• Journal of Korean Physical Therapy Science
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• v.30 no.3
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• pp.91-104
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• 2023

Background: The purpose of this study is to investigate whether peer attachment serves as a positive emotional resource for children who have experienced school violence and cyber violence victimization. In addition, we aim to present alternative programs to reduce school violence and promote positive peer attachment among children. Design: We utilized data from the 13th year(2020) of the Panel Study on Korean Children for this study. Methods: The survey was conducted through a questionnaire administered by surveyors, and the total number of cases was 1,357. Results: First, the effects of school violence and cyber violence victimization experiences were confirmed. Second, it can be inferred that children with isolation in peer relationships may ultimately be more vulnerable to cyber violence victimization, as their interactions in cyberspace may also be undermined, highlighting the potential impact of social relationships on cyber violence victimization. Third, it can be observed that children with high levels of peer attachment are emotionally stable, even when exposed to school violence and cyberviolence victimization, which may enable them to regulate the degree of victimization they experience. Conclusion: School violence experience and cyber violence experience interact with each other, and in this relationship, positive peer attachment is a positive resource. Therefore, it emphasizes the importance of the relationship between friends in preventing and overcoming school violence and provides suggestions for solutions based on this understanding.

• Journal of Korean Physical Therapy Science
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• v.30 no.4
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• pp.17-28
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• 2023

Background: The purpose of this study is to examine the multiple-parallel mediation effects of self-esteem and body-image on the relationship between peer attachment and happiness in children with chronic diseases. In addition, this study aims to provide a basis for supporting psychological services alongside therapeutic services as a way to increase the overall happiness of children with chronic diseases. Design: This study utilized data from the 2020 Panel Study on Korean Children. Methods: The survey method was conducted as a survey by investigators, and the number of cases used in the study was 363. Results: First, children's peer attachment is associated with higher levels of overall happiness. Second, it can see that peer attachment not only increases self-esteem, but also leads to a positive perception of one's own body-image. Third, it can be seen that peer attachment, high self-esteem, and positive perception of body-image increase children's overall happiness. Finally, it can be seen that peer attachment can increase children's happiness through self-esteem and body-image Conclusion: It is thought that a more positive prognosis can be expected when psychological support is provided together with therapeutic treatment in providing medical services for children with chronic diseases.

• Journal of Aerospace System Engineering
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• v.17 no.5
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• pp.19-27
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• 2023

In this study, we used finite element analysis to conduct a containment capability evaluation of a turbine case. When analyzing the impact behavior of structures subjected to impact loads, it is important to consider the strain rate, as it affects the increase in flow stress. Therefore, we applied three material models (Cowper-Symonds, Johnson-Cook, and Modified Johnson-Cook) for the impact analysis. To validate these material models, we performed an impact test on an aluminum 6061 plate. By comparing and analyzing the experimental and analytical results, we determined that the Modified Johnson-Cook material model exhibited the least error. As a result, we applied this material model to evaluate the containment capability of the turbine case. This evaluation involved determining the occurrence of penetration, as well as the stress and strain induced at the collision area due to the initial velocity of the blade.

• KIPS Transactions on Computer and Communication Systems
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• v.12 no.9
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• pp.273-282
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• 2023

Recently, various technologies such as logistics automation and port operations automation with ICT technology are being developed to build smart ports. However, there is a lack of technology development for port safety and safety accident prevention. This paper proposes an AI-based shipping container loading safety management system for the prevention of safety accidents at container loading fields in ports. The system consists of an AI-based shipping container safety accident risk classification and storage function and a real-time safety accident monitoring function. The system monitors the accident risk at the site in real-time and can prevent container collapse accidents. The proposed system is developed as a prototype, and the system is ecaluated by direct application in a port.

• Journal of Practical Engineering Education
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• v.16 no.2
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• pp.159-165
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• 2024

This study investigates the comprehensive system for collecting intelligent learning activity data tailored to learner-centered personalized education. We compared and analyzed the characteristics of xAPI, Caliper analytics, and cmi5, which are learning activity data collection standards, and established a system that allows not only standardized data but also non-standardized learning activity data to be stored as big data for artificial intelligence learning analysis. As a result, the system was structured into five stages: defining data types, standardizing learning data using xAPI, storing big data, conducting learning analysis (statistical and AI-based), and providing learner-tailored services. The aim was to establish a foundation for analyzing learning data using artificial intelligence technology. In future research, we will divide the entire system into three stages, implement and execute it, and correct and supplement any shortcomings in the design.

• Journal of Korean Medicine Rehabilitation
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• v.34 no.2
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• pp.1-14
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• 2024

Objectives The purpose of this study is to evaluate the fracture healing effect of extracts from Cnidium officinale and Angelica sinensis (CO/AS) in mice with femoral fracture. Methods C57BL/6 mice were randomly divided into normal, control (phospate-bufferd saline), positive control (tramadol), CO/AS extract 40 mg/kg and 80 mg/kg. By using Collier's method, all groups except normal group went through femoral fracture. Aspartate aminotransferase (AST), alanine transferase (ALT), lactate dehydrogenase (LDH), blood urea nitrogen (BUN) and creatinine were measured to evaluate the safety of CO/AS. Hematoxylin & eosin, Safranin O staining, x-ray, tensile and compressive force were conducted to assess the effect of CO/AS on fracture. Results The liver function test showed AST, ALT and LDH in CO/AS at 14th and 28th days were not significantly different compared with control group. The renal function test showed BUN in CO/AS at 14th days and BUN and creatinine in CO/AS at 28th days were significantly decreased compared with control group. The morphological & histological analysis and x-ray showed that CO/AS promoted cartilage and callus formation process compared with control group. The tensile and compressive forces test showed tensile in CO/AS 40 mg/kg and tensile & compressive forces in CO/AS 80 mg/kg were significantly increased compared with control group. Conclusions CO/AS extract showed the possibility that it promotes early fracture union and increases bone tensile and compressive strength, while does not have hepatotoxicity. In conclusion, CO/AS has a potential to promote healing of bone fracture and this study warranted the clinical usage of CO/AS at bone fracture.

• Journal of Korean Physical Therapy Science
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• v.31 no.2
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• pp.75-89
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• 2024

Background: The purpose of this study is to examine the mediating effect of life satisfaction and moderating effect of physical activity on the effect of adolescents' perceived positive parenting on depressed. In addition, the present study explores the role of life satisfaction and physical activity in the relationship between adolescents' perceived positive parenting and depressed, which may help in the reduction and control of adolescent depressed. Design: This study utilizes data from the 2021 Korean Children and Youth Panel Survey. Methods: First, positive parenting attitudes have a significant positive effect on life satisfaction. Second, life satisfaction has a significant negative effect on depressed. Third, life satisfaction has a mediating effect on the relationship between positive parenting and depressed. Fourth, physical activity has a significant negative effect on depressed. Fifth, physical activity has a moderating effect on the relationship between life satisfaction and depressed. Finally, this study confirmed the mediating effect of life satisfaction and moderating effect of physical activity on the relationship between positive parenting attitudes and depressed. Conclusion: This study confirmed that life satisfaction and physical activity are positive resources for depressed in adolescents. Therefore, a system that promotes a positive outlook on life and voluntary physical activity is necessary to prevent and overcome depressed. In addition, it shows the need for arts and physical education as well as entrance examination-oriented subjects in the curriculum. The results of this study may provide a basis for the therapeutic approach of mental health physiotherapy in the treatment of adolescent depressed.

• Clinical and Experimental Pediatrics
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• v.49 no.9
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• pp.983-986
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• 2006

Purpose : The purpose of this study was to investigate the presence of Bartonella henselae DNA, which is known as an etiologic agent of lymphadenitis, in fleas from dogs. Methods : The Bartonella henselae infection was investigated in 42 fleas from 22 dogs in Korea. By using seminested PCR targeting pap31 gene, B. henselae DNA was amplified from fleas. Results : B. henselae DNA was detected in seven fleas (7 of 42 fleas, 16.7 percent) from four dogs (4 of 22 dogs, 18.2 percent). To confirm these findings, we performed sequencing and identified the seven PCR products. Sequence analysis revealed that six sequences belonged to Huston-1 genogroup and one sequence to Marseille genogroup. Conclusion : These results may suggest that dogs could be an important source of B. henselae infection in children in Korea. This is the first report about the detection of B. henselae in fleas from dogs in Korea.

• Journal of Korean Society for Atmospheric Environment
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• v.31 no.3
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• pp.255-268
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• 2015

Single particle soot photometer (SP2) is an advanced instrument capable of real-time measurement of concentration, coating thickness, and size distribution of individual BC particle using laser-induced incandescence. So far, there have been insufficient studies examining the real-time characteristics of BC in Korea. In this study, we examined temporal variations in BC concentration and mass size distribution of BC in volume equivalence diameter at a background site of Aewol, Jeju in May. Average concentration and mass median diameter (MMD) of BC particles measured during the study period (06~ 16 May 2013) were $0.69{\pm}0.48{\mu}g/m^3$ and $196{\pm}17nm$, respectively. The BC concentration measured in Aewol was very similar to that observed in the spring of 2012 in Baengnyeong island, and showed diurnal profiles similar to those in other background areas. MMD of BC ranged from 172 to 222 nm. It was found that the mass size distribution of BC varied depending on the location (ground-based), season, types of air masses, and altitude (aircraft-based).

• Composites Research
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• v.26 no.4
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• pp.207-212
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• 2013

In this study, the thickness optimization for uni-directional (UD) glass fiber reinforced polymer (GFRP) laminates of the spar cap of composite tidal blades was performed under the tip deflection constrains. The spar cap was composed of GFRP composites and carbon fiber reinforced polymer (CFRP) composites. The stress distributions in the blade as well as its material costs for the optimized results were additionally investigated. The optimized thickness was obtained by interacting a sequential quadratic programming (SQP) algorithm and an ABAQUS software to calculate an objective function. It was confirmed that the thickness of UD GFRP increased with a decrease of the restrained tip deflection when a thickness of UD CFRP laminates was constrained to 9 mm. The weight of the optimized spar-cap increased up to 96.2% while the maximum longitudinal tensile stress decreased up to 24.6%. The thickness of UD GFRP laminates increased with a decrease of the thickness of UD CFRP laminates when the tip deflection was constrained to 126.83 mm. The weight increased up to 40.1%, but the material cost decreased up to 16.97%. Finally, the relationships among the weight, internal tensile stress, and material costs were presented based on the optimized thicknesses of the spar cap.