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29,922 Article Results

Multi-objective based economic environmental dispatch with stochastic solar-wind-thermal power system

10.11591/ijece.v10i5.pp4543-4551
Surender Reddy Salkuti
This paper presents an evolutionary based technique for solving the multi-objective based economic environmental dispatch by considering the stochastic behavior of renewable energy resources (RERs). The power system considered in this paper consists of wind and solar photovoltaic (PV) generators along with conventional thermal energy generators. The RERs are environmentally friendlier, but their intermittent nature affects the system operation. Therefore, the system operator should be aware of these operating conditions and schedule the power output from these resources accordingly. In this paper, the proposed EED problem is solved by considering the nonlinear characteristics of thermal generators, such as ramp rate, valve point loading (VPL), and prohibited operating zones (POZs) effects. The stochastic nature of RERs is handled by the probability distribution analysis. The aim of proposed optimization problem is to minimize operating cost and emission levels by satisfying various operational constraints. In this paper, the single objective optimization problems are solved by using particle swarm optimization (PSO) algorithm, and the multi-objective optimization problem is solved by using the multi-objective PSO algorithm. The feasibility of proposed approach is demonstrated on six generator power system.
Volume: 10
Issue: 5
Page: 4543-4551
Publish at: 2020-10-01

The options in remote phosphor structure for better white LEDs color quality

10.12928/telkomnika.v18i5.13526
Nguyen Thi Phuong; Posts and Telecommunications Institute of Technology Loan , Nguyen Doan Quoc; Ton Duc Thang University Anh
The WLEDs configuration with remote phosphor layers has higher luminescent performance than WLEDs with dispense coating or conformal coating and is applied for many modern devices. However, managing the chromatic performance of lighting structure with remote phosphor materials is a challenging objective that demands more research. This has inspired the usage of multi phosphor configurations with distance in between the layers to improve color quality. The results of this manuscript can support the manufacturers in choosing the optimal configuration for optical performance in LEDs devices with more than one phosphor material. The simulated model used in the experments is 6500 K CCT WLEDs, which results show the triple-layers structure is more favorable in terms of color quality and light output. Besides, a notable reduction occurs in color deviation means that chromatic stability is also enhanced in WLEDs with three phosphor layers. Through experimental results, which were confirmed by the Mie-scattering theory, this research offers valuable approach and details to produce better WLEDs.
Volume: 18
Issue: 5
Page: 2606-2611
Publish at: 2020-10-01

Distributed gateway-based load balancing in software defined network

10.12928/telkomnika.v18i5.14851
Halimah; Telkom University Tussyadiah , Ridha Muldina; Telkom University Negara , Danu Dwi; Telkom University Sanjoyo
To achieve an internet with high availability and reliability, needs two or more data paths so the process for sending data can be faster. Load balancing is often plays a significant role for this technique to properly utilized every gateway in the network. This research, implemented load balancing in software defined network architecture using floodlight controller. Evaluation is done by measuring QoS (delay, bit rate, packet rate, packet success rate) while sending various traffics through the network such as UDP Flow, VoIP, and DNS. Performance of load balancer is work well, because the results after load balancing is better than before. Which is the value of delay after load balancing is decreased about 30-55% compared to before load balancing, also the values of bit rate, packet rate dan packet success rate after load balancing is increased about 10-30% compared to before load balancing.
Volume: 18
Issue: 5
Page: 2352-2361
Publish at: 2020-10-01

Filtering and analyzing normal and abnormal electromyogram signals

10.11591/ijeecs.v20.i1.pp176-184
S. Elouaham , A. Dliou , Mostafa Laaboubi , R. Latif , N. Elkamoun , H. Zougagh
The electromyogram (EMG) is an important measurement to assess the health of muscles and the nerve cells that control them. The appearance of noise in electromyography (EMG) signals may unquestionably minimize the efficiency of the analysis of the signal. The denoising techniques are inevitable for minimizing noise affecting the EMG signals; these methods are complete ensemble empirical mode decompositions with adaptive noise (CEEMDAN) and the ensemble empirical mode decomposition (EEMD). After that, we analyze these signals by time-frequency techniques as Adaptive optimal kernel (AOK) and Choi-Williams. Firstly, the obtained results illustrate the effectiveness of the CEEMDAN that permits reducing noise that interferes with normal and abnormal EMG signals with higher resolution than other techniques used as EEMD. Secondly, they show that the AOK technique is adapted to the detection and classification of these types of normal and abnormal EMG signals by the good localization of the motor unit action potentials (MUAPs) in the time-frequency plan. This paper shows the efficiency of the combination of the AOK and CEEMDAN techniques in analyzing the EMG signals. 
Volume: 20
Issue: 1
Page: 176-184
Publish at: 2020-10-01

Performance analysis of millimeter wave 5G networks for outdoor environment: propagation perspectives

10.11591/ijeecs.v20.i1.pp214-221
Naser Al-Falahy , Mohammed AlMahamdy , Ali M. Mahmood
To cope with the massive growth in global mobile data traffic for 2020 and beyond, the fifth generation (5G) system is required to be developed as the current 4G system is expected to fall short behind the provision of such growth. 5G systems is anticipated to use millimeter wave (mm-wave) frequency bands (20 to 90) GHz, due to the availability of wide chunk of unexploited bandwidth. This is revolutionary step to use these bands because of their very different propagation conditions, atmospheric absorption and hardware constraints. However, such challenges could be compensated by means of beamforming/beamsteering and larger antenna array. In this paper, a comparative study aided with ray-tracing simulation has been performed to assess the feasibility of mm-wave in 5G system. Propagation characteristics of the 28GHz and 73 GHz bands have been studied and compared in a street canyon outdoor environment to simulate 5G outdoor mobile access. Simulation results were shown along with their comparison for both of the aforementioned frequencies. The results of propagation comparison have been reported in terms of path loss, k-factor, delay spread and received power for both 28 and 73 GHz bands.
Volume: 20
Issue: 1
Page: 214-221
Publish at: 2020-10-01

Comparative study on machine learning algorithms for early fire forest detection system using geodata

10.11591/ijece.v10i5.pp5507-5513
Zouiten Mohammed , Chaaouan Hanae , Setti Larbi
Forest fires have caused considerable losses to ecologies, societies and economies worldwide. To minimize these losses and reduce forest fires, modeling and predicting the occurrence of forest fires are meaningful because they can support forest fire prevention and management. In recent years, the convolutional neural network (CNN) has become an important state-of-the-art deep learning algorithm, and its implementation has enriched many fields. Therefore, a competitive spatial prediction model for automatic early detection of wild forest fire using machine learning algorithms can be proposed. This model can help researchers to predict forest fires and identify risk zonas. System using machine learning algorithm on geodata will be able to notify in real time the interested parts and authorities by providing alerts and presenting on maps based on geographical treatments for more efficacity and analyzing of the situation. This research extends the application of machine learning algorithms for early fire forest prediction to detection and representation in geographical information system (GIS) maps.
Volume: 10
Issue: 5
Page: 5507-5513
Publish at: 2020-10-01

Modelling turn away intention of information technology professionals in Bangladesh: a partial least squares approach

10.11591/ijece.v10i5.pp4973-4981
Md. Shohel Arman , Rozina Akter , Imran Mahmud , T. Ramayah
Despite, Bangladesh produces many IT graduates each year but only one tenth of total graduates contribute in IT development sector. In order to keep the contribution to economy through IT development, it is crucial for IT industry to know the factors that influence turn away of IT graduates. In this paper, building upon role stress theory, we develop a research model to explore the influence of workplace exhaustion and threat of professional obsolescence (TPO). Data were gathered from 185 IT professionals from 15 different IT companies through survey questionnaire. The structural equation modelling technique was used to test the paths. The results suggests that strong influence of TPO on turn-away intentions. Result also suggests significant roles of work overload, family-career conflict and control over career and workplace exhaustion on turn away intention. This paper contributes to the body of work dedicated to helping us better understand the turn away behaviour from the workplace exhaustion and TPO perspectives. From the viewpoint of practice, this research sheds light on some of the challenges that the IT industry might face when making strategy and policy to control turn away from IT profession in Bangladesh
Volume: 10
Issue: 5
Page: 4973-4981
Publish at: 2020-10-01

Intercept probability analysis in DF time switching full-duplex relaying network with impact of Co-channel interference at the eavesdropper

10.12928/telkomnika.v18i5.13861
Pham Minh; Industrial University of Ho Chi Minh City Nam , Phu Tran; Ton Duc Thang University Tin , Minh; Ton Duc Thang University Tran
In this research, we propose and investigate intercept probability analysis in DF time switching relaying full-duplex with impact of Co-channel interference at the eavesdropper. In the beginning stage, we present the DF time switching relaying full-duplex with the Impact of Co-channel interference at the eavesdropper. Furthermore, the closed-form expression of the intercept probability (IP) is analyzed and derived in connection with the primary system parameters. Finally, the Monte Carlo simulation is performed for verifying the correctness of the analytical section. From the research results, a novel solution and some recommendations can be proposed for the communication network in the near future.
Volume: 18
Issue: 5
Page: 2335-2340
Publish at: 2020-10-01

Real time FPGA implemnation of SAR radar reconstruction system based on adaptive OMP compressive sensing

10.11591/ijeecs.v20.i1.pp185-196
Eslam Ashraf , Ashraf A. M. Khalaf , Sara M. Hassan
Synthetic aperture radar (SAR) is an imaging system based on the processing of radar echoes. The produced images have a huge amount of data which will be stored onboard or transmitted as a digital signal to the ground station via downlink to be processed. Therefore, some methods of compression on the raw images provides an attractive option for SAR systems design. One of these techniques which used for image reconstruction is the orthogonal matching pursuit (OMP). OMP is an iterative algorithm which need high computational operations. The computational complexity of the iterative algorithms is high due to updating operations of the measurement vector and large number of iterations that are used to reconstruct the images successfully. This paper presents a new adaptive OMP algorithm to overcome this issue by using certain threshold. The new adaptive OMP algorithm is compared with the classical OMP algorithm using the receiver operating characteristic (ROC) curves. The MATLAB simulations show that the new adaptive OMP algorithm improves the probability of detection at lower SNRs, reduce the computational operations as well as the number of required iterations. FPGA implementation of both the classical OMP and the adaptive OMP algorithm are also presented in this paper.
Volume: 20
Issue: 1
Page: 185-196
Publish at: 2020-10-01

Cancerous lung nodule detection in computed tomography images

10.12928/telkomnika.v18i5.15523
Ayman Abu; Applied Science Private University Baker , Yazeed; Al Ain University of Science and Technology Ghadi
Diagnosis the computed tomography images (CT-images) is one of the images that may take a lot of time in diagnosis by the radiologist and may miss some of cancerous nodules in these images. Therefore, in this paper a new novel enhancement and detection cancerous nodule algorithm is proposed to diagnose a CT-images. The novel algorithm is divided into three main stages. In first stage, suspicious regions are enhanced using modified LoG algorithm. Then in stage two, a potential cancerous nodule was detected based on visual appearance in lung. Finally, five texture features analysis algorithm is implemented to reduce number of detected FP regions. This algorithm is evaluated using 60 cases (normal and cancerous cases), and it shows a high sensitivity in detecting the cancerous lung nodules with TP ration 97% and with FP ratio 25 cluster/image.
Volume: 18
Issue: 5
Page: 2432-2438
Publish at: 2020-10-01

On the performance of energy harvesting AF partial relay selection with TAS and outdated channel state information over identical channels

10.11591/ijece.v10i5.pp5296-5305
Kehinde O. Odeyemi , Pius A. Owolawi
Energy scarcity has been known to be one of the most noticeable challenges in wireless communication system. In this paper, the performance of an energy harvesting based partial relay selection (PRS) cooperative system with transmit antenna selection (TAS) and outdated channel state information (CSI) is investigated. The system dual-hops links are assumed to follow Rayleigh distribution and the relay selection is based on outdated CSI of the first link. To realize the benefit of multiple antenna, the amplified-and-forward (AF) relay nodes then employs the TAS technique for signal transmission and signal reception is achieved at the destination through maximum ratio combining (MRC) scheme. Thus, the closed-form expression for the system equivalent end-to-end cumulative distribution function (CDF) is derived. Based on this, the analytical closed-form expressions for the outage probability, average bit error rate, and throughput for the delay-limited transmission mode are then obtained. The results illustrated that the energy harvesting time, relay distance, channel correlation coefficient, the number of relay transmit antennas and destination received antenna have significant effect on the system performance. Monte-carol simulation is employed to validate the accuracy of the derived expressions.
Volume: 10
Issue: 5
Page: 5296-5305
Publish at: 2020-10-01

A rigorous user needs experience evaluation method based on software quality standards

10.12928/telkomnika.v18i5.16061
Mohammad; Prince Sultan University Zarour
Our lives, nowadays, are digital. We, as humans, are using software applications in all our life aspects to meet our daily objectives and fulfill our needs. Software solutions that comprise mobile apps are widely spread, users can select from hundreds of available software solutions that fit their needs. Accordingly, user needs are becoming intricate and the software organizations are competing high to satisfy user requirements and the desires for better quality. This competition is not about satisfying the functional requirements but also satisfy user experience as well. Accordingly, studying, measuring, and improving user experience is crucial for the success of any software product. This research focuses on evaluating user experience needs by developing user experience needs evaluation method based on three main disciplines the user experience framework, the evaluation theory concept, and the ISOsoftware quality standards ISO/IEC 25022 and ISO/IEC 25023. Although these disciplines are available in the literature, they are not linked together to complete the mosaic picture of developing a UX evaluation method. Linking there three disciplines led to systematically identify the necessary evaluation criteria to evaluate user needs experience.
Volume: 18
Issue: 5
Page: 2787-2799
Publish at: 2020-10-01

A new factor for fabrication technologies evaluation for silicon nanowire transistors

10.12928/telkomnika.v18i5.12121
Yasir; Tishk International University (TIU) Hashim , Mohammed Nazmus; Universiti Malaysia Pahang Shakib
This paper reviews the fabrication technologies of silicon nanowire transistors (SiNWTs) and rapidly development in this area, as this paper presents various types of SiNWT structures, development of SiNWT properties and different applications until nowadays.  This research provides a good comparison among fabrication technologies of SiNWTs depending on a new factor DIF, this factor depends on the size of channel and power consumption in channel. As a result of this comparison, the best technology to use in the future to fabricate silicon nano transistors for future ICs is AFM nanolithography.
Volume: 18
Issue: 5
Page: 2597-2605
Publish at: 2020-10-01

Performance evaluation of decode and forward cooperative diversity systems over nakagami-m fading channels with non-identical interferers

10.11591/ijece.v10i5.pp5316-5328
Mamoun F. Al-Mistarihi , Rami Mohaisen , Khalid A. Darabkh
The deficiencies of regular cooperative relaying schemes were the main reason behind the development of Incremental Relaying (IR). Fixed relaying is one of the regular cooperative relaying schemes and it relies on using the relay node to help in transmitting the signal of the source towards the destination despite the channel’s condition. However, adaptive relaying methods allocate the channel resources efficiently; thus, such methods have drawn the attention of researchers in recent years. In this study, we analyze a two-hop Decode-and-Forward (DF) IR system’s performance via Nakagami-m fading channels with the existence of the several L distinguishable interferers placed close to the destination which diminishes the overall performance of the system due to the co-channel interference. Tight formulas for the Bit Error Rate (BER) and the Outage Probability (OP) are drawn. The assumptions are consolidated by numerical calculations.
Volume: 10
Issue: 5
Page: 5316-5328
Publish at: 2020-10-01

Range expansion method on heterogeneous network to increase picocell coverage

10.12928/telkomnika.v18i5.14640
Hadi; Telkom University Supriadi , Hasanah; Telkom University Putri
In this study, picocell planning was carried out on heterogeneous networks by applying the range expansion method. The case study was conducted in Coblong Subdistrict-Bandung on the 1800 MHz frequency. Heterogeneous network (HetNet) is a system that combines microcell networks and small cell networks (picocell and femtocell). The application of the range expansion method in picocell was aimed to broaden the scope of picocell. For the simulation, Atoll 3.3.0 software with observational parameters was implemented, including RSRP, SINR, throughput, and user connected. The planning results showed that the application of expansion method increased the coverage and quality of network, where the RSRP value ≥ -90 dBm was 97.72%, SINR ≥ 5 dB was 70.99%, uplink throughput was 17.80 Mbps, downlink throughput was 21.37 Mbps, and user connected was 99.2%.
Volume: 18
Issue: 5
Page: 2341-2351
Publish at: 2020-10-01
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