检索结果-内蒙古大学图书馆

ZX: A network file system for high-latency networks

SOFTWARE-PRACTICE & EXPERIENCE 2018年第3期48卷 578-599页

作者： Ballesteros, Francisco J. Guardiola, Gorka Soriano, Enrique Univ Rey Juan Carlos Dept Sistemas Telemat & Computac GSyC Lab Sistemas LSUB Madrid Spain

Using a central file server is good for interactive access to files, because of the coherency implied by a centralized design. In fact, within local area networks, this is a common case. However, distributed environments in use today may exhibit round-trip times on the order of 50 or 100 ms. This is a problem for interactive file access to a central file server because of the resulting access times. Although aggressive caching and loosely synchronized replicas may be used for distributed file access, there are cases where the better coherency provided by a central server is still desirable. In this paper, we present ZX, a distributed file system and protocol designed with latency in mind. It can use caching, but it does not require caching or batching to address latency issues. ZX relies on a novel channel-based file system interface. It includes find requests and leverages streaming requests to work well under high-latency conditions. Unlike other protocols designed for distributed access to a central server, ZX tolerates round-trip times on the order of 50 or 100 ms to access a central file server for interactive usage such as compiling shared sources, running binaries, editing documents, and other similar workloads. It can be used on UNIX using a FUSE adaptor while permitting native ZX speakers to run faster.

关键词： cloud computing network file system operating system

来源：评论

学校读者我要写书评

暂无评论

WSNFS: A web-services-based network file system

引用

JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 2008年第3期24卷 933-947页

作者： Hwang, Gwan-Hwan Yu, Chih-Hao Sy, Chun-Chin Chang, Chiu-Yang Natl Taiwan Normal Univ Dept Comp Sci & Informat Engn Taipei 106 Taiwan Inst Informat Ind Networks & Multimedia Inst Taipei 106 Taiwan Natl United Univ Dept Elect Engn Miaoli 360 Taiwan

Web services are Web-based enterprise applications that use open, XML-based standards and transport protocols to exchange data between calling clients and servers. In this paper, we demonstrate that Web services can be used to construct a distributed file system, called the Web-services-based network file system (WSNFS). One of the goals of the WSNFS is to provide a platform for file sharing among heterogeneous distributed file systems. Also, as the technology of Web services is widely applied to the field of grid Computing, the proposed system can aid the deployment of Web services to the data grid applications. We present the architecture of the WSNFS and define the communication-protocol standard based on Web services. Our experiences in implementing the prototype as well as the experimental results demonstrate that the practicality of the WSNFS;the performance of the prototype is comparable to that of the Sun network file system.

关键词： distributed file system network file system web services XML SOAP

来源：评论

学校读者我要写书评

暂无评论

A scalable bandwidth guaranteed distributed continuous media file system using network attached autonomous disks

引用

IEEE TRANSACTIONS ON MULTIMEDIA 2003年第1期5卷 71-96页

作者： Akinlar, C Mukherjee, S Univ Maryland Dept Comp Sci College Pk MD 20742 USA Panason Technol Inc Princeton NJ 08540 USA

Repository for continous media data differs from that of the traditional text-based data both in storage space and streaming bandwidth requirements. The file systems used for continuous media streams need to support large volumes and high bandwidth. In this paper, we propose a novel scalable distributed continuous media file system built using autonomous disks. Autonomous disks are attached directly to the network and are able to perform lightweight processing. We discuss different ways to realize the autonomous disk, and describe a prototype implementation on Linux platform using PC-based hardware. We present the basic requirements of the continuous media file system and present the design methodology and a prototype Linux-based implementation of the distributed file system that supports the requirements. We present experimental results on the performance of the proposed file system prototyped using autonomous disks. We show that the performance of the file system scales linearly with the number of disks and the number of clients. The file system performs much superior to NFS running on the same hardware platform and can deliver higher raw disk bandwidth to the applications. We also present bandwidth and time sensitive read/write procedures for the file system and show that the file system can provide strict bandwidth guarantees for continuous media streams.

关键词： distributed file system file system Linux operating system network and disk scheduling network attached storage devices network file system quality of service

来源：评论

学校读者我要写书评

暂无评论

A scalable distributed multimedia file system using network attached autonomous disks 8

A scalable distributed multimedia file system using network ...

引用

8th International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication systems

作者： Akinlar, C Mukherjee, S Univ Maryland Dept Comp Sci College Pk MD 20742 USA

ISBN: (纸本)076950728X

Repository for multimedia data differs from that of the traditional text-based data both in storage space and streaming bandwidth requirements. The file systems used in multimedia environment need to support large volumes and high bandwidth. In this paper, we propose a novel scalable distributed file system built using Autonomous Disks. Autonomous disks are attached directly to the network and are able to perform lightweight processing. We discuss different ways to realize autonomous disk, and describe a prototype implementation on Linux platform using PC-based hardware. We present the design methodology and a prototype Linux-based implementation of the distributed file system that supports them We detail experimental results on the performance of the proposed file system prototyped using autonomous disks. We show that the performance of the fire system scales linearly with the number of disks and the number of clients. The file system performs much superior to NFS running on the same hardware platform and ran deliver higher raw disk bandwidth to the applications. We also show that the file system can provide strict bandwidth guarantees for multimedia streams.

关键词： file system distributed file system network file system network attached storage devices linux operating system quality of service network and disk scheduling

来源：评论

学校读者我要写书评

暂无评论

Scalable network file systems with load balancing and fault tolerance for web services

引用

JOURNAL OF systemS AND SOFTWARE 2014年 93卷 102-109页

作者： Chang, Hsien-Tsung Chang, Yi-Min Hsiao, Sheng-Yuan Chang Gung Univ Fac Comp Sci Taoyuan Taiwan Chang Gung Univ Dept Informat Engn Taoyuan Taiwan Chang Gung Univ Taoyuan Taiwan

Because of the rapid growth of the World Wide Web and the popularization of smart phones, tablets and personal computers, the number of web service users is increasing rapidly. As a result, large web services require additional disk space, and the required disk space increases with the number of web service users. Therefore, it is important to design and implement a powerful network file system for large web service providers. In this paper, we present three design issues for scalable network file systems. We use a variable number of objects within a bucket to decrease internal fragmentation in small files. We also propose a free space and access load-balancing mechanism to balance overall loading on the bucket servers. Finally, we propose a mechanism for caching frequently accessed data to lower the total disk I/O. These proposed mechanisms can effectively improve scalable network file system performance for large web services. (C) 2014 Elsevier Inc. All rights reserved.

关键词： Load balancing Fault tolerance network file system

来源：评论

学校读者我要写书评

暂无评论

Working Set-Based Access Control for network file systems 09

Working Set-Based Access Control for Network File Systems

引用

14th ACM Symposium on Access Control Models and Technologies

作者： Smaldone, Stephen Ganapathy, Vinod Iftode, Liviu Rutgers The State University of New Jersey Piscataway NJ USA

ISBN: (纸本)9781605585376

Securing access to files is an important and growing concern in corporate environments. Employees are increasingly accessing files from untrusted devices, including personal home computers and mobile devices, such as smart phones, which are not under the control of the corporation, and may be infected with viruses, worms, and other malware. In such cases, it is crucial to protect the confidentiality and integrity of corporate data from malicious accesses. This paper proposes a novel scheme called Working Set-Based Access Control (WSBAC) to restrict network file system accesses from untrusted devices. The key idea is to continuously observe and extract working sets for users when they access files from trusted devices and use the working sets to restrict user file accesses from untrusted devices. This paper reports on the design and implementation of tools to automatically extract working sets, and transparently enforce WSBAC without requiring changes to the file system. Our experiments with realistic network file system traces lead us to conclude that WSBAC offers a flexible yet secure way to restrict access from untrusted devices, and that the runtime overheads of WSBAC enforcement are negligible.

关键词： access control working set network file system

来源：评论

学校读者我要写书评

暂无评论

Load Balancing and Fault-Tolerance for Scalable network file systems Using by Web Services

Load Balancing and Fault-Tolerance for Scalable Network File...

引用

13th WSEAS International Conference on Computers

作者： Chang, Hsien-Tsung Chang Gung Univ 259 Wenhua 1st Rd Guishan Shiang 333 Taoyuan County Taiwan

ISBN: (纸本)9789604740994

Due to the rapid growth of World Wide Web and the popularization of personal computer, the number of World Wide Web users is increasing in an incredible speed. It makes the need of disk space for a large web service also increases in the same rate. Therefore, it becomes to an important technique to design and implement a powerful network file system for the large web service providers. In this paper we proposed three design issues for the scalable network file system. We use the variable number of objects within a bucket to decrease the internal fragmentation in small files. We also proposed the free space and access load-balancing mechanism to balance the overall loading within the bucket servers. And last we proposed a mechanism for caching data which is frequently accessed to lower the total number of disk I/O. These proposed mechanisms will effectively improve the performance of the scalable network file system for the large web services.

关键词： Storage network file system Fault-Tolerance Load Balancing

来源：评论

学校读者我要写书评

暂无评论

Differential Endosomal Pathways for Radically Modified Peptide Vectors

引用

BIOCONJUGATE CHEMISTRY 2013年第10期24卷 1721-1732页

作者： Arukuusk, Piret Paernaste, Ly Margus, Helerin Eriksson, N. K. Jonas Vasconcelos, Luis Padari, Kaert Pooga, Margus Langel, Ulo Univ Tartu Inst Technol Lab Mol Biotechnol EE-50411 Tartu Estonia Univ Tartu Inst Mol & Cell Biol Dept Dev Biol EE-51010 Tartu Estonia Stockholm Univ Dept Neurochem Arrhenius Labs Nat Sci SE-10691 Stockholm Sweden

In the current work we characterize the uptake mechanism of two NickFect family members, NF51 and NF1, related to the biological activity of transfected plasmid DNA (pDNA). Both vectors condense pDNA into small negatively charged nanoparticles that transfect He La cells with equally high efficacy and the delivery is mediated by SCARA3 and SCARA.5 receptors. NF1 condenses DNA into less homogeneous and less stable nanoparticles than NF51. NF51/pDNA nanoparticles enter the cells via macropinocytosis, while NF1/pDNA complexes use clathrin- or caveolae-mediated endocytosis and macropinocytosis. Analysis of separated endosomal compartments uncovered lysomotropic properties of NF51 that was also proven by cotransfection with chloroquine. In summary we characterize how radical modifications in peptides, such as introducing a kink in the structure of NF51 or including extra negative charge by phospho-tyrosine substitution in NF1, resulted in equally high efficacy for gene delivery, although this efficacy is achieved by using differential transfection pathways.

关键词： uptake mechanisms negative charge Genetic Therapy Nanoparticles Chloroquine Gene transfer Obstetric Delivery Peptides Clathrin SCARA3 gene Biological activity network file system

来源：评论

学校读者我要写书评

暂无评论

High-performance internet file system based on multi-download for convergence computing in mobile communication systems

引用

CLUSTER COMPUTING-THE JOURNAL OF networkS SOFTWARE TOOLS AND APPLICATIONS 2019年第4期22卷 1057-1071页

作者： Moon, Youngjun Kim, Seokhoon Ryoo, Intae Kyung Hee Univ Dept Comp Engn Seoul South Korea Soonchunhyang Univ Dept Comp Software Engn Asan South Korea

This paper proposes the Enhanced Internet file system (EIFS), of which the structure consists of a data manager, disk cache, and multi-download module, to improve the performance of the Common Internet file system (CIFS) and presents an evaluation of its performance. The data manager manages data by changing the page unit size used by the local file system from 4 KB to 1 MB. The multi-download module improves the transfer speed by dividing one file into 1-MB sections, which it then simultaneously downloads to multiple sessions. In addition, the disk cache uses internal memory as a cache to manage the data received from the network and also stores data in the cloud in the form of a virtual image, caching only the file pages requested by the application. The proposed EIFS speeds up the downloading of one file by concatenating two or three sessions for processing at the same time. As EIFS supports VFS and conforms to the POSIX standard, it can be used on multiple systems. The performance of EIFS was evaluated by measuring the download speed and app execution time in a mobile network environment. The test results showed that the file download speed increases for EIFS 2 (two sessions) and EIFS 3 (three sessions) compared to CIFS. The performance evaluations further show that the proposed technique outperforms the CIFS file system in terms of download speed and application execution time.

关键词： CIFS NFS network file system Multi download Disk cache

来源：评论

学校读者我要写书评

暂无评论

Characteristics of L-band transmissivity and effective scattering albedo of boreal forests: a case study in northeast China

引用

REMOTE SENSING LETTERS 2017年第12期8卷 1200-1209页

作者： Zheng, Xingming Li, Xiaofeng Jin, Mengjie Jiang, Tao Zhao, Kai Chinese Acad Sci Northeast Inst Geog & Agroecol Changchun Jilin Peoples R China Chinese Acad Sci Changchun Jingyuetan Remote Sensing Test Site Changchun Jilin Peoples R China

Modeling of forest transmissivity (t(F)), or nadir optical depth (n(F)), and effective scattering albedo (omega(F)) of L-band radiometer, helps to reduce the uncertainty in retrieved forest soil parameters. To address this issue, the L-band downward brightness temperatures of boreal forests in Northeast China were observed. Forest t(F) (or n(F)) and omega(F) were derived from in-situ soil parameters and observed forest brightness temperature by combining the advanced integral equation model (AIEM), the zero-order radiative transfer model (tau omega), and a genetic algorithm (GA). Some conclusions about forest radiative transfer properties are revealed here: 1) t(F) is nearly 0.3 higher in summer than in winter, and this seasonal difference in tF is bigger than was previously thought. Next to the difference in the amount of leaves present, air temperature might be an important factor influencing this seasonal variation in t(F). 2) A moderate dependence of n(F) on polarization exists. 3) Dependence of nF on the incidence angle was only observed in winter. 4) Forest omega(F) is independent of polarization, incidence angle, woody volume and forest type, but the omega(F) value derived in this study is significantly higher than the default values of the SMOS and SMAP algorithms.

关键词： Boreal Boreal forests albedo L-band network file system Forest Case studies angle of incidence Taiga Polarization Northeast brightness temperature

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：