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International Journal of Disaster Risk Science 2022年第2期13卷 190-198页

作者： Seong-Jin Lee joong-hoo park Seung-Min Cha Donghyun Kim Department of Public Policy and Management.Pusan National University Busan 46241South Korea Department of Urban Planning and Engineering Pusan National UniversityBusan 46241South Korea

The coronavirus disease 2019(COVID-19) is a global pandemic that has heavily impacted not only the health sector, but also the economic sector in *** countries have projected a negative economic impact, and the effect on micro-, small-, and medium-sized enterprises(MSMEs) is predicted to be significantly *** study estimated the regional resistance of MSME sales revenues and identified the regional economic factors that affect resistance by analyzing South Korea, a country with one of the lowest economic impact projections from COVID-19. Resistance was estimated by comparing sales revenues and changes in resistance observed during the early COVID-19 period to those recorded in the same weeks(weeks 6 to 9) of 2019. The factors that affect regional resistance were determined by conducting robust regression and spatial regression analyses. The results show that the number of confirmed COVID-19 cases, a direct risk factor, is negatively related to regional resilience, while diversity is positively related to regional resistance. To improve the regional resistance against uncertain events, this study recommends increased diversity among regional industrial structures to reduce the duration of the early shock of an unexpected adverse event.

关键词： COVID-19 Economic resistance MSMEs South Korea

Ionizing terahertz waves with 260 MV/cm from scalable optical rectification

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Light(Science & Applications) 2024年第6期13卷 1075-1087页

作者： Hyeongmun Kim Chul Kang Dogeun Jang Yulan Roh Sang Hwa Lee joong Wook Lee Jae Hee Sung Seong Ku Lee Ki-Yong Kim Advanced Photonics Research Institute GISTGwangju61005Korea Department of Physics and Optoelectronics Convergence Research Center Chonnam National UniversityGwangju61186Korea Pohang Accelerator Laboratory POSTECHPohang37673Korea Center for Relativistic Laser Science Institute for Basic ScienceGwangju61005Korea Institute for Research in Electronics and Applied Physics Department of PhysicsUniversity of MarylandCollege ParkMaryland20742USA

Terahertz(THz)waves,known as non-ionizing radiation owing to their low photon energies,can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and ***,we demonstrate the generation of ionizing,multicycle,15-THz waves emitted from large-area lithium niobate crystals via phase-matched optical rectification of 150-terawatt laser pulses.A complete characterization of the generated THz waves in energy,pulse duration,and focal spot size shows that the field strength can reach up to 260 megavolts per *** particular,a single-shot THz interferometer is employed to measure the THz pulse duration and spectrum with complementary numerical *** intense THz pulses are irradiated onto various solid targets to demonstrate THz-induced tunneling ionization and plasma *** study also discusses the potential of nonperturbative THz-driven ionization in gases,which will open up new opportunities,including nonlinear and relativistic THz physics in plasma.

关键词： optical interferometer matched

Stable Zn Metal Anodes with Limited Zn-Doping in MgF_(2) Interphase for Fast and Uniformly Ionic Flux

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Nano-Micro Letters 2022年第3期14卷 169-183页

作者： Ji Young Kim Guicheng Liu Ryanda Enggar Anugrah Ardhi Jihun park Hansung Kim joong Kee Lee Energy Storage Research Center Korea Institute of Science and TechnologyHwarang‑ro 14‑gil 5Seongbuk‑guSeoul 02792Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei‑roSeodaemun‑guSeoul 03722Republic of Korea Department of Physics Dongguk UniversitySeoul 04620Republic of Korea APC Technology 10868 Gangbyeonyeok‑ro‑4‑gilGwangjin‑guSeoul 05116Republic of Korea Department of Energy and Environmental Engineering KIST SchoolKorea University of Science and TechnologyHwarang‑ro 14‑gil 5Seongbuk‑guSeoul 02792Republic of Korea

The practical applications of aqueous Zn metal batteries are currently restricted by the inherent drawbacks of Zn such as the hydrogen evolution reaction,sluggish kinetics,and dendrite *** address these problems,herein,a limitedly Zn-doped MgF_(2)interphase comprising an upper region of pure,porous MgF_(2)and a lower region of gradient Zn-doped MgF_(2)is achieved via radio frequency sputtering *** porous MgF_(2)region is a polar insulator whose high corrosion resistance facilitates the de-solvation of the solvated Zn ions and suppression of hydrogen evolution,resulting in Zn metal electrodes with a low interfacial *** Zn-doped MgF_(2)region facilitates fast transfer kinetics and homogeneous deposition of Zn ions owing to the interfacial polarization between the Zn dopant and MgF_(2)matrix,and the high concentration of the Zn dopant on the surface of the metal substrate as fine ***,a symmetric cell incorporating the proposed Zn metal exhibits low overpotentials of~27.2 and~99.7 mV without Zn dendrites over 250 to 8000 cycles at current densities of 1.0 and 10.0 mA cm−2,*** developed Zn/MnO2 full cell exhibits superior capacity retentions of 97.5%and 84.0%with average Coulombic efficiencies of 99.96%after 1000 and 3000 cycles,respectively.

关键词： Zinc metal battery MgF_(2)layer Limited zinc doping Ion-transfer kinetic Deposition guidance

Comparative Optical Separation of Racemic Ibuprofen by Using Chiral Stationary Phase

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Chinese Journal of Chemical Engineering 2002年第6期10卷 681-685页

作者： Dalkeun park joong Kee LEE 等 Nano-EcoResearchCenter KISTSeoul136-791Korea ChemicalEngineeringDepartment HongikUniversitySeoul121-791Korea

Ibuprofen is widely used as a non-steroidal anti-inflammatory drug and produced as racemic mixture. Its pharmacological activity resides only in S-(+)-enantiomer, and R-()-enantiomer is not only inactive but also has many side effects. Thus it is necessary to separate R-enantiomer from racemic ibuprofen. We studied optical separation of racemic Ibuprofen with chiral high performance liquid chromatography (HPLC). Out of three different chiral stationary phases, which were selected on the basis of structure and availability, two were found to be ef-fective. There was optimum eluent composition for each stationary phase for good resolution in optical separation. Resolution decreased with increase of eluent flow rate, but effect of injection volume on resolution was insignificant at high eluent flow rate.

关键词：手性固体相外消旋布洛芬光学分离高效液相色谱对映体抗炎药

The current status of hormone treatment for prostate cancer patients in Korean real-world practice:a multi-institutional observational study

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Asian Journal of Andrology 2019年第2期21卷 115-120页

作者： Jung Kwon Kim Jung Jun Kim Taek Won Gang Tae Kyun Kwon Hong Sup Kim Seung Chui park Jae-Shin park Jong-Yeon park Seok joong Yoon Youn-Soo Jeon Jin Seon Cho Kwan joong Joo Sung-hoo Hong Seok-Soo Byun the Korean Urological Oncology Society Department of Urology Seoul National University Bundang HospitalSeongnam 13620Korea Department of Urology Hallym University Sacred Heart HospitalAnyang 14068Korea Department of Urology Kangbuk Samsung HospitalSeoul 03181Korea Department of Urology Seoul St.Mary HospitalSeoul 06591Korea 不详 Department of Urology Chonnam National University HospitalGwangju 61469Korea School of Medicine Kyungpook National University Medical CenterDaegu 41404Korea Department of Urology Konkuk University Medical CenterSeoul 05080Korea Department of Urology Wonkwang University HospitalIksan 54538Korea Department of Urology Daegu Catholic University Medical CenterDaegu 41911Korea Department of Urology Ulsan UniversityGangneung Asan HospitalGangneung 25440Korea Department of Urology Chungbuk National University HospitalCheongju 28644Korea Department of Urology Soonchunhyang University HospitalCheonan 31151Korea

We aimed to evaluate the current nationwide trend,efficacy,safety,and quality of life(QoL)profiles of hormone treatment in real-world practice settings for prostate cancer(PCa)patients in Korea.A total of 292 men with any biopsy-proven PCa(TanyNanyMany)from 12 institutions in Korea were included in this multi-institutional,observational study of prospectively collected *** luteinizing hormone-releasing hormone(LHRH)agonists were allowed to be investigational *** was defined as(1)the rate of castration(serum testosterone≤50 ng dl^-1)at 4-week visit and(2)breakthrough(serum testosterone>50 ng dl^-1 after castration).Safety assessments included routine examinations for potential adverse events,laboratory tests,blood pressure,body weight,and bone min era I density(BMD,at baseli ne and at the last follow-up visit).QoL was assessed using the Expa nded Prostate Cancer Index Composite-26(EPIC-26).The most comm on initial therapeutic regimen was LHRH agonist with an ti-androge n(78.0%),and the most commonly used LHRH agonist for combination and mono therapy was leuprolide(64.0%for combi natio n and 58.0%for monotherapy).The castration and breakthrough rates were 78.4%and 6.6%,*** laboratory results related to dyslipidemia worsened after 4 weeks of hormone *** addition,the mean BMD T-score was significantly lower at the last follow-up(mean:-1.950)compared to baseline(mean:-0.195).The mean total EPIC-26 score decreased from 84.8(standard deviation[s.d.]:12.2)to 78.3(s.d.:8.1),with significant deterioration only in the urinary domain(mean:23.5 at baseli ne and 21.9 at the 4-week visit).These findi ngs dem on strate the n ationwide trend of current practice setti ngs in hormone treatment for PCa in Korea.

关键词： efficacy hormonal treatment Korean population prostate cancer safety trend

Weave-pattern-dependent fabric piezoelectric pressure sensors based on polyvinylidene fluoride nanofibers electrospun with 50 nozzles

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npj Flexible Electronics 2022年第1期6卷 699-707页

作者： Da Bin Kim Ju Han Sun Min Sung Min Seong Kim Bo Kyoung Choi Sung Jun park Hyae Rim Hong Hong Je Choi Byeong Kon Kim Chung Hee park Jong hoo Paik Joon-Seok Lee Yong Soo Cho Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Textile Engineering and Technology Yeungnam UniversityGyeongsan 38541Republic of Korea Deparment of Textile Merchandising and Fashion DesignSeoul National UniversitySeoul 08826Republic of Korea Samsung Electro-Mechanics Co.Ltd. Suwon 16674Republic of Korea Ceratorq Inc. Seoul 08511Republic of Korea Electronic Materials and Component Center Korea Institute of Ceramic Engineering and TechnologyJinju 52851Republic of Korea

Wearable pressure sensors having versatile device structures have been extensively investigated to achieve high sensitivity under mechanical ***,we introduce piezoelectric pressure sensors based on fabrics woven using polyvinylidene fluoride(PVDF)weft and polyethylene terephthalate(PET)warp yarns with different weave structures:1/1(plain),2/2,and 3/3 weft rib *** dependence of the pressure-sensing performance on the weave pattern is demonstrated with an actual large-scale fabric up to the~2 m *** optimized pressure sensor with a 2/2 weft rib pattern produced a high sensitivity of 83 mV N−1,which was 245%higher than that of the 1/1 *** detection performance of the optimal fabric was extensively evaluated with a variety of ambient input sources,such as pressing,bending,twisting,and crumpling,as well as various human ***,a large allfabric pressure sensor with arrayed touch pixel units demonstrated highly sensitive and stable sensing performance.

关键词： pattern fluoride piezoelectric

Employment of encapsulated Si with mesoporous TiO_2 layer as anode material for lithium secondary batteries

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中国有色金属学会会刊：英文版 2009年第4期19卷 1023-1026页

作者： Sang-Eun park Bo-Eun KIM Sang-Wha LEE joong-Kee LEE Advanced Energy Materials Processing Laboratory Korea Institute of Science and Technology Department of Chemical & Bio Engineering Kyungwon University

Silicon composite of nano-capsule type is newly applied as an active anode material for lithium ion ***2-encapsulated silicon powders were synthesized by a sol-gel reaction with titanium *** nanoparticles were successfully embedded into porous titanium oxide capsules that played as a buffer layer against drastic volume changes of silicon during the charge-discharge cycling,consequently leading to the retardation of the capacity fading of intrinsic silicon *** electrochemical and structural properties of silicon nanocomposites with different surface areas of encapsulating TiO2 layer were characterized by X-ray diffraction(XRD),nitrogen gas adsorption analysis by the Brunauer-Emmett-Teller(BET) equation,transmission electron microscopy(TEM),and galvanostatic charge-discharge experiments.

关键词：二氧化钛硅材料锂二次电池负极材料封装纳米复合材料透射电子显微镜就业

EFFECT OF FABRICATION ON HIGH CYCLE FATIGUE PROPERTIES OF COPPER THIN FILMS

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Acta Mechanica Solida Sinica 2008年第4期21卷 318-326页

作者： Jun-Hyub park joong-Hyok An Yun-Jae Kim Hyeon-Chang Choi Department of Mechatronics Engineering College of EngineeringTongmyong University535Yongdang-DongNam-GuBusan608-711Korea Department of Mechanical Engineering College of EngineeringKorea UniversityAnam-dong Seongbuk-GuSeoul136-701Korea

The influence of fabrication on the tensile and fatigue behavior of copper films manufactured by 3 kinds of fabrication methods was investigated. The tensile and high cycle fatigue tests were performed using the test machine developed by authors. Young＇s moduli （72, 71 and 69 GPa, respectively） are lower than the literature values （108-145 GPa）, while the yield strengths were as high as 358, 350 and 346 MPa, respectively and the ultimate strengths as 462, 456 and 446 MPa, respectively. There is not much difference in the tensile properties of the 3 kinds of films. There is little difference in the fatigue properties of the 3 kinds of films but one of them has shorter fatigue life than others in high cycle region and longer fatigue life than others in low cycle region.

关键词： mechanical properties thin film copper high cycle fatigue test

Optical Gain Analysis of Graded InGaN/GaN Quantum-Well Lasers

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Chinese Physics Letters 2011年第7期28卷 319-322页

作者： Seoung-Hwan park Yong-Tae Moon Jeong Sik Lee Ho Ki Kwon joong Seo park Doyeol Ahn Department of Electronics Engineering Catholic University of DaeguHayangKyeongsanKyeongbuk 712-702Republic of Korea SLED R&D Center LG Innotek16 Woomyeon-dongSeocho-guSeoul 137-140Republic of Korea Department of Electrical and Computer Engineering University of SeoulSeoul 130-743Republic of Korea

Optical properties of graded InGaN/GaN quantum well(QW)lasers are analyzed as improved gain media for laser diodes emitting near 500 *** results are compared with those of conventional InGaN/GaN QW *** heavy-hole effective mass around the topmost valence band is found to nearly not be affected by the inclusion of the graded *** graded InGaN/GaN QW structure shows a much larger matrix element than the conventional InGaN/GaN QW *** radiative current density dependences of the optical gain are similar to each ***,the graded QW structure is expected to have lower threshold current density than the conventional QW structure because the former has a lower threshold carrier density than the latter.

关键词： InGaN/GaN graded Lasers

Characteristics of Atmospheric Circulation Associated with Cold Surge Occurrences in East Asia:A Case Study During 2005/06 Winter

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Advances in Atmospheric Sciences 2008年第5期25卷 791-804页

作者： Tae-Won park Jee-hoon JEONG Chang-Hoi HO Seong-joong KIM School of Earth and Environmental Sciences Seoul National University Seoul Korea Department of Earth Sciences University of Gothenburg Gothenburg Sweden Korea Polar Research Institute Incheon Korea

The characteristics of the upper-level circulation and thermodynamical properties for the period when two distinct cold surges broke out over East Asia during the 2005/06 winter are investigated. From early December 2005 to early January 2006, exceptionally cold weather lasted for approximately one month due to two successive cold surges that took place on 2 December 2005 and 2 January 2006, respectively. This study reveals that both involve the upper-tropospheric circulation, which induces the amplification and expansion of the surface Siberian high toward East Asia, but arose from different causes： the former is caused by the upper-level blocking originated from the North Pacific and the latter is caused by the upper-level wave train across the Eurasian Continent. In particular, it is suggested that the lower-tropospheric anomalous wind caused by upper-level circulation anomalies and a steep meridional temperature gradient amplified by phase-locked annual cycle combined to induce very strong cold advection in East Asia, which resulted in exceptionally cold weather that lasted for several weeks. The present results emphasize that the characteristics of the upper-tropospheric circulation can be considered as important precursors to cold surge occurrences in East Asia.

关键词： cold surge Siberian high East Asia East Asian winter monsoon upper-tropospheric circulation