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정경아(Kyeong Ah Jeong),최경아(Kyungah Choi),석현정(Hyeon-Jeong Suk) 한국색채학회 2015 한국색채학회 학술대회 Vol.2015 No.5
본 연구는 영상의 배속과 색채 요소의 조합으로 강조될 수 있는 감성적 표현에 대해 탐색하고자 하였다. 일반인이 자가 촬영한 영상 53점을 대상으로 배속, 색상, 채도, 밝기, 대비의 속성을 제어하여 원본 대비 어떠한 감성이 다르게 표현될 수 있는가에 대하여 실험연구를 진행하였다. 대학생 30명을 대상으로 응답을 얻은 결과, 대비와 배속이 다른 속성에 비해 상대적으로 중요한 속성임을 밝혀내었다. 본 연구에서는 실험 연구에서 도출된 결과를 토대로 특정 감성을 효과적으로 표현할 수 있는 조합을 제안하고자 한다.
True White Point for Television Screens Across Different Viewing Conditions
Choi, Kyungah,Kim, Taesu,Chang, Jeonghwan,Suk, Hyeon-Jeong IEEE 2018 IEEE transactions on consumer electronics Vol.64 No.3
<P>This paper proposes the optimal white point settings of consumer televisions observed in different viewing conditions. The ratings from visual experiments were modeled with a bivariate Gaussian distribution to predict the optimal white points. Under dark surround conditions, where there is no effect of lighting chromaticity, the averaged optimal white point was located at a correlated color temperature of 7346 K and a Duv of −0.0015. The optimal white point was shifted toward a higher color temperature compared to the current standards. The results also indicated that current white point settings of major television manufacturers are too bluish. Neither televisions that meet the current standards nor televisions in the market would appear as true white under the viewing conditions employed in this paper. Moreover, the optimal white point depended largely on viewing conditions. Image content and ambient lighting conditions were observed to be important factors that influence the perception of the white point. The research therefore proposed to automatically change the white point of the display based on the image content and the real-time measurements of the surrounding ambient light falling on the screen. Ultimately, this paper might be of interest to the industry as a basis for future deliberations on target white points for consumer televisions designed to provide a better color appearance.</P>
박소연,Jeong Kyungah,Cho Eun Hye,Chung Hye Won 대한생식의학회 2021 Clinical and Experimental Reproductive Medicine Vol.48 No.1
In Korean women, a westernized lifestyle is associated with an increased risk of breast cancer. Fertility preservation has become an increasingly important issue for women with breast cancer, in accordance with substantial improvements in survival rate after cancer treatment. The methods of controlled ovarian hyperstimulation (COH) for fertility preservation in breast cancer patients have been modified to include aromatase inhibitors to reduce the potential harm associated with increased estradiol levels. Random-start COH and dual ovarian stimulation are feasible options to reduce the total duration of fertility preservation treatment and to efficiently collect oocytes or embryos. Using a gonadotropin-releasing hormone agonist as a trigger may improve cycle outcomes in breast cancer patients undergoing COH for fertility preservation. In young breast cancer patients with BRCA mutations, especially BRCA1 mutations, the possibility of diminished ovarian reserve may be considered, although further studies are necessary. Herein, we review the current literature on the practical issues surrounding COH for fertility preservation in women with breast cancer.
Optimal White Point of Television Under Varying Illuminants
Taesoo Kim,Kyungah Choi,Yeonhui Ji,Hyeon-Jeong Suk 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
This study investigates the optimal white point of QLED TV under varying illuminants, and the effect of the color temperature and the illuminance of ambient lighting on user preferences were observed. For a visual examination, a total of 8 nuanced whites were examined under 13 illuminants. A total of 8 display stimuli with different correlated color temperatures (4,000 K ~ 15,000 K) were presented on a QLED TV. The ambient illuminants ranged in correlated color temperature from 3,500 K to 8,000 K and from 0 lx to 1,000 lx in illuminance. Based on assessments by 104 subjects, an optimal color temperature of QLED TV is around 6,000 K to 7,000 K. However, the optimal display color temperatures lower than the default white point of Asian broadcasts. It is expected that the findings of this study can be used as the theoretical basis when designing a color strategy for TV display manufacturing or Asian broadcast white point.
Smartphone Use at Night Affects Melatonin Secretion, Body Temperature, and Heart Rate
Na, Nooree,Choi, Hojun,Jeong, Kyeong Ah,Choi, Kyungah,Choi, Kyungsun,Choi, Chulhee,Suk, Hyeon-Jeong Korean Society for Emotion and Sensibility 2017 감성과학 Vol.20 No.4
In the present study, we investigated the physiological effects of smartphone use at night when the display luminance and white balance were differently manipulated. Two levels of luminance and two types of white balance were combined to form four types of displays. Subjects were instructed to use smartphones between 23:00 to 01:00 twice a week for two weeks, and for each trial, subjects were given one of the four display types. Melatonin concentration in the saliva, body temperature and heart rate were measured before and after each experiment. The experimental result showed that the low luminance display supported melatonin secretion and thermoregulation compared to the high luminance display. With regard to the white balance, higher melatonin level was observed when using the display that filtered blue light. The low luminance display together with yellowish tint best supported restful sleep at night in terms of every physiological response. This study collectively demonstrates that bright and blue light emitted from smartphone displays adversely affect melatonin secretion, body temperature, and heart rate, and therefore, suggests the use of a display with low luminance or a display that filters blue light for a restful sleep at night.