منابع مشابه
Positive feedback
Positive feedback is a process that occurs in a feedback loop in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation.[1] That is, A produces more of B which in turn produces more of A.[2] In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback.[1][3] Mathematically, positive feedback is...
متن کاملWhat About Feedback?
The role of immediate feedback in-group conversations has received scant attention in the recent literature. While studies from the early 1990’s suggested that “added information” in the form of non-verbal cues would allow video conferencing to “augment” the audio-only conference in terms of effectiveness, stunningly little follow-on research has been done reflective of the current state of com...
متن کاملEFL TEACHERS’ BELIEFS ABOUT ORAL CORRECTIVE FEEDBACK AND THEIR FEEDBACK-PROVIDING PRACTICES ACROSS LEARNERS’ PROFICIENCY LEVELS
The present study investigated EFL teachers’ beliefs about oral corrective feedback (CF), their CF-provision practices across elementary and intermediate levels, and their beliefs-practices correspondence. To this end, the researchers conducted a semi-structured interview with the teachers and went on an overall forty-hour observation of their classrooms across both levels. The findings reveale...
متن کاملFeedback and positive feedback stabilizability and holdability
Consider the following problem. Given a discrete-time linear system, find, if possible, linear state-feedback control laws such that under these laws all trajectories originating in the non-negative orthant of the state space remain non-negative while asymptotically deteriorating to the origin. This problem is called feedback stabilizability-holdability problem (FSH). If, in addition, the requi...
متن کاملPhysiological Positive Feedback Mechanisms
In positive feedback mechanisms, the response to a stimulus does not stop or reverse it but instead keeps the sequence of events going up. At first glance, this would appear to be a counter to the principle of homeostasis, since a positive feedback loop has no obvious means of stopping. Not surprisingly, therefore, the positive feedback is less common in nature than the negative one. A positive...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/349462a0