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Synergistic Strengthening Effect of Ultrafine-Grained Metals Reinforced with Carbon Nanotubes
Jeong, Yong ,J.,Cha, Seung ,I.,Kim, Kyung ,T.,Lee, Kyong ,H.,Mo, Chan ,B.,Hong, Soon ,H. WILEY-VCH Verlag 2007 Small Vol.3 No.5
<B>Graphic Abstract</B> <P>From strength to strength: Two strengthening mechanisms, grain-size refinement of a metal matrix and reinforcement with homogeneously dispersed CNTs, are combined to fabricate strong CNT/Co nanocomposites (see image). The CNT/Co nanocomposites with an ultrafine-grained Co matrix and homogeneously dispersed CNTs show synergetic strengthening effects with improved mechanical performance. <img src='wiley_img/16136810-2007-3-5-SMLL200600523-content.gif' alt='wiley_img/16136810-2007-3-5-SMLL200600523-content'> </P>
Jeongyong Lee,Youngae Jung 한국디지털콘텐츠학회 2019 The Journal of Contents Computing Vol.1 No.1
People generally utilize internet searching as a mean of the obtainment of information before using any other searching method. However, the amount of data on the Internet is ginormous so that it is almost impossible to check them all manually at the same time there is a wide gap between the level and the reliability of the data. This paper began to solve the above-mentioned issues and proposed the method to collect and refine reliable information from the Internet using web crawling technology literary research. This research conducted the web crawling using a specified keyword based on Korean writer and collect the concerned data from the internet newspapers that guarantee minimum reliability. Nouns extracted from the collected data through the process and sorted by frequency. Nouns with a high frequency mean that they are highly related to the author so that they can utilize as basic data to decide the direction for research concerned writers" works.
Single Crystal Growth and Magnetic Properties of Mn - doped Bi₂Se₃ and Sb₂Se₃
Jeongyong Choi,Hee-Woong Lee,Bong-Seo Kim,Sungyoul Choi,Jiyoun Choi,Sunglae Cho 한국자기학회 2004 Journal of Magnetics Vol.9 No.4
We have grown Mn-doped Bi₂Se₃ and Sb₂Se₃ single crystals using the temperature gradient solidification method. We report on the structural and magnetic propertis of Mn-doped Bi₂Se₃ and Sb₂Se₃ compound semiconductors. The lattice constants of several percent Mn-doped Bi₂Se₃ and Sb₂Se₃ were slightly smaller than those of the un-doped samples due to the smaller Mn atomic radius (1.40 Å) than those of Bi (1.60 Å) and Sb (1.45 Å). Mn-doped Bi₂Se₃ and Sb₂Se₃ showed spin glass and paramagnetic properties, respectively.
Magnetic field-dependent ordinary Hall effect and thermopower of VO2 thin films
Jeongyong Choi,Bong-Jun Kim,Giwan Seo,Hyun-Tak Kim,Sunglae Cho,Yong Wook Lee 한국물리학회 2016 Current Applied Physics Vol.16 No.3
We investigated the magnetic field-dependent Hall effect and the thermopower in VO2 thin films at various temperatures by using physical property measurement systems. From the ordinary Hall effect measured at 300e370 K, it was found that the Hall voltage decreased with increasing magnetic field, attributed to the weakening of strong electron correlation, and dominant charge carriers were changed implying the existence of mixed phases near the critical temperature of VO2. A gradual thermopower increase and its sign inversion with increasing temperature gradient were observed at 320e350 K, which seems to stem from percolation processes during the phase transition in VO2.
Efficacy of reduced-size short tandem repeat PCR analysis for degraded DNA samples
Jeongyong Kim,Hyojeong Kim,Youn‑Hyoung Nam,Ja Hyun Lee,Hyo Sook Kim,Eungsoo Kim 한국유전학회 2021 Genes & Genomics Vol.43 No.7
Background Short tandem repeats (STR) typing is an essential analysis method for human identifcation in forensic feld. When DNAs obtained from the feld as evidences are severely degraded or in too small amounts, STR analysis often shows allele drop-out. Objective To improve STR analysis for degraded DNA or trace DNA, reduced-size STR (rSTR) polymerase chain reaction (PCR) system was devised by selecting relatively large-size STR loci. Methods The rSTR PCR system consisted of 8 loci (amelogenin, SE33, CSF1PO, D7S820, D13S317, D2S1338, TPOX, and FGA). The size of PCR product was reduced by designing new primers in the fanking region. The efciency of this system was verifed against existing kits through concordance study, sensitivity study, efciency study, and casework sample study. Results The size of PCR product in the rSTR PCR system was reduced to be less than 322 bp. The amplicon of each locus was reduced by about 100 bp on average. Results of this rSTR PCR system were confrmed using 146 Korean samples and other commercial kits. The rSTR PCR system was capable of analyzing DNA samples with a minimum amount of DNA of 16 pg and a degradation index of 4.215. Conclusion The rSTR PCR system was more efective than other PCR kits for obtaining genetic profles from a small amount of DNA or degraded DNA. The combination of this new system and other commercial kits is more efective than existing systems. This combination is expected to be helpful for the identifcation of unidentifed bodies and skeletal samples.