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ATCOM: Automatically Tuned Collective Communication System for SMP Clusters
Conventional implementations of collective communications are based on point-to-point communications, and their optimizations have been focused on efficiency of those communication algorithms. However, point-to-point communications are not the optimal choice for modern computing clusters of SMPs due to their two-level communication structure. In recent years, a few research efforts have investigated efficient collective communications for SMP clusters. This dissertation is focused on platform-independent algorithms and implementations in this area. There are two main approaches to implementing efficient collective communications for clusters of SMPs: using shared memory operations for intra-node communications, and overlapping inter-node/intra-node communications. The former fully utilizes the hardware based shared memory of an SMP, and the latter takes advantage of the inherent hierarchy of the communications within a cluster of SMPs. Previous studies focused on clusters of SMP from certain vendors. However, the previously proposed methods are not portable to other systems. Because the performance optimization issue is very complicated and the developing process is very time consuming, it is highly desired to have self-tuning, platform-independent implementations. As proven in this dissertation, such an implementation can significantly out-perform the other point-to-point based portable implementations and some platform-specific implementations. The dissertation describes in detail the architecture of the platform-independent …
Date:
December 17, 2005
Creator:
Wu, Meng-Shiou
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
FCC Management: Improvements Needed in Communication, Decision-Making Processes, and Workforce Planning
A letter report issued by the Government Accountability Office with an abstract that begins "Rapid changes in the telecommunications industry, such as the development of broadband technologies, present new regulatory challenges for the Federal Communications Commission (FCC). Government Accountability Office (GAO) was asked to determine (1) the extent to which FCC's bureau structure presents challenges for the agency in adapting to an evolving marketplace; (2) the extent to which FCC's decision-making processes present challenges for FCC, and what opportunities, if any, exist for improvement; and (3) the extent to which FCC's personnel management and workforce planning efforts face challenges in ensuring that FCC has the workforce needed to achieve its mission. GAO reviewed FCC documents and data and conducted literature searches to identify proposed reforms, criteria, and internal control standards and compared them with FCC's practices. GAO also interviewed current and former FCC chairmen and commissioners, industry stakeholders, academic experts, and consumer representatives."
Date:
December 17, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Nonrelativistic theory of heavy-ion collisions
A wide range of phenomena is observed in heavy-ion collisions, calling for a comprehensive theory based on fundamental principles of many-particle quantum mechanics. At low energies, the nuclear dynamics is controlled by the mean field, as we know from spectroscopic nuclear physics. We therefore expect the comprehensive theory of collisions to contain mean-field theory at low energies. The mean-field theory is the subject of the first lectures in this chapter. This theory can be studied quantum mechanically, in which form it is called TDHF (time-dependent Hartree-Fock), or classically, where the equation is called the Vlasov equation. 25 references, 14 figures.
Date:
July 17, 1984
Creator:
Bertsch, G.
Object Type:
Article
System:
The UNT Digital Library
National Park Foundation: Better Communication of Roles and Responsibilities Is Needed to Strengthen Partnership with the National Park Service
A letter report issued by the General Accounting Office with an abstract that begins "In 1967, the Congress created the National Park Foundation (Foundation)--a nonprofit organization with the sole purpose of providing private support to the National Park Service (Park Service). However, some Park Service officials have raised concerns that the Foundation's support is not meeting parks' priority needs. In this context, congressional requesters asked GAO to review the activities of the Foundation by determining the (1) Foundation's roles and responsibilities for raising funds to support the Park Service, (2) amount and kinds of donations the Foundation has raised between fiscal years 1999 and 2003, and (3) extent to which the contributions obtained by the Foundation assisted the Park Service in addressing park priorities."
Date:
May 17, 2004
Creator:
United States. General Accounting Office.
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
Time dependent Hartree-Fock theory: special applications
Some TDHF applications are addressed that are somewhat subtler than just crashing nuclei together and looking at large chunks of nuclear material. I will also attempt to address some of the technical problems of doing TDHF and also point out some areas where work remains to be done. Topics include promptly emitted particles, large amplitude RPA, and exciting giant resonances in heavy ion collisions. 19 references. (WHK)
Date:
May 17, 1984
Creator:
Weiss, M.S.
Object Type:
Article
System:
The UNT Digital Library
Basic and heavy ion scattering in time dependent Hartree-Fock Theory
Time Dependent Hartree-Fock theory, TDHF, is the most sophisticated, microscopic approach to nuclear dynamics yet practiced. Although it is far from a description of nature it does allow us to examine multiply interactive many-body systems semi quantum mechanically and to visualize otherwise covert processes. Some of the properties of the TDHF equations are stated leaving the interested reader to one of several excellent review articles for the derivations. Some of the applications to the collision of heavy ions are briefly described. (WHK)
Date:
May 17, 1984
Creator:
Weiss, M.S.
Object Type:
Article
System:
The UNT Digital Library
Multi-Objective Response to Co-Resident Attacks in Cloud Environment
This article introduces a novel multi-objective attack response system.
Date:
September 17, 2017
Creator:
Abazari, Farzaneh; Analoui, Morteza & Takabi, Hassan
Object Type:
Article
System:
The UNT Digital Library
The Proton-Proton Triple Scattering Parameters R and A at 213 Mev
"As a part of a program to determine the p-p scattering matrix at 213 Mev, the triple scattering parameters R and A were measured at 30, 40, 50, 60, 70, 80. and 90 deg in the center-of-msss system. The results are compared with a phase shift analysis by MacGregor and Moravcsik and with the predictions of the boundary condition model of Saylor, Bryan and Marshak."
Date:
April 17, 1961
Creator:
England, Alan C.; Givson, William A. & Gotow, Kazuo
Object Type:
Report
System:
The UNT Digital Library
QCDOC: A 10-teraflops scale computer for lattice QCD
None
Date:
August 17, 2000
Creator:
Chen, D.; Christ, N. H.; Cristian, C.; Dong, Z.; Gara, A.; Garg, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Domain wall fermion calculation of nucleon G{sub A}/G{sub V}
The authors present a preliminary domain-wall fermion lattice-QCD calculation of isovector vector and axial charges, g{sub V} and g{sub A}, of the nucleon. Since the lattice renormalizations, Z{sub V} and Z{sub A}, of the currents are identical with DWF, the lattice ratio (g{sub A}/g{sub V}){sup lattice} directly yields the continuum value. Indeed Z{sub V} determined from the matrix element of the vector current agrees closely with Z{sub A} from a non-perturbative renormalization study of quark bilinears. They also obtain spin related quantities {Delta}q/g{sub V} and {delta}q/g{sub V}.
Date:
August 17, 2000
Creator:
Blum, T.; Ohta, S. & Sasaki, S.
Object Type:
Article
System:
The UNT Digital Library
An investigation into the accuracy, stability and parallel performance of a highly stable explicit technique for stiff reaction-transport PDEs
The numerical simulation of chemically reacting flows is a topic, that has attracted a great deal of current research At the heart of numerical reactive flow simulations are large sets of coupled, nonlinear Partial Differential Equations (PDES). Due to the stiffness that is usually present, explicit time differencing schemes are not used despite their inherent simplicity and efficiency on parallel and vector machines, since these schemes require prohibitively small numerical stepsizes. Implicit time differencing schemes, although possessing good stability characteristics, introduce a great deal of computational overhead necessary to solve the simultaneous algebraic system at each timestep. This thesis examines an algorithm based on a preconditioned time differencing scheme. The algorithm is explicit and permits a large stable time step. An investigation of the algorithm`s accuracy, stability and performance on a parallel architecture is presented
Date:
February 17, 1998
Creator:
Franz, A., LLNL
Object Type:
Report
System:
The UNT Digital Library
Observation of new levels for isotope separation in atomic uranium by multistep ionization
Over 100 new odd parity levels useful for isotope separation of U(I) were observed between 32,660--34,165 cm/sup -1/ using multistep photoionization. A tabulation of typical cross sections and radiative lifetimes for these states is given. The extension of this technique to mapping the spectra of other heavy atoms is discussed. (auth)
Date:
November 17, 1975
Creator:
Carlson, L. R.; Solarz, R. W.; Paisne, J. A.; Worden, E. F.; May, C. A. & Johnson, S. A.
Object Type:
Article
System:
The UNT Digital Library
Monopole strength as a probe of nuclear shape mixing
The monopole strength, MS, within a single set of nuclear shape excitations is compared with the MS between different shapes. After misconceptions are pointed out concerning the spin dependence of B(E2) values, MS properties are juxtaposed with gamma-ray and beta-decay properties of /sup 70/Se, /sup 96/Zr, /sup 102/Pd, and the N = 60 isotones to illustrate the utility of combined investigations and evidence is given for the observation of a two-phonon octupole multiplet. Finally, consideration is given to the dominance of the /sup 3/S/sub 1/ force in producing deformation in the N > 50 1g nuclei. 23 refs., 4 figs.
Date:
August 17, 1987
Creator:
Meyer, R.A.
Object Type:
Article
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 129, No. 31, Ed. 1 Wednesday, April 17, 2002
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
April 17, 2002
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Remote I/O : fast access to distant storage.
As high-speed networks make it easier to use distributed resources, it becomes increasingly common that applications and their data are not colocated. Users have traditionally addressed this problem by manually staging data to and from remote computers. We argue instead for a new remote I/O paradigm in which programs use familiar parallel I/O interfaces to access remote file systems. In addition to simplifying remote execution, remote I/O can improve performance relative to staging by overlapping computation and data transfer or by reducing communication requirements. However, remote I/O also introduces new technical challenges in the areas of portability, performance, and integration with distributed computing systems. We propose techniques designed to address these challenges and describe a remote I/O library called RIO that we have developed to evaluate the effectiveness of these techniques. RIO addresses issues of portability by adopting the quasi-standard MPI-IO interface and by defining a RIO device and RIO server within the ADIO abstract I/O device architecture. It addresses performance issues by providing traditional I/O optimizations such as asynchronous operations and through implementation techniques such as buffering and message forwarding to off load communication overheads. RIO uses the Nexus communication library to obtain access to configuration and security mechanisms …
Date:
December 17, 1997
Creator:
Foster, I.; Kohr, D., Jr.; Krishnaiyer, R. & Mogill, J.
Object Type:
Article
System:
The UNT Digital Library
SUBSURFACE REPOSITORY INTEGRATED CONTROL SYSTEM DESIGN
The purpose of this document is to develop preliminary high-level functional and physical control system architectures for the proposed subsurface repository at Yucca Mountain. This document outlines overall control system concepts that encompass and integrate the many diverse systems being considered for use within the subsurface repository. This document presents integrated design concepts for monitoring and controlling the diverse set of subsurface operations. The subsurface repository design will be composed of a series of diverse systems that will be integrated to accomplish a set of overall functions and objectives. The subsurface repository contains several Instrumentation and Control (I&C) related systems including: waste emplacement systems, ventilation systems, communication systems, radiation monitoring systems, rail transportation systems, ground control monitoring systems, utility monitoring systems (electrical, lighting, water, compressed air, etc.), fire detection and protection systems, retrieval systems, and performance confirmation systems. Each of these systems involve some level of I&C and will typically be integrated over a data communication network. The subsurface I&C systems will also integrate with multiple surface-based site-wide systems such as emergency response, health physics, security and safeguards, communications, utilities and others. The scope and primary objectives of this analysis are to: (1) Identify preliminary system level functions and interface …
Date:
September 17, 1998
Creator:
Fernado, C.J.
Object Type:
Report
System:
The UNT Digital Library
Discipline independent aspects of data bank organization
None
Date:
July 17, 1973
Creator:
Howerton, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Seismic analysis of large pools
Large pools for storing spent, nuclear fuel elements are being proposed to augment present storage capacity. To preserve the ability to isolate portions of these pools, a modularization requirement appears desirable. The purpose of this project was to investigate the effects of modularization on earthquake resistance and to assess the adequacy of current design methods for seismic loads. After determining probable representative pool geometries, three rectangular pool configurations, all 240 x 16 ft and 40 ft deep, were examined. One was unmodularized; two were modularized into 80 x 40 ft cells in one case and 80 x 80 ft cells in the other. Both embedded and above-ground installations for a hard site and embedded installations for an intermediate hard site were studied. It was found that modularization was unfavorable in terms of reducing the total structural load attributable to dynamic effects, principally because one or more cells could be left unfilled. The walls of unfilled cells would be subjected to significantly higher loads than the walls of a filled, unmodularized pool. Generally, embedded installations were preferable to above-ground installations, and the hard site was superior to the intermediate hard site. It was determined that Housner's theory was adequate for calculating …
Date:
November 17, 1976
Creator:
Dong, R. G. & Tokarz, F. J.
Object Type:
Report
System:
The UNT Digital Library
Soft X-Ray Fel by Cascading Stages of High Gain Harmonic Generation
Short wavelength Free-Electron Lasers are perceived as the next generation of synchrotron light sources. In the past decade, significant advances have been made in the theory and technology of high brightness electron beams and single pass FELs. These developments facilitate the construction of practical VUV FELs and make x-ray FELs possible. Self-Amplified Spontaneous Emission (SASE) and High Gain Harmonic Generation (HGHG)[17-19] are the two leading candidates for x-ray FELs. The first lasing of HGHG proof-of-principle experiment succeeded in August, 1999 in Brookhaven National Laboratory. The experimental results agree with the theory prediction. Compared with SASE FEL, the following advantages of HGHG FEL were confirmed; (1) Better longitudinal coherence, and hence, much narrower bandwidth than SASE. (2) More stable central wavelength, (3) More stable output energy. In this introduction, we will first briefly describe the principle of HGHG in Section A. Then in Section B, we give a general description about how to produce soft x-ray by cascading HGHG scheme. In section 2, we give a detailed description of the system design. Then, in section 3, we give a description of an analytical estimate for the HGHG process, and the calculation of the parameters of different parts of the system. The …
Date:
April 17, 2003
Creator:
Yu, L. H.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Clyde Covey, July 17, 2019
The National Museum of the Pacific War presents an interview with Clyde Covey. Covey joined the Navy in October of 1945. He served as a Fireman aboard the patrol craft escort, the PCE-870, in Hawaii, completing patrols around Pearl Harbor, and in between the equator and the Aleutians. They had about nine different posts, where they would send up weather balloons with transmitters, radioing weather information back to Pearl Harbor. Covey later completed motor machinist school, and was assigned to PCE-852 at the Underwater Sound Laboratories in New London, Connecticut, developing underwater communication. He received his discharge in December of 1948.
Date:
July 17, 2019
Creator:
Covey, Clyde
Object Type:
Text
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 97, No. 50, Ed. 1 Friday, April 17, 2009
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
April 17, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
NEUTRON PHYSICS DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING SEPTEMBER 1, 1961
Fifty-seven papers and l7 abstracts of papers are presented in the report. Fifty two of the papers are abstracted separately; in addition, a single abstract is written to cover the section on Plasma Physics Theory, which contains 3 papers and 8 abstracts of papers. The two brief papers not abstracted separately are concerned with fast neutron detection, and homogeneous critical assemblies of 3%enriched UF/sub 4/-paraffin systems. (T.F.H.)
Date:
November 17, 1961
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Clyde Covey, July 17, 2019
The National Museum of the Pacific War presents an interview with Clyde Covey. Covey joined the Navy in October of 1945. He served as a Fireman aboard the patrol craft escort, the PCE-870, in Hawaii, completing patrols around Pearl Harbor, and in between the equator and the Aleutians. They had about nine different posts, where they would send up weather balloons with transmitters, radioing weather information back to Pearl Harbor. Covey later completed motor machinist school, and was assigned to PCE-852 at the Underwater Sound Laboratories in New London, Connecticut, developing underwater communication. He received his discharge in December of 1948.
Date:
July 17, 2019
Creator:
Covey, Clyde
Object Type:
Sound
System:
The Portal to Texas History