A5101824074- Gas Sensing Nanomaterials and Sensors
- Physics of Superconductivity and Magnetism
- Topic Modeling
- Analytical Chemistry and Sensors
- Advancements in PLL and VCO Technologies
- Radio Frequency Integrated Circuit Design
- Semiconductor materials and devices
- Nuclear reactor physics and engineering
- Nuclear Engineering Thermal-Hydraulics
- Natural Language Processing Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Superconducting Materials and Applications
- Autonomous Vehicle Technology and Safety
- Analog and Mixed-Signal Circuit Design
- Advanced Numerical Analysis Techniques
- Electromagnetic Compatibility and Noise Suppression
- Advanced Chemical Sensor Technologies
- Topology Optimization in Engineering
- Advanced Text Analysis Techniques
- Antenna Design and Analysis
- Text and Document Classification Technologies
- Sentiment Analysis and Opinion Mining
- Robotics and Sensor-Based Localization
- Microwave Engineering and Waveguides
- Advanced Memory and Neural Computing
Pusan National University
1996-2025
Samsung (South Korea)
2014-2024
Korea Advanced Institute of Science and Technology
2004-2024
Korea Atomic Energy Research Institute
2004-2023
Hyundai Motors (South Korea)
2021-2023
Ulsan National Institute of Science and Technology
2018-2021
Dongguk University
2021
Dong-A University
2020
LSIS (South Korea)
2008-2019
Seoul National University
2001-2018
The effects of surface treatment combining corona discharge and hydrogen peroxide (H2O2) on the electrochemical performance carbon felt electrodes for vanadium redox flow batteries (VRFBs) have been thoroughly investigated. A high concentration oxygen functional groups has successfully introduced onto by a specially designed treatment, which is mainly responsible improving energy efficiency VRFBs. In addition, wettability also can be significantly improved. VRFB cell employing modified...
In recent years, research concerning autonomous driving has gained momentum to enhance road safety and traffic efficiency. Relevant concepts are being applied the fields of perception, planning, control automated vehicles leverage advantages offered by vehicle-to-everything (V2X) communication technology. This paper presents a V2X communication-aided system for vehicles. It is comprised three subsystems: beyond line-of-sight (BLOS) extended control. Specifically, BLOS perception subsystem...
According to the trend towards high-resolution CMOS image sensors, pixel sizes are continuously shrinking, and below 1.0μm, now reaching a technological limit meet required SNR performance [1-2]. at low-light conditions, which is key metric, determined by sensitivity crosstalk in pixels. To improve sensitivity, technology has migrated from frontside illumination (FSI) backside illumiation (BSI) as size shrinks down. In BSI technology, it very difficult further increase of near-1.0μm because...
Liquid jet spray cleaning has recently emerged as a promising method for removing nanoparticle contaminants from Si wafers in the semiconductor industry. However, its environmental benefits not using chemicals are fully realized due to limitations size of removable particles and insufficient removal efficiency smaller particles. In this study, we aimed overcome technical limitations. We developed Monte Carlo model that connects existing single droplet-based models multiple droplet impacts...
This paper describes a dual-loop delay-locked loop (DLL) which overcomes the problem of limited delay range by using multiple voltage-controlled lines (VCDLs). A reference generates quadrature clocks, are then delayed with controllable amounts four VCDLs and multiplexed to generate output clock in main loop. architecture enables DLL emulate infinite-length VCDL finite-length VCDLs. The incorporates replica biasing circuit for low-jitter characteristics duty cycle corrector immune prevalent...
This paper presents a full-CMOS transmitter and receiver for 2.0-GHz wide-band code division multiple access with direct conversion mixers DC-offset cancellation scheme. The scheme combined multiphase sampling fractional-N prescaler alleviates the problems of receiver. Digital gain control is merged into baseband filters variable-gain amplifiers to optimize linearity system, reduce noise, improve sensitivity. Variable-gain loop eliminate in each stage. chip implemented 0.35-μm CMOS...
Millions of posts are being generated in real-time by users social networking services, such as Twitter. However, a considerable number those mundane that interest to the authors and possibly their friends only. This paper investigates problem automatically discovering valuable may be potential wider audience. Specifically, we model structure Twitter graph consisting nodes retweet relations between edges. We propose variant HITS algorithm for producing static ranking posts. Experimental...
A nonaqueous redox-flow battery employing [Co(bpy)3](+/2+) and [Fe(bpy)3](2+/3+) redox couples is proposed for use in large-scale energy-storage applications. We successfully demonstrate a with practical operating voltage of over 2.1 V an energy efficiency 85% through rational cell design. By utilizing carbon-coated Ni-FeCrAl Cu metal foam electrodes, the electrochemical reactivity stability can be considerably enhanced. Our approach intoduces more efficient conversion chemical into...
A physical unclonable function (PUF) device using a nano-electromechanical (NEM) switch was demonstrated. The most important feature of the NEM-switch-based PUF is its use stiction. Stiction one chronic problems associated with micro- and system (MEMS/NEMS) devices; however, here, it utilized to intentionally implement for hardware-based security. stiction caused by capillary van der Waals forces, producing strong adhesion, which can be design highly robust stable PUF. probability that will...
This paper presents an energy-efficient intelligent multisensor system for hazardous gases, whose performance can be adaptively optimized through a multimode structure and learning-based pattern recognition algorithm. The operation provides control capability on the tradeoff relationship between accuracy power consumption. In-house microelectro-mechanical (MEMS) devices, with suspended nanowire structure, are manufactured to provide desired characteristics of small size, low power, high...
Driving at an unsignalized intersection is a complex traffic scenario that requires both safety and efficiency. At the intersection, driving policy does not simply maintain safe distance for all vehicles. Instead, it pays more attention to vehicles potentially have conflicts with ego vehicle, while guessing intentions of other In this paper, we propose attention-based handling unprotected intersections using deep reinforcement learning. By leveraging attention, our learns focus on spatially...
The high-speed impact of liquid microdroplets has emerged as a promising method to eliminate nanoparticle contaminants from semiconductor wafer surfaces. However, existing experimental studies have primarily focused on evaluating their own nozzles for removing particles larger than 50 nm, which does not align with the current research roadmap where target particles' size decreases down sub-10 nm. As it is more challenging remove smaller particles, there strong need better understand...
The hot-carrier degradation of the junctionless mode (JM) and inversion (IM) five-story vertically integrated gate-all-around (GAA) MOSFETs is investigated for first time. It found that drain current induced by injection (HCI) in JM-FET less than IM-FET same dimensions bias conditions, because bulk conduction mechanism JM-FET, which contrast to surface IM-FET. results are obtained using electrical measurements numerical simulations. analysis how HCI affects lifetime reliability GAA great...
A single-chip direct-conversion CMOS receiver for 2.4-GHz wide-band code-division multiple-access wireless local loop (WLL) is described. The chip includes a low noise amplifier, 12-phase downconverter, variable gain g/sub m/-C channel selection filter, programmable phase-locked seven frequencies, and 4-bit flash analog-to-digital converter. proposed multiphase reduced frequency conversion scheme combined with sampling fractional-N prescaler, cascaded dc-offset canceler distributed automatic...
This paper proposes the multi-material topology optimization for simultaneous design of segmented permanent magnet (PM) arrays, coil, and iron materials in magnetic actuators. Specifically, proposed approach can find optimal layout shape PM, materials, as well border magnetization direction PM arrays. For designing actuator components, discrete material optimization-type interpolation scheme is employed this paper. To attain an orientation variable Cartesian coordinate utilized with...
A 0.8 μm-pitch 64 megapixels ultrahigh-resolution CMOS image sensor has been demonstrated for mobile applications the first time. Full-well capacity (FWC) of 6k e- was achieved in μm pixels as best world, and advanced color filter (CF) isolation technology introduced to overcome sensitivity degradation. Dual conversion gain (CG) also applied improve FWC performance Tetracell up 12k e-. In addition, highly refined deep trench (DTI) photodiode design significantly improved dark noise characteristics.
Resolving edge-cases in autonomous driving, head-to-head racing is getting a lot of attention from the industry and academia. In this study, we propose game-theoretic model predictive control (MPC) approach for data-driven identification method. For practical estimation nonlinear parameters, adopted hyperband algorithm, which used neural training machine learning. The proposed controller comprises three modules: 1) game-based opponents' trajectory predictor, 2) high-level race strategy...
Auto tuning niching genetic algorithm was used to design optimal HTS magnets for the 600 kJ class SMES system under several constraint conditions. Constraint conditions were operation loss of magnet (less than 2 W), inductance 24 H), number double pancake coils (about 10 DPCs), turns DPC 300 turns), outer diameter (close 800 mm) and total length wire in a 500 m). As result optimum design, we obtained parameters according two operating currents, 360 A 370 A. However, even though designed...
In this letter, an electrically small mu-negative (MNG) zeroth-order resonance (ZOR) antenna with multilayered conductor is presented. To improve the radiation efficiency, structure of MNG ZOR determined to increase resistance by reducing current cancellation between strip antenna. particular, employed enhance efficiency ohmic loss. The using (kr = 0.182) has a measured 3-dB fractional bandwidth 0.846% and 18.66%.
Electric vehicles (EVs) offer benefits in terms of reducing emissions and saving energy over other conventional vehicles. There have been various studies on EVs for efficiency driving performance improvement. As an area EV systems, dual-motor systems with planetary gear trains studied fuel improvement, but they limitations torque vectoring maximum compared to typical systems. To overcome these limitations, a novel system train has suggested eco dynamic modes. The achieves variable motor...