Sample records for underlying file system

  1. Semantic File Systems

    Microsoft Academic Search

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

    1991-01-01

    A . Virtual directory names are interpreted as queries, and thus provide flexible associative access to files and directories in a manner compatible with existing software. Rapid attribute-based access to file system contents is implemented by automatic extraction and indexing of key properties of file system objects. The automatic indexing of files and directories is called \\

  2. Accessing files in an Internet: The Jade file system

    NASA Technical Reports Server (NTRS)

    Peterson, Larry L.; Rao, Herman C.

    1991-01-01

    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.

  3. Accessing files in an internet - The Jade file system

    NASA Technical Reports Server (NTRS)

    Rao, Herman C.; Peterson, Larry L.

    1993-01-01

    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.

  4. The Google file system

    Microsoft Academic Search

    Sanjay Ghemawat; Howard Gobioff; Shun-Tak Leung

    2003-01-01

    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

  5. Reporting Arezow Doost Filed Under

    E-print Network

    Chiao, Jung-Chih

    Reporting Arezow Doost Filed Under Education, Health, Local, News, Syndicated Local Related Tags dioxide exhaled by sleeping babies. Parents can buy monitors that detect movement, but this device... More Videos CBS Dallas-Fort Worth on Facebook Like 9,964 Search 72° Buy Tickets Your Home More LOGIN

  6. ----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

  7. IRON file systems

    Microsoft Academic Search

    Vijayan Prabhakaran; Lakshmi N. Bairavasundaram; Nitin Agrawal; Haryadi S. Gunawi; Andrea C. Arpaci-Dusseau; Remzi H. Arpaci-Dusseau

    2005-01-01

    Commodity file systems trust disks to either work or fail completely, yet modern disks exhibit more complex failure modes. We suggest a new fail-partial failure model for disks, which incorporates realistic localized faults such as latent sector errors and block corruption. We then develop and apply a novel failure-policy fingerprinting framework, to investigate how commodity file systems react to a

  8. Unifying File System Protection

    Microsoft Academic Search

    Christopher A. Stein; John H. Howard; Margo I. Seltzer

    2001-01-01

    This paper describes an efficient and elegant architec- ture for unifying the meta-data protection of journaling file systems with the data integrity protection of colli- sion-resistant cryptographic hashes. Traditional file sys- tem journaling protects the ordering of meta-data operations to maintain consistency in the presence of crashes. However, journaling does not protect important system meta-data and application data from modifica-

  9. An Autonomic Defragmentation File System

    Microsoft Academic Search

    Hyun-Chan Park; Jun-Seok Lee; Chuck Yoo

    To solve above problems, we propose the autonomic defragmentation file system without a degradation of system performance. At first, we design the Automatic Layout Scoring(ALS) system which is used for measuring the fragmentation ratio of the files. The ALS counts the number of contiguous blocks in a file when the blocks are allocated for the file. We can recognize the

  10. A Transactional Flash File System for Microcontrollers

    Microsoft Academic Search

    Eran Gal; Sivan Toledo

    2005-01-01

    We present a transactional file system for flash memory devices. The file system is designed for embedded mi- crocontrollers that use an on-chip or on-board NOR flash device as a persistent file store. The file system provides atomicity to arbitrary sequences of file system opera- tions, including reads, writes, file creation and deletion, and so on. The file system supports

  11. The Global File System

    NASA Technical Reports Server (NTRS)

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

    1996-01-01

    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.

  12. DMFS: A Data Migration File System for NetBSD

    NASA Technical Reports Server (NTRS)

    Studenmund, William

    1999-01-01

    I have recently developed dmfs, a Data Migration File System, for NetBSD. This file system is based on the overlay file system, which is discussed in a separate paper, and provides kernel support for the data migration system being developed by my research group here at NASA/Ames. The file system utilizes an underlying file store to provide the file backing, and coordinates user and system access to the files. It stores its internal meta data in a flat file, which resides on a separate file system. Our data migration system provides archiving and file migration services. System utilities scan the dmfs file system for recently modified files, and archive them to two separate tape stores. Once a file has been doubly archived, files larger than a specified size will be truncated to that size, potentially freeing up large amounts of the underlying file store. Some sites will choose to retain none of the file (deleting its contents entirely from the file system) while others may choose to retain a portion, for instance a preamble describing the remainder of the file. The dmfs layer coordinates access to the file, retaining user-perceived access and modification times, file size, and restricting access to partially migrated files to the portion actually resident. When a user process attempts to read from the non-resident portion of a file, it is blocked and the dmfs layer sends a request to a system daemon to restore the file. As more of the file becomes resident, the user process is permitted to begin accessing the now-resident portions of the file. For simplicity, our data migration system divides a file into two portions, a resident portion followed by an optional non-resident portion. Also, a file is in one of three states: fully resident, fully resident and archived, and (partially) non-resident and archived. For a file which is only partially resident, any attempt to write or truncate the file, or to read a non-resident portion, will trigger a file restoration. Truncations and writes are blocked until the file is fully restored so that a restoration which only partially succeed does not leave the file in an indeterminate state with portions existing only on tape and other portions only in the disk file system. We chose layered file system technology as it permits us to focus on the data migration functionality, and permits end system administrators to choose the underlying file store technology. We chose the overlay layered file system instead of the null layer for two reasons: first to permit our layer to better preserve meta data integrity and second to prevent even root processes from accessing migrated files. This is achieved as the underlying file store becomes inaccessible once the dmfs layer is mounted. We are quite pleased with how the layered file system has turned out. Of the 45 vnode operations in NetBSD, 20 (forty-four percent) required no intervention by our file layer - they are passed directly to the underlying file store. Of the twenty five we do intercept, nine (such as vop_create()) are intercepted only to ensure meta data integrity. Most of the functionality was concentrated in five operations: vop_read, vop_write, vop_getattr, vop_setattr, and vop_fcntl. The first four are the core operations for controlling access to migrated files and preserving the user experience. vop_fcntl, a call generated for a certain class of fcntl codes, provides the command channel used by privileged user programs to communicate with the dmfs layer.

  13. The Vesta parallel file system

    Microsoft Academic Search

    Peter F. Corbett; Dror G. Feitelson

    1996-01-01

    The Vesta parallel file system is designed to provide parallel file access to application programs running on multicomputers with parallel I\\/O subsystems. Vesta uses a new abstraction of files: a file is not a sequence of bytes, but rather it can be partitioned into multiple disjoint sequences that are accessed in parallel. The partitioning—which can also be changed dynamically—reduces the

  14. Large File System Backup: NERSC Global File System Experience

    SciTech Connect

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

    2008-10-23

    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.

  15. DMFS: A Data Migration File System for NetBSD

    NASA Technical Reports Server (NTRS)

    Studenmund, William

    2000-01-01

    I have recently developed DMFS, a Data Migration File System, for NetBSD. This file system provides kernel support for the data migration system being developed by my research group at NASA/Ames. The file system utilizes an underlying file store to provide the file backing, and coordinates user and system access to the files. It stores its internal metadata in a flat file, which resides on a separate file system. This paper will first describe our data migration system to provide a context for DMFS, then it will describe DMFS. It also will describe the changes to NetBSD needed to make DMFS work. Then it will give an overview of the file archival and restoration procedures, and describe how some typical user actions are modified by DMFS. Lastly, the paper will present simple performance measurements which indicate that there is little performance loss due to the use of the DMFS layer.

  16. The Galley Parallel File System

    NASA Technical Reports Server (NTRS)

    Nieuwejaar, Nils; Kotz, David

    1996-01-01

    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.

  17. The Galley Parallel File System

    NASA Technical Reports Server (NTRS)

    Nieuwejaar, Nils; Kotz, David

    1996-01-01

    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.

  18. The Echo Distributed File System

    Microsoft Academic Search

    Andrew D. Birrell; Andy Hisgen; Chuck Jerian; Timothy Mann; Garret Swart

    Echo is an ambitious distributed file system. It was designed around a truly global name space. It uses a coherent caching algorithm. It is fault tolerant. And it is real, it was the primary file system for a large group of researchers. Its novel aspects include an extensible \\

  19. The Jade File System. Ph.D. Thesis

    NASA Technical Reports Server (NTRS)

    Rao, Herman Chung-Hwa

    1991-01-01

    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.

  20. Data Structures for Storing File Namespace in Distributed File System

    Microsoft Academic Search

    Luu Hoang Long; Eunmi Choi; SangBum Kim; Pilsung Kim

    2008-01-01

    The distributed file system (DFS) provides a mechanism where a file can be stored across several physical computer nodes ensuring replication transparency and failure transparency. In order to achieve this, one important feature of DFS's data structure is to employ a proper way to organize the large scale data and file namespaces to provide a fast access speed. In order

  1. A Foolproof Personal Filing System.

    ERIC Educational Resources Information Center

    Holmes, Thomas F.; Gentry, Castelle G.

    1979-01-01

    Describes the personal inverted filing system (PIFS) which features (1) storage accession numbers, (2) main entry bibliography cards, (3) retrieval by matrix or bibliography cards, and (4) classification by descriptors from existing thesauri. (CMV)

  2. A Cached WORM File System

    Microsoft Academic Search

    Sean Quinlan

    1991-01-01

    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

  3. Forensics for advanced UNIX file systems

    Microsoft Academic Search

    Knut Eckstein

    2004-01-01

    Advanced UNIX file systems differ substantially from traditional UNIX file systems with respect to their internal layout and data structures. This paper analyzes these differences and their effects on the methods and results of digital forensic media analysis. In addition, it provides results from a prototype implementation of a forensic toolkit for an advanced UNIX file system, IBM's Journaling File

  4. The Future of the Andrew File System

    ScienceCinema

    None

    2011-04-25

    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.

  5. Defragmenting DHT-based Distributed File Systems

    Microsoft Academic Search

    Jeffrey Pang; Phillip B. Gibbons; Michael Kaminsky; Srinivasan Seshan; Haifeng Yu

    2007-01-01

    Existing DHT-based file systems use consistent hashing to assign file blocks to random machines. As a result, a user task accessing an entire file or multiple files needs to retrieve blocks from many different machines. This paper demonstrates that significant availability and performance gains can be achieved if, instead, users are able to retrieve all the data needed for a

  6. The Midas Table File System

    NASA Astrophysics Data System (ADS)

    Grosbol, P.; Ponz, D.

    The general use of tables in image processing and data handling is discussed. The basic structure of the MIDAS Table File System is described both in terms of design requirements and internal organization. A set of operations on table structures is given to illustrate the typical applications. Finally, the interface to the MIDAS system is discussed with examples of the syntax.

  7. Separating key management from file system security

    Microsoft Academic Search

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

    1999-01-01

    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

  8. Zebra: A striped network file system

    NASA Technical Reports Server (NTRS)

    Hartman, John H.; Ousterhout, John K.

    1992-01-01

    The design of Zebra, a striped network file system, is presented. Zebra applies ideas from log-structured file system (LFS) and RAID research to network file systems, resulting in a network file system that has scalable performance, uses its servers efficiently even when its applications are using small files, and provides high availability. Zebra stripes file data across multiple servers, so that the file transfer rate is not limited by the performance of a single server. High availability is achieved by maintaining parity information for the file system. If a server fails its contents can be reconstructed using the contents of the remaining servers and the parity information. Zebra differs from existing striped file systems in the way it stripes file data: Zebra does not stripe on a per-file basis; instead it stripes the stream of bytes written by each client. Clients write to the servers in units called stripe fragments, which are analogous to segments in an LFS. Stripe fragments contain file blocks that were written recently, without regard to which file they belong. This method of striping has numerous advantages over per-file striping, including increased server efficiency, efficient parity computation, and elimination of parity update.

  9. The MOSIX Direct File System Access Method for Supporting Scalable Cluster File Systems

    Microsoft Academic Search

    Lior Amar; Amnon Barak; Amnon Shiloh

    2004-01-01

    MOSIX is a cluster management system that supports preemptive process migration. This paper presents the MOSIX Direct File System Access (DFSA), a provision that can improve the performance of cluster file systems by allowing a migrated process to directly access files in its current location. This capability, when combined with an appropriate file system, could substantially increase the I\\/O performance

  10. Symphony: An Integrated Multimedia File System

    Microsoft Academic Search

    Prashant J. Shenoy; Pawan Goyal; Sriram S. Rao; Harrick M. Vin

    1998-01-01

    An integrated multimedia file system supports the storage and retrieval of multiple data types. In this paper, we first discuss various design methodologies for building integrated file systems and examine their tradeoffs. We argue that, to efficiently support the storage and retrieval of heterogeneous data types, an integrated file system should enable the coexistence of multiple data type specific techniques.

  11. USP: A Lightweight File System Management Framework

    Microsoft Academic Search

    Zhan Shi; Dan Feng; Heng Zhao; Lingfang Zeng

    2010-01-01

    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

  12. Metadata Efficiency in Versioning File Systems

    Microsoft Academic Search

    Craig A. N. Soules; Garth R. Goodson; John D. Strunk; Gregory R. Ganger

    2003-01-01

    Versioning file systems retain earlier versions of modi- fied files, allowing recovery from user mistakes or sys- tem corruption. Unfortunately, conventional versioning systems do not efficiently record large numbers of ver- sions. In particular, versioned metadata can consume as much space as versioned data. This paper examines two space-efficient metadata structures for versioning file systems and describes their integration into

  13. A Metadata-Rich File System

    SciTech Connect

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

    2009-01-07

    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.

  14. Overview of the Vesta parallel file system

    Microsoft Academic Search

    Peter F. Corbett; Sandra Johnson Baylor; Dror G. Feitelson

    1993-01-01

    The Vesta parallel file system provides parallel access from compute nodes to files distributed across I\\/O nodes in a massively parallel computer. Vesta is intended to solve the I\\/O problems of massively parallel computers executing numerically intensive scientific applications. Vesta has three interesting characteristics: First, it provides a user defined parallel view of file data, and allows user defined partitioning

  15. Deceit: A flexible distributed file system

    NASA Technical Reports Server (NTRS)

    Siegel, Alex; Birman, Kenneth; Marzullo, Keith

    1989-01-01

    Deceit, a distributed file system (DFS) being developed at Cornell, focuses on flexible file semantics in relation to efficiency, scalability, and reliability. Deceit servers are interchangeable and collectively provide the illusion of a single, large server machine to any clients of the Deceit service. Non-volatile replicas of each file are stored on a subset of the file servers. The user is able to set parameters on a file to achieve different levels of availability, performance, and one-copy serializability. Deceit also supports a file version control mechanism. In contrast with many recent DFS efforts, Deceit can behave like a plain Sun Network File System (NFS) server and can be used by any NFS client without modifying any client software. The current Deceit prototype uses the ISIS Distributed Programming Environment for all communication and process group management, an approach that reduces system complexity and increases system robustness.

  16. 47 CFR 1.990 - Citizenship and filing requirements under the Communications Act of 1934.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...filing requirements under the Communications Act of 1934. 1.990 ...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL PRACTICE...filing requirements under the Communications Act of 1934....

  17. The Andrew File System (AFS) The Andrew File System was introduced by researchers at Carnegie-

    E-print Network

    Sheridan, Jennifer

    35 The Andrew File System (AFS) The Andrew File System was introduced by researchers at Carnegie of Carnegie-Mellon Uni- versity ("Satya" for short), the main goal of this project was simple: scale (which we will call 1 #12;2 THE ANDREW FILE SYSTEM (AFS) AFSv2, or just AFS) [H+88]. We now discuss

  18. File system virtual appliances: Third-party file system implementations without the pain

    E-print Network

    File system virtual appliances: Third-party file system implementations without the pain Michael, extensibility 1 #12;1 Introduction Building and maintaining third-party file systems (FSs) is painful. Of course with version-specific "#ifdef"s, making it increasingly difficult to understand and modify correctly. The pain

  19. Reliable Parallel File System Using RAID Technology

    Microsoft Academic Search

    Sheng-Kai Hung; Yarsun Hsu

    2004-01-01

    Providing data avaliability in a cluster environ- ment is very important. Most clusters either use RAID technology or redudant nodes to ensure reliability. High performance clusters usually use parallel file systems to increase throughput. However, when parallel file system is involved in a cluster system, some mechanism must be provided to overcome the side-effect of using striping. PVFS is a

  20. Small-file access in parallel file systems

    Microsoft Academic Search

    Philip H. Carns; Sam Lang; Robert B. Ross; Murali Vilayannur; Julian M. Kunkel; Thomas Ludwig

    2009-01-01

    Today's computational science demands have re- sulted in ever larger parallel computers, and storage systems have grown to match these demands. Parallel file systems used in this environment are increasingly specialized to extract the highest possible performance for large I\\/O operations, at the expense of other potential workloads. While some applications have adapted to I\\/O best practices and can obtain

  1. TABLEFS: Enhancing Metadata Efficiency in the Local File System

    E-print Network

    FS, File System, File System Metadata, NoSQL Database, LSM Tree #12;Abstract Abstract File systems, commonly called key-value stores, that emphasize simple (NoSQL) interfaces and large in-memory caches [2

  2. 76 FR 43206 - Electronic Tariff Filing System (ETFS)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-20

    ...Tariff Filing System (ETFS) to...using the ETFS system to file their...a personal communications service (PCS...radiotelephone (wireless) companies...for telephone communications companies other...radiotelephone (wireless) companies...Tariff Filing System, if not...

  3. A fast file system for UNIX

    Microsoft Academic Search

    Marshall K. McKusick; William N. Joy; Samuel J. Leffler; Robert S. Fabry

    1984-01-01

    A reimplementation of the UNIX file system is described. The reimplementation provides substantially higher throughput rates by using more flexible allocation policies that allow better locality of reference and can be adapted to a wide range of peripheral and processor characteristics. The new file system clusters data that is sequentially accessed and provides two block sizes to allow fast access

  4. Scaling NFSv4 with parallel file systems

    Microsoft Academic Search

    Dean Hildebrand; Peter Honeyman

    2005-01-01

    Large grid installations require global access to massive data stores. Parallel file systems give high throughput within a LAN, but cross-site data transfers lack seamless integration, security, and performance. The GridNFS project, aims to provide scalable, transparent, and secure data management as well as a scalable and agile name space. A key challenge in exporting a parallel file system with

  5. Prefetching in file systems for MIMD multiprocessors

    NASA Technical Reports Server (NTRS)

    Kotz, David F.; Ellis, Carla Schlatter

    1990-01-01

    The question of whether prefetching blocks on the file into the block cache can effectively reduce overall execution time of a parallel computation, even under favorable assumptions, is considered. Experiments have been conducted with an interleaved file system testbed on the Butterfly Plus multiprocessor. Results of these experiments suggest that (1) the hit ratio, the accepted measure in traditional caching studies, may not be an adequate measure of performance when the workload consists of parallel computations and parallel file access patterns, (2) caching with prefetching can significantly improve the hit ratio and the average time to perform an I/O (input/output) operation, and (3) an improvement in overall execution time has been observed in most cases. In spite of these gains, prefetching sometimes results in increased execution times (a negative result, given the optimistic nature of the study). The authors explore why it is not trivial to translate savings on individual I/O requests into consistently better overall performance and identify the key problems that need to be addressed in order to improve the potential of prefetching techniques in the environment.

  6. Postmark: a new file system benchmark

    Microsoft Academic Search

    J. Katcher

    1997-01-01

    Existing file system benchmarks are deficient in portraying performance in the ephemeral small-file regime used by Internet software, especially: electronicmail; netnews; and web-based commerce. PostMark is a new benchmark to measure performance for this class of application.In this paper, PostMark test results are presented and analyzed for both UNIX and Windows NT application servers. Network Appliance Filers (file server appliances)

  7. Deciding when to forget in the Elephant file system

    Microsoft Academic Search

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

    1999-01-01

    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

  8. NASA ARCH- A FILE ARCHIVAL SYSTEM FOR THE DEC VAX

    NASA Technical Reports Server (NTRS)

    Scott, P. J.

    1994-01-01

    The function of the NASA ARCH system is to provide a permanent storage area for files that are infrequently accessed. The NASA ARCH routines were designed to provide a simple mechanism by which users can easily store and retrieve files. The user treats NASA ARCH as the interface to a black box where files are stored. There are only five NASA ARCH user commands, even though NASA ARCH employs standard VMS directives and the VAX BACKUP utility. Special care is taken to provide the security needed to insure file integrity over a period of years. The archived files may exist in any of three storage areas: a temporary buffer, the main buffer, and a magnetic tape library. When the main buffer fills up, it is transferred to permanent magnetic tape storage and deleted from disk. Files may be restored from any of the three storage areas. A single file, multiple files, or entire directories can be stored and retrieved. archived entities hold the same name, extension, version number, and VMS file protection scheme as they had in the user's account prior to archival. NASA ARCH is capable of handling up to 7 directory levels. Wildcards are supported. User commands include TEMPCOPY, DISKCOPY, DELETE, RESTORE, and DIRECTORY. The DIRECTORY command searches a directory of savesets covering all three archival areas, listing matches according to area, date, filename, or other criteria supplied by the user. The system manager commands include 1) ARCHIVE- to transfer the main buffer to duplicate magnetic tapes, 2) REPORTto determine when the main buffer is full enough to archive, 3) INCREMENT- to back up the partially filled main buffer, and 4) FULLBACKUP- to back up the entire main buffer. On-line help files are provided for all NASA ARCH commands. NASA ARCH is written in DEC VAX DCL for interactive execution and has been implemented on a DEC VAX computer operating under VMS 4.X. This program was developed in 1985.

  9. Small file aggregation in a parallel computing system

    DOEpatents

    Faibish, Sorin; Bent, John M.; Tzelnic, Percy; Grider, Gary; Zhang, Jingwang

    2014-09-02

    Techniques are provided for small file aggregation in a parallel computing system. An exemplary method for storing a plurality of files generated by a plurality of processes in a parallel computing system comprises aggregating the plurality of files into a single aggregated file; and generating metadata for the single aggregated file. The metadata comprises an offset and a length of each of the plurality of files in the single aggregated file. The metadata can be used to unpack one or more of the files from the single aggregated file.

  10. [PVFS 2000: An operational parallel file system for Beowulf

    NASA Technical Reports Server (NTRS)

    Ligon, Walt

    2004-01-01

    The approach has been to develop Parallel Virtual File System version 2 (PVFS2) , retaining the basic philosophy of the original file system but completely rewriting the code. It shows the architecture of the server and client components. BMI - BMI is the network abstraction layer. It is designed with a common driver and modules for each protocol supported. The interface is non-blocking, and provides mechanisms for optimizations including pinning user buffers. Currently TCP/IP and GM(Myrinet) modules have been implemented. Trove -Trove is the storage abstraction layer. It provides for storing both data spaces and name/value pairs. Trove can also be implemented using different underlying storage mechanisms including native files, raw disk partitions, SQL and other databases. The current implementation uses native files for data spaces and Berkeley db for name/value pairs.

  11. Performance of the Galley Parallel File System

    NASA Technical Reports Server (NTRS)

    Nieuwejaar, Nils; Kotz, David

    1996-01-01

    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.

  12. Tiger Shark - A scalable file system for multimedia

    Microsoft Academic Search

    Roger L. Haskin

    1998-01-01

    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,

  13. Pollution in P2P file sharing systems

    Microsoft Academic Search

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

    2005-01-01

    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

  14. An efficient multimedia file system for NAND flash memory storage

    Microsoft Academic Search

    Sang Oh Park; Sung Jo Kim

    2009-01-01

    Since the existing NAND flash memory file systems manage file data in page units, the memory usage increases greatly as the number and size of files increase, and the area to scan at the mounting time increases linearly as well. To resolve these problems, this paper suggests data management in segment units for more efficient processing of multimedia files to

  15. Modeling Peer-Peer File Sharing Systems

    Microsoft Academic Search

    Zihui Ge; Daniel R. Figueiredo; Sharad Jaiswal; James F. Kurose; Donald F. Towsley

    2003-01-01

    Peer-peer networking has recently emerged as a new paradigm for building distributed networked applications. In this paper we develop simple mathematical models to explore and illustrate fundamental performance issues of peer-peer file sharing systems. The modeling framework introduced and the corresponding solution method are flexible enough to accom- modate different characteristics of such systems. Through the specification of model parameters,

  16. 34 CFR 222.154 - How must written submissions under this subpart be filed?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION IMPACT AID PROGRAMS Impact Aid Administrative Hearings and Judicial Review Under Section 8011 of the Act § 222.154 How must written submissions under this subpart be filed...administrative law judge (ALJ). (e) Any party filing a document by facsimile transmission must file a follow-up hard copy by......

  17. TABLEFS: Enhancing Metadata Efficiency in the Local File System

    E-print Network

    for their interest, insights, feedback, and support. #12;Keywords: TableFS, File System, File System Metadata, NoSQL Database, LSM Tree #12;Abstract Abstract File systems that manage magnetic disks have long recognized-data storage systems, commonly called key-value stores, that emphasize simple (NoSQL) interfaces and large in

  18. The parallel virtual file system for portals.

    SciTech Connect

    Schutt, James Alan

    2004-04-01

    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.

  19. Directory Reference Patterns in Hierarchical File Systems

    Microsoft Academic Search

    Richard A. Floyd; Carla Schlatter Ellis

    1989-01-01

    The authors present a brief description of data on directory reference patterns collected from a 4.2BSD UNIX system. These data are used to examine the importance of the name lookup overhead involved in opening and using files. The analysis shows that paths in the environment are relatively long and that, in the absence of caching, name resolution overhead accounts for

  20. An Efficient NAND Flash File System for Flash Memory Storage

    Microsoft Academic Search

    Seung-Ho Lim; Kyu-Ho Park

    2006-01-01

    In this paper, we present an efficient flash file system for flash memory storage. Flash memory, especially NAND flash memory, has become a major method for data storage. Currently, a block level translation interface is required between an existing file system and flash memory chips due to its physical characteristics. However, the approach of existing file systems on top of

  1. 3RIP: File Design for the Search System.

    ERIC Educational Resources Information Center

    Larsson, Rolf; And Others

    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 of text and numeric data. Searchable attributes are keywords, words or phrases in text, names,…

  2. Defragmenting DHT-based Distributed File Systems Jeffrey Pang

    E-print Network

    Yu, Haifeng

    of Singapore Abstract Existing DHT-based file systems use consistent hashing to assign file blocks to random. Second, a new DHT lookup must be performed to locate each block accessed by the task since each blockDefragmenting DHT-based Distributed File Systems Jeffrey Pang Phillip B. Gibbons Michael Kaminsky

  3. A History of the Andrew File System

    SciTech Connect

    None

    2011-02-22

    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.

  4. Electronic Document Management Using Inverted Files System

    NASA Astrophysics Data System (ADS)

    Suhartono, Derwin; Setiawan, Erwin; Irwanto, Djon

    2014-03-01

    The amount of documents increases so fast. Those documents exist not only in a paper based but also in an electronic based. It can be seen from the data sample taken by the SpringerLink publisher in 2010, which showed an increase in the number of digital document collections from 2003 to mid of 2010. Then, how to manage them well becomes an important need. This paper describes a new method in managing documents called as inverted files system. Related with the electronic based document, the inverted files system will closely used in term of its usage to document so that it can be searched over the Internet using the Search Engine. It can improve document search mechanism and document save mechanism.

  5. Design and Implementation of a Metadata-rich File System

    SciTech Connect

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

    2010-01-19

    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.

  6. Design and implementation of the Vesta parallel file system

    Microsoft Academic Search

    Peter F. Corbett; Dror G. Feitelson

    1994-01-01

    The Vesta parallel file system is designed to provide parallel file access to application programs running on multicomputers with parallel I\\/O subsystems. Vesta uses a new abstraction of files: a file is not a sequence of bytes, but rather it can be partitioned into multiple disjoint sequences that are accessed in parallel. The partitioning-which can also be changed dynamically-reduces the

  7. AutoFS - An Automounting File System for FreeBSD 6.x

    Microsoft Academic Search

    Adam David; Alan Martin; Erez Zadok

    File systems store, organize, and retrieve data for users and often these files are stored on remote ma- chines, or removable media. The UNIX system requires that these file systems must be mounted before files can be accessed. In network environments, mounted file sys- tems can result in extra traffic, even when the file sys- tem is mounted, but no

  8. Stochastic Analysis and File Availability Enhancement for BT-like File Sharing Systems

    E-print Network

    Stochastic Analysis and File Availability Enhancement for BT-like File Sharing Systems Bin Fan Dept-- In this paper, we present the mathematical analysis of two important performance measures for a BitTorrent (BT availability of a BT-like system. The model helps us gain the understanding of why the "rarest-first" chunk

  9. Efficient De-Fragmented Writeback for Journaling File System

    Microsoft Academic Search

    Seung-Ho Lim; Hyun Jin Choi; Jong Hyuk Park

    \\u000a Journaling file systems are widely used file systems to guarantee data integrity. However, the system performance is degraded\\u000a due to data request fragmentations. We propose a technique that efficiently handles fragmented data workloads in journaling\\u000a file system, which we call De-Fragmented Writeback(DFW). The first method of the DFW sorts write orders of the atomic data\\u000a set in accordance with their

  10. Optimizing Input/Output Using Adaptive File System Policies

    NASA Technical Reports Server (NTRS)

    Madhyastha, Tara M.; Elford, Christopher L.; Reed, Daniel A.

    1996-01-01

    Parallel input/output characterization studies and experiments with flexible resource management algorithms indicate that adaptivity is crucial to file system performance. In this paper we propose an automatic technique for selecting and refining file system policies based on application access patterns and execution environment. An automatic classification framework allows the file system to select appropriate caching and pre-fetching policies, while performance sensors provide feedback used to tune policy parameters for specific system environments. To illustrate the potential performance improvements possible using adaptive file system policies, we present results from experiments involving classification-based and performance-based steering.

  11. Implementing a Shared File System on a HIPPI Disk Array

    Microsoft Academic Search

    Kevin C. Matthews

    1995-01-01

    Shared file systems which use a physically shared mass storage device have existed for many years, although not on UNIX based operating systems. This paper describes a shared file system (SFS) that was implemented first as a special project on the Gray Research Inc. (CRI) UNICOS operating system. A more general product was then built on top of this project

  12. Disconnected Operation in the Coda File System

    E-print Network

    James J. Kistler; M. Satyanarayanan

    1992-01-01

    Disconnected operation is a mode of operation that enables a client to continue accessing critical data during temporary failures of a shared data repository. An important, though not exclusive, application of disconnected operation is in supporting portable computers. In this paper, we show that disconnected operation is feasible, efficient and usable by describing its design and implementation in the Coda File System. The central idea behind our work is that caching of data, now widely used for performance, can also be exploited to improve availability.

  13. Energy Efficient Prefetching with Buffer Disks for Cluster File Systems

    E-print Network

    Qin, Xiao

    Energy Efficient Prefetching with Buffer Disks for Cluster File Systems Adam Manzanares, Xiaojun the energy- efficiency of large scale parallel storage systems. To address these issues we introduce EEVFS (Energy Efficient Virtual File System), which is able to manage data placement and disk states to help

  14. Silvabase: A flexible data file management system

    NASA Technical Reports Server (NTRS)

    Lambing, Steven J.; Reynolds, Sandra J.

    1991-01-01

    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.

  15. A method of merging VMware disk images through file system unification

    E-print Network

    Cheng, Sarah X

    2011-01-01

    This thesis describes a method of merging the contents of two VMware disk images by merging the file systems therein. Thus, two initially disparate file systems are joined to appear and behave as a single file system. The ...

  16. Parallel File Systems for the IBM SP Computers

    Microsoft Academic Search

    Peter F. Corbett; Dror G. Feitelson; Jean-pierre Prost; George S. Almasi; Sandra Johnson Baylor; Anthony Bolmarcich; Yarsun Hsu; Julian Satran; Marc Snir; Robert Colao; Brian D. Herr; Joe Kavaky; Thomas R. Morgan; Anthony Zlotek

    1995-01-01

    Parallel computer architectures require innovative software solutions to utilize their capabilities. This statement is true for system software no less than for application programs. File system development for the ISM SP product line of computers started with the Vesta research project, which introduced the ideas of parallel access to partitioned files. This technology was then integrated with a conventional Advanced

  17. On designing generalized file records for management information systems

    Microsoft Academic Search

    Frank H. Benner

    1967-01-01

    The centrality of the files in a MIS (Management Information System), or in any other large scale computer application, has been traditionally considered as self-evident. The new problems of operating systems and the languages for use in the 3rd generation computers, plus the relatively unknown world of integrated data communications may tend to remove the files from the limelight. This

  18. The logical disk: a new approach to improving file systems

    Microsoft Academic Search

    Wiebren De Jonge; M. Frans Kaashoek; Wilson C. Hsieh

    1994-01-01

    The Logical Disk (LD) defines a new interface to disk storage that separates file management and disk management by using logical block numbers and block lists. The LD interface is designed to support multiple file systems and to allow multiple implementations, both of which are important given the increasing use of kernels that support multiple operating system personalities.A log-structured implementation

  19. The Logical Disk: A New Approach to Improving File Systems

    Microsoft Academic Search

    Wiebren de Jonge; M. Frans Kaashoek; Wilson C. Hsieh

    1993-01-01

    The Logical Disk (LD) defines a new interface to disk storage that separates file management and disk management by using logical block numbers and block lists. The LD interface is designed to support multiple file systems and to allow multiple implementations, both of which are important given the increasing use of kernels that support multiple operating system personalities.A log-structured implementation

  20. Performance and Scalability Evaluation of the Ceph Parallel File System

    SciTech Connect

    Wang, Feiyi [ORNL] [ORNL; Nelson, Mark [Inktank Storage, Inc.] [Inktank Storage, Inc.; Oral, H Sarp [ORNL] [ORNL; Settlemyer, Bradley W [ORNL] [ORNL; Atchley, Scott [ORNL] [ORNL; Caldwell, Blake A [ORNL] [ORNL; Hill, Jason J [ORNL] [ORNL

    2013-01-01

    Ceph is an open-source and emerging parallel distributed file and storage system technology. By design, Ceph assumes running on unreliable and commodity storage and network hardware and provides reliability and fault-tolerance through controlled object placement and data replication. We evaluated the Ceph technology for scientific high-performance computing (HPC) environments. This paper presents our evaluation methodology, experiments, results and observations from mostly parallel I/O performance and scalability perspectives. Our work made two unique contributions. First, our evaluation is performed under a realistic setup for a large-scale capability HPC environment using a commercial high-end storage system. Second, our path of investigation, tuning efforts, and findings made direct contributions to Ceph's development and improved code quality, scalability, and performance. These changes should also benefit both Ceph and HPC communities at large. Throughout the evaluation, we observed that Ceph still is an evolving technology under fast-paced development and showing great promises.

  1. Stochastic Petri net analysis of a replicated file system

    NASA Technical Reports Server (NTRS)

    Bechta Dugan, Joanne; Ciardo, Gianfranco

    1989-01-01

    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.

  2. Comparison of leading parallel NAS file systems on commodity hardware

    SciTech Connect

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

    2010-11-08

    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.

  3. Using the Sirocco File System for high-bandwidth checkpoints.

    SciTech Connect

    Klundt, Ruth Ann; Curry, Matthew L.; Ward, H. Lee

    2012-02-01

    The Sirocco File System, a file system for exascale under active development, is designed to allow the storage software to maximize quality of service through increased flexibility and local decision-making. By allowing the storage system to manage a range of storage targets that have varying speeds and capacities, the system can increase the speed and surety of storage to the application. We instrument CTH to use a group of RAM-based Sirocco storage servers allocated within the job as a high-performance storage tier to accept checkpoints, allowing computation to potentially continue asynchronously of checkpoint migration to slower, more permanent storage. The result is a 10-60x speedup in constructing and moving checkpoint data from the compute nodes. This demonstration of early Sirocco functionality shows a significant benefit for a real I/O workload, checkpointing, in a real application, CTH. By running Sirocco storage servers within a job as RAM-only stores, CTH was able to store checkpoints 10-60x faster than storing to PanFS, allowing the job to continue computing sooner. While this prototype did not include automatic data migration, the checkpoint was available to be pushed or pulled to disk-based storage as needed after the compute nodes continued computing. Future developments include the ability to dynamically spawn Sirocco nodes to absorb checkpoints, expanding this mechanism to other fast tiers of storage like flash memory, and sharing of dynamic Sirocco nodes between multiple jobs as needed.

  4. Availability and Consistency Tradeoffs in the Echo Distributed File System

    Microsoft Academic Search

    Andy Hisgen; Andrew Birrell; Timothy Mann; Michael D. Schroeder; Garret Swart

    1989-01-01

    Workstations typically depend on remote servers accessed over a network for such services as mail, printing, storing files, booting, and time. The availability of these remote services has a major impact on the usability of the workstation. Availability can be increased by repli- cating the servers. In the Echo distributed file system at DEC SRC, two different replication techniques are

  5. 37 CFR 1.109 - Effective filing date of a claimed invention under the Leahy-Smith America Invents Act.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Effective filing date of a claimed invention under the Leahy-Smith America Invents Act. 1.109 Section 1.109 Patents...Effective filing date of a claimed invention under the Leahy-Smith America Invents Act. (a) The effective filing date...

  6. 37 CFR 1.109 - Effective filing date of a claimed invention under the Leahy-Smith America Invents Act.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Effective filing date of a claimed invention under the Leahy-Smith America Invents Act. 1.109 Section 1.109 Patents...Effective filing date of a claimed invention under the Leahy-Smith America Invents Act. (a) The effective filing date...

  7. Configuration Management File Manager Developed for Numerical Propulsion System Simulation

    NASA Technical Reports Server (NTRS)

    Follen, Gregory J.

    1997-01-01

    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.

  8. Structure and Performance of the Direct Access File System

    Microsoft Academic Search

    Kostas Magoutis; Salimah Addetia; Alexandra Fedorova; Andrew J. Gallatin; Richard Kisley

    2001-01-01

    The Direct Access File System (DAFS) is an emergingindustrial standard for network-attached storage.DAFS takes advantage of new user-level net-work interface standards. This enables a user-levelfile system structure in which client-side functionalityfor remote data access resides in a libraryrather than in the kernel. This structure addresseslongstanding performance problems stemming fromweak integration of buffering layers in the networktransport, kernel-based file systems and...

  9. Spatial Hypertexts as an Interface to the File System Anna Zacchi

    E-print Network

    Shipman, Frank

    hypertexts to organize personal collections of files in a workspace environment. Files in file systems of several items, the folder/directory structure where users store their files, documents and programs environment and that allows to specify spatial relationships among the items. DIFFERENT WAYS TO USE THE FILE

  10. Performance Evaluation of Parallel File Systems for PC Clusters and ASCI Red

    Microsoft Academic Search

    Sharad Garg; Jens Mache

    2001-01-01

    Parallel file systems provide high performance disk access, which is crucial for many scientific and commercial applications. In this paper, we explore the current state of the art of parallel file systems for PC clusters. To do so, we evaluate the I\\/O performance of Intel PFS, a commercial file system for ASCI Red, and PVFS, an open-source file system for

  11. A CDP method in an object-based file system

    NASA Astrophysics Data System (ADS)

    Yao, Jie; Cao, Qiang; Li, Huaiyang

    2008-12-01

    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.

  12. High-Performance, Multi-Node File Copies and Checksums for Clustered File Systems

    NASA Technical Reports Server (NTRS)

    Kolano, Paul Z.; Ciotti, Robert B.

    2012-01-01

    Modern parallel file systems achieve high performance using a variety of techniques, such as striping files across multiple disks to increase aggregate I/O bandwidth and spreading disks across multiple servers to increase aggregate interconnect bandwidth. To achieve peak performance from such systems, it is typically necessary to utilize multiple concurrent readers/writers from multiple systems to overcome various singlesystem limitations, such as number of processors and network bandwidth. The standard cp and md5sum tools of GNU coreutils found on every modern Unix/Linux system, however, utilize a single execution thread on a single CPU core of a single system, and hence cannot take full advantage of the increased performance of clustered file systems. Mcp and msum are drop-in replacements for the standard cp and md5sum programs that utilize multiple types of parallelism and other optimizations to achieve maximum copy and checksum performance on clustered file systems. Multi-threading is used to ensure that nodes are kept as busy as possible. Read/write parallelism allows individual operations of a single copy to be overlapped using asynchronous I/O. Multinode cooperation allows different nodes to take part in the same copy/checksum. Split-file processing allows multiple threads to operate concurrently on the same file. Finally, hash trees allow inherently serial checksums to be performed in parallel. Mcp and msum provide significant performance improvements over standard cp and md5sum using multiple types of parallelism and other optimizations. The total speed-ups from all improvements are significant. Mcp improves cp performance over 27x, msum improves md5sum performance almost 19x, and the combination of mcp and msum improves verified copies via cp and md5sum by almost 22x. These improvements come in the form of drop-in replacements for cp and md5sum, so are easily used and are available for download as open source software at http://mutil.sourceforge.net.

  13. 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 small file accesses. This paper examines using techniques adopated from NoSQL databasesFS, File System, File System Metadata, NoSQL Database, LSM Tree #12;Introduction While parallel

  14. 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

    2010-04-01

    ...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...

  15. 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

    2011-04-01

    ...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...

  16. 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

    2013-04-01

    ...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...

  17. 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

    2012-04-01

    ...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...

  18. 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, 2014 CFR

    2014-04-01

    ...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...

  19. Improving the System Performance by a Dynamic File Prediction Model

    Microsoft Academic Search

    Tsozen Yeh; Joseph Arul; Kuo-hsin Tien; I-fan Chen; Jia-shian Wu

    2006-01-01

    As the speed gap between CPU and I\\/O is getting wider and wider, I\\/O latency plays a more important role to the overall system performance than it used to be. Prefetch- ing consecutive data blocks within individual files has been explored to hide, at least partially, the I\\/O latency. Un- fortunately, this does not reduce the inter-file latency oc- curring

  20. Storing files in a parallel computing system based on user-specified parser function

    DOEpatents

    Faibish, Sorin; Bent, John M; Tzelnic, Percy; Grider, Gary; Manzanares, Adam; Torres, Aaron

    2014-10-21

    Techniques are provided for storing files in a parallel computing system based on a user-specified parser function. A plurality of files generated by a distributed application in a parallel computing system are stored by obtaining a parser from the distributed application for processing the plurality of files prior to storage; and storing one or more of the plurality of files in one or more storage nodes of the parallel computing system based on the processing by the parser. The plurality of files comprise one or more of a plurality of complete files and a plurality of sub-files. The parser can optionally store only those files that satisfy one or more semantic requirements of the parser. The parser can also extract metadata from one or more of the files and the extracted metadata can be stored with one or more of the plurality of files and used for searching for files.

  1. Design and Implementation of an Efficient Multi-version File System

    Microsoft Academic Search

    Xiaojia Xiang; Jiwu Shu; Wei Xue; Weimin Zheng

    2007-01-01

    The benefit of multi-version file system is high reliability. File versioning can be used for file-oriented recovery from deletion and limiting exposure to data losses during file system failure. The problem is that accesses to versions in the distant past may be prohibitively expensive. We adopt the hierarchical architecture in version space to reduce the time spent on search; We

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

    Microsoft Academic Search

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

    1985-01-01

    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

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

    Microsoft Academic Search

    Gene H. Kim; Eugene H. Spafford

    1994-01-01

    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

  4. Scale and performance in a distributed file system

    E-print Network

    John H. Howard; Michael L. Kazar; Sherri G. Menees; A. Nichols; M. Satyanarayanan; Robert N. Sidebotham; Michael J. West

    1988-01-01

    The Andrew File System is a location-transparent distributed tile system that will eventually span more than 5000 workstations at Carnegie Mellon University. Large scale affects performance and complicates system operation. In this paper we present observations of a prototype implementation, motivate changes in the areas of cache validation, server process structure, name translation, and low-level storage representation, and quantitatively demonstrate Andrew’s ability to scale gracefully. We establish the importance of whole-file transfer and caching in Andrew by comparing its performance with that of Sun Microsystem’s NFS tile system. We also show how the aggregation of files into volumes improves the operability of the system.

  5. Scale and performance in a distributed file system

    Microsoft Academic Search

    John H. Howard; Michael L. Kazar; Sherri G. Menees; David A. Nichols; Mahadev Satyanarayanan; Robert N. Sidebotham; Michael J. West

    1988-01-01

    The Andrew File System is a location-transparent distributed tile system that will eventually span more than 5000 workstations at Carnegie Mellon University. Large scale affects performance and complicates system operation. In this paper we present observations of a prototype implementation, motivate changes in the areas of cache validation, server process structure, name translation, and low-level storage representation, and quantitatively demonstrate

  6. Tracking Back References in a Write-Anywhere File System Peter Macko

    E-print Network

    Chen, Yiling

    -Trees and exploiting the write-anywhere behavior of modern file systems such as NetApp R WAFL R or btrfs, we can-disk fragmentation. If two files share a subset of their blocks, it is impossible for both files to have a perfectly is to make reallocation decisions that are aware of block sharing relationships between files and can make

  7. The Spider Center Wide File System; From Concept to Reality

    SciTech Connect

    Shipman, Galen M [ORNL; Dillow, David A [ORNL; Oral, H Sarp [ORNL; Wang, Feiyi [ORNL

    2009-01-01

    The Leadership Computing Facility (LCF) at Oak Ridge National Laboratory (ORNL) has a diverse portfolio of computational resources ranging from a petascale XT4/XT5 simulation system (Jaguar) to numerous other systems supporting development, visualization, and data analytics. In order to support vastly different I/O needs of these systems Spider, a Lustre-based center wide file system was designed and deployed to provide over 240 GB/s of aggregate throughput with over 10 Petabytes of formatted capacity. A multi-stage InfiniBand network, dubbed as Scalable I/O Network (SION), with over 889 GB/s of bisectional bandwidth was deployed as part of Spider to provide connectivity to our simulation, development, visualization, and other platforms. To our knowledge, while writing this paper, Spider is the largest and fastest POSIX-compliant parallel file system in production. This paper will detail the overall architecture of the Spider system, challenges in deploying and initial testings of a file system of this scale, and novel solutions to these challenges which offer key insights into file system design in the future.

  8. Log-Based Directory Resolution in the Coda File System

    Microsoft Academic Search

    Puneet Kumar; Mahadev Satyanarayanan

    1993-01-01

    updates to an object must be treated as conflicting, and Optimistic replication is an important technique for merged manually by the user. Manual resolution is achieving high availability in distributed file systems. A undesirable because it reduces the overall usability of the key problem in optimistic replication is using semantic knowledge of objects to resolve concurrent updates from system. multiple

  9. NCryptfs: A Secure and Convenient Cryptographic File System

    Microsoft Academic Search

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

    2003-01-01

    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.

  10. 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...

  11. File-System Workload on a Scientific Multiprocessor

    NASA Technical Reports Server (NTRS)

    Kotz, David; Nieuwejaar, Nils

    1995-01-01

    Many scientific applications have intense computational and I/O requirements. Although multiprocessors have permitted astounding increases in computational performance, the formidable I/O needs of these applications cannot be met by current multiprocessors a their I/O subsystems. To prevent I/O subsystems from forever bottlenecking multiprocessors and limiting the range of feasible applications, new I/O subsystems must be designed. The successful design of computer systems (both hardware and software) depends on a thorough understanding of their intended use. A system designer optimizes the policies and mechanisms for the cases expected to most common in the user's workload. In the case of multiprocessor file systems, however, designers have been forced to build file systems based only on speculation about how they would be used, extrapolating from file-system characterizations of general-purpose workloads on uniprocessor and distributed systems or scientific workloads on vector supercomputers (see sidebar on related work). To help these system designers, in June 1993 we began the Charisma Project, so named because the project sought to characterize 1/0 in scientific multiprocessor applications from a variety of production parallel computing platforms and sites. The Charisma project is unique in recording individual read and write requests-in live, multiprogramming, parallel workloads (rather than from selected or nonparallel applications). In this article, we present the first results from the project: a characterization of the file-system workload an iPSC/860 multiprocessor running production, parallel scientific applications at NASA's Ames Research Center.

  12. On Benchmarking Embedded Linux Flash File Systems Pierre Olivier

    E-print Network

    Paris-Sud XI, Université de

    characteristics in terms of performance, weight and power consumption, NAND flash memory be- came the main non.8 [Operating Systems]: PerformanceMeasurements Keywords NAND flash memory, Embedded storage, Flash File Sys embedded systems. In this paper we are only concerned with NAND flash memories (designated as flash memory

  13. Assessing Employment Discrimination Charges Filed by Individuals With Psychiatric Disabilities Under the Americans With Disabilities Act

    Microsoft Academic Search

    KATHRYN MOSS; MATTHEW JOHNSEN; MICHAEL ULLMAN

    1998-01-01

    This article presents findings from analyses of nationwide data on employment discrimination charges filed under the Americans With Disabilities Act (ADA). In conducting the analyses, emphasis was placed on understanding the extent to which the ADA charge process differentially affects individuals with psychiatric disabilities. We found that 16.3% of individuals whose charges were closed as of June 30, 1995, received

  14. 19 CFR 191.176 - Procedures for claims filed under 19 U.S.C. 1313(p).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...false Procedures for claims filed under 19 U.S.C. 1313(p). 191.176 Section 191.176 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT...176 Procedures for claims filed under 19 U.S.C. 1313(p). (a)...

  15. 19 CFR 191.176 - Procedures for claims filed under 19 U.S.C. 1313(p).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...false Procedures for claims filed under 19 U.S.C. 1313(p). 191.176 Section 191.176 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT...176 Procedures for claims filed under 19 U.S.C. 1313(p). (a)...

  16. 19 CFR 191.176 - Procedures for claims filed under 19 U.S.C. 1313(p).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...false Procedures for claims filed under 19 U.S.C. 1313(p). 191.176 Section 191.176 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT...176 Procedures for claims filed under 19 U.S.C. 1313(p). (a)...

  17. 19 CFR 191.176 - Procedures for claims filed under 19 U.S.C. 1313(p).

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... Procedures for claims filed under 19 U.S.C. 1313(p). 191.176 Section 191.176 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT... Procedures for claims filed under 19 U.S.C. 1313(p). (a)...

  18. 19 CFR 191.176 - Procedures for claims filed under 19 U.S.C. 1313(p).

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... Procedures for claims filed under 19 U.S.C. 1313(p). 191.176 Section 191.176 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT... Procedures for claims filed under 19 U.S.C. 1313(p). (a)...

  19. Deploying Server-side File System Monitoring at NERSC

    SciTech Connect

    Uselton, Andrew

    2009-05-01

    The Franklin Cray XT4 at the NERSC center was equipped with the server-side I/O monitoring infrastructure Cerebro/LMT, which is described here in detail. Insights gained from the data produced include a better understanding of instantaneous data rates during file system testing, file system behavior during regular production time, and long-term average behaviors. Information and insights gleaned from this monitoring support efforts to proactively manage the I/O infrastructure on Franklin. A simple model for I/O transactions is introduced and compared with the 250 million observations sent to the LMT database from August 2008 to February 2009.

  20. Dealing with the data deluge: file systems and storage technologies

    NASA Astrophysics Data System (ADS)

    Denson, David H.

    2012-06-01

    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.

  1. A file-system-aware FTL design for flash-memory storage systems

    Microsoft Academic Search

    Po-liang Wu; Yuan-hao Chang; Tei-wei Kuo

    2009-01-01

    As flash memory became popular over various platforms, there is a strong demand on the performance degradation problem, due to the special characteristics of flash memory. This research proposes the design of a file-system-aware flash translation layer, in which a filter mechanism is designed to separate the access requests of file-system metadata and file contents for better performance. A recovery

  2. NASIS data base management system: IBM 360 TSS implementation. Volume 6: NASIS message file

    NASA Technical Reports Server (NTRS)

    1973-01-01

    The message file for the NASA Aerospace Safety Information System (NASIS) is discussed. The message file contains all the message and term explanations for the system. The data contained in the file can be broken down into three separate sections: (1) global terms, (2) local terms, and (3) system messages. The various terms are defined and their use within the system is explained.

  3. NASIS data base management system - IBM 360/370 OS MVT implementation. 6: NASIS message file

    NASA Technical Reports Server (NTRS)

    1973-01-01

    The message file for the NASA Aerospace Safety Information System (NASIS) is discussed. The message file contains all the message and term explanations for the system. The data contained in the file can be broken down into three separate sections: (1) global terms, (2) local terms, and (3) system messages. The various terms are defined and their use within the system is explained.

  4. File

    NSDL National Science Digital Library

    With a cover that looks suspiciously like one of the 20th century's most beloved photographic magazines (hint: "File" is an anagram of its moniker), File is an online photography magazine that specializes in "alternate takes, odd angles, unconventional observations". As its makers wryly note, "We leave the Kodak Moments to the family album, the glossy fashion spreads to Vogue, and the photo finishes to ESPN". While the site is relatively new, there is a good deal to browse through here, and visitors can start with a trip to the thematic galleries, and also stop by the contributors section to learn more about each individual photographer. One rather intriguing collection is called "Rustfetish" and features the work of Vince Stinson, whose artistic statement notes that "...these photos prove that by celebrating/the love of rust and all that rusts". The site also includes "Karaoke Camera", in which the editors of the FILE offer a photographic theme or trope, and visitors are encouraged to submit photographs related to that particular idea.

  5. The Spider Center Wide File System; From Concept to Reality

    Microsoft Academic Search

    Galen M. Shipman; David A. Dillow; H Sarp Oral; Feiyi Wang

    2009-01-01

    The Leadership Computing Facility (LCF) at Oak Ridge National Laboratory (ORNL) has a diverse portfolio of computational resources ranging from a petascale XT4\\/XT5 simulation system (Jaguar) to numerous other systems supporting development, visualization, and data analytics. In order to support vastly different I\\/O needs of these systems Spider, a Lustre-based center wide file system was designed and deployed to provide

  6. Scalable locking and recovery for network file systems

    Microsoft Academic Search

    Peter J. Braam

    2007-01-01

    Petascale computing systems pose serious scalability challenges for any data storage system. Lustre is a scalable, secure, robust, highly-available cluster file system that has been successfully deployed on some of the largest supercomputing systems in the world, including the BlueGene\\/L supercomputer at the Lawrence Livermore National Laboratory (LLNL), the Red Storm supercluster at Sandia National Laboratories and the Jaguar supercomputer

  7. 75 FR 1363 - City of Riverside, CA, California Independent System Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-11

    ...EL10-26-000] City of Riverside, CA, California Independent System Operator Corporation; Notice of Filing January...December 22, 2009, City of Riverside, California and the California Independent System Operator Corporation filed its seventh...

  8. 78 FR 79690 - California Independent System Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-31

    ...Commission [Docket No. EL05-146-008] California Independent System Operator Corporation; Notice of Filing Take notice that on December 20, 2013, the California Independent System Operator Corporation (CAISO) filed a refund...

  9. 75 FR 1362 - City of Anaheim, CA, California Independent System Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-11

    ...EL10-25-000] City of Anaheim, CA, California Independent System Operator Corporation; Notice of Filing January...December 22, 2009, City of Anaheim, California and the California Independent System Operator Corporation filed is seventh...

  10. Study of file encryption and decryption system using security key

    Microsoft Academic Search

    Gang Hu

    2010-01-01

    The paper tries to have made a study of the security keys of USB, which can achieve these functions such as data encryption, digital signature, and identity authentication. Based on the analysis of the security key system, the paper also introduces its formation, functions and cryptosystem while putting forward a file encryption project on the basis of the USB security

  11. GLIMPSE: A Tool to Search Through Entire File Systems

    Microsoft Academic Search

    Udi Manber; Sun Wu

    1994-01-01

    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

  12. Designing File Systems for Digital Video and Audio

    Microsoft Academic Search

    P. Venkat Rangan; Harrick M. Vin

    1991-01-01

    We address the unique requirements of a multimedia file system such as continuous storage and retrieval of media, maintenance of synchronization between multiple media streams, and efficient manipulation of huge media objects. We present a model that relates disk and device characteristics to the recording rate, and derive storage abstraction which is a collection of individual media strands tied together

  13. An Empirical Study of a Highly Available File System

    Microsoft Academic Search

    Brian D. Noble; Mahadev Satyanarayanan

    1994-01-01

    In this paper we present results from a six-month empirical study of the high availability aspects of the Coda File System. We report on the service failures experienced by Coda clients, and show that such failures are masked suc- cessfully. We also explore the effectiveness and resource costs of key aspects of server replication and disconnected operation, the two high

  14. The SAS System PHYSICAL FACILITIES SPACE FILE PAGE: 1

    E-print Network

    Fernandez, Eduardo

    The SAS System PHYSICAL FACILITIES SPACE FILE PAGE: 1 PGM = SPAIC V01 - 2014 FLORIDA ATLANTIC ---- ---- ------------- ------------------------- ------------------------ 0001 SC0107. SANSON LIFE SCIENCES BUILDING 162 162 0001 SC0108. SANSON LIFE SCIENCES BUILDING 165 165 0001 SC0109. SANSON LIFE SCIENCES BUILDING 12 12 0001 SC0110. SANSON LIFE SCIENCES BUILDING 11 11 0001

  15. Ceph: A Scalable, High-Performance Distributed File System

    Microsoft Academic Search

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

    2006-01-01

    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,

  16. Volume Based Metadata Isolation in Blue Whale Cluster File System

    Microsoft Academic Search

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

    2009-01-01

    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

  17. VMDFS: Virtual Memory based Mobile Distributed File System

    Microsoft Academic Search

    Susmit Bagchi

    2007-01-01

    The mobile computing paradigm is becoming a reality due to the advent of mobile devices such as, PDA and Smart Phones having wireless interface to WWW. As a result, the high-end applications related to mobile multimedia and distributed digital contents have gained much attention. However, the existing distributed and mobile file systems are not adequately suitable to support such applications

  18. Tracking Back References in a Write-Anywhere File System

    Microsoft Academic Search

    Peter Macko; Margo I. Seltzer; Keith A. Smith

    2010-01-01

    Manyfile systemsreorganizedataon disk, forexampleto defragment storage, shrink volumes, or migrate data be- tween different classes of storage. Advanced file system features such as snapshots, writable clones, and dedupli- cation make these tasks complicated, as moving a single block may require finding and updating dozens, or even hundreds, of pointers to it. We present Backlog, an efficient implementation of explicit back

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

    E-print Network

    A semantic file system for integrated product data management Oliver Eck a, , Dirk Schaefer b online 20 September 2010 Keywords: Information retrieval Semantics Semantic file system Engineering. That is, a formal mathematical model of a new semantic file system, SIL (Semantics Instead of Location

  20. Design and Implementation of a Cryptographic File System for Linux Based on Trusted Computing Platform

    Microsoft Academic Search

    Guo Jin; Li Bo

    2011-01-01

    A prototype system STEFS (Security and Trusted Enhanced File System) of dependability based on trusted computing platform, which can enhanced the security of the file system in Linux, is presented in this paper. Integrating Linux kernel security mechanismand security storage function of TPM (Trusted Platform Module) efficiently, STEFS provides three dynamic loading modules which are not only file encryption and

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

    Microsoft Academic Search

    Steve R. Kleiman

    1986-01-01

    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.

  2. Towards a Secure Dynamic Allocation of Files in Large Scale Distributed File Systems

    E-print Network

    Mei, Alessandro

    a combination of file frag- mentation, replication and encryption techniques. Intuitively, the use of a logarithmic factor of the number of frag- ments of the file. Consider a file F possibly shared by a set of users, and consider an arbitrary assignment of the frag- ments of F to a set of distributed file servers

  3. 26 CFR 301.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 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...

  4. C-5 digital technical order system (G-File)

    Microsoft Academic Search

    R. Major; J. Mera

    1997-01-01

    This paper traces the evolution of the U.S. Air Force C-5 aircraft G-File from a paper based system to a digital technical order system (DTOS). The C-5 DTOS replaced over 275 kilograms (600 pounds) of paper based documentation carried aboard the aircraft with 12 compact discs (CD). More importantly, it allows maintenance personnel to focus totally on aircraft maintenance, by

  5. Structure and Performance of the Direct Access File System

    Microsoft Academic Search

    Kostas Magoutis; Salimah Addetia; Alexandra Fedorova; Margo I. Seltzer; Jeffrey S. Chase; Andrew J. Gallatin; Richard Kisley; Rajiv Wickremesinghe; Eran Gabber

    2002-01-01

    The Direct Access File System (DAFS) is an emerg- ing industrial standard for network-attached stor- age. DAFS takes advantage of new user-level net- work interface standards. This enables a user-level le system structure in which client-side function- ality for remote data access resides in a library rather than in the kernel. This structure addresses longstanding performance problems stemming from weak

  6. Elephant: The File System that Never Forgets Douglas J. Santry, Michael J. Feeley, Norman C. Hutchinson

    E-print Network

    Wiseman, Yair

    Elephant: The File System that Never Forgets Douglas J. Santry, Michael J. Feeley, Norman C to determine which old ver­ sions of a file to retain and for how long. This paper presents the Elephant file system, which pro­ vides users with a new contract: Elephant will automati­ cally retain all important

  7. Metadata management for CDP in object-based file system

    NASA Astrophysics Data System (ADS)

    Yao, Jie; Cao, Qiang; Huang, Jianzhong

    2009-08-01

    Object-based storage system integrates advantage of both NAS and SAN, can be applied in large-capacity, low-cost and large-scale storage systems which are built from commodity devices. 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. An efficient file system optimized for CDP is needed to provide CDP feature in object-based storage system. In this thesis, a new metadata management method is present. All necessary meta data information are recorded when changes happened to file system. We have a journal-like data placement algorithm to store these metadata. Secondly, this metadata management method provides both CDP feature and Object-based feature. Two type write operations are analyzed to reduce storage space consumption. Object-based data allocation algorithm can take the advantage of distributed file system to concurrently process CDP operations over storage nodes. Thirdly, history revisions and recovery operations are discussed. Finally, the experiment test result is present and analyzed.

  8. Distributed PACS using distributed file system with hierarchical meta data servers.

    PubMed

    Hiroyasu, Tomoyuki; Minamitani, Yoshiyuki; Miki, Mitsunori; Yokouchi, Hisatake; Yoshimi, Masato

    2012-01-01

    In this research, we propose a new distributed PACS (Picture Archiving and Communication Systems) which is available to integrate several PACSs that exist in each medical institution. The conventional PACS controls DICOM file into one data-base. On the other hand, in the proposed system, DICOM file is separated into meta data and image data and those are stored individually. Using this mechanism, since file is not always accessed the entire data, some operations such as finding files, changing titles, and so on can be performed in high-speed. At the same time, as distributed file system is utilized, accessing image files can also achieve high-speed access and high fault tolerant. The introduced system has a more significant point. That is the simplicity to integrate several PACSs. In the proposed system, only the meta data servers are integrated and integrated system can be constructed. This system also has the scalability of file access with along to the number of file numbers and file sizes. On the other hand, because meta-data server is integrated, the meta data server is the weakness of this system. To solve this defect, hieratical meta data servers are introduced. Because of this mechanism, not only fault--tolerant ability is increased but scalability of file access is also increased. To discuss the proposed system, the prototype system using Gfarm was implemented. For evaluating the implemented system, file search operating time of Gfarm and NFS were compared. PMID:23367269

  9. Part III: AFS - A Secure Distributed File System

    SciTech Connect

    Wachsmann, A.; /SLAC

    2005-06-29

    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.

  10. An in vitro CT Comparison of Gutta-Percha Removal with Two Rotary Systems and Hedstrom Files

    PubMed Central

    Yadav, Pankaj; Bharath, Makonahalli Jaganath; Sahadev, Chickmagravalli Krishnegowda; Makonahalli Ramachandra, Praveen Kumar; Rao, Yogesh; Ali, Ambereen; Mohamed, Shahnawaz

    2013-01-01

    Introduction To evaluate the efficacy of NiTi mechanical rotary instrumentation and Hedstrom file for gutta-percha/sealer removal computed tomography (CT) was utilized in vitro. Materials and Methods Thirty extracted human single rooted teeth, each with a single canal were selected. The samples were decoronated with a double faced diamond disk to have 17-mm root; teeth roots were instrumented with K-files up to master apical file #30 using step back technique. Samples were obturated using cold lateral condensation of gutta-percha and AH Plus root canal sealer. The teeth were then randomly divided into three groups of 10 specimens each. After 2 weeks 3-dimensional images of the roots were obtained by CT and the volume of root filling mass was measured. All the canals were then retreated by either the ProTaper retreatment files, Mtwo retreatment files or Hedstrom files. The canals were irrigated with 2 mL of 2.5% sodium hypochlorite irrigating solution during each change of instrument. The volume of remaining filling materials after the retreatment procedures was assessed by CT. Statistical analysis was performed with one-way ANOVA and Tukey’s post hoc test. Results Neither of studied systems completely removed the root filling material. No significant difference was observed between the rotary systems. The volume of remaining filling materials was significantly less in rotary instrumentation than hand files. There was no significant difference for debris extruded from the apical foramen between the groups. Conclusion Under the experimental conditions, Mtwo and ProTaper retreatment files left less gutta-percha and sealer than H files; however, complete removal of filling materials was not achieved by the three systems investigated. PMID:23717331

  11. 26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Definitions and special rules for filings under section 1503(d). 1.1503(d)-1 Section 1.1503(d)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

  12. 26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Definitions and special rules for filings under section 1503(d). 1.1503(d)-1 Section 1.1503(d)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

  13. 26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Definitions and special rules for filings under section 1503(d). 1.1503(d)-1 Section 1.1503(d)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

  14. 26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Definitions and special rules for filings under section 1503(d). 1.1503(d)-1 Section 1.1503(d)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

  15. 26 CFR 1.1503(d)-1 - Definitions and special rules for filings under section 1503(d).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Definitions and special rules for filings under section 1503(d). 1.1503(d)-1 Section 1.1503(d)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

  16. 26 CFR 1.6033-6 - Notification requirement for entities not required to file an annual information return under...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...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...

  17. 47 CFR 1.791 - Reports and requests to be filed under part 32 of this chapter.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Reports and requests to be filed under part 32...Complaints, Applications, Tariffs, and Reports Involving Common Carriers Financial and Accounting Reports and Requests § 1.791 Reports...

  18. 47 CFR 1.791 - Reports and requests to be filed under part 32 of this chapter.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Reports and requests to be filed under part 32...Complaints, Applications, Tariffs, and Reports Involving Common Carriers Financial and Accounting Reports and Requests § 1.791 Reports...

  19. 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...

  20. The European Southern Observatory-MIDAS table file system

    NASA Technical Reports Server (NTRS)

    Peron, M.; Grosbol, P.

    1992-01-01

    The new and substantially upgraded version of the Table File System in MIDAS is presented as a scientific database system. MIDAS applications for performing database operations on tables are discussed, for instance, the exchange of the data to and from the TFS, the selection of objects, the uncertainty joins across tables, and the graphical representation of data. This upgraded version of the TFS is a full implementation of the binary table extension of the FITS format; in addition, it also supports arrays of strings. Different storage strategies for optimal access of very large data sets are implemented and are addressed in detail. As a simple relational database, the TFS may be used for the management of personal data files. This opens the way to intelligent pipeline processing of large amounts of data. One of the key features of the Table File System is to provide also an extensive set of tools for the analysis of the final results of a reduction process. Column operations using standard and special mathematical functions as well as statistical distributions can be carried out; commands for linear regression and model fitting using nonlinear least square methods and user-defined functions are available. Finally, statistical tests of hypothesis and multivariate methods can also operate on tables.

  1. File Assignment in Parallel I\\/O Systems with Minimal Variance of Service Time

    Microsoft Academic Search

    Lin-wen Lee; Peter Scheuermann; Radek Vingralek

    2000-01-01

    We address the problem of assigning nonpartitioned files in a parallel I\\/O system where the file accesses exhibit Poisson arrival rates and fixed service times. We present two new file assignment algorithms based on open queuing networks which aim at minimizing simultaneously the load balance across all disks, as well as the variance of the service time at each disk.

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

    NASA Technical Reports Server (NTRS)

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

    1979-01-01

    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.

  3. 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

    2010-07-01

    ...shall be filed via the United States Bankruptcy Courts Case Management/Electronic Case Filing System (CM/ECF) as a “smart form” meaning the forms are data enabled, unless the court offers an automated process that has been approved by EOUST,...

  4. 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

    2011-07-01

    ...shall be filed via the United States Bankruptcy Courts Case Management/Electronic Case Filing System (CM/ECF) as a “smart form” meaning the forms are data enabled, unless the court offers an automated process that has been approved by EOUST,...

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

    E-print Network

    Sheridan, Jennifer

    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

  6. Streaming RAID: a disk array management system for video files

    Microsoft Academic Search

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

    1993-01-01

    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

  7. Concurrent processes of CDP in object-based file system

    NASA Astrophysics Data System (ADS)

    Yao, Jie; Cao, Qiang; Huang, Jianzhong

    2009-08-01

    An object-based storage system - integrating advantages of both NAS and SAN - can be applied in large-capacity, lowcost and large-scale storage systems built from commodity disk devices. The continuous data protection or CDP is a well-known technique that continuously captures or tracks data modifications and stores changes independent of primary data, enabling data recovery - from any point in the past. An efficient file system optimized for CDP plays an important role in object-based storage systems. In this paper, concurrent processes during data backup and data recovery operations are discussed in details. To fully take the advantage of distributed system architectures, we make the concurrent data operations as far as possible during read, write, and recovery processes. A new backup data object placement strategy is present to work in coordination with a replica strategy in object-based distributed file systems. Backup data object can be placed in other object storage servers (or OSS for short) instead of the OSS where the original data is residing, when the backup data object matches certain conditions. For data recovery, we make the related OSSes to concurrently perform data object movement. All these strategies can efficiently reduce system response times.

  8. 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

    2011-04-01

    ... 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 §...

  9. UFO: a personal global file system based on user-level extensions to the operating system

    Microsoft Academic Search

    Albert D. Alexandrov; Maximilian Ibel; Klaus E. Schauser; Chris J. Scheiman

    1998-01-01

    In this article we show how to extend a wide range of functionality of standard operation systems completely at the user level. Our approach works by intercepting selected system calls at the user level, using tracing facilities such as the \\/proc file system provided by many Unix operating systems. The behavior of some intercepted system calls is then modified to

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

    Microsoft Academic Search

    John D. Gould; Stephen J. Boies

    1983-01-01

    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

  11. Aerie: Flexible File-System Interfaces to Storage-Class Memory Haris Volos, Sanketh Nalli, Sankarlingam Panneerselvam,

    E-print Network

    Swift, Michael

    Aerie: Flexible File-System Interfaces to Storage-Class Memory Haris Volos, Sanketh Nalli technology. We present Aerie, a flexible file-system architecture that exposes storage-class memory to user-mode programs so they can access files without kernel interaction. Aerie can implement a generic POSIX-like file

  12. Disk File Management in a Medium-Scale Time-Sharing System.

    ERIC Educational Resources Information Center

    Fitzhugh, Robert J.; Pethia, Richard D.

    The paper descibes a compact and highly efficient disk file management system responsible for the management and allocation of space on moving head disk drives in a medium-scale time-sharing system. The disk file management system is a major component of the Experimental Time-Sharing System (ETSS) developed at the Learning Research and Development…

  13. An Empirical Study of FTL Performance in Conjunction with File System Pursuing Data Integrity

    NASA Astrophysics Data System (ADS)

    Doh, In Hwan; Shim, Myoung Sub; Kim, Eunsam; Choi, Jongmoo; Lee, Donghee; Noh, Sam H.

    Due to the detachability of Flash storage, which is a dominant portable storage, data integrity stored in Flash storages becomes an important issue. This study considers the performance of Flash Translation Layer (FTL) schemes embedded in Flash storages in conjunction with file system behavior that pursue high data integrity. To assure extreme data integrity, file systems synchronously write all file data to storage accompanying hot write references. In this study, we concentrate on the effect of hot write references on Flash storage, and we consider the effect of absorbing the hot write references via nonvolatile write cache on the performance of the FTL schemes in Flash storage. In so doing, we quantify the performance of typical FTL schemes for a realistic digital camera workload that contains hot write references through experiments on a real system environment. Results show that for the workload with hot write references FTL performance does not conform with previously reported studies. We also conclude that the impact of the underlying FTL schemes on the performance of Flash storage is dramatically reduced by absorbing the hot write references via nonvolatile write cache.

  14. Implementing Journaling in a Linux Shared Disk File System

    NASA Technical Reports Server (NTRS)

    Preslan, Kenneth W.; Barry, Andrew; Brassow, Jonathan; Cattelan, Russell; Manthei, Adam; Nygaard, Erling; VanOort, Seth; Teigland, David; Tilstra, Mike; O'Keefe, Matthew; Erickson, Grant; Agarwal, Manish

    2000-01-01

    In computer systems today, speed and responsiveness is often determined by network and storage subsystem performance. Faster, more scalable networking interfaces like Fibre Channel and Gigabit Ethernet provide the scaffolding from which higher performance computer systems implementations may be constructed, but new thinking is required about how machines interact with network-enabled storage devices. In this paper we describe how we implemented journaling in the Global File System (GFS), a shared-disk, cluster file system for Linux. Our previous three papers on GFS at the Mass Storage Symposium discussed our first three GFS implementations, their performance, and the lessons learned. Our fourth paper describes, appropriately enough, the evolution of GFS version 3 to version 4, which supports journaling and recovery from client failures. In addition, GFS scalability tests extending to 8 machines accessing 8 4-disk enclosures were conducted: these tests showed good scaling. We describe the GFS cluster infrastructure, which is necessary for proper recovery from machine and disk failures in a collection of machines sharing disks using GFS. Finally, we discuss the suitability of Linux for handling the big data requirements of supercomputing centers.

  15. Issues in the design and use of a distributed file system

    Microsoft Academic Search

    Howard E. Sturgis; J. Mitchell; J. Israel

    1980-01-01

    This paper discusses an independent file facility, one that is not embedded in an operating system. The distributed file system (DFS) is so named because it is implemented on a cooperating set of server computers connected by a communications, network, which together create the illusion of a single, logical system for the creation, deletion, and random accessing of data. Access

  16. Feasibility of a serverless distributed file system deployed on an existing set of desktop PCs

    Microsoft Academic Search

    William J. Bolosky; John R. Douceur; David Ely; Marvin Theimer

    2000-01-01

    We consider an architecture for a serverless distributed file system that does not assume mutual trust among the client computers. The system provides security, availability, and reliability by distributing multiple encrypted replicas of each file among the client machines. To assess the feasibility of deploying this system on an existing desktop infrastructure, we measure and analyze a large set of

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

    Microsoft Academic Search

    Chengxiang Si; Xiaoxuan Meng; Junwei Zhang; Lu Xu

    2009-01-01

    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

  18. Design, implementation, and benchmarking of a file manager for a relational database management system on a raw UNIX disk

    E-print Network

    Narayanan, Pudugramam Shanker

    1994-01-01

    The file management component of a database management system (DBMS) has to be tailor designed to meet the performance demands of large database applications. The operating system (OS) file systems are typically not suitable for storing...

  19. Extending the Operating System at the User Level: the Ufo Global File System

    Microsoft Academic Search

    Albert D. Alexandrov; Maximilian Ibel; Klaus E. Schauser; Chris J. Scheiman

    1997-01-01

    In this paper we show how to extend the functional- ity of standard operating systems completely at the user level. Our approach works by intercepting selected sys- tem calls at the user level, using tracing facilities such as the \\/proc file system provided by many Unix oper- ating systems. The behavior of some intercepted sys- tem calls is then modified

  20. Ordering and single-file diffusion in colloidal systems

    NASA Astrophysics Data System (ADS)

    Herrera-Velarde, Salvador; Zamudio-Ojeda, Adalberto; Castańeda-Priego, Ramón

    2010-09-01

    The structural properties and the single-file diffusion in one-dimensional interacting colloidal systems are studied by means of Brownian dynamics simulations. We consider three types of particle interactions, namely, Weeks-Chandler-Andersen, screened Coulomb, and superparamagnetic potentials. We find that, regardless of the interaction potential, at low densities particles are distributed in a typical fluidlike structure and at higher densities or potential strengths become spatially correlated at long-distances. Particularly, our findings demonstrate that one-dimensional systems, with particles interacting repulsively, show common structural and dynamical behaviors at the boundary in which the degree of ordering changes dramatically; the main peak of the static structure factor becomes highly narrow with a height of Sc?7, whereas the reduced mobility factor F, which is associated with the single-file diffusion at long-times or long wavelengths, reaches values F??0.1. These features are analyzed and discussed in the context of a local order-disorder transition.

  1. Marching Towards Nirvana: Configurations for Very High Performance Parallel File Systems

    Microsoft Academic Search

    Phil Andrews; Chris Jordan; Wayne Pfeiffer

    2006-01-01

    Over the past 7 years, the San Diego Supercomputer Center has worked to produce the highest possible performance file systems available to the National Science Foundation community in the USA. Most of this was done with GPFS, IBM's parallel file system, but several distinctly different configurations were designed and implemented with numerous lessons learned in the process. All of these

  2. Portals and Networking for the Lustre File System Peter J. Braam, Phil Schwan

    E-print Network

    Brightwell, Ron

    Portals and Networking for the Lustre File System Peter J. Braam, Phil Schwan Cluster File Systems the Portals mes- sage passing API developed by Sandia National Laborato- ries provides a nearly optimal of storage networking features, such as remote DMA and request processing features that Portals allows. 1

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

    E-print Network

    Johnson, Rob

    Exploiting Unix File-System Races via Algorithmic Complexity Attacks Xiang Cai xcai proposed Unix file-system race con- dition defense mechanisms. First, we attack the proba- bilistic defense the kernel-based dynamic race detector of Tsyrklevich and Yee, published at USENIX Security 2003[28]. We

  4. A Proof-Carrying File System Deepak Garg and Frank Pfenning

    E-print Network

    Andrews, Peter B.

    directly, and automatically enforces access control. Proof-carrying authorization (PCA) [7 to provide direct and efficient enforcement of complex access policies. Like PCA, access in the file system and implementation of PCFS, a file system that uses formal proofs and capabilities to efficiently enforce access

  5. Journaling Versus Soft Updates: Asynchronous Meta-data Protection in File Systems

    Microsoft Academic Search

    Margo I. Seltzer; Gregory R. Ganger; Marshall K. Mckusick; A Keith; Craig A. N. Soules; Christopher A. Stein

    2000-01-01

    1 Abstract The UNIX Fast File System (FFS) is probably the most widely-used file system for performance comparisons. However, such comparisons frequently overlook many of the performance enhancements that have been added over the past decade. In this paper, we explore the two most commonly used approaches for improving the performance of meta-data operations and recovery: journaling and Soft Updates.

  6. Security Considerations When Designing a Distributed File System Using Object Storage Devices

    Microsoft Academic Search

    Benjamin C. Reed; Mark A. Smith; Dejan Diklic

    2002-01-01

    We present the design goals that led us to developing a dis- tributed object-based secure file system, Brave. Brave uses mutually authenticated object storage devices, SCARED, to store file system data. Rather than require a new authen- tication infrastructure, we show how we use a simple au- thentication protocol that is bridged into existing securi ty infrastructures, even if there

  7. The Design and Implementation of a Log-Structured File System

    Microsoft Academic Search

    Mendel Rosenblum; John K. Ousterhout

    1991-01-01

    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

  8. Improving File System Reliability with I/O Shepherding Haryadi S. Gunawi

    E-print Network

    Liblit, Ben

    Microsoft Research University of Wisconsin, Madison Silicon Valley {haryadi, swetha, dusseau, remzi}@cs.wisc.edu, vijayanp@microsoft.com ABSTRACT We introduce a new reliability infrastructure for file systems called I, and evaluation of a new reliability infrastructure for file systems called I/O shepherding. I/O shepherding

  9. Derived virtual devices: a secure distributed file system mechanism

    NASA Technical Reports Server (NTRS)

    VanMeter, Rodney; Hotz, Steve; Finn, Gregory

    1996-01-01

    This paper presents the design of derived virtual devices (DVDs). DVDs are the mechanism used by the Netstation Project to provide secure shared access to network-attached peripherals distributed in an untrusted network environment. DVDs improve Input/Output efficiency by allowing user processes to perform I/O operations directly from devices without intermediate transfer through the controlling operating system kernel. The security enforced at the device through the DVD mechanism includes resource boundary checking, user authentication, and restricted operations, e.g., read-only access. To illustrate the application of DVDs, we present the interactions between a network-attached disk and a file system designed to exploit the DVD abstraction. We further discuss third-party transfer as a mechanism intended to provide for efficient data transfer in a typical NAP environment. We show how DVDs facilitate third-party transfer, and provide the security required in a more open network environment.

  10. The Bittorrent P2P File-Sharing System: Measurements and Analysis

    Microsoft Academic Search

    Johan A. Pouwelse; Pawel Garbacki; Dick H. J. Epema; Henk J. Sips

    2005-01-01

    Of the many P2P file-sharing prototypes in existence, Bit- Torrent is one of the few that has managed to attract millions of users. BitTorrent relies on other (global) components for file search, employs a moderator system to ensure the integrity of file data, and uses a barter- ing technique for downloading in order to prevent users from freeriding. In this

  11. Evaluating the Shared Root File System Approach for Diskless High-Performance Computing Systems

    SciTech Connect

    Engelmann, Christian [ORNL; Ong, Hong Hoe [ORNL; Scott, Stephen L [ORNL

    2009-01-01

    Diskless high-performance computing (HPC) systems utilizing networked storage have become popular in the last several years. Removing disk drives significantly increases compute node reliability as they are known to be a major source of failures. Furthermore, networked storage solutions utilizing parallel I/O and replication are able to provide increased scalability and availability. Reducing a compute node to processor(s), memory and network interface(s) greatly reduces its physical size, which in turn allows for large-scale dense HPC solutions. However, one major obstacle is the requirement by certain operating systems (OSs), such as Linux, for a root file system. While one solution is to remove this requirement from the OS, another is to share the root file system over the networked storage. This paper evaluates three networked file system solutions, NFSv4, Lustre and PVFS2, with respect to their performance, scalability, and availability features for servicing a common root file system in a diskless HPC configuration. Our findings indicate that Lustre is a viable solution as it meets both, scaling and performance requirements. However, certain availability issues regarding single points of failure and control need to be considered.

  12. 26 CFR 1.6033-4 - Required use of magnetic media for returns by organizations required to file returns under...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 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...

  13. 12 CFR 516.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OTS Review Expedited Treatment § 516.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  14. 12 CFR 116.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OCC Review Expedited Treatment § 116.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  15. 12 CFR 516.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OTS Review Expedited Treatment § 516.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  16. 12 CFR 116.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OCC Review Expedited Treatment § 116.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  17. 12 CFR 516.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OTS Review Expedited Treatment § 516.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  18. 12 CFR 516.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OTS Review Expedited Treatment § 516.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  19. 12 CFR 516.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OTS Review Expedited Treatment § 516.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  20. 12 CFR 116.200 - If I file a notice under expedited treatment, when may I engage in the proposed activities?

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... If I file a notice under expedited treatment, when may I engage in the proposed activities...PROCESSING PROCEDURES OCC Review Expedited Treatment § 116.200 If I file a notice under expedited treatment, when may I engage in the proposed...

  1. 75 FR 39243 - California Independent System; Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-08

    ...ER10-1634-000] California Independent System; Operator Corporation; Notice...June 29, 2010, the California Independent System Operator Corporation (CAISO) and the City of Riverside, California (Riverside) filed...

  2. 78 FR 25740 - Meridian Energy USA, Inc. v. California Independent System Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-02

    ...ER13-1333-000] Meridian Energy USA, Inc. v. California Independent System Operator Corporation; Notice of Filing Take notice...a limited waiver of Appendix Y of the California Independent System Operator Corp. (CAISO) tariff to defer the...

  3. Building a User-level Direct Access File System over Infiniband

    E-print Network

    Iftode, Liviu

    Building a User-level Direct Access File System over Infiniband Murali Rangarajan and Liviu Iftode.rutgers.edu Abstract-- In this paper, we present the design and implementation of a user-space Direct Access File API (VAPI) and the User Direct Access Programming Library (uDAPL). We present an implementation

  4. The CIMARON System: Modular Programs for the Organization and Search of Large Files. Final Report.

    ERIC Educational Resources Information Center

    Aiyer, Arjun K.

    The File Organization Project has made available a set of programs which are designed to operate on large files of machine readable bibliographic records. These programs are designed as an instrument for understanding and refining the techniques of bibliographic search. This document discusses four aspects of the system: (1) The retrieval program,…

  5. Development of a user-centered radiology teaching file system

    NASA Astrophysics Data System (ADS)

    dos Santos, Marcelo; Fujino, Asa

    2011-03-01

    Learning radiology requires systematic and comprehensive study of a large knowledge base of medical images. In this work is presented the development of a digital radiology teaching file system. The proposed system has been created in order to offer a set of customized services regarding to users' contexts and their informational needs. This has been done by means of an electronic infrastructure that provides easy and integrated access to all relevant patient data at the time of image interpretation, so that radiologists and researchers can examine all available data to reach well-informed conclusions, while protecting patient data privacy and security. The system is presented such as an environment which implements a distributed clinical database, including medical images, authoring tools, repository for multimedia documents, and also a peer-reviewed model which assures dataset quality. The current implementation has shown that creating clinical data repositories on networked computer environments points to be a good solution in terms of providing means to review information management practices in electronic environments and to create customized and contextbased tools for users connected to the system throughout electronic interfaces.

  6. An Empirical Study of Free-Riding Behavior in the Maze P2P File-Sharing System

    Microsoft Academic Search

    Mao Yang; Zhengyou Zhang; Xiaoming Li; Yafei Dai

    2005-01-01

    Maze1 is a P2P file-sharing system with an active and large user base. It is developed, deployed and op- erated by an academic research team. As such, it offers ample opportunities to conduct experiments to under- stand user behavior. Embedded in Maze is a set of in- centive policies designed to encourage sharing and contribution. This paper presents an in-depth

  7. A resources monitoring architecture for P2P file-sharing systems

    NASA Astrophysics Data System (ADS)

    Wang, Wenxian; Chen, Xingshu; Wang, Haizhou

    2013-07-01

    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.

  8. Toward Millions of File System IOPS on Low-Cost, Commodity Hardware.

    PubMed

    Zheng, Da; Burns, Randal; Szalay, Alexander S

    2013-01-01

    We describe a storage system that removes I/O bottlenecks to achieve more than one million IOPS based on a user-space file abstraction for arrays of commodity SSDs. The file abstraction refactors I/O scheduling and placement for extreme parallelism and non-uniform memory and I/O. The system includes a set-associative, parallel page cache in the user space. We redesign page caching to eliminate CPU overhead and lock-contention in non-uniform memory architecture machines. We evaluate our design on a 32 core NUMA machine with four, eight-core processors. Experiments show that our design delivers 1.23 million 512-byte read IOPS. The page cache realizes the scalable IOPS of Linux asynchronous I/O (AIO) and increases user-perceived I/O performance linearly with cache hit rates. The parallel, set-associative cache matches the cache hit rates of the global Linux page cache under real workloads. PMID:24402052

  9. NVFAT: A FAT-Compatible File System with NVRAM Write Cache for Its Metadata

    NASA Astrophysics Data System (ADS)

    Doh, In Hwan; Lee, Hyo J.; Moon, Young Je; Kim, Eunsam; Choi, Jongmoo; Lee, Donghee; Noh, Sam H.

    File systems make use of the buffer cache to enhance their performance. Traditionally, part of DRAM, which is volatile memory, is used as the buffer cache. In this paper, we consider the use of of Non-Volatile RAM (NVRAM) as a write cache for metadata of the file system in embedded systems. NVRAM is a state-of-the-art memory that provides characteristics of both non-volatility and random byte addressability. By employing NVRAM as a write cache for dirty metadata, we retain the same integrity of a file system that always synchronously writes its metadata to storage, while at the same time improving file system performance to the level of a file system that always writes asynchronously. To show quantitative results, we developed an embedded board with NVRAM and modify the VFAT file system provided in Linux 2.6.11 to accommodate the NVRAM write cache. We performed a wide range of experiments on this platform for various synthetic and realistic workloads. The results show that substantial reductions in execution time are possible from an application viewpoint. Another consequence of the write cache is its benefits at the FTL layer, leading to improved wear leveling of Flash memory and increased energy savings, which are important measures in embedded systems. From the real numbers obtained through our experiments, we show that wear leveling is improved considerably and also quantify the improvements in terms of energy.

  10. A File Location, Replication, and Distribution System for Network Information to Aid Network Management

    E-print Network

    Cheng, Tiffany

    2010-09-22

    This thesis demonstrates and evaluates the design, architecture, and implementation of a file location, replication, and distribution system built with the objective of managing information in an Internet network. The ...

  11. A file location, replication, and distribution system for network information to aid network management

    E-print Network

    Cheng, Tiffany (Tiffany R.)

    2010-01-01

    This thesis demonstrates and evaluates the design, architecture, and implementation of a file location, replication, and distribution system built with the objective of managing information in an Internet network. The ...

  12. Using Hadoop File System and MapReduce in a small/medium Grid site

    NASA Astrophysics Data System (ADS)

    Riahi, H.; Donvito, G.; Fanň, L.; Fasi, M.; Marzulli, G.; Spiga, D.; Valentini, A.

    2012-12-01

    Data storage and data access represent the key of CPU-intensive and data-intensive high performance Grid computing. Hadoop is an open-source data processing framework that includes fault-tolerant and scalable distributed data processing model and execution environment, named MapReduce, and distributed File System, named Hadoop distributed File System (HDFS). HDFS was deployed and tested within the Open Science Grid (OSG) middleware stack. Efforts have been taken to integrate HDFS with gLite middleware. We have tested the File System thoroughly in order to understand its scalability and fault-tolerance while dealing with small/medium site environment constraints. To benefit entirely from this File System, we made it working in conjunction with Hadoop Job scheduler to optimize the executions of the local physics analysis workflows. The performance of the analysis jobs which used such architecture seems to be promising, making it useful to follow up in the future.

  13. 75 FR 15429 - San Diego Gas & Electric Co.; California Independent System Operator; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-29

    ...Regulatory Commission [Docket Nos. EL00-95-229; EL00-98-214] San Diego Gas & Electric Co.; California Independent System Operator; Notice of Filing March 22, 2010. Take notice that on July 20, 2009, Avista Energy, Inc....

  14. Anesthetic Cartridge System Under Evaluation

    PubMed Central

    Cooley, Robert L.; Lubow, Richard M.

    1981-01-01

    The problem of glass breakage in the local anesthetic cartridge system was evaluated under laboratory conditions with a mechanical testing machine. The anticipated breakage of the glass did not occur with any frequency, as the rubber stopper produced more uniform failures of the system. The glass cartridge appeared to be quite reliable and resistant to breakage. Local anesthetics have been used for many years to provide patients temporary freedom from pain. Local anesthetic solutions are in wide use in both dentistry and medicine and are the most frequently used drugs in dentistry. Various estimates place the number of injections at approximately one half million daily or 125 million injections per year. These drugs and the armamentarium necessary to administer them have proven to be safe and reliable. Only rarely are there reports of sensitivity to the anesthetic solution or breakage of needles.. Sterility of the solutions has not been a problem as they are carefully processed and evaluated at the factory. Although there are sporadic reports of loss of sterility, this has been attributed to the reuse of the anesthetic cartridges on more than one patient. Monheim states “The success of the cartridge system in dentistry has been due to the sincerity, honesty, and high standards of the manufacturers in giving the profession a near-perfect product.” However, on occassion a glass cartridge will break or shatter when inserting the harpoon into the rubber stopper or even during injection. Cooley et al reported on eye injuries occurring in the dental office, one of which was due to glass from a local anesthetic cartridge that exploded and propelled particles into the patient's eye. Forrest evaluated syringes, needles, and cartridges and reported that one brand (made in Britain) fractured more often than any other, but that the fracture rate was too low to be of any consequence. It is apparent that glass cartridges will fracture or burst from time to time. This study evaluates the cartridge system with carefully controlled laboratory procedures. The cartridges were tested under various pressures and conditions in an attempt to determine the causes of failure and when such failure may be anticipated. ImagesFigure 1Figure 2Figure 3Figure 4Figure 9Figure 10 PMID:6939350

  15. Denial-of-service resilience in peer-to-peer file sharing systems

    Microsoft Academic Search

    D. Dumitriu; E. Knightly; A. Kuzmanovic; I. Stoica; W. Zwaenepoel

    2005-01-01

    Peer-to-peer (p2p) file sharing systems are characterized by highly replicated content distributed among nodes with enormous aggregate resources for storage and communication. These properties alone are not sufficient, however, to render p2p networks immune to denial-of-service (DoS) attack. In this paper, we study, by means of analytical modeling and simulation, the resilience of p2p file sharing systems against DoS attacks,

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

    SciTech Connect

    Hick, Jason; Hules, John; Uselton, Andrew

    2011-11-30

    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.

  17. A Hybrid Flash File System Based on NOR and NAND Flash Memories for Embedded Devices

    Microsoft Academic Search

    Chul Lee; Sung Hoon Baek; Kyu Ho Park

    2008-01-01

    This paper presents a hybrid flash file system (HFFS) based on both NOR flash and NAND flash memory. In a conventional NAND flash-based flash file system, there is a trade-off between life span and durability in the frequent writing of small amounts of data. Because NAND flash supports only a page-level I\\/O, at least one page is wasted in the

  18. 77 FR 7141 - Combined Notice of Filings #2

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-10

    ...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...

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

    SciTech Connect

    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

    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.

  20. 20 CFR 429.202 - How do I file a claim under this subpart?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...occurred while you were transporting your property or using a motor vehicle...insurance contracts, whether in your name or in the name of the responsible party. ...someone else files the claim on your behalf. (4) A statement...

  1. Defeating Encrypted and Deniable File Systems: TrueCrypt v5.1a and the Case of the Tattling OS and Applications

    E-print Network

    Gribble, Steve

    configuration might be as follows: Al- ice creates a regular (non-deniable) encrypted file system on her laptop, protected by some password she knows. Inside that encrypted file system, she has the option to also create a deniable file system, protected by a second password. TrueCrypt refers to these inner, deniable file

  2. Object and File Management in the EXODUS Extensible Database System

    Microsoft Academic Search

    Michael J. Carey; David J. Dewitt; Joel E. Richardson; Eugene J. Shekita

    1986-01-01

    ABSTRACT,provided by no commercial database system at this time). Storing This paper describes the design of the object-oriented storage component of EXODUS, an extensible database manaaement~svstern currently under development,at the University of-Wiscon&t. The basic abstraction in the EXODU’S storage system is the storage object, an uninterpmted variable-length m&z& of arbitrary size; higher level abstractions such as records and indices am

  3. Performance of the engineering analysis and data system 2 common file system

    NASA Technical Reports Server (NTRS)

    Debrunner, Linda S.

    1993-01-01

    The Engineering Analysis and Data System (EADS) was used from April 1986 to July 1993 to support large scale scientific and engineering computation (e.g. computational fluid dynamics) at Marshall Space Flight Center. The need for an updated system resulted in a RFP in June 1991, after which a contract was awarded to Cray Grumman. EADS II was installed in February 1993, and by July 1993 most users were migrated. EADS II is a network of heterogeneous computer systems supporting scientific and engineering applications. The Common File System (CFS) is a key component of this system. The CFS provides a seamless, integrated environment to the users of EADS II including both disk and tape storage. UniTree software is used to implement this hierarchical storage management system. The performance of the CFS suffered during the early months of the production system. Several of the performance problems were traced to software bugs which have been corrected. Other problems were associated with hardware. However, the use of NFS in UniTree UCFM software limits the performance of the system. The performance issues related to the CFS have led to a need to develop a greater understanding of the CFS organization. This paper will first describe the EADS II with emphasis on the CFS. Then, a discussion of mass storage systems will be presented, and methods of measuring the performance of the Common File System will be outlined. Finally, areas for further study will be identified and conclusions will be drawn.

  4. Performance of file directory systems for data bases in star and distributed networks

    Microsoft Academic Search

    Wesley W. Chu

    1976-01-01

    Three classes of file directories for distributed data bases are studied: The centralized directory system, the local directory system, and the distributed directory system. The parameters considered are communication cost, storage cost, code translation cost, query rate, update rate, directory size, and directory response time. This study reports the cost performance tradeoffs of these three classes of directory systems in

  5. A Peer-to-Peer File Resource Sharing System for Mobile Devices

    Microsoft Academic Search

    Chao-Tung Yang; Chun-Jen Chen; Hung-Yen Chen; Ching-Hsien Hsu

    2008-01-01

    In this paper, we present a peer-to-peer file sharing platform combined with data grid system for mobile devices. Facing the limit of network bandwidth and unstable signal strength in wireless network, wireless peer-to-peer architecture is now widely accepted as a new computing paradigm for wireless devices. In wireless P2P architecture, one can speedup parallel file transfer and enhance the communication

  6. Characterizing unstructured overlay topologies in modern P2P file-sharing systems

    Microsoft Academic Search

    Daniel Stutzbach; Reza Rejaie; Subhabrata Sen

    2008-01-01

    In recent years, peer-to-peer (P2P) file-sharing systems have evolved to accommodate growing numbers of participating peers. In particular, new features have changed the properties of the unstructured overlay topologies formed by these peers. Little is known about the characteristics of these topologies and their dynamics in modern file-sharing applications, despite their importance. This paper presents a detailed characterization of P2P

  7. Distributed File System Virtualization Techniques Supporting On-Demand Virtual Machine Environments for Grid Computing

    Microsoft Academic Search

    Ming Zhao; Jian Zhang; Renato J. O. Figueiredo

    2006-01-01

    This paper presents a data management solution which allows fast Virtual Machine (VM) instantiation and efficient run-time execution to support VMs as execution environments in Grid computing. It is based on novel distributed file system virtualization techniques and is unique in that: (1) it provides on-demand cross-domain access to VM state for unmodified VM monitors; (2) it enables private file

  8. A Lightweight, Temporary File System for Large-scale Web Servers

    Microsoft Academic Search

    Jun Wang; Dong Li

    2003-01-01

    Several recent studies have pointed out that file I\\/Os can be a ma- jor performance bottleneck for some large Web servers. Large I\\/O buffer caches often do not work effectively for large servers. This paper presents a novel, light-weight, temporary file system called TFS that can effectively improve I\\/O performance for large servers with minimal cost. TFS is a much

  9. Security in the CernVM File System and the Frontier Distributed Database Caching System

    NASA Astrophysics Data System (ADS)

    Dykstra, D.; Blomer, J.

    2014-06-01

    Both the CernVM File System (CVMFS) and the Frontier Distributed Database Caching System (Frontier) distribute centrally updated data worldwide for LHC experiments using http proxy caches. Neither system provides privacy or access control on reading the data, but both control access to updates of the data and can guarantee the authenticity and integrity of the data transferred to clients over the internet. CVMFS has since its early days required digital signatures and secure hashes on all distributed data, and recently Frontier has added X.509-based authenticity and integrity checking. In this paper we detail and compare the security models of CVMFS and Frontier.

  10. 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

    2010-04-01

    ...false 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...

  11. MRAM and Red-Black Trees: Exploring Alternative Data Structures for Low-level File System Management

    Microsoft Academic Search

    Damian Eads

    The study of algorithms and data structures for low-level file system management is a well-explored research topic. File system data structures must be persistent across re- boots. This has constrained the research of low-level file system management to algorithms which operate on disk- based structures. The advent of low latency, non-volatile memories such as Magnetic Random Access Memory (MRAM) justify

  12. 43 CFR 3809.313 - Under what circumstances may I not begin operations 15 calendar days after filing my notice?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...circumstances may I not begin operations 15 calendar days after filing my notice? ...circumstances may I not begin operations 15 calendar days after filing my notice? ...you may not begin operations 15 calendar days after filing your...

  13. 43 CFR 3809.313 - Under what circumstances may I not begin operations 15 calendar days after filing my notice?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...circumstances may I not begin operations 15 calendar days after filing my notice? ...circumstances may I not begin operations 15 calendar days after filing my notice? ...you may not begin operations 15 calendar days after filing your...

  14. 43 CFR 3809.313 - Under what circumstances may I not begin operations 15 calendar days after filing my notice?

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...circumstances may I not begin operations 15 calendar days after filing my notice? ...circumstances may I not begin operations 15 calendar days after filing my notice? ...you may not begin operations 15 calendar days after filing your...

  15. 43 CFR 3809.313 - Under what circumstances may I not begin operations 15 calendar days after filing my notice?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...circumstances may I not begin operations 15 calendar days after filing my notice? ...circumstances may I not begin operations 15 calendar days after filing my notice? ...you may not begin operations 15 calendar days after filing your...

  16. Handheld access to radiology teaching files: an automated system for format conversion and content creation

    NASA Astrophysics Data System (ADS)

    Raman, Raghav; Raman, Lalithakala; Raman, Bhargav; Gold, Garry; Beaulieu, Christopher F.

    2002-05-01

    Current handheld Personal Digital Assistants (PDAs) can be used to view radiology teaching files. We have developed a toolkit that allows rapid creation of radiology teaching files in handheld formats from existing repositories. Our toolkit incorporated a desktop converter, a web conversion server and an application programming interface (API). Our API was integrated with an existing pilot teaching file database. We evaluated our system by obtaining test DICOM and JPEG images from our PACS system, our pilot database and from personal collections and converting them on a Windows workstation (Microsoft, Redmond, CA) and on other platforms using the web server. Our toolkit anonymized, annotated and categorized images using DICOM header information and data entered by the authors. Image processing was automatically customized for the target handheld device. We used freeware handheld image viewers as well as our custom applications that allowed window/level manipulation and viewing of additional textual information. Our toolkit provides desktop and web access to image conversion tools to produce organized handheld teaching file packages for most handheld devices and our API allows existing teaching file databases to incorporate handheld compatibility. The distribution of radiology teaching files on PDAs can increase the accessibility to radiology teaching.

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

    Microsoft Academic Search

    Kevin M. Greenan; Ethan L. Miller

    2006-01-01

    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

  18. A Universal File Server

    Microsoft Academic Search

    Andrew Birrell; Roger M. Needham

    1980-01-01

    A file server is a utility provided in a computer connected via a local communications network to a number of other computer. File servers exist to preserve material for the benefit of client machines or systems. It is desirable for a file server to be able to support multiple file directory and access management systems, so that the designer of

  19. High performance file compression algorithm for video-on-demand e-learning system

    NASA Astrophysics Data System (ADS)

    Nomura, Yoshihiko; Matsuda, Ryutaro; Sakamoto, Ryota; Sugiura, Tokuhiro; Matsui, Hirokazu; Kato, Norihiko

    2005-10-01

    Information processing and communication technology are progressing quickly, and are prevailing throughout various technological fields. Therefore, the development of such technology should respond to the needs for improvement of quality in the e-learning education system. The authors propose a new video-image compression processing system that ingeniously employs the features of the lecturing scene: recognizing the a lecturer and a lecture stick by pattern recognition techniques, the video-image compression processing system deletes the figure of a lecturer of low importance and displays only the end point of a lecture stick. It enables us to create the highly compressed lecture video files, which are suitable for the Internet distribution. We compare this technique with the other simple methods such as the lower frame-rate video files, and the ordinary MPEG files. The experimental result shows that the proposed compression processing system is much more effective than the others.

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

    E-print Network

    Cui, Jun-Hong

    , P2P file sharing systems are probably the fastest growing and the most popular In- ternet or part of this work for personal or classroom use is granted without fee provided that copies in the system ac- cordingly. For example, we set up several rules to compare the node entries: for any two

  1. A Next-Generation Parallel File System Environment for the OLCF

    SciTech Connect

    Dillow, David A [ORNL; Fuller, Douglas [ORNL; Gunasekaran, Raghul [ORNL; Kim, Youngjae [ORNL; Oral, H Sarp [ORNL; Reitz, Doug M [ORNL; Simmons, James A [ORNL; Wang, Feiyi [ORNL; Shipman, Galen M [ORNL; Hill, Jason J [ORNL

    2012-01-01

    When deployed in 2008/2009 the Spider system at the Oak Ridge National Laboratory s Leadership Computing Facility (OLCF) was 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, Spider has since become a blueprint for shared Lustre environments deployed worldwide. Designed to support the parallel I/O requirements of the Jaguar XT5 system and other smallerscale platforms at the OLCF, the upgrade to the Titan XK6 heterogeneous system will begin to push the limits of Spider s original design by mid 2013. With a doubling in total system memory and a 10x increase in FLOPS, Titan will require both higher bandwidth and larger total capacity. Our goal is to provide a 4x increase in total I/O bandwidth from over 240GB=sec today to 1TB=sec and a doubling in total capacity. While aggregate bandwidth and total capacity remain important capabilities, an equally important goal in our efforts is dramatically increasing metadata performance, currently the Achilles heel of parallel file systems at leadership. We present in this paper an analysis of our current I/O workloads, our operational experiences with the Spider parallel file systems, the high-level design of our Spider upgrade, and our efforts in developing benchmarks that synthesize our performance requirements based on our workload characterization studies.

  2. Providing Asynchronous File I/O for the Plan 9 Operating System

    E-print Network

    Gummadi, Ramakrishna

    been possible. Russ provided the Plan 9 kernel modifications used to export the network device and ranProviding Asynchronous File I/O for the Plan 9 Operating System by Jason Hickey Submitted/O for the Plan 9 Operating System by Jason M. Hickey Submitted to the Department of Electrical Engineering

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

    PubMed Central

    Metzger, Zvi

    2014-01-01

    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

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

    SciTech Connect

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

    1992-10-01

    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.

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

    SciTech Connect

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

    1992-01-01

    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.

  6. A convertor and user interface to import CAD files into worldtoolkit virtual reality systems

    NASA Technical Reports Server (NTRS)

    Wang, Peter Hor-Ching

    1996-01-01

    Virtual Reality (VR) is a rapidly developing human-to-computer interface technology. VR can be considered as a three-dimensional computer-generated Virtual World (VW) which can sense particular aspects of a user's behavior, allow the user to manipulate the objects interactively, and render the VW at real-time accordingly. The user is totally immersed in the virtual world and feel the sense of transforming into that VW. NASA/MSFC Computer Application Virtual Environments (CAVE) has been developing the space-related VR applications since 1990. The VR systems in CAVE lab are based on VPL RB2 system which consists of a VPL RB2 control tower, an LX eyephone, an Isotrak polhemus sensor, two Fastrak polhemus sensors, a folk of Bird sensor, and two VPL DG2 DataGloves. A dynamics animator called Body Electric from VPL is used as the control system to interface with all the input/output devices and to provide the network communications as well as VR programming environment. The RB2 Swivel 3D is used as the modelling program to construct the VW's. A severe limitation of the VPL VR system is the use of RB2 Swivel 3D, which restricts the files to a maximum of 1020 objects and doesn't have the advanced graphics texture mapping. The other limitation is that the VPL VR system is a turn-key system which does not provide the flexibility for user to add new sensors and C language interface. Recently, NASA/MSFC CAVE lab provides VR systems built on Sense8 WorldToolKit (WTK) which is a C library for creating VR development environments. WTK provides device drivers for most of the sensors and eyephones available on the VR market. WTK accepts several CAD file formats, such as Sense8 Neutral File Format, AutoCAD DXF and 3D Studio file format, Wave Front OBJ file format, VideoScape GEO file format, Intergraph EMS stereolithographics and CATIA Stereolithographics STL file formats. WTK functions are object-oriented in their naming convention, are grouped into classes, and provide easy C language interface. Using a CAD or modelling program to build a VW for WTK VR applications, we typically construct the stationary universe with all the geometric objects except the dynamic objects, and create each dynamic object in an individual file.

  7. Fair File Swarming with FOX

    Microsoft Academic Search

    Dave Levin; Rob Sherwood; Bobby Bhattacharjee

    File swarming is a popular method of coordinated download by which peers obtain a le from an under›provisioned server. Criti› cal problems arise within this domain when users act selshly , yet most systems are built with altruism assumed. Working under the assumption that all peers are greedy, we introduce the Fair, Opti› mal eXchange (FOX) protocol. FOX, in addition

  8. Electrochemical Impedance Spectroscopy Investigation on the Clinical Lifetime of ProTaper Rotary File System

    PubMed Central

    Pirvu, Cristian; Demetrescu, Ioana

    2014-01-01

    The main objective of the current paper is to show that electrochemical impedance spectroscopy (EIS) could be a method for evaluating and predicting of ProTaper rotary file system clinical lifespan. This particular aspect of everyday use of the endodontic files is of great importance in each dental practice and has profound clinical implications. The method used for quantification resides in the electrochemical impedance spectroscopy theory and has in its main focus the characteristics of the surface titanium oxide layer. This electrochemical technique has been adapted successfully to identify the quality of the Ni-Ti files oxide layer. The modification of this protective layer induces changes in corrosion behavior of the alloy modifying the impedance value of the file. In order to assess the method, 14 ProTaper sets utilized on different patients in a dental clinic have been submitted for testing using EIS. The information obtained in regard to the surface oxide layer has offered an indication of use and proves that the said layer evolves with each clinical application. The novelty of this research is related to an electrochemical technique successfully adapted for Ni-Ti file investigation and correlation with surface and clinical aspects. PMID:24605336

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

    E-print Network

    Wu, Jie

    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

  10. CMU-ITC-88-062 An Overview of the Andrew File System

    E-print Network

    Carnegie Mellon University ABSTRACT Andrew is a distributed computing environment being developed in a joint pro- ject by Carnegie Mellon University and IBM. One of the major components of AndrewCMU-ITC-88-062 An Overview of the Andrew File System John H Howard Information Technology Center

  11. The Panda Array I/O library on the Galley Parallel File System

    E-print Network

    1 The Panda Array I/O library on the Galley Parallel File System Joel T. Thomas Dartmouth Computer Joel.T.Thomas@dartmouth.edu June 5, 1996 Abstract The Panda Array I/O library, created some time, and the Panda project is an attempt to ameliorate this problem while still providing

  12. MFS: an Adaptive Distributed File System for Mobile Hosts Benjamin Atkin and Kenneth P. Birman

    E-print Network

    Birman, Kenneth P.

    MFS: an Adaptive Distributed File System for Mobile Hosts Benjamin Atkin and Kenneth P. Birman techniques for management of data accessed and modified by mobile hosts. We investigate adaptation on mobile hosts lack flexible mechanisms for data access in an en- vironment with large and frequent

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

    SciTech Connect

    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

    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.

  14. Adding Aggressive Error Correction to a High-Performance Compressing Flash File System

    E-print Network

    Miller, Ethan L.

    Research Center University of California, Santa Cruz elm@cs.ucsc.edu ABSTRACT While NAND flash memories resistance and non-volatility. The recent development of multi-level cell (MLC) NAND flash memory provides scale to multiple gigabytes. We have developed a flash memory file system, RCFFS, that increases

  15. A File System Design for the Aeolus Security Platform Francis Peter McKee

    E-print Network

    of Engineering in Electrical Engineering and Computer Science Abstract This thesis presents the designA File System Design for the Aeolus Security Platform by Francis Peter McKee S.B., C.S. M.I.T., 2011 Submitted to the Department of Electrical Engineering and Computer Science in Partial Fulfillment

  16. Building and Evaluating a k-Resilient Mobile Distributed File System Resistant to Device

    E-print Network

    Xie, Geoffrey

    the security of data at rest in military mobile phone MANETs, we develop and evaluate a prototype k- resilientBuilding and Evaluating a k-Resilient Mobile Distributed File System Resistant to Device Compromise-established cryptographic primitives, combining them in a unique way to meet military mission specific security and re

  17. Improving File System Reliability with I/O Shepherding Haryadi S. Gunawi # , Vijayan Prabhakaran + , Swetha Krishnan # ,

    E-print Network

    Liblit, Ben

    Sciences + Microsoft Research University of Wisconsin, Madison Silicon Valley {haryadi, swetha, dusseau, remzi}@cs.wisc.edu, vijayanp@microsoft.com ABSTRACT We introduce a new reliability infrastructure the design, implementation, and evaluation of a new reliability infrastructure for file systems called I

  18. DSSTox EPA Integrated Risk Information System Structure-Index Locator File: SDF File and Documentation

    EPA Science Inventory

    EPA's Integrated Risk Information System (IRIS) database was developed and is maintained by EPA's Office of Research and Developement, National Center for Environmental Assessment. IRIS is a database of human health effects that may result from exposure to various substances fou...

  19. Creating Interactive Graphical Overlays in the Advanced Weather Interactive Processing System Using Shapefiles and DGM Files

    NASA Technical Reports Server (NTRS)

    Barrett, Joe H., III; Lafosse, Richard; Hood, Doris; Hoeth, Brian

    2007-01-01

    Graphical overlays can be created in real-time in the Advanced Weather Interactive Processing System (AWIPS) using shapefiles or Denver AWIPS Risk Reduction and Requirements Evaluation (DARE) Graphics Metafile (DGM) files. This presentation describes how to create graphical overlays on-the-fly for AWIPS, by using two examples of AWIPS applications that were created by the Applied Meteorology Unit (AMU) located at Cape Canaveral Air Force Station (CCAFS), Florida. The first example is the Anvil Threat Corridor Forecast Tool, which produces a shapefile that depicts a graphical threat corridor of the forecast movement of thunderstorm anvil clouds, based on the observed or forecast upper-level winds. This tool is used by the Spaceflight Meteorology Group (SMG) at Johnson Space Center, Texas and 45th Weather Squadron (45 WS) at CCAFS to analyze the threat of natural or space vehicle-triggered lightning over a location. The second example is a launch and landing trajectory tool that produces a DGM file that plots the ground track of space vehicles during launch or landing. The trajectory tool can be used by SMG and the 45 WS forecasters to analyze weather radar imagery along a launch or landing trajectory. The presentation will list the advantages and disadvantages of both file types for creating interactive graphical overlays in future AWIPS applications. Shapefiles are a popular format used extensively in Geographical Information Systems. They are usually used in AWIPS to depict static map backgrounds. A shapefile stores the geometry and attribute information of spatial features in a dataset (ESRI 1998). Shapefiles can contain point, line, and polygon features. Each shapefile contains a main file, index file, and a dBASE table. The main file contains a record for each spatial feature, which describes the feature with a list of its vertices. The index file contains the offset of each record from the beginning of the main file. The dBASE table contains records for each attribute. Attributes are commonly used to label spatial features. Shapefiles can be viewed, but not created in AWIPS. As a result, either third-party software can be installed on an AWIPS workstation, or new software must be written to create shapefiles in the correct format.

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

    PubMed

    Meireles, Daniely Amorin; Bastos, Mariana Mena Barreto; Marques, André Augusto Franco; Garcia, Lucas da Fonseca Roberti; Sponchiado, Emílio Carlos

    2013-08-01

    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

  1. A personal computer program to transfer MultiMate files to automated office system documents

    SciTech Connect

    Kern, J.N.

    1989-01-27

    A personal computer/disk operating system program, MultiMate to DEC WPS (MMWPS), was developed to read a MultiMate DOC file, interpret it into an ASCII text stream, then type it out the serial port at the baud rate and other serial port parameters specified when the program began. This program provides a simple way to incorporate a MultiMate document into the automated office system editor, WPS-Plus. 2 refs.

  2. U.S. Department of Energy Best Practices Workshop onFile Systems & Archives San Francisco, CA September 26-27, 2011 Position Paper

    SciTech Connect

    Hedges, R M

    2011-09-01

    This position paper discusses issues of usability of the large parallel file systems in the Livermore Computing Center. The primary uses of these file systems are for storage and access of data that is created during the course of a simulation running on an LC system. The Livermore Computing Center has multiple, globally mounted parallel file systems in each of its computing environments. The single biggest issue of file system usability that we have encountered through the years is to maintain continuous file system responsiveness. Given the back end storage hardware that our file systems are provisioned with, it is easily possible for a particularly I/O intensive application or one with particularly inefficiently coded I/O operations to bring the file system to an apparent halt. The practice that we will be addressing is one of having an ability to indentify, diagnose, analyze and optimize the I/O quickly and effectively.

  3. Histological evaluation of the cleaning effectiveness of two reciprocating single-file systems in severely curved root canals: Reciproc versus WaveOne

    PubMed Central

    Carvalho, Maira de Souza; Junior, Emílio Carlos Sponchiado; Bitencourt Garrido, Angela Delfina; Roberti Garcia, Lucas da Fonseca; Franco Marques, André Augusto

    2015-01-01

    Objective: The aim of this study was to evaluate the cleaning effectiveness achieved with two reciprocating single-file systems in severely curved root canals: Reciproc and WaveOne. Materials and Methods: Twenty-five mesial roots of mandibular molars were randomly separated into two groups, according to the instrumentation system used. The negative control group consisted of five specimens that were not instrumented. The mesial canals (buccal and lingual) in Reciproc Group were instrumented with file R25 and the WaveOne group with the Primary file. The samples were submitted to histological processing and analyzed under a digital microscope. Results: The WaveOne group presented a larger amount of debris than the Reciproc Group, however, without statistically significant difference (P > 0.05). A larger amount of debris in the control group was observed, with statistically significant difference to Reciproc and WaveOne groups (P < 0.05). Conclusions: The two reciprocating single-file instrumentation systems presented similar effectiveness for root canal cleaning. PMID:25713489

  4. HPC Global File System Performance Analysis Using A Scientific-Application Derived Benchmark

    SciTech Connect

    Borrill, Julian; Oliker, Leonid; Shalf, John; Shan, Hongzhang; Uselton, Andrew

    2008-08-28

    With the exponential growth of high-fidelity sensor and simulated data, the scientific community is increasingly reliant on ultrascale HPC resources to handle its data analysis requirements. However, to use such extreme computing power effectively, the I/O components must be designed in a balanced fashion, as any architectural bottleneck will quickly render the platform intolerably inefficient. To understand I/O performance of data-intensive applications in realistic computational settings, we develop a lightweight, portable benchmark called MADbench2, which is derived directly from a large-scale Cosmic Microwave Background (CMB) data analysis package. Our study represents one of the most comprehensive I/O analyses of modern parallel file systems, examining a broad range of system architectures and configurations, including Lustre on the Cray XT3, XT4, and Intel Itanium2 clusters; GPFS on IBM Power5 and AMD Opteron platforms; a BlueGene/P installation using GPFS and PVFS2 file systems; and CXFS on the SGI Altix\\-3700. We present extensive synchronous I/O performance data comparing a number of key parameters including concurrency, POSIX- versus MPI-IO, and unique-versus shared-file accesses, using both the default environment as well as highly-tuned I/O parameters. Finally, we explore the potential of asynchronous I/O and show that only the two of the nine evaluated systems benefited from MPI-2's asynchronous MPI-IO. On those systems, experimental results indicate that the computational intensity required to hide I/O effectively is already close to the practical limit of BLAS3 calculations. Overall, our study quantifies vast differences in performance and functionality of parallel file systems across state-of-the-art platforms -- showing I/O rates that vary up to 75x on the examined architectures -- while providing system designers and computational scientists a lightweight tool for conducting further analysis.

  5. A File Allocation Strategy for Energy-Efficient Disk Storage Systems

    SciTech Connect

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

    2008-06-27

    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.

  6. Software installation and condition data distribution via CernVM File System in ATLAS

    NASA Astrophysics Data System (ADS)

    De Salvo, A.; De Silva, A.; Benjamin, D.; Blomer, J.; Buncic, P.; Harutyunyan, A.; Undrus, A.; Yao, Y.

    2012-12-01

    The ATLAS collaboration is managing one of the largest collections of software among the High Energy Physics experiments. Traditionally, this software has been distributed via rpm or pacman packages, and has been installed in every site and user's machine, using more space than needed since the releases share common files but are installed in their own trees. As soon as the software has grown in size and number of releases this approach showed its limits, in terms of manageability, used disk space and performance. The adopted solution is based on the CernVM File System, a fuse-based HTTP, read-only filesystem which guarantees file de-duplication, on-demand file transfer with caching, scalability and performance. Here we describe the ATLAS experience in setting up the CVMFS facility and putting it into production, for different type of use-cases, ranging from single users’ machines up to large data centers, for both software and conditions data. The performance of CernVM-FS, both with software and condition data access, will be shown, comparing with other filesystems currently in use by the collaboration.

  7. 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

    Summit, Roger K.

    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…

  8. A design for a new catalog manager and associated file management for the Land Analysis System (LAS)

    NASA Technical Reports Server (NTRS)

    Greenhagen, Cheryl

    1986-01-01

    Due to the larger number of different types of files used in an image processing system, a mechanism for file management beyond the bounds of typical operating systems is necessary. The Transportable Applications Executive (TAE) Catalog Manager was written to meet this need. Land Analysis System (LAS) users at the EROS Data Center (EDC) encountered some problems in using the TAE catalog manager, including catalog corruption, networking difficulties, and lack of a reliable tape storage and retrieval capability. These problems, coupled with the complexity of the TAE catalog manager, led to the decision to design a new file management system for LAS, tailored to the needs of the EDC user community. This design effort, which addressed catalog management, label services, associated data management, and enhancements to LAS applications, is described. The new file management design will provide many benefits including improved system integration, increased flexibility, enhanced reliability, enhanced portability, improved performance, and improved maintainability.

  9. Metadata Efficiency in a Comprehensive Versioning File System

    E-print Network

    Force Research Laboratory, under agreement number F49620-01-1-0433. The U.S. Government is authorized as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Research Laboratory or the U.S. Government. This work is also partially funded by the DARPA/ITO OASIS

  10. Metadata Efficiency in a Comprehensive Versioning File System

    E-print Network

    Force Research Laboratory, under agreement number F49620­01­1­0433. The U.S. Government is authorized as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Research Laboratory or the U.S. Government. This work is also partially funded by the DARPA/ITO OASIS

  11. Design and Implementation of a Direct Access File System (DAFS) Kernel Server for FreeBSD

    Microsoft Academic Search

    Kostas Magoutis

    2002-01-01

    The Direct Access File System (DAFS) is an emerging commercial standard for network-attached storage on server cluster interconnects. The DAFS architecture and protocol leverage network interface controller (NIC) support for user-level networking, remote direct memory access, ecien t event noti- cation, and reliable communication. This paper describes the design of the rst implementation of a DAFS kernel server for FreeBSD,

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

    PubMed Central

    Xiao, Guoqiang; Peng, Xiaoning

    2014-01-01

    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

  13. Ranking Under Uncertainty Dept. Phys. Comp. Systems

    E-print Network

    Domany, Eytan

    Ranking Under Uncertainty Or Zuk1, 1 Dept. Phys. Comp. Systems Weizmann Inst. of Science Rehovot Research Labs Haifa, 31015, Israel liat.ein.dor@intel.com Eytan Domany1 Abstract Ranking objects to each object according to its relevance to the prob- lem at hand. Ranking is widely used for ob- ject

  14. Management of the Israeli National Water System under Uncertainty

    NASA Astrophysics Data System (ADS)

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

    2009-12-01

    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

  15. Density functional theory of single-file classical fluids

    NASA Astrophysics Data System (ADS)

    Percus, J. K.

    An overcomplete density functional formalism is derived to represent the thermal behaviour of confined classical fluids under single-file conditions. Strictly one-dimensional hard rod systems are reanalysed from this viewpoint, and the context is then broadened to encompass hard spheres in cylindrical enclosures. Applications to non-single-file conditions, modulated enclosures, and confined polymers are mentioned.

  16. Text File Comparator

    NASA Technical Reports Server (NTRS)

    Kotler, R. S.

    1983-01-01

    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.

  17. GAS: Overloading a File Sharing Network as an Anonymizing System

    Microsoft Academic Search

    Elias Athanasopoulos; Mema Roussopoulos; Kostas G. Anagnostakis; Evangelos P. Markatos

    2007-01-01

    Anonymity is considered as a valuable property as far as everyday transactions in the Internet are concerned. Users care about their privacy and they seek for new ways to keep secret as much as of their personal information from third parties. Anonymizing systems exist nowadays that provide users with the tech- nology, which is able to hide their origin when

  18. High Availability for the Lustre File System A Dissertation

    E-print Network

    Engelmann, Christian

    Of The Requirements For The Degree Of MASTER OF SCIENCE In NETWORK CENTERED COMPUTING, HIGH PERFORMANCE COMPUTING Contract No. DE-AC05-00OR22725. #12;#12;Abstract With the growing importance of high performance computing and, more importantly, the fast growing size of sophisticated high performance computing systems

  19. Standard interface file handbook

    SciTech Connect

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

    1992-10-01

    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.

  20. Root Canal Shaping by Single-File Systems and Rotary Instruments: a Laboratory Study

    PubMed Central

    Bane, Khaly; Faye, Babacar; Sarr, Mouhamed; Niang, Seydina O; Ndiaye, Diouma; Machtou, Pierre

    2015-01-01

    Introduction: The aim of this study was to compare the shaping ability of two single-file systems and conventional rotary instruments in severely curved root canals of extracted human molars. Methods and Materials: Mesiobuccal canals of 120 mandibular molars with angles of curvature ranging between 25° and 35° and radii of curvature from 5 to 9 mm, were divided into three groups (n=40). In each group the canals were instrumented with either WaveOne (W), Reciproc (R) or ProTaper (P). The time required for canal shaping and the frequency of broken instruments were recorded. The standardized pre and post-instrumentation radiographs were taken to determine changes in working length (WL) and straightening of canal curvature. The presence of blockage or perforation was also evaluated. Data were analyzed using the one-way analysis of variance (ANOVA) and post-hoc Tukey’s test. The level of significance was set at 0.05. Results: Both single-instrument systems reduced the canal preparation time by approximately 50% (P<0.05). No incidence of broken instruments from single-file systems was reported; however, two F2 instruments in the P group were broken (P<0.05). Reduction in WL and straightening of canal curvature was observed in all three systems with the highest scores belonging to P system (P<0.05). No case of blockage or perforation was found during shaping in any group. Conclusion: Single-file systems shaped curved canals with substantial saving in time and a significant decrease in incidence of instrument separation, change in WL, and straightening of canal curvature. PMID:25834600

  1. 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.

  2. Site Enforcement Tracking System (SETS) (National) (on diskette). Data file

    SciTech Connect

    NONE

    1997-11-01

    When expending Superfund monies at a CERCLA (Comprehensive Environmental Response, Compensation and Liability Act) site, EPA must conduct a search to identify parties with potential financial responsibility for remediation of uncontrolled hazardous waste sites. EPA regional Superfund Waste Management Staff issue a notice letter to the potentially responsible party (PRP). Data from this notice letter are used to form the Site Enforcement Tracking System (SETS). These data includes PRP name and address, a company contact person, the date the notice was issued, and the related CERCLA site name and identification number. SETS was created by EPA to track PRP identification at both NPL (National Priority List) and non-NPL sites. SETS does not address the range of other administrative duties related to tracking the PRP. These lists represent EPA`s preliminary findings on the identities of PRPs. Inclusion on these lists does not constitute a final determination concerning the liability of any party for the hazard or contamination at any CERCLA site.

  3. 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.

  4. Formalizing structured file services for the data storage and retrieval subsystem of the data management system for Spacestation Freedom

    NASA Technical Reports Server (NTRS)

    Jamsek, Damir A.

    1993-01-01

    A brief example of the use of formal methods techniques in the specification of a software system is presented. The report is part of a larger effort targeted at defining a formal methods pilot project for NASA. One possible application domain that may be used to demonstrate the effective use of formal methods techniques within the NASA environment is presented. It is not intended to provide a tutorial on either formal methods techniques or the application being addressed. It should, however, provide an indication that the application being considered is suitable for a formal methods by showing how such a task may be started. The particular system being addressed is the Structured File Services (SFS), which is a part of the Data Storage and Retrieval Subsystem (DSAR), which in turn is part of the Data Management System (DMS) onboard Spacestation Freedom. This is a software system that is currently under development for NASA. An informal mathematical development is presented. Section 3 contains the same development using Penelope (23), an Ada specification and verification system. The complete text of the English version Software Requirements Specification (SRS) is reproduced in Appendix A.

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

    SciTech Connect

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

    1983-10-01

    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.

  6. 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

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

    2013-01-01

    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

  7. NAFFS: network attached flash file system for cloud storage on portable consumer electronics

    NASA Astrophysics Data System (ADS)

    Han, Lin; Huang, Hao; Xie, Changsheng

    Cloud storage technology has become a research hotspot in recent years, while the existing cloud storage services are mainly designed for data storage needs with stable high speed Internet connection. Mobile Internet connections are often unstable and the speed is relatively low. These native features of mobile Internet limit the use of cloud storage in portable consumer electronics. The Network Attached Flash File System (NAFFS) presented the idea of taking the portable device built-in NAND flash memory as the front-end cache of virtualized cloud storage device. Modern portable devices with Internet connection have built-in more than 1GB NAND Flash, which is quite enough for daily data storage. The data transfer rate of NAND flash device is much higher than mobile Internet connections[1], and its non-volatile feature makes it very suitable as the cache device of Internet cloud storage on portable device, which often have unstable power supply and intermittent Internet connection. In the present work, NAFFS is evaluated with several benchmarks, and its performance is compared with traditional network attached file systems, such as NFS. Our evaluation results indicate that the NAFFS achieves an average accessing speed of 3.38MB/s, which is about 3 times faster than directly accessing cloud storage by mobile Internet connection? and offers a more stable interface than that of directly using cloud storage API. Unstable Internet connection and sudden power off condition are tolerable, and no data in cache will be lost in such situation.

  8. An Interactive Information Retrieval System; Case Studies on the Use of DIALOG to Search the ERIC Document File.

    ERIC Educational Resources Information Center

    Timbie, Michele; Coombs, Don H.

    The first interactive (on-line) computerized use of the ERIC files by the U.S. Office of Education is reported in the form of an evaluation of the DIALOG system conducted at the ERIC Clearinghouse for Educational Media and Technology. Descriptions of the purposes of the study, of the DIALOG system (developed by Lockheed Missiles and Space Co.),…

  9. Peer-to-Peer Beyond File Sharing: Where are P2P Systems Going? Renato Lo Cigno

    E-print Network

    Lo Cigno, Renato Antonio

    Peer-to-Peer Beyond File Sharing: Where are P2P Systems Going? Renato Lo Cigno DISI, Univ, Italy luca.veltri@unipr.it Abstract Are P2P systems and applications here to stay? Or are they a bright question, highlighting reasons why the P2P paradigm should become an integral part of computing

  10. Thermodynamics of quantum systems under dynamical control

    E-print Network

    D. Gelbwaser-Klimovsky; Wolfgang Niedenzu; Gershon Kurizki

    2015-03-04

    In this review the debated rapport between thermodynamics and quantum mechanics is addressed in the framework of the theory of periodically-driven/controlled quantum-thermodynamic machines. The basic model studied here is that of a two-level system (TLS), whose energy is periodically modulated while the system is coupled to thermal baths. When the modulation interval is short compared to the bath memory time, the system-bath correlations are affected, thereby causing cooling or heating of the TLS, depending on the interval. In steady state, a periodically-modulated TLS coupled to two distinct baths constitutes the simplest quantum heat machine (QHM) that may operate as either an engine or a refrigerator, depending on the modulation rate. We find their efficiency and power-output bounds and the conditions for attaining these bounds. An extension of this model to multilevel systems shows that the QHM power output can be boosted by the multilevel degeneracy. These results are used to scrutinize basic thermodynamic principles: (i) Externally-driven/modulated QHMs may attain the Carnot efficiency bound, but when the driving is done by a quantum device ("piston"), the efficiency strongly depends on its initial quantum state. Such dependence has been unknown thus far. (ii) The refrigeration rate effected by QHMs does not vanish as the temperature approaches absolute zero for certain quantized baths, e.g., magnons, thous challenging Nernst's unattainability principle. (iii) System-bath correlations allow more work extraction under periodic control than that expected from the Szilard-Landauer principle, provided the period is in the non-Markovian domain. Thus, dynamically-controlled QHMs may benefit from hitherto unexploited thermodynamic resources.

  11. File under Fleeting

    ERIC Educational Resources Information Center

    Torgovnick, Marianna

    2008-01-01

    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…

  12. Cognitive and Neuronal Systems Underlying Obesity

    PubMed Central

    Kanoski, Scott E.

    2012-01-01

    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

  13. 78 FR 45921 - Combined Notice of Filings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-30

    ...filings: Filings Instituting Proceedings Docket Numbers: RP13-1091-000. Applicants: Stingray Pipeline Company, L.L.C. Description: Revise Stingray System Map to be effective 9/1/2013. Filed Date: 7/23/13. Accession...

  14. cadcVOFS: A FUSE Based File System Layer for VOSpace

    NASA Astrophysics Data System (ADS)

    Kavelaars, J.; Dowler, P.; Jenkins, D.; Hill, N.; Damian, A.

    2012-09-01

    The CADC is now making extensive use of the VOSpace protocol for user managed storage. The VOSpace standard allows a diverse set of rich data services to be delivered to users via a simple protocol. We have recently developed the cadcVOFS, a FUSE based file-system layer for VOSpace. cadcVOFS provides a filesystem layer on-top of VOSpace so that standard Unix tools (such as ‘find’, ‘emacs’, ‘awk’ etc) can be used directly on the data objects stored in VOSpace. Once mounted the VOSpace appears as a network storage volume inside the operating system. Within the CADC Cloud Computing project (CANFAR) we have used VOSpace as the method for retrieving and storing processing inputs and products. The abstraction of storage is an important component of Cloud Computing and the high use level of our VOSpace service reflects this.

  15. Architecture of a high-performance PACS based on a shared file system

    NASA Astrophysics Data System (ADS)

    Glicksman, Robert A.; Wilson, Dennis L.; Perry, John H.; Prior, Fred W.

    1992-07-01

    The Picture Archive and Communication System developed by Loral Western Development Laboratories and Siemens Gammasonics Incorporated utilizes an advanced, high speed, fault tolerant image file server or Working Storage Unit (WSU) combined with 100 Mbit per second fiber optic data links. This central shared file server is capable of supporting the needs of more than one hundred workstations and acquisition devices at interactive rates. If additional performance is required, additional working storage units may be configured in a hyper-star topology. Specialized processing and display hardware is used to enhance Apple Macintosh personal computers to provide a family of low cost, easy to use, yet extremely powerful medical image workstations. The Siemens LiteboxTM application software provides a consistent look and feel to the user interface of all workstation in the family. Modern database and wide area communications technologies combine to support not only large hospital PACS but also outlying clinics and smaller facilities. Basic RIS functionality is integrated into the PACS database for convenience and data integrity.

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

    ERIC Educational Resources Information Center

    Boone, Michael A.

    2012-01-01

    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…

  17. Abstract --In this paper, we compare the file transfer delays between end hosts for two different networking approaches under

    E-print Network

    Veeraraghavan, Malathi

    Abstract -- In this paper, we compare the file transfer delays between end hosts for two different the impact of four parameters: round-trip propagation delay, transmission link rate, the number of routers/switches on the end-to-end path, and call processing delays at the circuit switches. We arrive at two impor- tant

  18. Research of Efficient C/S Model Based File Transfer Method

    NASA Astrophysics Data System (ADS)

    Li, Xubin; Zou, Quan; Jiang, Yi

    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.

  19. Evaluation of Apical Extrusion of Debris and Irrigant Using Two New Reciprocating and One Continuous Rotation Single File Systems

    PubMed Central

    Nayak, Gurudutt; Singh, Inderpreet; Shetty, Shashit; Dahiya, Surya

    2014-01-01

    Objective: Apical extrusion of debris and irrigants during cleaning and shaping of the root canal is one of the main causes of periapical inflammation and postoperative flare-ups. The purpose of this study was to quantitatively measure the amount of debris and irrigants extruded apically in single rooted canals using two reciprocating and one rotary single file nickel-titanium instrumentation systems. Materials and Methods: Sixty human mandibular premolars, randomly assigned to three groups (n = 20) were instrumented using two reciprocating (Reciproc and Wave One) and one rotary (One Shape) single-file nickel-titanium systems. Bidistilled water was used as irrigant with traditional needle irrigation delivery system. Eppendorf tubes were used as test apparatus for collection of debris and irrigant. The volume of extruded irrigant was collected and quantified via 0.1-mL increment measure supplied on the disposable plastic insulin syringe. The liquid inside the tubes was dried and the mean weight of debris was assessed using an electronic microbalance. The data were statistically analysed using Kruskal-Wallis nonparametric test and Mann Whitney U test with Bonferroni adjustment. P-values less than 0.05 were considered significant. Results: The Reciproc file system produced significantly more debris compared with OneShape file system (P<0.05), but no statistically significant difference was obtained between the two reciprocating instruments (P>0.05). Extrusion of irrigant was statistically insignificant irrespective of the instrument or instrumentation technique used (P >0.05). Conclusions: Although all systems caused apical extrusion of debris and irrigant, continuous rotary instrumentation was associated with less extrusion as compared with the use of reciprocating file systems. PMID:25628665

  20. A personal computer program to transfer documents from the automated office system to MultiMate disk files

    SciTech Connect

    Kern, J.N.

    1989-01-27

    A program, WPS to MultiMate file transfer (WPSMM), was developed to collect text from the WPS-Plus editor of the automated office system (AOS), interpret it into an ASCII text stream, translate it to a MultiMate DOC file format, then write it out to a personal computer disk drive. The program communicates with AOS using the serial port of the computer at the baud rate and other parameters specified when the program began. This program provides a simple way to create a MultiMate document from a document in the AOS editor, WPS-Plus. 1 ref.

  1. The Tort System \\

    Microsoft Academic Search

    J. David Cummins; Sharon Tennyson

    1993-01-01

    The paper focuses on the effects of claimant behavior, especially fraudulent claiming, in determining liability insurance costs. The theoretical perspective underlying the analysis is that the ease of filing a claim and the net potential payoff affect individuals' incentives to file claims. Compensating claims via the liability system thus may increase incentives to file, because the payoff from a successful

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

    PubMed

    Hasheminia, Seyed Mohsen; Farhadi, Nastaran; Shokraneh, Ali

    2013-01-01

    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

  3. UnityFS: A File System for the Unity Block Store A thesis submitted in conformity with the requirements

    E-print Network

    Lie, David

    UnityFS: A File System for the Unity Block Store by Wei Huang A thesis submitted in conformity for the Unity Block Store Wei Huang Master of Applied Science Graduate Department of Electrical and Computer have to trust the cloud provider not to be malicious. Now we have a Unity block store, which can solve

  4. Technical Report on the Prospective Student Inquiry Data File and Information System at California State University, Chico.

    ERIC Educational Resources Information Center

    Lukes, John A.

    This report discusses the development and characteristics of the Prospective Student Inquiry Data File and Information System, which is used by the California State University at Chico (CSUC) as part of an effort to increase its student applicant population. Following a brief review of organizational background information, the report is divided…

  5. Energy-Efficiency and Storage Flexibility in the Blue File System Edmund B. Nightingale and Jason Flinn

    E-print Network

    Flinn, Jason

    Energy-Efficiency and Storage Flexibility in the Blue File System Edmund B. Nightingale and Jason connec- tivity to small, mobile devices. Portable storage, such as mobile disks and USB keychains, let to pervasive data access remain. First, power-hungry network and storage devices tax the lim- ited battery

  6. An Approach Using Parallel Architecture to Storage DICOM Images in Distributed File System

    NASA Astrophysics Data System (ADS)

    Soares, Tiago S.; Prado, Thiago C.; Dantas, M. A. R.; de Macedo, Douglas D. J.; Bauer, Michael A.

    2012-02-01

    Telemedicine is a very important area in medical field that is expanding daily motivated by many researchers interested in improving medical applications. In Brazil was started in 2005, in the State of Santa Catarina has a developed server called the CyclopsDCMServer, which the purpose to embrace the HDF for the manipulation of medical images (DICOM) using a distributed file system. Since then, many researches were initiated in order to seek better performance. Our approach for this server represents an additional parallel implementation in I/O operations since HDF version 5 has an essential feature for our work which supports parallel I/O, based upon the MPI paradigm. Early experiments using four parallel nodes, provide good performance when compare to the serial HDF implemented in the CyclopsDCMServer.

  7. 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

  8. A new insight into the oscillation characteristics of endosonic files used in dentistry

    NASA Astrophysics Data System (ADS)

    Lea, S. C.; Walmsley, A. D.; Lumley, P. J.; Landini, G.

    2004-05-01

    The aim of this study was to assess the oscillation characteristics of unconstrained endosonic files using a scanning laser vibrometer (SLV). Factors investigated included file vibration frequency and node/antinode location as well as the variation in file displacement amplitude due to increasing generator power setting. A 30 kHz Mini Piezon generator (Electro-Medical Systems, Switzerland) was used in conjunction with a #15 and #35 K-file. Each file was fixed in position with the long axis of the file perpendicular to the SLV camera head. The laser from the SLV was scanned over the length of the oscillating file for generator power settings 1 to 5 (minimum to half power). Measurements were repeated ten times. The fundamental vibration frequency for both files was 27.50 kHz. Scans of each file showed the positions of nodes/anti-nodes along the file length. The #15 file demonstrated no significant variation in its mean maximum displacement amplitude with increasing generator power, except at power setting 5, where a decrease in displacement amplitude was observed. The #35 file showed a general increase in mean maximum displacement amplitude with increasing power setting, except at power setting 4 where a 65% decrease in displacement amplitude occurred. In conclusion, scanning laser vibrometry is an effective method for assessing endosonic file vibration characteristics. The SLV was able to demonstrate that (unloaded) file vibration displacement amplitude does not increase linearly with increasing generator power. Further work is being performed on a greater variety of files and generators. Vibration characteristics of files under various loads and varying degrees of constraint should also be investigated.

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

    Microsoft Academic Search

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

    1994-01-01

    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.

  10. An Empirical Study of a Highly Available File System Brian D. Noble and M. Satyanarayanan

    E-print Network

    Satyanarayanan, Mahadev "Satya"

    , Wright Research and Development Center, Aeronauucal Systems Division (AFSC), U S Air Force, Wright-Patterson AFB, Ohio, 45433-6543 under Contract F33615-90-C-1465. ARPA Order Nu 7597 and Hanscom AFB, Contract F

  11. 75 FR 4061 - New York Independent System Operator, Inc; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-26

    ...January 8, 2010, New York Independent System Operator, Inc. (NYISO), pursuant to section 207 of the Federal Energy Regulatory...Transmission Congestion Contracts under Attachment L of the NYISO Open Access Transmission Tariff after the original 825 MW...

  12. Passive Decomposition of Multiple Mechanical Systems under Coordination Requirements

    E-print Network

    Lee, Dongjun

    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

  13. Stability radii of positive discretetime systems under affine parameter perturbations

    E-print Network

    Hinrichsen, Diederich - Fachbereich 3

    Stability radii of positive discrete­time systems under affine parameter perturbations D@thevinh.ac.vn Abstract In this paper we study stability radii of positive linear discrete­time systems under affine parameter perturbations. It is shown that real and complex stability radii of positive systems coincide

  14. Tensile Fracturing of Stiff Rock Layers under Triaxial Compressive Stre... file:///C:/Documents%20and%20Settings/Zeev%20Reches/My%20Doc... 1 of 11 11/27/2006 8:45 AM

    E-print Network

    Ze'ev, Reches

    Tensile Fracturing of Stiff Rock Layers under Triaxial Compressive Stre... file:///C:/Documents%20, Tensile fracturing of stiff rock layers under triaxial compressive stress states, 3rd NARMS, Mexcio, June, 1998, Int. J. of Rock Mech. & Min. Sci. 35: 4-5, Paper No. 70 Tensile Fracturing of Stiff Rock Layers

  15. 18 CFR 46.6 - Contents of the statement and procedures for filing.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... REGULATIONS UNDER THE FEDERAL POWER ACT PUBLIC UTILITY FILING REQUIREMENTS AND FILING REQUIREMENTS FOR PERSONS HOLDING INTERLOCKING POSITIONS § 46.6 Contents of the statement and procedures for filing. Each person required to file a written...

  16. 18 CFR 46.6 - Contents of the statement and procedures for filing.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... REGULATIONS UNDER THE FEDERAL POWER ACT PUBLIC UTILITY FILING REQUIREMENTS AND FILING REQUIREMENTS FOR PERSONS HOLDING INTERLOCKING POSITIONS § 46.6 Contents of the statement and procedures for filing. Each person required to file a written...

  17. 18 CFR 46.6 - Contents of the statement and procedures for filing.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... REGULATIONS UNDER THE FEDERAL POWER ACT PUBLIC UTILITY FILING REQUIREMENTS AND FILING REQUIREMENTS FOR PERSONS HOLDING INTERLOCKING POSITIONS § 46.6 Contents of the statement and procedures for filing. Each person required to file a written...

  18. 18 CFR 46.6 - Contents of the statement and procedures for filing.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... REGULATIONS UNDER THE FEDERAL POWER ACT PUBLIC UTILITY FILING REQUIREMENTS AND FILING REQUIREMENTS FOR PERSONS HOLDING INTERLOCKING POSITIONS § 46.6 Contents of the statement and procedures for filing. Each person required to file a written...

  19. 18 CFR 46.6 - Contents of the written statement and procedures for filing.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... REGULATIONS UNDER THE FEDERAL POWER ACT PUBLIC UTILITY FILING REQUIREMENTS AND FILING REQUIREMENTS FOR PERSONS HOLDING INTERLOCKING POSITIONS § 46.6 Contents of the written statement and procedures for filing. Each person required to file a...

  20. 17 CFR 230.425 - Filing of certain prospectuses and communications under § 230.135 in connection with business...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...prospectuses and communications under § 230...connection with business combination...prospectuses and communications under § 230...connection with business combination...All written communications made in...

  1. Ecological and genetic systems underlying sustainable horticulture

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Agriculture in the 21st century will face unprecedented challenges due to rising energy costs, global climate change, and increasingly scarce production resources. It will become imperative for producers to adopt sustainable systems that rely on natural system processes and use inputs as efficientl...

  2. CROP PRODUCTION COMPARISON UNDER VARIOUS IRRIGATION SYSTEMS

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Studies on crop productivity for major irrigated crops in the Great Plains were reviewed for different types of modern pressurized irrigation systems. Crops included corn, cotton, grain sorghum, winter wheat, and preliminary data on soybean and sunflower. Irrigation systems consisted of spray and lo...

  3. 29 CFR 102.46 - Exceptions, cross-exceptions, briefs, answering briefs; time for filing; where to file; service...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...briefs, answering briefs; time for filing; where to file...on the parties; extension of time; effect of failure to include...BOARD RULES AND REGULATIONS, SERIES 8 Procedure Under Section...briefs, answering briefs; time for filing; where to...

  4. 29 CFR 102.46 - Exceptions, cross-exceptions, briefs, answering briefs; time for filing; where to file; service...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...briefs, answering briefs; time for filing; where to file...on the parties; extension of time; effect of failure to include...BOARD RULES AND REGULATIONS, SERIES 8 Procedure Under Section...briefs, answering briefs; time for filing; where to...

  5. 76 FR 9780 - Notification of Deletion of System of Records; EPA Parking Control Office File (EPA-10) and EPA...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-22

    ...of Records; EPA Parking Control Office File (EPA-10) and EPA Transit and Guaranteed Ride Home Program Files (EPA-35) AGENCY: Environmental Protection...records for EPA Parking Control Office File (EPA-10), published in the...

  6. 77 FR 62226 - Privacy Act of 1974; System of Records-Principal Investigator/Application File and Associated...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-12

    ...Principal Investigator/ Application File and Associated Records AGENCY: Institute...Sciences Principal Investigator/Application File and Associated Records'' (18-13-26...notice will cover a database and paper files containing personally identifying...

  7. System architecture analysis and selection under uncertainty

    E-print Network

    Smaling, Rudolf M

    2005-01-01

    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 ...

  8. Job Scheduling Under the Portable Batch System

    NASA Technical Reports Server (NTRS)

    Henderson, Robert L.; Woodrow, Thomas S. (Technical Monitor)

    1995-01-01

    The typical batch queuing system schedules jobs for execution by a set of queue controls. The controls determine from which queues jobs may be selected. Within the queue, jobs are ordered first-in, first-run. This limits the set of scheduling policies available to a site. The Portable Batch System removes this limitation by providing an external scheduling module. This separate program has full knowledge of the available queued jobs, running jobs, and system resource usage. Sites are able to implement any policy expressible in one of several procedural language. Policies may range from "bet fit" to "fair share" to purely political. Scheduling decisions can be made over the full set of jobs regardless of queue or order. The scheduling policy can be changed to fit a wide variety of computing environments and scheduling goals. This is demonstrated by the use of PBS on an IBM SP-2 system at NASA Ames.

  9. Black-Box Problem Diagnosis in Parallel File Systems Michael P. Kasick1, Jiaqi Tan2, Rajeev Gandhi1, Priya Narasimhan1

    E-print Network

    Black-Box Problem Diagnosis in Parallel File Systems Michael P. Kasick1, Jiaqi Tan2, Rajeev Gandhi1 in Figure 1. Problem diagnosis is even more important in HPC where the effects of performance problems

  10. Ceph: A Scalable, High-Performance Distributed File System Sage A. Weil Scott A. Brandt Ethan L. Miller Darrell D. E. Long

    E-print Network

    Pâris, Jehan-François

    Ceph: A Scalable, High-Performance Distributed File System Sage A. Weil Scott A. Brandt Ethan L of unreliable OSDs. We leverage OSD intelligence to distribute data replication, failure detection and recovery

  11. XML Files

    MedlinePLUS

    ... Topics Drugs & Supplements Videos & Cool Tools MedlinePlus XML Files To use the sharing features on this page, ... If you have questions about the MedlinePlus XML files, please contact us . For additional sources of MedlinePlus ...

  12. Efficient algorithms for multi-file caching

    SciTech Connect

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

    2004-03-15

    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.

  13. Performance Analysis of Manufacturing Systems Under Hybrid Control Policies

    E-print Network

    Gershwin, Stanley B.

    is widely used in practice, and is seen as the \\state of the art" in lean manufacturing. We present severalPerformance Analysis of Manufacturing Systems Under Hybrid Control Policies by Asbjoern M. Bonvik of Manufacturing Systems Under Hybrid Control Policies by Asbjoern M. Bonvik Submitted to the Department

  14. Modeling Water Resource Systems under Climate Change: IGSM-WRS

    E-print Network

    Modeling Water Resource Systems under Climate Change: IGSM-WRS Kenneth Strzepek, Adam Schlosser-profit organizations. To inform processes of policy development and implementation, climate change research needs://globalchange.mit.edu/ Printed on recycled paper #12;1 Modeling Water Resource Systems under Climate Change: IGSM-WRS Kenneth

  15. CT Teaching Files

    NSDL National Science Digital Library

    Fishman, Elliot K.

    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 â??Diagnosisâ?ť 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.

  16. 37 CFR 401.16 - Electronic filing.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Electronic filing. 401.16 Section 401.16...MADE BY NONPROFIT ORGANIZATIONS AND SMALL BUSINESS FIRMS UNDER GOVERNMENT GRANTS, CONTRACTS...COOPERATIVE AGREEMENTS § 401.16 Electronic filing. Unless otherwise...

  17. 37 CFR 401.16 - Electronic filing.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Electronic filing. 401.16 Section 401.16...MADE BY NONPROFIT ORGANIZATIONS AND SMALL BUSINESS FIRMS UNDER GOVERNMENT GRANTS, CONTRACTS...COOPERATIVE AGREEMENTS § 401.16 Electronic filing. Unless otherwise...

  18. 37 CFR 401.16 - Electronic filing.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Electronic filing. 401.16 Section 401.16...MADE BY NONPROFIT ORGANIZATIONS AND SMALL BUSINESS FIRMS UNDER GOVERNMENT GRANTS, CONTRACTS...COOPERATIVE AGREEMENTS § 401.16 Electronic filing. Unless otherwise...

  19. 37 CFR 401.16 - Electronic filing.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Electronic filing. 401.16 Section 401.16...MADE BY NONPROFIT ORGANIZATIONS AND SMALL BUSINESS FIRMS UNDER GOVERNMENT GRANTS, CONTRACTS...COOPERATIVE AGREEMENTS § 401.16 Electronic filing. Unless otherwise...

  20. 37 CFR 401.16 - Electronic filing.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Electronic filing. 401.16 Section 401.16...MADE BY NONPROFIT ORGANIZATIONS AND SMALL BUSINESS FIRMS UNDER GOVERNMENT GRANTS, CONTRACTS...COOPERATIVE AGREEMENTS § 401.16 Electronic filing. Unless otherwise...

  1. The Ammonia?Hydrogen System under Pressure

    SciTech Connect

    Chidester, Bethany A.; Strobel, Timothy A. (CIW)

    2012-01-20

    Binary mixtures of hydrogen and ammonia were compressed in diamond anvil cells to 15 GPa at room temperature over a range of compositions. The phase behavior was characterized using optical microscopy, Raman spectroscopy, and synchrotron X-ray diffraction. Below 1.2 GPa we observed two-phase coexistence between liquid ammonia and fluid hydrogen phases with limited solubility of hydrogen within the ammonia-rich phase. Complete immiscibility was observed subsequent to the freezing of ammonia phase III at 1.2 GPa, although hydrogen may become metastably trapped within the disordered face-centered-cubic lattice upon rapid solidification. For all compositions studied, the phase III to phase IV transition of ammonia occurred at {approx}3.8 GPa and hydrogen solidified at {approx}5.5 GPa, transition pressures equivalent to those observed for the pure components. A P-x phase diagram for the NH{sub 3}-H{sub 2} system is proposed on the basis of these observations with implications for planetary ices, molecular compound formation, and possible hydrogen storage materials.

  2. Registered File Support for Critical Operations Files at (Space Infrared Telescope Facility) SIRTF

    NASA Technical Reports Server (NTRS)

    Turek, G.; Handley, Tom; Jacobson, J.; Rector, J.

    2001-01-01

    The SIRTF Science Center's (SSC) Science Operations System (SOS) has to contend with nearly one hundred critical operations files via comprehensive file management services. The management is accomplished via the registered file system (otherwise known as TFS) which manages these files in a registered file repository composed of a virtual file system accessible via a TFS server and a file registration database. The TFS server provides controlled, reliable, and secure file transfer and storage by registering all file transactions and meta-data in the file registration database. An API is provided for application programs to communicate with TFS servers and the repository. A command line client implementing this API has been developed as a client tool. This paper describes the architecture, current implementation, but more importantly, the evolution of these services based on evolving community use cases and emerging information system technology.

  3. Creating Interactive Graphical Overlays in the Advanced Weather Interactive Processing System (AWIPS) Using Shapefiles and DGM Files

    NASA Technical Reports Server (NTRS)

    Barrett, Joe H., III; Lafosse, Richard; Hood, Doris; Hoeth, Brian

    2007-01-01

    Graphical overlays can be created in real-time in the Advanced Weather Interactive Processing System (AWIPS) using shapefiles or DARE Graphics Metafile (DGM) files. This presentation describes how to create graphical overlays on-the-fly for AWIPS, by using two examples of AWIPS applications that were created by the Applied Meteorology Unit (AMU). The first example is the Anvil Threat Corridor Forecast Tool, which produces a shapefile that depicts a graphical threat corridor of the forecast movement of thunderstorm anvil clouds, based on the observed or forecast upper-level winds. This tool is used by the Spaceflight Meteorology Group (SMG) and 45th Weather Squadron (45 WS) to analyze the threat of natural or space vehicle-triggered lightning over a location. The second example is a launch and landing trajectory tool that produces a DGM file that plots the ground track of space vehicles during launch or landing. The trajectory tool can be used by SMG and the 45 WS forecasters to analyze weather radar imagery along a launch or landing trajectory. Advantages of both file types will be listed.

  4. Terminology Extraction from Log Files

    NASA Astrophysics Data System (ADS)

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

    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.

  5. 5 CFR 293.403 - Contents of employee performance files.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...Contents of employee performance files. 293.403...OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS...RECORDS Employee Performance File System Records...Contents of employee performance files. (a)...

  6. 76 FR 61094 - Combined Notice of Filings #1

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-03

    ...Operator, Inc. Description: New York Independent System Operator, Inc. submits tariff filing per 35: NYISO filing of tariff revisions per NYISO PJM settlement agreement to be effective 9/16/2010. Filed Date: 09/21/2011. Accession...

  7. 76 FR 35877 - Combined Notice of Filings #1

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-20

    ...Description: New York Independent System Operator, Inc. submits tariff filing per 35: NYISO Compliance Filing--Tariff Revisions, Minimum Oil Burn Settlement to be effective 5/1/2011. Filed Date: 06/09/2011. Accession Number:...

  8. Proposed database model and file structures for arthropod collection management

    E-print Network

    Mathis, Wayne N.

    Proposed database model and file structures for arthropod collection management Ronald A. In some mainframe based database management systems, it is possible to define repeating subsets for Arthropod Collection Management 4:3 Database File Descriptions Database file descriptions include

  9. QMDS: A File System Metadata Management Service Supporting a Graph Data Model-based

    E-print Network

    Maltzahn, Carlos

    Sasha Ames #1 , Maya B. Gokhale 2 , Carlos Maltzahn #3 # Computer Science Department University of a collection of photographic image and spectra files, and a cat- alog containing image and instrument metadata, photometric and spectroscopic object data. While the data size of the raw photographic imagery has grown from

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

    Microsoft Academic Search

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

    1993-01-01

    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

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

    E-print Network

    Panda, Dhabaleswar K.

    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

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

    E-print Network

    Shinjo, Yasushi

    allows users to create, delete and merge multiple execution environments of processes called ``worlds called ``worlds''. A world is a container of files and processes. A world is not only a unit of isolation a new child world from an existing parent world. The child world inherits all the contents of its parent

  13. Adding Secure Deletion to Your Favorite File System Nikolai Joukov and Erez Zadok

    E-print Network

    Zadok, Erez

    such as credit card or med­ ical records [7]. That is why government agencies and some businesses require proper) Abstract Files or even their names often contain confidential or secret information. Most users believe of it [6]. Even worse, floppy, flash, rewritable optical, and hard disks can be discarded, lost, or stolen

  14. Adding Secure Deletion to Your Favorite File System Nikolai Joukov and Erez Zadok

    E-print Network

    Zadok, Erez

    such as credit card or med- ical records [7]. That is why government agencies and some businesses require proper) Abstract Files or even their names often contain confidential or secret information. Most users believe of it [6]. Even worse, floppy, flash, rewritable optical, and hard disks can be discarded, lost, or stolen

  15. 47 CFR 1.1102 - Schedule of charges for applications and other filings in the wireless telecommunications services.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Commission's electronic filing and payment system “Fee Filer...00 PADM f. Extension of Construction Authority (Electronic Filing Required...00 PADM f. Extension of Construction Authority (Electronic Filing...

  16. 47 CFR 63.20 - Electronic filing, copies required; fees; and filing periods for international service providers.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Electronic filing, copies...CONTINUED) EXTENSION OF LINES, NEW...AGENCY STATUS Extensions and Supplements § 63.20 Electronic filing, copies...International Bureau Filing System (IBFS). A...

  17. 47 CFR 63.20 - Electronic filing, copies required; fees; and filing periods for international service providers.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Electronic filing, copies...CONTINUED) EXTENSION OF LINES, NEW...AGENCY STATUS Extensions and Supplements § 63.20 Electronic filing, copies...International Bureau Filing System (IBFS). A...

  18. 47 CFR 63.20 - Electronic filing, copies required; fees; and filing periods for international service providers.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Electronic filing, copies...CONTINUED) EXTENSION OF LINES, NEW...AGENCY STATUS Extensions and Supplements § 63.20 Electronic filing, copies...International Bureau Filing System (IBFS). A...

  19. 47 CFR 63.20 - Electronic filing, copies required; fees; and filing periods for international service providers.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Electronic filing, copies...CONTINUED) EXTENSION OF LINES, NEW...AGENCY STATUS Extensions and Supplements § 63.20 Electronic filing, copies...International Bureau Filing System (IBFS). A...

  20. 47 CFR 63.20 - Electronic filing, copies required; fees; and filing periods for international service providers.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Electronic filing, copies...CONTINUED) EXTENSION OF LINES, NEW...AGENCY STATUS Extensions and Supplements § 63.20 Electronic filing, copies...International Bureau Filing System (IBFS). A...

  1. 75 FR 38805 - Filing Via the Internet; Electronic Tariff Filings Notice of Display of Time on Commission's...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-06

    ...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...

  2. 12 CFR 303.221 - Filing procedures.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...AND RULES OF PRACTICE FILING PROCEDURES Section 19 of the FDI Act (Consent to Service of Persons Convicted of Certain Criminal...a) Where to file. An application under section 19 of the FDI Act shall be filed with the appropriate FDIC office....

  3. 12 CFR 303.221 - Filing procedures.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...AND RULES OF PRACTICE FILING PROCEDURES Section 19 of the FDI Act (Consent to Service of Persons Convicted of Certain Criminal...a) Where to file. An application under section 19 of the FDI Act shall be filed with the appropriate FDIC office....

  4. 12 CFR 303.221 - Filing procedures.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...AND RULES OF PRACTICE FILING PROCEDURES Section 19 of the FDI Act (Consent to Service of Persons Convicted of Certain Criminal...a) Where to file. An application under section 19 of the FDI Act shall be filed with the appropriate FDIC office....

  5. 12 CFR 303.221 - Filing procedures.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...AND RULES OF PRACTICE FILING PROCEDURES Section 19 of the FDI Act (Consent to Service of Persons Convicted of Certain Criminal...a) Where to file. An application under section 19 of the FDI Act shall be filed with the appropriate FDIC office....

  6. 12 CFR 303.221 - Filing procedures.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...AND RULES OF PRACTICE FILING PROCEDURES Section 19 of the FDI Act (Consent to Service of Persons Convicted of Certain Criminal...a) Where to file. An application under section 19 of the FDI Act shall be filed with the appropriate FDIC office....

  7. OMB No. 1615-0040; Expires 09/30/11 Applicant is filing under 274a.12

    E-print Network

    Rhode Island, University of

    .) (Country)5. Place of Birth (Town or City) (State/Province) 15. Current Immigration Status (Visitor, Student of perjury under the laws of the United States of America, that the foregoing is true and correct. Furthermore, I authorize the release of any information that U.S. Citizenship and Immigration Services needs

  8. 75 FR 29312 - Notice Regarding the Elimination of the Fee for Petitions To Make Special Filed Under the Patent...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-25

    ...set forth in 37 CFR 1.17(h). The PPH applications have proven, on average, to take significantly less time to prosecute...required petition fee under 37 CFR 1.17(h). The PPH has proven to be a useful work-sharing vehicle, as shown by the...

  9. A scalable infrastructure for CMS data analysis based on OpenStack Cloud and Gluster file system

    NASA Astrophysics Data System (ADS)

    Toor, S.; Osmani, L.; Eerola, P.; Kraemer, O.; Lindén, T.; Tarkoma, S.; White, J.

    2014-06-01

    The challenge of providing a resilient and scalable computational and data management solution for massive scale research environments requires continuous exploration of new technologies and techniques. In this project the aim has been to design a scalable and resilient infrastructure for CERN HEP data analysis. The infrastructure is based on OpenStack components for structuring a private Cloud with the Gluster File System. We integrate the state-of-the-art Cloud technologies with the traditional Grid middleware infrastructure. Our test results show that the adopted approach provides a scalable and resilient solution for managing resources without compromising on performance and high availability.

  10. Automated File Transfer and Storage Management Concepts for Space

    NASA Technical Reports Server (NTRS)

    Hogie, Keith; Criscuolo, Ed; Parise, Ron

    2004-01-01

    This presentation will summarize work that has been done to prototype and analyze approaches for automated file transfer and storage management for space missions. The concepts were prototyped in an environment with data files being generated at the target mission rates and stored in onboard files. The space-to-ground link was implemented using a channel simulator to introduce representative mission delays and errors. The system was operated for days with data files building up on the spacecraft and periodically being transferred to ground storage during a limited contact time. Overall performance was measured to identify limits under which the entire data volume could be transferred automatically while still fitting into the mission s limited contact time. The overall concepts, measurements, and results will be presented.

  11. DEPENDABILITY EVALUATION OF NETWORKED CONTROL SYSTEMS UNDER TRANSMISSION FAULTS

    E-print Network

    Paris-Sud XI, Université de

    DEPENDABILITY EVALUATION OF NETWORKED CONTROL SYSTEMS UNDER TRANSMISSION FAULTS Rony Ghostine for Automatic Control CNRS UMR 7039 2 avenue de la Foręt-de-Haye, 54516 Vandoeuvre, France, rony. In communication systems, these faults usually affect the medium leading to a transmission error. In (Barger, et al

  12. Nature of Proximate Mechanisms Underlying Primate Social Systems: Simplicity and

    E-print Network

    Reeder, DeeAnn M.

    Nature of Proximate Mechanisms Underlying Primate Social Systems: Simplicity and Redundancy SALLY P. MENDOZA, DEEANN M. REEDER, AND WILLIAM A. MASON Given the complexity of primate so- cial systems of social groups that primates form and maintain are characteristic of a given species.1 It is also clear

  13. Novel Detection Algorithm of IDMA System under Channel Estimation Error

    E-print Network

    Lee, Jae Hong

    Novel Detection Algorithm of IDMA System under Channel Estimation Error Chulhee Jang, Hyunwoo Choi, and Jae Hong Lee School of Electrical Engineering and INMC Seoul National University Seoul, Korea Email for the elementary signal estimator of an IDMA system considering channel estimation error. To develop the algorithm

  14. 29 CFR 15.303 - How does a Job Corps student file a claim for loss of or damages to personal property under the WIA?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...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...

  15. 29 CFR 15.303 - How does a Job Corps student file a claim for loss of or damages to personal property under the WIA?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false 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...

  16. FILE INTEGRITY CHECKERS: STATE OF THE ART AND BEST PRACTICES

    Microsoft Academic Search

    Yusuf M Motara; Barry Irwin

    Assuring that system files have not been tampered with over time is a vital, but oft- overlooked, aspect of system security. File integrity checkers provide ways to assure the validity of files on a system. This paper concerns itself with a review of file integrity checkers. It pays particular attention to what the minimum requirements for an integrity checker are,

  17. 28 CFR Appendix A to Part 58 - Guidelines for Reviewing Applications for Compensation and Reimbursement of Expenses Filed Under...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Meetings of Creditors: Preparing for...the conference of creditors, the § 341(a) meeting and other creditors' committee meetings...Management information systems review, installation...maintenance and reporting of...

  18. Geometric Programming optimization of deterministic inventory systems under multiple constraints

    E-print Network

    Foster, Ralph Emerson

    1967-01-01

    GEOMETRIC PROGRAivdqING OPTIMIZATION OF DETERMINISTIC INVENTORY SYSTEMS UNDER MULTIPLE CONSTRAINTS A Thesis By RALPH EMERSON FOSTER Submitted to the Graduate College of the Texas ASM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August, 1967 Major Subject: Industrial Engineering GEOMETRIC PROGRAMING OPTIMIZATION 01' DETERMTNI. , 'I'IC INVLNTORY SYSTLstS UNDER )1i, LTIY! E CONSTRAI, 'TS A Thesis By RALPH EMERSON I'OSTER Approved as to style...

  19. Density Functional Theory for Open System under a Finite Bias

    NASA Astrophysics Data System (ADS)

    Zhang, Chun; Cheng, Hai-Ping; Zhang, Xiaoguang

    2004-03-01

    One of the most important problems in studies of molecular electronics is to understand transport properties of molecules, which are connected to two leads under a finite bias. Various non-equilibrium first-principles methods, based on density functional theory (DFT), have been proposed to study the effects of the bias voltage on the current. In this work, we show that the total electron density alone can not determine the transport properties of an open system under a finite bias; the first Hohenberg-Kohn theorem becomes inapplicable . Hence, we introduce one additional variable, the non-equilibrium electron density, and show that two electron densities together completely determine a system under a finite bias. As a case study, we calculate the exchange energies of an uniform system under different bias voltages. The exchange energy depends on the total electron density as well as on the non-equilibrium electron density. We fit the numerical data to an exchange energy functional which can be applied to systems under a finite bias. Acknowledgment: Chun Zhang acknowledges support from the University of Florida in the form of an alumni fellowship. This work is supported by the Department of energy/Basic Science (contract DE-FG02-02ER45995). The authors acknowledge computing support from DOE/NERSC and the Oak Ridge Supercomputer Center.

  20. Bigfoot-NFS: A Parallel File-Striping NFS Server (Extended Abstract)

    Microsoft Academic Search

    Gene H. Kim; Ronald G. Minnich; Larry McVoy

    Bigfoot-NFS allows the transparent use of the aggregate space of multiple NFS file servers as a single file system. By presenting a single apparent file system to the user, Bigfoot-NFS allows the use of available storage without the maintenance overhead of tracking multiple mounted file systems. Unlike most other network parallel file systems, Bigfoot-NFS runs without a central \\

  1. Spectrum Sharing in Cognitive Radio Systems Under Outage Probablility Constraint

    E-print Network

    Cai, Pei Li

    2011-02-22

    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...

  2. Implementing MPI-IO atomic mode and shared file pointers using MPI one-sided communication.

    SciTech Connect

    Latham, R.; Ross, R.; Thakur, R.; Mathematics and Computer Science

    2007-07-01

    The ROMIO implementation of the MPI-IO standard provides a portable infrastructure for use on top of a variety of underlying storage targets. These targets vary widely in their capabilities, and in some cases additional effort is needed within ROMIO to support all MPI-IO semantics. Two aspects of the interface that can be problematic to implement are MPI-IO atomic mode and the shared file pointer access routines. Atomic mode requires enforcing strict consistency semantics, and shared file pointer routines require communication and coordination in order to atomically update a shared resource. For some file systems, native locks may be used to implement these features, but not all file systems have lock support. In this work, we describe algorithms for implementing efficient mutex locks using MPI-1 and the one-sided capabilities from MPI-2. We then show how these algorithms may be used to implement both MPI-IO atomic mode and shared file pointer methods for ROMIO without requiring any features from the underlying file system. We show that these algorithms can outperform traditional file system lock approaches. Because of the portable nature of these algorithms, they are likely useful in a variety of situations where distributed locking or coordination is needed in the MPI-2 environment.

  3. Usage analysis of user files in UNIX

    NASA Technical Reports Server (NTRS)

    Devarakonda, Murthy V.; Iyer, Ravishankar K.

    1987-01-01

    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.

  4. Compress Your Files

    ERIC Educational Resources Information Center

    Branzburg, Jeffrey

    2005-01-01

    File compression enables data to be squeezed together, greatly reducing file size. Why would someone want to do this? Reducing file size enables the sending and receiving of files over the Internet more quickly, the ability to store more files on the hard drive, and the ability pack many related files into one archive (for example, all files

  5. Integrated Postsecondary Education Data System (IPEDS): Fall Staff Data File 1995

    NSDL National Science Digital Library

    National Center for Education Statistics.

    1998-01-01

    The Fall Staff database contains detailed information on staffing for all Post-secondary institutions in the 50 states, the District of Columbia, and the outlying areas that are eligible to participate in Title IV federal financial aid programs. Information gathered from the IPEDS forms used to create this data file include: distribution of full- and part-time staff by primary occupation, sex, and race-ethnicity; full-time faculty by academic rank and tenure; full-time new hires by sex and race-ethnicity; and number of staff by employment status, primary occupation, and sex. Information on software requirements for reading the data is provided.

  6. The Effect of Client Caching on File Server Workloads

    Microsoft Academic Search

    Kevirz W. Froese; Richard B. Burit

    1996-01-01

    A distributed file systetn provides file service from one or rnore &red file servers to a community of clierit workstations o 'ver Q network. Wlaile the client- server paradigm has many advantages, it also presents new challenges to system designers concerning perfor- rnance and reliability. As both client workstations and file servers become increasingly well-resourced, a nu~n- ber of system

  7. Computational Hemodynamic Simulation of Human Circulatory System under Altered Gravity

    Microsoft Academic Search

    Chang Sung Kim; Cetin Kids; Dochan Kwak

    2004-01-01

    A computational hemodynamics approach is presented to simulate the blood flow through the human circulatory system under altered gravity conditions. Numerical techniques relevant to hemodynamics issues are introduced to non-Newtonian modeling for flow characteristics governed by red blood cells, distensible wall motion due to the heart pulse, and capillary bed modeling for outflow boundary conditions. Gravitational body force terms are

  8. Neural Systems Underlying Spatial Language in American Sign Language

    E-print Network

    Bellugi, Ursula

    Neural Systems Underlying Spatial Language in American Sign Language Karen Emmorey,*,1 Hanna the neural regions engaged in processing constructions unique to signed languages: classifier predicates Sign Language (ASL) preposition that described the spatial relation or to name the figure object

  9. Signed and Spoken Language: A Unique Underlying System?*

    E-print Network

    Mehler, Jacques

    333 Signed and Spoken Language: A Unique Underlying System?* SHARON PEPERKAM P and JACQUES M EHLER of the LANGUAGE AND SPEECH, 1999, 42 (2­3), 333­ 346 ABSTRACT Sign language has only recently become a topic fields; in particular, we compare spoken and signed language by looking at data concerning either

  10. Software Rejuvenation Policies for Cluster Systems under Varying Workload

    Microsoft Academic Search

    Wei Xie; Yiguang Hong; Kishor S. Trivedi

    2004-01-01

    We analyze two software rejuvenation policies of cluster server systems under varying workload, called fixed rejuvenation and delayed rejuvenation. In order to achieve a higher average throughput, we propose the delayed rejuvenation policy, which postpones the rejuvenation of individual nodes until off-peak hours. Analytic models using the well known paradigm of Markov chains are used. Since the size of the

  11. Performability analysis of clustered systems with rejuvenation under varying workload

    Microsoft Academic Search

    Dazhi Wang; Wei Xie; Kishor S. Trivedi

    This paper develops time-based rejuvenation policies to improve the performability measures of a cluster system. Three rejuvenation policies, namely standard rejuvenation, delayed rejuvenation and mixed rejuvenation, are designed to improve the cluster's performability under varying workload. Analytic models are built to evaluate these three policies. Since deterministic transitions are used in this paper and analytical models based on homogeneous continuous-time

  12. System Performances under Automation Degradation E. Hollnagel3

    E-print Network

    Boyer, Edmond

    System Performances under Automation Degradation (SPAD) E. Hollnagel3 , C. Martinie1 , P. Palanque1 of the project objectives augmented by some early findings. Abstract - Increased automation is one of the main changes foreseen by SESAR in ATM. This will pose new challenges including possible automation degradation

  13. 11. An abandoned electrical system was found under the pressedsteel ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. An abandoned electrical system was found under the pressed-steel ceiling. For some undetermined reason the pattern of the ceiling panels has 'photographed' onto the cardboard substrate. Two different panel designs were utilized in a checkerboard pattern. One panel of each design remains in place. Credit GADA/MRM. - Stroud Building, 31-33 North Central Avenue, Phoenix, Maricopa County, AZ

  14. "Women under the Influence": The System as the Cause.

    ERIC Educational Resources Information Center

    Moller, Lorraine

    2001-01-01

    Suggests "Woman Under the Influence" is an excellent film for teaching key concepts in family communication. Explains systems theory as it applies to transactions within the family. Extends the theory to the analysis of the spousal relationship in the film from the perspective of interactional communication, dramatically illustrating the…

  15. Logistics Management System Design under Pervasive Computing Environment

    Microsoft Academic Search

    Tiening Wang; Nansong Hu

    2010-01-01

    Pervasive computing as the third mode of computing is being applied in all aspects of life. The paper has given out a new design of logistic by using products and theory of pervasive. Design of modern logistics management system, under using of pervasive computing environment, will make Logistics industry achieve greater efficiency and more relaxed management environment.

  16. Transferring Files Between the Deep Impact Spacecrafts and the Ground Data System Using the CCSDS File Delivery Protocol (CFDP): A Case Study

    NASA Technical Reports Server (NTRS)

    Sanders, Felicia A.; Jones, Grailing, Jr.; Levesque, Michael

    2006-01-01

    The CCSDS File Delivery Protocol (CFDP) Standard could reshape ground support architectures by enabling applications to communicate over the space link using reliable-symmetric transport services. JPL utilized the CFDP standard to support the Deep Impact Mission. The architecture was based on layering the CFDP applications on top of the CCSDS Space Link Extension Services for data transport from the mission control centers to the ground stations. On July 4, 2005 at 1:52 A.M. EDT, the Deep Impact impactor successfully collided with comet Tempel 1. During the final 48 hours prior to impact, over 300 files were uplinked to the spacecraft, while over 6 thousand files were downlinked from the spacecraft using the CFDP. This paper uses the Deep Impact Mission as a case study in a discussion of the CFDP architecture, Deep Impact Mission requirements, and design for integrating the CFDP into the JPL deep space support services. Issues and recommendations for future missions using CFDP are also provided.

  17. Spectrum sharing under the asynchronous UPCS etiquette: The performance of collocated systems under heavy load

    Microsoft Academic Search

    Ivan Vukovic; John Mckown

    1997-01-01

    Recently the FCC opened three 10 MHz bands for unlicensed use. In order to operate in UPCS bands, devices must comply with\\u000a rules known as the UPCS etiquette (United States Code of Federal Regulations, Title 47, Part 15(d)). In this paper we study\\u000a channel sharing between two or more collocated systems under the asynchronous UPCS etiquette. In particular we show

  18. File concepts for parallel I/O

    NASA Technical Reports Server (NTRS)

    Crockett, Thomas W.

    1989-01-01

    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.

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

    SciTech Connect

    Moody, A; Bronevetsky, G

    2008-05-20

    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.

  20. Development of experimental systems for material sciences under microgravity

    NASA Technical Reports Server (NTRS)

    Tanii, Jun; Obi, Shinzo; Kamimiyata, Yotsuo; Ajimine, Akio

    1988-01-01

    As part of the Space Experiment Program of the Society of Japanese Aerospace Companies, three experimental systems (G452, G453, G454) have been developed for materials science studies under microgravity by the NEC Corporation. These systems are to be flown as Get Away Special payloads for studying the feasibility of producing new materials. Together with the experimental modules carrying the hardware specific to the experiment, the three systems all comprise standard subsystems consisting of a power supply, sequence controller, temperature controller, data recorder, and video recorder.

  1. More than Skin Deep: Measuring Effects of the Underlying Model on Access-Control System Usability

    E-print Network

    Reiter, Michael

    . For example, one rule may allow user u access to file f, while a second rule may deny group g, of which u Carnegie Mellon University Pittsburgh, PA kami@cmu.edu ABSTRACT In access-control systems, policy rules significant differences in accuracy in five of the six tasks we tested, including differences in accuracy

  2. Inverted File Compression through Document Identifier Reassignment.

    ERIC Educational Resources Information Center

    Shieh, Wann-Yun; Chen, Tien-Fu; Shann, Jean Jyh-Jiun; Chung, Chung-Ping

    2003-01-01

    Discusses the use of inverted files in information retrieval systems and proposes a document identifier reassignment method to reduce the average gap values in an inverted file. Highlights include the d-gap technique; document similarity; heuristic algorithms; file compression; and performance evaluation from a simulation environment. (LRW)

  3. A file transfer protocol and implementation

    Microsoft Academic Search

    B. Butscher; W. Heinze

    1979-01-01

    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

  4. Neural systems underlying approach and avoidance in anxiety disorders

    PubMed Central

    Robin L., Aupperle; Martin, P. Paulus

    2010-01-01

    Approach-avoidance conflict is an important psychological concept that has been used extensively to better understand cognition and emotion. This review focuses on neural systems involved in approach, avoidance, and conflict decision making, and how these systems overlap with implicated neural substrates of anxiety disorders. In particular, the role of amygdala, insula, ventral striatal, and prefrontal regions are discussed with respect to approach and avoidance behaviors. Three specific hypotheses underlying the dysfunction in anxiety disorders are proposed, including: (i) over-representation of avoidance valuation related to limbic overactivation; (ii) under- or over-representation of approach valuation related to attenuated or exaggerated striatal activation respectively; and (iii) insufficient integration and arbitration of approach and avoidance valuations related to attenuated orbitofrontal cortex activation. These dysfunctions can be examined experimentally using versions of existing decision-making paradigms, but may also require new translational and innovative approaches to probe approach-avoidance conflict and related neural systems in anxiety disorders. PMID:21319496

  5. Electroporation visualized under a multishot pulsed laser fluorescence microscope system

    NASA Astrophysics Data System (ADS)

    Itoh, Hiroyasu; Yu, Irene I. K.; Hibino, Masahiro; Hayakawa, Tsuyoshi; Kinosita, Kazuhiko, Jr.

    1993-10-01

    We describe a new fluorescence microscope system, which is the third generation of our pulsed-laser microscope systems developed for the purpose of capturing rapid cellular phenomena. Time resolution of this latest version is supported by the combination of a Q- switched Nd:YAG laser producing a burst of 4 pulses and a large format framing camera. We obtain series images at intervals on the order of 10 microsecond(s) with exposure times of 30 ns. With this multi-shot pulsed laser fluorescence microscope system, we examined the behavior of the transmembrane potential in a sea urchin egg under an intense electric field. Irreversible process of cell electroporation was revealed in serial images taken under a single electric pulse of microsecond duration.

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

    SciTech Connect

    Bronevetsky, G; Moody, A

    2009-08-18

    In the race to PetaFLOP-speed supercomputing systems, the increase in computational capability has been accompanied by corresponding increases in CPU count, total RAM, and storage capacity. However, a proportional increase in storage bandwidth has lagged behind. In order to improve system reliability and to reduce maintenance effort for modern large-scale systems, system designers have opted to remove node-local storage from the compute nodes. Today's multi-TeraFLOP supercomputers are typically attached to parallel file systems that provide only tens of GBs/s of I/O bandwidth. As a result, such machines have access to 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. In a many ways, the current I/O bottleneck limits the capabilities of modern supercomputers, specifically in terms of limiting their working sets and restricting fault tolerance techniques, which become critical on systems consisting of tens of thousands of components. This paper resolves the dilemma between high performance and high reliability by presenting an alternative system design which makes use of node-local storage to improve aggregate system I/O bandwidth. In this work, we focus on the checkpointing use-case and present an experimental evaluation of the Scalable Checkpoint/Restart (SCR) library, a new adaptive checkpointing library that uses node-local storage to significantly improve the checkpointing performance of large-scale supercomputers. Experiments show that SCR achieves unprecedented write speeds, reaching a measured 700GB/s of aggregate bandwidth on 8,752 processors and an estimated 1TB/s for a similarly structured machine of 12,500 processors. This corresponds to a speedup of over 70x compared to the bandwidth provided by the 10GB/s parallel file system the cluster uses. Further, SCR can adapt to an environment in which there is wide variation in performance or capacity among the individual node-local storage elements.

  7. 77 FR 15026 - Privacy Act of 1974; Farm Records File (Automated) System of Records

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-14

    ...Consolidated Financial Management Information Systems, Consolidated Natural Disaster Relief Programs, Consolidated Management System, Cooperative Marketing Association System, Cotton Management System, Customer...

  8. Machine-readable files developed for the High Plains Regional Aquifer-System analysis in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming

    USGS Publications Warehouse

    Ferrigno, C.F.

    1986-01-01

    Machine-readable files were developed for the High Plains Regional Aquifer-System Analysis project are stored on two magnetic tapes available from the U.S. Geological Survey. The first tape contains computer programs that were used to prepare, store, retrieve, organize, and preserve the areal interpretive data collected by the project staff. The second tape contains 134 data files that can be divided into five general classes: (1) Aquifer geometry data, (2) aquifer and water characteristics , (3) water levels, (4) climatological data, and (5) land use and water use data. (Author 's abstract)

  9. Machine-readable data files from the Madison Limestone and northern Great Plains regional aquifer system analysis projects, Montana, Nebraska, North Dakota, South Dakota, and Wyoming

    USGS Publications Warehouse

    Downey, J.S.

    1982-01-01

    Lists of machine-readable data files were developed for the Madison Limestone and Northern Great Plains Regional Aquifer System Analysis (RASA) projects. They are stored on magnetic tape and available from the U.S. Geological Survey. Record format, file content, and size are given for: (1) Drill-stem-test data for Paleozoic and Mesozoic formations, (2) geologic data from the Madison Limestone project, (3) data sets used in the regional simulation model, (4) head data for the Lower and Upper Cretaceous aquifers, and (5) geologic data for Mesozoic formations of the Northern Great Plains. (USGS)

  10. 20 CFR 30.101 - In general, how is a survivor's claim filed?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...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?...

  11. 20 CFR 30.101 - In general, how is a survivor's claim filed?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...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?...

  12. 20 CFR 30.101 - In general, how is a survivor's claim filed?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...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?...

  13. 20 CFR 30.101 - In general, how is a survivor's claim filed?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...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?...

  14. 20 CFR 30.101 - In general, how is a survivor's claim filed?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...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?...

  15. Support for Data-Intensive, Variable-Granularity Grid Applications via Distributed File System Virtualization - A Case Study of Light Scattering Spectroscopy

    Microsoft Academic Search

    Jithendar Paladugula; Ming Zhao; Renato J. O. Figueiredo

    2004-01-01

    A key challenge faced by large-scale, distributed applications in Grid environments is efficient, seamless data management. In particular, for applications that can benefit from access to data at variable granularities, data management can pose additional programming burdens to an application developer. This paper presents a case for the use of virtualized distributed file systems as a basis for data management

  16. Ceph: A Scalable, High-Performance Distributed File System Sage A. Weil Scott A. Brandt Ethan L. Miller Darrell D. E. Long

    E-print Network

    Maltzahn, Carlos

    Ceph: A Scalable, High-Performance Distributed File System Sage A. Weil Scott A. Brandt Ethan L intelligence by distributing data replica- tion, failure detection and recovery to semi-autonomous OSDs running detection, and recovery. Ceph uti- lizes a highly adaptive distributed metadata cluster ar- chitecture

  17. Fail-over file transfer process

    NASA Technical Reports Server (NTRS)

    Semancik, Susan K. (Inventor); Conger, Annette M. (Inventor)

    2005-01-01

    The present invention provides a fail-over file transfer process to handle data file transfer when the transfer is unsuccessful in order to avoid unnecessary network congestion and enhance reliability in an automated data file transfer system. If a file cannot be delivered after attempting to send the file to a receiver up to a preset number of times, and the receiver has indicated the availability of other backup receiving locations, then the file delivery is automatically attempted to one of the backup receiving locations up to the preset number of times. Failure of the file transfer to one of the backup receiving locations results in a failure notification being sent to the receiver, and the receiver may retrieve the file from the location indicated in the failure notification when ready.

  18. Test system of a small wind turbine under laboratory conditions

    Microsoft Academic Search

    Dongxiang Jiang; Qian Huang; Liangyou Hong

    2009-01-01

    As a clean, renewable, widely distributed, non-polluting energy, wind power plays an important role in the world's renewable energy development. In order to ensure the stable operation of wind turbines using non-grid-connected wind power, as well as the efficient utilization of wind resources, a study of condition monitoring of wind turbines is necessary. A test system of wind turbines under

  19. 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.

  20. Plutus: Scalable Secure File Sharing on Untrusted Storage

    Microsoft Academic Search

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

    2003-01-01

    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

  1. 76 FR 36912 - Combined Notice of Filings #1

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-23

    ...Independent System Operator, Inc. submits tariff filing per 35: NYISO Compliance Filing to Revise Specified Effective Date to be...tariff filing per 35.13(a)(2)(iii: 205 Filing of NYISO PJM JOA Schedules A and B to be effective 8/16/2011....

  2. 76 FR 59676 - Combined Notice of Filings #1

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-27

    ...Independent System Operator, Inc. submits tariff filing per 35: NYISO Compliance Filing to Correct EITC Fomula to be effective 5...tariff filing per 35: Compliance Filing of El Paso-Tucson Settlement, EL06-45-000, EL06-46- 000 to be effective...

  3. 10 CFR 2.302 - Filing of documents.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...the E-Filing system to file documents, serve other...www.nrc.gov/site-help/e-submittals.html...Group ID cannot be used to file documents. The Group...www.nrc.gov/site-help/e-submittals.html...participant is permitted to file electronic...

  4. File Management In Space

    NASA Technical Reports Server (NTRS)

    Critchfield, Anna R.; Zepp, Robert H.

    2000-01-01

    We propose that the user interact with the spacecraft as if the spacecraft were a file server, so that the user can select and receive data as files in standard formats (e.g., tables or images, such as jpeg) via the Internet. Internet technology will be used end-to-end from the spacecraft to authorized users, such as the flight operation team, and project scientists. The proposed solution includes a ground system and spacecraft architecture, mission operations scenarios, and an implementation roadmap showing migration from current practice to the future, where distributed users request and receive files of spacecraft data from archives or spacecraft with equal ease. This solution will provide ground support personnel and scientists easy, direct, secure access to their authorized data without cumbersome processing, and can be extended to support autonomous communications with the spacecraft.

  5. "The Bean Files."

    ERIC Educational Resources Information Center

    Haq, Krystyna; Longnecker, Nancy; Hickey, Ruth

    1999-01-01

    Describes classroom use and effectiveness of "The Bean Files," an internet package that uses humorous stories to introduce students to life on a wheat-sheep farm in the Mediterranean climate areas of Australia. The focus of the program is on the role of legume-cereal rotations in the farming system and the science underpinning this agricultural…

  6. ps file - Optimization Online

    E-print Network

    Polynomial systems arise in many fields of science and engineering, ranging from ... The nonlinearity of the homotopy continuation parameter t is also determined ..... parameters are provided in a parameter file for users to control the predictor ...... Noonberg, A neural network modeled by an adaptive Lotka-

  7. Entropic competition in polymeric systems under geometrical confinement

    E-print Network

    Arash Azari; Kristian K. Müller-Nedebock

    2014-08-22

    Using molecular dynamics simulation, we investigate the effect of confinement on a system comprises a mixture of inhomogeneous stiff segmented polymer chains where the length and stiffness of the segments vary among the chains. The translational and orientational entropy loss due to the confinement plays crucial role in arranging and self-organizing the chains which can be considered as a structural quality control tool to differentiate the components of the system under confinement. Due to the inhomogeneity, both weak and strong confinement regimes show the competition in the system and we see the segregation of chains like an {\\em entropic chromatography} device. As a consequence of the curvature, chain at periphery shows higher angular mobility than other chains, despite its radial suppression.

  8. 29 CFR 1979.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Filing of discrimination complaint. 1979.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 519 OF...Orders § 1979.103 Filing of discrimination complaint. (a) Who may...

  9. 29 CFR 1981.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Filing of discrimination complaint. 1981.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 6 OF THE...Orders § 1981.103 Filing of discrimination complaint. (a) Who may...

  10. 32 CFR 776.12 - Maintenance of files.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...OF THE NAVY MISCELLANEOUS RULES PROFESSIONAL CONDUCT OF ATTORNEYS PRACTICING UNDER...776.12 Maintenance of files. Ethics complaint records shall be maintained... (b) Local command files regarding professional responsibility complaints will not...

  11. 29 CFR 1979.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Filing of discrimination complaint. 1979.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 519 OF...Orders § 1979.103 Filing of discrimination complaint. (a) Who may...

  12. 29 CFR 1980.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Filing of discrimination complaint. 1980.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 806 OF...Orders § 1980.103 Filing of discrimination complaint. (a) Who may...

  13. 29 CFR 1979.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Filing of discrimination complaint. 1979.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 519 OF...Orders § 1979.103 Filing of discrimination complaint. (a) Who may...

  14. 29 CFR 1979.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Filing of discrimination complaint. 1979.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 519 OF...Orders § 1979.103 Filing of discrimination complaint. (a) Who may...

  15. 29 CFR 1981.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Filing of discrimination complaint. 1981.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 6 OF THE...Orders § 1981.103 Filing of discrimination complaint. (a) Who may...

  16. 29 CFR 1979.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Filing of discrimination complaint. 1979.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 519 OF...Orders § 1979.103 Filing of discrimination complaint. (a) Who may...

  17. 29 CFR 1981.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Filing of discrimination complaint. 1981.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 6 OF THE...Orders § 1981.103 Filing of discrimination complaint. (a) Who may...

  18. 29 CFR 1981.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Filing of discrimination complaint. 1981.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 6 OF THE...Orders § 1981.103 Filing of discrimination complaint. (a) Who may...

  19. 29 CFR 1981.103 - Filing of discrimination complaint.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Filing of discrimination complaint. 1981.103 Section... PROCEDURES FOR THE HANDLING OF DISCRIMINATION COMPLAINTS UNDER SECTION 6 OF THE...Orders § 1981.103 Filing of discrimination complaint. (a) Who may...

  20. Sustainable infrastructure system modeling under uncertainties and dynamics

    NASA Astrophysics Data System (ADS)

    Huang, Yongxi

    Infrastructure systems support human activities in transportation, communication, water use, and energy supply. The dissertation research focuses on critical transportation infrastructure and renewable energy infrastructure systems. The goal of the research efforts is to improve the sustainability of the infrastructure systems, with an emphasis on economic viability, system reliability and robustness, and environmental impacts. The research efforts in critical transportation infrastructure concern the development of strategic robust resource allocation strategies in an uncertain decision-making environment, considering both uncertain service availability and accessibility. The study explores the performances of different modeling approaches (i.e., deterministic, stochastic programming, and robust optimization) to reflect various risk preferences. The models are evaluated in a case study of Singapore and results demonstrate that stochastic modeling methods in general offers more robust allocation strategies compared to deterministic approaches in achieving high coverage to critical infrastructures under risks. This general modeling framework can be applied to other emergency service applications, such as, locating medical emergency services. The development of renewable energy infrastructure system development aims to answer the following key research questions: (1) is the renewable energy an economically viable solution? (2) what are the energy distribution and infrastructure system requirements to support such energy supply systems in hedging against potential risks? (3) how does the energy system adapt the dynamics from evolving technology and societal needs in the transition into a renewable energy based society? The study of Renewable Energy System Planning with Risk Management incorporates risk management into its strategic planning of the supply chains. The physical design and operational management are integrated as a whole in seeking mitigations against the potential risks caused by feedstock seasonality and demand uncertainty. Facility spatiality, time variation of feedstock yields, and demand uncertainty are integrated into a two-stage stochastic programming (SP) framework. In the study of Transitional Energy System Modeling under Uncertainty, a multistage stochastic dynamic programming is established to optimize the process of building and operating fuel production facilities during the transition. Dynamics due to the evolving technologies and societal changes and uncertainty due to demand fluctuations are the major issues to be addressed.

  1. Discontinuous solutions to hyperbolic systems under operator splitting

    NASA Technical Reports Server (NTRS)

    Roe, P. L.

    1987-01-01

    Two-dimensional systems of linear hyperbolic equations are studied with regard to their behavior under a solution strategy that in alternate time-steps solves exactly the component one-dimensional operators. The initial data is a step function across an oblique discontinuity. The manner in which this discontinuity breaks up under repeated applications of the split operator is analyzed, and it is shown that the split solution will fail to match the true solution in any case where the two operators do not share all their eigenvectors. The special case of the fluid flow equations is analyzed in more detail, and it is shown that arbitrary initial data gives rise to pseudo acoustic waves and a non-physical stationary wave. The implications of these findings for the design of high-resolution computing schemes are discussed.

  2. A robotic assistant system for cardiac interventions under MRI guidance

    NASA Astrophysics Data System (ADS)

    Li, Ming; Mazilu, Dumitru; Wood, Bradford J.; Horvath, Keith A.; Kapoor, Ankur

    2010-02-01

    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.

  3. Protocol: EBI Phylogeny 1. From the course website under the Data link (http://theory.bio.uu.nl/BPA/Data/) download the file

    E-print Network

    Utrecht, Universiteit

    and CIOIN) and insects (fruit fly (DROME) and mosquito (AEDAE)). 2. To construct a phylogenetic tree, you first need to align the sequences. Make an alignment using ClustalW (http that slow (or full) algorithm is chosen. Click Submit. 3. For the next step you need the alignment file

  4. 7 CFR 47.25 - Filing; extensions of time; effective date of filing; computations of time; official notice.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... false Filing; extensions of time; effective...Department of Agriculture AGRICULTURAL MARKETING SERVICE...MARKETING OF PERISHABLE AGRICULTURAL COMMODITIES RULES...UNDER THE PERISHABLE AGRICULTURAL COMMODITIES ACT ...47.25 Filing; extensions of time;...

  5. The deep hydrogeologic flow system underlying the Oak Ridge Reservation

    SciTech Connect

    Nativ, R. [Hebrew Univ., Jerusalem (IL); Hunley, A.E. [Oak Ridge National Lab., TN (United States)

    1993-07-01

    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.

  6. 77 FR 56839 - California Independent System Operator Corporation; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-14

    ...EL12-40-001] California Independent System Operator Corporation; Notice...on July 9, 2012, California Independent System Operator Corporation submitted...June 8, 2012 Order, California Independent System Operator Corporation,...

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

    Microsoft Academic Search

    Alan Jay Smith

    1981-01-01

    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

  8. Extreme value laws in dynamical systems under physical observables

    NASA Astrophysics Data System (ADS)

    Holland, Mark P.; Vitolo, Renato; Rabassa, Pau; Sterk, Alef E.; Broer, Henk W.

    2012-03-01

    Extreme value theory for chaotic deterministic dynamical systems is a rapidly expanding area of research. Given a system and a real function (observable) defined on its phase space, extreme value theory studies the limit probabilistic laws obeyed by large values attained by the observable along orbits of the system. Based on this theory, the so-called block maximum method is often used in applications for statistical prediction of large value occurrences. In this method, one performs statistical inference for the parameters of the Generalised Extreme Value (GEV) distribution, using maxima over blocks of regularly sampled observable values along an orbit of the system. The observables studied so far in the theory are expressed as functions of the distance with respect to a point, which is assumed to be a density point of the system’s invariant measure. However, at least with respect to the ambient (usually Euclidean) metric, this is not the structure of the observables typically encountered in physical applications, such as windspeed or vorticity in atmospheric models. In this paper we consider extreme value limit laws for observables which are not expressed as functions of the distance (in the ambient metric) from a density point of the dynamical system. In such cases, the limit laws are no longer determined by the functional form of the observable and the dimension of the invariant measure: they also depend on the specific geometry of the underlying attractor and of the observable’s level sets. We present a collection of analytical and numerical results, starting with a toral hyperbolic automorphism as a simple template to illustrate the main ideas. We then formulate our main results for a uniformly hyperbolic system, the solenoid map. We also discuss non-uniformly hyperbolic examples of maps (Hénon and Lozi maps) and of flows (the Lorenz63 and Lorenz84 models). Our purpose is to outline the main ideas and to highlight several serious problems found in the numerical estimation of the limit laws.

  9. Viewing Files

    Cancer.gov

    In addition to standard HTML Web pages, our Web sites sometimes contain other file formats. You may need additional software or browser plug-ins to view some of the information available on our sites. The following lists show each format, along with links

  10. EQPT, a data file preprocessor for the EQ3/6 software package: User`s guide and related documentation (Version 7.0); Part 2

    SciTech Connect

    Daveler, S.A.; Wolery, T.J.

    1992-12-17

    EQPT is a data file preprocessor for the EQ3/6 software package. EQ3/6 currently contains five primary data files, called datao files. These files comprise alternative data sets. These data files contain both standard state and activity coefficient-related data. Three (com, sup, and nea) support the use of the Davies or B-dot equations for the activity coefficients; the other two (hmw and pit) support the use of Pitzer`s (1973, 1975) equations. The temperature range of the thermodynamic data on these data files varies from 25{degrees}C only to 0-300{degrees}C. The principal modeling codes in EQ3/6, EQ3NR and EQ6, do not read a data0 file, however. Instead, these codes read an unformatted equivalent called a data1 file. EQPT writes a datal file, using the corresponding data0 file as input. In processing a data0 file, EQPT checks the data for common errors, such as unbalanced reactions. It also conducts two kinds of data transformation. Interpolating polynomials are fit to data which are input on temperature adds. The coefficients of these polynomials are then written on the datal file in place of the original temperature grids. A second transformation pertains only to data files tied to Pitzer`s equations. The commonly reported observable Pitzer coefficient parameters are mapped into a set of primitive parameters by means of a set of conventional relations. These primitive form parameters are then written onto the datal file in place of their observable counterparts. Usage of the primitive form parameters makes it easier to evaluate Pitzer`s equations in EQ3NR and EQ6. EQPT and the other codes in the EQ3/6 package are written in FORTRAN 77 and have been developed to run under the UNIX operating system on computers ranging from workstations to supercomputers.

  11. 78 FR 8506 - Combined Notice of Filings #2

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-06

    ...Description: New York Independent System Operator, Inc. submits NYISO Compliance Filing re: definition of the term ``blind trust...Description: New York Independent System Operator, Inc. submits NYISO Compliance Filing re: the term, ``blind trust'' in...

  12. 76 FR 30932 - Combined Notice of Filings #2

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-27

    ...Notice of Filings 2 Take notice that the Commission received the following electric rate filings: Docket Numbers: ER11-2048-004. Applicants: New York Independent System Operator, Inc. Description: New York Independent System Operator,...

  13. Evaluation of two cooling systems under a firefighter coverall.

    PubMed

    Teunissen, Lennart P J; Wang, Li-Chu; Chou, Shih-Nung; Huang, Chin-Hsien; Jou, Gwo-Tsuen; Daanen, Hein A M

    2014-11-01

    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

  14. Mathematical modeling of the behavior of geothermal systems under exploitation

    SciTech Connect

    Bodvarsson, G.S.

    1982-01-01

    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.

  15. Disconnected Operation in the Coda File System James J. Kistler and M. Satyanarayanan

    E-print Network

    Han, Richard Y.

    concurrent, Division (AFSC), U.S. Air Force, Wright-Patterson AFB, Ohio, 45433-6543 under fine granularity. It is specifically notThis work was supported by the Defense Advanced Research Projects Agency (Avionics Lab, Wright

  16. Site Enforcement Tracking System (SETS) (National) EZ-Base (trade name) Version 7. 3 (for microcomputers). Data file

    SciTech Connect

    Not Available

    1992-05-01

    When expending Superfund monies at a CERCLA (Comprehensive Environmental Response, Compensation and Liability Act) site, EPA must conduct a search to identify parties with potential financial responsibility for remediation of uncontrolled hazardous waste sites. EPA regional Superfund Waste Management Staff issue a notice letter to the potentially responsible party (PRP). Data from the notice letter is used to form the Site Enforcement Tracking System (SETS). The data includes PRP name and address, a company contact person, the date the notice was issued, and the related CERCLA site name and identification number. SETS was created by EPA to track PRP identification at both NPL (National Priorities List) and non-NPL sites. SETS does not address the range of other administrative duties related to tracking the PRP. These lists represent EPA's preliminary findings on the identities of PRPs. EZ-Base(TM) is a relational data base management system that utilizes a WordPerfect(R) interface and requires no programming skills to either convert or input databases. EZ-Base(TM) allows users to output selected records to merge files for reports or directly to printer. Selections may be made on any combination of field content criteria such as: site identification codes; site name; NPL flag; Potentially Responsible Party (PRP); addressee; title; address; city; state; ZIP notification date GNL and SNL.

  17. On the Exponentiality of Stochastic Linear Systems under the MaxPlus Algebra

    E-print Network

    Chang, Cheng-Shang

    On the Exponentiality of Stochastic Linear Systems under the Max­Plus Algebra Cheng­Shang Chang linear systems under the max­plus algebra. For such a system, the states are governed by the recursive in queueing networks [2, 5] to stochastic linear systems under the max­plus algebra. For such a system

  18. Propulsion system assessment for very high UAV under ERAST

    NASA Technical Reports Server (NTRS)

    Bettner, James L.; Blandford, Craig S.; Rezy, Bernie J.

    1995-01-01

    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.

  19. SIDS-toADF File Mapping Manual

    NASA Technical Reports Server (NTRS)

    McCarthy, Douglas; Smith, Matthew; Poirier, Diane; Smith, Charles A. (Technical Monitor)

    2002-01-01

    The "CFD General Notation System" (CGNS) consists of a collection of conventions, and conforming software, for the storage and retrieval of Computational Fluid Dynamics (CFD) data. It facilitates the exchange of data between sites and applications, and helps stabilize the archiving of aerodynamic data. This effort was initiated in order to streamline the procedures in exchanging data and software between NASA and its customers, but the goal is to develop CGNS into a National Standard for the exchange of aerodynamic data. The CGNS development team is comprised of members from Boeing Commercial Airplane Group, NASA-Ames, NASA-Langley, NASA-Lewis, McDonnell-Douglas Corporation (now Boeing-St. Louis), Air Force-Wright Lab., and ICEM-CFD Engineering. The elements of CGNS address all activities associated with the storage of data on external media and its movement to and from application programs. These elements include: 1) The Advanced Data Format (ADF) Database manager, consisting of both a file format specification and its I/O software, which handles the actual reading and writing of data from and to external storage media; 2) The Standard Interface Data Structures (SIDS), which specify the intellectual content of CFD data and the conventions governing naming and terminology; 3) The SIDS-to-ADF File Mapping conventions, which specify the exact location where the CFD data defined by the SIDS is to be stored within the ADF file(s); and 4) The CGNS Mid-level Library, which provides CFD-knowledgeable routines suitable for direct installation into application codes. The SIDS-toADF File Mapping Manual specifies the exact manner in which, under CGNS conventions, CFD data structures (the SIDS) are to be stored in (i.e., mapped onto) the file structure provided by the database manager (ADF). The result is a conforming CGNS database. Adherence to the mapping conventions guarantees uniform meaning and location of CFD data within ADF files, and thereby allows the construction of universal software to read and write the data.

  20. Speed of disentanglement in multiqubit systems under a depolarizing channel

    SciTech Connect

    Zhang, Fu-Lin, E-mail: flzhang@tju.edu.cn; Jiang, Yue; Liang, Mai-Lin, E-mail: mailinliang@yahoo.com.cn

    2013-06-15

    We investigate the speed of disentanglement in the multiqubit systems under the local depolarizing channel, in which each qubit is independently coupled to the environment. We focus on the bipartition entanglement between one qubit and the remaining qubits constituting the system, which is measured by the negativity. For the two-qubit system, the speed for the pure state completely depends on its entanglement. The upper and lower bounds of the speed for arbitrary two-qubit states, and the necessary conditions for a state achieving them, are obtained. For the three-qubit system, we study the speed for pure states, whose entanglement properties can be completely described by five local-unitary-transformation invariants. An analytical expression of the relation between the speed and the invariants is derived. The speed is enhanced by the three-tangle which is the entanglement among the three qubits, but reduced by the two-qubit correlations outside the concurrence. The decay of the negativity can be restrained by the other two negativity with the coequal sense. The unbalance between two qubits can reduce the speed of disentanglement of the remaining qubit in the system, and even can retrieve the entanglement partially. For the k-qubit systems in an arbitrary superposition of Greenberger–Horne–Zeilinger state and W state, the speed depends almost entirely on the amount of the negativity when k increases to five or six. An alternative quantitative definition for the robustness of entanglement is presented based on the speed of disentanglement, with comparison to the widely studied robustness measured by the critical amount of noise parameter where the entanglement vanishes. In the limit of large number of particles, the alternative robustness of the Greenberger–Horne–Zeilinger-type states is inversely proportional to k, and the one of the W states approaches 1/?(k)

  1. System for Processing Coded OFDM Under Doppler and Fading

    NASA Technical Reports Server (NTRS)

    Tsou, Haiping; Darden, Scott; Lee, Dennis; Yan, Tsun-Yee

    2005-01-01

    An advanced communication system has been proposed for transmitting and receiving coded digital data conveyed as a form of quadrature amplitude modulation (QAM) on orthogonal frequency-division multiplexing (OFDM) signals in the presence of such adverse propagation-channel effects as large dynamic Doppler shifts and frequency-selective multipath fading. Such adverse channel effects are typical of data communications between mobile units or between mobile and stationary units (e.g., telemetric transmissions from aircraft to ground stations). The proposed system incorporates novel signal processing techniques intended to reduce the losses associated with adverse channel effects while maintaining compatibility with the high-speed physical layer specifications defined for wireless local area networks (LANs) as the standard 802.11a of the Institute of Electrical and Electronics Engineers (IEEE 802.11a). OFDM is a multi-carrier modulation technique that is widely used for wireless transmission of data in LANs and in metropolitan area networks (MANs). OFDM has been adopted in IEEE 802.11a and some other industry standards because it affords robust performance under frequency-selective fading. However, its intrinsic frequency-diversity feature is highly sensitive to synchronization errors; this sensitivity poses a challenge to preserve coherence between the component subcarriers of an OFDM system in order to avoid intercarrier interference in the presence of large dynamic Doppler shifts as well as frequency-selective fading. As a result, heretofore, the use of OFDM has been limited primarily to applications involving small or zero Doppler shifts. The proposed system includes a digital coherent OFDM communication system that would utilize enhanced 802.1la-compatible signal-processing algorithms to overcome effects of frequency-selective fading and large dynamic Doppler shifts. The overall transceiver design would implement a two-frequency-channel architecture (see figure) that would afford frequency diversity for reducing the adverse effects of multipath fading. By using parallel concatenated convolutional codes (also known as Turbo codes) across the dual-channel and advanced OFDM signal processing within each channel, the proposed system is intended to achieve at least an order of magnitude improvement in received signal-to-noise ratio under adverse channel effects while preserving spectral efficiency.

  2. 77 FR 9226 - Physical Systems Integration, LLC; Supplemental Notice That Initial Market-Based Rate Filing...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-16

    ...Commission [Docket No. ER12-1013-000] Physical Systems Integration, LLC; Supplemental Notice That Initial Market-Based Rate...in the above-referenced proceeding of Physical Systems Integration, LLC's application for market-based rate...

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

    SciTech Connect

    SPENCER, S.G.

    1999-04-26

    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.

  4. Connections: using context to enhance file search

    Microsoft Academic Search

    Craig A. N. Soules; Gregory R. Ganger

    2005-01-01

    Connections is a file system search tool that combines traditional content-based search with context information gathered from user activity. By tracing file system calls, Connections can identify temporal relationships between files and use them to expand and reorder traditional content search results. Doing so improves both recall (reducing false-positives) and precision (reducing false-negatives). For example, Connections improves the average recall

  5. 5 CFR 1201.134 - Deciding official; filing stay request; serving documents on parties.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...Personnel MERIT SYSTEMS PROTECTION...motion for extension or termination...filing and service. The...submitted in electronic form. ...filings and service. Each...certificate of service. (g) Electronic filing....

  6. 5 CFR 1201.134 - Deciding official; filing stay request; serving documents on parties.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...Personnel MERIT SYSTEMS PROTECTION...motion for extension or termination...filing and service. The...submitted in electronic form. ...filings and service. Each...certificate of service. (g) Electronic filing...

  7. 5 CFR 1201.134 - Deciding official; filing stay request; serving documents on parties.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...Personnel MERIT SYSTEMS PROTECTION...motion for extension or termination...filing and service. The...submitted in electronic form. ...filings and service. Each...certificate of service. (g) Electronic filing....

  8. 48 CFR 304.803-70 - Contract/order file organization and use of checklists.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...order file organization and use of checklists. 304.803-70 Section 304.803-70 Federal Acquisition Regulations System...ADMINISTRATIVE MATTERS Government Contract Files 304.803-70 Contract/order file organization...

  9. 48 CFR 304.803-70 - Contract/order file organization and use of checklists.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...order file organization and use of checklists. 304.803-70 Section 304.803-70 Federal Acquisition Regulations System...ADMINISTRATIVE MATTERS Government Contract Files 304.803-70 Contract/order file organization...

  10. 29 CFR 1611.13 - Specific Exemptions-Charge and complaint files

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2), systems EEOC-1 (Age and Equal Pay Act Discrimination Case Files...Discrimination in Employment Act, the Equal Pay Act, the Americans with Disabilities...the files in EEOC-1 (Age and Equal Pay Act Discrimination Case Files),...

  11. 29 CFR 1611.13 - Specific Exemptions-Charge and complaint files

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2), systems EEOC-1 (Age and Equal Pay Act Discrimination Case Files...Discrimination in Employment Act, the Equal Pay Act, the Americans with Disabilities...the files in EEOC-1 (Age and Equal Pay Act Discrimination Case Files),...

  12. 29 CFR 1611.13 - Specific Exemptions-Charge and complaint files

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2), systems EEOC-1 (Age and Equal Pay Act Discrimination Case Files...Discrimination in Employment Act, the Equal Pay Act, the Americans with Disabilities...the files in EEOC-1 (Age and Equal Pay Act Discrimination Case Files),...

  13. 29 CFR 1611.13 - Specific Exemptions-Charge and complaint files

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2), systems EEOC-1 (Age and Equal Pay Act Discrimination Case Files...Discrimination in Employment Act, the Equal Pay Act, the Americans with Disabilities...the files in EEOC-1 (Age and Equal Pay Act Discrimination Case Files),...

  14. 29 CFR 1611.13 - Specific Exemptions-Charge and complaint files

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2), systems EEOC-1 (Age and Equal Pay Act Discrimination Case Files...Discrimination in Employment Act, the Equal Pay Act, the Americans with Disabilities...the files in EEOC-1 (Age and Equal Pay Act Discrimination Case Files),...

  15. Computer program modifications of Open-file report 82-1065; a comprehensive system for interpreting seismic-refraction and arrival-time data using interactive computer methods

    USGS Publications Warehouse

    Ackermann, Hans D.; Pankratz, Leroy W.; Dansereau, Danny A.

    1983-01-01

    The computer programs published in Open-File Report 82-1065, A comprehensive system for interpreting seismic-refraction arrival-time data using interactive computer methods (Ackermann, Pankratz, and Dansereau, 1982), have been modified to run on a mini-computer. The new version uses approximately 1/10 of the memory of the initial version, is more efficient and gives the same results.

  16. A Comparison of the Canal Centering Ability of ProFile, K3, and RaCe Nickel Titanium Rotary Systems

    Microsoft Academic Search

    Dina Al-Sudani; Saad Al-Shahrani

    2006-01-01

    The purpose of this investigation was to compare the ability of three Nickel Titanium (NiTi) rotary systems (ProFile, K3, and RaCe) to centralize instrumentation relative to the original canal location and to determine the distance of transportation of these canals. Sixty mesial root canals mandibular molars with curvature ranging from 15 to 40 degrees were selected. The canals were divided

  17. Plasticity of the Arabidopsis root system under nutrient deficiencies.

    PubMed

    Gruber, Benjamin D; Giehl, Ricardo F H; Friedel, Swetlana; von Wirén, Nicolaus

    2013-09-01

    Plant roots show a particularly high variation in their morphological response to different nutrient deficiencies. Although such changes often determine the nutrient efficiency or stress tolerance of plants, it is surprising that a comprehensive and comparative analysis of root morphological responses to different nutrient deficiencies has not yet been conducted. Since one reason for this is an inherent difficulty in obtaining nutrient-deficient conditions in agar culture, we first identified conditions appropriate for producing nutrient-deficient plants on agar plates. Based on a careful selection of agar specifically for each nutrient being considered, we grew Arabidopsis (Arabidopsis thaliana) plants at four levels of deficiency for 12 nutrients and quantified seven root traits. In combination with measurements of biomass and elemental concentrations, we observed that the nutritional status and type of nutrient determined the extent and type of changes in root system architecture (RSA). The independent regulation of individual root traits further pointed to a differential sensitivity of root tissues to nutrient limitations. To capture the variation in RSA under different nutrient supplies, we used principal component analysis and developed a root plasticity chart representing the overall modulations in RSA under a given treatment. This systematic comparison of RSA responses to nutrient deficiencies provides a comprehensive view of the overall changes in root plasticity induced by the deficiency of single nutrients and provides a solid basis for the identification of nutrient-sensitive steps in the root developmental program. PMID:23852440

  18. [Individual systemic reactions of human organism under acute hypoxia].

    PubMed

    Soroko, S I; Burykh, É A; Bekshaev, S S; Rozhkov, V P; Bo?ko, E R

    2012-11-01

    Results of physiological and biochemical study including analysis of brain electrical activity dynamics, volumetric and linear parameters of cerebral blood flow, plasma stress hormones levels (adrenaline, noradrenaline, cortisol) and energy metabolism markers (glucose, lactate) at different stages of acute normobaric hypoxia are presented. The correlations are shown between alterations of main cerebral arteries tone and resistivity type vessels, as well as between changes in linear and volumetric cerebral blood flow providing a compensation of the oxygen deficit. Features of EEG dynamics were investigated that characterized CNS regulatory functions and brain electrogenesis disturbance under deep stages of hypoxia. By means of original evaluating methods of interaction structure between different EEG rhythm, EEG markers were obtained that revealed both brain intercentral interaction rearrangements and functional disintegration of systemic brain activity at various stages of acute hypoxia. PMID:23431769

  19. CineFiles

    NSDL National Science Digital Library

    The Pacific Film Archives at Berkeley has been collecting all types of film ephemera for decades. Over the past few years, they have worked to place this material online for the use of film historians and persons with a general interest in cinema. The CineFiles site serves as a database of reviews, press kits, festival and showcase program notes, newspaper articles and other documents from their collection. On their homepage, visitors can perform simple searches, or also perform a filmographic search to search for films by title, subject, genre, and so on. To get visitors started, they have included several sample searches that will be most illustrative. From a 1927 Variety review of Buster Keaton's masterpiece film "College" to an interview with John Cassavetes regarding his 1974 film "A Woman Under the Influence", the CineFiles collection is quite engaging and useful.

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

    PubMed Central

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

    2014-01-01

    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

  1. 20 CFR 30.100 - In general, how does an employee file an initial claim for benefits?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...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 § 30.100 In general, how does an employee file an initial claim...

  2. 20 CFR 30.100 - In general, how does an employee file an initial claim for benefits?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...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 § 30.100 In general, how does an employee file an initial claim...

  3. 20 CFR 30.100 - In general, how does an employee file an initial claim for benefits?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...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 § 30.100 In general, how does an employee file an initial claim...

  4. 20 CFR 30.100 - In general, how does an employee file an initial claim for benefits?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...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 § 30.100 In general, how does an employee file an initial claim...

  5. 20 CFR 30.100 - In general, how does an employee file an initial claim for benefits?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...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 § 30.100 In general, how does an employee file an initial claim...

  6. 1569364319 1 Abstract--Large Peer-to-Peer (P2P) systems for file transfer

    E-print Network

    Jayasumana, Anura P.

    -wide behavior. These communities are unable to benefit significantly from performance enhancement schemes to a given destination. Fur- thermore, the solution is adaptive to changing popularity and user interests, and even sensors. Current systems are designed based on either the system-wide behavior, attempting

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

    SciTech Connect

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

    2009-01-01

    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.

  8. Microleakage under orthodontic brackets bonded with different adhesive systems

    PubMed Central

    Alkis, Huseyin; Turkkahraman, Hakan; Adanir, Necdet

    2015-01-01

    Objective: This in vitro study aimed to compare the microleakage of orthodontic brackets between enamel-adhesive and adhesive-bracket interfaces at the occlusal and gingival margins bonded with different adhesive systems. Materials and Methods: A total of 144 human maxillary premolar teeth extracted for orthodontic reasons was randomly divided into four groups. Each group was then further divided into three sub-groups. Three total-etching bonding systems (Transbond XT, Greengloo and Kurasper F), three one-step self-etching bonding systems (Transbond Plus SEP, Bond Force and Clearfil S3), three two-step self-etching bonding systems (Clearfil SE Bond, Clearfil Protectbond and Clearfil Liner Bond), and three self-adhesive resin cements (Maxcem Elite, Relyx U 100 and Clearfil SA Cement) were used to bond the brackets to the teeth. After bonding, all teeth were sealed with nail varnish and stained with 0.5% basic fuchsine for 24 h. All samples were sectioned and examined under a stereomicroscope to score for microleakage at the adhesive–enamel and adhesive–bracket interfaces from both occlusal and gingival margins. Statistical Analysis Used: Statistical analyses were performed with Kruskal–Wallis and Wilcoxon signed-rank tests. Results: The results indicate no statistically significant differences between the microleakage scores of the adhesives; microleakage was detected in all groups. Comparison of the average values of the microleakage scores in the enamel–adhesive and adhesive–bracket interfaces indicated statistically significant differences (P < 0.05). The amount of the microleakage was higher at the enamel–adhesive interface than at the bracket-adhesive interface. Conclusions: All of the brackets exhibited some amount of microleakage. This result means that microleakage does not depend on the type of adhesive used. PMID:25713494

  9. GDCT Initialization File [gdct.ini] Format Specification Guide

    E-print Network

    Rosebrugh, Robert

    Help Files. · The colors available under the GDCT application for the purposes of animation are redAColor = red catBColor = red [Recent Files] recent1 = E:\\GDCT\\cgl\\test.cgl recent2 = EGDCT Initialization File [gdct.ini] Format Specification Guide Written By: Jeremy Bradbury June 22

  10. ACCIDENT, ILLNESS AND INJURY AND EMPLOYMENT SELF-EXTRACTING FILES

    EPA Science Inventory

    Files containing information of accidents, illnesses and injuries of miners. These "self-extracting" files are the actual information (raw data) from the accident and injury MSHA Form 7000-2 filed with MSHA by mining operators and contractors as required under the 30 CFR Part 50....

  11. Computational Hemodynamic Simulation of Human Circulatory System under Altered Gravity

    NASA Technical Reports Server (NTRS)

    Kim. Chang Sung; Kiris, Cetin; Kwak, Dochan

    2003-01-01

    A computational hemodynamics approach is presented to simulate the blood flow through the human circulatory system under altered gravity conditions. Numerical techniques relevant to hemodynamics issues are introduced to non-Newtonian modeling for flow characteristics governed by red blood cells, distensible wall motion due to the heart pulse, and capillary bed modeling for outflow boundary conditions. Gravitational body force terms are added to the Navier-Stokes equations to study the effects of gravity on internal flows. Six-type gravity benchmark problems are originally presented to provide the fundamental understanding of gravitational effects on the human circulatory system. For code validation, computed results are compared with steady and unsteady experimental data for non-Newtonian flows in a carotid bifurcation model and a curved circular tube, respectively. This computational approach is then applied to the blood circulation in the human brain as a target problem. A three-dimensional, idealized Circle of Willis configuration is developed with minor arteries truncated based on anatomical data. Demonstrated is not only the mechanism of the collateral circulation but also the effects of gravity on the distensible wall motion and resultant flow patterns.

  12. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 false Commission's remedy for school systems...Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION RECORDKEEPING AND REPORTING...Information Report § 1602.43 Commission's remedy for school...

  13. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Commission's remedy for school systems...Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION RECORDKEEPING AND REPORTING...Information Report § 1602.43 Commission's remedy for school...

  14. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Commission's remedy for school systems...Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION RECORDKEEPING AND REPORTING...Information Report § 1602.43 Commission's remedy for school...

  15. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Commission's remedy for school systems...Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION RECORDKEEPING AND REPORTING...Information Report § 1602.43 Commission's remedy for school...

  16. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 2011-07-01 false Commission's remedy for school systems...Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION RECORDKEEPING AND REPORTING...Information Report § 1602.43 Commission's remedy for school...

  17. An Overview of the Parallel Virtual File System Walter B. Ligon III Robert B. Ross

    E-print Network

    aspects of the PVFS system and presents recent performance results on a 64 node Beowulf workstation of the design and features of PVFS, present some of our latest measurements of performance on a Beowulf

  18. An Empirical Study of a Highly Available File System Brian D. Noble M. Satyanarayanan

    E-print Network

    Research and Development Center, Aeronautical Systems Division (AFSC), U.S. Air Force, Wright­Patterson AFB provided by Coda for mobile computing. This work has been supported by the Avionics Laboratory, Wright

  19. Disconnected Operation in the Coda File System James J. Kistler and M. Satyanarayanan

    E-print Network

    Krishnamurthy, Arvind

    for applications that exhibit highly concurrent, Division (AFSC), U.S. Air Force, Wright­Patterson AFB, Ohio, 45433 Projects Agency (Avionics Lab, Wright Research and Development Center, Aeronautical Systems intended

  20. Leafhopper control in filed-grown red maples with systemic insecticides

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Red maple, a popular landscape tree, can be susceptible to foliar damage caused by potato leafhopper feeding. Typical potato leafhopper injury includes distorted leaf tissue and reduced shoot growth. This research identified systemic neonicotinoid insecticides, Allectus and Discus, which controlled...