• Human Ecology Research
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• v.55 no.1
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• pp.1-12
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• 2017

This study examines the relationship among children's smart device immersion tendency, children's self-regulation, and pro-social behavior as well as investigates the mediating effect of self-regulation between children's smart device immersion tendency and pro-social behavior. Participants were composed of 263 4-year-old children attending kindergarten in Incheon and Gyeonggi province. Data were analyzed by means of Pearson's correlation coefficients in SPSS, the structural equation model and bootstrapping in AMOS. The results are as follows. First, there is a statistically meaningful relationship among children's smart device immersion tendency, self-regulation, and pro-social behavior. There is a negative correlation between children's smart device immersion tendency and children's self-regulation as well as pro-social behavior; however, there is positive relationship between children's self-regulation and pro-social behavior. Second, children's smart device immersion tendency had a direct effect on children's self-regulation. In addition, children's self-regulation indicated a direct effect on children's pro-social behavior. Third, children's self-regulation was found sufficient to mediate the relationship between children's smart device immersion tendency and pro-social behavior. The results indicate that the effort to increase children's self-regulation may decrease the negative effect toward children's pro-social behavior caused by smart device immersion tendencies.

• Korean Journal of Human Ecology
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• v.23 no.2
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• pp.219-229
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• 2014

The purpose of this study was to investigate the effects of preschooler's self-regulation and maternal parenting behavior on preschooler's game immersion. Subjects were 253 4- to 5-year-old preschoolers(118 boys, 135 girls) and their mothers. Data were analyzed by descriptive statistics, t-test, correlation analysis and stepwise multiple regression analysis. The major findings are summarized as follows: (1) preschooler's game immersion differed from preschooler's gender. Boy preschooler had higher score than girl preschooler in game immersion. (2) Both boy and girl preschooler's game immersion was negatively correlated with preschooler's behavioral regulation and emotional regulation, maternal rational guidance, limit-setting and affection. (3) The most influential factor on boy preschooler's game immersion was behavioral regulation. On the other hand, the most influential factor on girl preschooler's game immersion was emotional regulation, and the next influential factor was maternal affection. Results of this study indicate that self-regulation enhancement program should be developed and mothers should be more affective with their preschoolers in order to prevent preschoolers' game immersion.

• Korean Journal of Child Studies
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• v.35 no.2
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• pp.25-41
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• 2014

The purpose of this study was to investigate the relationships between play behaviors and young children's playfulness in a variety of play space environments. The subjects were 150 4-year old children of 29 mixed-age classes in childcare centers of Seoul and Gyeonggi area. The results were as follows; (1) Their play behaviors differed according to their play environment in terms of classroom spaces. Solitary-active play behaviors were more frequently observed in large play spaces than small. (2) Leading participation, cognitive flexibility, voluntary full immersion, and total playfulness scores correlated negatively with reticent behavior. Leading participation, voluntary full immersion, and total playfulness scores, on the other hand, correlated positively with group play behavior. (3) In small play spaces, leading participation, voluntary full immersion correlated negatively with reticent behavior, but leading participation correlated positively with group play. In middle play spaces, cognitive flexibility correlated negatively with reticent behavior. In large play spaces, voluntary full immersion correlated negatively with parallel play, but leading participation, cognitive flexibility, expressions of joy, voluntary full immersion, and total playfulness score correlated positively with group play.

• Journal of Power System Engineering
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• v.18 no.3
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• pp.87-92
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• 2014

This study is aimed at investigating the thermal behavior of immersion-cooled high power LED lighting engines. 3D CFD models have been generated for the numerical analysis. Five cases in terms of the configuration of LED chips have been explored for various passive cooling conditions of the lighting engine, i.e., the natural air convection with a lens, the natural air convection without a lens, the deionized water-immersion cooling condition with a lens. The numerical study reveals that the deionized water-immersion cooled lighting engine has nearly twice better thermal performance than the natural air convection cooled lighting engine containing a lens. The investigation has also demonstrated that the four chips configuration has the better thermal performance than the single chip configuration.

• The Journal of the Korea Contents Association
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• v.15 no.10
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• pp.647-657
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• 2015

The purpose of this study is to investigate how young children's excessive immersion in smartphone games affects their prosocial and problematic behavior. To achieve the purpose, a qustionnaire survey was conducted with 147 children aged 3 to 5 going to two kindergartens and two child-care centers which were judged to have similar social and economic conditions, their mothers, and 16 teachers in charge of them. For data processing, SPSS 18.0 program was used to conduct frequency analysis, correlation analysis, and simple regression analysis. The study results were presented as follows. First, the more seriously the young children had excessive immersion in smartphone games, the more negatively their prosocial behavior was influenced. Secondly, the more severely the young children had excessive immersion in smartphone games, the more problematic behavior the young children had. This study is meaningful in the point that it analyzed the impact of their addiction in smartphone games on their prosocial and problematic behavior, and thereby helped to improve a plan of effectively using smartphones as educational media.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.11
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• pp.402-415
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• 2019

This study explores the effect that unresearched organizational conduct has on employee engagement (job immersion) as a cause variable and the results from it. Major results identified in an empirical analysis are as follows. First, the main causes of organizational citizenship behavior (such as altruism, conscientious behavior, moral behavior, participatory behavior, and fair play) are shown to not affect job immersion. In other words, conscientious, participatory, and fair behavior affects job immersion, with participatory behavior having the greatest impact. Second, employees' concentration in an organization was only affected by participatory behavior and fair play behavior from among the factors of organizational citizenship behavior, only more so. That is, it has been shown that some of the causes of organizational citizenship behavior, including participatory behavior and fair play behavior, affect employee inter-behavior, and some of them are more influential than others. Third, the only factor that influences the intention to switch jobs among the organizational citizenship behavior is participatory behavior. In other words, altruism, conscientiousness, politeness, and fair play behavior do not affect the way people move from job to job. Participation in organizational citizenship behavior and fair play may affect employee inter-behavior, and the more influential participatory behavior may also affect the intention to relocate.

• Journal of the Korea Safety Management & Science
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• v.23 no.4
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• pp.31-42
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• 2021

Recently, virtual reality (VR) and augmented reality (AR) technologies are attracting attention as core technologies in the era of the 4th industrial revolution. These virtual and augmented reality technologies are being used in a variety of industries, including the construction industry, healthcare industry, and manufacturing industry, to innovate in communication and collaboration, education and simulation, customer service and reinvention of the customer experience. In this paper, VR-based experiential safety education was conducted for workers of shipbuilding companies in Ulsan city, and for them, the educational effectiveness such as immersion, site applicability, safety accident prevention, education satisfaction, overall performance, and safety behavior in VR-based safety experience education were measured. In addition, we examined whether the immersion of VR-based safety experience education affects site applicability, safety accident prevention, educational satisfaction, overall performance, and safety behavior. Furthermore, it was analyzed whether site applicability plays a mediating role in the relationship between immersion and safety accident prevention. As a result, it was found that the immersion of VR-based safety experience education affects site applicability, safety accident prevention effect, education satisfaction, overall performance, and safety behavior, and that site applicability mediates between immersion and safety accident prevention. Based on these results, we suggests a direction for the development of VR-based contents in the field of safety and health and the transformation of safety and health education in the future.

• Journal of Information Technology Applications and Management
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• v.29 no.1
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• pp.47-57
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• 2022

The purpose of this study is to analyze the current status of augmented reality picture books, which have been steadily developed since 2010, as a genre of electronic picture books, and to reveal how children's immersion in augmented reality picture books differs from paper picture books. To this end, 30 augmented reality picture books on the market were analyzed according to genre, life theme, implementation method, and augmented reality scene ratio. As a result of the study, it was found that the genre of picture books was in the order of information fairy tales, daily fairy tales, and historical fairy tales, and there were no traditional or fantasy fairy tales. Animals and plants accounted for about half of the life topics, and in some cases, there were only a few or no other life topics. In the augmented reality implementation scene, it consisted of only one page in the early days, but all pages are now possible to implement augmented reality due to technology development, production cost reduction, and improved hardware performance of smartphones. It was found that the augmented reality implementation method used CD-ROM in the early days, but gradually became possible to implement using only mobile phones and tablets that were easy for readers to access. In addition, after presenting four picture books to eight 5-year-old infants, the immersion time was measured and the immersion behavior was observed. As a result, augmented reality picture books showed higher immersion[immersion time, immersion behavior] than paper picture books, but compared by literature genre, life fairy tales were higher in paper picture books and natural fairy tales in augmented reality picture books. It was higher when presenting augmented reality picture books after presenting paper picture books according to the order of presentation of picture book types. The results of this study suggest that more diverse life topics and augmented reality picture books in the genre of children's literature should be developed to increase the utilization of augmented reality picture books. In addition, considering that there are differences in immersion between types, literary genres, and reading experience [presentation order], it is expected to increase the educational effect by using picture books complementarily.

• Tribology and Lubricants
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• v.19 no.1
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• pp.31-35
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• 2003

This paper reports the studies on the wear-corrosion behavior of ductile cast iron in the various pH environments. In the variety of pH solutions, corrosion and wear-corrosion loss of GCD 600 were investigated. Also, the anodic polarization test of GCD 600 using potentiostat/galvanostat was carried out. And rubbed surface of GCD 60 using scanning electron micrographs after immersion and wear-corrosion test was examined in the environment of various pH values. The main results are as following In alkali zone, the wear-corrosion loss of GCD 600 increases, but corrosion loss decreases. The unevenness and crack of wear-corrosion surface in neutral zone becomes duller than that in alkali zone. As the corrosive environment is acidified, wear-corrosion behavior of GCD 600 with passing immersion time becomes sensitive.

• Journal of Electrochemical Science and Technology
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• v.13 no.2
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• pp.213-226
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• 2022

In the present study, the corrosion behavior of aluminum Al-7075 tempered (T-6 condition) alloy was evaluated by immersion testing and electrochemical testing in 1.75% and 3.5% NaCl environment at acidic, neutral and basic pH. The data obtained by both immersion tests and electrochemical corrosion tests (potentiodynamic polarization and electrochemical impedance spectroscopy tests) present that the corrosion rate of the alloy specimens is minimum for the pH=7 condition of the solution due to the formation of dense and well adherent thin protective oxide layer. Whereas the solutions with acidic and alkaline pH cause shift in the corrosion behavior of aluminum alloy to more active domains aggravated by the constant flux of acidic and alkaline ions (Cl^- and OH^-) in the media which anodically dissolve the Al matrix in comparison to precipitated intermetallic phases (cathodic in nature) formed due to T6 treatment. Consequently, the pitting behavior of the alloy, as observed by cyclic polarization tests, shifts to more active regions when pH of the solutions changes from neutral to alkaline environment due to localized dissolution of the matrix in alkaline environment that ingress by diffusion through the pores in the oxide film. Microscopic analysis also strengthens the results obtained by immersion corrosion testing and electrochemical corrosion testing as the study examines the corrosion behavior of this alloy under a systematic evaluation in marine environment.