• The Journal of Internal Korean Medicine
• /
• v.41 no.2
• /
• pp.194-203
• /
• 2020

Objectives: This study aimed to compare the gait patterns of cerebellar infarction patients with those of corticospinal tract stroke patients through a follow-up of patients with ataxic gait due to cerebellar infarction and corticospinal tract stroke. Methods: We investigated two cases of patients with cerebellar infarction and two cases each of acute or chronic corticospinal tract stroke who were hospitalized at Wonkwang University Gawangju Medical Center from September 1, 2017 to February 15, 2020 based on medical records and gait analyses. The spatiotemporal gait parameters of each patient were measured three times at 2-week intervals except those of the chronic corticospinal tract stroke patients, which were measured twice at a 1-month interval. Results: Spatiotemporal gait parameters, which include velocity, cadence, step length, stride length, and single support, were consistently increased in the cerebellar infarction patients in comparison to the corticospinal tract stroke patients. The stance phase was decreased in all the patients. Conclusions: The cerebellar infarction patients' gait spatiotemporal parameters were found to consistently improve. Moreover, gait analysis can be used to effectively measure improvement of ataxic gait.

• Wind and Structures
• /
• v.28 no.2
• /
• pp.89-97
• /
• 2019

The non-linear equations governing wind-induced internal pressures for a two-compartment building with background leakage are linearized based on some reasonable assumptions. The explicit admittance functions for both building compartments are derived, and the equivalent damping coefficients of the coupling internal pressure system are iteratively obtained. The RMS values of the internal pressure coefficients calculated from the non-linear equations and linearized equations are compared. Results indicate that the linearized equations generally have good calculation precision when the porosity ratio is less than 20%. Parameters are analyzed on the explicit admittance functions. Results show that the peaks of the internal pressure in the compartment without an external opening (Compartment 2) are higher than that in the compartment with an external opening (Compartment 1) at lower Helmholtz frequency. By contrast, the resonance peak of the internal pressure in compartment 2 is lower than that in compartment 1 at higher Helmholtz frequencies.

• Korean Journal of Materials Research
• /
• v.11 no.11
• /
• pp.965-971
• /
• 2001

The objective of this study is to investigate the characteristics - microstructure, hardness, adhesive strength and friction coefficient - of the coatings with aging - treatment after optimizing internal- plasma spraying parameters for Al-30wt%Si powder as a basic research to manufacture the cylinder block bore for Al engine composed of Al-30wt%Si alloy on Al alloy, The optimum internal-plasma spraying parameters of Al-30wt%Si alloy are summarized as follows: voltage: 37.5V, current: 160A, working distance: 25mm, gun traverse speed: 4.5mm/s, rotating speed: 518m/min. The primary Si particles grew aggressively with increasing heat-treating temperature. The hardness of the as-sprayed coating was about Hv=275 but this value was abruptly decreased with increasing heat-treating temperature. And average friction coefficient of the coating was below 0.08 after heat treatment for 48h at $175^{\circ}C$.

• Journal of the Korean Society of Safety
• /
• v.28 no.5
• /
• pp.54-60
• /
• 2013

In this study, a finite element model based on the SU/PG scheme was developed to solve shallow-water equations and the influences of parameters and internal boundary conditions on depth-averaged flow behavior were investigated. To analyze the effect of roughness coefficient and eddy viscosity on flow characteristics, the developed model was applied to rectangular meandering channel with two bends, and transverse velocities and water depth distributions were examined. As the roughness coefficient adjacent to wall increased, the velocities near the wall decreased, and the reduced velocities were compensated by the expanding mid-channel velocities. In addition, the flow characteristics around a circular cylinder were analyzed by varying the internal boundary conditions as free slip and no slip. The assignment of slip condition changed the velocity distribution on the cylinder surface and reduced the magnitude of the shear stress up to one third.

• Membrane and Water Treatment
• /
• v.10 no.5
• /
• pp.361-372
• /
• 2019

Effect of different alkane based solvents on the stability of emulsion liquid membrane was investigated using normal alkanes (n-hexane, n-heptane, n-octane and n-decane) under various operating parameters of surfactant concentration, emulsification time, internal phase concentration, volume ratio of internal phase to organic phase, volume ratio of emulsion phase to external phase and stirring speed. Results of stability revealed that emulsion liquid membrane containing n-octane as solvent and span-80 (5 % (w/w)) as emulsifying agent presented the highest amount of emulsion stability (the lowest breakage) compared with other solvents; however, operating parameters (surfactant concentration (5% (w/w)), emulsification time (6 min), internal phase concentration (0.05 M), volume ratio of internal phase to organic phase (1/1), volume ratio of emulsion phase to external phase (1/5) and stirring speed (300 rpm)) were also influential on improving the stability (about 0.2% breakage) and on achieving the most stable emulsion. The membrane with the highest stability was employed to extract acridine orange with various concentrations (10, 20 and 40 ppm) from water. The emulsion liquid membrane prepared with n-octane as the best solvent almost removed 99.5% of acridine orange from water. Also, the prepared liquid membrane eliminated completely (100%) other cationic dyes (methylene blue, methyl violet and crystal violet) from water demonstrating the efficacy of prepared emulsion liquid membrane in treatment of dye polluted waters.

• The Korean Journal of Nuclear Medicine
• /
• v.18 no.1
• /
• pp.45-53
• /
• 1984

The purpose of this study is to observe the changes of pulmonary capillary permeability and various hemodynamic parameters before and after Positive End-Expiratory Pressure(PEEP) in Adult Respiratory Distress Syndrome (ARDS). Using a canine oleic acid induced ARDS model, we measured the pulmonary capillary permeability with a slope of lung: heart radioactivity ratio, hemodynamic parameters with Swan-Ganz catheter and blood gas tensions. 1) In normal and ARDS dogs, the PEEP didn't significantly influence the slope of lung: heart radioactivity ratio. But in ARDS group the slope index was increased compaired with that of control group (p<0.05). 2) Also in ARDS group, $PaO_2$ was significantly decreased, and $PaCO_2,\;PvCO_2$, MPAP, $AaDO_2$, Qs/Qt were significantly increased compared with those of control group (p<0.05). 3) In normal dogs, the PEEP didn't influence blood pH or gas tension, $AaDO_2$, Qs/Qt, or hemodynamics. 4) In ARDS dogs, however, the PEEP significantly increased $PaO_2$ and decreased $AaDO_2$, Qs/Qt (p<0.05).

• Bulletin of the Korean Mathematical Society
• /
• v.50 no.5
• /
• pp.1441-1450
• /
• 2013

In this paper, we consider two-component Bose-Einstein condensates with an internal atomic Josephson junction in the general case, i.e., 0 < p < $\frac{2}{(d-2)^+}$. We prove existence and uniqueness results for the ground states, and obtain some properties of the ground states with large parameters.

• Proceedings of the KIEE Conference
• /
• 1989.11a
• /
• pp.388-392
• /
• 1989

In this paper, an adaptive pole-zero placement algorithm which has disturbance rejection properties is proposed. This method using the internal model principle is shown to reject the disturbances asymptotically. Furthermore, a method which reduces the number of estimated parameters is proposed. Some simulation results are given to demonstrate the performance of the algorithms.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2001.10a
• /
• pp.269-276
• /
• 2001

Tubular structures are widely used for offshore platforms and truss type structures. In this paper, nonlinear finite element analysis is used to assess the static strength of stiffened tubular T-joints subjected to compressive brace loading. This joints was modelled with and without internal ring stiffener According to variation of ring geometries, the effect of ring stiffener for T-joints are investigated. Internal ring stiffener is found to be efficient improving ultimate strength of tubular joints. Relations of ring thickness and axial strength are observed considering geometric parameters of ring stiffeners.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.57 no.3
• /
• pp.93-100
• /
• 2015

The object of this paper is to study the shear characteristics of the weathered granite soil. To this end, a series of consolidated undrained triaxial compression tests are carried out to investigate the shear parameters-cohesion and internal friction angle-for the degree of saturation and degree of weathering. From the results, it is found that the shear parameters of weathered granite soil are influenced on the degree of saturation, degree of weathering and disturbance. Especially, internal friction angle is more influenced on the upper factors than cohesion. And shear parameters are more acted on the degree of saturation than the degree of weathering in the test range. It is, therefore, recommended that must be considered the conditions of granite soil-degree of saturation, degree of weathering and disturbance etc-in case of the calculation of bearing capacity, stability analysis and other designs with shear parameters.