A5101839916- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Semiconductor materials and devices
- Low-power high-performance VLSI design
- Digital Filter Design and Implementation
- Advanced Wireless Communication Techniques
- Analog and Mixed-Signal Circuit Design
- Advanced Neural Network Applications
- Magnetic properties of thin films
- Education and Learning Interventions
- VLSI and Analog Circuit Testing
- Advancements in Semiconductor Devices and Circuit Design
- Neural Networks and Reservoir Computing
- Neuroscience and Neural Engineering
- Radio Frequency Integrated Circuit Design
- Error Correcting Code Techniques
- Numerical Methods and Algorithms
- CCD and CMOS Imaging Sensors
- Coding theory and cryptography
- VLSI and FPGA Design Techniques
- Cryptographic Implementations and Security
- Advancements in PLL and VCO Technologies
- Neural dynamics and brain function
- Wireless Communication Networks Research
- Radiation Effects in Electronics
Korea University
2016-2025
SK Group (United States)
2025
Samsung (South Korea)
2005-2023
Chonnam National University
2012-2021
Gachon University
2021
Korea University Medical Center
2018-2020
Seoul National University of Science and Technology
2019
Yeungnam University Medical Center
2005-2018
SK Group (South Korea)
2017
Sungkyunkwan University
2016
In a wireless power transfer (WPT) system via the magnetic resonant coupling, one of most challenging design issues is to maintain reasonable level efficiency (PTE), even when distance between transmitter and receiver changes. When varies, PTE drastically decreases due impedance mismatch resonator that receiver. This paper presents novel serial/parallel capacitor matrix in transmitter, where can be automatically reconfigured track optimum impedance-matching point case varying distances. The...
Local data aggregation is an effective means to save sensor node energy and prolong the lifespan of wireless networks. However, when a network used track moving objects, task local in presents new set challenges, such as necessity estimate, usually real time, constantly changing state target based on information acquired by nodes at different time instants. To address these issues, we propose distributed object tracking system which employs cluster-based Kalman filter cameras. When detected,...
Sensory adaptation is an essential part of biological neural systems for sustaining human life. Using the light-induced halide phase segregation CsPb(Br1-xIx)3 perovskite, we introduce neuromorphic phototransistors that emulate sensory adaptation. The phototransistor based on a hybrid structure perovskite and transition-metal dichalcogenide (TMD) emulates in response to continuous light stimulus, similar system. underlying mechanism mixed perovskites. separation under visible-light...
Increasing demands on high-data-rate and low-latency cellular communications are accelerating the developments of millimeter-wave (mm-wave) systems for 5G NR in 28 39GHz bands. In order to provide communication worldwide, high-performance low-cost RF chipset solutions required. Recently, mm-wave CMOS/BiCMOS phased-array transceivers 28GHz band have been reported [1]–[5]. However, there very limited reports [6], which is one main frequency bands US, Canada, China other countries. this paper,...
Abstract With an increasing demand for artificial intelligence, the emulation of human brain in neuromorphic computing has led to extraordinary result not only simulating synaptic dynamics but also reducing complex circuitry systems and algorithms. In this work, electronic device based on a synthesized MoS 2 memristor array (4 × 4) is demonstrated; can emulate behavior with simulation deep neural network (DNN) learning. film directly onto patterned bottom electrode (Pt) high crystallinity...
Spin-orbit coupling effect in structures with broken inversion symmetry, known as the Rashba effect, facilitates spin-orbit torques (SOTs) heavy metal/ferromagnet/oxide structures, along spin Hall effect. Electric-field control of is established for semiconductor interfaces, but it challenging involving metals owing to screening Here, we report that Pt/Co/AlOx laterally modulated by electric voltages, generating out-of-plane SOTs. This enables field-free switching perpendicular magnetization...
A wavelet Electrocardiogram (ECG) detector for low-power implantable cardiac pacemakers is presented in this paper. The proposed wavelet-based ECG consists of a decomposer with filter banks, QRS complex hypothesis testing wavelet-demodulated signals, and noise zero-crossing points. In order to achieve high detection accuracy low power consumption, multi-scaled product algorithm soft-threshold are efficiently exploited our implementation. Our algorithmic architectural level approaches have...
This paper presents ultrathin and highly sensitive input/output devices consisting of a capacitive touch sensor (Cap-TSP) integrated on thin-film-encapsulated active-matrix organic light-emitting diodes (OLEDs). The optimal structure the electrically noise-free sensor, which is assembled OLED (AMOLED) display, obtained by investigating internal electrical field distribution capacitance change based Q3D Extractor model. Electrostatic simulations have verified malfunction-free signals for 4-in...
In this paper, we present an energy-efficient architecture of the Canny edge detector for advanced mobile vision applications. Three key techniques reducing computational complexity are presented. First, by exploiting rank characteristic convolution kernel Gaussian smoothing and Sobel gradient filters, common computations identified shared in image filter design to reduce number additions multiplications. For magnitude/direction computation, only three directions neighboring pixels...
Magnetic random-access memory (MRAM), which stores information through control of the magnetization direction, offers promising features as a viable nonvolatile alternative, including high endurance and successful large-scale commercialization. Recently, MRAM applications have extended beyond traditional memories, finding utility in emerging computing architectures such in-memory probabilistic bits. In this work, we report highly reliable MRAM-based security devices, known physical...
This paper presents a programmable digital finite-impulse response (FIR) filter for high-performance and low-power applications. The architecture is based on computation sharing multiplier (CSHM) which specifically targets re-use in vector-scalar products can be effectively used the low-complexity FIR design. Efficient circuit-level techniques, namely new carry-select adder conditional capture flip-flop (CCFF), are also to further improve power performance. A 10-tap was implemented...
The development status of Ovonic Unified Memory (OUM), a phase-change non-volatile semiconductor memory technology for VLSI stand-alone and embedded applications, is discussed. Using 0.18 μm 3 V CMOS, cells from 5F/sup 2/ to 8F/sup are built in charge-pump-free 4 Mb vehicle. Direct overwrite, 10 ns reset times, 50 set 1.0×10/sup 12/ cycling achieved. At en-year data retention projected at 120°C.
This paper presents a dynamic bit-width adaptation scheme for applications using discrete cosine transform (DCT). The technique can efficiently trade off image quality and computation energy. Based on sensitivity differences of 64 DCT coefficients, separate operand bit-widths are used different frequency components to reduce To select the appropriate that achieve significant reduction power consumption with minimum degradation, we also propose selection algorithm. proposed variable bit...
The dependency of CMOS current reference on supply voltage and temperature is compensated by simply subtracting two outputs with the same dependencies temperature. With this compensation scheme, a self-biased has been implemented in 0.25 µm standard technology. provides 10.45 µA output current, while are 1700 ppm/V 720 ppm/°C, respectively. occupies only 0.002 mm2 active area can operate down to 1.1 V.
Abstract Type I collagen (COL I) is the predominant in extracellular matrix of periodontal ligament (PDL), and its expression PDL fibroblasts (PLF) sensitive to mechanical force. However, mechanism by which PLF induces COL respond force unclear. This study examined nature human mediating response centrifugal Signal transduction pathways early stages mechanotransduction involved force‐driven regulation were also investigated. Centrifugal up‐regulated without cytotoxicity activated...
In low-voltage operation, static random-access memory (SRAM) bit-cells suffer from large failure probabilities with technology scaling. With the increasing failures, conventional SRAM is still designed without considering importance differences found among data stored in bit-cells. This paper presents a heterogeneous sizing approach for embedded of H.264 video processor, where more important higher order bits are relatively larger and less smaller ones. As result, significantly decrease...
This paper presents a half-select free 9T SRAM to facilitate reliable operation in the near-threshold voltage region. In proposed SRAM, disturbance, which results instable operations 6T cell, can be completely eliminated by adopting cross-access selection of row and column word-lines. To minimize area overhead bit-line access transistors between adjacent cells are shared using symmetric node that connects two cells. addition, selective pre-charge scheme considering preferably isolated...
This paper presents 6T SRAM cell-based bit-parallel in-memory computing (IMC) architecture to support various computations with reconfigurable bit-precision. In the proposed technique, bit-line computation is performed a short WL followed by BL boosting circuits, which can reduce delays. By per-forming carry-propagation between each near-memory circuit, complex are also enabled iterating operations low latency. addition, bit-precision supported based on size. Our 128KB in/near memory has...
Optically transparent and mechanically flexible thin-film transistors have recently attracted attention for next generation display technologies. Driving switching displays challenging requirements such as high optical transparency, large-scale integration, suitable drive current (Ion) in the microampere range, on/off ratio (Ion/Ioff), field-effect mobility, uniform threshold voltage (Vth). In this study, we demonstrate fully high-performance high-yield based on random growth of a...
Recent efforts to increase the energy transfer efficiency in magnetic resonant coupling-based wireless power (WPT) systems, have been focused on improving quality factor, precision of impedance matching, and position alignment between resonators. Although those approaches are effective efficiencies, transferred can easily be wasted due leakage flux nondirectional fields. In this paper, we present a novel field shaping technology for near-field WPT system. study, beamforming techniques that...
With inherent algorithmic error resilience of deep neural networks (DNNs), supply voltage scaling could be a promising technique for energy efficient DNN accelerator design. In this paper, we propose novel resilient techniques to enable aggressive by exploiting different amount (sensitivity) with respect layers, filters, and channels. First, rapidly evaluate filter/channel-level weight sensitivities large scale DNNs, first-order Taylor expansion is used, which accurately approximates...
New methods based on nonlinear theory have been developed to give more insight into complex heart rate (HR) dynamics. This study was designed test the hypothesis that altered HR dynamics, as analyzed with complexity and fractal measures, may precede spontaneous onset of paroxysmal atrial fibrillation (PAF). Secondly, difference in temporal change these measurements between different types (AF) assessed.From 105 Holter tapes which PAF recorded, 44 (>or=5 min) episodes 33 patients (22 men, 58...
This paper presents an architectural approach to the design of low power reconfigurable finite impulse response (FIR) filter. The is well suited when filter order fixed and not changed for particular applications, efficient trade-off between savings performance can be made using proposed architecture. Generally, FIR has large amplitude variations in input data coefficients. Considering both coefficients inputs, dynamically changes order. Mathematical analysis on degradation its experimental...