scispace - formally typeset
Search or ask a question
Author

Ninet M. A. El-Rahman

Bio: Ninet M. A. El-Rahman is an academic researcher. The author has contributed to research in topics: Spacecraft & Electric power system. The author has an hindex of 4, co-authored 9 publications receiving 45 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: The results shows that a good agreement between MATLAB and VHDL and a fast and flexible feed forward NN which is capable of dealing with floating point arithmetic operations; minimum number of CLB slices; and good speed of performance is shown.
Abstract: Automation of generating hardware description language code from neural networks models can highly decrease time of implementation those networks into a digital devices, thus significant money savings. To implement the neural network into hardware designer, it is required to translate generated model into device structure. VHDL language is used to describe those networks into hardware. VHDL code has been proposed to implement ANNs as well as to present simulation results with floating point arithmetic of the earth station and the satellite power systems using ModelSim ® PE 6.6 simulator tool. Integration between MATLAB ® and VHDL is used to save execution time of computation. The results shows that a good agreement between MATLAB and VHDL and a fast/flexible feed forward NN which is capable of dealing with floating point arithmetic operations; minimum number of CLB slices; and good speed of performance. FPGA synthesis results are obtained with view RTL schematic and technology schematic from Xilinix tool. Minimum number of utilized resources is obtained by using Xilinix VERTIX5.

17 citations

Proceedings ArticleDOI
02 Sep 2010
TL;DR: In this article, a forced circulation solar water heating system for supplying hot water at a required temperature for an aquaculture system is presented, the main component of the system is flat plate collector, storage tank, and auxiliary heater.
Abstract: The most wide spread thermal use of solar energy, has been for water heating system, which have been commercialized in many countries in the world. This paper presents a model of a forced circulation solar water heating system for supplying a hot water at a required temperature for an aquaculture system. The main component of the system is flat plate collector, storage tank, and auxiliary heater. The optimization problem is carried out using genetic algorithm, which is one of the modern optimization techniques because of their evolutionary nature it can handle any kind of objective function and constraints. Genetic algorithm don't have mathematical requirements about the optimization problem, also it is very effective at performing a global search (in probability), and provide a great flexibility. The optimal design of flat plate collector area using genetic algorithm are used to optimize the objective function considering the constraints required for the system. As the genetic algorithm is a discrete optimization tool the number of variables in principle is free of choice. The economic analysis of such system is evaluated with the life cycle cost method. The collector area is equal to 63 m2, at this value the solar fraction reached to 98%which is very high value. Also sensitivity analysis to solar radiation variation, air temperature variation, and interest rate has been carried out.

15 citations

Journal ArticleDOI
TL;DR: In this paper, an Artificial Neural Network (ANN) based model has been developed for the optimum operation of the spacecraft power system in low earth orbit (LEO) using a back propagation with Levenberg-Marquardt algorithm.

9 citations

Journal ArticleDOI
TL;DR: In this article, the authors deal with simulation and optimal sizing of the earth station power system using HOMER software to determine the optimum system operation with respect to the total net present cost and levelized cost of energy (COE).
Abstract: Satellite earth stations which located in remote areas are one of many applications powered by the renewable energy sources. Ground system consists of ground station and control centers working together to support the spacecraft and the data user. Earth station consists of major subsystems, transmitter, receiver, antenna, tracking equipment, terrestrial interface equipment and power supply. Power subsystem is an important part that required for supplying the earth station with electrical power to continue communicating with its remote sensing satellite. This paper deals with simulation and optimal sizing of earth station power system using HOMER software. A combination of two energy sources (solar, and wind) to provide a continuous electric power production is used to determine the optimum system operation. Three system configurations are compared with respect to the total net present cost (NPC) and levelized cost of energy (COE). Also, economical study will be analyzed for energy demand and sensitivity analysis will be performed.

4 citations

Journal Article
TL;DR: In this article, an introduction of ANN and FPGA technique is briefly shown and the implementation of multi-layer NN using lookup table LUT reduces the resource utilization for implementation and time for execution.
Abstract: Designing and implementing intelligent systems has become a crucial factor for the innovation and development of better products of space technologies. A neural network is a parallel system, capable of resolving paradigms that linear computing cannot. Field programmable gate array (FPGA) is a digital device that owns reprogrammable properties and robust flexibility. For the neural network based instrument prototype in real time application, conventional specific VLSI neural chip design suffers the limitation in time and cost. With low precision artificial neural network design, FPGAs have higher speed and smaller size for real time application than the VLSI and DSP chips. So, many researchers have made great efforts on the realization of neural network (NN) using FPGA technique. In this paper, an introduction of ANN and FPGA technique are briefly shown. Also, Hardware Description Language (VHDL) code has been proposed to implement ANNs as well as to present simulation results with floating point arithmetic. Synthesis results for ANN controller are developed using Precision RTL. Proposed VHDL implementation creates a flexible, fast method and high degree of parallelism for implementing ANN. The implementation of multi-layer NN using lookup table LUT reduces the resource utilization for implementation and time for execution.

2 citations


Cited by
More filters
Journal ArticleDOI
Deyin Ma1, Yanchun Liang1, Xiaoshe Zhao1, Renchu Guan1, Xiaohu Shi1 
TL;DR: A novel Multi-BP expert system (MBPES) based method for power system fault diagnosis is proposed and Experimental results show that MBPES obtains higher accuracy than two commonly used methods.

81 citations

Journal ArticleDOI
01 Jan 2016-Energy
TL;DR: In this paper, an in-depth exergetic analysis of a double-pass/glazed v-corrugated plate solar air heater based on exergy loss terms was performed.

61 citations

26 Oct 2015
TL;DR: In this article, the effect of temperature and irradiance variations on the different solar cell parameters are studied, in order to estimate their performance under various conditions, and the efficiency of solar module is directly related with the solar parameter and therefore solar parameter changes and affects the efficiency.
Abstract: Energy which comes from natural resources such as sunlight, wind, rain, geothermal heat etc. is called renewable energy. Renewable energy is very important because the non-renewable energy such as petrol, diesel, and fossil fuels are limited. Solar energy is the most easily available source of energy. Most important it is nonconventional source of energy because it is non-polluting, clean etc. The influences of temperature and irradiance variations on the different solar cell parameters are studied. It is useful to understand the effect of temperature and irradiance on the solar cell and module performance, in order to estimate their performance under various conditions. The efficiency of solar module is directly related with the solar parameter and therefore solar parameter changes and affects the efficiency of solar module.

49 citations

Journal ArticleDOI
TL;DR: In this article, a photovoltaic/thermal (PVT) system is utilized in order to meet the electrical and thermal demand using solar energy in Khuznin, city in Qazvin Province, Iran.

30 citations