• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.3
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• pp.79-91
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• 1993

An analysis of flow duration characteristics of the five major rivers in Korea was conducted with extensive river flow data available. The analysis reveals that, for most river stage-gauging stations at the rivers investigated in this study, the flow duration characteristics have changed drastically at some stations after major dammings in the river basins. Streamflow variability. which is newly defined in this study as the ratio of the 2.5 percents (or 10 day) duration discharge over the 97.5 percents (or 355 day) duration one, was also reduced by the dammings. The result of the study shows that the Han and the Yeongsan rivers have relatively small flow variation, while the Seomjin and the Keum rivers have relatively large now variation, which implies that the latter two river basins need new water resources development.

• Journal of Sericultural and Entomological Science
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• v.37 no.2
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• pp.114-120
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• 1995

The effect of juvenile hormone analogue(JHA, Manina) on larval feeding duration, pupation ratio, cocoon weight, and cocoon shell weight in the present commercial parent and hybrid silkworm stocks were investigated. Topical applications of JHA on parent silkworm stocks were to prolong larval duration, but results of response on those stocks were not consistent. Especially the JHA on Jam 121, Jam 123 and Jam 138 did not play a role in larval duration, whereas that on Jam 114 was most effective in prolongation more than two days, compared with the controls. subsequent prolongation of feeding duration resulted in increase of cocoon weight and cocoon shell weight of most parent silkworm stocks, while Jam 114 showed decrease in cocoon weight and cocoon shell weight in spite of prolonged feeding duration of two days. Unlike the parent silkworm stocks, durations of feeding period in all hybrid silkworm stocks were prolonged about one day. Treatments of JHA on the hybrid stocks gave rise to increase of cocoon weight and cocoon shell weight, and especially were most effective in Sasung-jam, Eunbaek-jam and Samgwang-jam. Although treatments of JHA seemed to have no harmful effect on physiology of parent silkworm stocks as well as that of hybrid stocks, the JHA retarded pupation ratio of some parent silkworm stocks such as Jam 122, 131, 135 and 138 by about 10%.

• Health Policy and Management
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• v.34 no.3
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• pp.309-318
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• 2024

Background: Sleep disorders in menopausal women can act as a factor that lowers the quality of life. This study aims to understand the effects of mental health, such as depression, generalized anxiety disorder, and stress, on sleep duration in menopausal women to contribute to the management of their mental health. Methods: Using data from the 2021 Korea National Health and Nutrition Examination Survey, we conducted a study on 549 naturally menopausal women aged 50-64 years. We applied frequency and weighted percentages, Rao-Scott chi-square tests, and logistic regression. Results: It was found that women with a university degree or higher had appropriate sleep duration (odds ratio [OR], 0.33; p=0.004). Women with mild depression were less likely to have appropriate sleep compared to those without depression (OR, 2.13; p=0.025). Additionally, women who experienced high levels of stress were less likely to have appropriate sleep compared to those with minimal stress (OR, 2.73; p=0.041). Conclusion: Depression and stress are related to sleep duration, and these mental health issues can lead to physiological problems due to their complex experiences. Therefore, individual attention and management of mental health are crucial, and it seems necessary to develop community-based treatment and prevention strategies.

• The Journal of Pediatrics of Korean Medicine
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• v.12 no.1
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• pp.133-143
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• 1998

Myofascial pain syndrome is one of the pain syndrome resulted from myofascia which covered muscles and clinically characteristic feature by sensitive trigger point in skeletal muscles and referred pain reactivated by stimulating each trigger point. The origin of headache are local lesion such as head, chest, abdominal organ, systemic lesion with fever or in toxic state. the other factors are consciousness, personality, anxiety, depression, which cause muscle strain in physiological environment. The Oriental Medical therapy for headache has herb medication and acupuncture. especially acupuncture therapy has not only classical systemic acupuncture(體鍼) but also neo-acupuncture(新鍼) such as commonly using auricular acupuncture(耳鍼) and manual acupuncture (手鍼), recently trigger point acupuncture is used. The author analyzed 27 cases of patient with headache treated by trigger point acupuncture therapy in Dong-yu Oriental Medical Hospital from March 1st 1997 to February 28th 1998. The following results were obtained. 1. The sex ratio of the female was 59.26%(16 cases) and male was 40.74%(11 cases), the ratio of high school student was 62.96%(17cases) as first. 2. The headache duration ratio of 2-3 years was 37.04%(10 cases) as first, 1-2 years was 25.93%(7 cases) as second. 3. The portion ratio of whole headache was 33.33%(9 cases) as first, lateral headache was 29.63%(8 cases) as second 4. The combined symptoms ratio of anorexia was 40.74%(11 cases) as first, fatigue was 33.33%(9 cases) as second, neck stiffness and dizziness was each 25.93%(7 cases) as third. 5. The therapeutic duration ratio of below 1 week was 29.63%(8 cases) as first, 2-3 weeks was 22.22%(6 cases) as second, 1-2 weeks and 3-4 weeks was each 18.52%(5 cases) as third. 6. The ratio of family history was 11 cases(40.74%). mother with headache was 6 cases, father was 3 cases, and brothers & sisters was 2 cases. 7. The herb medication ratio of Chungsanggyuntongtang(淸上?痛湯) was 37.04%(10 cases), Kamiondamtang(加味溫膽湯) was 22.22%(6 cases), Hyangsapyunguisan(香砂平胃散) was 18.25%(5 cases) etc. 8. The remedial effect ratio of good was 25.93%(7 cases), fair was 48.15%(13 cases), not improved was 7.41%(2 cases), side effect was 3.70%(1 cases), and unknown was 14.81%(4 cases).

• Tuberculosis and Respiratory Diseases
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• v.39 no.4
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• pp.343-347
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• 1992

Background: There are several causes that the total destruction of unilateral lung can occur. Pulmonary tuberculosis of these causes may lead to destruction through chronic inflammation and fibrosis. In such circumstances, the left to right ratio is supposed to be different. We performed the study with 224 cases for total destruction of unilateral lung, who were admitted at National Kongju Tuberculosis Hospital for recent 4 years. Method: On admission chest film, radiologic pattern was classified into 4 types. And we analyzed patients' age, sex, duration of illness, sputum AFB smear and culture. Result: 1) The male to female ratio was 2:1 and 74% of the patients were between 31 and 60 years of age. 2) One hundred and ninety eight cases(88%) had the duration of illness over 3 years. Namely, most of patients had long history. 3) Sputum AFB smear and/or culture were positive mostly (80%). 4) As for the radiologic pattern, 181 cases (81%) had the total destroyed lung in left and partial lesion in right lung, 31 cases (14%) total destroyed lung in right and partial lesion in left lung, 11 cases (5%) total destroyed lung in left only, and 1 case total destroyed lung in right only. 5) In the radiologic pattern, there is no significant difference in terms of age, sex, duration of illness and sputum examination. Conclusion: From these results, we found that the total destruction of unilateral lung in pulmonary tuberculosis occurred generally in the left side.

• Biotechnology and Bioprocess Engineering:BBE
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• v.4 no.1
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• pp.46-50
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• 1999

The application of pulsed electric field was investigated in the crossflow ultrafiltration of BSA (bovine serum albumn) to economize the application time of electric current as well as to avoid inherent problems of long-term application of electric field. During the application of various cyclic patterns of pulsed electric current, the averaged filtration flowrate and the degree of concentration were maintained higher than those obtained in the absence of electric current application. The temperature increase, pH change, and BSA loss by electrodeposition were all negligible during the operation. The averaged filtration flowrate increased as the ON/OFF duration ratio of electric current was higher and as the period of ON/OFF cycle was shorter. The re-establishment of concentration polarization was dependent to the duration of current OFF state and, therefore, a longer duration of OFF state was not favorable in maintaining higher filtration flow rate. Although the averaged filtration flowrate was enhanced as the magnitude of electric current increased, the flowrate enhancement became smaller as the magnitude of current value above which the degree of electrokinetic depolarization is no further improved.

• Journal of Mechanical Science and Technology
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• v.17 no.10
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• pp.1475-1484
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• 2003

The EDM processing characteristics of one of the nickel-based heat resistant alloys, Hastelloy- X, were investigated under the various EDM conditions and analyzed in terms of surface integrity. This alloy is commonly used as a material for the hot gas path component of gas turbines and it is difficult to machine by conventional machining methods. The primary EDM parameter which was varied in this study were the pulse-on time. Since the pulse-on time is one of the main factors that determines the intensity of the electrical discharge energy, it was expected that the machining ratio and the surface integrity of the specimens would be proportionally dependent on the pulse-on duration. However, experimental results showed that MRR (material removal rate) and EWR (electrode wear rate) behaved nonlinearly with respect to the pulse duration, whereas the morphological and metallurgical features showed rather a constant trend of change by the pulse duration. In addition the heat treating process affected the recast layer and HAZ to be recrystallized but softening occurred in recast layer only. A metallurgical evaluation of the microstructure for the altered material zone was also conducted.

• Journal of Oriental Neuropsychiatry
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• v.9 no.2
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• pp.161-169
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• 1998

A clinical analysis was carried out for 19 patients who was treated in Dept. of Neuropsychiatry of Taejon Oriental Medicine Hospital from I aug. 1997 to 31 Jul. 1998 and was ruled out as anxiety disorder. The results were summarized as follows. 1. In the distribution of the sex, ratio between female and male was 1:2.8, distribution of the age was even each age, and the primary motive of the onset were psychological trauma, question of money, discord of a household. 2. As for the duration in disease, the duration from a week to a month had a majority of all, and the most duration of the addmission-treatment was a week. 3. The most common symptom were palpitation ·anxiety, headache·dizziness, chest discomfort, the cases of generalized anxiety disorder and atypical anxiety disorder was a large number. 4. In the aromatherapy of absorptive method, the sort of many used essential oil were Lavenda and Rosewood, in the massage, that were Peppermint and Rosemary. 5. The most used recipes were BUNSIMKIYEM(分心氣飮) HACHULBOSIMTANG(夏朮補心湯), CHUNGGANSOYOSAN(淸肝逍遙散), BANHABAEKCHUCHUNMATANG(半夏白朮天麻湯), CUIBIONDAMTANG(歸脾溫膽湯) etc. 6. In the judgement of efficacy, 9 cases showed good efficacy, 9 cases showed no change, 1 case showed excellent efficacy.

• Journal of The Korean Society of Agricultural Engineers
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• v.55 no.1
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• pp.39-48
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• 2013

The solar radiation is the primary energy source that drives many of the earth's physical and biological processes and climate change. Understanding its importance to the solar radiation observation is a key to understanding a broad range of natural processes, agricultural, energy and human activities. The purpose of this study is to estimate solar radiation using sunshine duration, and to estimate distribution of solar radiation using a topography factor considering surface slope and aspect in complex terrain. The result of regression analysis between ratio of solar radiation and sunshine duration from 2001 to 2010 shows high $R^2$ value of 0.878. Regression analyses indicated that topographic attributes including elevation, slope and aspect had significant effects on solar radiation. The variation of topographic factor with aspect and slope for the summer and winter are considered. The highest month of daily mean solar radiation at Jeju island appears in April of 20.61 $MJ{\cdot}m^{-2}{\cdot}day^{-1}$, and the lowest month appears in December of 6.90 $MJ{\cdot}m^{-2}{\cdot}day^{-1}$. These results provided useful quantitative information about the influence of topography on solar radiation in the island region.

• Journal of Nutrition and Health
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• v.26 no.1
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• pp.34-46
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• 1993

This study was performed to investigate the interrelationship between fasting serum insulin, eating behaviour, daily energy intake and the fatness in obese and non-obese women. The possibility of fasting serum insulin as potential predictive factor for eating behaviour and daily energy intake was also investigated. The results are as follows: 1) In obese women ; Subjects with higher fasting serum insulin were associated with higher speed of eating and shorter meal duration time. No association could be found between daily energy intake or the degree of obesity and fasting serum insulin. There was a significant positive correlation between obesity, daily energy intake and speed of eating. Obesity, daily energy intake were negatively related to meal duration time. Subjects with a rapid speed of eating were apt to overeat during eating behaviour experiment. Our findings suggested that a rapid speed of eating is a contributing factor to the development of obesity in obese women. 2) In non-obese women ; While subjects with higher insulin level were apt to overeat, we could not find any relation between overeating and daily energy intake. There was no correlation between eating speed and daily energy intake, but a significant positive correlation was found between meal duration time and daily energy intake. The degree of fatness was increased with the lower daily energy expenditure per body weight, or the higher waist hip girth ratio, fasting serum insulin and daily energy intake.