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박동철,정태균 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
Equalization of satellite communication using Complex-Bilinear Recurrent Neural Network(C-BLRNN) is proposed in this paper. Since the BLRNN is based on the bilinear polynomial, it has been more effectively used in modeling highly nonlinear systems with time-series characteristics than multi-layer perception type neural networks(MLPNN). The BLRNN is first expanded to its complex value version(C-BLRNN) for dealing with the complex input values. C-BLRNN is then applied to equalization of a digital satellite communication channel for M-PSK and QAM, which has severe nonlinearity with memory due to TWTA(Traveling Wave Tube Amplifier). The proposed C-BLRNN based equalizer for a channel model is compared with currently used Volterra filter Equalizer, DFE, and conventional Complex MLPNN Equalizer. The results show that the proposed C-BLRNN based equalizer gives very favorable results in both of MSE and BER criteria over Volterra filter Equalizer, DFE, and Complex MLPNN Equalizer.
Kim, Cha-Young,Koo, Yoon-Duck,Jin, Jing-Bo,Moon, Byeong-Cheol,Kang, Chang-Ho,Kim, Sun-Tae,Park, Byung-Ouk,Lee, So-Young,Kim, Man-Lyang,Hwang, In-Hwan,Kang, Kyu-Young,Bahk, Jeong-Dong,Lee, Sang-Yeol,,C Plant molecular biology and biotechnology research 2003 Plant molecular biology and biotechnology research Vol.2003 No.-
ABSTRACT: Hundreds of proteins involved in signaling pathways contain a Ca^(2+)-dependent membrane-binding motif called the C2-domain. However, no small C2-domain proteins consisting of a single C2-domain have been reported in animal cells. We have isolated two cDNA clones, OsERG1a and OsERGIb, that encode two small C2-domain proteins of 156 and 159 amino acids, respectively, from a fungal elicitor-treated rice cDNA library. The clones are believed to have originated from a single gene by alternative splicing. Transcript levels of the OsERG1 gene are dramatically elvated by a fungal elicitor prepared from Magnaporthe grisea or by Ca^(2+) ions. The OsERG1 protein produced in Escherichia coli binds to phospholipid vesicles in a Ca^(2+)-dependent manner and is translocated to the plasma membrane of plant cells by treatment with either a fungal elicitor of a Ca^(2+)-ionophore. These results suggest that OsERG1 proteins containing a single C2-domain are involved in plant defense signaling systems.
정태균,박동철 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-
Equalization of satellite communication using Complex-Bilinear Recurrent Neural Network(C-BLRNN) is proposed in this paper. Since the BLRNN is based on the bilinear polynomial it has been more effectively used in modeling highly nonlinear systems with time-series characteristics than multi-layer perceptron type neural networks(MLPNN). The BLRNN is first expanded to its complex value version(C-BLRNN) for dealing with the complex input values C-BLRNN is then applied to equalization of a digital satellite communication channel for M-PSK and QAM, which has severe nonlinearity with memory due to TWTA(Traveling Wave Tube Amplifier). The proposed C-BLRNN based equalizer for a channel model is compared with currently used Volterra filter Equalizer. DFE, and conventional Complex MLPNN Equalizer. The results show that the proposed C-BLRNN based equalizer gives very favorable results in both of MSE and BER criteria over Volterra filter Equalizer, DFE, and Complex MLPNN Equalizer.
He, Mingrui,Kim, Jihun,Suryawanshi, M.P.,Lokhande, A.C.,Gang, Myengil,Ghorpade, U.V.,Seon Lee, Dong,Hyeok Kim, Jin Elsevier 2018 Solar energy materials and solar cells Vol.174 No.-
<P><B>Abstract</B></P> <P>Ge alloyed Cu<SUB>2</SUB>SnS<SUB>3</SUB> (CTGS) thin films were prepared by annealing the sputtered deposited Cu-Ge-Sn precursor films under sulfur atmosphere at different annealing temperatures. The influence of different annealing temperatures on morphological, compositional, crystal structure of CTGS thin films were investigated. It was found that the annealing temperature of 550°C provides a favorable sulfurization environment to promote grain growth leading to a compact thin film formation. Improved performance is ascribed to high Ge contents as evidenced from X-ray fluorescence (XRF) studies. Well incorporated Ge atoms into CTS thin film can be confirmed by X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) study provides an evidence of existence of Ge atoms where its binding energy located at 25.78 and 26.78eV, respectively. However, the decreased performance was found at unsuitable annealing temperatures such as 500°C, 520°C, 580°C and 600°C. Finally, with annealing temperatures of 550°C, the best power conversion efficiency (PCE) of 2.14% was attained with an open circuit voltage (<I>V</I> <SUB>oc</SUB>) of 220mV, a short circuit current density (<I>J</I> <SUB>sc</SUB>) of 23.74mA/cm<SUP>2</SUP> and a fill factor (<I>FF</I>) of 41%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ge Alloyed Cu<SUB>2</SUB>SnS<SUB>3</SUB> (CTGS) thin film solar cells have been successfully fabricated at different annealing temperatures. </LI> <LI> Annealing temperature dependence on photovoltaic properties of CTGS thin films was studied. </LI> <LI> Ge atoms can be well incorporated to the CTS thin film at annealing temperature of 550°C. </LI> <LI> CTGS thin film solar cell exhibited the highest efficiency of 2.14%. </LI> </UL> </P>
A Computational Study on the Scale Effects of Hybrid Rocket Motors
C Palani Kumar,Amit Kumar,Heuy-Dong Kim(김희동) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
In the present work, a numerical investigation is carried out for physics based identification of key parameters that govern scaling of single cylindrical port hybrid rocket motors. The grain port length to port diameter (or L/D) ratio was found to be a key scaling parameter along with maintaining oxidizer mass flux (GOX) for near identical motor performance. Since L/D ratio dictates the overall oxidizer to fuel ratio (O/F), there exists an optimal L/D ratio (near stoichiometric overall O/F ratio) at which the characteristic exhaust velocity C<SUP>*</SUP> and combustion efficiency ηC are maximum. Thus the scope for tangible improvement in C<SUP>*</SUP> and ηC using a regression rate enhancement technique is only for motors with grain L/D ratio appreciably less than the optimal L/D ratio.
Dong‑Dong Chen,Y. C. Lin 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
To obtain the designed target microstructures of an aged superalloy during isothermal forging, a multi-level processingparameters optimization method is developed based on particle swarm optimization (PSO) algorithm. In the developedmethod, the accurate material models are used to characterize the microstructural evolution. Based on the designed targetmicrostructures, the global and local optimality criterions are constructed to alternately optimize global and local multi-levelprocessing parameters by the PSO algorithm with a linear decreasing inertia weight strategy. The optimized initial volumefraction of δ phase (δVF), deformation temperature and strain rate are 12.95%, 1000 °C and 0.001 s−1, respectively. Accordingto these optimized parameters, the recrystallization volume fraction, average grain size and δVF are 100%, 11.2 μm and2.1%, respectively, which well agree with the designed targets. Additionally, the processing parameters optimized by thedeveloped method and traditional processing maps are compared. It is found that the developed method is more effective tocontrol microstructures for the studied superalloy.
KIM, DONG I.,KIM, EUN H.,BYUN, JONG C.,CHOI, JONG H.,NA, HUN G.,PARK, YU C. 濟州大學校 基礎科學硏究所 2002 基礎科學硏究 Vol.15 No.2
The benzoylated asymmetrical nickel(Ⅱ) complexes, 2,4,9,11 -tetramethyl-3,10-dibenzoyl- 1,5,8,12-([ 14]-Xbenzo)tetraazacyclotetradecinato(2-)nickel(II) (A_(1-4)) and 2,4,10,12-tetra- methyl3, l1-dibenzoyl-l,5,9,13-([15]-Xbenzo)tetraazacyclotetradecinato(2-)nickel(II) (B_(1-4)), wherein X=CH3 (A_(l) and B_(1)), H (A_(2) and B_(2)), C1 (A3 and B_(3)) and NO_(2) (A_(4) and B_(4)), have been synthesized and characterized by analysis, IR, electronic, ^(1)H- and ^(13)C-NMR spectra. An intense IR band due to C=O stretching is present in the range 1630-1650cm^(-1) upon benzoylation. Electronic spectra show bands at 375-390nm with ^(ε)max = 10000- 26000 M^(-1)cm^(-1) due to π → π^(*) transitions of macrocycles and at 500-550 nm with (ε)max = 10000- 5000 M^(-1)cm^(-1) attributable to LMCT for each of the complexes. The proton peaks of methine sites in the NMR spectra disappear on benzoylation. Results of the carbon-13 NMR spectra are compatible with those of the proton NMR. Cyclic voltammograms of the complexes in acetonitrile exhibit two successive and reversible (irreversible in DMSO) oxidation peaks for the macrocycle (Mc → Mc^(+) and Mc^(+) →Mc^(2+)) in the ranges +0.31-+0.51 and +0.60-+0.84V, respectively. In the reduction area, a reversible wave is followed by reduction of metal {Ni(II) → Ni(Ⅰ) at around -2.32V}. Unlike analogous complexes without the benzoyl group, those compounds are not electropolymerized by cyclic voltammetry.