• 한국자원식물학회지
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• 제36권3호
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• pp.237-255
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• 2023

Variations in phenotypic traits are important for onion genetic improvement. The aim of this study was to identify the phenotypic traits of temporary genetic resources and the best accessions for the development of onion breeding programs. Sixteen phenotypic traits of 79 onion accessions were studied. The descriptive statistics of phenotypic traits exhibited a high variation in onion accessions. Among the 79 evaluated accessions, 64.55% had a large bulb neck width and 44.30% had a circular bulb shape. Principal component analysis showed that six principal components (PCs) accounted for 72.65% of the total variation. The main factors contributing to PC1 were bulb weight, equatorial and bulb polar diameters, plant height, and degree of splitting into bulblets, whereas those contributing to PC2 were the bulb color of the epidermal cells of the fleshy scales and color of the dry skin on the bulb. The accessions were classified into three groups-clusters 1, 2, and 3. Cluster 2 accessions were the most suitable for selecting large and circular bulb-shaped onion cultivars. The phenotypic variation observed in this study may help to select potential accessions for breeding new onion cultivars.

• 한국정보과학회논문지:소프트웨어및응용
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• 제29권12호
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• pp.940-946
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• 2002

본 논문에서는 변형된 칼라 코렐로그램(Color Correlogram)을 이용한 영상검색 방법을 제안한다. 제안한 방법은 영상 내의 같은 칼라를 가지는 영역의 크기 변화에 강인하게 영상을 검색하기 위해, 영상에서 얻어진 칼라 코렐로그램의 오토-코렐로그램(auto-correlogram)과 크로스-코렐로그램(cross-correlogram) 영역을 각각 정규화하여 변형된 칼라 코렐로그램을 얻는다. 그리고 영상검색을 위한 유사도 측정시, 오토-코렐로그램에 가중치를 크로스-코렐로그램 영역보다 작게 준다. 제안한 방법은 칼라 코렐로그램의 정보를 효과적으로 사용함으로써, 영상검색 성능을 높일 수 있다. 실험을 통해 제안한 방법이 기존의 칼라 코렐로그램을 이용한 방법보다 효과적으로 영상을 검색할 수 있음을 확인하였다.

• 한국잠사곤충학회지
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• 제39권1호
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• pp.22-29
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• 1997

Ultraviolet weavelength (UV) of 366 nm produced clearer fluorescent dolor than that of 254 nm for the inspection of silkworm cocoons. Fluorescent color of silkworm cocoons varied in color, appears no relationship with the natural color under the normal light. Uniformity of fluorescent color was improved by selection of blue or yellow line from wild types. Blue and yellow, located at the opposite poles on the color solid and L*a*b* color system, confirmed as pure standard of fluorescent color in the silkworm races for commercial white cocoons. the cocoons with blue fluorescence occupied as high as 1.7 to 8.6 times than those with yellow in the Japanese silkworm races. Fluorescence of silkworm cocoon was not affected by forced flow dry at 70$^{\circ}C$ for 6 hrs. While the Japanese races revealed no sexual difference in fluorescent color, sex-dependence of the color was common in the Chinese races for commercial white cocoon. The fluorescence of cocoon shell of Chinese races showed clear separation of blue of median color. Silkworm strain of Dc20 and Fc24 were sexualy segregated 98.8${\pm}$1.20%, 99.0${\pm}$1.00% by cocoon fluorescence, as that of 99.3${\pm}$0.44% by typical larval marking of sex-limited inheritance. Specific expression of cocoon fluorescence, applicable to breeding of simple discrimination of sex for Chinese races, inspected thoroughly on the surface and inner layer of cocoon shell.

• Journal of Electrical Engineering and Technology
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• 제13권4호
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• pp.1673-1681
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• 2018

In this paper, the fabrication of a white light-emitting diode (WLED) package capable of producing different color rendering indexes (CRI ($R_a$)) using different types of phosphors (YAG:Ce, Silicate, Nitride, LuAG) for the LEDs is presented. The color quality is evaluated based on the current and temperature variation conditions. The evaluation method for color quality compares the existing CIE 13.3 method and the new IES TM-30-15 method. The CRI ($R_a$) defined in the conventional CIE 13.3 has the disadvantage. This cannot offer any information relevant to the user's preference. However, the newly proposed IES TM-30-15 method suggests the additional measure related to user's preference such as Color Gamut ($R_g$). The present experimental results obtained using the IES TM-30-15 show that the color quality of the WLEDs using green and red phosphors are better than that of the WLEDs using yellow phosphor, but their luminous efficacies are lower. The color quality of WLEDs using green and red phosphors are more stable than that of the WLEDs using yellow phosphor, for current and temperature variations, and it is verified that the phosphor causes this change. The evaluation method for color quality, based on IES TM-30-15, is proved to be capable of overcoming the problems of the existing evaluation methods by this study.

• 조명전기설비학회논문지
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• 제27권12호
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• pp.16-27
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• 2013

This study describes the difference of lighting directing techniques of between asian and westerner in the residential space, and presents the LED lighting environment according to the residents' behaviors. This study was conducted with Koreans, European and North Americans, and the space range was limited to the living room where the various activities occur. The data of the desired LED lighting environment is drawn through lighting technique, illumination color temperature and illuminance variation of LED in living room, and the detailed study results are as follows ; First, the lighting in living space should be made with considering the various behaviors because the expected level according to consideration or not of behavior makes much difference. Second, the comfortably feeling LED lighting environments that are lighting technique, illumination color temperature and illuminance variation, are different between Koreans and North Americans, but Koreans and European feel comfortable under the similar LED lighting environments. Third, the data for the comfortable LED lighting environments is established according to the various residents' behaviors, which are watching TV, reading, studying, relaxing, chatting, entertaining guests. And then, the established LED lighting environments are analyzed with characteristic of behavior and classified according to lighting technique, illumination color temperature and illuminance variation for understanding their characteristic Few studies have been conducted to find out difference of the comfortably feeling LED lighting environment between asians and westerners. Therefore, in this study, it has a great significance to present the difference of the LED lighting environments that asians and westerners feel comfortable in living space, and to draw the characteristic of the expected lighting environment according to residents' behaviors.

• 한국컴퓨터정보학회논문지
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• 제12권4호
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• pp.53-59
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• 2007

저 사양 HMD(Head Mounted Display)를 사용하는 가상 환경 네비게이션 시스템은 true-color 이미지를 제한 된 색으로 표현 할 때 이미지를 양자화 해야 한다. 그러한 시스템은 고정된 팔래트를 이용하여 이미지를 양자화 한다. 인간의 눈은 시선부분의 색변화에 민감하기 때문에 시선부분의 색을 고려하여 동적으로 팔래트를 생성하고 이를 이용하여 이미지를 양자화 한다면 사용자는 가상 환경을 보다 생동감 있게 느낄 수 있다. 본 논문에서는 사용자가 가상환경을 보다 생동감 있게 느끼게 하기 위한 컬러 양자화 방법을 제안하고 제안 방법을 이용하여 가상환경 네비게이션 시스템을 구성하였다. 네비게이션 시스템은 사용자의 시선이 변할 때 마다 이미지를 양자화 하여 HMD를 통해 사용자에게 양자화된 이미지를 보여준다. 본 논문에서는 제안 방법을 이용한 시스템의 선호도를 조사 하였으며 대부분의 사용자가 제안 방법을 이용한 시스템을 선호 하였다.

• 한국작물학회지
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• 제58권4호
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• pp.408-415
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• 2013

본 연구는 동아시아 및 동남아시아에서 수집한 들깨, 차조기 그리고 이들 잡초형 계통들에 대하여 10개의 양적 및 질적 형질들을 이용하여 형태적 변이성을 조사하였다. 그 결과 분석에 이용된 형질들 중에서 종자크기와 종자경도는 재배형 들깨와 재배형 차조기 그리고 들깨의 재배형과 잡초형 계통들을 식별하는 유용한 형질로 밝혀졌으며, 반면에 재배형 및 잡초형 차조기의 계통들은 조사한 대부분의 형질들에서 뚜렷한 차이를 나타내지 않았다. 주성분분석 결과에서 분석에 이용된 10개의 형질들 중에서 꽃색(QL6), 엽표면색(QL3), 종자크기(QN2), 종자경도(QL1), 종자색(QL2), 줄기색(QL7), 엽이면색(QL4) 등은 1축 위에서 음의 방향에 기여하였고, 개화일수(QN1)와 잎모양(QL5), 모용빈도(QL8) 등은 1축 위에서 양의 방향에 기여하였다. 특히, 이들 형질들 중에서 꽃색(QL6), 엽표면색(QL3), 종자크기(QN2), 종자경도(QL1) 그리고 모용빈도(QL8) 등은 들깨 재배형와 차조기의 재배형 그리고 들깨의 재배형 및 잡초형 계통들을 식별하는데 유용한 형질들이었다. 그러나 차조기의 재배형 및 잡초형 계통들은 대부분의 형질들에서 명확하게 구분되지가 않았다. 아직까지 동아시아 및 동남아시아에서 들깨와 차조기의 야생종은 알려져 있지는 않지만, 들깨와 차조기 작물의 잡초형 계통들은 재배형 들깨와 재배형 차조기 작물의 기원을 이해하는데 분류학적으로 중요한 위치에 있는 것으로 생각된다.

• 천문학회보
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• 제14권
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• pp.13.3-14
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• 1989

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 한국컴퓨터종합학술대회 논문집 Vol.33 No.1 (B)
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• pp.388-390
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• 2006

This paper presents an object tracking with radical change of color. Conventional Mean Shift do not provide appropriate result when major color distribution disappear. Our tracking approach is based on Mean Shift as basic tracking method. However we propose tracking algorithm that shows good results for an object of radical variation. The key idea is iterative update previous color information of an object that shows different color by using EM algorithm. As experiment results, we show that our proposed algorithm is an effective approach in tracking for a real object include an object having radical change of color.

• 한국인쇄학회:학술대회논문집
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• 한국인쇄학회 2000년도 춘계 학술발표회 논문집
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• pp.17-24
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• 2000

The Joint Photographic Experts Group (JPEG) is a standara still-image compression technique, established by the International for Standardization (ISO) and International Telecommunication Standardization Sector (ITUT). The standard is intended to be utilized in the various kinds of color still imaging systems as a standard color image coding format. Because JPEG is a lossy compression, the decompressed image pixel values are nto the same as values before compression. Image of JPEG compression is often made to JPEG recompression at saving to apply JPEG compression of color image. In general, JPEG is a lossy compression and compression image is predicted to be varied image quality according to recompressed Q-factor. Various distortions of JPEG compression and JPEG recompression has been reported in previous paper. In this paper, we compress four difference color samples (photo image, gradient image, vector drawing image, text image) according to various Q-factor, and then compressed images are recompressed according to various Q-factor once again. As the results, we inspect variation of quality and file size of recompressed color image, and ensure the optimum recompression factor.