• KIEAE Journal
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• v.11 no.6
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• pp.53-62
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• 2011

This study aimed at suggesting improvement of lighting environment of the coffee house using study place. To this end, a series of field investigation was conducted in four possible target coffee houses around university. The field measurement included measurement of general illuminance and tabletop illuminance, observing illumination condition, and status of artificial lighting. Also, on-site questionnaire survey was administrated to 80 users of field measurement targets about using characteristics of coffee house and user's subjective response on light environment. The results are summarized as follows: (1) According to questionnaire survey, most of users checked 'learning (study and reading)' in 'purpose of coffee house using', and 'slightly dark' was checked most in each subjective response (brightness on general space and on tabletop at daytime/night); (2) as results of measurements on general illuminance and on tabletop illuminance during daytime, only one coffee house was suitable for standard; (3) as results of measurements on illuminance during night, all target coffee houses were not met the standard; (4) as results of uniformity ratios, almost uniformities of general illuminance were not met the standard except one case. The common problems of lighting environment of coffee house were analyzed as lack of daylight illumination e.g. having low amount of sunshine from skylight, un-uniformity of insolation by floor plan and absence of window blind, and un-uniformity of artificial luminous intensity e.g. lack of the number or brightness of artificial lighting, using the indirect lighting, using only local lighting, and non-uniform arrangement of artificial lighting.

• Journal of Fashion Business
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• v.24 no.2
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• pp.60-67
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• 2020

This study evaluated the Skin Whitening effects of 'fermented-C.' for Atrium cosmetics using a single-arm clinical trial. Twenty female adults (mean age 42.1 ± 6.6 year) were enrolled, all participants used this cosmetic product on their face for 4 weeks. The change of brightness (L-value) was measured by spectrophotometer while subjective assessments were also obtained to find the participants opinions on whitening and their general satisfaction measured by a 5-point scale (5 for very satisfactory, 5 for satisfactory, 3 for moderate, 2 for unsatisfactory, 1 for very unsatisfactory). The participants were also questioned about any adverse effects by filling out a self-monitoring report. The average L-value increased from 62.55 ± 2.14 on day 0 to 63.22 ± 1.96 after 4 weeks corresponding to a 1.1% brightness improvement (p < 0.01). The average scores for subjective whitening and general satisfaction were better than moderate with scores of 3.6 ± 0.5 and 3.7 ± 0.7, respectively. No notable complaints were reported regarding any kind of adverse effects such as erythema, itching or burning. The clinical data collected in this study supports that fermented-C. from Atrium cosmetics has whitening potential in a safe Functional Cosmetics package.

• Korean Journal of Optics and Photonics
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• v.12 no.6
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• pp.452-459
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• 2001

ICC profiles of output devices are necessary to solve the problem of color inconsistency between output devices. Therefore, output device manufacturers are offering ICC profiles that encode each model\`s color characteristics according to the specification decided in ICC (International Color Consortium). In this study, a program that can decode data of ICC profile was composed and evaluated the present condition of ICC profile files of domestic CRT monitor. As a result of comparing the ICC profiles of various model\ulcorner selling since 1999 from LG and Samsung companies, it was found that ICC profiles that are made at a similar time are the same regardless of model\`s specification and in some profiles, extraordinary data are saved. Accordingly, it can be said that current ICC profiles are made independently of the real monitor\`s color characteristics. This paper shows how color characteristics of a real monitor are affected by the control of brightness and color temperature, and proposes that the ICC profile has to be made from the data. measured in the optimum brightness state at each color temperature setting.

• Journal of the Semiconductor & Display Technology
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• v.19 no.4
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• pp.6-10
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• 2020

The silver nanowires (AgNWs) were synthesized by the conventional polyol process, which revealed 25 ㎛ and 30 nm of average length and diameter, respectively. The synthesized AgNWs were applied to the CdSe/CdZnS quantum dot (QD) based transparent light-emitting device (LED). The device using a randomly networked AgNWs electrode had some problems such as the high threshold voltage (for operating the device) due to the random pores from the networked AgNWs. As a method of improvement, a composite electrode was formed by overlaying the ZnO:Ga on the AgNWs network. The device used the composite electrode revealed a low threshold voltage (4.4 Vth) and high current density compared to the AgNWs only electrode device. The brightness and current density of the device using composite electrode were 55.57 cd/㎡ and 41.54 mA/㎠ at the operating voltage of 12.8 V, respectively, while the brightness and current density of the device using (single) AgNWs only were 1.71 cd/㎡ and 2.05 mA/㎠ at the same operating voltage. The transmittance of the device revealed 65 % in a range of visible light. Besides the reliability of the devices was confirmed that the device using the composite electrode revealed 2 times longer lifetime than that of the AgNWs only electrode device.

• Journal of Korean Society for Quality Management
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• v.50 no.4
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• pp.679-700
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• 2022

Purpose: Smart lighting adjusts brightness and color temperature according to weather, the user's activity, mood, etc. This study performed user experience(UX) evaluation of smart lighting in a living lab. The purpose of evaluating UX and analyzing the evaluation results is to improve user-friendliness and market competitiveness of smart lighting Methods: A living lab is a virtual or physical space where various stakeholders participate to develop, verify, and evaluate products, services, or systems in a real-life environment. In this study, an environment of using smart lighting was established in the Smart Safety Living Lab. Subjects performed UX evaluation after interacting freely with smart lighting in the Smart Safety Living Lab. Results: As a result of UX evaluation, it was confirmed that UX was overall excellent and subjects were satisfied with setting a desired indoor mood through smart lighting. However, operating the switch of smart lighting may be difficult due to its complexity, and it is needed to improve some functionalities such as the brightness range provided by smart lighting. Conclusion: This study is expected to contribute to establishing the way of UX improvement of smart lighting. This study is also expected to contribute to developing smart lighting as a high-quality product by reflecting the subjects' needs and UX derived in a real-life environment.

• Journal of Korea Multimedia Society
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• v.15 no.12
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• pp.1409-1416
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• 2012

An image segmentation result depends on pre-processing steps such as contrast enhancement, edge detection, and smooth filtering etc. Especially medical images are low contrast and contain some noises. Therefore, the contrast enhancement and noise removal techniques are required in the pre-processing. In this study, we present an extension by a novel histogram equalization in which both local and global contrast is enhanced using neighborhood metrics. When checking neighborhood information, filters can simultaneously improve image quality. Most important is that original image information can be used for both global brightness preserving and local contrast enhancement, and image quality improvement filtering. Our experiments confirmed that the proposed method is more effective than other similar techniques reported previously.

• 전자공학회논문지 IE
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• v.44 no.2
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• pp.47-53
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• 2007

The inverter using level control block (LCB) was developed to drive LCD TV backlight using FFL light source. The FFL striking time, time for brightness stabilization, and lamp current of FFL backlight were shown to improve by applying LCB in the inverter. It was also shown that the stable driving of LCD TV FFL backlight with the inverter using LCB was possible over the wide temperature range.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.418-420
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• 2017

전광판을 통해 이미지를 표시할 때 이미지를 구성하는 각 화소에 대응하는 도트들 별로, 모두 일정한 밝기로 색상을 출력하기 때문에 이미지 내에 다양한 색상이 포함되어 있는 경우, 상대적으로 밝은 색상이 어두운 색상보다 더 밝게 보이는 문제를 가지고 있다. 또한 기존의 전광판들은 전광판을 통해 글자를 표시할 때 글자의 크기에 관계없이 모두 일정한 밝기로 글자를 표시하기 때문에 상대적으로 작은 글자가 큰 글자에 비해 잘 보이지 않는 문제가 있다. 우리는 전광판을 통해 이미지를 표시할 때, 해당 이미지 내의 다양한 색상들에 따라 부분적으로 전광판의 각 도트들의 휘도를 서로 다르게 출력하고, 전광판을 통해 글자를 표시할 때, 글자의 크기 별로 휘도를 서로 다르게 출력함으로써, 전광판을 통해 표시되는 정보에 대한 가독성을 향상시킬 수 있는 RICS 시스템을 설계한다.

• Journal of the Korean Institute of Educational Facilities
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• v.4 no.3
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• pp.31-39
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• 1997

The purpose of this study was to improve the lighting environment of the VDT workspaces in computer laboratory. This study was carried out through the field measurements on the computer laboratory and a survey using the questionnaire about the VDT workspaces. The major findings of the study were as follows: (1) It was unbalanced among the illumination, luminance, and color distributions in the the VDT workspaces. (2) The difference of brightness between the CRT screen and its surroundings have presented on the whole unbalanced. (3) It was proved that the artificial light source of the ceiling lighting should use the parabolic louver luminaire limiting the radiant luminance.

• Proceedings of the KIEE Conference
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• 1998.11c
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• pp.783-785
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• 1998

In this study the emission characteristics of Sq dye undoped and doped specimen investigated. In Sq 14mol% doped specimen, OXD7 and Alq3 layer interpolated. This effect has been observed and mechanism characteristics have been examined. For OXD7 insert, hole flow the cathode intercept, and then hole accumulated. Because of increasing recombination probability of electron and hole highly pure color maintained. Simultaneously brightness characteristics and emission efficiency could improve.