A5101405739- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced DC-DC Converters
- Consumer Perception and Purchasing Behavior
- Liquid Crystal Research Advancements
- Diverse Topics in Contemporary Research
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Technology and Data Analysis
- Diverse Approaches in Healthcare and Education Studies
- Organometallic Complex Synthesis and Catalysis
- Silicon Carbide Semiconductor Technologies
- Advanced Battery Technologies Research
- Fluorine in Organic Chemistry
- Membrane Separation and Gas Transport
- Asymmetric Hydrogenation and Catalysis
- Photonic and Optical Devices
- Catalytic C–H Functionalization Methods
- Synthesis and properties of polymers
- Radical Photochemical Reactions
- Carbon Dioxide Capture Technologies
- Dispute Resolution and Class Actions
- HVDC Systems and Fault Protection
- Electric Power Systems and Control
- ZnO doping and properties
Gyeongsang National University
2024
Korea Advanced Institute of Science and Technology
2023
Korea Institute of Industrial Technology
2023
Max-Planck-Institut für Kohlenforschung
2016-2017
Harvard University
2016-2017
Sungkyunkwan University
2011-2015
Yonsei University
2011-2012
Korea University
2012
We report a C-F reductive elimination from characterized first-row aryl metal fluoride complex. Reductive the presented nickel(III) complexes is faster than bond formation any other
Nickel nanoparticles (NiNPs) prepared in tetraglyme (TG) efficiently catalyzed the conversion of ammonia borane (AB, NH3BH3) to borazine (B3N3H6). Under optimized conditions, 3 mol% NiNPs were introduced into a 1.5 M AB solution TG and held at 80 °C for 6 h under dynamic vacuum that was maintained 30 torr. Borazine isolated through series −45 °C, −78 −196 traps give (−78 trap) pure 53% yield. The produced then utilized as molecular precursor high quality h-BN (white graphene) large area...
Iron complexes are commonly used in catalysis, but the identity of active catalyst is often unknown, which prevents a detailed understanding structure–reactivity relationships for design. Here we report isolation and electronic structure determination well-defined, low-valent iron complex that an synthesis cis,cis-1,5-cyclooctadiene (COD) from 1,3-butadiene. Spectroscopic magnetic characterization establishes high-spin Fe(I) center, supported by DFT studies, where partial metal–ligand...
Abstract We report a C−F reductive elimination from characterized first‐row aryl metal fluoride complex. Reductive the presented nickel(III) complexes is faster than bond formation any other
Conventional methods for improving the hydrophobicity of polypropylene (PP) membranes to prevent wetting phenomena require complex pretreatment procedures in order activate surface enabling reaction with fluorosilane (FS)-based materials. This study successfully prepared PP membrane contactors enhanced through a simple single-step dip-coating method using perfluoroether-grafted silanes CO2 capture. The FS coating layer on was confirmed ATR-FTIR spectroscopy, XPS, FE-SEM, and EDS....
Abstract This paper introduces zirconia (ZrO2) use in liquid crystal (LC) alignment for uniform and effective LC orientation. We used a conventional rubbing process to induce alignment. As result, alignments were achieved all samples with ZrO2 nanoparticles from 0.01 wt% 0.3 wt%. Pretilt angles of LCs on doped layers slightly increased as the percentage rose. However, contact almost same. When twist-nematic (TN) cells nanoparticle content 0.1 wt%, best performance was shown. Finally, it is...
In this paper, the soft start method of three-phase AC/DC converter using improved sliding mode controller which has combined a and PI in DC distribution system for building application is proposed. The performances voltage have been compared performance verified with experiment. proposed keep tenacity parameter fluctuation dynamic controller, allowing it to fundamentally minimize overshoot controlled voltage.
This is a study of ion beam (IB)-irradiated polydimethylsiloxane (PDMS) layer-induced liquid crystal (LC) effects and electro-optical (EO) properties with varying IB incident angles. Depending on the angle, homogeneously aligned LC PDMS layer via irradiation was embodied alignment capability performance. Based X-ray photoelectron spectroscopic (XPS) analysis, intensity O–Si as function angle shows oxidation IB-treated surface. It revealed that van der Waals forces generated by delocalised...
This paper proposes a new buck-boost converter with multi-mode for photovoltaic MLPE(Module Level Power Electronics). The proposed consists of two SiC MOSFET switches, Si diodes, an inductor, and input/output capacitor. Control the has buck control, boost bypass RSD control modes depending on PV module status. operates using multi-carrier PWM method. method advantage being able to without complex algorithms. Also, design heatsink component selection are crucial reducing size weight MLPE...
In this paper, 3-level Active NPC inverter of predictive thermal modeling controls losses through the modeling. advantage conventional 3-Level NPC, generated in each switch is unbalanced. Also, utilization designed system has decreased. Thus, order to compensate, can distribute loss accordance with operation active switch. Therefore, controlled distribution method by using and verified simulation results.
Conventional methods for improving the hydrophobicity of polypropylene (PP) to prevent wetting phenomena require complex pretreatment procedures in order activate surface enabling reaction with fluorosilane (FS)-based materials. This study successfully prepared PP membrane contactors enhanced through a simple single-step dip-coating method using perfluoroether-grafted silanes CO2 capture. The FS coating layer on was confirmed ATR-FTIR spectroscopy, XPS, FE-SEM, and EDS. Furthermore,...
This paper proposes that each converter supplies the power using proposed droop control for parallel operation of converters. The method is easy to increase as system in DC distribution. By improving conventional droop-control used AC grid newly, a controller designed apply grid. And explained particularly. In this paper, by applying distribution system, propriety verified through simulation and experiment.
In this paper, power control method is proposed when converters are configured in parallel for increasing capacity. Each module and load transformed by equivalent circuit model. And controlled through the equation. Power can be of each reduced circulate current. Proposed applied to converter modules DC distribution system verified simulation result experiment.
We present the characteristics of titanium dioxide (TiO2) inorganic film deposited by RF magnetron sputtering for liquid crystal display applications in this paper. TiO2 films supported vertically aligned (LC) molecules based on ion-beam (IB) irradiation time dependence. Uniform alignment was obtained only when incident two minutes with 1.8 keV energy and an angle 45°. Energy from uniform high-density plasma IB affected interaction between layer LC to produce vertical molecules.
본 연구는 2014년 4분기부터 2016년 3분기까지 국내 TV와 인쇄 매체를 통해 집행된 총 327편의 정부 광고를 대상으로 그 내용을 분석한 것이다. 연구에서는 광고의 기존 분류 체계가 지닌 문제점을 확인하였고, 이를 개선하는 새로운 분류방식으로 유형, 주제, 그리고 목적에 따른 체계를 제안하였다. 특히 목적은 향후 효과 측정과 연계될 수 있는 유용한 기준으로 활용 가능성이 높을 한편, 기관별로 집행 매체와 목적, 광고에 담긴 정보적 내용이 상이하였는데, 일례로 중앙 정부에서는 주로 TV를 광고 매체로 활용하였고, 건강, 보건, 안전을 주제로 대중의 행동 유발을 목적으로 하는 광고가 많았다. 또한 따라 매체, 메시지의 조절 초점에 차이가 나타났다. 예를 들어 일반 공지 목적의 광고는 통한 향상 초점의 메시지를 많이 사용하는 반면, 인식 변화를 활용했고, 초점과 예방 두루 것으로 정부광고의 분석에 필요한 다양한 유목을 도출하여 특성을 종합적으로 설명하는 동시에 실무적...
이 연구는 다중매체 환경과 소비자의 이용에 집중하여 TV와 디지털 매체 및 광고 유형별 효과, 이용도에 따른 매체·광고 효과 차이를 탐색해보고자 했다. 매체와 유형 노출에 따라 집단 4개(집단 1: TV 가상광고, 2: 가상광고+TV 영상광고, 3: 영상광고+디지털 4: 배너광고)로 구성했다. 응답자들은 임의적으로 한 집단에 배정 되어 광고에 노출된 뒤 문항에 응답했다. 그 결과, 디지털의 다양한 유형을 동시 집행했을 때 전반적으로 효과가 긍정적이었으나, 사후 분석에서 1과 2, 3, 4 간의 차이만 나타났다. 전통매체와 미디어의 크로스미디어 집행에서 ‘다중매체 이용도’는 중 ‘광고 태도’와 ‘구전 의도’에 핵심요소로 작용하는 것으로 밝혀졌다. 분석결과들을 바탕으로 광고의 원소스 멀티 유즈(one source multi use) 전략보다 플랫폼 특징을 살린 제작과 전략, 이용자들을 대상으로 전략의 필요성을 논했다.
It is DC power that Output of renewable energy being recently developed and researched. Also, demand will expect to proliferate due increase digital load. Thus, distribution system providing high quality reliability has emerged as a new system. If the conventional systems are substituted by proposed system, output can be connected with under minimum conversion. Therefore, in event connection load, it construct an efficient In this paper, integrated parallel operation conversion module for...