• Title/Summary/Keyword: Leisure-Ship

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Experimental Study on Hydrodynamic Performance and Wave Power Takeoff for Heaving Wave Energy Converter (수직 진자형 파력 발전 장치의 운동성능 및 파력 추출에 관한 실험적 연구)

  • Kim, Sung-Jae;Koo, WeonCheol;Min, Eun-Hong;Jang, Hoyun;Youn, Donghyup;Lee, Byeongseong
    • Journal of Ocean Engineering and Technology
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    • v.30 no.5
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    • pp.361-366
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    • 2016
  • The aim of this study was to experimentally investigate the hydrodynamic performance of a hemispheric wave energy converter (WEC) and its wave power takeoff. The WEC is a heaving body-type point absorber with a hydraulic-pump power take-off (PTO) system. The hydraulic PTO system consists of a hydraulic cylinder, hydraulic motor, and generator, with consideration given to the hydraulic pressure and flow rate. Two body model shapes, including the original hemisphere and a bottom-chopped hemisphere, were considered. The heave RAOs of the two models were evaluated for various body drafts. The effects of the hydraulic PTO system on the RAOs were also investigated.

Spectrum Analysis and Detection of Ships Based on Aerial Hyperspectral Remote Sensing Experiments (항공 초분광 원격탐사 실험 기반 선박 스펙트럼 분석 및 탐지)

  • Jae-Jin Park;Kyung-Ae Park;Tae-Sung Kim;Moonjin Lee
    • Journal of the Korean earth science society
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    • v.45 no.3
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    • pp.214-223
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    • 2024
  • The recent increase in maritime traffic and coastal leisure activities has led to a rise in various marine accidents. These incidents not only result in damage to human life and property but also pose a significant risk of marine pollution involving oil and hazardous and noxious substances (HNS) spills. Therefore, effective ship monitoring is crucial for preparing and for responding to marine accidents. This study conducted an aerial experiment utilizing hyperspectral remote sensing to develop a maritime ship monitoring system. Hyperspectral aerial measurements were carried out around Gungpyeong Port in the western coastal region of the Korean Peninsula, and spectral libraries were constructed for various ship decks. The spectral correlation similarity (SCS) technique was employed for ship detection, analyzing the spatial similarity distribution between hyperspectral images and ship spectra. As a result, 15 ships were detected in the hyperspectral images. The color of each ship's deck was classified based on the highest spectral similarity. The detected ships were verified by matching them with high-resolution digital mapping camera (DMC) images. This foundational study on the application of aerial hyperspectral sensors for maritime ship detection demonstrates their potential role in future remote sensing-based ship monitoring systems.

Performance Prediction on the Seakeeping Characteristics of a Catamaran Power Yacht (카타마란형 파워요트의 내항성능 추정에 관한 연구)

  • Shon, Chang-Bae;Oh, Woo-Jun;Ku, Youn-Kyoung;Gim, Ok-Sok;Lee, Gyoung-Woo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2010.04a
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    • pp.385-386
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    • 2010
  • The ship's seakeeping performance in the pitching and roll motion was felt tired. These gives structural loads to loaded with cargo and hull facilities. Be to improve, small catamaran power yacht designed a data for ship research and ship's hull form to be decided. In this study, based on domestic release for coastal marine environment in the interpretation criteria were chosen based on the exercise performance. The seakeeping performance of marine leisure catamaran was based on voyage speed. The seakeeping performance estimates based on the encounter angle, the wave of the encounter frequency response amplitude ratio for exercise was assessed in the high performance area.

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A Study of Multi Hull Form Design for Small Leisure Fishing Vessels (소형 레저어선의 다동체 선형설계 연구)

  • Lee Seung-Hee;Lee Young-Gill;Kang Dae-Sun
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.9 no.2
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    • pp.98-108
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    • 2006
  • The vessels, already built and is operating in Korea, have the hull form of catamaran, with LOA(Length Over All) 15 m, LBP(Length Between Perpendiculars) 12 m, GT(Gross Tonnage) 9.77ton, Light Load Displacement 15.1ton. Korean Society of Ship Inspection & Technology, Chungnam National University, Inha University, Seoul National University and Advance Marine Tech co. ltd developed by cooperation it for fishing vessels. And it used FRP(Fiber Reinforced Plastics) for hull material and main engine of diesel $360ps{\times}2800rpm{\times}2sets$ with a water jet system. Based on these results, this paper describe small leisure fishing vessels with multi-hull, in relation to the project of CTYS(Regional Reserch Center for Transportation System of Yellow Sea Inha University) that aimed to development of trimaran hull form(LOA=17m, LBP=14m(Side Hull=6m), GT=9.77ton, Light Weight=11.2 ton).

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Study on the Necessity and Specific Recommendations for Enhancing the Legal Requirements for Underwater Recreational Vessel Propeller Guards (수중레저선박 스크류망 제도개선의 필요성과 구체적인 제안)

  • Jung-Soo Lee;Jeong-Tack Min;Ho-Yun Jang
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.30 no.2
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    • pp.226-232
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    • 2024
  • During scuba diving in Korea, accidents involving bodies being struck by the ship propeller when entering and exiting the water, repeatedly occur every year. In response to the need to reduce accidents and implement safety management measures, Korea has established regulations for the installation and management of propeller guards. However, owing to the absence of clear production regulations in domestic laws and regulations, the installation standards are ambiguous, and the inspection items are limited to the appearance and fixation status. As a result, the safety of divers in propeller accidents is not guaranteed. Therefore, this study was conducted to specify the current legal requirements for the installation and inspection of propeller guards. To achieve this goal, we conducted a thorough analysis of the current state of domestic and foreign propeller guards and the legal factors pertaining to safety standards. Based on this analysis, we identified specific areas for improvement and proposed a plan to enhance the system for installation and inspection. The installation standards for propeller guards were clearly outlined in terms of the lattice size and material. Additionally, inspection standards were proposed for appearance, fixation, and material condition, along with clear indicators for assessing them.

Structural Safety Assessments for Viewing Window of Semi-Submersible Catamaran (반 잠수형 쌍동선에 설치된 수중관람용 관람창 설계 및 구조 안전성 평가)

  • Hwang, Se Yun;Kim, Hosung;Lee, Kyeong Hoon;Kim, Yooil;Lee, Jang Hyun
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.4
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    • pp.291-299
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    • 2014
  • In the design process of ship or its comprising components, the key to the successful design is how to guarantee the structural safety satisfying the international standard and regulation, which sometimes is not clear enough to cover the detail designs. This study deals with the design procedure for submersible viewing window installed in catamaran. As the window material, the Plexiglass, a type of reinforced plastic, is considered to satisfy the design requirements of international standard. Window thickness is calculated using geometric nonlinear finite element analysis, in order to take into account possible large deformation due to low stiffness of the Plexiglass, and the results are compared with those determined by the procedure specified in ISO12216. Finally, for the validation of proposed design, the pressure test had been carried out following the procedure specified in the standard, and structural safety was checked.

Strength Characteristics of FRP Composite Materials for Ship Structure (선체구조용 FRP 복합재료의 강도 특성)

  • Choi, Han-Kyu;Nam, Ki-Woo;Ahn, Seok-Hwan
    • Journal of Ocean Engineering and Technology
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    • v.27 no.4
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    • pp.45-54
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    • 2013
  • In this study, various types of composite materials and adhesives that are actually used in the shipbuilding field for small ships, leisure boats, and fishing boats were applied in the hand lay-up method and vacuum infusion method to manufacture specimens. Then the tensile strength, tensile modulus, flexural strength, and flexural modulus values of these specimens were obtained. In addition, the barcol hardness and fiber content were obtained from the specimens. The results showed that the strengths of the specimens manufactured using the vacuum infusion method were higher than those manufactured using the hand lay-up method. Moreover, the barcol hardness and fiber content were also higher in those manufactured using the vacuum infusion method. The specimens manufactured using the vacuum infusion method were thinner despite their large fiber content.

A Study on Space Arrangement and Interior Space Division of Superyachts (수퍼요트의 공간배치와 실내공간구획에 관한 연구)

  • Lee, Han-Seok;Byun, Lyang-Soun
    • Korean Institute of Interior Design Journal
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    • v.16 no.6
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    • pp.224-231
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    • 2007
  • Superyachts are passenger vessels whose hull exceeds 24m. They are a kind of luxurious leisure ships. Interior designers can contribute in the field of space design of superyachts. This study is intended to investigate the space elements and their organization of superyachts for putting the base of superyachts interior design. Especially it is focused on the interior space division by structural elements such as the watertight bulkheads and decks. In this study we analyze general arrangements, floor plans of decks, of 31 superyachts and extract space elements and their disposition in three dimension. On the basis of the space arrangement we classify the types of space organization of superyachts. And then we inquire the interior space division of superyachts, which is characterized by the structural elements of the ship. The watertight compartments made by the bulkheads and decks have a great effect on interior space design in super yachts. The results of this study are summed up as follows: At first, the small-size superyacht has 3 decks and the midium or large-size superyachts has 4decks. Secondly, depending on the number of decks the superyachts has several typical patterns of space organization. Thirdly, in general there are 5-6 watertight compartments on a deck depending on the superyachts scale. Finally, there are distinct separation between the passenger's movement and the crew's movement on the ship.

A Study on the Space Structure and Feature of Interior in the Passenger's Residential Place of a Cruise Ship in Chronological Order (시기별 크루즈 선박 승객거주구역의 공간구성 및 실내디자인 특성에 관한 연구)

  • 진달래;이규백
    • Archives of design research
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    • v.16 no.4
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    • pp.215-224
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    • 2003
  • The cruiser trip which can have various experiences in a short time is growing as the best tourism package because there is less leisure time in contrast of the increased income in 21C. in other words, as the demand of the tourist goes up, the number of ships built newly is increasing. The order of the ship keeping first and second rank in Korea has arranged a long-term strategy in order to get into the global market with the cruiser with the high value added. They also set the objective related to the cruiser design and skillful construction work. We need to observe the change and trend of the cruiser with a care at this time when the cruiser industry is launched out. In this study, the cruiser industry is divided by four periods: the spring time, the depressed time, the developing time and the peak time, on the basis of the trend of the development and the change of space structure. In addition, it was analyzed in this study that there were the various trends such as the ratio, the structure and the type of the space as well as the interior plan in the passenger's residential place The aim of this study is to present the fundamental material about the interior plan to prepare for building the domestic cruisers in a foreseeable future.

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A Study on the Effective Safety Management Measures for the Prevention of Marine Accidents (해양사고 방지를 위한 효율적 안전관리 방안)

  • Chang, In-Shik
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.15 no.1
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    • pp.33-39
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    • 2009
  • The 21st century is often referred to as maritime age. The sea is a rich repository of natural resources, comfort shelters and the hopes and dreams of human being. But there is always possibility of disaster as well as hopes and dreams. Although there have been many advances in the ship building technology, the risk of accidents is on the increase due to the increase of maritime traffic and the revitalization of marine leisure. I like to refer to the systematic search and rescue system for the rapid response by analyzing recent marine accidents. For the safe navigation, it is necessary to establish institutional systems such as ship technology, navigation equipments, excellent human resources, traffic control, etc. and navigation components also have to be well organized each other. It is also necessary to build a prompt accident management system. The search and rescue system for the rapid response and the way of reducing the incidence of marine accidents were reviewed through the analysis of recent marine accidents.

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