Videotex Applications in the Technical Information Service. Research Notes 115.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Vesterinen, Pirjo, Grohn, Inga-Leena
Format:	Recurso educativo Open Access
Language:	en
Published:	1982
Subjects:	Databases Delivery Systems Information Dissemination Information Retrieval Information Services Information Systems Online Systems Program Evaluation Videotex
Online Access:	Acceder al recurso
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Selective Dissemination of Microfiche Documents in a University Setting: Phase 1. Final Report. Project CLR-561.
by: Meredith, Joseph C.
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Videotex--The Library of the Future.
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British Library Conducts New Technology Research.
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Remote Electronic Delivery of Information Through Libraries.
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Science-Oriented and MARC II Tape Services
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Telidon: A Videotext System.
by: Emmens, Carol A.
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New and Emerging Technologies for Information Delivery.
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Published: (1982)

Videotex and Teletext: New Roles for Libraries.
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Electronic Publishing--A View From the Library.
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Educational Information Utilities: Assessing the Potential.
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Progress Report of Computerized I&D Services at the Royal Institute of Technology, Stockholm.
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First Montreal Workshop on Videotex Technology. Document de travail #112.
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Delivering an Alternative Medicine Resource to the User's Desktop via World Wide Web.
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Numeric Databases in the 80s.
by: Fried, John B., et al.
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Riding the Electronic Wave--Document Delivery: Proceedings of the Library of Congress Network Advisory Committee Meeting (Washington, D.C., November 29-December 1, 1989). Network Planning Paper Number 20.
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New Consumer Online Services.
by: Collinge, Brian, et al.
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From Print to Nonprint Materials: Library Information Delivery Systems.
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Videotex: Chimera or Dream Machine.
by: Ball, A. J. S.
Published: (1981)

Telereference Services: The Potential for Libraries.
by: Rice, James
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Electronic Information Delivery Systems. Proceedings of the Library of Congress Network Advisory Committee Meeting (Washington, D.C., April 18-20, 1984). Network Planning Paper Number 9.
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Videotex and Libraries. Development of Resource Sharing Networks. Networks Study No. 19.
Published: (1981)

"SDI--Where are We? The Challenge of the Future." The Information Dissemination Center View.
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Vid/Tele-Reference: The New Frontier.
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Videotex: A New Tool for Libraries.
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Libraries and the Changing Scholarly Process. Occasional Paper 1.
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Videotex in Libraries: An Assessment of the British Experience and Directions for the Future.
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Electronic Information Delivery Systems: Reports on Five Projects Sponsored by the Fred Meyer Charitable Trust.
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The Delivery of Computer-Based Bibliographic Search Services by Academic and Research Libraries.
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Optimum Degree of User Participation in SDI Profile Generation.
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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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