jesus garcia - Academia.edu (original) (raw)

Papers by jesus garcia

Proceedings of the ASME/IEEE Spring Joint Railroad Conference, 1992

In recent years new high speed railroad cars have been developed. In these systems, a considerabl... more In recent years new high speed railroad cars have been developed. In these systems, a considerable number of mechanical failures have been reported for different components of the braking system with a large percentage corresponding to the hake beams. In this paper, considerations and results regarding the ground vibration track induced contributions to the fatigue failure of brake beams are

20th European Microwave Conference, 1990, 1990

An abrupt change in microstrip linewidth, commonly called a microstrip impedance step, is a disco... more An abrupt change in microstrip linewidth, commonly called a microstrip impedance step, is a discontinuity that appears frequently in MMICs, such as, stepped impedance transformers and matching networks for example. Therefore, the accurate description of these step-discontinuties is important for the computer-aided design of conventional and monolithic MICs.

Lecture Notes in Computer Science, 2003

This work presents the application of neuro-fuzzy techniques to develop a rule-based fuzzy system... more This work presents the application of neuro-fuzzy techniques to develop a rule-based fuzzy system as an efficient and robust approach for object tracking based on sequences of video images. The fuzzy system is a new approach for data association problems in video image sequences, which uses JPDA formulation adapted to cope with video data peculiarities. The neurofuzzy learning algorithm uses examples extracted from a surveillance system of airport surface, including situations with very closely spaced objects (aircraft and surface vehicles moving on apron). The learned fuzzy system ponders update decisions both for the trajectories and shapes estimated for targets with the set of image regions (blobs) extracted from each frame. The inputs of the neuro-fuzzy system are several numeric heuristics, describing the quality of gated groups of blobs and predicted tracks, and outputs are confidence levels used in the update process. Rules are aimed to generate the most appropriate decisions under different conditions, emulating the reasoned decisions taken by an expert, and have been learned by the neuro-fuzzy system. The system performance with real image sequences of representative ground operations is shown at the end.

Lecture Notes in Computer Science, 2008

Inferring Trust in dynamic and subjective environments is a key interesting issue in the way to o... more Inferring Trust in dynamic and subjective environments is a key interesting issue in the way to obtain a complete delegation of human-like decisions in autonomous agents. With this final intention several trust models and strategies have been proposed by researchers, ...

Studies in Computational Intelligence, 2007

The Journal of neuroscience : the official journal of the Society for Neuroscience, Jan 28, 2015

The atrophy of skeletal muscles in patients with Krabbe disease is a major debilitating manifesta... more The atrophy of skeletal muscles in patients with Krabbe disease is a major debilitating manifestation that worsens their quality of life and limits the clinical efficacy of current therapies. The pathogenic mechanism triggering muscle wasting is unknown. This study examined structural, functional, and metabolic changes conducive to muscle degeneration in Krabbe disease using the murine (twitcher mouse) and canine [globoid cell leukodystrophy (GLD) dog] models. Muscle degeneration, denervation, neuromuscular [neuromuscular junction (NMJ)] abnormalities, and axonal death were investigated using the reporter transgenic twitcher-Thy1.1-yellow fluorescent protein mouse. We found that mutant muscles had significant numbers of smaller-sized muscle fibers, without signs of regeneration. Muscle growth was slow and weak in twitcher mice, with decreased maximum force. The NMJ had significant levels of activated caspase-3 but limited denervation. Mutant NMJ showed reduced surface areas and lowe...

Molecular phylogenetics and evolution, 2008

Identifying genetically and phenotypically distinct populations of threatened species is critical... more Identifying genetically and phenotypically distinct populations of threatened species is critical if we are to delineate appropriate plans for their conservation. We conducted an integrated analysis of population genetic structure, historical demographic events, current gene flow (all based on mtDNA sequences) and morphological variation of three geographically separated groups of populations of Dupont's lark Chersophilus duponti, located in the Iberian Peninsula (three populations), Morocco (two populations), and Tunisia (one population). Unusually, this lark species is the only one among the genus Chersophilus. Our results revealed the early historical divergence of an eastern Dupont's lark lineage (in Tunisia) and a western lineage (in Morocco and Spain), consistent with subspecies taxonomy and distribution. The western lineage subsequently split into two lineages, following the isolation of Iberian and African populations. Such pattern of historical differentiation cause...

ChemInform, 1998

ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The precise localization and role of InsP 3 R in cardiac muscle cells are largely unknown.

2008 Tyrrhenian International Workshop on Digital Communications - Enhanced Surveillance of Aircraft and Vehicles, 2008

Page 1. Abstract In this paper some key points of a new tool being currently developed by Euroco... more Page 1. Abstract In this paper some key points of a new tool being currently developed by Eurocontrol for Air Traffic Control multiradar-multisensor data processing systems performance assessment are described. It summarizes ...

Lecture Notes in Computer Science, 2010

ABSTRACT The design of complex fusion systems requires experimental analysis, following the class... more ABSTRACT The design of complex fusion systems requires experimental analysis, following the classical structure of experiment design, data acquisition, experiment execution and analysis of the obtained results. We present here a framework with simulation capabilities for sensor fusion in aerial vehicles. Thanks to its abstraction level it only requires a few high level properties for defining a whole experiment. Its modular design offers flexibility and makes easy to complete its functionality. Finally, it includes a set of tools for fast development and more accurate analysis of the experimental results.

International Journal of Microwave and Wireless Technologies, 2009

This paper describes some key points of a new tool being currently developed by Eurocontrol for t... more This paper describes some key points of a new tool being currently developed by Eurocontrol for the assessment of air traffic control (ATC) multisensor trackers performance. It summarizes the algorithmic foundations of the high-accuracy trajectory reconstruction process used to obtain reference trajectories from recorded measures. These trajectories will serve as a reference for the evaluation of the accuracy of ATC data processing centers. The performance of the system is illustrated with some reconstruction experiments on synthetic and real data.

Proceedings. The 21st Digital Avionics Systems Conference, 2002

... The codification only restricts rt and f, to valid values, r, in the range of possibleoperati... more ... The codification only restricts rt and f, to valid values, r, in the range of possibleoperations and U an integer between 0 and the maximum delay. Fitness Function The fitness value measures how a solution solves a problem. ...

2002 International Radar Conference (Radar 2002), 2002

This paper describes a novel methodology for the adaptive management of radar systems or radar ne... more This paper describes a novel methodology for the adaptive management of radar systems or radar networks used for air traffic control. It is based on linking radar tracking system overall resources consumption with air traffic control operational requirements. The method is exemplified with the design of a tracking function for a multifunction ESA radar. Some simulation results for this system

Stem Cell Reviews and Reports, 2014

Bone marrow-derived mesenchymal stem cells (MSC) can be differentiated into myocytes, as well as ... more Bone marrow-derived mesenchymal stem cells (MSC) can be differentiated into myocytes, as well as adipocytes, chondrocytes, and osteocytes in culture. Calcium channels mediate excitation-contraction coupling and are essential for the function of muscle. However, little is known about the expression of calcium channel subunits and calcium handling in stem cells. We examined whether the expression of calcium channel subunits in MSC is similar to that of skeletal muscle satellite cells and if their levels of expression are modified after treatment with bone morphogenetic protein-4 (BMP4). We found that during myogenic differentiation, MSC first express the α2δ1 subunit and the cardiac channel subunit Cav1.2. In contrast to the α2δ1 subunit levels, the Cav1.2 subunit decreases rapidly with time. The skeletal channel subunit Cav1.1 is detected at day 3 but its expression increases considerably, resembling more closely the expression of the subunits in satellite cells. Treatment of MSC with BMP4 caused a significant increase in expression of Cav1.2, a delay in expression of Cav1.1, and a reduction in the duration of calcium transients when extracellular calcium was removed. Calcium currents and transients followed a pattern related to the expression of the cardiac (Cav1.2) or skeletal (Cav1.1) α1subunits. These results indicate that differentiation of untreated MSC resembles differentiation of skeletal muscle and that BMP4 reduces skeletal muscle calcium channel expression and promotes the expression of cardiac calcium channels during myogenic differentiation.

VLSI Circuits and Systems III, 2007

Applications based on Fast Fourier Transform (FFT) such as signal and image processing require hi... more Applications based on Fast Fourier Transform (FFT) such as signal and image processing require high computational power, plus the ability to choose the algorithm and architecture to implement it. This paper explains the realization of a Split Radix FFT (SRFFT) processor based on a pipeline architecture reported before by the same authors. This architecture has as basic building blocks a

ESO ASTROPHYSICS SYMPOSIA, 2004

Astronomical archives have been built independently of each other showing a variety of access lev... more Astronomical archives have been built independently of each other showing a variety of access levels and policies. This has caused that their remote interoperability is neither easy nor efficient as demonstrated by the fact that the simultaneous query to multiple databases is presently done, most of the times, by hand.

ChemInform, 1999

An Efficient Synthesis of 5-Phosphorylated 1,3,2-Diazaphosphinines from β-Functionalized Enamines... more An Efficient Synthesis of 5-Phosphorylated 1,3,2-Diazaphosphinines from β-Functionalized Enamines Derived from Phosphine Oxides and Phosphonates.

Economics & Sociology, 2013

Revista Palmas, Jun 30, 2013