The Complexity of Mean Flow Time Scheduling Problems with Release Times

We study the problem of preemptive scheduling n jobs with given release times on m identical parallel machines. The objective is to minimize the average flow time. We show that when all jobs have equal processing times then the problem can be solved in polynomial time using linear programming. Our algorithm can also be applied to the open-shop problem with release times and unit processing times. For the general case (when processing times are arbitrary), we show that the problem is unary NP-hard.Comment: Subsumes and replaces cs.DS/0412094 and "Complexity of mean flow time scheduling problems with release dates" by P.B, S.

Developing an experimental challenge model for gill disease caused by gelatinous zooplankton

Harmful zooplankton, such as jellyfish or cnidarians, play an important role in gill disease development, but there is a lack of scientific and technical understanding of the interactions between gelatinous zooplankton and fish gills that can only be obtained through a lab-based challenge model using lab-reared organisms. Such a model does not exist, so we set out to develop one. We were able to produce a pre-determined quantity of gelatinous zooplankton at a pre-determined point in time, transport them, and challenge salmon with these live gelatinous zooplankton, and present initial results. Currently we are optimizing the model. When developed further, the model is intended to be used as a tool to improve understanding of the role of gelatinous zooplankton in gill disease, identify host responses and assess techniques to mitigate the effects of gelatinous zooplankton on gill health

Developing an experimental challenge model for gill disease caused by gelatinous zooplankton

Harmful zooplankton, such as jellyfish or cnidarians, play an important role in gill disease development, but there is a lack of scientific and technical understanding of the interactions between gelatinous zooplankton and fish gills that can only be obtained through a lab-based challenge model using lab-reared organisms. Such a model does not exist, so we set out to develop one. We were able to produce a pre-determined quantity of gelatinous zooplankton at a pre-determined point in time, transport them, and challenge salmon with these live gelatinous zooplankton, and present initial results. Currently we are optimizing the model. When developed further, the model is intended to be used as a tool to improve understanding of the role of gelatinous zooplankton in gill disease, identify host responses and assess techniques to mitigate the effects of gelatinous zooplankton on gill health

Developing an experimental challenge model for gill disease caused by gelatinous zooplankton

Harmful zooplankton, such as jellyfish or cnidarians, play an important role in gill disease development, but there is a lack of scientific and technical understanding of the interactions between gelatinous zooplankton and fish gills that can only be obtained through a lab-based challenge model using lab-reared organisms. Such a model does not exist, so we set out to develop one. We were able to produce a pre-determined quantity of gelatinous zooplankton at a pre-determined point in time, transport them, and challenge salmon with these live gelatinous zooplankton, and present initial results. Currently we are optimizing the model. When developed further, the model is intended to be used as a tool to improve understanding of the role of gelatinous zooplankton in gill disease, identify host responses and assess techniques to mitigate the effects of gelatinous zooplankton on gill health

The earliness-tardiness job-shop scheduling problem

International audienc

Contributions à l'étude et à la résolution de problèmes d'ordonnancement disjonctif

PARIS-BIUSJ-Thèses (751052125) / SudocCentre Technique Livre Ens. Sup. (774682301) / SudocPARIS-BIUSJ-Mathématiques rech (751052111) / SudocFONTAINEBLEAU-MINES ParisTech (771862302) / SudocSudocFranceF

Développement du système digestif de la daurade royale sparus aurata

L'auteur décrit dans un premier temps l'aquaculture méditerranéenne et plus spécifiquement celle de la daurade royale. Les techniques d'élevage en grossissement et en écloserie sont présentées. Les perspectives de développement économique et d'évolutions techniques sont envisagées. L'ontogenèse de S. aurata est décrite dans un second temps. L'attention est focalisée sur le système digestif de la prélarve, de la larve et enfin du juvénile. Les aspects morphoanatomiques, histologiques, ultrastructuraux et biochimiques sont développés et mis en corrélation avec la physiologie digestive des larves. L'auteur montre en quoi la connaisance et la compréhension du développement du système digestif des larves de daurade sont essentielles pour envisager l'application des perspectives d'améliorations aux protocoles d'élevage larvaire existants.BANYULS/MER-Observ.Océanol. (660162201) / SudocRENNES-Agrocampus-Bibl. Linné (352382308) / SudocNANTES-Ecole Nat.Vétérinaire (441092302) / SudocSudocFranceF