Joint Estimation of Location and Scatter in Complex Elliptically Symmetric Distributions

The joint estimation of the location vector and the shape matrix of a set of independent and identically Complex Elliptically Symmetric (CES) distributed observations is investigated from both the theoretical and computational viewpoints. This joint estimation problem is framed in the original context of semiparametric models allowing us to handle the (generally unknown) density generator as an infinite-dimensional nuisance parameter. In the first part of the paper, a computationally efficient and memory saving implementation of the robust and semiparmaetric efficient R-estimator for shape matrices is derived. Building upon this result, in the second part, a joint estimator, relying on the Tyler’s M-estimator of location and on the R-estimator of shape matrix, is proposed and its Mean Squared Error (MSE) performance compared with the Semiparametric Cramér-Rao Bound (SCRB).

     

Onde de frange pour une discontinuité de courbure

The fringe wave is defined, following the physical theory of diffraction, as the difference between the total field and the field radiated by the physical optics currents. This concept is generalised to the case of the discontinuity in the curvature. It is necessary, to get a finite result for normal incidence, to define the fringe wave as the difference between the total field and the field radiated by the two first terms of the current given by the Luneburg-Kline development. Explicit formulas are given, for the perfectly conducting and for the impedance boundary condition cases.     

Ultrasound elastography based on multiscale estimations of regularized displacement fields

Elasticity imaging is based on the measurements of local tissue deformation. The approach to ultrasound elasticity imaging presented in this paper relies on the estimation of dense displacement fields by a coarse-to-fine minimization of an energy function that combines constraints of conservation of echo amplitude and displacement field continuity. The multiscale optimization scheme presents several characteristics aimed at improving and accelerating the convergence of the minimization process. This includes the nonregularized initialization at the coarsest resolution and the use of adaptive configuration spaces. Parameters of the energy model and optimization were adjusted using data obtained from a tissue-like phantom material. Elasticity images from normal in vivo breast tissue were subsequently obtained with these parameters. Introducing a smoothness constraint into motion field estimation helped solve ambiguities due to incoherent motion, leading to elastograms less degraded by decorrelation noise than the ones obtained from correlation-based techniques.     

圆弧青霉脂肪酶基因的克隆和表达

圆弧青霉PG37总RNA甲醛变性电泳呈现真核生物所特有的 2 8SrRNA和 18SrRNA条带 .根据PG37所产碱性脂肪酶 (LipPC)N末端氨基酸残基序列和真核生物mRNA在 3’端具有poly(A)等所提供的生物信息 ,采用RT PCR技术扩增了LipPC成熟肽和 3’非编码区的cDNA片段 ,并将该PCR产物直接克隆至pUCm T载体中 .序列分析表明 ,LipPC含有 2 5 8个氨基酸残基 ,其中保守的五肽序列为Gly His Ser Leu Gly .进一步采用ClonTech公司的SmartTM PCRcDNA文库构建试剂盒 ,扩增、克隆和测定了自转录起始点至编码区的cDNA片段 ,从而完成了LipPC完整cDNA的分析测定 .最后将编码完整脂肪酶蛋白质的cDNA克隆至 pGEX 5X 3表达载体中 ,SDS PAGE检测结果表明 ,大肠杆菌BL2 1所表达的GST LipPC融合蛋白质分子质量约为 5 3ku .     

Securing Scan Control in Crypto Chips

The design of secure ICs requires fulfilling means conforming to many design rules in order to protect access to secret data. On the other hand, designers of secure chips cannot neglect the testability of their chip since high quality production testing is primordial to a good level of security. However, security requirements may be in conflict with test needs and testability improvement techniques that increase both observability and controllability. In this paper, we propose to merge security and testability requirements in a control-oriented design for security scan technique. The proposed security scan design methodology induces an adaptation of two main aspects of testability technique design: protection at protocol level and at scan path level. Without loss of generality, the proposed solution is evaluated on a simple crypto chip in terms of security and design cost.

Analysis of Frequency Selective Surfaces at Millimeter Wave Band Using the Hertz Vector Potential Method

In this work, the Hertz vector potential method was used to obtain the dyadic Green’s function components for frequency selective surfaces (FSS) on an anisotropic layer. The considered structures are composed by periodic arrays of conducting crossed dipole and rectangular patch elements. Results of reflected power were obtained by using the moment method. Curves for the reflected power versus frequency are presented as function of the structural parameters, assuming x, y, and z orientation for the optical axis in the anisotropic substrate.     

High pass filter with above IC integrated SrTiO3 high K MIM capacitors

This paper describes realization and characterization of SrTiO₃ (STO) high K MIM capacitors above BiCMOS integrated circuit (IC). These capacitances are connected to IC and are used as coupling capacitors in order to realize a high pass filter. Surface capacitance achieved is 10 nF/mm² with capacitance value of 1.2 nF. The process for STO MIM fabrication does not exceed 400 °C, which is compatible with interconnections. Typical K and dielectric losses values obtained are, respectively 110% and 2%. Yield obtained reaches 83% for capacitors. A functional high pass filter using these STO capacitors was realized in this study. It exhibits a cut-off frequency at 6.5 kHz and a constant gain at higher frequencies of −1.3 dB.     

Fabrication of a Macroporous Microwell Array for Surface‐Enhanced Raman Scattering

Here, a colloidal templating procedure for generating high‐density arrays of gold macroporous microwells, which act as discrete sites for surface‐enhanced Raman scattering (SERS), is reported. Development of such a novel array with discrete macroporous sites requires multiple fabrication steps. First, selective wet‐chemical etching of the distal face of a coherent optical fiber bundle produces a microwell array. The microwells are then selectively filled with a macroporous structure by electroless template synthesis using self‐assembled nanospheres. The fabricated arrays are structured at both the micrometer and nanometer scale on etched imaging bundles. Confocal Raman microscopy is used to detect a benzenethiol monolayer adsorbed on the macroporous gold and to map the spatial distribution of the SERS signal. The Raman enhancement factor of the modified wells is investigated and an average enhancement factor of 4 × 10⁴ is measured. This demonstrates that such nanostructured wells can enhance the local electromagnetic field and lead to a platform of ordered SERS‐active micrometer‐sized spots defined by the initial shape of the etched optical fibers. Since the fabrication steps keep the initial architecture of the optical fiber bundle, such ordered SERS‐active platforms fabricated onto an imaging waveguide open new applications in remote SERS imaging, plasmonic devices, and integrated electro‐optical sensor arrays.     

Evolution of the AgCdO Contact Material Surface Microstructure with the Number of Arcs

This paper describes a study of the evolution of the AgCdO contact material surface microstructure as a function of the number of electrical arcs imposed on the switching surface. Five power switching devices were tested under different conditions. They were subjected to, respectively, 1, 2, 3, 10, and 100 electrical arcs under the same operating conditions: supply current of 400 A, circuit voltage of 28 V direct current (DC), and resistive load. For the analysis, a binocular microscope and a scanning electron microscope with an energy-dispersive x-ray spectrometer were used.     

Cryptanalysis of MD2

This paper considers the hash function MD2 which was developed by Ron Rivest in 1989. Despite its age, MD2 has withstood cryptanalytic attacks until recently. This paper contains the state-of-the-art cryptanalytic results on MD2, in particular collision and preimage attacks on the full hash function, the latter having complexity 2⁷³, which should be compared to a brute-force attack of complexity 2¹²⁸.