We compute the Bieri-Neumann-Strebel-Renz geometric invariants, Σn, of the lamplighter groups Lm by using the Diestel-Leader graph DL(m,m) to represent the Cayley graph of Lm.

A new methodology for clock-jitter simulation in continuous-time sigma-delta (Σ∆) converters is proposed. This analysis method, based on a previously published method uses a discrete time simulator, more efficient than an analog simulator. Only one sample per output sample is required, which reduces simulation times to a few seconds, even for large simulations. Results will be compared to those...

The importance of Linked Open Data (LOD) has not yet been recognized by ordinary people. As the effort to involve them into LOD activity, we have developed Yokohama Art Spot, a mash-up application on local museum information to demonstrate the value of information sharing and reuse where data from different communities are used together. Thanks to the flexibility of LOD, it provides useful view...

The aim of this article is to present “a closer look” at the management theory of “Six Sigma Quality” and to contrast it with the management theory of Dr. W. Edwards Deming. This paper will offer a perspective that the critical differences between “Six Sigma Quality” and the teachings of Dr. Deming are not technical, but rather philosophical in nature. This explanation briefly compares the tech...

Two digital techniques are described in this tutorial, both aimed at improving the accuracy of delta-sigma data converters. The first one corrects adaptively for mismatch errors in a MASH ADC, while the other acquires and then corrects for the nonlinearity of the intemal multibit DAC used in the ADC.

..........................................................................................................................................i Acknowledgements....................................................................................................................iii List of Tables..............................................................................................................

Continuous-time ∆Σ modulators are able to operate at higher frequencies than their discrete-time counterparts. However, they suffer more severely from non-idealities such as clock jitter and excess loop delay. The effects of these two non-idealities are explained and a continuous-time to discrete-time conversion method is presented in order to aid in the analysis of these non-idealities. Two ci...

v Preface vii Contributions xi Abbreviations xiii Acknowledgments xv

A Personal Learning Environment (PLE) is a mash-up of learning services. It enables students and teachers to assemble a work environment that is adapted to a domain and specific individual needs. In this article, we report on our experiences on using a PLE for Language Learning in five French lectures at the Shanghai Jiao Tong University Continuing Education School. We found that while a PLE ha...