• Journal of Navigation and Port Research
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• v.30 no.10 s.116
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• pp.825-831
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• 2006

This research does by purpose that present safe navigation plan for ships during doing dredging construction with dredger crossing waterway of Gadeok Dredging operations need to build sunken tunnel that cross the bottom of the sea under waterway of Gadeok for access road construction between Busan- Geoje. Accordingly, dredger must cross and dredge waterway of Gadeok fatally. There is possibility of marine accident of collision for latent danger situation of ships to navigate waterway of Gadeok relatively. Therefore, safe navigation plan of ship is groped in reply and its countermeasure is presented. Firstly, navigating traffic in daytime was forecasted less than 20% of its maximum capacity through estimating the traffic volume and traffic congestion The proposal was presented to execute dredging operations in three-step and to establish temporary waterway after reviewing waterway design principles. The role of VTS center was emphasized in the new Busan Port, lastly.

• Journal of Korea Port Economic Association
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• v.33 no.3
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• pp.53-68
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• 2017

The purpose of this study is to develop a new Korean container freight index by applying weights based on the global trade volume. To achieve this, it was decided to determine the conditions such as establishment of routes and regions, weighting of trade volumes which based on prior research and expert advice. Based on this, the individual index and regional index and composite index were calculated, and then reliability and statistical significance of the index was verified through correlation analysis and Granger causality analyses. This study suggest the following findings, through the development of the Korean container freight index. Firstly, Korean freight index reflects the overall market situation and can be used as a benchmark for determining the conditions of each market, consisting of criteria of region and routes. Secondly, it is possible to reflect the market conditions in which actual freight differences exist, since it has developed separate indexes for export and import routes. Finally, The composite index is the only index that reflects not only exports and imports but also 27 individual routes based on Busan, which is the most comprehensive indicator of the korean container freight market.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.263-265
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• 2007

최근 지자체별로 민간투자에 의한 사회기반시설 확충을 추진하고, 육상의 도로망을 직선화 및 최적화 하기 위해 항만 및 주요 항로를 횡단하는 해상교량 건설이 활발히 추진되고 있다. 하지만 경제적인 측면만을 고려하여 계획함으로써, 장래 항만 발전과 해상교통안전 확보에 지장을 초래할 가능성이 크다. 아울러 장래 항만발전과 항만이용 안전에 미치는 영향이 지대함에도 항만운영 및 해상교통안전 확보관점에서 제시된 해상교량 건설기준이 없어, 교량규모 결정시 이해당사자간 갈등이 반복되고 있는 설정이다. 이에 본 연구에서는 현행 국내 해상교량 건설에 따른 문제점 및 기준설정의 필요성을 사례분석을 통해 제시한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.2
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• pp.821-828
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• 2011

This paper developed the algorithm for improving the performance the auto pilot in the autonomous vehicle system consisting of the Track keeping control, the Automatic steering, and the Automatic mooring control. The automatic steering is the control device that could save the voyage distance and cost of fuel by reducing the unnecessary burden of driving due to the continuous artificial navigation, and avoiding the route deviation. During the step of the ship autonomic navigation control, since the wind power or the tidal force could make the ship deviate from the fixed course, the automatic steering calculates the difference between actual sailing line and the set course to keep the ship sailing in the vicinity of intended course. first, we could get the transfer function for the modeling of ship according to the Nomoto model. Considering the maneuverability, we propose it as linear model with only 4 degree of freedoms to present the heading angle response to the input of rudder angle. In this paper, the model of ship is derived from the simplified Nomoto model. Since the proposed model considers the maximum angle and rudder rate of the ship auto pilot and also designs the Fuzzy controller based on existing PID controller, the performance of the steering machine is well improved.

• Journal of Navigation and Port Research
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• v.39 no.3
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• pp.217-222
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• 2015

In this research, sea routes of domestic coaster liners between 2005 and 2013 were studied via social network analysis. Study of the sea routes revealed that they follow power-law in a scale-free form, a characteristic found often in social network. We have looked into centrality, which is a major standard in the field of social network analysis. We have also analyzed the annual changing trend in the centrality of the connectivity, examined the effect of quantity through the comparison with the original quantitative analysis method, and lastly, verified the relationship between the centrality of connectivity and mediation. Then, we were able to identify ports according to priority using these factors. This research assumed and interpreted the coaster liners route as a single network and suggested useful results. Based on these results, directing of development of domestic coaster liners route development and other factors will be achieved more smoothly. And if we utilize social network analysis method in other various fields - for example, the centrality of airport and the diplomatic realations analysis of the neighboring country - we will be able to effectively analyze events in diverse perspectives.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.2
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• pp.171-178
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• 2015

This research is the first research on developing the speed limit select model and also it is the result of the research on the importance of each element and consideration factors when selecting the speed limit. For the consideration factor discrimination and calculation of the importance, the delphi method and AHP method was used. The delphi survey was processed through third round survey, 5 high consideration factor(Level 1) and 23 low consideration factor(Level 2) was discriminated. During the process of the third delphi survey, when the CVR cost was in the range between 0.4~1.0 it was treated as the consideration factor when selecting the speed limit and less than 0.4 cost was eliminated. In the process of the second delphi survey, 33 consideration factors were discriminated but was reordered into 23 categories through the third survey. Based on the 23 categories earned through the third delphi analysis, the AHP survey was processed. The result of the AHP survey was that out of the importance of the 5 high consideration factor(Level 1), the traffic condition was evaluated as the number one factor and the vessel condition, waterway condition, environment condition, supporting condition and etc. conditions were evaluated following the traffic condition. Out of the 23 low consideration factor(Level 2) consideration, the visibility was evaluated to be the first important and the performance of the vessel steering, objective factors within the harbor, amount of traffic and density, distance between the passing vessel, speed of the steering capacity and tidal current were the following evaluated factors.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.27-29
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• 2018

ISM Code, CSM 따라 절차 및 문서를 표준화하고 자동화하여 멀티미디어 콘텐츠로 시각화하여 모바일 및 PC등 디지털 디바이스로 제공하고 알림을 통해 선원들에게 좀 더 절차가 단순화되고 편리한 문서 자동화 시스템을 개발 알림을 통해 선원들에게 좀 더 절차가 단순화되고 편리한 문서 자동화 시스템을 개발하고 있으며, 전자해도 기반의 좀 더 정확학고 실용적인 안전관리 방법을 연구.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.10a
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• pp.367-369
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• 2014

대한민국에 근대적인 항로표지가 처음으로 개설된 이래 지난 2003년에는 대한민국 등대 100주년을 맞이하여 '유인등대 해양문화공간 조성계획'을 수립하고 유인등대 시설보완 및 개방, 등대 박물관 확장 개관 등을 실시하였다. 이러한 다각도의 노력은 폭발적인 성과를 거두어 2001년 한 해 동안 유인등대를 다녀간 방문객이 공식적으로 기록된 것만 300만 명이 넘게 되었다. 이후 대한민국의 등대는 40여 개의 유인등대와 60여 개의 무인등대가 널리 알려지게 되었고 문화적 가치를 인정받아 현재 23개의 등대가 등대문화유산으로 지정되었으며 지속적으로 발굴하고 있다. 대한민국의 등대가 많은 국민들의 관심 속에서 방문객이 지속적으로 늘어나면서 특히 유인등대는 해양문화공간으로서의 기능이 요구되었고 향후로도 더욱 가속화될 전망이다. 이러한 맥락에서 본 연구는 대한민국 유인등대의 친수문화적 특성을 체계적으로 살펴보고 그에 따라 해양문화공간의 조성 방향을 적절하게 설정할 수 있도록 하기 위한 기본적인 지침을 설정하는 것을 목적으로 한다.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.1
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• pp.78-85
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• 2014

The Mu-communication board supported by hybrid communication is designed with Cortex M3, which is a low power energy consumption 32-bit microcontroller. The Cortex M3 microcontroller has UART(Universal asynchronous receiver/transmitter) ports which can set appropriately using the command line interpreter (CLI) program with each port. URAT ports are used for hybrid communication modems, GPS modules, etc. When the socket type was compared with the short message service type, the socket type was proven to be better. By improving the receiving performance in the control and management system of the AtoN, data loss was minimized. During the testing of the socket and SMS, data was collected from each buoy for 12 hours every 1 minute and the receiving rate of the data was found to be more than 98.58 % and 99.42 % respectively.

• Spatial Information Research
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• v.15 no.4
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• pp.363-370
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• 2007

This study has been carried for the development of the basic algorithm of helicopter navigation system based on TRN (Terrain Referenced Navigation) with information input from the GPS. The helicopter determines flight path due to Origination-Destination analysis on the Cartesian coordinate system of 3-D DTM. This system shows 3-D mesh map and the O-D flight path profile for the pilot's acknowledgement of the terrain, at first. The system builds TCF (terrain clearance floor) far the buffer zone upon the surface of ground relief to avid the ground collision. If the helicopter enters to the buffer zone during navigation, the real-time warning message which commands to raise the body pops up using Matlab menu. While departing or landing, control of the height of the body is possible. At present, the information (x, y, z coordinates) from the GPS is assumed to be input into the system every 92.8 m of horizontal distance while navigating along flight path. DTM of 3" interval has been adopted from that which was provided by ChumSungDae Co., Ltd..