Draft grid storage namespace guidelines

The Grid can provide MICE not only with computing (number-crunching) power, but also with a secure global framework allowing users access to data. Although the focus is usually on the mass of experiment data, the Grid also opens up new possibilities for the storage and sharing of other material within the collaboration. This document provides an introduction to data storage on the Grid and describes the proposal for the directory structures to be used by MICE when registering data files stored on the Grid within a File Catalogue such as LFC

RFC: Data flow from the MICE experiment

This article can be accessed at the link below.This document sketches out the flow of data from the MICE experiment, as I currently understand it. This includes not only illustrating the structure of the data flow, but also setting out a consistent vocabulary with which to describe it. Many aspects of this data flow are either misunderstood by me, currently undecided, not yet implemented, or simply have never been considered before; so feedback is both welcomed and essential. Background information about job submission and file storage on the Grid can be found in previous MICE Notes and the references therein. In particular the first two sections of Note 247 are meant to provide a gentle introduction to Grid data storage from the MICE perspective, and timid MICE may wish to read those first

The online buffer

Copyright @ 2009 MICEThis is a discussion document regarding the proposed use of the Online Buffer. The Online Buffer is used to store locally the RAW data files created by the Event Builder, before they are uploaded to Castor by the data mover. The files may also be used by the online monitoring and reconstruction activities. At the Trigger-DAQ-Controls Review, the reviewers warned that this three-way activity might saturate the disks, and also that the file uploads to the Grid could conflict with the writing of DAQ data. It was proposed to ameliorate this by splitting the buffer into a set of independent volumes into which the DAQ data would be written on a round-robin basis; outgoing files would meanwhile be read only from one of the other volumes. Further, files being uploaded to the Grid would be staged on the transfer box’ system disk, as the (local) staging process is expected to be more deterministic and easier to control than transfers across the WAN

Blogging the 2006 FIFA World Cup Finals

This study focuses on the use of new technologies by the sports-media complex, looking specifically at the 2006 FIFA World Cup Finals. Combining the world's single largest sports media event with one of the most current, complex forms of Web-based communication, this article explores extent to which football fans embedded in Germany used the Internet to blog their World Cup experiences. Various categories of blog sites were identified, including independent bloggers, bloggers using football-themed Web sites, and blogs hosted on corporate-sponsored platforms. The study shows that the anticipated "democratizing potential" of blogging was not evident during Germany 2006. Instead, blogging acted as a platform for corporations, which, employing professional journalists, told the fans' World Cup stories. © 2009 Human Kinetics, inc

Pencil-Beam Surveys for Trans-Neptunian Objects: Novel Methods for Optimization and Characterization

Digital co-addition of astronomical images is a common technique for increasing signal-to-noise and image depth. A modification of this simple technique has been applied to the detection of minor bodies in the Solar System: first stationary objects are removed through the subtraction of a high-SN template image, then the sky motion of the Solar System bodies of interest is predicted and compensated for by shifting pixels in software prior to the co-addition step. This "shift-and-stack" approach has been applied with great success in directed surveys for minor Solar System bodies. In these surveys, the shifts have been parameterized in a variety of ways. However, these parameterizations have not been optimized and in most cases cannot be effectively applied to data sets with long observation arcs due to objects' real trajectories diverging from linear tracks on the sky. This paper presents two novel probabilistic approaches for determining a near-optimum set of shift-vectors to apply to any image set given a desired region of orbital space to search. The first method is designed for short observational arcs, and the second for observational arcs long enough to require non-linear shift-vectors. Using these techniques and other optimizations, we derive optimized grids for previous surveys that have used "shift-and-stack" approaches to illustrate the improvements that can be made with our method, and at the same time derive new limits on the range of orbital parameters these surveys searched. We conclude with a simulation of a future applications for this approach with LSST, and show that combining multiple nights of data from such next-generation facilities is within the realm of computational feasibility.Comment: Accepted for publication in PASP March 1, 2010

Efficient detection of periodic orbits in high dimensional systems

This paper is concerned with developing a method for detecting unstable periodic orbits (UPOs) by stabilising transformations. Here the strategy is to transform the system of interest in such away that the orbits become stable. However, the number of such transformations becomes overwhelming as we move to higher dimensions [5, 16, 17]. We have recently proposed a set of stabilising transformations which is constructed from a small set of already found UPOs [1]. The real value of the set is that its cardinality depends on the dimension of the unstable manifold at the UPO rather than the dimension of the system. Here we extend this approach to high dimensional systems of ODEs and apply it to the model example of a chaotic spatially extended system - the Kuramoto-Sivashinsky equation

Serum contents of immunoreactive pancreatic secretory trypsin inhibitor and seminal plasma acrosin-trypsin inhibitor in polytraumatized patients

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