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Gil-Chun Park,Shin Hwang,Dong-Hwan Jung,Tae-Yong Ha,Gi-Won Song,Chul-Soo Ahn,Deok-Bog Moon,Ki-Hun Kim,Young-In Yoon,Hwui-Dong Cho,Jin-Uk Choi,Sung-Gyu Lee 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.99 No.5
Purpose: A cryopreserved iliac artery homograft (IAH) has not been considered suitable for middle hepatic vein (MHV) reconstruction during living donor liver transplantation (LDLT), primarily due to the low patency from its small diameter. We revised our surgical techniques for MHV reconstruction using an IAH to improve its patency. Methods: This study analyzed the causes of early conduit occlusion and developed revised techniques to address this that had clinical application. Results: The potential risk factors for early conduit occlusion were the small IAH size, small graft in the segment V vein (V5) and segment VIII vein (V8) opening, and small recipient MHV-left hepatic vein stump. These factors were reflected to our revised surgical methods which included endarterectomy of the atherosclerotic plaque, unification of the internal and external iliac artery branches for large V5, and branch-patch arterioplasty for large V8. IAH endarterectomy, branch unification technique, and branch-patch arterioplasty were applied to 8, 5, and 5 patients, respectively and resulted in 1-month occlusion rates of 37.5%, 20.0%, and 40.0%, respectively. The overall patency rates of the IAH-MHV conduits in our 18 patients were 66.7% at 1 month, 38.9% at 3 months, and 33.3% at 1 year. Conclusion: Our refined MHV reconstruction using an IAH improved short-term MHV conduit patency, but did not effectively prevent early conduit occlusion, particularly with a small- or medium-sized IAH. Individualized reconstruction designs during LDLT operation are needed when an IAH is used for a modified right liver graft.
Anti-Oxidative and Anti-Inflammation Activities of Pork Extracts
Gil, Juae,Kim, Dongwook,Yoon, Seok-Ki,Ham, Jun-Sang,Jang, Aera Korean Society for Food Science of Animal Resource 2016 한국축산식품학회지 Vol.36 No.2
This study was conducted to evaluate the antioxidative and anti-inflammatory effects of boiled pork powder (BPP) and hot water extract powder (HWEP) from 4 cuts of meat from Landrace × Yorkshire × Duroc (LYD). The highest DPPH radical scavenging activities determined were from BPP of Boston butt (13.65 M TE) and HWEP of loin (19.40 M TE) and ham (21.45 M TE). The 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging activities of BPP from shoulder ham (39.28 M TE) and ham (39.43 M TE) were higher than those of other meat cuts, while HWEP of ham exhibited the highest ABTS radical scavenging activity. A higher oxygen radical absorbance capacity was determined for BPP from ham (198.35 M TE) and in HWEP from loin (204.07 M TE), Boston butt (192.85 M TE), and ham (201.36 M TE). Carnosine content of BPP and HWEP from loin and were determined to be 106.68 and 117.77 mg/g on a dry basis, respectively. The anserine content of BPP (5.26 mg/g, dry basis) and HWEP (6.79 mg/g, dry basis) of shoulder ham exhibited the highest value as compared to the extracts from the other meat cuts. The viability of RAW 264.7 cells was increased with increasing HWEP from loin and ham treatment. In addition, the expression of IL-6 and TNF-α was significantly reduced by HWEP from loin and ham, in a dose dependent manner. These results suggested that boiled pork and hot water extract of pork have antioxidative and cytokine inhibitory effects.
Sung-Gyu Lee,Shin Hwang,Tae Yong Ha,Gi Won Song,Dong-Hwan Jung,Gil-Chun Park,Chul-Soo Ahn,Deok-Bog Moon,Ki Hun Kim,Young-In Yoon,Yo Han Park,Hui-Dong Cho,Yong-Kyu Chung,Sang-Hyun Kang,Jin-Uk Choi,Sung 대한이식학회 2019 Korean Journal of Transplantation Vol.33 No.4
Background: Autologous portal vein Y-graft (PYG) interposition has been the standard procedure for reconstruction of double portal vein (PV) orifices of right liver grafts during living donor liver transplantations. However, it has the disadvantage of being vulnerable to anastomotic stenosis. A refined technique of conjoined unification venoplasty (CUV) was developed to secure PV reconstruction. Methods: We reviewed the surgical outcomes in PV reconstructions using CUVs in 21 cases which were followed up for >3 years. Results: The mean age of recipients was 51.7±4.9 years. The model for end-stage liver disease score was 15.3±6.4. The graft-recipient weight ratio was 1.12±0.21. Recipient PYGs were harvested in all cases. All living donors were blood relatives or relatives through marriage with type III PV anomalies. The number of right liver graft PV orifices was two in 19 cases and three in two cases. For the central intervening vein patch, a PV segment was used in six cases, and an autologous greater saphenous vein patch was used in the remaining 15 cases. The 21 patient cohort displayed a 100% 4-year patient survival rate. None of them underwent any PV interventions including interventional stenting. Serial follow-up computed tomography scans revealed that the reconstructed PV showed early reshaping with a stable streamlined configuration for over 3 years. Conclusions: PV reconstruction using the CUV technique appears to be significantly more effective in preventing PV complications. We believe that CUV is a useful technique to reconstruct right liver grafts with multiple PV orifices.
A Design of Protocol for Low Energy Consumption of Wireless Sensor Nodes
Gil-Cheol Park,Yoon-Su Jeong,Yeoul-Ouk Sung,Yong-Tae Kim 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.4
To prolong lifetime of wireless sensor network, it is crucial to minimize energy consumption at each node with limited energy capacity in a wireless sensor network. The routing protocol for delivering data is expected to find transmission paths which balance the energy consumption across the nodes. This paper proposes an efficient routing protocol called the Max-path Max-Energy selection routing Protocol(MMEP) which is designed to expand the network lifespan with the balanced energy utilization. The simulations done in the network simulator NS-2 to simulate other protocols in order to verify our results in a closer to real environment. Simulation results show that our protocol clearly improves the network lifetime over LEACH and LEACH-C. Our protocol successfully balances the energy consumption over the network, and achieves a remarkable network lifetime improvement as highly as 15%.
Sang-Eun Park,Hyun-Na Koo,Changmann Yoon,Gil-Hah Kim 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most important pest species devastating many horticultural, ornamental crops and fruit trees. Difficulty in managing this mite is largely attributed to its ability to develop resistance to many acaricides. Development of 3,700 folds resistance to etoxazole was found in the population of T. urticae collected from rose greenhouses in Buyeo, Chungnam Province in August 2000. This population has been selected for eleven years with etoxazole (over 500 times), and increased over 5,000,000 fold in resistance as compared with susceptible strain (S). Etoxazole-resistant strain was shown to be maternally inherited. The objective of this study was to determine whether resistance of T. urticae to etoxazole was linked with point mutations in the mitochondrial gene. DNA sequencing of cytochrome c oxidase subunit I (COX1), COX2, COX3, cytochrome b (CYTB), NADH dehydrogenase subunit 1 (ND1), ND2, ND3, ND4, ND5, and ND6 were analyzed by comparing two isogenic etoxazole-susceptible (EtoS) and etoxazole-resistant (EtoR) strains. As a result, all genes revealed no point mutations between the two strains.
Yoon, Jin Tae,Jeong, Young Gyu,Lee, Sang Cheol,Min, Byung Gil John Wiley Sons, Ltd. 2009 Polymers for advanced technologies Vol.20 No.7
<P>Poly(lactic acid)-grafted multiwalled carbon nanotubes (MWNT-g-PLA) were prepared by the direct melt-polycondensation of L-lactic acid with carboxylic acid-functionalized MWNT (MWNT-COOH) and then mixed with a commercially available neat PLA to prepare PLA/MWNT-g-PLA nanocomposites. Morphological, thermal, mechanical, and electrical characteristics of PLA/MWNT-g-PLA nanocomposites were investigated as a function of the MWNT content and compared with those of the neat PLA, PLA/MWNT, and PLA/MWNT-COOH nanocomposites. It was identified from FE-SEM images that PLA/MWNT-g-PLA nanocomposites exhibit good dispersion of MWNT-g-PLA in the PLA matrix, while PLA/MWNT and PLA/MWNT-COOH nanocomposites display MWNT aggregates. As a result, initial moduli and tensile strengths of PLA/MWNT-g-PLA composites are much higher than those of neat PLA, PLA/MWNT, and PLA/MWNT-COOH, which stems from the efficient reinforcing effect of MWNT-g-PLA in the PLA matrix. In addition, the crystallization rate of PLA/MWNT-g-PLA nanocomposites is faster than those of neat PLA, PLA/MWNT, and PLA/MWNT-COOH, since MWNT-g-PLA dispersed in the PLA matrix serves efficiently as a nucleating agent. It is interesting that, unlike PLA/MWNT nanocomposites, surface resistivities of PLA/MWNT-g-PLA nanocomposites did not change noticeably depending on the MWNT content, demonstrating that MWNTs in PLA/MWNT-g-PLA are wrapped with the PLA chains of MWNT-g-PLA. Copyright © 2008 John Wiley & Sons, Ltd.</P>
Yoon, Sukeun,Lee, Sung-Yun,Nguyen, Tuan Loi,Kim, Il Tae,Woo, Sang-Gil,Cho, Kuk Young Elsevier 2018 Journal of alloys and compounds Vol.731 No.-
<P><B>Abstract</B></P> <P>Dual-phase Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> and carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres were synthesized using a simple solvothermal method followed by post-heat treatment. The Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> materials comprised porous spheres with 3-dimensional interconnected microsphere architectures, with a homogeneous dispersion of carbon coating the Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> spheres. As the anode for a Li-ion battery, the dual-phase carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres delivered a high gravimetric capacity of >247 mA h g<SUP>−1</SUP> with good cycling performance, as well as a high rate capability. The unique and advantageous characteristics of the dual-phase carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres for high performance Li-ion batteries are attributed to the synergistic effects of the porous, two-phase structure of the material. Furthermore, the conductive carbon matrix on the spheres provided facile electron transport and an effective alleviation of mechanical strain during cycling. The high electrochemical performance of the dual-phase carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres recommends them as a promising anode material for future Li-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Controlled synthesis of dual-phase carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres. </LI> <LI> Synergistic effects of the porous, two-phase structure of the material. </LI> <LI> Electrochemical reaction behavior of carbon-coated Nb<SUB>2</SUB>O<SUB>5</SUB>/TiNb<SUB>2</SUB>O<SUB>7</SUB> porous spheres with lithium. </LI> </UL> </P>
Sang-Hyun Kang,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Jung-Man Namgoong,Young-In Yoon,Hui-Dong Cho,Jae-Hyun Kwon,Yong-Kyu Chung,Jin Uk Ch 대한이식학회 2020 Korean Journal of Transplantation Vol.34 No.1
Background: To understand the changing demands and recent trends in the indications for living donor liver transplantation (LDLT), the present study aimed to analyze the indications for LDLT performed in a high-volume transplantation center over 10 years. Methods: The liver transplantation database at our institution was searched to identify patients who underwent LDLT during a 10-year period from January 2008 to December 2017. The study subjects (n=3,145) were divided into two groups: adult patients (n=3,019, 92.7%) and pediatric patients (n=126, 3.9%). Results: In the adult recipients, the primary diagnoses were hepatitis B virus (HBV)- associated liver cirrhosis (n=1,898, 62.9%), alcoholic liver disease (n=482, 16.0%), hepatitis C virus-associated cirrhosis (n=203, 6.7%), acute liver failure (n=127, n=4.2%), and other diseases (n=157, 5.2%). The mean Model for End-Stage Liver Disease score was 15.6±8.8 (range, 6–40). The proportion of patients with HBV-associated liver disease gradually decreased, but the proportion of those with alcoholic liver disease increased. Hepatocellular carcinoma (HCC) was diagnosed in 1,467 patients (48.6%). The mean proportion of patients with HCC was 63.1% among those with HBVassociated liver disease. In pediatric recipients, the primary diagnoses were biliary atresia (n=51, 40.5%), liver failure of various causes (n=37, 29.4%), metabolic disease (n=22, 17.5%), hepatoblastoma (n=12, 9.5%), and infectious diseases (n=4, 3.2%). Conclusions: Our results showed that there were some significant changes in the indications of LDLT. We believe that our results may reflect the real changes in the indications of LDLT and they will be useful for predicting further changes in the future.