2,018 Hits in 1.9 sec

A Generalized Spectral Shaping Method for OFDM Signals [article]

Luis Díez, José A. Cortés, Francisco J. Cañete, Eduardo Martos, Salvador Iranzo
2018 arXiv   pre-print
This can be avoided by imposing a constraint on the absolute value of the real and imaginary parts of α α α k and ζ ζ ζ k , | {α k ( j)} |, | {α k ( j)} | ≤ CC for j = {1, . . . , |C|} , | {ζ k (r)} |,  ...  Similarly, since t k (n) = 0 for N GI + 1 ≤ n ≤ N + N GI , N GI +N n=N GI +1 t j (n)w −kn N = 0, ∀ j, k ∈ D as long as (4) holds.  ... 
arXiv:1807.09531v1 fatcat:oci4umgnwnawjbjmhhsp66qlqe

Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels

Luis M. Torres, Francisco J. Cañete, Luis Díez
2022 Sensors  
Therefore, we can write the relationship between the transmitted symbols s j [n] and the received signal in mode i, y i (t), as: y i (t) = ∑ n D ∑ j=1 s j [n]q ij (t − nT) + n i (t) (15) with n i (t) as  ...  Note that e 1 2 g (Kamp ) D (Kamp ) D −jωτ • diag e 1 2 g (Kamp ) 1 +jωτ 1 (Kamp ) , . . . , e 1 2 g (Kamp ) D (Kamp ) D +jωτ = diag e 1 2 g (Kamp ) 1 , . . . , e 1 2 g D (Kamp ) 2 Table 1 . 1 Simulation  ... 
doi:10.3390/s22030798 pmid:35161544 pmcid:PMC8839787 fatcat:h2imyehmsrburjgpnxaqk7td3u

Unveiling the Hyper-Rayleigh Regime of the Fluctuating Two-Ray Fading Model [article]

Celia Garcia-Corrales, Unai Fernandez-Plazaola, Francisco J. Cañete, José F. Paris, F. Javier Lopez-Martinez
2019 arXiv   pre-print
APPENDIX C PROOF OF LEMMA 4 Let us use (16) to express the received signal power as r = exp (jϕ 1 ) ζV 1 + ζV 2 exp (jα) + V d exp (−jϕ 1 ) , (41) where α = ϕ 2 − ϕ 1 .  ...  System Model for FTR fading The received signal in a wireless scenario can be expressed in the following general form [1] : r = N i=1 V i exp (jϕ i ) + M i=1 A i exp (jφ i ) , (14) where the V i and A  ... 
arXiv:1905.00065v1 fatcat:dfcige6t2vc6pbkwt3hop3sonu

Capacity ofκ-μShadowed Fading Channels

Celia García-Corrales, Francisco J. Cañete, José F. Paris
2014 International Journal of Antennas and Propagation  
The ergodic capacity of fading channels modeled with aκ-μshadowed distribution is investigated to derive closed-form expressions. Theκ-μshadowed distribution is of particular interest because it contains, as special cases, other classical ones like one-side Gaussian, Rayleigh, Rician, Nakagami-m,κ-μ, and Rician shadowed distributions. The paper discusses the physical meaning of the distribution parameter variations and also their impact on the channel capacity. These results can be used to
more » ... the behavior of different channels like the ones in underwater acoustic communications, land mobile satellite systems, body centric communications, and other wireless communication applications. The analytical closed-form expression results are validated with numerical simulations.
doi:10.1155/2014/975109 fatcat:47k7dgzs6vfbpfp2x5j3pmxrga

Towards a Theory on the Role of Ontologies in Software Engineering Problem Solving [chapter]

José M. Cañete, Francisco J. Galán
2005 Lecture Notes in Computer Science  
In a previous paper we investigated the uses of these languages in the context of several software development methodologies, finding that the most popular use is that of description (Cañete et al., [  ... 
doi:10.1007/978-3-540-31984-9_16 fatcat:si6wcyaq3nfyrd7r3ute2r5pea

Application of path duration study in multihop ad hoc networks

Alicia Triviño-Cabrera, Jorge García-de-la-Nava, Eduardo Casilari, Francisco J. González-Cañete
2008 Telecommunications Systems  
To compute the Link MRL, the i-th node utilizes the parameters μ i , σ i and the time when the link with the previous node j was established t ij .  ... 
doi:10.1007/s11235-008-9094-0 fatcat:lregucarn5h5hgcbbattwv2e4u

The intentional relationship of representation between the constructs of a language and reality

José M. Cañete-Valdeón, Francisco J. Galán, Miguel Toro
2009 Data & Knowledge Engineering  
Specifications of conceptualisations (ontologies) are often employed for representing reality, both in knowledge representation and software engineering. While languages offer sophisticated constructs and rigorous semantics for building conceptual entities, no attention is paid to the relationship between such entities and the world they intend to represent. This paper studies such a relationship and provides empirical evidences in favour of two main hypotheses: (1) conceptualisations are
more » ... icient to fully represent the specifics of reality; (2) languages (both representation and design-oriented) are general representations of (classes of) systems in the world, and they can be characterised as scientific theories. The first hypothesis establishes a problem for which we propose a solution based on the explicit elaboration of statements claiming the similarity (in some respects and to certain degrees of accuracy) between conceptual entities and real-world systems of interest. The second hypothesis constitutes a new perspective for understanding languages, whose advantages to representation and design are discussed in detail.
doi:10.1016/j.datak.2008.08.007 fatcat:csso6o6r4zd4dpdjpyjlzw3t24

A cross layer interception and redirection cooperative caching scheme for MANETs

Francisco J González-Cañete, Eduardo Casilari, Alicia Triviño-Cabrera
2012 EURASIP Journal on Wireless Communications and Networking  
Radio propagation model Two Ray Ground Coverage radio (m) 250 Ad hoc routing protocol AODV Mobility pattern TVCM RWP Speed (m/s) Constant: 1 Constant: 1-3-5 Pause time (s) 0 González-Cañete  ... 
doi:10.1186/1687-1499-2012-63 fatcat:yiu6nagogzcl5czqikski37xri

Thermorheological characteristics of chickpea flour slurry as affected by moisture content

M. Dolores Alvarez, Raúl Fuentes, M. Dolores Olivares, Francisco J. Cuesta, Wenceslao Canet
2014 Journal of Food Engineering  
Kaur and Singh (2005) reported higher enthalpies (3.5-4.9 J g -1 ) for CF slurries.  ...  Flour to water ratio T o (°C) T p (°C) T c (°C) ΔH gel (J g -1 ) PHI (J g −1 °C−1 ) I (°C) Highlights  Paste strength depended upon flour to water ratio and isothermal heating condition.  Decreasing  ... 
doi:10.1016/j.jfoodeng.2014.03.014 fatcat:dvpk3jpb25d6pfgsqnj6izsb2a

Rheometric non-isothermal gelatinization kinetics of high hydrostatic pressure treated chickpea flour slurry

M. Dolores Alvarez, Francisco J. Cuesta, Raúl Fuentes, Wenceslao Canet
2016 Journal of Food Engineering  
time t (s), k 0 the frequency factor (Pa s -1 ), n the order of the kinetic reaction, E a the activation energy (kJ mol -1 ), 223 T the absolute temperature (K), and R the universal gas constant (8.314 J  ... 
doi:10.1016/j.jfoodeng.2016.05.002 fatcat:vuu45fvhlvczpfsb374ai6nxku

PLC Networks with In-Band Full-Duplex Relays

Francisco J. Canete, Gautham Prasad, Lutz Lampe
2020 2020 IEEE International Symposium on Power Line Communications and its Applications (ISPLC)  
The value of SI rj (f ) varies according to the SI cancellation scheme used to implement IBFD for three considered options, hence j ∈ {1, 2, 3}.  ...  Hence, we obtain three different SINR γ r,FDj-DF (f ) for j ∈ {1, 2, 3}. Due to the signal regeneration in a DF scheme there is no noise amplification at the destination.  ... 
doi:10.1109/isplc48789.2020.9115410 dblp:conf/isplc/CanetePL20 fatcat:orbppgfwrzevlm2g4hslbp6clq

Lack of replication of interactions between polymorphisms in rheumatoid arthritis susceptibility: case–control study

Aida Ferreiro-Iglesias, Manuel Calaza, Eva Perez-Pampin, Francisco J Lopez Longo, Jose L Marenco, Francisco J Blanco, Javier Narvaez, Federico Navarro, Juan D Cañete, Arturo R de la Serna, Isidoro Gonzalez-Alvaro, Gabriel Herrero-Beaumont (+6 others)
2014 Arthritis Research & Therapy  
Approximately 100 loci have been definitively associated with rheumatoid arthritis (RA) susceptibility. However, they explain only a fraction of RA heritability. Interactions between polymorphisms could explain part of the remaining heritability. Multiple interactions have been reported, but only the shared epitope (SE) × protein tyrosine phosphatase nonreceptor type 22 (PTPN22) interaction has been replicated convincingly. Two recent studies deserve attention because of their quality,
more » ... their replication in a second sample collection. In one of them, researchers identified interactions between PTPN22 and seven single-nucleotide polymorphisms (SNPs). The other showed interactions between the SE and the null genotype of glutathione S-transferase Mu 1 (GSTM1) in the anti-cyclic citrullinated peptide-positive (anti-CCP + ) patients. In the present study, we aimed to replicate association with RA susceptibility of interactions described in these two high-quality studies. Methods: A total of 1,744 patients with RA and 1,650 healthy controls of Spanish ancestry were studied. Polymorphisms were genotyped by single-base extension. SE genotypes of 736 patients were available from previous studies. Interaction analysis was done using multiple methods, including those originally reported and the most powerful methods described. Results: Genotypes of one of the SNPs (rs4695888) failed quality control tests. The call rate for the other eight polymorphisms was 99.9%. The frequencies of the polymorphisms were similar in RA patients and controls, except for PTPN22 SNP. None of the interactions between PTPN22 SNPs and the six SNPs that met quality control tests was replicated as a significant interaction term-the originally reported finding-or with any of the other methods. Nor was the interaction between GSTM1 and the SE replicated as a departure from additivity in anti-CCP + patients or with any of the other methods. Conclusions: None of the interactions tested were replicated in spite of sufficient power and assessment with different assays. These negative results indicate that whether interactions are significant contributors to RA susceptibility remains unknown and that strict standards need to be applied to claim that an interaction exists.
doi:10.1186/s13075-014-0436-x pmid:25260880 pmcid:PMC4207328 fatcat:kvw4ybhwcfg67jbzzekxx5nl5y

A study on symbol timing recovery schemes for broadband in-home PLC

Javier Godoy, Francisco J. Canete, Jose A. Cortes, Luis Diez
2012 2012 IEEE International Symposium on Power Line Communications and Its Applications  
In this paper, algorithms for synchronization acquisition on multi-carrier transmission systems for broadband in-home power-line communications (PLC) are analyzed. Three symbol synchronization methods are studied and compared over realistic PLC channel models. These algorithms are evaluated as part of a PLC system that includes practical techniques for channel estimation, equalization and bit loading and whose parameters are set according to PLC standards.
doi:10.1109/isplc.2012.6201329 fatcat:wtvdyiwy4vep7ikm6lznsk6xhi

Ad hoc routing based on the stability of routes

Alicia Triviño-Cabrera, Irene Nieves-Pérez, Eduardo Casilari, Francisco J. González-Cañete
2006 Proceedings of the international workshop on Mobility management and wireless access - MobiWac '06  
Some reactive ad hoc protocols allow the discovery and/or storage of multiple paths to the same destination node. The selection of the path to utilize is commonly based on the criterion of the minimum number of hops. However, some other strategies could be appropriate to improve the network performance. In this paper, we intend to minimize the load in the network by choosing the most stable path, i.e. the path which is expected to have the longest lifetime. With this purpose, we estimate the
more » ... bility of the path by means of the received signal strength. The simulations show that important improvements associated to the network performance are achieved by the use of this cross-layer information.
doi:10.1145/1164783.1164801 dblp:conf/mobiwac/Trivino-CabreraNCG06 fatcat:uxkawggkmbdsjok7tfbk3hcg4y

Senescent synovial fibroblasts accumulate prematurely in rheumatoid arthritis tissues and display an enhanced inflammatory phenotype

Manuel J. Del Rey, Álvaro Valín, Alicia Usategui, Sandra Ergueta, Eduardo Martín, Cristina Municio, Juan D. Cañete, Francisco J. Blanco, Gabriel Criado, José L. Pablos
2019 Immunity & Ageing  
Accumulation of senescent cells has been associated with pro-inflammatory effects with deleterious consequences in different human diseases. The purpose of this study was to analyze cell senescence in human synovial tissues (ST), and its impact on the pro-inflammatory function of synovial fibroblasts (SF). The expression of the senescence marker p16INK4a (p16) was analyzed by immunohistochemistry in rheumatoid arthritis (RA), osteoarthritis (OA), and normal ST from variably aged donors. The
more » ... ortion of p16(+) senescent cells in normal ST from older donors was higher than from younger ones. Although older RA and OA ST showed proportions of senescent cells similar to older normal ST, senescence was increased in younger RA ST compared to age-matched normal ST. The percentage of senescent SA-β-gal(+) SF after 14 days in culture positively correlated with donor's age. Initial exposure to H2O2 or TNFα enhanced SF senescence and increased mRNA expression of IL6, CXCL8, CCL2 and MMP3 and proteins secretion. Senescent SF show a heightened IL6, CXCL8 and MMP3 mRNA and IL-6 and IL-8 protein expression response upon further challenge with TNFα. Treatment of senescent SF with the senolytic drug fenofibrate normalized IL6, CXCL8 and CCL2 mRNA expression. Accumulation of senescent cells in ST increases in normal aging and prematurely in RA patients. Senescence of cultured SF is accelerated upon exposure to TNFα or oxidative stress and may contribute to the pathogenesis of synovitis by increasing the production of pro-inflammatory mediators.
doi:10.1186/s12979-019-0169-4 pmid:31708994 pmcid:PMC6833299 fatcat:6nqloxduxvdb7j2kluqpuntrqq
« Previous Showing results 1 — 15 out of 2,018 results