468 research outputs found
Static and Dynamic Data Models for the Storage Resource Manager v2.2
No full textWe present a conceptual model for the Storage Resource Manager, the standard interface adopted for the storage systems of the Worldwide LHC Computing Grid. This model provides a clear and concise definition of the structural and behavioral concepts underlying the interface specification and is meant to support service and application development. Different languages (natural language, UML diagrams, and simple set-theoretic and logical notation) are used to describe different aspects of the model
A Model for the Storage Resource Manager
No full textThe Storage Resource Manager has been proposed as a standard interface for high-end storage systems deployed on Grid architectures. In this paper we propose a conceptual model for the SRM that should supplement its API specification with a clear and concise definition of its underlying structural and behavioral concepts. This model would make it easier to define its semantics, it would help service and application developers, and provide for a more rigorous validation of implementations. Different notations are used as appropriate to define different aspects of the model
Experiences in testing a Grid service in a production environment
No full textThis paper reports on the problems and solutions related to the testing of
several implementations for conformance to a standard storage management interface adopted in the Worldwide LHC Computing Grid
Bibliographie : Octavia römische Geschichte. Zugabe des ersten Theils, [vol. 2] (Nürnberg: J. Hoffmann, 1678)
No full textZweiter Band der ersten Fassung der "Römischen Octavia". Cf. zur vollständigen Publikationsgeschichte: Octavia römische Geschichte, [vol. 1] (Nürnberg: J. Hoffmann, 1677). Enthält mehrere teils wahrscheinlich, teils sicher autorfremde Gedichte. Zwei davon stammen von Christian Hofmann von Hofmannswaldau (vgl. HKA I, pp. CLXXIVf., Anm. 195). Von der "Geschichte der Flavia Domitilla und der Cönis", pp. 920-1015, existiert eine Übersetzung einer unbekannten französischen Hofdame ins Französische, datiert auf den 9. März 1714 (23: Cod.Guelf. 196.1 Extravag.)
Relaxed Data Consistency with CONStanza
No full textData replication is an important aspect in a Data Grid for increasing fault tolerance and availability. Many Grid replication tools or middleware systems deal with read-only files which implies that replicated data items are always consistent. However, there are several applications that do
require updates to existing data and the respective replicas. In this article we present a replica consistency service that allows for replica updates in a single-master scenario with lazy update synchronisation. The system allows for updates of (heterogeneous) relational databases, and it is designed to support flat files as well. It keeps remote replicas synchronised and partially (“lazily”) consistent. We report on
the design and implementation of a novel “relaxed” replica consistency service and show its usefulness in a typical application use case
A performance study on the synchronisation of heterogeneous Grid databases using CONStanza
No full textIn Grid environments, several heterogeneous database management systems are used in various administrative domains. However, data exchange and synchronisation need to be available across different sites and different database systems. In this article we present our data consistency service CONStanza and give details on how we achieve relaxed update synchronisation between different database implementations. The integration in existing Grid environments is one of the major goals of the system. Performance tests have been executed following a factorial approach. Detailed experimental results and a statistical analysis are presented to evaluate the system components and drive future developments. (C) 2010 Elsevier B.V. All rights reserved
The Simultaneous Assessment of Time and Motion Response during Dual Tasks
No full textMeasurement of reaction time in clinical settings is generally employed to assess cognitive abilities by having a subject perform standard simple tests. In this study, a new method of measuring response time (RT) was developed using a system composed of LEDs that emit light stimuli and are equipped with proximity sensors. The RT is measured as the time taken by the subject to turn off the LED target by moving the hand towards the sensor. Through an optoelectronic passive marker system, the associated motion response is assessed. Two tasks of 10 stimuli each were defined: simple reaction time and recognition reaction time tasks. To validate the method implemented to measure RTs, the reproducibility and repeatability of the measurements were estimated, and, to test the method’s applicability, a pilot study was conducted on 10 healthy subjects (6 females and 4 males, age = 25 ± 2 years), reporting, as expected, that the response time was affected by the task’s difficulty. Unlike commonly used tests, the developed method has proven to be adequate for the simultaneous evaluation of the response in terms of time and motion. Furthermore, thanks to the playful nature of the tests, this method could also be used for clinical and pediatric applications to measure the impact of motor and cognitive impairments on RT
Stories from the Lapidarium: legio IIII Flavia Felix in Dalmatia
No full textAutor raspravlja o ulomku monumentalne nadgrobne stele neraščlanjenog trupa koja se čuva u lapidariju Arheološkog muzeja Zadar. Stela se ne odlikuje nikakvim posebnostima, a čak joj ni natpis nije potpuno očuvan, no jedan detalj s natpisa otkriva zanimljivu činjenicu koja stvara čvrste temelje za zaključak da je legio IIII Flavia Felix zapravo rekonstituirana legio IIII Macedonica, koja nakon osnivanja zauzima ispražnjeni garnizon na rijeci Krki. Nadalje se raspravlja o dosadašnjim spoznajama o osnutku legije IIII Flavia Felix te njezinu boravku u Dalmaciji, s pregledom do sada poznatih natpisa njezinih pripadnika s dalmatinskog tla.The author discusses the fragment of a single-section funerary stele kept in the Lapidarium of the Archaeological Museum Zadar. Although it does not contain any special features – even its inscription is not fully preserved – a detail of the inscription reveals an interesting fact that can be seen as solid evidence that legio IIII Flavia Felix was actually a reconstituted legio IIII Macedonica that had occupied the vacated encampment on the River Krka. The known facts about the founding of IIII Flavia Felix Legion and its deployment in Dalmatia are also discussed. An overview of the inscriptions containing the legion’s members from Dalmatian soil is also provided
- …
