• 한국멀티미디어학회논문지
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• 제22권8호
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• pp.860-873
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• 2019

LCD backlight boosting and the integration of boosting and dimming are proposed based on image analysis to maximize perceptual image qualities and to reduce display system power. Based on the histogram of the image data, methods for selecting an image suitable for boosting and for adjusting the optimum backlight brightness are proposed. A comprehensive combined optimization method of LCD backlight boosting, dimming and bypass based on image characteristics is also described. Perceptual image quality enhancement and power consumption are evaluated based on well known image databases. Average subjective image quality is improved by 24.8%, RMS contrast is improved more than 20%, and average power consumption is reduced by 15.94% compared to conventional uniform boosting.

• Journal of Information Processing Systems
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• 제19권6호
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• pp.756-766
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• 2023

To effectively track the illegal use of digital images and maintain the security of digital image communication on the Internet, this paper proposes a reversible multipurpose image watermarking algorithm based on a deep residual network (ResNet) and perceptual hashing (also called MWR). The algorithm first combines perceptual image hashing to generate a digital fingerprint that depends on the user's identity information and image characteristics. Then it embeds the removable visible watermark and digital fingerprint in two different regions of the orthogonal separation of the image. The embedding strength of the digital fingerprint is computed using ResNet. Because of the embedding of the removable visible watermark, the conflict between the copyright notice and the user's browsing is balanced. Moreover, image authentication and traitor tracking are realized through digital fingerprint insertion. The experiments show that the scheme has good visual transparency and watermark visibility. The use of chaotic mapping in the visible watermark insertion process enhances the security of the multipurpose watermark scheme, and unauthorized users without correct keys cannot effectively remove the visible watermark.

• 한국생활과학회지
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• 제10권1호
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• pp.15-31
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• 2001

The main purpose of this study was to explore the development of knowledge about the appearance-reality distinction and the perspective-taking ability and to examine its relation. The subjects were 104 children, 13 boys and 13 girls each at the age of 3, 4, 5, and 6. The performance of four age groups were compared on illusion appearance-reality, color appearance-reality, perceptual perspective-taking, and cognitive perspective-taking tasks. The data were collected by individual testing and analyzed by the two-way ANOVA with repeated measures, one-way ANOVA and Pearson Correlation Coefficients. The major results were as follows. 1. In children's understanding of the appearance-reality distinction, significant differences were found between 3-year-olds and 4-year-olds, and 5-year-olds and 6-year-olds. While between 4-year-olds and 5-year-olds showed no such differences. Besides, gender did not affect the children's understanding of the appearance-reality distinction. 2. There was significant difference in performance according to the type of tasks. That is 3-year-olds perform better illusion appearance-reality distintion than color appearance- reality distintion, while 4, 5, 6 year old children's performance of color appearance-reality and illusion appearance-reality distinction showed no difference. 3. In children's ability of perceptual perspective-taking, significant difference was found between 3, 4, 5-year-olds and 6-year-old children. And in ability of cognitive and perspective-taking, significant difference was found between 3, 4-year-olds and 6-year-old children. Besides, gender did not affect the children's perceptual and cognitive perspective-taking. 4. The color appearance-reality distinction and perceptual perspective-taking showed significant correlation. That is, the children of high grade for perceptual perspective-taking were better understanding of color appearance-reality distinction.

• 방송공학회논문지
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• 제19권4호
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• pp.468-477
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• 2014

본 논문은 FCS(foveated contrast sensitivity)를 이용한 인지품질 기반 비디오 코딩 방법을 제안한다. CS(contrast sensitivity)를 이용한 기존의 인지품질 기반 비디오 코딩 방법은 공간주파수에 따라 시각적 인지능력이 달라지는 인간시각체계(HVS, human visual system)의 특징을 이용하여 비디오 압축 시 인지품질의 손상을 최소화하며, FM(foveated masking)을 이용한 방법에서는 HVS의 중심시(central vision) 와 주변시(peripheral vision)의 차를 이용한다. 본 연구에서는, 정신물리학 실험을 통하여 기존의 DCT(discrete cosine transform)기반 JND(Just-noticeable difference) 모델과 FM이 서로 의존성을 갖고 동시에 고려된 새로운 FCS 모델을 제안하였고, 이를 HM10.0 부호화기에 적용하여 인지품질기반 부호화를 수행하였다. 제안된 방법으로 부호화된 영상은 인지품질 관점에서 동일한 화질을 유지하면서 평균 10%의 비트율 감소를 보였다.

• 한국의류학회지
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• 제8권1호
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• pp.21-27
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• 1984

The purpose of this study was to investigate the relationship between perceptual orientation and four aspects of clothing behavior. Perceptual orientation was measured with Choi's Perceptual Orientation Scale, and clothing satisfaction was assessed with Lim and Lee questionnaire. Clothing importance was measured with some items of Kirby's Clothing Attitudes and additional items prepared for this study, Clothing comfort was measured Ivith some items of Creekmore Scales of Eight Clothing Variables and additional items prepared for this study. Clothing conformity was measured by some items of Selker's The Clothing Conformity Inventory and Carpenter's Clothing Opinion Scale and the Kim questionnaire, along with additional items for this study. Altogether 43 items were used. The questionnaire was completed by 480 second year junior and senior high school boys in Seoul. Statistical analysis was performed using the correlation coefficient, t-tests, multiple regression analysis, and analysis of variance. The results were : 1) Perceptual orientation was positively related to clothing satisfaction. 2) Perceptual orientation was negatively related to clothing conformity. 3) Scores of senior high school boys on self-perception and total perception were significantly higher than these of junior high school boys. 4) Clothing satisfaction, clothing conformity and clothing importance were different according to the grade level. That is, junior high school boys had a higher clothing satisfaction ana senior high school boys had a higher clothing conformity and clothing importance score.

• 말소리와 음성과학
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• 제15권4호
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• pp.17-26
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• 2023

이 연구는 베트남인 성인 학습자들이 학습 단계별로 한국어 어두 초성 장애음을 어떻게 지각하는지 밝히고, 지각 훈련을 통해 오류가 교정될 수 있는지를 밝히는 것을 목적으로 한다. 이를 위해 베트남인 초급, 중급, 고급 학습자 105명을 대상으로 한국어 초성 장애음에 대한 지각 훈련을 실시하였다. 훈련 자료는 원어민 음성으로 녹음한 자연 자극으로 한국어의 최소대립쌍을 적극적으로 활용하여 제작하였다. 실험 집단에 속한 학습자들은 약 2주간에 걸쳐 20-40분의 자기주도적 지각 훈련을 5회 수행했고, 통제 집단에 속한 학습자들은 사전 테스트와 사후 테스트에만 참여하였다. 실험 결과 훈련 전에 잘 구분되지 않았던 음들에 대한 지각이 많이 개선되었고, 초급뿐만 아니라 고급 집단의 학습자들도 끝까지 교정이 잘 되지 않았던 음에 대한 효과를 보았다. 이 연구에서는 대규모의 지각 훈련을 통해 베트남인 학습자들이 한국어의 서로 다른 음을 구별하는 적절한 음향 단서를 학습하는 데 지각 훈련이 중요한 역할을 할 수 있음을 확인하였다.

• 한국음향학회지
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• 제29권4호
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• pp.270-277
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• 2010

본 논문에서는 독립 성분 분석 기법과 적응 지각 필터를 이용하여 잡음에 오염된 신호에서 잡음을 추정 및 제거함으로서 보다 효율적으로 오디오 신호를 개선하는 방법에 대해 제안한다. 기존의 적응 지각 필터는 묵음 구간에서 추정된 고정적인 추정 잡음을 사용하기 때문에 잡음이 시간에 따라 가변적일 경우 성능이 상당히 저하된다. 그러나 제안된 알고리즘은 독립 성분 분석 기법을 이용하여 신호 구간마다 달라지는 잡음을 추정한 후 이를 적응 지각 필터에 적용시켜 준다. 제안된 알고리즘의 성능 분석을 위하여 기존 및 제안된 알고리즘을 이용한 시뮬레이션을 수행하였으며, 그 결과로 제안된 알고리즘은 기존의 알고리즘에 비해 향상된 결과를 생성하였다. 더불어 음질의 열화도 적음을 확인할 수 있었다.

• 사상체질의학회지
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• 제4권1호
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• pp.81-106
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• 1992

The purpose of this study was to find out the causal relationship between perceptual level of stress and health state according to Korean constitutions and to analyze that effect on the Korean constitution's health state. Subjects of this study were 87 out patient department of constitution at Kyung-Hee Oriental Medicine Hospital. Data were collected by using interview with Questionaire during 6 months from Feb. 2 to June 31, 1991. The Measurement tools used by this researcher were Go's The Questionaire of Identify about constitution, Lee's stress scale and Go's modified Cornell Medical Index which were approved it's reliability and validity. All of the questionaires of were used after pre- test. For the purposes of the study, the collected data were analyzed by frequency, t-test, ANOVA and Pearson correlation. And then this research's issue was tested by SAS program's ANCOVA. The findings of this study was summarized as follow. 1. There was significantly differences in stress perceptual level in Korean constitution. (F=9.68, P=.000). The So Em In (小陰人) were higher than the other constitution on stress perceptional level. 2. In health state, there was significantly difference among Korean constitution. (F=6.654, P=.002). Also the So Em In (小陰人) was lower than the other constitution at health state. Therefore, it was considerate that So Em In (小陰人) was higher perceptual level of stress than the other constitution and the resulting poor health state. 3. Stressful perception was effected on the health state, as a result inverted correlation was constructed between stress perception and health state. (r=-.6034, P=.0001) 4. After exclusion of stress perceptual level, each of the Korean Constitution's health state was not difference (F=1.01, P=.37). It was mean that differences of the Korean Constitution's perceptual level of stress effected on the health state. Bacause So Em In (小陰人) had higher perceptual level of stress than other constitution (F=9.687, P=.000), in proportion to that one's health state was poor. From the results of this study, it could be concluded that the higher stress perceptual level according to Korean constitution, the poorer health state. Further study in this area needs to be consideration that in order to coping with stress, researcher grope for quality nursing intervention with more accurative assessment about Korean constitution.

• 대한가정학회지
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• 제24권4호
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• pp.117-130
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• 1986

This paper tries to find out the principle of the rational dwelling space planning based on the conception of the Lewin's‘life space’, and to find out the dwelling space factors from the form perceptual element appeared in phenomenological space.

• International Journal of Advanced Culture Technology
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• 제7권1호
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• pp.150-154
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• 2019

The purpose of this research is to identify major factors that influence the cognition the elderly in community. There was a significant correlation between the cognitive and visual perceptual skills of the elderly. The subject's cognitive skill was statistically higher for males by gender, for lower age group, and for higher level of education.