FARMER: A novel approach to file access correlation mining and evaluation reference model     

夏鹏  冯丹  王芳 《上海大学学报(英文版)》2011,15(6):574-588

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   

武汉钢材流通业信息化三步战略     

朱汉民  蒋杰 《武汉工程职业技术学院学报》2006,18(1):70-74

通过对2004年至2005年武汉4个主要钢材仓储货场的考察，结合武钢集团销售模式和钢铁物流的特点，剖析了货场运作中的弊病，并提出了三步走的改造方案。最后对武汉钢铁流通产业的未来格局作了分析展望。  相似文献   

论县市级图书馆的数字化建设和服务     

吴兆江 《娄底师专学报》2006,(3):189-191

从图书馆计算机自动化网络的建设、数据库的建设、信息咨询服务三个方面全面论述现代数字化图书馆的建设和服务，详细探讨了地方特色数据库的建设，讨论了县市级图书馆有自身特点的信息咨询服务的形成。  相似文献   

拌和场对沥青罐及加热设备的选用     

耿宏杰  郭淑海 《石家庄铁路工程职业技术学院学报》2007,(4)

在沥青混凝土的生产过程中,沥青混凝土搅拌系统中的沥青罐(即沥青储罐和沥青高温罐)和导热油加热调和与合理使用,是降低投资成本和提高设备经济效益的关键。拟以沥青混凝土拌和场日工NBD160型沥青混凝土搅拌设备为例,说明如何合理选配沥青罐及加热设备。  相似文献   

基于SRP构建IP SAN安全认证机制     

何玲娜  侯向辉  史烈 《宁波广播电视大学学报》2006,4(2):108-110

海量数据的分布式存储是近几年的研究热点,随着数据量的不断增大,如何确保数据存储的安全性是极需解决的技术问题。本文构建了一种SAN存储网络的安全认证模型,利用SRP机制实现了分布式数据存储的认证,有效地确保了数据的安全性和一致性。  相似文献   

图书馆磁盘阵列技术的需求分析     

刘迅芳 《石家庄铁路职业技术学院学报》2005,4(3):105-107

介绍磁盘阵列技术，详细分析图书馆对磁盘阵列的需求，提出图书馆选用磁盘阵列时应考虑的因素。  相似文献   

Hypocholesterolemic and hepatoprotective effects of flaxseed chutney: Evidence from animal studies     

K. A. Faseehuddin Shakir  Basavaraj Madhusudhan 《Indian journal of clinical biochemistry : IJCB》2007,22(1):117-121

Rats fed with hypercholesterolemic diet showed a significant increase in serum total—cholesterol, liver homogenate total-cholesterol, HDL-cholesterol and changed LDL-cholesterol, and HDL/LDL ratio in comparison to control. Flaxseedchutney (FC) supplemented diet (15%, w/w) was found to be more effective in restoring lipid profile changes in rats fed with cholesterol, (1.0%). The activities of serum marker enzymes glutamate oxaloacetate transminase (GOT), glutamate pyruvate transaminase (GPT) and alkaline phosphatase (ALP) were elevated significantly in carbon tetrachloride induced rats. Administration of flaxseedchutney (15%, w/w) resulted in depletion of serum marker enzymes and exhibited recoupment thus showing significant hepatoprotective effect. It was observed that flaxseedchutney supplemented diet could lower the serum cholesterol and as a potential source of antioxidants it could exert protection against hepatotoxic damage induced by carbon tetrachloride (CCl₄) in rats.  相似文献   

校企科技成果转化是否需要政府的介入?——基于EOQ存储模型视角     

苏世彬  李苹 《科技管理研究》2019,39(5)

本文针对校企科技成果转化是否需要政府介入、政府如何介入提出了两个研究假设,基于EOQ存储模型视角对这两个假设进行了验证；并运用数据描述和malmquist指数两种方法对理论成果进行实证；最后得出了本文的两个创新点及未来研究方向。  相似文献   

镁基储氢合金材料的性能及研究进展     

吴睿  陈用娇  周礼玮  韦小凤 《大众科技》2016,(7):49-52

由于资源丰富,储氢容量较高,价格低廉,应用前景广阔等特点,镁基储氢合金材料成为近年来研究的热点,然而其稳定的热力学性和缓慢的动力学性限制了它的应用,因而对镁基储氢合金材料的改性日益成为了镁基储氢合金发展的重要方向,文章对镁基储氢合金材料的性能及改性方法进行了综述,并对其发展趋势进行了展望。  相似文献   

选课管理系统核心技术的研究与实现     

薛洲恩  李进豪 《北京工业职业技术学院学报》2007,6(1):22-24

在基于WEB集成技术的前提下,文章主要分析了职业技术院校选课管理系统核心技术的实现方案,重点讨论系统的开发思想、数据存储和数据交换、选课核心算法及系统的安全性等.  相似文献