• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.542-544
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• 2002

This paper proposes a wavelength sensor based on the optical directional coupler. The finite-difference time-domain (FDTD) is used in analysis of the field intensity of tile light propagating thorough the structure. The device with tile width of 0.4 $\mu\textrm{m}$ and the thickness of 0.4 $\mu\textrm{m}$, which corresponding with the coupling length of 40$\mu\textrm{m}$, would provide tile linear relationship between the coupling efficiency against the wavelength. The device can sense the wavelength in a range between 1.5$\mu\textrm{m}$ and 1.6$\mu\textrm{m}$, with continuous resolution. The wide wavelength could be also done be paralleling th light to a number of wavelength-sensing modules with particularly required bands. Therefore, it could be employed as the wavelength sensing for most optical communications, optoelectronics, laser applications and etc.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.359-360
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• 2016

본 논문에서는 초고화질의 비디오 실시간 복호화를 위해 HEVC(High Efficiency Video Coding)에서 지원하는 병렬화 기술인 Slice와 Tile 기술을 이용하여 초고해상도 영상에 대한 복호화기 병렬화 성능을 비교한다. Slice와 Tile은 분할 데이터간 의존성이 존재하지 않으므로 분할된 데이터를 다중 스레드에 할당하여 데이터-레벨 병렬화를 수행하였다. 실험 결과에서는 병렬화된 복호화기 성능이 기존 순차 복호화기에 비해 최대 2.08배 고속화 되었고, 분할 데이터 수가 증가하여도 화질 손실이 거의 없는 결과를 보인다.

• Journal of the Korea Computer Graphics Society
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• v.14 no.1
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• pp.17-25
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• 2008

We proposed the method for photomosaic generation using a programmable GPU. We design vertices to generate a photomosaic through a graphics pipeline and suggest a texture representation of an image database whice is used for tile. Both the source image and the tiles are stored to texture, which are matched by a vertex shader and drawn by a fragment shader. This is much faster than several techniques which achieve the best match for each tile.

• Korean Institute of Interior Design Journal
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• no.25
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• pp.262-271
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• 2000

Nowadays tiles are widely used as architectual material because of their external beauty, solidity with fire-resisting and water-resisting qualities, and convenience for construction, preservation and repairs. Owing to the improvement of living standard and makers scramble for tile markets, we regard tiles as art and culture. Tiles have been developed with technical improvement, based on mutual relation of material and design. The purpose of the third firing is to create high value added as we show artistic merit and decorative effect. For this reason, researches on new material and design have been carried out widely. I made researches whole process from design to printing by means of computer and experiment with color and vetroza of the third firing. I hope that tile makers will share the achievement of university researchers and this paper will be useful for those who are interested in tiles.

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.325-326
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• 2010

In this study, we prepared three kinds of substrate for the adhesion strength test of cementitious tile adhesive. As a result, the maximum adhesion strength is obtained from the concrete substrate specified in ISO 13007 regardless of curing condition of tile cement specimens.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05b
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• pp.405-410
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• 1996

New methodology for mass and energy release assessment in LBLOCA post blowdown is needed and, first of all, the phenomenologically improved and quantitative assessments through experiment are essential. For tile experiment of a hot leg break LBLOCA in post blowdown, the test facility was set and its feature is that tile broken hot leg has two broken sections in the tore side and in the SG side respectively and a separation valve between the two in order to measure the release rate dividedly. Specially it was focused on whether the mass release through the SG side broken section happened or not. The mass release through the core side broken section is dependent on tile safety injection flow and that through the SG side broken section varies depending on several factors. The principal factor is the primary system pressure and the subfactors such as SI flow rate, SI temperature and initial primary pressure, may contribute, too.

• Proceedings of the Korean Geotechical Society Conference
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• 2001.03a
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• pp.215-222
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• 2001

Uncertainty study of shear strength characteristics of the marine clays was carried out based ell In-situ tests and laboratory tests on tile south-east coastal region of the Korean peninsula. Theoretical analyses were studied using both tile spherical cavity expansion theory in finite soil mass and the strain path method to determine tile cone factor using the undrained shear strengths obtained by in-situ tests, and the empirical methods in accordance with the ultimate resistance theory were also discussed. Analysis show that the empirical methods suggest more reasonable value than that of theoretical methods in terms of comparing the cone factor estimated using linear regression and frequency distribution analyses. The cone factors obtained by the empirical methods are 18, 15, and 6 respectively, from the results of total cone resistance, effective cone resistance, and excess porewater cone resistance method, and the estimated were similar to those of previous researcher's.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.9-14
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• 1996

The deflection of an end mill is very important in machining process and cutting simulation because it affects directly workpiece accuracy, cutting force, and chattering. In this study, the deflection of the end mill was studied both experimentally and by using finite element analysis. And the moment of inertia of radial cross sections of tile helical end mill is calculated for the determination of the relation between cross section and rigidity of tile tools. Using tile Bernoulli-Euler beam and and the concept of equivalent diameter, a deflection model is established, which includes most influence from tool geomety parameters. It was found that helix angle attenuates the rigidity of the end mill.

• Journal of Korean Society for Quality Management
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• v.29 no.1
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• pp.24-40
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• 2001

Response surface designs can be classified, according to the shape of the experimental region, into spherical designs and cuboidal designs. Among the central composite design(CCD)s and the Box-Behnken design(BBD)s that are popular in practice, when the number of factors is k, spherical designs are tile CCDs with the axial value being $\sqrt{\textit{k}}$ and the BBDs, and cuboidal designs are the CCDs with the axial value being 1. With the CCDs having $\sqrt{\textit{k}}$ as the axial value, the radius of the experimental region varies with number of factors, but these designs are the 5-level designs. With the BBDs that are 3-level designs, the radius of the experimental region does not vary with the number of factors. In this article, we propose tile 3-level spherical designs which are constructed so that tile radius of the experimental region varies with the number of factors.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.630-634
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• 2014

In this paper, a tile projector was developed for the control of low-frequency underwater echoes. The projector was designed to cover a wide area such as the hull of a submarine, and to have a relatively thin thickness. As a preliminary work for active echo control, the performance of the projector was measured in an anechoic water tank. The transmitting voltage response as well as the passive echo reduction were measured to evaluate the performance as an underwater projector.