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28,812 Article Results

Heat Response Model for Phase Layered Topology in A Photovoltaic Thermal System

10.11591/ijeecs.v7.i1.pp52-60
Mohammad Taghi Hajibeigy , Chockalingam Aravind Vaithilingam , Mushtak Al-atabi , PRP Hoole
The electrical and thermal energy generated by a Photo-voltaic (PV) module is based on the amount of the solar radiation directed on the PV module. In this study, a Photo-voltaic Thermal (PVT) system is constructed to maximize the electrical energy generation through the fast removal of heat through a new phase layered topology. The combinations of aluminum plate and heatsinks are used to transfer heat generated by sunlight radiation on PV modules to heat transfer thermal container. The aluminum plate is attached beneath the PV module and heatsinks welded beneath the alumni plate making it as a phase layered heat removal. The heat transfer on each layer of the photovoltaic thermal system is investigated with the phase changing topology and also investigated for its performance with a heat removal agent. In both cases, with and without water as coolant in the thermal container, the experimental outcome is analysed for performance analysis. It is found the PV temperature reduced by about 10 degrees which is cirtical for the PV performance reducing the wasted thermal energy and thereby increases the electrical energy conversion.
Volume: 7
Issue: 1
Page: 52-60
Publish at: 2017-07-01

A New Method of Voltage Flicker Detection for Hilbert Vibration Decomposition

10.11591/ijeecs.v7.i1.pp43-51
Tiejun Cao
Hilbert Vibration Decomposition (HVD) is introduced to the voltage flicker analysis. When voltage flicker accompanies with high order harmonics, the instantaneous frequency of its analytic signal in principle consists of two different parts, power frequency and a rapidly varying asymmetrical oscillating part. The important property of the instantaneous frequency offers a direct way to estimate the power frequency using a low-pass filter and remove the high order harmonics without pre-treatment procedures. Corresponding voltage flicker envelope is estimated using synchronous detection. The HVD method does not involves basic functions that the wavelet transform method needs. It can also adaptively estimate the frequency and amplitude of every modulation frequency component. Simulation results prove that the proposed method could accurately detect voltage flicker with high order harmonics. It has higher calculation efficiency and detection precision than wavelet transform method. Experimental results show that the new algorithm is feasible and efficient.
Volume: 7
Issue: 1
Page: 43-51
Publish at: 2017-07-01

Artificial Neural Network Based Fast Edge Detection Algorithm for MRI Medical Images

10.11591/ijeecs.v7.i1.pp123-130
Teddy Surya Gunawan , Iza Zayana Yaacob , Mira Kartiwi , Nanang Ismail , Nor Farahidah Za'bah , Hasmah Mansor
Currently, magnetic resonance imaging (MRI) has been utilized extensively to obtain high contrast medical image due to its safety which can be applied repetitively. Edges are represented as important contour features in the medical image since they are the boundaries where distinct intensity changes or discontinuities occur. Many traditional algorithms have been proposed to detect the edge, such as Canny, Sobel, Prewitt, Roberts, Zerocross, and Laplacian of Gaussian (LoG). Moreover, many researches have shown the potential of using Artificial Neural Network (ANN) for edge detection. Although many algorithms have been conducted on edge detection for medical images, however higher computational cost and subjective image quality could be further improved. Therefore, the objective of this paper is to develop a fast ANN based edge detection algorithm for MRI medical images. First, we developed features based on horizontal, vertical, and diagonal difference. Then, Canny edge detector will be used as the training output. Finally, optimized parameters will be obtained, including number of hidden layers and output threshold. Results showed that the proposed algorithm provided better image quality while it has faster processing time around three times time compared to other traditional algorithms, such as Sobel and Canny edge detector.
Volume: 7
Issue: 1
Page: 123-130
Publish at: 2017-07-01

Customized Hardware Crypto Engine for Wireless Sensor Networks

10.11591/ijeecs.v7.i1.pp263-275
Medhat Awadalla , Ahmed Al Maashri , Lavanya Pathuri , Afaq Ahmad
Nowadays, managing for optimal security to wireless sensor networks (WSNs) has emerged as an active research area. The challenging topics in this active research involve various issues such as energy consumption, routing algorithms, selection of sensors location according to a given premise, robustness, and efficiency. Despite the open problems in WSNs, already a high number of applications available shows the activeness of emerging research in this area. Through this paper, authors propose an alternative routing algorithmic approach that accelerate the existing algorithms in sense to develop a power-efficient crypto system to provide the desired level of security on a smaller footprint, while maintaining real-time performance and mapping them to customized hardware. To achieve this goal, the algorithms have been first analyzed and then profiled to recognize their computational structure that is to be mapped into hardware accelerators in platform of reconfigurable computing devices. An intensive set of experiments have been conducted and the obtained results show that the performance of the proposed architecture based on algorithms implementation outperforms the software implementation running on contemporary CPU in terms of the power consumption and throughput.
Volume: 7
Issue: 1
Page: 263-275
Publish at: 2017-07-01

Design and Simulation of a New ZVT Bi-directional DC-DC Converter for Electric Vehicles

10.11591/ijeecs.v7.i1.pp75-83
Rajesh Thumma , Veera Venkata Subrahmanya Kumar Bhajana , Pramo kumar Aylapogu
This paper presents a new zero voltage transistion (ZVT) bi-directional DC-DCconverter for energy storage system in DC traction. This bidirectional converter can transfers the power flow from low voltage side to high voltage side and viceversa. The conventional hard-switched non-isolated converter improved with the additional auxiliary cell to obtain zero voltage transition for the IGBTs. The main advantages of this topology are reduced the switching losses and improved the efficiency as well.The main aim of this converter is to achieve the operation of zero voltage transition during the commutation of main switches from off to on by utilizing auxiliary cell, which consist active and passive elements.The boost and buck modes of operations are achieved with the zero voltage transistion, which reduce the IGBTs current stresses and switching losses.This paper mainly describes the operation principles and the evaluation of the simulation results with the aid of Matlab simulations.The obtained results were proved the expected assumptions of the theoretical analysis.
Volume: 7
Issue: 1
Page: 75-83
Publish at: 2017-07-01

Distributed Optimal Relay Selection in Wireless Sensor Networks

10.11591/ijeecs.v7.i1.pp71-74
Karthik R , Nagaraju J , Mahendra Vucha
In wireless distributed sensor networks, one open problem is how to guarantee the reliable relay selection based on the quality of services diversity. To address this problem, we focus on the reliable adaptive relay selection approach and adaptive QoS supported algorithm, based on which we present a Markov chain model, in consideration of different packet states and error control algorithm assignment. The mathematical analyses and MATLAB simulation results show that the proposed relay selection approach could perform better in terms of saturation throughput, reliability, and energy efficiency, compared with the traditional approaches. More importantly, the quality of real-time multimedia streaming is improved significantly, in terms of decodable frame ratio and delay.
Volume: 7
Issue: 1
Page: 71-74
Publish at: 2017-07-01

An Empirical Performance Evaluation of Docker Container, Openstack Virtual Machine and Bare Metal Server

10.11591/ijeecs.v7.i1.pp205-213
Jyoti Shetty , Sahana Upadhaya , Rajarajeshwari H S , Shobha G , Jayant Chandra
Server virtualization is a fundamental technological innovation that is used extensively in IT enterprises. Server virtualization enables creation of multiple virtual machines on single underlying physical machine. It is realized either in form of hypervisors or containers. Hypervisor is an extra layer of abstraction between the hardware and virtual machines that emulates underlying hardware. In contrast, the more recent container-based virtualization technology runs on host kernel without additional layer of abstraction.Thus container technology is expected to provide near native performance compared to hypervisor based technology. We have conducted a series of experiments to measure and compare the performance of workloads over hypervisor based virtual machines, Docker containers and native bare metal machine. We use a standard benchmark workload suite that stress CPU, memory, disk IO and system. The results obtained show that Docker containers provide better or similar performance compared to traditional hypervisor based virtual machines in almost all the tests. However as expected the native system still provides the best performance as compared to either containers or hypervisors.
Volume: 7
Issue: 1
Page: 205-213
Publish at: 2017-07-01

Design of Remote Control Juvenile Healthy Smart Pillow

10.11591/ijeecs.v7.i1.pp97-106
Huadong Zhou , Xuran He , Jiaheng Yang , Lifan Liao
High-quality modern life results in many unique diseases of modern people, cervical spondylosis, sleep disorders. Adolescents lack of sleep have a negative impac on the students themselvest. Not only it will reduce the body resistance, prone to a variety of diseases, but also it make learning when the spirit is not concentrated, attention is decreased, thus affecting the learning state. Long-term lack of sleep will lead to psychological problems, a potential threat is formed to the physical and mental health of young people. To this end, based on WeChat platform, a young people's health intelligence pillow is designed, it can be remotely controned.
Volume: 7
Issue: 1
Page: 97-106
Publish at: 2017-07-01

A Miniaturized 878 MHz Slotted Meander Line Monopole Antenna

10.11591/ijeecs.v7.i1.pp170-177
Nabilah Ripin , Ahmad Asari Sulaiman , Nur Emileen Abd Rashid , Mohamad Fahmi Hussin , Nor Najwa Ismail
A slotted meander line printed monopole antenna for low frequency applications at 878 MHz is presented. The operating frequency of the conventional printed monopole antenna was greatly reduced by the presence of the slots and meander line which lead to the reduction of the antenna size. The size reduction up to 70% compared to the conventional reference antenna is achieved in this study. The antenna has a simple structure and small antenna size of 46.8 mm x 74 mm or 0.137𝝀0 x 0.217𝝀0. The antenna has been fabricated on the low-cost FR4 substrate and measured to validate the simulation performances. Measured results display that the proposed antenna produces omnidirectional radiation pattern of impedance bandwidth of 48.83 MHz and the maximum gain of -1.18 dBi.
Volume: 7
Issue: 1
Page: 170-177
Publish at: 2017-07-01

The Maximal SINR Selection Mode for 5G Millimeter-Wave MIMO: Model Systems and Analysis

10.11591/ijeecs.v7.i1.pp150-157
Dinh-Thuan Do , Duc-Anh Nguyen
In mmWave massive MIMO systems, the lens antenna array and beam selection by beamspace MIMO are employed to target the number of required RF chains reduced without obvious performance loss. For cost – effective, the number of RF chain is an allowable limitation, however, to obtain the near-optimal capacity efficiently, beam selection must require the exact information of the wide size of beamspace channel. Solution to this problem, in this paper we suggest analyzing whole beamspace based on maximal SINR. More specicfically, it is confirmed that the proposed beam selection algorithms achieve higher power efficiencies than a full system where all beams are employed.
Volume: 7
Issue: 1
Page: 150-157
Publish at: 2017-07-01

Towards Robust Non-Fragile Control in Wind Energy Engineering

10.11591/ijeecs.v7.i1.pp29-42
M. A. Ebrahim
Blade Pitch Controller (BPC) that can cope system uncertainties is one of the most interesting topics in wind energy engineering. Therefore, this paper presents a step towards the design of robust non-fragile BPC for wind energy conversion system. The proposed approach presents all boundaries of stability region that can guarantee robust stability (RS) over a wide range of operating conditions. The proposed technique results from the complementarity of both Root-Locus and Routh-Hurwitz (RL/RH) approach. Continuous variation in the operating conditions is tackled through a new hybrid control technique based on the referential integrity of both RL/RH and Kharitonov (Kh) theorem. Simulation results confirm the effectiveness of the proposed designing approach in computing the most resilient and robust controller.
Volume: 7
Issue: 1
Page: 29-42
Publish at: 2017-07-01

A Multi Output Formulation for Analog Circuits using MOM-SVM

10.11591/ijeecs.v7.i1.pp90-96
Shivalal Patro , Sushanta Kumar Mandal
This paper proposes performance based macro modeling of analog circuit using Multi Output Modeling (MOM) with the help of Support Vector Machine (SVM). SVM models the analog circuits and provides a relation between multi-input and multi-output parameters. In this work, Voltage Controlled Oscillator (VCO) is modeled as a test circuit which is designed in Cadence Virtuoso GPDK 45nm technology. From the Spice simulation results, the feasible dataset has been extracted from the complete dataset. Then, the VCO output frequency and phase noise is modeled by the width of the transistors which are the input parameters of the transistors. After tuning the model properly by k-cross validation method, the accuracy was found to be 96.1% which is good enough to make it use for the circuit synthesis purpose.
Volume: 7
Issue: 1
Page: 90-96
Publish at: 2017-07-01

Development of Photo Forensics Algorithm by Detecting Photoshop Manipulation using Error Level Analysis

10.11591/ijeecs.v7.i1.pp131-137
Teddy Surya Gunawan , Siti Amalina Mohammad Hanafiah , Mira Kartiwi , Nanang Ismail , Nor Farahidah Za'bah , Anis Nurashikin Nordin
Nowadays, image manipulation is common due to the availability of image processing software, such as Adobe Photoshop or GIMP. The original image captured by digital camera or smartphone normally is saved in the JPEG format due to its popularity. JPEG algorithm works on image grids, compressed independently, having size of 8x8 pixels. For unmodified image, all 8x8 grids should have a similar error level. For resaving operation, each block should degrade at approximately the same rate due to the introduction of similar amount of errors across the entire image. For modified image, the altered blocks should have higher error potential compred to the remaining part of the image. The objective of this paper is to develop a photo forensics algorithm which can detect any photo manipulation. The error level analysis (ELA) was further enhanced using vertical and horizontal histograms of ELA image to pinpoint the exact location of modification. Results showed that our proposed algorithm could identify successfully the modified image as well as showing the exact location of modifications.
Volume: 7
Issue: 1
Page: 131-137
Publish at: 2017-07-01

Estimation of Millimeter Wave Attenuation Due to Rain using 2D Video Distrometer Data in Malaysia

10.11591/ijeecs.v7.i1.pp164-169
Manhal Alhilali , Jafri Din , Michael Schönhuber , Hong Yin Lam
The increasing use of millimeter wave frequency bands requires a good understanding of the atmospheric channel. In equatorial regions, rain plays the central role in the impairment of millimeter wave propagation. Using large amounts of precise data collected by a two-dimensional video distrometer in Malaysia, the rain-specific attenuation of both vertically and horizontally polarized waves at the 38 GHz frequency was computed by applying the T-matrix technique. Good agreement is observed between these computations and fitted power law models from neighboring areas, but the ITU-R Recommendation P.838-3 significantly underestimates the rain-specific attenuation. The importance of including raindrop axial ratio in the calculation is revealed by differences among the local fitted coefficients for the vertically polarized estimations. The power law fit is provided, and the measurement is verified.
Volume: 7
Issue: 1
Page: 164-169
Publish at: 2017-07-01

Chemical by-Product Diagnostic Technique for Gas Insulated Switchgear Condition Monitoring

10.11591/ijeecs.v7.i1.pp18-28
Visa Musa Ibrahim , Zulkurnain Abdul-Malek , Nor Asiah Muhamad
Chemical by product diagnostic technique is an efficient, cost-effective and reliable diagnostic technique for gas insulate switchgear condition monitoring in view of its high sensitivity and anti- internal and external electromagnetic interference and noise. In this research paper, coaxial simulated gas insulated switchgear chamber and four different types of artificial defect were designed to cause partial discharge that will simulate the decomposition of sulphur hexafluoride gas in the chamber when energize. Fourier transform infrared spectrometer was used as the method of chemical by-product technique to detect the SF6 decomposition product and its concentration. Different numerous by-products were detected (SO2, SOF2, SO2F2, SO2F10, SiF4, CO, C3F8, C2F6 ) under this experiment using four different types of defect and the by-products differs with the type of defect and the generation rate. Gas insulated switchgear health condition can be feasibly diagnosed by analyzing the decomposition products of SF6 to identify its fault. 
Volume: 7
Issue: 1
Page: 18-28
Publish at: 2017-07-01
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