Journal articles: 'Capteur position'

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Boileau, Thierry, Serge Pierfederici, Babak Nahid-Mobarakeh, Farid Meibody-Tabar, and Guillaume Lejeune. "Défaut du capteur de position d´un actionneur." Revue internationale de génie électrique 10, no. 3-4 (June 30, 2007): 475–500. http://dx.doi.org/10.3166/rige.10.475-500.

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Dieulesaint, E., A. Billmann, D. Royer, and R. Alkama. "Capteur de position à ondes élastiques guidées dans un fil magnétostrictif." Revue de Physique Appliquée 20, no. 6 (1985): 391–94. http://dx.doi.org/10.1051/rphysap:01985002006039100.

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-Legrand, B. "Capteur de position sans contact fonctionnant par saturation de tôles hautement perméables." Revue de l'Electricité et de l'Electronique -, no. 02 (2002): 30. http://dx.doi.org/10.3845/ree.2002.016.

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Vigneau, Nathalie, Corentin Chéron, Aleixandre Verger, and Frédéric Baret. "Imagerie aérienne par drone : exploitation des données pour l'agriculture de précision." Revue Française de Photogrammétrie et de Télédétection, no. 213 (April 26, 2017): 125–31. http://dx.doi.org/10.52638/rfpt.2017.203.

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La technologie des drones devenant plus accessible et les réglementations nationales encadrant les vols des drones commençant à émerger, de nombreuses sociétés utilisent désormais des drones pour réaliser des acquisitions d'images.Parmi celles-ci AIRINOV a choisi de se spécialiser dans l'agriculture et offre ses services aux agriculteurs ainsi qu'aux expérimentateurs. AIRINOV exploite les drones eBee de senseFly. Le drone a une envergure d'1 m pour un poids de 700 g charge comprise et son vol est entièrment automatique. Le vol est programmé à l'avance puis contrôlé par unauto-pilote connecté à un capteur GPS et à une centrale inertielle embarqués. Ces capteurs enregistrent la position et l'attitude du drone pendant son vol, permettant de géolocaliser les images acquises. Une étude réalisée avec des cibles au sol a permis d'établir que le positionnement absolu des images est de 2,06 m. Toutefois, le recalage sur des points dont on connaît les coordonnées permet d'avoir un géoréférencement avec une précision centimétrique.En parallèle de l'utilisation des appareils photos classiques (RGB), AIRINOV utilise un capteur multispectral quadribande.Les longueurs d'onde de ce capteur sont modulables mais sont généralement vert, rouge, red edge et proche infra-rouge.Ces longueurs d'onde permettent non seulement le suivi d'indices de végétation tels que le NDVI mais également l'accès à des variables biochimiques et biophysiques par inversion d'un modèle de transfert radiatif. Une étude menée conjointement avec l'INRA d'Avignon et le CREAF permet d'accéder au Green Area Index (GAI) et au contenu en chlorophylle (Cab) sur colza, blé, maïs et orge. Cet article présente les résultats d'estimation du GAI avec une RMSE de 0,25 et de Cab avec une RMSE de 4,75 microgrammes/cm2.La qualité des estimations combinée à la forte capacité de revisite du drone ainsi qu'à la multiplicité des indicateurs disponibles démontre le grand intérêt du drone pour le phénotypage et le suivi de plateformes d'essais.

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Méric, S., F. Nouvel, R. Agarini, T. Bunouf, Q. Guellaen, G. Le Bouhart, M. Meilhat, et al. "Système de surveillance de la qualité de l’air basé sur des capteurs embarqués sur vélo : projet AIR’O X AIR BREIZH." J3eA 21 (2022): 1026. http://dx.doi.org/10.1051/j3ea/20221026.

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Cette communication décrit la réalisation d’un projet étudiant (projet Air’o) destiné au suivi de la pollution de l’air en collaboration avec l’association Air Breizh. Ce projet a été initié pendant l’année universitaire 2019-2020 lors de la 2ème année ingénieur (niveau M1) au sein du département « électronique et télécommunications » de l’INSA de Rennes. Le but du projet est de proposer une mesure de la qualité de l’air par l’intermédiaire de capteurs embarqués sur des vélos. Une transmission de la position du capteur ainsi que la mesure de pollution en temps réel via le réseau LoRaWAN (Long Range Wide-area Network) permet de localiser les niveaux de pollution tout au long du parcours du vélo. Ce suivi de la qualité de l’air s’effectue par la récupération des données (pollution, position) sur un serveur dédié. Une application spécifique est développée afin de situer géographiquement les niveaux de pollution enregistrés. La réalisation d’un prototype est présentée ainsi que la transmission des informations. Des premiers résultats indiquent la pertinence du concept développé.

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Bonvin, Frédéric, and Yves Perriard. "Détection sans capteur de la position de moteurs synchrones autocommutés - Mise en uvre pour applications à faible coût." Revue internationale de génie électrique 5, no. 1 (March 30, 2002): 23–33. http://dx.doi.org/10.3166/rige.5.23-33.

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Jauréguiberry, Francis. "L’individu hypermoderne face aux big data." Sociologie et sociétés 49, no. 2 (December 4, 2018): 33–58. http://dx.doi.org/10.7202/1054273ar.

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Les big data, le datamining et le profilage, avec l’ensemble des applications d’aide à l’action individuelle et collective qui en découle, suscitent à juste titre des inquiétudes en ce qui concerne, d’une part la protection de la vie privée dans un environnement capteur des faits et gestes de chacun, d’autre part les formes de gouvernance de plus en plus informées par des algorithmes prédictifs. Sans négliger ces dangers, une position presque inverse sera ici défendue sous forme d’hypothèse : loin d’entraîner le déclin de l’autonomie individuelle, de soi comme personne singulière capable de réflexivité et en position de faire des choix autonomes, la confrontation renouvelée à une image personnelle purement quantitative et utilitaire (profil) peut conduire à un ressaisissement de soi visant à ce que les choix soient non plus seulement guidés par une logique narcissique, utilitaire et quantitative, mais tout autant par des principes de cohérence individuelle, éthiques et moraux qui, in fine, donnent du sens à la vie.

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TOUDERT, OUIZA, FRANÇIS AUGER, AZEDDINE HOUARI, and MOURAD LAGHROUCHE. "NOUVELLE EXTRACTION DE POSITION DU ROTOR BASÉE SUR L'INJECTION DE TENSION À HAUTE FRÉQUENCE TOURNANTE POUR LES ENTRAÎNEMENTS DE MACHINES SYNCHRONES À AIMANTS PERMANENTS À VITESSE BASSE OU NULLE." REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE 68, no. 2 (July 3, 2023): 188–93. http://dx.doi.org/10.59277/rrst-ee.2023.68.2.12.

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Une nouvelle procédure pour l'extraction de la position du rotor des moteurs synchrones à aimants permanents à pôles saillants (PMSM) est présentée dans cet article. Un signal de rotation de porteur est injecté dans la machine pour mesurer son déplacement à l'aide d'un courant haute fréquence. Cette méthode réduit le temps de calcul, simplifie le modèle d'extraction et améliore l'erreur d'évaluation du déplacement. Cette méthode est efficace pour les moteurs synchrones à aimants permanents montés en surface (SPMSM) présentant de petites saillances magnétiques avec un enroulement de stator distribué de manière sinusoïdale alimenté par un onduleur de source de tension à modulation d'impulsions vectorielles spatiales (SVPWM). Les résultats expérimentaux ont prouvé que la méthode de compensation de déphasage en ligne pouvait évaluer le déplacement du rotor, la vitesse et le fonctionnement du contrôle vectoriel PMSM sans capteur avec une grande précision. Cette méthode a montré son efficacité pour les performances statiques et dynamiques dans diverses conditions de charge de fonctionnement.

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Watanabe, Katsumi, Takashi R. Sato, and Shinsuke Shimojo. "Perceived Shifts of Flashed Stimuli by Visible and Invisible Object Motion." Perception 32, no. 5 (May 2003): 545–59. http://dx.doi.org/10.1068/p5047.

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Perceived positions of flashed stimuli can be altered by motion signals in the visual field—position capture (Whitney and Cavanagh, 2000 Nature Neuroscience3 954–959). We examined whether position capture of flashed stimuli depends on the spatial relationship between moving and flashed stimuli, and whether the phenomenal permanence of a moving object behind an occluding surface (tunnel effect; Michotte 1950 Acta Psychologica7 293–322) can produce position capture. Observers saw two objects (circles) moving vertically in opposite directions, one in each visual hemifield. Two horizontal bars were simultaneously flashed at horizontally collinear positions with the fixation point at various timings. When the movement of the object was fully visible, the flashed bar appeared shifted in the motion direction of the circle. But this position-capture effect occurred only when the bar was presented ahead of or on the moving circle. Even when the motion trajectory was covered by an opaque surface and the bar was flashed after complete occlusion of the circle, the position-capture effect was still observed, though the positional asymmetry was less clear. These results show that movements of both visible and ‘hidden’ objects can modulate the perception of positions of flashed stimuli and suggest that a high-level representation of ‘objects in motion’ plays an important role in the position-capture effect.

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Maddonni, Gustavo Ángel, and Joaquín Martínez-Bercovich. "Row Spacing, Landscape Position, and Maize Grain Yield." International Journal of Agronomy 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/195012.

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The use of narrow row spacing for the different landscape positions of a field could punish maize (Zea maysL.) grain yield. Two experiments were conducted (2006/07 and 2007/08) at different landscape positions in the Inland Pampas of Argentina. Hybrid DK190MG was grown at the commonest plant density used at each landscape position (approximately 5.1 plants/m2at the summit, 6.5 plants/m2at shoulder-slope position, and 7.6 plants/m2at foot-slope position) with three row spacings (0.38 m, 0.52 m, and 0.38 m in a2×1skip-row pattern). At the silking stage of maize crops, soil water content (0–200 cm depth) and maximum light capture differed (0.05<P<0.001) among landscape positions but were similar among row spacings. Differences in grain yield among landscape positions (mean 806, 893, and 1104 g/m2at the summit, shoulder-slope position, and foot-slope position, resp.) were related to kernel number/m2(r=0.94), which was closely related (r=0.90) to light capture around silking. Grain yield reductions (6 to 20%) were recorded when crops were cultivated in rows 0.38 m apart. The skip-row pattern did not improve grain yield. Maize grain yield was optimized in rows 0.52 m apart along the sandy landscape positions of the fields.

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11

Vatterott, D., and S. Vecera. "Hand position modulates attentional capture." Journal of Vision 13, no. 9 (July 25, 2013): 78. http://dx.doi.org/10.1167/13.9.78.

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Ritz, D. A., and E. B. Metillo. "Costs and Benefits of Swarming Behaviour in Mysids: Does Orientation and Position in the Swarm Matter?" Journal of the Marine Biological Association of the United Kingdom 78, no. 3 (August 1998): 1011–14. http://dx.doi.org/10.1017/s0025315400044957.

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Mysids (Paramesopodopsis rufa) were tethered in both swarm and school formations in a flow tank to test whether food capture was influenced by orientation or position in the aggregation. Neither orientation nor position exerted a significant influence on food capture success. However, the two formations differed in that certain positions in the polarized configuration were significantly correlated. In addition individuals at the front of the aggregation captured more food (though non-significantly) with a significantly higher degree of variation. This experiment has demonstrated the feasibility of measuring food capture success in different locations within an aggregation of crustaceans.

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Schreiner, Paul, Maksym Perepichka, Hayden Lewis, Sune Darkner, Paul G. Kry, Kenny Erleben, and Victor B. Zordan. "Global Position Prediction for Interactive Motion Capture." Proceedings of the ACM on Computer Graphics and Interactive Techniques 4, no. 3 (September 22, 2021): 1–16. http://dx.doi.org/10.1145/3479985.

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We present a method for reconstructing the global position of motion capture where position sensing is poor or unavailable. Capture systems, such as IMU suits, can provide excellent pose and orientation data of a capture subject, but otherwise need post processing to estimate global position. We propose a solution that trains a neural network to predict, in real-time, the height and body displacement given a short window of pose and orientation data. Our training dataset contains pre-recorded data with global positions from many different capture subjects, performing a wide variety of activities in order to broadly train a network to estimate on like and unseen activities. We compare training on two network architectures, a universal network (u-net) and a traditional convolutional neural network (CNN) - observing better error properties for the u-net in our results. We also evaluate our method for different classes of motion. We observe high quality results for motion examples with good representation in specialized datasets, while general performance appears better in a more broadly sampled dataset when input motions are far from training examples.

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Blatt, Peter. "Laser enhanced positron capture." Hyperfine Interactions 44, no. 1-4 (March 1989): 295–304. http://dx.doi.org/10.1007/bf02398678.

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Marcoux, Beth C., Doreen Stiskal, Laura L. Swisher, and Sandra Wise. "CAPTE Response to Position Papers." Journal of Physical Therapy Education 32, no. 2 (June 2018): 128–29. http://dx.doi.org/10.1097/jte.0000000000000057.

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Li, Zhongwei, Xingshuai Cui, Leiquan Wang, Hao Zhang, Xue Zhu, and Yajing Zhang. "Spectral and Spatial Global Context Attention for Hyperspectral Image Classification." Remote Sensing 13, no. 4 (February 19, 2021): 771. http://dx.doi.org/10.3390/rs13040771.

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Recently, hyperspectral image (HSI) classification has attracted increasing attention in the remote sensing field. Plenty of CNN-based methods with diverse attention mechanisms (AMs) have been proposed for HSI classification due to AMs being able to improve the quality of feature representations. However, some of the previous AMs squeeze global spatial or channel information directly by pooling operations to yield feature descriptors, which inadequately utilize global contextual information. Besides, some AMs cannot exploit the interactions among channels or positions with the aid of nonlinear transformation well. In this article, a spectral-spatial network with channel and position global context (GC) attention (SSGCA) is proposed to capture discriminative spectral and spatial features. Firstly, a spectral-spatial network is designed to extract spectral and spatial features. Secondly, two novel GC attentions are proposed to optimize the spectral and spatial features respectively for feature enhancement. The channel GC attention is used to capture channel dependencies to emphasize informative features while the position GC attention focuses on position dependencies. Both GC attentions aggregate global contextual features of positions or channels adequately, following a nonlinear transformation. Experimental results on several public HSI datasets demonstrate that the spectral-spatial network with GC attentions outperforms other related methods.

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Seimiya, Yuji, Masao Kuriki, Tohru Takahashi, Tsunehiko Omori, Toshiyuki Okugi, Masanori Satoh, Jyunji Urakawa, and Shigeru Kashiwagi. "Positron capture simulation for the ILC electron-driven positron source." Progress of Theoretical and Experimental Physics 2015, no. 10 (October 2015): 103G01. http://dx.doi.org/10.1093/ptep/ptv136.

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Hugenschmidt, C., G. Kögel, R. Repper, K. Schreckenbach, P. Sperr, and W. Triftshäuser. "Positron source based on neutron capture." Radiation Physics and Chemistry 68, no. 3-4 (October 2003): 669–71. http://dx.doi.org/10.1016/s0969-806x(03)00197-x.

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Selim, F. A., D. P. Wells, and J. F. Harmon. "Positron lifetime measurements by proton capture." Review of Scientific Instruments 76, no. 3 (March 2005): 033905. http://dx.doi.org/10.1063/1.1863772.

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Kim, Wooh Yun, Ji Wook Kwon, and Ji Won Seo. "Formation Control of Quadrotor UAVs by Vision-Based Positioning." Applied Mechanics and Materials 798 (October 2015): 282–86. http://dx.doi.org/10.4028/www.scientific.net/amm.798.282.

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In this paper, a formation control method of quadrotor Unmanned Aerial Vehicles (UAVs) by vision-based positioning is presented. The relative positions and attitudes of two UAVs with respect to a visual marker attached to the third UAV is estimated by a camera calibration method. Based on the estimated positions and attitudes, two UAVs are controlled to the desired positions to form a given formation with respect to the third UAV. A simplified dynamics model of a quadrotor UAV is utilized to design a controller. The proposed formation control method is validated by an experiment with a motion capture system which provides the ground truth of the position data.

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Klein, Barrie, Chris Paffen, Susan te Pas, and Serge Dumoulin. "Attention field models capture biases in perceived position." Journal of Vision 16, no. 12 (September 1, 2016): 1273. http://dx.doi.org/10.1167/16.12.1273.

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Watanabe, K., R. Nijhawan, and S. Shimojo. "Position capture by object motion through a slit." Journal of Vision 1, no. 3 (March 14, 2010): 15. http://dx.doi.org/10.1167/1.3.15.

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Gou, Rui Bin, and Yi Liang Zhang. "Analysis on Test Method of Metal Magnetic Memory Mechanism of Ferromagnetic Materials Based Plastic Deformation." Advanced Materials Research 476-478 (February 2012): 2577–81. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.2577.

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A new test method of metal magnetic memory (MMM) was designed and was applied to study the relationship between MMM signals distortion and uneven plastic deformation so as to obtain the direct evidence of the result that MMM signals change unevenly causing by the unevenly plastic deformation in tensile test. Macro magnetic memory measurement were done to capture the occurrence time and position of MMM signals’ distortion during the period of plastic deformation, strain measurement were done before each MMM measurement and micro slip lines were observed after each time when MMM signals were measured to capture the occurrence time and position of plastic deformation. Then direct evidence can be obtained by compared the consistency of the time and positions. Preliminary tests were done to prove the rationality and feasibility of the new test method. The results show that the evidence can be obtained effectively and change law of MMM signals were reproduced by this new test method.

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McKenna, Victoria S., Rachel M. Roberts, Aaron D. Friedman, Savannah N. Shanley, and Andres F. Llico. "Impact of naturalistic smartphone positioning on acoustic measures of voice." Journal of the Acoustical Society of America 154, no. 1 (July 1, 2023): 323–33. http://dx.doi.org/10.1121/10.0020176.

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Smartphone technology has been used for at-home health monitoring, but there are few available applications (apps) for tracking acoustic measures of voice for those with chronic voice problems. Current apps limit the user by restricting the range of smartphone positions to those that are unnatural and non-interactive. Therefore, we aimed to understand how more natural smartphone positions impacted the accuracy of acoustic measures in comparison to clinically acquired and derived measures. Fifty-six adults (11 vocally healthy, 45 voice disordered, aged 18–80 years) completed voice recordings while holding their smartphones in four different positions (e.g., as if reading from the phone, up to the ear, etc.) while a head-mounted high-quality microphone attached to a handheld acoustic recorder simultaneously captured voice recordings. Comparisons revealed that mean fundamental frequency (Hz), maximum phonation time (s), and cepstral peak prominence (CPP; dB) were not impacted by phone position; however, CPP was significantly lower on smartphone recordings than handheld recordings. Spectral measures (low-to-high spectral ratio, harmonics-to-noise ratio) were impacted by the phone position and the recording device. These results indicate that more natural phone positions can be used to capture specific voice measures, but not all are directly comparable to clinically derived values.

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Cai, Z. J., and Li Jiang Zeng. "A Fast Search Coil Sensing Method for Tracking Systems." Key Engineering Materials 295-296 (October 2005): 601–6. http://dx.doi.org/10.4028/www.scientific.net/kem.295-296.601.

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It is important to track a free flying insect to investigate its flight performance. Conventional video tracking systems are difficult to track a highly maneuverable insect, because the capture frequency of the camera is limited and it can hardly get the position of the insect in real time. We proposed a fast sensing method for insect tracking based on magnetic search coil sensors. It can simultaneously determine the orientation and position of the sensors. We constructed a system, calibrated the magnetic device. We developed a set of calculating methods and measured several positions and angles of coil sensors. The results show that it can rapidly provide the tracking feedback information to meet the requirement for insect tracking.

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Raghunandan, Avesh, and Jason Andrus. "Binocular capture: The role of non-linear position mechanisms." Vision Research 102 (September 2014): 11–18. http://dx.doi.org/10.1016/j.visres.2014.06.007.

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Yongqiong Zhu, Yongqiong Zhu, Fan Zhang Yongqiong Zhu, and Zhidong Xiao Fan Zhang. "Attention-Based Recurrent Autoencoder for Motion Capture Denoising." 網際網路技術學刊 23, no. 6 (November 2022): 1325–33. http://dx.doi.org/10.53106/160792642022112306015.

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<p>To resolve the problem of massive loss of MoCap data from optical motion capture, we propose a novel network architecture based on attention mechanism and recurrent network. Its advantage is that the use of encoder-decoder enables automatic human motion manifold learning, capturing the hidden spatial-temporal relationships in motion sequences. In addition, by using the multi-head attention mechanism, it is possible to identify the most relevant corrupted frames with specific position information to recovery the missing markers, which can lead to more accurate motion reconstruction. Simulation experiments demonstrate that the network model we proposed can effectively handle the large-scale missing markers problem with better robustness, smaller errors and more natural recovered motion sequence compared to the reference method.</p> <p> </p>

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Kato, Ryohei, Katsumi Hirose, Takahiro Kato, Tomoaki Motoyanagi, Kazuhiro Arai, Takaomi Harada, Akihiko Takeuchi, et al. "Dosimetric effects of the ipsilateral shoulder position variations in the sitting-positioned boron neutron capture therapy for lower neck tumor." Applied Radiation and Isotopes 188 (October 2022): 110397. http://dx.doi.org/10.1016/j.apradiso.2022.110397.

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Amsler, S., J. Filledier, and R. Millogo. "Attractifs olfactifs pour la capture de Glossina tachinoides et Glossina morsitans submorsitans (Diptera : Glossinidae) au Bukina Faso." Revue d’élevage et de médecine vétérinaire des pays tropicaux 47, no. 3 (March 1, 1994): 301–11. http://dx.doi.org/10.19182/remvt.9093.

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Deux expériences sont menées en saison sèche au Burkina Faso sur le site expérimental de la Comoé (zone soudano-guinéenne), afin d'étudier l'influence de la position du sachet diffuseur de produits olfactifs pour Glossina tachinoides et Glossina morsitans submorsitans. Cet essai compare les positions interne et externe du méta-crésol et de l'association méta-crésol/octénol (proportions 3/1) dans des pièges biconiques. La position du sachet n'apparaît pas comme un facteur fondamental d'efficacité des pièges et les résultats obtenus sont variables selon la saison et l'espèce de glossine considérée. Des différences selon le sexe sont également notées. Le rôle de la distance n'a pas été étudié.

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Barnamehei, Hamidreza, Gunarajulu Renganathan, Fatemeh Aflatounian, Samirasadat Fatemigarakani, Ava Maboudmanesh, Aidasadat Fatahzadeh, Aram Shaabani, and Yuichi Kurita. "Effect of Medial-Lateral, Inferior-Superior, and Rotational Positions of Palms on Muscle Recruitment during the Push-Up Exercise." Applied Sciences 12, no. 19 (October 10, 2022): 10178. http://dx.doi.org/10.3390/app121910178.

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The goal of the present article is to compare neuromuscular activation patterns among medial-lateral, superior-inferior, and rotational positions of palms for 14 selective muscles during the push-up exercise. Muscle activity and kinematics information of fifteen males (68.35 ± 7.18 kg, 175 ± 3.40 cm, 24.50 ± 7.50 years) were recorded by Myon Electromyographic (EMG) system and Vicon motion capture, respectively. EMG activity in the anterior deltoid, middle deltoid, posterior deltoid, infraspinatus, upper pectoralis major, middle pectoralis major, lower pectoralis major, latissimus dorsi, triceps lateral, triceps medial, biceps brachii, upper trapezius, middle trapezius, and lower trapezius was measured. According to the results, the narrow position of palms increased the infraspinatus, upper pectoralis major, triceps brachii (lateral and medial head), middle trapezius, and lower trapezius muscles, while the wide position of palms enhanced the lower pectoralis major muscle. Superior positions of palms enhanced the upper trapezius, while the inferior positions of palms increased the anterior deltoid, posterior deltoid, infraspinatus, biceps brachii, middle trapezius, lower trapezius, and pectoralis major (lower, middle, and upper) muscles. Internal positions of the palms increased all pectoralis major muscles (lower, middle, and upper), while external positions (lower, middle, and upper) enhanced the middle deltoid, latissimus dorsi, biceps brachii, middle trapezius, and lower trapezius muscles. The information about muscle activation during various types of push-ups can potentially help athletes, coaches, personal trainers, and clinicians to apply modified push-up exercises to make new systematic and useful exercise plans.

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Klein, Kyle, and Subhash Suri. "Complete Information Pursuit Evasion in Polygonal Environments." Proceedings of the AAAI Conference on Artificial Intelligence 25, no. 1 (August 4, 2011): 1120–25. http://dx.doi.org/10.1609/aaai.v25i1.7990.

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Suppose an unpredictable evader is free to move around in a polygonal environment of arbitrary complexity that is under full camera surveillance. How many pursuers, each with the same maximum speed as the evader, are necessary and sufficient to guarantee a successful capture of the evader? The pursuers always know the evader's current position through the camera network, but need to physically reach the evader to capture it. We allow the evader the knowledge of the current positions of all the pursuers as well---this accords with the standard worst-case analysis model, but also models a practical situation where the evader has ``hacked'' into the surveillance system. Our main result is to prove that three pursuers are always sufficient and sometimes necessary to capture the evader. The bound is independent of the number of vertices or holes in the polygonal environment.

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Cullen, Jeffrey L., and Gary D. Grossman. "Aggressive interactions affect foraging and use of space in a drift foraging salmonid, Salvelinus malma (Salmoniformes: Salmonidae)." Zoological Journal of the Linnean Society 187, no. 3 (August 13, 2019): 774–81. http://dx.doi.org/10.1093/zoolinnean/zlz050.

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Abstract Although intraspecific interactions likely affect habitat choice and foraging behaviour in animals, our knowledge regarding how these factors interact is frequently limited to either lab or field studies, but not both. We observed pairs of dominant and subordinate drift-foraging Dolly Varden char (Salvelinus malma) in an Alaskan stream, and quantified intraspecific interactions and foraging behaviour. Dominant individuals had higher foraging rates, occupied slower holding velocities and were displaced shorter distances during bouts compared to subordinate individuals. Individuals initiated bouts more frequently from the downstream position, than from lateral or upstream positions. Dominant individuals were more likely to occupy the upstream position after a bout than subordinates, which ensures that dominants have the first opportunity to capture drifting prey.

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Watanabe, Katsumi. "Asymmetric Mislocalization of a Visual Flash Ahead of and behind a Moving Object." Perception 34, no. 6 (June 2005): 687–98. http://dx.doi.org/10.1068/p5415.

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When subjects localize a flash relative to another stationary stimulus, the flash appears displaced in the direction of nearby motion signals (position capture; Whitney and Cavanagh, 2000 Nature Neuroscience3 954–959). Our previous study had suggested that the position capture is larger for a flash presented ahead of a moving stimulus than for a flash behind it (Watanabe et al, 2003 Perception32 545–559). In the present study, I investigated the spatial asymmetry of position capture. Experiment 1 demonstrated that asymmetric position capture occurs primarily in a moving-object-centered coordinate. Experiment 2 showed evidence that the asymmetric position capture operates after individuation of single visual objects. Finally, experiment 3 demonstrated that, when attention was reduced with a dual-task procedure, the asymmetric position capture increased. These results suggest that the spatial asymmetry of position capture occurs without attention but the spatial bias can be reduced by attention. Therefore, the underlying mechanism for the asymmetric spatial bias may be different from attentive tracking (Cavanagh, 1992 Science257 1563–1565) and mislocalization during smooth pursuit (Brenner et al, 2001 Vision Research41 2253–2259).

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Molet, Tom, Ronan Boulic, and Daniel Thalmann. "Human Motion Capture Driven by Orientation Measurements." Presence: Teleoperators and Virtual Environments 8, no. 2 (April 1999): 187–203. http://dx.doi.org/10.1162/105474699566161.

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Motion-capture techniques are rarely based on orientation measurements for two main reasons: (1) optical motion-capture systems are designed for tracking object position rather than their orientation (which can be deduced from several trackers), (2) known animation techniques, like inverse kinematics or geometric algorithms, require position targets constantly, but orientation inputs only occasionally. We propose a complete human motion-capture technique based essentially on orientation measurements. The position measurement is used only for recovering the global position of the performer. This method allows fast tracking of human gestures for interactive applications as well as high rate recording. Several motion-capture optimizations, including the multijoint technique, improve the posture realism. This work is well suited for magnetic-based systems that rely more on orientation registration (in our environment) than position measurements that necessitate difficult system calibration.

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Qian, Sen, Kunlong Bao, Bin Zi, and Ning Wang. "Kinematic Calibration of a Cable-Driven Parallel Robot for 3D Printing." Sensors 18, no. 9 (September 1, 2018): 2898. http://dx.doi.org/10.3390/s18092898.

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Three-dimensional (3D) printing technology has been greatly developed in the last decade and gradually applied in the construction, medical, and manufacturing industries. However, limited workspace and accuracy restrict the development of 3D printing technology. Due to the extension range and flexibility of cables, cable-driven parallel robots can be applied in challenging tasks that require motion with large reachable workspace and better flexibility. In this paper, a cable-driven parallel robot for 3D Printing is developed to obtain larger workspace rather than traditional 3D printing devices. A kinematic calibration method is proposed based on cable length residuals. On the basis of the kinematic model of the cable-driven parallel robot for 3D Printing, the mapping model is established among geometric structure errors, zero errors of the cable length, and end-effector position errors. In order to improve the efficiency of calibration measurement, an optimal scheme for measurement positions is proposed. The accuracy and efficiency of the kinematics calibration method are verified through numerical simulation. The calibration experiment based on the motion capture system indicates that the position error of end-effector is decreased to 0.6157 mm after calibration. In addition, the proposed calibration method is effective and verified for measurement positions outside optimal positions set through experiments.

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Zrenner, Markus, Arne Küderle, Nils Roth, Ulf Jensen, Burkhard Dümler, and Bjoern M. Eskofier. "Does the Position of Foot-Mounted IMU Sensors Influence the Accuracy of Spatio-Temporal Parameters in Endurance Running?" Sensors 20, no. 19 (October 7, 2020): 5705. http://dx.doi.org/10.3390/s20195705.

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Wearable sensor technology already has a great impact on the endurance running community. Smartwatches and heart rate monitors are heavily used to evaluate runners’ performance and monitor their training progress. Additionally, foot-mounted inertial measurement units (IMUs) have drawn the attention of sport scientists due to the possibility to monitor biomechanically relevant spatio-temporal parameters outside the lab in real-world environments. Researchers developed and investigated algorithms to extract various features using IMU data of different sensor positions on the foot. In this work, we evaluate whether the sensor position of IMUs mounted to running shoes has an impact on the accuracy of different spatio-temporal parameters. We compare both the raw data of the IMUs at different sensor positions as well as the accuracy of six endurance running-related parameters. We contribute a study with 29 subjects wearing running shoes equipped with four IMUs on both the left and the right shoes and a motion capture system as ground truth. The results show that the IMUs measure different raw data depending on their position on the foot and that the accuracy of the spatio-temporal parameters depends on the sensor position. We recommend to integrate IMU sensors in a cavity in the sole of a running shoe under the foot’s arch, because the raw data of this sensor position is best suitable for the reconstruction of the foot trajectory during a stride.

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Kurumadani, Hiroshi, Kazuya Kurauchi, Shota Date, Yosuke Ishii, and Toru Sunagawa. "Effect of the position of the interphalangeal joint on movements of the trapeziometacarpal joint during thumb opposition." Journal of Hand Surgery (European Volume) 47, no. 5 (January 8, 2022): 495–500. http://dx.doi.org/10.1177/17531934211065879.

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The Kapandji test is a simple method to score thumb opposition; however, the position of the interphalangeal joint of the thumb during this test has not been described. We aimed to quantitatively examine the effect of the thumb interphalangeal joint position on movements of the trapeziometacarpal joint during thumb opposition using the Kapandji test. The Kapandji test was carried out in 20 healthy participants during thumb interphalangeal joint extension and flexion. Movements of the joints and the activity of thenar muscles were recorded using motion capture and electromyography, respectively. We found that interphalangeal joint extension increased the trapeziometacarpal joint movement and thenar muscle activity compared with interphalangeal joint flexion, which contributed to thumb opposition at Kapandji Positions 0–6. These findings suggest the position of the thumb interphalangeal joint affects the trapeziometacarpal joint during thumb opposition, and assessment of thumb opposition using the Kapandji test is best done with the thumb interphalangeal joint in extension.

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Schoeberl, Tobias, Florian Goller, and Ulrich Ansorge. "The influence of display-to-display feature changes on net cueing effects: Evidence for a contribution of object-file updating." Quarterly Journal of Experimental Psychology 73, no. 6 (February 20, 2020): 908–19. http://dx.doi.org/10.1177/1747021820901938.

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In spatial cueing, presenting a peripheral cue at the same position as a to-be-searched-for target (valid condition) facilitates search relative to a cue presented away from the target (invalid condition). It is assumed that this cueing effect reflects spatial attentional capture to the cued position that facilitates search in valid relative to invalid conditions. However, the effect is typically stronger for top-down matching cues that resemble the targets than for non-matching cues that are different from targets. One factor which could contribute to this effect is that in valid non-matching conditions, a cue-to-target colour difference could prompt an object-updating cost of the target that counteracts facilitative influences of attention capture by the valid cues (this has been shown especially in known-singleton search). We tested this prediction by introducing colour changes at target locations in valid and invalid conditions in feature search. This should compensate for selective updating costs in valid conditions and unmask the true capture effect of non-matching cues. In addition, in top-down matching conditions, colour changes at target positions in invalid conditions should increase the cueing effect, now by selective updating costs in addition to capture away from the targets in invalid conditions. Both predictions were borne out by the results, supporting a contribution of object-file updating to net cueing effects. However, we found little evidence for attentional capture by non-matching cues in feature search even when the selective cost by object-file updating in only valid conditions was compensated for.

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Kövér, Á., K. Paludan, and G. Laricchia. "Electron-capture-to-the-continuum by positron impact." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 171, no. 1-2 (August 2000): 103–5. http://dx.doi.org/10.1016/s0168-583x(00)00163-4.

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Li, S. M., Z. J. Chen, Q. Q. Wang, and Z. F. Zhou. "Laser influence on positron-antiproton radiative capture collision." European Physical Journal D - Atomic, Molecular and Optical Physics 7, no. 1 (August 1, 1999): 39–44. http://dx.doi.org/10.1007/s100530050345.

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Wang, Sen, Shugui Liu, and Qing Mao. "A CMM-Based Method of Control Point Position Calibration for Light Pen Coordinate Measuring System." Sensors 20, no. 19 (September 29, 2020): 5592. http://dx.doi.org/10.3390/s20195592.

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A light pen coordinate measuring system (LPCMS) is a kind of vision-based portable coordinate measuring technique. It implements coordinate measurement by analyzing the image of a light pen, which has several control points and a probe. The relative positions of control points need to be determined before measurement and serve as the measuring basis in LPCMS. How to accurately calibrate the relative positions of control points is the most important issue in system calibration. In this paper, a new method of control point position calibration based on a traditional coordinate measuring machine (CMM) is proposed. A light pen is fastened to the measuring arm of a CMM and performs accurate translational movement driven by the CMM. A camera is used to capture the images of control points at different positions, and the corresponding readings of the CMM are recorded at the same time. By establishing a separate coordinate system for each control point, the relative positions of the control points can be transformed to the differences of a series of translation vectors. Experiments show that the calibration repeatability of control point positions can reach 10 μm and the standard deviation of measurement of the whole LPCMS can reach 30 μm. A CMM is used to generate accurate translation, which provides a high accuracy basis of calibration. Through certain mathematical treatment, tremendous data acquired by moving the light pen to tens of thousands of different positions can be processed in a simple way, which can reduce the influence of random error. Therefore, the proposed method provides a high-accuracy solution of control point position calibration for LPCMS.

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BUTTER, CHRISTIAN, GENG ZHANG, MARTIN SEIFERT, HANS-HEINRICH MINDEN, ANDREAS KÖNIG, and ECKART FLECK. "Effect of Atrial Lead Position on Atrial Automatic Capture Verification." Pacing and Clinical Electrophysiology 31, no. 9 (September 2008): 1118–24. http://dx.doi.org/10.1111/j.1540-8159.2008.01151.x.

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Gurnell, J., and J. Langbein. "Effects of trap position on the capture of woodland rodents." Journal of Zoology 200, no. 2 (August 20, 2009): 289–92. http://dx.doi.org/10.1111/j.1469-7998.1983.tb05791.x.

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Vatterott, D., and S. Vecera. "Does Hand Position Affect Attentional Capture by a Salient Distracter?" Journal of Vision 11, no. 11 (September 23, 2011): 87. http://dx.doi.org/10.1167/11.11.87.

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Hashi, Shuichiro, Masaharu Toyoda, Shin Yabukami, Masashi Ohya, Kazushi Ishiyama, Yasuo Okazaki, and Ken Ichi Arai. "Development of Magnetic Motion Capture System for Multi-Position Detection." Sensor Letters 5, no. 1 (March 1, 2007): 300–303. http://dx.doi.org/10.1166/sl.2007.008.

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Guensch, G. R., T. B. Hardy, and R. C. Addley. "Examining feeding strategies and position choice of drift-feeding salmonids using an individual-based, mechanistic foraging model." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 3 (March 1, 2001): 446–57. http://dx.doi.org/10.1139/f00-257.

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We demonstrated the ability of a mechanistic habitat selection model to predict habitat selection of brown trout (Salmo trutta) and mountain whitefish (Prosopium williamsoni) during summer and winter conditions in the Blacksmith Fork River, Utah. By subtracting energy costs and losses from the gross energy intake rate (GEI) obtained through simulation of prey capture, the model calculates the potential net energy intake rate (NEI) of a given stream position, which is essentially the rate of energy intake available for growth and reproduction. The prey capture model incorporates the size, swimming speed, and reaction distance of the fish; the velocity, depth, temperature, and turbidity of the water; and the density and size composition of the drifting invertebrates. The results suggest that during both summer and winter, the brown trout and mountain whitefish in our study reach avoided locations providing low NEI and preferred locations providing a high ratio of NEI to the swimming cost (SC) at the focal position of the fish (NEI/SC). This supports the idea that the drift-feeding fish in this study selected stream positions that provided adequate NEI for the least amount of swimming effort.

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Todt, Ingo, Dietmar Basta, Rainer Seidl, and Arne Ernst. "Advances to Electrode Pullback in Cochlear Implant Surgery." Scientific World Journal 2012 (2012): 1–4. http://dx.doi.org/10.1100/2012/126767.

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Objective. To observe the intracochlear behavior of a cochlear implant electrode insertion technique (called “pullback”) in temporal bones.Study Design. Experimental.Settings. Tertiary referral center.Method. The change of the intracochlear electrode position was investigated under various conditions of an electrode pullback (N=54) in 9 radiologically, size-estimated temporal bones (TBs). Those TBs were prepared by removal of the cochlear scalar roof to apply digital video capture procedures to monitor the pullback procedures. The digitally captured pictures were analyzed with specific software.Results. An optimal pullback of the electrode varied between 1.37 mm and 2.67 mm. While a limited pullback is without risk, an extended pullback bears the risk of removing the electrode tip out of its initial position or out of the cochlea. A correlation between cochlear size and the amount of pullback was not found.Conclusion. An initial insertion to the first or the second marker on the electrode followed by a limited pullback of about 1.37 mm to 1.5 mm can be recommended to achieve an optimized perimodiolar position. A pullback of up to two marker positions bears the risk of removing the electrode tip out of its initial position.

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Harmel, Robert, Alexander C. Tan, Kenneth Janda, and Jason Matthew Smith. "Manifestos and the “two faces” of parties." Party Politics 24, no. 3 (June 6, 2016): 278–88. http://dx.doi.org/10.1177/1354068816648355.

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It is commonplace to see references to parties’ manifestos as their written issue “profiles,” and changes in such documents as constituting changes in the parties’ “images” or “identities,” with the latter terms often used interchangeably to capture the role of platforms. This article argues, however, that projection of a party’s “image” and its “identity” are two different functions for a manifesto, not just one, and that it is important for the building and testing of theory that this distinction be maintained. Parties are, after all, addressing two audiences simultaneously with one document, and the two dimensions provide two alternative objects of change which can be used strategically to please both audiences at once. The article employs existing manifesto-based measures of parties’ relative issue emphases and their positions on a range of issues as indicators of image and identity, respectively, and finds that the two are indeed empirically distinct. Then, an earlier test of the electoral performance hypothesis as applied to emphasis change is replicated with data designed to capture change in issue positions. The test provides evidence for the prudence of maintaining the distinction between emphasis and position as two different dimensions of party profile change.

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Arham, M., Baso Mukhlis, Nurhani Amin, Agustinus Kali, and Muh Aristo Indrajaya. "PENGARUH KEMIRINGAN DAN ARAH HADAPAN PEMASANGAN PHOTOVOLTAIC PENERANGAN JALAN UMUM (PJU) DI UNIVERSITAS TADULAKO TERHADAP DAYA OUTPUT." Foristek 12, no. 1 (May 29, 2022): 1–11. http://dx.doi.org/10.54757/fs.v12i1.139.

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Utilization of solar energy in the generation of electrical energy has been widely carried out using solar panels. One example of its use at Tadulako University is public street lighting using solar energy as a source of electricity. The solar panels that have been installed so far have not been effective because of the different tilt angle positions. There are those who can capture the maximum rays of the sun and there are those who cannot capture the maximum rays of the sun and consequently the electrical energy generated is not optimal.The purpose of this study was to determine the effect of changes in orientation and angle of inclination of solar panels on the output power and to optimize the performance of PLTS-based public street lighting in Tadulako University. The method used to determine the effect of the photovoltaic slope on the output power is to measure the short-circuit voltage and current from various forward directions and tilt angles.The influence of the slope and the direction of the front of the photovoltaic installation can be seen that the highest output voltage is 18.82V in the forward-to-west position with an angle of 5˚. The highest short-circuit current is 3.82A in the front-to-west position with a slope angle of 5˚. The highest output power is 47.97W in the front-to-west position with a slope angle of 5˚.

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McGauvran, Ronald J., and Brandon Stewart. "Turning discontent into votes: Economic inequality and ethnic outbidding." Research & Politics 8, no. 4 (October 2021): 205316802110678. http://dx.doi.org/10.1177/20531680211067881.

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Ethnic outbidding, where parties adopt ever more extreme positions to capture electoral advantage, has become an increasingly common practice among ethnic parties. As economic issues have often served as a catalyst for ethnic tension, increasing levels of economic inequality should lead parties to adopt more extreme positions in an attempt to outbid one another. Furthermore, as their economic and ethnic platforms will appeal to the same ethnically defined constituency, ethnic outbidding should be more effective where inequality is high. Using a sample of over 150 ethnonational parties in Europe between 2011 and 2017, this paper finds that inequality is linked to increasing ideological extremism along a number of policy dimensions. Employing local-level voting data for Romania and Slovakia, we show that higher inequality makes adopting a more ideological extreme position a more successful electoral strategy, especially where economic issues are ethnically salient.

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Journal articles on the topic 'Capteur position'

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