Physical Sciences and Mathematics Commons^™

Nmr Investigations Of Natural Organic Matter In Forest Ecosystems, Chris E. Johnson

Civil and Environmental Engineering

No abstract provided.

The Classical Dirichlet Space, William T. Ross

Department of Math & Statistics Faculty Publications

In this survey paper, we will present a selection of results concerning the class of analytic functions f on the open unit disk D := {z ϵ C : │z│ < 1} which have finite Dirichlet integral.

Use Of Pen-Based Technology In Calculus Courses, John R. Hubbard

Department of Math & Statistics Faculty Publications

The author and his students used Tablet computers in Calculus I and Calculus II classes, providing students with dynamic digital transcripts that they could replay at their convenience. He and his students agreed that these graphic replays provide an effective alternative to the static explanations found in textbooks and in traditional course notes. Two specific examples are given in this paper.

Problem Solving In The Fourth Grade Classroom, Lisa Lefevre

Senior Honors Theses and Projects

No abstract provided.

Data Aggregation Techniques In Sensor Networks: A Survey, Ramesh Rajagopalan, Pramod K. Varshney

Electrical Engineering and Computer Science - All Scholarship

Wireless sensor networks consist of sensor nodes with sensing and communication capabilities. We focus on data aggregation problems in energy constrained sensor networks. The main goal of data aggregation algorithms is to gather and aggregate data in an energy efficient manner so that network lifetime is enhanced. In this paper, we present a survey of data aggregation algorithms in wireless sensor networks. We compare and contrast different algorithms on the basis of performance measures such as lifetime, latency and data accuracy. We conclude with possible future research directions.

A Key Predistribution Scheme For Sensor Networks Using Deployment Knowledge, Wenliang Du, Jing Deng, Yunghsiang S. Han, Pramod K. Varshney

Electrical Engineering and Computer Science - All Scholarship

To achieve security in wireless sensor networks, it is important to be able to encrypt messages sent among sensor nodes. Keys for encryption purposes must be agreed upon by communicating nodes. Due to resource constraints, achieving such key agreement in wireless sensor networks is non-trivial. Many key agreement schemes used in general networks, such as Diffie-Hellman and public-key based schemes, are not suitable for wireless sensor networks. Pre-distribution of secret keys for all pairs of nodes is not viable due to the large amount of memory used when the network size is large. Recently, a random key pre-distribution scheme and …

Comparisons Of K-Anonymization And Randomization Schemes Under Linking Attacks, Zhouxuan Teng, Wenliang Du

Electrical Engineering and Computer Science - All Scholarship

Recently K-anonymity has gained popularity as a privacy quantification against linking attacks, in which attackers try to identify a record with values of some identifying attributes. If attacks succeed, the identity of the record will be revealed and potential confidential information contained in other attributes of the record will be disclosed. Kanonymity counters this attack by requiring that each record must be indistinguishable from at least K − 1 other records with respect to the identifying attributes. Randomization can also be used for protection against linking attacks. In this paper, we compare the performance of K-anonymization and randomization schemes under …

Service Oriented Architecture For Voip Conferencing, Wenjun Wu, Geoffrey C. Fox, Hasan Bulut, Ahmet Uyar, Tao Huang

Electrical Engineering and Computer Science - All Scholarship

Voice/Video over IP (VoIP) systems to date have been either highly centralized or dependent on the IP multicast in nature. Global Multimedia Collaboration System is a scalable, integrated and service-oriented VoIP conferencing system, based on the XGSP collaboration framework and NaradaBrokering messaging middleware. This system can provide media and session services to heterogeneous endpoints such as H.323, SIP, Access Grid, RealPlayer as well as cellular phone. In this paper, we address the challenges of scalability, interoperablity and heterogeneity in massive VoIP conferencing system. We believe that our approach opens up new opportunities for leveraging classic VoIP systems by using new …

A Comparison Of Global Estimates Of Marine Primary Production From Ocean Color, Mary-Elena Carr, Marjorie A. M. Friedrichs, Marjorie Schmeltz, Maki Noguchi Aita, David Antoine, Kevin R. Arrigo, Ichio Asanuma, Oliver Aumont, Richard Barber, Michael Behrenfeld

CCPO Publications

The third primary production algorithm round robin (PPARR3) compares output from 24 models that estimate depth-integrated primary production from satellite measurements of ocean color, as well as seven general circulation models (GCMs) coupled with ecosystem or biogeochemical models. Here we compare the global primary production fields corresponding to eight months of 1998 and 1999 as estimated from common input fields of photosynthetically-available radiation (PAR), sea-surface temperature (SST), mixed-layer depth, and chlorophyll concentration. We also quantify the sensitivity of the ocean-color-based models to perturbations in their input variables. The pair-wise correlation between ocean-color models was used to cluster them into groups …

Transport Of Antarctic Krill (Euphausia Superba) Across The Scotia Sea. Part Ii: Krill Growth And Survival, Bettina A. Fach, Eileen E. Hofmann, Eugene J. Murphy

CCPO Publications

A time-dependent, size-structured, physiologically based krill growth model was used in conjunction with a circulation model to test the hypothesis that Antarctic krill (Euphausia superba) populations at South Georgia are sustained by import of individuals from upstream regions. Surface phytoplankton concentrations along the simulated drifter trajectories were extracted from historical Coastal Zone Color Scanner (CZCS) measurements and sea ice biota concentrations were calculated from sea ice concentration and extent extracted along drifter trajectories from Special Sensor Microwave/ Imager measurements. As additional food sources, a time series of heterotrophic food was constructed from historical data, and time series of …

Pelagic Functional Group Modeling: Progress, Challenges And Prospects, Raleigh R. Hood, Edward A. Laws, Robert A. Armstrong, Nicholas R. Bates, Christopher W. Brown, Craig A. Carlson, Fei Chai, Scott C. Doney, Paul G. Falkowski, Richard A. Feely, Marjorie A. M. Friedrichs

CCPO Publications

In this paper, we review the state of the art and major challenges in current efforts to incorporate biogeochemical functional groups into models that can be applied on basin-wide and global scales, with an emphasis on models that might ultimately be used to predict how biogeochemical cycles in the ocean will respond to global warming. We define the term "biogeochemical functional group" to refer to groups of organisms that mediate specific chemical reactions in the ocean. Thus, according to this definition, "functional groups" have no phylogenetic meaning-these are composed of many different species with common biogeochemical functions.

Substantial progress has …

Review Of Conservation: Linking, Ecology, Economics, And Culture By Monique Borgerhoff Mulder And Peter Coppolillo, David Himmelfarb

Ecological and Environmental Anthropology (University of Georgia)

Guided by their extensive field experience in conservation research and practice, Monique Borgerhoff Mulder and Peter Coppolillo offer an encompassing introduction to some of the most pervasive and incendiary social and biological science debates concerning biodiversity conservation. As environmental conservation initiatives have expanded throughout the globe in recent decades, scholars primarily from the social sciences have begun to critically examine the often fraught social dynamics of such conservation. This body of work has ignited a series of fierce debates among those with a concern for local peoples who have found themselves marginalized by conservation, those with a concern for rapidly …

A Message From The Editors, The Editors

Ecological and Environmental Anthropology (University of Georgia)

The complex nature of ecological and environmental problems requires a multi-faceted approach to their understanding and solution. Ecological and environmental anthropology sounds interdisciplinary, but what exactly does that mean? And how does that differ from multidisciplinary? Numerous articles over the past 30 or so years have talked about this type of research and some researchers have braved the unknown to produce high-quality, interesting, and useful work. However, for various institutional reasons, true integration of methods and theories across disciplines remains difficult to achieve.

Visual Ontology Modeling For Electronic Markets, Saartje Brockmans, Andreas Geyer-Schulz, Pascal Hitzler, Rudi Studer

Computer Science and Engineering Faculty Publications

The research program, Information Management and Market Engineering, focuses on the analysis and the design of electronic markets. Taking a holistic view of the conceptualization and realization of solutions, the research integrates the disciplines business administration, economics, computer science, and law. Topics of interest range from the implementation, quality assurance, and further development of electronic markets to their integration into business processes, innovative business models, and legal frameworks.

Formalizing Ontology Alignment And Its Operations With Category Theory, Antoine Zimmermann, Markus Krotzsch, Jerome Euzenat, Pascal Hitzler

Computer Science and Engineering Faculty Publications

An ontology alignment is the expression of relations between different ontologies. In order to view alignments independently from the language expressing ontologies and from the techniques used for finding the alignments, we use a category-theoretical model in which ontologies are the objects. We introduce a categorical structure, called V-alignment, made of a pair of morphisms with a common domain having the ontologies as codomain. This structure serves to design an algebra that describes formally what are ontology merging, alignment composition, union and intersection using categorical constructions. This enables combining alignments of various provenance. Although the desirable properties of this algebra …

Preparation Of Some Substituted Terephthalic Acids, Susanna Branion, Vladimir Benin

Chemistry Faculty Publications

We report in detail the preparation of two substituted terephthalic acids: 2‐sulfomethylterephthalic acid (1) and 2‐phosphonoterephthalic acid (2). Efficient, short syntheses have been developed for both compounds. They are potentially useful monomers for construction of acid‐pendant polymer chains.

Preparation, Characterization And Dft Studies Of Some New N-Nitrosocarbamates And N-Nitrosoureas, Ragavan Narayanan, Helene Hedian, Eric Shamo, Vladimir Benin

Chemistry Faculty Publications

We are presenting the preparation, characterization and density functional theory (DFT) studies {B3LYP/6-31+G(d)) of several reiated classes of N-nitrosocarbamates and N-nitrosoureas. The iong-range goal is the design and preparation of compounds, which would undergo photochemical or hydrolytic decomposition, to yield stabilized cyclic cations that can serve as alkylating agents at various nucleophilic centers, including DNA bases.

A Qualitative Analysis On Nonconstant Graininess Of The Adaptive Grids Via Time Scales, Paul W. Eloe, Stefan Hilger, Qin Sheng

Mathematics Faculty Publications

Calculus on time scales plays a crucial role in unifying the continuous and discrete calculus. In this paper, we apply the time scales calculus methods to study qualitatively properties of the numerical solution of second order ordinary differential equations via different finite difference schemes. The properties become particularly interesting in the case when the computational grids are nonuniform, on which the finite difference operators do not commute. To investigate the solution properties, we introduce the graininess function, and express the numerical solution as functions of the variable grid steps, that is, functions of the graininess and its dynamic derivatives implemented …

2006 Alumni Presenters, University Of Dayton. Department Of Mathematics

Biennial Alumni Seminar

No abstract provided.

Adaptive Beam Director For A Tiled Fiber Array, Mikhail Vorontsov, Jim F. Riker, Ernst Polnau, Svetlana Lachinova, Venkata S. Rao Gudimetla

Electrical and Computer Engineering Faculty Publications

We present the concept development of a novel atmospheric compensation system based on adaptive tiled fiber array architecture operating with target-in-the-loop scenarios for directed beam applications. The adaptive tiled fiber array system is integrated with adaptive beam director (ABD). Wavefront control and sensing functions are performed directly on the beam director telescope primary mirror. The beam control of the adaptive tiled fiber array aims to compensate atmospheric turbulence-induced dynamic phase aberrations and results in a corresponding brightness increase on the illuminated extended object. The system is specifically designed for tiled fiber system architectures operating in strong intensity scintillation and speckle-modulation …

2006 (Winter), University Of Dayton. Department Of Mathematics

Colloquia

Abstracts of the talks given at the 2006 Winter Colloquium.

Assessing Water-Supply Potential Of Abandoned Underground Coal Mines In Eastern Kentucky, James S. Dinger, Dennis H. Cumbie, Bart Davidson

Report of Investigations--KGS

Use of water in abandoned underground coal mines for municipal, industrial, agricultural, or domestic water supplies is dependent upon the water quantity and quality. For either of these factors, the requirements of the user will play a role in what water quantity or quality is acceptable. This report provides analysis of field-derived water-quality and -quantity characteristics for six abandoned underground coal mines in the Eastern Kentucky Coal Field. In addition, some ancillary data from State regulatory agencies were used to help characterize water quality coming from the mines.

This study demonstrates that water quality in abandoned deep mines can be …

Source Scaling, Subevent Distributions, And Ground-Motion Simulation In The Composite Source Model, Baoping Shi, Zhenming Wang, Edward W. Woolery

Report of Investigations--KGS

Predicting strong ground motion from a large earthquake depends to a large extent on the development of a realistic source model. Strong ground motion was simulated using the composite source model. F0or comparison purposes, two different approaches were implemented in the source procedure simulation. For the first approach, the source was taken as a superposition of circular subevents with a constant stress drop. The number of subevents and their radii followed fractal law distribution, specified as a spatial random field, and subevents were allowed to overlap. This resulted in the total area of the subevents being much greater than the …

Stratigraphic Column Of The Kope And Fairview Formations, Kentucky 445, Brent, Kentucky, Steven M. Holland, Arnold I. Miller, David L. Meyer, Benjamin F. Dattilo, Sharon C. St. Louis Diekmeyer

Map and Chart--KGS

The Upper Ordovician Kope Formation is exposed over a broad area of southwestern Ohio, southeastern Indiana, and northern Kentucky (Weir and others, 1984). Roadcuts along Ky. 445 near Brent (Figs. 2-3) and adjacent roadcuts along Interstate 275 expose a nearly complete section of the Kope Formation as well as the overlying Fairview Formation.

Generalized Geologic Map For Land-Use Planning: Boyle County, Kentucky, Daniel I. Carey, Bart Davidson, Katie Russell

Map and Chart--KGS

This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock.

Current Challenges In Autonomous Vehicle Development, Julianna Connelly Stockton, W. S. Hong, R. B. Mahoney, D. A. Sparrow

Mathematics Faculty Publications

The field of autonomous vehicles is a rapidly growing one, with significant interest from both government and industry sectors. Autonomous vehicles represent the intersection of artificial intelligence (AI) and robotics, combining decision-making with real-time control. Autonomous vehicles are desired for use in search and rescue, urban reconnaissance, mine detonation, supply convoys, and more. The general adage is to use robots for anything dull, dirty, dangerous or dumb. While a great deal of research has been done on autonomous systems, there are only a handful of fielded examples incorporating machine autonomy beyond the level of teleoperation, especially in outdoor/complex environments. In …

Bridging The Digital Divide In Public Participation: The Roles Ofinfrastructure, Hardware, Software And Social Networks In Helsinki’S Arabianranta Andmaunula, C. J. Gabbe

Environmental Studies and Sciences

Information and communications technology (ICT) itself does not provide communities with a more effective voice in the planning process. However, when ICT is used as a tool to build stronger neighborhood social networks, it can catalyze public participation in planning. The use of ICT as a community-building tool requires a combination of network infrastructure, hardware and software, according to the literature. Additionally, it requires the utilization of human social networks. Based on my study of Helsinki’s Arabianranta and Maunula neighborhoods, I found that catalyzing collaborative planning in Helsinki using ICT requires a combination of infrastructure, hardware, software, and, most importantly, …

Santa Clara Magazine, Volume 48 Number 3, Winter 2006, Santa Clara University

Santa Clara Magazine

8 - WELCOME HOME, STEVE By Steven Boyd Saum. Basketball superstar Steve Nash '96 comes home to Santa Clara for a unique honor: a ceremony retiring his Bronco jersey. In a convocation address, he tells how Santa Clara changed his life. Now he wants the University to take its mission global.

12 - THE SCHOOL OF HOPE By Martha Ellen Stortz. Scholar and teacher Bill Spohn earned deep affection and the respect of the Santa Clara community in his years directing the Bannan Center for Jesuit Education. When he was stricken with cancer, he and his wife, Marty Stortz, looked …

Microsoft .Net And Security Provided By High -Level Internet Protocols, Tatiana Melnik

All Volumes (2001-2008)

This paper describes a class of insecure .NET client applications, which avoid higher layer protocol protection through using a “raw” send and receive API. The .NET Framework rests on many other Microsoft components, including the Windows Driver Model (WDM). This model supports four driver types, two of which were considered in this paper: protocol and miniport drivers. By compiling and executing client applications using the “raw” sockets interface, we demonstrate that insecure clients can be written with minimal programming effort (lines of code).

A Database Of Local Fields, John W. Jones, David P. Roberts

Mathematics Publications

We describe our online database of finite extensions of Q_p, and how it can be used to facilitate local analysis of number fields.