A basic problem in programming for parallel architectures is that each machine has its own design, and also its own specific software for accessing its hardware features. In 1992, as a response to this situation, the High Performance Fortran Forum (HPFF) was founded, under the guidance of Professor Ken Kennedy, to produce a portable Fortran-based interface to parallel machines for the solution ...

Today’s object-relational DBMSs (ORDBMSs) are designed to support novel application domains by providing an extensible architecture, supplemented by domain-specific database extensions supplied by external vendors. An important aspect of ORDBMSs is support for extensible indexing, which allows the core database server to be extended with external access methods (AMs). This paper describes a new...

Skilled musicians are able to shape a given piece of music (by continuously modulating aspects like tempo, loudness, etc.) to communicate high level information such as musical structure and emotion. This activity is commonly referred to as expressive music performance. The present paper presents another step towards the automatic high-level analysis of this elusive phenomenon with AI methods. ...

.............................................................................................................................. v List of Tables ................................................................................................................... xiii List of Figures .................................................................................................................. x...

In 1993 for the first time a list of the top 500-supercomputer sites worldwide has been made available. The Top500 list allows a much more detailed and well-founded analysis of the state of high performance computing. This paper summarizes some of the most important observations about HPC as seen through the Top500 statistics. The major trends we document here are the continued dominance of the...

From a design and hydraulic standpoint, trays are relatively complex distillation internals. In the ongoing search for higher performance trays, one first must understand the hydraulic and mass transfer aspects of the tray operation such as entrainment, downcomer flooding, and vapor liquid contact. When this is well understood, then various aspects of the deck and/or downcomer designs can more ...

This paper covers the design and performance of a radically new valve system now being used in semi-hermetic compressors. The discharge valve, trademarked the "Discus Valve," is made from a high temperature polymeric material. This valve, together with a unique laminated steel valve plate and a ring-type suction valve, provides large flow areas, low clearance volumes, and high efficiency. The d...

Three generations of Alpha microprocessors have been designed using a proven custom design methodology. The performance of these microprocessors was optimized by focusing on high-frequency design. The Alpha instruction set architecture facilitates high clock speed, and the chip organization for each generation was carefully chosen to meet critical paths. Digital has developed six generations of...

Three generations of Alpha microprocessors have been designed using a proven custom design methodology. The performance of these microprocessors was optimized by focusing on high-frequency design. The Alpha instruction set architecture facilitates high clock speed, and the chip organization for each generation was carefully chosen to meet critical paths. Digital has developed six generations of...