• Nuclear Engineering and Technology
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• v.48 no.4
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• pp.1036-1046
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• 2016

We propose a primary water stress corrosion cracking (PWSCC) initiation model of Alloy 600 that considers the stress triaxiality factor to apply to finite element analysis. We investigated the correlation between stress triaxiality effects and PWSCC growth behavior in cold-worked Alloy 600 stream generator tubes, and identified an additional stress triaxiality factor that can be added to Garud's PWSCC initiation model. By applying the proposed PWSCC initiation model considering the stress triaxiality factor, PWSCC growth simulations based on the macroscopic phenomenological damage mechanics approach were carried out on the PWSCC growth tests of various cold-worked Alloy 600 steam generator tubes and compact tension specimens. As a result, PWSCC growth behavior results from the finite element prediction are in good agreement with the experimental results.

• Fire Science and Engineering
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• v.23 no.5
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• pp.196-205
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• 2009

Electric mosquito repellent mats can be ignited by damage of cables, partial disconnection, overload. tracking and so on. In this study, we examined the structure of mosquito repellent mat, positive temperature coefficient(PTC) thermistor, used for heating element and phenomenological characteristics of remains, obtained on the scene of fires. After reappearance ignition test of PTC thermistors, we did comparison analysis them. And we could confine that the feature of heating plate and the shape of bursting were same.

• Perspectives in Nursing Science
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• v.10 no.1
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• pp.77-86
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• 2013

Purpose: The purpose of this study was to describe hospital nurses' lived experience of being a preceptor in Korea. Methods: The data were collected in three focus group interviews with 15 nurses in one general hospital. The phenomenological analytic method suggested by Colaizzi was used to analyze the data. Results: Five theme clusters and 11 themes emerged from the analysis. The five themes include "inevitable rite of passage for an authentic nurse", "facing new role and situations that were difficult to handle", "preceptee-centered preceptorship", "healing connection with colleague nurses", and "enhanced status with competence". Conclusion: The findings of the study provide deep understanding on hospital nurses' positive as well as negative experiences of being a preceptor and should inform the development of a more integrative preceptorship program to empower both preceptees and preceptors.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.7
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• pp.16-22
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• 1995

Electrically-short wire antennas, widely used for mobile communications and EMI measurements, have low rediation efficiency and gain due to the ohmic loss predominant over the radiation power. A very short dipole antenna for wideband EMI measurements has been analyzed using the Method of Moments with the incorporatio of the ohmic loss calculated by the Phenomenological Loss Equivalennce Method(PEM). The calculated results show the rediation gain and efficiency very with the ohmic loss in a wide range of frequencies. Thses results can be effectively used for optimum design of very small antennas and probes for mobile communications and non-disturbing EMI measurements.

• Journal of the Korean Society of Safety
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• v.31 no.3
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• pp.162-167
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• 2016

As the simple empirical and phenomenological model applied to the analysis of leakage and explosion of chemical substances does not regard numerous variables, such as positional density of installations and equipment, turbulence, atmospheric conditions, obstacles, and wind effects, there is a significant gap between actual accident consequence and computation. Therefore, the risk management of a chemical plant based on such a computation surely has low reliability. Since a process plant is required to have outcomes more similar to the actual outcomes to secure highly reliable safety, this study was designed to apply the CFD (computational fluid dynamics) simulation technique to analyze a virtual prediction under numerous variables of leakages and explosions very similarly to reality, in order to review the computation technique of the practical safety distance at a process plant.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.35 no.10
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• pp.11-18
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• 2019

This study explores the relationship between the expression of material Sensibility properties and the meaning of tectonic in the architectural space of Kengo kuma. First of all, It can be derived that The sensibility of the material is based on phenomenological meaning of the tectonic after modern architecture that also Kengo kuma has been aware of. So it derived characteristics of sensibility by material expression and meaning from the Kengo kuma's works including critical books and collection of architecture works. All derived characteristics consist of sub-sections of the case analysis to figure out correlation with expression of Material Sensibility and tectonic meaning at the Kengo kuma's works. At the ends, it was analyzed through the relationship chart.

• International Journal of Advanced Culture Technology
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• v.9 no.2
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• pp.39-46
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• 2021

This study wanted to find out what college students thought about family participated delivery and what concerns they had. To this end, eight college students aged 20 to 25 were interviewed three times. The data collection period was from March 20 to April 10, 2021. Interview materials were collected and interpreted simultaneously using the Giorgi method, a phenomenological research method. As a result of the analysis, 29 semantic units were derived, 12 subcomponents were grouped again, and five categories were formed as final components. The five categories of thoughts on the participated delivery of college students consisted of Responsibility, Happiness, Stability, Shame, and Anxiety. Based on the above meaning, college students were found to be comfortable with their families and to be more comfortable with birth happiness, while also feeling the risk of infection and shame as women. Accordingly, this study suggests that when participating in the delivery of family participation of college students who will be future parents, a systematic protocol will be established to thoroughly prepare for infection and protect women's privacy.

• Structural Engineering and Mechanics
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• v.80 no.5
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• pp.539-551
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• 2021

With the continuous increase of computational capacity, more and more complex nonlinear elastoplastic constitutive models were developed to study the mechanical behavior of elastoplastic materials. These constitutive models generally contain a large amount of physical and phenomenological parameters, which often require a large amount of computational costs to determine. In this paper, an inverse parameter determination method is proposed to identify the constitutive parameters of elastoplastic materials, with the consideration of both strain rate effect and temperature effect. To carry out an efficient design, a hybrid optimization algorithm that combines the genetic algorithm and the Nelder-Mead simplex algorithm is proposed and developed. The proposed inverse method was employed to determine the parameters for an elasto-viscoplastic constitutive model and Johnson-cook model, which demonstrates the capability of this method in considering strain rate and temperature effect, simultaneously. This hybrid optimization algorithm shows a better accuracy and efficiency than using a single algorithm. Finally, the predictability analysis using partial experimental data is completed to further demonstrate the feasibility of the proposed method.

• International Journal of Advanced Culture Technology
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• v.12 no.2
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• pp.227-235
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• 2024

This study was attempted to secure basic data for planning an efficient educational direction by phenomenologically analyzing what they experience as educators by allowing learners to plan and conduct education directly. Participants in the study were eight who voluntarily expressed their intention to participate in the study after taking health education classes between the ages of 20 and 30. Interviews for the study were conducted three times per participant from December 18, 2023 to January 5, 2024, and took an average of 1 hour or more per session. The meaning of the experience of actually carrying out health education derived from Giorgi's phenomenological analysis procedure consists of 5 components(difficult and lacking, confusion and burden, regretful, change, oppurtinity), 11 sub-components, and 37 semantic units. What stands out from the experience of directly teaching is that the participants gained confidence as educators. Based on the results of this study, in order to achieve efficient education, it is suggested to allow learners to conduct classes directly.

• International Journal of Advanced Culture Technology
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• v.12 no.2
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• pp.119-135
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• 2024

The research is centered on veteran educators in the field of early childhood education who possess more than 20 years of teaching experience and have been recognized with awards for their outstanding achievements. The selection of participants was based on specific criteria, such as the number of years of experience and recognition received from the Ministry of Education's Teaching Innovation Competition in Korea. Eight teachers who met the specified criteria were selected to participate in the study. A qualitative phenomenological research study was carried out using semi-structured interviews to gain insight into the experiences and perspectives of the participants. The study identified five main themes: cultivating interpersonal relationships, establishing interactive classroom settings, providing impactful educational methodologies, facilitating healthy habits and character education, and creating a supportive environment for teachers' well-being. The study seeks to improve comprehension of teaching methodologies and offer suggestions for professional development, teacher training, and educational policies.