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Proceedings of the 2019 The 2nd International Conference on Robotics, Control and Automation Engineering

作者： Linlin Du Yuhong Huang Yuhua Tang Da Huang The State Key Laboratory of High Performance Computing National University of Defense Technology Changsha Hunan China College of Computer National University of Defense Technology Changsha Hunan China The State Key Laboratory of High Performance Computing National University of Defense Technology Changsha Hunan China

ISBN: (纸本)9781450376228

Real-time control strategy development remains challenging in the field of controlling multi-robot system. Due to frequent and massive interactions among robots, it is hard to implement a real-time control strategy in the multi-robot system. This phenomenon further limits the development of multi-robot application which adopts the real-time control strategy. To deal with above challenges, this paper proposes a decentralized control policy for multi-robot to avoid collision in an unknown environment. This policy adopts reward value to measure robots' motion and states. With reward value, robots can determine which neighbor robot to communicate with and to learn from, which decreases the interaction cost incurred in the multi-robot system. By the reward, the control strategy of each robot can be optimized through learning from its neighbors. Comparative experiments are conducted in a simulator to evaluate the effectiveness of our policy.

关键词： Swarm robotics Self-organization Multi-robot systems

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Coherent ground-state transport of neutral atoms

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Physical Review A 2022年第3期105卷 032417-032417页

作者： X. X. Li J. B. You X. Q. Shao Weibin Li Center for Quantum Sciences and School of Physics Northeast Normal University Changchun 130024 China Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way Connexis Singapore 138632 Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China School of Physics and Astronomy The University of Nottingham Nottingham NG7 2RD United Kingdom

Quantum state transport is an important way to study the energy or information flow. By combining the unconventional Rydberg pumping mechanism and the diagonal form of van der Waals interactions, we construct a theoretical model via second-order perturbation theory to realize a long-range coherent transport inside the ground-state manifold of neutral atoms systems. With the adjustment of the Rabi frequencies and the interatomic distance, this model can be used to simulate various single-body physics phenomena such as a Heisenberg XX spin chain restricted in the single-excitation manifold, coherently perfect quantum state transfer, the parameter-adjustable Su-Schrieffer-Heeger model, and chiral motion of atomic excitation in a triangle by varying the geometrical arrangement of the three atoms, which effectively avoids the influence of atomic spontaneous emission at the same time. Moreover, the influence of atomic position fluctuation on the fidelity of quantum state transmission is discussed in detail, and the corresponding numerical results show that our work provides a robust and easily implemented scheme for quantum state transport with neutral atoms.

关键词： Quantum information processing Quantum simulation Rydberg atoms & molecules Electric moment Nonperturbative methods Perturbative methods Quantum Monte Carlo

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Interactive key-Value Memory-augmented Attention for Image Paragraph Captioning 28

Interactive Key-Value Memory-augmented Attention for Image P...

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28th International Conference on Computational Linguistics, COLING 2020

作者： Xu, Chunpu Li, Yu Li, Chengming Ao, Xiang Yang, Min Tian, Jinwen Shenzhen Key Laboratory for High Performance Data Mining Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China Huazhong University of Science and Technology China Shanghai Jiao Tong University China Institute of Computing Technology Chinese Academy of Sciences China University of Chinese Academy of Sciences China

ISBN: (纸本)9781952148279

Image paragraph captioning (IPC) aims to generate a fine-grained paragraph to describe the visual content of an image. Significant progress has been made by deep neural networks, in which the attention mechanism plays an essential role. However, conventional attention mechanisms tend to ignore the past alignment information, which often results in problems of repetitive captioning and incomplete captioning. In this paper, we propose an Interactive key-value Memory-augmented Attention model for image Paragraph captioning (IMAP) to keep track of the attention history (salient objects coverage information) along with the update-chain of the decoder state and therefore avoid generating repetitive or incomplete image descriptions. In addition, we employ an adaptive attention mechanism to realize adaptive alignment from image regions to caption words, where an image region can be mapped to an arbitrary number of caption words while a caption word can also attend to an arbitrary number of image regions. Extensive experiments on a benchmark dataset (i.e., Stanford) demonstrate the effectiveness of our IMAP model. © 2020 COLING 2020 - 28th International Conference on Computational Linguistics, Proceedings of the Conference. All rights reserved.

关键词： Deep neural networks

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Cascade of the delocalization transition in a non-Hermitian interpolating Aubry-André-Fibonacci chain

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Physical Review B 2021年第1期104卷 014202-014202页

作者： Liang-Jun Zhai Guang-Yao Huang Shuai Yin The School of Mathematics and Physics Jiangsu University of Technology Changzhou 213001 China Department of Physics Nanjing University Nanjing 210093 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China School of Physics Sun Yat-Sen University Guangzhou 510275 China

In this paper, the interplay of the non-Herimiticity and the cascade of delocalization transition in a quasiperiodic chain are studied. The study is applied in the non-Hermitian interpolating Aubry-André-Fibonacci (IAAF) model, which combines the non-Hermitian Aubry-André (AA) model and the non-Hermitian Fibonacci model through a varying parameter, and the non-Hermiticity in this model is introduced by nonreciprocal hopping. In the non-Hermitian AA limit, the system undergoes a delocalization transition by tuning the potential strength. At the critical point, the spatial distribution of the critical state shows a self-similar structure with the relative distance between the peaks being the Fibonacci sequence, and the finite-size scaling of the inverse participation ratios (IPRs) of the critical ground state with lattice size L shows that IPRg∝L−0.1189. In the non-Hermitian Fibonacci limit, we find that the system is always in the extended phase. Along the continuous deformation from the non-Hermitian AA model into the non-Hermitian Fibonacci model in the IAAF model, the cascade of the delocalization transition is found, but only a few plateaux appear. Moreover, the self-similar structure of spatial distribution for the critical modes along the cascade transition is also found. In addition, we find that the delocalization transition and the real-complex transition for the excited states happen at almost the same parameter. Our results show that the non-Hermiticity provides an additional knob to control the cascade of the delocalization transition besides the on-site potential.

关键词： Anderson localization Critical phenomena Localization Phase transitions Quantum phase transitions

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Human-cyber-physical systems:concepts,challenges,and research opportunities

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Frontiers of Information technology & Electronic Engineering 2020年第11期21卷 1535-1553页

作者： Zhiming LIU Ji WANG RISE-Centre for Research and Innovation in Software Engineering School of Computer and Information ScienceSouthwest UniversityChongqing 400715China State Key Laboratory for High Performance Computing School of ComputerNational University of Defense TechnologyChangsha 410073China

In this perspective article,we first recall the historic background of human-cyber-physical systems(HCPSs),and then introduce and clarify important *** discuss the key challenges in establishing the scientific foundation from a system engineering point of view,including(1)complex heterogeneity,(2)lack of appropriate abstractions,(3)dynamic black-box integration of heterogeneous systems,(4)complex requirements for functionalities,performance,and quality of services,and(5)design,implementation,and maintenance of HCPS to meet *** we propose four research directions to tackle the challenges,including(1)abstractions and computational theory of HCPS,(2)theories and methods of HCPS architecture modelling,(3)specification and verification of model properties,and(4)software-defined *** article also serves as the editorial of this special section on cyber-physical systems and summarises the four articles included in this special section.

关键词： Abstractions Architecture modelling Evolution Software-defined technology

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Segment-based Cross-domain Localization between Aerial and Ground Robots

Segment-based Cross-domain Localization between Aerial and G...

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Chinese Automation Congress (CAC)

作者： Jiaan Wu Shaowu Yang Yongjun Zhang Institute for Quantum Information & State Key Laboratory of High Performance Computing National University of Defense Technology Changsha China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

Cross-domain localization is the foundation and key link for collaborations of unmanned aerial vehicles (UAVs) and unmanned ground vehicles (UGVs). A major challenge of this problem is the extremely large difference in view-points of aerial and ground robots. In this work, we present a segment-based cross-domain localization solution that accurately calculates the pose of a UGV in the reference map generated by a UAV. Especially, in scenarios with few small-size structures, our method exploits the common information of large structures in aerial and ground view-points to match, which leads to a satisfactory recall of place recognition. Additionally, we build a large scale outdoor simulation urban environment at high fidelity and present three accurate synthetic benchmark datasets with easy, medium and difficult levels, to quantitatively evaluate the performance of our solution. Experimental results demonstrate that our method achieves notable better performance than the baseline method SegMap. Our implementation is publicly available at https://***/5john/AirGroundSegMap.

关键词： Three-dimensional displays Location awareness Robots Task analysis Unmanned aerial vehicles Semantics Pipelines

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A lightweight collective communication based parallel algorithm for the greedy point selection in RBF mesh deformation 21

A lightweight collective communication based parallel algori...

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21st IEEE International Conference on high performance computing and Communications, 17th IEEE International Conference on Smart City and 5th IEEE International Conference on Data Science and Systems, HPCC/SmartCity/DSS 2019

作者： Zhao, Ran Li, Chao Guo, Xiaowei Fan, Sijiang Wang, Yi Liu, Yi Yang, Canqun State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781728120584

The greedy algorithm is one of the most efficient point selection method utilized by radial basis function (RBF) based mesh deformation in computational fluid dynamic (CFD). To improve the computational efficiency of the greedy process, several parallelization methods are developed in the past few years for the data reduction. However, these methods produce additional time cost because of the communication redundancy which can restrict the parallel scale. This paper proposes a new parallel strategy for the greedy selection in which a lightweight collective communication is adopted to replace the point-to-point communication. In addition, this strategy emphasizes that all the parallel processes operate under the same computational complexity as much as possible to reinforce the load balancing. Specifically, a three-dimension undulating fish model is utilized to validate the lightweight collective communication strategy. And finally, the proposed one gets up to 20% time performance improvement on average compared with two classic parallel methods. © 2019 IEEE.

关键词： Data reduction

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APOAL: An adaptive parallel optimization algorithm for LBM fluid simulations 21

APOAL: An adaptive parallel optimization algorithm for LBM f...

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作者： Fan, Sijiang Guo, Xiaowei Li, Chao Zhao, Ran Wang, Yi Liu, Yi Yang, Canqun State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781728120584

As a novel approach for fluid simulations, the lattice boltzmann method (LBM) is essentially more suitable for large scale parallel computing compared to the traditional macroscopic methods. However, the default lattice block size used in the open source LBM solver seriously affects the performance. In this paper, we propose an adaptive parallel optimization algorithm (named APOAL) to automatically find a local optimal value of the block size for different hardware platform, so that the time cost of large-scale parallel LBM simulations could be significantly reduced. The experiment results show that the performance of APOAL outperforms that of default block size especially in large scale simulations. And in our cluster experiments with more than 1000 cores, the APOAL-optimized LBM solver shows up to 6.23× speedup (4.84× on average) with respect to the original solver. © 2019 IEEE.

关键词： Kinetic theory

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Origin of ultrafast growth of monolayer WSe_(2) via chemical vapor deposition

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npj Computational Materials 2019年第1期5卷 907-914页

作者： Shuai Chen Junfeng Gao Bharathi MSrinivasan Gang Zhang Viacheslav Sorkin Ramanarayan Hariharaputran Yong-Wei Zhang Institute of High Performance Computing A*STARSingapore 138632Singapore Key Laboratory of Materials Modification by Laser Ion and Electron BeamsDalian University of TechnologyMinistry of EducationDalian 116024People’s Republic of China

The ultrafast growth of large-area,high-quality WSe2 domains with a compact triangular morphology has recently been achieved on a gold substrate via chemical vapor ***,the underlying mechanism responsible for ultrafast growth remains ***,we first analyze growth processes and identify two possible pathways that might achieve ultrafast growth:Path 1,fast edge attachment and ultrafast edge diffusion;Path 2,fast kink nucleation and ultrafast kink *** perform kinetic Monte Carlo simulations and first-principles calculations to assess the viability of these two paths,finding that Path 1 is not viable due to the high edge diffusion barrier calculated from first-principles ***,Path 2 reproduces all the experimental growth features(domain morphology,domain orientation,and growth rate),and the associated energetic data are consistent with first-principles *** present work unveils the underlying mechanism for the ultrafast growth of WSe2,and may provide a new route for the ultrafast growth of other two-dimensional materials.

关键词： deposition diffusion mechanism

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Coherence fraction in Grover's search algorithm

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Physical Review A 2024年第6期110卷 062429-062429页

作者： Si-Qi Zhou Hai Jin Jin-Min Liang Shao-Ming Fei Yunlong Xiao Zhihao Ma School of Mathematical Sciences MOE-LSC Shanghai Jiao Tong University Shanghai 200240 China Shanghai Seres Information Technology Co. Ltd Shanghai 200040 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China State Key Laboratory for Mesoscopic Physics School of Physics Frontiers Science Center for Nano-Optoelectronics Peking University Beijing 100871 China School of Mathematical Sciences Capital Normal University Beijing 100048 China Max Planck Institute for Mathematics in the Sciences - 04103 Leipzig Germany Quantum Innovation Centre (Q.InC) Agency for Science Technology and Research (ASTAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Republic of Singapore Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (ASTAR) 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Republic of Singapore

The question of which resources drive the advantages in quantum algorithms has long been a fundamental challenge. While entanglement and coherence are critical to many quantum algorithms, our results indicate that they do not fully explain the quantum advantage achieved by the Grover search algorithm. By introducing a generalized Grover search algorithm, we demonstrate that the success probability depends not only on the querying number of oracles but also on the coherence fraction, which quantifies the fidelity between an arbitrary initial quantum state and the equal superposition state. Additionally, we explore the role of the coherence fraction in the quantum minimization algorithm, which offers a framework for solving complex problems in quantum machine learning. These findings offer insights into the origins of quantum advantage and open pathways for the development of new quantum algorithms.

关键词： Quantum entanglement

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