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29,922 Article Results

A generalized switching function-based SVM algorithm of single-phase three-leg converter with active power decoupling

10.11591/ijece.v10i6.pp6189-6201
Watcharin Srirattanawichaikul
In this paper, a generalized switching function-based space vector modulation (SVM) algorithm is presented and evaluated to minimize the dc voltage utilization and the ac utility grid current total harmonic distortion. This paper explores the control and modulation techniques of a single-phase three-leg converter with an active power decoupling method, where a generalized SVM algorithm is proposed and evaluated for easy implementation in a digital control platform. The active power decoupling method with the proposed converter can be achieved via dependent control and modulation techniques. The control method is separated into the ac active power control part and the dc power ripple control part, which can maintain a unity power factor at the ac utility grid and reduced the double-frequency ripple power effect on the dc-side. Simulation results validate the performance of the modulation algorithm and its control and demonstrate the feasibility of the proposed power converter, as well as the two mentioned operation modes of the power converter.
Volume: 10
Issue: 6
Page: 6189-6201
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

Developing the scale on discipline expectations of students: A validity and reliability study

10.11591/ijere.v9i4.20585
Gülsen Özcan , Işıl Aktağ , Kaine Gülözer
The study aimed to develop a valid and reliable scale to measure the expectations of students from the discipline program implemented in their schools. The study was conducted with students studying in seven different high schools in fall semester of 2019-2020 school year. As a result of the Confirmatory Factor Analysis (CFA), a 5-point Likert scale with 3 dimensions and 22 items was established. It was revealed that the fit index values for the final form of the scale are χ2 = 360.92, df = 206, P = 0.00, RMSEA = 0.062, GFI = 0.86, AGFI = 0.82, CFI = 0.93, RMR = 0.063; NNFI = 0.92. Cronbach Alpha reliability test was used to test the reliability of the ultimate scale and test retest reliability value was used to measure the stability of the test. Reliability value for the whole test was determined as .823, for the factor of Effective Teaching Discipline Expectation as 717, for the factor of Behavioral Discipline Expectation as 596, and for the factor of Social Discipline Expectation as .636. Test retest reliability of the test was determined as .763. Upon the evaluation of the analyses made, it was concluded that scale on discipline expectations of students is a valid and reliable scale to measure the discipline expectations of the students studying in secondary education institutions in Turkey.
Volume: 9
Issue: 4
Page: 840-846
Publish at: 2020-12-01

Automated smart hydroponics system using internet of things

10.11591/ijece.v10i6.pp6389-6398
Ravi Lakshmanan , Mohamed Djama , Sathish Perumal , Raed Abdulla
This paper presents a design and implementation of an automated smart hydroponics system using internet of things. The challenges to be solved with this system are the increasing food demand in the world, the need of market of new sustainable method of farming using the Internet of Things. The design was implemented using NodeMcu, Node Red, MQTT and sensors that were chosen during component selection based on required parameters and sending it to the cloud to monitor and be processed. Investigation on previous works done and a review of Internet of Things and Hydroponic systems were done. First the prototype was constructed, programmed and tested, as well as sensors data between two different environments were taken and monitored on cloud-based web page with mobile application. Moreover, a bot has been introduced to control the supply chain and for notification purposes. The system improved its performance and allows it to successfully achieve the aim of the entire system implemented. There are some limitations which can be improved as future work such as including data science with the usage of the artificial intelligence to further improve the crops and get better outcome. Lastly to design end user platform to ease user interaction by using attractive design with no technical configuration involved.
Volume: 10
Issue: 6
Page: 6389-6398
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

Internet of things–based vital sign monitoring system

10.11591/ijece.v10i6.pp5891-5898
Alamsyah Alamsyah , Mery Subito , Mohammad Ikhlayel , Eko Setijadi
Wireless network technology-based internet of things (IoT) has increased significantly and exciting to study, especially vital sign monitoring (body temperature, heart rate, and blood pressure). Vital sign monitoring is crucial to carry out to strengthen medical diagnoses and the continuity of patient health. Vital sign monitoring conducted by medical personnel to diagnose the patient's health condition is still manual. Medical staff must visit patients in each room, and the equipment used is still cable-based. Vital sign examination like this is certainly not practical because it requires a long time in the process of diagnosis. The proposed vital sign monitoring system design aims to assist medical personnel in diagnosing the patient's illness. Vital sign monitoring system uses HRM-2511E sensor for heart detection, DS18b20 sensor for body temperature detection, and MPX5050DP sensor for blood pressure detection. Vital sign data processing uses a raspberry pi as a data delivery media-based internet of things (IoT). Based on the results of the vital sign data retrieval shows that the tool designed functioning correctly. The accuracy of the proposed device for body temperature is 99.51%, heart rate is 97.90%, and blood pressure is 97.69%.
Volume: 10
Issue: 6
Page: 5891-5898
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

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

Design of a controller for wheeled mobile robots based on automatic movement sequencing

10.12928/telkomnika.v18i6.16431
Holman Montiel; Universidad Distrital Francisco José de Caldas Ariza , Fredy H.; Universidad Distrital Francisco José de Caldas Martínez S. , Fernando Martínez; Universidad Distrital Francisco José de Caldas S.
There are many kinds of robots and among them the wheeled mobile robots (WMR) stand out, because they are relatively cheap and easy to build. These features make WMRs the test prototypes for control strategies or motion generation. In general, the controllers developed are based on sensory schemes that give an WMR the ability to travel through flat or obstructed environments. However, these strategies are highly reactive, i.e. they are based on the control-action scheme and are not adaptive; or, they are motion schemes built from simulations that assume the environmental conditions to determine the robot's path. In both cases, WMRs do not adapt perfectly to the change of environment, since the controller does not find appropriate movements for the  robot to move from one point to another. Therefore, this article proposesapartial solution to this problem, with a controller that generates sets of adaptive movements for an WMR to travel around its environment from the sensory perception information.
Volume: 18
Issue: 6
Page: 3088-3095
Publish at: 2020-12-01

Design and implement a smart system to detect intruders and firing using IOT

10.11591/ijece.v10i6.pp5932-5939
Hussam Jawad Kadhim , Mohammed Jabbar MohammedAmeen
The security system is essential for occupants' convenience and protection from intruders and fire. Theft and fire are the most important requirement for the security system. The advancement of wireless sensor networks using IOTs increased the features in a security system and play an important role in daily life. In this paper, the proposed system is divided into two units. The first one about security which use to take snapshots by a camera whenever there is fire or intruders in the security zone and mail it to the owner every three seconds by using Arduino configured with MATLAB program. MATLAB program plays the main role to coordinate between sensors and to turn on/off the cameras. The second unit is about controlling the appliances and also the main door by using AVR microcontroller configured by CVAVR software that connected with Bluetooth sensor and controlled by a smartphone by using the implementation software built-up in the smartphone. To arrival of the control unit, the user should send code from the software implementation to the framework that use to turn on /off the devices or open/close the door. This proposed system is designed and implemented in details in this paper.
Volume: 10
Issue: 6
Page: 5932-5939
Publish at: 2020-12-01

Improving face recognition by artificial neural network using principal component analysis

10.12928/telkomnika.v18i6.16335
Shatha; Northern Technical University A. Baker , Hesham Hashim; Northern Technical University Mohammed , Hanan A.; The General Directorate of Education in Nineveh Governorate Aldabagh
The face-recognition system is among the most effective pattern recognition and image analysis techniques. This technique has met great attention from academic and industrial fields because of its extensive use in detecting the identity of individuals for monitoring systems, security and many other practical fields. In this paper, an effective method of face recognition was proposed. Ten person's faces images were selected from ORL dataset, for each person (42) image with total of (420) images as dataset. Features are extracted using principle component analysis PCA to reduce the dimensionality of the face images. Four models where created, the first one was trained using feed forward back propagation learning (FFBBL) with 40 features, the second was trained using 50 features with FFBBL, the third was trained using the same features but using Elman Neural Network. For each person (24) image used as training set for the neural networks, while the remaining images used as testing set. The results showed that the proposed method was effective and highly accurate. FFBBL give accuracy of (98.33,97.14) with (40, 50) features respectively, while Elman gives (98.33, 98.80) for with (40, 50) features respectively.
Volume: 18
Issue: 6
Page: 3357-3364
Publish at: 2020-12-01

A Haptic feedback system based on leap motion controller for prosthetic hand application

10.11591/ijece.v10i6.pp5772-5778
Hussam K. Abdul-Ameer , Luma Issa Abdul-Kreem , Huda Adnan , Zahra Sami
Leap Motion Controller (LMC) is a gesture sensor consists of three infrared light emitters and two infrared stereo cameras as tracking sensors. LMC translates hand movements into graphical data that are used in a variety of applications such as virtual/augmented reality and object movements control. In this work, we intend to control the movements of a prosthetic hand via (LMC) in which fingers are flexed or extended in response to hand movements. This will be carried out by passing in the data from the Leap Motion to a processing unit that processes the raw data by an open-source package (Processing i3) in order to control five servo motors using a micro-controller board. In addition, haptic setup is proposed using force sensors (FSR) and vibro-motors in which the speed of these motors is proportional to the amount of the grasp force exerted by the prosthetic hand. Investigation for optimal placement of the FSRs on a prosthetic hand to obtain convenient haptic feedback has been carried out. The results show the effect of object shape and weight on the obtained response of the FSR and how they influence the locations of the sensors.
Volume: 10
Issue: 6
Page: 5772-5778
Publish at: 2020-12-01

Power losses reduction of power transmission network using optimal location of low-level generation

10.11591/ijece.v10i6.pp5586-5591
Marwa M. Marei , Manal H. Nawer
Due to the growth of demand for electric power, electric power loss reduction takes great attention for the power utility. In this paper, a low-level generation or Distributed Generation (DG) has been used for transmission power losses reduction. Karbala city transmission network (which is the case study) has been represented by using MATLAB m-file to study the load flow and the power loss for it. The paper proposed the Particle Swarm Optimization (PSO) technique in order to find the optimal number and allocation of DG with the objective to decrease power losses as possible. The results show the effect of the optimal allocation of DG on power loss reduction.
Volume: 10
Issue: 6
Page: 5586-5591
Publish at: 2020-12-01

Gender classification using custom convolutional neural networks architecture

10.11591/ijece.v10i6.pp5758-5771
Fadhlan Hafizhelmi Kamaru Zaman
Gender classification demonstrates high accuracy in many previous works. However, it does not generalize very well in unconstrained settings and environments. Furthermore, many proposed Convolutional Neural Network (CNN) based solutions vary significantly in their characteristics and architectures, which calls for optimal CNN architecture for this specific task. In this work, a hand-crafted, custom CNN architecture is proposed to distinguish between male and female facial images. This custom CNN requires smaller input image resolutions and significantly fewer trainable parameters than some popular state-of-the-arts such as GoogleNet and AlexNet. It also employs batch normalization layers which results in better computation efficiency. Based on experiments using publicly available datasets such as LFW, CelebA and IMDB-WIKI datasets, the proposed custom CNN delivered the fastest inference time in all tests, where it needs only 0.92ms to classify 1200 images on GPU, 1.79ms on CPU, and 2.51ms on VPU. The custom CNN also delivers performance on-par with state-of-the-arts and even surpassed these methods in CelebA gender classification where it delivered the best result at 96% accuracy. Moreover, in a more challenging cross-dataset inference, custom CNN trained using CelebA dataset gives the best gender classification accuracy for tests on IMDB and WIKI datasets at 97% and 96% accuracy respectively.
Volume: 10
Issue: 6
Page: 5758-5771
Publish at: 2020-12-01
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