云计算背景下的数字档案馆建设与服务

互联网技术中云计算的出现,对数字档案馆建设与服务方面产生极大的影响.云计算应用于数字档案馆建设以后,极大地方便了人们使用信息的储存与查阅功能.然而在这个过程中也出现了一些新的问题.本文从云计算的概念与功能以及数字档案馆的基本含义出发,结合云计算的实际运用谈论关于数字档案馆的建设与服务.     

Evaluation of the antioxidant effects of four main theaflavin derivatives through chemiluminescence and DNA damage analyses

Theaflavins (TFs) are the dimers of a couple of epimerized catechins, which are specially formed during black tea fermentation. To explore the differences among four main TF derivatives (theaflavin (TF₁), theaflavin-3-gallate (TF₂A), theaflavin-3′-gallate (TF₂B), and theaflavin-3,3′-digallate (TF₃)) in scavenging reactive oxygen species (ROS) in vitro, their properties of inhibiting superoxide, singlet oxygen, hydrogen peroxide, and the hydroxyl radical, and their effects on hydroxyl radical-induced DNA oxidative damage were systematically analyzed in the present study. The results show that, compared with (−)-epigallocatechin gallate (EGCG), TF derivatives were good antioxidants for scavenging ROS and preventing the hydroxyl radical-induced DNA damage in vitro. TF₃ was the most positive in scavenging hydrogen peroxide and hydroxyl radical, and TF₁ suppressed superoxide. Positive antioxidant capacities of TF₂B on singlet oxygen, hydrogen peroxide, hydroxyl radical, and the hydroxyl radical-induced DNA damage in vitro were found. The differences between the antioxidant capacities of four main TF derivatives in relation to their chemical structures were also discussed. We suggest that these activity differences among TF derivatives would be beneficial to scavenge different ROS with therapeutic potential.     

Eucalyptus中基于能量消耗的调度算法研究

能量消耗是云计算研究中一个十分重要的问题,介绍了开源云项目Eucalyptus,分析了其核心调度算法及在考虑能量消耗的应用场景中存在的问题,利用虚拟机在线迁移技术提出了基于能量消耗的调度算法。实验证明,基于能量消耗的调度算法性能优于Eucalyptus现有的核心调度算法。最后总结了需要进一步提高的方面。     

蝴蝶不同部位提取DNA效果的研究

提取高质量的蝴蝶基因组是蝶类分子系统学研究的重要步骤。本文通过对蝴蝶干标本不同部位DNA提取效果的比较,找出了最适合蝴蝶干标本基因组DNA提取的部位,同时用PCR扩增的方法进行了检验,力争为开展蝴蝶的分子生物学研究奠定基础。结果表明,足部的提取效果最佳。     

基于百度PCS实施SaaS架构的应用分析

发挥云计算平台开发应用系统高效率、低成本的优势,基于云计算平台部署应用系统是实施SaaS（Software-as-a-Service软件即服务）架构企业应用系统的最佳模式。为探索基于百度个人云存储PCS（Personal Cloud Storage）平台的企业SaaS应用系统开发问题,文章分析了基于百度PCS实施应用系统SaaS架构的功能优势,在此基础上,结合Android开发环境探讨基于PCS的SaaS架构的集成开发方法,利用PCS所提供的SDK（Software Development Kit）,给出了实现结构化数据处理的云存储解决方案。     

The effect of online co-regulated learning in the implementation of team-based learning on improving students’ involvement

Many education institutions and teachers are recognizing and applying online learning and related educational technologies to help students achieve satisfactory learning performance. Due to the free entertainment on the Internet that may distract students’ attention from online courses and with the purpose of developing students’ teamwork abilities, the author in this study adopted team-based learning (TBL) and co-regulated learning (CRL) to develop students’ involvement in a blended computing course. The subjects in this study were 111 first-year students from three classes taking a compulsory course titled ‘Applied information technology: data processing’. The first group (G1, which received online TBL and CRL) and the second group (G2, which received online TBL only) were the experimental groups. The last group (CG), which received the traditional teaching method in a blended learning environment, served as the control group. The results in this study indicate that students who receive the online TBL have significantly higher involvement than those without. However, the online CRL does not contribute to better development of students’ involvement in the implementation of TBL. The insights for teachers who plan to adopt e-learning, and the reasons for the ineffectiveness of CRL, are discussed in this study.     

商业生态系统视角下的云计算经济发展模式研究

云计算经济是伴随云计算的产生和发展而兴起的,对其发展模式的研究目前还是一个新的领域。从商业生态的视角对云计算经济发展模式进行研究,首先借鉴商业生态系统的研究成果,设计出云计算经济商业生态系统的结构模型,根据商业生态系统的特征提出云计算经济商业生态系统发展动力机制;最后根据商业生态系统结构特征和逻辑斯蒂增长模型设计商业生态下云计算经济发展的理论模型和数学模型。     

云计算环境下移动图书馆系统设计与构建

指出云计算带来了IT架构的革命性变化,云计算模式的应用将从根本上改变图书馆服务理念、信息获取与保存方式,移动图书馆成为现代数字图书馆信息服务的一种崭新服务系统。设计与构建了一个基于WAP的移动图书馆系统模型。     

论图书馆大数据在读者决策采购中的应用

阐述读者决策采购是图书馆未来电子资源采购的重要模式,提出大数据将给图书馆个性化读者决策采购带来新的发展机遇,同时就如何将大数据应用到图书馆读者决策采购中提出建议并解决方案.     

基于云计算的政府门户网站知识管理研究

政府门户网站是电子政务服务的窗口。云计算为政府门户网站的知识管理提供了强大的技术工具。本文阐述了云环境下,政府门户网站知识管理的意义,重点论述了政府门户网站知识管理的过程和保障策略。