A5106394757- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Advanced Photonic Communication Systems
- Nuclear Engineering Thermal-Hydraulics
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Analog and Mixed-Signal Circuit Design
- Engineering Applied Research
- Electrical and Bioimpedance Tomography
- Semiconductor Lasers and Optical Devices
- Nuclear Physics and Applications
- Heat transfer and supercritical fluids
- Aerosol Filtration and Electrostatic Precipitation
- Risk and Safety Analysis
- Fluid Dynamics and Heat Transfer
- Refrigeration and Air Conditioning Technologies
- Advanced Fiber Laser Technologies
- Gas Dynamics and Kinetic Theory
- Advanced Optical Imaging Technologies
- Microfluidic and Bio-sensing Technologies
- Interactive and Immersive Displays
- Combustion and Detonation Processes
- Fusion materials and technologies
- Rocket and propulsion systems research
- Computer Graphics and Visualization Techniques
ETH Zurich
2023-2025
Georgia Institute of Technology
2024
Korea Advanced Institute of Science and Technology
2020-2024
Korea Atomic Energy Research Institute
1999-2021
Hanseo University
2009-2019
LG (South Korea)
2004
The rise of data-driven demands calls for terahertz-capable circuits, however, semiconductor devices still face performance limitations above 100 GHz, posing a challenge wireless networks. Electronic metadevice is concept inspired by optical metamaterials, which was first demonstrated in the form switches that could traditional devices. Here we unveil critical aspects this technology and demonstrate three-terminal active metadevices, show promise next generation telecommunication circuits....
SMART100 is a small sized integral type pressurized water reactor (PWR) with rated thermal power of (Chung et al., 2015) 365 MW, which adopts various inherent and passive design features to enhance safety. Most the primary circuit components, such as core, coolant pumps, steam generators, pressurizer are contained in single leak-tight pressure vessel. Due design, large pipes connecting major components removed. Thus, possibility break loss accident (LBLOCA) inherently eliminated natural...
This paper presents an error-tolerant and power-efficient impedance measurement scheme for bioimpedance acquisition. The proposed architecture measures the magnitude real part of target complex impedance, unlike other architectures measuring either real/imaginary components or phase. phase information is obtained by using ratio between components. can allow avoiding direct measurements, which require fast, power-hungry circuit blocks. A reference resistor connected in series with to...
We demonstrate wide-angle beam-steering using an optical phased array (OPA) with waveguide radiators designed non-uniform widths to reduce the crosstalk between waveguides. The OPA consists of a silicon based 1 × 16 electro-optic phase shifters and end-fire radiators. were configured four different half-wavelength spacing, which can remove higher-order diffraction patterns in free space. waveguides showed low −10.2 dB at wavelength 1540 nm. With control, achieved wide over ±80° side-lobe...
Electronic biosensors are transducers that convert biomolecular or cellular information to electronic readouts. Though advances in electronics keep improving biosensors' performance, often their ultimate detection limits and functionalities constrained at the sensor interfaces. For instance, existing electrochemical optical bioanalytical platforms commonly face challenges immobilizing surface bioreceptors detecting ultra-trace biospecimens due slow mass transport limitation from bulk...
A rocket uses fuel and oxidizers to generate propulsion by combustion ejection, is used for space exploration aircrafts, weapons, satellite launches. In particular, the nozzle generating thrust of solid-propellant rockets exposed a high-temperature high-pressure environment with erosion occurring from gas. When occurs on throat such rocket, it has great impact flight performance as reaching distance speed. Many studies have been conducted characterize based thermochemical model, since become...
Fully integrated silicon-based optical phased arrays (OPAs) are promising devices due to their extremely narrow beam, compact size, and low power consumption. Their potential applications include light detection ranging (LiDAR), three-dimensional (3D) imaging, holography wireless communication (WOC) [1]–[6]. These require OPAs have small size efficient interfacing between the electronic photonic circuits (ICs). There been substantial efforts realize with CMOS ICs for LiDAR [2–3, 5]. [2]...
In this paper, we present a new impedance measurement integrated circuit (IC) for achieving wideband coverage up to 10 MHz and low power consumption. A frequency-shift technique is applied down-shift the input frequency, which ranges from 100 kHz MHz, into an intermediate frequency of kHz, while frequency-shifting bypassed when falls in range Hz kHz. It results times relaxation requirement on instrumentation amplifier (IA) bandwidth comparator delay, greatly reducing overall The proposed IC...
This article presents a fully-integrated dielectrophoresis (DEP)-assisted multi-functional CMOS biosensor array chip with 4096 working electrodes (WEs), 12288 photodiodes (PDs), reference (REs), and counter (CEs), while each WE photodiode can be reconfigured to support on-chip DEP actuation, electrochemical potentiostat, optical shadow imaging, complex impedance sensing. The proposed is an example of actuation-assisted label-free for the rapid sensing low-concentration analytes. actuator...
SMART (System-integrated Modular Advanced ReacTor) is an integral-type nuclear reactor for cogeneration that adopts a flow mixing header assembly (FMHA) to maintain uniform temperature distribution in the coolant at core inlet case of failure steam generator or pump. The FMHA important enhancing thermal during transient and even accidents, so it essential thermal-hydraulic characteristics be understood. Scaling analysis was performed design experimental facility test through computational...
In code roll forming processes, the sheet metal strip is gradually and successively bent into a desired profile.Occurrence of buckling one major defects. Buckling may occur due to longitudinal stress it difficult predict behavior. this study an analytical method for behavior during proposed. All numerical simulations are performed by finite element analysis. The can be predicted with simulation modeling method.
We present a 1×16 optical phased array (OPA) in state-of-the-art 45-nm SOI CMOS technology for free-space communication and imaging. Width grating period of the antenna is optimized to have longitudinal radiation angle 10˚ efficiency 35.3 % at an operating wavelength 1310 nm. To reduce insertion loss OPA, thermo-optic phase shifter based on <i>n-i-n </i>junction used. The proposed OPA has been fabricated electronic-photonic process from GlobalFoundries, which intended fabricate both...
This paper presents a wide-dynamic-range, DC-coupled, time-based neural-recording integrated circuit (IC), which is resilient against stimulation artifacts, for bidirectional neural interfaces. The proposed IC based on delta-sigma modulation consists of an input Gm cell, current-controlled oscillator (CCO)-based integrator, phase quantizer, and tri-level current-steering DACs. feedback DACs embedded in the current sources cell enable recording to achieve wide enough dynamic range directly...
The automobile has been changed to an intelligent digital vehicle. Information services provided such a vehicle over wireless communication networks are referred as automotive telematics. In this paper, we describe turn-by-turn navigation system for telematics terminals. Our several unique features embedding its own map, supporting both local calculation of routes and reception calculated at designated center, detour path finding instead recalculating another route the generating maneuvers...
관류식 직관형 증기발생기의 열수력 설계와 성능분석을 위한 해석코드를 개발하였다. 개발한 물리적 모델과 수치 해석 코드를 검증하기 위해 설계 제원이 공개되어 사용되고 있는 증기발생기를 개발된 이용해 해석하고 자료와 비교하였다. 또한 동일한 최적 안전해석코드인 MARS를 이용하여 해석한 뒤 비교분석하였다. 열전달면적, 압력 및 온도분포 등의 계산 결과는 자료 MARS 코드의 결과와 대부분 일치하게 나타났다. 최종적으로 코드가 열적 최적화 민감도 분석을 목적으로 폭넓게 사용될 수 있음을 확인하였다. A thermal-hydraulic design and performance analysis computer code for a once-through steam generator using straight tubes is developed. To benchmark the developed physical models code, an by other designer simulated...