OBJECTIVES Preemptive renal transplant has been associated with better survival of both the allograft and the recipient than has conventional renal transplant. It remains unclear, however, whether preemptive transplant is optimal for renal replacement therapy. We describe our experience with preemptive renal transplant. MATERIALS AND METHODS We retrospectively analyzed 32 preemptive and 132 n...

Scheduling theory as it applies to hard real-time environments with precedence and strict periodicity constraints — environments where the failure to satisfy any constraint may have disastrous consequences [1], [2] — seems currently to be enjoying a renaissance. The most widely studied problems in this field concern periodic non-preemptive tasks for systems where data are collected throught cap...

The scheduling of tasks within a parallel program onto the underlying available processors has been studied for some time. To date, solutions to this problem generally assume that communication only occurs at the start or end of each parallel task, i.e., the child task can only start its execution when all its parent tasks complete and have sent data to it. This is termed \non-preemptive task s...

Consider a two-class unobservable priority queue, with Poisson arrivals, generally distributed service, and strategic customers. Customers are charged fee when joining the premium class. We analyze maximum revenue achievable under non-preemptive (NP) preemptive-resume (PR) policies, show that provider is always better off implementing PR policy. Further, sometimes achieved only fraction of cust...

We consider a multi-source status update system, where each source generates packets according to Poisson process which are then served generally distributed service time. For this M/G/1/1 queueing model, we self-preemptive packet management policy and derive the moment generating functions (MGFs) of age information (AoI) peak AoI source. According policy, an arriving fresh preempts possible sa...

in order to examine the invasion of iraq from the perspective of international law, this paper will review the legal reasons for the occupation of iraq, and also, the question of research is that whether the occupation of iraq from the perspective of right to use force is justifiable or not? by analyzing the prohibition of the use force principle in international relations and its exceptions, i...

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...

in a randomized, double blind study , we compared post operative pain and analgesic requirement in patients undergoing cesarean section with two types of general anesthesia: standardized general anesthesia (control group=26 cases) and preemptive low-dose ketamine (0.2 mg/kg) administered prior to anesthesia induction (keratmine group=27 cases). postoperative analgesia was provided for both grou...