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( Byeong-gon Na ),( Dong-hwan Jung ),( Yong-kyu Chung ),( Sang-Hyun Kang ),( I-ji Jeong ),( Jin-uk Choi ),( Min-jae Kim ),( Sang-hoon Kim ),( Hwui-dong Cho ),( Young-in Yoon ),( Shin Hwang ),( Ki-hun 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Living donor hepatectomy (LDH) is performed widely as a part of living donor liver transplantation. The type and length of incision have been considered important because of the quality of life, such as the cosmetic effect. We describe herein the minimal incision for LDH to evaluate the safety and feasibility. Methods: We enrolled 63 consecutive cases of donor hepatectomy using a subcostal or upper midline minimal (9-12cm) incision depending on graft type and size between Jul and Dec in 2019 at a single center. Donor demographics, preoperative data, and postoperative outcomes were analyzed. Results: The mean age of the donors was 32.8 ± 10.3 yrs, and 32 (50.8%) donors were male. The mean operation time was 400.5 ± 69.5 minutes and the mean hospital stay was 9.4 ± 3.7 days. The graft types comprised 52 (82.5%) of the modified right lobe, 6 (9.5%) of the modified extended right lobe, and 5 (7.9%) of the extended left lobe. The portal vein types were I, II, and III in 59 (93.7%), 1 (1.6%), and 3 (4.8%), respectively. The bile duct types were A, B, C1, and C2 in 46 (73.0%), 8 (12.7%), 3 (4.8%), and 6 (9.5%). There were one (0.02%) case of bile leakage, and one (0.02%) case of abdominal wall bleeding postoperatively. Conclusions: LDH using minimal incision was a safe and feasible option showing an acceptable incidence of complications despite anatomical variations.
( Byeong-gon Na ),( Gil-chun Park ),( Min-jae Kim ),( Sang-hoon Kim ),( Yong-kyu Chung ),( Sang-hyun Kang ),( I-ji Jeong ),( Jin-uk Choi ),( Hwui-dong Cho ),( Young-in Yoon ),( Shin Hwang ),( Ki-hun K 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: When the donor’s left lobe volume is <30%, donor selection for the right posterior section graft (RPSG) is based on the type III portal vein (PV) anatomical variation. Herein, we validated the selection of a donor with a type III PV variation for RPSG to prevent biliary complications (BCs) after single-graft (SG) and dual-graft (DG) living-donor liver transplantation (LDLT). Methods: The clinical data of recipients and donors with a type III PV variation for LDLT using an RPSG performed between January 2004 and June 2018 were retrospectively collected and analyzed to determine the occurrence of BCs. Results: The 26 LDLTs performed using an RPSG, including 20 DG LDLT cases, accounted for 0.6% of all LDLT cases (n=4,292). BCs developed in 6 recipients (23.0%), including biliary stricture in 4 (15.3%) and bile leakage in 2 (7.6%). No vascular complications occurred. The RPSG volume was significantly smaller in recipients with BCs than in those without BCs (400.8±79.9 vs. 504.1±96.5 ml, P=0.015). The bile duct types were A, B, C1, C2, and D in 6 (18.8%), 5 (15.6%), 3 (9.4%), 13 (40.6%), and 5 patients (15.6%), respectively. All the RPSGs had a single-orifice bile duct. The bile duct size of the RPSG was relatively smaller in recipients with BCs than in those without BCs (2.8±1.0 vs. 3.6±1.4 mm, P=0.237). Conclusions: When using an RPSG for SG and DG LDLTs, the selection of a donor with a type III PV variation can be feasible to prevent BCs.
소결 조건 변화에 따른 직류 피뢰기용 ZnO 바리스터의 미세구조 및 전기적 성질에 관한 연구
김석수,최익순,박태곤,조이곤,박춘현,Kim, Seok-Sou,Choi, Ike-Sun,Park, Tae-Gon,Cho, I-Gon,Park, Choon-Hyun 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
The microstructure and electrical characteristics of A ∼ C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature was 1130 $^{\circ}C$ and speeds of pusher were A: 2 mm/min, B: 4 mm/min, C: 6 mm/min, respectively, were investigated. The experimental results obtained from this study were summarized as follows: The sintering density of A ∼C's ZnO varistors sintered at 1130 $^{\circ}C$ were decreased by sintering keep time to shorten, such as A: 9hour, B: 4.5hour and C: 3hour. A's ZnO varistor exhibited good densification nearly 98 % of theory density. In the microstructure, A∼C's ZnO varistors fabricated variable sintering condition was consisted of ZnO grain(ZnO), spinel phase(Z $n_{2.33}$S $b_{0.67}$ $O_4$), Bi-rich phasc(B $i_2$ $O_3$), wholly. Varistor voltage of A∼C's ZnO varistors sintered at 1130 $^{\circ}C$ increased in order A <B <C's ZnO varistors. C's ZnO varistor exhibited good characteristics that nonlinear exponent was 31.70. Leakage current of A ∼ C's ZnO varistors exhibited below 2 ㎃ at rated voltage. Lightning impulse residual voltage of A's ZnO varistor suited standard characteristics, which was 3.85kV at 2.5kA, 4.4 kV at 5kA and 5.16 kV at 10 kA. After continuous lightning impulse current test of A's ZnO varistor exhibited good discharge characteristics which ZnO varistor reveals no evidence of puncture, flashover, cracking in visual examination. After high current impulse test of A's ZnO varistor exhibited good discharge characteristics, which variation rate of residual voltage was 0.4 % before and after test, and revealed no evidence. evidence.