Abstract In conventional support vector data description (SVDD), for each class we look for the smallest sphere that encloses its data. in the decision phase a sample is classified into class i only when the value of the ith decision function is positive. Following this architecture, an unclassifiable region (s) can be appeared if the values of more than one decision... In conventional support vector data description (SVDD), for each class we look for the smallest sphere that encloses its data. in the decision phase a sample is classified into class i only when the value of the ith decision function is positive. Following this architecture, an unclassifiable region (s) can be appeared if the values of more than one decision function are positives. To overcome this problem, we propose a new simple and powerful decision function, which is used only in the overlapped regions, this membership function can be calculated in the feature space and can be represented by kernels functions. This method gives good performance on reducing the effects of overlap and significantly improves the classification. We demonstrate the performance of our decision function using six benchmark datasets. Read More Read Less

Abstract Dependability is a major requirement of complex systems which consists of the system’s ability to offer a trusted and reliable service. Service Component Architecture is a promising and recent approach and an industry standard for developing complex and distributed systems. To be adopted in a safety-critical environment it must handle dependability requirements and offer tools and frameworks to certify the... Dependability is a major requirement of complex systems which consists of the system’s ability to offer a trusted and reliable service. Service Component Architecture is a promising and recent approach and an industry standard for developing complex and distributed systems. To be adopted in a safety-critical environment it must handle dependability requirements and offer tools and frameworks to certify the reliability level of the components and the system. In this paper we present main techniques and models for assuring quality and trustworthiness of component-based systems in general, and then we present and justify the choice of the design by contract approach that we adopted for the following of our research about SCA-based systems. Design by Contract is an approach of software design that aims to address reliability and quality issues in software development by expressing a set of its properties and constraints. Read More Read Less

Abstract Within the efforts of publishing online digital libraries, we propose in this paper a new model of a collaborative semantic annotation platform of digitized old documents, which is based on using new technologies of the Semantic Web. In our model, annotations associated with a digitized document are realized by a group of annotators interested in its documentary content to accelerate... Within the efforts of publishing online digital libraries, we propose in this paper a new model of a collaborative semantic annotation platform of digitized old documents, which is based on using new technologies of the Semantic Web. In our model, annotations associated with a digitized document are realized by a group of annotators interested in its documentary content to accelerate the Semantic Annotation Process. The annotations are expressed as RDF triples and stored in data repositories. These data repositories are managed by an Annotation Server. With this generic structure of annotations, the available documentary resources in the library are accessible and exploitable by various Semantic Web Agents using the same protocol and query language SPARQL, in contrast to the ’classic libraries’ where access to documentary resources is restricted by specialized web services. Read More Read Less

Abstract This paper presents a robust algorithm for the Structure From Motion (SFM) problem resolution using a stepby- step non-linear optimization scheme. The proposed algorithm is composed by two main parts. In the first part a projective reconstruction is computed. Here, the reconstruction is initialized based on the epipolar geometry of the scene and then refined using a robust non-linear optimization.... This paper presents a robust algorithm for the Structure From Motion (SFM) problem resolution using a stepby- step non-linear optimization scheme. The proposed algorithm is composed by two main parts. In the first part a projective reconstruction is computed. Here, the reconstruction is initialized based on the epipolar geometry of the scene and then refined using a robust non-linear optimization. To upgrade the reconstruction to a metric one, the second part of the algorithm consists on computing the camera intrinsic parameters. To deal with the drawback of computing all intrinsic parameters at once and avoid the possibility of converging to a local minimum, the matrix of camera intrinsic parameters is firstly initialized and then each parameter is estimated alone in a multi-stage scheme. Once computed, the intrinsic parameters are introduced in a state-of-the-art Multi-View Stereo (MVS) to generate the dense 3D model of the scene. MVS methods take images with camera internal parameters as input and produce dense 3D models with accuracy nearly on par with laser scanners. Read More Read Less

Abstract In this paper, we present a game theoretic framework for different type of distributed system problem like load balancing, maximizing network throughput, and dynamic network selection. This type of problem give different result depends on environment of distributed systems. We analyze different game theory approaches with their advantage and disadvantage. Finally conclude chapter with comparing Game theory model according to... In this paper, we present a game theoretic framework for different type of distributed system problem like load balancing, maximizing network throughput, and dynamic network selection. This type of problem give different result depends on environment of distributed systems. We analyze different game theory approaches with their advantage and disadvantage. Finally conclude chapter with comparing Game theory model according to their problem statement. Read More Read Less

Abstract Black hole is one of the most malicious attacks that target sensors routing protocols. The impact of this attack can be very harmful on hierarchical routing protocols. Several security solutions have been proposed to secure WSNs from black hole attacks. However, most of these solutions are complex and energy inefficient. In this paper we propose a hierarchical energy efficient intrusion... Black hole is one of the most malicious attacks that target sensors routing protocols. The impact of this attack can be very harmful on hierarchical routing protocols. Several security solutions have been proposed to secure WSNs from black hole attacks. However, most of these solutions are complex and energy inefficient. In this paper we propose a hierarchical energy efficient intrusion detection mechanism, to protect sensor network from black hole attacks. Our approach is simple and based on control packets exchange between sensor node and base station. We have experimentally evaluated our system using the NS simulator to demonstrate its effectiveness in detecting and preventing efficiently the black hole attacks. Read More Read Less

Abstract As wireless access networks are being developed to provide the users with always-on connectivity and better QoS, many papers have addressed the issue of providing service adaptation for the multimedia application in the case of vertical handovers VHO. Thus providing service continuity while roaming among different wireless access networks is one of the most challenging issues of Next Generation Wireless... As wireless access networks are being developed to provide the users with always-on connectivity and better QoS, many papers have addressed the issue of providing service adaptation for the multimedia application in the case of vertical handovers VHO. Thus providing service continuity while roaming among different wireless access networks is one of the most challenging issues of Next Generation Wireless Networks NGWN. Context awareness has showed a significant effect to guarantee services continuity. In this paper, we will study the performance of voice and video applications based on the proposed Context-Aware Management Scheme (CAMS) in terms of different performance parameters such as jitter, packet loss and end-to end delay in the case of vertical handovers VHO from WiFi to WiMax. We will then present the performance of video application for different service adaptation scenarios based on our proposed solution. Read More Read Less

Abstract Thanks to the development of technology of image productions and processing, the need of avoiding the traditional research based on user’s annotation is becoming more interesting; the content based image retrieval technology provides several techniques to solve this problem. In this paper we aim to propose and evaluate the combined use of D-index structure and smooth curve decomposition descriptor so... Thanks to the development of technology of image productions and processing, the need of avoiding the traditional research based on user’s annotation is becoming more interesting; the content based image retrieval technology provides several techniques to solve this problem. In this paper we aim to propose and evaluate the combined use of D-index structure and smooth curve decomposition descriptor so as to enable accurate and fast content based image retrieval. Furthermore, this work provides an experimental analysis of D-index parameter choice and an experimental demonstration of the efficiency of D-index method through comparing its results with other known ones. Read More Read Less