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29,922 Article Results

Brain-computer interface of focus and motor imagery using wavelet and recurrent neural networks

10.12928/telkomnika.v18i5.14899
Esmeralda C.; Universitas Jenderal Achmad Yani Djamal , Rifqi D.; Universitas Jenderal Achmad Yani Putra
Brain-computer interface is a technology that allows operating a device without involving muscles and sound, but directly from the brain through the processed electrical signals. The technology works by capturing electrical or magnetic signals from the brain, which are then processed to obtain information contained therein. Usually, BCI uses information from electroencephalogram (EEG) signals based on various variables reviewed. This study proposed BCI to move external devices such as a drone simulator based on EEG signal information. From the EEG signal was extracted to get motor imagery (MI) and focus variable using wavelet. Then, they were classified by recurrent neural networks (RNN). In overcoming the problem of vanishing memory from RNN, was used long short-term memory (LSTM). The results showed that BCI used wavelet, and RNN can drive external devices of non-training data with an accuracy of 79.6%. The experiment gave AdaDelta model is better than the Adam model in terms of accuracy and value losses. Whereas in computational learning time, Adam's model is faster than AdaDelta's model.
Volume: 18
Issue: 5
Page: 2748-2756
Publish at: 2020-10-01

Analysis of LTE physical channels overhead

10.12928/telkomnika.v18i5.16701
Haider Mohammed Turki; Ministry of Education Al-Hilfi
LTE Network is the common mobile technology these days around the world and all service providers seek to how improve the network capacity and deliver the best performance in terms of delivered data rates and coverage area. LTE network consists of many protocols that work together to establish network connectivity, these protocols add variable headers that contains many control information that the network needs to operate. At the same time these headers decrease the effective capacity of the network, so there is a need to optimize the overhead size that used in various channels. The study will illustrate the different overheads that effect on the network capacity and investigate the effect of different values on achieving the best network capacity.
Volume: 18
Issue: 5
Page: 2800-2806
Publish at: 2020-10-01

An efficient hardware logarithm generator with modified quasi-symmetrical approach for digital signal processing

10.11591/ijece.v10i5.pp4671-4678
Minh-Hong Nguyen
This paper presents a low-error, low-area FPGA-based hardware logarithm generator for digital signal processing systems which require high-speed, real time logarithm operations. The proposed logarithm generator employs the modified quasi-symmetrical approach for an efficient hardware implementation. The error analysis and implementation results are also presented and discussed. The achieved results show that the proposed approach can reduce the approximation error and hardware area compared with traditional methods.
Volume: 10
Issue: 5
Page: 4671-4678
Publish at: 2020-10-01

Algorithm of detection, classification and gripping of occluded objects by CNN techniques and Haar classifiers

10.11591/ijece.v10i5.pp4712-4720
Paula Useche , Robinson Jimenez-Moreno , Javier Martinez Baquero
The following paper presents the development of an algorithm, in charge of detecting, classifying and grabbing occluded objects, using artificial intelligence techniques, machine vision for the recognition of the environment, an anthropomorphic manipulator for the manipulation of the elements. 5 types of tools were used for their detection and classification, where the user selects one of them, so that the program searches for it in the work environment and delivers it in a specific area, overcoming difficulties such as occlusions of up to 70%. These tools were classified using two CNN (convolutional neural network) type networks, a fast R-CNN (fast region-based CNN) for the detection and classification of occlusions, and a DAG-CNN (directed acyclic graph-CNN) for the classification tools. Furthermore, a Haar classifier was trained in order to compare its ability to recognize occlusions with respect to the fast R-CNN. Fast R-CNN and DAG-CNN achieved 70.9% and 96.2% accuracy, respectively, Haar classifiers with about 50% accuracy, and an accuracy of grip and delivery of occluded objects of 90% in the application, was achieved.
Volume: 10
Issue: 5
Page: 4712-4720
Publish at: 2020-10-01

Performance evaluation of UE-controlled intelligent handover algorithm for natural disaster

10.11591/ijeecs.v20.i1.pp24-30
Azita Laily Yusof , Ainnur Eiza Azhar , Norsuzila Ya’acob
This paper proposes a UE-controlled intelligent handover algorithm for natural disaster. In this handover algorithm, two variables known as modified received signal strength (RSSm) and left over power (LoP) are identified. The RSSm is an improved formulation from RSS where distance fraction coefficient has been introduced. The fraction coefficient of 0.2 is used where the affected areas is reduced so that the users can receive good signal quality due to its location near to the base station. Meanwhile, the LoP also has been investigated to control power consumption of base station. In this research, 80% RSSm and 20% LoP has been chosen for the proposed handover algorithm as it can maintain good quality of service (QoS) for all users and also can prolong battery life.  From the simulation results obtained, the average number of handovers for the proposed handover algorithm outperformed the conventional natural disaster handover algorithm.
Volume: 20
Issue: 1
Page: 24-30
Publish at: 2020-10-01

A power efficient delta-sigma ADC with series-bilinear switch capacitor voltage-controlled oscillator

10.12928/telkomnika.v18i5.14034
D. S.; Karunya Institute of Technology & Sciences Shylu , P. Sam; Karunya Institute of Technology & Sciences Paul , D. Jackuline; Karunya Institute of Technology & Sciences Moni , J. Arolin Monica; Karunya Institute of Technology & Sciences Helan
In low-power VLSI design applications non-linearity and harmonics are a major dominant factor which affects the performance of the ADC. To avoid this, the new architecture of voltage-controlled oscillator (VCO) was required to solve the non-linearity issues and harmonic distortion. In this work, a 12-bit, 200MS/s low power delta-sigma analog to digital converter (ADC) VCO based quantizer was designed using switched capacitor technique. The proposed technique uses frequency to current conversion technique as a linearization method to reduce the non-linearity issue. Simulation result show that the proposed 12-bit delta-sigma ADC consumes the power of 2.68 mW and a total area of 0.09 mm² in 90 nm CMOS process.
Volume: 18
Issue: 5
Page: 2618-2627
Publish at: 2020-10-01

Neutral expression synthesis using kernel active shape model

10.11591/ijeecs.v20.i1.pp150-157
Marcella Peter , Jacey-Lynn Minoi , Suriani Ab Rahman
This paper presents a modified kernel-based Active Shape Model for neutralizing and synthesizing facial expressions. In recent decades, facial identity and emotional studies have gained interest from researchers, especially in the works of integrating human emotions and machine learning to improve the current lifestyle. It is known that facial expressions are often associated with face recognition systems with poor recognition rate. In this research, a method of a modified kernel-based active shape model based on statistical-based approach is introduced to synthesize neutral (neutralize) expressions from expressional faces, with the aim to improve the face recognition rate. An experimental study was conducted using 3D geometric facial datasets to evaluate the proposed modified method. The experimental results have shown a significant improvement on the recognition rates.
Volume: 20
Issue: 1
Page: 150-157
Publish at: 2020-10-01

Balancing a Segway robot using LQR controller based on genetic and bacteria foraging optimization algorithms

10.12928/telkomnika.v18i5.14717
Ibrahim K.; Ninevah University Mohammed , Abdulla I.; Ninevah University Abdulla
A two-wheeled single seat Segway robot is a special kind of wheeled mobile robot, using it as a human transporter system needs applying a robust control system to overcome its inherent unstable problem. The mathematical model of the system dynamics is derived and then state space formulation for the system is presented to enable design state feedback controller scheme. In this research, an optimal control system based on linear quadratic regulator (LQR) technique is proposed to stabilize the mobile robot. The LQR controller is designed to control the position and yaw rotation of the two-wheeled vehicle. The proposed balancing robot system is validated by simulating the LQR using Matlab software. Two tuning methods, genetic algorithm (GA) and bacteria foraging optimization algorithm (BFOA) are used to obtain optimal values for controller parameters. A comparison between the performance of both controllers GA-LQR and BFO-LQR is achieved based on the standard control criteria which includes rise time, maximum overshoot, settling time and control input of the system. Simulation results suggest that the BFOA-LQR controller can be adopted to balance the Segway robot with minimal overshoot and oscillation frequency.
Volume: 18
Issue: 5
Page: 2642-2653
Publish at: 2020-10-01

Glioblastomas brain tumour segmentation based on convolutional neural networks

10.11591/ijece.v10i5.pp4738-4744
Moh'd Rasoul Al-Hadidi , Bayan AlSaaidah , Mohammed Al-Gawagzeh
Brain tumour segmentation can improve diagnostics efficiency, rise the prediction rate and treatment planning. This will help the doctors and experts in their work. Where many types of brain tumour may be classified easily, the gliomas tumour is challenging to be segmented because of the diffusion between the tumour and the surrounding edema. Another important challenge with this type of brain tumour is that the tumour may grow anywhere in the brain with different shape and size. Brain cancer presents one of the most famous diseases over the world, which encourage the researchers to find a high-throughput system for tumour detection and classification. Several approaches have been proposed to design automatic detection and classification systems. This paper presents an integrated framework to segment the gliomas brain tumour automatically using pixel clustering for the MRI images foreground and background and classify its type based on deep learning mechanism, which is the convolutional neural network. In this work, a novel segmentation and classification system is proposed to detect the tumour cells and classify the brain image if it is healthy or not. After collecting data for healthy and non-healthy brain images, satisfactory results are found and registered using computer vision approaches. This approach can be used as a part of a bigger diagnosis system for breast tumour detection and manipulation.
Volume: 10
Issue: 5
Page: 4738-4744
Publish at: 2020-10-01

Y2O3:Ho3+ and ZnO:Bi3+: a selection for enhancing color quality and luminous flux of WLEDs

10.11591/ijece.v10i5.pp5162-5167
Nguyen Thi Phuong Loan , Nguyen Doan Quoc Anh
As the luminescence industry develops, the white light light-emitting diode (LED) package with a single chip and a single phosphor although produces good luminous flux but has a poor color rendering index (CRI) can no longer fulfill the requirements of modern lighting applications. Therefore, this research is conducted to response to the urgent demands of improving other lighting qualities of WLED while maintaining high luminous efficiency. To achieve this target, we applied the new WLED package, which contains multi-chips and multi-phosphor layers, and have obtained outstanding results in both CRI and luminous efficacy. Two types of phosphor used in the WLED package are Y2O3:Ho3+ and ZnO:Bi3+. A color configuration model is also developed to adjust the shading of the white-light LED module. The results of this research show that the triple-layer phosphorhas the best performance when applied in a white-light LED package, which is demonstrated through better color quality, CRI and luminous efficacy, The manufacturers can rely on this research to produce the optimal-quality WLED, or WLED that is appropriate to their quality demands.
Volume: 10
Issue: 5
Page: 5162-5167
Publish at: 2020-10-01

Developed approach for phase-based Eulerian video magnification

10.12928/telkomnika.v18i5.14321
Haider Ismael; University of Kerbala Shahadi , Zaid Jabbar; Al-Furat Al-Awsat Technical University Al-allaq , Hayder Jawad; Al-Furat Al-Awsat Technical University Albattat
This paper proposes a modification approach for phased-based EVM in order to reduce the processing time without effect the quality of the magnified video. The proposed approach applies a resizing process on the input video using Lanczos-3 algorithm. Then, it decomposes video frames using steerable pyramid to obtain multi-scale frame with its orientation. Subsequently, the resulted frames are filtered by temporal filters for specific bands and the filtered frames are multiplied by a magnification factor. Now, both the magnified regions and the unmagnified regions for each frame are added together. Finally, reconstructing the produced magnified multi-scale frames using the inverse steerable pyramid. The experimental results show that superiority of the proposed approach compares to the conventional phase-based EVM in processing time, where the processing time reduction about 60-65%. Furthermore, this approach does not affect on the video quality, which maintain it in the boundary of the conventional Phase-based EVM.
Volume: 18
Issue: 5
Page: 2391-2400
Publish at: 2020-10-01

Developing a real time navigation for the mobile robots at unknown environments

10.11591/ijeecs.v20.i1.pp500-509
Sarah Haider Abdulredah , Dheyaa Jasim Kadhim
This research deals with the feasibility of a mobile robot to navigate and discover its location at unknown environments, and then constructing maps of these navigated environments for future usage. In this work, we proposed a modified Extended Kalman Filter- Simultaneous Localization and Mapping (EKF-SLAM) technique which was implemented for different unknown environments containing a different number of landmarks. Then, the detectable landmarks will play an important role in controlling the overall navigation process and EKF-SLAM technique’s performance. MATLAB simulation results of the EKF-SLAM technique come with better performance as compared with an odometry approach performance in terms of measuring the mean square error, especially when increasing the number of landmarks. After that, we simulate and evaluate a mobile robot platform named TurtleBot2e in Gazebo simulator software to achieve the using of the SLAM technique for a different environment using the Rviz library which was built on Robot Operating System in Linux. The main conclusion comes with this work is the simulation and implementation of the SLAM technique using two software platforms separately (MATLAB and ROS) in different unknown environments containing a different number of landmarks so a few number of landmark will make the mobile robot loses its path.
Volume: 20
Issue: 1
Page: 500-509
Publish at: 2020-10-01

Design and implementation of robot control system for multistory buildings

10.12928/telkomnika.v18i5.15338
Naqaa Luqman; Northern Technical University Mohammed , Mothanna Sh.; Northern Technical University Aziz , Omar Ibrahim; Northern Technical University AlSaif
The advancement of technology, make robots have more attention from researchers to make life of mankind comfortable. This paper deals with the design of an itemized control system prepared for window cleaning/maintenance of towers and multistory buildings which can be aided to simulating human activities. These activities (washing, coating, wiping, climbing, and maintenance events) normally achieved by specialized personal. The designed control system was prepared to guide the units of the required job to move freely along the outside surface of a window with a fairly enough area and mediate time for achieving the desired goal. The system design is implemented using Arduino kit, due to facilities in program and control of cleaning windows through infer the stepper motor movement and rotation. The controller has been achieved as real time system (30 msec.), it is done throw control of three stepper motor by taken in consideration the speed of the motors (π/3000 rad/sec) and the time can be adjustable within the cleaning area that the device covering it.
Volume: 18
Issue: 5
Page: 2682-2689
Publish at: 2020-10-01

Optimal tuning of proportional integral controller for fixed-speed wind turbine using grey wolf optimizer

10.11591/ijece.v10i5.pp5251-5261
Aliyu Hamza Sule , Ahmad Safawi Mokhtar , Jasrul Jamani Bin Jamian , Attaullah Khidrani , Raja Masood Larik
The need for tuning the PI controller is to improve its performance metrics such as rise time, settling time and overshoot. This paper proposed the Grey Wolf Optimizer (GWO) tuning method of a Proportional Integral (PI) controller for fixed speed Wind Turbine. The objective is to overcome the limitations in using the PSO and GA tuning methods for tuning the PI controller, such as quick convergence occurring too soon into a local optimum, and the controller step input response. The GWO, the Particle Swarm Optimization (PSO), and the Genetic Algorithm (GA) tuning methods were implemented in the Matlab 2016b to search the optimal gains of the Proportional and Integral controller through minimization of the objective function. A comparison was made between the results obtained from the GWO tuning method against PSO and GA tuning techniques. The GWO computed the smallest value of the objective function minimized. It exhibited faster convergence and better time response specification compared to other methods. These and more performance indicators show the superiority of the GWO tuning method.
Volume: 10
Issue: 5
Page: 5251-5261
Publish at: 2020-10-01

Optimized output-based input shaping for control of single-link flexible manipulator using linear matrix inequality

10.11591/ijeecs.v20.i1.pp109-116
Nura Musa Tahir , Mustapha Muhammad , Bashir Bala Muhammad , Haliru Liman , Aminu Yahaya Zimit , Auwal Shehu Tijjani
Precise hub angle positioning due to tip deflections, flexible motions and under various payloads is enormous tasks in the control of single-link flexible manipulators. In this paper, output-based command shaping (OBCS) was designed using the system output for tip deflections and residuals vibrations suppression, and this was incorporated with a linear matrix inequality (LMI) closed-loop control scheme for precise hub angle positioning.  The robustness of the hybrid control scheme was tested by changing the payloads from 0g to 30g, and 50g. Simulation results showed that endpoint residuals vibrations and tip deflections due to flexible motions were suppressed and hence precise hub angle positioning under various payloads was achieved. Integral absolute error (IAE), integral square error (ISE) and time response analysis (TRA) were used as the performance indexes. Hence, the hybrid control scheme is simple and robust.
Volume: 20
Issue: 1
Page: 109-116
Publish at: 2020-10-01
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