Self-driving cars, which guide themselves and perform operations by sensing their environment wit... more Self-driving cars, which guide themselves and perform operations by sensing their environment without human intervention, rely on sensors, actuators, complex algorithms, machine-learning systems and powerful processors to execute software. Their benefits include reducing accidents – including those caused by human errors such as drink-driving or using mobile phones, both of which are major causes of road carnage. A major drawback is that these vehicles are vulnerable to hacking because they are connected to the Internet. Manufacturers have developed an array of security mechanisms to shield these automobiles from unauthorised access, yet hackers continue to develop methods of bypassing their security layers.
2020 6th Conference on Data Science and Machine Learning Applications (CDMA), 2020
Internet of Things (IoT) growth is expected to reach phenomenal levels of diverse adoption and de... more Internet of Things (IoT) growth is expected to reach phenomenal levels of diverse adoption and deployment amongst multiple industries. This ranges from financial, communication, transport, health and general consumer sectors. The expected burst of IoT deployment will introduce significant cyber security challenges, specifically in the area of configuration management. Blockchain technology is continuously evolving beyond the use as financial currency, and is proving to be a feasible solution for distributed record keeping and validation. The special characteristics of Blockchain technology introduces a new domain of IoT secure configuration and decentralized management, while taking into consideration the challenging constraints imposed by IoT devices efficient and low-power design. In this paper we try to identify an effective approach to manage and control security IoT device configurations by adopting a Blockchain technology.
The presence of a high ripple in the inductor current of a DC-DC converter in a photovoltaic conv... more The presence of a high ripple in the inductor current of a DC-DC converter in a photovoltaic converter chain leads to a considerable decrease in the energy efficiency of the converter. To solve this problem, we consider a current-mode control and for economic reasons we used a single inductor current sensor with a low-pass filter. The purpose of the low-pass filter is to minimize the effect of ripple in the inductor current by taking only the DC component of the signal at the output of the sensor for tracking the maximum power point. The objective of this paper is therefore to study the stability of the photovoltaic system as a function of the filter frequency while maintaining a good power level. First, we propose a general modeling of the whole system by linearizing the PV around the maximum power point. Floquet theory is used to determine analytically the stability of the overall system. The fourth-order Runge–Kutta method is used to plot bifurcation diagrams and Lyapunov exponen...
The need for energy is always increasing as civilization evolves. Renewable energy sources are cr... more The need for energy is always increasing as civilization evolves. Renewable energy sources are crucial for meeting energy demands as conventional fuel resources are slowly running out. Researchers are working to extract the most amount of power possible from renewable resources. Numerous resources are in demand, including solar, wind, biomass, tidal, and geothermal resources. Solar energy outperformed all the aforementioned resources in terms of efficiency, cleanliness, and pollution freeness. Intermittency, however, is the resource’s main shortcoming. Maximum power point tracking algorithm (MPPT) integration is required for the system to achieve continuous optimum power by overcoming the feature of intermittency. However, generating electrical energy from solar energy has presented a significant problem in ensuring the output power’s quality within a reasonable range. Total harmonic distortion (THD), a phenomenon, may have an impact on the power quality. Depending on the properties...
This paper deals with the modeling and theoretical study of an average-current-mode-controlled ph... more This paper deals with the modeling and theoretical study of an average-current-mode-controlled photovoltaic power conversion chain. It should be noted that current mode control is a superior scheme for controlling DC–DC power electronic converters for photovoltaic applications. Bifurcation diagrams, largest Lyapunov exponents, Floquet theory, and time series are used to study the dynamics of the system. The theoretical results show the existence of subharmonic oscillations and period-1 oscillations in the system. The results of the numerical simulations showed that when the battery voltage at the output of the converter is fixed and ramp amplitude is taken as a control parameter, the photovoltaic power system exhibits the phenomenon of period doubling leading to chaotic dynamics. Furthermore, bifurcation diagrams showed that both the critical value of ramp amplitude for the occurrence of border collision bifurcation and the critical value of ramp amplitude for the occurrence of peri...
The number of children with mental health problems is ever-growing; as a result, nearly 850,000 c... more The number of children with mental health problems is ever-growing; as a result, nearly 850,000 children in the UK are believed to have clinically significant problems, and only a quarter show evidence of mental illness. Family members often have a hard time dealing with children with mental health problems. As a result, digital mental health interventions are becoming popular for people seeking professional mental health services. Previous studies in this area have also shown that parents who are divorced or working away from home struggle to maintain contact with their children. This lack of communication between the parents and their children can worsen the children’s mental health conditions and prevent early diagnosis. Human-centred design thinking is applied step by step in this paper to provide an intuitive understanding of the design process. Five stages of the design thinking process were examined to follow a correct path. The results were promising, and the feedback receiv...
Universities face a constant challenge when distributing students and allocating them to their re... more Universities face a constant challenge when distributing students and allocating them to their required classes, especially for a large mass of students. Generating feasible timetables is a strenuous task that requires plenty of resources, which makes it impractical to take student preferences into consideration during the process. Timetabling and scheduling problems are proven to be NP-hard due to their complex nature and large search spaces. A genetic algorithm (GA) that assigns students to their classes based on their preferences is proposed as a solution to this problem and is implemented in this article. The GA’s performance is enhanced by applying different metaheuristic concepts and by tailoring the genetic operators to the given problem. The quality of the solutions generated is boosted further with the unique repair and improvement functions that were implemented in conjunction with the genetic algorithm. The success of the GA was evaluated by using different datasets of va...
... in Series Parallel Networks Brahim Chaourar Riyadh College of Technology, PO Box 42826, Riyad... more ... in Series Parallel Networks Brahim Chaourar Riyadh College of Technology, PO Box 42826, Riyadh 11551, Saudi Arabia Correspondence address: PO Box 287574, Riyadh 11323, Saudi Arabia bchaourar@hotmail.com ... in Series Parallel Networks Brahim Chaourar ...
2008 Second UKSIM European Symposium on Computer Modeling and Simulation, 2008
In this paper we present a max flow multipath routing algorithm that is designed to reduce latenc... more In this paper we present a max flow multipath routing algorithm that is designed to reduce latency, provide high throughput and balance traffic load. The max flow multipath algorithm is based on a Ford-Fulkerson algorithm. It consists of determining a set of disjoint paths that are loop free with maximum flow, then splitting network traffic among those paths on a round robin fashion. Through simulation we show that our algorithm performs well than a multi shortest path.
The task of Quality of Service (QoS) routing is to find a path in the network that satisfies cert... more The task of Quality of Service (QoS) routing is to find a path in the network that satisfies certain constraints on metrics such as bandwidth, while also achieving overall network resource efficiency. The focus of this paper is on a polynomial algorithm to find a feasible path that ...
In this paper we present a max flow multipath routing algorithm (MFMP) that is designed to reduce... more In this paper we present a max flow multipath routing algorithm (MFMP) that is designed to reduce latency, provide high throughput and balance traffic load. The max flow multipath algorithm is based on a Ford-Fulkerson algorithm. It consists of determining a ...
International Journal of Intelligent Engineering and Systems
The Internet and its users are in continual growth. With it grows the number of organized crimes ... more The Internet and its users are in continual growth. With it grows the number of organized crimes on the Internet and the potential for individuals to carry out illegal activities. These criminals have gained more awareness of private browsing facilities, and many have found a haven in privacy designed browsers that cover up their tracks and shield their nefarious actions. The development of these privacy features has proven to be a challenge for digital forensic investigators. They strive to perform a thorough analysis of web browsers to collect artefacts relating to illegal activity to be presented as evidence to the court of law and used to convict criminals. “Brave” browser is one of the most recent and fastest-growing private browsers that, up to this point, has not been studied in-depth, and its privacy preservation functionality remains unclear. In this paper, we studied Brave’s private browsing mode, examined its privacy-preserving and forensic data acquisition, and outlined ...
Self-driving cars, which guide themselves and perform operations by sensing their environment wit... more Self-driving cars, which guide themselves and perform operations by sensing their environment without human intervention, rely on sensors, actuators, complex algorithms, machine-learning systems and powerful processors to execute software. Their benefits include reducing accidents – including those caused by human errors such as drink-driving or using mobile phones, both of which are major causes of road carnage. A major drawback is that these vehicles are vulnerable to hacking because they are connected to the Internet. Manufacturers have developed an array of security mechanisms to shield these automobiles from unauthorised access, yet hackers continue to develop methods of bypassing their security layers.
2020 6th Conference on Data Science and Machine Learning Applications (CDMA), 2020
Internet of Things (IoT) growth is expected to reach phenomenal levels of diverse adoption and de... more Internet of Things (IoT) growth is expected to reach phenomenal levels of diverse adoption and deployment amongst multiple industries. This ranges from financial, communication, transport, health and general consumer sectors. The expected burst of IoT deployment will introduce significant cyber security challenges, specifically in the area of configuration management. Blockchain technology is continuously evolving beyond the use as financial currency, and is proving to be a feasible solution for distributed record keeping and validation. The special characteristics of Blockchain technology introduces a new domain of IoT secure configuration and decentralized management, while taking into consideration the challenging constraints imposed by IoT devices efficient and low-power design. In this paper we try to identify an effective approach to manage and control security IoT device configurations by adopting a Blockchain technology.
The presence of a high ripple in the inductor current of a DC-DC converter in a photovoltaic conv... more The presence of a high ripple in the inductor current of a DC-DC converter in a photovoltaic converter chain leads to a considerable decrease in the energy efficiency of the converter. To solve this problem, we consider a current-mode control and for economic reasons we used a single inductor current sensor with a low-pass filter. The purpose of the low-pass filter is to minimize the effect of ripple in the inductor current by taking only the DC component of the signal at the output of the sensor for tracking the maximum power point. The objective of this paper is therefore to study the stability of the photovoltaic system as a function of the filter frequency while maintaining a good power level. First, we propose a general modeling of the whole system by linearizing the PV around the maximum power point. Floquet theory is used to determine analytically the stability of the overall system. The fourth-order Runge–Kutta method is used to plot bifurcation diagrams and Lyapunov exponen...
The need for energy is always increasing as civilization evolves. Renewable energy sources are cr... more The need for energy is always increasing as civilization evolves. Renewable energy sources are crucial for meeting energy demands as conventional fuel resources are slowly running out. Researchers are working to extract the most amount of power possible from renewable resources. Numerous resources are in demand, including solar, wind, biomass, tidal, and geothermal resources. Solar energy outperformed all the aforementioned resources in terms of efficiency, cleanliness, and pollution freeness. Intermittency, however, is the resource’s main shortcoming. Maximum power point tracking algorithm (MPPT) integration is required for the system to achieve continuous optimum power by overcoming the feature of intermittency. However, generating electrical energy from solar energy has presented a significant problem in ensuring the output power’s quality within a reasonable range. Total harmonic distortion (THD), a phenomenon, may have an impact on the power quality. Depending on the properties...
This paper deals with the modeling and theoretical study of an average-current-mode-controlled ph... more This paper deals with the modeling and theoretical study of an average-current-mode-controlled photovoltaic power conversion chain. It should be noted that current mode control is a superior scheme for controlling DC–DC power electronic converters for photovoltaic applications. Bifurcation diagrams, largest Lyapunov exponents, Floquet theory, and time series are used to study the dynamics of the system. The theoretical results show the existence of subharmonic oscillations and period-1 oscillations in the system. The results of the numerical simulations showed that when the battery voltage at the output of the converter is fixed and ramp amplitude is taken as a control parameter, the photovoltaic power system exhibits the phenomenon of period doubling leading to chaotic dynamics. Furthermore, bifurcation diagrams showed that both the critical value of ramp amplitude for the occurrence of border collision bifurcation and the critical value of ramp amplitude for the occurrence of peri...
The number of children with mental health problems is ever-growing; as a result, nearly 850,000 c... more The number of children with mental health problems is ever-growing; as a result, nearly 850,000 children in the UK are believed to have clinically significant problems, and only a quarter show evidence of mental illness. Family members often have a hard time dealing with children with mental health problems. As a result, digital mental health interventions are becoming popular for people seeking professional mental health services. Previous studies in this area have also shown that parents who are divorced or working away from home struggle to maintain contact with their children. This lack of communication between the parents and their children can worsen the children’s mental health conditions and prevent early diagnosis. Human-centred design thinking is applied step by step in this paper to provide an intuitive understanding of the design process. Five stages of the design thinking process were examined to follow a correct path. The results were promising, and the feedback receiv...
Universities face a constant challenge when distributing students and allocating them to their re... more Universities face a constant challenge when distributing students and allocating them to their required classes, especially for a large mass of students. Generating feasible timetables is a strenuous task that requires plenty of resources, which makes it impractical to take student preferences into consideration during the process. Timetabling and scheduling problems are proven to be NP-hard due to their complex nature and large search spaces. A genetic algorithm (GA) that assigns students to their classes based on their preferences is proposed as a solution to this problem and is implemented in this article. The GA’s performance is enhanced by applying different metaheuristic concepts and by tailoring the genetic operators to the given problem. The quality of the solutions generated is boosted further with the unique repair and improvement functions that were implemented in conjunction with the genetic algorithm. The success of the GA was evaluated by using different datasets of va...
... in Series Parallel Networks Brahim Chaourar Riyadh College of Technology, PO Box 42826, Riyad... more ... in Series Parallel Networks Brahim Chaourar Riyadh College of Technology, PO Box 42826, Riyadh 11551, Saudi Arabia Correspondence address: PO Box 287574, Riyadh 11323, Saudi Arabia bchaourar@hotmail.com ... in Series Parallel Networks Brahim Chaourar ...
2008 Second UKSIM European Symposium on Computer Modeling and Simulation, 2008
In this paper we present a max flow multipath routing algorithm that is designed to reduce latenc... more In this paper we present a max flow multipath routing algorithm that is designed to reduce latency, provide high throughput and balance traffic load. The max flow multipath algorithm is based on a Ford-Fulkerson algorithm. It consists of determining a set of disjoint paths that are loop free with maximum flow, then splitting network traffic among those paths on a round robin fashion. Through simulation we show that our algorithm performs well than a multi shortest path.
The task of Quality of Service (QoS) routing is to find a path in the network that satisfies cert... more The task of Quality of Service (QoS) routing is to find a path in the network that satisfies certain constraints on metrics such as bandwidth, while also achieving overall network resource efficiency. The focus of this paper is on a polynomial algorithm to find a feasible path that ...
In this paper we present a max flow multipath routing algorithm (MFMP) that is designed to reduce... more In this paper we present a max flow multipath routing algorithm (MFMP) that is designed to reduce latency, provide high throughput and balance traffic load. The max flow multipath algorithm is based on a Ford-Fulkerson algorithm. It consists of determining a ...
International Journal of Intelligent Engineering and Systems
The Internet and its users are in continual growth. With it grows the number of organized crimes ... more The Internet and its users are in continual growth. With it grows the number of organized crimes on the Internet and the potential for individuals to carry out illegal activities. These criminals have gained more awareness of private browsing facilities, and many have found a haven in privacy designed browsers that cover up their tracks and shield their nefarious actions. The development of these privacy features has proven to be a challenge for digital forensic investigators. They strive to perform a thorough analysis of web browsers to collect artefacts relating to illegal activity to be presented as evidence to the court of law and used to convict criminals. “Brave” browser is one of the most recent and fastest-growing private browsers that, up to this point, has not been studied in-depth, and its privacy preservation functionality remains unclear. In this paper, we studied Brave’s private browsing mode, examined its privacy-preserving and forensic data acquisition, and outlined ...
In Wireless Sensor Networks (WSN), sensor node energy is important for maximizing the network lif... more In Wireless Sensor Networks (WSN), sensor node energy is important for maximizing the network lifetime as well as performing sensing and communicating data. Most existing optimization solution for enhancing network lifetime considers only one objective, while the WSNs problems are by nature multi-objectives optimization one. To address this lack of representation, we propose a Multi-Objective Protocol (MOP) that uses Mixed Integer Linear Programming (MILP) optimization approach for increasing network lifetime and residual energy. Sets of MILP are solved locally within each set of nodes covering a specific target. Thus, the energy is saved locally within same coverage nodes. The objectives considered in this paper include maximizing network residual energy and connectivity for neighbor nodes. The nodes that are put inactive, are those which are mostly used during routing, and having less connectivity with their neighbors by solving locally MILP at each round. From the simulation results we showed that, our proposed model provides efficient and accurate decisions for network lifetime and increasing residual energy compared to other Multi-objective models.
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