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Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect
Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.
Won Seok Chae,Chun Nam Cha,Chang Yeul Yoo,Suk Kim,Hu Jang Lee 한국예방수의학회 2017 예방수의학회지 Vol.41 No.4
This study examined the acute toxicity of Super-Neophensan containing florfenicol and acetaminophen in male and female Sprague-Dawley rats. Rats were orally administered the drug at dose levels of 0, 250, 500, 1,000 and 2,000 mg/kg body weight (BW) for the single-dose toxicity test. BW changes in all treated groups were not significantly different to those in the control treated with saline. In hematological and blood biochemical analyses, all parameters were unaffected by the drug. In the same way, there were no significant differences between all treated groups and the control group in terms of markers for liver and kidney functions. As no adverse effects were observed with the drug in the single-dose oral toxicity test, even at the highest concentration of the drug, the lethal dose 50 (LD50) of Super-Neophensan is estimated to be greater than 2,000 mg/kg BW.
Chae, Yun-Won,Park, Ji-Won,Nam, Ki-Seok 대한물리치료학회 2017 대한물리치료학회지 Vol.27 No.6
Purpose: This study aimed to evaluate the changes in dorsiflexion and balance following proximal and distal tibiofibular joint manipulation in individuals with a history of lateral ankle sprain (LAS). Methods: Fifteen participants with a history of unilateral LAS, exhibiting a restriction in ankle dorsiflexion were included in this study. LAS ankle received a manipulation to the proximal and distal tibiofibular joint, while the opposite control ankle received no manipulation intervention. The outcome measures included ankle dorsiflexion and balance. Ankle dorsiflexion was measured using weight-bearing lunge test. Static and dynamic balances were measured using the overall, anterioposterior, and mediolateral balance index via the biodex balance system. Measurements were obtained prior to and following manipulation. Results: This study showed that ankle dorsiflexion and dynamic balance were improved following the manipulation compared to those prior to the manipulation (p<0.05). There was no significant change in static balance (p>0.05). Conclusion: The joint manipulation technique applied to the ankle of those with a history of LAS appears to improve ankle dorsiflexion and dynamic balance. This suggest that a manipulation to the proximal and distal tibiofibular joint could be provided as preliminary data regarding the prophylactic effects of recurrent LAS.
Chae, Hansong,Han, Seung Jung,Kim, Su-Young,Ki, Chang-Seok,Huh, Hee Jae,Yong, Dongeun,Koh, Won-Jung,Shin, Sung Jae American Society for Microbiology 2017 Journal of clinical microbiology Vol.55 No.9
<P>The prevalence of tuberculosis continues to be high, and nontuberculous mycobacterial (NTM) infection has also emerged worldwide. Moreover, differential and accurate identification of mycobacteria to the species or subspecies level is an unmet clinical need. Here, we developed a one-step multiplex PCR assay using whole-genome analysis and bioinformatics to identify novel molecular targets. The aims of this assay were to (i) discriminate between the Mycobacterium tuberculosis complex (MTBC) and NTM using rv0577 or RD750, (ii) differentiate M. tuberculosis (M. tuberculosis) from MTBC using RD9, (iii) selectively identify the widespread M. tuberculosis Beijing genotype by targeting mtbk_20680, and (iv) simultaneously detect five clinically important NTM (M. avium, M. intracellulare, M. abscessus, M. massiliense, and M. kansasii) by targeting IS1311, DT1, mass_3210, and mkan_rs12360. An initial evaluation of the multiplex PCR assay using reference strains demonstrated 100% specificity for the targeted Mycobacterium species. Analytical sensitivity ranged from 1 to 10 pg for extracted DNA and was 10(3) and 10(4) CFU for pure cultures and nonhomogenized artificial sputum cultures, respectively, of the targeted species. The accuracy of the multiplex PCR assay was further evaluated using 55 reference strains and 94 mycobacterial clinical isolates. Spoligotyping, multilocus sequence analysis, and a commercial real-time PCR assay were employed as standard assays to evaluate the multiplex PCR assay with clinical M. tuberculosis and NTM isolates. The PCR assay displayed 100% identification agreement with the standard assays. Our multiplex PCR assay is a simple, convenient, and reliable technique for differential identification of MTBC, M. tuberculosis, M. tuberculosis Beijing genotype, and major NTM species.</P>
Functional polymorphism in the MicroRNA-367 binding site as a prognostic factor for colonic cancer.
Chae, Yee Soo,Kim, Jong Gwang,Kang, Byung Woog,Lee, Soo Jung,Lee, Yoo Jin,Park, Jun Seok,Choi, Gyu Seog,Lee, Won Kee,Jeon, Hyo-Sung Potamitis Press 2013 Anticancer research Vol.33 No.2
<P>As microRNAs play important roles in cancer development and progression by regulating the expressions of oncogenes and tumor suppressor genes though interacting with the 3' untranslated region (UTR) of target genes, we aimed to evaluate the association between genetic variants of miRNAs and their binding sites and prognosis in patients with colorectal cancer (CRC).</P>