135 research outputs found
Aircraft Marshaling Signals Dataset of FMCW Radar and Event-Based Camera for Sensor Fusion
No full textDataset Introduction
The advent of neural networks capable of learning salient features from variance in the radar data has expanded the breadth of radar applications, often as an alternative sensor or a complementary modality to camera vision. Gesture recognition for command control is the most commonly explored application. Nevertheless, more suitable benchmarking datasets are needed to assess and compare the merits of the different proposed solutions. Furthermore, most current publicly available radar datasets used in gesture recognition provide little diversity, do not provide access to raw ADC data, and are not significantly challenging. To address these shortcomings, we created and made available a new dataset that combines two synchronized modalities: radar and dynamic vision camera of 10 aircraft marshalling signals at several distances and angles, recorded from 13 people. Moreover, we propose a sparse encoding of the time domain (ADC) signals that achieve a dramatic data rate reduction (>76%) while retaining the efficacy of the downstream FFT processing (<2% accuracy loss on recognition tasks). Finally, we demonstrate early sensor fusion results based on compressed radar data encoding in range-Doppler maps with dynamic vision data. This approach achieves higher accuracy than either modality alone.
Dataset Structure
The dataset has a common directory structure which contains additional information about the captures.
dataset_dir///--/ofxRadar8Ghz_yyyy-mm-dd_HH-MM-SS.rad
Identifiers
stage [train, test].
room: [conference_room, foyer, open_space].
person: [0-9]. Note that 0 stands for no person, and 1 for an unlabeled, random person (only present in test).
gesture: ['none', 'emergency_stop', 'move_ahead', 'move_back_v1', 'move_back_v2', 'slow_down' 'start_engines', 'stop_engines', 'straight_ahead', 'turn_left', 'turn_right'].
distance: ['xxx', '100', '150', '200', '250', '300', '350', '400', '450'] (in cm). Note that xxx is used for none gestures when there is no person present in front of the radar (i.e. background samples), or when a person is walking infront of the radar with varying distances but performing no gesture.If you use this dataset, please also cite our accompanying paper:
@inproceedings{mueller2023aircraft, title={Aircraft Marshalling Signals Dataset of Radar and Event-Based Camera for Sensor Fusion}, author={M\"uller, Leon and Sifalakis, Manolis and Eissa, Sherif and Yousefzadeh, Amirreza and Detterer, Paul and Stuijk, Sander, and Corradi, Federico}, journal={IEEE Radar Conference, San Antonio, TX}, volume={}, number={1}, pages={1--15}, year={2023}, publisher={IEE}
Loose ends: almost one in five human genes still have unresolved coding status
No full textThe authors have accidently omitted one co-author. Part of the work described in this study was performed in the laboratory of Dr Manolis Kellis, Computer Science and Electrical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA, USA and The Broad Institute of MIT and Harvard, Cambridge, MA, USA.
Dr Kellis’ name has been added to the authorship and the published article has been updated
Dramaturgias Sonoras:: repolitizando a performance
No full textO artigo explora o potencial do som para repolitizar o teatro e a performance. Ao examinar a atividade e as práticas dramatúrgicas do coletivo de arte multimídia Medea Electronique (Grécia), destaca as contradições da arte contemporânea, particularmente a transição continuada do ‘tudo é político’ para ‘não, nem tudo é político’ e vice-versa. Do ponto de vista pós-brechtiano, a função política da arte reside em preservar as variadas sensibilidades no cerne da autonomia da arte. Isso implica evitar que a arte seja reduzida a um gesto pós-político ou que esteja demasiadamente alinhada com as experiências estetizadas cotidianas
Sound Dramaturgies:: repoliticizing performance
No full textThe paper explores the potential of sound to repoliticize theatre and performance. By examining the activity and dramaturgical practices of the multimedia art collective Medea Electronique (Greece), it highlights contradictions of contemporary art, particularly the continuous transition from ‘everything is political’ to ‘no, not everything is political’ and vice versa. From a post-Brechtian perspective, the political function of art lies in preserving the diverse sensibilities at the core of art’s autonomy. This entails avoiding that art be reduced to a post-political gesture or aligning it too closely with everyday aestheticized experiences.L’article explore le potentiel du son pour « repolitiser » le théâtre et la performance, à travers l’art de la dramaturgie. En examinant l’activité et les pratiques dramaturgiques du collectif d’art multimédia Medea Electronique (Grèce), il met en lumière les contradictions de l’art contemporain, autrement dit le passage continu du ‘tout est politique’ au ‘non, l'intégralité des sujets ne revêt pas une dimension politique’ et vice versa. Dans une perspective post-brechtienne, la fonction politique de l’art réside dans la préservation des diverses sensibilités qui constituent le noyau de l’autonomie de l’art. Cela implique d’éviter que l’art soit réduit à un geste post-politique ou qu’il s’aligne trop étroitement sur les expériences esthétisées quotidiennes
Sound Dramaturgies:: repoliticizing performance
No full textThe paper explores the potential of sound to repoliticize theatre and performance. By examining the activity and dramaturgical practices of the multimedia art collective Medea Electronique (Greece), it highlights contradictions of contemporary art, particularly the continuous transition from ‘everything is political’ to ‘no, not everything is political’ and vice versa. From a post-Brechtian perspective, the political function of art lies in preserving the diverse sensibilities at the core of art’s autonomy. This entails avoiding that art be reduced to a post-political gesture or aligning it too closely with everyday aestheticized experiences.L’article explore le potentiel du son pour « repolitiser » le théâtre et la performance, à travers l’art de la dramaturgie. En examinant l’activité et les pratiques dramaturgiques du collectif d’art multimédia Medea Electronique (Grèce), il met en lumière les contradictions de l’art contemporain, autrement dit le passage continu du ‘tout est politique’ au ‘non, l'intégralité des sujets ne revêt pas une dimension politique’ et vice versa. Dans une perspective post-brechtienne, la fonction politique de l’art réside dans la préservation des diverses sensibilités qui constituent le noyau de l’autonomie de l’art. Cela implique d’éviter que l’art soit réduit à un geste post-politique ou qu’il s’aligne trop étroitement sur les expériences esthétisées quotidiennes
Dramaturgias Sonoras:: repolitizando a performance
No full textO artigo explora o potencial do som para repolitizar o teatro e a performance. Ao examinar a atividade e as práticas dramatúrgicas do coletivo de arte multimídia Medea Electronique (Grécia), destaca as contradições da arte contemporânea, particularmente a transição continuada do ‘tudo é político’ para ‘não, nem tudo é político’ e vice-versa. Do ponto de vista pós-brechtiano, a função política da arte reside em preservar as variadas sensibilidades no cerne da autonomia da arte. Isso implica evitar que a arte seja reduzida a um gesto pós-político ou que esteja demasiadamente alinhada com as experiências estetizadas cotidianas
Cognitive abstraction approach to sketch-based image retrieval
No full textThesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaves 151-157).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.As digital media become more popular, corporations and individuals gather an increasingly large number of digital images. As a collection grows to more than a few hundred images, the need for search becomes crucial. This thesis is addressing the problem of retrieving from a small database a particular image previously seen by the user. This thesis combines current findings in cognitive science with the knowledge of previous image retrieval systems to present a novel approach to content based image retrieval and indexing. We focus on algorithms which abstract away information from images in the same terms that a viewer abstracts information from an image. The focus in Imagina is on the matching of regions, instead of the matching of global measures. Multiple representations, focusing on shape and color, are used for every region. The matches of individual regions are combined using a saliency metric that accounts for differences in the distributions of metrics. Region matching along with configuration determines the overall match between a query and an image.by Manolis Kamvysselis and Ovidiu Marina.S.B.and M.Eng
Inverse identification of buffeting and self-excited wind loads on the hardanger bridge from acceleration data
No full textThe traditional wind load assessment for long-span bridges rely on assumed models for the wind field and aerodynamic coefficients from wind tunnel tests, which usually introduces some uncertainties. It is therefore desired to develop tools that can utilize full-scale vibration response data from existing bridges in order to study the wind loading in detail for in-situ conditions. This paper presents a novel case study of inverse identification of dynamic wind loads on the 1310 m long Hardanger bridge, a suspension bridge equipped with a network of accelerometers. The identification method used is an extented Kalman-type filter for joint input, state, and parameter estimation. A system model considering the still-air modes in addition to a quasi-steady submodel for the self-excited forces of the bridge is presente. The coefficients for self-excited lift and pitching moment are considered unknown and are jointly estimated with the buffeting forces.Dynamics of StructuresOffshore Engineerin
Fluid structure interaction modelling on flapping wings
No full textFlapping wings display complex flows which can be used to generate large lift forces. Flexibility in wings is widely used by natural flyers to increase the aerodynamic performance. The influence of wing flexibility on the flow can be computed using numerical analysis with Fluid Structure Interaction (FSI). The influence of inertial, elastic and aerodynamic forces is quantified using a 2D wing. A sinusoidal flapping motion is imposed on the leading edge of the vertical wing. The inertial force on the wing dominates for high mass ratios and the wing deflection is rather independent of the flow. For a low mass ratio, the wing deformation scales with the increasing elasticity. The maximum lift and lowest drag were found for the wing with large flexibility and low mass so the passive deformation by aerodynamic forces creates a favourable shape for lift production. Flexible translating and revolving wings at an angle of attack of 45 degrees show that chordwise flexibility decreases both lift and drag, however the lift over drag ratio is increased. The flow around both wings forms a coherent structure with a Root Vortex (RV), Tip Vortex (TV), Leading Edge Vortex (LEV) and Trailing Edge Vortex (TEV). The LEV on the revolving wing is stable for approximately up to half the span because vorticity is transported outward in the vortex core. The flowfield and LEV breakdown are consistent with experimental data of the same wing. The translating wing builds up circulation but the LEV detaches quickly near the centre of the wing. Chordwise bending reduces the angle of attack which decreases the distance to the core of the shed LEVs.Aerodynamic
New records of the rare deep-water alga Sebdenia monnardiana (Rhodophyta) and the alien Dictyota cyanoloma (Phaeophyceae) and the unresolved case of deep-water kelp in the Ionian and Aegean Seas (Greece)
No full textWe would like to thank the entire crew of R/V Philia (HCMR), led by Cptn. Manolis Kokos, for their smooth conductance of both cruises and great hospitality on board. Thanks are also due to Max Overstrom-Coleman (Moss Landing) for supporting the Ionian Sea cruise in March 2013, to Conxi Rodriguez-Prieto (Girona) for identifying Sebdenia monnardiana, and to Dawn Shewring (Aberdeen) for supporting the molecular work. We also acknowledge many years of funding support from the TOTAL Foundation (Paris) to FCK, PP, KT and CK, and from the UK Natural Environment Research Council to FCK (grant NE/D521522/1, Oceans 2025 / WP 4.5). AM received joint PhD funding from the School of Biological Sciences, University of Aberdeen, and the Falkland Islands Government. We are also grateful for funding from the MASTS pooling initiative (The Marine Alliance for Science and Technology for Scotland). MASTS is funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions.Peer reviewe
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