bluuebunny/crossref_metadata_2025 huggingface dataset:
Fingertip Force Measurement of GloveMAP by Using a Flexi Force Sensor
Authors: Wan Khairunizam , Nabilah H.E. , Nor Farahiya  , Hazwan Ali M. , Suhaimi Rashidah , Hazry D. , Shahriman A.B. , Razlan Zuradzman M.
Published: August 2015

Modernization of human technologies overtime results the need of more freedom technology likes the use of natural interaction to replace a current trend interface devices such as joysticks, mice, keyboards and other related output devices. Dataglove is one of the interface devices that could serve a natural interaction between user and computers. In this paper, a dataglove calledGloveMAPis introduced which has the capability of measuring fingertip force. The flexible force sensors are attached to the fingers location of the glove. Several object grasping experiments are conducted and the grasping force signals are measured. A Gaussian filter is introduced to smoothen the acquired force signals.
Poly-Resistor Thin Film Formation by Excimer Laser Micromachine
Authors: Anuar A.F.M. , Wahab Yufridin , Zainol M.Z. , Fazmir H. , Najmi M. , Mazalan M. , Md Arshad M.K.
Published: August 2015

A simple theoretical model and resistor fabrication for calculating the resistance of a polycrystalline silicon thin film is presented. The resistance value for poly-resistor is perfomed in terms of polysilicon thickness and its total area. The KrF excimer laser micromachine is used in assisting the resistor formation for a low pressure chemical vapor deposition (LPCVD) based polysilicon. Laser micromachine with three main parameters is used to aid the fabrication of the poly-resistor; namely as the pulse rate (i.e. number of laser pulses per second), laser beam size and laser energy. These parameters have been investigated to create the isolation between materials and also to achieve the desired poly-resistor shape. Preliminary results show that the 35 um beam size and 15 mJ of energy level is the most effective parameter to produce the pattern. Poly-resistor formation with 12 and 21 number of squares shows the total average resistance of 303.52 Ω and 210.14 Ω respectively. The laser micromachine process also significantly reduce the total time and number of process steps that are required for resistor fabrication.
Deformation Behaviour of Glass Fibre Reinforced Concrete Containing Palm Oil Fuel Ash
Authors: Awal A.S.M.A. , Majid M.Z.A. , Shirazi S.M. , Yuan K.Y.
Published: August 2015

Palm oil fuel ash (POFA) has been known to be a good pozzolanic material and played an effective role in improving the physical and mechanical properties of concrete. This paper highlights the results obtained from the laboratory tests on compressive strength, modulus of elasticity, creep and shrinkage of glass fibre reinforced concrete (GFRC) containing POFA. Concrete specimens of grade 30 was designed following DoE method where GFRC with 0.5% fibre content was prepared with OPC replaced by 20% POFA by weight. Laboratory tests based on short-term investigation showed that the modulus of elasticity of GFRC containing POFA in association with its compressive strength was slightly lower than that of concrete without POFA. The measured values of creep and shrinkage, however, revealed that the creep and shrinkage strain of GFRC containing POFA were higher than that of concrete with OPC alone. On the basis of short-term investigation, the one-year creep and shrinkage values of both types of concrete were also predicted by extrapolating the data obtained in this study.
Consideration of Factors Towards Lowering the Natural Frequency of MEMS Based Cantilever Structure: Top Mass versus Back Etch Design
Authors: Khairul Adly A.W. , Wahab Y. , Shakaff A.Y.M. , Mazalan Mazlee
Published: August 2015

The ability to self-energize wireless sensor node promote the popularity of energy harvesting technique especially by using ambient vibration as the source of energy. In addition, the successful integration of the energy harvesting element on the same wafer as a wireless sensor node will promote the production in the MEMS scale and will reduce the overall cost of production. The usage of the cantilever structure as the transducer for converting mechanical energy (vibration) due to deflection of cantilever into the electrical energy is possible by depositing piezoelectric material on the cantilever. The usage of cantilever provide the simplest way for fabrication in the MEMS scale and also provide the ability to achieve low natural frequency. This paper present the work done on the simulation of the cantilever structure with the top end and back etch proof mass towards achieving low natural frequency in the MEMS scale by using IntelliSuite software.
Coupling Gap Analysis of Microring Photonic Wavelength Switch
Authors: Najmi M. , Wahid M.H.A. , Wahab Y. , Anuar A.F.M. , Fazmir H. , Mazalan M.
Published: August 2015

Microring resonators side coupled to signal waveguides provide compact, narrow band, and large free spectral range photonic channel dropping wavelength switch. Wavelength switch with improved passband characteristics and larger out-of-band signal rejection are realized through the coupling of rings. The analysis of these devices is demonstrated by the novel method of coupling. The response of switch comprised of different coupling gap may be written down by attenuation ratio.
Design of Automated Moving Stage with Adaptive Focus System to Support Microscopy Image Stitching
Authors: Bhakti Tatag Lindu , Susanto Adhi , Santosa Paulus Insap , Widayati Diah Tri
Published: August 2015

Image stitching is a method to obtain high-resolution images through compositing several image elements using invariant pattern recognizing and matching between each image elements involved. This method can remove resolution restriction in digital microscopy imaging. This study aims to design automated stitching with adaptive focus mechanism to achieve high-quality final stitched image. We attach three-axis microscopic actuator into Olympus CX-21 light microscope. The actuator has been programmed to support image elements capture with adaptive focus ability to compensate focus plane changes due to unevenness object surface, inhomogeneous slide thickness and imperfection of preparation holder.
Testing results show automated moving stage has horizontal step resolution 0.198±0.001 μm/step with hysteresis 5.99±1.09 μm and vertical step resolution 0.197±0.004 μm/step with hysteresis 2.36±1.28 μm at maximum speed 3,675μm/sec in 16 sub-division microstep setting value. Automated moving stage has also linear response with R2=0.999. Adaptive focus testing show satisfied optimum objective height locking stability using identical factor ε=95% for every objective application below 100x. Adaptive focus success stabilizes Zopt for every image element to generate final stitched image with homogenous focus value.
Design and Investigation of H-Shaped Patch Antenna Integrated with Light Emitting Diodes
Authors: Kamarudin S.N. , Ali M.T. , Subahir S. , Azlan A.A. , Muhamud-Kayat S. , Kamarudin Muhammad Ramlee
Published: August 2015

The limitations in the applications of microstrip antenna lead to wastage in the form of space and functionality. In order to overcome the wastage of space and functionality of the microstrip antenna, the new idea is to make one single device of microstrip antenna which has two application at the same time where it can operates as antenna and the function as lighting source is proposed. Light Emitting Diode (LED) has been chosen as the light source since the characteristic and the structure of the LED are suitable for the integration process. Hence, this paper presents an investigation on the characteristic of an H-shaped patch antenna integrated with Light Emitting Diodes (LEDs).The proposed integrated antenna has been designed and simulated by using Computer Simulation Technology (CST) Microwave Studio Software. It has been fabricated and measured to investigate the performance of the antenna in terms of return loss. The results confirms that the antenna can operate at 2.4 GHz and it works well as an illumination.
Development of Embedded Simple Network Time Protocol Client Clock
Authors: Dathong Veerawat , Wongsaisuwan Manop
Published: August 2015

This paper describes the development of an embedded SNTP clock which applies NTP Protocol to embedded clock to realize the high accuracy and precision SNTP client clock. It consists of three parts which are the communication part to communicate between NTP Server and SNTP client clock, the data processing part to process data packet, and maintain accuracy, precision of time, and the result displaying part to show time together with the reliability status of the clock. This article explains the concept of applying and analyzing NTP packet, process of maintaining accuracy and precision of time and displaying the result, and hardware, software designs. This paper will provide the introduction of NTP, the development of NTP on the embedded clock, the simulation, and results of the experiment.
The Effect of Anode Width of Dual Schottky Magnetodiode to Sensitivity
Authors: Phetchakul Toempong , Luanatikomkul Wittaya , Poyai Amporn
Published: August 2015

This article studies the effect of anode width of dual schottky magnetodiode to sensitivity. The width is varied at 5, 15 and 35 μm with the forward bias 0.2 mA and reverse bias 0.25 nA. The applied magnetic field is varied from -0.4 T - 0.4 T. The output response DID is the cathode current difference. The best relative sensitivity SR is 54.6 mT-1 in the case of reverse bias at WA= 5 μm. The worst SR is 26.9 mT-1in the case of forward bias at WA= 35 μm. It depends on the ratio of the distance of deviation current in Y direction (DY) to the width of anode WA. It shows that the width WA should be design as narrow as possible and the operating current should be kept as low as one can. The current density from simulation can explain the mechanism of the device.
Free Layer Characterization of TMR Head with Multi-Stripe Height by Using Ferro Magnetic Resonance Analyzer (FMRA)
Authors: Weawhongse P. , Sa-Ngiamsak Chiranut , Pijitrojana Wanchai , Vichienchom Kasin
Published: August 2015

As continued reducing the track width (TW) of magnetic read sensor for gaining areal density in hard disk drive (HDD) industry, stripe height (SH) is needed to be reduced as keeping aspect ratio(TW/SH) for maintain resistance and signal constant. This paper is proposed to characterize the free layer behavior of tunneling magneto resistive (TMR) head with multiple SH by using ferro magnetic resonance analyzer (FMRA) that is able to analyze by layer-level state without applying external field. The results are found that, at shorter SH, effective stiffness field of free layer is increased which is based on decreasing FMR amplitude and increasing FMR frequency. As a result, magnetic read sensor is shown less sensitivity and signal to noise ratio (SNR) with shorter SH. The SH is a correlated function of the effective stiffness field in free layer that is referred to changed shape anisotropy field which has an effect to read ability.
Effects of Magnetic Properties of L10-CoPt based Bit Patterned Media with Tilted-Easy Axis on Switching Field at Areal Density over 2 Tb/in2
Authors: Kaewrawang Arkom
Published: August 2015

Decrease of a switching field, Hsw, of the magnetic media with high magnetocrystalline anisotropy constant, Ku, can be handled by tilted-easy axis. Not only tilting easy direction of crystal but also optimum magnetic properties can improve writability. The effects of Ku and saturation magnetization, Ms, of L10-CoPt material of BPM with 45° tilted-easy axis are investigated in this article. The object oriented micromagnetic framework package based on Landau - Lifshitz - Gilbert equation has been used to analyze the magnetic properties of media in this paper. The results indicate that the Hsw decreases with decreasing Ku and increasing Ms. To achieve the Hsw lower than the maximum write head field, the Ku and Ms values should not be over 1.30 MJ/m3 and should exceed 0.30 MA/m, respectively.
Micromagnetic Modeling for a Study of Spin Transfer Torque in Ferromagnetic Materials
Authors: Coomkeaw Samutchar , Damrongsak Badin
Published: August 2015

We have developed a numerical model for investigating a motion of magnetic moments in ferromagnetic materials with spin transfer torque (STT). The model can be used to provide a basic understanding of the switching dynamics and can be used as a tool to design and develop magnetic random access memories (MRAM). The relevant equation used in this work was the Landau-Lifshitz-Gilbert (LLG) equation with the additional STT term. The equation was used to describe the dynamical behavior of a magnetization which is exposed to an applied spin current and an effective field. The effects of thermal fluctuations on the motion of magnetic moments were excluded. The model was implemented in MATLABTM using a finite difference method (FDM). The program was verified with two-spin system and standard problems. Simulation results were also compared with those obtained from OOMMF.
Equalizer Design for Bit-Patterned Media Recording System Based on ISI and ITI Estimations by Cross Correlation Functions
Authors: Myint Lin Min Min , Warisarn Chanon
Published: August 2015

Due to ultra-high density, a bit-patterned media recording (BPMR) system experiences two-dimensional (2D) interference--inter-symbol interference (ISI) and inter-track interference (ITI)--which degrades the overall performance of a recording systems. Therefore, we propose a novel single-track equalization and a single track detection that can perform these duties almost equally well. Our novel equalizer design uses ISI and ITI estimation schemes with the help of cross-correlation functions. The simulation result shows that our proposed method is able to achieve a significant performance gain over the one-dimensional (1D) equalization method and the conventional joint-track equalization, especially at higher recording density.
Dual-Port MIMO Rectangular Dielectric Resonator Antenna for 4G-LTE Application
Authors: Selvaraju Raghuraman , Kamarudin Muhammad Ramlee , Khalily Mohsen , Jamaluddin Mohd Haizal , Nasir Jamal
Published: August 2015

A Multi Input Multi Output (MIMO) Rectangular Dielectric Resonator Antenna (RDRA) for 1.8 GHz Long Term Evolution (LTE) applications is investigated and presented. The antenna consisting of two rectangular dielectric resonator elements, both resonators are fed by microstrip feed line is etched on FR4 substrate. The simulated impedance bandwidth for port1 and port2 is 26.38% (1.6176-2.1093 GHz) and 26.80% (1.6146-2.1143GHz) respectively for |S11| ≤ -6dB, which can operate on LTE band 1-4,9,10,35-37 and 39. The gain of the MIMO RDRA is 3.2 dBi and 3.1 dBi at 1.8 GHz for port 1and port 2, respectively. The S-parameters, isolation, gain, and MIMO performance such as correlation coefficient and diversity gain of the presented RDR Antenna have been studied.
Modelling and Simulation of the 150° Conduction Mode Quasi Space Vector PWM Inverter Fed Permanent Magnet Brushless DC Motor
Authors: Weerakamhaeng Yossawee
Published: August 2015

This paper presents an alternative space vector pwm scheme of 150o conduction mode for the three phase voltage source inverter (3PVSI) with the switching periods, of six switches, determined by the Quasi Space Vector (QSV) relevant to the rotor of the three phase Permanent Magnet Brushless DC(3PPMBLDC) Motor. Performance can be delineated through the dynamic model of 3PPMBLDC motor with the simulations of torque and speed characteristics when applied by 3PVSI with this modulation scheme.
Resonance Impact on Power Factor Correction System in Power System with Harmonic Distortion
Authors: Chaladying Saran , Dusitakorn Pana , Rugthaichareoncheep Nattachote
Published: August 2015

This paper presents the resonance impact on power factor correction system (PFC system) in power system with harmonic distortion. The main purpose is to show harmonic current amplification that generated by the parallel resonance phenomenon in power system and problem solution. The power system model for analysis consist of the harmonic current source and PFC system. These devices are established by MATHLAB/Simulink. In simulation, the variable speed drive, which is DC drive, instead to the harmonic current source in power system that use capacitor to improve power factor of system. The problem solution, the series reactor, which is detune filter, is used to correct parallel resonance problem, by connecting capacitor with the series reactor, which is detune filter. The result of simulation, detune filter is able to avoid the parallel resonance phenomenon and partially reduce harmonic current that flowing to capacitor, however the series reactor, which is detune filter, is unable to reduce harmonic current of the harmonic current source.
Substation Expansion Considering Reliability of Various Bus Configurations and Load Growth
Authors: Nathasri Winai , Witoontorn Witsaroot , Chaitusaney Surachai
Published: August 2015

This paper proposes a method for electrical substation expansion by considering reliability indices of various types of bus configuration in electrical substation. The reliability indices LOLF, LOLP, and EENS are evaluated by using Newton-Raphson power flow calculation with minimal cut sets. The yearly load growth, together with power capacity of components (capacity limit of components), and the operation of protective components are also taken into account. Two types of failures, i.e. active failure and passive failure, are considered. Finally, the reliability of all bus configuration types in electrical substation is compared by the reliability indices.
Impacts of Solar-PV Rooftop on PEA’s Distribution System in the Area of Hemaraj Eastern Seaboard Industrial Estates, Thailand
Authors: Wetchakama Sarayuth , Supatti Uthane
Published: August 2015

This paper presents power quality analysis and impact of power solar rooftop on distribution system of the Provincial Electricity Authority (PEA) in Thailand. The case study used in this paper is a 996 kWpeak solar photovoltaic (PV) distribution generator (DG) system which connected to 22 kV at Pluak Daeng 3 substation in Pluak Daeng, Rayong, Thailand. Experiment and simulation are used in power quality analysis. The simulation is conducted through the DIgSILENT PowerFactory program to analyze the behavior of the DG system on the PEA power distribution. Experimental results show that all qualities of power from solar rooftop meet the PEA’s standard criteria while the simulation results show that over 4 MW of solar rooftop generation, the voltage of utility grid system would be affected during cloudy periods. However, if the PV system produces 2-3 MW of power, the distribution system would be benefit.
RFID Reader Antenna Design for Groceries Auto Payment System
Authors: Abd Rohim Amira , Kamarudin Muhammad Ramlee , Ali M.T.
Published: August 2015

A microstrip patch antenna for RFID reader is presented in this paper. It operates within the RFID international UHF band (902-928MHz) which the center frequency is at 915MHz with 15dB of return loss value. The frequency ranges also cover the RFID UHF band for Malaysia (912-923MHz). The main objective for this antenna is to implement it in the RFID reader for an auto payment application. Some results have been shown between CST Microwave Studio, HFSS and the measurement. Good agreement is achieved for the used in the RFID UHF band.
Baseline Consideration for Lightning Location System Based on Magnetic Field Direction Finding to Determine Optimal Grid Cell of Lightning Flash Density Map
Authors: Nattanapong Kongtrakul , Weerapun Rungseevijitprapa
Published: August 2015

Lightning flash density map from lightning location system is primary for lightning protection. The baseline of lightning location system affects not only location accuracy, but also accuracy of lightning flash density. In order to obtain lightning flash density map, the different baselines were studied to determine optimum grid cell. This paper utilizes the capabilities of Matlab® software to simulate grid cell by using magnetic direction finding technique and Marquardt method. These baselines were generated between 150 km and 250 km. In addition, grid cells were created at spatial resolutions of 10 km to 50 km, and cloud-to-ground lightning strikes were randomly created at density, ranging from 1 to 10 strikes per square kilometer. The mean error values of lightning location system are obtained between 1.756 km and 2.885 km from baseline 150 km to 250 km. Size of optimal grid cells must be designed 21.8 km and 23 km for baselines 150 km and 250 km respectively.
3-D Computational Simulations of Electrostatic Potential in Partial Surfaces towards the Precision of Ion Balance Analysis
Authors: Plong-Ngooluam Sayan , Jindapetch Nattha , Wounchoum Phairote , Sompongse Duangporn
Published: August 2015

This paper reports a 3-D computational simulation of electrostatic potential uniformity which was affected by various measurement plates. The finite element analysis method has been done by COMSOL Multiphysics to model the electrostatic potential behavior. The electrostatic potential from two electrodes in the free space plane has been modeled and used as a reference result to compare with the electrostatic potential results of four various measurement plates including the standard 6"x6" charged plate and its dividing by four, nine and sixteen segments. This investigation revealed the uniformity error of the electrostatic potential from the conventional plate. The precision of ion balance analysis can be improved by the using of a partial surface, i.e. by dividing the conventional plate into smaller sizes.
The Comparative Study of PD Detecting in Power Transformer Model According to Acoustic Emission and IEC270 Standard Method
Authors: Jitjing Pinit , Sritong Paran , Suwanasri Cattareeya , Suwanasri Thanapong
Published: August 2015

This paper presents a comparative study of partial discharge (PD) detection technique of power transformer model. The acoustic emission (AE) method was applied to detect the signal from PD-origin in a model of the power transformer tank according to IEEE standard C57.127. The Time Difference of Arrival (TDOA) technique was additionally applied. In the experiment, a simulated PD-origin was set up inside the transformer tank. Four acoustic sensors were installed on the tank surface, which were used to detect and provide the signal to a signal amplifier and data recorder. Multifunction Compact NI-DAQ 9223 was used together with 1 slot Chassis model 9191 in order to transfer the data to computer by using LAN or wireless system. The AE signal of PD-origin was then collected and analyzed with the Lab View program to identify the location of PD-origin. All physical dimensions of power transformer such as width, length and height and position of each acoustic sensor (in centimeters) were loaded into the main program. Then, the pattern of PD-origin was simulated at different positions in oil-filled transformer tank model. Finally, the localization result was displayed in a graphic user-interface screen. The acquired signal from this method was subsequently compared with the conventional PD detection method using IEC60270 standard in order to observe the PD. The experimental results were satisfactory and could be applied practically.
Partial Discharge Detection and Localization of Simulated Cable System
Authors: Suwanasri Cattareeya , Suwanasri Thanapong , Fuangpian Phanupong
Published: August 2015

This paper presents the partial discharge detection and localization of degraded insulation within standard test objects and simulated power cable rated 6.2/7 kV. To verify a performance of on-line partial discharge diagnosis tool, the HFCT was used to compare with an off-line measurement tool based on IEC60270 standard. The Time Domain Reflectometry was also applied for partial discharge localization to identify partial discharge position of the simulated cable system in abnormal condition of insulation. The results show a good performance of on-line measurement tool. The methods for both partial discharge detection and localization are suitable for on-line condition monitoring. They can detect very small defects in the insulation, on time maintenance and repair, prevent failure and destruction, and prolong life expectancy of underground cable system.
Optimization for Operation and Design of Solar-Hydro Pump Energy Storage Using GAMS
Authors: Mekmuangthong Chalermchat , Premrudeepreechacharn Suttichai
Published: August 2015

Mae Sariang is remote area about 200 kilometers from main substation, which creates several problems of power system operation, specially losses and reliability. This paper studies the optimize operation and design sizing of lower reservoir and pump station for hydro pump energy storage in order to maximize profit. The system is modelled using GAMS. Data in analysis are based on load, power generation from solar farm, natural stream flowed profile in Mae Sariang area. From the simulation results, the optimized size of hydro pump storage should be 6.6 MW, the size of pump at 2.07 MW, the lower reservoir volume capacity at least 20,731 cubic meter. The maximum profit is 56.45 million baht per year and optimized operation results in winter season have the excess energy will be used to pump the water to upper reservoir. Summer season the power system has to import power from grid and lower profit more than other season. Rainy season the power system can use power from hydro pump system as hydro power plant without drawing from the grid and best profit more than other seasons. Natural stream is important to sensitivity analyze it is the important variables that greatest profit. If in upstream problems with little rainfall, forests were destroyed. They will have problem solve in the future.
Experimental Study on the Movement of Conducting Spheroidal Particles under Electric Field in Air
Authors: Sangsri Tatchawin , Huynh Viet Quoc , Techaumnat Boonchai
Published: August 2015

Study on the movement of conducting particle is useful for managing particles in gas insulation systems. The authors observed the movement of conducting prolate spheroidal particles under uniform electric field in air. From the experimental results we found three patterns of the movement. The critical electric field results in particle rotating or lifting. The particles rotated about the contact point before lifting in most cases. The measured particle-rotating field was lower than the analytical ones by 6 and 21% for 9 and 18 mm gaps, respectively. From the experiment, the size of the particles and the gap distance affect the critical field. The voltage polarity has no effect on the critical field for particle movement because of little difference between the experimental values of positive and negative polarities.
Design and Construction of 30 kV High Voltage Generator Using Fly-Back Converter
Authors: Singhasathein A. , Kesi W. , Boonyayut S. , Suwanpingkarl Pasist , Poungsri Piyapat , Pruksanubal Apibal , Tanthanuch Nattapong
Published: August 2015

This paper mentions the design and construction of high voltage generator 30 kV using a Fly-back converter. The designed circuit includes the high frequency switching generator which applies power to the primary input voltage of Fly-back transformer. The input power is transformed to be high voltage on the secondary side of Fly-back transformer. The half wave rectifier is constructed for the high voltage direct current (HVDC). Resistive voltage divider is designed and constructed to measure HVDC as well. Moreover, the characteristics of output voltage waveform of the proposed generator is compared with the waveform of the HVDC from Cockroft – Walton circuit.The.comparison.results.show.good.agreement.with.small.difference.
A Numerical Study of the Fixed-Threshold Criterion for Expressing Transient Stability Constraints in Optimal Power Flow
Authors: Suampun Warut
Published: August 2015

A numerical study of the widely used fixed-threshold criterion for expressing transient stability constraints in optimal power flow (TSCOPF) is conducted. Based on a stability-region framework, a more accurate expression of transient stability constraint in TSCOPF is presented. A method for computing system exact threshold values is proposed and employed for the study of threshold values under different conditions. It is shown via numerical results on the WSCC9 and IEEE145 systems that the exact threshold value for each system and contingency is in fact not a constant, and can vary greatly depending on several factors such as types of contingency, loading conditions, and network topology.
Optimal Parameters Tuning of Power System Stabilizer via Bees Algorithm
Authors: Ab Khalid Nur Safura , Mustafa Mohd Wazir , Mohamed Idris Rasyidah
Published: August 2015

This paper presents a new approach for designing the Power System Stabilizer. As in power system network, low frequency oscillation always occurs for a long period of time that will decrease the power transfer capability. Power System Stabilizer known as PSS is being installed as one of the control devices in a generating unit. The conventional PSS (CPSS) is the most commonly used in power system, which uses lead-lag compensation. The lack in CPSS has drawn an interest of designing the new approach of PSS to outperform the conventional one. Thus, Bees Algorithm (BA) which is known as one of the numerous intelligent optimization methods is proposed in this paper. It is appears to aid the system stability by optimizing the PSS parameters tuning. The PSS with the BA approach is labelled as BA-PSS and being tested on single machine infinite bus system (SMIB) in Matlab/Simulink environment. BA-PSS performance is compared with CPSS as to validate the ability of the proposed method to achieve great performance in power system stability enhancement. Different type of mechanical input is being injected into the system and the result shows that BA-PSS is capable to optimize the parameters tuning of PSS. BA-PSS also improved the unstable or poorly stable modes as the system achieve the stability with lower overshoot and less time settling. The superior response of BA-PSS controller proved the ability of BA approach in which is capable to solve the lack in CPSS with better performance in enhancing the system stability.
A Grid Connected Flyback Inverter with a DC Active Filter for Photovoltaic Cells
Authors: Sulong Dome , Jeraputra Chuttchaval
Published: August 2015

This paper presents the design and control of a grid-connected flyback inverter with a DC active filter for photovoltaic (PV) cells. The proposed topology consists of a flyback DC-AC inverter and a DC active filter that can operate independently. The flyback inverter, controlled in digital peak current mode, regulates the full-wave rectified sinusoidal current later, which is alternately inverted and injected into the grid. The DC active filter regulates the smooth current/power drawn from a PV module by using cascaded proportional-integral (PI) controllers. Analysis, design and control of the proposed topology are presented. A 100W/220V/50Hz prototype is developed and tested. The experimental results show that the proposed flyback inverter with a DC active filter is capable of regulating a sinusoidal current fed into the grid, actively filtering the DC current/power and achieving reasonably high energy conversion efficiency.
Voltage Multiplier Circuits with Coupled-Inductor Applied to a High Step-Up DC-DC Converter
Authors: Reaungepattanawiwat Chalermpol , Kanthaphayao Yutthana
Published: August 2015

This paper presents a high voltage gain of a DC-DC converter. The proposed system consists of voltage multiplier circuits and a coupled inductor of a boost DC-DC converter. The input voltage of the voltage multiplier circuit is the induced voltage of inductor at a boost DC-DC converter. The field programmable gate array (FGPA) is used for generating the control signal of the proposed system. To verify the proposed circuit, an experiment was conducted from the prototype circuit. The proposed circuit can step-up the voltage with high voltage gain. Moreover, the voltage across the switch is very low.
Design of A2DOF Controller with Smith Predictor for LLC Current-Resonant DC-DC Converters
Authors: Suzuki Tekehiro , Higuchi Kohji , Jirasereeamornkul Kamon
Published: August 2015

LLC current-resonant converters have greater non-linear characteristics as compared to conventional DC-DC converters. Thus controlling LLC converters is difficult. In particular, the influence of an input delay time isn’t negligible at heavy load. In this paper, an A2DOF (Approximate 2-Degree-Of Freedom) controller with Simith predictor is proposed to compensate the input delay time of LLC current-resonant DC-DC converter. Experimental studies using a microprocessor for the controller demonstrate that this type of digital controller is effective to suppress the influences of the input delay time and the output variations at the sudden load change.
The Double Forward Converter with Synchronous Rectification
Authors: Krajam Kumkrong , Po-Ngam Sakorn
Published: August 2015

In many switching power supply converters, diode rectifiers are used to obtain the DC output voltage. The conduction loss of these diodes rectifier contributes significantly to the overall power loss, especially for low-voltage, high-current converter applications. The conduction loss of rectifying diode is given by the product of its forward-voltage drop and forward conduction current. By replacing the diode rectifiers with a MOSFET operating as a synchronous rectifier (SR), the equivalent forward-voltage drop can be lowered and, consequently, the conduction loss can be reduced because the switching power supply converter need high efficiency. The double forward converter with synchronous rectification is proposed in this paper. The circuit’s guidelines of the double forward controller in the double forward converter and the synchronous rectifier controller in the synchronous rectification are also presented. Validity of the proposed double forward converter with synchronous is confirmed by simulations.
LDPC Coded 2m-ary QAM for Ultra High Speed Communications
Authors: Wongroekdee Sawitree , Chaiprathum Kosin , Imtawil Virasit , Suthisopapan Puripong
Published: August 2015

Modern communication systems that employ LDPC codes and QAM modulation can achieve high speed and reliable transmission without bandwidth expansion. In this paper, the performances of LDPC codes with 2m- ary QAM at m>10, which can provide enormous bandwidth efficiency, are studied. Bit error rate performances of various combinations of LDPC codes and order of QAM are provided. From the results, the performance of LDPC coded ultra-high order QAM is excellent making this system very attractive for ultra-high speed communications.
Parametric Performances of a Petahertz Band Nano-Patch Dipole Antenna on Electrical Field Distribution for Energy Harvesting
Authors: Esa Mazlina , Ismail Mohd. Khairul Hisham , Murad Noor Asniza , Nik Abd. Malik Nik Noordini , Mohd Yusoff Mohd Fairus , Hamzah Shipun Anuar
Published: August 2015

There is an important need to investigate the enhancement of electrical field in visible and near infra-red region for a nanopatch antenna. This paper presents the relationship between metal thicknesses and electrical field with dedicated amount of dielectric material by using a typical design concept of a patch antenna. Two metal thicknesses have been considered, the radiating patch and ground layer. It was found that the decrement of electrical field can be clearly observed through parametric investigation of the metal thickness. Additionally, the resonance peak response is similar to an electrical field which decreases with increasing metal thickness. It can be concluded that the change of an antenna parameter is capable to control two properties for a desired application.
Effect of Electrical Field Resonances due to Perturbation Slit Tunnel Junction for a Potential Solar Energy Collector at 10 Micrometer Radiation
Authors: Esa Mazlina , Ismail Mohd. Khairul Hisham , Murad Noor Asniza , Nik Abd. Malik Nik Noordini , Mohd Yusoff Mohd Fairus , Hamzah Shipun Anuar
Published: August 2015

A potential solar energy collector is proposed. The design is a new rectangular antenna with perturbation slit tunnel junction that exhibits highly confined electrical-field at 10 micrometer radiation. The configuration operates at the centre resonant for thermal radiation spectrum. The vital idea behind this proposed design is to trap and guide out the electrical-field using slit tunnel into a convenient location for potential solar energy collector. The trapping electrical field achieved is enhanced up to 110 V/m with an excitation plane wave of 1 V/m. Meanwhile, a wider half-field strength bandwidth up to 13.5 THz is successfully excited to cover most of the thermal radiation spectrum. By the introduction of a tunnel junction of 0.1 micrometer for diode integration, the electrical field magnitude slightly decreased to 98.3 V/m with half-field strength bandwidth of 12 THz. Furthermore, the promising results generated by finite integration technique (FIT) method offers the proposed design to be a potential candidate for energy harvesting devices at 10 micrometer thermal radiation of the sun.
A Randomized Approach in Identifying High Quality Force Closure Grasp from Contact Points in Real Time
Authors: Watcharawisetkul Watcharapol , Borwornpadungkitti Mana , Niparnan Nattee , Sudsang Attawith
Published: August 2015

We proposed a randomized algorithm that can effectively identify a large number of high quality force closure grasps in short time. This task is very important when we consider grasping in real time where a large number of force closure grasps are needed as a candidate for planning in higher level. The key idea of our method is that a concurrent grasp is usually a high quality grasp and a concurrent grasp can be quickly identified by providing heuristic in choosing a concurrent point. A comparison of our method with other methods was performed and the result indicates that our method outperforms other methods.
Study of the Feeding Techniques of Microstrip Antenna at 28 GHz for 5G Applications
Authors: Zainal Noor Ainniesafina , Kamarudin Muhammad Ramlee , Shahadan Nor Hidayu , Nasir Jamal , Khalily Mohsen , Seman Norhudah
Published: August 2015

This work presents a simulation of two different feeding techniques of microstrip patch antenna for 28GHz, 5G applications. The antenna fed by inset feed line and coplanar feed line. The simulated results using High Frequency Structure Simulator (HFSS) shows that both the reflection coefficient of less than-10dB have been achieved over a frequency of 28GHz; demonstrate a gain of 7.96dBi and 5.72dBi for the inset feed line and coplanar feed line, respectively.
Tracking from Unmanned Aerial Vehicles
Authors: Meng Channa , Morris John , Sombattheera Chattraku
Published: August 2015

We use multiple tracking agents in parallel for autonomously tracking an arbitrary target from an unmanned aerial vehicle.
An object initially selected by a user
from a possibly cluttered scene containing other static and moving objects and
occlusions - both partial and complete - is tracked as long as it remains in view
using a single light-weight camera readily installed in a UAV.
We assumed, for the present, at least, that the UAV sends images
to a ground station which controls it.
We evaluated several individual tracking agents in terms of tracking success and their times for processing
frames streamed from the UAV to the ground station at 25 fps, so that the system
shoud compute results in 40ms. Histogram trackers were most successful at $\sim 10$ ms per frame
which can be further optimized.
A Study of Two Robust Features for Effective Open or Closed Eye Classification
Authors: Tiawongsombat Prasertsak , Rattanapoka Choopan
Published: August 2015

Open and closed states of eyes play an important role in human-computer interaction. They can be used as communication method for people with severe disabilities providing an alternate input modality to control a computer or as detection method for a driver's drowsiness. This paper introduces a study on two eye components (i.e., iris and sclera) for robust open or closed eye classification. Evidently, the area of iris or sclera increases while a person opens an eye and decreases while an eye is closing. In particular, the distributions of these eye components, during each eye state, form a bell-like shape. Consequently, an eye state classification can be effectively achieved by Bayes classifier. Finally, the performance comparison of the proposed features against the ground truth is discussed.
An Improvement Particle Swarm Optimization for Travelling Salesman Problem with the Mutation Operator
Authors: Sriborikit Jaturong , Tuwanut Panwit
Published: August 2015

This document proposed improvement PSO with applying mutation operator for solving Travelling Salesman Problem. To PSO solve or decrease trapping in local optimum. From experiment results of this research show that results of PSO with applying mutation operator obtain better than results of normal PSO for solving TSP.
A Preference-Based Multiobjective Evolutioary Algorithm for Finding Knee Solutions
Authors: Sudeng Sufian , Wattanapongsakorn Naruemon
Published: August 2015

The aim of this paper is to develop a knee-based Multi-Objective Evolutionary Algorithm (MOEA) which is a method to find optimal solutions focusing on knee regions. The knee solutions are very interesting to the decision maker (DM) when he/she does not have an explicit preference. The proposed approach uses the extended angle-based dominance concept to guide the search towards knee regions. The extent of the obtained solutions can be controlled by the means of user-supplied density controller parameter. The approach is demonstrated with two and three-objective knee-based test problems. The results have shown that our approach is competitive to well-known knee-based MOEAs in convergence view point.
Real-Time Bilateral Filtering Using GPGPU
Authors: Srisuk Sanun , Kesjindatanawaj Wachirapong , Ongkittikul Surachai
Published: August 2015

In this paper, we present a technique for accelerating the bilateral filtering using GPGPU. Bilateral filtering is a tool for an image smoothing with edge preserving properties. It serves as a mixture of domain and range filters. Domain filter suppresses Gaussian noise while range filter maintains sharp edges. Bilateral filtering is a nonlinear filtering in which the filter kernel must be computed pixel by pixel. Therefore conventional fast Fourier transform technique cannot be used to accelerate the bilateral filtering. Instead, general purpose GPU is used as a parallel machine to reduce time consuming of the bilateral filtering. We will show the experimental results by comparing the computation time of CPU and GPU. It was cleared that, from the experimental results, GPU outperformed the CPU in terms of computation time.
Chromatin Detection in Malaria Thick Blood Film Using Automated Image Processing
Authors: Pinkaew Aeggarut , Limpiti Tulaya , Trirat Akraphon
Published: August 2015

Malaria is a serious global health problem and rapid, accurate diagnosis is required to control the disease. An image processing algorithm to aid the diagnosis of malaria on thick blood films is developed. Morphological and automatic threshold selection techniques are applied on two color components from the HSI color model to identify chromatins of P. Falciparum and P. Vivax malaria species on the images. Chromatins are positively identified with good sensitivities for both species. After identifying the position of chromatins, the algorithm splits the image into small sub-images, each with a chromatin in the center. These small images can subsequently be used by technician to classify malaria species more conveniently.
Increased Probability of Cell Membrane Breakdown by Use of Microfluidic System
Authors: Thonapan Thanaphat , Techaumnat Boonchai , Tuantranont Adisorn
Published: August 2015

This research shows the experiment results of cell membrane breakdown. We did the experiments by using plant protoplasts in a microfluidic system to increase the efficiency of membrane charging process. In the experiment, we apply 5 MHz of sine wave to attract the cell to target position and then apply 10–200 kHz to make breakdown occur. Under the experiment conditions (R = 10–25 μm, U = 10 VP, tL = 10 ms, σ = 45–55 mS/m), the use of microfluidic system with insulating wall and orifice increased breakdown probability. Breakdown probability is 86.8%, and the probabilities of fL at 10–100 kHz are higher than the probability of fL at 200 kHz.
Heart Disease Classification Using Artificial Neural Networks
Authors: Wongsathan Rati , Pothong Pasit
Published: August 2015

Neural Networks (NNs) has emerged as an importance tool for classification in the field of decision making. The main objective of this work is to design the structure and select the optimized parameter in the neural networks to implement the heart disease classifier. Three types of neural networks, i.e. Multi-layered Perceptron Neural Network (MLP-NN), Radial Basis Function Neural Networks (RBF-NN), and Generalized Regression Neural Network (GR-NN) have been used to test the performance of heart disease classification. The classification accuracy obtained by RBFNN gave a very high performance than MLP-NN and GR-NN respectively. The performance of accuracy is very promising compared with the previously reported another type of neural networks.
Forecasting of Production and Consumption of Ethanol in Thailand Using Time Series Analysis
Authors: Sriyotha Sasiwimon , Homchalee Rojanee , Sessomboon Weerapat
Published: August 2015

Ethanol is the important renewable energy in Thailand. It is alcohol produced from sugarcane and tapioca that are agricultural products available in Thailand. Ethanol is used to blend with gasoline for use as gasohol. Ethanol production and consumption in Thailand are fluctuating. Consequently, planning of ethanol production and consumption is irrelevant. In order to solve this problem, this study aims to find forecasting models using time series analysis including exponential smoothing and the Box-Jenkins methods. The most appropriate forecasting model was selected from the two methods by considering the minimum of the mean absolute percentage error: MAPE. It was found that the Box-Jenkins is the most appropriate method to forecast both ethanol production and consumption. The forecasting results were then used to determine appropriate quantity and proportion of molasses and tapioca needed for ethanol production in the future.
Biodiesel Production From Crude Rubber Seed Oil Using Supercritical Methanol Transesterification
Authors: Sawiwat Thakun , Kajorncheappunngam Somjai
Published: August 2015

Synthesis of biodiesel from rubber seed oil using a supercritical methanol was investigated under various reaction conditions (220 - 300°C, 80 - 180 bar) with reaction time of 1-15 min and oil:methanol molar ratio of 1:20 - 1:60. Free fatty acid methyl esters (FAMEs) content were analyzed by gas chromatography-mass spectroscopy (GC-MS). Most properties of produced biodiesel were in good agreement with biodiesel standard (EN 14214). The maximum FAME yield of 86.90% was obtained at 260°C, 160 bar, 5 min reaction time using oil:methanol molar ratio of 1:40. The result showed the acid value of rubber seed oil decreased to 0.58 mgKOH/g from initial 24 mgKOH/g to. It could be concluded from this findings that crude rubber seed oil is a promising alternative raw material for biodiesel synthesis via supercritical methanol tranesterification.