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2,827 results on '"Kumar, Avinash"'

171. Supersonic rotation of a superfluid: a long-lived dynamical ring

Author

Guo, Yanliang, Dubessy, Romain, de Herve, Mathieu de Goër, Kumar, Avinash, Badr, Thomas, Perrin, Aurélien, Longchambon, Laurent, and Perrin, Hélène

Subjects
Condensed Matter - Quantum Gases, Physics - Atomic Physics
Abstract

We present the experimental realization of a long-lived superfluid flow of a quantum gas rotating in an anharmonic potential, sustained by its own angular momentum. The gas is set into motion by rotating an elliptical deformation of the trap. An evaporation selective in angular momentum yields an acceleration of rotation until the density vanishes at the trap center, resulting in a dynamical ring with 350 hbar angular momentum per particle. The density profile of the ring corresponds to the one of a quasi two-dimensional superfluid, with a linear velocity reaching Mach 18 and a rotation lasting more than a minute., Comment: 5 pages + supplemental material

Published
2019
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174. Residual Reinforcement Learning for Robot Control

Author

Johannink, Tobias, Bahl, Shikhar, Nair, Ashvin, Luo, Jianlan, Kumar, Avinash, Loskyll, Matthias, Ojea, Juan Aparicio, Solowjow, Eugen, and Levine, Sergey

Subjects
Computer Science - Robotics, Computer Science - Machine Learning
Abstract

Conventional feedback control methods can solve various types of robot control problems very efficiently by capturing the structure with explicit models, such as rigid body equations of motion. However, many control problems in modern manufacturing deal with contacts and friction, which are difficult to capture with first-order physical modeling. Hence, applying control design methodologies to these kinds of problems often results in brittle and inaccurate controllers, which have to be manually tuned for deployment. Reinforcement learning (RL) methods have been demonstrated to be capable of learning continuous robot controllers from interactions with the environment, even for problems that include friction and contacts. In this paper, we study how we can solve difficult control problems in the real world by decomposing them into a part that is solved efficiently by conventional feedback control methods, and the residual which is solved with RL. The final control policy is a superposition of both control signals. We demonstrate our approach by training an agent to successfully perform a real-world block assembly task involving contacts and unstable objects., Comment: 7 pages

Published
2018

181. Contributors

Author

Abu Al-Haija, Qasem, primary, Adalarasu, K., additional, Adamović, Saša, additional, Ahmed, Nuredin, additional, Alnabhan, Mohammad, additional, Al-Omari, Mohammad, additional, Anamalamudi, Satish, additional, Arunkumar, T., additional, Bahalul Haque, A.K.M., additional, Benson, Jimmy Adebesin, additional, Bhushan, Bharat, additional, Chaganti, Raj, additional, Chibuzor, Linda, additional, Enduri, Murali Krishna, additional, Gnjatović, Milan, additional, Gudapati, Sai Sri Vineeth, additional, Hajarathaiah, Koduru, additional, Jagannath, M., additional, Kakandwar, Saumya, additional, Kalita, Saptadeepa, additional, Kevric, Jasmin, additional, Kumar, Avinash, additional, Lavanya, H.M., additional, Maček, Nemanja, additional, Nehinbe, Joshua Ojo, additional, Obaid, Ahmed J., additional, Pavlović, Nikola, additional, Radovanović, Dalibor, additional, Rahimi, Nick, additional, Rayan, Rehab A., additional, Saleh, Eyad, additional, Sangi, Abdur Rashid, additional, Šarac, Marko, additional, Saračević, Muzafer, additional, Shaari, Hala, additional, Sharma, Deepak, additional, Sharma, Sudhir Kumar, additional, Shristi, Sonal, additional, Soufiene, Ben Othman, additional, Tsagkaris, Christos, additional, Varsha, S., additional, Vukobrat, Nikola, additional, and Zafar, Imran, additional

Published
2023
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187. Emerging Paradigm of Urban Computing

Author

Kalita, Saptadeepa, primary, Kumar, Avinash, additional, Kumar, Anuj, additional, Kashyap, Snigdha, additional, Pokhriyal, Nandita, additional, and Nand, Parma, additional

Published
2022
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190. Magnetic Shape Memory Alloys: Phenomenological Constitutive Modeling and Analysis

Author

Kumar, Avinash, Haldar, Krishnendu, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, di Mare, Francesca, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Jonnalagadda, Krishna, editor, Alankar, Alankar, editor, Balila, Nagamani Jaya, editor, and Bhandakkar, Tanmay, editor

Published
2022
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191. Preserving Security and Privacy in IoT Using Machine Learning and Trust Management

Author

Kumar, Avinash, Bhowmik, Trisha, Sharma, Rohit, Bhardwaj, Abhishek, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Sharma, Devendra Kumar, editor, Peng, Sheng-Lung, editor, Sharma, Rohit, editor, and Zaitsev, Dmitry A., editor

Published
2022
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192. Preventing and Detecting Intrusion of Cyberattacks in Smart Grid by Integrating Blockchain

Author

Kumar, Avinash, Bhushan, Bharat, Nand, Parma, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Sharma, Devendra Kumar, editor, Peng, Sheng-Lung, editor, Sharma, Rohit, editor, and Zaitsev, Dmitry A., editor

Published
2022
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198. Road Traffic Emissions Lead to Much Enhanced New Particle Formation through Increased Growth Rates

Author

Brean, James, primary, Rowell, Alex, additional, Beddows, David C.S., additional, Weinhold, Kay, additional, Mettke, Peter, additional, Merkel, Maik, additional, Tuch, Thomas, additional, Rissanen, Matti, additional, Maso, Miikka Dal, additional, Kumar, Avinash, additional, Barua, Shawon, additional, Iyer, Siddharth, additional, Karppinen, Alexandra, additional, Wiedensohler, Alfred, additional, Shi, Zongbo, additional, and Harrison, Roy M., additional

Published
2024
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