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Search Results: 1 - 10 of 337092 matches for " 刘文军? "
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对一个环Zn上圆锥曲线数字签名的分析与改进
Analysis and Improvement of a Digital Signature Based on Conic Curve over Zn
 [PDF]

, 杨先
Software Engineering and Applications (SEA) , 2012, DOI: 10.12677/SEA.2012.12008
Abstract:

杨慧等人基于环Zn上的圆锥曲线构造了一个ElGamal型数字签名方案,文章分析指出,该方案的私钥可以从公钥和签名中恢复出来,因而该签名方案是不安全的。对杨慧等人的签名方案进行了改进,通过分析可知改进方案能够抵抗密钥恢复攻击。基于改进数字签名方案构造了一个多重数字签名方案,该多重数字签名方案无需进行多次交换数据以获得同一个参数,减少了通信量。

Under the analyses of an ElGamal digital signature scheme based on conic curve over Zn proposed by Yang Hui et al., this paper reveals that the secret key can be gained by the public key and the signature, so Yang et al.’s scheme is not security. An improved digital signature scheme is given, and it can resist the secret key gaining attack. Moreover, a multi-signature digital scheme is supplied based on the improved digital signature scheme. The multi- signature digital scheme has the advantage not to exchange many times among singers to get the same parameter, and therefore reduces the communication traffic.

 

基于粗糙集与模糊集理论的图书馆最优选书算法
An Optimal Algorithm of Selection Books in Library Based on Rough Set and Fuzzy Set
 [PDF]

赵利萍,
Computer Science and Application (CSA) , 2012, DOI: 10.12677/CSA.2012.25048
Abstract: 本文将粗糙集理论与模糊集理论结合起来给出一种图书馆最优选书算法。该算法首先从已知数据的初始信息系统出发计算各选书方案之间的相似度,从而构造相似矩阵然后根据相似矩阵的传递闭包对各方案进行聚类,并根据粗糙集理论求各属性重要性最后利用加权综合的思想及最小距离方法选择最优买书方案。
Combining rough set and fuzzy set theory, an optimal decision algorithm of library to select books is put forward. During this algorithm, firstly, we construct the similarity matrix from the original information system; secondly, we classify all the programs according to fuzzy clustering; thirdly, an algorithm to choose the optimal program is put forward according to the minimum distance of weighted relative deviation.
湖南省农业经济增长的动态面板分析
Dynamic Panel Analysis of Hunan Agricultural Economic Growth
 [PDF]

周路,
World Economic Research (WER) , 2015, DOI: 10.12677/WER.2015.44008
Abstract:
基于1988~2012年湖南省14个市州动态面板数据,运用广义矩估计GMM方法,对湖南省农业经济增长的影响因素进行实证研究。研究发现,前一期的农业经济、农作物播种面积、农业机械总动力和化肥施用量对农业经济增长有着显著的正向促进影响。有效灌溉面积和农业劳动力人数对农业经济增长具有负向影响。在此基础上,就促进湖南省农业经济增长提出了政策建议。
Based on dynamic panel data of 14 regions in Hunan Province from 1988 to 2012 and by applying the method of GMM estimation, this paper conducts an empirical study of the impact of Hunan agricultural economic growth. The result identifies that the former agricultural economic growth, the agricultural crop sown area, the total power of agricultural machinery and fertilizer input have a positive function of agricultural economic growth; while agricultural labor and effective irrigate area have a negative impact. On this basis, this paper puts forward policies to improve the growth of agricultural economy.
湖南省农村金融发展与农业全要素生产率的动态关系研究—基于DEA与VAR的实证分析
Research on the Interaction between Rural Financial Development and Agricultural Total Factor Productivity—Empirical Analysis Based on the Method of DEA and VAR Model
 [PDF]

周路,
World Economic Research (WER) , 2016, DOI: 10.12677/WER.2016.53008
Abstract:
本文利用1988~2012年湖南省14个市州的农业指标数据,运用DEA Malmquist指数方法测算了农业技术效率、农业技术进步以及农业全要素生产率,同时利用1988~2012年湖南省农村金融发展的数据测算了农村金融发展规模、农村金融发展效率及农村金融发展结构;然后利用协整检验和脉冲响应函数分析湖南省农村金融发展三个指标分别与湖南省农业技术效率、技术进步、农业全要素生产率的相互影响。结果表明:湖南省农村金融发展三个指标分别与其农业技术效率、技术进步和全要素生产率具有长期稳定均衡关系;金融发展规模对农业技术进步及农业全要素生产率影响具有中短期作用,金融发展效率对两者具有长期的影响作用,而金融发展结构对农业技术进步及农业全要素生产率影响为负,对农业技术效率影响为正;农业技术进步与农业全要素生产率对农村金融发展影响相似,前期具有正向影响,而后期具有负向影响;农业技术效率对农村金融发展前期具有正向影响,中期具有负向影响,而后期具有正向影响。
Using DEA Malmquist index, this paper measures the agricultural total factor productivity levels, the efficiency of agricultural technology and the agricultural technological progress in 14 regions of Hunan province during 1988-2012. While using correlated data in Hunan rural finance devel-opment, it also estimates the development scale, development efficiency and development struc-ture of rural financial. Interaction impacts between three indicators of rural financial development and technological efficiency, technological advances and TFP will be analyzed respectively through cointegration test and impulse response function. The results show that: there’s a long-term stable equilibrium relationship between the three indicators of the rural financial development and its agricultural technical efficiency, technological progress and TFP in Hunan province. Financial development scale has short-term and medium-term effects on technological progress; TFP and financial development efficiency have long-term impacts on them, while the financial development structure has negative impacts on agricultural technological progress and TFP, and positive impacts on the efficiency of agricultural technology. Agricultural technological progress and TFP have similar impacts on rural financial development: that is, positive impacts in the earlier stage, negative impacts in the later. Agricultural technical efficiency has positive impacts on rural finance in the earlier stage, negative impacts in the middle, and positive impacts in the later.
生物制品专刊序言

生物工程学报 , 2011,
Abstract: 生物制品是一类预防、诊断和治疗疫病的特殊制剂。生物制品的研发是融合微生物学、免疫学、分子生物学、细胞学、基因工程及发酵工艺等学科知识的综合技术体现。生物制品产业是整个生物技术产业的核心和热点。近年来,我国在生物制品研发方面取得了较大进步,为促进我国生物制品研究的交流,本期“生物制品”专刊集中展现了我国生物制品研究人员在预防生物制品、诊断制品、治疗生物制品领域所取得的最新进展。
具随机刚度梁结构的重特征值计算

武汉理工大学学报 , 2006,
Abstract: ?利用一种新的方法来研究具随机刚度梁结构的重特征值问题。将材料物理量的随机场扩展为k-l(karhunen-loeve)正交展式,运用矩阵技巧处理重特征值对应的特征向量,采用二阶收敛的非正交多项式展开式表示梁结构的重特征值和特征向量,建立了类似于摄动法的一系列确定性的递推方程,求解这些递推方程,得到了重特征值的均值和均方差。悬臂、简支和固支梁的算例表明:递推随机有限元法的结果能在较宽的随机涨落范围内较好地逼近蒙特卡罗模拟法的结果,而且相对于蒙特卡罗模拟法而言可以节省大量计算时间。
教育电子身份认证系统的安全策略研究
A Study on Security Strategies of Educational Electronic Identity Authentication System
 [PDF]

周庆华, , , 唐俊龙, 唐立
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.66043
Abstract: 教育电子身份认证系统涵盖了以e2ID提供认证服务的教育应用系统日常运行的方方面面,因而保障其安全、稳定地运行显得尤为重要。本文分析了教育电子身份认证系统存在的各种安全隐患,从管理和技术两方面提出了保障教育电子身份认证系统安全、稳定运行的安全策略。
The authentication system of educational electronic identity covers various aspects in daily oper-ations of educational application system in which authentication is served by e2ID. Therefore, its security assurance and steady operation are extremely important. This paper analyzes a variety of security risks in the educational electronic identity authentication system, and puts forward safety strategies from both the management and technical measures.
关于内蒙古与晋冀交界地区早前寒武纪灰片麻岩和孔兹岩的讨论
阎月华,
岩石学报 , 1996,
Abstract:
三重介质油藏有限导流垂直裂缝井的流-固耦合模型
,,
工程力学 , 2013, DOI: 10.6052/j.issn.1000-4750.2011.09.0647
Abstract: 考虑了三重介质油藏介质变形与垂直裂缝井闭合的影响,推广了Cinco-LeyH的有限导流垂直裂缝井的双线性渗流理论,将流体在垂直裂缝井与地层中形成的渗流划分为两个区域:三重介质油藏中的非线性流动区域和垂直裂缝井内的非线性流动区域;由此建立了三重介质油藏有限导流垂直裂缝井的流-固耦合模型。鉴于该模型的强非线性,采用稳定的有限差分格式求得其数值解,并将数值结果绘制成试井样板曲线。将数值结果与不考虑介质变形或垂直裂缝闭合的模型进行对比验证了该文模型研究的必要性。另外,还讨论了垂直裂缝井渗透率模量、窜流系数、基岩弹性储容比、井筒储集系数对无因次井底压力及压力导数的敏感性影响。
一人多机的动态配置模型及其解法
,
中国管理科学 , 1996,
Abstract: ?本文以机械企业为背景,探讨了一人多机看管问题中的人员配置问题,并采用层次序列法对人员配置数学模型进行了求解,给出了启发式解法,指出了进一步研究的方向。
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