This thesis deals with the nature and definition of phonological similarity and shows that, when similarity plays a role in the motivation of phonological processes, it is evaluated over abstract, phonological features and not purely phonetic properties. Empirical evidence for this position is drawn from the domain of consonant harmony. Typological studies of consonant harmony (Hansson 2001, Rose and Walker 2004) have argued that segments which interact in consonant harmony processes must be highly similar to one another. This thesis provides analyses of a range of consonant harmony processes and demonstrates that, in each case, the notion of similarity needed in order to determine participating segments is evaluated over contrastive feature specifications. Contrastive specifications are established according to language-specific feature hierarchies (Jackobson and Halle 1956, Dresher 2003, forthcoming) with some features taking scope over others. Languages analyzed in some detail include Bumo Izon, Kalabari Ijo, Hausa, Dholuo, Anywa, Tzutujil and Aymara. Two definitions of similarity are proposed in order to account for two sets of cases. In one set of consonant harmony processes, interacting segments are similar in the sense that they constitute the natural class of segments contrastively specified in the harmonic feature. In another set of cases, participating segments must be similar according to the following definition; they must differ in only a single marked and contrastive feature specification.

国立情報学研究所で電子化したコンテンツを使用している。

Distributed denial of service attacks (or DDoS) are a common occurrence on the internet and are becoming more intense as the bot-nets, used to launch them, grow bigger. Preventing or stopping DDoS is not possible without radically changing the internet infrastructure; various DDoS mitigation techniques have been devised with different degrees of success. All mitigation techniques share the need for a DDoS detection mechanism. DDoS detection based on traffic self-similarity estimation is a relatively new approach which is built on the notion that undis- turbed network traffic displays fractal like properties. These fractal like properties are known to degrade in presence of abnormal traffic conditions like DDoS. Detection is possible by observing the changes in the level of self-similarity in the traffic flow at the target of the attack. Existing literature assumes that DDoS traffic lacks the self-similar properties of undisturbed traffic. We show how existing bot- nets could be used to generate a self-similar traffic flow and thus break such assumptions. We then study the implications of self-similar attack traffic on DDoS detection. We find that, even when DDoS traffic is self-similar, detection is still possible. We also find that the traffic flow resulting from the superimposition of DDoS flow and legitimate traffic flow possesses a level of self-similarity that depends non-linearly on both relative traffic intensity and on the difference in self-similarity between the two incoming flows.

Thesis (Ph. D.)--University of Texas at El Paso, 2008. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.

Thesis (M.S.)--Western Washington University, 2009. / Includes bibliographical references (leaves 33-35). Also issued online.

Thesis (Ph. D.)--University of Texas at El Paso, 2008. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.

Thesis (Ph. D.)--University of Texas at El Paso, 2008. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.

Thesis (Ph. D. )--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 73-75).

Thesis (M. A.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (leaves 42-48). Also available via the World Wide Web.

Ο νεοπλατωνικός φιλόσοφος Πρόκλος, στο α΄ μέρος της πραγματείας του Εις τον Παρμενίδη του Πλάτωνος Β΄, διατυπώνει μία εισαγωγική σκέψη για την πλατωνική θεωρία των Ιδεών, την οποία παρουσιάζει αναλυτικά στην συνέχεια του έργου του, δηλώνοντας ρητά την αδιαμφισβήτητη αντικειμενική ύπαρξη των Ιδεών, ως αρχετύπων των όσων λαμβάνουν χώρα στον κόσμο της αισθητής εμπειρίας. Τονίζει , ότι τόσο οι Ιδέες, όσο και τα αισθητά οφείλουν την ύπαρξή τους στο Έν, την ανώτατη υπερβατική Αρχή, η οποία αποτελεί την απόλυτη ενότητα και από την οποία απορρέει το πλήθος. Επομένως, η ενότητα προηγείται του πλήθους και η εν λόγω προτεραιότητα παρουσιάζεται με μία σειρά από επιχειρήματα. Έπειτα αναζητείται η καταστατική τάξη των Ιδεών, οι οποίες βρίσκονται τοποθετημένες στον δικό τους «τόπο», συμπλέκονται χωρίς να υφίστανται αλλοιώσεις, διατηρώντας την μοναδικότητα, την ταυτότητα καθώς και την ενότητά τους. Συγκεκριμένα, παρακολουθούμε ποια είναι η ουσία και οι δυνάμεις της Ομοιότητας και της Ανομοιότητας αντιστοίχως, ποια είναι η διάταξή τους ανάμεσα στις Ιδέες ποια είναι η λειτουργική παρουσία τους και εν τέλει ποια είναι η μεταξύ τους σχέση. Πρόκειται για ένα ζήτημα που ανήκει στον συστηματικό κλάδο της μεταφυσικής οντολογίας αλλά και συγχρόνως εντάσσεται και στην ιστορία της φιλοσοφίας, καθότι παρουσιάζει ένα στάδιο της εξέλιξης μιας θεωρίας που αναπτύχθηκε τον 4ο αιώνα π. Χ. / --