A5101730241- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- Radioactive element chemistry and processing
- Engineering Applied Research
- Radioactive contamination and transfer
- Semiconductor materials and devices
- Induction Heating and Inverter Technology
- Sensorless Control of Electric Motors
- Magnetic Properties and Applications
- Copper Interconnects and Reliability
- Groundwater flow and contamination studies
- Nuclear and radioactivity studies
- Radioactivity and Radon Measurements
- Soil and Unsaturated Flow
- Real-time simulation and control systems
- Advanced Battery Materials and Technologies
- Internet of Things and Social Network Interactions
- Nuclear Materials and Properties
- Ferroelectric and Piezoelectric Materials
- Advanced ceramic materials synthesis
- Spectroscopy and Quantum Chemical Studies
- Chemical Synthesis and Characterization
- Nuclear materials and radiation effects
- Photochemistry and Electron Transfer Studies
- Drilling and Well Engineering
Pusan National University
2024-2025
Korea Electronics Technology Institute
2023-2025
Korea Atomic Energy Research Institute
2005-2023
Hanyang University
2015-2019
Kunsan National University
2012
University of Akron
2008-2009
Japan Atomic Energy Agency
2008
Seoul National University
2002-2004
Chonnam National University
2004
Korea Research Institute of Bioscience and Biotechnology
2002
On the basis of a hit from random screening, novel class small-molecule sortase A inhibitors was generated. The primary structure−activity relationship and minimal structural requirements for potency were established through modifications molecular modeling studies.
Abstract The interplay between surface reconstruction and depolarization of ferroelectric oxide surfaces is strongly influenced by oxygen vacancies (V O ). Using in‐situ atomic‐resolution electron microscopy imaging spectroscopy techniques, it directly observed that a clean BaTiO 3 (001) stabilizes into (2 × 1) BaO‐terminated during vacuum annealing. This achieved with accommodating BaO deficiency incorporates TiO x adunits. cooperative atomic rumpling in both the subsurface layers, arranged...
This paper discusses a permanent-magnet electromagnetic brake for the semiconductor process of hollow integrated modules. is characterized by permanent magnets arranged at bottom stator and coils positioned in middle portion stator. The attractive force generated magnetic energy from magnet, to counteract holding force, current must be applied coils. In case brake, maximum that can fixed magnet inserted bottom, even if load conditions vary, cannot altered. study investigated method secure an...
Recently, electric power consumption has increased rapidly owing to the development of devices, and thus environmental problems such as global warming have come fore. Therefore, developed developing countries are preparing various measures prevent warming. Minimum energy performance standards (MEPS) one representative measures. MEPS is an efficiency regulation for induction motors that limits minimum with regard motors, in order save energy. Studies been conducted on improve satisfy MEPS....
Electronic absorption spectra of the low-lying pipi(*) and pisigma(*) states several aminobenzonitriles 4-dimethylaminobenzethyne have been studied by time-resolved transient time-dependent density functional theory calculation. In acetonitrile, lifetime pisigma(*)-state is very short (picoseconds or subpicosecond) for molecules that exhibit intramolecular charge transfer (ICT), long (nanoseconds) those do not. Where direct comparison temporal characteristics ICT-state transients could be...
This paper presents the design of an ultrahigh speed permanent magnet (PM) motor/generator driven at a rated output and 10 kW 70 000 r/min, respectively, for use in electric-turbo compounding system. When designing very-high motor/generator, mechanical structural safety rotor losses that occur when motor operates high should be considered safe operation. In this paper, optimal PM is performed with finite element analysis analysis. Especially, electromagnetic characteristics based on sleeve...
The utilization of an in-plane lattice misfit in oxide epitaxially grown on another with a different parameter is well-known approach to induce strains materials. However, achieving sufficiently large strain this heteroepitaxial configuration usually challenging, unless the thickness kept well below critical value prevent formation dislocations at interface for relaxation. Instead adhering conventional approach, here, we employ nanometer-scale fields built around examine effects two distinct...
This paper discusses the design of a synchronous reluctance motor designed to replace 5.5 kW industrial induction motor. End plates are axially placed at both ends an fix lamination rotor. It is manufactured from magnetic materials ensure manufacturing convenience and price advantage. With its construction materials, lower output due axial flux leakage observed. analyzed drop in caused by end plate constructed material methods compensate for said drop. The first method improve degradation...
The wheelset is an important part that affects the dynamics of railway vehicles. main purpose to solve problem stability, curve performance, comfort, and wear. A conventional vehicle adopts rigid-axle (RW) due self-centering mechanism. On other hand, independently rotating wheels (IRWs) have not been widely applied in industry, since they do generate any It creates excessive wear, derailment may occur. However, IRWs excellent curving performance compared with RWs, it enables realizing a...
A practical synthetic route to 4-acetylisocoumarins and the first total synthesis of AGI-7 (5) sescandelin (4) are described. The readily available homophthalate 8 was transformed vinylogous amide ester 13 in high overall yield. Upon treatment with refluxing aqueous formic acid, desired 4-acetylisocoumarin its regioisomer 3-methyl-4-formylisocoumarin (17) were produced a 3:1 ratio. After separation product from unwanted minor isomer, enantioselective reduction by borane presence Corey's...
This paper suggests a hybrid exited Flux Switching Permanent Magnet (FSPM) motor which has flux control characteristics. First of all, the structure FSPM with characteristics is suggested and basic principle how it works exp
A concerted experimental and computational study of 4-(dimethylamino)benzethyne, DMABE, has been carried out to probe the low-lying πσ* state role it plays in photophysics molecule. The subpicosecond transient absorption spectra reveal presence a strong excited-state at about 700 nm weaker 520 nm. observed maxima are excellent agreement with TDDFT calculations that place strongly allowed ←πσ* transition 750 nm, ππ* ←ππ* (LE) 528 This combined differing decay times, solvent shifts two...
국내 심부지질환경조건을 반영한 처분안전성 평가에 필요한 입력자료를 제공하기위해, 그 동안 지하시험시설(KURT)환경조건에서 많은 실험을 수행해 왔다. 안전성평가코드에 사용되는 입력변수들 중 중요성이 부각되는 입력변수들을 선정하여, 각 변수별로 수집한 자료를 통계처리를 하여 값 분포 특성을 기술하고, 외국자료 값과 비교평가를 통해 값의 타당성을 검토하였다. 다룬 입력변수로서 용기물성분야에서 용기수명, 초기파손률을, 완충재물성분야에서는 핵종용해도, 완충재의 공극률, 밀도, 확산계수, 핵종분배계수를, 암반 및 원계영역에서는 수리전도도, 지하수유속, 핵종분배계수, 확산깊이, 암반균열폭, 주지하수유동통로까지 거리, 핵종이동오염운의 너비 등이다. To provide domestic values of input parameters in a safety assessment radioactive waste disposal under deep underground environments,...
Generally, brushless dc (BLDC) motor control uses a 120° conduction method that utilizes low-cost Hall sensor as position sensor. However, because of the mounting error and uneven magnetic flux density rotor, an erroneous signal may be output, which will adversely affect BLDC control. Therefore, this paper analyzes abnormal electric current section occurs due to density. Subsequently, is derived from analyzed phenomenon formula. The compensation algorithm overcome problem studied, maintain...
Recently, policies for carbon reduction are being implemented worldwide to solve environmental and energy consumption problems. Minimum Energy Performance Standard (MEPS) is a policy reducing by regulating the efficiency of industrial induction motors. The motors have low manufacturing cost simple structure, it can be operated without control great advantages in maintenance so applied various fields. However, compared with other types motors, there limit improving due additional loss...
Previous researches have been conducted on the multi-degree of freedom operation motor, a new mechanism for power conversion out existing motor from early in 2000. Various types structure suggested to operate more than two-degree (DOF) one point action and control methods studied appropriately each structure. This led overall improvement interpreting drive ability interpret operating characteristics, but few applications development practically. On other hand, UAV systems like multi-copter...