• Review of KIISC
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• v.17 no.5
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• pp.50-56
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• 2007

X.tsm은 템플릿 관리 위치와 바이오인식 인증 위치에 따라 9개의 모델을 제시한 바이오 인증 프로토콜로, 2006년 12월 제네바 ITU-T SG17 Q.8 회의에서 First of Recomanda-tion 단계로 채택된 표준이다. 바이오인식 제품 응용 인터페이스(BioAPI)에 입각하여 6개의 모델을 제시한 BIP(BioAPI Interworking Protocol)은 2007년 1월 뉴질랜드 ISO/IEC JTC1 SC37 WG2 회의에서 FCD로 제정된 국제표준이다. X.tsm과 BIP간의 중복성 문제가 제기됨에 따라 ITU-T SG17 Q8(Telebiometrics)에서 2006년 4월 제주에서 두 표준과제의 공통사항을 반영한 X.bip가 채택되어 표준화가 진행되고 있다. 이 논문에서는 바이오 주요 컴포넌트의 개념을 명확하고, 모델 간 중복성을 제거하기 위해 13개의 새로운 모델을 제안한다. 두 표준에서 새로운 모델을 공통적으로 수용하게 되면, 표준안을 준용하는 사용자 입장에서 구현을 용이하게 할 수 있다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.605-608
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• 2010

효율적인 국토관리 및 국가산업 육성, 이를 통한 대시민 서비스를 강화하고자 U-City 구현이 활발히 진행되고 있다. 국내의 경우 U-City 구현을 위한 인프라 및 요소기술들에 대한 연구가 활발히 진행되고 있으나 서비스, 공간 등에 대한 연구와 상호 호환 및 연동에 대한 기반 연구가 부족한 실정이다. 또한 도시민의 수요와 요구를 제대로 반영하지 못하는 서비스 제공과 개념적으로 동일하거나 유사한 서비스가 중복 개발되는 문제가 발생하고 있다. 이러한 U-서비스의 과다한 중복생산을 지양하고, U-City에 거주하는 도시민들이 체감할 수 있는 시민친화적 서비스를 도출을 위한 연구의 필요성이 제기되고 있다. 본 논문에서는 도시민의 요구를 반영한 수요자 중심의 서비스 항목을 도출하였고, 서비스 제공의 우선순위를 제안하였다. 따라서 U-서비스 도입시의 파급효과를 극대화하고 결과의 타당성 한계를 극복하고자 한다.

• Journal of KIISE:Software and Applications
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• v.27 no.11
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• pp.1106-1114
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• 2000

컴퓨터 분야에서 에이전트의 개념은 전자 상거래, 정보 검색과 같은 많은 어플리케이션들에 응용되어 중요 시 되고 있다. 하지만, 아직까지 지능성을 가진 테스트 도구는 없었다. 이 논문에서 제안하는 테스트 에이전트 시스템은 에이전트의 특성을 가지고 테스터를 도와주는 테스트 도구이다. 테스트 에이전트 시스템은 객체지향 테스트 프로세스를 따라 테스터의 일을 대행해 주고, 테스터의 간섭을 최소화 시켜 준다. 이 시스템은 자동 생성된 많은 양의 테스트케이스에서 중복이 없고 일관성 있는 테스트케이스를 지능적으로 선택하여 테스트 시간을 단축시켜 준다. 테스트 에이전트 시스템은 3개의 에이전트 User Interface Agent, Test Case Selection & Testing Agent, Regression Test Agent로 구성된다. 특히 Test Case Selection & Testing Agent은 RE-Rule과 CTS-Rule을 통하여 중복이 없고 일관성 있는 테스트케이스를 지능적으로 선택하며, Regression Test Agent는 RRTIS-Rule을 통해 리그래션 테스트 항목을 지능적으로 선택한다.

• Journal of Korean Elementary Science Education
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• v.31 no.1
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• pp.84-98
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• 2012

이 연구는 전하 이동을 강조한 튜토리얼을 통하여 초등 교사의 전기 개념 변화를 분석하고, 초등 교사 교육을 위한 시사점을 얻는데 있다. 튜토리얼은 사전검사, 워크시트, 사후검사로 구성되었고, 내용은 두 개의 대범주인 정전기 영역과 전류 영역으로 이루어졌다. 현직 초등 교사 68명에게 튜토리얼을 적용하고 선택형 질문지, 사전 검사, 사후 검사, 워크 시트, 튜토리얼 과정 녹화 전사본 및 면담을 통하여 초등 교사의 전기 개념 변화를 분석하였다. 연구 결과, 교사들은 도체와 부도체의 전기적 특성에 대해 이해하게 되었는데, 마찰과 유도, 접촉에서 전하들의 움직임을 고려하고 설명할 수 있게 되었다. 그러므로 대전과 전류를 혼동하는 어려움이 해소되었다. 열린 회로에서는 전압을 전하가 받는 힘을 고려하여 이해할 수 있게 되었고, 축전기를 통해 일시적 전하의 이동을 설명할 수 있었다. 이것은 전압이 전류의 결과라는 오개념을 과학적 개념으로 바꾸는데 중요한 역할을 하였다. 닫힌 회로에서는 전구 양단에 쌓이는 전하들의 분포를 강조함으로써 회로에서 전류가 소모되지 않고 일정함을 이해하게 되었고, 직렬과 병렬에서도 각 회로에서 전구 양단의 전하들의 분포를 고려함으로써 회로에 따라 전지의 역할이 달라짐을 이해할 수 있게 되었다.

• KIPS Transactions on Computer and Communication Systems
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• v.11 no.9
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• pp.305-316
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• 2022

With the flood of digital data owing to the Internet of Things and big data, cloud service providers that process and store vast amount of data from multiple users can apply duplicate data elimination technique for efficient data management. The user experience can be improved as the notion of edge computing paradigm is introduced as an extension of the cloud computing to improve problems such as network congestion to a central cloud server and reduced computational efficiency. However, the addition of a new edge device that is not entirely reliable in the edge computing may cause increase in the computational complexity for additional cryptographic operations to preserve data privacy in duplicate identification and elimination process. In this paper, we propose an efficiency-improved duplicate data elimination protocol while preserving data privacy with an optimized user-edge-cloud communication framework by utilizing a trusted execution environment. Direct sharing of secret information between the user and the central cloud server can minimize the computational complexity in edge devices and enables the use of efficient encryption algorithms at the side of cloud service providers. Users also improve the user experience by offloading data to edge devices, enabling duplicate elimination and independent activity. Through experiments, efficiency of the proposed scheme has been analyzed such as up to 78x improvements in computation during data outsourcing process compared to the previous study which does not exploit trusted execution environment in edge computing architecture.

• Journal of Science Education
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• v.37 no.1
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• pp.186-202
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• 2013

The purpose of this study is to develop and apply materials to teach about reflection of light by peer instruction. These which consist of both hands-on experiments and ConcepTests based on students' preconceptions found in previous researches are inducing active interaction between peers during instruction. Data from 29 university students were rate of correct answer of pre and post tests, results of conceptests before and after peer discussion, homework for strengthening their conceptual changes, and RTOP result for analysis of learners' perception about this method. Learners' preconceptions on reflection of light and position of image are changed effectively into scientific concepts. And they evaluate this teaching method helps conceptual understanding and interaction of an instructor and learners.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.4B
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• pp.311-322
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• 2006

Peer-to-peer (P2P) systems have become a popular medium through which to share huge amounts of data. On the basis of network topology, P2P systems are divided into three types: centralized, structured distribution, unstructured distribution. Unstructured P2P systems such as Gnutella are novel in the sense that they are extensible and reliable. However, as the number of nodes increases, unstructured P2P systems would suffer from the high complexity of search operations that have to scan the network to find the required data items. Efficient replication of data items can reduce the complexity, but it introduces another problem of maintaining consistency among replicated data items when each data item could be updated. In this paper, we propose a new update propagation algorithm that propagates an updated data item to all of its replica. The proposed algorithm can reduce the message transfer overhead by adopting the notion of timestamp and hybrid push/pull messaging.

• Journal of Internet Computing and Services
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• v.21 no.6
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• pp.13-21
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• 2020

The Android author identification study can be interpreted as a method for revealing the source in a narrow range, but if viewed in a wide range, it can be interpreted as a study to gain insight to identify similar works through known works. The problem found in the Android author identification study is that it is an important code on the Android system, but it is difficult to find the important feature of the author due to the meaningless codes. Due to this, legitimate codes or behaviors were also incorrectly defined as malicious codes. To solve this, we introduced the concept of survival network to solve the problem by removing the features found in various Android apps and surviving unique features defined by authors. We conducted an experiment comparing the proposed framework with a previous study. From the results of experiments on 440 authors' identified apps, we obtained a classification accuracy of up to 92.10%, and showed a difference of up to 3.47% from the previous study. It used a small amount of learning data, but because it used unique features without duplicate features for each author, it was considered that there was a difference from previous studies. In addition, even in comparative experiments with previous studies according to the feature definition method, the same accuracy can be shown with a small number of features, and this can be seen that continuously overlapping meaningless features can be managed through the concept of a survival network.

• The Transactions of the Korea Information Processing Society
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• v.6 no.8
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• pp.2113-2123
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• 1999

The partial free order feature of Korean makes grammar size represented by CFG too big and that's why grammar has to contain all the ordered words. There are some problems to parse spoken language, because spontaneous spoken language has special features such as meaningless words, repetitious speech, etc. So, in this paper, we define 'Core-Concept' as the necessary element for parsing and we describe grammar only using Core-Concept. And we can prevent grammar from becoming very large and reduce an additional parsing burden as we select. Core-Concept described in grammar as parsing element. Through this strategy, we present that the simplified grammar can give us more efficient method to get right results. Experiments show that our parsing strategy has an average of 98% or over success rate in correct parsing results.

• Journal of Gifted/Talented Education
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• v.22 no.3
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• pp.703-728
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• 2012

The purpose of this study was exploring instructive methods to make each gifted child's ability develop as more by selecting the dynamic method instead of existing static method in teaching and evaluating science-gifted students in elementary school and by analyzing conceptual change of electric circuit. In this research, 11 science-gifted students in primary school were chosen, and Dynamic Science Assessment(DSA) intended to comprehension of scientific electric circuit concept was performed as focusing on scaffolding aspects in order to find the transition process. And then, the features on transition process of students' concept were analyzed in quality. The results of the study were checked that the features of useful scaffolding input with respect to comprehending concepts of science gifted-students by using DSA. The less familiar to approach the subjects, the more presented numbers of scaffolding showed. As coming toward transition and same questions, scaffoldings (interactions) were declined because their level of transition was higher than before. Various ways were used in helping the students comprehend the concept on the method of connecting electric circuit and the emitting amount of current, which acted to adapt to daily life.