• The Bulletin of The Korean Astronomical Society
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• v.29 no.2
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• pp.40.2-40.2
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• 2004

• The Bulletin of The Korean Astronomical Society
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• v.28 no.1
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• pp.50-50
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• 2003

• The Korean Journal of Pain
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• v.14 no.1
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• pp.37-40
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• 2001

Background: It had been reported by authors that linear polarized infrared light radiation (Superizer: SL) near the stellate ganglion had a similar effect on the change of skin temperature of hand compared with the stellate ganglion block (SGB). We hypothesized that this was due to dilatation of vessels and an increased blood flow. The aim of this study was to measure the velocity of blood flow in peripheral vessels after linear polarized infrared light radiation near the stellate ganglion and to compare the effect of SL with that of SGB using local anesthetics. Methods: Forty patients whose clinical criteria were matched for the symptoms of SGB were selected for study. We radiated the stellate ganglion by linear polarized infrared light radiation and measured the blood flow of radial artery using Ultrasound Doppler blood flow meter before and after 10, 20 and 30 minutes post-radiation. After 3 days, SGB was performed using 8 ml of 1% mepivacaine to the same patient, and the radial artery blood flow was measured in the same manner. Results: The blood flow velocity was increased by 40% and 27% at 10 min and 20 min after SL and by 42% and 41% at 10 min and 20 min after SGB. However, there was no statistically significant difference in blood flow velocity between SGL and SGB. Conclusions: We could conclude that linear polarized radiation is a clinically simple and useful noninvasive therapeutic tool in clinical area.

• Journal of the Korean Magnetics Society
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• v.24 no.5
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• pp.146-151
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• 2014

The pulse waveforms of a carotid artery in the neck and a radial artery in the hand wrist were individually measured by using clip-type pulsimeter equipped with a permanent and Hall device. The pulse transit time and the pulse wave velocity obtained through comparison of two pulse waveforms were analyzed each other. A value of the pulse wave velocity was about 8.5 m/s similar to one measured by a conservative method. This result suggests that the clip-type pulsimeter as the reproducible and reliable one oriental diagnostic medical device can be predicted to any atherosclerosis state in the cardiac circulatory system.

• Journal of Mechanical Science and Technology
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• v.16 no.8
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• pp.1135-1143
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• 2002

The intermittent spray characteristics of the single-hole diesel nozzle (d$\sub$n/=0.32 mm) used in the fuel injection system of heavy-duty diesel engines were experimentally investigated. The mean velocity and turbulent characteristics of the diesel spray injected intermittently into the still ambient were measured by using a 2-D PDPA (phase Doppler particle analyzer) . The gradient of spray half-width linearly increased with time from the start of injection, and it approximated to 0.04 at the end of the injection. The axial mean velocity of the fuel spray measured along the radial direction was similar to that of the free air jet within R/b= 1.0-1.5 regardless of elapsing time, and its non-dimensional distribution corresponds to the theoretical velocity distributions suggested by Hinze in the downstream of the spray flow fields. The turbulent intensity of the axial velocity components measured along the radial direction represented the 20-30% of the U$\sub$cι/ and tended to decrease in the outer region. The turbulent intensity in the trailing edge was higher than that in the leading edge.

• Journal of Mechanical Science and Technology
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• v.14 no.2
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• pp.226-235
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• 2000

The performance prediction of an airfoil fan using a commerical code, STAR/CD, is verified by comparing the calculated results with measured performance data and velocity fields of an airfoil fan. The effects of inlet tip clearance on performance are investigated. The calculations overestimate the pressure rise performance by about 10-25 percent. However, the performance reduction due to tip clearance is well predicted by numerical simulations. Main source of performance decrease is not only the slip factor but also impeller efficiency. The reduction in performance is 12-16 percent for 1 percent gap of the diameter. The calculated reductions in impeller efficiency and slip factor are also linearly proportional to the gap size. The span-wise distributions of phase averaged velocity and pressure at the impeller exit are strongly influenced by the radial gap size. The radial component of velocity and the flow angle increase over the passsage as the gap increases. The slip factor decreases and the loss increases with the gap size. The high velocity of leakage jet affects the impeller inlet and passage flows. With a larger clearance, the main stream moves to the impeller hub side and high loss region extends from the shroud to the hub.

• Elastomers and Composites
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• v.33 no.2
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• pp.93-102
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• 1998

In electric cable industries, the curing extent of the rubber materials covering the electric cores gives an significant effect on their final performance. The curing extent of rubber is controlled mostly by pull-out velocity of cable in the extrusion process. The final curing extent may be different for different radial positions inside the rubber because of the non-uniform temperature distributions during the curing process. In this contribution, the prediction of curing extent distribution throughout the radial direction of rubber is represented when the cable is passing through the steam curing zone with a fixed pull-out velocity. The prediction of the optimum pull-out velocity for the desired curing extent distribution is also reported. The steady-state heat balance was developed for the curing and cooling processes in which the pull-out rubber was cured by high temperature steam and then cooled by ambient water. A few essential material properties such as density, specific heat, and thermal conductivity were measured to analyze the temperature distribution during the curing and cooling processes. The times to reach 90% curing extent at varying temperatures were measured and used to determine the final cure extent distribution inside the rubber.

• 한국연소학회:학술대회논문집
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• 2005.10a
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• pp.215-220
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• 2005

When the fuel jet velocity is smaller than coflow velocity, the trend of decreasing liftoff height of highly diluted propane lifted flame with coflow velocity is observed experimentally. To investigate the mechanism of decreasing liftoff height with coflow velocity, lifted flames in propane jet has been studied numerically. Using one-step overall reaction mechanism the liftoff heights have been calculated for four cases of coflow velocity. The simulation agrees qualitatively with experimental observation that the liftoff height decreases with coflow velocity. As coflow velocity increases, the streamlines between nozzle and lifted flame diverge in radial direction due to the difference of momentum between coflow jet and fuel jet such that the local flow velocity ahead of lifted flame base decreases resulting in decrease of the liftoff height with coflow velocity.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.1
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• pp.33.2-33.2
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• 2012

Low-ionization nuclear emission-line region (LINER) galaxies constitute a major fraction of low-luminosity AGN population in the local Universe. In contrast to Seyfert galaxies, it is theoretically expected that LINERs would not have an outflow due to their low Eddington ratio. Using Keck/LRIS spectroscopy on a nearby LINER galaxy SDSS J091628.05+420818.7, we find a significant radial velocity offset for [OIII]${\lambda}$5007 emission line as - 50 km $s^{-1}$ blueshifted compared to systemic velocity of the galaxy, while other emission lines exhibit no or little offset. The observed [OIII] velocity offset possibly indicates an outflow of gas in the LINER galaxy, and it is probable that we only detected the [OIII] velocity offset because [OIII] ionization region is closer to the accretion disk, hence, more affected by an outflow. We further investigate the [OIII] velocity offset of -4000 SDSS AGN-host galaxies to compare the strength of AGN outflow. We find that a number of both LINER and Seyfert galaxies show [OIII] velocity offset, but the fraction of LINER galaxies with velocity offset is smaller than that of Seyfert galaxies. The preliminary results imply the presence of gas outflow in LINER galaxies, although outflow strength is probably weaker compared to Seyfert galaxies.

• International Journal of Fluid Machinery and Systems
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• v.5 no.2
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• pp.49-59
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• 2012

The present study is devoted to the influence of a superposed radial inflow in a rotor-stator cavity with a peripheral opening. The flow regime is turbulent, the two boundary layers being separated by a core region. An original theoretical solution is obtained for the core region, explaining the reason why a weak radial inflow has no major influence near the periphery of the cavity but strongly affects the flow behavior near the axis. The validity of the theory is tested with the help of a new set of experimental data including the radial and tangential mean velocity components, as well as three components of the Reynolds stress tensor measured by hot-wire anemometry. The theoretical results are also in good agreement with numerical results obtained with the Fluent code and experimental data from the literature.