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ABSTRACT: Aeronautical electronics and communication technologies have evolved from the analog domain to the digital domain, and nowadays, planes are complex structures serviced by many standalone systems that communicate through data buses. Many of these systems have found applicability in other sectors. This paper reviews the most recent technologies in modern aircraft and identifies their application in the automotive sector. It also identifies automotive electronics as applied in planes.
IEEE Transactions on Industrial Electronics 08/2011; · 5.16 Impact Factor
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ABSTRACT: The UrBan Interactions (UBI) research program, coordinated by the University of Oulu, has created a middleware layer on top of the panOULU wireless network and opened it up to ubiquitous-computing researchers, offering opportunities to enhance and facilitate communication between citizens and the government.
Computer 07/2011; · 1.47 Impact Factor
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Sensors & Transducers. 01/2010; 8:13.
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ABSTRACT: Packet switches with optical fabrics can potentially scale to higher capacities. It is also potentially possible to improve their reliability, and reduce both their footprint and power consumption. A well-known alternative for implementing hardwired switches is Arrayed Waveguide Grating (AWG). Ideally, AWG insertion losses do not depend on the number of input-output ports, meaning that scalability is theoretically infinite. However, accurate second-order assessment has demonstrated that in-band crosstalk exponentially increases the power penalty, limiting the realistic useful size of AWG commercial devices to about 10-15 ports (13-18 dB). On the other hand, the in-band crosstalk at AWG outputs depends on the connection pattern set by the scheduling algorithm and this port count limitation is calculated for worst-case scenarios. In this paper, we show that distributed schedulers with predetermined connection patterns can be used to avoid these harmful arrangements. We also show that the probability of worst-case patterns is very low, allowing us to set a more realistic port limit for general centralized schedulers and very small losses. With these results, we calculate more realistic port count limits for both scheduler types.
Communications, 2009. ICC '09. IEEE International Conference on; 07/2009
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ABSTRACT: The number of nomadic devices such as PDAs, MP3 players and especially cell phones has largely grown in the last years; Indeed, cell phones are becoming powerful, always-connected computers that store a lot of personal information (contacts, calendar, personal videos and pictures). The small size of their keyboards and screens is a major limitation of nomadic devices, hampering their utilization in vehicles. Handling them while driving may distract the user and increases the risk of accident, and it is illegal in some countries. According to the Web 2.0 vision, the Internet is a platform rather than a mere source of information. The interfaces of Ajax-based applications are user friendly, and they allow storing personal information and preferences. Google Maps is a good example of this philosophy. Nowadays, it is a familiar tool in desktop computers to locate destinations and to plan routes at home. In this paper we propose a new model of Web 2.0 information migration to nomadic devices that facilitates is access to cars.
IEEE Transactions on Consumer Electronics 03/2009; · 0.94 Impact Factor
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ABSTRACT: This paper focuses on automated content update for MHP applications. Some of the authors have been involved in the first MHP trials of TVG, the TV channel of Galicia, NW Spain (three million population). It has a 30% share at regional level, competing with national channels. However, the initial MHP trials have raised the problem of manual content update cost, since in many key applications, like news and weather forecasts, contents vary on a daily basis. We have reviewed the status of MHP deployment in similar TV channels, and we have determined that the problem is currently relevant. We describe our solutions for automated content update with minimal human intervention, and our practical experience with them.
Consumer Communications and Networking Conference, 2009. CCNC 2009. 6th IEEE; 02/2009
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ABSTRACT: Remote monitoring of physical effort has a great importance in the treatment of some cardiopathies. Nowadays, wearable motion-tracking devices represent an easy solution to acquire relevant data. We demonstrate a system based on a commercial sensor that sends real-time information to a hospital via a mobile gateway -the patient's cell phone- in the same Bluetooth WPAN.
Consumer Communications and Networking Conference, 2009. CCNC 2009. 6th IEEE; 02/2009
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ABSTRACT: In this paper, we propose and evaluate the possibility of extending vehicular controller-area network (CAN) fieldbuses with delay-tolerant networks (DTNs) based on the multihop car2car (C2C)-or vehicle2vehicle-paradigm. Previous research has focused on single-hop wireless communications, which are inadequate in many real-life scenarios [1]. We demonstrate that efficient network layers, such as DTNs, are necessary to overcome those limitations. As a proof of concept, we present a working prototype of a system that extends the standard diagnostics interface of a CAN bus.
IEEE Transactions on Industrial Electronics 10/2008; · 5.16 Impact Factor
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ABSTRACT: Human motion tracking and gait analysis is becoming a topic of great interest in everyday applications generating a large amount of research into systems that can provide this information in real time at a low cost and with the smallest intrusion level possible. In this line different approaches have been proposed following distinct philosophies usually related to the final application of the system. This paper is aimed on one hand at providing a review of non vision based current systems highlighting how distinct and oriented towards particular applications they are. On the other this paper deals with the problem of integrating such different elements into efficient environmental intelligence applications that can be used as a base for home rehabilitation or automatic elderly assistance. This is addressed by implementing a specific device access layer within a novel distributed agent based ambient intelligence architecture called HI<sup>3</sup>.
Virtual Environments, Human-Computer Interfaces and Measurement Systems, 2008. VECIMS 2008. IEEE Conference on; 08/2008
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ABSTRACT: The development of an opportunistic sensor network deployed on regular public transport vehicles with the aim of obtaining a flexible pollution monitoring system over large urban areas is presented. Georeferenced pollution data is acquired by a modular autonomous sensing system placed on vehicles which has been developed and is being currently tested. Short and long range communication systems are used to transmit data from the mobile sources to the central data processing and mapping unit. Within this unit an application to represent the geopositioned pollutant measurements has been implemented based on Google Earth. This provides the user with an interface allowing the study of the evolution of the gas concentrations along a given bus route as well as on the whole urban area.
Computational Intelligence for Measurement Systems and Applications, 2008. CIMSA 2008. 2008 IEEE International Conference on; 08/2008
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ABSTRACT: In [5] we proposed the load balanced WASPNET scheduler (LBWS), a novel scheduling approach for WASPNET optical packet switching (OPS) nodes. Unlike the original WASPNET description, LBWS is fully distributed and its computational cost is independent of switch size. Since it predicts packet delays at packet ingress based on a deterministic evolution of the switch configuration, it is not necessary to emulate RAM memories. However, LBWS does not maintain packet sequence. In this paper we present the LBWS algorithm with packet ordering (OLBWS), the first proposal to prevent mis-sequencing in a LBWS scheduler. We show that, despite the simplicity of the algorithm, a reasonable throughput can be achieved.
Optical Network Design and Modeling, 2008. ONDM 2008. International Conference on; 04/2008
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ABSTRACT: Previously the author's (Lopez-Bravo et al., 2007) proposed the Load Balanced WASPNET Scheduler (LBWS), a novel scheduling approach for WASPNET optical packet switching (OPS) nodes. Unlike the original WASPNET description, LBWS is fully distributed and its computational cost is independent from switch size. Since it predicts packet delays at packet ingress based on a deterministic evolution of the switch configuration, it is not necessary to emulate RAM memories. However, LBWS does not maintain the packet sequence. In this paper we present the LBWS algorithm with packet ordering (OLBWS), the first step to prevent mis-sequencing in a LBWS scheduler. We show that despite the algorithm simplicity a reasonable throughput can be achieved.
ICTON Mediterranean Winter Conference, 2007. ICTON-MW 2007; 01/2008
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ABSTRACT: In this paper, we review different architectures for near video-on-demand (NVoD) systems on satellite networks. In many scenarios, satellites are the only available option for content distribution. On the other hand, video-on-demand (VoD) has been a topic of intense research in the past. The main problem of VoD systems is that their bandwidth requirements do not scale well with user requests. For this reason, VoD is only feasible under some constraints. In general, NVoD systems are an approximation of VoD ones. In them, downloads do not necessarily start when the request arrives, but some time later. By doing so, it is possible to bound the total required bandwidth at the cost of introducing some delay in content download.
Satellite and Space Communications, 2007. IWSSC '07. International Workshop on; 10/2007
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ABSTRACT: In this paper we present a system that captures and processes streams from Access Grid virtual rooms (venues) and distributes them to web endpoints. Its distinctive advantage is the emulation of Access Grid features using standard web clients. The system includes a toolset to handle audio and video contents, demultiplex the different sources, transcode them to adequate formats and store the resulting multimedia streams in repositories in real-time. A specialized server delivers those streams to standard web browsers that synchronize them, emulating typical Access Grid features like multiple windows or dynamic video selection. Web browsers can compose multiple independent streams, providing the appearance of Access Grid presentations. This paper presents the design principles, the system architecture and our current implementation in detail.
Grid and Cooperative Computing, 2007. GCC 2007. Sixth International Conference on; 09/2007
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ABSTRACT: Large libraries are complex organizations. Radiofrequency identification (RFID) technologies allow the deployment of advanced services like re-shelving assistance. A number of commercial solutions for libraries have recently appeared, but so far there was a lack of objective assessments of the real benefits of RFID. In this paper we present the results of the validation that was funded by the EU in the framework of the LIBER-IMMS eTENproject. The validation was performed in libraries with different profiles, in three EU countries.
Automatic Identification Advanced Technologies, 2007 IEEE Workshop on; 07/2007
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ABSTRACT: Radio Frequency Identification (RFID) systems are one of the enabling technologies for the ubiquitous computing paradigm. At the moment, the EPCglobal organization leads the development of industry-driven standards for this field and has settled the EPC "Gen 2" as a reference standard. In this paper, we analyze the anti-collision procedure of EPC "Gen 2" to find the time needed to identify a population of tags, by means of the finite Markov-chain of the system. In addition, a UHF multi-reader prototype based on time division multiple access (TDMA) scheme is evaluated in this work. In this TDMA scheme, the reader time-slot duration is allocated according to the computations obtained from our analytical study. The main conclusions derived from this implementation are summarized in this work.
Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on; 07/2007
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ABSTRACT: In this paper, we review the state of the art of two key hardware technologies that support vehicular applications: on-board embedded systems and wireless sensor networks (WSN). We focus on pre-competitive or state-of-the-art hardware, and illustrate its use with two case studies: on-line navigation assistance and data collection in a mobile WSN. In the first case (based on a joint collaboration within project FUNCMOV PGIDIT05TIC00501CT, Xunta de Galicia, Spain), we describe our development experience with automotive embedded systems. In the second case, we analyze the feasibility of wake-up schema to gather data from highly dispersed sensor nodes. The goal of the paper is to offer a perspective on the current possibilities of these hardware systems.
Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on; 07/2007
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ABSTRACT: In this paper, we describe our experience in the development of a low-cost delay-tolerant network (DTN) node, based on a commercial wireless access point (AP). As far as we know, there are no previous related experiences. To achieve our goal, it was necessary to perform some changes in the original DTN stack implementation to support the AP hardware, and compile it with a Linux-based AP firmware. We explain all the steps we followed to install and test our modified firmware, and we comment our experience
Satellite and Space Communications, 2006 International Workshop on; 10/2006
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ABSTRACT: The parallel hierarchical matching (PHM) algorithm is a distributed maximal size matching scheduler for virtual output-queued switches. In a previous letter, we formulated an upper bound on the maximum number of iterations PHM requires to achieve a maximal size matching in any traffic scenario. In this letter, we follow an analytical approach to find the average number of iterations for PHM to achieve a maximal size matching under diverse traffic models. The estimated number of iterations is O(log<sub>2</sub>N), as in the case of iSLIP-like algorithms
IEEE Transactions on Communications 10/2006; · 1.68 Impact Factor
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ABSTRACT: In this paper, we apply support vector machines to identify peer-to-peer p2p traffic in high-performance routers. Commercial networks limit user access bandwidth, either physically or logically. However, in research networks there are no individual bandwidth restrictions, since this would interfere with research tasks. User behavior in research networks has changed radically with the advent of p2p multimedia file transfers: many users take advantage of the huge bandwidth, e.g. compared to domestic DSL access to exchange movies and the like. This behavior may have a deep impact on research network utilization. Consequently, in the framework of the MOLDEIP project, we have proposed to apply support vector machine detection to identify those activities in high-performance research network routers. The results in this paper suggest that support vector machine detection of p2p traffic in high-performance routers is highly successful and outperforms recent approaches like 1
Computational Intelligence for Measurement Systems and Applications, Proceedings of 2006 IEEE International Conference on; 08/2006
