• Korean Journal of Radiology
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• v.20 no.4
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• pp.683-692
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• 2019

Objective: We aimed to evaluate correlations between computed tomography (CT) parameters and pulmonary function test (PFT) parameters according to disease severity in patients with chronic obstructive pulmonary disease (COPD), and to determine whether CT parameters can be used to predict PFT indices. Materials and Methods: A total of 370 patients with COPD were grouped based on disease severity according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD) I-IV criteria. Emphysema index (EI), air-trapping index, and airway parameters such as the square root of wall area of a hypothetical airway with an internal perimeter of 10 mm (Pi10) were measured using automatic segmentation software. Clinical characteristics including PFT results and quantitative CT parameters according to GOLD criteria were compared using ANOVA. The correlations between CT parameters and PFT indices, including the ratio of forced expiratory volume in one second to forced vital capacity (FEV1/FVC) and FEV₁, were assessed. To evaluate whether CT parameters can be used to predict PFT indices, multiple linear regression analyses were performed for all patients, Group 1 (GOLD I and II), and Group 2 (GOLD III and IV). Results: Pulmonary function deteriorated with increase in disease severity according to the GOLD criteria (p < 0.001). Parenchymal attenuation parameters were significantly worse in patients with higher GOLD stages (P < 0.001), and Pi10 was highest for patients with GOLD III (4.41 ± 0.94 mm). Airway parameters were nonlinearly correlated with PFT results, and Pi10 demonstrated mild correlation with FEV1/FVC in patients with GOLD II and III (r = 0.16, p = 0.06 and r = 0.21, p = 0.04, respectively). Parenchymal attenuation parameters, airway parameters, EI, and Pi10 were identified as predictors of FEV₁/FVC for the entire study sample and for Group 1 (R² = 0.38 and 0.22, respectively; p < 0.001). However, only parenchymal attenuation parameter, EI, was identified as a predictor of FEV₁/FVC for Group 2 (R² = 0.37, p < 0.001). Similar results were obtained for FEV₁. Conclusion: Airway and parenchymal attenuation parameters are independent predictors of pulmonary function in patients with mild COPD, whereas parenchymal attenuation parameters are dominant independent predictors of pulmonary function in patients with severe COPD.

• Journal of Korean Neurosurgical Society
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• v.67 no.1
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• pp.94-102
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• 2024

Objective : The spontaneous intracerebral hemorrhage (ICH) remains a significant cause of mortality and morbidity throughout the world. The purpose of this retrospective study is to develop multiple models for predicting ICH outcomes using machine learning (ML). Methods : Between January 2014 and October 2021, we included ICH patients identified by computed tomography or magnetic resonance imaging and treated with surgery. At the 6-month check-up, outcomes were assessed using the modified Rankin Scale. In this study, four ML models, including Support Vector Machine (SVM), Decision Tree C5.0, Artificial Neural Network, Logistic Regression were used to build ICH prediction models. In order to evaluate the reliability and the ML models, we calculated the area under the receiver operating characteristic curve (AUC), specificity, sensitivity, accuracy, positive likelihood ratio (PLR), negative likelihood ratio (NLR), diagnostic odds ratio (DOR). Results : We identified 71 patients who had favorable outcomes and 156 who had unfavorable outcomes. The results showed that the SVM model achieved the best comprehensive prediction efficiency. For the SVM model, the AUC, accuracy, specificity, sensitivity, PLR, NLR, and DOR were 0.91, 0.92, 0.92, 0.93, 11.63, 0.076, and 153.03, respectively. For the SVM model, we found the importance value of time to operating room (TOR) was higher significantly than other variables. Conclusion : The analysis of clinical reliability showed that the SVM model achieved the best comprehensive prediction efficiency and the importance value of TOR was higher significantly than other variables.

• Journal of Korean Neurosurgical Society
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• v.67 no.1
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• pp.31-41
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• 2024

Objective : Collateral circulation is associated with the differential treatment effect of endovascular thrombectomy (EVT) in acute ischemic stroke. We aimed to verify the ability of the collateral map to predict futile EVT in patients with acute anterior circulation ischemic stroke. Methods : This secondary analysis of a prospective observational study included data from participants underwent EVT for acute ischemic stroke due to occlusion of the internal carotid artery and/or the middle cerebral artery within 8 hours of symptom onset. Multiple logistic regression analyses were conducted to identify independent predictors of futile recanalization (modified Rankin scale score at 90 days of 4-6 despite of successful reperfusion). Results : In a total of 214 participants, older age (odds ratio [OR], 2.40; 95% confidence interval [CI], 1.56 to 3.67; p<0.001), higher baseline National Institutes of Health Stroke Scale (NIHSS) scores (OR, 1.12; 95% CI, 1.04 to 1.21; p=0.004), very poor collateral perfusion grade (OR, 35.09; 95% CI, 3.50 to 351.33; p=0.002), longer door-to-puncture time (OR, 1.08; 95% CI, 1.02 to 1.14; p=0.009), and failed reperfusion (OR, 3.73; 95% CI, 1.30 to 10.76; p=0.015) were associated with unfavorable functional outcomes. In 184 participants who achieved successful reperfusion, older age (OR, 2.30; 95% CI, 1.44 to 3.67; p<0.001), higher baseline NIHSS scores (OR, 1.12; 95% CI, 1.03 to 1.22; p=0.006), very poor collateral perfusion grade (OR, 4.96; 95% CI, 1.42 to 17.37; p=0.012), and longer door-to-reperfusion time (OR, 1.09; 95% CI, 1.03 to 1.15; p=0.003) were associated with unfavorable functional outcomes. Conclusion : The assessment of collateral perfusion status using the collateral map can predict futile EVT, which may help select ineligible patients for EVT, thereby potentially reducing the rate of futile EVT.

• The Journal of Korean Academy of Sensory Integration
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• v.21 no.3
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• pp.1-12
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• 2023

Objective : The purpose of this study was to compare the effects of the sensory processing characteristics of parents of developmentally delayed children and parents of typically developed children on parenting stress. Methods : From July to August 2022, 61 parents of children with developmental delays and 64 parents of children with typical development who used occupational therapy services at pediatric clinics and child development centers were evaluated for parenting stress and sensory profiles. Results : In a multiple regression analysis on the effect of sensory processing characteristics on the total score of parenting stress, tactile processing (β = 0.353, p = 0.001), gender (β = 0.438, p = 0.000), and monthly income (β = -0.261, p = 0.014) significantly affected the parenting stress of the parents of children with developmental delay. In parents of typically developing children, tactile processing (β = 0.376, p = 0.002) and gender (β = -0.264, p = 0.024) were found to have a significant effect on parenting stress. Conclusion : Parental gender and tactile processing characteristics of developmentally delayed and typically developing children are significant influencing factors for parenting stress.

• The Journal of the Convergence on Culture Technology
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• v.10 no.2
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• pp.159-166
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• 2024

The purpose of this study was investigate the effect of self-efficacy, self-directedness and self-leadership on reslience in nursing students and to provide the basic data of to enhance resilience. Data were collected from 199 nursing students in B city. Data analysis was analyzed by descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression analysis using the SPSS 22.0 program. The degree of self-efficacy of the subjects was 3.63±0.52. Resilience of the subjects was positively correlated with self-efficacy (r=.677, p<.001), self-directedness (r=.573, p<.001), and self-leadership (r=.654, p<.001). Self-leadership of the subjects showed a positive correlation with self-efficacy (r=.517, p<.001), self-directedness (r=.665, p<.001). Self-directedness of the subjects showed a positive correlation with self-efficacy (r=.491, p<.001). The factors influencing the subject's resilience were identified as self-efficacy (β=.435, p<.001) and self-directedness (β=.133, p=.036), self-efficacy (β=.341, p<.001), and the explanatory power was 57.5%. Therefore, in order to improve nursing students' resilience, it is necessary to consider self-efficacy, self-directedness and self-leadership.

• Journal of the Korean Applied Science and Technology
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• v.40 no.6
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• pp.1350-1362
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• 2023

This study aims to identify the influence of the image of Chinese Taekwondo leaders at university on the athlete's grit, psychological state, and performance. The analysis is expected to contribute to the quality development of Chinese universities' Taekwondo program in the future. For this study, a population was selected from athletes at a university in Henan Province, China. The samples were taken by convenience sampling method. Of the 380 questionnaires retrieved, a total of 365 were used to process the results, excluding 15 insincere responses or missing values. The collected data were conducted by frequency analysis, correlation analysis, reliability analysis, exploratory factor analysis and multiple regression analysis using SPSS 23.0 program. The results of this study are as follows. First, the sub-factors of the leader image, the leader's social activities and vocational awareness, qualities, tasks and roles, were found to have a significant impact on the grit of taekwondo athletes. Second, the sub-factors of the leader image, the leader's social activities and vocational awareness, qualities, attitudes, tasks and roles had significant impact on the phychological state of taekwondo athletes. Third, social activities, vocational awareness, quality, and attitude of the leader, which are the sub-factors of the leader image, have a significant impact on the performance of taekwondo athletes.

• Journal of the Korean Applied Science and Technology
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• v.41 no.1
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• pp.138-148
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• 2024

The purpose of this study is a descriptive research study to confirm the relationship between perception of strength, academic self-efficacy and major satisfaction of nursing college students and to identify factors influencing major satisfaction. The subjects of this study were 172 nursing college students located in G City, and data collection was conducted from November 7 to December 21, 2022. The collected data were analyzed by descriptive statistics, t-test, ANOVA, Pearson's correlation coefficients and multiple regression analysis using SPSS/WIN 28.0 program. As a result of the study, major satisfaction had a significant positive correlation with perception of strength (r=.31, p<.001) and academic self-efficacy (r=.62, p<.001). Factors affecting major satisfaction of nursing college students were academic self-efficacy (𝛽=.53, p<001.) and advice from others as motivation of choosing major (𝛽=-.20, p=.002), which explained 42.6% of variance. The results of this study will be useful used to develop strategies to improve the major satisfaction of nursing college students. In the future, a follow-up study that can expand the subjects and explain the major satisfaction of nursing college students is suggested.

• Journal of Family Resource Management and Policy Review
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• v.28 no.1
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• pp.1-11
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• 2024

The purpose of this study was to provide basic data to help individuals with disabilities in single-person households maintain a happy life by analyzing how interpersonal skills necessary for community adaptation and self-esteem, which are personal factors, affect life satisfaction. The self-esteem mediation effect was verified with SPSS Process Macro 4.3 using data on 828 single-person households sourced from the seventh wave of the Disability Employment Panel Survey(2022) conducted by the Employment Development Institute of the Korea Disability Employment Service. To examine the effects of interpersonal skills and self-esteem on life satisfaction, a multiple regression analysis was conducted. While it was found that higher self-esteem was associated with higher life satisfaction, interpersonal skills did not have a significant effect on this association. The path from interpersonal skills to life satisfaction via self-esteem was deemed statistically significant, suggesting that self-esteem mediates the relationship between interpersonal skills and life satisfaction. This study emphasizes the importance of interpersonal relationships for the life satisfaction of individuals with disabilities in single-person households in a modern society in which the problem of social isolation experienced by individuals in single-person households is emerging. Furthermore, it provides a direction for these individuals to become the main actors of their own lives.

• Journal of agricultural medicine and community health
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• v.49 no.1
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• pp.50-58
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• 2024

Objective: The purpose of this study is to examine the factors influencing the health status of first-year high school students leisure activity time, considering of the city size. Methods: This study utilized the first cohort survey of the Korean Children and Youth Panel Survey. The analysis was used data from survey targeting first-year high school students of 2021. The city size was divided into large cities and medium and small-sized cities, and T-test was conducted to examine differences in factors by city size, and multiple regression analysis was conducted to identify factors influencing health status according to leisure activity time on weekdays and weekends by city size. Results: In large cities, exercise and physical activity time and other than that, Time to play with friends had a positive effect(+), Time to play with a smartphone had a negative effect(-) on both weekdays and weekends. In medium and small-sized cities, Exercise and physical activity time and Time to play while watching TV had a positive influence(+) on both weekdays and weekends, while Time to play with a smartphone had a negative influence(-). Conclusion: There were the same questions for factors influencing health status, but other questions also appeared. Leisure activities that have a positive(+) impact on health status by city size are supported so that leisure activities can be actively carried out, while leisure activities that have a negative(-) impact are participate in other leisure activities together to improve health. It is believed that this plan should be considered.

• Journal of Environmental Health Sciences
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• v.50 no.2
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• pp.157-167
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• 2024

Background: Several previous studies have shown that commuting is a source of stress for undergraduate students. However, few studies have investigated the effect of commuting on academic stress among undergraduate students, and there has been little awareness of the environmental impact of commuting. Objectives: To evaluate the associations between commute type and/or time and academic stress among undergraduate students in South Korea, focusing on environmental sustainability. Methods: We conducted an online survey and obtained information on commute types, commute times, and academic stress from 510 undergraduate students aged ≥19 years. Academic stress was comprised of five sub-categories of stress, and total academic stress ranged from 5 to 25 points. Multiple linear regression analysis was used to analyze the associations between commute type and commute time and academic stress. Furthermore, the students were grouped into 21 categories based on their transportation mode for commuting. CO₂ emission factors per each commuting category were calculated using the transportation type's CO₂ emission data from previous studies. Spearman's correlation analysis was used to confirm the correlation between CO₂ emission factors and total academic stress. Results: Students using home-to-school transportation without transfers (vs. walking) showed a significantly higher total academic stress of 2.19 points (95% CI: 0.58, 3.80). In contrast, students using school-to-home transportation without transfers (vs. walking) showed a significantly lower total academic stress of 1.96 points (95% CI: -3.55, -0.38). Moreover, students using transportation with lower CO₂ emission factors had lower academic stress scores (home-to-school: correlation coefficient = 0.507, p<0.001; school-to-home: correlation coefficient = 0.491, p<0.001). Conclusions: Our findings suggest that both commute type and time are significantly associated with academic stress among South Korean undergraduate students. When students select environmentally-friendly transportation, they may not only improve their mental health but also improve climate resilience.