湘西凤凰苗族哭嫁歌音乐艺术特征探析

流行于湘西凤凰苗族哭嫁歌是苗族人民劳动和智慧的结晶,也是苗族婚俗文化的重要组成部分,它具有鲜明的民族和地方特色。本文主要从对哭嫁歌的旋律、曲调、演唱特征、艺术价值进行了一定的解析,并在此基础上总结其音乐美学意义,以此引起人们的关注,更好的促进苗族文化的发展。     

基于不平衡数据集的决策树算法

为了使决策树健壮,我们从描述信息增益开始,关于这个规则的置信度,使用C4.5作为度量。这可以使我们快速的解释为什么信息增益,象置信度,偏重大多数类的规则的结果。为了克服这种偏见,我们介绍一种新度量,类置信度比例（CCP）,它是CCPDT（类置信度比例决策树）形成的基础。这两种变化在一起产生一个分类器,它不仅比传统的决策树,而且比著名的平衡取样技术学习树能更好的完成统计。     

嵌入式数据库SQLite中B树的研究

本文重点描述了开源嵌入式数据库SQLite对数据的组织方法和其中B树页的结构,并对利用SQLite建立的数据库文件进行了的设计。在此基础之上,进一步对SQLite中实现此部分的程序代码进行了更深入的分析。最后利用SQLite中提供的接口函数完成了对红-黑树的操作程序,实现了在数据库中对B树的应用,完成了对该数据库的优化。     

树先生：超现实主义的想象性胜利

论述了电影（（hello!树先生》前后两部分截然不同的艺术风格,指出其前半部分属于贾樟柯式的纪0’T实风格,而后半部分则进入了超现实主义式的虚幻风格。（hello!树先生》由此展现了一种对于现实的想象性胜利。     

Fungal diversity in adult date palm (Phoenix dactylifera L.) revealed by culture-dependent and culture-independent approaches

Endophytic flora plays a vital role in the colonization and survival of host plants, especially in harsh environments, such as arid regions. This flora may, however, contain pathogenic species responsible for various troublesome host diseases. The present study is aimed at investigating the diversity of both cultivable and non-cultivable endophytic fungal floras in the internal tissues (roots and leaves) of Tunisian date palm trees (Phoenix dactylifera). Accordingly, 13 isolates from both root and leaf samples, exhibiting distinct colony morphology, were selected from potato dextrose agar (PDA) medium and identified by a sequence match search wherein their 18S–28S internal transcribed spacer (ITS) sequences were compared to those available in public databases. These findings revealed that the cultivable root and leaf isolates fell into two groups, namely Nectriaceae and Pleosporaceae. Additionally, total DNA from palm roots and leaves was further extracted and ITS fragments were amplified. Restriction fragment length polymorphism (RFLP) analysis of the ITS from 200 fungal clones (leaves: 100; roots: 100) using HaeIII restriction enzyme revealed 13 distinct patterns that were further sequenced and led to the identification of Alternaria, Cladosporium, Davidiella (Cladosporium teleomorph), Pythium, Curvularia, and uncharacterized fungal endophytes. Both approaches confirmed that while the roots were predominantly colonized by Fusaria (members of the Nectriaceae family), the leaves were essentially colonized by Alternaria (members of the Pleosporaceae family). Overall, the findings of the present study constitute, to the authors’ knowledge, the first extensive report on the diversity of endophytic fungal flora associated with date palm trees (P. dactylifera).     

Using Decision Tree Analysis to Understand Foundation Science Student Performance. Insight Gained at One South African University

The Foundation Programme of the Centre for Science Access at the University of KwaZulu-Natal, South Africa provides access to tertiary science studies to educationally disadvantaged students who do not meet formal faculty entrance requirements. The low number of students proceeding from the programme into mainstream is of concern, particularly given the national imperative to increase participation and levels of performance in tertiary-level science. An attempt was made to understand foundation student performance in a campus of this university, with the view to identifying challenges and opportunities for remediation in the curriculum and processes of selection into the programme. A classification and regression tree analysis was used to identify which variables best described student performance. The explanatory variables included biographical and school-history data, performance in selection tests, and socio-economic data pertaining to their year in the programme. The results illustrate the prognostic reliability of the model used to select students, raise concerns about the inefficiency of school performance indicators as a measure of students' academic potential in the Foundation Programme, and highlight the importance of accommodation arrangements and financial support for student success in their access year.     

企业R&D预算分配的“研发树”模型

为解决企业对R&D资金在不同项目之间的分配问题,在研究和借鉴以往决策方法的基础上,构建了适用于大型高科技企业R&D资金分配的"研发树"模型。该方法使R&D预算系统既实现了宏观上的指导功能,又具有微观上的资金控制和配置功能。     

"问题树分析法"--区域发展研究的有效分析方法

本介绍了问题树分析法的概念,理论要点,特点,分析步骤,模型结构及在区域发展研究中的重要性。并结合具体实例,探讨了在区域发展规划中如何应用该方法来发现问题,分析问题之间的相互关系,有针对性地对区域发展作出总体规划与决策。     

决策树分类算法研究综述

本文基于决策树分类算法的研究现状,重点介绍了一些极具代表性的算法,包括ID3、C4.5等,对各种决策树分类算法的基本思想进行阐述,分析比较各种典型算法的优点和不足,并对决策树分类算法所面临的问题进行了简要的阐述,为数据分类研究者提供借鉴。     

校园网常用网络安全技术

通过一些常用的网络安全技术来使得校园网更快,更健壮,更方便管理。本文列出了一些常用协议的作用及配置方法,如拓扑图、验证命令。