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  • Recreation experience management zones for whitewater boating in the Lower Deschutes River Canyon

    Creator:
    Lowney, David W.
    Abstract:
    Rapid increases in the recreational use of the Lower Deschutes River Canyon threaten the quality and diversity of downriver recreational experiences. The concept of recreation experience management is discussed and recreation experience management zones for whitewater boating are delineated and described.
    Resource Type:
    Capstone Project
    Full Text:
    IN THE LOWER DESCHUTES RIVER CANYON by DAVID W. LOWNEY A RESEARCH PAPER submitted to THE

  • 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
    Full Text:
    - ORIENTED PROGRAMMING LANGUAGES David W. Sandberg Department of Computer Science Oregon State

  • Smalltalk and exploratory programming

    Creator:
    Sandberg, David W.
    Abstract:
    Using Smalltalk-80, programmers can produce prototypes much faster than with C or Pascal. What techniques do Smalltalk-80 programmers use to produce these prototypes? What is special about Smalltalk-80 that enables them to uses these techniques? Can these techniques be used with conventional languages such as C? In an attempt to...
    Resource Type:
    Technical Report
    Full Text:
    Programming* David W. Sandberg Computer Science Department Oregon State University Corvallis, Oregon

  • Grif : a graphical programming language for robotics

    Creator:
    Sandberg, David W.
    Resource Type:
    Technical Report
    Full Text:
    Graphical Programming Language for Robotics David W. Sandberg Department of Computer Science Oregon

  • Experience with an object-oriented virtual machine

    Creator:
    Sandberg, David W.
    Abstract:
    Several years ago we began development of an object-based programming language and environment which we call X2. We implemented X2 using a virtual machine similar to Smalltalk-80 implementations, but X2 does no message look-up. The implementation differs from most Smalltalk-80 systems in that objects are paged and in the ability...
    Resource Type:
    Technical Report
    Full Text:
    OBJECT-ORIENTED VIRTUAL MACHINE David W. Sandberg Department of Computer Science Oregon State

  • What is object-oriented programming?

    Creator:
    Sandberg, David W.
    Abstract:
    The term object-oriented is defined. This definition is then related to message-passing, inheritance, polymorphism, data abstraction, generics, and overloading.
    Resource Type:
    Technical Report
    Full Text:
    Programming? David W. Sandberg Department of Computer Science Oregon State University Corvallis, Oregon

  • An alternative to subclassing

    Creator:
    Sandberg, David W.
    Abstract:
    Smalltalk-80 obtains some of its expressive power from arranging classes in a hierarchy. Inheritance is an important aspect of this hierarchy. An alternative organization of classes is proposed that emphasizes description instead of inheritance. This alternative can be used with compile-time type checking and retains the important characteristics of Smalltalk's...
    Resource Type:
    Technical Report
    Full Text:
    David Sandberg Department of Computer Science Oregon State University Corvallis, Oregon l 7 l

  • Type checking and parameterized types

    Creator:
    Sandberg, David W.
    Abstract:
    A method for implementing parameterized types is given. Two simplifying restrictions are assumed: types are only parameterized with other types, and assignment is like that of SNOBOL, CLU, and Smalltalk. An algorithm for type checking that handles parameterized types and overloading is presented .
    Resource Type:
    Technical Report
    Full Text:
    Parameterized Types David Sandberg Department of Computer Science Oregon State University Corvallis

  • The design of the programming language X-2

    Creator:
    Sandberg, David W.
    Abstract:
    The design of an experimental object-based programming language is discussed. The language is intended for investigating techniques for organization of programs.
    Resource Type:
    Technical Report
    Full Text:
    Programming Language X-2 David W. Sandberg Department of Computer Science Oregon State University

  • Top-Down Effects of Wildlife and Bottom-Up Drivers of Soils and Productivity in Intensively Managed Forest Plantations in the Northern Oregon Coast Range

    Creator:
    Frey, David W.
    Abstract:
    In intensively managed forest plantations in the northern Oregon Coast Range, herbicides are often applied during site preparation and early stand regeneration to reduce competition for resources for planted conifer seedlings. In addition to reducing competition for crop trees, herbicide applications may affect soil processes including decomposition and nutrient cycling,...
    Resource Type:
    Masters Thesis
    Full Text:
    THESIS OF David Frey for the degree of Master of Science in Sustainable Forest Management