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Control System of a MW-class Wind Turbine
Jeonggi Kim,Janghwan Cho,Hansoon Choi,Yoonsu Nam 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This dissertation is on control system for MW-class wind turbine. The basic control structure is on the performance of wind turbine and is a control system tracked power curve. To track the power curve, we discuss the control method for variable speed variable pitch that is used for torque control and pitch control. Furthermore, the MW-class wind turbine is a large structure and mechanical load created from instable load shorten the lifecycle of wind turbine. This dissertation introduces the individual pitch control algorithm aimed to decrease the mechanical load. We apply the suggested algorithm and run through simulations and discuss the results
Kim, Hyo-Min,Cho, Sinyoung,Kim, Jeonggi,Shin, Hyeonjeong,Jang, Jin American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.28
<P>Zinc-oxide (ZnO) is widely used as an n-type electron transporting layer (ETL) for quantum dot (QD) light-emitting diode (QLED) because various metal doping can be possible and ZnO nanoparticle can be processed at low temperatures. We report here a Li- and Mg-doped ZnO, MLZO, which is used for ETL of highly efficient and long lifetime QLEDs. Co-doping, Mg and Li, in ZnO increases its band gap and electrical resistivity and thus can enhance charge balance in emission layer (EML). It is found also that the O-H concentration at the oxide surface decreases and exciton decay time of QDs on the metal oxide increases by co-doping in ZnO. The inverted green QLEDs with MLZO ETL exhibits the maximum current efficiency (CE<SUB>max</SUB>) of 69.1 cd/A, power efficiency (PE<SUB>max</SUB>) of 73.8 lm/W, and external quantum efficiency (EQE<SUB>max</SUB>) of 18.4%. This is at least two times higher compared with the efficiencies of the QLEDs with Mg-doped ZnO ETL. The optimum Li and Mg concentrations are found to be 10% each. The deep-red, red, light-blue, and deep-blue QLEDs with MLZO ETLs exhibit the CE<SUB>max</SUB> of 6.0, 22.3, 1.9, and 0.5 cd/A, respectively. The MLZO introduced here can be widely used as ETL of highly efficient QLEDs.</P> [FIG OMISSION]</BR>
Kim, Hyemi,Yang, Eunjung,Lee, Jeonggi,Kim, Se-Hoon,Shin, Jeon-Soo,Park, Joo Young,Choi, Sun Ju,Kim, Se Jong,Choi, In-Hong Blackwell Publishing Ltd 2008 Immunology Vol.124 No.4
<P>Summary</P><P>Toll-like receptor 3 (TLR3) participates in the innate immune response by recognizing viral pathogens. In this study, human brain astrocytes were found to constitutively express TLR3, and this expression was increased by interferon-&ggr; (IFN-&ggr;) or double-stranded RNA (dsRNA). Treatment employing dsRNA in astrocytes induced IFN regulatory factor 3 (IRF3) phosphorylation, dimer formation and nuclear translocation followed by STAT1 activation. This treatment also activated nuclear factor-&kgr;B, p38 and c-Jun N-terminal kinase significantly, while activating extracellular signal-regulated kinase to a lesser extent. Treatment with anti-TLR3 antibody inhibited dsRNA-mediated interleukin-6 (IL-6) production. In the presence of mitogen-activated protein kinase inhibitors, astrocytes failed to secrete IL-6 in response to dsRNA treatment. Therefore, dsRNA-induced IL-6 production is dependent on mitogen-activated protein kinases and type I IFN production is dependent on IRF3 in brain astrocytes. These results suggest that brain inflammation, which produces inflammatory cytokines and type I IFNs, may enhance TLR3 expression in astrocytes. Additionally, upregulated TLR3 might modulate inflammatory processes by producing proinflammatory cytokines.</P>
Kim, Hyo-Min,Geng, Di,Kim, Jeonggi,Hwang, Eunsa,Jang, Jin American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.42
<P>We report highly efficient inverted quantum-dot light emitting diodes (QLEDs) using an Al doped ZnO (AZO)/Li doped ZnO (LZO) stack electron transport layer (ETL). An introduction of the LZO layer on AZO improved the current and power efficiencies of the green (G-) QLEDs from 10.5 to 34.0 cd A(-1) and from 5.4 to 29.6 lm W-1, respectively. The red (R-), G-, and blue (B-) QLEDs fabricated in this work exhibited the maximum external quantum efficiencies (EQEs) of 8.4, 12.5, and 4.3%, respectively. It is found from time-resolved photoluminescence (PL) and transient electroluminescence (EL) decay that exciton loss at the interface between the ETL and the emission layer can be significantly reduced by introducing LZO.</P>
Kim, Hyo-Min,Kim, Jeonggi,Lee, Jieun,Jang, Jin American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.44
<P>Quantum dots (QDs) are a promising material for emissive display with low-cost manufacturing and excellent color purity. In this study, we report colloidal quantum-dot light emitting diodes (QLEDs) with an inverted architecture with a solution processed charge generation layer (CGL) of <I>p</I>-type polymer (tungsten oxide doped poly(ethylenedioxythiophene)/polystyrenesulfonate, PEDOT:PSS:WO<SUB><I>x</I></SUB>) and <I>n</I>-type metal oxide (lithium doped zinc oxide, LZO). The effective charge generation in solution processed <I>p</I>–<I>n</I> junction was confirmed by capacitance–voltage (<I>C</I>–<I>V</I>) and current density–electric field characteristics. It is also demonstrated that the performances of CGL based QLEDs are very similar when various substrates with different work functions are used.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-44/acsami.5b06505/production/images/medium/am-2015-06505c_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b06505'>ACS Electronic Supporting Info</A></P>
Kim, Jeonggi,Kim, Hyo-Min,Jang, Jin American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.22
<P>We report a low work function (2.81 eV), Rb<SUB>2</SUB>CO<SUB>3</SUB>-doped polyethyleneimine ethoxylated (PEIE) which is used for highly efficient and long-lifetime, inverted organic light-emitting diodes (OLEDs). Doping Rb<SUB>2</SUB>CO<SUB>3</SUB> into PEIE decreases the work function of Li-doped ZnO (LZO) by 1.0 eV and thus significantly improves electron injection ability into the emission layer (EML). The inverted OLED with PEIE:Rb<SUB>2</SUB>CO<SUB>3</SUB> interfacial layer (IL) exhibits higher efficiency and longer operation lifetime than those of the device with a PEIE IL. It is found also that Mg-doped ZnO (MZO) can be used instead of LZO as electron transporting layer. MZO/PEIE:Rb<SUB>2</SUB>CO<SUB>3</SUB> shows a low work function of 2.81 eV. The OLED with MZO/PEIE:Rb<SUB>2</SUB>CO<SUB>3</SUB> exhibits low operating voltage of 5.0 V at 1000 cd m<SUP>-2</SUP> and low efficiency roll-off of 11.8% at high luminance of 10 000 cd m<SUP>-2</SUP>. The results are due to the suppressed exciton quenching at the MZO/organic EML interface.</P> [FIG OMISSION]</BR>
Kim, Hyo-Min,Kim, Jeonggi,Cho, Sin-Young,Jang, Jin American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.44
<P>We report solution-processed metal-oxide p-n junction, Li-doped CuO (Li:CuO) and Li-doped ZnO (Li:ZnO), as a charge generation junction (CGJ) in quantum-dot light-emitting diode (QLED) at reverse bias. Efficient charge generation is demonstrated in a stack of air annealed Li:CuO and Li:ZnO layers in QLEDs. Air annealing of Li:ZnO on Li:CuO turns out to be a key process to decrease oxygen vacancy (V-o) and increase the copper (II) oxide (CuO) fraction at the Li:CuO/Li:ZnO interface for efficient charge generation. Green QLEDs incorporating Li:CuO/Li:ZnO CGJ show the maximum current and power efficiencies of 35.4 cd/A and 33.5 lm/W, respectively.</P>
김정기(Jeonggi Kim),남윤수(Yoonsu Nam),최한순(Hansoon Choi),조장환(Janghwan Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
This paper introduces a methodology for the power control of a wind turbine. A baseline control law are about variable speed variable pitch control of a MW-class wind turbine. For the baseline control, control strategy. and control algorithm in operation regions are introduced. The baseline control is applied to the power curve tracking control. And a numerical dynamic model of wind turbine was derived from simplified drive train model. And finally, simulation results using torque control and pitch control are discussed.