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1

In search of an API for scalable file systems: Under the table or above it?  

E-print Network

file systems, GoogleFS [12] and Hadoop distributed FS [15], that are designed "from scratch" to deliverIn search of an API for scalable file systems: Under the table or above it? Swapnil Patil, Garth A high performance primarily for their anticipated DISC workloads. However, cluster file systems have

2

On Benchmarking Popular File Systems  

Microsoft Academic Search

In recent years, Windows, Linux and BSD have become dominant operating systems in personal computers (1). An essential component of the operating system is its file system. Although there are reports (2, 3) on evaluation of file systems under the same operating system, it is necessary to assess the performance of different file systems under their associated operating systems to

Matti Vanninen; James Z. Wang

3

Semantic file systems  

Microsoft Academic Search

A semantic file system is an information storage system that provides flexible associative access to the system's contents by automatically extracting attributes from files with file type specific transducers. Associative access is provided by a conservative extension to existing tree-structured file system protocols, and by protocols that are designed specifically for content based access. Compatiblity with existing file system protocols

David K. Gifford; Pierre Jouvelot; Mark A. Sheldon; James W. O'Toole Jr.

1991-01-01

4

File Layout and File System Performance  

Microsoft Academic Search

TR-35-94 Abstract Most contemporary implementations of the Berkeley Fast File System optimize file system throughput by allocating logically sequential data to physically contiguous disk blocks. This clustering is ef fective when there are many contiguous free blocks on the file system. But the repeated creation and deletion of files of varying sizes that occurs over time on active file systems

Keith Smith; Margo Seltzer

1994-01-01

5

Serverless Network File Systems  

Microsoft Academic Search

In this paper, we propose a new paradigm for network file system design, serverless network file systems. While traditional network file systems rely on a central server machine, a serverless system utilizes workstations cooperating as peers to provide all file system services. Any machine in the system can store, cache, or control any block of data. Our approach uses this

Thomas E. Anderson; Michael Dahlin; Jeanna M. Neefe; David A. Patterson; Drew S. Roselli; Randolph Y. Wang

1995-01-01

6

Serverless network file systems  

Microsoft Academic Search

We propose a new paradigm for network file system design: serverless network file systems. While traditional network file systems rely on a central server machine, a serverless system utilizes workstations cooperating as peers to provide all file system services. Any machine in the system can store, cache, or control any block of data. Our approach uses this location independence, in

Thomas E. Anderson; Michael D. Dahlin; Jeanna M. Neefe; David A. Patterson; Drew S. Roselli; Randolph Y. Wang

1996-01-01

7

Extensible file systems in spring  

Microsoft Academic Search

In this paper we describe an architecture for extensible file systems. The architecture enables the extension of file system functionality by composing (or stacking) new file systems on top of existing file systems. A file system that is stacked on top of an existing file system can access the existing file system's files via a well-defined naming interface and can

Yousef A. Khalidi; Michael N. Nelson

1993-01-01

8

Extensible file systems in spring  

Microsoft Academic Search

In this paper we describe an architecture for extensible file systems. The architecture enables the extension of file system functionality by composing (or stacking) new file systems on top of existing file systems. A file system that is stacked on top of an existing file system can access the existing file system's files via a well-defined naming interface and can

Yousef A. Khalidi; Michael N. Nelson

1994-01-01

9

Enhancing file data security in linux operating system by integrating secure file system  

Microsoft Academic Search

In today's world securing file data is very important. The proposed Secure File System (SFS), we have designed, provides file data security using cryptographic techniques in a transparent and convenient way. The proposed SFS pushes encryption services into the Linux kernel space, mounting it between the virtual file system layer and underlying file system. After SFS is integrated with the

Rajesh Kumar Pal; Indranil Sengupta

2009-01-01

10

Accessing files in an Internet: The Jade file system  

NASA Technical Reports Server (NTRS)

Jade is a new distribution file system that provides a uniform way to name and access files in an internet environment. It makes two important contributions. First, Jade is a logical system that integrates a heterogeneous collection of existing file systems, where heterogeneous means that the underlying file systems support different file access protocols. Jade is designed under the restriction that the underlying file system may not be modified. Second, rather than providing a global name space, Jade permits each user to define a private name space. These private name spaces support two novel features: they allow multiple file systems to be mounted under one directory, and they allow one logical name space to mount other logical name spaces. A prototype of the Jade File System was implemented on Sun Workstations running Unix. It consists of interfaces to the Unix file system, the Sun Network File System, the Andrew File System, and FTP. This paper motivates Jade's design, highlights several aspects of its implementation, and illustrates applications that can take advantage of its features.

Peterson, Larry L.; Rao, Herman C.

1991-01-01

11

The Google file system  

Microsoft Academic Search

We have designed and implemented the Google File Sys- tem, a scalable distributed file system for large distributed data-intensive applications. It provides fault tolerance while running on inexpensive commodity hardware, and it delivers high aggregate performance to a large number of clients. While sharing many of the same goals as previous dis- tributed file systems, our design has been driven

Sanjay Ghemawat; Howard Gobioff; Shun-Tak Leung

2003-01-01

12

Network file-storage system  

SciTech Connect

The Central File System (CFS) is a file management and file storage system for the Los Alamos National Laboratory's computer network. The CFS is organized as a hierarchical storage system: active files are stored on fast-access storage devices; larger, less active files are stored on slower, less expensive devices; and archival files are stored offline. Files are automatically moved between the various classes of storage by a file migration program that analyzes file activity, file size and storage device capabilties. This has resulted in a cost-effective system that provides both fast access and large data storage capability.

Collins, M.W.; Devaney, M.J.; Willbanks, E.W.

1983-01-01

13

The Episode File System  

Microsoft Academic Search

We describe the design of Episode?, a highly portable POSIX-compliant file system. Episode is designed to utilize the disk bandwidth efficiently, and to scale well with improvements in disk capacity and speed. It utilizes logging of meta-data to obtain good performance, and to restart quickly after a crash. Episode uses a layered architecture and a generalization of files called containers

Sailesh Chutani; Owen T. Anderson; Michael L. Kazar; Bruce W. Leverett; W. Anthony Mason; Robert N. Sidebotham

1992-01-01

14

----Google File System Windows IT  

E-print Network

Essential ---- Google File System web Windows IT Google IT Google Google File System Google File System Datebase Google Google " " Goolge Goolge Google Google Goolge Google ()(,) Google ...... Google IT Google Google Google Google Google "Google " Google 10

15

The Global File System  

NASA Technical Reports Server (NTRS)

The global file system (GFS) is a prototype design for a distributed file system in which cluster nodes physically share storage devices connected via a network-like fiber channel. Networks and network-attached storage devices have advanced to a level of performance and extensibility so that the previous disadvantages of shared disk architectures are no longer valid. This shared storage architecture attempts to exploit the sophistication of storage device technologies whereas a server architecture diminishes a device's role to that of a simple component. GFS distributes the file system responsibilities across processing nodes, storage across the devices, and file system resources across the entire storage pool. GFS caches data on the storage devices instead of the main memories of the machines. Consistency is established by using a locking mechanism maintained by the storage devices to facilitate atomic read-modify-write operations. The locking mechanism is being prototyped in the Silicon Graphics IRIX operating system and is accessed using standard Unix commands and modules.

Soltis, Steven R.; Ruwart, Thomas M.; OKeefe, Matthew T.

1996-01-01

16

Stupid File Systems Are Better  

Microsoft Academic Search

File systems were originally designed for hosts with only one disk. Over the past 20 years, a number of in- creasingly complicated changes have optimized the per- formance of file systems on a single disk. Over the same time, storage systems have advanced on their own, separated from file systems by the narrow block inter- face. Storage systems have increasingly

Lex Stein

2005-01-01

17

IRON FILE SYSTEMS Vijayan Prabhakaran  

E-print Network

IRON FILE SYSTEMS by Vijayan Prabhakaran B.E. Computer Sciences (Regional Engineering College;v Abstract IRON FILE SYSTEMS Vijayan Prabhakaran Disk drives are widely used as a primary medium for storing information. While commodity file systems trust disks to either work or fail completely, modern

Liblit, Ben

18

IRON FILE SYSTEMS Vijayan Prabhakaran  

E-print Network

IRON FILE SYSTEMS by Vijayan Prabhakaran B.E. Computer Sciences (Regional Engineering College #12; v Abstract IRON FILE SYSTEMS Vijayan Prabhakaran Disk drives are widely used as a primary medium for storing information. While commodity file systems trust disks to either work or fail completely, modern

Arpaci-Dusseau, Andrea

19

The Tiger Shark File System  

E-print Network

Tiger Shark is a parallel file system for IBM's AIX operating system. It is designed to support interactive multimedia, particularly large-scale systems such as interactive television (ITV). Tiger Shark scales across the entire RS/ 6000 product line, from small desktop machines to the SP2 parallel supercomputer. Tiger Shark's primary features are support for continuoustime data, scalability, high availability, and manageability, all of which are crucial in its role in large-scale video servers. Interestingly, most of the features that make Tiger Shark a good video server are important for other largescale applications such as technical computing, data mining, digital library, and scalable network file servers. This paper briefly describes Tiger Shark: the environment that makes it important, the key technology it embodies, and the efforts to build products based on it. Introduction Over the past several years, radical changes have occurred in the underlying technology of computing and...

Roger L. Haskin; Frank B. Schmuck

1996-01-01

20

Large File System Backup: NERSC Global File System Experience  

SciTech Connect

NERSC's Global File system (NGF), accessible from all compute systems at NERSC, holds files and data from many scientific projects. A full backup of this file system to our High Performance Storage System (HPSS) is performed periodically. Disk storage usage by projects at NERSC has grown seven fold over a two year period, from ~;;20TB in June 2006 to ~;;140 TB in June 2008. The latest full backup took about 13 days and more than 200 T10k tape cartridges (.5 TB capacity). Petabyte file systems are becoming a reality in the next few years and the existing utilities are already strained in handling backup tasks.

Mokhtarani, Akbar; Andrews, Matthew; Hick, Jason; Kramer, William

2008-10-23

21

The Galley Parallel File System  

NASA Technical Reports Server (NTRS)

As the I/O needs of parallel scientific applications increase, file systems for multiprocessors are being designed to provide applications with parallel access to multiple disks. Many parallel file systems present applications with a conventional Unix-like interface that allows the application to access multiple disks transparently. The interface conceals the parallelism within the file system, which increases the ease of programmability, but makes it difficult or impossible for sophisticated programmers and libraries to use knowledge about their I/O needs to exploit that parallelism. Furthermore, most current parallel file systems are optimized for a different workload than they are being asked to support. We introduce Galley, a new parallel file system that is intended to efficiently support realistic parallel workloads. We discuss Galley's file structure and application interface, as well as an application that has been implemented using that interface.

Nieuwejaar, Nils; Kotz, David

1996-01-01

22

The Galley Parallel File System  

NASA Technical Reports Server (NTRS)

Most current multiprocessor file systems are designed to use multiple disks in parallel, using the high aggregate bandwidth to meet the growing I/0 requirements of parallel scientific applications. Many multiprocessor file systems provide applications with a conventional Unix-like interface, allowing the application to access multiple disks transparently. This interface conceals the parallelism within the file system, increasing the ease of programmability, but making it difficult or impossible for sophisticated programmers and libraries to use knowledge about their I/O needs to exploit that parallelism. In addition to providing an insufficient interface, most current multiprocessor file systems are optimized for a different workload than they are being asked to support. We introduce Galley, a new parallel file system that is intended to efficiently support realistic scientific multiprocessor workloads. We discuss Galley's file structure and application interface, as well as the performance advantages offered by that interface.

Nieuwejaar, Nils; Kotz, David

1996-01-01

23

Fast Consistency Checking for the Solaris File System  

Microsoft Academic Search

Our Netra NFS group at Sun set out to solve the challenging problem of providing remote Network File System (NFS) service with high performance and availability. An NFS server must guarantee the permanence of changes to the file system before acknowledging an NFS request. Thus, the server's underlying local file system must perform update operations synchronously to stable storage with

J. Kent Peacock; Ashvin Kamaraju; Sanjay Agrawal

24

File system unification using LatticeFS  

E-print Network

LatticeFS is a namespace unification system designed to merge multiple source file systems into a single working file system. atticeFS can be used to merge multiple software package directories, work with multiple file ...

Su, Yang, M. Eng. Massachusetts Institute of Technology

2009-01-01

25

A Cached WORM File System  

Microsoft Academic Search

SUMMARY This paper describes a general-purpos e file system that uses a write-once-rea d-many (WORM) optical disk accessed via a magnetic disk cache. The cache enables blocks to be modified a number of times before they are written to the WORM and increases performance. Snapshots of the file system can be made at any time without limiting the users' access

Sean Quinlan

1991-01-01

26

Scalability in the XFS File System  

Microsoft Academic Search

Abstract Inthis paper we describe ,the architecture and design of a new file system, XFS, for Silicon Graphics’ IRIX operating system. It is a general ,purpose file system for use on both workstations and servers. The focus of the paper is on the mechanisms,used by XFS to scale capacity and performance,in supporting very large file systems. The large file system

Adam Sweeney; Wei Hu; Curtis Anderson; Mike Nishimoto; Geoff Peck

1996-01-01

27

File System Overview In this note, we introduce a simple file system implementation,  

E-print Network

30 File System Overview In this note, we introduce a simple file system implementation, known as vsfs (the Very Simple File System). This file system is a simplified version of a typical UNIX file system and thus serves to introduce some of the basic on-disk structures, access methods, and policies

Sheridan, Jennifer

28

tmpfs: A Virtual Memory File System  

Microsoft Academic Search

This paper describes tmpfs, a memory-based file system that uses resources and structures of the SunOS virtual memory subsystem. Rather than using dedicated physical memory such as a ''RAM disk'', tmpfs uses the operating system page cache for file data. It provides increased performance for file reads and writes, allows dynamic sizing of the file system while requiring no disk

Peter Snyder

1990-01-01

29

Tuning HDF5 for Lustre File Systems  

SciTech Connect

HDF5 is a cross-platform parallel I/O library that is used by a wide variety of HPC applications for the flexibility of its hierarchical object-database representation of scientific data. We describe our recent work to optimize the performance of the HDF5 and MPI-IO libraries for the Lustre parallel file system. We selected three different HPC applications to represent the diverse range of I/O requirements, and measured their performance on three different systems to demonstrate the robustness of our optimizations across different file system configurations and to validate our optimization strategy. We demonstrate that the combined optimizations improve HDF5 parallel I/O performance by up to 33 times in some cases running close to the achievable peak performance of the underlying file system and demonstrate scalable performance up to 40,960-way concurrency.

Howison, Mark; Koziol, Quincey; Knaak, David; Mainzer, John; Shalf, John

2010-09-24

30

The Jade File System. Ph.D. Thesis  

NASA Technical Reports Server (NTRS)

File systems have long been the most important and most widely used form of shared permanent storage. File systems in traditional time-sharing systems, such as Unix, support a coherent sharing model for multiple users. Distributed file systems implement this sharing model in local area networks. However, most distributed file systems fail to scale from local area networks to an internet. Four characteristics of scalability were recognized: size, wide area, autonomy, and heterogeneity. Owing to size and wide area, techniques such as broadcasting, central control, and central resources, which are widely adopted by local area network file systems, are not adequate for an internet file system. An internet file system must also support the notion of autonomy because an internet is made up by a collection of independent organizations. Finally, heterogeneity is the nature of an internet file system, not only because of its size, but also because of the autonomy of the organizations in an internet. The Jade File System, which provides a uniform way to name and access files in the internet environment, is presented. Jade is a logical system that integrates a heterogeneous collection of existing file systems, where heterogeneous means that the underlying file systems support different file access protocols. Because of autonomy, Jade is designed under the restriction that the underlying file systems may not be modified. In order to avoid the complexity of maintaining an internet-wide, global name space, Jade permits each user to define a private name space. In Jade's design, we pay careful attention to avoiding unnecessary network messages between clients and file servers in order to achieve acceptable performance. Jade's name space supports two novel features: (1) it allows multiple file systems to be mounted under one direction; and (2) it permits one logical name space to mount other logical name spaces. A prototype of Jade was implemented to examine and validate its design. The prototype consists of interfaces to the Unix File System, the Sun Network File System, and the File Transfer Protocol.

Rao, Herman Chung-Hwa

1991-01-01

31

The Future of the Andrew File System  

ScienceCinema

The talk will discuss the ten operational capabilities that have made AFS unique in the distributed file system space and how these capabilities are being expanded upon to meet the needs of the 21st century. Derrick Brashear and Jeffrey Altman will present a technical road map of new features and technical innovations that are under development by the OpenAFS community and Your File System, Inc. funded by a U.S. Department of Energy Small Business Innovative Research grant. The talk will end with a comparison of AFS to its modern days competitors.

None

2011-04-25

32

Replication in the Harp File System  

Microsoft Academic Search

This paper describes the design and implementation of the Harp file system. Harp is a replicated Unix file system accessible via the VFS interface. It provides highly available and reliable storage for files and guarantees that file operations are executed atomically in spite of concurrency and failures. It uses a novel variation of the primary copy replication technique that provides

Barbara Liskov; Sanjay Ghemawat; Robert Gruber; Paul Johnson; Liuba Shrira; Michael Williams

1991-01-01

33

The Hadoop Distributed File System  

Microsoft Academic Search

The Hadoop Distributed File System (HDFS) is designed to store very large data sets reliably, and to stream those data sets at high bandwidth to user applications. In a large cluster, thousands of servers both host directly attached storage and execute user application tasks. By distributing storage and computation across many servers, the resource can grow with demand while remaining

Konstantin Shvachko; Hairong Kuang; Sanjay Radia; Robert Chansler

2010-01-01

34

On the Duality of Data-intensive File System Design: Reconciling HDFS and PVFS  

E-print Network

Systems Managment-- Distributed file systems Keywords Hadoop, HDFS, PVFS, cloud computing, file systems 1On the Duality of Data-intensive File System Design: Reconciling HDFS and PVFS Wittawat, the underlying file system is a key component for scalable application performance. In this paper, we explore

35

Porting the SGI XFS File System to Linux  

Microsoft Academic Search

In late 1994, SGI released an advanced, journaled file sys- tem called XFS on IRIX, their System-V-derived version of UNIX. Since that time, XFS has proven itself in pro- duction as a fast, highly scalable file system suitable for computer systems ranging from the desktop to supercom- puters. In early 1999, SGI announced that XFS would be released under an

Jim Mostek; Bill Earl; Steven Levine; Steve Lord; Russell Cattelan; Ken Mcdonell; Ted Kline; Brian Gaffey; Rajagopal Ananthanarayanan

2000-01-01

36

The File Manager System  

PubMed Central

A database system written in Standard MUMPS has been implemented at a dozen Veterans Administration sites. While originally designed as a tool for programmers, the package can also be run as a standalone “programmerless” system. Through terminal dialogues, non-technical users can create, edit and store database schemas, and input and output “programs”.

Timson, George

1980-01-01

37

Separating key management from file system security  

Microsoft Academic Search

No secure network file system has ever grown to span the Internet. Existing systems all lack adequate key management for security at a global scale. Given the diversity of the Internet, any particular mechanism a file system employs to manage keys will fail to support many types of use.We propose separating key management from file system security, letting the world

David Mazières; Michael Kaminsky; M. Frans Kaashoek; Emmett Witchel

1999-01-01

38

Stackable File Systems as a Security Tool  

Microsoft Academic Search

Programmers often prefer to use existing system security services, such as file system security, rather than im- plement their own in an application. Traditional Unix security is generally considered inadequate and few operating systems offer enhanced security features such as ACLs(24) or immutable files(12). Additional file system security features are always sought, but implementing them is a difficult task because

Erez Zadok

1999-01-01

39

Separating key management from file system security  

Microsoft Academic Search

Abstract No secure network file system has ever grown to span the Internet. Existing systems all lack adequate key management for security at a global scale. Given the diversity of the Internet, any particular mechanism a file system employs to manage,keys will fail to support many types of use. We propose separating key management,from file system security, letting the world

David Mazières; Michael Kaminsky; M. Frans Kaashoek; Emmett Witchel

2000-01-01

40

Rapid file system development using ptrace  

Microsoft Academic Search

Developing kernel-level file systems is a difficult task that requires a significant time investment. For experimental file systems , it is desirable to develop a prototype before investing the time r equired to develop a kernel-level file system. We have built a ptrace moni- toring infrastructure for file system development. Because our sys- tem runs entirely in user-space, debugging is

Richard P. Spillane; Charles P. Wright; Gopalan Sivathanu; Erez Zadok

2007-01-01

41

USP: A Lightweight File System Management Framework  

Microsoft Academic Search

With data amount growing at an ever increasing rate, file system, as the basis of data management, its functionality and content are becoming more and more complex. Thus the file system is forced to be upgraded constantly, in order to satisfy the growing demands. However, the reinvention of new file systems is always a high-cost task. Although there are frameworks

Zhan Shi; Dan Feng; Heng Zhao; Lingfang Zeng

2010-01-01

42

Design And Implementation Of An Island-Based File System  

Microsoft Academic Search

Reliability, availability and scalability are major concerns in the design of distributed file systems. We have built an island-based file system (IFS) called Archipelago to solve these problems by failure isolation and low-cost consistency maintenance. The building blocks of IFS are smaller self-contained file servers called islands. The main idea underlying island-based design is the one-island principle: as many operations

Minwen Ji; Edward W. Felten

1999-01-01

43

Texas Natural Resources Information System. File Description Report.  

ERIC Educational Resources Information Center

Descriptions are given for the 164 computerized files that comprise the Texas Natural Resources Information System (TNRIS). The system provides natural resources information to federal, state, regional, and local and private entities. File descriptions are organized under the following data and information content areas: (1) base data, (2)…

Interagency Council on Natural Resources and the Environment, Austin, TX. Texas Natural Resources Information System.

44

OPERATING SYSTEM SUPPORT FOR EASY DEVELOPMENT OF DISTRIBUTED FILE SYSTEMS  

Microsoft Academic Search

A number of new distributed file systems have been de- veloped, but the development of such file systems is not a simple task because it requires the operating system kernel to be modified. We have therefore developed the CAPELA operating system, which makes distributed file systems easy to develop. CAPELA allows the users to develop a file system as an

KENICHI KOURAI; SHIGERU CHIBA; TAKASHI MASUDA

1998-01-01

45

Rump File Systems: Kernel Code Reborn  

Microsoft Academic Search

When kernel functionality is desired in userspace, the common approach is to reimplement it for userspace in- terfaces. We show that use of existing kernel file sys- tems in userspace programs is possible without modify- ing the kernel file system code base. Two different op- erating modes are explored: 1) a transparent mode, in which the file system is mounted

Antti Kantee

46

Self-Similarity in File Systems  

Microsoft Academic Search

We demonstrate that high-level file system events exhibit self-similar behaviour, but only for short-term time scales of approximately under a day. We do so through the analysis of four sets of traces that span time scales of milliseconds through months, and that differ in the trace collection method, the filesystems being traced, and the chronological times of the tracing. Two

Steven D. Gribble; Gurmeet Singh Manku; Drew S. Roselli; Eric A. Brewer; Timothy J. Gibson; Ethan L. Miller

1998-01-01

47

VFS Interceptor: Dynamically Tracing File System Operations in real environments  

Microsoft Academic Search

File system traces have been used for file system evaluation, user behavior analysis, file system debugging and intrusion detection. Current file system tracing tools are hardly applicable in real environments, because they require restarting the applications or are designed for specific kinds of file systems. We developed VFS Interceptor, a low-overhead tool for capturing file system traces dynamically. First, it

Yang Wang; Jiwu Shu; Wei Xue; Mao Xue

48

A Metadata-Rich File System  

SciTech Connect

Despite continual improvements in the performance and reliability of large scale file systems, the management of file system metadata has changed little in the past decade. The mismatch between the size and complexity of large scale data stores and their ability to organize and query their metadata has led to a de facto standard in which raw data is stored in traditional file systems, while related, application-specific metadata is stored in relational databases. This separation of data and metadata requires considerable effort to maintain consistency and can result in complex, slow, and inflexible system operation. To address these problems, we have developed the Quasar File System (QFS), a metadata-rich file system in which files, metadata, and file relationships are all first class objects. In contrast to hierarchical file systems and relational databases, QFS defines a graph data model composed of files and their relationships. QFS includes Quasar, an XPATH-extended query language for searching the file system. Results from our QFS prototype show the effectiveness of this approach. Compared to the defacto standard, the QFS prototype shows superior ingest performance and comparable query performance on user metadata-intensive operations and superior performance on normal file metadata operations.

Ames, S; Gokhale, M B; Maltzahn, C

2009-01-07

49

TABLEFS: Enhancing Metadata Efficiency in the Local File System  

E-print Network

TABLEFS: Enhancing Metadata Efficiency in the Local File System Kai Ren, Garth Gibson CMU-PDL-12-3890 Acknowledgements: This research is supported in part by The Gordon and Betty Moore Foundation, NSF under award, SCI

50

Extending File Systems Using Stackable Templates  

Microsoft Academic Search

Extending file system functionality is not a new idea, but a desirable one nonetheless(6, 14, 18). In the several years since stackable file systems were first proposed, only a handful are in use(12, 19). Impediments to writing new file systems include the complexity of operating systems, the difficulty of writing kernel-based code, the lack of a true stackable vnode interface(14),

Erez Zadok; Ion Badulescu; Alex Shender

1999-01-01

51

Secure resilient high performance file system for distributed systems  

Microsoft Academic Search

While client server distributed file systems, such as NFS (Network File System) or Sprite, do not scale with respect to the number of clients and exhibit a single point of failure, our work in this paper has the potential to cope with an increasing number of participants. Although most of the current distributed file systems ensure authentication and file access

Sunil Chakravarthy; Chittaranjan Hota

2010-01-01

52

A Comparison of File System Workloads  

Microsoft Academic Search

In this paper, we describe the collection and analysis of file system traces from a variety of different environ- ments, including both UNIX and NT systems, clients and servers, and instructional and production systems. Our goal is to understand how modern workloads affect the ability of file systems to provide high performance to users. Because of the increasing gap between

Drew S. Roselli; Jacob R. Lorch; Thomas E. Anderson

2000-01-01

53

Fsck - The UNIX† File System Check Program  

Microsoft Academic Search

This document reflects the use of fsck with the 4.2BSD and 4.3BSD file system organization. This is a revision of the original paper written by T. J. Kowalski. File System Check Program (fsck) is an interactive file system check and repair program. Fsck uses the redundant structural information in the UNIX filesystem to per- form several consistency checks. If an

Marshall Kirk McKusick; T. J. Kowalski

54

A High Performance Cluster File System with Standard Network File System Interface  

Microsoft Academic Search

The cluster technology can organize many cheap servers to cluster, and obtain the high performance. The traditional cluster file systems although can achieve high performance, but these systems all require to modify the software on client. This requirement make these systems can not be widely applied. This paper provides a novel high performance cluster file system with standard network file

Jun Lu; Bin Du; Yi Zhu; Ly Ren; Daiw Li

2009-01-01

55

A file system for accessing MySQL tables as CSV files  

E-print Network

In this thesis, we describe the design and implementation of a userspace file system that represents MySQL tables as comma-separated values (CSV) files. The users can access and modify the data through both the file system ...

Ordulu, Nizameddin (Nizameddin H.)

2010-01-01

56

Operating System Support for Extensible Secure File Systems  

Microsoft Academic Search

Abstract of the RPE Operating System Support for Extensible Secure File Systems by Charles P. Wright Stony Brook University 2004 Securing data is more important than ever, yet secure file systems still have not received wide use.

CHARLES P. WRIGHT

2004-01-01

57

A Large-Scale Study of File-System Contents  

Microsoft Academic Search

We collect and analyze a snapshot of data from 10,568 file systems of 4801 Windows personal computers in a commercial environment. The file systems contain 140 million files totaling 10.5 TB of data. We develop analytical approximations for distributions of file size, file age, file functional lifetime, directory size, and directory depth, and we compare them to previously derived distributions.

John R. Douceur; William J. Bolosky

1999-01-01

58

Membrane: Operating System Support for Restartable File Systems  

Microsoft Academic Search

We introduce Membrane, a set of changes to the oper- ating system to support restartable file systems. Mem- brane allows an operating system to tolerate a broad class of file system failures and does so while remain- ing transparent to running applications; upon failure, the file system restarts, its state is restored, and pending ap- plication requests are serviced as

Swaminathan Sundararaman; Sriram Subramanian; Abhishek Rajimwale; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau; Michael M. Swift

2010-01-01

59

Speculative Execution in a Distributed File System  

E-print Network

System to provide the consistency of single-copy file semantics and the safety of synchronous I/O, yet still outperform current distributed file systems with weaker consistency and safety. Categories' address: Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI

Chen, Peter M.

60

Hadoop distributed file system for the Grid  

Microsoft Academic Search

Data distribution, storage and access are essential to CPU-intensive and data-intensive high performance Grid computing. A newly emerged file system, Hadoop distributed file system (HDFS), is deployed and tested within the Open Science Grid (OSG) middleware stack. Efforts have been taken to integrate HDFS with other Grid tools to build a complete service framework for the Storage Element (SE). Scalability

G. Attebury; A. Baranovski; K. Bloom; B. Bockelman; D. Kcira; J. Letts; T. Levshina; C. Lundestedt; T. Martin; W. Maier; Haifeng Pi; A. Rana; I. Sfiligoi; A. Sim; M. Thomas; F. Wuerthwein

2009-01-01

61

A Metadata-Rich File System  

Microsoft Academic Search

Despite continual improvements in the performance and reliability of large scale file systems, the management of file system metadata has changed little in the past decade. The mismatch between the size and complexity of large scale data stores and their ability to organize and query their metadata has led to a de facto standard in which raw data is stored

Sasha Ames; Maya B. Gokhale; Carlos Maltzahn

2009-01-01

62

On the Duality of Data-intensive File System Design  

E-print Network

parallel file system for Hadoop workloads? · PVFS: parallel file system · HDFS: file system designed application Hadoop framework File system API HDFS client library HDFS servers PVFS shim layer (via JNI) UnmodiOn the Duality of Data- intensive File System Design: Reconciling HDFS and PVFS Wittawat

63

Zettabyte File System Autopsy: Digital Crime Scene Investigation for Zettabyte File System  

Microsoft Academic Search

Files stored on a computer are managed by the file system of the operating system. When a computer is used to store illegal data such as child pornography, it is important that the ex- istence of the illegal data can be proven even after the data is deleted. In this study, a new functionality is added to the Zettabyte File

Andrew Li

64

Security Policy Enforcement at the File System Level in the Windows NT Operating System Family  

Microsoft Academic Search

This paper describes the implementation of an enforce- ment module for file system security implemented as part of a security architecture for distributed systems which en- forces a centrally administered security policy under the Windows NT operating system platform. The mechanism provides mandatory access control, encryption, and audit- ing on an individual file basis across distributed systems while being fully

Stephen D. Wolthusen

2001-01-01

65

A high performance and low cost distributed file system  

Microsoft Academic Search

Recently, the concept of distributed file system has been widely used in many Internet applications. A distributed file system integrates many file servers on the network and becomes an efficiency file system with large storage space. Users can access their files anytime and anywhere. However, the cost for building and maintaining these storage systems is high for many small enterprises

Tzong-Jye Liu; Chun-Yan Chung; Chia-Lin Lee

2011-01-01

66

Deciding when to forget in the Elephant file system  

Microsoft Academic Search

Modern file systems associate the deletion of a file with the immediate release of storage, and file writes with the irrevocable change of file contents. We argue that this behavior is a relic of the past, when disk storage was a scarce resource. Today, large cheap disks make it possible for the file system to protect valuable data from accidental

Douglas S. Santry; Michael J. Feeley; Norman C. Hutchinson; Alistair C. Veitch; Ross W. Carton; Jacob Ofir

1999-01-01

67

Why panic()?: improving reliability with restartable file systems  

Microsoft Academic Search

The file system is one of the most critical components of the operating system. Almost all applications running in the operating system require file systems to be available for their proper operation. Though file-system availability is critical in many cases, very little work has been done on tolerating file system crashes. In this paper, we propose Membrane, a set of

Swaminathan Sundararaman; Sriram Subramanian; Abhishek Rajimwale; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau; Michael M. Swift

2010-01-01

68

Why panic()? Improving Reliability with Restartable File Systems  

Microsoft Academic Search

The file system is one of the most critical components of the operating system. Almost all applications running in the op - erating system require file systems to be available for their proper operation. Though file-system availability is critical in many cases, very little work has been done on tolerating file system crashes. In this paper, we propose Membrane, a

Swaminathan Sundararaman; Sriram Subramanian; Abhishek Rajimwale; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau; Michael M. Swift

69

Crossing the Chasm: Sneaking a parallel file system  

E-print Network

Crossing the Chasm: Sneaking a parallel file system into Hadoop Wittawat Tantisiriroj Swapnil Patil a parallel file system for Internet service applications? · Hadoop, an Internet service software stack · HDFS, an Internet service file system for Hadoop · PVFS, a parallel file system Wittawat Tantisiriroj © November 08

70

Snapshots in Hadoop Distributed File System Sameer Agarwal  

E-print Network

Snapshots in Hadoop Distributed File System Sameer Agarwal UC Berkeley Dhruba Borthakur Facebook. #12;Figure 1: HDFS Files 2 Background: HDFS Design Similarly to Google File System [6], Hadoop of any file system, as snapshots enable system adminis- trators to perform data backup and recovery

California at Irvine, University of

71

On the Duality of Data-intensive File System Design  

E-print Network

framework and runs cloud workload (Hadoop) · PVFS: parallel file system · HDFS: file system designed for Hadoop · Tells a story of making a parallel file system work well in a cloud workload #12;Wittawat © November 11!http://www.pdl.cmu.edu/ 6 Hadoop application Hadoop framework File system API (Java) HDFS

72

A file system for continuous media  

Microsoft Academic Search

The Continuous Media File System, CMFS, supports real-time storage and retrieval of continuous media data (digital audio and video) on disk. CMFS clients read or write files in “sessions,” each with a guaranteed minimum data rate. Multiple sessions, perhaps with different rates, and non-real-time access can proceed concurrently. CMFS addresses several interrelated design issues; real-time semantics fo sessions, disk layout,

David P. Anderson; Yoshitomo Osawa; Ramesh Govindan

1992-01-01

73

28 CFR 58.7 - Procedures for Completing Uniform Forms of Trustee Final Reports in Cases Filed Under Chapters 7...  

Code of Federal Regulations, 2013 CFR

...Receipts and disbursements of the estate; (5) Expenses of administration, including for...under section 707(b), actual costs of administering cases under chapter...Management/Electronic Case Filing System (CM/ECF) as a “smart...

2013-07-01

74

28 CFR 58.7 - Procedures for Completing Uniform Forms of Trustee Final Reports in Cases Filed Under Chapters 7...  

Code of Federal Regulations, 2010 CFR

...Receipts and disbursements of the estate; (5) Expenses of administration, including for...under section 707(b), actual costs of administering cases under chapter...Management/Electronic Case Filing System (CM/ECF) as a “smart...

2010-07-01

75

28 CFR 58.7 - Procedures for Completing Uniform Forms of Trustee Final Reports in Cases Filed Under Chapters 7...  

Code of Federal Regulations, 2011 CFR

...Receipts and disbursements of the estate; (5) Expenses of administration, including for...under section 707(b), actual costs of administering cases under chapter...Management/Electronic Case Filing System (CM/ECF) as a “smart...

2011-07-01

76

28 CFR 58.7 - Procedures for Completing Uniform Forms of Trustee Final Reports in Cases Filed Under Chapters 7...  

Code of Federal Regulations, 2012 CFR

...Receipts and disbursements of the estate; (5) Expenses of administration, including for...under section 707(b), actual costs of administering cases under chapter...Management/Electronic Case Filing System (CM/ECF) as a “smart...

2012-07-01

77

Performance of the Galley Parallel File System  

NASA Technical Reports Server (NTRS)

As the input/output (I/O) needs of parallel scientific applications increase, file systems for multiprocessors are being designed to provide applications with parallel access to multiple disks. Many parallel file systems present applications with a conventional Unix-like interface that allows the application to access multiple disks transparently. This interface conceals the parallism within the file system, which increases the ease of programmability, but makes it difficult or impossible for sophisticated programmers and libraries to use knowledge about their I/O needs to exploit that parallelism. Furthermore, most current parallel file systems are optimized for a different workload than they are being asked to support. We introduce Galley, a new parallel file system that is intended to efficiently support realistic parallel workloads. Initial experiments, reported in this paper, indicate that Galley is capable of providing high-performance 1/O to applications the applications that rely on them. In Section 3 we describe that access data in patterns that have been observed to be common.

Nieuwejaar, Nils; Kotz, David

1996-01-01

78

INFIRS, Inverted File Information Retrieval System.  

ERIC Educational Resources Information Center

The Inverted File Information Retrieval System (INFIRS), is a document search system which offers a comprehensive range of search facilities. It has been developed at the United Kingdom Chemical Information Service (UKCIS) as a general purpose retrieval tool, suitable for handling a wide variety of data-bases (both free-text and controlled…

McCracken, I. C.; And Others

79

Selfcertifying File System David Mazi`eres  

E-print Network

No secure network file system has ever grown to span the Internet. Existing systems all lack adequate key management for security at a global scale. Given the diversity of the Internet, any particular mechanism the kind of grungy, low­level hacking few students can expect from professors, and for generally being

Gummadi, Ramakrishna

80

A Caching File System For a Programmer's Workstation  

Microsoft Academic Search

This paper describes a file system for a programmer's workstation that has access both to a local disk and to remote file servers. The file system is designed to help programmers manage their local naming environments and share consistent versions of collections of software. It names multiple versions of local and remote files in a hier- archy. Local names can

Michael D. Schroeder; David K. Gifford; Roger M. Needham

1985-01-01

81

Computer Forensics Research and Implementation Based on NTFS File System  

Microsoft Academic Search

Based on NTFS file system, this paper proposed an algorithm of reconstructing directory tree above deleted files. Further more, by analyzing the internal structure of the NTFS file system in detailed, the storage principle of Data Runs in attribute 80 of MFT is clarified. Author analyzed some exceptions occurred during deleting files and compared the self-researched data recovery software named

Liu Naiqi; Wang Zhongshan; Hao Yujie; QinKe

2008-01-01

82

Distributed Directory Service in the Farsite File System  

Microsoft Academic Search

We present the design, implementation, and evaluation of a fully distributed directory service for Farsite, a logically centralized file system that is physically implemented on a loosely coupled network of desktop computers. Prior to this work, the Farsite system included distributed mechanisms for file content but centralized mechanisms for file metadata. Our distributed directory service introduces tree-structured file identifiers that

John R. Douceur; Jon Howell

2006-01-01

83

THE EDGE NODE FILE SYSTEM: A DISTRIBUTED FILE SYSTEM FOR HIGH PERFORMANCE COMPUTING  

Microsoft Academic Search

The concept of using Internet edge nodes for High Performance Computing (HPC) applications has gained ac- ceptance in recent times. Many of these HPC applications also have large I\\/O requirements. Consequently, an edge node file system that efficiently manages the large number of files involved can assist in improving application performance significantly. In this paper, we discuss the design of

KOVENDHAN PONNAVAIKKOAND

84

Tiger Shark - A scalable file system for multimedia  

Microsoft Academic Search

Tiger Shark is a scalable, parallel file system designed to support interactive multime dia applications, particularly large-scale ones such as interactive television (ITV). Tiger Shark runs under the IBM AIX® operating system, on machines ranging from RS\\/6000™ desktop workstations to the SP2® parallel supercomputer. In addition to supporting continuous-time data, Tiger Shark provides scalability, high availability, and on-line system management,

Roger L. Haskin

1998-01-01

85

The parallel virtual file system for portals.  

SciTech Connect

This report presents the result of an effort to re-implement the Parallel Virtual File System (PVFS) using Portals as the transport. This report provides short overviews of PVFS and Portals, and describes the design and implementation of PVFS over Portals. Finally, the results of performance testing of both stock PVFS and PVFS over Portals are presented.

Schutt, James Alan

2004-04-01

86

Data hiding in the NTFS file system  

Microsoft Academic Search

In this paper we examine the methods of hiding data in the NTFS file system. Further we discuss the analysis techniques which can be applied to detect and recover data hidden using each of these methods. We focus on sophisticated data hiding where the goal is to prevent detection by forensic analysis. Obvious data hiding techniques, for example setting the

Ewa Huebner; Derek Bem; Cheong Kai Wee

2006-01-01

87

Pollution in P2P file sharing systems  

Microsoft Academic Search

One way tu combat fzP file sharing of copyrighted content is to deposit into the file sharing systems large volumes of polluted files. Without taking sides in the file sharing debate, in this paper we undertake a measurement study af the nature and magnitude of pollution in the FastTrack P2P network, currently the most popular PZP file sharing system. We

Jian Liang; Rakesh Kumar; Y. Xi; Keith W. Ross

2005-01-01

88

FSprof: An In-Kernel File System Operations Profiler  

Microsoft Academic Search

Developing efficient file systems is difficult. Often, profiling tools are useful for analyzing system bottlenecks and correcting them. Whereas there are several techniques to profile system call activ- ity or disk-block activity, there are no good tools to profile file systems—which logically reside below system calls and above disk drivers. We developed a tool called FSprof that instruments existing file

Nikolai Joukov; Charles P. Wright; Erez Zadok

89

17 CFR 250.57 - Notices and reports to be filed under section 33.  

Code of Federal Regulations, 2011 CFR

... Notices and reports to be filed under section 33. 250.57 Section 250.57 Commodity and Securities Exchanges SECURITIES...and Exemption of Various Financial Transactions 2 § 250.57 Notices and reports to be filed under...

2011-04-01

90

Performance Analysis and Optimization of the Hurricane File System on the K42 Operating System  

Microsoft Academic Search

The performance scalability of the Hurricane File System (HFS) is studied under the context of the K42 Operating System. Both systems were designed for scalability on large-scale, shared-memory, non-uniform memory access multiprocessors. However, scalability of HFS was never studied extensively. Microbenchmarks for reading, writing, creating, obtaining file attributes, and name lookup were used to measure scalability. As well, a macrobenchmark

David Tam

2003-01-01

91

On the duality of data-intensive file system design: reconciling HDFS and PVFS  

Microsoft Academic Search

Data-intensive applications fall into two computing styles: Internet services (cloud computing) or high-performance computing (HPC). In both categories, the underlying file system is a key component for scalable application performance. In this paper, we explore the similarities and differences between PVFS, a parallel file system used in HPC at large scale, and HDFS, the primary storage system used in cloud

Wittawat Tantisiriroj; Seung Woo Son; Swapnil Patil; Samuel J. Lang; Garth Gibson; Robert B. Ross

2011-01-01

92

An Automated Document Filing System  

Microsoft Academic Search

TEXPROS (TEXt PROcessing System) is an automatic document processing system which supports text-based information representation and manipulation, conveying meanings from stored information within office document texts. A dual modeling approach is employed to describe office documents and support document search and retrieval. The frame templates for representing document classes are organized to form a document type hierarchy. Based on its

Xien Fan; Qianhong Liu; Peter Ng

1999-01-01

93

Replication in the Harp File System Barbara Liskov  

E-print Network

Replication in the Harp File System Barbara Liskov Sanjay Ghemawat Robert Gruber Paul Johnson Liuba to respondHarp file system. Harp is a replicated Unix file system before replying to the client. The system good performance be- failovers.cause it allows us to trade disk accesses for network com- Harp is one

94

FiST: A Language for Stackable File Systems  

Microsoft Academic Search

Traditional file system development is difficult. Stack- able file systems promise to ease the development of file systems by offering a mechanism for incremental develop- ment. Unfortunately, existing methods often require writ- ing complex low-level kernel code that is specific to a sin- gle operating system platform and also difficult to port. We propose a new language, FiST, to describe

Erez Zadok; Jason Nieh

2000-01-01

95

File System Performance and Transaction Support Margo Ilene Seltzer  

E-print Network

is a log-structured file system, where writes are bundled and written sequentially. Empirical evidence ................................................................ 3 2.1.1.1. IBM's Extent Based File System ..................................................... 3 2

California at Irvine, University of

96

Examining Semantics In Multi-Protocol Network File Systems  

Microsoft Academic Search

Network file systems provide a robust tool that can be used by many physically dispersed clients. They provide clients with a means of permanent storage and communication. In order to exploit the resources available on a network file system server, a client must use the protocol of the server's file system. Although the goal of any protocol is to guarantee

Edward P. A. Hogan; Garth A. Gibson; Gregory R. Ganger

97

The Rules of Time on NTFS File System  

E-print Network

The Rules of Time on NTFS File System K.P. Chow, Frank Y.W. Law, Michael Y.K. Kwan, K.Y. Lai by human or software 5 #12;1. Introduction (Cont.) · NTFS File System ­ First introduced in 1993 in Windows performance ­ Better reliability and security ­ Uses File System Journaling 6 #12;2. Proposed Approach

Almulhem, Ahmad

98

A History of the Andrew File System  

SciTech Connect

Derrick Brashear and Jeffrey Altman will present a technical history of the evolution of Andrew File System starting with the early days of the Andrew Project at Carnegie Mellon through the commercialization by Transarc Corporation and IBM and a decade of OpenAFS. The talk will be technical with a focus on the various decisions and implementation trade-offs that were made over the course of AFS versions 1 through 4, the development of the Distributed Computing Environment Distributed File System (DCE DFS), and the course of the OpenAFS development community. The speakers will also discuss the various AFS branches developed at the University of Michigan, Massachusetts Institute of Technology and Carnegie Mellon University.

None

2011-02-22

99

Measurement and Analysis of Large-Scale Enterprise Network File System Workloads  

Microsoft Academic Search

Network file system usage has grown significantly in re- cent years due to the desire to lower costs, improve storage utilization and ease administration by consolidating stor - age. In order to understand how future network file systems should be designed, it is critical to have a detailed under- standing of they are currently used in practice. We conducted an

Andrew W. Leung; Shankar Pasupathy; Garth Goodson; Ethan L. Miller

100

Multidimensional Index on Hadoop Distributed File System  

Microsoft Academic Search

In this paper, we present an approach to construct a built-in block-based hierarchical index structures, like R-tree, to organize data sets in one, two, or higher dimensional space and improve the query performance towards the common query types (e.g., point query, range query) on Hadoop distributed file system (HDFS). The query response time for data sets that are stored in

Haojun Liao; Jizhong Han; Jinyun Fang

2010-01-01

101

File Design for the Search System, 3RIP.  

National Technical Information Service (NTIS)

The file design of the search system part of an interactive search and editing system, 3RIP, is described. A scatter-stored and compact inverted file is used to search a primary file of up to 4 million records containing on the order of 10-E9 characters o...

R. Larsson

1975-01-01

102

Tiger Shark - a scalable file system for multimedia  

E-print Network

Tiger Shark is a scalable, parallel file system designed to support interactive multimedia applications, particularly large-scale ones such as interactive television (ITV). Tiger Shark runs under the IBM AIX operating system, on machines ranging from RS/6000 desktop workstations to the SP2 parallel supercomputer. In addition to supporting continuous-time data, Tiger Shark provides scalability, high availability, and on-line system management, all of which are crucial in large-scale video servers. These latter features also enable Tiger Shark to support non-multimedia applications such as scientific computing, data mining, digital library, and scalable network file servers. Tiger Shark has been employed in a number of customer ITV trials. Based on experience obtained from these trials, Tiger Shark has recently been released in several IBM video server products. This paper describes the architecture and implementation of Tiger Shark, discusses the experience gained from trials, and compa...

Roger L. Haskin

1998-01-01

103

Experience Building a File System on a Highly Modular Operating System  

Microsoft Academic Search

File systems that employ caching have been built for many years. However, most work in file systems has been done as part of monolithic operating systems. In this paper we give our experience with building a high-performance distributed file system on Spring, a highly modular operating system where system services such as file systems are provided as user-level servers. The

Michael N. Nelson; Yousef A. Khalidi; Peter W. Madany

1993-01-01

104

Design and Implementation of a Metadata-rich File System  

SciTech Connect

Despite continual improvements in the performance and reliability of large scale file systems, the management of user-defined file system metadata has changed little in the past decade. The mismatch between the size and complexity of large scale data stores and their ability to organize and query their metadata has led to a de facto standard in which raw data is stored in traditional file systems, while related, application-specific metadata is stored in relational databases. This separation of data and semantic metadata requires considerable effort to maintain consistency and can result in complex, slow, and inflexible system operation. To address these problems, we have developed the Quasar File System (QFS), a metadata-rich file system in which files, user-defined attributes, and file relationships are all first class objects. In contrast to hierarchical file systems and relational databases, QFS defines a graph data model composed of files and their relationships. QFS incorporates Quasar, an XPATH-extended query language for searching the file system. Results from our QFS prototype show the effectiveness of this approach. Compared to the de facto standard, the QFS prototype shows superior ingest performance and comparable query performance on user metadata-intensive operations and superior performance on normal file metadata operations.

Ames, S; Gokhale, M B; Maltzahn, C

2010-01-19

105

Digital Libraries: The Next Generation in File System Technology.  

ERIC Educational Resources Information Center

Examines file sharing within corporations that use wide-area, distributed file systems. Applications and user interactions strongly suggest that the addition of services typically associated with digital libraries (content-based file location, strongly typed objects, representation of complex relationships between documents, and extrinsic…

Bowman, Mic; Camargo, Bill

1998-01-01

106

Silberschatz, Galvin and GagneOperating System Concepts Chapter 12: File System  

E-print Network

Silberschatz, Galvin and GagneOperating System Concepts Chapter 12: File System Implementation #12;12.2 Silberschatz, Galvin and GagneOperating System Concepts Layered File System and File Control Block #12;12.3 Silberschatz, Galvin and GagneOperating System Concepts In-Memory File System Structures #12;12.4 Silberschatz

Yang, Zijiang "James"

107

Improving file system reliability with I\\/O shepherding  

Microsoft Academic Search

We introduce a new reliability infrastructure for file systems called I\\/O shepherding. I\\/O shepherding allows a file system developer to craft nuanced reliability policies to detect and recover from a wide range of storage system failures. We incorporate shepherding into the Linux ext3 file system through a set of changes to the consistency management subsystem, layout engine, disk scheduler, and

Haryadi S. Gunawi; Vijayan Prabhakaran; Swetha Krishnan; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau

2007-01-01

108

Cryptographic Security for a High-Performance Distributed File System  

Microsoft Academic Search

Storage systems are increasingly subject to attacks. Cryptographic file systems mitigate the danger of exposing data by using encryption and integrity protection methods and guarantee end-to-end security for their clients. This paper describes a generic design for cryptographic file systems and its realization in a distributed storage-area network (SAN) file system. Key management is integrated with the meta-data service of

Roman Pletka; Christian Cachin

2007-01-01

109

Silvabase: A flexible data file management system  

NASA Technical Reports Server (NTRS)

The need for a more flexible and efficient data file management system for mission planning in the Mission Operations Laboratory (EO) at MSFC has spawned the development of Silvabase. Silvabase is a new data file structure based on a B+ tree data structure. This data organization allows for efficient forward and backward sequential reads, random searches, and appends to existing data. It also provides random insertions and deletions with reasonable efficiency, utilization of storage space well but not at the expense of speed, and performance of these functions on a large volume of data. Mission planners required that some data be keyed and manipulated in ways not found in a commercial product. Mission planning software is currently being converted to use Silvabase in the Spacelab and Space Station Mission Planning Systems. Silvabase runs on a Digital Equipment Corporation's popular VAX/VMS computers in VAX Fortran. Silvabase has unique features involving time histories and intervals such as in operations research. Because of its flexibility and unique capabilities, Silvabase could be used in almost any government or commercial application that requires efficient reads, searches, and appends in medium to large amounts of almost any kind of data.

Lambing, Steven J.; Reynolds, Sandra J.

1991-01-01

110

Different File Systems Data Access Support on MapReduce  

Microsoft Academic Search

In this paper, the interface between MapReduce and different storage systems is proposed. MapReduce based computing platform can access various file systems by the interface without modifying the existing computing system so that to simplify the construction of distributed applications. Different file systems can be configured and get quick switch by the interface. The interface is also integrated in Hadoop

Zeng Dadan; Chen Zhebing; Wang Jianpu; Zhou Minqi; Zhou Aoying

2009-01-01

111

Performance of the MPI Based File Share System  

Microsoft Academic Search

The current Internet traffics depend more on the P2P type communication than the legacy client-server type communication. The P2P communication has been applied to diverse systems such as the VoIP and the file sharing system for the P2P potential ability. The distributed file sharing system over the P2P network can especially provide the quick search, while the file accesses from

Daisuke Tsukamoto; Takuo Nakashima

2011-01-01

112

Cryptographic Security for a High-Performance Distributed File System  

Microsoft Academic Search

Storage systems are increasingly subject to attacks. Cryp- tographic file systems mitigate the danger of exposing data by using encryption and integrity protection methods and guarantee end-to-end security for their clients. This pa- per describes a generic design for cryptographic file sys- tems and its realization in a distributed storage-area net- work (SAN) file system. Key management is integrated with

Roman Pletka; Christian Cachin

2007-01-01

113

Improving file system reliability with I\\/O shepherding  

Microsoft Academic Search

We introduce a new reliability infrastructure for file syste ms called I\\/O shepherding. I\\/O shepherding allows a file system developer to craft nuanced reliability policies to detect and recover from a wide range of storage system failures. We incorporate shepherding into the Linux ext3 file system through a set of changes to the consi s- tency management subsystem, layout engine,

Haryadi S. Gunawi; Vijayan Prabhakaran; Swetha Krishnan; Andrea C. Arpaci-dusseau; Remzi H. Arpaci-dusseau

2007-01-01

114

Methods of Information Hiding and Detection in File Systems  

Microsoft Academic Search

Multiple methods of information hiding can be used by criminals to conceal incriminating data. The FAT and NTFS file systems are the most commonly used file systems in operating systems today, and therefore are the most exploited. Most methods of information hiding can be detected using forensic tool kits designed specifically for cyber crime investigators. The purpose of this paper

Jeremy Davis; Joe MacLean; David Dampier

2010-01-01

115

Integrating the Spiralog File System into the OpenVMS Operating System  

Microsoft Academic Search

Digital' s Spiralog file system is a log-structured file system that makes extensive use of write- back caching. Its technology is substantially different from that of the traditional OpenVMS file system, known as Files-11. The integration of the Spiralog file system into the OpenVMS environment had to ensure that existing appli- cations ran unchanged and at the same time had

Mark A. Howell; Julian M. Palmer

116

A Capability-Based Transparent Cryptographic File System  

Microsoft Academic Search

Data on the file system in mobile internetworked work- ing environments are exposed data to a number of threats ranging from physical theft of storage devices to indus- trial espionage and intelligence activities. This paper de- scribes a fully transparent, capability-based file system se- curity mechanism for use in heterogeneous computing envi- ronments with emphasis on the implementation on the

Frank Graf; Stephen D. Wolthusen

2005-01-01

117

Multimedia File Systems Survey: Approaches for Continuous Media Disk Scheduling  

Microsoft Academic Search

We understand multimedia data processing as the handling of audio and video data together with traditional data like text and images. This multimedia data is to be stored with and by a multimedia file system which comprises one or more of the following three issues: (1) The file system can rely on various types of different physical storage devices; however,

Ralf Steinmetz

1995-01-01

118

Replication in the Harp File System Barbara Liskov  

E-print Network

Replication in the Harp File System Barbara Liskov Sanjay Ghemawat Robert Gruber Paul Johnson Liuba, MA 02139 Harp uses the primary copy replicationAbstract technique [1, 26, 27]. In this method, client and implementation of the with other backup servers and waits for them to respondHarp file system. Harp

Gummadi, Ramakrishna

119

Replication in the Harp File System Barbara Liskov  

E-print Network

Replication in the Harp File System Barbara Liskov Sanjay Ghemawat Robert Gruber Paul Johnson Liuba, MA 02139 Harp uses the primary copy replication Abstract technique [1, 26, 27]. In this method and implementation of the with other backup servers and waits for them to respond Harp file system. Harp

120

A high performance multi-structured file system design  

Microsoft Academic Search

File system I\\/O is increasingly becoming a performance bottleneck in large distributed computer systems. This is due to the increased file I\\/O demands of new applications, the inability of any single storage structure to respond to these demands, and the slow decline of, disk access times (latency and seek) relative to the rapid increase in CPU speeds, memory size, and

Keith Muller; Joseph Pasquale

1991-01-01

121

FUSE-NT: Userspace File Systems for Windows NT  

Microsoft Academic Search

This paper presents our progress towards FUSE-NT, a Windows port of Filesystem in Userspace (FUSE). FUSE is a service that allows users to implement func- tional file systems in userspace. It provides a simple but suciently powerful set of APIs which allow users to design and implement original file systems without dealing with the complications of kernel programming. Currently, FUSE

Evan Driscoll; Jonathan Beavers; Hidetoshi Tokuda

122

Storage virtualization using a block-device file system  

Microsoft Academic Search

The design and organization of modern file systems has been traditionally driven by practical considerations related to the physical properties of computer disks Storage virtualization makes such considerations largely irrelevant, and file-system designs based on them perform sub-optimally in a virtual storage environment. One important example of this phenomenon is the relationship between disk seek times and the placement and

Sorin Faibish; Stephen Fridella; Peter Bixby; Uday Gupta

2008-01-01

123

Graffiti: A Framework for Testing Collaborative Distributed File System  

E-print Network

Graffiti: A Framework for Testing Collaborative Distributed File System Metadata C. MALTZAHN metadata for online content [21] we present Graffiti, a distributed organization layer for collaboratively sharing rich metadata across heterogeneous file systems. The primary purpose of Graffiti is to provide

Maltzahn, Carlos

124

A Taxonomy and Survey on Distributed File Systems  

Microsoft Academic Search

Applications that process large volumes of data (such as, search engines, grid computing applications, data mining applications, etc.) require a backend infrastructure for storing data. The distributed file system is the central component for storing data infrastructure. There have been many projects focused on network computing that have designed and implemented distributed file systems with a variety of architectures and

Doan Thanh Tran; Subaji Mohan; Eunmi Choi; SangBum Kim; Pilsung Kim

2008-01-01

125

JigDFS: A secure distributed file system  

Microsoft Academic Search

Ubiquitous connectivity and availability of P2P resources creates opportunities for building new services. This paper describes Jigsaw Distributed File System (JigDFS) which can be used to securely store and retrieve files on a P2P network anonymously. JigDFS is designed to provide strong encryption and a certain level of plausible deniability. Files in JigDFS are sliced into small segments using an

Jiang Bian; Remzi Seker

2009-01-01

126

Data Grids: Deployment and Evaluation of Grid Datafarm - Gfarm file system - as an Internet general-purpose file system  

Microsoft Academic Search

This poster presents the deployment and evaluation of Gfarm file system - a reference implementation of Grid Datafarm architecture - as a general-purpose Internet file system. Gfarm was installed, configured and functionally analyzed in an emulated network environment provided by NIST Net. The behavior of the scenario was observed when varying network conditions such as bandwidth and delay, facing the

Sérgio Takeo Kofuji; Anderson Tadeu Milochi

127

Comparison of leading parallel NAS file systems on commodity hardware  

SciTech Connect

High performance computing has experienced tremendous gains in system performance over the past 20 years. Unfortunately other system capabilities, such as file I/O, have not grown commensurately. In this activity, we present the results of our tests of two leading file systems (GPFS and Lustre) on the same physical hardware. This hardware is the standard commodity storage solution in use at LLNL and, while much smaller in size, is intended to enable us to learn about differences between the two systems in terms of performance, ease of use and resilience. This work represents the first hardware consistent study of the two leading file systems that the authors are aware of.

Hedges, R; Fitzgerald, K; Gary, M; Stearman, D M

2010-11-08

128

Stochastic Petri net analysis of a replicated file system  

NASA Technical Reports Server (NTRS)

A stochastic Petri-net model of a replicated file system is presented for a distributed environment where replicated files reside on different hosts and a voting algorithm is used to maintain consistency. Witnesses, which simply record the status of the file but contain no data, can be used in addition to or in place of files to reduce overhead. A model sufficiently detailed to include file status (current or out-of-date), as well as failure and repair of hosts where copies or witnesses reside, is presented. The number of copies and witnesses is a parameter of the model. Two different majority protocols are examined, one where a majority of all copies and witnesses is necessary to form a quorum, and the other where only a majority of the copies and witnesses on operational hosts is needed. The latter, known as adaptive voting, is shown to increase file availability in most cases.

Bechta Dugan, Joanne; Ciardo, Gianfranco

1989-01-01

129

New System for Secure Cover File of Hidden Data in the Image Page within Executable File Using Statistical Steganography Techniques  

E-print Network

A Previously traditional methods were sufficient to protect the information, since it is simplicity in the past does not need complicated methods but with the progress of information technology, it become easy to attack systems, and detection of encryption methods became necessary to find ways parallel with the differing methods used by hackers, so the embedding methods could be under surveillance from system managers in an organization that requires the high level of security. This fact requires researches on new hiding methods and cover objects which hidden information is embedded in. It is the result from the researches to embed information in executable files, but when will use the executable file for cover they have many challenges must be taken into consideration which is any changes made to the file will be firstly detected by untie viruses, secondly the functionality of the file is not still functioning. In this paper, a new information hiding system is presented. The aim of the proposed system is to ...

Islam, Rafiqul; Zaidan, A A; Zaidan, B B

2010-01-01

130

Can High-Performance Interconnects Benefit Hadoop Distributed File System? Sayantan Sur, Hao Wang, Jian Huang, Xiangyong Ouyang and Dhabaleswar K. Panda  

E-print Network

Can High-Performance Interconnects Benefit Hadoop Distributed File System? Sayantan Sur, Hao Wang and has been adopted by many organizations. The Hadoop Distributed File System (HDFS) lies at the heart, HDFS has also become the underlying file system for the Hadoop database (HBase), that is an Open

Panda, Dhabaleswar K.

131

Re-engineering the Los Alamos Common File System  

SciTech Connect

The Los Alamos National Laboratory's Common File System is being substantially upgraded so it will continue to meet the future data storage needs of the Laboratory and other sites. The nature of computing is changing with the advent of workstations, different work loads, and standard approaches to networking and operating systems. We reviewed the pros and cons of the Common File System and numerous existing and planned systems. Our conclusion was that the Common File System was a valuable resource with many strengths that should be preserved for the future. We have arrived at a set of recommendations for changes and additions that we feel will allow the Common File System to continue to meet data storage needs in both the short and long term. The recommendations for 1990--1992 support the transition to Unix on supercomputers and support high performance networking. The recommendations for 1992--1995 support the transition to a Unix type file system that provides a significant level of file location transparency. For 1995--2000 the recommendations are necessarily less precise but support the notion of standard security, transparent file systems and faster networking. 11 refs.

Christman, R.D.; Cook, D.P.; Mercier, C.W.

1990-01-01

132

17 CFR 242.608 - Filing and amendment of national market system plans.  

Code of Federal Regulations, 2013 CFR

...Filing and amendment of national market system plans. 242.608 Section 242.608...Nms-Regulation of the National Market System § 242.608 Filing and amendment of national market system plans. (a) Filing of national...

2013-04-01

133

COMPARING THE XAM API WITH FILE SYSTEM PROGRAMMING STEPHEN J. TODD  

E-print Network

COMPARING THE XAM API WITH FILE SYSTEM PROGRAMMING BY STEPHEN J. TODD B.S.C.S. , University of New ................................................................................ 3 2. THE XAM API TO THE FILE SYSTEM API............................................ 37 6. XAM BENEFITS VERSUS THE FILE SYSTEM

New Hampshire, University of

134

5 CFR 293.504 - Composition of, and access to, the Employee Medical File System.  

Code of Federal Regulations, 2010 CFR

...Composition of, and access to, the Employee Medical File System. 293.504 Section 293...REGULATIONS PERSONNEL RECORDS Employee Medical File System Records § 293.504 Composition of, and access to, the Employee Medical File System. (a) All employee...

2010-01-01

135

5 CFR 293.504 - Composition of, and access to, the Employee Medical File System.  

Code of Federal Regulations, 2011 CFR

...Composition of, and access to, the Employee Medical File System. 293.504 Section 293...REGULATIONS PERSONNEL RECORDS Employee Medical File System Records § 293.504 Composition of, and access to, the Employee Medical File System. (a) All employee...

2011-01-01

136

Silberschatz, Galvin and Gagne 2009Operating System Concepts 8th Edition Lecture 19: File System  

E-print Network

Silberschatz, Galvin and Gagne ©2009Operating System Concepts­ 8th Edition Lecture 19: File System Implementation (Ch 11) #12;11.2 Silberschatz, Galvin and Gagne ©2009Operating System Concepts ­ 8th Edition File System #12;11.3 Silberschatz, Galvin and Gagne ©2009Operating System Concepts ­ 8th Edition File

Iamnitchi, Adriana

137

Configuration Management File Manager Developed for Numerical Propulsion System Simulation  

NASA Technical Reports Server (NTRS)

One of the objectives of the High Performance Computing and Communication Project's (HPCCP) Numerical Propulsion System Simulation (NPSS) is to provide a common and consistent way to manage applications, data, and engine simulations. The NPSS Configuration Management (CM) File Manager integrated with the Common Desktop Environment (CDE) window management system provides a common look and feel for the configuration management of data, applications, and engine simulations for U.S. engine companies. In addition, CM File Manager provides tools to manage a simulation. Features include managing input files, output files, textual notes, and any other material normally associated with simulation. The CM File Manager includes a generic configuration management Application Program Interface (API) that can be adapted for the configuration management repositories of any U.S. engine company.

Follen, Gregory J.

1997-01-01

138

NANDFS: a flexible flash file system for RAM-constrained systems  

Microsoft Academic Search

NANDFS is aflash file system that exposes a memory-performance tradeoff to system integrators. The file system can be configured to use a large amount of RAM, in which case it delivers excel- lent performance. In particular, when NANDFS is configured with the same amount of RAM that YAFFS2 uses, the performance of the two file systems is comparable (YAFFS2 is

Aviad Zuck; Ohad Barzilay; Sivan Toledo

2009-01-01

139

The Rio File Cache: Surviving Operating System Crashes  

Microsoft Academic Search

One of the fundamental limits to high-performance, high-reliability file systems is memory's vulnerability to system crashes. Because memory is viewed as unsafe, systems periodically write data back to disk. The extra disk traffic lowers performance, and the delay period before data is safe lowers reliability. The goal of the Rio (RAM I\\/O) file cache is to make ordinary main memory

Peter M. Chen; Wee Teck Ng; Subhachandra Chandra; Christopher M. Aycock; Gurushankar Rajamani; David E. Lowell

1996-01-01

140

Research on hadoop-based enterprise file cloud storage system  

Microsoft Academic Search

In order to solve the problem that enterprise-level users mass data storage and high-speed data processing services growth, and the traditional storage system can not meet the data services business growth, enterprise file cloud storage system is proposed. It is based on Hadoop, uses Linux cluster technology, distributed file systems and cloud computing framework, provides large-scale data storage and data

Da-Wei Zhang; Fu-Quan Sun; Xu Cheng; Chao Liu

2011-01-01

141

A CDP method in an object-based file system  

NASA Astrophysics Data System (ADS)

Recent advances in large-capacity, low-cost storage devices have led to active research in design of large-scale storage system built from commodity devices. These storage systems are composed of thousands of storage device and require an efficient file system to provide high system bandwidth and petabyte-scale data storage. Object-based file system integrates advantage of both NAS and SAN, can be applied in above environment. Continuous data protection (CDP) is a methodology that continuously captures or tracks data modifications and stores changes independent of the primary data, enabling recovery points from any point in the past. All changes to files and file metadata are stored and managed. A CDP method in Object-based file system is presented in this thesis to improve the system reliability. Firstly, we can get detail at byte level of every write request because data protection operates at the file system level. It can consume less storage space. Secondly, every object storage server can compute the recovery strip data object independently to decrease the recovery time. Thirdly a journal-like metadata management way is introduced to provide metadata optimization for CDP.

Yao, Jie; Cao, Qiang; Li, Huaiyang

2008-12-01

142

Extending ACID Semantics to the File System A Dissertation Presented  

E-print Network

be aborted without side effects. We have designed a file system that exports ACID transactions to user the performance of Ext3. ii #12;To George: his mother's zaika--a cute little bunny, his father's little crocodile

Zadok, Erez

143

TABLEFS: Enhancing Metadata Efficiency in the Local File System  

E-print Network

TABLEFS: Enhancing Metadata Efficiency in the Local File System Kai Ren, Garth Gibson CMU-PDL-13 Pittsburgh, PA 15213-3890 Acknowledgements: This research is supported in part by The Gordon and Betty Moore

144

Educational Use of Toshiba TDF-500 Medical Image Filing System for Teaching File Archiving and Viewing  

NASA Astrophysics Data System (ADS)

The authors have been using medical image filing system TOSHIBA TDIS-FILE as a teaching files archiving and viewing at University of Tokyo, Hospital, Department of Radiology. Image display on CRT was proven sufficient for the purpose of education for small groups of students, as well as residents. However, retrieval time for archived images, man-machine interface, and financial expenses are not in a satisfactory level yet. The authors also implemented flexible retrieval scheme for diagnostic codes, which has been proven sophisticated. These kinds of software utilities, as well as hardware evolution, are essential for this kind of instruments to be used as potential component of PACSystem. In our department, PACS project is being carried on. In the system, TOSHIBA AS3160 workstation (=SUN 3/160) handles all user interfaces including controls of medical image displays, examination data bases, and interface with HIS.

Kimura, Michio; Yashiro, Naobumi; Kita, Koichi; Tani, Yuichiro; IIO, Masahiro

1989-05-01

145

FRASH: Hierarchical File System for FRAM and Flash  

Microsoft Academic Search

In this work, we develop novel file system, FRASH, for byte-addressable NVRAM (FRAM[1]) and NAND Flash device. Byte addressable\\u000a NVRAM and NAND Flash is typified by the DRAM-like fast access latency and high storage density, respectively. Hierarchical\\u000a storage architecture which consists of byte-addressable NVRAM and NAND Flash device can bring synergy and can greatly enhance\\u000a the efficiency of file system

Eun-ki Kim; Hyungjong Shin; Byung-gil Jeon; Seokhee Han; Jaemin Jung; Youjip Won

2007-01-01

146

A groupware interface to a shared file system  

E-print Network

fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: ________________________________ Du Li (Chair of Committee) ________________________________ Frank Shipman (Member... Collin Faltemier, B.S., University of Illinois ? Urbana Chair of Advisory Committee: Dr. Du Li Current shared file systems (NFS and SAMBA) are based on the local area network model. To these file systems, performance is the major issue. However...

Faltemier, Timothy Collin

2005-02-17

147

File Systems in Unix Norman Matloff  

E-print Network

, or with full path names. Look at the file `salt' above. If we are in the directory `water', we can refer water/salt If we are in the directory `misc', we can write either ../salt or ~/water/salt If we are not in any of Jill's directories, we can write ~jill/water/salt In any case, the full pathname will work

California at Davis, University of

148

Efficient file distribution in a flexible,wide-area file system  

E-print Network

WheelFS is a wide-area distributed file system designed to help applications cope with the challenges of sharing data over the wide-area network. A wide range of applications can use WheelFS as a storage layer because ...

Zhang, Irene Y. (Irene Yun)

2009-01-01

149

TidyFS: A Simple and Small Distributed File System Dennis Fetterly  

E-print Network

File System (GFS) and the Hadoop Dis- tributed File System (HDFS). TidyFS differs from these earlierTidyFS: A Simple and Small Distributed File System Dennis Fetterly Microsoft Research, Silicon file system that provides the abstractions neces- sary for data parallel computations on clusters

Liblit, Ben

150

A Patient Record-Filing System for Family Practice  

PubMed Central

The efficient storage and easy retrieval of quality records are a central concern of good family practice. Many physicians starting out in practice have difficulty choosing a practical and lasting system for storing their records. Some who have established practices are installing computers in their offices and finding that their filing systems are worn, outdated, and incompatible with computerized systems. This article describes a new filing system installed simultaneously with a new computer system in a family-practice teaching centre. The approach adopted solved all identifiable problems and is applicable in family practices of all sizes.

Levitt, Cheryl

1988-01-01

151

The Case for Reexamining Integrated File System Design  

Microsoft Academic Search

Research in integrated file systems—file sys- tems that support different types of data and applica- tions with diverse performance requirements—has stag- nated since the commercial failure of video-on-demand sys- tems in the 1990s. However, the past two years have seen an acceleration in the development and deployment of sev- eral new technologies aimed at web-based multimedia ap- plications. These technologies

Prashant Shenoy

2000-01-01

152

76 FR 48833 - Notice of Filings of Self-Certifications of Coal Capability Under the Powerplant and Industrial...  

Federal Register 2010, 2011, 2012, 2013

...Filings of Self-Certifications of Coal Capability Under the Powerplant and Industrial...electric powerplants submitted coal capability self-certifications to the Department...Register. ADDRESSES: Copies of coal capability self-certification filings are...

2011-08-09

153

78 FR 54879 - Notice of Filing of Self-Certification of Coal Capability Under the Powerplant and Industrial...  

Federal Register 2010, 2011, 2012, 2013

...Filing of Self-Certification of Coal Capability Under the Powerplant and Industrial...electric powerplant, submitted a coal capability self-certification to the Department...61(c). ADDRESSES: Copies of coal capability self-certification filings are...

2013-09-06

154

77 FR 74473 - Notice of Filing of Self-Certification of Coal Capability Under the Powerplant and Industrial...  

Federal Register 2010, 2011, 2012, 2013

...Filing of Self-Certification of Coal Capability Under the Powerplant and Industrial...electric powerplant, submitted a coal capability self- certification to the Department...61(c)) ADDRESSES: Copies of coal capability self-certification filings are...

2012-12-14

155

Essence: A Resource Discovery System Based on Semantic File Indexing  

E-print Network

to related projects, such as the Wide Area Information Servers (WAIS) system and the MIT Semantic File System cases index data faster than these systems. Our prototype generates WAIS-compatible indexes, allowing WAIS users to take advantage of the Essence indexing methods. Introduction In the past two years

Schwartz, Michael F.

156

Towards realistic file-system benchmarks with CodeMRI  

Microsoft Academic Search

Benchmarks are crucial to understanding software systems and assessing their performance. In file-system research, synthetic benchmarks are accepted and widely used as substitutes for more realistic and complex workloads. However, synthetic benchmarks are largely based on the benchmark writer's interpretation of the real workload, and how it exercises the system API. This is insufficient since even a simple operation through

Nitin Agrawal; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau

2008-01-01

157

DAFT: Disk Geometry-Aware File System Traversal Fanglu Guo Tzi-cker Chiueh  

E-print Network

's NTFS file system called DAFT (Disk gDAFT: Disk Geometry-Aware File System Traversal Fanglu Guo Tzi-cker Chiueh Symantec Research Labs system. Example applications that use bulk file access extensively are anti-virus (AV) scanner, file

Chiueh, Tzi-cker

158

A Segment-Level Adaptive Data Layout Scheme for Improved Load Balance in Parallel File Systems  

Microsoft Academic Search

Parallel file systems are designed to mask the ever- increasing gap between CPU and disk speeds via parallel I\\/O processing. While they have become an indispensable compo- nent of modern high-end computing systems, their inadequate performance is a critical issue facing the HPC community today. Conventionally, a parallel file system stripes a file across multiple file servers with a fixed

Huaiming Song; Yanlong Yin; Xian-He Sun; Rajeev Thakur; Samuel Lang

2011-01-01

159

The framework of a distributed file system for geospatial data management  

Microsoft Academic Search

In distributed file systems, the integral management of large and small files is very important for the performance of applications. Based on Google File System, we present a framework of distributed file system to improve the management of geospatial objects. By adopting the access locality and spatial relationships among geospatial objects, we extend the metadata in the master node and

Jifeng Cui; Chao Li; Chunxiao Xing; Yong Zhang

2011-01-01

160

Forensic Extraction of EFS-Encrypted Files in Live System Investigation  

Microsoft Academic Search

Encrypted files captured by acquiring a bit-by-bit image in the process of conventional forensic investigation are practically impossible to decrypt without knowing the key and the method of encryption. The Windows operating system provides the option to encrypt files using an encryption driver bundled with the New Technology File System (NTFS) file system, the so-called encrypting file system (EFS). EFS

Ewa Huebner; Derek Bem

2008-01-01

161

20 CFR 429.102 - How do I file a claim under this subpart?  

Code of Federal Regulations, 2010 CFR

...ADMINISTRATIVE CLAIMS UNDER THE FEDERAL TORT CLAIMS ACT AND RELATED STATUTES Claims Against the Government Under the Federal Tort Claims Act § 429.102 How do I file...the General Counsel, Office of General Law, P.O. Box 17788, Baltimore,...

2010-04-01

162

File Replication and Distribution System for Low Bandwidth Networks  

Microsoft Academic Search

In this paper, we introduce DISTREP, a multiplatform and operating system independent file distribution and replication package. It features dynamic distribution and low-overhead network connections that efficiently conserve network bandwidth. A complete replication to M machines of N bytes in DISTREP may only require a transfer of at least N bytes, less than the NM bytes that other systems require.

Daniel G. Pamintuan II; Eliezer A. Albacea

2002-01-01

163

TOXICS RELEASE INVENTORY - GEOGRAPHIC INFORMATION SYSTEM COVERAGE FILES  

EPA Science Inventory

Data extracted from the EPA Toxics Release Inventory (TRI) system for reporting year 1993 are written in Arc/INFO geographic information system (GIS) export file format (an ASCII data exchange format). The data are also summarized in tables out of the TRI public data release publ...

164

NCryptfs: A Secure and Convenient Cryptographic File System  

Microsoft Academic Search

Often, increased security comes at the expense of user convenience, performance, or compatibility with other systems. The right level of security depends on specific site and user needs, which must be carefully balanced. We have designed and built a new cryptographic file system called NCryptfs with the primary goal of allow- ing users to tailor the level of security vs.

Charles P. Wright; Michael C. Martino; Erez Zadok

2003-01-01

165

The design and implementation of tripwire: a file system integrity checker  

Microsoft Academic Search

At the heart of most computer systems is a file system. The file system contains user data, executable programs, configuration and authorization information, and (usually) the base executable version of the operating system itself. The ability to monitor file systems for unauthorized or unexpected changes gives system administrators valuable data for protecting and maintaining their systems. However, in environments of

Gene H. Kim; Eugene H. Spafford

1994-01-01

166

Hypervisor-based protection of sensitive files in a compromised system  

Microsoft Academic Search

One of the most fundamental issues in computer security is protecting sensitive files from unauthorized access. Traditional file protection tools run inside the target operating system, which hosts sensitive files. This makes previous approaches vulnerable in face of a compromised OS. To address this limitation, recent approaches seek for a good isolation by putting file system into a dedicated virtual

Junqing Wang; Miao Yu; Bingyu Li; Zhengwei Qi; Haibing Guan

2012-01-01

167

A trace-driven analysis of the UNIX 4.2 BSD file system  

Microsoft Academic Search

We analyzed the UNIX 4.2BSD file system by recording activity in trace files and writing programs to analyze the traces. The trace analysis shows that the average file system bandwidth needed per user is low (a few hundred bytes per second). Most of the files accessed are short, are open a short time, and are accessed sequentially. Most new information

John K. Ousterhout; Hervé Da Costa; David Harrison; John A. Kunze; Michael D. Kupfer; James G. Thompson

1985-01-01

168

Efficient methodology for implementation of Encrypted File System in User Space  

Microsoft Academic Search

The Encrypted File System (EFS) pushes encryption services into the file\\u000asystem itself. EFS supports secure storage at the system level through a\\u000astandard UNIX file system interface to encrypted files. User can associate a\\u000acryptographic key with the directories they wish to protect. Files in these\\u000adirectories (as well as their pathname components) are transparently encrypted\\u000aand decrypted with

Shishir Kumar; Sameer Kumar Jasra; Akshay Kumar Jain

2009-01-01

169

Dealing with the data deluge: file systems and storage technologies  

NASA Astrophysics Data System (ADS)

As defense and intelligence agencies seek to use the increasing amount of available data to make mission critical decisions on the battlefield, there is heavy emphasis on smart data and imagery collection: the capture, storage, and analysis necessary to drive real-time intelligence. This reality leads to an inevitable challenge-warfighters are increasingly swimming in sensors and drowning in data. With the millions, if not billions, of sensors in place that provide all-seeing reports of the combat environment, managing and tackling the overload is critical. This session highlights the capabilities of file systems and storage technologies that can interactively manage 100M+ files and 1PB+ single directory file systems.

Denson, David H.

2012-06-01

170

Silberschatz, Galvin and GagneOperating System Concepts Chapter 11: File-System  

E-print Network

Silberschatz, Galvin and GagneOperating System Concepts Chapter 11: File-System Interface #12;11.2 Silberschatz, Galvin and GagneOperating System Concepts File Concept Contiguous logical address space Types: Data numeric character binary Program #12;11.3 Silberschatz, Galvin and GagneOperating System

Yang, Zijiang "James"

171

Ceph: A Scalable, High-Performance Distributed File System  

Microsoft Academic Search

We have developed Ceph, a distributed file system that provides excellent performance, reliability, and scala- bility. Ceph maximizes the separation between data and metadata management by replacing allocation ta- bles with a pseudo-random data distribution function (CRUSH) designed for heterogeneous and dynamic clus- ters of unreliable object storage devices (OSDs). We leverage device intelligence by distributing data replica - tion,

Sage A. Weil; Scott A. Brandt; Ethan L. Miller; Darrell D. E. Long; Carlos Maltzahn

2006-01-01

172

MFS: an Adaptive Distributed File System for Mobile Hosts  

Microsoft Academic Search

Mobility is a critical feature of computer systems, and while wireless networks are common, most applications that run on mobile hosts lack flexible mechanisms for data access in an en- vironment with large and frequent variations in network connec- tivity. Such conditions arise, for example, in collaborative work applications, particularly when wireless and wired users share files or databases. In

Benjamin Atkin; Kenneth P. Birman

2003-01-01

173

HDFS+: Erasure Coding Based Hadoop Distributed File System  

Microsoft Academic Search

A simple replication-based mechanism has been used to achieve high data reliability of Hadoop Distributed File System (HDFS). However, replication based mechanisms have high degree of disk storage requirement since it makes copies of full block without consideration of storage size. Studies have shown that erasure-coding mechanism can provide more storage space when used as an alternative to replication. Also,

Fredrick RomanusIshengoma

2013-01-01

174

Volume Based Metadata Isolation in Blue Whale Cluster File System  

Microsoft Academic Search

The mainly traditional File Systems are constructed on single device where the metadata and data access interfere with each other which will lead to performance degradations. In this paper we propose a volume based mechanism in BWFS to separate metadata from data into different devices by isolations both in store location and IO path. Test result has verified the effectiveness

Jingliang Zhang; Chengxiang Si; Yajun Jia; Jiangang Zhang; Xiaoming Han; Lu Xu

2009-01-01

175

Data file audit for local taxation management information system  

Microsoft Academic Search

To address the task of data file audit for local taxation management information system (LTMIS), audit approach combined computer audit with traditional manual audit is presented in this paper. The audit task is accomplished by performing audits on the completeness of educational surtax collection, the reasonableness of tax collection and the schedule adjustment of tax collection. In a practical LTMIS

Feng Wang; Hongmei Zhang; Huifang Hou; Longju Yang; Hao Wang; Zian Cao; Chaoyang Wang

2012-01-01

176

GLIMPSE: A Tool to Search Through Entire File Systems  

Microsoft Academic Search

GLIMPSE, which stands for GLobal IMPlicit SEarch, provides indexing and query schemes for file systems. The novelty of glimpse is that it uses a very small index — in most cases 2-4% of the size of the text — and still allows very flexible full-text retrieval including Boolean queries, approximate matching (i.e., allowing misspel- ling), and even searching for regular

Udi Manber; Sun Wu

1994-01-01

177

Accurate and Efficient Replaying of File System Traces  

Microsoft Academic Search

Replaying traces is a time-honored method for bench- marking, stress-testing, and debugging systems—and more recently—forensic analysis. One benefit to replay- ing traces is the reproducibility of the exact set of op- erations that were captured during a specific workload. Existing trace capture and replay systems operate at dif- ferent levels: network packets, disk device drivers, net- work file systems, or

Nikolai Joukov; Timothy Wong; Erez Zadok

2005-01-01

178

20 CFR 30.102 - In general, how does an employee file a claim for additional impairment or wage-loss under Part E...  

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.102 In general, how does an employee file a claim for...

2014-04-01

179

20 CFR 30.102 - In general, how does an employee file a claim for additional impairment or wage-loss under Part E...  

Code of Federal Regulations, 2010 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.102 In general, how does an employee file a claim for...

2010-04-01

180

20 CFR 30.102 - In general, how does an employee file a claim for additional impairment or wage-loss under Part E...  

Code of Federal Regulations, 2012 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.102 In general, how does an employee file a claim for...

2012-04-01

181

20 CFR 30.102 - In general, how does an employee file a claim for additional impairment or wage-loss under Part E...  

Code of Federal Regulations, 2013 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.102 In general, how does an employee file a claim for...

2013-04-01

182

20 CFR 30.102 - In general, how does an employee file a claim for additional impairment or wage-loss under Part E...  

Code of Federal Regulations, 2011 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.102 In general, how does an employee file a claim for...

2011-04-01

183

The secret stridulatory file under the right tegmen in katydids
(Orthoptera, Ensifera, Tettigonioidea).
 

PubMed

Males of most species of crickets and katydids produce species-specific calling songs to attract conspecific females. The typical stridulatory apparatus of the Ensifera consists of a file-and-scraper system in the basal dorsal region of the forewings (tegmina): the file on the underside of the cubital vein of one tegmen is composed of a series of lamelliform teeth and is run against the sclerotized scraper at the edge of the other tegmen. The region directly distal of the cubital vein is often thin and glassy and serves to amplify and spread the sound. In stridulating crickets the tegmina are quite symmetrical with both the left and the right one containing a file, which is considered the ancestral condition (Béthoux 2012). Most of these crickets adopted a right-over-left wing overlap and use only the right file. The few extant species of the ancient group Hagloidea have bilaterally symmetrical tegmina, both with functional files, and individual males can change the overlap (Morris & Gwynne 1978). Katydids are distinguished by a left-over-right wing overlap, with a stridulatory file on the underside of the left tegmen, and a scraper on the right one, which usually is also equipped with a mirror as resonating structure. PMID:24989770

Chamorro-Rengifo, Juliana; Braun, Holger; Lopes-Andrade, Cristiano

2014-01-01

184

Analysis and Evolution of Journaling File Systems  

Microsoft Academic Search

We develop and apply two new methods for analyzing Þle sys- tem behavior and evaluating Þle system changes. First, seman- tic block-level analysis (SBA) combines knowledge of on-disk data structures with a trace of disk trafÞc to infer Þle system be- havior; in contrast to standard benchmarking approaches, SBA enables users to understand why the Þle system behaves as it

Vijayan Prabhakaran; Andrea C. Arpaci-dusseau; Remzi H. Arpaci-dusseau

2005-01-01

185

Analysis and Implementation of NTFS File System Based on Computer Forensics  

Microsoft Academic Search

NTFS, which restores and manages the important data, is a common file system in Windows Operating System,. Tapping and analyzing the useful data of the NTFS file system has become an important means of current computer forensic. Through detailed analysis and research on the storage principles of the NTFS file system, the object-oriented method is put forward to design NTFS

Zhang Kai; Cheng En; Gao Qinquan

2010-01-01

186

A DESIGN OF OPERATING SYSTEM FOR EASILY IMPLEMENTING EFFICIENT FILE SYSTEMS ???????????????? ??????OS???  

Microsoft Academic Search

ABSTRACT The OS kernel shouldprovid e a framework with which programmers can easily implement an efficient file system. With conventional frameworks, a file system has been embedded into the kernel for efficiency or otherwise constructed at the user level for ease of implementation. However, the former technique makes the implementation difficult, and the latter involves performance penalties. This thesis proposes

Kenichi Kourai

187

QMDS: a file system metadata management service supporting a graph data model-based query language  

Microsoft Academic Search

File system metadata management has become a bottleneck for many data-intensive applications that rely on high-performance file systems. Part of the bottleneck is due to the limitations of an almost 50-year-old interface standard with metadata abstractions that were designed at a time when high-end file systems managed less than 100 MB. Today's high-performance file systems store 7–9 orders of magnitude more

Sasha Ames; Maya Gokhale; Carlos Maltzahn

2012-01-01

188

QMDS: A File System Metadata Management Service Supporting a Graph Data Model-Based Query Language  

Microsoft Academic Search

File system metadata management has become a bottleneck for many data-intensive applications that rely on high-performance file systems. Part of the bottleneck is due to the limitations of an almost 50 year old interface standard with metadata abstractions that were designed at a time when high-end file systems managed less than 100MB. Today's high- performance file systems store 7 to

Sasha Ames; Maya B. Gokhale; Carlos Maltzahn

2011-01-01

189

Meta-data Snapshotting: A Simple Mechanism for File System Consistency  

Microsoft Academic Search

File system consistency frequently involves a choice between raw performance and integrity guarantees. A few software-based solutions for this problem have appeared and are currently being used on some commercial operating systems; these include log-structured file systems, journaling file systems, and soft updates. In this paper, we propose meta-data snapshotting as a low-cost, scalable, and simple mechanism that provides file

Livio B Soares; Orran Y Krieger; Dilma Da Silva

2004-01-01

190

Meta-data snapshotting: a simple mechanism for file system consistency  

Microsoft Academic Search

File system consistency frequently involves a choice between raw performance and integrity guarantees. A few software-based solutions for this problem have appeared and are currently being used on some commercial operating systems; these include log-structured file systems, journaling file systems, and soft updates. In this paper, we propose meta-data snapshotting as a low-cost, scalable, and simple mechanism that provides file

Livio B Soares; Orran Y Krieger; Dilma Da Silva

2003-01-01

191

28 CFR 58.7 - Procedures for Completing Uniform Forms of Trustee Final Reports in Cases Filed Under Chapters 7...  

...in Cases Filed Under Chapters 7, 12, and 13 of the Bankruptcy Code. 58.7 Section 58.7 Judicial Administration DEPARTMENT...in Cases Filed Under Chapters 7, 12, and 13 of the Bankruptcy Code. (a) UST Form 101-7-TFR, Chapter 7 Trustee's...

2014-07-01

192

Part III: AFS - A Secure Distributed File System  

SciTech Connect

AFS is a secure distributed global file system providing location independence, scalability and transparent migration capabilities for data. AFS works across a multitude of Unix and non-Unix operating systems and is used at many large sites in production for many years. AFS still provides unique features that are not available with other distributed file systems even though AFS is almost 20 years old. This age might make it less appealing to some but with IBM making AFS available as open-source in 2000, new interest in use and development was sparked. When talking about AFS, people often mention other file systems as potential alternatives. Coda (http://www.coda.cs.cmu.edu/) with its disconnected mode will always be a research project and never have production quality. Intermezzo (http://www.inter-mezzo.org/) is now in the Linux kernel but not available for any other operating systems. NFSv4 (http://www.nfsv4.org/) which picked up many ideas from AFS and Coda is not mature enough yet to be used in serious production mode. This article presents the rich features of AFS and invites readers to play with it.

Wachsmann, A.; /SLAC

2005-06-29

193

CITI Technical Report 05-02 Scaling NFSv4 with Parallel File Systems  

E-print Network

to massive data stores. Parallel file systems give high throughput within a LAN, but cross-site data global access to massive data stores. Parallel file systems give high throughput within a LAN, but crossCITI Technical Report 05-02 Scaling NFSv4 with Parallel File Systems Dean Hildebrand Peter Honeyman

Honeyman, Peter

194

Novel Filing Systems Applicable to an Automated Office: A State-of-the-Art Study.  

ERIC Educational Resources Information Center

Examines novel computer filing systems which have particular application to office information storage and retrieval requirements. A variety of filing systems and their major characteristics are reviewed, ranging from network-based file servers to digital image storage and retrieval systems. Desirable characteristics of a modern electronic office…

Restorick, F. Mark

1986-01-01

195

Cryptographic File Systems Performance: What You Don't Know Can Hurt You  

Microsoft Academic Search

Securing data is more important than ever, yet cryp- tographic file systems still have not received wide use. One barrier to the adoption of cryptographic file systems is that the performance impact is assumed to be too high, but in fact is largely unknown. In this paper we first survey available cryptographic file systems. Second, we perform a performance comparison

Charles P. Wright; Jay Dave; Erez Zadok

2003-01-01

196

Crossing the Chasm: Sneaking a Parallel File System into Hadoop Wittawat Tantisiriroj, Swapnil Patil, Garth Gibson  

E-print Network

Crossing the Chasm: Sneaking a Parallel File System into Hadoop Overview Wittawat Tantisiriroj (typically not support POSIX) · Hadoop & Hadoop distributed file system (HDFS) · Distribute data across performance is comparable to HDFS Experiment Results Hadoop framework Extensible file system API PVFS JNI shim

197

Data-intensive file systems for Internet services: A rose by any other name ...  

E-print Network

, Hadoop distributed file system (HDFS) and Amazon S3, are defining this new purpose-built paradigm shipping are found to be different, but supportable in parallel file systems. Performance of HadoopData-intensive file systems for Internet services: A rose by any other name ... Wittawat

198

Design of an Active Storage Cluster File System for DAG Workflows  

E-print Network

Design of an Active Storage Cluster File System for DAG Workflows Patrick Donnelly Department, a cluster file system designed to meet the needs of DAG-structured workflows. Today's premier cluster file system Hadoop is commonly used to support large peta-scale data sets on commodity hardware and to exploit

Thain, Douglas

199

Data searching and implementing fault tolerance using sector sphere file system  

Microsoft Academic Search

By Moores law, the amount of digital data has been increasing faster, In this paper, to manage and analyze very large data sets, Sector\\/Sphere file systems was introduced, the design and implementation of a distributed file system called sector and an associated programming framework called Sphere, the proposed system describes the directives Sector distribute the files with Sphere that supports

R. Laxmi Saranya; P. Sujatha

2012-01-01

200

Vnodes: An Architecture for Multiple File System Types in Sun UNIX  

Microsoft Academic Search

This paper describes an architecture for accommodating multiple file system implementations within theSun UNIX+ kernel. The file system implementations can encompass local, remote, or even non-UNIX filesystems. These file systems can be "plugged" into the kernel through a well defined interface, much thesame way as UNIX device drivers are currently added to the kernel.

Steve R. Kleiman

1986-01-01

201

Detecting Data Concealment Programs Using Passive File System Analysis  

NASA Astrophysics Data System (ADS)

Individuals who wish to avoid leaving evidence on computers and networks often use programs that conceal data from conventional digital forensic tools. This paper discusses the application of passive file system analysis techniques to detect trace evidence left by data concealment programs. In addition, it describes the design and operation of Seraph, a tool that determines whether certain encryption, steganography and erasing programs were used to hide or destroy data.

Davis, Mark; Kennedy, Richard; Pyles, Kristina; Strickler, Amanda; Shenoi, Sujeet

202

ASDF: An Autonomous and Scalable Distributed File System  

Microsoft Academic Search

The demand for huge storage space on data-intensive applications and high-performance scientific computing continues to grow. To integrate massive distributed storage resources for providing huge storage space is an important and challenging issue in Cloud and Grid computing. In this paper, we propose a distributed file system, called ASDF, to meet the demands of not only data-intensive applications but also

Chien-Ming Wang; Chi-Chang Huang; Huan-Ming Liang

2011-01-01

203

TidyFS: A Simple and Small Distributed File System  

Microsoft Academic Search

This paper describes TidyFS, a simple and small distributed file system that provides the abstractions necessary for data parallel computations on clusters. In recent years there has been an explosion of interest in computing using clusters of commodity, shared nothing computers. Frequently the primary I\\/O workload for such clusters is generated by a distributed execution engine such as MapReduce, Hadoop

Dennis Fetterly; Maya Haridasan; Michael Isard; Swaminathan Sundararaman

2011-01-01

204

PLFS and HDFS: Enabling Parallel Filesystem Semantics In The Cloud Hadoop Distributed File System  

E-print Network

PLFS and HDFS: Enabling Parallel Filesystem Semantics In The Cloud SVD10 Hadoop Distributed File parallel file system. Contains a sub-directory per host, each containing an index file and a data log per System Milo Polte1, Esteban Molina-Estolan2, John Bent3, Garth Gibson1, Carlos Maltzahn2, Maya B. Gokhale

Maltzahn, Carlos

205

TABLEFS: Embedding a NoSQL Database Inside the Local File System  

E-print Network

TABLEFS: Embedding a NoSQL Database Inside the Local File System Kai Ren, Garth Gibson CMU-PDL-12 by metadata and tiny files. Acknowledgements: This research is supported in part by The Gordon and Betty Moore

206

The design and implementation of a log-structured file system  

Microsoft Academic Search

This paper presents a new technique for disk storage management called a log-structured file system. A log-structured file system writes all modifications to disk sequentially in a log-like structure, thereby speeding up both file writing and crash recovery. The log is the only structure on disk; it contains indexing information so that files can be read back from the log

Mendel Rosenblum; John K. Ousterhout

1992-01-01

207

Streaming RAID: a disk array management system for video files  

Microsoft Academic Search

The characteristics of digital video files and traffic differ substantially from those encountered with data applications: (i) video files are much larger than data files, and (ii) video traffic is continuous in nature while data traffic is bursty, with the data rate of a video stream much higher than the mean rate of a data traffic source. Accordingly, conventional file

Fouad A. Tobagi; Joseph Pang; Randall Baird; Mark Gang

1993-01-01

208

26 CFR 301.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false Required use of magnetic media for returns by organizations required...301.6033-4 Required use of magnetic media for returns by organizations required...file returns under section 6033 on magnetic media. An organization required to file a...

2012-04-01

209

26 CFR 301.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Required use of magnetic media for returns by organizations required...301.6033-4 Required use of magnetic media for returns by organizations required...file returns under section 6033 on magnetic media. An organization required to file a...

2013-04-01

210

26 CFR 301.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

...2014-04-01 false Required use of magnetic media for returns by organizations required...301.6033-4 Required use of magnetic media for returns by organizations required...file returns under section 6033 on magnetic media. An organization required to file a...

2014-04-01

211

DEVELOPMENT OF THE NATIONAL ACID PRECIPITATION ASSESSMENT PROGRAM (NAPAP) EMISSIONS INVENTORY, 1980: THE FLEXIBLE REGIONAL EMISSIONS DATA SYSTEM (SOFTWARE, ALLOCATION FACTOR FILES, PERIPHERAL DATA FILES)  

EPA Science Inventory

The package contains documentation of the Flexible Regional Emissions Data System (FREDS) for the 1980 NAPAP Emissions Inventory, FREDS source code, allocation factor files, and peripheral data files. FREDS extracts emissions data, pertinent modeling parameters (e.g., stack heigh...

212

20 CFR 410.219 - Filing a claim under State workmen's compensation law; when filing such claim shall be considered...  

Code of Federal Regulations, 2011 CFR

... Employees' Benefits SOCIAL SECURITY ADMINISTRATION FEDERAL COAL MINE HEALTH AND SAFETY ACT OF 1969, TITLE IV-BLACK LUNG BENEFITS (1969- ) Requirements for Entitlement; Duration of Entitlement; Filing of Claims and Evidence §...

2011-04-01

213

AliEnFS - a Linux File System for the AliEn Grid Services  

Microsoft Academic Search

Among the services offered by the AliEn (ALICE Environment\\u000ahttp:\\/\\/alien.cern.ch) Grid framework there is a virtual file catalogue to allow\\u000atransparent access to distributed data-sets using various file transfer\\u000aprotocols. $alienfs$ (AliEn File System) integrates the AliEn file catalogue as\\u000aa new file system type into the Linux kernel using LUFS, a hybrid user space\\u000afile system framework (Open Source

Andreas-J. Peters; Pablo Saiz; Predrag Buncic

2003-01-01

214

ATLAS, an integrated structural analysis and design system. Volume 4: Random access file catalog  

NASA Technical Reports Server (NTRS)

A complete catalog is presented for the random access files used by the ATLAS integrated structural analysis and design system. ATLAS consists of several technical computation modules which output data matrices to corresponding random access file. A description of the matrices written on these files is contained herein.

Gray, F. P., Jr. (editor)

1979-01-01

215

Analysis and Evolution of Journaling File Systems Vijayan Prabhakaran, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau  

E-print Network

NTFS; in the process, we uncover many strengths and weaknesses of these journaling file systems. We for various file system operations, one can elicit some salient aspects of file system performance [6, 8, 19 the file system, but focus our analysis not only on the time taken for said operations, but also

Arpaci-Dusseau, Andrea

216

26 CFR 1.6033-6 - Notification requirement for entities not required to file an annual information return under...  

Code of Federal Regulations, 2010 CFR

...entities not required to file an annual information return under section 6033(a)(1) (taxable years beginning after December 31, 2006). 1.6033-6 Section 1.6033-6 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE...

2010-04-01

217

Human factors challenges in creating a principal support office system—the speech filing system approach  

Microsoft Academic Search

This paper identifies the key behavioral challenges in designing a principal-support office system and our approaches to them. These challenges included designing a system which office principals would find useful and would directly use themselves. Ultimately, the system, called the Speech Filing System (SFS), became primarily a voice store and forward message system with which users compose, edit, send, and

John D. Gould; Stephen J. Boies

1983-01-01

218

INTEGRATION OF ADAPTIVE FILE ASSIGNMENT INTO DISTRIBUTED SAFETY-CRITICAL SYSTEMS  

E-print Network

INTEGRATION OF ADAPTIVE FILE ASSIGNMENT INTO DISTRIBUTED SAFETY-CRITICAL SYSTEMS Horst F. Wedde : Safety-critical systems typically operate in unpredictable environments. Requirements for safety are reported. Keywords : Distributed Real-Time Systems, Operating Systems, Distributed File Systems, Safety-Critical

Wedde, Horst F.

219

The joys of complexity and the deleted file  

Microsoft Academic Search

This article considers the improved quality of evidence which may be extracted from computers running under modern operating systems and file systems. By way of illustration the author discusses the treatment of deleted files under legacy DOS systems, Windows 9x systems and the NTFS file system, and illustrates the various data artefacts associated with each. It is clear that, although

Geoff H. Fellows

2005-01-01

220

Sun's Network File System (NFS) One of the first uses of distributed client/server computing was  

E-print Network

34 Sun's Network File System (NFS) One of the first uses of distributed client/server computing of data across clients. Thus, if 1 #12;2 SUN'S NETWORK FILE SYSTEM (NFS) you access a file on one machine-DUSSEAU #12;SUN'S NETWORK FILE SYSTEM (NFS) 3 even; in the best such case, no network traffic need be gener

Sheridan, Jennifer

221

Silberschatz, Galvin and Gagne 2009Operating System Concepts 8th Edition, Lecture 23: Distributed-File  

E-print Network

Silberschatz, Galvin and Gagne ©2009Operating System Concepts ­ 8th Edition, Lecture 23: Distributed-File Systems (Chapter 17) #12;17.2 Silberschatz, Galvin and Gagne ©2009Operating System Concepts.e., not distinguish between local and remote files #12;17.3 Silberschatz, Galvin and Gagne ©2009Operating System

Iamnitchi, Adriana

222

Self-Similarity in File Systems Steven D. Gribble, Gurmeet Singh Manku, Drew Roselli, and Eric A. Brewer  

E-print Network

Self-Similarity in File Systems Steven D. Gribble, Gurmeet Singh Manku, Drew Roselli, and Eric A events exhibit self- similar behaviour, but only for short-term time scales of approxi- mately under are shown to have self-similar like behaviour, with consistent Hurst parameters a measure of self

Miller, Ethan L.

223

GPUfs: Integrating a File System with GPUs MARK SILBERSTEIN, University of Texas at Austin  

E-print Network

1 GPUfs: Integrating a File System with GPUs MARK SILBERSTEIN, University of Texas at Austin BRYAN, operating systems design, GPGPUs, file systems ACM Reference Format: Mark Silberstein, Bryan Ford, Idit to their impressive price/performance and performance/watt curves, GPUs have become the processor of choice for many

Witchel, Emmett

224

Enabling large-scale storage in sensor networks with the Coffee file system  

Microsoft Academic Search

Persistent storage offers multiple advantages for sensor networks, yet the available storage systems have been unwieldy because of their complexity and device-specific designs. We present the Coffee file system for flash- based sensor devices. Coffee provides a programming interface for building efficient and portable storage ab- stractions. Unlike previous flash file systems, Coffee uses a small and constant RAM footprint

Nicolas Tsiftes; Adam Dunkels; Zhitao He; Thiemo Voigt

2009-01-01

225

THE IMPLEMENTATION OF A DISTRIBUTED FILE SYSTEM SUPPORTING THE PARALLEL WORLD MODEL  

E-print Network

THE IMPLEMENTATION OF A DISTRIBUTED FILE SYSTEM SUPPORTING THE PARALLEL WORLD MODEL Jun Sun and processes, we are implementing an operating system supporting the parallel world model. The parallel world world. Files in the child world are also deleted. A large software package, such as a window system

Shinjo, Yasushi

226

Enhancing the Scalability of Blue Whale Cluster File System in Video-editing Environment  

Microsoft Academic Search

Scalability, which indicates the capacity of system to support the maximal number of clients, is very important to cluster file system. But in practical applications, the bandwidth that storage devices provide doesnpsilat linearly grow with the increasing number of clients which leads to bad QoS and restricts the scalability of cluster file system. This paper analyses the bottleneck of scalability

Chengxiang Si; Xiaoxuan Meng; Junwei Zhang; Lu Xu

2009-01-01

227

Measurement and Analysis of Large-Scale Network File System Workloads  

Microsoft Academic Search

In this paper we present the analysis of two large-scale network file system workloads. We measured CIFS traf- fic for two enterprise-class file servers deployed in the NetApp data center for a three month period. One file server was used by marketing, sales, and finance de- partments and the other by the engineering department. Together these systems represent over 22TB

Andrew W. Leung; Shankar Pasupathy; Garth R. Goodson; Ethan L. Miller

2008-01-01

228

37 CFR 201.34 - Procedures for filing Correction Notices of Intent to Enforce a Copyright Restored under the...  

Code of Federal Regulations, 2011 CFR

...and Copyrights COPYRIGHT OFFICE, LIBRARY OF CONGRESS COPYRIGHT OFFICE AND PROCEDURES...History Documents (COHD) file through the Library of Congress electronic information system...terminals located in other parts of the Library of Congress through the Library of...

2011-07-01

229

37 CFR 201.34 - Procedures for filing Correction Notices of Intent to Enforce a Copyright Restored under the...  

Code of Federal Regulations, 2013 CFR

...and Copyrights COPYRIGHT OFFICE, LIBRARY OF CONGRESS COPYRIGHT OFFICE AND PROCEDURES...History Documents (COHD) file through the Library of Congress electronic information system...terminals located in other parts of the Library of Congress through the Library of...

2013-07-01

230

37 CFR 201.34 - Procedures for filing Correction Notices of Intent to Enforce a Copyright Restored under the...  

Code of Federal Regulations, 2012 CFR

...and Copyrights COPYRIGHT OFFICE, LIBRARY OF CONGRESS COPYRIGHT OFFICE AND PROCEDURES...History Documents (COHD) file through the Library of Congress electronic information system...terminals located in other parts of the Library of Congress through the Library of...

2012-07-01

231

34 CFR 222.154 - How must written submissions under this subpart be filed?  

Code of Federal Regulations, 2011 CFR

...be filed by hand-delivery, mail, or facsimile transmission. The Secretary discourages the use of facsimile transmission for documents longer than...document upon the other party or parties by facsimile transmission. (c) The filing...

2011-07-01

232

34 CFR 222.154 - How must written submissions under this subpart be filed?  

Code of Federal Regulations, 2010 CFR

...be filed by hand-delivery, mail, or facsimile transmission. The Secretary discourages the use of facsimile transmission for documents longer than...document upon the other party or parties by facsimile transmission. (c) The filing...

2010-07-01

233

75 FR 61464 - Acadian Gas Pipeline System; Notice of Compliance Filing  

Federal Register 2010, 2011, 2012, 2013

...No. PR10-115-000] Acadian Gas Pipeline System; Notice of Compliance Filing...on September 22, 2010, Acadian Gas Pipeline System, in compliance with the...1\\ See Acadian Gas Pipeline System, Docket Nos....

2010-10-05

234

GPUfs: Integrating a File System with GPUs MARK SILBERSTEIN, University of Texas at Austin  

E-print Network

1 GPUfs: Integrating a File System with GPUs MARK SILBERSTEIN, University of Texas at Austin BRYAN Design, GPGPUs, File Systems, accelerators ACM Reference Format: Mark Silberstein, Bryan Ford, Idit Due to their impressive price/performance and performance/watt curves, GPUs have be- come

Keidar, Idit

235

ELF: an efficient log-structured flash file system for micro sensor nodes  

Microsoft Academic Search

An efficient and reliable file storage system is important to micro sensor nodes so that data can be logged for later asynchronous delivery across a multi-hop wireless sensor network. Designing and implementing such a file system for a sensor node faces various challenges. Sensor nodes are highly resource constrained in terms of limited runtime memory, limited persistent storage, and finite

Hui Dai; Michael Neufeld; Richard Han

2004-01-01

236

The Design and Implementation of a Log-Structured File System  

Microsoft Academic Search

This paper presents a new technique for disk storage management called a to compress the live information from heavily fragmented segments. We present a series of simulations that demonstrate the efficiency of a simple cleaning policy based on cost and benefit. We have implemented a prototype log-structured file system called Sprite LFS; it outperforms current Unix file systems by an

Mendel Rosenblum; John K. Ousterhout

1991-01-01

237

Towards A Grid File System Based On A Large-Scale BLOB Management Service  

Microsoft Academic Search

This paper addresses the problem of building a grid file system for appli- cations that need to manipulate huge data, distributed and concurrently accessed at a very large scale. In this paper we explore how this goal could be reached through a cooperation between the Gfarm grid file sys- tem and BlobSeer, a distributed object management system specifically designed for

Viet-Trung Tran; Gabriel Antoniu; Bogdan Nicolae; Luc Bougé; Osamu Tatebe

2009-01-01

238

Clustered-File Management with Account Control System Utilizing Remote Storage Service Using Open Source Technology  

Microsoft Academic Search

Technological advancements provide greater opportunity to strengthen software development. Handling clustered-file in client-server architecture typically provides more stable and secures storage feature and mounting. Unsecured storage space results to unwanted events such as permanent deletion of files and plagiarism. With a clustered-file management system this problem is largely eliminated, allowing very large numbers of data to be clustered together; this

M. G. C. E. Sicat; J. M. Flor; M. A. T. Subion; A. A. Hernandez

2009-01-01

239

A Lowbandwidth Network File System Athicha Muthitacharoen, Benjie Chen, and David Mazi  

E-print Network

file access would often be desirable over such networks---particularly when high latency makes remote to work over networks slower than LANs. Even with broadband Internet access, a person working from home. In the absence of a network file system, people generally resort to one of two methods of accessing remote data

Mazières, David

240

A Low-bandwidth Network File System Athicha Muthitacharoen, Benjie Chen, and David Mazi`eres  

E-print Network

file access would often be desirable over such networks--particularly when high latency makes remote to work over networks slower than LANs. Even with broadband Internet access, a person working from home. In the absence of a network file system, people generally resort to one of two methods of accessing remote data

241

Multilevel Caching in Distributed File Systems Your cache ain't nuthin' but trash  

E-print Network

to address scaling problems in increasingly large distributed file systems. To this end, we have run trace server. This turns out to be quite low in the traces available to us. All told, fewer than 10% of block tools and techniques for offering file service to a huge client base, perhaps as many as 30,000 end

Honeyman, Peter

242

Speculative Execution in a Distributed File System Edmund B. Nightingale, Peter M. Chen, and Jason Flinn  

E-print Network

Flinn Department of Electrical Engineering and Computer Science University of Michigan ABSTRACT the consistency of single­copy file semantics and the safety of synchronous I/O, yet still outperform current distributed file systems with weaker con­ sistency and safety. General Terms Performance, Design Categories

Flinn, Jason

243

Speculative Execution in a Distributed File System Edmund B. Nightingale, Peter M. Chen, and Jason Flinn  

E-print Network

Flinn Department of Electrical Engineering and Computer Science University of Michigan ABSTRACT the consistency of single-copy file semantics and the safety of synchronous I/O, yet still outperform current distributed file systems with weaker con- sistency and safety. General Terms Performance, Design Categories

California at Irvine, University of

244

Rigel: A Scalable and Lightweight Replica Selection Service for Replicated Distributed File System  

Microsoft Academic Search

Replicated distributed file systems are designed to store large file reliably across lots of machines, and it arouse the problem of selecting the nearest replica for clients. In this paper, we propose Rigel, a Network Coordinates (NC) based nearest replica selection service, which is an effective infrastructure to select the nearest replica for client in a scalable and lightweight way.

Yuan Lin; Yang Chen; Guodong Wang; Beixing Deng

2010-01-01

245

The Umbrella File System: Storage Management Across Heterogeneous Devices  

E-print Network

With the advent of Flash based solid state devices (SSDs), the differences in physical devices used to store data in computers are becoming more and more pronounced. Effectively mapping the differences in storage devices to the files...

Garrison, John Allen

2011-08-08

246

A Quantitative Analysis of Cache Policies for Scalable Network File Systems Michael D. Dahlin, Clifford J. Mather, Randolph Y. Wang,  

E-print Network

1 A Quantitative Analysis of Cache Policies for Scalable Network File Systems Michael D. Dahlin. more than commodity workstations, even for the server. In reality, the widely used SUN Network File-performance multiprocessor systems needed to scale NFS to more than a few dozen clients. The Andrew File System, AFS [Howa88

Dahlin, Michael D.

247

NASA Uniform Files Index  

NASA Technical Reports Server (NTRS)

This handbook is a guide for the use of all personnel engaged in handling NASA files. It is issued in accordance with the regulations of the National Archives and Records Administration, in the Code of Federal Regulations Title 36, Part 1224, Files Management; and the Federal Information Resources Management Regulation, Subpart 201-45.108, Files Management. It is intended to provide a standardized classification and filing scheme to achieve maximum uniformity and ease in maintaining and using agency records. It is a framework for consistent organization of information in an arrangement that will be useful to current and future researchers. The NASA Uniform Files Index coding structure is composed of the subject classification table used for NASA management directives and the subject groups in the NASA scientific and technical information system. It is designed to correlate files throughout NASA and it is anticipated that it may be useful with automated filing systems. It is expected that in the conversion of current files to this arrangement it will be necessary to add tertiary subjects and make further subdivisions under the existing categories. Established primary and secondary subject categories may not be changed arbitrarily. Proposals for additional subject categories of NASA-wide applicability, and suggestions for improvement in this handbook, should be addressed to the Records Program Manager at the pertinent installation who will forward it to the NASA Records Management Office, Code NTR, for approval. This handbook is issued in loose-leaf form and will be revised by page changes.

1987-01-01

248

26 CFR 1.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

...2014-04-01 false Required use of magnetic media for returns by organizations required...1.6033-4 Required use of magnetic media for returns by organizations required...that is required to be filed on magnetic media under § 301.6033-4 of this...

2014-04-01

249

26 CFR 1.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false Required use of magnetic media for returns by organizations required...1.6033-4 Required use of magnetic media for returns by organizations required...that is required to be filed on magnetic media under § 301.6033-4 of this...

2012-04-01

250

26 CFR 1.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Required use of magnetic media for returns by organizations required...1.6033-4 Required use of magnetic media for returns by organizations required...that is required to be filed on magnetic media under § 301.6033-4 of this...

2013-04-01

251

Comparison of Canal Transportation and Centering Ability of Twisted Files, Pathfile-ProTaper System, and Stainless Steel Hand K-Files by Using Computed Tomography  

Microsoft Academic Search

IntroductionThe purpose of this study was to compare canal transportation and centering ability of 2 rotary nickel-titanium (NiTi) systems (Twisted Files [TF] and Pathfile-ProTaper [PP]) with conventional stainless steel K-files.

Richard Gergi; Joe Abou Rjeily; Joseph Sader; Alfred Naaman

2010-01-01

252

A resources monitoring architecture for P2P file-sharing systems  

NASA Astrophysics Data System (ADS)

Resources monitoring is an important problem of the overall efficient usage and control of P2P file-sharing systems. The resources of file-sharing systems can include all distributing servers, programs and peers. Several researches have tried to address this issue, but most of them illuminated P2P traffic characterization, identification and user behavior. Based on previous work, we present a resources monitoring architecture for P2P file-sharing systems. The monitoring architecture employs a hierarchical structure and provides systemic monitoring including resources discovery, relative information extraction and analysis, trace and location. It gives a systematic framework for file-sharing resources monitoring. And a prototype system has been developed based on the framework.

Wang, Wenxian; Chen, Xingshu; Wang, Haizhou

2013-07-01

253

Single file and normal dual mode diffusion in highly confined hard sphere mixtures under flow.  

PubMed

We use Monte Carlo simulations to study the dual-mode diffusion regime of binary and tertiary mixtures of hard spheres confined in narrow cylindrical pores under the influence of an imposed flow. The flow is introduced to the dynamics by adding a small bias directed along the long axis of the pore to the random displacement of each Monte Carlo move. As a result, the motion of the particles in all the components is dominated by a drift velocity that causes the mean squared displacements to increase quadratically in the long time limit. However, an analysis of the mean squared displacements at intermediate time scales shows that components of the mixture above and below their passing thresholds still exhibit behaviors consistent with normal and single-file diffusion, respectively. The difference between the mean squared displacements of the various components is shown to go though a maximum, suggesting there may be an optimal pore diameter for the separation of mixtures exhibiting dual-mode diffusion. PMID:22979868

Wanasundara, Surajith N; Spiteri, Raymond J; Bowles, Richard K

2012-09-14

254

Error Propagation Analysis for File Systems # Cindy RubioGonzlez Haryadi S. Gunawi Ben Liblit  

E-print Network

(ext4), and shared virtual file system (VFS) code uncovers 312 error propa­ gation bugs. Our flow­dependent user applications. Furthermore, this problem cannot simply be fixed and forgotten. Implementations

Liblit, Ben

255

Error Propagation Analysis for File Systems Cindy Rubio-Gonzlez Haryadi S. Gunawi Ben Liblit  

E-print Network

(ext4), and shared virtual file system (VFS) code uncovers 312 error propa- gation bugs. Our flow-dependent user applications. Furthermore, this problem cannot simply be fixed and forgotten. Implementations

Liblit, Ben

256

A reputation system for BitTorrent peer-to-peer file-sharing networks  

Microsoft Academic Search

Over the past few years, Peer-to-Peer (P2P) networks have grown extensively and dramatically changed large-scale file transfer. One of the most popular P2P network is the BitTorrent system. BitTorrent can efficiently distribute large files by optimizing the use of network bandwidth and providing scalability. Due to the open and anonymous nature of P2P systems BitTorrent also provides an ideal environment

Lan Yu

2006-01-01

257

The Fifth Workshop on HPC Best Practices: File Systems and Archives  

SciTech Connect

The workshop on High Performance Computing (HPC) Best Practices on File Systems and Archives was the fifth in a series sponsored jointly by the Department Of Energy (DOE) Office of Science and DOE National Nuclear Security Administration. The workshop gathered technical and management experts for operations of HPC file systems and archives from around the world. Attendees identified and discussed best practices in use at their facilities, and documented findings for the DOE and HPC community in this report.

Hick, Jason; Hules, John; Uselton, Andrew

2011-11-30

258

Research of the file system of volume holographic storage based on virtual storage layer  

Microsoft Academic Search

Volume holographic storage (VHS) is currently the subject of widespread interest as a fast-readout-rate, high-capacity digital data-storage technology. To make need of characteristics of the VHS, the paper present the file system using a virtual storage layer (VSL) which can be compatible with the logic layer of the current used file system and accommodate the requirement of VHS in the

Fei Wu; Faling Yi; Changsheng Xie

2008-01-01

259

Hades: Locality-aware Proxy Caching for Distributed File Systems  

Microsoft Academic Search

In the present paper we explore storage manage- ment issues in proxy servers for distributed file sys- tems. We organize the requested data at the disks of the proxy server using locality-aware approaches. Ad- ditionally, we introduce improvements in the map- ping mechanism from remote to local data and con- sider cost-aware replacement methods. In a prototype implementation that we

Lamprini Konsta; Stergios V. Anastasiadis

2009-01-01

260

Lessons Learned in Deploying the World s Largest Scale Lustre File System  

SciTech Connect

The Spider system at the Oak Ridge National Laboratory's Leadership Computing Facility (OLCF) is the world's largest scale Lustre parallel file system. Envisioned as a shared parallel file system capable of delivering both the bandwidth and capacity requirements of the OLCF's diverse computational environment, the project had a number of ambitious goals. To support the workloads of the OLCF's diverse computational platforms, the aggregate performance and storage capacity of Spider exceed that of our previously deployed systems by a factor of 6x - 240 GB/sec, and 17x - 10 Petabytes, respectively. Furthermore, Spider supports over 26,000 clients concurrently accessing the file system, which exceeds our previously deployed systems by nearly 4x. In addition to these scalability challenges, moving to a center-wide shared file system required dramatically improved resiliency and fault-tolerance mechanisms. This paper details our efforts in designing, deploying, and operating Spider. Through a phased approach of research and development, prototyping, deployment, and transition to operations, this work has resulted in a number of insights into large-scale parallel file system architectures, from both the design and the operational perspectives. We present in this paper our solutions to issues such as network congestion, performance baselining and evaluation, file system journaling overheads, and high availability in a system with tens of thousands of components. We also discuss areas of continued challenges, such as stressed metadata performance and the need for file system quality of service alongside with our efforts to address them. Finally, operational aspects of managing a system of this scale are discussed along with real-world data and observations.

Dillow, David A [ORNL; Fuller, Douglas [ORNL; Wang, Feiyi [ORNL; Oral, H Sarp [ORNL; Zhang, Zhe [ORNL; Hill, Jason J [ORNL; Shipman, Galen M [ORNL

2010-01-01

261

78 FR 70961 - Notice of Filing of Proposed Settlement Agreement Under the Comprehensive Environmental Response...  

Federal Register 2010, 2011, 2012, 2013

...Environmental Services, LLC (``PACES'') and CES Environmental Services, Inc. (``CES'') filed a proposed Settlement Agreement with...District of Texas in the matters entitled In re: CES Environmental Services, Inc., Case No....

2013-11-27

262

A Reliable Non-volatile Memory System: Exploiting File-System Characteristics  

Microsoft Academic Search

Flash memory has become a popular non-volatile memory technology and is widely used in mobile electronics devices and consumer applications. A flash-memory device is different from typical hard-disk devices and requires sophisticated management to improve the lifetime and the performance. As a result, when a file system is executed on these flash-memory devices, the endurance problem will be an important

Chin-hsien Wu; Wen-yen Chang; Zen-wei Hong

2009-01-01

263

Operating System Concepts with Java 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne 2007 Chapter 10: File-System Interface  

E-print Network

Operating System Concepts with Java ­ 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne ©2007 Chapter 10: File-System Interface #12;10.2 Silberschatz, Galvin and Gagne ©2007Operating System Methods Directory Structure File-System Mounting File Sharing Protection #12;10.3 Silberschatz, Galvin

Bezrukov, Sergei

264

One Big File Is Not Enough: A Critical Evaluation of the Dominant Free-Space  

E-print Network

is to change operating systems so that files are actually overwrit- ten when they are unlinked. A second" using sector- by-sector disk imaging on file systems running under Windows, Mac OS, Linux, and FreeBSD. We find the big file is effective in overwriting file data on FAT32, NTFS, and HFS, but not on Ext2fs

Malan, David J.

265

Research of the file system of volume holographic storage based on virtual storage layer  

NASA Astrophysics Data System (ADS)

Volume holographic storage (VHS) is currently the subject of widespread interest as a fast-readout-rate, high-capacity digital data-storage technology. To make need of characteristics of the VHS, the paper present the file system using a virtual storage layer (VSL) which can be compatible with the logic layer of the current used file system and accommodate the requirement of VHS in the physical layer. The VSL which is made of the super block, directory area, the metadata area and dynamic file area can connect directly to the storage media one side and implement compatible to the existing file system by providing the operating interfaces for the above logical file system. We produce the two layer storage structure which effectively reduces the number of disk accessed and improves the speed of file read and write. The allocation mode of 'hybrid of block and zone' and allocation strategy of 'block priority' greatly improve the space utilization rate of storage device and enforce the storage adaptability in VHS.

Wu, Fei; Yi, Faling; Xie, Changsheng

2008-02-01

266

Active transport in dense diffusive single-file systems.  

PubMed

We study a minimal model of active transport in crowded single-file environments which generalizes the emblematic model of single-file diffusion to the case when the tracer particle (TP) performs either an autonomous directed motion or is biased by an external force, while all other particles of the environment (bath) perform unbiased diffusions. We derive explicit expressions, valid in the limit of high density of bath particles, of the full distribution P((n))(X) of the TP position and of all its cumulants, for arbitrary values of the bias f and for any time n. Our analysis reveals striking features, such as the anomalous scaling [proportionality] ?[n] of all cumulants, the equality of cumulants of the same parity characteristic of a Skellam distribution and a convergence to a Gaussian distribution in spite of asymmetric density profiles of bath particles. Altogether, our results provide the full statistics of the TP position and set the basis for a refined analysis of real trajectories of active particles in crowded single-file environments. PMID:23909364

Illien, P; Bénichou, O; Mejía-Monasterio, C; Oshanin, G; Voituriez, R

2013-07-19

267

Replication, History, and Grafting in the Ori File System Ali Jose Mashtizadeh, Andrea Bittau, Yifeng Frank Huang, David Mazi`eres  

E-print Network

; as a network file system, Ori over a WAN outperforms NFS over a LAN. 1 Introduction The file system abstractionReplication, History, and Grafting in the Ori File System Ali Jos�e Mashtizadeh, Andrea Bittau, Yifeng Frank Huang, David Mazi`eres Stanford University Abstract Ori is a file system that manages user

Mazières, David

268

Implementation of a computerized nuclear cardiology database on the Veterans Administration FileMan system  

Microsoft Academic Search

The rapidly increasing volume of invasive and noninvasive cardiovascular procedures, complicated by inherent delays in the reporting and archiving of data, led to the development of the File-Man-based Nuclear Cardiology Database (NCD). FileMan is a hierarchical-relational database system, written in standard Mumps, which has been implemented for a variety of uses at several Veterans Administration sites. It uses open architecture

F. C. Robinson; D. W. Lum; A. Beyoglu; A. J. Robinson-White; J. J. Smith; R. D. Fletcher

1988-01-01

269

Multilevel Caching in Distributed File Systems — or — Your cache ain't nuthin' but trash  

Microsoft Academic Search

We are investigating the potential for a hierarchy of intermediate file servers to address scaling problems in increasingly large distributed file systems. To this end, we have run trace-driven simulations based on data from DEC-SRC and our own data collection to determine the potential of caching-only intermediate servers. The degree of sharing among clients is central to the effectiveness of

D. Muntz; P. Honeyman

1992-01-01

270

The global unified parallel file system (GUPFS) project: FY 2002 activities and results  

SciTech Connect

The Global Unified Parallel File System (GUPFS) project is a multiple-phase, five-year project at the National Energy Research Scientific Computing (NERSC) Center to provide a scalable, high performance, high bandwidth, shared file system for all the NERSC production computing and support systems. The primary purpose of the GUPFS project is to make it easier to conduct advanced scientific research using the NERSC systems. This is to be accomplished through the use of a shared file system providing a unified file namespace, operating on consolidated shared storage that is directly accessed by all the NERSC production computing and support systems. During its first year, FY 2002, the GUPFS project focused on identifying, testing, and evaluating existing and emerging shared/cluster file system, SAN fabric, and storage technologies; identifying NERSC user input/output (I/O) requirements, methods, and mechanisms; and developing appropriate benchmarking methodologies and benchmark codes for a parallel environment. This report presents the activities and progress of the GUPFS project during its first year, the results of the evaluations conducted, and plans for near-term and longer-term investigations.

Butler, Gregory F.; Lee, Rei Chi; Welcome, Michael L.

2003-04-07

271

Reliability mechanisms for file systems using non-volatile memory as a metadata store  

Microsoft Academic Search

Portable systems such as cell phones and portable media players commonly use non-volatile RAM (NVRAM) to hold all of their data and metadata, and larger systems can store metadata in NVRAM to increase file system performance by reducing synchronization and transfer overhead between disk and memory data structures. Unfortunately, wayward writes from buggy software and random bit flips may result

Kevin M. Greenan; Ethan L. Miller

2006-01-01

272

Towards Realistic File-System Benchmarks with CodeMRI Nitin Agrawal, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau  

E-print Network

. This is insuffi- cient since even a simple operation through the API may end up exercising the file system in very storage sys- tem [10] to local file systems such as NTFS [26] and Linux ext3 [32]. Unfortunately, fileTowards Realistic File-System Benchmarks with CodeMRI Nitin Agrawal, Andrea C. Arpaci

Arpaci-Dusseau, Andrea

273

Los Alamos National Laboratory Associate Directorate for Theory, Simulation, and Computation (ADTSC) LA-UR 13-2083982 Parallel Log Structured File System (PLFS)  

E-print Network

) LA-UR 13-2083982 Parallel Log Structured File System (PLFS) Gary Grider, HPC-DO; John Bent, EMC applications at LANL, we developed the Parallel Log Structured File System (PLFS)[1]. PLFS is a transformative generation of parallel file systems. Despite severe bandwidth limitations, single shared file checkpointing

274

NADIR: A prototype system for detecting network and file system abuse  

SciTech Connect

This paper describes the design of a prototype computer misuse detection system for the Los Alamos Notional Laboratory's Integrated Computing Network (ICN). This automated expert system, the Network Anomaly Detection and Intrusion Reporter (NADIR), streamlines and supplements the manual audit record review traditionally performed by security auditors. NADIR compares network activity, as summarized in weekly profiles of individual users and the ICN as a whole, against expert rules that define security policy, improper or suspicious behavior, and normal user activity. NADIR reports suspicious behavior to security auditors and provides tools to aid in follow-up investigations. This paper describes analysis by NADIR of two types of ICN activity: user authentication and access control, and mass file storage. It highlights system design issues of data handling, exploiting existing auditing systems, and performing audit analysis at the network level.

Hochberg, J.G.; Jackson, K.A.; Stallings, C.A.; McClary, J.F.; DuBois, D.H.; Ford, J.R.

1992-01-01

275

NADIR: A prototype system for detecting network and file system abuse  

SciTech Connect

This paper describes the design of a prototype computer misuse detection system for the Los Alamos Notional Laboratory`s Integrated Computing Network (ICN). This automated expert system, the Network Anomaly Detection and Intrusion Reporter (NADIR), streamlines and supplements the manual audit record review traditionally performed by security auditors. NADIR compares network activity, as summarized in weekly profiles of individual users and the ICN as a whole, against expert rules that define security policy, improper or suspicious behavior, and normal user activity. NADIR reports suspicious behavior to security auditors and provides tools to aid in follow-up investigations. This paper describes analysis by NADIR of two types of ICN activity: user authentication and access control, and mass file storage. It highlights system design issues of data handling, exploiting existing auditing systems, and performing audit analysis at the network level.

Hochberg, J.G.; Jackson, K.A.; Stallings, C.A.; McClary, J.F.; DuBois, D.H.; Ford, J.R.

1992-10-01

276

Applying Informetric Characteristics of Databases to IR System File Design, Part I: Informetric Models.  

ERIC Educational Resources Information Center

Examines how informetric characteristics of information retrieval (IR) system databases can be used to help system designers decide what type of file structures would provide the best performance. The development of appropriate models describing database contents is highlighted in this first part of a two-part study. (30 references) (LRW)

Wolfram, Dietmar

1992-01-01

277

Eliciting Motivation Knowledge from Log Files towards Motivation Diagnosis for Adaptive Systems  

E-print Network

. Keywords: e-Learning, motivation, log files analysis, data mining, adaptive systems, user modeling 1 Introduction Although motivation is a key component of learning, the main focus in adaptive educational systems discusses previous work related to motivation in e-Learning; it includes a description of our approach

Cocea, Mihaela

278

THE IMPLEMENTATION OF A DISTRIBUTED FILE SYSTEM SUPPORTING THE PARALLEL WORLD MODEL  

E-print Network

THE IMPLEMENTATION OF A DISTRIBUTED FILE SYSTEM SUPPORTING THE PARALLEL WORLD MODEL Jun Sun and processes, we are implementing an operating system supporting the parallel world model. The parallel world Tsukuba, Ibaraki, 305-8573, Japan Email: jun sun@hlla.is.tsukuba.ac.jp ABSTRACT The parallel world model

Shinjo, Yasushi

279

Dynamic I\\/O Reconfiguration for a NFS-Based Parallel File System  

Microsoft Academic Search

The large gap between the speed in which data can be processed and the performance of I\\/O devices makes the shared storage infrastructure of a cluster a great bottle- neck. Parallel File Systems try to smooth such difference by distributing data onto several servers, increasing the system's available bandwidth. However, most implementations use a fixed number of I\\/O servers, defined

Rodrigo Kassick; Francieli Zanon Boito; Philippe Olivier Alexandre Navaux

2011-01-01

280

Archipelago: An Island-Based File System For Highly Available And Scalable Internet Services  

Microsoft Academic Search

Maintaining availability in the face of failures is a critical requirement for Internet services. Existing approaches in cluster-based data storage rely on redundancy to survive a small number of failures, but the system becomes entirely unavailable if more failures occur. We describe an approach that allows a cluster file server to isolate failures so that the system can continue to

Minwen Ji; Edward W. Felten; Randolph Wang; Jaswinder Pal Singh

2000-01-01

281

A semantic file system for integrated product data management Oliver Eck a,  

E-print Network

with no automated sharing of data between them or links between their data. Presently, this is a significant of disadvantages of current file management systems. In the body of the paper our main contribution is presented data are often handled in separate Product Data Management (PDM) systems with no automated sharing

282

The self-adjusting file (SAF) system: An evidence-based update.  

PubMed

Current rotary file systems are effective tools. Nevertheless, they have two main shortcomings: They are unable to effectively clean and shape oval canals and depend too much on the irrigant to do the cleaning, which is an unrealistic illusionThey may jeopardize the long-term survival of the tooth via unnecessary, excessive removal of sound dentin and creation of micro-cracks in the remaining root dentin. The new Self-adjusting File (SAF) technology uses a hollow, compressible NiTi file, with no central metal core, through which a continuous flow of irrigant is provided throughout the procedure. The SAF technology allows for effective cleaning of all root canals including oval canals, thus allowing for the effective disinfection and obturation of all canal morphologies. This technology uses a new concept of cleaning and shaping in which a uniform layer of dentin is removed from around the entire perimeter of the root canal, thus avoiding unnecessary excessive removal of sound dentin. Furthermore, the mode of action used by this file system does not apply the machining of all root canals to a circular bore, as do all other rotary file systems, and does not cause micro-cracks in the remaining root dentin. The new SAF technology allows for a new concept in cleaning and shaping root canals: Minimally Invasive 3D Endodontics. PMID:25298639

Metzger, Zvi

2014-09-01

283

The self-adjusting file (SAF) system: An evidence-based update  

PubMed Central

Current rotary file systems are effective tools. Nevertheless, they have two main shortcomings: They are unable to effectively clean and shape oval canals and depend too much on the irrigant to do the cleaning, which is an unrealistic illusionThey may jeopardize the long-term survival of the tooth via unnecessary, excessive removal of sound dentin and creation of micro-cracks in the remaining root dentin. The new Self-adjusting File (SAF) technology uses a hollow, compressible NiTi file, with no central metal core, through which a continuous flow of irrigant is provided throughout the procedure. The SAF technology allows for effective cleaning of all root canals including oval canals, thus allowing for the effective disinfection and obturation of all canal morphologies. This technology uses a new concept of cleaning and shaping in which a uniform layer of dentin is removed from around the entire perimeter of the root canal, thus avoiding unnecessary excessive removal of sound dentin. Furthermore, the mode of action used by this file system does not apply the machining of all root canals to a circular bore, as do all other rotary file systems, and does not cause micro-cracks in the remaining root dentin. The new SAF technology allows for a new concept in cleaning and shaping root canals: Minimally Invasive 3D Endodontics.

Metzger, Zvi

2014-01-01

284

26 CFR 54.4980E-1 - Requirement of return and time for filing of the excise tax under section 4980E.  

Code of Federal Regulations, 2010 CFR

...Requirement of return and time for filing of the excise tax under section 4980E. 54.4980E-1 ...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.4980E-1 Requirement of...

2010-04-01

285

26 CFR 54.4980E-1 - Requirement of return and time for filing of the excise tax under section 4980E.  

Code of Federal Regulations, 2011 CFR

...Requirement of return and time for filing of the excise tax under section 4980E. 54.4980E-1 ...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.4980E-1 Requirement of...

2011-04-01

286

26 CFR 54.4980D-1 - Requirement of return and time for filing of the excise tax under section 4980D.  

Code of Federal Regulations, 2010 CFR

...Requirement of return and time for filing of the excise tax under section 4980D. 54.4980D-1 ...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.4980D-1 Requirement of...

2010-04-01

287

26 CFR 54.4980D-1 - Requirement of return and time for filing of the excise tax under section 4980D.  

Code of Federal Regulations, 2011 CFR

...Requirement of return and time for filing of the excise tax under section 4980D. 54.4980D-1 ...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.4980D-1 Requirement of...

2011-04-01

288

77 FR 7141 - Combined Notice of Filings #2  

Federal Register 2010, 2011, 2012, 2013

...Independent System Operator Corporation submits tariff filing per 35.13(a)(2)(iii: 2012-02-03 Att B--Marked Tariff MSG Enhancements.pdf to be effective 4/4/2012 under ER12-992. Filing Type: 10. Filed Date: 2/3/12. Accession...

2012-02-10

289

Forensic Analysis of File System Intrusions Using Improved Backtracking  

Microsoft Academic Search

Intrusion detection systems alert the system administra- tors of intrusions but, in most cases, do not provide de- tails about which system events are relevant to the intrusion and how the system events are related. We consider intru- sions of le systems. Existing tools, like BackTracker, help the system administrator backtrack from the detection point, which is a le with

Sriranjani Sitaraman; S. Venkatesan

2005-01-01

290

Layered Systems Under Shear Flow  

NASA Astrophysics Data System (ADS)

We discuss and review a generalization of the usual hydrodynamic description of smectic A liquid crystals motivated by the experimentally observed shear-induced destabilization and reorientation of smectic A like systems. We include both the smectic layering (via the layer displacement u and the layer normal hat{p}) and the director hat{n} of the underlying nematic order in our macroscopic hydrodynamic description and allow both directions to differ in non equilibrium situations. In a homeotropically aligned sample the nematic director couples to an applied simple shear, whereas the smectic layering stays unchanged. This difference leads to a finite (but usually small) angle between hat{n} and hat{p}, which we find to be equivalent to an effective dilatation of the layers. This effective dilatation leads, above a certain threshold, to an undulation instability of the layers with a wave vector parallel to the vorticity direction of the shear flow. We include the couplings of the velocity field with the order parameters for orientational and positional order and show how the order parameters interact with the undulation instability. We explore the influence of the magnitude of various material parameters on the instability. Comparing our results to available experimental results and molecular dynamic simulations, we find good qualitative agreement for the first instability. In addition, we discuss pathways to higher instabilities leading to the formation of onions (multilamellar vesicles) via cylindrical structures and/or the break-up of layers via large amplitude undulations.

Svenšek, Daniel; Brand, Helmut R.

291

36 CFR 1202.94 - What NARA systems of records are exempt from release under the Investigatory Information Material...  

Code of Federal Regulations, 2013 CFR

...2012-07-01 true What NARA systems of records are exempt from release under the Investigatory...1202.94 What NARA systems of records are exempt from release under the Investigatory...Case Files (NARA-24) system of records is...

2013-07-01

292

36 CFR 1202.94 - What NARA systems of records are exempt from release under the Investigatory Information Material...  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false What NARA systems of records are exempt from release under the Investigatory...1202.94 What NARA systems of records are exempt from release under the Investigatory...Case Files (NARA-24) system of records is...

2011-07-01

293

36 CFR 1202.94 - What NARA systems of records are exempt from release under the Investigatory Information Material...  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false What NARA systems of records are exempt from release under the Investigatory...1202.94 What NARA systems of records are exempt from release under the Investigatory...Case Files (NARA-24) system of records is...

2012-07-01

294

36 CFR 1202.94 - What NARA systems of records are exempt from release under the Investigatory Information Material...  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false What NARA systems of records are exempt from release under the Investigatory...1202.94 What NARA systems of records are exempt from release under the Investigatory...Case Files (NARA-24) system of records is...

2010-07-01

295

Operating System Concepts Silberschatz and Galvin 2004 revised by Wiseman12.1 File-System Structure  

E-print Network

Operating System Concepts Silberschatz and Galvin 2004 revised by Wiseman12.1 File allocation Operating System Concepts Silberschatz and Galvin 2004 revised by Wiseman12.2 Contiguous System Concepts Silberschatz and Galvin 2004 revised by Wiseman12.3 Contiguous Allocation of Disk Space

Wiseman, Yair

296

The global unified parallel file system (GUPFS) project: FY 2003 activities and results  

SciTech Connect

The Global Unified Parallel File System (GUPFS) project is a multiple-phase project at the National Energy Research Scientific Computing (NERSC) Center whose goal is to provide a scalable, high-performance, high-bandwidth, shared file system for all of the NERSC production computing and support systems. The primary purpose of the GUPFS project is to make the scientific users more productive as they conduct advanced scientific research at NERSC by simplifying the scientists' data management tasks and maximizing storage and data availability. This is to be accomplished through the use of a shared file system providing a unified file namespace, operating on consolidated shared storage that is accessible by all the NERSC production computing and support systems. In order to successfully deploy a scalable high-performance shared file system with consolidated disk storage, three major emerging technologies must be brought together: (1) shared/cluster file systems software, (2) cost-effective, high-performance storage area network (SAN) fabrics, and (3) high-performance storage devices. Although they are evolving rapidly, these emerging technologies individually are not targeted towards the needs of scientific high-performance computing (HPC). The GUPFS project is in the process of assessing these emerging technologies to determine the best combination of solutions for a center-wide shared file system, to encourage the development of these technologies in directions needed for HPC, particularly at NERSC, and to then put them into service. With the development of an evaluation methodology and benchmark suites, and with the updating of the GUPFS testbed system, the project did a substantial number of investigations and evaluations during FY 2003. The investigations and evaluations involved many vendors and products. From our evaluation of these products, we have found that most vendors and many of the products are more focused on the commercial market. Most vendors lack the understanding of, or do not have the resources to pay enough attention to, the needs of high-performance computing environments such as NERSC.

Butler, Gregory F.; Baird William P.; Lee, Rei C.; Tull, Craig E.; Welcome, Michael L.; Whitney Cary L.

2004-04-30

297

Taming aggressive replication in the Pangaea wide-area file system Yasushi Saito, Christos Karamanolis, Magnus Karlsson, and Mallik Mahalingam  

E-print Network

are in the same LAN, whereas some others are half way across the globe. Pangaea should transfer data between nodesTaming aggressive replication in the Pangaea wide-area file system Yasushi Saito, Christos {ysaito,christos,karlsson,mmallik}@hpl.hp.com Abstract Pangaea is a wide-area file system that supports

Pâris, Jehan-François

298

CHAIO: Enabling HPC Applications on Data-Intensive File Systems Hui Jin, Jiayu Ji, Xian-He Sun  

E-print Network

CHAIO: Enabling HPC Applications on Data-Intensive File Systems Hui Jin, Jiayu Ji, Xian-He Sun National Laboratory thakur@mcs.anl.gov ABSTRACT--The computing paradigm of "HPC in the Cloud" has gained of running HPC applications on top of data-intensive file systems is a critical catalyst in promoting Clouds

Sun, Xian-He

299

Research of the mobile-code-based file system for portable information device  

Microsoft Academic Search

While the mobile communication device is developing into the portable information device, it is necessary to design a distributed file-system in such a mobile environment. In order to do it, we must consider the relative shortage of the portable storage and low computation ability of a portable information device as well as unreliable and low-performance networks. By using mobile code

Yurong Xu; Shouqian Sun; Yunhe Pan

2001-01-01

300

Exploiting Unix File-System Races via Algorithmic Complexity Attacks xcai@cs.sunysb.edu  

E-print Network

], [15], [20], extensions to the Unix file-system interface[10], [33], and probabilis- tic user to sleep on I/O. Atomic k- race avoids sleeping on I/O with very high probability, so a maze attack to reliably sleep for a specific amount of time, and sleep-walking, which enables the attacker to do work

Johnson, Rob

301

76 FR 71019 - Amendment of Inspector General's Operation and Reporting (IGOR) System Investigative Files (EPA-40)  

Federal Register 2010, 2011, 2012, 2013

...government and other sources; forensic and other analyses; memoranda...public authority, for use in a computer matching program, as that...the System: Storage: In a computer database and in hard copy...file numbers. Safeguards: Computer records are maintained in...

2011-11-16

302

A Locality-Aware Cooperative Cache Management Protocol to Improve Network File System Performance  

E-print Network

A Locality-Aware Cooperative Cache Management Protocol to Improve Network File System Performance access patterns. We propose a locality-aware cooperative caching protocol, called LAC, that is based Columbus, OH 43210, USA {dingxn, zhang}@cse.ohio-state.edu Abstract In a distributed environment

Jiang, Song

303

Using Chord for meta-data management in the N3FS distributed file system  

Microsoft Academic Search

In this paper we present two alternative ways of implementing a meta-data management subsystem for the N3FS distributed file system using Chord. In order to obtain high availability in presence of node failures and network losses, we develop solutions based either on replication or on redundancy. In order to assess the relative merits of these alternatives in terms of performance

Cosimo Anglano; Andrea Ferrino

2004-01-01

304

Applying Informetric Characteristics of Databases to IR System File Design, Part II: Simulation Comparisons.  

ERIC Educational Resources Information Center

This second report on a two-part study on the application of informetrics to information retrieval (IR) system design used models of database contents in a factorial simulation study at the University of Western Ontario. The study explored whether different file structures were better suited for different informetric environments. (32 references)…

Wolfram, Dietmar

1992-01-01

305

Mining Logs Files for Data-Driven System Management School of Computer Science  

E-print Network

Mining Logs Files for Data-Driven System Management Wei Peng School of Computer Science Florida International University Miami, FL 33199 wpeng002@cs.fiu.edu Tao Li School of Computer Science Florida for trouble shooting rely on the knowledge and experience of domain experts to figure out ways to discover

Li, Tao

306

The Conquest File System: Better Performance Through a Disk/Persistent-RAM Hybrid Design  

E-print Network

performance, and 1.4x to 2.0x faster performance when exercising both memory and disk. Conquest realizes most;2 improvements of memory and CPU. Within the past ten years, these differences in access rates have widened. Current disk caching and RAM file systems either impose high overhead to access memory content or fail

Wang, Andy

307

Kosha: A Peer-to-Peer Enhancement for the Network File System  

E-print Network

Kosha: A Peer-to-Peer Enhancement for the Network File System Ali Raza Butt, Troy A. Johnson, Yili that compared to unmodified NFS, Kosha introduces a 4.1% fixed overhead and 1.5% additional over- head as nodes

Hu, Y. Charlie

308

Toward Data Confidentiality via Integrating Hybrid Encryption Schemes and Hadoop Distributed File System  

Microsoft Academic Search

With the increasing popularity of cloud computing, Hadoop has become a widely used open source cloud computing framework for large scale data processing. However, few studies have been done to enhance data confidentiality of Hadoop against storage servers. In this paper, we address the data confidentiality issue by integrating hybrid encryption schemes and the Hadoop distributed file system (HDFS). We

Hsiao-Ying Lin; Shiuan-Tzuo Shen; Wen-Guey Tzeng; Bao-Shuh P. Lin

2012-01-01

309

INFORMATION AND CONTROL IN FILE SYSTEM BUFFER MANAGEMENT Nathan Christopher Burnett  

E-print Network

INFORMATION AND CONTROL IN FILE SYSTEM BUFFER MANAGEMENT by Nathan Christopher Burnett, Erik Paulson, David Parter, Nathan Cunningham, William Annis, Eric #12;ii Oehler, Matt Lockett, Regan provided immeasurable support and advice during my time at Wisconsin. Nathan, though an unlikely friend

Arpaci-Dusseau, Andrea

310

INFORMATION AND CONTROL IN FILE SYSTEM BUFFER MANAGEMENT Nathan Christopher Burnett  

E-print Network

INFORMATION AND CONTROL IN FILE SYSTEM BUFFER MANAGEMENT by Nathan Christopher Burnett, Erik Paulson, David Parter, Nathan Cunningham, William Annis, Eric #12; ii Oehler, Matt Lockett, Regan provided immeasurable support and advice during my time at Wisconsin. Nathan, though an unlikely friend

Arpaci-Dusseau, Andrea

311

Binary authentication signatures integrity standard: System file integrity for the masses  

SciTech Connect

Thrusted software plays a central role in computer security, yet straightforward methods for authentication of installed software are lacking in the marketplace. This paper argues for a vendor-supported standard for the generation and publication of strong digital signature for all vendor-supplied system files. Progress in the design and adoption of a proposed standard is discussed.

Bartoletti, T. [Lawrence Livermore National Lab., CA (United States); Graff, M. [Sun Microsystems, Inc. (United States); Schales, D. [Texas A and M Univ., College Station, TX (United States)

1994-03-01

312

Free-Riding on BitTorrent-Like Peer-to-Peer File Sharing Systems: Modeling  

E-print Network

Free-Riding on BitTorrent-Like Peer-to-Peer File Sharing Systems: Modeling Analysis and Improvement contribution and prevent free-riding. However, BitTorrent's ability to prevent free-riding needs further study. In this paper, we present a fluid model with two different classes of peers to capture the effect of free

Wu, Jie

313

SEFS: Security Module for Extensible File System Architectures  

Microsoft Academic Search

Data security is a fundamental issue in modern com- puter systems. In particular, data storage systems are frequently subject to attacks and so need protection. Typical storage systems rely on access control mecha- nisms, either physical or logical, to prevent unautho- rized users from accessing stored data. However, such mechanisms are useless against non-ethical attitudes taken by privileged users, like

Lu ´ is Ferreira

314

SEFS: Security Module for Extensible File System Architectures  

Microsoft Academic Search

Data security is a fundamental issue in modern com- puter systems. In particular, data storage systems are frequently subject to attacks and so need protection. Typical storage systems rely on access control mecha- nisms, either physical or logical, to prevent unautho- rized users from accessing stored data. However, such mechanisms are useless against non-ethical attitudes taken by privileged users, like

Lu ´ õs; AndreZ Ferreira

2000-01-01

315

Endodontic treatment of mandibular molar with root dilaceration using Reciproc single-file system  

PubMed Central

Biomechanical preparation of root canals with accentuated curvature is challenging. New rotatory systems, such as Reciproc, require a shorter period of time to prepare curved canals, and became a viable alternative for endodontic treatment of teeth with root dilaceration. Thus, this study aimed to report a clinical case of endodontic therapy of root with accentuated dilaceration using Reciproc single-file system. Mandibular right second molar was diagnosed as asymptomatic irreversible pulpitis. Pulp chamber access was performed, and glide path was created with #10 K-file (Dentsply Maillefer) and PathFile #13, #16 and #19 (Dentsply Maillefer) up to the temporary working length. The working length measured corresponded to 20 mm in the mesio-buccal and mesio-lingual canals, and 22 mm in the distal canal. The R25 file (VDW GmbH) was used in all the canals for instrumentation and final preparation, followed by filling with Reciproc gutta-percha cones (VDW GmbH) and AH Plus sealer (Dentsply Maillefer), using thermal compaction technique. The case has been receiving follow-up for 6 mon and no painful symptomatology or periapical lesions have been found. Despite the difficulties, the treatment could be performed in a shorter period of time than the conventional methods. PMID:24010084

Meireles, Daniely Amorin; Bastos, Mariana Mena Barreto; Marques, Andre Augusto Franco; Sponchiado, Emilio Carlos

2013-01-01

316

An Evaluation of Power-Proportional Data Placement for Hadoop Distributed File Systems  

Microsoft Academic Search

Power-saving storage in data centers is now gaining much interest because of the increase in power requirements. In particular, with the expansion of services requiring distributed-processing frameworks, power proportionality in power-aware file systems is attracting great attention from academia and industry. The concept of power proportionality is that a system should perform work in proportion to the energy it consumes.

Hieu Hanh Le; Satoshi Hikida; Haruo Yokota

2011-01-01

317

gVault: A Gmail Based Cryptographic Network File System  

Microsoft Academic Search

In this paper, we present the design of gVault, a crypto- graphic network flle system that utilizes the data storage provided by Gmail's web-based email service. Such a flle system efiectively provides users with an easily accessible free network drive on the Internet. gVault provides numerous beneflts to the users, including: a) Secure remote ac- cess: Users can access their

Ravi Chandra Jammalamadaka; Roberto Gamboni; Sharad Mehrotra; Kent E. Seamons; Nalini Venkatasubramanian

2007-01-01

318

76 FR 76477 - Generalized System of Preferences (GSP): Extension of Deadlines for Filing Petitions for the 2011...  

Federal Register 2010, 2011, 2012, 2013

...UNITED STATES TRADE REPRESENTATIVE Generalized System of Preferences (GSP): Extension of Deadlines for Filing Petitions for...S. Trade Representative for the Generalized System of Preferences and Chair of the GSP Subcommittee of the Trade Policy...

2011-12-07

319

Network-Aware Adaptation Techniques for Mobile File Systems  

Microsoft Academic Search

Wireless networks present unusual challenges for mobile le system clients, since they are characterised by unpredictable connectivity and widely-varying bandwidth. The traditional ap- proach to adapting network communication to these conditions is to write back le updates asynchronously when bandwidth is low. Unfortunately, this can lead to underutilisation of band- width and inconsistencies between clients. We describe a new mobile

Benjamin Atkin; Kenneth P. Birman

2006-01-01

320

A File Allocation Strategy for Energy-Efficient Disk Storage Systems  

SciTech Connect

Exponential data growth is a reality for most enterprise and scientific data centers.Improvements in price/performance and storage densities of disks have made it both easy and affordable to maintain most of the data in large disk storage farms. The provisioning of disk storage farms however, is at the expense of high energy consumption due to the large number of spinning disks. The power for spinning the disks and the associated cooling costs is a significant fraction of the total power consumption of a typical data center. Given the trend of rising global fuel and energy prices and the high rate of data growth, the challenge is to implement appropriateconfigurations of large scale disk storage systems that meet performancerequirements for information retrieval across data centers. We present part of the solution to this challenge with an energy efficient file allocation strategy on a large scale disk storage system. Given performance characteristics of thedisks, and a profile of the workload in terms of frequencies of file requests and their sizes, the basic idea is to allocate files to disks such that the disks can be configured into two sets of active (constantly spinning), and passive (capable of being spun up or down) disk pools. The goal is to minimize the number of active disks subject to I/O performance constraints. We present an algorithm for solving this problem with guaranteed bounds from the optimal solution. Our algorithm runs in O(n) time where n is the number of files allocated. It uses a mapping of our file allocation problem to a generalization of the bin packing problem known as 2-dimensional vector packing. Detailed simulation results are also provided.

Otoo, Ekow J; Otoo, Ekow J.; Rotem, Doron; Pinar, Ali; Tsao, Shi-Chiang

2008-06-27

321

Visualization of Command Interpreter for The Unix File System  

E-print Network

University of Tsukuba Unix Unix Unix Tcl/Tk 1 Unix Unix [1] WIMP OS Windows95 GUI Unix X Windows System GUI Unix [2][3] Unix Unix OS Windows95 OS Windows95 Unix 2 Unix 1 Unix Tcl/Tk[4] 1 5 4 20 |1| #12?,directory? 4 Tcl/Tk Unix frame button menubutton label pack but- ton frame label entry pack label ,******** 5

Tanaka, Jiro

322

Evaluation and Analysis of GreenHDFS: A Self-Adaptive, Energy-Conserving Variant of the Hadoop Distributed File System  

E-print Network

scalable variant of the Hadoop Distributed File System (HDFS) called Green- HDFS. GreenHDFS logically-scale, highly resilient object-based cluster stor- age managed by Hadoop Distributed File System (HDFS) [25 Distributed File System Rini T. Kaushik University of Illinois, Urbana-Champaign kaushik1@illinois.edu Milind

Nahrstedt, Klara

323

ERIC Online Retrieval System. Use of the DIALOG Online Information Retrieval System with ERIC Research in Education Files. Final Report.  

ERIC Educational Resources Information Center

The utility of computer based on-line retrieval of material from the ERIC document files was tested by members of the ERIC Clearinghouse on Educational Media and Technology at Stanford University and by the Region IX office of the U.S. Office of Education in San Francisco. The DIALOG retrieval system developed by the Information Sciences Group of…

Summit, Roger K.

324

UCIWebFiles WebBasedFileSharing  

E-print Network

on WebFiles. I deleted a file. How do I get it back? WebFiles moves deleted files to the Trash folder will remain in the Trash until you click "Empty Trash" under the Utilities menu in the left pane. Do not "Empty Trash" until you are sure you will no longer need any of the files stored there. Once a file has

Brody, James P.

325

Computer printing and filing of microbiology reports. 1. Description of the system  

Microsoft Academic Search

From March 1974 all reports from this microbiology department have been computer printed and filed. The system was designed to include every medically important microorganism and test. Technicians at the laboratory bench made their results computer-readable using Port-a-punch cards, and specimen details were recorded on paper-tape, allowing the full description of each specimen to appear on the report. A summary

C S Goodwin; B C Smith

1976-01-01

326

Log-Less Metadata Management on Metadata Server for Parallel File Systems  

PubMed Central

This paper presents a novel metadata management mechanism on the metadata server (MDS) for parallel and distributed file systems. In this technique, the client file system backs up the sent metadata requests, which have been handled by the metadata server, so that the MDS does not need to log metadata changes to nonvolatile storage for achieving highly available metadata service, as well as better performance improvement in metadata processing. As the client file system backs up certain sent metadata requests in its memory, the overhead for handling these backup requests is much smaller than that brought by the metadata server, while it adopts logging or journaling to yield highly available metadata service. The experimental results show that this newly proposed mechanism can significantly improve the speed of metadata processing and render a better I/O data throughput, in contrast to conventional metadata management schemes, that is, logging or journaling on MDS. Besides, a complete metadata recovery can be achieved by replaying the backup logs cached by all involved clients, when the metadata server has crashed or gone into nonoperational state exceptionally. PMID:24892093

Xiao, Guoqiang; Peng, Xiaoning

2014-01-01

327

Partial Migration in an 8mm Tape Based Tertiary Storage File System and its Performance Evaluation through Satellite Image Processing Applications  

Microsoft Academic Search

Recent attention on global environmental changes has stimulated the development of large scale global information systems. Satellite images play a very important role for understanding these global changes. However, the data size is very large and current commercial hierarchical file management systems are not efficient enough to handle such huge data files. Migration of a whole file from tape to

Kazuhiko Sako; Toshihiro Nemoto; Masaru Kitsuregawa; Mikio Takagi

1995-01-01

328

This appeared in SIGOPS Operating Systems Review, vol. 32, no. 1, pp. 2940, January 1998 Optimizing Throughput in a Workstationbased Network File System  

E-print Network

. Keywords: Distributed Systems, Network File Systems, High Speed LANs 1. Introduction This paper describes of emerging local area networks (LANs). It concentrates on improving the bulk data transfer capability,2] write bandwidth using the ATOMIC LAN[3] when files are not written to disk. The cost of implementation

Faber, Ted

329

This appeared in SIGOPS Operating Systems Review, vol. 32, no. 1, pp. 29-40, January 1998 Optimizing Throughput in a Workstation-based Network File System  

E-print Network

. Keywords: Distributed Systems, Network File Systems, High Speed LANs 1. Introduction This paper describes of emerging local area networks (LANs). It concentrates on improving the bulk data transfer capability,2] write bandwidth using the ATOMIC LAN[3] when files are not written to disk. The cost of implementation

Faber, Ted

330

26 CFR 54.6091-1 - Place for filing excise tax returns under section 4980B, 4980D, 4980E, or 4980G.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Place for filing excise tax returns under section 4980B, 4980D, 4980E...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.6091-1 Place for...

2011-04-01

331

26 CFR 54.6091-1 - Place for filing excise tax returns under section 4980B, 4980D, 4980E, or 4980G.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Place for filing excise tax returns under section 4980B, 4980D, 4980E...OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) PENSION EXCISE TAXES § 54.6091-1 Place for...

2010-04-01

332

17 CFR 274.200 - Form N-17D-1, report filed by small business investment company (SBIC) registered under the...  

Code of Federal Regulations, 2010 CFR

Form N-17D-1, report filed by small business investment company (SBIC) registered under the Investment Company Act of 1940 and an affiliated bank, with respect to investments by the SBIC and the bank, submitted pursuant to paragraph (d)(3) of § 270.17d-1 of this chapter....

2010-04-01

333

26 CFR 157.6081-1 - Automatic extension of time for filing a return due under chapter 55.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Automatic extension of time for filing a return...and Administration § 157.6081-1 Automatic extension of time for filing a return...Transactions”, will be allowed an automatic 6-month extension of time to...

2010-04-01

334

26 CFR 55.6081-1 - Automatic extension of time for filing a return due under Chapter 44.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Automatic extension of time for filing a return...and Administration § 55.6081-1 Automatic extension of time for filing a return...Investment Companies,” will be allowed an automatic 6-month extension of time to...

2010-04-01

335

26 CFR 156.6081-1 - Automatic extension of time for filing a return due under chapter 54.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Automatic extension of time for filing a return...and Administration § 156.6081-1 Automatic extension of time for filing a return...on Greenmail,” will be allowed an automatic 6-month extension of time to...

2010-04-01

336

Optimization of system redundancy under multiple constraints  

E-print Network

OPTIMIZATION OF SYSTEM REDUNDANCY UNDER MULTIPLE CONSTRAINTS A Thesis By GARY ROLAND CAREY Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE January... 1967 Major Subject: Industrial Engineering OPTIMIZATION OF SYSTEM REDUNDANCY UNDER MULTIPLE CONSTRAINTS A Thesis By GARY ROLAND CAREY Approved as to style and content by: (Chairman of Committee) (Head of Department) (Member) (Member) January...

Carey, Gary Roland

2012-06-07

337

Text File Comparator  

NASA Technical Reports Server (NTRS)

File Comparator program IFCOMP, is text file comparator for IBM OS/VScompatable systems. IFCOMP accepts as input two text files and produces listing of differences in pseudo-update form. IFCOMP is very useful in monitoring changes made to software at the source code level.

Kotler, R. S.

1983-01-01

338

Standard interface file handbook  

SciTech Connect

This handbook documents many of the standard interface file formats that have been adopted by the US Department of Energy to facilitate communications between and portability of, various large reactor physics and radiation transport software packages. The emphasis is on those files needed for use of the VENTURE/PC diffusion-depletion code system. File structures, contents and some practical advice on use of the various files are provided.

Shapiro, A.; Huria, H.C. [Cincinnati Univ., OH (United States)

1992-10-01

339

Evaluation of clinical data in childhood asthma. Application of a computer file system  

SciTech Connect

A computer file system was used in our pediatric allergy clinic to assess the value of chest roentgenograms and hemoglobin determinations used in the examination of patients and to correlate exposure to pets and forced hot air with the severity of asthma. Among 889 children with asthma, 20.7% had abnormal chest roentgenographic findings, excluding hyperinflation and peribronchial thickening, and 0.7% had abnormal hemoglobin values. Environmental exposure to pets or forced hot air was not associated with increased severity of asthma, as assessed by five measures of outcome: number of medications administered, requirement for corticosteroids, frequency of clinic visits, frequency of emergency room visits, and frequency of hospitalizations.

Fife, D.; Twarog, F.J.; Geha, R.S.

1983-10-01

340

Bayesian system reliability assessment under fuzzy environments  

Microsoft Academic Search

The Bayesian system reliability assessment under fuzzy environments is proposed in this paper. In order to apply the Bayesian approach, the fuzzy parameters are assumed as fuzzy random variables with fuzzy prior distributions. The (conventional) Bayes estimation method will be used to create the fuzzy Bayes point estimator of system reliability by invoking the well-known theorem called ‘Resolution Identity’ in

Hsien-Chung Wu

2004-01-01

341

76 FR 63537 - Mandatory Electronic Filing for Agencies and Attorneys at Washington Regional Office and Denver...  

Federal Register 2010, 2011, 2012, 2013

This rule informs the public that the U.S. Merit Systems Protection Board (MSPB or Board) is launching a pilot program under which the Washington Regional Office (WRO) and Denver Field Office (DEFO) will require all pleadings filed by agencies and attorneys who represent appellants in MSPB proceedings to be electronically filed (e- filed). This requirement will apply to all pleadings except those......

2011-10-13

342

Cartographic Boundary Files  

NSDL National Science Digital Library

The Cartographic Boundary Files Web site from the US Census Bureau contains "generalized extracts from the Census Bureau's TIGER geographic database for use in a Geographic Information System (GIS) or similar mapping systems." The files are mainly from the 2000 census and contain such things as Congressional Districts, School Districts, Urbanized Areas, and more. The Descriptions and Metadata link gives users an idea of what is contained in each file before downloading, and the Download Boundary Files link lists each file that can than be downloaded, all available in several formats.

2001-01-01

343

Comparison of Autoclaving Effects on Torsional Deformation and Fracture Resistance of Three Innovative Endodontic File Systems  

Microsoft Academic Search

IntroductionRecent innovative manufacturing techniques have produced nickel-titanium (NiTi) rotary instruments with reports of superior properties compared with standard NiTi files. These include Profile Vortex made from M-Wire (PV), Twisted Files (TF), and 10 Series files made from CM Wire (CM). Sterilization is recommended before use and is repeated if files are reused and\\/or carried forward between cases. The purpose for

Rhett B. Casper; Howard W. Roberts; Mark D. Roberts; Van T. Himel; Brian E. Bergeron

2011-01-01

344

17 CFR 230.425 - Filing of certain prospectuses and communications under § 230.135 in connection with business...  

Code of Federal Regulations, 2010 CFR

...230.135 in connection with business combination transactions. 230.425 Section...230.135 in connection with business combination transactions. (a) All written...Company Act file number, in the upper right corner of the cover page. (d)...

2010-04-01

345

26 CFR 55.6081-1 - Automatic extension of time for filing a return due under Chapter 44.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) EXCISE TAX ON REAL ESTATE INVESTMENT TRUSTS AND REGULATED...required to file a return on Form 8612, “Return of Excise Tax on Undistributed Income of Real Estate...

2011-04-01

346

26 CFR 157.6081-1 - Automatic extension of time for filing a return due under chapter 55.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF THE TREASURY (CONTINUED) MISCELLANEOUS EXCISE TAXES (CONTINUED) EXCISE TAX ON STRUCTURED SETTLEMENT FACTORING TRANSACTIONS...taxpayer required to file a return on Form 8876, “Excise Tax on Structured Settlement Factoring...

2011-04-01

347

26 CFR 55.6081-1 - Automatic extension of time for filing a return due under Chapter 44.  

Code of Federal Regulations, 2013 CFR

(1) Submit a complete application on Form 7004, “Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns,” or in any other manner prescribed by the...

2013-04-01

348

Optimal file-bundle caching algorithms for data-grids  

SciTech Connect

The file-bundle caching problem arises frequently in scientific applications where jobs need to process several files simultaneously. Consider a host system in a data-grid that maintains a staging disk or disk cache for servicing jobs of file requests. In this environment, a job can only be serviced if all its file requests are present in the disk cache. Files must be admitted into the cache or replaced in sets of file-bundles, i.e. the set of files that must all be processed simultaneously. In this paper we show that traditional caching algorithms based on file popularity measures do not perform well in such caching environments since they are not sensitive to the inter-file dependencies and may hold in the cache non-relevant combinations of files. We present and analyze a new caching algorithm for maximizing the throughput of jobs and minimizing data replacement costs to such data-grid hosts. We tested the new algorithm using a disk cache simulation model under a wide range of conditions such as file request distributions, relative cache size, file size distribution, etc. In all these cases, the results show significant improvement as compared with traditional caching algorithms.

Otoo, Ekow; Rotem, Doron; Romosan, Alexandru

2004-04-24

349

The File Catalog System at FLASH: Jrgen Maass (MCS4) and Pedro Castro (MPY)  

E-print Network

;Difference ! file format XML formal3-column format #12;Less used features: insert new address #12;Less used much SASE? for bypass or for SASE? taken with beam? or search in e-logbook (good luck!) #12;2) catalog of files: beamlinewavelength how much SASE #12;2) catalog of files: how to search: using the filters #12

350

File Migration and File Replication: A Symbiotic Relationship  

Microsoft Academic Search

Much of the past research on file migration and file replication has examined these two resource management strategies in isolation or in an environment where they do not work together. We establish through simulation that these two strategies can be utilized simultaneously to potentially provide significant performance benefits over a system without file migration or replication. File replication can be

Richard T. Hurley; Soon Aun Yeap

1996-01-01

351

File under Fleeting  

ERIC Educational Resources Information Center

Archives have always had an aura of neutrality and coolness that masks the heat behind the data they record: births, marriages, crimes, wars, business dealings, genocides and deaths. Long thought of as the musty haunts of scholars with a specialized interest in the demographics of Rome or 15th-century France, archives have been seen as controlled…

Torgovnick, Marianna

2008-01-01

352

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 48, NO. 5, OCTOBER 2001 891 Optimal File Placement in VOD System  

E-print Network

of genetic algorithm and modified bin-packing algorithm is then developed for the multi- media file placement system while the solution is obtained effectively by an iterative approach. A genetic algorithm, together Placement in VOD System Using Genetic Algorithm Kit-Sang Tang, Member, IEEE, King-Tim Ko, Member, IEEE

Coello, Carlos A. Coello

353

An in-vitro Evaluation of canal transportation and centering ability of two rotary Nickel Titanium systems (Twisted Files and Hyflex files) with conventional stainless Steel hand K-flexofiles by using Spiral Computed Tomography  

PubMed Central

Background: The purpose of this in-vitro study was to compare canal transportation and centering ability of Twisted and Hyflex Rotary Files with stainless steel hand k-flexofiles by using Spiral Computed Tomography. Materials & Methods: A total of 90 freshly extracted human mandibular single rooted Premolar teeth were selected. The crowns were flattened with steel disks and a final dimension of 18-mm WL was achieved for each tooth. Canals were divided randomly into 3 groups of 30 teeth each. Group I:Hyflex files, Group II:Twisted files, Group III:stainless steel hand k-flexofiles. Three sections from apical, mid-root, and coronal levels of the canal were recorded. All the teeth were scanned before and after instrumentation by using Spiral Computed Tomography. Results: K-files showed highest transportation and less centered when compared to the Twisted and Hyflex rotary files. No significant difference was found between TF and Hyflex CM instruments. Conclusion: TF and Hyflex files shaped curved root canals without significant shaping errors when compared to the Hand stainless steel k-flexofiles. How to cite this article: Kumar BS, Pattanshetty S, Prasad M, Soni S, Pattanshetty KS, Prasad S. An in-vitro Evaluation of canal transportation and centering ability of two rotary Nickel Titanium systems (Twisted Files and Hyflex files) with conventional stainless Steel hand K-flexofiles by using Spiral Computed Tomography. J Int Oral Health 2013;5(5):108-15. PMID:24324313

Kumar, B Shiva; Pattanshetty, Spoorti; Prasad, Manju; Soni, Sunny; Pattanshetty, Kirti S; Prasad, Shiva

2013-01-01

354

76 FR 60014 - Combined Notice of Filings  

Federal Register 2010, 2011, 2012, 2013

...filings: Filings Instituting Proceedings Docket Numbers: RP11-2573-000. Applicants: Iroquois Gas Transmission System, L.P. Description: Iroquois Gas Transmission System, L.P. submits tariff filing per 154.204: 09/21/11...

2011-09-28

355

78 FR 79432 - Combined Notice of Filings  

Federal Register 2010, 2011, 2012, 2013

...filings: Filings Instituting Proceedings Docket Numbers: RP14-293-000. Applicants: Iroquois Gas Transmission System, L.P. Description: Iroquois Gas Transmission System, L.P. submits tariff filing per 154.204: 12/17/13...

2013-12-30

356

78 FR 35621 - Combined Notice of Filings #1  

Federal Register 2010, 2011, 2012, 2013

...Applicants: California Independent System Operator Corporation, AES Huntington Beach, L.L.C. Description: Amendments to RMR Agreement Under Docket ER13-1630 to be effective 6/26/2013. Filed Date: 6/5/13. Accession Number:...

2013-06-13

357

Permanent-File-Validation Utility Computer Program  

NASA Technical Reports Server (NTRS)

Errors in files detected and corrected during operation. Permanent File Validation (PFVAL) utility computer program provides CDC CYBER NOS sites with mechanism to verify integrity of permanent file base. Locates and identifies permanent file errors in Mass Storage Table (MST) and Track Reservation Table (TRT), in permanent file catalog entries (PFC's) in permit sectors, and in disk sector linkage. All detected errors written to listing file and system and job day files. Program operates by reading system tables , catalog track, permit sectors, and disk linkage bytes to vaidate expected and actual file linkages. Used extensively to identify and locate errors in permanent files and enable online correction, reducing computer-system downtime.

Derry, Stephen D.

1988-01-01

358

Securing the AliEn File Catalogue - Enforcing authorization with accountable file operations  

NASA Astrophysics Data System (ADS)

The AliEn Grid Services, as operated by the ALICE Collaboration in its global physics analysis grid framework, is based on a central File Catalogue together with a distributed set of storage systems and the possibility to register links to external data resources. This paper describes several identified vulnerabilities in the AliEn File Catalogue access protocol regarding fraud and unauthorized file alteration and presents a more secure and revised design: a new mechanism, called LFN Booking Table, is introduced in order to keep track of access authorization in the transient state of files entering or leaving the File Catalogue. Due to a simplification of the original Access Envelope mechanism for xrootd-protocol-based storage systems, fundamental computational improvements of the mechanism were achieved as well as an up to 50% reduction of the credential's size. By extending the access protocol with signed status messages from the underlying storage system, the File Catalogue receives trusted information about a file's size and checksum and the protocol is no longer dependent on client trust. Altogether, the revised design complies with atomic and consistent transactions and allows for accountable, authentic, and traceable file operations. This paper describes these changes as part and beyond the development of AliEn version 2.19.

Schreiner, Steffen; Bagnasco, Stefano; Sankar Banerjee, Subho; Betev, Latchezar; Carminati, Federico; Vladimirovna Datskova, Olga; Furano, Fabrizio; Grigoras, Alina; Grigoras, Costin; Mendez Lorenzo, Patricia; Peters, Andreas Joachim; Saiz, Pablo; Zhu, Jianlin

2011-12-01

359

Management of the Israeli National Water System under Uncertainty  

NASA Astrophysics Data System (ADS)

Uncertainty in our region is due to the natural variability of hydrological patterns, with recurring extended droughts, reduced average and broadening variability of recharge that seem to indicate the effect of climate change, as well as to deterioration of water quality in the natural sources, to population growth and distribution, to shifting demand patterns among consumer sectors, and to expected future regional water agreements. These factors combine to create a challenging environment in which highly stressed water resources and water systems have to be developed, operated and managed. The natural sources have been used to their sustainable capacity and often beyond. The main policy responses are a shift of fresh water from agriculture to the cities, replacing it with treated wastewater for irrigation, and a major program for construction of sea-water desalination plants and the associated infrastructure needed for its integration into the supply systems. Organizational reforms, regulation, and demand management options are also being developed, including full-cost pricing. Management of the water resources and systems under these conditions requires a long-term perspective. The methodologies for supporting management decisions that have been used to date by the Israeli Water Authority include evaluation by scenarios, simulation, and optimization with sensitivity analysis. We review existing approaches and models for management of the Israeli water system (Zaide 2006) and then present some new methodologies for addressing operational decisions under hydrological uncertainty, which include generation of tradeoffs between the expected value and variability of the outcomes, and an Info-Gap (Ben-Haim 2006) based approach. These methodologies are demonstrated on examples that emulate portions of a regional water system and are then applied to the Israeli National Water System. Ben-Haim, Y. (2006) Info-Gap Theory: Decisions under Severe Uncertainty, 2nd Ed., Academic Press, London. Zaide, M. (2006) A Model for Management of Water Quantity and Quality in the Israeli National System", MSc Thesis, Faculty of Civil Engineering, Technion. http://urishamir.wri.technion.ac.il/files/documents/Miki%20Zaide%20-%20Thesis%20Final%2015.03.06.pdf

Shamir, U.; Housh, M.; Ostfeld, A.; Zaide, M.

2009-12-01

360

On Evaluating Decentralized Parallel I\\/O Scheduling Strategies for Parallel File Systems  

Microsoft Academic Search

Abstract. This paper evaluates the impact of the parallel I\\/O scheduling strat-egy on the performance of the file access in a parallel file syst em for clusters of commodity computers (Clusterfile). We argue that the para llel I\\/O schedul-ing strategy should be seen as a complement to other file acces s optimizations like striping over several I\\/O servers, non-contiguous I\\/O

Florin Isaila; David E. Singh; Jesús Carretero; Félix García

2006-01-01

361

26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).  

Code of Federal Regulations, 2013 CFR

...pursuant to section 1503(d) and these...person in writing within 120 days of the filing if it is...this purpose, the 120-day period shall begin on...again notified within 120 days, then the taxpayer...rules of section 1503(d) and these...

2013-04-01

362

26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).  

Code of Federal Regulations, 2011 CFR

...pursuant to section 1503(d) and these...person in writing within 120 days of the filing if it is...this purpose, the 120-day period shall begin on...again notified within 120 days, then the taxpayer...rules of section 1503(d) and these...

2011-04-01

363

26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).  

Code of Federal Regulations, 2012 CFR

...pursuant to section 1503(d) and these...person in writing within 120 days of the filing if it is...this purpose, the 120-day period shall begin on...again notified within 120 days, then the taxpayer...rules of section 1503(d) and these...

2012-04-01

364

26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).  

...pursuant to section 1503(d) and these...person in writing within 120 days of the filing if it is...this purpose, the 120-day period shall begin on...again notified within 120 days, then the taxpayer...rules of section 1503(d) and these...

2014-04-01

365

E-Government and Citizen Adoption of Innovations: Factors Underlying Citizen Use of the Internet for State Tax Filing  

ERIC Educational Resources Information Center

Electronic government has been embraced by many organizations seeking to dramatically improve service delivery, but results to date have often fallen short of expectations. This dissertation is focused on state revenue agencies and their electronic tax filing mechanisms for state individual income taxes. It asks: What factors best explain whether…

Boone, Michael A.

2012-01-01

366

Operating System Concepts with Java 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne 2007 Chapter 17: Distributed-File Systems  

E-print Network

Operating System Concepts with Java ­ 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne ©2007 Chapter 17: Distributed-File Systems #12;17.2 Silberschatz, Galvin and Gagne ©2007Operating System;17.3 Silberschatz, Galvin and Gagne ©2007Operating System Concepts with Java ­ 7th Edition, Nov 15, 2006 Chapter

Bezrukov, Sergei

367

ncBrowse: A Graphical netCDF File Browser  

NSDL National Science Digital Library

This Java application provides interactive browsing of data and metadata netCDF file formats written under a wide range of netCDF file conventions. It features flexibility in accommodating a very wide range of netCDF files, user assignment of axes, and interactive, zoomable scientific graphics displays, including a self-scaling time axis. ncBrowse can read network accessible files, and includes Distributed Ocean Data System (DODS) and OPeNDAP support. Supported for Unix, Mac and PC hardware platforms.

368

It's Tax Filing Season deadline April 17, 2012! This year, tax time is especially hectic because we have just transitioned from the Glacier system to the  

E-print Network

It's Tax Filing Season ­ deadline April 17, 2012! This year, tax time is especially hectic because we have just transitioned from the Glacier system to the Windstar International Tax Navigation system with both the software transition and 2011 tax filing: For Non-Residents Aliens for US Tax Purposes, we

Bordenstein, Seth

369

LightFlood: an Efficient Flooding Scheme for File Search in Unstructured Peer-to-Peer Systems  

E-print Network

LightFlood: an Efficient Flooding Scheme for File Search in Unstructured Peer-to-Peer Systems Williamsburg, VA 23187, USA¡ sjiang, lguo, zhang¢ @cs.wm.edu Abstract "Flooding" is a fundamental operation search, flooding is very in- efficient because it results in a great amount of redundant messages. Our

Jiang, Song

370

March 28, 2013 11:18 WSPC/INSTRUCTION FILE roth-acs-proofs Advances in Complex Systems  

E-print Network

March 28, 2013 11:18 WSPC/INSTRUCTION FILE roth-acs-proofs Advances in Complex Systems c World Scientific Publishing Company SOCIO-SEMANTIC FRAMEWORKS CAMILLE ROTH CNRS Centre d'Analyse et de Math/HU/MAE, Friedrichstrasse 191, Berlin, D-10117, Germany roth@cmb.hu-berlin.de Received (received date) Revised (revised date

Paris-Sud XI, Université de

371

Effect of Patency File on Transportation and Curve Straightening in Canal Preparation with ProTaper System  

PubMed Central

The aim of this ex vivo study was to evaluate the effect of using a patency file on apical transportation and curve straightening during canal instrumentation with the ProTaper rotary system. Seventy permanent mandibular first molars with mesiobuccal canals, measuring 18–23?mm in length and with a 25–40° curvature (according to the Schneider method), were selected. The working lengths were determined and the teeth were mounted and divided into two experimental groups: (A) prepared by the ProTaper system without using a patency file (n = 35) and (B) prepared by the ProTaper system using a patency file (n = 35). Radiographs taken before and after the preparation were imported into Photoshop software and the apical transportation, and curve straightening were measured. Data were analyzed using independent t-test. Partial correlation analysis was performed to evaluate the relationship between the initial curvature, transportation, and curve straightening (? = 0.05). Using a patency file during canal preparation significantly decreased both apical transportation and curve straightening (P < 0.001). There were significant relationships between the angle of curvature, transportation and curve straightening in pairs (P < 0.001). Apical patency is recommended during root canal preparation with the ProTaper rotary system. PMID:24159390

Hasheminia, Seyed Mohsen

2013-01-01

372

Parallel File System Testing for the Lunatic Fringe: The Care and Feeding of Restless I\\/O Power Users  

Microsoft Academic Search

Over the last several years there has been a major thrust at the Lawrence Livermore National Laboratory toward building extremely large scale computing clusters based on open source software and commodity hardware. On the storage front, our efforts have focused upon the development of the Lustre file system and bringing it into production in our computer center. Given our customers'

Richard Hedges; Bill Loewe; Tyce Mclarty; Chris Morrone

2005-01-01

373

Cooperative Caching: Using Remote Client Memory to Improve File System Performance  

Microsoft Academic Search

Emerging high-speed networks will allow machines to access remote data nearly as quickly as they can access local data. This trend motivates the use of cooperative caching: coordinating the file caches of many machines distributed on a LAN to form a more effective overall file cache. In this paper we examine four cooperative caching algorithms using a trace-driven simulation study.

Michael D. Dahlin; Randolph Y. Wang; Thomas E. Anderson; David A. Patterson

1994-01-01

374

STREAM-ENABLED FILE I/O FOR EMBEDDED SYSTEMS Pramote Kuacharoen  

E-print Network

}@ece.gatech.edu ABSTRACT As embedded applications become more complex, file I/O operations such as read and write become application includes data inside its program file. For in- stance, a game application may embed data for rendering a scene in the program code. However, as the data becomes larger, embedding the data

Mooney, Vincent

375

Operating System Concepts with Java 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne 2007 Chapter 11: File System Implementation  

E-print Network

Operating System Concepts with Java ­ 7th Edition, Nov 15, 2006 Silberschatz, Galvin and Gagne ©2007 Chapter 11: File System Implementation #12;11.2 Silberschatz, Galvin and Gagne ©2007Operating;11.3 Silberschatz, Galvin and Gagne ©2007Operating System Concepts with Java ­ 7th Edition, Nov 15, 2006 Objectives

Bezrukov, Sergei

376

INTEGRATION OF ADAPTIVE FILE ASSIGNMENT INTO DISTRIBUTED SAFETY-CRITICAL SYSTEMS  

Microsoft Academic Search

Safety-critical systems typically operate in unpredictable environments. Requirements for safety and reliability are in conflict with those for real-time responsiveness. Due to unpredictable environmental needs there is no static trade-off between measures to accommodate the conflicting objectives. Instead every feature or operating system service has to be adaptive.- The distributed operating system MELODY was developed for supporting safety-critical applications under

Horst F. Wedde; Carsten Stange; Jon A. Lind

377

Using LIONS to Transfer Large Files (via FTP) The LIONS system has been available on the University for some time. It is used by the academic community  

E-print Network

Using LIONS to Transfer Large Files (via FTP) The LIONS system has been available on the University for transferring files to and from the University. There are some specific issues with using LIONS FTP that users FTP). However, those directories are not browseable by anyone other than authenticated LIONS users

378

Case Study: Linux ext3 and Journaling In this note, we will study the Linux ext3 file system. The ext3 FS  

E-print Network

32 Case Study: Linux ext3 and Journaling In this note, we will study the Linux ext3 file system to an existing file. For simplic- ity, let's assume we are using a simplified version Linux ext2 [T98], which the first version of the inode (Iv1), it looks like this: 1 #12;2 CASE STUDY: LINUX EXT3 AND JOURNALING

Sheridan, Jennifer

379

July 24, 2012 12:52 WSPC/INSTRUCTION FILE kntuacs12 Advances in Complex Systems  

E-print Network

University matt.knudson@sv.cmu.edu KAGAN TUMER Oregon State University kagan.tumer@oregonstate.edu Received:52 WSPC/INSTRUCTION FILE kntuacs12 2 M. Knudson and K. Tumer improves the process (for example, terrain

Tumer, Kagan

380

Availability and Popularity Measurements of Peer-to-Peer File Systems  

Microsoft Academic Search

Although peer-to-peer networking applications continue to in- crease in popularity, there have been few measurement studies of their performance. We present the first study of the pop- ularity of files stored and transferred among peers in Napste r and Gnutella over month-long periods. Our analysis indicates that the popularity of files is skewed in all four cases and fits well

Jacky Chu; Kevin Labonte; Brian Neil Levine

381

Cognitive and Neuronal Systems Underlying Obesity  

PubMed Central

Since the late 1970’s obesity prevalence and per capita food intake in the USA have increased dramatically. Understanding the mechanisms underlying the hyperphagia that drives obesity requires focus on the cognitive processes and neuronal systems controlling feeding that occurs in the absence of metabolic need (i.e., "non-homeostatic” intake). Given that a portion of the increased caloric intake per capita since the late 1970’s is attributed to increased meal and snack frequency, and given the increased pervasiveness of environmental cues associated with energy dense, yet nutritionally deplete foods, there’s a need to examine the mechanisms through which food-related cues stimulate excessive energy intake. Here, learning and memory principles and their underlying neuronal substrates are discussed with regard to stimulus-driven food intake and excessive energy consumption. Particular focus is given to the hippocampus, a brain structure that utilizes interoceptive cues relevant to energy status (e.g., neurohormonal signals such as leptin) to modulate stimulus-driven food procurement and consumption. This type of hippocampal-dependent modulatory control of feeding behavior is compromised by consumption of foods common to Western diets, including saturated fats and simple carbohydrates. The development of more effective treatments for obesity will benefit from a more complete understanding of the complex interaction between dietary, environmental, cognitive, and neurophysiological mechanisms contributing to excessive food intake. PMID:22266286

Kanoski, Scott E.

2012-01-01

382

49 CFR 1002.2 - Filing fees.  

Code of Federal Regulations, 2012 CFR

...49 U.S.C. 10704(c)(1) 350 (ii) A formal complaint involving rail maximum rates filed under the Simplified-SAC methodology 350 (iii) A formal complaint involving rail maximum rates filed under the Three Benchmark methodology...

2012-10-01

383

Binary Files Reading and Writing Binary Files  

E-print Network

Unit 20 1 File IO · Binary Files · Reading and Writing Binary Files · Writing Objects to files · Reading Objects from files #12;Unit 20 2 Binary Files · Files that are designed to be read by programs to another ­ These files can then be read by a Java program, but only by a Java program #12;Unit 20 3 Writing

Razak, Saquib

384

Operating System Support for Full-Text Search in File Systems  

Microsoft Academic Search

Full-text le system search tools have experi- enced an enormous boom during the last year. While they constitute a great improvement over conventional disk scanning methods, they are still far from being perfect. We present a list of basic requirements, including indexing eciency and disk space consumption, analyze four dier- ent search systems, and show that none of them fullls

Stefan Buttcher; Charles L. A. Clarke

385

Adaptive Media Replication in Unstructured P2P File Sharing Systems Based on Geographical Properties and Query Distributions  

Microsoft Academic Search

Assuring acceptable delivery performance and resource availability is a very relevant issue in P2P networks. We see that replication strategies in P2P file sharing systems are mainly designed to assure high resource hit rate, rather than to improve average delivery throughput. In this paper we present a new replication strategy in an unstructured and decentralized P2P network that, as well

Stefano Leone Monni

2008-01-01

386

Determinants of user acceptance of the e-Government services: The case of online tax filing and payment system  

Microsoft Academic Search

This paper identifies the factors that determine the publics' acceptance of e-Government services. The online tax filing and payment system (OTFPS) is a well-known e-Government service in Taiwan. Using a theoretical model based on the theory of planned behavior, this study aims to (1) identify the determinants for acceptance of the OTFPS; (2) examine the causal relationships among the variables

Shin-Yuan Hung; Chia-Ming Chang; Ting-Jing Yu

2006-01-01

387

Efficient Caching Strategies for Gnutella-Like Systems to Achieve Anonymity in Unstructured P2P File Sharing  

Microsoft Academic Search

A critical problem in a Peer-to-Peer file sharing system is how to protect the anonymity of agent nodes when providing efficient\\u000a data access services. Most of existing technique mostly focus on how to provide the initiator anonymity and privacy, but leave\\u000a the anonymity of the server. Our technique is similar to Onion routing in that it uses a proxy node

Byung Ryong Kim; Ki-chang Kim

2006-01-01

388

Semantically Enriched Information Seeking in Peer-to-Peer File Sharing Systems - Empirical Evidence from the User Perspective  

Microsoft Academic Search

In Peer-to-Peer (P2P) based file sharing systems, keyword-based retrieving is the predominant search functionality. Both, the emergence of semantic web structures and research results on user behavior indicate that in certain circumstances, browsing in semantic networks is not only the more efficient search functionality in specific cases, but also leads to a higher user satisfaction. In this paper, our research

Alexander Benlian; Benedikt Von Walter; Thomas Hess

2005-01-01

389

78 FR 67927 - Foreign Trade Regulations (FTR): Mandatory Automated Export System Filing for All Shipments...  

Federal Register 2010, 2011, 2012, 2013

...collection and the collection of two new data elements in the Automated Export System...approved the collection of two new data elements through the AES under control...required the reporting of two new data elements, license value (15 CFR...

2013-11-13

390

Torsional and cyclic fatigue resistances of glide path preparation instruments: G-file and PathFile.  

PubMed

This study aimed to compare cyclic fatigue and torsional resistances of glide path creating instruments with different tapers and tip sizes. Two sizes (G1 and G2) from G-File system and three sizes (PathFile #1, #2, and #3) from PathFile system were used for torsional resistance and cyclic fatigue resistance tests (n?=?10). The torsional resistance was evaluated at 2-, 3-, 4-, 5-, and 6-mm from the file tip by plotting the torsional load changes until fracture by rotational loading of 2?rpm. The cyclic fatigue resistance was compared by measuring the number of cycles to failure. Data were analyzed statistically using one-way ANOVA and Duncan's post-hoc comparison. The length of the fractured file fragment was also measured. All fractured fragments were observed under a scanning electron microscope (SEM). Although G-2 file showed a lower torsional strength than PathFile #3 at 2- and 3-mm levels (p??0.05). The smaller files of each brand had a significantly higher cyclic fatigue resistance than the bigger ones (p?File #1 and #2 had higher fatigue resistances than G-files (p?File #3, G-2 showed the lowest and PathFile #1 showed the highest resistances among the tested groups (p?

Sung, Sang Yup; Ha, Jung-Hong; Kwak, Sang-Won; Abed, Rashid El; Byeon, Kyeongmin; Kim, Hyeon-Cheol

2014-09-01

391

Research of Efficient C/S Model Based File Transfer Method  

NASA Astrophysics Data System (ADS)

The one-to-multiple file transfer problem has not been solved under the Linux system. In this paper, we take socket programming to accomplish Client/Server model based file transfer system and develop efficient software which not only support multiple clients and files transferring simultaneously, but also support transmission resuming from breakpoint. Our research focuses on solving the multi-thread concurrency, transmission resuming from breakpoint, thread pool, buffer queue and other aspects of problem. Our work is the basic foundation of FTP servers, file transfer software in local area network and large-scale examination system, etc.

Li, Xubin; Zou, Quan; Jiang, Yi

392

CT Teaching Files  

NSDL National Science Digital Library

CTisus is a project of the Advanced Medical Imaging Laboratory, and on this site they present their teaching files. The files are divided by organ or body systems (such as Stomach and Neuro), and each division contains from one to forty-two individual files. Each file contains 100 cases, which allow students to see CT scans, courtesy of Dr. Elliot K. Fishman, and diagnose the illness based on what the scan reveals. By clicking the âÂÂDiagnosisâ on/off buttons, they can see the correct diagnosis. This site will be helpful for students in the fields of diagnostic radiographic imaging or radiology to have an understanding of what diseases look like in CT scans, and for teachers who instruct those students to supplement their classroom lectures and activities with these ready-to-use teaching files.

Fishman, Elliot K.

2007-03-09

393

Multistable systems under the influence of noise  

NASA Astrophysics Data System (ADS)

Nonlinear multistable systems under the influence of noise exhibit a plethora of interesting dynamical properties. A medium noise level causes hopping between the metastable states. This attractorhopping process is characterized through laminar motion in the vicinity of the attractors and erratic motion taking place on chaotic saddles, which are embedded in the fractal basin boundary. This leads to noise-induced chaos. The investigation of the dissipative standard map showed the phenomenon of preference of attractors through the noise. It means, that some attractors get a larger probability of occurrence than in the noisefree system. For a certain noise level this prefernce achieves a maximum. Other attractors are occur less often. For sufficiently high noise they are completely extinguished. The complexity of the hopping process is examined for a model of two coupled logistic maps employing symbolic dynamics. With the variation of a parameter the topological entropy, which is used together with the Shannon entropy as a measure of complexity, rises sharply at a certain value. This increase is explained by a novel saddle merging bifurcation, which is mediated by a snapback repellor. Scaling laws of the average time spend on one of the formerly disconnected parts and of the fractal dimension of the connected saddle describe this bifurcation in more detail. If a chaotic saddle is embedded in the open neighborhood of the basin of attraction of a metastable state, the required escape energy is lowered. This enhancement of noise-induced escape is demonstrated for the Ikeda map, which models a laser system with time-delayed feedback. The result is gained using the theory of quasipotentials. This effect, as well as the two scaling laws for the saddle merging bifurcation, are of experimental relevance. Nichtlineare multistabile Systeme unter dem Einfluss von Rauschen weisen vielschichtige dynamische Eigenschaften auf. Ein mittleres Rauschlevel zeitigt ein Springen zwischen den metastabilen Zustaenden. Dieser “attractor-hopping” Prozess ist gekennzeichnet durch laminare Bewegung in der Naehe von Attraktoren und erratische Bewegung, die sich auf chaotischen Satteln abspielt, welche in die fraktalen Einzugsgebietsgrenzen eingebettet sind. Er hat rauschinduziertes Chaos zur Folge. Bei der Untersuchung der dissipativen Standardabbildung wurde das Phaenomen der Praeferenz von Attraktoren durch die Wirkung des Rauschens gefunden. Dies bedeutet, dass einige Attraktoren eine groessere Wahrscheinlichkeit erhalten aufzutreten, als dies fuer das rauschfreie System der Fall waere. Bei einer bestimmten Rauschstaerke ist diese Bevorzugung maximal. Andere Attraktoren werden aufgrund des Rauschens weniger oft angelaufen. Bei einer entsprechend hohen Rauschstaerke werden sie komplett ausgeloescht. Die Komplexitaet des Sprungprozesses wird fuer das Modell zweier gekoppelter logistischer Abbildungen mit symbolischer Dynamik untersucht. Bei Variation eines Parameters steigt an einem bestimmten Wert des Parameters die topologische Entropie steil an, die neben der Shannon Entropie als Komplexitaetsmass verwendet wird. Dieser Anstieg wird auf eine neuartige Bifurkation von chaotischen Satteln zurueckgefuehrt, die in einem Verschmelzen zweier Sattel besteht und durch einen “Snap-back”-Repellor vermittelt wird. Skalierungsgesetze sowohl der Verweilzeit auf einem der zuvor getrennten Teile des Sattels als auch des Wachsens der fraktalen Dimension des entstandenen Sattels beschreiben diese neuartige Bifurkation genauer. Wenn ein chaotischer Sattel eingebettet in der offenen Umgebung eines Einzugsgebietes eines metastabilen Zustandes liegt, fuehrt das zu einer deutlichen Senkung der Schwelle des rauschinduzierten Tunnelns. Dies wird anhand der Ikeda-Abbildung, die ein Lasersystem mit einer zeitverzoegerden Interferenz beschreibt, demonstriert. Dieses Resultat wird unter Verwendung der Theorie der Quasipotentiale erzielt. Sowohl dieser Effekt, die Senkung der Schwelle für rauschinduziertes Tunneln aus einem metastabilen Zustand durch einen chaotische

Kraut, Suso

2002-04-01

394

Effectiveness of a vocabulary data file, encyclopaedia, and Internet homepages in a conversation?support system for people with moderate?to?severe aphasia  

Microsoft Academic Search

Background: In order to facilitate conversation for people with moderate?to?severe aphasia, a conversation?support system has been developed. This system consists of three electronic resources: a vocabulary data file, an encyclopaedia, and homepages on the Internet. The vocabulary data file we created contains approximately 50,000 words, mostly consisting of various proper names, which are classified into 10 categories. These words function

Kiyoshi Yasuda; Tatsuya Nemoto; Keisuke Takenaka; Mami Mitachi; Kazuhiro Kuwabara

2007-01-01

395

Content awareness in a file system interface: implementing the “pile” metaphor for organizing information  

Microsoft Academic Search

The pile is a new element of the desktop user interface metaphor, designed to support the casual organization of documents. An interface design based on the pile concept suggested uses of content awareness for describing, organizing, and filing textual documents. We describe a prototype implementation of these capabilities, and give a detailed example of how they might appear to the

Daniel E. Rose; Richard Mander; Tim Oren; Dulce B. Poncéleon; Gitta Salomon; Yin Yin Wong

1993-01-01

396

Improving Networked File System Performance Using a Locality-Aware Cooperative Cache Protocol  

Microsoft Academic Search

In a distributed environment, the utilization of file buffer caches in different clients may greatly vary. Cooperative caching has been proposed to increase cache utilization by coordinating the shared usage of distributed caches. It allows clients that would more greatly benefit from larger caches to forward data objects to peer clients with relatively underutilized caches. To support such coordination, global

Song Jiang; Xuechen Zhang; Shuang Liang; Kei Davis

2010-01-01

397

PSON: A Scalable Peer-to-Peer File Sharing System Supporting Complex Queries  

E-print Network

jazz pop rap rock Root games movies music comedyhorror jazz pop rap rock Figure 1: An Example. Shared files have attributes that describe their properties, e.g., singer, composer and title for a music, Philadelphia, PA, USA. Copyright 2005 ACM X-XXXXX-XX-X/XX/XX ...$5.00. Root games movies music comedyhorror

Cui, Jun-Hong

398

1569364319 1 Abstract--Large Peer-to-Peer (P2P) systems for file transfer  

E-print Network

case, the perfor- mance of lookup (i.e., the process of searching for resources) degradesTorrent has many communities that are dedicated to music, movies, Linux distributions, games, etc. Users from the same country tend to access similar resources as well [2]-[3]. For example, for 60% of the files shared

Jayasumana, Anura P.

399

High Performance Block I/O for Global File System (GFS) with InfiniBand RDMA  

E-print Network

Yu Dhabaleswar K. Panda Department of Computer Science and Engineering The Ohio State University Columbus, OH 43210 {liangs,yuw,panda}@cse.ohio-state.edu Abstract State-of-the-art network technology has transfer scheme for GNBD (Global Network Block Device), a block access protocol of Red Hat Global File

Panda, Dhabaleswar K.

400

Enhancing I/O Throughput via Efficient Routing and Placement for Large-scale Parallel File Systems  

SciTech Connect

As storage systems get larger to meet the demands of petascale systems, careful planning must be applied to avoid congestion points and extract the maximum performance. In addition, the large data sets generated by such systems makes it desirable for all compute resources to have common access to this data without needing to copy it to each machine. This paper describes a method of placing I/O close to the storage nodes to minimize contention on Cray s SeaStar2+ network, and extends it to a routed Lustre configuration to gain the same benefits when running against a center-wide file system. Our experiments using half of the resources of Spider the center-wide file system at the Oak Ridge Leadership Computing Facility show that I/O write bandwidth can be improved by up to 45% (from 71.9 to 104 GB/s) for a direct-attached configuration and by 137% (47.6 GB/s to 115 GB/s) for a routed configuration. We demonstrated up to 20.7% reduction in run-time for production scientific applications. With the full Spider system, we demonstrated over 240 GB/s of aggregate bandwidth using our techniques.

Dillow, David A [ORNL] [ORNL; Shipman, Galen M [ORNL] [ORNL; Oral, H Sarp [ORNL] [ORNL; Zhang, Zhe [ORNL] [ORNL; Kim, Youngjae [ORNL] [ORNL

2011-01-01

401

On-Line Inquiry Under a Small-System Operating System  

Microsoft Academic Search

One of themost inconvenient restrictions to the userof a single-partition-orientedoperating capabilities is not having thecomputer available for otherwork during execution of alargeprogram. Many users, however, want facilities that allow the execution of certainprograms at any time. In particular, they are interested in puttingurgentinquiries their data files on disk, without being forced to abort the job in hand. For systems with

Klaus Darga

1970-01-01

402

Consolidated list of chemical subject to reporting under the Emergency Planning and Community Right-to-Know Act: SARA Section 302 extremely hazardous substances, CERCLA hazardous substances and SARA Section 313 toxic chemicals (Title III, list of lists) (for microcomputers). Data file  

SciTech Connect

This is the disk based version of the Office of Toxic Substances Consolidated list of chemicals subject to reporting under Title III of the Superfund Amendments and Reauthorization Act of 1986 (SARA) and SARA Section 302 Extremely Hazardous Substances, as well as CERCLA Hazardous Substances. Title III is also known as the Emergency Planning and Community Right to Know Act. The disks are designed to generate either a printout or a dBase III file from any IBM or IBM compatible system.

Not Available

1991-01-01

403

Consolidated List of chemicals Subject to Reporting Under the Emergency Planning and Community Right to Know Act: SARA Section 302 Extremely Hazardous Substances, CERCLA Hazardous Substances and SARA Section 313 Toxic Chemicals (Title III, list of lists), EZ-Base (trade name) version (for microcomputers). Data file  

SciTech Connect

This is the diskette based version of the Office of Toxic Substances Consolidated List of Chemicals Subject to Reporting Under Title III of the Superfund Amendments and Reauthorization Act of 1986 (SARA) and SARA Section 302 Extremely Hazardous Substances, as well as CERCLA Hazardous Substances. Title III is also known as the Emergency Planning and Community Right to Know Act. The diskette is designed to generate either a printout or a dBase III file from any IBM or IBM compatible system.

Not Available

1992-05-01

404

Efficient algorithms for multi-file caching  

SciTech Connect

Multi-File Caching issues arise in applications where a set of jobs are processed and each job requests one or more input files. A given job can only be started if all its input files are preloaded into a disk cache. Examples of applications where Multi-File caching may be required are scientific data mining, bit-sliced indexes, and analysis of sets of vertically partitioned files. The difference between this type of caching and traditional file caching systems is that in this environment, caching and replacement decisions are made based on ''combinations of files (file bundles),'' rather than single files. In this work we propose new algorithms for Multi-File caching and analyze their performance. Extensive simulations are presented to establish the effectiveness of the Multi-File caching algorithm in terms of job response time and job queue length.

Otoo, Ekow J.; Rotem, Doron; Seshadri, Sridhar

2004-03-15

405

RSX system development under VAX/VMS compatibility mode  

SciTech Connect

The Control System for the Proton Storage Ring now being built at Los Alamos will use a VAX-11/750 as its main control computer with several LSI-11/23 microprocessors reading and controlling the hardware. The VMS Compatibility Mode makes it possible to use the VAX as a development system for the LSI-11/23 microprocessors running the RSX-11S (stand-alone) operating system. Digital Equipment Corporation (DEC)-supplied software is used to generate the RSX-11S operating system and DECNET-11S network software. We use the VMS editors to create source files, the Macro-11 assembler and the PDP-11 Fortran-77 compiler to generate object code, and the RSX Task Builder to link the executable RSX task image. The RSX task then can be tested to some extent on the VAX before it is down-line loaded to the LSI-11/23 for further testing.

Fuka, M.A.

1983-01-01

406

Reliable water supply system design under uncertainty  

Microsoft Academic Search

Given the natural variability and uncertainties in long-term predictions, reliability is a critical design factor for water supply systems. However, the large scale of the problem and the correlated nature of the involved uncertainties result in models that are often intractable. In this paper, we consider a municipal water supply system over a 15-year planning period with initial infrastructure and

G. Chung; K. Lansey; Güzin Bayraksan

2009-01-01

407

Minimax control of switching systems under sampling  

SciTech Connect

We consider a general class of systems subject to two types of uncertainty: a continuous deterministic uncertainty that affects the system dynamics, and a discrete stochastic uncertainty that leads to jumps in the system structure at random times, with the latter described by a continuous-time finite state Markov chain. When only sampled values of the system state is available to the controller, along with perfect measurements on the state of the Markov chain, we obtain a characterization of minimax controllers, which involves the solutions of two finite sets of coupled PDE`s, and a finite dimensional compensator. For the linear-quadratic case, a complete characterization is given in terms of coupled generalized Riccati equations, which also provides the solution to a particular H{infinity} optimal control problem with randomly switching system structure and sampled state measurements.

Basar, T. [Univ. of Illinois, Urbana, IL (United States)

1994-12-31

408

75 FR 80806 - Combined Notice of Filings No. 2  

Federal Register 2010, 2011, 2012, 2013

...Pipeline Rate and Refund Report filings: Docket Numbers: RP10-1232-001. Applicants: Iroquois Gas Transmission System, L.P. Description: Iroquois Gas Transmission System, L.P. submits tariff filing per 154.203: NAESB filing to...

2010-12-23

409

Terminology Extraction from Log Files  

NASA Astrophysics Data System (ADS)

The log files generated by digital systems can be used in management information systems as the source of important information on the condition of systems. However, log files are not exhaustively exploited in order to extract information. The classical methods of information extraction such as terminology extraction methods are irrelevant to this context because of the specific characteristics of log files like their heterogeneous structure, the special vocabulary and the fact that they do not respect a natural language grammar. In this paper, we introduce our approach Exterlog to extract the terminology from log files. We detail how it deals with the particularity of such textual data.

Saneifar, Hassan; Bonniol, Stéphane; Laurent, Anne; Poncelet, Pascal; Roche, Mathieu

410

Passive Decomposition of Multiple Mechanical Systems under Coordination Requirements  

E-print Network

Passive Decomposition of Multiple Mechanical Systems under Coordination Requirements Dongjun Lee interacting with environments and/or humans under coordination requirements. The key innovation is the passive coordination and energetic passivity of the closed- loop system. It decomposes the system dynamics into shape

Lee, Dongjun

411

System architecture analysis and selection under uncertainty  

E-print Network

A system architecture analysis and selection methodology is presented that builds on the Multidisciplinary Analysis and Optimization framework. It addresses a need and opportunity to extend the MAO techniques to include a ...

Smaling, Rudolf M

2005-01-01

412

76 FR 43740 - Self-Regulatory Organizations; NASDAQ OMX BX, Inc.; Notice of Filing of Proposed Rule Change...  

Federal Register 2010, 2011, 2012, 2013

...to file proposed rule changes under Section 19 of...develop or implement changes to its system on the...information regarding planned changes to BOX's systems...use any information advantage it may have...

2011-07-21

413

76 FR 2681 - Amended Environmental Impact Statement Filing System Guidance for Implementing 40 CFR 1506.9 and...  

Federal Register 2010, 2011, 2012, 2013

...the Federal Register; and (6) retention of filed EISs. EPA's current EIS...discs (CDs), USB flash drives, or memory cards. Please note that if a Federal...reduction or extension granted. 7. Retention Filed EISs are retained in the...

2011-01-14

414

26 CFR 53.6081-1 - Automatic extension of time for filing the return to report taxes due under section 4951 for self...  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Automatic extension of time for filing the return...and Administration § 53.6081-1 Automatic extension of time for filing the return...Related Persons,” will be allowed an automatic 6-month extension of time...

2010-04-01

415

29 CFR 15.303 - How does a Job Corps student file a claim for loss of or damages to personal property under the WIA?  

...2014-07-01 2013-07-01 true How does a Job Corps student file a claim for loss of or damages...STATUTES Claims Arising Out of the Operation of the Job Corps § 15.303 How does a Job Corps student file a claim for loss of or...

2014-07-01

416

Invariant characteristics of information systems under some homomorphisms. I  

Microsoft Academic Search

An information system is one of the very important mathematical models in the field of artificial intelligence. The notion of information system's homomorphism as a kind of tools to study the relation between two information systems was introduced by Grzymala-Busse (1986). In this paper, some invariant characteristics of an information system under a homomorphism are discussed

Li Deyu; Chen Qi; Ma Yichen

2000-01-01

417

Scalable I/O Systems via Node-Local Storage: Approaching 1 TB/sec File I/O  

SciTech Connect

The growth in the computational capability of modern supercomputing systems has been accompanied by corresponding increases in CPU count, total RAM, and total storage capacity. Indeed, systems such as Blue-Gene/L [3], BlueGene/P, Ranger, and the Cray XT series have grown to more than 100k processors, with 100 TeraBytes of RAM and are attached to multi-PetaByte storage systems. However, as part of this design evolution, large supercomputers have lost node-local storage elements, such as disks. While this decision was motivated by important considerations like overall system reliability, it also resulted in these systems losing a key level in their memory hierarchy, with nothing to fill the gap between local RAM and the parallel file system. While today's large supercomputers are typically attached to fast parallel file systems, which provide tens of GBs/s of I/O bandwidth, the computational capacity has grown much faster than the storage bandwidth capacity. As such, these machines are now provided with much less than 1GB/s of I/O bandwidth per TeraFlop of compute power, which is below the generally accepted limit required for a well-balanced system [8] [16]. The result is that today's limited I/O bandwidth is choking the capabilities of modern supercomputers, specifically in terms of limiting their working sets and making fault tolerance techniques, such as checkpointing, prohibitively expensive. This paper presents an alternative system design oriented on using node-local storage to improve aggregate system I/O bandwidth. We focus on the checkpointing use-case and present an experimental evaluation of SCR, a new checkpointing library that makes use of node-local storage to significantly improve the performance of checkpointing on large-scale supercomputers. Experiments show that SCR achieves unprecedented write speeds, reaching 700GB/s on 8,752 processors. Our results scale such that we expect a similarly structured system consisting of 12,500 processors to achieve aggregate I/O bandwidth of 1 TB/s.

Moody, A; Bronevetsky, G

2008-05-20

418

On a bicritical system under a fractal signal  

NASA Astrophysics Data System (ADS)

We have studied the behaviour of a coupled bicritical map, under the influence of a fractal signal. An approximate Renormalization Group equation is set up and analysed to extract the Feigenbaum and non-Feigenbaum type scaling indices. The present system can model the case of a discrete system under an external aperiodic force. The change in the behaviour is similar to the phase transition of a thermodynamic system.

Chowdhury, K.; Chowdhury, A. Roy

1994-04-01

419

Scalpel: A Frugal, High Performance File Carver  

E-print Network

­ Independent of file system ­ Works even if file metadata is destroyed 4 #12;1. Introduction (Cont.) 5 A M G E Systems (NTFS, ext2/3) perform disc allocation that minimizes fragmentation ­ However, digitally important;2. File Carving Strategies · FOREMOST 0.69 ­ Performs all carving operations in single pass ­ Find

Almulhem, Ahmad

420

76 FR 79169 - Notice of Filings #1  

Federal Register 2010, 2011, 2012, 2013

...submits tariff filing per 35.13(a)(2)(iii): Great River Energy Agreements to be effective 2/13/ 2012. Filed Date...York Independent System Operator, Inc. Description: Niagara Mohawk and Village of Solvay Cost Reimbursement Agreement no....

2011-12-21

421

75 FR 38805 - Filing Via the Internet; Electronic Tariff Filings Notice of Display of Time on Commission's...  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. RM07-16-000; RM01-5-000] Filing Via the Internet; Electronic Tariff Filings Notice of Display of Time on Commission's Electronic Filing System June 28, 2010. Take...

2010-07-06

422

Improving Hadoop Performance in Handling Small Files  

Microsoft Academic Search

\\u000a Hadoop, created by Doug Cutting, is a top-level Apache project that supports distributed applications which involves thousands\\u000a of nodes and huge amount of data. It is a software framework under a free license, inspired by Google’s MapReduce and Google\\u000a File System papers. It is being developed by a global community of contributors, using Java. Hadoop is used world-wide by\\u000a organizations

Neethu Mohandas; Sabu M. Thampi

423

76 FR 81885 - Airworthiness Directives; Goodrich Evacuation Systems Approved Under Technical Standard Order...  

Federal Register 2010, 2011, 2012, 2013

...Goodrich Evacuation Systems Approved Under Technical Standard Order (TSO...Goodrich Evacuation Systems approved under Technical Standard Order (TSO...Goodrich evacuation systems approved under Technical Standard Order...

2011-12-29

424

Performance of sliding systems under near-fault motions  

Microsoft Academic Search

Response of structures supported on the sliding systems under near-fault earthquake ground motion is investigated. The fault normal and parallel components are applied in two horizontal direction of the system. The superstructure is considered to be rigid and the frictional forces mobilized at the interface of the sliding system are assumed to be velocity dependent. The interaction between frictional forces

P. Bhasker Rao; R. S. Jangid

2001-01-01

425

29 CFR 37.81 - Are there any circumstances under which the Director may extend the time limit for filing a...  

(a) If the recipient does not include in its Notice of Final Action the required notice about the complainant's right to file with the Director, as described in § 37.76(b)(5)(ii); or (b) For other good cause...

2014-07-01

426

Reporting Arezow Doost Filed Under  

E-print Network

Baby monitor, Child Health, Sudden infant death syndrome, United States University of Texas Arlington will directly tell the parent if their child stops breathing. "If anything happens, for instance the baby stops-researchers-patent-sensor-to-combat-sudden-infant... #12;Advertisement 47yr old man discovers "weird" trick to slash electricity bill by 75%. See video

Chiao, Jung-Chih

427

Usage analysis of user files in UNIX  

NASA Technical Reports Server (NTRS)

Presented is a user-oriented analysis of short term file usage in a 4.2 BSD UNIX environment. The key aspect of this analysis is a characterization of users and files, which is a departure from the traditional approach of analyzing file references. Two characterization measures are employed: accesses-per-byte (combining fraction of a file referenced and number of references) and file size. This new approach is shown to distinguish differences in files as well as users, which cam be used in efficient file system design, and in creating realistic test workloads for simulations. A multi-stage gamma distribution is shown to closely model the file usage measures. Even though overall file sharing is small, some files belonging to a bulletin board system are accessed by many users, simultaneously and otherwise. Over 50% of users referenced files owned by other users, and over 80% of all files were involved in such references. Based on the differences in files and users, suggestions to improve the system performance were also made.

Devarakonda, Murthy V.; Iyer, Ravishankar K.

1987-01-01

428

The GIS Files  

NSDL National Science Digital Library

Geographical Information Systems (GIS) are software packages that analyze and classify data for a particular geographical location. This technology has many applications, "from predicting houses in danger of flooding to analysing crime patterns." The GIS Files, operated by Britain's national mapping agency, is a site that gives a good introduction to the basic concepts of GIS. A sequence of seven tutorials explain how the technology came about and how it works. The last chapter provides insight into what might be possible in the future. After looking over the GIS Files, readers should have a reasonable understanding of computer mapping processes and its benefits.

2008-08-25

429

The GIS Files  

NSDL National Science Digital Library

Geographical Information Systems (GIS) are software packages that analyze and classify data for a particular geographical location. This technology has many applications, "from predicting houses in danger of flooding to analysing crime patterns." The GIS Files, operated by Britain's national mapping agency, is a site that gives a good introduction to the basic concepts of GIS. A sequence of seven tutorials explain how the technology came about and how it works. The last chapter provides insight into what might be possible in the future. After looking over the GIS Files, readers should have a reasonable understanding of computer mapping processes and its benefits.

2001-01-01

430

File concepts for parallel I/O  

NASA Technical Reports Server (NTRS)

The subject of input/output (I/O) was often neglected in the design of parallel computer systems, although for many problems I/O rates will limit the speedup attainable. The I/O problem is addressed by considering the role of files in parallel systems. The notion of parallel files is introduced. Parallel files provide for concurrent access by multiple processes, and utilize parallelism in the I/O system to improve performance. Parallel files can also be used conventionally by sequential programs. A set of standard parallel file organizations is proposed, organizations are suggested, using multiple storage devices. Problem areas are also identified and discussed.

Crockett, Thomas W.

1989-01-01

431

Tank waste remediation system year 2000 dedicated file server project HNF-3418 project plan  

SciTech Connect

The Server Project is to ensure that all TWRS supporting hardware (fileservers and workstations) will not cause a system failure because of the BIOS or Operating Systems cannot process Year 2000 dates.

SPENCER, S.G.

1999-04-26

432

Operational readiness of a complex system under priority repair disciplines  

Microsoft Academic Search

Reliability of a complex system under priority repair disciplines viz. head of line, preemptive resume and preemptive repeat\\u000a repair disciplines have been considered. Mathematical models have been developed to find the probability of system being in\\u000a up-state and down-state. Supplementary variable technique and discrete transforms have been used in solving the problem.

A. K. Govil

1970-01-01

433

Wide Area Information Servers: An Executive Information System for Unstructured Files.  

ERIC Educational Resources Information Center

Describes the Wide Area Information Servers (WAIS) system, an integrated information retrieval system for corporate end users. Discussion covers general characteristics of the system, search techniques, protocol development, user interfaces, servers, selective dissemination of information, nontextual data, access to other servers, and description…

Kahle, Brewster; And Others

1992-01-01

434

A file transfer protocol and implementation  

Microsoft Academic Search

This paper presents a file transfer service in a heterogeneous computer network (HMINET). The basic architecture models are presented, the file transfer protocol is described and the implementation in the HMINET is shown with the functional capabilities and the command structure. A transfer of files between different computer system can be regarded as a service, which is divided into four

B. Butscher; W. Heinze

1979-01-01

435

Three-dimensional modeling of supine human and transport system under whole-body vibration.  

PubMed

The development of predictive computer human models in whole-body vibration has shown some success in predicting simple types of motion, mostly for seated positions and in the uniaxial vertical direction. The literature revealed only a handful of papers that tackled supine human modeling in response to vertical vibration. The objective of this work is to develop a predictive, multibody, three-dimensional human model to simulate the supine human and underlying transport system in response to multidirectional whole-body vibration. A three-dimensional dynamic model of a supine human and its underlying transport system is presented in this work to predict supine-human biodynamic response under three-dimensional input random whole-body vibration. The proposed supine-human model consists of three interconnected segments representing the head, torso-arms, and pelvis-legs. The segments are connected via rotational and translational joints that have spring-damper components simulating the three-dimensional muscles and tissuelike connecting elements in the three x, y, and z directions. Two types of transport systems are considered in this work, a rigid support and a long spinal board attached to a standard military litter. The contact surfaces between the supine human and the underlying transport system are modeled using spring-damper components. Eight healthy supine human subjects were tested under combined-axis vibration files with a magnitude of 0.5?m/s2 (rms) and a frequency content of 0.5-16?Hz. The data from seven subjects were used in parameter identification for the dynamic model using optimization schemes in the frequency domain that minimize the differences between the magnitude and phase of the predicted and experimental transmissibility. The predicted accelerations in the time and frequency domains were comparable to those gathered from experiments under different anthropometric, input vibration, and transport conditions under investigation. Based on the results, the proposed dynamic model has the potential to be used to provide motion data to drive a detailed finite element model of a supine human for further investigation of muscle forces and joint dynamics. The predicted kinematics of the supine human and transport system would also benefit patient safety planners and vibration suppression designers in their endeavors. PMID:23699722

Wang, Yang; Rahmatalla, Salam

2013-06-01

436

GIGA+ : Scalable Directories for Shared File Systems Swapnil Patil Garth Gibson  

E-print Network

experiments at Los Alamos National Lab. Aditya Jayaraman, Sanket Hase, Vinay Perneti and Sundar Sundaraman Data Storage Institute (PDSI) and by the Los Alamos National Lab under Award Number 54515.patil, garth.gibson} @ cs.cmu.edu CMU-PDL-08-110 October 2008 Parallel Data Laboratory Carnegie Mellon

437

Modeling of 2-chloronaphthalene interaction with high carbon iron filings (HCIF) in semi-batch and continuous systems.  

PubMed

Unrusted high carbon iron filings (HCIF) were contacted sequentially with successive aliquots of aqueous 2-chloronaphthalene (2-CN), i.e., in semi-batch mode, both in well-mixed and poorly-mixed conditions. Aqueous concentration of 2-CN and the dehalogenation by-product naphthalene (N) were monitored at the beginning and end of each 2-CN addition cycle. Experimental data was modeled using the 2-CN dehalogenation and adsorption/desorption rate constants determined from batch experiments involving 2-CN and a similar HCIF sample. Model predictions for the semi-batch experiments matched quite well with the experimental data in both well-mixed and poorly-mixed cases. Further, it was experimentally demonstrated that adsorption and hence accumulation of N on HCIF surface did not substantially hinder either 2-CN adsorption or dehalogenation under the conditions examined in this study. Continuous transport of water containing 0.5 ?mol L(-1) 2-CN through a 1.0-m thick unrusted HCIF layer was simulated at superficial velocities of 0.01 and 0.10 m h(-1). Both simulations indicated nearly complete removal of 2-CN in the HCIF layer. This study suggests that HCIF can be used as a potential reactive material in permeable reactive barriers (PRBs) for in situ remediation of groundwater contaminated with 2-CN. PMID:24764006

Sinha, Alok; Bose, Purnendu

2014-09-01

438

A Usage Profile and Evaluation of a Wide-Area Distributed File System  

E-print Network

to a questionnaire. Our observations indicate that AFS provides robust and efficient data access in its current of the system, and from user responses to a questionnaire. Our observations indicate that AFS provides robust. Today, virtually every organization with a large collection of personal machines uses such a system

Satyanarayanan, Mahadev "Satya"

439

Development of high gradient magnetic separation system under dry condition  

NASA Astrophysics Data System (ADS)

The interfusion of impurities such as metallic wear debris has been a problem in the manufacturing process of foods, medicines, and industrial products. Gravity separation system and membrane separation system has been used widely for powder separation, however magnetic separation system is much efficient to separate magnetic particles. Magnetic separation system under wet process is used conventionally, however, it has some demerit such as necessity of drying treatment after separation and difficulty of running the system in the cold region and so on. Thus, magnetic separation under dry process is prospective as alternative method. In this paper, we developed high gradient magnetic separation system (HGMS) under dry process. In dry HGMS system, powder coagulation caused by particle interaction is considerable. Powder coagulation causes a blockage of magnetic filters and results in decrease of separation performance of dry HGMS system. In order to investigate the effect of powder coagulation on separation performance, we conducted experiments with two kinds of powdered materials whose cohesive properties are different.

Nakai, Y.; Mishima, F.; Akiyama, Y.; Nishijima, S.

2010-11-01

440

Spectrum Sharing in Cognitive Radio Systems Under Outage Probablility Constraint  

E-print Network

SPECTRUM SHARING IN COGNITIVE RADIO SYSTEMS UNDER OUTAGE PROBABILITY CONSTRAINT A Thesis by PEI LI CAI Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE... December 2009 Major Subject: Electrical Engineering SPECTRUM SHARING IN COGNITIVE RADIO SYSTEMS UNDER OUTAGE PROBABILITY CONSTRAINT A Thesis by PEI LI CAI Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment...

Cai, Pei Li

2011-02-22

441

Efficient diagnosis of multiprocessor systems under probabilistic models  

NASA Technical Reports Server (NTRS)

The problem of fault diagnosis in multiprocessor systems is considered under a probabilistic fault model. The focus is on minimizing the number of tests that must be conducted in order to correctly diagnose the state of every processor in the system with high probability. A diagnosis algorithm that can correctly diagnose the state of every processor with probability approaching one in a class of systems performing slightly greater than a linear number of tests is presented. A nearly matching lower bound on the number of tests required to achieve correct diagnosis in arbitrary systems is also proven. Lower and upper bounds on the number of tests required for regular systems are also presented. A class of regular systems which includes hypercubes is shown to be correctly diagnosable with high probability. In all cases, the number of tests required under this probabilistic model is shown to be significantly less than under a bounded-size fault set model. Because the number of tests that must be conducted is a measure of the diagnosis overhead, these results represent a dramatic improvement in the performance of system-level diagnosis techniques.

Blough, Douglas M.; Sullivan, Gregory F.; Masson, Gerald M.

1989-01-01

442

Integrating digital teaching-file systems with off-the-shelf presentation software to facilitate speaker-led conferences  

Microsoft Academic Search

Objective: Develop methods for automated transfer of images and associated text from a teaching-file repository into presentation material\\u000a for speaker-led conferences.erials\\/Methods:Our institution uses a Microsoft Windows (Microsoft Corp, Redmond, WA) software application to maintain a digital teaching-file\\u000a database that can store and retrieve content in a case-centric fashion. Virtually any number of images can be stored with\\u000a any given case.

Mark S. Frank; Thomas Schultz; Keith Dreyer

2001-01-01

443

Harmonic current emission of photovoltaic installations under system conditions  

Microsoft Academic Search

Harmonic currents of PV-inverters show a significant dependency on the harmonic voltage content of the AC-system voltage. Measurements of harmonic currents were carried out in LV-systems and under laboratory test conditions with adjustable harmonic content of the AV-voltage. Two PV-inverters, one with coupling transformer and one without transformer were tested. The results indicated that the emitted harmonic currents depend strongly

J. Schlabbach

2008-01-01

444

Spectrally Efficient Frequency Hopping System Design under Hostile Jamming  

Microsoft Academic Search

This paper considers spectrally efficient anti-jamming system design based on message-driven frequency hopping (MDFH). As\\u000a a highly efficient frequency hopping scheme, MDFH is particularly robust under strong jamming. However, disguised jamming\\u000a from sources of similar power strength can cause performance losses. To overcome this drawback, in this paper, we first propose\\u000a an anti-jamming MDFH (AJ-MDFH) system. The main idea is

Lei Zhang; Tongtong Li

2009-01-01

445

Stimulating User Participation in a File-Sharing P2P System Supporting University Classes  

E-print Network

URLs of class-related resources, like academic and popular articles. The system has been deployed students. We deployed two motivational strategies to encourage users to contribute resources of peers. They have been used for sharing music, video-clips, movies and games and due to copyright issues

Vassileva, Julita

446

Using the IPEDS Peer Analysis System in Peer Group Selection. Professional File Number 110, Winter 2008  

ERIC Educational Resources Information Center

Compared to traditional classification methods, developing a peer group using the National Center for Educational Statistics (NCES) Integrated Postsecondary Education Data Systems (IPEDS) data allows institutions to add comparative dimensions, to update the peer group, and to track changes at peer institutions over time. Peer selection and…

Xu, Juan

2008-01-01

447

Semi-join computation on distributed file systems using map-reduce-merge model  

Microsoft Academic Search

Semi-join is the most used technique to optimize the treatment of complex relational queries on distributed architectures. However, the overhead related to semi-join computation can be very high due to data skew and to the high cost of communication in distributed architectures. Internet search engines needs to process vast amounts of raw data every day. Hence, systems that manage such

Mohamad Al Hajj Hassan; Mostafa Bamha

2010-01-01

448

Macro-modeling and energy efficiency studies of file management in embedded systems with flash memory  

E-print Network

and feature-rich embedded devices are strictly limited by their battery life- time. Embedded systems typically are diskless and use flash for secondary storage due to their low power, persistent storage and small form factor needs. The energy efficiency of a...

Goyal, Nitesh

2006-08-16

449

Qualitative analysis of files of four different rotary systems, before and after being used for the twelfth time.  

PubMed

The aim of this study was to make a comparative evaluation of the surface topography of the cervical third and tip of four different rotary systems, before and after being used 12 times, in resin blocks with simulated root canals with standardized 45° curvatures, and analyzed by scanning electronic microscopy (SEM). A total of 1,440 resin blocks with simulated root canals and standardized curvatures were used. The blocks were divided into four groups and prepared by the crown down technique according to the manufacturers' recommendations: Group 1 (G1)--K3®, Group 2 (G2)--Protaper Universal®, Group 3 (G3)--Twisted Files®, and Group 4 (G4)--Biorace®. After each preparation, the instruments were washed and autoclaved. A total of 24 instruments were selected, being three new instruments and three after having been used for the 12th time, from each group. These instruments were analyzed by SEM. To perform the evaluation, 24 micrographs were observed by 12 evaluators who attributed a score to the images according to a template. In the qualitative analysis of the cervical region and tip of new instruments, it was observe that the files of Groups G4 and G2 were the least rough and those of G1, the roughest. In the same manner, the cervical region of the instruments was qualitatively analyzed after the 12th time of using them, and there was no statistically significant difference at a level of 1% (ANOVA P < 0.01) between G2 and G4 as well as between G1 and G3. As regards the tip, it was observed that there was no statistically significant difference, at a level of 1%, between the groups: G1 and G3, G1 and G4, and between G3 and G4, and there was statistically significant difference at a level of 1%, between group G2 and the other groups, with G3 having the greatest roughness (ANOVA P < 0.01). PMID:23108940

Yamazaki-Arasaki, Andréa Kanako; Cabrales, Ricardo Júlio Salgado; Kleine, Brígida Mônica; Araki, Angela Toshie; Dos Santos, Marcelo; Prokopowitsch, Igor

2013-01-01

450

Evaluation of Forces Generated on Three Different Rotary File Systems in Apical Third of Root Canal using Finite Element Analysis  

PubMed Central

Aim: Aim of the study is to evaluate the distribution of forces on the instrument in the apical 3rd of curved canal with three Nickel Titanium rotary systems. Methodology: Three brands of instruments (ProTaper Universal; DENTSPLY Maillefer, RevoS; MicroMega and Hyflex; Coltene-Whaledent, Allstetten, Switzerland) were scanned with the Laser assisted computerized scanner to produce a real-size, 3-dimensional (3-D) model for each. The stresses on the instrument during simulated shaping of a root canal were analyzed numerically by using a 3-D finite element package, taking into account the nonlinear mechanical behavior of the nickel-titanium material. Results: RevoS shows lowest values for force generation in the apical 3rd of canal as compared to Protaper which shows highest values, while Hyflex shows intermediate values for forces. Conclusion: With FE simulation of root canal shaping by 3 files, it was observed that different instrument designs would experience unequal degree of force generation in canal, as well as reaction torque from the root canal wall. PMID:24596786

Medha, Ashish; Patil, Suvarna; Hoshing, Upendra; Bandekar, Siddhesh

2014-01-01

451

Failure of thermal barrier coating systems under cyclic thermomechanical loading  

Microsoft Academic Search

The failure mechanisms of thermal barrier coating (TBC) systems applied on gas turbine blades and vanes are investigated using thermomechanical fatigue (TMF) tests and finite element (FE) modeling. TMF tests were performed at two levels of applied mechanical strain, namely five times and three times the critical in-service mechanical strain of an industrial gas turbine. TMF testing under the higher

E Tzimas; H Müllejans; S. D Peteves; J Bressers; W Stamm

2000-01-01

452

Making resonance a common case: a high-performance implementation of collective I/O on parallel file systems  

SciTech Connect

Collective I/O is a widely used technique to improve I/O performance in parallel computing. It can be implemented as a client-based or server-based scheme. The client-based implementation is more widely adopted in MPI-IO software such as ROMIO because of its independence from the storage system configuration and its greater portability. However, existing implementations of client-side collective I/O do not take into account the actual pattern offile striping over multiple I/O nodes in the storage system. This can cause a significant number of requests for non-sequential data at I/O nodes, substantially degrading I/O performance. Investigating the surprisingly high I/O throughput achieved when there is an accidental match between a particular request pattern and the data striping pattern on the I/O nodes, we reveal the resonance phenomenon as the cause. Exploiting readily available information on data striping from the metadata server in popular file systems such as PVFS2 and Lustre, we design a new collective I/O implementation technique, resonant I/O, that makes resonance a common case. Resonant I/O rearranges requests from multiple MPI processes to transform non-sequential data accesses on I/O nodes into sequential accesses, significantly improving I/O performance without compromising the independence ofa client-based implementation. We have implemented our design in ROMIO. Our experimental results show that the scheme can increase I/O throughput for some commonly used parallel I/O benchmarks such as mpi-io-test and ior-mpi-io over the existing implementation of ROMIO by up to 157%, with no scenario demonstrating significantly decreased performance.

Davis, Marion Kei [Los Alamos National Laboratory; Zhang, Xuechen [WAYNE STATE UNIV; Jiang, Song [WAYNE STATE UNIV

2009-01-01

453

Migration of processes, files, and virtual devices in the MDX operating system  

Microsoft Academic Search

Load management in distributed systems is usually focused on balancing process execution and communication load. Stress on storage media and I\\/O-devices is considered only indirectly or disregarded. For I\\/O-intensive processes this imposes severe restrictions on balancing algorithms: processes have to be placed relative to fixed allocated resources. Therefore, beyond process migration, there is a need for a migration of all

Harald Schrimpf

1995-01-01

454

Symmetric Active/Active Metadata Service for High Availability Parallel File Systems  

SciTech Connect

High availability data storage systems are critical for many applications as research and business become more data-driven. Since metadata management is essential to system availability, multiple metadata services are used to improve the availability of distributed storage systems. Past research focused on the active/standby model, where each active service has at least one redundant idle backup. However, interruption of service and even some loss of service state may occur during a fail-over depending on the used replication technique. In addition, the replication overhead for multiple metadata services can be very high. The research in this paper targets the symmetric active/active replication model, which uses multiple redundant service nodes running in virtual synchrony. In this model, service node failures do not cause a fail-over to a backup and there is no disruption of service or loss of service state. We further discuss a fast delivery protocol to reduce the latency of the needed total order broadcast. Our prototype implementation shows that metadata service high availability can be achieved with an acceptable performance trade-off using our symmetric active/active metadata service solution.

He, X. [Tennessee Technological University; Ou, Li [Tennessee Technological University; Engelmann, Christian [ORNL; Chen, Xin [Tennessee Technological University; Scott, Stephen L [ORNL

2009-01-01

455

29 CFR 102.119 - Privacy Act Regulations: notification as to whether a system of records contains records...  

Code of Federal Regulations, 2010 CFR

...litigation, and any other investigatory material compiled for law enforcement purposes; (2) the Solicitor's System (SOL) and Associated Headquarters Files (NLRB-23)—information relating to requests to file injunctions under 29...

2010-07-01

456

29 CFR 102.119 - Privacy Act Regulations: notification as to whether a system of records contains records...  

Code of Federal Regulations, 2011 CFR

...litigation, and any other investigatory material compiled for law enforcement purposes; (2) the Solicitor's System (SOL) and Associated Headquarters Files (NLRB-23)—information relating to requests to file injunctions under 29...

2011-07-01

457

Monetizing Benefits Under Alternative River Recreation Use Allocation Systems  

NASA Astrophysics Data System (ADS)

An optimal capacity, when the binding use constraint is ecological damage, and monetization of recreational benefits, under alternative means of rationing that capacity, were conceptually and empirically developed. The model was developed by first estimating the demand to float Westwater Canyon, derived from a modified travel cost model. Recreational benefits of 6,500 under a hypothetical capacity of 50 trips, when pricing was used to allocate the permits, and a range of benefits from as low as 880 to an expected value of $3,690, if a lottery system is used, were estimated using this model. The monetization of the efficiency losses associated with more equitable allocation systems allows managers to be more objective in making the equity-efficiency trade-offs involved in picking a recreation use allocation system.

Loomis, John B.

1980-02-01

458

Plutus: Scalable Secure File Sharing on Untrusted Storage  

Microsoft Academic Search

Plutus is a cryptographic storage system that enables se- cure file sharing without placing much trust on the file servers. In particular, it makes novel use of cryptographic primitives to protect and share files. Plutus features highly scalable key management while allowing individual users to retain direct control over who gets access to their files. We explain the mechanisms in

Mahesh Kallahalla; Erik Riedel; Ram Swaminathan; Qian Wang; Kevin Fu

2003-01-01

459

Impacts of Control and Communication System Vulnerabilities on Power Systems Under  

E-print Network

1 Impacts of Control and Communication System Vulnerabilities on Power Systems Under Contingencies, NM, USA Abstract--Modern power grids rely heavily on their control systems operating over. Index Terms--Power system control, power system communi- cation, vulnerabilities, cascading failures

Hayat, Majeed M.

460

Red Files  

NSDL National Science Digital Library

Red Files, a four-part documentary series from PBS, utilizes previously unavailable archival sources and interviews to present a fascinating look at the Soviet Union and its Cold War rivalry with the US. This attractive companion site offers a number of resources related to each of the four episodes: Secret Victories of the KGB, Soviet Sports Wars, Secret Soviet Moon Mission, and Soviet Propaganda. For each installment, users will find a story synopsis, the Producer's script, theme music, updates on related events, human interest stories, complete interview transcripts, video clips, a reference section, access to related sections of Russian Archives Online, maps, a timeline, lesson plans, and more. Additional offerings include a collection of links mentioned in the series and an internal search engine. This site joins an already strong tradition at PBS of creating sites that are actual companions to the program, offering new and expanded content for interested users.

461

Analysis of Long Term File Reference Patterns for Application to File Migration Algorithms  

Microsoft Academic Search

In most large computer installations files are moved between on-line disk and mass storage (tape, integrated mass storage device) either automatically by the system and\\/or at the direction of the user. In this paper we present and analyze long term file reference data in order to develop a basis for the construction of algorithms for file migration. Specifically, we examine

Alan Jay Smith

1981-01-01

462

12 CFR 1102.23 - Formal requirements as to papers filed.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Formal requirements as to papers filed. 1102.23 Section 1102.23 Banks...Proceedings § 1102.23 Formal requirements as to papers filed. (a) Form. All papers filed under this subpart must be...

2010-01-01

463

20 CFR 30.101 - In general, how is a survivor's claim filed?  

Code of Federal Regulations, 2013 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.101 In general, how is a survivor's claim filed?...

2013-04-01

464

20 CFR 30.101 - In general, how is a survivor's claim filed?  

Code of Federal Regulations, 2011 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.101 In general, how is a survivor's claim filed?...

2011-04-01

465

20 CFR 30.101 - In general, how is a survivor's claim filed?  

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.101 In general, how is a survivor's claim filed?...

2014-04-01

466

20 CFR 30.101 - In general, how is a survivor's claim filed?  

Code of Federal Regulations, 2012 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.101 In general, how is a survivor's claim filed?...

2012-04-01

467

20 CFR 30.101 - In general, how is a survivor's claim filed?  

Code of Federal Regulations, 2010 CFR

...COMPENSATION PROGRAM ACT OF 2000, AS AMENDED Filing Claims; Evidence and Burden of Proof; Special Procedures for Certain Cancer Claims Filing Claims for Benefits Under Eeoicpa § 30.101 In general, how is a survivor's claim filed?...

2010-04-01

468

43 CFR 45.12 - Where and how must documents be filed?  

Code of Federal Regulations, 2012 CFR

...to supplement any filing by providing the appropriate office with an electronic copy of the document on diskette or compact disc. (c) Date of filing. A document under this subpart is considered filed on the date it is received....

2012-10-01

469

Evaluation and Analysis of GreenHDFS: A Self-Adaptive, Energy-Conserving Variant of the Hadoop Distributed File System  

Microsoft Academic Search

We present a detailed evaluation and sensitivity analysis of an energy-conserving, highly scalable variant of the Hadoop Distributed File System (HDFS) called Green-HDFS. Green HDFS logically divides the servers in a Hadoop cluster into Hot and Cold Zones and relies on insightful data-classification driven energy-conserving data placement to realize guaranteed, substantially long periods(several days) of idleness in a significant subset

Rini T. Kaushik; Milind A. Bhandarkar; Klara Nahrstedt

2010-01-01

470

Scientific processor vector file organization  

SciTech Connect

This patent describes in a scientific vector processor having multiple independent instruction execution pipelines, a vector file memory system. It comprises: a first vector file means for addressable storing a plurality of vector files made up of vector elements in a predetermined storage configuration and a second equal vector file means for addressably storing a second plurality of vector files made up of vector elements in the predetermined storage configuration. Each of the first and second vector file means including an identical plurality of N memory blocks, wherein each of the memory blocks comprises a random access memory means having storage locations for storing vector elements, addressing means for providing address signals for addressing the storage locations, and a separate writing means for writing vector elements in addressed ones of the storage locations. Each of the random access memory means including a plurality of successive addressable storage locations wherein each such successive location stores contiguous information successively separated by N locations, where N equals the number of the N memory blocks; N address registers; and a time slot management mechanism coupled to each of the vector file means to allocate and maintain memory access.

Lahti, A.E.

1989-10-17

471

27 CFR 31.172 - Place of filing.  

Code of Federal Regulations, 2010 CFR

...ALCOHOL BEVERAGE DEALERS Records and Reports Filing of Wholesale Dealers' Records and Reports § 31.172 Place of filing...at another business location under the control of the same wholesale dealer, when it is determined that such maintenance...

2010-04-01

472

48 CFR 4.802 - Contract files.  

Code of Federal Regulations, 2011 CFR

...Federal Acquisition Regulations System 1 2011-10-01 2011-10-01...Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION...files or file segments are decentralized (e.g., by type or function...and, if needed, a locator system should be established to...

2011-10-01

473

48 CFR 4.802 - Contract files.  

Code of Federal Regulations, 2010 CFR

...Federal Acquisition Regulations System 1 2010-10-01 2010-10-01...Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION...files or file segments are decentralized (e.g., by type or function...and, if needed, a locator system should be established to...

2010-10-01

474

75 FR 58340 - Airworthiness Directives; Koito Industries, Ltd., Seats and Seating Systems Approved Under...  

Federal Register 2010, 2011, 2012, 2013

...Seats and Seating Systems Approved Under Technical Standard Order...seats and seating systems having a model...approved under technical standard order...seats and seating systems having any model...approved under Technical Standard...

2010-09-24

475

Modeling Municipal Solid Waste Management System under Uncertainty  

Microsoft Academic Search

In this study, a dynamic inexact waste management (DIWM) model is developed for identifying optimal waste-flow-allocation and facility-capacity-expansion strategies under uncertainty and is based on an inexact scenario-based probabilistic programming (ISPP) approach. The DIWM model can handle uncertainties presented as interval values and probability distributions, and it can support assessing the risk of violating system constraints. Several violation levels for

Yongping Li; Guohe Huang; Fabio Lopes; Glauber Mariano; Ani Torres; Wellington Jesus; Walter Nakaema; Maria Jorge; Rauda Mariani; Klara Slezakova; Dionísia Castro; Maria Pereira; Simone Morais; Cristina Delerue-Matos; Maria Alvim-Ferraz; Catherine Barton; Charles Zarzecki; Mark Russell; Marjaleena Aatamila; Pia Verkasalo; Maarit Korhonen; Marja Viluksela; Kari Pasanen; Pekka Tiittanen; Aino Nevalainen; Li Rong; Peter Nielsen; Guoqiang Zhang; Yi-Ming Kuo; Juu-En Chang; Kun-Yu Chang; Chih-C. Chao; Yeu-Juin Tuan; Guo-Ping Chang-Chien; Arhontoula Chatzilazarou; Evangelos Katsoyannos; Olga Gortzi; Stavros Lalas; Yiannis Paraskevopoulos; Euthalia Dourtoglou; John Tsaknis; Tarek Abichou; Jeremy Clark; Sze Tan; Jeffery Chanton; Gary Hater; Roger Green; Doug Goldsmith; Morton Barlaz; Nathan Swan; Gang Sun; Huiqing Guo; Jonathan Peterson; Zhengmin Qian; Hung-Mo Lin; Walter Stewart; Nirav Shah; Linli Kong; Fen Xu; Denjin Zhou; Zhicao Zhu; Qingci He; Shengwen Liang; Weiqing Chen; Chungsying Lu; Hsunling Bai; Fengsheng Su; Wenfa Chen; Jyh Hwang; Hsiu-Hsia Lee; Judith Chow; John Watson; Douglas Lowenthal; Lung-Wen Chen; Nehzat Motallebi

2010-01-01

476

Robust Control of Immune Systems Under Noises: Stochastic Game Approach  

Microsoft Academic Search

\\u000a A robust control of immune response is proposed for therapeutic en- hancement to match a prescribed immune response under\\u000a uncertain initial states and environmental noises, including continuous intrusion of exogenous pathogens. The worst-case effect\\u000a of all possible noises and uncertain initial states on the matching for a desired immune response is minimized for the enhanced\\u000a immune system, i.e., a robust

Bor-Sen Chen; Chia-Hung Chang; Yung-Jen Chuang

477

Nonlinear system identification of smart structures under high impact loads  

NASA Astrophysics Data System (ADS)

The main purpose of this paper is to develop numerical models for the prediction and analysis of the highly nonlinear behavior of integrated structure control systems subjected to high impact loading. A time-delayed adaptive neuro-fuzzy inference system (TANFIS) is proposed for modeling of the complex nonlinear behavior of smart structures equipped with magnetorheological (MR) dampers under high impact forces. Experimental studies are performed to generate sets of input and output data for training and validation of the TANFIS models. The high impact load and current signals are used as the input disturbance and control signals while the displacement and acceleration responses from the structure-MR damper system are used as the output signals. The benchmark adaptive neuro-fuzzy inference system (ANFIS) is used as a baseline. Comparisons of the trained TANFIS models with experimental results demonstrate that the TANFIS modeling framework is an effective way to capture nonlinear behavior of integrated structure-MR damper systems under high impact loading. In addition, the performance of the TANFIS model is much better than that of ANFIS in both the training and the validation processes.

Sarp Arsava, Kemal; Kim, Yeesock; El-Korchi, Tahar; Park, Hyo Seon

2013-05-01

478

Design, implementation, and benchmarking of a file manager for a relational database management system on a raw UNIX disk  

E-print Network

-physical mapping of files to their disk blocks. The proposal for our design was influenced by a, database research group at Texas ASM University that was involved in surveying recovery techniques for databases running on a client-server platform. A database...-physical mapping of files to their disk blocks. The proposal for our design was influenced by a, database research group at Texas ASM University that was involved in surveying recovery techniques for databases running on a client-server platform. A database...

Narayanan, Pudugramam Shanker

2012-06-07

479

76 FR 6778 - Combined Notice of Filings No. 2  

Federal Register 2010, 2011, 2012, 2013

...Pipeline Rate and Refund Report filings: Docket Numbers: RP10-1232-003. Applicants: Iroquois Gas Transmission System, L.P. Description: Iroquois Gas Transmission System, L.P. submits tariff filing per 154.203: 01/31/11...

2011-02-08

480

75 FR 70229 - Combined Notice of Filings No. 1  

Federal Register 2010, 2011, 2012, 2013

...Pipeline Rate and Refund Report filings: Docket Numbers: RP11-1498-000. Applicants: Iroquois Gas Transmission System, L.P. Description: Iroquois Gas Transmission System, L.P., submits tariff filing per 154.204: 11/04/10...

2010-11-17

481

Bit Transposed Files  

Microsoft Academic Search

Introduction and Motivation Conventional access methods cannot be effectively used in large Scientific\\/Statistical Database (SSDB) applications. A file structure (called bit tran- sposed file) is proposed which offers several attractive features that are better suited for the special charac- teristics that SSDBs exhibit. This file structure is an extreme version of the (attribute) transposed file. The data is stored by

Harry K. T. Wong; Hsiu-fen Liu; Frank Olken; Doron Rotem; Linda Wong

1985-01-01

482

Comparison of the shaping ability of GT® Series X, Twisted Files and AlphaKite rotary nickel-titanium systems in simulated canals  

PubMed Central

Background Efforts to improve the performance of rotary NiTi instruments by enhancing the properties of NiTi alloy, or their manufacturing processes rather than changes in instrument geometries have been reported. The aim of this study was to compare in-vitro the shaping ability of three different rotary nickel-titanium instruments produced by different manufacturing methods. Methods Thirty simulated root canals with a curvature of 35? in resin blocks were prepared with three different rotary NiTi systems: AK- AlphaKite (Gebr. Brasseler, Germany), GTX- GT® Series X (Dentsply, Germany) and TF- Twisted Files (SybronEndo, USA). The canals were prepared according to the manufacturers’ instructions. Pre- and post-instrumentation images were recorded and assessment of canal curvature modifications was carried out with an image analysis program (GSA, Germany). The preparation time and incidence of procedural errors were recorded. Instruments were evaluated under a microscope with 15?×?magnifications (Carl Zeiss OPMI Pro Ergo, Germany) for signs of deformation. The Data were statistically analyzed using SPSS (Wilcoxon and Mann–Whitney U-tests, at a confidence interval of 95%). Results Less canal transportation was produced by TF apically, although the difference among the groups was not statistically significant. GTX removed the greatest amount of resin from the middle and coronal parts of the canal and the difference among the groups was statistically significant (p?Under the conditions of this study, all rotary NiTi instruments maintained the working length and prepared a well-shaped root canal. The least canal transportation was produced by AK. GTX displayed the greatest cutting efficiency. TF prepared the canals faster than the other two systems. PMID:24341354

2013-01-01

483

A robotic assistant system for cardiac interventions under MRI guidance  

NASA Astrophysics Data System (ADS)

In this paper we present a surgical assistant system for implanting prosthetic aortic valve transapically under MRI guidance, in a beating heart. The system integrates an MR imaging system, a robotic system, as well as user interfaces for a surgeon to plan the procedure and manipulate the robot. A compact robotic delivery module mounted on a robotic arm is used for delivering both balloon-expandable and self-expanding prosthesis. The system provides different user interfaces at different stages of the procedure. A compact fiducial pattern close to the volume of interest is proposed for robot registration. The image processing and the transformation recovery methods using this fiducial in MRI are presented. The registration accuracy obtained by using this compact fiducial is comparable to the larger multi-spherical marker registration method. The registration accuracy using these two methods is less than 0.62+/-0.50 deg (mean +/- std. dev.) and 0.63+/-0.72 deg (mean +/- std. dev.), respectively. We evaluated each of the components and show that they can work together to form a complete system for transapical aortic valve replacement.

Li, Ming; Mazilu, Dumitru; Wood, Bradford J.; Horvath, Keith A.; Kapoor, Ankur

2010-02-01

484

The deep hydrogeologic flow system underlying the Oak Ridge Reservation  

SciTech Connect

The deep hydrogeologic system underlying the Oak Ridge Reservation contains some areas contaminated with radionuclides, heavy metals, nitrates, and organic compounds. The groundwater at that depth is saline and has previously been considered stagnant. On the basis of existing and newly collected data, the nature of flow of the saline groundwater and its potential discharge into shallow, freshwater systems was assessed. Data used for this purpose included (1) spatial and temporal pressures and hydraulic heads measured in the deep system, (2) hydraulic parameters of the formations in question, (3) spatial temperature variations, and (4) spatial and temporal chemical and isotopic composition of the saline groundwater. In addition, chemical analyses of brine in adjacent areas in Tennessee, Kentucky, Ohio, Pennsylvania, and West Virginia were compared with the deep water underlying the reservation to help assess the origin of the brine. Preliminary conclusions suggest that the saline water contained at depth is old but not isolated (in terms of recharge and discharge) from the overlying active and freshwater-bearing units. The confined water (along with dissolved solutes) moves along open fractures (or man-made shortcuts) at relatively high velocity into adjacent, more permeable units. Groundwater volumes involved in this flow probably are small.

Nativ, R. [Hebrew Univ., Jerusalem (IL); Hunley, A.E. [Oak Ridge National Lab., TN (United States)

1993-07-01

485

Sorted pulse data (SPD) library. Part I: A generic file format for LiDAR data from pulsed laser systems in terrestrial environments  

NASA Astrophysics Data System (ADS)

The management and spatial-temporal integration of LiDAR data from different sensors and platforms has been impeded by a lack of generic open source tools and standards. This paper presents a new generic file format description (sorted pulse data; SPD) for the storage and processing of airborne and terrestrial LiDAR data. The format is designed specifically to support both traditional discrete return and waveform data, using a pulse (rather than point) based data model. The SPD format also supports 2D spatial indexing of the pulses, where pulses can be referenced using cartesian, spherical, polar or scan geometry coordinate systems and projections. These indexes can be used to significantly speed up data processing whilst allowing the data to be appropriately projected and are particularly useful when analysing and interpreting TLS data. The format is defined within a HDF5 file, which provides a number of benefits including broad support across a wide range of platforms and architectures and support for file compression. An implementation of the format is available within the open source sorted pulse data software library (SPDLib; http://www.spdlib.org).

Bunting, Peter; Armston, John; Lucas, Richard M.; Clewley, Daniel

2013-07-01

486

Small-World File-Sharing Communities  

Microsoft Academic Search

Web caches, content distribution networks, peer-to-peer file sharing networks, distributed file system s, and data grids all have in common that they involve a community of users who generate requests for shared data. In each case, overall system performance can be improved significantly if we can first identify and then exploit interesting structure within a community's access patterns. To this

Adriana Iamnitchi; Matei Ripeanu; Ian T. Foster

2003-01-01

487

Correlation Based File Prefetching Approach for Hadoop  

Microsoft Academic Search

Hadoop Distributed File System (HDFS) has been widely adopted to support Internet applications because of its reliable, scalable and low-cost storage capability. Blue Sky, one of the most popular e-Learning resource sharing systems in China, is utilizing HDFS to store massive courseware. However, due to the inefficient access mechanism of HDFS, access latency of reading files from HDFS significantly impacts

Bo Dong; Xiao Zhong; Qinghua Zheng; Lirong Jian; Jian Liu; Jie Qiu; Ying Li

2010-01-01

488

Evaluation of two cooling systems under a firefighter coverall.  

PubMed

Firemen often suffer from heat strain. This study investigated two chest cooling systems for use under a firefighting suit. In nine male subjects, a vest with water soaked cooling pads and a vest with water perfused tubes were compared to a control condition. Subjects performed 30 min walking and 10 min recovery in hot conditions, while physiological and perceptual parameters were measured. No differences were observed in heart rate and rectal temperature, but scapular skin temperature and fluid loss were lower using the perfused vest. Thermal sensation was cooler for the perfused vest than for the other conditions, while the cool pad vest felt initially cooler than control. However, comfort and RPE scores were similar. We conclude that the cooling effect of both tested systems, mainly providing a (temporally) cooler thermal sensation, was limited and did not meet the expectations. PMID:24798511

Teunissen, Lennart P J; Wang, Li-Chu; Chou, Shih-Nung; Huang, Chin-Hsien; Jou, Gwo-Tsuen; Daanen, Hein A M

2014-11-01

489

Mathematical modeling of the behavior of geothermal systems under exploitation  

SciTech Connect

Analytical and numerical methods have been used in this investigation to model the behavior of geothermal systems under exploitation. The work is divided into three parts: (1) development of a numerical code, (2) theoretical studies of geothermal systems, and (3) field applications. A new single-phase three-dimensional simulator, capable of solving heat and mass flow problems in a saturated, heterogeneous porous or fractured medium has been developed. The simulator uses the integrated finite difference method for formulating the governing equations and an efficient sparse solver for the solution of the linearized equations. In the theoretical studies, various reservoir engineering problems have been examined. These include (a) well-test analysis, (b) exploitation strategies, (c) injection into fractured rocks, and (d) fault-charged geothermal reservoirs.

Bodvarsson, G.S.

1982-01-01

490

Technical Instrument Report CDBS 2008-02 Delivery of Reference Files to the  

E-print Network

of calibration pipeline and SYNPHOT reference files to the Data Management Systems (DMS). It provides guidelines In order for reference files to be used by the OTFR pipeline, these files have to be copied to OPUS disks in the header [0] of the FITS file 4. Verify that the files are in standard FITS format For calibration spectra

Sirianni, Marco

491

Propulsion system assessment for very high UAV under ERAST  

NASA Technical Reports Server (NTRS)

A series of propulsion systems were configured to power a sensor platform to very high altitudes under the Experimental Research Advanced Sensor Technology (ERAST) program. The unmanned aircraft was required to carry a 100 kg instrument package to 90,000 ft altitude, collect samples and make scientific measurements for 4 hr, and then return to base. A performance screening evaluation of 11 propulsion systems for this high altitude mission was conducted. Engine configurations ranged from turboprop, spark ignition, two- and four-stroke diesel, rotary, and fuel cell concepts. Turbo and non-turbo-compounded, recuperated and nonrecuperated arrangements, along with regular JP and hydrogen fuels were interrogated. Each configuration was carried through a preliminary design where all turbomachinery, heat exchangers, and engine core concepts were sized and weighed for near-optimum design point performance. Mission analysis, which sized the aircraft for each of the propulsion systems investigated, was conducted. From the array of configurations investigated, the propulsion system for each of three different technology levels (i.e., state of the art, near term, and far term) that was best suited for this very high altitude mission was identified and recommended for further study.

Bettner, James L.; Blandford, Craig S.; Rezy, Bernie J.

1995-01-01

492

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2013-04-01