检索结果-内蒙古大学图书馆

MT3: Meta Test-Time Training for Self-Supervised Test-Time Adaption

学校读者我要写书评

暂无评论

arXiv 2021年

作者： Bartler, Alexander Bühler, Andre Wiewel, Felix Döbler, Mario Yang, Bin Institute of Signal Processing and System Theory University of Stuttgart Germany

An unresolved problem in Deep Learning is the ability of neural networks to cope with domain shifts during test-time, imposed by commonly fixing network parameters after training. Our proposed method Meta Test-Time Training (MT3), however, breaks this paradigm and enables adaption at test-time. We combine meta-learning, self-supervision and test-time training to learn to adapt to unseen test distributions. By minimizing the self-supervised loss, we learn task-specific model parameters for different tasks. A meta-model is optimized such that its adaption to the different task-specific models leads to higher performance on those tasks. During test-time a single unlabeled image is sufficient to adapt the meta-model parameters. This is achieved by minimizing only the self-supervised loss component resulting in a better prediction for that image. Our approach significantly improves the state-of-the-art results on the CIFAR-10-Corrupted image classification benchmark. Our implementation is available on GitHub1 © 2021, CC BY.

关键词： Deep learning

Experts in the Loop: Conditional Variable Selection for Accelerating Post-Silicon Analysis Based on Deep Learning

学校读者我要写书评

暂无评论

arXiv 2022年

作者： Liao, Yiwen Latty, Raphaël Yang, Bin Institute of Signal Processing and System Theory University of Stuttgart Germany Applied Research and Venture Team Advantest Europe GmbH Germany

Post-silicon validation is one of the most critical processes in modern semiconductor manufacturing. Specifically, correct and deep understanding in test cases of manufactured devices is key to enable post-silicon tuning and debugging. This analysis is typically performed by experienced human experts. However, with the fast development in semiconductor industry, test cases can contain hundreds of variables. The resulting high-dimensionality poses enormous challenges to experts. Thereby, some recent prior works have introduced data-driven variable selection algorithms to tackle these problems and achieved notable success. Nevertheless, for these methods, experts are not involved in training and inference phases, which may lead to bias and inaccuracy due to the lack of prior knowledge. Hence, this work for the first time aims to design a novel conditional variable selection approach while keeping experts in the loop. In this way, we expect that our algorithm can be more efficiently and effectively trained to identify the most critical variables under certain expert knowledge. Extensive experiments on both synthetic and real-world datasets from industry have been conducted and shown the effectiveness of our method. Copyright © 2022, The Authors. All rights reserved.

关键词： Semiconductor device manufacture

Two-Photon Interference of Photons from Remote Tin-Vacancy Centers in Diamond

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Bushmakin, Vladislav von Berg, Oliver Sauerzapf, Colin Jayaram, Sreehari Denisenko, Andrej Tarín, Cristina Anders, Jens Vorobyov, Vadim Gerhardt, Ilja Liu, Di Wrachtrup, Jörg 3. Physikalisches Institut Universität Stuttgart Stuttgart70569 Germany Max Planck Institute for Solid State Research Stuttgart70569 Germany Institute for System Dynamics Universität Stuttgart Stuttgart70563 Germany Institute of Smart Sensors Universität Stuttgart Stuttgart70569 Germany Institut für Festkörperphysik Leibniz Universität Hannover Hannover30167 Germany John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States

Scalable quantum networks rely on optical connections between long-lived qubits to distribute entanglement. Tin vacancies in diamond have emerged as promising qubits, offering extended spin coherence times at liquid helium temperatures and spin-dependent, highly coherent optical transitions for effective photon-based communication. Connecting remote nodes requires quantum interference of indistinguishable photons, which is challenging in an inhomogeneous solid-state environment. Here, we demonstrate a two-node experiment with tin vacancies in diamond, which exhibit a resonant frequency distribution spanning approximately 8 GHz. To overcome the frequency mismatch, we tune the resonant frequencies of one node using the Stark effect. We achieve tunability up to 4 GHz while maintaining optical coherence. As a demonstration, we achieve detuning-dependent remote two-photon interference between separate nodes, obtaining 80(6) % interference visibility without postprocessing when the defects’ optical transitions are tuned into resonance, and 63(8) % with detuning up to 20 times their natural linewidths. These results highlight the potential of tin-vacancy centres in diamond for establishing robust optical links between remote quantum registers. Copyright © 2024, The Authors. All rights reserved.

关键词： Qubits

Optimization-Based Comparative system Evaluation of Single and Dual Traction Inverters with Focus on Partial Load Efficiency and Chip Area

学校读者我要写书评

暂无评论

Optimization-Based Comparative System Evaluation of Single a...

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Christoph Sachs Fabian Stamer Jan Allgeier Duleepa Thrimawithana Martin Neuburger Faculty of Mobility and Technology Esslingen University Germany Institute for System Dynamics University of Stuttgart Germany Robert Bosch GmbH Germany Dept. of Electrical Computer and Software Engineering The University of Auckland New Zealand

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

The transition to electric transportation demands efficient and cost-effective powertrains. Optimizing energy use is crucial for extending range and reducing expenses. However, comparing inverter and motor efficiency based on inverter topologies is challenging due to biased methodologies that favor certain designs over others. This document introduces a novel optimization-based approach for enhancing partial load efficiency and minimizing chip area of single and dual traction inverters, indicating potential energy savings and cost reduction. Recent publications of both industry [1], [2] and academia [3] underscore the importance of these design goals achieved by either novel inverter topologies or enhanced control methods. Two promising topologies with the inherent capability of partial load optimization are evaluated regarding chip area and system efficiency to find the most suitable concept for future electric vehicle power trains.

关键词： MOSFET Costs Silicon carbide Modulation Mechanical power transmission Motors Electric vehicles Inverters Topology Optimization

A MIMO Radar-based Few-Shot Learning Approach for Human-ID

学校读者我要写书评

暂无评论

A MIMO Radar-based Few-Shot Learning Approach for Human-ID

European Signal Processing Conference (EUSIPCO)

作者： Pascal Weller Fady Aziz Sherif Abdulatif Urs Schneider Marco F. Huber Department of Bio-mechatronic Systems Fraunhofer IPA Stuttgart Germany Institute of Signal Processing and System Theory University of Stuttgart Germany Institute for Industrial Manufacturing and Factory Operation IFF University of Stuttgart Germany Fraunhofer IPA Center for Cyber Cognitive Intelligence Stuttgart Germany

ISBN: (数字)9789082797091

ISBN: (纸本)9781665467995

Radar for deep learning-based human identification has become a research area of increasing interest. It has been shown that micro-Doppler $(\mu-\mathbf{D})$ can reflect the walking behavior, through capturing the periodic limbs micro-motions. One of the main aspects is maximizing the number of included classes, while considering the real-time and training dataset size constraints. In this paper, a multiple-input-multiple-output (MIMO) radar is used to formulate micro-motion spectrograms of the elevation angular velocity $(\mu-\omega)$ . The effectiveness of concatenating this newly-formulated spectrogram with the commonly used $\mu-\mathrm{D}$ ones is investigated. To accommodate for non-constrained real walking motion, an adaptive cycle segmentation framework is utilized and a metric learning network is trained on half gait cycles $(\approx 0.5\mathrm{s})$ . Studies on the effects of various numbers of classes (5–20), different dataset sizes, and varying observation time windows (1–2 s) are conducted. A non-constrained walking dataset of 22 subjects is collected with different aspect angles with respect to the radar. The proposed few-shot learning (FSL) approach achieves a classification error of 11.3 % with only 2 min of training data per subject.

关键词： Legged locomotion Training Three-dimensional displays Training data Radar Real-time systems Angular velocity

Stabilization of Predator-Prey Age-Structured Hyperbolic PDE when Harvesting both Species is Inevitable

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Veil, Carina Krstić, Miroslav Karafyllis, Iasson Diagne, Mamadou Sawodny, Oliver Institute for System Dynamics University of Stuttgart Stuttgart70563 Germany Department of Mechanical and Aerospace Engineering University of California La Jolla San DiegoCA92093-0411 United States Department of Mathematics National Technical University of Athens Zografou Campus Athens15780 Greece

Populations (in ecology, epidemics, biotechnology, economics, social processes) do not only interact over time but also age over time. It is therefore common to model them as "age-structured" PDEs, where age is the ‘space variable.’ Since the models also involve integrals over age, both in the birth process and in the interaction among species, they are in fact integro-partial differential equations (IPDEs) with positive states. To regulate the population densities to desired profiles, harvesting is used as input. But non-discriminating harvesting, where wanting to repress one (overpopulated) species will inevitably repress the other (near-extinct) species as well, the positivity restriction on the input (no insertion of population, only removal), and the multiplicative (nonlinear) nature of harvesting, makes control challenging even for ODE versions of such dynamics, let alone for their IPDE versions, on an infinite-dimensional nonnegative state space. With this paper, we introduce a design for a benchmark version of such a problem: a two-population predator-prey setup. The model is equivalent to two coupled ordinary differential equations (ODEs), actuated by harvesting which must not drop below zero, and strongly ("exponentially") disturbed by two autonomous but exponentially stable integral delay equations (IDEs). We develop two control designs. With a modified Volterra-like control Lyapunov function, we design a simple feedback which employs possibly negative harvesting for global stabilization of the ODE model, while guaranteeing regional regulation with positive harvesting. With a more sophisticated, restrained controller we achieve regulation for the ODE model globally, with positive harvesting. For the full IPDE model, with the IDE dynamics acting as large disturbances, for both the simple and saturated feedback laws we provide explicit estimates of the regions of attraction. Simulations illustrate the nonlinear infinite-dimensional solutions under the two f

关键词： Lyapunov functions

European standardization efforts from FAIR toward explainable-AI-ready data documentation in materials modelling

学校读者我要写书评

暂无评论

European standardization efforts from FAIR toward explainabl...

Applied Artificial Intelligence (ICAPAI), International Conference on

作者： Martin Thomas Horsch Björn Schembera Heinz A. Preisig Department of Data Science Material Theory and Informatics Norwegian University of Life Sciences Ås Norway Institute of Applied Analysis and Numerical Simulation University of Stuttgart Stuttgart Germany Department of Chemical Engineering Norwegian University of Science and Technology Trondheim Norway

Security critical AI applications require a standardized and interoperable data and metadata documentation that makes the source data explainable-AI ready (XAIR). Within the domain of materials modelling and characterization, European initiatives have proposed a series of metadata standards and procedural recommendations that were accepted as CEN workshop agreements (CWAs): CWA 17284 MODA, CWA 17815 CHADA, and CWA 17960 ModGra. It is discussed how these standards have been ontologized, and gaps are identified as regards the epistemic grounding metadata, i.e., an annotation of data and claims by something that substantiates whether, why, and to what extent they are indeed knowledge and can be relied upon.

关键词：

Storage and redistribution of anthropogenic CO_(2) in the western North Pacific:The role of subtropical mode water transportation

学校读者我要写书评

暂无评论

Fundamental Research 2024年第1期4卷 103-112页

作者： Cheng-long Li Lei Han Wei-dong Zhai Di Qi Xu-chen Wang Hong-mei Lin Li-wen Zheng Institute of Marine Science and Technology Shandong UniversityQingdao 266237China China-ASEAN College of Marine Science and Technology Xiamen University MalaysiaSelangorMalaysia Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Polar and Marine Research Institute Jimei UniversityXiamen 361021China Key Laboratory of Marine Chemistry Theory and Technology and Frontiers Science Center for Deep Ocean Multispheres and Earth SystemMinistry of EducationOcean University of ChinaQingdao 266100China Center for Isotope Geochemistry and Geochronology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Weihai Institute of Marine Ecology and Economy Research Weihai 264400China

Oceanic uptake and storage of anthropogenic CO_(2)(CANT)are regulated by ocean circulation and *** decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develops,we investigated the water column carbonate system,dissolved inorganic radiocarbon and ancillary parameters in May and August 2018,spanning the Kuroshio Extension(KE,35-39°N),Kuroshio Recirculation(KR,27-35°N)and subtropical(21-27°N)*** column CANT inventories were estimated to be 40.5±1.1 mol m^(-2) in the KR zone and 37.2±0.9 mol m^(-2) in the subtropical *** comparison with historical data obtained in 2005,relatively high rates of increase of the CANT inventory of 1.05±0.20 and 1.03±0.12 mol m^(-2) yr^(-1) in the recent decade were obtained in the KR and subtropical zones,*** water-mass-based analyses suggest that formation and transport of subtropical mode water dominate the deep penetration,storage,and redistribution of CANT in those two *** the KE zone,however,both the water column CANT inventory and the decadal CANT accumulation rate were small and uncertain owing to the dynamic hydrology,where the naturally uplifting isopycnal surfaces make CANT penetration relatively *** findings of this study improve the understanding of the spatiotemporal variations of CANT distribution,storage,and transport in the western North Pacific.

关键词： Oceanic CO_(2)uptake Anthropogenic CO_(2)storage Subtropical mode water Kuroshio extension Kuroshio recirculation Western North Pacific

Significant impacts of artificial regulation on nutrient concentrations and transport in Huanghe River

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第6期42卷 1865-1879页

作者： Fuxia YANG Zhigang YU Alexander Felix BOUWMAN Hongtao CHEN Mengfan WU Jing LIU Dandan LI Qingzhen YAO Yao GONG Xinyu LI Wenyan GU Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao 266071China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China Department of Earth Sciences Faculty of GeosciencesUtrecht UniversityUtrecht 3584 CBThe Netherlands PBL Netherlands Environmental Assessment Agency Hague 30314The Netherlands Tianjin Marine Environmental Monitoring Central Station State Oceanic AdministrationTianjin 300457China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China

Human perturbations such as dam regulation have led to significant changes in nutrient flux,structure,and spatiotemporal distribution through rivers and have greatly influenced coastal and estuarine ecological *** on the data from 2001-2019,the impacts of the water-sediment regulation scheme(WSRS)in the Huanghe(Yellow)River on nutrient concentrations,forms,fluxes,and potential ecological effects on the Huanghe River estuary and Bohai Sea were *** concentrations and forms were significantly influenced by the different regulatory modes and were associated with hydrological and biogeochemical *** concentrations and forms of nutrients were strongly influenced by the riparian floodplains and scouring process of the downstream riverbed at the water draining stage,while they were influenced mainly by the mixing process in the Xiaolangdi Reservoir at the sediment desilting *** with those in non-WSRS years,the seasonal distributions of water discharge and nutrient fluxes in WSRS years significantly changed,with peaks occurring at least one month earlier than those in non-WSRS ***(NO_(3)-N),phosphate(PO_4-P),and silicate(SiO_(3)-Si)fluxes during the WSRS,which were strongly controlled by water discharge at Lijin(the nearest hydrological station to the river mouth),accounted for more than 20%of the annual fluxes;these fluxes were more than 5-9 times greater than those during the same period in non-WSRS *** exacerbated nutrient imbalances and increased Pyrrophyta/Bacillariophyta ratios by 231%in the Huanghe River estuary,resulting in chlorophyll-a peaks in the Bohai Sea shifting from spring to autumn in the 20~(th)century to spring-summer in the 21^(st)century.

关键词： water-sediment regulation scheme nutrient form nutrient flux ecological effect Huanghe(Yellow)River