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14,612 Matching Results
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Reducing communication inefficiencies for a flexible programming paradigm
The ACPMAPS system at Fermilab has been upgraded to 50 GF by inserting new CPU modules, based on the Intel i860. This ten-fold increase in power, utilizing the identical communications backbone, places the system in a different realm: The transfer latency and overheads are now greater, relative to the cost of a floating point operation. We explore the consequences for programs written using CANOPY, which relies on low communications latencies. We present techniques for alleviating the efficiency decrease, by coalescing transfers, without abandoning the considerable advantages of the CANOPY paradigm.
Date:
November 1, 1992
Creator:
Fischler, M.; Gao, M.; Hockney, G.; Isely, M. & Uchima, M.
Object Type:
Article
System:
The UNT Digital Library
Reducing communication inefficiencies for a flexible programming paradigm
The ACPMAPS system at Fermilab has been upgraded to 50 GF by inserting new CPU modules, based on the Intel i860. This ten-fold increase in power, utilizing the identical communications backbone, places the system in a different realm: The transfer latency and overheads are now greater, relative to the cost of a floating point operation. We explore the consequences for programs written using CANOPY, which relies on low communications latencies. We present techniques for alleviating the efficiency decrease, by coalescing transfers, without abandoning the considerable advantages of the CANOPY paradigm.
Date:
November 1, 1992
Creator:
Fischler, M.; Gao, M.; Hockney, G.; Isely, M. & Uchima, M.
Object Type:
Article
System:
The UNT Digital Library
The intergroup protocols: Scalable group communication for the internet
Reliable group ordered delivery of multicast messages in a distributed system is a useful service that simplifies the programming of distributed applications. Such a service helps to maintain the consistency of replicated information and to coordinate the activities of the various processes. With the increasing popularity of the Internet, there is an increasing interest in scaling the protocols that provide this service to the environment of the Internet. The InterGroup protocol suite, described in this dissertation, provides such a service, and is intended for the environment of the Internet with scalability to large numbers of nodes and high latency links. The InterGroup protocols approach the scalability problem from various directions. They redefine the meaning of group membership, allow voluntary membership changes, add a receiver-oriented selection of delivery guarantees that permits heterogeneity of the receiver set, and provide a scalable reliability service. The InterGroup system comprises several components, executing at various sites within the system. Each component provides part of the services necessary to implement a group communication system for the wide-area. The components can be categorized as: (1) control hierarchy, (2) reliable multicast, (3) message distribution and delivery, and (4) process group membership. We have implemented a prototype of the …
Date:
November 1, 2000
Creator:
Berket, K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Media and Communication Industries: A 21st Century Perspective
Article discussing a 21st century perspective on the media and communication industry.
Date:
November 2010
Creator:
Albarran, Alan B.
Object Type:
Article
System:
The UNT Digital Library
Communication Requirements and Interconnect Optimization forHigh-End Scientific Applications
The path towards realizing peta-scale computing isincreasingly dependent on building supercomputers with unprecedentednumbers of processors. To prevent the interconnect from dominating theoverall cost of these ultra-scale systems, there is a critical need forhigh-performance network solutions whose costs scale linearly with systemsize. This work makes several unique contributions towards attaining thatgoal. First, we conduct one of the broadest studies to date of high-endapplication communication requirements, whose computational methodsinclude: finite-difference, lattice-bolzmann, particle in cell, sparselinear algebra, particle mesh ewald, and FFT-based solvers. Toefficiently collect this data, we use the IPM (Integrated PerformanceMonitoring) profiling layer to gather detailed messaging statistics withminimal impact to code performance. Using the derived communicationcharacterizations, we next present fit-trees interconnects, a novelapproach for designing network infrastructure at a fraction of thecomponent cost of traditional fat-tree solutions. Finally, we propose theHybrid Flexibly Assignable Switch Topology (HFAST) infrastructure, whichuses both passive (circuit) and active (packet) commodity switchcomponents to dynamically reconfigure interconnects to suit thetopological requirements of scientific applications. Overall ourexploration leads to a promising directions for practically addressingthe interconnect requirements of future peta-scale systems.
Date:
November 12, 2007
Creator:
Kamil, Shoaib; Oliker, Leonid; Pinar, Ali & Shalf, John
Object Type:
Article
System:
The UNT Digital Library
3rd ASM Conference on Cell-Cell Communication in Bacteria
This report summarizes the final program and provides the abstracts presented at the fourth American Society of Microbiology-sponsored conference on Cell-cell Communication in Bacteria, held November 6-9, 2011 in Miami, Florida. Bacteria are the paradigm for unicellular life, yet they also exhibit elaborate coordinated behaviors that often defy unicellularity. Research over the past two decades has revealed that a wide range of microbes communicate by diverse mechanisms. In most cases these microbial conversations occur through the exchange of diffusible signals, although there are also clear examples of contact-dependent communication. Many microbes use these signaling mechanisms to monitor and respond to population density, a process often described as quorum sensing. Interbacterial communication is not, however restricted to quorum sensing mechanisms, and there is mounting evidence that signaling can function in a range of different capacities. Communication between microorganisms has profound impacts on host interactions, as pathogens and commensals often regulate factors critical for interaction with their hosts via signal production and perception. The CCCB-4 conference provided a unique forum for the discussion, dissemination and exchange of new information and ideas among researchers working within this rapidly developing, yet mature field. Sessions were arranged around topics such as: the diversity of signal …
Date:
November 6, 2011
Creator:
Nalker, Lisa K.
Object Type:
Article
System:
The UNT Digital Library
RADIOASTRONOMY AND COMMUNICATION THROUGH SPACE. Brookhaven Lecture Series Number 1
The lecture contains discussions on developments in radioastronomy, requirements for space travel to a place 12 light years away, and speculations for communicating through space. (B.O.G.)
Date:
November 16, 1960
Creator:
Purcell, E.
Object Type:
Report
System:
The UNT Digital Library
Spatial Analysis and visual Communication of Emergency Information through Augmented Reality
Article describes how during emergencies like fire and smoke or active shooter events, there is a need to address the vulnerability and assess plans for evacuation. This paper presents the development and evaluation of the mobile augmented reality application designed specifically for acquiring spatial analysis, situational awareness, and visual communication.
Date:
November 2023
Creator:
Sharma, Sharad & Pesaladinne, Rishitha R.
Object Type:
Article
System:
The UNT Digital Library
Performance Analysis of Distributed Applications using Automatic Classification of Communication Inefficiencies
We present a technique for performance analysis that helps users understand the communication behavior of their message passing applications. Our method automatically classifies individual communication operations and it reveals the cause of communication inefficiencies in the application. This classification allows the developer to focus quickly on the culprits of truly inefficient behavior, rather than manually foraging through massive amounts of performance data. Specifically, we trace the message operations of MPI applications and then classify each individual communication event using decision tree classification, a supervised learning technique. We train our decision tree using microbenchmarks that demonstrate both efficient and inefficient communication. Since our technique adapts to the target system's configuration through these microbenchmarks, we can simultaneously automate the performance analysis process and improve classification accuracy. Our experiments on four applications demonstrate that our technique can improve the accuracy of performance analysis, and dramatically reduce the amount of data that users must encounter.
Date:
November 1, 1999
Creator:
Vetter, J.
Object Type:
Article
System:
The UNT Digital Library
Optical Communication System for Remote Monitoring and Adaptive Control of Distributed Ground Sensors Exhibiting Collective Intelligence
Comprehensive management of the battle-space has created new requirements in information management, communication, and interoperability as they effect surveillance and situational awareness. The objective of this proposal is to expand intelligent controls theory to produce a uniquely powerful implementation of distributed ground-based measurement incorporating both local collective behavior, and interoperative global optimization for sensor fusion and mission oversight. By using a layered hierarchal control architecture to orchestrate adaptive reconfiguration of autonomous robotic agents, we can improve overall robustness and functionality in dynamic tactical environments without information bottlenecks. In this concept, each sensor is equipped with a miniaturized optical reflectance modulator which is interactively monitored as a remote transponder using a covert laser communication protocol from a remote mothership or operative. Robot data-sharing at the ground level can be leveraged with global evaluation criteria, including terrain overlays and remote imaging data. Information sharing and distributed intelli- gence opens up a new class of remote-sensing applications in which small single-function autono- mous observers at the local level can collectively optimize and measure large scale ground-level signals. AS the need for coverage and the number of agents grows to improve spatial resolution, cooperative behavior orchestrated by a global situational awareness umbrella will be …
Date:
November 1, 1998
Creator:
Cameron, S. M.; Stantz, K. M.; Trahan, M. W. & Wagner, J. S.
Object Type:
Report
System:
The UNT Digital Library
Salinas : theory manual.
Salinas provides a massively parallel implementation of structural dynamics finite element analysis, required for high fidelity, validated models used in modal, vibration, static and shock analysis of structural systems. This manual describes the theory behind many of the constructs in Salinas. For a more detailed description of how to use Salinas, we refer the reader to Salinas, User's Notes. Many of the constructs in Salinas are pulled directly from published material. Where possible, these materials are referenced herein. However, certain functions in Salinas are specific to our implementation. We try to be far more complete in those areas. The theory manual was developed from several sources including general notes, a programmer notes manual, the user's notes and of course the material in the open literature.
Date:
November 1, 2011
Creator:
Walsh, Timothy Francis; Reese, Garth M. & Bhardwaj, Manoj Kumar
Object Type:
Report
System:
The UNT Digital Library
Three dimensional visualization breakthrough in analysis and communication of technical information for nuclear waste management
Computer graphics systems that provide interactive display and manipulation of three-dimensional data are powerful tools for the analysis and communication of technical information required for characterization and design of a geologic repository for nuclear waste. Greater understanding of site performance and repository design information is possible when performance-assessment modeling results can be visually analyzed in relation to site geologic and hydrologic information and engineering data for surface and subsurface facilities. In turn, this enhanced visualization capability provides better communication between technical staff and program management with respect to analysis of available information and prioritization of program planning. A commercially-available computer system was used to demonstrate some of the current technology for three-dimensional visualization within the architecture of systems for nuclear waste management. This computer system was used to interactively visualize and analyze the information for two examples: (1) site-characterization and engineering data for a potential geologic repository at Yucca Mountain, Nevada; and (2) three-dimensional simulations of a hypothetical release and transport of contaminants from a source of radionuclides to the vadose zone. Users may assess the three-dimensional distribution of data and modeling results by interactive zooming, rotating, slicing, and peeling operations. For those parts of the database where information is …
Date:
November 1, 1990
Creator:
Alexander, D. H.; Cerny, B. A.; Hill, E. R.; Krupka, K. M.; Smoot, J. L.; Smith, D. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Quantum theory and the emergence of patterns in the universe
The topic of this symposium is the quest to discover, define, and interpret patterns in the universe. This quest has two parts. To discover and define these patterns is the task of science: this part of the quest is producing a copious flow of reliable information. To interpret or give meaning to these patterns is the task of natural philosophy: this part has not kept pace.
Date:
November 1, 1989
Creator:
Stapp, H. P.
Object Type:
Article
System:
The UNT Digital Library
Quantum theory and the emergence of patterns in the universe
The topic of this symposium is the quest to discover, define, and interpret patterns in the universe. This quest has two parts. To discover and define these patterns is the task of science: this part of the quest is producing a copious flow of reliable information. To interpret or give meaning to these patterns is the task of natural philosophy: this part has not kept pace.
Date:
November 1, 1989
Creator:
Stapp, H. P.
Object Type:
Article
System:
The UNT Digital Library
The Role of the Invariant Line in the Search for an Optimum Interphase Boundary by O-Lattice Theory
The purpose of the present communication is threefold: -to demonstrate that the interphase boundary determined by Plichta and Aaronson (PA) can be shown analytically to have the lowest energy parameter P of all possible O-lattice boundaries. -to explain the significance of the calculated 0.05{degrees} rotation around [0001] and its relationship to the more general principle of an invariant line. -to show that the optimum interphase boundaries are generally quite different for coherent and semicoherent precipitates having the same Burgers orientation relationship (OR) with the matrix.
Date:
November 1, 1980
Creator:
Dahmen, U.
Object Type:
Article
System:
The UNT Digital Library
ON THE THEORY OF MIGRATION AND COALESCENCE OF BUBBLES IN SOLIDS
None
Date:
November 1, 1965
Creator:
Gruber, E.E.
Object Type:
Report
System:
The UNT Digital Library
Application of semiclassical methods to reaction rate theory
This work is concerned with the development of approximate methods to describe relatively large chemical systems. This effort has been divided into two primary directions: First, we have extended and applied a semiclassical transition state theory (SCTST) originally proposed by Miller to obtain microcanonical and canonical (thermal) rates for chemical reactions described by a nonseparable Hamiltonian, i.e. most reactions. Second, we have developed a method to describe the fluctuations of decay rates of individual energy states from the average RRKM rate in systems where the direct calculation of individual rates would be impossible. Combined with the semiclassical theory this latter effort has provided a direct comparison to the experimental results of Moore and coworkers. In SCTST, the Hamiltonian is expanded about the barrier and the ``good`` action-angle variables are obtained perturbatively; a WKB analysis of the effectively one-dimensional reactive direction then provides the transmission probabilities. The advantages of this local approximate treatment are that it includes tunneling effects and anharmonicity, and it systematically provides a multi-dimensional dividing surface in phase space. The SCTST thermal rate expression has been reformulated providing increased numerical efficiency (as compared to a naive Boltzmann average), an appealing link to conventional transition state theory (involving a …
Date:
November 1, 1993
Creator:
Hernandez, R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Status of glueball mass calculations in lattice gauge theory
The status of glueball spectrum calculations in lattice gauge theory is briefly reviewed, with focus on the comparison between Monte Carlo simulations and small-volume analytical calculations in SU(3). The agreement gives confidence that the large-volume Monte Carlo results are accurate, at least in the context of the pure gauge theory. An overview of some of the technical questions, which is aimed at non-experts, serves as an introduction. 19 refs., 1 fig.
Date:
November 1, 1989
Creator:
Kronfeld, A.S.
Object Type:
Article
System:
The UNT Digital Library
Microstability theory for the field reversed configuration. Final report
This report summarizes the work done in the last contract period. Previous work has been described in Annual Performance Reports. The work carried on under this Research Grant and not included in previous progress and annual reports includes two distinct items. One work is a study of the nonlocal high beta microstability of the FRC (Field Reversed Configuration), which they began sometime ago. This study identified the limiting beta (=4{pi}nT/B{sup 2}) for the mode to remain unstable. The study found that as beta increases, the wavenumbers (k{sub y}, K{sub z}) for maximum growth changes, so that the limiting beta is not the one found by fixing (k{sub y}, K{sub z}) and increasing beta. It also appears that the criterion for nonlocal terms to influence the result, as beta increases, is substantially weaker than might have been thought. The authors identify the parameter that determines this effect. This study is presented as Appendix 1 of this report. The second study is of the effect of collisions on the lower hybrid drift instability. The result is that the effect of collisions is substantially more important than might have been expected. These two studies are in different stages of completion. The second is …
Date:
November 5, 1997
Creator:
Krall, Nicholas A.
Object Type:
Report
System:
The UNT Digital Library
Theory of surface morphology of wurtzite GaN (0001) surfaces
Article on the theory of surface morphology of wurtzite GaN (0001) surfaces.
Date:
November 15, 1997
Creator:
Rapcewicz, Krzysztof; Buongiorno Nardelli, Marco & Bernholc, Jerry
Object Type:
Article
System:
The UNT Digital Library
Theory of HF induced turbulence in the ionosphere: Status and challenges
None
Date:
November 1, 1994
Creator:
DuBois, D. F.
Object Type:
Article
System:
The UNT Digital Library
SIERRA Framework Version 3: Core Services Theory and Design
The SIERRA Framework core services provide essential services for managing the mesh data structure, computational fields, and physics models of an application. An application using these services will supply a set of physics models, define the computational fields that are required by those models, and define the mesh upon which its physics models operate. The SIERRA Framework then manages all of the data for a massively parallel multiphysics application.
Date:
November 1, 2002
Creator:
EDWARDS, HAROLD C.
Object Type:
Report
System:
The UNT Digital Library
Pulsed-laser annealing of ion-implanted GaAs: theory and experiment
It is shown that, in the pulsed-laser irradiation of crystalline or lightly damaged GaAs, good agreement is obtained between measured and calculated thresholds for melting, for catastrophic damage due to vaporization, and for the duration of surface melting at various energy densities. Good agreement between theory and experiment is also obtained for dopant profile spreading during pulsed-laser annealing.
Date:
November 1, 1980
Creator:
Wood, R. F.; Lowndes, D. H. & Christie, W. H.
Object Type:
Article
System:
The UNT Digital Library
Modern integral equation techniques for quantum reactive scattering theory
Rigorous calculations of cross sections and rate constants for elementary gas phase chemical reactions are performed for comparison with experiment, to ensure that our picture of the chemical reaction is complete. We focus on the H/D+H{sub 2} {yields} H{sub 2}/DH + H reaction, and use the time independent integral equation technique in quantum reactive scattering theory. We examine the sensitivity of H+H{sub 2} state resolved integral cross sections {sigma}{sub v{prime}j{prime},vj}(E) for the transitions (v = 0,j = 0) to (v{prime} = 1,j{prime} = 1,3), to the difference between the Liu-Siegbahn-Truhlar-Horowitz (LSTH) and double many body expansion (DMBE) ab initio potential energy surfaces (PES). This sensitivity analysis is performed to determine the origin of a large discrepancy between experimental cross sections with sharply peaked energy dependence and theoretical ones with smooth energy dependence. We find that the LSTH and DMBE PESs give virtually identical cross sections, which lends credence to the theoretical energy dependence.
Date:
November 1, 1993
Creator:
Auerbach, S. M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library