• Journal of The Korean Association For Science Education
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• v.36 no.5
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• pp.729-737
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• 2016

Natural selection is the core idea of evolution that pre-service biology teachers need to understand to solve diverse biological problem. This study aims to investigate the level of Korean pre-service biology teachers' understanding of natural selection by comparing their knowledge with their Chinese, American, and German biology major undergraduate counterparts. In particular, this study focuses on two conceptual components of natural selection (i.e., ecology and genetics). This study used a total 1226 pre-service biology teachers and biology majors' data. The instrument measuring the understanding of natural selection concepts was Conceptual Inventory of Natural Selection, which consists of ten ecology concept items and ten genetics concept items. The Rasch model analysis, multivariate analysis of variance, and univariate analysis of variance were used for the statistical tests. The result reveals that the level of Korean pre-service biology teachers' understanding of natural selection were similar with Chinese undergraduates' understanding and significantly lower than American and German undergraduates.' In the first year student data, the level of genetics concept of Korean pre-service biology teachers were significantly lower than Chinese and German students. In the fourth year student data, the level of ecology concept of Korean pre-service biology teachers were significantly lower than American and German students. Based on these results, the ecology concept education and balanced natural selection concept education are discussed.

• Water for future
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• v.53 no.6
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• pp.30-40
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• 2020

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.161-162
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• 2008

승객 여정선택형(On-demand Journey) 도시철도 시스템의 특징과 역할에 대하여 기술하고 기존 시스템과 차이점을 비교하여 대중교통 시스템으로서 새로운 서비스 개념의 도시철도시스템을 정의하였다. 아울러 국내외 기술개발 현황과 문제점에 대하여 기술하였다. 또한 미래의 교통수단으로서 전망에 대하여 기후변화 협약 및 지속가능한 교통수단으로서 개발가능성을 토대로 승객 여정선택형(On-demand Journey) 시스템 개념을 설정하였다.

• Bulletin of the Society of Naval Architects of Korea
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• v.30 no.4
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• pp.37-40
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• 1993

본 연구는 2개의 세부 과제로 나누어서 수행되었다. CSDP-초기공정 및 일정계\ulcorner 정보처리 시 스템 개발'17' 세부과제에서는 초기단계의 공정/일정계\ulcorner지원 시스템 개발을 위한 요구사항을 분석하고 개발 개념을 정립하였고, CSDP-탑재일정계\ulcorner지원시스템 개발'6' 세부 과제에서는 탑 재일정계\ulcorner 지원 시스템 개발을 위한 요구 사항을 분석하고 이를 토대로 탑재일정계\ulcorner 지원 시 험용 시스템을 개발하여 그 개념을 검증하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.64-66
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• 2001

비디오 데이터는 미디어의 특성상 시간의 흐름에 따라 객체의 위치가 변하는 움직임 객체(Moving Object)를 가지며, 움직임 객체를 기반으로 비디오 데이트를 색인 및 검색하기 위해서는 적합한 시공간 표현 기법이 요구된다. 따라서 본 논문에서는 비디오 데이터가 지니는 움직임 객체의 움직임 경로(Trajectory)를 효율적으로 모델링하고 사용자에게 빠른 검색 결과를 제공할수 있는 근사 탐색(Approximation Search)이 가능한 새로운 시공간 표현 기법을 제안한다. 이는 사용자가 직접 스케치한 움직임 경로를 토대로 검색을 수행하는 내용 기반 검색과 움직임 객체의 일련의 움직임 경로들과 움직임 경로가 일어나는 위치 정보를 통해 얻어진 개념(의미)을 이용한 개념 기반 검색을 지원한다.

• Korean Journal of Logic
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• v.6 no.2
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• pp.49-67
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• 2003

조합논리는 기본적으로 정해진 해석이 없는 순수한 형태만을 가지고 추상적으로 연산하는 관점에 관한 논리로서, 논리학을 기호학적 관점에서 볼 수 있는 토대를 제공해 준다. 조합논리의 특징은 연산자가 피연산자도 될 수 있다는 사실에 있으며 그래서 동일한 연산자가 그 자신의 피연산자도 될 수 있다. 이 논문에서 우리는 기본연산자들의 직관적 개념과 형식적 개념을 소개하고 연산자 대수에 내해 검토하고 나서 조합논리와 $\lambda$-연산의 번역가능성에 다해 알아보겠다. 조합논리에 유형의 개념을 추가하면 자연언어 분석에서 아주 효율적인데 기본유형인 대상자 명제 이외의 어떤 요소라도 함수자로 나타낼 수 있는데 이들은 조합자의 특수한 경우로서 파생유형들이다.

• Journal of the Korea Society of Computer and Information
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• v.17 no.1
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• pp.19-30
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• 2012

Based on the internet-based infrastructures such as various information devices, social network systems and cloud computing environments, distributed and sharable data are growing explosively. Recently, as a data analysis and mining technique for extracting, analyzing and classifying the inherent and useful knowledge and information, Formal Concept Analysis on binary or many-valued data has been successfully applied in many diverse fields. However, in formal concept analysis, there has been little research conducted on analyzing interval data whose attributes have some interval values. In this paper, we propose a new approach for classification of interval data based on the formal concept analysis. We present the development of a supporting tool(iFCA) that provides the proposed approach for the binarization of interval data table, concept extraction and construction of concept hierarchies. Finally, with some experiments over real-world data sets, we demonstrate that our approach provides some useful and effective ways for analyzing and mining interval data.

• School Mathematics
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• v.8 no.4
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• pp.417-439
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• 2006

Many studies indicate the emerging crisis of education of calculus even though the emphasis of calculus have been widely recognized. In our classrooms, the education of calculus also has been faced with its bounds. Most instructions of calculus is too much emphasis on the algebraic approach, thus students solve mathematical problems without truly understanding the underlying concept. The purpose of this study is to develop mathematization teaching and learning materials and methods in caculus based on the mathematization teaching and learning theories by Freudenthal and the variability principles of conceptual learning by Dienes, In order to this purpose, first, we analyzed the high school mathematics II textbook of 7th curriculum in Korea. Second, we developed mathematization teaching and learning materials and methods in highschool calculus. Consequently, the following conclusions have been drawn: we have reorganized and reconstructed the context problem in calculus based on concepts of tangent line and instantaneous rate of change.

• Journal of the Korean earth science society
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• v.41 no.6
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• pp.684-694
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• 2020

In this study, we developed a rubric for assessing middle school students' conceptual understanding about dew point. For this purpose, we analyzed 9th grade students' responses collected by using a multi-tiers constructed-response item of National Assessment of Educational Achievement (NAEA) and classified the types of the responses according to their characteristics. In addition, we analyzed the distribution of student response types according to mean achievement scores and developed an assessment rubric of conceptual understanding about dew point. The findings are as follows: First, the analysis of student responses to finding dew point in the saturation curve showed that many students had no or lack understanding of the scientific concept of dew point. Second, as a result of analyzing the student response to the water vapor condensation process at dew point, the proportion of scientific conception types was very low, while the proportion of misconception types was relatively high and the types varied as well. Third, a four- level assessment rubric was developed based on the analysis of the distribution of student response types according to the mean achievement scores. Based on the findings, we suggested the development and utilization of assessment rubric in the field of Earth science education.

• Annual Conference of KIPS
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• 2005.11a
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• pp.251-254
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• 2005

계층적 개념구조는 대상 도메인으로부터 지식을 표현하는데 있어서 간결하면서도 효과적으로 개념간의 구조를 설명하기 위해 사용되고, 데이터의 구조화와 요약을 제공하며 필요한 정보의 수월한 접근을 제공하기 위해 널리 적용되고 있다. 그러나, 대상도메인으로부터 계층적 개념구조를 구축하기 위해서는 많은 시간과 노력이 요구된다. 따라서 계층적 개념구조를 효율적으로 구축하기 위한 체계가 필요하다. 본 논문에서는 계층적 개념구조를 체계적으로 구축하기 위한 형식개념분석기법(FCA, Formal Concept Analysis)을 토대로, Many-valued context와 Scaling을 자동화하기 위한 도구로써 본 연구에서 개발된 FCA Wizard를 소개한다.