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안인석(In-Suk Ahn),장홍용(Hong-Yong Jang) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1
Drilling steps have multi-step and one-step. At first optimized results of one-step drilling were obtained by high precision experiments in small diameter drilling of cutting work that is needed more small hole and high speed working. Especially, small hole deep drilling is one of the most important machining types and its necessity and importance become more and more increasing in the whole field of industry. And in second step, results of multi-step drilling were got of high precision experiments in small diameter drilling of cutting work. Then, this paper shows the evaluations of the limit depths with small diameter drills about one-step and multi-step drilling. The results are gained by tool dynamometer and Labview system and obtained during small diameter twist drilling system on SM45C steel for different machining conditions. The machine and tools are the CNC machining center and twist drill of diameter 1.5mm. And additionally, tool microscope show the relationship between shapes of chips and breakage shapes of small diameter drills.
7개 수종의 잎이 pH수준별 처리에 따른 엽록소 함량 및 침출액 pH변화
우종호,안인석,박용구 ( Jong Ho Woo,In Suk Ahn,Young Goo Park ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.2
We conducted this study as a fundamental study on the response of various tree species against acid rain. The tree species used for this study were Zelkova serrata, Robinia pseudoacacia, Quercus acutissima, Prunus serrulata, Ginkgo biloba, Pinus koraiensis and Pinus densiflora. The leaves were examined for the pH changes by treatment time and the chlorophyll content into various pH solution in vitro. The results obtained were as follows ; 1. When the leaves were immersed in the solution of various pH(pH 3.0-pH 6.0) levels, the pH were changed to species specific pH ranges as pH 5.0∼pH 5.5 of Z. serrata, pH 5.5∼pH 6.0 of R. pseudoacacia, pH 4.5∼pH 5.0 of Q. acutissima, pH 5.5∼pH 6.0 of P. serrulata, pH 3.5∼pH 4.5 of G. biloba, pH 3.5∼pH 4.5 of P. koraiensis until 48 hours. However, in case of P. densiflora, it was difficult to find specific pH range of the species. Z. serrata, R. pseudoacacia and P. serrulata showed a little pH increasing by pH 2.0 solution treatment, while other species showed no change by the solution. 2. The amount of chlorophyll contents in Z. serrata, R. pseudoacacia and P. serrulata were decreased after immersing in the pH 2.0 solution. Chlorophyll content was almost constant in other pH levels. Other species showed almost constant chlorophyll contents in various pH levels and treatment time.