Eyelid Localization for Iris Identification

This article presents a new eyelid localization algorithm based on a parabolic curve fitting. To deal with eyelashes, low contrast or false detection due to iris texture, we propose a two steps algorithm. First, possible edge candidates are selected by applying edge detection on a restricted area inside the iris. Then, a gradient maximization is applied along every parabola, on a larger area, to refine parameters and select the best one. Experiments have been conducted on a database of 151 iris that have been manually segmented. The performance evaluation is carried out by comparing the segmented images obtained by the proposed method with the manual segmentation. The results are satisfactory in more than 90% of the cases

Distinguishing multiplications from squaring operations

Abstract. In this paper we present a new approach to attacking a modular exponentiation and scalar multiplication based by distinguishing multiplications from squaring operations using the instantaneous power consumption. Previous approaches have been able to distinguish these operations based on information of the specific implementation of the embedded algorithm or the relationship between specific plaintexts. The proposed attack exploits the expected Hamming weight of the result of the computed operations. We extrapolate our observations and assess the consequences for elliptic curve cryptosystems when unified formulae for point addition are used

Phenotypic spectrum and transcriptomic profile associated with germline variants in TRAF7

PURPOSE: Somatic variants in tumor necrosis factor receptor-associated factor 7 (TRAF7) cause meningioma, while germline variants have recently been identified in seven patients with developmental delay and cardiac, facial, and digital anomalies. We aimed to define the clinical and mutational spectrum associated with TRAF7 germline variants in a large series of patients, and to determine the molecular effects of the variants through transcriptomic analysis of patient fibroblasts. METHODS: We performed exome, targeted capture, and Sanger sequencing of patients with undiagnosed developmental disorders, in multiple independent diagnostic or research centers. Phenotypic and mutational comparisons were facilitated through data exchange platforms. Whole-transcriptome sequencing was performed on RNA from patient- and control-derived fibroblasts. RESULTS: We identified heterozygous missense variants in TRAF7 as the cause of a developmental delay-malformation syndrome in 45 patients. Major features include a recognizable facial gestalt (characterized in particular by blepharophimosis), short neck, pectus carinatum, digital deviations, and patent ductus arteriosus. Almost all variants occur in the WD40 repeats and most are recurrent. Several differentially expressed genes were identified in patient fibroblasts. CONCLUSION: We provide the first large-scale analysis of the clinical and mutational spectrum associated with the TRAF7 developmental syndrome, and we shed light on its molecular etiology through transcriptome studies

Journal intime. Années 1839 à 1848. Edition nouvelle, précédée d'une introduction et accompagnée de notes par Léon Bopp.

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Identification by local analysis of iris-extracted patterns

L'identification par l'iris repose généralement sur une comparaison globale de signatures extraites des iris. Cette méthode ne prend pas en compte les distorsions introduites par le système d'acquisition ou les imperfections de segmentation. Pour pallier ce problème, nous proposons de combiner des mesures de distances réalisées localement sur des fenêtres glissantes. La règle de fusion (moyenne pondérée) permet de prendre en compte la quantité et la fiabilité des informations contenues dans les sous-régions de l'iris. Nous obtenons, sur une base de données extraite de CASIA, des résultats similaires voire meilleurs que ceux publiés dans la littérature, pour un jeu d'iris contenant deux fois plus d'individus

Collision fault analysis of DPAresistant algorithms, Fault Diagnosis and Tolerance

Abstract. In this paper several attacks are presented that allow information to be derived on faults injected at the beginning of cryptographic algorithm implementations that use Boolean masking to defend against Differential Power Analysis (DPA). These attacks target the initialisation functions that are used to enable the algorithm to be protected, allowing a fault attack even in the presence of round redundancy. A description of the experiments leading to the development of these attacks is also given.

Destabilization of UHT milk induced by different strains of Pseudomonas fluorescens - Role of AprX enzyme -

Destabilizations of casein micelles can be observed after modifications of physico-chemical conditions or their proteolysis with as consequence gelation or sedimentation. In this context, the objective of this work were to 1.appreciate the variability of this destabilization of UHT milk during their storage as a function of the strains of Pseudomonas and 2.understand the physico-chemical modifications of casein micelles induced by 9 strains of Pseudomonas fluorescens and also by AprX, an extracellular protease produced by one strain of Pseudomonas fluorescens F. After inoculation of raw milk by these strains or after addition of different concentrations of purified AprX protease in raw milk and UHT treatment, milk destabilization was determined at macroscopic, colloidal and molecular levels. For experiments testing the strain variability, 5 on the 9 tested strains were highly destabilizing. For experiment with purified AprX enzyme, destabilizations were also observed. In all these cases, instabilities were visual (presence of sediment) and increasing as a function of time (after several days or weeks depending on the strains and the concentrations of added enzyme). The analyses of the destabilized UHT milks revealed the presence of aggregates. The zeta potentials and hydrations of casein micelles decreased. At molecular level, we determined a significant proteolysis. The determination by liquid chromatography coupled to mass spectrometry of one part of the released peptides indicated that the α s1-, α s2-, β - and κ-caseins were hydrolyzed with a quantitative preference for β -casein. The nature of the different peptides released was similar for all destabilized UHT milks. The decrease in the stability of casein micelles will be discussed in relation with the modifications of structure and the observed proteolysis. Potential application of this research in term of detection of unstable UHT milks will be proposed knowing that this enzyme is heat-resistant and its implication in the destabilisation of UHT milk during its storage is often evoked

Hydrolysis of Casein Micelles by AprX Enzym from Pseudomonas fluorescens Induces their Déstabilisation

Casein micelle is a colloidal structure containing different casein molecules and calcium phosphate. Different forces are involved in this micellar organisation and contribute to their stability. However micellar destabilisations can be observed after modifications of physico-chemical conditions like acidification, calcium addition, intensive heat treatments, high pressure or proteolysis with as consequence the formation of a gel or a sediment. The objective of this work was to understand the physico-chemical modifications of casein micelles by AprX, an extracellular protease produced by a psychrotrophic bacteria Pseudomonas fluorescens commonly found in raw milk. For this, we studied the milk destabilisation at macroscopic, colloidal and molecular levels after 1. Inoculation of raw milk by Pseudomonas fluorescens and UHT treatment; 2. Addition of chromatographically purified AprX protease from Pseudomonas fluorescens in milk. For both types of experiment (addition of bacteria or enzyme), destabilisation appeared visually (presence of sediment) and progressively as a function of time. This destabilisation was also determined by measuring the phosphate stability named Ramsdell test. Aggregates were formed with in parallel decreases in the zeta potential and hydration of casein micelles. At molecular level, peptides were released from casein micelles. By reversed phase liquid chromatography coupled to tandem mass spectrometry, one part of the peptides was identified. The as1-, as2-, ab- and k-caseins were hydrolyzed with a quantitative preference for b-casein.The decrease in the stability of casein micelles will be discussed in relation with the modifications of structure and the observed proteolysis. Potential application of this research in term of detection of unstable UHT milks will be proposed knowing that this enzyme is heat-resistant and its implication in the destabilisation of UHT milk during its storage is often evoked