Rajamangala University of Technology at Thanyaburi

Thanyaburi, Thailand
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Prempraneerach P.,Rajamangala University of Technology at Thanyaburi
20th International Computer Science and Engineering Conference: Smart Ubiquitos Computing and Knowledge, ICSEC 2016 | Year: 2016

Trajectory-Tracking controller using Sliding Mode Control (SMC) approach are derived and applied to control Autonomous Surface Vessel. First, maneuverability performance of catamarans with two different thruster configurations: 1) two rotatable transom thrusters and 2) two fixed transom thrusters accompanying with two bow thrusters, are dynamically simulated with fixed thrusts and evaluated for their turning capability. Second, SMC can yield good trajectory tracking performance only for desired horizontal position, but not for heading angle in the first catamaran configuration because of decoupled transom thrusts, even though undesirable highbandwidth thrusts is used. On the other hand, tight trajectory tracking for both position and heading angle can be easily achieved with smooth thrusts using SMC with boundary layer in the second catamaran configuration with uncoupled thrusts from transom and bow thrusters. © 2016 IEEE.

Kotchasarn C.,Rajamangala University of Technology at Thanyaburi
International Conference on Advanced Communication Technology, ICACT | Year: 2017

Multicarrier code division multiple access (MC-CDMA) is a technique that combines orthogonal frequency division multiplexing (OFDM) and CDMA. The performance analysis of MC-CDMA system with correlated fading channels with α-μ distribution is investigated in this paper. We employ the binary phase shift keying (BPSK) modulation scheme and the maximal ratio combing (MRC) technique at the receiver. By using the definition of Q function expression together with the moment generating function (MGF) method, a simple form of the bit error rate (BER) performance is derived. The results show that the more subcarriers the better BER. The influence of MAI on the system performance is significant and BER saturates at high SNR. © 2017 Global IT Research Institute - GiRI.

Kotchasarn C.,Rajamangala University of Technology at Thanyaburi
International Conference on Advanced Communication Technology, ICACT | Year: 2017

Power line noise is significantly affects on the bit error rate performance of broadband power line communications. The channel model is affected by stochastic attenuation and deep notches which can lead to the limitation of the channel capacity and achievable data rate. In this paper, we analyze the bit error rate (BER) of orthogonal frequency division multiplex (OFDM) using binary phase shift keying (BPSK) modulation technique. The channel characteristic is assumed to be generalized broadband power line channel model and the noise behavior is modeled according to Middleton class A, which is contrast to the other wireless channel and power line communications (PLC). Using central limit theorem, the noises on each sub-carriers are behave as Gaussian noise. Bit error rate of BPSK and MPSK are analyzes under different schemes. We notice that the loss factor, frequency and distance are significantly improving BER performance. © 2017 Global IT Research Institute - GiRI.

Pattanasethanon P.,Rajamangala University of Technology at Thanyaburi
ACM International Conference Proceeding Series | Year: 2017

This research compares the two features within an images, namely, color and edge characteristic and adjusting weight ratios from color weight value 1, edge weight value 1, and 3 color to edge weight ratios; 0.7 to 0.3, 0.5 to 0.5, and 0.3 to 0.7 to retrieve the most relevance query outputs. Based on the results, Color to edge weight ratio at 0.5 to 0.5 retrieved the most relevance query images outputs on RGB color models. The recall value and accuracy remained robust while F-measurements is fair. The HSV model evaluation was fair on both recall value and accuracy, but F-measure signified revision. © 2017 ACM.

Naderi M.Y.,Northeastern University | Nintanavongsa P.,Rajamangala University of Technology at Thanyaburi | Chowdhury K.R.,Northeastern University
IEEE Transactions on Wireless Communications | Year: 2014

Wireless charging through directed radio frequency (RF) waves is an emerging technology that can be used to replenish the battery of a sensor node, albeit at the cost of data communication in the network. This tradeoff between energy transfer and communication functions requires a fresh perspective on medium access control (MAC) protocol design for appropriately sharing the channel. Through an experimental study, we demonstrate how the placement, the chosen frequency, and number of the RF energy transmitters impact the sensor charging time. These studies are then used to design a MAC protocol called RF-MAC that optimizes energy delivery to sensor nodes, while minimizing disruption to data communication. In the course of the protocol design, we describe mechanisms for (i) setting the maximum energy charging threshold, (ii) selecting specific transmitters based on the collective impact on charging time, (iii) requesting and granting energy transfer requests, and (iv) evaluating the respective priorities of data communication and energy transfer. To the best of our knowledge, this is the first distributed MAC protocol for RF energy harvesting sensors, and through a combination of experimentation and simulation studies, we observe 300% maximum network throughput improvement over the classical modified unslotted CSMA MAC protocol. © 2014 IEEE.

Prasartkaew B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2013

Nowadays, global warming and energy crisis problems become serious issues which affect on all creatures on our earth. One of the best ways to simultaneously address or mitigate these problems is more utilizing the renewable energy sources instead of the fossil fuel. A solar-biomass hybrid cooling system is one of the technologies for the climate change and green-house-gas mitigation. The mathematical model of this system was developed and used in the theoretical prediction of its performance and system design. To assess the accuracy of the developed mathematical model, the obtained experimental data is then compared with the simulation results, with the same operating parameters and weather conditions. This paper presents the validation of the developed model. The validation results show that the simulation results are in good agreement with the experimental results from both qualitative and quantitative points of view. © 2013 The Authors. Published by Elsevier.

Bhumkittipich K.,Rajamangala University of Technology at Thanyaburi | Phuangpornpitak W.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2013

This paper presents a new methodology using particle swarm optimization (PSO) for the placement of distributed generation (DG) in the radial distribution systems to reduce the power loss. Single DG placement is used to find the optimal DG location and its size which corresponding to the maximum loss reduction. The proposed method is tested on the 26-bus radial distribution system which modified from the Provincial Electricity Authority (PEA) distribution system. The total power is 8.49 MW and 5.97 MVAR and the power loss is 11.68 kW and 26.08 kVAR. The load flow analysis on distribution use forward-backward sweep methodology. The simulation results show that PSO can obtain the maximum power loss reductions. © 2013 The Authors. Published by Elsevier B.V. © 2013 The Authors. Published by Elsevier B.V.

Chupong C.,Rajamangala University of Technology at Thanyaburi | Plangklang B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2011

PV systems have been increasingly installed worldwide in recent years. Because it produces clean energy, moreover the development of technology is continued therefore the reliability is increasing and the price is decreasing in opposite. To implement the PV system, however, a significant limitation of PV system is the uncertainty of power from the sun. This will affect the quality of the electrical system that connected. Therefore, this article will present the power forecasting of a PV system by calculating the solar radiation, collecting data from weather forecasting, and using Elman neural network to forecast by using data from PV system installed at roof top of Faculty Science and Technology Rajamangala University of Technology Thanyaburi. The results of study found that the tendency to apply this method any further. © 2011 Published by Elsevier Ltd.

Kohsri S.,Rajamangala University of Technology at Thanyaburi | Plangklang B.,Rajamangala University of Technology at Thanyaburi
Energy Procedia | Year: 2011

This paper presents the application energy management system and control system for smart renewable energy power generation. The development of communication platform is use LAB-View technology as a basis design for overall system. The proposed prototype is construct PV 1.8 kWp, Battery 18 kWh, 5 kW Generator. The main central control system will acquire data from the remote renewable energy system. All necessary monitor data are including power generation, load consumption, protection system, and other control parameters will be store at a control unit. All monitoring data are monitored as real-time data therefore the operator can also evaluate the system situation in the current states and make decisions to take an immediate action if needed. The system can be improved by learning from monitored data recorded. Moreover the system itself can forecast and make a decision for future power analysis. © 2011 Published by Elsevier Ltd.

Sakulkhaemaruethai S.,Rajamangala University of Technology at Thanyaburi | Sreethawong T.,Chulalongkorn University
International Journal of Hydrogen Energy | Year: 2011

Mesoporous-assembled TiO2 nanocrystals with very high photocatalytic H2 production activity were synthesized through a modified sol-gel process with the aid of urea as mesopore-directing agent, heat-treated under various calcination temperatures, and assessed for their photocatalytic H2 production activity via water splitting reaction. The resulting mesoporous-assembled TiO2 nanocrystals were systematically characterized by N2 adsorption-desorption analysis, surface area and pore size distribution analyses, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results showed that the photocatalytic H2 production activity of the synthesized mesoporous-assembled TiO2 nanocrystal calcined at 500 °C, which possessed very narrow pore size distribution, was extraordinarily higher than that of the commercially available P-25 TiO 2 and ST-01 TiO2 powders. Copyright © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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