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Temporally Correct Algorithms for Transaction Concurrency Control in Distributed Databases

Description: Many activities are comprised of temporally dependent events that must be executed in a specific chronological order. Supportive software applications must preserve these temporal dependencies. Whenever the processing of this type of an application includes transactions submitted to a database that is shared with other such applications, the transaction concurrency control mechanisms within the database must also preserve the temporal dependencies. A basis for preserving temporal dependencies i… more
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Date: May 2001
Creator: Tuck, Terry W.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Improving Estimation Accuracy of Aggregate Queries on Data Cubes

Description: In this paper, we investigate the problem of estimation of a target database from summary databases derived from a base data cube. We show that such estimates can be derived by choosing a primary database which uses a proxy database to estimate the results. This technique is common in statistics, but an important issue we are addressing is the accuracy of these estimates. Specifically, given multiple primary and multiple proxy databases, that share the same summary measure, the problem is how t… more
Date: August 15, 2008
Creator: Pourabbas, Elaheh & Shoshani, Arie
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RHIC low energy beam loss projections

Description: For RHIC low-energy operations, we plan to collide Au beams with energies of E = 2:5-10 GeV/u in RHIC. Beams are injected into collision optics, and RHIC runs as a storage ring with no acceleration. At these low energies, observed beam lifetimes are minutes, with measured beam lifetimes of 3.5 min (fast) and 50 min (slow) at E=4.6 GeV/u in the March 2008 test run. With these lifetimes we can operate RHIC as a storage ring to produce reasonable integrated luminosity. This note estimates beam los… more
Date: August 1, 2009
Creator: Satogata, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Luminosity Issues in 2009 100 GeV Polarized Proton Run

Description: Several luminosity issues are reviewed. Questions remain, which are stated for further investigation. Some suggestions are made for possible luminosity improvement. There are several factors affecting the luminosity in 2009 100 GeV polarized proton run: (1) The highest bunch intensity at RHIC early store (1.5 hour after accramp in this note) in 2009 is 1.25 x 10{sup 11} protons. In 2008 run, it was 1.42 x 10{sup 11} protons, which gives rise to 30% higher luminosity if other conditions are the … more
Date: August 1, 2009
Creator: Zhang, S. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Availability On-line Relational Databases for Accelerator Control and Operation

Description: The role that relational database (RDB) technology plays in accelerator control and operation continues to grow in such areas as electronic logbooks, machine parameter definitions, and facility infrastructure management. RDBs are increasingly relied upon to provide the official 'master' copy of these data. Whereas the services provided by the RDB have traditionally not been 'mission critical', the availability of modern RDB management systems is now equivalent to that of standard computer file-… more
Date: May 4, 2009
Creator: Dohan,D.; Dalesio, L. & Carcassi, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement and simulation of the RHIC abort kicker longitudinal impedence

Description: In face of the new upgrades for RHIC the longitudinal impedance of the machine plays an important role in setting the threshold for instabilities and the efficacy of some systems. In this paper we describe the measurement of the longitudinal impedance of the abort kicker for RHIC as well as computer simulations of the structure. The impedance measurement was done by the S{sub 21} wire method covering the frequency range from 9 kHz to 2.5 GHz. We observed a sharp resonance peak around 10 MHz and… more
Date: September 1, 2009
Creator: Abreu, N. P.; Hahn, H. & Choi, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Minimizing I/O Costs of Multi-Dimensional Queries with BitmapIndices

Description: Bitmap indices have been widely used in scientific applications and commercial systems for processing complex,multi-dimensional queries where traditional tree-based indices would not work efficiently. A common approach for reducing the size of a bitmap index for high cardinality attributes is to group ranges of values of an attribute into bins and then build a bitmap for each bin rather than a bitmap for each value of the attribute. Binning reduces storage costs,however, results of queries base… more
Date: March 30, 2006
Creator: Rotem, Doron; Stockinger, Kurt & Wu, Kesheng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Composite OLAP-Object Data Model

Description: In this paper, we define an OLAP-Object model that combines the main characteristics of OLAP and Object data models in order to achieve their functionalities in a common framework. We classify three different object classes: primitive, regular and composite. Then, we define a query language which uses the path concept in order to facilitate data navigation and data manipulation. The main feature of the proposed language is an anchor. It allows us to fix dynamically an object class (primitive, r… more
Date: December 7, 2005
Creator: Pourabbas, Elaheh & Shoshani, Arie
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Power Systems Control Architecture

Description: A diagram provided in the report depicts the complexity of the power systems control architecture used by the national power structure. It shows the structural hierarchy and the relationship of the each system to those other systems interconnected to it. Each of these levels provides a different focus for vulnerability testing and has its own weaknesses. In evaluating each level, of prime concern is what vulnerabilities exist that provide a path into the system, either to cause the system to ma… more
Date: January 1, 2005
Creator: Davidson, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Data-centric computing with the Netezza architecture.

Description: No Description Available.
Date: April 1, 2006
Creator: Davidson, George S.; Cowie, Jim R. (New Mexico State University, Las Cruces, NM); Helmreich, Stephen C. (New Mexico State University, Las Cruces, NM); Zacharski, Ron A. (New Mexico State University, Las Cruces, NM) & Boyack, Kevin W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quench propagation in the HOM damper of the 56 MHz cavity

Description: The aim of this report is to summarize a study of the propagation of a quench in a HOM damper probe of the 56 MHz superconducting storage cavity for RHIC and provide guidance for machine protection. The 56 MHz cavity [1] is designed to operate as a beam-driven superconducting quarter-wave resonator in the RHIC ring. Four Higher Order Mode (HOM) dampers [2] are used to prevent beam instabilities [3] in RHIC. These are inserted in the back wall of the cavity (the high magnetic field region) throu… more
Date: August 1, 2009
Creator: Ben-Zvi, Ilan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Long-Term Strategic Plan for Hanford Sediment Physical Property and Vadose Zone Hydraulic Parameter Databases

Description: Physical property data and unsaturated hydraulic parameters are critical input for analytic and numerical models used to predict transport and fate of contaminants in variably saturated porous media and to assess and execute remediation alternatives. The Remediation Decision Support (RDS) project, managed by the Pacific Northwest National Laboratory (PNNL) for the U.S. Department of Energy (DOE) and the CH2M Hill Plateau Remediation Company (CHPRC), has been compiling physical and hydraulic pro… more
Date: September 30, 2009
Creator: Rockhold, Mark L.; Last, George V. & Middleton, Lisa A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report

Description: The results of the DOE-funded Mouse Genome Sequence (MGS) project include a significant enhancement in the capacity of the community to connect biological knowledge with the mouse genome sequence in a comparative context. The resources developed as the result of the activities of the MGS project staff are used extensively by both individual researchers and other informatics groups.
Date: November 24, 2003
Creator: J., Bult Carol
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation Strategies for Bitmap Indices with Binning

Description: Bitmap indices are efficient data structures for querying read-only data with low attribute cardinalities. To improve the efficiency of the bitmap indices on attributes with high cardinalities, we present a new strategy to evaluate queries using bitmap indices. This work is motivated by a number of scientific data analysis applications where most attributes have cardinalities in the millions. On these attributes, binning is a common strategy to reduce the size of the bitmap index. In this artic… more
Date: June 3, 2004
Creator: Stockinger, Kurt; Wu, Kesheng & Shoshani, Arie
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

FP-tree Based Spatial Co-location Pattern Mining

Description: A co-location pattern is a set of spatial features frequently located together in space. A frequent pattern is a set of items that frequently appears in a transaction database. Since its introduction, the paradigm of frequent pattern mining has undergone a shift from candidate generation-and-test based approaches to projection based approaches. Co-location patterns resemble frequent patterns in many aspects. However, the lack of transaction concept, which is crucial in frequent pattern mining, … more
Date: May 2005
Creator: Yu, Ping
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

TableMaker: An ad hoc Query Tool for Relational Databases

Description: This paper discusses an ad hoc query tool for relational databases. Most Web servers hosting biological data limit users to a defined set of search options and output formats that are short of the whole range of options available to users with direct database access. However, to make full use of the wealth of data in the database resource, it is desirable to have an intermediate solution that provides a broad range of flexible query and output options through a Web portal.
Date: July 2008
Creator: Lushbough, Carol; Duvick, Jon; Dong, Qunfeng; Jennewein, Douglas; Reynoldson, Joe & Brendel, Volker
Item Type: Refine your search to only Paper
Partner: UNT College of Arts and Sciences
open access

Bioethical Biobanks: Three Concerns in Designing and Using Law Enforcement DNA Identification Databases

Description: Federal and state law enforcement authorities have amassed large collections of DNA samples and the identifying profiles derived from them. These databases help to identify the guilty and to exonerate the innocent, but as the databanks grow, so do fears about civil liberties. The research reported here discusses three legal and social policy issues that have been raised in regard to these biobanks—the choice of loci to type for identifying individuals, the indefinite retention of DNA samples, a… more
Date: October 19, 2006
Creator: Kaye, D.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Updating System for the Gridded Population Database of China Based on Remote Sensing, GIS and Spatial Database Technologies

Description: Describes the development of a Spatial Population Updating System (SPUS) for updating the gridded population database of China based on remote sensing, GIS and spatial database technologies, with a spatial resolution of 1 km by 1 km.
Date: February 20, 2009
Creator: Yang, Xiaohuan; Huang, Yaohuan; Dong, Pinliang; Jiang, Dong & Liu, Honghui
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Compressing bitmap indices by data reorganization

Description: Many scientific applications generate massive volumes of data through observations or computer simulations, bringing up the need for effective indexing methods for efficient storage and retrieval of scientific data. Unlike conventional databases, scientific data is mostly read-only and its volume can reach to the order of petabytes, making a compact index structure vital. Bit map indexing has been successfully applied to scientific databases by exploiting the fact that scientific data are enume… more
Date: July 1, 2004
Creator: Pinar, Ali; Tao, Tao & Ferhatosmanoglu, Hakan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The DOE Subsurface Microbial Culture Collection (SMCC)

Description: The primary activities associated with maintenance of the Subsurface Microbial Culture Collection (SMCC) were designed to ensure that the collection served as a valuable resource to DOE-funded and other scientists, especially DOE-funded scientists associated with the NABIR Program. These activities were carried out throughout the period covered by this report and in-cluded: (1) assistance in the selection of cultures for research, (2) distribution of cultures and/or data on request, (3) incorpo… more
Date: May 23, 2006
Creator: Balkwill, David L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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