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Detalles Bibliográficos
Autor principal:	Juan Guillermo Rivera-Berrío
Formato:	Artículo científico
Lenguaje:	es
Publicado:	Instituto Tecnológico Metropolitano 2007
Materias:	Ingeniería Riesgo Probabilidad Incertidumbre
Acceso en línea:	https://www.redalyc.org/articulo.oa?id=344234312002
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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La Borrosa Distinción Riesgo-Incertidumbre Juan Guillermo Rivera-Berrío Ingeniería Riesgo Probabilidad Incertidumbre Este artículo hace parte de una investigación más amplia entorno a los problemas asociados al riesgo. Los resultados de lainvestigación presentados se enmarcan en el problema de la polisemiapresente en las palabras que representan conceptos comoincertidumbre, riesgo y probabilidad.Se presentan tres posturas que hacen de la distinción riesgoincertidumbreun problema duro de resolver. Una primera posturaes no distinguir entre riesgo e incertidumbre, propio de los que hedenominado científicos sociales; otra, es definir el riesgo como unacategoría de incertidumbre en la cual se habla de grados de incertidumbre;y la tercera postura, que es la que defiendo, es discernirentre incertidumbre y riesgo. Por contraste con la segunda postura,propongo un concepto de riesgo que se construye desde el conocimientopor grado, es decir, el riesgo como grado de conocimiento.Al estar asociado el riesgo al concepto de probabilidad, mostraréun concepto de riesgo más cercano a los denominados grados decreencia, no como probabilidades, sino como "posibilidades"2• 2007 artículo científico 0123-7799 https://www.redalyc.org/articulo.oa?id=344234312002 es http://www.redalyc.org/revista.oa?id=3442 TecnoLógicas application/pdf Instituto Tecnológico Metropolitano TecnoLógicas (Colombia) Num.19

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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