• Title/Summary/Keyword: Smart Ship

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Development of Incline Test Application for Smart Phone (스마트폰용 경사시험 앱 개발)

  • Lee, Kyoung-Hoon;Jin, Jae-Hoon
    • Journal of Korea Ship Safrty Technology Authority
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    • s.33
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    • pp.32-52
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    • 2012
  • 선박의 경사시험에 사용되는 수동식 계측기기는 측정 자체가 사람의 관능에 의존하기 때문에 현장계측자 개인의 경험에 따라 측정 데이타의 신뢰도에 편차가 발생할 개연성이 높다. 그러나 경험치에 의존하지 않고 경사시험의 신뢰성을 담보할 측정방법의 개선이나 개발은 현재까지 없었다. 경사시험 시 정밀한 계측센서를 이용하여 경사각을 계측한다면, 선박의 복원성판정에 정확성을 기할 수 있을 것이다. 따라서 본 연구에서는 전자식 자이로 센서가 내장된 스마트폰(태블릿 PC)을 이용하여 선박의 경사각을 계측하고, 아울러 그에 따른 선박의 경하 상태의 배수량 및 중량중심을 자동으로 계산할 수 있는 앱을 개발하여 선박 복원성판정의 유효성을 검증하였다.

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자율운항시스템의 자율도 기준 설계를 위한 기초 연구

  • 김정민;이상훈;예병덕
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.11a
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    • pp.166-167
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    • 2022
  • 자율운항선박의 개발 및 운용에 대한 논의가 최근 조선해운업계에서 활발하게 이루어 지구 있다. IMO 해사안전위원회 98차회의에서는 자율운항선박을 '다양한 자동화 수준에서 인간의 간섭 없이 독립적으로 운용될 수 있는 선박'으로 정의하였으며, 자율운항 규정 검토작업을 수행하기 위한 임시 정의에 덧붙여서 이러한 자율화등급을 4개로 구분하였다. 하지만 현재 자율화 등급과 관련하여 단순히 인적 요소의 유무로만 구분하기에는 범위가 너무 넓어 재정립이 필요하다는 요구가 있다. 자율운항선박에서의 자율화 등급은 선박의 설계, 구조, 운항등과 밀접하게 관련되는 매우 중요한 요소이기에 본 논문에서는 선박의 등급 화를 나누는 기준 중 동적위치제어시스템을 탑재한 선박들의 등급 기준을 검토하여, 인적 요소 외 다른 요소의 기준이 적용될 수 있는지의 여부에 대해 알아보고자 한다.

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A Study of Test and Evaluation Methods for Manpower of System of System (함정 전투성능 신뢰성 보장을 위한 승조원 수 적절성 시험평가 제한점 및 시험평가 제도 개선방안)

  • Byeongjun An;Jeongho Song
    • Journal of the Korean Society of Systems Engineering
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    • v.20 no.1
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    • pp.16-25
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    • 2024
  • By deriving the limitations of the test evaluation, it was intended to suggest a plan to improve the test evaluation system for the appropriateness of the number of ship crews according to the design and construction of troops-saving ships. Currently, the number of crew members by ship type is confirmed and specified in the ROC(Operation Requirement Performance) in the early stages of design, such as conceptual design, but there is a limit to testing and evaluating the appropriateness of ensuring reliability of combat performance.

Implementation of a Vessel USN for Safety Monitoring System Based on ZigBee (선박 및 해양구조물의 안전 모니터링 정보 획득을 위한 ZigBee Sensor node 적용에 관한 연구)

  • Kim, Dae-Seok;Lee, Kyung-Ho;Lee, Jung-Min
    • Korean Journal of Computational Design and Engineering
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    • v.19 no.2
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    • pp.169-181
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    • 2014
  • Recently ships and ocean platforms are becoming increasingly technological, unmanned, and huge. Maintenance and safety monitoring of these products is very important for safety reasons. Therefore, real-time monitoring of safety regions, such as the engine room, and hull structure, and environmental states, like fire and pressure of LNG tanks, is required for the sustainable ships. In this paper, a ZigBee-based wireless sensor network is suggested to monitor ships and ocean platforms effectively. However, this causes some telecommunication problems because these products are made of steel. To resolve this problem, we use the mesh networking of Zig-Bee that can monitor the regions and environmental states consistently. The telecommunication of such a monitoring system is tested on a real container ship and its performance is verified. The real-time monitoring results are displayed on the users' smart devices.

Investigation of Seakeeping Performance of Trawler by the Influence of the Principal Particulars of Ships in the Bering Sea

  • Thi Thanh Diep Nguyen;Hoang Thien Vu;Aeri Cho;Hyeon Kyu Yoon
    • Journal of Ocean Engineering and Technology
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    • v.38 no.2
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    • pp.43-52
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    • 2024
  • Investigating ship motion under real conditions is vital for evaluating the seakeeping performance, particularly in the design process stage. This study examined the influence of the principal particulars of a trawler on its seakeeping performance. The wave conditions in the Bering Sea are investigated using available data. The length-to-beam (L/B) and beam-to-draft (B/T) ratios of the ship are changed by 10% for the numerical simulation. The response amplitude operator (RAO) motion, root mean square (RMS) value and sensitivity analysis are calculated to evaluate the influence of the trawler dimensions on ship motions. The peak RAO motion affected the ship motions noticeably because of the resonance at the natural frequency. The L/B and B/T ratios are important geometric parameters of a ship that significantly influence its RMS motion, particularly in the case of roll and pitch. The change in the B/T ratio has a good seakeeping performance based on a comparison of the roll and pitch with the seakeeping criteria. The present results provide insights into the seakeeping performance of ships due to the influence of the principal dimensions in the design stage.

The Design of the Drawing Management on Smart Operating Environments (스마트 운영 환경에서의 도면 관리기의 설계)

  • Kim, Dong-Hyun;Park, Min-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.05a
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    • pp.223-226
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    • 2011
  • To design a drawing at construction sites or ship yards, generally, they exploit CAD program, such as AutoCAD. They also carry the printed drawings in the fields in order to refer the designs. However, the printed designs are easy to be damaged. In this paper, we propose the design of a management system for the CAD drawings on top of the smart operating systems of a smart device. The proposed system exploits the index file based on the Fixed GRID file in order to improve the display speed of the drawings.

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Analysis and Design of Common Platform Core Technology for Maritime Autonomous Surface Ships (자율운항선박의 공통플랫폼 요소기술 분석 및 설계)

  • Jeong, Seong-hoon;Shim, Joon-Hwan;Choi, Kwan-seon;Son, Young-chang
    • Journal of Advanced Navigation Technology
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    • v.22 no.6
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    • pp.507-513
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    • 2018
  • The maritime autonomous surface ship is automatically collects and manages various information necessary for the operation to minimize human intervention and safely perform the mission assigned to the ship. And the ship may autonomously operate the partial or entire route to the destination determined by the ship himself. This ship navigation technology allows partially remote control the ship to be operated if necessary. The maritime autonomous surface ship (MASS) should collect and manage signals of various navigation communication equipments and engines mounted on the ship for safe operation. This requires a common platform technology. In this paper, we propose a common platform that is the core of smart ship implementation. Territorial authorities and ships are connected by satellite or terrestrial communication. In such a communication environment, information is exchanged smoothly in real time. This allows the onshore authorities to monitor ships and provide remote control to enable safe vessel navigation at sea.

A Study on the Method and Application of Shaft Repair using Directed Energy Deposition Process (직접식 에너지 용착 공정을 활용한 축 보수 방법 및 활용 사례 연구)

  • Lee, Yoon Sun;Lee, Min Kyu;Sung, Ji Hyun;Hong, Myeong Pyo;Son, Yong;An, Seouk;Jeong, Oe Cheol;Lee, Ho Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.9
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    • pp.1-10
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    • 2021
  • Recently, the repair and recycling of damaged mechanical parts via metal additive manufacturing processes have been industrial points of interest. This is because the repair and recycling of damaged mechanical parts can reduce energy and resource consumption. The directed energy deposition(DED) process has various advantages such as the possibility of selective deposition, large building space, and a small heat-affected zone. Hence, it is a suitable process for repairing damaged mechanical parts. The shaft is a core component of various mechanical systems. Although there is a high demand for the repair of the shaft, it is difficult to repair with traditional welding processes because of the thermal deformation problem. The objective of this study is to propose a repair procedure for a damaged shaft using the DED process and discuss its applications. Three types of cases, including a small shaft with a damaged surface, a medium-size shaft with a worn bearing joint, and a large shaft with serious damage, were repaired using the proposed procedure. The microstructure and hardness were examined to discuss the characteristics of the repaired component. The efficiency of the repair of the damaged shaft is also discussed.

Investigation of two-phase natural circulation with the SMART-ITL facility for an integral type reactor

  • Jeon, Byong Guk;Yun, Eunkoo;Bae, Hwang;Yang, Jin-Hwa;Ryu, Sung-Uk;Bang, Yun-Gon;Yi, Sung-Jae;Park, Hyun-Sik
    • Nuclear Engineering and Technology
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    • v.54 no.3
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    • pp.826-833
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    • 2022
  • A two-phase natural circulation test using SMART integral test loop (SMART-ITL) was conducted to explore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically, the test examined the natural circulation in the primary loop under a stepwise coolant inventory loss while keeping the core power constant at 5% of the scaled full power. Based on the test results, three flow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation (TPNC), and boiler-condenser natural circulation (BCNC). The flow rate remained steady in the SPNC, slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulation flow map, the natural circulation characteristic in the SMART-ITL was compared with those in pressurized water reactor simulators. In the SMART-ITL, a BCNC regime appeared instead of siphon condensation and reflux condensation regimes because of the use of once-through steam generators.