H. Trease - Academia.edu (original) (raw)
Papers by H. Trease
International Journal of …, 1991
Description/Abstract This paper reports on supercomputing at Los Alamos National Laboratory. Los ... more Description/Abstract This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to intertwine the fields of computer science and nuclear science, while influencing the design of the computers needed to solve its scientific ...
Instrumentation for future parallel computing systems, Oct 1, 1989
Center is to provide dissemination possi-of-information DOE's Research and Reports to business, a... more Center is to provide dissemination possi-of-information DOE's Research and Reports to business, academic coinmunit y, contained in Development industry, the and federal, state and local governments. Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the' I. research discussed herein. .
A three-dimensional, time-dependent Free-Lagrange hydrodynamics code has been multitasked and aut... more A three-dimensional, time-dependent Free-Lagrange hydrodynamics code has been multitasked and autotasked on a Cray X-MP/416. The multitasking was done by using the Los Alamos Multitasking Control Library, which is a superset of the Cray multitasking library. Autotasking is done by using constructs which are only comment cards if the source code is not run through a preprocessor. The 3-D algorithm
Toxicology and Industrial Health, 2001
Advances in computational, and imaging techniques have enabled the rapid development of three-dim... more Advances in computational, and imaging techniques have enabled the rapid development of three-dimensional (3-D) models of biological systems in unprecedented detail. Using these advances, 3-D models of the lungs and nasal passages of the rat and human are being developed to ultimately improve predictions of airborne pollutant dosimetry. Techniques for imaging the respiratory tract by magnetic resonance imaging (MRI) were developed to improve the speed and accuracy of geometric data collection for mesh reconstruction. The MRI resolution is comparable to that obtained by manual measurements but at much greater speed and accuracy. Newly developed software (NWGrid) was utilized to translate imaging data from MR into 3-D mesh structures. Together, these approaches significantly reduced the time to develop a 3-D model. This more robust airway structure will ultimately facilitate modeling gas or vapor exchange between the respiratory tract and vasculature as well as enable linkages of dosi...
Engineering with Computers, 2007
Mesh-based PDE simulation codes are becoming increasingly sophisticated and rely on advanced mesh... more Mesh-based PDE simulation codes are becoming increasingly sophisticated and rely on advanced meshing and discretization tools. Unfortunately, it is still difficult to interchange or interoperate tools developed by different communities to experiment with various technologies or to develop new capabilities. To address these difficulties, we have developed component interfaces designed to support the information flow of mesh-based PDE simulations. We describe this information flow and discuss typical roles and services provided by the geometry, mesh, and field components of the simulation. Based on this delineation for the roles of each component, we give a high-level description of the abstract data model and set of interfaces developed by the Department of Energy's Interoperable Tools for Advanced Petascale Simulation (ITAPS) center. These common interfaces are critical to our interoperability goal, and we give examples of several services based upon these interfaces including mesh adaptation and mesh improvement.
Journal of Physics: Conference Series, 2007
SciDAC applications have a demonstrated need for advanced software tools to manage the complexiti... more SciDAC applications have a demonstrated need for advanced software tools to manage the complexities associated with sophisticated geometry, mesh, and field manipulation tasks, particularly as computer architectures move toward the petascale. The Center for Interoperable Technologies for Advanced Petascale Simulations (ITAPS) will deliver interoperable and interchangeable mesh, geometry, and field manipulation services that are of direct use to SciDAC applications. The premise of our technology development goal is to provide such services as libraries that can be used with minimal intrusion into application codes. To develop these technologies, we focus on defining a common data model and data-structure neutral interfaces that unify a number of different services such as mesh generation and improvement, front tracking, adaptive mesh refinement, shape optimization, and solution transfer operations. We highlight the use of several ITAPS services in SciDAC applications.
International Journal of High Performance Computing Applications, 1991
This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to ... more This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to intertwine the fields of computer science and nuclear science, while influencing the design of the computers needed to solve its scientific problems. The complexity and size of the applications prevalent at the Laboratory have dictated a continuing, ever-increasing need for computers one to two orders of magnitude faster than what is currently available. There are currently four CRAY Y-MPs and four X-MPs serving as production computers. The Central Computing Facility (CCF) and the Laboratory Data Communications Center (LDCC), a three-story building completed in 1989, house the supercomputers and associated network servers.
Description/Abstract A time-dependent, three-dimensional, compressible, multicomponent, free-Lagr... more Description/Abstract A time-dependent, three-dimensional, compressible, multicomponent, free-Lagrange code is currently under development at the Los Alamos National Laboratory. The code uses fixed-mass particles (called mass points) surrounded by median ...
Advances in the Free-Lagrange Method Including …, 1991
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This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes amy legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
… , Proceedings of the …, 1995
Page 1. CONTRIBUTIONS FROM THE DOE CENTER FOR SEMICONDUCTOR MODELING AND SIMULATION R. C. Albers,... more Page 1. CONTRIBUTIONS FROM THE DOE CENTER FOR SEMICONDUCTOR MODELING AND SIMULATION R. C. Albers, D. C. Cartwright, D. C. George, JD Kress, T J. Kwan, R. A. Nebel, PD Soran, G. K. Straub, HE Trease, RB Walker Los Alamos National Laboratory ...
International Journal of High Performance Computing Applications, 1989
A three-dimensional, time-dependent free-Lagrange hy drodynamics code has been multitasked and au... more A three-dimensional, time-dependent free-Lagrange hy drodynamics code has been multitasked and autotasked on a CRAY X-MP/416. The multitasking was done by using the Los Alamos Multitasking Control Library, which is a superset of the CRAY multitasking library. Autotasking is done by using constructs which are only comment cards if the source code is not run through a preprocessor. The three-dimensional
Advances in the Free-Lagrange Method Including …, 1991
... 3. Manjit Sahota, "Three-Dimensional Free-Lagrangian Hydrodynamics", Los Al... more ... 3. Manjit Sahota, "Three-Dimensional Free-Lagrangian Hydrodynamics", Los Alamos National Laboratory report, LA-UP~-89-11-79, 1989. 4 ... communication. 5. Manjit Sahota, Los Alamos National Laboratory, private communication.
… Computing, Arlington, VA, 29 Mar.-1 …, 1993
We investigate the feasibility of using massively parallel Single Instruction Multiple Data (SIMD... more We investigate the feasibility of using massively parallel Single Instruction Multiple Data (SIMD) and Multiple Instruction Multiple Data (MIMD) computer architectures for explicit three-dimensional unstructured-grid finite-element Lagrange and finite-volume free-...
Computer Physics Communications, 1988
A major purpose of the Technical Information Center is to provide the broadest dissemination poss... more A major purpose of the Technical Information Center is to provide the broadest dissemination possible of infc)rmation contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments. Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the. rese~rch discussed herein.
Various papers on the Free-Lagrange method are presented. Individual topics addressed include: Fr... more Various papers on the Free-Lagrange method are presented. Individual topics addressed include: Free-Lagrange methods for compressible hydrodynamics in two space dimensions; finite difference operators on unstructured triangular meshes; a Lagrangian method for the incompressible Navier-Stokes equations on a periodic domain; Free-Lagrangian methods, independent time steps, and parallel processing; three-dimensional algorithms for grid restructuring in Free-Lagrangian calculations; and three-dimensional Free-Lagrangian hydrodynamics.
International Journal of …, 1991
Description/Abstract This paper reports on supercomputing at Los Alamos National Laboratory. Los ... more Description/Abstract This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to intertwine the fields of computer science and nuclear science, while influencing the design of the computers needed to solve its scientific ...
Instrumentation for future parallel computing systems, Oct 1, 1989
Center is to provide dissemination possi-of-information DOE's Research and Reports to business, a... more Center is to provide dissemination possi-of-information DOE's Research and Reports to business, academic coinmunit y, contained in Development industry, the and federal, state and local governments. Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the' I. research discussed herein. .
A three-dimensional, time-dependent Free-Lagrange hydrodynamics code has been multitasked and aut... more A three-dimensional, time-dependent Free-Lagrange hydrodynamics code has been multitasked and autotasked on a Cray X-MP/416. The multitasking was done by using the Los Alamos Multitasking Control Library, which is a superset of the Cray multitasking library. Autotasking is done by using constructs which are only comment cards if the source code is not run through a preprocessor. The 3-D algorithm
Toxicology and Industrial Health, 2001
Advances in computational, and imaging techniques have enabled the rapid development of three-dim... more Advances in computational, and imaging techniques have enabled the rapid development of three-dimensional (3-D) models of biological systems in unprecedented detail. Using these advances, 3-D models of the lungs and nasal passages of the rat and human are being developed to ultimately improve predictions of airborne pollutant dosimetry. Techniques for imaging the respiratory tract by magnetic resonance imaging (MRI) were developed to improve the speed and accuracy of geometric data collection for mesh reconstruction. The MRI resolution is comparable to that obtained by manual measurements but at much greater speed and accuracy. Newly developed software (NWGrid) was utilized to translate imaging data from MR into 3-D mesh structures. Together, these approaches significantly reduced the time to develop a 3-D model. This more robust airway structure will ultimately facilitate modeling gas or vapor exchange between the respiratory tract and vasculature as well as enable linkages of dosi...
Engineering with Computers, 2007
Mesh-based PDE simulation codes are becoming increasingly sophisticated and rely on advanced mesh... more Mesh-based PDE simulation codes are becoming increasingly sophisticated and rely on advanced meshing and discretization tools. Unfortunately, it is still difficult to interchange or interoperate tools developed by different communities to experiment with various technologies or to develop new capabilities. To address these difficulties, we have developed component interfaces designed to support the information flow of mesh-based PDE simulations. We describe this information flow and discuss typical roles and services provided by the geometry, mesh, and field components of the simulation. Based on this delineation for the roles of each component, we give a high-level description of the abstract data model and set of interfaces developed by the Department of Energy's Interoperable Tools for Advanced Petascale Simulation (ITAPS) center. These common interfaces are critical to our interoperability goal, and we give examples of several services based upon these interfaces including mesh adaptation and mesh improvement.
Journal of Physics: Conference Series, 2007
SciDAC applications have a demonstrated need for advanced software tools to manage the complexiti... more SciDAC applications have a demonstrated need for advanced software tools to manage the complexities associated with sophisticated geometry, mesh, and field manipulation tasks, particularly as computer architectures move toward the petascale. The Center for Interoperable Technologies for Advanced Petascale Simulations (ITAPS) will deliver interoperable and interchangeable mesh, geometry, and field manipulation services that are of direct use to SciDAC applications. The premise of our technology development goal is to provide such services as libraries that can be used with minimal intrusion into application codes. To develop these technologies, we focus on defining a common data model and data-structure neutral interfaces that unify a number of different services such as mesh generation and improvement, front tracking, adaptive mesh refinement, shape optimization, and solution transfer operations. We highlight the use of several ITAPS services in SciDAC applications.
International Journal of High Performance Computing Applications, 1991
This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to ... more This paper reports on supercomputing at Los Alamos National Laboratory. Los Alamos has sought to intertwine the fields of computer science and nuclear science, while influencing the design of the computers needed to solve its scientific problems. The complexity and size of the applications prevalent at the Laboratory have dictated a continuing, ever-increasing need for computers one to two orders of magnitude faster than what is currently available. There are currently four CRAY Y-MPs and four X-MPs serving as production computers. The Central Computing Facility (CCF) and the Laboratory Data Communications Center (LDCC), a three-story building completed in 1989, house the supercomputers and associated network servers.
Description/Abstract A time-dependent, three-dimensional, compressible, multicomponent, free-Lagr... more Description/Abstract A time-dependent, three-dimensional, compressible, multicomponent, free-Lagrange code is currently under development at the Los Alamos National Laboratory. The code uses fixed-mass particles (called mass points) surrounded by median ...
Advances in the Free-Lagrange Method Including …, 1991
This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes amy legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
… , Proceedings of the …, 1995
Page 1. CONTRIBUTIONS FROM THE DOE CENTER FOR SEMICONDUCTOR MODELING AND SIMULATION R. C. Albers,... more Page 1. CONTRIBUTIONS FROM THE DOE CENTER FOR SEMICONDUCTOR MODELING AND SIMULATION R. C. Albers, D. C. Cartwright, D. C. George, JD Kress, T J. Kwan, R. A. Nebel, PD Soran, G. K. Straub, HE Trease, RB Walker Los Alamos National Laboratory ...
International Journal of High Performance Computing Applications, 1989
A three-dimensional, time-dependent free-Lagrange hy drodynamics code has been multitasked and au... more A three-dimensional, time-dependent free-Lagrange hy drodynamics code has been multitasked and autotasked on a CRAY X-MP/416. The multitasking was done by using the Los Alamos Multitasking Control Library, which is a superset of the CRAY multitasking library. Autotasking is done by using constructs which are only comment cards if the source code is not run through a preprocessor. The three-dimensional
Advances in the Free-Lagrange Method Including …, 1991
... 3. Manjit Sahota, "Three-Dimensional Free-Lagrangian Hydrodynamics", Los Al... more ... 3. Manjit Sahota, "Three-Dimensional Free-Lagrangian Hydrodynamics", Los Alamos National Laboratory report, LA-UP~-89-11-79, 1989. 4 ... communication. 5. Manjit Sahota, Los Alamos National Laboratory, private communication.
… Computing, Arlington, VA, 29 Mar.-1 …, 1993
We investigate the feasibility of using massively parallel Single Instruction Multiple Data (SIMD... more We investigate the feasibility of using massively parallel Single Instruction Multiple Data (SIMD) and Multiple Instruction Multiple Data (MIMD) computer architectures for explicit three-dimensional unstructured-grid finite-element Lagrange and finite-volume free-...
Computer Physics Communications, 1988
A major purpose of the Technical Information Center is to provide the broadest dissemination poss... more A major purpose of the Technical Information Center is to provide the broadest dissemination possible of infc)rmation contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments. Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the. rese~rch discussed herein.
Various papers on the Free-Lagrange method are presented. Individual topics addressed include: Fr... more Various papers on the Free-Lagrange method are presented. Individual topics addressed include: Free-Lagrange methods for compressible hydrodynamics in two space dimensions; finite difference operators on unstructured triangular meshes; a Lagrangian method for the incompressible Navier-Stokes equations on a periodic domain; Free-Lagrangian methods, independent time steps, and parallel processing; three-dimensional algorithms for grid restructuring in Free-Lagrangian calculations; and three-dimensional Free-Lagrangian hydrodynamics.