• Journal of the Korean Applied Science and Technology
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• v.41 no.2
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• pp.260-272
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• 2024

This study utilized the Delphi technique to derive results by gathering opinions from experts, analyzing the problems in university survival swimming education, and seeking improvement methods. The conclusions of this study revealed several issues in university survival swimming education. From the perspective of instructors, the lack of expertise and certification in survival swimming was identified as a problem. From a program standpoint, discrepancies between educational content and real-world applications led to decreased practicality. Regarding facilities, the absence of swimming pools within universities was highlighted as a major issue. Proposed solutions included mandatory completion of instructor certification courses to address instructor-related issues. For program improvements, conducting education in environments similar to real-world scenarios was suggested. In terms of facilities, there was a call for expanding swimming facilities within universities. It is anticipated that addressing the identified problems and implementing proposed solutions will lead to more systematic and professional education. Furthermore, it is believed that addressing changeability and hopefulness, and continuously improving based on them, will positively impact the establishment of societal safety consciousness and, ultimately, enhance awareness of water safety.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.10
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• pp.1903-1911
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• 2016

As interest in MANET is increasing nowadays, research upon an efficient MANET routing protocol is actively under way. A LQA(Link Qualty Aware)-AODV routing protocol to deal with frequent changes of topology and wireless link variations under tactical operating conditions is proposed in this paper. The suggested LQA-AODV takes into account the channel capacity of each hop during the route request process of the traditional AODV protocol. In detail, LQA-AODV adds a channel capacity cost value to the RREQ message format that occurs during the routing process of the existing AODV Routing Protocol causing the accumulated channel capacity cost values of each sections to be compared before establishing a route. To verify the performance of LQA-AODV, NS2.35 was utilized and the Link-Quality Model was applied in order to reflect the tactical wireless environment. The simulation compares and analyzes LQA-AODV and the existing AODV, showing a large improvement over the traditional AODV in regards to the Packet Delivery Ratio, and End-to-End Delay.

• Journal of the Korean Applied Science and Technology
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• v.40 no.5
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• pp.1081-1091
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• 2023

This study examined the causal relationship between exercise satisfaction and behavioral intention experienced by participating in park golf with passion. The target was 189 park golf participants, and The subjects of the survey were those living in Sejong City and playing park golf from July 20 to September 14, 2023. SPSS 21.0 was used for data analysis. In addition, the influence relationship between each factor was examined through frequency analysis, reliability analysis, exploratory factor analysis, correlation analysis, and multiple regression analysis. Research results: First, passion had a positive effect on exercise satisfaction. Second, passion was confirmed to have a positive effect on behavioral intention. Third, exercise satisfaction had a positive effect on behavioral intention. This means that the thermal emotions of park golf play a role in increasing satisfaction and behavioral intention. If an environment is created where participants' passion does not decrease, it will have an impact on expanding the base of park golf.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.34 no.5
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• pp.18-38
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• 2002

A previous study on the model coatings based on latex-bound plastic pigment coatings (1) has been extended to latex-bound No. 1 clay, ultra-fine ground calcium carbonate (UFGCC), and clay-carbonate pigment mixture coatings, which are being widely used in the paper industry. The latex binder used was a good film-forming, monodisperse S/B latex or 0.15$\mu\textrm{m}$. No. 1 clay was representative of plate-like pigment particles, whereas UFGCC was of somewhat rounded rhombohedral pigment particlel. Both of them had negatively skewed triangular particle size distributions having the mean particle suet of 0.7${\mu}{\textrm}{m}$ and 0.6$\mu\textrm{m}$, respectively. Their packing volumes were found to be 62.5% and 657%, respectively. while their critical pigment volume concentrations (CPVC's) were determined to be 52.7% and 50.5% ( average of 45% caused by the incompatibility and 55.9% extrapolated) by coating porosity, respectively. Each pigment/latex coating system has shown its unique relationship between coating properties and pigment concentrations, especially above its CPVC. Notably, the clay/latex coating system hat shown higher coating porosity than the UFGCC/latex system at high pigment concentrations above their respective CPVC's. It was also found that their coating porosity and gloss were inter-related to each other above the CPVC's, as predicted by the theory. More interestingly, the blends of these two pigments have shown unique rheological and coating properties which may explain why such pigment blends are widely used in the industry. These findings have suggested that the unique structure of clay coatings and the unique high-shear rheology of ground calcium carbonate coatings can be judiciously combined to achieve superior coatings. Importantly, the low-shear viscosity of the blends was indicative of their unique packing and coating structure, whereas their high-shear rheology was represented by a common mixing rule, i.e., a viscosity-averaging. Transmission and scanning electron and atomic force microscopes were used to probe the state of pigment / latex dispersions, coating surfaces, freeze fractured coating cross-sections, and coating surface topography. These microscopic studies complemented the above observations. In addition, the ratio, R, of CPVC/(Pigment Packing Volume) has been proposed as a measure of the binder efficiency for a given pigment or pigment mixtures or as a measure of binder-pigment interactions. Also, a mathematical model has been proposed to estimate the packing volumes of clay and ground calcium carbonate pigments with their respective particle size distributions. As well known in the particle packing, the narrower the particle size distributions, the lower the packing volumes and the greater the coating porosity, regardless of particle shapes.