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19,713 Matching Results
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Improving risk communication through interactive training in communication skills
This paper describes a workshop in communication and public speaking skills recently conducted for a group of public officials whose responsibilities include presenting risk information at public meetings associated with hazardous waste sites. We detail the development and execution of the 2 1/2 day workshop, including the development and integration of a 45-minute video of a simulated public meeting used to illustrate examples of good and bad communication behaviors. The workshop uses a mock public meeting video, participatory video exercises, role-playing, and instructor, and a resource text. This interactive approach to teaching communication skills can help sensitize scientists to the public's understanding of risk and improve scientists' confidence and effectiveness in communicating scientific information. 10 refs., 1 fig.
Date:
January 1, 1990
Creator:
White, D. A. & White, R. K.
Object Type:
Article
System:
The UNT Digital Library
A doubly logarithmic communication algorithm for the Completely Connected Optical Communication Parallel Computer
In this paper we consider the problem of interprocessor communication on a Completely Connected Optical Communication Parallel Computer (OCPC). The particular problem we study is that of realizing an h-relation. In this problem, each processor has at most h messages to send and at most h messages to receive. It is clear that any 1-relation can be realized in one communication step on an OCPC. However, the best known p-processor OCPC algorithm for realizing an arbitrary h-relation for h > 1 requires {Theta}(h + log p) expected communication steps. (This algorithm is due to Valiant and is based on earlier work of Anderson and Miller.) Valiant`s algorithm is optimal only for h = {Omega}(log p) and it is an open question of Gereb-Graus and Tsantilas whether there is a faster algorithm for h = o(log p). In this paper we answer this question in the affirmative by presenting a {Theta} (h + log log p) communication step algorithm that realizes an arbitrary h-relation on a p-processor OCPC. We show that if h {le} log p then the failure probability can be made as small as p{sup -{alpha}} for any positive constant {alpha}.
Date:
January 20, 1993
Creator:
Goldberg, L. A.; Jerrum, M.; Leighton, T. & Rao, S.
Object Type:
Article
System:
The UNT Digital Library
Communication patterns and allocation strategies.
Motivated by observations about job runtimes on the CPlant system, we use a trace-driven microsimulator to begin characterizing the performance of different classes of allocation algorithms on jobs with different communication patterns in space-shared parallel systems with mesh topology. We show that relative performance varies considerably with communication pattern. The Paging strategy using the Hilbert space-filling curve and the Best Fit heuristic performed best across several communication patterns.
Date:
January 1, 2004
Creator:
Leung, Vitus Joseph; Mache, Jens Wolfgang & Bunde, David P.
Object Type:
Report
System:
The UNT Digital Library
Fiber optic communication links
Fiber optics is a new, emerging technology which offers relief from many of the problems which limited past communications links. Its inherent noise immunity and high bandwidth open the door for new designs with greater capabilities. Being a new technology, certain problems can be encountered in specifying and installing a fiber optic link. A general fiber optic system is discussed with emphasis on the advantages and disadvantages. It is not intended to be technical in nature, but a general discussion. Finally, a general purpose prototype Sandia communications link is presented.
Date:
January 1, 1980
Creator:
Meyer, R. H.
Object Type:
Article
System:
The UNT Digital Library
Position Estimation of Transceivers in Communication Networks
With rapid developments in wireless sensor networks, there is a growing need for transceiver position estimation independent of GPS, which may not be available in indoor networks. Our approach is to use range estimates from time-of-flight (TOF) measurements, a technique well suited to large bandwidth physical links, such as in ultra-wideband (UWB) systems. In our UWB systems, pulse duration less than 200 psecs can easily be resolved to less than a foot. Assuming an encoded UWB physical layer, we first test positioning accuracy using simulations. We are interested in sensitivity to range errors and the required number of ranging nodes, and we show that in a high-precision environment, such as UWB, the optimal number of transmitters is four. Four transmitters with {+-}20ft. range error can locate a receiver to within one or two feet. We then implement these algorithms on an 802.11 wireless network and demonstrate the ability to locate a network access point to approximately 20 feet.
Date:
January 20, 2004
Creator:
Dowla, F. & Kent, C.
Object Type:
Article
System:
The UNT Digital Library
Network Communication as a Service-Oriented Capability
In widely distributed systems generally, and in science-oriented Grids in particular, software, CPU time, storage, etc., are treated as"services" -- they can be allocated and used with service guarantees that allows them to be integrated into systems that perform complex tasks. Network communication is currently not a service -- it is provided, in general, as a"best effort" capability with no guarantees and only statistical predictability. In order for Grids (and most types of systems with widely distributed components) to be successful in performing the sustained, complex tasks of large-scale science -- e.g., the multi-disciplinary simulation of next generation climate modeling and management and analysis of the petabytes of data that will come from the next generation of scientific instrument (which is very soon for the LHC at CERN) -- networks must provide communication capability that is service-oriented: That is it must be configurable, schedulable, predictable, and reliable. In order to accomplish this, the research and education network community is undertaking a strategy that involves changes in network architecture to support multiple classes of service; development and deployment of service-oriented communication services, and; monitoring and reporting in a form that is directly useful to the application-oriented system so that it may …
Date:
January 8, 2008
Creator:
Johnston, William; Johnston, William; Metzger, Joe; Collins, Michael; Burrescia, Joseph; Dart, Eli et al.
Object Type:
Book
System:
The UNT Digital Library
SSC high speed communication channel and interconnects
This paper investigates potential metallic and optical technology applications in SSC high speed interconnects and/or communication channels. Primary focus will be placed on evaluating several metallic and optical interconnect structures. 7 refs., 3 figs.
Date:
January 1, 1990
Creator:
Cooke, B. J.; Smith, R. C. & Wagner, R.
Object Type:
Article
System:
The UNT Digital Library
Communication performance of the Intel Touchstone DELTA mesh
The communication performance of the i860-based Intel DELTA mesh supercomputer is compared with the Intel iPSC/860 hypercube and the Ncube 6400 hypercube. Single and multiple hop communication bandwidth and latencies are measured. Concurrent communication speeds and speed under network load are also measured. File I/O performance of the mesh-attached Concurrent File System is measured.
Date:
January 1, 1992
Creator:
Dunigan, T.H.
Object Type:
Report
System:
The UNT Digital Library
Communication performance of the Intel Touchstone DELTA mesh
The communication performance of the i860-based Intel DELTA mesh supercomputer is compared with the Intel iPSC/860 hypercube and the Ncube 6400 hypercube. Single and multiple hop communication bandwidth and latencies are measured. Concurrent communication speeds and speed under network load are also measured. File I/O performance of the mesh-attached Concurrent File System is measured.
Date:
January 1, 1992
Creator:
Dunigan, T. H.
Object Type:
Report
System:
The UNT Digital Library
Bandwidth utilization maximization of scientific RF communication systems
A method for more efficiently utilizing the frequency bandwidth allocated for data transmission is presented. Current space and range communication systems use modulation and coding schemes that transmit 0.5 to 1.0 bits per second per Hertz of radio frequency bandwidth. The goal in this LDRD project is to increase the bandwidth utilization by employing advanced digital communications techniques. This is done with little or no increase in the transmit power which is usually very limited on airborne systems. Teaming with New Mexico State University, an implementation of trellis coded modulation (TCM), a coding and modulation scheme pioneered by Ungerboeck, was developed for this application and simulated on a computer. TCM provides a means for reliably transmitting data while simultaneously increasing bandwidth efficiency. The penalty is increased receiver complexity. In particular, the trellis decoder requires high-speed, application-specific digital signal processing (DSP) chips. A system solution based on the QualComm Viterbi decoder and the Graychip DSP receiver chips is presented.
Date:
January 1, 1997
Creator:
Rey, D.; Ryan, W. & Ross, M.
Object Type:
Report
System:
The UNT Digital Library
Phase patterns of coupled oscillators with application to wireless communication
Here we study the plausibility of a phase oscillators dynamical model for TDMA in wireless communication networks. We show that emerging patterns of phase locking states between oscillators can eventually oscillate in a round-robin schedule, in a similar way to models of pulse coupled oscillators designed to this end. The results open the door for new communication protocols in a continuous interacting networks of wireless communication devices.
Date:
January 2, 2008
Creator:
Arenas, A.
Object Type:
Article
System:
The UNT Digital Library
Proton decay theory
Topics include minimal SU(5) predictions, gauge boson mediated proton decay, uncertainties in tau/sub p/, Higgs scalar effects, proton decay via Higgs scalars, supersymmetric SU(5), dimension 5 operators and proton decay, and Higgs scalars and proton decay. (WHK)
Date:
January 1, 1983
Creator:
Marciano, William J.
Object Type:
Article
System:
The UNT Digital Library
Theory of bulk gettering
A general theory describing bulk getter operation is presented. The theory includes the effects of getter surface reactions and getter bulk diffusion. Exact numerical solutions are presented for the particular cases of pumping and desorption. In addition, approximate analytical solutions are derived and used to illustrate the characteristics of the particular operational regimes. The theory is applied to the analysis of the pumping and desorption behavior of the Zr-Al alloy bulk getter. The predictions of the theory are in excellent agreement with the experimentally measured Zr-Al performance.
Date:
January 1, 1983
Creator:
Knize, R. J. & Cecchi, J. L.
Object Type:
Report
System:
The UNT Digital Library
Developments in sensitivity theory
A review of recent developments in sensitivity theory is presented with an emphasis on (a) extensions to new areas such as thermal hydraulics, reactor depletion, multi-constraint and extrema problems, and (b) recent mathematical refinements to and extensions of the basic theory. The diverse new areas of application are discussed from a unified theoretical viewpoint based on nonlinear functional analysis. Several new applications of sensitivity theory are presented for problems in constrained reactor physics calculations, irradiation experiment analysis, reactor burnup calculations, and transient thermal-hydraulic analysis. Future directions of the research are suggested.
Date:
January 1, 1980
Creator:
Cacuci, D. G.; Greenspan, E.; Marable, J. H. & Williams, M. L.
Object Type:
Article
System:
The UNT Digital Library
Resonance spectroscopy (theory)
None
Date:
January 1, 1974
Creator:
Rosner, J.L.
Object Type:
Report
System:
The UNT Digital Library
Emerson's Theory of Learning
The purpose of this thesis is two-fold: it is (1) to show Emerson's development of a consistent and fully formed theory of education which may well have value for the present time, and (2) to analyze the main aspects of this theory in detail for a better understanding of Emerson's thought.
Date:
January 1962
Creator:
Gause, Mary Jean
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Nuclear Reactor Theory
None
Date:
January 1, 1970
Creator:
Bell, G. I. & Glasstone, S.
Object Type:
Book
System:
The UNT Digital Library
The Substrate-Independence Theory: Advancing Constructor Theory to Scaffold Substrate Attributes for the Recursive Interaction between Knowledge and Information
Article exploring how information and knowledge are absorbed by utilizing Constructor Theory and the Substrate-Independence Theory.
Date:
November 30, 2021
Creator:
Turner, John R.; Snowden, Dave & Thurlow, Nigel
Object Type:
Article
System:
The UNT Digital Library
Panel report on theory of surfaces
A report on the surface science workshop is given. Problem areas focussing on atoms, electrons, and alloys are described and the role of theory is discussed. (FS)
Date:
January 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Resistive theory of bunch lengthening
A new theory of bunch lengthening in electron storage rings is proposed. The equilibrium bunch length is that length which stabilizes the bunch against the onset of ''fast'' resistive instability, caused by the combination of many high frequency resonators such as vacuum flanges. The heat dissipated in these impedance sources follows immediately from the bunch length. It is found that the anomalous bunch length is determined by a scaling parameter g = (hVcos phi/sub s/)/I. Data taken in SPEAR I and II, data in which g extends in value by more than three orders of magnitude, can be fit with an appropriate choice of high frequency, large width coupling impedance. The impedance functions for SPEAR I and II are taken to be the same, a reflection of the fact that the high frequency sources are chamber discontinuities rather than structures connected with the rf systems. A parameter search leads to an impedance characterized by a central frequency approximately 5 GHz, a width (FWHM) approximately 1.8 GHz and a peak impedance approximately 0.2 M OMEGA. The expected and observed higher mode resistance (i.e., heat dissipated) for SPEAR are compared and found to be in agreement. Predictions are given for PEP and …
Date:
January 1, 1977
Creator:
Month, M. & Messerschmid, E.
Object Type:
Article
System:
The UNT Digital Library
Muon-catalyzed fusion theory
Some topics in muon-catalyzed fusion theory are discussed: Resonant formation of dd{mu} molecules appears to be well understood, with good agreement so far between theory and experiment. The situation for resonant dt{mu} formation is much less clear, because of the more complicated kinetics, the apparent three-body effect, and the evident need to treat thermalization and molecular formation together to compare theory and experiment. Recent theoretical progress in pd{mu} fusion by Friar et al. has resolved a serious discrepancy in the Wolfenstein-Gershtein effect, i.e., the increase in pd{mu} fusion yield with increased deuterium fraction. 44 refs., 8 figs., 2 tabs.
Date:
January 1, 1991
Creator:
Leon, M.
Object Type:
Article
System:
The UNT Digital Library
Report of the PSSC Theory Group
The physics motivation for the SSC is reviewed. The physics assumptions used in the ISAJET Monte Carlo program for pp and p anti p interactions are summarized. Some general properties of events at SSC energies are described. 36 references.
Date:
January 1, 1984
Creator:
Paige, Frank E.
Object Type:
Article
System:
The UNT Digital Library
(Nuclear theory: Annual report)
This report discusses topics on : nuclear structure models; algebraic models of hadronic structure; nuclear reactions; hot rotating nuclei; chaos in nuclei; signatures of the quark-gluon plasma; hadronic spectroscopy; octupole collectivity in nuclei; finite-temperature methods for the many-body problem; and classical limit of algebraic hamiltonians. (LSP)
Date:
January 1, 1991
Creator:
Iachello, F.; Alhassid, Y. & Kusnezov, D.
Object Type:
Report
System:
The UNT Digital Library
Compact torus experiments and theory
Two types of compact toroids have been studied: spheromaks and field-reversed configurations (FRC). Spheromaks, which contain both toroidal and poloidal fields, have been formed with a magnetized coaxial injector and trapped in both prolate and oblate flux conservers. As expected from theory, the prolate configuration always tilts, but the oblate configuration can be made stable even in the presence of a guide field. Observations include 150..mu..s lifetimes, <n> approx. 10/sup 14/ cm/sup -3/, and a decrease of field fluctuations by a factor of 100 at the time of complete reconnection. Theoretical studies of the FRC (no toroidal field) have been compared with the results of two field-reversed theta-pinches, FRX-A and FRX-B.
Date:
January 1, 1980
Creator:
Armstrong, W. T.; Barnes, D. C. & Bartsch, R. R.
Object Type:
Article
System:
The UNT Digital Library