• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.253-253
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• 2017

본 연구에서는 연륙연도 사업에 대응하는 경제성 및 안정성을 갖춘 쌍동선형 차도선의 개발을 위해 U형과 V형의 서로 다른 쌍동선형을 CFD 해석을 수행하여 저항성능을 비교하였다. CFD 해석 결과 U형 쌍동선형의 경우 14kts 이상의 고속에서 선수부 파형에 이상이 발생하여 정상적인 운행이 불가능하다 판단되었으며, 이에 비해 V형은 동일한 속도에서도 이상이 발생하지 않았으며, 또한 U형 쌍동선형 대비 V형 쌍동선형의 경우, 저속에서는 U형 대비 높은 침수표면적에도 불구하고 거의 같은 $R_{TS}$값을 보이지만, 고속으로 넘어가면 U형에 비해 확연히 낮은 $R_{TS}$값을 보임을 확인, V형의 쌍동선형이 U형에 비해 저항성능이 개선됨을 확인하였다.

• Journal of the Society of Naval Architects of Korea
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• v.51 no.1
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• pp.42-50
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• 2014

Lifting lugs are frequently used in shipyard to transportate and turn over blocks. As the shipbuilding technology develops, blocks has become bigger and bigger, and block management technology takes a more important role in shipbuilding to enhance the productivity. For the sake of economic as well as safe design of lug structure, more rigorous analysis is needed. In this study in order to investigate the strength characteristics of two type of lug, that is, D and T type lugs, non-linear strength analysis has been carried out to compare the ultimate strength characteristics of two types of lug varying in-plane and out-of-plane loading directions. Based on the present numerical analysis results, it can be drawn that T type lug is superior to D type lug from view points of ultimate strength and deformation.

• Korean Journal of Computational Design and Engineering
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• v.8 no.2
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• pp.122-132
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• 2003

STEP AP218 has a standard schema to represent the structural model of a midship section. While it helps to exchange ship structural models among heterogeneous automation systems, most shipyards and classification societies still exchange information using 2D paper drawings. We propose a feature parameter input method to generate a 3D STEP model of a ship structure from 2D drawings. We have analyzed the ship structure information contained in 2D drawings and have defined a data model to express the contents of the drawing. We also developed a QUI for the feature parameter input. To translate 2D information extracted from the drawing into a STEP AP2l8 model, we have developed a shape generation library, and generated the 3D ship model through this library. The generated 3D STEP model of a ship structure can be used to exchange information between design departments in a shipyard as well as between classification societies and shipyards.

• Journal of the Society of Naval Architects of Korea
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• v.47 no.6
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• pp.836-842
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• 2010

Safety system including location monitoring system for blasting workers was studied. Positioning performance of the location monitoring system was highly dependent on communication protocol and the number of access points in the blasting cell. RTLS(Real Time Location System) is an important technology to develop the location information of workers and variously used to enhance workers safety. Location monitoring system with Cell-ID and RSSI wireless communication technology was verified to have a proper positioning performance for the steel block application.

• IE interfaces
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• v.22 no.2
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• pp.116-125
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• 2009

We revisit the assembly block storage location assignment problem (ABSLAP) at a shipyard, in order to compensate for the deficiency in performance verification of the heuristic ABSLAP algorithm developed by the previous study. In this paper, we formulate a mathematical programming model of the ABSLAP, refine elaborately the heuristic ABSLAP algorithm, and show the performance of the developed mathematical programming model and the revised heuristic ABSLAP algorithm. In addition, we explain simulation experiments conducted using the revised heuristic ABSLAP algorithm to investigate the influences of block stockyard layouts and production schedule instability on the block stockyard operations.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.6
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• pp.673-680
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• 2019

This study investigates the validity of applying new carbon nanotube (CNT, Carbon Nano Tube) surface heaters, which are applied in combination with various products, to the vessel's materials, and proposes the commercializable products accordingly. In order to actually apply a CNT surface heating system technology to the ship's equipment for the first time in Korea, we carried out the interview of experts in the technology field and the due diligence of the shipyard, and presented the technology road map for the selected three items. Finally, for "Heating System of Ship Fuel Tank" with the highest commercialization potential, we proposed a conceptual diagram to enable the final development of the product through the product analysis.

• Bulletin of the Society of Naval Architects of Korea
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• v.13 no.3
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• pp.25-43
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• 1976

조선소(造船所)를 기획(企劃)함에 있어 우선 수행(遂行)해야 할 일은 선박시장분석(船舶市場分析)이다. 이에 따라서 건조대상선박(建造對象船舶)을 선정(選定)하게되고 적정작업량(適定作業量)을 결정(決定)하게 되며 Layout 작업(作業)에 들어갈 수 있다. 조선소(造船所) Layout 작업(作業)에서는 건조기술(建造技術)과 밀접(密接)한 관계(關係)를 지어 건조과정(建造過程)의 Network에서 Outlined Layout를 구(求)한다. 각(各) Work stage별(別) Detailed layout는 채택(採擇) 하려는 건조기술(建造技術)과 그 Stage의 물동량(物動量)에 따라서 결정(決定)지어진다. Layout의 마지막 단계(段階)는 이 Layout된 조선소(造船所)에서 건조(建造)하고자 하는 선박(船舶)의 추정건조선가(推定建造船價)와 현재(現在) 선박시장(船舶市場)에서의 선가(船價)와의 비교(比較)에 의한 Layout의 경제성(經濟性) 평가(評價)가 되겠다. 조선소(造船所) Layout는 단순히 Layout 작업(作業) 만으로는 수행(遂行)할수없고 건조(建造)하고자 하는 선박(船舶)의 개발작업(開發作業)과 병행(竝行)되어야 한다.

• International Journal of Naval Architecture and Ocean Engineering
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• v.4 no.1
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• pp.33-43
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• 2012

In this paper, a prototype of ship basic planning system is implemented for the small and medium sized shipyards based on the internet technology and concurrent engineering concept. The system is designed from the user requirements. Consequently, standardized development environment and tools are selected. These tools are used for the system development to define and evaluate core application technologies. The system will contribute to increasing competitiveness of small and medium sized shipyards in the 21st century industrial en-vironment.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.4
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• pp.415-425
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• 2019

This study proposes a new approach to control Moving Stuff Action Through Iterative Learning robot with dual arm for smart factory. When robot moves object with dual arm, not only position of each hand but also contact force at surface of an object should be considered. However, it is not easy to determine every parameters for planning trajectory of the an object and grasping object concerning about variety compliant environment. On the other hand, human knows how to move an object gracefully by using eyes and feel of hands which means that robot could learn position and force from human demonstration so that robot can use learned task at variety case. This paper suggest a way how to learn dynamic equation which concern about both of position and path.

• International Journal of Naval Architecture and Ocean Engineering
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• v.12 no.1
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• pp.60-70
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• 2020

The outfitting design of ships and offshore structures is mainly undertaken in a restricted space. Pipes occupying a large portion of outfitting design are normally manufactured outside the shipyard. This complicated manufacturing process results in frequent delivery delays. Inevitable design modifications and material changes have also resulted in inefficient pipe installation works. In this study, an algorithm is proposed to systematically determine the pipe installation sequence. An accurate and fast algorithm to identify the geometric relationship of piping materials is presented. To improve the calculation efficiency, the interference is gradually examined from simplified to complicated shapes. It is demonstrated that the calculation efficiency is significantly improved with successive geometric operations such as back-face culling and use of bounding boxes. After the final installation sequence is determined, the entire installation process is visualized in a virtual reality environment so that the process can be rendered and understood for a full-scale model.