Digital Commons Network^™

Lewis And Clark And The American Century: A Review Of Ken Burns's Pbs Series On The Corps Of Discovery, William L. Lang

History Faculty Publications and Presentations

Reviews Ken Burns's 1997 public television documentary on the Lewis and Clark expedition, 'Lewis and Clark: The Journey of the Corps of Discovery.' In his documentaries Burns seeks not just the "dry relation of fact," but a portrayal of the emotional truth of the historical event that allows viewers to connect with it as human drama. Burns has exploited well the inherent drama of the expedition's story to produce a compelling documentary. Rather than labeling it a work of history, based on explanation through critical inquiry, it is better seen as a "heritage" film. The latter identifies and celebrates virtues …

Filtration Modeling Of A Plate-And-Frame Press, Scott A. Wells

Civil and Environmental Engineering Faculty Publications and Presentations

The porosity distribution and filtrate production during cake filtration in a plate-and-frame filter press were simulated mathematically. The model considered filtration that occurs after the filling process, not filtration that occurs as the suspension fills the cell. Governing equations for the temporal porosity distribution were developed for a plateand- frame press. The governing equations were solved numerically using an alternating-direction-implicit scheme. Appropriate initial and boundary conditions were determined based on characteristics of the plate-and-frame press and of the suspension properties. Predicted porosity and velocity distributions were calculated for assumed constitutive parameters.

An Evaluation Of A Staff Mentor Program For At-Risk Students In An Oregon High School: Cake (Caring About Kids Effectively), Gail Lenore Hayes

Dissertations and Theses

This study examined the effect of a staff-mentoring program with students identified as at-risk of becoming early leavers. This mentoring program, Caring About Kids Effectively (CAKE), was implemented at a suburban secondary school in Oregon serving grades 9 through 12.

The study of the CAKE program had four research components: (a) indicators of school success (GPA, attendance, and attitudes toward school) were compared between at-risk students and those not at-risk; (b) indicators of school success were analyzed over the time at-risk students were mentored to find any significant change; (c) indicators of school success and enrollment status at graduation was …

The Effects Of Educational Setting And Instructor Type On Interaction Modifications, Katrina Kay Mcconaughey

Dissertations and Theses

The precise role of interaction in the process of second language acquisition and its place in the second language classroom are questions that continue to be important in research for both theoretical and applied linguists. The framework for this study is based on Long's (1983b) Interaction Hypothesis which proposes that input is made comprehensible by the modification of interactional structures. Many studies have looked at the differences between teacher-fronted classroom interaction and small group or dyad interaction without a teacher. The use of tutors and teaching assistants is common but not many studies have looked at how variation among instructor …

Role Of The Warrant In Presidential Debates : 1960, 1976, & 1996, Aaron Nicole Kaio

Dissertations and Theses

Every four years in America we make a decision about which candidate is best suited to be our next president. Over the past twenty years a standard component of the presidential campaign has been televised debates. These debates are supposed to help the public get a better understanding of the candidates' ideas about government, our future, and to demonstrate analytical skills and their ability to think on their feet.

This study set out to see how the candidates' arguments measured up to some basic argumentation standards. According to several scholars, none of the televised presidential debates qualify as 'true debates', …

Academic Esl Reading : Semantic Mapping And Lexical Acquisition, Jeffrey Darin Maggard

Dissertations and Theses

Second Language Acquisition (SLA) theoreticians and educators disagree whether vocabulary should be explicitly taught in second language learning classrooms. These individuals are divided about the most efficient way for L2 learners to increase the size of their lexicons. This thesis proposes that explicit vocabulary instruction may significantly facilitate lexical acquisition for adult second language learners in academic contexts.

An experimental study designed to investigate the relationship between explicit vocabulary instruction and the rate of lexical acquisition is described. It was hypothesized that metacognitive strategy training in semantic mapping activities would significantly increase the rate of lexical acquisition for upper-intermediate university …

Technology-Enhanced Presentations In Large Classrooms : Effects On Adult Academic Achievement And Computer Attitudes, Pamela Rae Hilberg

Dissertations and Theses

Rising enrollments and budget restrictions are resulting in larger class sizes which can lead to difficulties with learning. Computer technology has been suggested as a tool that may help overcome some of these difficulties. Research on outcomes is important to find ways that technology may be used by instructors to help students with information processing (Gagne & Driscoll, 1988), and to see if the financial commitment required for integrating educational technology is warranted.

The purpose of the present study was to examine the academic achievement and computer attitudes of students in courses taught with traditional presentations and technology-enhanced presentations taught …

Concurrent Validity Of Mental Ability Screening Tools : A Comparison Of Normal Students’ Performance On The Kaufman Brief Intelligence Test And The Shipley Institute Of Living Scale-Revised, D. Melanie Peters

Dissertations and Theses

This study compared the Kaufman Brief Intelligence Test (K-BIT), a verbal and nonverbal mental ability screening tool, to the Shipley Institute Living Scale (SILS), a nonverbal screening tool of mental ability, as part of a larger, ongoing study which is examining the effects of orofacial clefts on early career maturity. In terms of general intellectual ability, the K-BIT and the SILS provide descriptive categories, percentile ranks, raw scores, standard error of measurement, standard scores, standardization and norms, subtest scores, and total scores. The K-BIT provides normative curve equivalents and stanines, which the SILS does not. The SILS provides abstract and …

Surface Studies Of Metals After Interaction With Hydrogen Isotopes, David Samuel Silver

Dissertations and Theses

The objective of this research is to characterize surfaces of metals after interaction with hydrogen isotopes. Iron, which does not readily bond with hydrogen, and palladium, which strongly bonds with hydrogen, were studied. Observations of surfaces are used to determine the nature of their metamorphosis due to such exposures. An experimental study of pure iron foil (99.99%) exposed to a hot, dense hydrogen and argon gas mixture in a ballistic compressor yielded evidence for new structural and compositional changes of the metal due to the exposure. Atomic force microscope (AFM) studies demonstrated surfaces to be highly uneven, where height variations …

Using A Realistic Job Preview To Communicate Organizational Culture, Johanna Glode

Dissertations and Theses

The present study sought to determine how organizational culture information could best be presented to job applicants for the purpose of attracting employees who will fit into an organization's culture. Attraction to the organization's culture was hypothesized to influence applicant self-selection into the company. Two different types of Realistic Job Previews (RJPs), semantic and episodic, were compared in their ability to convey information accurately about a hypothetical organizational culture. Participant knowledge of the culture was hypothesized to align objective, or actual, fit with subjective perceptions of fit.

Knowledge of the organization's culture, objective fit, subjective fit, attractiveness of the culture, …

Speech Production Patterns Following Management Of Velopharyngeal Inadequacy, Debra Lynn Childs

Dissertations and Theses

This descriptive study investigated the pattern of speech sound production before and after surgical management of velopharyngeal inadequacy in two subjects. The research questions asked were: (a) What type of speech patterns do subjects referred for surgical management of velopharyngeal incompetence demonstrate presurgically? (b) What changes in the speech patterns of the subjects are observed in the immediate month following surgery for velopharyngeal incompetence? (c) Do these changes settle into a stabilized pattern of speech production by 4 months postsurgery?

The subjects' speech productions were audio recorded for analysis using the Broen CVC Probe to obtain imitated single word elicitations …

Career Orientation Levels In Adolescents : A Comparison Of Cleft And Noncleft Subgroups, Tara Darice Gaddis

Dissertations and Theses

The current research studied career orientation levels during adolescence utilizing previously collected cross-sectional data on 80 subjects. The subjects had participated in a study focusing on the ways in which clefting, gender, self-concept, mental ability, and socioeconomic status impact career development. Preliminary analysis of the data found that self-concept, mental ability, self-ratings of facial appearance, and desired level of future educational status were the factors most predictive of level of career development. In the initial analysis of the data, subjects, cleft and noncleft, who demonstrated high self-esteem, high mental ability, reported a more advanced level of desired higher education, and …

The Green Dyadic Formulation For Radiation Problems With Arbitrary Sources Embedded In Stratified Multi-Layer Structures : Application To Molecular Fluorescence Problems, Robert Lyle Hartman

Dissertations and Theses

The Green Dyadic method for computing fields due to current sources between parallel interfaces of dielectric materials is studied. Computer implementation of the method as presented in a well-known article leads to the conclusion that significant errors are present. Two dissimilar methods of solution lead to corrected formulations which are shown to be equivalent. The same correction is found in the research literature. For confirmation, computations are performed in examples involving an emitting dipole by both the Green dyadic method and Sommerfeld' s Hertz vector method. Finally, the computational examples are used to compute fluorescence decay rates for emitting dipoles …

Communicating Conceptual Design Of Mechatronic Systems, Muir Lee Harding

Dissertations and Theses

Today's engineering designers must adapt to a changing model of product development. In the past, a single engineer could design, develop and deploy competitive systems --this is often no longer the case. Designing a mechanical system with integrated microprocessor control requires the collaboration of a cross-disciplinary team of engineers and, in many cases, no single member of the team understands the workings of the entire system. Consequently, as systems become increasingly complex, the ability to collaborate and reliably communicate design information becomes more and more crucial. Effective communication 1s particularly critical in conceptual design, where a poor decision has the …

A Complex-Systems Perspective On The “Computation Vs. Dynamics” Debate In Cognitive Science, Melanie Mitchell

Computer Science Faculty Publications and Presentations

I review the purported opposition between computational and dynamical approaches in cognitive science. I argue that both computational and dynamical notions will be necessary for a full explanatory account of cognition, and give a perspective on how recent research in complex systems can lead to a much needed rapprochement between computational and dynamical styles of explanation.

Stackguard: Automatic Adaptive Detection And Prevention Of Buffer-Overflow Attacks, Crispin Cowan, Calton Pu, David Maier, Heather Hinton, Jonathan Walpole, Peat Bakke, Steve Beattie, Aaron Grier, Perry Wagle, Qian Zhang

Computer Science Faculty Publications and Presentations

This paper presents a systematic solution to the persistent problem of buffer overflow attacks. Buffer overflow attacks gained notoriety in 1988 as part of the Morris Worm incident on the Internet. While it is fairly simple to fix individual buffer overflow vulnerabilities, buffer overflow attacks continue to this day. Hundreds of attacks have been discovered, and while most of the obvious vulnerabilities have now been patched, more sophisticated buffer overflow attacks continue to emerge.

We describe StackGuard: a simple compiler technique that virtually eliminates buffer overflow vulnerabilities with only modest performance penalties. Privileged programs that are recompiled with the StackGuard …

Intrapopulation Sex Ratio Variation In The Salt Grass Distichlis Spicata, Sarah M. Eppley, Maureen L. Stanton, Richard K. Grosberg

Biology Faculty Publications and Presentations

In many dioecious plant populations, males and females appear to be spatially segregated, a pattern that is difficult to explain given its potentially high costs. However, in asexually propagating species, spatial segregation of the sexes may be indistinguishable from superficially similar patterns generated by random establishment of a few genets followed by extensive clonal spread and by gender-specific differences in rates of clonal spread. In populations where a significant fraction of individuals are not flowering and gender cannot be assigned to this fraction, apparent spatial segregation of the sexes may be due to differential flowering between the sexes. We confirm …

Genetic Markers In Plant Evolutionary Ecology, Mitchell B. Cruzan

Biology Faculty Publications and Presentations

Genetic markers have provided plant ecologists with a method of assessing levels of genetic relatedness among individuals and populations. In recent years a number of techniques based on DNA sequence variation have been developed to complement allozyme methods that are already widely used. Some of these new markers are more variable than protein-based markers, allowing more precise estimates of genetic differences among individuals and populations. Other DNA-based markers are based on organelle genomes that are inherited uniparentally. These cytoplasmic markers can provide a method for assessing the separate effects of seed and pollen dispersal on gene flow within and among …

Adaptive Prefetching For Device-Independent File I/O, Dan Revel, Dylan Mcnamee, David Steere, Jonathan Walpole

Computer Science Faculty Publications and Presentations

Device independent I/O has been a holy grail to operating system designers since the early days of UNIX. Unfortunately, existing operating systems fall short of this goal for multimedia applications. Techniques such as caching and sequential read-ahead can help mask I/O latency in some cases, but in others they increase latency and add substantial jitter. Multimedia applications, such as video players, are sensitive to vagaries in performance since I/O latency and jitter affect the quality of presentation. Our solution uses adaptive prefetching to reduce both latency and jitter. Applications submit file access plans to the prefetcher, which then generates I/O …

Spiritual Nourishment: A Central Christian Metaphor, Susan Sleeth Mosedale

Dissertations and Theses

Since its origins, Christianity has been pervaded by a large array of images in which the spiritual realities are symbolized as food. Such images may be not only verbal, but visual or expressed in actions. These images can be seen as expressions of a spiritual nourishment metaphor; I apply here the meaning of "metaphor" proposed by the linguist George Lakoff and the philosopher Mark Johnson: a metaphor is a concept that structures ideas and actions as well as language. This thesis establishes the spiritual nourishment metaphor as a philosophical concept and begins to explore its history within Christianity.

The spiritual …

Meeting Notes 1997-12-11 , Joint Policy Advisory Committee On Transportation

Joint Policy Advisory Committee on Transportation

No abstract provided.

Sellwood-Moreland Neighborhood Plan Action Charts: Adopted By Resolution Number 35663, Portland (Or.). Office Of The City Auditor

Portland City Archives

No abstract provided.

The Female Identity In Rosario Ferré'S Papeles De Pandora, Marcie Lynn Pratt

Dissertations and Theses

This thesis examines four stories from Rosario Ferré's first book of short stories, Papeles de Pandora: "La muñeca menor," "Cuando las mujeres quieren a los hombres," "Amalia," and "La bella durmiente." In Papeles de Pandora, Ferré explores the portrayal of female identity by dismantling the traditional roles that are assigned to women in Puerto Rican, patriarchal society. This thesis analyzes the ways in which Ferré skillfully deconstructs and (re)constructs the identity and sense of self of her female protagonists.

To demonstrate Ferré's deconstruction and (re)construction of the female identity, this study focuses on Ferré's use of recurring motifs …

Examination Of Benefits Of Binaural Auditory Stimulation For Children With A Cochlear Implant And A Hearing Aid In The Contralateral Ear, Evonne Nicol Altesleben

Dissertations and Theses

Congenital or acquired hearing impairments put children at risk of delayed language development. Today the cochlear implant (Cl) is a viable amplification option for some children with profound hearing losses. Audiologists often recommend that children with hearing impairments be fitted with binaural hearing aids in the hope that maximum stimulation will occur and that auditory deprivation will be lessened. An area lacking investigation is whether binaural stimulation will be beneficial to the cochlear implant recipient.Controversy also exists regarding the use of a hearing aid in the non-implanted ear.

The focus of this study was to compare binaural auditory stimulation benefits …

Faculty Senate Monthly Packet December 1997, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The December 1997 Monthly packet includes the December agenda and appendices and the Faculty Senate minutes and attachments from the meeting held November 1997.

A Comparison Of Listener And Speaker Perception Of Stuttering Events, Anne Jocelyn Schagen

Dissertations and Theses

Stuttering identification, measurement, research, and treatment have for many years had their basis in listener judgment of stuttering, but the covert aspects of stuttering are not behaviorally observable, and inter-rater reliability has repeatedly been shown to be low. Perkins (1990) has emphasized the importance of consulting the speaker for the most reliable perspective on stuttering identification. The question raised in this study is whether there is a significant correlation between stuttering identification based upon internal perception by a speaker who stutters, and identification based upon external perception of listeners, with points of inter-rater disagreement removed. Six adult males, aged 18 …

First Language And Gesture Acquisition In Children With Cerebral Palsy, Ann Christine Friel

Dissertations and Theses

Many children with Cerebral Palsy (CP) will receive speech and language intervention throughout their lives. However, there is a lack of descriptive data for language and gesture development of children with CP. When assessing the skills of children with CP, standardized tests and clinical observations have several inherent faults due to time constraints, normative data, and physical constraints. An alternative method used to gather data in the area of language and gesture development is parent questionnaire. The MacArthur Communicative Development Inventory: Words & Gestures was chosen for this study because it has been shown to be an efficient, valid, and …

The Role Of Skill Upgrading In Manufacturing Performance, Melissa M. Appleyard

Business Faculty Publications and Presentations

This section examines the industry-wide trend of upgrading the skills of production workers in the semiconductor industry. This analysis discusses the industry characteristics driving this trend, the human resource policies that support skill upgrades, and the payoffs associated with such upgrades. To provide a deeper understanding of the process of skill upgrading, two fabs from our sample are analyzed in detail. One fab is located in Japan (pseudonym Jfab) and the other fab is located in the U.S. (pseudonym USfab).

As a central part of their manufacturing strategy, these fabs have emphasized the upskilling of operators particularly for equipment maintenance …

Flow And Congestion Control For Internet Streaming Applications, Shanwei Cen, Calton Pu, Jonathan Walpole

Computer Science Faculty Publications and Presentations

The emergence of streaming multimedia players provides users with low latency audio and video content over the Internet. Providing high-quality, best-effort, real-time multimedia content requires adaptive delivery schemes that fairly share the available network bandwidth with reliable data protocols such as TCP. This paper proposes a new flow and congestion control scheme, SCP (Streaming Control Protocol) , for real-time streaming of continuous multimedia data across the Internet. The design of SCP arose from several years of experience in building and using adaptive real-time streaming video players. SCP addresses two issues associated with real-time streaming. First, it uses a congestion control …

A Longitudinal Study Of The Career Maturity Patterns Of Individuals With Clefts, Joyce Johnson Anderson

Dissertations and Theses

This longitudinal study sought to examine career maturity, and the variables thought to influence career maturity, in a sample of individuals with the congenital craniofacial anomaly of clefting by following them from adolescence (ages 14 to 18) into young adulthood (ages 22 to 26).

Sixteen subjects (6 males, 10 females) during adolescence and in young adulthood completed (a) a biographical questionnaire which provided educational and occupational information, (b) the Career Development Inventory, (c) the Tennessee Self-Concept Scale, (d) the Shipley Institute of Living Scale, and (e) self-ratings of speech and facial appearance acceptability to provide information concerning career maturity, mental …