Preemptive scheduling is widespread in operating systems and in parallel processing on symmetric multiprocessors. However, in distributed systems it is practically unheard of. Scheduling in distributed systems is an important issue, and has performance impact on parallel processing, load balancing and metacomputing. Non-preemptive scheduling can perform well if the task lengths and processor sp...

Despite consensus in focus on form (FOF) instruction over the facilitative role of noticing, controversy has not quelled over ways of directing EFL learners’ attention towards formal features via implicit techniques like input-enhancement or explicit metacognitive feedback and interactive peer-editing on the output they produce. This quasi-experimental study investigated the impact of input enh...

This study investigated the effects of planned focus-on-form instruction (pFFI) on developing oral grammatical accuracy in Iranian English EFL learners. To this end, 60 lower-intermediate EFL learners studying English in a private English language institute in Tehran, Iran, were randomly assigned to two classes. Both classes received a task-based instruction on grammatical points elicited in or...

Preemptive kidney transplantation is associated with superior outcomes. Patients who have kidney failure due to systemic lupus erythematosus (SLE) may not receive a preemptive kidney transplant because of the concern for risk of disease recurrence with shortened graft and patient survival. We identified 8001 patients in the United Network for Organ Sharing dataset who underwent kidney transplan...

This paper is motivated by the need to provide per session quality of service guarantees in fast packet-switched networks. We address the problem of characterizing and designing scheduling policies that are optimal in the sense of minimizing buuer and/or delay requirements under the assumption of commonly accepted traac constraints. We investigate buuer requirements under three typical memory a...

The almost infinite potential educational uses of information and communication technology (ICT) will only be realized when most teachers have sufficient knowledge and skills to truly integrate ICT into their curricula, utilizing it to make teaching and learning more effective and efficient. For this to be accomplished teachers must experience the integration of ICT into their own pre-service l...

This paper is motivated by the need to provide per session quality of service guar antees in fast packet switched networks We address the problem of characterizing and designing scheduling policies that are optimal in the sense of minimizing bu er and or delay requirements under the assumption of commonly accepted tra c constraints We investigate bu er requirements under three typical memory al...

[This paper is part of the Focused Collection on Gender in Physics.] This study examined the perceptions of 6th grade middle school students regarding physics and physics-related careers. The overarching goal of this work was to understand similarities and differences between girls’ and boys’ perceptions surrounding physics and physics-related careers as part of a long-term effort to increase f...