Many tree-based multicast algorithms have been proposed to provide an eecient software implementation on parallel platforms without hardware multicast support. These algorithms are either architecture-dependent (not portable) or architecture-independent (portable) but do not provide good performance when porting to diierent parallel platforms. Based on the LogP model, the proposed parameterized...

We define a set of overhead functions that capture the salient artifacts representing the interaction between parallel application characteristics and architectural features. An execution-driven simulation testbed is used to separate these overheads in a parallel system. Using this testbed and a set of applications, we address two important issues. The first concerns the use of machine abstract...

Activators regenerated by electron transfer (ARGET) atom radical polymerization (ATRP)-based aqueous miniemulsion where the takes place in stabilized monomer droplets is described. In this work, we compared styrene, n-butyl methacrylate (nBMA) and tert-butyl (tBMA) investigated influence of their hydrophobicity on dispersity, molecular weight particle stability based partition coefficients (log...

The work covers synthesis and lipophilicity estimation of several BODIPY dyes. For these compounds, the distribution between 1-octanol water layers is experimentally described corresponding partition coefficients LogP are calculated. experimental values compared with popular fragment-based methods XLopP3, ALogPS, WLogP, SILICOS-IT MLogP. Additionally, hydrophobic polar surface areas found quant...

We present the discovery observations for the optical counterpart of the γ-ray burster GRB 970508 and discuss its light curve in the context of the fireball model. We analyze the HST data for this object, and conclude that any underlying galaxy must be fainter than R = 25.5. We also present a detailed analysis of the HST images of GRB 970228 claimed to show a proper motion of the optical counte...

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...