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International Conference on Information Fusion

作者： Benjamin Noack Florian Pfaff Marcus Baum Uwe D. Hanebeck Intelligent Sensor-Actuator-Systems Laboratory (ISAS) Institute for Anthropomatics and Robotics Karlsruhe Institute of Technology (KIT) Germany Institute of Computer Science University of G?ttingen Germany

ISBN: (纸本)9781509020126

State estimation concepts like the Kalman filter heavily rely on potentially noisy sensor data. In general, the estimation quality depends on the amount of sensor data that can be exploited. However, missing observations do not necessarily impair the estimation quality but may also convey exploitable information on the system state. This type of information-noted as negative information-often requires specific measurement and noise models in order to take advantage of it. In this paper, a hybrid Kalman filter concept is employed that allows using both stochastic and set-membership representations of information. In particular, the latter representation is intended to account for negative information, which can often be easily described as a bounded set in the measurement space. Depending on the type of information, the filtering step of the proposed estimator adaptively switches between Gaussian and ellipsoidal noise representations. A target tracking scenario is studied to evaluate and discuss the proposed concept.

关键词： Robot sensing systems Kalman filters State estimation Radar tracking Ellipsoids Covariance matrices State estimation Manipulator sensing systems Kalman filters Ellipsoid radar target tracking metric space Sensor Data variance covariance matrix Covariance matrix

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Energy-Efficient Beamforming for Two-Tier Massive MIMO Downlink

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China Communications 2015年第10期12卷 64-75页

作者： XU Guozhen LIU An JIANG Wei XIANG Haige LUO Wu China Mobile Research Institute & The State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Department of Electrical and Computer Engineering Hong Kong University of Science and Technology The State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University

Heterogeneous networks(HetNets)consisting of macro cells with very large antenna arrays and a secondary tier of small cells with a few antennas each can well tackle the contradiction of large coverage of the network and high data rate at the hot ***,it is not permissible to assign orthogonal pilot sequences for all the supported users due to the large ***,we propose a pilot reduction scheme based on the heterogeneous system configurations and the unique topology of this *** reusing of pilot sequences causes the presence of the contaminated channel state information(CSI) and results in receivers' Quality of Service(QoS) *** the contaminated CSI,we provide an energy-efficient beamforming based on minimizing the total power consumption while keeping the QoS constraints satisfied and restricting the QoS outage probability below a given *** applying the approach of Bernstein approximation and semi-definite relaxation,we transform the original intractable chance constrained program to a convex problem *** results show that the average power consumption of the proposed beamforming for our pilot reduction scheme is close to that of the perfect CSI *** our scheme will greatly compress the length of pilot sequence especially for those highly densified network with large number of small cells,it will be crucially helpful to put such two-tier massive multiple-input and multiple-output(MIMO) systems into practice.

关键词： massive MIMO small cell Het-Net energy efficiency

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Experimental Analysis of File Transfer Rates Over Wide-Area Dedicated Connections

Experimental Analysis of File Transfer Rates Over Wide-Area ...

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IEEE International Conference on High Performance Computing and Communications

作者： Nageswara S. V. Rao Qiang Liu Satyabrata Sen Greg Hinkel Neena Imam Ian Foster Rajkumar Kettimuthu Bradley W. Settlemyer Chase Q. Wu Daqing Yun Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN 37831 Mathematics and Computer Science Division Argonne National Laboratory Argonne IL 60439 Systems Integration Group Los Alamos National Laboratory Los Alamos NM 87545 Department of Computer Science New Jersey Institute of Technology Newark NJ 07102

ISBN: (纸本)9781509042982

File transfers over dedicated connections, supported by large parallel filesystems, have become increasingly important in high-performance computing and big data workflows. It remains a challenge to achieve peak rates for such transfers due to the complexities of file I/O, host, and network transport subsystems, and equally importantly, their interactions. We present extensive measurements of disk-to-disk file transfers using Lustre and XFS filesystems mounted on multi-core servers over a suite of 10 Gbps emulated connections with 0-366 ms round trip times. Our results indicate that large buffer sizes and many parallel flows do not always guarantee high transfer rates. Furthermore, large variations in the measured rates necessitate repeated measurements to ensure confidence in inferences based on them. We propose a new method to efficiently identify the optimal joint file I/O and network transport parameters using a small number of measurements. We show that for XFS and Lustre with direct I/O, this method identifies configurations achieving 97% of the peak transfer rate while probing only 12% of the parameter space.

关键词： profiling overhead Wide area transport dedicated connections TCP RTT throughput file I/O read and write profiling

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Galactic transient sources with the Cherenkov Telescope Array Observatory

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Monthly Notices of the Royal Astronomical Society 2025年第1期540卷 205–238页

作者： Abe, K Abe, S Abhir, J Abhishek, A Acero, F Acharyya, A Adam, R Aguasca-Cabot, A Agudo, I Aguirre-Santaella, A Alfaro, J Alfaro, R Alvarez-Crespo, N Alves Batista, R Amans, J-P Amato, E Ambrosi, G Ambrosino, F Angüner, E O Antonelli, L A Aramo, C Arcaro, C Arnesen, T T H Asano, K Ascasibar, Y Aschersleben, J Ashkar, H Augusto Stuani, L Baack, D Backes, M Balazs, C Balbo, M Baquero Larriva, A Barbosa Martins, V Barres de Almeida, U Barrio, J A Barrios-Jiménez, L Batković, I Batzofin, R Baxter, J Becerra González, J Becker Tjus, J Belmont, R Benbow, W Bernete, J Bernlöhr, K Berti, A Bertucci, B Beshley, V Bhattacharjee, P Bhattacharyya, S Bigongiari, C Bissaldi, E Blanch, O Blazek, J Bocchino, F Boisson, C Bolmont, J Bonnoli, G Bonollo, A Bordas, P Bosnjak, Z Bottacini, E Böttcher, M Bradascio, F Bronzini, E Brown, A M Brunelli, G Bulgarelli, A Burelli, I Burger-Scheidlin, C Burmistrov, L Burton, M Buscemi, M Cailleux, J Campoy-Ordaz, A Cantlay, B K Capasso, G Caproni, A Capuzzo-Dolcetta, R Caraveo, P Caroff, S Carosi, A Carosi, R Carquin, E Carrasco, M-S Cascone, E Cassol, F Castaldini, L Castrejon, N Castro-Tirado, A J Cerasole, D Ceribella, G Cerruti, M Chadwick, P M Chaty, S Chen, A W Chernyakova, M Chiavassa, A Chudoba, J Chytka, L Cicciari, G M Cifuentes, A Coimbra Araujo, C H Colapietro, M Conforti, V Contreras, J L Cortina, J Costa, A Costantini, H Cotter, G Cristofari, P Cuevas, O Curtis-Ginsberg, Z D’Aì, A D’Amico, G D’Ammando, F Dai, S Dazzi, F de Bony de Lavergne, M De Caprio, V De Cesare, G De Frondat Laadim, F de Gouveia Dal Pino, E M De Lotto, B De Lucia, M de Martino, D de Menezes, R de Naurois, M de Ona Wilhelmi, E de Souza, V del Peral, L del Valle, M V Delgado, C Dell’aiera, M Della Valle, M della Volpe, D Depaoli, D Devin, J Di Girolamo, T Di Piano, A Di Pierro, F Di Tria, R Di Venere, L Diebold, S Dignam, C Dima, R Dinesh, A Djuvsland, J Dominik, R M Dominis Prester, D Donini, A Dorner, D Dörner, J Doro, M Dubos, C Ducci, L Dwarkadas, V V Ebr, J Eckner, C Egberts, K Einecke, S Elsässer, D Emery Department of Physics Tokai University 4-1-1 Kita-Kaname Hiratsuka Kanagawa 259-1292 Japan Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-ha Kashiwa Chiba 277-8582 Japan ETH Zürich Institute for Particle Physics and Astrophysics Otto-Stern-Weg 5 CH-8093 Zürich Switzerland INFN and Università degli Studi di Siena Dipartimento di Scienze Fisiche della Terra e dell’Ambiente (DSFTA) Sezione di Fisica Via Roma 56 I-53100 Siena Italy Université Paris-Saclay Université Paris Cité CEA CNRS AIM F-91191 Gif-sur-Yvette Cedex France FSLAC IRL 2009 CNRS/IAC E-38205 La Laguna Tenerife Spain University of Alabama Tuscaloosa Department of Physics and Astronomy Gallalee Hall Box 870324 Tuscaloosa AL 35487-0324 USA Université Côte d’Azur Observatoire de la Côte d’Azur CNRS Laboratoire Lagrange UF 06304 Nice France Laboratoire Leprince-Ringuet CNRS/IN2P3 École Polytechnique Institut Polytechnique de Paris F-91120 Palaiseau France Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona IEEC-UB Martí i Franquès 1 E-08028 Barcelona Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n E-18008 Granada Spain Institute for Computational Cosmology and Department of Physics Durham University South Road Durham DH1 3LE UK Pontificia Universidad Católica de Chile Av. Libertador Bernardo O’Higgins 340 8331150 Santiago Chile Universidad Nacional Autónoma de México Delegación Coyoacán 04510 Ciudad de México Mexico IPARCOS-UCM Instituto de Física de Partículas y del Cosmos and EMFTEL Department Universidad Complutense de Madrid E-28040 Madrid Spain Instituto de Física Teórica UAM/CSIC and Departamento de Física Teórica Universidad Autónoma de Madrid c/ Nicolás Cabrera 13-15 Campus de Cantoblanco UAM E-28049 Madrid Spain LUTH GEPI and LERMA Observatoire de Paris Université PSL Université Paris Cité CNRS 5 place Jules Janssen F-92190 Meudon France INAF – Osservatorio

A wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low- and high-mass X-ray binaries containing compact objects, isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar-wind nebulae. Although most of them can show emission up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. In this paper, we explore the feasibility of detecting new Galactic transients with the Cherenkov Telescope Array Observatory (CTAO) and the prospects for studying them with Target of Opportunity observations. We show that CTAO will likely detect new sources in the TeV regime, such as the massive microquasars in the Cygnus region, low-mass X-ray binaries with low-viewing angle, flaring emission from the Crab pulsar-wind nebula or other novae explosions, among others. Since some of these sources could also exhibit emission at larger time-scales, we additionally test their detectability at longer exposures. We finally discuss the multiwavelength synergies with other instruments and large astronomical facilities.

关键词： binaries: general stars: magnetars novae cataclysmic variables pulsars: general gamma-rays: general

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Non-Gaussian postselection and virtual photon subtraction in continuous-variable quantum key distribution

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Physical Review A 2016年第1期93卷 012310-012310页

作者： Zhengyu Li Yichen Zhang Xiangyu Wang Bingjie Xu Xiang Peng Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Computational Science and Engineering and Center for Quantum Information Technology School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu 610041 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China

Photon subtraction can enhance the performance of continuous-variable quantum key distribution (CV QKD). However, the enhancement effect will be reduced by the imperfections of practical devices, especially the limited efficiency of a single-photon detector. In this paper, we propose a non-Gaussian postselection method to emulate the photon substraction used in coherent-state CV QKD protocols. The virtual photon subtraction not only can avoid the complexity and imperfections of a practical photon-subtraction operation, which extends the secure transmission distance as the ideal case does, but also can be adjusted flexibly according to the channel parameters to optimize the performance. Furthermore, our preliminary tests on the information reconciliation suggest that in the low signal-to-noise ratio regime, the performance of reconciliating the postselected non-Gaussian data is better than that of the Gaussian data, which implies the feasibility of implementing this method practically.

关键词： Quantum cryptography

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Improving PAC Exploration Using the Median of Means 16

Improving PAC Exploration Using the Median of Means

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Annual Conference on Neural Information Processing systems

作者： Jason Pazis Ronald Parr Jonathan P. How Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Computer Science Duke University Durham NC 27708 Aerospace Controls Laboratory Department of Aeronautics and Astronautics Massachusetts Institute of Technology Cambridge MA 02139 USA

ISBN: (纸本)9781510838819

We present the first application of the median of means in a PAC exploration algorithm for MDPs. Using the median of means allows us to significantly reduce the dependence of our bounds on the range of values that the value function can take, while introducing a dependence on the (potentially much smaller) variance of the Bellman operator. Additionally, our algorithm is the first algorithm with PAC bounds that can be applied to MDPs with unbounded rewards.

关键词： Median perturbed angular correlation Economic Resources Markov chain Exploration algorithms Bound DEPENDENCE

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A Novel Extended Potential Field Controller for Use on Aerial Robots

A Novel Extended Potential Field Controller for Use on Aeria...

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IEEE International Conference on Automation Science and Engineering

作者： Alexander C. Woods Hung M. La Quang P. Ha Advanced Robotics and Automation Laboratory Department of Computer Science and Engineering University of Nevada Reno 89557 USA School of Electrical Mechanical and Mechatronic Systems University of Technology Sydney Australia

ISBN: (纸本)9781509024100

Unmanned Aerial Vehicles (UAV), commonly known as drones, have many potential uses in real world applications. Drones require advanced planning and navigation algorithms to enable them to safely move through and interact with the world around them. This paper presents an extended potential field controller (ePFC) which enables an aerial robot, or drone, to safely track a dynamic target location while simultaneously avoiding any obstacles in its path. The ePFC outperforms a traditional potential field controller (PFC) with smoother tracking paths and shorter settling times. The proposed ePFC's stability is evaluated by Lyapunov approach, and its performance is simulated in a Matlab environment. Finally, the controller is implemented on an experimental platform in a laboratory environment which demonstrates the effectiveness of the controller.

关键词： Drones Navigation Robot sensing systems Target tracking Stability analysis

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RCP Evaluation of Electrolytic Capacitor Degradation for SMPS Failure Prediction

RCP Evaluation of Electrolytic Capacitor Degradation for SMP...

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Annual IEEE Applied Power Electronics Conference and Exposition

作者： Hiroshi Nakao Yu Yonezawa Yoshiyasu Nakashima Fujio Kurokawa Computer Systems Laboratory Fujitsu Laboratories LTD. Kawasaki-Shi Japan Dept. of Advanced Technology and Science for Sustainable Development Nagasaki University Bunkyo-Machi Japan

ISBN: (纸本)9781467395519

This paper presents a new cost effective method for a failure prediction of a digitally controlled Switching Mode Power Supply (SMPS). Electrolytic capacitor is known as one of the highest failure rate components in SMPS, so we tried to detect an Equivalent Series Resistance (ESR) degradation of the electrolytic capacitor directly from the data fetched to a digital controller of SMPS. With a SPICE simulation and a Rapid Control Prototyping (RCP) evaluation, we confirm the degradation can be detected by the data at a transient response under a normal operation. Even only 10 percent of a load step change, which commonly occurs in SMPS for servers, causes detectable transient response degradation.

关键词： Rapid Control Prototyping RCP Electrolytic Capacitor Failure Prediction Server power supply

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Cooperation and Networking in an Underwater Network composed by Heterogeneous Assets

Cooperation and Networking in an Underwater Network composed...

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OCEANS MTS/IEEE Monterey (Conference)

作者： Jose Braga Ricardo Martins Chiara Petrioli Roberto Petroccia Luigi Picari Underwater Systems and Technology Laboratory Faculty of Engineering Porto University Computer Science Department University of Rome "La Sapienza" NATO STO CMRE - Centre for Maritime Research and Experimentation

ISBN: (纸本)9781509015276

Underwater communication and robot technologies have grown rapidly in the last decade. systems made of underwater unmanned vehicles have moved from single vehicle deployments to systems comprising teams of assets. As of today the possibility to support cooperation and interoperability of heterogeneous platforms is a key issue. The objective of this paper is to present the SUNRISE [1] approach to overcome this limitation through the development of an abstraction layer to support the interoperability of different vehicle control software. SUNRISE also aims at integrating control software with the underwater communication and networking components to create more flexible, modular and capable underwater systems. The developed SUNRISE infrastructure has been evaluated and validated through in lab tests and at-sea experiments, in the Porto harbour, during the REP14 sea trial in the Atlantic Ocean and in the Mediterranean coast of Italy in June 2015, showing promising results. The authors gratefully acknowledge CMRE team, Sapienza team and the Portuguese Navy for their valuable feedback and for their support and help during the REP14 sea trial.

关键词： Underwater Wireless Sensor Networks Autonomous Underwater Vehicle Remote Control DUNE ROS MOOS SUNSET S-SDCS SUNRISE

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DTI changes of thalamic subregions in genetic frontotemporal dementia: findings from the GENFI cohort

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Alzheimer's & Dementia 2023年第S24期19卷

作者： Sonja Soskic Henry F. J. Tregidgo Emily G. Todd Arabella Bouzigues David M Cash Lucy L. Russell David L Thomas Ian B Malone John C. van Swieten Lize C. Jiskoot Harro Seelaar Barbara Borroni Daniela Galimberti Raquel Sanchez-Valle Robert Laforce Jr. Fermin Moreno Matthis Synofzik Caroline Graff Mario Masellis Carmela Tartaglia James B. Rowe Rik Vandenberghe Elizabeth Finger Fabrizio Tagliavini Alexandre Mendonca Isabel Santana Christopher R. Butler Simon Ducharme Alexander Gerhard Johannes Levin Markus Otto Sandro Sorbi Isabelle Le Ber Florence Pasquier Daniel C Alexander Juan Eugenio Iglesias Jonathan D. Rohrer Martina Bocchetta the GENetic Frontotemporal dementia Initiative (GENFI) Centre for Medical Image Computing University College London London United Kingdom SonjaSoskic Centre for Medical Image Computing University College London London United Kingdom. Dementia Research Centre Department of Neurodegenerative Disease UCL Queen Square Institute of Neurology University College London London United Kingdom UCL Centre for Medical Image Computing London United Kingdom Neuroradiological Academic Unit Department of Brain Repair and Rehabilitation UCL Queen Square Institute of Neurology University College London London United Kingdom Department of Neurology and Alzheimer Center Erasmus Medical Center Rotterdam Netherlands Centre for Neurodegenerative Disorders Neurology Unit Department of Clinical and Experimental Sciences University of Brescia Brescia Italy Department of Biomedical Surgical and Dental Sciences University of Milan Milan Italy Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy Neurology Department Hospital Clinic Institut d'Investigacions Biomediques Barcelona Spain Clinique Interdisciplinaire de Mémoire Département des Sciences Neurologiques CHU de Québec and Faculté de Médecine Université Laval Quebec City QC Canada Hospital Universitario Donostia San Sebastian Spain Division Translational Genomics of Neurodegenerative Diseases Hertie Institute for Clinical Brain Research (HIH) University of Tübingen Tübingen Germany German Center for Neurodegenerative Diseases (DZNE) Tübingen Germany Karolinska Institutet Department NVS Division of Neurogeriatrics Stockholm Sweden Unit for Hereditary Dementia Theme Inflammation and Aging Karolinska University Hospital-Solna Stockholm Sweden Campbell Cognitive Neurology Research Unit Sunnybrook Research Institute Toronto ON Canada Toronto Western Hospital Tanz Centre for Research in Neurodegenerative Disease Toronto ON Canada Department of Clinical Neurosciences and Cambridge University Hospitals NHS Trust and Medical Research Council Cognition and Brain Sci

Background Atrophy of thalamic subregions has been observed across the spectrum of frontotemporal dementia (FTD). To gain better insight into underlying tissue changes, we investigated how thalamic subregional fractional anisotropy (FA) and mean diffusivity (MD) derived from diffusion tensor imaging (DTI) are altered in genetic FTD. Method We used our newly developed thalamus segmentation tool, which jointly combines structural and diffusion input MRI data, to segment thalami and extract thalamic subregional FA and MD values for 163 genetic mutation carriers and 126 non-carriers with suitable 3T MRI data from the GENetic FTD Initiative (GENFI). Mutation carriers were divided according to their genetic diagnosis and CDR®+NACC FTLD global scores into presymptomatic/prodromal (≤0.5: 41 C9orf72 , 59 GRN , 34 MAPT ) and symptomatic (≥1: 8 C9orf72 , 11 GRN , 10 MAPT ) groups. Mean FA and MD values for thalamic subregions were obtained using diffusion tensors interpolated in the log domain and weighted by segmentation posterior probabilities. Thalamic subregional FA and MD values for presymptomatic and symptomatic mutation carriers within each genetic group were compared with non-carriers using analysis of covariance with bootstrapping, where age, scanner type, and sex were covariates. We corrected for multiple comparisons and calculated percentage changes in adjusted FA and MD mean values for mutation carriers relative to non-carriers. Result The only significant change at the presymptomatic stage was found for C9orf72 expansion carriers, who showed FA reduction in the intralaminar subregion (5%) (Figure 1, Table 1). In symptomatic C9orf72 expansion carriers, FA was reduced in the laterodorsal (21%), lateral posterior (13%), anteroventral (13%) and intralaminar (11%) subregions. Symptomatic MAPT mutation carriers also showed FA reduction in the laterodorsal (15%) and anteroventral (11%) subregions. No significant FA reductions were found for GRN mutation carriers and no s

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