• 설비공학논문집
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• 제28권6호
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• pp.224-231
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• 2016

When aiming to reduce the low frequency noise of a subway guest room through sound absorbing treatment methods inside the wall of a tunnel the resonator is often more effective than a porous sound absorbing material. Therefore, the perforated panel type resonator embedded with a perforated panel is proposed. The perforated panel is installed in the neck, which is then extended into the resonator cavity so that it can ensure useful volume. The absorption performance of the perforated panel type of resonator is obtained by acoustic analysis and experiment. The analytical results are in good agreement with the experimental results. In the case of multiple perforated panel type resonators, as the number of perforated panels increase, the 1st resonance frequency is moved to a low frequency band and sound absorption bandwidth is extended on the whole. In order to obtain excellent absorption performance, the impedance matching between multi-panels should be considered. When the perforated panel in the resonator is combined with a porous material, the absorption performance is highly enhanced in the anti-resonance and high frequency range. In case of the resonator inserted with perforated panels of 2, the 2nd resonance frequency is shifted to a low frequency band in proportion to the distance between perforated panels.

• 한국컴퓨터정보학회논문지
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• 제15권12호
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• pp.133-142
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• 2010

현재 사용되고 있는 P형 수신기는 화재 발생의 위치 검색 및 장치의 고장 유 무 등 을 실시간으로 확인하기 어렵기 때문에 화재가 발생했을 경우 인명 및 재산 피해 등을 예방 할 수 있는 기능이 없다는 문제점을 가지고 있다. 본 논문에서는 P형 수신기에서의 고장 유무에 대한 발생 신호를 실시간으로 감지할 수 있고, 화재 발생신호에 대하여 원격지에서 P형 수신기의 상황발생 정보를 탐지할 수 있는 통합화재 자동 시스템 모델을 제안한다. 제안된 시스템에서는 P형 수신기에서 상황정보를 수집 전송할 수 있는 인터넷 접속장치 부분과 P형 수신기로부터 생성된 상황정보를 분석할 수 있는 상황정보 분석 모듈 등을 설계하고 구현하였다.

• 한국지반신소재학회논문집
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• 제17권4호
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• pp.179-188
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• 2018

본 연구에서는 새로운 형태의 패널식 보강토옹벽에 대한 현장 적용성 및 구조 안정성을 평가하기 위하여 두 개소 현장에서 현장계측을 수행하였다. 새로운 형태의 패널식 보강토옹벽은 접힘홈이 형성된 띠형 섬유보강재를 패널식 전면벽체에 매립된 C형 삽입구를 통해 직접 연결함으로써 보다 일체화된 구조를 형성시킨 보강토옹벽이다. 현장계측에서는 보강토옹벽의 시공 중 및 완료 후에 발생하는 전면벽체의 수평변위와 띠형 섬유보강재의 인장변형, 전면벽체에 작용하는 수평토압 등을 측정하고 분석하였다. 분석 결과, 보강토옹벽 시공 완료 후에 전면벽체에 작용하는 최대 수평토압은 Rankine 토압의 2/3 이하 수준이고, 전면벽체에 발생된 최대 수평변위는 보강토옹벽 높이의 0.5% 이하 수준이며, 보강재에 유발된 최대 인장변형률은 1.0% 이하로 나타나 두 현장의 보강토옹벽이 모두 안정한 상태를 유지하고 있음을 알 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1429-1431
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• 2006

We developed new anti-glare(AG) layer which has improved image quality and solved mechanical problems. Conventional silica-type AG has some restrictions related to sparkling, causing mechanical defects. The new anti-glare layer is designed with adjusted optical factors and polymer type. Therefore new anti-glare layer meets two main characteristics at once using unmatched optical property between scattering in material and surrounding.

• 대한기계학회논문집B
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• 제25권3호
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• pp.347-355
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• 2001

A heat transfer analysis in a ventilation chamber of Plasma Display Panel(PDP) has been conducted. The process requirement is to precisely follow prescribed temperature trajectory while maintaining temperature uniformity for each panel. Firstly, experiment in a test chamber has been carried out and the results are compared with the unsteady 3D numerical data. Reasonable agreement was found, which suggested that the employed numerical model had its credibility in actual PDP ventilation processes. On this ground, a tact-type heating/cooling system was analyzed. The panel temperature in the 40$^{\circ}C$ tact-type system was more uniform than that in the 80$^{\circ}C$ one. For improving the uniformity of panel temperature, relocation of ventilation head to the rear part and inlet flow control are required. Comparison of full simulation of a cart and simplified simulation of one panel indicates the optimized panel pitch can also be predicted.

• 한국공작기계학회논문집
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• 제12권6호
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• pp.71-76
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• 2003

Optimal design of panel with trapezoidal type stiffeners was studied using linear and nonlinear deformation theories. Also analysis method was using closed-form analysis and finite difference energy methods, respectively. Various bucking load factors are obatined for stiffened laminated composite panel with trapezoidal type stiffeners and various aspect ratios, which are made from Carbon/Epoxy USN 125 prepreg and are simply-supported on four edges under uniaxial compression. Optimal design analyses are carried out by the nonlinear search optimizer, ADS.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1535-1537
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• 2009

High performance resistive type touch panel was fabricated on flexible polyethylene terephthalate (PET) substrates coated with Al- and Ga-codoped ZnO (AGZO) films. The AGZO films were deposited by roll-to-roll direct current magnetron sputter at room temperature. The AGZO thin films on PET substrates showed high transparency (> 85 % at 550 nm) and low sheet resistance (450 ${\Omega}$/sq.). These values were similar to those of commercial ITO films used for resistive type touch panel.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 춘계학술대회 논문집
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• pp.3-8
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• 2003

In this study, using linear and nonlinear deformation theories and by closed-form analysis and finite difference energy methods, respectively, various buckling load factors are obtained for stiffened laminated composite panel with trapezoidal type stiffeners and various longitudinal length to radius ratios, which are made from Carbon/Epoxy USN 125 prepreg and are simply-supported on four edges under uniaxial compression, and then for them, optimal design analyses are carried out by the nonlinear search optimizer, ADS.

• 대한안전경영과학회지
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• 제16권4호
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• pp.391-396
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• 2014

For the purpose of finding out the acoustical characteristics of exterior materials in bridge, analytical studies are performed with boundary elements method by using the commercial program SYSNOISE. Before analysis, to figure out material property, it was conducted experiments of absorption coefficient for absorptive material. And prediction of pressure were conducted I GIRDER type (before & after installation of absorption panel ) and BOX GIRDER type (before & after installation of absorption panel) The results show that when the absorption panel is installed, environment around bridge can help reduce traffic noise. It was proved to be the effective noise reduction counter-plan for a traffic noise in the bridges.

• 한국화재소방학회논문지
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• 제24권1호
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• pp.24-30
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• 2010

유비쿼터스 환경에 적용을 위한 목적으로 구현된 통합형 화재수신기의 개발 경험을 보고한다. 유비쿼터스 환경을 위해 수신기가 본래 가지고 있는 능력에 부가적으로 크게 세가지의 추가적인 기능이 구현된다. 즉, 지그비가 적용된 무선감지기와의 접속기능과 이더넷을 통해 전송되는 카메라 영상신호의 화면출력 기능이다. 또한 분산형 화재수신기 간의 시간동기화 기능을 위해 GPS 모듈이 적용되고 구현된다.