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Water and Methanol Maser Observations toward NGC 2024 FIR 6 with KVN
최민호,강미주,변도영,이정은,Choi, Minho,Kang, Miju,Byun, Do-Young,Lee, Jeong-Eun 한국천문학회 2012 天文學會報 Vol.37 No.2
NGC 2024 FIR 6 is a star formation site in Orion and may contain a hypercompact H II region, FIR 6c, and a low-mass protostar, FIR 6n. The FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz, using KVN in the single-dish telescope mode. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n while one component was associated with FIR 4, another young stellar object in the 22 GHz beam. A typical life time of the water-maser velocity-components is about 8 months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km/s/day. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers did not show a detectable time-variability. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n.
조현병 환자를 대상으로 시행한 Oddball Paradigm 중 표준자극에 대한 뇌파 반응의 시간-주파수 분석: 예비연구
최민호(Minho Choi),이미경(Migyung Lee) 대한신경정신의학회 2021 신경정신의학 Vol.60 No.4
Objectives This study examined the responses to standard stimuli to investigate the mechanisms underlying mismatch negativity (MMN) impairments in schizophrenia. Methods We obtained MMN data from 68 patients diagnosed with schizophrenia or schizoaffective disorder and 38 healthy controls and analyzed the electrophysiological activity of the responses to two standard stimuli before deviants using time-frequency methods. Results As a result of RM ANOVA at evoked alpha power, there were differences not only between- subjects (F1,104=4.35, p<0.05) but also within-subjects (F1,104=8.62, p<0.01) without groupby- stimulus interaction (F1,104=1.70, p=0.20). But at single-trial alpha power, there was a difference not between-subjects (F1,104=3.81, p=0.054), but only within-subjects (F1,104=10.14, p<0.01) with significant group-by-stimulus interaction (F1,104=5.71, p<0.05). Moreover, between-group differences were significant in evoked alpha power (t104=2.02, p<0.05, d=0.41) and single-trial alpha power (t104=2.49, p<0.01, d=0.50) to standard stimuli presented not at the first instance but second. According to the order that the two standards presented, there were increases of evoked alpha power (t37=-2.54, p<0.05, d=0.58) and single-trial alpha power (t37=-3.41, p<0.01, d=0.78) in only the healthy controls. The positive correlations were shown in clinical features between years of education completed and event-related potential amplitude at 100 ms to both standard stimuli (Each Pearson Corr.: r=0.22, p<0.05). Conclusion These outputs suggest that the P1 alpha oscillation to standards is associated with deficits in the inhibitory control of selective attention relative to cognitive dysfunction in schizophrenia. We could also hypothesize that these deficits are involved in computing prediction errors based on the predictive coding perspective. However, further studies on this hypothesis are necessary.
N-아릴-3-페닐프로판아마이드 유도체 합성 및 NF-κB 저해 활성
최민호(Minho Choi),김영수(Youngsoo Kim),정재경(Jae-Kyung Jung),이희순(Heesoon Lee) 대한약학회 2015 약학회지 Vol.59 No.2
A series of N-substitutedaryl-3-phenylpropanamide derivatives were synthesized and their inhibitory activities on LPS-induced NF-κB transcriptional activity on RAW 264.7 cells were evaluated. Cl substituted derivatives (1e, 1f) have shown more potent activities than parent hit compound KL-1156.