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Sulfur-doped hard carbon hybrid anodes with dual lithium-ion/metal storage bifunctionality for high-energy-density lithium-ion batteries

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Carbon Energy 2023年第1期5卷 71-81页

作者： Sungmin cho Jong Chan hyun Son Ha Yeonhua choi Honggyu Seong Jaewon choi Hyoung-Joon Jin Young Soo Yun Program in Environmental and Polymer Engineering Inha UniversityIncheonSouth Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSouth Korea Departmant of Chemistry and Research Institute of Natural Science Gyeongsang National UniversityJinjuSouth Korea Department of Polymer Science and Engineering Inha UniversityIncheonSouth Korea Division of Energy Engineering Kangwon National UniversityGangwon-doSouth Korea

Bifunctional hybrid anodes(BHAs),which are both a high-performance active host material for lithium-ion storage as well as a guiding agent for homogeneous lithium metal nucleation and growth,exhibit significant potential as anodes for next-generation high-energy-density lithium-ion batteries(LIBs).In this study,sulfur-doped hard carbon nanosphere assemblies(S-HCNAs)were prepared through a hydrothermal treatment of a liquid organic precursor,followed by high-temperature thermal annealing with elemental sulfur for application as BHAs for *** a carbonate-based electrolyte containing fluoroethylene carbonate additive,the S-HCNAs showed high lithium-ion storage capacities in sloping as well as plateau voltage sections,good rate capabilities,and stable *** addition,high average Coulombic efficiencies(CEs)of~96.9%were achieved for dual lithium-ion and lithium metal storage *** the LIB full-cell tests with typical NCM811 cathodes,the S-HCNA-based BHAs containing~400 mA h g^(−1) of excess lithium led to high energy and power densities of~500Wh kg^(−1) and~1695Wkg^(−1),respectively,and a stable cycling performance with~100%CEs was achieved.

关键词： hard carbon hybrid anode lithium-ion batteries lithium metal anode lithium metal batteries sulfur-doped carbon

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Fast Tunable Wavelength Sources Based on the Laser Diode Array

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光学学报 2003年第S1期23卷 483-484页

作者： Sung-Chan cho hyun Ha Hong Byoung-Whi Kim WPON team ETRI Daejeon 305-350 KoreaWPON team ETRI Daejeon 305-350 KoreaWPON team ETRI Daejeon 305-350 Korea

We report a demonstration of a fast wavelength tunable source (TWS) based on the laser diode array coupled to the arrayed waveguide grating (AWG) multiplexer. The switching and optical characteristics of TWS make it a... 详细信息

关键词： AWG as for Fast Tunable Wavelength Sources Based on the Laser Diode Array on than be mode LD MWL of

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Point-defect engineering of nanoporous CuBi_(2)O_(4) photocathode via rapid thermal processing for enhanced photoelectrochemical activity

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Journal of Energy Chemistry 2022年第8期31卷 201-209,I0007页

作者： Li Qu Runfa Tan Arumugam Sivanantham Min Je Kang Yoo Jae Jeong Dong hyun Seo Sungkyu Kim In Sun cho Department of Materials Science&Engineering Ajou UniversitySuwon 16499South Korea Department of Energy Systems Research Ajou UniversitySuwon 16499South Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006South Korea

Engineering point defects such as metal and oxygen vacancies play a crucial role in manipulating the electrical,optical,and catalytic properties of oxide semiconductors for solar water ***,we synthesized nanoporous CuBi_(2)O_(4)(np-CBO)photocathodes and engineered their surface point defects via rapid thermal processing(RTP)in controlled atmospheres(O_(2),N_(2),and vacuum).We found that the O_(2)-RTP treatment of np-CBO increased the charge carrier density effectively without hampering the nanoporous morphology,which was attributed to the formation of copper vacancies(VCu).Further analyses revealed that the amounts of oxygen vacancies(Vo)and Cu^(1+)were reduced simultaneously,and the relative electrochemical active surface area increased after the O_(2)-RTP ***,the point defects(VC_(u),Cu^(1+),and Vo)regulated np-CBO achieved a superb water-splitting photocurrent density of-1.81 m A cm^(-2) under simulated sunlight illumination,which is attributed to the enhanced charge transport and transfer properties resulting from the regulated surface point ***,the reversibility of the formation of the point defects was checked by sequential RTP treatments(O_(2)-N_(2)-O_(2)-N_(2)),demonstrating the strong dependence of photocurrent response on the RTP ***,the surface point defect engineering via RTP treatment in a controlled atmosphere is a rapid and facile strategy to promote charge transport and transfer properties of photoelectrodes for efficient solar water-splitting.

关键词： Nanoporous Copper bismuth oxide Rapid thermal processing Copper vacancy Charge transport

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Oral cyclophosphamide-induced posterior reversible encephalopathy syndrome in a patient with ANCA-associated vasculitis:A case report

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World Journal of Clinical Cases 2021年第21期9卷 6130-6137页

作者： Yire Kim Jihye Kwak Sehyun Jung Seunghye Lee Ha Nee Jang hyun Seop cho Se-Ho Chang hyun-Jung Kim Internal Medicine Gyeongsang National University HospitalJinju 52727South Korea Institute of Health Sciences Gyeongsang National UniversityJinju 52727South Korea Internal Medicine College of MedicineGyeongsang National UniversityJinju 52727South Korea

BACKGROUND Posterior reversible encephalopathy syndrome(PRES)manifests many neurological symptoms with typical features on neuroimaging studies and has various risk *** is one of the therapeutic agents for antineutrophil cytoplasmic antibody(ANCA)-associated *** as the sole cause of PRES has been reported in only a few ***,we report a unique case of early-onset oral cyclophosphamide-induced PRES in a patient with ANCA-associated *** SUMMARY A 73-year-old man was transferred to our hospital for sepsis due to acute *** had already received hemodialysis for two weeks due to septic acute kidney *** azotemia was not improved after sepsis resolved and perinuclear-ANCA was *** biopsy showed crescentic *** hemorrhage was observed on *** was initially treated with intravenous methylprednisolone and plasma exchange for one *** then,two days after adding oral cyclophosphamide,the patient developed generalized tonic-clonic *** diagnosed PRES by Brain magnetic resonance imaging(MRI)and *** were controlled with fosphenytoin 750 *** was suspected to be the cause of PRES and *** mentality was recovered after seven days and brain MRI showed normal state after two *** The present case shows the possibility of PRES induction due to short-term use of oral cyclophosphamide *** should carefully monitor neurologic symptoms after oral cyclophosphamide administration in elderly patients with underlying diseases like sepsis,renal failure and ANCA-associated vasculitis.

关键词： Cyclophosphamide Posterior reversible encephalopathy syndrome Antineutrophil cytoplasmic antibody-associated vasculitis Renal failure Case report

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Changes in spatial variations of sap flow in Korean pine trees due to environmental factors and their effects on estimates of stand transpiration

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Journal of Mountain Science 2016年第6期13卷 1024-1034页

作者： Minkyu MOON Taek-yu KIM Juhan PARK Sungsik cho Daun RYU Sanguk SUH hyun Seok KIM National Center for Agro Meteorology 1 Gwanak-roGwanak-guSeou1151-744Republic of Korea National Institute of Environmental Research 42 Hwangyong-roSeo-guIncheon 404-780Republic of Korea Department of Forest Sciences Seoul National UniversityI Gwanak-roGwanak-guSeou1151-921Republic of Korea National Academy of Agricultural Science 166 Nongsaengmyeong-roWanju-gun 565-851Republic of Korea Research Institute for Agriculture and Life Sciences 1 Gwanak-roGwanak-guSeou1151-921Republic of Korea

It is difficult to scale up measurements of the sap flux density(J_S) for the characterization of tree or stand transpiration(E) due to spatial variations in J_S and their temporal *** assess spatial variations in the sap flux density of Korean pine(Pinus koraiensis) and their effects on E estimates,we measured the J_S using Granier-type *** trees,the J_S decreased exponentially with the radial depth,and the J_S of the east aspects were higher than those of the west *** trees,there was a positive relationship between J_S and the tree diameter at breast height,and this positive relationship became stronger as the transpiration demand *** spatial variations that caused large errors in E estimates(i.e.,up to 110.8 % when radial variation was ignored) had varied systematically with environmental factors systematic characteristics in relation to environmental ***,changes in these variations did not generate substantial errors in the E *** our study periods,the differences in the daily E(E_D) calculated by ignoring radial,azimuthal and tree-to-tree variations and the measured E_D were fairly constant,especially when the daily vapor pressure deficit(D_D)was higher than 0.6 k *** results imply that the effect of spatial variations changes on sap flow can be a minor source of error compared with spatial variations(radial,azimuthal and tree-to-tree variations) when considering E estimates.

关键词： Sap flow Environmental factors Pinuskoraiensis Scale-up Stand transpiration

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Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials Science & Technology 2022年第12期107卷 252-258页

作者： Seungchan cho Junghwan Kim Ilguk Jo Jae hyun Park Jaekwang Lee hyun-Uk Hong Bong Ho Lee Wook Ryol Hwang Dong-Woo Suh Sang-Kwan Lee Sang-Bok Lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

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The Sensing Behavior to Volatile Organic Compounds Gas on Polypyrrole Sensor under Humidity Condition

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稀有金属材料与工程 2006年第A3期35卷 65-66页

作者： Jae-hyun cho Joon-Boo Yu Sung-Ok Sohn Duk-Dong Lee Jeung-Soo Huh Department of Material Science Metallurgy Kyungpook National UniversitySangyuk-Dong 1370DaeguKorea School of Electronic Engineering Kyungpook National UniversitySangyuk-Dong 1370DaeguKorea

Polypyrrole (PPy) powder was synthesized by chemical polymerization at 0℃under atmospheric condition and its layer was prepared by dip coating method on the alumina substrate with interdigitated *** influence of relative humidity (RH 0～70%) to PPy sensor was *** measuring temperature was fixed at 25℃.Methanol and benzene were used as target *** analytic techniques were examined to observe changes in the properties of PPy *** sensitivity of PPy sensor to water vapor was linearly increased with the increasing *** the relative humidity increase from 0% to 70%,the sensitivities to methanol and benzene vapor were reduced,and reduction ratio of sensitivity was 94%, 92.5% at RH 70%,respectively.

关键词： VOCs polypyrrole humidity effect gas sensor

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Intrahepatic biliary cystadenoma:Is there really an almost exclusively female predominance?

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World Journal of Gastroenterology 2011年第25期17卷 3073-3074页

作者： Ho hyun Kim Young Hoe Hur Yang Seok Koh chol Kyoon cho Jin Woong Kim Department of Surgery Chonnam National University Medical School Department of Radiology Chonnam National University Medical School

Biliary cystic tumors,such as cystadenomas and cystadenocarcinomas,are rare cystic tumors of the liver,accounting for less than 5% of all intrahepatic cysts of biliary *** cystadenomas have been known to occur predominantly in women (> 85%),and 38%-44% of biliary cystadenocarcinomas have occurred in *** wrote this letter to comment on a brief article (World J Gasteroenterol 2011 January 21;17(3):361-365) regarding a case of intrahepatic biliary cystic neoplasm treated with *** adenoma-carcinoma sequence is the possible mechanism of *** the carcinogenesis of biliary cystadenocarcinoma occurs in the adenoma-carcinoma sequence,we believe that the male-to-female ratio of cystadenoma should be higher than the incidence rate that has been reported to date.

关键词： Biliary cystadenoma Cystadenocarcinoma Carcinogenesis Incidence

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Small sphincterotomy combined with endoscopic papillary large balloon dilation versus sphincterotomy

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World Journal of Gastroenterology 2009年第34期15卷 4298-4304页

作者： hyun Gun Kim Young Koog Cheon Young Deok cho Jong Ho Moon Do hyun Park Tae Hoon Lee hyun Jong choi Sang-Heum Park Joon Seong Lee Moon Sung Lee Institute for Digestive Research Digestive Disease Center Soonchunhyang University College of Medicine

AIM： To compare small sphincterotomy combined with endoscopic papillary large balloon dilation （SES ＋ ELBD） and endoscopic sphincterotomy （EST） for large bile duct stones. METHODS： We compared prospectively SES ＋ ELBD （group A, n = 27） with conventional EST （group B, n = 28） for the treatment of large bile duct stones （≥ 15 mm）. When the stone could not be removed with a normal basket, mechanical lithotripsy was performed. We compared the rates of complete stone removal with one session and application of mechanical lithotripsy. RESULTS： No significant differences were observed in the mean largest stone size （A： 20.8 mm, B： 21.3 mm）, bile duct diameter （A： 21.4 turn, B： 20.5 ram）, number of stones （A： 2.2, B： 2.3）, or procedure time （A： 18 min, B： 19 rain） between the two groups. The rates of complete stone removal with one session was 85% in group A and 86% in group B （P = 0.473）. Mechanical lithotripsy was required for stone removal in nine of 27 patients （33%） in group A and nine of 28 patients （32%, P = 0.527） in group ***： SES ＋ ELBD did not show significant benefits compared to conventional EST, especially for the removal of large （≥ 15 mm） bile duct stones.

关键词： Sphincterotomy Endoscopic Balloon dilatation cholelithiasis Lithotripsy

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Serial evaluation of myocardial function using the myocardial performance index in Kawasaki disease

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World Journal of Pediatrics 2018年第3期14卷 259-268页

作者： Eun Song Song Somy Yoon Joo hyun cho Eun Mi Yang Hwa Jin cho Young Youn choi Jae Sook Ma Gwang Hyeon Eom Young Kuk cho Department of Pediatrics Chonnam National University HospitalChonnam National University Medical School42 Jebong-roDong-guGwangju 501-757South Korea Department of Pharmacology and Medical Research Center for Gene Regulation Chonnam National University Medical School160 Baekseo-roDong-guGwangju 61469South Korea Department of Pediatrics KS HospitalGwangjuSouth Korea

Background Kawasaki disease (KD) is known as systemic vasculitis, and more than half of the patients with KD have myo-carditis, which can induce ventricular dysfunction. In this study, we evaluate left ventricular (LV) dysfunction in patients with KD based on the myocardial performance index (MPI) using pulse Doppler (PD) and tissue Doppler imaging (TDI), from the acute to convalescent phases. Methods We retrospectively studied 89 children diagnosed with KD from January 2010 to August 2012. We assessed the presence of coronary artery lesions (CALs) and the LV ejection fraction, PD-MPI, and TDI-MPI at diagnosis, and 2, 14, and 56 days after intravenous immunoglobulin (IVIG) treatment. We enrolled 70 healthy children as a control group. Results The ejection fraction in patients with KD at diagnosis (67.3 ± 0.9%) was lower than that in the control group (69.8 ± 0.8%,P = 0.035), and the LV TDI-MPIs for patients with KD at diagnosis (0.49 ± 0.01) and 2 days after IVIG treatment (0.48 ± 0.01) were higher than those in the control group (0.45 ± 0.01,P = 0.002,P = 0.033, respectively). No signifi cant diff erences were found in the LV dysfunction between the patients with complete and incomplete KD. Septal TDI-MPIs in patients with KD with CAL at diagnosis (0.52 ± 0.02) were higher than those in patients with KD without CAL (0.47 ± 0.01,P = 0.019). Conclusions Transient LV dysfunction occurred in patients with complete and incomplete KD in the acute stage. In patients with KD with CAL at diagnosis, the LV dysfunction was more prominent. The PD-MPI and TDI-MPI are useful parameters for assessing LV function in patients with KD.

关键词： Kawasaki disease Myocardial function Myocardial performance index Tissue Doppler imaging

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