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화학적 산화 방법을 이용한 농축폐액 내 $^{14}C$와 $^{3}H$ 정략
안홍주,이홍래,한선호,Ahn Hong-Joo,Lee Heung-Nae,Han Sun-Ho 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.3
[ $^{14}C$ ] and $^{3}H$ in the evaporator bottom (EB) discharged from the Nuclear power plant (NPP) were extracted simultaneously into a gaseous $^{14}CO_{2}$ and liquefied HTO by using the chemical oxidation, which is the method to oxidize samples completely using potassium persulfate and sulfuric acid. The extracted $^{14}C$ and $^{3}H$ were counted by the liquid scintillation counter (LSC) after the quench correction. To examine the recovery of $^{14}C$ using the radioactive standards, $Na_{2}^{14}CO_{3}$, $^{14}C-alcohol$, and $^{14}C-toluene$ as $^{14}C$, and HTO as $^{3}H$ were used. Also, the most suitable method for oxidizing $^{14}C-toluene$, which is difficult to be oxidized, was investigated through FT-IR spectra according to the concentration of sulfuric acid. With the identical method, $^{14}C$ and $^{3}H$ in the EB generated in the NPP were assayed in the range of $8.35{\sim}l.38{\times}10^3$ Bq/g and $2.46{\times}10^2{\sim}1.40{\times}10^4$ Bq/g, respectively.
Obesity Increases Blood Pressure Variability during the Night
안홍주,김완,강정,남동인,정일형,강훈,이상선,송호영,조상철,강원유,황선호 대한고혈압학회 2014 Clinical Hypertension Vol.20 No.1
Background: Previous studies have reported that obesity increases heart rate variability. Body mass index (BMI) has beenreported to affect blood pressure variability (BPV) over 24 hours. However, the diurnal variation in the effect of BMI onBPV has not been evaluated. This study aimed to clarify the diurnal variation in the effect of BMI on BPV. Methods: A totalof 2,044 patients were consecutively enrolled in this study, and the data were analyzed retrospectively. All patientsunderwent 24-hour ambulatory blood pressure monitoring. We divided patients into two groups according to BMI(non-obese group: n = 1,145, BMI < 25; obese group: n = 899, BMI ≥ 25). We compared BPV during daytime and nighttimebetween the non-obese and obese groups. We also evaluated the impact of BMI on BPV by multivariate regression analysis. Results: On univariate regression analysis, there was no significant difference in BPV during daytime (systolic BP [SBP]variability: 20.7 vs. 21.7, p = 0.511; diastolic BP [DBP] variability: 16.8 vs. 17.5, p = 0.539). However, both SBP variability(13.8 vs. 17.6, p = 0.009) and DBP variability (11.7 vs. 14.3, p = 0.042) during nighttime were affected significantly byBMI. After adjusting other compounding variables (age > 60 years, current smoking habit, hypertension, diabetes mellitus,and use of calcium channel blockers and renin-angiotensin-aldosterone system blockers), multivariate analysis showed thatBMI was an independent factor associated with increase in BPV during the night (SBP variability: p = 0.039; DBPvariability: p = 0.034). Conclusions: Obesity increased BPV during nighttime.