نتایج جستجو برای: selective feedback
تعداد نتایج: 344805 فیلتر نتایج به سال:
O PPORTUNISTIC beamforming is a reduced feedback communication strategy for vector broadcast channels which only requires partial channel state information (CSI) at the base station for its operation. Although reducing feedback, this strategy, in its plain implementations, displays a linear growth in the feedback load with the total number of users in the system, which can be an onerous require...
OBJECTIVES Current models of ADHD suggest abnormal reward and punishment sensitivity, but the exact mechanisms are unclear. This study aims to investigate effects of continuous reward and punishment on the processing of performance feedback in children with ADHD and the modulating effects of stimulant medication. METHODS 15 Methylphenidate (Mph)-treated and 15 Mph-free children of the ADHD-co...
this study is a typological description of written formative feedback in an efl context in iran. twenty m.a. students of tefl participated in the study. they were required to summarize a scholarly article in each session on which the instructor would provide written corrective feedback (cf). written formative comments were extracted, coded, and categorized into various types, such as asking for...
fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...
We report on the existence, stability and dynamical properties of two-dimensional self-localized vortices with azimuthal numbers up to 4 in a simple model for lasers with frequency-selective feedback.We build the full bifurcation diagram for vortex solutions and characterize the different dynamical regimes. The mathematical model used, which consists of a laser rate equation coupled to a linear...
Abstract Orthogonal frequency division multiplexing (OFDM) has been attracting much attention for very high-speed data transmission over a frequency-selective fading channel. To improve the performance in a fading channel, some form of antenna diversity technique is necessary. Recently, Alamouti’s space-time coded transmit diversity (STTD) has been gaining a lot of attention for downlink (base-...
abstract ion selective electrodes (ises) are electrochemical sensors that respond selectivity to the activity of ionic species. an ion-selective electrode is an electrochemical device that uses a thin selective membrane or film as the recognition element, and is an electrochemical half-cell equivalent to other half-cells of the zeroth (inert metal in a redox electrolyte). in common methods o...
New methods and new systems are needed to ®lter or to selectively distribute the increasing volume of electronic information being produced nowadays. An eective information ®ltering system is one that provides the exact information that ful®lls user's interests with the minimum eort by the user to describe it. Such a system will have to be adaptive to the user changing interest. In this paper...
Douglas S. Robertson is Adjunct Professor at the Department of Geological Sciences and CIRES, University of Colorado, Boulder, Colorado; Michael C. Grant is Professor at the Department of E.P.O. Biology, University of Colorado, Boulder, Colorado. BY DOUGLAS S. ROBERTSON AND MICHAEL C. GRANT Feedback exists in selective Darwinian processes because the populations that are being altered by evolut...
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