A5101440624- Electric Motor Design and Analysis
- Radio Frequency Integrated Circuit Design
- Magnetic Bearings and Levitation Dynamics
- Tribology and Lubrication Engineering
- Metallurgy and Material Forming
- Hydraulic and Pneumatic Systems
- Refrigeration and Air Conditioning Technologies
- Metal Forming Simulation Techniques
- Biofuel production and bioconversion
- Seismic Imaging and Inversion Techniques
- Analog and Mixed-Signal Circuit Design
- Magnetic Properties and Applications
- Drilling and Well Engineering
- Mechanical Engineering and Vibrations Research
- Enzyme Production and Characterization
- Microwave Engineering and Waveguides
- Brake Systems and Friction Analysis
- Rock Mechanics and Modeling
- Wireless Body Area Networks
- Hydraulic Fracturing and Reservoir Analysis
- Fatigue and fracture mechanics
- Innovative Energy Harvesting Technologies
- Advanced Power Amplifier Design
- Titanium Alloys Microstructure and Properties
- Vibration and Dynamic Analysis
Samsung (South Korea)
2020-2024
Kangwon National University
2017-2020
TGS (United Kingdom)
2016
Pusan National University
2000-2011
Korea Maritime and Ocean University
2011
Kookmin University
2010
Korea Advanced Institute of Science and Technology
2002-2004
The permanent magnet motor is often the most important element in many precision rotor applications and also a frequent source of vibration acoustic noise. eccentricity between stator inevitably introduced during manufacturing process, such as mass unbalance, shaft bow bearing tolerances. This paper investigates radial force density magnetic unbalanced for IPM SPM motors when exists. For field analysis, finite method used to account saturation eccentricity. are analyzed by Maxwell stress...
Vibration of a rotor-bearing system driven by an electric motor is coupled phenomena between mechanical characteristics and magnetic origins through the airgap. With advent new high energy material together with precision applications, sources vibration are becoming more serious. This paper investigates transient whirl responses rotor purely compares it that magnetically origins. The results show significantly affect rotor-motor system.
In this letter, a CMOS tunable channel-selection low-noise amplifier (LNA) employing high-${Q}$ RF band-pass (BP)/band-rejection (BR) filter is proposed for highly integrated front-ends in cellular applications. The LNA implements BP/BR characteristic based on four-path theory from baseband polyphase and low-pass filter. It also provides high rejection ratio close-in transmitter leakage signal out-of-band blockers. Therefore, it compensates the limited filtering performance of duplexer...
The permanent magnet motor is often the most important element in high performance rotor applications and also a frequent source of vibration acoustic noise. Because manufacturing imprecision such as mass unbalance, shaft bow bearing tolerances, eccentricity extensively exists all kinds electric machines. This paper investigates magnetic unbalanced forces for IPM SPM motors which are widely used washing machine due to average torque dynamic responses system when exists. For field analysis,...
Full-waveform inversion (FWI) is an attractive tool for high-resolution velocity-model building without a high-frequency assumption compared to conventional reflection tomography. However, there are two main challenges the application of FWI on narrow-azimuth acquisition (NAZ) data: cycle skipping and footprints. Here, multistage proposed build model NAZ data. It well known that may suffer from cycle-skipping problem when starting not close enough true solution. To mitigate this problem, we...
This paper presents a CMOS RF-to-DC converter with tunable impedance matching network to widely harvest RF energy of 3G/4G cellular low-band frequency range. The proposed consists the differential-drive cross-coupled rectifier and 4-bit capacitor array. is designed using 130nm process. It has peak conversion efficiency 72.25%, 64.97 %, 66.28 % at 700 MHz, 800 900 MHz load resistance 10kΩ, respectively.
Summary In this paper, a new procedure for predicting the crack propagation and fracture behavior in quasi‐brittle materials is presented based on continuum damage mechanics. Several tracking algorithms are widely used failure analysis, among which local algorithm very simple easy to implement with low computational cost. However, prediction of growth traditional algorithm, it can be often seen that sharp changes path such as U‐turns occur. An improved self‐correction ability proposed...
The compression force of refrigerant gas, the viscous and inertial piston, centrifugal balancer weight induce rotating whirl crankshaft in a small reciprocating compressor. It is necessary to develop an analytical model for accurate prediction dynamic behavior compressor mechanism having coupled characteristics between piston crankshaft. dynamically modeled by considering frictional variation contact length piston-cylinder system, then numerical analysis performed For predictions lubrication...
A dual-band CMOS duplexer employing a switchable autotransformer is proposed for highly integrated RF front ends in mobile phones. Because on-chip switches are used to change the length of autotransformer, inductance sized two different frequency ranges. It designed support both low-band (LB) mode from 0.7 0.9 GHz and mid-band (MB) 1.7 2.0 cellular applications. With inductances LB MB modes, transmitter (TX)-to-receiver (RX) isolation achieved by using separate balance networks MB. The...
Guy Hilburn, Yang He, Francis Sherrill, Taejong Kim and Zengjia Yan present a highresolution tomography method which flattens gathers reliably quickly, while yielding geologically plausible velocity models. Traditional methods of updating models by seismic rely on number assumptions simplifications. In many situations, these may either increase the amount time or tomographic iterations required to flatten events in migration gathers, even make worse. other cases, obtained with techniques...
Summary In this paper, a low‐power low‐noise complementary metal‐oxide semiconductor (CMOS) receiver RF front‐end (RFFE) that employs current‐reuse Q ‐boosted resistive feedback amplifier (RFLNA) is proposed for 401 to 406 MHz medical device radio‐communication service band IoT applications. By employing series RLC input matching network, the RFLNA has advantages of both conventional and inductively degenerated common‐source LNA without using large on‐chip spiral inductors at sources main...
본 연구에서는 Schizophyllum commune의 당 분해효소 생산을 위한 최적 배양 조건과 목질바이오매스에 대한 당화 특성에 대하여 연구하였다. S. commune 균체 외 효소에는 endo-<TEX>${\beta}$</TEX>-1,4-glucanase (EG), cellobiohydrolase (CBH), <TEX>${\beta}$</TEX>-glucosidase (BGL)와 같은 cellulase와 <TEX>${\beta}$</TEX>-1,4-xylosidase (BXL)이 함유되어 있고 그 중에서 EG 및 BGL활성이 비교적 높은 활성을 나타낸 것으로 밝혀졌다. commune에서 생산된 EG, BGL, CBH의 온도는 <TEX>$50^{\circ}C$</TEX>이었으나, 열안정성을 가지는 온도범위는 <TEX>$30{\sim}40^{\circ}C$</TEX>였다. 그리고 pH는 5.5이었으며 열 안정성을 나타내는 온도범위에서의 적정 동일한 pH 5.5이었다....
During the last 5 years, maritime safety navigation with IT has been a big issue. After International Maritime Organization defines e-Navigation strategy, various information on board can be integrated by their needs and aims. Especially, on-board monitoring might use single display under consideration of user convenience. To do this, this paper suggests interface design guideline based definition analysis integration requirements existing commercial product.
In this study, effect of carbon source on the hydrolytic ability enzyme from Fomitopsis pinicola, a brown rot fungi, for lignocellulosic biomass were examined two biomasses (rice straw and wood) without any pretreatment. Cellulase activities crude F. which was cultured softwood mixture as source, 19.10 U/ endo--1,4-gulcanase (EG), 36.1 -glucosidase (BGL), 7.27 cellobiohydrolase (CBH), 7.12 -1,4 xylosidase (BXL). Softwood in pinicola comparatively enhanced cellulase than rice straw. The...
With the rapid development of world aviation industry, demand for aeronautical titanium alloys is increasing day by day. A stable and alloy market has been formed. Based on analysis industrialization status quo in United States, Russia, Japan China, problems industry China are put forward. In order to solve these problems, it suggested develop advanced processing technologies, adjust industrial structure further improve material standards alloys.
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...
The numerical method of analysis plays a key role in simulation sheet metal forming processes for design innovation through virtual manufacturing. Recently, important advances research and development the have been made by many scientists engineers. This paper covers general issues but deals with most challenging subjects including finite element (FE) techniques, springback, hydroforming process design. Furthermore, results proposed benchmark problems NUMISHEET 2002 both experiments will be...
In this paper, a low power 2.4 GHz quadrature local oscillator (LO) buffer for Bluetooth energy applications is proposed. A proposed LO employs the transconductor-type IQ generator with gain/phase mismatch compensator and generates accurate signals at frequency parasitic capacitances. The can minimize consumption of path because block generating such as divider-by-2, poly-phase filter, VCO be removed from path. prototype realized in CMOS 65 nm process. achieves simulated voltage gain 6.5 dB...