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Communication on the Paragon
In this note the authors describe the results of some tests of the message-passing performance of the Intel Paragon. These tests have been carried out under both the Intel-supplied OSF/1 operating system with an NX library, and also under an operating system called SUNMOS (Sandia UNM Operating System). For comparison with the previous generation of Intel machines, they have also included the results on the Intel Touchstone Delta. The source code used for these tests is identical for all systems. As a result of these tests, the authors can conclude that SUNMOS demonstrates that the Intel Paragon hardware is capable of very high bandwidth communication, and that the message coprocessor on Paragon nodes can be used to give quite respectable latencies. Further tuning can be expected to yield even better performance.
Date:
October 15, 1993
Creator:
Greenberg, D.; Maccabe, B.; McCurley, K. S.; Riesen, R. & Wheat, S.
Object Type:
Report
System:
The UNT Digital Library
Position Estimation of Tranceivers in Communication Networks
With the rapid development in wireless sensor networks, there is an important need for transceiver position estimation independent of Global Positioning Systems (GPS) [1,3]. While GPS might be useful for outdoor sensor nodes, it is not for indoor node localization. In this case, position estimation is possible through network range estimates from time-of-flight (TOF) measurements, a technique well suited to large bandwidth physical links, such as in ultra-wideband (UWB) communications. For example, in our UWB systems, with pulse duration less than 200 pico-seconds, range can easily be resolved to less than a foot. Assuming an encoded UWB or spread spectrum physical layer, we developed algorithms and simulation tools to test transceiver position localization. Simulations were designed to lend insight into system characteristics such as position error sensitivities to network geometry, to range estimation errors, and to number of sensor nodes.
Date:
October 13, 2003
Creator:
Kent, C. A. & Dowla, F. U.
Object Type:
Report
System:
The UNT Digital Library
Understanding communication in counterterrorism crisis management.
This report describes the purpose and results of the two-year, Sandia-sponsored Laboratory Directed Research and Development (LDRD) project entitled Understanding Communication in Counterterrorism Crisis Management The purpose of this project was to facilitate the capture of key communications among team members in simulated training exercises, and to learn how to improve communication in that domain. The first section of this document details the scenario development aspects of the simulation. The second section covers the new communication technologies that were developed and incorporated into the Weapons of Mass Destruction Decision Analysis Center (WMD-DAC) suite of decision support tools. The third section provides an overview of the features of the simulation and highlights its communication aspects. The fourth section describes the Team Communication Study processes and methodologies. The fifth section discusses future directions and areas in which to apply the new technologies and study results obtained as a result of this LDRD.
Date:
October 1, 2004
Creator:
Djordjevich, Donna D.; Barr, Pamela K.; Arnold, Jason Darrel; Johnson, Michael M.; Sa, Timothy J.; Hawley, Marilyn F. et al.
Object Type:
Report
System:
The UNT Digital Library
Digital Communication Analytics Academic Program Review
This report summarizes an evaluation of the UNT Libraries' Digital Communication Analytics-related resources and materials to determine if the collection is adequately serving patron needs. It was generated as part of the UNT Libraries’ contributions to the university’s Academic Program Reviews, which are conducted by the Accreditation office in the Division of Planning. The UNT Libraries’ Collection Assessment Department evaluated collections’ ability to meet the curricular and research needs of the academic programs being reviewed. They assessed current needs based on course descriptions and research outputs, defined the scope of information needed based on this needs assessment, and evaluated the Libraries’ holdings in these subject areas against the usage, qualitative listings, and requests for materials from other libraries. Specific recommendations for collection development are provided based on the results of these analyses.
Date:
October 14, 2022
Creator:
Harker, Karen
Object Type:
Report
System:
The UNT Digital Library
Dynamic Statistical Profiling of Communication Activity in Distributed Applications
A complete trace of communication activity for a terascale application is overwhelming in terms of overhead and storage. We propose a novel alternative that enables profiling of the application's communication activity using statistical message sampling during runtime. We have implemented an operational prototype and our evidence shows that this new technique can provide an accurate, low-overhead, tractable alternative for performance analysis of communication activity. Moreover, this alternative enables an assortment of runtime analysis techniques not previously available with post-mortem, trace-based systems. Our assessment of relative performance and coverage of different sampling and analysis methods shows that purely random selection is preferred over counter- and timer-based sampling. Experiments on several applications running up to 128 processors demonstrate the viability of this approach. In particular, on one application, statistical profiling results contradict conclusions based on evidence from tracing. The design of our prototype reveals that parsimonious modifications to the MPI runtime system could facilitate such techniques on production computing systems, and it suggests that this sampling technique could execute continuously for long-running applications.
Date:
October 12, 2001
Creator:
Vetter, Jeffrey
Object Type:
Article
System:
The UNT Digital Library
Understanding Yik Yak: Location-Based Sociability and the Communication of Place
This article reports on six months of ethnographic work and interviews performed with 18 Yik Yak users to discuss the spatial and social impacts of locative media.
Date:
October 1, 2017
Creator:
Frith, Jordan & Saker, Michael
Object Type:
Article
System:
The UNT Digital Library
Theory of contributon transport
A general discussion of the physics of contributon transport is presented. To facilitate this discussion, a Boltzmann-like transport equation for contributons is obtained, and special contributon cross sections are defined. However, the main goal of this study is to identify contributon transport equations and investigate possible deterministic solution techniques. Four approaches to the deterministic solution of the contributon transport problem are investigated. These approaches are an attempt to exploit certain attractive properties of the contributon flux, psi = phi phi/sup +/, where phi and phi/sup +/ are the solutions to the forward and adjoint Boltzmann transport equations.
Date:
October 1, 1980
Creator:
Painter, J. W.; Gerstl, S. A. W. & Pomraning, G. C.
Object Type:
Report
System:
The UNT Digital Library
Communication of Energy Efficiency Information to Remodelers: Lessons From Current Practice
The effective communication of energy efficiency and building science information to remodeling contractors is achieved through varying formats, timelines, and modes depending on who is delivering the information, who is intended to receive it, and what technical, intellectual,and time resources the recipients have at their disposal. Determining what type of communication is effective does not lend itself to a clearly quantifiable test but rather a qualitative one. That qualitative judgment can be supported by the research of current practices deemed effective for one or more of the following reasons: it has led to the successful completion of a certifying test or other evaluation, it has been widely used for the remodeling industry, it has been considered effective by a sampling of remodeling contractors, and/or it has proven effective in the field for the BARA team. These criteria were used to create a select list of communications to be further analyzed to determine why they are effective and how less successful formats or strategies can be revised for greater effectiveness.
Date:
October 1, 2012
Creator:
Liaukus, C.
Object Type:
Report
System:
The UNT Digital Library
Disruption of satellite-to-ground station communication links by nuclear fireballs
Diffraction around nuclear fireballs near the line of sight for satellite-to-ground communication links is calculated numerically. The geometry allows assumption of geometric optics and plane-wave signals. The fireball is modeled as an opaque disk normal to the line of sight. The effect of disk shape and edge taper is considered. 13 figures, 1 table.
Date:
October 1, 1977
Creator:
Sullivan, T.D.
Object Type:
Report
System:
The UNT Digital Library
Use of communication architecture test bed to evaluate data network performance
Local area networks (LANs) are becoming more prevalent in nuclear power plants. Traditionally, LANs were only used as information highways, providing office automation services. LANs are now being used as data highways for applications in plant data acquisition and control systems. A communication architecture test bed, which contains network simulators, is needed to allow network performance studies and to resolve design issues prior to equipment purchase. Two levels of granularity of simulation are needed to provide the dynamic information about network performance. A coarse-grain simulator is used to estimate the dynamic performance of the network due to major resources such as workstations, gateways, and data acquisition systems. A fine-grain simulator allows a greater level of detail about the underlying network protocol and resources to be simulated. The combination of coarse-grain and fine-grain simulation packages provides the network designer with the required tools to thoroughly understand the behavior of the modeled network. This paper describes the development of a communication architecture test bed using commercial network simulation packages. Network simulators allow the resolution of major design issues in software without the expense of purchasing costly hardware components.
Date:
October 1, 1994
Creator:
Clapp, N. E., Jr.; Swail, B. K. & Naser, J. A.
Object Type:
Article
System:
The UNT Digital Library
Theory of Electron-Ion Collisions
Collisions of electrons with atoms and ions play a crucial role in the modeling and diagnostics of fusion plasmas. In the edge and divertor regions of magnetically confined plasmas, data for the collisions of electrons with neutral atoms and low charge-state ions are of particular importance, while in the inner region, data on highly ionized species are needed. Since experimental measurements for these collisional processes remain very limited, data for such processes depend primarily on the results of theoretical calculations. Over the period of the present grant (January 2006 â August 2009), we have made additional improvements in our parallel scattering programs, generated data of direct fusion interest and made these data available on The Controlled Fusion Atomic Data Center Web site at Oak Ridge National Laboratory. In addition, we have employed these data to do collsional-radiative modeling studies in support of a variety of experiments with magnetically confined fusion plasmas.
Date:
October 2, 2009
Creator:
Griffin, Donald C.
Object Type:
Report
System:
The UNT Digital Library
REACTOR COMPUTATION METHODS AND THEORY.
None
Date:
October 31, 1971
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Theory of the Dielectric Wakefield Accelerator
The general theory for all angular modes m of the dielectric wakefield accelerator is reformulated. The expressions for the accelerating electric fields and transverse wake forces are written in terms of matrices, the zeros of one of which determine the excitation frequencies of the dielectric structure. In this scheme it is possible to obtain a maximum accelerating gradient of 2.0 megavolts per meter per nanoCoulomb of driver beam charge, for a driver beam of 0.7 millimeters rms bunch length. 29 refs., 5 figs.
Date:
October 1, 1990
Creator:
Mtingwa, S. K.
Object Type:
Article
System:
The UNT Digital Library
Theory of neutrinos: A White paper
During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the near and far future. Several working groups looked at various aspects of this vast field. The summary was published as a main report entitled ''The Neutrino Matrix'' accompanied by short 50 page versions of the report of each working group. Theoretical research in this field has been quite extensive and touches many areas and the short 50 page report [1] provided only a brief summary and overview of few of the important points. The theory discussion group felt that it may be of value to the community to publish the entire study as a white paper and the result is the current article. After a brief overview of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, the white paper summarizes what can be learned about physics beyond the Standard Model from the various proposed neutrino experiments. It also comments on the impact of the experiments on our understanding of the origin of the matter-antimatter …
Date:
October 1, 2005
Creator:
Mohapatra, R. N.; Antusch, S.; Babu, K. S.; Barenboim, G.; Chen, Mu-Chun; Davidson, S. et al.
Object Type:
Report
System:
The UNT Digital Library
An efficient communication scheme for solving the S{sub n} equations on message-passing multiprocessors
Early models of Intel`s hypercube multiprocessors, e.g. the IPSC/I and iPSC/2, were characterized by the high latency of message-passing. This relatively weak dependence of the communication penalty on the size of messages, in contrast to its strong dependence on the number of messages, justified using the Fan-in Fan-out algorithm to perform global operations, such as global sums, etc. Recent models of message passing computers, such as the iPSC/860 and the Paragon, have been found to possess much smaller latency, thus forcing a re-examination of the issue of performance optimization with respect to communication schemes. Essentially, the Fan-in Fan-out scheme minimizes the number of nonsimultaneous messages sent but not the volume of data traffic across the network. Furthermore, if a global operation is performed in conjunction with the message-passing, a large fraction of the attached nodes remains idle as the number of utilized processors is halved in each step of the process. On the other hand, the Recursive Halving scheme offers the smallest communication cost for global operations, but has some drawbacks. First, it requires the simultaneous exchange of messages between adjacent nodes, which while permissible on many message-passing computers, requires additional programing on the iPSC/860, the target platform in this …
Date:
October 1, 1993
Creator:
Azmy, Y. Y.
Object Type:
Article
System:
The UNT Digital Library
Comparison of weak interaction theory with experiment
The review discusses the status of charged currents, neutral current reactions, Glashow-Iliopoulos-Maiani model, extension to 6 quarks, and CP violation. 115 references. (GHT)
Date:
October 1, 1981
Creator:
Wojcicki, S.G.
Object Type:
Article
System:
The UNT Digital Library
Pathways, Networks, and Systems: Theory and Experiments
The international conference provided a unique opportunity for theoreticians and experimenters to exchange ideas, strategies, problems, challenges, language and opportunities in both formal and informal settings. This dialog is an important step towards developing a deep and effective integration of theory and experiments in studies of systems biology in humans and model organisms.
Date:
October 30, 2004
Creator:
Nadeau, Joseph H. & Lambris, John D.
Object Type:
Article
System:
The UNT Digital Library
Theory of radiation induced defect production
The theory of defect production in solids by neutron irradiation is reviewed, including discussions of the nuclear reactions which produce the primary recoils and the loss of energy from the displacement cascade by electron excitations. The theoretical predictions are compared with the limited available experiments on thermal and fast neutron irradiation. The results are in rough agreement in most instances, but further improvements in the theory are clearly needed. (auth)
Date:
October 1, 1975
Creator:
Robinson, M.T.
Object Type:
Article
System:
The UNT Digital Library
Fusion Plasma Theory project summaries
This Project Summary book is a published compilation consisting of short descriptions of each project supported by the Fusion Plasma Theory and Computing Group of the Advanced Physics and Technology Division of the Department of Energy, Office of Fusion Energy. The summaries contained in this volume were written by the individual contractors with minimal editing by the Office of Fusion Energy. Previous summaries were published in February of 1982 and December of 1987. The Plasma Theory program is responsible for the development of concepts and models that describe and predict the behavior of a magnetically confined plasma. Emphasis is given to the modelling and understanding of the processes controlling transport of energy and particles in a toroidal plasma and supporting the design of the International Thermonuclear Experimental Reactor (ITER). A tokamak transport initiative was begun in 1989 to improve understanding of how energy and particles are lost from the plasma by mechanisms that transport them across field lines. The Plasma Theory program has actively-participated in this initiative. Recently, increased attention has been given to issues of importance to the proposed Tokamak Physics Experiment (TPX). Particular attention has been paid to containment and thermalization of fast alpha particles produced in a …
Date:
October 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Theory of High Frequency Rectification by Silicon Crystals
The excellent performance of British ''red dot'' crystals is explained as due to the knife edge contact against a polished surface. High frequency rectification depends critically on the capacity of the rectifying boundary layer of the crystal. C. For high conversion efficiency, the product of this capacity and of the ''forward'' (bulk) resistance R{sub b} of the crystal must be small. For a knife edge, this product depends primarily on the breadth of the knife edge and very little upon its length. The contact can therefore have a rather large area which prevents burn-out. For a wavelength of 10 cm. the computations show that the breadth of the knife edge should be less than about 10{sup -3} cm. For a point contact the radius must be less than 1.5 x 10{sup -3} cm. and the resulting small area is conductive to burn-out. The effect of ''tapping'' is probably to reduce the area of contact.
Date:
October 29, 1942
Creator:
Bethe, H. A.
Object Type:
Report
System:
The UNT Digital Library
UST-ID robotics: Wireless communication and minimum conductor technology, and end-point tracking technology surveys
This report is a technology review of the current state-of-the-art in two technologies applicable to the Underground Storage Tank (UST) program at the Hanford Nuclear Reservation. The first review is of wireless and minimal conductor technologies for in-tank communications. The second review is of advanced concepts for independent tool-point tracking. This study addresses the need to provide wireless transmission media or minimum conductor technology for in-tank communications and robot control. At present, signals are conducted via contacting transmission media, i.e., cables. Replacing wires with radio frequencies or invisible light are commonplace in the communication industry. This technology will be evaluated for its applicability to the needs of robotics. Some of these options are radio signals, leaky coax, infrared, microwave, and optical fiber systems. Although optical fiber systems are contacting transmission media, they will be considered because of their ability to reduce the number of conductors. In this report we will identify, evaluate, and recommend the requirements for wireless and minimum conductor technology to replace the present cable system. The second section is a technology survey of concepts for independent end-point tracking (tracking the position of robot end effectors). The position of the end effector in current industrial robots is determined …
Date:
October 1, 1993
Creator:
Holliday, M. A.
Object Type:
Report
System:
The UNT Digital Library
Comparison of theory and simulations with recent laser plasma experiments
In the past few months, detailed experimental data have become available on laser light absorption versus angle, plasma density profiles near the critical surface, and stimulated scattering processes. In the light of these experiments, it seems timely to reassess our theoretical understanding of these phenomena. A quantitative comparison of the data with current results of plasma simulations and theory is presented and the areas where further theoretical effort is called for are pointed out. Three recent experiments done at Livermore are compared with the latest theoretical and simulation results on laser-plasma interactions. The analysis covers the following areas: (1) theory of resonance absorption on a rippled critical surface, compared with an experiment on the angle and polarization dependence of absorption; (2) theory of density profile steepening, compared with holographic interferometry measurements; and (3) theory of stimulated Brillouin scattering in long density gradients, compared with reflectivity measurements for long pulse, large focal spot experiments.
Date:
October 17, 1977
Creator:
Max, C.E.
Object Type:
Article
System:
The UNT Digital Library
Condensation of Metal Vapors: Mercury and the Kinetic Theory of Condensation
None
Date:
October 1, 1964
Creator:
Wilhelm, D. J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Task A: Theory of elementary particles. Annual report
Brief summaries of work are given in the following areas: grandunification, properties of neutrinos, rare decays of heavy quarks, jet production in hadron collisions (theory, structure, two-jet cross section, null-plane field theory), neutrino physics, and QCD calculations of annihilation of e{sup +}e{sup {minus}} into hadrons.
Date:
October 16, 1992
Creator:
Deshpande, N. G. & Soper, D. E.
Object Type:
Report
System:
The UNT Digital Library