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화학적 에칭에서 교반속도 및 에칭 시간에 따른 유리 표면에서의 요철 형성과 Haze 및 투과도
손정일,김남혁,김광수 순천향대학교 부설 산업기술연구소 2016 순천향 산업기술연구소논문집 Vol.22 No.1
We investigated the effect of stirring speed and etching time on the hillock formation, haze and transmittance on the chemically etched glass. The chemical etching process were carried out by two steps. The Buffered hydrofluoric(BHF) acid was used for etching solution on the first step etching process. The BHF solution was made by mixture of HF, NH4F and distilled water. The combined solution with BHF and hydrochloric acid(HCl) was selected as the second step etching solution. The first etching process was performed on the several etching times and two different stirring speeds such as 100 and, 300rpm. The hillock formation was observed on the substrate glass after 1st step chemical etching process. The hillock was appeared to be protuberant on the surface. The density of the hillock was increased and the size of hillock was decreased as increasing stirring speed. The density of the hillock was also increased as increasing etching time. The micro-sized hillock on the surface was responsible for the haze and transmittance. The haze value was increased as increasing etching time and also as reducing stirring speed. While, the transmittance of the etched glass displayed pretty much constant values, like about 92%. However, the haze value could be reduced as experiencing the 2nd step etching process. It was also observed that the hillock was analyzed as ammonium based crystals by XRD and these crystals were dissolved after 2nd etching process.
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Hemoglobin A1c May Be an Inadequate Diagnostic Tool for Diabetes Mellitus in Anemic Subjects
손정일,이상열,우정택,황진경,진상욱,전숙,오승준,김성운,김영설 대한당뇨병학회 2013 Diabetes and Metabolism Journal Vol.37 No.5
Background: Recently, a hemoglobin A1c (HbA1c) level of 6.5% has been determined to be a criterion for diabetes mellitus (DM), and it is a widely used marker for the diagnosis of DM. However, HbA1c may be influenced by a number of factors. Anemia is one of the most prevalent diseases with an influence on HbA1c; however, its effect on HbA1c varies based on the variable pathophysiology of anemia. The aim of this study was to determine the effect of anemia on HbA1c levels. Methods: Anemic subjects (n=112) and age- and sex-matched controls (n=217) who were drug naive and suspected of having DM were enrolled. The subjects underwent an oral glucose tolerance test and HbA1c simultaneously. We compared mean HbA1c and its sensitivity and specificity for diagnosing DM between each subgroup. Results: Clinical characteristics were found to be similar between each subgroup. Also, when glucose levels were within the normal range, the difference in mean HbA1c was not significant (P=0.580). However, when plasma glucose levels were above the diagnostic cutoff for prediabetes and DM, the mean HbA1c of the anemic subgroup was modestly higher than in the nonanemic group. The specificity of HbA1c for diagnosis of DM was significantly lower in the anemic subgroup (P<0.05). Conclusion: These results suggest that the diagnostic significance of HbA1c might be limited in anemic patients.
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