Search results for "Curse"

Dimensionality Reduction via Regression in Hyperspectral Imagery

2015

This paper introduces a new unsupervised method for dimensionality reduction via regression (DRR). The algorithm belongs to the family of invertible transforms that generalize Principal Component Analysis (PCA) by using curvilinear instead of linear features. DRR identifies the nonlinear features through multivariate regression to ensure the reduction in redundancy between he PCA coefficients, the reduction of the variance of the scores, and the reduction in the reconstruction error. More importantly, unlike other nonlinear dimensionality reduction methods, the invertibility, volume-preservation, and straightforward out-of-sample extension, makes DRR interpretable and easy to apply. The pro…

Transfer of arbitrary two-qubit states via a spin chain

2015

We investigate the fidelity of the quantum state transfer (QST) of two qubits by means of an arbitrary spin-1/2 network, on a lattice of any dimensionality. Under the assumptions that the network Hamiltonian preserves the magnetization and that a fully polarized initial state is taken for the lattice, we obtain a general formula for the average fidelity of the two qubits QST, linking it to the one- and two-particle transfer amplitudes of the spin-excitations among the sites of the lattice. We then apply this formalism to a 1D spin chain with XX-Heisenberg type nearest-neighbour interactions adopting a protocol that is a generalization of the single qubit one proposed in Ref. [Phys. Rev. A 8…

From Bi-Dimensionality to Uni-Dimensionality in Self-Report Questionnaires

2021

Abstract. The common factor model – by far the most widely used model for factor analysis – assumes equal item intercepts across respondents. Due to idiosyncratic ways of understanding and answering items of a questionnaire, this assumption is often violated, leading to an underestimation of model fit. Maydeu-Olivares and Coffman (2006) suggested the introduction of a random intercept into the model to address this concern. The present study applies this method to six established instruments (measuring depression, procrastination, optimism, self-esteem, core self-evaluations, and self-regulation) with ambiguous factor structures, using data from representative general population samples. I…

The EDTA Family of Molecular Based Ferromagnets

1991

The bimetallic compounds of the EDTA family offer a large variety of ferrimagnetic model systems in which the dimensionality as well as the exchange-anisotropy can be controlled with ease. This paper deals with the magneto-structural chemistry of this kind of materials, paying particular attention to both the low-dimensional magnetic behavior and the three-dimcnsional magnetic ordering.

La “Donna di Ostuni”, a case of eclampsia 28,000 years ago?

2017

La "Donna di Ostuni", the Lady from Ostuni (fortified medieval city, on the southern Italian Adriatic coast) is the skeleton of "the human most ancient mother" ever found by paleoanthropologists, grave dated of 28,000 years BP. It concerns a 20-years-old woman buried with her baby in her womb estimated at 8 months gestation. To date, the cause of the maternal-fetal deaths is qualified of unknown origin. We propose that eclampsia may be a possible explanation for these deaths (mother and baby together). Eclampsia (convulsions), the curse of human births (non-existent in other mammals), has been described since writings has existed 5000 years ago in all civilisations. This plausible descripti…

Theory of ground state factorization in quantum cooperative systems.

2008

We introduce a general analytic approach to the study of factorization points and factorized ground states in quantum cooperative systems. The method allows to determine rigorously existence, location, and exact form of separable ground states in a large variety of, generally non-exactly solvable, spin models belonging to different universality classes. The theory applies to translationally invariant systems, irrespective of spatial dimensionality, and for spin-spin interactions of arbitrary range.

2019

We investigate how and why the Nokia Corporation failed to develop a successful strategic response to the threats of Apple and Google in the smartphone business and instead worsened its situation t...

La mer et Saint-Malo à la fin du Moyen-Age. L’appareillage de la pérennité

2018

Saint-Malo est baptisé le “Nid des Corsaires”. C’est le port le plus étincelant du royaume de France sous le règne de Louis XIV (Lespagnol, 1995). Comment ne pas retenir les grands noms dont accouche Saint-Malo, avec un navigateur tel que Jacques Cartier ou des corsaires comme René Duguay-Trouin et Robert Surcouf? La prospérité de Saint Malo à l’époque Moderne et la postérité de ses grands noms, ne peuvent se lire qu’en perspective de ferments accomplis par d’autres malouins, dont la petite histoire a été refoulée dans l’ombre d’une plus grande. Comprendre Saint Malo au XIVe siècle nécessite une lecture dichotomique. D’une part, la ville s’inscrit dans la continuité vis-à-vis de son passé, …

A Tsetlin Machine with Multigranular Clauses

2019

The recently introduced Tsetlin Machine (TM) has provided competitive pattern recognition accuracy in several benchmarks, however, requires a 3-dimensional hyperparameter search. In this paper, we introduce the Multigranular Tsetlin Machine (MTM). The MTM eliminates the specificity hyperparameter, used by the TM to control the granularity of the conjunctive clauses that it produces for recognizing patterns. Instead of using a fixed global specificity, we encode varying specificity as part of the clauses, rendering the clauses multigranular. This makes it easier to configure the TM because the dimensionality of the hyperparameter search space is reduced to only two dimensions. Indeed, it tur…

La peine selon François Serpillon, l’auteur du Code criminel, précurseur du Code pénal de 1810

2013

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