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Development of Deep Learning Color Recognition Model for Color Measurement Processes
Lee Sanghun,Kim Ki-Sub,Kang Jeong Won 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
We present a deep learning color recognition model for the color measurement process in the paint industry. Currently, spectrophotometers are primarily used for color measurements owing to their accuracy. The measurement method involves manually injecting the sample into a spectrophotometer. Our proposed method uses a webcam with a deep learning model on the stand of a spectrophotometer. Deep learning models are widely used for image and color detection. In this study, the “you only look once (YOLO)” algorithm is applied for real-time detection of color samples. Upon training various sample images using YOLO, the model could detect the sample area in real time using a webcam. An open source computer vision (OpenCV) library was used for the color recognition model, and the detected RGB color value was converted to the international commission on illumination color space (CIELAB) value, which is primarily used in the color measuring process. However, because of the mirror-like refl ection of light from a surface with specular refl ection, it is diffi cult to implement the color value using a camera. To address this problem, we compare several specular removal methods and propose the most suitable model for the color recognition model of color samples. The accuracy of the proposed model was verifi ed by comparing the colors of various samples. Our proposed approach can easily detect samples and color values, which can contribute signifi cantly to automatically calculating the exact amount of coloring required for the target color.
Some Features of Dye-sensitized Solar Cell Combining with Single-walled Carbon Nanotubes
Lee, Sanghun,Park, Hyunjune,Park, Taehee,Lee, Jongtaek,Yi, Whikun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A dye-sensitized solar cell (DSSC) was fabricated with a nanocrystalline $TiO_2$ film electrode on FTO glass, N719 dye, electrolytes (or $CsSnI_3$), and counter Pt electrode by incorporating it with single-walled carbon nanotubes (SWNTs). SWNTs were combined with $TiO_2$ film, $CsSnI_3$, Pt electrode, separately, and the SWNT-containing cell was compared with a pristine cell in cell performance. We also examined the performance change by pressing $TiO_2$ film, during cell fabrication, inside a high pressure chamber. Mostly, the change of conversion efficiency was compared for each cell, and an atomic force microscopy data were suggested to explain our results.
Detecting defects in concrete structures using accumulated SIBIE
Lee, Sanghun,Endo, Takao,Ishida, Hiroki 한국방재학회 2015 한국방재학회 학술발표대회논문집 Vol.14 No.-
Images created by stack imaging spectral amplitudes based on the impact-echo (SIBIE) method are largely one-dimensional because a single frequency domain spectrum for waves reflected below a single point of impact is used to create them. The method has limitations for representing defects in a cross section of a concrete structural element using two-dimensional coordinates. This study focused on defect detection and visualization in a concrete structural element using multiple impacts and accumulated SIBIE. An impactor was used to induce energy at multiple points positioned at prescribed intervals along the structural element. A modified SIBIE method was applied to the collected data for each point and the modified SIBIE images were accumulated to generate one image (an accumulated SIBIE image). As a result, the defect positions could be represented in the cross section of the structural element using a two-dimensional coordinate system. And the method appears to improve upon existing methods to detect voids or other defects in concrete.
Sanghun Lee,Sunhwan Jang,Cam Nguyen,Dae-Hyun Choi,Jusung Kim 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.4
In this paper, we integrate a divide-by-3 injection-locked frequency divider (ILFD) in CMOS technology with a 0.18-μm BiCMOS process. We propose a self-injection technique that utilizes harmonic conversion to improve the locking range, phase-noise, and input sensitivity simultaneously. The proposed self-injection technique consists of an oddto-even harmonic converter and a feedback amplifier. This technique offers the advantage of increasing the injection efficiency at even harmonics and thus realizes the low-power implementation of an oddorder division ILFD. The measurement results using the proposed self-injection technique show that the locking range is increased by 47.8% and the phase noise is reduced by 14.7 dBc/Hz at 1-MHz offset frequency with the injection power of -12 dBm. The designed divide-by-3 ILFD occupies 0.048 mm² with a power consumption of 18.2-mW from a 1.8-V power supply.
Sanghun Lee,,차병진 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.2
Periwinkle seedlings (Cantharanthus roseus) were inoculated with jujube witches’- broom (JWB) phytoplasma via grafting to analyze the migration of JWB phytoplasmas within the host plant. The phytoplasmas were detected using nested polymerase chain reaction (PCR)and fluorescence microscopy. Fluorescence microscopy was a simple and easy method of detecting phytoplasmas;however, it was not sufficiently sensitive to detect very low phytoplasma concentrations. Therefore, the migration of JWB phytoplasma was investigated through PCR. The first migration of JWB phytoplasma from an infected tissue to healthy tissues occurred late. After grafting, the phytoplasmas moved from the inoculated twig (or scion) to the main stem, which took 28 days. Afterward, the phytoplasma migrated faster and took less than 4 days to spread into the roots from the main stem. All twigs were then successively colonized by the JWB phytoplasmas from the bottom to the top. JWB phytoplasma was detected via nested PCR in all parts of the periwinkle seedling 82 days after inoculation. Based on these results, the inoculated JWB phytoplasma appeared to migrate downward to the roots along the main stem during the early stages, and then continued to move upward, colonizing twigs along the way until they reached the apex.
Effect of Subsurface Drainage Systems on Soil Salinity at Saemangeum Reclaimed Tidal Land
Sanghun Lee,Hui-Su Bae,Soo-Hwan Lee,Yang-Yeol Oh,Jin-Hee Ryu,Jong-Cheol Ko,Ha-Chul Hong,Yong-Doo Kim,Sun-Lim Kim 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6
Soil salinity is the most critical factor for crop production at reclaimed tidal saline soil. Subsurface drainage system is recognized as a powerful tool for the process of desalinization in saline soil. The objective of this study was to investigate the effects of subsurface drainage systems on soil salinity and corn development at Saemangeum reclaimed tidal saline soil. The field experiments were carried out between 2012 and 2014 at Saemangeum reclaimed tidal land, Buan, Korea. Subsurface drainage was installed with four treatments: 1) drain spacing of 5 m, 2) drain spacing 10 m, 3) double layer with drain spacing 5 m and 10 m, and 4) the control without any treatment. The levels of water table showed shorter periods above 60 cm levels with the deeper installation of subsurface drainage system. Water soluble cations were significantly greater than exchangeable forms and soluble Na contents, especially in surface layer, were greatly reduced with the installation of subsurface drainage system. Subsurface drainage system improved biomass yield of corn and withering rate. Thus, the biomass yield of corn was improved and the shoot growth was more affected by salinity than was the root growth. The efficiency of double layer was not significant compared with the drain spacing of 5 m. The economic return to growers at reclaimed tidal saline soil was the greatest by the subsurface drainage system with 5 m drain spacing. Our results demonstrated that the installation of subsurface drainage system with drain space of 5 m spacing would be a best management practice to control soil salinity and corn development at Saemangeum reclaimed tidal saline soil.