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강형곤,안용호,임석진,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-
We present the circit which can control ac current by varible of inductance in superconductor with applied dc current. For this study, we simulated a proposed circuit using the Pspice program. In the simulation, 'V_r₂decreased with increasing Inductance L. The gain in low frequency 30 MHz is biggest in low resistance. while in high frequency 300 MHz, the gain is biggest in low resistance.
강형곤,임성훈,이재윤,이현수,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
Superconducting thick film was fabricated on Y211 substrate by screen printing method. In this study, 3BaCuO_2 + 2CuO, Y_2O_3+L(BaO+CuO), and Y_2O_3+L(BaO+Cuo)+Ag were used as an ink, respectively. After sintering for 10min. at 970℃, 3 hours at 940℃, and 6 hours at 460℃, the characteristics of smples were measured by SEM and X-ray. Superconducting characteristics of 3BaCuO_2 +2CuO sample were better than others. And others were considered to require higher sintering temperature.
Nam, Hyeong Seok,Kang, Dae Hwan,Kim, Hyung Wook,Choi, Cheol Woong,Park, Su Bum,Kim, Su Jin,Ryu, Dae Gon Baishideng Publishing Group Inc 2017 WORLD JOURNAL OF GASTROENTEROLOGY Vol.23 No.9
<P><B>AIM</B></P><P>To evaluate the safety and efficacy of limited endoscopic sphincterotomy (ES) before placement of self-expandable metal stent (SEMS).</P><P><B>METHODS</B></P><P>This was a retrospective analysis of 244 consecutive patients with unresectable malignant biliary obstruction, who underwent placement of SEMSs following limited ES from December 2008 to February 2015. The diagnosis of malignant biliary obstruction and assessment of patient eligibility for the study was established by a combination of clinical findings, laboratory investigations, imaging and pathological results. All patients were monitored in the hospital for at least 24 h following endoscopic retrograde cholangio pancreatography (ERCP). The incidence of immediate or early post-ERCP complications such as post-ERCP pancreatitis (PEP) and bleeding related to limited ES were considered as primary outcomes. Also, characteristics and complications according to the cancer type were classified.</P><P><B>RESULTS</B></P><P>Among the 244 patients included, the underlying diagnosis was cholangiocarcinoma in 118 patients, pancreatic cancer in 79, and non-pancreatic or non-biliary malignancies in the remaining 47 patients. Early post-ERCP complications occurred in 9 patients (3.7%), with PEP in 7 patients (2.9%; mild, 6; moderate, 1) and mild bleeding in 2 patients (0.8%). There was no significant association between the incidence of post-ERCP complications and the type of malignancy (cholangiocarcinoma <I>vs</I> pancreatic cancer <I>vs</I> others, <I>P</I> = 0.696) or the type of SEMS used (uncovered <I>vs</I> covered, <I>P</I> = 1.000). Patients who had more than one SEMS placed at the first instance were at a significantly higher risk of post-ERCP complications (one SEMS <I>vs</I> two SEMS, <I>P</I> = 0.031). No other factors were predictive of post-ERCP complications.</P><P><B>CONCLUSION</B></P><P>Limited ES is feasible and safe, and effectively facilitates the placement of SEMS, without any significant risk of PEP or severe bleeding.</P>