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Frequency comb-to-comb stabilization over a 1.3-km free-space atmospheric optical link

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Light(Science & Applications) 2022年第9期11卷 2207-2216页

作者： JAEWON YANG DONG IL lee DONG-CHEL SHIN jaehyun lee BYUNG SOO KIM HYUN JAY KANG YOUNG-JIN KIM SEUNG-WOO KIM Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Presently with Korea Research Institute of Standards and Science(KRISS) 267 Gajeong-roYuseong-guDaejeon 34113Republic of Korea

Stabilizing a frequency comb to an ultra-stable optical frequency reference requires a multitude of optoelectronic peripherals that have to operate under strict ambient ***,the frequency comb-to-comb stabilization aims to synchronize a slave comb to a well-established master comb with a substantial saving in required equipment and ***,we report an utmost case of frequency comb-to-comb stabilization made through a 1.3 km free-space optical(FSO)link by coherent transfer of two separate comb lines along with a feedback suppression control of atmospheric phase *** FSO link offers a transfer stability of 1.7×10-15 at 0.1 s averaging,while transporting the master comb,s stability of 1.2×10-15 at 1.0 s over the entire spectrum of the slave *** remote comb-to-comb stabilization is intended to expedite diverse long-distance ground-to-ground or ground-to-satellite applications;as demonstrated here for broadband molecular spectroscopy over a 6THz bandwidth as well as ultra-stable microwaves generation with phase noise of-80dBc Hz-1 at 1 Hz.

关键词： optical stabilization microwave

Crystallographically vacancy‐induced MOF nanosheet as rational single‐atom support for accelerating CO_(2)electroreduction to CO

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Carbon Energy 2024年第8期6卷 49-62页

作者： Jin Hyuk Cho Joonhee Ma Chaehyeon lee Jin Wook Lim Youngho Kim Ho Yeon Jang jaehyun Kim Myung‐gi Seo Youngheon Choi Youn Jeong Jang Sang Hyun Ahn Ho Won Jang Seoin Back Jong‐Lam lee Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Lotte Chemical R&D Center DaejeonRepublic of Korea Department of Chemical Engineering Hanyang UniversitySeoulRepublic of Korea School of Chemical Engineering and Material Science Chung‐Ang UniversitySeoulRepublic of Korea

To attain a circular carbon economy and resolve CO_(2)electroreduction technology obstacles,single‐atom catalysts(SACs)have emerged as a logical option for electrocatalysis because of their extraordinary catalytic *** SACs,metal–organic frameworks(MOFs)have been recognized as promising support materials because of their exceptional ability to prevent metal *** study shows that atomically dispersed Ni single atoms on a precisely engineered MOF nanosheet display a high Faradaic efficiency of approximately 100%for CO formation in H‐cell and three‐compartment microfluidic flow‐cell reactors and an excellent turnover frequency of 23,699 h−1,validating their intrinsic catalytic *** results suggest that crystallographic variations affect the abundant vacancy sites on the MOF nanosheets,which are linked to the evaporation of Zn‐containing organic linkers during ***,using X‐ray absorption spectroscopy and density functional theory calculations,a comprehensive investigation of the unsaturated atomic coordination environments and the underlying mechanism involving CO^(*)preadsorbed sites as initial states was possible and provided valuable insights.

关键词： 2‐dimensional material carbon dioxide reduction metal-organic frameworks single‐atom catalysts vacancy sites

Enabling Variability-Aware Design-Technology Co-Optimization for Advanced Memory Technologies

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Journal of Microelectronic Manufacturing 2020年第4期3卷 69-81页

作者： Salvatore MAmoroso Plamen Asenov jaehyun lee Nara Kim Ko-Hsin lee Yaohua Tan Yong-Seog Oh lee Smith Xi-Wei Lin Victor Moroz Synopsys Europe Ltd.GlasgowG38HBUK Synopsys Korea Pankyoyeokro 235Gyeonggi-do13494 South Korea Synopsys Taiwan Co. Ltd.Chupei 302Taiwan Synopsys Inc.Mountain ViewCA 94043 USA

This paper presents a TCAD-based methodology to enable Design-Technology Co-Optimization(DTCO)of advanced semiconductor *** reviewing the DTCO approach to semiconductor devices scaling,we introduce a multi-stage simulation flow to study the deviceto-circuit performance of advanced memory technologies in presence of statistical and process *** present a DRAM example to highlight the DTCO enablement for both memory and *** analysis demonstrates how the evaluation of different possible technology improvements and design combinations can be carried out to maximize the benefits of continuous technology scaling for a given set of manufacturing equipment.

关键词： DTCO Statistical Variability Process Variability Semiconductor Memories DRAM CMOS Scaling.

Combination-based nanomaterial designs in single and double dimensions for improved electrodes in lithium ion-batteries and faradaic supercapacitors

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Journal of Energy Chemistry 2019年第11期28卷 119-146页

作者： Tuyet Nhung Pham Duckshin Park Yongil lee Il Tae Kim jaehyun Hur You-Kwan Oh Young-Chul lee Department of BioNano Technology Gachon University1342 SeongnamdaeroSujeong-guSeongnam-siGyeonggi-do 13120Republic of Korea Korea Railroad Research Institute(KRRI) 176 Cheoldobakmulkwan-roUiwang-si 16105Gyeonggi-doRepublic of Korea Department of Chemical and Biological Engineering Gachon UniversitySeongnam-siGyeonggi-do 13120Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea

In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted special attention as a result of the rapid development of new electrode nanomaterials, especially hybrid nanomaterials, which can meet the increasingly higher requirements for future energy, such as the capability to deliver high-power performance and an extremely long life cycle. In these hybrid nanostructures, a series of synergistic effects and unique properties arising from the combination of individual components are a major factor leading to improved charge/discharge capability, energy density, and system lifetime. This paper describes the most recent progress in the growth of hybrid electrode materials for LIBs and FSs systems, focusing on the combination of zero-dimensional(0 D), one-dimensional(1 D), two-dimensional(2 D), and three-dimensional(3 D) nanomaterials, respectively.

关键词： Hybrid nanomaterials Synergistic effects Zero-dimensional nanomaterials One-dimensional nanomaterials Two-dimensional nanomaterials Three-dimensional nanomaterials

Characterization of particulate matter from diesel passenger cars tested on chassis dynamometers

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Journal of Environmental Sciences 2017年第4期29卷 21-32页

作者： Sungwoon Jung jaehyun Lim Sangil Kwon Sangwoo Jeon Jeongsoo Kim Jongtae lee Sunmoon Kim Transportation Pollution Research Center National Institute of Environmental Research Incheon Republic of Korea Division of Global Environment Research National Institute of Environmental Research Incheon Republic of Korea Compliance & Defects Investigation Office Korea Automobile Testing & Research Institute Hwasung Republic of Korea

Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter（DPF）, diesel oxidation catalyst（DOC）and exhaust gas recirculation（EGR） under the vehicle driving cycles and regulatory *** particle number emissions（PNEs） decreased gradually during speed-up of vehicle from 17.3 to 97.3 km/hr. As the average vehicle speed increases, the size-segregated peak of particle number concentration shifts to smaller size ranges of particles. The correlation analysis with various particulate components such as particle number concentration（PNC）,ultrafine particle number concentration（UFPNC） and particulate matter（PM） mass was conducted to compare gaseous compounds（CO, CO2, HC and NOx）. The UFPNC and PM were not only emitted highly in Seoul during severe traffic jam conditions, but also have good correlation with hydrocarbons and NOxinfluencing high potential on secondary aerosol generation. The effect of the dilution temperature on total PNC under the New European Driving Cycle（NEDC）, was slightly higher than the dilution ratio. In addition, the nuclei mode（DP： ≤ 13 nm） was confirmed to be more sensitive to the dilution temperature rather than other particle size ranges. Comparison with particle composition between vehicle speed cycles and regulatory cycle showed that sulfate was slightly increased at regulatory cycle, while other components were relatively similar. During cold start test, semivolatile nucleation particles were increased due to effect of cold environment. Research on particle formation dependent on dilution conditions of diesel passenger cars under the NEDC is important to verify impact on vehicular traffic and secondary aerosol formation in Seoul.

关键词： Diesel passenger cars Particle number emissions Correlation analysis Particle number concentration Ultrafine particle number concentration

Investigating the Relationships among Leisure, Coping, and Personal Growth among People with Physical Disabilities

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International Journal of Mental Health Promotion 2021年第4期23卷 533-543页

作者： Junhyoung Kim jaehyun Kim Chungsup lee Namyun Kil Youngkhill lee Department of Health&Wellness Design Indiana UniversityBloomingtonIN 47405USA Department of Recreation Therapeutic Recreation&TourismSuny BrockportBrockportNY 14420USA Department of Recreation and Leisure Studies California State UniversityLong BeachCA 90840USA Department of Recreation Management and Therapeutic Recreation University of Wisconsin-La CrosseLa CrosseWI 54601USA Department of Kinesiology Calvin CollegeGrand RapidsMI 49546USA

Little information exists with regard to the relationship between leisure and coping mechanisms among people with physical *** purpose of this study is to investigate the relationships among leisure,coping,and personal growth among people with physical disabilities living in the *** a purposive sampling strategy,121 participants completed all 3 instruments:assessment of leisure and recreation involvement,coping strategy indicator,and personal ***,descriptive analysis,Pearson correlations,and path analysis were utilized to test the relationship between leisure involvement,coping strategies,and personal *** were statistically significant direct effects of leisure involvement and avoidance-withdrawal coping strategies on personal *** effects of social support seeking coping strategies and problem-solving coping strategies on personal growth were not statistically *** also indicated that leisure involvement had significant direct effects on social support seeking,avoidance-withdrawal,and problem-solving coping *** results demonstrated that leisure engagement was associated with coping strategies and personal *** particular,leisure engagement had direct effects on problem-solving coping,social seeking coping,and avoidance/withdrawal coping as well as a direct effect on personal growth.

关键词： Leisure coping mental health personal growth physical disability

Two-Terminal Lithium-Mediated Artificial Synapses with Enhanced Weight Modulation for Feasible Hardware Neural Networks

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Nano-Micro Letters 2023年第5期15卷 236-253页

作者： Ji Hyun Baek Kyung Ju Kwak Seung Ju Kim jaehyun Kim Jae Young Kim In Hyuk Im Sunyoung lee Kisuk Kang Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Recently,artificial synapses involving an electrochemical reaction of Li-ion have been attributed to have remarkable synaptic ***-terminal synaptic transistors utilizing Li-ion intercalation exhibits reliable synaptic characteristics by exploiting the advantage of nondistributed weight updates owing to stable ion ***,the three-terminal configurations with large and complex structures impede the crossbar array implementation required for hardware neuromorphic ***,achieving adequate synaptic performances through effective Li-ion intercalation in vertical two-terminal synaptic devices for array integration remains ***,two-terminal Au/LixCoO_(2)/Pt artificial synapses are proposed with the potential for practical implementation of hardware neural *** Au/LixCoO_(2)/Pt devices demonstrated extraordinary neuromorphic behaviors based on a progressive dearth of Li in LixCoO_(2)*** intercalation and deintercalation of Li-ion inside the films are precisely controlled over the weight control spike,resulting in improved weight control *** types of synaptic plasticity were imitated and assessed in terms of key factors such as nonlinearity,symmetricity,and dynamic ***,the LixCoO_(2)-based neuromorphic system outperformed three-terminal synaptic transistors in simulations of convolutional neural networks and multilayer perceptrons due to the high linearity and low programming *** impressive performances suggest the vertical two-terminal Au/LixCoO_(2)/Pt artificial synapses as promising candidates for hardware neural networks.

关键词： Artificial synapse Neuromorphic Li-based Two-terminal Synaptic plasticity

Outdoor position estimation based on a combination system of GPS-INS by using UPF

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Journal of Measurement Science and Instrumentation 2013年第1期4卷 47-51页

作者： Yunki Kim jaehyun Park Jangmyung lee Dept.of Electrical Engineering Pusan National UniversityPusan 609-735Korea

This paper proposes a technique that global positioning system(GPS)combines inertial navigation system(INS)by using unscented particle filter(UPF)to estimate the exact outdoor *** system can make up for the weak point on position estimation by the merits of GPS and *** general,extended Kalman filter(EKF)has been widely used in order to combine GPS with ***,UPF can get the position more accurately and correctly than EKF when it is applied to real-system included non-linear,irregular distribution *** this paper,the accuracy of UPF is proved through the simulation experiment,using the virtual-data needed for the test.

关键词： global positioning system(GPS) unscented particle filter(UPF) navigation inertial navigation system(INS) strapdown inertial navigation system(SDINS)

Rapid crystallization-driven high-efficiency phase-pure deep-blue Ruddlesden–Popper perovskite light-emitting diodes

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Advanced Photonics 2023年第1期5卷 8-18页

作者： Gyumin Jang Hyowon Han Sunihl Ma Junwoo lee Chan Uk lee Wooyong Jeong jaehyun Son Dongki Cho Ji-Hee Kim Cheolmin Park Jooho Moon Yonsei University Department of Materials Science and EngineeringSeoulRepublic of Korea Sungkyunkwan University Department of Energy ScienceSuwonRepublic of Korea Institute for Basic Science Center for Integrated Nanostructure PhysicsSuwonRepublic of Korea

Perovskite light-emitting diodes(PeLEDs)are considered as promising candidates for nextgeneration solution-processed full-color ***,the external quantum efficiencies(EQEs)and operational stabilities of deep-blue(3 is hampered completely,so that phase-pure 2D-RPP films with bandgaps suitable for deep-blue PeLEDs can be obtained *** uniquely developed rapid crystallization method also enables formation of randomly oriented 2D-RPP crystals,thereby improving the transfer and transport kinetics of the charge ***,high-performance deep-blue PeLEDs emitting at 437 nm with a peak EQE of 0.63%are successfully *** color coordinates are confirmed to be(0.165,0.044),which match well with the Rec.2020 standard blue gamut and have excellent spectral stability.

关键词： Ruddlesden–Popper perovskite rapid crystallization deep-blue light-emitting diodes phase purity randomly oriented crystals