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Invariants with New Indexing Functions: Application to Welding Panel Recognition
정문호,이왕헌 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.1
Many lines in a typical cluttered image incur a size explosion when invariants from every combination of the extracted lines are calculated. To solve this problem, we propose a new method of reducing the search space by introducing not only a line convex hull (LCH) but also an indexing logic filter (ILF). The LCH arranges five lines in a unique order and classifies a set of five lines into topological types. The ILF produces an integer indexing key from the acquired LCHs. The LCH and ILF are incorporated into a hierarchical database so that the model features can be retrieved efficiently. We achieved satisfactory results for synthetic welding panels used in shipbuilding.
정문호,문석환 한국의사결정학회 2008 의사결정학연구 Vol.16 No.1
A case study was performed for a plastic mold manufacturing company where optimal mold cooling conditions were analysed using Lean Six Sigma methodology. For the injection process, mold surface temperature turned out to be the major factor affecting injected part quality and productivity, as well as the cooling time of the injection process. The 5 vital few factors that determine the mold surface temperature were identified by ANOVA analysis. The experimental results were applied to the real production mold process and considerable reduction of cooling time was achieved.