Bauer, Anne, Baltay, Charles, Coppi, Paolo, Donalek, Ciro, Drake, Andrew, Djorgovski, S. G., ...
We identify 3113 highly variable objects in 7200 deg^2 of the Palomar-QUEST (PQ) Survey, which each varied by more than 0.4 mag simultaneously in two broadband optical filters on timescales from...
Bauer, Anne, Baltay, Charles, Coppi, Paolo, Donalek, Ciro, Drake, Andrew, Djorgovski, S. G., ...
We identify 3,113 highly variable objects in 7,200 square degrees of the Palomar-QUEST Survey, which each varied by more than 0.4 magnitudes simultaneously in two broadband optical filters on...
Grist: Grid-based Data Mining for Astronomy (2008)
P. L. Shopbell, M. C. Britton, R. Ebert, Joseph C. Jacob, Daniel S. Katz, Craig D. Miller, ...
Abstract. The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a...
CACR-170 X-33 Computation performed by the ParNSS code A Pure Java Parallel Flow Solver (2008)
Jochem Hauser, Thorsten Ludewig, Torsten Gollnick, Ralf Winkelmnn, Roy Williams, Jean Muylaert, ...
In this paper an overview is given of the “Have Java ” 2 project to attain a pure Java parallel Navier-Stokes flow solver (JParNSS) based on the thread concept and remote method invocation (RMI)....
A Mobile Agent-Based Architecture for On-Demand Processing of Remote-Sensing Archive (2008)
Yanyan Yang, Omer F. Rana, David W. Walker, Roy Williams
Abstract appears to be promising due to the following reasons: Remote-sensing data about the Earth 5 environment is being created at an ever- increasing rate and distributed among heterogeneous...
1 What is it The NVO Hyperatlas Standard (2008)
the NASA Montage and Polysamp projects provide the trusted software for switching between projections, (b) the large data computing facilities provided by projects such as Teragrid and NASA IPG, and...
HotGrid: Graduated Access to Grid-based Science Gateways (2008)
Roy Williams, Conrad Steenberg, Julian Bunn
Abstract. We describe the idea of a Science Gateway, an applicationspecific task wrapped as a web service, and some examples of these that are being implemented on the US TeraGrid...
Multi-Wavelength Image Space: Another Grid-Enabled Science (2008)
Roy Williams, Bruce Berriman, Ewa Deelman, John Good, Joseph Jacob, Carl Kesselman, ...
We describe how the Grid enables new research possibilities in astronomy through multiwavelength images. To see sky images in the same pixel space, they must be projected to that space, a...
Jim Gray, Alex Szalay, Ani Thakar, Roy Williams, George Djorgovski, Julian Bunn Caltech, ...
• In the beginning science was empirical. • Then theoretical branches evolved. • Now, we have computational branches. – Was primarily simulation – Growth areas: data analysis &...
1. Project Summary MAPS: An Efficient Parallel Language for Scientific Computing (2008)
Roy Williams, Steve Karmesin, Paul Messina
We propose to construct MAPS, a collection-oriented SPMD programming environment for writing parallel programs that will simplify the development and porting of many scientific algorithms, both...
Data-Intensive Computing in the 21st Century (2008)
Gorton, Ian, Greenfield, Paul, Szalay, Alex, Williams, Roy
The deluge of data that future applications must process—in domains ranging from science to business informatics—creates a compelling argument for substantially increased R&D targeted at...
A Paradigm for Parallelism with Spatial Structure (2008)
This paper concerns parallel, local computations with a data structure such a graph or mesh, which may be structured or unstructured. The target machine is a distributed-memory parallel processor...
Paraflow: A Dataflow Distributed Data-Computing System (From Browsing to Teraflops) (2008)
We describe the Paraflow system for connecting heterogeneous computing services together into a flexible and efficient data-mining metacomputer. There are three levels of parallelism: a dataflow...
Regulatory networks define phenotypic classes of human stem cell lines (2008)
Müller, Franz-Josef, Laurent, Louise C., Kostka, Dennis, Ulitsky, Igor, Williams, Roy, Lu, Christina, ...
Stem cells are defined as self-renewing cell populations that can differentiate into multiple distinct cell types. However, hundreds of different human cell lines from embryonic, fetal and adult...
We describe Javaflow and Paraflow, the client and server parts of a digital library, providing high-performance data-retrieval and data-mining services, with emphasis on user interface as well as...
Bob Mann 'z, Roy Williams, Malcolm Atkinson, Ken Brodlie, Amos Storkey, Chris Williams
set of recommendations arising from the discussion that took place there. The aims of the workshop were three-fold: (A) To inform researchers in the SDMIV communities of the infrastructural advances...
Approaches to Federation of Astronomical Data (2007)
We discuss some approaches to rich semantic interoperation of web-based services, so that a user of the Virtual Observatory can create a distributed network of services to read data from archive,...
Concurrent Supercomputing Facility (2007)
Roy Williams, Brian Rasnow, Christopher Assad
We present a simulation of the electrosensory input of the weakly electric fish Apteronotus leptorhynchus. This fish senses its environment by producing a sinusoidal voltage difference between its...
Roy Williams, Gwendolyn Brooks
For having first to civilise a space Wherein to play your violin with grace.
The purpose of this paper is to predict the efficiency of the Navier-Stokes code NSS*, which will run on an MIMD architecture parallel machine. Computations are performed using a three-dimensional...
1 Adaptive Parallel Meshes with Complex Geometry (2007)
We discuss the automatic creation and adaptive refinement of an unstructured mesh within a complex geometry such as the space surrounding an airplane. This may be formulated as two distinct parts; a...
Parallelizing a Real Application Code: Is It Worth It? (2007)
We have studied issues involved in porting a real application to a distributed memory machine while attempting to keep the code efficient and portable. MACH2 is a magnetohydrodynamic simulation code...
Strategies for Approaching Parallel and Numerical Scalability in CFD Codes (2007)
Roy Williams, Jochem Huser, Ralf Winkelmann
In this paper, we consider strategies for achieving the two distinct types of scalability which are the objectives for most parallel scientific software: parallel scalability and numerical...
2 MAPS: An Efficient Parallel Language for Scientific Computing (2007)
Roy Williams, Steve Karmesin, Paul Messina
We propose to construct MAPS, a collection-oriented SPMD programming environment for writing parallel programs that will simplify the development and porting of many scientific algorithms, both...
Scientific Data Mining, Integration, and Visualization Bob Mann (2007)
Roy Williams Malcolm, Bob Mann, Roy Williams, Malcolm Atkinson, Ken Brodlie, Amos Storkey, ...
This report is at http://umbriel.dcs.gla.ac.uk/NeSC/general/talks/sdmiv/report.pdf Executive Summary This report summarises the workshop on Scientific Data Mining, Integration and Visualization...
Grist : grid-based data mining for astronomy (2006)
Jacob, Joseph C., Katz, Daniel S., Miller, Craig D., Walia, Harshpreet, Williams, Roy, Djorgovski, S. George, ...
The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a library of...
Access and visualization using clusters and other parallel computers (2006)
Katz, Daniel S., Bergou, Attila, Berriman, Bruce, Block, Gary, Collier, Jim, Curkendall, Dave, ...
JPL's Parallel Applications Technologies Group has been exploring the issues of data access and visualization of very large data sets over the past 10 or so years. this work has used a number of...
Accessing and Visualizing scientific spatiotemporal data (2006)
Katz, Daniel S., Bergou, Attila, Berriman, Bruce G., Block, Gary L., Collier, Jim, Curkendall, David W., ...
This paper discusses work done by JPL ’s Parallel Applications Technologies Group in helping scientists access and visualize very large data sets through the use of multiple computing resources,...
An Architecture for Scaling NVO Services to TeraGrid (2005)
Williams, Roy, Hanisch, Bob, Jacob, Joe, Plante, Ray, Szalay, Alex
The term “cyberinfrastructure” has been adopted by the US National Science Foundation to mean “advanced computing engines, data archives and digital libraries, observation and sensor systems,...
Accessing and visualizing scientific spatiotemporal data (2005)
Katz, Daniel S., Bergou, Attila, Berriman, G. Bruce, Block, Gary L., Collier, Jim, Curkendall, David W., ...
This paper discusses work done by JPL's Parallel Applications Technologies Group in helping scientists access and visualize very large data sets through the use of multiple computing resources, such...
Solving the context sharing dilemma in knowledge management (2005)
This paper engages with one of the central dilemmas of Knowledge Management: how do we share contextual knowledge? This approaches Knowledge Management differently from the traditional distinction...
Solving the context sharing dilemma in knowledge management (2005)
This paper engages with one of the central dilemmas of Knowledge Management: how do we share contextual knowledge? This approaches Knowledge Management differently from the traditional distinction...
An agent infrastructure for on-demand processing of remote-sensing archives (2005)
Yang, Yanyan, Rana, Omer Farooq, Walker, David William, Williams, Roy, Georgousopoulos, Christos, Caffaro, Massimo, ...
Advances in data collection techniques and database technologies, such as remote sensing and satellite telemetry, have led to the collection of huge amounts of data distributed among large databases...
SOAP Services with Clarens: Guide for Developers and Administrators (2005)
Steenberg, Conrad, Jacob, Joseph C., Williams, Roy
The Clarens application server enables secure, asynchronous SOAP services to run on a Grid cluster such as one of those of the TeraGrid. There is a Client, who wants to use the service and...
Williams, Roy, Connolly, Andrew, Gardner, Jeffrey
The NSF National Virtual Observatory (NVO) is a multiyear effort to build tools, services, registries, protocols, and standards that can extract the full knowledge content of massive, multi-frequency...
Time Domain Explorations With Digital Sky Surveys (2005)
Mahabal, Ashish A., Djorgovski, S. G., Graham, M. J., Kollipara, Priya, Granett, Benjamin, Krause, Elisabeth, ...
One of the new frontiers of astronomical research is the exploration of time variability on the sky at different wavelengths and flux levels. We have carried out a pilot project using DPOSS data to...
Grist: Grid-based Data Mining for Astronomy (2005)
Jacob, Joseph C., Katz, Daniel S., Miller, Craig D., Walia, Harshpreet, Williams, Roy, Djorgovski, S. George, ...
The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a library of...
Meta-semiotics and Practical Epistemology (2005)
Abstract. This paper is a response to debates on Foucault’s articulations of power and regimes of truth, particularly in the recent work of Derek Hook. It is also a response to the specific issue...
Grist: Grid-based Data Mining for Astronomy (2004)
Jacob, Joseph C., Williams, Roy, Babu, Jogesh, Djorgovski, S. George, Graham, Matthew J., Katz, Daniel S., ...
The Grist project (http://grist.caltech.edu/) is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system...
A Virtual Observatory Vision based on Publishing and Virtual Data (2004)
Williams, Roy, Moore, Reagan, Hanisch, Robert
We would like to propose a vision of the Virtual Observatory where the "killer-app" is seen to be generalizing and extending the idea of "publication" from the narrow meaning of peer-reviewed...
Palomar-QUEST: A case study in designing sky surveys in the VO era (2004)
Graham, Matthew J., Williams, Roy, Djorgovski, S. G., Mahabal, Ashish, Baltay, Charles, Rabinowitz, Dave, ...
The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data through- put. VO technology offers a way to exploit these to the full but...
Palomar-QUEST: A case study in designing sky surveys in the VO era (2004)
Graham, Matthew J., Williams, Roy, Djorgovski, S. G., Mahabal, Ashish, Baltay, Charles, Rabinowitz, Dave, ...
The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data throughput. VO technology offers a way to exploit these to the full but...
HotGrid: Graduated Access to Grid-based Science Gateways (2004)
Williams, Roy, Steenberg, Conrad, Bunn, Julian
We describe the idea of a Science Gateway, an application-specific task wrapped as a web service, and some examples of these that are being implemented on the US TeraGrid cyberinfrastructure. We...
HotGrid: Graduated Access to Grid-based Science Gateways (2004)
Roy Williams, Conrad Steenberg, Julian Bunn
We describe the idea of a Science Gateway, an applicationspecific task wrapped as a web service, and some examples of these that are being implemented on the US TeraGrid cyberinfrastructure. We also...
Grids and the Virtual Observatory (2003)
We consider several projects from astronomy that benefit from the Grid paradigm and associated technology, many of which involve either massive datasets or the federation of multiple datasets. We...
Multi-Wavelength Image Space: Another Grid-Enabled Science (2003)
Williams, Roy, Berriman, Bruce, Deelman, Ewa, Good, John, Jacob, Joseph, Kesselman, Carl, ...
We describe a new Grid-enabled branch of astronomy: multi-wavelength images. To see sky images in the same pixel space, they must be projected to that space, a compute-intensive process. There is...
Bob Mann, Roy Williams, Malcolm Atkinson, Ken Brodlie, Amos Storkey, Chris Williams
set of recommendations arising from the discussion that took place there. The aims of the workshop were three-fold: (A) To inform researchers in the SDMIV communities of the infrastructural advances...
Abstract: This paper addresses some key design issues in e-learning, and its integration with knowledge management. The underlying premise is that the purpose of e-learning is useful knowledge, and...
Grids and the Virtual Observatory (2003)
We consider several projects from astronomy that benefit from the Grid paradigm and associated technology, many of which involve either massive datasets or the federation of multiple datasets. We...
Scientific Data Mining, Integration, and Visualization Bob Mann (2003)
Roy Williams Malcolm, Bob Mann, Roy Williams, Malcolm Atkinson, Ken Brodlie, Amos Storkey, ...
This report is at http://umbriel.dcs.gla.ac.uk/NeSC/general/talks/sdmiv/report.pdf Executive Summary This report summarises the workshop on Scientific Data Mining, Integration and Visualization...
Scientific Data Mining, Integration, and Visualization (2002)
Williams, Roy, Mann, Bob, Atkinson, Malcolm, Brodlie, Ken, Storkey, Amos, Williams, Chris
This report summarises the workshop on Scientific Data Mining, Integration and Visualization (SDMIV) held at the e-Science Institute, Edinburgh (eSI[1] ) on 24-25 October 2002, and presents a set of...
XML and Web Services for Astronomers (2002)
Williams, Roy, Brunner, Robert
This tutorial will be a conceptual introduction to XML technologies and their use in Web services, with examples and applications taken from astronomy. It will be assumed that the audience is...
A Virtual Data Grid for LIGO (2001)
Deelman, Ewa, Kesselman, Carl, Williams, Roy, Lazzarini, Albert, Prince, Thomas A., Romano, Joe, ...
GriPhyN (Grid Physics Network) is a large US collaboration to build grid services for large physics experiments, one of which is LIGO, a gravitational-wave observatory. This paper explains the...
A Virtual Data Grid for LIGO (2001)
Deelman, Ewa, Kesselman, Carl, Williams, Roy, Lazzarini, Albert, Prince, Thomas A., Romano, Joe, ...
GriPhyN (Grid Physics Network) is a large US collaboration to build grid services for large physics experiments, one of which is LIGO, a gravitational-wave observatory. This paper explains the...
A DataSpace Infrastructure for Astronomical Data (2001)
Robert Grossman, Emory Creel, Marco Mazzucco, Roy Williams
This article describes an internet infrastructure for working with data called DataSpace. A distributed DataSpace application containing data from the 2MASS and DPOSS astronomical data sets is also...
Ligo -california, Szabolcs Márka, Benoit Mours, Roy Williams
Network Data Analysis Server (NDAS) prototype development
Approaches to Federation of Astronomical Data (2000)
We discuss some approaches to rich semantic interoperation of web-based services, so that a user of the Virtual Observatory can create a distributed network of services to read data from archive,...
Mobile Agent on the SARA Digital Library (2000)
Yang, Yanyan, Rana, Omer F., Walker, David W., Georgousopoulos, Christ, Williams, Roy
Remote-sensing data about the Earth's environment is being created at an ever-increasing rate and distributed among heterogeneous remote sites. Traditional models of distributed computing are...
Web access to Supercomputing using the Grid (2000)
Aloisio, Giovanni, Cafaro, Massimo, Falabella, F. Paolo, Kesselman, Carl, Williams, Roy
Earth Observation Systems (EOS) have provided over the years a tremendous amount of image data covering the surface of the Earth. These images are a potential source of information for lots of users...
Grid Computing on the Web Using the Globus Toolkit (2000)
Giovanni, Aloisio, Cafaro, Massimo, Falabella, Paolo, Kesselman, Carl, Williams, Roy
In this paper we present and discuss an architecture that allows transparent access to remote supercomputing facilities from a web gateway. The implementation exploits the Globus toolkit and provide...
Lecture Notes in Computer Science 1 Grid Computing on the Web Using the Globus Toolkit (2000)
Giovanni Aloisio, Massimo Cafaro, Paolo Falabella, Carl Kesselman, Roy Williams, Giovanni Aloisio, ...
Abstract. In this paper we present and discuss an architecture that allows transparent access to remote supercomputing facilities from a web gateway. The implementation exploits the Globus toolkit...
Mobile agents and the sara digital library (2000)
Christ Georgousopoulos, Yanyan Yang, Yanyan Yang, Omer F. Rana, Omer F. Rana, David W. Walker, ...
Remote-sensing data about the Earth’s environment is being created at an ever-increasing rate and distributed among heterogeneous remote sites. Traditional models of distributed computing are...
The Digital Puglia Project: An Active Digital Library of Remote Sensing Data (1999)
Aloisio, Giovanni, Cafaro, Massimo, Williams, Roy
The growing need of software infrastructure able to create, maintain and ease the evolution of scientific data, promotes the development of digital libraries in order to provide the user with fast...
XSIL: Extensible Scientific Interchange Language (1999)
Blackburn, Kent, Lazzarini, Albert, Prince, Tom, Williams, Roy
We motivate and define the XSIL language as a flexible, hierarchical, extensible transport language for scientific data objects. The entire object may be represented in the file, or there may be...
A Pure Java Parallel Flow Solver (1999)
Hauser, Jochem, Gollnick, Torsten, Winkelmann, Ralf, Williams, Roy, Ludewig, Thorsten, Muylaert, Jean, ...
In this paper an overview is given on the "Have Java" project to attain a pure Java parallel Navier-Stokes flow solver (JParNSS) based on the thread concept and remote method invocation (RMI). The...
The Digital Puglia Project: An Active Digital Library Of Remote Sensing Data (1999)
Giovanni Aloisio, Massimo Cafaro, Roy Williams
. The growing need of software infrastructure able to create, maintain and ease the evolution of scientific data, promotes the development of digital libraries in order to provide the user with fast...
A Pure Java Parallel Flow Solver (1999)
Jochem Häuser, Thorsten Ludewig, Roy Williams, Ralf Winkelmann, Jean Muylaert, ...
1 In this paper an overview is given of the "Have Java" 2 project to attain a pure Java parallel Navier-Stokes flow solver (JParNSS) based on the thread concept and remote method invocation...
Paraflow: A Dataflow Distributed Data-Computing System (From Browsing to Teraflops) (1997)
We describe the Paraflow system for connecting heterogeneous computing services together into a flexible and efficient data-mining metacomputer. There are three levels of parallelism: a dataflow...
A Distributed Web-Based Metacomputing Environment (1997)
Giovanni Aloisio, Massimo Cafaro, Roy Williams, Paul Messina
A High-Performance Active Digital Library (1997)
We describe Javaflow and Paraflow, the client and server parts of a digital library, providing high-performance data-retrieval and data-mining services, with emphasis on user interface as well as...
Applications of numerical analysis in navigation. (1994)
Thesis (Ph. D.)--Open University, 1994.
Unification of spectral and inertial bisection (1994)
We discuss algorithms for graph bisection which are relevant to the distribution of tasks, such as the elements and nodes of an unstructured mesh to the processors of a parallel computer. Starting...
Performance of Dynamic Load Balancing Algorithms for Unstructured Mesh Calculations (1991)
If a finite element mesh has a sufficiently regular structure, it is easy to decide in advance how to distribute the mesh among the processors of a distributed-memory parallel processor, but if the...
Adaptive parallel meshes with complex geometry (1991)
We discuss the automatic creation and adaptive refinement of an unstructured mesh within a complex geometry such as the space surrounding an airplane. This may be formulated as two distinct parts; a...
Williams, Roy, Bell, Andrew, Sims, Gary, Busby, Stephen
We have investigated a number of mutations that alter the ability of the theE.coli transcription factors CRP and FNR to activate transcription. In CRP, some mutations at position 159 (H159L, H159I...
Bell, Andrew, Gaston, Kevin, Williams, Roy, Chapman, Karen, Kolb, Annie, Buc, Henri, ...
The effects of a number of mutations in the E.coli cyclic AMP receptor protein (CRP) have been determined by monitoring the in vivo expression and in vitro open complex formation at two...
Sharpsteen, Ben (realización), Grant, Joe (guión), Huemer, Dick (guión), Tytla, Bill (animación), Wallace, Oliver (música), Churchill, Frank (música), ...
Basado en: Dumbo, the Flying Elephant, de Helen Aberson y Harold Perl