Recent Submissions

  • Peruvian undergraduate students' usage of digital technology in academic context

    Gallardo-Echenique, Eliana; Bullen, Mark; Castillo, Andrea (Institute of Electrical and Electronics Engineers Inc., 2020-03-01)
    This paper presents the results of an interview of first-year university students at a private face-to-face university in Lima city on how they use digital technologies in their social and academic lives. This study was positioned in the interpretive paradigm with qualitative research design. Semi-structured interview with 13 open-ended questions was selected as the means of data. Atlas.ti. were used to analysed and coded all the interviews. To provide a well-structured approach to handling a large data set, thematic analysis was employed to analyse the verbatim transcription as outlined by Braun and Clarke. Contrary to the assumption that young learners are seen as highly adept technology users, the findings show that social networks (Facebook and Instagram) and WhatsApp are the most important applications for the participants.
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  • Higher medical education facing the covid-19 infodemia

    Félix Cayo Rojas, César; Miranda Dávila, Ana Sofía (Editorial Ciencias Medicas, 2020-01-01)
    Carta al editor
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  • Predictive model to reduce the dropout rate of university students in Perú: Bayesian Networks vs. Decision Trees

    Medina, Erik Cevallos; Chunga, Claudio Barahona; Armas-Aguirre, Jimmy; Grandon, Elizabeth E. (IEEE Computer Society, 2020-06-01)
    This research proposes a prediction model that might help reducing the dropout rate of university students in Peru. For this, a three-phase predictive analysis model was designed which was combined with the stages proposed by the IBM SPSS Modeler methodology. Bayesian network techniques was compared with decision trees for their level of accuracy over other algorithms in an Educational Data Mining (EDM) scenario. Data were collected from 500 undergraduate students from a private university in Lima. The results indicate that Bayesian networks behave better than decision trees based on metrics of precision, accuracy, specificity, and error rate. Particularly, the accuracy of Bayesian networks reaches 67.10% while the accuracy for decision trees is 61.92% in the training sample for iteration with 8:2 rate. On the other hand, the variables athletic person (0.30%), own house (0.21%), and high school grades (0.13%) are the ones that contribute most to the prediction model for both Bayesian networks and decision trees.
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  • Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion

    Babalola, O. E.; Awoyera, P. O.; Tran, M. T.; Le, D. H.; Olalusi, O. B.; Viloria, A.; Ovallos-Gazabon, D. (Elsevier Editora Ltda, 2020-01-01)
    This study aimed to investigate the mechanical and durability properties of recycled aggre-gate concrete with a ternary binder system and optimized mix proportion. Two concretebatches were developed using a densified mix design approach (DMDA) to evaluate therequired mix proportions. Batch I have GGBS content varied at 0%, 10%, 20%, 30%, 40% and50% at constant w/b ratio of 0.45, while batch II concrete mix have varied water/binder ratios:0.3, 0.35, 0.4, 0.45 and 0.5 at constant GGBS replacement level of 30%. The fine aggregate(river sand) of the two batches was blended with fly ash at optimum loose packing density(FA + Sand) and superplasticizer (SP) was incorporated in the mix at a constant level of 1.4%.A control mix comprising of natural aggregate was also developed. The results obtainedshowcased the feasibility of producing structural concrete with recycled aggregates usingGGBS and fly ash. The mechanical and durability properties were best at 30% GGBS contentand 0.35 water/binder ratio. The DMDA for mix proportion adopted for RAC contributed sig-nificantly to improving its properties when compared to NAC, especially at the optimumobserved RAC mix with compressive strength of 52 MPa. Also, the mix demonstrated goodpermeability resistance in terms of chloride-ion ingress and capillary water absorption.
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  • First report of Myroides phaeus bacteraemia identified by Polymerase chain reaction and genetic sequencing

    Pérez-Lazo, G.; Morales-Moreno, A.; Soto-Febres, F.; Jove-Químper, H.; Morales-Castillo, L.; Palomares-Reyes, C.; Del Valle-Mendoza, J.; Aguilar-Luis, M.; Silva-Caso, W. (lsevier Ltd, 2020-01-01)
    We report the first case of Myroides phaeus isolated from blood, causing bacteremia in an immunocompromised patient using the automated MicroScan Walk Away 96 system, followed by bacterial identification by amplification-sequencing of the 16S rDNA. The sequences obtained were compared with the reference sequence of the BLAST ® platform - National Library of Medicine, USA, and the isolation was identified as Myroides phaeus strain with 99.67 % identity in Blast report. In the literature we did not find previous reported cases of infections by this bacterium, however its pathogenic role is still controversial; therefore, this isolation alerts us to carry out an exhaustive surveillance of other possible acquisition routes.
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  • Gut microbiota in hospitalized children with acute infective gastroenteritis caused by virus or bacteria in a regional Peruvian hospital

    Taco-Masias, Andre Alonso; Fernandez-Aristi, Augusto R.; Cornejo-Tapia, Angela; Aguilar-Luis, Miguel Angel; Del Valle, Luis J.; Silva-Caso, Wilmer; Zavaleta-Gavidia, Victor; Weilg, Pablo; Cornejo-Pacherres, Hernán; Bazán-Mayra, Jorge; Puyen, Zully M.; del Valle-Mendoza, Juana (PeerJ Inc., 2020-11-03)
    Background. Acute infective gastroenteritis (AIG) is a leading cause of mortality in children worldwide. In Peru, more than 40% of cases of AIG occurring in children under 5 years old. The disruption of the gut microbiota can increase risk for several health complications especially in patients with gastric infections caused by viruses or bacteria. Objective. The main objective of this study was to describe the prevalence of 13 representative bacteria from the gut microbiota (GM) in stools samples from children under 5 years of age with acute infective gastroenteritis. Results. The most commonly isolated bacteria from the GM were Firmicutes (63.2% 74/117) Bacteriodetes (62.4%; 73/117), Lactobacillus (59.8%; 70/117), Prevotella (57.2%; 67/117), Proteobacterium (53.8%; 63/117), regardless of the etiological agent responsible for the AIG. Interestingly, despite the high prevalence of Firmicutes, Bacteroidetes, Lactobacillus and Prevotella across all samples, a visible reduction of these agents was observed especially among patients with a single bacterial infection or even bacteria–bacteria coinfections when compared to viral etiologies. Patients with exclusive or mixed breastfeeding registered the highest amount of gut microbiota bacteria, in contrast to infants who received formula or were not breastfed.
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  • Self-Transcendent Aspirations and Life Satisfaction: The Moderated Mediation Role of Gratitude Considering Conditional Effects of Affective and Cognitive Empathy

    Oriol, Xavier; Unanue, Jesús; Miranda, Rafael; Amutio, Alberto; Bazán, César (Frontiers Media S.A., 2020-08-25)
    Life aspirations are considered one of the most relevant components for human beings to give meaning and purpose to their existence. Different studies emphasized the relevance of intrinsic life aspirations to promote life satisfaction. However, few studies analyze the specific role of the intrinsic aspirations that have been recently categorized as self-transcendent. Self-transcendent aspirations are focused on helping others and improving society and, consequently, are considered aspirations whose purpose transcends oneself. In this sense, the objective of this study is to observe how self-transcendent aspirations are related to life satisfaction through dispositional gratitude. Additionally, we aim to study the moderating role of cognitive and affective empathy. There were 1,356 students (mean age = 21.5, standard deviation = 2.35 years) who took part in a scholarship program funded by the Education Ministry of Peru (PRONABEC), of which 57.7% were men and 42.3% were women. Results show a strong relationship between self-transcendent aspirations, gratitude, and cognitive and affective empathy. In the mediation analysis, an indirect effect of self-transcendent aspirations is observed on life satisfaction via gratitude. However, the moderated mediation showed that the addition of cognitive and affective empathy conditions the mediation effect. In this way, cognitive empathy has a significant interaction in the relationships between self-transcendent aspirations and gratitude, and between self-transcendent aspirations and life satisfaction. Results are discussed to emphasize the relevance of the mediating and moderating mechanisms considered in this study for the understanding of how self-transcendent life aspirations may promote life satisfaction.
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  • Tour Leading in South America: Job Inputs and Outcomes

    Carrillo, Brendali; Barbieri, Carla; Knollenberg, Whitney; Edwards, Michael B. (SAGE Publications Ltd, 2020-09-01)
    Tour Leader’s (TLs) performance is a key determinant of tourists’ satisfaction. Yet, research on the set of rewards and stressors (job inputs) that TLs experience and how these affect their quality of life and job satisfaction (job outcomes) is scant. This study, framed within the facet analysis model, fills this knowledge gap using data collected from 82 TLs operating in South America. Respondents were satisfied with nonfinancial rewards and perceived low stress levels resulting from their jobs. Although most reported positive psychological outcomes, they also acknowledged a decrease in their quality of convivial life. Analysis indicated that job inputs significantly affected TLs’ psychological and convivial well-being and job satisfaction. Study results expand the scholarship of the inputs and outcomes of tour leading and provides managerial and policy insights to increase TLs’ quality of life and job satisfaction, which is critical to enhance job performance.
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  • The stress from my tour leading job: Differences between genders

    Carrillo, Brendali; Barbieri, Carla; Knollenberg, Whitney; Edwards, Michael B. (Elsevier Ltd, 2020-09-01)
    This study compared job stressors between female and male Tour Leaders (TLs) operating in South America, mainly Peru and Bolivia. In 2017, 82 TLs were surveyed about their level of stress on 30 items representing four sources of job stress: job roles, nature of the job, tourists’ attitudes and behaviors, and external factors. Statistical tests determined that female TLs perceive higher levels of stress from sexual harassment, natural disasters, facilitating the tourists-locals interaction, having limited free time during trips and constant packing/unpacking. Male TLs reported higher levels of stress when tourists supersede their authority. These results indicate the need to amend policy and managerial guidelines to increase gender equity in the tour leading profession.
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  • Coronal microleakage according to the temporary restorative materials used in endodontic treatment

    Prado, Luisa Stephanie Nohelya Junes; Garcia, Stefany Caballero; Salazar, Carolina Barragán; Soto, Néstor Gonzales (Editorial Ciencias Medicas, 2020-04-01)
    Introduction: Coronal microleakage caused by temporary restorative materials is viewed as one of the reasons for endodontic failure. Efforts have been made in recent years to create a temporary restorative material capable of preventing that problem. Objective: Compare in vitro coronal microleakage of an "experimental cement" and four temporary restorative materials used in endodontics. Methods: Class I cavities were made in 90 premolar teeth divided into 10 groups (n= 9) and evaluated at two time periods (1 and 2 weeks). The "experimental cement" was prepared and then coronal sealing of the teeth was performed with the experimental Cement, F (VOCO), Eugenato (MOYCO), Ketac™ Molar Easymix 3M (ESPE) and Coltosol® F. The pieces were submerged in India ink (Pelikan)for 1 and 2 weeks. Microleakage was evaluated on the interface dentin wall / temporary restoration using a stereo microscope (Leica Microsystems LAS EZ version 2.0.0). Measurement was made in millimeters using the software LAS EZ version 2.0.0. Results: Statistically significant differences were found (p< 0.05) when comparing coronal microleakage in the five temporary restorative materials according to exposure time in ink (1 and 2 weeks). Conclusions: The experimental cement had less microleakage than Coltosol® F and Ketac™ Molar EasyMix 3M (ESPE). However, none of the four materials was capable of completely preventing microleakage.
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  • Rituales corporativos y el compromiso laboral del colaborador en un banco peruano

    Chavez-Luna, Luis; Horna-Cerna, Kevin; Mäckelmann, Mathias; Gallardo-Echenique, Eliana (Associacao Iberica de Sistemas e Tecnologias de Informacao, 2020-09-01)
    This study explore the existence of a possible relationship between participation in corporate rituals and the employee commitment to the company. This case study examines the “Banco de Crédito del Perú (BCP)”. Questionnaires where designed using Microsoft Forms. A convenience sampling of 379 employees participated in this study. As revealed in the findings, there is no relationship between the employee commitment and the number of rituals in which he participates. Millennial collaborators mostly participate in only 1 to 2 rituals within the company with 27% and 31% respectively; being the Halloween contest the ritual that has the highest ratio of millennials who do not participate.
    Acceso abierto
  • Use of disruptive technologies in Peru

    Burga-Larco, Gonzalo; Vargas-Sardon, Jorge Lucas; Gallardo-Echenique, Eliana (Associacao Iberica de Sistemas e Tecnologias de Informacao, 2020-09-01)
    This paper aims to identify the perceptions of the main stakeholders of IBM about the external communication strategies that have been applied on the potential use of disruptive technologies. A qualitative methodology with a case study approach was applied. Through the homogeneous sampling technique, six semi-structured interviews with stakeholders of IBM and one focus group with 11 university students were conducted. As a result, there is interest in Peruvians to know what disruptive technologies are; however, its dissemination has a commercial focus that is not generating development or relevant solutions in the local market. It is necessary that specialists and the media disseminate information that does motivate their use in a real and effective way.
    Acceso abierto
  • The role of customer experience in the omnichannel strategy during the purchasing proces

    Castillo-Jiménez, Andrea; Gallardo-Echenique, Eliana (Associacao Iberica de Sistemas e Tecnologias de Informacao, 2020-09-01)
    Nowadays, a hyper-connected consumer is not satisfied with using only one channel of everything the brand offers, but rather looks for the diversity of options to make their purchase. This research seeks to analyze how the customer experience is during the purchase process developed in the omnichannel strategy of the department store. The study used qualitative research methods to data gathering and analysis. To best capture customer experience, semi-structured interview, using open-ended questioning, was suited to data gathering. The participants were 13 customers who consented to be interviewed. Recruitment of participants concluded when data saturation occurred. It was evident how the omnichannel strategy works in a synchronized and positive way in the department store, without any interruption to consolidate the purchase.
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  • Odotype, the olfactory identity of a brand

    Rodríguez-Díaz, María Alejandra; Gallardo-Echenique, Eliana (Associacao Iberica de Sistemas e Tecnologias de Informacao, 2020-09-01)
    Smell is one of the least used senses in advertising and/or marketing strategies. This study analyzes the conditions for the implementation of the odotype in the brand identity. A qualitative research approach and Grounded Theory method are using to develop an explanatory theory about the concept “odotype”. A semi-structured interview guide was designed according to the categories proposed in the research: odotype and brand identity. This research shows that odotype and sensorial marketing are different concepts; providing a definition for each concept. The Peruvian market is still at an early stage with respect to the aroma and odotype.
    Acceso abierto
  • Development of a hybrid system for automatic identification of brushed direct current motors

    Hamann, Franz; Mesones, Gustavo (Institute of Electrical and Electronics Engineers Inc., 2020-09-01)
    This work proposes a low-cost hybrid hardware and software system that, through a set of methods and nested while loop fitting algorithms, allows to automatically identify the electrical and mechanical parameters of a brushed direct current motor. The aim is to facilitate a tool that contributes to the development of motion control projects in which this type of actuator is used, automating and speeding up the identification process of the motor system aiming to reach 98% accuracy, in order to guarantee a good electrical and mechanical parameter estimates for the brushed direct current motor. To achieve the objective, a platform was developed consisting of a main interface programmed in Matlab and a data acquisition hardware based on a single-phase incremental optical encoder, an H-bridge, an optocoupler circuit, and a C language-programmed DSPIC30F2010. Both parts of the platform are interconnected through the authors' own serial communication protocol.
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  • Data collection of 3D spatial features of gestures from static peruvian sign language alphabet for sign language recognition

    Nurena-Jara, Roberto; Ramos-Carrion, Cristopher; Shiguihara-Juarez, Pedro (Institute of Electrical and Electronics Engineers Inc., 2020-10-21)
    Peruvian Sign Language Recognition (PSL) is approached as a classification problem. Previous work has employed 2D features from the position of hands to tackle this problem. In this paper, we propose a method to construct a dataset consisting of 3D spatial positions of static gestures from the PSL alphabet, using the HTC Vive device and a well-known technique to extract 21 keypoints from the hand to obtain a feature vector. A dataset of 35, 400 instances of gestures for PSL was constructed and a novel way to extract data was stated. To validate the appropriateness of this dataset, a comparison of four baselines classifiers in the Peruvian Sign Language Recognition (PSLR) task was stated, achieving 99.32% in the average in terms of F1 measure in the best case.
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  • Low cost semi-industrial 3GDL CNC vertical milling center design with non-ferrous metal machining capability

    Shimabukuro, Satoshi; Diaz, Piero; Vinces, Leonardo (Institute of Electrical and Electronics Engineers Inc., 2020-09-01)
    This work proposes the design of a low cost semi-industrial three degree of freedom CNC vertical milling center (VMC) with non-ferrous metal machining capabilities. The design seeks to mitigate the difficulties that acquiring a commercial industrial CNC can present, such as large dimensions, high cost and complications in its transportation within the plant. The proposed machine will be made up of 1 NEMA 23 stepper motor for each X, Y and Z axis, and will be controlled by open source firmware using an ATMEGA 2560 microcontroller. Likewise, the working area will be 320x180mm and will have a precision 100 microns with semi industrial capacities. This design is aimed at small and medium-sized companies that are looking for a low cost non-ferrous CNC milling machine that in turn has the quality, performance and precision of an industrial one.
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  • DPF: App for diagnosing the psychological profile of a possible feminicide

    Ramirez, Ivette; Mauricio, David (Institute of Electrical and Electronics Engineers Inc., 2020-03-01)
    The most visible expression of violence against women is feminicide. The majority of feminicide cases are committed by the partner or former partner of the victim. This involves ongoing domestic abuses, threats or intimidation, sexual violence or situations in which women have less energy or resources than their partner. In addition, clinics, public hospitals or private health institutes have mental health evaluation processes, however, these flows are usually carried out in several sessions, which causes a delay in the diagnosis. In this article, a mobile application that supports psychologists or psychiatrists during the process of the psychological profile diagnosis is proposed. The system contains a questionnaire and psychological tests, in this way, based on the patient responses, indicators, and metrics, the psychological profile of the assailant is obtained as a result. The use of the system in 40 patients shows that the selection times and the psychological test qualification have improved, as well as the interpretation of the results and the total process of diagnosis, which, when obtained at opportune time, allows specialists to prevent the victim from a possible feminicide.
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  • Mobile solution to optimize process for healthcare delivery referral in pediatric patients with a presumptive cancer diagnosis

    Francia Bacilio, Eduardo Alberto; Perez Rosas, Joseph Steven; Armas-Aguirre, Jimmy (Institute of Electrical and Electronics Engineers Inc., 2020-10-21)
    In this paper, we propose a mobile solution to optimize the medical referral process for pediatric patients with presumptive cancer diagnosis. This proposal allows the automation of the process through the identification of the main gaps that are covered by the following functionalities: (1) Registration and interaction of the actors in the process, (2) Support for timely diagnosis with first-hand information, (3) Creation of request tickets and personalized medical appointments, and (4) Creation of reports on the response time and compliance with the process. The proposal is described in three sections: (1) The automation of the medical referral process, (2) The functionalities of the mobile solution, and (3) the designed technology architecture. The validation of the proposal was carried out in a social health insurance in Lima-Peru, with data and information of the process obtained by the institution. The measurement was made through the mobile solution which allowed obtaining the response times of the process with the main actors such as the pediatric doctor, an oncology specialist and a pediatric patient's guardian. The results showed that the time of the referral process is optimized between an interval of [95%-97.5%], which mainly generates a social benefit to the community by assuring a timely treatment of the pediatric cancer patient, based on diagnosis and early care.
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  • Feature Extraction with Video Summarization of Dynamic Gestures for Peruvian Sign Language Recognition

    Neyra-Gutierrez, Andre; Shiguihara-Juarez, Pedro (Institute of Electrical and Electronics Engineers Inc., 2020-09-01)
    In peruvian sign language (PSL), recognition of static gestures has been proposed earlier. However, to state a conversation using sign language, it is also necessary to employ dynamic gestures. We propose a method to extract a feature vector for dynamic gestures of PSL. We collect a dataset with 288 video sequences of words related to dynamic gestures and we state a workflow to process the keypoints of the hands, obtaining a feature vector for each video sequence with the support of a video summarization technique. We employ 9 neural networks to test the method, achieving an average accuracy ranging from 80% and 90%, using 10 fold cross-validation.
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