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Planar Spiral Coil Design for a Pulsed Induction Metal Detector to Improve the Sensitivities
Bobae Kim,Seung-hoon Han,Kangwook Kim IEEE 2014 IEEE antennas and wireless propagation letters Vol.13 No.-
<P>In a pulsed induction metal detector system, the sensitivity variation for detectable minimum metal target and the maximum detection distance are investigated as the winding geometry of the search coil is varied. A number of planar square spiral mono coils with various fill ratios and wire spacing-to-width ratios are comparatively analyzed based on a numerical simulation. Five representative coils are fabricated and applied to a pulsed induction metal detector system as a search coil. It is demonstrated that a search coil with a larger fill ratio has a high size sensitivity for a minimum metal target at close distances, which may be missed by coils with smaller fill ratios. A search coil with a smaller wire spacing-to-width ratio is shown to have a high depth sensitivity for maximum detection distances.</P>
Pulse-induction metal detector with time-domain bucking circuit for landmine detection
Bobae Kim,Jung Won Yoon,Seung-eui Lee,Seung-Hoon Han,Kangwook Kim IET 2015 Electronics letters Vol.51 No.2
<P>A novel pulse-induction (PI) metal detector (MD) is proposed to decrease the saturation time of the output voltage and increase the detection depth. The proposed MD utilises a receiver with a time-domain bucking circuit. The bucking circuit decreases the output voltage significantly without a target, so that the output voltage can be amplified more before becoming saturated. To demonstrate the performance of the proposed MD, it has been fabricated and measured. The measured output voltage shows that the saturation time is reduced and that the detection depth increases in comparison with a conventional PI MD.</P>
Kim, Seulah,Shin, Seulmee,Hyun, Bobae,Kong, Hyunseok,Han, Shinha,Lee, Aeri,Lee, Seungjeong,Kim, Kyungjae The Korean Association of Immunobiologists 2012 Immune Network Vol.12 No.5
Dioscoreae Rhizome (DR) has been used in traditional medicine to treat numerous diseases and is reported to have anti-diabetes and anti-tumor activities. To identify a bioactive traditional medicine with anti-inflammatory activity of a water extract of DR (EDR), we determined the mRNA and protein levels of proinflammatory cytokines in macrophages through RT-PCR and western blot analysis and performed a FACS analysis for measuring surface molecules. EDR dose-dependently decreased the production of NO and pro-inflammatory cytokines such as IL-$1{\beta}$, IL-6, TNF-${\alpha}$, and $PGE_2$, as well as mRNA levels of iNOS, COX-2, and pro-inflammatory cytokines, as determined by western blot and RT-PCR analysis, respectively. The expression of co-stimulatory molecules such as B7-1 and B7-2 was also reduced by EDR. Furthermore, activation of the nuclear transcription factor, NF-${\kappa}B$, but not that of IL-4 and IL-10, in macrophages was inhibited by EDR. These results show that EDR decreased pro-inflammatory cytokines via inhibition of NF-${\kappa}B$-dependent inflammatory protein level, suggesting that EDR could be a useful immunomodulatory agent for treating immunological diseases.
Kim, Seulah,Shin, Seulmee,Hyun, Bobae,Kong, Hyunseok,Han, Shinha,Lee, Aeri,Lee, Seungjeong,Kim, Kyungjae 대한면역학회 2012 Immune Network Vol.12 No.5
Dioscoreae Rhizome (DR) has been used in traditional medicine to treat numerous diseases and is reported to have anti-diabetes and anti-tumor activities. To identify a bioactive traditional medicine with anti-inflammatory activity of a water extract of DR (EDR), we determined the mRNA and protein levels of proinflammatory cytokines in macrophages through RT-PCR and western blot analysis and performed a FACS analysis for measuring surface molecules. EDR dose-dependently decreased the production of NO and pro-inflammatory cytokines such as IL-1β, IL-6, TNF-α, and PGE<sub>2</sub>, as well as mRNA levels of iNOS, COX-2, and pro-inflammatory cytokines, as determined by western blot and RT-PCR analysis, respectively. The expression of co-stimulatory molecules such as B7-1 and B7-2 was also reduced by EDR. Furthermore, activation of the nuclear transcription factor, NF-κB , but not that of IL-4 and IL-10, in macrophages was inhibited by EDR. These results show that EDR decreased pro-inflammatory cytokines via inhibition of NF-κB -dependent inflammatory protein level, suggesting that EDR could be a useful immunomodulatory agent for treating immunological diseases.
Improvement of Lyophilized Probiotics Viability Using a Histidine-based Rehydration Formula
이규연(Kyuyeon Lee),김나연(Nayeon Kim),김보배(Bobae Kim),김혜신(Hyeshin Kim),한경준(Kyoungjun Han),여지은(Jieun Yeu),Wilhelm H. Holzapfel,강혜지(Hyeji Kang) 한국유산균프로바이오틱스학회 2024 Current Topic in Lactic Acid Bacteria and Probioti Vol.10 No.1
Bacteria get stressed and damaged during freeze-drying process for commercialization and this result in loss of its effect. Viability is important for its efficacy, but this drying process can deteriorate viability by damaging the integrity of the cell membrane as well. In this study, we propose 0.03 M histidine for rehydration of freeze-dried probiotics to improve their viability. The freeze-dried bacteria mixture with 0.03 M histidine showed augmented survivability during in vitro simulated gastric and duodenum stress conditions and increased viability during 60 min rehydration. It exhibited a significantly increased adherence ability of lyophilized bacteria to the HT-29 cell-line. Therefore, this shows possibility of probiotics commercialization with damage of lyophilization restored and survivability ameliorated.
Intraoperative abortion of adult living donor liver transplantation
Jungchan Park,Gyu-Seong Choi,Mi Sook Gwak,Justin Sangwook Ko,Sangbin Han,Bobae Han,Jae Won Joh,Sung Joo Kim,Suk-Koo Lee,Choonhyuck David Kwon,Jongman Kim,Chan Woo Cho,Gaab Soo Kim 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.95 No.4
Purpose: This study aimed to report intraoperative abortion of adult living donor liver transplantation (LDLT). Methods: From June 1997 to December 2016, 1,179 adult LDLT cases were performed. 15 cases (1.3%) of intraoperative abortions in LDLT were described. Results: Among 15 cases, 5 intraoperative abortions were donor-related, and remaining 10 cases were recipient-related. All donor-related abortions were due to unexpected steatohepatitis. Among remaining 10 recipient-related intraoperative abortions, unexpected extension of hepatocellular carcinoma was related in 5 cases. Two cases of intraoperative abortions were related to bowel inflammation, and 2 cases were associated with severe adhesion related to previous treatment. One recipient with severe pulmonary hypertension was also aborted. Conclusion: Complete prevention of aborted LDLT is still not feasible. In this regard, further efforts to minimize intraoperative abortion are required.
Kim, Sol,Lee, Jungwoon,Kim, Ja Young,Lim, Bobae,Shin, Eung-Kyun,Han, Yong-Mahn,Kim, Sung-Su,Song, Jin-Ho,Kim, Jungho Wiley Subscription Services, Inc., A Wiley Company 2009 International journal of cancer: Journal internati Vol.124 No.10
<P>The EWS-Oct-4 protein is a chimeric molecule in which the amino terminal domain (NTD) of the EWS becomes fused to the carboxy terminal domain (CTD) of the Oct-4 transcription factor. It was identified in human bone and soft-tissue tumors associated with t(6;22)(p21;q12). Using in vitro and in vivo systems, we found that the EWS-Oct-4 protein self-associates. The major domains required for self-association mapped to the EWS NTD (amino acids 70–163) and the POU DNA-binding domain. EWS-Oct-4 protein also associated with EWS-Oct-4 (V351P), which contains a mutation in the POU DNA-binding domain. Using electrophoretic mobility shift assays, we found that the EWS-Oct-4 (V351P) mutant interfered with wild-type EWS-Oct-4 DNA-binding activity. In addition, we found that EWS-Oct-4-mediated transcriptional activation was inhibited by EWS-Oct-4 (V351P) protein in vivo. Thus, this mutation in the POU DNA-binding domain results in a dominant negative protein. These findings suggest that the biological functions of the EWS-Oct-4 oncogene can be modulated by the dominant negative mutant EWS-Oct-4 (V351P). © 2008 Wiley-Liss, Inc.</P>