A5085590269- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Adaptive Control of Nonlinear Systems
- Engineering Applied Research
- Teleoperation and Haptic Systems
- Inertial Sensor and Navigation
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- Magnetic Properties and Applications
- Electromagnetic wave absorption materials
- Electromagnetic Launch and Propulsion Technology
- Conducting polymers and applications
- Electric Motor Design and Analysis
- Piezoelectric Actuators and Control
- Radio Frequency Integrated Circuit Design
- Magnetic Field Sensors Techniques
- Magnetic Bearings and Levitation Dynamics
- Antenna Design and Analysis
- Underwater Vehicles and Communication Systems
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Frequency Control in Power Systems
- Pulsed Power Technology Applications
- Aerospace Engineering and Control Systems
Chungbuk National University
1995-2023
Korea Atomic Energy Research Institute
2000-2018
Jeonbuk National University
2016-2017
Chungnam National University
2012-2013
Hanyang University
2002-2007
Pohang University of Science and Technology
2006
Since the successful first plasma generation in middle of 2008, three experimental campaigns were successfully made for KSTAR device, accompanied with a necessary upgrade power supply, heating, wall-conditioning and diagnostic systems. was operated toroidal magnetic field up to 3.6 T circular shaped plasmas current 700 kA pulse length 7 s, have been achieved limited capacity PF magnet supplies. The mission program is achieve steady-state operations high performance relevant ITER future...
Abstract Electromagnetic interference (EMI) shielding materials of complex type conductive polypyrrole (PPy) as an intrinsically conducting polymer and silver‐palladium (AgPd) metal compound coated on woven or non‐woven fabrics are synthesized. From dc conductivity SEM photographs PPy/fabric complexes, we discuss charge transport mechanism the homogeneity coating fabrics. The EMI efficiency AgPd/fabric complexes is in range 8 ∼ 80 dB depending additional Ag vacuum evaporation. highest...
In this paper, a simple design of DOB (Disturbance Observer) for attitude control quad-rotor system is presented. A modified structure from the conventional introduced to eliminate time-delay in calculation. The proposed modification configuration provides an efficiency calculation disturbance term such that delayed not required. performance evaluated through simulation studies. To confirm results, experimental studies are conducted.
A multi-megawatt long pulse ion source (LPIS) was developed for the Korea Superconducting Tokamak Advanced Research (KSTAR) neutral beam (NB) injector. Arc discharge characteristics of were investigated on NB test stand. The consists a magnetic bucket plasma generator with multi-pole cusp fields and set tetrode accelerators circular apertures. inner volume source, including accelerator column, is approximately 150 litres. Design requirements 120 kV/65 A deuterium 300 s length initially an...
This paper proposes a rotary magnetic position sensor (RMPS) which has sinusoidally magnetized permanent magnet (PM) with small number of poles. To make the sinusoidal flux density distribution from PM, magnetizing fixture is designed by adjusting its pole shape. The magnetization process analyzed using Preisach model and two-dimensional finite-element method (FEM). simulation result compared experimental one. Also, ability detection two signals shown
This article presents the design, control, and implementation of a small quad-rotor system under practical limitation being cost effective for private use, such as in cases control education or hobbies involving radio-controlled systems. Several problems associated with implementing had to be taken into account satisfy this constraint. First, size was reduced attain better maneuverability. Second, main hardware limited an 8-bit processor AVR reduce cost. Third, algorithms related sensing...
This paper presents a design of an impedance transformer (IT) with high frequency selectivity characteristics. The can be controlled by even- and odd-mode shunt coupled transmission line (TL). For experimental validation, 50- to <TEX>$20-{\Omega}$</TEX> IT was implemented at center (<TEX>$f_0$</TEX>) 2.6 GHz for the long-term evolution signal. measured results were in good agreement simulations, showing return loss higher than 19 dB over passband bandwidth 0.63 (2.28-2.91 GHz) sharp...
This letter presents the quantitative analysis of a novel reflection type electronic impedance tuner. The proposed tuner consists 3-dB 90° coupler, variable phase shifter, and attenuator. A 180° shifter with constant insertion loss wide variation range low shifting attenuator was used to independently control magnitude Due independent controls magnitude, has programmable characteristic. fabricated shows uniform distribution in polar form deviation less than average 0.24 dB for standing wave...
본 논문에서는 저주파 자기 유도(magnetic induction)를 이용한 무선 전력 전송 시스템을 위한 새로운 다중탭을 갖는 평판형 스파이럴 안테나 구조를 제시한다. 제안된 안테나는 사각 안테나와 같은 기존 상용안테나에 비해 높은 효율을 가지고, 개구면에서 고르게 전력을 전송할 수 있다. 검증을 위해 132kHz 저주파에서 유도를 전송을 송수신 시제품을 제작하였다. 송신 최대한 많은 양을 균일하게 송신할 있도록, 3중 탭을 갖도록 하였다. 수신 수신부의 크기를 소형화하기 위해, 2중 설계하였으며, 단면을 사용한 경우와 직렬로 양면을 두 경우에 대해 설계 측정 결과, 제안한 기존의 안테나보다 <TEX>$3{\sim}10$</TEX> dB 이상 큰 송수신할 있었다. In this paper, a novel planar spiral antenna of multi-tabs is proposed for wireless power transmission system based on...
In this paper, contact force control of a quadrotor system is presented. Due to an expensive cost sensors for localization, camera used locate the system. Using maker on top system, heading direction can be justified. Based position performed in indoor environment. addition, from human operator applied so that feasibility applying flying tested. Experimental studies interaction between and are presented confirm proposed performance.
한국기초과학지원연구원 부산센터에서 개발 중인 28 GHz ECRIS에 대한 마이크로파 패킷의 전파와 흡수에 분석을 제한된 변수 범위 내에서 실시하였다. 자이로트론에서 발생된 마이크로파는 도파관 시스템을 거쳐 자기장 및 플라즈마 캐비티의 축방향으로 입사된다. 축방향 자기장만을 고려한 분석적 Ray Tracying에 의하면 고자기장 영역에서 준 종파로 입사된 전자기 파동의 패킷은 전자 사이클로트론 공명 영역으로 진행함에 따라 바깥 방향에서 안쪽 방향으로 방향을 바꾼다. 따라서 일정 수준의 전자밀도가 유지되면 입사 초기에 발산하던 파동은 공명에 의하여 플라즈마로 흡수되기 전에 전도체인 캐비티 벽에 충돌할 가능성이 크지 않음을 확인하였다. 또한 플라즈마로의 흡수율이 매우 크므로 인출부 벽에서 반사될 가능성도 않다. Packet propagation and absorption for the superconducting ECRIS under developing by KBSI Pusan...
This paper presents the localization of a quad-rotor system using camera for indoor application. To localize with camera, several practical issues are addressed. Firstly, radially distorted images by convex lens should be corrected. Secondly, markers used to detect position and heading angle system. Lastly, respect different heights calibrated. Experimental studies confirm based on vision
Summary form only given. Analog phase shifters are widely used in radar systems and communication to achieve linear control. To obtain control 1-port network, a shifter is required constant return loss variation. Normally the shifting characteristic be obtained by variation of junction capacitance varactor diode. The core circuit proposed reflection type (RTPS) consists single diode λ/4 transmission line terminated two diodes. can minimized controlling impedance line. over circuit, must...
Building a precise alternative neurotoxicological test is of great importance to respond societal and ethical requirements. In this study, new developmental neurotoxicity (DNT) was established with the human neural progenitor cell line. ReNcell CX cells were exposed neurotoxic chemicals (aphidicolin, hydroxyurea, cytosine arabinoside, 5-fluorouracil, ochratoxin A) or non-neurotoxic (sodium gluconate, sodium bicarbonate, penicillin G, saccharin). Propidium iodide (PI) used evaluate viability....