• Korean Journal of Cognitive Science
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• v.22 no.3
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• pp.235-254
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• 2011

Two experiments were conducted to investigate the impact of binocular disparity information on Neon color spreading (NCS). The stimuli was the modification of Ehrenstein figure used by Redies and Spillmann(1981); inner and outer segments were achromatic and middle segments was chromatic. In experiment 1, the effect of binocular disparity was tested in each segment that were divided inner, middle and outer segments. In experiment 2, the impact of added segments that were put in different depth place were tested. The results showed that the segments on same place were, the clearer the NCS was. Consistent with the previous studies, the effect of color segment in front or in behind was not appeared. The case of added segments, regardless of added segments were placed either front or behind, the NCS was reduced. But the effect of added outer segments was more affect then added inner segments. This results were suggested that NCS could be affected by depth information but more affected by stage of before depth processing.

• Korean Journal of Cognitive Science
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• v.17 no.1
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• pp.29-52
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• 2006

There has been a claim that Interaction between the cerebral hemispheres could reduce the effect interfering information (Weissman & Banich, 1999). We ran three experiments to show that between-hemisphere separation of target and distractor could be more effective for reducing interference than Interaction between the hemispheres. In experiment 1, a colored box and a rotor name were presented to a single or to separate hemispheres. In experiment 2 and 3, a colored circle (distractor) was presented along with a colored box and a color name which was always printed in black. In experiment 3, a peripheral cue was presented either to the target location(66.7%) or to the distractor location(33.3%) Immediately before the presentation of stimuli. In all experiments, the participants were asked to deride whether the moaning of the color matched the rotor of the box, Ignoring the printed rotor of the word(Exp. 1), or the color of the circle(Exp. 2 & 3). There were three renditions of distractor (congruent, incongruent, and neutral) and two conditions of matching (between- and within-hemisphere matching). If interhemispheric interaction were effective for interference reduction, there should be a decrease in the interference in the between-hemisphere compared to the within-hemisphere matching condition. The results showed that there was no difference in the interference between the two matching conditions in Exp 1. In Exp 2 and in the target-cue renditions of Exp. 3, the amount of interference in the between-hemisphere condition was greater than that in the within-hemisphere condition. These findings are consistent with what we have previously reported (Sohn et al., 1996, Sohn & Lee, 2003). However, when the distractor was precued in Exp. 3, the amount of interference did not differ between the two marching conditions. These results suggest that between-hemisphere separation of target and distractor can be more effective for reducing response interference than interhemispheric communication. It implies a possible role of an interhemispheric shielding mechanism (Merola & Liederman, 1985) to prevent the transfer of task-irrelevant, harmful information across the hemispheres.

• Journal of Biomedical Engineering Research
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• v.21 no.6
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• pp.551-558
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• 2000

이 연구의 목적은 시각의 유도운동을 기반으로 하는 새로운 현기증 진단 방법을 제시하는데 있다. 시각의 유도운동은 주위환경이 움직임에 따라 고정된 물체도 움직이는 것처럼 느끼는 현상이다. 실험은 방음실에서 수행되었으며, 전체적인 시스템은 PC, 조이스틱, 프로젝터 그리고 스크린으로 구성되어졌다. 현기증의 크기를 정량적으로 측정하기 위하여 세 가지의 다른 주수온도(1$0^{\circ}C$, 2$0^{\circ}C$,3$0^{\circ}C$)를 사용하는 온도자극법에 의해 현기증이 유도되어졌다. 또한, 색의 변화에 의하여 유발되어지는 COP(center of pressure)의 변동을 찾기 위해 여섯 가지색이 유도운동에 사용되어졌다. 그 결과, 유도운동이 현기증과 높은 연관성이 있다는 것과 색의 변화가 인체의 균형에 영향을 미친다는 것을 알 수 있었다. 그렇지만, 색 자체의 변화보다는 집중도와 선명도가 뛰어난 색의 조합으로 구성된 유도운동 시스템이 필요하다는 것도 알 수 있었다. 결론적으로 시각의 유도운동이 현기증의 정량적인 측정에 유용함을 알 수 있었고 이 연구가 현기증 진단 시스템의 개발에 확장되어 쓰여질 수 있을 것이다.

• Journal of Biomedical Engineering Research
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• v.21 no.2
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• pp.175-180
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• 2000

본 논문은 주행 중의 졸음방지를 목적으로 하는 각성시스템의 평가에 관한 연구이다. 졸음운전을 방지하는 데에는 각성도의 저하상태를 높은 정확도로 검출하는 기술과 그것을 해소하는 기술이 필요하다. 본 논문에서는 졸음운저자를 위해서 졸음각성시스템을 향상시켰다. 개발된 각성시스템의 평가를 위해서 졸음을 유도하는 단조로운 행위를 수행하면서 뇌파, 심전도, 안전도와 같은 생체신호를 측정하였다. 피험자가 졸음상태에 있을 때에 산소, 향, 여러 가지 색 자극을 제시함으로써 각성효과를 평가하였다. 졸음의 해소에 효율적인 일정한 양의 산소와 멘톨 성분이 함유된 향을 동시에 각성자극으로 제시하였을 때와, 노란색의 색 자극을 주었을 때 가장 각성에 효과적임을 확인할 수 있었다.

• Korean journal of applied entomology
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• v.53 no.1
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• pp.65-71
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• 2014

Frankliniella occidentalis is attracted to flowers and is a major pest of chrysanthemums. Even when some chrysanthemum plants are not flowering, the ones that have already flowered attract F. occidentalis. Therefore, we investigated the efficacy of chrysanthemum as a trap plant that attract F. occidentalis by using an olfactometer. The numbers of F. occidentalis collected from the flowers of pink, wihte and yellow standard chrysanthemums on a tray with wet paper during the flowering period were 18.4, 56.6, and 52.6 respectively; the numbers of F. occidentalis collected from leaves were 7.8, 16.6, and 15.4 respectively. the numbers of F. occidentalis collected from the buds of pink, white and yellow standard chrysanthemums were 15.2, 45.8, and 41.6 respectively; the numbers of F. occidentalis collected from the leaves were 2, 8.8 and 3.4 respectively. In the Y-tube olfactometer test, the number of F. occidentalis attracted to the 2-way arms of the Y-tube was not significantly different for the yellow, red, violet and white flowers. In the four-choice olfactometer test, when the same visual cues and odor cues were provided, the frequency of F. occidentalis was higher in the yellow (10.7) flowers than in the red (1.3), violet (3.7) and white (2.0) flowers. When visual cues with disturbed odor cues, F. occidentalis preferred yellow (10.0) color over red (3.3), violet (1.3) and white (3.0) colors. When the same visual and odor cues, except for yellow visual cues, were provided, F. occidentalis preferred white (8.3) color over red (4.7), violet (4.7) and yellow (2.0) colors. Therefore, F. occidentalis were attracted to buds before the flowering of chrysanthemum plants and attracted to yellow flowers after the flowering.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.05a
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• pp.190-193
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• 2001

본 연구는 색채환경이 정상인의 심전도에 미치는 영향을 정량적으로 분석하여 색채 환경이 인체에 미치는 영향을 규명하고자 하였다. 피험자는 색맹을 가지고 있지 않고 인지기능에 장애가 없는 정상 성인 남, 여 50명을 대상으로 하였다. 색채환경의 제시는 암실에서 백색 광원에 채색 필터를 사용하여 제시하였다. 피검자는 6가지 색채 환경 안에서 심전도를 측정하였으며, HRV 분석을 하였다. HF/LF의 비를 비교 분석하여 본 결과, 남자는 녹색에서 색채 자극전보다 자극후가 HF/LF의 비가 0.508(p<0.07) 상승한 것을 볼 수 있었으며, 여자는 파랑색에서 색채자극전보다 자극후 HF/LF의 비가 0.677상승한 것을 볼 수 있었다. 이는 남자는 녹색에서 여자는 파랑색에서 더욱 편안함과 안락감을 느끼게 된다는 것을 의미한다. 따라서 본연구의 결과는 색채 환경이 인체에 미치는 영향을 규명함으로써 좀 더 편안한 색채 환경의 설계에 도움을 줄 것으로 기대된다.

• Journal of the Korean Ceramic Society
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• v.36 no.8
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• pp.820-828
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• 1999

This study suggests the accurate method to calculate dominant wavelength and excitation purity which are used for analyzing color of glass product. Instead of ruler and magnified chromatricity diagram by using the slope of lines by tristimulus measured and achromatic timulus and by monochromatiic stimulus and achromatic stimulus calculating method of dominant wavelength and excitation purity was acquired with the relation between them. When it was applied to products the obtained results were more accurate than those from existing methods.

• The KIPS Transactions:PartB
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• v.11B no.2
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• pp.169-176
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• 2004

This paper presents a new color correction method for color reproduction on LCD-based monitor by means of high-order multilayer neural networks. LCD monitors have nonlinear characteristics from various displaying system components. To overcome these nonlinearities and produce quality image, we need a nonlinear transformer for color coordinate transformation between the LCD monitor coordinates and the input color stimulus values. A high-order multilayer neural network is effectively trained to learn a mapping to determine the required color value of monitors for producing a given color stimulus. From the experimental results, the proposed method is effective in reproducing the color images.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.44 no.2 s.314
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• pp.46-54
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• 2007

In current printer industry, four or more colorants are added for color gamut extension because the gamut of printer is smaller than other devices. However, these additional colorants make a redundancy problem that several combinations of colorants reproduced same color stimulus in colorimetric inverse characterization process. Thus, we propose a method of colorimetric inverse characterization using color correlation between colorant's amount. First, for analyzing the combination of colorants which represent the same color stimulus, we estimate the color stimulus for all combination of colorants by Cellular Yule-Nielsen Spectral Neugebauer printer model. The combination of colorants which has higher color correlation factor comparing combinations of colorant around itself in color space is selected. It can reduced the color difference from the tetrahedral interpolation process which is estimation of the output value(colorants combination) for arbitrary input(color stimulus). The selected combinations of colorants and their color stimulus are stored to the lookup table. In experiment, the CMYKGO printer was used. As a result, the dark region of color gamut was extended and the color tone was more naturally represented.

• Science of Emotion and Sensibility
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• v.22 no.1
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• pp.55-64
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• 2019

Stress is accompanied by changes in the responses of the autonomic nervous system, and the heart rate variability (HRV) index is a quantitative marker that reflects autonomic responses induced by stressors. In this study, we observed changes in the autonomic responses induced by combinations of 30% oxygen administration and color light for stress relaxation. In all, 42 participants produced stress symptoms over the preceding two weeks, as rated on the stress response scale. After stress assessment, they were exposed to three therapeutic conditions, and electrocardiogram (ECG) signals were recorded before, during, and after therapy. The three therapy conditions consisted of only 30% oxygen administration with white light, a combination of 30% oxygen and orange light, and a combination of 30% oxygen and blue light. The HRV indices extracted from ECG signals were heart rate (HR), the standard deviation of the RR interval (SDNN), the mean square root of consecutive RR interval difference values (RMSSD), the low frequency component of HRV (LF), the high frequency component (HF), and the LF/HF ratio. These indicators were used to compare mean values before and after therapy. The results showed that HR and the LF/HF ratio were significantly lower after therapy than before it. In particular, the condition with 30% oxygen and blue light yielded significantly greater RMSSD and HF increases, as well as decreases in LF/HF ratio than in other two conditions. Our results suggest that therapy with 30% oxygen and blue light is the most effective for the relaxation of stress, which implies autonomic balance by parasympathetic activation.