• Journal of the Korean Society for Precision Engineering
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• v.19 no.2
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• pp.114-125
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• 2002

As semi-solid forging (SSF) is compared with conventional easting such as gravity die-easting and squeeze casting, the product without inner defects can be obtained from semi-solid forming and globular microstructure as well. Generally speaking. SSF consists of reheating, forging, ejecting precesses. In the reheating process, the materials are heated up to the temperature between the solidus and liquidus line at which the materials exists in the form of liquid-solid mixture. The process variables such as reheating time, reheating temperature, reheating holding time, and induction heating power have much effect on the quality of the reheated billets. It is difficult to consider all the variables at the same time when predicting the quality. In this paper, Taguchi method, regression analysis and neural network were applied to analyze the relationship between processing conditions and solid fraction. A356 alloy was used for the present study, and the learning data were extracted by the reheating experiments. Results by neural network were on good agreement with those by experiment. Polynominal regression analysis was formulated by using the test data from neural network. Optimum processing condition was calculated to minimize the grain size, solid fraction standard deviation, otherwise, to maximize the specimen temperature average. In this time, discussion is liven about reheating process of row material and results are presented with regard to accurate process variables for proper solid fraction, specimen temperature and grain size.

• Journal of Educational Research in Mathematics
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• v.13 no.4
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• pp.463-483
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• 2003

In the learning of mathematics, students experience the semiotic activities of representing and interpreting mathematical signs. We called these activities as the representing and interpreting of mathematical signs. On the foundation of Peirce's three elements of the sign, we analysed that students constructed the representamen to interpret the concept of correlation as for the object, "as one is taller, one's size of foot is larger" 4 middle school students who participated the gifted center in Seoul, arranged the statistical data, constructed their own representamen, and then learned the conventional signs as a result of the whole class discussion. In the process, students performed the detailed representing and interpreting of signs, depended on the templates of the known signs, and interpreted the process voluntarily. As the semiotic activities were taken place in this way, it was needed that mathematics teacher guided the representing and interpreting of mathematical signs so that the representation and the meaning of the sign were constructed each other, and that students endeavored to get the negotiation of the interpretants and the representamens, and to reach the conventional representing.

• The Journal of Korean Medicine
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• v.29 no.1
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• pp.25-38
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• 2008

Objectives : Integrative medicine in Korea is the 21st century-style medical practice of two orthodox medical doctrines, traditional Korean medicine and western conventional medicine, as well as complementary and alternative medicine (CAM). CAM with scientific evidence should be incorporated in undergraduate curricula for the purpose of Korean integrative medicine. Methods : Items of detailed objectives, syllabi, textbooks, instructor's experiences, and effectiveness and reason for difficulty of the CAM curriculum for undergraduate students were analyzed and the preference of CAM therapies and others were also evaluated. Results and Discussion : The effectiveness of this CAM class curriculum was high (8.0$\pm$1.4) enough to be used in other Oriental medical colleges. Development of ability for self-study was rated as 7.0$\pm$1.7 and the helpfulness for clinical use was marked as 6.8$\pm$1.9. Students preferred placebo, Ayurveda, aromatherapy, yoga, functional food, bio-feedback and homeopathy. The difficulty degree was 7.2$\pm$1.6, and the amount of content was suggested as the major reason for it. We also found that this curriculum can be a model for self-oriented study and problem-based learning. Discussions were made for the improvement of the implemented CAM curriculum, which was shown to be very effective for the achievement of Korean integrative medicine. Conclusion : We have successfully installed a CAM curriculum for undergraduate students at the College of Oriental Medicine, and it can be used in others.

• Journal of Educational Research in Mathematics
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• v.25 no.3
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• pp.347-366
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• 2015

There are a lot of causes of under-achievement in elementary mathematics, one of which may be lack of previous learning elements. We focus on the understanding of place value. The purpose of this study is to analyze underachievers' levels of understanding of place value concepts and to find the types of place value tasks that they have had special difficulty. For this purpose, an individual test called as "the Six Tasks of Place Value(SToPV)"was applied to ten third grade mathematics underachievers in elementary school. The test is a type of place value concept tests and requires one-on-one interview with some preparation materials. The participants' reactions were analysed according to the framework by Berman(2011). The result of analysis shows that third grade mathematics underachievers tend to have a great difficulty understanding the place value concepts. Also the types of difficult tasks were various from individual to individual. Based on the test results and discussion, we suggested some implications for diagnosing place value concepts of mathematics underachievers.

• Korean Institute of Interior Design Journal
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• v.14 no.6 s.53
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• pp.252-259
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• 2005

A modern museum has been changed from a passive place for simply exhibiting arts and antique collections to an interactive place for learning and experiencing culture and information. Such a functional change of the modern museum requires not only reorganizing fundamental characteristics of the modern museum, but also reforming organization of management teams, changing attitudes of staffs and assigning new roles to staffs for accepting the new thought and approach of visitors. That is, the function of the modem museum is not limited to collect arts and antique collections. The fundamental change of the modern museum further requires using the collections as a tool or a medium to provide a cultural exchange between the visitors and the museum, and to give new experience and information to the visitors. After proposing discussion that ' how, what, who is related to the museum? ', the way of thinking the museum is changed from ' collection ' to ' communication '. The change of the modern museum improves an educational role of the museum, and makes the museum as a communicator exchanging information and experience with visitors. In the last analysis, the modern museum is not just an exhibition medium that simply transfers information of the exhibition mediums to public. The modem museum is also a communication medium in order to collect information and transfer the collected information to the visitors. That is, the modern museum should provide various exhibition and communication mediums to the visitors for exchanging information and cultural experience. Therefore, the modern museum requires additional functions processing information suitable to the present environment and level of the museum, and transferring the information to public.

• The Journal of the Korea Contents Association
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• v.16 no.10
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• pp.267-276
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• 2016

This study was conducted to explore the possibilities of educational use of social curation service, which is the third-generation social networking service called the "matters of interest type." To this end, the study selected nine college students, then have them use social curation service for about 50 days, and analyzed their responses by performing the focus group interview (FGI). As a result of the analysis, social curation service was found to have strong points, including collection of various types of information, classification and summary through creation of my own category, possibility of constant updating of matters of interest, and reduction of relative deprivation compared to existing social networking services. To solve these issues, constant promotion was needed. From the aspect of educational use, it was found that social curation service had possibilities for individuals and teams: For individuals, the service enabled voluntary search and use of information, configuration of my own data, and facilitation of self-directed learning. For teams, it enabled discussion and presentation activities through sharing.

• The Journal of the Korea Contents Association
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• v.9 no.8
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• pp.423-432
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• 2009

This paper focuses on gender studies with respect to language education for KFL(Korean as a foreign language) students. It also attempts to view the role of gender as exerting influence on language learning and teaching, and surveys KFL teachers' awareness of the role of gender in Korean language education. It is conceivable that teachers who are aware of differences between female and male will be able to take these into account in their teaching; in doing so they will be more effective in their teaching than if they were to teach in ignorance of these differences. The survey for the teachers' awareness of gender difference was conducted through teachers' discussion as the follow-up measure of the questionnaire. A few teachers do not have a clear idea about the importance of gender differences in language teaching, but the majority have cognizance of the matter. For this research, a questionnaire was administered to 71 subjects, consisting 37 intermediate KFL students and 34 advanced KFL students. The result of the questionnaire reveals that 50.4% subjects use their words and intonation without recognizing the gender difference, on the other hand, 49.6% subjects recognize the gender differences in Korean language use. The result should be adopted as a sociolinguistic factor for the contents of second language education.

• The Journal of the Korea Contents Association
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• v.9 no.1
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• pp.465-474
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• 2009

The emergence of the digital age has changed the paradigm of education. Recently, the new paradigm needs new digital books that contain more interactive contents. Our goal is to design the digital textbook with convenient interfaces and cutting effects for interactive and effective education. To achieve these goals, we propose interfaces and contents which are designed after a lot of discussion with educational experts. In the implementation step, cutting algorithm is proposed to generate the cut planes of the 3D objects, based on the free strokes specified by the users. In order to test the performance of the contents, the testbed was implemented so that students try our digital book and present their evaluation results on the convenience and the effectiveness.

• Journal of the Korean Society for information Management
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• v.26 no.2
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• pp.65-82
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• 2009

This exploratory study describes the social bookmarking perceptions and behaviors of students in university courses. Although an emerging discussion regarding the value of social bookmarking tools exists, how users adopt tools in practice is not well known. Students were asked to utilize the bookmarking tool del.icio.us to store information relating to course projects. They were also asked to comment how they employed del.icio.us for course projects. The study analyzed student perceptions and behaviors when using social bookmarking tools for university coursework. The study noted that the use of tags, notes, and networking within these social bookmarking tools remained less active and social bookmarking services in Web 2.0 as shared collaboration, shared communities, and vertical search were less present. Utilizing social bookmarking tools to facilitate personal information management includes the activities of information use, information re-use, and mobility.

• Hwankyungkyoyuk
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• v.9 no.1
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• pp.72-89
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• 1996

Environmental problem and eco-crisis don't mean pollution itself any more, although general people have believed that environmental problems can be resolves by removing pollution. The mos important is environmental problems are linked with social structure which individualism, rationalism is extremely prevailed in the market oriented capitalism society, so public value is ignored especially. In the point of environmental education, this is very important because environmental education is not completed through schooling process, such s class learning, discussion. observation etc, but in the our practical life itself. This means that environmental education can be done by changing of lifestyle anywhere we live, and anytime. But any places governed our social life are polluted by efficiency pursuiting individualism in market oriented capitalism society. So environmental education can't hold the water in this system, in the aspect that we can't stimulate feelings of the student and general people, getting to public resource value and harmony with nature by throwing individual mind away. It is big problem. In this field, I have thought the unique space and social structure which can be used as environmental education place is small-planning community, such as Kibbutz in Israel, educational community Finhorn in Scotland, harmony community Yamagicism Village in Japan and DURE in Korea etc. For the research of this educational possibility in these small community, I visited and investigated immediately, and confirmed. In this thesis, I insist that the training process and practical life experience in this community themselves are good environmental education. So, in case of YAMAGICISM in Japan and FINDHORN in Scotland, DONGSASUP program in Korea, I introduce these small community environmental- education program.