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The failure of CSMA in emerging wireless network scenarios

The current family of 802.11 protocols are based on the Carrier Sense Multiple Access (CSMA) mechanism which is a simple and robust means of sharing a channel. However, two current trends in wireless networks point towards a situation where CSMA fails to perform better than pure random access solutions such as ALOHA. The first trend is the ever increasing raw data rate in each generation of 802.11

Crafting Cultural Heritage

The making of artefacts is a core activity in society, the result of which contributes to the building up of our physical surroundings and material culture. Throughout history, craft skills have been highly appreciated and have often been seen as crucial component of a capable human. Despite this, the knowledge base that constitutes the actual making is often overlooked in research. In this sessio

Model-Based Course Assessment – Principles and Practice

This paper presents the concepts of model-based course assessments. This involves a mathematical model to define the grading scheme of a course, based on a set of items to be scored. We report lessons learned from using this approach. An important conclusion is that model-based assessment promotes clear definitions of assessment criteria.

Using circumventing media to counteract authoritarian regimes.

The purpose of this paper is to reflect on how potential circumventing media and communication technologies could potentially assist the information flow when authoritarian regimes decide to block the main channels, such as the Internet and the mobile phone networks. The point of departure is the recent Internet blackouts in countries in the Middle East and North Africa (MENA), such as Egypt, Bahr

Experimental Techniques and Data Treatment for Studying the Dynamics of Ethanol Production/Consumption in Baker's Yeast

The dynamics of ethanol production/consumption in baker's yeast were studied under feed- rate controlled conditions. The yeast was grown on molasses in an 8-l fed-batch reactor and experiments were done at cell concentrations between 5 and 65 g l−1. Small changes in the feed rate were made around a feed rate corresponding to the critical growth rate, at which the yeast cell metabolism switches bet