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김원표(Won-Pyo Kim),이정근(Jeong-Gun Lee),고영웅(Young-Woong Ko),변용환(Yong-Whan Byun) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.5
In this paper, we describe the design and implementation of smart learning device that supports efficient learning system to enhance the lecture quality. The proposed system allows multiple learner devices to effectively connect to lecture devices and allows learning to proceed with an interactive interface based on feedback. In this paper, we constructed AP network based on embedded board, which simplifies smart learning system. This allows multiple learner devices to access the lecture device simultaneously. In addition, we propose a feedback based user interface that enables lecturers and learners to interact effectively. With this approach, we can enhance the learning effect through smart learning. In order to show the usefulness of the proposed system, we conducted a feasibility test and analysis on the network construction of smart learning.
ASPHALT 와 CARBON BLACK 으로 처리된 고재구성 포틀랜드시멘트의 수화특성
조헌영,김희락,홍원표 ( Heon Young Cho,Hee Rack Kim,Won Pyo Hong ) 한국공업화학회 1992 공업화학 Vol.3 No.1
콘크리트의 내구성을 향상시키는 기존의 공법과는 다르게, 시멘트 입자 표면에 아스팔트 膜을 부분적으로 형성시킨 후 카본블랙을 處理하여 콘크리트의 전반적인 耐久性을 현격히 향상시킨 高耐久性 포틀랜드시멘트(ACTPC)의 水和反應 特性을 X-Ray, SEM, 전도열량계 등을 사용하여 조사한 결과는 다음과 같다. ACTPC가 물과 접촉하면 발수성을 나타내는 아스팔트 膜은 시멘트 粒子와 물의 접촉 및 시멘트 粒子로부터 각종 이온들의 溶出을 방해하여 初期 水和反應이 억제되지만, 카본블랙은 결정핵 역할을 하므로 일정기간이후 의 水和反應을 촉진한다. For the enhancement of the concrete durability, we developed high - durable portland cement (ACTPC) by physical treatment of ordinary portland cement with asphalt and carbon black. In this research, the hydration reaction characteristics of ACTPC were studied by using SEM, X-Ray, Conduction Micro Calolimeter etc. When the ACTPC is mixed with water, it is believed the asphalt films on cement particles suppress the early stage of hydration reactions of cements, because the films hinder the contact with water and the elusion of soluble ions from particles. But the carbon blacks on the cement particles accelerated the hydration reactions of cement after a while, because the micro particles can be used as seed crystals in CaO-SiO_2-H_2O gel formation.