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이명규(Myung Gyu LEE),김선택(Sun teak KIM),김현구(Hyun Goo KIM),안욱성(Wook Sung AHN),최기인(Ki In CHOI),최철호(Zel Ho CHOI),구상만(Sang Man Koo),서인숙(In Sook SEO) 한국생태공학회 2014 한국생태공학회지 Vol.4 No.1
This study was performed to investigate background levels of barium (Ba), chromium (Cr) in Korean geological units. Also, the BCR sequential extraction method was conducted to identify chemical distribution of those compounds in Korean geological units and the simple bioavailability extraction test (SBET) was conducted to evaluate bioaccessibility. The soil samples taken from 17 sites were analyzed to survey background levels. The average concentrations and ranges for metals are as follows; Ba: 74.20 (23.25 ~ 171.28), Cr: 26.48 (6.74 ~ 75.89) mg/kg. The BCR sequential extraction method was conducted to identify chemical distributional existence of 2 elements of soils from each geological unit. Cr in soils mainly exist as residual form. However, in case of Ba, ion exchangeble and reducible form were relatively high compared with other metals. SBET bioaccessibility of metals were in the order of Ba (47.6%), Cr (0.8%). The results of speciations, and bioaccessibilities of metals in this study can be used to provide a fundamental data to set soil pollution standards and to evaluate the soil contamination level.
Ball-bar Artifact 를 이용한 CMM의 공간 오차 측정 및 분석
구상서,이응석 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Volumetric error measurement and calibration of a coordinate measuring machine are studied by using a Ball-Bar artifact. Examples of the Ball-Bar design are shown using in bar materials and precision steel balls. Also, for the uncertainty error using the Ball-Bar is discussed. Method of Ball-Bar artifact and the analysis of the error vectors are proposed. Using the Ball-Bar data, we studied the method of volumetric errors analysis of a coordinate measuring machine.