• Journal of the Korean Geotechnical Society
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• v.37 no.6
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• pp.29-37
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• 2021

Since many geotechnical structures are constructed on a weathered granite layer, it is important to evaluate their characteristics. As a seismic design is the more important nowadays, the demands to estimate a shear wave velocity (V_S) based on acceptable methods are increasing. In this study, an empirical equation predicting V_S of the weathered granite layer is suggested based on the nonlinear multiple variable regression analysis whose independent variables are both SPT (Standard penetration test)-N₆₀ and chemical weathering index. It is concluded that the accuracy of the empirical equation estimating V_S of the weathered granite layer increases when it considers the chemical weathering index as an additional independent variable compared to the result of simple regression analysis using only N₆₀.

• Journal of Digital Convergence
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• v.19 no.7
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• pp.237-243
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• 2021

This study was attempted to identify the difference between nursing competencies and major satisfaction before and after the first clinical practice of nursing college students and use it as basic data for efficient clinical practice education. Data collection by single group pre- and post-design was conducted from February 18 to April 23, 2019 for 201 nursing college students before and after clinical practice for 8 weeks. The collected data were analyzed by frequency, paried t-test, and Pearson's Correlation, Multiple Regression using SPSS/Win 23.0. As a result of the study, Nursing competency increased after the first clinical practice than before, but it was not significant(t=-1.73, p=.084). Among the sub-factors of nursing competency, educational ability(t=-1.97, p=.050) and ethical practical ability(t=-209, p=.038) was found to increase significantly. Major satisfaction was significantly increased after clinical practice than before(t=-2.45, p=.015). After clinical practice, it was found that general satisfaction, relationship satisfaction, and recognition satisfaction which are sub-factors of major satisfaction, had a positive correlation with nursing competency. As a result of analyzing the impact on nursing competency, it was found that recognition satisfaction explains nursing competency as 9.9%. Therefore, it is necessary to reorganize the clinical practice curriculum that can improve nursing competency, develop a program that can improve major satisfaction, and verify the effectiveness.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.10
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• pp.1331-1340
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• 2020

Object detection in maritime means that the captain detects floating objects that has a risk of colliding with the ship using the computer automatically and as accurately as human eyes. In conventional ships, the presence and distance of objects are determined through radar waves. However, it cannot identify the shape and type. In contrast, with the development of AI, cameras help accurately identify obstacles on the sea route with excellent performance in detecting or recognizing objects. The computer must calculate high-volume pixels to analyze digital images. However, the CPU is specialized for sequential processing; the processing speed is very slow, and smooth service support or security is not guaranteed. Accordingly, this study developed maritime object detection software and implemented it with FPGA to accelerate the processing of large-scale computations. Additionally, the system implementation was improved through embedded boards and FPGA interface, achieving 30 times faster performance than the existing algorithm and a three-times faster entire system.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.105-115
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• 2021

The purpose of this study is to present the effect of differences in individual coping and organizational homogeneity culture on information security compliance from an exploratory perspective. The study divided groups into individual coping (task-oriented, emotion-oriented) and organizational homogeneity culture (homogeneity, heterogeneity), confirms the difference in information security for each group through cross-design and presents a multiple mediation model between information security factors. As a result of the study, in the coping dimension, the average of the security compliance factors was higher in the emotion-oriented than the task-oriented, and in the homogeneity culture dimension, the average of the security compliance factors was higher in the homogeneity than the heterogeneity. Additionally, social influence and involvement had a multiple mediation effect on the relationship between information security awareness and compliance intention. The implications of this study were to confirm the difference in the effect of individual decision-making styles on security compliance according to the organizational culture differences. The results suggest the necessity of applying a customized information security compliance model for each organization and individual characteristics.

• Journal of the Korea Society for Simulation
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• v.30 no.1
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• pp.103-112
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• 2021

In recent years, public bicycle systems are widely spread over the world according to the development of ICT technology. Since the public bicycle systems in large cities need to secure both publicity and convenience for citizens, analysis of various their issues from introduction to operation is required. In addition, it is also necessary to prepare for various scenarios for coexistence with the PM business, which is recently in the spotlight as a last mile means and normally managed privately. This paper introduces modeling and simulation for efficient operations of public bicycle systems. In particular, the proposed method was developed in a form that can be easily used in other cities by modeling the general structure and behavior of the public bicycle system, and it was developed to facilitate modification and expansion of the future model with a component-based model configuration. This paper provides a case study of the propose method, which is the public bicycle simulation in Sejong City. The simulation results were derived by applying the data from the public bicycle system of Sejong City, and they were verified with the associated real data of Sejong City. Using the verified model, it is expected that it can be used as a tool to design and analyze various services on the public bicycle systems, which were especially suitable for Sejong City.

• Journal of Digital Convergence
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• v.19 no.3
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• pp.151-160
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• 2021

The purpose of this study is to analyze the impact of CSR on the managers' compensation-performance sensitivity, and to determine whether there are differences in this relationship as the governance structure is more efficient. The sample for analysis was from KOSPI-listed companies in 2011-2017, and regression analysis was performed to confirm the relevance. The results are as follows: First, in CSR company, there was a negative relationship for managers' compensation-accounting performance sensitivity and a positive relationship for managers' compensation-stock performance sensitivity. Second, CSR and the managers' compensation-performance sensitivity vary depending on the type of corporate governance. In CSR companies, when the corporate governance is effective, the managerial compensation system generally complements each other. These results suggest that there is a need to design an effective manager's compensation system within the company in order to induce managers' decision-making in the direction of increasing shareholder profits in a long-term perspective in CSR companies. In addition, if we identify the relationship with the governance structure and reduce or improve the devices that overlap each other, it is believed that it will contribute to enhancing corporate value.

• Therapeutic Science for Rehabilitation
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• v.10 no.3
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• pp.23-41
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• 2021

Objective : The purpose of this study was to analyze the effects of simultaneous dual-task training to assess executive function in older adults. Methods : We searched the PubMed, EMBASE, Cochrane, Web of Science, and RISS databases of publicated studies in the past decade. Seven studies were selected based on the inclusion and exclusion criteria. Qualitative assessment and meta-analysis were performed for the seven studies. Results : A randomized controlled trial design was used in the selected studies, and PEDro Scores above seven were obtained. The Trial Making Test (TMT) evaluated the effects of dual-task training on executive function in four studies. The Color Trail Test (CTT) was used in two studies, and Stroop test was used in three studies. The effect size for total executive function was 0.38, which was small. The effect sizes for TMT and CTT were 0.37. Stroop Test was 0.34, demonstrating that their effect sizes were also small. Only significant effects in total executive function, TMT, and CTT showed significant effects (all p<0.05). Conclusion : This study confirmed that dual-task training was effective in improving executive function in older adults. To improve the effectiveness of dual-task training, the difficulty of the dual-task training should be considered. It is also necessary to implement assessments that can evaluate performance under dual-task conditions as well as conventional test tools for executive function. In the future, dual-task training could be used as an appropriate intervention for executive function in older adults to delay the onset of dementia.

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.43-50
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• 2021

The purpose of this research is to confirm the degree of awareness, knowledge and attitude for the safety management of patients in elderly care facilities, to investigate the factors that affect the safety performance of patients by nursing caregivers, and to provide basic material for the development of educational programs for strengthening performance. The research target audience was 142 nursing caregivers working in the G metropolitan city and S city elderly care facilities, and the data collected from 7/10/2020 to 7/28/2020, were analyzed with the SPSS/WIN 21.0 program. The ability of a nursing caregiver to perform patient safety is increasing as a result of higher education, higher patient safety awareness, and also more positive attitude towards patient safety. The major factors that affect the safety performance of patients by nursing caregivers were attitude toward patient safety, patient safety awareness, and the amount of participation in patient safety education. It's explanatory power was 26.9%. Based on the results of this research, we propose a study to confirm the positive effects of patient safety consciousness and attitude by confirming the education program completed by nursing caregivers and systematizing the education method and design in the education program of nursing caregivers.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.2
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• pp.131-140
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• 2022

Installing Continuous Welded Rail (CWR) is one of the economical ways to resolve the challenges of noise, vibration, and the open-deck steel railway bridge impact, and the SSF method using the interlocking sleeper fastener has recently been developed. In this study, the method employed for determining the optimum vertical stiffness of the sleeper pad installed under the bridge sleeper, which is utilized to adjust the rail height and absorb shock when the train passes when the interlocking sleeper fastener is applied, is presented. To determine the optimal vertical stiffness of the sleeper pad, related existing design codes are reviewed, and, running safety, ride comfort, track safety, and bridge vibration according to the change in the vertical stiffness of the sleeper pad are estimated via flexible multi-body dynamic analysis,. The flexible multi-body dynamic analysis is performed using commercial programs ABAQUS and VI-Rail. The numerical analysis is conducted using the bridge model for a 30m-long plate girder bridge, and the response is calculated when passing ITX Saemaeul and KTX vehicles and freight wagon when the vertical stiffness of the sleeper pad is altered from 7.5 kN/mm to 240 kN/mm. The optimum stiffness of the sleeper pad is calculated as 200 kN/mm under the conditions of the track components applied to the numerical analysis.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.2
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• pp.83-91
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• 2022

Seismic design and analysis of nuclear power plant components are performed based on an decoupled model. However, this decoupled analysis has a limitation in that it generates inaccurate results compared to the coupled analysis because it cannot simulate actual phenomena such as the interaction between structures and components. Thus, this study performed seismic coupled and decoupled analysis on an existing nuclear containment structure and related components, considering the mass and natural frequency ratios. And based on these results, comparative analyses of responses of components were conducted. Consequently, the seismic coupled analysis result generally gave a smaller value than the decoupled analysis result. These results were similar to the analysis results for the simple coupled model, which was an existing study, but the difference in component responses was much more pronounced. Also, this was influenced by the installation location of the component rather than the influence of the input frequency of the input seismic motions. Finally, the difference between the decoupled and coupled seismic analysis occurred in the region where the mass ratio of the components was large, and the natural frequencies were almost similar due to the considerable dynamic interaction between the structure and the component in this realm.