• Journal of the Korean Society of Marine Environment & Safety
• /
• v.23 no.2
• /
• pp.200-207
• /
• 2017

The purpose in having a control surface on ships is to control the motion of the ship. The control surface may be composed entirely of a single movable surface or of a combination of fixed and movable portions. A control surface has one sole function to perform in meeting its purpose, and that is to develop a control force in consequence of its orientation and movement relative to the water. The forces and moments generated as a result of this rotation and angle of attack then determine the manoeuvring characteristics of the ship. In this paper, two-dimensional flow characteristics of a flapped rudder and a water-blowing control rudder were accomplished respectively by PIV method in a circulating water channel. Model test has been carried out with different angles of attack of main foil (NACA 0012) and flap's deflection angles to predict the performance of the flapped rudder and the water-blowing control rudder. The 2-frame particle tracking method has been used to obtain the velocity distribution in the flow field. $Re{\fallingdotseq}3.0{\times}10^4$ has been used during the whole experiments and measured results have been compared with each other.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.6
• /
• pp.165-178
• /
• 2011

A gigantic ship is constructed by assembling various types of ship blocks, each block being made by cutting and piecing the steel-plates together. The steel-plate piling process as the initial stage of ship construction sorts and manages the steel-plates according to the ship blocks that the steel-plates are used to make. The steel-plate piling process poses some problems such as process delay due to piling errors, safety vulnerability due to the handling of extra heavy-weight objects, and the uncertainty of work plan due to lack of information management in the pile spaces. We constructed a steel-plate piling process system based on the context-aware computing to resolve such problems. We built simulation system that can simulate the piling process and then established a smart space within the system by using tags, sensors and a real-time location system in order to collect context information. Workers receive an appropriate or intelligent service from the system.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.18 no.6
• /
• pp.1310-1316
• /
• 2014

The IMO has recommended on VHF digital communications operation for sailing ships from 2017. And ships more than 5 tons is obliged to digital communications by fishing Vessels Act and Vessel Safety Act in domestic. The owner of all vessel is equipped to the automatic position reporting device in accordance with the Notice of the Ministry of Oceans and Fisheries to regulations, It shall be ensure to navigations safety and in order to respond quickly in the event of maritime accidents on all vessels. The info-communications station of fishery is operating the automatic position reporting system using the VHF DSC in east sea from 2012, Continuously, which is underway the install plan in south sea and yellow sea. But this plan is very difficult, because of propagation environment is poor on account of complicated coastline and many islands. This paper has analyzed the propagation coverage for position setting of coast station in south sea and the traffic zone set up by compare with RSSI and methode of navigation tracking by VMS.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.2
• /
• pp.821-828
• /
• 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 the Korea Institute of Information and Communication Engineering
• /
• v.18 no.5
• /
• pp.1207-1214
• /
• 2014

Recently it has become easier to figure out cargo positional information by using GPS(Global Positioning System) and wireless communication technology. The acceleration of globalization in the shipping logistics is ever more increasing the need to provide visibility, traceability and real time informations of entry, departure of vessel including cargo and status of logistic vehicle entry into each logistic base. Providing such positional information to logistics party by using wireless communication technology can bring effective operation of supply chain and reduction in logistics costs. In the previous paper, I suggested a global location tracking system based on GPS data in global shipping logistics by means of software using GPS data. However, the previous system had a problem of being inadequate to figure out a real time location movement information and was unsatisfactory on quickly searching and checking the location of global logistics hubs according to the longitude and latitude coordinates. Hence, in this paper, I suggest a real-time location tracking system that provided real-time location of the container cargos and logistics hubs can be searched quickly according to the GPS coordinates in global shipping logistics.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2014.06a
• /
• pp.114-116
• /
• 2014

선교의 다양한 항해장비들 중 증강현실 시스템을 구성하는 요소를 식별하여 요소기술을 개발하였다. 이를 바탕으로 시작품을 제작하여 그 활용가능성을 검증하고자 실험을 수행하였다. 총 6명의 피실험자가 실험에 참여하였으며, 선박해양플랜트연구소의 Full mission bridge 시뮬레이터를 이용하였다. 아이트래킹을 이용하여 피실험자들의 시선추적결과와 함께 설문조사를 통한 개선사항을 도출하였다.

• Bulletin of the Society of Naval Architects of Korea
• /
• v.41 no.2
• /
• pp.100-106
• /
• 2004

2003년에, 충남 부여시에 건립 중인 백제역사민속박물관에 전시할 '백제사신선'에 대한 복원을 추진할 때, 백제의 해양 활동과 원양 해선에 관한 자료와 역사 고증 자료를 찾아 보았으나 설계나 조선 공작에 도움이 될 만한 자료를 국내에서는 구할 수가 없었다. 2001년 하절에 일본 신호상선대학을 방문하였을 때, 일본의 견당사선에 관한 자문을 상선학부의 송목철 명예교수와 정겸광행 교수에게 구하였던 바, [일본서기]와 회화 등에 일본의 원양해선인 견당사선에 관한 유익한 자료가 있다는 고견을 들었으며, 그 때 견당사선에 관한 참고 자료도 얻을 수 있었다. 그리고 일본의 원양 해선인 견당사선은 백제선식의 선박이라는 것을 여러 자료에서 발견하게 되었다. 이 논문에서는 일본의 견당사선의 실체를 추적하여 백제선의 선형과 선양을 도출하려 한다. (중략)

• Journal of Institute of Control, Robotics and Systems
• /
• v.8 no.1
• /
• pp.67-73
• /
• 2002

This paper presents the development of development of stabilization and tracking algorithms for a shipboard satellite antenna system. In order to stabilize the satellite antenna system designed in the previous work, a model for each control axis is derived and its parameters are estimated using a genetic algorithm, and the state feedback controller is designed based on the linearized model. Then a tracking algorithm is derived to overcome some drawbacks of the step tracking. The proposed algorithm searches for the best position using gradient-based formulae and signal intensities measured according to a search pattern. The effectiveness of both the stabilization and tracking algorithms is demonstrated through experiment using real-world data.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.631-634
• /
• 2003

이동체 기술은 자동차, 비행기, 선박 등과 같이 시간에 따라 공간상의 위치를 변경하는 시공간 객체에 대한 효율적인 데이터를 관리를 의미한다. 최근 정보통신 기술의 발전으로 이동차량의 위치를 측정하는 다양한 방법이 개발되었으며, 이를 기반으로 하는 개별적인 응용 시스템들이 개발되었다. 그러나 대부분의 기존의 관련 시스템은 특정한 단일의 측위 장치와 통신 방법만을 고려하여 구축되었기 때문에 이들간 데이터의 원활한 공유가 어려운 문제가 있다. 따라서 이 논문에서는 기존의 추적 기술을 토대로 생성된 다양한 형태의 위치 데이터를 통합하는 이동체 위치 데이터 인터페이스 모형을 제시한다.

• 제어로봇시스템학회:학술대회논문집
• /
• 2000.10a
• /
• pp.163-163
• /
• 2000

The tracking system on the moving vehicle is made up of two parts. One is a stabilizer which is flatting the system against the moving vehicle, the other is a tracker which is tracking the target. This makes use of the geometric information of the tracking target and that utilizes the dynamic information of the moving vehicle equipping the tracking system. Especially the stabilizer is very important for an ocean vehicle affected by wave, wind, and current. In this paper, the stabilizer of sun tracking system for a ship is developed.