Perfecto Mariño
University of Vigo
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Featured researches published by Perfecto Mariño.
IEEE Transactions on Industrial Electronics | 2009
Perfecto Mariño; Francisco Poza; Miguel Angel Domínguez; Santiago Otero
The electrical circuits and their electronic control units in city buses and coaches are essential for good performance. Drive, braking, suspension, door opening, security, and communication devices must be integrated in a reliable and real-time information system. The industrial communication networks or fieldbuses are a good solution to implement networked control systems for the onboard electronics in the public transport buses and coaches. Also, this trend of automotive electronics is being encouraged in the current European Union Framework Program (FP) (seventh FP), which is devoted to intelligent transportation systems, for facing the worlds new challenges in environmental care and efficient fuel consumption among others. The authors are working in the design of multiplexed solutions based on fieldbuses to integrate the body and chassis functions of city public transport buses. An example for the EURO5 model of the Scania manufacturer is reported in this paper.
International Journal of Satellite Communications and Networking | 2008
Fernando Perez Fontan; A. Mayo; D. Marote; Roberto Prieto-Cerdeira; Perfecto Mariño; F. Machado; N. Riera
The land mobile satellite (LMS) propagation channel is frequently described using statistical models. These models usually make different assumptions regarding the behavior of the direct signal, the diffuse multipath component and the shadowing effects. This paper analyzes the theoretical formulation and implementation of time-series synthesizers based on three typical statistical models: Loo, Corazza–Vatalaro and Suzuki, describing their similarities and differences. The discussion is not limited to the amplitude of the complex envelope but also to the phase variations and Doppler spectra. Finally, guidelines are also provided for comparing model parameters supplied by different authors. Copyright
IEEE Antennas and Wireless Propagation Letters | 2007
I. Sanchez-Lago; Fernando Perez Fontan; Perfecto Mariño; Uwe-Carsten Fiebig
This letter presents results on the suitability of the so-called synthetic storm technique (SST) for simulating signal attenuation time-series in a V-band satellite link. The focus is on both single rain events and the overall statistical behavior. Signal attenuation time-series can be used in computer simulations which shall help optimize fade mitigation techniques in wireless millimeter- wave communication systems where rain is the dominant source of signal attenuation. In this letter, the investigations reported are based on measured 40-GHz satellite beacon attenuation time-series.
international conference on information technology coding and computing | 2000
Perfecto Mariño; César A. Sigüenza; Juan B. Nogueira; Francisco Poza; Miguel Angel Domínguez
This is a work in progress paper where the authors are involved in a telco corporation reengineering project of a half terabyte data warehouse (DW). Firstly the DW context is introduced, focusing in three related and critical issues: the data source integration, component reuse and performance bottlenecks. Then we discuss the actual implicit architecture found in the runtime system, identifying the problems. Finally the proposed architecture is presented. It has two views: a static made with filters and pipes, and a dynamic based on an event driven scheduler, as opposed to a fixed time one. In the runtime scenario, the scheduler reads the pipe configurations from the metadata repository, and then executes on the fly the planned filters, transforming data into business information.
IEEE Transactions on Instrumentation and Measurement | 2010
Perfecto Mariño; Fernando Perez Fontan; Miguel Angel Domínguez; Santiago Otero
Biological research in agriculture requires a wide range of electronic sensors to fulfill different goals, such as climate monitoring, soil and fruit assessment, control of insects and diseases, chemical pollutants, identification and control of weeds, crop tracking, and so on. This research must be supported by consistent biological models able to simulate diverse environmental conditions to advice on the needed human actions before risky biological damage could become irreversible. In this paper, an experimental agrometeorological sensor-based wireless distributed network is described. Its purpose is to provide real measurements to validate the different biological models used for viticulture applications.
international conference on industrial informatics | 2006
Perfecto Mariño; Fernando Perez Fontan; Fernando Machado; Santiago Otero
The performance of millimetre wavelength wireless access network technologies are significantly impaired by rain effects. To evaluate the rain effects over a communication system, it is essential to know the temporal and spatial evolution of rainfall rate. For this reason it is necessary to develop an experimental network that provides sufficient data to study and establish means to prevent and compensate for the detrimental effects of rain. In this paper, an experimental rain gauge network is presented. This network comprises weather stations capable of measuring rainfall rate, temperature and humidity. The paper describes first the experimental network for automatic data acquisition as a system based in a distributed process. The design of the experimental network is explained in detail and finally the interest for millimetre wavelength applications is pointed out.
asia pacific software engineering conference | 1999
Perfecto Mariño; César A. Sigüenza; Juan B. Nogueira; Francisco Poza; Miguel Angel Domínguez
This is a work in progress paper where authors are involved in a Telco corporation reengineering project of a half terabyte data warehouse (DW). Firstly the DW context is introduced. Then we discuss the actual implicit architecture found in the runtime system, identifying the problems. Finally the proposed architecture is presented. It has two views: a static, made with filters and pipes, and a dynamic based on an event driven scheduler, as opposed to a fixed time one. In the runtime scenario, the scheduler reads the pipe configurations from the metadata repository, and then executes on the fly the planed filters, transforming data into business information.
IEEE Transactions on Industrial Electronics | 2010
Perfecto Mariño; Francisco Poza; Santiago Otero; Miguel Angel Domínguez
The objective of this paper is the development of a software architecture to ease access and management of data for applications with variable and configurable data sources. The purpose of this architecture is to build a configurable and flexible system where acquisition tasks are decoupled from data-access tasks. To accomplish this, the authors have implemented what they have called virtual acquisition cards , which provide a reconfigurable and dynamic view during runtime of the data required by the user applications. These data can be used by different kind of applications from diverse knowledge areas (meteorological, industrial, medical, and so on) for the analysis of behavioral models or condition monitoring. This paper introduces the architecture of the system proposed with its involved parts. Then, it details the most important parts of the system and how they work. Next, several real working applications, using the proposed architecture, are shown. A discussion about other existing commercial systems is made, and finally, future works and conclusions are presented.
International Journal of Satellite Communications and Networking | 2005
Fernando Pérez-Fontán; S. Martínez; B. Sanmartín; Cristina Enjamio; Perfecto Mariño; Fernando Machado
In this paper, a technique to derive the transition probabilities for a Markov chain model for the land mobile satellite (LMS) channel in built-up areas is presented. This technique contributes to improving empirically derived parameters in that it can account for elevation and street orientation effects as well as building density. Physical-statistical or ‘virtual city’ techniques are used to relate observed edification statistics to signal attenuation statistics. This methodology can also be applied to generating correlated time-series for simultaneous links to a constellation of satellites from the same mobile terminal. The proposed approach also allows the generation of enhanced time-series which take into account diffuse multipath and diffraction effects. Copyright
Computer Networks | 2004
Perfecto Mariño; Miguel Angel Domínguez; Francisco Poza; Fernando Vázquez
The aim of this paper is to expose the utility of formal description techniques (FDTs) applied to the design of industrial communication protocols (fieldbuses). For this purpose the authors explain their experience in the formal specification of the data link layer of the WorldFIP French standard. Nowadays there is in the market a great number of protocols in the framework of industrial communications. They are devised for specific applications and distributed control processes. Every manufacturer has tied its customers to its own proprietary fieldbuses, which has led this technology to a great lack of standardization. Thus, the interconnection of equipment from different manufacturers has become very problematic. In this paper an introduction to fieldbuses is given, with an explanation of their main features, standardization attempts and applications. WorldFIP is a fieldbus network protocol designed to provide links between sensors/actuators and process units (PLCs, controllers, etc.) in automation systems. This protocol has been proposed by French manufacturers and has become a standard. This paper analyses the data link layer of WorldFIP, specifying it with the formal language LOTOS. This is a formal description technique (FDT) standardized by ISO (International Organization, for Standardization) for designing services and protocols used in the communication of open systems (OSI: Open systems Interconnection). Also, the methodology followed for validating the formal description is explained. Finally an executable that constitutes a simulation system for WorldFIP networks is implemented following this specification.