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Biomimetic Fe_(7)S_(8)/Carbon electrocatalyst from[FeFe]-Hydrogenase for improving pH-Universal electrocatalytic hydrogen production Special Collection:Aggregation-Induced Processes and Functions

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Aggregate 2024年第1期5卷 451-459页

作者： Dohun Kim Subramani Surendran Sejin im Jaehyoung Lim Kyoungsuk Jin Ki Tae Nam uk Sim Department of Energy Science&Engineering Daegu Gyeongbuk Institute of Science&Technology(DGIST)DaeguRepublic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea Department of Chemistry Korea UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoulRepublic of Korea

Efficient and cost-effective electrocatalysts that can operate across a wide range of pH conditions are essential for green hydrogen *** by biological systems,Fe_(7)S_(8)nanoparticles incorporated on polydopamine matrix electrocatalyst were synthesized by co-precipitation and annealing *** resulting Fe_(7)S_(8)/C electrocatalyst possesses a three-dimensional structure and exhibits enhanced electrocatalytic performance for hydrogen production across various pH ***,the Fe_(7)S_(8)/C electrocatalyst demonstrates exceptional activity,achieving low overpotentials of 90.6,45.9,and 107.4 mV in acidic,neutral,and alkaline environments,*** impedance spectroscopy reveals that Fe_(7)S_(8)/C exhibits the lowest charge transfer resistance under neutral conditions,indicating an improved proton-coupled electron transfer ***-wave electron paramagnetic resonance results confirm a change in the valence state of Fe from 3+to 1+during the hydrogen evolution reaction(HER).These findings closely resemble the behavior of natural[FeFe]-hydrogenase,known for its superior hydrogen production in neutral *** remarkable performance of our Fe_(7)S_(8)/C electrocatalyst opens up new possibilities for utilizing bioinspired materials as catalysts for the HER.

关键词： biomimetic electrocatalyst hydrogen production renewable energy

Interfacial modulation of bifunctional electrolyte additive engineering for dendrite-free and robust lithium metal anode

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Journal of Energy Chemistry 2024年第10期97卷 120-127,I0003页

作者： Mahammad Rafi Shaik Yongmin Park Young-Kwang Jung Won Bin im Division of Materials Science and Engineering Hanyang University222Wangsimni-roSeongdongguSeoul 0473Republic of Kor Department of Chemical Engineering and Biotechnology University of CambridgeCambridge CB3 OASUK

Anode materials for rechargeable electric car batteries are obtained from Li-metal owing to their extremely high specific capacity and low redox ***,safety concerns related to dendrite formation on the anode surface caused by the uneven distribution of Li-ions during the discharge process interfere with the use of Li-metal in industrial *** this study,methyl vinyl sulfone(MVS),a sulfone-based functional electrolyte additive,is used in an additive engineering strategy to control Lielectrolyte interactions and address the aforementioned *** dendrite growth may be restricted,and transition metal degradation on the surface of the cathode can be reduced by the MVS-derived functional electrolyte additive interfacial *** electrochemical performance of an ethylene carbonate/dimethyl carbonate(EC/DMC)+1 wt% MVS Li-metal anode of a Li||Li symmetric cell exhibits remarkable cycle stability,maintaining a low overvoltage for over 750 h at 1 mA cm^(-2),and capacity of 1 mA h cm^(-2).Additionally,LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) full cells with the MVS additive exhibit enhanced electrochemical stability for 250 cycles at a current density of 100 mA g^(-1).This study provides an innovative approach for stabilizing the metal-electrolyte interfacial layer that may be used for practical applications in metal-based rechargeable batteries.

关键词： Lithium rechargeable battery Dendrite-free Electrolyte additive Bifunctional electrolyte Interfacial layer

Ultrasonic Approach of Rayleigh Pitch-Catch Contact Ultrasound Waves on CFRP Laminated Composites

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Journal of Materials Science & Technology 2008年第3期24卷 407-409页

作者： In-Young Yang Kwang-Hee im uk Heo David K Hsu Je-Woong Park Hak-Joon Kim Sung-Jin Song School of Mechanical Eng. Chosun Univ Department of Automotive Eng. Woosuk Univers-ity Center for Nondestructive Evaluation Iowa State University Dept.of Naval Arch.and Ocean Eng. Chosun Univ School of Mechanical Eng. Sungkyunkwan University

CFRP （carbon fiber reinforced plastics） composite materials have wide applicability because of their inherent design flexibility and improved material properties. However, impacted composite structures have 50%-75% less strength than undamaged structures. In this work, a CFRP composite material was nondestructively characterized in order to ensure product quality and structural integrity of CFRP and one-sided pitch-catch technique was developed to measure impacted-damaged area by using an automated-data acquisition system in an immersion tank. A pitch-catch signal was found to be more sensitive than normal incidence backwall echo of longitudinal wave under defect conditions in the composite.

关键词： impact damages C-scanner Carbon fiber reinforced plastics (CFRP) Pitchcatch mode

improved rate-distortion optimized video coding using non-integer bit estimation and multiple Lambda search

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Frontiers of Computer Science 2016年第1期10卷 157-166页

作者： Sio Kei im Mohammad Mahdi GHANDI MPI-QMUL Information Systems Research Centre Macao Polytechnic Institute Macao China Department of Electronic Systems Engineering University of Essex Colchestey CO4 3SQ UK

Many modern video encoders use the Lagrangian rate-distortion optimization （RDO） algorithm for mode deci- sions during the compression procedure. For each encoding stage, this approach involves minimizing a cost, which is a function of rate, distortion and a multiplier called Lambda. This paper proposes to improve the RDO process by applying two modifications. The first modification is to increase the ac- curacy of rate estimation, which is achieved by computing a non-integer number of bits for arithmetic coding of the syntax elements. This leads to a more accurate cost computation and therefore a better mode decision. The second modification is to search and adjust the value of Lambda based on the char- acteristics of each coding stage. For the encoder used, this paper proposes to search multiple values of Lambda for the intra-4x4 mode decision. Moreover, a simple shift in Lambda value is proposed for motion estimation. Each of these modi- fications offers a certain gain in RDO performance, and, when all are combined, an average bit-rate saving of up to 7.0% can be achieved for the H.264/AVC codec while the same concept is applicable to the H.265/HEVC codec as well. The extra added complexity is contained to a certain level, and is also adjustable according to the processing resources available.

关键词： rate distortion optimization Lambda adjust-ment non-integer bit estimation H.264/AVC H265/HEVCvideo coding

Efficient solar fuel production enabled by an iodide oxidation reaction on atomic layer deposited MoS_(2)

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Carbon Energy 2023年第12期5卷 200-214页

作者： Young Sun Park Gyumin Jang Inkyu Sohn Hyungsoo Lee Jeiwan Tan Juwon Yun Sunihl Ma Jeongyoub Lee Chan uk Lee Subin Moon Hayoung im Seung-Min Chung Seungho Yu Hyungjun Kim Jooho Moon Department of Materials Science and Engineering Yonsei UniversitySeoulRepublic of Korea School of Electrical and Electronic Engineering Yonsei UniversitySeoulRepublic of Korea Energy Storage Research Center Korea Institute of Science and TechnologySeoulRepublic of Korea

Oxygen evolution reaction(OER)as a half-anodic reaction of water splitting hinders the overall reaction efficiency owing to its thermodynamic and kinetic *** oxidation reaction(IOR)with low thermodynamic barrier and rapid reaction kinetics is a promising alternative to the ***,we present a molybdenum disulfide(MoS_(2))electrocatalyst for a high-efficiency and remarkably durable anode enabling ***_(2)nanosheets deposited on a porous carbon paper via atomic layer deposition show an IOR current density of 10 mA cm^(–2)at an anodic potential of 0.63 V with respect to the reversible hydrogen electrode owing to the porous substrate as well as the intrinsic iodide oxidation capability of MoS_(2)as confirmed by theoretical *** lower positive potential applied to the MoS_(2)-based heterostructure during IOR electrocatalysis prevents deterioration of the active sites on MoS_(2),resulting in exceptional durability of 200 ***,we fabricate a two-electrode system comprising a MoS_(2)anode for IOR combined with a commercial Pt@C catalyst cathode for hydrogen evolution ***,the photovoltaic–electrochemical hydrogen production device comprising this electrolyzer and a single perovskite photovoltaic cell shows a record-high current density of 21 mA cm^(–2)at 1 sun under unbiased conditions.

关键词： iodide oxidation reaction molybdenum sulfide photovoltaic-electrochemical hydrogen production solar hydrogen

Role of adjuvant chemoradiotherapy and chemotherapy in patients with resected gallbladder carcinoma: a multiinstitutional analysis (KROG 19-04)

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Cancer Biology & Medicine 2022年第6期19卷 931-944页

作者： Sung uk Lee Jinsil Seong Tae Hyun Kim Jung Ho im Woo Chul Kim Kyubo Kim Hae Jin Park Tae Gyu Kim Youngkyong Kim Bae Kwon Jeong Jin Hee Kim Byoung Hyuck Kim Taek-Keun Nam Center for Proton Therapy and Center for Liver and Pancreatobiliary Cancer National Cancer CenterGoyang 10408Korea Department of Radiation Oncology Yonsei Cancer CenterYonsei University College of MedicineSeoul 03722Korea Department of Radiation Oncology CHA Bundang Medical CenterCHA University School of MedicineSeongnam 13497Korea Department of Radiation Oncology Inha University HospitalInha University School of MedicineIncheon 22332Korea Department of Radiation Oncology Ewha Womans University Mokdong HospitalEwha Womans University College of MedicineSeoul 07985Korea Department of Radiation Oncology Hanyang University Medical CenterHanyang University College of MedicineSeoul 04763Korea Department of Radiation Oncology Samsung Changwon HospitalSungkyunkwan University School of MedicineChangwon 51353Korea Department of Radiation Oncology Kyung Hee University HospitalKyung Hee University College of MedicineSeoul 02447Korea Department of Radiation Oncology Gyeongsang National University HospitalGyeongsang National University College of MedicineJinju 52727Korea Department of Radiation Oncology Dongsan Medical CenterKeimyung University School of MedicineDaegu 41931Korea Department of Radiation Oncology Seoul Metropolitan Government Seoul National University Boramae Medical CenterSeoul 07061Korea Department of Radiation Oncology Chonnam National University Hwasun HospitalChonnam National University College of MedicineHwasun 58128Korea

Objective:The effectiveness of adjuvant treatments for resected gallbladder carcinoma(GBC)has remained unclear due to lack of randomized controlled trials;thus,the aim of present study was to evaluate the role of adjuvant treatments,including chemoradiotherapy(CRT)and/or chemotherapy(CTx),in patients with resected ***:A total of 733 GBC patients who received curative-intent surgical resection were identified in a multi-institutional *** 733 patients,372(50.8%)did not receive adjuvant treatment,whereas 215(29.3%)and 146(19.9%)received adjuvant CTx and CRT,*** locoregional recurrence-free survival(LRFS),recurrence-free survival(RFS),and overall survival(OS)of the adjuvant treatment groups were compared according to tumor stage(stage II *** III–IV).Results:In stage II disease(n=381),the 5-year LRFS,RFS,and OS were not significantly different among the no-adjuvant therapy,CTx,and CRT groups,and positive resection margin,presence of perineural invasion,and Nx classification were consistently associated with worse LRFS,RFS,and OS in the multivariate analysis(P<0.05).For stage III–IV(n=352),the CRT group had significantly higher 5-year LRFS,RFS,and OS than the no-adjuvant therapy and CTx groups(67.8%,45.2%,and 56.9%;37.9%,28.8%,and 35.4%;and 45.0%,30.0%,and 45.7%,respectively)(P<0.05).Conclusions:CRT has value as adjuvant treatment for resected GBC with stage III–IV *** study is needed for stage II disease with high-risk features.

关键词： Gallbladder cancer adjuvant treatment chemoradiotherapy locoregional recurrence-free survival overall survival

A Computational Model for the Prediction of Seam Pucker

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Journal of China Textile University(English Edition) 1998年第4期15卷 31-35页

作者： FanJ.Institute of Textiles and Clothing, The Hong Kong Polytechnic University,Hung Hom, Kowloon, Hong KongStylios G.Department of Industrial Technology, Bradford University,BD71 DP, uk

This paper reports on a computational model established based on discriminant analysis for predicting the occur-rence of seam pucker and advising on the correction of causing variables (e. g. fabric properties) to prevent seam pucker. The model has a self - updating feature, viz. automatically up - dating model parameters to im-prove the reliability of the model as new data becomes available. It has been successfully implemented in a re-cently developed sewability system.

关键词： Seam pucker discriminant analysis clothing fabric sewing.

Factors impacting nanoindentation testing results of the cuticle of dung beetle Copris ochus Motschulsky

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Journal of Bionic Engineering 2004年第4期1卷 221-230页

作者： TONG Jin , SUN Ji-yu , CHEN Dong-hui , ZHANG Shu-jun 1 1 1 2 1. Key Laboratory for Terrain-Machine Bionics Engineering (Ministry of Education, China), Jilin University, 5988 Renmin Street, Changchun 130022, P. R. China 2. Department of Multi-media and Computing, University of Gloucestershire, Cheltenham, The Park, GL50 2QF, uk. 1 Key Laboratory for Terrain-Machine Bionics Engineering(Ministry of Education China) Jilin University 5988 Renmin Street Changchun 130022 P. R. China Department of Multi-media and Computing University of Gloucestershire Cheltenham The Park GL50 2QF UK.

The cuticle of dung beetle is a layered composite material in micro- or nano-scale. Dung beetle can fly, walk and dig. It can shovel and compact dung of mammals into balls. It use foreleg to walk, midleg and hindleg to hold and impel dung ball. Its two foreleges as digging legs are developed. The factors impacting the nanoindentation testing results of the femur cuticle of forelegs of dung beetle Copris ochus Motschulsky were examined. The nanomechanical test instrument used for the tests was Hysitron nanomechanical system. The results shown that the holding time and loading time are important factors im- pacting the accuracy of such indentation properties as reduced modulus (Er) and the harness ( H ) of the femur cuticle of the forelegs of dung beetle Copris ochus Motschulsky in nanoscale. There exists a threshold holding time of 20 s for the reduced modulus of the femur cuticle. The tests of nanoindentation creep property and the regression analysis of relationship between the depth increment at the maximum load and the time further confirmed the correction of the above threshold holding time. There exist visco-elastic-plastic behaviour and creep phenomenon in the femur cuticle during indenting. Its creep property during the holding procedure at maximum load can be regressed by a general logarithmic equation. The equation fitted by the testing data is ? h = 54.83452 ln(0.00723t +1.00486), where, ? h is the depth increment at the maximum load and t is the time.

关键词： insect dung beetle cuticle nanoindentation holding time loading time creep 1

妊娠期怀疑肺栓塞的CT肺血管成像检查的质量

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国际医学放射学杂志 2009年第1期32卷 94-94页

作者： J.M. U-King-im S.J. Freeman T. Boylan H.K. Cheow 马可云 University Department of Radiology Addenbrooke’s Hospital and the University of Cambridge Cambridge CB22QQ UK

本研究的主要目的是评价怀疑肺栓塞的妊娠期人群CT肺血管成像（CTPA）检查的质量。我们回顾了2005年1月——2006年12月间进行过CTPA检查的连续的40例妊娠病人，连续的40名年龄匹配的非妊娠女性作为对照组。以随机和双盲的方式，由2名意... 详细信息

本研究的主要目的是评价怀疑肺栓塞的妊娠期人群CT肺血管成像（CTPA）检查的质量。我们回顾了2005年1月——2006年12月间进行过CTPA检查的连续的40例妊娠病人，连续的40名年龄匹配的非妊娠女性作为对照组。以随机和双盲的方式，由2名意见一致的放射科医生对整体影像质量进行了主观分级。

关键词： CT CT肺动脉成像肺动脉栓塞妊娠放射剂量