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Long-lasting,reinforced electrical networking in a high-loading Li_(2)S cathode for high-performance lithium–sulfur batteries

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Carbon Energy 2023年第8期5卷 1-14页

作者： Hun kim Kyeong-jun min Sangin Bang Jang-Yeon Hwang jung Ho kim Chong SYoon Yang-Kook Sun Department of Energy Engineering Hanyang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangjuRepublic of Korea Institute for Superconducting&Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongNew South WalesNorth WollongongAustralia Department of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea

Realizing a lithium sulfide(Li_(2)S)cathode with both high energy density and a long lifespan requires an innovative cathode design that maximizes electrochemical performance and resists electrode ***,a high-loading Li_(2)S-based cathode with micrometric Li_(2)S particles composed of two-dimensional graphene(Gr)and one-dimensional carbon nanotubes(CNTs)in a compact geometry is developed,and the role of CNTs in stable cycling of high-capacity Li–S batteries is *** a dimensionally combined carbon matrix,CNTs embedded within the Gr sheets create robust and sustainable electron diffusion pathways while suppressing the passivation of the active carbon *** a unique point,during the first charging process,the proposed cathode is fully activated through the direct conversion of Li_(2)S into S_(8) without inducing lithium polysulfide *** direct conversion of Li_(2)S into S_(8) in the composite cathode is ubiquitously investigated using the combined study of in situ Raman spectroscopy,in situ optical microscopy,and cryogenic transmission electron *** composite cathode demonstrates unprecedented electrochemical properties even with a high Li_(2)S loading of 10 mg cm^(–2);in particular,the practical and safe Li–S full cell coupled with a graphite anode shows ultra-long-term cycling stability over 800 cycles.

关键词： carbon nanotubes electrical network high energy high loading Li_(2)S cathode lithium-sulfur batteries

Reduced graphene oxide-based materials for electrochemical energy conversion reactions

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Carbon Energy 2019年第1期1卷 85-108页

作者： Seokhoon Choi Changyeon kim jun min Suh Ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoulRepublic of Korea

There have been ever-growing demands to develop advanced electrocatalysts for renewable energy conversion over the past *** a promising platform for advanced electrocatalysts,reduced graphene oxide(rGO)has attracted substantial research interests in a variety of electrochemical energy conversion *** versatile utility is mainly attributed to unique physical and chemical properties,such as high specific surface area,tunable electronic structure,and the feasibility of structural modification and ***,a comprehensive discussion is provided upon recent advances in the material preparation,characterization,and the catalytic activity of rGO-based electrocatalysts for various electrochemical energy conversion reactions(water splitting,CO2 reduction reaction,N2 reduction reaction,and O2 reduction reaction).Major advantages of rGO and the related challenges for enhancing their catalytic performance are addressed.

关键词： CO2 reduction reaction electrocatalysis N2 reduction reaction O2 reduction reaction reduced graphene oxide water splitting

Comparison of wrist motion classification methods using surface electromyogram

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Journal of Central South University 2013年第4期20卷 960-968页

作者： JEONG Eui-chul kim Seo-jun SONG Young-rok LEE Sang-min Department of Electronic Engineering Inha University

The Gaussian mixture model (GMM), k-nearest neighbor (k-NN), quadratic discriminant analysis (QDA), and linear discriminant analysis (LDA) were compared to classify wrist motions using surface electromyogram (EMG). Effect of feature selection in EMG signal processing was also verified by comparing classification accuracy of each feature, and the enhancement of classification accuracy by normalization was confirmed. EMG signals were acquired from two electrodes placed on the forearm of twenty eight healthy subjects and used for recognition of wrist motion. Features were extracted from the obtained EMG signals in the time domain and were applied to classification methods. The difference absolute mean value (DAMV), difference absolute standard deviation value (DASDV), mean absolute value (MAV), root mean square (RMS) were used for composing 16 double features which were combined of two channels. In the classification methods, the highest accuracy of classification showed in the GMM. The most effective combination of classification method and double feature was (MAV, DAMV) of GMM and its classification accuracy was 96.85%. The results of normalization were better than those of non-normalization in GMM, k-NN, and LDA.

关键词： Gaussian mixture model k-nearest neighbor quadratic discriminant analysis linear discriminant analysis electromyogram (EMG) pattern classification feature extraction

维普期刊数据库

Multiple cranial nerve palsies with small angle exotropia following COVID-19 mRNA vaccination in an adolescent:A case report

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World Journal of Clinical Cases 2022年第33期10卷 12289-12294页

作者： Heejin Lee jun Chul Byun Won Jae kim min Cheol Chang Saeyoon kim Department of Pediatrics Yeungnam University Medical CenterDaegu 42415South Korea Department of Pediatrics Dongsan HospitalKeimyung University School of MedicineDaegu 42601South Korea Department of Ophthalmology Yeungnam University Medical CenterYeungnam University College of MedicineDaegu 42415South Korea Department of Physical Medicine and Rehabilitation Yeungnam University Medical CenterYeungnam University College of MedicineDaegu 42415South Korea Department of Pediatrics Yeungnam University Medical CenterYeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Several vaccines against the severe acute respiratory syndrome coronavirus 2 have been approved and widely distributed,raising public concerns regarding the side effects of immunization,as the incidence of *** many adverse events following the coronavirus disease 2019(COVID-19)vaccine have been reported,neurological complications are relatively ***,we report a rare case of multiple cranial palsies following COVID-19 vaccination in an adolescent *** SUMMARY A previously healthy,14-year-old Asian girl with facial palsy presented to the emergency department with inability to close the right eye or wrinkle right side of the forehead,and pain in the right *** had received second dose of the COVID-19 mRNA vaccine(Pfizer-BioNTech)18 days before onset of *** was diagnosed with Bell’s palsy and prescribed a steroid(1 mg/kg/day methylprednisolone)based on symptoms and magnetic resonance imaging ***,the next day,all sense of taste was lost with inability to swallow solid food;the gag reflex was *** diplopia was also *** to worsening of her condition,she was given high-dose steroids(1g/day methylprednisolone)for 3 days and then discharged with oral *** in the symptoms was noted 4 days post steroid treatment *** the most recent follow-up,her general condition was good with no symptoms except diplopia;ocular motility disturbances were ***,prism glasses were prescribed for diplopia *** Small-angle exotropia was observed in the facial,trigeminal,and glossopharyngeal nerve palsies,in our *** etiology of this adverse effect following vaccination was thought to be immunological.

关键词： SARS-CoV-2 COVID-19 COVID-19 vaccine Multiple cranial nerve palsies Facial nerve palsy Diplopia Exotropia Case report

Design of a Low-Power 20Gb/s 1:4 Demultiplexer in 0.18μm CMOS

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Chinese Journal of Electronics 2015年第1期24卷 71-75页

作者： PAN min FENG jun Institute of RF & OE-ICs Southeast University School of Computer and Information Hefei University of Technology

A low-power multi-phase clock 20Gb/s1:4 Demultiplexer(DEMUX) without inductors is designed in 0.18μm Complementary metal oxide semiconductor(CMOS) process. The 1:4 DEMUX includes two 1:2DEMUX cells, one 1/2 frequency divider cell, some data and clock buffers. A dynamic CMOS logic latch is used in the 1:2 DEMUX cell and a single clock dynamic-loading latch is used in the 1/2 frequency divider cell. These two kinds of logical structures not only reduce power dissipation and area, but also have an output rail-to-rail level. The rail-to-rail level can offer high noise margin and implement seamless connection without logic level conversion in system integration. The test results show that when the data rate of the input pseudorandom is 20Gb/s and the sequence length is 231-1, this 1:4 DEMUX can work well at a supply voltage of 2V. The output swing is 450 m V with external 50 Ohm load and the die size is 0.475×0.475mm2. The chip power dissipation is 86 m W, when four pads connect with a four-channel oscillograph.

关键词： Demultiplexer Low power Dynamic CMOS logic latch Single clock dynamic-loading latch.

Band gaps of elastic waves in 1-D phononic crystals with imperfect interfaces

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International Journal of minerals,Metallurgy and Materials 2009年第5期16卷 608-614页

作者： min Zheng Pei-jun Wei School of Applied Science University of Science and Technology Beijing Beijing 100083 China

Band gaps of elastic waves in 1-D phononic crystals with imperfect interfaces were studied. By using the transfer matrix method （TMM） and the Bloch wave theory in the periodic structure, the dispersion equation was derived for the periodically lami- nated binary system with imperfect interfaces （the traction vector jumps or the displacement vector jumps）. The dispersion equation was solved numerically and wave band gaps were obtained in the Brillouin zone. Band gaps in the case of imperfect interfaces were compared with that in the case of perfect interfaces. The influence of imperfect interfaces on wave band gaps and some interesting phenomena were discussed.

关键词： phononic crystal transfer matrix band gap imperfect interface Bloch wave

维普期刊数据库

Periodic Wave Solutions to a (3+1)-Dimensional Soliton Equation

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Chinese Physics Letters 2012年第2期29卷 9-12页

作者： WANG jun-min Department of Mathematics and Information Henan University of Economics and LawZhengzhou 450002

Two classes of periodic wave solutions to the (3+1)-dimensional soliton equation are derived by employing the Hirota bilinear method and theta function *** solutions are expressed in terms of Riemann theta functions of genus one and can be converted into an elliptic function format,both their long wave limit and extremum value are discussed in detail.

关键词： theta wave soliton

Epstein-Barr virus-associated lymphoepithelioma-like early gastric carcinomas and endoscopic submucosal dissection: Case series

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World Journal of Gastroenterology 2014年第5期20卷 1365-1370页

作者： Ji Young Lee Kyoung-Mee kim Byung-Hoon min jun Haeng Lee Poong-Lyul Rhee Jae jun kim Department of Medicine Samsung Medical Center Sungkyunkwan University School of Medicine Department of Pathology Samsung Medical Center Sungkyunkwan University School of Medicine

Epstein-Barr virus (EBV)-associated lymphoepithelioma-like gastric carcinoma (LELC) is characterized by a lower lymph node (LN) metastasis rate and a higher survival rate than other forms of gastric cancer. Although current prognosis for LELC is favorable, the most common approach is radical gastrectomy involving an extensive D2 lymph node dissection. Here, we report four cases of EBV-associated early LELC that were treated by an alternative approach, endoscopic submucosal dissection (ESD). The long-term outcome of this procedure is discussed. All patients were treated by ESD en bloc, and all ESD specimens showed tumor-free lateral resection margins. None of the lesions showed lymphovascular invasion. A pathological examination of ESD specimens revealed submucosal invasion of more than 500 μm in all four cases. One patient underwent additional radical surgery post-ESD; no residual tumor or LN metastasis was noted in the surgical specimen. The other three patients did not undergo additional surgery, either because of severe comorbidity or their refusal to undergo operation, but were subjected to medical follow-up. None of the ESD-treated patients reported local recurrence or distant metastases during the 27-32 mo of follow-up after ESD.

关键词： Endoscopic submucosal dissection Epstein-Barr virus Lymph node Lymphoepithelioma-like gastric carcinoma Prognosis

Review of MXenes as new nanomaterials for energy storage/delivery and selected environmental applications

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Nano Research 2019年第3期12卷 471-487页

作者： Byung-Moon jun Sewoon kim Jiyong Heo Chang min Park Namguk Her min Jang Yi Huang Jonghun Han Yeomin Yoon Department of Civil and Environmental Engineering University of South Carolina Columbia 300 Main Street SC 29208 USA Department of Civil and Environmerttal Engineering Korea Army Academy at Young-Cheon 495 Hogook-ro Kokyungmeon Young-Cheon Gyeongbuk 38900 Republic of Korea Department of Environmental Engineering Kyungpook National University 80 Daehak-ro Buk-gu Daegu 41566 Republic of Korea Department of Environmental Engineering Kwangwoon University 447-1 Wolgye-Dong Nowon-Gu Seoul 01897 Republic of Korea School of Engineering Institute for Materials & Processes (IMP) The University of Edinburgh Colin Maclaurin Road Edinburgh EH9 3DW Scotland UK

Energy and environmental issues presently attract a great deal of scientific attention. Recently, two-dimensional MXenes and MXene-based nanomaterials have attracted increasing interest because of their unique properties (e.g., remarkable safety, a very large interlayer spacing, environmental flexibility, a large surface area, and thermal conductivity). In 2011, multilayered MXenes (Ti3C2Tx, a new family of two-dimensional (2D) materials) produced by etching an A layer from a MAX phase of Ti3AlC2, were first described by researchers at Drexel University. The term “MXene” was coined to distinguish this new family of 2D materials from graphene, and applies to both the original MAX phases and MXenes fabricated from them. We present a comprehensive review of recent studies on energy and environmental applications of MXene and MXene-based nanomaterials, including energy conversion and storage, adsorption, membrane, photocatalysis, and antimicrobial. Future research needs are discussed briefly with current challenges that must be overcome before we completely understand the extraordinary properties of MXene and MXene-based nanomaterials.

关键词： MXenes MXene-based nanomaterials energy storage environment applications