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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
121

Μοντελοποίηση γραφημάτων σε μπλοκ

Μπέκας, Σταύρος 25 May 2009 (has links)
Στόχος της παρούσας διπλωματικής εργασίας είναι να παρουσιάσει τις τεχνικές και τις μεθόδους που πρέπει να ακολουθηθούν για να διαμεριστούν οι κορυφές ενός απλού γραφήματος σε ομάδες κορυφών, οι οποίες κατέχουν όμοιες ή παρόμοιες δομές σύνδεσης με άλλες ομάδες. Η διπλωματική εργασία αποτελείται από τέσσερα μέρη. Στο πρώτο μέρος της εργασίας δίνεται ο ορισμός του απλού γραφήματος, της ομαδοποίησης, του μπλοκ και του μοντέλου των μπλοκ, έννοιες οι οποίες είναι απαραίτητες για την συνέχεια. Στο δεύτερο μέρος περιγράφονται δύο τύποι ισοδυναμίας, που χρησιμοποιούνται για την ομαδοποίηση των κορυφών ενός γραφήματος, καθώς επίσης και δύο μέθοδοι για την επίτευξη της ομαδοποίησης των κορυφών. Στο τρίτο μέρος δίνεται μια πιο γενική ιδέα για την ομαδοποίηση των κορυφών ενός γραφήματος, η οποία βασίζεται σε μια από τις δυο προηγούμενες μεθόδους προσέγγισης της ομαδοποίησης. Στο τέταρτο και τελευταίο μέρος δίδεται μια επέκταση της ομαδοποίησης πάνω σε διμερή δεδομένα και παρουσιάζονται ατα αποτελέσματα, από την εφαρμογή αυτής της επέκτασης σε ένα εμπειρικό παράδειγμα. / -
122

Improving disk read performance through block-level replication into free space

Lifchits, Andrei 05 1900 (has links)
Disk performance for random access fares significantly worse compared to sequential access. Time required to transfer random blocks to or from disk is dominated by seeking and rotational delay. To improve the throughput and reduce the latency, one can apply techniques to increase the sequentiality of disk accesses, such as block rearrangement and replication. We introduce an approach to improve read performance by replicating blocks into file system free space at the block level. This makes the replication module independent of the file system and therefore easier to implement and verify. A solution that requires no changes to the file system is also easier to adopt. Supporting a new file system is a matter of writing a user-space component that understands its free block data structures. We implemented a prototype as a stacked device driver for Linux and evaluated its performance on a number of workloads.
123

Asymptotic Distributions for Block Statistics on Non-crossing Partitions

Li, Boyu January 2014 (has links)
The set of non-crossing partitions was first studied by Kreweras in 1972 and was known to play an important role in combinatorics, geometric group theory, and free probability. In particular, it has a natural embedding into the symmetric group, and there is an extensive literature on the asymptotic cycle structures of random permutations. This motivates our study on analogous results regarding the asymptotic block structure of random non-crossing partitions. We first investigate an analogous result of the asymptotic distribution for the total number of cycles of random permutations due to Goncharov in 1940's: Goncharov showed that the total number of cycles in a random permutation is asymptotically normally distributed with mean log(n) and variance log(n). As a analog of this result, we show that the total number of blocks in a random non-crossing partition is asymptotically normally distributed with mean n/2 and variance n/8. We also investigate the outer blocks, which arise naturally from non-crossing partitions and has many connections in combinatorics and free probability. It is a surprising result that among many blocks of non-crossing partitions, the expected number of outer blocks is asymptotically 3. We further computed the asymptotic distribution for the total number of blocks, which is a shifted negative binomial distribution.
124

Improving disk read performance through block-level replication into free space

Lifchits, Andrei 05 1900 (has links)
Disk performance for random access fares significantly worse compared to sequential access. Time required to transfer random blocks to or from disk is dominated by seeking and rotational delay. To improve the throughput and reduce the latency, one can apply techniques to increase the sequentiality of disk accesses, such as block rearrangement and replication. We introduce an approach to improve read performance by replicating blocks into file system free space at the block level. This makes the replication module independent of the file system and therefore easier to implement and verify. A solution that requires no changes to the file system is also easier to adopt. Supporting a new file system is a matter of writing a user-space component that understands its free block data structures. We implemented a prototype as a stacked device driver for Linux and evaluated its performance on a number of workloads.
125

Synthesis and characterisation of organic-inorganic hybrid block copolymers of polydimethylsiloxane and polystyrene /

Bayley, Gareth Michael. January 2007 (has links)
Thesis (MSc)--University of Stellenbosch, 2007 / Bibliography. Also available via the Internet.
126

Evaluation of the 4x4 block schedule in Virginia's secondary schools the impact on students' academic performance /

Austin, Brian T. January 2008 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2008. / Title from title screen (site viewed Mar. 5, 2009). PDF text: vi, 126 p. ; 731 K. UMI publication number: AAT 3336690. Includes bibliographical references. Also available in microfilm and microfiche formats.
127

Application of High Frequency Electrical Block on the Efferent Nerves to the Lower Urinary Tract for Bladder Voiding

Boger, Adam Sprott January 2009 (has links)
Thesis (Ph.D.)--Case Western Reserve University, 2009 / Abstract Department of Biomedical Engineering Title from PDF (viewed on 20 April 2009) Available online via the OhioLINK ETD Center
128

Experimental studies of morphology and of its control in diblock copolymer ultrathin films /

Morkved, Terry L. January 1997 (has links)
Thesis (Ph. D.)--University of Chicago, Dept. of Physics, December 1997. / Includes bibliographical references. Also available on the Internet.
129

A study to determine the extent of use and impacts of block scheduling on technology education programs in middle size Wisconsin high schools

Davis, William R. January 1998 (has links) (PDF)
Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 1998. / Includes bibliographical references.
130

Impacts of block scheduling on technology education at Little Chute High School

Greuel, Jeff. January 1998 (has links) (PDF)
Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 1998. / Includes bibliographical references.

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