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Enhancing BiVO_(4)photoanode performance by insertion of an epitaxial BiFeO_(3)ferroelectric layer

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Journal of Energy Chemistry 2024年第2期89卷 71-78,I0003页

作者： Haejin Jang Yejoon Kim Hojoong choi Jiwoong Yang Yoonsung Jung Sungkyun choi Donghyeon Lee Ho Won Jang Sanghan Lee School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea

BiVO_(4)(BVO)is a promising material as the photoanode for use in photoelectrochemical ***,the high charge recombination and slow charge transfer of the BVO have been obstacles to achieving satisfactory photoelectrochemical *** address this,various modifications have been attempted,including the use of ferroelectric *** materials can form a permanent polarization within the layer,enhancing the separation and transport of photo-excited electron-hole *** this study,we propose a novel approach by depositing an epitaxial BiFeO_(3)(BFO)thin film underneath the BVO thin film(BVO/BFO)to harness the ferroelectric property of *** self-polarization of the inserted BFO thin film simultaneously functions as a buffer layer to enhance charge transport and a hole-blocking layer to reduce charge *** a result,the BVO/BFO photoanodes showed more than 3.5 times higher photocurrent density(0.65 mA cm^(-2))at 1.23 V_(RHE)under the illumination compared to the bare BVO photoanodes(0.18 m A cm^(-2)),which is consistent with the increase of the applied bias photon-to-current conversion efficiencies(ABPE)and the result of electrochemical impedance spectroscopy(EIS)*** results can be attributed to the self-polarization exhibited by the inserted BFO thin film,which promoted the charge separation and transfer efficiency of the BVO photoanodes.

关键词： Photoelectrochemical Photoanode BiVO_(4) Ferroelectric materials BiFeO_(3)

Antidepressant-Like Effects of Hesperidin in Animal Model of Post-Traumatic Stress Disorder

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Chinese Journal of Integrative Medicine 2021年第1期27卷 39-46页

作者： Bombi Lee Gwang Muk choi Bongjun Sur Acupuncture and Meridian Science Research Center College of Korean MedicineKyung Hee UniversitySeoul(02447)Republic of Korea Center for Converging Humanities Kyung Hee UniversitySeoul(02447)Republic of Korea The Graduate School of Basic Science of Medicine College of MedicineKyung Hee UniversitySeoul(02447)Republic of Korea Dopartmont of Molcoular Mcdicine and TIDRC School of MedicineEwha Womans UniversitySeoul(07985)Republic of Korea

Objective:Post-traumatic stress disorder(PTSD)is a psychiatric disorder characterized by depression and anxiety,that arises due to an imbalance of neurotransmitters in response to excessive ***(HSD)is a naturally occurring flavonoid shown to exert a variety of biological activities,including antioxidant,anti-inflammatory,and neuroprotective ***:This study was used the open field test(OFT)and forced swimming test(FST)to examine the effects of HSD on the depression-like response of rats after exposure to a single prolonged stress(SPS)leading to the dysregulation of the serotonergic activation *** rats were given HSD(20,50,and 100 mg/kg,intraperitoneal injection,n=6–7 per group)once daily for 14 days after exposure to *** influence of administration of HSD on SPS-induced behavioral responses and concentrations of serotonin(5-HT),5-hydroxyindoleacetic acid(5-HIAA),and monoamine oxidase-A(MAO-A)in the rat brain were also investigated using enzyme-linked immunoassays(ELISAs).Results:Daily HSD administration significantly improved depression-like behaviors in the FST(P<0.05),increased the number of lines crossed in the central zone of the OFT(P<0.01),and reduced freezing behavior both in contextual and cued fear *** treatment also attenuated the reduction in SPS-induced 5-HT concentrations in the hippocampus and *** increase in 5-HT concentrations during HSD treatment was partially attributed to a decrease in the 5-HIAA/5-HT ratio in the hippocampus of rats with ***,HSD treatment inhibited activity of MAO-A and decreases of tryptophan hydroxylase-1 expression in the ***:HSD was shown to exert antidepressant effects in rats exposed to SPS,suggesting that this natural flavonoid may be an effective medicine for PTSD.

关键词： hesperidin post-traumatic stress disorder depression serotonin

Optical coherence tomography imaging of cranial meninges post brain injury in vivo

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Chinese Optics Letters 2017年第9期15卷 16-19页

作者： Woo June choi Ruikang K.Wang Department of Bioengineering University of WashingtonSeattleWA 98195USA

We report a new application of optical coherence tomography（OCT） to investigate the cranial meninges in an animal model of brain injury in vivo. The injury is induced in a mouse due to skull thinning, in which the repeated and excessive drilling exerts mechanical stress on the mouse brain through the skull, resulting in acute and mild brain injury. Transcranial OCT imaging reveals an interesting virtual space between the cranial meningeal layers post skull thinning, which is gradually closed within hours. The finding suggests a promise of OCT as an effective tool to monitor the mechanical trauma in the small animal model of brain injury.

关键词： Optical coherence tomography imaging of cranial meninges post brain injury in vivo

Change in Childcare Policy and Defamilialization

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学术界 2017年第11期 257-267页

作者： Mihyang choi Sungkyunkwan University

This study explores childcare policy change in South Korea by employing the gradual institutional change model and in relation to the concept of defamilialization.T his study measured the degree of defamilialization quantitatively using the data of Childcare Statistics between 2001-2016 and conducted hierarchical cluster *** analysis results showed that the trajectories of childcare policy in South Korea could be divided into three clusters-2001-2006 for the first cluster,2007-2012 for the second cluster,and2013-2016 for the third cluster-and there were two changes-conversion and *** policy in South Korea has taken the path of familialization,market defamilialization,and active familialization.

关键词： childcare policy policy change defamilialization South Korea

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

Angelica tenuissima Nakai Ameliorates Cognitive Impairment and Promotes Neurogenesis in Mouse Model of Alzheimer's Disease

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Chinese Journal of Integrative Medicine 2018年第5期24卷 378-384页

作者： Minji choi Younghyurk Lee Seung-Hun Cho Department of Psychiatry Hospital of Korean Medicine Kyung Hee University Medical Center

Objective: To research Angelica tenuissima Nakai(ATN) for use in novel Alzheimer’s disease(AD) therapeutics. Methods: The effect of a 30% ethanol extract of ATN(KH032) on AD-like cognitive impairment and neuropathological and neuroinflammatory changes induced by bilateral intracerebroventricular injections of β-amyloid(Aβ) peptide(Aβ1-42) was investigated. Male C57 Bl/6 mice were randomly divided into 4 groups, 10 in each group. KH032-treated groups were administrated with a low or high dose of KH032(50 and 200 mg/kg, respectively), intragastrically for 16 days; distilled water was applied in the sham and negative groups. Open field test, Y maze and Morris water maze test were used for behavior test and cognitive ability. In addition, the neuroprotective effects of KH032 in Aβ1-42-infused mice on the histopathological markers [neuronspecific nuclear protein(Neu N), Aβ1-42] of neurodegeneration were examined. The levels of glial fibrillary acidic protein(GFAP), Neu N, phosphorylation extracellular signal-regulated kinase(ERK)/ERK, brain-derived neurotrophic factor(BDNF), phosphorylation c AMP response element-binding(CREB)/CREB protein expression were measured by Western blot. Results: KH032 treatment ameliorated cognitive impairments, reduced the overexpression of Aβ1-42, and inhibited neuronal loss and neuroinflammatory response in the Aβ1-42-infused mice. Moreover, KH032 treatment enhanced BDNF expression levels in the hippocampus. Finally, KH032 treatment increased phosphorylation of ERK1/2 and CREB, vital for ERK-CREB signaling. Conclusions: KH032 attenuated cognitive deficits in the Aβ1-42-infused mice by increasing BDNF expression and ERK1/2 and CREB phosphorylation and inhibiting neuronal loss and neuroinflammatory response, suggesting that KH032 has therapeutic potential in neurodegenerative disorders such as AD.

关键词： Alzheimer's disease Angelica tenuissima Nakai beta amyloid cognitive impairment neurogenesis

Adsorption of phosphate on magnetite-enriched particles (MEP) separated from the mill scale

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 81-92页

作者： Muhammad Kashif Shahid Yunjung Kim Young-Gyun choi Department of Environmental Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Mechanical Process Research Group Engineering CenterPOSCO E&CIncheon 220099Republic of Korea

Phosphate is a major pollutant in water, causing serious environmental and health consequences. In present study, the phosphate adsorption on novel magnetite-enriched particles (MEP) was comprehensively investigated. A new method and device were introduced for the separation of MEP from the mill scale at low magnetic intensity. Particles were characterized with different techniques such as XRD, XRF, SEM and EDS. The XRD and XRF analysis of MEP identified the dominant existence of crystalline magnetite. Furthermore, the morphological analysis of MEP confirmed the agglomerate porous morphology of magnetite. Oxygen and iron, the main constituents of magnetite were acknowledged during the elemental analysis using EDS. The phosphate adsorption on MEP is well explained using various isotherm and kinetic models, exhibiting the monolayer adsorption of phosphate on the surface of MEP. The maximum adsorption capacity was determined 6.41 mg/g. Based on particle size (45–75 and 75–150 μm) and empty bed contact time (1 and 2 h), four columns were operated for 54 days. MEP were appeared successful to remove all phosphate concentration from the column influent having 2 mg/L concentration. The operated column reactors were successfully regenerated with alkaline solution. The results indicated potential for practical application of the MEP for phosphate removal.

关键词： Adsorption Magnetite Mill-scale Phosphate Wastewater treatment

Massive retroperitoneal hematoma as an acute complication of retrograde intrarenal surgery:A case report

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World Journal of Clinical Cases 2021年第16期9卷 3914-3918页

作者： Taesoo choi Jeonghyouk choi Gyeong Eun Min Dong-Gi Lee Department of Urology School of MedicineKyung Hee UniversitySeoul 05278South Korea

BACKGROUND Retrograde intrarenal surgery(RIRS)has been proven to be a safe and effective treatment modality in large-scale quantitative ***,although its safety profile has been established,it also has a potential risk of life-threatening *** here describe our experience with a patient who developed a huge periureteral hematoma after RIRS with holmium laser *** SUMMARY A 73-year-old woman visited our center with a complaint of gross *** enhanced computed tomography(CT)scan revealed a 1.5-cm left renal pelvis stone with *** patient underwent *** the surgery,a 12/14-Fr ureteral access sheath was applied and a 6-Fr ureteral catheter was indwelled *** postoperative day 1,she experienced aggravated left flank pain and left lower-quadrant tenderness without rebound tenderness.A follow-up CT scan was taken,which revealed a huge hematoma in the periureteral space,not in the perirenal space,with suspicious contrast medium *** angiography was performed;however,it showed no evidence of active *** was conservatively managed with hydration and antibiotic and nonsteroidal anti-inflammatory drug therapy,and was discharged on postoperative day ***,she visited our outpatient department with recurrent left flank pain at 5 d from *** confirmed that the double J-stent was *** rule out stent malfunction,the stent was *** size of the hematoma was observed in the imaging studies,and conservative management for candiduria was performed for 1 *** Although RIRS is an effective and safe procedure for the management of renal stones,clinicians should be aware of its potential complications.

关键词： Retroperitoneal hematoma Ureteral access sheath Retrograde intrarenal surgery Acute complication Case report

Meso-porous silicon-coated carbon nanotube as an anode for lithium-ion battery

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Nano Research 2016年第7期9卷 2174-2181页

作者： Won-Sik Kim Jonghyun choi Seong-Hyeon Hong Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National University Seoul 151-744 Republic of Korea

Meso-porous Si-coated carbon nanotube （CNT） composite powders were prepared by combining a sol-gel method and the magnesiothermic reduction process. Meso-porous Si-coated CNT electrodes exhibit excellent cycle and rate performances as anodes in Li-ion batteries （LIBs）, which can be attributed to the efficient accommodation of volume change from meso-porous Si structure and the enhanced electrical conductivity from CNT core. This simple synthesis and subsequent reduction process provide a scalable route for the large-scale production of Si-C composite nanostructures, which can be utilized in a variety of applications, such as in photocatalysis, photoelectrochemical cells （PECs）, and LIBs.

关键词： meso-porous carbon nanotube (CNT) magnesiothermic reduction battery