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3,809 Matching Results
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Dynamic Resource Management in RSVP- Controlled Unicast Networks
Resources are said to be fragmented in the network when they are available in non-contiguous blocks, and calls are dropped as they may not end sufficient resources. Hence, available resources may remain unutilized. In this thesis, the effect of resource fragmentation (RF) on RSVP-controlled networks was studied and new algorithms were proposed to reduce the effect of RF. In order to minimize the effect of RF, resources in the network are dynamically redistributed on different paths to make them available in contiguous blocks. Extra protocol messages are introduced to facilitate resource redistribution in the network. The Dynamic Resource Redistribution (DRR) algorithm when used in conjunction with RSVP, not only increased the number of calls accommodated into the network but also increased the overall resource utilization of the network. Issues such as how many resources need to be redistributed and of which call(s), and how these choices affect the redistribution process were investigated. Further, various simulation experiments were conducted to study the performance of the DRR algorithm on different network topologies with varying traffic characteristics.
Date:
December 2001
Creator:
Iyengar Prasanna, Venkatesan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Controlled Velocity Testing of an 8-kW Wind Turbine
This paper describes a case study of the controlled-velocity test of an 8-kW wind turbine. The turbine was developed in response to the U.S. Department of Energy's small wind turbine program. As background, the prototype development is discussed. The turbine mechanical and electrical components are described. The turbine was tested on a flatbed truck and driven down an airfield runway at constant relative wind speed. Horizontal furling was used to control over-speed. Various parameters were changed to determine their effects on furling. The testing showed that the machine had insufficient rotor offset for adequate furling. Also, a rotor resonance problem was discovered and remedied. Problems associated with taking the measurements made it difficult to determine if the truck test was a suitable method for code validation. However, qualitative observations gleaned from the testing justified the effort.
Date:
July 31, 2001
Creator:
Larwood, S.; Sencenbaugh, J. & Acker, B.
Object Type:
Article
System:
The UNT Digital Library
Agriculture: A List of Websites
This list provides a sampling of the rapidly proliferating number of agricultural resources available on the Internet. It is not intended to be exhaustive. It is divided into 24 main categories and 15 subcategories.
Date:
February 8, 2001
Creator:
Canada, Carol
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Transport and Dispersion Models: A Controlled Comparison of HPAC and NARAC Predictions
During fiscal year 2000, a series of studies in support of the Defense Threat Reduction Agency (DTRA) was begun. The goal of these studies is to improve the verification, validation, and accreditation (VV&A) of hazard prediction and assessment models and capabilities. These studies are part of a larger joint VV&A collaborative effort that DTRA and the Department of Energy (DOE), via the Lawrence Livermore National Laboratory (LLNL), are conducting. This joint effort includes comparisons of the LLNL and DTRA transport and dispersion (T&D) modeling systems, NARAC and HPAC, respectively. The purpose of this work is to compare, in a systematic way, HPAC and NARAC model predictions for a set of controlled hypothetical release scenarios. Only ''model-versus-model'' comparisons are addressed in this work. Model-to-field trial comparisons for HPAC and NARAC have been addressed in a recent companion study, in support of the same joint VV&A effort.
Date:
May 1, 2001
Creator:
Warner, S; Heagy, J F; Platt, N; Larson, D; Sugiyama, G; Nasstrom, J S et al.
Object Type:
Article
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin Progress Report
In the structure task, the authors completed reducing the data they had collected from a N-S transect on the east side of Seneca Lake. They have calculated the fracture frequency for all the fracture sets at each site, and constructed modified rose diagrams that summarize the fracture attributes at each site. These data indicate a N-striking fault near the southeastern shore of Seneca Lake, and also indicate NE and ENE-trending FIDs and faults north of Valois. The orientation and existence of the ENE-striking FIDs and faults are thought to be guided by faults in the Precambrian basement. These basement faults apparently were sufficiently reactivated to cause faulting in the Paleozoic section. Other faults are thrust ramps above the Silurian salt section that were controlled by a far-field Alleghanian stress field. Structure contour maps and isopach maps have been revised based on additional well log analyses. Except for the Glodes Corners Field, the well spacing generally is insufficient to definitely identify faults. However, relatively sharp elevational changes east of Keuka Lake support the contention that faults occur along the east side of Keuka Lake. Outcrop stratigraphy along the east side of Seneca Lake indicates that faults and gentle folds can be …
Date:
June 30, 2001
Creator:
Jacobi, Robert & Fountain, John
Object Type:
Report
System:
The UNT Digital Library
Innovative Methodology for Detection of Fracture-Controlled Sweet Spots in the Northern Appalachian Basin Progress Report
In the structure task, we completed a N-S transect east of Seneca Lake that indicated a N-striking fault near the southeastern shore of Seneca Lake, and also indicated NE and ENE-trending FIDs and faults north of Valois. The orientation and existence of the NE-striking FIDs and faults are thought to be controlled by basement faults, rather than thrust ramps above the Salina salt controlled only by a far-field Alleghanian stress field. Structure contour maps based on well log analyses have been constructed but not interpreted. Soil gas data displayed a number of ethane-charged soil gas ''spikes'' on a N-S transect from Ovid south to near Valois. The soil gas team found a larger number of spikes in the northern half of the survey, suggesting more open fractures (and faults) in the northern half of the survey. Seismic data has been purchased and reprocessed. Several grabens observed in the Trenton reflector are consistent with surface structure, soil gas, and aeromagnetic anomalies. The aeromagnetic survey is completed and the data is processed. Prominent magnetic anomalies suggest that faults in the Precambrian basement are located beneath regions where grabens in the Trenton are located.
Date:
February 28, 2001
Creator:
Jacobi, Robert & Fountain, John
Object Type:
Report
System:
The UNT Digital Library
Assisted Suicide and the Controlled Substances Act: Legal Issues Associated with the Proposed Pain Relief Promotion Act
The Pain Relief Promotion Act, as proposed in the 106th Congress, provided that the Attorney General, in determining whether the registration of a doctor for the administration of controlled substances is in the public interest, should give no force and effect to state law authorizing or permitting assisted suicide or euthanasia. This language would appear to have been designed to abrogate the legal reasoning set forth by the Attorney General in a press release regarding the application of the Controlled Substances Act to acts of physician-assisted suicide. It would not, however, appear to have required the Attorney General to revoke such registrations; nor would it have criminalized assisted suicide or euthanasia. This report will be updated as congressional action warrants.
Date:
January 12, 2001
Creator:
Thomas, Kenneth R.
Object Type:
Report
System:
The UNT Digital Library
Local Measurement of Fuel Energy Deposition and Heat Transfer Environment During Fuel Lifetime Using Controlled Calorimetry
A comprehensive description of the accomplishments of the DOE grant titled, ''Local Measurement of Fuel Energy Deposition and Heat Transfer Environment During Fuel Lifetime using Controlled Calorimetry''.
Date:
December 31, 2001
Creator:
Miller, D. W.; Kauffmann, A.; Kreidler, E.; Li, D.; Liu, H.; Mills, D. et al.
Object Type:
Report
System:
The UNT Digital Library
2001 Gordon Research Conference on Organometallic Chemistry. Final progress report [agenda and attendee list]
The Gordon Research Conference on Organometallic Chemistry was held at Salve Regina University, Newport, Rhode Island, July 22-27, 2001. The conference had 133 participants. The attendees represented the spectrum of endeavor in this field, coming from academia, industry, and government laboratories, and included US and foreign scientists, senior researchers, young investigators, and students. Emphasis was place on current unpublished research and discussion of the future target areas in this field. There was a conscious effort to stimulate lively discussion about the key issues in the field today. Time for formal presentations was limited in the interest of group discussions; poster sessions were held.
Date:
July 27, 2001
Creator:
Burns, Carol
Object Type:
Report
System:
The UNT Digital Library
2001 Gordon Research Conference on Quantum Control of Light and Matter. Final progress report [agenda and attendee list]
The Gordon Research Conference on Quantum Control of Light and Matter [Quantum Control of Atomic and Molecular Motion] was held at Mount Holyoke College, South Hadley, Massachusetts, July 29 - August 3, 2001. The conference was attended by 119 participants. The attendees represented the spectrum of endeavor in this field, coming from academia, industry, and government laboratories, and included US and foreign scientists, senior researchers, young investigators, and students. Emphasis was placed on current unpublished research and discussion of the future target areas in this field. There was a conscious effort to stimulate discussion about the key issues in the field today. Session topics included the following: General perspectives, Phase control, Optimal control, Quantum information, Light manipulation and manipulation with light, Control in the condensed phase, Strong field control, Laser cooling and Bose-Einstein Condensate dynamics, and Control in the solid phase.
Date:
August 3, 2001
Creator:
Shapiro, Moshe
Object Type:
Report
System:
The UNT Digital Library
Determination of Importance Evaluation for Exploratory Studies Facility (ESF) Subsurface Testing Activities
This Determination of Importance Evaluation (DIE) applies to the Subsurface Exploratory Studies Facility (ESF), encompassing the Topopah Spring (TS) Loop from Station 0+00 meters (m) at the North Portal to breakthrough at the South Portal (approximately 78+77 m), and ancillary test and operation support areas including the Enhanced Characterization of the Repository Block (ECRB) Cross Drift. This evaluation applies specifically to site characterization testing activities ongoing and planned in the Subsurface ESF. ESF site characterization activities are being performed to obtain the information necessary to determine whether the Yucca Mountain Site is suitable as a geologic repository for spent nuclear fuel and high-level radioactive waste. A more detailed description of these testing activities is provided in Section 6 of this DIE. Generally, the construction and operation of excavations associated with these testing activities are evaluated in the DIE for the Subsurface ESF (CRWMS M&O 1999a) and the DIE for the ESF ECRB Cross Drift (CRWMS M&O 2000a). The scope of this DIE also entails the proposed Unsaturated Zone (UZ) Transport Test at Busted Butte. Although, not a part of the TS Loop or ECRB Cross Drift, the associated testing activities are Subsurface testing activities. Busted Butte is located to the …
Date:
February 20, 2001
Creator:
Byrne, C.J.
Object Type:
Report
System:
The UNT Digital Library
Export Controls: Clarification of Jurisdiction for Missile Technology Items Needed
A letter report issued by the General Accounting Office with an abstract that begins "The U.S. government has long been concerned about the growing threat posed by the proliferation of missiles and related technologies that can deliver weapons of mass destruction. The United States is working with other countries through the Missile Technology Control Regime to control the export of missile-related items. The Departments of Commerce and State share primary responsibility for controlling exports of Regime items. The Commerce Department is required to control Regime items that are dual-use on its export control list--the Commerce Control List. All other Regime items are to be controlled by the State Department on its export control list--the U.S. Munitions List. However, the two departments have not clearly established which of them has jurisdiction for almost 25 percent of the items the United States agreed to control. The Departments disagree on how to determine which Regime items are controlled by Commerce and which are controlled by State. Consultations between the departments about respective control lists have not resolved these jurisdiction issues. Unclear jurisdiction may result in the same Regime item being subject to different export control restrictions and processes at the two departments."
Date:
October 9, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Accounting Data to Web Interface Using PERL
This document will explain the process to create a web interface for the accounting information generated by the High Performance Storage Systems (HPSS) accounting report feature. The accounting report contains useful data but it is not easily accessed in a meaningful way. The accounting report is the only way to see summarized storage usage information. The first step is to take the accounting data, make it meaningful and store the modified data in persistent databases. The second step is to generate the various user interfaces, HTML pages, that will be used to access the data. The third step is to transfer all required files to the web server. The web pages pass parameters to Common Gateway Interface (CGI) scripts that generate dynamic web pages and graphs. The end result is a web page with specific information presented in text with or without graphs. The accounting report has a specific format that allows the use of regular expressions to verify if a line is storage data. Each storage data line is stored in a detailed database file with a name that includes the run date. The detailed database is used to create a summarized database file that also uses run date …
Date:
August 13, 2001
Creator:
Hargeaves, C
Object Type:
Report
System:
The UNT Digital Library
Classification of the MGR Carrier/Cask Handling System
The purpose of this analysis is to document the Quality Assurance (QA) classification of the Monitored Geologic Repository (MGR) carried cask handling system structures, systems and components (SSCs) performed by the MGR Preclosure Safety and Systems Engineering Section. This analysis also provides the basis for revision of YMP/90-55Q, Q-List (YMP 2000). The Q-List identifies those MGR SSCs subject to the requirements of DOE/RW-0333P, ''Quality Assurance Requirements and Description'' (QARD) (DOE 2000).
Date:
February 8, 2001
Creator:
Ziegler, J. A.
Object Type:
Report
System:
The UNT Digital Library
Performance-Driven Robust Identification and Control of Uncertain Dynamical Systems
The grant DEFG02-97ER13939 from the Department of Energy has supported our research program on robust identification and control of uncertain dynamical systems, initially for the three-year period June 15, 1997-June 14, 2000, which was then extended on a no-cost basis for another year until June 14, 2001. This final report provides an overview of our research conducted during this period, along with a complete list of publications supported by the Grant. Within the scope of this project, we have studied fundamental issues that arise in modeling, identification, filtering, control, stabilization, control-based model reduction, decomposition and aggregation, and optimization of uncertain systems. The mathematical framework we have worked in has allowed the system dynamics to be only partially known (with the uncertainties being of both parametric or structural nature), and further the dynamics to be perturbed by unknown dynamic disturbances. Our research over these four years has generated a substantial body of new knowledge, and has led to new major developments in theory, applications, and computational algorithms. These have all been documented in various journal articles and book chapters, and have been presented at leading conferences, as to be described. A brief description of the results we have obtained within the …
Date:
October 29, 2001
Creator:
Basar, Tamer
Object Type:
Report
System:
The UNT Digital Library
Classification of the MGR Emplacement Drift System
The purpose of this analysis is to document the Quality Assurance (QA) classification of the Monitored Geologic Repository (MGR) emplacement drift system structures, systems and components (SSCs) performed by the MGR Preclosure Safety and Systems Engineering Section. This analysis also provides the basis for revision of YMP/90-55Q, Q-List (YMP 2000). The Q-List identifies those MGR SSCs subject to the requirements of DOE/RW-0333P7 Quality Assurance Requirements and Description (QARD) (DOE 2000).
Date:
February 1, 2001
Creator:
Ziegler, J. A.
Object Type:
Report
System:
The UNT Digital Library
Classification of the MGR Carrier Preparation Building Materials Handling System
The purpose of this analysis is to document the Quality Assurance (QA) classification of the Monitored Geologic Repository (MGR) carrier preparation building materials handling system structures, systems and components (SSCs) performed by the MGR Preclosure Safety and Systems Engineering Section. This analysis also provides the basis for revision of YMP/90-55Q, Q-List (YMP 2000). The Q-List identifies those MGR SSCs subject to the requirements of DOE/RW-0333P7 ''Quality Assurance Requirements and Description'' (QARD) (DOE 2000).
Date:
February 8, 2001
Creator:
Ziegler, J. A.
Object Type:
Report
System:
The UNT Digital Library
High Temperature Materials Laboratory Thirteenth Annual Report: October 1999 Through September 2000
The High Temperature Materials Laboratory (HTML) User Program continued to work with industrial, academic, and governmental users this year, accepting 86 new projects and developing 50 new user agreements. The table on the following page presents the breakdown of these statistics. The figure on page 2 depicts the continued growth in user agreements and user projects. You may note that our total number of proposals is nearing 1000, and we expect to achieve this number in our first proposal review meeting of FY 2001. The large number of new agreements bodes well for the future. A list of proposals to the HTML follows this section; at the end of the report, we present a list of agreements between HTML and universities and industries, broken down by state. Program highlights this year included several outstanding user projects (some of which are discussed in later sections), the annual meeting of the HTML Programs Senior Advisory Committee, the completion of a formal Multiyear Program Plan (MYPP), and finalization of a purchase agreement with JEOL for a new-generation electron microscope.
Date:
November 7, 2001
Creator:
Pasto, AE
Object Type:
Report
System:
The UNT Digital Library
Use of GIS to Identify and Delineate Areas of Fluoride, Sulfate, Chloride, and Nitrate Levels in the Woodbine Aquifer, North Central Texas, in the 1950s, 1960s, 1970s, 1980s, and 1990s
ArcView and ArcInfo were used to identify and delineate areas contaminated by fluoride, sulfate, chloride, and nitrate in the Woodbine Aquifer. Water analysis data were obtained from the TWDB from the 1950s to 1990s covering 9 counties. 1990s land use data were obtained to determine the relationship with each contaminant. Spearman's rank correlation coefficients and Kruskal-Wallis tests were used to calculate relationships between variables. Land uses had little effect on distributions of contaminants. Sulfate and fluoride levels were most problematic in the aquifer. Depth and lithology controlled the distributions of each contaminant. Nitrate patterns were controlled mainly by land use rather than geology, but were below the maximum contaminant level. In general, contaminant concentrations have decreased since the 1950s.
Date:
August 2001
Creator:
Sanmanee, Sirichai
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
MERCURY RELEASE FROM DISTURBED ANOXIC SOILS
The primary objectives of experiments conducted at the Energy & Environmental Research Center (EERC) were to provide information on the secondary release of mercury from contaminated anoxic sediments to an aqueous environment after disturbance/change of in situ physical conditions and to evaluate its migration and partitioning under controlled conditions, including implications of these processes for treatment of contaminated soils. Experimental work included (1) characterization of the mercury-contaminated sediment; (2) field bench-scale dredging simulation; (3) laboratory column study to evaluate a longer-term response to sediment disturbance; (4) mercury volatilization from sediment during controlled drying; (5) resaturation experiments to evaluate the potential for secondary release of residual mercury after disturbance, transport, drying, and resaturation, which simulate a typical scenario during soil excavation and transport to waste disposal facilities; and (6) mercury speciation and potential for methylation during column incubation experiments.
Date:
July 16, 2001
Creator:
Solc, Jaroslav & Bolles, Bethany A.
Object Type:
Report
System:
The UNT Digital Library
Export Controls: Regulatory Change Needed to Comply with Missile Technology Licensing Requirements
A letter report issued by the General Accounting Office with an abstract that begins "The United States and several major trading partners created the Missile Technology Control Regime in 1987 to control the spread of missile technology. To carry out the U.S. commitment to the agreement, Congress passed the National Defense Authorization Act of Fiscal Year 1991, which amended two U.S. export control statutes: the Export Administration Act and the Arms Export Control Act. Two federal agencies, the Department of Commerce and the Department of State, are responsible for implementing the regulations for controlling missile technology exports. This report discusses whether the regulations for controlling the export of Missile Technology Control Regime items (1) are consistent with U.S. law and (2) provide a consistent U.S. policy on the control of missile technology. GAO found that Commerce's export regulations are inconsistent with an amendment to the Export Administration Act that requires an individual export license for all controlled dual-use missile equipment and technology to all countries. Commerce's regulations do not require licenses for the export of controlled missile equipment and technology to Canada. Commerce did not cite any section of this statute or its legislative history to justify the inconsistency between …
Date:
May 31, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Equivalency of paper-pencil tests and computer-administered tests.
Access:
Use of this item is restricted to the UNT Community
Are computer-administered versions of a multiple choice paper-pencil test equivalent? This study determined whether there were any significant differences between taking a traditional pencil-paper test and taking the same test using a computer. The literature has shown that there are intervening variables that have caused differences when not controlled. To prove equivalency between test modes, scores have to have similar means, dispersions, and shapes; the ranked-order of the scores must also be similar. Four tests were given over the course of a 16-week semester. The sample was divided, half taking paper-pencil tests and half taking the same test administered by a computer. The mode of administration was switched with each test administration. The analysis showed that, when the intervening variables were controlled, the two modes of administration were equivalent. The analysis used a 2x4 ANOVA, which showed no difference between test modes, but showed that each test administration was significantly different. The Levene statistic was used to test whether dispersions were equivalent and confidence intervals were established to test the kurtosis and skewness statistics. Finally, each of the test scores were transformed into their Normal Curve Equivalents so that Pearson's coefficient could be used to determine the equivalency of the …
Date:
May 2001
Creator:
Whitworth, Clifford K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Packet spacing : an enabling mechanism for delivering multimedia content in computational grids /
Streaming multimedia with UDP has become increasingly popular over distributed systems like the Internet. Scientific applications that stream multimedia include remote computational steering of visualization data and video-on-demand teleconferencing over the Access Grid. However, UDP does not possess a self-regulating, congestion-control mechanism; and most best-efort traflc is served by congestion-controlled TCF! Consequently, UDP steals bandwidth from TCP such that TCP$ows starve for network resources. With the volume of Internet traffic continuing to increase, the perpetuation of UDP-based streaming will cause the Internet to collapse as it did in the mid-1980's due to the use of non-congestion-controlled TCP. To address this problem, we introduce the counterintuitive notion of inter-packet spacing with control feedback to enable UDP-based applications to perform well in the next-generation Internet and computational grids. When compared with traditional UDP-based streaming, we illustrate that our approach can reduce packet loss over SO% without adversely afecting delivered throughput. Keywords: network protocol, multimedia, packet spacing, streaming, TCI: UDlq rate-adjusting congestion control, computational grid, Access Grid.
Date:
January 1, 2001
Creator:
Feng, A. C. (Annette C.); Feng, W. C. (Wu-Chun) & Belford, Geneva G.
Object Type:
Article
System:
The UNT Digital Library
Effects of inter-packet spacing on the delivery of multimedia content
Streaming multimedia content with UDP has become increasingly popular over distributed systems such as the Internet. However, because UDP does not possess any congestion-control mechanism and most best-effort trafic is served by the congestion-controlled TCP, UDP flows steal bandwidth from TCP to the point that TCP flows can starve for network resources. Furthermore, such applications may cause the Internet infrastructure to eventually suffer from congestion collapse because UDP trafic does not self-regulate itself. To address this problem, next-generation Internet routers will implement active queue-management schemes to punish malicious traffic, e.g., non-adaptive UDP flows, and to the improve the performance of congestion-controlled traffic, e.g., TCP flows. The arrival of such routers will cripple the performance of today's UDP-based multimedia applications. So, in this paper, we introduce the notion of inter-packet spacing with control feedback to enable these UDP-based applications to perform well in the next-generation Internet while being adaptive and self-regulating. When compared with traditional UDP-based multimedia streaming, we illustrate that our counterintuitive, interpacket-spacing scheme with control feedback can reduce packet loss by 90% without adversely affecting delivered throughput. Keywords: network protocol, multimedia, packet spacing, rate-adjusting congestion control.
Date:
January 1, 2001
Creator:
Kapadia, Apu Chandrasen; Feng, Annette C. & Feng, Wu-Chun
Object Type:
Article
System:
The UNT Digital Library