In our Software Defined Radio SDR project we aim at combining two different types of standards, Bluetooth and HiperLAN/2 on one common hardware platform. Goal of our project is to generate knowledge about designing the front end of an SDR system (from the antenna signal to the channel bit stream) where especially an approach from both analog and digital perspective is essential. Bluetooth uses ...

Loop tiling is an effective optimizing transformation to reduce the memory access cost of a program, especially for dense matrix computations. However, the success of loop tiling is heavily dependent on the appropriate selection of tile shapes and sizes. In this paper we examine several existing tile selection algorithms in a unified framework, and quantify their performance improvements for th...

We outline three known algorithms for relational division, the algebra operator used to express universal quantification (for-all conditions), and a new algorithm called Hash-Division. By comparing the algorithms analytically and experimentally, we show that the new algorithm provides performance competitive or superior to techniques used to-date, namely techniques using sorting or aggregate fu...

StarBED is a network testbed begun in 2002 focused on running actual program code for software and hardware implementations. As hardware technologies develops, its facilities such as PCs and network equipments have been updated and we additionally developed SpringOS, a software support suite consisting of numerous program modules. The performance of StarBED and SpringOS increases as their equip...

A class of primal dual interior point methods is developed These methods use a higher order Taylor polynomial to approximate a primal dual trajectory de ned from an infeasible point A detailed implementation of these methods is given and their computational performance is studied We give computational results for two di erent approaches for de ning trajectory and using up to th order polynomial...

Topic driven crawlers can complement search engines by targeting relevant portions of the Web. A topic driven crawler must exploit the information available about the topic and its underlying context. In this paper we extend our previous research on the design and evaluation of topic driven crawlers by comparing seven different crawlers on a harder problem, namely, seeking highly relevant targe...

deeply conscious of the honor you have bestowed upon me as a surgeon in asking me to give this lecture. Although modesty is not a quality with which surgeons are generally overendowed, I would like to accept it as a tribute to my colleagues both medical and surgical who work with me at Guy's and National Heart Hospitals in London. In fact, teamwork is the feature which has characterized modern ...

While ideally noise should be reduced at the source, in the military environment the most effective solution in terms of both cost and operational effectiveness has been to provide personnel with personal hearing protection. This protection may be in the form of either an earplug that occludes the ear canal or a circumaural protector that inserts a barrier between the ambient noise and the ear....

Multiple Access protocols are distributed algorithms that enable a set of geographically dispersed stations to communicate using a single, common, broadcast channel. We concentrate on the class of Conflict Resolution Algorithms. This class exhibits very good performance characteristics for ‘‘bursty’’ computer communications traffic, including high capacity, low delay under light traffic conditi...