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Autore principale:	Luis J. Zaballos
Natura:	Artículo científico
Lingua:	en
Pubblicazione:	Asociación Española para la Inteligencia Artificial 2005
Soggetti:	Ingeniería Scheduling Resource Limitations Constraint satisfaction Flexible manufacturing systems
Accesso online:	https://www.redalyc.org/articulo.oa?id=92526906
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A Constraint Programming Approach to FMS Scheduling. Consideration of Storage and Transportation Resources Luis J. Zaballos Gabriela P. Henning Ingeniería Scheduling Resource Limitations Constraint satisfaction Flexible manufacturing systems Flexible manufacturing systems (FMS) require efficient scheduling strategies to achieve their principal advantage of being able to combine high flexibility with high productivity. This paper presents a novel constraint programming (CP) formulation addressing the FMS scheduling problem for systems that work under the operational policy of part movement. The formulation addresses some critical features found in these problems and proposes a search strategy to speed/up the solution process. This work also presents an ad-hoc procedure, based on different initialisation points, that aims at making problems tractable when their size is big enough to make difficult the attainment of good quality solutions in a reasonable CPU time. 2005 artículo científico 1137-3601 https://www.redalyc.org/articulo.oa?id=92526906 en http://www.redalyc.org/revista.oa?id=925 Inteligencia Artificial. Revista Iberoamericana de Inteligencia Artificial application/pdf Asociación Española para la Inteligencia Artificial Inteligencia Artificial. Revista Iberoamericana de Inteligencia Artificial (España) Num.26 Vol.9

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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