• Korean Journal of Ecology and Environment
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• v.50 no.1
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• pp.137-147
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• 2017

The identity of toxin producers remains only hypothesis unless there were identified by strain isolation and analytical confirmation of both the cyanotoxin production and the genetic identity of the monoculture. The purposes of this study were to identify a morphologic and phylogenetic classification in Aphanizomenon flos-aquae strains isolated from the Nakdong River and to investigate the potential ability of the strains to produce toxins such as saxitoxin and cylindrospermopsin using target genes. The 16S rRNA and sxtA, sxtI, cyrA, cyrJ genes were analyzed on two strains (DGUC001, DGUC003) isolated from the Nakdong River. Morphological features of the strains were observed a shape of aggregated trichomes in parallel fascicles which can reach up to macroscopic size and a hyaline terminal cell without aerotope. In addition, the 16S rRNA phylogenetic analyses showed that the strains were identified as the same species with high genetic similarity of 98.4% and grouped within a monospecific andsupported cluster I of Aphanizomenon flos-aquae selected from GenBank of the NCBI. The cyrA and cyrJ genes encoding for the cylindrospermopsin-biosynthesis were not detected in the present study. The sxtA gene was in detected both the two strains, whereas the sxtI gene which had been suggested as a suitable molecular marker to detect saxitoxin-producing cyanobacteria was not found both the strains. Thus, the two strains isolated from Nakdong River were identified as the same species of Aphanizomenon flos-aquae Ralfs ex Bornet et Flahault 1888, the two strains were confirmed as potential non-producing strains of the saxitoxin and cylindrospermopsin.

• Journal of Korean Elementary Science Education
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• v.43 no.3
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• pp.415-432
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• 2024

This study developed and applied the teacher education model and its principles for science classes using Virtual and Augmented Reality (VR/AR) content and analyzed preservice elementary teachers' feedback on the teacher education model and the changes in their perceptions as to the use of VR/AR content. First, existing Technological Pedagogical Content Knowledge (TPACK) teacher education models and prior studies on the use of the VR/AR contents were reviewed to derive the teacher education model to cultivate the VR/AR-TPACK and set the key principles for each of its stages. The developed teacher education model has five stages: exploration, mapping, collaborative design, practice, and reflection. Second, to examine the appropriateness of the model's five stages and principles, we applied it within the regular course of instruction at the university of education, which was attended by 25 preservice elementary teachers. This study collected data from surveys on the perception of the usage of VR/AR contents before and after the course, as well as the group lesson plans prepared by the preservice teachers, and their feedback on the teacher education model. The feedback on the teacher education model and the survey conducted by the preservice teachers before and after the course were analyzed through open coding and categorization. As a result, most preservice teachers expressed positive opinions about the activities and experiences at each stage of the implementation of the teacher education model. Perceptions related to the usage of the VR/AR content changed in three aspects: first, the vague positive perception of the VR/AR content has changed to a positive perception based on specific educational affordance. Second, they recognized the need for preparedness by anticipating potential problems associated with the use of the VR/AR content. Third, they came to view the VR/AR contents as a useful instructional resource that the teachers could use. Based on these results, we discussed the implications for the VR/AR-TPACK teacher education model and assessed the limitations of the research.

• Korean Institute of Interior Design Journal
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• v.23 no.2
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• pp.62-70
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• 2014

In the knowledge and information society of 21st century, 'Creativity' which is the core of national competitiveness and an important foundation for the development of the country has been emphasized on the importance of it. As a result, the convergence educational programs, as known as STEAM (science, technology, engineering, arts, mathematics) became more and more needed to children for cultivating creativity. As a follow-up study on STEAM program combining robotics and design for children developed by Design Promotion Committee of KIID, this study intends to modify and reanalyze the program and to seize the educational effectiveness of the groups of university students as mentors and children as mentees, The results are as follows; First, although the importance of STEAM education is highlighted, short-term educational programs tend to consist of only the contents of each field: design or science. Second, pre-training and mentoring were helpful to both mentors and children. Third, Children expanded the perception of STEAM concept and increased their interests in career. Mentors recognized the importance and the necessity of STEAM education, and were very satisfied with team activities which gave a new experience of working with other field of people. Therefore, this program provide to children an experience of logical thinking, having interests on uninterested field, and encouraging teamwork. Also, it provides to mentors a chance to develop their potential and experience, and set up a new vision for future.

• Proceedings of the Korea Association of Information Systems Conference
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• 1996.11a
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• pp.5-26
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• 1996

This study has two research objectives related to end-user computing (EUC). One of the research objectives was to investigate the current status of EUC of Korean firms. Another research objective was to examine the relationship between individual differences of end-users and EUC success. Using survey data from 752 end-users of 23 firms, the surrent status of EUC and the relationship between individual differences of end-users and EUC success were investigated. The current status of EUC was examined from six perspectives: 1). what is the characteristics of EUC strategy of Korean firms, 2). what are the individual characteristics of end-users in Korean Firms, #0. what are the characteristics of tasks performed by end-users using computer, 4). what are the application a areas of EUC, 5). How end-users are satisfied with the support of firms, 6). what are system usage and satisfaction of end-users. It was also foud that individual differences of end-users are related to EUC success. More specifically, it wat shown that the male gender, younger age, higher level of education, higher rank and organizational tenure, higher math ability, thinking type of cognitive style, positive and optimistic attitudes toward computer, more experience with computer, more computer education and knowledge are individual differences variables associated with EUC success. The results of stepwise regression analysis suggested that the individual difference variables accounted for 14%, 25%, 39% and 30% of the variances of four EUC success variables, satisfaction for outcome, satisfaction for ability, frequency of computer use, and the number of tasks, respectively. These empirical findings suggest that EUC managers should consider individual differences of end-users in managing EUC, such as education, training, support, and human resource management, to maximize potential benefits of EUC.

• Analytical Science and Technology
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• v.14 no.2
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• pp.123-130
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• 2001

Determination of cadmium(II) ion with a perfluorinated sulfonated polymer-ethylenediamine(nafion-en) modified glassy carbon electrode was studied. It was based on the chemical reactivity of an immobilized layer(nafion-en) to yield complex $[Cd(en)_2]^{2+}$. The reduction peak potential by differential pulse voltammetry(DPV) was observed at $-0.780({\pm}0.005)V$ vs. As/AgCl. The linear calibration curve was obtained in cadmium(II) ion concentration range $5.0{\times}10^{-7}-2.0{\times}10^{-5}M$, and the detection limit(3s) was $2.20{\times}10^{-7}M$. The detection limit of nafion-en modified glassy carbon electrode has been shown about 14 higher sensitivity than a bare glassy carbon electrode.

• The Journal of Information Systems
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• v.5
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• pp.383-409
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• 1996

This study has two research objectives related to end-user computing (EUC). One of the research objectives was to investigate the current status of EUC of Korean firms. Another research objective was to examine the relationship between individual differences of end-users and EUC success. Using survey data from 752 end-users of 23 firms, the current status of EUC and the relationship between individual differences of end-users and EUC success were investigated. The current status of EUC was examined from six perspectives : 1) what is the characteristics of EUC strategy of Korean firms, 2) what are the individual characteristics of end-users in Korean firms 3) what are the characteristics of tasks performed by end-users computer, 4) what are the application areas of EUC, 5) How end-users are satisfied with the support of firm, 6) what are system usage and satisfaction of end-users. It was also found that individual differences of end-users are related to EUC success. More specifically, it was shown that the male gender, younger age, higher level of education, higher rank and organizational tenure, higher math ability, thinking type of cognitive style, positive and optimistic attitudes toward computer, more experience with computer, more computer education and knowledge are individual differences variables associated with EUC success. The results of stepwise regression analysis suggested that the individual difference variables accounted for 14%, 25%, 39%, and 30% of the variances of four EUC success variables, satisfaction for outcome, satisfaction for ability, frequency of computer use, and the number of tasks, respectively. Theses empirical findings suggest that EUC managers should consider individual differences of end-users in managing EUC, such as education, training support, and human resource management, to maximize potential benefits of EUC.

• Korean Journal of Health Education and Promotion
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• v.28 no.2
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• pp.63-73
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• 2011

Objectives: This study was conducted to investigate the relationships between trust and participation in cancer screening. Methods: Data from 2004 Busan Health Survey were analysed for the study. Multiple logistic regression was performed on participation in cancer screening by trust level with potential confounders(sex, age, education, monthly mean household income, subjective health status, smoking, alcohol intake, exercise, and daily eating habits). Results: In a total of 7,423 participants, 2,078(28.0%) were classified as cancer screening participants. High horizontal trust was associated with increased likelihood of cancer screening participation(OR(men) = 1.20, 95% CI 1.00-1.45) and (OR(women) = 1.19, 95% CI 1.02-1.39), after multiple adjustments. Respondents with high trust in health care system had significantly higher odds ratios for participation in cancer screening: 1.60(95% CI 1.27-2.02) among men and 1.18(95% CI 0.97-1.44) among women, after multiple adjustments. Conclusions: Trust was significantly associated with higher odds of cancer screening participation and could be a potent arena for increasing cancer screening participation.

• Journal of Engineering Education Research
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• v.10 no.2
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• pp.5-18
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• 2007

This paper presents a concept of training coursework for engineers in cooperation with the industry combining system, comparing Korea with France. The students, after first two years in a university for the foundation/basic courses, will be centered in the industry, rather than at an academic institution, where field training engineering coursework will be offered in structured or capstone design(problem based learning) formats through the industry. This study on the improvement of the concept has several advantages including the followings ; 1) Industry hiring local-area students who have the potential to be long-term employees; 2) Industry's immediate access to employees with developing engineering skills; 3) On-the-job training reduced industry training costs after graduation; 4) More effective learning through observing complex operations; 5) Students and industry input for continuous improvement of the curriculum; 6) Greater amenability on the part of industry to actively participate in research and development; 7) Increasing in the flow of real research problems for engineering. Finally, the implications for student quality, accreditation, assessment of partnership, academic freedom, and fundraising for scholarships and researches are discussed briefly.

• Journal of Environmental Impact Assessment
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• v.7 no.1
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• pp.71-80
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• 1998

The purpose of this study is to investigate and analyze a conservation state and a sustainable use of coastal wetland in Sindu-ri Tae-an, using the plant community structure analysis and the awareness result of local residents by published paper. To investigate a forest structure in Sindu-ri area, twenty plots were set up and surveyed. The community, is divided by three groups. The divided groups are Robinia pseudoacacia(I), Pinus thunbergii-Robinia pseudoacacia(II), Robinia pseudoacacia(III). Survey site I is simple canopy layer and deteriorative forest. Survey site II is grassland and swamp, where Pinus thunbergii-Robinia pseudoacacia is dominant trees of vegetation. Robinia pseudoacacia is competition species with Pinus thunbergii in survey site II. Survey site III is barren land(sand-hill) where main species is Robinia pseudoacacia. As a result, survey II district is considered as the most suitable for the conservation of species diversity. It is proposed in this paper that the ecological nature trail would be connected in survey site I and II for environmental education. The local residents of Tae-an, where natural environment is well-conserved, prefer conservation to development of the region. In case of Tae-an, where the condition of the natural environment is well conserved and the development potential exists, the development is in harmony with the environmental education program.

• Journal of Educational Research in Mathematics
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• v.11 no.1
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• pp.137-156
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• 2001

IEA's Third International Mathematics and Science Study(TIMSS) from 1994-1995 has placed Korea as one of the top three countries among 45 countries that participated in the study in mathematics achievement for the 3rd, 4th, 7th, and 8th grade students. While the test scores were excellent, the study also showed that mathematics education in Korea needed improvements in student attitudes, technology incorporation, and gender difference in achievement. An analysis of the a survey conducted as part of the mathematics curriculum research program showed that very little progress has been made in these areas for the past 5 years. Moreover, the progressively declining attitudes towards mathematics for high school students is a problematic phenomena for educators as we believe that mathematics is becoming even more important in an information technology based society. A comparison between the top three TIMSS scoring countries (Korea, Singapore, and Japan) and low scored country (U.S.) was made In this paper. We also compare some of problematic results from TIMSS to those from EERI Curriculum Study implemented in 2000. The study shows that simply using technology and improving student attitudes do not necessarily guarantee improved performance. Most of educators agree that potential for technology is great for both changing the way students learn and improving the attitudes of students. However, improperly implemented technology can hinder rather than help the educational process. Therefore, as we begin to implement and use more and moore technology, it is critical to develop the proper curriculum, training for teachers and research programs to track the progress and to make the necessary adjustments to provide the best possible education for our students. Another TIMSS result shows for all four grade levels(3rd, 4th, 7th, 8th), Korea shows the highest gender difference among all the participating countries. TIMSS data such as this is valuable to benchmark all types of information to get a better understanding about what is happening for improvements in math curriculum in Korea. More research needs to be done in comparing the performance of Korean mathematics education to understand both the strengths and weaknesses of our curriculum so that improvements can be made.