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High Order Mass-Lumping Finite Elements on Simplexes

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高等学校计算数学学报（英文版） 2017年第2期10卷 331-350页

作者： Tao Cui Wei Leng Deng Lin Shichao Ma Linbo Zhang State Key Laboratory of Scientific and Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of SciencesNo.55 East Zhongguancun Road Beijing 100190 China State Key Laboratory of Scientific and Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of SciencesNo.55 East Zhongguancun Road Beijing 100190 China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049 China

This paper is concerned with the construction of high order mass-lumping finite elements on simplexes and a program for computing mass-lumping finite elements on triangles and *** polynomial spaces for mass-lumping finite elements,as proposed in the literature,are presented and *** particular,the unisolvence problem of symmetric point-sets for the polynomial spaces used in mass-lumping elements is addressed,and an interesting property of the unisolvent symmetric point-sets is observed and *** its theoretical proof is still lacking,this property seems to be true in general,and it can greatly reduce the number of cases to consider in the computations of mass-lumping elements.A program for computing mass-lumping finite elements on triangles and tetrahedra,derived from the code for computing numerical quadrature rules presented in [7],is *** mass-lumping finite elements on triangles found using this program with higher orders,namely 7,8 and 9,than those available in the literature are reported.

关键词： Finite element mass-lumping simplex numerical quadrature multivariate polynomial interpolation unisolvence

Identification of the Electronic and Structural Dynamics of Catalytic Centers in Single-Fe-Atom Material

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SSRN

SSRN 2020年

作者： Li, Xuning Cao, Chang-Su Hung, Sung-Fu Lu, Ying-Rui Cai, Weizheng Rykov, Alexandre I. Miao, Shu Xi, Shibo Yang, Hongbin Hu, Zehua Wang, Junhu Zhao, Jiyong Alp, Esen Ercan Xu, Wei Chan, Ting-Shan Chen, Haoming Xiong, Qihua Xiao, Hai Huang, Yanqiang Li, Jun Zhang, Tao Liu, Bin School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive Singapore637459 Singapore State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China Department of Chemistry Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Tsinghua University Beijing100084 China Mössbauer Effect Data Center Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China Department of Chemistry National Taiwan University Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan Institute of Chemical and Engineering Sciences A*STAR Singapore627833 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Advanced Photon Source Argonne National Laboratory 9700 South Cass Avenue LemontIL60439 United States Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Department of Chemistry Southern University of Science and Technology Shenzhen518055 China

Single-atom catalysts (SACs) offer us new opportunities for capturing the reaction intermediates, identifying the active sites, and even monitoring the structural and electronic evolution of catalytic centers. However, the lack of model SACs and atomic-resolution operando spectroscopic techniques greatly limits our comprehension of the nature of catalysis. Herein, based on the newly designed model single-Fe-atom catalyst with well-controlled site density and coordination environment, we have explored the exact structure of catalytic centers and provided insights into a novel spin-crossover-involved mechanism for oxygen reduction reaction (ORR) using operando Raman, X-ray absorption spectroscopies, as well as the newly developed operando 57Fe Mössbauer technique. Combining with theoretical studies, the single-Fe-atom site of N-FeN4C10 moiety, with preferential reaction to O2 near the onset potential, is shown as a more active site for ORR. Moreover, the potential-relevant dynamic cycles of both the geometric structure and electronic configuration of reactive single-Fe-atom moieties are evidenced via directly capturing the peroxido (*O2-) and hydroxyl (*OH-) intermediates under in-situ ORR conditions. Our results provide proof-of-concept for the integration of operando techniques and SACs, which directs the way towards the electronic-level insight into catalytic centers and underlying reaction mechanism. © 2020, The Authors. All rights reserved.

关键词： Electrolytic reduction

HPC AI500: A benchmark suite for HPC AI systems

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arXiv 2019年

作者： Jiang, Zihan Gao, Wanling Wang, Lei Xiong, Xingwang Zhang, Yuchen Wen, Xu Luo, Chunjie Ye, Hainan Lu, Xiaoyi Zhang, Yunquan Feng, Shengzhong Li, Kenli Xu, Weijia Zhan, Jianfeng State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences University of Chinese Academy of Sciences China BenchCouncil [International Open Benchmarking Council Beijing Academy of Frontier Sciences and Technology State University of New York Buffalo United States Department of Computer Science and Engineering Ohio State University National Supercomputing Center Shenzhen China National Supercomputing Center Changsha China National Supercomputing Center Jinan China Texas Advanced Computing Center Texas University Austin United States

In recent years, with the trend of applying deep learning (DL) in high performance scientific computing, the unique characteristics of emerging DL workloads in HPC raise great challenges in designing, implementing HPC AI systems. The community needs a new yard stick for evaluating the future HPC systems. In this paper, we propose HPC AI500 - a benchmark suite for evaluating HPC systems that running scientific DL workloads. Covering the most representative scientific fields, each workload from HPC AI500 is based on real-world scientific DL applications. Currently, we choose 14 scientific DL benchmarks from perspectives of application scenarios, data sets, and software stack. We propose a set of metrics for comprehensively evaluating the HPC AI systems, considering both accuracy, performance as well as power and cost. We provide a scalable reference implementation of HPC AI500. The specification and source code are publicly available from http://***/HPCAI500/***. Meanwhile, the AI benchmark suites for datacenter, IoT, Edge are also released on the BenchCouncil web site. Copyright © 2019, The Authors. All rights reserved.

关键词： Benchmarking

Fine-grained event categorization with heterogeneous graph convolutional networks

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arXiv 2019年

作者： Peng, Hao Li, Jianxin Gong, Qiran Song, Yangqiu Ning, Yuanxing Lai, Kunfeng Yu, Philip S. Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University State Key Laboratory of Software Development Environment Beihang University Department of Computer Science and Engineering Hong Kong University of Science and Technology Platform and Content Group Tencent Institute for Data Science Tsinghua University Department of Computer Science University of Illinois Chicago United States

Events are happening in real-world and real-time, which can be planned and organized occasions involving multiple people and objects. Social media platforms publish a lot of text messages containing public events with comprehensive topics. However, mining social events is challenging due to the heterogeneous event elements in texts and explicit and implicit social network structures. In this paper, we design an event meta-schema to characterize the semantic relatedness of social events and build an event-based heterogeneous information network (HIN) integrating information from external knowledge base, and propose a novel Pairwise Popularity Graph Convolutional Network (PP-GCN) based fine-grained social event categorization model. We propose a Knowledgeable meta-paths Instances based social Event Similarity (KIES) between events and build a weighted adjacent matrix as input to the PP-GCN model. Comprehensive experiments on real data collections are conducted to compare various social event detection and clustering tasks. Experimental results demonstrate that our proposed framework outperforms other alternative social event categorization techniques. Copyright © 2019, The Authors. All rights reserved.

关键词： Information services

Exotic Cooper pairing in multiorbital models of Sr2RuO4

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Physical Review B 2019年第13期100卷 134506-134506页

作者： Wen Huang Yi Zhou Hong Yao Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Institute for Advanced Study Tsinghua University Beijing 100084 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518005 China Beijing National Laboratory for Condensed Matter Physics & Institute of Physics Chinese Academy of Sciences Beijing 100190 China Kavli Institute for Theoretical Sciences & CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Low Dimensional Quantum Physics Tsinghua University Beijing 100084 China

The unconventional superconductivity in Sr2RuO4 continues to defy a unified interpretation. In this paper, we focus on some novel aspects of its superconducting pairing by exploiting the orbital degree of freedom in this material. The multiorbital nature, combined with the symmetry of the orbitals involved, leads to a plethora of exotic Cooper pairings not accessible in single-orbital systems. Essential physics is illustrated first using a two-orbital model with dxz and dyz orbitals. We classify the gap functions according to the underlying lattice symmetries, analyze the effective theories of a few representative pairings, and make connections to Sr2RuO4 in the course. In particular, we show how spin-orbit coupling may entangle spin-triplet and spin-singlet pairings. For completeness, the classification is generalized to the three-orbital model involving the dxy orbital as well. The orbital-basis approach distinguishes from the itinerant-band description for Sr2RuO4 and hence offers an alternative perspective to investigate its enigmatic superconducting state.

关键词： Pairing mechanisms Spin-singlet pairing Spin-triplet pairing Superconducting order parameter Superconductivity Topological materials Topological phases of matter Topological superconductors

A new aggregate signature scheme in cryptographic currency

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International Journal of Performability engineering 2017年第5期13卷 754-762页

作者： Yuan, Chao Xu, Mixue Si, Xueming State Key Laboratory of Mathematical Engineering and Advanced Computing Information Engineering University Zhengzhou450001 China

With the rise of Bitcoin, cryptographic currencies have attracted more and more attention. Subsequently, other cryptographic currencies were gradually created, such as Zcash, Moreno, Dash and so on. In cryptographic currency, privacy preserving and expansion are two key technical points. In terms of privacy preserving, more effective solutions were proposed in Zcach, Moreno, Dash and other cryptographic currencies systems, in which ring signature, zero knowledge proof and other cryptographic techniques played important roles. But these schemes mainly considered protecting the addresses of both sides of the transaction. In terms of expansion, lightning network and other projects also give solutions. But most of these projects will bring other problems. In this paper, a signature scheme based on the aggregate signature and the elliptic curve algorithm is proposed to hide the transaction value of a single sender and receiver in the transactions which contain multiple inputs and outputs. This signature scheme achieves the purpose of privacy preserving from the transaction value. Further, the correctness proof and security analysis are given in this paper. In addition to that, another signature scheme that combines aggregation signature with bilinear ring signature is proposed. This aggregate ring signature scheme gives another attempt to solve the problem of expansion in the cryptographic currency system only using cryptographic technologies. At the same time, the sender's addresses can be hidden. Similarly, we also confirmed the correctness of this signature scheme.

关键词： Expansion

A malware detection system based on intermediate language

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A malware detection system based on intermediate language

International Conference on Systems and Informatics (ICSAI)

作者： Binglin Zhao Jin Han Xi Meng State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

Malware remains a serious problem for economic corporations, government agencies, and individuals. With the evolution of malware, the malware detection method based on signature, reputation or anomaly show the lack of detection ability. In this paper, we proposed a novel malware detection system, which use the feature extract from intermediate representation and utilizes multiple evaluation methods to detect the malware. We extract the feature from intermediate representation with fine-grained that retain the functional sequence of malware. Then, we use LSTM (Long Sort Term Memory) to learn the pattern from the training set and build a detection system that contain many antivirus software's results to detect malware and classify it. Our approach is evaluated on more than 300,000 samples. Experimental results show that our system can effectively detect unknown malware and classify it.

关键词： Malware Feature extraction Training Classification algorithms Flow graphs Androids

Heavy meson lightcone distribution amplitudes from Lattice QCD

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arXiv 2025年

作者： Han, Xue-Ying Hua, Jun Lü, Cai-Dian Schäfer, Andreas Su, Yushan Wang, Wei Xu, Ji Yang, Yibo Zhang, Jian-Hui Zhang, Qi-An Zhao, Shuai Ji, Xiangdong Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Maryland Center for Fundamental Physics Department of Physics University of Maryland 4296 Stadium Dr. College ParkMD20742 United States Institut für Theoretische Physik University Regensburg RegensburgD-93040 Germany School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institute of Modern Physics Chinese Academy of Sciences Guangdong Province Huizhou516000 China School of Nuclear Science and Technology Lanzhou University Lanzhou730000 China School of Physics and Microelectronics Zhengzhou University Henan Zhengzhou450001 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study UCAS Hangzhou310024 China International Centre for Theoretical Physics Asia-Pacific Hangzhou Beijing China School of Science and Engineering The Chinese University of Hong Kong Shenzhen518172 China School of Physics Beihang University Beijing102206 China School of Science Tianjin University Tianjin300072 China

Lightcone distribution amplitudes (LCDAs) within the framework of heavy quark effective theory (HQET) play a crucial role in the theoretical description of weak decays of heavy bottom mesons. However, the first-principle determination of HQET LCDAs faces significant theoretical challenges. In this presentation, we introduce a practical approach to address these obstacles. This makes sequential use of effective field theories. Leveraging the newly-generated lattice ensembles, we present a pioneering lattice calculation, offering new insights into LCDAs for heavy mesons. Additionally, we discuss the impact of these results on the heavy-to-light form factors and briefly give potential future directions in this field. © 2025, CC BY.

关键词： Lattice theory

Quantum man-in-the-middle attack on the calibration process of quantum key distribution

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arXiv 2018年

作者： Fei, Yang-Yang Meng, Xiang-Dong Gao, Ming Wang, Hong Ma, Zhi Gao, Ming State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan450001 China Cas Ctr. for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China

Quantum key distribution (QKD) protocol has been proved to provide unconditionally secure key between two remote legiti-mate users in theory. key distribution signals are transmitted in a quantum channel which is established by the calibration process to meet the requirement of high count rate and low error rate. All QKD security proofs implicitly assume that the quantum channel has been established securely. However, the eavesdropper may attack the calibration process to break the security assumption of QKD and provide precondition to steal information about the final key successfully. Inspired by N. Jain et al., Phys. Rev. Lett.107,110501(2011), we reveal the security risk of the calibration process of a passive-basis-choice BB84 QKD system by launching a quantumman-in-the-middle attack which intercepts all calibration signals and resends faked ones. Large temporal bit-dependent or basis-dependent detector efficiency mismatch can be induced. Then we propose a basis-dependent detector efficiency mismatch (BEM) based faked states attack on a single photon BB84 QKD to stress the threat of BEM. Moreover, the security of single photon QKD systems with BEM is studied simply and intuitively. Two effective countermeasures are suggested to remove the general security risk of the calibration process. Copyright © 2018, The Authors. All rights reserved.

关键词： Efficiency