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An important company located in an Industrial Park on the outskirts of Buenos Aires detected a sudden electrical failure in the plant, which used to affect the normal operation of a brand new wire stripping machine. Naturally, such a failure used to lead to significant losses on the production process. For this reason, the issue needed to be addressed in the short term.
Determining the critical parts of a system is key to effectively conduct preventive software maintenance. To accomplish this task, information from the system history (i.e., past versions) can be helpful for identifying those software elements that are more likely to receive modifications in the near future. However, interpreting the large amount of data usually present in the history can be difficult...
We present the computer implementation of different standards for the evaluation of human exposure to whole-body vibration. The resulting computer tool enables assessment and quantitative analysis of vibration records in accordance with current standards ISO 2631-1:1997, VDI 2057 Part 1 2002, and BS 6841:1987. The objective is to provide a user-friendly computer system, as a complement to a basic...
This paper proposes and tests a clustering technique of swarm robots into ζ clases. Based only on local information coming from neighboring robots and the distribution of virtual tokens in the system, the robots of the swarm can be grouped into different clases. The proposed technique acts in a distributed manner and without any global knowledge or movement of the robots. Depending on the amount and...
Determination of the vehicle orientation is fundamental for any autonomous tasks. Magnetometer readings may be inaccurate on indoor vehicles given metallic structures, electric and electronic devices. In this work a real time parallel algorith for yaw determination based on images processing instead of magnetometer readings is presented. The system is implemented in a ground station to aid a hovering...
The problem of biased affine estimation is discussed in the present paper. Affine estimation is a technique for improving parameter estimation through the inclusion of a-priori information in a non-bayesian setting. Here, a new optimality criterion for affine estimation is presented and developed. The closed form optimal transformation for this criterion is obtained through the use of the KKT conditions,...
In this article, it is described the experience in the development of mobile Augmented Reality (AR) applications written in JAVA with the open source framework Look!AR. This work is the result of an articulation between a research project on a mobile application testbed and a course of the School of Computing, National University of La Plata (UNLP) in which the students obtain new skills in the development...
Preliminary results from a project to build a maze-solver robot using artificial intelligence are presented, including construction details and the results achieved so far.
In previous work [1], a collision avoidance method for a multi-operator multi-robot teleoperation system, where each human operator drives a mobile robot with a high probability of collision, was proposed. In this work, the implementation of the teleoperation system using four real mobile robots and four master devices is carried out. Two kinds of tests are presented, for which experiments in order...
Different types of incomplete 2-port vector network analyzer (VNA) calibration methods are explained. All of them are particular cases of the 12-term error model and a comparison, including advantages and disadvantages, between them and a Full 2-Port method, such as TOSM, is made.
This article presents the preliminary results obtained from an earlier publication of a design study performed to integrate a cellular culture bioreactor along with an external magnetic stimulation system, which was aimed at creating ideal environmental conditions that allowed for cellular culture and cellular tissue growth to take place in three dimensions, under a sterile environment favorable for...
Integrated navigation systems are viewed in the context of state observability and reconstructibility. Practical empirical measures of observability and reconstructibility are proposed based on orthogonal subspace decomposition of the state space. For a given instrumental configuration a deterministic observability measure allows to qualify the persistence of excitation (POE) implicit in the vehicle's...
This article is aimed at presenting an architecture and methodology to be an alternative for formative assessment in conceptual design issues database, Entity-Relationship diagrams using a virtual environment. Between components are presented: Database Design and formative assessment in virtual environments as a key aspect of the research. Finally, it emphasizes the functionality of the methodology...
In this paper the design of an underwater acoustic link using the model for a short vertical channel is presented. From the specifications of the link, it is possible to determine the optimum operating frequency, modulation scheme and transmit power, information that will be useful to perform a selection of the appropriate acoustic transducer. For that purpose, a brief description of the channel model...
A new strategy for the detection and isolation of asymmetric demagnetization and mechanical imbalance problems in permanent magnet synchronous generators operating at steady-state is proposed in this paper. The strategy is based on measuring the voltage at the midpoint of the phase windings. Particularly, the presence of demagnetization faults is reflected in the midpoint voltage spectrum frequency...
Power converters are the subject of extensive research because of their ability to work under different operating conditions, providing bidirectional power flow, high dynamic range and fast response. These advantages allow them to be used as interface between the electric grid and many high power applications such as motors, energy storage, active filters and renewable energy sources. To be able to...
The inspection of documents written in natural language with computers has become feasible thanks to the advances in Natural Language Processing (NLP) techniques. However, certain applications require a deeper semantic analysis of the text to produce good results. In this article, we present an exploratory study of semantic-aware NLP techniques for discovering latent concerns in use case specifications...
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