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30,735 Article Results

Design of Maximum Power Point Tracking for Solar Collector Drying System: An Experimental Study

10.11591/ijpeds.v9.i4.pp1799-1803
Saifuddin M. Jalil , Faizar Abdurrahman , Selamat Meliala , Rosdiana Rosdiana
This research describes the performance of maximum power point tracking as a solar collector of PV system integration for agriculture product drying system. The system comprises of solar collector, tracking PV array, the battery bank, the micro controller and the DC converter. This system is design to enhance the work of solar collector in drying process.. This design is hoped to be an appropriate system in order to ensure the maximum result by providing solar radiation energy. This paper shows the experiment data of the voltage and power response in positioning the PV to yield a maximum photovoltaic array output power of solar drying system device.
Volume: 9
Issue: 4
Page: 1799-1803
Publish at: 2018-12-01

Outdoor Performance Evaluation of Building Integrated Photovoltaic Thermal (BIPVT) Solar Collector with Spiral Flow Absorber Configurations

10.11591/ijpeds.v9.i4.pp1918-1925
Adnan Ibrahim , Sohif Mat , Ahmad Fazlizan Abdullah , Ahmad Fudholi , Kamaruzzaman Sopian
Building Integrated Photovoltaic thermal solar collector (BIPVT) with Spiral flow absorber design is a collector not only used to generate electricity and thermal energy simultaneously but also can be integrated with the roof. Due to it characteristic as a roof, the collector is exposed to the direct sunlight resulting from a higher temperature on it surfaces. The temperature increased will simultaneously decrease it efficiency. An experiment has been conducted outdoor at Universiti Kebangsaan Malaysia to examine and evaluate the efficiency of the collector. Data for the experiment has been collected and gathered from 08:00 to 17:00 respectively. Results from the experiment recorded the best total efficiency of 65.10% (53.64% thermal efficiency and 11.46% electrical efficiency from the PV panel) at mass flow rate of 0.041kg/s and solar radiation of 1148W/m2. The effect of mass flow rates on open circuit voltage (Voc) and the modules short circuit current (Isc) are also presented.
Volume: 9
Issue: 4
Page: 1918-1925
Publish at: 2018-12-01

Improvement Potential and Exergy Analyses of Photovoltaic Thermal with and without ∇-absorber Collector

10.11591/ijpeds.v9.i4.pp1792-1798
Saprizal Hadisaputra , Muhammad Zohri , Hardani Hardani , Ahmad Fudholi
The combination of a solar thermal and photovoltaic system is called photovoltaic thermal system (PVT). The PVT system with and without -absorber has been intended to harvest both hot air and electricity. The hot air that is produced is used in the cooling process of the photovoltaic panel and then to improve the efficiency of the photovoltaic panel. The experimental investigation was conducted at the mass flow rate from 0.0069 kg/s to 0.0491 kg/s and solar radiation of 522 W/m2 and 820 W/m2 in the National University of Malaysia. The using -absorber collector increases exergy and exergy efficiency of PVT system. The improvement potential comparatively upsurges with cumulative the mass flow rate.
Volume: 9
Issue: 4
Page: 1792-1798
Publish at: 2018-12-01

Parents’ Roles in Overcoming Elementary Students’ Learning Difficulties

10.11591/ijere.v7i4.15015
Ika Maryani , Noven Kusainun , Laila Fatmawati , Vera Yuli Erviana , Muhammad Nur Wangid , Ali Mustadi
This research aims to identify learning problems and the parents’roles in overcoming learning difficulties of 5th-grade students of Muhammadiyah Karangturi Elementary School, Bantul, Yogyakarta. Research participants were six students with learning difficulties, six parents, and four teachers. Selection of subjects used purposive sampling technique. Research object was the parents’ roles in overcoming students’ learning difficulties. This research was a qualitative research with data collection techniques in the form of observation, interviews, and documentation. Data analysis technique was the interactive model (data collection, data reduction, data models, and drawing conclusions). The results showed that the problems experienced by students with learning difficulties in Muhammadiyah Karangturi Elementary School were lower than average learning outcomes, slow understanding, and lack of reasonable attitudes, behavior, and emotional symptoms during the learning process. The parents’ roles in overcoming students’ learning difficulties are finding tutoring institutions for children, accompanying children when coming and going home from school, being good listeners, accompanying learning activities at home, taking children on the first day of school, meeting with teachers through parents association, and present at the distribution of learning outcomes report card.
Volume: 7
Issue: 4
Page: 305-312
Publish at: 2018-12-01

Modeling Solar Modules Performance Under Temperature and Solar Radiation of Western Iraq

10.11591/ijpeds.v9.i4.pp1842-1850
Zaid Hussein Ali , Abdullah Khalid Ahmed , Amer Tayes Saeed
This paper demonstrates a mathematical representation of Photovoltaic (PV) solar cells and hence panels performance. One-diode solar cell model is implemented to simulate the cell and extract the performance indications. The tested PV modules are BP Solar (60 Watt) and Synthesis Power (50 Watts), which are operating in a PV generation system in the University of Anbar - Iraq, College of Applied Sciences. The math model demonstrates Power versus Voltage (P-V) characteristic curves to depict and study various parameters with affecting variations in the PV array performance. The parameters include ambient and cell temperature degrees and solar irradiance (G) level which are the main elements to dictate the productivity of a solar system. G is represented by sun unit (1 sun=1 kW/m2). The outcomes of the simulation model characteristics curves have been compared with curves provided by the tested modules data sheets. MATLAB software has been used to simulate the model and extract the results. This paper also investigated photovoltaic simulation with maximum power point tracking (MPPT) converter to evaluate hence predict the behaviors of the whole photovoltaic DC current generation using PSIM Power Electronics program. The model focuses on the basic components in PV systems; The panel and the DC-DC converter. The modeling outcome data will be used as a reference verifying the performance of the tested modules during the year seasons under the dominating dusty hot weather in western Iraq.
Volume: 9
Issue: 4
Page: 1842-1850
Publish at: 2018-12-01

Study of Grid Connected Wind Energy System with Fuzzy Logic Based MPPT Controller

10.11591/ijra.v7i4.pp251-261
Jayalakshmi N. S , Sachin S
Renewable energy sources (RESs) are gaining more importance due to depleting fossil fuel sources in few decades. When compared to other RESs wind energy system is widely available and user friendly in nature. This paper presents modelling and simulation of grid connected PMSG based wind energy conversion system with P&O maximum power point tracking (MPPT) control technique.  The PQ controller is used for grid tied inverter to exchange real and reactive power with DC bus voltage regulation. The fuzzy logic controller (FLC) is used for MPPT implementation as it provides better performance as compared to the traditional PID controllers. The various case studies are considered for power management between wind system and the utility grid and the results are evaluated in MATLAB/ Simulink platform.
Volume: 7
Issue: 4
Page: 251-261
Publish at: 2018-12-01

Optimization Based Liver Contour Extraction of Abdominal CT Images

10.11591/ijece.v8i6.pp5061-5070
Jayanthi Muthuswamy , B Kanmani
This paper introduces computer aided analysis system for diagnosis of liver abnormality in abdominal CT images. Segmenting the liver and visualizing the region of interest is a most challenging task in the field of cancer imaging, due to small observable changes between healthy and unhealthy liver. In this paper, hybrid approach for automatic extraction of liver contour is proposed. To obtain optimal threshold, the proposed work integrates segmentation method with optimization technique in order to provide better accuracy. This method uses bilateral filter for preprocessing and Fuzzy C means clustering (FCM) for segmentation. Mean Grey Wolf Optimization technique (mGWO) has been used to get the optimal threshold. This threshold is used for segmenting the region of interest. From the segmented output, largest connected region are identified using Label Connected Component (LCC) algorithm. The effectiveness of proposed method is quantitatively evaluated by comparing with ground truth obtained from radiologists. The performance criteria like dice coefficient, true positive error and misclassification rate are taken for evaluation.
Volume: 8
Issue: 6
Page: 5061-5070
Publish at: 2018-12-01

M-ITRS: Mathematical Model for Identification of Tandem Repeats in DNA Sequence

10.11591/ijai.v7.i4.pp179-184
Ajay Kumar , Sunita Garhwal
In DNA, tandem repeat consists of two or more contiguous copies of a pattern of nucleotides. Tandem repeats of the motif are useful in many applications like molecular biology (related to genetic information of inherited diseases), forensic medicines, DNA fingerprinting and molecular markers for cancer. Various researchers designed formal models and grammars to identify two contiguous copies of the pattern. Tree-adjoining grammar cannot be designed for k-copy language. There is a need to design a formal model which will work for more than two contiguous copies of the pattern. In this paper, we have designed deep pushdown automata for k-continuous copies of the pattern for . The proposed formal model will also identify the tandem repeats without specifying the pattern and its size.
Volume: 7
Issue: 4
Page: 179-184
Publish at: 2018-12-01

Self-tuning Fuzzy Task Space Controller for Puma 560 Robot

10.11591/ijra.v7i4.pp273-282
Azita Azarfar
Since in most robot applications the desired paths are determined in task space or Cartesian space, it is important to control the robot arm in task space. In this paper a fuzzy controller with modifiable scaling factors is proposed to control the robot end-effector in task space. The controller is a fuzzy system with a mechanism to change the scaling factors when the error is bounded under a predetermined value. The controller is designed in joint space and is developed to work space by using inverse Jacobian strategy. The simulations results on Puma 560 robot manipulator illustrate the high performance of presented control method.
Volume: 7
Issue: 4
Page: 273-282
Publish at: 2018-12-01

Analytically Modeling, Design and Analysis a Nonlinear Controller for a STATCOM operations

10.11591/ijra.v7i4.pp221-231
J. K. Moharana
The concept of H Control is extended, in principle, to the SVPWM (Space Vector Pulse Width Modulation) based inverter switching of a STATCOM (STATic synchronous COMpensator) device. The SVPWM assures a greater value of modulation factor in the undermodulation as well as the overmodulation range compared to SPWM (Sine Pulse Width Modulation) i.e. a much higher fundamental content. In the present work, the STATCOM has been modeled and its model is nonlinear in  (phase angle between fundamental of system voltage and output voltage of STATCOM. The effect of increased modulation index and lower harmonic distortion has been studied through simulation w.r.t. different performance indices and dynamic response of relevant variables. A PI and an H Controller have been designed for closed-loop control of the system. It is found through simulation that H controller gives better response than PI controller for nonlinear system.
Volume: 7
Issue: 4
Page: 221-231
Publish at: 2018-12-01

The Examination of the 4th Graders’ Reading Comprehension Skills in Terms of the Sentiments Given in Reading Texts

10.11591/ijere.v7i4.13969
Esra Çetin , Sabri Sidekli
This study aims to investigate reading comprehension skills of the 4th graders in terms of the sentiments given in the reading text and to reveal that whether there is a meaningful difference for reading comprehension skills of different student groups or not.The sampling of the study has been selected randomly and it has been limited in primary schools in Muğla, Turkey. The sampling has been covered totally 387 4th graders, 209 of them have been female and 178 of them have been male students. The data collection instruments in the study have been determined as a personal information form and an achievement test on reading comprehension skills in terms of sentiments given in the reading texts. The answers of the students for the achievement test have been analyzed via percentage, frequency and arithmetic mean.According to the findings of the study; For the sentiments given in the reading texts, in line, the mostly understandable sentiments are happiness, fear and sadness. Additionally, there was a mean difference in terms of the level of reading comprehension skills. The students were mostly aware of texts containing happiness, and they understood sorrow in texts at least.
Volume: 7
Issue: 4
Page: 317-330
Publish at: 2018-12-01

Revealing AES Encryption Device Key on 328P Microcontrollers with Differential Power Analysis

10.11591/ijece.v8i6.pp5144-5152
Septafiansyah Dwi Putra , Adang Suwandi Ahmad , Sarwono Sutikno , Yusuf Kurniawan , Arwin Datumaya Wahyudi Sumari
This research demonstrates the revealing of an advanced encryption standard (AES) encryption device key. The encryption device is applied to an ATMEGA328P microcontroller. The said microcontroller is a device commonly used in internet of things (IoT). We measured power consumption when the encryption process is taking place. The message sent to the encryption device is randomly generated, but the key used has a fixed value. The novelty of this research is the creation of a systematic and optimal circuit in carrying the differential power analysis or difference of means (DPA/DoM) technique, so the technique can be applied in key revealing on a microcontroller device by using 500 traces in 120 seconds.
Volume: 8
Issue: 6
Page: 5144-5152
Publish at: 2018-12-01

Mediation Effect of Resilience on The Relationship Between Self-Efficacy and Competitiveness Among University Students

10.11591/ijere.v7i4.15725
Kingston K.F. Moke , Calvin K.W. Chang , Kususanto Prihadi , Chee Leong Goh
This study aims to evaluate the mediation role of resilience on the link between self-efficacy and competitiveness among university students in Malaysia. One hundred and thirty-six participants from several universities in Malaysia were recruited to respond to an online form consisted of the following scales: adapted versions of brief resilience scale from Smith et al, self-efficacy scale from Biemann, Kearney and Marggraf, and Personal Development Competitive Attitude Scale  from Ryckman, Hammer, Kaczor and Gold. Data was analyzed by using SPSS with PROCESS Macro and full mediation has been observed. Bias-corrected bootstrap confidence interval test indicated that the indirect effect of self-efficacy on competitiveness was significant and the Sobel test had confirmed the significance of the mediation. Further discussion, limitation and suggestion are discussed in the end of the paper.
Volume: 7
Issue: 4
Page: 279-284
Publish at: 2018-12-01

Backstepping Control for MPPT and UPF of a Three Phase Single Stage Grid Connected PV System

10.11591/ijra.v7i4.pp262-272
M. El malah , A. Ba-razzouk , M. Guisser , E. Abdelmounim , M. Madark
This paper presents a new control methodology of a three phase grid connected photovoltaic system without using the intermediary DC/DC converter. Based on the synchronized nonlinear model of the whole photovoltaic system, two controllers have been proposed for the three-phase inverter in order to ensure the operation of the PV system at the maximum power point with unity power factor and minimum grid disturbance. Grid synchronization has been ensured by a three-phase 2nd order PLL (Phase-Locked Loop). The stability of each controller is demonstrated by means of Lyapunov analysis and evaluated under changing atmospheric conditions using the Matlab/Simulink environment, the simulation results clearly demonstrate the performance provided by each controller.
Volume: 7
Issue: 4
Page: 262-272
Publish at: 2018-12-01

Provisioning of Street Lighting based on Ambience Intensity for Smart City

10.11591/ijeecs.v12.i3.pp1401-1406
Rajina R Mohamed , Mohamad A Mohamed , Arniyati Ahmad , Muhamad A H Abd Halim
Street lighting is a component that require an efficient energy management system for comprehensive energy savings. It should provide ultimate comfort and safety to road users that contribute to the stability of economy and social of the country as well to the smart city development. Currently many street lighting especially in Malaysia, which is ON in the evening and OFF before the sun sets without taking into consideration the ambient brightness and also the number of vehicles. This condition may increase the use of energy as well as dangerous to motorist. Thus this Ambient Street Lighting project was developed using embedded-based Arduino microcontroller for lighting management based on the circumstances surrounding of the road. A threshold value is set based on a reading of the actual situation in order to test the functionality of the prototype. The Ambient Street Lighting prototype have reacted with success towards surrounding brightness/darkness and number of cars passing by on the street.
Volume: 12
Issue: 3
Page: 1401-1406
Publish at: 2018-12-01
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