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29,922 Article Results

Harnessing deep learning algorithms to predict software refactoring

10.12928/telkomnika.v18i6.16743
Mamdouh; Prince Sultan University Alenezi , Mohammed; Yarmouk University Akour , Osama; Yarmouk University Al Qasem
During software maintenance, software systems need to be modified by adding or modifying source code. These changes are required to fix errors or adopt new requirements raised by stakeholders or market place. Identifying thetargeted piece of code for refactoring purposes is considered a real challenge for software developers. The whole process of refactoring mainly relies on software developers’ skills and intuition. In this paper, a deep learning algorithm is used to develop a refactoring prediction model for highlighting the classes that require refactoring. More specifically, the gated recurrent unit algorithm is used with proposed pre-processing steps for refactoring predictionat the class level. The effectiveness of the proposed model is evaluated usinga very common dataset of 7 open source java projects. The experiments are conducted before and after balancing the dataset to investigate the influence of data sampling on the performance of the prediction model. The experimental analysis reveals a promising result in the field of code refactoring prediction
Volume: 18
Issue: 6
Page: 2977-2982
Publish at: 2020-12-01

Proportional-integral genetic algorithm controller for stability of TCP network

10.11591/ijece.v10i6.pp6225-6232
Mohammed Qasim Sulttan , Manal Hadi Jaber , Salam Waley Shneen
The life development and increase the number of internet users imposed an increase in data circulating on the internet network and then make the network more congestion. As a result of all this, some problems arose such as time delay in packets delivery, loss of packets, and exceed the buffer capacity for the middle routers. To overcome those problems, transmission control protocol and active queue management (TCP/AQM) have been used. AQM is the main approach used to control congestion and overcome those problems to improve network performance. This work proposes to use the proportional-integral (PI) controller with a genetic algorithm (GA) as an active queue manager for routers of the Internet. The simulation results show a good performance for managing the congestion with using proportional-integral genetic algorithm (GA-PI) controller better than the PI controller.
Volume: 10
Issue: 6
Page: 6225-6232
Publish at: 2020-12-01

Prevalence of hypertension: predictive analytics review

10.11591/ijai.v9.i4.pp576-583
Nur Arifah Mohd Nor , Azlinah Mohamed , Sofianita Mutalib
Hypertension is one of the non-communicable disease (NCD) that is classify as a global health risk with many critical health cases. Malaysia raise the same concern of the increasing NCD health problem. This paper aims to study the techniques used in predictive analytics namely healthcare and identify the factors of prevalence on hypertension. This review would give a better understanding of proper techniques and suggest the technique commonly used in predictive analytics especially for medical data and at the same time provide significant factors of prevalence hypertension. A total of 27 papers reviewed, several techniques on predictive analytics in healthcare are neural network, decision tree, naïve bayes, regression and support vector machine. The rise of economic growth and correlated socio-demographic have cause rise in hypertension problem over past years. The factors of hypertension depicted in this review namely gender, age, locality, family history, physically inactive and unhealthy life style not conform to any boundaries thus far. Thus, the choice on the technique and hypertension factors for predictive analytics is significant to come out with the significant predictive model. The predictive model on prevalence of hypertension may predict the severity of adult having hypertension in future work.
Volume: 9
Issue: 4
Page: 576-583
Publish at: 2020-12-01

Thermal exchange optimization based control of a doubly fed induction generator in wind energy conversion systems

10.11591/ijeecs.v20.i3.pp1252-1260
Mohammed Mazen Alhato , Soufiene Bouallègue
This paper presents a novel design method to attain the optimal parameters of proportional integral (PI) controllers for a doubly fed induction generator (DFIG) in wind energy based on a thermal exchange optimization (TEO) algorithm. Since the gains of PI controllers are usually selected by classical and tedious trials-errors based procedures, their tuning for such a wind energy converter is formulated as a constrained nonlinear optimization problem. Inspired by Newton’s law of cooling, the TEO algorithm is successfully applied to solve such a control problem under time-domain performances and operational constraints in order to extract the maximum available power. In order to assess the performances of the proposed TEO algorithm, a comparative study between the TEO algorithm and homologues ones is performed. Moreover, a statistical analysis using Friedman and Bonferroni-Dunn’s tests indicates that the TEO lgorithm gives very competitive results in comparison to the other reported metaheuristic algorithms.
Volume: 20
Issue: 3
Page: 1252-1260
Publish at: 2020-12-01

Temperature characteristics of FinFET based on channel fin width and working voltage

10.11591/ijece.v10i6.pp5650-5657
Yousif Atalla , Yasir Hashim , Abdul Nasir Abd. Ghafar , Waheb A. Jabbar
This paper shows the temperature sensitivity of FinFET and the possibility of using FinFET as a temperature Nano sensor based on Fin width of transistor. The multi-gate field effect transistor (MuGFET) simulation tool is used to examine the temperature effect on FinFET characteristics. Current-voltage characteristics with various temperatures and channel Fin width (WF= 5,10,20,40 and 80 nm) are at first simulated, the diode mode connection has been used in this study. The best temperature sensitivity of the FinFET is has been considered under the biggest ∆I at the working voltage VDD with range of 0–5 V. According to the results, the temperature sensitivity increased linearly with all the range of channel Fin width (5-80 nm), also, the lower gate Fin width (WF=5nm) with higher sensitivity can achieved with lower working voltage (VDD=1.25 V).
Volume: 10
Issue: 6
Page: 5650-5657
Publish at: 2020-12-01

An efficient IoT based biomedical health monitoring and diagnosing system using myRIO

10.12928/telkomnika.v18i6.14375
Rathy G.; NITTTR A. , Sivasankar; NITTTR P. , Tamara Z.; University of Information Technology and Communications Fadhil
With the growing and aging population, patient auto monitoring systems are becoming more popular. Smart sensors linked with the internet of things (IoT) make patients' auto monitoring system possible. Nowadays myRIO with LabVIEW is more popular for easy data acquisition, instrument control, and automation. This paper proposed myRIO and IoT based health monitoring and diagnosing system (HMDS) to acquire heartbeat rate, pulse, blood pressure (BP), temperature and activities of the patient using various smart sensors with more accuracy. The acquired raw data from the various sensors had been sent to the myRIO using ESP 8266 Wi-Fi module. The received raw data by the myRIO would be processed to the equivalent medical parameters using LabVIEW and the same might be transferred to the remote monitoring system (RMS) using cloud via a gateway. The abnormalities in the obtained data would be monitored and the diagnosis was made. The experimental setup was developed using various wearable sensors, ESP 8266, myRIO with LabVIEW and cloud with the gateway.
Volume: 18
Issue: 6
Page: 3050-3057
Publish at: 2020-12-01

Near-lossless image compression using an improved edge adaptive hierarchical interpolation

10.11591/ijeecs.v20.i3.pp1576-1583
Yenewondim Biadgie Sinshahw
In medical and scientific imaging, lossless image compression is recommended because the loss of minor details subject to medical diagnosis can lead to wrong diagniosis. On the other hand, lossy compression of medical images is required in the long run because a huge quantity of medical data needs remote storage. This, in turn, takes long time to search and transfer an image. Instead of thinking lossless or lossy image compression methods, near-loss image compression mehod can be used to compromise the two conflicting requirements. In the previous work, an edge adaptive hierarchical interpolation (EAHINT) was proposed for resolution scalable lossless compression of images. In this paper, it was enhanced for scalable near-less image compression. The interpolator of this arlgorithm swiches among one-directional, multi-directional and non-directional linear interpolators adaptively based on the strength of the edge in a 3x3 local casual context of the current pixel being predicted. The strength of the edge in local window was estimated using the variance of the the pixels in the local window. Although the actual predictors are still linear functions, the switching mechanism tried to deal with non-linear structures like edges. Simulation results demonstrate that the improved interpolation algorithm has better compression ratio over the the exsisting the original EAHINT algorithm and JPEG-Ls image compression standard. 
Volume: 20
Issue: 3
Page: 1576-1583
Publish at: 2020-12-01

High frequency signal injection method for sensorless permanent magnet synchronous motor drives

10.12928/telkomnika.v18i6.16280
Tan Jiunn; Universiti Teknikal Malaysia Melaka. (UTeM) Lin , Jurifa Mat; Universiti Teknikal Malaysia Melaka. (UTeM) Lazi , Zulkifilie; Universiti Teknikal Malaysia Melaka. (UTeM) Ibrahim , Md Hairul Nizam; Universiti Teknikal Malaysia Melaka. (UTeM) Talib , Azrita; Universiti Teknikal Malaysia Melaka Alias , Ahmad Shukri; Universiti Pertahanan Nasional Abu Hasim
The objective of this project is to design a high frequency signal injection method for sensorless control of permanent magnet synchronous motor (PMSM) drives. Generally, the PMSM drives control requires the appearance of speed and positon sensor to measure the motor speed hence to feedback the information for variable speed drives operation. The usage of the sensor will increase the size, cost, extra hardwire and feedback devices. Therefore, there is motivation to eliminate this type of sensor by injecting high frequency signal and utilizing the electrical parameter from the motor so that the speed and positon of rotor can be estimated. The proposed position and speed sensorless control method using high frequency signal injection together with all the power electronic circuit are modelled using Simulink. PMSM sensorless driveis simulated and the results are analyzed in terms of speed, torque and stator current response without load disturbance but under the specification of varying speed, forward to reverse operation, reverse to forward operation and step change in reference speed. The results show that the signal injection method performs well during start-up and low speed operation.
Volume: 18
Issue: 6
Page: 3315-3323
Publish at: 2020-12-01

Broadband planar 90 degrees loaded-stub phase shifter

10.12928/telkomnika.v18i6.15691
S. El; Hassan 1st University Marini , R.; Hassan 1st University Mandry , J.; Hassan 1st University Zbitou , A.; Hassan 1st University Errkik , A.; Hassan 1st University Tajmouati , M.; Microwave Group ESEO Latrach
The differential phase shifter is an interesting four-port passive microwave network composed of two separate lines, the main line and the reference line, and providing stable phase difference between the two output signals over the specified bandwidth of interest. The most common differential phase shifter is the coupled-line Schiffman phase shifter. In this paper, a novel 90 degrees differential microstrip phase shifter configuration employing a half wavelength transmission line loaded with three open stubs is presented, the proposed design could achieve excellent performance with low phase variation over a wide bandwidth compared to the standard Schiffman phase shifter. The simulated results accomplished with the use of CST Microwave Studio and advanced design system (ADS), were found to be in good agreement and have shown that the proposed loaded-stub phase shifter achieved less than 1.1 dB insertion loss, greater than 13 dB return loss and constant 90±5 degrees phase shift over an 89 percent bandwidth.
Volume: 18
Issue: 6
Page: 2834-2841
Publish at: 2020-12-01

Color image encryption based on chaotic shit keying with lossless compression

10.11591/ijece.v10i6.pp5736-5748
Ashwaq T. Hashim , Bahaa D. Jalil
In order to protect valuable data from undesirable readers or against illegal reproduction and modifications, there have been various data encryption techniques. Many methods are developed to perform image encryption. The use of chaotic map for image encryption is very effective, since it increase the security, due to its random behavior. The most attractive feature of deterministic chaotic systems is he extremely unexpected and random-look nature of chaotic signals that may lead to novel applications. A novel image encryption algorithm based on compression and hyper chaotic map techniques is proposed. Firstly the image is decomposed into three subbands R, G, and B then each band is compressed using lossless technique. The generated chaotic sequences from the 3D chaotic system are employed to code the compressed results by employing the idea of chaotic shift encoding (CSK) modulation to encode the three bands to generate the encrypted image. The experiments show that the proposed method give good results in term of security, feasibility, and robustness.
Volume: 10
Issue: 6
Page: 5736-5748
Publish at: 2020-12-01

Parallel implementation of pulse compression method on a multi-core digital signal processor

10.11591/ijece.v10i6.pp6541-6548
Abdessamad Klilou , Assia Arsalane
Pulse compression algorithm is widely used in radar applications. It requires a huge processing power in order to be executed in real time. Therefore, its processing must be distributed along multiple processing units. The present paper proposes a real time platform based on the multi-core digital signal processor (DSP) C6678 from Texas Instruments (TI). The objective of this paper is the optimization of the parallel implementation of pulse compression algorithm over the eight cores of the C6678 DSP. Two parallelization approaches were implemented. The first approach is based on the open multi processing (OpenMP) programming interface, which is a software interface that helps to execute different sections of a program on a multi core processor. The second approach is an optimized method that we have proposed in order to distribute the processing and to synchronize the eight cores of the C6678 DSP. The proposed method gives the best performance. Indeed, a parallel efficiency of 94% was obtained when the eight cores were activated.
Volume: 10
Issue: 6
Page: 6541-6548
Publish at: 2020-12-01

Offline signatures matching using haar wavelet subbands

10.12928/telkomnika.v18i6.17069
Zinah S.; Mustansiriyah University Abduljabbar , Zainab J.; University of Baghdad Ahmed , Noor; Mustansiriyah University Khalid Ibrahim
The complexity of multimedia contents is significantly increasing in the current world. This leads to an exigent demand for developing highly effective systems tosatisfy human needs. Until today, handwritten signature considered an important means that is used in banks and businesses to evidence identity, so there are many works triedto develop a method for recognition purpose. This paper introduced an efficient technique for offline signature recognition depending on extracting the local feature by utilizing the haar wavelet subbands and energy. Three different setsof features are utilized by partitioning the signature image into non overlapping blocks where different block sizes are used. CEDAR signature database is used asa dataset for testing purpose. The results achieved by this technique indicate a high performance in signature recognition.
Volume: 18
Issue: 6
Page: 2903-2910
Publish at: 2020-12-01

The assesement of the shunt active filter efficiency under varied power supply source and load parameters

10.11591/ijece.v10i6.pp5621-5630
Yuriy Sychev , Boris Abramovich , Veronika Prokhorova
The results of theoretical and experimental studies on the problems of effective application of shunt active filters for power quality improvement and electromagnetic compatibility ensuring were presented in this article. Based on the different theories and methods, the most effective and well-studied control algorithms of shunt active filters were determined and analyzed to ensure their effective application in distributed generation systems and combined power supply systems. Mathematical and computer simulation models of shunt active filters with different control algorithms in distributed generation systems and combined power supply systems were developed. According to the results of mathematical modeling and computer simulation, the dependences were detected, reflecting the influences of internal and external parameters on the factors, determining the efficiency of the correction of power quality indicators. The range of permissible changes in the parameters of shunt active filters by saving the required efficiency level of power quality correction was detected under varied power supply system characteristics, load parameters and also in hybrid structures. The adaptive algorithm of the shunt active filter functioning under varied application conditions for automated power quality improvement is developed on the basis
Volume: 10
Issue: 6
Page: 5621-5630
Publish at: 2020-12-01

Optimization of detection of a single line to ground fault based on ABCNN algorithm

10.11591/ijai.v9.i4.pp623-629
Feryal Ibrahim Jabbar , DurMuhammad Soomro , Adnan Hasan Tawafan , Mohd Noor bin Abdullah , Nur Hanis binti Mohammad Radzi , Mazhar Hussain Baloch
One of the most faults found in the electrical distribution network is a single line to ground fault (SLGF). It can be detected and rectified through many methods. The utilization of Peterson coil (PC), reduces the electrical arcs and make the distribution network safe from damage in contrast to the cost value. This paper focuses on the method for its detection on higher and lower values of the ground fault current (GFC). Moreover, it will identify the capacitance and earth leakage of earthling network lines as well as calculate the opposing inductance to compensate for the cause. It also presents the selfextinguishing of GFC by controlling PC through one of the novel optimization techniques called adaptive and artificial bee colony with network neural (ABCNN) to improve the algorithm's performance, like optimization efficiency, speed, solution, and iteration. As a result, the determination of the GFC equals the sound phase current. Also, the extinguishing of an electric arc results in a short time compared with classical methods. The significant advantage of this research is the increment in the system's reliability, protection of devices as well as saving in copper cost. MATLAB was used to carry out this research. For the validity, the proposed algorithm results were compared with the classical method by creating faults on separate phases also.
Volume: 9
Issue: 4
Page: 623-629
Publish at: 2020-12-01

Direct split-radix algorithm for fast computation of type-II discrete Hartley transform

10.12928/telkomnika.v18i6.16100
Mounir Taha; University of Tikrit Hamood
In this paper, a novel split-radix algorithm for fast calculation the discrete Hartley transform of type-II (DHT-II) is intoduced. The algorithm is established through the decimation in time (DIT) approach, and implementedby splitting a length N of DHT-II into one DHT-II of length N/2 for even-indexed samples and two DHTs-II of length N/4 for odd-indexed samples. The proposed algorithm possesses the desired properties such as regularity, inplace calculation and it is represented by simple closed form decomposition sleading to considerable reductions in the arithmetic complexity compared to the existing DHT-II algorithms. Additionally, the validity of the proposed algorithm has been confirmed through analysing the arithmetic complexityby calculating the number of real additions and multiplications and associating it with the existing DHT-II algorithms.
Volume: 18
Issue: 6
Page: 3067-3072
Publish at: 2020-12-01
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