Reproducible Testing of Distributed Software with Middleware Virtualization and Simulation

in Ur, Shmuel (Ed.) Proceedings of the 6th Workshop on Parallel And Distributed systems: Testing, Analysis, and Debugging (2008, June 20)

P2P Grids are Grids organized into P2P networks where participant exchange computing time so as to complete computational tasks. Evaluating the performance of scheduling algorithms enables one to deploy ... [more ▼]

P2P Grids are Grids organized into P2P networks where participant exchange computing time so as to complete computational tasks. Evaluating the performance of scheduling algorithms enables one to deploy those that are efficient. Performance is often evaluated experimentally or through simulation because these algorithms (typically heuristics) are too complex to model analytically. Testing the implementation of P2P Grid middleware before it is deployed is also important: Reproducing configurations or conditions that lead to unexpected outcomes is thus valuable. A P2P Grid environment exhibits multiple sources of failure and is typically dynamic and uncontrollable. Reproducing even basic behavior of Grid nodes in a controllable and repeatable manner is thus exceedingly difficult. Such lack of control over the environment is a major challenge in the software engineering of P2P Grid middleware. Simulators have been proposed to evaluate the performance of scheduling algorithms, but are often limited in scope, reusability and accuracy, i.e. they rely on simplified models. We introduce a software engineering pattern - that we call code once, deploy twice - to both reduce the distance between simulated and implemented algorithms and reproduce, at will, Grid configurations and environments: A simulator implementation of a Grid architecture is built by virtualizing its middleware implementation. An immediate benefit is that most of the code can be reused between both implementations; only communications between Grid nodes, multithreading within Grid nodes and actual task execution are coded differently. As a derived benefit, most of the code of the middleware can be tested within the controlled environment of the simulator, before it is deployed as-is. Another benefit is high simulation accuracy. We describe the implementation of a P2P Grid following the code once, deploy twice pattern, that we believe is also relevant to other Grid types (certainly Volunteer Grids and Desktop Grids, and possibly Globus-based Grids). [less ▲]

Reproductibilité, faux parfaits et contrefaçons: entre fétichisme artistique et gout esthétique

in Nouveaux Actes Sémiotiques (2007, January 31)

Ce travail analyse la relation entre le jugement esthétique qui catégorise quelque chose comme Kitsch et l’authenticité et/ou la reproductibilité des objets, c’est-à-dire leur histoire de production. J’ai ... [more ▼]

Ce travail analyse la relation entre le jugement esthétique qui catégorise quelque chose comme Kitsch et l’authenticité et/ou la reproductibilité des objets, c’est-à-dire leur histoire de production. J’ai analysé les procédures de « Kitschification » et les conditions à travers lesquelles se forment et se justifient certains jugements de goût à une certaine période et dans une certaine culture. En partant de la distinction du philosophe Nelson Goodman entre « arts autographiques » et « arts allographiques » j’ai pris en considération le cas du Parthénon de Nashville, monument qui se présente comme la reconstruction du Parthénon d’Athènes, et qui apparaît comme une œuvre plus parfaite et donc plus « originale » de l’original lui-même. Cette analyse démontre que le jugement de goût ne peut pas renvoyer à la simple configuration textuelle d’un objet et donc à ses caractéristiques morphologiques, et que le jugement de goût dépend par contre de l’insertion spatio-temporelle (intertextuelle et interculturelle) de l’objet pris en considération. Dans cet article j’ai également analysé les notions d’aura (Benjamin), de patine, outre celles d’autographie et d’allographie par rapport aux arts architectural et pictural. [less ▲]

Reproduction artificielle réussie de Labeo bicolor et de Labeo frenatus.

in Revue Française d'Aquariologie (1988), 15(2), 39-41

Reproduction chez nos poissons.

Book published by Nelles imprimeries Havaux - Fédération sportive des Pêcheurs Francophones (1996)

La reproduction des poissons de nos rivières : commentaire de film

Article for general public (1996)

Reproduction et régénération naturelle de l'iroko, Milicia excelsa (Welw.) C. C. Berg, au sud-est du Cameroun

Poster (2010, March)

Reproduction in the endangered African wild dog: basic physiology, reproductive suppression and possible benefits of artificial insemination

in Animal Reproduction Science (2012), 133

Reproduction of Lesions and Clinical Signs with a Cnf2-Producing Escherichia Coli in Neonatal Calves

in Advances in Experimental Medicine and Biology (1999), 473

CNF2-producing necrotoxigenic E. coli (NTEC2) are associated with diarrhoea and septicaemia in calves. We orally inoculated neonatal calves with a NTEC2 strain in order to reproduce clinical signs and ... [more ▼]

CNF2-producing necrotoxigenic E. coli (NTEC2) are associated with diarrhoea and septicaemia in calves. We orally inoculated neonatal calves with a NTEC2 strain in order to reproduce clinical signs and lesions. We observed diarrhoea in each inoculated calf, bacteraemia (80%), the presence of CNF2+ bacteria in the lungs (80%) and in the liver (20%). The observed lesions were inflammation of the entire gut, hypertrophy of the mesenteric lymph nodes and hepatisation of the lungs. We were unable to detect characteristic lesions that are classical signs of septicaemia. [less ▲]

Reproduction performances of Belgian Blue cattle in Wallonia

Conference (2011, September 09)

Reproductive and productive performances of the stress-negative Piétrain pigs in the tropics: the case of Vietnam

in Animal Production Science (2013), 53(2), 173-179

The objective of the present study is to investigate the reproduction, production and semen traits of the stressnegative Piétrain line of pigs in the north of Vietnam, as well as to identify various ... [more ▼]

The objective of the present study is to investigate the reproduction, production and semen traits of the stressnegative Piétrain line of pigs in the north of Vietnam, as well as to identify various factors (halothane genotype, generationorigin, parity, sex and month of the year) acting on these traits. The experiment was carried out on a purebred nucleus on Dong Hiep farm, Haiphong province in Vietnam. The reproduction performances and the sperm quality measures were based on 12 sows and 5 boars imported from Belgium as well as on 29 sows and 14 boars born in Vietnam, while the production performances were recorded only from 251 animals born in Vietnam. No significant differences were observed between halothane genotypes of sows for reproduction traits (P>0.0578). At the age of 7.5 months, bodyweight, backfat thickness and longissimus depth (7.5) of homozygous-dominant pigs were higher (P<0.05) than in heterozygotes. Homozygous-dominant boars had higher total number of spermatozoa than heterozygote boars (P < 0.05); similarly, Vietnam boars also presented higher total number of spermatozoa values than Belgium boars (P < 0.001). Vietnam sows had longer duration of pregnancy, more piglets born alive and heavier litter weight of weaning than Belgium sows (P < 0.01). Bodyweight at birth, at weaning, at 2, 5.5 and 7.5 months of age increased from the first to third parity (P < 0.05). Gilts had more lean meat than intact boars (P < 0.01). Compared with observations made in temperate countries, the reproduction and production performances, sperm concentration and total number of spermatozoa of stress-negative Piétrain pigs were reduced, whereas lean meat percentage was not affected. This might be due to the different climate, although improving values for animals born in Vietnam might indicate adaptation of the animals and/or of the technicians with that breed. The results support the interest of the use of this new Piétrain line in tropical countries with ecological and climatic conditions similar to Vietnam. [less ▲]