Emmanuel Tonye - Profile on Academia.edu (original) (raw)

Papers by Emmanuel Tonye

Revue Française de Photogrammétrie et de Télédétection

La pression démographique et l'urbanisation croissante entraînent la concentration des popula... more La pression démographique et l'urbanisation croissante entraînent la concentration des populations dans des espaces plus ou moins réduits. La pression foncière engendrée conjuguée à la destruction du couvert végétal entraînent la dégradation des sols. Ces conséquences préoccupent les collectivités territoriales, les élus locaux, et les aménageurs du territoire. Ainsi il importe d'évaluer l'aire d'une classe d'occupation du sol dans le futur et son influence sur les autres classes d'occupation du sol tout en précisant sa localisation et sa composition. C'est dans cette optique que s'inscrit la présente étude qui a pour objectif de réaliser l'étude de la dynamique de l'occupation du sol de 1986 à 2003 du secteur d'étude, situé au Centre-Ouest de la Côte d'Ivoire afin de faire une prévision du mode d'occupation du sol pour l'horizon 2020. L'étude des changements réalisés s'appuie sur des simulations et fait appel à la modé...

HADEM-MACS: a hybrid approach for detection and extraction of objects in movement by multimedia autonomous computer systems

International Journal of Computational Vision and Robotics

In this paper we model the problem of base station migration as a question of optimization by gen... more In this paper we model the problem of base station migration as a question of optimization by genetic algorithms in order to minimize a target goal which is a weighted function of network coverage, traffic, energy consumption and the cost of the infrastructure. The model takes as input an area of interest, a set of existing sites, a maximum number of sites, and outputs the optimal number and locations required for sites, including existing sites and new sites. The goal here is to minimize the cost of deploying the new network by reusing existing network sites as much as possible while ensuring that traffic coverage is good and energy consumption is reduced. We proposed and implemented an algorithm to solve the optimization problem formulated based on a model of distribution of mobile stations and the locations of existing sites as well as new sites.

A primary concern of a wireless sensor network (WSN) is to gather data from the immediate environ... more A primary concern of a wireless sensor network (WSN) is to gather data from the immediate environment of it sensors while minimizing the use of limited network and computational resources. Several studies have focused on how to efficiently store and process sensed data in WSN. Generally, the appropriate method to store sensed data depends on the application for which the WSN was deployed. No matter the application, data collection appears to be a primary function of a WSN. The execution of this function must be coordinated and effective in order to provide WSN with current security standards such as privacy, data integrity and end entity authentication between communicating peers. In this paper, we propose an efficient authentication-based security scheme for data retrieval in WSN. This security scheme combines zero-knowledge proofs (ZKP) and pre-shared key method to provide secured and authenticated communication during data retrieval by a mobile sink in WSN. The security mechanism...

Annales des Télécommunications, 1985

multip61es planaires simples en rdgime multimodal. A partir du modble du guide dquivalent, on ddv... more multip61es planaires simples en rdgime multimodal. A partir du modble du guide dquivalent, on ddveloppe en sdrie de modes le champ dlectrique dans les guides d' alimentation et on l'identifie aux diffdrents accbs, aux valeurs obtenues d partir de la fonction de Green de la jonction. On aboutit ainsi d une formulation trbs simple qui prend en rompte les modes d'ordre supdrieur avec un gain apprdciable en temps de calcuL La mdthode peut ~tre dtendue par segmentation aux jonctions de forme quelconque.

Temporal complexity, bit error rate (BER) testing, and second order statistics like autocorrelati... more Temporal complexity, bit error rate (BER) testing, and second order statistics like autocorrelation, level crossing rate (LCR) and average fade duration (AFD) play a significant role in fading channel modelling. These parameters describe the channel behaviour, the quality of the fading and the performance of the communication system. The present work focussed on the frequency non selective Rayleigh fading channel and on the filtered white Gaussian noise (FWGN) modelling method. Various Doppler spectra were evaluated through the above mentioned metrics using a Monte Carlo or a semi analytical method. The BER test was performed on two types of LTE (Long Term Evolution) single path channels: the ETU (Extended Typical Urban) channel and the EVA (Extended Vehicular A) channel. The transmitted signal was either M-PSK (M-ary Phase Shift Keying) or M-QAM (M-ary Quadrature Amplitude Modulation) modulated. Matlab was used as simulation tool. The objective being to discriminate and detect the ...

International Journal of Computer Network and Information Security, 2020

The success of the mission assigned to a Wireless Sensor Network (WSN) depends heavily on the coo... more The success of the mission assigned to a Wireless Sensor Network (WSN) depends heavily on the cooperation between the nodes of this network. Indeed, given the vulnerability of wireless sensor networks to attack, some entities may engage in malicious behavior aimed at undermining the proper functioning of the network. As a result, the selection of reliable nodes for task execution becomes a necessity for the network. To improve the cooperation and security of wireless sensor networks, the use of Trust Management Systems (TMS) is increasingly recommended due to their low resource consumption. The various existing trust management systems differ in their methods of estimating trust value. The existing ones are very rigid and not very accurate. In this paper, we propose a robust and accurate method (RATES) to compute direct and indirect trust between the network nodes. In RATES model, to compute the direct trust, we improve the Bayesian formula by applying the chaining of trust values, ...

International Journal of Computer Network and Information Security, 2020

This paper introduces PREFAP, an approach to solve the multi-sensor patrolling problem in unknown... more This paper introduces PREFAP, an approach to solve the multi-sensor patrolling problem in unknown environment. The multi-sensor patrolling problem consists in moving a set of sensors on a pre-set territory such that each part of this territory is visited by the sensor agents as often as possible. Eachsensor has a communicational radius and a sensory radius. indeed, optimal patrol can only be achieved if the duration between two visits of the same area of the environment is as minimal as possible. This time between two visits is called idleness. Thus, an effective patrol technique must make it possible to minimize idleness in the environment.That is why after a deep analysis of the existing resolution’s approaches, we propose a hybrid approach of resolution with three components: perception-reaction, field of strength and learning. In absence of obstacles, the perception-reaction component gives to the sensors a purely reactive behavior, as a function of their local perceptions, whic...

International Journal of Image, Graphics and Signal Processing, 2019

Background subtraction plays an important role in intelligent video surveillance since it is one ... more Background subtraction plays an important role in intelligent video surveillance since it is one of the most used tools in motion detection. If scientific progress has enabled to develop sophisticated equipment for this task, algorithms used should be improved as well. For the past decade a background subtraction technique called ViBE is gaining the field. However, the original algorithm has two main drawbacks. The first one is ghost phenomenon which appears if the initial frame contains a moving object or in the case of a sudden change in the background situations. Secondly it fails to perform well in complicated background. This paper presents an efficient background subtraction approach based on ViBE to solve these two problems. It is based on an adaptive radius to deal with complex background, on cumulative mean and pixel counting mechanism to quickly eliminate the ghost phenomenon and to adapt to sudden change in the background model.

International Journal of Engineering Technology Sciences, Mar 2, 2013

In this paper, we are conducting an evaluation the compression of electromyographic signals (EMG)... more In this paper, we are conducting an evaluation the compression of electromyographic signals (EMG) through of standard modified JPEG 2000 called 1D. We illustrate that; this method can also be used to compress EMG signals. The technique consists of cutting the signal into small segments or micro vectors. The EMG signal compression through this method aims at solving the problems of transmission and optimizes storage. A comparison of the results obtained with those of the literature shows a net improvement. The results obtained on real signals are presented in terms of the objective criteria of evaluating performance.

Nouvelle méthode de restauration d'images phtotographiques en couleur dégradées par le bruit de la transformation RGB->YcbCr

Propagation models are essential tools for planning and optimization in mobile radio networks. Th... more Propagation models are essential tools for planning and optimization in mobile radio networks. They enable the evaluation of the signal strength received by a mobile terminal with respect to a distance of a given base station. And through a link budget, it is possible to calculate the coverage radius of the cell and plan the number of cells required to cover a given area. This paper takes into account the standard model K factor then uses a genetic algorithm to develop a propagation model adapted to the physical environment of the city of Yaoundé, Cameroon. Radio measurements were made on the CDMA2000 1X-EVDO network of the operator CAMTEL. Calculating the root mean squared error (RMSE) between the actual measurement data and radio data from the prediction model developed allows validation of the results. A comparative study is made between the value of the RMSE obtained by the new model and those obtained by the standard model of OKUMURA HATA. We can conclude that the new model is ...

The current inter-domain routing protocol, Border Gateway Protocol (BGP4), has evolved over the p... more The current inter-domain routing protocol, Border Gateway Protocol (BGP4), has evolved over the past decade and now constitutes a critical part of the Internet infrastructure. Despite impressive progress in characterizing the various ills of the Border Gateway Protocol (BGP), many problems remain unsolved, and the behavior of the routing system is still poorly understood. The BGP routing protocol is used to interconnect the various Internet operators together. BGP enables ASes to make local decisions based on private routing policies, and forms global routes from these local decisions. At a very high level, the execution of BGP requires ASes to continuously make independent greedy route selections, based on their local preferences over routes, and announce these choices to all neighboring ASes. The inconsistencies of these policies can cause route instabilities also called oscillations. In this article, we discuss the different theoretical models of bgp protocol fighting against int...

IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001

SAR images are corrupted by multiplicative noise (speckle) which limits the performance of the cl... more SAR images are corrupted by multiplicative noise (speckle) which limits the performance of the classical coder/decoder (codec) in the spatial domain. Our objective is to give an evaluation of the efficiency of a multiwavelet transform coding algorithm. We use the additional degree of freedom offered by multiwavelets to fine tune the number of vanishing moments and the approximation order of ours basis functions. Once the multiwavelet transform is performed, we apply an optimal bit allocation scheme on the subbands data using a set of Vector Quantizers. The quantization of the high frequencies multiwavelets coefficients may be though of as a hard thresholding algorithm. A measure of the equivalent number of looks is performed in the reconstructed SAR image in order to evaluate the impact of the codec in the noise reduction process. We compare our method with classical algorithm (baseline scalar wavelet transform followed by an optimal scalar quantization). The codec achieves comparable SNR, but performs surprising speckle noise reduction. Some results are presented with ERS-PRI images of Cameroon which can be compressed at ¤ ¦ ¥ § © while still remaining of sufficient quality for visual interpretation, segmentation and land use monitoring.

International Journal of Computer Applications, 2015

This paper describes the organizational modeling of the Ant Colony Optimization (ACO). It present... more This paper describes the organizational modeling of the Ant Colony Optimization (ACO). It presents a modeling approach of the ACO based on Holonic Multi-Agent paradigm named HMAS (Holonic Multi-Agent Systems). The approach of modeling used is organizational and it uses four basic concepts: Capacity, Role, Interaction and Organization (CRIO). The Traditional modeling techniques fail to capture interactions between loosely coupled aspects of a complex system. However, the organizational model of the ACO has highlighted the different roles that can occur in such optimization device. The solving approach highlights two fundamental concepts from behavioral intensification and diversification. Since, it is difficult to distinguish an intensification from a diversification behavior, though these two trends are identifiable in the organizational model of the proposed ACO, a single role can combine the roles Intensif y and Diversif y. So, a M anager role is identified and is responsible for the coordination of research by the colonies, and the management of the pheromone memory.

IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477)

A new method is proposed in this paper to detect oil slick signatures in oceanographic SAR images... more A new method is proposed in this paper to detect oil slick signatures in oceanographic SAR images. This method is based on directional behavioural oil slick in the sea surface. Therefore, directional hysteresis thresholding responses are first computed in order to bring to the fore dark spots, and increase pixels connexity in each Freeman direction. Those responses are then merged with the help of a Context Independent Constant Behaviour (CICB) operator. The proposed method is tested on ERS SAR amplitude images of Mediterranean and Atlantic seas. The obtained results are promising and show a good qualitative detection.

Cartography - A Tool for Spatial Analysis, 2012

International Journal of Applied Information Systems, 2013

This paper describes the design of a system for wildfire monitoring incorporating wireless sensor... more This paper describes the design of a system for wildfire monitoring incorporating wireless sensors. A wireless sensor network (WSN) is a complex system. In complex systems, multiple aspects interact and influence each other. A vast number of entities are present in the system. Traditional modelling and simulation techniques fail to capture interactions between loosely coupled aspects of a complex system. This paper also describes a modelling approach of the mobile WSN based on Holonic Multi-Agent paradigm (Holonic Multi-Agent Systems (HMAS)). The holonic model has the characteristics of scalability and robustness. The approach of modelling used is organizational and it uses four basic concepts: Role, Interaction, Organization and Capacity. This paper mainly presents the formulation problem of fire detection. An application is made to the patrolling task and the detection and avoidance of the obstacles during moving of the mobile sensor.

International Journal of Computer Applications, 2014

Patrolling an environment involves a team of agents whose goal usually consists in continuously v... more Patrolling an environment involves a team of agents whose goal usually consists in continuously visiting its most relevant areas as frequently as possible. Hence, patrolling consists in continuously visiting relevant areas of an environment, in order to efficiently surpervise or control it. The Ant Colony Optimization (ACO) is adopted as the solution approach that efficiently solves the multiagent patrolling problem. Two stratagies are employed: all agents are located on the same node at the initial time, and the agents are dispersed over the graph, they start to patrol from their new locations. This paper mainly describes the formulation problem of event detection by a multi-objective approach, an ACO and multi-agent approach are used to model and simulate the detection of events. Different parameters are evaluated in order to minimize them. The minimization ofWorst Idleness, Computer Science Wireless

Europe Oceans 2005, 2005

The authors present a new method to characterise and discriminate oil slicks and some look-alikes... more The authors present a new method to characterise and discriminate oil slicks and some look-alikes in ERS-2 SAR images according only to the observed sea roughness, to reduce oil spill detection and monitoring systems cost. It exploit sea wave spectrum images from the multiscale analysis based on a modified morphological pyramid. Many backscatter characteristics extracted at each level, depended on object and background features are normalized to make its spectral scales be identical. Twenty objects (spot and border) backscatter features have been measured. Eleven sea surface slicks types have been analysed, namely oil, atmospheric instability, wind front, unstable air-mass, current front, falling land wind, large gravity waves, low wind area, natural slicks, swell visible and wind sheltered area. The results presented as smoothed basic profiles and textural spectra allow to tackle oil slicks supervised classification in new images. Oil slicks and current front are discriminated. But, some ambiguities of slicks discrimination in SAR images remain persistent.

Revue Française de Photogrammétrie et de Télédétection

La pression démographique et l'urbanisation croissante entraînent la concentration des popula... more La pression démographique et l'urbanisation croissante entraînent la concentration des populations dans des espaces plus ou moins réduits. La pression foncière engendrée conjuguée à la destruction du couvert végétal entraînent la dégradation des sols. Ces conséquences préoccupent les collectivités territoriales, les élus locaux, et les aménageurs du territoire. Ainsi il importe d'évaluer l'aire d'une classe d'occupation du sol dans le futur et son influence sur les autres classes d'occupation du sol tout en précisant sa localisation et sa composition. C'est dans cette optique que s'inscrit la présente étude qui a pour objectif de réaliser l'étude de la dynamique de l'occupation du sol de 1986 à 2003 du secteur d'étude, situé au Centre-Ouest de la Côte d'Ivoire afin de faire une prévision du mode d'occupation du sol pour l'horizon 2020. L'étude des changements réalisés s'appuie sur des simulations et fait appel à la modé...

HADEM-MACS: a hybrid approach for detection and extraction of objects in movement by multimedia autonomous computer systems

International Journal of Computational Vision and Robotics

In this paper we model the problem of base station migration as a question of optimization by gen... more In this paper we model the problem of base station migration as a question of optimization by genetic algorithms in order to minimize a target goal which is a weighted function of network coverage, traffic, energy consumption and the cost of the infrastructure. The model takes as input an area of interest, a set of existing sites, a maximum number of sites, and outputs the optimal number and locations required for sites, including existing sites and new sites. The goal here is to minimize the cost of deploying the new network by reusing existing network sites as much as possible while ensuring that traffic coverage is good and energy consumption is reduced. We proposed and implemented an algorithm to solve the optimization problem formulated based on a model of distribution of mobile stations and the locations of existing sites as well as new sites.

A primary concern of a wireless sensor network (WSN) is to gather data from the immediate environ... more A primary concern of a wireless sensor network (WSN) is to gather data from the immediate environment of it sensors while minimizing the use of limited network and computational resources. Several studies have focused on how to efficiently store and process sensed data in WSN. Generally, the appropriate method to store sensed data depends on the application for which the WSN was deployed. No matter the application, data collection appears to be a primary function of a WSN. The execution of this function must be coordinated and effective in order to provide WSN with current security standards such as privacy, data integrity and end entity authentication between communicating peers. In this paper, we propose an efficient authentication-based security scheme for data retrieval in WSN. This security scheme combines zero-knowledge proofs (ZKP) and pre-shared key method to provide secured and authenticated communication during data retrieval by a mobile sink in WSN. The security mechanism...

Annales des Télécommunications, 1985

multip61es planaires simples en rdgime multimodal. A partir du modble du guide dquivalent, on ddv... more multip61es planaires simples en rdgime multimodal. A partir du modble du guide dquivalent, on ddveloppe en sdrie de modes le champ dlectrique dans les guides d' alimentation et on l'identifie aux diffdrents accbs, aux valeurs obtenues d partir de la fonction de Green de la jonction. On aboutit ainsi d une formulation trbs simple qui prend en rompte les modes d'ordre supdrieur avec un gain apprdciable en temps de calcuL La mdthode peut ~tre dtendue par segmentation aux jonctions de forme quelconque.

Temporal complexity, bit error rate (BER) testing, and second order statistics like autocorrelati... more Temporal complexity, bit error rate (BER) testing, and second order statistics like autocorrelation, level crossing rate (LCR) and average fade duration (AFD) play a significant role in fading channel modelling. These parameters describe the channel behaviour, the quality of the fading and the performance of the communication system. The present work focussed on the frequency non selective Rayleigh fading channel and on the filtered white Gaussian noise (FWGN) modelling method. Various Doppler spectra were evaluated through the above mentioned metrics using a Monte Carlo or a semi analytical method. The BER test was performed on two types of LTE (Long Term Evolution) single path channels: the ETU (Extended Typical Urban) channel and the EVA (Extended Vehicular A) channel. The transmitted signal was either M-PSK (M-ary Phase Shift Keying) or M-QAM (M-ary Quadrature Amplitude Modulation) modulated. Matlab was used as simulation tool. The objective being to discriminate and detect the ...

International Journal of Computer Network and Information Security, 2020

The success of the mission assigned to a Wireless Sensor Network (WSN) depends heavily on the coo... more The success of the mission assigned to a Wireless Sensor Network (WSN) depends heavily on the cooperation between the nodes of this network. Indeed, given the vulnerability of wireless sensor networks to attack, some entities may engage in malicious behavior aimed at undermining the proper functioning of the network. As a result, the selection of reliable nodes for task execution becomes a necessity for the network. To improve the cooperation and security of wireless sensor networks, the use of Trust Management Systems (TMS) is increasingly recommended due to their low resource consumption. The various existing trust management systems differ in their methods of estimating trust value. The existing ones are very rigid and not very accurate. In this paper, we propose a robust and accurate method (RATES) to compute direct and indirect trust between the network nodes. In RATES model, to compute the direct trust, we improve the Bayesian formula by applying the chaining of trust values, ...

International Journal of Computer Network and Information Security, 2020

This paper introduces PREFAP, an approach to solve the multi-sensor patrolling problem in unknown... more This paper introduces PREFAP, an approach to solve the multi-sensor patrolling problem in unknown environment. The multi-sensor patrolling problem consists in moving a set of sensors on a pre-set territory such that each part of this territory is visited by the sensor agents as often as possible. Eachsensor has a communicational radius and a sensory radius. indeed, optimal patrol can only be achieved if the duration between two visits of the same area of the environment is as minimal as possible. This time between two visits is called idleness. Thus, an effective patrol technique must make it possible to minimize idleness in the environment.That is why after a deep analysis of the existing resolution’s approaches, we propose a hybrid approach of resolution with three components: perception-reaction, field of strength and learning. In absence of obstacles, the perception-reaction component gives to the sensors a purely reactive behavior, as a function of their local perceptions, whic...

International Journal of Image, Graphics and Signal Processing, 2019

Background subtraction plays an important role in intelligent video surveillance since it is one ... more Background subtraction plays an important role in intelligent video surveillance since it is one of the most used tools in motion detection. If scientific progress has enabled to develop sophisticated equipment for this task, algorithms used should be improved as well. For the past decade a background subtraction technique called ViBE is gaining the field. However, the original algorithm has two main drawbacks. The first one is ghost phenomenon which appears if the initial frame contains a moving object or in the case of a sudden change in the background situations. Secondly it fails to perform well in complicated background. This paper presents an efficient background subtraction approach based on ViBE to solve these two problems. It is based on an adaptive radius to deal with complex background, on cumulative mean and pixel counting mechanism to quickly eliminate the ghost phenomenon and to adapt to sudden change in the background model.

International Journal of Engineering Technology Sciences, Mar 2, 2013

In this paper, we are conducting an evaluation the compression of electromyographic signals (EMG)... more In this paper, we are conducting an evaluation the compression of electromyographic signals (EMG) through of standard modified JPEG 2000 called 1D. We illustrate that; this method can also be used to compress EMG signals. The technique consists of cutting the signal into small segments or micro vectors. The EMG signal compression through this method aims at solving the problems of transmission and optimizes storage. A comparison of the results obtained with those of the literature shows a net improvement. The results obtained on real signals are presented in terms of the objective criteria of evaluating performance.

Nouvelle méthode de restauration d'images phtotographiques en couleur dégradées par le bruit de la transformation RGB->YcbCr

Propagation models are essential tools for planning and optimization in mobile radio networks. Th... more Propagation models are essential tools for planning and optimization in mobile radio networks. They enable the evaluation of the signal strength received by a mobile terminal with respect to a distance of a given base station. And through a link budget, it is possible to calculate the coverage radius of the cell and plan the number of cells required to cover a given area. This paper takes into account the standard model K factor then uses a genetic algorithm to develop a propagation model adapted to the physical environment of the city of Yaoundé, Cameroon. Radio measurements were made on the CDMA2000 1X-EVDO network of the operator CAMTEL. Calculating the root mean squared error (RMSE) between the actual measurement data and radio data from the prediction model developed allows validation of the results. A comparative study is made between the value of the RMSE obtained by the new model and those obtained by the standard model of OKUMURA HATA. We can conclude that the new model is ...

The current inter-domain routing protocol, Border Gateway Protocol (BGP4), has evolved over the p... more The current inter-domain routing protocol, Border Gateway Protocol (BGP4), has evolved over the past decade and now constitutes a critical part of the Internet infrastructure. Despite impressive progress in characterizing the various ills of the Border Gateway Protocol (BGP), many problems remain unsolved, and the behavior of the routing system is still poorly understood. The BGP routing protocol is used to interconnect the various Internet operators together. BGP enables ASes to make local decisions based on private routing policies, and forms global routes from these local decisions. At a very high level, the execution of BGP requires ASes to continuously make independent greedy route selections, based on their local preferences over routes, and announce these choices to all neighboring ASes. The inconsistencies of these policies can cause route instabilities also called oscillations. In this article, we discuss the different theoretical models of bgp protocol fighting against int...

IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001

SAR images are corrupted by multiplicative noise (speckle) which limits the performance of the cl... more SAR images are corrupted by multiplicative noise (speckle) which limits the performance of the classical coder/decoder (codec) in the spatial domain. Our objective is to give an evaluation of the efficiency of a multiwavelet transform coding algorithm. We use the additional degree of freedom offered by multiwavelets to fine tune the number of vanishing moments and the approximation order of ours basis functions. Once the multiwavelet transform is performed, we apply an optimal bit allocation scheme on the subbands data using a set of Vector Quantizers. The quantization of the high frequencies multiwavelets coefficients may be though of as a hard thresholding algorithm. A measure of the equivalent number of looks is performed in the reconstructed SAR image in order to evaluate the impact of the codec in the noise reduction process. We compare our method with classical algorithm (baseline scalar wavelet transform followed by an optimal scalar quantization). The codec achieves comparable SNR, but performs surprising speckle noise reduction. Some results are presented with ERS-PRI images of Cameroon which can be compressed at ¤ ¦ ¥ § © while still remaining of sufficient quality for visual interpretation, segmentation and land use monitoring.

International Journal of Computer Applications, 2015

This paper describes the organizational modeling of the Ant Colony Optimization (ACO). It present... more This paper describes the organizational modeling of the Ant Colony Optimization (ACO). It presents a modeling approach of the ACO based on Holonic Multi-Agent paradigm named HMAS (Holonic Multi-Agent Systems). The approach of modeling used is organizational and it uses four basic concepts: Capacity, Role, Interaction and Organization (CRIO). The Traditional modeling techniques fail to capture interactions between loosely coupled aspects of a complex system. However, the organizational model of the ACO has highlighted the different roles that can occur in such optimization device. The solving approach highlights two fundamental concepts from behavioral intensification and diversification. Since, it is difficult to distinguish an intensification from a diversification behavior, though these two trends are identifiable in the organizational model of the proposed ACO, a single role can combine the roles Intensif y and Diversif y. So, a M anager role is identified and is responsible for the coordination of research by the colonies, and the management of the pheromone memory.

IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477)

A new method is proposed in this paper to detect oil slick signatures in oceanographic SAR images... more A new method is proposed in this paper to detect oil slick signatures in oceanographic SAR images. This method is based on directional behavioural oil slick in the sea surface. Therefore, directional hysteresis thresholding responses are first computed in order to bring to the fore dark spots, and increase pixels connexity in each Freeman direction. Those responses are then merged with the help of a Context Independent Constant Behaviour (CICB) operator. The proposed method is tested on ERS SAR amplitude images of Mediterranean and Atlantic seas. The obtained results are promising and show a good qualitative detection.

Cartography - A Tool for Spatial Analysis, 2012

International Journal of Applied Information Systems, 2013

This paper describes the design of a system for wildfire monitoring incorporating wireless sensor... more This paper describes the design of a system for wildfire monitoring incorporating wireless sensors. A wireless sensor network (WSN) is a complex system. In complex systems, multiple aspects interact and influence each other. A vast number of entities are present in the system. Traditional modelling and simulation techniques fail to capture interactions between loosely coupled aspects of a complex system. This paper also describes a modelling approach of the mobile WSN based on Holonic Multi-Agent paradigm (Holonic Multi-Agent Systems (HMAS)). The holonic model has the characteristics of scalability and robustness. The approach of modelling used is organizational and it uses four basic concepts: Role, Interaction, Organization and Capacity. This paper mainly presents the formulation problem of fire detection. An application is made to the patrolling task and the detection and avoidance of the obstacles during moving of the mobile sensor.

International Journal of Computer Applications, 2014

Patrolling an environment involves a team of agents whose goal usually consists in continuously v... more Patrolling an environment involves a team of agents whose goal usually consists in continuously visiting its most relevant areas as frequently as possible. Hence, patrolling consists in continuously visiting relevant areas of an environment, in order to efficiently surpervise or control it. The Ant Colony Optimization (ACO) is adopted as the solution approach that efficiently solves the multiagent patrolling problem. Two stratagies are employed: all agents are located on the same node at the initial time, and the agents are dispersed over the graph, they start to patrol from their new locations. This paper mainly describes the formulation problem of event detection by a multi-objective approach, an ACO and multi-agent approach are used to model and simulate the detection of events. Different parameters are evaluated in order to minimize them. The minimization ofWorst Idleness, Computer Science Wireless

Europe Oceans 2005, 2005

The authors present a new method to characterise and discriminate oil slicks and some look-alikes... more The authors present a new method to characterise and discriminate oil slicks and some look-alikes in ERS-2 SAR images according only to the observed sea roughness, to reduce oil spill detection and monitoring systems cost. It exploit sea wave spectrum images from the multiscale analysis based on a modified morphological pyramid. Many backscatter characteristics extracted at each level, depended on object and background features are normalized to make its spectral scales be identical. Twenty objects (spot and border) backscatter features have been measured. Eleven sea surface slicks types have been analysed, namely oil, atmospheric instability, wind front, unstable air-mass, current front, falling land wind, large gravity waves, low wind area, natural slicks, swell visible and wind sheltered area. The results presented as smoothed basic profiles and textural spectra allow to tackle oil slicks supervised classification in new images. Oil slicks and current front are discriminated. But, some ambiguities of slicks discrimination in SAR images remain persistent.