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Item type:Item, Access status: Metadata only , Structural damage detection on a full-scale masonry cross-vault subjected to quasi-static cyclic loading tests(International Operational Modal Analysis Conference (IOMAC), 2025) Bendezu, A.; Pellegrini, D.; Chácara, C.; Pontificia Universidad Católica del Perú. Departamento de IngenieríaThis paper presents the results of an experimental campaign for structural damage detection on a full-scale alternative-masonry cross-vault subjected to quasi-static cyclic tests. The masonry constituent material was composed of stabilised compressed earth blocks and soil-cement mortar. The cross-vault specimen presented a square plan with a span of approximately 3.20 m. Its boundary conditions consisted of two fixed corners that restrained displacements and rotations in all directions, and two corners that were placed over four-wheeled steel masses that enabled horizontal displacements. The masonry cross-vault was subjected to incremental horizontal cyclic load following a displacement-controlled approach to capture its in-plane shear failure. A total of 14 cyclic load sequences were applied to the specimen, reaching a maximum displacement of about 40 mm. The damage detection was evaluated in terms of frequency decrease and modal shape variations, estimated by operational modal analyses (OMA) technique carried out every two cyclic loads sequences considering ambient vibrations as excitation source. The Enhanced Frequency Domain Decomposition (EFDD) method implemented in the ARTeMIS Modal software estimated the specimen's frequencies. The results show an important decay in natural frequencies and variations of the first three mode shapes, especially when the vault experienced severe damage.Item type:Item, Access status: Metadata only , Revisiting Syllables in Language Modelling and their Application on Low-Resource Machine Translation(Association for Computational Linguistics (ACL), 2022) Oncevay, A.; Rojas, K.D.R.; Sanchez, L.K.C.; Zariquiey, R.; Pontificia Universidad Católica del PerúLanguage modelling and machine translation tasks mostly use subword or character inputs, but syllables are seldom used. Syllables provide shorter sequences than characters, require less-specialised extracting rules than morphemes, and their segmentation is not impacted by the corpus size. In this study, we first explore the potential of syllables for open-vocabulary language modelling in 21 languages. We use rule-based syllabification methods for six languages and address the rest with hyphenation, which works as a syllabification proxy. With a comparable perplexity, we show that syllables outperform characters and other subwords. Moreover, we study the importance of syllables on neural machine translation for a non-related and low-resource language-pair (Spanish–Shipibo-Konibo). In pairwise and multilingual systems, syllables outperform unsupervised subwords, and further morphological segmentation methods, when translating into a highly synthetic language with a transparent orthography (Shipibo-Konibo). Finally, we perform some human evaluation, and discuss limitations and opportunities.Item type:Item, Access status: Metadata only , Changes in relations between Russia and Peru (2006 - 2016): Political and trade considerations(Institute of Latin American Studies, Russian Academy of Sciences, 2018) Vidarte Arévalo, Oscar; Ladines Azalia, Juan Carlos; Pontificia Universidad Católica del Perú. Departamento de Ciencias socialesLas relaciones entre Lima y Moscú se han desarrollado en forma muy cambiante. Una gran dinámica bilateral en las décadas del 70 y 80 dio paso a una relación distante. Esto va a variar en el siglo XXI. Entre el 2006 y el 2016, se va a llevar a cabo un importante acercamiento. El nuevo papel de Rusia en el mundo y su difícil relación con Occidente, las oportunidades económicas existentes, así como las transformaciones políticas en América Latina (y el rol del Perú en este contexto), son aspectos a considerar para entender este nuevo momento en las relaciones. No obstante, este acercamiento no estuvo exento de problemas. La relevancia política que tiene para el Perú la relación con Estados Unidos de América y la Unión Europea, las diferencias en materia económica entre Rusia y los países del Pacífico del Sur latinoamericano, y la cada vez mayor presencia de la República Popular China en la región, no han permitido la consolidación del vínculo entre ambos paísesItem type:Item, Access status: Metadata only , New Methodologies in the Teaching of Hydraulics Based on Experimentation and CFD(International Association for Hydro-Environment Engineering and Research, 2019) Yoch, P.; Richard, P.; Jose, C.; Pontificia Universidad Católica del Perú. Departamento de Ingeniería CivilLectures and experimental laboratories are fundamental elements for the teaching of hydraulics. The development and advance of this technology, gives us today the possibility of measuring, predicting and analyzing the behavior of a large number of hydraulic variables associated with an experiment; however, many of the hydraulics laboratories intended for teaching, do not have these facilities (e.g. PIV, LIST, ADV, Ultra-high-speed cameras, etc). In order to understand the behavior of flow patterns at different scales, this methodology has been implemented based on experimental data collection and complemented with sophisticated CFD Tools. The results of CFD models show mainly high spatial-temporal resolution hydraulic parameters, such as velocity profiles, water-air interface captures, turbulence, flow patterns, coherent turbulent structures, etc. This paper shows the results that we have obtained by complementing basic measurements of laboratory experiments with high-fidelity simulations with the use of HPC resources for five laboratory sessions and its implementation of the Open Channel Hydraulics course at Pontificia Universidad Católica del Perú.Item type:Item, Access status: Metadata only , Sexual dimorphism in exposure to particulate matter (PM2.5) and residential radon (Rn), and its association with incidence rates of TB and lung cancer (CaP) in the 43 districts of Metropolitan Lima; Dimorfismo sexual en la exposición a material particulad(Medical Body of the Almanzor Aguinaga Asenjo National Hospital, 2025) Ordoñez-Aquino, C.; Vásquez-Velásquez, C.; Pereyra, P.; Cotrina Montenegro, E.; Paredes, S.; Beltrán Gárate, B.; Gonzales, G.F.; Pontificia Universidad Católica del PerúIntroduction: Previous studies have associated exposure to fine particulate matter (PM2.5) with higher rates of tuberculosis (TB), especially among men. Likewise, a causal relationship between TB and lung cancer (LC) has been demonstrated. On the other hand, residential radon gas (222Rn) is a well-known carcinogen and the leading cause of LC among non-smokers. Objective: To evaluate the ecological association between PM2.5 and/or 222Rn levels and tuberculosis (TB) and lung cancer (LC) rates in adults over 60 years of age of both sexes, in the 43 districts of Metropolitan Lima, during the period 2019–2022. Materials and Methods: A cross-sectional observational study using secondary data analysis. TB and LC data were obtained from the Ministry of Health, PM2.5 estimates were derived using the WRF-Chem model, and 222Rn concentrations were measured with G2 diffusion chambers. For the associative analysis, negative binomial regression models were constructed using STATA statistical software version 18.0. Results: A positive association was observed between lung cancer (LC) and the top tertile of TB rates (IRR: 1.61; 95%CI: 1.12–2.29), although there was no evidence of an inverse relationship. Exposure to PM2.5 was associated with PC in males (IRR: 1.02; 95% CI: 1.00–1.02), while exposure to 222Rn showed a significant association with PCa in both sexes (female IRR: 1.44; Male IRR: 1.34). In women, only 222Rn was associated with PC; in males, independent associations with PM2.5, TBC, and 222Rn were identified. Conclusions: The results suggest a possible sexual dimorphism in the ecological relationship between the exposure factors evaluated and lung cancer (LC) rates, with the districts with the highest rates being more frequently associated with males.
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