Local Positioning Services on IEEE 802.11 Networks

This paper deals with localization services in IEEE 802.11 networks, for indoor environment. The proposed solution processes the Time Of Arrival of location packets sent by a Mobile Terminal, that makes access in a IEEE 802.11 network. A set of Location Supporting Nodes and a Location Support Server composes an indoor location services architecture. A fully compatible IEEE 802.11 Localization Services protocol supporting data exchange related to both TOA measurement and processing is reported. Simulation results show the method efficiency in both IEEE 802.11 PCF and DCF modes. Assessment of the maximum number of users for which location services can be provided is also reported. Since high localization accuracy requires large bandwidth, a broadband antenna for LSN and LSS was designed. The related results are reported in the second part of the paper. The antenna works at 5.0 GHz (centre frequency) in broadband mode and is matched on the wireless operating frequencies with a percentage more than 8% (1:1.5 VSWR)

An Intelligent Transportation System Application for Smartphones Based on Vehicle Position Advertising and Route Sharing in Vehicular Ad-Hoc Networks

[EN] Alerting drivers about incoming emergency vehicles and their routes can greatly improve their travel times in congested cities, while reducing the risk of accidents due to distractions. This paper contributes to this goal by proposing Messiah, an Android application capable of informing regular vehicles about incoming emergency vehicles like ambulances, police cars and fire brigades. This is made possible by creating a network of vehicles capable of directly communicating between them. The user can, therefore, take driving decisions in a timely manner by considering incoming alerts. Using the support of our GRCBox hardware, the application can rely on vehicular ad-hoc network communications in the 5 GHz band, being V2V (vehicle-to-vehicle) communication provided through a combination of Android-based smartphone and our GRCBox device. The application was tested in three different scenarios with different levels of obstruction, showing that it is capable of providing alerts up to 300 meters, and notifying vehicles within less than one secondThis work was partially supported by the "Ministerio de Economia y Competividad, Programa Estatal de Investigacion, Desarollo e Innovacion Orientada a los Retos de la Sociedad, Proyectos I+D+I 2014", Spain, under Grant Nos. TEC2014-52690-R and BES-2015-075988.Hadiwardoyo, SA.; Patra, S.; Tavares De Araujo Cesariny Calafate, CM.; Cano, J.; Manzoni, P. (2018). An Intelligent Transportation System Application for Smartphones Based on Vehicle Position Advertising and Route Sharing in Vehicular Ad-Hoc Networks. Journal of Computer Science and Technology. 33(2):249-262. https://doi.org/10.1007/s11390-018-1817-4S249262332Papadimitratos P, De La Fortelle A, Evenssen K, Brignolo R, Cosenza S. Vehicular communication systems: Enabling technologies, applications, and future outlook on intelligent transportation. IEEE Communications Magazine, 2009, 47(11): 84-95.Gerla M, Kleinrock L. Vehicular networks and the future of the mobile Internet. Computer Networks, 2011, 55(2): 457-469.Vegni A M, Loscrí V. A survey on vehicular social networks. IEEE Communications Surveys & Tutorials, 2015, 17(4): 2397-2419.Eze E C, Zhang S J, Liu E J. Vehicular ad hoc networks (VANETs): Current state, challenges, potentials and way forward. In Proc. the 20th Int. Conf. Automation and Computing, September 2014, pp.176-181.Qi L. Research on intelligent transportation system technologies and applications. In Proc. Workshop on Power Electronics and Intelligent Transportation System, August 2008, pp.529-531.Gozalvez J. First Google’s Android phone launched [Mobile Radio]. IEEE Vehicular Technology Magazine, 2008, 3(4): 3-69.Haklay M,Weber P. OpenStreetMap: User-generated street maps. IEEE Pervasive Computing, 2008, 7(4): 12-18.Hadiwardoyo S A, Patra S, Calafate C T, Cano J C, Manzoni P. An Android ITS driving safety application based on vehicle-to-vehicle (V2V) communications. In Proc. the 26th Int. Conf. Computer Communication and Networks, July 31-August 3, 2017.Eriksson J, Balakrishnan H, Madden S. Cabernet: Vehicular content delivery using WiFi. In Proc. the 14th ACM Int. Conf. Mobile Computing and Networking, September 2008, pp.199-210.Gerla M, Weng J T, Giordano E, Pau G. Vehicular testbeds-validating models and protocols before large scale deployment. In Proc. Int. Conf. Computing Networking and Communications, January 30-February 2, 2012, pp.665-669.Wahlström J, Skog I, Händel P. Smartphone-based vehicle telematics: A ten-year anniversary. IEEE Trans. Intelligent Transportation Systems, 2017, 18(10): 2802-2825.Whipple J, Arensman W, Boler M S. A public safety application of GPS-enabled smartphones and the Android operating system. In Proc. IEEE Int. Conf. Systems Man and Cybernetics, October 2009, pp.2059-2061.Meseguer J E, Calafate C T, Cano J C, Manzoni P. DrivingStyles: A smartphone application to assess driver behavior. In Proc. IEEE Symp. Computers and Communications, July 2013, pp.000535-000540.You C W, Lane N D, Chen F L, Wang R, Chen Z Y, Bao T J, Montes-De-Oca M, Cheng Y T, Lin M, Torresani L, Campbell A T. CarSafe app: Alerting drowsy and distracted drivers using dual cameras on smartphones. In Proc. the 11th Annual Int. Conf. Mobile Systems Applications and Services, June 2013, pp.461-462.Patra S, Arnanz J H, Calafate C T, Cano J C, Manzoni P. EYES: A novel overtaking assistance system for vehicular networks. In Proc. the 14th Int. Conf. Ad-Hoc Networks and Wireless, June 2015, pp.375-389.Togneri M C, Deriaz M. On-board navigation system for smartphones. In Proc. Int. Conf. Indoor Positioning and Indoor Navigation, October 2013.Dancu A, Franjcic Z, Fjeld M. Smart flashlight: Map navigation using a bike-mounted projector. In Proc. the SIGCHI Conf. Human Factors in Computing Systems, April 2014, pp.3627-3630.Yamabe T, Ikegami S, Ishizaki A, Kitagami S, Kiyohara R. Car navigation user interface based on a smartphone. In Proc. the 7th Int. Conf. Mobile Computing and Ubiquitous Networking, January 2014, pp.85-86.Matsuyama S, Yamabe T, Takahashi N, Kiyohara R. Intelligent user interface of smartphones for on-vehicle information devices. Procedia Computer Science, 2014, 35: 1635-1643.Kovacevic B, Kovacevic M, Maruna T, Papp I. A java application programming interface for in-vehicle infotainment devices. IEEE Trans. Consumer Electronics, 2017, 63(1): 68-76.Liu R L, Liu H Z, Kwak D, Xiang Y, Borcea C, Nath B, Iftode L. Themis: A participatory navigation system for balanced traffic routing. In Proc. IEEE Vehicular Networking Conf., December 2014, pp.159-166.Liu R L, Liu H Z, Kwak D, Xiang Y, Borcea C, Nath B, Iftode L. Balanced traffic routing: Design, implementation, and evaluation. Ad Hoc Networks, 2016, 37: 14-28.Vochin M, Zoican S, Borcoci E. Intelligent system for vehicle navigation assistance. In Proc. World Conf. Information Systems and Technologies, April 2017, pp.142-148.Sha W J, Kwak D, Nath B, Iftode L. Social vehicle navigation: Integrating shared driving experience into vehicle navigation. In Proc. the 14th Workshop on Mobile Computing Systems and Applications, February 2013, Article No. 16.Kwak D, Liu R L, Kim D, Nath B, Iftode L. Seeing is believing: Sharing real-time visual traffic information via vehicular clouds. IEEE Access, 2016, 4: 3617-3631.Djajadi A, Putra R J. Inter-cars safety communication system based on Android smartphone. In Proc. IEEE Conf. Open Systems, October 2014, pp.12-17.Dorairaj P, Mohammed A, Grbic N. Location-Aware services using Android mobile operating platform for safety, emergency and health applications. In Mobile Health, Adibi S (ed.), Springer, 2015, pp.283-298.Dorairaj P, Ramamoorthy S, Ramalingam A K. Emergency based remote collateral tracking system using Google’s Android mobile platform. In Advances in Computer Science Engineering & Applications, Wyld D C, Zizka J, Nagamalai D (eds.), Springer, 2012, pp.391-403.Zulkafi A Z, Basri S, Jung L T, Ahmad R. Android based car alert system. In Proc. the 3rd Int. Conf. Computer and Information Sciences, August 2016, pp.501-506.Tornell S M, Calafate C T, Cano J C, Manzoni P, Fogue M, Martinez F J. Evaluating the feasibility of using smartphones for ITS safety applications. In Proc. the 77th IEEE Vehicular Technology Conf., June 2013.Tornell S M, Patra S, Calafate C T, Cano J C, Manzoni P. GRCBox: Extending smartphone connectivity in vehicular networks. International Journal of Distributed Sensor Networks, 2015, 2015: Article No. 5.Mirkovic J, Dietrich S, Dittrich D, Reiher P. Internet Denial of Service: Attack and Defense Mechanisms (Radia Perlman Computer Networking and Security). Prentice Hall PTR, 2004.Chen S, Xu J, Sezer E C, Gauriar P, Iyer R K. Non-control-data attacks are realistic threats. In Proc. the 14th Conf. USENIX Security Symp., July 31-August 5, 2005.Fung C K, Lee M C. A denial-of-service resistant public-key authentication and key establishment protocol. In Proc. the 21st IEEE Int. Performance Computing and Communications Conf., April 2002, pp.171-178.Abadi M, Budiu M, Erlingsson Ú, Ligatti J. Control-flow integrity. In Proc. the 12th ACM Conf. Computer and Communications Security, November 2005, pp.340-353

Cognitive Neuro-Rehabilitation of HIV-Associated Neurocognitive Disorders : Case Reports of A New Computer-Based Restorative Approach In 3 Hiv-Positive Cart-Treated Patients

At enrolment (T0) three on combination antiretroviral therapy (cART) HIV-positive patients with HIV Associated Neurocognitive Disorders (HAND) were enrolled to undergo a computer-based rehabilitation program (https://dynamicbrain.brainhq.com/) for 12 weeks, under the supervision of a physician. At the end (T1), the patients were tested again with a neuropsychological battery. Patient 1 (current CD4 T-cell count 405/mmc, HIV-RNA < 40UI/ml) had a diagnosis of mild neurocognitive disorders (MND) at T0 and normal evaluation at T1. Patient 2 (current CD4 T-cell count 366/mmc, HIV-RNA < 40UI/ml) had asymptomatic neurocognitive disorders (ANI) at T0 and normal performance at T1. Patient 3 (current CD4 T-cell count 522/mmc, HIV-RNA < 40UI/ml) had MND at T0 and normal performances at T1. Patients\u2019 adherence to the program was 100%. Our pilot experience with a computer-based restorative approach showed good results in term of improvement in neuropsychological performances in treated HIV+ patients. These data suggest the need to explore innovative ways to manage HAND

Determination of the b quark mass at the M_Z scale with the DELPHI detector at LEP

An experimental study of the normalized three-jet rate of b quark events with respect to light quarks events (light= \ell \equiv u,d,s) has been performed using the CAMBRIDGE and DURHAM jet algorithms. The data used were collected by the DELPHI experiment at LEP on the Z peak from 1994 to 2000. The results are found to agree with theoretical predictions treating mass corrections at next-to-leading order. Measurements of the b quark mass have also been performed for both the b pole mass: M_b and the b running mass: m_b(M_Z). Data are found to be better described when using the running mass. The measurement yields: m_b(M_Z) = 2.85 +/- 0.18 (stat) +/- 0.13 (exp) +/- 0.19 (had) +/- 0.12 (theo) GeV/c^2 for the CAMBRIDGE algorithm. This result is the most precise measurement of the b mass derived from a high energy process. When compared to other b mass determinations by experiments at lower energy scales, this value agrees with the prediction of Quantum Chromodynamics for the energy evolution of the running mass. The mass measurement is equivalent to a test of the flavour independence of the strong coupling constant with an accuracy of 7 permil.Comment: 24 pages, 10 figures, Accepted by Eur. Phys. J.

Study of Leading Hadrons in Gluon and Quark Fragmentation

The study of quark jets in e+e- reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However, our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo Simulations with JETSET (with and without Bose-Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (<~ 2 GeV/c^2) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD.Comment: 19 pages, 6 figures, Accepted by Phys. Lett.

Measurement and Interpretation of Fermion-Pair Production at LEP energies above the Z Resonance

This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e+e- -> ffbar process for centre-of-mass energies above the Z resonance, from sqrt(s) ~ 130 - 207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e+e- -> ffbar scattering and several models which include physics beyond the Standard Model: the exchange of Z' bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of sneutrino in R-parity violating supersymmetry.Comment: 79 pages, 16 figures, Accepted by Eur. Phys. J.

Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC

The uncertainty on the calorimeter energy response to jets of particles is derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the calorimeter response to single isolated charged hadrons is measured and compared to the Monte Carlo simulation using proton-proton collisions at centre-of-mass energies of sqrt(s) = 900 GeV and 7 TeV collected during 2009 and 2010. Then, using the decay of K_s and Lambda particles, the calorimeter response to specific types of particles (positively and negatively charged pions, protons, and anti-protons) is measured and compared to the Monte Carlo predictions. Finally, the jet energy scale uncertainty is determined by propagating the response uncertainty for single charged and neutral particles to jets. The response uncertainty is 2-5% for central isolated hadrons and 1-3% for the final calorimeter jet energy scale.Comment: 24 pages plus author list (36 pages total), 23 figures, 1 table, submitted to European Physical Journal

A Determination of the Centre-of-Mass Energy at LEP2 using Radiative 2-fermion Events

Using e+e- -> mu+mu-(gamma) and e+e- -> qqbar(gamma) events radiative to the Z pole, DELPHI has determined the centre-of-mass energy, sqrt{s}, using energy and momentum constraint methods. The results are expressed as deviations from the nominal LEP centre-of-mass energy, measured using other techniques. The results are found to be compatible with the LEP Energy Working Group estimates for a combination of the 1997 to 2000 data sets.Comment: 20 pages, 6 figures, Accepted by Eur. Phys. J.

Study of Tau-pair Production in Photon-Photon Collisions at LEP and Limits on the Anomalous Electromagnetic Moments of the Tau Lepton

Tau-pair production in the process e+e- -> e+e-tau+tau- was studied using data collected by the DELPHI experiment at LEP2 during the years 1997 - 2000. The corresponding integrated luminosity is 650 pb^{-1}. The values of the cross-section obtained are found to be in agreement with QED predictions. Limits on the anomalous magnetic and electric dipole moments of the tau lepton are deduced.Comment: 20 pages, 9 figures, Accepted by Eur. Phys. J.

Standalone vertex finding in the ATLAS muon spectrometer

A dedicated reconstruction algorithm to find decay vertices in the ATLAS muon spectrometer is presented. The algorithm searches the region just upstream of or inside the muon spectrometer volume for multi-particle vertices that originate from the decay of particles with long decay paths. The performance of the algorithm is evaluated using both a sample of simulated Higgs boson events, in which the Higgs boson decays to long-lived neutral particles that in turn decay to bbar b final states, and pp collision data at √s = 7 TeV collected with the ATLAS detector at the LHC during 2011