Showing items related by title, author, creator and subject.

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  Teaching Authority Control [English version] presented at the International Conference Teaching Authority Control. In Proceedings International Conference Authority Control: Definition and International Experiences, Florence

  Taylor, Arlene (2003)

  The teaching of authority control in schools of library and information science is alive and well, even though it is not perceived this way by some former students. Many professors are fervently attempting to imbue the next generation of librarians with an understanding of the necessity for authority control. Unfortunately, they have to fight the nonunderstanding of colleagues, the lack of course time to be as thorough as desired, and the perception that information technology is uppermost in importance among courses to be taught. However, because the chaotic environment of the Web has brought attention to the need for authority control (e.g., the "semantic web"), we have a new opportunity to teach these concepts to a new generation of information professionals.
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  Control of mixing in a nonreactive plane shear layer: I. Open-loop control. II. Feedback control.

  Wiltse, John Michael. (The University of Arizona., 1993)

  A control system for the enhancement and regulation of mixing in a nonreactive plane shear layer has been developed in a two-stream closed-return water facility. Mixing of a passive scalar is estimated using a thermal analog in which the two streams have uniform, steady temperatures differing by 3°C. The position of the temperature interface between the two streams is measured in the plane of its cross stream Schlieren image by an optical sensor which is placed upstream of the rollup of the primary vortices. Control is effected via an array of surface heaters flush-mounted on the flow partition and cross-stream temperature distributions are measured with a resolution of 0.03°C using an array of closely-spaced cold wire sensors. In closed-loop experiments the output from the interface position sensor is fed back to the surface heaters. A transfer function is used to predict the effect of feedback on the interface motion. The dependence of various measures of mixing on the feedback gain k and the total delay time Δ between the actuators and the sensors is studied. The feedback gain k is adaptively modified to maximize mixing at a given streamwise station. These experiments indicate that feedback control of the motion of the temperature interface can be used for controlling the nominally 2D entrainment by the primary vortices and thus enhancing mixing.
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  Crime, criminal careers and social control: A methodological analysis of economic choice and social control theories of crime.

  Britt, Chester Lamont, III. (The University of Arizona., 1990)

  This study tests the validity of two theories of crime: economic choice (as manifest in the criminal career paradigm) and social control. The test of these two theories is primarily methodological, in that four types of crime data (official and longitudinal (Uniform Crime Reports), official and cross-sectional (Bail Decisionmaking Study), self-report and longitudinal (National Youth Survey), and self-report and cross-sectional (Seattle Youth Study)) and a variety of graphical and statistical techniques are used to compare findings on (1) the stability of the age distribution of crime, (2) the prevalence of offense specialization, and (3) the differences in the causes of participating in crime compared to the causes of frequency of criminal activity among those individuals committing crimes. The findings on the relation between age and crime show the general shape of the age-crime curve is stable across year of the data or curve, type of data, cohort, and age group. The tests for offense specialization reveal that offenders are versatile. An individual's current offense type is not predictable, with much accuracy, on the basis of prior offending. Again, the lack of offense specialization held across type of data, but age, race, and gender distinctions also failed to alter significantly the observed pattern of versatility. Findings on the causes of participation in crime and frequency of criminal activity among active offenders showed only trivial differences in the set of statistically significant predictors for each operationalization of crime and delinquency. Two distinct operationalizations of frequency also showed no substantial difference in the set of statistically significant predictors. Similar to the findings on age and crime, and offense specialization, the pattern of results for the participation and frequency analyses held across type of data. In sum, the results tended to support the predictions of social control theory over those of the economic choice-criminal career view of crime.