Recent Submissions

  • Serious Game for the Virtual Practice of the Emplantillado in the Constructive System of adobe with reinforced cane

    George, Centeno; Carlos, Egusquiza; David, Mauricio; Peruvian University of Applied Sciences, Lima, Perú; Peruvian University of Applied Sciences, Lima, Perú; Peruvian University of Applied Sciences, Lima, Perú (Association for Computing Machinery, 2017-12-20)
    At present, the training of university students and the specialization of professionals are accompanied by a series of educational tools based on digital environments and applications for specific areas in education; In this process of application of the technology exists a methodology called Serious Game oriented towards some specific areas like Simulation in subjects of building and construction; Since this field is new in higher education, there are not many specific applications, such as the case of emplantillado for simulation of constructions using adobes reinforced with cane. The objective of this study is to demonstrate that the Serious game methodology, oriented to the teaching the course of the Preliminary Works of the Faculty of Architecture, can improve students learning and optimize their skills for the emplantillado in construction systems using the application for iPad. The application has been tested in a group of twelve students who were part of the experimental group in relation to the execution time, attempts made and qualification obtained; In contrast to evaluate the time to solve the test for emplantillado into de groups that performed the same exercise; an ANCOVA was used to evaluate the main effects and interactions to answer the null hypothesis. This ANCOVA model for balanced cases of type III includes a covariate that is correlated with the dependent variable and means on the dependent variables adjusted due the to the effect the covariate had on it.
  • Additional results on integrals of beam eigenfunctions

    Morales, César A; Facultad de Ingeniería, Universidad Peruana de Ciencias Aplicadas, Lima, Perú (SAGE Publications Ltd, 2018-03-14)
    New simplest expression beam mode integrals are presented, including further simplifications and corrections of previous results; this type of integrals appear in computational methods in structural dynamics and vibrations of diverse structures and machines, and in aircraft dynamics methods.
  • Application of Lean Techniques to Reduce Preparation Times: Case Study of a Peruvian Plastic Company

    Silva Reyes, Alfredo Jeampiere; Salas Castro, Rosa Fernanda (Research India Publications, 2017-11)
    This article examines the problem of an increase in product returns for a company that produces plastic films for flexible packaging. Among the factors that have resulted in the increase of returned products are defects in the films caused by the poor manipulation of materials and, above all, the hard point in the coils caused by excessive extruder preparation time, causing the extrusion head to overheat as well as uneven extrusion. Extrusion is a key process in the production of plastic materials as it transforms polypropylene and additives into plastic sheets. The delay in the preparation time caused by machine operators leads to the overheating of the extrusion head and, therefore, defective products that are ultimately returned to the company by customers. In order to confront this problem, a proposal was developed using the SMED tool of Lean Manufacturing in order to reduce the preparation time of the extruder and to increase the productivity of the company. For the validation of the proposal, we simulated the system to determine the resulting reduction in extruder preparation time.
  • Organic Coffee Supply Chain Management in the San Martin Region of Peru

    Ramos Palomino, Edgar David; Hilario Meza, Slee; Robles Montes, Diego; Sotelo Raffo, Fernando; Wei Shuo, Lo (International Journal of Innovation, Management and Technology, 2017-02)
    The paper is to explore a model of supply chain management organic coffee in San Martin Region, which was by a long-term research project for organic coffee supply chain management in Peru. The investigation was consolidated with items of researchers who have experiences in the evaluation and analysis of the supply chain of agricultural products worldwide; on the other hand, it is also taken into account the risks affecting the development and fluency through whole supply chain. The contributions here is proposed model of supply chain management organic coffee is suitable for exploring external and internal problems encountered decrease the efficiency of the supply chain. The model is important to analyze and require observations of specialists to collaborate to perform basic modeling that can help solve the problems that improving processes and organizations in the coffee farmers’ cooperatives in the domestic and foreign market, and achieve recognition for their quality and sustainability in Peru.
  • Technology surveillance of the solar refrigeration by absorption/adsorption

    Merino, Jose Carlos Alvarez; Hatakeyama, Kazuo (Institute of Electrical and Electronics Engineers Inc., 2016-09)
    In order to establish networks of cooperation looking for not to duplicate research and even to make use of existing research in a remote form, it is necessary to identify and classify (around the world) the researchers and laboratories, that are researching in the topic of solar refrigeration by absorption/adsorption. The methodology consists in: i) the technology's classification, ii) technological trajectory Identification, iii) a thematic bibliographic review, and iv) patent's analysis. In this way, with the previous determination of keywords, will be identified main authors and their respective institutions. With the same keywords, are determined the licensed patents (in certain span of time). In addition, the analysis of publications, patents, and commercial products give us an opportunity to establish comparisons between prototypes and tests (in several conditions). The larger results implicate the use of actor's network and the remote access to the data and tests, for a collaborative research, overcoming the lack of laboratory resource and accelerating the knowledge acquisition
  • A Novel Steganography Technique for SDTV-H.264/AVC Encoded Video

    Di Laura, Christian; Pajuelo, Diego; Kemper, Guillermo (Hindawi Publishing Corporation, 2016-04)
    Today, eavesdropping is becoming a common issue in the rapidly growing digital network and has foreseen the need for secret communication channels embedded in digital media. In this paper, a novel steganography technique designed for Standard Definition Digital Television (SDTV) H.264/AVC encoded video sequences is presented. The algorithm introduced here makes use of the compression properties of the Context Adaptive Variable Length Coding (CAVLC) entropy encoder to achieve a low complexity and real-time inserting method. The chosen scheme hides the private message directly in the H.264/AVC bit stream by modifying the AC frequency quantized residual luminance coefficients of intrapredicted I-frames. In order to avoid error propagation in adjacent blocks, an interlaced embedding strategy is applied. Likewise, the steganography technique proposed allows self-detection of the hidden message at the target destination. The code source was implemented by mixing MATLAB 2010 b and Java development environments. Finally, experimental results have been assessed through objective and subjective quality measures and reveal that less visible artifacts are produced with the technique proposed by reaching PSNR values above 40.0 dB and an embedding bit rate average per secret communication channel of 425 bits/sec. This exemplifies that steganography is affordable in digital television.
  • Association between Perceived Risk and Training in the Construction Industry

    Universidad Peruana de Ciencias Aplicadas (UPC) (American Society of Civil Ingenieers, 2015-05)
  • The Implementation of ISO/IEC 29110 Software Engineering Standards and Guides in Very Small Entities

    Laporte, Claude Y.; O’Connor, Rory V.; García Paucar, Luis Hernán; (Springer International Publishing, 2016-03)
    This paper outlines the details of seven case studies involving the pilot usage of the new standard ISO/IEC 29110standard ‘Lifecycle Profiles for Very Small Entities’, which was specifically designed by Working Group 24 of ISO/IEC JTC1/SC7 to address the standardization needs of Very Small Entities (VSEs). The purpose of this paper is to add substantially to the body of knowledge and the literature on the rollout and implementation of this new and evolving standard and to act as guidance for other researchers in the design and implementation of ISO/IEC 29110 case studies. Furthermore it is hoped that that the lessons learnt from these case studies will help promote the adoption of this new standard in an industrial setting.
  • Hermite–Lagrangian finite element formulation to study functionally graded sandwich beams

    Universidad Peruana de Ciencias Aplicadas (UPC) (Elsevier B.V., 2016-04)
    This paper presents a static analysis of functionally graded single and sandwich beams by using an efficient 7DOFs quasi-3D hybrid type theory. The governing equations are derived by employing the principle of virtual works in a weak form and solved by means of the Finite Element Method (FEM). A C1 cubic Hermite interpolation is used for the vertical deflection variables while C0 linear interpolation is employed for the other kinematics variables. Convergence rates are studied in order to validate the finite element technique. Numerical results of the present formulation are compared with analytical and FEM solutions available in the literature.
  • El riesgo percibido y la gestión de la seguridad

    Universidad Peruana de Ciencias Aplicadas (UPC) (2015-08-18)
    Introducción: El personal de emergencia convive habitualmente con riesgos inherentes a su profesión. Objetivos: Profundizar acerca del concepto del riesgo percibido como herramienta para gestionar el riesgo ocupacional. Materiales y métodos: El modelo utilizado para la cuantificación del riesgo ha sido el paradigma psicométrico. De esta forma, se realizaron encuestas anónimas en las diferentes estaciones de bomberos. El cuestionario contenía preguntas sociodemográficas, nueve preguntas acerca de distintos atributos del riesgo y una pregunta acerca de la percepción del riesgo en general del sujeto. Resultados: El análisis estadístico muestra dos grupos claramente diferenciados en cuanto a su percepción del riesgo, siendo uno de ellos caracterizado por tener sus integrantes una alta percepción del riesgo y el otro por tener una baja percepción del riesgo. Por último, se muestra que solamente el nivel educacional era una variable significativa en la explicación del riesgo percibido. Conclusiones: Los resultados son discutidos en función de la literatura existente concluyendo que se debe formar a los trabajadores para elevar su percepción del riesgo.
  • The delay of consequences and perceived risk: an analysis from the workers' view point

    Universidad Peruana de Ciencias Aplicadas (UPC) (Universidad de Antioquia, 2015-06-03)
    This paper addresses the question of how construction workers perceive occupational risks. It is a question that has not been addressed in scientific research. Specifically, we answer the following research questions: what is the perception of risk of construction workers?; what aspects of risk significantly influence the formation of the overall perception of risk?; are there sociodemographic variables that help to understand the perception of risk of construction workers? and if this were the case, then what are these variables and how do they influence them?. Ultimately, it examines the profile of perceived risk, its relation to the delay of consequences and the influence of socio-demographic variables. Respondents filled out a questionnaire in the presence of the survey-taker. The questionnaire was based on the psychometric paradigm, and was comprised of: (a) nine questions, each exploring a perceived risk attribute or dimension rated on a Likert 7-point scale, (b) a question on global risk perception, and (c) categorical questions about socio-demographic issues. The survey was conducted in the city of Granada (Spain). A profile of the construction workers’ perceived risk was obtained. Answers to each attribute were above the neutral line (scores above four). The profile shows the risk dimension with the highest score was the delayed consequences of exposure to risk conditions, a dimension that can be related to ergonomics and occupational hygiene. This is a new outcome since traditionally this dimension was given a lower score in the worker’s perception. A simple linear regression showed global risk may be explained in terms of the delayed consequences dimension (R2=0.29). Finally, a variance analysis (ANOVA) and several t-tests explored the relationship between this dimension and the sample’s socio-demographic variables. To conclude, the delay of consequences is the risk dimension workers perceived as the most critical in their daily chores. In addition, this risk dimension is decisive in creating a high global risk perception. Parenthood, a higher worker category and training are the only socio-demographic variables having an impact on this dimension of perceived risk. Hence, there is a direct relationship between these two variables.
  • A biometric method based on the matching of dilated and skeletonized IR images of the veins map of the dorsum of the hand

    Universidad Peruana de Ciencias Aplicadas (UPC) (IEEE, 2015-06-02)
    This work proposes a biometric identification system that works together with a palm vein reader sensor and a hand-clenching support, designed to perform the capture the back of the hand. Several processing steps were performed: extraction of the region of interest, binarization, dilation, noise filtering, skeletonization, as well as extraction and verification of patterns based on the measurment of coincidence of vertical and horizontal displacements of skeletonized and dilated images. The proposed method achieved the following results: processing time post capture of 1.8 seconds, FRR of 0.47% and FAR of 0,00%, with a referential database of 50 people from a total of 1500 random captures.
  • Riesgo percibido en la construcción en España y Perú: un estudio exploratorio

    Universidad Peruana de Ciencias Aplicadas (UPC) (Universidad Industrial de Santander, 2015-05-07)
    Introducción: El sector de la construcción es uno de los más peligrosos. Se midió la percepción del riesgo que poseen los trabajadores de la construcción. La cultura puede afectar la percepción del riesgo. Objetivos: Dar a conocer el riesgo que perciben los trabajadores de la construcción en España y Perú, comparar y discutir las similitudes y diferencias entre países. Materiales y métodos: Estudio de carácter exploratorio transversal. Se utilizaron dos muestras de trabajadores: Españoles (N=204) y Peruanos (N=210) obtenidas en obras de edificación, obras civiles y centros de formación. El método de cuantificación es el paradigma psicométrico y su adaptación a la seguridad ocupacional de Portell & Solé en la NTP 578 del INSHT de España. Se utilizaron 9 atributos cualitativos del riesgo y un atributo cuantitativo global. Estos atributos se miden mediante escalas Likert de 1 a 7 puntos, mientras que el atributo cuantitativo global se mide mediante una escala de 1 a 100. Resultados: Los trabajadores de ambientes con riesgos potenciales o con maquinaria pesada tienen una percepción alta del riesgo. Los trabajadores de ambos países consideran que poseen suficiente conocimiento sobre la seguridad en el trabajo. Los trabajadores españoles consideran que sus responsables de seguridad y salud no poseen suficiente conocimiento, siendo mejor puntuados en Perú. La probabilidad de ocurrencia obtuvo baja puntuación. La medida cuantitativa global del riesgo no obtuvo diferencia estadísticamente significativa entre ambos países. Conclusiones: se debe estudiar el riesgo percibido en la construcción para mejorar las condiciones de salud de sus trabajadores.
  • SemIndex: Semantic-Aware Inverted Index

    Universidad Peruana de Ciencias Aplicadas (UPC) (Springer International Publishing, 2015-02-10)
    This paper focuses on the important problem of semanticaware search in textual (structured, semi-structured, NoSQL) databases. This problem has emerged as a required extension of the standard containment keyword based query to meet user needs in textual databases and IR applications. We provide here a new approach, called SemIndex, that extends the standard inverted index by constructing a tight coupling inverted index graph that combines two main resources: a general purpose semantic network, and a standard inverted index on a collection of textual data. We also provide an extended query model and related processing algorithms with the help of SemIndex. To investigate its effectiveness, we set up experiments to test the performance of SemIndex. Preliminary results have demonstrated the effectiveness, scalability and optimality of our approach.
  • El riesgo percibido por el trabajador de la construcción: ¿qué rol juega el oficio?

    Rodríguez Garzón, Ignacio; Martínez Fiestas, Myriam; López Alonso, Monica; (Escuela de Construcción Civil de la Pontificia Universidad Católica de Chile, 2014-07-18)
    This article presents a study of the perceived risk in the construction sector. The study was conducted from the analysis of questionnaires from several samples of construction workers from southern Spain. We report the perceived risk profile obtained from the psychometric paradigm through qualitative attributes and then we analyze the results. Stands out the attribute regarding how work affects our own long-term health. This represents something new with respect to previous studies. Also analyzed by analysis of variance (ANOVA) the effects of socio-demographic variable craft with respect to the different attributes of the perceived risk of the questionnaire. It presents the differences obtained between the group of masons and framers.