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29,939 Article Results

Adaptive robust control design to enhance smart grid power system stabilization using wind characteristics in Indonesia

10.11591/ijpeds.v12.i4.pp2182-2190
Khamda Herbandono , Cuk Supriyadi Ali Nandar
This paper is interested to study power system stability in smart grid power system using wind characteristic in south of Yogyakarta, Indonesia. To overcome the intermittent of wind characteristics, this paper presents adaptive robust control design to enhance power system stabilization. The online identification system is used in this research, which updated whenever the estimated model mismatch exceeds predetermined bounds. Then genetic algorithm (GA) is applied to re-tune parameters controller based on the estimated model. The structure of controller is proportional integral (PI) controller due to the most applicable in industry, simple structure, low cost and high reliability. Robustness of controller is guaranteed by taking system uncertainties into consideration. The performance of the proposed controller has been carried out in a hybrid wind-diesel power system in comparison with previous work controller. Simulation results confirm that damping effect of the proposed controllers are much better that of the conventional controllers against various operating.
Volume: 12
Issue: 4
Page: 2182-2190
Publish at: 2021-12-01

An adaptive multi-hop routing with IoT abstraction for minimizing delay-node capacity trade-offs in mobile ad-hoc network

10.11591/ijece.v11i6.pp5315-5326
Haitham Shiaibth Chasib , Saddam Raheem Salih , Israa Jaber Khalaf Al-Ogaili
Delay and node capacity are incompatible mobile ad hoc constraints because of the network's versatility and self-disciplined design. It is a challenging problem to maximize the trade-off between the above mobility correlation factors. This manuscript proposes an adaptive multi-hop routing (A.M.R.) for mobile ad-hoc network (MANET) to minimize the trade-off by integrating the internet of things (IoT). IoT nodes' smart computing and offloading abilities are extended to ad-hoc nodes to improve routing and transmission. Dor MANET nodes in route exploration, neighbor selection, and data transmission, the beneficial features of IoT include enhanced decision making. The traditional routing protocols use IoT at the time of the neighbor discovery process in updating the routing table and localization. The harmonizing technologies with their extended support improve the performance of MANETs has been estimated. The proposed method achieves better throughput (14.16 Mbps), delay (0.118), packet drop (126), and overhead (36 packets) when compared to existing methods.
Volume: 11
Issue: 6
Page: 5315-5326
Publish at: 2021-12-01

An approach to partial occlusion using deep metric learning

10.11591/ijict.v10i3.pp204-211
Chethana Hadya Thammaiah , Trisiladevi Chandrakant Nagavi
The human face can be used as an identification and authentication tool in biometric systems. Face recognition in forensics is a challenging task due to the presence of partial occlusion features like wearing a hat, sunglasses, scarf, and beard. In forensics, criminal identification having partial occlusion features is the most difficult task to perform. In this paper, a combination of the histogram of gradients (HOG) with Euclidean distance is proposed. Deep metric learning is the process of measuring the similarity between the samples using optimal distance metrics for learning tasks. In the proposed system, a deep metric learning technique like HOG is used to generate a 128d real feature vector. Euclidean distance is then applied between the feature vectors and a tolerance threshold is set to decide whether it is a match or mismatch. Experiments are carried out on disguised faces in the wild (DFW) dataset collected from IIIT Delhi which consists of 1000 subjects in which 600 subjects were used for testing and the remaining 400 subjects were used for training purposes. The proposed system provides a recognition accuracy of 89.8% and it outperforms compared with other existing methods.
Volume: 10
Issue: 3
Page: 204-211
Publish at: 2021-12-01

Speed control in DC and AC drives

10.11591/ijpeds.v12.i4.pp2006-2017
Reinel Beltran Aguedo , Ania Lussón Cervantes , José Ricardo Núñez Alvarez , Yolanda Llosas Albuerne
Three speed-control strategies for DC and AC drives are presented in this study: a proportional integral derivative (PID) control strategy; an internal model control (IMC); and a state-space control by pole assignment with full state observer (ESSO). The three strategies are applied to a case study, demonstrating the potential of each one. Experimental identification was used to obtain the drive models used for the synthesis of the controllers. The three strategies showed satisfactory results when compared with the requirements imposed on the system, in addition to the good rejection of disturbances. However, the IMC strategy showed itself to be a little softer and with no maximum overshoot, which in some cases and some applications is usually a restriction.
Volume: 12
Issue: 4
Page: 2006-2017
Publish at: 2021-12-01

Using the modified k-mean algorithm with an improved teaching-learning-based optimization algorithm for feedforward neural network training

10.11591/ijece.v11i6.pp5277-5285
Morteza Jouyban , Mahdieh Khorashadizade
In this paper we proposed a novel procedure for training a feedforward neural network. The accuracy of artificial neural network outputs after determining the proper structure for each problem depends on choosing the appropriate method for determining the best weights, which is the appropriate training algorithm. If the training algorithm starts from a good starting point, it is several steps closer to achieving global optimization. In this paper, we present an optimization strategy for selecting the initial population and determining the optimal weights with the aim of minimizing neural network error. Teaching-learning-based optimization (TLBO) is a less parametric algorithm rather than other evolutionary algorithms, so it is easier to implement. We have improved this algorithm to increase efficiency and balance between global and local search. The improved teaching-learning-based optimization (ITLBO) algorithm has added the concept of neighborhood to the basic algorithm, which improves the ability of global search. Using an initial population that includes the best cluster centers after clustering with the modified k-mean algorithm also helps the algorithm to achieve global optimum. The results are promising, close to optimal, and better than other approach which we compared our proposed algorithm with them.
Volume: 11
Issue: 6
Page: 5277-5285
Publish at: 2021-12-01

Design and simulation of video monitoring structure over TCP/IP system using MATLAB

10.11591/ijeecs.v24.i3.pp1840-1845
Amany Mohammad Abood , Maysam Sameer Hussein , Zainab G. Faisal , Zainab H. Tawfiq
Video monitoring systems are undergoing an evolution from conventional analog to digital clarification to provide better rate and security over internet protocols. In addition, analog surveillance becomes insufficient to face enormous demand of security of system contains more than hundreds of camera often deployed in hotels environments far away from room control. This paper presents the design and simulation of a video monitoring scheme in excess of a transmission control protocol/internet protocol (TCP/IP) system using MATLAB. Sophisticated cameras could record directly high-definition digital videos based on digital technology which simply communicate the control room relaying on ordinary internet protocol infrastructure networks. This technology provides a flexible network interface over a wide variety of heterogeneous technology networks. Though, the acceptance of IP designed for video monitoring pretense severe difficulties in terms of power processing, system dependability, required bandwidth, and security of networks. The advantage of IP based video monitoring system has been investigated over conventional analog systems and the challenges of the method are described. The open research issues are still requiring a final solution to permits complete abandon against conventional technology of analog methods. In conclusion, the method to tackle the purpose of video monitoring in actual operation is proposed and verified properly by means of model simulation.
Volume: 24
Issue: 3
Page: 1840-1845
Publish at: 2021-12-01

Indoor air quality in urban residential: Current status, regulation and future research for Indonesia

10.11591/ijphs.v10i4.20885
Ezra Ganesha Prihardanu , Haryoto Kusnoputranto , Herdis Herdiansyah
Modern society spends more time indoors, which has led to the hypothesis that indoor exposure can better represent the effects of air pollution at the individual level. Studies on the landscape of urban residential indoor air quality have never been carried out nationally in Indonesia. After 70 years of commitment to standardize the health aspects of the home in Indonesia, this study intends to make a chronological reflection on the Indonesian government's policy in residential indoor air quality. This study raised and analyzed several questions in the national and local context from the previous research. The government's various policies and regulations are chronologically listed to see the development and look for regulatory or implementation gaps. The indicators of insufficient ventilation and indoor air quality in much Indonesian urban housing have been shown in previous studies, encouraging this study to be necessary. This study used a chronological review using national and international journals. Previous studies have shown possibilities to estimate the landscape of indoor pollution exposure effectively using a socio-economic approach as a part. The latest national housing survey results can be used as references to discover the housing landscape status in Indonesia for further research suggestions.
Volume: 10
Issue: 4
Page: 824-833
Publish at: 2021-12-01

A small vessel detection using a co-located multi-frequency FMCW MIMO radar

10.11591/ijece.v11i6.pp5144-5152
Suraya Zainuddin , Nur Emileen Abd Rashid , Idnin Pasya , Raja Syamsul Azmir Raja Abdullah , Korhan Cengiz
Small vessels detection is a known issue due to its low radar cross section (RCS). An existing shore-based vessel tracking radar is for long-distance commercial vessels detection. Meanwhile, a vessel-mounted radar system known for its reliability has a limitation due to its single radar coverage. The paper presented a co-located frequency modulated continuous waveform (FMCW) maritime radar for small vessel detection utilising a multiple-input multiple-output (MIMO) configuration. The radar behaviour is numerically simulated for detecting a Swerling 1 target which resembles small maritime’s vessels. The simulated MIMO configuration comprised two transmitting and receiving nodes. The proposal is to utilize a multi-frequency FMCW MIMO configuration in a maritime environment by applying the spectrum averaging (SA) to fuse MIMO received signals for range and velocity estimation. The analysis was summarised and displayed in terms of estimation error performance, probability of error and average error. The simulation outcomes an improvement of 2.2 dB for a static target, and 0.1 dB for a moving target, in resulting the 20% probability of range error with the MIMO setup. A moving vessel's effect was observed to degrade the range error estimation performance between 0.6 to 2.7 dB. Meanwhile, the proposed method was proven to improve the 20% probability of velocity error by 1.75 dB. The impact of multi-frequency MIMO was also observed to produce better average error performance.
Volume: 11
Issue: 6
Page: 5144-5152
Publish at: 2021-12-01

Modified multistep model predictive control for three-phase induction motor drive system considering the common-mode voltage minimization

10.11591/ijpeds.v12.i4.pp2251-2260
Bao Binh Pho , Nguyen Van Cao , Tran Minh Hoan , Phuong Vu
It is acknowledged that the common-mode voltage may have detrimental effects on an induction motor (IM) drive system if not properly addressed. Therefore, in this paper, a modified multistep model predictive control method for IM drive system considering the common-mode voltage minimization is proposed. This research uses a multi-objective cost function, before applying the Sphere Decoding Algorithm to find the optimal control input. The results show that the proposed control method not only reduces the common-mode voltage significantly but also mitigates the computational burden of the microprocessor without affecting the system performance. The proposed control method is simulated by MATLAB-Simulink for an IM drive system with an 11-level cascaded H-bridge inverter.
Volume: 12
Issue: 4
Page: 2251-2260
Publish at: 2021-12-01

Factors of academic stress: Do they impact English academic performance?

10.11591/ijere.v10i4.21296
Erlinda D. Tibus , Sybill Krizzia G. Ledesma
This study investigated the college students’ level of academic performance and determined the impact of academic stress on their English academic performance. This employed a descriptive-exploratory research design with Exploratory Factor Analysis (EFA) and correlation analysis (Pearson r) as main analyses using statistical software. The result suggested that the students (N=250) have a moderate level of stress. Likewise, seven factors were generated through EFA but were reduced to four factors using parallel analysis, the factors are perceived personal stress, classroom stress, performance stress, and time management stress. In the correlation analysis, it was found out that perceived personal stress, classroom stress, and performance stress are significantly correlated except for time management stress. Moreover, these factors were found to have no significant relationship with the English grades of the students. With this result, it is concluded that despite having a moderate level of academic stress, students were able to manage them by using a plethora of coping mechanisms available. The institutions should offer prevention and intervention services that directly address the academic stress of the students to ensure academic success.
Volume: 10
Issue: 4
Page: 1446-1454
Publish at: 2021-12-01

Rethinking territoriality concept on public space after pandemic COVID-19

10.11591/ijphs.v10i4.20825
Sherly de Yong , Murni Rachmawati , Ima Defiana
The spread and pandemic of coronavirus disease (COVID-19) that is currently happening in the world, has led to new policy steps in the security of public spaces to reduce the transmission of COVID-19 and protect public health. There is new adaptation in the policies while using space like limiting the use of public spaces, increasing social distancing between people or creating territory. Territory means specific area where are claimed or maintained (can be physically, through ruler or symbols). Territory can give a sense of security to the users. Therefore, this paper give insight and rethinking the territory concept as sense of security in interior public space and built environment where people expect to see strangers in this space. The methods in this paper are literature review method by collecting and synthesizing previous research using integrative approach. For the result is territory concept achieved as part of protection to the users in the build environment with mechanisms that should be applied in each type: the boundary between areas; limitation to the symbolic; supervision and control of space.
Volume: 10
Issue: 4
Page: 856-864
Publish at: 2021-12-01

Modeling of hybrid active power filter using artificial intelligence controller: hardware and software prospective

10.11591/ijpeds.v12.i4.pp2545-2556
Sandhya P. , Nagaraj R.
The power factor is a significant concern in power systems. The significant power loss occurred due to electronic and electrical equipment damages affected by the deviation of physical characteristics, including voltage, current, and frequency parameters.The power loss and quality issues were resolved by introducing filtering techniques in electronic and electrical equipment. Many filtering techniques include passive filtering (PF), Active power filter (APF), and many hybrid approaches are already available. Most of these methods use proper compensation controlling approaches and failed to minimize the total harmonic distortion (THD), and harmonic mitigation in power systems has its best. In this article, an efficient Hybrid-APF using Artificial-Neuro Fuzzy interface system (ANFIS) for software and hardware perspective is designed. The proposed approach uses hybrid controlling strategies which include PI with artificial intelligence (ANFIS) controller, to control the power losses for H-APF. Additionally, current compensation is achieved by PQ-theory, followed by Hysteresis-Current- Controller (HCC). The hardware architecture of ANFIS with HCC is designed to improve the chip-area for real-time power applications.The present work analyzed by simulating the voltage and current waveform. The proposed-H-APF using ANFIS controller, both software and hardware approaches, is compared with other control techniques like H-APF with PI and Fuzzy logic controller by concerning THD,Reactive power, and Different Harmonics and loads improvements.
Volume: 12
Issue: 4
Page: 2545-2556
Publish at: 2021-12-01

Comparative techno-economic analysis of power system with and without renewable energy sources

10.11591/ijeecs.v24.i3.pp1260-1268
Hephzibah Jose Queen , Jayakumar J. , Deepika T. J.
The primary aim of this work is to feature the advantages of integrating natural source of energy from the solar and wind to the prevailing electric power systems. Two types of analysis are carried out in two test systems (standard and modified test systems) and the outcome of the test systems are compared. The two analyses are technical analysis and economic analysis. The stability of the voltage is analyzed under technical analysis and the price of energy consumed from the electric grid is calculated and analyzed under the economic analysis. Dynamic hourly load data, hourly solar radiation, hourly wind velocity, and dynamic electricity prices are considered for the standard IEEE system and modified test system (with the integration of RES). Voltage stability index (L-Index) and price of the electricity consumed from electric grid are found for standard test system and the outcome is compared with the outcome of modified test systems. MATLAB coding is done for techno-economic analysis for both test systems. It is inferred from the outcome that the integration of renewable energy sources fairly contributes to the economic benefit of the system by lowering the power purchased from the grid and enhance the stability of the system.
Volume: 24
Issue: 3
Page: 1260-1268
Publish at: 2021-12-01

Medical crisis during pandemic: Career preferences change in medical student

10.11591/ijere.v10i4.21897
Dian Natalia , Rizma Adlia Syakurah
The COVID-19 pandemic is a major threat to global education. Incidental emotions of fear and anxiety during pandemic have unconsciously influenced preference and outcome about their future career. This study aimed to assess the effect of the COVID-19 pandemic towards career preference change in medical students. A total of 1,027 responses from all over the medical students in Indonesia were collected from an online questionnaire which was broadcasted through social media from 14th July 2020–21st July 2020. This study was using Fear of COVID-19 Scale (FCV-19S) and Depression Anxiety Stress-Scale-21 (DASS-21) to assess fear of COVID-19, stress, anxiety, and depression. Out of 1,027 respondents, 44.6% had stressed, 47.8% had anxiety, and 18.5% had depression with an average FCV-19S score was 17.1. The result showed that the fear and anxiety of COVID-19 during the pandemic had associated significantly with the career decisions in medical students (p=<0.05). Indonesian policymakers had to keep in mind that the fear of the COVID-19 pandemic in medical students is due to the high mortality COVID-19 cases of health workers in Indonesia. Health workers need adequate working conditions and specific protection, this requires prompt attention from stakeholders.
Volume: 10
Issue: 4
Page: 1255-1261
Publish at: 2021-12-01

Least mean sixth control approach for three-phase three-wire grid-integrated PV system

10.11591/ijpeds.v12.i4.pp2131-2139
Touheed Khan , Mohammed Asim , Mohammad Saood Manzar , Md Ibrahim , Shaikh Sadaf Afzal Ahmed
This work proposes an adaptive filter based on a new least mean sixth control approach with incremental conductance method of MPP for 3-phase grid-incorporated photovoltaic (PV) system. The proposed system comprises a PV array, 3-phase DC to AC converter, maximum power point tracker (MPPT), three-phase electronic load, and a 3-phase grid. The combination of solar PV array and the voltage source converter (VSC) supplies power to the grid. The 3-phase inverter as a distribution static synchronous compensator (D-STATCOM) improves the quality of the system performance in case of zero solar irradiation. D-STATCOM also reduces total harmonic distortion (THD) in grid currents, improves power factor, and maintainsa constant voltage at the point of common coupling (PCC). The system modelling and simulation is achieved on MATLAB/Simulink. The proposed system performance has been found satisfactory and conform to IEEE-519 standards.
Volume: 12
Issue: 4
Page: 2131-2139
Publish at: 2021-12-01
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