This paper addresses the development of macromodels for input and output ports of a digital device. The proposed macromodels consist of parametric representations that can be obtained from port transient waveforms at the device ports via a well established procedure. The models are implementable as SPICE subcircuits and their accuracy and efficiency are verified by applying the approach to the ...

A combination of new compression methods is suggested in order to compress the concordance of a large Information Retrieval system. The methods are aimed at allowing most of the processing directly on the compressed file, requesting decompression, if at all, only for small parts of the accessed data, saving I/O operations and CPU time.

In this paper, a volume management scheme that supports multi-host environments is designed and implemented. The proposed scheme provides various features for enterprise internet services such as online resizing, online migration and an enhanced configuration scheme considering workload access patterns and disk geometry. The SANfs is a shared file system in which multiple hosts can share multip...

The wide availability of cloud computing offers an unprecedented opportunity to rethink how we construct applications. The cloud is currently mostly used to package up existing software stacks and operating systems (e.g. LAMP) for scaling out websites. We instead view the cloud as a stable hardware platform, and present a programming framework which permits applications to be constructed to run...

In this paper we present a paradigm for solving external-memory problems, and illustrate it by algorithms for matrix multiplication, sorting and list ranking. Our paradigm is based on the use of BSP algorithms. The correspondence is almost perfect, and especially the notion of x-optimality carries over to algorithms designed according to our paradigm. The advantages of the approach are similar ...

Even traditional commercial database systems do not scale to the size of today’s large scientific data sets, whose growth is outpacing Moore’s Law. Instead, scientists are wedded to special-purpose data formats and their associated I/O libraries, even though these libraries provide only basic functionality. Thus there is a need for a scalable data management system that can support these format...

Achieving high performance for distributed I/O on a wide-area network continues to be an elusive holy grail. Despite enhancements in network hardware as well as software stacks, achieving high-performance remains a challenge. In this paper, our worldwide team took a completely new and non-traditional approach to distributed I/O, called ParaMEDIC: Parallel Metadata Environment for Distributed I/...

Emerging scientific workflows in HPC focus more on analysis rather than simulation. Simulation output is so dense with information that copious amounts of analysis must be performed on a single output to understand the results of that simulation. We identify this repetitive analysis as a new application type, Simulate Once Analyze Repeatedly (SOAR) Computing. Current scientific HPC, when extend...

This paper presents an ontology-based Virtual Factory tool to support the 3D design of factories. The official ifcOWL is the reference ontology that was adopted to develop the I/O software connector of the tool. The key advantage of the ontology interface is represented by the easy integration with other software tools that can either use the layout generated by GIOVE-VF or provide information ...

Using magnetic disks as a cache for tertiary storage has been shown to be an effective way to address the high storage costs of large-scale multimedia servers. We investigate a technique for managing the bandwidth of such a hierarchical storage design. In existing schemes, all data items are treated equally; and the same I/O rate is used to load data from tertiary storage when they are requeste...