Analyzing and testing viewability methods in an advertising network

Many of the current online businesses base completely their revenue models in earnings from online advertisement. A problematic fact is that according to recent studies more than half of display ads are not being detected as viewable. The International Advertising Bureau (IAB) has defined a viewable impression as an impression that at least 50% of its pixels are rendered in the viewport during at least one continuous second. Although there is agreement on this definition for measuring viewable impressions in the industry, there is no systematic methodologies on how it should be implemented or the trustworthiness of these methods. In fact, the Media Rating Council (MRC) announced that there are inconsistencies across multiple reports attempting to measure this metric. In order to understand the magnitude of the problem, we conduct an analysis of different methods to track viewable impressions. Then, we test a subset of geometric and strong interaction methods in a webpage registered in the worldwide ad-network ExoClick, which currently serves over 7 billion geo-targeted ads a day to a global network of 65000 web/mobile publisher platforms. We find that the Intersection Observer API is the method that detects more viewable impressions given its robustness towards the technological constraints that face the rest of implementations available. The motivation of this work is to better understand the limitations and advantages of such methods, which can have an impact at a standardisation level in online advertising industry, as well as to provide guidelines for future research based on the lessons learned.This work was possible thanks to the support of “Plan de Doctorados Industriales de la Secretaría de Universidades e Investigación del Departamento de Empresa y Conocimiento de la Generalitat de Catalunya” and the Spanish Ministry of Economy and Competitiveness through the Juan de la Cierva Formación program (FJCI-2017-34926). We also want to thank ExoClick for their support in conducting thisresearchPeer ReviewedPostprint (published version

Integral measurement of the 12C(n, p)12B reaction up to 10 GeV

The integral measurement of the 12C(n, p)12B reaction was performed at the neutron time-offlight facility n TOF at CERN. The total number of 12B nuclei produced per neutron pulse of the n TOF beam was determined using the activation technique in combination with a time-of-flight technique. The cross section is integrated over the n TOF neutron energy spectrum from reaction threshold at 13.6 MeV to 10 GeV. Having been measured up to 1 GeV on basis of the 235U(n, f) reaction, the neutron energy spectrum above 200 MeV has been re-evaluated due to the recent extension of the cross section reference for this particular reaction, which is otherwise considered a standard up to 200 MeV. The results from the dedicated GEANT4 simulations have been used to evaluate the neutron flux from 1 GeV up to 10 GeV. The experimental results related to the 12C(n, p)12B reaction are compared with the evaluated cross sections from major libraries and with the predictions of different GEANT4 models, which mostly underestimate the 12B production. On the contrary, a good reproduction of the integral cross section derived from measurements is obtained with TALYS-1.6 calculations, with optimized parameters.European Atomic Energy Communitys (Euratom) Seventh Framework Programme FP7/2007-2011-CHANDA (No. 605203)Narodowe Centrum Nauki (NCN)-UMO-2012/04/M/ST2/00700Croatian Science Foundation-No. 168

Level densities of transitional Sm nuclei

Experimentally determined level densities of the transitional isotopes 148, 149, 150, 152Sm at excitation energies below and around the neutron binding energy are compared with microcanonical calculations based on a Monte Carlo approach to noncollective level densities, folded with a collective enhancement estimated in the frame of the interacting boson model (IBM). The IBM parameters are adjusted so as to reproduce the low-lying discrete levels of both parities, with the exception of the odd-mass nucleus, 149Sm, where complete decoupling of the unpaired neutron from the core is assumed

Caracterização e avaliação dos percursos pedestres da ilha de Santa Maria

XIV Expedição Científica do Departamento de Biologia - Santa Maria 2009.Na Expedição Científica à ilha de Santa Maria realizada entre 12 e 19 de Julho de 2009, foram caracterizados e avaliados os 3 trilhos pedestres classificados da ilha: Entre a Serra e o Mar - PRC3 SMA, Santo Espírito e a Maia - PR4 SMA e Pico Alto e Anjos - PR2 SMA. Do levantamento efectuado ressaltaram aspectos importantes, tais como: os trilhos encontram-se no geral bem preservados, ainda que existam situações pontuais de falta de informação e/ou segurança para os visitantes; o património natural e cultural da ilha de Santa Maria é vasto, e tem um elevado potencial para a prática de actividades turísticas relacionadas com a natureza. A baixa densidade populacional da ilha (57,5 habitantes/km ), e a vigilância atenta de associações ecológicas, como os “Amigos dos Açores”, terão decerto um papel importante na preservação e manutenção dos trilhos pedestres. Ainda assim, verificou-se no trilho PR4 SMA alguma deposição de resíduos, sobretudo no troço que desce até à antiga fábrica da baleia, provavelmente da responsabilidade dos locais que aí se deslocam para a prática de pesca desportiva; no trilho PR2 SMA, o Barreiro da Faneca é palco de actividades lúdicas TT potencialmente nefastas para o ambiente local, e é difícil, a partir do último troço do percurso, encontrar a melhor direcção para o lugar dos Anjos

Software no ensino e no projecto de estruturas

No presente trabalho descrevem-se os aspectos essenciais do software desenvolvido para a análise linear e não linear de estruturas, baseado nas técnicas do MEF e concebido de forma a ser simples e eficiente a implementação de novos tipos de elementos finitos e de novos modelos constitutivos. A estrutura da informação que serve de base a uma análise linear ou não linear é descrita neste artigo, bem como as características de algumas técnicas computacionais. No final são apresentados alguns exemplos ilustrativos das ferramentas desenvolvidas

Implementação da técnica do arc-length e métodos relacionados no programa de elementos finitos FEMIX

Relatório 06-DEC/E-2

Crack constitutive model to simulate the behavior of fiber reinforced concrete structures failing in punching

For some structural applications, mainly with redundant supports, adding fibers to concrete can be an economic strategy, especially when shear brittle failure mode has a high risk of occurrence. In the present work, a crack constitutive model is proposed to simulate localized failure modes due to punching. The performance of the developed constitutive model was appraised by simulating the behavior observed in punching tests with lightweight panel prototypes of steel fiber reinforced self-compacting concrete (SFRSCC). The values of the parameters required by fracture mode I of the SFRSCC were obtained by inverse analysis.Fundação para a Ciência e a Tecnologia (FCT) - projecto POCTI/ECM/57518/2004 “FICOFIRE - High performance fiber reinforced concrete of enhanced fire resistance”, bolsa de doutoramento SFRH/BD/23326/2005

Multi-fixed smeared 3d crack model to simulate the behavior of fiber reinforced concrete structures

When a concrete structure is subjected to a multi-stress state, different crack modes can be developed. To simulate with enough accuracy these fracture modes, a three dimensional model must be used. In the present work, a multi fixed smeared 3D crack model is proposed to predict the normal and shear failure modes of concrete structures. Softening stress strain diagrams are proposed to model, after crack initiation, the normal and shear components. The performance of the developed model was appraised by simulating the behavior observed in punching tests with lightweight panels of steel fiber reinforced self compacting concrete (SFRSCC).Fundação para a Ciência e a Tecnologia (FCT) - bolsa de doutoramento SFRH/BD/23326/2005, PABERPRO : Conception and implementation of production system of lightweight steel fibre reinforced self-compacting concrete panels” Program POCI 2010 – IDEIA, nº 13-05-04-FDR-00007, contrato ADI/2007/V4.1/0049

Numerical simulation of the nonlinear behavior of RC beams strengthened with NSM CFRP strips

This paper describes some experimental tests carried out in the context of the evaluation of the bond behavior associated with NSM CFRP reinforcement. These results were used in the numerical simulation of the material nonlinear behavior of RC beams strengthened with NSM strips. For this purpose, an elasto-plastic multi-fixed smeared crack model was developed and implemented in the FEMIX computer code. The obtained numerical results are compared with those recorded in the experimental tests

A survey of the role of viewability within the online advertising ecosystem

© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Within the online advertising ecosystem, viewability is defined as the metric that measures if an ad impression had the chance of being viewable by a potential consumer. Although this metric has been presented as a potential game-changer within the ad industry, it has not been fully adopted by the stakeholders, mainly due to disagreement between the different parties on the standards to implement and measure it, and its potential benefits and drawbacks. In this study, we present a survey of the role that viewability can have on the main challenges of the online advertising ecosystem depicting the main applications, benefits and issues. With this objective, we provide an overall picture of how viewability can fit within the ecosystem, which can help the different stakeholders to work on its adoption, integration and establishing a research agenda.This work was supported by the Plan de Doctorados Industriales de la Secretaría de Universidades e Investigación del Departamento de Empresa y Conocimiento de la Generalitat de Catalunya under the Grant 2018-DI-059 and by ExoClick. Furthermore, this work received support from the Fellowship through ‘‘la Caixa’’ Foundation under Grant ID100010434, from the European Union’s Horizon 2020 Research and Innovation Program through Marie Skłodowska-Curie Grant under Agreement 847648, from the Fellowship under Grant CF/BQ/PR20/11770009, from the Spanish Ministry of Economy and Competitiveness through Juan de la Cierva Formación Program under Grant FJCI-2017-34926 and from the Spanish Government under Grant PID2020-113795RB-C31 ‘‘COMPROMISE’’.Peer ReviewedPostprint (published version