• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.229-238
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• 2022

This paper addresses on the International technical trends, standards, and development status of terrestrial radionavigation system to provide more accurate and fail-safe Positioning, Navigation, and Timing (PNT) Information available in maritime navigation environment. We analyze the performance result of pilot service in enhanced Long range navigation (eLoran) testbed environment using Low Frequency (LF) signal, and describe the development status of Ranging-Mode (R-Mode) system using Medium Frequency (MF) and Very High Frequency (VHF) to meet the Harbor Entrances and Approaches (HEA) requirement of International Maritime Organization (IMO) within 10m position accuracy. Furthermore, we present an architecture for integrated service of satellite-terrestrial navigation system and future maritime applicable fields. As the core information infrastructure of future navigation for 4th industrial revolution, this paper will be contributed to determining the direction of present and future to provide fail-safe PNT service with Global Navigation Satellite System (GNSS) based on the technical enhancement of terrestrial integrated navigation system.

• 한국항해항만학회지
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• 제47권6호
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• pp.341-349
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• 2023

부산항의 주요 3대 항구인 감천항은 잡화, 어획물, 철재, 시멘트 등 다양한 화물의 적양하 및 환적을 위해 운영되고 있다. 그리고 도선법에 따른 강제 도선구로, 선박의 입출항 시 관련법에 따라 도선사에 의하여 도선 되고 있다. 감천항의 해상교통환경에 대한 몇몇 학술적 연구가 있었으나, 도선환경과 도선안전 위해요소에 관한 연구는 전무 한 상태였다. 본 연구에서는 감천항 도선구의 도선환경 및 도선안전위해요소에 대하여 살펴보았고, 손상된 도선사 승하선 설비를 포함한 선박의 설비가 불량한 선박, 선박의 구조물이나 어구 등에 의하여 도선사의 시야를 제한하는 선박, 영어로 의사소통이 불가한 선박, VTS의 지시를 따르지 않는 선박 등의 도선안전위해요소들이 있음을 확인했다. 또한 AHP 기법에 기반한 부산항도선사에 대한 설문을 통하여 도선안전위해요소들을 계층화하여 중요도를 확인하고, 감천항 입출항 선박들의 안전한 도선 방안에 대하여 제시하였다.

• Membrane and Water Treatment
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• 제13권1호
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• pp.1-6
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• 2022

The regulations of the International Maritime Organization (IMO) have been steadily strengthened in ship emissions. Accordingly, there is a growing need for development of related technologies for the removal of contaminants that may occur during the treatment of SOx and NOx using a wet scrubber. However, this system also leads to wastewater production when the exhaust gas is scrubbed. In this research, we evaluated the performance of an ion selective resin process in accordance with scrubber wastewater discharge regulations, specifically nitrate discharge, by the IMO. Accelerated real and synthetic wastewater of wet scrubbers, contained high amounts of TDS with high nitrate, is used as feed water in lab scale systems. Furthermore, a pilot scale dissolved air flotation (DAF) using microbubble generator with ion exchange resin process was combined and developed in order to apply for the treatment of wet scrubber wastewater. The results of the present study revealed that operating conditions, such as resin property, bed volume (BV), and inlet wastewater flow rate, significantly affect the removal performance. Finally, through a pilot test, DAF with ion exchange resin process showed a noticeable improvement of the nitrate removal rate compared to the single DAF process.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2023년도 춘계학술대회
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• pp.142-143
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• 2023

A contact accident with gantry cranes involving the container ship MV Milano Bridge in Busan New Port took place on 6 April 2020. The report concluded that the pilot unreasonably piloted the ship with impaired maneuverability and without a proper pilotage plan. Analyzing the entire system by CAST model gives a holistic approach in linking all the key components and their roles as well as violations that led to the accident, stepping away from placing the blame on only one component in the system. Furthermore, analyzing the accident as an system theory gives a clear overview of the relationships between system components and how these interactions led to the accident.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2022년도 추계학술대회
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• pp.149-150
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• 2022

항만 계류시설에 작용하는 접안력은 접안에너지에 근거하여 계산하게 된다. 접안력을 결정하는 절대적인 요소로서 현장에서 안전한 도선을 위해 주의해야 할 것이 바로 '선박접안속도'이다. 본 연구에서는 선박접안속도 관련 국내외 동향을 살펴보고, 안전하고 효율적인 부두설계 및 도선운영을 위한 기초자료로 활용하고자 국내부두에서 접안속도 실측데이터를 통계적 수단 및 알고리즘을 통해 분석하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 SMICS 2004 International Symposium on Maritime and Communication Sciences
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• pp.43-48
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• 2004

A pilot-scale system of 20t/h for the treatment of ship's ballast water and the setup of dissolved hydroxyl radical was introduced in this paper. With this experimental system, the kill efficiencies of bacteria, mono-algae, protozoan reach 100% within 2.67s when dissolved OHㆍconcentration is 0.6mg/L. At the same time, the effect of hydroxyl radicals on the photosynthesis pigments of phytoplankton was done. The results indicate that the contents of chi-a, chl-b, chl-c and carotenoid are decreased to 35~64% within 8.0s further to the lowest limit of test after 5 minutes. When dissolved OHㆍratio concentration is 0.68mg/L, the attenuation efficiencies of photosynthesis pigment are 100%. Therefore the invasive marine species can be killed in the process of the inputting and discharge ship's ballast water.

• 해양환경안전학회지
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• 제21권5호
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• pp.507-514
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• 2015

본 연구는 평택항 도선구 주변해역의 해상교통 시스템 개선방안을 찾고자 하는 연구로서, 평택항의 도선사와 기항 선박 선장들의 전문가적 시각에서 평택항 도선구 주변의 교통환경을 분석하였다. 또한 장안서 도선사 승하선 구간과 입파 도선사 승하선 구간의 위해요소를 실증적인 관점에서 분석하여 다음과 같은 해상교통시스템 개선 방안을 제안하였다. 먼저 목덕도 분리수도와 안도수역에 분리수도 설정을 제안하였고, 장안서 분리수도의 폭을 조정하여 혼잡도를 개선함은 물론 분리수도 외측경계선에 등부표를 설치하여 어구가 침범하지 못하도록 제안하였다. 또한 장안서 입파도 구간 해역에 교통안전 특정해역을 설정하도록 제안하고, 입파도 정박지 및 장안서 정박지 확충을 제시함으로서, 이러한 교통시스템 개선을 통하여 평택항 도선구 주변 통항선박의 안전운항 증진방안을 기대할 수 있을 것으로 기대된다.

• 해양환경안전학회지
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• 제13권2호
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• pp.161-167
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• 2007

이 논문은 선박의 자동조타장치를 음성인식으로 제어할 수 있는 시스템을 개발하기 위한 기초연구로 SMCP(IMO Standard Marine Communication Phrases)에 제시된 조타명령문의 구성 형태를 분석하여 화자의 의도를 예측할 수 있는 특정 파라미터를 추출하였다. 그리고 이 파라미터를 이용하여 1차 패턴인식 과정으로부터 도출된 후보단어 집합으로부터 최종 단어를 결정하는 후처리 인식 프로시저를 설계하였다. 이 프로시저의 유용성을 검증하기 위하여 음성인식용으로 총 525개의 조타명령문을 획득하였고, 표준패턴 기반의 인식과정 인식률과의 비교실험을 수행하였다. 실험결과 의도예측 특정 파라미터를 이용한 인식 프로시저의 인식률이 약 42.3% 향상되어 유효함을 알 수 있었다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 SMICS 2004 International Symposium on Maritime and Communication Sciences
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• pp.38-42
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• 2004

A pilot-scale experiment for the treatment of red tide in the enclosure was done in sea area of Shandong Province, P. R. China on Aug. 25, 2002. With the method of strong dielectric barrier discharge in microgap, $O_2$in air and $H_2O$ in seawater are ionized and dissociated into large numbers of OHㆍradicals, and then dissolved into a part of seawater to form OHㆍsolution of high concentration. With OH' concentration of 0.68mg/L, the kill efficiencies of 29 kinds of red tide organisms such as Chaetoceros lorenzianus and so on reached 99.89%, in which the kill efficiencies of bacterium and vibrio were 100%, and that of Gonyaulax cysts and Prei. Cysts were up to 100%. At the same time, the content of chlorophyll-a was decreased into the lowest limit of test. DO saturation of seawater was greatly increased to 100% because the residual OHㆍradical was decomposed into $H_2O$ and $O_2$after 20 minutes, Therefore the treatment of red tide using OHㆍradicals is a kind of advanced oxidation technology, which realizes zero pollution, zero emission and zero residual in the process of the production of OHㆍradicals and the treatment of red tide.

• 수산해양기술연구
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• 제54권3호
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• pp.231-238
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• 2018

In this study, a ship motion control system design method is introduced for autonomous ships. Some related research results and technologies for autonomous ships have already been developed and applied to ships. For example, the Norwegian Maritime Authority and the Coastal Administration have signed an agreement that allows to test of autonomous ships in the defined area (port to port). Many countries and industries are pursuing to realize the autonomous vessel in the real world. In this paper, the authors try to develop related technology. As basic research, a ship model of the pilot vessel is developed and physical parameters are identified by experiment and simulations. Using the mathematical ship model, a control system is designed and control performance is evaluated by simulations.