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Filtering by: Alternative title ssim Technical note no. 202 Remove constraint Alternative title ssim: Technical note no. 202 Academic Affiliation Computer Science Remove constraint Academic Affiliation: Computer Science File Format pdf Remove constraint File Format: pdf

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  • 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
    Full Text:
    ; - xk)2 + (Yi - Yk)2 + (z; - zk)2 - Rl) 2 (6) i=l 8 Note the similarity to equation 1. The new

  • 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
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    operation a in RU W indicates that data item Xis accessed by a. Note that Ri[X] denotes operation a such

  • Snitch : a flexible student program plagiarism detector

    Creator:
    Schricker, Theodor Karl, Jr.
    Abstract:
    In most technical fields, a certain amount of practical application is necessary to master the important concepts and acquire basic problem solving skills. Computer science is no different, and this is reflected in the frequent programming assignments given in programming and data structures courses. The basic skills and concepts gained...
    Resource Type:
    Capstone Project
    Full Text:
    u LI J 1 1. Introduction In most technical fields, a certain amount of practical

  • 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
    Full Text:
    document defines the mechanisms used to define new classes and instances . No attempt is made to teach the

  • 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
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    material is based upon work supported by the National Science Foundation under Grant No. ECS-8307478

  • 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
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    Engineering under Grant No. A-3182. the National Science Founda- No. ECS-8307478 and in part by Research

  • 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
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    in a better style, and drawing the general rule from the specific case. It is interesting to note

  • 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
    Full Text:
    in the GUHA literature (2, 3, 4, S]. · It suffices her ·e to note that it is dealt with in the

  • 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
    Full Text:
    constructed by truncation and contraction methods. He found no difference in the number of correct interpre

  • 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
    Full Text:
    studies provided almost no information about the subject's debugging process - what debugging strategies