Information Gathering And Disseminating Activities of the National Library of Medicine.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Format:	Recurso educativo Open Access
Language:	en
Published:	1970
Subjects:	Computer Programs Information Dissemination Information Needs Information Retrieval Information Storage Information Systems Medical Libraries Relevance (Information Retrieval)
Online Access:	Acceder al recurso
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collection	Education Resources Information Center
contents	Information Gathering And Disseminating Activities of the National Library of Medicine. Computer Programs Information Dissemination Information Needs Information Retrieval Information Storage Information Systems Medical Libraries Relevance (Information Retrieval) The National Library of Medicine maintains a computerized analysis and retrieval system and administers various programs for collecting, publishing, disseminating, and exchanging medical health information. A major use of the library's computer is to prepare bibliographies of biomedical subjects requested by medical schools, researchers, practitioners, public health officials, and other health professionals. The library is encountering problems responding to such requests. About 2 to 4 weeks is required to process requests, and library officials believe that the requests should be processed in a much shorter time. The longer time presently required is due to the relative slowness inherent in the computer's storage and retrieval system. Limitations in the computer's vocabulary, inconsistency in indexing procedures, and errors by the people who do the searching have resulted in data that is not responsive to the requests. (Author/MM)
format	Recurso educativo Open Access
id	eric_ED051820
institution	ERIC Institute of Education Sciences
language	en
publishDate	1970
record_format	eric
spellingShingle	Information Gathering And Disseminating Activities of the National Library of Medicine. Computer Programs Information Dissemination Information Needs Information Retrieval Information Storage Information Systems Medical Libraries Relevance (Information Retrieval) Information Gathering And Disseminating Activities of the National Library of Medicine. Computer Programs Information Dissemination Information Needs Information Retrieval Information Storage Information Systems Medical Libraries Relevance (Information Retrieval) The National Library of Medicine maintains a computerized analysis and retrieval system and administers various programs for collecting, publishing, disseminating, and exchanging medical health information. A major use of the library's computer is to prepare bibliographies of biomedical subjects requested by medical schools, researchers, practitioners, public health officials, and other health professionals. The library is encountering problems responding to such requests. About 2 to 4 weeks is required to process requests, and library officials believe that the requests should be processed in a much shorter time. The longer time presently required is due to the relative slowness inherent in the computer's storage and retrieval system. Limitations in the computer's vocabulary, inconsistency in indexing procedures, and errors by the people who do the searching have resulted in data that is not responsive to the requests. (Author/MM)
title	Information Gathering And Disseminating Activities of the National Library of Medicine.
topic	Computer Programs Information Dissemination Information Needs Information Retrieval Information Storage Information Systems Medical Libraries Relevance (Information Retrieval)
url	https://eric.ed.gov/?id=ED051820

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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