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Ar / Ar-H2 플라즈마 및 전자선 용해에 의한 인바 및 퍼멀로이 Fe-Ni 합금의 정련
박병삼,백홍구 ( Byung Sam Park,Hong Koo Baik ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.2
N/A It is difficult to remove such interstitial impurities as sulfur, oxygen, hydrogen and carbon in Fe-Ni alloys. Thermodynamic and kinetic studies were carried out on the behavior of hydrogen gas, oxygen gas, Si, Al and slag, and the reaction time by the Ar/Ar-H₂ plasma and electron beam melting. After the addition of Al, Si, they were melted by Ar plasma with reaction time changed. 80%Ni-Fe alloys showed a better deoxidation than 36%Ni-Fe alloys. At Ar-H₂ plasma melting, the deoxidation was significant. In the case of the electron beam melting, the residual oxygen was higher than in Ar plasma melting because electron beam melting temperature was lower than that of Ar plasma. For the decaburization, it was melted by Ar-O₂plasma melting, which could remove effectively carbon by activated oxygen in plasma. We added slag to Fe-Ni alloys for the desulfurization. As the result of this experiments, the amount of residual sulfur was not changed according to the slag ratio and reaction time.
6.4cm 크기의 일방향 성장된Y$Ba_2$$Cu_3$$O_x$ 제조
박병삼,한상철,한영희,정년호,윤희중,김경진,성태현,오제명 한국초전도학회 2004 Progress in superconductivity Vol.5 No.2
We fabricated large single grain YBa$_2$Cu$_3$O$_{x}$ (Y-123) superconductors. The single grain Y-123 was grown by top seeded melt growth (TSMG) method. In a conventional box furnace with uniform temperature distribution, it was very difficult to grow large single grain Y-123 superconductors due to the size limitation in growth. To overcome the size limitation, we applied a radial thermal gradient (lower temperature at sample center and higher temperature on the sample edge) to the TSMG process. In this case, large single grain Y-123 could be easily grown. This is attributed that the liquid of the sample edge was maintained at the high temperature compared to the growth front. Using this method, we successfully fabricated a large single grain Y-123 of 6.4 cm X6.4 cm
Relative Skeletal Muscle Mass Is Associated with Development of Metabolic Syndrome
박병삼,윤지성 대한당뇨병학회 2013 Diabetes and Metabolism Journal Vol.37 No.6
Background: Visceral adiposity is related to insulin resistance. Skeletal muscle plays a central role in insulin-mediated glucose disposal; however, little is known about the association between muscle mass and metabolic syndrome (MS). This study is to clarify the clinical role of skeletal muscle mass in development of MS. Methods: A total of 1,042 subjects were enrolled. Subjects with prior MS and chronic diseases were excluded. After 24 months,development of MS was assessed using NCEP-ATP III criteria. Skeletal muscle mass (SMM; kg), body fat mass (BFM; kg), and visceral fat area (VFA; cm2) were obtained from bioelectrical analysis. Then, the following values were calculated as follows: percent of SMM (SMM%; %): SMM (kg)/weight (kg), skeletal muscle index (SMI; kg/m2): SMM (kg)/height (m2), skeletal muscle to body fat ratio (MFR): SMM (kg)/BFM (kg), and skeletal muscle to visceral fat ratio (SVR; kg/cm2): SMM (kg)/VFA (cm2). Results: Among 838 subjects, 88 (10.5%) were newly diagnosed with MS. Development of MS increased according to increasing quintiles of BMI, SMM, VFA, and SMI, but was negatively associated with SMM%, MFR, and SVR. VFA was positively associated with high waist circumference (WC), high blood pressure (BP), dysglycemia, and high triglyceride (TG). In contrast, MFR was negatively associated with high WC, high BP, dysglycemia, and high TG. SVR was negatively associated with all components of MS. Conclusion: Relative SMM ratio to body composition, rather than absolute mass, may play a critical role in development of MS and could be used as a strong predictor.
Predicting Mortality of Critically Ill Patients by Blood Glucose Levels
박병삼,윤지성,문준성,원규장,이형우 대한당뇨병학회 2013 Diabetes and Metabolism Journal Vol.37 No.5
Background: The aim of this study is to observe the outcome of critically ill patients in relation to blood glucose level at admission and to determine the optimal range of blood glucose at admission predicting lower hospital mortality among critically ill patients. Methods: We conducted a retrospective cohort study of a total 1,224 subjects (males, 798; females, 426) admitted to intensive care unit (ICU) from 1 January 2009 to 31 December 2010. Blood glucose levels at admission were categorized into four groups (group 1, <100 mg/dL; group 2, 100 to 199 mg/dL; group 3, 200 to 299 mg/dL; and group 4, ≥300 mg/dL). Results: Among 1,224 patients, 319 patients were already known diabetics, and 296 patients died in ICU. Five hundred fifty-seven subjects received insulin therapy, and 118 received oral hypoglycemic agents. The overall mortality rate was 24.2% (296 patients). The causes of death and mortality rates of diabetic patients were not different from nondiabetic subjects. The mortality curve showed J shape, and there were significant differences in mortality between the groups of blood glucose levels at admission. Group 2 had the lowest mortality rate (P<0.05). Conclusion: These results suggest that serum glucose levels upon admission into ICU is associated with clinical outcomes in ICU patients. Blood glucose level between 100 and 199 mg/dL at the time of ICU admission could predict lower hospital mortality among critically ill patients.
박병삼(BS Park),이상녕(SN Lee),강창구(CG Kang),기광수(KS Kee),임헌정(HJ lm) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.11
From May 1995 to February 1997, 46 patients underwent resectoscopic surgery for infertility. Of 46 patients, 32 patients had uterine synechiae, 5 patients had polyps, 3 patients had septums, 3 patients had bony foreign bodies, 2 patients had submucosal myomas, 1 patient had tuberculous endometritis. The resectoscopic procedure proved of special value for resection of intrauterine adhesion, submucosal myoma, septum and polyp. Except 5 patients, intrauterine conditions were improved and 10 patients were conceived. So it goes without saying that resectoscopic surgery is a effective and acceptable procedure for the management of infertility of endometrial factors. However, with the finding of slightly less satisfactory results with time and number, further follow-up is still needed to establish the usefulness of the procedure.