• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2000.10b
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• pp.45-49
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• 2000

The paper deals with the implementation of prototype Risk Visualization Sytem (RVS). The RVS is one of the sub-system of Risk Management System (RMS) of National Maritime Police Agency in Korea. In this work, prototype RVS was constructed with virtual reality techniques. Using the prototype RVS, we carried out some performance tests for the various environmental conditions at sea. As results from tests, the prototype RVS can provide immersible virtual world. The results gave rise to the user interaction with 3D objects that give realistic reproduction of sear environments. Thus, we found that the prototype RVS should be a immersible visualization system of Risk Management System.

• Journal of the Korean Society of Marine Environment & Safety
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• v.8 no.1
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• pp.89-100
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• 2002

Organizational development aims to improve the performance of the organization.

• Proceedings of KOSOMES biannual meeting
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• 2001.05a
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• pp.169-183
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• 2001

• Proceedings of KOSOMES biannual meeting
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• 2005.05a
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• pp.97-109
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• 2005

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2004.11a
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• pp.67-67
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• 2004

• Journal of Navigation and Port Research
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• v.37 no.4
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• pp.391-400
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• 2013

Each country has recently established and operated so called Aids to Navigation(AtoN) AIS system collecting and transferring information on the sea state and AtoN's position. Korea has also decided to introduce the system and been establishing it. And it has already installed and operated this system in Incheon and Daesan. For the purpose of giving the national standards of AtoN AIS, this paper is to investigate the present states of AtoN AIS systems in the above two area and to suggest the improvement to the operation of AtoN AIS system. To make it, the paper deals with the international regulations of related AtoN AIS and the cases of foreign's AtoN AIS system installed and also investigates the operation states of the system, in five modules such as system management, system composition, information, function and cooperation. The followings are concluded; improving the inconsistency of system management, reducing operator's confusion caused by excessive display of AtoN AIS system, improving the problem of receiving unnecessary information, improving the functional problems caused by AIS communication inability and improving AtoN AIS information which is presently not used on board.

• Proceedings of KOSOMES biannual meeting
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• 2006.05a
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• pp.7-13
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• 2006

On the analysis of maritime security awareness of people who engage in the fields of domestic passenger ships, the security code is proposed in order to prevent and to response threats of security in the domestic passenger ships.

• Proceedings of KOSOMES biannual meeting
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• 2007.05a
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• pp.141-147
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• 2007

In order to provide the tailored maritime administration service for fishermen, the Korea coast guard services related to fishermen are analyzed. The familiarity of fishermen with the services is made up questions and analyzed. The programs to enhance perception, kindness, satisfaction, reliability on the services are proposed.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.47 no.3
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• pp.234-240
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• 2011

In order to obtain the fundamental data about the behavior of sharks by underwater audible sound, this experiment was carried out to investigate the auditory characteristics of tiger shark Scyliorhinus torazame which was caught in the coast of Jeju Island by heart rate conditioning method using pure tones coupled with a delayed electric shock. The audible range of tiger shark extended from 80Hz to 300Hz with a peak sensitivity at 80Hz including less sensitivity at 300Hz. The mean auditory thresholds of tiger shark at the frequencies of 80Hz, 100Hz, 200Hz and 300Hz were 90dB, 103dB, 94dB and 115dB, respectively. The positive response of tiger shark was not evident after the sound projection of over 300Hz. At the results, the sensitive frequency range of tiger shark is narrower than that of fish that has swim bladder. In addition, it is assumed that the most sensitive frequency in auditory thresholds of Chondrichthyes is lower than that of Osteichthyes. Critical ratios of tiger shark measured in the presence of masking noise in the spectrum level range of about 60-70dB (0dB re $1{\mu}Pa/\sqrt{Hz}$) increased from minimum 27dB to maximum 39dB at test frequencies of 80-200Hz. The noise spectrum level at the start of masking was distributed at the range of about 65dB within 80-200Hz.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.53 no.2
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• pp.132-141
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• 2017

The objective of this study was to provide fundamental information on fish swimming behavioral properties. Acoustic data was collected at nighttime from the $10^{th}$ to $12^{th}$ March, 2016 near Yokji Island in the South Sea of South Korea, and was analyzed using the fish track technique. This technique is to identify groups of single targets, which shows a pattern of systematic movement. As a result, the differences of the behavioral properties such as depth, swimming speed, vertical direction, horizontal direction, tortuosity, and depth change among days were minor; however, statistical results (Welch analysis of variance) showed significant difference between days. Especially, the target strength (TS) of the $11^{th}$ were significantly different from the $10^{th}$ and $12^{th}$. It could be assumed that gizzard shad, which was the dominant species from the catch on the $11^{th}$ March, might have affected this difference. The correlation between TS and other properties was very week. The significant difference seemed even small differences of average values because of the large data volume.