• Research in Plant Disease
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• v.14 no.3
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• pp.214-218
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• 2008

Coleosporium neocacaliae, a needle rust fungus, was described and illustrated for the first time on the needles of Pinus koraiensis (Korean pine) in Korea. Detailed descriptions of the species were verified based on symptoms and signs, and light and scanning electron microscopic observations on aecia, aeciospores and peridial cells. The present needle rust fungus was apparently different from C. eupatorii, a solely recorded Coleosporium species on P. Koraiensis in Korea until this time, in having comparatively large sized aeciospores as $20-39{\times}14-27\;{\mu}m$ than those of latter species (size of aeciospores $15-27{\times}10-20\;{\mu}m$). Verrucose surface structure of aeciospores in light microscopy was revealed to be annulated with three to four rings and root-like base in scanning electron microscopy. Aecial stage of C. neocacaliae were formed on the middle days of April to the early days of June and collected around the central parts of Korean peninsula, including high mountains of about 1,000 m above sea level.

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.42-46
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• 2004

0.5mm thick steel is used to manufacture nail files. The first process is blanking the blank and then make about 300 holes of 0.8$\~$1.0mm in diameter. This process depends mainly on etching which takes $33\%$ of manufacturing cost and it can make manufacturing cost rise. The residual etching reagent is not environmentally friendly and the steel material is apt to rust as well. The key accomplishments of this research are to change the material from steel to stainless and develop a progressive perforating die in place of etching process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.4
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• pp.309-314
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• 2004

0.5mm thick steel is used to manufacture nail files. The first process is blanking and the second process is making about 300 holes of 0.8-l.0mm in diameter. This process depends mainly on etching which takes 33% of manufacturing cost and it can make manufacturing cost rise. The residual etching reagent is not environmentally friendly and the steel material is apt to rust as well. To solve these problems, researches on the following subjects are performed: proper material to prevent from rusting and strip layout strategies in stamping to replace etching process with press process which makes use of die. And new quill type punch is developed to replace the regular standard punch, one of the die parts, which frequently get broken while working. And these researches and developments lead to develop a progressive perforating die.