• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.432-434
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• 2022

자율운항선박 수용에 따른 화물 컨테이너 도착 및 항만에서의 화물 상태에 대한 데이터 흐름을 제공하여 화물 양·적하 및 선박 입출항 지원 서비스 개발을 통해 자율운항선박과 터미널 간의 화물 양·적하 작업과 입출항 작업에 대한 지원 시스템을 제공함으로서 화물의 물동량과 양·적하 효율 및 선석 운영효율을 최대화하고, 이에 더불어 자율운항선박의 선적정보 교환을 통한 양·적하 작업의 오류가능성과 자동화된 양·적하 지원을 통한 선박의 정박비용을 최소화하여 글로벌 공급 체인의 복잡성을 최소화하고 항만물류비용을 감소시키는데 기여하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.214-215
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• 2021

안전운항지원을 위한 항만물류 프로세스와의 정보 연계 플랫폼 개발 및 화물 적재량 증가 및 물류비용 감소를 위한 최적의 양·적하 및 선박 입출항 지원 서비스 어플리케이션 개발을 목표로 한다.

• Journal of Korea Port Economic Association
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• v.39 no.4
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• pp.295-308
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• 2023

Busan Port, as Korea's representative trading port, handles a variety of port cargo from bulk cargo to container cargo. Busan Port is currently functioning as a container specialized port for North Port and Busan New Port, and Gamcheon Port is also handling container cargo mainly in bulk cargo. This study intends to examine the overlapping cargoes and specialized cargoes between these ports and Busan Port as the amount of import and export cargoes in ports designated as trade ports in Korea is increasing. In order to understand the characteristics of the major cargoes handled in the port, the quantitative change is confirmed through the total cargo volume of major domestic ports and the trend of changes in import/export cargo between Busan Port and major ports is analyzed. There are many specialized investigation methods, but as the most basic method, we will examine quantitative changes and causes by simply examining the data for 10 years as the amount of change by cargo. In addition, the causes of these fluctuations should be reclassified into domestic and foreign causes by identifying changes in customers in different ports and shipping volumes, changes in consumption areas, and transshipment volumes. Through the analysis of the major cargo volume of each port, the characteristics and fluctuation trends of major cargo handled in Busan Port and other ports are identified, and the competitive cargoes of each port are verified. Through this, the characteristics and competitiveness of the port are inferred, and implications for the cargo volume of Busan Port and future countermeasures are suggested.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.268-270
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• 2022

자율운항선박의 관리 및 운영에 필요한 선대 자산관리플랫폼, 영상기반 선박 상태검사기술, 안전운항지원 6종 서비스에 대한 기술개발 논문이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.219-220
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• 2021

자율운항 선박 지원 6종 서비스는 인공지능 센서 기반 선박 접/이안 및 계류지원 서비스, 화물 양적하 및 선박 입출항 지원, 선박과 터미널 간 실시간 정보 교류를 통한 운항정보 동기화, PSC 점검지원, 선박의 주요 기기를 육상 시범운영센터에서 표출하는 상태모니터링 지원 서비스, 해양사고 발생 시 신속한 조치을 위한 사고 대응지원 서비스로 구성되어 있다. 이 연구에서는 개발되는 6종 서비스 성능검증이 원활히 수행될 수 있도록 육상과 실선박에 설치되어야 하는 장비, 선박과 육상서비스 센터의 데이터 전송을 위한 네트워크 인프라 그리고 종합 상황실 역할의 육상 시범운영센터를 구축하여 안전운항을 위해 6종서비스가 이루어 져야한다.

• Journal of the Korea Society of Computer and Information
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• v.26 no.7
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• pp.127-132
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• 2021

This paper applies a machine learning model to forecasting freight rates in dry bulk and tanker markets with wavelet decomposition and empirical mode decomposition because they can refect both information scattered in the time and frequency domain. The decomposition with wavelet is outperformed for the dry bulk market, and EMD is the more proper model in the tanker market. This result provides market players with a practical short-term forecasting method. This study contributes to expanding a variety of predictive methodologies for one of the highly volatile markets. Furthermore, the proposed model is expected to improve the quality of decision-making in spot freight trading, which is the most frequent transaction in the shipping industry.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.33-36
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• 2003

해양생물은 매우 다양하고 양적으로도 풍부하며, 지구상의 전체 동물 중 약 80%가 바다에 서식하고 있는 것으로 알려져 있다. 바다 속에 살고 있는 3만종 이상의 어류를 포함한 해양자원은 육상 생물자원의 부족량을 보완할 수 있는 생물자원으로 인간의 3대 영양소인 단백질, 지방 및 탄수화물의 공급원으로서 식품산업뿐만 아니라 건강기능성 식품 및 의약산업분야에서의 원료로서도 그 중요성이 점점 높아지고 있다. (중략)

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.4D
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• pp.323-330
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• 2010

The time in port for vessels is one of the important factors for analyzing the operation status and the capacity of ports. In addition, the time in port for vessels can be directly used for estimating the greenhouse gas emissions resulted from vessels in port. However, it is unclear which variables can affect the time in port for vessels and what the marginal effect of each variable is. With these challenges in mind, the study analyzes the time in port for vessels arriving and departing port of Busan by using a parametric survival model. The results show that the log-logistic accelerated failure time model is appropriate to explain the time in port for 19,167 vessels arriving and departing port of Busan in 2008, in which the time in port is significantly affected by gross tonnage of vessels, service capacity of terminal, and vessel type. This study also shows that the greenhouse gas emission resulted from full-container vessels, which accounted for about 61% of all vessels with loading/unloading purpose arriving and departing port of Busan in 2008, is about "17 ton/vessel" in the boundary of port of Busan. However, the hotelling greenhouse gas emissions resulted from non-container vessels (3,774 vessels; 20%) are greater than those from the full-container vessels. Hence, it is necessary to take into account more efficient port management polices and technologies to reduce the service time of non-container vessels in port of Busan.

• Journal of The Korean Society of Grassland and Forage Science
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• v.13 no.1
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• pp.7-15
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• 1993

Nitrogenous and non structural carbohydrate compounds in the remaining tissues of 10 weeks old alfalfa (Medicago sativa L.) grown in hydroponic culture, were analysed during 24 days of regrowth following shoot removal. The dry weights of the remaining organs were not significantly changed for 10 days following shoot removal. Compared with uncut plants, defoliation drastically depressed root growth, in particular that of taproot. During 6 days of regrowth, nitrogen contents in all remaning organs significantly decreased. Nitrogen loss in this period was pronounced in root system. Nitrogen contents in each organ after 24 days of regrowth in defoliated plant were recovered completely or exceeded initial level. Amino acid-N was the most readily available form of nitrogen while protein-N was the largest storage pool. The tap root contained about 51.0% and 33.4%, respectively, of the total starch and total ethanol-soluble sugar contents. The starch content of tap roots initially exceeded 40.7 mg. plant$^{-1}$ (day 0), and then declined to the minimum level on day 14. This result clearly showed that the tap root is the major storage site for metabolizable nitrogen (protein-N and amino acid-N) and carbohydrate(starch), and that the degradation of these researves occur much actively in the early period of regrowth.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.163-164
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• 2020

Along with the increase in global volume of goods, logistics companies are trying to reduce costs by increasing the size of ships carrying cargo, increasing the efficiency of quantitative equipment at ports, and unmanned electric vehicles on land. Korean naval ports are also facing the same situation as the global trend. In the past, small and medium-sized ships such as FF, PCC, and beheaded eagles are being retired for their longevity, and their positions are being replaced by large ships such as KDX, FFG, and LST-II. In particular, large ships such as Dokdo and the next light aircraft carriers are also being prepared. Unlike general merchant ships, naval ships require periodic inspections and preventive maintenance, so repair piers such as maintenance depots are in operation. The naval maintenance depot mainly uses trailers, trucks, and truck-type cranes to carry out loading and unloading of heavy ships, and the application or development of automation and unmanned equipment performed by the private sector is inadequate, and self-improvement cases are also very weak. This study aims to improve the efficiency of the military logistics system through research on the logistics system such as transport, storage and unloading of heavy goods and maintenance products of naval ships.