B92协议的改进与数字签名

对量子密钥分配的B92协议做了一些改进,即通过令发信方Alice故意公布一些假的测量基提高诱使窃听者Eve现身的概率并基于改进的B92协议和RSA加密体制提出了一种双向认证签名方案.

Abstract：

An improvement of B92 quantum key distribution protocol is proposed in this paper. The main idea is to find secret listeners more easily from a trap of the quantum channel by some false basis the sender has inserted. Based on the quantum key distribution protocol of B92 and the RSA public-key cipher system, a new dual safekeeping and mutually authenticated digital signature scheme is constructed.     

不可否认签名方案的一个注记

证明了在Chaum-van Antwerpen不可否认签名方案的否定协议中,通过选择适当的口令参数,签名验证者发现签名者在签名验证过程中否认签名的行为的概率为1,而不是普遍认为的1-1/p,并给出了当消息空间是Z*p而不是Z*p的q阶子群时,签名验证协议所有可能的结果.     

退保因素下保费收入为复合Poisson过程的风险模型

研究了一类风险过程,其中保费收入为复合Poisson过程,描述索赔及退保的计数过程分别为保单到达过程的P-稀疏过程与q-稀疏过程.运用鞅方法得出了破产概率满足的Lundberg不等式和一般公式,并通过数值计算分析了初始资本、期望理赔额及理赔比例、退保比例对保险公司破产概率的影响.

Abstract：

In this article, a risk model is considered where premium income follows compound Poisson processes. The arrival of the claims and the occurrence of the refunding are described as a p-thinning processes and q-thinning processes. By applying the martingale approach, the Lundberg inequality and the formula of the ruin probability are obtained. The effects of initial capital, expected claim amounts, proportions of the claim and the refunding on the ruin probability of the insurance company are analyzed by numerical computation.     

基于双线性对与身份的数字签名方案研究

研究了基于双线性对与身份的可以防止PKG伪造用户有效签名的签名方案,得到几种一般化形式并进行了优化,最后进行了安全分析.

Abstract：

Digital signature, which can provide authentication, integrity and non-repudiation, is a key technique of information security. The authors of this paper propose some new ID-based signatures which can prevent the PKG from forging the signature, and analyse them after optimizing these patterns.     

修理设备可以更换的三部件串-并联可修系统的可靠性

研究了修理设备可以更换的三部件串-并联可修系统.通过适当的假设,利用全概率分解技术和更新过程理论以及拉普拉斯变换工具,得到了系统和修理设备的一些重要可靠性指标.

Abstract：

This paper considers a repairable system of three unit-series-parallel connection with a replaceable facility.Through appropriate assumptions and using the technology of total probability decomposition,Markov renewal process theory and the tool of the Laplace transform,some important reliability indicators of the system and repair facility are obtained.     

正则Markov链的收敛与逼近

研究Markov链中概率转移函数的收敛性,用算子半群的方法证明了正则概率转移函数的收敛与其对应的预解函数的收敛等价,并给出了概率转移函数收敛的q-矩阵条件.

Abstract：

This paper discusses the convergence and approximation in Markov chains by employing operator semigroup method.It is showed that if the Markov chains are regular,then the convergence of a sequence of transition functions is equivalent to the convergence of the corresponding resolvent functions.Furthermore,a condition on qmatrices such that their corresponding Q-functions converge is also obtained.     

个体变异蚁群算法在TSP问题中的应用研究

在蚁群算法中引入个体变异机制,使蚁群中蚂蚁个体的参数产生差异,从而调整概率函数中信息素因子的强度以及距离因子在概率中的作用,使蚂蚁在选路时具有多样性.与传统蚁群算法的对比实验表明该算法加快了收敛速度,改善了求解性能,有效避免了早熟收敛.

Abstract：

Ant colony algorithm has many disadvantages, such as long searching time, easy to fall into the local optimal solution and so on. This paper bring a individual mutation strategy in ACA, which makes the parameters of individual in the ant colony cause to change, enables the strategy of ants route selection to possess variety by coordinating the intensity of the pheromone gent and the effect of the distance gene in the probability function. The experimental results show that the improved algorithm has great effectiveness and efficiency than the Ant Colony algorithm and avoid stagnation efficiently.     

Isolation and Analysis of Drought-Induced Genes in Maize Roots

Maize roots are important component for plant adaptation to soil water deficits because they are supposed to take up water and necessary solutes from the soil. In the present study, the drought-induced genes were isolated in maize roots. A suppression subtractive hybridization protocol was applied to construct a forward subtractive cDNA library from CN165 for drought-stressed maize roots and a number of drought-induced genes were isolated. Totally, 126 uniESTs （containing 82 singlets and 44 contigs） were obtained from 503 available ESTs sequences after macroarray hybridization. UniESTs were analyzed using BLASTN and BLASTX and the results showed that 92% of the uniESTs had homolgous sequences in maize nr database by BLASTN. About 89% of uniESTs appeared the homlogous amino acid sequences in rice protein database but not in maize protein database by BLASTX, implying that those genes are likely new functional genes in maize. Function analysis showed that those genes were involved in a broad spectrum of biological pathways, mainly in signaling and regulatory pathways related to stress tolerance.     

Functional characterization of the catalytic and bromodomain of FgGCN5 in development,DON production and virulence of Fusarium graminearum

FgGCN5, a GCN5 homolog in Fusarium graminearum, plays a critical role in hyphal vegetative growth, asexual and sexual reproduction, deoxynivalenol(DON) biosynthesis and plant infection. For nuclear localized GCN5, four conserved sequence motifs(I–IV) are presented in the catalytic domain and a bromodomain in the carboxy-terminus. As a lysine acetyltransferase, conserved negatively charged residues are present to neutralize the protons from lysine substrates. However, the role of conserved motifs/domains and residues in FgGCN5 are unclear. Here, we generated deletion mutant strains for each the conserved motifs/domains and a glutamate residue 130(E130) replacement mutant. Deletion of each conserved motif in the catalytic domain and replacement of E130 site resulted in manifold defects in hyphae growth, asexual and sexual development, DON biosynthesis, and plant infection. Phenotypic defects in the mutant strains were similar to deletion mutants. The deletion of the bromodomain led a significant reduction in DON production and virulence, with no effects on hyphae growth, asexual or sexual reproduction. FgGCN5 was further found to localize to the nucleus in conidia and hyphae cells. In conclusion, FgGCN5 encodes a nuclear localized acetyltransferase. The conserved motifs in the catalytic domain and E130 are essential for correct functions of the gene. The conserved bromodomain is important for DON production and pathogen virulence. This was the first report to identify the functions of conserved motifs/domains in FgGCN5, which will contribute to our understanding of the mechanism(s) by which FgGCN5 regulates F. graminearum.     

一个迭代序列的不动点问题变分不等式问题及平衡问题

介绍了在Hilbert空间中求解平衡问题,非扩张映射不动点问题及变分不等式问题公共解的迭代序列.在一些参数控制条件下给出了迭代序列的强收敛定理.

Abstract：

This paper introduces the iterative sequences for finding the common solution of an equilibrium problem,a fixed point problem of a nonexpansive mapping and the variational inequality problem in a Hilbert space.Some strong convergence theorems of the iterative sequences are obtained under some parameter controlling conditions.