• Journal of the Korea Society of Computer and Information
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• v.17 no.3
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• pp.121-133
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• 2012

In this paper, we propose a novel data analysis approach that extracts granules suitable for various perspectives by introducing scaling level into formal concept analysis in order to control the level of granularity. Based on our approach, we can extract various granules from the given data set and constructs granular concept hierarchies based on the relations between the granules. Therefore, we can classify the given data with respect to the purpose or the intention of user's viewpoints. And, we developed G-Tool that supports our approach. In order to verify the usefulness of our proposed approach and G-Tool, we have done some experiments for real data set and reported about results of our experiments. From the experiments' results, we can verify our approach with G-Tool can be useful and suitable for classifying the given data with various scaling levels. The traditional formal concept analysis cannot control the level of granularity and can only classify for a particular perspective. However, our proposed approach can classify the given data with respect to user's purpose or intention by combining of diverse scale information and scaling levels.

• Journal of Korean Philosophical Society
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• no.87
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• pp.259-311
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• 2009

In this paper, I will critically assess E. Wilson's concept of consilience and thereby try to show the proper way that the humanities and the natural sciences could meet each other and carry out various kinds of interdisciplinary research. In section 1, I will delineate Wilson's concept of consilience. It is the core of his project of consilience to unify the humanities and the natural sciences through the natural scientific methods and therefore he claims that it is in principle possible to carry out the project of consilience. In section 2, I will examine the basic structure of knowledge in the humanities and show that, in principle, the project of consilience cannot be carried out. In section 3, I will show the difficulties that Wilson's projectof consilience has with respect to carrying out the interdisciplinary research between the humanities and the natural sciences. In section 4, I will deal with the various types and ways of properly carrying out the interdisciplinary research between the humanities and the natural sciences. In section 5, I will show that Wilson's concept of consilience has some more difficulties that are not to be discussed in detail in this paper. We also need to critically assess them in order to prepare a more solid ground for the interdisciplinary research between the humanities and the natural sciences.

• Journal of Korean Society of Transportation
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• v.28 no.4
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• pp.41-59
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• 2010

In this study, the indicators for evaluating the level of green growth in transportation are proposed. The authors reviewed the existing philosophies such as sustainable development and eco-efficiency and explained the differences between the philosophies and green growth. The planning hierarchy and indicator framework are proposed and the idea of indicators is also introduced. In order to decide the weighting value for objectives and targets, a questionnaire survey for transportation experts was conducted. The survey results show that low-carbon/environmentally-friendly development is the most important objective. In addition, the results reveal that transportation experts do not fully understand the concept of green growth and cannot differentiate the concept of green growth from that of sustainable development and eco-efficiency.

• Journal of Korean Tunnelling and Underground Space Association
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• v.6 no.2
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• pp.129-139
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• 2004

The several assumptions and design parameters to determine the ventilation rate in tunnel ventilation system were examined. In longitudinal ventilating tunnel, the ventilation rate has been determined by the critical velocity above which the smoke propagation to the upstream of ventilating air is prevented. Based upon the examination of assumptions and experimental results, we suggested the improved method to determine the critical velocity. In transverse ventilating tunnel, we found that the ventilation rate has been determined in accordance with the custom rather than fire-smoke dynamics such as the critical velocity in the longitudinal ventilating tunnel. It is because the ventilation rate in the transverse ventilation system has been determined by considering only the ventilation of contaminant by vehicle. To improve the ventilation design parameters based upon the fire-smoke dynamics, we conducted model tunnel fire experiments. From the experimental results, smoke propagating distance and smoke filling were suggested as the design parameter to determine the ventilation rate in transverse ventilating tunnel. And tunnels in Europe designed by the custom is found to have the dangerous nature in view of fire safety.

• Journal of The Korean Association For Science Education
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• v.33 no.6
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• pp.1219-1236
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• 2013

The purpose of this study was to investigate the association between subject matter knowledge (SMK) and pedagogical content knowledge (PCK) for science teachers. To this end, a total of 26 secondary Earth science teachers participated in this study and a concept diagnostic questionnaire and a lesson planning task of atmospheric pressure were devised to give an indication of participating teachers' SMK and PCK, respectively. The results of this study are summarized as follows: First, participating teachers showed a variety of SMK levels about atmospheric pressure. Second, teachers at high level of SMK focused on 'supplementary' and 'fundamental' curriculum contents for in-depth conceptual understanding, but teachers at low level of SMK, on the contrary, stressed 'applicative' curriculum contents. Third, teachers at high level of SMK grasped students' misconceptions and difficulties in learning atmospheric pressure far more concretely than teachers at low level of SMK. Lastly, teachers at high level of SMK showed a tendency to use learner-centered instructional strategy by utilizing students' prior knowledge, but teachers at low level of SMK were inclined toward teacher-directed concept explanation. Based on this study, some implications for effective science teacher preparation programs were also discussed.

• Journal of the Korean Society for Library and Information Science
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• v.38 no.1
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• pp.13-34
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• 2004

The Reference Model for an Open Archival Information system(OAIS) was recommended for developing digital archives effectively and for implementing interoperability and resource sharing between digital archives. But as the Reference Model is high-level recommendation, it does not specify a design and an implementation. Therefore, this study investigates the architecture of several digital archives, suggestes three strategies for persistent archive, and proposes the conceptual model for developing trusted, persistent, and secure digital archive.

• Journal of The Korean Association For Science Education
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• v.24 no.3
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• pp.668-674
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• 2004

This study investigated Korean fifteen-year-olds' (mis)conceptions on the greenhouse effect based on the PISA results. Based on previous studies on students' ideas about the greenhouse effect, Korean students'understanding of the natural factors and human-induced factors of the greenhouse effect were analyzed. Students' misconceptions about causes of the greenhouse effect were also examined. In addition to CO2, Students mentioned CFCs, atmospheric pollution, water vapor and methane as greenhouse gases. Many students indicated that the greenhouse effect and ozone depletion have a causal relationship. Teaching implications of the misconceptions were also discussed.

• Journal of the Korean School Mathematics Society
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• v.7 no.2
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• pp.99-116
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• 2004

This study investigates the concept of irrational number which middle school students begin to learn for the first time in their learning mathematics. Further, this explores how that concept is being taught, how much students understand that concept and things that students have difficulty in understanding relating to the concept of irrational number. Thus we try to figure out how the concept of irrational number should be taught for the most effective students' understanding. Thus, we want to provide some suggestions for teaching and learning irrationals numbers.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10b
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• pp.71-76
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• 2006

핸드폰, 스마트폰, PDA와 같은 모바일 디바이스는 위치, 전화기록, SMS, 사진, 동영상 등 사용자에 관한 다양한 정보를 지속적으로 수집하는데 유용하다. 최근, 모바일 디바이스로부터 수집된 정보를 토대로 개인의 일상을 요약하거나 상위 수준의 행동을 추론하는 등의 서비스를 제공하려는 연구가 진행되고 있다. 본 논문에서는 모바일 디바이스에서 수집된 정보를 검색, 요약, 시각화하기 위한 플랫폼인 라이프 브라우저를 제안한다. 라이프 브라우저는 디바이스에 저장된 개인 정보를 효과적으로 검색할 수 있도록 해주고, 개념 네트워크를 활용하여 개념 검색을 지원하며, 키그래프 기반 정보 요약 기능을 제공한다. 위치 정보의 레이블링을 위해 블록 기반의 Location Positioning Server가 구축되었다. 실제 3명의 사용자를 대상으로 수집한 정보를 라이프 브라우저를 통해 회상해 보는 과정을 분석해 보았고 저수준의 로그 정보를 직접 다루는 것보다 개념 네트워크 기반 라이프 브라우저를 사용하는 것이 유용함을 확인할 수 있었다.

• Journal of Elementary Mathematics Education in Korea
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• v.22 no.4
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• pp.453-473
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• 2018

In this study, we analyzed the contents of speed concept presented in Korean, Japanese, Singapore, and American elementary mathematics textbooks, and drew implications for the teaching of speed concept in elementary schools. We developed a textbook analysis framework by theoretical discussions on the characteristics of the speed concept based on the proportional relationship and the previous researches on the speed in elementary mathematics. We analyzed the textbooks of four countries and drew some suggestions for improving the teaching of speed concept in Korean elementary schools.