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Long-term dynamic stiffness of resilient materials in floating floor systems
Kim, Changhyuk,Hong, Yoon-Ki,Lee, Jung-Yoon Elsevier BV 2017 Construction and Building Materials Vol.133 No.-
<P><B>Abstract</B></P> <P>The number of high-rise residential buildings being constructed in countries with high population density is increasing in response to the need to utilize small areas. In Seoul, which is the densest of the Organization for Economic Co-operation and Development (OECD) countries, high-rise buildings have become more common in response to the considerable population increase. To diminish floor impact sound, resilient materials are generally applied between the concrete slab and the finishing mortar. Floor impact sound is affected by various characteristics of resilient materials such as dynamic stiffness, thickness, etc. Many experimental studies have been conducted to evaluate the impact sound reducing capacity of the materials, and have indicated that the dynamic stiffness of resilient materials has a close relation with the floor impact sound reduction. In most cases, a resilient material having lower dynamic stiffness has better floor impact sound reduction capacity. However, the dynamic stiffness of soft resilient materials could be changed under long-term loading and this could result in an increase of floor impact sound. The variation of the dynamic stiffness of 8 of the most widely used resilient materials under four different loadings were monitored for more than 500days. The test results indicated that the dynamic stiffness of the resilient materials for floor impact sound increased with time, and that the variation of the dynamic stiffness was affected by loading time, weight of loading, and material properties. In addition, the proposed formula predicted the dynamic stiffness of resilient materials subjected to long-term load with reasonable agreement.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Increased deflection and dynamic stiffness were observed under long-term loading. </LI> <LI> Material properties of the resilient materials were measured for more than 500days and used for the proposed equation. </LI> <LI> The relation between dynamic stiffness and deflection can be easily and reliably predicted using the proposed equation. </LI> <LI> Increases of the floor impact sound level after ten years were observed in most of the loading cases. </LI> <LI> It was able to understand both the serviceability and structural capacity of the resilient materials in this study. </LI> </UL> </P>
수원 화성 증강현실(AR) 관광 모바일 애플리케이션 개발
김창혁(Kim, Changhyuk),송기수(Song, Kisu),백승현(Baek, Seunghyeun),김진영(Kim, Jinyoung) 대한건축학회 2018 대한건축학회논문집 Vol.34 No.8
Hwaseong Fortress was designated as a World Heritage Site by UNESCO in 1997 in recognition of its architectural, cultural, and historical significance. In order to provide a compelling and active experience to the visitors of Hwaseong Fortress more effectively and intuitively, an augmented reality (AR) mobile application is developed. The main objective of this paper is to describe the implementation of AR technology in the developed application; and most importantly, how the application is designed for the visitors to actively and intuitively experience the various architectural and historical contents of Hwaseong. The tour routes and their point of interests were selected carefully after deliberation of their contents. To maximize the user interaction with the application and the architectural contents of Hwaseong, not only the conventional AR technology (marker method), but also the markerless AR method is adopted in the developed application. It is expected that visitors of Hwaseong Fortress enjoy the tour, while learning the architectural, historical, and cultural contents through the active and intuitive interaction with the developed AR mobile application.