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Construction of rotation symmetric bent functions with maximum algebraic degree

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Science China(Information Sciences) 2018年第3期61卷 214-216页

作者： wenying zhang Guoyong HAN School of Information Science and Engineering Shandong Normal University School of Management Engineering Shandong Jianzhu University

Boolean functions that are invariant under the action of cyclic rotation on the inputs are called rotation symmetric functions[1].Aside from their simple algebraic descriptions,rotation symmetric functions have implementation advantages in either hardware or software employing the bit-slicing technique,since they produce a shallow circuit

关键词： GF ANF Construction of rotation symmetric bent functions with maximum algebraic degree

Construction of Balanced Rotation Symmetric Boolean Functions with Optimal Algebraic Immunity

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Wuhan University Journal of Natural Sciences 2014年第4期19卷 301-306页

作者： zhang wenying School of Information Science and Engineering Shandong Normal University Science and Technology on Information Assume Laboratory

Algebraic immunity is a new cryptographic criterion proposed against algebraic attacks. In order to resist algebraic attacks, Boolean functions used in many stream ciphers should possess high algebraic immunity. This paper presents one main result to find balanced rotation symmetric Boolean functions with maximum algebraic immunity. Through swapping the values of two orbits of rotation class of the majority function, a class of 4k＋l variable Boolean functions with maximum algebraic immu- nity is constructed. The function f（x） we construct always has terms of degree n-2 independence of what ever n is. And the nonlinearity off（x） is relatively good for large n.

关键词： Boolean function algebraic attack Walsh spectrum algebraic degree algebraic immunity (AI)

Construction and enumeration of Boolean functions with maximum algebraic immunity

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Science in China(Series F) 2009年第1期52卷 32-40页

作者： zhang wenying WU ChuanKun LIU XiangZhong School of Information Science and Engineering Shandong Normal University Jinan 250014 China State Key Lab of Information Security Institute of Software Chinese Academy of Sciences Beijing 100080 China No. 2 Middle School Attached to Shandong Normal University Jinan 250014 China

Algebraic immunity is a new cryptographic criterion proposed against algebraic attacks. In order to resist algebraic attacks, Boolean functions used in many stream ciphers should possess high algebraic immunity. This paper presents two main results to find balanced Boolean functions with maximum algebraic immunity. Through swapping the values of two bits, and then generalizing the result to swap some pairs of bits of the symmetric Boolean function constructed by Dalai, a new class of Boolean functions with maximum algebraic immunity are constructed. Enumeration of such functions is also n given. For a given function p（x） with deg（p（x））〈 [n/2], we give a method to construct functions in the form p（x）＋q（x） which achieve the maximum algebraic immunity, where every term with nonzero coefficient in the ANF of q（x） has degree no less than [n/2].

关键词： cryptography algebraic attack algebraic immunity Boolean function

Weather Prediction With Multiclass Support Vector Machines in the Fault Detection of Photovoltaic System

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 520-525页

作者： wenying zhang Huaguang zhang Jinhai Liu Kai Li Dongsheng Yang Hui Tian College of Science Harbin Engineering University College of Information Northeastern University IEEE

Since the efficiency of photovoltaic(PV) power is closely related to the weather,many PV enterprises install weather instruments to monitor the working state of the PV power *** the development of the soft measurement technology,the instrumental method seems obsolete and involves high *** paper proposes a novel method for predicting the types of weather based on the PV power data and partial meteorological *** this method,the weather types are deduced by data analysis,instead of weather instrument A better fault detection is obtained by using the support vector machines(SVM) and comparing the predicted and the actual *** model of the weather prediction is established by a direct SVM for training multiclass *** SVM is suitable for classification,the classified results depend on the type of the kernel,the parameters of the kernel,and the soft margin coefficient,which are difficult to *** this paper,these parameters are optimized by particle swarm optimization(PSO) algorithm in anticipation of good prediction results can be *** results show that this method is feasible and effective.

关键词： Fault detection multiclass support vector machines photovoltaic power system particle swarm optimization(PSO) weather prediction

New estimation of triaxial three-layered Earth’s inertia tensor and solutions of Earth rotation normal modes

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Geodesy and Geodynamics 2020年第5期11卷 307-315页

作者： wenying zhang Wenbin Shen School of Geodesy and Geomatics Wuhan UniversityWuhan430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan430079China

Until now, the calculation of the principal inertia moment of the triaxial three-layered Earth mainly adopts the scaling method. This method assumes that the corresponding principal inertia axes of the layers coincide each other, but this is not the case. In this paper, a rigorous tensor transformation rule is adopted to calculate the principal inertia moments(PIMs) of different layers. Appling the new estimated PIMs to the triaxial three-layered Earth rotation theory with considering various couplings, the numerical calculations show that the periods of the Chandler Wobble(CW), Free Core Nutation(FCN), Free Inner Core Nutation(FICN) and Inner Core Wobble(ICW) are respectively 433.0, 430.8, 943.9 and 2735.9 mean solar days, which are well comparable with the corresponding values accepted at present in geoscience community. Better estimates of the PIMs of different layers may provide better constrains on relevant physical parameters of the Earth’s interior.

关键词： Earth Inner inertia

Changes in gas exchange,root growth,and biomass accumulation of Platycladus orientalis seedlings colonized by Serendipita indica

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Journal of Forestry Research 2019年第4期30卷 1199-1207页

作者： Chu Wu Qiao Wei Jing Deng wenying zhang College of Horticulture and Gardening Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China Institute of Root Biology Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China College of Agricultural Sciences Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China

Serendipita indica(formerly known as Piriformospora indica),a root endophytic fungus,exhibits multiple functions in some agricultural,horticultural,and medicinal plant *** studied colonization of the roots of Platycladus orientalis,a forest tree species,by *** to improve the quality of the seedlings in seedbeds and survival rates in *** 20 days after inoculation,*** colonized the root cortex of *** *** colonization by *** significantly increased net CO2 assimilation,light use efficiency,and biomass accumulation by both roots and shoots,whereas it did not affect the biomass allocation between roots and *** addition,the symbiosis significantly increased root total length,surface area,and *** view of the two specific traits of ***,i.e.,axenic culture and wide colonization in plants,the fungus might be used for improving quality of *** seedlings and increasing their survival after transplanting.

关键词： Biomass NetCO2 assimilation Serendipita indica Root growth Symbiosis

Nano-Cs_(x)WO_(3):Ultra-broadband nonlinear optical modulator for near-infrared and mid-infrared ultrafast fiber lasers generation

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Nano Research 2022年第5期15卷 4403-4410页

作者： Nan Li Heng Jia Ming Guo wenying zhang Ji Wang Lijun Song Institute for Interdisciplinary Quantum Information Technology Jilin Engineering Normal UniversityChangchun 130052China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Peng Cheng Laboratory No.2Xingke 1st StreetShenzhen 518000China

Saturable absorbers(SAs)covering wavelengths from near-infrared(NIR)to mid-infrared(MIR)band are required for mode-locking and Q-switching lasers in muti-band ***,broadband nonlinear optical property was discovered in Cs_(x)WO_(3) nanorods(NRs),which as a novel non-stoichiometric SA for realizing ultrafast fiber lasers is first *** Cs_(x)WO_(3) NRs based SA exhibited good mode-locking ability in three key wavelengths from NIR to MIR region,which is a key advantage over the most reported broadband *** given Cs_(x)WO_(3) NRs showed a broadband optical absorption from 800 to 3,200 nm,and excellent SA properties at 1-μm,1.5-μm,and 2-μm optical *** such SA,the ultrashort pulse lasers with a pulse duration/repetition rate of 530 fs/37.42 MHz at 1,567 nm and 5.6 ps/41.50 MHz at 1,965 nm from Er-and Tm-doped fiber lasers(TDFL)were realized *** addition,a stable mode locked operation at 1,030 nm with a repetition rate of 48.80 MHz was also achieved from Yb-doped fiber laser(YDFL).This work not only offers a new and reliable broadband mode locker for ultrafast laser generation,but also broadens the application of Cs_(x)WO_(3) materials in the field of nonlinear fiber optics.

关键词： Cs_(x)WO_(3)nanorods(NRs) nonlinear optical modulator broadband saturable absorber ultrafast fiber laser

Bonded excimer in stacked adenines:Semiclassical simulations

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Science China Chemistry 2012年第7期55卷 1377-1383页

作者： DOU YuSheng ZHAO WenHui YUAN Shuai zhang wenying TANG Hong Institute of Bioinformatics Chongqing University of Posts and Telecommunications Chongqing 400065 China Department of Physical Sciences Nicholls State University Thibodaux Louisiana 70310 USA

The nonradiative decay of a n-stacked pair of adenine molecules, one of which was excited by an ultrafast laser pulse, is studied by semiclassical dynamics simulations. This simulation investigation is focused on the effect of the formation of bonded excimer in stacked adenines on the mechanism of ultrafast decay. The simulation finds that the formation of the bond- ed excimer significantly lowers the energy gap between the LUMO and HOMO and consequently facilitates the deactivation of the electronically excited molecule. On the other hand, the formation of the chemical bond between two stacked adenines re- stricts the deformation vibration of the pyrimidine of the excited molecule due to the steric effect. This slows down the formation of the coupling between the HOMO and LUMO energy levels and therefore delays the deactivation process of the excited adenine molecule to the electronic ground state.

关键词： stacked adenines bonded excimer semiclassical dynamics simulation

Piriformospora indica confers drought tolerance on Zea mays *** enhancement of antioxidant activity and expression of drought-related genes

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The Crop Journal 2017年第3期5卷 251-258页

作者： Le Xu Aiai Wang Jun Wang Qiao Wei wenying zhang Hubei Collaborative Innovation Center for Grain Industry/Research Center of Crop Stresses Resistance Technologies Yangtze UniversityJingzhou 434025China

Drought stress is one of the most severe environmental constraints to plant growth and crop productivity. Plant growth is greatly affected by drought stress, and plants, to survive,adapt to this stress by invoking different pathways. Piriformospora indica, a root-colonizing endophytic fungus of Sebacinales, promotes plant growth and confers resistance to biotic and abiotic stresses, including drought stress, by affecting the physiological properties of the host plant. The fungus strongly colonizes the roots of maize(Zea mays L.) and promotes shoot and root growth under both normal growth conditions and drought stress. We used polyethylene glycol(PEG-6000) to mimic drought stress and found that root fresh and dry weight, leaf area, SPAD value, and leaf number were increased in P. indica-colonized *** antioxidative activities of catalases and superoxide dismutases were upregulated within 24h in the leaves of P. indica-colonized plants. Drought-related genes DREB2A, CBL1,ANAC072, and RD29A were upregulated in drought-stressed leaves of P. indica-colonized plants. Furthermore, after drought treatment, proline content increased, whereas accumulation of malondialdehyde(MDA), an indicator of membrane damage, decreased in P. indica-colonized maize. We conclude that P. indica-mediated plant protection against the detrimental effects of drought may result from enhanced antioxidant enzyme activity,proline accumulation, and expression of drought-related genes and lower membrane damage in maize plants.

关键词： Antioxidants Drought-related genes Drought tolerance Piriformospora indica Maize