Error message

  • Deprecated function: Return type of DatabaseStatementBase::execute($args = [], $options = []) should either be compatible with PDOStatement::execute(?array $params = null): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2244 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /home/lamsade/www/projets_conf/poc/includes/database/database.inc).
  • Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_random_bytes() (line 2268 of /home/lamsade/www/projets_conf/poc/includes/bootstrap.inc).
  • Deprecated function: Return type of DateObject::__wakeup() should either be compatible with DateTime::__wakeup(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include_once() (line 158 of /home/lamsade/www/projets_conf/poc/sites/all/modules/date/date_api/date_api.module).
  • Deprecated function: Return type of DateObject::format($format, $force = false) should either be compatible with DateTime::format(string $format): string, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include_once() (line 158 of /home/lamsade/www/projets_conf/poc/sites/all/modules/date/date_api/date_api.module).
  • Deprecated function: Return type of DateObject::setTimezone($tz, $force = false) should either be compatible with DateTime::setTimezone(DateTimeZone $timezone): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include_once() (line 158 of /home/lamsade/www/projets_conf/poc/sites/all/modules/date/date_api/date_api.module).
  • Deprecated function: Creation of dynamic property SelectQuery::$alterTags is deprecated in SelectQuery->addTag() (line 978 of /home/lamsade/www/projets_conf/poc/includes/database/select.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in url() (line 2349 of /home/lamsade/www/projets_conf/poc/includes/common.inc).
  • Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in _filter_url_trim() (line 1664 of /home/lamsade/www/projets_conf/poc/modules/filter/filter.module).
  • Deprecated function: Creation of dynamic property SelectQuery::$alterTags is deprecated in SelectQuery->addTag() (line 978 of /home/lamsade/www/projets_conf/poc/includes/database/select.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in _filter_url_trim() (line 1664 of /home/lamsade/www/projets_conf/poc/modules/filter/filter.module).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in url_is_external() (line 2393 of /home/lamsade/www/projets_conf/poc/includes/common.inc).
  • Deprecated function: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in url_is_external() (line 2395 of /home/lamsade/www/projets_conf/poc/includes/common.inc).
  • Deprecated function: ltrim(): Passing null to parameter #1 ($string) of type string is deprecated in url() (line 2311 of /home/lamsade/www/projets_conf/poc/includes/common.inc).
  • Deprecated function: Creation of dynamic property SelectQuery::$alterTags is deprecated in SelectQuery->addTag() (line 978 of /home/lamsade/www/projets_conf/poc/includes/database/select.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property SelectQuery::$alterTags is deprecated in SelectQuery->addTag() (line 978 of /home/lamsade/www/projets_conf/poc/includes/database/select.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1865 of /home/lamsade/www/projets_conf/poc/includes/database/query.inc).

Objectifs du groupe de travail POC

Objectifs du groupe de travail POC "Polyèdres et optimisation combinatoire"

Autour des journées JPOC dont la première édition a eu lieu en 2003, un groupe de chercheurs s’est peu à peu constitués dans l’objectif de promouvoir et de travailler sur le thème de Polyèdres en Optimisation Combinatoire. Tout naturellement, à la proposition de la Roadef, nous avons décidé de tenter l’aventure d’un groupe de travail. Ce groupe est à présent un groupe de l'axe 1 du GDR Recherche Opérationnelle (GDRO RO) du CNRS.

Notre objectif premier est de continuer à organiser et même d’améliorer continuellement les journées annuelles JPOC. Ces journées ont pour but de rassembler la communauté scientifique intéressée par ces thèmes, mais aussi de permettre à des jeunes chercheurs de découvrir ce domaine. C’est pourquoi, un objectif lié aux JPOC est d’organiser des cours "doctoraux" sous la forme de mini-cours de quelques heures, ouverts gratuitement aux jeunes (et peut-être moins jeunes) chercheurs. Organisées une année sur deux, les JPOC sont devenues internationales avec la conférence ISCO qui a lieu à présent en alternance.

Une autre ambition est d’organiser plusieurs fois par an des séances de travail du groupe, que l’on appelle les séminaires du groupe POC, ouverts à tous, mais sur des questions plus ciblées que les JPOC. Au delà d’une succession d’exposés, ces journées ambitionnent d’être un véritable lieu de travail en prévoyant des séances de questions ouvertes, ainsi que du temps et des locaux adaptés à des travaux en petits groupes.

Nous organisons aussi régulièrement des sessions spéciales POC dans diverses conférences et en particuliers à la conférence Roadef.

Le groupe de travail POC a également d’autres objectifs sur ces même thèmes, et venez les construire avec nous!