1,107 results on '"Tamas G"'
Search Results
152. Vortex Waistlines
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Kovács, Tamás G., Tomboulis, E. T., Greensite, Jeff, editor, and Olejník, Štefan, editor
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- 2002
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153. Input-to-State Safety with Input Delay in Longitudinal Vehicle Control
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Tamas G. Molnar, Anil Alan, Adam K. Kiss, Aaron D. Ames, and Gábor Orosz
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FOS: Computer and information sciences ,Computer Science - Robotics ,Control and Systems Engineering ,FOS: Electrical engineering, electronic engineering, information engineering ,FOS: Mathematics ,Systems and Control (eess.SY) ,Dynamical Systems (math.DS) ,Mathematics - Dynamical Systems ,Robotics (cs.RO) ,Electrical Engineering and Systems Science - Systems and Control - Abstract
Safe longitudinal control is discussed for a connected automated truck traveling behind a preceding connected vehicle. A controller is proposed based on control barrier function theory and predictor feedback for provably safe, collision-free behavior by taking into account the significant response time of the truck as input delay and the uncertainty of its dynamical model as input disturbance. The benefits of the proposed controller compared to control designs that neglect the delay or treat the delay as disturbance are shown by numerical simulations., Accepted to the 17th IFAC Workshop on Time Delay Systems. 6 pages, 3 figures
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- 2022
154. Energy-efficient Connected Cruise Control with Lean Penetration of Connected Vehicles
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Minghao Shen, Chaozhe R. He, Tamas G. Molnar, A. Harvey Bell, and Gábor Orosz
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Computer Science::Robotics ,Mechanical Engineering ,Automotive Engineering ,FOS: Electrical engineering, electronic engineering, information engineering ,Systems and Control (eess.SY) ,Electrical Engineering and Systems Science - Systems and Control ,Computer Science Applications - Abstract
This paper focuses on energy-efficient longitudinal controller design for a connected automated truck that travels in mixed traffic consisting of connected and non-connected vehicles. The truck has access to information about connected vehicles beyond line of sight using vehicle-to-vehicle (V2V) communication. A novel connected cruise control design is proposed which incorporates additional delays into the control law when responding to distant connected vehicles to account for the finite propagation of traffic waves. The speeds of non-connected vehicles are modeled as stochastic processes. A fundamental theorem is proven which links the spectral properties of the motion signals to the average energy consumption. This enables us to tune controller parameters and maximize energy efficiency. Simulations with synthetic data and real traffic data are used to demonstrate the energy efficiency of the control design. It is demonstrated that even with lean penetration of connected vehicles, our controller can bring significant energy savings., This is submitted to IEEE Transactions on Intelligent Transportation Systems
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- 2022
155. Author response for 'The <scp>SKP2</scp> ‐p27 axis defines susceptibility to cell death upon <scp>CHK1</scp> inhibition'
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null Michael Lohmüller, null Bernhard F. Roeck, null Tamas G. Szabo, null Marina Schapfl, null Fragka Pegka, null Sebastian Herzog, null Andreas Villunger, and null Fabian Schuler
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- 2022
156. Self-Supervised Online Learning for Safety-Critical Control using Stereo Vision
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Ryan K. Cosner, Ivan D. Jimenez Rodriguez, Tamas G. Molnar, Wyatt Ubellacker, Yisong Yue, Aaron D. Ames, and Katherine L. Bouman
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FOS: Computer and information sciences ,Computer Science - Robotics ,Robotics (cs.RO) - Abstract
With the increasing prevalence of complex vision-based sensing methods for use in obstacle identification and state estimation, characterizing environment-dependent measurement errors has become a difficult and essential part of modern robotics. This paper presents a self-supervised learning approach to safety-critical control. In particular, the uncertainty associated with stereo vision is estimated, and adapted online to new visual environments, wherein this estimate is leveraged in a safety-critical controller in a robust fashion. To this end, we propose an algorithm that exploits the structure of stereo-vision to learn an uncertainty estimate without the need for ground-truth data. We then robustify existing Control Barrier Function-based controllers to provide safety in the presence of this uncertainty estimate. We demonstrate the efficacy of our method on a quadrupedal robot in a variety of environments. When not using our method safety is violated. With offline training alone we observe the robot is safe, but overly-conservative. With our online method the quadruped remains safe and conservatism is reduced., 7 pages, 4 figures, conference publication at ICRA 2022
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- 2022
157. Instantons and Fermions on the Lattice
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Kovacs, Tamas G., Mitrjushkin, V., editor, and Schierholz, G., editor
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- 2000
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158. Real and Virtual Compton Scattering (experiments)
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VCS collaboration at MAMI, d’Hose, Nicole, Bartsch, P., Baumann, D., Berthot, J., Bertin, P. Y., Breton, V., Boeglin, W. U., Böhm, R., Caprano, T., Derber, S., Degrande, N., Ding, M., Distler, M. O., Ducret, J. E., Edelhoff, R., Ewald, I., Fonvieille, H., Friedrich, J., Friedrich, J. M., Geiges, R., Gousset, Th., Guichon, P. A. M., Holvoet, H., Hyde-Wright, Ch., Jennewein, P., Kahrau, M., Kerhoas, S., Korn, M., Kramer, H., Krygier, K. W., Kunde, V., Lannoy, B., Lhuillier, D., Liesenfeld, A., Marchand, C., Marchand, D., Martino, J., Merkel, H., Merle, K., Merle, P., De Meyer, G., Mougey, J., Neuhausen, R., Offermann, E., Pospischil, Th., Quemener, G., Ravel, O., Roblin, Y., Roche, J., Rohe, D., Rosner, G., Ryckbosch, D., Sauer, P., Schmieden, H., Schardt, S., Tamas, G., Tytgat, M., Vanderhaeghen, M., Van Hoorebeke, L., Van de Vyver, R., Van de Wiele, J., Vernin, P., Wagner, A., Walcher, Th., Wolf, S., Plessas, W., editor, Simula, Silvano, editor, Saghai, Bijan, editor, Mukhopadhyay, Nimai C., editor, and Burkert, Volker D., editor
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- 1999
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159. Virtual Compton Scattering at MAMI γ*p→ γ1p1
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Kerhoas, S., Bartsch, P., Berthot, J., Bertin, P. Y., Breton, V., Boeglin, W. U., Böhm, R., d’Hose, N., Caprano, T., Derber, S., Degrande, N., Distler, M., Ducret, J. E., Edelhoff, R., Ewald, I., Fonvieille, H., Friedrich, J., Friedrich, J. M., Geiges, R., Gousset, Th., Guichon, P. A. M., Holvoet, H., Hyde-Wright, Ch., Jennewein, P., Kahrau, M., Korn, M., Kramer, H., Krygier, K. W., Kunde, V., Lannoy, B., Lhuillier, D., Liesenfeld, A., Marchand, C., Marchand, D., Martino, J., Merkel, H., Merle, K., Merle, P., De Meyer, G., Mougey, J., Neuhausen, R., Offerman, E., Pospischil, Th., Quemener, G., Ravel, O., Roblin, Y., Roche, J., Rosner, G., Ryckbosch, D., Sauer, P., Schmieden, H., Schardt, S., Tamas, G., Tytgat, M., Vanderhaeghen, M., van Hoorebeke, L., van de Vyver, R., van de Wiele, J., Vernin, P., Wagner, A., Walcher, Th., Wolf, S., Plessas, W., editor, Desplanques, Bertrand, editor, Protasov, Konstantin, editor, Silvestre-Brac, Bernard, editor, and Carbonell, Jaume, editor
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- 1999
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160. Self-Supervised Online Learning for Safety-Critical Control using Stereo Vision
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Cosner, Ryan K., primary, Rodriguez, Ivan D. Jimenez, additional, Molnar, Tamas G., additional, Ubellacker, Wyatt, additional, Yue, Yisong, additional, Ames, Aaron D., additional, and Bouman, Katherine L., additional
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- 2022
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161. Model-Free Safety-Critical Control for Robotic Systems
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Molnar, Tamas G., primary, Cosner, Ryan K., additional, Singletary, Andrew W., additional, Ubellacker, Wyatt, additional, and Ames, Aaron D., additional
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- 2022
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162. PIDD1 in cell cycle control, sterile inflammation and cell death
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Weiler, Elias S., primary, Szabo, Tamas G., additional, Garcia-Carpio, Irmina, additional, and Villunger, Andreas, additional
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- 2022
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163. Revising cancer incidence in a Central European country: a Hungarian nationwide study between 2011–2019 based on a health insurance fund database
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Zoltán Kiss, Tamás G. Szabó, Csaba Polgár, Zsolt Horváth, Péter Nagy, Ibolya Fábián, Valéria Kovács, György Surján, Zsófia Barcza, István Kenessey, András Wéber, István Wittmann, Gergő Attila Molnár, Eszter Gyöngyösi, Angéla Benedek, Eugenia Karamousouli, Zsolt Abonyi-Tóth, Renáta Bertókné Tamás, Diána Viktória Fürtős, Krisztina Bogos, Judit Moldvay, Gabriella Gálffy, Lilla Tamási, Veronika Müller, Zoárd Tibor Krasznai, Gyula Ostoros, Zsolt Pápai-Székely, Anikó Maráz, Gabriella Branyiczkiné Géczy, Lászlóné Hilbert, Láśzló Tamás Berki, György Rokszin, and Zoltán Vokó
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cancer burden ,cancer incidence ,cancer mortality ,financial health insurance database ,real-wold data ,Hungary ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
BackgroundThe nationwide HUN-CANCER EPI study examined cancer incidence and mortality rates in Hungary from 2011 to 2019.MethodsUsing data from the National Health Insurance Fund (NHIF) and Hungarian Central Statistical Office (HCSO), our retrospective study analyzed newly diagnosed malignancies between Jan 1, 2011, and Dec 31, 2019. Age-standardized incidence and mortality rates were calculated for all and for different tumor types using both the 1976 and 2013 European Standard Populations (ESP).FindingsThe number of newly diagnosed cancer cases decreased from 60,554 to 56,675 between 2011–2019. Age-standardized incidence rates were much lower in 2018, than previously estimated (475.5 vs. 580.5/100,000 person-years [PYs] in males and 383.6 vs. 438.5/100,000 PYs in females; ESP 1976). All-site cancer incidence showed a mean annual decrease of 1.9% (95% CI: 2.4%-1.4%) in men and 1.0% (95% CI:1.42%-0.66%) in women, parallel to mortality trends (-1.6% in males and -0.6% in females; ESP 2013). In 2018, the highest age-standardized incidence rates were found for lung (88.3), colorectal (82.2), and prostate cancer (62.3) in men, and breast (104.6), lung (47.7), and colorectal cancer (45.8) in women. The most significant decreases in incidence rates were observed for stomach (4.7%), laryngeal (4.4%), and gallbladder cancers (3.5%), with parallel decreases in mortality rates (3.9%, 2.7% and 3.2%, respectively).InterpretationWe found a lower incidence of newly diagnosed cancer cases for Hungary compared to previous estimates, and decreasing trends in cancer incidence and mortality, in line with global findings and the declining prevalence of smoking.
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- 2024
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164. Heme: A link between hemorrhage and retinopathy of prematurity progression
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Tamás Gáll, Dávid Pethő, Katalin Erdélyi, Virág Egri, Jázon György Balla, Annamária Nagy, Szilárd Póliska, Magnus Gram, Róbert Gábriel, Péter Nagy, József Balla, and György Balla
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Retinopathy ,Heme ,VEGF ,Hypoxia ,Rapamycin ,Mitochondria ,Medicine (General) ,R5-920 ,Biology (General) ,QH301-705.5 - Abstract
Neovascularization is implicated in the pathology of retinopathy of prematurity (ROP), diabetic retinopathy (DR), and age-related macular degeneration (AMD), which are the leading causes of blindness worldwide. In our work, we analyzed how heme released during hemorrhage affects hypoxic response and neovascularization. Our retrospective clinical analysis demonstrated, that hemorrhage was associated with more severe retinal neovascularization in ROP patients. Our heme-stimulated human retinal pigment epithelial (ARPE-19) cell studies demonstrated increased expression of positive regulators of angiogenesis, including vascular endothelial growth factor-A (VEGFA), a key player of ROP, DR and AMD, and highlighted the activation of the PI3K/AKT/mTOR/VEGFA pathway involved in angiogenesis in response to heme. Furthermore, heme decreased oxidative phosphorylation in the mitochondria, augmented glycolysis, facilitated HIF-1α nuclear translocation, and increased VEGFA/GLUT1/PDK1 expression suggesting HIF-1α-driven hypoxic response in ARPE-19 cells without effecting the metabolism of reactive oxygen species. Inhibitors of HIF-1α, PI3K and suppression of mTOR pathway by clinically promising drug, rapamycin, mitigated heme-provoked cellular response. Our data proved that oxidatively modified forms of hemoglobin can be sources of heme to induce VEGFA during retinal hemorrhage. We propose that hemorrhage is involved in the pathology of ROP, DR, and AMD.
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- 2024
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165. Best practices in robotic magnetic navigation-guided catheter ablation of cardiac arrhythmias, a position paper of the Society for Cardiac Robotic Navigation
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Anna M. E. Noten, Tamas Szili-Torok, Sabine Ernst, David Burkhardt, Diogo Cavaco, Xu Chen, Jim W. Cheung, Christian de Chillou, Eugene Crystal, Daniel H. Cooper, Maurizio Gasparini, Tamas Geczy, Konrad Goehl, Burkhard Hügl, Qi Jin, Priit Kampus, Pedram Kazemian, Muchtiar Khan, Ole Kongstad, Jarkko Magga, Darren Peress, Pekka Raatikainen, Alexander Romanov, Ole Rossvoll, Gurjit Singh, Radu Vatasescu, Sip Wijchers, Kohei Yamashiro, Sing-Chien Yap, and J. Peter Weiss
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robotic magnetic navigation ,catheter ablation ,atrial fibrillation ,ventricular arrhythmia ,remote magnetic navigation ,ventricular tachycardia ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
PreambleRobotic magnetic navigation (RMN)-guided catheter ablation (CA) technology has been used for the treatment of cardiac arrhythmias for almost 20 years. Various studies reported that RMN allows for high catheter stability, improved lesion formation and a superior safety profile. So far, no guidelines or recommendations on RMN-guided CA have been published.PurposeThe aim of this consensus paper was to summarize knowledge and provide recommendations on management of arrhythmias using RMN-guided CA as treatment of atrial fibrillation (AF) and ventricular arrhythmias (VA).MethodologyAn expert writing group, performed a detailed review of available literature, and drawing on their own experience, drafted and voted on recommendations and summarized current knowledge and practice in the field. Recommendations on RMN-guided CA are presented in a guideline format with three levels of recommendations to serve as a reference for best practices in RMN procedures. Each recommendation is accompanied by supportive text and references. The various sections cover the practical spectrum from system and patient set-up, EP laboratory staffing, combination of RMN with fluoroscopy and mapping systems, use of automation features and ablation settings and targets, for different cardiac arrhythmias.ConclusionThis manuscript, presenting the combined experience of expert robotic users and knowledge from the available literature, offers a unique resource for providers interested in the use of RMN in the treatment of cardiac arrhythmias.
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- 2024
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166. Surface-anchored N-based functional groups driven photoactivity of SrTiO3
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Áron Ágoston, Lilla Balassa, Mohit Yadav, Cintia Hajdu, Gergő Ballai, Zoltán Kovács, Tamás Gyulavári, Karolina Solymos, Ákos Kukovecz, Zoltán Kónya, and Zsolt Pap
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Strontium titanate ,Surface amine ,Nitrogen doping ,Photocatalytic CO2 conversion ,Phenol photooxidation ,Electron trapping ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Surface modification, including the anchoring of functional groups is a popular method to increase the photocatalytic activity of semiconductor photocatalysts. These species can trap excited electrons, thus prolonging the life of the charge carriers. N-containing functional groups are suitable for this purpose due to their high electron density. Here, we report a facile synthesis method for preparing interfacial N-based functional groups-modified and nitrogen-doped SrTiO3 photocatalysts. Among the modified samples (with 0.42–11.14 at.% nominal nitrogen content), the one with 7.71 at.% nitrogen showed 6.4 times higher photooxidation efficiency for phenol and 2.2 times better photoreduction efficiency for CO2 conversion than the unmodified SrTiO3 reference. Characterization results showed that using a low amount of nitrogen source resulted in low but measurable nitrogen doping, which did not significantly affect the photocatalytic activity. The formation of surface amine groups was significant even at lower initial nitrogen concentrations, while higher amounts of nitrogen source gradually resulted in the incorporation of nitrogen in higher amounts. Surface amine groups decreased the recombination of charge carriers, resulting in increased photocatalytic activity.
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- 2024
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167. PIDD1 in cell cycle control, sterile inflammation and cell death
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Elias S. Weiler, Tamas G. Szabo, Irmina Garcia-Carpio, and Andreas Villunger
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Inflammation ,Death Domain Receptor Signaling Adaptor Proteins ,Cell Death ,Caspases ,Caspase 2 ,Humans ,Apoptosis ,CRADD Signaling Adaptor Protein ,Cell Cycle Checkpoints ,Biochemistry - Abstract
The death fold domain-containing protein PIDD1 has recently attracted renewed attention as a regulator of the orphan cell death-related protease, Caspase-2. Caspase-2 can activate p53 to promote cell cycle arrest in response to centrosome aberrations, and its activation requires formation of the PIDDosome multi-protein complex containing multimers of PIDD1 and the adapter RAIDD/CRADD at its core. However, PIDD1 appears to be able to engage with multiple client proteins to promote an even broader range of biological responses, such as NF-κB activation, translesion DNA synthesis or cell death. PIDD1 shows features of inteins, a class of self-cleaving proteins, to create different polypeptides from a common precursor protein that allow it to serve these diverse functions. This review summarizes structural information and molecular features as well as recent experimental advances that highlight the potential pathophysiological roles of this unique death fold protein to highlight its drug-target potential.
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- 2022
168. Disturbance Observers for Robust Safety-critical Control with Control Barrier Functions
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Anil Alan, Tamas G. Molnar, Ersin Das, Aaron D. Ames, and Gabor Orosz
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Control and Optimization ,Control and Systems Engineering ,FOS: Electrical engineering, electronic engineering, information engineering ,Systems and Control (eess.SY) ,Electrical Engineering and Systems Science - Systems and Control - Abstract
This work provides formal safety guarantees for control systems with disturbance. A disturbance observer-based robust safety-critical controller is proposed, that estimates the effect of the disturbance on safety and utilizes this estimate with control barrier functions to attain provably safe dynamic behavior. The observer error bound - which consists of transient and steady-state parts - is quantified, and the system is endowed with robustness against this error via the proposed controller. An adaptive cruise control problem is used as illustrative example through simulations including real disturbance data., Comment: 6 pages, 5 figures
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- 2022
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169. Topology and the Dirac Spectrum in Hot QCD
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Tamas G. Kovacs
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High Energy Physics - Theory ,High Energy Physics - Lattice ,High Energy Physics - Theory (hep-th) ,High Energy Physics - Lattice (hep-lat) ,FOS: Physical sciences - Abstract
It is known that contrary to expectations, the order parameter of chiral symmetry breaking, the Dirac spectral density at zero virtuality does not vanish above the critical temperature of QCD. Instead, the spectral density develops a pronounced peak at zero. We show that the spectral density in the peak has large violations of the expected volume scaling. This anomalous scaling and the statistics of these eigenmodes is consistent with them being produced by mixing instanton and antiinstanton zero modes. Consequently, we show that a nonvanishing topological usceptibility implies a finite density of eigenvalues around zero, which can have implications on the restoration of chiral symmetry above the critical temperature., Comment: 9 pages, 7 figures, Proceedings of the 39th Annual International Symposium on Lattice Field Theory (Lattice 2022), August 8-13 2022, Bonn, Germany
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- 2022
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170. Double Pion Photoproduction on the Proton up to 800 MeV
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Braghieri, A., Murphy, L. Y., Ahrens, J., Audit, G., d’Hose, N., Isbert, V., Kerhoas, S., Laget, J. M., Cormick, M. Mac, Pedroni, P., Pinelli, T., Tamas, G., Zabrodin, A., Mitter, H., editor, Plessas, W., editor, and Guardiola, Rafael, editor
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- 1996
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171. Proteomic characterization of thymocyte-derived microvesicles and apoptotic bodies in BALB/c mice
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Turiák, Lilla, Misják, Petra, Szabó, Tamás G., Aradi, Borbála, Pálóczi, Krisztina, Ozohanics, Oliver, Drahos, László, Kittel, Ágnes, Falus, András, Buzás, Edit I., and Vékey, Károly
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- 2011
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172. Input-to-State Safety with Input Delay in Longitudinal Vehicle Control
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Molnar, Tamas G., primary, Alan, Anil, additional, Kiss, Adam K., additional, Ames, Aaron D., additional, and Orosz, Gábor, additional
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- 2022
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173. Safety-Critical Control of Compartmental Epidemiological Models With Measurement Delays
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Aaron D. Ames, Gábor Orosz, Andrew Singletary, and Tamas G. Molnar
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0303 health sciences ,0209 industrial biotechnology ,2019-20 coronavirus outbreak ,medicine.medical_specialty ,Control and Optimization ,Coronavirus disease 2019 (COVID-19) ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Control (management) ,Psychological intervention ,02 engineering and technology ,Systems and Control (eess.SY) ,Dynamical Systems (math.DS) ,Electrical Engineering and Systems Science - Systems and Control ,Data modeling ,03 medical and health sciences ,020901 industrial engineering & automation ,Risk analysis (engineering) ,Control and Systems Engineering ,Control system ,Epidemiology ,medicine ,FOS: Electrical engineering, electronic engineering, information engineering ,FOS: Mathematics ,Mathematics - Dynamical Systems ,030304 developmental biology - Abstract
We introduce a methodology to guarantee safety against the spread of infectious diseases by viewing epidemiological models as control systems and by considering human interventions (such as quarantining or social distancing) as control input. We consider a generalized compartmental model that represents the form of the most popular epidemiological models and we design safety-critical controllers that formally guarantee safe evolution with respect to keeping certain populations of interest under prescribed safe limits. Furthermore, we discuss how measurement delays originated from incubation period and testing delays affect safety and how delays can be compensated via predictor feedback. We demonstrate our results by synthesizing active intervention policies that bound the number of infections, hospitalizations and deaths for epidemiological models capturing the spread of COVID-19 in the USA., Comment: Accepted to the IEEE Control System Letters (L-CSS) and the 2021 American Control Conference (ACC). 6 pages, 3 figures
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- 2021
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174. Verifying Safe Transitions between Dynamic Motion Primitives on Legged Robots
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Wyatt Ubellacker, Noel Csomay-Shanklin, Tamas G. Molnar, and Aaron D. Ames
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FOS: Computer and information sciences ,Computer Science - Robotics ,Robotics (cs.RO) - Abstract
Functional autonomous systems often realize complex tasks by utilizing state machines comprised of discrete primitive behaviors and transitions between these behaviors. This architecture has been widely studied in the context of quasi-static and dynamics-independent systems. However, applications of this concept to dynamical systems are relatively sparse, despite extensive research on individual dynamic primitive behaviors, which we refer to as "motion primitives." This paper formalizes a process to determine dynamic-state aware conditions for transitions between motion primitives in the context of safety. The result is framed as a "motion primitive graph" that can be traversed by standard graph search and planning algorithms to realize functional autonomy. To demonstrate this framework, dynamic motion primitives -- including standing up, walking, and jumping -- and the transitions between these behaviors are experimentally realized on a quadrupedal robot.
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- 2021
175. Bayesian Inference for Time Delay Systems with Application to Connected Automated Vehicles
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Tamas G. Molnar, Xunbi A. Ji, Gábor Orosz, and Alex Gorodetsky
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Set (abstract data type) ,symbols.namesake ,Acceleration ,Distribution (mathematics) ,Computer science ,Monte Carlo method ,symbols ,Experimental data ,Markov process ,Markov chain Monte Carlo ,Bayesian inference ,Algorithm - Abstract
In this paper, a Bayesian inference problem is set up to infer the time delay and the resistance models from the dynamics of a connected automated vehicle. The delayed rejection adaptive Metropolis Markov chain Monte Carlo method is applied to obtain the posterior distributions of time delay and resistance parameters simultaneously using experimental data. The estimations of the time delay are shown to be consistent among multiple datasets and different resistance models. The distribution of the posterior indicates that there exist multiple modes in time delay, corresponding to different behaviors in acceleration and deceleration.
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- 2021
176. Model-Free Safety-Critical Control for Robotic Systems
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Tamas G. Molnar, Ryan K. Cosner, Andrew W. Singletary, Wyatt Ubellacker, and Aaron D. Ames
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FOS: Computer and information sciences ,Control and Optimization ,Mechanical Engineering ,Biomedical Engineering ,Systems and Control (eess.SY) ,Dynamical Systems (math.DS) ,Electrical Engineering and Systems Science - Systems and Control ,Computer Science Applications ,Human-Computer Interaction ,Computer Science - Robotics ,Artificial Intelligence ,Control and Systems Engineering ,FOS: Electrical engineering, electronic engineering, information engineering ,FOS: Mathematics ,Computer Vision and Pattern Recognition ,Mathematics - Dynamical Systems ,Robotics (cs.RO) - Abstract
This paper presents a framework for the safety-critical control of robotic systems, when safety is defined on safe regions in the configuration space. To maintain safety, we synthesize a safe velocity based on control barrier function theory without relying on a -- potentially complicated -- high-fidelity dynamical model of the robot. Then, we track the safe velocity with a tracking controller. This culminates in model-free safety critical control. We prove theoretical safety guarantees for the proposed method. Finally, we demonstrate that this approach is application-agnostic. We execute an obstacle avoidance task with a Segway in high-fidelity simulation, as well as with a Drone and a Quadruped in hardware experiments., Accepted to the IEEE Robotics and Automation Letters (RA-L) and submitted to the 2022 IEEE International Conference on Robotics and Automation (ICRA). 8 pages, 5 figures
- Published
- 2021
177. Effect of hypercholesterolemia on circulating and cardiomyocyte-derived extracellular vesicles
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Csenger Kovácsházi, Szabolcs Hambalkó, Nabil V. Sayour, Tamás G. Gergely, Gábor B. Brenner, Csilla Pelyhe, Dóra Kapui, Bennet Y. Weber, Alexander L. Hültenschmidt, Éva Pállinger, Edit I. Buzás, Ádám Zolcsák, Bálint Kiss, Tamás Bozó, Csilla Csányi, Nikolett Kósa, Miklós Kellermayer, Róbert Farkas, Gellért B. Karvaly, Kieran Wynne, David Matallanas, Péter Ferdinandy, and Zoltán Giricz
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Exosome ,Obesity ,Dyslipidemia ,Proteomics ,Metabolomics ,Inflammation ,Medicine ,Science - Abstract
Abstract Hypercholesterolemia (HC) induces, propagates and exacerbates cardiovascular diseases via various mechanisms that are yet not properly understood. Extracellular vesicles (EVs) are involved in the pathomechanism of these diseases. To understand how circulating or cardiac-derived EVs could affect myocardial functions, we analyzed the metabolomic profile of circulating EVs, and we performed an in-depth analysis of cardiomyocyte (CM)-derived EVs in HC. Circulating EVs were isolated with Vezics technology from male Wistar rats fed with high-cholesterol or control chow. AC16 human CMs were treated with Remembrane HC supplement and EVs were isolated from cell culture supernatant. The biophysical properties and the protein composition of CM EVs were analyzed. THP1-ASC-GFP cells were treated with CM EVs, and monocyte activation was measured. HC diet reduced the amount of certain phosphatidylcholines in circulating EVs, independently of their plasma level. HC treatment significantly increased EV secretion of CMs and greatly modified CM EV proteome, enriching several proteins involved in tissue remodeling. Regardless of the treatment, CM EVs did not induce the activation of THP1 monocytes. In conclusion, HC strongly affects the metabolome of circulating EVs and dysregulates CM EVs, which might contribute to HC-induced cardiac derangements.
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- 2024
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178. Extracellular vesicles promote migration despite BRAF inhibitor treatment in malignant melanoma cells
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Afrodité Németh, Gréta L. Bányai, Nikolett K. Dobos, Tamás Kós, Anikó Gaál, Zoltán Varga, Edit I. Buzás, Delaram Khamari, Magdolna Dank, István Takács, A. Marcell Szász, and Tamás Garay
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Extracellular vesicles ,Melanoma ,Vemurafenib ,Dabrafenib ,Trametinib ,Single cell tracking ,Medicine ,Cytology ,QH573-671 - Abstract
Abstract Extracellular vesicles (EVs) constitute a vital component of intercellular communication, exerting significant influence on metastasis formation and drug resistance mechanisms. Malignant melanoma (MM) is one of the deadliest forms of skin cancers, because of its high metastatic potential and often acquired resistance to oncotherapies. The prevalence of BRAF mutations in MM underscores the importance of BRAF-targeted therapies, such as vemurafenib and dabrafenib, alone or in combination with the MEK inhibitor, trametinib. This study aimed to elucidate the involvement of EVs in MM progression and ascertain whether EV-mediated metastasis promotion persists during single agent BRAF (vemurafenib, dabrafenib), or MEK (trametinib) and combined BRAF/MEK (dabrafenib/trametinib) inhibition. Using five pairs of syngeneic melanoma cell lines, we assessed the impact of EVs – isolated from their respective supernatants – on melanoma cell proliferation and migration. Cell viability and spheroid growth assays were employed to evaluate proliferation, while migration was analyzed through mean squared displacement (MSD) and total traveled distance (TTD) measurements derived from video microscopy and single-cell tracking. Our results indicate that while EV treatments had remarkable promoting effect on cell migration, they exerted only a modest effect on cell proliferation and spheroid growth. Notably, EVs demonstrated the ability to mitigate the inhibitory effects of BRAF inhibitors, albeit they were ineffective against a MEK inhibitor and the combination of BRAF/MEK inhibitors. In summary, our findings contribute to the understanding of the intricate role played by EVs in tumor progression, metastasis, and drug resistance in MM.
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- 2024
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179. Exact overlaps for all integrable two-site boundary states of gl $$ \mathfrak{gl} $$ (N) symmetric spin chains
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Tamas Gombor
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Bethe Ansatz ,Lattice Integrable Models ,AdS-CFT Correspondence ,Wilson, ’t Hooft and Polyakov loops ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract We find closed formulas for the overlaps of Bethe eigenstates of gl $$ \mathfrak{gl} $$ (N) symmetric spin chains and integrable boundary states. We derive the general overlap formulas for gl $$ \mathfrak{gl} $$ (M) ⊕ gl $$ \mathfrak{gl} $$ (N − M) symmetric boundary states and give a well-established conjecture for the sp $$ \mathfrak{sp} $$ (N) symmetric case. Combining these results with the previously derived so $$ \mathfrak{so} $$ (N) symmetric formula, now we have the overlap functions for all integrable boundary states of the gl $$ \mathfrak{gl} $$ (N) spin chains which are built from two-site states. The calculations are independent from the representations of the quantum space therefore our formulas can be applied for the SO(6) and the alternating SU(4) spin chains which describe the scalar sectors of N $$ \mathcal{N} $$ = 4 super Yang-Mills and ABJM theories which are important application areas of our results.
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- 2024
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180. Environmental significance of the interaction between titanium dioxides and soil solutions
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Karolina Solymos, Izabella Babcsányi, Badam Ariya, Tamás Gyulavári, Áron Ágoston, Ákos Kukovecz, Zoltán Kónya, and Zsolt Pap
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Titania ,Soil solution ,Chernozem ,Regosol ,Photocatalysis ,Environmental sciences ,GE1-350 ,Environmental law ,K3581-3598 - Abstract
Abstract Nanotechnology, especially in the field of photocatalysis, has witnessed rapid advancements, with titanium dioxide being one of the most widely used photocatalysts. As the use of products containing photoactive nanomaterials increases, concerns have arisen regarding their potential release into the environment over time. This release can impact soil, groundwater, and surrounding ecosystems, resulting in nanoparticles being dispersed in water and eventually depleted from the system. This study aimed to investigate how different soil solutions affect the structural, textural properties, and photocatalytic activity of titanium dioxide-based, commercial reference Evonik Aeroxide P25. The Regosol soil solution, characterized by acidic pH, low ionic content, and high organic matter content, induced nanoparticle aggregation and bandgap changes. In addition, the acidic pH hindered the adsorption process, potentially affecting the photocatalytic processes. In contrast, the Chernozem soil solution, with slightly alkaline pH, high ionic content, and low organic matter content, did not significantly alter the morphology or structure of the material. However, various organic compounds were absorbed on the surface, reducing the availability of active sites. The study highlights the importance of understanding the influence of soil solutions on nanomaterials, as it impacts their properties and environmental risks. Results show that the material is still activated, i.e., it can exert its photoactive effect on the environment. This sheds light on the challenges posed by nanoparticles in soil, particularly in terms of their toxicity and consequences for the surrounding ecosystems. The study underlines the need for further research in this area to assess potential risks and optimise the use of nanomaterials in environmental remediation.
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- 2024
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181. Accelerating targeted mosquito control efforts through mobile West Nile virus detection
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Zsaklin Varga, Rubén Bueno-Marí, José Risueño Iranzo, Kornélia Kurucz, Gábor Endre Tóth, Brigitta Zana, Safia Zeghbib, Tamás Görföl, Ferenc Jakab, and Gábor Kemenesi
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Mosquito-borne pathogens ,Surveillance ,Prevention ,Field-based ,Rapid diagnostics ,Bagaza ,Infectious and parasitic diseases ,RC109-216 - Abstract
Abstract Background Different mosquito control strategies have been implemented to mitigate or prevent mosquito-related public health situations. Modern mosquito control largely relies on multiple approaches, including targeted, specific treatments. Given this, it is becoming increasingly important to supplement these activities with rapid and mobile diagnostic capacities for mosquito-borne diseases. We aimed to create and test the applicability of a rapid diagnostic system for West Nile virus that can be used under field conditions. Methods In this pilot study, various types of adult mosquito traps were applied within the regular mosquito monitoring activity framework for mosquito control. Then, the captured specimens were used for the detection of West Nile virus RNA under field conditions with a portable qRT-PCR approach within 3–4 h. Then, positive samples were subjected to confirmatory RT-PCR or NGS sequencing in the laboratory to obtain genome information of the virus. We implemented phylogenetic analysis to characterize circulating strains. Results A total of 356 mosquito individuals representing 7 species were processed in 54 pools, each containing up to 20 individuals. These pools were tested for the presence of West Nile virus, and two pools tested positive, containing specimens from the Culex pipiens and Anopheles atroparvus mosquito species. As a result of subsequent sequencing, we present the complete genome of West Nile virus and Bagaza virus. Conclusions The rapid identification of infected mosquitoes is the most important component of quick response adulticide or larvicide treatments to prevent human cases. The conceptual framework of real-time surveillance can be optimized for other pathogens and situations not only in relation to West Nile virus. We present an early warning system for mosquito-borne diseases and demonstrate its application to aid rapid-response mosquito control actions. Graphical Abstract
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- 2024
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182. Different methods of determining centric relation – comparison with a digital mandibular motion analyser
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Bálint Jász, Szilvia Ambrus, Tamás Garay, Péter Schmidt, Péter Hermann, Szandra Körmendi, and Máté Jász
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Centric relation ,Gothic arch tracing ,Dawson’s method ,Digital motion analysis ,Dentistry ,RK1-715 - Abstract
Abstract Background Finding and registering the maxillary–mandibular jaw relation is crucial in dental practice. Several comparative studies have been conducted to investigate the reproducibility and accuracy of techniques for determining the centric relation (CR) position of the mandible. The aim of our study was to determine which of seven different CR determination methods had the smallest deviation from the theoretical zero with the help of a digital mandibular motion analyser. The chosen theoretical zero position, the maximal intercuspal position (MIP), is the most reproducible and widely used position. Methods Thirty-four volunteers (24 females and 10 males) with a mean (SD) age of 29.1 (± 7.3) years with a negative history of temporomandibular disorder (TMD) participated in the study. A digital mandibular motion analyser was used to register the condylar position after the use of each technique for the determination of CR. The calibration was performed to the maximal intercuspal position (MIP) for each volunteer. The investigated techniques were (A) the gothic arch tracer, (B) the adduction field method, (C) Dawson’s bimanual manipulation, (D) the patient placing the tongue tip on the palatal rugae, (E) the patient placing the tongue tip to the border of the hard and soft palate, (F) the patient actively pulling the chin backwards, and (G) the examiner pushing the patient’s chin back. Results The position of the mandibular condyle was illustrated in a three-dimensional coordinate system, where the origin represented the MIP. Among the seven methods examined, five showed significant deviations compared to the MIP. Among these, two methods resulted in posterior deviation of the condyles. Methods C and E coincided with the MIP in all directions. Conclusions Within the limitations of our study, we found that the smallest deviations from our theoretical zero (MIP) among the investigated centric relation determining methods were obtained with the bimanual mandibular manipulation technique derived from Dawson and the placement of the tongue tip on the border of the hard and soft palate (linguomandibular homotrophy theory).
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- 2024
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183. Submicroscopic accessory minerals overprinting clay mineral REE patterns (celadonite–glauconite group examples)
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Tóth, Erzsébet, Weiszburg, Tamás G., Jeffries, Teresa, Williams, C. Terry, Bartha, András, Bertalan, Éva, and Cora, Ildikó
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- 2010
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184. Somatic HCN channels augment and speed up GABAergic basket cell input-output function in human neocortex
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Barzo P, Tamas G, Furdan S, Bakos E, Szegedi, and Lamsa K
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Input/output ,medicine.anatomical_structure ,Neocortex ,Speedup ,nervous system ,Computer science ,Basket cell ,Somatic cell ,medicine ,GABAergic ,Function (mathematics) ,Augment ,Neuroscience - Abstract
Neurons in the mammalian brain exhibit evolution-driven species-specific differences in their functional properties. Therefore, understanding the human brain requires unraveling the human neuron “uniqueness” and how it contributes to the operation of specific neuronal circuits. We show here that a highly abundant type of inhibitory neurons in the neocortex, GABAergic parvalbumin-expressing basket cell (pv+BC), exhibits in the human brain a specific somatic leak current mechanism, which is absent in their rodent neuronal counterparts. Human pv+BC soma shows electric leak conductance mediated by hyperpolarization-activated cyclic nucleotide-gated channels. This leak conductance has depolarizing effects on the resting membrane potential and it accelerates the rise of synaptic potentials in the cell soma. The leak facilitates the human pv+BC input-to-output fidelity and shortens the action potential generation to excitatory inputs. This mechanism constitutes an adaptation that enhances signal transmission fidelity and speed in the common inhibitory circuit in the human but not in the rodent neocortex.
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- 2021
185. From Subjectivity to Privacy and Back Again
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TAMÁS, G. M.
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- 2002
186. Safety-Critical Control of Compartmental Epidemiological Models With Measurement Delays
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Molnar, Tamas G., primary, Singletary, Andrew W., additional, Orosz, Gabor, additional, and Ames, Aaron D., additional
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- 2021
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187. Verifying Safe Transitions between Dynamic Motion Primitives on Legged Robots
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Ubellacker, Wyatt, primary, Csomay-Shanklin, Noel, additional, Molnar, Tamas G., additional, and Ames, Aaron D., additional
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- 2021
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188. Measurement-Robust Control Barrier Functions: Certainty in Safety with Uncertainty in State
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Cosner, Ryan K., primary, Singletary, Andrew W., additional, Taylor, Andrew J., additional, Molnar, Tamas G., additional, Bouman, Katherine L., additional, and Ames, Aaron D., additional
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- 2021
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189. Bayesian Inference for Time Delay Systems with Application to Connected Automated Vehicles
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Ji, Xunbi A., primary, Molnar, Tamas G., additional, Gorodetsky, Alex A., additional, and Orosz, Gabor, additional
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- 2021
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190. Haematemesis as a sign of silent neonatal gastric perforation
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Parshotam Gera, Zi Qin Ng, and Tamas G Milassin
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medicine.medical_specialty ,business.industry ,Neonatal gastric perforation ,Pediatrics, Perinatology and Child Health ,medicine ,business ,Surgery ,Sign (mathematics) - Published
- 2020
191. Closed-form estimations of the bistable region in metal cutting via the method of averaging
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Gabor Stepan, Tamas G. Molnar, and Tamás Insperger
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Physics ,business.product_category ,Bistability ,Applied Mathematics ,Mechanical Engineering ,Mathematical analysis ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Method of averaging ,Machine tool ,Vibration ,Nonlinear system ,020303 mechanical engineering & transports ,Amplitude ,Numerical continuation ,0203 mechanical engineering ,Mechanics of Materials ,Limit (mathematics) ,0210 nano-technology ,business - Abstract
Machine tool vibrations in turning processes are analyzed by taking into account the nonlinearity of the cutting force characteristics. Unstable limit cycles are computed for the governing nonlinear delay-differential equation in order to determine the bistable technological parameter region where stable stationary cutting and large-amplitude machine tool vibrations coexist. Simple closed-form formulas are derived for the amplitude of limit cycles and for the size of the bistable region considering a general cutting force characteristics. The analytical results are determined by the method of averaging, which can be used to treat the nonlinearities without their third-order approximation. The results are confirmed by numerical continuation and using Melnikov’s integral.
- Published
- 2019
192. Certifying Safety for Nonlinear Time Delay Systems via Safety Functionals: A Discretization Based Approach
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Daniel Bachrathy, Gábor Orosz, Adam K. Kiss, Aaron D. Ames, and Tamas G. Molnar
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Set (abstract data type) ,Nonlinear system ,Mathematical optimization ,Discretization ,Computer science ,Simple (abstract algebra) ,Control system ,Convergence (routing) ,Scalar (physics) ,State space - Abstract
In this paper, we consider the safety of continuous time control systems with input delays. Safety functionals are constructed that define safety sets in the infinite-dimensional state space. Time-discretization is used in order to compute safety sets in finite dimensions and it is shown that these sets approach an infinite-dimensional safety set as the time step is decreased. A simple example of a nonlinear scalar system is used to demonstrate the convergence of the proposed methods.
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- 2021
193. MPC-Based Connected Cruise Control with Multiple Human Predecessors
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R. Austin Dollar, Gábor Orosz, Ardalan Vahidi, and Tamas G. Molnar
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Model predictive control ,Ideal (set theory) ,Control theory ,Computer science ,business.industry ,Optimal control ,business ,Automation ,Cruise control ,Motion (physics) ,Data modeling - Abstract
Model predictive control is applied to regulate the longitudinal motion of a connected automated vehicle in mixed traffic scenarios. A prediction method is proposed to enable model predictive control in low-automation, medium-connectivity situations using instantaneous motion information from multiple predecessor vehicles. This includes detection of unconnected vehicles that may be mixed between connected ones. Simulations using real human driver data for the predecessors show that, if the drivers are well-characterized on average, a hidden unconnected vehicle can be detected over 90 % of the time. Moreover, the resulting preview can recover 46 % of the gap in energy performance between single-predecessor prediction and ideal preview. Results are also compared to a classical controller that utilizes instantaneous information from multiple predecessors.
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- 2021
194. Saving Energy with Delayed Information in Connected Vehicle Systems
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Russell P. Zukouski, Tamas G. Molnar, A. Harvey Bell, Jim Yan, Gábor Orosz, Matthew Hunkler, Minghao Shen, Dean Alan Oppermann, and Chaozhe R. He
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Truck ,Connected vehicle ,Computer science ,Control theory ,Robustness (computer science) ,Control (management) ,Energy consumption ,Energy (signal processing) ,Automotive engineering ,Efficient energy use - Abstract
In this paper, we design an energy-optimal longitudinal controller for connected automated trucks driving in mixed traffic with lean penetration of connected vehicles. The controller utilizes information received via vehicle-to-vehicle connectivity from vehicles traveling ahead of the truck, and additional delays are introduced into the control law to improve energy efficiency. We evaluate the robustness of the energy-optimal control parameters and calculate the amount of energy benefits. Simulation results show 18% improvement of energy efficiency compared to a non-connected design, and 3% improvement compared to the connected design without additional delay.
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- 2021
195. Influence of rapid heat treatment on the photocatalytic activity and stability of calcium titanates against a broad range of pollutants
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Mahsa Abedi, Zsejke-Réka Tóth, Milica Todea, Áron Ágoston, Ákos Kukovecz, Zoltán Kónya, Zsolt Pap, and Tamás Gyulavári
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Photocatalysis ,Calcium titanate ,Rapid calcination ,Composite ,Stability ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Calcium titanate (CTO) photocatalysts were synthesized using a sol–gel method by adopting a cost-efficient, rapid calcination technique. The CTOs were characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, infrared spectroscopy, nitrogen adsorption, porosimetry measurements, scanning/transmission electron microscopy, and diffuse reflectance spectroscopy. Their photocatalytic activity was assessed through the photocatalytic degradation of phenol, oxalic acid, and chlorophenol under UV light exposure, using a commercial CTO as a reference. The stability of the samples was evaluated using compounds with –OH, –COOH, and –Cl functional groups. Characterization results showed that CTO composites containing anatase, rutile, and brookite titania were obtained. Increasing the calcination temperature led to various crystalline compositions, higher crystallinity, larger primary crystallite sizes, and smaller specific surface areas. The photocatalytic activity of all CTO/TiO2 composites was superior compared to the commercial CTO we used as a reference. The high photocatalytic activity of the best-performing composites was attributed to their higher specific surface areas and the synergistic effect between the crystal phases. A cost comparison was also made between our unique calcination technique and conventional calcination, and it was found that our method is approximately 35% more cost-effective, while retaining the photocatalytic activity.
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- 2024
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196. The utility of molecular studies on pancreatic cystic lesions: A comprehensive review
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Rong Xia, Xiaoying Liu, Cristina H. Hajdu, Wenqing Cao, James N. Kaz, Tamas Gonda, and Aylin Simsir
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Pancreatic cystic lesion ,Fine needle aspiration ,Cytopathology ,Molecular pathology ,NGS ,Pathology ,RB1-214 - Abstract
Pancreatic cystic lesions, frequently detected in abdominal imaging, pose diagnostic challenges due to their varying malignancy potential. This review article focuses on the crucial role of molecular diagnostics in differentiating these lesions, with an emphasis on the significance of KRAS and GNAS mutations identified through endoscopic ultrasound-guided fine needle aspiration (EUS-FNA). The use of next-generation sequencing (NGS) is highlighted for its precision in detecting genetic changes, crucial for accurate diagnosis and guiding management decisions.Integration of molecular studies into standardized reporting for pancreaticobiliary cytopathology is also discussed, enhancing diagnostic accuracy. The potential of precision oncology, informed by molecular insights, is explored for targeted treatments of pancreatic cystic lesions.Commercial platforms like PancreaSeq® Genomic Classifier and PancraGEN® are assessed for their effectiveness in analyzing pancreatic cystic fluid, proving beneficial in cases where traditional methods fall short.In summary, molecular studies are indispensable in evaluating pancreatic cystic lesions, offering a pathway to more personalized treatment and management strategies in patient-centered care.
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- 2024
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197. Measurement-Robust Control Barrier Functions: Certainty in Safety with Uncertainty in State
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Ryan K. Cosner, Andrew W. Singletary, Andrew J. Taylor, Tamas G. Molnar, Katherine L. Bouman, and Aaron D. Ames
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FOS: Electrical engineering, electronic engineering, information engineering ,Systems and Control (eess.SY) ,Electrical Engineering and Systems Science - Systems and Control - Abstract
The increasing complexity of modern robotic systems and the environments they operate in necessitates the formal consideration of safety in the presence of imperfect measurements. In this paper we propose a rigorous framework for safety-critical control of systems with erroneous state estimates. We develop this framework by leveraging Control Barrier Functions (CBFs) and unifying the method of Backup Sets for synthesizing control invariant sets with robustness requirements -- the end result is the synthesis of Measurement-Robust Control Barrier Functions (MR-CBFs). This provides theoretical guarantees on safe behavior in the presence of imperfect measurements and improved robustness over standard CBF approaches. We demonstrate the efficacy of this framework both in simulation and experimentally on a Segway platform using an onboard stereo-vision camera for state estimation., Comment: 6 pages, 4 figures
- Published
- 2021
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198. Open and closed loop traffic control by connected automated vehicles
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Michiel J. Van Nieuwstadt, Gábor Orosz, Devesh Upadhyay, Tamas G. Molnar, and Michael Hopka
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050210 logistics & transportation ,0209 industrial biotechnology ,Computer science ,Continuum (topology) ,05 social sciences ,Frame (networking) ,Stability (learning theory) ,Open-loop controller ,02 engineering and technology ,symbols.namesake ,020901 industrial engineering & automation ,Control theory ,0502 economics and business ,Computer Science::Networking and Internet Architecture ,symbols ,Benchmark (computing) ,Thermal stability ,Upstream (networking) ,Lagrangian - Abstract
The problem of controlling traffic using connected automated vehicles is approached by utilizing Lagrangian traffic models. A continuum model with time delay is introduced in the Lagrangian frame in order to capture the open loop dynamics of the traffic behind a vehicle of prescribed motion. The stability of the open loop system is analyzed and compared to that of a benchmark car-following model. Finally, the Lagrangian traffic models are used to propose a longitudinal controller for connected automated vehicles that allows them to respond to connected vehicles behind to stabilize the upstream traffic in a closed loop fashion.
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- 2020
199. PIDDosome-induced p53-dependent ploidy restriction facilitates hepatocarcinogenesis
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Laura Bongiovanni, Kaoru Tsuchia, Tatjana Stojakovic, Katja Knapp, Vincent Zoran Braun, Hubert Scharnagl, Nataliya Rohr-Udilova, Georg Semmler, Floris Foijer, Gerald Timelthaler, Andreas Villunger, Matthias Pinter, Alain de Bruin, Tamas G. Szabo, Diana C.J. Spierings, Bart Westendorp, Valentina C. Sladky, Thomas Reiberger, Ana Curinha, Hilda van den Bos, Pathobiologie, dPB RMSC, Dep Biomolecular Health Sciences, Damage and Repair in Cancer Development and Cancer Treatment (DARE), Stem Cell Aging Leukemia and Lymphoma (SALL), and Restoring Organ Function by Means of Regenerative Medicine (REGENERATE)
- Subjects
caspase-2 ,p53 ,Carcinogenesis ,medicine.medical_treatment ,CENTROSOME AMPLIFICATION ,caspase‐2 ,Liver transplantation ,medicine.disease_cause ,Biochemistry ,ACTIVATION ,Mice ,0302 clinical medicine ,Chromosome instability ,PIDD1 ,News & Views ,polyploidy ,0303 health sciences ,Cell Cycle ,Liver Neoplasms ,Articles ,hepatocellular carcinoma ,CANCER ,3. Good health ,TUMOR SUPPRESSION ,APOPTOSIS ,medicine.anatomical_structure ,Hepatocellular carcinoma ,Hepatocyte ,Ploidy ,Liver cancer ,Signal Transduction ,Carcinoma, Hepatocellular ,POLYPLOIDIZATION ,Biology ,HEPATOCYTE PLOIDY ,Article ,caspase‐ ,03 medical and health sciences ,medicine ,Genetics ,TUMORIGENESIS ,Animals ,Humans ,CASPASE-2 ,Molecular Biology ,030304 developmental biology ,Ploidies ,ANEUPLOIDY ,medicine.disease ,Centrosome ,Cancer research ,Tumor Suppressor Protein p53 ,030217 neurology & neurosurgery - Abstract
Polyploidization frequently precedes tumorigenesis but also occurs during normal development in several tissues. Hepatocyte ploidy is controlled by the PIDDosome during development and regeneration. This multi‐protein complex is activated by supernumerary centrosomes to induce p53 and restrict proliferation of polyploid cells, otherwise prone for chromosomal instability. PIDDosome deficiency in the liver results in drastically increased polyploidy. To investigate PIDDosome‐induced p53‐activation in the pathogenesis of liver cancer, we chemically induced hepatocellular carcinoma (HCC) in mice. Strikingly, PIDDosome deficiency reduced tumor number and burden, despite the inability to activate p53 in polyploid cells. Liver tumors arise primarily from cells with low ploidy, indicating an intrinsic pro‐tumorigenic effect of PIDDosome‐mediated ploidy restriction. These data suggest that hyperpolyploidization caused by PIDDosome deficiency protects from HCC. Moreover, high tumor cell density, as a surrogate marker of low ploidy, predicts poor survival of HCC patients receiving liver transplantation. Together, we show that the PIDDosome is a potential therapeutic target to manipulate hepatocyte polyploidization for HCC prevention and that tumor cell density may serve as a novel prognostic marker for recurrence‐free survival in HCC patients., Hepatocyte ploidy is controlled by the PIDDosome and its loss causes increased hepatocyte ploidy, which protects mice from developing liver cancer. High tumor cell density, a surrogate of low ploidy, predicts poor recurrence free survival in HCC patients.
- Published
- 2020
200. Measurement of the helicity-dependent total cross-section for the $ \pi^{0}_{}$ reaction
- Author
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Ahrens, J., Altieri, S., Annand, J. R. M., Arends, H. -J., Beck, R., Blackston, M. A., Bradtke, C., Braghieri, A., d’Hose, N., Dutz, H., Fix, A., Heid, E., Jahn, O., Klein, F., Kondratiev, R., Lang, M., Lisin, V., Martinez-Fabregate, M., McGeorge, J. C., Meyer, W., Panzeri, A., Pedroni, P., Pinelli, T., Protopopescu, D., Reicherz, G., Rohlof, Ch., Rosner, G., Rostomyan, T., Ryckbosch, D., Tamas, G., Thomas, A., Weller, H. R., and GDH and A2 Collaborations
- Published
- 2011
- Full Text
- View/download PDF
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