泊松分布下信息安全事件概率计算模型

从信息安全事件的概率分布规律出发,根据泊松分布的基本特征,通过数学证明了信息安全事件发生频数服从泊松分布,并采用国家互联网应急中心(CNCERT/CC)统计数据验证了这一理论结果.在此基础上,基于贝叶斯定理,建立了泊松分布下的信息安全事件概率计算模型.根据泊松分布的概率质量函数,计算了信息安全事件发生频数的先验概率分布;通过构建似然函数调整先验概率分布,得到信息安全事件发生频数后验概率分布;最后,采用CNCERT/CC统计数据验证了该模型的可行性和有效性.     

q -对称熵损失函数下Pareto分布参数估计

Pareto分布作为一种收入分布有着很重要的现实意义,其形状参数的大小直接影响收入分布的均衡程度,因此在经济中有着广泛的应用价值.主要研究了q-对称熵损失函数下Pareto分布形状参数的最小风险同变估计和Bayes估计.通过证明得到,在适当的Γ-先验分布下,α的Bayes估计都具有统一的形式[cT＋d]-1.并且,针对c和d的各种不同取值情况,讨论了[cT＋d]-1的可容许性和不可容许性,给出了q-对称熵损失函数下参数的最小最大估计.     

CF／PEEK复合材料的摩擦磨损行为研究

研究了碳纤维增强聚醚醚酮（ＣＦ／ＰＥＥＫ）复合材料的摩擦磨损行为．结果表明复合材料的摩擦系数与磨损率依赖于材料中纤维的含量，在１０％～２０％范围有最低值，并对载荷有明显的依赖性．纤维含量的影响是碳纤维本身的减摩阻磨性和其对纤维在树脂中所处的分散状态及纤维在作用中的变化的依赖性有关；而载荷的影响则与树脂在作用过程中产生热后所处的物理状态有关．由于纤维对材料的摩擦尤其是磨损性能可能产生不利的影响，如纤维受磨减薄后产生的碎片导致磨料性磨损，而这种影响可通过复合材料的制备工艺来达到一定程度的控制，制备工艺对获得理想材料至关重要     

网页正文信息抽取新方法

基于包装器的信息抽取方法只能处理一种特定的信息源,而且对网页结构的依赖性强.基于此提出了一种将中文标点符号和HTML树结构作为识别网页正文内容重要特征的网页分析方法,通过统计中文标点符号确定部分正文信息,然后根据正文信息在结构上的相似性确定其他正文信息内容.实验结果表明该方法能有效地剔除网页噪音并提取网页正文,具有较好的通用性和较高的准确性.     

运动竞赛焦虑研究之动态

介绍了国外有关运动竞赛焦虑研究的过去与现在，主要讨论与“倒Ｕ”型焦虑理论和多维度焦虑理论有关的研究动态，以及我国有关运动竞赛焦虑的现状，旨在使我国运动心理学工作者能了解当代运动心理学的研究现状，以便结合国内的实际开展研究。     

多秘密共享可视密码及在防止欺骗上的应用

本文将多秘密共享应用于可视密码,提出多秘密共享可视密码并将其实现,提出改进算法,证明其优越性,且对(2,n,n)多秘密共享可视密码进一步改进.最后指出两秘密共享可视密码可以非常好的应用于防止欺骗可视密码.     

Specific immune responses induced by a multi-epitope antigen of hepatitis C virus in mice and rabbits

Five highly conserved and immunogenic epitopes of hepatitis C virus (HCV) have been chosen to form a multi-epitope antigen gene and fused with β-galactosidase gene to express a hybrid GZ-PCX antigen, which could be specifically recognized by human HCV sera. High level of anti-GZ-PCX IgG has been induced when mice or rabbits were immunized with GZ-PCX antigen emulsificated with complete Freund’s adjuvant or mixed with killed attenuatedSalmonella typhimurium SL3261. The specific anti-GZ-PCX IgG reached a high titer of 10^-6, which remained for several months. Specific cytotoxic T lymphocyte (CTL) effects, delayed type hypersensitivity reaction (DTH) and proliferation of peripheral lymphocytes have been induced by GZ-PCX antigen or synthetic peptides. High level of anti-GZ-PCX slgG has been detected in mice’s intestinal washing fluids, which indicates that the antigen induced mucosal immunity as well as systematic immunity. The studies show that the HCV multi-epitope antigen induces high level of specific immune responses without obvious toxicity, which might be able to provide protectivity to any HCV genotypes and isolates.     

Gene Product Expression of Cyclin D2 and p16 During the Transition from Cardiac Myocyte Hyperplasia to Hypertrophy

The current study was to investigate mRNA expression of cyclin D2 and p16 during the transition from cardiac myocyte hyperplasia to hypertrophy. Cultured cardiac myocytes (CM) and fibroblasts (FC) obtained from 1-day-old Sparague-Dawley rats were used in this study. We have determined (1) hyperplasia by cell growth curve and fluorescence activated cell sorting (FACS); and (2) ultrastructure by electron microscope observation; and (3) expressions of cyclin D2 mRNA and p16 mRNA by using in situ hybridization and image analysis. The results were shown (1) Results of cell growth curve and FACS analysis showed CM could proliferate in the first 3 cultured days (4 days in postnatal development). But the ability decreased quickly, concomitant with the differentiation. (2) The ultrastructure of CM showed the large amount of myofilaments and mitochondrion and FC showed moderate amount of rough endoplasmic reticulum. (3) The expression of cyclin D2 mRNA in 3-, 4-, 5-day CM group was 0.89 times(p<0.05), 0.80 times (p<0.05)and 0.56 times (p<0.01)of that in 1-day group respectively. P16 mRNA in 2-, 3-, 4-, 5-day CM group were 1.63 times(p<0.01),1.72 times(p<0.01),1.99 times (p<0.01)and 2.84 times (p<0.01) of that in 1-day group respectively. It can be concluded that cultured neonatal rat cardiac myocytes could proliferate during the first 3 cultured days, but the ability of proliferation decreased, from the fourth day, concomitant with differentiation. Cyclin D2 and p16 have the key roles during the transition from myocyte hyperplasia to hypertrophy.     

以生物质快速裂解液制备酚醛树脂泡沫塑料

生物质资源经过快速裂解得到的液体生物油,是未来替代石油的重要资源之一。该文以木焦油为原料,采用萃取法提纯浓缩制得酚类物质质量分数超过85%的木杂酚,其主要成分为邻甲氧基苯酚、对甲基苯酚等。这些物质与甲醛有良好的反应性;进而用w=50%的木杂酚替代苯酚制备了木杂酚改性酚醛树脂泡沫塑料,经正交试验确定反应的最佳条件。研究表明,NaOH催化剂的用量是制备甲阶酚醛树脂的关键因素,同时必须采用硫酸为催化剂才能制得该树脂泡沫塑料。利用不同的催化剂用量和发泡工艺可调节泡沫塑料的力学性能。在最佳条件下,可制得泡孔直径200μm左右,压缩强度为1 003.8 kPa,压缩模量25.37 MPa的泡沫材料,达到了国家酚醛泡沫塑料相关标准的要求。     

基于个人创新性相对指标的修正微观决策创新扩散模型

针对微观决策的创新扩散模型的随机游走过程中,新信息传递的创新性能难以实际度量的问题,构建用于描述采纳时间先后顺序的个人创新性相对指标.借鉴Rogers依据采纳时间横向划分五类采纳人群的方法,明确个体所属的采纳类型,为不同类型的采纳者采取不同对策提供依据.以安全系统开发的创新扩散过程为实际应用案例,将人群按管理角色纵向划分为三类,对比分析每类管理角色的采纳时间特征,说明了个人创新性相对指标的应用方法,并通过实证研究验证其合理性.