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29,922 Article Results

Investigating sine-band hysteresis control of photovoltaic-grid connected inverter

10.11591/ijpeds.v11.i2.pp969-976
M. Della Krachai , K. Melouk , M. Keddar
In this paper, an optimization of PV grid connected system is investigated. This is achieved by considering the application of artificial intelligence in the DC side to realize maximal power extraction, and using a sine-band hysteresis control in the AC side of the system, to generate a sine current/voltage suitable for grid connection IEEE929-2000 standards. The overall system has been simulated taking into account environmental effects and standards constraints in order to achieve best performance. The choice of sine band hysteresis control was selected considering its implementation simplicity. The algorithm runs fast on a low-cost microcontroller allowing to avoid any delay that can cause a phase shift in the system.  An experimental setup has been realized for tests and validation purposes. Both simulation and experimental results lead to satisfactory results which are conform to the IEEE929-2000 standards.
Volume: 11
Issue: 2
Page: 969-976
Publish at: 2020-06-01

Nutrient deficiency detection in Maize (Zea mays L.) leaves using image processing

10.11591/ijai.v9.i2.pp304-309
Nurbaity Sabri , Nurul Shafekah Kassim , Shafaf Ibrahim , Rosniza Roslan , Nur Nabilah Abu Mangshor , Zaidah Ibrahim
Maize is one of the world's leading food supplies. Therefore, the crop's production must continue to reproduce to fulfill the market demand. Maize is an active feeder, therefore, it need to be adequately supplied with nutrients. The healthy plants will be in deep green color to indicate it consist of adequate nutrient. Current practice to identify the nutrient deficiency on maize leaf is throught a laboratory test. It is time consuming and required agriculture knowledge. Therefore, an image processing approach has been done to improve the laboratory test and eliminate a human error in identification process. The purpose of this research is to help agriculturist, farmers and researchers to identify the type of maize nutrient deficiency to determine an action to be taken. This research using image processing techniques to determine the type of nutrient deficiency that occurs on the plant leaf. A combination of Gray-Level Co-Occurrence Matrix (GLCM), hu-histogram and color histogram has been used as a parameter for further classification process. Random forest technique was used as classifiers manage to achive 78.35% of accuracy. It shows random forest is a suitable classifier for nutrient deficiency detection in maize leaves. More machine learning algorithm will be tested to increase current accuracy.
Volume: 9
Issue: 2
Page: 304-309
Publish at: 2020-06-01

Electrical energy production from plant biomass: an analysis model development for Pandanus Amaryllifolius plant microbial fuel cell

10.11591/ijeecs.v18.i3.pp1163-1171
Teng Howe Cheng , Kok Boon Ching , Chessda Uttraphan , Yee Mei Heong
Plant microbial fuel cell (P-MFC) is an electrochemical reactor that converts organic compounds to electrical energy through the catalytic reaction from electrochemically active bacteria (EAB). However, there is no sign of an attempt in developing the functional model in predicting the energy conversion and utilization of P-MFC. In this study, an analytic model is proposed to show the whole production process of the organic compound to electrical energy generation. Pandanus Amaryllifolius plant was used as sources of photosynthate, where biomass product from rhizodeposition, acetate was produced, and soil bacteria as the microbial culture, and air as the input to the cathode chamber. The proposed analytical model is able to predict the output of the P-MFC using the parameters from the experiment. The generated data from the model was then compared with the monitored data from the Pandanus Amaryllifolius P-MFC. The results show the electrical power output has a high similarity pattern with the bacterial growth curve model and able to achieve the coulombic efficiency of 95.32%.
Volume: 18
Issue: 3
Page: 1163-1171
Publish at: 2020-06-01

An efficient resource sharing technique for multi-tenant databases

10.11591/ijece.v10i3.pp3216-3226
Pallavi G. B. , P. Jayarekha
Multi-tenancy is one of the key components of cloud computing environment. Multi-tenant database system in SaaS (Software as a Service) has gained a lot of attention in academics, research and business arena. These database systems provide scalability and economic benefits for both cloud service providers and customers(organizations/companies referred as tenants) by sharing same resources and infrastructure in isolation of shared databases, network and computing resources with Service level agreement (SLA) compliances. In a multitenant scenario, active tenants compete for resources in order to access the database. If one tenant blocks up the resources, the performance of all the other tenants may be restricted and a fair sharing of the resources may be compromised. The performance of tenants must not be affected by resource-intensive activities and volatile workloads of other tenants. Moreover, the prime goal of providers is to accomplish low cost of operation, satisfying specific schemas/SLAs of each tenant. Consequently, there is a need to design and develop effective and dynamic resource sharing algorithms which can handle above mentioned issues. This work presents a model embracing a query classification and worker sorting technique to efficiently share I/O, CPU and Memory thus enhancing dynamic resource sharing and improvising the utilization of idle instances proficiently. The model is referred as Multi-Tenant Dynamic Resource Scheduling Model (MTDRSM) .The MTDRSM support workload execution of different benchmark such as TPC-C(Transaction Processing Performance Council), YCSB(The Yahoo! Cloud Serving Benchmark)etc. and on different database such as MySQL, Oracle, H2 database etc. Experiments are conducted for different benchmarks with and without SLA compliances to evaluate the performance of MTDRSM in terms of latency and throughput achieved. The experiments show significant performance improvement over existing Mute Bench model in terms of latency and throughput.
Volume: 10
Issue: 3
Page: 3216-3226
Publish at: 2020-06-01

Social aspects role and the behavior of drinking water among students in a private university

10.11591/ijere.v9i2.20432
Sitti Nur Djannah , Ratu Matahari
Lack of consuming drink water can cause many effects on the body. The long term effects of less consuming water dangerous for health. The diseases related to the less consuming water are respiratory tract infections, gastrointestinal disease, urinary infections, cancer, diabetic, kidney disease, and also others metabolic disorders. Those diseases affected to the financial burden due to this situation. It happens because of some factors, many studies mentioned about the behavior of drinking water among adolescents in school affected by some sociodemographic and behavioral factors. This study shows that most of respondents have a bad habit to keep their health kidney it is evident that the majority of respondents have urine color that tends to concentrated which is categorized as unhealthy urine. The limitation of the study was not measure the amount of drink water consuming for each respondents per day.
Volume: 9
Issue: 2
Page: 374-378
Publish at: 2020-06-01

Mobile edge computing for internet of things (IoT): security and privacy issues

10.11591/ijeecs.v18.i3.pp1486-1493
Atiqur Rahman , Guangfu Wu , Ali Md Liton
Nowadays, the masonry for environment-friendly and protected network structure designs, for example, the Internet of Things and gigantic data analytics are increasing at a faster pace compared to an earlier state. Mobile edge computing for an Internet of Things widget is information processing that is achieved at or close to the collectors of information in an Internet of Things system. Herein, we are proposing to temporarily evaluation the concepts, features, protection, and privacy applications of Internet of Things authorized mobile edge computing with its data protection view in our data-driven globe. We focus on illuminating one of kind components that need to be taken into consideration whilst creating a scalable, consistent, impenetrable and disseminated mobile edge computing structure. We also sum up the fundamental ideas regarding security threat alleviation strategies. After that, we walk around the existing challenges and opportunities in the area of mobile edge computing. In conclusion, we analyze a case study, in which a security protection mechanism can be hardened to lift out everyday jobs.
Volume: 18
Issue: 3
Page: 1486-1493
Publish at: 2020-06-01

Energy-economic-environmental analysis of solar drying system: a review

10.11591/ijpeds.v11.i2.pp1011-1018
Wan Nurlaila Yusra Mat Desa , Ahmad Fudholi , Zahira Yaakob
Solar drying is an emerging technology to preserve wide range of products from agriculture to animal-based products. The application of solar dryers, however must be evaluated to determine its benefit and effectiveness. In the evaluation of solar dryer performance, three criteria which are most important to look at are thermal performance, economic cost and environmental implications. Therefore, this paper attempts to review the thermoeconomic analysis and environmental evaluation on various solar drying system. Performance equations in energy–economic–environment analyses for solar drying syistems evaluation are presented. The CO2 emission, carbon mitigation, and earned carbon credit of various solar drying syistem are also presented.
Volume: 11
Issue: 2
Page: 1011-1018
Publish at: 2020-06-01

Feasibility analysis of standalone PV powered battery using SEN for Smart Grid

10.11591/ijpeds.v11.i2.pp667-676
Syed Zahurul Islam , Mohammad Lutfi Othman , Norman Mariun , Hashim Hizam , Nur Ayuni
In Smart Grid (SG) communication network, sensors integrated communication radios namely ZigBee, Wi-Fi, and Bluetooth are becoming urgent and crucial part of SG wireless communication. Sensor nodes are generally battery powered. With the enhancement and huge utilization of sensor technologies, batteries have not been improved significantly at the same pace. However, batteries are essential to power the sensor nodes and there is no alternative of this energy bank. Therefore, to provide seamless power to the nodes is a challenge when the nodes are meant for integrating distributed renewable generations for years. Necessitate of the battery replacement is not often cost effective when the batteries are drained out. This paper presents a feasibility study of standalone Photovoltaic (PV) powered battery using Sensors-radios integrated Embedded Node (SEN) for SG application. In this study, we have analyzed charging characteristics of a lead-acid battery that can be recharged during day time by a PV module. The aim of this research is to testify the two simultaneous jobs- (i) the battery is sufficient to power Sensors-ZigBee integrated Arduino (SZA) for at least one day operation, (ii) scrutiny the optimal size of PV for recharging the battery considering three different day variations- average, cloudy, and full rainy day. The result from real data analysis reveals that the module is sufficient to recharge the battery on an average day; however, it is not sufficient for full cloudy or full rainy day. Finally, a mathematical model is obtained from regression analysis that shows battery internal resistance is exponential to voltage on both full cloudy and rainy day, but it is linear on average day.
Volume: 11
Issue: 2
Page: 667-676
Publish at: 2020-06-01

Perception of peace among pre-service teachers

10.11591/ijere.v9i2.20577
Tuğba Selanik Ay , Abdullah Gokdemir
This research was carried out to determine pre-service teachers' perceptions of “peace”. This was a qualitative research based on case studies scenarios and document analysis. The sample of the study consists of 180 teacher-candidates studies in the social sciences and primary education at a state university in the Aegean Region of Turkey. These Preservice teachers were given scenarios and asked to retain the five scenarios given to them. In this context, in the study, of the document types personal documents and peace-related sample case scenarios retained by teacher candidates themselves were used. The scenarios gathered are examined as a document and subjected to content analysis, and the data obtained are presented in tables and supported with direct quotations. As a result of the findings obtained from sample case study scenarios, themes of peace were obtained in the context of the teaching profession, in daily life, in the national and universal context. In the context of teacher behaviors and methods and techniques that can be used to bring peace value, teacher candidates’ state creating a democratic classroom climate, enabling free discussion of ideas and encouraging children to empathize. In addition,pre-service teachers stressed the importance of being a role-model and encouraging students to empathize under the theme of teacher behaviors supporting the value of peace.
Volume: 9
Issue: 2
Page: 427-438
Publish at: 2020-06-01

Relative stability enhancement for brushed DC motor using a PLL interfaced with LabVIEW

10.11591/ijpeds.v11.i2.pp735-742
Mostafa Mahmoud , Ahmed El-Biomey , El-sayed Soliman Ahmed
This work presents a fast response and stable computer based a brushed DC motor speed controller.  The controller configured of gate drive circuits for H-Bridge accompanied with data acquisition unit DAQ-6211. These gate drive circuits include, phase comparator, current booster and wave forms cleaning circuits.  An optical encoder is used for motor speed to frequency conversion. The CD4046 PLL chip compares phases of the encoder output frequency (motor speed) with a reference frequency (desired speed). The obtained phase difference (error) is used to allocate the suitable PWM duty cycles.  An H-Bridge BJT switches driven by PWM is interfaced with the motor. The system hardware is provided with a simple and accurate data acquisition unit DAQ-6211 to be interfaced with the LabVIEW software Package. This allows monitoring and storing the different measured data of this platform. The system relative stability is determined and examined based on the Bode plot analysis and design. Then the relative stability criterion (Phase Margin) is measured the closed-loop stability of the system. This system considers the fast feedback response with indication of its stability state as well as the stable wide dynamic range. It compensates the changes in system parameters due to the environmental effects and other disturbances.
Volume: 11
Issue: 2
Page: 735-742
Publish at: 2020-06-01

Integration of STATCOM and ESS for power system stability improvement

10.11591/ijpeds.v11.i2.pp859-869
Ibrahim Alhamrouni , Rasyid Ismail , Mohamed Salem , Bazilah Ismail , Awang Jusoh , Tole Sutikno
The power system enters a state of voltage instability due to the inability of the power system to meet the demand for active power and reactive power due to the increase of system load. In order to stabilize the power system, the installation of STATCOM and ESS needs to be performed. The main objective of this study is to identify the suitable size and location of STATCOM and ESS for power system stability improvement. First, the IEEE 14 bus system was simulated using DIgSILENT software in ideal condition. Then, the system loadability was increased up to 200% of initial value to locate the weakest bus. This study includes the applicable location and sizing of STATCOM and ESS towards improving power system stability. The results showed that the application of STATCOM and ESS with the most reliable size can increase the bus voltage (p.u and kV) of IEEE 14 bus system thus improving the power system stability. For recommendation, the power system stability can be improved by installing multiple STATCOM and ESS at other load buses and applying a controller to both STATCOM and ESS to improve the effectiveness of generating and absorbency of active and reactive power in the power system.
Volume: 11
Issue: 2
Page: 859-869
Publish at: 2020-06-01

Trajectory reconstruction for robot programming by demonstration

10.11591/ijece.v10i3.pp3066-3073
Reda Hanifi Elhachemi Amar , Laredj Benchikh , Hakima Dermeche , Ouamri Bachir , Zoubir Ahmed-Foitih
The reproduction of hand movements by a robot remains difficult and conventional learning methods do not allow us to faithfully recreate these movements because it is very difficult when the number of crossing points is very large. Programming by Demonstration gives a better opportunity for solving this problem by tracking the user’s movements with a motion capture system and creating a robotic program to reproduce the performed tasks. This paper presents a Programming by Demonstration system in a trajectory level for the reproduction of hand/tool movement by a manipulator robot; this was realized by tracking the user’s movement with the ArToolkit and reconstructing the trajectories by using the constrained cubic spline. The results obtained with the constrained cubic spline were compared with cubic spline interpolation. Finally the obtained trajectories have been simulated in a virtual environment on the Puma 600 robot.
Volume: 10
Issue: 3
Page: 3066-3073
Publish at: 2020-06-01

CPW fed SRR loaded monopole antenna for triple band operations

10.11591/ijece.v10i3.pp3145-3151
Smitha K. M. , Aju John K. K. , Thomaskutty Mathew
A planar CPW fed SRR loaded monopole antenna based on split ring resonator with triple-band operations is reported for passive UHF RFID, Wireless Local Area Networks (WLAN) and World Interoperability for Microwave Access (WiMAX) applications. Measured and simulated results show the effect of tapering of the SRR layer on bandwidth improvement and gain enhancement in comparison to monopole with SRR antenna. The CPW fed SRR loaded monopole antenna has a bidirectional pattern with high gain for wireless communication applications.
Volume: 10
Issue: 3
Page: 3145-3151
Publish at: 2020-06-01

Fault tolerance of asymmetrical six-phase induction machine during single open circuit fault to three open circuit faults using GUI

10.11591/ijpeds.v11.i2.pp611-617
Ungku Mohamed Ismail Adrian Ungku Abdul Rahman , Wan Noraishah Wan Abdul Munim , Hang Seng Che , Mahdi Tousizadeh , Khairul Safuan Muhammad
The fault tolerance of multiphase drive is favourable in the industry for its reliability and safety reasons. However, from the educational point of view, the post-fault capability of six-phase machine is still unclear. This paper presents the fault tolerance of asymmetrical six-phase induction machine (A6-IM) under one to three open-circuit faults using Graphical User Interface (GUI). In this study, the capability of A6-IM has been interpreted through a simple and user-friendly GUI helping students to have a better understanding on the current limits of A6-IM. The optimization of post-fault current references is based on maximum torque (MT) and minimum loss (ML). This work provides GUI highlighting the post-fault derating of A6-IM with single isolated neutral (1N) in two different modes namely MT and ML for educational purposes.
Volume: 11
Issue: 2
Page: 611-617
Publish at: 2020-06-01

Optimal placement of wind turbine in a radial distribution network using PSO method

10.11591/ijpeds.v11.i2.pp1074-1081
Yahiaoui Merzoug , Bouanane Abdelkrim , Boumediene Larbi
The aim of this article is to apply the Particle Swarm Optimization (PSO) method to find the best location for the wind turbine in the radial distribution network. The optimal location is found using the loss sensitivity factor. By respecting the constraints of the active power transmitted in the branches and the limits of the voltages modules for all the nodes. The validity of this method is tested on a 33-IEEE test network and the results obtained are compared with the results of basic load flow.
Volume: 11
Issue: 2
Page: 1074-1081
Publish at: 2020-06-01
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