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29,939 Article Results

Active tremor control in human-like hand tremor using fuzzy logic

10.11591/ijeecs.v24.i1.pp108-115
Hafiz Bin Jamaludin , Azizan As'arry , R. Musab , Khairil Anas Md Rezali , Raja Mohd Kamil Bin Raja Ahmad , Mohd Zarhamdy Bin Md. Zain
Tremoris the vibration in sinusoidal orientation that is experienced regularly by a person with Parkinson’s disease (PD), which disturbs their daily activities. One solution that may be used to counter this tremor effect is by developing an active tremor control system in LabVIEW for linear voice coil actuator (LVCA), where the system uses proportional (P) controller and various types of fuzzy logic controller (FLC) as a hybrid controller to reduce tremor vibration. From this research, it can be concluded that the best controller for tremor reduction is the P+FLC 1st set of rules, compared to P+FLC 2nd set of rules, and P controller only, with the highest percentage of 88.39% of tremor reduction with the actual tremor vibration of PD patients as the reference result. The P+FLC 2nd set of rules has the highest percentage of tremor reduction with a value of 86.81%, whereas P controller only has the highest tremor reduction percentage of 67.10%. This percentage of tremor reduction is based on the power spectral density (PSD) values, in which it represents the intensity of the tremor vibration. This experimental study can be used as an initial step for researchers and engineers to design and develop an anti-tremor device in the future.
Volume: 24
Issue: 1
Page: 108-115
Publish at: 2021-10-01

Blockchain based voting system for Jordan parliament elections

10.11591/ijece.v11i5.pp4325-4335
Mohammad Malkawi , Muneer Bani Yassein , Asmaa Bataineh
Covid-19 pandemic has stressed more than any-time before the necessity for conducting election processes in an electronic manner, where voters can cast their votes remotely with complete security, privacy, and trust. The different voting schema in different countries makes it very difficult to utilize a one fits all system. This paper presents a blockchain based voting system (BBVS) applied to the Parliamentary elections system in the country of Jordan. The proposed system is a private and centralized blockchain implemented in a simulated environment. The proposed BBVS system implements a hierarchical voting process, where a voter casts votes at two levels, one for a group, and the second for distinct members within the group. This paper provides a novel blockchain based e-Voting system, which proves to be transparent and yet secure. This paper utilizes synthetic voter benchmarks to measure the performance, accuracy and integrity of the election process. This research introduced and implemented new algorithms and methods to maintain acceptable performance both at the time of creating the blockchain(s) for voters and candidates as well as at the time of casting votes by voters.
Volume: 11
Issue: 5
Page: 4325-4335
Publish at: 2021-10-01

Combined fuzzy PID regulator for frequency regulation of smart grid and conventional power systems

10.11591/ijeecs.v24.i1.pp12-21
Smrutiranjan Nayak , Sanjeeb Kumar Kar , Subhransu Sekhar Dash
In continually increasing area and structure of modern power system having burden demand uncertainties, the use of knowledgeable and vigorous frequency power strategy is essential for the satisfactory functioning of the Power system. A combined fuzzy proportional-integral-derivative (CFPID) controller is suggested for frequency supervision of the power system. To optimize the controller parameters, a review of sine and cosine work adjusted improved whale optimization algorithm (SCiWOA) has been utilized. The next practical application of power-system frequency control is performed by designing a CFPID controller using the proposed SCiWOA technique for a smart grid system having inexhaustible sources like sun oriented, wind, photovoltaic and capacity gadgets like a battery, flywheel just as module electric vehicles. The first advantages of the SCiWOA tuned CFPID controller over hybrid-particle-swarm-optimization and pattern-search (hPSO-PS) adjusted fuzzy proportional-integral (FPI) controller, hybrid bacterial foraging optimization algorithm-particle swarm optimization (hBFOA-PSO) adjusted proportional-integral (PI) controller, genetic algorithm (GA) tuned proportional and integral (PI) controller, BFOA adjusted PI controller, jaya algoritm (JA) tuned PID with derivative filter (PIDN) controller and teaching learning based optimization (TLBO) tuned proportional-integral-derivative (PID) controller are demonstrated for the two-area non-reheat thermal power system. The second advantages of the SCiWOA tuned CFPID controller over artificial-bee-colony (ABC) tuned PID controller, SOSA tuned PID controller and Firefly algorithm (FA) tuned PID controller are demonstrated for two-area reheat thermal power system. It is seen that SCiWOA based CFPID controller is more effective in controlling the recurrence comparative with PID regulator.
Volume: 24
Issue: 1
Page: 12-21
Publish at: 2021-10-01

Identification of user’s credibility on twitter social networks

10.11591/ijeecs.v24.i1.pp554-563
Faraz Ahmad , S. A. M. Rizvi
Twitter is one of the most influential social media platforms, facilitates the spreading of information in the form of text, images, and videos. However, the credibility of posted content is still trailed by an interrogation mark. Introduction: In this paper, a model has been developed for finding the user’s credibility based on the tweets which they had posted on Twitter social networks. The model consists of machine learning algorithms that assist not only in categorizing the tweets into credibility classes but also helps in finding user’s credibility ratings on the social media platform. Methods and results: The dataset and associated features of 100,000 tweets were extracted and pre-processed. Furthermore, the credibility class labelling of tweets was performed using four different human annotators. The meaning cloud and natural language understanding platforms were used for calculating the polarity, sentiment, and emotions score. The K-Means algorithm was applied for finding the clusters of tweets based on features set, whereas, random forest, support vector machine, naïve Bayes, K-nearest-neighbours (KNN), J48 decision tree, and multilayer perceptron were used for classifying the tweets into credibility classes. A significant level of accuracy, precision, and recall was provided by all the classifiers for all the given credibility classes.
Volume: 24
Issue: 1
Page: 554-563
Publish at: 2021-10-01

Efficiency improvement of dual three-phase permanent magnet synchronous motor using modified switching table DTC for electric ship propulsion

10.11591/ijpeds.v12.i3.pp1315-1325
Aziz El Afia , Mhammed Hasoun , Mohamed Khafallah , Karim Benkirane
A direct torque control using a classical switching- table ST-DTC can be used to control the torque and thus the speed of Dual Three-Phase Permanent Magnet Synchronous Motor (DTP-PMSM). The principle is based on direct application of control sequence by using two hysteresis regulators and a switching table. A large stator current containing low order harmonics is produced during the application of the classic ST-DTC technique, this leads to higher losses affecting the efficiency of the machine. To allow a reduction of these harmonics a modified switching-table approach based DTC technique is examined. Indeed, an improved ST-DTC strategy, which consist of replacing the vectors of the classical table with synthetic vectors, is discussed. The simulation results confirm the validity of the selected strategy.
Volume: 12
Issue: 3
Page: 1315-1325
Publish at: 2021-09-01

Magnesium deficiency associated with diabetic retinopathy in type 2 diabetes mellitus: A meta-analysis

10.11591/ijphs.v10i3.20916
Ronald Pratama Adiwinoto , Robert Dwitama Adiwinoto , Jongky Hendro Prajitno
Diabetic retinopathy (DR) is the major cause of visual impairment in the working-age population with type 2 diabetes mellitus (T2DM). Magnesium (Mg) is involved in various metabolic processes and in experimental animal studies; Mg has shown essential roles in physiological eye function. Magnesium deficiency is common in T2DM; therefore we analyzed the association between serum Mg status and the presence of DR in T2DM patients. Systematic literature searching in several databases, from 1988 to September 2020, was performed using search terms: “serum magnesium” or “hypomagnesemia” and “diabetic retinopathy” or “retinopathy”. A total of 3,227 patients from 17 studies were included in this meta-analysis. Hypomagnesemia was associated with increased risk of developing DR (OR 4.52 [2.08, 9.81], p=0.0001) in T2DM patients. Serum Mg levels also lower in patients with DR than those without DR (MD –0.30 mg/dL [–0.44, –0.15], p<0.0001). Additionally, serum Mg levels were lower in patients with proliferative DR (PDR) than those with non-proliferative DR (NPDR) (MD-0.21 mg/dL [–0.34, –0.09], p=0.0009). Leave-one-out sensitivity analysis did not change the overall effect. Hypomagnesemia or low serum Mg levels in T2DM patients increased the risk of developing DR.
Volume: 10
Issue: 3
Page: 565-573
Publish at: 2021-09-01

Two-level inverter and three-level neutral point diode clamped inverter for traction applications: a comparative analysis study

10.11591/ijpeds.v12.i3.pp1609-1619
Asmaa A. Abdelsalam , Mohamed Adel Esmaeel , Salama Abo Zaid
This paper presents an analytical comparison between two-level inverter and three-level neutral point diode clamped inverters for electric vehicle traction purposes. The main objective of the research is to declare the main differences in the performance of the two inverter schemes in terms of the switching and conduction losses over an entire domain of the modulation index and the phase angle distribution, steady-state operation, transient operation at a wide range of speed variation, and the total harmonic distortion THD% of the line voltage output waveform. It also declares the analysis of the three-level neutral point diode clamped inverter (NPCI) obstacle and the unbalance of the DC-link capacitor voltages. The introduced scheme presents an Induction Motor (IM) drive for electric vehicle (EV) applications. Considering the dynamic operation of the EV, the speed of the three-phase induction motor is controlled using a scalar V/Hz control for the full range of the IM power factor (PF). A comprehensive MATLAB/Simulink model for the proposed scheme is established.
Volume: 12
Issue: 3
Page: 1609-1619
Publish at: 2021-09-01

Analyzing the BER and optical fiber length performances in OFDM RoF links

10.11591/ijeecs.v23.i3.pp1501-1509
Marwa M. Kareem , Sameer A. S. Lafta , Hadi Fakhir Hashim , Raed Khalid Al-Azzawi , Adnan Hussein Ali
Radio over fiber (RoF) can be assessed as a system of most convenient combination of optical fiber and radio signals. The technique of orthogonal frequency division multiplexing (OFDM) considers as a data distribution over a huge number of carriers having spaced from each other with specific frequencies at overlap bands. Hence incorporates OFDM with the optical fiber, OFDM-RoF system can be increased the modulation RF access capacity besides high-speed data transmission, it considers a broadband communication trend of the current and future applications specifically for 5G mobile. The optical network scenarios of various RF can be model with optisystem software, and OFDM in addition to use a section of the orthogonal multiplex frequency of 16-quadrature amplitude modulation (QAM) RF modulating signal. In the optical domain, Mach-Zehnder modulator (MZM) optical modulators are used to carry out different results with different fiber lengths. An OFDM-RoF wireless communication system considers as advanced data rate transmission achievement by minimum delays. The essential goal of this paper is for identifying the minimum bit error rate (BER) for the 16-QAM modulation with varying fiber length. The OFDM-RoF system can be able for realizing a fiber length 100 km with a restricted decreasing in the received power so that the constellation noise is became greater despite of applying electrical amplification and optical amplification.
Volume: 23
Issue: 3
Page: 1501-1509
Publish at: 2021-09-01

Food consumption habits of consumers in the Philippines: Changes amidst the pandemic

10.11591/ijphs.v10i3.20823
Jonathan Necor Tariga , Dyanika Paray Nolasco , Syrille Joyce Raspado Barayuga
A quantitative descriptive strategy was applied to identify food patterns for Filipino consumers before, during and after the COVID-19 pandemic. Sampling was carried out using simple random sampling techniques. An electronic-questionnaire served as primary research instrument and was distributed through social media platforms to which 80 out of 250 responses were selected. Simple quantitative analysis such as mean value, frequency distribution and percentage were utilized. Results showed that the most of the respondent’s diet has wellness, social and psychological influence. Organic diet desires and self-cooking practices are continuing to grow. The study also showed that the essential aspects of food choice, health, quality and safety are increasingly being taken into account. The COVID-19 pandemic shifted the habits of food intake to healthier, influencing even the preference of consumed food. Thus, this study can be used as a theoretical guide especially for factors influencing the eating patterns during a pandemic. Ergo, food establishments can make use of the results to strategize to combat the COVID-19 pandemic by improving product quality on the basis of consumer needs and demands.
Volume: 10
Issue: 3
Page: 662-669
Publish at: 2021-09-01

The MPPT algorithm combined with pitch angle control for the small-scale wind turbine in a wide speed range

10.11591/ijpeds.v12.i3.pp1482-1493
Quang-Vi Ngo , Trong-Thang Nguyen
This research proposes the control system structure for a small-scale wind turbine. Significantly, the maximum power point tracking algorithm (MPPT) and the pitch angle controller are deeply analyzed; this is the base for proposing the strategy of the MPPT algorithm combined with pitch-angle control in a wide speed range of wind. This article also researches the converters, then analyses the advantages of each converter to choose the suitable converter for the small-scale wind turbine. In the MPPT algorithm design, the expert experience takes advantage through the fuzzy controller. The pitch angle controller is built based on the PID controller with its parameters adjusted by Fuzzy logic. The results showed that the effectiveness of the proposed control strategy is much better than that of the traditional control strategy. Moreover, in high and low wind speeds, the proposed control system operates reliably and stably.
Volume: 12
Issue: 3
Page: 1482-1493
Publish at: 2021-09-01

EFL university teachers’ perspectives in written corrective feedback and their actual applications

10.11591/ijere.v10i3.21641
Windy Wahju Purnomo , Yazid Basthomi , Johannes Ananto Prayogo
This study aimed to investigate the English as a foreign language (EFL) university teachers’ perspective and their actual applications in providing written corrective feedback to the writing errors made by the EFL university students and their correlation. The study was based on 80 responses of a Google-Form survey distributed to EFL university teachers with various teaching experiences from the most parts of Indonesia. Correlational design was used in this research. Descriptive statistics and Pearson’s correlation tests were used to analyze data. The results indicated that the majority of teachers had perspectives that it is valuable to provide and vary the strategies of written corrective feedback. In addition, the teachers mostly applied both direct and indirect feedback in various strategies and they only sometimes provided corrections in all aspects of errors and reformulation. It was also found out that the Indonesian EFL university teachers’ perspectives in the written corrective on students’ writing errors highly correlated with their actual applications. The results of the study provide both theoretical and pedagogical implications. Theoretically, it enriches the body knowledge of feedback and EFL writing. Pedagogically, EFL teachers are also suggested to improve their knowledge on various feedback techniques and apply it in their classroom teaching and learning process. 
Volume: 10
Issue: 3
Page: 1089-1099
Publish at: 2021-09-01

Advanced control strategy of DFIG during symmetrical grid fault

10.11591/ijpeds.v12.i3.pp1422-1430
Tariq Riouch , Cristian Nichita
This article proposes a novel scheme to improve the doubly-fed induction generator (DFIG) behavior during grid fault. The DFIG’s are sensitives to voltage variations when abrupt variations of the wind velocity arrive. For enhancing DFIG behavior, protecting the converters, and smoothing the fluctuations power output of the DFIG under sag voltage; a novel hybrid energy storage system scheme and its controller are proposed. The main advantages of our approach are a faster response and suppressing overvoltage on DC bus and globally less stress in the storage system. The control structure decreases the tiredness on the battery and restores the DC bus voltage rapidly, globally the battery system operating time increases. The results obtained by simulations in MATLAB validate the benefits of the suggested control.
Volume: 12
Issue: 3
Page: 1422-1430
Publish at: 2021-09-01

A practical method to design the solar photovoltaic system applied on residential building in Indonesia

10.11591/ijeecs.v23.i3.pp1736-1747
Prisma Megantoro , Pinto Anugrah , Yusrizal Afif , Lilik Jamilatul Awalin , P. Vigneshwaran
The use of solar PV system in Indonesia has expanded to various field and area. One example is residential buildings in urban areas. This article discusses calculation methods for designing a solar power generation system that is applied to residential buildings, such as homes, offices, or colleges. Electricity generated from the solar home system (SHS) is used to support many kinds of electrical equipments, where the electrical equipments are used by building occupants in their daily life. The calculation method is considered from the potential of solar energy and the reliability of the on-site system to generate electricity. The system is designed in an off-grid topology by exchanging connections with the public electricity grid owned by PLN. Calculation results shows that this SHS has a generation capacity of 1 kWp, 24 V 300 Ah battery storage, and a 200 W inverter. This SHS can reduce electricity usage in this sector by 18.2 kWh in average every month.
Volume: 23
Issue: 3
Page: 1736-1747
Publish at: 2021-09-01

New bidirectional step-up DC-DC converter derived from buck- boost DC-DC converter

10.11591/ijpeds.v12.i3.pp1699-1707
Ridha D. N. Aditama , Naqita Ramadhani , Jihad Furqani , Arwindra Rizqiawan , Pekik Argo Dahono
This paper proposes a new bidirectional step-up DC-DC converter, namely modified buck-boost DC-DC converter. The proposed DC-DC converter was derived from the conventional buck-boost DC-DC converter. Output voltage expression of the proposed converter was derived by considering the voltage drops across inductors and switching devices. The results have shown that with the same parameter of input LC filter, proposed DC-DC converter has lower conduction losses. Moreover, the proposed DC-DC converter has lower rated voltage of filter capacitor than the conventional boost DC-DC converter which lead to cost efficiency. Finally, a scaled-down prototype of laboratory experiment was used to verify its theoretical analysis.
Volume: 12
Issue: 3
Page: 1699-1707
Publish at: 2021-09-01

Hybrid nonlinear control strategies for performance enhancement of a doubly-fed induction aero-generator: design and DSP implementation

10.11591/ijpeds.v12.i3.pp1472-1481
Bouchaib Rached , Mustapha Elharoussi , Elhassane Abdelmounim
This paper reports on the design and implementation in DSP as hardware in the loop of a nonlinear control strategy for a grid-connected variable speed wind turbine using a doubly fed induction generator (DFIG). The objective of this work is to build a real-time nonlinear hybrid approach combining Backstepping control and sliding mode control strategies for DFIG used in wind energy conversion systems (WECS). The results of the DSP implementation are discussed and qualitative and quantitative performance evaluations are performed under various disturbed conditions. The implementation is performed using the TMS320F28335 DSP combined with the MATLAB/Simulink (2016a) environment. The experimental results have been satisfactorily achieved, which implies that the proposed strategy is an efficient and robust approach to monitor the WECS.
Volume: 12
Issue: 3
Page: 1472-1481
Publish at: 2021-09-01
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