nagi buaossa - Academia.edu (original) (raw)
Papers by nagi buaossa
2022 IEEE Photonics Conference (IPC)
Frontiers in Optics + Laser Science 2022 (FIO, LS)
The results obtained for Fresnel amplitude coefficients (FCs) corresponding to a magnetic achiral... more The results obtained for Fresnel amplitude coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) interface under variable incident angles and permittivity/permeability ratios, is extended to comparative study between two methods (incidence conditions) for investigating propagation of plane waves with left- and right- circular polarization (LCP & RCP) incident upon a chiral/achiral (CAC) interface.
NAECON 2021 - IEEE National Aerospace and Electronics Conference
The results obtained for Fresnel coefficients (FCs) corresponding to a magnetic achiral/chiral (A... more The results obtained for Fresnel coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) interface under variable incident angles and permittivity/permeability ratios, is extended to examine plane waves with left circular polarization (LCP) and right circular polarization (RCP) incident upon a chiral/achiral (CAC) interface. The reflection and transmission FCs for both modes (RCP and LCP) are considered, and comparisons made between both mode characteristics under variable magnetic permeability with additional dielectric loss.
ArXiv, 2021
Liquid level control is very important in industrial field, where the liquid level is required, a... more Liquid level control is very important in industrial field, where the liquid level is required, and to prevent overflows. The coupled-tank is a common system in industrial control processes. The system consists of two tanks connected together and the liquid flows between them. Tanks contain an inlet and outlet for each tank. The main principle of controlling this system is to maintain a constant level of liquid in both tanks when there are an inflow and outflow of liquid in each tank. To control liquid level in the coupled tank system, the mathematical model of the system had been derived and evaluated as a form of linear model. The mathematical model of coupled tank was developed to apply to both conventional and fuzzy control systems where the dynamic behavior of the system was considered. When the system had been designed the corresponding model was implemented in simulation by using Matlab and Simulink tools.
ArXiv, 2021
Breast cancer is the most common cancer in the world and the most prevalent cause of death among ... more Breast cancer is the most common cancer in the world and the most prevalent cause of death among women worldwide. Nevertheless, it is also one of the most treatable malignancies if detected early. In this paper, a deep convolutional neural network-based algorithm is proposed to aid in accurately identifying breast cancer from ultrasonic images. In this algorithm, several neural networks are fused in a parallel architecture to perform the classification process and the voting criteria are applied in the final classification decision between the candidate object classes where the output of each neural network is representing a single vote. Several experiments were conducted on the breast ultrasound dataset consisting of 537 Benign, 360 malignant, and 133 normal images. These experiments show an optimistic result and a capability of the proposed model to outperform many state-of-the-art algorithms on several measures. Using k-fold cross-validation and a bagging classifier ensemble, we ...
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
In this work, we theoretically investigate the possibility of optical spin to orbital angular mom... more In this work, we theoretically investigate the possibility of optical spin to orbital angular momentum conversion under tight focusing using 4Pi microscopic system. When the incident beam is a vertically polarized vortex beams, by analysis of the polarization states that are associated with the SAM density, we observe spin to orbital localized conversion in the focal vector beam. We further investigate the effect of altering the sign and value of the orbital angular momentum topological charge in the incident vortex beam on the focused beam.
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
Typically, DC energy sources such as photovoltaic and energy storage systems are connected to the... more Typically, DC energy sources such as photovoltaic and energy storage systems are connected to the microgrid through parallel inverters. In order to achieve a balanced power-sharing between these inverters, a proper control strategy is required. In this paper, droop control technique is utilized for a robust operation of two parallel inverters implemented with Metal-Oxide Semiconductor Filed Effect Transistor (MOSFET). The droop controller is implemented in the dq reference frame with the Sinusoidal Pulse Width Modulation (SPWM) being adapted as the switching technique. The droop controller is combined of three control loops: power control loop, voltage control loop and current control loop. All of the control loops are represented by the proportional and integral (PI) controller. The complete structure of the two parallel inverters-based Microgrid with droop controller is presented herein as a basis to derive a mathematical model for the proposed system and the control strategy. The performance of the proposed controller is tested through MATLAB/SIMULINK simulation. The simulation results show that a smooth and robust power-sharing is achieved with a slight variation in frequency and voltage.
Imaging and Applied Optics Congress, 2020
Results obtained for Fresnel coefficients corresponding to a magnetic achiral/chiral interface un... more Results obtained for Fresnel coefficients corresponding to a magnetic achiral/chiral interface under different incident angles and permittivity/permeability ratios, are extended to examine the transmitted amplitude profile of a 2D image/transparency. Both uniform and Gaussian- profile incident beams are considered.
Frontiers in Optics / Laser Science, 2020
Recent work involving image transmission across a magnetic achiral/chiral interface by use of Fre... more Recent work involving image transmission across a magnetic achiral/chiral interface by use of Fresnel coefficients under different incident angles and permittivity/permeability ratios is extended to include dispersive chiral dielectrics with uniform and Gaussian-profile incident beams.
Frontiers in Optics + Laser Science APS/DLS, 2019
2018 9th International Renewable Energy Congress (IREC), 2018
Increasing energy demand led to shifting the focus to the use of the renewable and sustainable en... more Increasing energy demand led to shifting the focus to the use of the renewable and sustainable energy sources. Microgrids (MGs), mainly inverter based, is gaining more importance as they can accommodate various types of renewable energy effectively. Their control is one of the most challenging research areas. In the last few years, many control strategies have been developed. In this paper, the control strategies for AC Microgrids based on hierarchical structures are introduced in different aspects. The control strategies in AC microgrid can be classified into three layers: firstly inner and outer control layer that controls the output current and manages the output active and reactive power of renewable energy sources (RESs), secondly, power sharing control layer that adjusts the amplitude and frequency of the voltage reference values and provides these reference values to inner and outer loops, finally supervisory control layer that restores voltage and frequency with controls the output active and reactive power between utility grid and MG, this control layer can be classified depending on operating mode into two levels: 1. MG supervisory control level or secondary control level, 2. Grid supervisory control level or tertiary level.
Wind Engineering, 2018
Typically, it is desired to operate the wind turbine at the maximum power point. However, in smal... more Typically, it is desired to operate the wind turbine at the maximum power point. However, in small wind turbines which have a storage system integrated with them, harvesting as much energy as possible is more crucial. This may be achieved by reducing the cut-in speed while maximizing the mechanical power. These two goals may be achieved by optimizing the turbine blades. In this article, the turbine blades are optimized using improved blade element momentum theory including Viterna-Corrigan stall model with the objective to yield low cut-in speed and high power level. Using the blade element momentum analysis, the power coefficient curves as functions of tip-speed ratio at various range of wind speeds are obtained for the optimized turbine. Using MATLAB/Simulink tool, a wind energy system, which consists of a wind turbine, permanent magnet synchronous generator and a resistive load, is simulated. The curves obtained from the blade element momentum analysis are used to emulate the win...
The environmental problem of global warming along with the desire to achieve sustainable and rela... more The environmental problem of global warming along with the desire to achieve sustainable and relatively cheap source of energy have motivated many research in the area of renewable energy. Wind energy resource is considered as one of the most promising and rapidly growing compared to other renewable energy resources. In this paper, a practical design of a horizontal wind turbine is implemented. The turbine is mainly composed of turbine blades, a gear box, a DC generator, and electrical controller. These components are designed experimentally in the lab. The main advantages of this system is that it has relatively low cost, operate at low speed at about 2m/s, and it can be easily controlled. It is concluded that such a small-scale turbine may be used to provide the required energy to small DC loads such as communication towers especially in areas that encounter frequent power outage.
2022 IEEE Photonics Conference (IPC)
Frontiers in Optics + Laser Science 2022 (FIO, LS)
The results obtained for Fresnel amplitude coefficients (FCs) corresponding to a magnetic achiral... more The results obtained for Fresnel amplitude coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) interface under variable incident angles and permittivity/permeability ratios, is extended to comparative study between two methods (incidence conditions) for investigating propagation of plane waves with left- and right- circular polarization (LCP & RCP) incident upon a chiral/achiral (CAC) interface.
NAECON 2021 - IEEE National Aerospace and Electronics Conference
The results obtained for Fresnel coefficients (FCs) corresponding to a magnetic achiral/chiral (A... more The results obtained for Fresnel coefficients (FCs) corresponding to a magnetic achiral/chiral (ACC) interface under variable incident angles and permittivity/permeability ratios, is extended to examine plane waves with left circular polarization (LCP) and right circular polarization (RCP) incident upon a chiral/achiral (CAC) interface. The reflection and transmission FCs for both modes (RCP and LCP) are considered, and comparisons made between both mode characteristics under variable magnetic permeability with additional dielectric loss.
ArXiv, 2021
Liquid level control is very important in industrial field, where the liquid level is required, a... more Liquid level control is very important in industrial field, where the liquid level is required, and to prevent overflows. The coupled-tank is a common system in industrial control processes. The system consists of two tanks connected together and the liquid flows between them. Tanks contain an inlet and outlet for each tank. The main principle of controlling this system is to maintain a constant level of liquid in both tanks when there are an inflow and outflow of liquid in each tank. To control liquid level in the coupled tank system, the mathematical model of the system had been derived and evaluated as a form of linear model. The mathematical model of coupled tank was developed to apply to both conventional and fuzzy control systems where the dynamic behavior of the system was considered. When the system had been designed the corresponding model was implemented in simulation by using Matlab and Simulink tools.
ArXiv, 2021
Breast cancer is the most common cancer in the world and the most prevalent cause of death among ... more Breast cancer is the most common cancer in the world and the most prevalent cause of death among women worldwide. Nevertheless, it is also one of the most treatable malignancies if detected early. In this paper, a deep convolutional neural network-based algorithm is proposed to aid in accurately identifying breast cancer from ultrasonic images. In this algorithm, several neural networks are fused in a parallel architecture to perform the classification process and the voting criteria are applied in the final classification decision between the candidate object classes where the output of each neural network is representing a single vote. Several experiments were conducted on the breast ultrasound dataset consisting of 537 Benign, 360 malignant, and 133 normal images. These experiments show an optimistic result and a capability of the proposed model to outperform many state-of-the-art algorithms on several measures. Using k-fold cross-validation and a bagging classifier ensemble, we ...
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
In this work, we theoretically investigate the possibility of optical spin to orbital angular mom... more In this work, we theoretically investigate the possibility of optical spin to orbital angular momentum conversion under tight focusing using 4Pi microscopic system. When the incident beam is a vertically polarized vortex beams, by analysis of the polarization states that are associated with the SAM density, we observe spin to orbital localized conversion in the focal vector beam. We further investigate the effect of altering the sign and value of the orbital angular momentum topological charge in the incident vortex beam on the focused beam.
NAECON 2021 - IEEE National Aerospace and Electronics Conference, 2021
Typically, DC energy sources such as photovoltaic and energy storage systems are connected to the... more Typically, DC energy sources such as photovoltaic and energy storage systems are connected to the microgrid through parallel inverters. In order to achieve a balanced power-sharing between these inverters, a proper control strategy is required. In this paper, droop control technique is utilized for a robust operation of two parallel inverters implemented with Metal-Oxide Semiconductor Filed Effect Transistor (MOSFET). The droop controller is implemented in the dq reference frame with the Sinusoidal Pulse Width Modulation (SPWM) being adapted as the switching technique. The droop controller is combined of three control loops: power control loop, voltage control loop and current control loop. All of the control loops are represented by the proportional and integral (PI) controller. The complete structure of the two parallel inverters-based Microgrid with droop controller is presented herein as a basis to derive a mathematical model for the proposed system and the control strategy. The performance of the proposed controller is tested through MATLAB/SIMULINK simulation. The simulation results show that a smooth and robust power-sharing is achieved with a slight variation in frequency and voltage.
Imaging and Applied Optics Congress, 2020
Results obtained for Fresnel coefficients corresponding to a magnetic achiral/chiral interface un... more Results obtained for Fresnel coefficients corresponding to a magnetic achiral/chiral interface under different incident angles and permittivity/permeability ratios, are extended to examine the transmitted amplitude profile of a 2D image/transparency. Both uniform and Gaussian- profile incident beams are considered.
Frontiers in Optics / Laser Science, 2020
Recent work involving image transmission across a magnetic achiral/chiral interface by use of Fre... more Recent work involving image transmission across a magnetic achiral/chiral interface by use of Fresnel coefficients under different incident angles and permittivity/permeability ratios is extended to include dispersive chiral dielectrics with uniform and Gaussian-profile incident beams.
Frontiers in Optics + Laser Science APS/DLS, 2019
2018 9th International Renewable Energy Congress (IREC), 2018
Increasing energy demand led to shifting the focus to the use of the renewable and sustainable en... more Increasing energy demand led to shifting the focus to the use of the renewable and sustainable energy sources. Microgrids (MGs), mainly inverter based, is gaining more importance as they can accommodate various types of renewable energy effectively. Their control is one of the most challenging research areas. In the last few years, many control strategies have been developed. In this paper, the control strategies for AC Microgrids based on hierarchical structures are introduced in different aspects. The control strategies in AC microgrid can be classified into three layers: firstly inner and outer control layer that controls the output current and manages the output active and reactive power of renewable energy sources (RESs), secondly, power sharing control layer that adjusts the amplitude and frequency of the voltage reference values and provides these reference values to inner and outer loops, finally supervisory control layer that restores voltage and frequency with controls the output active and reactive power between utility grid and MG, this control layer can be classified depending on operating mode into two levels: 1. MG supervisory control level or secondary control level, 2. Grid supervisory control level or tertiary level.
Wind Engineering, 2018
Typically, it is desired to operate the wind turbine at the maximum power point. However, in smal... more Typically, it is desired to operate the wind turbine at the maximum power point. However, in small wind turbines which have a storage system integrated with them, harvesting as much energy as possible is more crucial. This may be achieved by reducing the cut-in speed while maximizing the mechanical power. These two goals may be achieved by optimizing the turbine blades. In this article, the turbine blades are optimized using improved blade element momentum theory including Viterna-Corrigan stall model with the objective to yield low cut-in speed and high power level. Using the blade element momentum analysis, the power coefficient curves as functions of tip-speed ratio at various range of wind speeds are obtained for the optimized turbine. Using MATLAB/Simulink tool, a wind energy system, which consists of a wind turbine, permanent magnet synchronous generator and a resistive load, is simulated. The curves obtained from the blade element momentum analysis are used to emulate the win...
The environmental problem of global warming along with the desire to achieve sustainable and rela... more The environmental problem of global warming along with the desire to achieve sustainable and relatively cheap source of energy have motivated many research in the area of renewable energy. Wind energy resource is considered as one of the most promising and rapidly growing compared to other renewable energy resources. In this paper, a practical design of a horizontal wind turbine is implemented. The turbine is mainly composed of turbine blades, a gear box, a DC generator, and electrical controller. These components are designed experimentally in the lab. The main advantages of this system is that it has relatively low cost, operate at low speed at about 2m/s, and it can be easily controlled. It is concluded that such a small-scale turbine may be used to provide the required energy to small DC loads such as communication towers especially in areas that encounter frequent power outage.