检索结果-内蒙古大学图书馆

arXiv 2017年

作者： Bollt, Erik M. Li, Qianxiao Dietrich, Felix Kevrekidis, Ioannis Department of Mathematics Department of Electrical and Computer Engineering Department of Physics Clarkson University PotsdamNY13699 United States Institute of High Performance Computing Agency for Science Technology and Research Singapore138632 Singapore Department of Chemical and Biomolecular Engineering Department of Applied Mathematics and Statistics Johns Hopkins University and JHMI

Matching dynamical systems, through different forms of conjugacies and equivalences, has long been a fundamental concept, and a powerful tool, in the study and classification of nonlinear dynamic behavior (e.g. through normal forms). In this paper we will argue that the use of the Koopman operator and its spectrum is particularly well suited for this endeavor, both in theory, but also especially in view of recent data-driven algorithm developments. We believe, and document through illustrative examples, that this can nontrivially extend the use and applicability of the Koopman spectral theoretical and computational machinery beyond modeling and prediction, towards what can be considered as a systematic discovery of "Cole-Hopf-type" transformations for dynamics. Copyright © 2017, The Authors. All rights reserved.

关键词： Dynamical systems

来源：评论

学校读者我要写书评

暂无评论

Implementation vulnerabilities in general quantum cryptography

arXiv

引用

arXiv 2018年

作者： Huang, Anqi Barz, Stefanie Andersson, Erika Makarov, Vadim Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Institute for Functional Matter and Quantum Technologies University of Stuttgart Stuttgart70569 Germany Center for Integrated Quantum Science and Technology University of Stuttgart Iqst Stuttgart70569 Germany Institute of Photonics and Quantum Sciences Heriot-Watt University EdinburghEH14 4AS United Kingdom Russian Quantum Center and Misis University Moscow Russia Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada

Quantum cryptography is information-theoretically secure owing to its solid basis in quantum mechanics. However, generally, initial implementations with practical imperfections might open loopholes, allowing an eavesdropper to compromise the security of a quantum cryptographic system. This has been shown to happen for quantum key distribution (QKD). Here we apply experience from implementation security of QKD to several other quantum cryptographic primitives. We survey quantum digital signatures, quantum secret sharing, source-independent quantum random number generation, quantum secure direct communication, and blind quantum computing. We propose how the eavesdropper could in principle exploit the loopholes to violate assumptions in these protocols, breaking their security properties. Applicable countermeasures are also discussed. It is important to consider potential implementation security issues early in protocol design, to shorten the path to future applications. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

来源：评论

学校读者我要写书评

暂无评论

Efficient reconstruction of CASCI-type wave functions for a DMRG state using quantum information theory and genetic algorithm

arXiv

引用

arXiv 2017年

作者： Luo, Z. Ma, Y. Liu, C. Ma1, H. Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China Department of High Performance Computing Technology and Application Development Computer Network Information Center Chinese Academy of Sciences Beijing100190 China

We improve the methodology to construct a complete active space-configuration interaction (CAS-CI) expansion for density-matrix renormalization group (DMRG) wave function using matrix-product state representation, nspired by the sampling-reconstructed CAS [SR-CAS, Boguslawski et al, J. Chem. Phys. 2011, 134, 224101] algorithm. In our scheme, a genetic algorithm, n which the "crossover" and "mutation" process can be optimized based on quantum information theory, s employed when reconstructing the CASCI-type wave function in the Hilbert space. Test analysis results for the ground and excited state wave functions of conjugated molecules and transition metal compounds illustrate that our scheme is very efficient for searching the most important CI expansions in large active spaces. Copyright © 2017, The Authors. All rights reserved.

关键词： Wave functions

来源：评论

学校读者我要写书评

暂无评论

A graph-based patent evolution model using summarization and patent relationships 29

A graph-based patent evolution model using summarization and...

引用

29th International Conference on computer Applications in Industry and engineering, CAINE 2016

作者： Chen, Lun-Chi Chen, Yu-Chiuan Huang, Jyun-Yao Liao, I.-En National Center for High-performance Computing National Applied Research Laboratories Taichung Taiwan Department of Computer Science and Engineering National Chung-Hsing University Taichung Taiwan

ISBN: (纸本)9781943436040

The number of granted patents is rapidly growing because of strong business competition. For decision-makers in enterprises, it is necessary to understand the patent evolutions as soon as possible. Thus, how to discover the patent evolutions from patent databases and generate a vivid presentation on them are becoming important. In this study, a patent relationship discovery method was employed to organize the topics of patents in temporal order. A new multi-document summarization method based on graph algorithm was proposed to conduct a summarization analysis for automatically extracting key-phrases from several granted patent documents. The proposed methodology was evaluated using the dataset Wireless Communication Network (encoded with H04W) from granted patents under section G (physics) of United States Patent and Trademark Office (USPTO). The experimental results show that the proposed methodology can obtain more effective results than other methods for extracting keywords and helping users discovering critical techniques. Copyright ISCA, CAINE 2016.

关键词： Decision making

来源：评论

学校读者我要写书评

暂无评论

A Graphene‐Supported Single‐Atom FeN5Catalytic Site for Efficient Electrochemical CO2Reduction

引用

Angewandte Chemie 2019年第42期131卷

作者： Huinian Zhang Jing Li Shibo Xi Yonghua Du Xiao Hai Junying Wang Haomin Xu Gang Wu Jia Zhang Jiong Lu Junzhong Wang Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University Hefei 230601 P. R. China CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore Institute of Chemical and Engineering Sciences Pesek Road Jurong Island 627833 Singapore Singapore Dalian National Laboratory for Clean Energy Dalian 116023 China Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way #16-16 Connexis S138632 Singapore

Electrochemical conversion of CO 2 into valued products is one of the most important issues but remains a great challenge in chemistry. Herein, we report a novel synthetic approach involving prolonged thermal pyrolysis of hemin and melamine molecules on graphene for the fabrication of a robust and efficient single‐iron‐atom electrocatalyst for electrochemical CO 2 reduction. The single‐atom catalyst exhibits high Faradaic efficiency (ca. 97.0 %) for CO production at a low overpotential of 0.35 V, outperforming all Fe‐N‐C‐based catalysts. The remarkable performance for CO 2 ‐to‐CO conversion can be attributed to the presence of highly efficient singly dispersed FeN 5 active sites supported on N‐doped graphene with an additional axial ligand coordinated to FeN 4 . DFT calculations revealed that the axial pyrrolic nitrogen ligand of the FeN 5 site further depletes the electron density of Fe 3d orbitals and thus reduces the Fe–CO π back‐donation, thus enabling the rapid desorption of CO and high selectivity for CO production.

关键词： CO-Entwicklung CO2-Reduktion Einzelatomkatalysatoren Eisen Elektrokatalyse

来源：评论

学校读者我要写书评

暂无评论

JOINT DETECTION AND CLINICAL SCORE PREDICTION IN PARKINSON'S DISEASE VIA MULTI-MODAL SPARSE LEARNING

JOINT DETECTION AND CLINICAL SCORE PREDICTION IN PARKINSON'S...

引用

International Symposium on Biomedical Imaging

作者： Haijun Lei Jian Zhang Zhang Yang Ee-leng Tan Baiying Lei Qiuming Luo College of Computer Science and Software Engineering Shenzhen University Key Laboratory of Service Computing and Applications Guangdong Province Key Laboratory of Popular High Performance Computers School of Information Engineering Shenzhen University School of Electric and Electronic Engineering Nanyang Technological University School of Biomedical Engineering Shenzhen University Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical Ultrasound

ISBN: (纸本)9781509011735

In this study, a novel feature selection framework is proposed to simultaneously perform classification and clinical scores prediction of Parkinson's disease (PD) via multi-modal neuroimaging data. Specifically, a new feature selection model is devised to capture discriminative features to train support vector regression model for clinical scores (e.g., sleep scores and olfactory scores) prediction and support vector classification model for class label identification. Our method is evaluated on a public dataset of 208 subjects including 56 normal controls (NC), 123 PD and 29 scans without evidence of dopamine deficit (SWEDD) via a 10-fold cross-validation method. The experimental results demonstrate that multimodal data can effectively improve the performance in disease status identification and clinical scores prediction compared to one single modality. Our proposed method also outperforms the related methods.

关键词： Parkinson's disease Feature selection Classification Prediction Multi-modal data

来源：评论

学校读者我要写书评

暂无评论

Parallel erasure coding: Exploring task parallelism in erasure coding for enhanced bandwidth and energy efficiency 11

Parallel erasure coding: Exploring task parallelism in erasu...

引用

11th IEEE International Conference on Networking Architecture and Storage, NAS 2016

作者： Chen, Hsing-Bung Fu, Song High Performance Computing-Design Group Los Alamos National Laboratory Los AlamosNM87545 United States Department of Computer Science and Engineering University of North Texas DentonTX76203 United States

ISBN: (纸本)9781509033157

Very large data sets within the range of megabytes to terabytes generated daily from checkpoint-and- restart processes are seen in today's scientific simulations. Reliability and durability are two important factors to build an archive storage system. Erasure code based object storage systems are becoming popular choices for archive storage systems due to cost-effective storage space saving schemes and higher fault-resilience capabilities. Both erasure code encoding and decoding procedures involve heavy array, matrix, and table-lookup compute intensive operations. Current solutions of the erasure coding process are based on single process approach which is not capable of processing very large data sets efficient and effectively. In this paper, we address the bottleneck problem of single process erasure encoding by leveraging task parallelism offered by multi-core computers. We add parallel processing capability to the erasure coding process. More specifically, we develop a parallel erasure coding software, called parEC. It explores the MPI run time parallel I/O environment and integrates data placement process for distributing encoded data blocks to destination storage devices. We evaluate the performance of parEC in terms of both encoding throughput and energy efficiency. We also compare the performance of two task scheduling algorithms for parEC. Our experimental results show parEC can significantly reduce the encoding time (i.e., by 74.06%-96.86%) and energy consumption (i.e., by 73.57%-96.86%), and Demand-based Workload Assignment (DBWA) algorithm can a high system utilization (i.e., 95.23%). © 2016 IEEE.

关键词： Energy efficiency

来源：评论

学校读者我要写书评

暂无评论

Stateful logic circuit and material using memristors

Stateful logic circuit and material using memristors

引用

IEEE Electron Devices Technology and Manufacturing Conference (EDTM)

作者： Nuo Xu Xinglong Shao Kyung Jean Yoon Hae Jin Kim Kyung Min Kim Cheol Seong Hwang State Key Laboratory of High Performance Computing National University of Defense Technology Changsha Hunan China Department of Materials Science and Engineering Seoul National University Seoul South Korea Hewlett Packard Enterprise Hewlett Packard Labs Palo Alto USA

By combining the functionalities of Boolean gates and non-volatile memory, stateful logic may enable significant savings in time and energy for computational processes where available power source is limited. In this talk, fundamental principles of stateful logic will be described first, and circuit level implementation of it using recently explored bi-functional memristor (coexistence of unipolar and bipolar switching), and conventional bipolar and complementary resistance switching devices are presented.

关键词： Resistance Logic gates Memristors Switches Central Processing Unit Electron devices Manufacturing

来源：评论

学校读者我要写书评

暂无评论

Ultralight vector dark matter search using data from the KAGRA O3GK run

引用

Physical Review D 2024年第4期110卷 042001页

作者： A. G. Abac R. Abbott H. Abe I. Abouelfettouh F. Acernese K. Ackley C. Adamcewicz S. Adhicary N. Adhikari R. X. Adhikari V. K. Adkins V. B. Adya C. Affeldt D. Agarwal M. Agathos O. D. Aguiar I. Aguilar L. Aiello A. Ain P. Ajith T. Akutsu S. Albanesi R. A. Alfaidi A. Al-Jodah C. Alléné A. Allocca S. Al-Shammari P. A. Altin S. Alvarez-Lopez A. Amato L. Amez-Droz A. Amorosi C. Amra S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Andia M. Ando T. Andrade N. Andres M. Andrés-Carcasona T. Andrić J. Anglin S. Ansoldi J. M. Antelis S. Antier M. Aoumi E. Z. Appavuravther S. Appert S. K. Apple K. Arai A. Araya M. C. Araya J. S. Areeda N. Aritomi F. Armato N. Arnaud M. Arogeti S. M. Aronson K. G. Arun G. Ashton Y. Aso M. Assiduo S. Assis de Souza Melo S. M. Aston P. Astone F. Aubin K. AultONeal G. Avallone S. Babak F. Badaracco C. Badger S. Bae S. Bagnasco E. Bagui Y. Bai J. G. Baier R. Bajpai T. Baka M. Ball G. Ballardin S. W. Ballmer S. Banagiri B. Banerjee D. Bankar P. Baral J. C. Barayoga B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta S. D. Barthelmy M. A. Barton I. Bartos S. Basak A. Basalaev R. Bassiri A. Basti M. Bawaj P. Baxi J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale F. Beirnaert M. Bejger D. Belardinelli A. S. Bell V. Benedetto D. Beniwal W. Benoit J. D. Bentley M. Ben Yaala S. Bera M. Berbel F. Bergamin B. K. Berger S. Bernuzzi M. Beroiz D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge N. Bevins R. Bhandare U. Bhardwaj R. Bhatt D. Bhattacharjee S. Bhaumik S. Bhowmick A. Bianchi I. A. Bilenko G. Billingsley A. Binetti S. Bini O. Birnholtz S. Biscoveanu A. Bisht M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair F. Bobba N. Bode G. Bogaert G. Boileau M. Boldrini G. N. Bolingbroke A. Bolliand L. D. Bonavena R. Bondarescu F. Bondu E. Bonilla M. S. Bonilla A. Bonino R. Bonnand P. Booker A. Borchers V. Boschi S. Bose V. Bossilkov V. Boudart A. Boumerdassi A. Bozzi C. Bradaschia P. R. Brady M. Braglia A. Branch M. Branchesi M. Breschi T. B Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-14476 Potsdam Germany LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Graduate School of Science Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8551 Japan LIGO Hanford Observatory Richland Washington 99352 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli I-80126 Napoli Italy University of Warwick Coventry CV4 7AL United Kingdom OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia The Pennsylvania State University University Park Pennsylvania 16802 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA Louisiana State University Baton Rouge Louisiana 70803 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Stanford University Stanford California 94305 USA Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Dipartimento di Fisica Università degli Studi di Torino I-10125 Torino Italy INFN Sezione di Torino I-10125 Torino Italy SUPA University of Glasgow Glasgow G12 8QQ United Kingdom OzGrav University of Western Austral

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation timescale of DM.

关键词： Dark matter Particle dark matter Gravitational wave detectors

来源：评论

学校读者我要写书评

暂无评论

Localized-endemic state transition in the susceptible-infected-susceptible model on networks

arXiv

引用

arXiv 2017年

作者： Wei, Zong-Wen Liao, Hao Zhang, Hai-Feng Xie, Jia-Rong Wang, Bing-Hong Chen, Guo-Liang Guangdong Province Key Laboratory of Popular High Performance Computers College of Computer Science and Software Engineering Shenzhen University Shenzhen518060 Department of Modern Physics University of Science and Technology of China Hefei230027 China School of Mathematical Science Anhui University Hefei230601 China

It is a longstanding debate concerning the absence of threshold for the susceptible-infected-susceptible spreading model on networks with localized state. The key to resolve this controversy is the dynamical interaction pattern, which has not been uncovered. Here we show that the interaction driving the localized-endemic state transition is not the global interaction between a node and all the other nodes on the network, but exists at the level of super node composed of highly connected node and its neighbors. The internal interactions within a super node induce localized state with limited lifetime, while the interactions between neighboring super nodes via a path of two hops enable them to avoid trapping in the absorbing state, marking the onset of endemic state. The hybrid interactions render highly connected nodes exponentially increasing infection density, which truly account for the null threshold. These results are crucial for correctly understanding diverse recurrent contagion phenomena. Copyright © 2017, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：