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Database Queries in Java

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Critical Sections: Re-Emerging Scalability Concerns for Database Storage Engines

Anastasia Ailamaki, Frederick Ryan Johnson, Ippokratis Pandis

Critical sections in database storage engines impact performance and scalability more as the number of hardware contexts per chip continues to grow exponentially. With enough threads in the system, some critical section will eventually become a bottleneck. ...

2008

Automated inspection of microlens arrays

Heinz Hügli

Industrial inspection of micro-devices is often a very challenging task, especially when those devices are produced in large quantities using micro-fabrication techniques. In the case of microlenses, millions of lenses are produced on the same substrate, t ...

2008

Classifying Materials in the Real World

Barbara Caputo

Classifying materials from their appearance is challenging. Impressive results have been obtained under varying illumination and pose conditions. Still, the effect of scale variations and the possibility to generalize across different material samples are ...

IDIAP2007

Design tools for large networks

Bryn Andrew Martin

The Atlas TDAQ network consists of four separate networks which together total over 8000 ports at 1 Gbit/s, 60 ports at 10 Gbit/s, 200 Ethernet switches at the edge of the network, 6 multi-blade chassis switches at the core and over 20 km of copper and fib ...

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To Share or Not To Share?

Anastasia Ailamaki, Babak Falsafi, Frederick Ryan Johnson, Ippokratis Pandis

Intuitively, aggressive work sharing among concurrent queries in a database system should always improve performance by eliminating redundant computation or data accesses. We show that, contrary to common intuition, this is not always the case in practice, ...

2007

Degradation Processes and Wear of Railway Switches and Crossings: The Swiss Experience

Willem-Jan Zwanenburg

Using databases of the Swiss Federal Railways (SBB), statistical analyses are carried out on the expected lifetime of railway switches (points) and crossings (components). They are attributed to different parameters which influence the speed of degradation ...

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Multi-stream Features Combination based on Dempster-Shafer Rule for LVCSR System

Hynek Hermansky, Fabio Valente

This paper investigates the combination of two streams of acoustic features. Extending our previous work on small vocabulary task, we show that combination based on Dempster-Shafer rule outperforms several classical rules like sum, product and inverse entr ...

2007

Multi-stream Features Combination based on Dempster-Shafer Rule for LVCSR System

Hynek Hermansky, Fabio Valente

IDIAP2007

Efficient Semi-structured Queries in Scala using XQuery Shipping

This project proposes a new approach to interact with database systems through programming languages. A formal query language can be integrated within modern programming languages and the semi-structured queries can be evaluated using automatic transformat ...

2006

Queryll: Java Database Queries through Bytecode Rewriting

Willy Zwaenepoel, Christopher Ming-Yee Iu

When interfacing Java with other systems such as databases, programmers must often program in special interface languages like SQL. Code written in these languages often needs to be embedded in strings where they cannot be error-checked at compile-time, or ...

2006