By splitting a large broadcast message into segments and broadcasting the segments in a pipelined fashion, pipelined broadcast can achieve high performance in many systems. In this paper, we investigate techniques for efficient pipelined broadcast on clusters connected by multiple Ethernet switches. Specifically, we develop algorithms for computing various contention-free broadcast trees that a...

There are a number of models that were proposed in recent years for message passing parallel systems. Examples are the postal model and its generalization the LogP model. In the postal model a parameter h is used to model the communication latency of the message-passing system. Each node during each round can send a fixed-size message and, simultaneously, receive a message of the same size. Fur...

Regioselective N-alkylation of 4-chloro-2-methoxy-7H-pyrrolo[2,3d]pyrimidine (6) with ethyl 3-bromopropionate under liquid-liquid phase-transfer reaction conditions gave the ester 7a. Its saponification yielded the acid 7b. The logP values of a series of N(9)-functionalized purines and purine isosteres were calculated.

We introduce a model for communication costs in parallel processing environments, called the hyperbolic model, which generalizes two-parameter dedicated-link models in an analytically simple way. The communication system is modeled as a directed communication graph in which terminal nodes represent the application processes and internal nodes, called communication blocks (CBs), re ect the layer...

INTRODUCTION Ex vivo experiments in extracorporeal membrane oxygenation (ECMO) circuits have identified octanol-water partition coefficient (logP, a marker of lipophilicity) and protein binding (PB) as key drug factors affecting pharmacokinetics (PK) during ECMO. Using ovine models, in this study we investigated whether these drug properties can be used to predict PK alterations of antimicrobia...

Let G be a finite p-group, and let G denote the d-th term of the derived series of G . We show, for p > 5, that G 6= 1 implies logp |G | > 2 d + 3d − 6, and hence we improve a recent result by Mann.