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SOME RESULTS ON GENERALIZED EQUILIBRIUM PROBLEMS INVOLVING STRICTLY PSEUDOCONTRACTIVE MAPPINGS

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Acta Mathematica Scientia 2011年第5期31卷 2041-2057页

作者： jong kyu kim Sun Young Cho Department of Mathematics Educations Kyungnam UniversityMasan 631-701Korea Department of Mathematics Gyeongsang National UniversityChinju 660-701Korea

In this paper,we consider an iterative sequence for generalized equilibrium problems and strictly pseudocontractive mappings.We show that the iterative sequence converges strongly to a common element of the solution s... 详细信息

关键词： equilibrium problem nonexpansive mapping inverse-strongly monotone mapping strictly pseudocontractive mapping

Clinical characteristics and prognosis of patients with ulcerative colitis that shows rectal sparing at initial diagnosis

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World Journal of Gastrointestinal Endoscopy 2021年第9期13卷 407-415页

作者： Yong-Sung Choi jong-kyu kim Wan-Jung kim Department of Internal Medicine Daehang HospitalSeoul 06699South Korea Department of Gastroenterology Daehang HospitalSeoul 06699South Korea

BACKGROUND Ulcerative colitis(UC)is characterised by mucosal inflammation from the rectum to its proximal area in a symmetric and continuous fashion.However,although uncommon,we encounter cases of UC with rectal sparing in the initial stage.AIM To evaluate the clinical characteristics and clinical course for rectal sparing UC compared with typical UC.METHODS We looked at records from 2004 to 2015,and selected patients who were newly diagnosed with UC,and who could be followed up for at least 5 years in our hospital.We then retrospectively analysed the medical records and endoscopic findings of those patients.To compare the clinical course and prognosis,we matched each patient with rectal sparing UC 1:3 with controls by age,sex,and disease extent.RESULTS Of 619 UC patients,24(3.9%)showed rectal sparing at diagnosis.During the follow-up period(median 8 years),in two(8.3%)of the 24 patients,rectal sparing remained through follow-up inspections;but for the other 22(91.7%)patients,obvious rectal inflammation was found at follow-up endoscopy.Of the 24 patients,8(33.3%)were initially misdiagnosed with infectious colitis.No diagnosis was changed to Crohn’s disease.The uses of corticosteroid or biologic agents,hospitalisation rate,and colectomy rates were not different between the rectal sparing UC group and typical UC group.CONCLUSION Some patients with UC can reveal atypical patterns of disease distribution,such as rectal sparing in its initial stage;but despite this,the clinical course and prognosis may not differ from those of typical UC patients.

关键词： Ulcerative colitis Rectal sparing Clinical characteristics Prognosis At diagnosis Adult

Overcoming the fundamental light-extraction efficiency limitations of deep ultraviolet light-emitting diodes by utilizing transverse-magnetic-dominant emission

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Light(Science & Applications) 2015年第1期4卷 422-429页

作者： Dong Yeong kim Jun Hyuk Park jong Won Lee Sunyong Hwang Seung Jae Oh Jungsub kim Cheolsoo Sone EFred Schubert jong kyu kim Department of Materials Science and Engineering Pohang University of Science and TechnologyPohang 790-784Korea LED Business Samsung ElectronicsYongin 446-920Korea Future Chips Constellation Department of ElectricalComputerand Systems EngineeringRensselaer Polytechnic InstituteTroyNY 12180USA

While the demand for deep ultraviolet(DUV)light sources is rapidly growing,the efficiency of current AlGaN-based DUV light-emitting diodes(LEDs)remains very low due to their fundamentally limited light-extraction efficiency(LEE),calling for a novel LEE-enhancing approach to deliver a real breakthrough.Here,we propose sidewall emission-enhanced(SEE)DUV LEDs having multiple light-emitting mesa stripes to utilize inherently strong transverse-magnetic polarized light from the AlGaN active region and three-dimensional reflectors between the stripes.The SEE DUV LEDs show much enhanced light output power with a strongly upward-directed emission due to the exposed sidewall of the active region and Al-coated selective-area-grown n-type GaN micro-reflectors.The devices also show reduced operating voltage due to better n-type ohmic contact formed on the regrown n-GaN stripes when compared with conventional LEDs.Accordingly,the proposed approach simultaneously improves optical and electrical properties.In addition,strategies to further enhance the LEE up to the theoretical optimum value and control emission directionality are discussed.

关键词： deep ultraviolet light-emitting diodes light-extraction efficiency

An Iterative Algorithm for Generalized Mixed Equilibrium Problems and Fixed Points of Nonexpansive Semigroups

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Journal of Applied Mathematics and Physics 2017年第2期5卷 276-293页

作者： jong kyu kim Salahud din Won Hee Won Hee Department of Mathemarics Education Kyungnam University Changwon Gyeongnam Korea Department of Mathematics Jazan University Jazan Kingdom of Saudi Arabia

In this works, by using the modified viscosity approximation method associated with Meir-Keeler contractions, we proved the convergence theorem for solving the fixed point problem of a nonexpansive semigroup and gener... 详细信息

关键词： Meir-Keeler Contraction Mappings Left Regular Generalized Mixed Equilibrium Problems Variational Inequalities α-Inverse Strongly Monotone Mappings Nonexpansive Semigroups

ASYMPTOTIC BEHAVIOR OF NON-AUTONOMOUS DISSIPATIVE SYSTEMS IN HILBERT SPACES

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Acta Mathematica Scientia 1998年第S1期18卷 25-30页

作者：李刚 jongkyukim Department of Mathematics Yangzhou University Yangzhou 225002 China Department of Mathematics Kyungnam University Masan 631-701 Korea

This paper dwells upon the asymptotic behavior, as t→∞, of the integral solution u(t) to the nonhaear evolution equation u'(t) ∈A(t)u(f) + g(t),t≥s,u(s) =xo∈D(A(a)),where {A(t)}t≥s is a family m-ipative operator in a Hlilbert space H,and g∈L(loc)(0,∞;H). We prove that converges weakly, as t→∞, uniforluly in h≥0, which applies that u(t) is weak convergence if and only if u(t) is weakly asymptotically regular i.e., u(t + h) -u(f) →0 for h≥0.

关键词： Nonlinear evolution equation dissipative operator integral solution asymptotic behavior

Hyperreflective photonic crystals created by shearing colloidal dispersions at ultrahigh volume fraction

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Microsystems & Nanoengineering 2024年第1期10卷 161-173页

作者： Minji kim jong Bin kim Shin-Hyun kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Colloidal crystallization serves as one of the most economic and scalable production methods for photonic crystals.However,insufficient optical performance,nonuniformity and low reproducibility remain challenges for advanced high-value applications.In this study,we optimally formulate a photocurable dispersion of silica particles and apply shear flow to unify the orientation of the colloidal crystals,ensuring high optical performance and uniformity.The silica particles experience strong repulsion at ultrahigh volume fractions of 50%but demonstrate low mobility,leading to polycrystalline structures.Applying shear flow to the dispersions allows the silica particles to rearrange into larger crystalline domains with a unidirectional orientation along the flow.This shear-induced structural change produces absolute reflectivity at the stopband as high as 90%and a high transparency of 90%at off-resonant wavelengths with minimal diffusive scattering.Furthermore,the strong interparticle repulsion ensures a uniform volume fraction of particles throughout the dispersion,reducing deviations in the optical properties.We intricately micropattern the photocurable dispersions using photolithography.Additionally,the photonic films and patterns can be stacked to form multiple layers,displaying mixed structural colors and multiple reflectance peaks without sacrificing reflectivity.These superior photonic materials hold promise for various optical applications,including optical components and anticounterfeiting patches.

关键词： properties. dispersion reflectivity

Technical issues and new devices of ESD of early gastric cancer

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World Journal of Gastroenterology 2011年第31期17卷 3585-3590页

作者： Wan Sik Lee Jin Woong Cho Young Dae kim kyu jong kim Byung Ik Jang Division of Gastroenterology Department of Internal MedicineChonnam University Medical School Division of Gastroenterology and Hepatology Department of Internal MedicinePresbyterian Medical Center Division of Gastroenterology and Hepatology Department of Internal MedicineSchool of MedicineChosun University Division of Gastroenterology Department of Internal MedicineKosin University College of Medicine Division of Gastroenterology Department of Internal MedicineYeungnam University College of Medicine

Endoscopic submucosal dissection(ESD) is a highly refined technique compared to conventional endoscopic mucosal resection.It enables complete resection of early gastric cancer(EGC) which has no possibility of lymph node metastasis.Indication for ESD of EGC generally entails early gastric cancer confined to the mucosa with well differentiated histology,though there are clinically suitable expanded criteria.As ESD requires specific skill and expertise,endoscopists need to be familiarized with basic methods and the use of special devices.The essence of the technique is to dissect the submucosal layer with direct vision and maintain thecutting plane above the underlying proper muscle layer.Although there are some differences in the detailed technical aspect,the cardinal method of ESD is now well established and standardized.Furthermore,research and development of new ESD devices that render more efficient,safe ESD are still in progress to improve the overall result of ESD on early gastric cancer.

关键词：公共服务电子化新设备胃癌早期技术 ESD 扩展标准

Reconstruction of cervical necrotizing fasciitis defect with the modified keystone flap technique:Two case reports

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World Journal of Clinical Cases 2024年第7期12卷 1305-1312页

作者： Wonseok Cho Eun A Jang kyu Nam kim Department of Plastic and Reconstructive Surgery Kangbuk Samsung HospitalSungkyunkwan University School of MedicineSeoul 03181South Korea

BACKGROUND Cervical necrotizing fasciitis(CNF)is a rare,aggressive form of deep neck space infection with significant morbidity and mortality rates.Serial surgical debridement acts as the cornerstone of CNF treatment;however,it often results in defects requiring complex reconstructions.CASE SUMMARY We report two cases in which the keystone flap(KF)was used for CNF defect coverage:Case 1,an 85-year-old patient with CNF in the anterior neck,and Case 2,a 54-year-old patient with CNF in the posterior neck.Both patients received empirical intravenous antibiotic therapy and underwent serial debridement,enabling adequate wound preparation and stabilization.The final defect size measured 5.5 cm×12 cm in Case 1 and 6 cm×11 cm in Case 2.For defect coverage,we employed an 8 cm×19 cm type II KF based on perforators from the superior thyroid artery in Case 1 and a 9 cm×18 cm type II KF based on perforators from the transverse cervical artery in Case 2.Both flaps showed complete survival.No postoperative complications occurred in both cases,and favorable outcomes were observed at 7-and 6-month follow-ups in case 1 and 2,respectively.CONCLUSION We effectively treated CNF-associated defects using the KF technique;KF is viable for covering CNF defects in carefully selected cases.

关键词： Fasciitis Necrotizing Debridement Plastic surgery Dermatologic surgical procedures Case report

MXene-based hybrid materials for electrochemical and photoelectrochemical H_(2) generation

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Journal of Energy Chemistry 2024年第6期93卷 111-125,I0004页

作者： Jun Young kim Seung Hun Roh Chengkai Xia Uk Sim Jung kyu kim School of Material Science and Engineering North University of ChinaTaiyuan 030051China School of Chemical Engineering Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwon 16419Republic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuJeollanamdo 58330Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwon 16419Republic of Korea

The conversion of solar energy to produce clean hydrogen fuel through water splitting is an emerging strategy for efficiently storing solar energy in the form of solar fuel.This aligns with the increasing global demand for the development of an ideal energy alternative to fossil fuels that does not emit greenhouse gases.Electrochemical(EC) and photoelectrochemical(PEC) water splitting technologies have garnered significant attention worldwide for advanced hydrogen solar fuel production in recent decades.To achieve sustainable green H_(2) production,it is essential to create efficient catalyst materials that are low-cost and can replace expensive noble metal-based catalysts.These characteristics make them an ideal catalyst material for the process.Two-dimensional MXenes with M_(n+1)X_(n) structure have been identified as a promising option for EC and PEC water splitting due to their superior hydrophilicity,metal-like conductivity,large surface area,and adjustable surface chemistry.Here,we present a summary of recent advancements in the synthesis and performance enhancement methods for MXene hybrid materials in hydrogen production through EC and PEC water splitting.Furthermore,we examine the challenges and insights associated with the rational design of MXene-based hybrid materials to facilitate efficient water splitting for sustainable solar fuel production.

关键词： MXene Hybrid materials EC PEC HER OER Water splitting