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Author Perrot, K.; Montalva-Medel, M.; de Oliveira, P.P.B.; Ruivo, E.L.P. doi  openurl
  Title Maximum sensitivity to update schedules of elementary cellular automata over periodic configurations Type Journal Article
  Year 2020 Publication Natural Computing Abbreviated Journal Nat. Comput.  
  Volume 19 Issue 1 Pages 51-90  
  Keywords Synchronism sensitivity; Elementary cellular automata; Update digraph  
  Abstract This work is a thoughtful extension of the ideas sketched in Montalva et al. (AUTOMATA 2017 exploratory papers proceedings, 2017), aiming at classifying elementary cellular automata (ECA) according to their maximal one-step sensitivity to changes in the schedule of cells update. It provides a complete classification of the ECA rule space for all period sizes n[ 9 and, together with the classification for all period sizes n <= 9 presented in Montalva et al. (Chaos Solitons Fractals 113:209-220, 2018), closes this problem and opens further questionings. Most of the 256 ECA rule's sensitivity is proved or disproved to be maximum thanks to an automatic application of basic methods. We formalize meticulous case disjunctions that lead to the results, and patch failing cases for some rules with simple arguments. This gives new insights on the dynamics of ECA rules depending on the proof method employed, as for the last rules 45 and 105 requiring o0011THORN induction patterns.  
  Address [Perrot, Kevin] Univ, Aix Marseille Univ.,Toulon,CNRS,UMR 7020, Marseille, France, Email: kevin.perrot@lis-lab.fr  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1567-7818 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000517129300006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1162  
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Author Prieto, P.; Briede, J.C.; Beghelli, A.; Canessa, E.; Barra, C. doi  openurl
  Title I like it elegant: imprinting personalities into product shapes Type Journal Article
  Year 2020 Publication International Journal Of Design Creativity And Innovation Abbreviated Journal Int. J. Des. Creat. Innov.  
  Volume 8 Issue 1 Pages 5-20  
  Keywords Design methodology; concept generation; inspiration  
  Abstract The ability of designing personality-based products is key for their successful launch in the market, since customers prefer products that have a similar personality to their own. However, the creative process designers use to imprint a given personality into a product is still a ?black-box? and lengthy process that requires expertise and successive customer validation. The research challenge here is how to systematize the creative process of defining new geometries of a product with an intended personality. Due to the complexity of this challenge, the focus of this paper is solely about the process of defining the shape of a product with a given personality. A 5-step systematic method to extract and define the key form aspects of a specific personality is defined to do this. The use of the method is exemplified by developing a shape which is representative of an elegant personality and its suitability is tested using questionnaires answered by both design and non-design trained people. Results show that customers better recognize the personality imprinted on the object when the steps of the proposed method are fully complied with. This work will assist designers with the creative process of product form definition.  
  Address [Prieto, Pablo; Briede, Juan C.] Univ Tecn Federico Santa Maria, Engn Design Dept, Valparaiso, Chile, Email: pablo.prieto@usm.cl  
  Corporate Author Thesis  
  Publisher Taylor & Francis Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2165-0349 ISBN Medium  
  Area ESCI Expedition Conference  
  Notes WOS:000492377800001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1059  
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Author Raux, P.S.; Gravelle, S.; Dumais, J. doi  openurl
  Title Design of a unidirectional water valve in Tillandsia Type Journal Article
  Year 2020 Publication Nature Communications Abbreviated Journal Nat. Commun.  
  Volume 11 Issue 1 Pages 7 pp  
  Keywords  
  Abstract The bromeliad Tillandsia landbeckii thrives in the Atacama desert of Chile using the fog captured by specialized leaf trichomes to satisfy its water needs. However, it is still unclear how the trichome of T. landbeckii and other Tillandsia species is able to absorb fine water droplets during intermittent fog events while also preventing evaporation when the plant is exposed to the desert's hyperarid conditions. Here, we explain how a 5800-fold asymmetry in water conductance arises from a clever juxtaposition of a thick hygroscopic wall and a semipermeable membrane. While absorption is achieved by osmosis of liquid water, evaporation under dry external conditions shifts the liquid-gas interface forcing water to diffuse through the thick trichome wall in the vapor phase. We confirm this mechanism by fabricating artificial composite membranes mimicking the trichome structure. The reliance on intrinsic material properties instead of moving parts makes the trichome a promising basis for the development of microfluidics valves.  
  Address [Raux, Pascal S.; Gravelle, Simon; Dumais, Jacques] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Vina Del Mar, Chile, Email: jacques.dumais@uai.cl  
  Corporate Author Thesis  
  Publisher Nature Publishing Group Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-1723 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000512537400017 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1101  
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Author Reszka, P.; Cruz, J.J.; Valdivia, J.; Gonzalez, F.; Rivera, J.; Carvajal, C.; Fuentes, A. doi  openurl
  Title Ignition delay times of live and dead pinus radiata needles Type Journal Article
  Year 2020 Publication Fire Safety Journal Abbreviated Journal Fire Saf. J.  
  Volume 112 Issue Pages 7 pp  
  Keywords Leaf senescence; Photosynthetic pigments; Critical heat flux; Moisture content; Wildland fire  
  Abstract There are still many open questions related to the fire behavior of live and dead wildland fuels and their senescence process. We have physically and biochemically studied live and dead pinus radiata needles, their aging process, and their fire behavior using a systematic aging procedure which allows to characterize the evolution of the fuel moisture content and the photosynthetic pigments over time, and to determine the period of time after sample collection in which specimens can be considered to be alive. Results show that pine needles stay alive for up to 12 h after collection if they remain attached to the twigs. The influence of senescence on spontaneous ignition was tested on two bench-scale devices, the I-FIT and the SCALA, under discontinuous and continuous configurations, respectively. Live pine needles showed larger critical heat fluxes than dead needles, while dead and re-hydrated samples have increased critical heat fluxes for greater moisture contents. Experimental results were interpreted with thermal models based on a two-phase description of the fuel layer. We established a correlation of the form 1/t(ig)proportional to q(inc)" for both ignition configurations, which is adequate for engineering applications and allows the estimation of effective properties for wildland fuel beds.  
  Address [Reszka, P.; Valdivia, J.] Univ Adolfo Ibanez, Fac Engn & Sci, Santiago, Chile, Email: andres.fuentes@usm.cl  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0379-7112 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000527282900005 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1146  
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Author Reus, L. doi  openurl
  Title Efficient selection of copper sales contracts for small- and medium-sized mining Type Journal Article
  Year 2020 Publication Managerial And Decision Economics Abbreviated Journal Manag. Decis. Econ.  
  Volume 41 Issue 4 Pages 624-630  
  Keywords  
  Abstract The purpose of this study is to generate efficient policies for the selection and postponement of copper sales contracts by a mining company. To do so, it uses a two-stage stochastic programming model that determines solutions considering different contract types, random prices, and risk aversion. The results show how it is possible for the selection to involve the lowest risk possible for different revenue levels required. During a period of high price volatility, an efficient solution may deliver an increase in monthly revenue of US$210,000 for a mining company that produces 50,000 tons per year, without any additional risk.  
  Address [Reus, Lorenzo] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Diagonal Torres 2640, Santiago, Chile, Email: lorenzo.reus@uai.cl  
  Corporate Author Thesis  
  Publisher John Wiley & Sons Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0143-6570 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000531412600012 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1138  
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Author Reus, L.; Fabozzi, F.J. doi  openurl
  Title Robust Solutions to the Life-Cycle Consumption Problem Type Journal Article
  Year 2020 Publication Computational Economics Abbreviated Journal Comput. Econ.  
  Volume to appear Issue Pages  
  Keywords  
  Abstract This paper demonstrates how the well-known discrete life-cycle consumption problem (LCP) can be solved using the Robust Counterpart (RC) formulation technique, as defined in Ben-Tal and Nemirovski (Math Oper Res 23(4):769-805, 1998). To do this, we propose a methodology that involves applying a change of variables over the original consumption before deriving the RC. These transformations allow deriving a closed solution to the inner problem, and thus to solve the LCP without facing the curse of dimensionality and without needing to specify the prior distribution for the investment opportunity set. We generalize the methodology and illustrate how it can be used to solve other type of problems. The results show that our methodology enables solving long-term instances of the LCP (30 years). We also show it provides an alternative consumption pattern as to the one provided by a benchmark that uses a dynamic programming approach. Rather than finding a consumption that maximizes the expected lifetime utility, our solution delivers higher utilities for worst-case scenarios of future returns.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0927-7099 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Reus2020 Serial 1086  
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Author Reus, L.; Carrasco, J.A.; Pincheira, P. doi  openurl
  Title Do it with a smile: Forecasting volatility with currency options Type Journal Article
  Year 2020 Publication Finance Research Letters Abbreviated Journal Financ. Res. Lett.  
  Volume 34 Issue Pages 10 pp  
  Keywords Volatility forecast; Volatility smile; Latin American markets; Currency options  
  Abstract We show that traditional measures of curvature and symmetry of the “smiles” improve volatility predictions in forex markets. We consider post crisis data at a daily basis for seven currencies vis a vis the American dollar: The British pound, the Euro, the Australian dollar, the Japanese yen, the Brazilian real and the Mexican and Chilean peso. While our results are robust to the option currency and maturity, they are particularly strong for latin-American currencies and options with longer maturity. We find that the simultaneous inclusion of skewness and kurtosis to a forecasting model significantly improves its predictive accuracy.  
  Address [Reus, Lorenzo; Carrasco, Jose A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 2640, Chile, Email: lorenzo.reus@uai.cl;  
  Corporate Author Thesis  
  Publisher Academic Press Inc Elsevier Science Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1544-6123 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000551346400022 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1209  
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Author Rezakhah, M.; Moreno, E.; Newman, A. pdf  doi
openurl 
  Title Practical performance of an open pit mine scheduling model considering blending and stockpiling Type Journal Article
  Year 2020 Publication Computers & Operations Research Abbreviated Journal Comput. Oper. Res.  
  Volume 115 Issue Pages 12 pp  
  Keywords Stockpiling; Linear and integer programming; Mine planning; Open pit mining; Software  
  Abstract Open pit mine production scheduling (OPMPS) is a decision problem which seeks to maximize net present value (NPV) by determining the extraction time of each block of ore and/or waste in a deposit and the destination to which this block is sent, e.g., a processing plant or waste dump. Spatial precedence constraints are imposed, as are resource capacities. Stockpiles can be used to maintain low-grade ore for future processing, to store extracted material until processing capacity is available, and/or to blend material based on single or multiple block characteristics (i.e., metal grade and/or contaminant). We adapt an existing integer-linear program to an operational polymetallic (gold and copper) open pit mine, in which the stockpile is used to blend materials based on multiple block characteristics, and call it ((P) over cap (la)). We observe that the linear programming relaxation of our objective function is unimodal for different grade combinations (metals and contaminants) in the stockpile, which allows us to search systematically for an optimal grade combination while exploiting the linear structure of our optimization model. We compare the schedule of ((P) over cap (la)) with that produced by (P-ns) which does not consider stockpiling, and with ((P) over tilde (la)), which controls only the metal content in the stockpile and ignores the contaminant level at the mill and in the stockpile. Our proposed solution technique provides schedules for large instances in a few seconds up to a few minutes with significantly different stockpiling and material flow strategies depending on the model. We show that our model improves the NPV of the project while satisfying operational constraints. (C) 2019 Elsevier Ltd. All rights reserved.  
  Address [Rezakhah, Mojtaba] Tarbiat Modares Univ, Engn Dept, POB 14115411, Tehran, Iran, Email: m.rezakhah@modares.ac.ir;  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0305-0548 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000514218600009 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1161  
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Author Ritt, M.; Pereira, J. doi  openurl
  Title Heuristic and exact algorithms for minimum-weight non-spanning arborescences Type Journal Article
  Year 2020 Publication European Journal Of Operational Research Abbreviated Journal Eur. J. Oper. Res.  
  Volume 287 Issue 1 Pages 61-75  
  Keywords Minimum-weight non-spanning arborescence; Heuristic; Iterated Local Search; Branch-and-cut  
  Abstract We address the problem of finding an arborescence of minimum total edge weight rooted at a given vertex in a directed, edge-weighted graph. If the arborescence must span all vertices the problem is solvable in polynomial time, but the non-spanning version is NP-hard. We propose reduction rules which determine vertices that are required or can be excluded from optimal solutions, a modification of Edmonds algorithm to construct arborescences that span a given set of selected vertices, and embed this procedure into an iterated local search for good vertex selections. Moreover, we propose a cutset-based integer linear programming formulation, provide different linear relaxations to reduce the number of variables in the model and solve the reduced model using a branch-and-cut approach. We give extensive computational results showing that both the heuristic and the exact methods are effective and obtain better solutions on instances from the literature than existing approaches, often in much less time. (C) 2020 Elsevier B.V. All rights reserved.  
  Address [Ritt, Marcus] Univ Fed Rio Grande do Sul, Inst Informat, Av Bento Goncalves 9500, Porto Alegre, RS, Brazil, Email: marcus.ritt@inf.ufrgs.br;  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0377-2217 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000541072800005 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1187  
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Author Rivera Letelier, O.; Espinoza, D.; Goycoolea, M.; Moreno, E.; Munoz, G. doi  openurl
  Title Production scheduling for strategic open pit mine planning: A mixed integer programming approach Type Journal Article
  Year 2020 Publication Operations Research Abbreviated Journal Oper. Res.  
  Volume to appear Issue Pages  
  Keywords  
  Abstract Given a discretized representation of an ore body known as a block model, the open pit mining production scheduling problem that we consider consists of defining which blocks to extract, when to extract them, and how or whether to process them, in such a way as to comply with operational constraints and maximize net present value. Although it has been established that this problem can be modeled with mixed-integer programming, the number of blocks used to represent real-world mines (millions) has made solving large instances nearly impossible in practice. In this article, we introduce a new methodology for tackling this problem and conduct computational tests using real problem sets ranging in size from 20,000 to 5,000,000 blocks and spanning 20 to 50 time periods. We consider both direct block scheduling and bench-phase scheduling problems, with capacity, blending, and minimum production constraints. Using new preprocessing and cutting planes techniques, we are able to reduce the linear programming relaxation value by up to 33\%, depending on the instance. Then, using new heuristics, we are able to compute feasible solutions with an average gap of 1.52% relative to the previously computed bound. Moreover, after four hours of running a customized branch-and-bound algorithm on the problems with larger gaps, we are able to further reduce the average from 1.52% to 0.71%  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0030-364X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1052  
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Author Romero-Romero, J.L.; Inostroza-Blancheteau, C.; Reyes-D?az, M.; Matte, J.P.; Aquea, F.; Espinoza, C.; Gil, P.M.; Arce-johnson, P. doi  openurl
  Title Increased Drought and Salinity Tolerance in Citrus aurantifolia (Mexican Lemon) Plants Overexpressing Arabidopsis CBF3 Gene Type Journal Article
  Year 2020 Publication Journal Of Soil Science And Plant Nutrition Abbreviated Journal J. Soil Sci. Plant Nutr.  
  Volume 20 Issue 1 Pages 244-252  
  Keywords Drought tolerance; Abiotic stress; Transgenics citrus; CBF3 transcription factor  
  Abstract Citrus are a globally important fruit crop. Abiotic stressors such as drought and salinity adversely affect physiological citrus performance and survival. With the aim of improving drought tolerance in citrus plants, we constructed transgenic lines of Citrus lemon overexpressing the Arabidopsis transcription factor CBF3. Molecular, physiological, and quantitative real-time analyses showed high expression of AtCBF3 in three selected transgenic lines. During a 15-day treatment of water deficit by cessation of irrigation, the transgenic lines LM2 and LM14 showed lower stomatal conductance and transpiration paired with lower photosynthesis, whereas transgenic line LM7 maintained its photosynthesis, declining stomatal conductance, and transpiration compared to WT plants, which is manifested into more efficient water use. The genes CsRafS1 and CsGolS1 showed similar or greater expression in one of the transgenic lines with respect to control plants. Moreover, transgenic lines were more tolerant to saline stress and presented a greener phenotype with increased chlorophyll content in leaf discs compared to WT plants. In addition, a lower electrical conductivity in solution was observed in transgenic lines. Furthermore, all transgenic lines exhibited significantly less accumulation of reactive oxygen species than WT plants. Together, these results suggest the potential for heterologous expression of the AtCBF3 gene to mediate tolerance to hydric and saline stress in citrus plants.  
  Address [Romero-Romero, Jesus L.] CIIIDIR, Inst Politecn Nacl, Dept Biotecnol Agr, Unidad Sinaloa, Guasave, Sinaloa, Mexico, Email: parce@bio.puc.cl  
  Corporate Author Thesis  
  Publisher Springer International Publishing Ag Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0718-9508 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000520138000021 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1158  
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Author Ruivo, E.L.P.; de Oliveira, P.P.B.; Montalva-Medel, M.; Perrot, K. openurl 
  Title Maximum sensitivity to update schedules of elementary cellular automata over infinite configurations Type Journal Article
  Year 2020 Publication Information and Computation Abbreviated Journal  
  Volume to appear Issue Pages  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0890-5401 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1122  
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Author Ruz, G.A.; Henriquez, P.A.; Mascareno, A. doi  openurl
  Title Sentiment analysis of Twitter data during critical events through Bayesian networks classifiers Type Journal Article
  Year 2020 Publication Future Generation Computer Systems-The International Journal Of Escience Abbreviated Journal Futur. Gener. Comp. Syst.  
  Volume 106 Issue Pages 92-104  
  Keywords Bayesian network classifiers; Twitter data; Sentiment analysis; Bayes factor; Support vector machines; Random forests  
  Abstract Sentiment analysis through machine learning using Twitter data has become a popular topic in recent years. Here we address the problem of sentiment analysis during critical events such as natural disasters or social movements. We consider Bayesian network classifiers to perform sentiment analysis on two datasets in Spanish: the 2010 Chilean earthquake and the 2017 Catalan independence referendum. In order to automatically control the number of edges that are supported by the training examples in the Bayesian network classifier, we adopt a Bayes factor approach for this purpose, yielding more realistic networks. The results show the effectiveness of using the Bayes factor measure as well as its competitive predictive results when compared to support vector machines and random forests, given a sufficient number of training examples. Also, the resulting networks allow to identify the relations amongst words, offering interesting qualitative information to historically and socially comprehend the main features of the event dynamics. (C) 2020 Elsevier B.V. All rights reserved.  
  Address [Ruz, Gonzalo A.; Henriquez, Pablo A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: gonzalo.ruz@uai.cl;  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0167-739x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000527320000009 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1145  
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Author Sanchez, R.; Nieto-Jimenez, C. url  openurl
  Title Uso de dispositivos digitales en el seguimiento de un Trail Runner. Estudio de caso (Use of digital devices to follow a Trail Runner. Case study) Type Journal Article
  Year 2020 Publication Retos Abbreviated Journal Retos  
  Volume 38 Issue Pages 582-586  
  Keywords Trail Runners, Tecnologías digitales, Parámetros de carrera, plataformas digitales.  
  Abstract The aim of this study is to describe a tracking methodology for a Trail Running (TR) athlete during five years through the capture of data from digital devices, associating the race pace and speed with the terrain slope. The trajectories generated by the global positioning system (GPS) were obtained from the Strava platform. From this information, measurements of horizontal distance, elevation gain, slope, horizontal speed, and vertical speed are made. In order to analyze the entire data spectrum the Tobler model was calibrated using a quantile regression. For each training week data from 8 previous weeks was used, and model parameters were extracted for each decile, P0: minimum rhythm; m1: critical angle, C + (relative cost of running uphill) and C-(relative cost of running downhill). We conclude that capturing daily data through digital devices is a useful way to obtain information on the association between race pace and slope. A quantile regression model could be useful for the design of training programs for a TR athlete.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1579-1726 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1135  
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Author Sanchez, R.; Villena, M. doi  openurl
  Title Comparative evaluation of wearable devices for measuring elevation gain in mountain physical activities Type Journal Article
  Year 2020 Publication Proceedings Of The Institution Of Mechanical Engineers Part P-Journal Of Sports Engineering And Technology Abbreviated Journal Proc. Inst. Mech. Eng. Part P-J. Sport. Eng. Technol.  
  Volume to appear Issue Pages 8 pp  
  Keywords Mountain running; physical workload; altitude; measuring; validity; GPS; barometric device  
  Abstract The aim of this article is to examine the validity of elevation gain measures in mountain activities, such as hiking and mountain running, using different wearable devices and post-processing procedures. In particular, a total of 202 efforts were recorded and evaluated using three standard devices: GPS watch, GPS watch with barometric altimeter, and smartphone. A benchmark was based on orthorectified aerial photogrammetric survey conducted by the Chilean Air Force. All devices presented considerable elevation gain measuring errors, where the barometric device consistently overestimated elevation gain, while the GPS devices consistently underestimated elevation gain. The incorporation of secondary information in the post-processing can substantially improve the elevation gain measuring accuracy independently of the device and altitude measuring technology, reducing the error from -5% to -1%. These results could help coaches and athletes correct elevation gain estimations using the proposed technique, which would serve as better estimates of physical workload in mountain physical activities.  
  Address [Sanchez, Raimundo; Villena, Marcelo] Adolfo Ibanez Univ, Fac Engn & Sci, Diagonal Las Torres 2640, Santiago 7910000, Chile, Email: raimundo.sanchez@uai.cl  
  Corporate Author Thesis  
  Publisher Sage Publications Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1754-3371 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000534320000001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1201  
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Author Soto, P.C.; Cartes, C.; Davies, T.P.; Olivari, J.; Rica, S.; Vogt-Geisse, K. doi  openurl
  Title The anatomy of the 2019 Chilean social unrest Type Journal Article
  Year 2020 Publication Chaos Abbreviated Journal Chaos  
  Volume 30 Issue 7 Pages 14 pp  
  Keywords  
  Abstract We analyze the 2019 Chilean social unrest episode, consisting of a sequence of events, through the lens of an epidemic-like model that considers global contagious dynamics. We adjust the parameters to the Chilean social unrest aggregated public data available from the Undersecretary of Human Rights and observe that the number of violent events follows a well-defined pattern already observed in various public disorder episodes in other countries since the 1960s. Although the epidemic-like models display a single event that reaches a peak followed by an exponential decay, we add standard perturbation schemes that may produce a rich temporal behavior as observed in the 2019 Chilean social turmoil. Although we only have access to aggregated data, we are still able to fit it to our model quite well, providing interesting insights on social unrest dynamics.  
  Address [Soto, Pauline Caroca; Olivari, Jocelyn; Rica, Sergio; Vogt-Geisse, Katia] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Avda Diagonal Torres 2640, Santiago, Chile, Email: jocelyn.olivari@uai.cl  
  Corporate Author Thesis  
  Publisher Amer Inst Physics Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1054-1500 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000554870700001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1214  
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Author Soto, V.; Saez, E.; Magna-Verdugo, C. pdf  doi
openurl 
  Title Numerical modeling of 3D site-city effects including partially embedded buildings using spectral element methods. Application to the case of Viña del Mar city, Chile. Type Journal Article
  Year 2020 Publication Engineering Structures Abbreviated Journal Eng. Struct.  
  Volume 223 Issue Pages 111188  
  Keywords  
  Abstract In recent years, seismic wave propagation analyses have become a powerful tool to evaluate the site effects in a given region. Among several approaches, Spectral Element Method (SEM) has been widely used with that purpose because its flexibility and computational efficiency. In addition to other effects than basin shape, material nonlinearity and heterogeneity, the multiple interactions between the soil and structures, denominated site-city effects (SCI), can play a crucial role in densely populated areas. There are many options to model this kind of interaction, especially if the buildings are partially embedded on the soil. This paper evaluates the importance of the proper SCI modeling against more standard uncoupled approaches, focusing on the local interaction between the soil and a group of buildings including inelastic soil behavior. We focus our work on the case of downtown Viña del Mar, a touristic coastal city of central Chile, where the observation of a reiterated distribution of damage in reinforced concrete buildings during two major earthquakes has motivated numerous studies. For that purpose, a realistic 3D numerical model of the area is created, considering the existing buildings and using micro-vibration as a main calibration tool. The open-source code SPEED was used to perform the wave propagation simulation, which combines the spectral element method with a discontinuous Galerkin approach. A geophysical study was conducted to estimate the model parameters, shear modulus degradation and damping curves are extracted from laboratory tests to account for the non-linearity of the soil. In general, the results indicate that the inclusion of the SCI is beneficial to the structure's response in most cases, and that SCI modeling needs to considerate the level of embedment to obtain more precise results. Indeed, in buildings of 12 or more stories, the response would not be affected by the level of embedding of the base and the inclusion of site-city effects is beneficial, while for buildings lower than 5 stories, the total embedment of the base generates a significant decrease of the response.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0141-0296 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1206  
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Author Timmermann, T.; Gonzalez, B.; Ruz, G.A. doi  openurl
  Title Reconstruction of a gene regulatory network of the induced systemic resistance defense response in Arabidopsis using boolean networks Type Journal Article
  Year 2020 Publication Bmc Bioinformatics Abbreviated Journal BMC Bioinformatics  
  Volume 21 Issue 1 Pages 16 pp  
  Keywords Boolean networks; Differential evolution; Gene regulatory networks; Induced systemic resistance; Paraburkholderia phytofirmans; Pseudomonas syringae  
  Abstract Background An important process for plant survival is the immune system. The induced systemic resistance (ISR) triggered by beneficial microbes is an important cost-effective defense mechanism by which plants are primed to an eventual pathogen attack. Defense mechanisms such as ISR depend on an accurate and context-specific regulation of gene expression. Interactions between genes and their products give rise to complex circuits known as gene regulatory networks (GRNs). Here, we explore the regulatory mechanism of the ISR defense response triggered by the beneficial bacterium Paraburkholderia phytofirmans PsJN in Arabidopsis thaliana plants infected with Pseudomonas syringae DC3000. To achieve this, a GRN underlying the ISR response was inferred using gene expression time-series data of certain defense-related genes, differential evolution, and threshold Boolean networks. Results One thousand threshold Boolean networks were inferred that met the restriction of the desired dynamics. From these networks, a consensus network was obtained that helped to find plausible interactions between the genes. A representative network was selected from the consensus network and biological restrictions were applied to it. The dynamics of the selected network showed that the largest attractor, a limit cycle of length 3, represents the final stage of the defense response (12, 18, and 24 h). Also, the structural robustness of the GRN was studied through the networks' attractors. Conclusions A computational intelligence approach was designed to reconstruct a GRN underlying the ISR defense response in plants using gene expression time-series data of A. thaliana colonized by P. phytofirmans PsJN and subsequently infected with P. syringae DC3000. Using differential evolution, 1000 GRNs from time-series data were successfully inferred. Through the study of the network dynamics of the selected GRN, it can be concluded that it is structurally robust since three mutations were necessary to completely disarm the Boolean trajectory that represents the biological data. The proposed method to reconstruct GRNs is general and can be used to infer other biologically relevant networks to formulate new biological hypotheses.  
  Address [Timmermann, Tania; Gonzalez, Bernardo; Ruz, Gonzalo A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Lab Bioingn, Santiago, Chile, Email: gonzalo.ruz@uai.cl  
  Corporate Author Thesis  
  Publisher Bmc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1471-2105 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000529043500003 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1143  
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Author Travisany, D.; Goles, E.; Latorre, M.; Cort?s, M.P.; Maass, A. doi  openurl
  Title Generation and robustness of Boolean networks to model Clostridium difficile infection Type Journal Article
  Year 2020 Publication Natural Computing Abbreviated Journal Nat. Comput.  
  Volume 19 Issue 1 Pages 111-134  
  Keywords Threshold network; Neutral space; Evolutionary computation; Microbiome; Clostridium difficile infection  
  Abstract One of the more common healthcare associated infection is Chronic diarrhea. This disease is caused by the bacterium Clostridium difficile which alters the normal composition of the human gut flora. The most successful therapy against this infection is the fecal microbial transplant (FMT). They displace C. difficile and contribute to gut microbiome resilience, stability and prevent further episodes of diarrhea. The microorganisms in the FMT their interactions and inner dynamics reshape the gut microbiome to a healthy state. Even though microbial interactions play a key role in the development of the disease, currently, little is known about their dynamics and properties. In this context, a Boolean network model for C. difficile infection (CDI) describing one set of possible interactions was recently presented. To further explore the space of possible microbial interactions, we propose the construction of a neutral space conformed by a set of models that differ in their interactions, but share the final community states of the gut microbiome under antibiotic perturbation and CDI. To begin with the analysis, we use the previously described Boolean network model and we demonstrate that this model is in fact a threshold Boolean network (TBN). Once the TBN model is set, we generate and use an evolutionary algorithm to explore to identify alternative TBNs. We organize the resulting TBNs into clusters that share similar dynamic behaviors. For each cluster, the associated neutral graph is constructed and the most relevant interactions are identified. Finally, we discuss how these interactions can either affect or prevent CDI.  
  Address [Travisany, Dante; Goles, Eric] Univers Adolfo Ibanez, Facultad Ingn Ciencias, Santiago, Chile, Email: dtravisany@dim.uchile.cl  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1567-7818 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000517129300008 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1167  
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Author Ugalde, D.; Lopez-Garcia, D.; Parra, P.F. doi  openurl
  Title Fragility-based analysis of the influence of effective stiffness of reinforced concrete members in shear wall buildings Type Journal Article
  Year 2020 Publication Bulletin Of Earthquake Engineering Abbreviated Journal Bull. Earthq. Eng.  
  Volume 18 Issue 5 Pages 2061-2082  
  Keywords Wall buildings; Shear stiffness; Bending stiffness; Fragility curves; Pushover analysis; SPO2FRAG  
  Abstract When modeling RC shear wall buildings for seismic analysis there is little consensus in the literature on the appropriate value of the wall effective shear stiffness (GA(eff)) and the slab effective bending stiffness (EIeff). A probabilistic analysis based on fragility curves is a robust technique to assess the influence of these parameters on the expected seismic performance, but such studies are scarce because they require computationally expensive analysis such as Incremental Dynamic Analysis (IDA). In this paper, fragility curves are developed following the recently introduced SPO2FRAG procedure, a simplified methodology that does not require IDA but the computationally more affordable incremental static (pushover) analysis. The fragility curves provided by SPO2FRAG are used to evaluate the influence of the values of GA(eff) and EIeff on the analytical seismic response of full 3D nonlinear models of two actual (and representative) residential wall buildings of 17 and 26 stories located in Santiago (Chile). The accuracy of SPO2FRAG is also evaluated through comparisons with empirical fragilities.  
  Address [Ugalde, David; Lopez-Garcia, Diego] Pontificia Univ Catolica Chile, Dept Struct & Geotech Engn, Av Vicuna Mackenna 4860 Macul, Santiago 7820436, RM, Chile, Email: dgugalde@uc.cl;  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1570-761x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000518844200010 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1137  
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