Fading Evaluation in the 60GHz Band in Line-of-Sight Conditions

An exhaustive analysis of the small-scale fading amplitude in the 60GHz band is addressed for line-of-sight conditions (LOS). From a measurement campaign carried out in a laboratory, we have estimated the distribution of the small-scale fading amplitude over a bandwidth of 9GHz. From the measured data, we have estimated the parameters of the Rayleigh, Rice, Nakagami-m, Weibull, and \alpha-\mu distributions for the small-scale amplitudes. The test of Kolmogorov-Smirnov (K-S) for each frequency bin is used to evaluate the performance of such statistical distributions. Moreover, the distributions of the main estimated parameters for such distributions are calculated and approximated for lognormal statistics in some cases. The matching of the above distributions to the experimental distribution has also been analyzed for the lower tail of the cumulative distribution function (CDF).These parameters offer information about the narrowband channel behavior that is useful for a better knowledge of the propagation characteristics at 60GHz.This work was supported in part by the Spanish Ministerio de Ciencia e Innovacion TEC-2010-20841-C04-1 and by the Universitat Politecnica de Valencia, PAID 05-11 ref. 2702. The authors thank the anonymous reviewers for their valuable remarks and suggestions which have considerably enriched the final paper.Reig, J.; Martínez Inglés, M.; Rubio Arjona, L.; Rodrigo Peñarrocha, VM.; Molina-García-Pardo, J. (2014). Fading Evaluation in the 60GHz Band in Line-of-Sight Conditions. International Journal of Antennas and Propagation. 2014:1-12. https://doi.org/10.1155/2014/984102S1122014Smulders, P. (2002). Exploiting the 60 GHz band for local wireless multimedia access: prospects and future directions. IEEE Communications Magazine, 40(1), 140-147. doi:10.1109/35.978061Park, C., & Rappaport, T. (2007). Short-Range Wireless Communications for Next-Generation Networks: UWB, 60 GHz Millimeter-Wave WPAN, And ZigBee. IEEE Wireless Communications, 14(4), 70-78. doi:10.1109/mwc.2007.4300986Daniels, R. C., & Heath, R. W. (2007). 60 GHz wireless communications: Emerging requirements and design recommendations. IEEE Vehicular Technology Magazine, 2(3), 41-50. doi:10.1109/mvt.2008.915320Zwick, T., Beukema, T. J., & Haewoon Nam. (2005). Wideband channel sounder with measurements and model for the 60 GHz indoor radio channel. IEEE Transactions on Vehicular Technology, 54(4), 1266-1277. doi:10.1109/tvt.2005.851354Shoji, Y., Sawada, H., Chang-Soon Choi, & Ogawa, H. (2009). A Modified SV-Model Suitable for Line-of-Sight Desktop Usage of Millimeter-Wave WPAN Systems. IEEE Transactions on Antennas and Propagation, 57(10), 2940-2948. doi:10.1109/tap.2009.2029286Hao Xu, Kukshya, V., & Rappaport, T. S. (2002). Spatial and temporal characteristics of 60-GHz indoor channels. IEEE Journal on Selected Areas in Communications, 20(3), 620-630. doi:10.1109/49.995521Anderson, C. R., & Rappaport, T. S. (2004). In-Building Wideband Partition Loss Measurements at 2.5 and 60 GHz. IEEE Transactions on Wireless Communications, 3(3), 922-928. doi:10.1109/twc.2004.826328Smulders, P. (2009). Statistical Characterization of 60-GHz Indoor Radio Channels. IEEE Transactions on Antennas and Propagation, 57(10), 2820-2829. doi:10.1109/tap.2009.2030524Thomas, H. J., Cole, R. S., & Siqueira, G. L. (1994). An experimental study of the propagation of 55 GHz millimeter waves in an urban mobile radio environment. IEEE Transactions on Vehicular Technology, 43(1), 140-146. doi:10.1109/25.282274Kyro, M., Haneda, K., Simola, J., Takizawa, K., Hagiwara, H., & Vainikainen, P. (2012). Statistical Channel Models for 60 GHz Radio Propagation in Hospital Environments. IEEE Transactions on Antennas and Propagation, 60(3), 1569-1577. doi:10.1109/tap.2011.2180349Durgin, G. D., Rappaport, T. S., & de Wolf, D. A. (2002). New analytical models and probability density functions for fading in wireless communications. IEEE Transactions on Communications, 50(6), 1005-1015. doi:10.1109/tcomm.2002.1010620Yacoub, M. D. (2007). The κ-μ distribution and the η-μ distribution. IEEE Antennas and Propagation Magazine, 49(1), 68-81. doi:10.1109/map.2007.370983Martinez-Ingles, M.-T., Sanchis-Borras, C., Molina-Garcia-Pardo, J.-M., Rodriguez, J.-V., & Juan-Llacer, L. (2013). Experimental Evaluation of an Indoor MIMO-OFDM System at 60 GHz Based on the IEEE802.15.3c Standard. IEEE Antennas and Wireless Propagation Letters, 12, 1562-1565. doi:10.1109/lawp.2013.2293275Koay, C. G., & Basser, P. J. (2006). Analytically exact correction scheme for signal extraction from noisy magnitude MR signals. Journal of Magnetic Resonance, 179(2), 317-322. doi:10.1016/j.jmr.2006.01.016Charash, U. (1979). Reception Through Nakagami Fading Multipath Channels with Random Delays. IEEE Transactions on Communications, 27(4), 657-670. doi:10.1109/tcom.1979.1094444Hashemi, H. (1993). The indoor radio propagation channel. Proceedings of the IEEE, 81(7), 943-968. doi:10.1109/5.231342Yacoub, M. D. (2007). The $\alpha$-$\mu$ Distribution: A Physical Fading Model for the Stacy Distribution. IEEE Transactions on Vehicular Technology, 56(1), 27-34. doi:10.1109/tvt.2006.883753Coulson, A. J., Williamson, A. G., & Vaughan, R. G. (1998). Improved fading distribution for mobile radio. IEE Proceedings - Communications, 145(3), 197. doi:10.1049/ip-com:19981991Reig, J., & Rubio, L. (2011). On Simple Estimators of the α-μ Fading Distribution. IEEE Transactions on Communications, 59(12), 3254-3258. doi:10.1109/tcomm.2011.080111.09022

Time-of-flight and activation experiments on 147Pm and 171Tm for astrophysics

The neutron capture cross section of several key unstable isotopes acting as branching points in the s-process are crucial for stellar nucleosynthesis studies, but they are very challenging to measure due to the difficult production of sufficient sample material, the high activity of the resulting samples, and the actual (n,γ) measurement, for which high neutron fluxes and effective background rejection capabilities are required. As part of a new program to measure some of these important branching points, radioactive targets of 147Pm and 171Tm have been produced by irradiation of stable isotopes at the ILL high flux reactor. Neutron capture on 146Nd and 170Er at the reactor was followed by beta decay and the resulting matrix was purified via radiochemical separation at PSI. The radioactive targets have been used for time-of-flight measurements at the CERN n-TOF facility using the 19 and 185 m beam lines during 2014 and 2015. The capture cascades were detected using a set of four C6D6 scintillators, allowing to observe the associated neutron capture resonances. The results presented in this work are the first ever determination of the resonance capture cross section of 147Pm and 171Tm. Activation experiments on the same 147Pm and 171Tm targets with a high-intensity 30 keV quasi-Maxwellian flux of neutrons will be performed using the SARAF accelerator and the Liquid-Lithium Target (LiLiT) in order to extract the corresponding Maxwellian Average Cross Section (MACS). The status of these experiments and preliminary results will be presented and discussed as well

Consenso colombiano de atención, diagnóstico y manejo de la infección por SARS-COV-2/COVID-19 en establecimientos de atención de la salud Recomendaciones basadas en consenso de expertos e informadas en la evidencia

The “Asociación Colombiana de Infectología” (ACIN) and the “Instituto de Evaluación de Nuevas Tecnologías de la Salud” (IETS) created a task force to develop recommendations for Covid 19 health care diagnosis, management and treatment informed, and based, on evidence. Theses reccomendations are addressed to the health personnel on the Colombian context of health services. © 2020 Asociacion Colombiana de Infectologia. All rights reserved

Gaia Early Data Release 3: The celestial reference frame (Gaia-CRF3)

Context. Gaia-CRF3 is the celestial reference frame for positions and proper motions in the third release of data from the Gaia mission, Gaia DR3 (and for the early third release, Gaia EDR3, which contains identical astrometric results). The reference frame is defined by the positions and proper motions at epoch 2016.0 for a specific set of extragalactic sources in the (E)DR3 catalogue. Aims. We describe the construction of Gaia-CRF3 and its properties in terms of the distributions in magnitude, colour, and astrometric quality. Methods. Compact extragalactic sources in Gaia DR3 were identified by positional cross-matching with 17 external catalogues of quasi-stellar objects (QSO) and active galactic nuclei (AGN), followed by astrometric filtering designed to remove stellar contaminants. Selecting a clean sample was favoured over including a higher number of extragalactic sources. For the final sample, the random and systematic errors in the proper motions are analysed, as well as the radio-optical offsets in position for sources in the third realisation of the International Celestial Reference Frame (ICRF3). Results. Gaia-CRF3 comprises about 1.6 million QSO-like sources, of which 1.2 million have five-parameter astrometric solutions in Gaia DR3 and 0.4 million have six-parameter solutions. The sources span the magnitude range G = 13-21 with a peak density at 20.6 mag, at which the typical positional uncertainty is about 1 mas. The proper motions show systematic errors on the level of 12 μas yr-1 on angular scales greater than 15 deg. For the 3142 optical counterparts of ICRF3 sources in the S/X frequency bands, the median offset from the radio positions is about 0.5 mas, but it exceeds 4 mas in either coordinate for 127 sources. We outline the future of Gaia-CRF in the next Gaia data releases. Appendices give further details on the external catalogues used, how to extract information about the Gaia-CRF3 sources, potential (Galactic) confusion sources, and the estimation of the spin and orientation of an astrometric solution

Actas de las V Jornadas ScienCity 2022. Fomento de la Cultura Científica, Tecnológica y de Innovación en Ciudades Inteligentes

ScienCity es una actividad que viene siendo continuada desde 2018 con el objetivo de dar a conocer los conocimientos y tecnologías emergentes siendo investigados en las universidades, informar de experiencias, servicios e iniciativas puestas ya en marcha por instituciones y empresas, llegar hasta decisores políticos que podrían crear sinergias, incentivar la creación de ideas y posibilidades de desarrollo conjuntas, implicar y provocar la participación ciudadana, así como gestar una red internacional multidisciplinar de investigadores que garantice la continuación de futuras ediciones. En 2022 se recibieron un total de 48 trabajos repartidos en 25 ponencias y 24 pósteres pertenecientes a 98 autores de 14 instituciones distintas de España, Portugal, Polonia y Países Bajos.Fundación Española para la Ciencia y la Tecnología-Ministerio de Ciencia, Innovación y Universidades; Consejería de la Presidencia, Administración Pública e Interior de la Junta de Andalucía; Estrategia de Política de Investigación y Transferencia de la Universidad de Huelva; Cátedra de Innovación Social de Aguas de Huelva; Cátedra de la Provincia; Grupo de investigación TEP-192 de Control y Robótica; Centro de Investigación en Tecnología, Energía y Sostenibilidad (CITES

Effect of the Receiver Attachment Position on Ultra Wideband Off-Body Channels

An experimental characterization of the off-body propagation channel for the ultrawideband (UWB) band from 3.1 GHz to 8 GHz for body area networks (BAN) is presented in this letter. The channel is evaluated in terms of path loss (PL) and Root Mean Square (RMS) delay spread. Channel statistics from measurements carried out considering subjects of different gender in standing still position under line-of-sight (LOS) conditions are compared to the ones without the presence of the body to evaluate the variation on the statistics of the channel in presence of a human body. It is observed a high variation on the path loss and the RMS delay spread parameters for the same attachment position of the receiver antenna on the body of the subjects and a dependence of the statistics with the number of received multipath components (MPC) because of the shadowing effect of the body.This work was supported in part by MINECO, Spain (TEC2013-47360-C3-2-P), and in part by the European FEDER funds.García Serna, RG.; García Pardo, C.; Molina-García-Pardo, J. (2015). Effect of the Receiver Attachment Position on Ultra Wideband Off-Body Channels. IEEE Antennas and Wireless Propagation Letters. 14:1101-1104. https://doi.org/10.1109/LAWP.2015.2394737S110111041

A Predictive Model of Mortality in Patients With Bloodstream Infections due to Carbapenemase-Producing Enterobacteriaceae

Objective To develop a score to predict mortality in patients with bloodstream infections (BSIs) due to carbapenemase-producing Enterobacteriaceae (CPE). Patients and Methods A multinational retrospective cohort study (INCREMENT project) was performed from January 1, 2004, through December 31, 2013. Patients with clinically relevant monomicrobial BSIs due to CPE were included and randomly assigned to either a derivation cohort (DC) or a validation cohort (VC). The variables were assessed on the day the susceptibility results were available, and the predictive score was developed using hierarchical logistic regression. The main outcome variable was 14-day all-cause mortality. The predictive ability of the model and scores were measured by calculating the area under the receiver operating characteristic curve. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were calculated for different cutoffs of the score. Results The DC and VC included 314 and 154 patients, respectively. The final logistic regression model of the DC included the following variables: severe sepsis or shock at presentation (5 points); Pitt score of 6 or more (4 points); Charlson comorbidity index of 2 or more (3 points); source of BSI other than urinary or biliary tract (3 points); inappropriate empirical therapy and inappropriate early targeted therapy (2 points). The score exhibited an area under the receiver operating characteristic curve of 0.80 (95% CI, 0.74-0.85) in the DC and 0.80 (95% CI, 0.73-0.88) in the VC. The results for 30-day all-cause mortality were similar. Conclusion A validated score predictive of early mortality in patients with BSIs due to CPE was developed. Trial Registration clinicaltrials.gov Identifier: NCT01 764490. © 2016 Mayo Foundation for Medical Education and Researc

Consenso colombiano de atención, diagnóstico y manejo de la infección por SARS-COV-2/COVID-19 en establecimientos de atención de la salud Recomendaciones basadas en consenso de expertos e informadas en la evidencia

The “Asociación Colombiana de Infectología” (ACIN) and the “Instituto de Evaluación de Nuevas Tecnologías de la Salud” (IETS) created a task force to develop recommendations for Covid 19 health care diagnosis, management and treatment informed, and based, on evidence. Theses reccomendations are addressed to the health personnel on the Colombian context of health services. © 2020 Asociacion Colombiana de Infectologia. All rights reserved

A Predictive Model of Mortality in Patients With Bloodstream Infections due to Carbapenemase-Producing Enterobacteriaceae

Objective To develop a score to predict mortality in patients with bloodstream infections (BSIs) due to carbapenemase-producing Enterobacteriaceae (CPE). Patients and Methods A multinational retrospective cohort study (INCREMENT project) was performed from January 1, 2004, through December 31, 2013. Patients with clinically relevant monomicrobial BSIs due to CPE were included and randomly assigned to either a derivation cohort (DC) or a validation cohort (VC). The variables were assessed on the day the susceptibility results were available, and the predictive score was developed using hierarchical logistic regression. The main outcome variable was 14-day all-cause mortality. The predictive ability of the model and scores were measured by calculating the area under the receiver operating characteristic curve. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were calculated for different cutoffs of the score. Results The DC and VC included 314 and 154 patients, respectively. The final logistic regression model of the DC included the following variables: severe sepsis or shock at presentation (5 points); Pitt score of 6 or more (4 points); Charlson comorbidity index of 2 or more (3 points); source of BSI other than urinary or biliary tract (3 points); inappropriate empirical therapy and inappropriate early targeted therapy (2 points). The score exhibited an area under the receiver operating characteristic curve of 0.80 (95% CI, 0.74-0.85) in the DC and 0.80 (95% CI, 0.73-0.88) in the VC. The results for 30-day all-cause mortality were similar. Conclusion A validated score predictive of early mortality in patients with BSIs due to CPE was developed. Trial Registration clinicaltrials.gov Identifier: NCT01 764490. © 2016 Mayo Foundation for Medical Education and Researc