• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.3
• /
• pp.1-9
• /
• 2020

Acritical function of a nation is to protect its people's lives and properties from natural disasters such as a drought. A drought affects many aspects of human life, including social, economic, and industrial activities. Approximately 75.7% of reservoirs in Korea are over 50 years old.Sedimentation over the years may have caused a situation where storage capacity of the reservoirs is no longer sufficient and compliant with the original reservoir specifications. This study analyzes storage capacities for ten aged reservoirs using the autonomous navigation USV. It compares these capacities with sediment estimated by conventional empirical equations. Comparisons were made to the original specifications for the reservoirs.Storage capacity of six reservoirs decreased in a range between 16.2%-55.3% and storage capacity of 4 reservoirs increased in a range between 1.5%-380.2%. This data was compared to data derived from estimating sediment by empirical equations. Yoon's equation(1982) appeared more accurate than Sur's equation(1988) in Uhlinzi and Yongpo reservoirs, and Sur's equation(1988), however, appeared more accurate than Yoon's equation in Daegok, Ugok2 and Ochi reservoirs. The significant ranges of sedimentation shown in this study suggest that it is worth continuously surveying reservoirs to ensure their efficient management and operation.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.9
• /
• pp.440-449
• /
• 2020

This study examined the effects of laughter therapy in the elderly with degenerative arthritis who had joint pain, joint dysfunction, and depression. Through a single-blind, randomized assignment, an experimental group of 26 subjects and a control group of 26 subjects were recruited among the elderly with degenerative knee arthritis, who were over 65 years of age. From January 8 to March 11 of 2019, a total of 16 laughter therapies were administered two times a week, 60 minutes per session, in eight weeks. The pain threshold (p=.012) and joint function status (p<.001), which represents the pain, joint stiffness, and physical function, and depression (p<.001), in the experimental group improved after the eight weeks laughter therapy compared to the control group. Laughter therapy is a therapeutic intervention that can be delivered through physical or intellectual activities. This therapy is a non-invasive procedure and has the advantage that nurses can practice easily with a little training. It can be used as an intervention within community and clinical settings to relieve pain and improve depression in the elderly with arthritis.

• Korean Journal of Cognitive Science
• /
• v.14 no.2
• /
• pp.49-56
• /
• 2003

In this article, we investigate some structural properties of head-internal relative clauses in Korean and their development in Korean-speaking children. In this study, we found head-internal relative clauses in Korean has a more limited domain than head-external relative clauses with respect to positions that can be relativized and clause boundaries that the head can move across: in head-internal relative clauses, only a subject or an object can be relativized and doubly embedded clause constitutes a barrier to the movement of the head. We also found that head-internal relative clauses are easier to understand and produce than head-external relative clauses. In addition, we found that head-internal relative clauses emerge earlier than head-external relative clauses in the acquisition of relative clauses in Korean. The preference of young children (aged 4 and 5) for head-internal relative clauses over head-external relative clauses suggests that children like to use head-internal relative clauses at an early developmental stage when they have difficulty in using head-external relative clauses.

• The Journal of the Korea Contents Association
• /
• v.15 no.6
• /
• pp.303-313
• /
• 2015

Purpose: The purpose of this study was to investigate the effect of education and counselling-based cardiac rehabilitation program on cardiovascular risk, health behavior and quality of life in elderly with coronary artery disease. Methods: A quasi-experimental study used a non-equivalent control group pre-post test design. A five week education and counselling-based cardiac rehabilitation program for the elderly with coronary artery disease was developed and offered to the experimental group. Participants were drawn from hospital in Busan. Twenty two were selected for the experimental group while 22 were assigned to a control group. Cardiovascular risk, health behavior and quality of life were measured. Results: There was a statistically significant difference in the cardiovascular risk(U=118.5, p=.002), health behaviors(t=5.200, p=<.001) and quality of life(t=2.431, p=.001) between the experimental group and the control group. Conclusion: Education and counselling-based cardiac rehabilitation program can be not only an effective nursing intervention for old patients having coronary artery disease, but also the very basis of further research on aged people who have the same symptom.

• The Journal of the Korea Contents Association
• /
• v.10 no.4
• /
• pp.424-432
• /
• 2010

The purpose of this study was to analyse relationship between leisure sports' activities among older adults on activities of daily living and successful aging. For accomplish this purpose of study, the survey questionnaires were used to collect data. This study firstly set up the population as the Korean elderly who were aged over 65 and living at Seoul as of 2009, 300 persons were chosen by sampling. The numbers, used in actual analysis is leisure sports' activities participant 162, non participant 128. total 300. The statistics method utilized in this study for analyzing the collected data were ANCOVA analysis, multiple regression analysis, path analysis. Activities of daily living reliability is $\alpha$=.876 above and successful aging reliability is $\alpha$=.807 above. The conclusions of this study were as being follows. First, according to the experience of in leisure sports' activities of older adults, it was not difference between the activities of daily living. Secondly, the experience of in leisure sports' activities of older adults had positive effect on successful aging. Thirdly, more intensity of in leisure sports' activities of older adults, had positive effect on instrumental activities of daily living. Fourth, more frequency and intensity of in leisure sports' activities of older adults, had positive effect on social successful aging, more frequency and period(time) of participated in leisure sports' activities of older adults, had positive effect on psychological social successful aging. Finally, the degree of in leisure sports' activities of older adults, had direct or indirect positive effect on activities of daily living and successful aging.

• Journal of Korean Ophthalmic Optics Society
• /
• v.10 no.1
• /
• pp.53-61
• /
• 2005

In this study, we measured Near Point of Convergence(N.P.C) tests, Phoria tests using Von Grafe method and relative convergence tests on 138 men and 162 women, so a total of 300 subjects aged between 8~45 to examine the improvement of the fusion vergence through visual training and obtained as follows. 1. According to the results, the near point of convergence of 57 (19%) subjects were shorter than 7cm, and 243 (81%) were 7cm or longer, having a problem in convergence. After visual training, the number of subjects have the value shorter than 7 cm increased from 57 to 111 (37%), and the number of those have the value 7cm or longer decreased significantly form 243 to 189 (63%). 2. The results of the measure of lateral Phoria at far distance by Von Grafe method showed orthophoria 18 (6%), exophoria 198 (66%), esophoria 84 (28%). After phoria test, we examined the N.R.C and P.R.C test. The results showed that the hope finger was improved after V.T using B.l, B.O card. 3. The results of the measure of lateral Phoria at near distance by Von Grafe method showed orthophoria 6 (2%), exophoria 222 (74%), esophoria 72 (24%). After phoria test, we examine the N.R.C and P.R.C test. The results showed that the hope finger was improved after V.T using B.I, B.O card.

• Journal of Korean Ophthalmic Optics Society
• /
• v.17 no.3
• /
• pp.279-284
• /
• 2012

Purpose: We measured the amplitude of accommodation using the push-up and push-away tests and near point of convergence (NPC) and investigated the accommodative insufficiency (AI) and convergence insufficiency (CI) in elementary school children of 12~13 years old. Methods: 88 students who aged 12~13 $12.63{\pm}0.51$ years old with more than 1.0 spectacle best corrected visual acuity were examined using push-up and push-away tests. The break and recovery points of NPC also were measured. Results: Mean amplitudes of accommodations using push-up and push-away tests were $11.52{\pm}2.50D$ and $10.06{\pm}1.97D$, respectively in right eye (P<0.001). Mean break and recovery points in NPC were $8.66{\pm}1.99cm$ and $10.98{\pm}2.06cm$. AI and CI showed 28.75% and 30.00% each. 48.75% was within normal range in both amplitudes of accommodations according to their age expected and convergence. Students having both AI and CI were 7.50%. Conclusions: A high correlation between the push-up test and push-away test was found in elementary school children (r=0.6025; P<0.05). Students having normal amplitude of accommodation by their age expected and normal convergence were 71.25% and 70.00%, respectively.

• Journal of Korean Ophthalmic Optics Society
• /
• v.19 no.1
• /
• pp.105-109
• /
• 2014

Purpose: To compare the change of visual acuity and NIBUT after watching smart-phone in 1 hour under low intensity of illumination. Methods: 50 subjects (male 22, female 28) aged 20's years old ($20.7{\pm}2.4$ years) who do not have eye disease and have a good eye condition were participated for this study. Objective refraction, corrected distance visual acuity and NIBUT were measured before and after watching smart-phone (Galaxy 2, Samsung, KOREA) under low intensity of illumination (0 lx.) Objective refraction was carried out using auto-chart project (CP-1000, Dongyang, Korea), phoropter (VT-20, Dongyang, Korea) and auto refractor-keratometer (MRK-3100, Huvitz, Korea). Results: Refractive error was changed from $-3.20{\pm}2.00$ D to $-3.38{\pm}2.00$ D (p=0.006) and corrected distance visual acuity was changed from $0.93{\pm}0.08$ to $0.91{\pm}0.10$ (p=0.000) and NIBUT was changed from $10.48{\pm}7.00$ seconds to $10.29{\pm}6.47$ seconds (p=0.761) before and after watching smart-phone under low intensity of illumination. Conclusions: Continuous watching smart-phone under low intensity of illumination lead to temporal change of distance visual acuity and suitable rest may reduce the influence of distance visual acuity and tear safety.

• Journal of Korean Ophthalmic Optics Society
• /
• v.19 no.1
• /
• pp.79-85
• /
• 2014

Purpose: This study investigated accommodative changes by measuring accommodative response, appearing on the normal and convergence insufficiency Group, by using both eyes open-view auto-refractometer (Nvision-K5001, shin-nippon, Japan). Methods: It carried out objective and subjective refractions, targeting 74 college students (54 males and 20 females) aged between 19 and 29 ($21.59{\pm}2.53$), spherical equivalent OD $-2.28{\pm}2.03$ D, OS $-2.18{\pm}2.01$ D, by measuring accommodative responses at full correction and under correction with plus lens +0.25, +0.50, +0.75 arbitrarily added. Results: In the group of normal and convergence insufficiency, the shorter fixation distances were, the greater accommodative lags showed. The group of convergence insufficiency showed the lesser changes of accommodative response than those of normal. But we found that the convergence insufficiency group had a little larger accommodative amplitude in the total fixation distances. The full correction of convergence insufficiency group and the under correction (+0.50 D) of normal were alike in the accommodative responses. We have also investigated that the correlation between accommodative responses and fixation distances was decreased steeply at the excessive low vision correction. Conclusions: Under correction (+0.50 D) in a near distance is expected to avoid unnecessary accommodative responses, make eyes relaxed and comfortable.

• Journal of Korean Ophthalmic Optics Society
• /
• v.12 no.4
• /
• pp.29-35
• /
• 2007

This study was conducted to measure the central corneal thickness(CTT) changes associated with kinds of wearing contact lens. The CCT was measured using ultrasonic pachymeter in three hundred four subjects in their 20s and 30s. Although the CCT of Group 1 who had never worn any kinds of contact lens had no differences between left and right eye as well as between genders, the CCT tended to become thinner depending on the increment in refractive error. In Group 2 wearing only soft contact lens, the CCT was thinner depending on wearing period, and subjects wearing for more than 10 years had significantly thin CCT comparing with subjects wearing for less than 4 years. There was no significant difference in the CCT between Group 3 wearing only RGP lens and Group 2 for less than 4 years. Furthermore, when comparing the CCT between the Group 2 and Group 4 changing to RGP lens after wearing soft contact lens, there was no statistically significant change in the CCT. However, the CCT was significantly thinner in Group 5 changing to soft contact lens after wearing PMMA(polymethyl methacrylate) hard lens compared with Group 2.