• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.214-217
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• 2008

We present an ultra-slim LCD module for 40-inch FHD TV. By employing edge-lit backlight system, module thickness of 10mm is achieved. To satisfy the luminance spec of 450 nits in FHD resolution, it is critical to adopt high efficient LED and optical components.

• 한국기계기술학회지
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• 제20권6호
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• pp.865-871
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• 2018

The 3-way valve have been used as a valve for opening and closing the valve by the flow control in the pressure system of the cryogenic and high pressure environment. In this paper, numerical analysis and experimental study on fracture nipple of 3-way ultra high pressure valve applied to space launch vehicle was carried out. We have developed a 3-way valve numerical simulation modeler of cryogenic environment using commercial software ANSYS 18.2. As results of numerical analysis, optimum nipple condition was derived. In addition, a 3-way valve prototype was fabricated and the fracture test was performed and compared with the numerical analysis results.

• 천문학논총
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• 제32권1호
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• pp.309-311
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• 2017

Properties of ULIRGs (Ultra Luminous InfraRed Galaxies) are important to understand the cosmic star formation history. To investigate their properties up to z=0.3, we search for ULIRGs identified by using the AKARI/FIS Bright Source Catalogue and the WISE All-Sky catalog. By matching the AKARI $90{\mu}m$ catalogue with the WISE catalog, we selected 3,452 galaxies. Additionally, combined with the SDSS DR10 spectroscopic data, we selected 952 galaxies with spec-z. We then computed total infrared luminosities using SED fitting technique, and identified 31 ULIRGs, 561 LIRGs and 344 IRGs. For these galaxies, we found an indication that ULIRGs selected by AKARI change the SED shape with redshift (z = 0.1 - 0.3).

• 한국지반공학회지:지반
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• 제12권5호
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• pp.63-78
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• 1996

퇴적연암의 변형특성을 조사하기 위하여 여러 종류의 실내시험과 원위치시험결과를 비교검토 하였다. 초음파측정시험 등의 실내시험에서 불구속 시료의 탄성계수는 원위치유효토피압에 해당하는 압밀구속압으로 구속한 시료의 탄성계수 보다 현저히 작았다. 또 삼축압축시험에서 재하피 스톤의 축변위로 부터 구한 축변형률은 시료 상.하단에서의 오차(bedding error)로 인하여 정확히 측정할 수 없고, 전체적으로 신뢰할 수 없다. 따라서 시료측면에서 직접 변형률을 측정하는 국소변형측정장치를 이용하여 0.001% 이하에서 약 1%까지 연속적으로 위와 같은 오차를 제거한 축변형률을 얻을 수 있었고, 0.00% 이하 축변형률에서 정의된 탄성계수 Emax는 원위치탄성 파속도시험으로 얻어진 탄성계수 Er와 거의 일치하였다. 변형률이 0.01%에 도달하기 이전에 변형은 비선형성을 보이기 시작하고, 실제 원위치 작용하중 범위에서 예상할 수 있는 최대변형률 0.1%에서의 할선탄성계수 Esec는 Emax의 1/2보다 여전히 큰 값을 보인다. 위와 같은 내용을 골자로 하여 정밀측정실내시험 결과에 따른 변형특성과 현장거동 및 원위치측정결과의 비교검토를 통해 변형률레벨을 고려한 원위치 탄성계수 추정법을 제안하였다.

• 천문학논총
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• 제30권2호
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• pp.217-218
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• 2015

In this work, we present the result of our follow-up observations of SDSS J092741.73+332959.1 and SDSS J130733.49+215636.7 using the 2.35 m Thai National Telescope and ULTRASPEC instrument. Both systems are listed among the recently found white dwarf main sequence binaries from the Sloan Digital Sky Survey. SDSS J092741.73+332959.1 is a new PCEB with a period of 2.3 days, the longest orbital period known to date for white dwarf binaries. SDSS J130733.49+215636.7 is confirmed to be an eclipsing system with a period of 0.21 days from the Catalina Survey's light curve, however the parameters for the white dwarf are still uncertain. Our goal is to determine precise parameters for both systems using the Binary Maker 3 software. The observation for SDSS J0927+3329 was done on 9 January 2014 in the SDSS r' filter while the data for SDSS J1307+2156 were taken in the z' filter on 27 April 2014. Our models show that the red dwarf companions in both systems are well constrained inside their Roche Lobes. We find that the binary M2/M1 ratio in SDSS J0927+3329 is close to 0.5, with white dwarf and M-dwarf temperatures of 12000 K and 3300 K, respectively. Our preliminary result for SDSS J1307+2156 show that this system has an extreme mass ratio of 0.3. The white dwarf in this system has a temperature of 7500 K and the companion star has an effective temperature of 3150 K.