Media Service as a Disciplinary Application of General Systems Science.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Author:	DeHart, Florence E.
Format:	Recurso educativo Open Access
Language:	en
Published:	1974
Subjects:	Communication (Thought Transfer) Communications Information Science Information Services Information Systems Information Utilization Library Education Media Specialists Operations Research Program Design Researchers Systems Approach
Online Access:	Acceder al recurso
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Information Literacy Meets Media Literacy and Visual Literacy.
by: Sutton, Ronald E.
Published: (1993)

A Personal Viewpoint
by: Brown, James
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Internationality of the Social Sciences: Implications for Information Transfer.
by: Brittain, J. Michael
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Technology Transfer: A Selected Bibliography.
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The Reactive Library.
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The Dilemma of the Subjective in Information Organisation and Retrieval.
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Information Management in Agricultural Research.
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Scientists, Information Seeking, and Reference Services.
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Communication Theory.
by: Penland, Patrick R.
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PEACESAT [Pan Pacific Education and Communication Experiments by Satellite] Project Networks: Using Satellite Communication Networks to Improve Social Conditions. Report 3.
Published: (1975)

Communication Research for Librarians.
by: Penland, Patrick R.
Published: (1972)

Attitudes and Values Associated With Information
by: Felten, Suzanne Y.
Published: (1971)

Faculty Awareness and Attitudes Toward Academic Library Reference Services: A Measure of Communication
by: Nelson, Jerold
Published: (1973)

Science, Scholarship and the Communication of Knowledge.
by: Lancaster, F. W., et al.
Published: (1979)

Neighborhood Communications Centers: Planning Information and Referral Services in The Urban Library.
by: Yin, Robert K., et al.
Published: (1974)

Publishing of Research in Librarianship.
by: Magrill, Rose Mary
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Information Utilities. Proceedings of the 37th ASIS Annual Meeting. Vol. 11.
by: Zunde, Pranas, Ed.
Published: (1974)

Libraries' Central Role in Informing the Community
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Communication Media in Ancient Cultures.
by: Jabusch, David M.
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An Optimal Foraging Approach to Information Seeking and Use.
by: Sandstrom, Pamela Effrein
Published: (1994)

Factors Affecting the Use of Information for Academic Library Decision Making.
by: McClure, Charles R., et al.
Published: (1985)

Defining Information Needs of Computer Users: A Human Communication Problem.
by: Kimbrough, Kenneth L.
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Unmediated and Mediated Information Searching in the Public Library.
by: Nordlie, Ragnar
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The Communication-Information Relationship in System-Theoretic Perspective.
by: Ruben, Brent D.
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Toward Information Centers
by: Jackson, Eugene
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Communication for Librarians.
by: Penland, Patrick R.
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Information-Seeking Behavior: Patterns and Concepts.
by: Krikelas, James
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Writing and Reading Aids for the Physically Disabled
by: Shaw, Alison
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Communication Research in Library and Information Science: A Bibliography on Communication in the Sciences, Social Sciences, and Technology.
by: Waldhart, Thomas J., et al.
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The Myth of Scientific Sufficiency in Librarianship.
by: Wright, H. Curtis
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Dial Access: A Way to Spread Your Message.
by: Baird, Marcia, Comp., et al.
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Evaluation of a Current Awareness Service in an Academic Library.
by: McKimmie, T.
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Communication Patterns in Library Reference and Information Service
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Progress in Urban Librarianship. A Seminar on Community Information Needs and the Designing of Library Education Programs to Meet These Needs. Library Science Studies, No. 4.
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The Communications Behavior of Academic Economists in Research Phases
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Defining the Divide: Causes of Friction between Librarians and Computer Support Staff.
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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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