rainfall in Korea and the compatibility of a new water routes opening in natural river". Also the construction of the Korean grand waterway in the view of disaster prevention, flood control, irrigation and environment-friendly transportation is needed eventually. And I detail a routes of Korean grand waterway, using of a flood gate, supply of irrigation water. cruse duration, activating under developed region and economic efficiency.
정동석 ( Dong Seok Jeong ),남병욱 ( Byeong Uk Nam ),장미옥 ( Mi Ok Jang ),홍채환 ( Chae Hwan Hong ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.2
본 연구는 이축 압출기를 사용하여 생분해성 고분자인 Poly-L-lactic acid(PLLA)와 충격보강제로 Poly (ethylene-co-glycidyl methacrylate)(EGMA)와 Engage를 각각 PLLA에 대해 100/0, 75/25, 50/50, 25/75, 0/100의 조성으로 블렌드를 제조하였고, 3개의 PLLA/EGMA 블렌드에는 탈크를 첨가하였다. 이를 DMA, FESEM, UTM, Izod 충격시험기를 사용하여 PLLA 블렌드의 모폴로지와 점탄성, 기계적 특성을 측정하였다. DMA와 충격시험기의 측정결과 EGMA와 Engage의 함량이 증가함에 따라 상온에서의 저장탄성률이 감소하였고, 충격강도는 증가하였다. 한편 탈크가 첨가되면 저장탄성률은 증가하고 충격강도는 감소하였다. FESEM 분석으로부터, 매트릭스에 도메인이 잘 분산되어 있음을 알 수 있었고, UTM을 통하여 EGMA와 Engage의 함량이 증가하면 굴곡탄성률과 인장강도가 감소되지만, 탈크를 첨가함으로써 이를 보완할 수 있었다. In this work, PLLA/EGMA blends were prepared by melt blending of biodegradable Poly-L-lactic acid(PLLA) with Poly(ethylene-co-glycidyl methacrylate)(EGMA) and Engage as impact modifiers by twin screw extruder. Blend compositions of PLLA/Impact modifier blends were 100/0, 75/25, 50/50, 25/75 and 0/100, respectively. Also, Talc was added to 3 PLLA rich phases on PLLA/EGMA blends. The morphology, viscoelastic/mechanical properties were characterized by FESEM, DMA, UTM and Izod impact tester. DMA and Izod impact test data showed that storage modulus at room temperature with increasing EGMA and Engage contents decreased, and impact strength increased. However, storage modulus at room temperature increased by adding talc. From FESEM image, we observed that domain phase was well dispersed into matrix. Although the tensile strength and flexural modulus were decreased with increasing the content of EGMA and Engage in them, they could be supplemented by adding talc.