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Verification of Damage Detection Algorithm by Prototype Building Structure Test

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Engineering（科研） 2013年第10期5卷 827-835页

作者： ji-hyun hwang Ki-Tae Park Structural Engineering Research Division Korea Institute of Construction Technology Goyang South Korea

Safety related accidents of buildings and civil engineering structures have been reported all over the world. With the increasing importance of securing the safety of social infrastructure and optimum performance levels to prevent these accidents, a lot of attention has been concentrated on monitoring performance degradation due to structural defects and deterioration. In this study, the algorithm was developed to evaluate the safety of structures by analyzing signals of time domain and frequency domain, and the developed algorithm was verified through a forced vibration test. From the results of time-domain and frequency-domain data analysis, the damage detection results by each sensor location with a high degree of accuracy were derived in both methods.

关键词： Infrastructure Algorithm Vibration Test Damage Detection

Experimental Study on the Mechanical Properties of FRP Bars by Hybridizing with Steel Wires

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Engineering（科研） 2014年第7期6卷 365-373页

作者： ji-hyun hwang Dong-Woo Seo Ki-Tae Park Young-Jun You Structural Engineering Research Division Korea Institute of Construction Technology Goyang Korea

Many studies on fiber reinforced polymer composite bars, as a substitute for reinforcing bars, have been conducted to solve corrosion of steel in reinforced concrete structures since 1960s’. However, FRP Bars have a lower elastic modulus than steel rebar as a structural component of concrete structures. Material properties with brittleness fracture and low elastic modulus can be improved by combining cheaper steel than carbon or aramid fibers. In this study, prototypes of FRP Bars with inserted steel wires (i.e., “FRP Hybrid Bars”) were developed and their tensile performance was compared depending on the proportion and diameter of steel. The FRP Hybrid Bars were made by dividing them into D13 and D16 according to the diameter and proportion of inserted wires: GFRPs were combined with wires having different diameters of 0.5 mm, 1.0 mm, and 2.0 mm in the proportion of 10%, 30%, 50%, and 70%, respectively. As a result of tensile tests, the elastic modulus of FRP Hybrid Bars were improved as 20% - 190% in comparison with the fully GFRP Bars.

关键词： Fiber-Reinforced Polymer (FRP) FRP Hybrid Bar Tensile Test Steel Wire

Brain age estimation:premise,promise,and problems

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Neural Regeneration Research 2025年第8期20卷 2313-2314页

作者： Jarrad Perron ji hyun Ko Graduate Program in Biomedical Engineering Price Faculty of EngineeringUniversity of ManitobaWinnipegMBCanada PrairieNeuro Research Centre Kleysen Institute for Advanced MedicineHealth Sciences CentreWinnipegMBCanada Department of Human Anatomy and Cell Science Rady Faculty of Health SciencesUniversity of ManitobaWinnipegMBCanada

Premise:The com bined effects of modern healthcare practices which prolong lifespan and declining birthrates have created unprecedented changes in age demographics worldwide that are especially pronounced in Japan,South Korea,Europe,and North *** old age is the most significant predictor of dementia,global healthcare systems must rise to the challenge of providing care for those with neurodegenerative disorders.

关键词： estimation providing birth

Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑Chang Sung Gwang‑Hee Lee Byoungjoon hwang Sojung Seo ji‑Hun Seo Dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

Bee Venom Acupuncture Induced Skin Patch Discoloration Persisting for More than 3 Years:A Case Report

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Chinese Journal of Integrative Medicine 2021年第10期27卷 774-777页

作者： ji Hye hwang Department of Acupuncture&Moxibustion Medicine College of Korean MedicineGachon UniversitySeongnam(13120)Republic of Korea

Bee venom(BV),one of the most commonly encountered types of animal venom,consists of a mixture of chemical agents that cause allergic reactions in the human body.⑴BV therapy,in which BV is exploited for medicinal purposes,is available worldwide,mainly used in Asia,Eastern Europe,and South America.(2)BV therapy has been applied to treat a diverse set of diseases including various musculoskeletal conditions such as arthritis and rheumatism,arthralgia,chronic recalcitrant neuralgia,(3-5)Parkinson's disease,(6,7)postherpetic neuralgia,(8)and morphea.(9)Although the therapeutic utility of BV has been demonstrated,extensive studies regarding the safety of BV as a therapeutic agent have identified potential side effects,ranging from minor skin reactions that typically resolve over several days to severe life-threatening immune responses such as anaphylaxis.

关键词： Acupuncture diseases Bee

Eradication of Solenopsis invicta by pyriproxyfen at the Shihmen Reservoir in northern Taiwan

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Insect Science 2009年第6期16卷 493-501页

作者： ji-Sen hwang Department of Natural Science Graduate School of Environmental Education and Resources Taipei Municipal University of EducationTaiwan China

The aim of this study was to investigate the possibility of eradicating the red imported fire ant, Solenopsis invicta Buren, in the hot, humid and rainy conditions of northern Taiwan. Thirteen hectares of the Shihmen Reservoir have been infected with these ants, with a total of 1 578 mounds. Pyriproxyfen was applied at a rate of 2 kg/hectare each season, for a total of four seasons. Surveys using visual examination, bait traps, as well as the population index method showed that the brood, the reproductive ants, and the worker ants within the nests were all significantly reduced 1 month after the first application of pyriproxyfen. Four months after the initial application there were no more brood or reproductive ants. After 8 months there were no longer any active mounds left, and 12 months later there were no more worker ants. After monitoring for 1 more year, it was ascertained that the red imported fire ants were eradicated. The percentages of decrease after 2, 4 and 6 months of treatment were 57.4%, 80.5%, and 98.2%, respectively.

关键词： eradication insect growth regulator pyriproxyfen red imported fire ant,Solenopsis invicta

Measurement of alumina film induced ablation of internal insulator in solid rocket environment

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Defence Technology（防务技术） 2023年第11期29卷 181-192页

作者： ji-Yeul Bae In Sik hwang Yoongoo Kang Agency for Defense Development 160488th Bukyuseong-streetDaejeonSouth Korea

This study investigates the ablation of internal insulation induced by the deposition of an alumina film with different lateral film speeds.A sub-scale test solid rocket motor(SRM)was designed in an impinging jet configuration to form an alumina film on the sample and to encourage the lateral movement of the film by a high-speed wall *** static fire tests of the test SRM were conducted with six different jet velocities(V_(jet)=100 m/s,150 m/s,200 m/s,268 m/s,330 m/s,and 450 m/s)that indirectly affected the velocity of the wall jet and the deposition rate of alumina *** ablation velocity was deduced from the difference in the sample thickness after a test using a coordinate measuring *** droplet deposition mass flux and wall jet velocity were obtained via two-phase flow simulation with the same jet velocity and effective *** a result,the characteristics of alumina-induced ablation and the changes in ablation with jet velocities were *** area within0.8×jet diameter was focused upon,where the ratio of ablation velocity to incoming alumina mass was constant for each jet velocity,and showed a similarity in jet *** the ablation velocity was increased from 2.05 to 9.98 mm/s with increasing jet velocity,the ratio of the ablation velocity and alumina mass flux decreased from 1.07×10^(-4)to 0.49×10^(-4)m^(3)/kg as Al_(2)O_(3)-C reactions became less efficient with a reduced residence time of the *** the decrease in residence time by the wall jet is more pronounced for slow reactions involved in Al_(2)O_(3)-C reactions,fast reactions in Al_(2)O_(3)-C reactions are less affected and result in a convergence of the volumetric rate of ablation per unit mass of alumina.

关键词： Internal insulation Solid rocket motor Ablation Alumina

阳极多孔三氧化二铝模板孔对化学蒸气沉积合成纳米材料的作用研究(英文)

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吉林师范大学学报（自然科学版） 2009年第3期30卷 11-15页

作者：权铭会郑昌熙黄芝贤申容淑朴钟允仁川大学物理学科成均馆大学校

在各种化学蒸气沉积生长排列整齐的纳米材料的合成方法中,阳极三氧化二铝(AAO)模板被广泛采用主要由于容易通过电压和阳极氧化时间来控制其孔径.这里,我们表征存在/不存在催化剂时生长在AAO模板上的碳纳米管和氧化物材料的生长机理.我... 详细信息

在各种化学蒸气沉积生长排列整齐的纳米材料的合成方法中,阳极三氧化二铝(AAO)模板被广泛采用主要由于容易通过电压和阳极氧化时间来控制其孔径.这里,我们表征存在/不存在催化剂时生长在AAO模板上的碳纳米管和氧化物材料的生长机理.我们还研究了在合成密集整齐排列的纳米结构生长过程中氢气的还原效应.实验结果显示AAO模板本身促进Ga2O3VS生长机理,氧化物催化剂氢化还原提高了碳纳米管的生长速率和结晶度.氢化还原中使用AAO模板可以很好地控制排列整齐的纳米材料的直径和密度.

关键词：孔型AAO模板化学蒸气沉积纳米材料

Brazilin and Caesalpinia sappan L. extract protect epidermal keratinocytes from oxidative stress by inducing the expression of GPX7

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Chinese Journal of Natural Medicines 2018年第3期16卷 203-209页

作者： hyung Seo hwang Joong hyun Shim Department of Oriental Cosmetic Science Semyung University

Caesalpinia sappan L., belonging to the family Leguminosae, is a medicinal plant that is distributed in Southeast Asia. The dried heartwood of this plant is used as a traditional ingredient of food, red dyes, and folk medicines in the treatment of diarrhea, dysentery, tuberculosis, skin infections, and inflammation. Brazilin is the major active compound, which has exhibited various phar- macological effects, including anti-platelet activity, anti-hepatotoxicity, induction of immunological tolerance, and anti-inflammatory and antioxidant activities. The present study aimed to evaluate the antioxidant activity and expression of antioxidant enzymes of C. sappan L. extract and its major compound, brazilin, in human epidermal keratinocytes exposed to UVA irradiation. Our results indi- cated that C. sappan L. extract reduced UVA-induced H202 production via GPX7 activation. Moreover, brazilin exhibited anfioxidant effects that were similar to those of C. sappan L. via glutathione peroxidase 7 （GPX7）, suggesting that C. sappan L. extract and its natural compound represent potential treatments for oxidative stress-induced photoaging of skin.

关键词： Caesalpinia sappan L. Brazilin Ultraviolet GPX7 Antioxidative