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28,451 Article Results

Implementation of PI Controller for 4ф Srm Drive Using TMS320F28335

10.11591/ijpeds.v5.i3.pp283-292
Mekala N , Muniraj C
This paper presents the experimental investigation of DSP based 4Ф Switched Reluctance Motor (SRM) Drive. SRM is a doubly-salient, singly-excited machine and having very simple construction, has a low inertia and allows an extremely high-speed operation. The control system of SRM is highly complex due to non linear nature. In such a system for implementing control algorithm needs high speed processor. In this work TMS320F28335 DSP processor is used to implement the inner loop PI current controller and outer loop PI speed controller. The TMS320F28335 is highly integrated, high performance solution for challenging control applications. The various experimental tests are carried out in 1 HP 4Ф SRM. The experimental results are reported in order to verify the steady state, transient and robustness performance of the controller.
Volume: 5
Issue: 3
Page: 283-292
Publish at: 2015-02-01

A New Approach to Linear Estimation Problem in Multi-user Massive MIMO Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4212
Muhammad Ali Raza Anjum
A novel approach for solving linear estimation problem in multi-user massive MIMO systems is proposed. In this approach, the difficulty of matrix inversion is attributed to the incomplete definition of the dot product. The general definition of dot product implies that the columns of channel matrix are always orthogonal whereas, in practice, they may be not. If the latter information can be incorporated into dot product, then the unknowns can be directly computed from projections without inverting the channel matrix. By doing so, the proposed method is able to achieve an exact solution with a 25% reduction in computational complexity as compared to the QR method. Proposed method is stable, offers an extra flexibility of computing any single unknown, and can be implemented in just twelve lines of code. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i2.7003 
Volume: 13
Issue: 2
Page: 337-351
Publish at: 2015-02-01

Dynamic Response of Two-Electrode Distributed Feedback Laser for Stable Signal Mode Operation

10.11591/ijece.v5i1.pp23-30
Hamza Bousseta , A. Zatni , A. Amghar , A. Moumen , A. Elyamani
The longitudinal spatial hole burning (LSHB) effect has been known to limit the performance of distributed feedback (DFB) semiconductor lasers to achieve a better dynamic signal mode operation (DSMO). So, in order to ensure a stable (DSMO), we propose a novel device design of two electrode DFB lasers with longitudinal variation in the coupling coefficient (distributed coupling coefficient (DCC)), the structure also contains a phase shifted in middle of the cavity. By means of the finite difference time domain (FDTD) numerical method, we analyze dynamic response of our structure and we also compare the results with the conventional two electrode DFB laser (TE-DFB). The numerical simulation shows that, a better dynamic signal mode has been achieved by TE-DCC-DFB lasers in comparison with TE-DFB laser due to its better and high side mode suppression ratio (SMSR). Therefore, the TE-DCC-DFB lasers will be useful to extend the transmission distance in optical fiber communication systems.
Volume: 5
Issue: 1
Page: 23-30
Publish at: 2015-02-01

Software Development of Automatic Data Collector for Bus Route Planning System

10.11591/ijece.v5i1.pp150-157
Adam Hendra Brata , Deron Liang , Sholeh Hadi Pramono
Public transportation is important issue in Taiwan. Recently, mobile application named Bus Route Planning was developed to help the user to get information about public transportation using bus. But, this application often gave the user inaccurate bus information and this application has less attractive GUI. To overcome those 2 problems, it needed 2 kinds of solutions. First, a more accurate time prediction algorithm is needed to predict the arrival time of bus. Second, augmented reality technology can be used to make a GUI improvement. In this research, Automatic Data Collector system was proposed to give support for those 2 solutions at once. This proposed system has 3 main functionalities. First, data collector function to provide some data sets that can be further analyzed as an base of time prediction algorithm. Second, data updater functions to provide the most updated bus information for used in augmented reality system. Third, data management function to gave the system better functionality to supported those 2 related systems. This proposed Automatic Data Collector system was developed using batch data processing scenario and SQL native query in Java programming language. The result of testing shown this data processing scenario was very effective to made database manipulation especially for large-sized data.
Volume: 5
Issue: 1
Page: 150-157
Publish at: 2015-02-01

Detection of Atrial Fibrillation using Autoregressive modeling

10.11591/ijece.v5i1.pp64-70
Kora Padmavathi , K.Sri Ramakrishna
A‎atrial fibrillation (AF) is the arrhythmia that commonly causes death in the adults. We measured AR coefficients using Burg’s method for each 15 second segment of ECG. These features are classified using the different statistical classifiers: kernel SVM and KNN classifier. The performance of the algorithm was evaluated on signals from MIT Physionet database.. The effect of AR model order and data length was tested on the classification results. This method shows better results can be used for practical use in the clinics.‏
Volume: 5
Issue: 1
Page: 64-70
Publish at: 2015-02-01

Impact Analysis of midpoint Connected STATCOM on Distance Relay Performance

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4201
Ilango R , Sree Renga Raja T
This paper presents the impact of the Static Synchronous Compensator (STATCOM) on the performance of distance protection of EHV transmission lines. A 400kV transmission system having midpoint connected STATCOM with its control circuit is modeled using MATLAB/SIMULINK software. The impact of STATCOM on distance relay for different fault conditions and different fault locations is analyzed. Simulation results indicate that the presence of the STATCOM in the transmission system significantly changes the line impedance seen by the distance relay to be lower or higher than the actual line impedance. Due to this the performance of the distance relay changes, either overreaches or under reaches. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.6987 
Volume: 13
Issue: 2
Page: 257-263
Publish at: 2015-02-01

Robust Synchronization of the Unified Chaotic System

10.11591/ijece.v5i1.pp102-110
Hatem Trabelsi , Mohamed Benrejeb
The paper investigates the synchronization problem of the unified chaotic system. The case of identical, but unknown master and slave unified chaotic systems is considered. Based on compound matrices formalism, a unified synchronization control scheme is proposed independently of the unknown system parameter. Simulation results are provided to show the effectiveness of the presented scheme.
Volume: 5
Issue: 1
Page: 102-110
Publish at: 2015-02-01

A Compact Multiple Band-Notched Planer Antenna with Enhanced Bandwidth Using Parasitic Strip Lumped Capacitors and DGS-Technique

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4194
Ahmed Boutejdar , Ahmed A Ibrahim , Edmund P Burte
UWB antenna with dual notched characteristics fed by microstrip transmission line is presented in this paper. The tapered connection between the rectangular patch and the feed line is used to produce a good impedance matching from 2.3 to 11.5 GHz. A dual band frequency notches are achieved using U-DGS loaded with lumped capacitors. The first notch frequency band is achieved using DGS to reduce the interference with WIMAX from 3.3 to 3.7 Ghz. The second notch frequency band is also achieved using U-parasitic strip placed in the ground plan to eliminate the interference with WLAN from 5.2 to 5.9 GHz. Lumped capacitors are combined with the slot due to miniaturize the slot size. The size of the resonator is reduced by more than 40% when lumped capacitors are used. The proposed antenna hasVSWR < 2 except the notched bands. The simulated results confirm that the antenna is suitable for UWB applications. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.6976
Volume: 13
Issue: 2
Page: 203-208
Publish at: 2015-02-01

ARM 9 Based Intelligent System for Biometric Figure Authentication

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4195
V. Krishna Chaitanya Reddy , B. Sukumar , S. Javeed Hussain
Now a day’s some universities in India are enforcing afiliated colleges to implement biometric fingerprint attendance system to monitor student attendance. This sytem requiresbiometric fingerprint scanner need to be installed in affiliated   college where student studying and it is monitored by the university online. As finger print scanner is placed at affiliated college which is far away from the university, there is possibility of adding fake finger print into the scanner which can be used for proxy attendance of student who is not attending the college. In this paper, the proposed system is designed in such a way that, the acquired fingerprint of the student is initially stored in the database with complete student profile and photograph. And, when the student places his fingerprint it compares with stored database. If fingerprint matches it displays the student photo. The proposed intelligent system includes R305 fingerprint sensor and ARM 9 processor. We used RS232 for interfacing with system and visual studio 2008 software for designing the interface. This attendance system is verified practically with students and we obtained the desired results accurately. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7042 
Volume: 13
Issue: 2
Page: 209-214
Publish at: 2015-02-01

Optimal Warranty Policy Considering Two-dimensional Imperfect Preventive Maintenance for Repairable Product

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4196
Xin Yue Li , Yun Xian Jia
For some kinds of products, such as car, aircraft, government acquisition, the consumers have strict requirements to the reliability of these products. Then the manufacturer is inclined to provide the two-dimensional preventive maintenance policy to take the usage degree of the product into account. As a result, two-dimensional preventive maintenance policy in the warranty period has recently obtained increasing attention from manufacturers and consumers. In this paper, we focused on the optimization of based warranty cost and proposed a new expected cost model of the two-dimensional imperfect preventive maintenance policy from the perspective of the manufacture. The optimal two-dimensional preventive maintenance was obtained by minimizing based warranty cost. And asymmetric copula function was applied to modeling the failure function of the product. At last, numerical examples are given to illustrate the proposed models, of which the results prove the model effective and validate. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7043 
Volume: 13
Issue: 2
Page: 215-222
Publish at: 2015-02-01

Dynamic RWX ACM Model Optimizing The Risk on Real Time Unix File System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4217
PK Patra , Padma Lochan Pradhan
The preventive control is one of the well advance controls for recent security for protection of data and services from the uncertainty. Because, increasing the importance of business, communication technologies and growing the external risk is a very common phenomenon now-a-days. The system security risks put forward to the management focus on IT infrastructure (OS). The top management has to decide whether to accept expected losses or to invest into technical security mechanisms in order to minimize the frequency of attacks, thefts as well as uncertainty. This work contributes to the development of an optimization model that aims to determine the optimal cost to be invested into security mechanisms deciding on the measure component of UFS attribute. Our model should be design in such way, the Read, Write & Execute automatically Protected, Detected and Corrected on RTOS. We have to optimize the system attacks and down time by implementing RWX ACM mechanism based on semi-group structure, mean while improving the throughput of the Business, Resources & Technology. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7059 
Volume: 13
Issue: 2
Page: 387-398
Publish at: 2015-02-01

A Novel Method for Sensing Obscene Videos using Scene Change Detection

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4207
Rashed Mustafa , Dingju Zhu
Video scene change detection has great importance of managing and analyzing large amount ofvideos. Traditionally this technique used for indexing, segmenting and categorizing different typesof videos. Very few works addressed to classify obscene using scene change detection method. Inthis research we proposed a simple approach for sensing objectionable videos by observing scenechanges into different video genres. Video scenes are grouped into set of key frames. Afteranalyzing duration of each scene and counting the number of key frames of designated scene, ithas been shown that obscene videos have infrequent scene changing nature. While in sports,dramas, music and action films have large number of scene changes. We used six types of videogenres and the decision has been made by setting a threshold based on extracted key. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i2.6873 
Volume: 13
Issue: 2
Page: 300-304
Publish at: 2015-02-01

Analysis and Estimation of Harmonics using Wavelet Technique

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4208
V Thiyagarajan , N.P. Subramanium
The paper develops an approach based on wavelet technique for the evaluation and estimation of harmonic contents of power system waveform. The proposed algorithm decomposes the signal waveforms into the uniform frequency sub-bands corresponding to the odd harmonic components of the signal. The proposed implementation of algorithm determines the frequency bands of harmonics which retain both the time and frequency relationship of the original waveforms and uses a method to suppress those harmonics. The wavelet algorithm is selected to obtain compatible output bands with the harmonic groups defined in the standards for power-supply systems. A comparative analysis will be done with the input and the results obtained from the wavelet transform (WT) for different measuring conditions and Simulation results are given. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i2.6983 
Volume: 13
Issue: 2
Page: 305-313
Publish at: 2015-02-01

Identifying of the Cielab Space Color for the Balinese Papyrus Characters

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4210
Made Sudarma
Balinese papyrus is one of the media to write the ideas from minstrels in ancient times. Currently, many ancient literatures which are written in the papyrus, that also very difficult to identify because the writings were beginning to rot or fade influenced by age. In this study takes the Balinese papyrus characters as its object. The improvement of the image quality in image processing of the characters here refers to the change for the quality of the image before its next development. There is the process of identifying the color space to spot the shape of the papyrus characters. The difference of the colors is so small so that it needs CIELab to process the identification out of its background and noise. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i2.7086 
Volume: 13
Issue: 2
Page: 321-328
Publish at: 2015-02-01

Study on Adaptive PID Control Algorithm Based on RBF Neural Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4205
Xuemei Qi , Jingdong Zhang
Aim at the limitation of traditional PID controller has certain limitation, the traditional PID control is often difficult to obtain satisfactory control performance, and the RBF neural network is difficult to meet the requirement of real-time control system. To overcome it, an adaptive PID control strategy based on (RBF) neural network is proposed in this paper. The results show that the proposed controller is practical and effective, because of the adaptability, strong robustness and satisfactory control performance. It is also revealed from simulation results that the proposed control algorithm is valid for DC motor and also provides the theoretical and experimental basis. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.6958 
Volume: 13
Issue: 2
Page: 287-291
Publish at: 2015-02-01
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