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Sang June Park,Moonoh Kim,Jun-Yeop Lee,Hang-Rae Cho,Suil Bang 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
Safety for the radioactive waste disposed of in the disposal facility should be secured through safety assessment in consideration of the various situations. In this study, the influence and correlation of EDTA and ISA, which are the factors that can impede the safety of the disposal facility, were analyzed using the PHREEQC computational code. Thermodynamic database (TDB) of Andra, specific ion interaction theory (SIT) model as ionic strength correction model, radionuclides (Ni, Am, Pu) were adopted to perform the calculation on the distribution of chemical species by pH. According to the results, EDTA dominated the system and the effect of ISA is relatively small for the distribution of the chemical species of divalent and trivalent cations in neutral and weak base conditions. In the case of the tetravalent cations, the effect of ISA increased compared to the previous case especially in the strong base conditions. In conclusion, EDTA has a more significant effect on the system than ISA under the environment of the domestic disposal facility. Furthermore, when EDTA and ISA are present simultaneously in the system, the effects of two materials are inversely proportional and this characteristic should be considered during the safety assessment.
Estimation of Measurement Uncertainty in Vitamin D Analysis from Domestic Foods
Jun-Yeop Lee,Chang-Wan Lim,Kwang-Eun Jung,Byung-Man Kwak,Ki-Woong Lee,Young-Min Choi,Jin-Ju Park,Sang-Hoon Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Contents of vitamin D in domestic foods were analyzed by high performance liquid chromatography tandem mass spectrometer. The uncertainty of measurement was estimated based on GUM (guide to the expression of uncertainty in measurement) and the Draft EURACHEM/CITAC Guide. The sources of measurement uncertainty, such as sample weight, final sample volume, standard solution, calibration curve and the repeatability, were identified. And that was evaluated for type A and B uncertainty then used as parameters to determine the combined standard uncertainty. An expanded uncertainty was calculated by multiplying the combined standard uncertainty with a coverage factor (k) calculated from the degree of freedom. The content of vitamin D₃ from Squid was 2.34 μg/100 g and the expanded uncertainty by multiplying by the coverage factor (k=2) was 0.11 μg/100 g at approximately 95% confidence level. The most influential uncertainty sources were repeatability and calibration curve.
Spontaneous Rupture of the Extensor Pollicis Longus Tendon in a Tailor
Jun Cheol Choi,Woo Sung Kim,Hwa Yeop Na,Young Sang Lee,Woo Suk Song,Dae Hyeon Kim,Tae Hoon Park 대한정형외과학회 2011 Clinics in Orthopedic Surgery Vol.3 No.2
A spontaneous rupture of the extensor pollicis longus (EPL) tendon is associated with rheumatoid arthritis, fractures of the wrist, systemic or local steroids and repetitive, and excessive abnormal motion of the wrist joint. The authors encountered a case of a spontaneous rupture of the EPL tendon. The patient had no predisposing factors including trauma or steroid injection. Although the patient had a positive rheumatoid factor, he did not demonstrate other clinical or radiological findings of rheumatoid arthritis. During surgery, the EPL tendon was found to be ruptured at the extensor retinaculum (third compartment). Reconstruction of the extensor tendon using the palmaris longus tendon was performed. At the 18-month follow-up, the patient showed satisfactory extension of the thumb and 40° extension and flexion at the wrist.