A5100330714- Advancements in Photolithography Techniques
- Indoor and Outdoor Localization Technologies
- Energy Efficient Wireless Sensor Networks
- Underwater Vehicles and Communication Systems
- Radio Frequency Integrated Circuit Design
- Integrated Circuits and Semiconductor Failure Analysis
- IPv6, Mobility, Handover, Networks, Security
- VLSI and Analog Circuit Testing
- Advanced Authentication Protocols Security
- Semiconductor materials and devices
- Advanced Power Amplifier Design
- Advanced Photonic Communication Systems
- Magnetic Bearings and Levitation Dynamics
- Autonomous Vehicle Technology and Safety
- Electrostatic Discharge in Electronics
- Network Security and Intrusion Detection
- Electromagnetic Compatibility and Noise Suppression
- Telecommunications and Broadcasting Technologies
- Spam and Phishing Detection
- 3D IC and TSV technologies
- Advanced Wireless Network Optimization
- Vehicular Ad Hoc Networks (VANETs)
- Electric Motor Design and Analysis
- Wireless Communication Networks Research
- Optical Network Technologies
Samsung (South Korea)
2007-2024
Korea University
2022-2024
SK Group (South Korea)
2021-2023
Electronics and Telecommunications Research Institute
2005-2020
Georgia Institute of Technology
2016
Pohang University of Science and Technology
2012-2014
Yonsei University
2013
Gwangju Institute of Science and Technology
2007-2012
Jeonbuk National University
2012
Changwon National University
2006
This paper presents a method to calculate motor parameters considering magnetic nonlinearity in interior permanent magnet synchronous motors (IPMSM). To analyze characteristics by using equivalent circuits, inductance and iron loss resistance, which are affected critically saturation, obtained static finite-element analysis. For fabricated IPMSM, input current such as torque efficiency calculated, the proposed is verified comparison of calculated experimental results
Localization schemes using a mobile beacon have similar effects as the use of many static beacons in terms improving localization accuracy. Specifically, scheme with proposed by Ssu et al. has finegrained accuracy, scalability, and power efficiency without requiring measured distance or angle information. However, this often large location errors ill-conditioned cases. To improve accuracy Ssu's scheme, letter proposes that estimates sensor from possible areas geometric constraints. During...
Controller Area Network (CAN) is an essential networking protocol that connects multiple electronic control units (ECUs) in a vehicle.However, CAN-based in-vehicle networks (IVNs) face security risks owing to the CAN mechanisms.An adversary can sabotage vehicle by leveraging if they access bus.Thus, recent actions and cybersecurity regulations (e.g., UNR 155) require carmakers implement intrusion detection systems (IDSs) their vehicles.The IDS should detect cyberattacks provide additional...
DRAM products have been recently adopted in a wide range of high-performance computing applications: such as cloud computing, big data systems, and loT devices. This demand creates larger memory capacity requirements, thereby requiring aggressive technology node scaling to reduce the cost per bit [1], [2]. However, manufacturers are facing challenges due row hammer refresh retention time beyond 1a-nm Row is failure mechanism, where repeatedly activating disturbs adjacent rows. Scaling down...
This paper reports high-precision motion control at the target position and offline compensation of straightness error occurring during magnetically levitated stage supported by linear magnetic bearing. The bearing is composed electromagnets sensors in same module to enable easy maintenance reduce machining error, conventional quadratic Gaussian adopted for stage. test results show that can compensate precisely, so it expected this be applied applications.
Localization is essential in wireless sensor networks to handle the reporting of events from nodes. For 3-D applications, we propose a mobile beacon-based localization using classical multidimensional scaling (MBL-MDS) by taking full advantage MDS with connectivity and measurements. To further improve location performance, MBL-MDS adopts selection rule choose useful reference points, decision prevent failure case due points placed on same plane. Simulation results show improved performance...
This paper presents a 28GHz 16-element phased-array receiver in 28nm bulk RF CMOS process targeting 5G NR application. The implements high-gain low-NF LNA, linearity enhanced amplifier with post-distortion, and RF/IF step attenuators for wide gain range fine control. Thereby, the presented demonstrated system NF of 3.5dB, control 50dB (1dB step), an EVM - 37.7/-43.1dB 800/100MHz signals while consuming low power 0.54W (equivalent to 33.5mW per channel).
To be competitive in a mobile market, current consumption and bill-of-material (BOM) cost have to minimized. Current reduction techniques been actively investigated as they become key factor increase battery lifetime. reduce BOM cost, external low-noise amplifier (eLNA) usage discrete passive components minimized with simple interfaces, which influences the number of PCB Iayers stacks. This work is oriented provide low-power low-cost cellular RF transceiver that supports 2G, 3G, 4G well...
The analytical method of images using magnetic charge is applied to analyze characteristics the slotless axial-flux type brushless dc motors in this paper. theory introduced and flux density distribution calculated verified by three-dimensional finite element analysis. Then, between single dual gap motor are analyzed compared
A new control chart is developed by using the exponentially weighted moving average (EWMA) statistics and a multiple testing procedure for controlling false discovery rate. The considers not only current EWMA statistic, but also given number of previous at same time. Numerical simulations are accomplished to evaluate performance proposed in terms run length conditional expected delay. results compared with those existing charts including X-bar chart, EWMA, cumulative sum charts. Case studies...
Distance-bounding protocols enable the establishment of an upper bound on distance between two communicating parties in such a way that their degree proximity can be verified. Most these rely multi-rounds single-bit challenge and response. Therefore, each round, probability adversary will guess correct response is 1/2. This letter proposes new method to increase number states distance-bounding by injecting intentional delays round. Our reduce from 1/2 1/(2k) for where k different delays,...
This paper presents a 39 GHz 2×16-channel phased-array transceiver IC with compact, high-efficiency Doherty power amplifiers. The was implemented using 28-nm bulk CMOS process flip-chip packaging and evaluated 100 MHz 8-carrier component (CC) fifth-generation (5G) new radio (NR) signal (total 800 MHz). With single transformer-based compact amplifiers in transmitter (TX) path, the phased array shows excellent TX performance, achieving high average output of >8 / >9.3 dBm/ch. at...
This article investigates the advantages and disadvantages of cell search for LTE NR. investigation enables us to design a couple synchronization signals specified in frequency domain whole search. For time/frequency partial identification, achieve both low complexity robustness against very high carrier offset (CFO) time-varying fading, we propose primary signal generated by centrally symmetric concatenation Zadoff-Chu sequence its modified sequence. Also, final minimize intercell...
A beamforming phased-array has become an indispensable configuration in 5 G new-radio (NR) frequency-range-2 (FR2) cellular communications to boost equivalent isotropic radiated power. In order miniaturize the phased array with high output power, a transceiver IC should be highly integrated multiple channels. Silicon-based power amplifiers (PAs) have been widely used increase degree of integration ICS; however, they still suffer from low added efficiencies at average ($\mathrm{PAE}_{\text...
This paper presents a novel 4F <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> DRAM cell transistor for future DRAM. Whereas traditional vertical channel (VCT) were based on gate-all-around (GAA) structure, the self-aligned in 2-pitch array (S2CAT) this work uses back-gate (BG) shared by two neighboring bit cells. A voltage biased to BG controls threshold (V <inf xmlns:xlink="http://www.w3.org/1999/xlink">T</inf> ), which is used...
Tighter CD control requirements of the smaller devices in modern semiconductor products demand all potential sources change imaging characteristics. Bandwidth ArF lasers is known to be one important parameters controlled improve wafers. changes Device Critical Patterns for memory products, example spacing DRAM isolation patterns, due laser bandwidth were investigated through simulations. The purpose simulation study was find out if there are optimum combinations layout and illumination...
Range-free localization schemes are much promising in wireless sensor networks because they can estimate the location of a node without power-consuming and expensive devices for measuring distance or angle information. Among range-free schemes, multi-hop localize nodes with few beacon through connection between nodes. Since accuracy depends largely on communication range should be determined considering relationship accuracy. In this paper, we propose selection method DV-Hop scheme, typical...
In underwater sensor networks, localization is one of the most important issues because nodes are considerably difficult to be deployed at determined locations. Localization schemes using a mobile beacon have fine-grained accuracy can replace lot static beacons. with beacon, movement determines deployment beacons used for and influences accuracy. To improve study on path necessary. this paper, we propose by considering Simulation results show that provides higher than random other paths.
Recently, photolithography process is facing many difficulties in patterning the circuit adequately, mainly due to rapid decrease of k1 factor. The limitation numerical aperture (NA) causes distortion printed patterns, such as corner rounding, line end shortening, and different bias between isolated dense figures. optical proximity effect correction (OPC) most popular method solve this problem. Especially, we should apply model-based OPC critical layers patterns get smaller more complex....
As mobile applications have become more prevalent, the demand for higher network capacity and data rates has increased. This led to development of complicated platforms including RF transceivers that can support various frequency bands, a massive multiple-input multiple-output (MIMO), multiple carrier components (CCs) aggregations (CAs). paper presents fully integrated, versatile transceiver designed handle high achieve cost-efficient solution, incorporating techniques. The comprises 24...
We propose a real-time traffic simulation for autonomous vehicles with V2V communications. In order to execute simulation, imitated generic signals are developed as component of the simulator, which is similar ones in real world. addition, vehicle driving module supported by communication integrated into simulator. Then, we generate robust numbers software conduct experiments. The results can be shown 3D rendering ongoing status surrounding vehicles.
Range-free localization schemes could be a good approach to localize sensor nodes from the viewpoint of cost and energy consumption, because range-free require no hardware for measuring distance or angle information. The use mobile beacon can improve accuracy reduce communication overhead between mobility beacon. A 3D scheme with proposed by Ou et al. has fine-grained accuracy, scalability, power efficiency [9]. However, Ou's have large location errors cause failure in ill-conditioned cases....