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25,002 Article Results

CNC Parametric Optimization for Exercise Equipment Parts Surface Roughness Using TRIZ

10.11591/ijeecs.v12.i12.pp8200-8204
Han-Chen Huang , Cheng-I Hou , Tian-Syung Lan
Product quality is the most important issue in the Computer Numerical Control (CNC) process. Hence, with exercise equipment parts Surface Roughness as the target, this study selected Spindle speed, Cutting depth, Feeding, and Tool runoff, as control parameters in CNC parametric optimization of target quality. By using the Theory of Inventive Problem Solving (TRIZ) to define the Cause and Effect relationship and conflicting points, this study quickly identified an optimal solution, according to TRIZ, and determined factor relevance by cutting control parameters. By the 40 Inventive Principles of TRIZ corresponding to Contradiction Matrix, we obtained the Surface Roughness optimization strategy. The empirical research results suggest that Surface Roughness can actually be improved under the optimal parameter combination. The effectiveness and practicality of the proposed method are verified.
Volume: 12
Issue: 12
Page: 8200-8204
Publish at: 2014-12-01

Learning Style Classification via EEG Sub-band Spectral Centroid Frequency Features

https://ijece.iaescore.com/index.php/IJECE/article/view/5513
Megat Syahirul Amin Megat Ali , Aisyah Hartini Jahidin , Nooritawati Md Tahir , Mohd Nasir Taib
Kolb’s Experiential Learning Theory postulates that in learning, knowledge is created by the learners’ ability to absorb and transform experience. Many studies have previously suggested that at rest, the brain emits signatures that can be associated with cognitive and behavioural patterns. Hence, the study attempts to characterise and classify learning styles from EEG using the spectral centroid frequency features. Initially, learning style of 68 university students has been assessed using Kolb’s Learning Style Inventory. Resting EEG is then recorded from the prefrontal cortex. Next, the EEG is pre-processed and filtered into alpha and theta sub-bands in which the spectral centroid frequencies are computed from the corresponding power spectral densities. The dataset is further enhanced to 160 samples via synthetic EEG. The obtained features are then used as input to the k-nearest neighbour classifier that is incorporated with k-fold cross-validation. Feature classification via k-nearest neighbour has attained five-fold mean training and testing accuracies of 100% and 97.5%, respectively. Hence, results show that the alpha and theta spectral centroid frequencies represent distinct and stable EEG signature to distinguish learning styles from the resting brain.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6833
Volume: 4
Issue: 6
Page: 931-938
Publish at: 2014-12-01

Stability Analysis of DC-link Voltage Control on Autonomous Micro Hydro Power Plant System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5023
Feri Yusivar , M. Shanizal , A. Subiantoro , R. Gunawan
Micro Hydro Power Plant has become one of the interesting topics to be researched nowadays. This paper deals with the stability analysis on control system of excitation voltage in Micro Hydro Power Plant. The control of this voltage can be achieved by controlling the Permanent Magnet Synchronous Machine (PMSM) with particular algorithm so the voltage on the DC-link part of the system can be controlled. Without knowing the exact specification of system parameters, the system will be most likely unstable. The DC-link control system is modeled, simulated, and mathematically analyzed so the parameter specification for the stable system can be obtained.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6436
Volume: 4
Issue: 4
Page: 499-507
Publish at: 2014-12-01

Performance Analysis of No Reference Image quality based on Human Perception

https://ijece.iaescore.com/index.php/IJECE/article/view/5517
Subrahmanyam CH , D. Venkata Rao , N. Usha Rani
In this work, a No-Reference objective image quality assessment based on NRDPF-IQA metric and classification based metric are tested using LIVE database, which consisting of Gaussian white noise, Gaussian blur, Rayleigh fast fading channel, JPEG compressed images, JPEG2000 images. We plot the Spearman’s Rank Order Correlation Coefficient [SROCC] between each of these features and human DMOS from the LIVE-IQA database using our proposed method to ascertain how well the features correlate with human judgement quality. The analysis of the testing and training is done by SVM model. The proposed method shows better results compared with the earlier methods. Finally, the results are generated by using MATLAB.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6783
Volume: 4
Issue: 6
Page: 939-943
Publish at: 2014-12-01

Particle Swarm Optimization with a Simulated Binary Crossover Operator

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3947
Lei Yang , Caixia Yang , Yu Liu
Particle swarm optimization (PSO) is a new intelligent search technique, which is inspired by swarm intelligence. Although PSO has shown good performance in many benchmark optimization problems, it suffers from premature convergence in solving complex multimodal problems. In this paper, we propose a novel PSO algorithm, called PSO with a simulated binary crossover operator (SCPSO), to improve the performance of PSO. Experimental results on several benchmark problems show that SCPSO achieves better performance than standard PSO. http://dx.doi.org/10.11591/telkomnika.v12i12.5999 
Volume: 12
Issue: 12
Page: 8286-8291
Publish at: 2014-12-01

Application of Distribution Power Electronic Transformer for Medium Voltage

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5028
Prashant Kumar
In   this   paper   a   distribution   power electronic transformer (DPET) for feeding critical loads is presented. The PE based transformer is a multi-port converter that can connect to medium voltage levels on the primary side. Bidirectional power flow is provided to the each module. The presented structure consists of three stages: an input stage, an isolation stage, and an output stage.  The input current is sinusoidal, and it converts the high AC input voltage to low DC voltages. The isolated DC/DC converters are then connected to the DC links and provide galvanic isolation between the HV and LV sides. Finally, a three-phase inverter generates the AC output with the desired amplitude and frequency. The proposed DPET is extremely modular and can be extended for different voltage and power levels. It performs typical functions and has advantages such as power factor correction, elimination of voltage sag and swell, and reduction of voltage flicker in load side. Also in comparison to conventional transformers, it has lower weight, lower volume and eliminates necessity for toxic dielectric coolants the DPET performance is verified in MATLAB simulation.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6395
Volume: 4
Issue: 4
Page: 547-556
Publish at: 2014-12-01

New Research on MEMS Acoustic Vector Sensor Used in ground Marker of Pipeline

10.11591/ijeecs.v12.i12.pp8126-8132
Mengran Liu , Guojun Zhang , Zeming Jian , Hong Liu , Xiaopeng Song , Wendong Zhang
Recently, ground marker based on the principle of acoustic detection has become the trend of pipeline technology. As to the difficulty and low accuracy of ground marker, this paper introduces a new MEMS bionic acoustic vector sensor with high sensitivity, good performance in low frequency and lower power. As to the problem of the port/starboard blur of this vector sensor in ground marking, it proposes a new plan and proves the correctness of the plan through theoretic analysis and experimental verification. The results show that the mean error of the directional angle is within 5 degree meeting the needs of the engineering project.
Volume: 12
Issue: 12
Page: 8126-8132
Publish at: 2014-12-01

Bidirectional Luo Converter Fed Switched Reluctance Motor

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3927
R. Balamurugan , M. Vishvanath
The present work aims at designing and modelling of a bidirectional DC-DC LUO converter for driving a Switched Reluctance Motor. LUO converters are new series of DC/DC Converters that have very low ripple of voltage and current and have output wave with high quality, high power density and high transfer voltage gain and don’t have circuit elements parasitic limits of traditional converters. LUO converters have very high voltage transfer gains in geometric progression on stage by-stage. A C- Dump converter is used to drive the SRM drive. The present design aims at improving the efficiency of the Switched Reluctance Motor drive system by the incorporation of the bidirectional DC-DC LUO converter between the electrical source and the drive system.  http://dx.doi.org/10.11591/telkomnika.v12i12.6883 
Volume: 12
Issue: 12
Page: 8120-8125
Publish at: 2014-12-01

Circularly Polarized Cylindrical Dielectric Resonator Antenna with Different Shapes Cross Slot

https://ijece.iaescore.com/index.php/IJECE/article/view/5529
Zahra Rahimian
A cross slot coupled cylindrical dielectric resonator antenna (CDRA) operating in the X-band (8GHz -12GHz) frequency range is studied. The proposed CP designs are achieved by implementing a suitable cross slot on the ground plane (in the case of aperture coupled feed method), which results in excitation of two near degenerate orthogonal modes of near equal amplitudes and 90°phase difference. Attempts are made to change the geometry of slots ends to introduce a novel structure in order to achieve a better impedance bandwidth with an improved 3dB axial ratio (AR) bandwidth. It is found that the hourglass of cross slot has a great effect on the strength of coupling between the feed line and the dielectric resonator antenna. In simulation an impedance bandwidth of 46.15% and axial ratio bandwidth of 22% has been achieved with the above geometry. An improvement of 12% in impedance bandwidth and 11.2% in Axial ratio bandwidth is obtained over conventional rectangular cross slot.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6484
Volume: 4
Issue: 6
Page: 974-978
Publish at: 2014-12-01

Performance Indices Based Optimal Tunning Criterion for Speed Control of DC Drives Using GA

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5019
Deepti Singh , Brijesh Singh , Nitin Singh
This paper presents a framework to carry out a simulation to tune the speed controller gains for known input of DC drive system. The objective is to find the optimal controller gains (proportional and integral) in a closed loop system. Various performance indices have been considered as optimal criterion in this work. The optimal gain values have been obtained by conventional and Genetic Algorithm (GA) based optimization methods. The study has been conducted on a simulink model of three phase converter controlled direct current (DC) drive with current and speed control strategy. The results show that the GA based tunning provided better solutions as compared to conventional optimization methods based tunning.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6334
Volume: 4
Issue: 4
Page: 461-473
Publish at: 2014-12-01

A Compact SIW Mixer For Millimeter-Wave Applications

https://ijece.iaescore.com/index.php/IJECE/article/view/5506
Abdelkhalek Nasri , Hassen Zairi , Ali Gharsallah
The present paper highlights an innovative broadband millimeter-wave single balanced diode mixer which is designed using a newly designed 90 substrate integrated waveguide (SIW) coupler and two cavity (SIW) filters. The mixer covers RF/LO operating frequency range which fluctuates between 10 to 12 GHz and IF port covers 2GHz. The proposed mixer exhibits a fairly low conversion loss of less than 10 dB and high port to-port isolations over the frequency band of interest as the simulated results make clear. Furthermore, the two cavities SIW filter is embedded to achieve a better image frequency suppression of about 28dB.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6684
Volume: 4
Issue: 6
Page: 902-908
Publish at: 2014-12-01

New Structure for Photovoltaic Systems with Maximum Power Point Tracking Ability

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5022
Mostafa Barzegar Kalashani , Murtaza Farsadi
This paper proposes a new structure for photovoltaic (PV) arrays with a new inverter topology. A quasi-Z-Source DC-DC Converter (qZSC) with capability of dividing its output voltage to the same voltages and tracking maximum power point is proposed. The Proportional-Integral Incremental Conductance (PI-IncCond) method is used for maximum power point tracking (MPPT). Description of proposed structure along with detailed simulation results that verify its feasibility are given to demonstrate the availability of the proposed system by MATLAB/Simulink software.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6365
Volume: 4
Issue: 4
Page: 489-498
Publish at: 2014-12-01

Modeling and Simulation of Grid Interfaced Synchronous Generator with Controller

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3924
S. Sridharan , N. Manonmani
The increasing demand of electric power necessitates the establishment of new generating stations. Wind energy conversion system (WECS) is more attractive due to its mature and clean aspects. The wind turbine driven with permanent magnet synchronous generator (PMSG) feeds ac power to utility grid. For this purpose two voltage source converters are connected back to back between rotor terminals and grid via common dc link. In order to satisfy the grid code requirements such as grid stability, power quality improvement, and power control this machine is usually used. In this paper the complete mathematical modelling and simulation of wind turbine driven PMSG has been done. The stator and rotor of PMSG is connected to the grid  through back to back connected two voltage source converters with a common DC link. The total system is modeled and simulated for better power quality and is capable of harnessing maximum power at various wind speeds. A new control strategy known as perturb and observation (P&O) controller is introduced in WECS for maximum power point tracking (MPPT) to improve the system operation. The simulation is done in MATLAB Simulink environment.  http://dx.doi.org/10.11591/telkomnika.v12i12.6884 
Volume: 12
Issue: 12
Page: 8098-8103
Publish at: 2014-12-01

A New Procedure to Detect Low Interaction Honeypots

https://ijece.iaescore.com/index.php/IJECE/article/view/5543
Eleazar Aguirre-Anaya , Gina Gallegos-Garcia , Nicolás Solano Luna , Luis Alfonso Villa Vargas
Honeypots  systems  are   an   important  piece  of   the   network  security infrastructure and can be deployed to accomplish different purposes such as: network sensing, capturing and learning about 0-day exploits, capturing and analyzing of black hat techniques, deterring black hats and data gathering for doing  statistical  analysis  over  the  Internet  traffic,  among  others. Nevertheless, all honeypots need to look like real systems, due to if a honeypot is unmasked, it loses its value. This paper presents a new procedure to detect low interaction honeypots, through HTTP request, regardless honeypot architecture. It is important to mention that Low Interaction Honeypots network services need to be improved in order to get trustworthy information. Otherwise, it should consider data obtained by low interaction honeypots like inaccurate and unreliable information.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6885
Volume: 4
Issue: 6
Page: 848-857
Publish at: 2014-12-01

Study on the Evaluation Ability of Personalized Information Service of Higher Vocational Library

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3951
XinJuan Zhou , Meiying Nie
Higher vocational library personalized service, refers to the user's preferences, habits, such as unique requirements for information services, it is aimed at higher vocational teachers and students in the teaching, scientific research and the different needs of a corresponding type of service. The root of the individualized service is to respect the user, the user's behavior and habits, for the user to select more important resources and provide the more thoughtful service characteristics. From constructing the high vocational school library personalized service guarantee system, perfecting the high vocational school library personalized service content and construct the high vocational school library personalized service interaction mechanism to promote higher vocational library personalized information service to improve efficiency. In the final analysis, the high vocational school library personalized information service ability evaluation of first and second index, the result is satisfactory. http://dx.doi.org/10.11591/telkomnika.v12i12.4893 
Volume: 12
Issue: 12
Page: 8319-8325
Publish at: 2014-12-01
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