• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.697-700
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• 2000

워터마크의 실현방법은 크게 두 가지로 나누어지는데, 하나는 공간영역에서 처리방법이고 다른 하나는 주파수영역에서 처리방법이다. 초기에는 공간영역에서 처리가 많이 연구되었으나 공간영역에서의 워터마크 삽입방법은 주로 least significant bit(LSB)을 조작하기 때문에 주파수영역의 방법보다 각종 신호처리에 의해 워터마크가 쉽게 없어지는 단점이 생긴다. 따라서 현재는 그런 단점들을 잘 극복할 수 있는 방법으로 주파수 영역에서의 워터마크 삽입 방법이 많이 쓰인다. 본 논문에서는 디지털 영상을 위한 다해상도 이산 웨이브렛 변환을 사용한 워터마킹 방법을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.607-610
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• 2024

기업의 운영에 있어서 기업의 핵심 정보가 유출되지 않도록 관리하는 것은 매우 중요하다. 따라서, 사내에서 유통되는 문서들에 대해 핵심적인 정보가 사외로 유출되지 않도록 관리하고 추적하는 것은 필수적이다. 특히, 데이터가 구조화되지 않고, 다양한 형식으로 구성되어있는 비정형 문서 내에서 핵심 정보를 식별하는 것은 기술적으로 어려움이 존재한다. 본 논문에서는 YOLOv8을 사용하여 비정형 문서 내에서 영역을 식별하고, 자연어 처리 모델인 Word2Vec을 사용하여 비정형 문서 내에서 핵심 내용을 식별한 후 이를 시각화함으로써 사내에서 유통되는 비정형 문서 내의 핵심 정보를 식별하고 추적하는 방법을 제안하였다.

• Journal of Korean Library and Information Science Society
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• v.51 no.1
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• pp.179-200
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• 2020

This study aims to detect the knowledge structure of Korean studies using document co-citation analysis and text mining techniques. This study divided Korean corpus into two perspectives: Self-perceived and others' perceived Korean studies. To this end, we collected 10,929 humanities and social literature containing the word Korea or Korean as a keyword in the SCOPUS database. As a result of analysis, a total of 20 subdomains were found in the knowledge structure of self-perception, and a total of 14 subdomains were found in the knowledge structure of otherts' perception. Differences in Korean Studies between two are: First, the sub-area of self-perceived Korean studies is subdivided into more diverse areas than the sub-area of other-perceived Korean studies. Second the major areas in self-perceived Korean studies are customers and services, industrialization, multiculturalism, mental health, tourism, Korean language, environment, and cities. Others' perceptions of Korean Studies are grouped into domestic and foreign situations of Korea, Korean pop culture, Koreans as US immigrants, and Korean language. Finally, the common areas of self-perception and others' perception were mental health, tourism, Korean language, North-Korean defectors, and juvenile delinquency.

• Journal of the Korean Society for Library and Information Science
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• v.58 no.1
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• pp.395-415
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• 2024

In the development of a university library's collection, the concept of patron-driven acquisition refers to a collection strategy that addresses users' direct information needs. In this study, an analysis of ten years' worth of book requests by user types was conducted to understand the topic preferences for efficient collection devleopment in the university library. In collection development, identifying subject areas of users' requested books is necessary for librarians to identify key areas of collection development and establish balanced collection development policies. To identify the major subject areas for each user group, KDC (Korean Decimal Classification) subject classifications were used, and network analysis techniques were applied to investigate the relationships between book topics in detail. The analysis revealed that "social sciences" emerged as the major topic across all user groups. However, in the analysis of sub-topics, "medicine" and "psychology" were distinctively identified as the major subject areas for graduate students, setting them apart from other user groups. The result of the network analysis further indicated that undergraduate students showed unique topics such as civil service, job placement, and career, which were not observed as major topic clusters in other user groups. On the other hand, graduate students tended to concentrate on a few specialized subjects, forming distinct topic clusters in the analysis.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10c
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• pp.435-437
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• 1998

영상에 대한 영역분할은 영상에 대한 인식 시스템에서 가장 중요하고도 어려운 분야로 알려져 있다. 주로 사용되는 방법은 화소중심기법과 영역중심기법이 사용되는데, 화소중심기법은 적은 시간이 걸리는데 비해 영역분할 효과가 떨어지고, 영역중심기법은 상대적으로 양질의 영역분할 효과를 얻을 수 있지만 많은 시간이 걸린다. 본 논문에서는 영역분할에 대한 방법으로 thresholding방법을 이용한 2단계로 이루어진 영역분할 방법을 제안한다. 제안된 방법은 화소의 전역정보와 지역정보를 모두 사용하여 기존의 전역 thresholding방법에 비해 향상된 영역 분할을 수행하고, 지역정보를 이용하는 영역중심 기법에 비해 시간을 단축하는 효과를 가지고 있다. 첫 번째 단계에서는 기존에 알려진 전역 thresholding방법을 사용하여 영역분할을 하고, 두 번째 단계에서는 영상에 대해 미리 알려진 사전지식을 이용하여 영역분할이 제대로 되지 않은 영역을 구분하여 해당 영역에 대해서만 thresholding작업을 수행한다. 사용된 영상은 자궁경부 세포진 영상으로 대상이 되는 영역은 자궁경부 세포의 핵으로 제한하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.6
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• pp.77-82
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• 2012

In this paper, the new location management scheme based on region and movement threshold has been proposed in order to minimize the required cost to handle the resource location management signaling traffics under the wire/wireless convergent networks when the users are moving around the cold and hot regions. In this scheme, the sequential paging is supposed to be performed according to the movement threshold which can be changed in accordance with the number of movements that each mobile user had made while it is moving around the resource regions. With the proposed scheme, the cost of managing the location management traffics and efficient spectrum assignment overhead can be minimized by placing signaling traffics for location managements and also allocating radio spectrum considering individual movement behaviors.

• Journal of the Korean Society for information Management
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• v.16 no.4
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• pp.95-107
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• 1999

Various approaches have been made for dividing images in content-based image retrieval. One of them defined five regions for images and conducted a series of experiments. A major assumption of the experiment is that the center regions of images are very important. It is based on the observation that meaningful objects are usually located in the center region of images. From this point of view, we tried to test if the assumptions is objectively valid by calculating and comparing PIM(Picture Information Measure) entropies of image regions proposed by S.K Chang. The experimental results showed that there were statistical PIM differences between the center and other regions.

• Journal of Korean Home Economics Education Association
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• v.19 no.4
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• pp.75-89
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• 2007

This study has its aim at suggesting new direction of our education to search different ways in housing contents by comparing the necessity perception and demands between teachers and students for housing contents in Technology Home Economics curriculum of middle school. To achieve this aim, I chose middle school teachers in charge of Technology Home Economics and male and female students who are in the first grade in high school in Ulsan. I sent e-mail, mail, and visited researcher to gather the data. I used SPSS +12 statistical package for frequency, percentage, mean, standard deviation, and t-test to analyze the data. Here is the result. First, In the part of application of living place, teachers had necessity perception in use and placement of furniture, and arrangement of objects. Students had necessity perception in the use and placement of furniture, the kind and choice of furniture. Also in the indoor environment and equipment part, both teachers and students had necessity perception in controlling of ventilation, temperature, and humidity. In the part of maintenance repair of housing, teachers had necessity perception in the need for maintenance management but students had necessity perception in house equipments and repair had high necessity perception Second, In housing-related general part, teachers demanded housing for elderly, disabled people, information about future housing and students demanded environmentally friendly living environment, housing for elderly, disabled people. In interior design part, teachers demanded in the expression of interior places through computer, the kind and characteristic of housing material and students demanded the way to reuse old furniture, kind and characteristic of housing material. In the part of housing preparation and occupation, teachers demanded the kind of housing-related occupation and students demanded the housing tax and the process of house purchase or concerned matter. Third, there were some difference of necessity perception and degree of demand between teachers and students. Teachers had higher necessity perception and demand in all part except in demand for housing equipment, maintenance, and environmentally friendly living environment.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1641-1644
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• 2004

3차원 볼륨데이터에서 분할 대상영역의 밝기 값이 다양하면서 밝기 값이 유사한 영역과 인접한 경우 3차원 영역확장(region growing) 방법을 사용하여 영역을 분할하기 위해서는 영역확장의 중요한 요인인 동질성 기준 값의 적절한 선택이 요구된다. 본 논문에서는 영역 복셀(voxel)의 1차 미분 값의 크기인 기울기 크기(gradient magnitude)만으로 영역의 경계를 찾기가 쉽지않은 대상의 분할을 위해 볼륨데이터의 지역적인 밝기 값의 변화의 특징을 고려하면서 분할 대상영역의 복셀의 2차 미분(second partial derivation)을 행렬의 요소(element)로 갖는 Hessian 행렬의 고유치(eigenvalue)를 영역확장의 문턱치 결정에 이용하였다. 제안한 알고리즘은 3차원 영역확장의 결과에 가장 큰 영향을 미치는 적절한 문턱치의 선택으로 대상영역의 분할을 성공적으로 수행하여 3차원 영역확장의 단점을 보완하였다.

• Journal of Korean Home Economics Education Association
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• v.16 no.4 s.34
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• pp.81-94
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• 2004

The purpose of this study was to research middle school students' interest and practice about the housing education contents in Technology and Home Economics Subject(classify them into three units, application of living space, indoor environment and equipments. support and repair of housing) in their real life. This was the investigation of which 529 middle school students have lived in Jeonbuk province, SPSS program was utilized to analyze percentage. mean and standard deviation. as well as t-test, One-Way ANOVA and Pearson's correlation coefficients. The results of this research were as follows: Middle school students' interest and practice of the housing education contents appeared to the middle level. Middle school students was consider that the order of interest parts of housing contents were indoor environment and equipments. application of living space, support and repair of housing. And the order of practice parts of housing contents were application of living space. indoor environment and equipments. support and repair of housing. There were significant differences in interest and practice of contents according to demographic variables such as sex, educational level of parents, social status of home. school record. Interest about the housing education contents had significant positive relationships with practices of contents of housing education. Therefore. it would be necessary to develop teaching materials and housing education contents promoting interest of students.