Daniel Morales Pérez - Academia.edu (original) (raw)

Papers by Daniel Morales Pérez

2018 37th International Conference of the Chilean Computer Science Society (SCCC), 2018

Computer science tecniques, methodologies, and approaches, are directly applied to improve other ... more Computer science tecniques, methodologies, and approaches, are directly applied to improve other enginnering disciplines. Construction is no exception, where software and data analysis are used to improve the processes of control and monitoring of construction projects. Most of the analysis are based on a key-value perspective analysis of the data. However, an emerging Process Mining discipline has proven to be able to capture a different process perspective. This interdisciplinary work is a step on this direction, proposing the Constraint Bag Process Model (CBPM), a novel use of Process Mining for answering process-oriented questions on construction projects.

Campus, 2019

Implementación de Lora y Lorawan como escenario futuro de la industrias 4.0 en el sector agroindu... more Implementación de Lora y Lorawan como escenario futuro de la industrias 4.0 en el sector agroindustrial peruano rEsumEn El panorama actual del sector agroindustrial exige la inclusión de nuevas tecnologías que contribuyan a solucionar los constantes problemas a los que se enfrenta. Internet of Things se presenta como una alternativa para mitigarlos; sin embargo, las implementaciones de esta tecnología se realizan con el uso de redes de datos tradicionales como Wifi o redes celulares, las cuales representan un alto costo y consumo de energía. En esta investigación se realizó un análisis de la arquitectura y funcionamiento de la tecnología LoRa y el protocolo LoRaWAN, además de plantearse una serie de recomendaciones de cómo implementarla conjuntamente con otras tecnologías emergentes como es el BlockChain, todo esto, aplicado a la agroindustria peruana.

Research in Computing Science, 2016

This article presents the development of a computer system that through a Web application allows ... more This article presents the development of a computer system that through a Web application allows to manage information generated in a laboratory of signal acquisition and processing, where research studies were carried out monitoring electrical measurements. The on line management of the information allows users to share and access from different places. One of the most critical points in the management of this information is that the experimental protocols must be stored in a single way, thus a relational data base was proposed. On the other hand, the generation of different questionnaires associated to a protocol implies that database structure should consider different form and sizes so the use of a NoSQL database is proposed thus ensuring the system to upgrade and be adaptable to several kind of studies.

Computers in Industry, 2018

Rolling of flat steel products is an industrial process in the field of metalworking where two or... more Rolling of flat steel products is an industrial process in the field of metalworking where two or more pairs of rolls reduce the thickness of a steel strip to produce a uniform thickness material. Despite it has been studied for many years, there are still unpredictable problems that can affect the final quality of the product. One of them is the so-called chatter, that is a powerful self-excited vibration that appears suddenly and limits the productivity of the process. In this paper, a visual analytics approach is considered for exploratory analysis in order to discover and understand the factors and conditions under which chatter appears. An interactive web-based interface is presented here which allows the user to explore a map of dynamical conditions and visualize relevant details of each chatter onset. A validation case is performed using real data where normal/fault conditions have been identified automatically. By means of interactive exploration, the tool allows to refine an automatic chatter detection method. Moreover, it is shown to reveal correlations between variables, providing in some expected cases databased confirmation, but also revealing less obvious relationships. Finally, it provides context, allowing to carry out comparative analysis, both qualitative and quantitative, for different subsets of coils (e.g. different years) as well as for different working conditions.

Multimodal Technologies and Interaction, 2017

There has been extensive research on dimensionality reduction techniques. While these make it pos... more There has been extensive research on dimensionality reduction techniques. While these make it possible to present visually the high-dimensional data in 2D or 3D, it remains a challenge for users to make sense of such projected data. Recently, interactive techniques, such as Feature Transformation, have been introduced to address this. This paper describes a user study that was designed to understand how the feature transformation techniques affect user's understanding of multi-dimensional data visualisation. It was compared with the traditional dimension reduction techniques, both unsupervised (PCA) and supervised (MCML). Thirty-one participants were recruited to detect visual clusters and outliers using visualisations produced by these techniques. Six different datasets with a range of dimensionality and data size were used in the experiment. Five of these are benchmark datasets, which makes it possible to compare with other studies using the same datasets. Both task accuracy and completion time were recorded for comparison. The results show that there is a strong case for the feature transformation technique. Participants performed best with the visualisations produced with high-level feature transformation, in terms of both accuracy and completion time. The improvements over other techniques are substantial, particularly in the case of the accuracy of the clustering task. However, visualising data with very high dimensionality (i.e., greater than 100 dimensions) remains a challenge.

Ingenieria Hidraulica Y Ambiental, Apr 1, 2014

Se presenta una herramienta para resolver modelos de programación lineal entera, lo que significa... more Se presenta una herramienta para resolver modelos de programación lineal entera, lo que significa encontrar el valor óptimo de la función objetivo para variables de decisión enteras. Es una función llamada nbintprog (non binary integer programming) creada por los autores en el asistente matemático MATLAB (MatrixLaboratory) y para comodidad del usuario presenta una forma similar a las funciones de optimización propias de MATLAB. La existencia de situaciones donde sólo tiene sentido que las variables de decisión, por su naturaleza, sean números enteros y los inconvenientes que presenta la herramienta que propone MATLAB para su solución constituyen los motivos del trabajo. Nbintprog tiene como base matemática una técnica de ramificación y acotación (branch and bound) que junto a estrategias de programación utilizadas presenta características favorables para la solución de dichos modelos.

Neurocomputing, 2015

Full bibliographic details must be given when referring to, or quoting from full items including ... more Full bibliographic details must be given when referring to, or quoting from full items including the author's name, the title of the work, publication details where relevant (place, publisher, date), pagination, and for theses or dissertations the awarding institution, the degree type awarded, and the date of the award.

In this paper is presented the current status of the activities carried out in Cuba in order to e... more In this paper is presented the current status of the activities carried out in Cuba in order to ensure the on-line transfer of knowledge through Internet from the research nuclear reactor RA-6 (called host reactor) located at the Atomic Center of Bariloche, Argentina, to the Higher Institute of Technology and Applied Sciences (called invited institution). These activities are part of the Internet Laboratory Reactor project, which it is framed in an agreement with the International Atomic Energy Agency. In the project, also participate other invited institutions of Colombia and Ecuador. The host reactor will facilitate online access to the data and video signals of experiments during transmission sessions to the invited institutions. The access to these data and video signals in the invited institutions will be done using a web and video conferencing platform. The development of this project will enable the access to new knowledge to improve the process of training professionals, rai...

Los sistemas hidraulicos navales son redes de tuberias que intervienen en la mayoria de las funci... more Los sistemas hidraulicos navales son redes de tuberias que intervienen en la mayoria de las funciones de una embarcacion. Este trabajo desarrolla el diseno de un sistema de achique y contraincendios de un buque, para lo cual se emplea el software EPANET, con el objetivo de demostrar la factibilidad del diseno de sistemas hidraulicos navales basado en la simulacion computacional. Se concluye que la simulacion integrada al diseno de estas redes, permite configurar los sistemas de manera que las variables de flujo se encuentren dentro de los rangos recomendables y reglamentarios; posibilita la recreacion de diferentes escenarios del sistema, asi como el analisis de variantes y el diseno gradual; evita la seleccion de componentes sobredimensionados o erroneos, lo que viabiliza la optimizacion de pesos y costos de los sistemas. Palabras clave: EPANET, simulacion de sistemas navales, sistemas contraincendios en buques, sistemas de achique, sistemas de tuberias en buques.

Journal of Marine Science and Application, 2020

This paper aims to evaluate the feasibility of pressure-dependent models in the design of ship pi... more This paper aims to evaluate the feasibility of pressure-dependent models in the design of ship piping systems. For this purpose, a complex ship piping system is designed to operate in firefighting and bilge services through jet pumps. The system is solved as pressure-dependent model by the piping system analysis software EPANET and by a mathematical approach involving a piping network model. This results in a functional system that guarantees the recommendable ranges of hydraulic state variables (flow and pressure) and compliance with the rules of ship classification societies. Through this research, the suitability and viability of pressure-dependent models in the simulation of a ship piping system are proven.

Tecnología y Ciencias del Agua, 2017

The major cost component in the water production of groundwater supply system (once the wells are... more The major cost component in the water production of groundwater supply system (once the wells are built) is pumping water from wells. In this contribution a new module in MADA (groundwater management model) based on the inclusion of a simulationoptimization model to minimize the operating cost in the aquifers exploitation is proposed. The proposal uses a two-dimensional simulation model of groundwater flow (AQÜIMPE) based on the finite element method. The response matrix approach is used to link AQÜIMPE with a quadratic programming problem, which is solved using the function quadprog of the mathematical assistant MATLAB. The model is applied in the administration of the exploitation in the Cuenca Sur aquifer, an exploitation policy is obtained that allows to save around a 15% of pumping costs relative to the cost of the actual operation in the year 2007. In addition, the obtained exploitation pattern satisfies a set of constraints of water demand, aquifer levels and installed capacity in each operating well.

En este artículo se realiza un análisis comparativo entre algunos de los resultados que ofrecen d... more En este artículo se realiza un análisis comparativo entre algunos de los resultados que ofrecen dos sistemas de modelación de aguas subterráneas: MODFLOW y AQÜIMPE. Con vista a que los modeladores puedan utilizar en un caso de estudio las herramientas y capacidades de simulación de ambos modelos, se presentan varias estrategias de modelación que contribuyen a la similitud de los resultados de ambos sistemas, constituyendo uno de los resultados más notables del trabajo. Para el análisis comparativo se realiza la modelación matemática de un caso de estudio didáctico mediante ambos sistemas y posteriormente se modela el acuífero de Cuentas Claras (provincia Granma, Cuba) con el objetivo de analizar el comportamiento de ambos modelos ante un caso real en donde existen varias zonas de propiedades y de infiltración. This article makes a comparative analysis between the results offered by two groundwater modeling softwares, such as MODFLOW and AQÜIMPE. To facilitate modelers the use in a c...