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Clustering multivariate data that are contaminated by noise is a complex issue, particularly in the framework of mixture model estimation because noisy data can significantly affect the parameters estimates. This paper addresses this problem with respect to likelihood maximization using the Expectation-Maximization algorithm. Two different approaches are compared. The first one consists in defining...
Non-linear transport properties have now been measured in numerous one-dimensional transition metal tri- and tetrachalcogenides. For all these compounds the threshold electric field above which the non-linear state appears goes through a minimum in the vicinity of the Peierls temperature transition. The value of this minimum is all the higher as the Peierls transition occurs at a higher temperature...
As far as RADAR Cross Section (RCS) computations are concerned, meshing inclusions much smaller than the wavelength of interest λ to model microscopic details often leads to untractable problems when target dimensions are much greater than λ. Consequently equivalent material parameters are necessary, and they can be derived from “effective medium approximations” (EMA). In this work we focus on EMA...
RCS issues lead to problems of hundreds of thousands of unknowns as soon as the target gets greater than the wavelength. For computational limiting reasons, details of the coating cannot thus be meshed, even if they play a key role like in metamaterial design. Equivalent boundary conditions or effective medium approximation are then necessary. In this paper we consider spheres with plasmonic coatings...
This paper discusses the RF circuit and system design considerations for W-CDMA homodyne receiver on NF, IIP2, IIP3, LO/TX leakage, I-Q mismatch, DC offsets, etc. A zero-IF receiver front-end SiGe BiCMOS IC is designed, packaged and thoroughly characterized by a set of system-level performance tests across the full frequency band of operation. The measured worst-case cascaded NF for the receiver IC...
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