• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2013.06a
• /
• pp.304-306
• /
• 2013

선박의 대형화, 고속화로 인한 해난 사고 증가에 대응하기 위해 전자해도 도입이 되었다. 전자해도는 속성정보와 공간정보로 구성되는 안전을 위한 GIS 데이터다. 전자해도 객체는 200여 가지로 각 객체별 다양한 속성으로 구성된다. 국제수로기구는 전자해도 객체에 포함되는 속성값 입력을 표준적으로 수행하기 위해 전자해도 객체 입력 지침(Use of Object Catalogue)를 정의 하였다. 전자해도 제작을 위해서 전자해도 객체지침서 교육이 필요하며, 교육 시에는 UOC가 사용되었다. 한편, UOC의 교육 효율성을 높이기 위해서 많은 요구사항이 제안 되었다. 본 연구에서는 UOC의 교육 효율성을 높이기 위해 지원 도구를 설계 및 개발 하였다.

• Proceedings of the KIEE Conference
• /
• 2003.07c
• /
• pp.1484-1486
• /
• 2003

본 연구는 항공, 선박, 자동차, 철강, 철도, 건설 산업 등에서 필수적으로 사용되고있는 여러 비자성 금속의 전기전도도에 대하여 4단자 측정방법 및 비접촉 측정방법에 의한 정밀측정원리를 적용하여 전기전도도를 측정한 결과 4단자 측정방법의 경우 ${\pm}$0.1 %이하의 표준편차 범위 내에서 안정된 값을 보였고, 그 결과를 비접촉 측정방법(eddy current원리를 활용한 전기전도도 측정기)으로 측정한 결과와 상호 비교하였으며, 두 측정방식에 따른 전기전도도 측정결과는 최대 1.5 %이내에서 일치 하였다.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1207-1208
• /
• 2007

현재 GPS 데이터는 항공기 운항과 선박운항, 해양활동 및 육상 운송수단 등의 광범위한 분야에서 사용 중이다. 본 논문은 이 데이터를 시간과 장소에 제약 없이 시뮬레이터를 통하여 얻을 수 있도록 하였으며, 시뮬레이터를 통하여 발생한 GPS 데이터는 현재 상용화된 GPS 수신기의 신호와 동일하다. 또한 GPS 데이터는 GPS 국제 표준 데이터인 NMEA-0183의 위치정보 프로토콜을 사용하였으며, 데이터 분석을 위한 NMEA 프로토콜의 취득은 상용 GPS 모듈을 주행 중인 실제 차량에 탑재해 취득하였으며, 신호취득에는 RS232C통신 인터페이스를 사용하였다. 시뮬레이터의 프로그래밍은 GUI 기반의 윈도우즈 응용프로그램을 사용하여 누구나 간단한 조작만으로 차량의 위치와 속도 등의 변경이 가능하도록 구현하였다.

• Bulletin of the Society of Naval Architects of Korea
• /
• v.27 no.2
• /
• pp.31-39
• /
• 1990

Deck wetness phonomena has long been considered as one of the factors that degrade the performance of a ship in waves. In rough weather, the frequent shipping of water may give rise to the capsizing of the ship. Therefore an appropriate above water bow design is an improtant assert to a ship of which successful performance in rough weather is a prerequisite such as a warship. In this paper the experimental technique for estimation of deck wetness frequency is presented. The results of the model tests are compared with those of calculation using Ochi's formula. Finally the applicability of Ochi's formula is discussed.

• Journal of Ocean Engineering and Technology
• /
• v.28 no.1
• /
• pp.77-84
• /
• 2014

Recently, CFRP composites have often been used as the materials for lightweight pleasure yacht hulls. Because CFRP composites not only make the hull light but also have good physical characteristics, in the leading countries of the marine industries, CFRP yachts are being sold at a higher price. The design and construction of FRP composite yachts, including those made of CFRP, have to follow rules based on ISO 12215, such as the hull structure rules of the international classification societies. On the other hand, there are no rules related to CFRP composites in the Guidance for Recreational Crafts, which was newly revised by the Korean Register of Shipping. In this paper, ISO 12215-5 and Part B, RINA Pleasure Yacht (REGISTRO ITALIANO NAVALE) on the design pressure and scantling of CFRP hull structures are compared and analyzed. Through a comparative study and the application to a cruise yacht design, we try to understand how to design CFRP hull structures using the international standards, ISO 12215, and the rules of the international classification society, RINA.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39C no.12
• /
• pp.1280-1288
• /
• 2014

In this paper, we use the ECMA-392 standard, the first cognitive radio networks to meet the demand for IT services in the ship. First, we learn about ECMA-392-based network and examine the consideration and the problems for assigning channels to the device. And, we propose a fair channel resource allocation to ensure efficiently channel required by device groups in ECMA-392 MAC protocol. This is a method to reallocate the channels fairly with considering the channel assignment parameters to a new device group and existing device groups. The simulation results show that the proposed scheme improves throughputs compared to the existing one.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.9
• /
• pp.352-357
• /
• 2020

This study was performed to solve the quality problems of forging propeller shaft components in the marine diesel engines during the final cooling process and provide reasonable guidelines to increase the production of forging products. Residual hydrogen existing on the inside of forging products begins to diffuse and accumulates at the pores, micro-fissures, and grain boundaries as the temperature of forging products begins to decrease and reaches a critical temperature range, and finally transforming into internal defects. These defects were easily found near the surface of products after milling the surface of forging products. In this work, four types of forging products (shaft flange, shaft journal, thrust shaft, and propeller shaft) were chosen to evaluate the temperature history of products during the cooling process, employing non-linear numerical analyses with the ANSYS program. The times elapsed to reach 250 ℃ after cooling were approximately 9 ~ 23 hours for each forging product. These times can be used as cooling process guidelines on the quality and productivity of products after heat treatment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.364-366
• /
• 2017

Unlike general ships, offshore plants require high reliability due to their long operating time at fixed positions when they are operated. Sensor-based status information is required for user and maintenance worker to ensure safety. In this paper, we propose a monitoring system for safety diagnosis and inspection of cargo lift for offshore plant. It consists of a sensor unit mounted on the cargo Lift, an embedded system measurement unit, and a monitoring unit for real-time data verification. It is based on the ship standard network IEC 61162-450 for the exchange of operating information and sensor measurement information in accordance with the upgrading and integration of equipment in maritime.

• Journal of Navigation and Port Research
• /
• v.34 no.1
• /
• pp.1-8
• /
• 2010

Electronic Navigational Charts(ENCs) are a database for the use of supporting the safety of navigation in marie voyage embedded within the navigational information in the Electronic Chart Display & Information System(ECDIS). Recently IMO made a decision on the mandatory equipment resolution of ECDIS for the international SOLAS vessels until 2018. With this regulation intention together the spontaneous uses from the wide range of marine applications are accelerating the increasing demand for ENCs at both of the navigational purpose and the non-navigational purpose. But there seems to be not enough guidelines or systematic approach for the service of the non navigational purpose. This paper deals with ENCs distribution issues. We present a integrated solution for the ENCs service of both user domains and also demonstrate the implemented results.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.28 no.1
• /
• pp.39-46
• /
• 2010

Sounding data is the essential source for the safety of ships navigation system, and fundamental to the reasonable usage and maintenance of the ocean as well. As IT tech, positioning equipment such as GPS and INS, echo sounder are developed, recently, the precise submarine topography database bas been built by Multi-Beam Echo Sounder. However, MBES data includes some inevitable error caused by several factor, and some data have errors where the terrain is wobble. The error, which causes the $moir\acute{e}$ pattern error is the main factor hindering the accuracy of MBES data results, and therefore it is necessary to figure out the main cause of the error for the improvement of the accuracy by removing error data. On this research, the main cause of the error data is studied by analyzing motion sensor value of data including the $moir\acute{e}$ pattern error. Thus, as the result of examination, it turns out that the $moir\acute{e}$ pattern error is related to the standard deviation of Roll, and error data values are results of the non-correspondence between Swath data and Roll values caused by the drastic change of Roll values. Accordingly, the error data is removed by comparing between the gradient of Swath data and Roll values. Finally, as the result of removing error data, it is expected to be able to estimate the quality of MBES using the standard deviation of Motion sensor's Roll value, and calculate the additive error factor, which minimize non-corresponding data, and also this research must be contributed to improve the accuracy of sounding for small vessels with lots of motion in the bad circumstance for navigation.