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Dithiocarbamate 금속착물의 분배 및 추출평형 (제 1 보) 흔적량 무기수은(Ⅱ)의 용매추출
최호성,최종문,최희선,김영상,Ho-Seong Choi,Jong-Moon Choi,Hee-Seon Choi,Young-Sang Kim 대한화학회 1994 대한화학회지 Vol.38 No.12
The solvent extraction of an inorganic trace mercury in sea water samples was studied using zinc diethyldithiocabamate $Zn(DDC)_2$ as chelating agent. The $Zn(DDC)_2$ which maintained the stability of DDC- in the acidic aqueous solution in the course of extraction was synthesized from NaDDC and $ZnSO_4$ in this laboratory. The trace of mercury(Ⅱ) was extracted at pH 3.0 from 100 ml of sea water into 10ml of chloroform containing 0.05 M $Zn(DDC)_2$ by shaking for 5 minutes. And from the organic phase, the $Hg(DDC)_2$ was back-extracted into 10ml of 1 to 1 mixed acid of each 3% (v/v) nitric acid and hydrochloric acid by shaking for 25 minutes. The mercury back-extracted was determined by a cold vapor atomic absorption spectrophotometry. The trace mercury(Ⅱ) was so successfully extracted that this procedure could be applied to its determination in the sea water. That is, the recoveries of mercury in two kinds of samples into which as given amount of Hg(Ⅱ) was spiked were 90.0% and 93.3%, respectively. 킬레이트제로 zinc diethyldithiocabamate $[Zn(DDC)_2]$를 사용하여 해수중 흔적량 무기수은(Ⅱ)의 용매추출에 관하여 연구하였다. $Zn(DDC)_2$는 추출과정동안 산성 수용액에서 DDC-의 안정도를 유지하여 준다. 본 실험실에서 NaDDC와 $ZnSO_4$로부터 $Zn(DDC)_2$를 합성하였다. 흔적량 수은을 pH 3.0의 해수 100ml로부터 0.05 M $Zn(DDC)_2$의 클로포름 용액 10ml에 5분간 흔들어 추출하였다. 그리고 클로로포름 유기상으로부터 $Hg(DDC)_2$를 각 3% (v/v)인 질산과 염산의 1:1혼합산 용액 10ml에 25분간 흔들어 역추출하였다. 역추출된 수은을 냉증기 원자흡수 분광광도법으로 정량하였다. 본 추출과정을 해수중 수은의 정량에 응용하였고, 일정량의 수은을 첨가한 해수시료에서 90.0%와 93.3%의 회수율을 보여주었다.
장상우 ( Sang Wu Chang ),이상곤 ( Sang Gon Lee ),최호성 ( Ho Seong Choi ),송은영 ( Eun Young Song ),박용원 ( Yong Won Park ),이인애 ( In Ae Lee ) 대한임상검사과학회 2007 대한임상검사과학회지(KJCLS) Vol.39 No.1
The purpose of the clinically reportable range (CRR) in clinical chemistry is to estimate linearity in working range. The reportable range includes all results that may be reliably reported, and embraces two types of ranges: the analytical measurement range (AMR) is the range of analyte values that a method can directly measure on the specimen without any dilution, concentration, or other pretreatment not part of the usual assay process. CAP and JCAHO require linearity on analyzers every six months. The clinically reportable range is the range of analyte values that a method can measure, allowing for specimen dilution, concentration, or other pretreatment used to extend the direct analytical measurement range. The AMR cannot exceed the manufacturer’s limits. Establishing AMR is easily accomplished with Calibration Verification Assessment and experimental Linearity. For example: The manufacturer states that the limits of the AST on their instrument are 0-1100. The lowest level that could be verified is 2. The upper level is 1241. The verified AMR of the instrument is 2-1241. The lower limit of the range is 2, because that is the lowest level that could be verified by the laboratory. The laboratory could not use the manufacturer’s lower limit of 2 because they have not proven that the instrument values below 2 are valid. The upper limit of the range is 1241, because although the lab has shown that the instrument is linear to 1241, the manufacturer does not make that claim. The laboratory needs to demonstrate the accuracy and precision of the analyzer, as well the validation of the patient AMR. Linearity requirements have been eliminated from the CLIA regulations and from the CAP inspection criteria, however, many inspectors continue to feel that linearity studies are a part of good lab practice and should be encouraged. If a lab chooses to continue linearity studies, these studies must fully comply with the calibration/calibration verification requirements of CLIA and/or CAP. The results of lower limit and upper limit of clinically reportable range were total protein (2.1 - 79.9), albumin (1.3 - 39), total bilirubin (0.2 - 106.2), alkaline phosphatase (13 - 6928.2), aspartate aminotransferase (24 - 7446), alanine aminotransferase (13 - 6724.2), gamma glutamyl transpeptidase (16.64 - 9904.2), creatine kinase (15.26 - 4723.8), lactate dehydrogenase (127.66 - 13231.8), creatinine (0.4 - 129.6), blood urea nitrogen (8.67 - 925.8), uric acid (1.6 - 151.2), total cholesterol (48.52 - 3162), triglycerides (36.91 - 3367.8), glucose (31 - 4218), amylase (21 - 6694.2), calcium (3.1 - 118.2), inorganic phosphorus (1.11 - 108), HDL (11.74 - 666), NA (58.3 - 1800), K (1.0 - 69.6), CL (38 - 1230).
Al(1%Si)/Si 과 Sio2/Al(1%Si)/Si 다층박막의 열사이클 변형거동 분석
최호성,권동일,정정현,이소윤 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.3
Multilayer thin films are widely used in semiconductor devices and electronic packaging. In multilayer thin films, thermal stress, induced from mismatch in thermomechanical properties between constituents of each layer, causes micro mechanical failures such as interface delamination, cracking, yielding and creep. Thus, the evaluation of thermal stress evolution and its effects on the deformation behavior of multilayer system is very important. We presented an analytical model on thermal deformation of multilayer thin films on the basis of elastic/plastic beam bending theory concerning bending stress of the film layer. By using the model, we studied a common interconnection system in semiconductors. We deposited Al(1%Si) thin film and SiO₂ passivation layer of different thicknesses on Si wafers. In-situ laser scanning method was performed to measure the thermal stress induced curvature of the system. By applying the model to the measured curve of curvature vs. temperature, we could ascertain the validity of the model.
宋柱葉,白東勳,崔淏盛 全北大學校 1996 論文集 Vol.42 No.-
This study was carried out to investigate overall performance and to estimate effects of the environmental factors on body weights of the bull in Korean Native Cattle. Data used for this study included a total of 545 heads of Korean Native Cattle recorded from 1981 to 1990 at Alpine Experiment Station located in Kangwon province. The effects of year of birth, age of dam, parity of dam and season of birth were estimated by means of least squares method. Overall least squares means and standard errors for the body weights of the bull at birth, 4, 6, 12 and 18 months of ate were 26.8±0.13, 99.3±0.58, 142.4±0.80, 338.0±1.34 and 484.2±2.00㎏, respectively. The effects of year of birth showed significant differences on birth weigh and highly significant differences on the other traits. The effects of age of dam showed significant differences on 4 months of age. The effects of season of birth showed significant differences on all of the traits. the calves born in winter or spring were heavier than those born in summer or fall.