José-M. Pousada Carballo

University of Vigo | UVIGO · Department of Telematics Engineering

Future wireless communications are heading towards an all-Internet Protocol (all-IP) design, and will rely on the Session Initiation Protocol (SIP) to manage services, such as voice over IP (VoIP). The centralized architecture of traditional SIP has numerous disadvantages for mobile ad hoc services that may be possibly overcome by advanced peer-to-...

This article describes a simple model obtained from a commercial Stirling engine and used for heating a caravan. The Stirling engine has been tested in the lab under different electrical load conditions, and the operating points obtained are presented. As an application of the model, a series of transient simulations was performed using TRNSYS. Dur...

En el presente artículo se realiza una introducción a los servicios de grabación automatizada de clases en entornos universitarios. Servicios actualmente en fuerte crecimiento a nivel internacional y altamente valorados por los usuarios. Se hace un recorrido por diferentes iniciativas actualmente en curso en Universidades de EEUU y Europa así como...

In this paper we present our experience in the development of a web-based business intelligence tool according to the Associative Query Logic paradigm, which can represent large amounts of data in a way that allows extremely fast queries. It has been developed as an open-source, multi-platform software, relying on data compression techniques for th...

Providing a communication aid is a complex issue which requires a deep insight on the theoretical backgrounds, the technological basis and, specially, the problems faced in bringing together the expectations and needs of users, teachers, speech therapists, families... and the perspectives and knowledge of linguists, teachers, engineers and speech p...

Desde finales de los 90 diversas Universidades por todo el mundo han comenzado a ofrecer servicios de grabación y distribución de sus clases y conferencias vía Internet. Este servicio permite que los vídeos y/o audios de estas conferencias y clases, adecuadamente catalogados, puedan estar disponibles bajo demanda para sus alumnos o, en algunos caso...

For a long time, the design of relational databases has focused on the optimization of atomic transactions (insert, select, update or delete). Currently, relational databases store tactical information of data warehouses, mainly for select-like operations. However, the database paradigm has evolved, and nowadays on-line analytical processing (OLAP)...

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...

For a long time, the design of relational databases has focused on the optimization of atomic transactions (insert, select, update or delete). Currently, relational databases store tactical information of data warehouses, mainly for select-like operations. However, the database paradigm has evolved, and nowadays on-line analytical processing (OLAP)...

This communication describes an automatic inquiry forms 2. segmentation reader. This reader was developed in order to collect data from the inquiries that our school organizes. Inquiry 2.1 binarization forms ask some data about the study habits of our students. Before this system, data were collected manually. In the future, we want to generalize t...

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. I...

We present a low-cost design of a stabilized platform to position sensors in aerial vehicles. The stabilization system has been designed to provide enough precision for vehicles flying at an altitude of

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 fi...

In this paper, we propose an auxiliary location network, to support user-independent context-awareness in educational data networks; for example, to help visitors in a museum. We assume that, in such scenarios, there exist service servers that need to be aware of user location in real-time. Specifically, we propose the implementation of a Bluetooth...

Diverse social applications rely on remote location of personal devices: house arrest tracker systems, remote monitoring of alcoholic persons, child locator devices and remote protection of victims of domestic abuse are some examples. However, existing personal location devices either depend on a fixed station (a domestic gateway) -thus limiting us...

In this paper we propose the integration of high-precision indoor location networks - such as RADAR or Bluetooth Location Networks (BLNs) - into the UMTS architecture. Thus, in our approach, such networks become assistant location networks, to improve cell-ID location precision indoors. We demonstrate that assistant location networks are scalable a...

In this paper, we present a modular architecture for embed- ded sensorial-fusion systems. Each sensor is a task of a real-time operat- ing system, whose core is a Deadline Monotonic scheduler. The scheduler decides if the sensor set is admissible or not, according to user-specified deadlines. Additionally, it monitors sensor behavior to check if th...

iSLIP and parallel hierarchical matching (PHM) are distributed maximal size matching schedulers for input-buffered switches. Previous research has analyzed the hardware cost of those schedulers and their performance after a small number of iterations. In this paper, we formulate an upper bound for the number of iterations required by PHM to converg...

The authors present an experimental real-time GSM terminal detector, to be installed in a restricted area. The detector triggers terminal signaling, which can be captured.

A GSM protocol interceptor is a device located in a (possibly) closed area that listens to information exchanged between base stations (BSs) and mobile stations (MSs). This paper presents three new interception systems for security purposes. The first one (detector) forces all idle MSs nearby to generate activity, which can be used to activate an a...

Auctions are an ancient form of economic activity and, as such, have evolved with technology. However, some forms of traditional auction have survived unchanged, even in areas of great economic interest, until modern regulations imposed a change. We present the design of a specialized cellular network that has recently replaced traditional fish auc...

Input-buffered packet switches boosted with high-performance schedulers achieve near-100% throughput. Several authors have proposed the use of neural schedulers. These schedulers have a fast theoretical convergence, but the standard deviation of the number of iterations required can be arbitrarily large. In a previous paper, the authors proposed a...

The authors study the feasibility of a real-time 3G UMTS terminal detector to be located in a restricted area. All idle terminals entering the restricted area are forced to emit signaling information which can be captured. The authors analyze the detector protocol settings and response time. They also determine the conditions it would impose on UMT...

In this paper we show how a formal approach to design may speed up the development process for a new standard-based product: an interception device for GSM networks. We discuss the benefits, the limitations, and the lessons learnt using this approach, based on our own practical experience. A software package containing the results of this work and...

The authors propose a feasible real-time GSM terminal detector, to be located in a restricted area. All idle terminals entering it are forced to emit signaling information, which can be captured. As far as the authors know, market alternatives are nonexistent. A possible application is presented: a mobile terminal detector for airport access bridge...

This paper formulates an incomplete projection algorithm that is applied to the image recovery problem. The algorithm allows an easy implementation of dynamic load balancing for parallel architectures. Furthermore, the local computation-communication load ratio can be adjusted, since each processor performs a finite number of iterations of any proj...

Laboratory courses in Engineering and Computer Science are not always easy to implement using Internet-based distance education. Simulation has its limits, when compared to working with the real thing (like a computer board). The system we present in this paper provides remote access to real equipment used in a Computer Architecture laboratory. It...

We describe our experience using Formal Description Techniques (FDTs) to support the design of interception systems for GSM networks. Both the GSM protocol and the interceptor have been specified using LOTOS, an FDT standardized by the International Standardization Organization (ISO) to describe communication systems and protocols. This has permitt...

Virtual machines for remote execution are a useful tool for utilizing light user interfaces and intensive application cores in different physical machines connected through the Internet. In a virtual machine, application cores are distributed in a network. Specific locations, operating systems and hardware characteristics are hidden by virtual mach...

Input-buffered asynchronous transfer mode (ATM) packet switches are simpler than output-buffered switches. However, due to HOL blocking, their throughput is poor. Neural schedulers represent a promising solution for high throughput input-buffered switching, but their response time variance is too high for realistic hard real-time constraints. To ov...

This paper describes an educational methodology that we have implemented at the Universidad de Vigo which is based on a real competitive environment. It involves developing a communication subsystem, specified by a standard. Intercommunication between subsystems must take place successfully according to that standard. However, students are free to...

The authors analyse a neural scheduler with bounded response time and propose its use in real-time switches

A stochastic neural scheduler is presented which can be used to resolve conflicts in an input-buffered switch. It has smaller mean and variance of response time than neural schedulers recently proposed by Leung [1994, 1998]

A stochastic neural scheduler is presented which can he used to resolve conflicts in an input-buffered switch. It has smaller mean and variance of response lime than neural schedulers recently proposed by Leung.

The authors present a theoretical formulation and propose a system to disable mobile phones in designated areas. Field tests are described that support the viability of the system