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Corrosion and optimum corrosion protection potential of friction stir welded 5083-O Al alloy for leisure ship

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中国有色金属学会会刊：英文版 2009年第4期19卷 898-903页

作者： Sung-Hyeon PARK jong-shin KIM min-Su HAN Seong-jong KIM Division of Maritime Transportation System Mokpo Maritime University Korea Register of Shipping Division of Marine Engineering Mokpo Maritime University

Electrochemical tests were undertaken to determine the optimum conditions in seawater for corrosion protection of friction stir-welded 5083-O Al *** trend observations show that the limiting potential that avoids the effects of hydrogen embrittlement is -1.6 V,corresponding to the crossover point between concentration polarization and activation ***,the optimum protection potential is between -1.5 and -0.7 V since the current density at these values is low in the potentiostatic *** a galvanic cell is formed in the seawater,the welds exhibit electrochemically stable *** parts in galvanic tests with various area ratios are stable and have excellent anticorrosion characteristics.

关键词：搅拌摩擦焊接保护电位海水腐蚀铝合金氧铝船舶休闲防腐

Relationship between intraocular pressure and parameters of obesity in ocular hypertension

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International Journal of Ophthalmology(English edition) 2020年第5期13卷 794-800页

作者： min Won Ahn Ji Woong Lee jong Hoon shin jong Soo Lee Busan Sungmo Eye Hospital Busan 48064Korea Department of Ophthalmology Pusan National University College of Medicine and Medical Research Institute of Pusan National University HospitalBusan 49241Korea Department of Ophthalmology Pusan National University Yangsan HospitalYangsan 50612Korea

AIM:To evaluate the correlation between intraocular pressure(IOP)and various obesity-related health factors in patients with ocular hypertension in ***:A total of 40850 subjects underwent age,sex,body weight,and height assessments and automated multiphasic tests,including non-contact tonometry,automated perimetry,fundus photography,systolic/diastolic blood pressure measurement,and evaluation of obesity-related health parameters such as obesity index,body mass index(BMI),a body shape index(ABSI),and waist-to-height ratio(WtHR).Subjects were divided into ocular hypertension group and normal IOP group according to IOP after matching of age and ***:Of 40850 participants,1515(3.7%)had ocular hypertension,and 1515 with normal IOP were selected as controls using propensity score *** mean IOP of control group was 15.3±2.3 mm Hg,compared with 23.3±1.6 mm Hg in ocular hypertension ***,obesity index,BMI,and WtHR in the ocular hypertension group were significantly higher than in the normal IOP group(P<0.001,P<0.001,P=0.009,P=0.002).IOP of ocular hypertension was positively correlated with obesity index(P=0.027)and BMI(P=0.016),whereas IOP of control was positively correlated with blood pressure(P<0.001,P=0.002),obesity index(P<0.001),BMI(P<0.001),and WHtR(P=0.002).Systolic blood pressure(β=0.022,P<0.001)and body weight(β=0.016,P=0.02)were precursors of IOP in normal subjects,but sex(male;β=-0.231,P=0.008)and obesity index(β=-0.007,P=0.017)were precursors of ocular hypertension according to multiple regression ***:Among various obesity-related health parameters,obesity index is the best indicator for further increase in IOP in ocular hypertension group.

关键词： intraocular pressure ocular hypertension body mass index body shape index waist-to-height ratio

Driving inward growth of lithium metal in hollow microcapsule hosts by heteroatom‐controlled nucleation

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Carbon Energy 2024年第8期6卷 262-272页

作者： Siwon Kim Hong Rim shin Ki Jae Kim min‐Sik Park jong‐Won Lee Division of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea Department of Advanced Materials Engineering for Information and Electronics Integrated Education for Frontier Science and Technology(BK21 Four)Kyung Hee UniversityYonginRepublic of Korea

The application of Li metal anodes in rechargeable batteries is impeded by safety issues arising from the severe volume changes and formation of dendritic Li ***‐dimensional hollow carbon is receiving increasing attention as a host material capable of accommodating Li metal inside its cavity;however,uncontrollable and nonuniform deposition of Li remains a *** this study,we synthesize metal–organic framework‐derived carbon microcapsules with heteroatom clusters(Zn and Ag)on the capsule walls and it is demonstrated that Ag‐assisted nucleation of Li metal alters the outward‐to‐inward growth in the microcapsule ***‐incorporated microcapsules are prepared via chemical etching of zeolitic imidazole framework‐8 polyhedra and are subsequently decorated with Ag by a galvanic displacement reaction between Ag^(+) and metallic *** introduced Ag significantly reduces the energy barrier and increases the reaction rate for Li nucleation in the microcapsule host upon Li *** combined electrochemical,microstructural,and computational studies,we verify the beneficial role of Ag‐assisted Li nucleation in facilitating inward growth inside the cavity of the microcapsule host and,in turn,enhancing electrochemical *** study provides new insights into the design of reversible host materials for practical Li metal batteries.

关键词： hollow carbon hosts lithium metal batteries lithium plating metal-organic frameworks nucleation

Numerical simulation for thermal response test performance in closed-loop vertical ground heat exchanger

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Science China(Technological Sciences) 2011年第7期54卷 1668-1673页

作者： CHOI jong min LEE Chulho PARK Moonseo KANG shin-Hyung CHOI Hangseok Department of Mechanical Engineering Hanbat National University School of Civil Environmental and Architectural Engineering Korea University Department of Mechanical Engineering Konyang University

In this study, a series of numerical analyses was performed in order to evaluate the performance of full-scale closed-loop vertical ground heat exchangers constructed in Wonju, South Korea. The circulating HDPE pipe, borehole and surrounding ground formation were modeled using FLUENT, a finite-volume method (FVM) program, for analyzing the heat transfer process of the ground heat exchanger system. Two user-defined functions (UDFs) accounting for the difference in the temperature of the circulating inflow and outflow fluid and the variation of ground temperature with depth were adopted in the FLUENT modeling. The thermal conductivities of grouts (cement vs. bentonite) measured in laboratory were used as input values in the numerical analyses to compare the thermal efficiency of the cement and bentonite grouts used for installing the closed-loop vertical ground heat exchanger. A series of numerical analyses was carried out to simulate in-situ thermal response tests performed in the construction site. From the comparison between the in-situ thermal response test results and numerical simulations, the average thermal conductivity of the ground formation in the construction site is back-calculated as approximately 4 W/mK. This value can be used in evaluating the long-term performance of the closed-loop vertical ground heat ex changer.

关键词： closed-loop vertical ground heat exchanger cement grout bentonite grout in-situ thermal response test finite-volumemethod thermal conductivity

Electrical Stimulation of Auricular Acupressure for Dry Eye:A Randomized Controlled-Clinical Trial

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Chinese Journal of Integrative Medicine 2017年第11期23卷 822-828页

作者： jong Soo Lee Sang Ho Hwang Byung Cheul shin Young min Park Department of Ophthalmology School of MedicinePusanNational University and Medical Research InstitutePusan National University HospitalPusan(602-739)Republic of Korea Department of Ophthalmology Jung's Eye CenterPusan(616-849)Republic of Korea Division of Clinical Medicine School of Korean MedicinePusan National UniversityYangsan(626-870)Republic of Korea Department of Ophthalmology Gyeongsang National University School of MedicineGyeongsang National University Changwon HospitalChangwon(51472)Republic of Korea

Objective： To evaluate the clinical efficacy of electrical stimulation（ES） of auricular acupressure on reducing the ocular symptoms and signs before and after treatment for dry eye. Methods： The inclusion criteria were the tear film break-up time（TFBUT） below 5 s and a Schirmer test-Ⅰ below 5 mm in dry eyes with ocular symptoms for at least 6 months. Subjects were randomized into a treatment group（50 cases） with continuous low frequency ES under auricular acupressure at acupoints and a no ES under auricular acupressure（no-ES, control group, 50 cases） on the same acupoints. Auricular acupressure were stimulated with ES at 4 master points of both ears, which were performed twice a week for 4 weeks at each point for 30 s. The ocular symptoms, the TFBUT, and Schirmer test-Ⅰ were evaluated before and after this procedure. Results： There were significantly better scores in TFBUT（P=0.032）, the Schirmer test-Ⅰ（P=0.044） and ocular symptoms（P=0.029） at 3 months post-treatment in the treatment group than in the control group. The total effective rate in the treatment group was accomplished in 41（82%） of the 50 cases of dry eye. Conclusions： Auricular acupressure with ES at auricular acupoint improves ocular symptoms and signs of dry eye for a period of at least 3 months.

关键词： auricular acupressure dry eye syndromes electrical stimulation tears

Existence and Uniqueness of Solutions for two Classes of Functional Equations Arising in Dynamic Programming

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Acta Mathematicae Applicatae Sinica 2007年第2期23卷 195-208页

作者： Ze-qing Liu shin min Kang Department of Mathematics Liaoning Normal University P.O. Box 200 Dalian 116029 China Department of Mathematics and The Research Institute of Natural Science Gyeongsang National UniversityChinju 660-701 Korea

In this paper we establish the existence, uniqueness and iterative approximation of solutions for two classes of functional equations arising in dynamic programming of multistage decision processes. The results presented here extend, and unify the corresponding results due to Bellman, Bhakta and Choudhury, Bhakta and Mitra, Liu and others.

关键词： Functional equation dynamic programming fixed point successive approximation nonexpansive mapping

APPROXIMATION OF COMMON SOLUTIONS OF VARIATIONAL INEQUALITIES VIA STRICT PSEUDOCONTRACTIONS

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Acta Mathematica Scientia 2012年第4期32卷 1607-1618页

作者： Sun Young Cho shin min Kang Department of Mathematics and RINS Gyeongsang National UniversityJinju 660-701 Korea

In this paper, a convex feasibility problem is considered. We construct an iterative method to approximate a common element of the solution set of classical variational inequalities and of the fixed point set of a strict pseudocontraction. Strong convergence theorems for the common element are established in the framework of Hilbert spaces.

关键词： fixed point inverse-strongly monotone mapping nonexpansive mapping variational inequality

Activation or exhaustion of CD8^(+) T cells in patients with COVID-19

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Cellular & Molecular Immunology 2021年第10期18卷 2325-2333页

作者： min-Seok Rha Eui-Cheol shin Laboratory of Immunology and Infectious Diseases Graduate School of Medical Science and EngineeringKorea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Otorhinolaryngology Yonsei University College of MedicineSeoulRepublic of Korea.3 The Center for Epidemic PreparednessKAISTDaejeonRepublic of Korea

In addition to CD4^(+)T cells and neutralizing antibodies,CD8^(+)T cells contribute to protective immune responses against SARS-CoV-2 in patients with coronavirus disease 2019(COVID-19),an ongoing pandemic *** patients with COVID-19,CD8^(+)T cells exhibiting activated phenotypes are commonly observed,although the absolute number of CD8^(+)T cells is *** addition,several studies have reported an upregulation of inhibitory immune checkpoint receptors,such as PD-1,and the expression of exhaustion-associated gene signatures in CD8^(+)T cells from patients with ***,whether CD8^(+)T cells are truly exhausted during COVID-19 has been a controversial *** the present review,we summarize the current understanding of CD8^(+)T-cell exhaustion and describe the available knowledge on the phenotypes and functions of CD8^(+)T cells in the context of activation and *** also summarize recent reports regarding phenotypical and functional analyses of SARS-CoV-2-specific CD8^(+)T cells and discuss long-term SARS-CoV-2-specific CD8^(+)T-cell memory.

关键词： CD8^(+)T cell Activation T-cell exhaustion SARS-CoV-2 COVID-19

Weak and Strong Convergence for Fixed Points of Asymptotically Non-expansive Mappings

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Acta Mathematica Sinica,English Series 2004年第6期20卷 1009-1018页

作者： Ze Qing LIU shin min KANG Department of Mathematics Liaoning Normal University Department of Mathematics and Research Institute of Natural Science Gyeongsang National University

A few weak and strong convergence theorems of the modified three-step iterative sequence with errors and the modified Ishikawa iterative sequence with errors for asymptotically non-expansive mappings in any non-empty closed convex subsets of uniformly convex Banach spaces are established. The results presented in this paper substantially extend the results due to Chang (2001), Osilike and Aniagbosor (2000), Rhoades (1994) and Schu (1991).

关键词： Asymptotically non-expansive mapping Fixed point Modified three-step iterative sequence with errors Modified Ishikawa iterative sequence with errors Uniformly convex Banach space Opial’s condition Weak convergence Strong convergence