The proposal for the research project reported herein was principally prepared during 1968 and the starting date for this study was established as September 1, 1969. In the approximately four years from the preparation of this proposal to the completion of this final report, the state of the art for...
A program has been written to investigate the
dynamics of robot manipulators during task execution.
The program simulates robot motion along a path specified
by the user. A smooth trajectory is generated by
interpolation in joint space. Forces and torques on
actuators are calculated at intermediate points, using a
recursive...
Phase-space trajectories are often used to describe a system's
stability or response characteristics. It is desirable to observe such
a phase-space trajectory directly from an analog simulation of a
system, but a conventional oscilloscope display does not provide an
axis for the third variable,
A third axis could be provided...
In this thesis a method is presented for maintaining the left
ventricular wall stress of the human heart at a constant level during
the systole (active portion of the heart's cycle). This constant stress
level makes it possible to take isotonic measurements on the heart
muscles.
The left ventricle of...
A consumer orientated simulation of rotary solenoid performance
allows the user to determine what effects non-standard conditions
will have on performance in a contemplated application. Typical
variable conditions are: loads temperature and voltage.
Three differential equations are used to describe the solenoid
operation. Two of these are non-linear, second-order equations...
A compartmental model of the immune system is simulated.
Chapter I discusses the importance of such a
model, reviews past immune system models, and summaries
the immunological theory the model is based upon. In
Chapter II, the compartmental representation of the immune
system is developed from immunological and physiological
theory....
Effects of stochastic variations of parameters in the planning
and design of a particleboard production system are studied. The
solution obtained from a linear deterministic optimization model is
compared against both the solution derived from the traditional
stochastic programming techniques and the distribution of optimal
objective function values obtained from...
This thesis presents thermodynamic evaluations of various biomass-fueled combined-cycle power plants using a computer model developed for simulating such plants. The combined-cycle systems Investigated are characterized by having a wood-fueled combustor, an indirect-fired gas turbine, and a steam cycle. This work was part of a larger biomass energy project at...
The objective of many simulations is to study the
steady-state behavior of a nonterminating system. The
initial conditions of the system are often atypical because
of the complexity of the system. Simulators often start
the simulation with the system empty and idle, and
truncate, or delete, some quantity of the...
This study presents the results of using common two or three-parameter "default" distributions in place of "best fit distributions" in simulations of serial production lines with finite buffers and blocking. The default distributions used instead of the best-fit distribution are chosen such that they are non-negative, unbounded, and can match...
This thesis presents the details of a large-scale laboratory experiment to study the runup velocity on a complex 3D bathymetry. The PIV measurements including the instrumental setup, the recording procedure, and the image processing are presented. Tsunami inundation directly affects the coastal population and is one of the most important...
The purpose of this study was to compare the drying curves of
2-inch thick Douglas-fir heartwood boards as predicted by a
computer simulation by C. A. Hart (1983) with those actually
observed in experimental kiln runs. The moisture gradients within
test boards were also simulated by the computer program and...
Four study sites were selected along an altitudinal gradient on Mt. Ashland in the Siskiyou Mountains of southern Oregon. The altitudinal gradient roughly corresponded to a gradient in temperature and water availability ranging from very hot and dry to cool and moist. Air and soil temperatures were continuously measured on...
The purpose of this study is to examine the challenges of accepting and commissioning a new treatment planning system for eye plaque brachytherapy. Currently Oregon Health and Science University (OHSU) utilizes v5.3.9 of the Plaque Simulator software to plan all of its eye plaque brachytherapy cases. However, v5.3.9 is no...
The Open Modeling Environment (OME) is a tool developed to address some known shortcomings in ecological System Dynamics (SD) modeling research. OME provides a common set of methods for interacting directly with spatial information, reducing the need for modelers to create their own methods for doing so. The environment is...
A computerized ranch simulation model of an eastern Oregon cattle
ranch was tested for its ability to evaluate the economics of public
rangeland improvement practices. The model was used to estimate
likely impacts of various public policy alternatives for rangeland
improvement on the relative profitability of a 400 mother cow...
The achievements of this thesis are the development of several models for the SPICE (Simulation Program with Integrated Circuit Emphasis) simulation of alternating-current thin-film electroluminescent (ACTFEL) devices, organic light-emitting devices (OLEDs), and polymer light-emitting devices (PLEDs). First, an ACTFEL model based on the built-in HSPICE Fowler-Nordheim tunneling diode is developed,...
In order to understand the atmospheric branch of the earth's
hydrologic cycle on the global scale, an atmospheric moisture balance
is diagnostically analyzed from the January and July data of the OSU
atmospheric general circulation model, which has been integrated for
thirty-nine months of simulation with seasonally-varying sea-surface
temperature and...
A computer simulation was developed as a technique for
studying the effects of the process dynamics on the operator's
sampling and control behavior. This methodology was
used to study the effects of the process input memory
variation in the presence of different observation noise
levels. It was concluded that the...
This thesis describes a control tool for managers of a
Broiler Breeder Farm, a farm which raises chickens for the purpose
of fertile egg production. It presents the development of
a simulation of a Broiler Breeder Farm which uses a deterministic
step by step process to generate expected values of...
The problem of resource planning has long been a topic of interest for operations managers in both production and service industries. Inputs such as raw materials, energy, and capital are limited resources; therefore, managers must make informed decisions regarding the use of these inputs. This thesis addresses the area of...
The objective of many steady-state simulations is to
study the behavior of a nonterminating system with a peak load
of infinite duration. Due to the complexity of the system, the
initial conditions of the system are often atypical that often
requires the simulators to start the system with the empty...
A digital computer model was developed to simulate the time
and space distribution of a dissolved pollutant in an estuary. The program
is basically a one-dimensional finite-difference model, but two
dimensions can be represented by attaching together several one-dimensional
channels. The influence of convection, dispersion and
decay are included in...
Evaluation and sensitivity analysis of a soil-water---
atmosphere-plant simulation model, SWATRE, developed by
Feddes et al (1978) in The Netherlands was conducted.
The evaluation was performed with the observed data
obtained by Cuenca (1978) for three different irrigation
levels in UC82 variety tomato fields in Davis,
California. SWATHE requires about...
Contemporary circuit design involves significant computer-based simulation, calling for a balance between circuit model accuracy and simulation run time. Traditionally, circuit modelers concentrated on producing either (1) physically-based models, where each element in the model correlates to a physically meaningful aspect of the device being modeled or (2) mathematically-based "macromodels,"...
Monte Carlo simulation is used to quantify and characterize uncertainty in a variety of applications such as financial/engineering economic analysis, and project management. The dependence or correlation between the random variables modeled can also be simulated to add more accuracy to simulations. However, there exists a difference between how correlation...
In order to investigate potential climate impacts on landscape-scale ecosystem processes, I implemented a dynamic general vegetation model (DGVM) over a large domain in northern California and western Nevada on a rectangular grid of ca. 800-meter spatial resolution. I used 100 years of observed, monthly climate and nine future climate...
This dissertation investigates the problem of uncertainty in complex ecological models. The term "complex" is used to convey both the common and scientific meanings. Increasingly, ecological models have become complex because they are more complicated; ecological models are generally multi-variate and multi-leveled in structure. Many ecological models are complex because...
For many decades, production and assembly lines have played an important role in industrial manufacturing systems. In particular, they have proved to be an efficient way to organize the production of high volume products in many industries. In their effort to improve the efficiency of production lines, researchers encountered two...
SIDAC-I is a digital analog simulator which permits analog as
well as hybrid simulations to be programmed on a digital computer.
FORTRAN, a scientific computer language, may be included as an
integral part of the SIDAC-I simulation language. The simulator
consists of a controller program and a set of predefined...
An analog simulation of the postural control system (PCS) of a
dog is used to illustrate how modern systems simulation can be applied
to a study of complex life systems. Even though many bold
assumptions were required to adequately simplify the PCS model, the
simulation provided intuitive insight and gave...
During the summer of 1980 an infiltration/sedimentation study was
conducted on the Oregon Range and Related Resource Validation Project
Work Area in the Blue Mountains of east-central Oregon. A modified
Rocky Mountain infiltrometer was used to simulate a 28 minute high
intensity rainfall event to determine mean infiltration rates and...
A versatile computational technique for improved time domain modeling of electromagnetic radiative systems is demonstrated. Two computational methods are combined: the finite-difference time domain (FDTD) method, a full-wave electromagnetic field solver, and the Kirchhoff surface integral formulation, a spatial transformation technique. The combined FDTD/Kirchhoff technique is shown to increase accuracy...
The harmonic problem in power systems is gaining more attention as incidences correlated with harmonics increase. Conventional passive filtering techniques for harmonic mitigation have inherent problems, and purely active filters have the disadvantages of higher costs and ratings. Hybrid active filters inherit the efficiency of passive filters and the improved...
Algorithms and simulators comprised of SPICE3 as a circuit level simulator and two device simulators EOFLOW and PROPHET for accurate simulation of new types of devices are presented in this thesis. An integration of EOFLOW with SPICE3 creates a capability for efficient simulation of a system containing interconnected electroosmotic flow...
The objectives of this study are to revise and reformulate a
previous simulation model of the Calapooia River and proposed
Holley Dam project and to critically investigate the anadromous
fish enhancement function of the project.
The Corps of Engineers proposes a 145,000 acre-foot reservoir
for the Calapooia River at Holley,...
In this thesis, we develop a simulator for estimating the energy consumed in executing tasks on a mobile device - the Palm Pilot. We measured the energy consumed by each instruction of the device's assembly language and incorporated these measurements into a public domain emulator for the Palm Pilot. This...
Kinematic tectonic models constrained by Airy isostatic equilibrium demonstrate the crustal-scale evolution of the Brooks Range during ocean basin closure, arc-continent collision, and exhumation of the orogen. The Bouguer gravity anomaly low that develops across the orogen is related by wavelength to the amount of shortening during collision, and by...
"During the four meetings of the consumer modeling committee, discussion centered on the formation of systems models and the
problems they will pose for researchers concerned with consumer populations. Two coarse models were developed from these discussions, a compartment model (Figure 1) and a process model (Figure 2). The
compartments...
This simulation is a model for a tidal power-peaking plant that
can be used to determine the electrical peaking generation for a given
set of conditions.
The simulation internally contains a tide producing function
for a specific year, the hydraulic characteristics of the plant, and the
plant's machines' characteristics. The...
This study focuses on investigation of the RETRAN modeling
concepts in the analysis of a safety valve discharge transient.
Three safety valve tests conducted at the Combustion Engineering
test facility were chosen for evaluation with RETRAN. It was
essential to apply the critical flow boundary condition at the
downstream nodes...
I used program CAPTURE to analyze 1,535 data sets for 33 North American species of small mammals for sources of variation in capture probabilities and to characterize species-specific responses to markrecapture trapping. CAPTURE incorporates seven models to account for all possible combinations of heterogeneity (h), behavioral response (b), and time...
The design of a switched capacitor successive approximation A/D converter is discussed in this thesis. This design adopts a novel capacitance mismatch error cancellation algorithm proposed in references [25, 27]. Detailed charge domain analysis is given in this thesis, which results in an improvement of the proposed algorithm by tracing...