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862 results on '"Choi, S. J."'

2. Study of the State and Variability of Marine Environment in the Japan/East Sea in Cruise 58 of the R/V Akademik Oparin

Author

Lobanov, V. B., Sergeev, A. F., Kim, G., Nam, S., Maryina, E. N., Han, H., Popov, O. S., Tishchenko, P. P., Vlasova, G. A., Zverev, S. A., Choi, S. J., Jeong, H., Kim, B., Kim, Y., Kim, S. Y., Lee, I., Lee, H., Lee, H., Leusov, A. E., Mariaysh, A. A., Prushkovskaya, I. A., Rudykh, Y. N., Ryu, Y., Ryumina, A. A., Sagalaev, S. G., Semkin, P. Y., Seo, H., Shkirnikova, E. M., Shlyk, N. V., Shvetsova, M. G., Tsoi, V., and Ulanova, O. A.

Published
2021
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5. DEVELOPING A TECHNOLOGY FOR PRODUCING DRONE-BORNE HYPERSPECTRAL IMAGES TO MONITOR LARGE-AREA MIXED HERITAGE

Author

Kim, S. H., Lee, J. Y., Choi, K. H., and Choi, S. J.

Abstract

This study compared differences in the shooting and pre-processing techniques between manned and unmanned aerial images, and verified the precision of the images by comparing the ground sample distance between them. GSD of manned aerial image taken at high altitude could not discern tree shapes from 150 cm per pixel, but unmanned aerial image taken at low altitude (200 m) could distinguish trees individually with 30 cm per pixel. It, therefore, found that it is efficient and economically effective to produce unmanned hyperspectral images within the large-area mixed heritage. In addition, the unmanned aerial images have lower atmospheric errors and the ground sample distance that is high enough to distinguish individual trees, so they were found to be applied to the monitoring and the diagnosis for understanding the vegetation management and the health of the large-area mixed heritage.

Published
2023

6. 3D PHOTOGRAMMETRY MODELING FOR SAFETY MONITORING OF FORTRESS WALLS

Author

Choi, S. J., Lee, J. Y., Yoo, S. J., and Kim, S. H.

Abstract

In the monitoring to prevent collapse or tipping in the structure of linear-shaped fortress walls, the record of shapes like slope or protrusion is very important(Jo and Hong, 2019). As the way to record the shapes, laser scan or photogrammetric technology is employed. A laser scan that has to install several points of measurement has a limitation in recording them if the terrain is undulating, or the structure becomes huge. Photogrammetry has a shortening effect in terms of cost and process (Kim, 2020) compared to that.This study examined a measure for producing a 3D mesh model with aerial and ground photography for fortress walls. In addition, this study tested if it would be possible to monitor the slope and protrusion, etc. of fortress walls. This study tested the accuracy of the model produced with photogrammetry to use in the diagnosis and monitoring of the structural safety of fortress walls.The research subject was Korea’s cultural heritage, Seosan Haemieupseong Fortress, and a model was produced for the section about 100m of the fortress walls.The positional accuracy, elevation/section accuracy, LOD, and texture joint precision of two models (Model A & Model B) produced with photogrammetry and laser scan were compared.This study revealed that the model produced at LOD Level 4 would be effective for monitoring the displacement since it could measure the shape, curvature, and slope of stones of the fortress walls.

Published
2023

15. Design of the RAON accelerator systems

Author

Jeon, D., Hong, I. S., Kim, H. J., Kim, J. W., Bodenstein, R. M., Cha, H. J., Choi, S. J., Choi, S., Choi, O. R., Do, H., Choi, B. H., Choi, C. J., Han, J., Han, W. K., Hyun, M. O., Jang, H., Joo, J. D., Joung, M. J., Jung, H. C., Jung, Y. C., Kim, D. G., Kim, E., Kim, H., Kim, H. J., Kim, J. H., Kim, J. Y., Kim, W. K., Kim, Y., Kim, Y., Kim, M., Kim, M. J., Lee, J. H., Lee, K. W., Lee, M. K., Park, G. T., Ryu, S., Shin, I., Shin, J. H., Song, J. -S., Yoon, S., Yi, K. -H., Yun, C. C., Zaghloul, A., Kim, S. K., Matlabjon, S., Park, G. S., Bahng, J. B., Hwang, J. G., Jang, S. W., and Kim, E. S.

Published
2014
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30. Resistive-memory embedded unified RAM (R-URAM)

Author

Kim, S., Choi, S.-J., and Choi, Y.-K.

Subjects
Aluminum oxide -- Electric properties, Computer programming -- Analysis, Embedded systems -- Design and construction, Random access memory -- Evaluation, Computer programming, Embedded system, System on a chip, RAM, Business, Electronics, Electronics and electrical industries
Published
2009

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