• Journal of Ocean Engineering and Technology
• /
• v.36 no.4
• /
• pp.251-269
• /
• 2022

The process-based XBeach model has numerous empirical parameters because of insufficient understanding of hydrodynamics and sediment transport on the nearshore; hence, it is necessary to calibrate parameters to apply to various study areas and wave conditions. Therefore, the calibration process of parameters is essential for the improvement of model performance. Generally, the trial-and-error method is widely used; however, this method is passive and limited to various and comprehensive parameter ranges. In this study, the Generalized Likelihood Uncertainty Estimation (GLUE) method was used to estimate the optimal range of three parameters (gamma, facua, and gamma2) using morphological field data collected in Maengbang beach during the four typhoons that struck from September to October 2019. The model performance and optimal range of empirical parameters were evaluated using Brier Skill Score (BSS) along with the baseline profiles, sensitivity, and likelihood density analysis of BSS in the GLUE tools. Accordingly, the optimal parameter combinations were derived when facua was less than 0.15 and simulated well the shifting shape, from crescentic sand bar to alongshore uniform sand bars in the surf zone of Maengbang beach after storm impact. However, the erosion and accretion patterns nearby in the surf zone and shoreline remain challenges in the XBeach model.

• Korean Journal of Childcare and Education
• /
• v.18 no.4
• /
• pp.37-52
• /
• 2022

Objective: This study pays attention to types of parental depression and differences in happiness and self-esteem of children in each group of parents. Methods: This study employed the 10th wave of the Panel Study on Korean Children. Cluster analysis, covariance analysis, and Bonferroni verification were performed on the data of 1,282 parents with 9-year-old children. Results: A total of four parental depression groups were categorized: 'both depressed,' 'mother depressed,' 'father depressed,' and 'not depressed.' Children of the not depressed group showed the highest psychological well-being among the four groups. Children of the mother mildly depressed group had lower scores in happiness and self-esteem than those of the father mildly depressed group. Conclusion/Implications: This study was a new attempt to categorize parental depression together, breaking away from individual approaches such as mother's depression, father's depression, and mother's and father's depression and complementary approaches between couples. When examining the impact of parental depression on children's psychological well-being, it is necessary to consider depression of the father and mother as a unit.

• Earthquakes and Structures
• /
• v.24 no.1
• /
• pp.53-64
• /
• 2023

Earth fissures with several kilometers will inevitably approach or cross the metro line, significantly threatening the safety of the underground structure in the earth fissure site. However, the influence of the earth fissure site's amplification effect on the metro station's dynamic response is still unclear. A representative earth fissure in Xi'an was taken as an example to establish a numerical model of a metro station in the earth fissure site. The dynamic response characteristics of the metro stations at different distances from the earth fissure under various seismic waves were calculated. The results show that the existence of the earth fissure significantly amplifies the dynamic response of the nearby underground structures. The responses of the axial force, shear force, bending moment, normal stress, horizontal displacement, inter-story drift, and relative slip of the metro station were all amplified within a specific influence range. The amplification effect increases with the seismic wave intensity. The amplification effect caused by the earth fissure has relatively weak impacts on the axial shear, shear force, bending movement, normal stress, and horizontal movement; slightly larger impacts on the inter-story drift and acceleration; and a significant impact on the relative slip. The influence ranges of the axial force and normal stress are approximately 20 m. The influence ranges of the acceleration and inter-story drift can reach 30 m. Therefore, the seismic fortification level of the underground structure in the earth fissure site needs to be improved.

• International Journal of Advanced Culture Technology
• /
• v.11 no.3
• /
• pp.268-276
• /
• 2023

Ukiyo-e, a pivotal facet of Japanese art, had a profound impact on Western art during the 19th century, contributing to the emergence of Impressionism and Post-Impressionism. Notably, Katsushika Hokusai's "Great Wave" remains an enduring masterpiece. Ukiyo-e's historical trajectory is intricately linked to the socio-cultural context of its time. Japan's early artistic influences derived from China, evolving through the Nara and Heian periods. Ukiyo-e emerged from the Yamato-e tradition, characterized by its transition from religious themes to secular subjects. Zen Buddhism's influence during the Muromachi Shogunate shifted focus to ink wash painting, which eventually became accessible to the masses. The Azuchi-Momoyama period introduced lavish, colorful works. The Edo Shogunate upheld Kano School for the elite, while folklore painting gained popularity among the commoners, leading to the creation of Ukiyo-e. Ukiyo-e diversified its subjects, including beauty, geisha, sumo, landscapes, and more. The Asakusa district's "Shin-Yoshiwara" added to its vibrant themes. By the late 19th century, Ukiyo-e transcended its roots, encompassing landscapes, wildlife, and beyond. I explore Ukiyo-e's aesthetics and its influence on Impressionism, focusing on "The Three Masters of Ukiyo-e" - Kiyotagawa Komaro, Katsushika Hokusai, and Utagawa Hiroshige.

• Computers and Concrete
• /
• v.29 no.2
• /
• pp.117-126
• /
• 2022

The vibrational characteristic of three-layered cylindrical shell (CS) submerged in fluid with the ring support has been studied. The inner and outer layer is supposed to construct by isotropic layer. The composition of central layer is of functionally graded material type. Acoustic Wave condition has been utilized to present the impact of fluid. The central layer of cylindrical shell (CS) varies by volume fraction law that has been expressed in terms of polynomial. The main shell frequency equation has been obtained by theory of Love's shell and Rayleigh-Ritz technique. The oscillation of natural frequency has been examined under a variety of end conditions. The dependence of axial model has been executed with the help of characteristic beam function. The natural frequencies (NFs) of functionally graded material (FGM) shell have been observed of cylindrical shell along the shell axial direction. Different physical parameters has been used to examine the vibration characteristics due to the effect of volume fraction law. MATLAB software has been used to get result.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.58 no.4
• /
• pp.352-358
• /
• 2022

We explored the frequency response of krill target strength (TS) to understand the Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) using the stochastic distorted-wave Born approximation (SDWBA) model. The results showed that the distribution of orientation and the fatness factor could significantly impact on the frequency response of TS. Krill TS is clearly depended on acoustic properties, which could affect to estimate the biomass of two krill species. The results provide insight into the importance of understanding TS variation to estimate the Antarctic krill and ice krill biomass, and their ecology related to the environmental features in the Southern Ocean.

• The Journal of the Convergence on Culture Technology
• /
• v.9 no.3
• /
• pp.537-550
• /
• 2023

This study investigates the impact of Hallyu human brands on consumer behavior, given the increasing influence of Hallyu human brands due to their global spread and the limited academic discussions surrounding this topic. The research examines the role of self-congruity, human brand attachment, and brand equity factors. An online survey was conducted, targeting Chinese consumers who are highly engaged with the Korean Wave. Data from 403 respondents were analyzed. The results reveal that both ideal and actual self-congruity with the Hallyu human brand significantly affected attachment to the brand, while social self-congruity was found to be insignificant. Furthermore, attachment to Hallyu human brands positively influenced brand recognition, perceived quality, brand image, and brand loyalty.

• Korea Trade Review
• /
• v.45 no.1
• /
• pp.301-319
• /
• 2020

This study aims to explore the positive impact of Korean drama watching satisfaction on purchase intention for Korean products by considering the mediating roles of social distance to Korea, national image of Korea, and Korean product image. This study identified that Korean drama reduced the social distance to Korea while increasing the positive image of Koreas and Korean products. However, the reduced social distance was not positively associated with Korean product image and Korean product purchase intention. This implies that Korean dramas directly affect Korean product purchase intension and indirectly affect Korean national image and product image. This study supplies guidance to international marketers who aims to enter the Myanmar market. To use the Korean wave as a Korean product marketing tool, marketing strategies need to cover Korean culture-relevant materials such as cultural background, cultural characteristics, exposed products, and so on.

• Wind and Structures
• /
• v.37 no.6
• /
• pp.461-471
• /
• 2023

The main objective of this study was to establish design guidelines for three key design variables (spar thickness, spar diameter, and total draft) by examining their impact on the stress distribution and resonant frequency of a 2.5-MW spar-type floating offshore wind turbine substructure under extreme marine conditions, such as during Typhoon Bolaven. The current findings revealed that the substructure experienced maximum stress at wave frequencies of either 0.199 Hz or 0.294 Hz, consistent with previously reported experimental findings. These results indicated that the novel simulation method proposed in this study, which simultaneously combines hydrodynamic diffraction analysis, computational dynamics analysis, and structural analysis, was successfully validated. It also demonstrated that our proposed simulation method precisely quantified the stress distribution of the substructure. The novel findings, which reveal that the maximum stress of the substructure increases with an increase in total draft and a decrease in spar thickness and spar diameter, offer valuable insights for optimizing the design of spar-type floating offshore wind turbine substructures operating in various harsh marine environments.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.19 no.2
• /
• pp.437-444
• /
• 2024

The rotational inertial navigation system can provide more accurate navigation information by mounting an IMU (Inertial Measurement Unit) on the gimbal and rotating the gimbal regularly to cancel out the errors of the IMU. However, when an attitude change occurs due to waves, the attitude error is not removed to 0 at the end of one cycle of the rotation procedure and causes a large position error. In this paper, considering this problem, we propose a method of stabilizing the external gimbal by rotating it based on the roll information of the vehicle. Based on simulation, the impact of waves is analyzed and the performance of external gimbal stabilization is verified.