Yindeesuk, Witoon
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Preferred name
Yindeesuk, Witoon
Alternative Name
Yindeesuk, W.
Main Affiliation
Email
witoon.yi@kmitl.ac.th
9 results
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Item type:Publication, Rhodamine 6G and Au–Pd core–shell nanorods: Fluorescence enhancement for detection of mercury(2018-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Growth stage detection for food consumption management in smart cricket farming using a deep learning technique(2025-11-01); ; ; This research proposed a novel method for tracking and predicting the growth stages of two-spotted crickets, reared in a temperature-controlled box at different growth stages using the YOLOv5s model. The images of crickets feeding inside the rearing box were taken with an infrared camera above the feeding point every hour. Images of the cricket were used to train a YOLOv5s model to detect crickets for each growth stage in the rearing box. The experimental results showed that the trained deep learning had an average accuracy of 95.7%. The relationship between the ratio of crickets at each growth stage throughout the 45-day rearing period was plotted and discussed. The results also showed a clear relationship between the amount of food consumed by crickets per day and their growth stage, which could be useful for appropriately managing food consumption according to the growth stage of crickets. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Growth and characterization of novel optoelectronic materials. Based on II-VI inorganic/organic heterostructures(2006-01-01); ; ; Novel optoelectronic materials based on II-VI inorganic/organic low-dimensional heterostructure were successfully grown by electron beam evaporator. The structures were based on ZnSe, tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>) and N,N'-bis(3-methylphenyl)-N,N'-diphenyl-benzidine (TPD). The surface morphology of the structures was investigated by atomic force microscopy and field emission scanning electron microscope. The optical and electronic properties were examined by photoluminescence, photocurrent and electroreflectance spectroscopy. Photoluminescence spectra of the ZnSe/Alq <inf>3</inf>/ZnSe structure attributed to the change of exciton energy as a result of quantum confinement showed the formation of single quantum well structure. The luminescence color can be varied by changing the thickness of the Alq<inf>3</inf> layer. The other heterostructure of ZnSe/Alq<inf>3</inf>/TPD was grown on silicon substrate. The wavelength response of this structure shown by photocurrent signal ranged from 450 nm to 1100 nm. Electroreflectance features due to optical transition energy of the single quantum well of this structure were also observed. Under applied voltage, electroreflectance signals showed significant shift due to the quantum confined Stark effect. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electroreflectance and photocurrent measurement of ZnSe/Alq 3/TPD heterostructure on Si-substrate(2005-11-20); ; ; The optical transition energy in ZnSe/tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>)/N,N′-bis(3-methylphenyl)-N,N′-diphenyl-benzidine (TPD) heterostructure were investigated by room-temperature electroreflectance (ER) and photocurrent (PC) measurements. PC signal showed wavelength response of the device in the range of 450-1100 nm. ER features due to optical transition energy of the single quantum well of this structure were observed. The transition energies were determined by fitting the ER spectra to the theoretical line-shape expression. The subband transition energy decreased with increasing well thickness. Under applied voltage, both ER signals show significant shift due to the quantum confined Stark effect. © 2005 Elsevier B.V. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison of Interferometry Applications: Michelson vs. Sagnac Interferometers(2025-05-14); An interferometer is a crucial instrument for collecting information on interference patterns, widely used in both scientific and industrial applications. This paper was focused on comparing the interferometric applications of the Michelson and Sagnac interferometers. The Michelson interferometer, characterized by its double-path setup, and the Sagnac interferometer, which operates on a common-path principle, were analyzed. Experiments were conducted to capture interference patterns of different samples using both interferometers. In the first experiment, the image fringes of the alphabet characters (K, M, I, T, and L) were captured, while in the second, fingerprint patterns were captured. The results showed that both interferometers produced similar fringes for the alphabet characters, although the Sagnac interferometer exhibited a higher circular frequency. In the fingerprint experiment, the Michelson interferometer produced linear fringes. This study highlights the distinct fringe patterns generated by each interferometer when different samples are analyzed, providing valuable insights into their diverse applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The Effect of PbS Colloidal Quantum Dots with CdS and ZnS Coating on Photovoltaic Properties(2023-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Enhancement of backward third-harmonic generation in a one-dimensional PIM/NIM periodic structure(2018-09-01); A numerical simulation is reported for backward third-harmonic generation (BTHG) in a one-dimensional periodic structure containing a stack composed of positive-index material (PIM) and negative-index material (NIM). A multiple-scale method is used to formulate a completed set of coupled-mode equations with inhomogeneous higher-order nonlinear terms for both electric and magnetic fields. The coupled equations are numerically solved to simulate output third-harmonic frequency pulses and their conversion efficiencies by a fast Fourier transform–pulse propagation method. Finally, the numerical results validate the idea that using a combination of the negative-index phase-matched condition, which is created by engineering the dispersive property of the NIM layer, and local field enhancement, which is created by arranging PIM and NIM layers in an optimal periodic fashion, yields a dramatic enhancement of BTHG conversion efficiency. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DEVELOPMENT AND EXPERIMENTAL CHARACTERIZATION OF AN IOT-CONTROLLED RGB LED LIGHTING SYSTEM FOR HYDROPONIC APPLICATIONS(2026-01-01); ; ; This study presents the development of an Internet of Things-based RGB LED lighting system for precise, flexible light control in hydroponic plants. The system consists of 480 high-power RGB LEDs controlled by an ESP8266 microcontroller, enabling real-time adjustment of light intensity, photoperiod, and color ratios via a smartphone. Pulse-width modulation duty-cycle modulation enables the generation of white light suitable for different stages of plant growth. Experimental results show a linear correlation between illuminance and duty cycle for all color channels. Spectral analysis confirms stable emission within the photosynthetically active radiation range (400–700 nm), with the spectral composition remaining unchanged even when brightness is reduced (dimming). The system demonstrates high control accuracy and adaptability for regulating plant growth lighting, particularly for leafy vegetables such as lettuce. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Studies of concentration dependence of the fluorescent quantum yield from rhodamine 6G and Au–Pd core–shell nanorods, using a response surface methodology(2017-01-01); ; We have applied a response surface approach to study the fluorescence quantum yield (FQY) of rhodamine 6G (Rh6G) mixed with Au–Pd core–shell nanorods (Au–Pd NRs). The FQYs have been measured for the Rh6G concentrations varying from 3.53×10<sup>–7</sup> to 1.70×10<sup>–6</sup> mol/L and the concentrations of Au–Pd NRs from 7.06×10<sup>–6</sup> to 1.36×10<sup>–4</sup> mol/L. Our experimental results testify that the FQY depends notably on the proportions of Rh6G and Au–Pd NRs. A specific relationship between the FQY and the concentrations has also been confirmed by a response surface plot. It is found that the discrepancy between the experiment and the calculations is less than 2%.