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Fingerprinting Communication and Computation on HPC Machines
How do we identify what is actually running on high-performance computing systems? Names of binaries, dynamic libraries loaded, or other elements in a submission to a batch queue can give clues, but binary names can be changed, and libraries provide limited insight and resolution on the code being run. In this paper, we present a method for"fingerprinting" code running on HPC machines using elements of communication and computation. We then discuss how that fingerprint can be used to determine if the code is consistent with certain other types of codes, what a user usually runs, or what the user requested an allocation to do. In some cases, our techniques enable us to fingerprint HPC codes using runtime MPI data with a high degree of accuracy.
Date:
June 2, 2010
Creator:
Peisert, Sean
Object Type:
Report
System:
The UNT Digital Library
Low-Dose Risk, Decisions, and Risk Communication
To conduct basic research on how people receive, evaluate, and form positions on scientific information and its relationship to low-dose radiation exposure. There are three major areas of study in our research program. First is the development of theories, frameworks and concepts essential to guiding data collection and analysis. The second area is a program of experimental studies on risk perception, evaluation of science information, and the structure of individual positions regarding low dose exposures. This involves the study of existing knowledge and the evaluation of science information presented within a variety of formats, as educational information, news media stories, and alternative communication methods (personal contact, small group interaction, email & internet, etc.). Third is the community-level studies to examine and record how the social conditions, under which science communications take place, influence the development of attitudes and opinions about: low- dose exposures, the available management options, control of radiation risks, and preferences for program and policy goals.
Date:
June 1, 2001
Creator:
Flynn, James & Slovic, Paul
Object Type:
Report
System:
The UNT Digital Library
EM threat analysis for wireless systems.
Modern digital radio systems are complex and must be carefully designed, especially when expected to operate in harsh propagation environments. The ability to accurately predict the effects of propagation on wireless radio performance could lead to more efficient radio designs as well as the ability to perform vulnerability analyses before and after system deployment. In this report, the authors--experts in electromagnetic (EM) modeling and wireless communication theory--describe the construction of a simulation environment that is capable of quantifying the effects of wireless propagation on the performance of digital communication.
Date:
June 2006
Creator:
Burkholder, R. J.; Mariano, Robert J.; Schniter, P. & Gupta, I. J.
Object Type:
Report
System:
The UNT Digital Library
Low Dose Risk, Decisions, & Risk Communication
The objective of this project is to conduct basic research on how people receive, evaluate, and form positions on scientific information and its relationship to low-dose radiation exposure. There are three major areas of study in our research program. First is the development of theories, frameworks and concepts essential to guiding data collection and analysis. The second area is a program of experimental studies on risk perception, evaluation of science information, and the structure of individual positions regarding low-dose exposures. Third is the community-level studies to examine and record how the social conditions, under which science communications take place, influence the development of attitudes and opinions about: low-dose exposures, the available management options, control of radiation risks, and preferences for program and policy goals.
Date:
June 1, 2002
Creator:
Flynn, James
Object Type:
Report
System:
The UNT Digital Library
Communication in red fox dyads: a computer simulation study
None
Date:
June 1, 1973
Creator:
Montgomery, G.G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Foundations of S-matrix theory. Appendix A. The pragmatic interpretation of quantum theory
None
Date:
June 10, 1974
Creator:
Stapp, Henry P.
Object Type:
Report
System:
The UNT Digital Library
Generalized perturbation theory using two-dimensional, discrete ordinates transport theory
Perturbation theory for changes in linear and bilinear functionals of the forward and adjoint fluxes in a critical reactor has been implemented using two-dimensional discrete ordinates transport theory. The computer program DOT IV was modified to calculate the generalized functions GAMMA and GAMMA*. Demonstration calculations were performed for changes in a reaction-rate ratio and a reactivity worth caused by system perturbations. The perturbation theory predictions agreed with direct calculations to within about 2%. A method has been developed for calculating higher lambda eigenvalues and eigenfunctions using techniques similar to those developed for generalized functions. Demonstration calculations have been performed to obtain these eigenfunctions.
Date:
June 1, 1980
Creator:
Childs, R. L.
Object Type:
Report
System:
The UNT Digital Library
Construction of relativistic quantum theory: a progress report
We construct the particulate states of quantum physics using a recursive computer program that incorporates non-determinism by means of locally arbitrary choices. Quantum numbers and coupling constants arise from the construction via the unique 4-level combinatorial hierarchy. The construction defines indivisible quantum events with the requisite supraluminal correlations, yet does not allow supraluminal communication. Measurement criteria incorporate c, h-bar and m/sub p/ or (not ''and'') G, connected to laboratory events via finite particle number scattering theory and the counter paradigm. The resulting theory is discrete throughout, contains no infinities, and, as far as we have developed it, is in agreement with quantum mechanical and cosmological fact.
Date:
June 1, 1986
Creator:
Noyes, H. Pierre
Object Type:
Article
System:
The UNT Digital Library
Axions in String Theory
In the context of string theory, axions appear to provide the most plausible solution of the strong CP problem. However, as has been known for a long time, in many string-based models, the axion coupling parameter Fa is several orders of magnitude higher than the standard cosmological bounds. We re-examine this problem in a variety of models, showing that Fa is close to the GUT scale or above in many models that have GUT-like phenomenology, as well as some that do not. On the other hand, in some models with Standard Model gauge fields supported on vanishing cycles, it is possible for Fa to be well below the GUT scale.
Date:
June 9, 2006
Creator:
Svrcek, Peter; /Stanford U., Phys. Dept. /SLAC; Witten, Edward & /Princeton, Inst. Advanced Study
Object Type:
Report
System:
The UNT Digital Library
A Theory of Public Knowledge
This article offers a theory of public knowledge for the purposes of defining more clearly its role in information systems and classification schemas.
Date:
May 23, 2019
Creator:
Miksa, Shawne D., 1969- & McLain, Chinami
Object Type:
Article
System:
The UNT Digital Library
Advances in the theory of box integrals
Box integrals - expectations <|{rvec r}|{sup s}> or <|{rvec r}-{rvec q}|{sup s}> over the unit n-cube (or n-box) - have over three decades been occasionally given closed forms for isolated n,s. By employing experimental mathematics together with a new, global analytic strategy, we prove that for n {le} 4 dimensions the box integrals are for any integer s hypergeometrically closed in a sense we clarify herein. For n = 5 dimensions, we show that a single unresolved integral we call K{sub 5} stands in the way of such hyperclosure proofs. We supply a compendium of exemplary closed forms that naturally arise algorithmically from this theory.
Date:
June 25, 2009
Creator:
Bailey, David H.; Borwein, J. M. & Crandall, R. E.
Object Type:
Report
System:
The UNT Digital Library
The Theory of Random Laser Systems
Studies of random laser systems are a new direction with promising potential applications and theoretical interest. The research is based on the theories of localization and laser physics. So far, the research shows that there are random lasing modes inside the systems which is quite different from the common laser systems. From the properties of the random lasing modes, they can understand the phenomena observed in the experiments, such as multi-peak and anisotropic spectrum, lasing mode number saturation, mode competition and dynamic processes, etc. To summarize, this dissertation has contributed the following in the study of random laser systems: (1) by comparing the Lamb theory with the Letokhov theory, the general formulas of the threshold length or gain of random laser systems were obtained; (2) they pointed out the vital weakness of previous time-independent methods in random laser research; (3) a new model which includes the FDTD method and the semi-classical laser theory. The solutions of this model provided an explanation of the experimental results of multi-peak and anisotropic emission spectra, predicted the saturation of lasing modes number and the length of localized lasing modes; (4) theoretical (Lamb theory) and numerical (FDTD and transfer-matrix calculation) studies of the origin of …
Date:
June 27, 2002
Creator:
Jiang, Xunya
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Microinstability theory in tokamaks: a review
Significant investigations in the area of tokamak microinstability theory are reviewed. Emphasis is given to the work covering the period from 1970 through 1976. Special attention is focused on low-frequency electrostatic drift-type modes, which are generally believed to be the dominant tokamak microinstabilities under normal operating conditions. The basic linear formalism including electromagnetic (finite beta) modifications is presented along with a general survey of the numerous papers investigating specific linear and nonlinear effects on these modes. Estimates of the associated anomalous transport and confinement times are discussed, and a summary of relevant experimental results is given. Studies of the nonelectrostatic and high-frequency instabilities associated with the presence of high energy ions from neutral beam injection (or with the presence of alpha particles from fusion reactions) are also surveyed.
Date:
June 1, 1977
Creator:
Tang, W. M.
Object Type:
Report
System:
The UNT Digital Library
Models and theory for precompound angular distributions
We compare angular distributions calculated by folding nucleon- nucleon scattering kernels, using the theory of Feshbach, Kerman and Koonin, and the systematics of Kalbach, with a wide range of data. The data range from (n,xn) at 14 MeV incident energy to (p,xn) at 160 MeV incident energy. The FKK theory works well with one adjustable parameter, the depth of the nucleon-nucleon interaction potential. The systematics work well when normalized to the hybrid model single differential cross section prediction. The nucleon- nucleon scattering approach seems inadequate. 9 refs., 10 figs.
Date:
June 6, 1990
Creator:
Blann, M.; Pohl, B. A.; Remington, B. A.; Scobel, W.; Trabandt, M.; Byrd, R. C. et al.
Object Type:
Article
System:
The UNT Digital Library
Variational theory of nuclear and neutron matter
In these lectures we will discuss attempts to solve the A = 3 to {infinity} nuclear many-body problems with the variational method. We choose the form of a variational wave function {Chi}{sub v}(1, 2{hor ellipsis}A) to describe the ground state. The {Chi}{sub v} and the ground-state energy E{sub v} are obtained by minimizing E{sub v} = {l angle}{Chi}{sub v}{vert bar}H{vert bar}{Chi}{sub v}{r angle}/{l angle}{Chi}{sub v}{vert bar}{Chi}{sub v}{r angle} with respect to variations in {Chi}{sub v}. If the form of the variational wave function is chosen properly we can expect {Chi}{sub v} {approx} {Chi}{sub 0} and E{sub v} {approx} E{sub 0} where {Chi}{sub 0} and E{sub 0} are the exact ground-state wave function and energy. In general E{sub v} {ge} E{sub 0} in variational calculations. 63 refs., 11 figs.
Date:
June 1, 1989
Creator:
Pandharipande, V.R.; Wiringa, R.B. (Illinois Univ., Urbana, IL (USA). Dept. of Physics & Argonne National Lab., IL (USA))
Object Type:
Article
System:
The UNT Digital Library
Nuclear theory summer meeting on ERHIC
The eRHIC BNL summer meeting was held at BNL from June 26 to July 14, 2000. The meeting was very informal with only two talks a day and with ample time for discussions and collaborations. Several of the theory talks focused on the issue of saturation of parton distributions at small x--whether screening effects have already been seen at HERA, the relation of saturation to shadowing, and on the various signatures of a proposed novel state of matter--the Colored Glass Condensate--that may be observed at eRHIC. A related topic that was addressed was that of quantifying twist four effects, and on the relevance of these for studies of energy loss. Other issues addressed were coherence effects in vector meson production, anti-quark distributions in nuclei, and the relevance of saturation for heavy ion collisions. There were, also, talks on the Pomeron--the relevance of instantons and the non-perturbative gluon condensate to constructing a Pomeron. On the spin physics side, there were talks on predictions for inclusive distributions at small x. There were also talks on Skewed Parton Distributions and Deeply Virtual Compton Scattering. Though most of the talks were theory talks, there were also several important experimental contributions. A preliminary detector design …
Date:
June 26, 2000
Creator:
McLerran, L. & Venugopalan, R.
Object Type:
Report
System:
The UNT Digital Library
Classical field theory with Z(3) symmetry
Solutions and some of their properties of a classical vector field model in two-dimensional Minkowski space with internal symmetry Z(3) - the cyclic group of order three are presented.
Date:
June 1, 1981
Creator:
Ruck, H.M.
Object Type:
Article
System:
The UNT Digital Library
Status of effective field theory of NN scattering
There exist many nucleon-nucleon potentials which reproduce phase shifts and nuclear properties with remarkable accuracy. Three fundamental features are shared by these potential models: (1) pions are important at long distances, (2) there is a source of intermediate-range attraction, and (3) there is a source of short-distance repulsion. However, in general, distinct physical mechanisms in these models account for the same feature of the nuclear force. Agreement with experiment is maintained in spite of these differences because of the large number of fit parameters. Systematic approaches to the scattering of strongly interacting particles, such as chiral perturbation theory, are based on the ideas of effective field theory (EFT). The author reviews recent progress in developing a systematic power counting scheme for scattering processes involving more than one nucleon.
Date:
June 1, 1998
Creator:
Beane, S.R.
Object Type:
Article
System:
The UNT Digital Library
Lie transforms and their use in Hamiltonian perturbation theory
A review is presented of the theory of Lie transforms as applied to Hamiltonian systems. We begin by presenting some general background on the Hamiltonian formalism and by introducing the operator notation for canonical transformations. We then derive the general theory of Lie transforms. We derive the formula for the new Hamiltonian when one uses a Lie transform to effect a canonical transformation, and we use Lie transforms to prove a very general version of Noether's theorem, or the symmetry-equals-invariant theorem. Next we use the general Lie transform theory to derive Deprit's perturbation theory. We illustrate this perturbation theory by application to two well-known problems in classical mechanics. Finally we present a chapter on conventions. There are many ways to develop Lie transforms. The last chapter explains the reasons for the choices made here.
Date:
June 1, 1978
Creator:
Cary, J.R.
Object Type:
Report
System:
The UNT Digital Library
Effect of Rate of Compression and Mode of Presentation on the Comprehension of a Recorded Communication to Junior College Students of Varying Aptitudes
The problem of this study was to assess the desirability and practicality of utilizing compressed speech as an instructional technique within a junior college setting.
Date:
June 1970
Creator:
Parker, Clement Cordell, 1940-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
THE THEORY AND IMPLEMENTATION OF SRT DIVISION. Report No. 230.
None
Date:
June 1, 1967
Creator:
Atkins, III, Daniel E
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Generalized Van Der Waals Theory of Pure Fluids and Mixtures
This report discusses functional group analysis and partition function analysis of pure fluids and mixtures using generalized van der waals theory. (LSP)
Date:
June 1990
Creator:
Sandler, Stanley I.
Object Type:
Report
System:
The UNT Digital Library
Fundamental theory of light for applications: Notes for five informal lectures
These notes give an overview of some aspects of the quantum theory of light and its interaction with matter. A description is given of basic emission and absorption processes, as well as the theory of photodetection and optical coherence. Basic research in this area is increasingly relevant to areas of technological importance, including microlaser devices and the noise characteristics of semiconductor lasers.
Date:
June 18, 1993
Creator:
Milonni, P.W.
Object Type:
Article
System:
The UNT Digital Library
Fundamental theory of light for applications: Notes for five informal lectures
These notes give an overview of some aspects of the quantum theory of light and its interaction with matter. A description is given of basic emission and absorption processes, as well as the theory of photodetection and optical coherence. Basic research in this area is increasingly relevant to areas of technological importance, including microlaser devices and the noise characteristics of semiconductor lasers.
Date:
June 18, 1993
Creator:
Milonni, P. W.
Object Type:
Article
System:
The UNT Digital Library