检索结果-南通市图书馆

Safety of endoscopic ultrasound-guided ethanol ablation for pancreatic cystic lesions: A single-center experience of 214 patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2019年第6期18卷 562-568页

作者： jin ho choi Sang Hyub Lee Young hoon choi Min Su You Bang-Sup Shin Woo Hyun Paik Ji Kon Ryu Yong-Tae Kim Department of Internal Medicine Liver Research Institute Seoul National University College of Medicine

Background:Endoscopic ultrasound-guided ethanol ablation(EUS-EA)for pancreatic cystic lesions(PCLs)has been used in recent years as a feasible treatment modality for low malignant probability PCLs or patients considered high-risk for *** present study aimed to confirm the safety of EUS-EA and to find predictive factors for adverse event(AE).Methods:A retrospective review was performed from the prospectively maintained database of patients who underwent EUS-EA for PCLs from June 2006 to April 2018 at Seoul National University *** primary outcomes of the study were the rates of AEs and severe AEs by *** secondary outcome was the predictive factors of AEs including acute pancreatitis and abdominal ***:A total of 214 patients were evaluated and the diagnoses of PCLs according to cystic fluid analysis and clinical features were as follows:serous cystic neoplasm(32.2%),mucinous cystic neoplasm(26.6%),branch duct type intraductal papillary mucinous neoplasm(BD-IPMN)(29.4%),and pseudocyst(11.7%).Three patients(1.4%)experienced severe ***,AEs occurred in 71(33.2%)***-IPMN(OR:2.87;95%CI:1.05–7.84;P=0.040),multilocular cysts(OR:3.59;95%CI:1.09–11.85;P=0.036),suspected ethanol leakage during procedure(OR:10.68;95%CI:1.98–57.53;P=0.006),and sticky cystic fluid(OR:3.83;95%CI:1.20–12.24;P=0.024)were predictive factors for post-procedural acute *** of uncinate process(OR:2.99;95%CI:1.22–7.35;P=0.017)and PCLs with exophytic portion(OR:3.70;95%CI:1.96–7.01;P<0.001)were predictive factors for post-procedural abdominal ***:EUS-EA is a safe procedure with a very low rate of severe *** seems possible to predict the AEs according to the features of the procedure and PCLs.

关键词： Pancreatic cyst EUS-guided ethanol ablation Adverse events

Folfirinox chemotherapy prolongs stent patency in patients with malignant biliary obstruction due to unresectable pancreatic cancer

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2020年第6期19卷 590-595页

作者： jinwoo Kang Sang Hyub Lee jin ho choi Woo Hyun Paik Dong-Won Ahn Ji Bong Jeong Ji Kon Ryu Yong-Tae Kim Department of Internal Medicine and Liver Research Institute Seoul National University HospitalSeoul National University College of MedicineSeoulKorea Department of Internal Medicine SMG-SNU Boramae Medical CenterSeoulKorea

Background:Stent insertion for biliary decompression to relieve jaundice and subsequent biliary infection is necessary for patients with biliary obstruction caused by pancreatic cancer,and it is important to keep the stent patent as long as ***,few studies have compared stent patency in terms of chemotherapy in patients with pancreatic *** study aimed to evaluate the differences in stent patency in terms of recently evolving ***:Between January 2015 and May 2017,161 patients with pancreatic cancer who had undergone biliary stent insertion with a metal stent were retrospectively *** relationship between chemotherapy and stent patency was ***,overall survival according to the treatment,risk factors for stent patency,and long-term adverse events were ***:Median stent patency was 42 days for patients with the best supportive care and 217 days for patients with chemotherapy(conventional gemcitabine-based chemotherapy and folfirinox)(Phowed the longest median stent patency and overall survival,with 283 days and 466 days,respectively(Pho underwent folfirinox chemotherapy after stent insertion had better stent patency in multivariate analysis(HR=0.26;95%CI:0.12–0.60;P=0.001).Conclusions:Compared with patients who received best supportive care only,patients who underwent chemotherapy after stent insertion had better stent *** prolonged stent patency can be expected for patients with folfirinox than conventional gemcitabine-based chemotherapy.

关键词： Stent patency Malignant distal biliary obstruction Pancreatic cancer Folfirinox Chemotherapy

Acetylsalicylic acid for metal stent in malignant distal common bile duct obstruction:A randomized controlled trial

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2022年第5期21卷 493-499页

作者： jin ho choi Kyong Joo Lee Woo Hyun Paik Namyoung Park Jung Won Chun Sang Hyub Lee Ji Kon Ryu Yong-Tae Kim Department of Internal Medicine Liver Research InstituteSeoul National University College of MedicineSeoulKorea Department of Internal Medicine Yonsei University Wonju College of MedicineWonjuKorea

Background:Endoscopic biliary drainage is the treatment of choice for patients with malignant distal common bile duct ***-expandable metal stents have clinical advantages including an increased duration of patency that may be prolonged by acetylsalicylic acid(ASA)*** aim of this study was to investigate whether ASA had a positive effect on the patency of self-expandable metal stents compared with ***:This prospective,multicenter,double-blinded,and randomized placebo-controlled trial was conducted from October 2017 to May 2020 in *** who underwent palliative endoscopic biliary drainage with self-expandable metal stents for malignant distal bile duct obstruction were enrolled,and allocated to ASA treatment or *** study outcomes were the rate of stent dysfunction at 6 months,duration of stent patency,risk factors for stent dysfunction,and any adverse ***:Interim analysis included 24 and 28 patients in the ASA and placebo groups,*** was no significant difference between the ASA and placebo groups in stent dysfunction(25.0%vs.20.7%,P=0.761)or the duration of stent patency(150.97±10.55 vs.158.07±8.70 days,P=0.497).Six patients experienced suspected ASA-related adverse events,and there was one lethal ***:ASA did not prolong stent *** study was terminated early because of the possibility of serious adverse events related to ASA treatment of these patients receiving palliative care.

关键词： Endoscopic retrograde cholangiopancreatography Self expandable metallic stents Randomized controlled trial Acetylsalicylic acid

In-situ observations of novel single-atom thick 2D tin membranes embedded in graphene

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第3期14卷 747-753页

作者： Xiaoqin Yang Huy Q.Ta Wei Li Rafael G.Mendes Yu Liu Qitao Shi Sami Ullah Alicja Bachmatiuk jinping Luo Lijun Liu jin-ho choi Mark H.Rummeli School of Energy and Power Engineering Xi’an Jiaotong UniversityNo.28Xianning West RoadXian710049China

There is ongoing research in freestanding single-atom thick elemental metal patches,including those suspended in a two-dimensional(2D)material,due to their utility in providing new structural and energetic insight into novel metallic 2D *** pores have shown promise as support systems for suspending such *** study explores the potential of Sn atoms to form freestanding stanene and/or Sn patches in graphene *** atoms were deposited on graphene,where they formed novel single-atom thick 2D planar clusters/patches(or membranes)ranging from 1 to 8 atoms within the graphene *** of three or more atoms adopted either a star-like or close-packed structural *** functional theory(DFT)calculations were conducted to look at the cluster configurations and energetics(without the graphene matrix)and were found to deviate from experimental observations for 2D patches larger than five *** was attributed to interfacial interactions between the graphene pore edges and Sn *** presented findings help advance the development of single-atom thick 2D elemental metal membranes.

关键词： in-situ transmission electron microscopy Sn atoms planar cluster graphene vacancy

Development of vehicle-recognition method on water surfaces using LiDAR data:SPD^(2)(spherically stratified point projection with diameter and distance)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第6期36卷 95-104页

作者： Eon-ho Lee Hyeon Jun Jeon jinwoo choi Hyun-Taek choi Sejin Lee The Department of Mechanical Engineering Kongju National University1223-24 Cheonan-daeroCheonan 31080Republic of Korea Ocean System Engineering Research Division Korea Research Institute of Ships and Ocean Engineering(KRISO)Daejeon 34103Republic of Korea The Division of Mechanical&Automotive Engineering Kongju National University1223-24 Cheonan-daeroCheonan 31080Republic of Korea

Swarm robot systems are an important application of autonomous unmanned surface vehicles on water *** monitoring natural environments and conducting security activities within a certain range using a surface vehicle,the swarm robot system is more efficient than the operation of a single object as the former can reduce cost and save *** is necessary to detect adjacent surface obstacles robustly to operate a cluster of unmanned surface *** this purpose,a LiDAR(light detection and ranging)sensor is used as it can simultaneously obtain 3D information for all directions,relatively robustly and accurately,irrespective of the surrounding environmental *** the GPS(global-positioning-system)error range exists,obtaining measurements of the surface-vessel position can still ensure stability during platoon *** this study,a three-layer convolutional neural network is applied to classify types of surface *** aim of this approach is to redefine the sparse 3D point cloud data as 2D image data with a connotative meaning and subsequently utilize this transformed data for object classification ***,we have proposed a descriptor that converts the 3D point cloud data into 2D image *** use this descriptor effectively,it is necessary to perform a clustering operation that separates the point clouds for each *** developed voxel-based clustering for the point cloud ***,using the descriptor,3D point cloud data can be converted into a 2D feature image,and the converted 2D image is provided as an input value to the *** intend to verify the validity of the proposed 3D point cloud feature descriptor by using experimental data in the ***,we explore the feasibility of real-time object classification within this framework.

关键词： Object classification Clustering 3D point cloud data LiDAR(light detection and ranging) Surface vehicle

Trifunctional robust electrocatalysts based on 3D Fe/N-doped carbon nanocubes encapsulating Co4N nanoparticles for efficient battery-powered water electrolyzers

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第6期6卷 124-139页

作者： Hyung Wook choi hongdae Lee Jun Lu Seok Bin Kwon Dong In Jeong Beum jin Park Jiwon Kim Bong Kyun Kang Gun Jang Dae ho Yoon ho Seok Park SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea Department of Electronic Materials Devicesand Equipment EngineeringSoonchunhyang UniversityAsan CityChungnamRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

Herein,we have designed a highly active and robust trifunctional electrocatalyst derived from Prussian blue analogs,where Co_(4)N nanoparticles are encapsulated by Fe embedded in N-doped carbon nanocubes to synthesize hierarchically structured Co_(4)N@Fe/N-C for rechargeable zinc-air batteries and overall water-splitting *** confirmed by theoretical and experimental results,the high intrinsic oxygen reduction reaction,oxygen evolution reaction,and hydrogen evolution reaction activities of Co_(4)N@Fe/N-C were attributed to the formation of the heterointerface and the modulated local electronic ***,Co_(4)N@Fe/N-C induced improvement in these trifunctional electrocatalytic activities owing to the hierarchical hollow nanocube structure,uniform distribution of Co_(4)N,and conductive encapsulation by Fe/***,the rechargeable zinc-air battery with Co_(4)N@Fe/N-C delivers a high specific capacity of 789.9 mAh g^(-1) and stable voltage profiles over 500 ***,the overall water electrolyzer with Co_(4)N@Fe/N-C achieved better durability and rate performance than that with the Pt/C and IrO2 catalysts,delivering a high Faradaic efficiency of 96.4%.Along with the great potential of the integrated water electrolyzer powered by a zinc-air battery for practical applications,therefore,the mechanistic understanding and active site identification provide valuable insights into the rational design of advanced multifunctional electrocatalysts for energy storage and conversion.

关键词： battery-powered electrolyzers hierarchical structure Prussian blue analog trifunctional electrocatalyst zinc-air battery

Data driven computational design of stable oxygen evolution catalysts by DFT and machine learning:Promising electrocatalysts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 645-655页

作者： Hwanyeol Park Yunseok Kim Seulwon choi ho Jun Kim Department of Display Materials Engineering Soonchunhyang UniversityAsanChung-nam 31538Republic of Korea Department of Electronic Materials Devicesand Equipment EngineeringSoonchunhyang Uni-versityAsanChungnam 31538Republic of Korea Department of Mechanical Engineering Hanyang University ERICA Campus55 Hanyangdaehak-roSangnok-guAnsanGyeonggi-do 15588Republic of Korea

The revolutionary development of machine learning(ML),data science,and analytics,coupled with its application in material science,stands as a significant milestone of the scientific community over the last *** active,stable,and cost-efficient catalysts is crucial for oxygen evolution reaction owing to the significance in a range of electrochemical energy co nversion *** this work,we have demonstrated an efficient approach of high-throughput screening to find stable transition metal oxides under acid condition for high-performance oxygen evolution reaction(OER)catalysts through density functional theory(DFT)calculation and a machine learning algorithm.A methodology utilizing both the Materials Project database and DFT calculations was introduced to assess the acid stability under specific reaction *** upon this,OER catalytic activity of acid-stable materials was examined,highlighting potential OER catalysts that meet the required *** identified IrO_(2),Fe(SbO_(3))_(2),Co(SbO_(3))_(2),Ni(SbO_(3))_(2),FeSbO_(4),Fe(SbO_(3))4,MoWO_(6),TiSnO_(4),CoSbO_(4),and Ti(WO_(4))_(2)as promising catalysts,several of which have already been experimentally discovered for their robust OER performance,while others are novel for experimental exploration,thereby broadening the chemical scope for efficient OER *** of the bond length of TM-O and the first ionization energy were used to unveil the OER activity *** the calculated results,guidance has been derived to effectively execute advanced high-throughput screenings for the discovery of catalysts with favorable ***,the intrinsic correlation between catalytic performance and various atomic and structural factors was elucidated using the ML *** these approaches,we not only streamline the choice of the promising electrocatalysts but also offer insights for the design of varied catalyst models and the discovery of superior c

关键词： Transition metal oxides Oxygen evolution reaction High-throughput screening First-principles calculation Machine learning

Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第1期88卷 1-9,I0001页

作者： Inhyeok Cho Jiwon Yun Boseok Seong Junseok Kim Sun Hee choi ho-Il Ji Sihyuk choi Department of Mechanical Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautics Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Center for Energy Materials Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Center for Hydrogen and Fuel Cell Research Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Science and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

PrBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(PrBSCF) has attracted much research interest as a potential triple ionic and electronic conductor(TIEC) electrode for protonic ceramic fuel cells(PCFCs). The chemical formula for Pr BSCF is AA'B_(2)O_(5+δ), with Pr(A-site) and Ba/Sr(A'-site) alternately stacked along the c-axis. Due to these structural features, the bulk oxygen ion diffusivity is significantly enhanced through the disorder-free channels in the PrO layer;thus, the A site cations(lanthanide ions) play a pivotal role in determining the overall electrochemical properties of layered perovskites. Consequently, previous research has predominantly focused on the electrical properties and oxygen bulk/surface kinetics of Ln cation effects,whereas the hydration properties for PCFC systems remain unidentified. Here, we thoroughly examined the proton uptake behavior and thermodynamic parameters for the hydration reaction to conclusively determine the changes in the electrochemical performances depending on LnBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(LnBSCF,Ln=Pr, Nd, and Gd) cathodes. At 500 ℃, the quantitative proton concentration of PrBSCF was 2.04 mol% and progressively decreased as the Ln cation size decreased. Similarly, the Gibbs free energy indicated that less energy was required for the formation of protonic defects in the order of Pr BSCF hodes, PCFC single cell measurements and analysis of the distribution of relaxation time were further investigated.

关键词： Protonic ceramic fuel cell Cathode Triple ionic and electronic conductor Hydration property Proton uptake Gibbs free energy

Crystallographically vacancy‐induced MOF nanosheet as rational single‐atom support for accelerating CO_(2)electroreduction to CO

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第8期6卷 49-62页

作者： jin Hyuk Cho Joonhee Ma Chaehyeon Lee jin Wook Lim Youngho Kim ho Yeon Jang Jaehyun Kim Myung‐gi Seo Youngheon choi Youn Jeong Jang Sang Hyun Ahn ho Won Jang Seoin Back Jong‐Lam Lee Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Lotte Chemical R&D Center DaejeonRepublic of Korea Department of Chemical Engineering Hanyang UniversitySeoulRepublic of Korea School of Chemical Engineering and Material Science Chung‐Ang UniversitySeoulRepublic of Korea

To attain a circular carbon economy and resolve CO_(2)electroreduction technology obstacles,single‐atom catalysts(SACs)have emerged as a logical option for electrocatalysis because of their extraordinary catalytic *** SACs,metal–organic frameworks(MOFs)have been recognized as promising support materials because of their exceptional ability to prevent metal *** study shows that atomically dispersed Ni single atoms on a precisely engineered MOF nanosheet display a high Faradaic efficiency of approximately 100%for CO formation in H‐cell and three‐compartment microfluidic flow‐cell reactors and an excellent turnover frequency of 23,699 h−1,validating their intrinsic catalytic *** results suggest that crystallographic variations affect the abundant vacancy sites on the MOF nanosheets,which are linked to the evaporation of Zn‐containing organic linkers during ***,using X‐ray absorption spectroscopy and density functional theory calculations,a comprehensive investigation of the unsaturated atomic coordination environments and the underlying mechanism involving CO^(*)preadsorbed sites as initial states was possible and provided valuable insights.

关键词： 2‐dimensional material carbon dioxide reduction metal-organic frameworks single‐atom catalysts vacancy sites