网络弱点分析系统研究与设计

本文针对当前网络弱点扫描系统的局限性，提出了在弱点扫描系统基础上引入弱点分析的观点。结合Attack Tree、Attack Net等方法的优点，设计了一个合理的攻击描述模型，并应用于网络弱点扫描及分析系统，从而提高了它在安全评估领域的实用性。     

Genetic analysis of fruit shape traits at different maturation stages in sponge gourd

The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for fruit shape traits （fruit length and fruit perimeter） in sponge gourd was conducted by employing a developmental genetic model including fruit direct effects and maternal effects. Analysis approaches of unconditional and conditional variances were applied to evaluate the genetic behavior of fruit shape traits at economical and physiological maturation times. The results of variance analysis indicated that fruit length and fruit perimeter were simultaneously affected by fruit direct genetic effects and maternal effects. Fruit direct genetic effects were relatively more important for fruit shape traits at whole developmental period. The gene expression was most active at the economical maturation stage （1-12 d after flowering） for two shape traits, and the activation of gene was mostly due to direct dominance effects at physiological maturation stage （13-60 datter flowering）. The coefficients due to different genetic effects, as well as the phenotypic correlation coefficients, varied significantly between fruit shape traits themselves at various maturation stages. The results showed that it was relatively easy to improve fruit shape traits for industrial purpose by carefully selecting the parents at economical maturation stage instead of that at physiological maturation stage.     

影片《山楂树之恋》——一部无力的感时怀旧之作

在物欲横流的的大潮中,电影《山楂树之恋》被认为是历史上最干净的爱情,实际上是人们对往昔耶个纯真年代中纯粹感情的一点怀旧,一点感慨。舍弃了物欲情欲本身,干净的不是爱情本身,是人对爱情的想象,对纯粹爱情的向往。静秋本身是一种诗意化的存在,作为一个清纯的理想存存,反衬了现实中人们“爱”的无节制,实际上她不懂爱的意味。     

关于树的几个结果

树在图论研究以及复杂网络研究中常常用到.记号nd(G)表示图G中顶点度数为d的顶点的数目.本文利用树T的1度顶点个数可以由公式n1(T)=2+△(G)+D(G)n+1.对平面图G,它的面数(G)满足2(G)=4+d3Σ(d-2)n(dG).     

决策树算法中过度拟合的研究与解决方案

决策树算法广泛应用于模式识别和机器学习等领域,用来解决与分类相关的问题。决策树算法中的过度拟合会在很大程度上影响到最终的分类结果。针对过度拟合产生的原因,采用悲观错误剪枝方法,对学生成绩决策数据进行分析,得出影响学生成绩的重要因素。实验表明,该方法可以得到尽可能短的分类规则,有效地提高了决策树的性能。     

智能教学系统的自学习机制

本文主要介绍了智能教学系统中的机器自学习机制,研究如何提高智能教学系统的智能性和通用性等方面的问题。文章采用基于信息论的示例学习,改进了决策树学习算法,并建立了机器学习决策树。     

Functional characterization of an invertase inhibitor gene involved in sucrose metabolism in tomato fruit

In this study, we produced tomato plants overexpressing an invertase inhibitor gene (Sly-INH) from tomato, using a simple and efficient transient transformation system. Compared with control plants, the expression of Sly-INH was highly upregulated in Sly-INH overexpressing plants, as indicated by real-time polymerase chain reaction (PCR). Physiological analysis revealed that Sly-INH inhibited the activity of cell wall invertase (CWIN), which increased sugar accumulation in tomato fruit. Furthermore, Sly-INH mediated sucrose metabolism by regulating CWIN activity. Our results suggest that invertase activity is potentially regulated by the Sly-INH inhibitor at the post-translational level, and they demonstrate that the transient transformation system is an effective method for determining the functions of genes in tomato.     

改变与坚守——论康志刚的短篇小说集《香椿树》

康志刚的短篇小说集《香椿树》反映了作者20多年的创作历程,其三个阶段的创作总体来说是不断深入的:主题由清浅到深刻;叙事简洁有力,灵活多变;由表及里的底层小人物刻画;由细腻唯美到凌厉老到的语言。对康志刚而言,其创作始终不变的是对家园故土、国家民族的赤子般情怀。     

基于创新素质培养的“设施果树学”教学改革

“设施果树学”是一门应用性和实践性很强的特色课程,是果树反季节栽培能否成功的关键。为了提高课程的教学效果,提高学生的专业学习兴趣,培养学生分析问题和解决问题的能力,以满足社会对设施园艺人才的需求,根据课程特点,围绕课程现状、理论教学方法创新和教学内容的改革等方面进行了初步探讨,并通过案例进行课程思政教学。实践证明,学生的专业能力和探索能力都有了明显提高,很大程度上推动了“设施果树学”教学改革的发展。     

中国古代荔枝分类方法的研究——以福建省为中心

本文主要依据历代《荔枝谱》,结合地方志对古代福建省荔枝分类方式进行探讨。宋代蔡襄首次将本草系统中的上中下品分类法应用到荔枝分类中,但此方法未得到延续。然而淳熙《三山志》按记录来源的归类方式却对弘治《八闽通志》产生了影响,并促使其产生了几种分类方法,其中成熟期分类法在明末已经完善。本文深入分析早、晚熟荔枝类群,发现现代生物学实验显示荔枝聚类成因与成熟期具有一定的相关性;清代《广东新语》采取的生态分类法也与成熟期分类法有相通之处;且成熟期分类法能够很好地凸显火山荔枝、实生荔枝和其它栽培荔枝类群之间的差异。由此,本文认为传统时代中国荔枝分类学在明末达到了最高峰,且福建省功不可没。