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31,456 Article Results

Test platform for electronic control units of high-performance safety-critical multi actuator systems

10.11591/ijece.v10i4.pp4053-4072
Giovanni Bucci , Fabrizio Ciancetta , Edoardo Fiorucci , Simone Mari
In this paper we are mostly concerned with the problem of testing electronic control units of synchronized electric power actuators. This task is particularly complex for safety critical applications, where it is crucial that the control system properly reacts in response to the faults, that are hard to reproduce and verify. A cost-effective flexible and reconfigurable test platform is proposed, discussing its architecture and implementation. The proposed system facilitates the phase of definition and development of the electronic control unit, allowing the interfacing towards both hydraulic and electromechanical actuators, and having a high flexibility as regards the I/O signals. Some results, obtained during the laboratory test activity, are also presented.
Volume: 10
Issue: 4
Page: 4053-4072
Publish at: 2020-08-01

A data estimation for failing nodes using fuzzy logic with integrated microcontroller in wireless sensor networks

10.11591/ijece.v10i4.pp3623-3634
Saad Al-Azzam , Ahmad Sharieh
Continuous data transmission in wireless sensor networks (WSNs) is one of the most important characteristics which makes sensors prone to failure. a backup strategy needs to co-exist with the infrastructure of the network to assure that no data is missing. The proposed system relies on a backup strategy of building a history file that stores all collected data from these nodes. This file is used later on by fuzzy logic to estimate missing data in case of failure. An easily programmable microcontroller unit is equipped with a data storage mechanism used as cost worthy storage media for these data. An error in estimation is calculated constantly and used for updating a reference “optimal table” that is used in the estimation of missing data. The error values also assure that the system doesn’t go into an incremental error state. This paper presents a system integrated of optimal data table, microcontroller, and fuzzy logic to estimate missing data of failing sensors. The adapted approach is guided by the minimum error calculated from previously collected data. Experimental findings show that the system has great potentials of continuing to function with a failing node, with very low processing capabilities and storage requirements.
Volume: 10
Issue: 4
Page: 3623-3634
Publish at: 2020-08-01

Active power ouptut optimization for wind farms and thermal units by minimizing the operating cost and emissions

10.11591/ijece.v10i4.pp3412-3422
Nazha Cherkaoui , Abdelaziz Belfqih , Faissal El Mariami , Jamal Boukherouaa , Abdelmajid Berdai
In recent years, many works have been done in order to discuss economic dispatch in which wind farms are installed in electrical grids in addition to conventional power plants. Nevertheless, the emissions caused by fossil fuels have not been considered in most of the studies done before. In fact, thermal power plants produce important quantities of emissions for instance, carbon dioxide (CO2) and sulphur dioxide (SO2) that are harmful to the environment. This paper presents an optimization algorithm with the objective to minimize the emission levels and the production cost. A comparison of the results obtained with different optimization methods leads us to opt for the grey wolf optimizer technique (GWO) to use for solving the proposed objective function. First, the method used to estimate the wind power of a plant is presented. Second, the economic dispatch models for wind and thermal generators are presented followed by the emission dispatch model for the thermal units.Then, the proposed objective function is formulated. Finally, the simulation results obtained by applying the GWO and other known optimization techniques are analysed and compared.
Volume: 10
Issue: 4
Page: 3412-3422
Publish at: 2020-08-01

Voltage profile enhancement in distribution network using static synchronous compensator STATCOM

10.11591/ijece.v10i4.pp3367-3374
Mohammed Yahya Suliman
STATCOM is one of FACTS devices that used as regulator for transmission and distribution systems which works for reactive power compensation. STATCOM utilisation in distribution system mostly for enhancing the profile of voltage, where used for adjusting the disturbance voltage by injecting into the system a controllable voltage. This paper present a Fuzzy controller based on STATCOM to enhance the voltage profile in distribution network. The controller of STATCOM has simulated for different types of abnormal load conditions of balance and unbalance load. The results of simulation show ability of proposed design to enhance the load voltage which was 96% of the nominal value.
Volume: 10
Issue: 4
Page: 3367-3374
Publish at: 2020-08-01

Thermal comfort control via air conditioning system using fuzzy neural network feedback controller

10.11591/ijeecs.v19.i2.pp586-592
Somaye A. Mohamadi , Abdulraheem J. Ahmed
Despite their complexity and uncertainty, air conditioning systems should provide the optimal thermal conditions in a building. These controller systems should be adaptable to changes in environmental parameters. In most air conditioning systems, today, there are On/Off controllers or PID in more advanced types, which, due to different environmental conditions, are not optimal and cannot provide the optimal environmental conditions. Controlling thermal comfort of an air conditioning system requires estimation of thermal comfort index. In this study, fuzzy controller was used to provide thermal comfort in an air conditioning system, and neural network was used to estimate thermal comfort in the feedback path of the controller. Fuzzy controller has a good response given the non-linear features of air conditioning systems. In addition, the neural network makes it possible to use thermal comfort feedback in a real-time control.
Volume: 19
Issue: 2
Page: 586-592
Publish at: 2020-08-01

Detection of the botnets’ low-rate DDoS attacks based on self-similarity

10.11591/ijece.v10i4.pp3651-3659
Sergii Lysenko , Kira Bobrovnikova , Serhii Matiukh , Ivan Hurman , Oleg Savenko
An article presents the approach for the botnets’ low-rate a DDoS-attacks detection based on the botnet’s behavior in the network. Detection process involves the analysis of the network traffic, generated by the botnets’ low-rate DDoS attack. Proposed technique is the part of botnets detection system – BotGRABBER system. The novelty of the paper is that the low-rate DDoS-attacks detection involves not only the network features, inherent to the botnets, but also network traffic self-similarity analysis, which is defined with the use of Hurst coefficient. Detection process consists of the knowledge formation based on the features that may indicate low-rate DDoS attack performed by a botnet; network monitoring, which analyzes information obtained from the network and making conclusion about possible DDoS attack in the network; and the appliance of the security scenario for the corporate area network’s infrastructure in the situation of low-rate attacks.
Volume: 10
Issue: 4
Page: 3651-3659
Publish at: 2020-08-01

Internet service providers responsibilities in botnet mitigation: a Nigerian perspective

10.11591/ijece.v10i4.pp4168-4175
Julius Olatunji Okesola , Marion Adebiyi , Tochukwu Osi-Okeke , Adeyinka Adewale , Ayodele Adebiyi
Botnet-based attack is dangerous and extremely difficult to overcome as all the primary mitigation methods are passive and limited in focus. A combine efforts of Internet Service Providers (ISPs) are better guides since they can monitor the traffic that traverse through their networks. However, ISPs are not legally banded to this role and may not view security as a primary concern. Towards understudying the involvement of ISPs in Botnet mitigation in Nigeria, this study elicited and summarized mitigation measures from scientific literatures to create a reference model which was validated by structured interview. Although, ISPs role is seen to be voluntary and poorly incentivized, the providers still take customers security very serious but concentrate more on preventive and notification measures.
Volume: 10
Issue: 4
Page: 4168-4175
Publish at: 2020-08-01

Novel switching technique for five leg inverter in dual motor control

10.11591/ijeecs.v19.i2.pp644-651
Jayaprakash Sabarad , G.H. Kulkarni
This work presents a novel switching technique for five leg inverter in dual motor control. As the technology advances in industry, requirements in reducing the cost plays an important role with reliable product design. In conventional method, the six legs are used in 2- three phase voltage source inverters (VSI) to control 2 motors. This proposed technique will give the improved performance of speed control for dual motor control using five leg inverter (FLI). New proposed method suggests to use 5-inverter legs instead of 6-inverter legs to control 2 induction motors. New Switching technique proposed in FLI system is designed in effective way that improved performance and Total Harmonic Distortion of ~23% achieved. The load sharing on common leg is called common mode (CM) of operation. In this new method, closed loop control designed by using space vector pulse width modulation (SVPWM) and direct torque control (DTC) in FLI Technology. With this new method smooth speed regulation is achieved when load torque is changed. THD% for CM-FLI is reduced when compared with convetional FLI technique. The new switching technique is controlled in effective way that the common leg is not overloaded and able to drive both the induction motors independently at required speeds. Proposed switching technique verified at different operating speeds with No load and rated torque. Simulation results computed using MATLAB/SIMULINK Software. 
Volume: 19
Issue: 2
Page: 644-651
Publish at: 2020-08-01

Analysis and design of a compact ultra-wideband antenna with WLAN and X-band satellite notch

10.11591/ijece.v10i4.pp4261-4269
Mohssine El Ouahabi , Aziz Dkiouak , Alia Zakriti , Mohamed Essaaidi , Hanae Elftouh
A compact design of ultra-wideband (UWB) antenna with dual band-notched characteristics based on split-ring resonators (SRR) are investigated in this paper. The wider impedance bandwidth (from 2.73 to 11.34 GHz) is obtained by using two symmetrical slits in the radiating patch and another slit in the partial ground plane. The dual band-notch rejection at WLAN and X-band downlink satellite communication system are obtained by inserting a modified U-strip on the radiating patch at 5.5 GHz and embedding a pair of rectangular SRRs on both sides of the microstrip feed line at 7.5 GHz, respectively. The proposed antenna is simulated and tested using CST MWS high frequency simulator and exhibits the advantages of compact size, simple design and each notched frequency band can be controlled independently by using the SRR geometrical parameters. Therefore, the parametric study is carried out to understand the mutual coupling between the dual band-notched elements. To validate simulation results of our design, a prototype is fabricated and good agreement is achieved between measurement and simulation. Furthermore, a radiation patterns, satisfactory gain, current distribution and VSWR result at the notched frequencies make the proposed antenna a suitable candidate for practical UWB applications.
Volume: 10
Issue: 4
Page: 4261-4269
Publish at: 2020-08-01

A two stage battery charger for EV charging applications

10.11591/ijeecs.v19.i2.pp593-599
V. Kalyanasundaram , George S Fernandez , K. Vijayakumar , S. Vidyasagar
Electric power generation and consumption are indicating an unprecedented change in recent decades. Electrical power industry and transportation sector lie at the core of this development and hence this change. This change is one of the major causes of polluting environmental and global warming. So, to decrease the dependency on conventional fuels and greenhouse gas emissions, countries around the globe are actively finding alternative energy resources. It will help to develop clean and green energies to build a sustainable society. Simultaneously, energy utilization in the field of transportation is witnessing a change from fossil fuel to electricity-based fuel. Electrified transportation system is a solution to endorse sustainable energy development and addressing environmental pollution, global warming issues. In this paper, an EV battery charger is designed with a two-stage charging model to achieve good efficiency. The design is simulated by using MATLAB simulation and compared with the existing model. The simulation results show that the proposed model is superior to the traditional model.
Volume: 19
Issue: 2
Page: 593-599
Publish at: 2020-08-01

Dynamic assessment effect on speaking performance of Indonesian EFL learners

10.11591/ijere.v9i3.20466
Fahmi Fahmi , Bambang Widi Pratolo , Nurul Amalia Zahruni
The research concerned the application of Dynamic Assessment (DA) in English Language Teaching (ELT) which based on Vygotsky’s theory, namely Zone of Proximal Development (ZPD). The research was meant to investigate the effect of DA in improving teaching and learning speaking in Indonesia especially English as a Foreign Language (EFL) learners in university. The research was conducted using a qualitative method by involving four Indonesian university learners in the first semester. The participants received the same treatments through pre-test and self-reflection, feedback and knowledge expansion, post-test and self-reflection, post-feedback, and semi-structured interviews. The instruments were used to analyze the learners’ non-fluency and mastery problem. The analysis showed that the learners’ speaking performance was improved after experiencing DA sessions. The results of the test and self-reflection showed significant improvement in their speaking. The finding showed some positive effects of DA on EFL learners’ speaking performance. In interviews, learners showed positive experiences and attitude toward DA since it served them a comfortable, structured, practical, and meaningful platform to recognize their speaking behavior, weaknesses, strength, and needs. Furthermore, it also helped them to get the objective feedbacks with less anxiety. The researchers conclude that DA can be applied as a primary alternative assessment in English speaking practices.
Volume: 9
Issue: 3
Page: 778-790
Publish at: 2020-08-01

Bacterial foraging optimization based adaptive neuro fuzzy inference system

10.11591/ijece.v10i4.pp3568-3575
C. Arul Murugan , G. Sureshkumaar , Nithiyananthan Kannan , Sunil Thomas
Life of human being and animals depend on the environment which is surrounded by plants. Like human beings, plants also suffer from lot of diseases. Plant gets affected by completely including leaf, stem, root, fruit and flower; this affects the normal growth of the plant. Manual identification and diagnosis of plant diseases is very difficult. This method is costly as well as time-consuming so it is inefficient to be highly specific. Plant pathology deals with the progress in developing classification of plant diseases and their identification. This work clarifies the identification of plant diseases using leaf images caused by bacteria, viruses and fungus. By this method it can be identified and control the diseases. To identify the plant leaf disease Adaptive Neuro Fuzzy Inference System (ANFIS) was proposed. The proposed method shows more refined results than the existing works.
Volume: 10
Issue: 4
Page: 3568-3575
Publish at: 2020-08-01

Analysis of direct power control AC-DC converter under unbalance voltage supply for steady-state and dynamic response

10.11591/ijece.v10i4.pp3333-3342
Nor Azizah Mohd Yusoff , Azziddin M. Razali , Kasrul Abdul Karim , Raja Nor Firdaus Kashfi Raja Othman , Auzani Jidin , Nor Aishah Md Zuki , Nurfaezah Abdullah
This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.
Volume: 10
Issue: 4
Page: 3333-3342
Publish at: 2020-08-01

Tactical approach to identify and quarantine spurious node participation request in sensory application

10.11591/ijece.v10i4.pp3451-3459
Somu Parande , Jayashree D. Mallapur
Securing Wireless Sensor Network (WSN) from variable forms of adversary is still an open end challenge. Review of diversified security apprroaches towards such problems that they are highly symptomatic with respect to resiliency strength against attack. Therefore, the proposed system highlights a novel and effective solution that is capable of identify the spurios request for participating in teh network building process from attacker and in return could deviate the route of attacker to some virtual nodes and links. A simple trust based mechanism is constructed for validating the legitimacy of such request generated from adversary node. The proposed system not only presents a security solution but also assists in enhancing the routing process significantly. The simulated outcome of the study shows that proposed system offers significantly good energy conservation, satisfactory data forwarding performance, reduced processing time in contrast to existing standard security practices.
Volume: 10
Issue: 4
Page: 3451-3459
Publish at: 2020-08-01

The students’ acceptance of learning management systems in Saudi Arabian Universities

10.11591/ijece.v10i4.pp4155-4161
Mutasem K. Alsmadi
For distance learners, continuous official education is very important for improving knowledge and learning experience in order to meet the career challenges in the modern world. This work studies the success factors which affect the use of LMS and evaluates the ability to apply the proposed model in the field of distance learning (DL) particularly in higher education. The survey was carried out on higher education learners who were included in the DL instructions. This work has utilized a questionnaire that was modified from literature to inspect three measurements, system design, system usage, and system outcome. Utilizing the obtained survey data for students of DL (N=149), the path analysis discovered that the design of the system has a significant effect on the satisfaction of users and intention for using LMS which affects the use of the system. Consequently, the satisfaction of users and the system used has a great impact on the net benefit.
Volume: 10
Issue: 4
Page: 4155-4161
Publish at: 2020-08-01
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