Background A 3D Dual Cardiac Phase (3D-DCP) scan was proposed to obtain systolic and diastolic images with equivalent quality and scan time compared to the 3D single cardiac phase acquisition (Uribe et al, Radiology 2008). In this work, we propose to accelerate the acquisition and reconstruction of the 3D-DCP approach by sharing information from the outer k-space of both cardiac phases using Ra...

In this letter, we propose a polarity decision carrier recovery algorithm that is useful for carrier acquisition in high order QAM. The PD (Phase Detector) output and its variance characteristic are mathematically derived and the simulation results are presented. The proposed algorithm shows enhanced acquisition performance especially for large frequency offset. key words: carrier recovery, QAM...

Using heterodyne Optical Phase-Locked Loops (OPLLs), two 1W high power 1550 nm master-oscillator-power-amplifier (MOPA) semiconductor lasers operating as current controlled oscillators are phase-locked to a 1 mW reference laser. The signals of the two MOPAs are then coherently combined and their mutual coherence is studied. In each OPLL, the acquisition range is increased to +/-1.1GHz with the ...

the purpose of the present study was to investigate the effect of self-controlled (sc) and instructor-controlled (ic) feedbacks on the acquisition of dart motor skill using videotape feedback. for this purpose, 200 female volunteer students of university of tehran participated in this research. after the questioners had been filled out, 36 individuals were randomly selected from 152 qualified p...

This work presents a method for modeling and simulating a second-order analog phase-locked loops (PLL) in time domain for studying its acquisition behavior. The proposed method uses phase error process for analyzing the PLL characteristics. The method enables to study the lockin and pull-in phenomena of analog PLL and the effects of changing phase offset and voltage offset values on acquisition...

Currently, "task analysis" is the dominant paradigm in the knowledge acquisition community. We argue that for performance systems (i.e. systems that do not have to offer a knowledge-level description of their performance at runtime) a simpler "test analysis" approach may suffice. We offer examples were a seemingly-naive testing regime gives rise to competent performance systems. Further, by cer...