This paper develops an initialization procedure for cold-starting the Semi-spectral Primitive Equ... more This paper develops an initialization procedure for cold-starting the Semi-spectral Primitive Equation Model (SPEM) for one week forecasts in the Gulf Stream region. Six case studies during May 6-13-20, 1987, July 7-14-21, 1987, and May 4-11-18, 1988, are included in this study, and selected forecasts from these runs are discussed in depth. We develop the initialization procedure, and then discuss the known problems with the method. We discuss the evolution of the Gulf Stream region during these time periods and qualitatively compare our model results against data. We also show, using a quantitative measure of skill, that the model has forecast skill when compared with persistence. The initialization method discussed is general, physically consistent, and applicable to other ocean models.
A Cessna 525B citation CJ3 (a stretched variant of the 525A Citation CJ2) was involved in an on-g... more A Cessna 525B citation CJ3 (a stretched variant of the 525A Citation CJ2) was involved in an on-ground horizontal crash that occurred between a fast moving car and a towed airplane. The Avionics packages were not bench tested before being declared acceptable for continued usage by the manufacturer. A search of the FAA crash and hard landings web listings (Boeing, 2011) revealed few similar and no identical accidents; no statistics were available upon which to base a declaration of acceptable usage. Further, we could not locate comprehensive horizontal impact research articles. In this paper we present a component level analysis of inferred damage within the CJ3’savionic equipment that one may reasonably expect to find with sufficient horizontal impact, based on existing component part and PCB board analysis. This study of the individual component parts tests serves as a proxy for these needed drop tests and statistical analysis (albeit with unspecified accuracy). This generic damag...
Abstract We describe the use of Hyper Text Markup Language (HTML), JavaScript code, and Perl I/O ... more Abstract We describe the use of Hyper Text Markup Language (HTML), JavaScript code, and Perl I/O to create and validate forms in an Internet-based graphical user interface (GUI) for the Naval Research Laboratory (NRL) Ocean models and Assimilation Demonstration System (NOMADS). The resulting nowcast system can be operated from any compatible browser across the Internet, for although the GUI was prepared in a Netscape browser, it used no Netscape extensions. Code available at: http://www.iamg.org/CGEditor/index.htm
We present a method to solve the heat equation that couples mesh refinement with explicit time st... more We present a method to solve the heat equation that couples mesh refinement with explicit time steps greater than the Courant condition limit. The method is implemented in parallel and executes efficiently.
This paper details the ongoing work of combining three existing software programs into a nested g... more This paper details the ongoing work of combining three existing software programs into a nested grid oceanography model. The HYPER domain decomposition program [8], the SPEM ocean modeling program [5] and a Quasi-Geostrophy model written in England are being combined into a general ocean modeling facility. This facility will be used to test the viability and the capability of two-way nested grids in the North Atlantic.
This paper discusses some of the directions being taken in the development of numerical algorithm... more This paper discusses some of the directions being taken in the development of numerical algorithms that can be efficiently executed on vector and parallel computers. Heretofore, most of the research has been on developing parallel algorithms for solving a linear system of equations. A ...
Over the past three decades, the computer has emerged as one of the most heavily used tools for s... more Over the past three decades, the computer has emerged as one of the most heavily used tools for scientific research. The reason for this is somewhat obvious in that electronic and communication technology has progressed to a state where the computer can be used by scientists and ...
Abstract We developed a biased domain decomposition clustering algorithm designed for use in our ... more Abstract We developed a biased domain decomposition clustering algorithm designed for use in our parallel processing program for the numerical solution of partial differential equations. The biased clustering algorithm is designed to work on a distributed memory ...
A large two-dimensional fortran array is used to simulate a two-dimensional memory. The two-dimen... more A large two-dimensional fortran array is used to simulate a two-dimensional memory. The two-dimensional memory management scheme is discussed in detail, and an optimal two-dimensional scheme is established. The scheme is designed to reduce the need to copy ...
This paper develops an initialization procedure for cold-starting the Semi-spectral Primitive Equ... more This paper develops an initialization procedure for cold-starting the Semi-spectral Primitive Equation Model (SPEM) for one week forecasts in the Gulf Stream region. Six case studies during May 6-13-20, 1987, July 7-14-21, 1987, and May 4-11-18, 1988, are included in this study, and selected forecasts from these runs are discussed in depth. We develop the initialization procedure, and then discuss the known problems with the method. We discuss the evolution of the Gulf Stream region during these time periods and qualitatively compare our model results against data. We also show, using a quantitative measure of skill, that the model has forecast skill when compared with persistence. The initialization method discussed is general, physically consistent, and applicable to other ocean models.
A Cessna 525B citation CJ3 (a stretched variant of the 525A Citation CJ2) was involved in an on-g... more A Cessna 525B citation CJ3 (a stretched variant of the 525A Citation CJ2) was involved in an on-ground horizontal crash that occurred between a fast moving car and a towed airplane. The Avionics packages were not bench tested before being declared acceptable for continued usage by the manufacturer. A search of the FAA crash and hard landings web listings (Boeing, 2011) revealed few similar and no identical accidents; no statistics were available upon which to base a declaration of acceptable usage. Further, we could not locate comprehensive horizontal impact research articles. In this paper we present a component level analysis of inferred damage within the CJ3’savionic equipment that one may reasonably expect to find with sufficient horizontal impact, based on existing component part and PCB board analysis. This study of the individual component parts tests serves as a proxy for these needed drop tests and statistical analysis (albeit with unspecified accuracy). This generic damag...
Abstract We describe the use of Hyper Text Markup Language (HTML), JavaScript code, and Perl I/O ... more Abstract We describe the use of Hyper Text Markup Language (HTML), JavaScript code, and Perl I/O to create and validate forms in an Internet-based graphical user interface (GUI) for the Naval Research Laboratory (NRL) Ocean models and Assimilation Demonstration System (NOMADS). The resulting nowcast system can be operated from any compatible browser across the Internet, for although the GUI was prepared in a Netscape browser, it used no Netscape extensions. Code available at: http://www.iamg.org/CGEditor/index.htm
We present a method to solve the heat equation that couples mesh refinement with explicit time st... more We present a method to solve the heat equation that couples mesh refinement with explicit time steps greater than the Courant condition limit. The method is implemented in parallel and executes efficiently.
This paper details the ongoing work of combining three existing software programs into a nested g... more This paper details the ongoing work of combining three existing software programs into a nested grid oceanography model. The HYPER domain decomposition program [8], the SPEM ocean modeling program [5] and a Quasi-Geostrophy model written in England are being combined into a general ocean modeling facility. This facility will be used to test the viability and the capability of two-way nested grids in the North Atlantic.
This paper discusses some of the directions being taken in the development of numerical algorithm... more This paper discusses some of the directions being taken in the development of numerical algorithms that can be efficiently executed on vector and parallel computers. Heretofore, most of the research has been on developing parallel algorithms for solving a linear system of equations. A ...
Over the past three decades, the computer has emerged as one of the most heavily used tools for s... more Over the past three decades, the computer has emerged as one of the most heavily used tools for scientific research. The reason for this is somewhat obvious in that electronic and communication technology has progressed to a state where the computer can be used by scientists and ...
Abstract We developed a biased domain decomposition clustering algorithm designed for use in our ... more Abstract We developed a biased domain decomposition clustering algorithm designed for use in our parallel processing program for the numerical solution of partial differential equations. The biased clustering algorithm is designed to work on a distributed memory ...
A large two-dimensional fortran array is used to simulate a two-dimensional memory. The two-dimen... more A large two-dimensional fortran array is used to simulate a two-dimensional memory. The two-dimensional memory management scheme is discussed in detail, and an optimal two-dimensional scheme is established. The scheme is designed to reduce the need to copy ...
Uploads
Papers by Louise Perkins