Digital Commons Network^™

Grazing Reflection Of Gaussian Beams, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

The reflectivities of most surfaces are higher for grazing or near-90-deg angles of incidence than for more perpendicular or near-zero-deg angles. Grazing-incidence configurations are especially important in the development of lasers and optical systems that operate in the far-ultraviolet and soft-x-ray regions of the spectrum, where transparent or highly reflecting media are almost unknown. Analytical solutions of the paraxial wave equation are obtained for the grazing reflection and complex interference effects that take place when a Gaussian beam interacts at shallow angles with a reflecting surface.

Constructive Induction Machines For Data Mining, Marek Perkowski, Stanislaw Grygiel, Qihong Chen, Dave Mattson

Electrical and Computer Engineering Faculty Publications and Presentations

"Learning Hardware" approach involves creating a computational network based on feedback from the environment (for instance, positive and negative examples from the trainer), and realizing this network in an array of Field Programmable Gate Arrays (FPGAs). Computational networks can be built based on incremental supervised learning (Neural Net training) or global construction (Decision Tree design). Here we advocate the approach to Learning Hardware based on Constructive Induction methods of Machine Learning (ML) using multivalued functions. This is contrasted with the Evolvable Hardware (EHW) approach in which learning/evolution is based on the genetic algorithm only. Various approaches to supervised inductive learning …

Critical Multiculturalism And The Globalization Of Capital: Some Implications For A Politics Of Resistance, Ramin Farahmandpur, Peter Mclaren

Educational Leadership and Policy Faculty Publications and Presentations

Despite the historic defeat of Marxism and constant attempts by so-called progressive educators to exorcize any residual Marxist discourse from the literature on multiculturalism, the contradictions of capital playing themselves out in the theater of contemporary social relations are beckoning Marx's spectre to return and further trouble those theories proclaiming that the "end of ideology" is upon us and that all we need to do in order to rescue humanity is to heed the clarion call of diversity. Too often overlooked in the debates over multiculturalism at present engulfing the academy are the myriad ways in which globalization is shaping …

Archaeological Investigations At 45cl1 Cathlapotle (1991-1996) , Ridgefield National Wildlife Refuge Clark County, Washington: A Preliminary Report, Kenneth M. Ames, Cameron M. Smith, William L. Cornett, Elizabeth A. Sobel, Stephen C. Hamilton, John Wolf, Doria Raetz, United States. Department Of The Interior, U.S. Fish And Wildlife Service, Region 1, Portland State University. Department Of Anthropology

Anthropology Faculty Publications and Presentations

This is the preliminary report, one in a series on the archaeology of the Wapato Valley region of the Lower Columbia River. Most of the reports discuss aspects of the excavations and archaeology of two sites, the Meier site (35CO5) and Cathlapotle site (45CL1). Other related topics are also treated.

Archaeological investigations at site 45CL1, Clark County, Washington, demonstrate that the locality is a very large (c 1.5ha), deeply stratified (2-4m) town site with an occupation spanning at least 1000 years (c. AD 1000 to 1840). Six large, complex depressions have been mapped. Test excavations show that these depressions represent …

Strategies Of Indian Burning In The Willamette Valley, Robert T. Boyd

Anthropology Faculty Publications and Presentations

This chapter, included in Indians, Fire and the Land in the Pacific Northwest, published by the Oregon State University Press in 1999, explores fires set by the aboriginal inhabitants of the Willamette valley.

In 1971, geographer Carl Johannessen and colleagues at the University of Oregon published an article, "The Vegetation of the Willamette Valley," which proposed that, prior to European contact, the Willamette Valley, though surrounded by dense forests of Douglas-fir, was an open oak.savanna grassland. They also presented historical evidence to show that these prairie grasslands were maintained by annual fires set by the aboriginal inhabitants of the …

Logic Synthesis For A Regular Layout, Marek Perkowski, Yang Xu, Malgorzata Chrzanowska-Jeske

Electrical and Computer Engineering Faculty Publications and Presentations

New algorithms for generating a regular two-dimensional layout representation for multi-output, incompletely specified Boolean functions, called, Pseudo-Symmetric Binary Decision Diagrams (PSBDDs), are presented. The regular structure of the function representation allows accurate prediction of post-layout areas and delays before the layout is physically generated. It simplifies power estimation on the gate level and allows for more accurate power optimization. The theoretical background of the new diagrams, which are based on ideas from contact networks, and the form of decision diagrams for symmetric functions is discussed. PSBDDs are especially well suited for deep sub-micron technologies where the delay of interconnections limits …

Trace: A Visual Software System To Explore Properties Of Reed-Muller Movement Functions, Marek Perkowski, Alan Mishchenko

Electrical and Computer Engineering Faculty Publications and Presentations

We present new experimental Windows 95/98/NT software for investigation of graph properties of boolean (in particular, Reed-Muller) logic with an equal number n of inputs and outputs (called movement functions). Realized at the input of an n-bit register, such functions create autonomous Finite State Machines (FSMs). TRACE software system allows the user to visualize State Transition Graphs (STGs) of the autonomous FSMs. Other features of TRACE help explore graph properties of function families. These families are produced by a generic function, differing from it only in the order of components, one operation, or one literal (this literal is complemented or …

A New Technique For Estimating Confidence Intervals On Dea Efficiency Estimates, Janice Forrester, Timothy R. Anderson

Engineering and Technology Management Faculty Publications and Presentations

A new approach to chance constrained DEA is described and experimental results are given for calculating a confidence band for the estimated production function. This allows an interval containing the most likely production function, to be specified with a predetermined level of confidence.

A Data Dictionary Approach To Meeting User Requests For Accounting Information, Kristi Jane Yuthas, Dennis F. Togo

Business Faculty Publications and Presentations

In this era of massive data accumulation, dynamic development of large-scale databases and inteifaces intended to be user-friendly, there is still an increasing demand on analysts as actual user access to databases is still not a common practice. A data dictionary approach, that includes providing users with a list of relevant data items within the database, can expedite the analysis of information requirements and the development of user-requested information systems. Furthermore, this approach enhances user involvement and reduces the demands on the analysts for systems development projects.

Adaptive Resource Management Via Modular Feedback Control, Ashvin Goel, David Steere, Calton Pu, Jonathan Walpole

Computer Science Faculty Publications and Presentations

A key feature of tomorrow’s operating systems and runtime environments is their ability to adapt. Current state of the art uses an ad-hoc approach to building adaptive software, resulting in systems that can be complex, unpredictable and brittle. We advocate a modular and methodical approach for building adaptive system software based on feedback control. The use of feedback allows a system to automatically adapt to dynamically varying environments and loads, and allows the system designer to utilize the substantial body of knowledge in other engineering disciplines for building adaptive systems. We have developed a toolkit called SWiFT that embodies this …

Feedback Based Dynamic Proportion Allocation For Disk I/O, Dan Revel, Dylan Mcnamee, Calton Pu, David Steere, Jonathan Walpole

Computer Science Faculty Publications and Presentations

In this paper we propose to use feedback control to automatically allocate disk bandwidth in order to match the rate of disk I/O to the real-rate needs of applications. We describe a model for adaptive resource management based on measuring the relative progress of stages in a producer-consumer pipeline. We show how to use prefetching to transform a passive disk into an active data producer whose progress can be controlled via feedback. Our progress-based framework allows the integrated control of multiple resources. The resulting system automatically adapts to varying application rates as well as to varying device latencies.

Soliton Stability In A Z (2) Field Theory, J. J. P. Veerman, D. Bazeia, Fernando Moraes

Mathematics and Statistics Faculty Publications and Presentations

We investigate the stability of the coupled soliton solutions of a two-component Z(2) vector fieldmodel, in contraposition to similar solutions of a Z(2)×Z(2)model recently introduced. We demonstrate that the coupled soliton solutions of the Z(2) model are classically unstable.

Geometrical Models For Grain Dynamics, Giovani L. Vasconcelos, J. J. P. Veerman

Mathematics and Statistics Faculty Publications and Presentations

We study models for the gravity-driven, dissipative motion of a single grain on an inclined rough surface. Imposing some conditions on the momentum loss due to the collisions between the particle and the surface, we arrive at a class of models in which the grain dynamics is described by one-dimensional maps. The dynamics of these maps is studied in detail. We prove the existence of various dynamical phases and show that the presence of these phases is independent of the restitution law (within the class considered).