• Physical Therapy Korea
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• v.6 no.2
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• pp.16-31
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• 1999

The purpose of this study was to assess the fatigue in lumbar and abdominal muscles in patients with chronic low back pain compared with normal subjects using spectral analysis with mean power frequency and median power frequency. The experimental group consisted of twenty subjects who had experienced chronic low back pain for over one year after the onset day. A control group consisted of twenty normal subjects with no history of low back pain. All subjects stood in an apparatus to perform sustained contraction in the lumbar and abdominal muscles for 30 seconds with 60% maximal voluntary isometric contraction (MVIC). The resulting electromyographic (EMG) recorded time serial data were transformed into frequency serial data by Fast Fourier Transformation (FFT). The results were as follows: 1) lumbar muscles measured, the frequency change ratio of both median power frequency and mean power frequency was significantly greater for experimental group compared with control group group (p<0.05). In measured two abdominal muscles (inferior rectus abdominis, obliquus externus abdominis) except superior rectus abdominis, the frequency change ratio of both median power frequency and mean power frequency was significantly greater for experimental group compared with control group (p<0.05). 2) In all three (longissimus thoracis, iliocostalis lumborum, multifidus) lumbar muscles measured, the initial frequency value of both median power frequency and mean power frequency was significantly lower for the experimental group compared with the control group (p<0.05). In the two (inferior rectus abdominis, obliquus externus abdominis) abdominal muscles measured (superior rectus abdominis not included), the initial frequency value of both median power frequency and mean power frequency was significantly lower for the experimental group compared with the control group (p<0.05). These results suggest that in patients with chronic low back pain there is a trend for more fatigue to occur in both lumbar and abdominal muscles than in the normal control group. This would seem to suggest that in treatment programs for patients with chronic low back pain, improvement of endurance in all trunk muscles should be considered.

• Journal of Life Science
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• v.9 no.2
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• pp.231-240
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• 1999

Regular exercise is effective in preventing coronary disease such as angina pectoris and infarction, inside it can lower the blood pressure and aids in weight control and release of stress. Risk factors of arteriosclerosis is hypertension, hyperlipidemia, diabetes, obesity, physical inactivity and excessive smoking. Arteriosclerosis begins at young age worsens with age, particulary in male. For people with risk factors of arteriosclerosis, it is important to prevent arteriosclerosis-related disease with dietary, living pattern and exercise prescription. Dietary fibers promote exercise of the digestive tract and shortens the time food remains inside the digestive tract. It can prevent obesity, hyperlipidemia, arteriosclerosis and colin cancer by blocking the absorption of cholesterol. Various vegetables and sea foods are lichen unsaturated fats and prevent the absorption of cholesterol inside the digestive tract. Essential fatty acids and unsaturated fats which are contained in vegetable oils, promotes metabolism while preventing absorption. In fruits, pectin water-soluble fiber, is present and lowers the level of cholesterol. By consuming foods that low in cholesterol and saturated fats, and rich in unsaturated fats, aliomentotherapy alone can reduce the plasma cholesterol by 10~l5$\%$. For ideal exercise, it should be aerobic with intensity of 60~80$\%$ HRmax, duration of 15~60min/day. The frequancy of 3~6/week is desirable the better exercise prescription is endurance aerobic exercise. To get more effect exercise, exercise consistency is very important.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.10
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• pp.3726-3732
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• 2010

The purpose of this study was to investigate the effects of health exercise program to old Women's walking ability, depression and WHOQOL-BREF. Data were collected from April to June, 2007 from the falls experienced 70 women elderly. All subjects participated in 12 week health exercise program which was designed in order to develop walking ability. The data were analyzed using frequency, %, paired t-test. The results of this study were as followings; First, there was significant differences in the average time of chair stand (t=2.291, p=.025), one leg standing(Rt. leg)(t=2.236, p=.029), step length between before and after(t=4.015, p=.000) training of 12 week health exercise program. Second, there was non significant differences in depression(t=1.044, p=.300) but, significant differences in WHOQOL-BREF(t=3.528, p=.001). The WHOQOL-BREF in general quality of life(t=2.923, p=.005), physical(t=3.039, p=.003), psychological(t=2.481, p=.016), social(t=2.531, p=.014) and environment domain(t=4.259, p=.000) were significant differences. The results suggest that the 12 week health exercise program can improve the muscle endurance and balance, QOL.

• Journal of the Korean Society of Physical Medicine
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• v.3 no.1
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• pp.27-37
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• 2008

Purpose : Today, it enjoys a sports and a leisure where the anterior cruciate ligament(ACL) injury patient increase. The knee joint is important means of human body movement and to do an important duty when it encounters ACL injuries of the knee joint and the many restriction follows in the life which is ordinary. When it is damaged ACL, it comes to determinate that ACL reconstruction and preservation treatment that the according to condition of ligament and knee joint. After ACL reconstruction, that is the fact which already becomes known the exercise treatment advances a recovery and to reduce a sequela. Methods : we researched the method of exercise treatment after anterior cruciate ligament reconstruction operation by journal of science direct and KISS in daecu university. Results : The representative exercise treatment is isometric exercise, isokinetic exercise isotonic exercise and complex exercise but what kind of exercise treatment most is effective, it revealed and support it was not. The method of exercise treatment is very various, so It causes a confusion made to the therapist and patients. So it executes once again it sought the kinetic therapeutic method which is efficient from this research and it tried to observe preceding research after ACL reconstruction. To operation a various the exercise treatments, operation only the treatment which is general compared to it was effective in muscular power and muscle functional improvement. But this like improve despite with the exercise treatment consequence which is continuous from research of most the pain leg compares to the health leg, it appeared the discrepancy which is a muscular power, a muscular endurance and a hypertrophy muscle etc, to the health leg or before operating 100% of muscular power to having gets the many therapy time was the recovery rate. Conclusion : Therefore after ACL reconstruction, it will become the many research continuously which is improve the muscle functional and ROM of the exercise treatment method and From therapeutic site of the patients it does to memorizes knowledge in advance about ACL injuries and the application the isokinetic treatment or exercise program are the set of necessary, frequency and amusement that considers complex what kind of therapeutic exercise becomes accomplished with the patient take care of attention.

• Journal of the Korean Institute of Gas
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• v.22 no.2
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• pp.59-66
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• 2018

Using hydrogen fuel is expected to be suitable as a reciprocating internal combustion engine with heightened interest in HALE(High Altitude Long Endurance) UAV(Unmanned Aerial Vehicle). Hydrogen is hightest energy density per mass so it can continue to charge for long periods of time and have positive part of the environmental effects. However, it is estimated that there is less research on hydrogen fuel engine currently applied, and many studies need to be done. Depending on the operation, there are factors that result in supercooling due to reduced radiation or reduce cooling performance due to low air density. Therefore, the experiment was to change the temperature of the cooling water and investigate the effect on engine combustions. The limitation of the stable operation range due to backfire is dominated by the excess air ratio rather than the effect of the cooling water temperature change. When the cooling water temperature increases, the volumetric efficiency decreases and the torque decreases. As the cooling water temperature decreases, the heat loss was increased and consequently the thermal efficiency was decreased.

• The Journal of Korean Academic Society of Nursing Education
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• v.5 no.2
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• pp.359-375
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• 1999

This is a survey in order to provide basic information about menstrual pain management and dysmenorrhea management. Menstrual pain means low abdominal cramps during menstruation and dysmenorrhea means low abdominal pains, and other symtoms as lumbago, fatigue, G-I symptoms, etc. The purposes of this study were (1) to measure the menstrual pain and dysmenorrhea, (2) to determine factors influenced to them, and (3) to know self-management method for them of college students. The subject of this study consisted of 312 college students Data were collected by questionnaire which was to measure the menstrual pain(Visual Analogue Scale(VAS), dysmenorrhea (dysmenorrhea scale) and general informations from May to June, 1999. The results of this study were as follows ; (1) Mean age for subjects was 19.4 yrs, their height was 161.4Cm, weight, 50.9Kg, menarcheal age, 13.5yrs, menstural period, 30.1 days, and menstrual duration was 5.6 days. Most respondents replied that their menstrual bleeding was moderate (72.1%) and occured regularly(55.4%). (2) Mean menstrual pain was 5.20. Menstrual pain didn't be occured 17.4 % of respondents, periodically 46.0%, and intermittently 36.6%, most commonly beginning the first day of menstruation (3) Chief management method was endurance (40.4%), use of analgesics (29.5%) and bed rest(16.5%). (4) Factors influenced to menstrual pain were analgesics use, heavy bleeding, time of menstrual pain, life change during menstruation. (5) Most symptoms of dysmenorrhea were low abdominal pain(22.2%), lumbago (15.9%), fatigue(9.0%). (6) Factors influenced to dysmenorrhea were anlgesics use and menstrual pain. (7) By Pearson's correlation analysis, there was a significant correlation between menstrual pain and menarcheal age, menstrual period. menstrual duration. But there was no correlation between menstrual pain and height, weight (8) By Pearson's correlation analysis, there was a significant correlation between dysmenorrhea and menstrual period But there was no correlation between menstrual pain and menarcheal age, menstrual duration, height, weight The results demonstrate the importance of development and clinical trial of nursing intervention on menstrual pain and dysmenorrhea.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.12
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• pp.277-284
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• 2013

The analysis of phase synchronization characteristics from EEG signals is important for the understanding of information processing functionality in the brain network. In this paper, wavelet transformation(WT), Hilbert tansformation (HT), complex demodulation (CD) methods having time localization characteristics were applied to real evoked potential data and noise added simulation data with center frequencies corresponding to EEG bands for the estimation performance analysis of phase offset, phase changing point, and interband crosstalk. The WT is the best both in ${\delta}$, ${\theta}$, and ${\alpha}$ band signal decomposition, and in analyzing phase synchronization performance. The CD can be efficiently used in changing point detection under tolerant noise condition because of its abrupt performance degradation over noise endurance level. From experimental observations, the WT is the most suitable in phase synchronization application of EEG signal, and the CD can be affordable in restricted application such as changing point detection for higher bands than ${\delta}$. Particularly, WT and CD can be used to detect the changing instant of brain function by indirectly estimating the phase changing point.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.9
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• pp.54-62
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• 2015

Although NAND flash-based SSD (Solid-State Drive) provides superior performance in comparison to HDD (Hard Disk Drive), it has a major drawback in write endurance. As a result, the lifetime of SSD is determined by the workload and thus it becomes a big challenge in current technology trend of such as the shifting from SLC (Single Level Cell) to MLC (Multi Level cell) and even TLC (Triple Level Cell). Most previous studies have dealt with wear-leveling or improving SSD lifetime regarding hardware architecture. In this paper, we propose the optimal configuration of host I/O stack focusing on file system, I/O scheduler, and link power management using JEDEC enterprise workloads in terms of WAF (Write Amplification Factor) which represents the efficiency perspective of SSD life time especially for host write processing into flash memory. Experimental analysis shows that the optimum configuration of I/O stack for the perspective of SSD lifetime is MinPower-Dead-XFS which prolongs the lifetime of SSD approximately 2.6 times in comparison with MaxPower-Cfq-Ext4, the best performance combination. Though the performance was reduced by 13%, this contributions demonstrates a considerable aspect of SSD lifetime in relation to I/O stack optimization.

• The Journal of Engineering Geology
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• v.30 no.2
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• pp.185-198
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• 2020

High-density rapid expansion material is a method that increases the solid volume of injection materials due to hydration and foam reactions at the same time as spraying. It is an effective method for securing ground stability, restoring subsidence, and loading during construction of structures. In this regard, through the mechanical experiments of injection materials, the stability of the foundation ground of the structure and the effect of increasing the endurance using site construction were analyzed. The results of the experiment showed that the unit weight of soil decreased by 10.5% after injection of the filling material, and the allowable support for the structure was deemed safe, and the subsidence by each section after ground improvement was determined to be safe at 2.28, 1.55 and 0.46 cm, respectively, with an acceptable subsidence of less than 5 cm. After the field test, five inclinometers were installed on the top floor of the target building to measure the displacement of the X and Y axes. As a result of the measurement, no displacement related to the phenomenon of inequality or subsidence cracks of the structure was measured for about 16 months (509 days) after construction. This can be judged to be a sufficient increase in the stability of the ground after the injection of rapid expansion.

• Food Science and Biotechnology
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• v.15 no.1
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• pp.63-69
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• 2006

The primary objective of this study is to determine whether a diet supplemented with brown rice koji (BRK) results in a reduced stress response in rats and mice. BRK, which has been suggested as a candidate for use as a stress- and fatigue-fighting supplement, was compared with red ginseng extract (RG) for its stress-reducing potential. The animals in this study were divided into no-stress, stress, RG, and BRK groups of 8 to 10 animals each. Stress was induced by means of immobilization (being restrained in plastic tubes for 30 min and electroshock (0.5 mA in mice or 2 mA in rats for 5 min). The no-stress group was not exposed to stress. Rats in the RG group received oral doses of 200 mg RG extract/kg body weight daily. The BRK group was fed a 30% BRK diet and exposed to stress. Animals were given supplements for 7 days before being exposed to stress, and then were given supplements for 5 days with exposure to stress. When the stress exposure ended, the animals were observed for stress-related changes in behavior and their plasma corticosterone levels were measured. BRK supplementation was associated with a partial blockade of the effects of stress on locomotion and elevated plus-maze test results in rats and mice. It was also associated with a partial reduction in stress-induced behaviors such as freezing, burrowing, smelling, face-washing, and rearing. BRK supplementation did not have a significant effect on plasma corticosterone levels, which were increased in the animals exposed to stress (p<0.01). The mice in the RG group received RG in water (2 mg RG/ mL $H_2O$), and the BRK group received a 30% BRK diet (weight) for 7 days. Both groups were evaluated for signs of fatigue. BRK supplementation increased endurance, as indicated by time on the rota-rod, in cold water, and on the horizontal wire. These results suggest that BRK supplementation partially protects the animal from the effects of stress and may also contribute to resistance to fatigue on physical exertion.