Project INTREX. Semiannual Activity Report, 15 September 1967 to 15 March 1968.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Format:	Recurso educativo Open Access
Language:	en
Published:	1968
Subjects:	Computers Display Systems Indexing Information Processing Information Retrieval Information Storage Information Systems Libraries Man Machine Systems Microfilm
Online Access:	Acceder al recurso
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collection	Education Resources Information Center
contents	Project INTREX. Semiannual Activity Report, 15 September 1967 to 15 March 1968. Computers Display Systems Indexing Information Processing Information Retrieval Information Storage Information Systems Libraries Man Machine Systems Microfilm Project Intrex is a program of experiments intended to provide a foundation for the design of future information transfer systems, with the library of the future visualized as a computer-managed communications network. In order to discover the necessary facts, especially in the area of the user's interaction with the system, experimentation is being conducted in the environment of an operating library as well as in the laboratory. The initial efforts have been concentrated on the problems of access--bibliographic access through an augmented catalog, and access to full text. The efforts during the six months covered in this report have concentrated on the implementation of the experimental library information storage and retrieval system. The configuration of the initial system is defined in detail and the objective now is to bring it to a state in which it can be tested and evaluated as a complete system. This report presents details of progress being made on the development of (1) the augmented catalog of at least 10,000 journal articles, reports and theses in selected areas of materials science and engineering; (2) the augmented-catalog display console; (3) the storage and retrieval programs; and (4) the full-text-access system. (Author/JB)
format	Recurso educativo Open Access
id	eric_ED036298
institution	ERIC Institute of Education Sciences
language	en
publishDate	1968
record_format	eric
spellingShingle	Project INTREX. Semiannual Activity Report, 15 September 1967 to 15 March 1968. Computers Display Systems Indexing Information Processing Information Retrieval Information Storage Information Systems Libraries Man Machine Systems Microfilm Project INTREX. Semiannual Activity Report, 15 September 1967 to 15 March 1968. Computers Display Systems Indexing Information Processing Information Retrieval Information Storage Information Systems Libraries Man Machine Systems Microfilm Project Intrex is a program of experiments intended to provide a foundation for the design of future information transfer systems, with the library of the future visualized as a computer-managed communications network. In order to discover the necessary facts, especially in the area of the user's interaction with the system, experimentation is being conducted in the environment of an operating library as well as in the laboratory. The initial efforts have been concentrated on the problems of access--bibliographic access through an augmented catalog, and access to full text. The efforts during the six months covered in this report have concentrated on the implementation of the experimental library information storage and retrieval system. The configuration of the initial system is defined in detail and the objective now is to bring it to a state in which it can be tested and evaluated as a complete system. This report presents details of progress being made on the development of (1) the augmented catalog of at least 10,000 journal articles, reports and theses in selected areas of materials science and engineering; (2) the augmented-catalog display console; (3) the storage and retrieval programs; and (4) the full-text-access system. (Author/JB)
title	Project INTREX. Semiannual Activity Report, 15 September 1967 to 15 March 1968.
topic	Computers Display Systems Indexing Information Processing Information Retrieval Information Storage Information Systems Libraries Man Machine Systems Microfilm
url	https://eric.ed.gov/?id=ED036298

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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