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经济政策不确定性与商业信用融资--基于商业信用网络位置视角的分析

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审计与经济研究 2024年第3期39卷 117-127页

作者：段超颖张文龙刘卓筠山西财经大学金融学院山西太原030006

以2000—2022年沪深A股上市公司数据为样本,研究经济政策不确定性对商业信用融资的影响及商业信用网络位置的调节效应。研究发现,面对经济政策不确定性时,企业会选择提升商业信用融资,企业的商业信用网络中心位置能够帮助企业获得更多... 详细信息

以2000—2022年沪深A股上市公司数据为样本,研究经济政策不确定性对商业信用融资的影响及商业信用网络位置的调节效应。研究发现,面对经济政策不确定性时,企业会选择提升商业信用融资,企业的商业信用网络中心位置能够帮助企业获得更多性商业信用融资。进一步研究表明,面对经济政策不确定性时,商业信用网络中心位置的企业是通过提升企业的议价能力与系统性风险地位进而提升商业信用融资的。面对经济政策不确定性提升,商业信用网络中心位置会缓解企业对银行信用的依赖,但当企业自身能够获得银行信用青睐时,商业信用网络中心位置会进一步提升企业的商业信用。因此建议企业在经济政策不确定高时充分融入商业信用网络,以商业信用资源弥补企业的银行信用不足,同时监管当局需要合理引导优化金融资源配置,避免商业信用与银行信用资源的过度倾斜。

关键词：经济政策不确定性商业信用商业信用网络银行信用企业融资

Recent Results on Constructing Boolean Functions with (Potentially) Optimal Algebraic Immunity Based on Decompositions of Finite Fields

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Journal of Systems Science & Complexity 2019年第1期32卷 356-374页

作者： liu zhuojun WU Baofeng Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science Chinese Academy of Sciences State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences

Boolean functions with optimal algebraic immunity(OAI functions) are important cryptographic primitives in the design of stream ciphers. During the past decade, a lot of work has been done on constructing such functions, among which mathematics, especially ?nite ?elds, play an important role. Notably, the approach based on decompositions of additive or multiplicative groups of?nite ?elds turns out to be a very successful one in constructing OAI functions, where some original ideas are contributed by Tu and Deng(2012), Tang, et al.(2017), and Lou, et al.(2015). Motivated by their pioneering work, the authors and their collaborators have done a series of work, obtaining some more general constructions of OAI functions based on decompositions of ?nite ?elds. In this survey article, the authors review our work in this ?eld in the past few years, illustrating the ideas for the step-by-step generalizations of previous constructions and recalling several new observations on a combinatorial conjecture on binary strings known as the Tu-Deng conjecture. In fact, the authors have obtained some variants or more general forms of Tu-Deng conjecture, and the optimal algebraic immunity of certain classes of functions we constructed is based on these conjectures.

关键词： Additive decomposition algebraic immunity Boolean function multiplicative decomposition Tu-Deng conjecture

DYNAMIC AND VERIFIABLE SECRET SHARING AMONG WEIGHTED PARTICIPANTS

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Journal of Systems Science & Complexity 2007年第4期20卷 481-485页

作者： Yanshuo ZHANG zhuojun liu Beijing Electronic Science and Technology Institute Beijing 100070 China Key Laboratory of Mathematics Mechanization CAS Beijing 100080 China

A secret sharing scheme permits a secret to be shared among participants in such a way that only qualified subsets of participants can recover the secret. Secret sharing is useful in management of cryptographic keys. Based on identity, we analyze the secret sharing scheme among weighted participants. Then we present a dynamic scheme about secret sharing among weighted participants. At last, we analyze the secret sharing scheme among weighted participants, which can make all weighted participants verifiable and dynamic.

关键词： Chinese Remainder Theorem dynamic secret sharing verifiable weighted

Dembowski-Ostrom Polynomials from Reversed Dickson Polynomials

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Journal of Systems Science & Complexity 2016年第1期29卷 259-271页

作者： ZHANG Xiaoming WU Baofeng liu zhuojun Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems ScienceChinese Academy of Sciences Beijing 100190 China State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences Beijing 100093 China

This paper gives a full classification of Dembowski-Ostrom polynomials derived from the compositions of reversed Dickson polynomials and monomials over finite fields of characteristic *** authors also classify almost perfect nonlinear functions among all such Dembowski-Ostrom polynomials based on a general result describing when the composition of an arbitrary linearized polynomial and a monomial of the form x^(2+2^α) is almost perfect *** turns out that almost perfect nonlinear functions derived from reversed Dickson polynomials are all extended affine equivalent to the well-known Gold functions.

关键词： Almost perfect nonlinear function Dembowski-Ostrom polynomial linearized polynomial reversed Dickson polynomial

A Combinatorial Condition and Boolean Functions with Optimal Algebraic Immunity

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Journal of Systems Science & Complexity 2015年第3期28卷 725-742页

作者： JIN Qingfang liu zhuojun WU Baofeng ZHANG Xiaoming Key Laboratory of System and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science Chinese Academy of Sciences State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences

This paper first proposes an infinite class of 2k-variable Boolean functions with high nonlinearity and high algebraic degree. Then an infinite class of balanced Boolean functions are proposed by modifying the above Boolean functions. This class of balanced Boolean functions have optimal algebraic degree and high nonlinearity. Both classes have optimal algebraic immunity based on a general combinatorial conjecture.

关键词： Algebraic degree algebraic immunity balancedness Bent function Boolean function nonlinearity.

Three new infinite families of bent functions

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Science China(Information Sciences) 2018年第3期61卷 43-56页

作者： Libo WANG Baofeng WU zhuojun liu Dongdai LIN State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems ScienceChinese Academy of Sciences

Bent functions are maximally nonlinear Boolean functions with an even number of *** are closely related to some interesting combinatorial objects and also have important applications in coding, cryptography and sequence design. In this paper, we firstly give a necessary and sufficient condition for a type of Boolean functions, which obtained by adding the product of finitely many linear functions to given bent functions, to be bent. In the case that these known bent functions are chosen to be Kasami functions, Gold-like functions and functions with Niho exponents, respectively, three new explicit infinite families of bent functions are obtained. Computer experiments show that the proposed familes also contain such bent functions attaining optimal algebraic degree.

关键词： bent function Hadamard matrix Kasami function Gold-like function Niho exponent

A NOTE ON TWO CLASSES OF BOOLEAN FUNCTIONS WITH OPTIMAL ALGEBRAIC IMMUNITY

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Journal of Systems Science & Complexity 2014年第4期27卷 785-794页

作者： WU Baofeng liu zhuojun JIN Qingfang ZHANG Xiaoming State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences Key Laboratory of Mathematics Mechanization.Academy of Mathematics and Systems Science Chinese Academy of Sciences Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems ScienceChinese Academy of Sciences

Tu and Deng proposed a class of bent functions which are of optimal algebraic immunity under the assumption of a combinatorial *** this paper,the authors compute the dual of the Tu-Deng functions and then show that they are still of optimal algebraic immunity under the assumption of the same *** another class of Boolean functions constructed by Tang,et *** are of optimal algebraic immunity with similar forms to Tu-Deng functions,the authors show that they are not bent functions by using some basic properties of binary complete Kloosterman sums.

关键词： Algebraic immunity bent function Boolean function Kloosterman sums Walsh trans-form.

Delegateable signatures based on non-interactive witness indistinguishable and non-interactive witness hiding proofs

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Science in China(Series F) 2008年第2期51卷 128-144页

作者： TANG ChunMing PEI DingYi WANG XiaoFeng liu zhuojun Province Key Laboratory Institute of Information Security of Guangzhou University Guangzhou 510006 China State Key Laboratory of Information Security Chinese Academy of Sciences Beijing 100080China School of Mathematics and Computational Mathematics of Shenzhen University Shenzhen 518060 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

A delegateable signature scheme （DSS） which was first introduced by Barak is mainly based on the non-interactive zero-knowledge proof （NIZK） for preventing the signing verifier from telling which witness （i.e., restricted subset） is being used. However, the scheme is not significantly efficient due to the difficulty of constructing NIZK. We first show that a non-interactive witness indistinguishable （NlWl） proof system and a non-interactive witness hiding （NIWH） proof system are easier and more efficient proof models than NIZK in some cases. Furthermore, the witnesses em- ployed in these two protocols （NlWl and NIWT） cannot also be distinguished by the verifiers. Combined with the E-protocol, we then construct NlWl and NIWH proofs for any NP statement under the existence of one-way functions and show that each proof is different from those under the existence of trapdoor permutations, Finally, based on our NlWl and NIWH proofs, we construct delegateable signature schemes under the existence of one-way functions, which are more efficient than Barak＇s scheme under the existence of trapdoor permutations.

关键词： delegateable signature non-interactive zero-knowledge non-interactive witness indistinguishable non-interactive witness hiding,∑-protocol

Reply to Comment on“Chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3) nanoflakes”

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Nano Research 2024年第9期17卷 8649-8650页

作者： Yang Chen Yuanyuan Jin Junqiang Yang Yizhang Ren zhuojun Duan Xiao liu Jian Sun Song liu Xukun Zhu Xidong Duan Institute of Chemical Biology and Nanomedicine(ICBN) College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China School of Physics and Electronics Central South UniversityChangsha 410083China

1 Introduction Thanks very much for *** taking time to comment on our recent paper regarding“Chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3) nanoflakes”.We summarize the suggestions of *** as made in the comment[1].First,*** suggested that there are just three peaks of two S 2p doublets in Fig.2(b)in the original paper[1],which is inconsistent to the four peaks of previous reports[2-4].Second,*** mentioned that the ratio of two S 2p doublets is helpful to identify the sulfur vacancies,which have a great impact on the n-type semiconducting nature of ZrS_(3).Third,*** mentioned that Zr 3d peak appearing at 184.7 eV is wider than previous reports[2,4],which may be accounted by the appearance of ZrS_(2)O,and Zr remains in the tetravalent state.

关键词： state. synthesis quasi