GFRP를 이용한 경량합성바닥의 휨성능에 대한 실험적 평가

류재호,박세호,주영규,김상대,Ryu, Jae-Ho,Park, Se-Ho,Ju, Young-Kyu,Kim, Sang-Dae 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.1

최근 타워형 아파트구조에 많이 사용되고 있는 무량판 구조시스템을 대신해 층고절감 및 장스팬 구현 그리고 내화성능향상을 목적으로 GFRP를 이용한 경량합성바닥을 개발하였다. GFRP를 이용한 경량합성바닥은 웨브에 개구부를 가지는 비대칭 강재보 하부에 GFRP를 부착하고 슬래브에 경량체를 삽입한 중공합성바닥이다. 이에 개발된 합성바닥의 휨성능을 평가하기 위해 GFRP, 중공률, 웨브의 개구부 등을 변수로 실대 실험을 수행하였다. 그 결과 GFRP를 이용한 합성보 실험체는 기준 실험체에 비해 휨내력 및 강성 측면에서 10% 높은 성능을 나타냈으며, 구조물이 항복할 때까지 완전합성거동하였다. 항복 이후 웨브개구부 주변의 응력집중현상에 의해 연성이 감소하는 현상이 나타났으며, 최대내력점까지 미끄러짐의 발생은 미소하였다. 내력설계 측면에서는 안전율을 고려해 해석값의 85%를 설계내력으로 평가하는 것이 타당한 것으로 나타났다. To obtain a lower story height with a long span and better fire resistance, a new composite floor system using GFRP (glass-fiber-reinforced plastics) was proposed. This floor system consists of asymmetric steel with a web opening, a hollow core ball, concrete, and GFRP. To evaluate the flexural performance of the new composite floor system, an experiment was conducted. The test parameters were the presence of GFRP, the void ratio in relation to the hollow core balls, and the web opening. The test results showed that the resistance and stiffness of the specimen with GFRP were 10% higher than those of the reference specimen, and that fully composite action was accomplished up to the yielding point. After the attainment of the yield strength, the ductility of the specimen was reduced due to the stress concentration around the web openings. The slip between the concrete and steel beam, however, was small. Thus, in the design of the proposed new floor systems, it is desirable that the calculated resistance be reduced by 15%, for safety.

샌드위치 플레이트 시스템을 이용한 합성보의 동적 특성

류재호,주영규,윤성원,Ryu, Jae-Ho,Ju, Young-Kyu,Yoon, Sung-Won 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.4

To improve the noise and vibration problems of the existing public parking systems, new floor system was proposed. This system consists of the Sandwich Plate System(SPS), steel beam and post-tensioned steel tendons. To verify the dynamic characteristics such as the natural frequency and damping ratio of the system, the free vibration test was performed. Test results showed that the natural frequency of the SPS composite beam was 23.8Hz and it was increased by 3.8% by installing the post-tensioned tendons. The damping ratio of the specimen with tendons was about 1.64%.

운동 에너지를 고려한 Flywheel Energy Storage System 설계와 진동 저감을 위한 3상 유도기의 슬롯수 산정에 관한 연구

류재호(Jae Ho Ryu),김희민(Hui Min Kim),이치우(Chee Woo Lee),박관수(Gwan Soo Park),정동욱(Dong Wook Jeong) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.1

Flywheel Energy Storage System (FESS) is composed by flywheel generating rotating potential energy and motor/generator set charging and discharging electric potential energy. The flywheel and motor/generator is connected by rotating shaft. And torque characteristics of motor/generator part can influence charging and mechanical traits of FESS. This paper analyze about motor/generator design method of 5 [kWh] FESS and torque ripple, harmonic effects by change of slots. At First, this paper proposes a method to estimate the flywheel size and the rotor size of the motor from the the rotational kinetic energy by inertia of FESS. The number of induction motor rotor slots for torque ripple reduction in the high speed operation region is selected. This paper performs to reduce the noise and vibration of the flywheel composed of coaxial with motor/generator and flywheel and realize the high efficiency.

게임 엔진을 활용한 건축 디지털 트윈 구축시 필수 컴포넌트 제안

류재호(Ryu, Jae-Ho) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.1

황산 가수분해 조건이 셀룰로오스 나노크리스탈의 수율, 입도 및 전기화학적 특성에 미치는 영향

류재호(Jae Ho Ryu),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2011 펄프.종이기술 Vol.43 No.4

고분자전해질의 LbL multilayering 시 pH와 염 농도 조건에 따른 섬유의 전기화학적 특성

류재호(Jae Ho Ryu),이성린(Sungrin Lee),진성민(Seong Min Chin),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2008 펄프.종이기술 Vol.40 No.4

건축에 있어서 가상성에 관한 연구

류재호(Ryu, Jae-Ho) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.12

The visual perception is one of the most important factors in architectural design because the understanding about outside space of human is mostly rely on the visual information from his eyes. So, there are many examples of using this kind of visual perception to create the virtual space and the ornament of architectural design with the limited circumstances in the history of architecture. One of the examples of the deception of visual perception in architectural design is the entasis style of column to provide the psychological stability of the observer. Also, the making of the deeper perception in the shallow space using the perspective principle is the another example of deception design for the observer in architectural design. The making of virtuality in the space and architectural element is one of the design methods in architecture from the ancient age. Nowadays the various technologies support this method to add the further meaning in architectural design such as expansion, variability and de-materialization of space. One example of applying the new technology in the space design is the installing of the wide display device in the wall, floor or ceiling to make the virtual image which provides realistic experience and virtual space perception of the observer. Sometimes the wall which is composed of special devices can be transparent to look through like a pane of glass. Otherwise, it can be opaque to make the independent space from the others. The using of computer graphics and sensors with actuators will create the different meanings of wall, floor and ceiling from the traditional architectural elements. This research has analyzed the virtuality concept in many architectural designs and showed the effects of this design results. The results of this paper will be useful in applying the virtuality factors in the architectural design, ornament and space, which is significant for understanding the tendency of the futuristic architectural space design.

BIM Research & Solution

류재호(Jae Ho Ryu) 한국BIM학회 2013 KIBIM Magazine Vol.3 No.1

교육시설계획에 있어서 정보화가 미치는 영향 분석 - ICT의 보급에 의한 교육시스템의 변화에 관한 문헌 고찰을 중심으로 -

류재호(주저자) ( Ryu Jae Ho(주저자) ),류재호(교신저자) ( Ryu Jae Ho(교신저자) ) 디자인융복합학회 2018 디자인융복합연구 Vol.17 No.6

본 논문은 정보기술의 발달과 가상현실, 3D 프린팅, IoT와 같은 미래기술의 발달에 의한 교육시스템의 변화에 따른 미래교육시설의 디자인 원칙에 대한 예측을 목적으로 하고 있다. 미래지향적인 교육시설에 대한 가이드라인을 얻기 위해서 본 논문에서는 현재의 교육분야에서 다루어지고 있는 이슈와, 미래의 교육시설의 모습을 예측하고자 새로운 ICT기술의 발달로 영향을 받고 있는 현재 교육시스템을 조사하였다. 이를 통해 미래의 교육시설은 탈장소, 탈집단화, 탈집중화, 현장중심체험, 자발적 학습환경, 기술지원환경, 다목적공간, 물리적 캠퍼스의 해체, 교사와 학생의 역할변화와 같은 특징들을 가질 것으로 예측하였다. 따라서 미래의 교육시설은 제3의 교사로서의 열린 공간의 특성을 가지는 공간으로 디자인되어야 할 것이다. The purpose of this research is to predict the architectural design principles in educational facilities according to the trend of information and communications technology(ICT) and the educational system which is influenced by the futuristic cutting edge technologies such as virtual reality, 3D printing, Internet of Things(IoT). In order to acquire some design guidelines for the future educational facilities, many current issues and researches have been surveyed, which are related with the education system. Also the change of the pedagogy philosophy and method influenced by the information technologies(IT) are reviewed to capture the future image of class in educational facilities. From the previously described process, we have theses results; First, the future educational facilities will have these characteristics, such as tele-presence, customization, decentralization, experiential learning, self-learning environments, technology supported education, form follow function, no physical campus and education prosumer(producer & consumer) features. Considering the derived those characteristics, we have to prepare to design the open space for the educational facilities which can provide the cooperative environments for the students as the third teacher with the integration of those technologies.

건축설계 검증을 위한 증강현실 설계지원도구 개발

류재호(Jae-Ho Ryu) 한국컴퓨터정보학회 2015 韓國컴퓨터情報學會論文誌 Vol.20 No.1

본 연구에서는 건축정보모델링(Building Information Modeling, BIM) 데이터와 증강현실기술의 결합을 통한 기본적인 형태의 건축설계지원도구의 개발 방법을 제안한다. 본 연구에서 제안하는 시스템은 투명형 디스플레이, Mock-up 모델 및 디지털 건축 모델을 적극적으로 활용하여 다자간 디자인 검증 협업작업을 진행할 수 있는 시스템으로서, 투명형 디스플레이를 증강현실에 이용하기 위한 하드웨어 구성 및 고유한 시스템 프레임의 형태를 제안하고, 사용자의 시점에 맞는 증상현실 영상을 제시하기 위한 캡쳐 이미지의 배경 제거 및 관찰자 시점의 보정에 대해서 설명한다. 그리고 건축분야에서 많이 활용되고 있는 BIM으로 작성된 디지털 건축 모델의 증강현실 활용 가능성에 대하여 검토하였다. 또한 본 논문에서 제작한 2인용의 건축디자인 협업 시스템은 보다 많은 사용자가 작업을 진행할 수 있는 시스템으로 확장이 가능하며, 확장된 디자인평가시스템을 구성하기 위한 설계안에 대해서 제안한다. 이와 같은 증강현실기술을 이용한 건축설계지원도구의 개발을 통해 건축디자인 분야에서 실물 모델 및 BIM 저작툴로 작성된 디지털 모델을 적극적으로 활용하여, 보다 효율적이고 경제적인 건축디자인 검증 작업이 가능할 것으로 생각된다. In this study we have proposed the prototype of design support device for architectural design assessment using the building information modeling(BIM) data and the augmented reality(AR) technology. The proposed system consists of novel hardware composition with the transparent display, the mock-up model and the digital architectural model in the new shape of frame. The removal of background and the correction of viewer point in the capture video are proposed in order to use the transparent display in AR application. The BIM data formats are reviewed to be converted for using in AR application. Also the proposed system can be expanded to multi-user collaboration system from two user system through the suggested hardware and software compositions. The results of this study will be applied to use the mock-up model and digital architectural model in order to carry out the design assessment process efficiently and economically in the architectural design field.