Digital Commons Network^™

Temperature Dependence Of The Double Layer Capacitance For The Restricted Primitive Model Of An Electrolyte Solution From A Density Functional Approach, Douglas Henderson, J. Reszko-Zygmunt, Stefan Sokolowski, Dezso Boda

Faculty Publications

We apply a different version of the density functional theory, given by Pizio, Patrykiejew, and Sokolowski [J. Chem. Phys. 121, 11957 (2004)], for a nonuniform restricted primitive model of an electrolyte solution to evaluate the temperature dependence of the capacitance of an electric double layer. We show that this theory is capable of reproducing the computer simulation data at a quantitative level. In particular, the reversal of the temperature dependence of the capacitance at low temperatures is predicted. This phenomenon has been difficult to predict from theory. Further, this theory also leads to an accurate description of the double layer …

Fast And Robust Incremental Action Prediction For Interactive Agents, Jonathan Dinerstein, Parris K. Egbert, Dan A. Ventura

Faculty Publications

The ability for a given agent to adapt on-line to better interact with another agent is a difficult and important problem. This problem becomes even more difficult when the agent to interact with is a human, since humans learn quickly and behave non-deterministically. In this paper we present a novel method whereby an agent can incrementally learn to predict the actions of another agent (even a human), and thereby can learn to better interact with that agent. We take a case-based approach, where the behavior of the other agent is learned in the form of state-action pairs. We generalize these …

Graphs Whose Minimal Rank Is Two: The Finite Fields Case, Wayne Barrett, Hein Van Der Holst, Raphael Loewy

Faculty Publications

Let F be a finite field, G = (V,E) be an undirected graph on n vertices, and let S(F,G) be the set of all symmetric n × n matrices over F whose nonzero off-diagonal entries occur in exactly the positions corresponding to the edges of G. Let mr(F,G) be the minimum rank of all matrices in S(F,G). If F is a finite field with p^t elements, p does not = 2, it is shown that mr(F,G) ≤ 2 if and only if the complement of G is the join of a complete graph with either the union of at most …

Microwave Backscatter Modeling Of Erg Surfaces In The Sahara Desert, David G. Long, Haroon Stephen

Faculty Publications

The Sahara desert includes large expanses of sand dunes called ergs. These dunes are formed and constantly reshaped by prevailing winds. Previous study shows that Saharan ergs exhibit significant radar backscatter (σ˚) modulation with azimuth angle (∅). We use σ˚ measurements observed at various incidence angles and ∅ from the NASA Scatterometer (NSCAT), the SeaWinds scatterometer, the ERS scatterometer (ESCAT), and the Tropical Rainfall Measuring Mission's Precipitation Radar to model the σ˚ response from sand dunes. Observations reveal a characteristic relationship between the backscatter modulation and the dune type, i.e., the number and orientation of the dune slopes. Sand dunes …

A Framework For Extraction Plans And Heuristics In An Ontology-Based Data-Extraction System, Alan E. Wessman

Theses and Dissertations

Extraction of information from semi-structured or unstructured documents, such as Web pages, is a useful yet complex task. Research has demonstrated that ontologies may be used to achieve a high degree of accuracy in data extraction while maintaining resiliency in the face of document changes. Ontologies do not, however, diminish the complexity of a data-extraction system. As research in the field progresses, the need for a modular data-extraction system that de-couples the various functional processes involved continues to grow.

In this thesis we propose a framework for such a system. The nature of the framework allows new algorithms and ideas …

Java Performance Of The Rijndael Encryption Algorithm Across Compilers And Virtual Machines, Gregory Leavitt Orgill

Theses and Dissertations

The Rijndael encryption algorithm has recently been published as the Advanced Encryption Standard (AES), a Federal Information Processing Standard, and is being accepted by developers and designers as the algorithm of choice where encryption is required. Java is becoming the language of choice for E-Business applications, many of which require cryptography. The performance of any Java application is dependent on the compiler and virtual machine used to compile and interpret. Prior research has provided performance information for the Rijndael algorithm in Java for specific virtual machines. This research includes the development of a Rijndael implementation in Java. Using Java system …

Computer-Simulation-Assisted Lean Manufacturing Training, Luoding Wang

Theses and Dissertations

This thesis assesses the potential of using computer simulation to aid existing lean manufacturing training methods such as lecture and live simulation. An investigation of this possibility was carried out in conjunction with UMEP's Lean 101 class. In the study, two experimental computer simulation models demonstrating the push and pull production scenarios were constructed using ProModel software. Simulation models were equipped with a Visual Basic interface to aid trainees to manipulate the model via ActiveX. Constructed computer simulation was compared with live simulation to answer these research questions: 1. Was computer simulation able to teach additional lean concepts not covered …

Dynamic Reconfigurable Machine Tool Controller, Wei Li

Theses and Dissertations

This dissertation presents a dynamic reconfigurable control strategy based on the Direct Machining And Control (DMAC) research at Brigham Young University. A reconfigurable framework is proposed which will allow a machine tool to be controlled by a variety of applications and control laws. This Reconfigurable Mechanism for Application Control (RMAC) paradigm uses a hierarchical architecture to configure a mechanism into a device driver for direct control by an application like CAD/CAM. The RMAC paradigm is one of a mechanism device driver assigned to each mechanism class or model, and uses only the master model to control the mechanism. The traditional …

Evaluation Of Land Development Impact On A Tropical Watershed Hydrology Using Remote Sensing And Gis

Journal of Spatial Hydrology

Understanding how the land use change influence the river basin hydrology will enable planners to formulate policies to minimize the undesirable effects of future land use changes. Land cover changes increase impervious ground surfaces, decrease infiltration rate and increase runoff rate, hence causing low base flow during the dry seasons. Efficient tools such as satellite remote sensing and Geographic Information System (GIS) are currently being used to manage the limited water resources. The need for spatial and temporal land-cover change detection at a larger scale makes satellite imagery the most cost effective, efficient and reliable source of data. The ability …

Review Essay: Rodney Stark’S Vision Of Medieval Christianity, Elspeth Whitney

Quidditas

Rodney Stark. For the Glory of God: How Monotheism Led to Reformations, Science, Witch-Hunts, and the End of Slavery. Princeton and Oxford: Princeton University Press, 2003, 504 pages, and The Victory of Reason: How Christianity Led to Freedom, Capitalism, and Western Success. New York: Random House, 2005, 304 pages.

Science, Pseudoscience, And Religious Belief, Allen R. Buskirk

Review of Books on the Book of Mormon 1989–2011

Review of Carl Sagan. The Demon-Haunted World: Science as a Candle in the Dark.

About The Contributors, Farms Review

Review of Books on the Book of Mormon 1989–2011

No abstract provided.

Model The Effect Of Four Artificial Recharge Dams On The Quality Of Groundwater Using Geostatistical Methods In Gis Environment, Oman

Journal of Spatial Hydrology

The geostatistical techniques of GPI, IDW and Kriging were applied in order to evaluate the use of these statistical approaches in GIS environment to examine artificial recharge dams and its effect on the quality of groundwater. Quantitative models were employed to investigate one aspect of the artificial dam’s role on improving the shallow groundwater quality.

The TDS was taken as the chemical parameter to validate the applicability of the geostatistical models in the four dams. The decrease of salinity of groundwater along the subsurface flow path away from the dams toward the coast, in all the prepared interpolated maps is …

Joseph Smith And The Problem Of The Unevangelized, David L. Paulsen, Brent Alvord

Review of Books on the Book of Mormon 1989–2011

Review of John Sanders. No Other Name: An Investigation into the Destiny of the Unevangelized. and Review of Gabriel Fackre, Ronald H. Nash, and John Sanders. What about Those Who Have Never Heard? Three Views on the Destiny of the Unevangelized.

The Message Of The Joseph Smith Papyri: An Egyptian Endowment, Hugh Nibley

Maxwell Institute Publications

When Hugh Nibley first wrote The Message of the Joseph Smith Papyri, he wrote it for an audience that understood things both Egyptian and Latter-day Saint. It was an audience that at the time did not exist. For the bemused audience that did find the book, many failed to comprehend it. Many of Nibley's readers have supposed that, like Nibley's other works, it was designed to be read straight through and have expressed frustration at the difficulty of doing so. Only the first few chapters are designed to be read in this manner. The rest of the book is …

Autonomous Vehicle Technologies For Small Fixed-Wing Uavs, Randal Beard, Derek Kingston, Morgan Quigley, Deryl Snyder, Reed Christiansen, Walt Johnson, Timothy Mclain, Michael A. Goodrich

Faculty Publications

The objective of this paper is to describe the design and implementation of a small semi-autonomous fixed-wing unmanned air vehicle. In particular we describe the hardware and software architectures used in the design. We also describe a low weight, low cost autopilot developed at Brigham Young University and the algorithms associated with the autopilot. Novel PDA and voice interfaces to the UAV are described. In addition, we overview our approach to real-time path planning, trajectory generation, and trajectory tracking. The paper is augmented with movie files that demonstrate the functionality of the UAV and its control software.

Spatial Distribution Of Land Type In Regression Models Of Pollutant Loading

Journal of Spatial Hydrology

This paper proposes a method to improve landscape-pollution interaction regression models through the inclusion of a variable that describes the spatial distribution of a land type with respect to the pattern of runoff within a drainage catchment. The proposed index is used as an independent variable to enhance the strength, as quantified by R² values, of regression relationships between empirical observations of in-stream pollutant concentrations and land type by considering the spatial distribution of key land-type categories within the sample point’s drainage area. We present an index that adds a new dimension of explanatory power when used in conjunction …

Dependability Auditing With Model Checking, Bonnie Anderson, James Hansen, Paul Benjamin Lowry

Faculty Publications

Model checking offers a methodology for determining whether a model satisfies a list of correctness requirements. We propose a theory of dependability auditing with model checking based on four principles: (1) The modeling process should be partitioned into computational components and behavioral components as an aid to system understanding; (2) The complex system will be abstracted to create a model; (3) A language must be available that can represent and evaluate states and processes that evolve over time; (4) Given an adequate model and temporal specifications, a model checker can verify whether or not the input model is a model …

Network Model For Mimo Systems With Coupled Antennas And Noisy Amplifiers, Michael A. Jensen, Matthew L. Morris

Faculty Publications

This work presents a framework for the analysis of mutually-coupled antennas in a multiple-input multiple-output system. The approach uses network theory to formulate the transfer matrix relating the signals input to the transmit antennas to the signals at the output of the receiver front end. This transfer function includes the coupled transmit and receive antennas, the multipath propagation channel, the receiver matching network, and a realistic noise model for the receive amplifiers. Application of the formulation to coupled dipole antennas characterized using full-wave electromagnetic analysis illustrates the performance gains possible from matching the coupled antenna/receive amplifier subsystem for minimum noise …

Exchanging Identities, James R. Allison

Faculty Publications

In many societies, economic activities are an important means through which individuals create their social identity. This is particularly evident in, for example, some Melanesian societies where successful participation in exchange systems is an important determinant of an individual‘s social status. These processes are difficult to see in the ethnographic or prehistoric Southwest, where status differences are understated, but some principles apply cross-culturally. This paper focuses on ethnographic examples showing how differential participation in institutionalized, inter-community exchange systems affects the negotiation of identity within communities. Examples from the prehistoric Puebloan Southwest are then examined in light of the ethnographic insights.

Life On A Tricycle A Case Study Of Language Impairment From 4 To 19, Lee Robinson, Bonnie Brinton, Martin Fujiki

Faculty Publications

This article presents a longitudinal case study of a child named Cody identified with specific language impairment. Cody was followed from 4 to 19 years of age, at which time he compared his social skills with those of peers: “It’s like they’re driving sports car and I’m on a tricycle.” His initial long- and short-term intervention goals are presented, along with the treatment methods employed and the resulting outcomes. Although long-term goals remained consistent, as the nature of Cody’s academic, social, and emotional challenges shifted, it was necessary to gear treatment to address his changing needs. Cody’s case illustrates the …

Coordination Variables, Coordination Functions, And Cooperative Timing Missions, Randal Beard, Timothy W. Mclain

Faculty Publications

Sponsorship: AFOSR, DARPA. This paper presents a solution strategy for achieving cooperative timing among teams of vehicles. Based on the notion of coordination variables and coordination functions, the strategy facilitates cooperative timing by requiring acceptably low levels of communication and computation. The application of the coordination variable/function approach to trajectory planning problems for teams of unmanned air vehicles with timing constraints is described. Three types of timing constraints are considered: simultaneous arrival, tight sequencing, and loose sequencing. Simulation results demonstrating the viability of the approach are presented.

The Danish Interest Conference, Thorvald Hansen

The Bridge

On January 1, 1963 The American Evangelical Lutheran Church ceased to exist as a separate entity. The AELC was the new name that had been assumed by the Danish Evangelical Lutheran Church in America in 1954. Therefore, what really came to an end in 1963 was the Danish Evangelical Lutheran Church, which hereinafter shall be referred to simply as the Danish Church.

Reviews

The Bridge

No abstract provided.

Efficient Capacity-Based Antenna Selection For Mimo Systems, Michael A. Jensen, Matthew L. Morris

Faculty Publications

The achieved capacity of the multiple-input-multiple-output wireless channel is typically dependent on the array configurations at the transmitter and receiver. Maximizing system capacity or throughput therefore requires that the arrays adapt to changing channel conditions, which may be accomplished by selecting an appropriate subset of available antenna elements for connection to the electronic transmit and receive modules. This work presents algorithms, derived using relatively straightforward information theoretic considerations, for efficiently and effectively selecting the antenna elements. Computational examples using a realistic channel model for indoor environments illustrate the performance of the techniques.

Performances Of Stochastic Approaches In Generating Low Streamflow Data For Drought Analysis

Journal of Spatial Hydrology

This study analyzed the monthly-minimum daily discharge data of each month from three gauge stations on Cekerek Stream for forecasting using stochastic approaches. Initially non- parametric test (Mann-Kendall) was used to identify the trend during study period. The two approaches of stochastic modeling, ARIMA and Thomas-Fiering models, were used to simulate the monthly-minimum daily discharge data of each month. The error estimates (RMSE and MAE) of forecasts from both approaches were compared to identify the most suitable approach for reliable forecast. The two error estimates calculated for two approaches indicate that ARIMA model appear to be slightly better than Thomas-Fiering. …

Building Zion: The Latter-Day Saint Legacy Of Urban Planning, Craig D. Galli

BYU Studies

As with the founding of Plymouth Colony, distinctive historical circumstances and theological beliefs converged to motivate early Latter-day Saint community builders. While the historic roots of Salt Lake City are well known to virtually every grade school student in Utah and to Church members around the world, aspects of our remarkable legacy of urban and transportation planning remain obscure. The physical design and community values underlying early attempts to build Zion provide useful perspective and inspiration as today's community leaders now grapple with managing urban growth along Utah's Wasatch Front (from Brigham City to Nephi and Grantsville to Kamas) and …

Articulation: Challenges And Solutions, Martha G. Abbott

Russian Language Journal

Providing students with a seamless progression of language development within the K-12 school curriculum remains a challenge for the foreign-language profession as we enter the new century. As national standards are developed for foreign-language education in the K-12 continuum and school districts throughout the country consider implementing foreign-language programs earlier in the curriculum, we have an opportunity to confront that challenge with renewed vigor.

Hans Jorgen Pedersen: The Founder Of Danebod, Thorvald Hansen

The Bridge

He served as pastor in a number of congregations. He was president of three Folk Schools, two of which he founded. He was a good businessman and was able to finance some of his undertakings. Yet he seemed never to stay at any one thing for very long. He easily became discouraged and he seems to have been that type of person for whom the grass is always greener somewhere else. Nonetheless, in the thirty years of his activity in America, Hans Jorgen Pedersen made a significant contribution to the life of the Danish Lutheran Church among the immigrants.

From The Farm To The Faculty: The Educational Odyssey Of Paulus Falck, Johan Windmuller

The Bridge

During the last quarter of the nineteenth century, thousands of immigrants from Denmark settled in the American Midwest. Some of them brought with them educational concepts and religious convictions they hoped to pass on to future generations; to do so they created a variety of educational and religious institutions scattered across several Midwestern states. What follows is a study of Paulus Falck, who passed through several of these institutions.