• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.177-185
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• 2016

This study quantified optimism, emotional intelligence, and depression levels, and explored potential key factors affecting the depression level in undergraduate students. We performed a survey targeting undergraduate students in two Universities at D city and S city, between April 8th and 30th of 2016. After receiving informed consent, a total of 166 university students were recruited. They were asked to fill in a self-reported questionnaire about optimism, emotional-intelligence, and depression. The data were analyzed through descriptive statistics, Pearson's correlation coefficient, and multiple regression analysis using IBM SPSS version 22.0. The data analysis results showed that the mean score for optimism was $3.67{\pm}0.51$, $3.66{\pm}0.49$, and $3.69{\pm}0.55$ for overall undergraduate students, undergraduate nursing students, and undergraduate non-nursing students, respectively. Moreover, the mean score of emotional intelligence was $3.56{\pm}0.49$, $3.53{\pm}0.49$, and $3.60{\pm}0.51$, respectively. In addition, the mean score of depression was $8.28{\pm}7.48$, $10.97{\pm}7.65$, and $5.50{\pm}5.54$, respectively. It was revealed that a strong negative correlation exists among optimism, emotional intelligence, and depression. This correlation was stronger for undergraduate nursing students than undergraduate non-nursing students. Optimism and emotional intelligence were key factors influencing depression. The degree of this influence was higher for undergraduate nursing students than undergraduate non-nursing students. In conclusion, a program that empowers optimism and emotional intelligence is necessary to manage depression for undergraduate students.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.4
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• pp.633-641
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• 2018

The risk of disasters, such as floods and drought, has increased. Reliable hydrological data is important for analyzing the water resource and designing hydraulic structure to manage these risks. The Yongdam Guryang river catchment located in the central of Korea is the research catchment of K-water and UNESCO IHP, and the hydrological data, such as rainfall, runoff, evapotranspiration, etc. has been observed at the catchment. The aim of this study was to assess the runoff characteristics of the small mountainous catchment of Korea based on the observed hydrological data, and the Probability Distributed Model was applied as the Rainfall-Runoff Model at the Yongdam Guryang river catchment. The hydrological data was divided into the wet period from June to September and dry period from October to May according to data analysis. The runoff ratio was 0.27~0.41 in the wet period and 0.30~0.45 in the dry period. The calibration result by the Probability Distributed Model showed a difference in the calibrated model parameters according to the periods. In addition, the model simulated the runoff accurately except for the dry period of 2015, and the result revealed the applicability of the PDM. This study showed the runoff characteristics of the small mountainous catchment by dividing the hydrological data into dry and wet periods.

• Journal of Korean Society on Water Environment
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• v.32 no.1
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• pp.36-45
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• 2016

Sand filters are widely used in infiltration systems to manage polluted urban runoff. Clogging, which is mainly caused by the deposition of sediments on the filter media, reduces the filter system's infiltration capacity, which further limits its lifespan and function. The physical, chemical and biological clogging characteristics of sand filter, therefore, need to be known for effective design and maintenance. Physical clogging behavior and variations in the characteristics of sand filters according to different media depths are examined in this paper. The variations were observed from laboratory column infiltration tests conducted in a vertical flow and fluctuating head condition. It can be seen that an increase in filter media depth results in a high sediment removal performance; however, it leads to a shorter lifespan due to clogging. In the choice of filter media depth to be used in field applications, therefore, the purpose of facilities as well as maintenance costs need to be considered. At all filter media depth configurations, premature clogging occurred because sediments of 100~250 μm clogged the top 15% of filter media depth. Thus, scrapping the top 15% of filter media may be suggested as the first operational maintenance process for the infiltration system.

• Journal of Global Scholars of Marketing Science
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• v.16 no.3
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• pp.39-60
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• 2006

The purpose of this study is to investigate the effect of two different characteristics of music(tempo) and advertising photograph(type) in a fashion store on consumers' emotional responses and approach behavior and to suggest competitive in-store atmospheric strategies. To test the conceptual model, this study used a video simulation method. Researchers selected a fashion casual wear retail store for young people and videotaped to provide realistic store settings. Two different levels of background music(fast, slow) and advertising photograph(sexy, cheerful) were inserted into the video clip generating four stimuli. Including a stimulus for the control group, 5 video clips were created. A total of 289 subjects answered the questionnaire after viewing a two-minute video clips. The results are as follows: First, advertising photograph in a store had a significant effect on consumers' in-store emotional state, whereas musical tempo did not. Second, the effect of in-store consumers' emotional state on behavioral reponses were investigated. Results showed that consumers' positive emotional state lead to consumers' approach behavior. The results of this study indicated that background music and advertising photograph in a fashion store affected consumers' in-store emotional state, and ultimately these affected consumers' positive approach behavior. Thus retailer should try to create a pleasant store environment using effective store atmospheric factors like background music and advertising photograph.

• Journal of Digital Convergence
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• v.15 no.10
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• pp.293-306
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• 2017

This study conducted non-equality control post-design similar experimental study in order to investigate the effect of self-directed practice through self-reflection by using videos on the basic nursing performance ability, confidence in performance, learning self-efficacy, and practice satisfaction. The experimental group was 57 students and the control group was 56 students in the Department of Nursing in G region. The data was collected from April 1, 2017 to June 14, 2017. For analyzing data, the SPSS 22.0 program was used and the homogeneity test was analyzed with ${\chi}^2$ test, t-test, and Fisher's exact test. Also, independent-test was used. According to the result, all of the experimental groups including the basic nursing performance ability, confidence in performance, learning self-efficacy(t=15.304, p<.001), and practice satisfaction(t=15.304, p<.001) were improved and showed significant differences compared to the control group. As a result, it is predicted that the practice method has a positive effect on participating in self-study and it contributes to active participation by increasing learning motivation of learners. Thus, it is suggested to be applied to various practical training to improve basic nursing skills.

• Geophysics and Geophysical Exploration
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• v.17 no.1
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• pp.21-27
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• 2014

We analyzed response patterns of test field data acquired with new small loop electromagnetic (EM) system using three-dimensional (3D) electromagnetic modeling code. The size and shape of a conductor was adopted as experimental parameters for EM modeling to understand influencing factors of the response patterns due to a metallic object on the seafloor. Obtaining the responses for four models of difference sizes and shapes through 3D EM modeling, we confirmed that the shape of the object have a more critical factor on the response pattern than size. We also calculated "ppm" values with respect to different altitudes of the sensor and source frequencies. The modeling results show that the consistency of sensor altitude is important and imaginary part of ppm response is more sensitive than real part. We also visualized the contour map of the real and imaginary part of ppm value as a function of frequency and altitude so that we can estimate proper altitude for source frequency band of our survey system. The results of this paper are anticipated to give proper parameters in survey construction for seafloor massive sulfide deposit.

• Journal of Korean Society of Steel Construction
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• v.26 no.5
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• pp.485-498
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• 2014

In this paper, vehicle-bridge interaction analysis under a series of moving vehicles to simulate a lane load was performed to estimate impact factor of the main cable, hanger and girder for the selected suspension bridges with 404m and 1545m main span. Korea Bridge Design Code(Limit State Design) was selected for the live model in which KL-510 truck was modeled 6-d.o.f. vehicle and a lane load was simulated by a series of single-axle vehicles. For the 404m main span bridge, hinge-type and floating-type girders at the tower were considered to examine the impact factor according to the connection and supporting type of the girders. The parameters considered herein are the types of live load-a truck only and a truck plus lane load, eccentricity of moving vehicles, road surface roughness and vehicle speed. The road surface roughness was randomly generated based on ISO 8608 and it was applied to the truck only. The impact factors were also evaluated by using the influence line method that is commonly used in cable-supported bridges and compared with those from vehicle-bridge interaction analysis.

• Journal of Environmental Policy
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• v.11 no.4
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• pp.85-105
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• 2012

In this paper, the energy efficiency of wastewater utilities was evaluated to explore ways to save energy via operational measures. The correlation of each wastewater characteristic parameter to energy was assessed to find a set of parameters that explained most of the variations in energy use among utilities. The results show that increases in inflow, influent COD concentration, and ratio of advanced treatment generally increased the energy use. On the other hand, increases in load factor (influentaverage flow/design flow) reduced the energy use. In the regression analysis, the energy efficiency was highest in the A2O advanced process. On the other hand, the membrane process (among the advanced processes) and the contacted aeration process (among the secondary processes) require more efforts in saving energy. However, the data base system related to energy use must be supplemented in order for more accurate analysis of energy consumption in wastewater treatment facilities. In particular, i) electricity consumption of relay pumps and, ii) energy usage per unit process, iii) pump power usage to discharge treated wastewater in a long distance, if necessary, and iv) alternative energy production and utilization status must be recorded. By utilizing the results of the analysis conducted in this study, it is possible to quantify a level of energy savings needed and establish customized energy saving measures to achieve a certain target level for benchmarking a successful case of wastewater utilities.

• Culinary science and hospitality research
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• v.23 no.2
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• pp.23-34
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• 2017

The current study aims to demonstrate the causal relationships of supervisory support, workplace fun, job satisfaction and customer orientation of Y Generational service provider in the Korean hotel industry. In order to achieve the study purpose, the data were collected from 284 hotel employees who were born from 1981 to 2000, which is considered as Generation Y. To analyze the data, frequency, correlation, regression, PROCESS Macro and confirmatory factor analysis were undertaken using SPSS and AMOS version 18.0. The results show as follows: First, factor of workplace fun had a positive influence on job satisfaction and customer orientation. Second, factor of supervisory support had a positive influence on job satisfaction but its effect on the customer orientation was not significant. Third, job satisfaction had a significantly positive effect on customer orientation. Lastly, job satisfaction was revealed as a significant mediator between dependent variables(supervisory support and workplace fun) and customer orientation. Eventually, this study found that the more workplace fun and job satisfaction employees have, the higher customer orientation they show. Supervisory support was revealed as an indirect factor to enhance customer orientation through job satisfaction.

• Journal of the Korea Concrete Institute
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• v.14 no.6
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• pp.934-941
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• 2002

It is important to consider the effect of member size when estimating the ultimate strength of a concrete flexural member because the strength always decreases with an increase of member size. In this study, the size effect of a reinforced concrete (RC) beam was experimentally investigated. For this purpose, a series of beam specimens subjected to four-point loading were tested. More specifically, three different effective depth (d$\approx$15, 30, and 60 cm) reinforced concrete beams were tested to investigate the size effect. The shear-span to depth ratio (a/d=3) and thickness (20 cm) of the specimens were kept constant where the size effect in out-of-plane direction is not considered. The test results are curve fitted using least square method (LSM) to obtain parameters for the modified size effect law (MSEL). The analysis results show that the flexural compressive strength and the ultimate strain decrease as the specimen size increases. In the future study, since $\beta_1$ value suggested by design code and ultimate strain change with specimen size variation, a more detailed analysis should be performed. Finally, parameters for MSEL are also suggested.