• Journal of Dairy Science and Biotechnology
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• v.41 no.3
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• pp.126-137
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• 2023

In this study, we isolated lactic acid bacteria from Allium wakegi and examined the usability of culture supernatants obtained from these lactic acid bacteria. The antibacterial activity of the culture supernatant obtained from the isolated lactic acid bacteria against the pathogens Escherichia and Salmonella spp. was measured. The obtained lactic acid bacteria culture medium showed significant antibacterial activity against pathogenic bacteria in a dose-dependent manner. The effects of pH and heat denaturation on the observed anti-pathogenic bacterial activity was also investigated. Adjusting the culture supernatant to pH 7 resulted in loss of all antibacterial activity against pathogenic bacteria, suggesting that the antibacterial activity of the obtained culture supernatant against pathogenic bacteria is influenced by organic acids. Assessment of the heat stability of the anti-pathogenic bacterial activity revealed that heat treatment did not diminish activity. The obtained lactic acid bacteria culture medium is thus stable against heat.

• Journal of Dairy Science and Biotechnology
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• v.41 no.4
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• pp.191-202
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• 2023

In this study, lactic acid bacteria (LAB) was isolated from blueberries. The isolated LAB were rod-shaped and gram-positive, as shown using gram staining. In addition, the identified bacteria showed high homology to Lactiplantibacillus argentoratensis. The culture supernatant was isolated from L. argentoratensis and its antibacterial activity against the pathogenic bacteria Salmonella and Escherichia was analyzed. Culture supernatants of L. argentoratensis significantly inhibited the growth of Salmonella. Enteritidis NCCP 16947, Salmonella Typhimurium NCCP 16960, and Salmonella. Thompson NCCP 11704. Interestingly, the higher the concentration of the culture supernatant, the more significant was the antibacterial activity. Additionally, the culture supernatant of L. argentoratensis showed significant antibacterial activity against Escherichia strains. To determine whether the antibacterial substance is stable to heat and pH, the LAB culture supernatant was heat-treated under 65℃ for 30 min, 75℃ for 15 min, 85℃ for 10 min, and 100℃ for 5 min. Measurement of antibacterial activity against pathogenic strains by adding 5% of heat-treated culture medium showed the same antibacterial activity as before heat treatment. However, in a test where the pH of the culture supernatant was adjusted to 7.0 from 3.73, no antibacterial activity was observed.

• Journal of the Korea institute for structural maintenance and inspection
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• v.28 no.1
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• pp.24-31
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• 2024

Mortar has been applied in most previous studies on 3D concrete printing. In such cases, however, the economic efficient cannot help decreasing due to higher binder contents and larger amount of fine aggregates. In order to enhance the applicability of 3D printing technology to construction industry, therefore, 3D concrete printing technology utilizing coarse aggregates needs to be developed further. This study aims at proposing the mix design process of concrete containing coarse aggregates for 3D printing. Based on extensive literature review and experimental studies, the mix proportion suitable for 3D printing has been derived, and the extrudability of concrete with coarse aggregates has been verified through 3D printing tests. The primary variable of the extrudability tests was the contents of viscosity modifying agent (VMA), and the extrudability was quantitatively evaluated by measuring dimensions, distribution of aggregates, and surface quality of 3D-printed filaments. The test results showed that the dimensional suitability and surface quality were improved as the VMA contents were larger, and the coarse aggregates were evenly distributed in the section of filament regardless of the VMA contents. Based on the test results, the mix design process for concrete containing coarse aggregates for 3D printing has been proposed.

• Smart Media Journal
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• v.13 no.2
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• pp.52-61
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• 2024

In the shipyard, aerial images are acquired at regular intervals using Unmanned Aerial Vehicles (UAVs) for the management of external storage yards. These images are then investigated by humans to manage the status of the storage yards. This method requires a significant amount of time and manpower especially for large areas. In this paper, we propose an automated management technology based on a semantic segmentation foundation model to address these challenges and accurately assess the status of external storage yards. In addition, as there is insufficient publicly available dataset for external storage yards, we collected a small-scale dataset for external storage yards objects and equipment. Using this dataset, we fine-tune an object detector and extract initial object candidates. They are utilized as prompts for the Segment Anything Model(SAM) to obtain precise semantic segmentation results. Furthermore, to facilitate continuous storage yards dataset collection, we propose a training data generation pipeline using SAM. Our proposed method has achieved 4.00%p higher performance compared to those of previous semantic segmentation methods on average. Specifically, our method has achieved 5.08% higher performance than that of SegFormer.

• Therapeutic Science for Rehabilitation
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• v.13 no.1
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• pp.23-34
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• 2024

Objective : This study aims to compare the awareness of adolescent occupational therapy (AOT) among university students majoring in occupational therapy (OT) in Korea and the United States through an online survey. Methods : This online survey was conducted from January 9 to 13, 2023 to investigate the awareness about AOT among 55 students majoring in OT in Korea and the United States. An online survey was formulated in Korean and English. Data analysis was performed using descriptive statistics and an independent t-test. Results : In response to the question "Have you ever heard of AOT?", 65.5% of Korean students answered yes and 58.2% of the United States students answered no. In both countries, the average score for the question "Can AOT help improve the quality of life of teenagers?" was the highest, while the score for "Is AOT sufficiently advanced in your country?" was the lowest. For "Potential for future development of AOT," the scores for the two countries showed a significant difference (p < .05). Conclusion : Students in both countries acknowledged the necessity and importance of AOT, but there were differences noted in terms of prospects of the therapy.

• Journal of the Korea Convergence Society
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• v.9 no.8
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• pp.211-217
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• 2018

The purpose of this study is to provide basic data for the development of dental hygiene education by analyzing factors affecting academic self-concept of dental hygiene department students. This study was conducted a questionnaire survey of 168 people who explained and agreed on the purpose of the study from October 10 to October 21, 2016. As a result of this study, the professional image of the dental hygienist had a positive effect(${\beta}=.43$, p<.001) on the major satisfaction of the dental hygienist, and the major satisfaction had a positive influence(${\beta}=.38$, p<.001) on the academic self-concept. Therefore, in order to motivate students' dental hygiene education, it is necessary to improve their major satisfaction and institutional improvement to improve the professional image of dental hygienists recognized by students.

• Journal of the Korea Convergence Society
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• v.9 no.9
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• pp.97-104
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• 2018

The purpose of this study was to investigate the expectation toward medical artificial intelligence(AI) of students in majoring health, and to utilize it as a basic data for widespread use of medical AI for 500 students majoring in health science at Cheonan city. The awareness of AI was 18.6%, the reliability of AI was 24.8%, and agreement to use of medical AI was 38%. Also, the higher the awareness and reliability of AI were, the higher the expectation of AI was. As a result, education on medical AI in the major field should be a cornerstone for the development of an effective healthcare environment utilizing medical AI by raising awareness, reliability and expectation of AI.

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.121-129
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• 2018

This study is to analyze and evaluate the factors affecting the selection satisfaction of major of radiology students. After conducting a questionnaire survey on radiology students, we conducted t-test and multiple regression analysis. There was a significant difference between the preference and current factor among the selection of department. There were significant differences in clinical practice between practice environment, practice guidance, practice time and evaluation, satisfaction after practice, and employment. There were significant differences in curriculum framing, professor teaching and evaluation, support facilities, education system satisfaction, and curriculum satisfaction. As a result, it is necessary to develop system for increasing satisfaction with student's major selection and to improve the quality of education.

• Journal of the Korea Convergence Society
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• v.10 no.1
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• pp.265-275
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• 2019

The purpose of this study was to explore factors that physical education graduate students in graduate school of education drop out of teacher appointment examination of secondary school by using Ecological Model. The in-depth interview was conducted for 10 physical education graduate students studying in school of education. As an aspect of the intrapersonal component, the effort to apply how participants'current job positively affects their preparation for teacher appointment examination is required and they need to clearly decide academic priorities to prepare for teacher appointment examination. As an aspect of interpersonal component, participants are negatively affected by subjective norm, thereby providing personalized mentoring program is required. As an aspect of organizational component, limited tuition support and inappropriate place to study are emphasized, so practical helps like sports practice instructor or teacher appointment examination preparation class is required. Finally, this study suggests the introduction of integrated system for teacher appointment examination.

• Journal of the Korea Convergence Society
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• v.10 no.7
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• pp.163-168
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• 2019

The purpose of this study is to find out latent needs of users through the difference of information inflow between design major and engineering major reflecting car lifestyle and to complement them. Although those two relationship deepens due to the development of industrialization, collaboration is still a difficult situation. To find out lifestyle of between those two majors, experiments were carried out quantitatively by conducting in-depth interviews and additionally survey were conducted concurrently. The results showd clearly difference in meaning and value of the automobile. This phenomenon is related to identity. The designers expressed themselves by car, and others differed by using their cars as a means of mobility.