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31,456 Article Results

Convergence analysis of the unpunctured turbo trellis-coded modulation (UTTCM)

10.11591/ijeecs.v13.i2.pp447-452
Ahmed Haffane , Abdelhafid Hasni , Mustapha Khelifi , Boufeldja Kadri
In this paper, the performance of the Unpunctured Turbo Trellis-Coded Modulation (UTTCM) over Additive White Gaussian Noise (AWGN) channel is analyzed using the non-binary extrinsic information transfer (EXIT) chart. The exchange of the extrinsic information between the decoder components is tracked, allowing the generation of an EXIT chart, which is a powerful tool for analyzing the convergence behavior of iterative decoding and prediction of convergence position. The Simulation results are compared with the turbo cliff positions on the BER curves.
Volume: 13
Issue: 2
Page: 447-452
Publish at: 2019-02-01

A comparative approach between different optimize result in hybrid energy system using HOMER

10.11591/ijece.v9i1.pp141-147
Shweta Goyal , Sachin Mishra , Anamika Bhatia
To compare the different result of optimization of a hybrid energy system. A hybrid renewable energy system (HRES) is the combination of renewable and non-renewable sources which is playing a very important role for rural area electrification when grid extension is not possible or excessively expensive. Non renewable sources like diesel power generator (optional) are used in a HRES for backup when renewable energy supply is not sufficient. While the HRES is very important due to the smallest natural and physical contact compared to non renewable sources, this work proposed a comparison outcome with the help of different component by using HOMER software and get best optimize result for the model. This paper presents a wide-ranging review of various aspects of HRES. This paper discusses study, best sizing, and model, organize aspect and reliability issue.
Volume: 9
Issue: 1
Page: 141-147
Publish at: 2019-02-01

Handwritten tifinagh character recognition using simple geometric shapes and graphs

10.11591/ijeecs.v13.i2.pp598-605
Youssef Ouadid , Abderrahmane Elbalaoui , Mehdi Boutaounte , Mohamed Fakir , Brahim Minaoui
In this paper, a graph based handwritten Tifinagh character recognition system is presented. In preprocessing Zhang Suen algorithm is enhanced. In features extraction, a novel key point extraction algorithm is presented. Images are then represented by adjacency matrices defining graphs where nodes represent feature points extracted by a novel algorithm. These graphs are classified using a graph matching method. Experimental results are obtained using two databases to test the effectiveness. The system shows good results in terms of recognition rate.
Volume: 13
Issue: 2
Page: 598-605
Publish at: 2019-02-01

Classification improvement of spoken arabic language based on radial basis function

10.11591/ijece.v9i1.pp402-408
Thamir Rashed Saeed , Jabar Salman , Alaa Hussein Ali
The important task in the computer interaction is the languages recognition and classification. In the Arab world, there is a persistent need for the Arabic spoken language recognition To help those who have lost the upper parties in doing what they want through speech computer interaction. While, the Arabic automatic speech recognition (AASR) did not receive the desired attention from the researchers. In this paper, the Radial Basis Function(RBF) is used for the improvement of the Arabic spoken language letter. The recognition and classification process are based on three steps; these are; preprocessing, feature extraction and classification (Recognition). The Arabic  Language Letters  (ALL) recognition is done by using the combination between the statistical features and the Temporal Radial Basis Function for different letter situation and noisy condition. The recognition percent are from 90% - 99.375% has been gained with independent speaker, where these results are over-perform the earlier works by nearly 2.045%. The simulati.on has been made by using Matlab 2015b.
Volume: 9
Issue: 1
Page: 402-408
Publish at: 2019-02-01

Voltage sensitivity analysis to determine the optimal integration of distributed generation in distribution systems

10.11591/ijece.v9i1.pp55-65
Katherine Cabana , John Candelo , Rafael Castillo , Emiro De la Hoz Franco
This paper presents a voltage sensitivity analysis with respect to the real power injected with renewable energies to determine the optimal integration of distributed generation (DG) in distribution systems (DS). The best nodes where the power injections improve voltages magnitudes complying with the constraints are determined. As it is a combinatorial problem, particle swarm optimization (PSO) and simulated annealing (SA) were used to change injections from 10% to 60% of the total power load using solar and wind generators and find the candidate nodes for installing power sources. The method was tested using the 33-node, 69-node and 118-node radial distribution networks. The results showed that the best nodes for injecting real power with renewable energies were selected for the distribution network by using the voltage sensitivity analysis. Algorithms found the best nodes for the three radial distribution networks with similar values in the maximum injection of real power, suggesting that this value maintains for all the power system cases. The injections applied to the different nodes showed that voltage magnitudes increase significantly, especially when exceeding the maximum penetration of DG. The test showed that some nodes support injections up to the limits, but the voltages increase considerably on all nodes.
Volume: 9
Issue: 1
Page: 55-65
Publish at: 2019-02-01

Reflection phase analysis of reflectarray antenna based on paper substrate materials

10.11591/ijeecs.v13.i2.pp766-772
H. I Malik , M. Y. Ismail , S. R Masrol , Sharmiza Adnan
This article presents an analysis of reflection loss and reflection phase behavior of a novel microstrip reflectarray antenna, embedded on paper substrate material. Two different paper substrates were first analyzed for dielectric material properties. A detailed analysis of scattering parameters of rectangular patch element with variable substrate heights has been carried out. Rectangular patch elements fabricated using adhesive copper tape over the paper substrate, show that a wide bandwidth is achieved compared to available conventional substrate materials. Fabricated patch elements over paper substrate material show a broadband frequency response of 340 and 290 MHz. It has also been demonstrated that the measured reflection phase ranges for both the substrate cover 310º and 294º at low phase gradients of 0.12 and 0.24 º/MHz respectively.
Volume: 13
Issue: 2
Page: 766-772
Publish at: 2019-02-01

Bistatic configurational analysis of ultra-wideband antenna for detection applications

10.11591/ijeecs.v13.i2.pp702-707
Jawab Ali , Noorsaliza Abdullah , Roshayati Yahya , Ezri Mohd , Ariffuddin Joret , Norshidah Katiran
With the advancement in technology, antennae are becoming a popular components to be used in various applications. Following the trend, a compact design of ultra-wideband (UWB) bistatic configuration of the antenna is presented in this paper using ground penetrating radar (GPR) technology specifically for detection applications. The antenna is first designed and simulated using defected ground structure (DGS) for impedance bandwidth with the obtained gain of around 6.2 dB and return losses from 3-16 GHz. Later the complete detection model is aimed to study and for this purpose CST is used to model human skin and performed an experiment based on antennas i.e. transmitter and receiver, obstacle and target, to study and analyze the received antenna reflections for detection purpose.
Volume: 13
Issue: 2
Page: 702-707
Publish at: 2019-02-01

Wind direction sensor based on thermal anemometer for olfactory mobile robot

10.11591/ijeecs.v13.i2.pp475-484
Helmy Widyantara , Muhammad Rivai , Djoko Purwanto
A wind direction sensor has been implemented for many applications, such as navigation, weather, and air pollution monitoring. In an odor tracking system, the wind plays the important role to carry gas from its source. Therefore, the precise, low-cost, and effective wind direction sensor is required to trace the gas source. In this study, a new design of wind direction sensor has been developed using thermal anemometer principle with the main component of the positive temperature coefficient thermistor. Three anemometers each of which has different directions are used as inputs for the neural network to determine the direction of the wind automatically.The experimental results show that the wind sensor system is able to detect twelve wind directions. A mobile robot equipped with this sensor system can navigate to a wind source in the open air with a success rate of 80%.This system is expected to increase the success rate of the mobile robot in searching for dangerous leaking gas in the open air.
Volume: 13
Issue: 2
Page: 475-484
Publish at: 2019-02-01

Quartz crystal microbalance based electronic nose system implemented on Field Programmable Gate Array

10.12928/telkomnika.v17i1.10133
Misbah; Institut Teknologi Sepuluh Nopember Misbah , Muhammad; Institut Teknologi Sepuluh Nopember Rivai , Fredy; Institut Teknologi Sepuluh Nopember Kurniawan
Nowadays, an electronic nose becomes an important tool for detecting gas. The electronic nose consists of gas sensor array combined with neural networks to recognize patterns of the sensor array. Currently, the implementation of the neural network on the electronic nose systems still use personal computer so that less flexible or not portable. This paper discusses the electronic nose system implemented in a Field Programmable Gate Array (FPGA). The sensor array consists of eight Quartz Crystal Microbalance (QCM) coated with chemical materials. The eight channel-frequency counter is used to measure the frequency change of the sensor due to the presence of gas adsorbed to the surfaces. The bipolar sigmoid activation function used in the neuron model is approximated by a second order equation. The experimental result showed that the electronic nose system could recognize all the types of gas with 92% success rate.
Volume: 17
Issue: 1
Page: 370-376
Publish at: 2019-02-01

High secure buffer based physical unclonable functions (PUF’s) for device authentication

10.12928/telkomnika.v17i1.10436
Sadulla; Vignan's Foundation for Science Shaik , Anil Kumar; Vignan's Foundation for Science Kurra , A.; Vignan's Foundation for Science Surendar
Physical Unclonable Function (PUF) is fast growing technology which utilizes the statistical variability of the manufacture variations acts as a finger print to the each device. It can be widely used in security applications such as device authentication, key generation and Intellectual Property (IP) protection. Due to the simplicity and low cost arbiter delay based PUFs have been mostly used as a cryptographic key in Internet of Things (IoT) devices. As conventional arbiter PUFs are suffers from less uniqueness and reliability. This paper provides designing of new buffer based arbiter PUF. It has been demonstrated that experimental results of new buffer based arbiter PUF shows the considerable improvement in the uniqueness and reliability of the proposed design and the Monte-Carlo analysis applied for delay variability of the PUFs.
Volume: 17
Issue: 1
Page: 377-383
Publish at: 2019-02-01

Radiation pattern control of microstrip antenna in elevation and azimuth planes using EBG and pin diode.

10.11591/ijece.v9i1.pp332-340
M. K Abdulhameed , M. S. Mohamad Isa , Z. Zakaria , I.M. Ibrahim , Mowafak K. Mohsen
An important issue in wireless communication systems, which is related to the antenna gain degradation in case of changing the main direction of the antenna radiation pattern, this variation is not approval in many communications systems. In order to improve antenna radiation performances, Electromagnetic band gap (EBG) - antenna with radiation pattern control capability is presented. Mushroom-like EBG structure for suppressing surface waves has been combined, with the switching diode to produce the radiation pattern control with improving antenna characteristics of gain, directivity and efficiency. EBG of several cells are surrounded the patch antenna and placed symmetrically for the two opposite sides, generating different radiation patterns control ability in both the elevation (E) (-20° < φ < 20°) and azimuth (Z) planes (−18° < θ < 18°). At the ground plane of antenna the diodes have been switched ON and OFF states, the EBG sector properties in stop band (connecting vias) and pass band (disconnecting vias) are altered. Using CST Microwave Studio (CST MWS) the results show the flexibility in radiation pattern control for the Z and E planes using only four diodes. Antenna directivity of 10 dBi, gain 9.86 dB and efficiency 96.5% at the operating frequency of 6 GHz, more results for all direction has been stated in Table1. Significantly, unlike a conventional beam steering, this method does not suffering from gain degradation and the main lobe gain is approximately constant for all steerig angles.
Volume: 9
Issue: 1
Page: 332-340
Publish at: 2019-02-01

Implementation of an ARM-based system using a Xilinx ZYNQ SoC

10.11591/ijeecs.v13.i2.pp485-491
Omar Salem Baans , Asral Bahari Jambek
ARM processors are widely used in embedded systems. They are often implemented as microcontrollers, field-programmable gate arrays (FPGAs) or systems-on-chip. In this paper, a variety of ARM processor platform implementations are reviewed, such as implementation into a microcontroller, a system-on-chip and a hybrid ARM-FPGA platform. Furthermore, the implementation of a specific ARM processor, the Cortex-A9 processor, into a system-on-chip (SoC) on an FPGA is discussed using Xilinx’s Vivado and SDK software system and execution on a Xilinx Zynq Board.
Volume: 13
Issue: 2
Page: 485-491
Publish at: 2019-02-01

The use of mobile-assisted virtual reality in fear of darkness therapy

10.12928/telkomnika.v17i1.11614
Erick; Universitas Padjadjaran Paulus , Mira; Universitas Padjadjaran Suryani , Puspita Adhi Kusuma; Universitas Padjadjaran Wijayanti , Firdaus Perdana; Universitas Padjadjaran Yusuf , Aulia; Universitas Padjadjaran Iskandarsyah
Fear of darkness is a common psychological problem that may extent to a specific phobia if it is not treated well. Several intervention techniques related to fear and phobia using actual exposure therapy have been studied for decades, however, there were some constraints emerged when the therapist provides a real environment to overcome the patient's reaction to his/her specific fear. Virtual reality (VR) technology is an innovative tool providing a more immersive, secure, personal, and controlled virtual environment. Therefore, we developed a novel framework for treating the fear of darkness named Mobile-assisted Virtual Reality (MAVR). The purpose of this study was to evaluate the use of MAVR to treat fear of darkness based on usability, time consumption and its ability to decrease fear. We used the GOMS model as an interaction guidance between human and computer which aimed to facilitate the process of re-learning in mindset change and individual’s behavioral toward situation of darkness and night. Therefore, a comprehensive evaluation was conducted to measure the efficacy of the MAVR. We developed the usability assessment checklist to assess the feasibility and acceptability of the MAVR, and fear of darkness thermometer to measure the degree of fear. The Wilcoxon Signed Rank Test showed that the fear of darkness was significantly decreased after participants received the MAVR therapy (z=-3.550, p-value<0.001). We found that the MAVR was very useful, easy to be used and acceptable for participants. In conclusion, this study highlights the efficacy of Mobile-assisted Virtual Reality in treating specific fear, and it seems that Virtual Reality technology has a promising benefit to be implemented for other fear or specific phobia and also used in other psychological treatment.
Volume: 17
Issue: 1
Page: 282-290
Publish at: 2019-02-01

Evaluation of network security based on next generation intrusion prevention system

10.12928/telkomnika.v17i1.9191
Gilang Intan Permatasari; Bina Nusantara University Duppa , Nico; Bina Nusantara University Surantha
Next Generation Intrusion Prevention System (NGIPS) is a system that works to monitor network traffic, to detect suspicious activity, and to conduct early prevention toward intrusion that can cause network does not run as it supposed to be, NGIPS provides vulnerability protection broader compared to the traditional IPS, especially in the application layer that has ability to detect and learn vulnerability asset and carried out layering inspection until layer 7 packet. This paper intended to analyze and evaluate the NGIPS to protect network from penetration system that utilize the weakness from firewall, that is exploitation to HTTP port. By the existence of NGIPS, it is expected can improve the network security, also network administrator could monitor and detect the threats rapidly. Research method includes scenario and topology penetration testing plan. The result of this research is the evaluation of penetration testing that utilizes HTTP port to exploit through malicious domain. The evaluation conducted to ensure the NGIPS system can secure the network environment through penetration testing. This study can be concluded that it can become reference to optimize network security with NGIPS as network security layer.
Volume: 17
Issue: 1
Page: 39-48
Publish at: 2019-02-01

A-OLSR: ANFIS based OLSR to select Multi point relay

10.11591/ijece.v9i1.pp646-651
Vivek Sharma , Bashir Alam , M. N. Doja
The characteristics like dynamic topology, power consumption, mobility etc. may leads to affect the routing process of packet as it progresses from one node to another node. The energy of each node is very limited in MANET’s due to which it becomes an important parameter to be considered while selecting the route. The ‘Optimized Link State Routing Protocol’ (OLSR) does not consider node energy during Multipoint relay (MPR) selection process. This paper proposes an improvement of OLSR routing protocol named as A-OLSR protocol using node energy during its MPR process. The improvement is based on adaptive neuro fuzzy inference system (ANFIS). The network simulator NS2.35 is used for the simulation, random way point model for mobility and constant bit rate (CBR) for traffic process. The performance of proposed A-OLSR protocol is evaluated using the packet delivery ratio (PDR) and end to end delay metrices. The simulation results prove the superiority of the proposed protocol in terms of PDR.
Volume: 9
Issue: 1
Page: 646-651
Publish at: 2019-02-01
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