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Certificateless key-insulated signature without random oracles

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第12期10卷 1790-1800页

作者： Zhong-mei WAN Xue-jia LAI Jian WENG Sheng-li LIU yu LONG xuan HONG Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China college of Science Hohai University Nanjing 210098 China Department of Computer Science Jinan University Guangzhou 510630 China School of lnformation Systems Singapore Management University Singapore 178902 Singapore

Leakage of the private key has become a serious problem of menacing the cryptosystem security. To reduce the underlying danger induced by private key leakage, Dodis et al.(2003) proposed the first key-insulated signature scheme. To handle issues concerning the private key leakage in certificateless signature schemes, we devise the first certificateless key-insulated signature scheme. Our scheme applies the key-insulated mechanism to certificateless cryptography, one with neither certificate nor key escrow. We incorporate Waters (2005)’s signature scheme, Paterson and Schuldt (2006)’s identity-based signature scheme, and Liu et al.(2007)’s certificateless signature scheme to obtain a certificateless key-insulated signature scheme. Our scheme has two desirable properties. First, its security can be proved under the non-pairing-based generalized bilinear Diffie-Hellman (NGBDH) conjecture, without utilizing the random oracle model; second, it solves the key escrow problem in identity-based key-insulated signatures.

关键词： Key-insulated Key leakage Certificateless Bilinear map

Effect of Astragalus complanatus flavonoid on anti-liver fibrosis in rats

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World Journal of Gastroenterology 2005年第37期11卷 5782-5786页

作者： chun-yu Liu Zhen-Lun Gu Wen-xuan Zhou Ci-Yi Guo Department of Pharmacology Medical College of Suzhou University Suzhou 215007 Jiangsu Province China Suzhou Institute of Chinese Meteria Medica Suzhou University Suzhou 215007 Jiangsu Province China The Hong Kong Association for Health Care Ltd Hong Kong China

AIM： To observe the anti-liver fibrosis effect of Astragalus complanatus fiavonoids （ACF） in rats. METHODS： The liver fibrosis model in rats was established by injecting interperitoneally 0.2 mL/100 g 0.5% dimethylnitrosamine, thrice a week. Meanwhile, the rats were administered ACF （30, 60, 120 mg/kg） or colchicine （0.1 mg/kg） once a day for 1 mo. Serum N-propeptide of type Ⅰ procollagen （PINP） and type Ⅲ procollagen （PⅢNP） was measured using ELISA. Malondialdehyde （MDA） and superoxide dismutase （SOD） in hepatic tissue were evaluated. Matrix metal protease-1 （MMP-1） mRNA expression was assayed by RT-PCR and the protein expression of tissue inhibitor of metal protease-1 （TIMP-1） was analyzed by immunohistochemistry. RESULTS： In the ACF groups, SOD activity increased and MDA content decreased in comparison to the liver fibrosis model group. The serum PINP and PⅢNP contents in ACF-2 and -3 group decreased compared to those in model group. In ACF-2 and -3 group, the expression of MMP-1 mRNA increased significantly and the protein expression of TIMP-1 decreased compared to that in model group. CONCLUSION： The antifibrotic mechanisms of ACF are associated with its influence on lipid peroxidation and collagen synthesis and degradation.

关键词： Astragalus complanatus, Liver fibrosis N-propeptide of typeⅠ procollagen N-propeptide of type Ⅲ procollagen Malondialdehyde Superoxide dismutase Matrix metal protease-1 Tissue inhibitor of metal protease-1

Effects of water and fertilizer deficit regulation with drip irrigation at different growth stages on fruit quality improvement of kiwifruit in seasonal arid areas of Southwest china

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Journal of Integrative Agriculture 2023年第10期22卷 3042-3058页

作者： ZHA yu-xuan CHEN Fei WANG Zhi-hui JIANG Shou-zheng CUI Ning-bo State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065P.R.China

For a long time,seasonal drought occurs frequently in Southwest china,and the management of water and fertilizer in kiwifruit orchards has no quantitative standards,which seriously affects the yield and quality of ***,the effects of water and fertilizer deficit regulation with drip irrigation(WFDRDI)on the quality of kiwifruit at different growth stages were explored to achieve water and fertilizer saving,and green and efficient production of *** select‘Jin Yan'kiwifruit and set two water deficit levels(W_(D20%)and W_(D40%))and three fertilizer deficit levels(F_(D15%),F_(D30%)and F_(D45%))at bud burst to leafing stage(stageⅠ),flowering to fruit set stage(stageⅡ),fruit expansion stage(stageⅢ)and fruit maturation stage(stageⅣ),respectively,with a full irrigation and fertilization as the control treatment(CK)in 2017and *** showed that the WFDRDI at stageⅡandⅢhad significant effect on fruit physical quality of kiwifruit,specifically,theⅢ-WD40%F_(D30%)andⅢ-W_(D20%)F_(D45%)treatments significantly increased fruit firmness by 13.62 and 15.59%(P6.47%(P65%(P69.96,36.96 and 34.31%(P61 and 34.79%(P<0.05),respectively;the contents of fructose,glucose and sucrose also had a significan

关键词： water deficit fertilizer deficit water and fertilizer coupling fruit physical quality fruit chemical quality

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少数民族大学生自主学习能力培养的对策研究

教育教学论坛 2024年第30期 51-54页

作者：万春华王辉刘旋儿秦心蕊上海思博职业技术学院卫生技术与护理学院上海201300 白俄罗斯国立大学国际萨哈罗夫环境研究所白俄罗斯明斯克220070

近些年来,少数民族大学生的人才培养工作已成为我国高等教育的重要组成部分,提高少数民族大学生的学业能力及人才质量已成为国家发展和民族团结的需要。聚焦对少数民族大学生自主学习能力的内涵、现状、影响因素及提升对策四方面的综述... 详细信息

近些年来,少数民族大学生的人才培养工作已成为我国高等教育的重要组成部分,提高少数民族大学生的学业能力及人才质量已成为国家发展和民族团结的需要。聚焦对少数民族大学生自主学习能力的内涵、现状、影响因素及提升对策四方面的综述与研究,为高校对少数民族大学生人才培养的教学管理工作提供一定的研究方向和建议,提出培养学生自主学习能力的主要对策是国家落实相关政策,学校营造良好学习环境,教师提升教育教学理念,激发学生潜能。

关键词：少数民族大学生自主学习能力

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三七种植适宜区的分布及其对气候变化的响应

作物学报 2024年第11期50卷 2860-2869页

作者：王露赵炯超王艺璇米艳华张宁怡赵明宇褚庆全中国农业大学农学院北京100193 云南省农业科学院质量标准与检测技术研究所云南昆明650205

探究气候变化背景下三七种植适宜区的时空变化特征可为三七引种栽培、规模生产以及产业发展提供理论参考。基于云南省131条三七地理分布数据和15个环境变量,利用MaxEnt模型分析影响三七分布的主导因子,划分云南省三七种植适宜区,明确196... 详细信息

探究气候变化背景下三七种植适宜区的时空变化特征可为三七引种栽培、规模生产以及产业发展提供理论参考。基于云南省131条三七地理分布数据和15个环境变量,利用MaxEnt模型分析影响三七分布的主导因子,划分云南省三七种植适宜区,明确1961—2020年间云南省三七种植适宜区变化特征。研究结果表明:(1)影响三七分布的主导因子和对应的最适宜区的阈值分别为平均气温日较差(小于10.0)℃、最高气温≥33℃天数(少于5 d)、坡向(北向)、≥10℃年积温(4708.0~5331.9℃d)、年日照时数(1636.7~1963.3 h)和降水季节性差异(92%~96%)。(2)三七种植适宜区主要集中在云南省东南部,包括文山、红河、昆明、玉溪和曲靖等地,约占云南省国土面积的4.8%。(3)1961—2020年间的气候变化提高了云南三七的种植适宜性和适宜区面积,适宜性提高的区域约占全省的18.1%。(4)60多年间,云南省三七最适宜区界限呈向北扩张趋势,适宜区呈向高海拔、高纬度区域迁移的趋势。本研究对于制定合理的云南省三七产业布局和降低气候变化对三七生产的潜在风险,以及农业土地资源管理利用提供理论基础和技术支撑。

关键词：三七 MaxEnt模型气候变化主导因子种植适宜区

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Delineation and Scale Effect of Precision Agriculture management Zones Using Yield Monitor Data Over Four Years

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Agricultural Sciences in china 2007年第2期6卷 180-188页

作者： LI Xiang PAN yu-chun GE Zhong-qiang ZHAO chun-jiang National Engineering Research Center for Information Technology in Agriculture Beijing 100089 P.R. China Henan Information Industry Department Zhengzhou 450008 P.R.China Resource and Environment college Beijing Forestry University Beijing 100083 P.R.China

In this study, precision agriculture management zones were delineated using yield data over four years from the combine harvester equipped with yield monitor and DGPS receiver. Relative yields measured during each year were interpolated to 4 m2 grid size using ordinary kriging. The resultant interpolated yield maps were averaged across years to create a map of the mean relative yield, which was then used for cluster analysis. The mean yield map of post-classification was processed by applying majority filtering with window sizes that were equivalent to the grid sizes of 12, 20, 28, 36, 44, 52 and 60 m. The scale effect of management zones was evaluated using relative variance reduction, test of significant differences of the means of yield zones, spatial fragmentation, and spatial agreement. The results showed that the post-classification majority filtering （PCMF） eliminated lots of isolated cells or patches caused by random variation while preserving yield means, high variance reduction, general yield patterns, and high spatial agreement. The zoned result can be used as yield goal map for preplant or in-season fertilizer recommendation in precision agriculture.

关键词： precision agriculture management zone PCMF scale effect

Online ultrasonic terminal for measuring pig backfat thickness

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International Journal of Agricultural and Biological Engineering 2018年第2期11卷 190-195页

作者： Ganghong Zhang Wanlin Gao Sha Tao Lina yu Guofeng Zhang xuan Luo college of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Informatization Standardization Ministry of AgricultureBeijing 100083China Institute of Semiconductor Chinese Academy of SciencesBeijing100083China School of Microelectronics University of Chinese Academy of SciencesBeijing100049China

The measurement of pig backfat thickness(PBFT)has to stand up to challenges with the reliability,accuracy,and *** PBFT timely and precisely from a finite distance is extremely necessary to improve the process of pig production and implement effective *** an attempt to alleviate these problems,an online handheld terminal was designed with a new method based on ultrasonic technology for measuring PBFT during the process of pig breeding,which can overcome the difficulties encountered in other destructive *** terminal comprised three main components:a main microcontroller unit(MCU)to measure PBFT,a RFID module to identify each pig and send data(***,measurement time and PBFT)to a server via wireless transmission module,and an ultrasonic transducer to drive and receive signals between them.A measurement error within 0-1 mm was acquired through testing three groups of *** indicated that this handheld terminal had a required accuracy and proved that the ultrasonic wave processing method can be deployed in a mobile terminal for PBFT *** also provided a feasible nondestructive alternative to measure *** with information management software platform,this method may ultimately help pig production farmers measure the PBFT accurately and conveniently,and improve the pig production efficiency.

关键词： pig backfat thickness nondestructive measurement ultrasonic technology online terminal pig production

Impact of Continuous Chinese Fir Monoculture on Soil

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Pedosphere 2004年第1期14卷 117-124页

作者： YANGyu-Sheng LIUchun-Jiang： W.KUTSCH CHENGuang-Shuit yuXin-Tuo collegeofGeographyScience FujianNormalUniversityFuzhou350007（China） EcologyCenter UniversityofKielSchauenburgerstr.11224118Kiel（Germany） collegeofForestry FujianAgricultureandForestryUniversityNanping353001（China）

Soil properties were investigated in sites where three succeeding generationsof Chinese fir (Gunning-hamia lanceolata, (Lambert) Hooker) in Nanping, Fujian, china, werecultivated in order to show the impact of a repeated monoculture on site productivity. Compared withthe first generation (FG) stand the soil structure deteriorated in the second generation (SG) andthe third generation (TG) stands. For instance, the destruction rate of the peds increased by 55%-115% in the SG and the TG stands compared to the FG stand. Soil nutrient storage and nutrientavailability also decreased in the SG and the TG stands. For surface soils of 0-20 cm, the organicmatter content, total N and P, and available N and P decreased by 3%-20% relative to those in the FGstand. For many soil parameters, the differences between the FG stand and the SG and the TG standswere statistically significant (LSD test, P management of Chinese fir plantations.

关键词： chinese fir nutrient availability repeated monoculture soil biochemistry soil structure

中国紧密型城市医疗集团建设:典型模式、关键问题与路径优化

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中国卫生政策研究 2024年第1期17卷 9-16页

作者：谭华伟彭馨怡姚辉张雪雨周乐明陈迎春华中科技大学同济医学院医药卫生管理学院湖北武汉430030 霍邱县第一人民医院安徽六安237400 重庆邮电大学计算机科学与技术学院重庆400065

本文从治理结构、组织再造、运行模式、机制协同四个方面归纳总结了典型地区紧密型城市医疗集团建设的基本特征。在此基础上,从权责归属失配、动态能力演进失序、激励调适失焦、绩效考评失衡四个方面分析了紧密型城市医疗集团建设的关... 详细信息

本文从治理结构、组织再造、运行模式、机制协同四个方面归纳总结了典型地区紧密型城市医疗集团建设的基本特征。在此基础上,从权责归属失配、动态能力演进失序、激励调适失焦、绩效考评失衡四个方面分析了紧密型城市医疗集团建设的关键问题。最后,从治理体系、能力提升、利益整合、绩效考评四个方面提出优化紧密型城市医疗集团建设的响应策略。

关键词：城市医疗集团典型模式关键问题响应策略