DCT계수를 이용한 고속 프랙탈 압축 기법과 화상 심층암호에의 응용

이혜주,박지환,Lee, Hye-Joo,Park, Ji-Hwan 한국정보처리학회 1997 정보처리학회논문지 Vol.5 No.1

프랙탈 화상압축은 원화상을 일정 크기의 블럭으로 분할하고 자기 유사성(self -similarity)을 지닌 유사 영역을 탐색한다. 이 압축방식은 부가적인 코드북의 전송 이 필요하지 않아 높은 압축율을 달성하고 좋은 화질의 재생화상을 제공한다. 이러한 이점에도 불구하고 부호화시 유사 영역의 결정을 위한 복잡한 선형변환의 수행으로 인해 부호와 시간이 증가되는 단점이 있다. 본 논문에서는 블럭의 AC(alternating current)계수들을 이용하여 선형변환의 횟수를 감소시켜 부호화 시간을 줄이는 고속 프랙탈 화상압축을 제안한다. 제안 방식은 기존의 방식과 비교하여 좋은 화질을 제공 한다. 또한, 중요 기밀 데이터를 합성하는 화상 심층암호에 응용한 프랙탈 화상 압축 응용법을 제시한다. The fractal image compression partitions an original image into blocks of equal size and searches a do-main block having self-similarity. This method of compression achieves high compression ratio because it is unnecessary to transmit the additional codebook to receiver and it provides good quality of reconstructed images. In spite of these advantages, this method has a drawback in which encoding time increase due to a complicated linear transformation for determining a similar-domain block. In this paper, a fast fractal image compression method is proposed by decreasing the number of transformation usings AC(alternating current) coefficients of block. The proposed method also has a good quality as compared with the well-known fractal codings. Furthermore, method also has a good quality as apply the video steganography that can conceal an important secret data.

예비유아교사의 인지전략과 자기결정성 동기와의 관계

이혜주(Hye Joo Lee) 한국아동학회 2006 아동학회지 Vol.27 No.2

데이터마이닝을 이용한 청소년의 부모, 교사, 또래 애착유형별 예측모형 탐색

이혜주 ( Lee Hye-joo ),정의현 ( Jung Eui-hyun ) 한국아동교육학회 2016 아동교육 Vol.25 No.4

본 연구에서는 청소년의 부모애착 및 교사애착, 또래애착을 설명하는 예측변인과 변인들의 조합관계를 조사하기 위해 한국청소년패널조사(Korea Youth Panel Survey: KYPS)의 중 2패널 1차년도(3449명) 데이터를 대상으로 데이터마이닝의 의사결정트리를 사용해 애착을 예측하는 변인들을 유형별로 분석하였다. 그 결과, 부모애착은 부모감독, 생활만족도, 스트레스, 주변비난걱정, 수업참여도, 부모폭력, 자기신뢰, 주변인식문제아가 예측변인으로 추출되었으며, 교사애착은 수업참여도, 낙관적 성향, 부모감독, 친한 친구수, 생활만족도, 부모공부기대, 주변인식문제아, 집안경제곤란이, 또래애착은 성별, 자기신뢰, 주변인식문제아, 수업참여도, 생활만족도, 주변비난걱정, 부모감독이 애착을 설명하는 예측변인으로 추출되었으며, 이러한 변인들은 조합되는 다양한 조건에 따라 각 애착을 증가 또는 감소시키는 것으로 나타났다. 본 연구의 결과로 애착을 증가시키는데 있어서 유형별로 각 개인이 갖는 다양한 조건들을 효과적으로 활용할 수 있음을 제언하였다. This study explored prediction models for the types of adolescent attachment using the sample from KYPS (Korea Youth Panel Survey) data. Participants were 3449 middle-school students (2nd-grade). Data mining decision tree model was performed with total 27 independent variables related to person, home, and school and parent attachment, teacher attachment, and peer attachment as target variables. The results revealed that : (1) Parent monitoring, life satisfaction, stress, worrying the other people`s blame, class participation, parent abuse, self-believe, other-acknowledgement of the misdeed were significant determining factors for parent attachment. (2) Class participation, optimism, parent monitoring, number of friends, life satisfaction, parental expectation for children`s study, home economy difficulty, other-acknowledgement of the misdeed were significant determining factors for teacher attachment. And (3) gender, self-believe, other-acknowledgement of the misdeed, class participation, life satisfaction, worrying the other people`s blame, and parent monitoring were significant determining factors for peer attachment. These results suggest that students` diverse conditions and combinations of determining factors depending on the prediction models for the types of adolescent attachment should be considered individually in methods and programs for enhancing students` attachment.

데이터마이닝 기법을 이용한 스트레스 결정요인의 연차별 추이 분석

이혜주 ( Hye Joo Lee ),정의현 ( Eui Hyun Jung ) 한국아동교육학회 2014 아동교육 Vol.23 No.3

본 연구에서는 중·고등학생의 스트레스에 영향을 미치는 결정요인과 그 조합관계에 대한 연차별 추이를 조사하기 위해 한국청소년패널조사(KYPS; Korea Youth Panel Survey: KYPS) 중 2패널의 1차년도(중 2, 3449명), 3차년도(고 1, 3125명), 5차년도(고 3, 2967명) 데이터를 대상으로 데이터마이닝의 의사결정나무분석을 통해 학업관련 스트레스를 결정하는 요인들을 탐색하였다. 그 결과, 동일 대상이지만 중 2의 스트레스는 생활만족도, 성적, 여가활동만족도, 공격성, 주변비난걱정, 수업참여도, 자아존중감, 자기문제아인식이 영향을 미치는 요인으로 나타났으며, 고 1의 스트레스는 사교육시간, 생활만족도, 주변비난걱정, 낙관적성향, 개인공부시간, 컴퓨터 오락추구, 자아존중감이, 고 3의 스트레스는 개인공부시간, 자아존중감, 주변비난걱정, 자기신뢰, 여가활동만족도, 생활만족도, 사교육시간이 영향을 미치는 요인으로 나타났으며, 이러한 요인들은 조합되는 다양한 조건에 따라 스트레스를 증가 또는 감소시키는 것으로 나타났다. 본 연구의 결과로 스트레스를 증가시키는데 있어서 학년별로 각 개인이 갖는 다양한 조건들을 효과적으로 활용할 수 있음을 제언하였다. This study explored the annual changes on the determining factors for the middle and high school students`` academic-related stress using the sample from KYPS (Korea Youth Panel Survey) data. Participants were 3449 middle-school students (2nd-grade), 3125 high-school students (1st-grade), and 2967 high-school students (3rd-grade). Data mining decision tree models were performed with total 30 independent variables related to person, home, and school and academic-related stress as a target variable. The results revealed that : (1) Life satisfaction, grade, leisure satisfaction, aggression, worrying the other people``s blame, class participation, self-esteem, and self-acknowledgement of the misdeed were significant determining factors for 2nd-grade middle-school students. (2) The time of private education, life satisfaction, worrying the other people``s blame, optimism, the time of study, computer entertainment behavior, and self-esteem were significant determining factors for 1st-grade high-school students. (3) The time of study, self-esteem, worrying the other people``s blame, self-believe, leisure satisfaction, life satisfaction, and the time of private education were significant determining factors for 3rd-grade high-school students. These results suggest that students`` diverse conditions and combinations of determining factors depending on the annual changes should be considered individually in methods and programs for enhancing students`` stress.

테크놀로지가 현대 디자인에 미친 영향 -모더니즘을 중심으로-

이혜주 ( Hye Joo Lee ) 중앙대학교 생활문화산업연구소 [ 구-생활과학연구소] 2005 생활과학논집 Vol.22 No.-

Technology has influenced greatly, positive or negative, on modern art and design. Technology has made contribution greatly to socio-cultural environment - economics, human lifestyle, which has made social change as well as evolution of art and design. Technology has already merged with fashion and science to produce some amusing ``one-offs``. What is calle4 Modernism had been created by industrialization, or mechanic age based on functionalism, rationalism in specially Western Europe. Under these technological circumstances, through the study how the technology has changed trend on Design in Modernism, the purpose of this paper is to give directions in the field of forecasting trend in fashion industry.

"한류"를 통한 한국 패션산업의 발전방향

이혜주 ( Hye Joo Lee ) 중앙대학교 생활문화산업연구소 [ 구-생활과학연구소] 2005 생활과학논집 Vol.21 No.-

Hallyu` is the Korean Wave that is a rising in the Asian region these 5 years. We must develop ``Hallyu`` phenomenon into ``Love Korea Trend`` With proper strategies this Korean wave can be sustained and its impact globalised. The purpose of this paper is to give directions to promote and develop fashion industry to make the most of Hallyu Phenomenon. The results are as follows. 1. Regional Different strategy 2. Collaborative Branding 3. Emotional Brand Marketing 4. New Educational System in Stage Entertainment Design 5. Creating Korean Unique Lifestyle 6. PPL Marketing 7. Clustering Strategy of IT 8. Creating Korean Brand Essence(New Style) through Developing Traditional Culture.

현대 디자인에 응용한 데 스틸 ( De Stijl ) 운동의 조형언어 분석

이혜주(Hye Joo Lee) 중앙대학교 생활문화산업연구소 [ 구-생활과학연구소] 1995 가정문화논총 Vol.9 No.-

DCT 계수를 이용한 고속 프랙탈 압축 기법과 화상 심층암호에의 응용

이혜주(Lee Hye Joo),박지환(Park Ji Hwan) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.1

The fractal image compression partitions an original image into blocks of equal size and then searches a domain block having self-similarity. This method of compression achieves high compression ratio because it is unnecessary to transmit the additional codebook to receiver and it provides good quality of reconstructed images. In spite of these advantages, this method has a drawback in which encoding time increase due to a complicated linear transformation for determining a similar-domain block. In this paper, a fast fractal image compression method is proposed by decreasing the number of transformation using AC(alternating current) coefficients of block. The proposed method also has a good quality as compared with the well-known fractal codings. Furthermore, an application of the fractal coding is proposed to apply the video steganography that can conceal an important secret data.

아동의 수학 창의적 문제해결력과 관련이 있는 인지전략 유형 분석

이혜주(Hye Joo Lee) 한국아동학회 2007 아동학회지 Vol.28 No.6

20세기에 나타난 에코디자인의 개념적 특성에 관한 연구

이혜주 ( Hye Joo Lee ),이지연 ( Ji Youn Lee ) 중앙대학교 생활문화산업연구소 [ 구-생활과학연구소] 2006 생활과학논집 Vol.23 No.-

Eco-Design has been developed through 20th century giving message of environmental protection from environmental pollutions. In the respect of environment-friendly approach. Eco-Design is also called as Green Design and Sustainable Slow Design and so on. This study is to suggest concept and characteristics of Eco-Design developed in the 20th century by theoretical approach.