Playa Ancha University of Educational Sciences

www.upla.cl
Valparaiso, Chile

Playa Ancha University of Educational science is a university in Chile. It is a derivative university part of the Chilean Traditional Universities, belonging to the select group of twenty five rector's Council universities. The university has on two campuses: the major one in Valparaíso on Calle Playa Ancha 850 and the second one in San Felipe.The university has a vast tradition in the education area and is deeply involved with the community of Valparaiso and San Felipe. Wikipedia.


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Rusu V.,Playa Ancha University of Educational Sciences | Rusu C.,Pontifical Catholic University of Valparaíso | Guzman D.,Pontifical Catholic University of Valparaíso | Espinoza D.,Pontifical Catholic University of Valparaíso | And 3 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Usability is a key concept that refers not only to software systems, but also to products and services. User eXperience (UX) extends the usability concept. The broader concept of Customer eXperience (CX) is emerging. There are well established usability evaluation methods, but evaluating UX is more challenging. UX evaluation methods are also able to evaluate some CX aspects; some others require specific methods. The paper analyzes quantitative data on customers’ opinion, freely available at two virtual travel agencies’ websites. © Springer International Publishing Switzerland 2016.


Inostroza R.,Pontifical Catholic University of Valparaíso | Rusu C.,Pontifical Catholic University of Valparaíso | Roncagliolo S.,Pontifical Catholic University of Valparaíso | Rusu V.,Playa Ancha University of Educational Sciences | Collazos C.A.,University of Cauca
Computer Standards and Interfaces | Year: 2016

The smartphone market is nowadays highly competitive. When buying a new device, users focus on visual esthetics, ergonomics, performance, and user experience, among others. Assessing usability issues allows improving these aspects. One popular method for detecting usability problems is heuristic evaluation, in which evaluators employ a set of usability heuristics as guide. Using proper heuristics is highly relevant. In this paper we present SMASH, a set of 12 usability heuristics for smartphones and mobile applications, developed iteratively. SMASH (previously named TMD: Usability heuristics for Touchscreen-based Mobile Devices) was experimentally validated. The results support its utility and effectiveness. © 2015 Elsevier B.V. All rights reserved.


Del Pino F.,University of Chile | Jara C.,University of Chile | Pino L.,University of Chile | Medina-Munoz M.C.,Playa Ancha University of Educational Sciences | And 2 more authors.
PLoS ONE | Year: 2015

We investigated the role of Drosophila larva olfactory system in identification of congeners and aliens. We discuss the importance of these activities in larva navigation across substrates, and the implications for allocation of space and food among species of similar ecologies. Wild type larvae of cosmopolitan D. melanogaster and endemic D. pavani, which cohabit the same breeding sites, used species-specific volatiles to identify conspecifics and aliens moving toward larvae of their species. D. gaucha larvae, a sibling species of D. pavani that is ecologically isolated from D. melanogaster, did not respond to melanogaster odor cues. Similar to D. pavani larvae, the navigation of pavani female x gaucha male hybrids was influenced by conspecific and alien odors, whereas gaucha female x pavani male hybrid larvae exhibited behavior similar to the D. gaucha parent. The two sibling species exhibited substantial evolutionary divergence in processing the odor inputs necessary to identify conspecifics. Orco (Or83b) mutant larvae of D. melanogaster, which exhibit a loss of sense of smell, did not distinguish conspecific from alien larvae, instead moving across the substrate. Syn97CS and rut larvae of D. melanogaster, which are unable to learn but can smell, moved across the substrate as well. The Orco (Or83b), Syn97CS and rut loci are necessary to orient navigation by D. melanogaster larvae. Individuals of the Trana strain of D. melanogaster did not respond to conspecific and alien larval volatiles and therefore navigated randomly across the substrate. By contrast, larvae of the Til-Til strain used larval volatiles to orient their movement. Natural populations of D. melanogaster may exhibit differences in identification of conspecific and alien larvae. Larval locomotion was not affected by the volatiles. Copyright © 2015 Del Pino et al.


Beltrami M.,Metropolitan University of Educational Sciences | Medina-Munoz M.C.,Playa Ancha University of Educational Sciences | Del Pino F.,University of Chile | Ferveur J.-F.,University of Burgundy | Godoy-Herrera R.,University of Bío Bío
PLoS ONE | Year: 2012

In the wild, larvae of several species of Drosophila develop in heterogeneous and rapidly changing environments sharing resources as food and space. In this scenario, sensory systems contribute to detect, localize and recognize congeners and heterospecifics, and provide information about the availability of food and chemical features of environments where animals live. We investigated the behavior of D. simulans and D. buzzatii larvae to chemicals emitted by conspecific and heterospecific larvae. Our goal was to understand the role of these substances in the selection of pupation sites in the two species that cohabit within decaying prickly pear fruits (Opuntia ficus-indica). In these breeding sites, larvae of D. simulans and D. buzzatii detect larvae of the other species changing their pupation site preferences. Larvae of the two species pupated in the part of the fruit containing no or few heterospecifics, and spent a longer time in/on spots marked by conspecifics rather than heterospecifics. In contrast, larvae of the two species reared in isolation from conspecifics pupated randomly over the substrate and spent a similar amount of time on spots marked by conspecifics and by heterospecifics. Our results indicate that early chemically-based experience with conspecific larvae is critical for the selection of the pupation sites in D. simulans and D. buzzatii, and that pupation site preferences of Drosophila larvae depend on species-specific chemical cues. These preferences can be modulate by the presence of larvae of the same or another species. © 2012 Beltramí et al.


Mellado M.,Federico Santa María Technical University | Madrid A.,Federico Santa María Technical University | PenA-CorteS H.,Max Planck Institute of Molecular Plant Physiology | LoPez R.,Playa Ancha University of Educational Sciences | And 2 more authors.
Journal of the Chilean Chemical Society | Year: 2013

Three anthraquinones, the well known emodin (3) and physcion (6) and the new anthraquinone glycoside emodin-8-β-D-idopyranoside (7) were isolated from leaves of Muehlenbeckia hastulata. The antioxidant activity of these compounds was measured using the DPPH assay; all three showed weaker antioxidant activity than gallic acid.


Quinones D.,Pontifical Catholic University of Valparaíso | Rusu C.,Pontifical Catholic University of Valparaíso | Roncagliolo S.,Pontifical Catholic University of Valparaíso | Rusu V.,Playa Ancha University of Educational Sciences | Collazos C.A.,University of Cauca
IEEE Latin America Transactions | Year: 2016

There are many methods to assess the usability of interactive software systems. The Heuristic evaluation is one of the methods that allow finding many usability issues, based on a set of usability principles (heuristics). However, sets of generic usability heuristics may miss domain related usability aspects. Particularly, transactional web sites have specific features which could potentially not be considered when using generic heuristics. We developed a set of usability heuristics for transactional websites, using the methodology proposed by Rusu et al. (2011). The set of heuristics was designed, validated and refined during three iterations; experimental validation indicates that it is an effective and efficient evaluation instrument. The methodology facilitated the heuristics design and specification. However, certain deficiencies were detected when applying it, so further improvements are necessary. © 2016 IEEE.


Weinstein-Oppenheimer C.R.,University of Valparaíso | Aceituno A.R.,University of Valparaíso | Brown D.I.,University of Valparaíso | Acevedo C.,Federico Santa María Technical University | And 8 more authors.
Journal of Translational Medicine | Year: 2010

Background: This manuscript reports the production and preclinical studies to examine the tolerance and efficacy of an autologous cellular gel-matrix integrated implant system (IIS) aimed to treat full-thickness skin lesions.Methods: The best concentration of fibrinogen and thrombin was experimentally determined by employing 28 formula ratios of thrombin and fibrinogen and checking clot formation and apparent stability. IIS was formed by integrating skin cells by means of the in situ gelification of fibrin into a porous crosslinked scaffold composed of chitosan, gelatin and hyaluronic acid. The in vitro cell proliferation within the IIS was examined by the MTT assay and PCNA expression. An experimental rabbit model consisting of six circular lesions was utilized to test each of the components of the IIS. Then, the IIS was utilized in an animal model to cover a 35% body surface full thickness lesion.Results: The preclinical assays in rabbits demonstrated that the IIS was well tolerated and also that IIS-treated rabbit with lesions of 35% of their body surface, exhibited a better survival rate (p = 0,06).Conclusion: IIS should be further studied as a new wound dressing which shows promising properties, being the most remarkable its good biological tolerance and cell growth promotion properties. © 2010 Weinstein-Oppenheimer et al; licensee BioMed Central Ltd.


Gonzalez J.M.M.,University of Las Palmas de Gran Canaria | De Saa Guerra Y.,University of Las Palmas de Gran Canaria | Garcia-Manso J.M.,University of Las Palmas de Gran Canaria | Arriaza E.,Playa Ancha University of Educational Sciences
International Journal of Heat and Technology | Year: 2016

Basketball game flow and its design can be described as in many others natural systems. The structure, shape and functionality evolve in time and are closely related to performance in several sports. Basketball is a collaboration-opposition sport, thus games present critical points. Non-linear local interactions among players are reflected in the score evolution, the order parameter. Some researchers often presume that scoring in basketball is a random process, meaning memoryless, described using Poisson Model. Scoring cannot be described by a unique distribution. We examined 6130 NBA games and analyzed time intervals between points and scoring dynamic. In the NBA, the most competed games are decided in the last minute, where fouls play a main role (94.02%). Both teams try to keep their advantage solely in order to reach the last minute, where a different game will be played, which can be considered as an example of Red Queen Hypothesis. We also measured the game flow through players real interactions: passes, screens and space creations. Data follow a homogeneous distribution up to a certain value, suggesting that teams resolve the situation with a few steps (diffuse flow). But, if the situation becomes more critical, the dynamics turn into a Power Law Distribution, they modify the game flow spontaneously into a Scale-Free flow (hierarchical flow). These processes take place simultaneously and continuously during game time. Therefore teams would be considered as self-organizing systems.


Beltrami M.,Metropolitan University of Educational Sciences | Medina-Munoz M.C.,University of Valparaíso | Medina-Munoz M.C.,Playa Ancha University of Educational Sciences | Arce D.,Playa Ancha University of Educational Sciences | Godoy-Herrera R.,University of Chile
Evolutionary Ecology | Year: 2010

We investigated pupa distributions of D. simulans, D. buzzatii, D. melanogaster, D. immigrans and D. hydei on a number of natural breeding sites. Pupae of all five species showed aggregated distributions, which prompted us to examine these aggregations in a more detail for two species that commonly co-occur in breeding sites, D. simulans and D. buzzatii. We found that pupae of both species tend to be aggregated in conspecific clusters. Subsequent experiments revealed that both species are attracted to the odors of other larvae, though only D. buzzatii differentiated between conspecifics and heterospecifics (they preferred conspecific). Furthermore, third instar larvae of both species preferred more alkaline substrates. Altogether, our results demonstrate that Drosophila species form conspecific pupa aggregations in natural breeding sites, and that pupation site selection depends on interactions among conspecific and heterospecific larvae and on chemical characteristics of the breeding sites. © 2009 Springer Science+Business Media B.V.


PubMed | University of Chile and Playa Ancha University of Educational Sciences
Type: Journal Article | Journal: PloS one | Year: 2015

We investigated the role of Drosophila larva olfactory system in identification of congeners and aliens. We discuss the importance of these activities in larva navigation across substrates, and the implications for allocation of space and food among species of similar ecologies. Wild type larvae of cosmopolitan D. melanogaster and endemic D. pavani, which cohabit the same breeding sites, used species-specific volatiles to identify conspecifics and aliens moving toward larvae of their species. D. gaucha larvae, a sibling species of D. pavani that is ecologically isolated from D. melanogaster, did not respond to melanogaster odor cues. Similar to D. pavani larvae, the navigation of pavani female x gaucha male hybrids was influenced by conspecific and alien odors, whereas gaucha female x pavani male hybrid larvae exhibited behavior similar to the D. gaucha parent. The two sibling species exhibited substantial evolutionary divergence in processing the odor inputs necessary to identify conspecifics. Orco (Or83b) mutant larvae of D. melanogaster, which exhibit a loss of sense of smell, did not distinguish conspecific from alien larvae, instead moving across the substrate. Syn97CS and rut larvae of D. melanogaster, which are unable to learn but can smell, moved across the substrate as well. The Orco (Or83b), Syn97CS and rut loci are necessary to orient navigation by D. melanogaster larvae. Individuals of the Trana strain of D. melanogaster did not respond to conspecific and alien larval volatiles and therefore navigated randomly across the substrate. By contrast, larvae of the Til-Til strain used larval volatiles to orient their movement. Natural populations of D. melanogaster may exhibit differences in identification of conspecific and alien larvae. Larval locomotion was not affected by the volatiles.

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