• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.53-54
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• 2018

BA 조석표에서 국내의 표준항은 한곳(인천항) 밖에 존재하지 않아 인천항을 표준항으로 사용하지 못한 경우 외국항(중국, 일본)을 표준항으로 사용하고 있다. 그 결과 BA 조석표와 지역(KR) 조석표가 차이가 발생하여 이에 대한 원인을 분석하였다.

• Solar Energy
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• v.18 no.1
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• pp.45-55
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• 1998

태양열이나 심야전력과 같이 에너지의 공급과 수요가 시차적으로 다를 경우 축열저장이 필수적이다. 축열조는 부하에 따라 그 부피가 커지게 되고 부피는 곧 경제성과 밀접한 관계를 갖고 있다. 따라서 이 연구는 축열조의 소형화에 관한 연구로 이번 실험에서 수행된 Nodule S-64(PCM-NaOH)인 구형 볼타잎을 사용하였고, 260Lit 용량의 축열조를 설계 제작하여 수학적 모델링과 실험을 병행하였다. 실험에 사용한 S-64는 이번 실험을 위해 제작한 것으로 축열 결과 현열인 물의 경우보다 축열량이 두배로 증가하였다. 따라서 기존 축열조 부피를 절반정도 축소가 가능하며, 운전조건에 따라 더이상 줄일 수도 있어 태양열이나 심야전력용 축열조로 매우 적합함을 알 수 있었다.

• Korean Journal of Optics and Photonics
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• v.25 no.1
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• pp.21-28
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• 2014

In this paper a Super Multi-view display method using a pinhole array with full parallax was proposed. The proposed method was simulated and its parameters analyzed. Also, the distribution and irradiance of light through each pinhole on the retina receiver, according to the change of crystalline lens focal length, were found by simulation. As a result, an image free of blurring was obtained while the crystalline lens focused on the depth plane of the three-dimensional image created by the imaging lens.

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.59-62
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• 2010

The limitation of constant for tide correction is identified using the T_tide $MATLAB^{(R)}$ package. A suggestion is presented in calculation of local phase lag(k) by a/15 (a is angular speed of any constituent in degree) from the g, phase lag measured by standard time meridian latitude.

• Journal of Korean Society of Steel Construction
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• v.12 no.6
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• pp.759-767
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• 2000

In this study, the time dependent internal stress changes of a Concrete Filled Steel Tube(CFT) column during a fire test were quantitatively analyzed. The strain ratio of a CFT column on the different loads was measured by tensile strength tests in terms of yield strength, tensile strength average extensibility and elasticity modulus. To understand the internal material properties change of concrete in CFT column damaged due to a fire, the compressive strength and elastic modulus tests were measured on a core sample from the center of the steel tube after the fire test. The elastic modulus test measured the strain from the stress. To determine the fire temperature of the test material, a differential thermal analysis was done. From the tested result, the gained data were conducted and an analysis method was suggested. The purpose of this work is to suggest a basic data for structure regulation enactments of the internal fire design of CFT.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.197-198
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• 2022

Based on the carbonation depth measurement by the indicator for concrete collected from old structures and the quantitative analysis of Ca(OH)₂ and CO₂ in the carbonation section before and after the carbonation depth and in the non-carbonation section, the absorbable CO2 amount and carbonation degree measurement result is as follows 1) The carbonation depth of the 40-year-old reinforced concrete structure was measured to be about 22 mm. (basement interior wall, marble finish, strength 30MPa) 2) The amount of CO₂ absorbed by the concrete was about 4.3% of the sample weight, and the carbonation degree was estimated to be about 53%.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.4B
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• pp.763-770
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• 2000

In this paper, a new stereo image compression algorithm is suggested in which the residual image extracted from the stereo image by the disparity-compensated prediction method is compressed using the wavelet transform considering the inter & intra correlation between subbands. The compression performance of the proposed method is significantly improved by comparing with the conventional algorithm such as EPIC, EPWIC & JPEG through the computer simulation and the PSNR is also increased about 3.5dB compared with the EPIC. Finally, the stereo image having a good 3D effect can be reconstructed from the compressed image data by the proposed method.

• The Korean Journal of Rheology
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• v.6 no.2
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• pp.96-103
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• 1994

열방성 액정 고분자인 백트라와 폴리페닐렌 설파이드와의 블렌드를 주사전자현미경, 시차주사 열분석기, 그리고 모세관 레오미터를 이용하여 전 조성 범위에 대하여 연구하였다. 블렌드의 결정화와 용융에 관한연구결과로부터 두 고분자 사이에는 상호작용이 없음을 알수 있다. 이는 두 개의 상이 완전히 분리되기 때문이다. 폴리페닐렌설파이드를 많이 포함하고 있는 블렌드의 점도는 상당히 감소되었으며 이는 높은 전단속도에서 열방성 액정 고분자가 섬유구조를 갖기 때문이다. 열방성 액정고분자의 섬유구조는 열방성 액정 고분자가 섬유구 조를 갖기 때문이다. 열방성 액정 고분자의 섬유구조는 열방성 액정 고분자와 등방성상과의 점도비와 전단속도에 의해 영향을 받음을 알수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.367-369
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• 2006

사람은 일반적으로 깊이를 지각하는데 두 눈으로 들어오는 영상의 시차(binocular disparity)를 이용하며 6-15m 정도의 범위 내에서는 매우 뛰어난 깊이 판별 능력을 보인다. 그러나 사람은 하나의 눈만으로도 깊이를 지각하는데 별 어려움을 느끼지 못한다. 이것은 공간의 깊이 지각 단서로 양안단서안이 아니라 다양한 단안단서(monocular Cue)들이 함께 사용되기 때문이다. 본 논문에서는 사람이 공간 깊이정보 파악에 사용하는 것으로 알려진 여러 단안 단서들 중 영상의 채도(saturation) 정보와 디포커스(defocus) 정보, 기하학적 깊이(geometric depth) 정보에 기반을 둔 단안 영상에서의 상대적 깊이지도의 생성방법을 제안한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.317-318
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• 2023

This study is part of the carbonation degree DB accumulation through quantitative analysis of carbonation depth, Ca(OH)₂ and CO₂ according to the type of finish and years of use of old concrete structures in order to predict the amount of CO₂ that can be absorbed through carbonation of concrete. To this end, the depth of carbonation of the concrete core specimen is measured using an indicator, and the dry amount of water combined with CO₂ in the sample is measured using a differential thermal gravimetric analyzer for samples in the carbonation area and non-carbonated area classified by the indicator, and the absorption compared to the weight of the sample. The amount of absorbed CO₂ was calculated. In addition, the degree of carbonation was calculated through quantitative comparison of Ca(OH)₂ in the carbonation section and non-carbonation section. In the future, we will continue to add the survey and analysis data of dismantled structures and use them as basic data for estimating the amount of carbon dioxide that can be absorbed according to the exposure conditions and years of use by concrete mix.