• 베이커리
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• no.9 s.410
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• pp.160-160
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• 2002

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.22 no.12
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• pp.5-12
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• 2004

• 베이커리
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• no.4 s.369
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• pp.40-55
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• 1999

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.382-384
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• 2002

최근들어 security가 데이터 통신의 중요만 이슈로 떠오르고 여러 기관들의 망에 Firewall을 설치하여 보호하는 것은 점점 더 일반화 되고있다. Sun의 SKIP Firewall Traversal 방법 은 Mobile IP가 Firewall이 설치된 환경에서도 제대로 동작할 수 있도록 고안된 것이다. 그러나 이 방법은 실제 적용에 있어 몇몇 문제점이 발견된다. 본 논문에서는 이 문제점들을 살펴보고 그것을 해 결하는 방안을 제시하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.396-398
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• 2000

최근 무선 통신 기술의 발달과 휴대용 컴퓨터의 소형화, 수요증가에 따라 휴대용 컴퓨터에서의 통신은 차차 우리 생활에 없어서는 안될 요소가 되어가고 있으며 IP 기반에서의 Mobility 제공을 그 목적으로 하는 Mobile IP 기술은 차세대 인터넷망의 핵심기술이 될 전망이다. 이에 본 논문에서 Mobile IP Protocol을 Mobile Node를 중심으로 객체지향 개념을 도입하여 설계, 구현한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.547-549
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• 2001

인터넷의 확산과 All-IP망으로의 망의 진화에 대한 논의가 활발하게 이루어지고 있다. 더불어 IPv6[1]망에서의 이동성 지원을 위하여 IETF(Internet Engineering Task Force)에서 Mobile IPv6를 제안하였다. Mobile IPv6[5]의 기본 발상은 Routing Table의 변경에 의에 다른 링크로 이동한 호스트에게 Packet를 전달할 수 있게 하는 것이다. (Triangle Routing[4]). Mobile IPv6을 구성하는 요소 중 Mobile Node의 기본 구조를 제시했다. Mobile Node 자신의 위치 정보를 갱신하는 Move Detection이 핵심적인 부분이다. 본 논문에서는 이 절차에 대한 보다 실제적인 고찰과 이를 의한 설계를 제시한다.

• Journal of The Korean Association For Science Education
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• v.17 no.3
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• pp.239-249
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• 1997

Primary students' conceptions on the atmospheric pressure and its related concepts were investigated. Samples consisted of 41 5th grade and 43 6th grade primary school students. Two types of research methods were used: 1) the open-ended written questionnare;2) paper-pencil test. Naive theories on the atmospheric pressure and its related concepts were numerous. For example, 80% students thought that as we go higher into the atmosphere, the atmospheric pressure becomes greater. Also, 50% students thought that the hot air had greater the atmospheric pressure than the cold air. This study was also discussed the teaching strategies to overcome these naive theories on the atmospheric pressure and its related concepts.

• Journal of Korean Elementary Science Education
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• v.21 no.1
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• pp.43-59
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• 2002

There has been a long debate whether the Sun revolves the Earth or the Earth revolves the Sun. Also, students are very interested in the solar systems, which means the entire system of planets, satellites, minor planets, comets, and meteoroids that orbit the sun. However, students are not sure about them. New models which enhance teaming about them are strongly needed. This study is intended to develop the new models on the solar systems and to investigate how the preservice elementary teachers' concepts are affected by them. Subjects are 20 preservice elementary teachers, One instrument including 11 items is used. Data are collected before using the new models and after using them through the tests. As a result, learning through the new models has a positive effects on the preservice elementary teachers' concepts on the solar system.

• Journal of Korean Elementary Science Education
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• v.21 no.2
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• pp.253-261
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• 2002

This study is intended to develop the role plays on the moon's movement and to investigate how the preservice elementary teacher's concepts are affected by them. Subjects are 30 preservice elementary teachers. One instrument including 7 items was used for testing the preservice teachers' concepts on the moon's movement. Data were collected before using the role playing and after using them through the tests. As a result, the preservice elementary teachers' concepts on the moon's movement were improved by teaming through the role playing

• Journal of Korean Elementary Science Education
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• v.27 no.4
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• pp.399-419
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• 2008

The purpose of this study was to develop performance assessment materials of scientific inquiry skills on 62 scientific activities in elementary science textbook for third and fourth grades. For this study, a total of 318 elementary teachers were sampled and surveys were carried out to examine the status of performance assessment of scientific inquiry skills in school. The classification system of assessment methods by Hart(1994) was also analyzed to create assessment strategy of scientific inquiry skills for elementary school students. Based on the quantitative data analysis, literature study and existing performance assessment materials analysis, performance assessment materials were developed and applied to science classes for third and fourth grades. Teachers and students were interviewed after the classes for asking about merits and improvements and the performance assessment materials were revised.