2018 2nd European Conference on Electrical Engineering and Computer Science (EECS), 2018
This paper introduces an efficient and simple method for extracting the parameters of a solar cel... more This paper introduces an efficient and simple method for extracting the parameters of a solar cell described by a single diode model. Given the IV curve of the solar cell, the method starts with random parameters and relies on an iterative process that moves five key points from the simulated I-V curve closer and closer to the real curve. The implementation of this method gives excellent results in just a few iterations. It also confirms a previously reported fact that quasi-similar I-V curves can be obtained by different sets of parameters.
2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), 2015
In most practical cases, a PV array is constructed from a combination of standard PV units (solar... more In most practical cases, a PV array is constructed from a combination of standard PV units (solar cells or panels) connected in series and/or in parallel to obtain the desired power, voltage and current ratings. However, the non-linear behavior of solar cells or panels makes accurate determination of the model parameters a difficult task. A precise determination of the internal physical parameters of cells and panels is not always possible because of the non-uniqueness of the solution. As a result, some parameters of the PV panel model are estimated with non-negligible errors. In this paper, an advanced ANN-based determination approach of PV array parameters from individual cell/panel characteristics is developed for single-diode model. A proper selection of the training points for the ANN is also introduced to improve the estimation of the model. Simulation results obtained for simple case studies using Matlab/Simulink software are presented and discussed. The proposed ANN-based technique made possible more accurate determination of the parameters of the single-diode model with mean errors below 1% for all parameters except for the diode saturation and diffusion current which reached 11%.
We investigate the asymptotic behavior of the recursive difference equation yn+1 = (α+ βyn)/(1 + ... more We investigate the asymptotic behavior of the recursive difference equation yn+1 = (α+ βyn)/(1 + yn−1) when the parameters α < 0 and β ∈ R. In particular, we establish the boundedness and the global stability of solutions for different ranges of the parameters α and β. We also give a summary of results and open questions on the more general re-cursive sequences yn+1 = (a+ byn)/(A+Byn−1), when the parameters a,b,A,B ∈ R and abAB = 0.
Research has established that class attendance and High School Grade Point Average (HSGPA) play a... more Research has established that class attendance and High School Grade Point Average (HSGPA) play a significant role in student academic success in higher education. The study uses census data and re...
In this paper, we show that the performance of invariant moments in shape recognition can be sign... more In this paper, we show that the performance of invariant moments in shape recognition can be significantly improved. This is achieved without any additional computational cost by taking the moments of 3 to 4 annuli around the center of gravity of a given picture. Our idea is applied to different datasets of leaves and achieves in some cases an improvement of the recognition rate from 57% to 84%.
Among 352 174 airline travelers entering Qatar, 8236 (2.34%) tested positive on or within the fir... more Among 352 174 airline travelers entering Qatar, 8236 (2.34%) tested positive on or within the first seven days of arrival, with 3789 (1.08%) testing positive at the time of arrival and the remaining 4447 (1.26%) testing negative at arrival but positive 1 week later.
Integrals and sums involving special functions are in constant demand in applied mathematics. Rat... more Integrals and sums involving special functions are in constant demand in applied mathematics. Rather than refer to a handbook of integrals or to a computer algebra system, we present a do-it-yourself systematic approach that shows how the evaluation of such integrals and sums can be made as simple as possible. Illustrating our method, we present several examples of integrals of Poisson type, Fourier transform, as well as integrals involving product of Bessel functions. We also obtain a new identity involving the sums of 2 F 1 .
Using Poincar e's method and a Lyapanov-Schmidt reduction, a continuation theorem for resonant pe... more Using Poincar e's method and a Lyapanov-Schmidt reduction, a continuation theorem for resonant periodic orbits of periodically forced oscillators is proved that does not require the unperturbed manifold of periodic solutions to be normally nondegenerate. This is accomplished with the aid of a generalization of the Poincar e-Melnikov function that includes second derivatives and with the introduction of associated families of di erential equations where the bifurcation parameter is a power of the original small parameter. Incidentally, a result of
PeachFuzz 2000. 19th International Conference of the North American Fuzzy Information Processing Society - NAFIPS (Cat. No.00TH8500), 2000
... In particular; it does not require the spec-ification of the optimal number of clusters, and ... more ... In particular; it does not require the spec-ification of the optimal number of clusters, and it is not sen-sitive to noise and outliers. ... For example, fireflies communicate through light flashes, and crickets exchange chirps. The mathemat-Mohamed Ben Hadj Rhouma CDSNS, Dept. ...
Finite difference schemes of various eigenvalue problems are used to generate size, rotation, and... more Finite difference schemes of various eigenvalue problems are used to generate size, rotation, and translation invariant sets of features for shape recognition and classification of binary images. These feature sets are based on the eigenvalues of the Dirichlet Laplacian, the clamped plate problem, and the buckling problem. The stability and effectiveness of these features is demonstrated by using them in the classification of 6 types of computer generated and hand-drawn shapes. The classification was done using 4 to 20 features fed to simple feed-forward neural networks trained using the backpropagation algorithm. All features performed very well and correct classification rates of up to 99.7% were achieved on the computer generated shapes and 97.2% on the hand-drawn shapes.
Most of the studies conducted on solar energy assessment and solar system siting focus on flat te... more Most of the studies conducted on solar energy assessment and solar system siting focus on flat terrains that are usually difficult and expensive to acquire in urban areas. This paper investigates the possibility of using inclined terrains for siting photovoltaic (PV) power plants surrounding urban area. Both analytical analysis and simulations are carried out in order to analyse and validate the effectiveness and benefits of the use of inclined land for PV siting. Geographical information system and numerical weather prediction were used to implement the suggested original approach and to select suitable inclined terrains for the PV system installation and to calculate the total generation potential for energy production. Muscat, the capital of Oman, was selected as a reference for the implementation of this approach.
This paper assesses the potential solar power for the PV roof integration system using the Geogra... more This paper assesses the potential solar power for the PV roof integration system using the Geographic Information System (GIS). The residential area of Seeb (Muscat-Oman) was investigated as a case study. The constraint of the roof optimization for the optimal design of solar photovoltaic fields consisting of multiple rows was analyzed and the optimal area of deployment of PV collectors was calculated taking into account orientation, shading and masking of adjacent rows. A MATLAB program was developed in order to estimate the total roof-PV power capacity and total annual energy generation. The program takes into account the different factors that affect the efficiency of the PV. The results show that, if we consider 10 hours as a daily average of sunshine, the total roof PV panels in the Seeb area will be equivalent to a 300MW power generation plant.
... Engineering Dept University of West Florida mkhabou@uwf.edu Mohamed BH Rhouma Mathematics and... more ... Engineering Dept University of West Florida mkhabou@uwf.edu Mohamed BH Rhouma Mathematics and Statistics Dept Sultan Qaboos University rhouma@squ.edu.om Lotfi Hermi Mathematics Dept University of Arizona hermi@math.arizona.edu Abstract ...
Proceedings 2001 IEEE International Conference on Data Mining, 2001
This paper introduces a new scalable approach to clustering based on synchronization of pulse-cou... more This paper introduces a new scalable approach to clustering based on synchronization of pulse-coupled oscillators. Each data point is represented by an integrate-and-fire oscillator, and the interaction between oscillators is defined according to the relative similarity between the points. The set of oscillators will self-organize into stable phase-locked subgroups. Our approach proceeds by loading only a subset of the data and allowing it to self-organize. Groups of synchronized oscillators are then summarized and purged from memory. We show that our method is robust, scales linearly, and can determine the number of clusters. The proposed approach is empirically evaluated with several synthetic data sets and is used to segment large color images.
2018 2nd European Conference on Electrical Engineering and Computer Science (EECS), 2018
This paper introduces an efficient and simple method for extracting the parameters of a solar cel... more This paper introduces an efficient and simple method for extracting the parameters of a solar cell described by a single diode model. Given the IV curve of the solar cell, the method starts with random parameters and relies on an iterative process that moves five key points from the simulated I-V curve closer and closer to the real curve. The implementation of this method gives excellent results in just a few iterations. It also confirms a previously reported fact that quasi-similar I-V curves can be obtained by different sets of parameters.
2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), 2015
In most practical cases, a PV array is constructed from a combination of standard PV units (solar... more In most practical cases, a PV array is constructed from a combination of standard PV units (solar cells or panels) connected in series and/or in parallel to obtain the desired power, voltage and current ratings. However, the non-linear behavior of solar cells or panels makes accurate determination of the model parameters a difficult task. A precise determination of the internal physical parameters of cells and panels is not always possible because of the non-uniqueness of the solution. As a result, some parameters of the PV panel model are estimated with non-negligible errors. In this paper, an advanced ANN-based determination approach of PV array parameters from individual cell/panel characteristics is developed for single-diode model. A proper selection of the training points for the ANN is also introduced to improve the estimation of the model. Simulation results obtained for simple case studies using Matlab/Simulink software are presented and discussed. The proposed ANN-based technique made possible more accurate determination of the parameters of the single-diode model with mean errors below 1% for all parameters except for the diode saturation and diffusion current which reached 11%.
We investigate the asymptotic behavior of the recursive difference equation yn+1 = (α+ βyn)/(1 + ... more We investigate the asymptotic behavior of the recursive difference equation yn+1 = (α+ βyn)/(1 + yn−1) when the parameters α < 0 and β ∈ R. In particular, we establish the boundedness and the global stability of solutions for different ranges of the parameters α and β. We also give a summary of results and open questions on the more general re-cursive sequences yn+1 = (a+ byn)/(A+Byn−1), when the parameters a,b,A,B ∈ R and abAB = 0.
Research has established that class attendance and High School Grade Point Average (HSGPA) play a... more Research has established that class attendance and High School Grade Point Average (HSGPA) play a significant role in student academic success in higher education. The study uses census data and re...
In this paper, we show that the performance of invariant moments in shape recognition can be sign... more In this paper, we show that the performance of invariant moments in shape recognition can be significantly improved. This is achieved without any additional computational cost by taking the moments of 3 to 4 annuli around the center of gravity of a given picture. Our idea is applied to different datasets of leaves and achieves in some cases an improvement of the recognition rate from 57% to 84%.
Among 352 174 airline travelers entering Qatar, 8236 (2.34%) tested positive on or within the fir... more Among 352 174 airline travelers entering Qatar, 8236 (2.34%) tested positive on or within the first seven days of arrival, with 3789 (1.08%) testing positive at the time of arrival and the remaining 4447 (1.26%) testing negative at arrival but positive 1 week later.
Integrals and sums involving special functions are in constant demand in applied mathematics. Rat... more Integrals and sums involving special functions are in constant demand in applied mathematics. Rather than refer to a handbook of integrals or to a computer algebra system, we present a do-it-yourself systematic approach that shows how the evaluation of such integrals and sums can be made as simple as possible. Illustrating our method, we present several examples of integrals of Poisson type, Fourier transform, as well as integrals involving product of Bessel functions. We also obtain a new identity involving the sums of 2 F 1 .
Using Poincar e's method and a Lyapanov-Schmidt reduction, a continuation theorem for resonant pe... more Using Poincar e's method and a Lyapanov-Schmidt reduction, a continuation theorem for resonant periodic orbits of periodically forced oscillators is proved that does not require the unperturbed manifold of periodic solutions to be normally nondegenerate. This is accomplished with the aid of a generalization of the Poincar e-Melnikov function that includes second derivatives and with the introduction of associated families of di erential equations where the bifurcation parameter is a power of the original small parameter. Incidentally, a result of
PeachFuzz 2000. 19th International Conference of the North American Fuzzy Information Processing Society - NAFIPS (Cat. No.00TH8500), 2000
... In particular; it does not require the spec-ification of the optimal number of clusters, and ... more ... In particular; it does not require the spec-ification of the optimal number of clusters, and it is not sen-sitive to noise and outliers. ... For example, fireflies communicate through light flashes, and crickets exchange chirps. The mathemat-Mohamed Ben Hadj Rhouma CDSNS, Dept. ...
Finite difference schemes of various eigenvalue problems are used to generate size, rotation, and... more Finite difference schemes of various eigenvalue problems are used to generate size, rotation, and translation invariant sets of features for shape recognition and classification of binary images. These feature sets are based on the eigenvalues of the Dirichlet Laplacian, the clamped plate problem, and the buckling problem. The stability and effectiveness of these features is demonstrated by using them in the classification of 6 types of computer generated and hand-drawn shapes. The classification was done using 4 to 20 features fed to simple feed-forward neural networks trained using the backpropagation algorithm. All features performed very well and correct classification rates of up to 99.7% were achieved on the computer generated shapes and 97.2% on the hand-drawn shapes.
Most of the studies conducted on solar energy assessment and solar system siting focus on flat te... more Most of the studies conducted on solar energy assessment and solar system siting focus on flat terrains that are usually difficult and expensive to acquire in urban areas. This paper investigates the possibility of using inclined terrains for siting photovoltaic (PV) power plants surrounding urban area. Both analytical analysis and simulations are carried out in order to analyse and validate the effectiveness and benefits of the use of inclined land for PV siting. Geographical information system and numerical weather prediction were used to implement the suggested original approach and to select suitable inclined terrains for the PV system installation and to calculate the total generation potential for energy production. Muscat, the capital of Oman, was selected as a reference for the implementation of this approach.
This paper assesses the potential solar power for the PV roof integration system using the Geogra... more This paper assesses the potential solar power for the PV roof integration system using the Geographic Information System (GIS). The residential area of Seeb (Muscat-Oman) was investigated as a case study. The constraint of the roof optimization for the optimal design of solar photovoltaic fields consisting of multiple rows was analyzed and the optimal area of deployment of PV collectors was calculated taking into account orientation, shading and masking of adjacent rows. A MATLAB program was developed in order to estimate the total roof-PV power capacity and total annual energy generation. The program takes into account the different factors that affect the efficiency of the PV. The results show that, if we consider 10 hours as a daily average of sunshine, the total roof PV panels in the Seeb area will be equivalent to a 300MW power generation plant.
... Engineering Dept University of West Florida mkhabou@uwf.edu Mohamed BH Rhouma Mathematics and... more ... Engineering Dept University of West Florida mkhabou@uwf.edu Mohamed BH Rhouma Mathematics and Statistics Dept Sultan Qaboos University rhouma@squ.edu.om Lotfi Hermi Mathematics Dept University of Arizona hermi@math.arizona.edu Abstract ...
Proceedings 2001 IEEE International Conference on Data Mining, 2001
This paper introduces a new scalable approach to clustering based on synchronization of pulse-cou... more This paper introduces a new scalable approach to clustering based on synchronization of pulse-coupled oscillators. Each data point is represented by an integrate-and-fire oscillator, and the interaction between oscillators is defined according to the relative similarity between the points. The set of oscillators will self-organize into stable phase-locked subgroups. Our approach proceeds by loading only a subset of the data and allowing it to self-organize. Groups of synchronized oscillators are then summarized and purged from memory. We show that our method is robust, scales linearly, and can determine the number of clusters. The proposed approach is empirically evaluated with several synthetic data sets and is used to segment large color images.
Uploads
Papers by Mohamed Rhouma