虚拟存储技术在数字图书馆的应用研究

随着信息技术与网络技术的发展,虚拟存储已成为IT系统的核心。图书馆是网络技术和存储技术最大的受益者之一。虚拟存储技术在图书馆的应用无疑极大地推动了图书馆的建设与发展。本文简要介绍了虚拟存储的概念、虚拟存储的实现方式及其在数字图书馆的应用。     

个人云存储网站影响力评价体系构建研究

[目的/意义]个人云存储网站影响力的有效评价对用户选择云存储服务有着重要的参考作用,为个人云存储服务提供商改善网站设计质量提供方向。[方法/过程]通过整合WebQual 4.0模型和中国顾客满意度测评指标体系,并结合个人云存储功能特征,构建了个人云存储网站影响力评价指标体系,运用层次分析法计算各层级指标权重。选取典型个人云存储网站（百度网盘、腾讯微云、天翼网盘、115网盘）进行实证分析。[结果/结论]研究结果显示,对个人云存储网站影响力作用较大的指标主要包括：存储容量、有用性、高效分享、用户规模。百度网盘网站影响力最大,115网盘网站最小。未来个人云存储网站服务提供商应更加关注网站存储容量、有用性、高效分享及用户规模方面的提升。     

CloudChain: A novel distribution model for digital products based on supply chain principles

Cloud computing is a popular outsourcing solution for organizations to support the information management during the life cycle of digital information goods. However, outsourcing management with a public provider results in a lack of control over digital products, which could produce incidents such as data unavailability during service outages, violations of confidentiality and/or legal issues. This paper presents a novel distribution model of digital products inspired by lean supply chain principles called CloudChain, which has been designed to support the information management during digital product lifecycle. This model enables connected networks of customers, partners and organizations to conduct the stages of digital product lifecycle as value chains. Virtual distribution channels are created over cloud resources for applications of organizations to deliver digital products to applications of partners through a seamless information flow. A configurable packing and logistic service was developed to ensure confidentiality and privacy in the product delivery by using encrypted packs. A chain management architecture enables organizations to keep tighter control over their value chains, distribution channels and digital products. CloudChain software instances were integrated to an information management system of a space agency. In an experimental evaluation CloudChain prototype was evaluated in a private cloud where the feasibility of applying supply chain principles to the delivery of digital products in terms of efficiency, flexibility and security was revealed.     

基于Aleph500系统的低利用率文献高密度储存——以复旦大学图书馆为例

介绍复旦大学图书馆尝试将低利用率文献进行高密度储存来解决馆藏空间紧张问题,即以储存定位规则、建库过程管理、质量控制、读者服务为重点介绍基于Aleph500系统的本地分布式高密度储存书库的管理和服务模式。两年的运行实效表明,建立在本地的高密度储存书库并能以较经济的方式,提高现有馆舍储存实体馆藏的能力、缓解馆藏空间压力,实现资源长期保存和充分利用。
     

虚拟存储技术研究

虚拟存储是逻辑存储,是一种智能、有效地管理存储数据的方式.虚拟存储技术正逐步成为共享存储管理的主流技术.基于采用不同的系统结构实现存储虚拟功能,其完整性和容量水平均均有所差异.从系统的观点看,有三种主要的虚拟化存储方法：即基于网络的虚拟存储、基于存储设备的虚拟存储、基于主机的虚拟存储,而具体应用哪种方法,可以根据实际需求来决定.     

基于矩阵式遗传算法的集装箱码头堆场空间资源分配优化策略

为解决堆场空间资源配置问题(Storage Space Allocation Problem, SSAP),以箱区到泊位运输距离最小为目标,综合考虑岸桥、场桥等因素,提出一种基于矩阵式遗传算法(Matrix Genetic Algorithm, M-GA)的集装箱码头堆场空间资源分配优化策略.该方法首先建立基于装卸作业面的堆场空间资源分配模型;然后运用MGA求解扩展后的SSAP;最后分析不同遗传策略对遗传算法（Genetic Algorithm,GA)性能的影响,并以上海张华浜码头的案例验证该方法的优越性.     

一种科技服务资源虚拟化与存储访问方法

为促进科技资源的跨区域共享及便捷利用,研究了一种科技服务资源虚拟化与存储访问方法。提出包含信息服务/物理资源层、虚拟资源层和资源应用层的科技资源虚拟框架,定义了科技服务资源表示模型。结合科技服务资源的功能属性和非功能属性信息,给出科技服务资源的领域本体和语义定义。设计科技服务资源的统一存储模型,借助Ontop工具实现SPARQL语义查询。测试运行结果显示,构建的科技资源本体和存储模型语义查询正确。该科技资源虚拟框架分层合理,能够有效实现科技资源表达、本体构建和语义定义,且资源存储方法灵活、方便,可有效实现资源的语义查询。     

The influence of pre-warming on the physiological responses to prolonged intermittent exercise

To examine the influence of pre-warming on the physiological responses to prolonged intermittent exercise in ambient temperatures of 21.5?±?0.6°C and relative humidities of 35.7?±?5.4% (mean?±?s), six healthy men performed intermittent treadmill running (30-s bouts at 90% of maximal oxygen uptake separated by 30-s static recovery periods) to exhaustion after active pre-warming, passive pre-warming and pre-exercise rest (control). Exercise time to exhaustion was significantly different between all conditions (active, 51.8?±?7.2?min; passive, 38.5?±?11.1?min; control, 72.0?±?17.2?min; P <?0.05). These changes in performance time were closely associated with a significant decline in both the rate of heat storage and heat storage capacity (P <?0.05). Rectal temperature, heart rate and ratings of perceived exertion were significantly higher during exercise in the two pre-warming conditions than in the control condition (P <?0.05). Ratings of perceived exertion were also significantly higher during exercise following passive pre-warming compared with active pre-warming (P <?0.05). During exercise there were no significant differences in serum prolactin, plasma norepinephrine and plasma free fatty acid concentrations between conditions. We conclude that both active and passive pre-warming promote a reduction in prolonged intermittent exercise capacity in environmental temperatures of 21°C compared with pre-exercise rest. These performance decrements were dependent upon the mode of pre-warming and closely reflected alterations in body heat content.     

全球植被碳储量的时空格局动态

植被碳储量对生态系统碳平衡具有重要调节作用,对植被碳储量进行模拟并分析其对气候变化的响应是全球陆地生态系统碳循环和气候变化研究的重要内容.基于全球植被动态模型模拟的全球植被碳储量,分析植被碳储量在1901年-2000年间的时空变化趋势,及其与气温和降水的时空关系.将LPJ-DGVM (Lund-Potsdam-Jena Dynamic Global Vegetation Model)模型对植被碳储量的模拟结果与国际上被广泛接受的其他研究结果进行了对比后得出,该模型对植被碳储量具有较好的模拟能力.对植被碳储量的模拟结果表明:全球过去100年的植被碳储量在整体上呈增加趋势,增加率为0.0016kgC/(m2·a),通过分段线性回归方法得出植被碳储量时间变化趋势存在显著的转折点,20世纪50年代初以前,植被碳储量具有下降趋势,线性斜率为-0.0014kgC/(m2·a),之后植被碳储量呈现显著的增加趋势,增加率为0.0055kgC/(m2·a),是整体增加率的3倍多,因此整体增加率显著低估了近半个世纪以来植被碳储量的实际增加率.在空间栅格尺度上的分析表明,植被碳储量对气候变化的响应具有很大的区域差异,在不同地区,温度和降水的变化对植被碳储量的变化趋势贡献不同,并与各地区植物生长所受的环境条件约束的状况有关.研究结论进一步说明LPJ能够较好的模拟植物生长与气候之间的相关关系、揭示植被碳储量变化规律和特征,另外为了更好地研究气候变化对植被碳储量的影响,下一步需要对LPJ进行改进,增强其对人类活动如土地利用变化和农业灌溉行为等的模拟能力.     

关于一起110kV高压短路器合闸拒动事故的分析

为了研究某110kv变电站中旧式的110kV高压断路器合闸拒动事故的原因,分析了故障录波,开展了二次故障模拟,微机保护调试,蓄电池组维护等多项试验,最终得出此次事故的主要原因在于缺少对变电站蓄电池组进行日常维护,为了防止类似情况再次出现,总结出了一套较完善的蓄电池组维护方案,并该蓄电池组维护方案推广至公司所有的变电站,为整个电力公司电网安全运行多增加了一份保障。