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28,451 Article Results

Interleaved reception method for restored vector quantization image

10.12928/telkomnika.v14i4.3181
Iman; Tahri Mohammed University Elawady , Abdelmounaim; Tahri Mohammed University Moulay Lakhdar , Mustapha; Tahri Mohammed University Khelifi
The transmission of image compression by vector quantization produce wrong blocks in received image which are completely different to the original one that makes the restoration process too hard because we don’t have any information about the original blocks. As a solution of this problem we try to keep the maximum of pixels that form the original block by building new blocks. Our proposition is based on decomposition and interleaving. For the simulation we use a binary symmetric channel with different BER and in the restoration process we use simple median filter just to check the efficiency of proposed approach.
Volume: 14
Issue: 4
Page: 1362-1367
Publish at: 2016-12-01

Non-binary LDPC Decoder Design over Rayleigh Channel for FPGA Implementation

10.12928/telkomnika.v14i4.4157
Zhongxun; Yantai University Wang , Juan; Yantai University Hui
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexLow Density Parity Check Code（LDPC） is a kind of linear block codes based on sparse check matrix. As a kind of channel coding, whose error performance approach Shannon limits, it has better error correction capability, more flexible structure and lower decoding complexity. Currently most of the LDPC code researches are on the premise of the AWGN channel and BSC channel, which mainly in the range of the binary LDPC codes. According to the above problem, this paper analyzes the various decoding performance of non-binary LDPC codes in Rayleigh channel, and realizes a non-binary LDPC decoder in Rayleigh channel through the FPGA design. The paper begins with an overall discussion of issues surrounding the use of non-binary LDPC codes. And then the bit-error-rate (BER) performances of different non-binary LDPC codes decoding algorithm are compared on the independent Rayleigh fading channel. Finally, this decoder design is implemented based on 5CSEMA5F31C6 FPGA (devised by Altera Company) to illustrate the concepts discussed in the paper.
Volume: 14
Issue: 4
Page: 1376-1382
Publish at: 2016-12-01

An Optimized Model for MapReduce Based on Hadoop

10.12928/telkomnika.v14i4.3606
Zhang; Lanzhou University of Technology Hong , Wang; Lanzhou University of Technology Xiao-ming , Cao; Lanzhou University of Technology Jie , Ma; State Grid Gansu Electric Company Yan-hong , Guo; Lanzhou University of Technology Yi-rong , Wang; Lanzhou University of Technology Min
Aiming at the waste of computing resources resulting from sequential control of running mechanism of MapReduce model on Hadoop platform，Fork/Join framework has been introduced into this model to make full use of CPU resource of each node. From the perspective of fine-grained parallel data processing, combined with Fork/Join framework，a parallel and multi-thread model，this paper optimizes MapReduce model and puts forward a MapReduce+Fork/Join programming model which is a distributed and parallel architecture combined with coarse-grained and fine-grained on Hadoop platform to Support two-tier levels of parallelism architecture both in shared and distributed memory machines. A test is made under the environment of Hadoop cluster composed of four nodes. And the experimental results prove that this model really can improve performance and efficiency of the whole system and it is not only suitable for handling tasks with data intensive but also tasks with computing intensive. it is an effective optimization and improvement to the MapReduce model of big data processing.
Volume: 14
Issue: 4
Page: 1552-1558
Publish at: 2016-12-01

The Strategies for Quorum Satisfaction in Host-to-Host Meeting Scheduling Negotiation

10.12928/telkomnika.v14i4.4521
Rani; Departemen Pendidikan Ilmu Komputer FPMIPA Universitas Pendidikan Indonesia Megasari , Kuspriyanto; Institut Teknologi Bandung Kuspriyanto , Emir Mauludi; Institut Teknologi Bandung Husni , Dwi Hendratmo; Institut Teknologi Bandung Widyantoro
This paper proposes two strategies for handling conflict schedule of two meetings which invite the same member of personnel at the same time through host-to-host negotiation scheme. The strategy is to let the member attend the other meeting under the condition that the group decision regarding the schedule is not changed and meeting quorum is fulfilled, namely release strategy. Other strategy is to substitute the absent personnel in order to keep the number of attendees above the quorum, namely substitute strategy. This paper adapts a mechanism design approach, namely Clarke Tax Mechanism, to satisfy incentive compatibility and individual rationality principal in meeting scheduling. By using a release strategy and substitute strategy, colliding meetings can still be held according to the schedule without the need for rescheduling. This paper shows the simulation result of using the strategies within some scenarios. It demonstrates that the number of meeting failures can be reduced with negotiation.        
Volume: 14
Issue: 4
Page: 1598-1607
Publish at: 2016-12-01

Clustering Large Data with Mixed Values Using Extended Fuzzy Adaptive Resonance Theory

10.11591/ijeecs.v4.i3.pp617-628
Asadi Srinivasulu , Gadupudi Dakshayani
Clustering is one of the technique or approach in content mining and it is used for grouping similar items. Clustering software datasets with mixed values is a major challenge in clustering applications. The previous work deals with unsupervised feature learning techniques such as k-Means and C-Means which cannot be able to process the mixed type of data. There are several drawbacks in the previous work such as cluster tendency, partitioning, less accuracy and less performance. To overcome all those problems the extended fuzzy adaptive resonance theory (EFART) came into existence which indicates that the usage of fuzzy ART with some traditional approach. This work deals with mixed type of data by applying unsupervised feature learning for achieving the sparse representation to make it easier for clustering algorithms to separate the data. The advantages of extended fuzzy adaptive resonance theory are high accuracy, high performance, good partitioning, and good cluster tendency. This EFART adopts unsupervised feature learning which helps to cluster the large data sets like the teaching assistant evaluation, iris and the wine datasets. Finally, the obtained results may consist of clusters which are formed based on the similarity of their attribute type and values.
Volume: 4
Issue: 3
Page: 617-628
Publish at: 2016-12-01

DCR: Double Component Ranking for Building Reliable Cloud Applications

10.12928/telkomnika.v14i4.3964
Lixing; Harbin Institute of Technology Xue , Zhan; Harbin Institute of Technology Zhang , Decheng; Harbin Institute of Technology Zuo
Since cloud applications are usually large-scale, it is too expensive to enhance the reliability of all components for building highly reliable cloud applications. Therefore, we need to identify significant components which have great impact on the system reliability. FTCloud, an existing approach, ranks the components only considering the impact of component internal failures and ignoring error propagation. However, error propagation is also an important factor on the system reliability. To attack the problem, we propose an improved component ranking framework, named DCR, to identify significant components in cloud applications. DCR employs two individual algorithms to rank the components twice and determines a set of the most significant components based on the two ranking results. In addition, DCR does not require information of component invocation frequencies. Extensive experiments are provided to evaluate DCR and compare it with FTCloud. The experimental results show that DCR outperforms FTCloud in almost all cases.
Volume: 14
Issue: 4
Page: 1565-1574
Publish at: 2016-12-01

Novel Smart Fuzzy Controller Based Separation Efficiency Model for Centrifugation

10.12928/telkomnika.v14i4.4032
M. S.; AlNahrain University Salim , Naseer; Universiti Malaysia Perlis Sabri , Noaman; AMA International University M. Noaman , S.; AlNahrain University Fouad
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexIn biomedical laboratories, to get surely separation efficiency of liquids using currently centrifuge devices, centrifugation process must take not less than 10 minutes at 3000 rpm of sample rotation. An intelligent fuzzy controller for laboratory centrifuge device based on separation efficiency model is produced.  The separation efficiency model is optimizing the time of centrifugation. The new controller programmed with separation efficiency model have many objectives such as high separation efficiency, decrease blood test period, low cost and device power consumption are achieved. In addition, increases the reliability for centrifuge device to estimate the centrifugation period for wide range of predefined separation efficiency, and then, the power consumption of specific separation efficiency for any centrifuge device wattage can be estimate.  The new Fuzzy Logic Controller of centrifuge device has successfully save 18kW.h monthly for 100 daily time device operation.
Volume: 14
Issue: 4
Page: 1417-1423
Publish at: 2016-12-01

Numerical Investigation of A New Junctionless Phototransistor for High-Performance and Ultra-Low Power Infrared Communication Applications

10.12928/telkomnika.v14i4.4788
H.; University of Batna 2 Ferhati , Faycal; University of Batna 2 Djeffal , T.; University of Batna 2 Bentercia
In this paper, a new junctionless optical controlled field effect transistor (JL-OCFET) is proposed to improve the device performance as well as achieving low power consumption. An overall optical and electrical performances comparison of the proposed junctionless design and the conventional inversion mode structure (IM-OCFET) has been developed numerically, to assess the optical modulation behavior of the OCFET for low power optical interconnections applications. It is found that, the proposed design demonstrates excellent capability in decreasing the phototransistor power consumption for inter-chip optical communication application. Moreover, the proposed device offers superior sensitivity and ION/IOFF ratio, in addition to lower signal to noise ratio as compared to the conventional IM-OCFET structure. The obtained results indicate the crucial role of the junctionless (JL) design in enhancing the phototransistor performance and reducing the total power dissipation. Such a very sensitive OCFET can be very promising in the future low power optical receiver less compatible to CMOS modern technology for high-quality inter-chips data communication applications.
Volume: 14
Issue: 4
Page: 1213-1216
Publish at: 2016-12-01

A Soft Error Study on Tri-gate based FinFET and Junctionless-FinFET 6T SRAM Cell – A Comparison

10.12928/telkomnika.v14i4.3458
P; VIT University Chitra , S; VIT UNIVERSITY Ravi , V N; VIT UNIVERSITY Ramakrishnan
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity index When junction based semiconductor devices are scaled down to extreme lower dimensions, the formation of ultra-sharp junctions between source/drain and channel becomes complex since the doping concentration has to vary by several orders of magnitudes over a distance of a few nanometers. In addition, As CMOS device is scaling down significantly, the sensitivity of Integrated Circuits (ICs) to Single Event Upset (SEU) radiation increases. As soft errors emerge as reliability threat there is a significant interest lies both at device and circuit level for SEU hardness in memories. The critical dose observed in FinFET and Junctionless-FinFET (JLT) based 6T-SRAM is given by LET = 1.4 and 0.1 pC/µm. The simulation result analyzes electrical and SEU radiation parameters of FinFET and JLT based 6T-SRAM memory circuit.
Volume: 14
Issue: 4
Page: 1299-1306
Publish at: 2016-12-01

Implementation of Innovative Technologies in the Fields of Electronic Locks

10.12928/telkomnika.v14i4.4184
Štefan; Constantine the Philosopher University in Nitra Koprda , Martin; Constantine the Philosopher University in Nitra Magdin
Almost every institution currently uses attendance system that ensures maintaining control over the attendance of employees, students and other persons. By using attendance system we can provide the right to enter certain rooms for only designated people. On the basis of reports from attendance system we can evaluate a monthly attendance of employees and the by that determine their real movement within the institution. Today is this system the usual standard in every medium and large institution, for example businesses, schools, universities and many others. The price for such a system, however, is often too high. Therefore companies opt also for other alternatives. Our task was to create a working prototype of such a system. Such a system must dispose at least with function for indicating the arrival and departure of employees to be able to determine the time of stay in the workplace. For this purpose we used the platform of microcontroller Arduino with a several basic sensors and software Arduino IDE. In this paper we present the achieved results in terms of applying different access cards.
Volume: 14
Issue: 4
Page: 1329-1337
Publish at: 2016-12-01

Evaluation of Residential Grid-Connected Photovoltaic System as the Potential Energy Source in Malaysia

10.12928/telkomnika.v14i4.3818
S. S.; Universiti Teknologi MARA Abd Wahid , Z.; Universitas Sriwijaya Nawawi , M. I.; Universitas Sriwijaya Jambak , Y. Z.; Universiti Teknologi Malaysia Arief , M. A. B.; Universitas Sriwijaya Sidik , M. W.; Universiti Teknologi Malaysia Mustafa , Z.; Universiti Teknologi Malaysia Adzis
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexApplication of solar energy in Malaysia has been started in 1998. This country has a large potential of solar energy due to its location at equatorial region. The current energy consumption and demand in Malaysia is describes in this paper. The potential of solar energy in Malaysia is described together with the suitable photovoltaic construction. It also explains the plans conducted by Malaysia involving solar energy that covers investments and also projects involved such as Malaysia Building Integrated Photovoltaic (MBIPV). Simulation of grid-connected photovoltaic system in this study is performed using HOMER software. Finally, the potential of having a grid-connected PV system in a residential area is analyzed. The positive and negative findings in terms of cost and suitability of the system are explained.
Volume: 14
Issue: 4
Page: 1235-1241
Publish at: 2016-12-01

Enhanced Antenna Design for Rectenna Application in the 2.45 GHz ISM Band

10.12928/telkomnika.v14i4.4137
Sharif; Universiti Teknikal Malaysia Melaka (UTeM) Ahmed , Zahriladha; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , Mohd Nor; Universiti Teknikal Malaysia Melaka (UTeM) Husain , Azahari; Universiti Teknikal Malaysia Melaka (UTeM) Salleh , Ammar; Universiti Teknikal Malaysia Melaka (UTeM) Alhegazi
In this paper a two layers microstrip antenna design at 2.45 GHz ISM band with Harmonic rejection filter embedded on the ground plane is presented. The two roger substrates with relative permittivity of 2.2 are separated by an air gap which enhances the antenna gain. The design is simulated using Computer Simulation Technology (CST) Studio Suite 2015. Different aperture couplings slots such as rectangular and triangular aperture coupling slots are studied and compared. It is found that the antenna with triangular aperture coupling slot enhances the antenna performance by suppressing 2nd and 3rd harmonics at 5 GHz and 8 GHz, respectively, increasing the antenna gain and providing a better circular polarization behavior. The simulated antenna design achieves a gain of 9 dB, return loss of -23.6dB, axial ratio of 1.27dB and axial-ratio bandwidth of 40.8% (2 ~ 3 GHz). The proposed antenna shows an enhancement in the antenna performance which makes it a suitable candidate for rectifying antenna or rectenna application as it can increase the total conversion efficiency resulting in a high output DC voltage used to power low power electronic and electrical devices such as wireless sensor.
Volume: 14
Issue: 4
Page: 1338-1344
Publish at: 2016-12-01

Combined Beamforming with Orthogonal Space Time Block Code for MIMO-OFDM with Simple Feedback

10.11591/ijeecs.v4.i3.pp580-585
Hala M. Abd Elkader , Gamal M. Abdel-Hamid , Adly Tag El-Dien , Asmaa A. Nassif
In this paper, we introduce a proposed scheme to enhance the performance of orthogonal space time block code (OSTBC) with four time slots and two antennas by combing OSTBC with random beamforming to can use it in the downlink transmission for a mobile system.  Multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system has been recognized as one of the most promising techniques to achieve a good service and increase data rate in the next generation (4&5G) broadband wireless communications. So, we apply Space time block code (STBC) for MIMO-OFDM system with linear decoding.  Also, we perform STBC with beamforming for MIMO-OFDM system to improve the performance of a system. Simulation results show that the beamforming improves bit error rate (BER) performance of OSTBC and STBC-OFDM for different types of modulation and diversity.
Volume: 4
Issue: 3
Page: 580-585
Publish at: 2016-12-01

A Modelling and Simulation of a Sensorless Control of Five-phase PMSM Drives using Multi-dimension Space Vector Modulation

10.12928/telkomnika.v14i4.3996
Kamel; An-Najah National Univeristy Saleh , Mark; Nottingham University Sumner
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexThis paper introduces a new method to track the saturation saliency for position measurement of a five-phase PMSM motor fed by a five-phase inverter through measuring the dynamic current response of the motor line currents due to the IGBT switching actions. The new method uses only the fundamental PWM waveform obtained using the multi-phase space vector pulse width modulation (i.e there is no modification to the operation of the five-phase inverter) similar to the fundamental PWM method proposed for a three-leg inverter. Simulation results are provided to verify the effectiveness of the proposed strategy for saliency tracking of a five-phase PMSM motor driven by five-phase inverter over a wide speed ranges under different load conditions.
Volume: 14
Issue: 4
Page: 1269-1283
Publish at: 2016-12-01

Region Based Image Retrieval Using Ratio of Proportional Overlapping Object

10.12928/telkomnika.v14i4.4289
Agus Zainal; Institut Teknologi Sepuluh Nopember Arifin , Rizka Wakhidatus; Institut Teknologi Sepuluh Nopember Sholikah , Dimas Fanny; Institut Teknologi Sepuluh Nopember H. P. , Dini Adni; Institut Teknologi Sepuluh Nopember Navastara
In Region Based Image Retrieval (RBIR), determination of the relevant block in query region is based on the percentage of image objects that overlap with each sub-blocks. But in some images, the size of relevant objects are small. It may cause the object to be ignored in determining the relevant sub-blocks. Therefore, in this study we proposed a system of RBIR based on the percentage of proportional objects that overlap with sub-blocks. Each sub-blocks is selected as a query region. The color and texture features of the query region will be extracted by using HSV histogram and Local Binary Pattern (LBP), respectively. We also used shape as global feature by applying invariant moment as descriptor. Experimental results show that the proposed method has average precision with 74%.
Volume: 14
Issue: 4
Page: 1608-1616
Publish at: 2016-12-01
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