• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.220-222
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• 2004

다양하고 많은 양의 정보가 존재하는 웹 환경에서 웹사이트를 방문하는 사용자의 접근패턴도 매우 다양하며, 웹 환경의 변화에 따라서 이러한 접근패턴은 계속 변화한다. 이러한 이유로, 웹사이트 개발자가 사전에 사용자의 욕구에 완벽하게 부합하는 완벽한 사이트를 개발하기란 사실상 불가능하다. 이에 대한 해결방안으로, 웹사이트에 대한 사용자 접근 패턴을 학습친서 웹사이트의 구조나 외형을 자동적으로 개선시켜 나가는 적응형 웹사이트 (Adaptive Web site)가 제시되었다. 본, 논문에서는 DTMC(descrete-time Markov chain)렌 의거한 확률적 모델을 이용하여 적응형 웹사이트 구축에 필요한 사용자 접근패턴을 학습하고 이를 적용하기 위한 효과적인 방법론을 제시한다.

• Journal of the Korean School Mathematics Society
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• v.8 no.2
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• pp.183-201
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• 2005

Illustrations and letters are two components of school textbooks. In the case of low grades of elementary school, textbook's illustrations play an important role in learning because many parts of curriculums(lessons) are represented by the visual forms through illustrations. So elementary mathematics textbook's illustrations have to make clear mathematical concepts and principles by visual simplification and bring out of the interest and motivation of elementary school students' learning. In this paper, we analysed the external and content aspects of textbook's illustrations, focusing on the textbook of the second grade. We investigated number, kindness, size, ratio, and clearness of illustrations in regard to external aspects. On the aspects of content, we analysed the role of illustrations and the degree of agreement with contents. Also we classified types of error in the textbook's illustrations and presented examples of errors which was found.

• Journal of the Korea Society of Computer and Information
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• v.26 no.11
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• pp.85-92
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• 2021

In this paper, a method for effectively detecting rotated face and rotation angle regardless of the rotation angle is proposed. Rotated face detection is a challenging task, due to the large variation in facial appearance. In the proposed polar coordinate transformation, the spatial information of the facial components is maintained regardless of the rotation angle, so there is no variation in facial appearance due to rotation. Accordingly, features such as HOG, which are used for frontal face detection without rotation but have rotation-sensitive characteristics, can be effectively used in detecting rotated face. Only the training data in the frontal face is needed. The HOG feature obtained from the polar coordinate transformed images is learned using SVM and rotated faces are detected. Experiments on 3600 rotated face images show a rotation angle detection rate of 97.94%. Furthermore, the positions and rotation angles of the rotated faces are accurately detected from images with a background including multiple rotated faces.

• Journal of the Korean earth science society
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• v.42 no.1
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• pp.88-101
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• 2021

The purpose of this study was to qualitatively examine the meaning of students' drawings in outdoor classes and modeling-based learning cycles. Ten students were observed in a gifted education center in Seoul. Under the theme of the Hantan River, three outdoor classes and three modeling activities were conducted. Data were collected to document all student activities during field trips and classroom modeling activities using simultaneous video and audio recording and observation notes made by the researcher and students. Please note it is unclear what this citation refers to. If it is the previous sentence it should be placed within that sentence's punctuation. Hatisaru (2020) Ddrawing typess were classified by modifying the representations in a learning context in geological field trips. We used deductive content analysis to describe the drawing characteristics, including students writing. The results suggest that students have symbolic images that consist of geologic concepts, visual images that describe topographical features, and affective images that express students' emotion domains. The characteristics were classified into explanation, generality, elaboration, evidence, coherence, and state-of-mind. The characteristics and drawing types are consecutive in the modeling-based learning cycle and reflect the students' positive attitude and cognitive scientific domain. Drawing is a useful tool for reflecting students' thoughts and opinions in both outdoor class and classroom modeling activities. This study provides implications for emphasizing the importance of drawing activities.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.47-50
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• 2023

본 논문에서는 딥러닝 CNN 알고리즘을 이용하여 사람의 얼굴 이미지를 학습한 다음 나이와 성별을 예측하는 시스템을 제안한다. 이 시스템은 개개인 마다 각기 다른 외형적 특성을 고려하여 이를 분석한 다음 이에 맞는 헤어 스타일, 옷차림을 추천할 수 있다. 해당 기술을 활용하여 메타버스 아바타 생성에 사용자의 얼굴과 같은 신체적 특성을 고려할 수 있다. 향후에는 신체 전체를 이미지화하여 보다 더 다양한 정보를 인식할 수 있도록 연구를 진행할 것이다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.1
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• pp.1-11
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• 2014

In this paper we propose a system for vehicle detection and tracking which has the ability to learn on-line appearance changes of vehicles being tracked. The proposed system uses feature-based tracking method to estimate rapidly and robustly the motion of the newly detected vehicles between consecutive frames. Simultaneously, the system trains an online vehicle detector for the tracked vehicles. If the tracker fails, it is re-initialized by the detection of the online vehicle detector. An improved vehicle appearance model update rule is presented to increase a tracking performance and a speed of the proposed system. Performance of the proposed system is evaluated on the dataset acquired on various driving environment. In particular, the experimental results proved that the performance of the vehicle tracking is significantly improved under bad conditions such as entering a tunnel and passing rain.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.461-468
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• 2016

Illustration, which is shown in the textbook for educational purpose is used to explain basic educational theory, rather than carrying meaning itself. It has proper educational value when presented appropriately according to the process of knowledge acquirement. This research organized new analyzing criterion for the frame and content analysis subjected on 4 sanitation textbooks of middle school, moreover looked into actual situation by convergent analysis. This is for political suggestion that is helpful to further textbook development; by understanding improvement point required in reaching educational purpose presented in health education course manual. Results are as following. First, in the aspect of frame, diagrams with proper function to explain principle of health and sanitary activities should be more frequently suggested. Second in the aspect of content, illustrations for simple data providing or for decoration should be reduced while illustrations suggesting experimental results should be added, to reorganize health textbook according to the purpose of health education course.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.835-837
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• 2005

최근 얼굴 인식은 사용자의 편의성을 포함한 다양한 장점으로 인하여 생체 인식 시장에서 주요 기술로 대두되고 있다. 그러나 조명 변화에 기인한 얼굴 인식 성능의 저하는 실용화에 걸림돌이 되고 있는 실정이다. 따라서 조명 변화에 따른 얼굴의 외형 변화를 분석하는 연구들이 세계적으로 활발히 진행되고 있다. 그러나 기존 방법들은 다수의 등록 영상이나 조명에 대한 사전 정보가 필요하거나 실시간으로 구현되기 어렵기 때문에 실용 시스템에 적용하기는 어려운 실정이다. 따라서, 본 논문에서는, 여러 조명 영상들로 구성된 학습 데이터를 이용하여, 조명에 대한 정보가 없는 한 장의 입력 영상을 분석하는 방법을 제안한다. 제안된 방법은 SVDD를 이용하여 학습 데이터의 여러 조면 영상들로부터 입력 영상의 조명과 같은 대표영상을 합성하고 이 대표영상들의 선형 조합을 이용하여 입력 영상을 표현한다. 제안 방법의 효율성을 검증하기 위하여 공인 얼굴 데이터베이스들을 이용하여, 기존 방법들과 비교 실험을 수행하였으며, 조명 변화가 큰 영상에서도 안정된 조명 변화의 분석이 가능하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.35-38
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• 2014

디지털 문화재 콘텐츠는 현실에서 체험하기 힘든 문화재를 디지털 기술의 특성을 이용하여 사용자의 경험을 극대화할 수 있고, 문화재 보수, 교육 등에 활용될 수 있다. 그런데 기존의 디지털 건축물 문화재는 실재 문화재의 구조 및 구성을 무시하고 외형만 만들어져 있어서 다양한 형태로 바꾸어 활용하기 곤란하며, 디지털 건축물 문화재 자체가 가상공간에 존재하여 현실체험에 제한을 받고 있다. 본 논문은 사용자가 현실공간에서 부재 미니어처를 이용하여 미니어처 문화재를 조립하고 그 결과를 가상공간의 디지털 문화재로 연결하여 다양한 체험을 제공하는 시스템에 관한 것이다. 이로서 현실 체험과 가상 체험이 연결되어, 보다 효과적인 체험이 가능하고 건축 문화재에 대한 보다 전문적인 학습이 가능하게 된다.

• Journal of Elementary Mathematics Education in Korea
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• v.21 no.3
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• pp.485-503
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• 2017

'Saembon' was elementary mathematics textbook in the Period of Syllabus in Korea. First I classified Saembons in five groups. And then I regrouped them into two kinds. One kinds were published under U.S. Army Military Government, and other kinds were made under Republic of Koera. Two kinds of Saembon were very different in several aspects. I showed how they were different through real examples. Finally I tried to explain that Saembons under Republic of Koera were better than Saembons under U.S. Army Military Government.