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Thirty learning disabled students of average intellectual ability between 16 and 17 years of age were given both the WISC-R and the WAIS-R to determine if the WAIS-R provided higher average IQ scores, as had been reported for educationally mentally retarded adolescents. The results indicated: (a) no significant differences between the two scales on either the Verbal, Performance, or Full Scale IQs, (b) significant correlations between the WISC-R and WAIS-R on the three IQ scores and 9 of the 11 subtests, and (c) the emergence of the ACID profile for learning disabled adolescents on both tests. 相似文献
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Robert B. Anderson Julius A. Marshall Andrea L’Afflitto 《Journal of The Franklin Institute》2021,358(12):6281-6308
In classical model reference adaptive control (MRAC), the adaptive rates must be tuned to meet multiple competing objectives. Large adaptive rates guarantee rapid convergence of the trajectory tracking error to zero. However, large adaptive rates may also induce saturation of the actuators and excessive overshoots of the closed-loop system’s trajectory tracking error. Conversely, low adaptive rates may produce unsatisfactory trajectory tracking performances. To overcome these limitations, in the classical MRAC framework, the adaptive rates must be tuned through an iterative process. Alternative approaches require to modify the plant’s reference model or the reference command input. This paper presents the first MRAC laws for nonlinear dynamical systems affected by matched and parametric uncertainties that constrain both the closed-loop system’s trajectory tracking error and the control input at all times within user-defined bounds, and enforce a user-defined rate of convergence on the trajectory tracking error. By applying the proposed MRAC laws, the adaptive rates can be set arbitrarily large and both the plant’s reference model and the reference command input can be chosen arbitrarily. The user-defined rate of convergence of the closed-loop plant’s trajectory is enforced by introducing a user-defined auxiliary reference model, which converges to the trajectory tracking error obtained by applying the classical MRAC laws before its transient dynamics has decayed, and steering the trajectory tracking error to the auxiliary reference model at a rate of convergence that is higher than the rate of convergence of the plant’s reference model. The ability of the proposed MRAC laws to prescribe the performance of the closed-loop system’s trajectory tracking error and control input is guaranteed by barrier Lyapunov functions. Numerical simulations illustrate both the applicability of our theoretical results and their effectiveness compared to other techniques such as prescribed performance control, which allows to constrain both the rate of convergence and the maximum overshoot on the trajectory tracking error of uncertain systems. 相似文献
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Martin J. Markey Ronald H. Fredrickson Richard W. Johnson Mary Alice Julius 《Counselor Education & Supervision》1970,9(3):178-182
Study was made of training impact of different electronic playback techniques on ratings of student counselor performance. Thirty-two upperclass university females were randomly divided into four playback treatment groups: (a) audio-video, (b) audio, (c) video, and (d) no playback received. Four underclass university females served as trained clients. All student counselors interviewed two different trained clients in two 20-minute sessions separated by a playback treatment period. All sessions were recorded by television cameras. Trained judges rated the second interview using the Counselor Evaluation Inventory, Nonverbal Behavior Scale, and Audio-Visual Counseling Scale. Two-way analysis of variance was used to compare scores on criterion instruments. Results indicated no judged differences among the playback treatment groups, nor could discriminant rankings be made among the various playback methods. Several explanations are discussed as to limited influence of playback media on early interview performance. 相似文献
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Ramon B. Goings Julius Davis Joseph Britto Dijaria Greene 《Mentoring & Tutoring: Partnership in Learning》2017,25(3):346-368
There has been a national- and state-level call for colleges and universities to develop targeted mentoring programs for Black males. However, there is limited published scholarship that has investigated the experiences of non-U.S.-born Black males in these college mentoring programs generally, and at historically Black colleges and universities (HBCUs) specifically. Thus, the purpose of this qualitative study is to examine the experiences of a 17-year-old Black male college sophomore from the United Kingdom who enrolled in a HBCU male-focused mentoring program. Findings reveal that he benefited from pre-college mentoring as he developed strategies to respond to racist encounters during his K–12 schooling in the United Kingdom. In the university mentoring program, he benefited most from one-on-one mentoring opportunities with university officials. Implications for universities and future research are discussed. 相似文献