• Advances in Computational Design
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• 제4권4호
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• pp.381-395
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• 2019

This paper proposes a new approach to model the screw joints of integrated ceilings via the finite element method (FEM). The simulation models consist of the beam elements. The screw joints used in the main bars and cross bars and in the W bars and cross bars are assumed to be rotation springs. The stiffness of the rotation springs is defined according to the technical standards proposed by the National Institute for Land and Infrastructure Management of Japan. By comparing the results of the sheer tests and the simulation models, the effectiveness and efficiency of the simulation models proposed in this paper are verified. This paper indicates the possibility that the seismic performance of suspended ceilings can be confirmed directly via beam element models using FEM if the stiffnesses of the screw joints of the ceiling substrates are appropriately defined. Because cross-sectional shapes, physical properties, and other variables of the ceiling substrates can be easily changed in the models, it is expected that suspended ceiling manufactures will be able to design and confirm the seismic performance of suspended ceilings with different cross-sectional shapes or materials via computers, instead of spending large amounts of time and money on shake table tests.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.1131-1136
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• 2006

In this study, an experimental and numerical analysis on the flow characteristics of heating and cooling unit installed within ceiling with functional modules was carried out. And the flow characteristics of the heating and cooling unit was investigated with the main parameters such as each filter and inside structure. The experimental results show the possibility of medium filter application. And the numerical results show that the effect of improved inside structure of heating-cooling and air-conditioning unit on flow distribution.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2008년도 춘계학술발표대회 논문집
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• pp.159-162
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• 2008

The main consumers of wedding market are young people. They prefer differentiated and unique wedding and with the deregulation of using five-star hotels as wedding spaces in 1999, the wedding market has entered into an era of new competition. Under the background like above, this study tries to provide the basis for the effective and systematic interior coordination of wedding spaces. For this study, large banquet halls at 16 five-star hotels in Seoul were selected. Theoretical and field examinations, and interviews were conducted. The elements of wedding space include the architectural elements of floor, walls, and ceiling and lighting, color, fabric, table setting, and flower coordination. This study found that uniformity or repetition is used for the walls while modules are used for the ceiling. Unlike the past, LED is used for lighting to create diverse colors and the range of colors used has been broadened. In addition, fabric, table setting, and flowers are used actively to create overall atmosphere of the space. When these elements are aggregated and analyzed by hotel for interior design style, Hotels H and S have modern style, Hotels L and P have elegant style and Hotel IP have classical style.

• 제어로봇시스템학회논문지
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• 제22권2호
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• pp.75-82
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• 2016

Visible light communication (VLC) using LED lamps is suitable for implementing an indoor positioning system in an indoor environment where the global positioning system (GPS) signal does not reach. In this paper, we present an indoor positioning system for mobile robots using a VLC beacon and fuzzy rules. This system consists of an autonomous mobile robot, VLC modules, and device application software. Fuzzy rules are applied to plan the global and local paths along which the mobile robot navigates indoors. The VLC transmitter modules are attached to the wall or the ceiling as beacons to transmit their own location information. The variable pulse position modulation (VPPM) algorithm is used to transmit data, which is a new modulation scheme for VLC providing a dimming control mechanism for flicker-free optical communication. The mobile robot has a receiver module to receive the location information while performing its mission in the environment where VLC transmitters are deployed.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.791-795
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• 2014

In this paper, in order to impart the aging condition of the parts, by configuring the cycle of temperature from low temperature was performed by applying the aging conditions for vehicle cockpit module. The reason for the selected modules of the cockpit vehicle parts, because the joint occurrence typical components of the room component is a first module and ceiling cockpit module. After setting the excitation profile using the BSR exciter only that this is for the module degradation after the initial and grasp the change in the dynamic characteristics of the modules based on the before and after deterioration may be made in the module, grasp the noise generating position I measured the noise and proximity. Was also visualized on the position of the joint is generated using a sound camera to objective results occurring where the joint is selected through subjective evaluation.

• Journal of Advanced Marine Engineering and Technology
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• 제35권1호
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• pp.102-107
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• 2011

에너지 절감을 위한 백색 LED 기반 조명은 자유공간상의 광 무선통신 분야를 개척하는 기회를 제공하였다. 가시광 통신을 위한 트랜시버는 LED와 포토다이오드로 구성되므로 높은 대역폭과 신뢰성, 저 전력 등의 장점이 있어 기존의 무선통신과 양립할 수 있는 기술로 주목받고 있다. 그러나 기존의 건축물이나 배와 자동차와 같은 구조물에 조명을 이용한 통신 네트워크를 설치한다는 것은 쉬운 일이 아니다. 본 연구에서는 자동차 또는 선박의 통신망으로 갖춰진 CAN 기반의 LED 통신시스템을 제안한다. 실내무선 네트워크를 위한 CAN 인터페이스 모듈과 트랜시버를 조명 시스템에 적용 가능함을 보였다.