• 한국항해항만학회지
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• 제36권4호
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• pp.285-290
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• 2012

e-Navigation strategy IMO promotes is defined as it is necessary for network and information standard to provide various maritime safety informations to in land and on board users, and it is expected to provide a large amount and diverse kinds of maritime spatial information services to them. However, as there are some limits to transmit that by current mobile maritime communication technologies, it is required to simplify and optimize the information. In this study, tree node method is applied to ENC using Douglas-Peucker algorithm and we arranged the effect of simplified spatial information through CALS method which compensates the defect of basic tree node method.

• 한국항해항만학회지
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• 제27권6호
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• pp.631-638
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• 2003

Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards are reviewed from the viewpoint of safe navigation. Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curved, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMC criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2013년도 추계학술대회
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• pp.130-132
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• 2013

This paper presents an improvement for calculating method of astronomical vessel position with circle of equal altitude equation based on using a virtual object in sun and two stars observation. In addition, to enhance the accuracy of ship position achieved from solving linear matrix system, and surmount the disadvantages on rank deficient matrices situation, the authors used singular value decomposition (SVD) in least square method instead of normal equation and QR decomposition, so, the solution of matrix system will be available in all situation. As proposal algorithm, astronomical ship position will give more accuracy than previous methods.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2007년도 춘계학술발표회
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• pp.121-126
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• 2007

지난해 국제해사기구 (IMO)의 MSC 는 NAV 및 COMSAR 전문위원회에 E-Navigation 에 대한 전략 개발을 지시하였다. 효율적이고 안전한 선박 운항을 위한 E-navigation 서비스 구현을 위해서 해상 정보와 정보체계에 대한 이해가 선행되어야한다. 본 연구에서는 현재 범유럽적 차원에서 진행 중인 MarNIS 의 정보체계와 정보 에이전트에 대해서 살펴보았다. MarNIS 는 에이전트의 정보 창구로서의 Single Window와 각 시스템 말단에서 데이터 변환기로서의 MarNIS 노드에 의해 범유럽의 해상정보체계를 수립하고 있다. 정보 에이전트들이 계층적으로 구조화되고 통합된 해상 정보체계를 기반으로 각종 해상정보를 종합 분석하여 해상교통 지원 서비스와 해상안전 지원 서비스를 구현할 수 있다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1995년도 VTS and IBS 95 The Korean Institute of Navigation 1995년도
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• pp.184-192
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• 1995

Although ship's draught information onboard is substantial for both the safety of navigation and the estimation of loaded cargoes its accuracy depends in traditional surveying method on the skillfulness of observers and the condition of the sea surface round the vessel. To obtain more accurate information accessibly measuring instruments with sophisticated sensors such as mechanical electronic and ultrasonic transducers have been developed. however they have still limitation in accuracy and in making up a system due to the complexity of processing signal. In this paper we propose a he technique for analyzing ultrasonic pulse signal in order to improve the measurement accuracy and simplify a remote sensing system of draught by ultrasonic waves. This technique is useful for measuring draught being considered the influence of sea surface fluctuation and for transferring its data briefly to required equipment in integrated bridge system.

• 디지털콘텐츠학회 논문지
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• 제16권6호
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• pp.927-934
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• 2015

IMO의 이-내비게이션은 안전항해와 해양환경 보호를 위해 진행중인 프로젝트이다. 이-내비게이션의 전략 이행 계획 중 마리타임 클라우드라는 프로젝트가 존재한다. 마리타임 클라우드는 해양 이해관계자들 간의 정보교환을 위한 IT 프레임워크 기술이다. 마리타임 클라우드의 아키텍처와 클라이언트 프로그램인 EPD를 분석하여 구조, 동작방식 등을 파악하였으며 이를 통해 실제 클라이언트 프로그램을 구현하였다. 클라이언트 프로그램으로는 현재 AIS-ASM을 통해 제공되고 있는 서비스인 정박정보(Berthing Data)를 대상으로 마리타임 클라우드의 메시지 전달 기능인 MMS 서비스를 이용해 데이터 교환이 이루어질 수 있는지 테스트하였다. 테스트 결과 MMS 서비스를 이용한 데이터 교환에 성공하였으며 이는 향후 마리타임 클라우드 서비스 개발에 도움이 될 수 있으며, 한국형 마리타임 클라우드 개발에 기여할 수 있다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.519-524
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• 2006

This paper describes an application of information presentation based geographic map for maritime information, including navigation information. The work is motivated by the need to prepare maritime information representation and distribution for future generation Web network technology. This works consist of map generation using GML and application to maritime information. GML 3.0 became an adopted specification of the Open Geospatial Consortium(OGC) in January 2003, and is rapidly emerging as the world standard for the encoding, transport and storage of all forms of geographic information. This paper looks at the application of GML to one of the more challenging areas of maritime information. Specific features of GML of interest to maritime information provider are discussed and then illustrated through a series of maritime information case studies. The first phase of the work consists of the construction of GML application schema for using as a base map of maritime information. Maritime information is acquired from multiple sources, including standards documents, database schemas, lexicons, collections of symbol definition. The sources of GML ontological knowledge and the contribution of each source to the overall ontology are described in this paper. In the second phase, the prepared GML is used to create a prototype of the mixed maritime information as a base map - for tagging documents within the maritime domain. An overview of this prototype is included. One application area for these information elements described here is the integrated retrieval of maritime information from diverse sources, ranging from Web sites to nautical chart databases and text documents.

• Journal of Advanced Marine Engineering and Technology
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• 제34권3호
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• pp.376-382
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• 2010

These days, a study on 'Unmanned Surface Vehicle (USV)' has made very active progress in many countries. Even if it is being expected that there will be a great demand of USV for wide field, such as military operation, private sector, and etc., the study of USV in Korea is still at an early stage. For this reason, we have made a very small USV which is composed of dual mode (autonomous and remote control). The TCP/IP communication is applied to the USV.

• 한국항해항만학회지
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• 제33권2호
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• pp.105-110
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• 2009

Shipwaves am have harmful effects on ships working on the sea, in a harbour or navigational channel and caused beach erosion, seawall destruction. This study aims to investigate describe the characteristics of the wave pattern generated by an individual model ship tested at different velocities and hull forms for a given water depth and to investigate the variations at a given distance from the sailing line under the same conditions. As a result, the angles a's by model ship tests are smaller than those by real ship ones. Wave heights decreases with an increasing the mid-ship cross sectional area $A_s$. The maximum wave height and period increase rapidly in the subcritical speed, and beyond the critical speed the height and period decrease with increasing depth Froude number. And the period keeps constant with the distance from the sailing line.

• 한국항해항만학회지
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• 제29권4호
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• pp.313-318
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• 2005

Usually marine traffic survey has been conducted by some methods like an ocular observation using portable RADAR, a questionnaire, etc. But these should have expended a lot of manpower and expenses. In this paper, we have developed new observation module which could capture the RADAR image using PC camera simply, and allowed as to track targets on the PC monitor directly. And it has been programmed to make a database of RADAR image, target's track and information, and analyze the marine traffic tendency in various ways like vessel number crossed over gate line, vessel's velocity distribution in gate line, traffic density distribution, etc. We have confirmed that this module could observe and analyze the marine traffic efficiently and economically through several on-the-spot experiments.