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A specialized interior-point algorithm for huge minimum convex cost flows in bipartite networks
(Elsevier, 2021-05)
Article
Restricted access - publisher's policyThe computation of the Newton direction is the most time consuming step of interior-point methods. This direction was efficiently computed by a combination of Cholesky factorizations and conjugate gradients in a specialized ... -
Recent advances in optimization techniques for statistical tabular data protection
(Elsevier, 2012-01-16)
Article
Open AccessOne of the main services of National Statistical Agencies (NSAs) for the current Information Society is the dissemination of large amounts of tabular data, which is obtained from microdata by crossing one or more categorical ... -
A new interior-point approach for large separable convex quadratic two-stage stochastic problems
(2020-11-03)
Article
Open AccessTwo-stage stochastic models give rise to very large optimization problems. Several approaches havebeen devised for efficiently solving them, including interior-point methods (IPMs). However, usingIPMs, the linking columns ... -
Stabilized Benders methods for large-scale combinatorial optimization, with application to data privacy
(2020-07)
Article
Open AccessThe Cell Suppression Problem (CSP) is a very large Mixed-IntegerLinear Problem arising in statistical disclosure control. However, CSPhas the typical structure that allows application of the Benders de-composition, which ... -
An online optimization-based procedure for the assignment of airplane seats
(Springer, 2021)
Article
Open AccessDue to the large number of air flights these days, all procedures involved in their operational management should be carefully optimized. This work presents a novel approach to the seat assignment problem, which focuses ... -
A hazard ratio was estimated by a ratio of median survival times, but with considerable uncertainty
(2014-10-01)
Article
Open AccessObjectives: To evaluate the empirical concordance between the hazard ratio (HR) and the median ratio (MR) in survival cancer studies. Study Design and Setting: We selected all cancer survival articles from the New England ... -
The impact of COVID-19 on teaching in statistics and operations research in higher education
(Sociedad de Estadística e Investigación Operativa (SEIO), 2020-07)
Article
Open AccessThis study analyzed the current situation of education in the context of the pandemic caused by COVID-19. The worldwide health emergency situation has caused the confinement of people and with it, the closure of centers ... -
Critical evaluation of European balancing markets to enable the participation of Demand Aggregators
(2020-04-15)
Article
Restricted access - publisher's policyEuropean Directives are incentivizing consumers to play an active role in the electricity system and to collaborate to maintain its stability, which has been historically provided by large generation power plants. However, ... -
Development of ARCADIA: a tool for assessing the quality of peer-review reports in biomedical research
(2020-06)
Article
Open AccessObjective To develop a tool to assess the quality of peer- review reports in biomedical research. Methods We conducted an online survey intended for biomedical editors and authors. The survey aimed to (1) determine if ... -
Management and activation of energy flexibility at building and market level: a residential case study
(2020-03-01)
Article
Open AccessThe electricity sector foresees a significant change in the way energy is generated and distributed in the coming years. With the increasing penetration of renewable energy sources, smart algorithms can determine the ... -
Comparison between economic and environmental drivers for demand side aggregator
(2020-08)
Article
Open AccessDemand-side flexibility is a promising source of the energy system that might enhance renewable energy penetration and help to democratize the electricity sector. However, it is not clear what is the best strategy to adopt ... -
Using interior point solvers for optimizing progressive lens models with spherical coordinates
(2019-12-19)
Article
Open AccessDesigning progressive lenses is a complex problem that has been previously solved by formulating an optimization model based on Cartesian coordinates. This work presents a new progressive lens model using spherical ...
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