基于复合问题的有序多重签名算法

数字签名对网络分布式系统中的密钥分配、认证、认可中具有重要作用．文章提出了一种基于RSA的E1Gamal型有序多重数字签名方案,由多人参与对同一文件进行分别签名,攻击者若想从每个用户的公钥中求解私钥,这相当于求解离散对数问题,同样攻击者若要从每一位签名者公开传送的公钥中求解随机数也是求解离散对数悯题．使得在构造签名方案安全性的同时满足了大数分解和离散对数复合问题．利用RSA对消息的加密,避免了消息采用明文的形式发送,保证了信息的机密性．     

基于椭圆曲线的E1Gamal型数字签名

本文首先构造了一个基于椭圆曲线的E1Gamal型广播多重数字签名方案，然后在其基础上我们设计了一个基于改进的椭圆曲线E1Gamal广播多重盲签名方案．这两个方案的安全性强、计算量小、效率高，从理论上分析能够防止系统攻击者的各种攻击．     

非Lipshitz一般集值变分不等式的广义投影算法

设K是实Hibert空间H的非空闭凸子集,T:H→2H为集值映象,g:H→H为单值映象且Kg(H)。所谓一般集值变分不等式问题,即是指,求x*∈H,使得g(x*)∈K,w∈T(x*)且〈w,g(y)-g(x*)〉≥0,g(y)∈K。在求解以上一般集值变分不等式中,投影算法是常用的算法,但是传统的投影算法需集值映象T关于Hausdoff距离是Lipschtz的。首先,在不需要集值映象T关于Hausdoff距离是Lipschtz的情况下,建立了求解一般集值变分不等式的广义投影算法:第0步:取数列{ρ}j使得0ρj1,∑!j=0ρj=+!,∑!j=0ρj2+!.取g(x0)∈K,令j:=0。第1步:令vj∈T(xj),如果vj=0,则停止,此时xj为问题的解。如果vj≠0,则找wj使得〈vj,g(y)-g(xj)〉+〈wj,g(y)-g(xj)〉≥0,g(y)∈K。如果wj=0,则停止,此时xj是问题的解;否则,进入第2步。第2步:计算xj+1使得g(xj+1)=PK[g(xj)+ρjwj];令j←j+1,回到第1步。然后,在{w}j有界和集值映象T为g-强伪单调的条件下,证明了由该算法产生的序列{x}j强收敛于一般集值变分不等式的解。最后,对广义投影算法作一些修正,保证算法中的序列{w}j是有界的。     

单调函数的测度表示

本文的主要结果是证明了对任何非增的右连续函数g(x)总存在某个可测集E上的可测函数f(X)使得m(E(f>x))=g(x)     

非Lipshitz一般集值变分不等式的广义投影算法

设K是实Hibert空间H 的非空闭凸子集,T:H→2H为集值映象,g:H→H 为单值映象且K g(H)。所谓一般集值变分不等式问题,即是指,求x*∈H,使得g(x*)∈K,w∈T(x*)且≥0, g(y)∈K。在求解以上一般集值变分不等式中,投影算法是常用的算法,但是传统的投影算法需集值映象 T 关于Hausdoff距离是Lipschtz的。首先,在不需要集值映象T 关于Hausdoff距离是Lipschtz的情况下,建立了求解一般集值变分不等式的广义投影算法:第0步:取数列{ρ j}使得0<ρj<1,∑￥j=0ρj = +￥,∑￥j=0ρj2<+ ￥.取g(x0)∈K,令j:=0。第1步:令vj∈T(xj),如果vj=0,则停止,此时xj为问题的解。如果vj≠0,则找wj使得 # 。如果wj=0,则停止,此时xj是问题的解;否则,进入第2步。第2步:计算xj+1使得g(xj+1)=PK[g(xj)+ρjwj];令j←j+1,回到第1步。然后,在 {w }j有界和集值映象T 为g-强伪单调的条件下,证明了由该算法产生的序列 {x }j强收敛于一般集值变分不等式的解。最后,对广义投影算法作一些修正,保证算法中的序列{w }j是有界的。（注：#处为公式）
     

图的子图中(n,r)-正交因子分解

设图G的顶点集为V(G)，边集为E(G)，g和f是定义在V(G)上的2个整值函数，满足对于一切x∈V(G)，g(x)≤f(x).若G是一个(mg+rn，mf-rn)-图，1≤n＜m，r≥2，且对于x∈V(G)，有g(x)≥k≥1，则存在G的一个子图G′，使得G′具有一个(f，g)-因子(n，r)-正交于G的任意给定子图H，其中｜E(H)｜=nk.     

基于原子防护的SM2算法实现及简单功耗分析

SM2算法是中国商用椭圆曲线公钥密码标准算法。SM2算法实现过程中如不加防护措施,攻击者利用简单功耗分析(simple power analysis, SPA)即可破解私钥。为有效防御SPA攻击,提高算法性能,以安全芯片为基础,针对椭圆曲线标量乘运算采用优化的原子防护方法,软硬件实现了SM2算法。同时搭建安全评估环境,进行安全分析实验。结果表明,原子块内功耗波形变化规律基本一致,但原子块间局部功耗波形随着标量乘系数比特值不同而存在明显差异,从而导致私钥泄露,成为信息安全隐患。针对泄露位置进行原因分析,提出了改进的实现策略。实验结果表明所提出的策略可有效抵御SPA攻击。     

Hermite插值的逐步迭代算法

通过定义插值因子，对Hermite插值问题依次考虑满足插值结点x1；x1，x2；x1，x2，x3；…；x1，x2，…，气处的插值条件，采用逐步迭代的方法构造插值多项式，得到插值多项式系数的递推公式．给出的数值例子验证了所给算法的有效性．     

多面体最佳逼近的算法

本文给出了有限维欧氏空间中求一点在一多面体中的最佳逼近x*的一种算法,由此算法可得到一个有限序列x10,x11…,x1,xm0,xn1…,xm,使得xm=x*.     

与任意图2-正交的(g,f)-因子分解

设G是一个图，用V(G）和E(G）表示它的顶点集和边集，并设g(x）和f(x）是定义在V(G）上的两个整数值函数，且对每个x∈V(G），有4≤g(x)≤f(x)，则图G的一个支撑子图F称为G的一个（g，f）-因子，如果对每个x∈V(G)，有g(x)≤dF(x)≤f(x)。图G的（g，f）-因子分解是指E(G）能划分成边不交的（g，f）-因子，设F={F1,F2,…,Fm}和H分别是图G的因子分解和子图，若对所有1≤i≤m有|E(H)∩E(Fi）|=2，则称F和H2-正交。本文证明：若G是一个（mg m-1，mf-m 1）-图，H是G中任一有2m条边的子图，则G有一个（g，f）-因子分解与H2-正交。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.