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저점도형 고성능 감수제가 다양한 혼화재 종류 및 치환량 조건에서 고성능 시멘트 페이스트의 레올로지 성능에 미치는 영향 분석
전종운 ( Jeon Jong-woon ),손배근 ( Son Bae-geun ),이향선 ( Lee Hyang-sun ),한동엽 ( Han Dong-yeop ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
High performance concrete with low water-to-cement ratio has been widely used with increased demand of high rising buildings and huge scaled structures. Additionally, for high performance concrete, various SCMs are replaced to improve its performance from fresh state to hardened state. With the drawback of increased viscosity of the concrete mixture for high performance concrete, low-viscosity typed high range water reducer is the relatively new admixture. Therefore, as a goal of the research, under using various SCMs with wide range of content, the performance of low-viscosity typed high range water reducer was evaluated. Especially, in this research, the influence of low-viscosity typed high range water reducer on rheological properties including plastic viscosity and yield stress were assessed. As a result of the research, it is expected to provide a fundamental information of low -viscosity typed high ranged water reducer on high performance concrete with various conditions of SCMs.
IoT플랫폼이 결합된 광센서가 없는 태양광 추적 시스템
정덕겸,전종운,박성민,정교범,Jung, Deok-Kyeom,Jeon, Jong-Woon,Park, Sung-Min,Chung, Gyo-Bum 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.3
Generally, conventional solar tracking systems employ irradiance sensors to track a sun position, which enables the system to generate maximum solar energy. The usage of irradiance sensors increases system costs and deteriorates the performance of systems from sensor malfunctions. In this paper, a new solar tracking system without irradiance sensors has been proposed in which the controller capable of controlling and monitoring remotely is based on Artik platform. The proposed system tracks the sun position by comparing the amount of currents from several solar panels, resulting in removing irradiance sensors. In order to verify the performance of the proposed solar tracking method, the 12[V]-20[W] prototype system is built and implemented. Since the proposed system has remote monitoring functions through the employment of Artik as the IoT platform, more advantages in installation, maintenance and expanded functionality can be obtained compared to the conventional solar tracking system. 일반적으로 감지식 태양광 추적 시스템은 태양의 위치를 추적하기 위해 광센서를 사용하여, 최대 전력을 생산한다. 광센서 채택은 시스템 제작 가격을 상승시키고, 오동작에 의한 성능 저하를 초래할 수 있다. 본 논문에서는 IoT플랫폼 기반의 원격무선 모니터링이 가능하고, 광센서가 없는 새로운 태양광 추적 시스템을 제안한다. 태양광 발전을 위해 사용되는 여러 개의 태양광 패널의 출력 전류량을 비교하여 태양 위치를 광센서 없이 추적한다. 추적 성능의 검증을 위해서 12[V] 20[W] 태양광 발전 시스템을 제작하여 실험을 수행하였다. 본 논문에서 제안한 시스템은 IoT 플랫폼을 사용하여 원격모니터링이 가능하기 때문에 기존 태양광 추적 시스템에 비해 설치, 유지 보수 및 기능 확장의 장점이 있다.