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ROTATION OF THE NGC 1333 IRAS 4A2 PROTOSTELLAR JET
Choi, Minho,Kang, Miju,Tatematsu, Ken'ichi IOP Publishing 2011 ASTROPHYSICAL JOURNAL LETTERS - Vol.728 No.2
<P>The bipolar jet of the NGC 1333 IRAS 4A2 protostar shows a velocity gradient in the direction perpendicular to the jet axis. This lateral velocity gradient can be seen throughout the jet imaged in a silicon monoxide line, 2500-8700 AU from the driving source, and is consistent with the rotation of the accretion disk. If this gradient is caused by the rotation of the jet around its axis, the average specific angular momentum is about 1.5 x 10(21) cm(2) s(-1). Comparison of the kinematics between the jet and the disk suggests that the jet-launching region on the disk has a radius of about 2 AU, which supports the disk-wind models. The angular momentum transported away by the jet seems to be large enough for the protostar to accrete matter from the disk, confirming the crucial role of jets in the early phase of the star formation process.</P>
WATER AND METHANOL MASER ACTIVITIES IN THE NGC 2024 FIR 6 REGION
Choi, Minho,Kang, Miju,Byun, Do-Young,Lee, Jeong-Eun IOP Publishing 2012 The Astrophysical journal Vol.759 No.2
<P>The NGC 2024 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. 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. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km s(-1) day(-1). 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 suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n.</P>
Induction of apoptosis by deinoxanthin in human cancer cells.
Choi, Yong-Ji,Hur, Jung-Mu,Lim, Sangyong,Jo, Minho,Kim, Dong Ho,Choi, Jong-Il Potamitis Press 2014 Anticancer research Vol.34 No.4
<P>Deinoxanthin is unique carotenoid isolated from the radioresistant bacterium Deinococcus radiodurans. In the present study, the induction of apoptosis of cancer cells by deinoxanthin was investigated.</P>
Minho Lee,Yurim Jeong,Man-Young Choi,Mun-Il Ryoo 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
In many cases over the years, we failed to forecast accurately outbreak of Rice stripe virus (RSV) disease using population density of overwintering small brown planthopper (SBPH), Laodelphax striatellus. What is the source of error in this viral disease assessment? For answering the question, spatial distribution of RSV in paddy fields was investigated in relation to the yield of rice grain, and the population density of overwintering SBPH in ridge of paddy fields. Total 14 paddy fields in 5 regions were surveyed in June, 2008. Disease assessment was carried out with each of 30 rice plants in the one of the borders, 5th, 10th line from ridge, and 90 rice plants in diagonal line for conventional method. The ears of rices from 18 plants in the same surveyed line were collected in the late of August for the weights of 100 rice grains. The infection rate of RSV was decreased by the distance from ridge; on the contrary, the increase tendency was shown in the yield of rice grains in the middle of paddy field. It is suggested that the border effect of viral distribution between ridge and paddy field is caused by the spatial distribution of the vector insect. Thus, in this case, the narrow border effect could represent that the SBPH migrated short distance from the ridge to paddy field. The conventional method, observing the disease in middle area of diagonal line, showed no correlation to the population density of overwintering vector generation in ridge. It might cause underestimation of the regional disease rate. The counting of RSV-diseased plant in border line only overestimated it also. However, the RSV infection rate in the near border had highly positive linear relationship (R2=0.91) to the regional average values by regression analysis. Therefore, the near border sampling method can improve the RSV disease risk assessment.
3D Macroporous Graphene Frameworks for Supercapacitors with High Energy and Power Densities
Choi, Bong Gill,Yang, MinHo,Hong, Won Hi,Choi, Jang Wook,Huh, Yun Suk American Chemical Society 2012 ACS NANO Vol.6 No.5
<P>In order to develop energy storage devices with high power and energy densities, electrodes should hold well-defined pathways for efficient ionic and electronic transport. Herein, we demonstrate high-performance supercapacitors by building a three-dimensional (3D) macroporous structure that consists of chemically modified graphene (CMG). These 3D macroporous electrodes, namely, embossed-CMG (e-CMG) films, were fabricated by using polystyrene colloidal particles as a sacrificial template. Furthermore, for further capacitance boost, a thin layer of MnO<SUB>2</SUB> was additionally deposited onto e-CMG. The porous graphene structure with a large surface area facilitates fast ionic transport within the electrode while preserving decent electronic conductivity and thus endows MnO<SUB>2</SUB>/e-CMG composite electrodes with excellent electrochemical properties such as a specific capacitance of 389 F/g at 1 A/g and 97.7% capacitance retention upon a current increase to 35 A/g. Moreover, when the MnO<SUB>2</SUB>/e-CMG composite electrode was asymmetrically assembled with an e-CMG electrode, the assembled full cell shows remarkable cell performance: energy density of 44 Wh/kg, power density of 25 kW/kg, and excellent cycle life.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-5/nn3003345/production/images/medium/nn-2012-003345_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3003345'>ACS Electronic Supporting Info</A></P>
Wearable Device-Based System to Monitor a Driver’s Stress, Fatigue, and Drowsiness
Choi, Minho,Koo, Gyogwon,Seo, Minseok,Kim, Sang Woo IEEE 2018 IEEE transactions on instrumentation and measureme Vol.67 No.3
<P>This paper proposes a wearable device-based system to monitor the abnormal conditions of a driver, including stress, fatigue, and drowsiness. The system measures the motional and physiological information of the driver using the developed wearable device on the wrist. Preprocessing is used to distinguish the valid signal parts of the measured signals, because various noises can occur in wearable sensors. Features are extracted from the signal parts, and an optimal feature set is determined by an analysis of variance and a sequential floating forward selection algorithm. To classify the driver’s state, a support vector machine-based classification method is used to obtain high generalization performance considering interdriver variance. Experiments were conducted on an indoor driving simulator, with 28 subjects, to gather data for each state. The classification accuracy was 98.43% for fivefold cross validation on the data. In a subject-independent test, the accuracy was 68.31% for the four states and 84.46% for the three states consisting of normal, stressed, and fatigued or drowsy states. Using the proposed system, the abnormal conditions of the driver can be detected and distinguished. This advantage contributes to safer and more comfortable driving. Furthermore, the utilization of the wearable device makes the system easy to use.</P>
OBSERVATIONS OF CO J = 2 $\to$ 1 AND 3 $\to$ 2 LINES TOWARD EXTREMELY HIGH VELOCITY OUTFLOWS
CHOI MINHO The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
We observed CO J = 2 $\to$ 1 and J = 3 $\to$ 2 lines toward several star formation regions with extremely high velocity (EHV) outflows: W3 IRS5, W28 A2, GL2591, S140, and Cepheus A. The full width of the wings are 90-235 km $s^{-1}$. Some wings show clear break of slope in the line profile implying that the nature of the EHV outflow is different from that of the high velocity outflow. We suggest that the EHV CO wing emission is tracing CO molecules in the stellar wind or jet which drives the high velocity outflow.