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Combined search in dwarf spheroidal galaxies for branon dark matter annihilation signatures with the MAGIC telescopes

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Journal of Cosmology and Astroparticle Physics 2025年第3期2025卷 020-020页

作者： Abe, S. Abhir, J. Abhishek, A. Acciari, V.A. Aguasca-Cabot, A. Agudo, I. Aniello, T. Ansoldi, S. Arbet Engels, A. Arcaro, C. Asano, K. Baack, d. Babić, A. Barres de Almeida, U. Barrio, J.A. Batković, I. Bautista, A. Baxter, J. Becerra González, J. Bednarek, W. Bernardini, E. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Ž. Bronzini, E. Burelli, I. Campoy-Ordaz, A. Carosi, r. Carretero-Castrillo, M. Castro-Tirado, A.J. Cerasole, d. Ceribella, G. Chai, Y. Cifuentes, A. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. da Vela, P. dazzi, F. de Angelis, A. de Lotto, B. de Menezes, r. delgado, J. delgado Mendez, C. di Pierro, F. di Tria, r. di Venere, L. dominis Prester, d. donini, A. dorner, d. doro, M. Elsaesser, d. Escudero, J. Fariña, L. Fattorini, A. Foffano, L. Font, L. Fröse, S. Fukami, S. Fukazawa, Y. García López, r.J. Garczarczyk, M. Gasparyan, S. Gaug, M. Giesbrecht Paiva, J.G. Giglietto, N. Giordano, F. Gliwny, P. Gradetzke, T. Grau, r. Green, d. Green, J.G. Günther, P. Hadasch, d. Hahn, A. Hassan, T. Heckmann, L. Herrera Llorente, J. Hrupec, d. Imazawa, r. Ishio, K. Jiménez Martínez, I. Jormanainen, J. Kankkunen, S. Kayanoki, T. Kerszberg, d. Kluge, G.W. Kobayashi, Y. Kouch, P.M. Kubo, H. Kushida, J. Láinez, M. Lamastra, A. Leone, F. Lindfors, E. Lombardi, S. Longo, F. López-Coto, r. López-Moya, M. López-Oramas, A. Loporchio, S. Lorini, A. Lyard, E. Majumdar, P. Makariev, M. Maneva, G. Manganaro, M. Mangano, S. Mannheim, K. Mariotti, M. Martínez, M. Martínez-Chicharro, M. Mas-Aguilar, A. Mazin, d. Menchiari, S. Mender, S. Miceli, d. Miener, T. Miranda, J.M. Mirzoyan, r. Molero González, M. Molina, E. Mondal, H.A. Moralejo, A. Morcuende, d. Nakamori, T. Nanci, C. Neustroev, V. Nievas rosillo, M. Nigro, C. Nikolić, L. Nishijima, K. Njoh Ekoume, T. Nozaki, S. Okumura, A. Otero-Santos, J. Paiano, S. Paneque, d. Paoletti, r. Paredes, J.M. Peresano, M. Persic, M. Pihet, M. Pirola, G. Podobnik, F. Prada Moroni, P.G. Prandini, E. Principe, G. rhode, W. ribó, M. r Japanese MAGIC Group Institute for Cosmic Ray Research (ICRR) The University of Tokyo Chiba Kashiwa 277-8582 Japan ETH Zürich Zürich CH-8093 Switzerland Università di Siena INFN Pisa Siena I-53100 Italy Institut de Física d'Altes Energies (IFAE) The Barcelona Institute of Science and Technology (BIST) Bellaterra Barcelona E-08193 Spain Universitat de Barcelona ICCUB IEEC-UB Barcelona E-08028 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada 18008 Spain National Institute for Astrophysics (INAF) Rome I-00136 Italy Università di Udine INFN Trieste Udine I-33100 Italy Max-Planck-Institut für Physik Garching D-85748 Germany Università di Padova INFN Padova I-35131 Italy Technische Universität Dortmund Dortmund D-44221 Germany Croatian MAGIC Group University of Zagreb Faculty of Electrical Engineering and Computing (FER) Zagreb 10000 Croatia Centro Brasileiro de Pesquisas Físicas (CBPF) URCA RJ Rio de Janeiro 22290-180 Brazil IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid Madrid E-28040 Spain Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna La Laguna Tenerife E-38200 Spain University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz 90-236 Poland Centro de Investigaciones Energéticas Medioambientales y Tecnológicas Madrid E-28040 Spain Departament de Física CERES-IEEC Universitat Autònoma de Barcelona Bellaterra E-08193 Spain Università di Pisa INFN Pisa Pisa I-56126 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica dell'Università e del Politecnico di Bari Bari I-70125 Italy Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino Torino I-10125 Italy Croatian MAGIC Group University of Rijeka Faculty of Physics Rijeka 51000 Croatia Universität Würzburg Würzburg D-97074 Germany Japanes

Massive brane fluctuations, called branons, behave as weakly interacting massive particles, which is one of the most favored class of candidates to fulfill the role of the dark matter (dM), an elusive kind of matter beyond the Standard Model. We present a multi-target search in dwarf spheroidal galaxies for branon dM annihilation signatures with a total exposure of 354 hours with the ground-based gamma-ray telescope system MAGIC. This search led to the most constraining limits on branon dM in the sub-TeV and multi-TeV dM mass range. Our most stringent limit on the thermally-averaged annihilation cross-section (at 95% confidence level) corresponds to ⟨σv⟩ ≃ 1.9 × 10^-24 cm³s^-1 at a branon mass of ∼ 1.5 TeV. © 2025 The Author(s)

关键词： cosmology of theories beyond the SM dark matter experiments gamma ray experiments

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Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations

arXiv

引用

arXiv 2025年

作者： Abe, K. Abe, S. Abhir, J. Abhishek, A. Acciari, V.A. Aguasca-Cabot, A. Agudo, I. Aniello, T. Ansoldi, S. Antonelli, L.A. Engels, A. Arbet Arcaro, C. Asano, K. Baack, d. Babić, A. de Almeida, U. Barres Barrio, J.A. Batković, I. Bautista, A. Baxter, J. González, J. Becerra Bednarek, W. Bernardini, E. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Ž. Bronzini, E. Burelli, I. Campoy-Ordaz, A. Carosi, r. Carretero-Castrillo, M. Castro-Tirado, A.J. Cerasole, d. Ceribella, G. Chai, Y. Cifuentes, A. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. d’Amico, G. d’Ammando, F. d’Elia, V. da Vela, P. dazzi, F. de Angelis, A. de Lotto, B. de Menezes, r. delfino, M. delgado, J. Mendez, C. delgado di Pierro, F. di Tria, r. di Venere, L. Prester, d. dominis donini, A. dorner, d. doro, M. Eisenberger, L. Elsaesser, d. Escudero, J. Fariña, L. Fattorini, A. Foffano, L. Font, L. Fröse, S. Fukami, S. Fukazawa, Y. López, r.J. García Garczarczyk, M. Gasparyan, S. Gaug, M. Paiva, J.G. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Godinović, N. Gradetzke, T. Grau, r. Green, d. Green, J.G. Günther, P. Hadasch, d. Hahn, A. Hassan, T. Heckmann, L. Llorente, J. Herrera Hrupec, d. Imazawa, r. Ishio, K. Martínez, I. Jiménez Jormanainen, J. Kankkunen, S. Kayanoki, T. Kerszberg, d. Kluge, G.W. Kouch, P.M. Kubo, H. Kushida, J. Láinez, M. Lamastra, A. Leone, F. Lindfors, E. Lombardi, S. Longo, F. López-Coto, r. López-Moya, M. López-Oramas, A. Loporchio, S. Lorini, A. Majumdar, P. Makariev, M. Maneva, G. Manganaro, M. Mangano, S. Mannheim, K. Mariotti, M. Martínez, M. Martínez-Chicharro, M. Mas-Aguilar, A. Mazin, d. Menchiari, S. Mender, S. Miceli, d. Miener, T. Miranda, J.M. Mirzoyan, r. González, M. Molero Molina, E. Mondal, H.A. Moralejo, A. Morcuende, d. Nakamori, T. Nanci, C. Neustroev, V. Nickel, L. Nigro, C. Nikolić, L. Nilsson, K. Nishijima, K. Ekoume, T. Njoh Noda, K. Nozaki, S. Okumura, A. Otero-Santos, J. Paiano, S. Japanese MAGIC Group Department of Physics Tokai University Kanagawa Hiratsuka259-1292 Japan The University of Tokyo Chiba Kashiwa277-8582 Japan ETH Zürich ZürichCH-8093 Switzerland Università di Siena INFN Pisa SienaI-53100 Italy Bellaterra BarcelonaE-08193 Spain Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain RomeI-00136 Italy Università di Udine INFN Trieste UdineI-33100 Italy Max-Planck-Institut für Physik GarchingD-85748 Germany Università di Padova INFN PadovaI-35131 Italy Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia URCA RJ Rio de Janeiro22290-180 Brazil IPARCOS Institute EMFTEL Department Universidad Com-plutense de Madrid MadridE-28040 Spain Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna La Laguna TenerifeE-38200 Spain University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Università di Pisa INFN Pisa PisaI-56126 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari BariI-70125 Italy Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy Croatian MAGIC Group University of Rijeka Faculty of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany Japanese MAGIC Group: Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan ZeuthenD-15738 Germany Armenian MAGIC Group: ICRANet-Armenia Yerevan0019 Armenia Split21000 Croatia Croatian MAGIC Group J

Aims. Mrk 421 was in its most active state around early 2010, which led to the highest TeV gamma-ray flux ever recorded from any active galactic nuclei (AGN). We aim to characterize the multiwavelength behavior during this exceptional year for Mrk 421, and evaluate whether it is consistent with the picture derived with data from other less exceptional years. Methods. We investigated the period from November 5, 2009, (MJd 55140) until July 3, 2010, (MJd 55380) with extensive coverage from very-high-energy (VHE;E > 100 GeV) gamma rays to radio with MAGIC, VErITAS, Fermi-LAT, rXTE, Swift, GASP-WEBT, VLBA, and a variety of additional optical and radio telescopes. We characterized the variability by deriving fractional variabilities as well as power spectral densities (PSds). In addition, we investigated images of the jet taken with VLBA and the correlation behavior among different energy bands. results. Mrk 421 was in widely different states of activity throughout the campaign, ranging from a low-emission state to its highest VHE flux ever recorded. We find the strongest variability in X-rays and VHE gamma rays, and PSds compatible with power-law functions with indices around 1.5. We observe strong correlations between X-rays and VHE gamma rays at zero time lag with varying characteristics depending on the exact energy band. We also report a marginally significant (∼ 3σ) positive correlation between high-energy (HE;E > 100 MeV) gamma rays and the ultraviolet band. We detected marginally significant (∼ 3σ) correlations between the HE and VHE gamma rays, and between HE gamma rays and the X-ray, that disappear when the large flare in February 2010 is excluded from the correlation study, hence indicating the exceptionality of this flaring event in comparison with the rest of the campaign. The 2010 violent activity of Mrk421 also yielded the first ejection of features in the VLBA images of the jet of Mrk 421. Yet the large uncertainties in the ejection times of these unprece

关键词： Active Galactic Nuclei

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Experimental determination of the solubility of Co in the Cr-based carbides Cr23C6, Cr7C3, and Cr 3C2

Experimental determination of the solubility of Co in the Cr...

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作者： Kaplan, Bartek Markström, Andreas Norgren, Susanne Selleby, Malin Department of Materials Science and Engineering KTH Royal Institute of Technology Stockholm Sweden Sandvik Coromant R and D Stockholm Sweden Thermo-Calc Software AB Stockholm Sweden Ångström Tribomaterials Group Applied Materials Science Uppsala University Uppsala Sweden

Thermodynamic calculations based on the CALPHAd method are nowadays often applied in the design of new materials due to increasing demands on shorter lead times for development. However, such calculations rely heavily on the assessed thermodynamic descriptions, which in turn rely on the amount and quality of available experimental data, especially for binary and ternary sub-systems. The ternary Co-Cr-C system is an extremely important subsystem to, e.g., multi-component cemented carbide grades, such as W-Co-Cr-M-C (M = Ti,Ta,Nb,V,Zr,Hf), as well as Cr-containing Co-base alloys. In the case of the Co-Cr-C system, there is a lack of reliable data on the solubility of Co in Cr-carbides. Therefore, the present work concerns an experimental study of the solubility of Co in all three of the Cr-based carbides, i.e., Cr 23C6, Cr7C3, and Cr 3C2. This was done by synthesizing appropriate samples in the M7C3+M23C6+liquid and M 7C3+M3C2+graphite three-phase fields. The results show that a recent thermodynamic description of the Co-Cr-C system is unable to reproduce the experimentally determined solubilities. Therefore, the present study provides important input for future alloy development and improvement of the thermodynamic description of the Co-Cr-C system. © 2014 The Minerals, Metals & Materials Society and ASM International.

关键词： Carbides

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Object removal and Inpainting from Image using Combined GANs

Object Removal and Inpainting from Image using Combined GANs

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Jeongwon Pyo Yuri Goncalves rocha Arpan Ghosh Kwanghee Lee Gungyo In Taeyoung Kuc College of Information and Communication Engineering Sungkyunkwan University Suwon Korea Robot R&D Group Korea Institute of Industrial Technology Ansan Korea

ISBN: (数字)9788993215205

ISBN: (纸本)9781728185620

As recent research on deep learning methods has been actively conducted, a number of deep learning methods have been proposed. In this paper, we propose a method of removing the desired object from an image using generative adversarial networks(GANs) structure. We composed the network in which two GANs are fused. The first GAN erases the target object from the input image, and the second GAN generates an image that fills the empty space with the background. Through this network, we can erase the desired object from the input image and get an image with the erased part filled with the background without any object detection method. We show that the removal of people and vehicles from images of roads using the CityScapes dataset.

关键词： Generators Generative adversarial networks Training Image segmentation deep learning Annotations Semantics

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Analysis of android robot lip-sync factors affecting communication 16

Analysis of android robot lip-sync factors affecting communi...

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ACM/IEEE International Conference on Human-robot Interaction (HrI)

作者： Hyun-Jun Hyung Byeong-Kyu Ahn Brian Cruz dong-Wook Lee Robot R&D Group Korea Institute of Industrial Technology Ansan South Korea Robotics and Virtual Engineering Korea University of Science & Technology Ansan South Korea

ISBN: (纸本)9781467383707

In this paper, we analyze lip-sync factors affecting communication of android robots. We have generated eight mouth shapes for single vowels based on the Hangul vowel triangle chart. We assume that the mouth shape and lip-sync timing are important factors for communication with android robots. An experiment was conducted in a noisy environment during an exhibition. A total of 120 people were surveyed about how well they understood and why. Unlike the hypothesis, sound is found to be an important factor that affects human understanding. Because experimental results can be affected by noise and whether subjects have seen a robot or not, we will plan to conduct further experiments in a quiet environment after explaining android robots to subjects sufficiently.

关键词： Mouth Shape Humanoid robots Smart phones Androids Timing

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Workspace Analysis of Cable-driven Continuum Manipulator Using Universal Joint

Workspace Analysis of Cable-Driven Continuum Manipulator Usi...

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International Conference on Ubiquitous robots (Ur)

作者： Myung-oh Kim dongwoon Choi duck-Yeon Lee dong-Wook Lee Department of Mechanical Engineering Hanynag University Seoul Korea Applied Robot R&D Department Korea Institute of Industrial Technology (KITECH) Ansan Korea

This paper presents a comprehensive study on the workspace of a continuum manipulator using a universal joint. The research focuses on analyzing the effect of different parameters such as joint angles and flexible link lengths on the workspace of the manipulator. A mathematical model is developed to determine the workspace and validate the results through simulations. The study also includes a discussion on the limitations and challenges of using a universal joint in continuum manipulators and ways to overcome them. The findings of this research contribute to the understanding of the workspace of continuum manipulators and can be used to design more effective and efficient manipulator systems.

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Considerations on Ergonomic deficiencies in Human Factors research from a Psychological Point of View

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IFAC Proceedings Volumes 1985年第10期18卷 213-218页

作者： M. Paetau M. Pieper Man-Machine Communication Research Group of the Institute for Applied Information Technology Gesellschaft für Mathematik und Datenverarbeitung (GMD) D-5205 Sankt Augustin. FRG

As a result of some years of critical discussions about the objectives and methodologies of Human Factors research a new trend of Human Factors research is emerging: “Software Ergomics”. Its central concern is to use the results of ergonomic research not only for enhancing efficiency and ease of use in computer systems but for the general requirement that machines must be adapted to human beings. Many investigations of industrial psychology and sociology have shown that personality traits exist in every problem solving process. However other results of ergonomic research have shown that despite these differences the efficiency of different approaches of task accomplishment tends to be similar. Consequently there is no reason to search for the “one best way” in computer design. This suggests the adaptation of computer interfaces to human beings should follow inter-individual differences of users. This general demand necessitates new reflections about user-control and taskadequate usability of computer systems.

关键词： Man-Machine Communication software ergonomics industrial psychology cognitive regulation of action personality-traits scope of action action sphere

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Trotting gait control of quadruped robot based on Trajectory Planning

Trotting gait control of quadruped robot based on Trajectory...

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World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)

作者： Baoping Ma Ziqian Liu Changwu Peng Xiaoqiang Li R&D Engineer. Laboratory of the Quadruped Robot The 21st Research Institute of China Electronics Technology Group Corporation Shanghai China R & D Engineer The 21st Research Institute of China Electronics Technology Group Corporation Shanghai China

ISBN: (纸本)9781665421737

In order to improve the motion stability and environmental adaptability of quadruped robot in trotting gait, a motion control method based on swing leg gait planning is proposed in this paper. The kinematics model of quadruped robot is established, the forward and inverse solutions are obtained, and the trajectory curve of swinging leg of quadruped robot in trotting gait is planned. The simulation model is established in AdAMS to verify that the trotting gait control method based on the foot trajectory planning of the swing leg is effective and feasible.

关键词： Legged locomotion Adaptation models Torque Trajectory planning Stability analysis Trajectory Quadrupedal robots

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roadmap on Neuromorphic Photonics

arXiv

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arXiv 2025年

作者： Brunner, daniel Shastri, Bhavin J. Al-Qadasi, Mohammed A. Ballani, H. Barbay, Sylvain Biasi, Stefano Bienstman, Peter Bilodeau, Simon Bogaerts, Wim Böhm, Fabian Brennan, G. Buckley, Sonia Cai, Xinlun Strinati, Marcello Calvanese Canakci, B. Charbonnier, Benoit Chemnitz, Mario Chen, Yitong Cheung, Stanley Chiles, Jeff Choi, Suyeon Christodoulides, demetrios N. Chrostowski, Lukas Chu, J. Clegg, J.H. Cletheroe, d. Conti, Claudio dai, Qionghai di Lauro, Luigi diamantopoulos, Nikolaos-Panteleimon dinc, Niyazi Ulas Ewaniuk, Jacob Fan, Shanhui Fang, Lu Franchi, riccardo Freire, Pedro Gentilini, Silvia Gigan, Sylvain Giorgi, Gian Luca Gkantsidis, C. Gladrow, J. Goi, Elena Goldmann, M. Grabulosa, A. Gu, Min Guo, Xianxin Hejda, Matěj Horst, F. Hsieh, Jih-Liang Hu, Jianqi Hu, Juejun Huang, Chaoran Hurtado, Antonio Jaurigue, Lina Kalinin, K.P. Kamalian-Kopae, Morteza Kelly, d.J. Khajavikhan, Mercedeh Kremer, H. Laydevant, Jeremie Lederman, Joshua C. Lee, Jongheon Lenstra, daan Li, Gordon H.Y. Li, Mo Li, Yuhang Lin, Xing Lin, Zhongjin Lis, Mieszko Lüdge, Kathy Lugnan, Alessio Lupo, Alessandro Lvovsky, A.I. Manuylovich, Egor Marandi, Alireza Marchesin, Federico Massar, Serge McCaughan, Adam N. McMahon, Peter L. Moralis-Pegios, Miltiadis Morandotti, roberto Moser, Christophe Moss, david J. Mukherjee, Avilash Nikdast, Mahdi Offrein, B.J. Oguz, Ilker Oripov, Bakhrom O'Shea, G. Ozcan, Aydogan Parmigiani, F. Pasricha, Sudeep Pavanello, Fabio Pavesi, Lorenzo Peserico, Nicola Pickup, L. Pierangeli, davide Pleros, Nikos Porte, Xavier Primavera, Bryce A. Prucnal, Paul Psaltis, demetri Puts, Lukas Qiao, Fei rahmani, B. raineri, Fabrice ríos Ocampo, Carlos A. robertson, Joshua romeira, Bruno roques-Carmes, Charles rotenberg, Nir rowstron, A. Schoenhardt, Steffen Schwartz, russell L.T. Shainline, Jeffrey M. Shekhar, Sudip Skalli, A. Sohoni, Mandar M. Sorger, Volker J. Soriano, Miguel C. Spall, James Stabile, ripalta Stiller, Birgit Sunada, Satoshi Tefas, Anastasios Tossoun, Bassem Tsakyridis, Apostolos Turitsyn, Sergei K. Van der Sande, G Université Marie et Louis Pasteur CNRS UMR 6174 Institut FEMTO-ST Besançon25000 France Centre for Nanophotonics Department of Physics Engineering Physics & Astronomy Queen's University Canada Department of Electrical and Computer Engineering The University of British Columbia Vancouver Canada Microsoft Research Cambridge United Kingdom Université Paris-Saclay CNRS Centre de Nanosciences et de Nanotechnologies France Nanoscience Laboratory Department of Physics University of Trento Italy Photonics Research Group Department of Information Technology Ghent University imec Belgium Princeton University NJ United States Hewlett Packard Labs Hewlett Packard Enterprise Böblingen Germany National Institute of Standards and Technology BoulderCO United States State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-sen University China Enrico Fermi Research Center Rome Italy Université Grenoble-Alpes CEA Leti Grenoble France Leibniz-Institute of Photonic Technology Jena Germany Institute of Applied Optics and Biophysics Jena Germany Department of Automation Tsinghua University Beijing China Department of Electrical and Computer Engineering North Carolina State University NC United States Department of Electrical Engineering Stanford University CA United States University of Southern California Los AngelesCA United States Department of Physics Sapienza University Rome Italy Institute for Complex Systems National Research Council Rome Italy Varennes Canada NTT Device Technology Labs NTT Corporation Kanagawa Atsugi Japan Institute of Electrical and Microengineering School of Engineering École Polytechnique Fédérale de Lausanne Switzerland Edward L. Ginzton Laboratory Stanford University StanfordCA United States Department of Electronic Engineering Tsinghua University China Beijing National Research Center for Information Science and Technology Tsinghua University China Aston Univ

Neuromorphic photonics are processors inspired by the human brain and enabled by light (photons) instead of traditional electronics. Neuromorphic photonics and its associated concepts are experiencing a significant resurgence, building on foundational research from the 1980s and 1990s. This renewed momentum is driven by breakthroughs in photonic integration, nonlinear optics, and advanced materials, alongside the growing necessity of neuro-inspired computing in numerous applications of economic and societal relevance. The increasing demand for energy-efficient artificial intelligence (AI) solutions underscores the need for innovation and a cohesive vision to address key challenges, including scalability, energy efficiency, precision, and standardized performance benchmarks. Together, these efforts present an opportunity to establish a unique photonic advantage with practical, real-world applications. This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementation philosophies reported in the field. It emphasizes the critical role of cross-disciplinary collaboration in this rapidly evolving field. The roadmap introduces various approaches to embedding the high-complexity transformations central to neuromorphic computing, focusing on frequency, delay, and spectral embeddings. This is followed by a discussion of architectures of photonic neural networks (PNNs) and an in-depth analysis of methods for implementing these architectures in photonic hardware. dedicated sections delve into integrated photonic hardware, the realization of photonic weights and memories, and the optimization of training processes for photonic neuromorphic architectures. The roadmap concludes by exploring numerous potential applications, highlighting the challenges and advances necessary to transition neuromorphic photonic computing from a primarily academic pursuit to a technolog

关键词： Philosophical aspects

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Analytic Plane Covariances Construction for Precise Planarity-based Extrinsic Calibration of Camera and LidAr

Analytic Plane Covariances Construction for Precise Planarit...

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IEEE International Conference on robotics and Automation (ICrA)

作者： Gunhee Koo Jaehyeon Kang Bumchul Jang Nakju doh School of Electrical Engineering Korea University Seoul Republic of Korea Robot R&D Group Korea Institute of Industrial Technology Ansan Republic of Korea

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Planarity of checkerboards is a widely used feature for extrinsic calibration of camera and LidAr. In this study, we propose two analytically derived covariances of (i) plane parameters and (ii) plane measurement, for precise extrinsic calibration of camera and LidAr. These covariances allow the graded approach in planar feature correspondences by exploiting the uncertainty of a set of given features in calibration. To construct plane parameter covariance, we employ the error model of 3d corner points and the analytically formulated plane parameter errors. Next, plane measurement covariance is directly derived from planar regions of point clouds using the out-of-plane errors. In simulation validation, our method is compared to an existing uncertainty-excluding method using the different number of target poses and the different levels of noise. In field experiment, we validated the applicability of the proposed analytic plane covariances for precise calibration using the basic planarity-based method and the latest planarity-and-linearity-based method.

关键词： Three-dimensional displays Calibration Cameras Laser radar Linear programming Solid modeling Two dimensional displays

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