Tooprakai, Sirapop

Preferred name

Tooprakai, Sirapop

Alternative Name

Tooprakai, Siraphop

Main Affiliation

School of Engineering

sirapop.to@kmitl.ac.th

Now showing 1 - 10 of 14

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Current-Mode Active Filter Using EX-CCCII
(2024-06-01)
Kumngern, Montree
;
Khateb, Fabian
;
Kulej, Tomasz
;
Tooprakai, Siraphop
This paper presents a novel multiple-input and multiple-output current-mode universal analog filter with electronic tuning capability. The proposed circuit uses a single second-generation current-controlled current conveyor with extra-X terminals (EX-CCCII) and two grounded capacitors. The filter can offer five standard filtering functions, namely low-pass, high-pass, band-pass, band-stop, all-pass responses, in the same circuit without changing the internal configuration of the filter by selecting appropriate input and output signals. To obtain the five standard filtering functions, inverted input signal and input matching conditions are absent. The natural frequency of all filter responses can be electronically controlled. The proposed circuit was simulated by SPICE using 0.18 μm CMOS process from Taiwan Semiconductor Manufacturing Company (TSMC). The results of experiments using the integrated circuit operational amplifier AD844 confirm the functionality of the new filter.
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Efficient Processing Time with Carry-lookahead Adder Memristor Rationed Logic
(2023-01-01)
Yamtim, Suparlerk
;
Tooprakai, Siraphop
This paper presents a novel approach to the design of full adder circuits, leveraging the unique properties of memristors and CMOS logic in a hybrid system. This paper explores the design and operation of memristor-based logic gates, including AND, OR, NAND, and NOR gates, realized through CMOS inverters. This paper further proposes a full adder circuit using Hybrid Memristor-CMOS logic and a carry look-Ahead adder (CLA). Our simulations demonstrate that the proposed full adder circuit outperforms traditional RCA-based circuits in terms of speed. This work contributes to the ongoing discourse in digital electronics, offering fresh perspectives and potential solutions to existing challenges, and hope it will inspire further research in the field of memristor-based digital electronics.
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Multi-input Memristor Rationed Logic Full Adder Circuit for Efficient Processing Time
(2022-01-01)
Yamtim, Suparlerk
;
Tooprakai, Siraphop
This research proposes a multi-input memristor rationed logic (MRL) 1-bit full adder circuit as an alternative to conventional multi-stage MRL full adders. The proposed multi-input 1-bit full adder circuit consisted of 25 memristors without CMOS transistor. Ripple carry adder was utilized to realize multi-input MRL 8-bit full adder circuit by cascading eight blocks of multi-input MRL 1-bit full adder. The advantages of the multi-input MRL 8-bit full adder include straightforwardness, compactness, and improved delay time. Simulations were carried out by using LTspice simulator and results compared with multi-stage full adders. The multi-input MRL 8-bit full adder circuit achieved higher processing-time efficiency and thereby holds great potential as an alternative to multi-stage full adders. The novelty of this research lies in the use of multi-input MRL technique to realize full adder circuits that effectively mitigate voltage degradation and improve delay time.
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Estimation of Protection Distance between Digital TV Signals in Adjacent Channel on Terrestrial Television
(2025-01-01)
Chomsuk, Kinupong
;
Tooprakai, Siraphop
The Office of the National Broadcasting and Telecommunication Commission (NBTC) of Thailand initiated the transition to digital broadcasting. The implementation process requires a broadcasting license and digital transmission testing, which was carried out on channel 29 and channel 30 - adjacent channels. Due to the 20 MHz spacing between these signals, adjacent channel interference is inevitable. This study experimentally evaluates the degradation caused by interference between digital television signals operating on adjacent channels in terrestrial television broadcasting.A novel aspect of this research is the use of field strength measurements to assess the impact of adjacent channel interference on digital TV signals within urban areas. The results demonstrate that most measured protection ratios (PR) align with the ITU-R recommended value of -11 dB. This confirms that the power ratio is affected by spectrum overlap rather than the distance from the trasmitter station.
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Maintenance Decision Modeling for Solar Photovoltaic Performance Prediction Using RMSE and MAPE Methods
(2025-01-01)
Aree, Sompong
;
Tooprakai, Siraphop
This study evaluates the efficiency and degradation of a 999.50 kWp photovoltaic (PV) system in Thailand under clear sky conditions. It found that the system efficiency ratio significantly decreased, 10% below the design threshold. Thus, a feasible and optimal model can be identified to support better maintenance decisions. In addition, a real-time performance monitoring approach is proposed to enable building operators to make informed decisions about mechanical maintenance or cleaning maintenance. This method involves comparing the actual power generation data with the efficiency prediction based on linear regression modeling. In addition, the impact of dirt accumulation on the efficiency of the PV modules is evaluated. The preliminary results indicate that the output power decreases to 213.74 kW, and the corresponding efficiency ratio is 46.76%. A linear regression-based warning mechanism is adopted to issue an alarm when the efficiency drops below a threshold of 50% ± 10 or when the power drops below 300 kW ± 50. The results show that using this prediction approach can improve the system efficiency ratio by up to 70% and increase the output power by more than 355.53 kW. The accuracy of the model is verified with a mean square error(RMSE) of 18.86% or more than 81.14% and a mean absolute percentage error(MAPE) of 4.56%. The study concludes that the prediction simulation can effectively guide maintenance interventions, which can improve both power generation and system efficiency. Future work may incorporate AI-driven predictive analysis to further optimize the PV system and maintenance strategies.
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Recognition of Marijuana Plant Leaf Diseases Based on Deep Learning
(2025-01-01)
Kong, Qingye
;
Tooprakai, Siraphop
Plant pests and diseases are a common problem in agricultural production, and if not handled properly, they can seriously affect crop yield and quality. The era of the Internet of Things has arrived, and modern monitoring methods have also been applied to the growth monitoring of some crops, achieving good results. However, the cultivation of marijuana still relies mainly on traditional manual monitoring and modern methods have not yet been widely used. At the same time, the prevention of diseases and pests in marijuana is the focus, and if problems are not detected early, the losses can often be severe. This article proposes using machine learning to screen for abnormal leaves and confirm whether the leaves are healthy. After repeated training, the system can compare and classify different images of marijuana leaves and identify abnormal parts. The system is designed based on Python. The test results indicate that this technology can be applied to distinguish marijuana leaves to ensure early detection of diseases and pests, and to minimize agricultural losses caused by untimely remedial measures.
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Development of wireless device prototype for measurement of rumen pH and temperature continuously in cattle
(2023-01-01)
Prasomsri, Piyanat
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Tudsorn, Apirak
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Leklerdsiriwong, Aekaluck
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Inchaisri, Chaidate
;
Tooprakai, Siraphop
This study aims to develop a prototype rumen pH and rumen temperature measuring device for continuous measurement. The benefit is for the monitoring and early diagnosis of metabolic diseases in cattle, especially rumen acidosis and subacute ruminal acidosis. The developed prototype device was approximately 50 millimeters in diameter, 145 millimeters in length and weighed 400 grams. The outer structure of the prototype was made from abs plastic made by a 3D printer, while the internal device contained pH and temperature sensors, a microcontroller and battery. The prototype was placed in the ventral sac of the rumen of fistulated cattle for three days to test the transfer of pH and temperature data. It was found that the pH drifted over time while the temperature remained stable. The pH and temperature signals showed a fast response after feeding. The rumen pH and rumen temperature measured with the prototype were 5.3 - 7.0 and 37.25 - 38.75, respectively. The pH drift over 48 and 72 hours was around 0.15 and 0.28, respectively.
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0.3 v Fully Differential Current Conveyor Using MIBD-DT MOST technique
(2022-01-01)
Kumngern, Montree
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Torteanchai, Usa
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Wongprommoon, Natapong
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Jongchanachavawat, Wirote
;
Tooprakai, Siraphop
This paper presents a new fully differential second-generation current conveyor (FDCCII) using multiple-input bulk-driven dynamic threshold voltage MOS transistor (MIBD-DT MOST) technique. This FDCCII, the MOST techniques such as the multiple-input (MI), bulk-driven (BD) and dynamic threshold voltage (DT) have been used. The MIBD can be reduced the number of differential pair of FDCCII and the DT-MOST technique can be reduced the power supply requirement. Thus, the proposed FDCCII is capable to working with a supply voltage of 0.3 V and it consumes a 0.132 uW of power dissipation. The simulations were performed with SPICE program using the 0.18 um CMOS technology. To prove the workability of the new circuit, the proposed FDCCII has been used to realize universal filter.
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Cannabis Greenhouse Management System with IOT Technology
(2024-01-01)
Tooprakai, Siraphop
;
Panaworn, Rujiphat Thanbumrung Pimlaphat
;
Samrit, Peerawit
This paper presents the cannabis greenhouse management system with IOT technology. The cannabis cultivation control system consists of 2 parts: controlling the environment inside the greenhouse and displaying various statuses in the greenhouse such as temperature, humidity and light, etc.
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Full adder circuit using multi-input MRL
(2020-07-01)
Yamtim, Suparlerk
;
Tooprakai, Siraphop
this paper proposes the Full Adder Circuit using Multi-Input MRL without CMOS. It is designed by Multi-Input MRL which component and delay time less than 1-bit full adder circuit using Hybrid Memristor-CMOS logic. Structure of Purpose circuit is most simple. The performances of Purpose circuit are compared with another full adder circuits are carried out by using LTspice simulator

Tooprakai, Sirapop

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