27 citations · 49 across the 10 of their papers we have counts for
14 papers
Towards Efficient Threat Intelligence Instruction Tuning via Quality-Aware and Optimal Transport-Guided Data Selection
Jiyu Tian, Mingchu Li, Xiangwei Chen +1
High-quality data is essential for improving instruction tuning in threat intelligence analysis. However, existing methods for generating cybersecurity instruction data lack reliab…
Eigenspaces of Preserved Graph Laplacian Eigenvalues under Positive Edge-Weight Addition
Maribel Bueno, Susana Furtado, Javier Pérez
We study how the eigenspace associated with a fixed graph Laplacian eigenvalue changes under positive edge updates, allowing both new edges and increases in existing edge weights.…
Implications of Dynamical Dark Energy in the expansion of the Universe and the Structure Formation
Javier de Cruz Pérez
In this PhD thesis a wide variety of cosmological models beyond the CDM are studied in detail. Great emphasis is put on the running vacuum models (RVM's), which can be motivated…
Ariel: Enabling planetary science across light-years
Giovanna Tinetti, Paul Eccleston, Carole Haswell +313
Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as the fourth medium-class mission in ESA's Cosmic Vision programme to be launched in 2029. Durin…
Structured strong -ifications for structured matrix polynomials in the monomial basis
Fernando De Terán, Carla Hernando, Javier Pérez
In the framework of Polynomial Eigenvalue Problems, most of the matrix polynomials arising in applications are structured polynomials (namely (skew-)symmetric, (skew-)Hermitian, (a…
Linearizations of rational matrices from general representations
Javier Pérez, María C. Quintana
We construct a new family of linearizations of rational matrices written in the general form , where , , and are poly…
A Spatial Concordance Correlation Coefficient with an Application to Image Analysis
Ronny Vallejos, Javier Pérez, Aaron M. Ellison +1
In this work we define a spatial concordance coefficient for second-order stationary processes. This problem has been widely addressed in a non-spatial context, but here we conside…
The conditioning of block Kronecker -ifications of matrix polynomials
Javier Pérez
A strong -ification of a matrix polynomial of degree is a matrix polynomial of degree having the same finite and infinite eleme…
Block minimal bases -ifications of matrix polynomials
Froilán M. Dopico, Javier Pérez, Paul Van Dooren
The standard way of solving a polynomial eigenvalue problem associated with a matrix polynomial starts by embedding the matrix coefficients of the polynomial into a matrix pencil,…
Automatic rational approximation and linearization of nonlinear eigenvalue problems
Pieter Lietaert, Javier Pérez, Bart Vandereycken +1
We present a method for solving nonlinear eigenvalue problems using rational approximation. The method uses the AAA method by Nakatsukasa, Sète, and Trefethen to approximate the no…
Explicit block-structures for block-symmetric Fiedler-like pencils
Maribel Bueno Cachadina, Madeleine Martin, Javier Pérez +2
In the last decade, there has been a continued effort to produce families of strong linearizations of a matrix polynomial , regular and singular, with good properties. As a c…
Mixed forward-backward stability of the two-level orthogonal Arnoldi method for quadratic problems
Karl Meerbergen, Javier Pérez
We revisit the numerical stability of the two-level orthogonal Arnoldi (TOAR) method for computing an orthonormal basis of a second--order Krylov subspace associated with two given…
A unified approach to Fiedler-like pencils via strong block minimal bases pencils
Maribel Bueno Cachadina, Froilán M. Dopico, Javier Pérez +2
The standard way of solving the polynomial eigenvalue problem associated with a matrix polynomial is to embed the matrix polynomial into a matrix pencil, transforming the problem i…
Running vacuum versus the CDM
Adrià Gómez-Valent, Joan Solà, Javier de Cruz Pérez
It is well-known that a constant -term is a traditional building block of the concordance CDM model. We show that this assumption is not necessarily the optimal one from the…