RETRIEVAL OF TECHNICAL DOCUMENTS. FINAL SCIENTIFIC REPORT.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	BOHNERT, LEA M.
Format:	Recurso educativo Open Access
Language:	en
Published:	1967
Subjects:	Abstracting Indexing Information Processing Information Retrieval Information Storage Information Theory Libraries Models Operations Research Simulation Systems Analysis Textbooks Translation
Online Access:	Acceder al recurso
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author	BOHNERT, LEA M.
author_facet	BOHNERT, LEA M. BOHNERT, LEA M.
collection	Education Resources Information Center
contents	RETRIEVAL OF TECHNICAL DOCUMENTS. FINAL SCIENTIFIC REPORT. BOHNERT, LEA M. Abstracting Indexing Information Processing Information Retrieval Information Storage Information Theory Libraries Models Operations Research Simulation Systems Analysis Textbooks Translation A RETRIEVAL MODEL WAS DEVELOPED FOR TEACHING AND RESEARCH PURPOSES ON THE BASIS OF VARIED WORK EXPERIENCE AND ANALYSIS OF TECHNICAL DOCUMENT RETRIEVAL AND LIBRARY SERVICES. THE MODEL IS BASED ON SHANNON'S COMMUNICATION MODEL BUT IDENTIFIES THE WOULD BE READER, OR DESTINATION OF RECORDED MESSAGES, AS THE ACTIVATOR OF RETRIEVAL SERVICES. TWO MAIN RETRIEVAL FUNCTIONS ARE SPECIFIED-- IDENTIFYING APPROPRIATE DOCUMENTS UPON REQUEST, AND DELIVERING COPIES OF IDENTIFIED DOCUMENTS. DOCUMENT REQUESTS ARE ANALYZED INTO TWO PARTS, A DESCRIPTION OF DOCUMENT AND A SPECIFICATION OF TYPE OF PHYSICAL ACCESS PREFERRED TO THE REQUESTED DOCUMENT. TO CARRY OUT RETRIEVAL WORK, FOUR KINDS OF RECORDS AND FIVE BASIC OPERATIONS ARE DEFINED. RETRIEVAL PROCESSES, SUCH AS ACQUISITION, INDEXING, AND CIRCULATION, ARE SHOWN TO CONSIST OF VARIOUS COMBINATIONS OF TWO OR MORE OF THE OPERATIONS BEING PERFORMED ON ONE OR MORE KINDS OF RETRIEVAL RECORDS. DATA RETRIEVAL IS SHOWN TO BE A SPECIAL KIND OF DOCUMENT RETRIEVAL. A HISTORY OF EQUIPMENT OF RETRIEVAL INTEREST IS PRESENTED IN A TABULAR FORMAT WITH CITATIONS OF THE APPLICATION OF EACH TYPE OF EQUIPMENT TO RETRIEVAL WORK. THIS DOCUMENT IS AVAILABLE AS AD-664-596 FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VIRGINIA 22151, $3.00 FOR HARD COPY, $0.65 FOR MICROFICHE, 230 PAGES. (AUTHOR)
format	Recurso educativo Open Access
id	eric_ED017303
institution	ERIC Institute of Education Sciences
language	en
publishDate	1967
record_format	eric
spellingShingle	RETRIEVAL OF TECHNICAL DOCUMENTS. FINAL SCIENTIFIC REPORT. BOHNERT, LEA M. Abstracting Indexing Information Processing Information Retrieval Information Storage Information Theory Libraries Models Operations Research Simulation Systems Analysis Textbooks Translation RETRIEVAL OF TECHNICAL DOCUMENTS. FINAL SCIENTIFIC REPORT. BOHNERT, LEA M. Abstracting Indexing Information Processing Information Retrieval Information Storage Information Theory Libraries Models Operations Research Simulation Systems Analysis Textbooks Translation A RETRIEVAL MODEL WAS DEVELOPED FOR TEACHING AND RESEARCH PURPOSES ON THE BASIS OF VARIED WORK EXPERIENCE AND ANALYSIS OF TECHNICAL DOCUMENT RETRIEVAL AND LIBRARY SERVICES. THE MODEL IS BASED ON SHANNON'S COMMUNICATION MODEL BUT IDENTIFIES THE WOULD BE READER, OR DESTINATION OF RECORDED MESSAGES, AS THE ACTIVATOR OF RETRIEVAL SERVICES. TWO MAIN RETRIEVAL FUNCTIONS ARE SPECIFIED-- IDENTIFYING APPROPRIATE DOCUMENTS UPON REQUEST, AND DELIVERING COPIES OF IDENTIFIED DOCUMENTS. DOCUMENT REQUESTS ARE ANALYZED INTO TWO PARTS, A DESCRIPTION OF DOCUMENT AND A SPECIFICATION OF TYPE OF PHYSICAL ACCESS PREFERRED TO THE REQUESTED DOCUMENT. TO CARRY OUT RETRIEVAL WORK, FOUR KINDS OF RECORDS AND FIVE BASIC OPERATIONS ARE DEFINED. RETRIEVAL PROCESSES, SUCH AS ACQUISITION, INDEXING, AND CIRCULATION, ARE SHOWN TO CONSIST OF VARIOUS COMBINATIONS OF TWO OR MORE OF THE OPERATIONS BEING PERFORMED ON ONE OR MORE KINDS OF RETRIEVAL RECORDS. DATA RETRIEVAL IS SHOWN TO BE A SPECIAL KIND OF DOCUMENT RETRIEVAL. A HISTORY OF EQUIPMENT OF RETRIEVAL INTEREST IS PRESENTED IN A TABULAR FORMAT WITH CITATIONS OF THE APPLICATION OF EACH TYPE OF EQUIPMENT TO RETRIEVAL WORK. THIS DOCUMENT IS AVAILABLE AS AD-664-596 FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VIRGINIA 22151, $3.00 FOR HARD COPY, $0.65 FOR MICROFICHE, 230 PAGES. (AUTHOR)
title	RETRIEVAL OF TECHNICAL DOCUMENTS. FINAL SCIENTIFIC REPORT.
topic	Abstracting Indexing Information Processing Information Retrieval Information Storage Information Theory Libraries Models Operations Research Simulation Systems Analysis Textbooks Translation
url	https://eric.ed.gov/?id=ED017303

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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Environment & details:

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Environment Variables empty

Registered Handlers

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