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Visual quality assessment after presbyopic laser in-situ keratomileusis

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International Journal of Ophthalmology(English edition) 2018年第3期11卷 462-469页

作者： Dong Hui Lim eui-Sang chung Myoung Joon Kim Tae-young chung Department of Ophthalmology Samsung Medical Center Sungkyunkwan University School of Medicine Department of Preventive Medicine Graduate School the Catholic University of Korea Department of Ophthalmology University of Ulsan College of MedicineAsan Medical Center

AIM： To assess visual quality after presbyopia correction using an aspheric ablation profile and a micro-monovision protocol. METHODS： This is a retrospective interventional study. Fifty-four eyes of 27 patients （mean age, 50.2±7.5y） who underwent presbyopia correction with an aspheric micro-monovision protocol were enrolled. The values of modulation transfer function （MTF） cutoff frequency, Strehl ratio, objective scattering index （OSI） and accommodation range were quantitatively assessed using the HD analyzer. Preoperative and postoperative contrast sensitivity （CS） at far （2.5 m） and near （40 cm） distance and higher-order aberrations （HOAs） were analyzed. Subjective visual satisfaction was evaluated by self-reported questionnaire regarding optical visual symptoms. RESULTS： One year after presbyopia correction, no significant differences were found in the MTF cutoff frequency, Strehl ratio and OSI, however, the lID analyzer accommodation range significantly differed postoperatively （P=0.004）. Postoperative CS at 12 and 18 cpd at near showed statistically significant improvement （P=0.020 and 0.008, respectively）. Visual performance by self-reported questionnaire revealed satisfactory results in terms of subjective visual quality improvement. CONCLUSION： Objective optical quality parameters show good visual outcomes. Subjective visual quality assessed by self-reported questionnaire in the presbyopia correction group show satisfactory results.

关键词： presbyopia correction laser blended vision visual quality LASIK

Asymmetric optical camouflage:tuneable reflective colour accompanied by the optical Janus effect

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Light(Science & Applications) 2020年第1期9卷 325-334页

作者： Taehyun Kim eui-Sang Yu young-Gyu Bae Jongsu Lee In Soo Kim Seok chung Seung-Yeol Lee Yong-Sang Ryu Sensor System Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Micro/Nano Systems Korea UniversitySeoul 02841Republic of Korea School of Electronic and Electrical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Nanophotonics Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea

Going beyond an improved colour gamut,an asymmetric colour contrast,which depends on the viewing direction,and its ability to readily deliver information could create opportunities for a wide range of applications,such as nextgeneration optical switches,colour displays,and security features in anti-counterfeiting ***,we propose a simple Fabry–Perot etalon architecture capable of generating viewing-direction-sensitive colour contrasts and encrypting pre-inscribed information upon immersion in particular solvents(optical camouflage).Based on the experimental verification of the theoretical modelling,we have discovered a completely new and exotic optical phenomenon involving a tuneable colour switch for viewing-direction-dependent information delivery,which we define as asymmetric optical camouflage.

关键词： asymmetric generating readily

Landscapes of SARS-CoV-2-reactive CD8^(+)T cells:heterogeneity of host immune responses against SARS-CoV-2

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Signal Transduction and Targeted Therapy 2021年第5期6卷 1399-1401页

作者： June-young Koh eui-Cheol Shin Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea The Center for Epidemic Preparedness KAISTDaejeonRepublic of Korea

In a recent study published in Science Immunology,^Kusnadi et *** single-cell RNA sequencing(scRNA-seq)of SARS-CoV-2-reactive CD8^(+)T cells and reported ***-CoV-2 infection causes COVID-19,which is an ongoing pandemic disease threatening public *** virology of SARS-CoV-2 and immune responses against the virus have been urgently investigated to develop effective measures against *** viral infection,CD84 T cells contribute to elimination of the virus by exerting cytotoxicity against virus-infected cells and producing effector cytokines,whereas neutralizing antibodies interfere with viral entry of host cells.

关键词： al. infection Immunology

Distributional Methods for a Class of Functional Equations and Their Stabilities

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Acta Mathematica Sinica,English Series 2007年第11期23卷 2017-2026页

作者： Jae young chung Department of Mathematics Kunsan National UniversityKunsan 573-701South Korea

We consider a class of n-dimensional Pompeiu equations and that of Pexider equations and their Hyers Ulam stability problems in the spaces of Schwartz distributions. First, reducing the given distribution version of functional equations to differential equations we find their solutions. Secondly, using approximate identities we prove the Hyers Ulam stability of the equations.

关键词： Pompeiu equations Pexider equations distributions Hyers Ulam stability

Stability of a Generalized Quadratic Functional Equation in Schwartz Distributions

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Acta Mathematica Sinica,English Series 2009年第9期25卷 1459-1468页

作者： Jae-young chung Department of Mathematics Kunsan National University Kunsan 573-701 Republic of Korea

We consider the Hyers-Ulam stability problem of the generalized quadratic functional equationuoA＋voB-2woP1 - 2ko P2 =0, which is a distributional version of the classical generalized quadratic functional equation f（... 详细信息

关键词： Hyers-Ulam stability generalized quadratic functional equation distribution heat kernel

Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy

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Chinese Physics Letters 2012年第12期29卷 39-43页

作者： KIM chung-Seok JHANG Kyung-young Metallurgy and Materials Engineering Chosun UniversitySeosuk-dongGwangju501-759South Korea Mechanical Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea

The acoustic nonlinearity of surface waves is studied to evaluate plastic deformation in aluminum alloys.A narrow-band surface wave is successfully generated by a pulsed Nd-YAG laser system consisting of a beam expander and a slit *** degrees of tensile deformation are induced by interrupting the tensile tests so as to obtain aluminum specimens with different degrees of plastic *** normalized acoustic nonlinearity increases as a function of tensile *** experimental results show that the acoustic nonlinearity of a laser-generated surface wave has a good correlation with the level of tensile deformation and has a potential to evaluate microdamage induced by dislocation microplasticity.

关键词： deformation nonlinearity Deform

Fatigue-Induced Micro-damage Characterization of Austenitic Stainless Steel 316 Using Innovative Nonlinear Acoustics

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Chinese Physics Letters 2012年第6期29卷 82-85页

作者： chung-Seok KIM Kyung-young JHANG Automotive Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea Mechanical Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea

We present innovative nonlinear acoustics for characterizing fatigue-induced micro-damage of austenitic stainless steel 316 subjected to high-cycle *** fatigue-driven deformations are accumulated at several positions near the middle of hourglass-shaped specimens.A bell-shaped curve of acoustic nonlinearity as a function of position is observed,and the variation in acoustic nonlinearity is attributed to the evolution of a lattice defect (dislocation) and stress-induced martensite based on transmission electron microscopy (TEM) *** oblique incidence technique using a longitudinal waveform is a potentially viable method for characterizing the high-cycle fatigue deformation of austenitic stainless steel 316 alloys.

关键词： fatigue steel martensite

Ubiquitous Sensor Network for Chemical Sensors

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稀有金属材料与工程 2006年第A03期35卷 400-404页

作者： Wan-young chung Risto Myllylae Division of Computer & Internet Eng. Dongseo UniversityBusan 617-716Korea Dept.of Electrical and Information Eng. University of OuluLinnanmaa 90570 OuluFinland

Wireless sensor networks have been identified as one of the most important technologies for the 21 st *** advances in micro sensor fabrication technology and wireless communication technology enable the practical deployment of large-scale,low-power,inexpensive sensor *** an approach offers an advantage over traditional sensing methods in many ways:large-scale,dense deployment not only extends spatial coverage and achieves higher resolution,but also increases the system's fault-tolerance and ***,the ad-hoc nature of wireless sensor networks makes them even more attractive for military and other risk-associated applications,such as environmental observation and habitat monitoring.

关键词： ubiquitous sensor network wireless sensor network sensor network platform sensor node chemical sensors

Lithium plating-free 1 Ah-level high-voltage lithium-ion pouch battery via ambi-functional pentaerythritol disulfate

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Journal of Energy Chemistry 2023年第8期83卷 229-238,I0007页

作者： Dung Tien Tuan Vu Jinsol Im Jae-Hee Kim Jisoo Han Gyeong Jun chung Giang Thi Huong Nguyen Junhyeok Seo Minjae Kim eui-Hyung Hwang young-Gil Kwon Jae Wook Shin Kuk young Cho Seung-Wan Song Department of Chemical Engineering&Applied Chemistry Chungnam National UniversityDaejeon 34134Republic of Korea Department of Materials Science&Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Fine Chem Co.Ltd. Daejeon 34365Republic of Korea d CSIM Co.Ltd. Yesan 32400Republic of Korea Dongwha Electrolyte Nonsan 32925Republic of Korea

Elevating the charge cut-off voltage beyond traditional 4.2 V is a commonly accepted technology to increase the energy density of Li-ion batteries(LIBs) but the risk of Li-dendrites and fire hazard increases as well. The use of ambi-functional additive, which forms stable solid electrolyte interphase(SEI) simultaneously at both cathode and anode, is a key to enabling a dendrites-free and well-working high-voltage LIB. Herein, a novel ambi-functional additive, pentaerythritol disulfate(PEDS), at 1 wt% without any other additive is demonstrated. We show the feasibility and high impacts of PEDS in forming lithium sulfateincorporated robust SEI layers at NCM523 cathode and graphite anode in 1 Ah-level pouch cell under4.4 V, 25 °C and 0.1 C rate, which mitigates the high-voltage instability, metal-dissolution and cracks on NCM523 particles, and prevents Li-dendrites at graphite anode. Improved capacity retention of 83%after 300 cycles is thereby achieved, with respect to 69% with base electrolyte, offering a promising path toward the design of practical high-energy LIBs.

关键词： Lithium-ion pouch cell Lithium plating-free High-voltage Ambi-functional additive SEI layer