A uniied approach to image focus and defocus analysis (UFDA) was proposed recently for three-dimensional shape and focused image recovery of objects. One version of this approach which yields very accurate results is highly computationally intensive. In this paper we present a parallel implementation of this version of UFDA on the Parallel Virtual Machine (PVM). One of the most computationally ...

We introduce a new nearest-prototype classifier, the prototype vector machine (PVM). It arises from a combinatorial optimization problem which we cast as a variant of the set cover problem. We propose two algorithms for approximating its solution. The PVM selects a relatively small number of representative points which can then be used for classification. It contains 1-NN as a special case. The...

Pneumonia virus of mice (PVM) strain 15 causes fatal pneumonia in mice and provides a convenient model for human respiratory syncytial virus pathogenesis and immunobiology. We prepared PVM mutants lacking the genes for nonstructural proteins NS1 and/or NS2. In Vero cells, which lack type I interferon (IFN), deletion of these proteins had no effect on the efficiency of virus growth. In IFN-compe...

Because of the complexity of distributed applications, understanding their behaviour is a challenging task. Frequently, tools that provide graphical visualizations based on process-time diagrams are provided to facilitate this understanding task. While a wide variety of such tools exist, few address the complexity problem directly. In contrast, our research has focused on the problem of visuali...

This paper describes how the concept of a communication context can be added to the PVM system. Context is a way to partition the communication space so that a message sent within one context cannot be received in a diierent context. This partitioning is essential for the design of robust parallel software libraries. Context can be added to PVM in such a way that existing PVM applications need ...

The nucleotide sequence of the M2 gene of pneumonia virus of mice (PVM) was determined. The sequence showed that the gene encoded a protein of 176 amino acids with a predicted molecular mass of 20165 Da from a major ORF, which is smaller than the equivalent proteins encoded by human, bovine and ovine respiratory syncytial (RS) viruses. The PVM M2 protein is conserved, having 41% similarity to t...

The paper describes a parallel program checkpointing mechanism and its potential application in Grid systems in order to migrate applications among Grid sites. The checkpointing mechanism can automatically (without user interaction) support generic PVM programs created by the PGRADE Grid programming environment. The developed checkpointing mechanism is general enough to be used by any Grid job ...

This paper describes research underway to deene and develop the next generation of PVM (Parallel Virtual Machine). Future versions of PVM will be modular and open so as to allow interoperability with other packages, such as distributed scheduling systems. We concentrate on one aspect of the work: providing virtualization of processors and transparent migration mechanisms within the message-pass...

Message passing libraries such as Parallel Virtual Machine (PVM) and Message Passing Interface (MPI) provide a common Application Programming Interface (API) to implement parallel programs across multiple computers. Such libraries provide a means to program a collection of normally independent computers to work cooperatively on a single computation. However, for programs written in C and Fortra...

PVM and MPI are often compared. These comparisons usually start with the un-spoken assumption that PVM and MPI represent diierent solutions to the same problem. In this paper we show that, in fact, the two systems often are solving diierent problems. In cases where the problems do match but the solutions chosen by PVM and MPI are diierent, we explain the reasons for the diierences. Usually such...