An adaptive delta-sigma modulator of 1st order with one-bit quantization is presented. Adaptation is instantaneous and based on an exponential law. The feedback signal is a multibit discrete-level signal generated by a digital-to-analog converter (DAC). Compared to a nonadaptive delta-sigma modulator of 1st order, the input dynamic range is significantly enhanced. The gain in dynamic range is 6...

PURPOSE To present a method for estimating the local arterial input function (AIF) within a dynamic contrast-enhanced MRI scan, based on the alternating minimization with model (AMM) method. MATERIALS AND METHODS This method clusters a subset of data into representative curves, which are then input to the AMM algorithm to return a parameterized AIF and pharmacokinetic parameters. Computer sim...

With a modulo-N accumulator and a set of reference waveforms, a new architecture of high-performance digital frequency synthesizer is devised. The reference waveforms with the same frequency but different phases are passed through a multiplexer to obtain the maximal frequency with an incrementer. A Gray encoder is designed to eliminate the glitch problem. The performance of the synthesizer is i...

F.-C. Kuo, K.-Y. Sim, Chang-ai Sun, S.-F. Tang and Zhi Quan Zhou Faculty of Information and Communication Technologies, Swinburne University of Technology, Australia School of Engineering, Swinburne University of Technology, Sarawak Campus, Malaysia Department of Mathematics and Computing Science, University of Groningen, The Netherlands School of Computer Science and Software Engineering, Univ...

the benefits of textual input enhancement in the acquisition of linguistic forms have produced mixed results in sla literature. the present study investigates the effects of textual enhancement on adult foreign language intake of two english linguistic forms-subjunctive mood and inversion structures-to explore the role of the type of linguistic items in input enhancement studies. it also invest...