• 제목/요약/키워드: shipbuilding industry

검색결과 533건 처리시간 0.039초

The Influence of Precipitated Phase in Al-4%Cu Alloy under High Magnetic Field

  • Jun, Jiang;Lee, Hyun-Jun;Min, Qi;Park, Won-Jo
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.239-243
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    • 2008
  • Nonferrous metals have a very important position in industry. At present, parts of shipbuilding, automobile, and aircraft etc. are designed and manufactured accurately, simultaneity need light-weight and high-strength. Aluminum copper alloys are one kind of typical precipitation hardening alloy which has been widely used. It is interesting to investigate transformation behavior of precipitated phase in such kind of alloys under high magnetic field. Transformation of materials under high magnetic field is many different compared with conventional condition. The author prepared the Al-4%Cu alloy.

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조선소 USN 서비스를 위한 LTE 기반 에이전트 개발 (Development of LTE based Agent for Shipyard USN Service)

  • 김태용
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2013년도 추계학술대회
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    • pp.69-70
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    • 2013
  • 조선 산업과 IT 기술의 융합을 통하여 선박 건조 시 생산시설과 생산 공정의 효율성을 극대화 시킬 수 있다. 현장에서 요구되는 각종 센싱 데이터 수집장치 기능과 모아진 데이터들을 중앙 서버로 전송하는 LTE 기반 통신장치를 개발하였으며, 통합 모니터링, 상황관리, 항해시험 및 사고방지 등에 적용 가능하다.

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기계적 인장법을 이용한 박판 평 블록의 용접변형 제어 (Control of Welding Distortion for Thin Panel Block Structure using Mechanical Tensioning Method)

  • 김상일
    • 대한조선학회논문집
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    • 제43권1호
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    • pp.68-74
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    • 2006
  • The welding distortion of a hull structure in the shipbuilding industry is inevitable at each assembly stage. This geometric inaccuracy caused by the welding distortion tends to preclude the introduction of automation and mechanization and needs the additional man-hours for the adjusting work at the following assembly stage. To overcome this problem, a distortion control method should be applied. For this purpose, it is necessary to develop an accurate prediction method which can explicitly account for the influence of various factors on the welding distortion. The validity of the prediction method must be also clarified through experiments. For the purpose of reducing the weld-induced bending deflection, this paper proposes the mechanical tensioning method (MTM) as the optimum distortion control method. The validity of this method has been substantiated by a number of numerical simulations and actual measurements.

AHTS 선박의 특성을 고려한 LNG 연료공급시스템 최적위치 연구 (Optimum Position Study of LNG Fueled System Considering Characteristics of AHTS Vessel)

  • 구자원;이원출;유병석
    • 대한조선학회 특별논문집
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    • 대한조선학회 2015년도 특별논문집
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    • pp.9-13
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    • 2015
  • While environmental concern is urging shipbuilding industry to reduce pollutant emission, it is necessary to design environmental friendly vessels. LNG as fuel for ship propulsion is proven to be effective way to reduce pollutant emission. In this study, we find optimum position of LNG fuel supply system on AHTS by considering vessel characteristic. Three different positions of fuel supply system are studied in this paper. Factors such as stability, strength and safety are examined in each position of fuel supply system.

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Supplier Evaluation in Green Supply Chain: An Adaptive Weight D-S Theory Model Based on Fuzzy-Rough-Sets-AHP Method

  • Li, Lianhui;Xu, Guanying;Wang, Hongguang
    • Journal of Information Processing Systems
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    • 제15권3호
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    • pp.655-669
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    • 2019
  • Supplier evaluation is of great significance in green supply chain management. Influenced by factors such as economic globalization, sustainable development, a holistic index framework is difficult to establish in green supply chain. Furthermore, the initial index values of candidate suppliers are often characterized by uncertainty and incompleteness and the index weight is variable. To solve these problems, an index framework is established after comprehensive consideration of the major factors. Then an adaptive weight D-S theory model is put forward, and a fuzzy-rough-sets-AHP method is proposed to solve the adaptive weight in the index framework. The case study and the comparison with TOPSIS show that the adaptive weight D-S theory model in this paper is feasible and effective.

Tidal current simulation around the Straits of Korea and its application to a speed trial

  • Lee, Hee-Su;Lee, Byung-Hyuk;Kim, Kyung sung;Kim, Sung Yong;Park, Jong-Chun
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제11권1호
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    • pp.474-481
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    • 2019
  • The speed trial of a ship is one of the important elements guaranteeing its performance under the contract between the ship owner and shipbuilding company. A speed trial at sea, where the tidal current and waves are suppressed to the maximum, can prevent measurement errors due to external force conditions. On the other hand, it is difficult to maintain a calm sea state in most sea areas determined by the influence of the tidal current, wave, wind, etc. Therefore, this study evaluated a method of simulating a tidal current, which is one of the external force conditions, at the speed test operation of a ship, and applied the simulation result to the plan of a speed trial.

개조된 케이슨 플로팅 도크의 구조 보강에 대한 연구 (A Study on the Structural Reinforcement of the Modified Caisson Floating Dock)

  • 김홍조;서광철;박주신
    • 해양환경안전학회지
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    • 제27권1호
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    • pp.172-178
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    • 2021
  • 선박 수리시장은 선박에 의한 환경오염 방지 강화, 선박구조에 대한 안전기준 강화 등의 영향으로 유지 및 보수에 관한 관심이 꾸준히 증대되고 있다. 이러한 영향을 반영하여 서남해에 있는 수리 조선사들에 외국 선사들의 수리 요청 접수 건수가 증가하고 있다. 그러나, 서남해권 수리 조선사들은 영세한 중소업체가 대부분이라서 수리조선 업체의 통합적 시너지 효과로 이어지기가 쉽지 않고, 집적화가 되어있지 않아서 인프라 공동활용이 어려워서 수리조선업 활성화에 걸림돌로 작용하고 있다. 수리조선업을 운영하기 위해서는 플로팅 도크가 필수적으로 필요로 하며, 대부분 노후화된 케이슨 도크를 해외로부터 수입한 후, 개/보수를 통하여 운용하고 있다. 그러나, 사용 수명이 30년 이상이고, 구조물 검사 기준이 없어서 안전분야에 취약성을 갖고 있다. 본 연구에서는 개조된 케이슨 도크의 구조 안전성을 평가하고, 도출된 문제점을 해결하기 위하여 추가적인 구조 보강안을 찾기 위하여 유한요소해석 프로그램인 ANSYS를 활용하였다. 플로팅 도크의 경우, 선급 규정이 있지만 구조강도 관련해서는 규정이 미흡하여 적용성이 떨어지고 있는 실정이다. 이러한 부족한 평가 영역에 대해서는 상세 구조해석을 통하여 보완하였다. 보강안은 수리조선소 작업의 특성을 고려하여 폰툰 갑판 상부 보강과 선측 탱크 보강으로 결정하였다. 결정안에 대한 구조해석을 통하여 선측 보강안을 최종안을 선정하였고, 실제 구조물을 제작하여 보강안을 반영하였다. 도출된 주요 결과들은 유사 설비의 구조 강도 개선을 위한 참고 자료로 활용 가능하며, 개/보수 시 이러한 방법을 활용하면 빨리 최적 해를 찾을 수 있을 것으로 기대된다.

우리나라 해운산업의 경쟁력 실태분석 (A Study on the Situation Analysis for Competitive Advantage Power of Korean Shipping Industry)

  • 이학헌;민성규
    • 한국항해학회지
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    • 제19권3호
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    • pp.35-65
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    • 1995
  • The development of Korean shipping industry is maybe defined into three development stages-industry fixing stage, industry coordinating stage, industry development stage-. The development of shipping industry has been depended on the geovernment/authority role such as shipping policy, system, law, rules and regulations. In 1983, Korean shipping industry reorganization and coordination by shipping authority have made our shipping industry on the stable condition together with each company's efforts. Today's world economic environment such WTO/UR negotiation results get this government role limited. According to the being reduced government role, each company's competitive advantage power becomes more important. Besides, korean shipping industry is exposed into the entire and bitter world competition. In order to win and prevent the world shipping competition, it is necessary to look out the competitive advantage power of Korean shipping industry. The first purpose of this study is the situation analysis for competitive advantage power of Korean shipping industry. The second is to compare with our shipping policies with foreign ones concerned with ship, cargo, crew, tax and others. But in order to compare with foreign shipping, this study need their shipping statistics data, this study has some limit of the foreign data. This study has been carried on the basis of the following items. 1. Shipping environment, 2. Ships and ship acquirement(shipbuilding/purchasing), 3. Oceangoing cargo and ship's stowage rate, 4. Human factor in shipping-crew, 5. The incomes and costs in finacial statements. We have some conclusions as following through the this study. First, Korean shipping industry environment-competitive disadvantage situation- has changed rapidly due to the shipping market opening, free market entering of foreign shipping. Second, Korean shipping is disadvantageous due to the high tax rate and financing conditions in connection with ship acquirement. In order to improve the competitive advantage power, the shipping tax system and ship financing conditions should be reviewed to profitable for owners. Third, but both world and Korean oceangoing cargoes quantity have been increased annualy, Korean ship's cargo stowage rate is being decreased. This is serious situation but Korean shipping take well use of foreign vessel with hire. It is recommended to take use of owner's vessel and hired ones in the long range view, considering the world shipping management. But the number of crew has been decreased by 2, 000~3, 000 annualy, it is desirable that the long sea-experienced crew have been increased. Almost of owners usauly complain the crew cost is the main obstacles to competitive advantage power. Human factor is the most important firm's asset. All owners should pay attention to this though, and invest the proper budget to training, education, welfare as much as possible. In the long run this effects could be feedback to owners. Fifth, We must improve the financial statements structure, that is, the first step is to increase income, the second is to decrease cost, the third is to increase income on the same cost, the fourth is to decrease cost on the same income. It is essential to find out what the urgent investment is and what unnecessary cost is. At last, in order to competite world shipping race, each shipping firm must try for himself to retain the power. The government/authority is no longer dependable. I believe that each firm's power will be the industry's power, the industry's power will be the nations's power.

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한국 수리조선산업의 국제경쟁력 분석 (Analysis on the International Competitiveness of Ship Repair Industry in Korea)

  • 송하철;서무천;염재선
    • 한국항해항만학회지
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    • 제34권10호
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    • pp.799-805
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    • 2010
  • 2000년대 이후 한국의 조선산업은 설계 및 생산기술력의 국제경쟁력을 바탕으로 세계를 선도하는 조선 1위국의 위상을 다져왔다. 최근 중국의 급격한 경제성장으로 인해 아시아 주요 3국(한국, 일본, 중국)의 해상물동량은 전 세계 해상물동량의 30%에 달하며 한국 해운산업 역시 새로이 건설된 대형 항만의 활성화에 힘입어 세계 10위권에 해당되는 등, 선박 수리 분야에 대한 막대한 국내 수요에도 불구하고 한국의 수리조선산업에 대한 경쟁력 분석을 수행한 연구는 드문 실정이다. 본 연구에서는 수리조선소 경쟁력의 주요지표인 입지여건, 수리비용 및 기술경쟁력을 중심으로 세계 주요 수리조선국과의 국제경쟁력을 비교 분석한다.