排序方式: 共有120条查询结果,搜索用时 15 毫秒
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基于数据流的近似查询计算及其应用研究 总被引:2,自引:1,他引:2
通过分析基于实化聚集视图的查询重写方法,将相关的查询计算理论与数据流的查询相结合,针对数据流的特征,给出了一种具有广泛应用前景的基于数据流的近似查询计算方案。 相似文献
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数据挖掘语言研究现状及发展 总被引:1,自引:0,他引:1
论文介绍了目前比较流行的几种数据挖掘语言及其标准化方面的研究进展,比较分析了几种数据挖掘语言的优缺点,并对这几种数据挖掘语言的结构和组成进行了探讨和研究,最后探讨了数据挖掘语言的发展趋势,以及需要解决的问题。 相似文献
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一般的锁操作中Lock和Unlock语句需作为原语整体实施,即主要要求加锁的锁状态检查和加锁动作不可中断,与一般的锁操作法不同,本文给出一个可以处处被其他进程任意中断的锁操作Lock和Unlock的算法,并通过其在异构数据库系统中的一个应用,阐明了它在实现互斥操作和并发控制等方面的实用价值。 相似文献
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使用XSL实现XML到VML的转换 总被引:5,自引:0,他引:5
简要介绍了VML、XML和XSL这三种标记语言,提出了使用XSL把XML转换成VML的一种方法.该方法比较灵活而且效率比较高.还阐述了这种方法的一种应用,即实现数据到图形的转换.通过这种转换,可以满足多种报表的格式要求,而且转换效率也比较高. 相似文献
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Streaming media data have strict delay and loss requirements, which cannot be adequately supported by the current Internet. Proxy caching technology is introduced to alleviate the effect of the bottleneck bandwidth on the transporting quality. A new architecture of multimedia proxy caching is given to solve the problem of the traditional Web caching technology for the multimedia streaming. The mixed media management module and the resource management module are added to this architecture, the prefetching and replacement method is studied considering the characteristics of streaming media data, the concept of weighed popularity is given to enhance the exactness of the replacement algorithm. 相似文献
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In order to solve the problems associated with Internet IP services management, a generic service model for n multi-providcr IP service management is proposed, which is based on a generalization of the bandwidth broker idea introduced in the differentiated services (DiffServ) environment. This model consists of a hierarchy of service brokers, which makes it fit into providing end-to-end Internet services with QoS support. A simple and sealable mechanism is used to communicate with other cooperative domains to enable customers to dynamically setup services connections over multiple DiffServ domains. The simulation results show that the proposed model is real-time, which can deal with many flow requests in a short period of time, so that it is fit for the service management in a reasonably large network. 相似文献
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XML文档结构定义规范-XML Schema 总被引:14,自引:2,他引:14
介绍了XML文档结构定义规范-XML Schema 规范及其组成部分,并通过一个典型示例说明了XML Schema的特点,对XML Schema应用及前景作了预测。 相似文献
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串行通信协议的研究及应用 总被引:12,自引:1,他引:12
综合串口设备的特点及应用背景,提出一套通用的计算机串行通信软件设计方案,包括难点解决及算法与协议,并给出了若干应用实例。 相似文献
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