• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.110-112
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• 2006

Membrane electrode assembly (MEA) for polymer electrolyte fuel cell (PEFC) are commonly prepared in the research laboratory by spraying, screen-printing and brushing catalyst slurry onto membrane or other support material like carbon paper or polyimide film in a batch style. These hand applications of the catalyst slurry are painstaking process with respect to precision of catalyst loading and reproducibility. It has been generally mentioned that the adoption of continuous process is very helpful to develop the reliable product. In the present work, we report the results of using continuous type coater with doctor-blade to coat catalyst slurry for preparing the MEA catalyst layers In a faster and highly reproducible fashion. We show that while expectedly faster than batch style, the machine coater requires the use of slurry of appropriate composition and a properly selected transfer decal material in order to achieve superior MEA plat lnw loading reproducibility. To make highly viscous catalyst slurry that is imperative for using coater, we use 40wt.% Nafion solution and minimize the content of organic solvent. And the choice of proper high surface area catalyst is important in the viewpoint of making well-dispersed slurry. After catalyst coating onto the support material, we transferred the catalyst layer to both sides of Nafion membrane by hot-pressing In this case, the degree of transfer was Influenced by hot-pressing condition including temperature, pressure, and time. To compare the transferring ability, we compared so many films and detaching papers. And among the support, polyethylene terephthalate(PET) film shows the prominent result.

• Journal of KIISE
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• v.42 no.7
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• pp.840-845
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• 2015

In recent years, Big Data has been a topic of great interest for the production and operation work of offshore plants as well as for enterprise resource planning. The ability to predict future equipment performance based on historical results can be useful to shuttling assets to more productive areas. Specifically, a centrifugal compressor is one of the major piece of equipment in offshore plants. This machinery is very dangerous because it can explode due to failure, so it is necessary to monitor its performance in real time. In this paper, we present stream data processing architecture that can be used to compute the performance of the centrifugal compressor. Our system consists of two major components: a virtual tag stream generator and a real-time data stream manager. In order to provide scalability for our system, we exploit a parallel programming approach to use multi-core CPUs to process the massive amount of stream data. In addition, we provide experimental evidence that demonstrates improvements in the stream data processing for the centrifugal compressor.

• The Journal of the Korea Contents Association
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• v.19 no.10
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• pp.11-20
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• 2019

The purpose of this research is to investigate the experience for behavior intervention and awareness of positive behavior support among beginning special education teachers. For this, 5 special education teachers with less than 2 years of experience participated in this research. One-on-one in-depth interviews were carried out with them, and all interview results were transcribed and analyzed according to the constant comparison method resulted in 4 major themes follows: 'motivation', 'a series of choice', 'regret for intervention' and 'awareness of Positive Behavior Support'. also, 9 sub themes follows: 'educational needs', 'living needs', 'starting intervention', 'process of intervention', 'results of intervention', lack of resources', 'lack of communication', 'new attempts', 'new areas'. During a discussion, requests for behavior intervention and awareness of positive behavior support, which had been drawn in the research results, were discussed, and the limitation of this research was suggested.

• Journal of the Korea Society of Computer and Information
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• v.17 no.2
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• pp.231-239
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• 2012

A company's reliance on plants is growing in the area of production and service. Therefore, the importance of the work on plants in order to manage them efficiently is growing. Effective plant management increases the durability and efficiency of the plant. An organized BSC also increases the workers' will to work harder which is to bring the higher quality of plant management. In this way, however, it has studied with variety ways to assess plant management task for performance evaluation, there is a little deficiency that the study of methodical performance evaluation that based on the some strategies. The BSC, the very way, and it has been utilized in balanced and methodical performance evaluation means in widespread fields with strategy as the center to get visions. In this study, I have developed the performance evaluation system for plant management, appling BSC concept.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.4
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• pp.269-296
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• 2018

The purpose of the study is to examine prospective librarians' library practicum experiences by using Giorgi's descriptive phenomenological method. To achieve the purpose of the study, the study conducted in-depth interviews with the participants of the library practicum in the department of library and information science at the A university. Following Giorgi's four ways of phenomenological description, the study analyzed the collected data from in-depth interviews with the participants. Prospective librarians' library practicum experiences were able to analyze as five significant themes and seventeen sub-categories of the themes. The five main themes are as followings: 'formulating perception of libraries and librarians', 'formulating career design through self-development and challenges', 'growth and challenges in preparing the library practicum', 'growth and challenges in the middle of library practicum' and 'experiences after the library practicum and the evaluation.' On the basis of the findings, the study suggested alternative programs of library practicum and the directions for performing the programs effectively and efficiently.

• The Journal of the Korea Contents Association
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• v.19 no.7
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• pp.149-165
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• 2019

The purpose of this study is to conduct an in-depth interview on 5 middle aged women who have attempted suicide in the past and to explore their suicide attempts and the vivid empirical value of life after the attempt. The collected data were analyzed using Giorgi's phenomenological approach. The data analysis resulted in 21 sub categories and 7 essential categories. Study participants experienced an-'selected death at the end of a cliff', 'standing on the border of life and death', 'life became clear after escaping delusion', 'working toward life once again', 're-evaluating their past life and discovering new possibilities', 'experiencing the vividness of life here', 'spiritual growth and deeper insight'. Such results offer a discussion on existence toward self-completion, and hold significance in that it increased our in depth understanding and recognition beyond the narrow perceptions of individuals who attempt suicide.

• Journal of Digital Convergence
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• v.19 no.4
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• pp.305-317
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• 2021

By examining the experience of residential child care staffs, this study explored the multifaceted aspects of inclusive care and discussed the direction of successful inclusive education implementation in residential child care facilities. Interviews were conducted with 10 care staffs experienced inclusive education at residential child care facilities, and qualitative case study method was used to analyze transcribing data. Care staffs were reluctant to carry out inclusive education. They felt guilty due to not enough care either for disabled or non-disabled children in the process of adapting to inclusive education. They were calling for immediate communication channels to get the necessary support on time. They also recognized needs for professional education for care staffs regarding care of disabled children, and to dispatch special education teachers. It was found that all participants in the study disagreed on three-shift policy. Lastly, the support measures according to the multifaceted aspects of inclusive care in residential child care facilities were discussed.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.471-479
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• 2021

The purpose of this study is to find out what meanings would be brought to the old females' lives, who took part in the line dance as programs for senior's health. 6 the old females were selected. Research materials were gathered from in-depth interviews and observations by researcher. As a result of content analysis, the following conclusions were drawn. First, elderly's motives for participation in line dance were found to be solicitation of the surroundings, recovery and maintenance of health, and participation in pursuit of happiness. Second, the elderly's line dance experience was changed the perception of dance. Third, line dance improved interest and confidence in the body and appearance. Fourth, the line dance experience provides a space for making new friends. Fifth, the line dance experience improved a sense of accomplishment and immersion through dance. Sixth, the support and praise of the family increased self-esteem and improved overall life satisfaction and happiness.

• The Journal of Korean Academy of Sensory Integration
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• v.20 no.1
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• pp.39-54
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• 2022

Objective : The purpose of this study was to identify the experiences of novice occupational therapists working at a child private clinic center in the clinical experience process of sensory integration therapy and to understand the adaptation process in child private clinic center. Methods : The participants were four occupational therapists with less than 1 year of clinical experience. Data collection was conducted through in-depth interviews, and the recorded interview responses were transcribed and analyzed. The analysis of the data was made by phenomenological analytic method suggested by Giorgi. Results : As a result of analyzing the adaptation process of novice occupational therapists working at the child private clinic center, 3 categories, 6 themes, and 16 main meanings were derived. Novice occupational therapists experienced difficulties arising from clinical, obstacles from the working environment, positive factors inside the center, support from outside the center, self-effort, and changes through adaptation experience. Conclusion : Along with changes to the social system and pediatric rehabilitation institution, one's own effort are also required so that novice child occupational therapists working at child private clinic centers can adapt and perform at their roles.

• Journal of the Microelectronics and Packaging Society
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• v.30 no.2
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• pp.60-64
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• 2023

In this study, the electrical contact resistance characteristics between graphene and metals, which is one of important factors for the performance of graphene-based devices, were compared. High-quality graphene was synthesized by chemical vapor deposition (CVD) method, and Al, Cu, Ni, and Ti as electrode materials were deposited on the graphene surface with equal thickness of 50 nm. The contact resistances of graphene transferred to SiO₂/Si substrates and metals were measured by the transfer length method (TLM), and the average contact resistances of Al, Cu, Ni, and Ti were found to be 345 Ω, 553 Ω, 110 Ω, and 174 Ω, respectively. It was found that Ni and Ti, which form chemical bonds with graphene, have relatively lower contact resistances compared to Al and Cu, which have physical adsorption properties. The results of this study on the electrical properties between graphene and metals are expected to contribute to the realization of high-performance graphene-based devices including electronics, optoelectronic devices, and sensors by forming low contact resistance with electrodes.