• Journal of the Korean Society of School Health
• /
• v.29 no.2
• /
• pp.53-62
• /
• 2016

Purpose: The purpose of this study was to compare the scales measuring adolescent depression. Methods: A cross-sectional survey was conducted using CES-D and RADS-2-K as sales measuring adolescent depression. The participants were 1,217 adolescents from two middle schools located in South Korea. Data were analyzed using SPSS/WIN 21.0. All the items included in the two instruments were analysed through content analysis. Results: The study revealed that the two instruments produced different results in the number of depressive students, depression levels according to subjects' characteristics, and item distribution based on content analysis. The total number of the students belonging to the depression group was 194, including 132 from CES-D and 183 from RADS-2-K. Based on the content analysis covering two categories, general and adolescent depression, the study determined fifteen subcategories in the items of the two scales. Conclusion: In this study, CES-D showed less sensitivity than RADS-2-K in depression levels according to factors relevant to adolescent depression, and both scales had no item for three subcategories of adolescent depression and one subcategory of general depression. The researcher suggests that further studies to evaluate the validity of adolescent depression scales will be useful for helping adolescents with depression.

• Structural Monitoring and Maintenance
• /
• v.9 no.4
• /
• pp.305-321
• /
• 2022

Bridge structural health monitoring with the aim of continuously assessing structural safety and reliability represents a topic of major importance for worldwide infrastructure managers. In the last two decades, due to their potential economic and operational advantages, drive-by approaches experienced growing consideration from researcher and engineers. This work addresses two technical topics regarding indirect frequency estimation methods: bridge and vehicle dynamics overlapping, and bridge expansion joints impact. The experimental campaign was conducted on a mixed multi-span bridge located in Lombardy using a Ford Galaxy instrumented with a mesh of wireless accelerometers. The onboard time series were acquired for a number of 10 passages over the bridge,performed at a travelling speed of 30 km/h, with no limitations imposed to traffic. Exploiting an ad-hoc sensors positioning, pitch vehicle motion was compensated, allowing to estimate the first two bridge bending frequencies from PSD functions; moreover, the herein adopted approach proved to be insensitive to joints disturbance. Conclusively, a sensitivity study has been conducted to trace the relationship between estimation accuracy and number of trips considered in the analysis. Promising results were found, pointing out a clear positive correlation especially for the first bending frequency.

• Journal of the Korea Fashion and Costume Design Association
• /
• v.5 no.3
• /
• pp.7-14
• /
• 2003

Fabrics dyed with artemisia extract have quite natural and elegant tones of color. This study purposed to find the best one for dyeing among artemisia collected in the four seasons in order to develop a more efficient method of dyeing with artemisia. As for the method of research, the researcher dyed wool fabric and silk fabric with artemisia, and measured dyeability according to the number of repeats of dyeing, coloration by post-mordant, color fastness to washing, color fastness to dry cleaning and color fastness to light. The results are as follows. 1. In dyeing with artemisia, dyeability was improved as the number of repeat of dying increased, and it was higher in wool fabric than in silk fabric. 2. Among artemisia collected in the four seasons, autumn artemisia had dyeability much inferior to that of artemisia from the other seasons, and winter artemisia had the best dyeability. 3. According to the result of treating fabric with post-mordant, the dyeability was improved significantly, and coloration was most remarkable when copper and iron mordant were used. 4. The color fastness to washing and color fastness to dry cleaning of fabric mordanted with artemisia were as high as grade 4-5 and grade 5 respectively. The color fastness to light was highest in winter artemisia as grade 4.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.10
• /
• pp.6618-6626
• /
• 2015

This study was designed to explore the factors affecting economic preparations for aging of middle-old aged women. Using fourth Korean retirement and income study panel data of National Pension Reacher Institute. The researcher explored the characteristics of preparation for the old age life who middle-old aged women and analyzed the factors affecting economic preparations for aging of middle-old aged women. The results were as follows. The the factors affecting economic preparations for aging of middle-old aged women were education level, subjective health status, a number of adolescent children(14-19), a number of adolescent children(20-39), public pension, financial asset and debt. On the basis of this results, suggestions for policy were offered.

• Journal of Information Science Theory and Practice
• /
• v.4 no.1
• /
• pp.6-20
• /
• 2016

Scholarly communication plays a significant role in the development and dissemination of research outputs in library and information science (LIS). This study presents findings from a survey which examines the key attributes that characterize the publishing by Pakistani LIS scholars, i.e. academics and professionals, in national journals. A pilot-tested, electronic questionnaire was used to collect the data from the target population. 104 respondents (or 69.3% of target) provided feedback on areas such as number of articles published, number of citations, and the nature of any collaboration with other authors. The findings of this survey revealed that, among the various designated regions of Pakistan, the Punjab region was the most highly represented. In articles published in national journals, there was a clear preference among all respondents to collaborate with at least one other author. The citation metrics for LIS articles in national journals were relatively low (30.22%), which aligns with Scimago’s Journal and Country Rankings. The uptake of social scholarly networks mirrors international trends. Respondents were asked to score factors which could impact negatively on their ability to undertake research and/or publish the results. The study recommends that concerned stakeholders work together, as appropriate, to address concerns. In addition, it recommends that further research be undertaken to define patterns of Pakistani co-authorship in the social sciences.

• Journal of the Korea Society of Computer and Information
• /
• v.27 no.9
• /
• pp.279-286
• /
• 2022

The purpose of this study is to present a case of the development and application of a one-time special lecture program that requires the use of computers in frontline elementary and secondary schools. For this purpose, the researcher developed an Arduino-based special lecture program that works as a teaching tool to help with the functions of a student PC with a Raspberry Pi. This special lecture program was applied at three elementary and middle schools near K-University, and then the program was evaluated. The results of this study are as follows. First, the researcher developed a teaching aid for PC functions to be used in special lectures. Second, teaching and learning materials for visiting special lecture education programs using Arduino were developed. Third, in the special lecture, a teaching-learning method was used to guide a small number of students individually. Fourth, the special lecture program resulted in high satisfaction. The results of this study can be a useful reference for teachers who plan one-time special lecture programs requiring computers or for those who want to apply physical computing-related devices in an educational field.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1994.10a
• /
• pp.267-272
• /
• 1994

This work presents a method of optimum design for reinforced concrete building frames with rectangular cross sections. The optimization techniques used is based on the principle of divided parameters. The design variable parameters are divided into two groups, external and internal, and the optimization is also divided into external and internal procedure. This principle overcomes difficulties arising from the presence of two materials in one element, the property peculiar to reinforced concrete. Several search algorithms are tested to verify their accuracy for the external optimization. Among them pattern search algorithms has been found consistent. This work proposes a new method, modified pattern search, and a number of sample problems prove its accuracy and usefulness. Exhaustive search for all local minima in the design spaces for two sample problems has been carried out to understand the nature of the problem. The number of local minima identified is quite more than expected and it has become understood that the researcher's task in this field is to find a better local minimum if not global. The designs produced by the method preposed have been found better than those from other method, and they are in full accord with ACI Building Code Requirments(ACI 318-89).

• Journal of Mechanical Science and Technology
• /
• v.19 no.5
• /
• pp.1169-1181
• /
• 2005

Experimental and numerical studies on the unsteady wake field behind a square cylinder near a wall were conducted to find out how the vortex shedding mechanism is correlated with gap flow. The computations were performed by solving unsteady 2-D Incompressible Reynolds Averaged Navier-Stokes equations with a newly developed ${\epsilon}-SST$ turbulence model for more accurate prediction of large separated flows. Through spectral analysis and the smoke wire flow visualization, it was discovered that velocity profiles in a gap region have strong influences on the formation of vortex shedding behind a square cylinder near a wall. From these results, Strouhal number distributions could be found, where the transition region of the Strouhal number was at $G/D=0.5{\sim}0.7$ above the critical gap height. The primary and minor shedding frequencies measured in this region were affected by the interaction between the upper and the lower separated shear layer, and minor shedding frequency was due to the separation bubble on the wall. It was also observed that the position (y/G) and the magnitude of maximum average velocity $(u/u_{\infty})$ in the gap region affect the regular vortex shedding as the gap height increases.

• Journal of Broadcast Engineering
• /
• v.23 no.1
• /
• pp.36-44
• /
• 2018

VR(Virtual Reality) and AR(Augmented Reality) devices are becoming more common, and the need for proper contents presentation techniques in such environments has been growing ever since the popularization of the devices. One of the contents is the spatio-temporal data, which has become more prominent since it could be both generated and consumed by a large number of ordinary users. In this work, the researcher analyzed the characteristics of spatio-temporal data as a source for visualization in VR and AR environment, and categorized prior visualization methods for such data, which were devised for traditional monitors. The researcher also reviewed the hardware specification of state-of-the-art devices, and examined the possibility of adopting the previous visualization approaches. This work is expected to contribute in designing spatio-temporal visualization for VR and AR environment by utilizing their unique characteristics.

• Journal of the Korean Society of Radiology
• /
• v.10 no.2
• /
• pp.89-99
• /
• 2016

The purpose of this study is to identify and analyze factors that are affecting radiologists' turnover intention. For the purpose, this researcher surveyed 200 radiologists who were serving at secondary medical institutions located in Busan. For the survey, the researcher used a structured questionnaire. Findings of the study can be summarized as follows. This study show that in order to reduce radiologists' turnover, it is necessary to develop effective personnel management strategies that can make internally motivated radiologists, raise their job satisfaction and organizational concentration and reduce their job stress. Radiologists' turnover rate would not decline if such problems as excessive workload, lack in the number of persons of the same profession and unfair personnel management system are not solved and if no efforts are made to remunerate at reasonable levels, provide more opportunities of promotion and raise job satisfaction. These solutions to prevent radiologists' turnover could be successful only when officially supported by hospitals.