• 한국컴퓨터정보학회논문지
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• 제19권2호
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• pp.49-56
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• 2014

본 논문은 일상적으로 많이 복용되는 알약의 오남용을 막기 위해 알약 대한 정보를 내용기반 인식을 통해 검색하고자 하는데, 이때 알약의 색 특징 정보와 모양 특징 정보를 이용하여 내용기반 검색을 하는 CBIRS/TB를 제안한다. 기존 FE-CBIRS에서는 색상과 모양에 대한 정보를 추출하여 영상을 구분하는 특징정보로 적용하는 문제점이 있다. 즉 검색시 적용하는 물체의 색상 특징 정보는 색상, 채도, 명도의 각각에 대한 평균, 표준편차, 왜도를 사용하며 부분영역을 특징정보로 적용하는 경우 대표색상만을 적용하는 문제점이 있다. 또한 모양특징정보의 경우 추출된 부분영역들에 대한 불변모멘트가 주로 사용한다. 이로 인한 처리시간의 문제, 정확성의 문제점이 있다. 따라서 본 논문에서 이를 개선하기 위한 방법으로 추출된 영상의 색상 특징정보들을 클래스별로 구분하여 인덱싱하여 검색속도와 정확도를 향상시켰다.

• Journal of the Optical Society of Korea
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• 제13권1호
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• pp.65-74
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• 2009

Device quality indium tin oxide (ITO) films are deposited on glass substrates and ultra-thin diamond-like carbon films are deposited as a buffer layer on ITO by a pulsed Nd:YAG laser at 355 nm and 532 nm wavelength. ITO films deposited at room temperature are largely amorphous although their optical transmittances in the visible range are > 90%. The resistivity of their amorphous ITO films is too high to enable an efficient organic light-emitting device (OLED), in contrast to that deposited by a KrF laser. Substrate heating at $200^{\circ}C$ with laser wavelength of 355 nm, the ITO film resistivity decreases by almost an order of magnitude to $2{\times}10^{-4}\;{\Omega}\;cm$ while its optical transmittance is maintained at > 90%. The thermally induced crystallization of ITO has a preferred <111> directional orientation texture which largely accounts for the lowering of film resistivity. The background gas and deposition distance, that between the ITO target and the glass substrate, influence the thin-film microstructures. The optical and electrical properties are compared to published results using other nanosecond lasers and other fluence, as well as the use of ultra fast lasers. Molecularly doped, single-layer OLEDs of ITO/(PVK+TPD+$Alq_3$)/Al which are fabricated using pulsed-laser deposited ITO samples are compared to those fabricated using the commercial ITO. Effects such as surface texture and roughness of ITO and the insertion of DLC as a buffer layer into ITO/DLC/(PVK+TPD+$Alq_3$)/Al devices are investigated. The effects of DLC-on-ITO on OLED improvement such as better turn-on voltage and brightness are explained by a possible reduction of energy barrier to the hole injection from ITO into the light-emitting layer.

• 한국식생활문화학회지
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• 제28권4호
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• pp.386-391
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• 2013

This study investigated the effects of freeze-dried sweet pumpkin powder on the baking of bread. Freeze-dried sweet pumpkin powder (0, 3, 6, 9, or 12%) was supplemented during the baking process and the bread volume, weight, specific volume, baking loss rate, texture, and sensory characteristics were measured. The results were following. Freeze-dried sweet pumpkin contained 4.88% water, 4.40% protein, and 4.02% ash. The L-values (brightness) of the bread were significantly lower as increasing amounts of sweet pumpkin powder were added (p<0.001). However, higher values for the a-value (redness) and b-value (yellowness) were observed (p<0.01 for both values). The volume and baking loss rate decreased when the sweet pumpkin powder was added. In contrast, the weight significantly increased as sweet pumpkin powder was added (p<0.01) and the intensity of dark brown color increased. The outer side of the bread was balanced overall, but the outer skin of the bread appeared darker as the amount of sweet pumpkin powder increased. The overall acceptability, hardness (p<0.001), elasticity (p<0.01), cohesiveness (p<0.01), gumminess (p<0.01), and brittleness (p<0.001) increased as sweet pumpkin powder increased as well. However, when sweet pumpkin powder was added at 12%, the overall acceptability value was fairly low. Sensory parameters, such as taste (p<0.001), color (p<0.001), and flavor (p<0.05) were observed when sweet pumpkin powder was used at 3% and these results were lower than the control. Overall acceptability (p<0.001) was best when sweet pumpkin powder was used at 9% and the texture was best when sweet pumpkin powder was used at 6%.

• 패션비즈니스
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• 제14권6호
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• pp.53-69
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• 2010

This study compared the work environment colors and the colors of working clothes by conducting a field survey of domestic machinery manufacturers who are playing a central role in Korean industries so as to develop and evaluate working clothes based on the safety of workers and environmental harmony. For the study method, after the color-related requirements were collected through interviews and field surveys, the fabrics for working clothes were woven and the colors were selected using the requirements. The designs of working clothes were developed with an emphasis on color design. The colors of the working clothes were also analyzed in their relationship to the working environment. The evaluations were separately performed for the appearance and the colors with workers of D machinery manufacturing company. The appearance and color satisfaction, safety, psychology, and harmony with environment were evaluated on a 5-point scale by workers and their safety managers. Furthermore, pictures of the workers in their existing working clothes and the newly developed working clothes were taken with a digital camera while they were working in the field. The RGB values of the pictures were extracted using Photoshop ver. 7.01, which were converted to HVC values using Munsell Conversion ver. 4.0.1. This study found that higher satisfaction levels were shown for the newly developed working clothes compared to the existing ones. The actual measurements also showed that the newly developed had higher brightness and clearer chromatic contrast than the existing ones, indicating higher explicitness and attention for safety of workers. These types of studies can contribute to the integrated working environment plan of machinery manufacturers.

• 패션비즈니스
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• 제20권4호
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• pp.50-71
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• 2016

This study analyzed the recognition rate of QR codes printed by digital transfer textile printing for mobile application. The purpose was to identify conditions that increase recognition rates of QR codes printed on textile, in order to increase utility of QR codes in the textile and fashion industries. The study focused on differences in the color of the QR codes and denier, which is a unit of textile fineness measurement, of the textile on which the QR codes were printed. And the recognition rates of QR codes according to the color and denier were analyzed. According to the result of this study, the colors of QR codes had an effect on the recognition of the codes by mobile applications. Specifically, strong contrast, i.e., bright background and relatively dark module, increased the recognition rate of the QR codes. Digital transfer textile printing tend to change the hue of red and yellow and increase brightness, and change in the printed colors also had an effect on the recognition rate of QR codes. There was a clear difference in the color and recognition rate of the printed QR code according to the denier of the textile, and this suggests denier has an effect on the recognition rate. The findings in this study can provide basic data for future research on QR codes digital printed on textile.

• 천문학회보
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• 제44권1호
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• pp.38.4-38.4
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• 2019

Ultra-diffuse galaxies (UDGs) are intriguing in the sense that they are much larger than dwarf galaxies but have much lower surface brightness than normal galaxies. To date, UDGs have been found only in the local universe. Taking advantage of deep and high-resolution HST images, we search for UDGs in massive galaxy clusters in the distant universe. In this work, we present our search results of UDGs in three massive clusters of the Hubble Frontier Fields: Abell 2744 (z=0.308), Abell S1063 (z=0.348), and Abell 370 (z=0.375). These clusters are the most distant and massive among the host systems of known UDGs. The color-magnitude diagrams of these clusters show that UDGs are mainly located in the faint end of the red sequence. This means that most UDGs in these clusters consist of old stars. Interestingly, we found a few blue UDGs, which implies that they had recent star formation. The radial number densities of UDGs clearly decrease in the central region of the clusters in contrast to those of bright galaxies which keep rising. This implies that a large fraction of UDGs in the central region were tidally disrupted. These features are consistent with those of UDGs in nearby galaxy clusters. We estimate the total number of UDGs (N(UDG)) in each cluster. The abundance of UDGs shows a tight relation with the virial masses (M_200) of thier host systems: M_200 \propto N(UDG)^(1.01+/-0.05). This slope is found to be very close to one, indicating that efficiency of UDGs does not significantly depend on the host environments. Furthermore, estimation of dynamical masses of UDGs indicates that most UDGs have dwarf-like masses (M_200 < 10^11 M_Sun), but a few UDGs have $L{\ast}$-like masses (M_200 > 10^11 M_Sun). In summary, UDGs in distant massive clusters are found to be similar to those in the local universe.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권5호
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• pp.1814-1828
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• 2021

Low-light image enhancement is a key technique to overcome the quality degradation of photos taken under scotopic vision illumination conditions. The degradation includes low brightness, low contrast, and outstanding noise, which would seriously affect the vision of the human eye recognition ability and subsequent image processing. In this paper, we propose an approach based on deep learning and Retinex theory to enhance the low-light image, which includes image decomposition, illumination prediction, image reconstruction, and image optimization. The first three parts can reconstruct the enhanced image that suffers from low-resolution. To reduce the noise of the enhanced image and improve the image quality, a super-resolution algorithm based on the Laplacian pyramid network is introduced to optimize the image. The Laplacian pyramid network can improve the resolution of the enhanced image through multiple feature extraction and deconvolution operations. Furthermore, a combination loss function is explored in the network training stage to improve the efficiency of the algorithm. Extensive experiments and comprehensive evaluations demonstrate the strength of the proposed method, the result is closer to the real-world scene in lightness, color, and details. Besides, experiments also demonstrate that the proposed method with the single low-light image can achieve the same effect as multi-exposure image fusion algorithm and no ghost is introduced.

• 한국수산과학회지
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• 제55권3호
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• pp.294-301
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• 2022

Laver Pyropia tenera snack is typically manufactured as an attached laver and carbohydrate-based rice papers or glutinous rice paste. Carbohydrates contribute to a crispy texture and many various additives are used for development of texture. Isomalto-oligosaccharide (IMO) and corn starch (CS) are typical additives in snack products that produce several changes, including texture. We investigated physicochemical properties of laver snacks prepared using IMO/CS ratios of 1:0 (Sample 1), 3:1 (Sample 2), 1:1 (Sample 3), 1:3 (Sample 4), and 0:1 (Sample 5). All of the prepared laver snacks displayed constant drying rates up to 45 minutes. Samples 1 and 5 had higher drying rates than the other laver snacks. Concerning CIE color values, Sample 5 displayed the highest brightness (L^*) value (78.89) and lowest yellowness (b^*) value (6.66). In contrast, Sample 1 displayed the lowest L^* value (74.65) and highest b^* value (17.23). The hardness proportionally decreased along with IMO content. In the sensory evaluation, overall acceptance was highest for Sample 1 with the highest oligosaccharide content.

• 한국음향학회지
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• 제42권3호
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• pp.203-213
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• 2023

의료용 초음파 영상 시스템에서, 영상점의 밖에서 오는 신호가 초음파 수신 집속 과정에서 완전히 제거되지 않으면 부엽을 발생시킨다. 부엽의 시간 신호가 영상점에서 오는 시간 신호(주엽)와 같이 중첩되어 나타나면 시간 영역에서 필터 처리를 이용하여 완전히 제거하기 어렵다. 그러나 수신 집속 과정에서 시간 -채널 신호를 푸리에 변환하면, 주엽과 부엽의 신호는 주파수 스펙트럼 영역에서 공간적으로 분리가 된다. 따라서 스펙트럼 영역에서 계산한 주엽과 부엽의 신호크기를 이용하여 크기 가중치를 계산하여 영상에 곱함으로써 부엽을 억제하였다. 그리고 주엽과 부엽의 스펙트럼이 인접할 때, 주엽과 부엽 스펙트럼 사이의 거리에 따라 거리 가중치를 적용하였다. 64 채널 선형 트랜스듀서를 사용하는 5 MHz의 초음파 영상 시스템에서 점확산 영상과 다른 밝기의 낭종을 가지는 스페클 영상을 합성하고 가중치를 적용하여 초음파 영상을 계산하였다. 점반사체 영상에서 해상도의 변화 없이 부엽이 크게 줄어들었으며 낭종 영상에서 대조도가 크게 개선됨을 컴퓨터 시뮬레이션으로 확인하였다.

• 대한전자공학회논문지SP
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• 제47권4호
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• pp.63-68
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• 2010

프린터와 모니터 장치간의 색 일치를 위한 색 관리 시스템으로 ICC 프로파일을 사용한다. 그러나 모니터 각각의 실제 출력색 자극은 색온도, 밝기, 대비와 같은 모니터의 사용자 설정 값에 따라 달라지고 이를 ICC 프로파일은 반영하지 않기 때문에 실제 이러한 색 관리 시스템을 이용하여 모니터의 색을 프린터에 그대로 재현하기는 어렵다. 또한 LCD 모니터의 경우 사용 시간에 따라 백라이트의 밝기와 색이 변하기 때문에 모니터의 출력 색 자극값은 시간에 따라 달라진다. 이러한 문제를 해결하기 위해 본 논문에서는 모니터의 ICC 프로파일 정보를 보정하여 실제 모니터의 출력 색 자극 값을 추정한다. 테스트 영상의 출력물과 모니터, 프린터 ICC 프로파일을 이용한 소프트 프루핑 과정으로 모니터에 재현된 테스트 영상을 칼라 매칭을 통하여 일치하는 과정에서 모니터 ICC 프로파일 정보를 보정한다. 추정된 모니터 ICC 프로파일은 일반적인 색 관리 시스템에서 동일하게 적용하여 입력 영상을 프린터로 출력한다. 실험 결과 기존의 ICC 프로파일을 사용한 경우보다 보정된 ICC 프로파일을 사용해서 출력한 영상의 모니터의 색과 비교하였을 때 더 작은 색차를 나타내었다.