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uthman baroudi

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West Pomeranian University of Technology, Szczecin

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Papers by uthman baroudi

Stand Alone Smart Bolt for e-Maintenance

International Journal of Engineering and Technology, 2012

The present paper introduces a new configuration of a smart bolt capable of sensing the variation... more The present paper introduces a new configuration of a smart bolt capable of sensing the variation of its axial tension. The information is processed in a built-in board and a wireless alarm is sent to a receiver to inform about the health of the bolts at any time. Both way communications is allowed within a designed network of bolts in a plant. For the sake of less cumbrousness, the whole board is space optimized with battery less trials.

Smart Bolts Monitoring Using Wireless Sensor Network: Implementation and Performance Evaluation

International Journal of Distributed Sensor Networks, 2014

Structural and industrial environments use hundreds to thousands of bolts to hold parts together.... more Structural and industrial environments use hundreds to thousands of bolts to hold parts together. For most mechanical systems, the bolts are critical components because they are subject to axial tension triggering various failures; for example, compromised screw threadsand/or vibration caused untightening. Severe damages can result injury of personnel, equipment damage, and even loss of life. Typically, monitoring mechanical tension of the bolts is visually performed with red dot bolts or manually inspected, but this process is expensive in terms of effort, time, and money; additionally, perhaps the accessibility of the bolt itself is very difficult. Changing this tedious monitoring process to automated, quick, and precise process is our concern in this work. Nowadays, wireless sensor networks (WSN) have wide range of applications especially in surveillance and monitoring systems. In this paper, we propose an efficient and power-aware technique to monitor bolted joints using wireles...

Recovering From a Node Failure in Wireless Sensor-Actor Networks With Minimal Topology Changes

IEEE Transactions on Vehicular Technology, 2013

In wireless sensor-actor networks, sensors probe their surroundings and forward their data to act... more In wireless sensor-actor networks, sensors probe their surroundings and forward their data to actor nodes. Actors collaboratively respond to achieve predefined application mission. Since actors have to coordinate their operation, it is necessary to maintain a strongly connected network topology at all times. Moreover, the length of the inter-actor communication paths may be constrained to meet latency requirements. However, a failure of an actor may cause the network to partition into disjoint blocks and would, thus, violate such a connectivity goal. One of the effective recovery methodologies is to autonomously reposition a subset of the actor nodes to restore connectivity. Contemporary recovery schemes either impose high node relocation overhead or extend some of the inter-actor data paths. This paper overcomes these shortcomings and presents a Least-Disruptive topology Repair (LeDiR) algorithm. LeDiR relies on the local view of a node about the network to devise a recovery plan that relocates the least number of nodes and ensures that no path between any pair of nodes is extended. LeDiR is a localized and distributed algorithm that leverages existing route discovery activities in the network and imposes no additional prefailure communication overhead. The performance of LeDiR is analyzed mathematically and validated via extensive simulation experiments.

Recovering From a Node Failure in Wireless Sensor-Actor Networks With Minimal Topology Changes

IEEE Transactions on Vehicular Technology, 2013

In wireless sensor-actor networks, sensors probe their surroundings and forward their data to act... more In wireless sensor-actor networks, sensors probe their surroundings and forward their data to actor nodes. Actors collaboratively respond to achieve predefined application mission. Since actors have to coordinate their operation, it is necessary to maintain a strongly connected network topology at all times. Moreover, the length of the inter-actor communication paths may be constrained to meet latency requirements. However, a failure of an actor may cause the network to partition into disjoint blocks and would, thus, violate such a connectivity goal. One of the effective recovery methodologies is to autonomously reposition a subset of the actor nodes to restore connectivity. Contemporary recovery schemes either impose high node relocation overhead or extend some of the inter-actor data paths. This paper overcomes these shortcomings and presents a Least-Disruptive topology Repair (LeDiR) algorithm. LeDiR relies on the local view of a node about the network to devise a recovery plan that relocates the least number of nodes and ensures that no path between any pair of nodes is extended. LeDiR is a localized and distributed algorithm that leverages existing route discovery activities in the network and imposes no additional prefailure communication overhead. The performance of LeDiR is analyzed mathematically and validated via extensive simulation experiments.

Placement of access points in wireless local area networks

Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly, 2009

An Optimal Cross-Layer Scheduling for Periodic WSN Applications

Procedia Computer Science, 2013

This paper investigates an optimal cross-layer joint routing and scheduling problem for WSN with ... more This paper investigates an optimal cross-layer joint routing and scheduling problem for WSN with periodic data collection. The problem is formulated as an Integer Linear Program (ILP) model such that a joint scheduling and routing is developed to maximize network lifetime. An ILP model for Energy-Efficient Distributed Schedule-Based (EEDS) protocol is proposed. The main objective of the ILP model is to build an energy efficient joint routing tree and TDMA scheduling framework considering the EEDS assumptions. The ILP model is solved for different network configurations. The results obtained by the ILP model are compared with the EEDS protocol simulation results.

Tactile Routing for Location Privacy Preservation in Wireless Sensor Networks: A Game Theoretic Approach

Sensors

Location Privacy Preservation (LPP) in Wireless Sensor Networks (WSNs) during the era of the Inte... more Location Privacy Preservation (LPP) in Wireless Sensor Networks (WSNs) during the era of the Internet of things and smart systems is a critical element in the success of WSNs. LPP in WSN can be stated as: given a WSN with an adversary aiming to unravel the location of critical nodes of a WSN, the goal of the WSN manager is to enshroud the location of the critical nodes via routing and/or encryption mechanisms. Typical research in the LPP of WSN routing involves developing and/or estimating the performance of a fixed routing protocol under a given attack mechanism. Motivated by advancements in network softwarization, in this work, we propose an approach where the WSN manager as well as the WSN adversary can deploy multiple routing and attack mechanisms, respectively. Initially, the proposed approach is formulated as a repeated two-player zero-sum game. The formulation is further extended to handle multiple objectives and incomplete information in the game matrix. In this work, the mu...

Internet of things for healthcare monitoring applications based on RFID clustering scheme

Wireless Networks, 2020

COVID-19 surprised the whole world by its quick and sudden spread. Coronavirus pushes all communi... more COVID-19 surprised the whole world by its quick and sudden spread. Coronavirus pushes all community sectors: government, industry, academia, and nonprofit organizations to take forward steps to stop and control this pandemic. It is evident that IT-based solutions are urgent. This study is a small step in this direction, where health information is monitored and collected continuously. In this work, we build a network of smart nodes where each node comprises a Radio-Frequency Identification (RFID) tag, reduced function RFID reader (RFRR), and sensors. The smart nodes are grouped in clusters, which are constructed periodically. The RFRR reader of the clusterhead collects data from its members, and once it is close to the primary reader, it conveys its data and so on. This approach reduces the primary RFID reader's burden by receiving data from the clusterheads only instead of reading every tag when they pass by its vicinity. Besides, this mechanism reduces the channel access congestion; thus, it reduces the interference significantly. Furthermore, to protect the exchanged data from potential attacks, two levels of security algorithms, including an AES 128 bit with hashing, have been implemented. The proposed scheme has been validated via mathematical modeling using Integer programming, simulation, and prototype experimentation. The proposed technique shows low data delivery losses and a significant drop in transmission delay compared to contemporary approaches.

Implementation of Rank Based Sleep Scheduling (RBSS) Protocol for WSNs in a Fixed Grid Topology

Procedia Computer Science, 2013

One of the most significant challenges in wide-scale Wireless Sensor Networks (WSNs) is to achiev... more One of the most significant challenges in wide-scale Wireless Sensor Networks (WSNs) is to achieve energy efficiency in order to increase their lifetime and ensuring responsiveness. A very widely applied approach in this regard is to overload the region with numerous low-cost sensing devices that can communicate with each other wirelessly and coordinate amongst themselves in developing schedules for being asleep or active. The literature has numerous research works in this regard which aim to develop efficient sleep scheduling schemes. In this paper, we present an implementation of a grid-topology based cooperative Rank Based Sleep Scheduling (RBSS) protocol in which the nodes of every cell coordinate in a distributive manner, the decision making process of selecting the nodes that should stay active, while others sleep. The proposed protocol guarantees the WSN connectivity as well as the required coverage. Finally, we implement RBSS on a small scale grid using TelosB motes.

Efficient Energy Harvesting in Wireless Sensor Networks of Smart Grid

ArXiv, 2019

Smart grids are becoming ubiquitous in recent time. With the progress of automation in this arena... more Smart grids are becoming ubiquitous in recent time. With the progress of automation in this arena, it needs to be diagnosed for better performance and less failures. There are several options for doing that but we have seen from the past research that using Wireless Sensor Network (WSN) as the diagnosis framework would be the most promising option due to its diverse benefits. Several challenges such as effect of noise, lower speed, selective node replacement, complexity of logistics, and limited battery lifetime arise while using WSN as the framework. Limited battery lifetime has become one of the most significant issues to focus on to get rid of it. This article provides a model for replenishing the battery charge of the sensor nodes of wireless sensor network. We will use the model for sensor battery recharging in an efficient way so that no nodes become out of service after a while. We will be using mobile charger for this purpose. So, there may be some scope for improving the re...

Multi-robot Task Allocation System: Fuzzy Auction-Based and Adaptive Multi-threshold Approaches

SN Comput. Sci., 2021

Auction-based and threshold-based are the prevalent approaches for multi-robot distributed task a... more Auction-based and threshold-based are the prevalent approaches for multi-robot distributed task allocation problem. We study the performance of these two approaches under a multi-objective dynamic task allocation scenario. The fuzzy inference system (FIS) is used in the auction-based approach to convert the objectives into a representative bid value. Experiments reveal that FIS auction-based outperforms the adaptive threshold-based approach in terms of load balancing. In contrast, the adaptive threshold-based approach produces better results in terms of traveled distance. Moreover, both approaches can achieve the same quality satisfaction objective.

A Framework for Autonomous Robot Deployment with Perfect Demand Satisfaction using Virtual Forces

ArXiv, 2019

In many applications, robots autonomous deployment is preferable and sometimes it is the only aff... more In many applications, robots autonomous deployment is preferable and sometimes it is the only affordable solution. To address this issue, virtual force (VF) is one of the prominent approaches to performing multirobot deployment autonomously. However, most of the existing VF-based approaches consider only a uniform deployment to maximize the covered area while ignoring the criticality of specific locations during the deployment process. To overcome these limitations, we present a framework for autonomously deploy robots or vehicles using virtual force. The framework is composed of two stages. In the first stage, a two-hop Cooperative Virtual Force based Robots Deployment (Two-hop COVER) is employed where a cooperative relation between robots and neighboring landmarks is established to satisfy mission requirements. The second stage complements the first stage and ensures perfect demand satisfaction by utilizing the Trace Fingerprint technique which collected traces while each robot tr...

Optimal node repositioning for tolerating node failure in wireless sensor actor network

2010 25th Biennial Symposium on Communications, 2010

Wireless sensor and actor networks (WSANs) usually operate in harsh environment and thus become s... more Wireless sensor and actor networks (WSANs) usually operate in harsh environment and thus become susceptible to breakage in connectivity due to the failure of one or multiple actor nodes. The positions of some of these actors are critical to the sustainability of inter-node communications. Specifically, some node failures may cause the network to partition into disjoint segments. Given that WSANS

NS-2 enhancements for detailed HSDPA simulations

… of the 3rd International Conference on …, 2008

The Enhanced UMTS Radio Access Network Extensions (EURANE) provided UMTS and HSDPA support in the... more

Adaptive admission/congestion control policy for hybrid TDMA/MC-CDMA integrated networks with guaranteed QoS

10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003, 2003

Future networks are expected to have the ability to accommodate variety of users, each with its o... more Future networks are expected to have the ability to accommodate variety of users, each with its own transmission characteristics and QoS requirements to be maintained. Compatible multiaccess system should provide the means to control (i.e. admission/congestion) the flow of traffic and at the same time maintain the QoS requirements. This paper investigates the performance of a novel measurement-based admission/congestion control policy over a hybrid TDMA/MC-CDMA platform. The practicality and several performance measures of the new system shall be analyzed analytically under a wide range of expected traffic characteristics (bit rate, transmission activities, etc.) for the future wireless networks. The adaptive admission/congestion control policy has effectively maintained the required QoS. It is worth to emphasize here that our proposed admission/congestion control polices apply preventive admission control as well as reactive congestion control.

Literature Review of MAC, Routing and Cross Layer Design Protocols for WSN

Wireless Sensor Networks and Energy …, 2012

The impact of sensor node distribution on routing protocols performance: A comparitive study

Proc. of the 11th IEEE Int. Conference on Trust, Security and Privacy in Computing and Communications, TrustCom-2012 - 11th IEEE Int. Conference on Ubiquitous Computing and Communications, IUCC-2012, 2012

The contemporary routing algorithms were built and tested under the assumption of uniformly distr... more The contemporary routing algorithms were built and tested under the assumption of uniformly distributed sensor nodes. However, this assumption is not always true. In some industrial applications and due to the scope of the ongoing monitoring process, sensors are installed and condensed in some area, while they are sparse in other areas. In this work, we investigate the impact of sensor node deployment distributions on the performance of different flavors of LEACH routing algorithm. Further, we study the impact of base station location, and different data loads. A comparison between LEACH and LEACH-C is conducted. The results show that different sensor distributions leads to significant differences in network performance. Furthermore, it shows that LEACH-C out performs LEACH almost in all distributions variations and base station locations.

Cooperative Smartphone Tracking System: Software Design and Implementation

SN Computer Science

Mobile applications have been increasingly adopted in monitoring and tracking systems such as hea... more Mobile applications have been increasingly adopted in monitoring and tracking systems such as health tracking systems for elderly and chronic patients. Due to the ubiquitous nature of smartphones, using smartphones in such tracking systems would be time and cost-effective. However, the limited battery capacity in smartphones could cause an interruption in reporting the tracking information, especially when users spend a long time without recharging batteries. Continuous tracking could be critically important, especially for the elderly and patients with serious illnesses. In this paper, we develop a mobile application for Android smartphones that report the location and health information cooperatively using the CEET clustering protocol. On the server-side, we exploited the Google Firebase real database that receives the users' tracking information and can notify the data changes within milliseconds. We present a performance evaluation of the system through real experiments using the developed application. The results show the outstanding performance of the proposed approach in reducing the tracking energy (by around 55%). The developed app does not require any modification neither to the manufacturing specifications of the smartphones nor to the established wireless environment. The user just needs to install the app to his/ her smartphones using apk file or from the Google play.

A two-stage framework for fair autonomous robot deployment using virtual forces

Transportation Research Part A: Policy and Practice

Ambient self-powered cluster-based wireless sensor networks for industry 4.0 applications

Soft Computing

Stand Alone Smart Bolt for e-Maintenance

International Journal of Engineering and Technology, 2012

The present paper introduces a new configuration of a smart bolt capable of sensing the variation... more The present paper introduces a new configuration of a smart bolt capable of sensing the variation of its axial tension. The information is processed in a built-in board and a wireless alarm is sent to a receiver to inform about the health of the bolts at any time. Both way communications is allowed within a designed network of bolts in a plant. For the sake of less cumbrousness, the whole board is space optimized with battery less trials.

Smart Bolts Monitoring Using Wireless Sensor Network: Implementation and Performance Evaluation

International Journal of Distributed Sensor Networks, 2014

Structural and industrial environments use hundreds to thousands of bolts to hold parts together.... more Structural and industrial environments use hundreds to thousands of bolts to hold parts together. For most mechanical systems, the bolts are critical components because they are subject to axial tension triggering various failures; for example, compromised screw threadsand/or vibration caused untightening. Severe damages can result injury of personnel, equipment damage, and even loss of life. Typically, monitoring mechanical tension of the bolts is visually performed with red dot bolts or manually inspected, but this process is expensive in terms of effort, time, and money; additionally, perhaps the accessibility of the bolt itself is very difficult. Changing this tedious monitoring process to automated, quick, and precise process is our concern in this work. Nowadays, wireless sensor networks (WSN) have wide range of applications especially in surveillance and monitoring systems. In this paper, we propose an efficient and power-aware technique to monitor bolted joints using wireles...

Recovering From a Node Failure in Wireless Sensor-Actor Networks With Minimal Topology Changes

IEEE Transactions on Vehicular Technology, 2013

In wireless sensor-actor networks, sensors probe their surroundings and forward their data to act... more In wireless sensor-actor networks, sensors probe their surroundings and forward their data to actor nodes. Actors collaboratively respond to achieve predefined application mission. Since actors have to coordinate their operation, it is necessary to maintain a strongly connected network topology at all times. Moreover, the length of the inter-actor communication paths may be constrained to meet latency requirements. However, a failure of an actor may cause the network to partition into disjoint blocks and would, thus, violate such a connectivity goal. One of the effective recovery methodologies is to autonomously reposition a subset of the actor nodes to restore connectivity. Contemporary recovery schemes either impose high node relocation overhead or extend some of the inter-actor data paths. This paper overcomes these shortcomings and presents a Least-Disruptive topology Repair (LeDiR) algorithm. LeDiR relies on the local view of a node about the network to devise a recovery plan that relocates the least number of nodes and ensures that no path between any pair of nodes is extended. LeDiR is a localized and distributed algorithm that leverages existing route discovery activities in the network and imposes no additional prefailure communication overhead. The performance of LeDiR is analyzed mathematically and validated via extensive simulation experiments.

Recovering From a Node Failure in Wireless Sensor-Actor Networks With Minimal Topology Changes

IEEE Transactions on Vehicular Technology, 2013

In wireless sensor-actor networks, sensors probe their surroundings and forward their data to act... more In wireless sensor-actor networks, sensors probe their surroundings and forward their data to actor nodes. Actors collaboratively respond to achieve predefined application mission. Since actors have to coordinate their operation, it is necessary to maintain a strongly connected network topology at all times. Moreover, the length of the inter-actor communication paths may be constrained to meet latency requirements. However, a failure of an actor may cause the network to partition into disjoint blocks and would, thus, violate such a connectivity goal. One of the effective recovery methodologies is to autonomously reposition a subset of the actor nodes to restore connectivity. Contemporary recovery schemes either impose high node relocation overhead or extend some of the inter-actor data paths. This paper overcomes these shortcomings and presents a Least-Disruptive topology Repair (LeDiR) algorithm. LeDiR relies on the local view of a node about the network to devise a recovery plan that relocates the least number of nodes and ensures that no path between any pair of nodes is extended. LeDiR is a localized and distributed algorithm that leverages existing route discovery activities in the network and imposes no additional prefailure communication overhead. The performance of LeDiR is analyzed mathematically and validated via extensive simulation experiments.

Placement of access points in wireless local area networks

Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly, 2009

An Optimal Cross-Layer Scheduling for Periodic WSN Applications

Procedia Computer Science, 2013

This paper investigates an optimal cross-layer joint routing and scheduling problem for WSN with ... more This paper investigates an optimal cross-layer joint routing and scheduling problem for WSN with periodic data collection. The problem is formulated as an Integer Linear Program (ILP) model such that a joint scheduling and routing is developed to maximize network lifetime. An ILP model for Energy-Efficient Distributed Schedule-Based (EEDS) protocol is proposed. The main objective of the ILP model is to build an energy efficient joint routing tree and TDMA scheduling framework considering the EEDS assumptions. The ILP model is solved for different network configurations. The results obtained by the ILP model are compared with the EEDS protocol simulation results.

Tactile Routing for Location Privacy Preservation in Wireless Sensor Networks: A Game Theoretic Approach

Sensors

Location Privacy Preservation (LPP) in Wireless Sensor Networks (WSNs) during the era of the Inte... more Location Privacy Preservation (LPP) in Wireless Sensor Networks (WSNs) during the era of the Internet of things and smart systems is a critical element in the success of WSNs. LPP in WSN can be stated as: given a WSN with an adversary aiming to unravel the location of critical nodes of a WSN, the goal of the WSN manager is to enshroud the location of the critical nodes via routing and/or encryption mechanisms. Typical research in the LPP of WSN routing involves developing and/or estimating the performance of a fixed routing protocol under a given attack mechanism. Motivated by advancements in network softwarization, in this work, we propose an approach where the WSN manager as well as the WSN adversary can deploy multiple routing and attack mechanisms, respectively. Initially, the proposed approach is formulated as a repeated two-player zero-sum game. The formulation is further extended to handle multiple objectives and incomplete information in the game matrix. In this work, the mu...

Internet of things for healthcare monitoring applications based on RFID clustering scheme

Wireless Networks, 2020

COVID-19 surprised the whole world by its quick and sudden spread. Coronavirus pushes all communi... more COVID-19 surprised the whole world by its quick and sudden spread. Coronavirus pushes all community sectors: government, industry, academia, and nonprofit organizations to take forward steps to stop and control this pandemic. It is evident that IT-based solutions are urgent. This study is a small step in this direction, where health information is monitored and collected continuously. In this work, we build a network of smart nodes where each node comprises a Radio-Frequency Identification (RFID) tag, reduced function RFID reader (RFRR), and sensors. The smart nodes are grouped in clusters, which are constructed periodically. The RFRR reader of the clusterhead collects data from its members, and once it is close to the primary reader, it conveys its data and so on. This approach reduces the primary RFID reader's burden by receiving data from the clusterheads only instead of reading every tag when they pass by its vicinity. Besides, this mechanism reduces the channel access congestion; thus, it reduces the interference significantly. Furthermore, to protect the exchanged data from potential attacks, two levels of security algorithms, including an AES 128 bit with hashing, have been implemented. The proposed scheme has been validated via mathematical modeling using Integer programming, simulation, and prototype experimentation. The proposed technique shows low data delivery losses and a significant drop in transmission delay compared to contemporary approaches.

Implementation of Rank Based Sleep Scheduling (RBSS) Protocol for WSNs in a Fixed Grid Topology

Procedia Computer Science, 2013

One of the most significant challenges in wide-scale Wireless Sensor Networks (WSNs) is to achiev... more One of the most significant challenges in wide-scale Wireless Sensor Networks (WSNs) is to achieve energy efficiency in order to increase their lifetime and ensuring responsiveness. A very widely applied approach in this regard is to overload the region with numerous low-cost sensing devices that can communicate with each other wirelessly and coordinate amongst themselves in developing schedules for being asleep or active. The literature has numerous research works in this regard which aim to develop efficient sleep scheduling schemes. In this paper, we present an implementation of a grid-topology based cooperative Rank Based Sleep Scheduling (RBSS) protocol in which the nodes of every cell coordinate in a distributive manner, the decision making process of selecting the nodes that should stay active, while others sleep. The proposed protocol guarantees the WSN connectivity as well as the required coverage. Finally, we implement RBSS on a small scale grid using TelosB motes.

Efficient Energy Harvesting in Wireless Sensor Networks of Smart Grid

ArXiv, 2019

Smart grids are becoming ubiquitous in recent time. With the progress of automation in this arena... more Smart grids are becoming ubiquitous in recent time. With the progress of automation in this arena, it needs to be diagnosed for better performance and less failures. There are several options for doing that but we have seen from the past research that using Wireless Sensor Network (WSN) as the diagnosis framework would be the most promising option due to its diverse benefits. Several challenges such as effect of noise, lower speed, selective node replacement, complexity of logistics, and limited battery lifetime arise while using WSN as the framework. Limited battery lifetime has become one of the most significant issues to focus on to get rid of it. This article provides a model for replenishing the battery charge of the sensor nodes of wireless sensor network. We will use the model for sensor battery recharging in an efficient way so that no nodes become out of service after a while. We will be using mobile charger for this purpose. So, there may be some scope for improving the re...

Multi-robot Task Allocation System: Fuzzy Auction-Based and Adaptive Multi-threshold Approaches

SN Comput. Sci., 2021

Auction-based and threshold-based are the prevalent approaches for multi-robot distributed task a... more Auction-based and threshold-based are the prevalent approaches for multi-robot distributed task allocation problem. We study the performance of these two approaches under a multi-objective dynamic task allocation scenario. The fuzzy inference system (FIS) is used in the auction-based approach to convert the objectives into a representative bid value. Experiments reveal that FIS auction-based outperforms the adaptive threshold-based approach in terms of load balancing. In contrast, the adaptive threshold-based approach produces better results in terms of traveled distance. Moreover, both approaches can achieve the same quality satisfaction objective.

A Framework for Autonomous Robot Deployment with Perfect Demand Satisfaction using Virtual Forces

ArXiv, 2019

In many applications, robots autonomous deployment is preferable and sometimes it is the only aff... more In many applications, robots autonomous deployment is preferable and sometimes it is the only affordable solution. To address this issue, virtual force (VF) is one of the prominent approaches to performing multirobot deployment autonomously. However, most of the existing VF-based approaches consider only a uniform deployment to maximize the covered area while ignoring the criticality of specific locations during the deployment process. To overcome these limitations, we present a framework for autonomously deploy robots or vehicles using virtual force. The framework is composed of two stages. In the first stage, a two-hop Cooperative Virtual Force based Robots Deployment (Two-hop COVER) is employed where a cooperative relation between robots and neighboring landmarks is established to satisfy mission requirements. The second stage complements the first stage and ensures perfect demand satisfaction by utilizing the Trace Fingerprint technique which collected traces while each robot tr...

Optimal node repositioning for tolerating node failure in wireless sensor actor network

2010 25th Biennial Symposium on Communications, 2010

Wireless sensor and actor networks (WSANs) usually operate in harsh environment and thus become s... more Wireless sensor and actor networks (WSANs) usually operate in harsh environment and thus become susceptible to breakage in connectivity due to the failure of one or multiple actor nodes. The positions of some of these actors are critical to the sustainability of inter-node communications. Specifically, some node failures may cause the network to partition into disjoint segments. Given that WSANS

NS-2 enhancements for detailed HSDPA simulations

… of the 3rd International Conference on …, 2008

The Enhanced UMTS Radio Access Network Extensions (EURANE) provided UMTS and HSDPA support in the... more

Adaptive admission/congestion control policy for hybrid TDMA/MC-CDMA integrated networks with guaranteed QoS

10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003, 2003

Future networks are expected to have the ability to accommodate variety of users, each with its o... more Future networks are expected to have the ability to accommodate variety of users, each with its own transmission characteristics and QoS requirements to be maintained. Compatible multiaccess system should provide the means to control (i.e. admission/congestion) the flow of traffic and at the same time maintain the QoS requirements. This paper investigates the performance of a novel measurement-based admission/congestion control policy over a hybrid TDMA/MC-CDMA platform. The practicality and several performance measures of the new system shall be analyzed analytically under a wide range of expected traffic characteristics (bit rate, transmission activities, etc.) for the future wireless networks. The adaptive admission/congestion control policy has effectively maintained the required QoS. It is worth to emphasize here that our proposed admission/congestion control polices apply preventive admission control as well as reactive congestion control.

Literature Review of MAC, Routing and Cross Layer Design Protocols for WSN

Wireless Sensor Networks and Energy …, 2012

The impact of sensor node distribution on routing protocols performance: A comparitive study

Proc. of the 11th IEEE Int. Conference on Trust, Security and Privacy in Computing and Communications, TrustCom-2012 - 11th IEEE Int. Conference on Ubiquitous Computing and Communications, IUCC-2012, 2012

The contemporary routing algorithms were built and tested under the assumption of uniformly distr... more The contemporary routing algorithms were built and tested under the assumption of uniformly distributed sensor nodes. However, this assumption is not always true. In some industrial applications and due to the scope of the ongoing monitoring process, sensors are installed and condensed in some area, while they are sparse in other areas. In this work, we investigate the impact of sensor node deployment distributions on the performance of different flavors of LEACH routing algorithm. Further, we study the impact of base station location, and different data loads. A comparison between LEACH and LEACH-C is conducted. The results show that different sensor distributions leads to significant differences in network performance. Furthermore, it shows that LEACH-C out performs LEACH almost in all distributions variations and base station locations.

Cooperative Smartphone Tracking System: Software Design and Implementation

SN Computer Science

Mobile applications have been increasingly adopted in monitoring and tracking systems such as hea... more Mobile applications have been increasingly adopted in monitoring and tracking systems such as health tracking systems for elderly and chronic patients. Due to the ubiquitous nature of smartphones, using smartphones in such tracking systems would be time and cost-effective. However, the limited battery capacity in smartphones could cause an interruption in reporting the tracking information, especially when users spend a long time without recharging batteries. Continuous tracking could be critically important, especially for the elderly and patients with serious illnesses. In this paper, we develop a mobile application for Android smartphones that report the location and health information cooperatively using the CEET clustering protocol. On the server-side, we exploited the Google Firebase real database that receives the users' tracking information and can notify the data changes within milliseconds. We present a performance evaluation of the system through real experiments using the developed application. The results show the outstanding performance of the proposed approach in reducing the tracking energy (by around 55%). The developed app does not require any modification neither to the manufacturing specifications of the smartphones nor to the established wireless environment. The user just needs to install the app to his/ her smartphones using apk file or from the Google play.

A two-stage framework for fair autonomous robot deployment using virtual forces

Transportation Research Part A: Policy and Practice

Ambient self-powered cluster-based wireless sensor networks for industry 4.0 applications

Soft Computing