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30,547 Article Results

Review Paper on Different Dual Band Printed Slot Antenna for 5G Wireless Communication

10.11591/ijict.v7i3.pp105-110
Vibha Raj Nag , Mrinal Sarvagya
With advancement in communication technology over the past decade, there is an increasing demand for miniaturization, cost effective, multiband and wideband antennas. Dual band printed slot antenna designs can support in meeting these requirements. Various techniques, different shapes and geometries have been introduced for size reduction of dual band printed slot antennas. This paper is on various techniques for designing dual band printed slot antenna exhibits details of different geometries developed to get multiband behavior of printed slot antenna. In this paper geometry of the antenna and variousparameters such as return loss plot, gain plot, radiation pattern plot and VSWR plot are discussed. In this paper the review on various techniques of compactness by geometry on different shapes of printed slot antenna for 5G next generation wireless (NGW) mobile application are presented
Volume: 7
Issue: 3
Page: 105-110
Publish at: 2018-12-01

Solar Panel Control System Using an Intelligent Control: T2FSMC and Firefly Algorithm

10.12928/telkomnika.v16i6.8694
Mardlijah; Institut Teknologi Sepuluh Nopember (ITS) Mardlijah , Zainullah; Institut Teknologi Sepuluh Nopember (ITS) Zuhri
Solar panel is a solar energy converter to electrical energy. On solar tracker, there is a controller which sets the movement of solar panel such that it is perpendicular with solar rays. Previous research had designed Type 2 Fuzzy Sliding Mode Control (T2FSMC) controller to control the position of solar panel. However, there was trial and error process to determine gain scale factor so the development of optimization method is needed. This paper aims to modify gain scale factor using Firefly algorithm to increase performance of system. The simulation shows that T2FSMC Firefly has better performance than T2FSMC. T2FSMC Firefly shows the increase of performance on rise time, settling time, and integral time absolute error.
Volume: 16
Issue: 6
Page: 2988-2998
Publish at: 2018-12-01

Comparison of Raindrop Size Distribution Characteristics Across the Southeast Asia Region

10.12928/telkomnika.v16i6.10091
Manhal; Universiti Teknologi Malaysia Alhilali , Lam Hong; Universiti Tun Hussein Onn Malaysia Yin , Jafri; Universiti Teknologi Malaysia Din
Satellite communication requires reliable estimates of the channel characteristics, especially with the future use of higher frequencies. Regardless of the rain rate, the shape of rain drop size distribution (DSD) start to considerably effect the specific attenuation. In this study DSDs are studied using ground-based two-dimensional video disdrometer measurements taken from Johor, Malaysia as well as two similar datasets from Gan and Manus, two equatorial islands. Integral rain parameters are studied to explain DSD variations across the Southeast Asia region. Slightly higher raindrop concentrations and larger diameters were observed in Johor than in Gan or Manus, which is due to Johor being affected by not only oceanic rain- fall but land rainfall as well. The measured rainfall was classified into convective and stratiform precipitation types; the results showed that the Southeast Asia region is dominated by convective rain in terms of accumulated rainfall amount, but stratiform rain occurred more frequently. Further, seasonal variations observed in Johor were insignificant and the DSD variation was mostly due to changes in percentage occurrence of the precipitation types for each monsoon season.
Volume: 16
Issue: 6
Page: 2522-2527
Publish at: 2018-12-01

A SoC-IP Core Test Data Compression Scheme based on Error Correcting Hamming Codes

10.11591/ijeecs.v12.i3.pp933-940
Sanjoy Mitra , Debaprasad Das
As system-on-chip (SoC) integration is growing very rapidly, increased circuit densities in SoC have lead a radical increase in test data volume and reduction of this large test data volume is one of the biggest challenges in the testing industry. This paper presents an efficient test independent compression scheme primarily based on the error correcting Hamming codes. The scheme operates on the pre-computed test data without the need of structural information of the circuit under test and thus it is applicable for IP cores in SoC. Test vectors are equally sliced into the size of ‘n’ bits. Individual slices are treated as a Hamming codeword consisting of ‘p’ parity bits and ‘d’ data bits (n = d + p) and validity of each codeword is verified. If a valid slice is encountered’ data bits prefixed by ‘1’ are written to the compressed file, while for a non-valid slice all ‘n’ bits preceded by ‘0’ are written to the compressed file. Finally, we apply Huffman coding and RLE in order to improve the compression ratio further The efficiency of the proposed hybrid scheme is verified with the experimental outcomes and comparisons to existing compression methods suitable for testing of IP cores.
Volume: 12
Issue: 3
Page: 933-940
Publish at: 2018-12-01

A Critical Review of Time-frequency Distribution Analysis for Detection and Classification of Harmonic Signal in Power Distribution System

10.11591/ijece.v8i6.pp4603-4618
M. H. Jopri , A. R. Abdullah , T. Sutikno , M. Manap , M. R. Ab Ghani , M. R. Yusoff
This paper presents a critical review of time-frequency distributions (TFDs) analysis for detection and classification of harmonic signal. 100 unique harmonic signals comprise of numerous characteristic are detected and classified by using spectrogram, Gabor transform and S-transform. The rulebased classifier and the threshold settings of the analysis are according to the IEEE Standard 1159 2009. The best TFD for harmonic signals detection and classification is selected through performance analysis with regards to the accuracy, computational complexity and memory size that been used during the analysis.
Volume: 8
Issue: 6
Page: 4603-4618
Publish at: 2018-12-01

A Two-stages Microstrip Power Amplifier for WiMAX Applications

10.12928/telkomnika.v16i6.9338
Amine; Settat Hassan 1st University Settat Rachakh , Larbi El; Settat Hassan 1st University Settat Abdellaoui , Jamal; Settat Hassan 1st University Settat Zbitou , Ahmed; Settat Hassan 1st University Settat Errkik , Abdelali; Settat Hassan 1st University Settat Tajmouati , Mohamed; Microwave group ESEO Angers Latrach
Amplification is one of the most basic and prevalent microwave analog circuit functions. Wherefore power amplifiers are the most important parts of electronic circuits. This is why the designing of power amplifiers is crucial in analog circuit designing. The intent of this work is to present an analysis and design of a microwave broadband power amplifier by using two stages topology. A two stages power amplifier using a distributed matching network for WiMAX applications is based on ATF-21170 (GaAs FET). The configuration aims to achieve high power gain amplifier with low return loss over a broad bandwidth. The proposed BPA is designed with a planar structure on an epoxy (FR4) substrate. The planar structure is also utilized for getting the good matching condition. The advanced design system (ADS) software is used for design, simulation, and optimization the proposed amplifier. The complete amplifier achieves an excellent power gain; is changed between 28.5 and 20dB with an output power of 12.45dBm at 1dB compression point. For the input reflection coefficient (S11) is varied between -20 and -42dB. While the output reflection coefficient (S22) is varied between -10 and - 49dB over the wide frequency band of 3.2-3.8GHz.
Volume: 16
Issue: 6
Page: 2500-2506
Publish at: 2018-12-01

Image Analysis using Color Co-occurrence Matrix Textural Features for Predicting Nitrogen Content in Spinach

10.12928/telkomnika.v16i6.10326
Yusuf; Universitas Brawijaya Hendrawan , Indah Mustika; Universitas Brawijaya Sakti , Yusuf; Universitas Brawijaya Wibisono , Muchnuria; Universitas Brawijaya Rachmawati , Sandra Malin; Universitas Brawijaya Sutan
This study aimed to determine the nitrogen content of spinach leaves by using computer imaging technology. The application of Color Co-occurrence Matrix (CCM) texture analysis was used to recognize the pattern of nitrogen content in spinach leaves. The texture analysis consisted of 40 CCM textural features constructed from RGB and grey colors. From the 40 textural features, the best features-subset was selected by using features selection method. Features selection method can increase the accuracy of image analysis using ANN model to predict nitrogen content of spinach leaves. The combination of ANN with Ant Colony Optimization resulted in the most optimal modelling with mean square error validation value of 0.0000083 and the R2 testing-set data = 0.99 by using 10 CCM textural features as the input of ANN. The computer vision method using ANN model which has been developed can be used as non-invasive sensing device to predict nitrogen content of spinach and for guiding farmers in the accurate application of their nitrogen fertilization strategies using low cost computer imaging technology.
Volume: 16
Issue: 6
Page: 2712-2724
Publish at: 2018-12-01

Revealing AES Encryption Device Key on 328P Microcontrollers with Differential Power Analysis

10.11591/ijece.v8i6.pp5144-5152
Septafiansyah Dwi Putra , Adang Suwandi Ahmad , Sarwono Sutikno , Yusuf Kurniawan , Arwin Datumaya Wahyudi Sumari
This research demonstrates the revealing of an advanced encryption standard (AES) encryption device key. The encryption device is applied to an ATMEGA328P microcontroller. The said microcontroller is a device commonly used in internet of things (IoT). We measured power consumption when the encryption process is taking place. The message sent to the encryption device is randomly generated, but the key used has a fixed value. The novelty of this research is the creation of a systematic and optimal circuit in carrying the differential power analysis or difference of means (DPA/DoM) technique, so the technique can be applied in key revealing on a microcontroller device by using 500 traces in 120 seconds.
Volume: 8
Issue: 6
Page: 5144-5152
Publish at: 2018-12-01

Preserving Authenticity and Integrity of Distributed Networks through Novel Message Authentication Code

10.11591/ijeecs.v12.i3.pp1297-1304
Gurpreet K. Sodhi , Gurjot S. Gaba , Lavish Kansal , Eduard Babulak , Mohammed AlZain , Sandeep Kumar Arora , Mehedi Masud
In this era of universal electronic connectivity, communication is no more confined to transfer of data from one end to the other; rather it aims at secure data transfer. Communication sector has developed beyond this traditional boundary of data transfer and is now working on ways to provide data from the intended senders to the intended receivers in an unaltered form. Considering all these conditions, the data transfer needs to follow the principles of authentication, confidentiality and integrity. The former two have been addressed using digital signatures and encryption schemes respectively, while the solution to the later is the use of Message Authentication Code. This paper presents a Message Authentication Code scheme, which uses the biological characteristics represented by Deoxyribonucleic acid combined with the output of Blum Blum Shub Random Number Generator, as a secret key along with a novel hash algorithm. This Message Authentication Code structure is evaluated on the basis of National Institute of Science and Technology test suite for random numbers, avalanche criteria and network attacks. The results reveal that the proposed scheme performs well under all the criteria and thus is capable of preserving integrity; this increases its applicability in any data sensitive environment.
Volume: 12
Issue: 3
Page: 1297-1304
Publish at: 2018-12-01

Sensorless Control of a Fault-Tolerant Multi-Level PMSM Drive

10.12928/telkomnika.v16i6.9647
Kamel; An-Najah National Univeristy Saleh , Mark; Nottingham University Sumner
This paper presents a new technique to track the saliency position in a permanent magnet synchronous motor (PMSM) post a single phase open-circuit fault. The PMSM is driven by a fault-tolerant multi-level inverter that is utilized to implement a fault-tolerant control strategy to minimize system performance degradation post the fault.The fault-tolerant multi-level inverter is consisting of a number of insulated-gate bipolar transistors (IGBTs). The dynamic current reponses of the PMSM motor due to the switching actions of these IGBTs are used extract the saliency position. This process is not introducing any modification to the operation of the fault-tolerant multil-level inverter as it uses only the fundamental pulse width modulation (PWM) waveform. Moreover,it considers the modifications introduced to the PMSM motor and the multi-level inverter post the fault.Simulation results are provided to verify the effectiveness of the proposed strategy of saliency tracking of a PMSM motor driven by a fault-tolerant four-leg multi-level inverter over a wide range of speeds in the case of a single-phase open circuit fault.
Volume: 16
Issue: 6
Page: 2930-2942
Publish at: 2018-12-01

Proposed P-shaped Microstrip Antenna Array for Wireless Communication Applications

10.12928/telkomnika.v16i6.10494
Raad H.; Al-Mustansirayh university Thaher , Noor Baqir; Al-Mustansirayh University Hassan
In this paper a P-shaped microstrip antenna array is proposed for X-band applications in the frequency range (8.1567-9.3811) GHz .The gain obtained in this frequency range is about 8.305 dBi. The reflection coefficient is less than - 10 dB in the above frequency range. The simulation results were obtained for the optimum parameters using the CST software while the practical test was carried out using Vector Network Analyzer (VNA). The microstrip antenna was manufactured using FR-4 substrate with relative dielectric constant of 4.3 and loss tangent tan⁡〖δ=0.002〗.The simulation and practical results were compared. The size of the antenna array is (33×70×1.6) 〖mm〗^3. This array is suitable for satellite communication, radar application.
Volume: 16
Issue: 6
Page: 2597-2607
Publish at: 2018-12-01

High Gain Power Generation Based On Hybrid Renewable Energy for AC Load Application

10.11591/ijeecs.v12.i3.pp1195-1202
Shaik Mohammad Irshad , G.P Ramesh
This study presents the distributed energy source based current fed inverter has generated high voltage with less passive elements. The hybrid renewable energy generation such as solar and wind has used. The single stage power generation based switched inverter has combined characteristics of both impedance source inverter and switched boost inverter. In conventional voltage source inverter has less boost ability and high electromagnetic noise immunity to the modified current fed inverter circuit. The single diode photovoltaic model and wind-based energy generation have fed into current fed switched inverter for improving high gain and high power factor. The maximum power point tracking such as incremental conductance algorithm has fast-tracking of solar power and generates continuous power to the inverter circuit. 12V solar power and wind power is designed for dc power production, and the output of dc link capacitor is 118V using current fed switched inverter. The current fed switched inverter is designed and implemented in MATLAB/Simulink environment.
Volume: 12
Issue: 3
Page: 1195-1202
Publish at: 2018-12-01

Transient Stability Improvement of the Power Systems

10.11591/ijeecs.v12.i3.pp916-923
Zaid H. Al-Tameemi , Hayder H. Enawi , Karrar M. Al-Anbary , Hussam M. Almukhtar
During the last few decades, electrical power demand enlarged significantly whereas power production and transmission expansions has been brutally restricted as a result of restricted resources as well as ecological constrains. Consequently, many transmission lines have been profoundly loading so the stability of power system became as Limiting factor for transferring electrical power. So, maintaining a secure and stable operation of the electric power networks is deemed an imporatant and challenge issue.transient stability of a power system has been gained a considerable attention from researchers dute to it importance . Therefore,this paper sheds light on A substantial number of the adopted techniques, including an inclease in  inertia constant of generator, shunt capacitor, reduction reactance of the transmission line to acheive this purpose. A 7-Machine CIGRE system has been considered a case study. Matlab package has been employed to implement this study. The simulation results show that the transient stability of the repective system enhanced considerably with these techniques.
Volume: 12
Issue: 3
Page: 916-923
Publish at: 2018-12-01

A Review of Energy-aware Cloud Computing Surveys

10.12928/telkomnika.v16i6.9938
Azlan; Universiti Teknologi MARA Ismail , Nor Adzlan; Universiti Teknologi MARA Jamaludin , Suzana; Universiti Teknologi MARA Zambri
The increasing demands on the usage of data centers especially in provisioning cloud applications (i.e. data-intensive applications) have drastically increased the energy consumption and becoming a critical issue. Failing to handle the increasing in energy consumption leads to the negative impact on the environment, and also negatively affecting the cloud providers’ profits due to increasing costs. Various surveys have been carried out to address and classify energy-aware approaches and solutions. As an active research area with increasing number of proposals, more surveys are needed to support researchers in the research area. Thus, in this paper, we intend to provide the current state of existing related surveys that serve as a guideline for the researchers as well as the potential reviewers to embark into a new concern and dimension to compliment existing related surveys. Our review highlights four main topics and concludes to some recommendations for the future survey.
Volume: 16
Issue: 6
Page: 2740-2746
Publish at: 2018-12-01

Application of EMG and Force Signals of Elbow Joint on Robot-assisted Arm Training

10.12928/telkomnika.v16i6.11707
Riky Tri; Universitas Airlangga Yunardi , Eva Inaiyah; Universitas Airlangga Agustin , Risalatul; Universitas Airlangga Latifah , Winarno; Universitas Airlangga Winarno
Flexion-extension based on the system's robotic arm has the potential to increase the patient's elbow joint movement. The force sensor and electromyography signals can support the biomechanical system to detect electrical signals generated by the muscles of the biological. The purpose of this study is to implement the design of force sensor and EMG signals application on the elbow flexion motion of the upper arm. In this experiments, the movements of flexion at an angle of 45º, 90º and 135º is applied to identify the relationship between the amplitude of the EMG and force signals on every angle. The contribution of this research is for supporting the development of the Robot-Assisted Arm Training. The correlation between the force signal and the EMG signal from the subject studied in the elbow joint motion tests. The application of sensors tested by an experimental on healthy subjects to simulating arm movement. The experimental results show the relationship between the amplitude of the EMG and force signals on flexion angle of the joint mechanism for monitoring the angular displacement of the robotic arm. Further developments in the design of force sensor and EMG signals are potentially for open the way for the next researches based on the physiological condition of each patient.
Volume: 16
Issue: 6
Page: 2913-2920
Publish at: 2018-12-01
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