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File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and
rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information
about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research
community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this
information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these
factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This
article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate
vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends
on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both
files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness
of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of
identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model
leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing
factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated
into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled
optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results
show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40%
when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy. 相似文献
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针对雨季施工的特点,对雨季施工存在的主要问题进行探讨和分析,以做好防范和控制工作,确保工程正常进行。 相似文献
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"制冷原理及设备"课程是能源与环境系统工程专业的一门专业特色课程。该课程既有深厚的专业理论基础知识,又有很强的工程应用。从教学大纲制定、教学组织与实施、实践教学环节等几方面对该课程的教学方法进行了探讨。实践表明,合适教材的选用、课堂教学以及实践教学的精心组织有利于学生对本课程的理解掌握。 相似文献
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随着经济的迅速发展,人民的生活水平的迅速提高,群众的文化娱乐生活日渐丰富。体育舞蹈事业经1987年进入中国以来,经过二十多年的发展,已基本形成了广泛的群众基础,并形成了一定的市场基础。体育舞蹈的市场化水平也在不断深化。该文立足我国体育舞蹈比赛商业运作的发展现状,指出体育舞蹈商业化运作的发展动力,并提出一些促进体育舞蹈市场化运作的建议,希望能为体育舞蹈市场化模式的建立提供有益经验,以促进我国体育舞蹈事业的健康发展。 相似文献
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提出了一种针对风光互补发电系统中BUCK电路的稳压方法,利用SG3525芯片的闭环控制调节,可输出精确度高、稳定性好、动态响应快的直流电压.仿真结果表明,符合风光互补发电设备的要求. 相似文献
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以福建体育职业技术学院毕业生为调查对象,对体育高职毕业生的就业心理、影响毕业生就业的主要因素以及体育高职毕业生的素质能力等问题作了全面了解,就业情况调查为进一步推进体育高职院校毕业生就业制度改革和改善学院就业指导工作提供决策依据;为进一步改善学院教学管理、学生管理和行政管理、课程的设置等提供参考意见。 相似文献
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以福建体育职业技术学院毕业生为调查对象,对体育高职毕业生的就业心理、影响毕业生就业的主要因素以及体育高职毕业生的素质能力等问题作了全面了解,就业情况调查为进一步推进体育高职院校毕业生就业制度改革和改善学院就业指导工作提供决策依据;为进一步改善学院教学管理、学生管理和行政管理、课程的设置等提供参考意见。 相似文献
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夏鹏 《时事(时事报告高中版)》2006,(2)
新闻背景:山东海化集团,是全国最大的海洋化工生产和出口基地。尽管守着大海,海化集团仍自觉运用循环经济理念,实现了“一水六用”。即用海水放养贝类、鱼虾等海产品;海水蒸发后的初级卤水放牧卤虫;中级卤水先送纯碱厂、硫酸钾厂供工艺冷却;在工艺冷却过程中吸收了化工废热的中级卤水送 相似文献
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要满足知识经济、企业对人才的需求,同时解决大学生就业难的难题,高校应当努力培养与企业接轨的人才,积极帮助大学生创造与企业接轨的就业力。对就业力内涵加以分析,归纳就业力包含的核心要素,可为高校培养大学生核心就业力给出有针对性的策略建议。 相似文献