Optical and near-IR observations of SN 1998bw

SN 1998bw, especially after the discovery of GRB 030329/SN 2003dh, seems to be the equivalent of the Rosetta stone for the SN/GRB connection. In this paper I review optical and near IR observations that have been carried out for this uncanny object, which has probably confirmed suspicions and ideas originally formulated in the early seventies of last century.Comment: 9 pages, 7 figures. Invited review to the IAU Colloquium n. 192, SUPERNOVAE: ten years of SN 1993J, Valencia (Spain

Multi-objective evolutionary approach for the satellite payload power optimization problem

International audienceToday’s world is a vast network of global communicationssystems in which satellites provide high-performanceand long distance communications. Satellites are able to forwardsignals after amplification to offer a high level of serviceto customers. These signals are composed of many differentchannel frequencies continuously carrying real-time data feeds.Nevertheless, the increasing demands of the market force satelliteoperators to develop efficient approaches to manage satellite configurations,in which power transmission is one crucial criterion.Not only the signal power sent to the satellite needs to be optimalto avoid large costs but also the power of the downlink signalhas to be strong enough to ensure the quality of service. In thiswork, we tackle for the first time the bi-objective input/outputpower problem with multi-objective evolutionary algorithms todiscover efficient solutions. A problem specific indirect encodingis proposed and the performance of three state-of-the-art multiobjectiveevolutionary algorithms, i.e. NSGA-II, SPEA2 andMOCell, is compared on real satellite payload instances