This paper presents a first look at long-term delay measurements from data connections in 3 Norwegian 3G Networks. We have performed active measurements for more than 6 months from 90 voting locations used in a trial with electronic voting during this fall’s regional elections. Our monitors are geographically spread across all of Norway, and give an unprecedented view of the performance and sta...

??1? An engineering oriented approach for the design of selfsynchronizing stream ciphers is given. To show that it is useful in practice, an actual design is presented and motivated. This SSSC is claimed to be fast (gate delay 2 XORs), cryptographically secure and easily implementable in hardware (standard cells).

| The problem considered is of estimating propagation delays of the transmitted signals in a direct sequence code division multiple access (DS-CDMA) system operating over fading channels. Special attention is given to the near-far problem. An estimator based on subspace identiication techniques is proposed. The Cram er-Rao bound is presented and used as a benchmark when evaluating the performan...

This article introduces the main outcomes of discussions at EDUsummIT 2011 by the specific Technical Working Group on Teacher Professional Development (TWG3). The focus was to explore how professional development of teachers may ensure that teachers are better prepared to use information and communication technology (ICT) to promote 21st century learning. The article is organized into three mai...

This paper shows that TCP Vegas’ fairness critically requires an accurate estimation of propagation delay. We also show that, in practice, this may be difficult to achieve and we discuss how to choose the parameters and that control the window sizes’ update.

Over the years TCP have been designed and developed in the terrestrial network environment where the network propagation delay is in terms of 100ms. Recent advance in communication satellite technologies have introduced networks with longer delay (in terms of 500ms round-trip). This study is to evaluate the performance of TCP over such long-delay networks.

To develop the useful acoustic environmental recognition system, the method of estimating 3D-position of a stationary random acoustic source using bispectral analysis of 4-point detected signals is proposed. The method uses information about amplitude attenuation and propagation delay extracted from amplitude ratios and angles of autoand cross-bispectra of the detected signals. It is expected t...

In this paper, we first define a difference measure between the old and new sequential patterns of stream data, which is proved to be a distance. Then we propose an experimental method, called TPD (Tradeoff between Performance and Difference), to decide when to update the sequential patterns of stream data by making a tradeoff between the performance of increasingly updating algorithms and the ...

Recent educational reforms and research on teacher professional development (TPD) recognizes that if teachers are going to improve their practice, they need to have access to on-going, quality professional development that is situated in their everyday instructional environment that provides opportunities to communicate, collaborate, and reflect on their teaching. Within the last several years,...

The rapid technological advances and innovations of the past few decades have pushed wireless communication from concept to reality. The popularity of wireless communication systems can be seen almost everywhere in the form of cellular networks, WLANs, and WPANs. Packet-switched technology has been demonstrated as effective in cellular radio systems with short propagation delay, not only for da...