• Title/Summary/Keyword: Steel-plate information system

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A Development of an Integrated Inventory Managing System for Steel-Plates (강재 통합 관리 시스템 개발)

  • Lee, Seok Hyun;Yu, Ji Hun;Kim, Hyun Chul;Jang, Seok Min;Lim, Rae Soo;Kim, Ho Kyeong;Heo, Joo Ho
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.2
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    • pp.130-137
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    • 2014
  • As one of the largest shipbuilding company in the world, STX Offshore & Shipbuilding currently developed an inventory managing system for steel-plates, which is applied to their steel stock yard. In a traditional way to manage steel yard, almost every work has been done by manually. The manual steel-plate piling process caused some problems such as process delay due to piling errors and the uncertainty of work plan due to lack of information. To solve these problems, we developed an integrated inventory managing system based on real-time crane tracking system which automatically updates steel-plates' piling status. We built the integrated steel-plate database, developed several programs including steel-plate input program, real-time steel-plate monitoring program and steel-yard management program, and constructed hardware system for tracking magnetic cranes. As a result, a supervisor of steel-yard can manage the inventory of steel-plates efficiently and furthermore plan an efficient piling schedule and crane working schedule.

A study for Development of Moving Multi-Head Printing System (다헤드 이송형 프린팅 시스템 개발에 관한 연구)

  • Noh, Hyo-Won;Kim, Ho-Kyoung;Kim, Rea-Soo;Song, Si-Myoung;Sin, Hun-Joo
    • Proceedings of the SAREK Conference
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    • 2008.11a
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    • pp.419-423
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    • 2008
  • This study is regarding to the Print System recording the information for the treatment on vessel steel plate in the process Ship Drying on moving without stopping. The print head accepts the locating information of moving steel plate sensored in sensor and It is aimed for the construction of facilities that the print head prints the information of maps, letters and signals for treatment on Steel plate surface on moving.

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Development of Robotic System based on RFID Scanning for Efficient Inventory Management of Thick Plates (효율적인 후판 재고관리를 위한 RFID 스캐닝 로봇 시스템 개발)

  • Lee, Kwang-Hyoung;Min, So-Yeon;Lee, Jong-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.10
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    • pp.1-8
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    • 2016
  • Automation of inventory management in a steel plate factory was a difficult problem unresolved for a long time. And now, it is also necessary to work diligently in the steel industry on efficient inventory management of thick plates. So far, the environmental characteristics of stacked thick plates means it is not easy to apply advanced technology for their automatic identification. In this paper, we propose a thick-plate robotic scanning system based on radio-frequency identification (RFID) that can provide quick and accurate inventory management by acquiring plate information after the scanning automatically recognizes the RFID tags under difficult load conditions. This system is equipped with a crane to move the plates in a pulled-up operation. It is equipped with a plate-only linear dipole antenna only for scanning the position of the plate tag. Only the linear dipole antenna, while moving the x-axis and y-axis information, automatically identifies the tag information attached to the plate. The tag information acquired by the system is used for stockpiling and is managed by steel plate inventory control software. The effectiveness of the proposed system is verified through field performance evaluation. As a result, the recognition rate of the plate tags is 99.9% at a maximum distance of 320 cm. The developed thick-plate antenna showed excellent performance compared to an existing commercial antenna.

Character Split Algorithm for an Automated Marking System with a Moving Ink-head (이동식 자동 마킹 시스템을 위한 문자열 분할 알고리즘)

  • Park, Doo-Kyung;Han, Sang-Dong;Kim, Ho-Gu;Ahn, Jung-Ki;Kim, Dae-Kyung
    • Special Issue of the Society of Naval Architects of Korea
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    • 2009.09a
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    • pp.115-122
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    • 2009
  • In shipbuilding process, automated marking systems are used to print steel part information on the steel plate. Especially, an automated marking system with a moving ink-head prints characters on each block, which divide the steel plate into a fixed size. Therefore it is necessary to split characters, because some characters can be extended into several blocks. Particularly the algorithm, which splits characters, must guarantee its printing quality in any direction since characters can be printed by any angle.

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Context-Aware Steel-Plate Piling Process System For Improving the Ship-Building Process (선박 건조공정 개선을 위한 상황인지 컴퓨팅 기반의 강재적치처리시스템)

  • Kang, Dong-Hoon;Ha, Chang-Wan;Kim, Je-Wook;Oh, Hoon
    • Journal of the Korea Society of Computer and Information
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    • v.16 no.6
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    • pp.165-178
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    • 2011
  • A gigantic ship is constructed by assembling various types of ship blocks, each block being made by cutting and piecing the steel-plates together. The steel-plate piling process as the initial stage of ship construction sorts and manages the steel-plates according to the ship blocks that the steel-plates are used to make. The steel-plate piling process poses some problems such as process delay due to piling errors, safety vulnerability due to the handling of extra heavy-weight objects, and the uncertainty of work plan due to lack of information management in the pile spaces. We constructed a steel-plate piling process system based on the context-aware computing to resolve such problems. We built simulation system that can simulate the piling process and then established a smart space within the system by using tags, sensors and a real-time location system in order to collect context information. Workers receive an appropriate or intelligent service from the system.

Development of Numerical Control System for Plate forming Automation (강판의 곡가공 자동화를 위한 수치제어 시스템의 개발)

  • 이주성
    • Journal of Ocean Engineering and Technology
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    • v.17 no.1
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    • pp.72-79
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    • 2003
  • This paper deals with the development of an interface program for automatic plate forming, which can exchange information between the heating line information generation program and the automatic heating apparatus. In this paper, the performance of the developed interface program has been verified from the view point of numerical position control. By applying the interface program to the operation of the automatic heating apparatus, an experiment of line heating has been conducted for several steel plate models. Based on the experimental results, a simplified relation to estimate angular distortion has keen derived as a natural characteristic of the present automatic heating apparatus. As a result of the present study, the prototype of the automatic plate forming system has been constructed, and its application to the real surface models found in the ship will be presented in the near future.

Numerical Control System for the Automation of Steel Plate Forming (강판의 곡가공 자동화를 위한 수치제어 시스템)

  • Lee, Joo-Sung;Shin, Sung-Min
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2002.10a
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    • pp.318-322
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    • 2002
  • In this paper the automatic plate forming system developed by the present research group is introduced, which would be helpful for other researchers. The present system consists of three parts : heating line information generation software, automatic heating apparatus and numerical control system. The numerical control system developed by the present authors is detailed. Performance test for the developed system has been carried out and good results has been obtained. As an extension of the present study, the present automatic plate fanning system will be applied to surfaces found in ship and offshore structure.

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Steel Plate Faults Diagnosis with S-MTS (S-MTS를 이용한 강판의 표면 결함 진단)

  • Kim, Joon-Young;Cha, Jae-Min;Shin, Junguk;Yeom, Choongsub
    • Journal of Intelligence and Information Systems
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    • v.23 no.1
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    • pp.47-67
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    • 2017
  • Steel plate faults is one of important factors to affect the quality and price of the steel plates. So far many steelmakers generally have used visual inspection method that could be based on an inspector's intuition or experience. Specifically, the inspector checks the steel plate faults by looking the surface of the steel plates. However, the accuracy of this method is critically low that it can cause errors above 30% in judgment. Therefore, accurate steel plate faults diagnosis system has been continuously required in the industry. In order to meet the needs, this study proposed a new steel plate faults diagnosis system using Simultaneous MTS (S-MTS), which is an advanced Mahalanobis Taguchi System (MTS) algorithm, to classify various surface defects of the steel plates. MTS has generally been used to solve binary classification problems in various fields, but MTS was not used for multiclass classification due to its low accuracy. The reason is that only one mahalanobis space is established in the MTS. In contrast, S-MTS is suitable for multi-class classification. That is, S-MTS establishes individual mahalanobis space for each class. 'Simultaneous' implies comparing mahalanobis distances at the same time. The proposed steel plate faults diagnosis system was developed in four main stages. In the first stage, after various reference groups and related variables are defined, data of the steel plate faults is collected and used to establish the individual mahalanobis space per the reference groups and construct the full measurement scale. In the second stage, the mahalanobis distances of test groups is calculated based on the established mahalanobis spaces of the reference groups. Then, appropriateness of the spaces is verified by examining the separability of the mahalanobis diatances. In the third stage, orthogonal arrays and Signal-to-Noise (SN) ratio of dynamic type are applied for variable optimization. Also, Overall SN ratio gain is derived from the SN ratio and SN ratio gain. If the derived overall SN ratio gain is negative, it means that the variable should be removed. However, the variable with the positive gain may be considered as worth keeping. Finally, in the fourth stage, the measurement scale that is composed of selected useful variables is reconstructed. Next, an experimental test should be implemented to verify the ability of multi-class classification and thus the accuracy of the classification is acquired. If the accuracy is acceptable, this diagnosis system can be used for future applications. Also, this study compared the accuracy of the proposed steel plate faults diagnosis system with that of other popular classification algorithms including Decision Tree, Multi Perception Neural Network (MLPNN), Logistic Regression (LR), Support Vector Machine (SVM), Tree Bagger Random Forest, Grid Search (GS), Genetic Algorithm (GA) and Particle Swarm Optimization (PSO). The steel plates faults dataset used in the study is taken from the University of California at Irvine (UCI) machine learning repository. As a result, the proposed steel plate faults diagnosis system based on S-MTS shows 90.79% of classification accuracy. The accuracy of the proposed diagnosis system is 6-27% higher than MLPNN, LR, GS, GA and PSO. Based on the fact that the accuracy of commercial systems is only about 75-80%, it means that the proposed system has enough classification performance to be applied in the industry. In addition, the proposed system can reduce the number of measurement sensors that are installed in the fields because of variable optimization process. These results show that the proposed system not only can have a good ability on the steel plate faults diagnosis but also reduce operation and maintenance cost. For our future work, it will be applied in the fields to validate actual effectiveness of the proposed system and plan to improve the accuracy based on the results.

Compressive Behavior of Steel Plate-Concrete Structures using Eco-Oriented Cement Concrete (친환경시멘트 콘크리트를 사용한 강판콘크리트구조의 압축거동)

  • Kang, Cheol-Kyu;Choi, Byong-Jeong;Jeoung, Beak-Seon
    • Journal of Korean Society of Steel Construction
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    • v.24 no.5
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    • pp.583-593
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    • 2012
  • The domestic research of the steel plate concrete structures have been focused on the nuclear structures requiring much strong resistance. There are many advantages in the steel plate-concrete structures such as the possibility of prefabricated production and modular construction. This research tried to establish some basic design information of SC structures toward mid to low-rise general buildings with low strength. To reduce the strength mentioned, the some of the cement in weight was replaced by the soils which are traditional and environmental oriented material where the new system can be used to general buildings. This paper studied on the compressive characteristics, effective length factors, buckling loading, steel plate buckling, and stud strength using the compression member subjected to the concentrated compression loadings.

Development of a Program for Prediction and Visualization of Welding Deformations (용접변형 예측 및 가시화 프로그램 개발)

  • 서승일;노재규;이정수
    • Journal of Welding and Joining
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    • v.20 no.5
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    • pp.113-119
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    • 2002
  • To prevent problems caused by welding deformation, preparation in the design stage is necessary. Countermeasures in the design stage is also the most cost-effective method. In this study, to give designers information on the welding deformation, a system to visualize the welding deformation is developed. The model to visualize the deformation is the stiffened plate common in steel structures. To increase computational efficiency, theoretical solutions to calculate the deformation of plate and stiffener are used instead of numerical analysis. Also, to secure accuracy, experiments to estimate bending moment causing welding deformations are performed. A computer program written with Visual C++ is developed for interactive data input, calculation of welding deformation and display of deformed shape. Designers can change the design in the early stage after checking the deformed shape by this system.