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Reg.lation of sleep by.astrocy.es in the hy.othalamic ventrolateral preoptic nucleus

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Neural Reg.neration Research 2025年第4期20卷 1098-1100页

作者： Jae-Hong.Kim Ruqay.a Afridi Il-Sung.jang Maan g.e Lee Ky.ung.o Suk Brain Korea 21 four KNU Converg.nce Educational Prog.am of Biomedical Sciences for Creative Future Talents School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacolog. School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacolog. School of DentistryKyungpook National UniversityDaeguRepublic of Korea Brain Science&Eng.neering.Institute Kyungpook National UniversityDaeguRepublic of Korea

Astrocy.es are functionally.dy.amic cells that support neurons in multiple way. throug.out an org.nism’s *** astrocy.ic reg.lation of neuronal activity.has been increasing.y.recog.ized in recent *** are now recog.ized as play.ng.a more complex role than mere by.tanders in the central nervous ***,their role in reg.lating.the sleep neurocircuitry.is not well *** this perspective,we hig.lig.t the role of astrocy.es in sleep modulation,with a particular focus on reg.latory.mechanisms related to the ventrolateral preoptic nucleus(VLPO)of the *** briefly.discuss recent literature reporting.the role of VLPO astrocy.es in reg.lating.sleep-associated behaviors.

关键词： sleep ventrolateral astrocy.es

Emissions of Er3+ and y.3+ co-doped SrZrO3 nanocry.tals under near-infrared and near-ultraviolet excitations

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Journal of Advanced Ceramics 2020年第4期9卷 413-423页

作者： Hy.ontae Lim Juy.ong.Lim Soy.ung.jang y.S.Lee Department of Phy.ics Soongsil UniversitySeoul06978Republic of Korea

In this study.the upconversion(UC)emissions of Er3+and y.3+co-doped SrZrO3 nanocry.tals(NCs)were investig.ted in terms of the thermal annealing.temperature and concentration of Er3+ions and compared with the emissions under a near-ultraviolet(near-UV)*** NCs were sy.thesized by.the combustion method,and the as-sy.thesized NCs were post-annealed at hig. *** X-ray.diffraction patterns revealed that the g.ain sizes and cry.tallinity.deg.ees of the samples increased with increasing.annealing.*** photoluminescence spectra of our samples exhibited strong.g.een and very.weak red emissions with the near-UV excitation,orig.nating.from the f-f transitions in the Er3+***,under near-infrared(near-IR)excitation,we identified sizable visible emissions at 525,547,and 660 nm in our NCs,which indicated that the UC process successfully.occurred in our *** UC emissions were maximized in the NCs with an Er3+concentration of 0.02 and thermal annealing.at 1000°*** found that the intensity.ratios of red to g.een emissions increased with increasing.annealing.*** discussed the differences in the emissions between near-UV and near-IR excitations.

关键词： Er3+and y.3+co-doped SrZrO3 upconversion downshifting nanocry.tals combustion method annealing.temperature

Experimental and finite element analy.is for fracture of coating.lay.r of g.lvannealed steel sheet

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Transactions of Nonferrous Metals Society.of China 2011年第A01期21卷 111-116页

作者： S.I.KIM J.U.HER y.C.jang y.LEE Sheet Products and Process Research g.oup POSCO Techology Research Laboratory Department of Mechanical Eng.neering Chung-Ang University

Mechanical properties of g.lvannealed (g.) steel sheet used for automotive exposed panel and predicted failure phenomenon of its coating.lay.r were evaluated using.finite element method. V-bending.test was performed to understand better the fracture of coating.lay.r of g. steel sheet during.plastic deformation. y.eld streng.h of the coating.lay.r was calculated by.using.a relative difference between hardness of coating.lay.r measured from the nano-indentation test and that of substrate. To measure shearing.streng.h at the interface between substrate and coating.lay.r, shearing.test with two specimens attached by.an adhesive was carried out. Using.the mechanical properties measured, a series of finite element analy.es coupled with a failure model was performed. Results reveal that the fracture of coating.lay.r occurs in an irreg.lar manner at the reg.on where compressive deformation is dominant. Meanwhile, a series of vertical cracks perpendicular to material surface are observed at the tensile stressed-reg.on. It is found that 0.26-0.28 of local equivalent plastic strain exists at the coating.and substrate at the beg.nning.of failure. The fracture of coating.lay.r depends on ductility.of the coating.lay.r considerably.as well.

关键词： g.lvannealed steel sheet fracture simulation coating.lay.r finite element analy.is, failure model

Unassisted overall water splitting.with a solar-to-hy.rog.n efficiency.of over 10% by.coupled lead halide perovskite photoelectrodes

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Carbon Energ. 2023年第1期5卷 134-143页

作者： Ry.n Rhee Tae g.Kim g.0} y.jang g.ang.in Bae Jung.H.Lee Sunje Lee Sung.oon Kim Seokwoo Jeon Jong.H.Park Department of Chemical and Biomolecular Eng.neering Yonsei UniversitySeoulRepublic of Korea Department of Materials Science and Eng.neering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea

Hy.rog.n is a promising.future sustainable fuel candidate with boundless *** into photoelectrochemical(PEC)water splitting.based on a lead halide perovskite(LHP)has prog.essed sig.ificantly.with the aim of more efficient solar hy.rog.n ***,we unite a well-known photo-absorbing.LHP with cost-effective water-splitting.cataly.ts,and we introduce two ty.es of monolithic LHP-based PEC devices that act as a photocathode and a photoanode for the hy.rog.n evolution reaction and oxy.en evolution reaction,leading.to efficient unbiased overall water *** the integ.ation of these two monolithic LHP-based photoelectrodes,an unbiased solar-to-hy.rog.n conversion efficiency.of 10.64%and a photocurrent density.of 8.65 mA cm^(−2) are achieved.

关键词： perovskite photoelectrochemical cell photoelectrode unassisted

Optimal Operation of Turbo Blowers Serially.Connected Using.Inlet Vanes

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Journal of Thermal Science 2011年第1期20卷 26-31页

作者： Choon-Man jang Plant Research Division Korea Institute of Construction Technology1190 IIsanseo-GuGoyang-Si411-712Korea

Optimal operation of the turbo blowers having.an inlet vane has been studied to understand the blowers' operating.*** analy.e three-dimensional flow field in the turbo blowers serially.connected,g.neral analy.is code,CFX,is introduced in the present *** turbulence model is employ.d to estimate the eddy.*** the numerical analy.is,it is found that the flow rates of the turbo blowers can be controlled at the vane ang.e between 90 (full open condition) deg.ees and 60 deg.ees effectively.because pressure loss rapidly.increases below 60 deg.ee of a vane *** also has almost the same values from 90 deg.ees to 60 deg.ees of a vane *** is noted that the distorted inlet velocity.g.nerated in the small vane ang.e makes performance deterioration of the turbo blowers due to the local leading.edg. separation and the following.non-uniform blade loading.

关键词： Turbo Blower Inlet Vane Refuse Collection Sy.tem Efficiency Numerical Simulation

Iridium oxide fabrication and application: A review

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Journal of Energ.0}Chemistry 2020年第7期29卷 152-172,I0005页

作者： Hansaem jang Jaey.ung.Lee Electrochemical Reaction&Technolog.0}Laboratory.ERTL) School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Ertl Center for Electrochemistry.and Cataly.is GRIGISTGwangju 61005Republic of Korea

Despite the scarcity.and cost of iridium oxide,it is still the material of choice in numerous fields of science and applications,including.capacitors,electrochromism,sensors,and various oxidation electrocataly.is(e.g.,chlorine evolution reaction,detoxification,and oxy.en evolution reaction).Such versatility.is attributed to the distinct features of iridium oxides,such as their activity.biocompatibility.conductivity.and *** features and properties of iridium oxides are strong.y.dependent on the fabrication *** this review,methodolog.es relating.to the sy.thesis and fabrication of solid-state iridium oxides have been thoroug.ly.collected and *** and cry.tallization techniques for iridium oxides are also *** the end of the review,the effects of utilizing.a certain fabrication method on the characteristics of the iridium oxide product are recapitulated,tog.ther with the recommended application of the product in various fields.

关键词： Iridium oxide Iridium dioxide Electrode Electrocataly.t Electrochromism pH sensor Oxy.en evolution reaction

Schottky.barrier modulation of bottom contact SnO_(2) thin-film transistors via chloride-based combustion sy.thesis

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Journal of Materials Science & Technolog. 2023年第17期148卷 199-208页

作者： Bong.o jang Junhee Lee Hong.i Kang.Jaewon jang Hy.k-Jun Kwon Department of Electrical Eng.neering.and Computer Science DGISTDaegu 42988South Korea School of Electronic and Electrical Eng.neering Kyungpook National UniversityDaegu 41566South Korea School of Electronics Eng.neering Kyungpook National UniversityDaegu 41566South Korea Converg.nce Research Advanced Centre for Olfaction DGISTDaegu 42988South Korea

The enhanced carrier flow at the interface between Au and SnO_(2)semiconductors,which initially.form Schottky.contacts,is realized using.chloride-based combustion ***-based combustion sy.-tems can achieve chlorine(Cl)doping.effects as well as conversion to cry.talline SnO_(2)films at clearly.lower temperatures(∼250℃)than conventional *** to the Cl doping.effect,the hig. carrier concentration can induce thin potential barriers at the metal/semiconductor(MS)junctions,resulting.in carrier injection by.*** a result,compared to conventional SnO_(2)thin-film transistors,the de-vices fabricated by.combustion sy.thesis exhibit sig.ificantly.improved electrical performance with field-effect mobility.of 6.52 cm 2/Vs(∼13 times),subthreshold swing.of 0.74 V/dec,and on/offratio of∼10^(7)below 300℃.Furthermore,because of the enhanced tunneling.carriers induced by.the narrowed barrier width,the Schottky.barriers are sig.ificantly.reduced from 0.83 to 0.29 eV(65%decrease)at 250℃and from 0.42 to 0.17 eV(60%decrease)at 400℃.Therefore,chloride-based combustion sy.thesis can con-tribute to developing.SnO_(2)-based electronics and flexible devices by.achieving.both hig.-quality.oxide films and improved current flow at the MS interface with low-temperature annealing.

关键词： SnO_(2) Combustion Sol-g.l Schottky.contact Thin-film transistors

g.aphene and MXene-based porous structures for multifunctional electromag.etic interference shielding

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Nano Research 2023年第1期16卷 1387-1413页

作者： Xi Shen jang-Ky. Kim Department of Aeronautical and Aviation Eng.neering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China School of Mechanical and Manufacturing.Eng.neering University of New South WalesSydneyNSW 2052Australia The Research Institute for Sports Science and Technolog. The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China

Electrically.conductive porous structures are ideal candidates for lig.tweig.t and absorption-dominant electromag.etic interference(EMI)*** this review,we summarize the recent prog.ess in developing.porous composites and structures from emerg.ng.two-dimensional(2D)g.aphene and MXene nanosheets for EMI shielding.*** properties contributing.to various energ.0}loss mechanisms are probed with a critical discussion on their correlations with EMI shielding.*** approaches to constructing.bulk porous structures,such as 2D porous films,three-dimensional(3D)aerog.ls and foams,and hy.rog.ls,are compared to hig.lig.t important material and processing.parameters required to achieve optimal microstructures.A comprehensive comparison of EMI shielding.performance is also carried out to elucidate the effects of different assembly.techniques and *** multifunctional applications in adaptive EMI shielding.mechanical force attenuation,thermal manag.ment,and wearable devices are introduced,underlining.the importance of unique compositions and microstructures of porous *** process–structure–property.relationships established in this review would offer valuable g.idance and insig.ts into the desig. of lig.tweig.t EMI shielding.materials.

关键词： porous composite g.aphene MXene electrical conductivity electromag.etic interference(EMI)shielding

A Structural Topic Model for Exploring.User Satisfaction with Mobile Pay.ents

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Computers, Materials & Continua 2022年第11期73卷 3815-3826页

作者： jang Hy.n Kim Jisung.jang y.ng.wan Kim Dong.1}n Nan Department of Human-Artificial Intellig.nce Interaction Sungkyunkwan UniversitySeoul03063Korea Department of Interaction Science Sungkyunkwan UniversitySeoul03063Korea Department of Applied Artificial Intellig.nce Sungkyunkwan UniversitySeoul03063Korea NAVER g.een Factory Seongnam13561Korea

This study.explored user satisfaction with mobile pay.ents by.apply.ng.a novel structural topic ***,we collected 17,927 online reviews of a specific mobile pay.ent(i.e.,Pay.al).Then,we employ.d a structural topic model to investig.te the relationship between the attributes extracted from online reviews and user satisfaction with mobile ***,we discovered that“lack of reliability.and“poor customer service”tend to appear in neg.tive ***,the terms“convenience,”“user-friendly.interface,”“simple process,”and“secure sy.tem”tend to appear in positive *** the basis of information sy.tem success theory.we categ.rized the topics“convenience,”“user-friendly.interface,”and“simple process,”as sy.tem *** addition,“poor customer service”was categ.rized as service ***,based on the previous studies of trust and security.“lack of reliability.and“secure sy.tem”were categ.rized as trust and security.*** outcomes indicate that users are satisfied when they.perceive that sy.tem quality.and security.of specific mobile pay.ents are *** the contrary.users are dissatisfied when they.feel that service quality.and reliability.of specific mobile pay.ents is ***,our research implies that a novel structural topic model is an effective method to explore mobile pay.ent user experience.

关键词： Mobile pay.ent user satisfaction online review structural topic model