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Bouchrika I.,Universite Mohamed Cherif Messaadia de Souk-Ahras
3rd International Conference on Control, Engineering and Information Technology, CEIT 2015 | Year: 2015

The use of biometric technologies becomes ubiquitous in modern society due to the proliferating number of crimes and terror attacks as well as the vital need to provide safer environment. Gait biometrics is considered one of the emerging key research areas due to its potential use in a plethora of applications such as forensics and visual surveillance. As the evaluation of biometric-based evidence in investigation plays a pivotal role for its admissibility in court, we investigate in this research the performance of a model-based approach for people identification over an increasing population. A model-based markerless approach is described to derive the joints positions of walking subjects from uncalibrated single cameras through the use of a haar-like template matching approach. Matching of subjects is performed through posture comparison through a window of frames. Experimental results have shown that increasing the database size, the similarity scores for inter- and intra-class comparisons tend to converge to fixed values that are well separated. This suggests that for larger population, gait analysis can be still deployed and the size of the database should not be a factor impacting on the analysis. © 2015 IEEE. Source

Bouchrika I.,Universite Mohamed Cherif Messaadia de Souk-Ahras
12th International Symposium on Programming and Systems, ISPS 2015 | Year: 2015

The interest in gait as a biometric is strongly motivated by the urgent necessity for automated recognition systems for surveillance applications and forensic analysis. Many studies have now shown that it is possible to recognize people by the way they walk i.e. Gait. As yet there has been little formal study of people recognition using the kinematic-related gait features. In this research study, we have investigated the use of Elliptic Fourier Descriptor for the temporal markerless extraction of human joints. We describe a model-based method whereby spatial model templates for the human motion are described in a parameterized form using the Elliptic Fourier Descriptors accounting for the different variations of scale and rotation. Gait features include the angular measurements of the legs as well as the spatial displacement of the body trunk. To further refine gait features based on their discriminability, a feature selection algorithm which is applied using a proposed validation-criterion based on the proximity of neighbors. Initial experiments have revealed that gait angular measurements derived from the joint motions mainly the ankle, knee and hip angles embed most of the discriminatory potency for gait identification. © 2015 IEEE. Source

Zarzour H.,Universite Mohamed Cherif Messaadia de Souk-Ahras | Sellami M.,Annaba University
International Journal of Computer Applications in Technology | Year: 2013

Commutative Replicated Data Type (CRDT) is a convergence philosophy invented as a new generation of technique that ensures consistency maintenance of replica in collaborative editors without any difficulty over Peer-to-Peer (P2P) networks. This technique has been successfully applied to different data representation types in scalable collaborative editing for linear, tree document structure and semi-structured data types but not yet on set data type ensuring Causality, Consistency and Intention (CCI) preservation criteria. In this paper, we propose a srCE approach, a novel CRDT for a set structure to facilitate the collaborative and concurrent editing of Resource Description Framework (RDF) stores in large scale by different members of virtual community. Our approach ensures CCI model and is not tied to a specific case and therefore can be applied for any document that complies to set structure. A prototype implementation using Friend of a Friend (FOAF) data sets with and without the srCE model illustrates significant improvement in scalability and performance. Copyright © 2013 Inderscience Enterprises Ltd. Source

Hamlaoui Y.,Universite Mohamed Cherif Messaadia de Souk-Ahras | Tifouti L.,Annaba University | Pedraza F.,University of La Rochelle
Corrosion Science | Year: 2010

The corrosion resistance of an electroplated (EP) Zn coating whose surface was chemically etched to produce surface defects (pores) is investigated in this work. Impedance and DC polarisation measurements were employed to study the behaviour of such coating in various corrosive media (NaCl, NaOH and rain water). Four different faradaic relaxation processes were clearly revealed in different NaCl concentrations (from 0.1 to 1 M). In the most concentrated solutions at least three relaxation processes at low frequencies (LF) appeared and were related to zinc deposition and dissolution. At lower concentrations and depending on the pH, only one process was observed. The charge transfer resistance (Rct) and the corrosion current (Icorr) were practically stable in the pH range 5-10. In deaerated NaCl 0.1 M, the EIS diagrams showed two time constants at very close frequencies. From the EIS diagrams the porous nature of the coating was highlighted and showed that the dissolution mechanisms occurred at the base of the pores. © 2010 Elsevier Ltd. All rights reserved. Source

Guedri A.,Universite Mohamed Cherif Messaadia de Souk-Ahras
Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability | Year: 2013

This article describes probabilistic calculations that address intergranular stress corrosion cracking of stainless steel piping; a degradation mechanism of major concern to nuclear pressure boundary integrity. The objective is to simulate the cracking of stainless steel piping under intergranular stress corrosion cracking conditions, and to evaluate the structural reliability using remedial actions for intergranular stress corrosion cracking that are limited to benefits of in-service inspections and the induction heating stress improvement process. The results show that an effective in-service inspection requires a suitable combination of flaw detection capability and inspection schedule, and it has been suggested that the residual stresses could be altered to become favorable, thereby improving the reliability piping. © IMechE 2013. Source

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