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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

File caching in data intensive scientific applications

Description: We present some theoretical and experimental results of animportant caching problem that arises frequently in data intensivescientific applications. In such applications, jobs need to processseveral files simultaneously, i.e., a job can only be serviced if all itsneeded files are present in the disk cache. The set of files requested bya job is called a file-bundle. This requirement introduces the need forcache replacement algorithms based on file-bundles rather then individualfiles. We show tha… more
Date: July 18, 2004
Creator: Otoo, Ekow; Rotem, Doron; Romosan, Alexandru & Seshadri, Sridhar
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Survey of High-Quality Computational Libraries and their Impactin Science and Engineering Applications

Description: Recently, a number of important scientific and engineering problems have been successfully studied and solved by means of computational modeling and simulation. Many of these computational models and simulations benefited from the use of available software tools and libraries to achieve high performance and portability. In this article, we present a reference matrix of the performance of robust, reliable and widely used tools mapped to scientific and engineering applications that use them. We a… more
Date: September 20, 2004
Creator: Drummond, L. A.; Hernandez, V.; Marques, O.; Roman, J. E. & Vidal, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Methyl jasmonate and yeast elicitor induce differential transcriptional and metabolic re-programming in cell suspension cultures of the model legume Medicago truncatula

Description: Article on methyl jasmonate and yeast elicitor induce differential transcriptional and metabolic re-programming in cell suspension cultures of the model legume Medicago truncatula.
Date: March 1, 2005
Creator: Suzuki, Hideyuki; Reddy, M. S. Srinivasa; Naoumkina, Marina A.; Aziz, Naveed; May, Gregory D.; Huhman, David et al.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Volume visualization of multiple alignment of large genomicDNA

Description: Genomes of hundreds of species have been sequenced to date, and many more are being sequenced. As more and more sequence data sets become available, and as the challenge of comparing these massive ''billion basepair DNA sequences'' becomes substantial, so does the need for more powerful tools supporting the exploration of these data sets. Similarity score data used to compare aligned DNA sequences is inherently one-dimensional. One-dimensional (1D) representations of these data sets do not effe… more
Date: July 25, 2005
Creator: Shah, Nameeta; Dillard, Scott E.; Weber, Gunther H. & Hamann, Bernd
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Transgenic Medicago truncatula plants obtained from Agrobacterium tumefaciens-transformed roots and Agrobacterium rhizogenes-transformed hairy roots

Description: Article on transgenic Medicago truncatula plants obtained from Agrobacterium tumefaciens-transformed roots and Agrobacterium rhizogenes-transformed hairy roots.
Date: March 31, 2006
Creator: Crane, Cynthia; Wright, Elane; Dixon, R. A. & Wang, Z.-Y. (Zeng-Yu), 1963-
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Mapping Physical Formats to Logical Models to Extract Data and Metadata: The Defuddle Parsing Engine

Description: Scientists, fueled by the desire for systems-level understanding of phenomena, increasingly need to share their results across multiple disciplines. Accomplishing this requires data to be annotated, contextualized, and readily searchable and translated into other formats. While these requirements can be addressed by custom programming or obviated by community standardization, neither approach has ‘solved’ the problem. In this paper, we describe a complementary approach – a general capability fo… more
Date: July 25, 2006
Creator: Talbott, Tara D.; Schuchardt, Karen L.; Stephan, Eric G. & Myers, James D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Role of C and P Sites on the Chemical Activity of Metal Carbide and Phosphides: From Clusters to Single-Crystal Surfaces

Description: Transition metal carbides and phosphides have shown tremendous potential as highly active catalysts. At a microscopic level, it is not well understood how these new catalysts work. Their high activity is usually attributed to ligand or/and ensemble effects. Here, we review recent studies that examine the chemical activity of metal carbide and phosphides as a function of size, from clusters to extended surfaces, and metal/carbon or metal/phosphorous ratio. These studies reveal that the C and P s… more
Date: July 1, 2007
Creator: Rodriguez, J. A.; Vines, F.; Liu, P. & Illas, F.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Bacteria in Permafrost

Description: Significant numbers of viable ancient microorganisms are known to be present within the permafrost. They have been isolated in both polar regions from the cores up to 400 m deep and ground temperatures of -27 C. The age of the cells corresponds to the longevity of the permanently frozen state of the soils, with the oldest cells dating back to {approx}3 million years in the Arctic, and {approx}5 million years in the Antarctic. They are the only life forms known to have retained viability over ge… more
Date: January 1, 2008
Creator: Gilichinsky, David A.; Vishnivetskaya, Tatiana A.; Petrova, Maya A.; Spirina, Elena V.; Mamikin, Vladimir & Rivkina, Elizaveta
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Aberration-Coreected Electron Microscopy at Brookhaven National Laboratory

Description: The last decade witnessed the rapid development and implementation of aberration correction in electron optics, realizing a more-than-70-year-old dream of aberration-free electron microscopy with a spatial resolution below one angstrom [1-9]. With sophisticated aberration correctors, modern electron microscopes now can reveal local structural information unavailable with neutrons and x-rays, such as the local arrangement of atoms, order/disorder, electronic inhomogeneity, bonding states, spin c… more
Date: April 1, 2008
Creator: Zhu, Y. & Wall, J.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Proteomic Insights: Cryoadaption of Permafrost Bacteria

Description: The permafrost microbial community has been described as 'a community of survivors' (Friedman 1994). Because of the permanently cold condition and the long term isolation of the permafrost sediments, the permafrost microorganisms have acquired various adaptive features in the membrane, enzymes, and macromolecular synthesis. This chapter reviews the different adaptive mechanisms used by permafrost microorganisms with a focus on the proteomic level of cryoadaptation that have recently been identi… more
Date: January 1, 2009
Creator: Qiu, Yinghua; Vishnivetskaya, Tatiana A. & Lubman, David M.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Viable Cyanobacteria and Green Algae from the Permafrost Darkness

Description: This review represents an overview of the existence, distribution and abundance of the photoautotrophic microorganisms in the deep subsurface permafrost of the Northeast Russia and McMurdo Dry Valleys, Antarctica. The morphology, growth rate, spectral properties, phylogenetic position of the viable permafrost green algae and cyanobacteria have been studied. Viable photoautotrophs were represented by unicellular green algae and filamentous cyanobacteria with low growth rate. Spectral studies of … more
Date: January 1, 2009
Creator: Vishnivetskaya, Tatiana A.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

The Decomposition of Human-Written Book Summaries

Description: In this paper, the authors evaluate the extent to which human-written book summaries can be obtained through cut-and-paste operations from the original book. The authors analyze the effect of the parameters involved in the decomposition algorithm, and highlight the distinctions in coverage obtained for different summary types.
Date: March 2009
Creator: Ceylan, Hakan & Mihalcea, Rada, 1974-
Item Type: Refine your search to only Paper
Partner: UNT College of Engineering
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