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Search Results: 1 - 10 of 8688 matches for " Tae-Kyou Park "
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A Forensic Logging System Based on a Secure OS.
Ilkyeun Ra,,Tae-Kyou Park
International Journal of Computer Science & Applications , 2009,
Effect of Insulated Oblique Plates on Heat Transfer and Recirculating Flow in a Channel  [PDF]
Yinxiao Zhan, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.26048

Flow and heat transfer characteristics of a channel with oblique plates which are mounted periodically on the channel wall have been numerically investigated in a laminar range. The main objective of the present study is to find the effect of the tilt angle of oblique plate on pressure drop and heat transfer characteristics in unsteady states. To get the different conditions of the heat transfer and flow evolution, two key parameters of the Reynolds number and the tilt angle of oblique plate are considered. At Re=200,600, the tilt angles are changed for the range of 50° - 130°. The computational results show that the heat transfer and pressure drop are strongly dependent on the tile angle and Reynolds number. When the flows are unsteady, the tilt angle has an important role in the heat transfer enhancement. Oscillatory structures induce the better mixing of the thermal field and promote the wall heat transfer. For a constant plate length, the wall heat trans- fer is maximized near the 90° - 100°. This is strongly coupled with the variations of flow mixing induced by the oblique plate.

Unsteady Flows Characteristics in a Channel with Oblique Plates  [PDF]
Yinxiao Zhan, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.38119

Unsteady flows in a channel with oblique plates have been numerically investigated. The oblique plates as disturbance promoters are installed at the upper wall. Unsteady characteristics are examined for Re = 350 and the plate angles of a = 60- 120. The flow fields represent three-dimensional features variously as the plate angle varies. From frequency analysis, it is noted that the disturbed flow by the oblique plates has peculiar unsteady modes. As the flow is more unstable, multiple frequencies are appeared.

Effect of Inlet Velocity on the Crude Oil Coking and Gas Phase Formation in a Straight Pipe  [PDF]
Dahmani Fouzia, Tae Seeon Park
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.51003
A comparative numerical study is conducted to evaluate the effect of inlet velocity on the gas-liquid-solid phase change, the separation of phases and the coke formation. The numerical procedure is constructed within the Eulerian framework in which the liquid phase is treated as a continuous phase while gas and solid are both considered as dispersed phases. The simplified reaction net of crude oil is used in order to predict the thermal cracking of the crude oil. The temperature distribution, flow field, liquid–gas phase separation, and coke formation are predicted and discussed for different inlet velocities. The information predicted by the CFD model can be utilized in the optimal design of industrial fired furnaces.
Effects of Noncircular Inlet on the Flow Structures in Turbulent Jets  [PDF]
Won Hyun Kim, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.16008

Turbulent jet flows with noncircular nozzle inlet are investigated by using a Reynolds Stress Model. In order to analyze the effects of noncircular inlet, the cross section of inlet are selected as circular, square, and equilateral triangular shape. The jet half-width, vorticity thickness, and developments of the secondary flow are presented. From the result, it is confirmed that the secondary flows of square and equilateral triangular nozzle are more vigorous than that of the circular jet. This development of secondary flows is closely related to the variations of vortical motions in axial and azimuthal directions.

Do Birth Season and Sex Affect Adult Lung Function as Early Life Factors?  [PDF]
Tae Beom Kim, I-Nae Park
Health (Health) , 2017, DOI: 10.4236/health.2017.92015
Abstract: Objectives: Although lung function decline is a normal ageing process, it can be potentiated by risk factors. However, the potential impact of early life factors on lung function decline has been scarcely studied. The aim of this study was to investigate the potential correlation between birth season and adult lung function. Methods: We enrolled 1008 South Korean patients (530 men and 478 women; age range, 40 - 80 years) who were hospitalized for urological surgery, irrespective of respiratory disease. All patients underwent the pulmonary function test before any surgery or procedure. Based on their birth season, the patients were divided into two groups (spring, summer, and fall vs. winter). Results: Forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and FEV1 % predicted of men born in winter were lower than those of men born in other seasons. Univariate and multivariate analyses using linear regression models also showed that birth season was a significant predictive factor for FVC, FEV1, and FEV1 % predicted in men. However, birth season was not correlated with lung function in women. Among male ever-smokers, FEV1 and FEV1 % predicted were lower for men born in winter than for those born in other seasons. Conclusions: Unlike women, men born in winter had lower lung function than did men born in other seasons. These results suggest that birth season might be an early life factor that predicts airway function. Furthermore, birth season has different effects on adult lung function depending on the patient’s sex.
Evaluation of Heavy Rainfall Model Forecasts over the Korean Peninsula Using Different Physical Parameterization Schemes and Horizontal Resolution

Jeong-Gyun PARK,Dong-Kyou LEE,

大气科学进展 , 2011,
EFT for electroweak processes of light nuclei
Tae-Sun Park
Physics , 2003, DOI: 10.1016/j.nuclphysa.2004.03.062
Abstract: Recently we succeeded to make a reliable EFT prediction in a totally parameter-free manner for the $S$ factors for the solar $pp$ and $hep$ processes, $p+p\to d + e^+ +\nu_e$ and $\He3+p \to \He4 + e^+ + \nu_e$. The strategy used in there is to embed a highly sophisticated standard nuclear physics approach (SNPA) exploiting realistic potentials into an EFT framework, that we refer to as EFT*. Up to next-next-to-leading order in chiral expansion, it turnes out that there is effectively only one counter-term relevant to this process, the coefficient of which -- ($\hat d^R$) -- has been renormalized to reproduce the experimental value of the tritium-beta decay. Our study has also led to {\em very} accurate EFT calculations on two-body weak processes that also receive contributions from the $\hat d^R$ term, $\mu-d$ capture rate, and $\nu-d$ scattering cross section.
Effective Field Theory for Low-Energy np Systems
Tae-Sun Park
Physics , 1998,
Abstract: The properties of low-energy neutron-proton systems are studied in an effective field theory where only nucleons figure as relevant degrees of freedom. With a finite momentum cut-off regularization scheme, we show that the large scattering lengths of the np systems do not spoil the convergence of the effective field theory, which turns out to be extremely successful in reproducing, with little cut-off dependence, the deuteron properties, the np 1S0 scattering amplitude and most significantly, the M1 transition amplitude entering into the radiative np capture process.
Effect of Hole Size on Flow Structure and Mixing Characteristic in a Multi-Hole Baffled Micro Combustor  [PDF]
Won Hyun Kim, Young Su Park, Seon Myeong Park, Tae Seon Park
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.51002
Flow structure and mixing properties by the baffle shape are numerically studied for a baffled micro combustor. The baffle shape is changed by various fuel and hole sizes. The numerical simulations based on different geometric conditions are performed by using the Reynolds Stress Model. The fuel-air mixing is greatly affected by flow recirculations. The centrally located flow recirculation has an important role for the entire mixing performance. The results show that this feature depends on the baffle configurations, and the baffle with small air holes represents efficient characters.
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