• Korean Journal of Remote Sensing
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• v.23 no.5
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• pp.385-391
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• 2007

Subsurface Internal Waves(IWs) can be detected in satellite images as periodic alternating brighter/darker stripes. It is known that there are two types of IWs-depression type and elevation type-depending on the water depth in stratified oceans. In this study, we have quantitatively verified the process of converting polarity from depression waves to elevation waves using ERS-2 SAR image acquired over the northern South China Sea. We simulated the evolution of IWs near a turning point with a numerical model for internal wave propagation. The simulation results near the turning point clearly showed us not only a conversion process of IWs from depression to elevation waves, but also a similar wave pattern with the observed SAR image. We also simulated SAR intensity variation near the turning point. The upper layer currents were computed at regular intervals using the numerical model, as the IWs were passing through the turning point. Then, an integrated hydrodynamic-electromagnetic model was used for simulating SAR intensity profiles from the upper layer currents. The simulated SAR intensity profiles were compared with the observed SAR intensities.

• Journal of Agricultural Extension & Community Development
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• v.28 no.3
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• pp.113-126
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• 2021

This study aims to explore the effects of poetry therapy program on individual stress, depression, and self-esteem for rural residents. For the research data, before the end of the poetry therapy program, participants were asked to write a confession, and as a retrospective study, in-depth interviews were conducted with 4 participants to find out whether the effects of the program continued after about 14 months. According to the results of the study, after the program ended, it was said that it was a meaningful time to communicate and live positively through poetry. In a retrospective study, it was said that poetry writing relieved depression, released and purified emotions, created a sense of relaxation and provided an opportunity for self-reflection. Based on these results, it was confirmed that rural residents who are experiencing many psychological difficulties can improve their negative psychology and find peace of mind through poetry writing.

• Child Health Nursing Research
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• v.13 no.1
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• pp.81-89
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• 2007

Purpose: This study was conducted to identify the degree of Internet addiction and factors influencing this addiction among high school students in Korea. Method: A total of 405 high school students in the Gyeoung-gi, Daegu and Gyeoung-buk areas were surveyed using questionnaires for data collection. Results: Internet addiction among high school students in Korea was relatively low. In the overall ratio distribution, however, the students who were classified as either addicted or at risk of addiction accounted for a high percentage of the students, 31.1%. Positive or negative relationships were found between internet addiction and the research variables but multiple regression analysis revealed that the most powerful predictor of Internet addiction was depression. Conclusion: Using the above results, it is necessary to develop Internet addiction prevention programs for adolescents. There should be a more comprehensive study in the future for an in-depth understanding of internet addiction of adolescents.

• Journal of Periodontal and Implant Science
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• v.43 no.2
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• pp.96-100
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• 2013

Purpose: Chronic periodontitis (CP) seems to be associated with stress and depression, but little information on this possible association is available in the literature. Thus, the objective of this study was to evaluate the association among stress, the salivary cortisol level (SCL), and CP. Methods: Seventy systemically healthy subjects were included in the study from January to September 2011. Full medical and dental histories were obtained, and the following measurements were recorded: 1) probing depth; 2) clinical attachment level; 3) bleeding on probing; and 4) tooth mobility. Saliva samples were collected for the evaluation of SCL (via a highly sensitive electrochemiluminescence immunoassay), and all subjects also answered a questionnaire (i.e., the Zung Self-rating Depression Scale). The odds ratio (OR) with a 95% confidence interval (CI) was calculated, and one way analysis of variance and the Tukey-Kramer method were performed. Results: A total of 36 subjects with CP (51.4%) and 34 without CP were evaluated. Of them, all of the subjects with CP and one periodontally healthy subject were diagnosed with depression. Subjects with moderate CP had statistically significantly higher levels of SCL than subjects with a diagnosis of slight CP (P=0.006). Also, subjects with severe CP showed the same outcome when compared to those with slight CP (P=0.012). In addition, 46 subjects presented high SCL whereas 24 had a normal level. CP was found to be correlated with the SCL, with an OR of 4.14 (95% CI, 1.43 to 12.01). Conclusions: Subjects with a high SCL and depression may show an increased risk for CP.

• Human Ecology Research
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• v.57 no.3
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• pp.431-444
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• 2019

This study explored the longitudinal developmental paths of preschooler's external problem behaviors from infancy. Subjects consisted of 205 preschoolers (106 boys, 99 girls aged 4) and their mothers recruited for the 2009 in-depth Panel Study on Korean Children. Data were analyzed by descriptive statistics, correlations, and structural equation modeling using SPSS 18.0 (SPSS Co., Chicago, IL, USA), Amos 18.0 (SPSS Co., Chicago, IL, USA). The results were as follows: Maternal depression at preschooler's age 0 had a direct effect on maternal social parenting style at preschooler's age 0. Maternal social parenting style at preschooler's age 0 had a direct effect on preschooler's effortful control at age 1. Preschooler's effortful control at age 1 had a direct effect on preschooler's external problem behaviors at age 4. Marital conflict at preschooler's age 0 did not have a direct effect on preschooler's effortful control at age 1. The direct effects of maternal depression at preschooler's age 0 on preschooler's effortful control at age 1, and on preschooler's external problem behaviors at age 4 were not significant. In addition, direct effect of maternal social parenting style at preschooler's age 0 on preschooler's external problem behaviors at age 4 was not significant. This study showed that maternal psychological characteristics, marital conflict, maternal social parenting style and preschooler's effortful control in infancy should be considered simultaneously to explain the effect on preschooler's external problem behaviors.

• 한국노년학
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• v.39 no.4
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• pp.883-893
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• 2019

The purpose of this study is to analyze the characteristics of the elderly patients with depression who were admitted to the hospital with intentional self-harm. 3,280 patients were selected from KCDC database(2011-2015) using STATA 12.0. Analysis results show that gender(female), residence(micropolitan city), result of suicide(death), risk factors(financial problems, psychological problems, physical disease, conflicts with family, place(non-residence) method of suicide(poisoning) were statistically significant. The hospital should detect the elderly patient with depression when they admitted.

• Korean Journal of Family Social Work
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• no.59
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• pp.55-79
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• 2018

The aim of study to compare the change trajectory of socioeconomic deprivation and depression the middle-aged in the single-person household and that in the Multi-person Household and to confirm the difference between the two groups. It is to examine the Longitudinal relationship between socioeconomic deprivation and depression. To do so, we studied 4,212 single-person household and Multi-person Household cases in the 7th to 11th Korea Welfare Panel Study (2012~2016). To verify the difference between both groups, we go on analysis with the latent growth curve model. According to our analysis, it is confirmed that the socioeconomic deprivation and depression of single-person households is higher than those of Multi-person Household and thus there is meaningful difference between both groups. Also, we reveal that the socioeconomic deprivation of Multi-person Household tends to decease while that of single-person household doesn't decline significantly. Furthermore, it appears that the socioeconomic deprivation is directly proportional to the depression in both groups. This research has meaningful significance in that we discussed in depth the relationship between the socioeconomic deprivation and depression of both groups, suggesting that welfare approach should be needed in the middle-aged in the single-person household.

• Industry Promotion Research
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• v.9 no.1
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• pp.149-157
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• 2024

The purpose of this study is to objectively examine the effects of integrated art therapy on cognitive function and depression in the early dementia elderly, and to identify and discuss the process of change in the early dementia elderly through a comprehensive analysis through behavior change observation diary. As a research method, a mixed study was designed using in-depth analysis through qualitative studies as well as quantitative studies on the effect of integrated art therapy on cognitive function and depression in the elderly with early dementia. The quantitative study conducted a pre-post examination of 20 elderly people with early dementia using the day care center in P-gu, Suwon, and the qualitative study analyzed the behavioral change observation diary of 10 elderly people with early dementia. These findings show that first, integrated art therapy had a significant effect on the cognitive function of the elderly with early dementia (p<.001, t=-5.871). Second, integrated art therapy had a significant effect on the depression of the elderly with early dementia (p<.001, t=5.325). Third, the integrated art therapy program changed to a positive attitude before and after cognitive function and depression of the elderly with early dementia. By revealing the effect of integrated art therapy on cognitive function and depression of the elderly with early dementia through the results of this study, it is meaningful as basic data for research related to the elderly with early dementia as well as providing effective information on integrated art therapy programs related to the elderly with early dementia.

• Journal of Advanced Marine Engineering and Technology
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• v.25 no.6
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• pp.1324-1329
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• 2001

The depression of the external situation like the departure of WTO system and the plan of EEZ proclaim is forcing fishery into improving their fishing condition. By this international and domestic circumstance, development of the sea water cooling apparatus for fish hold storage is demanded sincerely. This study represents the thermal characteristics of the fish hold storage during transportation. The numerical analysis in this study is the finite volume method with the SIMPLE computational algorithm to study the seawater flow behavior in the fish hold storage. The computation were carried out with the variations of the circulating flow velocity and depth of fish hold storage. As the result of the three dimensional simulations, the mean temperature doesn't almost change by the circulating flow rate. find the mean temperature is suddenly changed by the ratio of depth of fish hold storage.

• Design & Manufacturing
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• v.2 no.2
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• pp.33-37
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• 2008

This paper describes the optimization of injection molding conditions to minimize sink marks. Sink marks, which refer to a small depression on the surface opposite a thick wall thickness, are often encounted in injection molded plastic parts. Part geometry, material properties and processing conditions during injection molding can affect the sink mark depth. We designed the runner system which is possible balanced filling to cavities using CAE program and then obtained optimal processing conditions by Taguchi's Robust Design technique. By actual injection molding using optimized mold and molding conditions, it confirmed that sink mark depth decreased zero compared to 1mm level in the conventional mold and process.