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Gi‑Su Ham,Young‑Kyun Kim,Young Sang Na,Kee‑Ahn Lee 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
This study investigated the effect of Ti addition on microstructure and high-temperature oxidation property of AlCoCrFeNihigh-entropy alloy. Ti content was controlled at 0 at% and 1 at%. The two alloys were found to have BCC single phase, andthe average grain sizes of Ti0.0 and Ti1.0 were 47.3 μm and 49.7 μm, respectively, showing similarity. The EDS mappingof the inside of grains found that both alloys were characterized to be divided into Al-Ni element rich region and Cr–Feelement rich region. As a result of high-temperature oxidation test at 1100 °C, oxidation weight gains were measured atTi0.0: 0.75 mg/cm2 and Ti1.0: 0.17 mg/cm2, respectively. The results indicate that Ti addition largely improved high temperatureoxidation resistance of AlCoCrFeNi HEA. Ti1.0 alloy, in particular, showed remarkably more excellent 1100 °Chigh-temperature oxidation resistance than other previously reported major ones such as NiCrAl and FeCrAl. In the surfaceand cross-section observations after oxidation tests, both alloys were found to have Al2O3oxides mostly. While the Ti0.0material was observed to have Al2O3spallation macroscopically, the Ti1.0 alloy showed Al2O3spallation only in some localareas. In addition, a unique result was found in AlCoCrFeNiTix(x=0,1) alloy that BCC → FCC phase transformation was accelerated,and FCC phase layer was formed in the surficial area where Al element had been depleted due to high-temperatureoxidation. Moreover, as Ti was added, the thickness of FCC layer induced by high-temperature oxidation decreased. Basedon the results, it was also discussed on how to improve the high-temperature oxidation resistance of AlCoCrFeNiTixHEA.
Lee, Sang Kuk,Lee, Gi Woo Elsevier 2005 Chemical physics letters Vol.410 No.1
<P><B>Abstract</B></P><P>With a corona-excited supersonic expansion technique using a pinhole-type glass nozzle, the jet-cooled <I>o</I>-cyanobenzyl radical was generated from <I>o</I>-tolunitrile seeded in a large amount of inert carrier gas He. The vibronically resolved visible emission spectra of the <I>o</I>-cyanobenzyl radical in the D<SUB>1</SUB>→D<SUB>0</SUB> transition were recorded for the first time with a Fourier transform spectrometer equipped with a visible beam splitter. The electronic transition and a few vibrational modes in the ground electronic state were identified from the analysis of the spectra observed.</P>
The novel encapsulation method for organic thin-film transistors
Lee, Jung Hun,Kim, Gi Heon,Kim, Seong Hyun,Lim, Sang Chul,Yang, Yong Suk,Oh, Jiyoung,Youk, Ji Ho,Jang, Jin,Zyung, Taehyoung Elsevier 2005 CURRENT APPLIED PHYSICS Vol.5 No.4
<P><B>Abstract</B></P><P>In this study, we report a novel encapsulation method for longevity of an organic thin-film transistor (OTFT) using pentacene by means of an adhesive multiplayer included Al film. For encapsulation of OTFTs, the Al film adhered onto the OTFT in a dry nitrogen atmosphere using a proper adhesive. A lifetime, which was defined as the time necessary to reduce mobility to 2% of initial mobility value, was observed from the typical <I>I</I><SUB>D</SUB>–<I>V</I><SUB>D</SUB> characteristics of the field-effect transistor (FET). The initial field effect mobility, <I>μ</I>, was measured to be 2.0×10<SUP>−1</SUP> cm<SUP>2</SUP>/Vs. The characterization was maintained for long times in air. No substantial degeneration occurred. The performance and the stability are probably due to the encapsulation effect.</P>
Culture Parameters for Nonactin Production by Streptomyces viridochromogenes JM-4151
Lee, Sang-Han,Lee, Dong-Sun,Lee, Jin-Man,Kim, Tae-Ho,Kim, Jong-Guk,Han, Kab-Cho,Lee, Jin-Sik,Kwon, Gi-Seok Korean Society of Life Science 2001 Journal of Life Science Vol.11 No.1
Nonactin is the parent compound of a group of ionophore antibiotics, that known as the macrotetrolides. In previous report, in th course of screening superoxide radical-generating compounds from microbial sources, we first screened Streptomyces viridochromogenes JM-4151 that produces nonactin. It was proved that nonactin is superoxide radical-producing compound. In present study, we examined the optimal culture conditions of nonacin. Th optimal culture conditions for nonactin production were as follows: 1% soluble starch, 1% yeast extract, 0.2% ammonium nitrate, 0.06% magnesium sulfate, 0.2% calcium carbonate, initial pH 7.0 at 28$^{\circ}C$ for 96 h. The highest nonactin production was achieved in the production medium of initial pH7.0 at 28$^{\circ}C$ for 96h. The threshold level of dissolved oxygen was found to be above 33.2% at 28$^{\circ}C$ when 1% soluble starch was used as a carbon source. These results suggest that S. viridochromogenes JM-4151 might be a possible strain for industrial nonactin producer.
The Effect of Phosphor Thickness and Discharge Space on the Luminance and Addressing Time in ac PDP
Lee, Gi-Bum,Heo, Jeong-Eun,Kim, Gyu-Seup,Kim, Young-Kee,Lee, Sung-Hyun,Cho, Jung-Soo,Park, Chung-Hoo The Korean Institute of Electrical Engineers 2001 Journal of KIEE Vol.11 No.1
In this study, the luminance, luminous efficiency and address time of an PDP as a parameter of the phosphor thickness and the size of discharge space are investigated. The maximum luminance and luminous efficiency are obtained at the phosphor thickness of 30 ${\mu}{\textrm}{m}$ for the rib height of 110 ${\mu}{\textrm}{m}$. For the rib height of 120~160 ${\mu}{\textrm}{m}$, the maximum values are obtained at the thickness of 50 ${\mu}{\textrm}{m}$ regardless of the kind of R, G and B phosphor. These results do not affected by the variation of discharge space. The average decrease rate of the total charge to the phosphor thickness is about 3.35pc/cell/10 ${\mu}{\textrm}{m}$ and the average increase rate of the addressing time is about 0.027 $mutextrm{s}$/10 ${\mu}{\textrm}{m}$.
A CONDITIONAL UNRELATED QUESTION RANDOMIZED RESPONSE MODEL
Lee, Gi-Sung,Hong, Ki-Hak 한국전산응용수학회 2001 The Korean journal of computational & applied math Vol.8 No.1
In this paper we suggest a conditional unrelated question randomized response model by using the Carr et. al.’s model(1982) and Greenberg et. al.’s model(1969). Our model can obtain more comprehensive information about the sensitive character A. We suggest the conditions that make our model efficient compared with models of Greenberg et. al. and Carr et al.. AMS Mathematics Subject Classification : 65D05
Analysis of Tropospheric Carbon Monoxide in the Northeast Asia from MOPITT
Lee, Sang-Hee,Choi, Gi-Hyuk,Lim, Hyo-Suk,Lee, Joo-Hee The Korean Society of Remote Sensing 2003 大韓遠隔探査學會誌 Vol.19 No.3
The Measurement of Pollution in the Troposphere (MOPITT) instrument is an eight-channel gas correlation radiometer that launched on the Earth Observing System (EOS) Terra spacecraft in 1999. Its main objectives are to measure carbon monoxide (CO) and methane (CH4) concentrations in the troposphere. This study analyzes tropospheric carbon monoxide distributions using MOPITT data and compare with ozone distributions in Northeast Asia. In general, seasonal CO variations are characterized by a peak in spring and decrease in summer. Also, this study revealed that the seasonal cycles of CO are maximum in spring and minimum in summer with average concentrations ranging from 118ppbv to 170ppbv. The monthly average of CO shows a similar profile to those of O3. This fact clearly indicates that the high concentration of CO in spring is caused by two possible causes: the photochemical CO production in the troposphere, or the transport of the CO in the northeast Asia. The CO and $O_3$ seasonal cycles in the Northeast Asia are influenced extensively by the seasonal exchange of the different types of air mass due to the Asian monsoon. The continental air masses contain high concentrations of $O_3$ and CO due to higher continental background concentrations and sometimes due to the contribution of regional pollution. In summer the transport pattern is reversed. The Pacific marine air masses prevail over Korea, so that the marine air masses bring low concentrations of CO and $O_3$, which tend to give the apparent minimum in summer.
Functional Genomic Approaches Using the Nematode Caenorhabditis elegans as a Model System
Lee, Jun-Ho,Nam, Seung-Hee,Hwang, Soon-Baek,Hong, Min-Gi,Kwon, Jae-Young,Joeng, Kyu-Sang,Im, Seol-Hee,Shim, Ji-Won,Park, Moon-Cheol Korean Society for Biochemistry and Molecular Biol 2004 Journal of biochemistry and molecular biology Vol.37 No.1
Since the completion of the genome project of the nematode C. elegans in 1998, functional genomic approaches have been applied to elucidate the gene and protein networks in this model organism. The recent completion of the whole genome of C. briggsae, a close sister species of C. elegans, now makes it possible to employ the comparative genomic approaches for identifying regulatory mechanisms that are conserved in these species and to make more precise annotation of the predicted genes. RNA interference (RNAi) screenings in C. elegans have been performed to screen the whole genome for the genes whose mutations give rise to specific phenotypes of interest. RNAi screens can also be used to identify genes that act genetically together with a gene of interest. Microarray experiments have been very useful in identifying genes that exhibit co-regulated expression profiles in given genetic or environmental conditions. Proteomic approaches also can be applied to the nematode, just as in other species whose genomes are known. With all these functional genomic tools, genetics will still remain an important tool for gene function studies in the post genome era. New breakthroughs in C. elegans biology, such as establishing a feasible gene knockout method, immortalized cell lines, or identifying viruses that can be used as vectors for introducing exogenous gene constructs into the worms, will augment the usage of this small organism for genome-wide biology.