Physical Sciences and Mathematics Commons^™

Mpeg-21 Digital Item Declaration And Identification-Principles And Compression, I. S. Burnett, S. J. Davis, G. M. Drury

Faculty of Informatics - Papers (Archive)

At the core of the MPEG-21 Multimedia Framework is the concept of the Digital Item, a virtual container for a hierarchical structure of metadata and resources. This paper considers the Digital Item Declaration Language (DIDL), gives examples of its usage, and discusses how it is used to integrate other parts of MPEG-21. The paper then discusses how Digital Item Identification integrates with the DIDL to allow MPEG-21 to utilize standard identifiers from many application spaces. Finally, an alternative, compressed form of the XML Digital Item Declaration is described. This uses schema-based compression to significantly reduce the size of these XML …

An Infinite Family Of Goethals-Seidel Arrays, M. Xia, Tianbing Xia, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this paper we construct an infinite family of Goethals-Seidel arrays and prove the theorem: If q = 4n - 1 is a prime power = 3(mod 8), then there exists an Hadamard matrix of order 4n of Goethals-Seidel type

Critical Sets In Orthogonal Arrays With 7 And 9 Levels, R. Saharay, Avishek Adhikari, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

To date very few results are known on the critical sets for a set of Mutually Orthogonal Latin Squares(MOLS). In this paper, we consider Orthogonal Array OA(n2, k + 2, n, 2) constructed from k mutually orthogonal cyclic latin squares of order n and obtain bounds on the possible sizes of the minimal critical sets. In particular, for n = 7 we exhibit a critical set, thereby improving the bound reported in Keedwell (1997). The problem is also addressed for n = 9 and a critical set is also presented.

An Exposure Property Of Block Designs, Y. Wang, Jennifer Seberry, Beata J. Wysocki, Tadeusz A. Wysocki, L. C. Tran, Y. Zhao, Tianbing Xia

Faculty of Informatics - Papers (Archive)

An exposure property of block designs is defined and investigated in this paper. The families of c-exposed designs are shown for c = 2 and c = 3. A sufficient condition for a c-exposed design is derived.

A Construction Technique For Generalized Complex Orthogonal Designs And Applications To Wireless Communications , Jennifer Seberry, S. A. Spence, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

We introduce a construction technique for generalized complex linear processing orthogonal designs, which are p x n matrices X satisfying XHX = f I, where f is a complex quadratic form, I is the identity matrix, and X has complex entries. These matrices generalize the familiar notions of orthogonal designs and generalized complex orthogonal designs. We explain the application of these matrices to space-time block coding for multiple-antenna wireless communications. In particular, we discuss the practical strengths of the space-time block codes constructed via our proposed technique

Critical Sets For A Pair Of Mutually Orthogonal Cyclic Latin Squares Of Odd Order Greater Than 9, R. Saharay, Avishek Adhikari, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

To date investigations on critical sets for a set of mutually orthogonal latin squares (MOLS) have been carried out only for small orders less than or equal to 9. In this paper we deal with a pair of cyclic orthogonal latin squares of order n, n greater than or equal to 11, n odd. Through construction of a uniquely completable set we give an upper bound on the size of the minimal critical set. In particular for n = 15 a critical set achieving this bound is obtained.

On Orthogonal Designs In Order 48, W. H. Holzmann, H Kharaghani, Jennifer Seberry, B. Tayfeh-Rezaie

Faculty of Informatics - Papers (Archive)

We show that all 3164 possible OD(48; s1, s2,s3) exist. In addition to the use of some classical techniques we employ two new method of construction.

An Approximate Arrangement Algorithm For Semi-Algebraic Curves, Victor Milenkovic, Elisha Sacks

Department of Computer Science Technical Reports

No abstract provided.

Redundant-Reader Elimination In Rfid Systems, Bogdan Carbunar, Murali Krishna Ramanathan, Mehmet Koyuturk, Christoph M. Hoffmann, Ananth Y. Grama

Department of Computer Science Technical Reports

No abstract provided.

Schedule (2005), Association Of Christians In The Mathematical Sciences

ACMS Conference Proceedings 2005

Fifteenth Conference of the Association of Christians in the Mathematical Sciences

Self-Similar Measures Associated To {Ifs} With Non-Uniform Contraction Ratios, Sze-Man Ngai, Yang Wang

Department of Mathematical Sciences Faculty Publications

In this paper we study the absolute continuity of self-similar measures defined by iterated function systems (IFS) whose contraction ratios are not uniform. We introduce a transversality condition for a multi-parameter family of IFS and study the absolute continuity of the corresponding self-similar measures. Our study is a natural extension of the study of Bernoulli convolutions by Solomyak, Peres, et al.

Role Of Near-Surface States In Ohmic-Schottky Conversion Of Au Contacts To Zno, H. L. Mosbacker, Y. M. Strzhemechny, B. D. White, P. E. Smith, David C. Look, D. C. Reynolds, C. W. Litton, L. J. Brillson

Physics Faculty Publications

A conversion from ohmic to rectifying behavior is observed for Au contacts on atomically ordered polar ZnO surfaces following remote, room-temperature oxygen plasma treatment. This transition is accompanied by reduction of the “green” deep level cathodoluminescence emission, suppression of the hydrogen donor-bound exciton photoluminescence and a ∼ 0.75 eV increase in n-type band bending observed via x-ray photoemission. These results demonstrate that the contact type conversion involves more than one mechanism, specifically, removal of the adsorbate-induced accumulation layer plus lowered tunneling due to reduction of near-surface donor density and defect-assisted hopping transport.

Catches Of Humpback Whales In The Southern Ocean, 1947-1973, Phil Clapham, Yuri Mikhalev, Wally Franklin, David Paton, Scott Baker, Robert L. Brownell Jr.

United States Department of Commerce: Staff Publications

We review catches of humpback whales (Megaptera novaeangliae) in the Southern Ocean during the period following World War II, with an emphasis on Areas IV, V and VI (the principal regions of illegal Soviet whaling on this species). Where possible, we summarize legal and illegal Soviet catches by year, Area and factory fleet, and also include information on takes by other nations. Soviet humpback catches between 1947 and 1973 totaled 48702 and break down as follows: 649 (Area I), 1412 (Area II), 921 (Area III), 8779 (Area IV), 22569 (Area V) and 7195 (Area VI), with 7177 catches not assignable …

Auto-Pipe: A Pipeline Design And Evaluation System, Mark A. Franklin, John Maschmeyer, Eric Tyson, James Buckley, Patrick Crowley

All Computer Science and Engineering Research

Auto-Pipe is a tool that aids in the design, evaluation, and implementation of pipelined applications that are distributed across a set of heterogeneous devices including multiple processors and FPGAs. It has been developed to meet the needs arising in the domains of communications, computation on large datasets, and real time streaming data applications. In this paper, the Auto-Pipe design flow is introduced and two sample applications, developed for compatibility with the Auto-Pipe system, are presented. The sample applications are the Triple-DES encryption standard and a subset of the signal-processing pipeline for VERITAS, a high-energy gamma-ray astrophysics experiment. These applications are …

Strain Induced Half-Metal To Semiconductor Transition In Gdn, Chun-Gang Duan, Renat F. Sabirianov, Jianjun Liu, Wai-Ning Mei, Peter A. Dowben, John R. Hardy

Physics Faculty Publications

We investigate the electronic structure and magnetic properties of GdN as a function of unit cell volume. Based on the first-principles calculations of GdN, we observe that there is a transformation in the conduction properties associated with the volume increase: first from half-metallic to semimetallic, then ultimately to semiconducting. We show that applying stress can alter the carrier concentration as well as mobility of the holes and electrons in the majority spin channel. In addition, we found that the exchange parameters depend strongly on lattice constant, thus the Curie temperature of this system can be enhanced by applying stress or …

Microgravity Studies Of Aggregation In Particulate Clouds, Todd B. Sauke, J. R. Marshall, J. N. Cuzzi

Todd B. Sauke

Aggregation in clouds of submillimeter quartz and volcanic ash particles was studied in microgravity. Particle clouds generated by pulses of air immediately formed electrostatic filamentary aggregates upon cessation of air turbulence. Manual agitation of experiment chambers produced cm-size loose grain clusters which voraciously scavenged free-floating material in their vicinity. A dipole model accounts for these observations. Experimental results have ramifications for the behavior of natural cloud systems and primary accretion of solids in the early solar nebula.

A Technological Model To Define Access To Electronic Clinical Records, A. Dalley, J. Fulcher, D. Bomba, K. Lynch, P. Feltham

Faculty of Informatics - Papers (Archive)

This communication describes a functioning model that permits access to an electronic health record across a small number of providers resident in an Australian regional setting. Design criteria designated that provider access rights were to be assignable, revokable, transportable, and informable.

Factoring Higher-Dimensional Shifts Of Finite Type Onto The Full Shift, Aimee S.A. Johnson, K. Madden

Mathematics & Statistics Faculty Works

A one-dimensional shift of finite type with entropy at least log factors onto the full -shift. The factor map is constructed by exploiting the fact that , or a subshift of , is conjugate to a shift of finite type in which every symbol can be followed by at least symbols. We will investigate analogous statements for higher-dimensional shifts of finite type. We will also show that for a certain class of mixing higher-dimensional shifts of finite type, sufficient entropy implies that is finitely equivalent to a shift of finite type that maps onto the full -shift.

Multivariate Analysis Of Ecologicai Data Using Canco, Anne M. Parkhurst

Department of Statistics: Faculty Publications

This book is about understanding and applying multivariate statistical methods useful for analyzing complex ecological problems. Researchers and students seeking to improve their ability to collect and analyze data from field observations and experiments, especially those interested in the response or variation of biotic communities to environmental conditions or experimental manipulation, will find this handbook helpful. The methods discussed are widely used in plant community ecology, as well as other areas in biology.

The book is tutorial in nature. The authors provide advice on how to best apply the multivariate statistical methods using the CANOCO for Windows, a licensed computer …

Large-Qt W-Boson Production At The Tevatron, Nikolaos Kidonakis, Agustín Sabio Vera

Faculty Articles

The production of W bosons at large transverse momentum at the Tevatron is dominated by soft-gluon corrections. In this talk we present a calculation of these corrections at next-to-next-to-leading order. The corrections enhance the transverse momentum distribution of the W while reducing the scale dependence.

Read More: http://www.worldscientific.com/doi/abs/10.1142/S0217751X05026236

Aquitard Effect On Drawdown In Water Table Aquifers, Vitaly A. Zlotnik, Hongbin Zhan

Department of Earth and Atmospheric Sciences: Faculty Publications

The effects of an aquitard on drawdown in an overlying unconfined aquifer can be represented by a drainage-type term at the aquitard-aquifer interface. The functional form of this boundary condition is similar to the Boulton-Neuman boundary condition used for water table aquifers except the kernel contains an inverse square root of time instead of a negative exponential. Type curves using the new boundary condition were obtained in semianalytical form. Examples for several representative conditions show that the effect of the underlying aquitard can contribute to the type curve at early and intermediate times, but the effect becomes negligible at late …

Illinois River 2004 Pollutant Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, L. Wade Cash, Keith Trost, Jennifer Purtle

Technical Reports

Automatic water sampler and a U. S. Geological Survey gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling by the Arkansas Water Resources Center -Water Quality Lab for January 1, 2004 to December 31, 2004.

Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washington County Road 76 Bridge On Ballard Creek, Marc A. Nelson, L. Wade Cash, G. Keith Trost, Jennifer Purtle

Technical Reports

The Illinois River Basin has experienced water quality impairment from non-point source pollution for many years. This fact was well documented in the State of Arkansas' Water Quality Assessment report, the Soil Conservation Service River Basin Study, and several University of Arkansas studies. Thirty-seven sub-watersheds have been identified by the SCS in the Arkansas portion of the Illinois River basin. In the Arkansas portion of the Basin, the Illinois River, Evansville Creek, Baron Fork, Cincinnati Creek, Muddy Fork, Moores Creek, Clear Creek, Osage Creek and Flint Creek were all classified as not supporting their designated use as primary contact recreation …

Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus At The Washington County Road 195 Bridge On The West Fork Of The White River, 2004 Annual Report, Marc A. Nelson, L. Wade Cash, G. Keith Trost, Jennifer Purtle

Technical Reports

A water quality sampling station was installed at the Washington County road 195 bridge on the West Fork of the White River just above the confluence of the three main forks of the Upper White River in December 2001. The Quality Assurance Project Plan (QAPP) was approved by EPA Region six on March 2002 and sampling was begun at that time. This station is coordinated with a USGS gauging station at the same location. This station was instrumented to collect samples at sufficient intervals across the hydrograph to accurately estimate the flux of total suspended solids, nitrogen and phosphorus into …

2004 Pollutant Loads Kings River Near Berryville, Arkansas, Marc A. Nelson, L. Wade Cash, Keith Trost, Jennifer Purtle

Technical Reports

An automatic sampler and a USGS gauging station were established in 1998 and water quality sampling was begun in 1999 on the Kings River near Berryville, Arkansas. Continuous stage and discharge measurements and frequent water quality sampling have been used to determine pollutant concentrations and loads in the river. This report presents the results from the sampling and analysis for January 1, 2004 to December 31, 2004.

Water Quality Sampling, Analysis And Annual Load Determinations For Tss, Nitrogen And Phosphorus In The Bayou Bartholomew At Garrett Bridge, Ar And Near Portland, Ar, Marc A. Nelson, L. Wade Cash, G. Keith Trost, Jennifer Purtle

Technical Reports

Water quality sampling stations were installed at the Bayou Bartholomew at Garrett Bridge, AR and near Portland, AR. These stations are coordinated with USGS gauging stations at the same locations. These stations are instrumented to collect samples at sufficient intervals across the hydrograph to accurately estimate the flux of total suspended solids, nitrogen and phosphorus in the River. Bayou Bartholomew watershed is about 1.08 million acres and is located in the south east corner of the state. The land use in the watershed is mostly in forest and cropland agriculture with some urban area. High turbidity levels and excessive silt …

Water Quality Sampling, Analysis And Annual Load Determinations For Nutrients And Sediment At The Arkansas Highway 45 Bridge On The White River Just Above Beaver Lake, Marc Nelson, L. Wade Cash, Keith Trost, Jennifer Purtle

Technical Reports

A water quality sampling station was installed at the Arkansas Highway 45 bridge on the White River just above Beaver Lake in 2002. This station is coordinated with a USGS gauging station at the same location. This station is instrumented to collect samples at sufficient intervals across the hydrograph to accurately estimate the flux of total suspended solids, nitrogen and phosphorus into the upper end of Beaver Lake from the White River. The West Fork of the White River is listed on Arkansas' 1998 303d list as impaired from sediment. The Upper White was designated as the states highest priority …

Model Choice In Time Series Studies Of Air Pollution And Mortality, Roger D. Peng, Francesca Dominici, Thomas A. Louis

Johns Hopkins University, Dept. of Biostatistics Working Papers

Multi-city time series studies of particulate matter (PM) and mortality and morbidity have provided evidence that daily variation in air pollution levels is associated with daily variation in mortality counts. These findings served as key epidemiological evidence for the recent review of the United States National Ambient Air Quality Standards (NAAQS) for PM. As a result, methodological issues concerning time series analysis of the relation between air pollution and health have attracted the attention of the scientific community and critics have raised concerns about the adequacy of current model formulations. Time series data on pollution and mortality are generally analyzed …

The Effects Of Water On The Physical Properties Of Silica Aerogels, Shira G. Mandel

Honors Theses

The research found in this report focuses on varying the amount of water used in the fabrication of silica aerogels and characterizing the effect this has on their physical properties, such as density, thermal conductivity and transmittance. So far, the aerogels made with the "original" recipe have produced average density of 0.09 g/cm3 and thermal conductivity of 0.04 W/mK; these properties are not significantly altered as the amount of water used is increased or decreased. However, there is an observable trend in transmittance; as more water is added to the "standard" recipe, the resulting monoliths become more transparent and less …

Automatically Discovering The Number Of Clusters In Web Page Datasets, Zhongmei Yao

Computer Science Faculty Publications

Clustering is well-suited for Web mining by automatically organizing Web pages into categories, each of which contains Web pages having similar contents. However, one problem in clustering is the lack of general methods to automatically determine the number of categories or clusters. For the Web domain in particular, currently there is no such method suitable for Web page clustering. In an attempt to address this problem, we discover a constant factor that characterizes the Web domain, based on which we propose a new method for automatically determining the number of clusters in Web page data sets. We discover that the …