• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.21-23
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• 2005

Recently, in power system, even though the needs of digital protection relay are highly increased, there are some problem in the field during apply digital protection relay. When the relay are in the fluctuated overload condition, existing algorithm calculate the trip time only with the measured current of just previous stage, and when the load current fluctuate between overload and normal condition, existing algorithm sometimes dose not make the relay trip. This thesis will study about these kinds of existing algorithm problem in digital protection relay, and will suggest the best suited algorithm for digital protection relay in fluctuated overload condition.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.305-307
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• 2003

This paper presents an apparent impedance calculation procedure for distance relaying of transmission line involving FACTS (Flexible AC Transmission System) devices, particularly the UPFC (Unified Power Flow Controller), between Kangjin and Jangheung in Korea. With the changes of UPFC's parameters, the measurement and protective range (trip boundaries) of the adaptive distance relay can also be changed. So, it is the most important part in the field of system protection to analyze the operating characteristic of relaying system. The presence of UPFC significantly affects the trip boundaries which are also adversely affected by fault resistance combined with remote end infeed. This paper presents the apparent impedance calculations and the distance relay setting characteristics for faults involving the UPFC in the KEPCO system.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.616-617
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• 2001

Chejudo, because of its location off the south coast of the Korean peninsula, has a varied marine mollusk fauna. As a preliminary step in an attempt to enumerate and study the mollusks of the island, a field trip was made by the authors to the Songsan Ilchulbang area on february 20, 2001. The purpose of the trip was to survey the mollusk fauna of the shoreline west of Songsan. (omitted)

• Journal of the Korean earth science society
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• v.43 no.3
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• pp.430-445
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• 2022

The purpose of this study was to explore the learning effects in elementary school students who participated in a geological field trip conducted under the theme 'minerals and rocks', focusing on novelty space. A total of 10 sixth-grade students participated in this program held at a public elementary school in Seoul as part of after-school club activities. Students observed mineral and rock samples in a classroom and outdoor learning environment. The authors collected activity papers (texts, drawing), researchers' participation notes, video and audio recordings containing the study participants' activities, and post-interview data To analyze the learning effects in the cognitive domain of students, the observation analysis framework for rock classification of Remmen and Frøyland (2020) and the rock description analysis framework of Oh (2020) were used. Additionally, to explore the learning effects of psychological and geographic areas, students' drawings, texts, discourses, and interview data were inductively analyzed. The results showed that the students demonstrated 'everyday' and 'transitional' observations in the classroom learning environment, while in the outdoor learning environment (school playground, community-based activities), they demonstrated 'transitional' and 'scientific' observations. Moreover, as the scientific observation stage progressed, more types of descriptive words for rocks were used. In terms of psychological and geographic aspects, students showed their selection of places to explore familiar outdoor learning environments, positive perceptions of outdoor learning, and aesthetic appreciation. Finally, this study not only discussed novelty space as a tool for analyzing students' learning effects but also suggested the need for an academic approach considering new learning environments, such as learning through virtual field trips.

• The Research Journal of the Costume Culture
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• v.28 no.4
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• pp.527-543
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• 2020

The aim of this study is develop a state-funded education and training curriculum to contribute to the development of the fashion industry infrastructure. This will be achieved based on the service sector by the competitive clothing sales personnel and fashion startups. The study was conducted using a qualitative research method. The participants were 20 representatives of fashion-related companies and employees from one traditional market and two fashion outlets in Seogu, Gwangju. Data was collected from September 2015 to January 2017 by demand surveys and in-depth interviews. These were conducted on the same day at each clothing store office. In addition, existing literature was also reviewed. The collected data were first summarized into 64 meaning units from which three themes were derived by arranging, classifying, and analyzing the data. The findings of the study are as follows. First, the education and training curriculum for fashion job creation is aimed at job-oriented field-types with the objective of cultivating professional skills for online to offline fashion professionals. Second, the curriculum for fashion advisors was developed to consisted of 8 courses of 150 hours, including job knowledge, a foreign language, fashion-specific knowledge, fashion marketing & VMD, store management know-how, clothing repair, field trip, and internship. Third, the curriculum for fashion entrepreneurs consisted of 8 courses of 106 hours, including entrepreneurship, fashion practice, startup, field trip, finance & taxation accounting, marketing, social enterprise course, and internship.

• Journal of the Korea Safety Management & Science
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• v.17 no.2
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• pp.177-182
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• 2015

Many students can experience, such as for credit and social activities through field trips and participate in field trips. For on-site field training exercise participants currently in Gwangju University They take part in field trip 1, 2, 3 and 4 as the type.. Field Practice 1 type in summer and 2 in winter of 4-week period during vacation holidays with 3 credits, field trips 3 type of 8-week period during vacational holidays with 6 credits recognized for \400,000 in job training fee is also payable by the Leaders in INdustry-university Cooperation Agency. 4 types of job training are fourth grade (Architecture Grade 5) can be employed in conjunction for more than 15 weeks and admitted to the second semester of 15 credits by participating in job training. For most schools, but to pay a fee-job training at the University of Hanyang University, Kyungpook National University has a student assistance in the field training participating companies. This establishment does not have a clear idea of the legal entities responsible in the event of industrial accidents. Academic research is also nonexistent state for them. In this paper, we distinguish the personality for it via the existing labor precedents with respect to the legal responsibility of an industrial accident. This aims at putting the means to establish the role of the University of job training support.

• Journal of The Korean Association For Science Education
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• v.19 no.3
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• pp.461-470
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• 1999

The purpose of this study was to investigate teachers' perception about 'Science Field Trip(SFT) to Korean historical sites'. Ninety-seven teachers were asked to reply the questionnaire about SFT to Korean historical sites. This questionnaire was divided into three parts: educational value, teaching method, and difficulty of management. Firstly, teachers indicated that SFT to Korean historical sites had much educational value in that it could give students chances to understand Korean culture, to acquire investigative process skills, to experience divergent investigation and cooperative learning, to raise integrated thinking skill concerning science and other subjects, and to learn contents related with science curriculum. It also had advantages of caring for students out of school and giving the information for future occupation. Secondly, teachers suggested the desirable teaching method: teachers' explanation about SFT to Korean historical sites with worksheets before it, students' group work during it, and the presentation and discussion after it. Finally, the most frequent answer in the difficulty of management was the lack of teaching materialsfor SFT to Korean historical sites.

• Journal of The Korean Association For Science Education
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• v.35 no.4
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• pp.735-750
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• 2015

The purpose of this study is to draw an educational implication by analyzing the context of narrative texts, students' narrative thinking, and their academic achievement. We investigated text types in students' geological field trip reports, the reason why students favors narrative texts, the relationship between narrative texts and their scientific knowledge recall, and the relationship between narrative thought and academic achievement. All students used expository texts, 82% of them expressed argumentative texts, and 36% of them used narrative texts. It is likely that students use more narrative texts because students were in the context of outdoor activity and so, their emotional feelings were more activated than when they are doing lab activities. The academic characteristics of earth science seemed to contribute more narrative texts in students' reports. The post-test revealed that students with narrative texts recalled better than the others. On the other hand, there were no statistically meaningful differences in academic achievement between the two groups. However, we have noted that female students whose reports contain narrative texts achieved significantly higher scores than female students whose reports are without narrative texts. From in-depth interviews, we found that students who properly used both paradigmatic and narrative mode of thought were in a more advantageous position than those who used narrative thought only. It was also found that some narratively thinking students tended to feel uncomfortable with the way of learning or evaluating questions about science. In the future, a complementary approach of narrative and paradigmatic mode of thoughts would be encouraged by understanding students' tendency of thinking.

• Journal of Korean Society of Transportation
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• v.11 no.1
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• pp.5-22
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• 1993

This study examines the 1980 Census and the 1987 Travel Survey data sets, in order to identify commuting trends in the Seoul Metropolitan Area. The commuting field of Seoul includes the cities and counties contiguous to Seoul, as well as Inchon, Suwon and Ansan City and Paju County. The study finds little support for the expansion of the commuting field toward distant counties of Kyonggi Province; instead an intensification of commuting within the field is more salient. The most prominent trend, within the city limit of Seoul, is that journey-to-work toward the city center has decreased whereas peripheral journeys increased considerably. The work trips have increased most in the southwestern sector of the city; a moderate increase in the northeastern and southwestern sectors; and decreases in the center and the northwestern sector of the city. Factorial analyses of the work trip data also reveal the emergence of sub-regions of journey-to-work in the peripheries of the city. Such a spatial pattern of commuting changes resemble that of population changes, and correspond in part to the layout of the subway system.

• Journal of Electrical Engineering and information Science
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• v.2 no.5
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• pp.60-64
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• 1997

The design process and construction method of a strip line is described for measuring radiated susceptibility of vehicular components having electrical cables more than 2 min length. he characteristic impedance of the trip line was determined 90$\Omega$ to obtain the field uniformity of $\leq$${\pm}$3 dB in the frequency range from 100 kHz to 500 MHz. Tapered coaxial lines were used instead of the traditional lumped circuit element for the impedence matching units, therefore, the strip line has high power capability. Using these techniques, the field uniformity and power capability of a strip line could be considerably improved.