Table of Content

    25 May 2023, Volume 44 Issue 3
    Mathematics
    Construction and Properties of Two-Level Optimal Column Augmented Designs
    ZHANG Shixian, TIAN Jiezhong, BAI Qiming, LI Hongyi
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  1-7. 
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    In order to construct augmented designs more flexibly,the author uses a method without computer search which begins with an initial design with less number of columns and transforms by some rules to construct two-level optimal column augmented designs.In addition,the relationship between the column augmented designs and their initial designs is discussed under the E(s) criterion,the generalized minimum aberration criterion and the minimum moment aberration criterion.
    Estimations of a Ros Deficit
    GUO Ruyi, MEI Jingfang
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  8-12. 
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    The upper and lower bounds of a Ros deficit are obtained with the geometric quantities such as the area of the involute line and Wigner caustics of the plane strictly closed convex curve  Γ.
    Computer and communication
    Secure Top-k Query Scheme with Strong Privacy Protection in Cloud Computing Environment
    CUI Shaogang, YIN Hui, ZHOU Chunguang
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  13-28. 
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    In a multi-user application scenario,the cloud can collude with a data owner or a data user to infer an authorized user's query contents.In this paper,we first present the collusion attack model in cloud environments and implement an efficient and strongly privacy protective search scheme.This scheme employs dynamical and secure searchable index construction which not only guarantees the data confidentiality but also extremely fits into the multi-user cloud computing environments where data files are dynamically uploaded frequently,enhancing the availability and scalability of the whole system greatly as well.In addition,in order to satisfy users' individual search requirements,our scheme supports secure relevance ranking for query results according to keyword weight,thus implementing secure top-k query.
    Binocular Stereo Matching Algorithm Based on Improved Census Transform
    AN Geng, YANG Fenlin, ZHOU Mengyuan, DOU Xinrui
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  29-33. 
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    For the problem that the gray value of the center point of the traditional Census transform window is easily affected by noise and the global matching accuracy is low,a binocular stereo matching algorithm based on improved Census transform is proposed.First,the template value of bilateral filtering is used to replace the gray value of the center point of the Census transform window.In order to enhance the reliability of the initial cost calculation,Sobel operator and the absolute error of gray level and the matching cost of the algorithm are added for cost fusion.Then the dynamic cross region is selected to establish the relationship between adjacent parallaxes.Finally,the winner-take-all strategy is used to select the best disparity,and left and right consistency detection and guided filtering are used to optimize the disparity map.The experimental results show that compared with the traditional Census transform,the average mismatch rate of the algorithm is reduced by about 46% in the noiseless case and 53% in the noisy case.It is concluded that the improved algorithm has better accuracy and anti-noise ability.
    Optimal Multiband Collaborative Spectrum Sensing Algorithm Based on Constrained PSO Algorithm
    TIAN Chong, LIU Tingting, TAN Zhewen, TAN Yuhao, LEI Kejun, YANG Xi
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  34-38. 
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    For the difficulties in controlling the total interference of the system with unconstrained PSO algorithm,an optimal multiband cooperative spectrum sensing method based on constrained Particle Swarm Optimization (PSO) algorithm is proposed.This algorithm transforms the constrained optimization problem into an unconstrained optimization problem by introducing a penalty function.Compared with the traditional solutions based on unconstrained PSO algorithm,the proposed constrained PSO algorithm can effectively solve the constrained multiband cooperative spectrum sensing optimization problem,and the optimal solution meets the constraints to avoid excessive total interference.
    Architectural Engineering
    Experimental Study on Flexural Behavior of Finger-Jointed Timber Beams Strengthened with CFRP Sheets
    WANG Jianxing, JIA Yumeng, XUE Meihui
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  39-45. 
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    In order to improve the flexural strength of finger-jointed timber beams,three groups of timber beams were designed and manufactured.Through four-point compression test,the flexural performance of solid timber beams,finger-jointed timber beams and CFRP reinforced finger-joint beams were compared,and the influence of finger-jointed joints on the fracture mode of timber beams was analyzed.The displacement load curve of finger-jointed timber beams and the displacement load curve of finger-jointed timber beams were obtained,and the corresponding distinction was given for the failure characteristics of each type.Therefore,the feasibility of using CFRP to reinforce finger-joint is proposed.The test results show that the appearance of finger-joint has obvious influence on the bending failure process of timber.The appearance of finger-joint makes the fracture mode of timber change from ductile fracture to brittle fracture,and the flexural strength of finger-joint timber beam is significantly improved by using CFRP cloth reinforcement.
    Resources and Environment
    Investigation and Research on Wild Edible Plant Resources in the Mountaintop Platform of Zhangjiajie Tianmenshan National Forest Park,Hunan Province
    LI Yuxuan, JIN Jia, HU Jian, CHEN Gongxi, XIANG Xiaomei
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  46-53. 
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    In order to understand the current situation of wild edible plant resources in the mountaintop platform of Tianmenshan National Forest Park in Zhangjiajie,the wild edible resources in this area were statistically analyzed by field investigation,specimen collection and literature review.The results showed that there were 134 species of wild edible plants belonging to 102 genera and 49 families in the Mountaintop platform of Tianmenshan.Among them,Rosaceae,Compositae and Lily were the dominant families,and Rubus was the dominant genus.Herbs were the main life forms.The geographical composition of species is complex and diverse,with the largest proportion of endemic species in China.The edible category is mainly wild vegetables,and the nutritional value is the largest proportion of fiber.The edible part is mainly leaves,and the cooking method is mainly frying.The edible plant resources on the mountaintop platform of Tianmenshan are rich in species,diverse in cooking methods,and high in nutritional value.
    Pollution Characteristics and Pollution Sources Analysis of SO2,Oand NO2 in Hefei High-Tech Zone
    ZHENG Nina, XU Yaqi, PAN Lingyang
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  54-60. 
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    In this paper,the atmospheric SO2,O3 and NO2 of Hefei High-tech Zone are continuously observed using long-path differential absorption spectroscopy system,and the characteristics of gas pollution and possible pollution sources are analyzed.The diurnal variation shows that SO2 is high at night and low during the day.The diurnal variation of NO2 shows a single peak and single valley type.The rush hour of off-duty traffic has certain effect on NO2.But the whole day concentration of NO2 is on the high side (35~45 μg/m) and the variation is small,so there exist  other important nitrogen oxide emission sources.The diurnal variation of O3 is obvious.Its daytime concentration is high,and the maximum value appears at 16:00 in the afternoon;the concentration is low at night,and the lowest value appears on the early morning.The concentration of NO2 and SO2 in winter is high because of low atmospheric boundary layer.In summer,photolysis reaction is intense,wet deposition is obvious,so the concentration of pollutants is low.On the contrary,the seasonal variation of O3 is contrary.The analysis of pollution sources shows that the high SO2 value is mainly related to the coal burning of rural residents in the northwest of the observation site and the unorganized emission of pharmaceutical companies and paint factories in the southeast of the observation site.However,the high value of NO2 in the east-northeast (wind speed > 6 m/s) wind direction is affected by the long-distance transmission from Hefei Wanneng Power Plant and vehicle exhaust emissions in busy urban areas.The wind speed and direction distribution of O3 and NO2are basically opposite.The correlation coefficient of NO2 and O3 is only -0.429 6.There are other important O3 precursor pollutants in the atmosphere of Hefei Hi-tech Zone.
    Biological
    Identification  of Cellulose Degrading Bacteria in Namco Yak Dung and Its Enzyme Production Characteristics
    LI Qiang, LUO Jin, YANG Jianing, GAO Hongtao, LIU Xuan, HE Jianwu
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  61-65. 
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    Through enrichment and purification,high efficient cellulose degrading strains were screened from yak dung in Namco Lake,Tibet.The enzyme production characteristics of cellulose degrading strains under different conditions were determined,and the genetic differences of the target strains were analyzed.The results showed that strain X1 and X2 had significant cellulose degradation advantage,and the relative enzyme activities of the two strains were strong at pH 4 and 9 ℃.Phylogenetic analysis showed that X1 and X2 might belong to the genus Cronobacter.
    Resistance to Kiwifruit Bacterial Canker and Its Correlation with Sugar Content in Branches of Kiwifruit Varieties
    GAO Jianyou, KUANG Meimei, LUO Qin, TAN Zecheng, CUI Lihong, ZHA Manrong, LIU Shibiao
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  66-72. 
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    In the present experiment,the resistance identification and evaluation of total 13 kiwifruit cultivars in Actinidia chinensis and A. chinensis var. deliciosa to Pseudomonas syringae pv. actinidiae (Psa) was conducted indoors by using wounding method on detached branches.The results showed that the incidence rate,onset time and lesion length of the isolated branches in all tested materials were significantly different after pathogenic bacteria inoculation.The order of resistance of the above cultivars was listed as follows:Miliang-1>Miliang-2>Chuhong>Cuiyu>Beimu>Xiangbiyu>Xiangji>Xiangjihong>Wuzhi-3>Jinyan>Donghong>Guichang>Hongyang,according to the disease lesion length from small to large,at the 25 d after infected Psa.A. chinensis var. deliciosa Miliang-1 was evaluated as the high resistance (HR) cultivar and A. chinensis Hongyang as the high susceptibility (HS) cultivar.The content of soluble sugar in branches decreased significantly after infected Psa,and the higher of the soluble sugar content after infection,the stronger resistance the cultivar had.However,no correlation was observed between the Psa resistance and reducing sugar content,lenticels characters and cortex thickness,respectively.
    Effects of Different Treatment on Seed Germination of Endangered Species Terminalia myriocapra
    YU Xiao, ZHAO Zhenning, DENG Lilan
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  73-79. 
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    In this study,the effects of different exogenous hormones (GA3,NAA) and culture temperature on germination of the seeds were studied after hibernation treatment and indoor temperature presermation.The results showed that the type and concentration of growth regulator had significant effects (P<0.01),but the preservation method and culture temperature had no significant effects on the germination rate of seeds (P>0.05).The degree of influence was the type of growth regulator,the concentration of growth regulator,culture temperature and preservation method in descending order.After the seeds were treated with the same mass concentration of GA3 and NAA growth regulator,the germination rate of seeds was successively from high to low in variable temperature culture in hibernation treatment,constant temperature culture in hibernation treatment,constant temperature culture under normal temperature preservation,and constant temperature culture under normal temperature preservation.The optimal conditions for seed germination were treated at 4 ℃ for 30 days after seed collection,impregnated with 40 mg/L GA3 and cultured at 15~25 ℃ in a light incubator.
    Data Governance
    Comparative Choices for Enterprise Data Usage Rights Protection
    DENG Shuyuan
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  80-86. 
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    Circulation and sharing of data helps promote the prosperity of the digital economy market,and gives enterprises the rights to use data in line with economic development.The key to realizing the value of data lies in the collection,use and sharing of data,and enterprises will turn the information data held by individuals into data with market transaction value after reprocessing and processing such as desensitization.In the "individual-enterprise" data binary structure,in order to avoid the deadlock of the protection mechanism for use and sharing of data,the dispute over data ownership should be temporarily shelved and a data use and sharing mechanism should be established for enterprises.The foothold of the mechanism will be shifted from the perspective of personal interests to the perspective of social interests,and the rational use system of data and the data access system will be clarified,so as to promote the free circulation and full sharing of data and maximize the value of data.
    Education and Sports
    A Survey on Employment of Statistics Graduates from Universities in Western Regions
    CHEN Wangxue, PAN Hao
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  87-90. 
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    Taking the employment data of statistics graduates of Jishou University from 2015 to 2019 as a case,this paper analyzes the employment of graduates from three aspects of employment industry,employment position and employment region.The results indicate that the employment situation for statistics graduates is optimistic,characterized by multiple choices in employment industries and strong professionalism in employment positions.Based on the current employment status,some suggestions are put forward to improve the employment competitiveness of statistics graduates.
    Difficulties and Countermeasures of Blockchain Technology Application in Sports Industry
    KE Yangning
    Journal of Jishou University(Natural Sciences Edition), 2023, 44(3):  91-96. 
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    The application of blockchain technology in sports industry can promote decentralization,build trust mechanism,realize data value,strengthen property protection,and make sports industry a new source of power to promote high-quality economic development.However,the development of "blockchain + sports industry" is faced with such practical difficulties as prominent bottleneck of blockchain technology application,lack of compound talents,insufficiency of regulatory means,and application to be expanded.From improving the top-level design,increasing R & D investment,innovating regulatory technology,and strengthening personnel training,effective countermeasures are put forward for blockchain technology to drive the innovation and development of China's sports industry,so as to help the healthy and efficient development of "blockchain + sports industry".
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