A new species of Espeletia from the Páramo de Presidente in northeastern Colombia is described. The species is named Espeletia praesidentis after the name of the páramo, and it is dedicated to the President Juan Manuel Santos, for his persistent efforts in working for peace for Colombia. The new species is closely related to Espeletia dugandii, but differs in the shape and colour of the leaves ...

While the number of machine readable information accessible via the World Wide Web is growing, the digital divide problem caused by various barriers has of late become crucial. This paper describes research examples and projects of information access aimed to overcome barriers associated with human languages.

Addressing the challenge of packet transmission in a wireless soft real-time system, we present ve splitting protocols that take packet deadlines into account. With them, connectionless service with real-time QoS guarantees at the MAC layer can be ooered. Three protocols are blocked access and two are free access algorithms. Mathematical models are developed and results compared with simulation...

This paper examines the constraints that mediate the ability of individuals in developing country contexts to benefit from Information and Communication Technologies (ICTs). We identify social constraints, such as low levels of education and literacy rates, as making it difficult to access ICTs. We outline a potential way to address these constraints with a text free user interface (UI) design ...

The simultaneous access to several vectors is typical in vector multiprocessors. When these accesses are performed in an asynchronous manner, collisions in the network and the conflicts in the memory modules produce high latencies that reduce the efficiency of the system. In this paper we propose a block-interleaved storage scheme to store streams as well as a synchronized out-of-order access m...

In this paper, we present a collision-free asynchronous multi-channel access protocol for Ad Hoc wireless networks using a single transceiver. Our protocol, dubbed AMMAC for Asynchronous Multi-channel Medium Access Control, targets low-cost and low-power deployments where nodes are equipped with a single transceiver. Other distinguishing features of AM-MAC include its simplicity and the fact th...

Internet has profoundly changed the way scientific research is carried out. This in turn has altered our attitudes concerning access to scientific information. In this article we review a number of recent initiatives in various fields of science. We argue that the scientists in general, and mathematicians in particular, should actively support a transition towards free access to scientific lite...

The paper presents a novel static algorithm for mapping values to multiple register files. The algorithm is based on the edge-coloring of a bipartite graph. It allows the migration of values among the register files to keep the number of RAMs as small as possible. By comparison with the register file design used in the Cydra 5 mini-supercomputer, our approach substantially reduces the number of...

Dr Hilary Rono shudders to think what life for him and his colleagues in the medical profession — particularly in developing countries — was like before the Internet. Rono is just about to complete his masters degree in ophthalmology at the University of Nairobi. The Internet has been key to his studies, especially the Health InterNetwork Access to Research Initiative (HINARI). The WHO programm...