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 22

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Path loss comparison in 850 MHz and 1800 MHz frequency bands
(2016-09-06)
Bhupuak, Wiyada
;
Tooprakai, Siraphop
Nowadays people widely used mobile phone instead of using landlines phones. This paper proposes to compare the path loss in 850 MHz and 1800 MHz frequency bands by various path loss models. The path loss under terms of the transmitter height and the receiver height. The well known path loss model such as Walfisch-Ikegami (WI), SUI and Ericsson model used to simulate path loss by MATLAB. The results shown that when the longest distance WI model has the most path loss at the receiving antenna height is 1 and 5 meters. The path loss in the frequency bands 1800 MHz is greater than the path loss in the frequency bands 850 MHz under the same conditions. The path loss can be use to determine where to install the mobile base station with high quality. That means at the same distance if using the frequency band 1800 MHz for mobile network in the same technology will require to install the mobiles base station more than using frequency band 800 MHz.
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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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Design high speed and low power hybrid full adder circuit
(2018-12-24)
Lueangsongchai, Sathaporn
;
Tooprakai, Siraphop
This paper presents 1-bit hybrid full adder cells circuit scheme that high speed and low power consumption. This Full adder cells circuit is designed utilization of XOR gate, XNOR gate, pass logic gate and transmission gate. Result of simulation by HSPICE program based on 16 nm CMOS technology with 0.9V power supply voltage and maximum frequency at 8GHz.
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Cannabis Greenhouse Management System with IOT Technology
(2024-01-01)
Tooprakai, Siraphop
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Panaworn, Rujiphat Thanbumrung Pimlaphat
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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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Low power CMOS full adder cells
(2012-10-02)
Sudsakorn, Attapon
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Tooprakai, Siraphop
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Dejhan, Kobchai
This paper presents low power CMOS full adder cells. The full adder cells are utilization to low power by using XOR and XNOR gate architectures with pass transistor logic and transmission gate. All simulation results have been carried out by using HSPICE program simulator based on 22 nm CMOS technology at 1.2 V supply voltages. The operating frequency is 250 MHz. In comparison with other 1 bit adder cells, simulation results show that have used low power consumption and power delay product of SUM and C <inf>OUT</inf>. © 2012 IEEE.
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Designing Appropriate Sensor Values for Surface Forest Fire Alarm Systems Using IoT
(2024-01-01)
Ruengtham, Jiratt
;
Tooprakai, Siraphop
Forest fire are a common problem today, causing serious damage to people's lives and property safety. It also has a huge impact on the ecological balance and economy of the country. Therefore forest fires are an issue that should be prioritized. Thailand is another country facing this problem, despite being used in the era of modernization of the Internet of Things to help alert forest fires. But one of the reasons for such significant losses is IoT technology. The forest fire alarm is installed in an inappropriate location and delays the alarm, causing serious damage. This paper focuses on using IoT technology to design appropriate sensor values for surface forest fire alarm systems. Since surface fires are the most common type of fires in Thailand, researchers designed an experiment using microcontrollers to work with different sensors for detect surface fire. The system consists of microcontroller, DHT 22 humidity and temperature sensor, MQ-2 gas detection sensor and IR Infrared detector flame sensor. The researchers simulated the surface fire, and then measured the parameters of each sensor under different conditions, and determined the best parameters suitable for the forest fire alarm system based on the Internet of Things, and the result was the optimal temperature value 28.2°c and humidity value is 66.9%. The optimal smoke value is 300 and IR Infrared Detector can detect fire at a distance of up to 1 meter. This result is an initial test. The experimental results will be collected as specified in the next step.
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An electrostatic discharge free bootstrapped BiCMOS inverter circuit based on parasitic diode
(2008-12-01)
Tooprakai, Siraphop
;
Dejhan, Kobchai
Electrostatic discharge (ESD) free bootstrapped BiCMOS inverter circuit is proposed. The proposed driver circuit uses the bootstrapped technique; the transistor base voltage is higher than the supply voltage. The input of circuit is arranged to protect the electrostatic discharge problem, and the output waveform is able to have full swing. The proposed circuit consumes low power with small delay time. The transistors in the circuit operate with high performance and efficiency. © 2008 World Scientific Publishing Company.
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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
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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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A 1.1-V Low power true single-phase clock 2/3 prescaler
(2017-10-19)
Tooprakai, Siraphop
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Wisetphanichkij, Sompong
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Tudsorn, Apirak
This paper is proposed a low-power CMOS 2/3 prescaler using true single-phase technique on 45 nm CMOS technology with 1.1 V. The true-single-phase clock divider is used to achieve low power. The prescaler is capable of operating from 1 to 16 GHz. When operating at 1 GHz, it saves more power consumption compared to that of a conventional circuit and lowpower true single-phase clock CMOS 2/3 prescalers circuit operating in divide-by-2 mode and in divide-by-3 mode, respectively.
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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
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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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Tooprakai, Sirapop

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