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Growth and quality of Ethiopian peppers grafted on Korean peppers
도윤선,사무엘 틸라훈 아세파,배도함 한국국제농업개발학회 2020 韓國國際農業開發學會誌 Vol.32 No.1
Vegetable grafting is a century-old technique used in Asia in order to enhance plant production, including reduction in disease susceptibility and increase in plant vigor. Nevertheless, in Africa (Ethiopia), vegetable grafting is rarely existent. Vegetables are among the major agricultural crops in Ethiopia, and pepper is one of the most important vegetable crops cultivated in the country. However, both biotic and abiotic factors limit pepper productivity, keeping it very low. Hence, this study investigates grafting methods and the impact of grafting on growth and quality of two Ethiopian pepper varieties (Mareko Fana and Melka Zala) grafted on two commercial Korean rootstocks varieties. Both Ethiopian varieties showed 100% grafting union success with the Korean varieties when wedge grafting method was used, while the splice grafting method resulted in lesser success. Furthermore, grafting the Mareko Fana variety on PR3 resulted in statistically significant higher yield compared to the control, while the yield of the Melka Zala was reduced when grafted on PR3. On the other hand, fruit diameter and fruit length of the Ethiopian pepper was not significantly affected by the rootstocks. Finally, grafting was found to increase the TSS content of the Mareko Fana variety. This study documented the standardization of grafting methods and grafting effects on growth and quality traits of pepper under greenhouse conditions. The results of this study will be indispensable for the beginning of the grafting technology in Ethiopia.
복합 플라즈몬 구조에서의 개별 모드 동작을 이용한 플라즈모닉 컬러 필터 최적의 설계 방법
이용호,도윤선 한국광학회 2018 한국광학회지 Vol.29 No.6
In this study we propose a hybrid color-filter design method in which a nanohole array and a nanodisk array are separated by nanopillars of the material AZ 1500. We propose a design method for an RGB color filter, using the tendency of transmitted light according to each design variable. Especially we analyzed the intensity distribution of the electric field in the cross section, and set the height of the nanopillars so that the local surface-plasmon resonances generated in the two different arrays do not affect each other. The optical characteristics of the optimized color filter are as follows: In the case of the red filter, the ratio of the wavelength band expressing red in the visible broadband is 55.01%, and the maximum transmittance is 41.53%. In the case of the green filter, the ratio of the wavelength band expressing green is 40.20%, and the maximum transmittance is 42.41%. In the case of the blue filter, the ratio of the wavelength band expressing blue is 32.78%, and the maximum transmittance is 30.27%. We expect to improve the characteristics of color filters integrated in industrial devices by this study.
입사광각의 영향을 최소화한 다결정 주기 구멍 배열 플라즈모닉 컬러 필터의 설계
정기원,도윤선 한국광학회 2020 한국광학회지 Vol.31 No.3
In this paper we propose a plasmonic color filter with a novel nanopattern. The suggested pattern, called a “polyperiodic hole array” (PPHA), is introduced to solve the angle dependence of the optical response that originates from the periodic structure. We set the diameter and period of the hole to make a green color filter, and set the unit-cell size and metal and dielectric thicknesses in consideration of the propagation length and skin depth. The periodic hole arrays are locally rotated to make a PPHA pattern, resulting in a globally aperiodic yet partially periodic pattern. As a result, compared to a general pattern, the PPHA nanostructured color filter has a maximum 40% improvement in spectral shift when the angle of incidence is increased from 0° to 30°. Transmittance reduction was also alleviated by 30%. This work will improve the performance of nanostructured color filters and help with nanotechnology being applied industrially to imaging devices, including displays and image sensors.
Plasmonic Color Filter with Robustness Against Cross Talk for Compact Imaging Applications
조효종,도윤선 한국광학회 2020 Current Optics and Photonics Vol.4 No.1
In high resolution imaging devices, smaller aperture in the color filter causes cross talk which provides incorrect information. Plasmonic color filters (PCFs) have been reported as an alternative of the conventional color resist based-color filter (CRCF) and many studies on PCFs demonstrated the filtering function by PCFs with a sub-micron size. In this work, we investigated the cross talk performance of PCFs compared to CRCFs. The effect of cross talk over distance from the filter were measured for each filter. Despite poorer spectral filtering characteristics, PCFs were more robust against cross talk than CRCFs. Also, the further away from the filter, the more cross talk appeared. As a result, PCFs showed less cross talk than CRCFs at about 82% of the results measured at a distance of 2~10 µm. This study will help to make practical use of PCFs in high-resolution imaging applications.
평판형 태양 전지의 광학 및 전기적 특성 최적화를 위한 에미터 전극 설계 연구
이상복,도윤선 한국광학회 2020 한국광학회지 Vol.31 No.1
본 연구에서는 기본적인 평면 태양 전지 구조에 1차원 주기를 가지는 에미터 전극 배치를 통해 광학 및 전기적 효율을 최적화 하는 설계방법을 제안한다. 에미터 전극의 주기가 줄어들면 애퍼처 비율이 감소해 빛 흡수율이 줄어들어 태양 전지 성능 저하에 영향을 끼친다. 본 연구에서는 시뮬레이션을 통해 가장 간단한 평판형 태양 전지 구조 내에서 에미터 전극 배열의 최적안을 제시 하였다. 광학적 측면에서 에미터 전극이 없이 광흡수층 전면에서의 광흡수를 하는 레퍼런스 소자와 성능이 유사한 조건을 도출했 다. 그리고 광흡수 및 전기적 효율 측면을 모두 고려하여 가장 효과적인 전극 구조를 제안하였다. 본 연구 결과는 광전 변환으로 생성된 전하를 전극으로 가장 효율적으로 전달할 수 있는 구조를 제안함으로써, 대체 에너지원에서 큰 비중을 차지하고 있는 태양 전지의 활용성을 높이는데 기여할 것이다.
Dual Fabry-Perot Interferometer to Improve the Color Purity of Displays
신근수,김준용,도윤선 한국광학회 2023 Current Optics and Photonics Vol.7 No.2
We propose a dual Fabry-Perot interferometer (DFPI) structure that combines two Fabry-Perot interferometers. The structure is designed to have spectral peaks in the red, green, and blue regions simultaneously, to be applicable to R, G, and B subpixels without any patterning process. The optimized structure has been fabricated on a glass substrate using a thermal evaporation technique. When the DFPI structure was attached to the quantum-dot color-conversion layer, the full width at half maximum values of the green and red spectra decreased by 47.29% and 51.07% respectively. According to CIE 1931 color space, the DFPI showed a 37.66% wider color gamut than the standard RGB color coordinate. Thus it was experimentally proven that the proposed DFPI structure improved color purity. This DFPI structure will be useful in realizing a display with high color purity.
금속-유기 구조체를 이용한 포토닉 크리스탈 기반의 효율적인 습도 컬러 센서
김준용,이성학,도윤선 한국광학회 2018 한국광학회지 Vol.29 No.6
In this study we suggest a humidity-sensitive color sensor using a one-dimensional photonic crystal and Hong Kong University of Science and Technology-1 (HKUST-1), which is a metal-organic framework (MOF) substance. One-dimensional photonic crystals have a photonic band gap, due to a periodic refractive-index change, and block and reflect light components in a specific wavelength band. The refractive index of HKUST-1 differs in dry and humid environments. Herein we designed a sensor using the presence of the photonic band gap, with FDTD simulation. As a result of optical analysis, the color conversion of the reflected light was superior to the color conversion of the transmitted light. When the center wavelength of the photonic band gap was 550 nm, the maximum peak value of the wet environment increased by a factor of about 9.5 compared to the dry environment, and the color conversion from achromatic to green was excellent as a sensor. The results of this study suggest the application of MOF materials to moisture sensors, and the nanostructure design of MOF materials will expand the applications to industrial devices.