• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.230-232
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• 2019

There is an accelerating need for ocean sensing where autonomous vehicles can play a key role in assisting engineers, researcher and scientists with environmental monitoring and collecting oceanographic data. This paper is performed to develops an autonomous sailing drone to be used as a sensor carrying platform for autonomous data acquisition at Sea. From a sailing drone design viewpoint, it is important to establish reliable prediction methods for sailing drone's resistance. The required power for the propulsion unit depends on the ship resistance and speed. There are three solutions for the prediction of ship resistance as follow analytical methods, model tests in tanks and Computational Fluid Dynamics (CFD). The present paper aims at simulating sailing drone friction resistance using numerical method. The dynamic mesh motion is used to describe the sailing drone movement.

• Journal of Advanced Navigation Technology
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• v.27 no.3
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• pp.287-292
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• 2023

In the case of fixed CCTV, there is a problem in that a shadow area occurs, even if the visible range is maximized by utilizing the pan-tilt and zoom functions. The representative solution for that problem is that a plurality of fixed CCTVs are used. This requires a large amount of additional equipment (e.g., wires, facilities, monitors, etc.) proportional to the number of the CCTVs. Another solution is to use drones that are equipped with cameras and fly. However, Drone's operation time is much short. In order to extend the time, we can use multiple drones and can fly one by one. In this case, drones that need to recharge their batteries re-enter into a ready state at the drone port for next operation. In this paper, we propose a system for precised positioning and stable landing on the drone port by utilizing a small drone equipped with a fixed forward-facing monocular camera. For our conclusion, we implement our proposed system, operate, and finally verify our feasibility.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.108-110
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• 2018

항공 드론의 비약적 발전에 비해 소형 선박을 이용한 Sail Drone의 기술 개발은 이제 막 초보적인 수준을 벗어나, 해양과학 조사에 이용되고 있는 추세이다. Sail Drone은 항공드론으로는 할 수 없는 해양의 조류, 해수 온도, 염분 농도 및 염분의 비중, 오염 해역의 측정과 어류의 분포 등 다양한 해양과학 자료의 조사뿐만 아니라, 선형 및 사용 용도를 변경하면 군사적으로도 적지의 관찰과 적 잠수함의 추적, 공격목표물에 대한 충돌 폭파, 아군의 미사일 등 전략무기의 공격 목표(Target) 등 다양한 방법으로 이용 할 수 있다. 추진동력을 얻기 위한 재생에너지 기술, 해양과학 Sensor의 설치 및 이용에 관한 기술, 획득한 정보의 전송 및 판독에 관한 기술, 무인 항행 조정 기술, GPS를 포함한 위치정보 이용 기술 등 복합적이고도 융합적인 기술이 요구되는 Sail Dronen 개발에 앞서 무인 제어선박을 연구하였다.

• IEMEK Journal of Embedded Systems and Applications
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• v.16 no.4
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• pp.129-136
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• 2021

River facilities and port structures require a regular inspection and diagnosis due to obsolescence. Currently, most river facilities are undergoing indirect inspection and diagnosis by divers. The underwater inspections are not feasible due to safety issues of divers and restrictions on working hours and environment. To overcome these issues, it is intended to conduct inspections of river facilities using underwater drones. In this research, an underwater ROV (Remote Operated Vehicle) has been developed, which is a kind of drone with propellers. As a key device of this research, an injection device has been attached to the underwater drone to conduct an operation test, a stable operation test of an underwater drone, and a test of attached sensors. The river facility inspection can be carried out optimally using the hovering control of the drone and injection systems. With the developed ROV system, hovering test and injection test have been performed to verify the feasibility of this development.

• Journal of Navigation and Port Research
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• v.48 no.4
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• pp.261-266
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• 2024

As the number of passenger ship users increases each year, the importance of traffic safety for passenger ship routes is becoming more prominent. A passenger ship is a multi-use vessel frequented by numerous individuals, and special attention to safety is imperative. To prevent and mitigate large-scale damage, preparedness for marine traffic accidents is crucial. Although significant efforts are being made to reduce accidents caused by floating objects in the ocean, such incidents have not significantly decreased. This study presents the results of a theoretical review on the technology for identifying floating objects using hyperspectral cameras. The effectiveness and usability of drone technology were also assessed. Additionally, the functionalities of polarization filters and hyperspectral cameras were evaluated. The study concluded that hyperspectral imaging technology is applicable for identifying floating objects and that future research should measure the degree of light reflection at sea level and further explore the inherent light wavelength emissions from these objects.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.362-365
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• 2022

With the development of the 4th industrial revolution technology, smartization in various fields is accelerating. The shipping and logistics industry is also promoting smartization by combining advanced new technologies such as digital twin, Internet of Things, and artificial intelligence. In Korea, the Ministry of Maritime Affairs and Fisheries is promoting a strategy to spread the smart shipping logistics system in line with the changing global shipping logistics trend, and through this, it is creating a foundation for smart shipping logistics. This study aims to present the concept of a communication tool that recognizes the importance of communication between each logistics entity and exchanges opinions between logistics entities in a virtual digital twin environment to cope with the changing shipping logistics process. In addition, for the development of these communication tools, this study derive a software design model, including architecture.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.7
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• pp.1059-1066
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• 2021

In Korea, the importance of marine activities is great, and automatic weather observation facilities are operating on land to investigate abnormal weather phenomena caused by industrialization; however, the number of facilities at sea is insufficient. Marine survey ships are operated to establish marine safety information, but there are many places where marine survey ships are difficult to access and operating costs are high. Therefore, a small, unmanned vessel capable of marine surveys must be developed. The sail has a significant impact on the sailing performance, so much research has been conducted. In this study, the camber effect, which is a design variable of the twin curvy sail known to have higher aerodynamic performance than existing airfoil shapes, was investigated. Flow analysis results for five cases with different camber sizes show that the lift coefficient is highest when the camber size is 9%. Curvy twin sails had the highest lift coefficient at an angle of attack of 23° because of the interaction of the port and starboard sails. The port sail had the highest lift coef icient at an angle of attack of 20°, and the starboard sail had the lowest lift coef icient at an angle of attack of 15°. In addition, the curvy twin sail had a higher lift coefficient than NACA 0018 at all angles of attack.

• Journal of Navigation and Port Research
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• v.44 no.6
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• pp.557-563
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• 2020

Digital Twin Technology is currently being utilized in many industries and logistics seems soon to follow that trend. Currently, technology introduction to container terminals is restrictedly developing. In reviewing the existing literature, it became clear that research on the application of Digital Twin technology for container terminals is deficient. This study fulfilled AHP and IPA analysis causing fields to adjust priority at the container terminal. The result of analysis on the urgent necessity of adjustable fields' detailed elements from Digital Twin Technology, ATC, intelligent CCTV, and container yards, and showed that they were of the highest priority level. Also, VR/AR Equipment, AYT, Smart Container, Automated Container Delivery Facility, Refrigerated/Freezer Container, Wearable Device for Port Maintenance, and Smart Buoy were reviewed in detail. Our group suggests AQC, Berth, AGV, ASC, Apron, and Automated Mooring as potentially useful Digital Twin Technologies. Finally, our research suggests the OSS equipment, intermodal linkage facility, intelligent drone, and hazardous material storage are areas of low priority.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.1118-1121
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• 2020

전체 해양 사고 원인 중 선박 운항 부주의가 34%로 사고 발생 원인 중 대다수를 차지한다. 해당 문제를 해결하기 위해서는 선박 운항자를 대상으로 효과적인 운항 교육 및 실시간 관제 시스템을 제공해 사고를 방지하는 것이 중요하다. 따라서 울산항만을 현실적으로 반영한 가상현실 시물레이션 및 5g 수상드론을 이용한 운항 교육 시스템과 모든 선박들이 사용가능한 실시간 관제 시스템을 연구하고 이를 울산 항만에 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.1065-1067
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• 2022

울산항에서 일어나는 선박사고를 줄이고자 실제 산업환경정보를 수집하여 관제서버로 전송할 수 있는 기능을 갖춘 수상드론과 소형선박 운항자들을 대상으로 제작된 메타환경에서의 모의 운항을 할 수 있는 시뮬레이터를 제작하여 안전한 산업환경을 만들기 위해 복합적인 항만 안전운항관리 솔루션을 구축하고자 한다.