• Journal of the Optical Society of Korea
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• v.17 no.1
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• pp.103-108
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• 2013

The operation of a Doppler wind LIDAR in a mobile environment is very sensitive to shocks and vibrations, which can cause critical failures such as misalignment of the optical path and damage to optical components. To be able to stabilize the LIDAR and to perform wind field measurements in motion, a shock absorption and vibration isolation system was designed and implemented. The performance of the vehicle-mounted Doppler wind LIDAR was tested in motion, first in a circular test route with a diameter of about 30 m and later in regular expressway traffic. The vibration isolation efficiency of the system was found to be higher than 82% in the main vibration area and shock dynamic deflection was smaller than maximal deflection of the isolator. The stability of the laser locking frequency in the same mobile environment before and after the vibration isolation system installation was also found to be greatly improved. The reliability of the vibration isolation system was confirmed by good results of the analysis of the LIDAR data, in particular the plane position indicator of the line of sight velocity and the wind profile.

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.326-327
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• 2006

• Journal of Ocean Engineering and Technology
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• v.15 no.3
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• pp.131-131
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• 2001

• Proceedings of the Korean Aquaculture Society Conference
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• 2005.05a
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• pp.59-60
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• 2005

• Proceedings of the Korean Aquaculture Society Conference
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• 2005.05a
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• pp.61-61
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• 2005

• Journal of information and communication convergence engineering
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• v.13 no.1
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• pp.36-41
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• 2015

With the rapidly increasing and widespread use of electronic and controlling equipment, the control of the electromagnetic (EM) wave environment becomes an important social issue. To solve the electromagnetic compatibility (EMC, both electromagnetic interface and electromagnetic susceptibility) problems, in this paper, we introduce the countermeasure techniques focused on EM wave absorbers for EMC problems in our laboratory at the Korea Maritime and Ocean University. The current technologies related to EM wave absorbers to solve EMC problems will first be described. The prospects of and a design for EM wave absorbers including a smart absorber with a heat radiating function will then be suggested.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.156-156
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• 2017

• Journal of Ocean Engineering and Technology
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• v.33 no.1
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• pp.10-16
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• 2019

The aim of this study was to improve the vertical motion performance of floating marina structures and to optimize the shapes of the structures for the Korea coastal environment. The floating body is connected to a plate-shaped submerged body through a connecting line under the water that has a stiff spring that serves to reduce the heave response. This system, which has two degrees of freedom, was modelled to analyze the interaction between the floating body and the submerged body. The vertical motion of the two-body system was compared with the motion of a single body to verify that the system could perform as an optimized model.

• Ocean and Polar Research
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• v.43 no.2
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• pp.53-63
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• 2021

Changes in a marine environment have a broad socioeconomic implication on fisheries and their relevant industries so that there has been a growing demand for the medium-range (months to years) prediction of the marine environment Using a medium-range ocean prediction model (Ocean Mid-range prediction System, OMIDAS) for the northwest Pacific, this study attempted to assess seasonal difference in the mid-range predictability of the sea surface temperature (SST), focusing on the Korea seas characterized as a complex marine system. A three-month re-forecast experiment was conducted for each of the four seasons in 2016 starting from January, forced with Climate Forecast System version 2 (CFSv2) forecast data. The assessment using relative root-mean-square-error was taken for the last month SST of each experiment. Compared to the CFSv2, the OMIDAS revealed a better prediction skill for the Korea seas SST, particularly in the Yellow sea mainly due to a more realistic representation of the topography and current systems. Seasonally, the OMIDAS showed better predictability in the warm seasons (spring and summer) than in the cold seasons (fall and winter), suggesting seasonal dependency in predictability of the Korea seas. In addition, the mid-range predictability for the Korea seas significantly varies depending on regions: the predictability was higher in the East Sea than in the Yellow Sea. The improvement in the seasonal predictability for the Korea seas by OMIDAS highlights the importance of a regional ocean modeling system for a medium-range marine prediction.

• Journal of Fisheries and Marine Sciences Education
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• v.26 no.5
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• pp.941-958
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• 2014

Today the educational authorities selected 38 Meister High Schools which are based on industry demand out of 691 high schools nationwide to make the vocational high schools do their original purposes and to innovate vocation education. The purposes of this study are to analyze the relationship between the school environment and career maturity and the school adjustment resilience and, based on the results, to suggest improvement plans to improve business environment for the maritime Meister High Schools. To analyze the influence of the school environment and students' career maturity on their school adjustment resilience, the researcher used the teachers's professionalism, school facilities, students' entrance motivation, career guidance depending on the individual and the school meal quality as the school environment factors of the independent factors. As dependent factors, the researcher selected school environment, teachers, class preparation of the individual, level of school life such as an attitude level and school rule observance, and peer relation.