Digital Commons Network^™

Expanding The Study And Understanding Of Psychological Control, Brian K. Barber, Roy A. Bean, Lance D. Erickson

Faculty Publications

The two central purposes of this volume are to review the historical, conceptual, and empirical literatures on parental psychological control and to advance the rapidly growing scientific literature Ono this aspect of the parent-child relationship. Chapter 2 addressed the first task with a review of published material that has specifically investigated psychological control or variables that are conceptually similar to it. From this review of the historical conceptualizations of parental psychological control, we concluded that psychological control is a psychologically oriented, intrusive, constraining, and manipulating form of parental control in which parents appear to maintain their own psychological status at …

On-Road Remote Sensing Of Automobile Emissions In The Denver Area: Year 3, Sajal S. Pokharel, Gary A. Bishop, Donald H. Stedman

Fuel Efficiency Automobile Test Publications

No abstract provided.

2002 : Part - Time Courses, Dublin Institute Of Technology

DIT Publications

Book containing information and full list of part - time courses for 2002 entry.

2002/2003 academic calendar.

Faculty structure and key contacts at DIT.

The Development Of A Methodology For Creating An Earthen Building Inventory, Margaret Lyn Ford

School of Art, Design and Architecture Theses

This thesis addresses the issue of cataloguing traditional earthen architecture. It proposes a methodology that will permit the systematic collection and analysis of objective and quantifiable data relating to historic earthen, or cob, buildings in a parish in mid Devon. The brief given for this project requhes a multi-disciplinary approach to be taken, one that considers the topographical surroundings and the historic context of the buildings as well as the architectural characteristics. A triangular concept is expounded, with the three elements providing a sound basis for the development of an holistic methodology for creating an earthen building inventory. To comply …

The Benefit Of Code Switching Within A Bilingual Education Program, Susan Pollard '02

Honors Projects

In this study, I explore the effects oftwo types of education (bilingual and immersion) on Spanish dominant students in two cities in the U.S. Specifically, I examine the role of codeswitching (the use of both Spanish and English within the same discourse) in bilingual and immersion settings. I explore the effects of code switching on bilingual students and whether subject matter can be discussed more effectively in classrooms where code-switching is allowed and encouraged due to the language freedom it provides.

Representations Of Motherhood: A Feminist Criticism Of Indian Post-Colonial Novels, Baishakhi Banerjee

Dissertations and Theses @ UNI

No abstract provided.

Misinformation [1], Hollis P. Leighly

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Evaluating And Monitoring Nucleation And Growth In Copper Foil, Ye Kun Lee, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

The electrodeposition of copper foil for use in electronic materials applications is a complex and demanding process. The specific aspects of producing and controlling the structure-property-performance requirements of the foil are important because of the stringent demands placed on their use in printed circuit boards and similar products. In this paper, a brief review of the electrodeposition process for raw copper foil is presented. Since electrolyte additives play such a significant role in the copper-deposition process, the effects of two essential additives, chloride ion and an organic (e.g., glue or gelatine), on the foil are described. Also, the influence of …

Quantum Gravitational Corrections To Black Hole Geometries, Marco Cavaglia, A. Fabbri

Physics Faculty Research & Creative Works

We calculate perturbative quantum gravity corrections to eternal two-dimensional black holes. We estimate the leading corrections to the AdS₂ black hole entropy and determine the quantum modification of N-dimensional Schwarzschild spacetime.

A New Method For Suboptimal Control Of A Class Of Nonlinear Systems, Ming Xin, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In this paper, a new nonlinear control synthesis technique (θ - D approximation) is presented. This approach achieves suboptimal solutions to nonlinear optimal control problems in the sense that it solves the Hamilton-Jacobi-Bellman (HJB) equation approximately by adding perturbations to the cost function. By manipulating the perturbation terms both semi-globally asymptotic stability and suboptimality properties can be obtained. The convergence and stability proofs are given. This method overcomes the large control for large initial states problem that occurs in some other Taylor expansion based methods. It does not need time-consuming online computations like the state dependent Riccati equation (SDRE) technique. …

Experimental Implementation Of Adaptive-Critic Based Infinite Time Optimal Neurocontrol For A Heat Diffusion System, Prashant Prabhat, S. N. Balakrishnan, Dwight C. Look

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Recently the synthesis methodology for the infinite time optimal neuro-controllers for PDE systems in the framework of adaptive-critic design has been developed. In this paper, first we model an experimental setup representing one dimensional heat diffusion problems. Then we synthesize and implement an adaptive-critic based neuro-controller for online temperature profile control of the experimental setup.

Proper Orthogonal Decomposition Based Feedback Optimal Control Synthesis Of Distributed Parameter Systems Using Neural Networks, Radhakant Padhi, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A new method for optimal control design of distributed parameter systems is presented in this paper. The concept of proper orthogonal decomposition is used for the model reduction of distributed parameter systems to form a reduced order lumped parameter problem. The optimal control problem is then solved in the time domain, in a state feedback sense, following the philosophy of ''adaptive critic'' neural networks. The control solution is then mapped back to the spatial domain using the same basis functions. Numerical simulation results are presented for a linear and nonlinear one-dimensional heat equation problem in an infinite time regulator framework.

Piagetian Developmental Reasoning Levels Of High School Students In Differentiated First Year Chemistry Courses, Pamela Kay Brewer-Michael

Dissertations and Theses @ UNI

This research studied the developmental reasoning levels of students in three different first year high school chemistry courses as related to achievement defined by cumulative grade point average and course selection. The Lawson Test of Formal Operations modified by Roy Unruh and Bruce Perry at the University of Northern Iowa was used to determine cognitive developmental level of subjects. A consumer type chemistry course, a traditional high school chemistry course, and an honors course under consideration with Marshalltown Community College for credit status were the three courses utilized in this study. Data was collected in a classroom group setting over …

A Christian Parent’S Guide To Harry Potter And The Sorcerer’S Stone, Gina Louise Burkart

Dissertations and Theses @ UNI

A Christian Parent's Guide to Harry Potter and the Sorcerer's Stone provides parents with a variety of activities and opportunities for discussing Harry Potter and the Sorcerer's Stone through the Christian lens. The guide is founded and supported by educational theorists such as Kohlberg and Piaget and is built on the principle that parents can help their children sort out fantasy and reality and moral issues by discussing literature with their children. Each chapter is broken down into four sections: Bridging the Gap, Talking About It at Home, Scripture Connection, and Activities. Bridging the Gap allows parents and children to …

Atomic And Molecular Electron Affinities: Photoelectron Experiments And Theoretical Computations, Jonathan C. Rienstra-Kiracofe, Gregory S. Tschumper, Henry F. Schaefer, Sreela Nandi, G. Barney Ellison

Chemistry Faculty Research & Creative Works

A review is given of the experimental determination of electron affinities (EAs). Also considered is the ability of computational chemistry methods to predict electron affinities. The development and present status of computational chemistry techniques for the prediction of atomic molecular EAs is also reviewed in a historical context. Through comparisons to experimental EAs and results from other theoretical methods, analysis of DFT EAs is given. In the context of other theoretical methods, the successes and failures of DFT EA predictions are detailed.

The Changing Roles Of Analog And Digital Signal Processing In Cmos Image Sensors, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

Throughout the years digital signal processing has been encroaching more and more into what had previously been exclusive analog circuit domains. Here we briefly summarize various lines of research in CMOS imaging sensoring technology paying special attention to the gradual transition from analog to digital processing. The transition from continuous-time continuous-value pixels to digital (discrete-time binary-value) pixels could be viewed as the natural final step in the evolution of these imaging circuits in order to achieve wide dynamic range with acceptable signal to noise ratio. After data is read off a digital pixel imager chip, digital signal processing is required …

Increased Mfcc Filter Bandwidth For Noise-Robust Phoneme Recognition, Mark D. Skowronski, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

Many speech recognition systems use mel-frequency cepstral coefficient (MFCC) feature extraction as a front end. In the algorithm, a speech spectrum passes through a filter bank of mel-spaced triangular filters, and the filter output energies are log-compressed and transformed to the cepstral domain by the DCT. The spacing of filter bank center frequencies mimics the known warped-frequency characteristics of the human auditory system, yet the bandwidths of these filters are not chosen through biological inspiration. Instead, they are set by aligning endpoints of the triangle, which is itself an arbitrary shape. It is surprising that for such a popular speech …

A New Optimal Nonlinear Control Method And Its Application To Missile Guidance Law Design, Ming Xin, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In this paper, a new nonlinear control synthesis technique (q-D approximation) is discussed. By adding perturbations to the cost function this approach achieves a suboptimal solution to the Hamilton-Jacobi- Bellman (HJB) equation. By manipulating the perturbation terms both asymptotic stability and optimality properties are obtained. An application to the design of missile guidance law is presented and is compared with a similar technique (State Dependent Riccati Equation technique) used in problems of this class. © 2002 by the author(s).

Accuracy And Efficiency In Fem Modeling Of Turbofan Acoustic Radiation, Eivind Listerud, Walter Eversman

Mechanical and Aerospace Engineering Faculty Research & Creative Works

It is shown that there is an increase in efficiency of acoustic radiation finite element modeling with the incorporation of cubic rather than quadratic serendipity elements. Cubic serendipity elements produce a given level of accuracy for acoustic pressure using a coarser mesh than required using quadratic elements, thus decreasing the CPU time needed for accurate modeling. These elements have been applied to the near field inlet and aft acoustic radiation models for a turbofan engine with the result of considerable reduction in the dimensionality of the problem without sacrificing accuracy. Visual observations of the gain in computational efficiency is supported …

End To End Congestion Control In High-Speed Networks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes an adaptive methodology to prevent congestion in packet switched networks such as the Internet, where the internal network nodes convey very little information to the ingress nodes. Two architectures of preventing the congestion are presented: the first one when the traffic arrival rates, and bottleneck queue levels are known and the other when these are unknown. In the latter, the network traffic is estimated online using an adaptive system by measuring the buffer occupancy. In both architectures, the congestion is controlled by adjusting the transmission rates of non real-time and certain real-time sources in response to the …

Distributed Power Control In Wireless Communication Systems, Sarangapani Jagannathan, A. T. Chronopoulos, S. Ponipireddy

Electrical and Computer Engineering Faculty Research & Creative Works

Energy efficiency is a measure of performance in wireless networks. Therefore, controlling the transmitter power at a given node increases not only battery operating life, but also overall system capacity by successfully admitting new links. It is essential to find effective means of power control in point-to-point, broadcasting and multicasting scenarios. Wireless networking presents formidable challenges, and we consider the problem of unicast or point-to-point (peer-to-peer) communication in wireless networks in the presence of other nodes. We study the feasibility of admitting new links in an wireless network operating area while maintaining quality of service (QoS), in terms of signal-to-interference …

A Hybrid System Theoretic Approach For Admission Controller Design In Multimedia Networks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

A novel real-time discrete-event admission control (AC) scheme for high-speed networks is proposed with the aim of attaining a desired quality of service (QoS) and high network utilization. The AC uses the available capacity from a novel adaptive bandwidth estimation scheme, a congestion indicator derived from a congestion controller, peak bit/cell rate (PBR/PCR) estimate from new sources, along with the desired QoS metrics, and makes decisions whether to 'admit' or 'reject' new sources. The novel aspect of the proposed approach is the application of hybrid system theory to prove the performance of the admission controller, stability and the development of …

Study Of Relative Effectiveness Of Features In Content-Based Image Retrieval, S. R. Subramanya, Jui Che Teng, Yongjian Fu

Electrical and Computer Engineering Faculty Research & Creative Works

Content-based retrieval in image databases requires appropriate features of images to be derived and used in the indexing and searching process. Fast and accurate retrieval is crucial from a user point of view. The kinds of features used, their organization in suitable data structures, and the similarity search scheme, directly affect the speed and quality of content-based retrieval. In this paper, we evaluate the relative significance of three different image features - geometry, moments, and Fourier descriptors in the context of content-based retrieval, and present experimental results. The evaluation metrics are retrieval quality and search time. These could be used …

Incorporation Of Cerium And Neodymium In A Uranyl Hydroxide Solid, Chang-Soo Kim, David J. Wronkiewicz, R. J. Finch, E. C. Buck

Electrical and Computer Engineering Faculty Research & Creative Works

The migration behavior of radionuclides in a nuclear-waste repository will be influenced, in part, by their equilibrium solubilities in the presence of radionuclide-bearing solids and/or adsorption affinities as trace components onto the surfaces of solid host phases. Uranium phases that precipitate on the surface of altered spent nuclear fuel may thus influence the mobility of radionuclides released in the near-field environment, since by proximity, these will be the first phases that the radionuclides encounter following their release from the spent fuel matrix. We have evaluated the potential for incorporating radionuclides into crystalline compounds by precipitating uranyl phases from aqueous solutions …

Development Of A Testbed For Design And Evaluation Of Power Electronic Based Systems, S. Pekarek, J. Tichenor, N. Benavides, A. Koenig, H. Wang, Scott D. Sudhoff, B. Kuhn, S. Glover, D. Aliprantis, J. Byoun, J. Sauer

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a detailed technical description of a new hardware-based integrated power system testbed is presented. The testbed consists of an AC generation and propulsion system that is coupled to a DC zonal distribution system. A primary objective of the testbed is to provide a resource to the academic and industrial community by providing a non-proprietary system on which to demonstrate controls, survivability algorithms, and validate computer-aided design (CAD) tools. Copyright © 2002 Society of Automotive Engineers, Inc.

Political, National, Racial, And Imperial Unconscious In James Fenimore Cooper’S The Pioneers, Nizar Farouk Hermes

Dissertations and Theses @ UNI

Liberal humanist critics of James Fenimore Cooper's The Pioneers have for a long time relegated this politically packed nineteenth-century novel to the realms of the romantic. In the course of this study, I intend to show that Cooper's romantic discourse in The Pioneers is not "innocently romantic" as these critics have postulated. To argue for the political, national, racial, and imperial unconscious of The Pioneers as the latent, but active discourse throughout this text, I rely upon the materialist theories of Fredric Jameson, Louis Althusser, Michel Foucault, Terry Eagleton, Homi Bhabha, Benedict Anderson, and Edward Said.

Sugar Bread, Corrine Holke-Farnam

Dissertations and Theses @ UNI

No abstract provided.

Particle Size Dependent Response Of Aerosol Counters, A. Ankilov, A. Baklanov, M. Colhoun, K. H. Enderle, J. Gras, Yu Julanov, D. Kaller, A. Lindner, A. A. Lushnikov, R. Mavliev, F. Mcgovern, T. C. O'Connor, Josef Podzimek, O. Preining

Physics Faculty Research & Creative Works

During an international workshop at the Institute for Experimental Physics of the University of Vienna, Austria, which was coordinated within the Committee on Nucleation and Atmospheric Aerosols (IAMAS-IUGG), 10 instruments for aerosol number concentration measurement were studied, covering a wide range of methods based on various different measuring principles. In order to investigate the detection limits of the instruments considered with respect to particle size, simultaneous number concentration measurements were performed for monodispersed aerosols with particle sizes ranging from 1.5 to 50 nm diameter and various compositions. The instruments considered show quite different response characteristics, apparently related to the different …

Large Enhancement Of Spontaneous Emission Rates Of Inas Quantum Dots In Gaas Microdisks, W. Fang, Alexey Yamilov, Yinfa Ma, J. Y. Xu, S. T. Ho, G. S. Solomon, Hui Cao

Physics Faculty Research & Creative Works

Control of spontaneous emission in a microcavity has many important applications, e.g. improvement of the efficiency of light emitting devices. InAs quantum dots (QDs) embedded in microdisks are ideal systems for spontaneous emission control. The whispering gallery (WG) modes of microdisks have low volume and high quality factor. The homogeneous linewidth of InAs quantum dots is smaller than the spectral width of WG modes. Thus, a large enhancement of the spontaneous emission rates should be expected for QDs coupled to WG modes. However, large inhomogeneous broadening of the QD energy levels and random spatial distribution of the QDs in a …

Graduate Recital In Conducting, Julie Marie Feld

Dissertations and Theses @ UNI

In partial fulfillment of the Master of Music degree requirements for conducting, I prepared, rehearsed, and conducted Musi ca Vitale, a group of University of Northern Iowa graduate and undergraduate vocalists and instrumentalists. The recital took place March 7, 2002, in Davis Hall at the Gallagher-Bluedorn Performing Arts Center. The contents of the recital included Johann Sebastian Bach's Cantata 140, Wachet auf. ruft uns die Stimme, and Morten Lauridsen's song cycle Les Chansons des Roses. Musi ca Vitale consisted of nineteen vocalists, five sopranos, five altos, five tenors, and four basses. All vocalists were students in the School of Music …