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arXiv 2019年

作者： Elishco, Ohad Barg, Alexander Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College ParkMD20742 United States Russian Academy of Sciences Moscow127051 Russia

We introduce a dynamical model of node repair in distributed storage systems wherein the storage nodes are subjected to failures according to independent Poisson processes. The main parameter that we study is the time-average capacity of the network in the scenario where a fixed subset of the nodes support a higher repair bandwidth than the other nodes. The sequence of node failures generates random permutations of the nodes in the encoded block, and we model the state of the network as a Markov random walk on permutations of n elements. As our main result we show that the capacity of the network can be increased compared to the static (worst-case) model of the storage system, while maintaining the same (average) repair bandwidth, and we derive estimates of the increase. We also quantify the capacity increase in the case that the repair center has information about the sequence of the recently failed storage nodes. Copyright © 2019, The Authors. All rights reserved.

关键词： Repair

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Realizing topologically ordered states on a quantum processor

arXiv

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arXiv 2021年

作者： Satzinger, Kevin J. Liu, Y. Smith, A. Knapp, C. Newman, M. Jones, C. Chen, Z. Quintana, C. Mi, X. Dunsworth, A. Gidney, C. Aleiner, I. Arute, F. Arya, K. Atalaya, J. Babbush, R. Bardin, J.C. Barends, R. Basso, J. Bengtsson, A. Bilmes, A. Broughton, M. Buckley, B.B. Buell, D.A. Burkett, B. Bushnell, N. Chiaro, B. Collins, R. Courtney, W. Demura, S. Derk, A.R. Eppens, D. Erickson, C. Farhi, E. Foaro, L. Fowler, A.G. Foxen, B. Giustina, M. Greene, A. Gross, J.A. Harrigan, M.P. Harrington, S.D. Hilton, J. Hong, S. Huang, T. Huggins, W.J. Ioffe, L.B. Isakov, S.V. Jeffrey, E. Jiang, Z. Kafri, D. Kechedzhi, K. Khattar, T. Kim, S. Klimov, P.V. Korotkov, A.N. Kostritsa, F. Landhuis, D. Laptev, P. Locharla, A. Lucero, E. Martin, O. McClean, J.R. McEwen, M. Miao, K.C. Mohseni, M. Montazeri, S. Mruczkiewicz, W. Mutus, J. Naaman, O. Neeley, M. Neill, C. Niu, M.Y. O'Brien, T.E. Opremcak, A. Pató, B. Petukhov, A. Rubin, N.C. Sank, D. Shvarts, V. Strain, D. Szalay, M. Villalonga, B. White, T.C. Yao, Z. Yeh, P. Yoo, J. Zalcman, A. Neven, H. Boixo, S. Megrant, A. Chen, Y. Kelly, J. Smelyanskiy, V. Kitaev, A. Knap, M. Pollmann, F. Roushan, P. Google Quantum AI Mountain ViewCA United States Department of Physics Technical University of Munich Garching85748 Germany Schellingstr. 4 München80799 Germany School of Physics and Astronomy University of Nottingham NottinghamNG7 2RD United Kingdom Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems University of Nottingham NottinghamNG7 2RD United Kingdom Department of Physics Institute for Quantum Information and Matter California Institute of Technology PasadenaCA United States Walter Burke Institute for Theoretical Physics California Institute of Technology PasadenaCA United States Department of Electrical and Computer Engineering University of Massachusetts AmherstMA United States Laboratoire de Physique Theorique et Hautes Energies Sorbonne Université France Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics University of California Santa BarbaraCA United States Institute for Advanced Study Technical University of Munich Garching85748 Germany

The discovery of topological order has revolutionized the understanding of quantum matter in modern physics and provided the theoretical foundation for many quantum error correcting codes. Realizing topologically ordered states has proven to be extremely challenging in both condensed matter and synthetic quantum systems. Here, we prepare the ground state of the toric code Hamiltonian using an efficient quantum circuit on a superconducting quantum processor. We measure a topological entanglement entropy near the expected value of ln 2, and simulate anyon interferometry to extract the braiding statistics of the emergent excitations. Furthermore, we investigate key aspects of the surface code, including logical state injection and the decay of the non-local order parameter. Our results demonstrate the potential for quantum processors to provide key insights into topological quantum matter and quantum error correction. © 2021, CC BY.

关键词： Topology

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Quantum algorithm for Petz recovery channels and pretty good measurements

arXiv

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arXiv 2020年

作者： Gilyén, András Lloyd, Seth Marvian, Iman Quek, Yihui Wilde, Mark M. Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Simons Institute for the Theory of Computing BerkeleyCA94720 United States Department of Mechanical Engineering Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States Information Systems Laboratory Stanford University StanfordCA94305 United States Hearne Institute for Theoretical Physics Department of Physics and Astronomy Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Stanford Institute for Theoretical Physics Stanford University StanfordCA94305 United States

The Petz recovery channel plays an important role in quantum information science as an operation that approximately reverses the effect of a quantum channel. The pretty good measurement is a special case of the Petz recovery channel, and it allows for near-optimal state discrimination. A hurdle to the experimental realization of these vaunted theoretical tools is the lack of a systematic and efficient method to implement them. This paper sets out to rectify this lack: using the recently developed tools of quantum singular value transformation and oblivious amplitude amplification, we provide a quantum algorithm to implement the Petz recovery channel when given the ability to perform the channel that one wishes to reverse. Moreover, we prove that, in some sense, our quantum algorithm’s usage of the channel implementation cannot be improved by more than a quadratic factor. Our quantum algorithm also provides a procedure to perform pretty good measurements when given multiple copies of the states that one is trying to distinguish. Copyright © 2020, The Authors. All rights reserved.

关键词： Recovery

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RF chain reduction for MIMO systems: A hardware prototype

arXiv

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arXiv 2019年

作者： Gong, Tierui Shlezinger, Nir Ioushua, Shahar Stein Namer, Moshe Yang, Zhijia Eldar, Yonina C. State Key Lab of Robotics Key Lab of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110016 China University of Chinese Academy of Sciences Beijing100049 China Faculty of Mathematics and Computer Science Weizmann Institute of Science Rehovot Israel School of Electrical Engineering Tel Aviv University Tel Aviv Israel Faculty of Electrical Engineering Technion Haifa Israel

RF chain circuits play a major role in digital receiver architectures, allowing passband communication signals to be processed in baseband. When operating at high frequencies, these circuits tend to be costly. This increased cost imposes a major limitation on future multiple-input multiple-output (MIMO) communication technologies. A common approach to mitigate the increased cost is to utilize hybrid architectures, in which the received signal is combined in analog into a lower dimension, thus reducing the number of RF chains. In this work we present a hardware prototype implementing analog combining for RF chain reduction. The prototype consists of a specially designed configurable combining board as well as a dedicated experimental setup. Our hardware prototype allows to evaluate the effect of analog combining in MIMO systems using actual communication signals. The experimental study, which focuses on channel estimation accuracy in MIMO channels, demonstrates that using the proposed prototype, the achievable channel estimation performance is within a small gap in a statistical sense from that obtained using a costly receiver in which each antenna is connected to a dedicated RF chain. Furthermore, in the considered scenarios, this gap becomes negligible when the reduction rate, i.e., the ratio of the number of RF chains to the number of antennas, is above 62.5%. Copyright © 2019, The Authors. All rights reserved.

关键词： Channel estimation

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ANN based Interwell Connectivity Analysis in Cyber-Physical Petroleum systems

ANN based Interwell Connectivity Analysis in Cyber-Physical ...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Haibo Cheng Xiaoning Han Peng Zeng Haibin Yu Evgeny Osipov Valeriy Vyatkin Lab. of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Department of Computer Science Electrical and Space Engineering Luleå University of Technology Luleå Sweden

In cyber-physical petroleum systems (CPPS), accurate estimation of interwell connectivity is an important process to know reservoir properties comprehensively, determine water injection rate scientifically, and enhance oil recovery effectively for oil and gas (O&G) field. In this study, an artificial neural network (ANN) based analysis method is proposed to estimate interwell connectivity. The generated neural network is used to define the mapping function between production wells and surrounding injection wells based on the historical water injection and liquid production data. Finally, the proposed method is applied to a synthetic reservoir model. Experimental results show that ANN based approach is an efficient method for analyzing interwell connectivity.

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Saccadic predictive vision model with a fovea 18

Saccadic predictive vision model with a fovea

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2018 International Conference on Neuromorphic systems, ICONS 2018

作者： Hazoglou, Michael Hylton, Todd Contextual Robotics Institute University of California San Diego San DiegoCA United States Department of Electrical and Computer Engineering University of California San Diego San DiegoCA United States

ISBN: (纸本)9781450365444

We propose a model that emulates saccades, the rapid movements of the eye, called the Error Saccade Model, based on the prediction error of the Predictive Vision Model (PVM). The Error Saccade Model carries out movements of the model's field of view to regions with the highest prediction error. Comparisons of the Error Saccade Model on Predictive Vision Models with and without a fovea show that a fovea-like structure in the input level of the PVMimproves the Error Saccade Model's ability to pursue detailed objects in its view. We hypothesize that the improvement is due to poorer resolution in the periphery causing higher prediction error when an object passes, triggering a saccade to the next location. © 2018 Association for Computing Machinery.

关键词： Eye movements

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Robustness of DNA Strand Displacement systems⋆⁎

引用

IFAC-PapersOnLine 2018年第33期51卷 32-37页

作者： Nakakuki, Takashi Imura, Jun-ichi Kawamata, Ibuki Murata, Satoshi Department of Systems Design and Informatics School of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu IizukaFukuoka820-8502 Japan Department of Mechanical and Environmental Informatics Tokyo Institute of Technology 2-12-1-W8-1 O-okayama Meguro-ku Tokyo152-8552 Japan Department of Robotics Graduate School of Engineering Tohoku University 6-6-1 Aoba Aramaki-Aza Aoba-Ward SendaiMiyagi980-8579 Japan

How to construct a reliable deoxyribonucleic acid (DNA) circuit is one of the most important issues in the field of molecular programming and computing. Such a circuit frequently suffers from various kinds of unintended binding reactions on account of a lower specificity of the molecular interaction emerging from base complementarity between DNA strands, which results in low reliability of the molecular circuit. In this study, we propose a method to quantitatively evaluate the robustness of a DNA circuit created by DNA strand displacement reactions. The highlight of our method is representing the circuit system contaminated by unintended reactions by a standard form of a disturbed nonlinear system and evaluating the robustness with the L2 gain by solving the Hamilton–Jacobi inequality. © 2018

关键词： Nucleic acids Differential equations DNA Electric network analysis Large scale systems Nonlinear equations Substitution reactions Binding reactions Circuit systems Dna strand displacements DNA strands Molecular circuits Molecular programming Nonlinear circuit Uncertainty

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An Adaptive Strategy via Reinforcement Learning for the Prisoner＇s Dilemma Game

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 301-310页

作者： Lei Xue Changyin Sun Donald Wunsch Yingjiang Zhou Fang Yu Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University Nanjing 210096 China Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO 65409 USA College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China Institute of Logistics Science and Engineering Shanghai Maritime University Shanghai 210096 China IEEE

The iterated prisoner's dilemma(IPD) is an ideal model for analyzing interactions between agents in complex networks. It has attracted wide interest in the development of novel strategies since the success of tit-for-tat in Axelrod's tournament. This paper studies a new adaptive strategy of IPD in different complex networks, where agents can learn and adapt their strategies through reinforcement learning method. A temporal difference learning method is applied for designing the adaptive strategy to optimize the decision making process of the agents. Previous studies indicated that mutual cooperation is hard to emerge in the IPD. Therefore, three examples which based on square lattice network and scale-free network are provided to show two features of the adaptive strategy. First, the mutual cooperation can be achieved by the group with adaptive agents under scale-free network, and once evolution has converged mutual cooperation, it is unlikely to shift. Secondly, the adaptive strategy can earn a better payoff compared with other strategies in the square network. The analytical properties are discussed for verifying evolutionary stability of the adaptive strategy.

关键词： Complex network prisoner’s dilemma reinforcement learning temporal differences learning

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Anisotropic flocking control of distributed multi-agent systems using fluid abstraction

Anisotropic flocking control of distributed multi-agent syst...

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AIAA Information systems-AIAA Infotech at Aerospace, 2018

作者： Silic, Matthew Song, Zhuoyuan Mohseni, Kamran Department of Mechanical and Aerospace Engineering University of Florida GainesvilleFL32611 United States Electrical and Computer Engineering Department Institute for Networked Autonomous Systems University of Florida GainesvilleFL32611 United States

ISBN: (数字)9781624105272

ISBN: (纸本)9781624105272

This paper presents a multi-agent flocking scheme for real-time control of homogeneous unmanned aerial vehicles (UAVs) based on smoothed particle hydrodynamics. Swarm cohesion, collision avoidance, and velocity consensus are concurrently satisfied by characterizing the emerging macroscopic flock as a continuous fluid. Two vital implementation issues are addressed in particular including latency in information fusion and directionality of communication due to antenna patterns. Symmetric control forces are achieved by meticulous scheduling of inter-vehicle communication to sustain the motion stability of the flock. A generalized, anisotropic smoothing kernel that takes into account the relative position and attitude between agents is adopted to address potential flocking instability introduced by communication anisotropy due to the antenna radiation pattern. The feasibility of the technique is demonstrated experimentally using a single UAV avoiding a virtual obstacle. © 2018, American institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Directional patterns (antenna)

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A strategic review on sustainable approaches in municipal solid waste management andenergy recovery: Role of artificial intelligence,economic stability andlife cycle assessment

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Bioresource technology 2023年 379卷 129044页

作者： Rajendiran Naveenkumar Jayaraj Iyyappan Ravichandran Pravin Seifedine Kadry Jeehoon Han Raveendran Sindhu Mukesh Kumar Awasthi Samuel Lalthazuala Rokhum Gurunathan Baskar Biological Systems Engineering University of Wisconsin-Madison Madison WI 53706 United States Forest Products Laboratory USDA Forest Service Madison WI 53726 United States. Department of Biotechnology Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMATS) Thandalam Chennai 602107 India. Department of Biotechnology St. Joseph's College of Engineering Chennai 600119. India. Department of Applied Data Science Noroff University College Kristiansand Norway Artificial Intelligence Research Center (AIRC) Ajman University Ajman 346 United Arab Emirates Department of Electrical and Computer Engineering Lebanese American University Byblos Lebanon. Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea. Department of Food Technology TKM Institute of Technology Kollam Kerala India. College of Natural Resources and Environment Northwest A&F University Yangling Shaanxi Province 712100 China. Department of Chemistry National Institute of Technology Silchar 788010 Assam India. Department of Biotechnology St. Joseph's College of Engineering Chennai 600119. India Department of Applied Data Science Noroff University College Kristiansand Norway. Electronic address: basg2002@***.

The consumption of energy levels has increased in association with economic growth and concurrently increased the energy demand from renewable sources. The need under Sustainable Development Goals (SDG) intends to explore various technological advancements for the utilization of waste to energy. Municipal Solid Waste (MSW) has been reported as constructive feedstock to produce biofuels, biofuel carriers and biochemicals using energy-efficient technologies in risk freeways. The present review contemplates risk assessment and challenges in sorting and transportation of MSW and different aspects of conversion of MSW into energy are critically analysed. The circular bioeconomy of energy production strategies and management of waste are also analysed. The current scenario on MSW and its impacts on the environment are elucidated in conjunction with various policies and amendments equipped for the competent management of MSW in order to fabricate a sustained environment.

关键词： Circular bioeconomy Municipal Solid Waste Risk assessment Sustainable Waste Management

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