WorldWideScience

Sample records for file system based

  1. Building Hot Snapshot Copy Based on Windows File System

    Institute of Scientific and Technical Information of China (English)

    WANG Lina; GUO Chi; WANG Dejun; ZHU Qin

    2006-01-01

    This paper describes a method for building hot snapshot copy based on windows-file system (HSCF). The architecture and running mechanism of HSCF are discussed after giving a comparison with other on-line backup technology. HSCF, based on a file system filter driver, protects computer data and ensures their integrity and consistency with following three steps:access to open files, synchronization and copy-on-write. Its strategies for improving system performance are analyzed including priority setting, incremental snapshot and load balance. HSCF is a new kind of snapshot technology to solve the data integrity and consistency problem in online backup, which is different from other storage-level snapshot and Open File Solution.

  2. Delay Scheduling Based Replication Scheme for Hadoop Distributed File System

    Directory of Open Access Journals (Sweden)

    S. Suresh

    2015-03-01

    Full Text Available The data generated and processed by modern computing systems burgeon rapidly. MapReduce is an important programming model for large scale data intensive applications. Hadoop is a popular open source implementation of MapReduce and Google File System (GFS. The scalability and fault-tolerance feature of Hadoop makes it as a standard for BigData processing. Hadoop uses Hadoop Distributed File System (HDFS for storing data. Data reliability and faulttolerance is achieved through replication in HDFS. In this paper, a new technique called Delay Scheduling Based Replication Algorithm (DSBRA is proposed to identify and replicate (dereplicate the popular (unpopular files/blocks in HDFS based on the information collected from the scheduler. Experimental results show that, the proposed method achieves 13% and 7% improvements in response time and locality over existing algorithms respectively.

  3. Collective operations in a file system based execution model

    Science.gov (United States)

    Shinde, Pravin; Van Hensbergen, Eric

    2013-02-19

    A mechanism is provided for group communications using a MULTI-PIPE synthetic file system. A master application creates a multi-pipe synthetic file in the MULTI-PIPE synthetic file system, the master application indicating a multi-pipe operation to be performed. The master application then writes a header-control block of the multi-pipe synthetic file specifying at least one of a multi-pipe synthetic file system name, a message type, a message size, a specific destination, or a specification of the multi-pipe operation. Any other application participating in the group communications then opens the same multi-pipe synthetic file. A MULTI-PIPE file system module then implements the multi-pipe operation as identified by the master application. The master application and the other applications then either read or write operation messages to the multi-pipe synthetic file and the MULTI-PIPE synthetic file system module performs appropriate actions.

  4. Management Concerns for Optical Based Filing Systems

    Science.gov (United States)

    1990-03-01

    terminals, WORM Palo Alto, CA 94303 drives, optical jukeboxes, printers, scanners. Candi Technology Inc. Systems integrators providing 2354 Calle Del Mundo ...n.3, p. 68, 6 February 1989. Dortch, M., "A Storage Media Primer ", LAN Times, v.6, n.1, pp. 38-39, January 1989. Dukeman, John, "Optical Disk - A

  5. Storing files in a parallel computing system based on user or application specification

    Science.gov (United States)

    Faibish, Sorin; Bent, John M.; Nick, Jeffrey M.; Grider, Gary; Torres, Aaron

    2016-03-29

    Techniques are provided for storing files in a parallel computing system based on a user-specification. A plurality of files generated by a distributed application in a parallel computing system are stored by obtaining a specification from the distributed application indicating how the plurality of files should be stored; and storing one or more of the plurality of files in one or more storage nodes of a multi-tier storage system based on the specification. The plurality of files comprise a plurality of complete files and/or a plurality of sub-files. The specification can optionally be processed by a daemon executing on one or more nodes in a multi-tier storage system. The specification indicates how the plurality of files should be stored, for example, identifying one or more storage nodes where the plurality of files should be stored.

  6. The storage system of PCM based on random access file system

    Science.gov (United States)

    Han, Wenbing; Chen, Xiaogang; Zhou, Mi; Li, Shunfen; Li, Gezi; Song, Zhitang

    2016-10-01

    Emerging memory technologies such as Phase change memory (PCM) tend to offer fast, random access to persistent storage with better scalability. It's a hot topic of academic and industrial research to establish PCM in storage hierarchy to narrow the performance gap. However, the existing file systems do not perform well with the emerging PCM storage, which access storage medium via a slow, block-based interface. In this paper, we propose a novel file system, RAFS, to bring about good performance of PCM, which is built in the embedded platform. We attach PCM chips to the memory bus and build RAFS on the physical address space. In the proposed file system, we simplify traditional system architecture to eliminate block-related operations and layers. Furthermore, we adopt memory mapping and bypassed page cache to reduce copy overhead between the process address space and storage device. XIP mechanisms are also supported in RAFS. To the best of our knowledge, we are among the first to implement file system on real PCM chips. We have analyzed and evaluated its performance with IOZONE benchmark tools. Our experimental results show that the RAFS on PCM outperforms Ext4fs on SDRAM with small record lengths. Based on DRAM, RAFS is significantly faster than Ext4fs by 18% to 250%.

  7. Development of 2D casting process CAD system based on PDF/image files

    Institute of Scientific and Technical Information of China (English)

    Tang Hongtao; Zhou Jianxin; Wang Lin; Liao Dunming; Tao Qing

    2014-01-01

    A casting process CAD is put forward to design and draw casting process. The 2D casting process CAD, most of the current systems are developed based on one certain version of the AutoCAD system. However the application of these 2D casting process CAD systems in foundry enterprises are restricted because they have several deficiencies, such as being overly dependent on the AutoCAD system, and some part files based on PDF format can not be opened directly. To overcome these deficiencies, for the first time an innovative 2D casting process CAD system based on PDF and image format file has been proposed, which breaks through the traditional research and application notion of the 2D casting process CAD system based on AutoCAD. Several key technologies of this system such as coordinate transformation, CAD interactive drawing, file storage, PDF and image format files display, and image recognition technologies were described in detail. A practical 2D CAD casting process system named HZCAD2D(PDF) was developed, which is capable of designing and drawing the casting process on the part drawing based on the PDF format directly, without spending time on drawing the part produced by AutoCAD system. Final y, taking two actual castings as examples, the casting processes were drawn using this system, demonstrating that this system can significantly shorten the cycle of casting process designing.

  8. Organization of the Inverted Files in a Distributed Information Retrieval System Based on Thesauri.

    Science.gov (United States)

    Mazur, Zygmunt

    1986-01-01

    Describes how operations on local inverted files are to be modified in order to use them in distributed information retrieval systems based on thesauri. The presented rules may be viewed as the logical approach in implementing a distributed retrieval system consisting of n local retrieval systems. (Author/MBR)

  9. Generalized File Management Systems: Their Implication for a California Junior College Data Base System.

    Science.gov (United States)

    Fedrick, Robert John

    Criteria to use in evaluating data processing efficiency, factors of file and record definitions, convenience of use for non-programmers, report generating capabilities, and customer support for generalized file management systems for use by the California junior colleges are indicated by the author. The purchase of such a system at the state…

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

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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.

  12. The Design of Medical Consumable Filing System Based on RFID Technology

    Institute of Scientific and Technical Information of China (English)

    WU Min; ZHONG Tian-ping; TANG Li-ming; QIN Xian; HUANG Ya-ping

    2015-01-01

    Objective: With the modern information technology, much management problems in the records of medical equipment and hospital supplies have been solved to achieve a comprehensive, real-time and accurate management. Methods: The import BARCODE file archiving system, in order to borrow and return series operation of the automatic identification, set the expiration of contracts, licenses and time of alarms. Results: The efficiency and accuracy of data entry, and mobile data collection terminal data processing in real time. Conclusion: Based on RFID technology for medical equipment supplies the file system to the radio channel as a transmission media, the target for non-contact automatic identification technology, medical equipment, supplies, intelligent file management and information technology.

  13. Further implementation of the user space file system based on CastorFS and Xrootd

    CERN Document Server

    Jiao, Manjun

    The LHC (Large Hadron Collider) experiments use a mass storage system for recording petabytes of experimental data. This system is called CASTOR[1] (CERN Advanced STORage manager) and it is powerful and convenient for many use cases. However, it is impossible to use standard tools and scripts straight away for dealing with the files in the system since the users can access the data just in the way of using command-line utilities and parsing their output. Thus a complete POSIX filesystem – CastorFS[2] is developed based on the FUSE[3] (File System in Userspace) and two CASTOR I/O libraries-RFIO (Remote File I/O) library and NS (Name Server) library. Although it is applied successfully, it has serious limitation of wide application because the I/O protocols it relies on are very old. Each time the CASTOR side receives the calling for accessing data files from the user side, the load of the CASTOR side system will increase quickly even out of its upper bound and the system would crash. Besides that, those two ...

  14. Dynamic Metadata Management in Semantic File Systems

    Directory of Open Access Journals (Sweden)

    T. Anand

    2015-03-01

    Full Text Available The progression in data capacity and difficulty inflicts great challenges for file systems. To address these contests, an inventive namespace management scheme is in distracted need to deliver both the ease and competence of data access. For scalability, each server makes only local, autonomous decisions about relocation for load balancing. Associative access is provided by a traditional extension to present tree-structured file system conventions, and by protocols that are intended specifically for content based access.Rapid attributebased accesstofile system contents is fulfilled by instinctive extraction and indexing of key properties of file system objects. The programmed indexing of files and calendars is called “semantic” because user programmable transducers use data about the semantics of efficient file system objects to extract the properties for indexing. Tentative results from a semantic file system execution support the thesis that semantic file systems present a more active storage abstraction than do traditional tree planned file systems for data sharing and command level programming. Semantic file system is executed as a middleware in predictable file systems and works orthogonally with categorized directory trees. The semantic relationships and file groups recognized in file systems can also be used to facilitate file prefetching among other system-level optimizations. Allencompassing trace-driven experiments on our sample implementation validate the efficiency and competence.

  15. Evolutionary Game Theory-Based Evaluation of P2P File-Sharing Systems in Heterogeneous Environments

    Directory of Open Access Journals (Sweden)

    Yusuke Matsuda

    2010-01-01

    Full Text Available Peer-to-Peer (P2P file sharing is one of key technologies for achieving attractive P2P multimedia social networking. In P2P file-sharing systems, file availability is improved by cooperative users who cache and share files. Note that file caching carries costs such as storage consumption and processing load. In addition, users have different degrees of cooperativity in file caching and they are in different surrounding environments arising from the topological structure of P2P networks. With evolutionary game theory, this paper evaluates the performance of P2P file sharing systems in such heterogeneous environments. Using micro-macro dynamics, we analyze the impact of the heterogeneity of user selfishness on the file availability and system stability. Further, through simulation experiments with agent-based dynamics, we reveal how other aspects, for example, synchronization among nodes and topological structure, affect the system performance. Both analytical and simulation results show that the environmental heterogeneity contributes to the file availability and system stability.

  16. File System Virtual Appliances

    Science.gov (United States)

    2010-05-01

    some of my closest friendships. Ashraf, Ippo and Neil made life much more fun. Mike Merideth introduced me to fine scotch, hi-fi speakers, and piano ...system virtual appliances (4) We analyze the sources of latency in traditional inter-VM communica- tion techniques and present a novel energy- and...tiple file system implementations within the Sun UNIX kernel” [52]. This was achieved through two techniques . First, outside the file system layer

  17. Decay data file based on the ENSDF file

    Energy Technology Data Exchange (ETDEWEB)

    Katakura, J. [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    1997-03-01

    A decay data file with the JENDL (Japanese Evaluated Nuclear Data Library) format based on the ENSDF (Evaluated Nuclear Structure Data File) file was produced as a tentative one of special purpose files of JENDL. The problem using the ENSDF file as primary source data of the JENDL decay data file is presented. (author)

  18. Formalizing a Hierarchical File System

    NARCIS (Netherlands)

    Hesselink, Wim H.; Lali, M.I.

    2009-01-01

    In this note, we define an abstract file system as a partial function from (absolute) paths to data. Such a file system determines the set of valid paths. It allows the file system to be read and written at a valid path, and it allows the system to be modified by the Unix operations for removal (rm)

  19. Formalizing a hierarchical file system

    NARCIS (Netherlands)

    Hesselink, Wim H.; Lali, Muhammad Ikram

    2012-01-01

    An abstract file system is defined here as a partial function from (absolute) paths to data. Such a file system determines the set of valid paths. It allows the file system to be read and written at a valid path, and it allows the system to be modified by the Unix operations for creation, removal, a

  20. Design of NAND FLASH File System Based on Loss of Balance Algorithm

    Directory of Open Access Journals (Sweden)

    Jinwu Ju

    2011-02-01

    Full Text Available NAND FLASH is a commonly large capacity memory, which used in embedded systems .It often used to store the operating system kernel and file system. NAND FLASH memory has a limited number of block erase feature. Built file system in NAND FLASH, loss of balance method should be adopted. A balanced system of block erase operation, can extend the life of NAND FLASH and improve overall system reliability. The paper analyzes the characteristics of NAND FLASH work .presents a loss of balance algorithm which used in NAND FLASH memory , and given out the implementation of the algorithm design method.

  1. Peer selecting model based on FCM for wireless distributed P2P files sharing systems

    Institute of Scientific and Technical Information of China (English)

    LI Xi; JI Hong; ZHENG Rui-ming

    2010-01-01

    Ⅱn order to improve the performance of wireless distributed peer-to-peer(P2P)files sharing systems,a general system architecture and a novel peer selecting model based on fuzzy cognitive maps(FCM)are proposed in this paper.The new model provides an effective approach on choosing an optimal peer from several resource discovering results for the best file transfer.Compared with the traditional rain-hops scheme that uses hops as the only selecting criterion,the proposed model uses FCM to investigate the complex relationships among various relative factors in wireless environments and gives an overall evaluation score on the candidate.It also has strong scalability for being independent of specified P2P resource discovering protocols.Furthermore,a complete implementation is explained in concrete modules.The simulation results show that the proposed model is effective and feasible compared with rain-hops scheme,with the success transfer rate increased by at least20% and transfer time improved as high as 34%.

  2. 76 FR 2368 - Balance Power Systems, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2011-01-13

    ... Energy Regulatory Commission Balance Power Systems, LLC; Supplemental Notice That Initial Market-Based... supplemental notice in the above-referenced proceeding of Balance Power Systems, LLC's application for market... 20426. The filings in the above-referenced proceeding are accessible in the Commission's eLibrary...

  3. File Transfer Algorithm for Autonomous Decentralized System

    Institute of Scientific and Technical Information of China (English)

    GUI Xun; TAN Yong-dong; Qian Qing-quan

    2008-01-01

    A file transfer algorithm based on ADP (autonomous decentralized protocol) was proposed to solve the problem that the ADS (autonomous decentralized system) middleware (NeXUS/Dlink) lacks of file transfer functions for Windows. The algorithm realizes the peer-to-peer file transfer, one-to-N inquiry/multi-response file transfer and one-to-N file distribution in the same data field based on communication patterns provided by the ADP. The peer-to-peer file transfer is implemented through a peer-to-peer communication path, one-to-N inquiry/multi-response file transfer and one-to-N file distribution are implemented through multicast commtmieation. In this algorithm, a file to be transferred is named with a GUID ( global unique identification), every data packet is marked with a sequence number, and file-receiving in parallel is implemented by caching DPOs (data processing objects) and multithread technologies. The algorithm is applied in a simulation system of the decentralized control platform, and the test results and long time stable mrming prove the feasibility of the algorithm.

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

    Science.gov (United States)

    Metzger, Zvi

    2014-09-01

    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.

  5. A Mobile P2P File Sharing System Based on File Routing Table%一种基于文件路由表的移动P2P文件共享系统

    Institute of Scientific and Technical Information of China (English)

    樊里略; 苏文莉; 陈佳

    2012-01-01

    A P2P file sharing system for the mobile environment is designed. Based on the file routing table, file search scheme and transfer protocol are presented. The system is able to control file transferring self-adaptively and guarantee the complete file downloading when the nodes move out of the transferring range or leave system dynamically. The simulation results show that the file search scheme and transfer protocol in M-P2PFS outperform the approaches in P2P file sharing system in wire internet such as Gnutella. The M-P2PFS has high file searching accuracy and file transferring success rate.%设计了一种移动环境中的P2P文件共享系统(Mobile P2P File Sharing System,M-P2PFS),提出了基于节点文件路由表的文件搜索策略和传输协议,使得在有节点移动和动态退出情况下,文件传输过程能自适应调整,保证文件下载的完整性.通过实验表明M-P2PFS系统具有较好的性能,能保证较高的文件搜索准确率和文件传输成功率.

  6. 基于安全操作系统的透明加密文件系统的设计%Design and Implementation of a Transparent Cryptographic File System Based on Secure Operating System

    Institute of Scientific and Technical Information of China (English)

    魏丕会; 卿斯汉; 刘海峰

    2003-01-01

    Almost all the important information is saved on physical media as files and managed by file system. Sofilesystem's security is an important promise to information security. We present a transparent cryptographic file sys-tem based on secure operating system(SecTCFS). The users do not aware the exist of the encrypting process. Au-thentication promises that valid user can access the files in the system.

  7. Mixed-Media File Systems

    NARCIS (Netherlands)

    Bosch, Hendrikus Gerardus Petrus

    1999-01-01

    This thesis addresses the problem of implementing mixed-media storage systems. In this work a mixed-media file system is defined to be a system that stores both conventional (best-effort) file data and real-time continuous-media data. Continuous-media data is usually bulky, and servers storing and r

  8. PFS: A Distributed and Customizable File System

    NARCIS (Netherlands)

    Bosch, Peter

    1996-01-01

    In this paper we present our ongoing work on the Pegasus File System (PFS), a distributed and customizable file system that can be used for off-line file system experiments and on-line file system storage. PFS is best described as an object-oriented component library from which either a true file sy

  9. Design and Implementation of File Access and Control System Based on Dynamic Web

    Institute of Scientific and Technical Information of China (English)

    GAO Fuxiang; YAO Lan; BAO Shengfei; YU Ge

    2006-01-01

    A dynamic Web application, which can help the departments of enterprise to collaborate with each other conveniently, is proposed. Several popular design solutions are introduced at first. Then, dynamic Web system is chosen for developing the file access and control system. Finally, the paper gives the detailed process of the design and implementation of the system, which includes some key problems such as solutions of document management and system security. Additionally, the limitations of the system as well as the suggestions of further improvement are also explained.

  10. Non-volatile main memory management methods based on a file system.

    Science.gov (United States)

    Oikawa, Shuichi

    2014-01-01

    There are upcoming non-volatile (NV) memory technologies that provide byte addressability and high performance. PCM, MRAM, and STT-RAM are such examples. Such NV memory can be used as storage because of its data persistency without power supply while it can be used as main memory because of its high performance that matches up with DRAM. There are a number of researches that investigated its uses for main memory and storage. They were, however, conducted independently. This paper presents the methods that enables the integration of the main memory and file system management for NV memory. Such integration makes NV memory simultaneously utilized as both main memory and storage. The presented methods use a file system as their basis for the NV memory management. We implemented the proposed methods in the Linux kernel, and performed the evaluation on the QEMU system emulator. The evaluation results show that 1) the proposed methods can perform comparably to the existing DRAM memory allocator and significantly better than the page swapping, 2) their performance is affected by the internal data structures of a file system, and 3) the data structures appropriate for traditional hard disk drives do not always work effectively for byte addressable NV memory. We also performed the evaluation of the effects caused by the longer access latency of NV memory by cycle-accurate full-system simulation. The results show that the effect on page allocation cost is limited if the increase of latency is moderate.

  11. Introduction to Hadoop Distributed File System

    Directory of Open Access Journals (Sweden)

    Vaibhav Gopal korat

    2012-04-01

    Full Text Available HDFS is a distributed file system designed to hold very large amounts of data (terabytes or even petabytes, and provide high-throughput access to this information. Files are stored in a redundant fashion across multiple machines to ensure their durability to failure and high availability to very parallel applications. This paper includes the step by step introduction to the file system to distributed file system and to the Hadoop Distributed File System. Section I introduces What is file System, Need of File System, Conventional File System, its advantages, Need of Distributed File System, What is Distributed File System and Benefits of Distributed File System. Also the analysis of large dataset and comparison of mapreducce with RDBMS, HPC and Grid Computing communities have been doing large-scale data processing for years. Sections II introduce the concept of Hadoop Distributed File System. Lastly section III contains Conclusion followed with the References.

  12. Empowering file-based radio production through media asset management systems

    Science.gov (United States)

    Muylaert, Bjorn; Beckers, Tom

    2006-10-01

    In recent years, IT-based production and archiving of media has matured to a level which enables broadcasters to switch over from tape- or CD-based to file-based workflows for the production of their radio and television programs. This technology is essential for the future of broadcasters as it provides the flexibility and speed of execution the customer demands by enabling, among others, concurrent access and production, faster than real-time ingest, edit during ingest, centrally managed annotation and quality preservation of media. In terms of automation of program production, the radio department is the most advanced within the VRT, the Flemish broadcaster. Since a couple of years ago, the radio department has been working with digital equipment and producing its programs mainly on standard IT equipment. Historically, the shift from analogue to digital based production has been a step by step process initiated and coordinated by each radio station separately, resulting in a multitude of tools and metadata collections, some of them developed in-house, lacking integration. To make matters worse, each of those stations adopted a slightly different production methodology. The planned introduction of a company-wide Media Asset Management System allows a coordinated overhaul to a unified production architecture. Benefits include the centralized ingest and annotation of audio material and the uniform, integrated (in terms of IT infrastructure) workflow model. Needless to say, the ingest strategy, metadata management and integration with radio production systems play a major role in the level of success of any improvement effort. This paper presents a data model for audio-specific concepts relevant to radio production. It includes an investigation of ingest techniques and strategies. Cooperation with external, professional production tools is demonstrated through a use-case scenario: the integration of an existing, multi-track editing tool with a commercially available

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

    Science.gov (United States)

    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.

  14. Value-Based File Retention: File Attributes as File Value and Information Waste Indicators

    NARCIS (Netherlands)

    Wijnhoven, Fons; Amrit, Chintan; Dietz, Pim

    2014-01-01

    Several file retention policy methods propose that a file retention policy should be based on file value. Though such a retention policy might increase the value of accessible files, the method to arrive at such a policy is underresearched. This article discusses how one can arrive at a method for d

  15. Digital Libraries: The Next Generation in File System Technology.

    Science.gov (United States)

    Bowman, Mic; Camargo, Bill

    1998-01-01

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

  16. Analyzing Service Rates for File Transfers in Peer-to-peer File Sharing Systems

    Institute of Scientific and Technical Information of China (English)

    WANG Kai; PAN Li; LI Jian-hua

    2008-01-01

    When examining the file transfer performance in a peer-to-peer file sharing system, a fundamental problem is how to describe the service rate for a file transfer.In this paper, the problem is examined by analyzing the distribution of server-like nodes' upstream-bandwidth among their concurrent transfers.A sufficient condition for the service rate, what a receiver obtains for downloading a file, to asymptotically be uniform is presented.On the aggregate service rate for transferring a file in a system, a sufficient condition for it to asymptotically follow a Zipf distribution is presented.These asymptotic equalities are both in the mean square sense.These analyses and the sufficient conditions provide a mathematic base for modeling file transfer processes in peer-to-peer file sharing systems.

  17. A Reputation System with Anti-Pollution Mechanism in P2P File Sharing Systems

    OpenAIRE

    Qi Mei; Guo Yajun; Yan Huifang

    2009-01-01

    File pollution has become a very serious problem in peer-to-peer file sharing systems, because of which it greatly reduces the effectiveness of systems. Users downloaded pollution files not only consumed bandwidth, but were also likely to share polluted files without checking. If these polluted files carry a virus, Trojan horse, or other malicious code, the loss of users would be disastrous. There is much research done on reputation-based anti-pollution mechanisms. Peer reputation systems and...

  18. A Reputation System with Anti-Pollution Mechanism in P2P File Sharing Systems

    OpenAIRE

    Qi Mei; Guo Yajun; Yan Huifang

    2009-01-01

    File pollution has become a very serious problem in peer-to-peer file sharing systems, because of which it greatly reduces the effectiveness of systems. Users downloaded pollution files not only consumed bandwidth, but were also likely to share polluted files without checking. If these polluted files carry a virus, Trojan horse, or other malicious code, the loss of users would be disastrous. There is much research done on reputation-based anti-pollution mechanisms. Peer reputation systems and...

  19. Optimizing Input/Output Using Adaptive File System Policies

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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.

  1. Cut-and-paste file-systems: integrating simulators and file-systems

    NARCIS (Netherlands)

    Bosch, Peter; Mullender, Sape J.

    1996-01-01

    We have implemented an integrated and configurable file system called the PFS and a trace-driven file-system simulator called Patsy. Patsy is used for off-line analysis of file-system algorithms, PFS is used for on-line file-system data storage. Algorithms are first analyzed in Patsy and when we are

  2. 一个基于NOW的跨平台并行文件系统的设计和实现%The Design and Implementation of a Parallel File System Based on The Heterogeneous Network of Workstation

    Institute of Scientific and Technical Information of China (English)

    赵欣; 陈道蓄; 谢立

    2000-01-01

    To improve the I/O performance of a parallel system, we designed and implemented a Parallcl File System Based On The Heterogeneous Network Of Wcrkstation(PFSHNOW). It is a cross-plat-form parallel file system,and has some characteristics such as parallelism, efficiency, cross-platform, convenience of management, and intelligence. This article described the model of the PFSHNOW and the advanced technique used in the file system. At the end, we also gave the result of evaluation.

  3. Cut-and-paste file-systems: integrating simulators and file systems

    NARCIS (Netherlands)

    Bosch, Peter; Mullender, Sape J.

    1995-01-01

    We have implemented an integrated and configurable file system called the Pegasus filesystem (PFS) and a trace-driven file-system simulator called Patsy. Patsy is used for off-line analysis of file-systemalgorithms, PFS is used for on-line file-systemdata storage. Algorithms are first analyzed in Pa

  4. A Design of the Files Management System Based on RFID%一种基于RFID的文件管理系统设计方案

    Institute of Scientific and Technical Information of China (English)

    李敬红

    2011-01-01

    This paper deals with some security problems existing in secret files especially paper medium file management and secret file management system is designed and realized based on the RFID technology. By use of file monitor and safety alarm measure in this system, high efficient and safe management for secret files is realized and incidence rate of the case of leakage of a secret is decreased, and eventuallly the idea of monitoring and managing secret files in paper meadium by utilization of automated equipment is realized.%针对涉密文件特别是纸介质文件管理上存在的安全问题,基于RFID技术设计实现了涉密文件管理系统.该系统采用了文件监控与安全报警的方法,实现涉密文件高效安全的管理,降低了泄密事件的发生率,实现了利用自动化设备对纸介质涉密文件进行监控管理的设想.

  5. Verifying compiled file system code

    OpenAIRE

    Mühlberg, Jan Tobias; Lüttgen, Gerald

    2011-01-01

    This article presents a case study on retrospective verification of the Linux Virtual File System (VFS), which is aimed at checking violations of API usage rules and memory properties. Since VFS maintains dynamic data structures and is written in a mixture of C and inlined assembly, modern software model checkers cannot be applied. Our case study centres around our novel automated software verification tool, the SOCA Verifier, which symbolically executes and analyses compi...

  6. DIGITAL ONCOLOGY PATIENT RECORD - HETEROGENEOUS FILE BASED APPROACH

    Directory of Open Access Journals (Sweden)

    Nikolay Sapundzhiev

    2010-12-01

    Full Text Available Introduction: Oncology patients need extensive follow-up and meticulous documentation. The aim of this study was to introduce a simple, platform independent file based system for documentation of diagnostic and therapeutic procedures in oncology patients and test its function.Material and methods: A file-name based system of the type M1M2M3.F2 was introduced, where M1 is a unique identifier for the patient, M2 is the date of the clinical intervention/event, M3 is an identifier for the author of the medical record and F2 is the specific software generated file-name extension.Results: This system is in use at 5 institutions, where a total of 11 persons on 14 different workstations inputted 16591 entries (files for 2370. The merge process was tested on 2 operating systems - when copied together all files sort up as expected by patient, and for each patient in a chronological order, providing a digital cumulative patient record, which contains heterogeneous file formats.Conclusion: The file based approach for storing heterogeneous digital patient related information is an reliable system, which can handle open-source, proprietary, general and custom file formats and seems to be easily scalable. Further development of software for automatic checks of the integrity and searching and indexing of the files is expected to produce a more user-friendly environment

  7. A Metadata-Rich File System

    Energy Technology Data Exchange (ETDEWEB)

    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.

  8. 基于虚拟文件系统的安全存储技术的研究%Secure Storage Technology Based on Virtual File System

    Institute of Scientific and Technical Information of China (English)

    崔奇

    2013-01-01

      介绍了一种基于虚拟文件系统的加密存储方法。通过文件系统开发技术设计并实现一个虚拟文件系统,该文件系统能够将一个二进制文件映射成虚拟磁盘,而且可以在虚拟磁盘上存取数据。为了保证虚拟磁盘中的文件的安全性,还在虚拟文件系统上集成了加密引擎、密钥管理和硬件绑定等模块。这种安全存储技术操作简单,并且能够提供高效实时的加密/解密措施,具有一定的实用价值。%This paper describes an encrypted storage method based on the virtual file system . We design and implement a virtual file system through the file system development technology .Virtual file system regards a binary file as virtual disk ,and can access the data on the virtual disk .In order to ensure the security of the file in virtual disk ,we integrate encryption engine ,key management and hardware binding modules into virtual file system .This security storage technology is easy to use ,and can provide efficient real -time encryption /decryption measures ,so it has practical value .

  9. Electronic Document Management Using Inverted Files System

    Science.gov (United States)

    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.

  10. Electronic Document Management Using Inverted Files System

    Directory of Open Access Journals (Sweden)

    Suhartono Derwin

    2014-03-01

    Full Text Available 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.

  11. SCR Algorithm: Saving/Restoring States of File Systems

    Institute of Scientific and Technical Information of China (English)

    魏晓辉; 鞠九滨

    2000-01-01

    Fault-tolerance is very important in cluster computing and has been implemented in many famous cluster-computing systems using checkpoint/restart mechanisms. But existent check-pointing algorithms cannot restore the states of a file system when roll-backing the running of a program, so there axe many restrictions on file accesses in existent fault-tolerance systems. SCR algorithm, an algorithm based on atomic operation and consistent schedule, which can restore the states of file systems, is presented in this paper. In the SCR algorithm, system calls on file systems are classified into idem-potent operations and non-idem-potent operations. A non-idem-potent operation modifies a file system's states, while an idem-potent operation does not. SCR algorithm tracks changes of the file system states. It logs each non-idem-potent operation used by user programs and the information that can restore the operation in disks. When check-pointing roll-backing the program, SCR algorithm will revert the file system states to the last checkpoint time. By using SCR algorithm, users are allowed to use any file operation in their programs.

  12. 基于PHP技术的网络文件管理系统设计%Design of network file management system based on PHP technology

    Institute of Scientific and Technical Information of China (English)

    张源伟; 杨铭; 郭昊

    2013-01-01

    To meet the demand of the development of network file management system, a network file management system based on PHP and MySQL technologies is designed in this paper to provide storage services like files upload and download, and management services such as file browsing, update, classification and sharing. It has friendly operating interface, high treatment efficiency and perfect security. It can provide a convenient and reliable way for users to conduct file online storage, management and sharing.%  针对当前网络文件管理系统发展的需要,以PHP和MySQL技术为重点,设计了一种基于PHP技术的网络文件管理系统,以提供文件上传、下载等存储服务和文件浏览、更新、分类、分享等管理服务。该系统操作界面友好,处理效率高,并具有良好的安全性设计,可为用户进行文件在线存储、管理以及用户之间的文件共享等提供方便可靠的途径。

  13. Implementation of a Test Data Generator based on DSL Files

    Directory of Open Access Journals (Sweden)

    Paul POCATILU

    2016-01-01

    Full Text Available In software testing process, test data generation represents an important step for high quality software, even for mobile devices. As proposed in previous works, a potential source for random data generation is represented by the UI layout files that are used for almost all mobile platforms (Android, iOS, Windows Phone/Mobile. This paper continues the previous work and presents a test data generation system based on Android layout files. The test data generator uses DSL files as input and generates test data that conform to several testing principles. The generated test data could be stored in XML files or any format required by the testing frameworks.

  14. Adding Data Management Services to Parallel File Systems

    Energy Technology Data Exchange (ETDEWEB)

    Brandt, Scott [Univ. of California, Santa Cruz, CA (United States)

    2015-03-04

    The objective of this project, called DAMASC for “Data Management in Scientific Computing”, is to coalesce data management with parallel file system management to present a declarative interface to scientists for managing, querying, and analyzing extremely large data sets efficiently and predictably. Managing extremely large data sets is a key challenge of exascale computing. The overhead, energy, and cost of moving massive volumes of data demand designs where computation is close to storage. In current architectures, compute/analysis clusters access data in a physically separate parallel file system and largely leave it scientist to reduce data movement. Over the past decades the high-end computing community has adopted middleware with multiple layers of abstractions and specialized file formats such as NetCDF-4 and HDF5. These abstractions provide a limited set of high-level data processing functions, but have inherent functionality and performance limitations: middleware that provides access to the highly structured contents of scientific data files stored in the (unstructured) file systems can only optimize to the extent that file system interfaces permit; the highly structured formats of these files often impedes native file system performance optimizations. We are developing Damasc, an enhanced high-performance file system with native rich data management services. Damasc will enable efficient queries and updates over files stored in their native byte-stream format while retaining the inherent performance of file system data storage via declarative queries and updates over views of underlying files. Damasc has four key benefits for the development of data-intensive scientific code: (1) applications can use important data-management services, such as declarative queries, views, and provenance tracking, that are currently available only within database systems; (2) the use of these services becomes easier, as they are provided within a familiar file-based

  15. Clockwise: a mixed-media file system

    NARCIS (Netherlands)

    Bosch, Peter; Jansen, Pierre G.; Mullender, Sape J.

    1999-01-01

    This paper presents Clockwise, a mixed-media file system. The primary goal of Clockwise is to provide a storage architecture that supports the storage and retrieval of best-effort and real-time file system data. Clockwise provides an abstraction called a dynamic partition that groups lists of relate

  16. Athos: Efficient Authentication of Outsourced File Systems

    DEFF Research Database (Denmark)

    Triandopoulos, Nikolaos; Goodrich, Michael T.; Papamanthou, Charalampos

    2008-01-01

    outsourced storage. Using light-weight cryptographic primitives and efficient data-structuring techniques, we design authentication schemes that allow a client to efficiently verify that the file system is fully consistent with the exact history of updates and queries requested by the client. In Athos, file-system......We study the problem of authenticated storage, where we wish to construct protocols that allow to outsource any complex file system to an untrusted server and yet ensure the file-system's integrity. We introduce Athos, a new, platform-independent and user-transparent architecture for authenticated...... operations are verified in time that is logarithmic in the size of the file system using optimal storage complexity-constant storage overhead at the client and asymptotically no extra overhead at the server. We provide a prototype implementation of Athos validating its performance and its authentication...

  17. Experiences on File Systems: Which is the best file system for you?

    CERN Document Server

    Blomer, J

    2015-01-01

    The distributed file system landscape is scattered. Besides a plethora of research file systems, there is also a large number of production grade file systems with various strengths and weaknesses. The file system, as an abstraction of permanent storage, is appealing because it provides application portability and integration with legacy and third-party applications, including UNIX utilities. On the other hand, the general and simple file system interface makes it notoriously difficult for a distributed file system to perform well under a variety of different workloads. This contribution provides a taxonomy of commonly used distributed file systems and points out areas of research and development that are particularly important for high-energy physics.

  18. Design and Implementation of Ceph: A Scalable Distributed File System

    Energy Technology Data Exchange (ETDEWEB)

    Weil, S A; Brandt, S A; Miller, E L; Long, D E; Maltzahn, C

    2006-04-19

    File system designers continue to look to new architectures to improve scalability. Object-based storage diverges from server-based (e.g. NFS) and SAN-based storage systems by coupling processors and memory with disk drives, delegating low-level allocation to object storage devices (OSDs) and decoupling I/O (read/write) from metadata (file open/close) operations. Even recent object-based systems inherit decades-old architectural choices going back to early UNIX file systems, however, limiting their ability to effectively scale to hundreds of petabytes. We present Ceph, a distributed file system that provides excellent performance and reliability with unprecedented scalability. Ceph maximizes the separation between data and metadata management by replacing allocation tables with a pseudo-random data distribution function (CRUSH) designed for heterogeneous and dynamic clusters of unreliable OSDs. We leverage OSD intelligence to distribute data replication, failure detection and recovery with semi-autonomous OSDs running a specialized local object storage file system (EBOFS). Finally, Ceph is built around a dynamic distributed metadata management cluster that provides extremely efficient metadata management that seamlessly adapts to a wide range of general purpose and scientific computing file system workloads. We present performance measurements under a variety of workloads that show superior I/O performance and scalable metadata management (more than a quarter million metadata ops/sec).

  19. Modeling and simulation of a high-performance PACS based on a shared file system architecture

    Science.gov (United States)

    Meredith, Glenn; Anderson, Kenneth R.; Wirsz, Emil; Prior, Fred W.; Wilson, Dennis L.

    1992-07-01

    Siemens and Loral Western Development Labs have designed a Picture Archiving and Communication System capable of supporting a large, fully digital hospital. Its functions include the management, storage and retrieval of medical images. The system may be modeled as a heterogeneous network of processing elements, transfer devices and storage units. Several discrete event simulation models have been designed to investigate different levels of the design. These models include the System Model, focusing on the flow of image traffic throughout the system, the Workstation Models, focusing on the internal processing in the different types of workstations, and the Communication Network Model, focusing on the control communication and host computer processing. The first two of these models are addressed here, with reference being made to a separate paper regarding the Communication Network Model. This paper describes some of the issues addressed with the models, the modeling techniques used and the performance results from the simulations. Important parameters of interest include: time to retrieve images from different possible storage locations and the utilization levels of the transfer devices and other key hardware components. To understand system performance under fully loaded conditions, the proposed system for the Madigan Army Medical Center was modeled in detail, as part of the Medical Diagnostic Imaging Support System (MDIS) proposal.

  20. File Security Protection System Based on Minifilter%一种基于Minifilter的文件安全保护系统

    Institute of Scientific and Technical Information of China (English)

    戈洋洋; 毛宇光

    2013-01-01

    针对操作系统中数据文件可能出现的文件泄露等安全性问题,在研究了访问控制领域经典的BLP和Biba模型的基础上,提出了一种可同时维护数据文件保密性和完整性的新强制访问控制模型.同时,结合Minifilter文件系统过滤驱动程序开发并实现一种文件安全保护系统,对核心逻辑和关键模块进行了详细介绍.该系统能根据既定策略有效地保护系统的文件安全,为数据保护提供了一种新的解决方案.%Aiming at ensuring file security, a new mandatory access control model is presented, which is based on the BLP model and Biba model. In accordance with the Minifilter, a file security protection system has been implemented, and the components and key technologies of it are given in detail. This file security protection system provides effective protection for file according to special strategy, thus offering a new scheme for data protection.

  1. Exploring proximity based peer clustering in BitTorrent-like Peer-to-Peer file sharing systems

    Institute of Scientific and Technical Information of China (English)

    Yu Jiadi; Li Minglu

    2008-01-01

    A hierarchical clustered BitTorrent (CBT) system is proposed to improve the file sharing performance of the BitTorrent system, in which peers are grouped into clusters in a large-scale BitTorrent-like underlying overlay network in such a way that clusters are evenly distributed and that the peers within the cluster are relatively close to each other. A fluid model is developed to compare the performance of the proposed CBT system with the BitTorrent system, and the result shows that the CBT system can effectively improve the performance of the system. Simulation results also demonstrate that the CBT system improves the system scalability and efficiency while retaining the robustness and incentives of the original BitTorrent paradigm.

  2. Protecting your files on the AFS file system

    CERN Multimedia

    2011-01-01

    The Andrew File System is a world-wide distributed file system linking hundreds of universities and organizations, including CERN. Files can be accessed from anywhere, via dedicated AFS client programs or via web interfaces that export the file contents on the web. Due to the ease of access to AFS it is of utmost importance to properly protect access to sensitive data in AFS. As the use of AFS access control mechanisms is not obvious to all users, passwords, private SSH keys or certificates have been exposed in the past. In one specific instance, this also led to bad publicity due to a journalist accessing supposedly "private" AFS folders (SonntagsZeitung 2009/11/08). This problem does not only affect the individual user but also has a bad impact on CERN's reputation when it comes to IT security. Therefore, all departments and LHC experiments agreed in April 2010 to apply more stringent folder protections to all AFS user folders. The goal of this data protection policy is to assist users in...

  3. Protecting your files on the DFS file system

    CERN Multimedia

    Computer Security Team

    2011-01-01

    The Windows Distributed File System (DFS) hosts user directories for all NICE users plus many more data.    Files can be accessed from anywhere, via a dedicated web portal (http://cern.ch/dfs). Due to the ease of access to DFS with in CERN it is of utmost importance to properly protect access to sensitive data. As the use of DFS access control mechanisms is not obvious to all users, passwords, certificates or sensitive files might get exposed. At least this happened in past to the Andrews File System (AFS) - the Linux equivalent to DFS) - and led to bad publicity due to a journalist accessing supposedly "private" AFS folders (SonntagsZeitung 2009/11/08). This problem does not only affect the individual user but also has a bad impact on CERN's reputation when it comes to IT security. Therefore, all departments and LHC experiments agreed recently to apply more stringent protections to all DFS user folders. The goal of this data protection policy is to assist users in pro...

  4. Dynamic Non-Hierarchical File Systems for Exascale Storage

    Energy Technology Data Exchange (ETDEWEB)

    Long, Darrell E. [PI; Miller, Ethan L [Co PI

    2015-02-24

    This constitutes the final report for “Dynamic Non-Hierarchical File Systems for Exascale Storage”. The ultimate goal of this project was to improve data management in scientific computing and high-end computing (HEC) applications, and to achieve this goal we proposed: to develop the first, HEC-targeted, file system featuring rich metadata and provenance collection, extreme scalability, and future storage hardware integration as core design goals, and to evaluate and develop a flexible non-hierarchical file system interface suitable for providing more powerful and intuitive data management interfaces to HEC and scientific computing users. Data management is swiftly becoming a serious problem in the scientific community – while copious amounts of data are good for obtaining results, finding the right data is often daunting and sometimes impossible. Scientists participating in a Department of Energy workshop noted that most of their time was spent “...finding, processing, organizing, and moving data and it’s going to get much worse”. Scientists should not be forced to become data mining experts in order to retrieve the data they want, nor should they be expected to remember the naming convention they used several years ago for a set of experiments they now wish to revisit. Ideally, locating the data you need would be as easy as browsing the web. Unfortunately, existing data management approaches are usually based on hierarchical naming, a 40 year-old technology designed to manage thousands of files, not exabytes of data. Today’s systems do not take advantage of the rich array of metadata that current high-end computing (HEC) file systems can gather, including content-based metadata and provenance1 information. As a result, current metadata search approaches are typically ad hoc and often work by providing a parallel management system to the “main” file system, as is done in Linux (the locate utility), personal computers, and enterprise search

  5. Small file aggregation in a parallel computing system

    Science.gov (United States)

    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.

  6. Efficient load rebalancing for distributed file system in Clouds

    Directory of Open Access Journals (Sweden)

    Mr. Mohan S. Deshmukh

    2016-05-01

    Full Text Available Cloud computing is an upcoming era in software industry. It’s a very vast and developing technology. Distributed file systems play an important role in cloud computing applications based on map reduce techniques. While making use of distributed file systems for cloud computing, nodes serves computing and storage functions at the same time. Given file is divided into small parts to use map reduce algorithms in parallel. But the problem lies here since in cloud computing nodes may be added, deleted or modified any time and also operations on files may be done dynamically. This causes the unequal load distribution of load among the nodes which leads to load imbalance problem in distributed file system. Newly developed distributed file system mostly depends upon central node for load distribution but this method is not helpful in large-scale and where chances of failure are more. Use of central node for load distribution creates a problem of single point dependency and chances of performance of bottleneck are more. As well as issues like movement cost and network traffic caused due to migration of nodes and file chunks need to be resolved. So we are proposing algorithm which will overcome all these problems and helps to achieve uniform load distribution efficiently. To verify the feasibility and efficiency of our algorithm we will be using simulation setup and compare our algorithm with existing techniques for the factors like load imbalance factor, movement cost and network traffic.

  7. NCPC Central Files Information System (CFIS)

    Data.gov (United States)

    National Capital Planning Commission — This dataset contains records from NCPC's Central Files Information System (CFIS), which is a comprehensive database of projects submitted to NCPC for design review...

  8. Methods and apparatus for multi-resolution replication of files in a parallel computing system using semantic information

    Energy Technology Data Exchange (ETDEWEB)

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

    2015-10-20

    Techniques are provided for storing files in a parallel computing system using different resolutions. A method is provided for storing at least one file generated by a distributed application in a parallel computing system. The file comprises one or more of a complete file and a sub-file. The method comprises the steps of obtaining semantic information related to the file; generating a plurality of replicas of the file with different resolutions based on the semantic information; and storing the file and the plurality of replicas of the file in one or more storage nodes of the parallel computing system. The different resolutions comprise, for example, a variable number of bits and/or a different sub-set of data elements from the file. A plurality of the sub-files can be merged to reproduce the file.

  9. 基于位图示法的NSFS文件系统设计%Design of NSFS file system based on bitmap method

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    The file system is the core function element for data storage of an operating system. It is applied to data storage and data management. Any operating system without file system can only calculate data,but the calculated results can not re⁃side in random access memory,and all the data and information will be lost after computer power off. Actually file system is a necessary functional component of a modern operating system. As information technology is improving rapidly nowadays,the file system in the embedded operating system has been more and more important in various fields. In aviation industry,the embed⁃ded operating system must provide a convenient file system which should be easy to use and provide high performance. NSFS is a file system with high availability based on bitmap method. It is designed as a concise architecture. Moreover,the cluster size can be allocated based on the file size adaptively with minimal wasted storage space. In summary,NSFS is good at performance with high flexibility and reliability.%  文件系统是操作系统进行数据存储的核心功能组件,它具有数据的存储和数据的管理功能。失去了文件系统的操作系统只能进行数据计算处理,而不能存储计算结果,所有重要的数据和信息在计算机断电的时候都会消失。可以说文件系统是现代操作系统不可分割的基本功能组件。在信息化高速发展的今天,嵌入式操作系统技术中的文件系统有着越来越重要的地位,航空领域的嵌入式操作系统必须提供一个方便易用高性能高可靠的文件系统。NSFS文件系统是基于位图示法设计的具有高可用性的文件系统。它的结构简洁,可以根据文件大小自适应地分配簇大小,空间浪费极小,具有良好的性能和很大的灵活性,并且具备较高的可靠性。

  10. System for Multicast File Transfer

    Directory of Open Access Journals (Sweden)

    Dorin Custura

    2012-03-01

    Full Text Available The distribution of big files over the network from a single source to a large number of recipients is not efficient by using standard client-server or even peer-to peer file transfer protocols.  Thus, the transfer of a hierarchy of big files to multiple destinations can be optimized in terms of bandwidth usage and data storage reads by using multicast networking. In order to achieve that, a simple application layer protocol can be imagined. It uses multicast UDP as transport and it provides a mechanism for data ordering and retransmission. Some security problems are also considered in this protocol, because at this time the Internet standards supporting multicast security are still in the development stage.

  11. 基于Android的多功能文件管理系统的设计与实现%Design and Implementation of Android Based Versatile File Management System

    Institute of Scientific and Technical Information of China (English)

    谭忠兵; 苏斯灿

    2012-01-01

    The system involved in this paper is an Android based versatile file management system. The aim is to develop an easily used management system based on Android platform, and the main functions of the system are browsing file, revising file authority, adding file to file library, browsing file history, file compression and encryption, etc.%文章所涉内容是一款基于Android的多功能文件管理系统的设计与实现。该设计以Android系统为开发平台,其目的是开发出一种方便用户使用的管理软件,使其具有文件浏览、文件权限的修改、添加文件到文件库、文件历史记录浏览、文件压缩以及文件加密等功能。

  12. Tuning HDF5 for Lustre File Systems

    Energy Technology Data Exchange (ETDEWEB)

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

    2010-09-24

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

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

    Science.gov (United States)

    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.

  14. Linux-based File System Supporting the Continuous Media%基于Linux的文件系统对连续媒体的支持

    Institute of Scientific and Technical Information of China (English)

    王光彩; 黄清华; 顾君忠

    2001-01-01

    For techniques on compress and network and multimedia are developed rapidly, audio & video media become popular. However present operating systems can support the continuous media only on the layer of applications, not in the layer of foundation. In this paper, considerating on the operating system, we discuss how to support the continuous media on the base layer. Then we depict clearly the design and implementation of BLOB ( Binary Large Object) file system which is based on Lin ux.%从操作系统角度考虑了底层文件系统对连续媒体的支持,并详细介绍了在Linux下设计和实现的BLOB(Binary Large Object)文件系统的设计思想及其实现技术细节,并讨论它对连续媒体的支持情况.

  15. NVRAM as Main Storage of Parallel File System

    Directory of Open Access Journals (Sweden)

    MALINOWSKI Artur

    2016-05-01

    Full Text Available Modern cluster environments' main trouble used to be lack of computational power provided by CPUs and GPUs, but recently they suffer more and more from insufficient performance of input and output operations. Apart from better network infrastructure and more sophisticated processing algorithms, a lot of solutions base on emerging memory technologies. This paper presents evaluation of using non-volatile random-access memory as a main storage of Parallel File System. The author justifies feasibility of such configuration and evaluates it with MPI I/O, OrangeFS as a file system, two popular cluster I/O benchmarks and software memory simulation. Obtained results suggest, that with Parallel File System highly optimized for block devices, small differences in access time and memory bandwidth does not influence system performance.

  16. Design of Files Management System Interface Platform Based on Middleware%基于中间件的档案管理系统接口平台设计

    Institute of Scientific and Technical Information of China (English)

    张伟娜

    2011-01-01

    Files management system is used for collecting files in government units and then organizes them to catalog. The interface platform is used to ensure that the file management subsystem and the file management system to communicate directly. Hie use of middleware can be effectively distributed to design and implement the file management system interface. The paper researches the file management system interface based on the middleware, focuses on analyzing the specific application of middleware technology in files management system interface, and designs the interface platform and security to ensure seamless connection between systems. It can realize the system data exchange and optimizes the development of files management system by using middleware to design interface middleware.%档案管理系统用于收集各政府单位中的档案数据,并将其整理编目.其中,接口平台保证各档案管理子系统与档案管理系统之间的直接通信,采用中间件可以有效地对分布式的档案管理系统接口进行设计和实现.本文对基于中间件的档案管理系统接口进行研究,重点分析中间件技术在档案管理系统接口中的具体应用,并对接口平台及安全性进行设计,以保证系统间的无缝连接.本文将中间件应用于接口设计,实现了系统数据互通,优化了档案管理系统开发.

  17. 基于嵌入式Linux的无线文件传输系统的实现%Implementation of wireless file transaction system based on embedded Linux

    Institute of Scientific and Technical Information of China (English)

    李铁男

    2011-01-01

    The terminal of wireless file transaction system is discussed and a general scheme of system is presented, and the wireless file transaction terminal is developed by wireless communication technology and computer technology. The terminal hardware is designed byembedded processor, wireless module. The plafform of embedded Linux OS is built, and PPP protocol is ported. The application program is developed by multi-threads including CDMA wireless communication software using PPP and TCP protocol. The terminal is debugged and tested. The system is optimized based on the presented wireless transaction modules according to the character of the wireless network to promote the speed to four times and realize the function o f wireless file transaction.%对无线文件传输系统进行了设计,采用无线通信技术,计算机技术研制了无线文件发送终端,采用嵌入式微处理器、无线通信模块等电路设计了无线文件发送终端的硬件,构建了嵌入式Linux操作系统平台,移植了PPP协议,采用多进程开发了应用程序,应用TCP/IP协议和PPP协议设计了CDMA无线通信软件,并进行了调试和实验运行.在原有无线传输模块的基础上进行研发,根据无线网络特性进行系统优化,将无线传输速度提升到原来的4倍,实现了文件无线发送的功能.

  18. 基于Dynaform的回弹补偿算法与系统%The Compensation Algorithm and System for Springback in Sheet Metal Forming Based on Dynain File

    Institute of Scientific and Technical Information of China (English)

    胡志超; 李延平; 常勇; 王沁峰; 李毅

    2012-01-01

    By analyzing the format of Dynain file, an algorithm was developed for compensating springback in sheet metal forming based on theories of linear control system, Fourier transform, transfer function and the Dynain file from the forming and springback numerical simulated result of Dynaform. In terms of this algorithm, the springbackcom system was designed by calling functions from OpenGL graphic library and Matlab Matrix operation tools through Visual C ++6.0. The developed system was conducive for spring back error analysis and springback compensation.%以线性控制系统、傅里叶变换及传递函数为基本理论,在分析Dynain文件格式基础上,提出了一种基于Dynaform软件冲压回弹结果Dynain文件的回弹补偿算法.基于该算法,以Visual C++6.0为平台、以Matlab为矩阵运算工具、以OpenGL为图形开发工具,开发了基于Dynain文件的回弹补偿系统springbackcom.该系统为回弹误差分析及回弹补偿提供了有力的支持.

  19. Efficient Search in P2P File Sharing System

    Institute of Scientific and Technical Information of China (English)

    Xiao Bo; Jin Wei; Hou Mengshu

    2006-01-01

    A new routing algorithm of peer-to-peer file sharing system with routing indices was proposed, in which a node forwards a query to neighbors that are more likely to have answers based on its statistics. The proposed algorithm was tested by creating a P2P simulator and varying the input parameters, and was compared to the search algorithms using flooding (FLD) and random walk (RW). The result shows that with the proposed design, the queries are routed effectively, the network flows are reduced remarkably, and the peer-to-peer file sharing system gains a good expansibility.

  20. JavaFIRE: A Replica and File System for Grids

    Science.gov (United States)

    Petek, Marko; da Silva Gomes, Diego; Resin Geyer, Claudio Fernando; Santoro, Alberto; Gowdy, Stephen

    2012-12-01

    The work is focused on the creation of a replica and file transfers system for Computational Grids inspired on the needs of the High Energy Physics (HEP). Due to the high volume of data created by the HEP experiments, an efficient file and dataset replica system may play an important role on the computing model. Data replica systems allow the creation of copies, distributed between the different storage elements on the Grid. In the HEP context, the data files are basically immutable. This eases the task of the replica system, because given sufficient local storage resources any dataset just needs to be replicated to a particular site once. Concurrent with the advent of computational Grids, another important theme in the distributed systems area that has also seen some significant interest is that of peer-to-peer networks (p2p). P2p networks are an important and evolving mechanism that eases the use of distributed computing and storage resources by end users. One common technique to achieve faster file download from possibly overloaded storage elements over congested networks is to split the files into smaller pieces. This way, each piece can be transferred from a different replica, in parallel or not, optimizing the moments when the network conditions are better suited to the transfer. The main tasks achieved by the system are: the creation of replicas, the development of a system for replicas transfer (RFT) and for replicas location (RLS) with a different architecture that the one provided by Globus and the development of a system for file transfer in pieces on computational grids with interfaces for several storage elements. The RLS uses a p2p overlay based on the Kademlia algorithm.

  1. Public Document Room file classification system

    Energy Technology Data Exchange (ETDEWEB)

    1982-06-01

    This listing contains detailed descriptions of the file classification system for documents available from the Public Document Room (PDR) of the US Nuclear Regulatory Commission. As a public service branch of the agency, the PDR maintains facilities for receiving, processing, storing, and retrieving documents which NRC generates or receives in performing its regulatory function. Unlike a library, the PDR does not maintain collections of formally published materials, such as books, monographs, serials, periodicals, or general indexes. The documents on file at the PDR can be reports, written records of meetings (transcripts), existing or proposed regulations, the text of licenses or their amendments, and correspondence.

  2. 76 FR 70651 - Fee for Filing a Patent Application Other Than by the Electronic Filing System

    Science.gov (United States)

    2011-11-15

    .... Information concerning electronic filing via EFS-Web is available from the USPTO's Patent Electronic Business... the Electronic Filing System AGENCY: United States Patent and Trademark Office, Commerce. ACTION... for a design, plant, or provisional application, that is not filed by electronic means as...

  3. Enabling Large-Scale Storage in Sensor Networks with the Coffee File System

    OpenAIRE

    Tsiftes, Nicolas; Dunkels, Adam; He, Zhitao; Voigt, Thiemo

    2009-01-01

    Persistent storage offers multiple advantages for sensor networks, yet the available storage systems have been unwieldy because of their complexity and device-specific designs. We present the Coffee file system for flash-based sensor devices. Coffee provides a programming interface for building efficient and portable storage abstractions. Unlike previous flash file systems, Coffee uses a small and constant RAM footprint per file, making it scale elegantly with workloads consisting of large fi...

  4. PCT Reforms Its Patent Filing System

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    As of January 1,2004,the first critical steps in seekingpatent protection in multiple countries will be easier as aresult of reforms to the international patent filing system.Aseries of reforms to the World Intellectual PropertyOrganisation's(WIPO)Patent Cooperation Treaty(PCT),ranging from a new simplified system of designatingcountries in which patent protection is sought to an enhancedsearch and preliminary examination system,will simplify thecomplex procedure of obtaining patent protection in severa...

  5. File Assignment Policy in Network Storage System

    Institute of Scientific and Technical Information of China (English)

    CaoQiang; XieChang-sheng

    2003-01-01

    Network storage increase capacity and scalability of storage system, data availability and enables the sharing of data among clients. When the developing network technology reduce performance gap between disk and network, however,mismatched policies and access pattern can significantly reduce network storage performance. So the strategy of data place ment in system is an important factor that impacts the performance of overall system. In this paper, the two algorithms of file assignment are presented. One is Greed partition that aims at the load balance across all NADs (Network Attached Disk). The other is Sort partition that tries to minimize variance of service time in each NAD. Moreover, we also compare the performance of our two algorithms in practical environment. Our experimental results show that when the size distribution (load characters) of all assigning files is closer and larger, Sort partition provides consistently better response times than Greedy algorithm. However, when the range of all assigning files is wider, there are more small files and access rate is higher, the Greedy algorithm has superior performance in compared with the Sort partition in off-line.

  6. File Assignment Policy in Network Storage System

    Institute of Scientific and Technical Information of China (English)

    Cao Qiang; Xie Chang-sheng

    2003-01-01

    Network storage increase capacity and scalability of storage system, data availability and enables the sharing of data among clients. When the developing network technology reduce performance gap between disk and network, however, mismatched policies and access pattern can significantly reduce network storage performance. So the strategy of data placement in system is an important factor that impacts the performance of overall system. In this paper, the two algorithms of file assignment are presented. One is Greed partition that aims at the load balance across all NADs (Network Attached Disk). The other is Sort partition that tries to minimize variance of service time in each NAD. Moreover, we also compare the performance of our two algorithms in practical environment. Our experimental results show that when the size distribution (load characters) of all assigning files is closer and larger, Sort partition provides consistently better response times than Greedy algorithm. However, when the range of all assigning files is wider, there are more small files and access rate is higher, the Greedy algorithm has superior performance in compared with the Sort partition in off-line.

  7. Distributed Data Management and Distributed File Systems

    CERN Document Server

    Girone, Maria

    2015-01-01

    The LHC program has been successful in part due to the globally distributed computing resources used for collecting, serving, processing, and analyzing the large LHC datasets. The introduction of distributed computing early in the LHC program spawned the development of new technologies and techniques to synchronize information and data between physically separated computing centers. Two of the most challenges services are the distributed file systems and the distributed data management systems. In this paper I will discuss how we have evolved from local site services to more globally independent services in the areas of distributed file systems and data management and how these capabilities may continue to evolve into the future. I will address the design choices, the motivations, and the future evolution of the computing systems used for High Energy Physics.

  8. Design and implementation of backstage management system of file backup system based on MVC architecture%基于MVC的文件备份后台管理系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    边霞; 赵奎; 胡晓勤; 赵辉

    2011-01-01

    To improve the efficiency of the file backup system and provide a comprehensive management to the remote backup center, a backstage management system of file backup system based on MVC (model-view-controller) architecture is proposed. On the basis of describing the architecture of the file backup system and studying the MVC design method and the principles of Joomla framework, the backstage management system of file backup system is designed and implemented based on Joomla framework and LAMP platform, and the system' s efficiency, a clear structure, a good scalability, maintainability and reusability are ensured.%为了提高文件备份系统的效率,并为文件备份系统的远程备份中心提供全面的管理功能,提出了基于MVC (modelview-controller)设计模式的文件备份后台管理系统.介绍了文件备份系统的架构,研究了MVC的设计思想以及Joomla框架的原理,在此基础上,将基于MVC设计模式的Joomla框架引入到文件备份后台管理系统的开发中,并基于LAMP平台设计与实现了文件备份后台管理系统,确保了系统的高效,结构清晰以及良好的可扩展性、可维护性与可重用性.

  9. Heuristic file sorted assignment algorithm of parallel I/O on cluster computing system

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhi-gang; ZENG Bi-qing; XIONG Ce; DENG Xiao-heng; ZENG Zhi-wen; LIU An-feng

    2005-01-01

    A new file assignment strategy of parallel I/O, which is named heuristic file sorted assignment algorithm was proposed on cluster computing system. Based on the load balancing, it assigns the files to the same disk according to the similar service time. Firstly, the files were sorted and stored at the set I in descending order in terms of their service time, then one disk of cluster node was selected randomly when the files were to be assigned, and at last the continuous files were taken orderly from the set I to the disk until the disk reached its load maximum. The experimental results show that the new strategy improves the performance by 20.2% when the load of the system is light and by 31.6% when the load is heavy. And the higher the data access rate, the more evident the improvement of the performance obtained by the heuristic file sorted assignment algorithm.

  10. The transformation and access of image database based on the file system traversal%基于文件遍历的图像数据库转换及访问

    Institute of Scientific and Technical Information of China (English)

    祝元仲

    2016-01-01

    Image in the database has two storage mode which based on the file system or the database system. This article uses file traversal method to achieve the image storage mode conversion from the database system to the file system in the ASP development environment, by using the two objects, ADODB.Stream and Scripting.FileSystemObject. It also realizes the rapid release of mass images, and achieves good results.%图像在数据库中的存储有文件系统方式和数据库系统方式两种模式,本文以ASP为平台,利用文件遍历,通过两个对象ADODB.Stream、Scripting.FileSystemObject实现了图像文件存储从数据库系统方式转换为文件系统方式,以及海量图片的快速发布,取得了较好的使用效果。

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

    Science.gov (United States)

    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.

  12. A History of the Andrew File System

    CERN Document Server

    CERN. Geneva; Altman, Jeffrey

    2011-01-01

    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.

  13. 基于VMM的文件完整性监控系统的设计与实现%Design and Implementation of VMM-based File Integrity Monitoring System

    Institute of Scientific and Technical Information of China (English)

    陈威; 王晖

    2012-01-01

    A virtual machine monitor(VMM) has strong control ability and its characteristic of isolation, and can solve open question in the existing file integrity monitoring systems, A new VMM-based method for file integrity protecting system was proposed, which is isolated between the system and the guest systems. This method should pre-configure the files to be protected and can avoid the attack to these files from the malicious codes. In this scheme of file integrity protection, the system can intercept all the access attempts to the protected files in real-time by designing and implanting the "detector" and "reversed file locator" into the isolated layer of the virtual machine, and achieves the strategy of pre-protection.%虚拟机监控器(VMM)具有强控制性、隔离性的特点.针对现有文件完整性监控系统中存在的缺陷,提出了一种新的基于VMM且与客户机相隔离的文件完整性保护方法,该方法能够保护用户的敏感文件,特别是文件完整性监控系统本身,使其免受恶意代码的攻击.这种基于虚拟机监控器的文件完整性保护解决方案,在虚拟机隔离层中通过设计和嵌入的“探测器”和“文件逆向定位器”两种关键技术,能够实时地探测到对被保护文件的所有访问企图,从而实现预置的保护策略.

  14. Implementation of SD-Card File System Based on FPGA and Nios II Soft Core%FPGA和NiosⅡ软核的SD卡文件系统实现方法

    Institute of Scientific and Technical Information of China (English)

    武景涛; 史大光; 高龙; 陈闪

    2012-01-01

    The method uses Cyclone II series FPGA to build a SPI controller for SD card, and it achieves an embedded file system based on Nios II soft core processor. The file system is achieved by transplanting znFAT32 file system to Nios II EDS platform.%利用CycloneⅡ系列FPGA构建了一种用于SD卡读写的SPI控制器,并在其上实现了一个基于NiosⅡ软核处理器的嵌入式文件系统。此文件系统是通过在NiosIIEDS开发平台上移植znFAT32文件系统实现的。

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  16. 基于Hadoop分布式文件系统的单点问题的研究%Research on Problems of Single Point Based on Hadoop Distributed File System

    Institute of Scientific and Technical Information of China (English)

    宋继红; 李梦楠; 郝得智

    2014-01-01

    Starting from the architecture of the Hadoop distributed file system,the problems of single point existed in the NameNode are analyzed and studied in this paper.Based on this,a small file merging algorithm is proposed for the single point memory bottlenecks.This algorithm,with Hadoop as the foundation and by the features of Hadoop distributed file system,serializes the generated large file to the Hadoop distributed file system,solves the problem of the single point memory bottlenecks,and improves the performance and reliability of the system.%从Hadoop分布式文件系统的架构出发,对NameNode节点存在的单点问题进行了分析与研究。在这个前提下,针对单点内存瓶颈问题,提出了一个小文件归并算法。此算法以Hadoop为基础,利用Hadoop分布式文件系统的特点,将归并后生成的大文件序列化到Hadoop分布式文件系统,很好地解决了小文件过多时NameNode单点内存瓶颈问题,并提高了系统的性能和可靠性。

  17. Benefits of an image-oriented parallel file system

    Science.gov (United States)

    Hersch, Roger D.

    1993-04-01

    Professionals in various fields such as medical imaging, biology, and civil engineering require rapid access to huge amounts of uncompressed pixmap image data. In order to fulfill these requirements, a parallel image server architecture is proposed, based on arrays of intelligent disk nodes, each disk node being composed of one processor and one disk. Pixmap image data is partitioned into rectangular extents, whose size and distribution among disk nodes minimize overall image access times. Disk node processors are responsible for maintaining both the data structure associated with their image file extents and an extent cache offering fast access to recently used data. Disk node processors may also be used for applying image processing operations to locally retrieved image parts. This contribution introduces the concept of an image oriented file system, where the file system is aware of image size, extent size, and extent distribution. Such an image oriented file system provides a natural way of combining parallel disk accesses and processing operations. The performance of the proposed multiprocessor-multidisk architecture is bounded either by communication throughput or by disk access speed. However, when disk accesses are combined with low-level local processing operations such as image size reduction (zooming), close to linear speedup factors can be obtained by increasing the number of intelligent disk nodes.

  18. Automated quality control in a file-based broadcasting workflow

    Science.gov (United States)

    Zhang, Lina

    2014-04-01

    Benefit from the development of information and internet technologies, television broadcasting is transforming from inefficient tape-based production and distribution to integrated file-based workflows. However, no matter how many changes have took place, successful broadcasting still depends on the ability to deliver a consistent high quality signal to the audiences. After the transition from tape to file, traditional methods of manual quality control (QC) become inadequate, subjective, and inefficient. Based on China Central Television's full file-based workflow in the new site, this paper introduces an automated quality control test system for accurate detection of hidden troubles in media contents. It discusses the system framework and workflow control when the automated QC is added. It puts forward a QC criterion and brings forth a QC software followed this criterion. It also does some experiments on QC speed by adopting parallel processing and distributed computing. The performance of the test system shows that the adoption of automated QC can make the production effective and efficient, and help the station to achieve a competitive advantage in the media market.

  19. 基于哈希规则的分布式文件系统的设计与实现%Design and Implementation of Distributed File System Based on the Hash Rule

    Institute of Scientific and Technical Information of China (English)

    段翰聪; 梅玫; 李林

    2013-01-01

    随着全球数据量猛增,分布式文件系统逐渐成为存储技术的研究重点.文章设计与实现了基于哈希规则的分布式文件系统,它是一个可扩展的集群文件系统,并提供了一个具有两层结构哈希规则,规则为客户端提供了文件定位服务,其伪随机性也将文件均匀的分布到了不同的服务器中,起到了一定的负载均衡的作用;系统中采用桶来管理文件元数据与文件数据,桶的独立性与灵活性使得桶便于迁移,增加了系统的可扩展性;系统中同时采用了Lazy机制来达成系统性能与文件副本可用性之间的平衡.文中首先介绍了系统的整体架构,然后描述了系统中采用的关键技术与系统典型流程,最后,对系统的性能进行的测试证明了其高效性.%With the increase of the amount of data around the whole world,distributed file system gradually becomes the key point of the storage technology research.The paper designed and implemented the distributed file system based on the hash rule.It is a extendible cluster file system,which provides a two-level structure hash-rule.The rule offers file location service for clients,and its pseudorandom feature makes file uniformly distributed on different servers.Thus the hash-rule plays a certain part in load balancing.Bucket is an entity that the file system uses to manage file data and metadata.The independence and the flexibility makes bucket easily to migrate,which increases the system scalability from another point of view.The system also uses the Lazy mechanism to achieve the balance between the performance and the duplication availability.We introduced the system architecture first.Then we described the key technique and the representative process of the system.The performance test of the file system in the last part proves its effectiveness.

  20. NVRAM as Main Storage of Parallel File System

    OpenAIRE

    MALINOWSKI Artur

    2016-01-01

    Modern cluster environments' main trouble used to be lack of computational power provided by CPUs and GPUs, but recently they suffer more and more from insufficient performance of input and output operations. Apart from better network infrastructure and more sophisticated processing algorithms, a lot of solutions base on emerging memory technologies. This paper presents evaluation of using non-volatile random-access memory as a main storage of Parallel File System. The author justifies fea...

  1. 基于FAT32文件系统的数据恢复技术%Data Recovery Technology Based on the FAT32 File System

    Institute of Scientific and Technical Information of China (English)

    张明旺

    2012-01-01

    This paper presents the data recovery methods in the FAT32 file system in case of hard disk data loss due to accidental misuse.A detailed description is given of the structure of the FAT32 file system and file storage features with emphasis on the principles of the FAT32 file system data recovery.The specific methods and processes of data recovery are described in detail.%针对用户在FAT32文件系统下由于误操作,造成硬盘上数据被误删除等数据丢失的情况,提出如何恢复数据的方法。通过对FAT32文件系统的结构,文件的存储特点等方面的介绍,重点分析了FAT32文件系统下数据恢复的原理,并在此基础上对数据恢复的具体方法和过程进行了阐述。

  2. Benchmarking File System Benchmarking: It *IS* Rocket Science

    OpenAIRE

    Seltzer, Margo I.; Tarasov, Vasily; Bhanage, Saumitra; Zadok, Erez

    2011-01-01

    The quality of file system benchmarking has not improved in over a decade of intense research spanning hundreds of publications. Researchers repeatedly use a wide range of poorly designed benchmarks, and in most cases, develop their own ad-hoc benchmarks. Our community lacks a definition of what we want to benchmark in a file system. We propose several dimensions of file system benchmarking and review the wide range of tools and techniques in widespread use. We experimentally show that even t...

  3. The Design of Network File Download System Based on .NET%基于.NET的网络文件下载系统的设计

    Institute of Scientific and Technical Information of China (English)

    韩晓菊

    2013-01-01

    The network file download system is information data storage space, with the system the users can login the website to upload、download and share the information. The design discusses how to create the system administrator interface and user interface of network file download system in detail.%网络文件下载系统,是一种用户可以通过互联网登录网站进行数据上传、下载、共享等操作的信息数据存储空间。本次设计详细论述了如何使用ASP.NET来创建网络文件下载系统管理员界面与用户界面。

  4. On the File Management System Based on Radio Fre-quency Identification (RFID)%论基于RFID的智能文件管理系统

    Institute of Scientific and Technical Information of China (English)

    崔霄翔

    2014-01-01

    The paperless office is vigorously advocated currently, but paper files still prevail and convey a considerable amount of sensitive and even confidential information. Using the remote de-tection of Radio Frequency Identification(RFID)technology, re-ferring to the perfect book management system, this system adopts the method of file monitoring and security alert, thus safely realizing the circulation management and safety management of paper confidential files, reducing the incidence rate of secret di-vulgence, and improving the efficiency of paper confidential files management.%虽然现在大力提倡无纸化办公,但是纸质文件依然大行其道,并且承载了相当多的敏感甚至机密的信息。本系统利用RFID技术的远距离探测,并借鉴成熟的图书管理体系,采用了文件监控与安全报警的方法,安全高效地实现了纸质涉密文件的流转管理和安全管理,降低了泄密事件的发生率,提高了纸质涉密文件的管理效率。

  5. Continuous Versioning-Based Auditable File System%基于连续多版本的可审计文件系统

    Institute of Scientific and Technical Information of China (English)

    黄荣荣; 舒继武; 陈康; 肖达

    2009-01-01

    随着越来越多的法律法规要求将电子数据纳入审计监督范围,电子数据安全审计变得愈来愈重要.电子数据审计要求为数据的更改生成可验证的审计跟踪记录.现有的针对电子数据审计的系统因为不能防止内部人员的攻击以保证审计跟踪记录的安全可信,无法很好地满足用户需求.设计并实现了一个基于连续多版本的可审计文件系统CV-AFS,通过连续多版本技术连续捕获和保存文件系统数据变化,引入了一个可信的审计代理负责生成相应的审计跟踪记录,事后审计机构可根据审计跟踪记录来对数据进行审计,从而防止了内部人员的攻击.通过使用增量Hash算法,降低了生成审计跟踪记录的开销.作者在Linux上基于多版本文件系统ext3cow实现了CV-AFS的原型系统并进行了性能测试.Postmark的测试结果表明,CV-AFS的总时间开销要比使用传统完全Hash算法的开销降低43.5%.%With the trend of more and more recent federal, state and local legislation mandating the retention and access of electronic records and audit information, the security audit of digital data becomes more and more important. The key requirement of the digital audit is to generate verifiable audit trails on the change of electronic records. Current systems for compliance with digital audit legislation fail to provide the security and trustworthiness of audit trails in the presence of a powerful insider adversary. A continuous versioning-based auditable file system, CV-AFS, is presented. All changes to data are recorded and the system will construct a data history through continuous versioning. A trusted audit agent is introduced to generate corresponding audit trails. At a later time, an auditor may verify the version history of a file according to the audit trails, and thus important data can be protected against insider attacks. The overhead of generating audit trails is reduced through the use of

  6. 78 FR 21930 - Aquenergy Systems, Inc.; Notice of Intent To File License Application, Filing of Pre-Application...

    Science.gov (United States)

    2013-04-12

    ... Energy Regulatory Commission Aquenergy Systems, Inc.; Notice of Intent To File License Application... Filing: Notice of Intent to File License Application and Request to Use the Traditional Licensing Process. b. Project No.: P-2428-004. c. Date Filed: November 11, 2012. d. Submitted by: Aquenergy...

  7. An auction based seeder incentive algorithm for multi -torrent file systems%多Torrent下基于拍卖的种子节点激励算法

    Institute of Scientific and Technical Information of China (English)

    李晓义; 李治军; 姜守旭

    2012-01-01

    This paper investigates the problem that the current multi-torrent file systems lack incentives for seeder nodes, and suggests that practical multi-torrent file systems are very common, thus a good environment for seeder incentive is created; The tit for tat (TFT) incentive mechanism aims to maximize the download speed without considering the importance of seeder, so it can not be used in seeder incentive. On the basis of this, it presents an auction based seeder incentive algorithm (ABSI) : first the seeder runs an auction for its bandwidth, then the leechers send their bids to the seeder, and the seeder decides how to allocate the bandwidth. The effectiveness of the ABSI and the download time of the system are also analyzed. The experiments showed the benefits of the approach.%针对多Torrent文件系统种子节点缺乏有效激励的问题进行了研究,指出现实中多Torrent文件系统大量存在,这为种子节点激励提供了环境;争锋相对(TFT)机制其目的是用来最大化下载带宽,但没有考虑种子节点的重要作用,因此不能用于种子节点激励.进而提出了基于拍卖的种子节点激励算法(ABSI):种子节点对带宽进行拍卖,leecher节点进行出价,种子节点根据leecher节点的出价进行带宽分配.同时分析了该算法对种子节点的激励效果以及在此情况下节点下载时间的变化.实验表明该算法可以很好地用于种子节点激励.

  8. SU-E-T-644: QuAArC: A 3D VMAT QA System Based On Radiochromic Film and Monte Carlo Simulation of Log Files

    Energy Technology Data Exchange (ETDEWEB)

    Barbeiro, A.R.; Ureba, A.; Baeza, J.A.; Jimenez-Ortega, E.; Plaza, A. Leal [Universidad de Sevilla, Departamento de Fisiologia Medica y Biofisica, Seville (Spain); Linares, R. [Hospital Infanta Luisa, Servicio de Radiofisica, Seville (Spain); Mateos, J.C.; Velazquez, S. [Hospital Universitario Virgen del Rocio, Servicio de Radiofisica, Seville (Spain)

    2015-06-15

    Purpose: VMAT involves two main sources of uncertainty: one related to the dose calculation accuracy, and the other linked to the continuous delivery of a discrete calculation. The purpose of this work is to present QuAArC, an alternative VMAT QA system to control and potentially reduce these uncertainties. Methods: An automated MC simulation of log files, recorded during VMAT treatment plans delivery, was implemented in order to simulate the actual treatment parameters. The linac head models and the phase-space data of each Control Point (CP) were simulated using the EGSnrc/BEAMnrc MC code, and the corresponding dose calculation was carried out by means of BEAMDOSE, a DOSXYZnrc code modification. A cylindrical phantom was specifically designed to host films rolled up at different radial distances from the isocenter, for a 3D and continuous dosimetric verification. It also allows axial and/or coronal films and point measurements with several types of ion chambers at different locations. Specific software was developed in MATLAB in order to process and evaluate the dosimetric measurements, which incorporates the analysis of dose distributions, profiles, dose difference maps, and 2D/3D gamma index. It is also possible to obtain the experimental DVH reconstructed on the patient CT, by an optimization method to find the individual contribution corresponding to each CP on the film, taking into account the total measured dose, and the corresponding CP dose calculated by MC. Results: The QuAArC system showed high reproducibility of measurements, and consistency with the results obtained with the commercial system implemented in the verification of the evaluated treatment plans. Conclusion: A VMAT QA system based on MC simulation and high resolution dosimetry with film has been developed for treatment verification. It shows to be useful for the study of the real VMAT capabilities, and also for linac commissioning and evaluation of other verification devices.

  9. Large file storage solution for OpenStack-based cloud storage system%基于OpenStack的云存储系统的大文件存储方案

    Institute of Scientific and Technical Information of China (English)

    邵珠兴; 陈彩

    2015-01-01

    To solve deficiencies in gigabyte large file storage of the obj ect storage service Swift of open source cloud platform OpenStack,a storage solution of gigabyte large file based on file segmenting,segments merging,concurrent processing was presented.Firstly,the Swift structure and its characteristics were analyzed,based on this,the hierarchical architecture of cloud storage system was constructed.Then,the storage strategy of gigabyte large file was established,and the key data structure and the core process of upload download were designed,and this solution was implemented with Java multi-threading.Finally,the cloud storage experiment environment was deployed,and the feasibility of the solution was proved through the experiment.The experimental results show that this solution breaks through the Swift restrictions on file size and improves the file upload and download speed.%为解决开源云平台OpenStack的对象存储服务Swift在存储GB级大文件方面的不足,提出基于文件分割、片段合并、并行处理的GB级大文件的存储方案。分析Swift体系结构及其特点,在此基础上构建云存储系统的层次架构;制定GB级大文件的存储策略,设计关键数据结构和上传下载的核心流程,使用Java多线程实现该方案。部署云存储实验环境,通过实验验证了该方案的可行性,该方案突破了Swift对文件大小的限制,提高了文件的上传和下载速度。

  10. File Encryption System Based on Triple DES and RSA%基于Triple DES与RSA的文件加密系统

    Institute of Scientific and Technical Information of China (English)

    胡振

    2012-01-01

    Comparing the characteristics of symmetric cryptography and asymmetric cryptography, this paper outlines the basic principles of the Triple DES algorithm and the RSA algorithm. On the basis of a detailed analysis of issues related to file security and in-depth study on . NET Framework encryption algorithm class, this paper proposes the file encryption scheme on the combination of the Triple DES algorithm and the RSA algorithm, designs the system' s overall structure and the basic process, then the system is realized with VB. NET. After practice, the results show that the system is simple and convenient for file encryption.%比较对称密码体制与非对称密码体制的特点,简述Triple DES算法与RSA算法的基本原理.在详细分析文件安全的相关问题和深入研究.NET Framework密码算法类的基础上,提出Triple DES算法与RSA算法结合运用的文件加密方案,设计系统的总体结构和基本流程,并以VB.NET实现了基于Triple DES与RSA的文件加密系统.实践表明,用本系统进行文件加密简单而方便.

  11. Design and Implementation of File System Management Tool Based on Database%基于数据库的文件系统管理工具设计与实现

    Institute of Scientific and Technical Information of China (English)

    石京燕; 陈德清

    2015-01-01

    Traditional file system management tools achieve management and monitoring functions by traversing file directory tree to get metadata information. For large file systems,it is a time consumed task to get metadata which can not meet the demand of the current management of large data background. This paper integrates policy engine Robinhood and TORQUE job management system. A distributed parallel computing is used to get the file system metadata information which is saved into MySQL database. Based on metadata information saved in database,the tool achieves monitoring,file management and system backup. The tests indicate that distributed computing is able to fully use the computing utilities of the cluster,not able to enhance the speed of traversing file system,and makes sure of the progressing on monitoring, management and back up of the file system.%传统的文件系统管理工具通过实时遍历文件目录树获取文件元数据信息,以实现管理监视功能。但对于大型文件系统,元数据信息的获取需要耗费大量时间,传统管理工具无法适应当前大数据背景下的管理需求。为此,基于数据库技术设计一种新的文件系统管理工具。该工具集成Robinhood策略引擎与TORQUE作业管理系统,通过分布式并行计算获取文件系统元数据信息,并将信息保存到MySQL数据库,同时基于数据库中的元数据信息,实现文件系统的监视、管理和备份功能。实验结果表明,采用分布式并行计算能够充分利用集群的计算资源,提高文件系统的遍历速率,保证文件系统监视、管理和备份的顺利进行。

  12. Stochastic Petri net analysis of a replicated file system

    Science.gov (United States)

    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.

  13. 一种基于固件的云系统策略文件完整性安全机制%A FIRMWARE-BASED SECURE MECHANISM FOR POLICY FILES INTEGRITY IN CLOUD SYSTEM

    Institute of Scientific and Technical Information of China (English)

    龚敏斌; 潘理

    2014-01-01

    Aiming at the security threatening on integrity of shared policy files amongst servers in cloud system, we propose a novel firmware-based policy security mechanism.The mechanism can make secure and swift interaction of the shared policy files between the service platforms in cloud system, and makes integrity verification on shared policy files, thus enhances the security of policy files shared amongst the servers working cooperatively.Experimental results indicate that the mechanism effectively achieves the integrity security of the shared policy files in cloud system environment, and improves the management efficiency of cloud administrators simultaneously.%针对云系统服务器之间共享策略文件所面临的完整性安全威胁,提出一种新的基于固件的策略安全机制。该机制可在云系统服务器平台之间安全且快速地进行共享策略文件交互,并可对共享策略文件进行完整性校验,进而提高协同工作的服务器所共享策略文件的安全性。实验结果表明,该机制有效实现了云系统环境下共享策略文件的完整性安全,同时提高了云系统管理员的管理效率。

  14. Design and Implementation of Log Structured FAT and ExFAT File Systems

    Directory of Open Access Journals (Sweden)

    Keshava Munegowda

    2014-08-01

    Full Text Available The File Allocation Table (FAT file system is supported in multiple Operating Systems (OS. Hence, FAT file system is universal exchange format for files/directories used in Solid State Drives (SSD and Hard disk Drives (HDD. The Microsoft Corporation introduced the new file system called Extended FAT file system (ExFAT to support larger size storage devices. The ExFAT file system is optimized to use with SSDs. But, Both FAT and ExFAT are not power fail safe. This means that the uncontrolled power loss or abrupt storage device removable from the computer system, during file system update, causes corruption of file system meta data and hence it leads to loss of data in storage device. This paper implements the Logging and Committing features to FAT and ExFAT file systems and ensures that the file system meta data is consistent across the abrupt power loss or device removal from the computer system.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  16. SU-E-T-363: Error Detection Comparison of EPID and MLC Log File Based IMRT QA Systems

    Energy Technology Data Exchange (ETDEWEB)

    Defoor, D; Obeidat, M; Linden, P; Kirby, N; Papanikolaou, N; Stathakis, S [University of Texas Health Science Center at San Antonio, San Antonio, TX (United States); Mavroidis, P [University of North Carolina, Chapel Hill, NC (United States)

    2015-06-15

    Purpose: In this study we will compare the ability of three QA methods (Delta4, MU-EPID, Dynalog QA) to detect specific errors. Methods: A Varian Novalis Tx with a HD120 MLC and aS1000 Electronic Portal Imaging Device (EPID) was used in our study. Multi-leaf collimator (MLC) errors, gantry angle and dose errors were introduced into 5 volumetric arc therapy (VMAT) plans. 3D dose distributions calculated with data from the EPID and Dynalog QA methods were compared with the planned dose distribution. The gamma passing percentages as well as percentage error of planning target volume (PTV) dose were used for passing determination. Baselines for gamma passing percentages and PTV dose were established by measuring the original plan 5 times consecutively. Standard passing thresholds as well as thresholds derived from receiver operator characteristic (ROC) analysis and 2 standard deviation (SD) criteria were used. Results: When applying the standard 95% pass rate at 3%/3mm gamma analysis 14, 21 and 8 of 30 errors were detected by the Delta4, MU-EPID and Dynalog QA methods respectively. Thresholds set at 2 SD from our base line measurements resulted in the detection of 18, 9 and 14 of 30 errors for the Delta4, MU-EPID and Dynalog QA methods respectively. When using D2 of the PTV as a metric the Dynalog QA detected 20 of 30 errors while the EPID method detected 14 of 30 errors. Using D98 of the PTV, Dynalog QA detected 13 of 30 while the EPID detected 3 of 30 errors. Conclusion: Although MU-EPID detected the most errors at the standard 95% cutoff it also produced the most false detections in the baseline data. The Dynalog QA was the most effective when the ROC adjusted passing threshold was used. D2 was more effective as a metric for detecting errors than D98.

  17. Building a Portable File System for Heterogeneous Clusters

    Institute of Scientific and Technical Information of China (English)

    HUANG Qifeng; YANG Guangwen; ZHENG Weimin; SHEN Meiming; DENG Yiyan

    2005-01-01

    Existing in-kernel distributed file systems cannot cope with the higher requirements in well-equipped cluster environments, especially when the system becomes larger and inevitably heterogeneous. TH-CluFS is a cluster file system designed for large heterogeneous systems. TH-CluFS is implemented completely in the user space by emulating the network file system (NFS) V2 server, and is easily portable to other portable operating system interface (POSIX)-compliant platforms with application programming/binary interface API/ABI compliance. In addition, TH-CluFS uses a serverless architecture which flexibly distributes data at file granularity and achieves a consistent file system view from distributed metadata. The global cache makes full use of the aggregated memories and disks in the cluster to optimize system performance. Experimental results suggest that although TH-CluFS is implemented as user-level components, it functions as a portable, single system image, and scalable cluster file system with acceptable performance sacrifices.

  18. Non-POSIX File System for LHCb Online Event Handling

    CERN Document Server

    Garnier, J C; Cherukuwada, S S

    2011-01-01

    LHCb aims to use its O(20000) CPU cores in the high level trigger (HLT) and its 120 TB Online storage system for data reprocessing during LHC shutdown periods. These periods can last a few days for technical maintenance or only a few hours during beam interfill gaps. These jobs run on files which are staged in from tape storage to the local storage buffer. The result are again one or more files. Efficient file writing and reading is essential for the performance of the system. Rather than using a traditional shared file-system such as NFS or CIFS we have implemented a custom, light-weight, non-Posix network file-system for the handling of these files. Streaming this file-system for the data-access allows to obtain high performance, while at the same time keep the resource consumption low and add nice features not found in NFS such as high-availability, transparent fail-over of the read and write service. The writing part of this streaming service is in successful use for the Online, real-time writing of the d...

  19. 基于Hadoop分布式文件系统快照技术的研究与改进%Research and Improvement of Snapshot Technology Based on Hadoop Distributed File System

    Institute of Scientific and Technical Information of China (English)

    杨彬

    2015-01-01

    The ability to take snapshots is an essential functionality of any file system, as snapshots enable system administrators to perform data recovery in case of failure. HDFS(Hadoop Distributed File System)is a popular distributed file system for large clus⁃ters of commodity servers. This paper presents a low overhead snapshot solutions for HDFS. The solution obviates the need for complex distributed snapshot algorithms ,takes new snapshot data structures to data replication and distribution in HDFS. we have designed, a fast and efficient snapshot solution based on selective-copy-on-appends.%任何文件系统都具有拍摄快照的能力,快照使系统管理员在系统故障的情况下进行数据恢复。HDFS(Hadoop Dis⁃tributed File System)是一个流行的大型集群商用服务器的分布式文件系统,该文为HDFS提出了一个低开销的快照解决方案。该解决方案,避免使用复杂的分布式快照算法,采用新的快照数据结构解决了在HDFS系统中的数据拷贝和分布问题,设计了一个基于选择性的追加拷贝快照解决方案。

  20. 基于安全局域网分级文件分发系统设计与实现%Gradable file distribution system design and implementation based on security LAN

    Institute of Scientific and Technical Information of China (English)

    许肖威; 刘雄; 戴一奇

    2012-01-01

    通过分析安全局域网系统文件动态分级管理技术机制以及系统基于动态监控交换机的终端行为监控结构,提出了一种基于安全局域网分级文件分发系统的设计与实现方案.该系统解决了原有安全局域网系统监控结构的网络化扩展问题,实现了网络文件的分级可控管理,除了能够防范来自系统外部的普通网络攻击行为外,确保了对系统合法用户操作行为的控制,有效阻止了内部人员信息泄露的基本途径,能够提高各类共享数据的安全性.%By analyzing the technological mechanism of file dynamic grading management in security LAN system and the terminal behavior monitoring structure based on dynamic monitoring switches in the system, this paper introduced a gradable file distribution system design and implementation plan based on security LAN. This system could solve the problem of network extension of monitoring structure in current security LAN system, and achieved gradable and controllable management of network files. The system could not only prevent common network attacks from external system, but also achieved control of users' legal operations in the system, which effectively cut off the fundamental ways of internal users' information divulgence, and significantly enhanced the security of different types of sharing data.

  1. Cross-system log file analysis for hypothesis testing

    NARCIS (Netherlands)

    Glahn, Christian

    2008-01-01

    Glahn, C. (2008). Cross-system log file analysis for hypothesis testing. Presented at Empowering Learners for Lifelong Competence Development: pedagogical, organisational and technological issues. 4th TENCompetence Open Workshop. April, 10, 2008, Madrid, Spain.

  2. National Child Abuse and Neglect Data System (NCANDS) Child File

    Data.gov (United States)

    U.S. Department of Health & Human Services — The National Child Abuse and Neglect Data System (NCANDS) Child File data set consists of child-specific data of all reports of maltreatment to State child...

  3. Cross-system log file analysis for hypothesis testing

    NARCIS (Netherlands)

    Glahn, Christian

    2008-01-01

    Glahn, C. (2008). Cross-system log file analysis for hypothesis testing. Presented at Empowering Learners for Lifelong Competence Development: pedagogical, organisational and technological issues. 4th TENCompetence Open Workshop. April, 10, 2008, Madrid, Spain.

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

    Science.gov (United States)

    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.

  5. Implementation of Virus Prevention Method Based on File System Filter Driver%基于文件过滤驱动的病毒防范方法的实现

    Institute of Scientific and Technical Information of China (English)

    陈建熊; 揭摄; 张鑫

    2013-01-01

      计算机病毒给当今社会造成了较大危害,为了有效防止病毒蔓延,针对当前防病毒软件存在的不足,给出了一种基于文件过滤驱动的文件型病毒防护方法。分析了文件过滤驱动原理,通过在文件系统驱动上层附加一层过滤驱动,来截获上层应用对文件的各种操作,阻止可疑应用程序对可执行文件的写操作,达到主动防御文件型病毒的目的。文章从病毒对文件的打开、写入、关闭以及用户层和驱动通信等方面给出了该方法的实现原理。实验证明该方法能够有效对文件型病毒进行防护。%Computer virus is harmful to society. In view of the defect of the virus detection method existing,a new method of virus pre-vention based on file system filter driver is brought forward to prevent computer virus propagation. Analyze the theory of file system filter driver. With attaching a filter driver to the file system driver to obtain upper application operating on the file of the disk,can prevent sus-picious application program to write on executable file. Thus implement the aim of active defense of the computer virus. Present the detail implementation of this method with opening,writing,closing the executable file by virus and commutation between application and driv-er. The result indicates that this method can prevent the computer virus spreading efficiently.

  6. Secure Deletion on Log-structured File Systems

    CERN Document Server

    Reardon, Joel; Capkun, Srdjan; Basin, David

    2011-01-01

    We address the problem of secure data deletion on log-structured file systems. We focus on the YAFFS file system, widely used on Android smartphones. We show that these systems provide no temporal guarantees on data deletion and that deleted data still persists for nearly 44 hours with average phone use and indefinitely if the phone is not used after the deletion. Furthermore, we show that file overwriting and encryption, methods commonly used for secure deletion on block-structured file systems, do not ensure data deletion in log-structured file systems. We propose three mechanisms for secure deletion on log-structured file systems. Purging is a user-level mechanism that guarantees secure deletion at the cost of negligible device wear. Ballooning is a user-level mechanism that runs continuously and gives probabilistic improvements to secure deletion. Zero overwriting is a kernel-level mechanism that guarantees immediate secure deletion without device wear. We implement these mechanisms on Nexus One smartphon...

  7. The Design of a Secure File Storage System

    Science.gov (United States)

    1979-12-01

    8217brjnw Into the FM process meory to - m - check for proper discretionary access. The complete Dathname, in terms of the FSS file system, - passed to...research shows that a viable approach to the auestion of internal computer security exists. This approach, sometimes termed the "security kernel approach...eration is gninR on, aI significant advantage if the data file is long . kfter theJ file is stored by the 10 process, the FM process gets a ticket to the

  8. Permanent-File-Validation Utility Computer Program

    Science.gov (United States)

    Derry, Stephen D.

    1988-01-01

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

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

    Science.gov (United States)

    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.

  10. Distributing File-Based Data to Remote Sites Within the BABAR Collaboration

    Energy Technology Data Exchange (ETDEWEB)

    Gowdy, Stephen J.

    2002-05-02

    BABAR [1] uses two formats for its data: Objectivity database and root [2] files. This poster concerns the distribution of the latter--for Objectivity data see [3]. The BABAR analysis data is stored in root files--one per physics run and analysis selection channel--maintained in a large directory tree. Currently BABAR has more than 4.5 TBytes in 200,000 root files. This data is (mostly) produced at SLAC, but is required for analysis at universities and research centers throughout the us and Europe. Two basic problems confront us when we seek to import bulk data from slac to an institute's local storage via the network. We must determine which files must be imported (depending on the local site requirements and which files have already been imported), and we must make the optimum use of the network when transferring the data. Basic ftp-like tools (ftp, scp, etc) do not attempt to solve the first problem. More sophisticated tools like rsync [4], the widely-used mirror/synchronization program, compare local and remote file systems, checking for changes (based on file date, size and, if desired, an elaborate checksum) in order to only copy new or modified files. However rsync allows for only limited file selection. Also when, as in BABAR, an extremely large directory structure must be scanned, rsync can take several hours just to determine which files need to be copied. Although rsync (and scp) provides on-the-fly compression, it does not allow us to optimize the network transfer by using multiple streams, adjusting the tcp window size, or separating encrypted authentication from unencrypted data channels.

  11. 基于RBAC的文件级分布式安全访问控制系统的研究%Research on a File Level Distributed Secure Access Control System Based on RBAC

    Institute of Scientific and Technical Information of China (English)

    王俊; 贾连兴; 姚海潮; 何建平

    2011-01-01

    访问控制技术能够有效避免对数据的非法访问,增强对用户行为的管理.依托分布式并行文件系统GlusterFS,结合RBAC思想,设计了一个文件级分布式安全访问控制系统—Distributed Secure Access Control System(DSAS).重点研究了存储系统中RBAC机制的实现方法,提出了基于角色证书的用户身份验证及角色授权机制.测试结果表明,DSAS系统在满足数据安全性需求的同时,同样能够较好地满足存储系统性能需求.%Access control technology can effectively avoid the unauthorized access for data and strengthen the management to the customer behavior. Depended on the distributed parallel file system GlusterFS and combined with the principles of RBAC, this paper designed a file level Distributed Secure Access Control System(DSAS), mainly studied the carrying out of RBAC mechanism method in the storage system, put forward customer identity verification and role authorization mechanism based on the role credential. Test results illustrated that DSAS system can be well fulfill the need for data reliability and security and the need for storage system performance.

  12. Tag Based Client Side Detection of Content Sniffing Attacks with File Encryption and File Splitter Technique

    Directory of Open Access Journals (Sweden)

    Syed Imran Ahmed Qadri,

    2012-09-01

    Full Text Available In this paper we provide a security framework forserver and clientside. In this we provide someprevention methods which will apply for the serverside and alert replication is also on client side.Content sniffing attacks occur if browsers rendernon-HTML files embedded with malicious HTMLcontents or JavaScript code as HTML files. Thismitigation effects such as the stealing of sensitiveinformation through the execution of maliciousJavaScript code. In this framework client access thedata which is encrypted from the server side. Fromthe server data is encrypted using private keycryptography and file is send after splitting so thatwe reduce the execution time. We also add a tag bitconcept which is included for the means of checkingthe alteration; if alteration performed tag bit ischanged. Tag bit is generated bya message digestalgorithm.We have implemented our approach in ajava based environment that can be integrated inweb applications written in various languages.

  13. 基于系统日志文件的计算机系统脆弱性分析%Analysis of the Computer System Vulnerability based on the System Log File

    Institute of Scientific and Technical Information of China (English)

    黄波

    2012-01-01

      随着信息社会的发展,计算机系统的安全是信息社会中信息安全保障的重要部分之一。文章根据Windows系统、数据库系统、防火墙系统的日志文件形式、结构、内容的组成,分析了在计算机操作系统、网络系统中日志文件的安全性及其安全作用,并阐述了实现计算机系统脆弱性分析的根源。%  With the development of information society, the security of the computer system in the information society is the most important part of information security. In this paper, According to form and structure and content of log file in the windows system, database system, firewall system ,analysed the safety and security of log files in the computer operating system and network system, and elaborated the root of realizing computer system vulnerability analysis of through the system log files.

  14. Efficient methodology for implementation of Encrypted File System in User Space

    CERN Document Server

    Kumar, Dr Shishir; Jasra, Sameer Kumar; Jain, Akshay Kumar

    2009-01-01

    The Encrypted File System (EFS) pushes encryption services into the file system itself. EFS supports secure storage at the system level through a standard UNIX file system interface to encrypted files. User can associate a cryptographic key with the directories they wish to protect. Files in these directories (as well as their pathname components) are transparently encrypted and decrypted with the specified key without further user intervention; clear text is never stored on a disk or sent to a remote file server. EFS can use any available file system for its underlying storage without modifications, including remote file servers such as NFS. System management functions, such as file backup, work in a normal manner and without knowledge of the key. Performance is an important factor to users since encryption can be time consuming. This paper describes the design and implementation of EFS in user space using faster cryptographic algorithms on UNIX Operating system. Implementing EFS in user space makes it porta...

  15. A compact file format for labeled transition systems

    NARCIS (Netherlands)

    Langevelde, I.A. van

    2001-01-01

    A compact open file format for labeled transition systems, which are commonly used in specification and verification of concurrent systems, is introduced. This combination of openness, both in specification and implementation, and compactness is unprecedented, since existing formats in this field

  16. ERROR COUNTER-BASED NEGATIVE ACKNOWLEDGEMENT MODE IN CCSDS FILE DELIVERY PROTOCOL

    Institute of Scientific and Technical Information of China (English)

    Xiao Shijie; Yang Mingchuan; Guo Qing

    2011-01-01

    Deep space communication has its own features such as long propagation delays,heavy noise,asymmetric link rates,and intermittent connectivity in space,therefore TCP/IP protocol cannot perform as well as it does in terrestrial communications.Accordingly,the Consultative Committee for Space Data Systems (CCSDS) developed CCSDS File Delivery Protocol (CFDP),which sets standards of efficient file delivery service capable of transferring files to and from mass memory located in the space segment.In CFDP,four optional acknowledge modes are supported to make the communication more reliable.In this paper,we gave a general introduction of typical communication process in CFDP and analysis of its four Negative Acknowledgement (NAK) modes on the respect of file delivery delay and times of retransmission.We found out that despite the shortest file delivery delay,immediate NAK mode suffers from the problem that frequent retransmission may probably lead to network congestion.Thus,we proposed a new mode,the error counter-based NAK mode.By simulation of the case focused on the link between a deep space probe on Mars and a terrestrial station on Earth,we concluded that error counter-based NAK mode has successfully reduced the retransmission times at negligible cost of certain amount of file delivery delay.

  17. Deploying Server-side File System Monitoring at NERSC

    Energy Technology Data Exchange (ETDEWEB)

    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.

  18. 37 CFR 2.34 - Bases for filing.

    Science.gov (United States)

    2010-07-01

    ... registered. If the foreign registration is not in the English language, the applicant must submit a... the English language, the applicant must submit a translation. (4) Claim of priority, based upon an... COMMERCE RULES OF PRACTICE IN TRADEMARK CASES The Written Application § 2.34 Bases for filing. (a)...

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

    CERN Document Server

    Dykstra, David

    2014-01-01

    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 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 both CVMFS and Frontier have added X509-based integrity checking. In this paper we detail and compare the security models of CVMFS and Frontier.

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

    Energy Technology Data Exchange (ETDEWEB)

    Dykstra, D.; Blomer, J. [CERN

    2014-01-01

    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.

  1. Adaptive progressive download based on the MPEG-4 file format

    Institute of Scientific and Technical Information of China (English)

    F(A)RBER Nikolaus; D(O)HLA Stefan; ISSING Jochen

    2006-01-01

    In this paper we describe how progressive download and adaptive streaming can be combined into a simple and efficient streaming framework. Based on the MPEG-4 file format (MP4) we use HTTP for transport and argue that these two components are sufficient for specifying an open streaming architecture. The client selects appropriatechunks from the MP4 file to be transferred based on (1) the header information (i.e. the "moov" box) in the first part of the file and (2) his observation of network throughput. The framework is completely client driven which allows for better server scalability and reduces signalling overhead. We discuss architecture and implementation issues such as complexity, interoperability and scalability and compare to 3GPP PSS Rel-6 adaptive streaming when appropriate. Measurements from a simple MP4/HTTP streaming client are presented showing that appropriate chunks are selected such that increased reliability is achieved.

  2. Web-based access to teaching files in a filmless radiology environment

    Science.gov (United States)

    Rubin, Richard K.; Henri, Christopher J.; Cox, Robert D.; Bret, Patrice M.

    1998-07-01

    This paper describes the incorporation of radiology teaching files within our existing filmless radiology Picture Archiving and Communications System (PACS). The creation of teaching files employs an intuitive World Wide Web (WWW) application that relieves the creator of the technical details involving the underlying PACS and obviates the need for knowledge of Internet publishing. Currently, our PACS supports filmless operation of CT, MRI, and ultrasound modalities, conforming to the Digital Imaging and Communications in Medicine (DICOM) and Health Level 7 (HL7) standards. Web-based teaching files are one module in a suite of WWW tools, developed in-house, for platform independent management of radiology data. The WWW browser tools act as liaison between inexpensive desktop PCs and the DICOM PACS. The creation of a teaching file is made as efficient as possible by allowing the creator to select the images and prepare the text within a single application, while finding and reviewing existing teaching files is simplified with a flexible, multi-criteria searching tool. This efficient and easy-to-use interface is largely responsible for the development of a database, currently containing over 400 teaching files, that has been generated in a short period of time.

  3. Screw-in forces during instrumentation by various file systems

    Science.gov (United States)

    2016-01-01

    Objectives The purpose of this study was to compare the maximum screw-in forces generated during the movement of various Nickel-Titanium (NiTi) file systems. Materials and Methods Forty simulated canals in resin blocks were randomly divided into 4 groups for the following instruments: Mtwo size 25/0.07 (MTW, VDW GmbH), Reciproc R25 (RPR, VDW GmbH), ProTaper Universal F2 (PTU, Dentsply Maillefer), and ProTaper Next X2 (PTN, Dentsply Maillefer, n = 10). All the artificial canals were prepared to obtain a standardized lumen by using ProTaper Universal F1. Screw-in forces were measured using a custom-made experimental device (AEndoS-k, DMJ system) during instrumentation with each NiTi file system using the designated movement. The rotation speed was set at 350 rpm with an automatic 4 mm pecking motion at a speed of 1 mm/sec. The pecking depth was increased by 1 mm for each pecking motion until the file reach the working length. Forces were recorded during file movement, and the maximum force was extracted from the data. Maximum screw-in forces were analyzed by one-way ANOVA and Tukey's post hoc comparison at a significance level of 95%. Results Reciproc and ProTaper Universal files generated the highest maximum screw-in forces among all the instruments while M-two and ProTaper Next showed the lowest (p < 0.05). Conclusions Geometrical differences rather than shaping motion and alloys may affect the screw-in force during canal instrumentation. To reduce screw-in forces, the use of NiTi files with smaller cross-sectional area for higher flexibility is recommended. PMID:27847752

  4. Cross-system log file analysis for hypothesis testing

    NARCIS (Netherlands)

    Glahn, Christian; Specht, Marcus; Schoonenboom, Judith; Sligte, Henk; Moghnieh, Ayman; Hernández-Leo, Davinia; Stefanov, Krassen; Lemmers, Ruud; Koper, Rob

    2008-01-01

    Glahn, C., Specht, M., Schoonenboom, J., Sligte, H., Moghnieh, A., Hernández-Leo, D. Stefanov, K., Lemmers, R., & Koper, R. (2008). Cross-system log file analysis for hypothesis testing. In H. Sligte & R. Koper (Eds.), Proceedings of the 4th TENCompetence Open Workshop. Empowering Learners for Lifel

  5. AliEnFS - a Linux File System for the AliEn Grid Services

    CERN Document Server

    Peters, A J; Buncic, P; Peters, Andreas J.

    2003-01-01

    Among the services offered by the AliEn (ALICE Environment http://alien.cern.ch) Grid framework there is a virtual file catalogue to allow transparent access to distributed data-sets using various file transfer protocols. $alienfs$ (AliEn File System) integrates the AliEn file catalogue as a new file system type into the Linux kernel using LUFS, a hybrid user space file system framework (Open Source http://lufs.sourceforge.net). LUFS uses a special kernel interface level called VFS (Virtual File System Switch) to communicate via a generalised file system interface to the AliEn file system daemon. The AliEn framework is used for authentication, catalogue browsing, file registration and read/write transfer operations. A C++ API implements the generic file system operations. The goal of AliEnFS is to allow users easy interactive access to a worldwide distributed virtual file system using familiar shell commands (f.e. cp,ls,rm ...) The paper discusses general aspects of Grid File Systems, the AliEn implementation...

  6. AliEnFS - a Linux File System for the AliEn Grid Services

    OpenAIRE

    Peters, Andreas J.; Saiz, P.; Buncic, P.

    2003-01-01

    Among the services offered by the AliEn (ALICE Environment http://alien.cern.ch) Grid framework there is a virtual file catalogue to allow transparent access to distributed data-sets using various file transfer protocols. $alienfs$ (AliEn File System) integrates the AliEn file catalogue as a new file system type into the Linux kernel using LUFS, a hybrid user space file system framework (Open Source http://lufs.sourceforge.net). LUFS uses a special kernel interface level called VFS (Virtual F...

  7. 76 FR 71019 - Amendment of Inspector General's Operation and Reporting (IGOR) System Investigative Files (EPA-40)

    Science.gov (United States)

    2011-11-16

    ... AGENCY Amendment of Inspector General's Operation and Reporting (IGOR) System Investigative Files (EPA-40... General's Operation and Reporting (IGOR) System Investigative Files (EPA-40) to the Inspector General... The Inspector General's Operation and Reporting (IGOR) System Investigative Files (EPA-40) will...

  8. 5 CFR 293.504 - Composition of, and access to, the Employee Medical File System.

    Science.gov (United States)

    2010-01-01

    ... Employee Medical File System. 293.504 Section 293.504 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PERSONNEL RECORDS Employee Medical File System Records § 293.504 Composition of, and access to, the Employee Medical File System. (a) All employee occupational medical...

  9. Overview and Status of the Ceph File System

    CERN Document Server

    CERN. Geneva

    2017-01-01

    The Ceph file system (CephFS) is the POSIX-compatible distributed file system running on top of Ceph's powerful and stable object store. This presentation will give a general introduction of CephFS and detail the recent work the Ceph team has done to improve its stability and usability. In particular, we will cover directory fragmentation, multiple active metadata servers, and directory subtree pinning to metadata servers, features slated for stability in the imminent Luminous release. This talk will also give an overview of how we are measuring performance of multiple active metadata servers using large on-demand cloud deployments. The results will highlight how CephFS distributes metadata load across metadata servers to achieve scaling. About the speaker Patrick Donnelly is a software engineer at Red Hat, Inc. currently working on the Ceph distributed file system. In 2016 he completed his Ph.D. in computer science at the University of Notre Dame with a dissertation on the topic of file transfer management...

  10. File-Based Data Flow in the CMS Filter Farm

    Energy Technology Data Exchange (ETDEWEB)

    Andre, J.M.; et al.

    2015-12-23

    During the LHC Long Shutdown 1, the CMS Data Acquisition system underwent a partial redesign to replace obsolete network equipment, use more homogeneous switching technologies, and prepare the ground for future upgrades of the detector front-ends. The software and hardware infrastructure to provide input, execute the High Level Trigger (HLT) algorithms and deal with output data transport and storage has also been redesigned to be completely file- based. This approach provides additional decoupling between the HLT algorithms and the input and output data flow. All the metadata needed for bookkeeping of the data flow and the HLT process lifetimes are also generated in the form of small “documents” using the JSON encoding, by either services in the flow of the HLT execution (for rates etc.) or watchdog processes. These “files” can remain memory-resident or be written to disk if they are to be used in another part of the system (e.g. for aggregation of output data). We discuss how this redesign improves the robustness and flexibility of the CMS DAQ and the performance of the system currently being commissioned for the LHC Run 2.

  11. Efficient stereoscopic contents file format on the basis of ISO base media file format

    Science.gov (United States)

    Kim, Kyuheon; Lee, Jangwon; Suh, Doug Young; Park, Gwang Hoon

    2009-02-01

    A lot of 3D contents haven been widely used for multimedia services, however, real 3D video contents have been adopted for a limited applications such as a specially designed 3D cinema. This is because of the difficulty of capturing real 3D video contents and the limitation of display devices available in a market. However, diverse types of display devices for stereoscopic video contents for real 3D video contents have been recently released in a market. Especially, a mobile phone with a stereoscopic camera has been released in a market, which provides a user as a consumer to have more realistic experiences without glasses, and also, as a content creator to take stereoscopic images or record the stereoscopic video contents. However, a user can only store and display these acquired stereoscopic contents with his/her own devices due to the non-existence of a common file format for these contents. This limitation causes a user not share his/her contents with any other users, which makes it difficult the relevant market to stereoscopic contents is getting expanded. Therefore, this paper proposes the common file format on the basis of ISO base media file format for stereoscopic contents, which enables users to store and exchange pure stereoscopic contents. This technology is also currently under development for an international standard of MPEG as being called as a stereoscopic video application format.

  12. Tag Based Client Side Detection of Content Sniffing Attacks with File Encryption and File Splitter Technique

    Directory of Open Access Journals (Sweden)

    Syed Imran Ahmed Qadri

    2012-09-01

    Full Text Available In this paper we provide a security framework for server and client side. In this we provide some prevention methods which will apply for the server side and alert replication is also on client side. Content sniffing attacks occur if browsers render non-HTML files embedded with malicious HTML contents or JavaScript code as HTML files. This mitigation effects such as the stealing of sensitive information through the execution of malicious JavaScript code. In this framework client access the data which is encrypted from the server side. From the server data is encrypted using private key cryptography and file is send after splitting so that we reduce the execution time. We also add a tag bit concept which is included for the means of checking the alteration; if alteration performed tag bit is changed. Tag bit is generated by a message digest algorithm. We have implemented our approach in a java based environment that can be integrated in web applications written in various languages.

  13. Sharing lattice QCD data over a widely distributed file system

    Science.gov (United States)

    Amagasa, T.; Aoki, S.; Aoki, Y.; Aoyama, T.; Doi, T.; Fukumura, K.; Ishii, N.; Ishikawa, K.-I.; Jitsumoto, H.; Kamano, H.; Konno, Y.; Matsufuru, H.; Mikami, Y.; Miura, K.; Sato, M.; Takeda, S.; Tatebe, O.; Togawa, H.; Ukawa, A.; Ukita, N.; Watanabe, Y.; Yamazaki, T.; Yoshie, T.

    2015-12-01

    JLDG is a data-grid for the lattice QCD (LQCD) community in Japan. Several large research groups in Japan have been working on lattice QCD simulations using supercomputers distributed over distant sites. The JLDG provides such collaborations with an efficient method of data management and sharing. File servers installed on 9 sites are connected to the NII SINET VPN and are bound into a single file system with the GFarm. The file system looks the same from any sites, so that users can do analyses on a supercomputer on a site, using data generated and stored in the JLDG at a different site. We present a brief description of hardware and software of the JLDG, including a recently developed subsystem for cooperating with the HPCI shared storage, and report performance and statistics of the JLDG. As of April 2015, 15 research groups (61 users) store their daily research data of 4.7PB including replica and 68 million files in total. Number of publications for works which used the JLDG is 98. The large number of publications and recent rapid increase of disk usage convince us that the JLDG has grown up into a useful infrastructure for LQCD community in Japan.

  14. 29 CFR 4902.11 - Specific exemptions: Office of Inspector General Investigative File System.

    Science.gov (United States)

    2010-07-01

    ... Investigative File System. 4902.11 Section 4902.11 Labor Regulations Relating to Labor (Continued) PENSION... General Investigative File System. (a) Criminal Law Enforcement. (1) Exemption. Under the authority... Inspector General Investigative File System—PBGC” from the provisions of 5 U.S.C. 552a (c)(3), (c)(4),...

  15. 29 CFR 1602.43 - Commission's remedy for school systems' or districts' failure to file report.

    Science.gov (United States)

    2010-07-01

    ...' failure to file report. Any school system or district failing or refusing to file report EEO-5 when... 29 Labor 4 2010-07-01 2010-07-01 false Commission's remedy for school systems' or districts' failure to file report. 1602.43 Section 1602.43 Labor Regulations Relating to Labor (Continued)...

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

    Science.gov (United States)

    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

  17. Nickel-Titanium Single-file System in Endodontics.

    Science.gov (United States)

    Dagna, Alberto

    2015-10-01

    This work describes clinical cases treated with a innovative single-use and single-file nickel-titanium (NiTi) system used in continuous rotation. Nickel-titanium files are commonly used for root canal treatment but they tend to break because of bending stresses and torsional stresses. Today new instruments used only for one treatment have been introduced. They help the clinician to make the root canal shaping easier and safer because they do not require sterilization and after use have to be discarded. A new sterile instrument is used for each treatment in order to reduce the possibility of fracture inside the canal. The new One Shape NiTi single-file instrument belongs to this group. One Shape is used for complete shaping of root canal after an adequate preflaring. Its protocol is simple and some clinical cases are presented. It is helpful for easy cases and reliable for difficult canals. After 2 years of clinical practice, One Shape seems to be helpful for the treatment of most of the root canals, with low risk of separation. After each treatment, the instrument is discarded and not sterilized in autoclave or re-used. This single-use file simplifies the endodontic therapy, because only one instrument is required for canal shaping of many cases. The respect of clinical protocol guarantees predictable good results.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  19. Design and Realization of Files Storage Service System Based on ASP.NET 2.0%基于ASP.NET 2.0文件存储服务系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    张江露; 陈晓晖

    2011-01-01

    针对目前高校公共计算机机房实验教学和管理的存在的问题,利用Visual Studio 2005+SQL Server 2005构建了基于ASP.NET2.0的HUSTFILES文件存储服务系统。如何设计与实现文件存储服务,文中采用VS2005工具、C#语言重点分析了该系统的设计思路与实现过程,讨论了其关键技术及其主要实现方法。HUSTFILES文件存储服务系统以其操作简单、安全可靠、方便灵活等特点,在学校各类公共计算机应用环境中,具有较强的实用价值。%Aiming at the problems of experiment,teaching and management in the public computer room of the colleges,Visual Studio 2005 and SQL Server 2005 is used to create the HUSTFILES file storage and service system based on ASP.NET 2.0.VS 2005 tools and C# is used to analyze the design idea and realization process of the system.The key technology and it's main realization method is discussed.By it's characteristics of simplicity,safety,convenience and flexibility,HUSTFILES file storage and service system has the strong practical value in all kinds of public computer application environment in the college.

  20. Research on Coffee File System Based on Wireless Sensor Networks%基于无线传感器网络文件系统 Coffee 的研究

    Institute of Scientific and Technical Information of China (English)

    苏铅坤; 罗克露; 周强

    2013-01-01

      现有的桌面甚至是嵌入式一些文件系统不能适应资源受限的无线自组织网络传感器节点,这就要求重新设计文件系统。文中分析了设计 WSNs 专用文件系统的必要性,在 WSNs 中 FLASH 文件系统设计需要考虑的额外问题及现有FLASH 文件系统 JFFS2和 YAFFS 的缺陷。在分析现有的无线传感网络文件系统的基础上,选择了网络节点操作系统 Con-tiki 中的 Coffee 文件系统作为研究对象,深入源代码,详细分析 Coffee 的原理、设计思想及实现细节,并给出其移植到其它平台的通用方法,最后在延长 FLASH 使用寿命、高可靠性、大规模存储的方向上对 Coffee 提出了4种改进方法。这对WSNs 文件系统理论研究及实际应用具有重要意义。%The existing file systems designed for desktops and even some normal embedded file systems can not be adapted to resource-constrained wireless sensor nodes,so redesigning a special file system is required in such applications. In this paper,first analyze the ne-cessity of design such a file system for WSNs,the extra consideration when design a FLASH file system for WSNs,and the defects of ex-isting FLASH file systems,JFFS2 and YAFFS. After the introduction of current existing WSNs file systems,choose the Coffee file system as research target which comes from Contiki WSNs operating system. After a thorough analysis of the design principles and implementa-tion details of Coffee,pose a common method to port it to other platforms. In the end,put forward four ways to optimize Coffee,aimed at extending FLASH working time,high reliability and enabling large-scale storage. This work is useful and significant for designing WSNs applications and further researches.

  1. World coordinate system keywords for FITS files from Lick Observatory

    Science.gov (United States)

    Allen, Steven L.; Gates, John; Kibrick, Robert I.

    2010-07-01

    Every bit of metadata added at the time of acquisition increases the value of image data, facilitates automated processing of those data, and decreases the effort required during subsequent data curation activities. In 2002 the FITS community completed a standard for World Coordinate System (WCS) information which describes the celestial coordinates of pixels in astronomical image data. Most of the instruments in use at Lick Observatory and Keck Observatory predate this standard. None of them was designed to produce FITS files with celestial WCS information. We report on the status of WCS keywords in the FITS files of various astronomical detectors at Lick and Keck. These keywords combine the information from sources which include the telescope pointing system, the optics of the telescope and instrument, a description of the pixel layout of the detector focal plane, and the hardware and software mappings between the silicon pixels of the detector and the pixels in the data array of the FITS file. The existing WCS keywords include coordinates which refer to the detector structure itself (for locating defects and artifacts), but not celestial coordinates. We also present proof-of-concept from the first data acquisition system at Lick Observatory which inserts the WCS keywords for a celestial coordinate system.

  2. Motivators, Barriers and Concerns in Adoption of Electronic Filing System: Survey Evidence from Malaysian Professional Accountants

    Directory of Open Access Journals (Sweden)

    Ming-Ling Lai

    2010-01-01

    Full Text Available Problem statement: Worldwide, electronic filing (e-filing system and its' adoption has attracted much attention, however, scholarly study on accounting professionals' acceptance of e-filing system is scant. Approach: This study aimed (i to examine factors that motivated professional accountants to use e-filing (ii to solicit their usage experience and (iii to assess the barriers to adoption and other compliance considerations. The questionnaire survey was administered on 700 professionals from tax practice and commercial sectors who attended "Budget 2008" Tax Seminars, organized by the Malaysian Institute of Accountants in Peninsular Malaysia. In total, 456 usable responses from accounting and tax professionals were collected and analyzed. Results: The survey found out of 456 respondents, just 23.7% had used e-filing in 2007 to file personal tax return forms. Majority of the e-filers opted to use e-filing for the sake of convenience (55.8%, in faith to get faster tax refund (16.8% and speed of filing (15.9%. For those who did not use e-filing, the key impediments were concerned over the security and did not trust of e-filing system. Some (4.8% were unable to access to the e-filing website. Overall, just 26.1% of the professionals surveyed had confidence in the IRBM in managing the e-filing system successfully. Majority (41.2% thought that 'speedy tax refund' to be the most desirable incentive to motivate individuals to use e-filing. Conclusion: As the IRBM is counting on professional accountants to promote the usage of e-filing system, this study provided important insights to the IRBM to developing marketing and business strategies to motivate professional accountant in business to use e-filing in order to accelerate the diffusion of e-filing system in a developing country like Malaysia.

  3. Thesaurus of descriptors for the vertical file system

    Energy Technology Data Exchange (ETDEWEB)

    1977-09-01

    The Thesaurus used for the NYIT Energy Information Center is presented. The center is a comprehensive information service covering every aspect of energy conservation and related technology, including conservation programs and practices, alternative energy systems, energy legislation, and public policy development in the United States and abroad. The Thesaurus includes all subject headings found in the Vertical File as well as other cross referenced terms likely to come to mind when seeking information on a specific energy area.

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

    Science.gov (United States)

    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

  5. Health Care Information System (HCIS) Data File

    Data.gov (United States)

    U.S. Department of Health & Human Services — The data was derived from the Health Care Information System (HCIS), which contains Medicare Part A (Inpatient, Skilled Nursing Facility, Home Health Agency (Part A...

  6. Parallel file system with metadata distributed across partitioned key-value store c

    Energy Technology Data Exchange (ETDEWEB)

    Bent, John M.; Faibish, Sorin; Grider, Gary; Torres, Aaron

    2017-09-19

    Improved techniques are provided for storing metadata associated with a plurality of sub-files associated with a single shared file in a parallel file system. The shared file is generated by a plurality of applications executing on a plurality of compute nodes. A compute node implements a Parallel Log Structured File System (PLFS) library to store at least one portion of the shared file generated by an application executing on the compute node and metadata for the at least one portion of the shared file on one or more object storage servers. The compute node is also configured to implement a partitioned data store for storing a partition of the metadata for the shared file, wherein the partitioned data store communicates with partitioned data stores on other compute nodes using a message passing interface. The partitioned data store can be implemented, for example, using Multidimensional Data Hashing Indexing Middleware (MDHIM).

  7. 基于HDF5文件格式的数据管理系统%System of Data Management Based on the File of HDF

    Institute of Scientific and Technical Information of China (English)

    冯金花; 陈建政; 张雄杰

    2011-01-01

    With the scientific and technological development, increasing access to scientific data, how to effectively store and manage huge amounts of data, become a prominent issue。 This article introduces a system based on the Delphi,hdf5 and Pytables,and delivers a database management system based on HDF5.%随着科学技术的发展.获取的科学数据越来越多,如何有效的存储及管理这些海量数据,成为当前一个突出的问题.介绍了基于delphi,hdf5格式以及Python脚本语言的系统体系设计,并给出了一个基于HDF5文件格式的数据管理系统实例.

  8. Generation and use of the Goddard trajectory determination system SLP ephemeris files

    Science.gov (United States)

    Armstrong, M. G.; Tomaszewski, I. B.

    1973-01-01

    Information is presented to acquaint users of the Goddard Trajectory Determination System Solar/Lunar/Planetary ephemeris files with the details connected with the generation and use of these files. In particular, certain sections constitute a user's manual for the ephemeris files.

  9. A File Based Visualization of Software Evolution

    NARCIS (Netherlands)

    Voinea, S.L.; Telea, A.

    2006-01-01

    Software Configuration Management systems are important instruments for supporting development of large software projects. They accumulate large amounts of evolution data that can be used for process accounting and auditing. We study how visualization can help developers and managers to get insight

  10. Reform of lawsuit system and revision of filing conditions

    Institute of Scientific and Technical Information of China (English)

    ZHANG Weiping

    2006-01-01

    Currently the Civil Procedure Law stipulates rather "high conditions" for lawsuits and the reason is that in the institutional design,we have equated the conditions of adjudicating the merits with those of lawsuits and the initiation of lawsuits.The trial of conditions of adjudicating the merits are usually conducted after the beginning of lawsuits,while in China it is carded out before the beginning of lawsuits,and thus the related procedures have become a kind of "pre-lawsuit procedures",and theoretical and institutional confusions and contradictions arise.This article is of the opinion that filing conditions should be separated from those of adjudicating the merits,and the trial of the latter should be incorporated into the proceedings.A "dual,trial structure should be constructed,that is,the trial of conditions for adjudicating the merits goes parallel with that of merit disputes.In the attempt to improve civil procedures,attention should be given to the institutionalization of conditions of adjudicating the merits,which should be reasonably designed and integrated into relevant systems.When reforming the lawsuit system,we should also adjust the courts'trial organs.We recommend not setting up any case-filing or appeal divisions and removing the existing "separation of case-filing and trial".

  11. ON MULTI-APPLICATION-BASED SMART CARD FILE SYSTEM AND ITS IMPLEMENTATION%一种基于多应用智能卡文件系统的研究与实现

    Institute of Scientific and Technical Information of China (English)

    耿伟华; 陈智勇; 何锟; 赵强

    2014-01-01

    Westudythedesignoffilesystemofsmartcardwithsmallcapacityunderthebackgroundofmulti-application.Basedonstatic file management system,we add dynamic storage free space management utilisation and achieve effective management on free space.The reasonable and effective file system design improves the overall performance of the file system of memory card with small capacity.Through the test it shows that design of the file system structure is reasonable,the storage space allocation and recovery algorithm has higher execution speed.%对多任务应用背景下的小容量智能卡的文件系统设计进行研究。在静态文件管理系统基础上,增加动态存储空闲空间管理方法,实现对空闲空间的有效管理。合理有效的文件系统设计,提高了小容量存储卡文件系统的整体性能。经测试表明,文件系统结构设计合理,存储空间分配和回收算法具有较高的执行速度。

  12. Research on Effectiveness Evaluation Algorithm in Filed Integrated Communication System Based on the Improved ADC Method%改进ADC法的野战综合通信系统效能评估算法研究

    Institute of Scientific and Technical Information of China (English)

    许鹏飞; 张伟华; 马润年

    2011-01-01

    以美国工业界武器系统效能咨询委员会提出的ADC模型为基础,构建了野战综合通信系统效能结构图及可靠性框图.将战场环境适应度引入ADC模型中,建立了改进ADC法的野战综合通信系统效能评估模型,并通过实例分析验证了该模型的有效性和科学性.%Based on the ADC model which is advanced by the Weapon System Effectiveness Industry Advisory Committee, the paper builds effectiveness structure block and reliability block diagram of filed integrated communication system(FICS). It introduces field circumstance fitness into the ADC model, founds the effectiveness evaluation model based on the improved ADC model of FICS, and the result of example proves the model to be effective and scientific.

  13. DDNFS: a Distributed Digital Notary File System

    Directory of Open Access Journals (Sweden)

    Alexander Zangerl

    2011-10-01

    Full Text Available Safeguarding online communications using public key cryptography is a well-establishedpractice today, but with the increasing reliance on “faceless”, solely online entities one of thecore aspects of public key cryptography is becoming a substantial problem in practice: Who canwe trust to introduce us to and vouch for some online party whose public key we see for the firsttime? Most existing certification models lack flexibility and have come under attack repeatedlyin recent years[1, 2], and finding practical improvements has a high priority.We propose that the real-world concept of a notary or certifying witness can be adapted totoday’s online environment quite easily, and that such a system when combined with peer-topeertechnologies for defense in depth is a viable alternative to monolithic trust infrastructures.Instead of trusting assurances from a single party, integrity certifications (and data replicationcan be provided among a group of independent parties in a peer-to-peer fashion. As thelikelihood of all such assurance providers being subverted at the very same time is very muchless than that of a single party, overall robustness is improved.This paper presents the design and the implementation of our prototype online notary systemwhere independent computer notaries provide integrity certification and highly-availablereplicated storage, and discusses how this online notary system handles some common threatpatterns.

  14. LR2: Improving Push-Based Live Streaming and File Sharing in Peer-to-Peer Network

    Directory of Open Access Journals (Sweden)

    Jianwei Zhang

    2014-02-01

    Full Text Available Random scheduling strategy has been emphasized and recommended in push-based P2P streaming systems due to its simplicity and high efficiency, and so is the latest first strategy in file sharing systems. However, how to take advantage of the low playout delay feature in the latest first strategy and the high playout probability feature in the random strategy still remains open. In this paper, we propose the LR2 strategy, which incorporates a segmented chunk selection strategy and a random push strategy. Compared with existent strategies, the LR2 strategy has higher playout probability and lower playout delay in live streaming, and has shorter last finish time in file sharing. On the other hand, live streaming and file sharing are unified into the same modeling framework in our strategy, and we think it can provide fundamental insights into studies on the integrated optimization of live streaming and file sharing in P2P network

  15. Sea battle-filed simulation based on Vega

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jing; CHEN Jie; GUO Mao-zu

    2009-01-01

    To study battle-field simulation methods based on Vega, a virtual battle-field simulated by an imaginary combat happened on the sea was designed. The simulation framework in the sea battle-filed included helicopter simulation, fire simulation, collision detection and detonation, and simulation of dynamic sea surface.The method to build the imulation environments and actions to them was discussed. And the simulation experiments were conducted. , It is indicated that the simulated sea battle-field based on Vega is feasible and helpful for forces and battle-field.

  16. DDNFS: a Distributed Digital Notary File System

    CERN Document Server

    Zangerl, Alexander

    2011-01-01

    Safeguarding online communications using public key cryptography is a well-established practice today, but with the increasing reliance on `faceless', solely online entities one of the core aspects of public key cryptography is becoming a substantial problem in practice: Who can we trust to introduce us to and vouch for some online party whose public key we see for the first time? Most existing certification models lack flexibility and have come under attack repeatedly in recent years, and finding practical improvements has a high priority. We propose that the real-world concept of a notary or certifying witness can be adapted to today's online environment quite easily, and that such a system when combined with peer-to-peer technologies for defense in depth is a viable alternative to monolithic trust infrastructures. Instead of trusting assurances from a single party, integrity certifications (and data replication) can be provided among a group of independent parties in a peer-to-peer fashion. As the likeliho...

  17. 76 FR 2681 - Amended Environmental Impact Statement Filing System Guidance for Implementing 40 CFR 1506.9 and...

    Science.gov (United States)

    2011-01-14

    ... AGENCY Amended Environmental Impact Statement Filing System Guidance for Implementing 40 CFR 1506.9 and... guidelines to implement its EIS filing responsibilities. The purpose of the EPA Filing System Guidelines is to provide guidance to Federal agencies on filing EISs, including draft, final, and supplemental...

  18. 77 FR 51530 - Amended Environmental Impact Statement Filing System Guidance for Implementing 40 CFR 1506.9 and...

    Science.gov (United States)

    2012-08-24

    ... AGENCY Amended Environmental Impact Statement Filing System Guidance for Implementing 40 CFR 1506.9 and... guidelines to implement its EIS filing responsibilities. The purpose of the EPA Filing System Guidelines is to provide guidance to Federal agencies on filing EISs, including draft, final, and supplemental...

  19. The influence of two reciprocating single-file and two rotary-file systems on the apical extrusion of debris and its biological relationship with symptomatic apical periodontitis. A systematic review and meta-analysis.

    Science.gov (United States)

    Caviedes-Bucheli, J; Castellanos, F; Vasquez, N; Ulate, E; Munoz, H R

    2016-03-01

    This systematic review and meta-analysis investigated the influence of the number of files (full-sequence rotary-file versus reciprocating single-file systems) used during root canal preparation on the apical extrusion of debris and its biological relationship with the occurrence of symptomatic apical periodontitis. An extensive literature research was carried out in the Medline, ISI Web of Science and Cochrane databases, for relevant articles with the keyword search strategy. Based on inclusion and exclusion criteria, two reviewers independently rated the quality of each study determining the level of evidence of the articles selected. The primary outcome for the meta-analysis was determined by the amount of debris extruded into the periapical tissue during root canal preparation with multiple- or single-file systems in four laboratory studies. Analysis of in vivo release of neuropeptides (SP and CGRP) after root canal preparation with single- or multiple-file systems was also carried out. Amongst the 128 articles initially found, 113 were excluded for being nonrelevant or not fulfilling the selection criteria. Another four articles were excluded after methodology evaluation. Finally, nine laboratory studies and two in vivo studies were included in the systematic review. Four of the laboratory studies were further included for meta-analysis that revealed greater debris extrusion after the use of single-file techniques when compared to multiple-file systems. Analysis of in vivo neuropeptide expression in the periodontal ligament suggests that the design of the instrument is more important than the number of files used. Both rotary and reciprocating single-file systems generate apical extrusion of debris in laboratory studies, or expression of neuropeptides in vivo. Available evidence is limited, but supports the fact that this inflammatory reaction is not influenced by the number of files but the type of movement and the instrument design.

  20. 基于HDFS的企业私有云存储的研究%Research on Private Cloud Storage of Companies Based on Hadoop Distributed File System

    Institute of Scientific and Technical Information of China (English)

    史振华

    2014-01-01

    Nowadays enterprises are faced with the problems of mass data and management. The idea of constructing the system of pri-vate cloud storage based on HDFS is put forward through the study of the technology of private cloud storage and HDFS. Through the ex-periment, the system is featured with high reliability, good scalability, and low cost of developing and running, which meets the needs of the secure, reliable, fast and efficient storage of the vast resources for enterprises.%针对目前企业海量数据存储和管理的问题,本文通过对私有云存储和HDFS技术的研究,提出基于HDFS技术构建企业私有云存储系统。通过实验验证,该系统具有安全可靠性高、扩展性好、开发和运行的成本较低等特点,能够满足企业对海量资源安全可靠、高效快速的存储。

  1. Design of matching model based on APK file grabbing system%基于APK文件抓取系统的匹配模块设计

    Institute of Scientific and Technical Information of China (English)

    高瑞华

    2016-01-01

    This paper proposed a new design method for the APK capture system. The First designed the overall framework of the system using Mysql5.5 to setup the system's database. Based on open source Python web crawler framework Scrapy as well as the characteristics of the market and application of APK, It accomplished the design of fingerprint matching module using Fuzzy Hashing algorithm. uring the design process, VirusTotal and feature matching method were also combined. It discussed function of the matching module and matching algorithm in detail, greatly improved the efficiency of malicious software detection. The new method meet the design requirement and provide a strong support for the future research.%文中提出了一个APK抓取系统的设计思路,首先设计了该系统的整体框架,使用Mysql5.5实现系统的数据库,基于开源python网络爬虫框架Scrapy,结合应用市场及APK的特性,联合使用VirusTotal和特征匹配检测的方法,重点设计了该APK文件抓取系统下基于模糊哈希算法的指纹匹配模块。为降低APK的恶意性,详细论述了匹配模块的功能、匹配算法、主要解决了“如何快速有效的检测恶意软件”的等问题,达到了设计要求。为后续研究提供了有力支撑。

  2. Implementing Journaling in a Linux Shared Disk File System

    Science.gov (United States)

    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.

  3. Cloud Based Log file analysis with Interactive Spark as a Service

    Directory of Open Access Journals (Sweden)

    Nurudeen Sherif

    2016-07-01

    Full Text Available The Software applications are usually programmed to generate some auxiliary text files referred to as log files. Such files are used throughout various stages of the software development, primarily for debugging and identification of errors. Use of log files makes debugging easier during testing. It permits following the logic of the program, at high level, while not having to run it in debug mode. Nowadays, log files are usually used at commercial software installations for the aim of permanent software observation and finetuning. Log files became a typical part of software application and are essential in operating systems, networks and distributed systems. Log files are usually the only way to determine and find errors in a software application, because probe effect has no effect on log file analysis. Log files are usually massive and may have an intricate structure. Though the method of generating log files is sort of easy and simple, log file analysis may well be an incredible task that needs immense computing resources and complex procedures.

  4. 75 FR 26747 - Meadow Lake Wind Farm IV LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2010-05-12

    ...] Meadow Lake Wind Farm IV LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request...-referenced proceeding of Meadow Lake Wind Farm IV LLC's application for market-based rate authority, with an... proceeding are accessible in the Commission's eLibrary system by clicking on the appropriate link in the...

  5. 76 FR 11774 - Paulding Wind Farm II LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2011-03-03

    ... Energy Regulatory Commission Paulding Wind Farm II LLC; Supplemental Notice That Initial Market-Based... above-referenced proceeding of Paulding Wind Farm II LLC's application for market-based rate authority... filings in the above-referenced proceeding are accessible in the Commission's eLibrary system by clicking...

  6. A cloud-based multimodality case file for mobile devices.

    Science.gov (United States)

    Balkman, Jason D; Loehfelm, Thomas W

    2014-01-01

    Recent improvements in Web and mobile technology, along with the widespread use of handheld devices in radiology education, provide unique opportunities for creating scalable, universally accessible, portable image-rich radiology case files. A cloud database and a Web-based application for radiologic images were developed to create a mobile case file with reasonable usability, download performance, and image quality for teaching purposes. A total of 75 radiology cases related to breast, thoracic, gastrointestinal, musculoskeletal, and neuroimaging subspecialties were included in the database. Breast imaging cases are the focus of this article, as they best demonstrate handheld display capabilities across a wide variety of modalities. This case subset also illustrates methods for adapting radiologic content to cloud platforms and mobile devices. Readers will gain practical knowledge about storage and retrieval of cloud-based imaging data, an awareness of techniques used to adapt scrollable and high-resolution imaging content for the Web, and an appreciation for optimizing images for handheld devices. The evaluation of this software demonstrates the feasibility of adapting images from most imaging modalities to mobile devices, even in cases of full-field digital mammograms, where high resolution is required to represent subtle pathologic features. The cloud platform allows cases to be added and modified in real time by using only a standard Web browser with no application-specific software. Challenges remain in developing efficient ways to generate, modify, and upload radiologic and supplementary teaching content to this cloud-based platform. Online supplemental material is available for this article.

  7. 75 FR 3939 - Merit Systems Protection Board (MSPB) Provides Notice of Opportunity To File Amicus Briefs

    Science.gov (United States)

    2010-01-25

    ... From the Federal Register Online via the Government Publishing Office MERIT SYSTEMS PROTECTION BOARD Merit Systems Protection Board (MSPB) Provides Notice of Opportunity To File Amicus Briefs AGENCY..., the Merit Systems Protection Board (MSPB) is providing notice of the opportunity to file amicus...

  8. P2P文件共享系统中的一种基于商品市场模型的访问控制机制%A Kind of Access Control Mechanism Based on Commodity Market in P2P File Sharing System

    Institute of Scientific and Technical Information of China (English)

    李勇军; 代亚非

    2012-01-01

    As Peer-to-peer (P2P) file sharing is increasingly becoming popular as a new paradigm for file exchange> its security has been an issue of concern, and access control is one of the key technologies of system security. However, the decentralized and dynamic characteristic of P2P system makes the traditional access control methods cannot be applied directly, and the existing access control methods for P2P file-sharing system cannot be a good solution to against the large concurrent file-downloading request or bombarded malicious file-downloading requests. To address the above problems, a kind of access control mechanism based on commodity market (ACMCM) in P2P file sharing system is presented in this paper. The market mechanism makes the file-downloading requests in a balanced distribution among the file providers; the price of downloaded file increases in exponential with the number of repeat downloading on same file, so the malicious file downloading is effectively denied; the bandwidth is allocated rationally among the concurrent downloading, and it makes system time used for file-downloading be short as possible. We believe that ACMCM preserves P2P decentralized structure and dynamic property. Finally, the distributed protocol of the major processes is presented.%随着P2P文件共享系统日益成为流行的文件交换方式,其安全问题势必引起关注,而访问控制是P2P系统安全的关键技术之一.由于P2P系统具有分散性和动态性,传统的访问控制机制不能够直接应用于P2P文件共享系统中.而现有针对P2P文件共享系统的访问控制机制不能很好地解决大量并发文件下载请求或者爆发式的恶意文件下载对节点带来的侵害.针对上述问题,文中提出一种基于商品市场模型的访问控制机制(ACMCM),利用市场调节机制使得文件下载请求均衡地分布在多个文件提供者之间;下载文件的价格随着重复下载次数的增加而呈指数增长,有效遏

  9. Application of Distributed File System in Marketing File System%分布式文件系统在营销档案系统中的应用

    Institute of Scientific and Technical Information of China (English)

    方舟; 裴旭斌; 裘炜浩

    2015-01-01

    The marketing file system of Zhejiang (Provincial) Electric Power Company now is fully applied in the whole province. The fast growth of file data brings stricter requirements on storage of electronic files and other nonstructural data. By investigating features of distributed file system and taking the application of MooseFS distributed file system in marketing file system as an example, it is verified that the distributed file system is superior to the concentrated storage in terms of load balance, online capacity expansion and so on. The application of distributed file system provides a feasible solution to massive data storage of marketing file system.%目前,浙江省电力公司在全省范围内使用营销档案系统,档案数据的快速增长,对电子档案文件等非结构化数据的存储有了更高的要求。通过对分布式文件系统的特性进行研究,并以MooseFS分布式文件系统在营销档案系统的实际应用为例,验证了分布式文件系统相比于传统集中存储方式在负载均衡和在线扩容等方面的优势。分布式文件系统的应用为营销档案系统海量数据的存储提供了一种可行的解决方案。

  10. Uncoupling File System Components for Bridging Legacy and Modern Storage Architectures

    Science.gov (United States)

    Golpayegani, N.; Halem, M.; Tilmes, C.; Prathapan, S.; Earp, D. N.; Ashkar, J. S.

    2016-12-01

    Long running Earth Science projects can span decades of architectural changes in both processing and storage environments. As storage architecture designs change over decades such projects need to adjust their tools, systems, and expertise to properly integrate such new technologies with their legacy systems. Traditional file systems lack the necessary support to accommodate such hybrid storage infrastructure resulting in more complex tool development to encompass all possible storage architectures used for the project. The MODIS Adaptive Processing System (MODAPS) and the Level 1 and Atmospheres Archive and Distribution System (LAADS) is an example of a project spanning several decades which has evolved into a hybrid storage architecture. MODAPS/LAADS has developed the Lightweight Virtual File System (LVFS) which ensures a seamless integration of all the different storage architectures, including standard block based POSIX compliant storage disks, to object based architectures such as the S3 compliant HGST Active Archive System, and the Seagate Kinetic disks utilizing the Kinetic Protocol. With LVFS, all analysis and processing tools used for the project continue to function unmodified regardless of the underlying storage architecture enabling MODAPS/LAADS to easily integrate any new storage architecture without the costly need to modify existing tools to utilize such new systems. Most file systems are designed as a single application responsible for using metadata to organizing the data into a tree, determine the location for data storage, and a method of data retrieval. We will show how LVFS' unique approach of treating these components in a loosely coupled fashion enables it to merge different storage architectures into a single uniform storage system which bridges the underlying hybrid architecture.

  11. Search Method Based on Figurative Indexation of Folksonomic Features of Graphic Files

    Directory of Open Access Journals (Sweden)

    Oleg V. Bisikalo

    2013-11-01

    Full Text Available In this paper the search method based on usage of figurative indexation of folksonomic characteristics of graphical files is described. The method takes into account extralinguistic information, is based on using a model of figurative thinking of humans. The paper displays the creation of a method of searching image files based on their formal, including folksonomical clues.

  12. Design and implementation of network file storage management system based on .NET%基于NET的网络文件存储管理系统设计与实现

    Institute of Scientific and Technical Information of China (English)

    张艳

    2014-01-01

    With the development of network technology,the network file storage system is increasingly popularizing. Taking the Microsoft Visual Studio 2008 as the integrated development environment,a relatively complete network file storage manage-ment system was designed and implemented to achieve the network resource sharing and improve the resource utilization by the aid of the SQL Server 2005 database software,in which ASP.NET technology,ASP.NET 2.0 and C# development language were used. Some functions,such as user login,folder management and file management were achieved in the system by utilizing B/S mode structure. It provided a convenient and efficient means of resource exchange for network file management. It has a certain practical value.%随着网络技术的发展,网络文件存储系统日益普及。为了实现网络资源共享,提高资源利用率,通过ASP.NET技术,采用ASP.NET 2.0和C#开发语言,以Microsoft Visual Studio 2008作为集成开发环境,结合SQL Server 2005数据库软件,设计实现了一个相对完善的网络文件存储管理系统。系统利用B/S模式结构,实现了用户登录、文件夹管理以及文件管理等功能,为网络文件管理提供了高效便捷的资源交换手段,具有一定的实用价值。

  13. Experience on QA in the CernVM File System

    CERN Document Server

    CERN. Geneva; MEUSEL, Rene

    2015-01-01

    The CernVM-File System (CVMFS) delivers experiment software installations to thousands of globally distributed nodes in the WLCG and beyond. In recent years it became a mission-critical component for offline data processing of the LHC experiments and many other collaborations. From a software engineering perspective, CVMFS is a medium-sized C++ system-level project. Following the growth of the project, we introduced a number of measures to improve the code quality, testability, and maintainability. In particular, we found very useful code reviews through github pull requests and automated unit- and integration testing. We are also transitioning to a test-driven development for new features and bug fixes. These processes are supported by a number of tools, such as Google Test, Jenkins, Docker, and others. We would like to share our experience on problems we encountered and on which processes and tools worked well for us.

  14. Nodal aberration theory for wild-filed asymmetric optical systems

    Science.gov (United States)

    Chen, Yang; Cheng, Xuemin; Hao, Qun

    2016-10-01

    Nodal Aberration Theory (NAT) was used to calculate the zero field position in Full Field Display (FFD) for the given aberration term. Aiming at wide-filed non-rotational symmetric decentered optical systems, we have presented the nodal geography behavior of the family of third-order and fifth-order aberrations. Meanwhile, we have calculated the wavefront aberration expressions when one optical element in the system is tilted, which was not at the entrance pupil. By using a three-piece-cellphone lens example in optical design software CodeV, the nodal geography is testified under several situations; and the wavefront aberrations are calculated when the optical element is tilted. The properties of the nodal aberrations are analyzed by using Fringe Zernike coefficients, which are directly related with the wavefront aberration terms and usually obtained by real ray trace and wavefront surface fitting.

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

    CERN Document Server

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

    2010-01-01

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

  16. Discourage free riding in Peer-to-Peer file sharing systems with file migration and workload balancing approach

    Institute of Scientific and Technical Information of China (English)

    YU Yijiao; JIN Hai

    2007-01-01

    Free riding is a great challenge to the development and maintenance of Peer-to-Peer(P2P)networks.A file migration and workload balancing based approach (FMWBBA)to discourage free riding is proposed in this paper.The heart of our mechanism is to migrate some shared files from the overloaded peers to the neighboring free riders automatically and transparently,which enforces free riders to offer services when altruistic peers are heavily overloaded.File migration is a key issue in our approach,and some related strategies are discussed.A simulation is designed to verify this approach,and the results show that it can not only alleviate free riding,but also improve the Quality of Service(QoS)and robustness of P2P networks efficiently.

  17. Utilizing Lustre file system with dCache for CMS analysis

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Y; Kim, B; Fu, Y; Bourilkov, D; Avery, P [Department of Physics, University of Florida, Gainesville, FL 32611 (United States); Rodriguez, J L [Department of Physics, Florida International University, Miami, FL 33199 (United States)

    2010-04-01

    This paper presents storage implementations that utilize the Lustre file system for CMS analysis with direct POSIX file access while keeping dCache as the frontend for data distribution and management. We describe two implementations that integrate dCache with Lustre and how to enable user data access without going through the dCache file read protocol. Our initial CMS analysis job measurement and transfer performance results are shown and the advantages of different implementations are briefly discussed.

  18. Analyzing Log Files to Predict Students' Problem Solving Performance in a Computer-Based Physics Tutor

    Science.gov (United States)

    Lee, Young-Jin

    2015-01-01

    This study investigates whether information saved in the log files of a computer-based tutor can be used to predict the problem solving performance of students. The log files of a computer-based physics tutoring environment called Andes Physics Tutor was analyzed to build a logistic regression model that predicted success and failure of students'…

  19. Establishing a Web-Based DICOM Teaching File Authoring Tool Using Open-Source Public Software

    OpenAIRE

    Lee, Wen-Jeng; Yang, Chung-Yi; Liu, Kao-Lang; Liu, Hon-Man; Ching, Yu-Tai; Chen, Shyh-Jye

    2005-01-01

    Online teaching files are an important source of educational and referential materials in the radiology community. The commonly used Digital Imaging and Communications in Medicine (DICOM) file format of the radiology community is not natively supported by common Web browsers. The ability of the Web server to convert and parse DICOM is important when the DICOM-converting tools are not available. In this paper, we describe our approach to develop a Web-based teaching file authoring tool. Our se...

  20. A Study of Anti-leak System based on File Protection%一种基于文件保护的防泄密系统研究

    Institute of Scientific and Technical Information of China (English)

    刘思超; 张梓雄; 韩惠良; 孙国梓

    2013-01-01

    This article has carried on the analysis regarding the data security problem in the system, from the ifle protection perspective provides a solution, the design and implementation of a practical LAN ifle security control system, which realize the administrator can control only in a security system that a trusted host for editing and conifdential documents, to protect the stronger ability to prevent conifdential documents or data leaked. A trusted host security technology as well as the transparent encryption driver, the control end, the system administrator is analyzed.%文章对于系统中的数据安全问题进行了分析,从文件保护的角度提供了一种解决方案,设计与实现了一个具有实用性的局域网内文件安全管控系统,即实现管理员可以控制的仅能够在指定的受信主机上进行机密文件的编辑与修改的安全系统,达到更强的防止机密文件或者数据被泄露的保护能力。文章还对系统中的管理员控制端、受信主机安全技术以及透明加解密驱动程序等进行了分析。

  1. 76 FR 57731 - Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section...

    Science.gov (United States)

    2011-09-16

    ... Request for Blanket Section 204 Authorization; Rockland Wind Farm, LLC This is a supplemental notice in the above-referenced proceeding of Rockland Wind Farm, LLC's application for market-based rate... filings in the above-referenced proceeding are accessible in the Commission's eLibrary system by clicking...

  2. The Design and Realization of Test Files Uploading System%考试文件上传系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    李太凤

    2014-01-01

    计算机的考试会有大量的考试文件需要提交。考试文件上传系统通过HTML表单获取学生提交文件的信息,使用ASP无组件上传类将文件上传到服务器上,并进行文件重命名等操作,实现对考试文件的统一管理。利用相应的编程方法和技巧,设计出符合实际需求的各种考试文件上传系统,可改变传统提交考试文件的方式,减轻教师负担,提高工作效率。%A large quantity of exam files need to be uploaded during computer-based testing. The exam files uploading system changes the traditional way of submitting exam files, lightens teachers’work load, and increases efficiency. The system realizes the unified management of the exam files by such procedures as acquiring the files submitted by students through HTML form, uploading the files to servers by ASP non-component upload, renaming the files, etc. It is possible to design the system of uploading exam files by comprehensively using all kinds of programming methods and skills.

  3. Environmental Fate Data Base (ENVIROFATE): data pointer file (DATALOG), February 1987. Data file

    Energy Technology Data Exchange (ETDEWEB)

    Boethling, R.

    1987-02-01

    DATALOG is a bibliographic pointer file of environmental fate data and each record contains a chemical CAS registry number (9 bytes), one of 18 data types (9 bytes), and a reference number (6 bytes) to the full citation in the XREF file. The data types identify physical properties, degradation and transport studies, and food, occupational and ambient monitoring data. The file should be used with CASLST (in order to link the chemical name and formula) and XREF (in order to link the full reference citation). A list of possible data types and their abbreviations are: Adsorption (ADSORP), Bioconcentration (BIOCON), Biodegradation (BIODEG), Dissociation constant (DISS CON), Ecosystem (ECOS), Effluent concentrations (EFFL), Evaporation from water (EVAP), Food and crop concentrations (FOOD), Field studies (FIELD), Henry's Law constant (HENRY CON), Hydrolysis (HYDROL), Monitoring (MONIT), Occupational concentrations (OCCUP), Octanol/water partition coefficient (O/W PART), Photoxidation (PHOTOOXID), UV Spectra (UV), Vapor pressure (UP) and Water solubility (WATER SOL).

  4. Secure File Allocation and Caching in Large-scale Distributed Systems

    DEFF Research Database (Denmark)

    Di Mauro, Alessio; Mei, Alessandro; Jajodia, Sushil

    2012-01-01

    In this paper, we present a file allocation and caching scheme that guarantees high assurance, availability, and load balancing in a large-scale distributed file system that can support dynamic updates of authorization policies. The scheme uses fragmentation and replication to store files with hi......-balancing, and reducing delay of read operations. The system offers a trade-off-between performance and security that is dynamically tunable according to the current level of threat. We validate our mechanisms with extensive simulations in an Internet-like network....... security requirements in a system composed of a majority of low-security servers. We develop mechanisms to fragment files, to allocate them into multiple servers, and to cache them as close as possible to their readers while preserving the security requirement of the files, providing load...

  5. A Newer User Authentication, File encryption and Distributed Server Based Cloud Computing security architecture

    Directory of Open Access Journals (Sweden)

    Kawser Wazed Nafi

    2012-10-01

    Full Text Available The cloud computing platform gives people the opportunity for sharing resources, services and information among the people of the whole world. In private cloud system, information is shared among the persons who are in that cloud. For this, security or personal information hiding process hampers. In this paper we have proposed new security architecture for cloud computing platform. This ensures secure communication system and hiding information from others. AES based file encryption system and asynchronous key system for exchanging information or data is included in this model. This structure can be easily applied with main cloud computing features, e.g. PaaS, SaaS and IaaS. This model also includes onetime password system for user authentication process. Our work mainly deals with the security system of the whole cloud computing platform.

  6. 76 FR 43206 - Electronic Tariff Filing System (ETFS)

    Science.gov (United States)

    2011-07-20

    ... public reviewing the tariff by including some descriptive information on the Title page of the tariff... nondominant carriers to research their previously filed tariff revisions to include different transmittal... by revising paragraphs (b) and (e) to read as follows: Sec. 61.14 Method of filing...

  7. 76 FR 6128 - Energy Exchange International, LLC; Supplemental Notice That Initial Market-Based Rate Filing...

    Science.gov (United States)

    2011-02-03

    ...-000] Energy Exchange International, LLC; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding Energy Exchange International, LLC's application for market-based rate...

  8. File sharing

    NARCIS (Netherlands)

    van Eijk, N.

    2011-01-01

    File sharing’ has become generally accepted on the Internet. Users share files for downloading music, films, games, software etc. In this note, we have a closer look at the definition of file sharing, the legal and policy-based context as well as enforcement issues. The economic and cultural impact

  9. Always-optimally-coordinated candidate selection algorithm for peer-to-peer files sharing system in mobile self-organized networks

    Institute of Scientific and Technical Information of China (English)

    Li Xi; Ji Hong; Zheng Ruiming; Li Ting

    2009-01-01

    In order to improve the performance of peer-to-peer files sharing system under mobile distributed environments, a novel always-optimally-coordinated (AOC) criterion and corresponding candidate selection algorithm are proposed in this paper. Compared with the traditional min-hops criterion, the new approach introduces a fuzzy knowledge combination theory to investigate several important factors that influence files transfer success rate and efficiency. Whereas the min-hops based protocols only ask the nearest candidate peer for desired files, the selection algorithm based on AOC comprehensively considers users' preference and network requirements with flexible balancing rules. Furthermore, its advantage also expresses in the independence of specified resource discovering protocols, allowing for scalability. The simulation results show that when using the AOC based peer selection algorithm, system performance is much better than the min-hops scheme, with files successful transfer rate improved more than 50% and transfer time reduced at least 20%.

  10. 基于 Windows 平行文件系统下的平行 I/O%Paral el I/O Windows Paral el File System Based on

    Institute of Scientific and Technical Information of China (English)

    张驰

    2014-01-01

    近年来,平行档案系统被广泛的用来解决这个问题,除此之外,由于电脑被使用于平行处理平台的普及率逐步上升,造成使用于电脑上的平行处理软体需求量持续增加,但是,却有可能缺乏平行 I/O 的系统。因此,文章旨在研究与分析 Windows 平行文件系统下的平行 I/O 的特点与实现方式。%In recent years, paral el file system is widely used to solve this problem in,Addition, because the computer is used in popular paral el processing platform rate toriseGradual y resulting in the use of, paral el processing in computer software demandcontinuesTo increase, but there is the possibility of system lack of paral el I/O.Therefore,characteristicAnd realizing methods of this article is for the purpose ofparal el I/O research andanalysis ofWindows paral el file systm.

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

    Energy Technology Data Exchange (ETDEWEB)

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

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

    Science.gov (United States)

    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.

  13. Design and Implementation of Two-Level Metadata Server in Small-Scale Cluster File System

    Institute of Scientific and Technical Information of China (English)

    LIU Yuling; YU Hongfen; SONG Weiwei

    2006-01-01

    The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system (TTMFS) is presented, which behaves high reliability and performance. The merits both centralized management and distributed management are considered simultaneously in our design. In this file system, the advanced-metadata server is responsible for manage directory metadata and the whole namespace. The double-metadata server is responsible for maintaining file metadata. And this paper uses the Markov return model to analyze the reliability of the two-level metadata server. The experiment data indicates that the design can provide high throughput.

  14. RRB's SVES Input File - Post Entitlement State Verification and Exchange System (PSSVES)

    Data.gov (United States)

    Social Security Administration — Several PSSVES request files are transmitted to SSA each year for processing in the State Verification and Exchange System (SVES). This is a first step in obtaining...

  15. MASS SMALL-FILE STORAGE FILE SYSTEM RESEARCH OVERVIEW%海量小文件存储文件系统研究综述

    Institute of Scientific and Technical Information of China (English)

    王铃惠; 李小勇; 张轶彬

    2012-01-01

    With the development of Internet, the small file storage size shows a geometric growth too. Therefore traditional file systems no longer meet the requirements for storage performance. For small file storage, especially mass small-file storage, optimization is becoming more and more important. The paper first of all explains the necessity for small file storage system optimization; then analyzes problems existing in present small file storage and expounds optimization approaches. Afterward it introduces three representative file systems for small file storage. In the end there is a summary.%随着互联网的发展,存储的小文件数量也呈几何级的增长.传统文件系统已不能满足存储性能的需求,对于小文件存储,尤其是海量小文件存储的优化已变得越来越重要.首先提出对小文件存储的系统进行优化的必要性,然后对小文件存储中存在的问题进行分析并阐述优化的方式,并介绍三种具有代表性的适合小文件存储的文件系统,最后总结归纳.

  16. CMAQv5.1 Base NEIv1 AQS hourly site compare files

    Data.gov (United States)

    U.S. Environmental Protection Agency — CMAQv5.1 Base NEIv1 AQS hourly sitex files containing hourly paired model/ob data for the AQS network. This dataset is associated with the following publication:...

  17. Research on Storage of Hadoop Distributed Small File System%基于Hadoop的小文件分布式存储技术研究

    Institute of Scientific and Technical Information of China (English)

    袁晓春

    2014-01-01

    HDFS (Hadoop Distributed File System)以其高容错性、高伸缩性等优点,允许用户将Hadoop部署在低廉的硬件上,广泛适用于大文件存储。然而对于海量小文件,因为内存开销过高,因此对数据的存储技术提出了更高的要求。基于Hadoop分布式文件系统(HDFS)架构,研究小文件在Hadoop架构下的数据处理策略,通过实验将其与传统的文件系统的读写、计算速度进行比较。%HDFS (Hadoop Distributed File System) for its high fault tolerance, high scalability, etc., allows the user to deploy Hadoop inexpensive hardware, is widely used in large file storage. However, for the mass of small files, because the memory overhead is too high, so the data storage technology put forward higher requirements. Based on Hadoop distributed file system (HDFS) architecture, small file data processing policy in the Hadoop framework, by comparing the read and write test with the traditional file system, the calculation speed.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  19. Noise Reduction in Breath Sound Files Using Wavelet Transform Based Filter

    Science.gov (United States)

    Syahputra, M. F.; Situmeang, S. I. G.; Rahmat, R. F.; Budiarto, R.

    2017-04-01

    The development of science and technology in the field of healthcare increasingly provides convenience in diagnosing respiratory system problem. Recording the breath sounds is one example of these developments. Breath sounds are recorded using a digital stethoscope, and then stored in a file with sound format. This breath sounds will be analyzed by health practitioners to diagnose the symptoms of disease or illness. However, the breath sounds is not free from interference signals. Therefore, noise filter or signal interference reduction system is required so that breath sounds component which contains information signal can be clarified. In this study, we designed a filter called a wavelet transform based filter. The filter that is designed in this study is using Daubechies wavelet with four wavelet transform coefficients. Based on the testing of the ten types of breath sounds data, the data is obtained in the largest SNRdB bronchial for 74.3685 decibels.

  20. Microprocessor based systems for the higher technician

    CERN Document Server

    Vears, RE

    2013-01-01

    Microprocessor Based Systems for the Higher Technician provides coverage of the BTEC level 4 unit in Microprocessor Based Systems (syllabus U80/674). This book is composed of 10 chapters and concentrates on the development of 8-bit microcontrollers specifically constructed around the Z80 microprocessor. The design cycle for the development of such a microprocessor based system and the use of a disk-based development system (MDS) as an aid to design are both described in detail. The book deals with the Control Program Monitor (CP/M) operating system and gives background information on file hand

  1. In vitro comparison rate of dental root canal transportation using two single file systems on the simulated resin blocks

    Directory of Open Access Journals (Sweden)

    Mohammad Javad Etesami

    2016-07-01

    Full Text Available Background and Aims: Cleaning and shaping is one of the most important stages in endodontic treatment. Single-file systems save time and reduce the risk of transmission of pathogens. This in vitro study was aimed to compare the rate of canal transportation after the preparation of the stimulated resin root canal with two single-file systems, namely Waveone and Reciproc. Materials and Methods: Thirty stimulated resin root canal blocks with size 8/0. 02 K file were randomly divided into two study groups. The preparation in Group A and Group B was performed using Reciproc and Waveone files, respectively. Pre and post- preparation photographs were taken and the images were superimposed to evaluate the inner and outer wall’s curvature tendency at three points (apical, middle and coronal using AutoCad pragram. Data were analyzed using T-test. Results: Based on the results, the degree of transportation in the inner and outer walls of the canal was less at the level of 3 millimeters (P0.05. Conclusion: Waveone showed better performance in the middle third of canal and this system maybe recommended.

  2. 嵌入式Linux文件系统的构建和移植%Design and Portability of Embedded Linux File System

    Institute of Scientific and Technical Information of China (English)

    王小妮

    2015-01-01

    An important part of construction root file system of embedded Linux system is built based on S3C6410 processor. Parts of the root file system and file types are introduced. A basic root file system is built using the Busybox toolbox. A method of fast transplant of file system is introduced, providing a reference for file system transplant on other processors.%在S3C6410处理器上构建嵌入式Linux系统的重要组成部分根文件系统。分析了根文件系统的组成部分,并对文件类型进行了介绍。利用Busybox工具集构建一个基本的文件系统,并介绍了快速移植文件系统的方法,为其他处理器上文件系统的移植提供参考。

  3. Modeling of the interplay between single-file diffusion and conversion reaction in mesoporous systems

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Jing [Iowa State Univ., Ames, IA (United States)

    2013-01-11

    We analyze the spatiotemporal behavior of species concentrations in a diffusion-mediated conversion reaction which occurs at catalytic sites within linear pores of nanometer diameter. A strict single-file (no passing) constraint occurs in the diffusion within such narrow pores. Both transient and steady-state behavior is precisely characterized by kinetic Monte Carlo simulations of a spatially discrete lattice–gas model for this reaction–diffusion process considering various distributions of catalytic sites. Exact hierarchical master equations can also be developed for this model. Their analysis, after application of mean-field type truncation approximations, produces discrete reaction–diffusion type equations (mf-RDE). For slowly varying concentrations, we further develop coarse-grained continuum hydrodynamic reaction–diffusion equations (h-RDE) incorporating a precise treatment of single-file diffusion (SFD) in this multispecies system. Noting the shortcomings of mf-RDE and h-RDE, we then develop a generalized hydrodynamic (GH) formulation of appropriate gh-RDE which incorporates an unconventional description of chemical diffusion in mixed-component quasi-single-file systems based on a refined picture of tracer diffusion for finite-length pores. The gh-RDE elucidate the non-exponential decay of the steady-state reactant concentration into the pore and the non-mean-field scaling of the reactant penetration depth. Then an extended model of a catalytic conversion reaction within a functionalized nanoporous material is developed to assess the effect of varying the reaction product – pore interior interaction from attractive to repulsive. The analysis is performed utilizing the generalized hydrodynamic formulation of the reaction-diffusion equations which can reliably capture the complex interplay between reaction and restricted transport for both irreversible and reversible reactions.

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

    Science.gov (United States)

    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.

  5. LHCB: Non-POSIX File System for the LHCB Online Event Handling

    CERN Multimedia

    Garnier, J-C; Cherukuwada, S S

    2010-01-01

    LHCb aims to use its O(20000) CPU cores in the High Level Trigger (HLT) and its 120 TB Online storage system for data reprocessing during LHC shutdown periods. These periods can last between a few days and several weeks during the winter shutdown or even only a few hours during beam interfill gaps. These jobs run on files which are staged in from tape storage to the local storage buffer. The result are again one or more files. Efficient file writing and reading is essential for the performance of the system. Rather than using a traditional shared filesystem such as NFS or CIFS we have implemented a custom, light-weight, non-Posix file-system for the handling of these files. Streaming this filesystem for the data-access allows to obtain high performance, while at the same time keep the resource consumption low and add nice features not found in NFS such as high-availability, transparent failover of the read and write service. The writing part of this file-system is in successful use for the Online, real-time w...

  6. Distributed Seismic Data File System%分布式地震数据文件系统

    Institute of Scientific and Technical Information of China (English)

    刘永江; 邵庆; 彭淑罗

    2015-01-01

    在地震资料处理系统中,对TB级的海量地震数据文件的存取存在严重的I/O瓶颈.针对地震数据文件操作的特点,提出了一个基于集群环境的分布式地震数据文件系统(DSFS).该系统由数据库节点、地震数据文件节点、计算节点组成.设计了面向地震道集数据的分布式文件架构,该架构以地震道头信息索引数据库为中心,将一个大的地震数据文件分解为多个可独立操作的子文件,建立基于道头字的索引数据表,根据索引表可快速定位道数据所在的子文件及数据块.设计了一组DSFS文件操作和道集数据读写操作,提供了针对虚拟文件按道头字值进行数据查询和输入输出,屏蔽了分布式文件的细节,并提出了文件分布及并行存取策略.DSFS在地震资料处理系统得到应用并具有很高的数据存取效率.%The serious I/O bottleneck was found in seismic data process system to access large seismic data file which size reaches TB grade. Aiming at the futures of accessing seismic data files,a distributed seismic data file system (DSFS) based on cluster computer is put forward,that is composed of database node,seismic data file node and computing node. A distributed file architecture facing seismic gath-er is designed,taking seismic trace indexing database as the center,spliting a large seismic data file into sub files that can be access seis-mic data separately,a seismic trace indexing table is designed to locate the sub file and data block that a trace data is stored. A set of oper-ators on DSFS file and accessing gather data are designed,providing the data query and input and output data by trace key values in large file,the distributed file details is screened. The strategy for distributed file and parallel I/O is presented. The DSFS has been used in seis-mic data process system,and has very high I/O efficiency.

  7. Virtual file system on NoSQL for processing high volumes of HL7 messages.

    Science.gov (United States)

    Kimura, Eizen; Ishihara, Ken

    2015-01-01

    The Standardized Structured Medical Information Exchange (SS-MIX) is intended to be the standard repository for HL7 messages that depend on a local file system. However, its scalability is limited. We implemented a virtual file system using NoSQL to incorporate modern computing technology into SS-MIX and allow the system to integrate local patient IDs from different healthcare systems into a universal system. We discuss its implementation using the database MongoDB and describe its performance in a case study.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2003-04-07

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

  9. Effect of Instrumentation Length and Instrumentation Systems: Hand Versus Rotary Files on Apical Crack Formation – An In vitro Study

    Science.gov (United States)

    Mahesh, MC; Bhandary, Shreetha

    2017-01-01

    Introduction Stresses generated during root canal instrumentation have been reported to cause apical cracks. The smaller, less pronounced defects like cracks can later propagate into vertical root fracture, when the tooth is subjected to repeated stresses from endodontic or restorative procedures. Aim This study evaluated occurrence of apical cracks with stainless steel hand files, rotary NiTi RaCe and K3 files at two different instrumentation lengths. Materials and Methods In the present in vitro study, 60 mandibular premolars were mounted in resin blocks with simulated periodontal ligament. Apical 3 mm of the root surfaces were exposed and stained using India ink. Preoperative images of root apices were obtained at 100x using stereomicroscope. The teeth were divided into six groups of 10 each. First two groups were instrumented with stainless steel files, next two groups with rotary NiTi RaCe files and the last two groups with rotary NiTi K3 files. The instrumentation was carried out till the apical foramen (Working Length-WL) and 1 mm short of the apical foramen (WL-1) with each file system. After root canal instrumentation, postoperative images of root apices were obtained. Preoperative and postoperative images were compared and the occurrence of cracks was recorded. Descriptive statistical analysis and Chi-square tests were used to analyze the results. Results Apical root cracks were seen in 30%, 35% and 20% of teeth instrumented with K-files, RaCe files and K3 files respectively. There was no statistical significance among three instrumentation systems in the formation of apical cracks (p=0.563). Apical cracks were seen in 40% and 20% of teeth instrumented with K-files; 60% and 10% of teeth with RaCe files and 40% and 0% of teeth with K3 files at WL and WL-1 respectively. For groups instrumented with hand files there was no statistical significance in number of cracks at WL and WL-1 (p=0.628). But for teeth instrumented with RaCe files and K3 files

  10. Polluted File Detection Method in P2P File-sharing System%P2P文件分享系统中污染文件检测方法

    Institute of Scientific and Technical Information of China (English)

    黄智勇; 石幸利; 周喜川; 陈新龙

    2012-01-01

    针对P2P文件分享系统中污染文件的传播检测问题,在声誉度检测机制的基础上,提出一种基于接触跟踪树的检测方法.通过跟踪文件的传播路径,利用相关节点的声誉度建立接触跟踪树,对接触跟踪树的拓扑结构进行分析,获取传播文件为污染文件的概率值,从而实现对污染文件的检测.实验结果表明,该方法能有效提高检测精度,减小系统误报率.%Aiming at the problem of detecting the polluted files in file-sharing system, this paper proposes a detection method based on contact tracing tree and reputation mechanism. It establishes contact tracing trees by tracking the propagation of files in the file-sharing system, and confirms the polluted files by analyzing the topology of contact tracing trees. Experimental results show that the method can effectively improve the detection accuracy, and reduce the rate of false alarm.

  11. 76 FR 4001 - Foreign Trade Regulations (FTR): Mandatory Automated Export System Filing for All Shipments...

    Science.gov (United States)

    2011-01-21

    ... Commerce Census Bureau 15 CFR Part 30 Foreign Trade Regulations (FTR): Mandatory Automated Export System... Foreign Trade Regulations (FTR): Mandatory Automated Export System Filing for All Shipments Requiring... Automated Export System (AES) or through AESDirect for all shipments of used self-propelled...

  12. Electronic teaching files: seven-year experience using a commercial picture archiving and communication system.

    Science.gov (United States)

    Siegel, E; Reiner, B

    2001-06-01

    With the advent of electronic imaging and the internet, the ability to create, search, access, and archive digital imaging teaching files has dramatically improved. Despite the fact that a picture archival and communication system (PACS) has the potential to greatly simplify the creation of, archival, and access to a department or multifacility teaching file, this potential has not yet been satisfactorily realized in our own and most other PACS installations. Several limitations of the teaching file tools within our PACS have become apparent over time. These have, at our facility, resulted in a substantially reduced role of the teaching file tools for conferences, daily teaching, and research purposes. With the PACS at our institution, academic folders can only be created by the systems engineer, which often serves as an impediment to the teaching process. Once these folders are created, multiple steps are required to identify the appropriate folders, and subsequently save images. Difficulties exist for those attempting to search for the teaching file images. Without pre-existing knowledge of the folder name and contents, it is difficult to query the system for specific images. This is due to the fact that there is currently no fully satisfactory mechanism for categorizing, indexing, and searching cases using the PACS. There is currently no easy mechanism to save teaching, research, or clinical files onto a CD or other removable media or to automatically strip demographic or other patient information from the images. PACS vendors should provide much more sophisticated tools to create and annotate teaching file images in an easy to use but standard format (possibly Radiological Society of North America's Medical Image Resource Center [MIRC] format) that could be exchanged with other sites and other vendors' PAC systems. The privilege to create teaching or conference files should be given to the individual radiologists, technologists, and other users, and an audit

  13. 基于DXF文件的数控车削编程系统零件信息输入技术研究%Technology of part information input for NC turning programming system based on DXF files

    Institute of Scientific and Technical Information of China (English)

    孙燕华; 张臣; 周来水

    2011-01-01

    在数控车削编程系统的开发中,直接从CAD图形库中提取零件的几何信息和工艺信息,是获取车削零件信息的一种方式,对于数控车削自动编程系统的实现具有重要意义.结合企业实际需求,通过分析DXF的文件结构,提出了DXF文件解析方法,利用Visual C++6.0从DXF文件中提取直线、圆弧、样条曲线等车削零件的图元轮廓信息,并将所读取的各图元信息保存于设置好的链表结构中,为车削零件的刀具轨迹的生成做好准备.应用实例表明所提出的方法能正确获得车削零件信息,能满足数控车削编程系统对零件信息输入的要求.%Extracting geometric and process information of parts directly from CAD graphics library is a way of obtaining information for turning parts and has great significance in the development and realization of NC turning automatic programming system. The analytical method of DXF files is proposed to extract contour information of turning parts such as line ,arc ,spline curve by analyzing DXF file structure according to the actual enterprise requirements. The extracting contour information is stored in the list structure using Visual C + +6.0 and is ready for generating of tool path of turning parts.A practical examaple shows that the proposed method can get the right turning parts information which can satisfy the requirements for inputting turning parts information to the NC turning automatic programming system.

  14. Tables of file names, times, and locations of images collected during unmanned aerial systems (UAS) flights over Coast Guard Beach, Nauset Spit, Nauset Inlet, and Nauset Marsh, Cape Cod National Seashore, Eastham, Massachusetts on 1 March 2016 (text files)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — These text files contain tables of the file names, times, and locations of images obtained from an unmanned aerial systems (UAS) flown in the Cape Cod National...

  15. Tables of file names, times, and locations of images collected during unmanned aerial systems (UAS) flights over Coast Guard Beach, Nauset Spit, Nauset Inlet, and Nauset Marsh, Cape Cod National Seashore, Eastham, Massachusetts on 1 March 2016 (text files)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — These text files contain tables of the file names, times, and locations of images obtained from an unmanned aerial systems (UAS) flown in the Cape Cod National...

  16. Sandia equation of state data base: seslan File

    Energy Technology Data Exchange (ETDEWEB)

    Kerley, G.I. [Sandia National Labs., Albuquerque, NM (US); Christian-Frear, T.L. [RE/SPEC Inc., Albuquerque, NM (US)

    1993-06-24

    Sandia National Laboratories maintains several libraries of equation of state tables, in a modified Sesame format, for use in hydrocode calculations and other applications. This report discusses one of those libraries, the seslan file, which contains 78 tables from the Los Alamos equation of state library. Minor changes have been made to these tables, making them more convenient for code users and reducing numerical difficulties that occasionally arise in hydrocode calculations.

  17. An asynchronous writing method for restart files in the gysela code in prevision of exascale systems*

    Directory of Open Access Journals (Sweden)

    Thomine O.

    2013-12-01

    Full Text Available The present work deals with an optimization procedure developed in the full-f global GYrokinetic SEmi-LAgrangian code (GYSELA. Optimizing the writing of the restart files is necessary to reduce the computing impact of crashes. These files require a very large memory space, and particularly so for very large mesh sizes. The limited bandwidth of the data pipe between the comput- ing nodes and the storage system induces a non-scalable part in the GYSELA code, which increases with the mesh size. Indeed the transfer time of RAM to data depends linearly on the files size. The necessity of non synchronized writing-in-file procedure is therefore crucial. A new GYSELA module has been developed. This asynchronous procedure allows the frequent writ- ing of the restart files, whilst preventing a severe slowing down due to the limited writing bandwidth. This method has been improved to generate a checksum control of the restart files, and automatically rerun the code in case of a crash for any cause.

  18. FragIt: A Tool to Prepare Input Files for Fragment Based Quantum Chemical Calculations

    CERN Document Server

    Steinmann, Casper; Hansen, Anne S; Jensen, Jan H

    2012-01-01

    Near linear scaling fragment based quantum chemical calculations are becoming increasingly popular for treating large systems with high accuracy and is an active field of research. However, it remains difficult to set up these calculations without expert knowledge. To facilitate the use of such methods, software tools need to be available for support, setup and lower the barrier of entry for usage by non-experts. We present a fragmentation methodology and accompanying tools called FragIt to help setup these calculations. It uses the SMARTS language to find chemically appropriate substructures in structures and is used to prepare input files for the fragment molecular orbital method in the GAMESS program package. We present patterns of fragmentation for proteins and polysaccharides, specifically D-galactopyranose for use in cyclodextrins.

  19. Performance-Centric Optimization for Racetrack Memory Based Register File on GPUs

    Institute of Scientific and Technical Information of China (English)

    Yun Liang; Shuo Wang

    2016-01-01

    The key to high performance for GPU architecture lies in its massive threading capability to drive a large number of cores and enable execution overlapping among threads. However, in reality, the number of threads that can simultaneously execute is often limited by the size of the register file on GPUs. The traditional SRAM-based register file takes up so large amount of chip area that it cannot scale to meet the increasing demand of GPU applications. Racetrack memory (RM) is a promising technology for designing large capacity register file on GPUs due to its high data storage density. However, without careful deployment of RM-based register file, the lengthy shift operations of RM may hurt the performance. In this paper, we explore RM for designing high-performance register file for GPU architecture. High storage density RM helps to improve the thread level parallelism (TLP), but if the bits of the registers are not aligned to the ports, shift operations are required to move the bits to the access ports before they are accessed, and thus the read/write operations are delayed. We develop an optimization framework for RM-based register file on GPUs, which employs three different optimization techniques at the application, compilation, and architecture level, respectively. More clearly, we optimize the TLP at the application level, design a register mapping algorithm at the compilation level, and design a preshifting mechanism at the architecture level. Collectively, these optimizations help to determine the TLP without causing cache and register file resource contention and reduce the shift operation overhead. Experimental results using a variety of representative workloads demonstrate that our optimization framework achieves up to 29%(21%on average) performance improvement.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  2. 吉林省高速公路竣工文件档案体系和档号编制研究%Preparation of Files System and Files Number of Completion Documents of Expressway in Jilin Province

    Institute of Scientific and Technical Information of China (English)

    高福

    2014-01-01

    The preparation and arrangement of completion document files of expressway has experienced a growing process in China. Based on introducing the current situation of files management of expressway in Jilin Province, the article teases the completion document system and files number preparation method of expressway in Jilin Province, explores the improvement measures of completion document preparation files and file number preparation of expressway in Jilin Province.%我国高速公路竣工文件档案编制整理经历了从无到有,逐渐成长的一个过程。在介绍吉林省高速公路档案管理现状的基础上,对吉林省高速公路竣工文件体系和档号编制方法进行梳理,探讨吉林省高速公路竣工文件档案编制体系和档号编制的改良办法。

  3. 78 FR 67927 - Foreign Trade Regulations (FTR): Mandatory Automated Export System Filing for All Shipments...

    Science.gov (United States)

    2013-11-13

    ... Export System Filing for All Shipments Requiring Shipper's Export Declaration Information: Substantive... the Automated Export System (AES) under control number 0607-0152. DATES: The effective date of the... instrument used for collecting export trade data, which is used by the Census Bureau for statistical...

  4. Extending the POSIX I/O interface: a parallel file system perspective.

    Energy Technology Data Exchange (ETDEWEB)

    Vilayannur, M.; Lang, S.; Ross, R.; Klundt, R.; Ward, L.; Mathematics and Computer Science; VMWare, Inc.; SNL

    2008-12-11

    The POSIX interface does not lend itself well to enabling good performance for high-end applications. Extensions are needed in the POSIX I/O interface so that high-concurrency HPC applications running on top of parallel file systems perform well. This paper presents the rationale, design, and evaluation of a reference implementation of a subset of the POSIX I/O interfaces on a widely used parallel file system (PVFS) on clusters. Experimental results on a set of micro-benchmarks confirm that the extensions to the POSIX interface greatly improve scalability and performance.

  5. Load-Balance Policy in Two Level-Cluster File System

    Institute of Scientific and Technical Information of China (English)

    LIU Yuling; SONG Weiwei; MA Xiaoxue

    2006-01-01

    In this paper, we explored a load-balancing algorithm in a cluster file system contains two levels of metadata-server,primary-level server quickly distributestasks to second-level servers depending on the closest load-balancing information. At the same time, we explored a method which accurately reflect I/O traffic and storage of storage-node: computing the heat-value of file, according to which we realized a more logical storage allocation. According to the experiment result, we conclude that this new algorithm shortens the executing time of tasks and improves the system performance compared with other load algorithm.

  6. 基于FAT32文件系统和SD卡的陶瓷窑炉测温仪设计%Design of thermoscope of ceramic kiln based on FAT32 file system and SD card

    Institute of Scientific and Technical Information of China (English)

    石长华; 谢恩

    2014-01-01

    本文设计了一种新型陶瓷窑炉温度数据采集的SD卡存储方案。该方案选用与8051单片机完全兼容的高性能单片机STC12LE5A60S2作为主控制器,采用FAT32文件系统将窑炉温度数据存储在SD卡中。同时,本文介绍了SD卡与STC12LE5A60S2芯片SPI总线通信接口原理,讨论了相关的设置、硬件连接和软件设计,实现了对SD卡的读写,解决了梭式陶瓷窑炉测温仪只能显示实时温度不能存储历史温度数据的问题。%A new kind of SD Card storage scheme is designed to collect the temperature data of a ceramic kiln. We choose as the main control STC12LE5A60S2, a high-performance single-chip microcomputer that is completely compatible to 8051 single-chip microcomputer. The temperature data of a ceramic kiln can be stored in SD Card by means of FAT32 File System. We introduce the principles of SPI trunk communication interface of SD Card and STC12LE5A60S2 chip, and we discuss the relevant set, hardware connection and software design, through which we are able to read and write on SD Card and simultaneously we solve the problem that the thermoscope of a shut-tle-shaped ceramic kiln can show the actual temperature but cannot store the historic temperature data.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2004-04-30

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

  8. Electrochemical impedance spectroscopy investigation on the clinical lifetime of ProTaper rotary file system.

    Science.gov (United States)

    Penta, Virgil; 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.

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

    Science.gov (United States)

    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

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

    Directory of Open Access Journals (Sweden)

    Virgil Penta

    2014-01-01

    Full Text Available 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.

  11. In Search of an API for Scalable File Systems: Under the Table or Above it?

    Science.gov (United States)

    2009-06-01

    Polte, Wittawat Tantisiroj, and Lin Xiao Carnegie Mellon University 1 Introduction “Big Data” is everywhere – both the IT industry and the scientific...news/specials/ bigdata /. [25] PATIL, S. V., AND GIBSON, G. GIGA+: Scalable Directories for Shared File Systems . Tech. Rep. CMU-PDL-08-108, Carnegie

  12. Beyond the Data Archive: The Creation of an Interactive Numeric File Retrieval System.

    Science.gov (United States)

    Chiang, Katherine; And Others

    1993-01-01

    Describes the creation of an interactive retrieval system for electronic numeric files that was developed at Cornell University's (New York) Mann Library. Topics discussed include user characteristics; special data characteristics; quality control; software; hardware; data preparation; database design and construction; interface; subject indexing…

  13. 17 CFR 242.608 - Filing and amendment of national market system plans.

    Science.gov (United States)

    2010-04-01

    ... EXCHANGE COMMISSION (CONTINUED) REGULATIONS M, SHO, ATS, AC, AND NMS AND CUSTOMER MARGIN REQUIREMENTS FOR SECURITY FUTURES Regulation Nms-Regulation of the National Market System § 242.608 Filing and amendment of... Regulation NMS and part 240, subpart A of this chapter shall, in addition to compliance with this...

  14. 78 FR 25740 - Meridian Energy USA, Inc. v. California Independent System Operator Corporation; Notice of Filing

    Science.gov (United States)

    2013-05-02

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Meridian Energy USA, Inc. v. California Independent System Operator Corporation; Notice of Filing Take notice that on April 24, 2013, Meridian Energy USA, Inc....

  15. IMPLEMENTATION OF 2-PHASE COMMIT BY INTEGRATING THE DATABASE & THE FILE SYSTEM

    Directory of Open Access Journals (Sweden)

    V. Raghavendra Prasad,

    2010-10-01

    Full Text Available Transaction is a series of data manipulation statements that must either fully complete or fully fail, leaving the system in a consistent state, Transactions are the key to reliable software applications In J2EE Business layer components accesses transactional resource managers like RDBMS/Messaging provider. From the databasepoint of view, the Resource Managers coordinates along with the Transaction Manager to perform the work which is transparent to the developer; however this is not possible with regards to a important resource, i.e. file system. Moreover, DBMS has the capacity to commit or roll back a transaction but this in independent of the file system. In this paper, we integrate the two-phase commit protocol of the RDBMS with the file system by using Java. As Java IO does not provide transactional support and hence it requires the developer to implement the transaction support manually in their application, this paper aims to develop a transaction aware resource manager for manipulation of files in Java.

  16. 75 FR 15429 - San Diego Gas & Electric Co.; California Independent System Operator; Notice of Filing

    Science.gov (United States)

    2010-03-29

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission 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. pursuant to the...

  17. The incidence of root microcracks caused by 3 different single-file systems versus the protaper system

    NARCIS (Netherlands)

    Liu, R.; Hou, B.X.; Wesselink, P.R.; Wu, M.K.; Shemesh, H.

    2013-01-01

    Introduction The aim of this study was to compare the incidence of root cracks observed at the apical root surface and/or in the canal wall after canal instrumentation with 3 single-file systems and the ProTaper system (Dentsply Maillefer, Ballaigues, Switzerland). Methods One hundred mandibular inc

  18. TOOL PATH GENERATION BASED ON STL FILE FOR SHEET METAL DIELESS FORMING

    Institute of Scientific and Technical Information of China (English)

    Liu Jie; Mo Jianhua

    2004-01-01

    Sheet metal dieless forming is a new metal forming technology.This technology adopts the principle of rapid prototyping technology,so it can form sheet metal parts without traditional die and moulds.According to the characteristic of sheet metal dieless forming technology a new way of tool path generation based on the STL file for sheet metal dieless forming is proposed.

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

    Science.gov (United States)

    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...

  20. A Java-based tool for creating KML files from GPS waypoints

    Science.gov (United States)

    Kinnicutt, P. G.; Rivard, C.; Rimer, S.

    2008-12-01

    Google Earth provides a free tool with powerful capabilities for visualizing geoscience images and data. Commercial software tools exist for doing sophisticated digitizing and spatial modeling , but for the purposes of presentation, visualization and overlaying aerial images with data Google Earth provides much of the functionality. Likewise, with current technologies in GPS (Global Positioning System) systems and with Google Earth Plus, it is possible to upload GPS waypoints, tracks and routes directly into Google Earth for visualization. However, older technology GPS units and even low-cost GPS units found today may lack the necessary communications interface to a computer (e.g. no Bluetooth, no WiFi, no USB, no Serial, etc.) or may have an incompatible interface, such as a Serial port but no USB adapter available. In such cases, any waypoints, tracks and routes saved in the GPS unit or recorded in a field notebook must be manually transferred to a computer for use in a GIS system or other program. This presentation describes a Java-based tool developed by the author which enables users to enter GPS coordinates in a user-friendly manner, then save these coordinates in a Keyhole MarkUp Language (KML) file format, for visualization in Google Earth. This tool either accepts user-interactive input or accepts input from a CSV (Comma Separated Value) file, which can be generated from any spreadsheet program. This tool accepts input in the form of lat/long or UTM (Universal Transverse Mercator) coordinates. This presentation describes this system's applicability through several small case studies. This free and lightweight tool simplifies the task of manually inputting GPS data into Google Earth for people working in the field without an automated mechanism for uploading the data; for instance, the user may not have internet connectivity or may not have the proper hardware or software. Since it is a Java application and not a web- based tool, it can be installed on one

  1. A Varian DynaLog file-based procedure for patient dose-volume histogram-based IMRT QA.

    Science.gov (United States)

    Calvo-Ortega, Juan F; Teke, Tony; Moragues, Sandra; Pozo, Miquel; Casals-Farran, Joan

    2014-03-06

    In the present study, we describe a method based on the analysis of the dynamic MLC log files (DynaLog) generated by the controller of a Varian linear accelerator in order to perform patient-specific IMRT QA. The DynaLog files of a Varian Millennium MLC, recorded during an IMRT treatment, can be processed using a MATLAB-based code in order to generate the actual fluence for each beam and so recalculate the actual patient dose distribution using the Eclipse treatment planning system. The accuracy of the DynaLog-based dose reconstruction procedure was assessed by introducing ten intended errors to perturb the fluence of the beams of a reference plan such that ten subsequent erroneous plans were generated. In-phantom measurements with an ionization chamber (ion chamber) and planar dose measurements using an EPID system were performed to investigate the correlation between the measured dose changes and the expected ones detected by the reconstructed plans for the ten intended erroneous cases. Moreover, the method was applied to 20 cases of clinical plans for different locations (prostate, lung, breast, and head and neck). A dose-volume histogram (DVH) metric was used to evaluate the impact of the delivery errors in terms of dose to the patient. The ionometric measurements revealed a significant positive correlation (R² = 0.9993) between the variations of the dose induced in the erroneous plans with respect to the reference plan and the corresponding changes indicated by the DynaLog-based reconstructed plans. The EPID measurements showed that the accuracy of the DynaLog-based method to reconstruct the beam fluence was comparable with the dosimetric resolution of the portal dosimetry used in this work (3%/3 mm). The DynaLog-based reconstruction method described in this study is a suitable tool to perform a patient-specific IMRT QA. This method allows us to perform patient-specific IMRT QA by evaluating the result based on the DVH metric of the planning CT image (patient

  2. A TCP/IP-based constant-bit-rate file transfer protocol and its extension to multipoint data delivery

    Energy Technology Data Exchange (ETDEWEB)

    Yamanaka, Kenjiro, E-mail: yamanaka@nii.ac.jp [National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo (Japan); Urushidani, Shigeo [National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo (Japan); Nakanishi, Hideya; Yamamoto, Takashi; Nagayama, Yoshio [National Institute of Fusion Science, 322-6 Orochi, Toki, Gifu (Japan)

    2014-05-15

    We present a new TCP/IP-based file transfer protocol which enables high-speed daisy-chain transfer. By using this protocol, we can send a file to a series of destination hosts simultaneously because intermediate hosts relay received file fragments to the next host. We achieved daisy-chain file transfer from Japan to Europe via USA at about 800 Mbps by using a prototype. The experimental result is also reported. A total link length of a data delivery network can be reduced by daisy chaining, so it enables cost-effective international data sharing.

  3. KNOWLEDGE AND XML BASED CAPP SYSTEM

    Institute of Scientific and Technical Information of China (English)

    ZHANG Shijie; SONG Laigang

    2006-01-01

    In order to enhance the intelligent level of system and improve the interactivity with other systems, a knowledge and XML based computer aided process planning (CAPP) system is implemented. It includes user management, bill of materials(BOM) management, knowledge based process planning, knowledge management and database maintaining sub-systems. This kind of nesting knowledge representation method the system provided can represent complicated arithmetic and logical relationship to deal with process planning tasks. With the representation and manipulation of XML based technological file, the system solves some important problems in web environment such as information interactive efficiency and refreshing of web page. The CAPP system is written in ASP VBScript, JavaScript, Visual C++ languages and Oracle database. At present, the CAPP system is running in Shenyang Machine Tools. The functions of it meet the requirements of enterprise production.

  4. Comparison of the amount of apical debris extrusion associated with different retreatment systems and supplementary file application during retreatment process

    Science.gov (United States)

    Çiçek, Ersan; Koçak, Mustafa Murat; Koçak, Sibel; Sağlam, Baran Can

    2016-01-01

    Background: The type of instrument affects the amount of debris extruded. The aim of this study was to compare the effect of retreatment systems and supplementary file application on the amount of apical debris extrusion. Materials and Methods: Forty-eight extracted mandibular premolars with a single canal and similar length were selected. The root canals were prepared with the ProTaper Universal system with a torque-controlled engine. The root canals were dried and were obturated using Gutta-percha and sealer. The specimens were randomly divided into four equal groups according to the retreatment procedures (Group 1, Mtwo retreatment files; Group 2, Mtwo retreatment files + Mtwo rotary file #30 supplementary file; Group 3, ProTaper Universal retreatment (PTUR) files; and Group 4, PTUR files + ProTaper F3 supplementary file). The extruded debris during instrumentation were collected into preweighed Eppendorf tubes. The amount of apically extruded debris was calculated by subtracting the initial weight of the tube from the final weight. Three consecutive weights were obtained for each tube. Results: No statistically significant difference was found in the amount of apically extruded debris between Groups 1 and 3 (P = 0.590). A significant difference was observed between Groups 1 and 2 (P < 0.05), and between Groups 3 and 4 (P < 0.05). Conclusions: The use of supplementary file significantly increased the amount of apically extruded debris. PMID:27563185

  5. Building A High Performance Parallel File System Using Grid Datafarm and ROOT I/O

    CERN Document Server

    Morita, Y; Watase, Y; Tatebe, Osamu; Sekiguchi, S; Matsuoka, S; Soda, N; Dell'Acqua, A

    2003-01-01

    Sheer amount of petabyte scale data foreseen in the LHC experiments require a careful consideration of the persistency design and the system design in the world-wide distributed computing. Event parallelism of the HENP data analysis enables us to take maximum advantage of the high performance cluster computing and networking when we keep the parallelism both in the data processing phase, in the data management phase, and in the data transfer phase. A modular architecture of FADS/ Goofy, a versatile detector simulation framework for Geant4, enables an easy choice of plug-in facilities for persistency technologies such as Objectivity/DB and ROOT I/O. The framework is designed to work naturally with the parallel file system of Grid Datafarm (Gfarm). FADS/Goofy is proven to generate 10^6 Geant4-simulated Atlas Mockup events using a 512 CPU PC cluster. The data in ROOT I/O files is replicated using Gfarm file system. The histogram information is collected from the distributed ROOT files. During the data replicatio...

  6. FSO对象模型在VB中的应用%File System Object Applied in Visual BASIC

    Institute of Scientific and Technical Information of China (English)

    陈斌; 贾青

    2001-01-01

    This paper introduces the methods and techniques of realizing I/O operations of disk files using File System Object (FSO).%本文介绍了如何使用FSO对象模型实现磁盘文件的I/O操作的方法和技巧。

  7. Architecture of scalability file system for meteorological observation data storing

    Science.gov (United States)

    Botygin, I. A.; Popov, V. N.; Tartakovsky, V. A.; Sherstnev, V. S.

    2015-11-01

    The approach allows to organize distributed storage of large amounts of diverse data in order to further their parallel processing in high performance cluster systems for problems of climatic processes analysis and forecasting. For different classes of data was used the practice of using meta descriptions - like formalism associated with certain categories of resources. Development of a metadata component was made based on an analysis of data of surface meteorological observations, atmosphere vertical sounding, atmosphere wind sounding, weather radar observing, observations from satellites and others. A common set of metadata components was formed for their general description. The structure and content of the main components of a generalized meta descriptions are presented in detail on the example of reporting meteorological observations from land and sea stations.

  8. GEODOC: the GRID document file, record structure and data element description

    Energy Technology Data Exchange (ETDEWEB)

    Trippe, T.; White, V.; Henderson, F.; Phillips, S.

    1975-11-06

    The purpose of this report is to describe the information structure of the GEODOC file. GEODOC is a computer based file which contains the descriptive cataloging and indexing information for all documents processed by the National Geothermal Information Resource Group. This file (along with other GRID files) is managed by DBMS, the Berkeley Data Base Management System. Input for the system is prepared using the IRATE Text Editing System with its extended (12 bit) character set, or punched cards.

  9. A Method to Defend File-Attacking

    Institute of Scientific and Technical Information of China (English)

    HE Hongjun; LUO Li; CAO Sihua; FENG Tao; PAN Li; ZOU Zhiji

    2006-01-01

    The paper points out that the deep reason why modern computer system fails to defense malware lies in that user has no right to control the access of information, and proposes an explicit authorization mechanism. Its basic idea is that user explicitly authorizes program the file set it can access, and monitor all file access operations; once program requests to access file out of the authorized file set, refuse it, and this means that the program is malicious or has design errors. Computers based on this novel mechanism can protect information from attacking reliably, and have good software and hardware compatibility. A testing system is presented to validate our theory.

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

    Science.gov (United States)

    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.

  11. 76 FR 63614 - Agua Caliente Solar, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2011-10-13

    ...-000] Agua Caliente Solar, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes... proceeding of Agua Caliente Solar, LLC's application for market-based rate authority, with an...

  12. 75 FR 52321 - Dry Lake Wind Power II LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2010-08-25

    ...-1720-000] Dry Lake Wind Power II LLC; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding, of Dry Lake Wind Power II LLC application for market-based rate...

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

    Science.gov (United States)

    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.

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

    Directory of Open Access Journals (Sweden)

    Daniely Amorin Meireles

    2013-08-01

    Full Text Available 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.

  15. 基于 HBase 的小文件高效存储方法%Efficient storage method of small-file based on HBase

    Institute of Scientific and Technical Information of China (English)

    熊安萍; 熊风波

    2016-01-01

    基于 Hadoop 平台的相关系统得到了广泛应用。Hadoop 分布式文件系统(Hadoop distributed file system, HDFS)通过分布式的工作方式,负责处理海量文件数据。对 HDFS 而言,海量数据中的小文件存储问题制约着系统高效工作的能力。针对海量数据中小文件读写效率低的情况,提出一种基于 HBase(Hadoop database)的海量小文件高效存储方法,利用 HBase 的存储优势,将小文件直接存储于 HBase,从而有效减少元数据节点服务器(Name-Node)的负载,并对上层应用系统提供透明的访问接口。实验结果表明,该方法可以实现海量小文件的高效存储,提高 HDFS 环境下小文件的读写效率。%In recent years,related systems have been widely used based on Hadoop.Particularly,Hadoop distributed file system(HDFS)is responsible for handling big data files by distributed way of working.However,in terms of HDFS,the problem of small-file storage in Big data is restricted by the ability of HDFS to work effectively.In the view of the lower effi-ciency of reading and writing for small-file in big data,this paper proposes an efficient storage method of Small-File based on HBase.The storage advantage of HBase is used in this paper;small files are stored in HBase directly;it reduces the NameNode load and provides the transparent access interface to the upper-level application system.The experimental result shows that the method implements efficient storage for a lot of small files,in addition,the efficiency performance of reading and writing for small files in HDFS is improved by this method.

  16. 3D VMAT Verification Based on Monte Carlo Log File Simulation with Experimental Feedback from Film Dosimetry

    Science.gov (United States)

    Barbeiro, A. R.; Ureba, A.; Baeza, J. A.; Linares, R.; Perucha, M.; Jiménez-Ortega, E.; Velázquez, S.; Mateos, J. C.

    2016-01-01

    A model based on a specific phantom, called QuAArC, has been designed for the evaluation of planning and verification systems of complex radiotherapy treatments, such as volumetric modulated arc therapy (VMAT). This model uses the high accuracy provided by the Monte Carlo (MC) simulation of log files and allows the experimental feedback from the high spatial resolution of films hosted in QuAArC. This cylindrical phantom was specifically designed to host films rolled at different radial distances able to take into account the entrance fluence and the 3D dose distribution. Ionization chamber measurements are also included in the feedback process for absolute dose considerations. In this way, automated MC simulation of treatment log files is implemented to calculate the actual delivery geometries, while the monitor units are experimentally adjusted to reconstruct the dose-volume histogram (DVH) on the patient CT. Prostate and head and neck clinical cases, previously planned with Monaco and Pinnacle treatment planning systems and verified with two different commercial systems (Delta4 and COMPASS), were selected in order to test operational feasibility of the proposed model. The proper operation of the feedback procedure was proved through the achieved high agreement between reconstructed dose distributions and the film measurements (global gamma passing rates > 90% for the 2%/2 mm criteria). The necessary discretization level of the log file for dose calculation and the potential mismatching between calculated control points and detection grid in the verification process were discussed. Besides the effect of dose calculation accuracy of the analytic algorithm implemented in treatment planning systems for a dynamic technique, it was discussed the importance of the detection density level and its location in VMAT specific phantom to obtain a more reliable DVH in the patient CT. The proposed model also showed enough robustness and efficiency to be considered as a pre

  17. Implement Instructions Access Files Directly in Operating Systems%在操作系统实现指令对文件的直接寻址

    Institute of Scientific and Technical Information of China (English)

    刘福岩; 尤晋元

    2000-01-01

    In this paper, the concept and implementation of Instructions Directly Access File are discussed,its advantage and profit are analysed. The author belives Instructions Directly Access File should be adopted in operating system.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  19. Construction and research of embedded Linux NFS root file system%嵌入式Linux NFS根文件系统的构建及研究

    Institute of Scientific and Technical Information of China (English)

    康天下; 支剑锋

    2012-01-01

    在嵌入式Linux系统开发过程中,根文件系统是构建嵌入式Linux系统的重要组成部分.为了方便和简化嵌入式Linux开发过程中的调试过程,主要研究了如何使用Busybox构建出基本的嵌入式Linux根文件系统,包括Busybox的配置、编译和安装.在此基础上,进一步构建出基于NFS的嵌入式Linux根文件系统,并给出了启动脚本和配置文件.这种根文件系统可以方便地在线更改、调试程序,降低了嵌入式系统的开发门槛.%In the process of the embedded Linux system development, the root file system is an important part of building the embedded Linux system. In order to facilitate and simplify the debugging phase of embedded Linux development process, this paper mainly researches how to build a basic embedded Linux root file system with Busybox, including the configuration, installation and compilation of Busybox. On this base, the NFS-based embedded Linux root file system was built. The startup script and configuration file are given in this paper. This root file system can be easily changed and debugged online, and reduces the threshold of embedded systems development.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  1. Computational system to create an entry file for replicating I-125 seeds simulating brachytherapy case studies using the MCNPX code

    Directory of Open Access Journals (Sweden)

    Leonardo da Silva Boia

    2014-03-01

    Full Text Available Purpose: A computational system was developed for this paper in the C++ programming language, to create a 125I radioactive seed entry file, based on the positioning of a virtual grid (template in voxel geometries, with the purpose of performing prostate cancer treatment simulations using the MCNPX code.Methods: The system is fed with information from the planning system with regard to each seed’s location and its depth, and an entry file is automatically created with all the cards (instructions for each seed regarding their cell blocks and surfaces spread out spatially in the 3D environment. The system provides with precision a reproduction of the clinical scenario for the MCNPX code’s simulation environment, thereby allowing the technique’s in-depth study.Results and Conclusion: The preliminary results from this study showed that the lateral penumbra of uniform scanning proton beams was less sensitive In order to validate the computational system, an entry file was created with 88 125I seeds that were inserted in the phantom’s MAX06 prostate region with initial activity determined for the seeds at the 0.27 mCi value. Isodose curves were obtained in all the prostate slices in 5 mm steps in the 7 to 10 cm interval, totaling 7 slices. Variance reduction techniques were applied in order to optimize computational time and the reduction of uncertainties such as photon and electron energy interruptions in 4 keV and forced collisions regarding cells of interest. Through the acquisition of isodose curves, the results obtained show that hot spots have values above 300 Gy, as anticipated in literature, stressing the importance of the sources’ correct positioning, in which the computational system developed provides, in order not to release excessive doses in adjacent risk organs. The 144 Gy prescription curve showed in the validation process that it covers perfectly a large percentage of the volume, at the same time that it demonstrates a large

  2. 77 FR 43592 - System Energy Resources, Inc.; Notice of Filing

    Science.gov (United States)

    2012-07-25

    ..., 2012, System Energy Resources, Inc. (System Energy Resources), submitted a supplement to its petition... supplement, System Energy Resources supplements its March 28 petition to provide additional information and... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY...

  3. Multi-level File Operations Recording System Based on Minifilter Driver%基于 Minifilter 的多层次文件操作行为提取技术研究

    Institute of Scientific and Technical Information of China (English)

    张陈磊; 周安民; 刘亮; 卿粼波

    2014-01-01

    This paper studied for different levels of extraction and monitoring the behavior of file operations, aimed at the existing bypass filter drivers detection method was improved, more effective against malicious software behavior, multi-level technology to extract the file operations. Firstly the paper introduces the file filter driver technology , principle and current application situation,then introduces the widely application of micro file filter driver (Minifilter) technology development principle, steps and application field. Subsequent to the underlying behavior of file operations process are analyzed, and the Minifilter detection principle of the related introduction. To analyze its security and puts forward several methods of current can bypass the filter drivers detection principle. Including by adding filter drivers and send Hook function principle to bypass filter drivers, which the filter driver behavior cannot be detected.Lists the existing several attack methods from different levels to bypass the filter driver, including attached new filter drivers, direct access to the kernel, the sending of the underlying file structure function of different hook skills and so on. According to its attack principle is analyzed, puts forward corresponding detection methods.By adding the above on the basis of the original Minifilter several detection methods, which can realize to test the present a variety of means of attack, so as to add multi-layered protective measures. And then the improved filter drivers for targeted on the function and performance test, shows that the improved test drive to be able to use a smaller time cost to complete more deeper detection. Therefore the behavior of the improved extraction technology can bypass the normal file filter driver to expand to detect malicious behavior, the extraction of deeper malicious software file operations, so as to realize the target of suspicious file operations for a more comprehensive monitoring.%文章研

  4. The NEEDS Data Base Management and Archival Mass Memory System

    Science.gov (United States)

    Bailey, G. A.; Bryant, S. B.; Thomas, D. T.; Wagnon, F. W.

    1980-01-01

    A Data Base Management System and an Archival Mass Memory System are being developed that will have a 10 to the 12th bit on-line and a 10 to the 13th off-line storage capacity. The integrated system will accept packetized data from the data staging area at 50 Mbps, create a comprehensive directory, provide for file management, record the data, perform error detection and correction, accept user requests, retrieve the requested data files and provide the data to multiple users at a combined rate of 50 Mbps. Stored and replicated data files will have a bit error rate of less than 10 to the -9th even after ten years of storage. The integrated system will be demonstrated to prove the technology late in 1981.

  5. HitPeers: A P2P File Sharing System with Category Tree

    Institute of Scientific and Technical Information of China (English)

    Jiang Shouxu(姜守旭); Liang Zhengqiang; Li Jianzhong

    2003-01-01

    HitPeers conotitute a scalable and highly efficient P2P file sharing system in which all the data file can be shared. The center of HitPeers is the Category Tree (CT). CT collects the published information with category. It is flexible enough to let users customize their own local CT. Its hierarchy helps users to find the information they desire most conveniently. To increase the robustness and retain the efficiency, HitPeers will divide the tree into disjoint parts. Every part is a subtree. Some special nodes named Onodes will take charge of the subtree and play the role of a service provider. HitPeers produce more and more Onodes to meet the service demands in the internet-scale distributed environment. This paper will show the profile of the whole system.

  6. Register file soft error recovery

    Science.gov (United States)

    Fleischer, Bruce M.; Fox, Thomas W.; Wait, Charles D.; Muff, Adam J.; Watson, III, Alfred T.

    2013-10-15

    Register file soft error recovery including a system that includes a first register file and a second register file that mirrors the first register file. The system also includes an arithmetic pipeline for receiving data read from the first register file, and error detection circuitry to detect whether the data read from the first register file includes corrupted data. The system further includes error recovery circuitry to insert an error recovery instruction into the arithmetic pipeline in response to detecting the corrupted data. The inserted error recovery instruction replaces the corrupted data in the first register file with a copy of the data from the second register file.

  7. Endodontic Treatment of Hypertaurodontic Mandibular Molar Using Reciprocating Single-file System: A Case Report.

    Science.gov (United States)

    C do Nascimento, Adriano; A F Marques, André; C Sponchiado-Júnior, Emílio; F R Garcia, Lucas; M A de Carvalho, Fredson

    2016-01-01

    Taurodontism is a developmental tooth disorder characterized by lack of constriction in the cementoenamel junction and consequent vertical stretch of the pulp chamber, accompanied by apical displacement of the pulpal floor. The endodontic treatment of teeth with this type of morpho-anatomical anomaly is challenging. The purpose of this article is to report the successful endodontic treatment of a hypertaurodontic mandibular molar using a reciprocating single-file system.

  8. A Survey of Distributed Capability File Systems and Their Application to Cloud Environments

    Science.gov (United States)

    2014-09-01

    Department of the Navy memorandum N2N6/4U119014. [2] I. R. Porche III, B. Wilson, E.-E. Johnson , S. Tierney, and E. Saltzman, “Data flood: Helping...file systems,” in Proceedings of the 2007 ACM/IEEE Conference on Supercomputing (SC’07), Nov. 2007, pp. 1–12. [61] J. G. Steiner , C. Neuman, and J. I

  9. Log-less metadata management on metadata server for parallel file systems.

    Science.gov (United States)

    Liao, Jianwei; 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.

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

    Directory of Open Access Journals (Sweden)

    Jianwei Liao

    2014-01-01

    Full Text Available 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.

  11. 77 FR 45599 - CED Rock Springs, Inc.; Supplemental Notice That Revised Market-Based Rate Tariff Filing Includes...

    Science.gov (United States)

    2012-08-01

    ...-2546-000; ER02-2546-001] CED Rock Springs, Inc.; Supplemental Notice That Revised Market- Based Rate... above-referenced proceeding of CED Rock Springs, Inc.'s tariff revision filing, noting that such...

  12. 77 FR 73650 - Electricity NH, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request...

    Science.gov (United States)

    2012-12-11

    ...] Electricity NH, LLC; Supplemental Notice That Initial Market- Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding, of Electricity...

  13. FDA Adverse Event Reporting System (FAERS): Latest Quartely Data Files

    Data.gov (United States)

    U.S. Department of Health & Human Services — The FDA Adverse Event Reporting System (FAERS) is a database that contains information on adverse event and medication error reports submitted to FDA. The database...

  14. 一种多维度存储文件系统的测试指标体系%Multi-dimensional Test Index System of Storage File System

    Institute of Scientific and Technical Information of China (English)

    王惠峰; 李先国; 李战怀; 张晓; 贺秦禄

    2011-01-01

    现有的文件系统测试工具不能准确、全面地反映文件系统的整体状况.针对该问题,提出一种多维度存储文件系统的测试指标体系,从多个角度探索影响文件系统的因素,阐述存储系统的各项技术指标,为评测和优化存储系统提供支持.介绍自主研发的专用测试工具,并对蓝鲸文件系统和CAPFS文件系统进行测试,结果表明,该文件系统指标体系有效实用.%For the existed test tools of file system can not accurately and fully reflect the overall state of the file system, the paper provides a multi-dimensional test index system of storage file system. It can explore the factors that affect the file system from multiple perspectives and comprehensively present various technical indicators of the file system. It provides strong support to evaluate and optimize the performance of storage file system. It introduces the specialized test tools and tests the Blue Whale File System(BWFS) and CAPFS. Results show the index system is practical and effective.

  15. Identifying file-sharing P2P traffic based on traffic characteristics

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    This article focuses on identifying file-sharing peer-to-peer (P2P) (such as BitTorrent (BT)) traffic at the borders of a stub network. By analyzing protocols and traffic of applications, it is found that file-sharing P2P traffic of a single user differs greatly from traditional and other P2P (such as QQ) applications' traffic in the distribution of involved remote hosts and remote ports. Therefore, a method based on discreteness of remote hosts (RHD) and discreteness of remote ports (RPD) is proposed to identify BT-like traffic. This method only relies on flow information of each user host in a stub network, and no packet payload needs to be monitored. At intervals, instant RHD for concurrent transmission control protocol and user datagram protocol flows for each host are calculated respectively through grouping flows by the stub network that the remote host of each flow belongs to. On given conditions, instant RPD are calculated through grouping flows by the remote port to amend instant RHD. Whether a host has been using a BT-like application or not can be deduced from instant RHD or average RHD for a period of time. The proposed method based on traffic characteristics is more suitable for identifying protean file-sharing P2P traffic than content-based methods. Experimental results show that this method is effective with high accuracy.

  16. 嵌入式Linux中Yaffs文件系统的构建与优化%Construction and Optimization of Yaffs File System in Embedded Linux

    Institute of Scientific and Technical Information of China (English)

    汪祖民; 张红梅

    2015-01-01

    针对嵌入式Linux开发中文件系统的重要作用,详细介绍了如何利用busybox构造一个最小的Yaffs日志型文件系统,并配置、优化文件系统的物理布局和各级子目录文件,使制作的文件系统在满足开发功能的条件下最大限度地减小所占内存空间。设置文件系统用户和所属组来提高系统安全性,使该文件系统更好地应用于嵌入式开发。并针对基于NandFlash的Yaffs在损耗均衡和垃圾回收方面的不足,提出了优化策略,延长NandFlash的使用寿命。%To important role of file system in embedded Linux,introduces how to use busybox constructs a minimal Yaffs log file system,configuration and optimization of the file system's physical layout and subdirectories at all levels,making the file system under the condition of satisfying development function maximum decrease of memory space. Settings the user and group of the file system to improve system security,in order to better apply to embedded development. And for the lack of Yaffs based on NandFlash wear leveling and garbage collection in terms of proposed optimization strategies to extend the life of NandFlash.

  17. Development of a utility system for nuclear reaction data file: WinNRDF

    Energy Technology Data Exchange (ETDEWEB)

    Aoyama, Shigeyoshi [Information Processing Center, Kitami Inst. of Tech., Hokkaido (Japan); Ohbayasi, Yosihide; Masui, Hiroshi [Meme Media Lab., Hokkaido Univ., Sapporo (Japan); Chiba, Masaki [Graduate School of Science, Hokkaido Univ., Sapporo (Japan); Kato, Kiyoshi; Ohnishi, Akira [Faculty of Social Information, Sapporo Gakuin Univ., Ebetsu, Hokkaido (Japan)

    2000-03-01

    A utility system, WinNRDF, is developed for charged particle nuclear reaction data of NRDF (Nuclear Reaction Data File) on the Windows interface. By using this system, we can easily search the experimental data of a charged particle nuclear reaction in NRDF than old retrieval systems on the mainframe and also see graphically the experimental data on GUI (Graphical User Interface). We adopted a mechanism of making a new index of keywords to put to practical use of the time dependent properties of the NRDF database. (author)

  18. DOC-a file system cache to support mobile computers

    Science.gov (United States)

    Huizinga, D. M.; Heflinger, K.

    1995-09-01

    This paper identifies design requirements of system-level support for mobile computing in small form-factor battery-powered portable computers and describes their implementation in DOC (Disconnected Operation Cache). DOC is a three-level client caching system designed and implemented to allow mobile clients to transition between connected, partially disconnected and fully disconnected modes of operation with minimal user involvement. Implemented for notebook computers, DOC addresses not only typical issues of mobile elements such as resource scarcity and fluctuations in service quality but also deals with the pitfalls of MS-DOS, the operating system which prevails in the commercial notebook market. Our experiments performed in the software engineering environment of AST Research indicate not only considerable performance gains for connected and partially disconnected modes of DOC, but also the successful operation of the disconnected mode.

  19. Evaluated nuclear data file of Th-232

    Energy Technology Data Exchange (ETDEWEB)

    Meadows, J.; Poenitz, W.; Smith, A.; Smith, D.; Whalen, J.; Howerton, R.

    1977-09-01

    An evaluated nuclear data file for thorium is described. The file extends over the energy range 0.049 (i.e., the inelastic-scattering threshold) to 20.0 MeV and is formulated within the framework of the ENDF system. The input data base, the evaluation procedures and judgments, and ancillary experiments carried out in conjunction with the evaluation are outlined. The file includes: neutron total cross sections, neutron scattering processes, neutron radiative capture cross sections, fission cross sections, (n;2n) and (n;3n) processes, fission properties (e.g., nu-bar and delayed neutron emission) and photon production processes. Regions of uncertainty are pointed out particularly where new measured results would be of value. The file is extended to thermal energies using previously reported resonance evaluations thereby providing a complete file for neutronic calculations. Integral data tests indicated that the file was suitable for neutronic calculations in the MeV range.

  20. 基于Java反射机制的Excel文件导出实现%Realization of Exporting Excel Files Based on Java Reflection

    Institute of Scientific and Technical Information of China (English)

    杨敏煜

    2012-01-01

    在信息量集中的系统中,把大量数据导出为Excel文件格式,既利于阅读也方便打印。这些特性使得Excel文件的导出被广泛应用于管理信息系统中。为了提高导出文件内容的个性化及易用性,本文探讨了利用Java的反射机制导出Excel文件的原理和方法。%Concentration in information systems, the large amounts of data export to Excel file format, not only read but also con ducive to easy printing. These features make the exported Excel file system is widely used in Management Information System. In or der to improve the content of export file personalization and ease of use, this paper discusses the principles and methods of export ing Excel file based on Java reflection mechanism.

  1. Definitions of database files and fields of the Personal Computer-Based Water Data Sources Directory

    Science.gov (United States)

    Green, J. Wayne

    1991-01-01

    This report describes the data-base files and fields of the personal computer-based Water Data Sources Directory (WDSD). The personal computer-based WDSD was derived from the U.S. Geological Survey (USGS) mainframe computer version. The mainframe version of the WDSD is a hierarchical data-base design. The personal computer-based WDSD is a relational data- base design. This report describes the data-base files and fields of the relational data-base design in dBASE IV (the use of brand names in this abstract is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey) for the personal computer. The WDSD contains information on (1) the type of organization, (2) the major orientation of water-data activities conducted by each organization, (3) the names, addresses, and telephone numbers of offices within each organization from which water data may be obtained, (4) the types of data held by each organization and the geographic locations within which these data have been collected, (5) alternative sources of an organization's data, (6) the designation of liaison personnel in matters related to water-data acquisition and indexing, (7) the volume of water data indexed for the organization, and (8) information about other types of data and services available from the organization that are pertinent to water-resources activities.

  2. Aerothermodynamic data base. Data file contents report, phase C

    Science.gov (United States)

    Lutz, G. R.

    1983-01-01

    Space shuttle aerothermodynamic data, collected from a continuing series of wind tunnel tests, are permanently stored with the Data Management Services (DMS) system. Information pertaining to current baseline configuration definition is also stored. Documentation of DMS processed data arranged sequentially and by space shuttle configuration is listed to provide an up-to-date record of all applicable aerothermodynamic data collected, processed, or summarized during the space shuttle program. Tables provide survey information to the various space shuttle managerial and technical levels.

  3. Continuous energy cross section library for MCNP/MCNPX based on JENDL high energy file 2007; FXJH7

    OpenAIRE

    佐々 敏信; 菅原 隆徳; 小迫 和明; 深堀 智生

    2008-01-01

    The latest JENDL High Energy File (JENDL/HE) was released in 2007 to respond the requirements of reaction data in high energy range up to several GeV to design accelerator facilities such as accelerator-driven systems and research complex like J-PARC. To apply the JENDL/HE-2007 file to the design study, the cross section library of FXJH7 series was constructed from the JENDL/HE file for the calculation using MCNP and MCNPX codes which are widely used in the field of nuclear reactors, fusion r...

  4. Page tamper distributed file replication system%网页防篡改中分布式文件同步复制系统

    Institute of Scientific and Technical Information of China (English)

    赵莉; 梁静

    2012-01-01

    为了解决Web服务器核心内嵌防篡改系统中,文件的分布式发布以及文件篡改后的即时恢复的问题。文中基于J2EE技术架构以及MVC(模型一视图一控制)的软件开发模式,设计了一种分布式文件同步复制系统。该系统能将文件分布式的发送到多个Web服务器上;当检测到某个Web服务器上的文件被篡改了,系统能迅速从原始库同步复制到相应的Web服务器上,以达到网页防篡改的目的。系统通过对文件进行比对,只传输差异部分,提高了系统资源利用率。%Web server core embedded tampervresistant system, in order to solve the distributed release of the document and file tampering after instant recovery, software development model based on J2EE technology architecture and the MVC (Model-View-Controller) design a distributed file replication system, file distributed of the system can send to multiple Web servers; detects that a Web server on the file has been tampered with, can quickly synchronize from the original library is copied to the appropriate Web server to reach pages anti-the purpose of tampering, system through file transfers only the different parts, to improve the utilization of system resources.

  5. Web-based healthcare hand drawing management system.

    Science.gov (United States)

    Hsieh, Sheau-Ling; Weng, Yung-Ching; Chen, Chi-Huang; Hsu, Kai-Ping; Lin, Jeng-Wei; Lai, Feipei

    2010-01-01

    The paper addresses Medical Hand Drawing Management System architecture and implementation. In the system, we developed four modules: hand drawing management module; patient medical records query module; hand drawing editing and upload module; hand drawing query module. The system adapts windows-based applications and encompasses web pages by ASP.NET hosting mechanism under web services platforms. The hand drawings implemented as files are stored in a FTP server. The file names with associated data, e.g. patient identification, drawing physician, access rights, etc. are reposited in a database. The modules can be conveniently embedded, integrated into any system. Therefore, the system possesses the hand drawing features to support daily medical operations, effectively improve healthcare qualities as well. Moreover, the system includes the printing capability to achieve a complete, computerized medical document process. In summary, the system allows web-based applications to facilitate the graphic processes for healthcare operations.

  6. ANALYSIS OF TIME DISTANCES OF ENCRYPTION/DECRYPTION OF MEDICAL INFORMATION SYSTEMS DATABASES FILES

    Directory of Open Access Journals (Sweden)

    Ye. B. Lopin

    2014-02-01

    Full Text Available In the article on the specific example the results of studies medical information systems databases files encryption/decryptiontime have been presented. The present studies are performed using the developed three fundamentally different algorithms, that include Blowfish encryption algorithm as a part. The studies were performed using a specially developed (in the programming environment Delphi 7 computer program "Generators" (author's title and two computers having obsolete configuration and assembled with the Intel Core 2 Duo E8400 processor and the DualCore Intel Pentium E2180 processor. The studies have established that the encryption/decryption of files using the first developed algorithm during execution of which multiple access to the hard drive for reading/writing of 8-byte information blocks of is implemented, takes much longer time (about 10 times than the encryption/decryption using the second and third algorithms during execution of which access to the hard drive for a file reading/writing is performed once.

  7. In Internet-Based Visualization System Study about Breakthrough Applet Security Restrictions

    OpenAIRE

    Chen, Jie; Huang, Yan

    2009-01-01

    International audience; In the process of realization Internet-based visualization system of the protein molecules, system needs to allow users to use the system to observe the molecular structure of the local computer, that is, customers can generate the three-dimensional graphics from PDB file on the client computer. This requires Applet access to local file, related to the Applet security restrictions question. In this paper include two realization methods: 1.Use such as signature tools, k...

  8. VCF-Miner: GUI-based application for mining variants and annotations stored in VCF files.

    Science.gov (United States)

    Hart, Steven N; Duffy, Patrick; Quest, Daniel J; Hossain, Asif; Meiners, Mike A; Kocher, Jean-Pierre

    2016-03-01

    Next-generation sequencing platforms are widely used to discover variants associated with disease. The processing of sequencing data involves read alignment, variant calling, variant annotation and variant filtering. The standard file format to hold variant calls is the variant call format (VCF) file. According to the format specifications, any arbitrary annotation can be added to the VCF file for downstream processing. However, most downstream analysis programs disregard annotations already present in the VCF and re-annotate variants using the annotation provided by that particular program. This precludes investigators who have collected information on variants from literature or other sources from including these annotations in the filtering and mining of variants. We have developed VCF-Miner, a graphical user interface-based stand-alone tool, to mine variants and annotation stored in the VCF. Powered by a MongoDB database engine, VCF-Miner enables the stepwise trimming of non-relevant variants. The grouping feature implemented in VCF-Miner can be used to identify somatic variants by contrasting variants in tumor and in normal samples or to identify recessive/dominant variants in family studies. It is not limited to human data, but can also be extended to include non-diploid organisms. It also supports copy number or any other variant type supported by the VCF specification. VCF-Miner can be used on a personal computer or large institutional servers and is freely available for download from http://bioinformaticstools.mayo.edu/research/vcf-miner/.

  9. A pattern-based method to automate mask inspection files

    Science.gov (United States)

    Kamal Baharin, Ezni Aznida Binti; Muhsain, Mohamad Fahmi Bin; Ahmad Ibrahim, Muhamad Asraf Bin; Ahmad Noorhani, Ahmad Nurul Ihsan Bin; Sweis, Jason; Lai, Ya-Chieh; Hurat, Philippe

    2017-03-01

    Mask inspection is a critical step in the mask manufacturing process in order to ensure all dimensions printed are within the needed tolerances. This becomes even more challenging as the device nodes shrink and the complexity of the tapeout increases. Thus, the amount of measurement points and their critical dimension (CD) types are increasing to ensure the quality of the mask. In addition to the mask quality, there is a significant amount of manpower needed when the preparation and debugging of this process are not automated. By utilizing a novel pattern search technology with the ability to measure and report match region scan-line (edge) measurements, we can create a flow to find, measure and mark all metrology locations of interest and provide this automated report to the mask shop for inspection. A digital library is created based on the technology product and node which contains the test patterns to be measured. This paper will discuss how these digital libraries will be generated and then utilized. As a time-critical part of the manufacturing process, this can also reduce the data preparation cycle time, minimize the amount of manual/human error in naming and measuring the various locations, reduce the risk of wrong/missing CD locations, and reduce the amount of manpower needed overall. We will also review an example pattern and how the reporting structure to the mask shop can be processed. This entire process can now be fully automated.

  10. 轻量级分布式文件管理在调度自动化系统中的研究与应用%Research and Application of Lightweight File Management Strategy in Power Dispatching Automation System

    Institute of Scientific and Technical Information of China (English)

    雷宝龙; 万书鹏; 陈鹏; 彭晖; 葛以踊

    2015-01-01

    电网调度自动化系统中存在着大量的图形展示文件、断面数据文件等,必须考虑如何方便、可靠地管理这些文件。分析了调度自动化系统中文件的类型及特点,提出一种轻量级分布式文件管理,通过冗余存储保证数据可靠存储,采用基于日志的增量同步维持冗余节点之间数据一致性,利用同步锁解决文件同步过程中主备机切换可能导致数据不一致问题,通过该技术可以轻便、可靠地管理文件。该文件管理已在多个省调、地调自动化系统中得到应用。%The existence of large numbers of files in a dispatching automation system asks for easy and reliable ways of their management.Based on an analysis of the types and characteristics of the dispatch automation system files,a lightweight method for file management using the local file system directly to manage files is proposed.A strategy based on log files is engineered to maintain file consistency while a synchronous lock is adopted in the file synchronization process to resolve standby machine switching that may lead to data inconsistencies.This method is applied in a dispatching automation system.

  11. TRUST MODEL BASED ON THE MULTINOMIAL SUBJECTIVE LOGIC AND RISK MECHANISM FOR P2P NETWORK OF FILE SHARING

    Institute of Scientific and Technical Information of China (English)

    Tian Junfeng; Li Chao; He Xuemin

    2011-01-01

    In order to deal with the problems in P2P systems of file sharing such as unreliability of the service,security risk and attacks caused by malicious peers,a novel Trust Model based on Multinomial subjective logic and Risk mechanism (MR-TM) is proposed.According to the multinomial subjective logic theory,the model introduces the risk mechanism.It assesses and quantifies the peers' risk,through computing the resource value,vulnerability,threat level,and finally gets the trust value by the risk value and the reputation value.The introduction of the risk value can reflect the recent behaviors of the peers better and make the system more sensitive to malicious acts.Finally,the effectiveness and feasibility of the model is illustrated by the simulation experiment designed with Peersim.

  12. Hydrogel based occlusion systems

    NARCIS (Netherlands)

    Stam, F.A.; Jackson, N.; Dubruel, P.; Adesanya, K.; Embrechts, A.; Mendes, E.; Neves, H.P.; Herijgers, P.; Verbrugghe, Y.; Shacham, Y.; Engel, L.; Krylov, V.

    2013-01-01

    A hydrogel based occlusion system, a method for occluding vessels, appendages or aneurysms, and a method for hydrogel synthesis are disclosed. The hydrogel based occlusion system includes a hydrogel having a shrunken and a swollen state and a delivery tool configured to deliver the hydrogel to a tar

  13. Computer files.

    Science.gov (United States)

    Malik, M

    1995-02-01

    From what has been said, several recommendations can be made for users of small personal computers regardless of which operating system they use. If your computer has a large hard disk not specially required by any single application, organize the disk into a small number of volumes. You will then be using the computer as if it had several smaller disks, which will help you to create a logical file structure. The size of individual volumes has to be selected carefully with respect to the files kept in each volume. Otherwise, it may be that you will have too much space in one volume and not enough in another. In each volume, organize the structure of directories and subdirectories logically so that they correspond to the logic of your file content. Be aware of the fact that the directories suggested as default when installing new software are often not the optimum. For instance, it is better to put different graphics packages under a common subdirectory rather than to install them at the same level as all other packages including statistics, text processors, etc. Create a special directory for each task you use the computer. Note that it is a bad practice to keep many different and logically unsorted files in the root directory of any of your volumes. Only system and important service files should be kept there. Although any file may be written all over the disk, access to it will be faster if it is written over the minimum number of cylinders. From time to time, use special programs that reorganize your files in this way.(ABSTRACT TRUNCATED AT 250 WORDS)

  14. Improvement of Incentive Mechanism on BitTorrent-like Peer-to-Peer File Sharing Systems

    Institute of Scientific and Technical Information of China (English)

    YU Jia-di; LI Ming-lu; HONG Feng; XUE Guang-tao

    2007-01-01

    BitTorrent is a very popular Peer.to-Peer file sharing system, which adopts a set of incentive mechanisms to encourage contribution and prevent free-riding. However,we find that BitTorrent's incentive mechanism can prevent free-riding effectively in a system with a relatively low number of seeds, but may fail in producing a disincentive for free-riding in a system with a high number of seeds. The reason is that BitTorrent does not provide effective mechanisms for seeds to guard against free-riding.Therefore, we propose a seed bandwidth allocation strategy for the BitTorrent system to reduce the effect of seeds on free-riding. Our target is that a downloader which provides more service to the system will be granted a higher benefit than downloaders which provide lower service when some downioaders ask for downloading file from a seed. Finally,simulation results are given, which validate the effectiveness of the proposed strategy.

  15. Standard interface file handbook

    Energy Technology Data Exchange (ETDEWEB)

    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.

  16. Methods for File Recovery on NTFS File System%NTFS 格式存储设备数据恢复方法研究

    Institute of Scientific and Technical Information of China (English)

    徐国天

    2015-01-01

    目的:研究 NTFS 存储设备的3种数据恢复方式,测试、比较不同方式的恢复效果,促进电子物证检验工作。方法本文针对同一 NTFS 存储设备,分别使自行设计的 NTFS 日志检验软件测试基于 NTFS 日志文件的恢复方式,使用 Final Data 的快速扫描功能测试基于 MFT 记录的恢复方式,使用 Final Data 的完整扫描功能测试基于文件头部存储特征值的恢复方式,比较3种方式的恢复效果,分析各自的恢复原理。结果基于 NTFS日志和 MFT 记录的方式恢复出的信息较全,用时较短,但不适合恢复较长时间之前删除的文件。基于文件头部存储特征值的方式可恢复较长时间前删除的文件,但用时长,不能恢复文件名、创建时间等信息,也不能有效恢复离散存储的文件。结论结合实际情况、综合运用3种方式可有效恢复数据。%Objective In practice, such situations are often encountered that the files have not been restored because of the incorrect recovery tools and/or varied restoring methods. In this paper, three data recovery modes used with NTFS storage device were analyzed and their effects were tested and compared. Methods For the same NTFS storage device, we used NTFS log inspection software developed from previous research to test the recovery choice based on NTFS log file, utilized the quick scan function of Final Data to test the recovery choice based on MFT, and used the full scan function of Final Data to test the recovery choice based on characteristic value. Finally we compared the effect of the three choices and analyzed their recovery principles. Results The recovery choices based on NTFS log file and MFT could obtain comprehensive information but were not suitable for files deleted long before. Though the recovery choice based on characteristic value played poor effect on restoring either the non-contiguous files or the file names and file-creating time, it

  17. Research on Distributed Memory of Crown Size Small Files Based on Improved HDFS%基于改进HDFS的冠字号小文件分布式存储研究

    Institute of Scientific and Technical Information of China (English)

    徐俊; 王庆华; 赵云龙

    2014-01-01

    Aiming at the access bottleneck problem caused by storage crown size small picture to the HDFS system, improved the existing HDFS system, new mechanism of distributed system is fully based on files correlation (File Correlation) and combined these correlated files. Because of all the files in HDFS are made by the master node server hosting the-NameNode single, each stored in the HDFS file needs to store the metadata it in NameNode main memory, which is bound to lead to a larger number of small file HDFS performance worse. For small file storage and management, NameNode is a heavy burden. The number of HDFS stored documents is constrainted by NameNode memory size. In addition, HDFS does not consider the correlation be-tween files. In order to improve the efficiency of small file storage and access of HDFS, this paper proposes an efficient mecha-nism for handling small files based on crown size file association. In this method, according to differentiate customer and time, a group of related files are combined into one big file, thereby reducing the number of files. To access a single file from the file cor-responding to the new index mechanism. The experimental results show that, FCHDFS greatly reduce the number of master nodes in data memory, and also improve the efficiency of storage and access to a large number of small files.%针对冠字号小图片存储到HDFS系统中带来的访问瓶颈问题,改进了原有的HDFS系统,新提出的分布式系统机制是充分基于文件相关性(File Correlation)进行合并处理的HDFS(FCHDFS)。由于HDFS中所有的文件都是由单一的主节点服务器托管-NameNode,每个存储到HDFS的文件在NameNode主存储器中都需要存储它的元数据,这必然导致小文件数量越大HDFS性能就越差。存储和管理大量的小文件,对NameNode是一个沉重的负担。可以存储在HDFS的文件数量是受到NameNode的内存大小约束。为了提高存储和访问HDFS上的

  18. Retracted: Evaluation of the incidence of microcracks caused by Mtwo and ProTaper NEXT rotary file systems versus the Self Adjusting File: A scanning electron microscopic study.

    Science.gov (United States)

    Saha, S G; Vijaywargiya, N; Dubey, S; Saxena, D; Kala, S

    2015-11-24

    The following article from International Endodontic Journal, 'Evaluation of the incidence of microcracks caused by Mtwo and ProTaper NEXT rotary file systems versus the Self Adjusting File: a scanning electron microscopic study' by S. G. Saha, N. Vijaywargiya, S. Dubey, D. Saxena & S. Kala, published online on 24 November 2015 in Wiley Online Library (wileyonlinelibrary. com), has been retracted by agreement between the authors, the journal Editor in Chief, Prof. Paul Dummer, and John Wiley & Sons Ltd. The retraction has been agreed due to the consideration that the SEM methodology used by the authors has the potential to cause cracks and is thus is not suitable for the evaluation of micro-cracks in roots.

  19. A Measurement Study of the Structured Overlay Network in P2P File-Sharing Systems

    Directory of Open Access Journals (Sweden)

    Mo Zhou

    2007-01-01

    Full Text Available The architecture of P2P file-sharing applications has been developing to meet the needs of large scale demands. The structured overlay network, also known as DHT, has been used in these applications to improve the scalability, and robustness of the system, and to make it free from single-point failure. We believe that the measurement study of the overlay network used in the real file-sharing P2P systems can provide guidance for the designing of such systems, and improve the performance of the system. In this paper, we perform the measurement in two different aspects. First, a modified client is designed to provide view to the overlay network from a single-user vision. Second, the instances of crawler programs deployed in many nodes managed to crawl the user information of the overlay network as much as possible. We also find a vulnerability in the overlay network, combined with the character of the DNS service, a more serious DDoS attack can be launched.

  20. Using the Reputation Score Management for Constructing Fair P2P File Sharing System

    Directory of Open Access Journals (Sweden)

    Jun Han

    2013-06-01

    Full Text Available This paper has used the reputation score management for constructing a fair P2P file sharing system, the system design principle is simple and easy to realize, and every node entering into the P2P network obtains a certain reputation score, and obtains the corresponding resources reward according to the score. This paper has described the fair sharing strategies facing node network bandwidth and TTL, and these strategies can be used independently or be combined with other reputation score managements of P2P network. These two strategies have been discussed in the specific reputation score management system of P2P network Eigen Trust, and the test results indicate that: compared with a common P2P network, the fair sharing strategies of this paper have faster file download speed and can decrease the network message communication amount during the process looking for resources. It can also be combined with another reputation management system. it is simple and easy to be realized, its main purposes are to fairly share network bandwidth and to decrease information communication volume, and it can suppress the free riding behavior to some extent.

  1. 14 CFR 406.113 - Filing documents with the Docket Management System (DMS) and sending documents to the...

    Science.gov (United States)

    2010-01-01

    ... Management System (DMS) and sending documents to the administrative law judge and Assistant Chief Counsel for Litigation. (a) The Federal Docket Management System (FDMS). (1) Documents filed in a civil penalty adjudication are kept in the Federal Docket Management System (FDMS), except for documents that contain...

  2. 75 FR 25885 - The Merit Systems Protection Board (MSPB) is Providing Notice of the Opportunity to File Amicus...

    Science.gov (United States)

    2010-05-10

    ... From the Federal Register Online via the Government Publishing Office ] MERIT SYSTEMS PROTECTION BOARD The Merit Systems Protection Board (MSPB) is Providing Notice of the Opportunity to File Amicus...-0953- I-1. AGENCY: Merit Systems Protection Board. ACTION: Notice. SUMMARY: Mr. Evans is a...

  3. 75 FR 6728 - The Merit Systems Protection Board (MSPB) is Providing Notice of the Opportunity to File Amicus...

    Science.gov (United States)

    2010-02-10

    ... From the Federal Register Online via the Government Publishing Office MERIT SYSTEMS PROTECTION BOARD The Merit Systems Protection Board (MSPB) is Providing Notice of the Opportunity to File Amicus... v. Department of Defense, Docket No. AT-0752-10-0184-I-1 AGENCY: Merit Systems Protection...

  4. 75 FR 20007 - The Merit Systems Protection Board (MSPB) Is Providing Notice of the Opportunity To File Amicus...

    Science.gov (United States)

    2010-04-16

    ... From the Federal Register Online via the Government Publishing Office MERIT SYSTEMS PROTECTION BOARD The Merit Systems Protection Board (MSPB) Is Providing Notice of the Opportunity To File Amicus...- 09-0261-R-1 AGENCY: Merit Systems Protection Board. ACTION: Notice. SUMMARY: Aguzie and several...

  5. Parallel File System I/O Performance Testing On LANL Clusters

    Energy Technology Data Exchange (ETDEWEB)

    Wiens, Isaac Christian [Los Alamos National Lab. (LANL), Los Alamos, NM (United States). High Performance Computing Division. Programming and Runtime Environments; Green, Jennifer Kathleen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States). High Performance Computing Division. Programming and Runtime Environments

    2016-08-18

    These are slides from a presentation on parallel file system I/O performance testing on LANL clusters. I/O is a known bottleneck for HPC applications. Performance optimization of I/O is often required. This summer project entailed integrating IOR under Pavilion and automating the results analysis. The slides cover the following topics: scope of the work, tools utilized, IOR-Pavilion test workflow, build script, IOR parameters, how parameters are passed to IOR, *run_ior: functionality, Python IOR-Output Parser, Splunk data format, Splunk dashboard and features, and future work.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  7. Evaluation of the efficiency and effectiveness of independent dose calculation followed by machine log file analysis against conventional measurement based IMRT QA.

    Science.gov (United States)

    Sun, Baozhou; Rangaraj, Dharanipathy; Boddu, Sunita; Goddu, Murty; Yang, Deshan; Palaniswaamy, Geethpriya; Yaddanapudi, Sridhar; Wooten, Omar; Mutic, Sasa

    2012-09-06

    Experimental methods are commonly used for patient-specific IMRT delivery verification. There are a variety of IMRT QA techniques which have been proposed and clinically used with a common understanding that not one single method can detect all possible errors. The aim of this work was to compare the efficiency and effectiveness of independent dose calculation followed by machine log file analysis to conventional measurement-based methods in detecting errors in IMRT delivery. Sixteen IMRT treatment plans (5 head-and-neck, 3 rectum, 3 breast, and 5 prostate plans) created with a commercial treatment planning system (TPS) were recalculated on a QA phantom. All treatment plans underwent ion chamber (IC) and 2D diode array measurements. The same set of plans was also recomputed with another commercial treatment planning system and the two sets of calculations were compared. The deviations between dosimetric measurements and independent dose calculation were evaluated. The comparisons included evaluations of DVHs and point doses calculated by the two TPS systems. Machine log files were captured during pretreatment composite point dose measurements and analyzed to verify data transfer and performance of the delivery machine. Average deviation between IC measurements and point dose calculations with the two TPSs for head-and-neck plans were 1.2 ± 1.3% and 1.4 ± 1.6%, respectively. For 2D diode array measurements, the mean gamma value with 3% dose difference and 3 mm distance-to-agreement was within 1.5% for 13 of 16 plans. The mean 3D dose differences calculated from two TPSs were within 3% for head-and-neck cases and within 2% for other plans. The machine log file analysis showed that the gantry angle, jaw position, collimator angle, and MUs were consistent as planned, and maximal MLC position error was less than 0.5 mm. The independent dose calculation followed by the machine log analysis takes an average 47 ± 6 minutes, while the experimental approach (using IC and

  8. Correlation of phantom-based and log file patient-specific QA with complexity scores for VMAT.

    Science.gov (United States)

    Agnew, Christina E; Irvine, Denise M; McGarry, Conor K

    2014-11-08

    The motivation for this study was to reduce physics workload relating to patient- specific quality assurance (QA). VMAT plan delivery accuracy was determined from analysis of pre- and on-treatment trajectory log files and phantom-based ionization chamber array measurements. The correlation in this combination of measurements for patient-specific QA was investigated. The relationship between delivery errors and plan complexity was investigated as a potential method to further reduce patient-specific QA workload. Thirty VMAT plans from three treatment sites - prostate only, prostate and pelvic node (PPN), and head and neck (H&N) - were retrospectively analyzed in this work. The 2D fluence delivery reconstructed from pretreatment and on-treatment trajectory log files was compared with the planned fluence using gamma analysis. Pretreatment dose delivery verification was also car- ried out using gamma analysis of ionization chamber array measurements compared with calculated doses. Pearson correlations were used to explore any relationship between trajectory log file (pretreatment and on-treatment) and ionization chamber array gamma results (pretreatment). Plan complexity was assessed using the MU/ arc and the modulation complexity score (MCS), with Pearson correlations used to examine any relationships between complexity metrics and plan delivery accu- racy. Trajectory log files were also used to further explore the accuracy of MLC and gantry positions. Pretreatment 1%/1 mm gamma passing rates for trajectory log file analysis were 99.1% (98.7%-99.2%), 99.3% (99.1%-99.5%), and 98.4% (97.3%-98.8%) (median (IQR)) for prostate, PPN, and H&N, respectively, and were significantly correlated to on-treatment trajectory log file gamma results (R = 0.989, p log file gamma results (R = 0.623, p 0.57, p log file fluence delivery and ionization chamber array measurements were strongly correlated with on-treatment trajectory log file fluence delivery. The strong corre- lation

  9. Hydrogel based occlusion systems

    OpenAIRE

    Stam, F.A.; Jackson, N.; Dubruel, P.; Adesanya, K.; Embrechts, A; Mendes, E.; Neves, H.P.; Herijgers, P; Verbrugghe, Y.; Shacham, Y.; Engel, L.; Krylov, V

    2013-01-01

    A hydrogel based occlusion system, a method for occluding vessels, appendages or aneurysms, and a method for hydrogel synthesis are disclosed. The hydrogel based occlusion system includes a hydrogel having a shrunken and a swollen state and a delivery tool configured to deliver the hydrogel to a target occlusion location. The hydrogel is configured to permanently occlude the target occlusion location in the swollen state. The hydrogel may be an electro-activated hydrogel (EAH) which could be ...

  10. Research on Technology of Recovery Algorithm based on File Feature in Computer Forensics%计算机取证中基于文件特征的数据恢复算法技术研究

    Institute of Scientific and Technical Information of China (English)

    李贵华; 荣世辉; 王刚

    2013-01-01

      为解决计算机取证中的数据恢复问题,提出了一种基于新式技术文件系统( new technology file system,NTFS)的数据恢复方案。通过剖析其主控文件表(master file table,MFT),提出一种基于文件特征的数据恢复算法。此算法通过全盘深粒度扫描磁盘扇区并根据各种类型文件的头部和尾部特征码在磁盘中匹配确定文件的起始和结束扇区,从而根据文件起始、结束扇区之间数据重建恢复此类型文件。实验结果表明,通过此算法设计的软件在搜索量,效率方面都有明显改善。%To solve data recovery problems in computer forensics, this paper proposed a new method for data recovery based on NTFS( new technology file system). By analyzing the structure of MFT(master file table),a recovery algorithm based on file feature,was presented in this paper.The algorithm identified the startand end sector of the lost file by scanning all sectors of the disk and matched them according to the head and foot feature codesof the lost files,then recovered the files by restoring the data between the start and the end sector.Experimental results show that the designed software in the search volume and efficiency has been improved significantly.

  11. 云存储环境下文件系统伸缩性研究%Research on Scalability of File System in Cloud Storage Environment

    Institute of Scientific and Technical Information of China (English)

    李晓慧; 李战怀; 张晓; 李兆虎

    2012-01-01

    In the cloud storage environment, servers need to allocate storage space for clients dynamicly. This paper specifically aims at managing the NTFS file system volumes. It highlights the important data structure of the NTFS file system, and designs and implements a tool which expands or shrinks system volume based on needs. The experiments show that the tool can expand or shrink the size of the file system volume without data corruption.%在云存储环境下,为解决存储资源利用率问题,服务器端需动态为用户分配存储空间.本文致力于解决如何伸缩系统卷文件系统可识别大小.具体针对NTFS文件系统卷,重点介绍NTFS文件系统关于容量管理的重要数据结构,设计并实现根据用户申请的磁盘空间大小,自动伸缩系统卷的工具.实验表明:该工具能够在无数据损坏的前提下快速扩展或缩小系统卷文件系统识别的大小.

  12. I/O Performance of an RAID-10 Style Parallel File System

    Institute of Scientific and Technical Information of China (English)

    Dan Feng; Hong Jiang; Yi-Feng Zhu

    2004-01-01

    Without any additional cost, all the disks on the nodes of a cluster can be connected together through CEFT-PVFS, an RAID-10 style parallel file system, to provide a multi-GB/s parallel I/O performance.I/O response time is one of the most important measures of quality of service for a client. When multiple clients submit data-intensive jobs at the same time, the response time experienced by the user is an indicator of the power of the cluster. In this paper, a queuing model is used to analyze in detail the average response time when multiple clients access CEFT-PVFS. The results reveal that response time is with a function of several operational parameters. The results show that I/O response time decreases with the increases in I/O buffer hit rate for read requests, write buffer size for write requests and the number of server nodes in the parallel file system, while the higher the I/O requests arrival rate, the longer the I/O response time. On the other hand, the collective power of a large cluster supported by CEFT-PVFS is shown to be able to sustain a steady and stable I/O response time for a relatively large range of the request arrival rate.

  13. A NeXus/HDF5 based file format for STXM

    Science.gov (United States)

    Watts, Benjamin; Raabe, Jörg

    2016-01-01

    Scanning Transmission X-ray Microscopy (STXM) is a relatively recent and rapidly growing X-ray imaging technique with niche capabilities that are applicable across a wide set of scientific disciplines. Over the years since its invention, technological progress has allowed a much greater volume and wider variety of data to be recorded, while the flexibility of the technique has also given rise to many variations, utilizing different contrast mechanisms, detection modes, scanning modes, sample configurations and sample environments. There is, therefore, increasing dissatisfaction with the predominant data file format. Here, we present a new file format, NXstxm, based on the NeXus standard and utilizing the HDF5 container format. The design of the format is based on principles of 1. All STXM experiments should be possible to describe, 2. The set of common scan types should be easy to read, and 3. Saving of all instrument parameters is encouraged. We further discuss the philosophy behind some of the choices made in defining the NXstxm format.

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

    Science.gov (United States)

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

    2011-12-01

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

  15. 77 FR 20380 - Iron Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-04-04

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Iron Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Iron Energy LLC's application for market-based rate authority, with an...

  16. 78 FR 7773 - CCI Roseton LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2013-02-04

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission CCI Roseton LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of CCI Roseton LLC's application for market-based rate authority, with an...

  17. 75 FR 70738 - Domtar A.W. LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2010-11-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Domtar A.W. LLC; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding of Domtar A.W. LLC's application for market-based rate authority,...

  18. 77 FR 42301 - W Power, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-07-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission W Power, LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of W Power, LLC's application for market-based rate authority, with an...

  19. 75 FR 70739 - Domtar A.W. LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2010-11-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Domtar A.W. LLC; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding of Domtar A.W. LLC's application for market-based rate authority,...

  20. 75 FR 26747 - Meadow Lake Wind Farm III LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2010-05-12

    ...-1176-000] Meadow Lake Wind Farm III LLC; Supplemental Notice That Initial Market-Based Rate Filing... above-referenced proceeding of Meadow Lake Wind Farm III LLC's application for market-based rate... clicking on the appropriate link in the above list. They are also available for review in the Commission's...

  1. 77 FR 36529 - Apple Group LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-06-19

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Apple Group LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Apple Group LLC's application for market-based rate authority, with an accompanying...

  2. 77 FR 67811 - Porter-Walker LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-11-14

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Porter-Walker LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Porter-Walker LLC's application for market-based rate authority, with an...

  3. 76 FR 15307 - Holcim (US) Inc.; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2011-03-21

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Holcim (US) Inc.; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Holcim (US) Inc.'s application for market-based rate authority, with an...

  4. 75 FR 57017 - Icetec.com, Inc.; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2010-09-17

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Icetec.com , Inc.; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding of Icetec.com , Inc.'s application for market-based rate...

  5. 77 FR 42721 - Limon Wind, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-07-20

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Limon Wind, LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of Limon Wind, LLC's application for market-based rate authority, with an accompanying...

  6. 77 FR 64978 - Dynamo Power LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-10-24

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Dynamo Power LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Dynamo Power LLC's application for market-based rate authority, with an...

  7. 77 FR 58124 - Dynamo Power LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-09-19

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Dynamo Power LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of Dynamo Power LLC's application for market-based rate authority, with...

  8. 75 FR 359 - Google Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2010-01-05

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Google Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing... the above-referenced proceeding of Google Energy LLC's application for market-based rate...

  9. 76 FR 70438 - Manzana Wind LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2011-11-14

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Manzana Wind LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Manzana Wind LLC's application for market-based rate authority, with an...

  10. 78 FR 38310 - Kiwi Energy Inc.; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2013-06-26

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Kiwi Energy Inc.; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of Kiwi Energy Inc.'s application for market-based rate authority, with...

  11. 77 FR 50100 - AP&G Holdings LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-08-20

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission AP&G Holdings LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of AP&G Holdings LLC's application for market-based rate authority, with...

  12. 78 FR 16495 - Switch Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2013-03-15

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Switch Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding, of Switch Energy LLC's application for market-based rate authority, with...

  13. 77 FR 27767 - Galaxy Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-05-11

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Galaxy Energy LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of Galaxy Energy LLC's application for market-based rate authority, with...

  14. 基于机器学习的并行文件系统性能预测%Predicting the Parallel File System Performance via Machine Learning

    Institute of Scientific and Technical Information of China (English)

    赵铁柱; 董守斌; Verdi March; Simon See

    2011-01-01

    并行文件系统能有效解决高性能计算系统的海量数据存储和I/O瓶颈问题.由于影响系统性能的因素十分复杂,如何有效地评估系统性能并对性能进行预测成为一个潜在的挑战和热点.以并行文件系统的性能评估和预测作为研究目标,在研究文件系统的架构和性能因子后,设计了一个基于机器学习的并行文件系统预测模型,运用特征选择算法对性能因子数量进行约简,挖掘出系统性能和影响因子之间的特定的关系进行性能预测.通过设计大量实验用例,对特定的Lustre文件系统进行性能评估和预测.评估和实验结果表明:threads/OST、对象存储器(OSS)的数量、磁盘数目和RAID的组织方式是4个调整系统性能最重要因子,预测结果的平均相对误差能控制在25.1%~32.1%之间,具有较好预准确度.%Parallel file system can effectively solve the problems of massive data storage and I/O bottleneck. Because the potential impact on the system is not clearly understood, how to evaluate and predict performance of parallel file system becomes the potential challenge and hotspot. In this work,we aim to research the performance evaluation and prediction of parallel file system. After studying the architecture and performance factors of such file system, we design a predictive mode of parallel file system based on machine learning approaches. We use feature selection algorithms to reduce the number of performance factors to be tested in validating the performance. We also mine the particular relationship of system performance and impact factors to predict the performance of a specific file system. We validate and predict the performance of a specific Lustre file system through a series of experiment cases. Our evaluation and experiment results indicate that threads/OST, num of OSSs (Object Storage Server), hum of disks and num and type of RAID are the four most important parameters to tune the performance

  15. 集中管控安全文件系统%Secure File System for Centralized Storage

    Institute of Scientific and Technical Information of China (English)

    周英红

    2011-01-01

    Firstly, the security issue of general file system applicable to centralized storage system is analyzed, then the necessity for independent development of the secure file system raised, and the implementation technology of the secure file system explored. A secure file system architecture with specific file format, access interface and encryption method is proposed. With this architecture, the sensitive message could be safely managed by adoption of customized file browser, secret-level identifier and access log.%在分析了集中管控系统中采用国外通用文件系统可能存在的问题的基础上,提出了自主研发国产化安全文件系统的必要性,并探讨了安全文件系统的实现技术,构建了一个从文件格式、文件访问接口、文件存储加密等方面来保护存储信息的安全文件系统体系结构,并采用专用文件浏览器、文件密级标识、文件访问日志等措施来规范和管理对敏感信息的使用,从技术上杜绝病毒、木马等恶意程序在文件系统内部的传播、感染,有效阻止病毒、木马对涉密文件的窃取。

  16. Tracer dynamics in a single-file system with absorbing boundary.

    Science.gov (United States)

    Ryabov, Artem; Chvosta, Petr

    2014-02-01

    The paper addresses the single-file diffusion in the presence of an absorbing boundary. The emphasis is on an interplay between the hard-core interparticle interaction and the absorption process. The resulting dynamics exhibits several qualitatively new features. First, starting with the exact probability density function for a given particle (a tracer), we study the long-time asymptotics of its moments. Both the mean position and the mean-square displacement are controlled by dynamical exponents which depend on the initial order of the particle in the file. Second, conditioning on nonabsorption, we study the distribution of long-living particles. In the conditioned framework, the dynamical exponents are the same for all particles, however, a given particle possesses an effective diffusion coefficient which depends on its initial order. After performing the thermodynamic limit, the conditioned dynamics of the tracer is subdiffusive, the generalized diffusion coefficient D(1/2) being different from that reported for the system without absorbing boundary.

  17. EARS: An Online Bibliographic Search and Retrieval System Based on Ordered Explosion.

    Science.gov (United States)

    Ramesh, R.; Drury, Colin G.

    1987-01-01

    Provides overview of Ergonomics Abstracts Retrieval System (EARS), an online bibliographic search and retrieval system in the area of human factors engineering. Other online systems are described, the design of EARS based on inverted file organization is explained, and system expansions including a thesaurus are discussed. (Author/LRW)

  18. Photon-HDF5: An Open File Format for Timestamp-Based Single-Molecule Fluorescence Experiments.

    Science.gov (United States)

    Ingargiola, Antonino; Laurence, Ted; Boutelle, Robert; Weiss, Shimon; Michalet, Xavier

    2016-01-01

    We introduce Photon-HDF5, an open and efficient file format to simplify exchange and long-term accessibility of data from single-molecule fluorescence experiments based on photon-counting detectors such as single-photon avalanche diode, photomultiplier tube, or arrays of such detectors. The format is based on HDF5, a widely used platform- and language-independent hierarchical file format for which user-friendly viewers are available. Photon-HDF5 can store raw photon data (timestamp, channel number, etc.) from any acquisition hardware, but also setup and sample description, information on provenance, authorship and other metadata, and is flexible enough to include any kind of custom data. The format specifications are hosted on a public website, which is open to contributions by the biophysics community. As an initial resource, the website provides code examples to read Photon-HDF5 files in several programming languages and a reference Python library (phconvert), to create new Photon-HDF5 files and convert several existing file formats into Photon-HDF5. To encourage adoption by the academic and commercial communities, all software is released under the MIT open source license.

  19. [A new computerized system for electroencephalography at the Kochi Medical School Hospital: the present status and problems of electroencephalogram data filing systems].

    Science.gov (United States)

    Doi, T; Kataoka, H; Nishida, M; Sasaki, M

    1990-06-01

    The usual electroencephalography (EEG) recording consumes great amounts of paper, considerable storage space for records and much time and energy for their search and retrieval. In addition, we can not perform digitized analyses of the records with the present method. To solve these problems, our laboratory developed a new computerized system for EEG, in which data are retained in optic disks, and which has been in service for routine examination since December, 1988. The functions of the system and EEG filing system, include the collection, retention, retrieval, transmission and analyses of data with the reproduction of the original EEG and editing function of summary reports to be filed in the medical records. The summary report consists of summary, characteristic wave patterns picked up and edited from EEG, and spectral array and topographical mapping by digitized analyses of EEG. The condition for the collection of EEG data was 200 Hz/8 bit, and the reproduced wave patterns were accepted by all clinicians. The merits of the system include; (i) saving of paper, space and time needed for EEG, (ii) enabling the comparison of the wave patterns in the form of summary reports and (iii) the capability of digitized analyses of EEG by retaining the EEG data in the data base. The problems remaining to be improved for the system are the longer time required for examination (5-10 min) and the higher running cost (yen 460/order). Regarding the latter problem, a revised method which dispenses with recording paper is under consideration. That is, in the case of screening examinations, summary reports for medical records alone would be delivered to clinicians. This idea has been accepted by some clinicians. To realize the revised system, we presently are planning to establish a method to display EEG on CRT.

  20. File Encryptiou System Using IBE Service%基于IBE Service的新型文件加密系统

    Institute of Scientific and Technical Information of China (English)

    施健; 陈铁明; 茆俊康

    2012-01-01

    Identity-based public key encryption (short for IBE) system can directly take user's ID as her public key, without need of public key certificate. Comparing to the traditional PKI, IBE is easy to develop and deploy with lower cost. It is specially suited for the enterprises with centralized key management supported. In this paper, a web service-based IBE key management service system, IBE Service, is firstly proposed, which facilitates users of different security domains to manage IBE keys and provides a user secure policy-centered key service. Based on IBE service, a general file encryption client application is then developed. It utilizes SOAP protocol to implement XML-based IBE key data communications. The proposed new file encryption system can map the receiver's ID as her public key, and the receiver can automatically do decryption by achieving her private key from IBE service. It is more secure, efficient, as well as with flexible ID secure policy supported.%基于身份的公钥加密(Identity-based Encryption,简称IBE)体制采用用户ID作为公钥,无需公钥证书操作,较传统的PKI体系具有开发部署简单、应用成本低等优势,尤其适用于密钥集中式管理的企业级应用.设计了一个基于Web Service的IBE密钥管理服务系统IBE Service,实现各个网络安全域内的用户密钥管理,提供以用户安全策略为中心的密钥服务;基于IBE Service开发了一个面向通用文件加密的客户端应用,主要通过SOAP服务接口实现基于XML的IBE密钥数据交互.新型的文件加密系统可将接收方ID直接映射为公钥,接收方自动向IBE Service获取私钥完成文件解密,具有安全、便捷等优点,且支持灵活的ID安全策略管理.

  1. Internet-based dimensional verification system for reverse engineering processes

    Energy Technology Data Exchange (ETDEWEB)

    Song, In Ho [Ajou University, Suwon (Korea, Republic of); Kim, Kyung Don [Small Business Corporation, Suwon (Korea, Republic of); Chung, Sung Chong [Hanyang University, Seoul (Korea, Republic of)

    2008-07-15

    This paper proposes a design methodology for a Web-based collaborative system applicable to reverse engineering processes in a distributed environment. By using the developed system, design reviewers of new products are able to confirm geometric shapes, inspect dimensional information of products through measured point data, and exchange views with other design reviewers on the Web. In addition, it is applicable to verifying accuracy of production processes by manufacturing engineers. Functional requirements for designing this Web-based dimensional verification system are described in this paper. ActiveX-server architecture and OpenGL plug-in methods using ActiveX controls realize the proposed system. In the developed system, visualization and dimensional inspection of the measured point data are done directly on the Web: conversion of the point data into a CAD file or a VRML form is unnecessary. Dimensional verification results and design modification ideas are uploaded to markups and/or XML files during collaboration processes. Collaborators review the markup results created by others to produce a good design result on the Web. The use of XML files allows information sharing on the Web to be independent of the platform of the developed system. It is possible to diversify the information sharing capability among design collaborators. Validity and effectiveness of the developed system has been confirmed by case studies

  2. Stealing and Leakage Monitoring System for Sensitive File in RingO Layer%Ring0层敏感文件窃泄密监测系统

    Institute of Scientific and Technical Information of China (English)

    王晓箴; 严坚; 吴焕; 刘宝旭

    2011-01-01

    为使敏感文件免遭窃泄密攻击的威胁,设计并实现一个基于Ring0层的主机型敏感文件窃泄密监测系统,通过敏感文件查找、文件异常行为监测等功能,对敏感文件进行实时监测和保护.该系统已应用于实际工作中,取得了良好效果.%To keep the sensitive file away from the thread of stealing and leakage, this paper designs and implements a stealing and leakage monitor system based on Ring0 privileged code. The system can monitor and protect confidential files promptly by using the components of file searching and unordinary action monitoring. The system's performance is satisfying in practice.

  3. Disaster Tolerance System Building in File Management System%浅谈档案管理系统中的灾容系统建设

    Institute of Scientific and Technical Information of China (English)

    孙锋

    2011-01-01

    本文简要介绍了容灾系统的基本原理和技术,及其在档案管理系统方面的主要应用,并提出档案系统中建设容灾系统的对策。%This paper introduces the basic principles of disaster recovery systems and technology, and its file management system in the main application,and proposed the construction of the file system disaster recovery system response.

  4. Evaluation of apical extrusion of debris and irrigant using two new reciprocating and one continuous rotation single file systems.

    Directory of Open Access Journals (Sweden)

    Gurudutt Nayak

    2014-06-01

    Full Text Available 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.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.The Reciproc file system produced significantly more debris compared with OneShape file system (P0.05. Extrusion of irrigant was statistically insignificant irrespective of the instrument or instrumentation technique used (P >0.05.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.

  5. Design and implementation of mobile phone file management utility based on Android%基于Android系统的手机文件管理器的设计与实现

    Institute of Scientific and Technical Information of China (English)

    陈煜; 周荣辉

    2012-01-01

    Based on Android SDK 2.1, the author designed and implemented a practical mobile phone file management utility, which mainly provided functions such as file browsing, file management, file searching, parameter setting and so on. This thesis introduced the level of file management utility in Android architecture, displayed file system information by list view through using a customized array adapter. According to the function of file management and Android activity lifecycle, the paper designed the application interface and transition of different activity, applied MVC to deal with the file operation processes, discussed three kinds of data storage patterns used in the application.%基于Android SDK 2.1,设计了一款实用的手机文件管理器,能够较好地实现Android 文件系统的文件浏览、文件管理、文件搜索、参数设置等功能.文中介绍文件管理器在整个Android系统架构中的层次,通过自定义适配器实现文件系统信息在listview上的显示.根据文件管理器的功能并结合Android activity的生命周期,设计了应用的界面及不同activity之间的 转换,把MVC模式应用到文件管理操作的实现过程中,同时探讨了开发中用到的3种Android 数据存储方式.

  6. The dental X-ray file of crew members in the Scandinavian Airlines System (SAS).

    Science.gov (United States)

    Keiser-Nielsen, S; Johanson, G; Solheim, T

    1981-11-01

    In 1977, the Scandinavian Airlines System (SAS) established a dental X-ray file of all crew members. Its aim was to have immediately available an adequate set of physical antemortem data useful for identification in case of a fatal crash. Recently, an investigation into the quality and suitability of this material was carried out. The radiographs of 100 Danish, 100 Norwegian, and 100 Swedish pilots were picked at random and evaluated for formal deficiences, technical deficiencies, treatment pattern as useful for identification purposes, and the presence of pathology. The major results of the investigation were that a number of formal and technical deficiencies were disclosed, that the treatment pattern would seem adequate for identification purposes, and that a number of pathological findings were made, several of which had to be considered possible safety risks in the form of barodontalgia.

  7. Cleaning Effectiveness of a Reciprocating Single-file and a Conventional Rotary Instrumentation System

    Science.gov (United States)

    de Carvalho, Fredson Marcio Acris; Gonçalves, Leonardo Cantanhede de Oliveira; Marques, André Augusto Franco; Alves, Vanessa; Bueno, Carlos Eduardo da Silveira; De Martin, Alexandre Sigrist

    2016-01-01

    Objective: To compare cleaning effectiveness by histological analysis of a reciprocating single-file system with ProTaper rotary instruments during the preparation of curved root canals in extracted teeth. Methods: A total of 40 root canals with curvatures ranging between 20 - 40 degrees were divided into two groups of 20 canals. Canals were prepared to the following apical sizes: Reciproc size 25 (n=20); ProTaper: F2 (n=20). The normal distribution of data was tested by the Kolmogorov-Smirnov test and the values obtained for the test (Mann-Whitney U test, P .05) between the two groups. Conclusion: The application of reciprocating motion during instrumentation did not result in increased debris when compared with continuous rotation motion, even in the apical part of curved canals. Both instruments resulted in debris in the canal lumen, irrespective of the movement kinematics applied. PMID:28217185

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

    Science.gov (United States)

    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 (α = 0.05). Using a patency file during canal preparation significantly decreased both apical transportation and curve straightening (P ProTaper rotary system.

  9. 78 FR 56690 - PE Hydro Generation, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2013-09-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission PE Hydro Generation, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding, of PE...

  10. 78 FR 29130 - Solar Star California XIX, LLC; Supplemental Notice that Initial Market-Based Rate Filing...

    Science.gov (United States)

    2013-05-17

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Solar Star California XIX, LLC; Supplemental Notice that Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding, of...

  11. 75 FR 80486 - Sustainable Star, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request...

    Science.gov (United States)

    2010-12-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Sustainable Star, LLC; Supplemental Notice That Initial Market- Based Rate Filing Includes Request for Blanket Section 204 Authorization December 15, 2010. This is a supplemental notice in the above-referenced...

  12. 77 FR 66976 - Star Energy Partners LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2012-11-08

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Star Energy Partners LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding of Star...

  13. 78 FR 29131 - Solar Star California XX, LLC; Supplemental Notice that Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2013-05-17

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Solar Star California XX, LLC; Supplemental Notice that Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding, of...

  14. A fast video clip retrieval algorithm based on VA-file

    Science.gov (United States)

    Liu, Fangjie; Dong, DaoGuo; Miao, Xiaoping; Xue, XiangYang

    2003-12-01

    Video clip retrieval is a significant research topic of content-base multimedia retrieval. Generally, video clip retrieval process is carried out as following: (1) segment a video clip into shots; (2) extract a key frame from each shot as its representative; (3) denote every key frame as a feature vector, and thus a video clip can be denoted as a sequence of feature vectors; (4) retrieve match clip by computing the similarity between the feature vector sequence of a query clip and the feature vector sequence of any clip in database. To carry out fast video clip retrieval the index structure is indispensable. According to our literature survey, S2-tree [17] is the one and only index structure having been applied to support video clip retrieval, which combines the characteristics of both X-tree and Suffix-tree and converts the series vectors retrieval to string matching. But S2-tree structure will not be applicable if the feature vector's dimension is beyond 20, because the X-tree itself cannot be used to sustain similarity query effectively when dimensions of vectors are beyond 20. Furthermore, it cannot support flexible similarity definitions between two vector sequences. VA-file represents the vector approximately by compressing the original data and it maintains the original order when representing vectors in a sequence, which is a very valuable merit for vector sequences matching. In this paper, a new video clip similarity model as well as video clip retrieval algorithm based on VA-File are proposed. The experiments show that our algorithm incredibly shortened the retrieval time compared to sequential scanning without index structure.

  15. The analysis of I node of file system in Linux%Linux文件系统中I节点的分析

    Institute of Scientific and Technical Information of China (English)

    帅峰云; 施展

    2011-01-01

    File system is an important part of the operating system, due to various formats file systems are supported in Linux, so how to access the file system in different formats and achieve to information sharing between different formats file systems become very impoortant. Taking Ext2 format file system as an example, we described in detail that the process of Linux operating system access different formats file system, and a complete framework for Linux file system, and the relation contents of node I that be used in access documents.%文件系统是一个操作系统的重要组成部分,由于Linux支持多种格式的文件系统,因此系统如何访问不同格式的文件系统并且实现不同格式的文件系统之间资料的共享就显得很重要.主要是结合Ext2格式的文件系统为例,详细讲述了Linux操作系统访问不同格式文件系统的过程和一个完整Linux文件系统的框架以及访问文件时用到的I节点的相关内容.

  16. File Caving of Oracle Data File%Oracle数据文件的文件雕复

    Institute of Scientific and Technical Information of China (English)

    武振东; 汪中夏

    2013-01-01

    在系统元信息被破坏或不信任的环境下,传统数据恢复方法难以完整地恢复Oracle数据文件。为此,提出不依赖系统元信息,不使用Oracle控制文件和日志文件信息,而是基于Oracle数据文件内部结构特征进行文件雕复的数据恢复方法。采用并行唯一路径、二分碎片间隙雕复和熵值等方法进行碎片侦测,设计一种基于文件头关键字和文件地址的雕复方法。实验结果表明,该方法在无系统元信息的情况下,能有效提取Oracle数据文件,摆脱传统数据恢复对系统元信息的依赖性。%In the situation that the metadata of file system is distrusted or cannot be trusted, it is difficult to recovery the Oracle data files completely with the traditional method of data recovery. Rather than rely on the metadata of file system, Oracle control file and log file information, the file carving based on the characteristics of the Oracle data files’ internal structure is realized. File carving strategies like ideas parallel unique path, bi-fragment gap carving, entropy and so on are adopted to detect the fragment of Oracle data files. It proposes a file caving algorithm based on the keywords of the file header and file addresses. Experimental results show that this algorithm can also extract Oracle data files effectively with no metadata of file system while it gets rid of the traditional data recovery dependences on the metadata of file system.

  17. Models of a Distributed Information Retrieval System Based on Thesauri with Weights.

    Science.gov (United States)

    Mazur, Zygmunt

    1994-01-01

    Discusses distributed information retrieval systems that take into account the weights of descriptors from thesauri. Topics addressed include a mathematical model for information retrieval subsystems; organization of inverted files; models for the distributed homogeneous information systems; a distributed information retrieval system based on…

  18. Dentinal damage and fracture resistance of oval roots prepared with single-file systems using different kinematics.

    Science.gov (United States)

    Abou El Nasr, Hend Mahmoud; Abd El Kader, Karim Galal

    2014-06-01

    Vertical root fracture is a common finding in endodontically treated teeth, notably oval roots. The aim of the present study was to determine the effect of instrumentation kinematics and the material of instrument construction of single-file systems on dentin walls and fracture resistance of oval roots. Sixty-five roots with oval canals were allocated into a control group (n = 5) and 3 experimental groups of 20 roots each. Group WO was instrumented with the WaveOne primary file (Dentsply Maillefer, Baillagues, Switzerland), group PT-Rec was prepared with F2 ProTaper files (Dentsply Maillefer, Baillagues, Switzerland) used in a reciprocating motion, and group PT-Rot was prepared with F2 ProTaper files used in a rotation motion. For crack evaluation, half of the samples (n = 30) were embedded in acrylic resin, and the blocks were sectioned at 3, 6, and 9 mm from the apex. The sections were examined under a stereomicroscope and scored for crack presence. The other half of the specimens (n = 30) were obturated using lateral condensation of gutta-percha and AdSeal sealer (Meta Biomed Co, Ltd, Chungbuk, Korea). The specimens were then subjected to a load of 1 mm/min to determine the force required to fracture the roots. WaveOne instruments induced the least amount of cracks and exhibited greatest resistance to fracture compared with ProTaper F2 files whether used in reciprocating or rotating motions. The alloy from which the material is manufactured is a more important factor determining the dentin damaging potential of single-file instruments than the motion of instrumentation. Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  19. 75 FR 27986 - Electronic Filing System-Web (EFS-Web) Contingency Option

    Science.gov (United States)

    2010-05-19

    ... inventors and other small entity applicants who file their applications electronically via EFS-Web receive a... Internet page ( http://www.uspto.gov/patents/process/file/efs/index.jsp ). The EFS-Web Contingency Option... see http://www.uspto.gov/ebc/portal/efs/sb130_instructions.doc ); 9. Petitions to accept an...

  20. SU-E-T-99: Design and Development of Isocenter Parameter System for CT Simulation Laser Based On DICOM RT

    Energy Technology Data Exchange (ETDEWEB)

    Luo, G [Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China (China)

    2014-06-01

    Purpose: In order to receive DICOM files from treatment planning system and generate patient isocenter positioning parameter file for CT laser system automatically, this paper presents a method for communication with treatment planning system and calculation of isocenter parameter for each radiation field. Methods: Coordinate transformation and laser positioning file formats were analyzed, isocenter parameter was calculated via data from DICOM CT Data and DICOM RTPLAN file. An in-house software-DicomGenie was developed based on the object-oriented program platform-Qt with DCMTK SDK (Germany OFFIS company DICOM SDK) . DicomGenie was tested for accuracy using Philips CT simulation plan system (Tumor LOC, Philips) and A2J CT positioning laser system (Thorigny Sur Marne, France). Results: DicomGenie successfully established DICOM communication between treatment planning system, DICOM files were received by DicomGenie and patient laser isocenter information was generated accurately. Patient laser parameter data files can be used for for CT laser system directly. Conclusion: In-house software DicomGenie received and extracted DICOM data, isocenter laser positioning data files were created by DicomGenie and can be use for A2J laser positioning system.

  1. Parallel checksumming of data chunks of a shared data object using a log-structured file system

    Science.gov (United States)

    Bent, John M.; Faibish, Sorin; Grider, Gary

    2016-09-06

    Checksum values are generated and used to verify the data integrity. A client executing in a parallel computing system stores a data chunk to a shared data object on a storage node in the parallel computing system. The client determines a checksum value for the data chunk; and provides the checksum value with the data chunk to the storage node that stores the shared object. The data chunk can be stored on the storage node with the corresponding checksum value as part of the shared object. The storage node may be part of a Parallel Log-Structured File System (PLFS), and the client may comprise, for example, a Log-Structured File System client on a compute node or burst buffer. The checksum value can be evaluated when the data chunk is read from the storage node to verify the integrity of the data that is read.

  2. NDSI products system based on Hadoop platform

    Science.gov (United States)

    Zhou, Yan; Jiang, He; Yang, Xiaoxia; Geng, Erhui

    2015-12-01

    Snow is solid state of water resources on earth, and plays an important role in human life. Satellite remote sensing is significant in snow extraction with the advantages of cyclical, macro, comprehensiveness, objectivity, timeliness. With the continuous development of remote sensing technology, remote sensing data access to the trend of multiple platforms, multiple sensors and multiple perspectives. At the same time, in view of the remote sensing data of compute-intensive applications demand increase gradually. However, current the producing system of remote sensing products is in a serial mode, and this kind of production system is used for professional remote sensing researchers mostly, and production systems achieving automatic or semi-automatic production are relatively less. Facing massive remote sensing data, the traditional serial mode producing system with its low efficiency has been difficult to meet the requirements of mass data timely and efficient processing. In order to effectively improve the production efficiency of NDSI products, meet the demand of large-scale remote sensing data processed timely and efficiently, this paper build NDSI products production system based on Hadoop platform, and the system mainly includes the remote sensing image management module, NDSI production module, and system service module. Main research contents and results including: (1)The remote sensing image management module: includes image import and image metadata management two parts. Import mass basis IRS images and NDSI product images (the system performing the production task output) into HDFS file system; At the same time, read the corresponding orbit ranks number, maximum/minimum longitude and latitude, product date, HDFS storage path, Hadoop task ID (NDSI products), and other metadata information, and then create thumbnails, and unique ID number for each record distribution, import it into base/product image metadata database. (2)NDSI production module: includes

  3. Image-based fingerprint verification system using LabVIEW

    Directory of Open Access Journals (Sweden)

    Sunil K. Singla

    2008-09-01

    Full Text Available Biometric-based identification/verification systems provide a solution to the security concerns in the modern world where machine is replacing human in every aspect of life. Fingerprints, because of their uniqueness, are the most widely used and highly accepted biometrics. Fingerprint biometric systems are either minutiae-based or pattern learning (image based. The minutiae-based algorithm depends upon the local discontinuities in the ridge flow pattern and are used when template size is important while image-based matching algorithm uses both the micro and macro feature of a fingerprint and is used if fast response is required. In the present paper an image-based fingerprint verification system is discussed. The proposed method uses a learning phase, which is not present in conventional image-based systems. The learning phase uses pseudo random sub-sampling, which reduces the number of comparisons needed in the matching stage. This system has been developed using LabVIEW (Laboratory Virtual Instrument Engineering Workbench toolbox version 6i. The availability of datalog files in LabVIEW makes it one of the most promising candidates for its usage as a database. Datalog files can access and manipulate data and complex data structures quickly and easily. It makes writing and reading much faster. After extensive experimentation involving a large number of samples and different learning sizes, high accuracy with learning image size of 100 100 and a threshold value of 700 (1000 being the perfect match has been achieved.

  4. Novel definition files for human GeneChips based on GeneAnnot

    Directory of Open Access Journals (Sweden)

    Ferrari Sergio

    2007-11-01

    Full Text Available Abstract Background Improvements in genome sequence annotation revealed discrepancies in the original probeset/gene assignment in Affymetrix microarray and the existence of differences between annotations and effective alignments of probes and transcription products. In the current generation of Affymetrix human GeneChips, most probesets include probes matching transcripts from more than one gene and probes which do not match any transcribed sequence. Results We developed a novel set of custom Chip Definition Files (CDF and the corresponding Bioconductor libraries for Affymetrix human GeneChips, based on the information contained in the GeneAnnot database. GeneAnnot-based CDFs are composed of unique custom-probesets, including only probes matching a single gene. Conclusion GeneAnnot-based custom CDFs solve the problem of a reliable reconstruction of expression levels and eliminate the existence of more than one probeset per gene, which often leads to discordant expression signals for the same transcript when gene differential expression is the focus of the analysis. GeneAnnot CDFs are freely distributed and fully compliant with Affymetrix standards and all available software for gene expression analysis. The CDF libraries are available from http://www.xlab.unimo.it/GA_CDF, along with supplementary information (CDF libraries, installation guidelines and R code, CDF statistics, and analysis results.

  5. OTUS - Reactor inventory management system based on ORIGEN2

    Energy Technology Data Exchange (ETDEWEB)

    Poellaenen, R.; Toivonen, H.; Lahtinen, J.; Ilander, T.

    1995-10-01

    ORIGEN2 is a computer code that calculates nuclide composition and other characteristics of nuclear fuel. The use of ORIGEN2 requires good knowledge in reactor physics. However, once the input has been defined for a particular reactor type, the calculations can be easily repeated for any burnup and decay time. This procedure produces large output files that are difficult to handle manually. A new computer code, known as OTUS, was designed to facilitate the postprocessing of the data. OTUS makes use of the inventory files precalculated with ORIGEN2 in a way that enables their versatile treatment for different safety analysis purposes. A data base is created containing a comprehensive set of ORIGEN2 calculations as a function of fuel burnup and decay time. OTUS is a reactor inventory management system for a microcomputer with Windows interface. Four major data operations are available: (1) Build data modifies ORIGEN2 output data into a suitable format, (2) View data enables flexible presentation of the data as such, (3) Different calculations, such as nuclide ratios and hot particle characteristics, can be performed for severe accident analyses, consequence analyses and research purposes, (4) Summary files contain both burnup dependent and decay time dependent inventory information related to the nuclide and the reactor specified. These files can be used for safeguards, radiation monitoring and safety assessment. (orig.) (22 refs., 29 figs.).

  6. Visual system of recovering and combination of information for ENDF (Evaluated Nuclear Data File) format libraries; Sistema visual de recuperacao e combinacao de informacoes para bibliotecas no formato ENDF (Evaluated Nuclear Data File)

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Claudia A.S. Velloso [Centro Tecnico Aeroespacial, Sao Jose dos Campos, SP (Brazil); Corcuera, Raquel A. Paviotti [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil)

    1997-04-01

    This report presents a data information retrieval and merger system for ENDF (Evaluated Nuclear Data File) format libraries, which can be run on personal computers under the Windows {sup TM} environment. The input is the name of an ENDF/B library, which can be chosen in a proper window. The system has a display function which allows the user to visualize the reaction data of a specific nuclide and to produce a printed copy of these data. The system allows the user to retrieve and/or combine evaluated data to create a single file of data in ENDF format, from a number of different files, each of which is in the ENDF format. The user can also create a mini-library from an ENDF/B library. This interactive and easy-to-handle system is a useful tool for Nuclear Data Centers and it is also of interest to nuclear and reactor physics researchers. (author)

  7. SFFS:Low-Latency Small-File-Oriented Distributed File System%SFFS:低延迟的面向小文件的分布式文件系统

    Institute of Scientific and Technical Information of China (English)

    王鲁俊; 龙翔; 吴兴博; 王雷

    2014-01-01

    SNS (social networking services) and E-commerce services developed rapidly. Such services need store numerous small files like pictures, music files and macro blog texts. Traditional distributed storage systems, such as HDFS (Hadoop distributed file system), are designed for large files, which will have problems such as too much over-head with metadata and high latency when dealing with large number of small files. This paper analyzes the architec-ture and read-write flow of TFS (Taobao file system), and finds that TFS has to build several network connections when writing or reading a small file, which increases the read-write latency. Aiming at the challenge of storing numerous small files and the problems of TFS, this paper proposes SFFS (small-file file system), a low-latency high availability small-file-oriented distributed storage. The performance experiments show that the write latency of SFFS decreases 76.6%, and the read latency of SFFS decreases about 10%compared with TFS. SFFS also has a higher availability than TFS since the center node in SFFS has lighter load and can recover more quickly.%社交网站和电子商务等网络服务发展迅速,这类服务需要存储大量图片、音乐、微博文本等小文件。传统的分布式存储系统,如HDFS(Hadoop distributed file system),是面向大文件而设计的,在存储小文件时会产生元数据开销过大,访问延迟较高等问题,不能适应存储海量小文件的应用环境。分析了TFS(Taobao file system)的系统架构和读写流程,发现TFS在每次读/写过程中至少要建立3次网络连接,增大了读写延迟。针对海量小文件存储带来的挑战和TFS存在的问题,提出了一种新的低延迟、高可用的面向海量小文件的分布式存储方案,并实现了分布式文件系统SFFS(small-file file system)。性能测试表明,SFFS和TFS相比,写延迟降低了76.6%,读延迟降低了约10%。通过对系统结

  8. SU-E-T-576: Evaluation of Patient Specific VMAT QA Using Dynalog Files and Treatment Planning System

    Energy Technology Data Exchange (ETDEWEB)

    Defoor, D; Stathakis, S; Mavroidis, P; Papanikolaou, N [University of Texas Health Science Center, UTHSCSA, San Antonio, TX (United States)

    2014-06-01

    Purpose: This research investigates the use of Mult-ileaf Collimator (MLC) dynalog files to modify a Volumetric Arc Therapy (VMAT) DICOM Radiotherapy Treatment file from the Treatment Planning System (TPS) for quality assurance and treatment plan verification. Methods: Actual MLC positions and gantry angles where retrieved from the MLC Dynalog files of an approved and treated VMAT plan. The treatment machine used was a Novalis TX linac equipped with high definition MLC. The DICOM RT file of the plan was exported from the TPS (Eclipse, Varian Medical Systems) and the actual MLC leaf positions and gantry angles were inserted in place of the planned positions for each control point. The modified DICOM RT file was then imported back into the TPS where dose calculations were performed. The resulting dose distributions were then exported to VeriSoft (PTW) where a 3D gamma was calculated using 3mm-3% and 2mm-2% criteria. A 2D gamma was also calculated using dose measurements on the Delta4 (Sandidose) phantom. Results: A 3D gamma was calculated in Verisoft at 3mm-3% of 99.5% and at 2mm-2% of 99.2%. The pretreatment verification on the Delta4 yielded a 2D gamma at 3mm-3% of 97.9% and at 2mm-2% of 88.5%. The dose volume histograms of the approved plan and the dynalog plan are virtually identical. Conclusion: Initial results show good agreement of the dynalog dose distribution with the approved plan. Future work on this research will aim to increase the number of patients and replace the planned fractionated dose per control point with the actual fractionated dose.

  9. The Design and Implementation of Teacher’s Professional File Management System Based on ASP.NET Technology%基于ASP.NET技术的教师业务档案管理系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    王海峰

    2013-01-01

    为克服手工操作易发生数据丢失和统计出错的不足,提高教师业务档案管理的效能,在深入进行需求分析的基础上,基于ASP.NET技术,设计开发了高校教师业务档案管理系统,并实现了在线日常管理、查询和统计等主要功能。%This paper designs and develops the teacher’s professional file management system by the ASP. NET technology,and that implements the functions of online daily management, inquiry, statistics in order to overcome the data loss and statistical error of manual operation and to improve the effectiveness of the man-agement of the teacher’s professional file on the basis of in-depth requirements analysis.

  10. Studying Sensing-Based Systems

    DEFF Research Database (Denmark)

    Kjærgaard, Mikkel Baun

    2013-01-01

    Recent sensing-based systems involve a multitude of users, devices, and places. These types of systems challenge existing approaches for conducting valid system evaluations. Here, the author discusses such evaluation challenges and revisits existing system evaluation methodologies....

  11. Object-based Storage Integration within the ATLAS DDM system

    CERN Document Server

    Garonne, Vincent; The ATLAS collaboration

    2016-01-01

    In this paper, we'll talk about our experiences with different data storage technologies within the ATLAS Distributed Data Management system, and in particular about object-based storage. Object-based storage differs in many points from traditional file system storage and offers a highly scalable, simple and most common storage solution for the cloud. First, we describe the needed changes in the Rucio software to integrate this technology, then we present for which use cases we have evaluated them. Finally, we conclude by reporting the results, performances and the potential future by exploiting more of their specificities and features, like metadata support.

  12. 48 CFR 1404.802 - Contract files.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Contract files. 1404.802 Section 1404.802 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR GENERAL ADMINISTRATIVE MATTERS Contract Files 1404.802 Contract files. In addition to the requirements in FAR 4.802, files...

  13. Changing an automated drug inventory control system to a data base design.

    Science.gov (United States)

    Bradish, R A

    1982-09-01

    A pharmacy department's change from indexed sequential access files to a data base management system (DBMS) for purposes of automated inventory control is described. The DBMS has three main functional areas: (1) inventory ordering and accountability, (2) charging of interdepartmental and intradepartmental orders, and (3) data manipulation with report design for management control. There are seven files directly related to the inventory ordering and accountability area. Each record can be accessed directly or through another file. Information on the quantity of a drug on hand, drug(s) supplied by a specific vendor, status of a purchase order, or calculation of an estimated order quantity can be retrieved quickly. In the drug master file, two records contain a reorder point and safety-stock level that are determined by searching the entries in the order history file and vendor master file. The intradepartmental and interdepartmental orders section contains five files assigned to record and store information on drug distribution. All items removed from the stockroom and distributed are recorded, and reports can be generated for itemized bills, total cost by area, and as formatted files for the accounts payable department. The design, development, and implementation of the DBMS took approximately a year using a part-time pharmacist and minimal outside help, while the previous system required constant expensive help of a programmer/analyst. The DBMS has given the pharmacy department a flexible inventory management system with increased drug control, decreased operating expenses, increased use of department personnel, and the ability to develop and enhance other systems.

  14. 77 FR 16220 - Spartanburg Water System; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2012-03-20

    ...'s existing tailrace; (6) a 1,100-foot-long, 4.16 kilo-volt (KV) transmission line to; (7) a proposed... 4.36. Comments, motions to intervene, notices of intent, and competing applications may be filed...

  15. Moon base reactor system

    Science.gov (United States)

    Chavez, H.; Flores, J.; Nguyen, M.; Carsen, K.

    1989-01-01

    The objective of our reactor design is to supply a lunar-based research facility with 20 MW(e). The fundamental layout of this lunar-based system includes the reactor, power conversion devices, and a radiator. The additional aim of this reactor is a longevity of 12 to 15 years. The reactor is a liquid metal fast breeder that has a breeding ratio very close to 1.0. The geometry of the core is cylindrical. The metallic fuel rods are of beryllium oxide enriched with varying degrees of uranium, with a beryllium core reflector. The liquid metal coolant chosen was natural lithium. After the liquid metal coolant leaves the reactor, it goes directly into the power conversion devices. The power conversion devices are Stirling engines. The heated coolant acts as a hot reservoir to the device. It then enters the radiator to be cooled and reenters the Stirling engine acting as a cold reservoir. The engines' operating fluid is helium, a highly conductive gas. These Stirling engines are hermetically sealed. Although natural lithium produces a lower breeding ratio, it does have a larger temperature range than sodium. It is also corrosive to steel. This is why the container material must be carefully chosen. One option is to use an expensive alloy of cerbium and zirconium. The radiator must be made of a highly conductive material whose melting point temperature is not exceeded in the reactor and whose structural strength can withstand meteor showers.

  16. An image based information system - Architecture for correlating satellite and topological data bases

    Science.gov (United States)

    Bryant, N. A.; Zobrist, A. L.

    1978-01-01

    The paper describes the development of an image based information system and its use to process a Landsat thematic map showing land use or land cover in conjunction with a census tract polygon file to produce a tabulation of land use acreages per census tract. The system permits the efficient cross-tabulation of two or more geo-coded data sets, thereby setting the stage for the practical implementation of models of diffusion processes or cellular transformation. Characteristics of geographic information systems are considered, and functional requirements, such as data management, geocoding, image data management, and data analysis are discussed. The system is described, and the potentialities of its use are examined.

  17. Fuzzy Rule Base System for Software Classification

    Directory of Open Access Journals (Sweden)

    Adnan Shaout

    2013-07-01

    Full Text Available Given the central role that software development plays in the delivery and application of informationtechnology, managers have been focusing on process improvement in the software development area. Thisimprovement has increased the demand for software measures, or metrics to manage the process. Thismetrics provide a quantitative basis for the development and validation of models during the softwaredevelopment process. In this paper a fuzzy rule-based system will be developed to classify java applicationsusing object oriented metrics. The system will contain the following features:Automated method to extract the OO metrics from the source code,Default/base set of rules that can be easily configured via XML file so companies, developers, teamleaders,etc, can modify the set of rules according to their needs,Implementation of a framework so new metrics, fuzzy sets and fuzzy rules can be added or removeddepending on the needs of the end user,General classification of the software application and fine-grained classification of the java classesbased on OO metrics, andTwo interfaces are provided for the system: GUI and command.

  18. USGS Small-scale Dataset - 1:1,000,000-Scale Core Based Statistical Areas 201309 FileGDB 10.1

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This map layer portrays Core Based Statistical Areas in the United States and Puerto Rico. The map layer was created from the CENSUS 2010 TIGER/Line files produced...

  19. A humming retrieval system based on music fingerprint

    Science.gov (United States)

    Han, Xingkai; Cao, Baiyu

    2011-10-01

    In this paper, we proposed an improved music information retrieval method utilizing the music fingerprint. The goal of this method is to represent the music with compressed musical information. Based on the selected MIDI files, which are generated automatically as our music target database, we evaluate the accuracy, effectiveness, and efficiency of this method. In this research we not only extract the feature sequence, which can represent the file effectively, from the query and melody database, but also make it possible for retrieving the results in an innovative way. We investigate on the influence of noise to the performance of our system. As experimental result shows, the retrieval accuracy arriving at up to91% without noise is pretty well

  20. 混合P2P海量小文件元数据模型研究与实现%Hybrid P2P Based Metadata Model for Massive Small File

    Institute of Scientific and Technical Information of China (English)

    金澜涛; 黄志球

    2013-01-01

    The massive requirement of data storage brings a great challenge to traditional mode. Most cluster/distributed file systems are designed to manage large files and suffers a performance penalty while managing a large amount of small files. This paper proposes a massive small file metadata management model based on the features of a hybrid P2P structure with some backup super peers. And its optimiza tion of small files is universal. Finally, a prototype system for testing is implemented and a high performance in small file I/O is obtained.%数据的海量存储需求对传统数据存储模式带来了巨大的挑战.目前大多数集群/分布式文件系统都被设计用来管理大文件.当在处理海量的小文件时,这些文件系统并不具有良好的性能表现.论文提出了一种面向海量小文件的元数据模型,该模型是基于具有超级节点的混合P2P拓扑结构,对小文件的优化管理具有一定的普适性.通过测试对比发现,在小文件读写性能上有数量级的提升.

  1. Semantic File Annotation and Retrieval on Mobile Devices

    Directory of Open Access Journals (Sweden)

    Sadaqat Jan

    2011-01-01

    Full Text Available The rapid development of mobile technologies has facilitated users to generate and store files on mobile devices such as mobile phones and PDAs. However, it has become a challenging issue for users to efficiently and effectively search for files of interest in a mobile environment involving a large number of mobile nodes. This paper presents SemFARM framework which facilitates users to publish, annotate and retrieve files which are geographically distributed in a mobile network enabled by Bluetooth. The SemFARM framework is built on semantic web technologies in support of file retrieval on low-end mobile devices. A generic ontology is developed which defines a number of keywords, their possible domains and properties. Based on semantic reasoning, similarity degrees are computed to match user queries with published file descriptions. The SemFARM prototype is implemented using the Java mobile platform (J2ME. The performance of SemFARM is evaluated from a number of aspects in comparison with traditional mobile file systems and enhanced alternatives. Experimental results are encouraging showing the effectiveness of SemFARM in file retrieval. We can conclude that the use of semantic web technologies have facilitated file retrieval in mobile computing environments maximizing user satisfaction in searching for files of interest.

  2. User's guide for MODTOOLS: Computer programs for translating data of MODFLOW and MODPATH into geographic information system files

    Science.gov (United States)

    Orzol, Leonard L.

    1997-01-01

    MODTOOLS is a set of computer programs for translating data of the ground-water model, MODFLOW, and the particle-tracker, MODPATH, into a Geographic Information System (GIS). MODTOOLS translates data into a GIS software called ARC/INFO. MODFLOW is the recognized name for the U.S. Geological Survey Modular Three-Dimensional Finite-Difference Ground-Water Model. MODTOOLS uses the data arrays input to or output by MODFLOW during a ground-water flow simulation to construct several types of GIS output files. MODTOOLS can also be used to translate data from MODPATH into GIS files. MODPATH and its companion program, MODPATH-PLOT, are collectively called the U.S. Geological Survey Three-Dimensional Particle Tracking Post-Processing Programs. MODPATH is used to calculate ground-water flow paths using the results of MODFLOW and MODPATH-PLOT can be used to display the flow paths in various ways.

  3. Capability-based computer systems

    CERN Document Server

    Levy, Henry M

    2014-01-01

    Capability-Based Computer Systems focuses on computer programs and their capabilities. The text first elaborates capability- and object-based system concepts, including capability-based systems, object-based approach, and summary. The book then describes early descriptor architectures and explains the Burroughs B5000, Rice University Computer, and Basic Language Machine. The text also focuses on early capability architectures. Dennis and Van Horn's Supervisor; CAL-TSS System; MIT PDP-1 Timesharing System; and Chicago Magic Number Machine are discussed. The book then describes Plessey System 25

  4. 一种基于 UPnP的多媒体文件共享方法%A MULTIMEDIA FILES SHARING METHOD BASED ON UPnP

    Institute of Scientific and Technical Information of China (English)

    孙新童; 孙鹏; 郭志川; 张武

    2015-01-01

    Nowadays, the interconnection between devices in digital home becomes a hot research topic.Aiming at the problems of multi-media files sharing between embedded intelligent terminals, we proposed a UPnP device model-based multimedia files sharing method.First, we studied the working principle of UPnP technology, and analysed its protocol stack and working process.Then, we introduced in detail the architecture design and module implementation of the system, and presented the analysis of application process.At last, in home network en-vironment the verification is tested.Furthermore, in order to guarantee the security of the sharing multimedia files, we proposed an access control strategy which is based on UUID and user selection, and validated its feasibility in practical application.%当前数字家庭中设备间的互联互通成为研究热点。针对嵌入式智能设备间的多媒体文件共享问题,提出一种基于UPnP ( Universal Plug and Play)设备模型的多媒体文件共享方法。首先研究UPnP技术的工作原理,分析其协议栈和工作流程,然后详细介绍系统的架构设计和模块实现,并给出应用流程分析,最后在家庭网络环境下进行测试验证。此外,为保证多媒体共享文件的安全性,提出一种基于UUID和用户选择的访问控制策略,并在实际系统中验证了该策略的有效性。

  5. Titanium-II: an evaluated nuclear data file. [E < 20. 0 MeV

    Energy Technology Data Exchange (ETDEWEB)

    Philis, C.; Howerton, R.; Smith, A.B.

    1977-06-01

    A comprehensive evaluated nuclear data file for elemental titanium is outlined including definition of the data base, the evaluation procedures and judgments, and the final evaluated results. The file describes all significant neutron-induced reactions with elemental titanium and the associated photon-production processes to incident neutron energies of 20.0 MeV. In addition, isotopic-reaction files, consistent with the elemental file, are separately defined for those processes which are important to applied considerations of material-damage and neutron-dosimetry. The file is formulated in the ENDF format. This report formally documents the evaluation and, together with the numerical file, is submitted for consideration as a part of the ENDF/B-V evaluated file system. 20 figures, 9 tables.

  6. Intelligence-based systems engineering

    CERN Document Server

    Tolk, Andreas

    2011-01-01

    The International Council on Systems Engineering (INCOSE) defines Systems Engineering as an interdisciplinary approach and means to enable the realization of successful systems. Researchers are using intelligence-based techniques to support the practices of systems engineering in an innovative way. This research volume includes a selection of contributions by subject experts to design better systems.

  7. Analysis and Design of Access Control in Network File System for IMA System%面向IMA的网络文件系统访问控制分析与设计

    Institute of Scientific and Technical Information of China (English)

    段海军; 叶宏; 雷清; 郭勇; 张鹏

    2011-01-01

    In order to solve the problem of access control in network file system for IMA system, we analyse access control and put forward a design scheme of access control. We use the Network File Lock to realize multiple partitions mutually exclusive access to remote files by locking files and unlocking files. We use the module of access control to authenticate the rights of the user. The user can access to files only if through verification. Log files save the whole operation process of accessing remote files. The paper draws principle of network file lock and purview control and modular of log.%为了解决面向IMA的网络文件系统访问控制问题,分析了其中的访问控制,并提出一种访问控制的设计方案.采用网络文件锁,通过对文件的上锁和解锁,实现多个分区互斥访问远程文件;使用权限控制模块验证用户对文件的访问权限,用户通过验证后才能访问文件;日志文件记录整个访问远程文件的过程.给出了网络文件锁、权限控制和日志模块的工作原理.

  8. Environmental fate data base (ENVIROFATE): environmental fate data (DATALOG), June 1988. Data file

    Energy Technology Data Exchange (ETDEWEB)

    Boethling, R.

    1988-06-01

    DATALOG is a bibliographic pointer file of environmental fate data and each record contains a chemical CAS registry number (9 bytes), one of 18 data types (9 bytes), and a reference number (6 bytes) to the full citation in the XREF file. The data types identify physical properties, degradation and transport studies, and food, occupational and ambient monitoring data. The file should be used with CASLST (in order to link the full reference citation). A list of possible data types and their abbreviations are: Adsorption (ADSORP), Bioconcentration (BIOCON), Biodegradation (BIODEG), Dissociation constant (DISS CON), Ecosystem (ECOS), Effluent concentrations (EFFL), Evaporation from water (EVAP), Food and crop concentrations (FOOD), Field studies (FIELD), Henry's Law constant (HENRY CON), Hydrolysis (HYDROL), Monitoring (MONIT), Occupational concentrations (OCCUP), Octanol/water partition coefficient (O/W PART), Photoxidation (PHOTOOXID), UV Spectra (UV), Vapor pressure (VP) and Water solubility (WATER SOL).

  9. A Fault—Tolerant File Management Algorithm in Distributed Computer System “THUDS”

    Institute of Scientific and Technical Information of China (English)

    廖先Shi; 金兰

    1989-01-01

    A concurrent control with independent processes from simultaneous access to a critical section is discussed for the case where there are two distinct classes of processes known as readers and writers.The readers can share the file with one another,but the interleaved execution with readers and writers may produce undesirable conflicts.The file management algorithm proposed in this paper is the activity of avoiding these results.This algorithm not only guarantees the consistency and integrity of the shared file,but also supports optimal parallelism.The concept of dynamic virtual queue is introduced and serves the foundation for this algorithm.Our algorithm with its implicit redundancy allows software fault-tolerant technique.

  10. FRPWPS: A Filter Driver and Reverse Proxy Based Web Protection System

    Directory of Open Access Journals (Sweden)

    Qian He

    2012-06-01

    Full Text Available Website attack has seriously affected the owner’s profit and the security of the Internet. In this paper, a Filter Driver and Reverse Proxy based Web Protection System (FRPWPS with a version control-based safe recovery mechanism is proposed. FRPWPS consists of five sub systems including web file monitor, content publish, web reverse proxy, backup and recovery, and monitor center. The file filter driver is used to protect web program files from illegally tampered. The protected websites are run behind a web proxy with intrusion detection function. The backup and recovery subsystem is realized by a FTP protocol. Experiments analyze the functions and costs of FRPWPS, and results show that it can work well and achieve good performance for web protection.

  11. Meant to make a difference, the clinical experience of minimally invasive endodontics with the self-adjusting file system in India.

    Science.gov (United States)

    Pawar, Ajinkya M; Pawar, Mansing G; Kokate, Sharad R

    2014-01-01

    The vital steps in any endodontic treatment are thorough mechanical shaping and chemical cleaning followed by obtaining a fluid tight impervious seal by an inert obturating material. For the past two decades, introduction and use of rotary nickel-titanium (Ni-Ti) files have changed our concepts of endodontic treatment from conventional to contemporary. They have reported good success rates, but still have many drawbacks. The Self-Adjusting File (SAF) introduces a new era in endodontics by performing the vital steps of shaping and cleaning simultaneously. The SAF is a hollow file in design that adapts itself three-dimensionally to the root canal and is a single file system, made up of Ni-Ti lattice. The case series presented in the paper report the clinical experience, while treating primary endodontic cases with the SAF system in India.

  12. Meant to make a difference, the clinical experience of minimally invasive endodontics with the self-adjusting file system in India

    Directory of Open Access Journals (Sweden)

    Ajinkya M Pawar

    2014-01-01

    Full Text Available The vital steps in any endodontic treatment are thorough mechanical shaping and chemical cleaning followed by obtaining a fluid tight impervious seal by an inert obturating material. For the past two decades, introduction and use of rotary nickel-titanium (Ni-Ti files have changed our concepts of endodontic treatment from conventional to contemporary. They have reported good success rates, but still have many drawbacks. The Self-Adjusting File (SAF introduces a new era in endodontics by performing the vital steps of shaping and cleaning simultaneously. The SAF is a hollow file in design that adapts itself three-dimensionally to the root canal and is a single file system, made up of Ni-Ti lattice. The case series presented in the paper report the clinical experience, while treating primary endodontic cases with the SAF system in India.

  13. The Study of RAR File Analysis method in Teaching Resources Based on WEB%教学资源RAR文件WEB解析方法的研究

    Institute of Scientific and Technical Information of China (English)

    张剑平; 周杰; 罗秋敏

    2014-01-01

    This article analysis’s the RAR file for helping reader to know the content of the file in the WEB site.And then,reader can get the best needed file in the RAR file in the shortest time.This article gives the method,which can outspread the structure of the RAR file by WEB table mode,and the Reader can select the son file and download it first,not all of the RAR file.This method is used in“ System of Book Attached CD distributed on WEB ”and works well.%本文通过WEB方式,对压缩文件进行分析,以帮助教师和学生了解压缩文件的内容,并对该文件的内容进行选择性下载,尽可能使教师和学生优先获得最急需的文件。本文通过分析RAR文件结构,将内部文件用递归方式展开为目录结构,以WEB的TABLE表的形式模拟将其展示,最后可以通过WEB获得部分文件的方法。

  14. Study & Realization of the Real Time File Mirroring System%实时文件镜像系统的研究与实现

    Institute of Scientific and Technical Information of China (English)

    丁原; 刘玉树; 朱天焕

    2001-01-01

    By designing the scheme to construct a real-time file mirroring system, the article studies the key technologies in the construction process. The system is constructed in the Windows NT/Windows 2000 environment. Together with the cluster server system, it can be used as a disaster recovery system.

  15. Patient Treatment File (PTF)

    Data.gov (United States)

    Department of Veterans Affairs — This database is part of the National Medical Information System (NMIS). The Patient Treatment File (PTF) contains a record for each inpatient care episode provided...

  16. Massive Storage Oriented File System Evaluation Benchmark%面向海量存储的文件系统评测基准

    Institute of Scientific and Technical Information of China (English)

    李鑫; 李战怀; 张晓

    2011-01-01

    In order to meet file system level performance evaluation needs of massive storage system, a general file system benchmark conforming to POSIX.l is developed. It provides an effective method to evaluate different file systems. It also offers reliable data to the developers who use POSIX. 1 file system API to design applications. With the cluster test structure, Lzpack can make precise evaluations of file I/O performance and file system metadata operation performance. This paper not only makes clear descriptions of the system structure and key features of Lzpack, but also analyzes the results from tests in different file systems under the application of Lzpack. It puts forward the train of thought on improvement of Lzpack in later stage.%为满足海量存储文件系统级性能评测需求,开发一个通用的符合POSIX.I标准的文件系统基准评测工具LZpack,可为不同文件系统的性能评测比较提供一种有效的方法,也可为使用文件系统操作API集合的应用程序设计者提供性能评价的依据.LZpack采用集群评测的评测架构,可以对文件I/O性能及元数据操作性能进行准确评测.对LZpack的系统结构和关键问题进行描述,对使用LZpack在不同文件系统上的测试结果进行分析,提出LZpack下一步的改进思路.

  17. Emulation Based Performance Investigation of FTP File Downloads over UMTS Dedicated Channels

    DEFF Research Database (Denmark)

    Teyeb, Oumer; Boussif, Malek; Sørensen, Troels Bundgaard;

    2005-01-01

    that determine the workings of this reliability scheme. In this paper, the impact of some of these schemes and parameters on the performance of FTP file downloads is investigated. The investigations are carried out using a real time emulation platform, which makes the results from this study more realistic than...

  18. 78 FR 16365 - Foreign Trade Regulations: Mandatory Automated Export System Filing for All Shipments Requiring...

    Science.gov (United States)

    2013-03-14

    ... national interest. In August 2003, the Census Bureau, in agreement with U.S. Customs and Border Protection... and CBP plan to continue the moratorium on accepting new applications pending the development of a... the equipment number may not be available at the time of filing and as a result would create a...

  19. 日志文件系统在嵌入式存储设备上的实现%The Implementation of Journaling File System on Embedded Memory Device

    Institute of Scientific and Technical Information of China (English)

    郑良辰; 孙玉芳

    2002-01-01

    In embedded systems,unexpected power-off often causes the corruption of the file system and the lose of data.It is necessary to develop a special kind of file system to prevent such corruption.As a kind of journaling file system specially for embedded memory devices,JFFS is just the files system we need.In order to make use of JFFS more extensively,Redfiag Software Ltd.Co.has successfully soved the problem about JFFS'''''''' implementation on DiskOnChip,a special kind of embedded memory device.This paper mostly discusses the design of JFFS and its implementation on DiskOnChip.

  20. NetCDF based data archiving system applied to ITER Fast Plant System Control prototype

    Energy Technology Data Exchange (ETDEWEB)

    Castro, R., E-mail: rodrigo.castro@visite.es [Asociacion EURATOM/CIEMAT para Fusion, Madrid (Spain); Vega, J. [Asociacion EURATOM/CIEMAT para Fusion, Madrid (Spain); Ruiz, M.; De Arcas, G.; Barrera, E.; Lopez, J.M.; Sanz, D. [Grupo de Investigacion en Instrumentacion y Acustica Aplicada, UPM, Madrid (Spain); Goncalves, B.; Santos, B. [Associacao EURATOM/IST, IPFN - Laboratorio Associado, IST, Lisboa (Portugal); Utzel, N.; Makijarvi, P. [ITER Organization, St. Paul lez Durance Cedex (France)

    2012-12-15

    Highlights: Black-Right-Pointing-Pointer Implementation of a data archiving solution for a Fast Plant System Controller (FPSC) for ITER CODAC. Black-Right-Pointing-Pointer Data archiving solution based on scientific NetCDF-4 file format and Lustre storage clustering. Black-Right-Pointing-Pointer EPICS control based solution. Black-Right-Pointing-Pointer Tests results and detailed analysis of using NetCDF-4 and clustering technologies on fast acquisition data archiving. - Abstract: EURATOM/CIEMAT and Technical University of Madrid (UPM) have been involved in the development of a FPSC (Fast Plant System Control) prototype for ITER, based on PXIe (PCI eXtensions for Instrumentation). One of the main focuses of this project has been data acquisition and all the related issues, including scientific data archiving. Additionally, a new data archiving solution has been developed to demonstrate the obtainable performances and possible bottlenecks of scientific data archiving in Fast Plant System Control. The presented system implements a fault tolerant architecture over a GEthernet network where FPSC data are reliably archived on remote, while remaining accessible to be redistributed, within the duration of a pulse. The storing service is supported by a clustering solution to guaranty scalability, so that FPSC management and configuration may be simplified, and a unique view of all archived data provided. All the involved components have been integrated under EPICS (Experimental Physics and Industrial Control System), implementing in each case the necessary extensions, state machines and configuration process variables. The prototyped solution is based on the NetCDF-4 (Network Common Data Format) file format in order to incorporate important features, such as scientific data models support, huge size files management, platform independent codification, or single-writer/multiple-readers concurrency. In this contribution, a complete description of the above mentioned solution

  1. File access prediction using neural networks.

    Science.gov (United States)

    Patra, Prashanta Kumar; Sahu, Muktikanta; Mohapatra, Subasish; Samantray, Ronak Kumar

    2010-06-01

    One of the most vexing issues in design of a high-speed computer is the wide gap of access times between the memory and the disk. To solve this problem, static file access predictors have been used. In this paper, we propose dynamic file access predictors using neural networks to significantly improve upon the accuracy, success-per-reference, and effective-success-rate-per-reference by using neural-network-based file access predictor with proper tuning. In particular, we verified that the incorrect prediction has been reduced from 53.11% to 43.63% for the proposed neural network prediction method with a standard configuration than the recent popularity (RP) method. With manual tuning for each trace, we are able to improve upon the misprediction rate and effective-success-rate-per-reference using a standard configuration. Simulations on distributed file system (DFS) traces reveal that exact fit radial basis function (RBF) gives better prediction in high end system whereas multilayer perceptron (MLP) trained with Levenberg-Marquardt (LM) backpropagation outperforms in system having good computational capability. Probabilistic and competitive predictors are the most suitable for work stations having limited resources to deal with and the former predictor is more efficient than the latter for servers having maximum system calls. Finally, we conclude that MLP with LM backpropagation algorithm has better success rate of file prediction than those of simple perceptron, last successor, stable successor, and best k out of m predictors.

  2. 一种构建嵌入式Linux根文件系统的方法%A method of building embedded Linux root file system

    Institute of Scientific and Technical Information of China (English)

    刘二钢

    2016-01-01

    根文件系统是构建嵌入式Linux系统的非常重要的组成部分。文中主要以制作Yaffs2根文件系统为例,研究如何使用BusyBox构建嵌入式Linux的根文件系统,包括BusyBox的配置、编译和安装,以及在嵌入式Linux环境下生成根文件系统映像文件的方法。文中所介绍的方法能够成功地在ARM开发板中移植和运行,为嵌入式系统的开发提出了一种简单易行的研究思路。%The root file system is a very important part of building the embedded Linux system. This paper mainly makes Yaffs2 root file system as an example of studying how to use the BusyBox to build embedded Linux root file system, including the BusyBox configuration, compilation and installation, and generates the system image files of root file in the embedded Linux environment. The method introduced in the paper is able to transplant and run successfully in the ARM development board, and puts forward a kind of feasible research ideas for the development of embedded system.

  3. Technology based Education System

    DEFF Research Database (Denmark)

    Kant Hiran, Kamal; Doshi, Ruchi; Henten, Anders

    2016-01-01

    Abstract - Education plays a very important role for the development of the country. Education has multiple dimensions from schooling to higher education and research. In all these domains, there is invariably a need for technology based teaching and learning tools are highly demanded in the acad...

  4. A Gossip-based optimistic replication for efficient delay-sensitive streaming using an interactive middleware support system

    CERN Document Server

    Mavromoustakis, Constandinos X; 10.1109/JSYST.2010.2047172

    2010-01-01

    While sharing resources the efficiency is substantially degraded as a result of the scarceness of availability of the requested resources in a multiclient support manner. These resources are often aggravated by many factors like the temporal constraints for availability or node flooding by the requested replicated file chunks. Thus replicated file chunks should be efficiently disseminated in order to enable resource availability on-demand by the mobile users. This work considers a cross layered middleware support system for efficient delay-sensitive streaming by using each device's connectivity and social interactions in a cross layered manner. The collaborative streaming is achieved through the epidemically replicated file chunk policy which uses a transition-based approach of a chained model of an infectious disease with susceptible, infected, recovered and death states. The Gossip-based stateful model enforces the mobile nodes whether to host a file chunk or not or, when no longer a chunk is needed, to pur...

  5. DATA Act File C Award Financial - Social Security

    Data.gov (United States)

    Social Security Administration — The DATA Act Information Model Schema Reporting Submission Specification File C. File C includes the agency award information from the financial accounting system at...

  6. Massive Financial Reconciliation File Approximate Comparison Model and System%面向大规模金融对账文件的近似比对模型及系统

    Institute of Scientific and Technical Information of China (English)

    尹祥龙; 王伟; 陈煜; 周继恩; 任明; 徐景良; 万鑫明

    2016-01-01

    Focus on TB Level massive financial reconciliations file approximate comparison problem, this paper researched a number of the financial reconciliations file features to enhance the mass data comparing speed in financial sector, and proposed a multi-level approximate comparison model - UpCompare Model. UpCompare Model is a kind of multi-process technology based on hash index table, using fast winning strategy as the core algorithm, effectively solving the massive financial reconciliations file approximate comparison problem. Experimental results show that, by using UpCompare Model, bank transaction settle system efficiency improved more than 5× in daily financial reconciliations file approximate comparison.%针对TB级的大规模金融对账文件的近似比对问题,本文深入分析了金融对账文件的特点,以提升比对速度作为研究目标,提出了一种多层次的近似比对模型—UpCompare模型.UpCompare模型以多进程为扩展基础,采用哈希索引建立映射表结合快速致胜策略为核心算法.测试结果表明,运用UpCompare模型,我国银行卡清算系统的每日清算文件近似比对效率提升了5倍以上.

  7. Web-based support systems

    CERN Document Server

    Yao, JingTao

    2010-01-01

    The emerging interdisciplinary study of Web-based support systems focuses on the theories, technologies and tools for the design and implementation of Web-based systems that support various human activities. This book presents the state-of-the-art in Web-based support systems (WSS). The research on WSS is multidisciplinary and focuses on supporting various human activities in different domains/fields based on computer science, information technology, and Web technology. The main goal is to take the opportunities of the Web, to meet the challenges of the Web, to extend the human physical limita

  8. Research on enormous storage for small files based on distributed indexing and directory aggregation%基于分布式索引和目录聚合的海量小文件存储研究

    Institute of Scientific and Technical Information of China (English)

    马灿; 孟丹; 熊劲

    2012-01-01

    To solve the problem of access to a vast amount of small files created in Web service, a method for managing billions of small files using the hyper virtual file system ( HVFS) , a distributed file system based on distributed indexing and directory aggregation, is proposed to provide both high throughput and low latency file access.The measures of using distributed extendible hash indexing to improve system scalability, using log structure format and columnar storage to exploit temporal and spatial locality in directory aggregation, are also presented.The evaluation indicates that the HVFS can scale linearly and obtain 1 million file creations per second with 82 nodes.Compared to GIGA + , it can improve more than 200% .Compared to the small file I/O performance of OrangeFS, it can improve more than 6000%.%针对海量小文件访问问题的挑战,提出了用基于分布式索引和目录聚合的分布式文件系统——超虚拟文件系统(HVFS)来管理数十亿个小文件的方法,以支持高并发、高吞吐、低延迟的访问.重点讨论了目录索引、目录存储问题,提出了利用可扩展哈希索引来降低延迟、提高扩展性,利用日志结构和列存储的目录聚合来提高吞吐率的方法.测试结果表明,HVFS的存储性能能够线性扩展,82节点上峰值创建速度接近百万每秒,与GIGA+相比有200%以上的提升,小文件I/O性能与OrangeFS相比有60倍以上的提升,充分验证了分布式索引和目录聚合方法的有效性.

  9. 48 CFR 204.802 - Contract files.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Contract files. 204.802 Section 204.802 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE GENERAL ADMINISTRATIVE MATTERS Contract Files 204.802 Contract files. Official...

  10. 78 FR 34362 - Combined Notice of Filings #1

    Science.gov (United States)

    2013-06-07

    ... Fortistar Methane Group Gas Recovery Systems, LLC. Filed Date: 5/23/13. Accession Number: 20130523-5138.... Description: Amendment to Application and Initial Baseline Tariff Filing to be effective 8/1/2013. Filed...

  11. MTA Computer Based Evaluation System.

    Science.gov (United States)

    Brenner, Lisa P.; And Others

    The MTA PLATO-based evaluation system, which has been implemented by a consortium of schools of medical technology, is designed to be general-purpose, modular, data-driven, and interactive, and to accommodate other national and local item banks. The system provides a comprehensive interactive item-banking system in conjunction with online student…

  12. Expert and Knowledge Based Systems.

    Science.gov (United States)

    Demaid, Adrian; Edwards, Lyndon

    1987-01-01

    Discusses the nature and current state of knowledge-based systems and expert systems. Describes an expert system from the viewpoints of a computer programmer and an applications expert. Addresses concerns related to materials selection and forecasts future developments in the teaching of materials engineering. (ML)

  13. MTA Computer Based Evaluation System.

    Science.gov (United States)

    Brenner, Lisa P.; And Others

    The MTA PLATO-based evaluation system, which has been implemented by a consortium of schools of medical technology, is designed to be general-purpose, modular, data-driven, and interactive, and to accommodate other national and local item banks. The system provides a comprehensive interactive item-banking system in conjunction with online student…

  14. Comparison of Postoperative Pain after Root Canal Preparation with Two Reciprocating and Rotary Single-File Systems: A Randomized Clinical Trial

    Science.gov (United States)

    Mollashahi, Narges Farhad; Saberi, Eshagh Ali; Havaei, Seyed Rohollah; Sabeti, Mohammad

    2017-01-01

    Introduction: Root canal preparation techniques may cause postoperative pain. The aim of the present study was to compare the intensity of postoperative pain after endodontic treatment using hand files, single file rotary (OneShape), and single file reciprocating (Reciproc) systems. Methods and Materials: In this single-blind, parallel-grouped randomized clinical trial a total of 150 healthy patients aged between 20 to 50 years old were diagnosed with symptomatic irreversible pulpitis of one maxillary or mandibular molars. The teeth were randomly assigned to three groups according to the root canal instrumentation technique: hand files (control), OneShape and Reciproc. Treatment was performed in a single visit by an endodontist. The severity of the postoperative pain was assessed by the visual analogue scale (VAS) after 6, 12, 24, 48 and 72 h. Data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests. Results: The patients in control group reported significantly higher mean postoperative pain intensity at 12, 24, 48, and 72 h compared to the patients in the two other groups (P0.05). Conclusion: The instrumentation kinematics (single-file reciprocating or single-file rotary) had no impact on intensity of postoperative pain. PMID:28179917

  15. Improved of content-based file type identification algorithm%改进的基于内容的文件类型识别算法

    Institute of Scientific and Technical Information of China (English)

    曹鼎; 罗军勇

    2011-01-01

    On the basis of the content-based file type identification algorithm, both fixed and variable size window are adopted to extract statistic characteristic of files' binary content, which improves feature extraction in current algorithm. Feature selection is introduced into file type identification and a novel evaluation function combing feature width and stability is used for feature selection, which are used to establish models for different file types as standard to determine a tested file type. Our aim is not to use the structure and key words of any specific file types as this allows the approach to be applied to general file types. Experiments show that the proposed approach improves the precision and recall of file type identification.%在现有基于内容的文件类型识别算法基础上,针对统计特征提取方面存在的问题,采用定长和变长窗口对文件二进制内容进行划分,提取文件的统计特征,并提出将特征选择应用于文件类型识别,结合特征的广度和稳定度设计出一种特征选择评估函数选择标志特征,从而建立文件类型模型,以此为标准识别文件类型.该算法不依靠特定文件类型的结构和关键标识,适用范围更为广泛.实验结果表明,该算法能有效提高文件类型的识别查准率和查全率.

  16. 文件系统的快速启动机制研究%Research On Quick Start-up Mechanism of File System

    Institute of Scientific and Technical Information of China (English)

    杨琼; 胡宁; 周霆; 徐晓光

    2014-01-01

    文章提供一种文件系统的快速启动方法,通过设计一种合理的文件系统一致性方案以减少文件系统的完整性检查,且只在合适的时机扫描磁盘以减少磁盘扫描开销有效缩短文件系统启动时间。%This article provides a quick mount method of file system. By designing a rational file system consistency solution to reduce the integrity check of the file system, and only check disk at the right time to reduce disk-check overhead, effectively shortening the mount time.

  17. Efficacy of Two Irrigants Used with Self-Adjusting File System on Smear Layer: A Scanning Electron Microscopy Study.

    Science.gov (United States)

    Genç Şen, Özgür; Kaya, Sadullah; Er, Özgür; Alaçam, Tayfun

    2014-01-01

    Mechanical instrumentation of root canals produces a smear layer that adversely affects the root canal seal. The aim of this study was to evaluate efficacy of MTAD and citric acid solutions used with self-adjusting file (SAF) system on smear layer. Twenty-three single-rooted human teeth were used for the study. Canals were instrumented manually up to a number 20 K file size. SAF was used to prepare the root canals. The following groups were studied: Group 1: MTAD + 5.25% NaOCl, Group 2: 20% citric acid + 5.25% NaOCl, and Group 3: Control (5.25% NaOCl). All roots were split longitudinally and subjected to scanning electron microscopy. The presence of smear layer in the coronal, middle, and apical thirds was evaluated using a five-score evaluation system. Kruskal-Wallis and Mann-Whitney U tests were used for statistical analysis. In the coronal third, Group 2 exhibited the best results and was statistically different froms the other groups (P 0.05). The solutions used in Group 1 and 2 could effectively remove smear layer in most of the specimens. However, citric acid was more effective than MTAD in the three thirds of the canal.

  18. The evaluation of a web-based incident reporting system.

    Science.gov (United States)

    Kuo, Ya-Hui; Lee, Ting-Ting; Mills, Mary Etta; Lin, Kuan-Chia

    2012-07-01

    A Web-based reporting system is essential to report incident events anonymously and confidentially. The purpose of this study was to evaluate a Web-based reporting system in Taiwan. User satisfaction and impact of system use were evaluated through a survey answered by 249 nurses. Incident events reported in paper and electronic systems were collected for comparison purposes. Study variables included system user satisfaction, willingness to report, number of reports, severity of the events, and efficiency of the reporting process. Results revealed that senior nurses were less willing to report events, nurses on internal medicine units had higher satisfaction than others, and lowest satisfaction was related to the time it took to file a report. In addition, the Web-based reporting system was used more often than the paper system. The percentages of events reported were significantly higher in the Web-based system in laboratory, environment/device, and incidents occurring in other units, whereas the proportions of reports involving bedsores and dislocation of endotracheal tubes were decreased. Finally, moderate injury event reporting decreased, whereas minor or minimal injury event reporting increased. The study recommends that the data entry process be simplified and the network system be improved to increase user satisfaction and reporting rates.

  19. C#实现日志文件清除功能%C# Log File Removal Function

    Institute of Scientific and Technical Information of China (English)

    刘德军

    2014-01-01

    The log file is recorded file system operation event, operating system operating system log files, database system data-base, the system log file. The system log file contains a system message files, including kernel, service, an application running on the system. Different log files record different information. This paper aimed at the hospital information system in the application log file long time accumulation leads to the problem of disk space is full, puts forward solving methods specific log file cleared.%日志文件是记录系统操作事件的记录文件,操作系统有操作系统日志文件,数据库系统有数据库系统日志文件。系统日志文件是包含关于系统消息的文件,包括内核、服务、在系统上运行的应用程序等。不同的日志文件记载不同的信息。该文针对医院信息系统应用程序中产生的日志文件长时间积累导致磁盘空间满这一突出问题,提出特定的日志文件清除的解决方法。

  20. Template based parallel checkpointing in a massively parallel computer system

    Science.gov (United States)

    Archer, Charles Jens; Inglett, Todd Alan

    2009-01-13

    A method and apparatus for a template based parallel checkpoint save for a massively parallel super computer system using a parallel variation of the rsync protocol, and network broadcast. In preferred embodiments, the checkpoint data for each node is compared to a template checkpoint file that resides in the storage and that was previously produced. Embodiments herein greatly decrease the amount of data that must be transmitted and stored for faster checkpointing and increased efficiency of the computer system. Embodiments are directed to a parallel computer system with nodes arranged in a cluster with a high speed interconnect that can perform broadcast communication. The checkpoint contains a set of actual small data blocks with their corresponding checksums from all nodes in the system. The data blocks may be compressed using conventional non-lossy data compression algorithms to further reduce the overall checkpoint size.

  1. Solving data-at-rest for the storage and retrieval of files in ad hoc networks

    Science.gov (United States)

    Knobler, Ron; Scheffel, Peter; Williams, Jonathan; Gaj, Kris; Kaps, Jens-Peter

    2013-05-01

    Based on current trends for both military and commercial applications, the use of mobile devices (e.g. smartphones and tablets) is greatly increasing. Several military applications consist of secure peer to peer file sharing without a centralized authority. For these military applications, if one or more of these mobile devices are lost or compromised, sensitive files can be compromised by adversaries, since COTS devices and operating systems are used. Complete system files cannot be stored on a device, since after compromising a device, an adversary can attack the data at rest, and eventually obtain the original file. Also after a device is compromised, the existing peer to peer system devices must still be able to access all system files. McQ has teamed with the Cryptographic Engineering Research Group at George Mason University to develop a custom distributed file sharing system to provide a complete solution to the data at rest problem for resource constrained embedded systems and mobile devices. This innovative approach scales very well to a large number of network devices, without a single point of failure. We have implemented the approach on representative mobile devices as well as developed an extensive system simulator to benchmark expected system performance based on detailed modeling of the network/radio characteristics, CONOPS, and secure distributed file system functionality. The simulator is highly customizable for the purpose of determining expected system performance for other network topologies and CONOPS.

  2. 一种基于LVM和软件RAID5的文件存储改进方案%An Improved Scheme of Server File Storage Based on LVM and Software RAID5

    Institute of Scientific and Technical Information of China (English)

    林斌斌; 叶荣华

    2015-01-01

    Storage virtualization technology offers a convenient management for server storage,but there are also some drawbacks at the same time. When all files are stored in a single logical volume,it may cause the waste of disk space or affect the read and write perform-ance of large files. When the files are stored on multiple logical volume according to their types,a new problem can be the division of storage space,allocating too much space for a logical volume will result in a waste of disk space because logical volume doesn't support shrinking file system online. For the above reasons,design an improved scheme for server storage and a corresponding algorithm for the scheme based on software RAID5 and LVM technology. The algorithm can classify files and make them stored in multiple logical vol-umes,a shared logical volume is added for the rest of the logical volumes,if the logical volume which a file is written to meets the ap-pointed usage rate threshold condition,the file will be moved to the shared logical volume to create or be written,avoiding the waste caused by excessive pre-allocation for a single logical volume. The experimental results show that classified storage for files can improve the reading performance of large files and utilization of storage,this program has a less effect to the response time of small file's writing when the file is in migration situation.%存储虚拟化技术在方便服务器存储管理的同时存在一些弊端,将所有文件存于单个逻辑卷中可能会造成磁盘空间浪费或影响大文件的读写性能,将文件分类存储于多个逻辑卷会涉及存储空间的划分,由于逻辑卷不支持在线缩小文件系统,为某个逻辑卷分配过多空间亦会造成磁盘的浪费。针对上述情况,提出了一种基于LVM和软件RAID5的服务器文件存储改进方案,并设计了相应的算法。算法可对文件进行分类存储于多个逻辑卷,加入一个共享逻辑卷,若文件写

  3. 77 FR 41399 - EC&R O&M, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Science.gov (United States)

    2012-07-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission EC&R O&M, LLC; Supplemental Notice That Initial Market-Based Rate Filing...-referenced proceeding of EC&R O&M, LLC's application for market-based rate authority, with an accompanying...

  4. Research on Log Module of Linux File Access Based on Hook Mechanism%基于Hook机制的Linux文件访问日志模块研究

    Institute of Scientific and Technical Information of China (English)

    李晓丽; 李小红

    2015-01-01

    In view of the current problems of Linux system security audit, designs a file access logging module. When an intruder enters the Linux server system through a user account and tries to modify the file, the system will generate a log file containing the user's information au-tomatically. Through the log file, we can locate the user. Experimental results show that our module is feasible. It can be used for security audit of system file access. On this basis, designs a SMS alarm platform. When the log file is changed, the system will send a message to the administrator and recover the loss in the first time.%针对目前Linux系统安全审计方面的不足,设计一个文件访问日志记录模块,当入侵者通过某用户账户进入Linux服务器系统并尝试修改文件时,系统会自动生成包含用户信息的日志记录文件,通过该日志文件,可以定位该用户. 实验测试结果表明我们的模块是可行的,可以用于系统文件访问的安全审计. 在此基础上进一步设计一个短信报警平台,当日志记录文件发生变化时,可以第一时间给管理员发送短信以挽回损失.

  5. Micro-Based Genlocking Systems.

    Science.gov (United States)

    Hurly, Paul

    1986-01-01

    Presents a selective survey of micro-based genlocking systems currently on the market including those systems with open and closed architecture; examines the number and diversity of uses for this hybrid medium, which synchronizes video signals with computer-generated text and graphics; and discusses the role of cause and effect in innovation.

  6. Parallel compression of data chunks of a shared data object using a log-structured file system

    Science.gov (United States)

    Bent, John M.; Faibish, Sorin; Grider, Gary

    2016-10-25

    Techniques are provided for parallel compression of data chunks being written to a shared object. A client executing on a compute node or a burst buffer node in a parallel computing system stores a data chunk generated by the parallel computing system to a shared data object on a storage node by compressing the data chunk; and providing the data compressed data chunk to the storage node that stores the shared object. The client and storage node may employ Log-Structured File techniques. The compressed data chunk can be de-compressed by the client when the data chunk is read. A storage node stores a data chunk as part of a shared object by receiving a compressed version of the data chunk from a compute node; and storing the compressed version of the data chunk to the shared data object on the storage node.

  7. 基于VC和OpenGL的STL文件的分层和显示%Based on the VC and OpenGL STL File Stranification and Display

    Institute of Scientific and Technical Information of China (English)

    庄云良; 赵东标; 刘凯; 章永年; 陈盛

    2012-01-01

    STL文件是快速成型系统的标准文件类型,广泛应用于数控加工、逆向工程和有限元分析等.详细介绍了STL文件的读取和分层算法,并利用VC++6.0平台结合OpenGL编程技术,实现了STL文件格式的读取、分层算法以及STL模型的三维显示、视角变换、缩放、平移和分层显示等功能.为进一步实现数控系统直接使用STL文件进行加工奠定了基础.%STL (stereo lithography) file is a standard file type of rapid prototyping system, which is widely used in CNC machining, reverse engineering and finite element analysis. The read method of the STL file and the layered algorithm of the model are introduced in this paper. The reading of STL files, the layered algorithm and the functions such as three-dimensional display,perspective transformation, zoom, shift, layered display of the STL model are implemented in VC programming environment combined with OpenGL technology. These functions are laid a foundation to further the realization of the CNC system by u-sing STL file machining.

  8. Structure and Application pf WAV File

    Institute of Scientific and Technical Information of China (English)

    Guo,Xingji

    2005-01-01

    As regards audio digitization, the researcher introduced several computer process means of audio information, and then, presented application patterns based on WAV file after analyzing thoroughly the structure of the widely used WAV File in computer application field.

  9. Solar based hydrogen production systems

    CERN Document Server

    Dincer, Ibrahim

    2013-01-01

    This book provides a comprehensive analysis of various solar based hydrogen production systems. The book covers first-law (energy based) and second-law (exergy based) efficiencies and provides a comprehensive understanding of their implications. It will help minimize the widespread misuse of efficiencies among students and researchers in energy field by using an intuitive and unified approach for defining efficiencies. The book gives a clear understanding of the sustainability and environmental impact analysis of the above systems. The book will be particularly useful for a clear understanding

  10. 基于对象的 OpenXML 复合文件去重方法研究%Object-Based Data De-Duplication Method for OpenXML Compound Files

    Institute of Scientific and Technical Information of China (English)

    阎芳; 李元章; 张全新; 谭毓安

    2015-01-01

    Content defined chunking (CDC) is a prevalent data de‐duplication algorithm for removing redundant data segments in storage systems .Current researches on CDC do not consider the unique content characteristic of different file types ,and they determine chunk boundaries in a random way and apply a single strategy for all the file types .It has been proven that such method is suitable for text and simple contents , and it doesn’t achieve the optimal performance for compound files . Compound file is composed of unstructured data ,usually occupying large storage space and containing multimedia data .Object‐based data de‐duplication is the current most advanced method and is the effective solution for detecting duplicate data for such files .We analyze the content characteristic of OpenXML files and develop an object extraction method .A de‐duplication granularity determining algorithm based on the object structure and distribution is proposed during this process .The purpose is to effectively detect the same objects in a file or between the different files ,and to be effectively de‐duplicated when the file physical layout is changed for compound files . Through the simulation experiments with typical unstructured data collection ,the efficiency is promoted by 10% compared with CDC method in the unstructured data in general .%现有的重复数据删除技术大部分是基于变长分块(content defined chunking ,CDC)算法的,不考虑不同文件类型的内容特征。这种方法以一种随机的方式确定分块边界并应用于所有文件类型,已经证明其非常适合于文本和简单内容,而不适合非结构化数据构成的复合文件。分析了 OpenXML 标准的复合文件属性,给出了对象提取的基本方法,并提出基于对象分布和对象结构的去重粒度确定算法。目的是对于非结构化数据构成的复合文件,有效地检测不同文件中和同一文件不同位置的相同对象,

  11. 分布式文件系统的写性能优化%Write Performance Optimization of Distributed File System

    Institute of Scientific and Technical Information of China (English)

    董晓明; 李小勇; 程煜

    2012-01-01

    BlueOceanis a large-scale distributed storage system based on object storage technology. This paper optimizes write performance from three aspects. Firstly, the paper increases the read and write block size of FUSE to reduce the number of writes from FUSE to client file buffer to improve write performance; Secondly, the thesis applies zero-copy of read and write in the client, to reduce the times of client-side data copy to improve write performance of the system; Thirdly, the paper parallelizes the process of write from application to client file buffer and the process of write from client to data server to improve the write performance.%BlueOcean是基于对象存储技术的大规模分布式存储系统,从3个方面对其写性能进行了优化.一是,增大了FUSE读写块的大小,减少FUSE写客户端文件缓冲区的次数,提高系统的写性能;二是,在客户端实现对读写数据的零拷贝,减少了客户端数据拷贝的次数,提高了系统的写性能;三是,将应用程序写客户端文件缓冲区的过程与客户端写数据服务器的过程并行化,以提高系统的写性能.

  12. ISPE: A knowledge-based system for fluidization studies

    Energy Technology Data Exchange (ETDEWEB)

    Reddy, S.

    1991-01-01

    Chemical engineers use mathematical simulators to design, model, optimize and refine various engineering plants/processes. This procedure requires the following steps: (1) preparation of an input data file according to the format required by the target simulator; (2) excecuting the simulation; and (3) analyzing the results of the simulation to determine if all specified goals'' are satisfied. If the goals are not met, the input data file must be modified and the simulation repeated. This multistep process is continued until satisfactory results are obtained. This research was undertaken to develop a knowledge based system, IPSE (Intelligent Process Simulation Environment), that can enhance the productivity of chemical engineers/modelers by serving as an intelligent assistant to perform a variety tasks related to process simulation. ASPEN, a widely used simulator by the US Department of Energy (DOE) at Morgantown Energy Technology Center (METC) was selected as the target process simulator in the project. IPSE, written in the C language, was developed using a number of knowledge-based programming paradigms: object-oriented knowledge representation that uses inheritance and methods, rulebased inferencing (includes processing and propagation of probabilistic information) and data-driven programming using demons. It was implemented using the knowledge based environment LASER. The relationship of IPSE with the user, ASPEN, LASER and the C language is shown in Figure 1.

  13. Data Sharing in a File Structured QoS Aware Peer-To-Peer System

    Directory of Open Access Journals (Sweden)

    A. Samydurai

    2014-05-01

    Full Text Available The Peer-to-Peer system has the potential capacity in building an efficient unified network structure for location based secure data transfer with information sharing and minimizing the failure factor. In this study we define the data transfer with certain futuristic characters that will provide data sharing strength for the users to understand the efficiency with which the data reaches the end node or users. For this purpose we have used specific QoS metric tools like, bandwidth, lookup time, delay, response time and trip time that will help in data sharing. This study concentrates on the search operation on the P2P network for data retrieval. Replication strategy is used in order to increase the probability of successful search. The lookup search employed in this regard uses two type of search namely ring and binary search. The efficiency aspect of data transfer in this study raises the importance of the system compared with the earlier system. The performance analysis will clearly chat out the quality of this system of data sharing and searching. Evaluations have shown a positive sign in the functioning of the proposed system.

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

    Energy Technology Data Exchange (ETDEWEB)

    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

  15. Immunity Based Worm Detection System

    Institute of Scientific and Technical Information of China (English)

    HONG Zheng; WU Li-fa; WANG Yuan-yuan

    2007-01-01

    Current worm detection methods are unable to detect multi-vector polymorphic worms effectively.Based on negative selection mechanism of the immune system,a local network worm detection system that detects worms was proposed.Normal network service requests were represented by self-strings,and the detection system used self-strings to monitor the network for anomaly.According to the properties of worm propagation,a control center correlated the anomalies detected in the form of binary trees to ensure the accuracy of worm detection.Experiments show the system to be effective in detecting the traditional as well as multi-vector polymorphic worms.

  16. Residue-based Coordinated Selection and Parameter Design of Multiple Power System Stabilizers (PSSs)

    DEFF Research Database (Denmark)

    Su, Chi; Hu, Weihao; Fang, Jiakun

    2013-01-01

    data from time domain simulations. Then a coordinated approach for multiple PSS selection and parameter design based on residue method is proposed and realized in MATLAB m-files. Particle swarm optimization (PSO) is adopted in the coordination process. The IEEE 39-bus New England system model...... as the test system is built in DIgSIELNT PowerFactory 14.0, in which the proposed coordination method is validated by time domain simulations and modal analysis....

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

    Energy Technology Data Exchange (ETDEWEB)

    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

  18. 即时通讯软件文件传输审计系统的研究与实现%Research and implementation of files audit system for instant messenger

    Institute of Scientific and Technical Information of China (English)

    董苹苹; 王建新; 孙志慧; 马宇超

    2012-01-01

    已有的网络行为审计软件没有针对即时通讯软件(IM)的文件传输记录模块.通过搭建协议分析环境,根据主流即时通讯软件通信数据明文传输的特点,利用网络捕包工具,并采用逆推方法,对多种即时通讯软件(IM)(QQ,Fetion,MSN和雅虎通等)文件传输协议进行深入分析,设计并实现一个IM文件传输审计系统(FAudit).FAudit系统基于Libpcap库捕获数据包,提取应用层数据,应用特有的文件重组算法,通过计算网络数据包的ACK和SEQ数,对数据包进行过滤、排序、解压、重组和写入,最后还原出用户传输的文件.测试结果表明:FAudit系统可在不同网络环境特别是网络环境突变、网络状况异常恶劣的情况下,有效地审计各类IM传输的各种类型(DOC,PDF,TXT和视频等)和大小的文件,同时还可解决即时通讯软件版本升级带来的系统升级问题.%Since most network behavior audit software cannot record files sent by instant messenger (IM), based on the exoteric communication data between popular instant messenger client softwares, using sniffer tools, the unopened and non-uniform file transmitting protocols of those software were analyzed in converse way. And a new network behavior audit system (FAudit) was presented on the base of analysis on IMs files transmission protocol. As IMs file packets were captured based on Libpcap database, application layer data was extracted, the ACK number and SEQ number were analyzed, and then the packets were recovered from the original file by filtering ordering, decompression, reassembling and writing. The simulation results show that FAudit can audit all formats of files (such as DOC, PDF, TXT and videos) with arbitrary size in different network environments no matter however bad it is. At the same time FAudit can be extended to other kinds of IMs.

  19. Land Boundary Conditions for the Goddard Earth Observing System Model Version 5 (GEOS-5) Climate Modeling System: Recent Updates and Data File Descriptions

    Science.gov (United States)

    Mahanama, Sarith P.; Koster, Randal D.; Walker, Gregory K.; Takacs, Lawrence L.; Reichle, Rolf H.; De Lannoy, Gabrielle; Liu, Qing; Zhao, Bin; Suarez, Max J.

    2015-01-01

    The Earths land surface boundary conditions in the Goddard Earth Observing System version 5 (GEOS-5) modeling system were updated using recent high spatial and temporal resolution global data products. The updates include: (i) construction of a global 10-arcsec land-ocean lakes-ice mask; (ii) incorporation of a 10-arcsec Globcover 2009 land cover dataset; (iii) implementation of Level 12 Pfafstetter hydrologic catchments; (iv) use of hybridized SRTM global topography data; (v) construction of the HWSDv1.21-STATSGO2 merged global 30 arc second soil mineral and carbon data in conjunction with a highly-refined soil classification system; (vi) production of diffuse visible and near-infrared 8-day MODIS albedo climatologies at 30-arcsec from the period 2001-2011; and (vii) production of the GEOLAND2 and MODIS merged 8-day LAI climatology at 30-arcsec for GEOS-5. The global data sets were preprocessed and used to construct global raster data files for the software (mkCatchParam) that computes parameters on catchment-tiles for various atmospheric grids. The updates also include a few bug fixes in mkCatchParam, as well as changes (improvements in algorithms, etc.) to mkCatchParam that allow it to produce tile-space parameters efficiently for high resolution AGCM grids. The update process also includes the construction of data files describing the vegetation type fractions, soil background albedo, nitrogen deposition and mean annual 2m air temperature to be used with the future Catchment CN model and the global stream channel network to be used with the future global runoff routing model. This report provides detailed descriptions of the data production process and data file format of each updated data set.

  20. SMS BASED REMOTE CONTROL SYSTEM

    Directory of Open Access Journals (Sweden)

    Reecha Ranjan Singh , Sangeeta Agrawal , Saurabh Kapoor ,S. Sharma

    2011-08-01

    Full Text Available A modern world contains varieties of electronic equipment and systems like: TV, security system, Hi-fi equipment, central heating systems, fire alarm systems, security alarm systems, lighting systems, SET Top Box, AC (Air Conditioner etc., we need to handle, ON/OFF or monitor these electrical devices remotely or to communicate with these but, if you are not at the home or that place and you want to communicate with these device. So the new technology for handled these devices remotely and for communication to required the GSM, mobile technology, SMS (short message service and some hardware resources. SMS based remote control for home appliances is beneficial for the human generation, because mobile is most recently used technology nowadays.

  1. 一种非阻塞读文件系统的实现方法%Implementation Method of File System with Non-blocking Read

    Institute of Scientific and Technical Information of China (English)

    熊安萍; 唐巍; 蒋溢

    2011-01-01

    针对现有文件系统在容错性及读性能远低于数据库系统的情况,运用数据库系统中数据的多版本技术实现数据的快速闪回及非阻塞读原理,通过改进文件系统元数据结构及结合写时复制技术的方法,在文件系统中增加文件瞬时恢复功能及非阻塞读功能,解决现有文件系统在容错性不足的问题,提高文件系统的读性能.通过该方法制作MVFS文件系统,测试结果表明,应用该方法生成的文件系统具有优越的读性能、容错性和可靠性.%Focused on the existing file system in the fault-tolerance and reliability are much lower than the database system, this paper uses the principle of data multiple versions technology in database system to achieve quickly flashback and non-blocking read.By improving the meta-data structure of file system and the combination of copy-on-write techniques, this paper solves the problem of existing file system lack of fault tolerance and enhances the read performance of file system.MVFS is made by the method.Experimental results on MVFS show that the method applied to generate the file system posses excellent read performance, fault tolerance and reliability

  2. 48 CFR 1404.805 - Disposal of contract files.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Disposal of contract files. 1404.805 Section 1404.805 Federal Acquisition Regulations System DEPARTMENT OF THE INTERIOR GENERAL ADMINISTRATIVE MATTERS Contract Files 1404.805 Disposal of contract files. Disposition of files shall...

  3. 78 FR 79429 - Combined Notice of Filings #1

    Science.gov (United States)

    2013-12-30

    ... 1000 Compliance Filing to be effective 2/17/2014. Filed Date: 12/18/13. Accession Number: 20131218-5197...: Midcontinent Independent System Operator, Inc. submits 12-16-2013 Entergy IAs Succession Filing Part 1 to be...: Midcontinent Independent System Operator, Inc. submits 12-16-2013 Entergy IAs Succession Filing Part 2 to...

  4. NFC based parking payment system

    Directory of Open Access Journals (Sweden)

    Arun Radhakrishnan

    2015-06-01

    Full Text Available All people want to improve their quality of life and this can be achieved only by technology. Many problems are faced by daily vehicle users in payment based parking systems, both in open air parking system where the parking is done along the streets and in closed parking system where parking is done in closed infrastructure added with entry and exit points. Delays (long queues and accuracy in fares are the main problems faced by the users. Many solutions are proposed to solve this problem but all have their own drawbacks. In this paper a new solution is proposed based on Near Field Communication (NFC which makes the payment system reliable and easy.

  5. A hybrid base isolation system

    Energy Technology Data Exchange (ETDEWEB)

    Hart, G.C. [Univ. of California, Los Angeles, CA (United States); Lobo, R.F.; Srinivasan, M. [Hart Consultant Group, Santa Monica, CA (United States); Asher, J.W. [kpff Engineers, Santa Monica, CA (United States)

    1995-12-01

    This paper proposes a new analysis procedure for hybrid base isolation buildings when considering the displacement response of a base isolated building to wind loads. The system is considered hybrid because of the presence of viscous dampers in the building above the isolator level. The proposed analysis approach incorporates a detailed site specific wind study combined with a dynamic nonlinear analysis of the building response.

  6. Improving the interactivity and functionality of Web-based radiology teaching files with the Java programming language.

    Science.gov (United States)

    Eng, J

    1997-01-01

    Java is a programming language that runs on a "virtual machine" built into World Wide Web (WWW)-browsing programs on multiple hardware platforms. Web pages were developed with Java to enable Web-browsing programs to overlay transparent graphics and text on displayed images so that the user could control the display of labels and annotations on the images, a key feature not available with standard Web pages. This feature was extended to include the presentation of normal radiologic anatomy. Java programming was also used to make Web browsers compatible with the Digital Imaging and Communications in Medicine (DICOM) file format. By enhancing the functionality of Web pages, Java technology should provide greater incentive for using a Web-based approach in the development of radiology teaching material.

  7. The Effect of Nano-Aluminumpowder on the Characteristic of RDX based Aluminized Explosives Underwater Close-Filed Explosion

    Directory of Open Access Journals (Sweden)

    Junting Yin

    2017-01-01

    Full Text Available In order to investigate the effect of nano-aluminum powder on the characteristic of RDX based aluminized explosives underwater closed-filed explosions, the scanning photographs along the radial of the charges were gained by a high speed scanning camera. The photographs of two different aluminized explosives underwater explosion have been analyzed, the shock wave curves and expand curves of detonation products were obtained, furthermore the change rules of shock waves propagation velocity, shock front pressure and expansion of detonation products of two aluminized explosives were investigated, and also the parameters of two aluminized explosives were contrasted. The results show that the aluminized explosive which with nano-aluminum whose initial shock waves pressure propagation velocity, shock front pressure are smaller than the aluminized explosive without nano-aluminum and has lower decrease rate attenuation of energy.

  8. Efficient Writing Mechanism for P2P File System%P2P文件系统的高效写机制

    Institute of Scientific and Technical Information of China (English)

    邱元杰; 刘心松

    2011-01-01

    为了解决P2P文件系统中网络延迟太大和副本数量太多以至写入速度太低问题,提出了基于核心副本集的并行写机制.定义了核心副本集的概念,并详细论述了核心副本集的选择算法.提出了并行写的机制,并给出了机制中写乱序问题、并行度控制问题和写正确性检查问题的解决办法.测试结果表明,核心副本集能够在写的过程中自动选择;在高网络延迟的环境下,其写入速度随并行度增加而提高,且在相同环境下,其写入速度是普通写入机制的6倍.%In P2P file system, writing file is inefficient because a large number of copies and high network delay. In this paper, a parallel writing mechanism based on core copy set (PWMBCS) is proposed to solve those problems. Paralleling writing is given out to deal with network delay. The control algorithm for write order and parallel degree also is given out in this paper. As shown in many tests, the core copy set can form with writing, and PWMBCS is six times more than normal writing mechanism.

  9. OPTIMIZING THE USE OF AN SPI FLASH PROM IN MICROBLAZE-BASED EMBEDDED SYSTEMS

    Directory of Open Access Journals (Sweden)

    Ahmed Hanafi

    2013-11-01

    Full Text Available This paper aims to simplify FPGA designs that incorporate Embedded Software Systems using a soft core Processor. It describes a simple solution to reduce the need of multiple non-volatile memory devices by using one SPI (Serial Peripheral Interface Flash PROM for FPGA configuration data, software code (Processor applications, and miscellaneous user data. We have thus developed a design based on a MicroBlaze soft processor implemented on a Xilinx Spartan-6 FPGA SP605 Evaluation Kit. The hardware architecture with SPI flash was designed using the Xilinx Platform Studio (XPS and the software applications, including the bootloader, was developed with Xilinx Software Development Kit (SDK. ISE Design Tools prepared by Xilinx Company, is employed to create the files used to program flash memory which are SREC (S-record file associated with software code, Hexadecimal file for user data, and bootloader file to configure the FPGA and allows software applications stored in flash memory to be executed when the system is powered on. Reading access to the SPI Flash memory is simplified by the use of Xilinx In-System Flash (ISF library.

  10. Study on administrative system for official e-files-box business%e-files-box 办公管理系统

    Institute of Scientific and Technical Information of China (English)

    李敏

    2005-01-01

    介绍了办公管理系统在实际应用中的可行性领域.通过对数据库的管理,实现了e-files-box办公管理系统的开发,着重阐述了系统的主要功能,性能及实现.系统具有友好、简洁、美观的用户界面,良好的安全性,使用户的操作得以充分保障,而且满足数据的一致性和唯一性.

  11. Comparative evaluation of sealing properties of different obturation systems placed over apically fractured rotary NiTi files

    Directory of Open Access Journals (Sweden)

    Sonali Taneja

    2012-01-01

    Full Text Available Aim: To evaluate sealing properties of different obturation systems placed over apically fractured rotary NiTi files. Materials and Methods: Forty freshly extracted human mandibular premolars were prepared by using Protaper (Dentsply-Maillefer, Ballaigues, Switzerland or the RaCe (FKG Dentaire, La Chaux-de-Fonds, Switzerland systems (n=20 for each, after which half of the specimens were subjected to instrument separation at the apical level. Roots with and without apically separated instruments (n=5 were filled with the two obturation systems i.e. Thermafil and lateral compaction technique. The modified glucose penetration setup was used to assess the microleakage. The leakage data was statistically analyzed. Results: The amount of leakage was significantly lower in specimens containing fractured instruments, regardless of the obturation method used. Roots obturated with Thermafil displayed significantly less leakage than cold lateral compaction technique, both, in the presence and absence of separated instruments. There was no significant difference among specimens prepared with ProTaper and RaCe when Thermafil obturation was done. But with cold lateral compaction technique, RaCe system showed less leakage as compared to ProTaper system. Conclusion: The type of obturation may play more important role than the type of instrument or retained/non-retained instrument factor.

  12. ACONC Files

    Data.gov (United States)

    U.S. Environmental Protection Agency — ACONC files containing simulated ozone and PM2.5 fields that were used to create the model difference plots shown in the journal article. This dataset is associated...

  13. 831 Files

    Data.gov (United States)

    Social Security Administration — SSA-831 file is a collection of initial and reconsideration adjudicative level DDS disability determinations. (A few hearing level cases are also present, but the...

  14. 基于LAN的File-agent技术的设计--利用File-agent技术实现LAN内大容量数据块的重用%LAN-Based File-agent Design

    Institute of Scientific and Technical Information of China (English)

    王六平; 刘宏

    2003-01-01

    尽管接入Intemet的速度越来越快,但仍不能满足集群用户同时使用同一多媒体信息服务的需求.为了解决这类问题,该文提出了一种基于LAN的File-agent技术,利用该技术可以实现LAN内大容量数据块的重用.

  15. File Hide Method Based on Drive Stack Unit%基于驱动堆栈单元的文件隐藏方法

    Institute of Scientific and Technical Information of China (English)

    何耀彬; 李祥和; 孙岩

    2011-01-01

    为能在操作系统的驱动级实现新的文件隐藏点,对传统的文件系统过滤驱动原理和驱动数据堆栈单元结构进行分析.通过修改驱动堆栈单元的结构和完成例程,配合修改I/O请求包的传递方法,实现2种驱动级文件隐藏的方法.使用该2种方法的文件可以在系统中实现深度隐藏,使得操作系统无法查询,也不能通过正常途径访问.%In order to get new file hidden points in drive-level of system, the principle of File System Filter Driver(FSFD) and the structure of driver stack location are analyzed. Through making some changes in driver stack location's structure and CompletionRoutine, besides modifying the I/O Requst Packet(IRP) delivery method, two methods to hide files are implemented. Hidden files using these methods achieve depth hide. They can not be queried by system or be accessed through normal channels.

  16. Photoelectrochemical based direct conversion systems

    Energy Technology Data Exchange (ETDEWEB)

    Kocha, S.; Arent, D.; Peterson, M. [National Renewable Energy Lab., Golden, CO (United States)] [and others

    1995-09-01

    The goal of this research is to develop a stable, cost effective, photoelectrochemical based system that will split water upon illumination, producing hydrogen and oxygen directly, using sunlight as the only energy input. This type of direct conversion system combines a photovoltaic material and an electrolyzer into a single monolithic device. We report on our studies of two multifunction multiphoton photoelectrochemical devices, one based on the ternary semiconductor gallium indium phosphide, (GaInP{sub 2}), and the other one based on amorphous silicon carbide. We also report on our studies of the solid state surface treatment of GaInP{sub 2} as well as our continuing effort to develop synthetic techniques for the attachment of transition metal complexes to the surface of semiconductor electrodes. All our surface studies are directed at controlling the interface energetics and forming stable catalytic surfaces.

  17. A Rewritable, Random-Access DNA-Based Storage System

    Science.gov (United States)

    Tabatabaei Yazdi, S. M. Hossein; Yuan, Yongbo; Ma, Jian; Zhao, Huimin; Milenkovic, Olgica

    2015-09-01

    We describe the first DNA-based storage architecture that enables random access to data blocks and rewriting of information stored at arbitrary locations within the blocks. The newly developed architecture overcomes drawbacks of existing read-only methods that require decoding the whole file in order to read one data fragment. Our system is based on new constrained coding techniques and accompanying DNA editing methods that ensure data reliability, specificity and sensitivity of access, and at the same time provide exceptionally high data storage capacity. As a proof of concept, we encoded parts of the Wikipedia pages of six universities in the USA, and selected and edited parts of the text written in DNA corresponding to three of these schools. The results suggest that DNA is a versatile media suitable for both ultrahigh density archival and rewritable storage applications.

  18. 49 CFR 236.913 - Filing and approval of PSPs.

    Science.gov (United States)

    2010-10-01

    ... for Processor-Based Signal and Train Control Systems § 236.913 Filing and approval of PSPs. (a) Under... architectural concepts; the PSP describes a product that uses design or safety assurance concepts considered... the end of the system design review phase of product development and 180 days prior to...

  19. A Systems Modeling Approach for Risk Management of Command File Errors

    Science.gov (United States)

    Meshkat, Leila

    2012-01-01

    The main cause of commanding errors is often (but not always) due to procedures. Either lack of maturity in the processes, incompleteness of requirements or lack of compliance to these procedures. Other causes of commanding errors include lack of understanding of system states, inadequate communication, and making hasty changes in standard procedures in response to an unexpected event. In general, it's important to look at the big picture prior to making corrective actions. In the case of errors traced back to procedures, considering the reliability of the process as a metric during its' design may help to reduce risk. This metric is obtained by using data from Nuclear Industry regarding human reliability. A structured method for the collection of anomaly data will help the operator think systematically about the anomaly and facilitate risk management. Formal models can be used for risk based design and risk management. A generic set of models can be customized for a broad range of missions.

  20. Effectiveness of various irrigation activation protocols and the self-adjusting file system on smear layer and debris removal.

    Science.gov (United States)

    Çapar, İsmail Davut; Aydinbelge, Hale Ari

    2014-01-01

    The purpose of the present study is to evaluate smear layer generation and residual debris after using self-adjusting file (SAF) or rotary instrumentation and to compare the debris and smear layer removal efficacy of the SAF cleaning/shaping irrigation system against final agitation techniques. One hundred and eight maxillary lateral incisor teeth were randomly divided into nine experimental groups (n = 12), and root canals were prepared using ProTaper Universal rotary files, with the exception of the SAF instrumentation group. During instrumentation, root canals were irrigated with a total of 16 mL of 5% NaOCl. For final irrigation, rotary-instrumented groups were irrigated with 10 mL of 17% EDTA and 10 mL of 5% NaOCl using different irrigation agitation regimens (syringe irrigation with needles, NaviTip FX, manual dynamic irrigation, CanalBrush, EndoActivator, EndoVac, passive ultrasonic irrigation (PUI), and SAF irrigation). In the SAF instrumentation group, root canals were instrumented for 4 min at a rate of 4 mL/min with 5% NaOCl and received a final flush with same as syringe irrigation with needles. The surface of the root dentin was observed using a scanning electron microscope. The SAF instrumentation group generated less smear layer and yielded cleaner canals compared to rotary instrumentation. The EndoActivator, EndoVac, PUI, and SAF irrigation groups increased the efficacy of irrigating solutions on the smear layer and debris removal. The SAF instrumentation yielded cleaner canal walls when compared to rotary instrumentation. None of the techniques completely removed the smear layer from the root canal walls.

  1. 一种有效保护数据的文件系统%A file system for data effective protection

    Institute of Scientific and Technical Information of China (English)

    张游杰

    2012-01-01

    A new file system PSFS (pseudo sequence file system) is presented, which can effectively protect the data removed by mistake. The proposed file system takes a pseudo circular queue as the core to makes full use of the increasing capacity of hard disk, flash disk and other storage device. The deleted files are guaranteed not to be covered when the storage medium have enough space. The structure of the file system is described in detail. A example is used to illustrate its principle and data recovery method. Comparing with the existing data recovery technologies, the proposed method can recover the data more quickly and accurately.%提出了一种可有效保护被误删除数据的新的文件系统PSFS,以一个伪循环队列为核心,充分利用了磁盘和U盘等存储设备越来越大的容量,保证在存储介质有空余空间时不覆盖被删除的文件.在此重点描述了所提文件系统的结构,通过举例分析了其工作原理及恢复数据的方法.该方法表明所提文件系统的数据恢复速度比现有其他数据恢复技术要快,且数据恢复的准确率也大大提高.

  2. Supplement B: Research Networking Systems Characteristics Profiles. A Companion to the OCLC Research Report, Registering Researchers in Authority Files

    Science.gov (United States)

    Smith-Yoshimura, Karen; Altman, Micah; Conlon, Michael; Cristán, Ana Lupe; Dawson, Laura; Dunham, Joanne; Hickey, Thom; Hill, Amanda; Hook, Daniel; Horstmann, Wolfram; MacEwan, Andrew; Schreur, Philip; Smart, Laura; Wacker, Melanie; Woutersen, Saskia

    2014-01-01

    The OCLC Research Report, "Registering Researchers in Authority Files", [Accessible in ERIC as ED564924] summarizes the results of the research conducted by the OCLC Research Registering Researchers in Authority Files Task Group in 2012-2014. Details of this research are in supplementary data sets: (1) "Supplement A: Use Cases. A…

  3. Identifiable Data Files - Denominator File

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Denominator File combines Medicare beneficiary entitlement status information from administrative enrollment records with third-party payer information and GHP...

  4. Double Hiding Information in Color Image File Based on Classical LSB Method

    Directory of Open Access Journals (Sweden)

    Aymen Mudheher Badr

    2014-07-01

    Full Text Available This study presents a two principles, Cryptography and Steganography, each tow methods work separately from the other to ensure a secure content. We are developed an algorithm to increase the safety and reliability of the copyrights of the images or books (etc. that published on the internet by providing a watermark image (as logo hiding inside the original file that we want product it. Firstly reading image (the logo image, convert it to binary and encrypted it by using EX-OR with a secret key and embedding it inside a gray image in the LSB (in the 1st and hiding first key in the 2nd bit and the second key in the 3rd bit, then we embedding them in the LSB of Original image in RGB to be protected. The two secret keys, first one as an encryption key and the second key using as signature (data that have been taken from the cover image (original to make sure the reliability of the image transmitted via the Internet.

  5. Variable length gram based file type identification algorithm%基于变长元组的文件类型识别算法

    Institute of Scientific and Technical Information of China (English)

    曹鼎; 罗军勇; 尹美娟

    2011-01-01

    快速准确地判断文件实体的真实类型对保护计算机信息安全具有重要意义.通过分析现有基于二进制内容的文件类型识别算法中存在的问题,提出采用变长元组描述文件的统计特征,并结合结构化文件中元组的分散度、稳定度以及条件广泛度设计出一种特征评估函数,从而更加准确地选取有效的特征.该算法不依靠特定文件类型的结构和关键标识,适用范围更为广泛.实验表明该算法能有效提高文件类型识别的查准率和查全率.%Fast and accurate identification of the true type of an arbitrary file is very important in information security.Concerning the problems of current content-based file type identification algorithms, variable-length gram was introduced for describing statistic characteristics of files' binary content, and a new evaluation function combining gram divergence, stability and conditional width was adopted for feature selection for structured file types. This algorithm does not rely on the structure and key words of any specific file types, which allows the approach to be applied more widely. The experimental results show that the proposed approach improves the precision and recall of file type identification.

  6. A Method for Reconstructing the FAT File System from Flash Memory%一种基于闪存物理镜像的FAT文件系统重组方法

    Institute of Scientific and Technical Information of China (English)

    张丽; 谭毓安; 郑军; 马忠梅; 王文明; 李元章

    2013-01-01

    The file system reconstruction is an effective way of recovering the forensic data from Flash memory .However , the traditional reconstruction methods need a precondition that is there are both the logical image and the physical image of flash memory at the same time and that is usually not satisfied in practice .In this paper ,we propose a method for reconstructing the File Allocation Table (FAT ) file system of Flash device when only a physical image of Flash memory is acquired .After introducing the statistical methods to identify the logical address bytes and the page state byte from the physical image ,we propose the new algo-rithm to reconstruct the newest FAT file system which is based on the newest value of the page state .At last ,take the special flash devices with MTK6229 controllers as examples ,we expound the methods related to reconstructing the FAT file system and verify the reconstruction algorithm .%文件系统重组是闪存设备取证研究进行数据恢复的主要手段。传统的文件系统重组方法需要同时获取闪存设备在同一时刻的逻辑镜像和物理镜像,该条件在取证实践中常常难以满足,故提出一种仅依赖闪存物理镜像重组文件分配表(FAT)文件系统的方法。在引入统计分析法从物理镜像中提取逻辑地址字段和页状态字段的基础上,给出利用最新页状态值准确重组闪存设备最新FAT文件系统镜像的算法。最后以MTK6229闪存设备物理镜像的FAT文件系统重组过程为例,验证上述重组算法及相关方法是正确的。

  7. Fingerprint Indoor Position System Based

    Directory of Open Access Journals (Sweden)

    José Antonio Gómez Martin

    2013-01-01

    Full Text Available This paper presents a research and a development of a fingerprint-indoor-positioning system using the Received Signal Strength Indication (RSSI of a Wireless Sensor Network (WSN. The WSN implementation is based on two different protocol stacks: BitCloud and OpenMAC, a certified ZigBee Compliant Platform (ZCP and an IEEE 802.15.4 embedded software implementation respectively, both from Atmel, and the system uses two different fingerprint algorithms, Simple and Centroid. A comparative analysis of both algorithms using both protocol stacks implementations have been performed to ascertain the best WSN protocol stack and the best algorithm for positioning purposes.

  8. Fail-over file transfer process

    Science.gov (United States)

    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.

  9. NVST Data Archiving System Based On FastBit NoSQL Database

    Science.gov (United States)

    Liu, Ying-bo; Wang, Feng; Ji, Kai-fan; Deng, Hui; Dai, Wei; Liang, Bo

    2014-06-01

    The New Vacuum Solar Telescope (NVST) is a 1-meter vacuum solar telescope that aims to observe the fine structures of active regions on the Sun. The main tasks of the NVST are high resolution imaging and spectral observations, including the measurements of the solar magnetic field. The NVST has been collecting more than 20 million FITS files since it began routine observations in 2012 and produces a maximum observational records of 120 thousand files in a day. Given the large amount of files, the effective archiving and retrieval of files becomes a critical and urgent problem. In this study, we implement a new data archiving system for the NVST based on the Fastbit Not Only Structured Query Language (NoSQL) database. Comparing to the relational database (i.e., MySQL; My Structured Query Language), the Fastbit database manifests distinctive advantages on indexing and querying performance. In a large scale database of 40 million records, the multi-field combined query response time of Fastbit database is about 15 times faster and fully meets the requirements of the NVST. Our study brings a new idea for massive astronomical data archiving and would contribute to the design of data management systems for other astronomical telescopes.

  10. Arduino-based automation of a DNA extraction system.

    Science.gov (United States)

    Kim, Kyung-Won; Lee, Mi-So; Ryu, Mun-Ho; Kim, Jong-Won

    2015-01-01

    There have been many studies to detect infectious diseases with the molecular genetic method. This study presents an automation process for a DNA extraction system based on microfluidics and magnetic bead, which is part of a portable molecular genetic test system. This DNA extraction system consists of a cartridge with chambers, syringes, four linear stepper actuators, and a rotary stepper actuator. The actuators provide a sequence of steps in the DNA extraction process, such as transporting, mixing, and washing for the gene specimen, magnetic bead, and reagent solutions. The proposed automation system consists of a PC-based host application and an Arduino-based controller. The host application compiles a G code sequence file and interfaces with the controller to execute the compiled sequence. The controller executes stepper motor axis motion, time delay, and input-output manipulation. It drives the stepper motor with an open library, which provides a smooth linear acceleration profile. The controller also provides a homing sequence to establish the motor's reference position, and hard limit checking to prevent any over-travelling. The proposed system was implemented and its functionality was investigated, especially regarding positioning accuracy and velocity profile.

  11. Nucleic acid based logical systems.

    Science.gov (United States)

    Han, Da; Kang, Huaizhi; Zhang, Tao; Wu, Cuichen; Zhou, Cuisong; You, Mingxu; Chen, Zhuo; Zhang, Xiaobing; Tan, Weihong

    2014-05-12

    Researchers increasingly visualize a significant role for artificial biochemical logical systems in biological engineering, much like digital logic circuits in electrical engineering. Those logical systems could be utilized as a type of servomechanism to control nanodevices in vitro, monitor chemical reactions in situ, or regulate gene expression in vivo. Nucleic acids (NA), as carriers of genetic information with well-regulated and predictable structures, are promising materials for the design and engineering of biochemical circuits. A number of logical devices based on nucleic acids (NA) have been designed to handle various processes for technological or biotechnological purposes. This article focuses on the most recent and important developments in NA-based logical devices and their evolution from in vitro, through cellular, even towards in vivo biological applications.

  12. 77 FR 15026 - Privacy Act of 1974; Farm Records File (Automated) System of Records

    Science.gov (United States)

    2012-03-14

    ... entity data; Combined producer data; production and marketing data; Lease and transfer of allotments and... System, Automated Price Support System, Average Crop Revenue Elections, ] Asparagus Revenue Market Loss...

  13. Lapin Data Interchange Among Database, Analysis and Display Programs Using XML-Based Text Files

    Science.gov (United States)

    2005-01-01

    The purpose of grant NCC3-966 was to investigate and evaluate the interchange of application-specific data among multiple programs each carrying out part of the analysis and design task. This has been carried out previously by creating a custom program to read data produced by one application and then write that data to a file whose format is specific to the second application that needs all or part of that data. In this investigation, data of interest is described using the XML markup language that allows the data to be stored in a text-string. Software to transform output data of a task into an XML-string and software to read an XML string and extract all or a portion of the data needed for another application is used to link two independent applications together as part of an overall design effort. This approach was initially used with a standard analysis program, Lapin, along with standard applications a standard spreadsheet program, a relational database program, and a conventional dialog and display program to demonstrate the successful sharing of data among independent programs. Most of the effort beyond that demonstration has been concentrated on the inclusion of more complex display programs. Specifically, a custom-written windowing program organized around dialogs to control the interactions have been combined with an independent CAD program (Open Cascade) that supports sophisticated display of CAD elements such as lines, spline curves, and surfaces and turbine-blade data produced by an independent blade design program (UD0300).

  14. Composition and Realization of Source-to-Sink High-Performance Flows: File Systems, Storage, Hosts, LAN and WAN

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Chase Qishi [Univ. of Tennessee, Memphis, TN (United States)

    2016-12-01

    A number of Department of Energy (DOE) science applications, involving exascale computing systems and large experimental facilities, are expected to generate large volumes of data, in the range of petabytes to exabytes, which will be transported over wide-area networks for the purpose of storage, visualization, and analysis. To support such capabilities, significant progress has been made in various components including the deployment of 100 Gbps networks with future 1 Tbps bandwidth, increases in end-host capabilities with multiple cores and buses, capacity improvements in large disk arrays, and deployment of parallel file systems such as Lustre and GPFS. High-performance source-to-sink data flows must be composed of these component systems, which requires significant optimizations of the storage-to-host data and execution paths to match the edge and long-haul network connections. In particular, end systems are currently supported by 10-40 Gbps Network Interface Cards (NIC) and 8-32 Gbps storage Host Channel Adapters (HCAs), which carry the individual flows that collectively must reach network speeds of 100 Gbps and higher. Indeed, such data flows must be synthesized using multicore, multibus hosts connected to high-performance storage systems on one side and to the network on the other side. Current experimental results show that the constituent flows must be optimally composed and preserved from storage systems, across the hosts and the networks with minimal interference. Furthermore, such a capability must be made available transparently to the science users without placing undue demands on them to account for the details of underlying systems and networks. And, this task is expected to become even more complex in the future due to the increasing sophistication of hosts, storage systems, and networks that constitute the high-performance flows. The objectives of this proposal are to (1) develop and test the component technologies and their synthesis methods to

  15. NeuronDepot: keeping your colleagues in sync by combining modern cloud storage services, the local file system, and simple web applications.

    Science.gov (United States)

    Rautenberg, Philipp L; Kumaraswamy, Ajayrama; Tejero-Cantero, Alvaro; Doblander, Christoph; Norouzian, Mohammad R; Kai, Kazuki; Jacobsen, Hans-Arno; Ai, Hiroyuki; Wachtler, Thomas; Ikeno, Hidetoshi

    2014-01-01

    Neuroscience today deals with a "data deluge" derived from the availability of high-throughput sensors of brain structure and brain activity, and increased computational resources for detailed simulations with complex output. We report here (1) a novel approach to data sharing between collaborating scientists that brings together file system tools and cloud technologies, (2) a service implementing this approach, called NeuronDepot, and (3) an example application of the service to a complex use case in the neurosciences. The main drivers for our approach are to facilitate collaborations with a transparent, automated data flow that shields scientists from having to learn new tools or data structuring paradigms. Using NeuronDepot is simple: one-time data assignment from the originator and cloud based syncing-thus making experimental and modeling data available across the collaboration with minimum overhead. Since data sharing is cloud based, our approach opens up the possibility of using new software developments and hardware scalabitliy which are associated with elastic cloud computing. We provide an implementation that relies on existing synchronization services and is usable from all devices via a reactive web interface. We are motivating our solution by solving the practical problems of the GinJang project, a collaboration of three universities across eight time zones with a complex workflow encompassing data from electrophysiological recordings, imaging, morphological reconstructions, and simulations.

  16. NeuronDepot: Keeping your colleagues in sync by combining modern cloud storage services, the local file system, and simple web applications

    Directory of Open Access Journals (Sweden)

    Philipp L Rautenberg

    2014-06-01

    Full Text Available Neuroscience today deals with a data deluge derived from the availability of high-throughput sensors of brain structure and brain activity, and increased computational resources for detailed simulations with complex output. We report here (1 a novel approach to data sharing between collaborating scientists that brings together file system tools and cloud technologies, (2 a service implementing this approach, called NeuronDepot, and (3 an example application of the service to a complex use case in the neurosciences. The main drivers for our approach are to facilitate collaborations with a transparent, automated data flow that shields scientists from having to learn new tools or data structuring paradigms. Using NeuronDepot is simple: one-time data assignment from the originator and cloud based syncing – thus making experimental and modeling data available across the collaboration with minimum overhead. Since data sharing is cloud based, our approach opens up the possibility of using new software developments and hardware scalabitliy which are associated with elastic cloud computing. We provide an implementation that relies on existing synchronization services and is usable from all devices via a reactive web interface. We are motivating our solution by solving the practical problems of the GinJang project, a collaboration of three universities across eight time zones with a complex workflow encompassing data from electrophysiological recordings, imaging, morphological reconstructions, and simulations.

  17. Download this PDF file

    African Journals Online (AJOL)

    Fr. Ikenga

    Nigeria; and the gains and challenges of utilizing e-taxation in tax ... teething problems usually encountered in all new schemes. ... is to help tax authorities reduce and possibly eliminate tax evasion. .... issues that include how to use the tax authorities' electronic tax filing system and ..... financial institution for Direct Deposit.

  18. A DRM Scheme Using File Physical Information

    Directory of Open Access Journals (Sweden)

    Cheng Qu

    2015-05-01

    Full Text Available A digital file has both the content and physical information, however the latter was not fully made use of in previous digital rights management (DRM systems. This paper introduces the idea of making use of file physical information to improve the system security and provides a scheme based on this idea to resist the replay attack in DRM systems. In our scheme, compared to commonly used schemes, we remove the dependency on continuous online connection from the client-side to the server-side or the usage of tamper-proof hardware, such as Trusted Platform Module (TPM. The scheme is appropriate for offline digital content usage. Primary experiments demonstrate that our scheme is secure enough to be put into practice use.

  19. Experience, use, and performance measurement of the Hadoop File System in a typical nuclear physics analysis workflow

    Science.gov (United States)

    Sangaline, E.; Lauret, J.

    2014-06-01

    The quantity of information produced in Nuclear and Particle Physics (NPP) experiments necessitates the transmission and storage of data across diverse collections of computing resources. Robust solutions such as XRootD have been used in NPP, but as the usage of cloud resources grows, the difficulties in the dynamic configuration of these systems become a concern. Hadoop File System (HDFS) exists as a possible cloud storage solution with a proven track record in dynamic environments. Though currently not extensively used in NPP, HDFS is an attractive solution offering both elastic storage and rapid deployment. We will present the performance of HDFS in both canonical I/O tests and for a typical data analysis pattern within the RHIC/STAR experimental framework. These tests explore the scaling with different levels of redundancy and numbers of clients. Additionally, the performance of FUSE and NFS interfaces to HDFS were evaluated as a way to allow existing software to function without modification. Unfortunately, the complicated data structures in NPP are non-trivial to integrate with Hadoop and so many of the benefits of the MapReduce paradigm could not be directly realized. Despite this, our results indicate that using HDFS as a distributed filesystem offers reasonable performance and scalability and that it excels in its ease of configuration and deployment in a cloud environment.

  20. Evaluation of the Efficacy of TRUShape and Reciproc File Systems in the Removal of Root Filling Material: An Ex Vivo Micro-Computed Tomographic Study.

    Science.gov (United States)

    de Siqueira Zuolo, Arthur; Zuolo, Mario Luis; da Silveira Bueno, Carlos Eduardo; Chu, Rene; Cunha, Rodrigo Sanches

    2016-02-01

    The purpose of this study was to evaluate the efficacy of TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) compared with the Reciproc file (VDW, Munich, Germany) in the removal of filling material from oval canals filled with 2 different sealers and differences in the working time. Sixty-four mandibular canines with oval canals were prepared and divided into 4 groups (n = 16). Half of the specimens were filled with gutta-percha and pulp canal sealer (PCS), and the remainders were filled with gutta-percha and bioceramic sealer (BCS). The specimens were retreated using either the Reciproc or TRUShape files. A micro-computed tomographic scanner was used to assess filling material removal, and the time taken for removal was also recorded. Data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests. The mean volume of the remaining filling material was similar when comparing both files (P ≥ .05). However, in the groups filled with BCS, the percentage of remaining filling material was higher than in the groups filled with PCS (P material when comparing both files system; however, Reciproc was faster than TRUShape. BCS groups exhibited significantly more remaining filling material in the canals and required more time for retreatment. Remaining filling material was observed in all samples regardless of the technique or sealer used. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.