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High-Speed,High-Power Motor Design for a Four-Legged Robot Actuator Optimized using the Weighted Sum and Response Surface Methods

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CES Transactions on Electrical Machines and Systems 2021年第3期5卷 224-231页

作者： tae-woo lee Do-Kwan Hong tae-Uk Jung the Energy and Power Conversion Engineering Department University of Science and TechnologyChangwon51543 Korea Electric Machines and Drives Research Center Korea Electrotechnology Research InstituteChangwon51543 South Korea the Electrical Engineering Department Kyungnam UniversityChangwon51767 South Korea

In this paper,a design is presented for a high-speed,high-power motor for a four-legged robot actuator that was optimized using the weighted sum method(WSM)based on the Taguchi method,and the response surface method(RSM).First,output torque,torque constant,torque ripple,and efficiency were selected as objective functions for the optimized *** sampling method was implemented to use a mixed orthogonal array and the single response characteristics of each objective function were compared using the Taguchi ***,to consider the multi-response characteristic of the objective functions,WSM was ***,the 2D finite element analysis result of the RSM was compared with that using the ***,an experiment was carried out on the manufactured motor and the optimized model is presented here.

关键词： Four-legged robot Multiphysics analysis Optimized design Surface mounted permanent magnet synchronous motor

Power-aware transceiver design for half-duplex bidirectional chip-to-chip optical interconnects

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Journal of Semiconductors 2013年第12期34卷 60-65页

作者： Jamshid Sangirov Ikechi Augustine Ukaegbu Gulomjon Sangirov tae-woo lee Hyo-Hoon Park Electrical Engineering Department Korea Advanced Institute of Science and Technology (KAIST) Information and Communication Engineering Department Harbin Engineering University

A power-aware transceiver for half-duplex bidirectional chip-to-chip optical interconnects has been designed and fabricated in a 0.13 μm complementary metal-oxide-semiconductor （CMOS） technology. The transceiver can detect the presence and absence of received signals and saves 55% power in Rx enabled mode and 45% in Tx enabled mode. The chip occupies an area of 1.034 mm2 and achieves a 3-dB bandwidth of 6 GHz and 7 GHz in Tx and Rx modes, respectively. The disabled outputs for the Tx and Rx modes are isolated with 180 dB and 139 dB, respectively, from the enabled outputs. Clear eye diagrams are obtained at 4.25 Gbps for both the Tx and Rx modes.

关键词： optical transceiver power detector optical interconnect voltage regulator

Investigation into charge carrier dynamics in organic light-emitting diodes

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Nano Research Energy 2024年第2期3卷 39-46页

作者： Dong-Guang Zheng Hyeon-Dong lee Gyeong Won lee Dong-Soo Shin Jeongwon Kim Jong-In Shim Zhiqun Lin tae-woo lee Dong Ha Kim Information Engineering College Hangzhou Dianzi UniversityHangzhou 311305China Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Photonics and Nanoelectronics Hanyang University ERICA55 Hanyangdeahak-roSangnok-guAnsanGyeonggi 15588Republic of Korea Department of Chemistry and Nanoscience Ewha Womans University52Ewhayeodae-gilSeodaemun-guSeoul 03760Republic of Korea Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4Singapore 117585Singapore School of Chemical and Biological Engineering Institute of Engineering ResearchResearch Institute of Advanced MaterialsSoft FoundrySeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Basic Sciences Research Institute(Priority Research Institute) Ewha Womans UniversitySeoul 03760Republic of Korea Nanobio∙Energy Materials Center(National Research Facilities and Equipment Center) Ewha Womans UniversitySeoul 03760Republic of Korea

Organic light-emitting diodes(OLEDs)have demonstrated remarkable advancements in both device lifetime and luminous ***,insufficient operation lifetime due to device degradation remains a major hurdle,especially for brighter *** the degradation mechanisms of OLEDs due to the degradation of functional materials and the formation of defects in device architectures continues to be a significant ***,we evaluate the degradation characteristics by scrutinizing the electrical and optical properties,as well as analyzing the charge carrier dynamics in pristine and aged states of phosphorescent OLEDs(PhOLEDs).We show that degradation mechanisms in PhOLEDs can be elucidated in terms of the ideality factors of current and luminance in pristine and aged device *** consistent shifts in distinct ideality factors across various states points out that the device degradation is attributed to the deterioration of the guest material,***-light-emitting phosphorescent ***,the incongruity in ideality factor changes between the two states indicates that the degradation results from the deterioration of non-light-emitting *** characterization experiments provide further evidence that this degradation is primarily attributed to the deterioration of CBP-host *** thorough understanding of degradation mechanisms established in this study can contribute to realizing the highly reliable PhOLEDs with a long lifetime.

关键词： organic light-emitting diodes ideality factor carrier transport processes degradation mechanism

Hydrogen-bonded cation-composition-engineered color-stable blue PeLEDs

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Science Bulletin 2021年第21期66卷 2159-2161,M0003页

作者： Fengjun Chun Kyung Yeon Jang tae-woo lee Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826Republic of Korea Institute of Engineering Research.Research Institute of Advanced Materials.Nano Systems Institute Seoul National UniversitySeoul 08826Republic of Korea

Perovskite light-emitting diodes(PeLEDs)have been considered to be the most promising candidate for solid-state lighting and high-definition full-color display due to their attractive properties such as tunable emission wavelengths,narrow full width at half maximum(FWHM),and high photoluminescence quantum yield(PLQY)[1–3].The external quantum efficiencies(EQEs)of greenand red-emitting Pe LEDs have exceeded 20%,rocketing toward the theoretical limit[4,5],but the blue Pe LEDs still suffer from the obstacles of low efficiency and poor operational stability,which largely overshadows their real applications and industrialscale adoption.

关键词： tunable quantum attractive

Low cross-talk, deep subwavelength plasmonic metal/insulator/metal waveguide intersections with broadband tunability

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Photonics Research 2016年第6期4卷 272-276页

作者： tae-woo lee Da Eun lee Young Jin lee Soon-Hong Kwon Department of Physics Chung-Ang University

We suggest a low cross-talk plasmonic cross-connector based on a metal/insulator/metal cavity and *** separately investigate the isolated cavity mode, the waveguide mode, and the combination of cavity and waveguide modes using a finite-different time-domain method. Due to resonant tunneling and the cutoff frequency of the odd waveguide mode, our proposed structure achieves a high throughput transmission ratio and eliminates cross-talk. Furthermore, the proposed structure has a broadband tunability of 587 nm, which can be achieved by modulating the cavity air gap thickness. This structure enables the miniaturization of photonic integrated circuits and sensing applications.

关键词： mode Low cross-talk deep subwavelength plasmonic metal/insulator/metal waveguide intersections with broadband tunability

Suppressing surface plasmon losses to improve the efficiency of blue organic light-emitting diodes using the plasmonic quasi-bandgap phenomenon

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Photonics Research 2021年第9期9卷 1784-1795页

作者： tae-woo lee DOHONG KIM JUN HEE HAN SOMIN lee HOSEUNG lee SEUNGYEOP CHOI KYUNG CHEOL CHOI School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

It is a persistent problem in organic light-emitting diode(OLED)display devices that the efficiency of blue-light source materials is lower than that of green-or red-light source *** address this problem,numerous studies have investigated blue-light-emitting ***,ensuring the reliability of the blue-light-emitting materials has been difficult in most *** this study,electrodes using asymmetric dielectric/metal/dielectric structures with plasmonic quasi-bandgap characteristics were developed to achieve a highly efficient blue fluorescent *** electrodes were applied in a microcavity OLED and a transparent *** the developed electrode in fabricated OLED devices not only maximized the cavity resonance effect and transparency,but also preserved the advantage of the work function of the metal in terms of electrical properties,with high device *** approach also minimized losses caused by surface plasmon polaritons,which is a blind spot in the optical aspect of metal electrodes,resulting in improved light extraction efficiency.

关键词： light blue surface

Heat Transfer during Spray Cooling of Flat Surfaces with Water at Large Reynolds Numbers

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Journal of Flow Control, Measurement & Visualization 2016年第3期4卷 104-113页

作者： Milan Hnizdil Martin Chabicovsky Miroslav Raudensky tae-woo lee Laboratory of Heat Transfer and Fluid Flow Brno University of Technology Brno Czech Republic Mechanical and Aerospace Engineering SEMTE Arizona State University Tempe AZ USA

We present a new Nusselt number correlation for spray cooling at large Reynolds numbers and high surface temperatures for water sprays impinging perpendicularly onto a flat plate. A large set of experimental data on spray cooling of hot surfaces with water has been analyzed, including the water temperature effects. For large-scale cooling, such as in industrial processes, large number of injection parameters such as number, type, pressure, and angle of the spray injection has led to a multitude of correlations that are difficult for general and practical applications. However, by synthesizing a set of experimental data where all of the above parameters have been varied, we find that the Nusselt number and therefore the heat transfer coefficient can be cast accurately as a function of the Reynolds number. Water is widely used as the coolant during spray cooling, and has a specific phase change characteristic. At large Reynolds number (Re > 100,000) and surface temperature (Ts > 600°C) ranges, which are of interest in large-scale spray cooling, the effect of water temperature is quite significant as it affects the film boiling close to the surface. This effect also has been parameterized using experimental data.

关键词： Impinging Flow Spray Cooling Heat Transfer Measurements

Immortalization of epidural fat-derived mesenchymal stem cells: In vitro characterization and adipocyte differentiation potential

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World Journal of Stem Cells 2025年第1期17卷 40-52页

作者： Seoung-woo lee Young-Ju Lim Hee-Yeon Kim Wansoo Kim wook-tae Park Min-Jung Ma Junho lee Min-Soo Seo Young In Kim Sangbum Park Seong-Kyoon Choi Gun woo lee Core Protein Resources Center Daegu-Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea Department of Orthopedic Surgery Yeungnam University Medical CenterYeungnam University College of MedicineDaegu 42415South Korea Department of Veterinary Pathology College of Veterinary MedicineKyungpook National UniversityDaegu 41566South Korea School of Life Science BK21 FOUR KNU Creative BioResearch GroupKyungpook National UniversityDaegu 41566South Korea Laboratory of Veterinary Tissue Engineering College of Veterinary MedicineKyungpook National UniversityDaegu 41566South Korea College of Veterinary Medicine Kyungpook National UniversityDaegu 41566South Korea Department of Veterinary Tissue Engineering Kyungpook National UniversityDaegu 41566South Korea Cellexobio. Ltd.Daegu 42415South Korea Michigan State University Institute for Quantitative Health Science&EngineeringEast LansingMI 48824United States Department of Orthopedic Surgery Yeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Mesenchymal stem cells(MSCs)are promising candidates for regenerative therapy due to their self-renewal capability,multilineage differentiation potential,and immunomodulatory *** molecular characteristics of MSCs are influenced by their ***,epidural fat(EF)and EF-derived MSCs(EF-MSCs)have garnered attention due to their potential benefits to the spinal microenvironment and their high expression of neural SC ***,their clinical applications are limited due to cell senescence and limited accessibility of *** many studies have attempted to establish an immortalized,stable SC line,the characteristics of immortalized EF-MSCs remain to be *** To establish and analyze stable immortalized *** The phenotypes of EF-MSCs were analyzed using optical *** immortalization was performed using lentiviral *** biomolecular characteristics of the cells were analyzed by immunoblotting,quantitative PCR,and *** The immortalized EF-MSCs demonstrated a significantly extended lifespan compared to the control group,with well-preserved adipogenic potential and SC surface marker *** of human telomerase reverse transcriptase genes markedly increased the lifespan of *** analysis revealed substantial increase in the expression of DNA replication pathway components in immortalized *** Immortalized EF-MSCs exhibited significantly enhanced proliferative capacity,retained adipogenic potential,and upregulated the expression of DNA replication pathway components.

关键词： Immortalization Transfection Stem cell Epidural fat Proteomics

RGB Color-Discriminable Photonic Synapse for Neuromorphic Vision System

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Nano-Micro Letters 2025年第4期17卷 39-62页

作者： Bum Ho Jeong Jaewon lee Miju Ku Jongmin lee Dohyung Kim Seokhyun Ham Kyu-tae lee Young-Beom Kim Hui Joon Park Department of Organic and Nano Engineering&Human-Tech Convergence Program Hanyang UniversitySeoul 04763Korea Department of Semiconductor Engineering Hanyang UniversitySeoul 04763Korea Department of Mechanical Engineering Hanyang UniversitySeoul 04763Korea Department of Physics Inha UniversityIncheon 22212Korea

To emulate the functionality of the human retina and achieve a neuromorphic visual system,the development of a photonic synapse capable of multispectral color discrimination is of paramount ***,attaining robust color discrimination across a wide intensity range,even irrespective of medium limitations in the channel layer,poses a significant ***,we propose an approach that can bestow the color-discriminating synaptic functionality upon a three-terminal transistor flash memory even with enhanced discriminating *** incorporating the strong induced dipole moment effect at the excitation,modulated by the wavelength of the incident light,into the floating gate,we achieve outstanding RGB color-discriminating synaptic functionality within a remarkable intensity range spanning from 0.05 to 40 mW cm^(-2).This approach is not restricted to a specific medium in the channel layer,thereby enhancing its *** effectiveness of this color-discriminating synaptic functionality is demonstrated through visual pre-processing of a photonic synapse array,involving the differentiation of RGB channels and the enhancement of image contrast with noise ***,a convolutional neural network can achieve an impressive inference accuracy of over 94%for Canadian-Institute-For-Advanced-Research-10 colorful image recognition task after the *** proposed approach offers a promising solution for achieving robust and versatile RGB color discrimination in photonic synapses,enabling significant advancements in artificial visual systems.

关键词： Organic field-effect transistor Photonic synapse Excited-state dipole moment RGB color discrimination Neuromorphic visual system