检索结果-南通市图书馆

On the Construction of Involutory MDS Matrices over F2^m

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第3期33卷 836-848页

作者： BAI Jian sun yao WANG Dingkang KLMM Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China SKLOIS Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China

This paper studies the problem of constructing lightweight involutory maximal distance separable(MDS)*** authors find the exact lower bound of the XOR counts for 4×4 involutory MDS matrices over F2^***,some new structures of 4×4 involutory MDS matrices over F2^mare provided to construct involutory MDS matrices and the authors constructed the lightest4×4 involutory MDS matrices over F2^8so far by using these structures.

关键词： Diffusion layer involutory MDS matrix lightweight

Piezo-/ferroelectric phenomena in biomaterials: A brief review of recent progress and perspectives

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 29-46页

作者： yao sun KaiYang Zeng Tao Li Department of Mechanical Engineering National University of SingaporeSingapore 546080Singapore Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China

There have been overwhelming observations of piezo-/ferroelectric phenomena in many biological tissues and macromolecules,boosting the development of bio-based smart devices and the applications using electromechanical coupling phenomena in biological *** electromechanical coupling is believed to be responsible for various biophysical behaviors and remarkable biomaterial *** the abundant phenomenal observations,the fundamental understanding of the piezo-/ferroelectric effect in biomaterials/systems and the rational design of biobased macroscopic materials with desired piezoelectric responses are still *** this review,we firstly present remarkable historical events on the development of piezo-/ferroelectricity in biomaterials,followed by a brief overview of the fundamental physics of piezo-/*** developments of biopiezo-/bioferroelectricity in protein-based biomaterials and their implications are highlighted *** experimental studies,to identify the intrinsic piezo-/ferroelectric properties from other effects or artifacts is usually *** issue is also addressed and discussed in detail,especially using piezoelectric force microscopy(PFM)and spectroscopy techniques to investigate the local piezo-/ferroelectric phenomena in nanostructured materials are highlighted emphatically.

关键词： biomaterials electromechanical coupling piezoelectric ferroelectric piezoresponse force microscopy

Analyzing Boolean Functions via Solving Parametric Polynomial Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2021年第2期34卷 792-808页

作者： HUANG Zhenyu sun yao LIN Dongdai SKLOIS Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China

In this paper,a new method to analyze Boolean functions is *** this method,one can analyze the balancedness,the nonlinearity,and the input-output correlation of vectorial Boolean *** basic idea of this method is to compute the refined covers of some parametric Boolean polynomial systems which are equivalent to these *** a refined cover,the parameter space is divided into several disjoint components,and on each component,the parametric Boolean polynomial system has a fixed number of *** efficient algorithm based on the characteristic set method to compute refined covers of parametric Boolean polynomial systems is *** experimental results about some instances generated from cryptanalysis show that this new method is efficient and can solve some instances which can not be solved in reasonable time by other methods.

关键词： Boolean functions characteristic set method correlation nonlinearity parametric Boolean polynomial systems

Studyon Evaluation Methods for Lateral Stability of High-Speed Trains

在线全文

学校读者我要写书评

暂无评论

中国铁道科学 2012年第6期33卷 132-139页

作者： yao Jianwei sun Lixia HOU Fuguo Railway Science and Technology Research and Development Center China Academy of Railway Sciences Beijing 100081 China

Taking a high-speed train in China as an example,using computer simulation technology and comparing with the test data,the three current methods including linear stability analysis method,nonlinear stability analysis method and the field testing criterion are studied to evaluate stability of high-speed trains.A new stability evaluation method is proposed which can be used to evaluate lateral stability of high-speed vehicle based on the codes of UIC 515and UIC *** the viewpoint of taking the most unfavorable track conditions into account and improving the safety margin,the new method uses the root mean square of bogie lateral acceleration as a criterion to evaluate the lateral stability of high-speed *** example shows that the proposed method not only considers the forced vibration caused by track irregularities in the actual practice,but also takes the instability self-excited vibration into account,so it can realize early warning of bogie slight unstable oscillation,meanwhile the method itself does not involve complex algorithms which has the possibility of engineering applications.

关键词： High-speed train Lateral stability Critical speed Evaluation method

A New Algorithm for Computing the Extended Hensel Construction of Multivariate Polynomials

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2018年第6期31卷 1633-1646页

作者： LU Dong sun yao WANG Dingkang KLMM Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China SKLOIS Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China.

This paper presents a new algorithm for computing the extended Hensel construction(EHC) of multivariate polynomials in main variable x and sub-variables u1, u2, ···, um over a number field K. This algorithm first constructs a set by using the resultant of two initial coprime factors w.r.t. x, and then obtains the Hensel factors by comparing the coefficients of xi on both sides of an equation. Since the Hensel factors are polynomials of the main variable with coefficients in fraction field K(u1, u2, ···, um), the computation cost of handling rational functions can be high. Therefore,the authors use a method which multiplies resultant and removes the denominators of the rational functions. Unlike previously-developed algorithms that use interpolation functions or Grobner basis, the algorithm relies little on polynomial division, and avoids multiplying by different factors when removing the denominators of Hensel factors. All algorithms are implemented using Magma, a computational algebra system and experiments indicate that our algorithm is more efficient.

关键词： Extended Hensel construction multivariate polynomial resultant sylvester matrix

A Survey on Algorithms for Computing Comprehensive Gröbner Systems and Comprehensive Gröbner Bases

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2019年第1期32卷 234-255页

作者： LU Dong sun yao WANG Dingkang KLMM Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences SKLOIS Institute of Information EngineeringChinese Academy of Sciences

Weispfenning in 1992 introduced the concepts of comprehensive Gr?bner system/basis of a parametric polynomial system, and he also presented an algorithm to compute them. Since then,this research ?eld has attracted much attention over the past several decades, and many effcient algorithms have been proposed. Moreover, these algorithms have been applied to many different ?elds,such as parametric polynomial equations solving, geometric theorem proving and discovering, quanti?er elimination, and so on. This survey brings together the works published between 1992 and 2018, and we hope that this survey is valuable for this research area.

关键词： Comprehensive Gröbner basis comprehensive Gröbner system discovering geometric theorems mechanically parametric polynomial system quantifier elimination

A noval iron-capturing nanocomposites against biofilms for disrupting bacterial nutritional balance

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1760-1761页

作者： Jinying Lin Qihang Ding yao sun Department of Oral Implantology Jilin Provincial Key Laboratory of Tooth Development and Bone RemodelingSchool of StomatologyJilin UniversityChangchun130021China Department of Chemistry Korea UniversitySeoul02841Korea National Key Laboratory of Green Pesticide International Joint Research Center for Intelligent Biosensor Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan430079China

Currently,the escalating crisis of bacterial infections and antibiotic resistance poses a significant global public health challenge[1-3].This situation has driven the search for novel antimicrobial ***,a crucial micr... 详细信息

关键词： metabolism resistance balance

Response of Japanese anchovy(Engraulis japonicus)to the Pacific Decadal Oscillation in the Yellow Sea over the past 400 a

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2022年第8期41卷 31-40页

作者： Haoyu Li Qisheng Tang yao sun College of the Environment and Ecology Xiamen UniversityXiamen 361102China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China

Quantitative identification of long-term changes in the abundance of Japanese anchovy(Engraulis japonicus)in the Yellow Sea is particularly important for understanding evolutionary processes of the Yellow Sea ***,the driving mechanisms of climate variability on the anchovy are still unclear due to the lack of long-term observational *** this study,we used the fish scale deposition rate in the central Yellow Sea to reconstruct the time series of the anchovy stock over the past 400 *** this basis,we further explored the impacts of the Pacific Decadal Oscillation(PDO)on the *** results show that the anchovy stock is positively correlated with the PDO on a decadal time *** addition,anchovy abundance was relatively high during1620–1860 AD(the Little Ice Age,LIA),though in a state of constant fluctuation;anchovy abundance maintained at a relatively low level after~1860 *** particular,followed by overfishing since the 1980 s,the anchovy stock has declined *** on these findings,we infer that fluctuations of the anchovy stock may be regulated by basin-scale“atmosphere–ocean”***,the role of overfishing should not be ignored.

关键词： Japanese anchovy scale deposition rate population fluctuation Pacific Decadal Oscillation Yellow Sea

Tracking Control Design for Nonholonomic Mechanical Systems with Affine Constraints

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2014年第3期11卷 328-333页

作者： Wei sun Yu-Qiang Wu Zong-yao sun School of Automation Southeast University Institute of Automation Qufu Normal University

The trajectory tracking control is considered for nonholonomic mechanical systems with affine constraints and dynamic friction. A new state transformation is proposed to deal with affine constraints, and then an integral feedback compensation strategy is used to identify the dynamic friction. The proposed controller ensures that the output tracking errors converge to zero as t →∞.As an application, a detailed example is presented to illustrate the effectiveness of the control scheme.

关键词： Tracking control nonholonomic systems affine constraints constraint forces integral feedback compensation