• Bulletin of the Korean Chemical Society
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• v.8 no.5
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• pp.406-408
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• 1987

It has been shown that the distribution of relaxation times, H(ln $\tau$), in semi-logarithmic time scale can easily be calculated numerically from the derivative of the relaxation function in semilogarithmic scale. In that, ln$\tau$, the abscissa, is divided into N different segments of equal size, then H is considered to be a linear function of ln $\tau$within each segment. The technique has been applied to a Williams-Watts function as well as to the relaxation function obtained by photon correlation spectroscopy from atactic polystyrene glass. It has been demonstrated that the relaxation functions can be precisely reproduced from the calculated distribution functions.

• International Journal of Advanced Culture Technology
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• v.6 no.3
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• pp.44-52
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• 2018

The purpose of this study was to assess the effects and find the correlation of LOTCA-G and SS-QOL on the cognitive function and quality of life of elderly stroke patients. The time period of the experiment was from March 1, 2018 to March 30, 2018, and the study sample was composed of 102 stroke out-patients who participated in the rehabilitation center in G-city and received treatment of LOTCA-G and SS-QOL. The raw scores of the cognitive function of the elderly stroke patients varied depending on their gender, age, education, and marital status, but the differences were not statistically significant. Second, the raw scores of the quality of life of the elderly stroke patients varied depending on their gender, age, education, and marital status, but only marital status showed significance (p <0.01). The elderly stroke patients' cognitive function and the quality of life showed a statistically significant correlation (p <0.01). LOTCA-G and SS-QOL generally showed significant correlation even among sub-categories, but energy, one of the sub-categories of quality of life, did not show significant correlation with any of the other sub-categories of cognitive function. By combining the study results, it was possible to see that there were high levels of correlation between cognitive function and quality of life in elderly stroke patients shown through LOTCA-G and SS-QOL. Based on this study, if the raw scores of cognitive function and quality of life could be validated and various basic data could be provided for increasing quality of life, it can be considered that the stroke patients' quality of life will be improved.

• PNF and Movement
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• v.17 no.2
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• pp.303-310
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• 2019

Purpose: This study aimed to investigate the correlation between abdominal muscle strength and measures of respiratory function in stroke patients. Methods: The study participants comprised 17 (male: 12, female: 5) stroke patients hospitalized at W rehabilitation hospital in Busan, South Korea. Abdominal muscle strength was assessed using a digital manual dynamometer for 5 seconds contacting the sternal notch of the participants to bend the trunk. Respiratory function (forced vital capacity, forced expiratory volume in one second, forced expiratory volume in one second/forced vital capacity, and peak expiratory flow) was assessed using a spirometer. The collected data were analyzed using Pearson's correlation analysis, and the significance level was set 0.05. Results: A statistically significant correlation was found between abdominal muscle strength and forced vital capacity, forced expiratory volume in one second, and peak expiratory flow. However, abdominal muscle strength and forced expiratory volume in one second/forced vital capacity were not significantly correlated. Conclusion: This study demonstrated that there is a relationship between abdominal muscle strength and respiratory function. Exercise programs to strengthen the abdominal muscles are therefore necessary to improve respiratory function in stroke patients.

• Journal of Korean Public Health Nursing
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• v.23 no.1
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• pp.40-49
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• 2009

Purpose: To investigate the relationships among stress, depression, family function, and activities of daily living in elderly females. Methods: Using a descriptive correlation for the study design, data was collected from 134 elderly females older than 60 years of age. Result: The level of depression among the subjects was 6.04($\pm5.30$) and level of stress was 1.62($\pm.70$). The performance capacity of the activities of daily living was 17.79($\pm0.87$), and the instrumental activities of daily living was 22.33($\pm2.66$). The family function was 2.82($\pm3.47$). Depression and stress showed a positive correlation(p<.001) and had a negative correlation with family function(p=.025), as the correlation with instrumental activities of daily living was negatively related(p=.008). Stress had a positive relationship with family function(p<.001). and was negatively related to instrumental activities of daily living (p=.041). Conclusion: For health promotion of elderly females, it is critical to make an effort to establish and constantly develop a program, as well as policy for the health of the elderly considering and understanding gender differences.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.447-450
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• 2004

This study was conducted to characterize groundwater and river-water fluctuations at a riverbank filtration site in Daesan-myeon adjacent to the Nakdong River, using time series analysis. Water levels from six observation wells from January 2003 to October 2003 were measured. The autocorrelation analysis indicates that the wells are divided into three groups: group 1 represents strong linearity and memory, group 2 intermediate linearity and memory, and group 3 weak linearity and memory. The analysis indicates that groundwater levels in different monitoring wells vary in response to river-water levels, groundwater withdrawal and seasonal rainfall. Cross-correlation was also divided into three groups. Group 1 shows the highest cross-correlation function (0.49 - 0.54) for a lag time of 0 hours, group 2 intermediate cross-correlation function (0.34 - 0.45), and group 3 the lowest cross-correlation function (0.23 - 0.25). Different cross-correlation functions among the 3 groups are interpreted as an effect of tile distance from the river to the pumping wells.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.6
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• pp.891-897
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• 2013

The spectrum and the number of the values of the cross-correlation function between the maximal period binary sequences have been extensively studied because of their importance in communications applications. In this paper, we propose the new family of the sequences using the decimation $d=2^{m-1}(3{\cdot}2^{m}-1)$. And we find the spectrum of the cross-correlation function of the sequences and analyze the number of times each value occurs for $0{\leq}{\tau}{\leq}2^{n}-2$.

• Journal of The Korean Astronomical Society
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• v.31 no.2
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• pp.105-108
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• 1998

We have found that the two-point correlation function of the APM clusters of galaxies has an amplitude much higher than that claimed by the APM group. As the richness limit increases from R = 53 to 80, the correlation length increases from 17.5 to 28.9 $h^{-1}Mpc$. This indicates that the richness dependence of the APM cluster correlation function is also much stronger than what the APM group has reported. The richness dependence can be represented by a fitting formula ro = 0.53dc + 0.01, which is consistent with the Bahcall's formula ro = 0.4dc. We have tried to find the possible reason for discrepancies. However, our estimates for the APM cluster correlation function are found to be robust against variation of the method of calculation and of sample definition.

• Publications of The Korean Astronomical Society
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• v.30 no.2
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• pp.599-601
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• 2015

The short time scale X-ray variability associated with the accretion disk around compact objects is complex and is vaguely understood. The study of the cross correlation function gives an insight into the energy dependent behavior of the variations and hence connected processes. Using high resolution RXTE data, we investigate the dynamical cross correlation function of an observation of a black hole source XTE J1550-564 in the steep power law state. The cross correlation between soft and hard X- ray energy bands revealed both correlated and anti-correlated delays (${\leq}{\pm}15s$) on a correlation time scale of 50 s. It was noticed that the observed delays were similar to the delays between X-ray and optical/IR bands in other black hole and neutron star sources. We discuss the possible mechanisms/processes to explain the observed delays in the dynamical CCF.

• The Journal of Korean Physical Therapy
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• v.25 no.1
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• pp.16-22
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• 2013

Purpose: This study evaluated the validity of measuring paravertebral muscle function with 3D-NEWTON (Hanmed, Korea) by assessing the correlation between Biodex (Biodex, USA) and surface electromyography (EMG). Methods: Nineteen healthy adults participated. The function of their paravertebral muscle was measured in three ways. Maximum endurance time was measured in seconds when 3D-NEWTON was inclined forward for assessing extensor function, and inclined backward for assessing flexor function. Using surface EMG, maximum muscle activity was obtained from the eractor spinae and rectus abdominis during the 3D-NEWTON measurement. Maximum muscle activity was the mean activity from 10 seconds when the root mean squared firing data was highest. Through Biodex the peak torques of the extensor and flexor were measured during isometric exercises. The Spearman correlation coefficiencts from 3D-NEWTON, surface EMG, and Biodex were calculated. Results: The data from surface EMG and Biodex were statistically correlated when measured for flexor function, but less so for extensor function. In the case of 3D-NEWTON, the correlation coefficient with Biodex was 0.50 (p=0.05), while the coefficient with surface EMG was 0.53 (p=0.02) when measured for extensor function. Similarly, the correlation coefficienct with Biodex was 0.60 (p=0.01), while the surface EMG was 0.51 (p=0.03) for flexor function. Conclusion: 3D-NEWTON was a useful method for measuring paravertebral muscle function and can give helpful information for treating people with diseases associated with the lumbar spine.

• Journal of Korean Physical Therapy Science
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• v.27 no.1
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• pp.56-65
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• 2020

Purpose: Individuals affected by stroke present with changes in motor function, balance, and cognition. The purpose of this study was to the correlation between motor function, balance, and cognition in patients with stroke. Design: cross-sectional study design. Methods: 67 stroke patients in the experiment were included. For evaluation of motor function which is Manual Muscle Test, Range of Motion, Modified Ashworth Scale for spasticity, grasping power, and balance was measured using the Berg Balance Scale and Functional reach test. For evaluating Cognition which is Korean-Mini Mental State Examination. Results: The results of this study's motor function, balance, and cognition showed a significant positive correlation (p<0.05). Conclusion: The results indicated that motor function, balance, and cognition were significantly correlated with each other. Therefore, it is suggested that to improve the motor function and balance of patients with stoke, it needs to evaluate the cognition and the motor function, balance, and cognitive training should be combined.