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Abstract Design rules for ships have become more extensive and detailed due to an increase in the sizes of ships. Several variables and equations used in the rules are complex, thereby impeding their review by reviewers due to their voluminosity. In addition, because these rules are constantly revised, professional investigators may miss these changes. To prevent such confusion, a shipping register, which approves ship drawings, constantly automates the search and review processes of the rules. Consequently, this study proposes a method for recognizing variables in documents to review the rules and build relationships between variables. Each component of a document must be accurately identified. The document containing these rules includes different components such as equations, figures, and strings. Because these rules are mainly converted to a portable document format (PDF) for compatibility, it is challenging to extract each component as raw data. This study used a public library to extract elements from the PDF and utilized the positional relationship between the elements to identify the variables. By applying the Levenshtein distance algorithm, which compares the differences between two strings, the document was partitioned following to the table of contents. Hence, the identified variables were indexed into sections of the table of content. Additionally, based on the indexed information, a data structure was proposed to show the equations, definition of variables, and relationships. This study applied it to common structural rules (CSR), which are widely used in the shipbuilding industry. The effectiveness of the proposed method was confirmed by achieving the F1-score = 0.93 in variable recognition and intuitively visualizing the relationship between the variables.
Publication Date 2022-11-16
Role Corresponding Author
Category SCIE
Impact Factor 6.167

Min-Chul Kong, Myung-Il Roh, Ki-Su Kim, Ho-Gyun Park, Jong-Oh Kim, "Variable Indexing Method in Rule Documents for Ship Design Using Extraction of PDF Elements", Journal of Computational Design and Engineering, Vol. 9, No. 6, pp. 2556-2573, 2022.11.16

https://doi.org/10.1093/jcde/qwac123


List of Articles
번호 분류 제목 Publication Date
76 International Journal Myung-Il Roh, Kyu-Yeul Lee, "Optimal Scheduling of Block Lifting in Consideration of the Minimization of Traveling Distance While Unloaded and Wire and Shackle Replacement of a Gantry Crane", Journal of Marine Science and Technology, Vol. 15, No. 2, pp. 190-200, 2010.06.01 file 2010-06-01
75 International Journal Myung-Il Roh, Kyu-Yeul Lee, "Generation of the Production Material Information of a Building Block and Simulation of the Block Erection for Computer-Aided Process Planning and Scheduling in Shipbuilding", International Journal of Production Research, Vol. 45, No. 20, pp. 4653-4683, 2007.10.01 file 2007-10-01
74 International Journal Myung-Il Roh, Kyu-Yeul Lee, "Generation of the 3D CAD Model of the Hull Structure at the Initial Ship Design Stage and Its Application", Computers in Industry, Vol. 58, No. 6, pp. 539-557, 2007.08.01 file 2007-08-01
73 International Journal Myung-Il Roh, Kyu-Yeul Lee, "Development of a 3D CAD System for Modeling Hull Structure at the Initial Ship Design Stage", Ships and Offshore Structures, Vol. 1, No. 2, pp. 135-151, 2006.04.01 file 2006-04-01
72 International Journal Myung-Il Roh, Kyu-Yeul Lee, "An Initial Hull Structural Modeling System for Computer-Aided Process Planning in Shipbuilding", Advances In Engineering Software, Vol. 37, No. 7, pp. 457-476, 2006.07.01 file 2006-07-01
71 International Journal Myung-Il Roh, Ju-Hwan Cha, "A Block Transportation Scheduling System Considering a Minimization of Travel Distance without Loading of and Interference between Multiple Transporters", International Journal of Production Research, Vol. 49, No. 11, pp. 3231-3250, 2011.06.01 file 2011-06-01
70 International Journal Myung-Il Roh, "Determination of an Economical Shipping Route Considering the Effects of Sea State for Lower Fuel Consumption", International Journal of Naval Architecture and Ocean Engineering, Vol. 5, No. 2, pp. 246-262, 2013.06.01 file 2013-06-01
69 International Journal Myung-Il Roh, "Block Layout Method in the Block Stockyard Based on the Genetic Algorithm", Ocean Systems Engineering, Vol. 2, No. 4, pp. 271-287, 2012.12.01 file 2012-12-01
68 International Journal Min-Jae Oh, Taw-Wan Kim, Myung-Il Roh, "G1 Bezier Surface Interpolation with T-junctions at a 3-Valent Singular Vertex", Computer Aided Geometric Design, Vol. 67, pp. 79-95, 2018.12.01 file 2018-12-01
67 International Journal Min-Jae Oh, Myung-Il Roh, Tae-Wan Kim, "Local T-spline Surface Skinning with Shape Preservation", Computer-Aided Design, Vol. 104, pp. 15-26, 2018.11.01 file 2018-11-01
66 International Journal Min-Jae Oh, Myung-Il Roh, Sung-Woo Park, Do-Hyun Chun, Se-Hyun Myung, "Big Data-based Piping Material Analysis Framework in Offshore Structure for Contract Design", Ocean Systems Engineering, Vol. 9, No. 1, pp. 79-95, 2019.01.01 file 2019-01-01
65 International Journal Min-Jae Oh, Myung-Il Roh, Sung-Woo Park, Do-Hyun Chun, Myeong-Jo Son, Jeong-Youl Lee, “Operational Analysis of Container Ships by Using Maritime Big Data”, Journal of Marine Science and Engineering, Vol. 9, No. 4, pp. 438: 1-21, 2021.04.18 file 2021-04-18
64 International Journal Min-Chul Kong, Myung-Il Roh, Ki-Su Kim, Jeongyoul Lee, Jongoh Kim, Gapheon Lee, "Object Detection Method for Ship Safety Plans Using Deep Learning", Ocean Engineering, 2022.02.15 file 2022-02-15
» International Journal Min-Chul Kong, Myung-Il Roh, Ki-Su Kim, Ho-Gyun Park, Jong-Oh Kim, "Variable Indexing Method in Rule Documents for Ship Design Using Extraction of PDF Elements", Journal of Computational Design and Engineering, Vol. 9, No. 6, 2022.11.16 file 2022-11-16
62 International Journal Luman Zhao, Myung-Il Roh, “A Thrust Allocation Method for Efficient Dynamic Positioning of a Semisubmersible Drilling Rig Based on the Hybrid Optimization Algorithm”, Mathematical Problems in Engineering, Vol. 2015, pp. 1-12, 2015.10.01 file 2015-10-01
61 International Journal Luman Zhao, Myung-Il Roh, Sung-Jun Lee, "Control Method for Path Following and Collision Avoidance of Autonomous Ships Based on Deep Reinforcement Learning", Journal of Marine Science and Technology (Taiwan), Vol. 27, No. 4, pp. 293-310, 2019.08.01 file 2019-08-01
60 International Journal Luman Zhao, Myung-Il Roh, Seung-Ho Ham, "Performance Analysis of an Active Heave Compensation System on an Offshore Supply Vessel Using the Hardware-In-The-Loop Simulation", Journal of Marine Science and Technology (Taiwan), Vol. 26, No. 5 file 2018-10-01
59 International Journal Luman Zhao, Myung-Il Roh, Seung-Ho Ham, "Anti-Sway Control of the Crane on an Offshore Support Vessel Based on the Hardware-In-The-Loop Simulation", International Journal of Offshore and Polar Engineering, Vol. 28, No. 2, pp. 182-189, 2018.06.01 file 2018-06-01
58 International Journal Luman Zhao, Myung-Il Roh, Jeong-Woo Hong, "Optimal Thrust Allocation for Dynamic Positioning of Deep-sea Working Vessel", Journal of Advanced Research in Ocean Engineering, Vol. 1, No. 2, pp. 94-105, 2015.06.01 file 2015-06-01
57 International Journal Luman Zhao, Myung-Il Roh, "COLREGs-Compliant Multiship Collision Avoidance Based on Deep Reinforcement Learning", Ocean Engineering, Vol. 191, pp. 1-15, 2019.11.01 file 2019-11-01
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