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Band dynamics accompanied by bound states in the continuum at the third-orderΓpoint in leaky-mode photonic lattices

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Photonics Research 2021年第6期9卷 1109-1116页

作者： SUN-GOO lee SEONG-HAN KIM CHUL-SIK KEE Integrated Optics Laboratory Advanced Photonics Research InstituteGISTGwangju 61005Republic of Korea

Bound states in the continuum(BICs)and Fano resonances in planar photonic lattices,including metasurfaces and photonic-crystal slabs,have been studied extensively in recent ***,the BICs and Fano resonances are associated with the second stop bands open at the second-order Γ *** paper addresses the fundamental properties of the fourth stop band accompanied by BICs at the third-order Γ point in one-dimensional leakymode photonic *** the fourth stop band,one band edge mode suffers radiation loss,thereby generating a Fano resonance,while the other band edge mode becomes a nonleaky *** fourth stop band is controlled primarily by the Bragg processes associated with the first,second,and fourth Fourier harmonic components of the periodic dielectric constant *** interplay between these three major processes closes the fourth band gap and induces a band flip whereby the leaky and BIC edges transit across the fourth band *** the fourth stop band,an accidental BIC is formed owing to the destructive interplay between the first and second Fourier *** the fourth band gap closes with strongly enhanced radiative Q factors,Dirac cone dispersions can appear at the third-order Γ point.

关键词： lattices continuum harmonics

Potentiostatic corrosion protection technology under cavitation condition for 5083-H116 Al alloy

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Transactions of Nonferrous Metals Society of China 2013年第11期23卷 3206-3214页

作者： Seung-Jun lee Young-Soo PARK Seong-Jong KIM Division of Marine Engineering Mokpo Maritime University Division of Maritime Transportation Science College of Maritime Sciences Korea Maritime and Ocean University

This study aims to characterize the cavitation damage behavior of aluminum alloys in seawater and thus to enhance its cavitation resistance. Potentiostatic experiments were performed under various potential conditions to determine the optimum protection potentials, at which cavitation damage was suppressed. A potential range was selected for the experiment from -2.2 to -1.4 V, which corresponded to the concentration and activation polarization regions on the cathodic polarization curve of the 5083-H116 alloy. After the experiments, the current density-time behavior was investigated, and the degree of surface damage was observed using three-dimensional microscopy and scanning electron microscopy （SEM）, The optimum protection potential was determined to be in the range of-l.9 to -1.5 V under which the cavitation damage was reduced significantly.

关键词： Al alloy cavitation potentiostatic experiment seawater

Switchable diurnal radiative cooling by doped VO_(2)

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Opto-Electronic Advances 2021年第5期4卷 24-30页

作者： Minkyung Kim Dasol lee Younghwan Yang Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea.

This paper presents design and simulation of a switchable radiative cooler that exploits phase transition in vanadium di-oxide to turn on and off in response to *** cooler consists of an emitter and a solar reflector separated by a *** emitter and the reflector play a role of emitting energy in mid-infrared and blocking incoming solar energy in ultraviolet to near-infrared regime,*** of the phase transition of doped vanadium dioxide at room tem-perature,the emitter radiates its thermal energy only when the temperature is above the phase transition *** feasibility of cooling is simulated using real outdoor *** confirme that the switchable cooler can keep a desired temperature,despite change in environmental conditions.

关键词： phase change material photonic crystal passive thermoregulation switchable radiative cooling Fabry-Pérot resonance

Dopant-Tunable Ultrathin Transparent Conductive Oxides for Efficient Energy Conversion Devices

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Nano-Micro Letters 2021年第12期13卷 437-451页

作者： Dae Yun Kang Bo-Hyun Kim Tae Ho lee Jae Won Shim Sungmin Kim Ha-Jun Sung Kee Joo Chang Tae Geun Kim School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea Department of Advanced Materials Engineering Kongju National UniversityCheonan 31080Republic of Korea Department of Physics Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea

Ultrathin film-based transparent conductive oxides(TCOs)with a broad work function(WF)tunability are highly demanded for e cient energy conversion ***,reducing the film thickness below 50 nm is limited due to rapidly increasing resistance;furthermore,introducing dopants into TCOs such as indium tin oxide(ITO)to reduce the resistance decreases the transparency due to a trade-o between the two ***,we demonstrate dopant-tunable ultrathin(≤50 nm)TCOs fabricated via electric field-driven metal implantation(m-TCOs;m=Ni,Ag,and Cu)without com-promising their innate electrical and optical *** m-TCOs exhibit a broad WF variation(0.97 eV),high transmittance in the UV to visible range(89–93%at 365 nm),and low sheet resistance(30–60Ωcm-2).Experimental and theoretical analyses show that interstitial metal atoms mainly a ect the change in the WF without substantial losses in optical *** m-ITOs are employed as anode or cathode electrodes for organic light-emitting diodes(LEDs),inorganic UV LEDs,and organic photovoltaics for their universal use,leading to outstanding performances,even without hole injection layer for OLED through the WF-tailored *** results verify the proposed m-TCOs enable e ective carrier transport and light extraction beyond the limits of traditional TCOs.

关键词： Transparent conductive oxide Metal implantation High transparency Low sheet resistance Work function

Pravastatin activates PPARα/PPARγexpression in the liver and gallbladder epithelium of hamsters

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Hepatobiliary & Pancreatic Diseases International 2011年第2期10卷 185-190页

作者： Seok Ho Dong Jin lee Dong Hee Koh Min Ho Choi Hyun Joo Jang Sea Hyub Kae Division of Gastroenterology Department of Internal MedicineKyung Hee University College of Medicine Division of Gastroenterology Department of Internal MedicineHallym University College of Medicine

BACKGROUND:Our earlier study with cultured gallbladder epithelial cells demonstrated that statins(HMG-CoA reductase inhibitors)activate the expression of PPARαand PPARγ, consequently blocking the production of pro-inflmmatory *** present study used hamsters to investigate the effects of pavastatin on PPARα/PPARγexpression in the liver and gallbladder epithelium,and to determine whether pravastatin suppresses cholesterol crystal formation in the gallbladder. METHODS:A total of 40 Golden Syrian male hamsters(4 weeks old)were randomly assigned to four groups(basal diet control; basal diet+pavastatin;high cholesterol diet;high cholesterol diet+pravastatin).All hamsters were 11 weeks old at the end of the *** liver,gallbladder and bile were harvested. Immunohistochemical staining and Western blotting for PPARαand PPARγwere performed in the liver and gallbladder. A drop of fresh bile was examined for cholesterol crystals under a microscope. RESULTS:In the gallbladder and liver of the hamsters, pravastatin activated the PPARαand PPARγexpression of gallbladder epithelial cells and hepatocytes,and particularly the response of PPARγwas much stronger than that of PPARα. Pravastatin suppressed the formation of cholesterol gallstones or crystals in the gallbladder. CONCLUSION:Pravastatin is an effective medication to activate PPARs(especially PPARγ)in the liver and the gallbladder epithelium of hamsters,and contributes to the prevention of gallstone formation.

关键词： pravastatin PPARα PPARγ hamster gallstone

A novel nanoparticle drug delivery system:tumor-exosome encapsulated DOX for breast cancer treatment and cancer metastasis chemoprevention

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中国药理学与毒理学杂志 2019年第10期 895-896页

作者： ZHOU Yu XIE Xiao-dong NIE Hui-fang JIA lee Cancer Metastasis Alert and Prevention Center and Pharmaceutical Photocatalysis of State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and Chemotherapy Fuzhou University Institute of Oceanography Minjiang University

OBJECTIVE To demonstrate the advantages of tumor exosomes as carriers for "natural nanoparticles" for drug delivery. METHODS The differences in various aspects of exosomes(such as particle size,potential, surface protein, etc.) before and after drug loading(DOX) were compared. Flow cytometry analysis and distribution of exosomes in mice verified the specificity of tumor exosomes for distal tissues, and additionally analyzed the natural targeting of tumor exosomes by confocal experiments and flow cytometry. Tumor exosomes surface protein knockout experiments demonstrate that exosomes indicate that proteins can increase drug delivery efficiency. Animal experiments verify that tumor exosomes loaded with drugs(DOX) inhibit tumor growth and tumor metastasis. RESULTS There were no significant differences in various aspects of exosomes(such as particle size, potential, surface protein, etc.) before and after drug loading(DOX). Confocal and flow analysis showed that the tumor exosomes had good targeting. CD47 knockout experiments demonstrate that tumor exosomes act as drug carriers to reduce the body′ s immune response and enhance drug targeting and delivery efficiency. CONCLUSION Tumor exosomes have great potential and advantages as a targeted drug carrier in the treatment of tumors and prevention of tumor metastasis.

关键词： exosome tumor metastasis drug deliver

Levels and correlates of 24-hour movement behaviors among South Koreans:Results from the Korea National Health and Nutrition Examination Surveys,2014 and 2015

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Journal of Sport and Health Science 2019年第4期8卷 376-385页

作者： Eun-Young,lee Valerie Carson Justin Y.Jeon John C.Spence Mark S.Tremblay School of Kinesiology and Health Studies Queen's UniversityKingston ON K7L 2N9Canada Faculty of Kinesiology Sportand RecreationUniversity of AlbertaEdmonton AB T6G 2H9Canada Department of Sport Industry Faculty of Education SciencesYonsei UniversitySeoul 03722Republic of Korea Healthy Active Living and Obesity(HALO)Research Group CHEO Research InstituteOttawa ON KIH 8L1Canada

*** study aimed to examine the levels and correlates of 24-h movement behaviors(i.e.,physical activity,sedentary time,and sleep),and different patterns of these behaviors in a nationally representative sample of South Koreans aged 12 years and *** study also aimed to examine the sociodemographic correlates of 24?h movement behaviors stratified by age ***-reported,repeated cross-sectional data from 10,708 participants in the 2014 and 2015 Korea National Health and Nutrition Examination surveys were *** variables included moderate-to-vigorous intensity physical activity,muscular strengthening exercises,walking,active transportation,sedentary time,and *** variables included age,sex,household income,area of residence,and education *** statistics by sex and age as well as general linear models by age group were *** proportions of individuals meeting the moderate-to-vigorous intensity physical activity,muscular strengthening exercises,and sleep guidelines were,respectively,21.6%,22.1%,and 32.5%in male youth;6.9%,4.5%,and 22.8%in female youth;55.5%,30.8%,and 54.0%in male adults;48.8%,14.4%,and 57.6%in female adults;44.0%,30.6%,and 45.5%in male older adults;and 29.5%,8.9%,and 37.3%in female older *** proportions of individuals showing the most ideal combinations of 24-h movement behaviors were only 3.2%in youth,0.4%in adults,and 0 in older ***,older age,female sex,or living in metro Seoul were associated with unfavorable patterns of 24-h movement behaviors across different age ***,the associations of income and education with movement behaviors were mixed across age ***,the proportion of South Koreans with a healthy 24-h movement behavior pattern is *** sociodemographic correlates of different types of 24-h movement behaviors should be considered when designing targeted interventions for the promotion of healthy active living for

关键词： 24-h movement behavior Behavioral epidemiology Guideline adherence Health behavior surveillance

Randomized controlled trial of sodium phosphate tablets vs polyethylene glycol solution for colonoscopy bowel cleansing

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World Journal of Gastroenterology 2014年第42期20卷 15845-15851页

作者： Yoon Suk Jung Chang Kyun lee Hyo Jong Kim Chang Soo Eun Dong Soo Han Dong Ⅱ Park Department of Internal Medicine Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Department of Internal Medicine Kyung Hee University School of Medicine Department of Internal Medicine Hanyang University Guri Hospital Hanyang University College of Medicine

AIM: To compare efficacy, patient compliance, acceptability, satisfaction, safety, and adenoma detection rate of sodium phosphate tablets (NaP, CLICOLONTM) to a standard 4 L polyethylene glycol (PEG) solution for bowe... 详细信息

关键词： Sodium phosphate tablets Polyethylene glycol Colonoscopy Bowel preparation

Highly ordered lead-free double perovskite halides by design

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Journal of Materiomics 2020年第4期6卷 651-660页

作者： Chang Won Ahn Jae Hun Jo Jong Chan Kim Hamid Ullah Sangkyun Ryu Younghun Hwang Jin San Choi Jongmin lee Sanghan lee Hyoungjeen Jeen Young-Han Shin Hu Young Jeong Ill Won Kim Tae Heon Kim Department of Physics and Energy Harvest-Storage Research Center(EHSRC) University of UlsanUlsan44610Republic of Korea UNIST Central Research Facilities(UCRF)&School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Multiscale Materials Modelling Laboratory Department of PhysicsUniversity of UlsanUlsan44610Republic of Korea Department of Physics Pusan National UniversityPusan46241Republic of Korea School of Electrical and Electronics Engineering Ulsan CollegeUlsan44610Republic of Korea School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea

Lead-free double perovskite halides are emerging optoelectronic materials that are alternatives to leadbased perovskite ***,single-crystalline double perovskite halides were synthesized,and their intriguing functional properties were *** such pioneering works,lead-free double perovskite halides with better crystallinity are still in demand for applications to novel optoelectronic ***,we realized highly crystalline Cs2AgBiBr6 single crystals with a well-defined atomic ordering on the microscopic *** avoided the formation of Ag vacancies and the subsequent secondary Cs3Bi2Br9 by manipulating the initial chemical environments in hydrothermal *** suppression of Ag vacancies allows us to reduce the trap density in the as-grown crystals and to enhance the carrier mobility *** design strategy is applicable for fabricating other lead-free halide materials with high crystallinity.

关键词： Cs2AgBiBr6 Lead-free Double perovskite Single crystal