• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.307-310
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• 1999

In this panel test, the toughness and post-cracking tensile strength of SFRC(Steel Fiber Reinforced Concrete) measured on 24 panels(size; 60cm $\times$ 60cm $\times$ 10cm) which are the basic characteristics than can determine the load bearing capacity of SFRC are investigated. Those values are calculated using load-deflection curves and load-absorbed energy curves. Post-cracking tensile strength of SFRC in this study are determined by yield line theory. From the test results, it is seen that the higher the volume of steel fiber is, the higher the absorbed energy is.

• 응용통계연구
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• 제24권1호
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• pp.11-23
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• 2011

Robust unit root tests are developed for dynamic panels consisting of TAR processes. The test statistics are all based on diverse combinations of individual t-type tests for significance of TAR coefficients. Limiting null distributions are established. A Monte-Carlo experiment compares the proposed tests. The tests are applied to a panel data set of Canadian unemployment rates which show asymmetric features as well as having outliers.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2001년도 춘계학술발표대회 논문집
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• pp.78-82
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• 2001

Impact behaviors of Aluminum Honeycombs Sandwich Panel(AHSP) by drop weight test were investigated. Two types of specimens with 1/2" and 1/4" cell size were tested by two impactors which are weight of $5.25\textrm{kg}_{\textrm{f}}$ and $11.9\textrm{kg}_{\textrm{f}}$. Parametric studies were achieved including the impactor weight and impact sites which consist face, long-edge, short-edge, and point of the specimen. Face one of impact sites was the strongest and short-edge one of impact sites was the weakest. The damaged area of AHSP was enlarged with the increase of impactor weight that is equal to impact energy. After 3 point bending test, fracture modes of AHSP were analyzed with AE counts. Lower facesheet was fractured in the long-edge direction and then separated between facesheet and core. In the short-edge direction after core wrinkled, lower facesheet tear occurred. Impact behavior by FE analysis were increased localized damage in fast velocity because the faster velocity of the impact was, the smaller the stress of core was. Consequently, impactor weight had an effect on widely damaged area, while the impact velocity was caused on the localized damaged area.aged area.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.191-199
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• 2021

The study examines the causal relationship between financial development and economic growth through trade openness for the leading ASEAN countries (Indonesia, the Philippines, Malaysia, Singapore, Thailand, and Vietnam). The study employs a panel data for the period of 25 years spanning from 1995 to 2015 for the six countries, yielding a balanced panel of 150 observations. Fixed effect model (FEM) and random effect model (REM) are used for the panel data, following the Hausman test performed for model selection. The trivariate Granger causality test is also used to check for possible relationship between the variables. The results show that REM is chosen based on the Hausman test result, suggesting that the trade openness has a positive association with growth whereas the financial development is positively, but insignificantly associated with growth. The reason for this is that the financial development and economic growth may be related to each other. The results are, then, further explored and confirmed by the causality test. That is, the financial development and the economic growth, through the trade openness, are found to have bidirectional positive relationships. This implies that there would be shortcomings when ignoring the presence of trade openness, which positively impacts the relationship between finance and growth.

• 한국농촌건축학회논문집
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• 제7권1호
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• pp.129-136
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• 2005

In this paper, barrier panels against falling stones have been studied experimentally with various specimens. Test results show that stiffened barrier panels show more sufficient capacity than unstiffened barrier. Each type barrier panel can be used for various situations. New barrier panel is good for increasing strength and improving environment and maintaining cost down.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.339-342
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• 2003

Main PDP panel efficacy improvement factors are discussed. A large panel efficacy improvement can be obtained through a combination of discharge efficiency improvement and phosphor improvement. Important design elements are a high Xe-content gas mixture, the application of a $TiO_2-layer$, and a new green phosphor with little saturation at high VUV-load. In a 4-inch color test panel with a conventional stripe-type cell configuration a white efficacy of 4.4 lm/W and a luminance of 5000 $cd/m^2$ is obtained for sustaining at 250V in addressed condition.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.806-809
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• 2007

SRAM cell array and peripheral circuits on display panel are designed using LTPS process. To overcome low yield of SOP, high speed parallel fault detection circuitry for memory cells is designed at local I/O lines with minimal overhead for efficient memory cell redundancy replacement. Normal read/write and parallel test read/write are simulated and verified.

• 콘크리트학회지
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• 제6권2호
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• pp.138-147
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• 1994

대형 콘크리트 판넬구조 수평접합부는 상부로부터 전달되는 축하중에 대하여 저항하게 되며 이때의 저항내력은 그라우트와 판넬의 강도, 접합부의 형태 및 단부 모멘트, 그라우트의 폭 등에 따라 변하게 된다. 본 연구는 패쇄형 수평접합부에 대한 실험연구로서 슬래브의 단부형태, 벽판넬의 단부보강 및 슬래브의 횡변위 구속에 따른 내력의 변화를 관찰하고자 하였다. 현재 대형 콘크리트 패널구조 수평접합부의 설계에 적용되고 있는 국내 규준식은 국내의 대형 콘크리트 패널구조와는 다소 다른 형태의 실험결과에 의해 유도된 식으로서 그 적용성에 대한 평가가 요망된다. 따라서 본 연구에서는 실험결과를 근거로 이에 대한 평가를 실시할 뿐만 아니라 폐쇄형 수평접합부의 내력을 평가할 수 있는 적합한 이론식을 제시 하였다. 실험결과, 상부 벽판넬의 단면이 결손(10mm)됨에 따라 약 23.5% 내력이 저감되는 것으로 나타났으며, 슬래브 단부형태의 따른 차이와 벽판넬의 단부보강에 따른 내력의 차이, 슬래브의 횡변위 구속 유무에 따른 내력의 차이는 거의 없는 것으로 나타났다. 또한, 제안되 이론식과 실험결과를 비교한 결과 이론식에 의한 결과가 실험결과와 좋은 대응을 보이는 것으로 나타났다.

• 한국초전도ㆍ저온공학회논문지
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• 제15권4호
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• pp.53-58
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• 2013

KSTAR in-vessel cryo-pump has been installed in the vacuum vessel top and bottom side with up-down symmetry for the better plasma density control in the D-shape H-mode. The cryogenic helium lines of the in-vessel cryo-pump are located at the vertical positions from the vacuum vessel torus center 2,000 mm. The inductive electrical potential has been optimized to reduce risk of electrical breakdown during plasma disruption. In-vessel cryo-pump consists of three parts of coaxial circular shape components; cryo-panel, thermal shield and particle shield. The cryo-panel is cooled down to below 4.5 K. The cryo-panel and thermal shields were made by Inconel 625 tube for higher mechanical strength. The thermal shields and their cooling tubes were annealed in air environment to improve the thermal radiation emissivity on the surface. Surface of cryo-panel was electro-polished to minimize the thermal radiation heat load. The in-vessel cryo-pump was pre-assembled on a test bed in 180 degree segment base. The leak test was carried out after the thermal shock between room temperature to $LN_2$ one before installing them into vacuum vessel. Two segments were welded together in the vacuum vessel and final leak test was performed after the thermal shock. Commissioning of the in-vessel cryo-pump was carried out using a temporary liquid helium supply system.

• 한국지진공학회논문집
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• 제10권3호
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• pp.149-158
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• 2006

보 플랜지 절취형(Reduced Beam Section, RBS) 내진 철골모멘트접합부는 국내외의 여러 실험프로그램에서 뛰어난 내진성능을 보여 주었다. 그러나 추가적으로 규명해야할 설계상의 몇몇 이슈들이 아직 남아있다. 그 중의 하나가 패널존의 보에 대한 적정강도이다. 다수의 실험결과가 존재함에도 불구하고 패널존과 보 사이의 적정강도비가 아직까지 명확하게 제시된 바가 없다. 본 연구에서는 독립적으로 수행된 국내외의 광범위한 실험 데이터베이스를 기초로 패널존 강도가 접합부의 내진거동에 미치는 영향을 포괄적으로 분석하였다. 이를 기초로 보의 좌굴을 감소시키는 동시에 충분한 접합부 소성회전능력을 보장할 수 있는 균형패널존의 강도범위를 제안하였다. 아울러 반복재하 실물대 실험결과를 만족스럽게 재현할 수 있는 유한요소모델을 구축한 후 다양한 수치해석을 통하여 실험자료에서 누락된 부분이나 실험적으로는 파악하기 어려운 거동을 고찰하였다. 이 과정에서 오늘날의 강력한 유한요소해석기법을 활용하여 많은 비용이 드는 철골접합부 실물대 내진실험을 보완하거나 적어도 부분적으로 대체할 수 있음을 확인하였다.