Index Catalog // ScholarsArchive@OSU

Future climate projections. Jackson County : February 2023

Creator:: Dalton, Meghan, Fleishman, Erica, and Bachelet, Dominique
Abstract:: Climate change is expected to increase the occurrence of many climate-related natural hazards. Confidence that the risk of heat waves will increase is very high given strong evidence in the peer-reviewed literature, consistency among the projections of different global climate models, and robust scientific principles that explain why temperatures increase...
Resource Type:: Technical Report

Future climate projections. Clackamas County : February 2023

Creator:: Dalton, Meghan, Fleishman, Erica, and Bachelet, Dominique
Abstract:: Climate change is expected to increase the occurrence of many climate-related natural hazards. Confidence that the risk of heat waves will increase is very high given strong evidence in the peer-reviewed literature, consistency among the projections of different global climate models, and robust scientific principles that explain why temperatures increase...
Resource Type:: Technical Report

Bridge Creek Wilderness : Wilderness Character Baseline Assessment Report

Creator:: Deibel, Jenna and Hall, Troy
Abstract:: This report assesses how current management actions are adhering to the original mandate set by the Wilderness Act of 1964 by monitoring the five qualities of Wilderness character (untrammeled, natural, undeveloped, opportunities for solitude/unconfined recreation, and other features of value) as they pertain to this specific Wilderness area.
Resource Type:: Technical Report

Status of the European Green Crab, Carcinus maenas, (aka 5-spine crab) in Oregon Estuaries. Report for 2022

Creator:: Yamada, Sylvia Behrens, Royer, Cameron, Schooler, Shon, Flitcroft, Rebecca, Vance, Mitch, Randall, Andrea, and Fisher, Jennifer
Abstract:: The European green crab (Carcinus maenas) has persisted in Oregon and Washington coastal estuaries since the late 1990s. A strong year class arrived during the 1998 El Niño, but numbers decreased and remained below 1 per trap per day until the arrival of the 2015-2016 El Niño. Since then, numbers...
Resource Type:: Technical Report

Vernonia Community Indicators of Vitality: 2013 Baseline Assessment Executive Summary

Creator:: Grotta, Amy
Abstract:: This document summarizes the Vital Vernonia Indicator Project, an effort aimed at exploring community vitality in Vernonia, particularly in light of recent catastrophic floods and subsequent rebuilding and community development initiatives. The Vital Vernonia Indicator Project is a collaboration of Oregon State University Extension Service, Rural Studies Program, and the...
Resource Type:: Technical Report

Vernonia Community Indicators of Vitality: 2013 Baseline Assessment Report

Creator:: Grotta, Amy
Abstract:: This document is a report on the Baseline Vital Vernonia Indicator Project, an effort aimed at exploring community vitality in Vernonia, particularly in light of recent catastrophic floods and subsequent rebuilding and community development initiatives. The Vital Vernonia Indicator Project is a collaboration of Oregon State University Extension Service, Rural...
Resource Type:: Technical Report

From concrete forms to generalized abstractions through perspective-oriented analysis of logical relationships

Creator:: Yang, Sherry and Burnett, Margaret M.
Abstract:: We believe concreteness, direct manipulation and responsiveness in a visual programming language increase its usefulness. However, these characteristics present a challenge in generalizing programs for reuse, especially when concrete examples are used as one way of achieving concreteness. In this paper, we present a technique to solve this problem by...
Resource Type:: Technical Report

Software configuration management (SCM) support process capability maturity model

Creator:: Ghotra, Baljinder Singh
Abstract:: Software Configuration Management (SCM) is a concept of trying to group the changing artifacts of software development to try to manage the complexity of modern day software. This paper provides a roadmap for improving the SCM support process based on a meta-model. I developed a model that defines key practice...
Resource Type:: Technical Report

Sacagawea: a testbed for experimenting with real-time problem solving techniques

Creator:: Koerper, Greg
Abstract:: The Sacagawea testbed has been designed to support testing and development of decision making models, and associated uncertainty management techniques, that are appropriate under real-time problem solving constraints. Conceptually, it provides a simulated temporal and spatial environment, the latter consisting of a terrain grid of elevation and tree cover data,...
Resource Type:: Technical Report

Algorithms for computing sprinkler layouts for lawns

Creator:: Krishnappa, Chirayu
Abstract:: Watering a lawn involves several factors such as laying out the sprinklers and valves, trenching, laying pipes, cables, etc. The primary goal is to ensure uniform watering subject to various constraints. We present some abstract problems involving sprinkler layout and some solutions with theoretical worst case bounds on their performance....
Resource Type:: Technical Report

Best sorting algorithm for nearly sorted lists

Creator:: Kim, Do Jin
Resource Type:: Technical Report

Effect of update merging on reliable storage performance

Creator:: Liu, Ching-Chao and Minoura, Toshimi
Abstract:: Performance of a reliable storage subsystem for a centralized database system was studied by simulation. The reliable storage subsystem studied consists of three redundant disk units that are updated one at a time from a consistent database state to another consistent database state, Thus, even if a central processor and/or...
Resource Type:: Technical Report

Preliminary results of an experimental study of the mechanical design process

Creator:: Ullman, David G., Stauffer, Larry A., and Dietterich, Thomas G.
Abstract:: This paper presents the initial results from an empirical study of mechanical design engineers. In this study, six engineers were video-taped solving real mechanical design problems. Preliminary analysis of this protocol data has yielded several important findings, including (a) mechanical designers progress from systematic to opportunistic behavior as the design...
Resource Type:: Technical Report

Position estimation

Creator:: McKenney, Paul E.
Abstract:: Acoustic position estimation is used where high accuracy navigation is required over a small area, such as for searching or for collecting gravitational or geomagnetic data. In this position estimation method, a surface ship or submersible periodically sends out a high-frequency acoustic 'ping' at a prearranged frequency. This ping is...
Resource Type:: Technical Report

Pipelining performance of structured dataflow networks

Creator:: Tonge, Fred. M.
Abstract:: System architectures for interconnecting large numbers of processors are being widely studied [AG82,TH75,TR82]. Of particular interest in such architectures is the exploitation of concurrency among processors. This concurrency can be parallelism, in which different parts of a single data case are processed at the same time, or pipelining, in which...
Resource Type:: Technical Report

Computer science and computer engineering research equipment

Creator:: Tonge, Fred M.
Abstract:: This grant supported acquisition of a minicomputer system for departmental research. The equipment selected is a DEC VAX-11/750 system, installed in remodeled space in the Computer Science (formerly Farm Crops) Building. Grant funds for equipment acquisition were supplemented by support from the Tektronix Foundation. After completion of the physical facilities...
Resource Type:: Technical Report

Expert systems for exploratory data analysis : towards automated research

Creator:: Springsteel, Fred Neil
Abstract:: Exploratory Data Analysis (EDA) is a lesser known field which has outgrown the bounds of statistics. It differs from ordinary, or “confirmatory”, data analysis. Originated by John Tukey, EDA aspires toward an open-ended meta-goal: to discover “all interesting” [nontrivial, normal form, valid] hypotheses about a domain that is represented by...
Resource Type:: Technical Report

Biomedical knowledge acquisition : three systems reviewed

Creator:: Springsteel, Frederick Neil
Abstract:: Recent advances in diagnostic expert systems have been limited by the crucial Knowledge Acquisition Problem: to bring expert heuristics into logical, conditional rule forms useful for computer aided diagnosis. Some automatic systems with potential biomedical relevance that do acquire knowledge are reviewed here, and analyzed from the standpoint of possible...
Resource Type:: Technical Report

Type systems of object-oriented programming languages

Creator:: Sandberg, David W.
Abstract:: Three different approaches to type checking have been taken in object-oriented programming languages. Smalltalk-80 uses run-time type checking. C++ uses subtypes. A third alternative is to use parameterized types. We examine the difficulties of programming in an object-oriented fashion with compile-time type checking and argue that parameterized types are better...
Resource Type:: Technical Report

Typographic style is more than cosmetic

Creator:: Oman, Paul W. and Cook, Curtis R.
Abstract:: There is disagreement about the role and importance of typographic style (source code formatting and commenting) in program comprehension. Results from experiments and opinions in programming style books are mixed. This paper presents principles of typographic style consistent and compatible with the results of program comprehension studies. It introduces the...
Resource Type:: Technical Report

Effects of programming experience in debugging semantic errors

Creator:: Oman, Paul W., Cook, Curtis R., and Nanja, Murthi
Abstract:: This paper presents the results of a controlled experiment comparing debugging abilities of novice, intermediate and skilled student programmers. Debugging performance differences were studied using two single-page Pascal programs: a binary search program and a median calculation program. Two types of semantic errors, array bounds and undefined variable, and two...
Resource Type:: Technical Report

Particularity in engineering data

Creator:: Rehfuss, Steve, Freiling, Michael J., and Alexander, Jim
Abstract:: A database to be used by electrical circuit design, test, and repair expert systems must support both structural data and inferential data about the circuit. It is well known that engineering databases must support dynamic schema (re)definition of the structural data and entity-based access to it. We analyze this requirement...
Resource Type:: Technical Report

Preliminary X2 language reference manual

Creator:: Sandberg, David
Abstract:: X2 is an object-oriented programming language. Object-oriented programming models everything in the world as objects that have some local state that may vary with time. If the state of an object varies with time the object is mutable. If the state is time independent the object is immutable. Each object's...
Resource Type:: Technical Report

Program comprehension differences in debugging

Creator:: Nanja, Murthi and Cook, Curtis R.
Abstract:: Many studies have shown that expert programmers are more effective at debugging programs than novice programmers. These studies have suggested that the major reason for this difference is due to the experts' superior comprehension of the program. This paper reports two experiments which investigated expert and novice student programmers program...
Resource Type:: Technical Report

A preliminary investigation of the effects of FORTRAN data declaration and type conversion features on program comprehension

Creator:: Nanja, Murthy and Cook, Curtis R.
Abstract:: FORTRAN permits both explicit and implicit options for both data declaration and type conversion features. This study investigated the effects of explicit and implicit data declaration and type conversion features on a program comprehension task performed by FORTRAN programmers in an introductory programming course. The results indicated that both factors...
Resource Type:: Technical Report

An empirical study of UNIX command abbreviation schemes

Creator:: Nanja, Murthi and Cook, Curtis R.
Abstract:: This study examined the UNIX command abbreviation schemes preferred by expert and novice UNIX programmers. The two parts of the conducted experiment were: subjective rating of UNIX command abbreviations for each of the six abbreviation categories (acronym, combination, contraction, identity, synonym, and truncation); subjects suggested descriptive command names for UNDC...
Resource Type:: Technical Report

Implementation of a distributed commit/termination protocol by communicating Moore machines

Creator:: Minoura, Toshimi
Abstract:: In this short paper, we present an implementation method for a distributed commit/ termination protocol for a distributed database system. The protocol, which handles both commit and termination processing of distributed transactions, is represented by communicating Moore machines. Several advantages of our approach are discussed.
Resource Type:: Technical Report

Consistent distributed database state maintenance

Creator:: Minoura, Toshimi, Owicki, Susan S., and Wiederhold, Gia
Abstract:: A theory for resiliency control of distributed database systems is developed, and schemes that preserve the consistent global database state in the presence of site crashes and message link failures are discussed. The schemes can at least theoretically be paired with any concurrency control scheme that produces y-serializable executions. Further,...
Resource Type:: Technical Report

Multi-level concurrency control of a database system

Creator:: Minoura, Toshimi
Abstract:: A typical database system maintains target data, which contain information useful for users, and access path data, which facilitate faster accesses to target data. Further, most large database systems support concurrent processing of multiple transactions. For a static database system model, where units of concurrency control are not dynamically created...
Resource Type:: Technical Report

Capability-based resiliency control of distributed database systems

Creator:: Minoura, Toshimi and Vidyasankar, K.
Abstract:: It is highly desirable for a distributed database system to achieve logically continuous operation even if some sites or message links fail. In this paper, we describe a scheme that can automatically reconfigure a fully-replicated distributed database system upon subsystem failures. The scheme can tolerate total failures of some sites....
Resource Type:: Technical Report

Serializability test by pebbling

Creator:: Minoura, Toshimi
Abstract:: An execution of a database system is considered correct if its net effect is as if transactions were executed serially, and such an execution is called serializable. In this short paper we show that the serializability test problem can be reduced to a simple pebbling problem. Our characterization is intuitive...
Resource Type:: Technical Report

True-copy token scheme for a distributed database system

Creator:: Minoura, Toshimi, Owicki, Susan S., and Wiederhold, Gio
Abstract:: A concurrency and resiliency control scheme for a distributed database system with replicated data is discussed. The scheme, true-copy token scheme, uses true-copy tokens in order to designate the physical data copies (true copies) that can be identified with the current logical data that are globally unique, and then it...
Resource Type:: Technical Report

High-level language research and development, High-level language design considerations for firmware engineering of microprogrammable computers

Creator:: Lewis, Ted G., Malik, K., and Dietterich, Thomas G.
Abstract:: Microprogramming has evolved since its introduction in 1951 by Maurice Wilkes. The most significant change that has taken place is the recent growth of interest in user microprogramming. However, user microprogramming is a difficult task because of various complex and intricate features of the host processors. A microprogrammer must be...
Resource Type:: Technical Report

Internal hashing for dynamic and static tables

Creator:: Lewis, Ted G. and Cook, Curtis R.
Abstract:: This tutorial discusses one of the oldest problems in computing: how to search and retrieve keyed information from a list in the least amount of time. Hashing - a technique that mathematically converts a key into a storage address - is one of the best methods of finding and retrieving...
Resource Type:: Technical Report

A note on the style metric of Berry and Meekings

Creator:: Harrison, Warren and Cook, Curtis R.
Abstract:: The "style metric" of Berry and Meekings is purported to quantify the lucidity of software written in the C programming language. We used a modification of this metric to try and identify error-prone software. Our results indicate that this metric seems to bear little relationship to the density of errors...
Resource Type:: Technical Report

SIDUR - an integrated data model

Creator:: Freiling, Michael J.
Abstract:: Tbc expanding complexity of database application worlds, and the accelerating pace of change of these worlds mandate data models which support some of the tasks of data interpretation which formerly were borne by the applications programs. Chief among these are the support for virtual data, definition of transactions, and enforcement...
Resource Type:: Technical Report

STYLE : an automated program style analyzer for Pascal

Creator:: Lake, Al and Cook, Curtis R.
Resource Type:: Technical Report

Two short papers on machine learning

Creator:: Flann, Nicholas S. and Dietterich, Thomas G.
Abstract:: This technical report reprints two articles that appeared in Proceedings of the Third International Machine Learning Workshop at Skytop, Pennsylvania, June 24-26, 1985. The first paper, The EG Project: Recent Progress, summarizes work on the EG project, which is investigating the role of active experimentation in aiding machine learning programs....
Resource Type:: Technical Report

Software development in parallax : the ELGDF Language, ELGDF : design language for parallel programming

Creator:: El-Rewini, Hesham and Lewis, Ted G.
Abstract:: ELGDF (Extended Large Grain Data Flow) is a design language that allows representation of a wide variety of parallel programs. The syntax is graphical and hierarchical to allow construction and viewing of realistically sized programs. ELGDF language facilitates describing parallel programs in a natural way for both shared memory model...
Resource Type:: Technical Report

Parallel algorithms for decomposed linear programs

Creator:: Wu, Youfeng and Lewis, Ted G.
Abstract:: New parallel algorithms for solving the decomposed linear programs are developed. Direct parallelization of the sequential algorithm results in very limited performance improvement using multiple processors. By redesigning the algorithm, we achieved more than 2*P times performance improvement over the sequential algorithm, where P is the number of processors used...
Resource Type:: Technical Report

A powerdoman semantics for indeterminism

Creator:: Wise, David S.
Abstract:: A denotational semantics is presented for a language that includes multiple-valued functions (essentially Lisp S-expressions), which map from ground values into the power domain of ground values. The domain equations are reflexive. and fixed points of all functions are defined. Thus, it is possible to specify an operating system as...
Resource Type:: Technical Report

The applicative style of programming

Creator:: Wise, David S.
Resource Type:: Technical Report

Representing matrices as quadtrees for parallel processors

Creator:: Wise, David S.
Resource Type:: Technical Report

A hybrid approach to reasoning under uncertainty

Creator:: D'Ambrosio, Bruce
Abstract:: A complete approach to reasoning under uncertainty requires support for both identification of the appropriate hypothesis space and ranking hypotheses based on available evidence. We present a hybrid reasoning scheme which combines symbolic and numeric methods for uncertainty management to provide efficient and effective support for both of these tasks....
Resource Type:: Technical Report

VNS -- a virtual network simulator

Creator:: Domka, Walter F. and Freiling, Michael J.
Abstract:: A software system to study network algorithms was implemented on UNIX. Each part of a network algorithm can be written as a single C program which becomes a virtual node in the network. During a simulation all virtualized nodes run as separate processes on a single PDP 11/44. Inter-node communication...
Resource Type:: Technical Report

FORLOG : a logic-based architecture for design

Creator:: Dietterich, Thomas G. and Ullman, David G.
Abstract:: It is difficult to build intelligent computer-aided design (ICAD) programs using available expert system shells and AI programming languages. To build ICAD programs, tools are needed that support (a) generative search of design spaces, (b) deep search of design spaces to evaluate alternative designs, (c) simultaneous exploration of alternative designs...
Resource Type:: Technical Report

Learning at the knowledge level

Creator:: Dietterich, Thomas G.
Abstract:: When Newell introduced the concept of the knowledge level as a useful level of description for computer systems, he focused on the representation of knowledge. This paper applies the knowledge level notion to the problem of knowledge acquisition. Two interesting issues arise. First, some existing machine learning programs appear to...
Resource Type:: Technical Report

Artificial intelligence at OSU

Creator:: Dietterich, Thomas G. and D'Ambrosio, Bruce
Abstract:: This report describes of current research in Artificial Intelligence at Oregon State University. The five areas of active research are ( a) intelligent aids for mechanical engineering design, (b) active experimentation as a method in machine learning, ( c) techniques for combining logic programming and assumption-based truth maintenance, ( d)...
Resource Type:: Technical Report

A summary of machine learning papers from IJCAI-85

Creator:: Dietterich, Thomas G., Flann, Nicholas S., and Wilkins, David C.
Abstract:: This report reviews the 31 papers on machine learning that were presented at the Ninth International Joint Conference on Artificial Intelligence (IJCAI-85) held in Los Angeles during August, 1985. The papers are grouped according to a taxonomy of the various subareas of machine learning research. The areas receiving the most...
Resource Type:: Technical Report

A knowledge level analysis of learning programs

Creator:: Dietterich, Thomas G.
Abstract:: This chapter develops a taxonomy of learning methods using techniques based on Newell’s knowledge level. Two properties of each system are defined: knowledge level predictability and knowledge level learning. A system is predictable at the knowledge level if the principle of rationality can be applied to predict its behavior. A...
Resource Type:: Technical Report

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