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Preference of the Various Primary Colors on the Non-Transparent Display and Transparent Display
Hyeyoung Ha,Youngshin Kwak,Hyosun Kim,Young-jun Seo,Won-Sang Park 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
The preferred primary colors of the transparent display and non-transparent display were investigated under 3000K surround light correlated color temperatures (CCTs). The psychophysical experiment was conducted on the 24-inch LCD display and two different display (the non-transparent display and 40% transparent display) were simulated to have three different display CCTs (3000, 5000 and 6500K). Red apple, green grass and blue sky images were selected as the test image and each image was manipulated to have various primary chromaticities. About 15, 18, 15 chromaticity coordinates were selected to simulate the red, green and blue primary colors respectively. Twenty subjects participated in the psychophysical experiment and they were asked to answer the preference of each image using 7-points Likert-scale. From the psychophysical experiment result, two major findings were discovered. First, the Red primary color having the longer dominance wavelength is preferred regardless of the display CCT and display type. Second, there is no huge image preference difference between the transparent display and the non-transparent display.
Ha Hyeyoung,Kwak Youngshin,Kim Hyosun,Seo Young-jun,Jo Sung-Chan 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.3
A psychophysical experiment was conducted to compare the discomfort luminance level and the brightness of a head-mounted display (HMD). The results showed that as the size of the HMD stimulus increased, both the discomfort luminance level of the HMD and the brightness of the HMD decreased, but the influence of the size change was more dramatic on the discomfort luminance level than on the brightness. This study showed that to provide a comfortable luminance level for HMDs, the adaptation luminance level and the size of the HMD stimulus should be considered. However, it cannot be predicted in terms of brightness.
Ha Hyeyoung,Lee Hayoung,Heo Inhye,Seo Young-jun,Kim Hyosun,Yi Yongwoo,Kwon Jaejoong,Lee Changhee 한국정보디스플레이학회 2022 Journal of information display Vol.23 No.2
A wider array of color gamut and higher luminance are increasingly offered by displays to provide users with immersive content. However, in the latest displays available, it is difficult to predict image brightness because the extensively used color appearance model is made based on a color patch whose color appearance is not the same as that of an image on the display. Therefore, in this study, a method of predicting image brightness on a display depending on its color gamut by quantifying the Helmholtz–Kohlrausch (H–K) effect is proposed. A method for accurately measuring image luminance is also presented. To verify the performance of the proposed model, a brightness matching experiment is performed under two different color gamut sizes. The experimental results confirm that the image appears brighter with the increase in color gamut due to the H–K effect, demonstrating that the proposed prediction model exhibits desirable performance. The proposed brightness prediction model, which includes the image experience in the color range, delivers better image quality to users.
Hyeyoung K Park,Joohyun Chung,Jiyeon Ha 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aim(s): Despite the various benefits of information and communication technology (ICT), such as convenience and efficiency, many older adults have trouble accepting new technologies. It is necessary to identify the reasons for low ICT use among older people despite their positive attitudes toward ICT to help older adults cope with social changes and bridge the digital divide. This study explored technology acceptance and related factors among older adults who live in rural areas by proposing a new conceptual framework for the level of technology acceptance based on the existing model (Senior Technology Acceptance Model, STAM) and tested the new framework using pathway analysis. Method(s): A semi-structured open-ended interview was conducted among three focus groups (n=15) and a survey questionnaire were collected from older Korean adults living in the rural area (n=233). Qualitative data were analyzed using directed content analysis, and quantitative data were analyzed using pathway analysis. Result(s): Four themes, 11 subthemes, and 18 codes were identified, and new conceptual framework was proposed based on the qualitative findings. The results of the model revealed significant positive direct paths from external controls (β=0.44, p<0.01), attitudinal belief (β=0.34, p<0.01), and cognitive health (β=0.10, p=0.03) to the internal abilities. Conclusion(s): It is necessary to develop and apply a targeted and tailored ICT education program to improve self-efficacy and reduce anxiety in using technology for older adults living in rural areas.
Lee, Hyeyoung,Min, Ji Won,Kim, Ji-Il,Moon, In-Sung,Park, Ki-Hyun,Yang, Chul Woo,Chung, Byung Ha,Oh, Eun-Jee Williams & Wilkins Co 2016 Medicine Vol.95 No.11
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>With the development of the single antigen beads assay, the role of donor specific alloantibody (DSA) against human leukocyte antigens in kidney transplantation (KT) has been highlighted. This study aimed to investigate the clinical significance of DQ-DSA detected at renal allograft biopsy. We evaluated 263 KT recipients who underwent allograft biopsy and DSA detection at the same time. Among them, 155 patients who were nonsensitized before transplantation were selected to investigate the role of de-novo DQ-DSA. Both the total and nonsensitized subgroup was categorized into 4 groups each according to DSA results as: DQ only, DQ + non-DQ, non-DQ, and no DSA. In the total patient group, post-KT DSA was positive in 79 (30.0%) patients and DQ-DSA was most prevalent (64.6%). In the nonsensitized subgroup, de-novo DSAs were detected in 45 (29.0%) patients and DQ-DSA was also most prevalent (73.3%). The DQ only group showed a significantly longer post-KT duration compared to the other groups (<I>P</I> < 0.05). The overall incidence of antibody-mediated rejection (AMR) was 17.9%. B-DSA, DR-DSA, and DQ-DSA were associated with AMR (<I>P</I> < 0.05), but in the analysis for chronic AMR, only DQ-DSA showed significance in both the total and the nonsensitized subgroup (<I>P</I> < 0.05). On comparison of Banff scores among groups, those representing humoral immunity were significantly dominant in all DSA positive groups compared to the no DSA group (<I>P</I> < 0.05), and higher scores of markers representing chronic tissue injury were more frequently detected in the groups with DQ-DSA. The worst postbiopsy survival was seen in the DQ + non-DQ group of the total patient group, and patients with de-novo DQ-DSA showed poorer graft survival in the nonsensitized subgroup compared to the no DSA group (<I>P</I> < 0.05). In the multivariate analysis, de-novo DQ-DSA was the only significant risk factor associated with late allograft failure (<I>P</I> < 0.05). Our study is the first to demonstrate the association of DQ-DSA with detailed histological findings representing chronic AMR. These findings suggest that the detection of DQ-DSA in nonsensitized patients is significantly associated with the development of chronic AMR and late allograft failure. Therefore monitoring of DQ-DSA not only in sensitized patients, but also nonsensitized patients may be necessary to improve long-term allograft outcomes.</P></▼2>
20대 여성 대상 안티에이징 담론 분석-영패션잡지『쎄씨(Ceci)』를 중심으로-
신혜영 ( Hyeyoung Shin ),안진현 ( Jinhyun Ahn ),하지수 ( Jisoo Ha ) 한국의류학회 2017 한국의류학회지 Vol.41 No.4
With the increasing media representation of aging as negative and abnormal, anti-aging products and discourses are spreading to younger generations. This paper analyzes the anti-aging discourse in a fashion magazine targeted towards women in their 20s. It quantitatively analyzes the historical development of the antiaging industry and discourses from 1994 to 2014 in the magazine『Ceci』. It also analyzes the patterns of signification associated with aging in the magazine through the use of critical discourse analysis. This paper identifies five major discourses -“segmentation of the definitions of youthful appearance”, “scientific and medical discourse”, “self-care discourse”, “prevention of aging”, and “social values of youthful appearances”. The paper finds that the construction of anti-aging discourses towards women in their 20s is heavily influenced by the close link between the anti-aging industry and the fashion media. It also confirms the ideology of self-development though a rigorous appearance-management that is strongly imposed on Korean women and subsequently reproduced in an anti-aging discourse towards women in their 20s.
Fate of Astrocytes in The Gerbil Hippocampus After Transient Global Cerebral Ischemia
Kim, Hyeyoung,Park, Joon Ha,Shin, Myoung Cheol,Cho, Jun Hwi,Lee, Tae-Kyeong,Kim, Hyunjung,Song, Minah,Park, Cheol Woo,Park, Young Eun,Lee, Jae-Chul,Ryoo, Sungwoo,Kim, Young-Myeong,Kim, Dae Won,Hwang, MDPI 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.4
<P>Neuronal death and reactive gliosis are major features of brain tissue damage following transient global cerebral ischemia (tgCI). This study investigated long-term changes in neuronal death and astrogliosis in the gerbil hippocampus for 180 days after 5 min of tgCI. A massive loss of pyramidal neurons was found in the hippocampal CA1 area (CA1) area between 5 and 30 days after tgCI by Fluoro-Jade B (FJB, a marker for neuronal degeneration) histofluorescence staining, but pyramidal neurons in the CA2/3 area did not die. The reaction of astrocytes (astrogliosis) was examined by glial fibrillary acidic protein (GFAP) immunohistochemistry. Morphological change or degeneration (death) of the astrocytes was found in the CA1 area after tgCI, but, in the CA2/3 area, astrogliosis was hardly shown. GFAP immunoreactive astrocytes in the CA1 area was significantly increased in number with time and peaked at 30 days after tgCI, and they began to be degenerated or dead from 40 days after tgCI. The effect was examined by double immunofluorescence staining for FJB and GFAP. The number of FJB/GFAP<SUP>+</SUP> cells (degenerating astrocytes) was gradually increased with time after tgCI. At 180 days after tgCI, FJB/GFAP<SUP>+</SUP> cells were significantly decreased, but FJB<SUP>+</SUP> cells (dead astrocytes) were significantly increased. In brief, 5 min of tgCI induced a progressive degeneration of CA1 pyramidal neurons from 5 until 30 days with an increase of reactive astrocytes, and, thereafter, astrocytes were degenerated with time and dead at later times. This phenomenon might be shown due to the death of neurons.</P>