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규산염계 무기 재료를 활용한 침투성 보수재의 기초 특성에 관한 실험적 연구
하상우(Sang-Woo Ha),오성록(Sung-Rok Oh),최연왕(Yung-Wang Choi) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.7
본 연구에서는 규산염계 무기재료를 활용한 침투성 보수재의 개발을 위한 일환의 기초 연구로써 국내에서 쉽게 입수가 가능한 규산염계 무기재료를 주성분으로 하는 침투성 보수 재를 제조하였다. 또한, 규산염계 무기재료를 활용한 침투성 보수재는 국외에서 많은 활용사례가 있는 제품군을 선정하여 보수재의 성능을 비교ㆍ고찰하고자 하였다. 실험에 사용된 규산염계 무기재료는 Sodium, Potassium 및 Lithium silicate를 주성분으로 하는 규산염계 무기재료를 활용한 침투성 보수재를 제조하였다. 규산염계 무기재료를 활용한 침투성 보수재의 성능평가는 내흡수 및 내투수, 압축 및 부착, 급속 염소 이온 침투, 급속 동결 융해, 내약품성 시험을 실시하였다. 실험결과 규산염계 무기재료를 활용한 침투성 보수재는 모든 부분에서 효과적인 성능을 발휘하는 것으로 나타났다. 이러한 결과의 주요 원인은 모세관을 따라 내부로 침투되어 조직을 치밀하게 하기 때문인 것으로 나타났다. 따라서 본 실험결과를 기반으로 콘크리트의 내구성을 향상시키는 데 다양하게 활용 가능할 것으로 판단된다. In this study, permeable repair materials mainly composed of silicate - based inorganic materials(SIM), which are easily available domestically, were prepared as a basic study for the development of permeable repair materials using SIM. SIM were compared and examined for their performance as repair materials by selecting a product group which has many cases of use in foreign countries. The SIM used were mainly composed of sodium, potassium and lithium silicate. Performance evaluation of SIM was performed by absorption and penetration, compression and adhesion, rapid chloride ion penetration, rapid freezing and thawing, and chemical resistance test. According to the test results, SIM showed effective performance in all areas, mainly because SIM permeates into the interior of the capillary and has a dense internal microstructure. Therefore, it can be used variously to improve the durability of concrete based on the results of this experiment.
Cultural Opening and Global Communication: K-pop Dance Cover by Malaysian Bodies
하상우 ( Sang-Woo Ha ) 대한무용학회 2017 대한무용학회논문집 Vol.75 No.6
This article focuses on K(orean)-pop dance cover that Malaysian youthhood have replicated via social media and dance cover competitions hosted by K’Storm and Dancedeets since the 2010s. I arouse my curiosity about how K-pop dance is re-rendered in Malaysia where Islam is adopted the state religion but various religions and cultures co-exist, called the multicultural and multiconfessional nation. What is noticeable here is that the Malaysian government countenances cultural opening by policy, which allows the younger generation to open their mind to K-pop dance music and to be accustomed to producing dance covers in their own bodies. This article explores why the youth turn away their eyes to K-pop dance choreography as much as song tunes and lyrics. It also enables me to look over what their own meanings they dissolve into dance covers. This research makes clear that dance is seen as a global communication medium beyond religious and cultural barriers when being transmitted from one country to another.
건물에너지 상세해석을 위한 VRF 시스템 에어컨의 TRNSYS 시뮬레이션 방법
하상우(Sang Woo Ha),장용성(Yong Sung Jang),김의종(Eui-Jong Kim) 대한설비공학회 2022 설비공학 논문집 Vol.34 No.2
Variable refrigerant flow (VRF) based system air-conditioner can control a number of indoor zones by a single outdoor unit. As the simulation model for this VRF system is not trivial to develop, a simple TRNSYS air-conditioner model is proposed as a methodology for describing the VRF system using the performance data provided by the manufacturer. In this work, a new simulation process algorithm is introduced to describe the detailed VRF control by a simple on/off control. Results show that the proposed model applied for a unit house of a typical flat can control indoor temperatures and humidity levels of a number of rooms under a predefined occupancy scenario. The simulation time step is a key parameter to obtain well-controlled simulation results and corresponding energy consumption.