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29,167 Article Results

Comparative Study of Indoor Navigation Systems for Autonomous Flight

10.12928/telkomnika.v16i1.6814
Muhammad; University of Tabuk Ayaz
Recently, Unmanned Aerial Vehicles (UAVs) have attracted the society and researchers due to the capability to perform in economic, scientific and emergency scenarios, and are being employed in large number of applications especially during the hostile environments. They can operate autonomously for both indoor and outdoor applications mainly including search and rescue, manufacturing, forest fire tracking, remote sensing etc. For both environments, precise localization plays a critical role in order to achieve high performance flight and interacting with the surrounding objects. However, for indoor areas with degraded or denied Global Navigation Satellite System (GNSS) situation, it becomes challenging to control UAV autonomously especially where obstacles are unidentified. A large number of techniques by using various technologies are proposed to get rid of these limits. This paper provides a comparison of such existing solutions and technologies available for this purpose with their strengths and limitations. Further, a summary of current research status with unresolved issues and opportunities is provided that would provide research directions to the researchers of the similar interests.
Volume: 16
Issue: 1
Page: 118-128
Publish at: 2018-02-01

A Novel Design of a Miniature Metamaterial Antenna for RFID Reader Applications

10.12928/telkomnika.v16i1.8060
A.; Hassan 1st University Ennajih , J.; Hassan 1st University Zbitou , M.; Microwave Group (ESEO) Latrach , A.; Hassan 1st University Errkik , L.; Hassan 1st University EL Abdellaoui , A.; Hassan 1st University Tajmouati
In this article, we propose a novel design of a dual band antenna based metamaterial for RFID applications. The proposed antenna consists of a rectangular patch using inverted u-slot in radiating element and two split ring resonators loaded in the ground plane. The antenna is printed on an FR4 substrate having athickness of 1.6 mm, permitivitty of 4.4 and loss tanget of 0.025. this antenna is feed by a micostrip line having caracteristique of 50 Ohms. The designed antenna resonates at the UHF band around 900Mz with an input impedance of 87MHz and also, resonates at the ISM band around 2.45GHz with a large bandwidth about 516MHz. The designed antenna is simulated bys using CST and the results is validated by HFSS. After simulation, a prototype of the proposed antenna is fabricated, and the measured results show a good agreement with the simulated one.
Volume: 16
Issue: 1
Page: 174-181
Publish at: 2018-02-01

High-precision Ultrasonic Flowmeter for Mining Applications based on Velocity-area

10.12928/telkomnika.v16i1.5185
Lili; Shandong University of Science and Technology Zhang , Lenian; Shandong University of Science and Technology Xu , Laxmisha; Shandong University of Science and Technology Rai
The flowmeter is widely used in coal mining because of its higher measurement precision and simple installation without channel project modification. In this paper, a flow measurement method based on velocity-area is investigated, and a functional flowmeter for mining applications with higher precision is designed. The two key parameters, the liquid level and flow velocity are required to be obtained for achieving the proposed method. The proposed flowmeter is composed of three main functional modules: (1) flow velocity detection module based on ultrasonic time difference method, (2) liquid level detection module, and (3) mud level detection module based on ultrasonic pulse echo method. All the measured data are transferred to the monitoring station for analysis and displayed in real-time through M-BUS. The flowmeter is designed focusing on mining applications, and has higher benefits for preventing water disasters in coal mines
Volume: 16
Issue: 1
Page: 84-93
Publish at: 2018-02-01

Hybrid Micro Genetic Algorithm Assisted Optimum Detector for Multi-Carrier Systems

10.11591/ijeecs.v9.i2.pp512-525
Mahmoud Albreem , SPK Babu , M F M Salleh
A low-complexity detection scheme, which consists of a Hybrid Micro Genetic Algorithm (Hybrid- µGA), is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems. In the absence of orthogonality, intercarrier-interference (ICI) occurs because a signal from one subcarrier causes interference to others. In several environment, the OFDM signal reflections from a far obstacle generate inter-block-interference (IBI) due to long time delays. To avoid these unpleasant effects of IBI and ICI in OFDM system, a Hybrid-µGA detection algorithm is proposed. The proposed detector combines the conventional one-Tap equalizer and the Micro Genetic Algorithm (µGA) search engine. The output of one-Tap equalizer is considered as the input to µGA search engine. Therefore, the µGA starts with some knowledge rather than blindly to speed up the search. Theoretical analysis and simulation results show that the proposed detection Hybrid- µGA scheme substantially improves the performance of OFDM systems. Moreover, its complexity is 10 times lower than the conventional GA.
Volume: 9
Issue: 2
Page: 512-525
Publish at: 2018-02-01

Performance Evaluation of Smart Home System using Internet of Things

10.11591/ijece.v8i1.pp400-411
Teddy Surya Gunawan , Intan Rahmithul Husna Yaldi , Mira Kartiwi , Hasmah Mansor
Nowadays, many researches have been conducted on smart home. Smart home control system (SHCS) can be integrated into an existing home appliances to reduce the need for human intervention, increase security and energy efficiency. We have proposed a smart home system using internet of things and four types of sensors, including PIR, temperature, ultrasonic, and smoke gas sensor for automatic environmental control and intrustion detection. In this paper, the performance of the previously developed prototype of smart home system will be evaluated. First, experiments on various sensors will be conducted. Next, the communicaton channel using wireless and Ethernet modules will be discussed. Moreover, the overall SHCS will be evaluated in terms of hardware and software performance. Additionaly, solar charger enhances the availability of our prototype system. Results showed the effectiveness of our proposed smart home system in the prototype and real life experiments.
Volume: 8
Issue: 1
Page: 400-411
Publish at: 2018-02-01

Investigation of Knee Flexion Angle Influences on Intra-Body Communication’s (IBC) Signal Attenuation

10.11591/ijeecs.v9.i2.pp424-430
I W Ibrahim , M M M Aruwa , A.H.A. Razak , A. Ahmad , R. N. Khir
Galvanic coupling method is one of the methods introduced in intra-body communication (IBC). IBC uses human body to as the communication medium for data transmission. In this paper, the investigation focuses on signal attenuation performance across knee joint using the galvanic coupling analysis. The signal attenuation was determined by implementing the galvanic coupling analysis at specific knee flexion angle. The galvanic analysis initiated by deciding the operating frequency in between 40 to 60 MHz in order to analyze the signal attenuation between the knee flexion angles. This paper found that the lowest signal attenuation at the operating frequency was 47.25dB, while the highest one was 52.63dB where the knee flexion angle is 0o and 155o respectively. It was concluded that the signal attenuation decrease with the increasing of knee joint existence at the specific flexion angle. However, a wider experiment must be conducted for various data that will correspond to signal attenuation for various influenced human data characteristics.
Volume: 9
Issue: 2
Page: 424-430
Publish at: 2018-02-01

File Encryption and Hiding Application Based on AES and Append Insertion Steganography

10.12928/telkomnika.v16i1.6409
G. C.; Gunadarma University Prasetyadi , R.; Gunadarma University Refianti , A. B.; Gunadarma University Mutiara
Steganography is a method of hiding secret message in other innocuous looking object so that its presence is not revealed. In this paper, a message, which is a computer file of any type and size, is hidden in a selected cover or carrier, which is a computer file of certain types. The steganography method used in this paper is called append insertion steganography method. This method is chosen as an attempt to remove the limitation of message format, which appears in many popular steganography methods. To scramble the meaning of the hidden message, AES-256 (Rijndael algorithm) is used to encrypt the message with a secret passphrase. A special block of bytes is used to identify and verify the original message so it can be recovered while retaining its integrity. The C# programming language and .NET Framework are chosen to implement the algorithm into a Windows application. In this paper, one cover file contains exactly one message file. In the testing, five random files are used as secret message. Their integrity is calculated using SHA-256 before hiding and after recovery. In the testing, they all retain their integrity, proven by exact hash values. Thus, the application as the implementation of proposed algorithm is proven feasible but only for personal use as some improvements still have to be implemented.
Volume: 16
Issue: 1
Page: 361-367
Publish at: 2018-02-01

Long-term Robust Tracking whith on Failure Recovery

10.12928/telkomnika.v16i1.7271
Khaled; University of Monastir Hammemi , Mohamed; University of Monastir Atri
This article aims at a new algorithm for tracking moving objects in the long term. We have tried to overcome some potential difficulties, first by a comparative study of the measuring methods of the difference and the similarity between the template and the source image. In the second part, an improvement of the best method allows us to follow the target in a robust way. This method also allows us to effectively overcome the problems of geometric deformation, partial occlusion and recovery after the target leaves the field of vision. The originality of our algorithm is based on a new model, which does not depend on a probabilistic process and does not require a data based detection in advance. Experimental results on several difficult video sequences have proven performance advantages over many recent trackers. The developed algorithm can be employed in several applications such as video surveillance, active vision or industrial visual servoing.
Volume: 16
Issue: 1
Page: 302-313
Publish at: 2018-02-01

A Survey: Space Vector PWM (SVPWM) in 3φ Voltage Source Inverter (VSI)

10.11591/ijece.v8i1.pp11-18
Shalini Vashishtha , K.R. Rekha
Since last decades, the pulse width modulation (PWM) techniques have been an intensive research subject. Also, different kinds of methodologies have been presented on inverter switching losses, inverter output current/ voltage total harmonic distortion (THD), inverter maximum output of DC bus voltage. The Sinusoidal PWM is generally used to control the inverter output voltage and it helps to maintains drive performance. The recent years have seen digital modulation mechanisms based on theory of space vector i.e. Space vector PWM (SVPWM). The SVPWM mechanism offers the enhanced amplitude modulation indexes (MI) than sinusoidal PWM along with the reduction in the harmonics of inverter output voltage and reduced communication losses. Currently, the digital control mechanisms have got more attention than the analog counterparts, as the performance and reliability of microprocessors has increased. Most of the SVPWM mechanisms are performed by using the analog or digital circuits like microcontrollers and DSPs. From the recent study, analysis gives that use of Field Programmable Gate Arrays (FPGA) can offer more efficient and faster solutions. This paper discusses the numerous existing research aspects of FPGA realization for voltage source inverter (VSI) along with the future line of research.
Volume: 8
Issue: 1
Page: 11-18
Publish at: 2018-02-01

Design of Cloud-based and IPTV Digital Signage System

10.12928/telkomnika.v16i1.6655
Algifanri; Universitas Putera Batam Maulana , Asfiyan; Universitas Bina Nusantara Asfiyan
The purpose of this research is to control, monitoring, and broadcast video, audio, text with digital signage system based on cloud and IPTV. It also provides multi content on one screen display included YouTube channel and RSS feed. Network connection transfer using internet protocol, the component of cloud-based and IPTV included with a content management system and a broadcast management system. Companies provide digital signage services are still using one of the ads in large size, this can alleviate the cost of advertising using digital signage. Therefore, the result is a designed from a display of how the content can be variatif when displayed on a digital signage as well through cloud-based and IPTV.
Volume: 16
Issue: 1
Page: 385-389
Publish at: 2018-02-01

A New Compact CPW-Fed Dual-Band Uniplanar Antenna for RFID Applications

10.12928/telkomnika.v16i1.7560
Ahmed El; Hassan 1st University Hamraoui , El Hassane; Hassan 1st University Abdelmounim , Jamal; Hassan 1st University Zbitou , Laarbi; Hassan 1st University Elabdellaoui , Hamid; Moulay Ismail University Bennis , Mohamed; Microwave Group Latrach
In this paper a new dual-band uniplanar monopole antenna fed by Coplanar Waveguide (CPW) line is proposed for Radio Frequency Identification (RFID) applications. The antenna structure includes a CPW fed line and the dual-band operation is achieved from the G-shaped folded antenna. The antenna parameters have been investigated and optimized by using CST Microwave Studio. To validate the CST Microwave Studio results before the antenna achievement, we have conducted another study by using ADS. The final circuit was achieved, measured and validated. Experimental results show that the proposed antenna with compact size of 30*45 mm2 is simple in design and compact in size. It exhibits broadband impedance matching, consistent omnidirectional radiation patterns and appropriate gain characteristics suitable for the microwave RFID applicartions.
Volume: 16
Issue: 1
Page: 102-109
Publish at: 2018-02-01

A Solution to Partial Observability in Extended Kalman Filter Mobile Robot Navigation

10.12928/telkomnika.v16i1.9025
Hamzah; Universiti Malaysia Pahang Ahmad , Nur Aqilah; Universiti Malaysia Pahang Othman , Mohd Syakirin; Universiti Malaysia Pahang Ramli
Partial observability in EKF based mobile robot navigation is investigated in this paper to find a solution that can prevent erroneous estimation. By only considering certain landmarks in an environment, the computational cost in mobile robot can be reduced but with an increase of uncertainties to the system. This is known as suboptimal condition of the system. Fuzzy Logic technique is proposed to ensure that the estimation achieved desired performance even though some of the landmarks were excluded for references. The Fuzzy Logic is applied to the measurement innovation of Kalman Filter to correct the positions of both mobile robot and any observed landmarks during observations. The simulation results shown that the proposed method is capable to secure reliable estimation results even a number of landmarks being excluded from Kalman Filter update process in both Gaussian and non-Gaussian noise conditions.
Volume: 16
Issue: 1
Page: 134-141
Publish at: 2018-02-01

A Real Time Condition Monitoring System for Gears Operating under Variable Load Conditions

10.11591/ijeecs.v9.i2.pp493-501
Abdullah Alwadie
Gears are important component of the rotational power transmission system and are largely used in variable load and speed applications. The faults on the gear generate excessive vibration which leads to breakdown of the machine. Sensor based methods could diagnose gear faults but proved to be expensive and have limited applications due to heavy cost and need of access of gear box for sensor installation.  The motor stator current analysis has been reported to overcome the drawbacks of the sensor based fault detection methods. However, motor stator current analysis has a limited capability for reliable detection of small gear fault signatures typically for low load conditions. This paper presents an alternative non-invasive approach based on instantaneous power analysis of the motor to reliably diagnose gear faults for variable load applications. The theoretical and experimental results indicates that the instantaneous power analysis offers three fault related harmonics and amplitude variations on these harmonics could give the indication of health status of the gear.  The superiority of the proposed instantaneous power analysis technique has been confirmed through experiments performed on three operating points of the motor. The comparison of the amplitude sensitivity of the motor stator current and instantaneous power at three operating points has been performed to validate the superiority of the proposed technique.
Volume: 9
Issue: 2
Page: 493-501
Publish at: 2018-02-01

Designing an Agent for Information Extraction from Persian E-shops

10.12928/telkomnika.v16i1.5943
Nasrin; Islamic Azad University Rasouli , Leila; Islamic Azad University Abedi , Sara; Islamic Azad University Ghaei
E-shops are among the most conventional applications of Electronic Commerce. In these shops, the buyers search for their goods through key words or classifications and read the product description provided by the sellers. Though, when the number of items is high, this gets to be difficult for the users. On the one hand, there are too many e-shops, and browsing in these shops to find the best and most appropriate goods is a difficult and time-consuming process. On the other hand, product descriptions are not the same in different websites, and there are different product forms. This study investigates about products and sellers in various websites based on the conditions and user requirements through software agents which present the extracted information in the form of a table to the users which enables them to compare prices and each seller’s conditions without spending too much time for browsing. Using this method increases precision and recall indices comparing to a conventional user browsing.
Volume: 16
Issue: 1
Page: 455-462
Publish at: 2018-02-01

Efficiency of 128-bit Encryption and Decryption Process in Elgamal Method Using Elliptic Curve Cryptography (ECC)

10.12928/telkomnika.v16i1.6953
Dicky; STMIK Triguna Dharma Nofriansyah , Afzalur; STMIK Triguna Dharma Syaref , Widiarti; STMIK Triguna Dharma R Maya , Ganefri; Universitas Negeri Padang Ganefri , Ridwan; Universitas Negeri Padang Ridwan
Cryptography is a growing science of data security. The integrity of a data is an important thing to keep the secrets contained in the data. In this research will be visualized the efficient quantities that use elliptic curves and do not use them. The Elgamal method is an asymmetric cryptographic algorithm whose complexity of processes. It is especially for digital signatures. This research will discuss about the use of ECC to optimize and streamline the Encryption and Decryption process in particular 128-bit Elgamal method. The hope is that by using elliptic curves the timing of the encryption and decryption process can run faster in the computation of Elgamal Method.
Volume: 16
Issue: 1
Page: 352-360
Publish at: 2018-02-01
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