• Journal of the Korean Chemical Society
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• v.43 no.6
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• pp.707-719
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• 1999

This article studies the understanding of acid and base concepts of the 3rd-grade students in middle school. An effective teaching strategy for improving their acid and base concepts was designed by considering students' prior knowledge using Lawson's learning cycle method. The control group was adapted by the traditional teaching strategy which isn't considering students' prior knowledge. After the class, understanding of acid and base concepts of treatment group was significantly higher than that of control group. But the level of students' understanding of strong acid, weak acid strong base and the strength of acid in aqueous solution was low even after the class of two groups. This indicates indirectly that the microscopic views of acid and base concepts in aqueous solution are not easy to learn for these students. For the four categories of acid and base concepts, students' responses were reviewed carefully and classified into scientific conceptions and misconceptions. These results will be useful for developing an effective teaching strategy of acid and base concepts.

• Journal of The Korean Association For Science Education
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• v.28 no.5
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• pp.424-437
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• 2008

In this study, we collected teachers' opinions with regard to the effects of the instruction using analogy generation, the disadvantages of the instruction, the problem-solving methods of the instruction, and the teacher's role in it, and accordingly tried to investigate its effectiveness with the analysis of students' academic achievements and motivation, and through the student's interview, after applying the activities of creating generated analogies, finding the difference between the objects and comparisons, and presenting new-known genetics concepts as the students themselves generated analogies. As a result of a teachers' workshop on instruction using analogy development, it was expected to have a positive effect on students' understanding of scientific concepts in genetics, which were found to be difficult for students to understand in learning biology. Students found analogy examples for concepts in genetics in daily life, compared their analogs to those of peers, and examined inconsistencies between targets and analogs through the process of discussion, which finally led to their correct perception of scientific concepts in genetics. In addition, instruction using student-generated analogies proved to have a more positive effect on improving academic achievement and motivating learning, compared with traditional expository instruction.

• 한국IT서비스학회:학술대회논문집
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• 2002.06a
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• pp.63-69
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• 2002

최근의 정보시스템 업체들은 e비즈니스 분야의 IT프로젝트로 특수를 누리고 있다. 이런 새로운 분야의 IT프로젝트는 급변하는 기술의 추세와 연봉제로 활성화된 인력의 이동이라는 어려운 관리적 요인들을 접하고 있다. 즉, 단지 재무적 관점뿐만 아니라 시간적, 자원적, 품질적, 그리고 새로운 환경에 적웅해야하는 위험적 요인등 그 관리요소가 증가하고 있다. 그래서 프로젝트조직이나 관련기업의 경우 eIT분야의 프로젝트를 관리하기 위한 새로운 개념이나 방법론의 개발이 요구되고 있는 실정이다. 이에 본 논문에서는 최근의 정보시스템 업체들이 직면하고 있는 프로젝트관리의 어려운 점을 살펴보고, e비즈니스 환경의 정보기술프로젝트의 환경적 특성을 고려한 프로젝트 관리의 새로운 접근법을 엔트로피 이론에 기반 하여 설명하였다. 그리고 마지막으로 사례에 근거한 예제를 제시하여 엔트로피에 의한 프로젝트관리의 적용가능성을 제시하였다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2000.11a
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• pp.285-296
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• 2000

오늘날 시스템의 개발 및 유지보수는 점점 더 어려운 문제가 되고 있다. 시스템은 갈수록 거대하고 복잡ㆍ다양해져 가는데 반해 시스템 기능에 대한 사용자들의 요구사항은 끊임없이 증가하여 수시로 수정ㆍ보완 및 확장을 요구하고 있다. 특히 웹의 등장과 그 활용의 증가로 웹 환경에 적합한 시스템개발은 더욱 어려운 문제가 되고 있다. 급변하는 환경 속에서 융통성(flexibility) 및 재사용(reuse)을 기반으로 한 객체지향 기술은 이러한 시스템개발의 문제들을 해결해 주는 대안으로 주목받고 있으며, 분석 및 설계과정에서 시스템개발의 산출물들을 명세화, 시각화, 문서화하는 모델링 언어로서 UML(Unified Modeling Language)이 1997년에 OMG의 표준으로 받아들여지면서 그 활용도가 점점 증가하고 있다.(중략)

• Proceedings of the Korean Society for Information Management Conference
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• 2013.08a
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• pp.163-166
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• 2013

본 연구는 공공도서관 이용자들을 대상으로 실제 도서관 이용과 관련한 구전행위가 어떤 내용으로 어떻게 이루어지고 있는지 대해 알아보고자 하였다. 이를 위해 서울 소재 공공도서관 한 곳을 주 1회 이상 정기적으로 이용하는 20-40대 이용자들을 대상으로 심층 면접을 통해 자료를 수집하고, 근거 이론 방법을 적용해 데이터를 분석하였다. 그 결과, 총 130개 개념과 58개의 하위범주, 그리고 17개의 범주가 도출되었고, 도서관 서비스 이용에서 구전으로 이어지는 일련의 과정은 '도서관 인지-도서관 서비스 이용 및 경험-도서관에 대한 구전 행위-구전 행위에 따른 결과'의 네 단계로 정리해 볼 수 있었다. 본 연구에서 도출된 핵심범주는 '나에게는 가깝지만 같이 소통하기에는 어려운 도서관'으로써, 평소 도서관과 관련된 것들에 관심이 많은 이용자들에게는 도서관이 가깝고 친근한 시설이지만 대다수의 일반인들에게는 구전을 통한 소통과 이해가 어려운 장소로 인식되는 것으로 나타났다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.3
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• pp.13-22
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• 2001

The notion of pseudorandomness plays an important role in modem cryptography as well as computer science. We show a simple and practical construction of a pseudorandom generator based on the intractability of the problem in braid groups. The generator is proved as secure as a hard instance of a variant of the conjugacy problem.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.1
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• pp.157-163
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• 2015

XML has become one of the most influential standard language for representing and exchanging data on internet. However, XML itself has a ability to represent a logical structure for storing and managing data, it is inadequate to use as a conceptual modeling tool because of its complexity for representing the document structures. In this paper, we propose the graphical form of conceptual modeling techniques for representing the structure of the XML schema documents using an extended entity relationship diagram. For this, extended entity relationship model is presented for representing the XML schema structure, transformation rules are presented for transforming extended entity relationship model into XML schema document to show the completeness of the proposed model.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.6
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• pp.211-216
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• 2017

XML is becoming a de facto standard for the representation and exchange of data, and XML itself is well structured to store and manage data, but it is difficult to understand the document structure at a glance due to its diverse and complex expressions. Thus, it is not appropriate to use it as a tool of conceptual model. In this paper, we propose a method to transform XML schema document structure into conceptual model. To do this, we describe CMXML as a conceptual modeling tool and present transformation rules and data structures for transforming an XML schema structure into CMXML diagram. In the transformation procedure, the XML schema document is input and the CMXML diagram is generated by applying the transformation rules.

• 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.

• Communications of Mathematical Education
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• v.24 no.3
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• pp.709-730
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• 2010

The inverse function of a one-to-one correspondence is explained with a graph, a numerical formula or other useful expressions. The purpose of this paper is to know how low achieving students understand the learning contents needed reversible thinking about irrational functions. Low achieving students in this study took paper-pencil test and their written answers were collected. They made various mistakes in solving problems. Their error types were grouped into several classes and identified in this analysis. Most students did not connected concepts that they learned in the lower achieving students to think in reverse order in case of and to visualize concepts of functions. This paper implies that it is very important to take into account students' accommodation and reversible thinking activity.