Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

Η οπτική μεταγωγή καταιγισμών (Optical Burst Switching) είναι ένα ελπιδοφόρο παράδειγμα μεταγωγής για την επόμενη γενεά του Διαδικτύου. Ένα βασικό πρόβλημα στα δίκτυα OBS είναι η δρομολόγηση και ο χρονοπρογραμματισμός των καταιγισμών στους συνδέσμους του δικτύου, ώστε να μειωθεί η απώλεια και η καθυστέρηση τους. Εδώ παρουσιάζουμε έναν βασισμένο στην πηγή αλγόριθμο δρομολόγησης και χρονοπρογραμματισμού πολλαπλών κριτηρίων για την επιλογή μονοπατιών (διαδρομών) που ακολουθούνται από τους καταιγισμούς. Ο αλγόριθμος επιπλέον υπολογίζει και το χρόνο στον οποίο πρέπει να αρχίσει η μετάδοση των καταιγισμών ώστε να φθάσουν στον προορισμό με την ελάχιστη καθυστέρηση. Τα διαγράμματα χρησιμοποίησης (utilization profiles) των συνδέσμων του δικτύου, η καθυστέρηση διάδοσης των συνδέσμων και οι παράμετροι των καταιγισμών (μέγεθος, offset time κ.α.) διαμορφώνουν τα δεδομένα εισόδου του αλγορίθμου. Το προτεινόμενο σχήμα εκμεταλλεύεται τα κενά (void filling) που προκύπτουν από τη χρήση του bandwidth σε κάθε σύνδεσμο ώστε να βρεθεί η καλύτερη διαθέσιμη διαδρομή. Όταν δεν υπάρχει καμία κατάλληλη διαδρομή τη χρονική στιγμή που ζητείται από τον καταιγισμό, ο αλγόριθμος καθορίζει επίσης το χρονικό διάστημα (Time Offset) που πρέπει να καθυστερήσουμε τον καταιγισμό στην πηγή έως ότου γίνει διαθέσιμη η καλύτερη δυνατή διαδρομή. / Optical burst switching (OBS) is considered a promising switching paradigm for the next generation Internet. A key problem in OBS networks is the routing and scheduling of the bursts on the network links, so as to reduce burst loss and delay. In this paper we present a source-based multicost routing and scheduling algorithm to select the paths to be followed by the bursts and the times when the bursts should start transmission from their source so as to arrive at their destination with minimum delay. The utilization profiles of the network links, the link propagation delays, and the parameters of the bursts that have to be scheduled form the inputs to the algorithm. The proposed scheme exploits gaps in capacity utilization so as to find the best available path. When there is no suitable path at the time it is requested, the algorithm also determines the amount of time the burst must be delayed at the source for the best path to become available.

Final Report, Efficient and Equitable Solution of Indian Reserved Rights, USGS Grant #14-08-0001-G1320, June 21, 1989. / The water rights claims of many Indian reservations in the West are now under adjudication. Frequently, the parties to these adjudications acknowledge that their interests may be better served through negotiated settlements, but they lack comprehensive means for determining mutually acceptable solutions to the conflicts. The research conducted under the title of "Efficient and Equitable Solution of Indian Reserved Rights" (Project #14-08-0001-G1320) sought to 1) develop a conceptual basis for determining Indian water rights; 2) develop an analytical procedure to provide the information needed to resolve water rights conflicts; and 3) apply this analytical procedure to a test case involving the Gila River Basin in Arizona. The methodological core of the research is a set of linked models, encompassing historical, hydrologic, economic, psychological, and institutional elements of the conflict. Hydrologic, institutional, and economic analyses of conjunctive management of surface and groundwater supplies were facilitated by the use of MODSIM, a network optimization model. Data from the model enabled the investigators to construct an impact matrix, defining the effect of each possible settlement option on the goals of the parties. The preferences of the parties were elicited through social judgement analysis. Twelve settlement options were defined on the basis of knowledge of other negotiated settlements, and a final option, representing possible outcomes should the negotiation process fail, was included in the analysis. The next step was to model the possible choices available the contending parties, utilizing an n-person cooperative game framework. This analysis indicated that a set of three settlement options dominated the adjudication option for all players. Each of these included the provision of imported water in lieu of water currently being used in the basin. It is anticipated that the results of this research will be developed as a book-length manuscript by the principal investigators and the research team.

No description available.

Software Transactional Memory (STM) helps programmers write correct concurrent code by allowing them to identify atomic sections rather than focusing on the mechanics of concurrency control. Given code with atomic sections, the compiler and STM runtime can work together to ensure proper controlled access to shared memory. STM runtimes use either lazy or eager version management. Lazy versioning buffers transaction updates, whereas eager versioning applies updates in-place. The current set of primitives suit lazy versioning since memory needs to be accessed through the runtime. We present a new set of runtime primitives that better suit eager versioned STM. We propose a novel extension to the compiler/runtime interface, consisting of memory reservations and memory releases. These extensions enable optimizations specific to eager versioned runtimes. A memory reservation allows a transaction to perform instrumentation-free access on a memory address. A release allows a read-only address to be modified by another transaction. Together, these reduce the instrumentation overhead required to support STM and improve concurrency between readers and writers. We have implemented these primitives and evaluated its performance on the STAMP benchmarks. Our results show strong performance and scalability improvements to eager versioned algorithms.

Thesis (M.S.) -- University of Montana, 2008. / Title from title screen. Description based on contents viewed May 5, 2009. Includes bibliographical references (p. 113-119).

Thesis (M.A.)--Clemson University, 2007. / Includes bibliographical references (p. [105-111]).

Thesis (MS )--Montana State University--Bozeman, 2008. / Typescript. Chairperson, Graduate Committee: William Wyckoff. Includes bibliographical references (leaves 186-200).

Thesis (M.S.)--University of Massachusetts Amherst, 2008. / Includes bibliographical references (p. 78-80).

Wildlife conservation in England is in transition because nature reserve based conservation has three weaknesses. They have not reversed biodiversity decline, nor do they provide the means for species to move across the landscape in response to climate change, and most reserves are too small to be part of an ecosystem approach to conservation. Landscape scale conservation (LSC) addresses these deficiencies. Therefore, the purpose of my thesis was to understand the meaning of LSC as implemented in the Living Landscapes schemes of The Wildlife Trusts (TWT) movement in England. My research also examined the governance and management of these schemes. I used a constructivist approach to investigate the institutions and discourses of Living Landscapes. To do this, I conducted an email survey of the 36 Trusts in England and then studied the available documentation that describes Living Landscapes. Then I carried out a series of in-depth interviews with stakeholders associated with five Wildlife Trusts. The purpose of these interviews was to understand what their Living Landscape schemes meant to these stakeholders. The email survey and subsequent document study revealed the range and type of Living Landscapes across England. LSC is complex, suggesting that ecosystem services are too intricate a typography to assign to these schemes. I developed an understanding of what is meant by LSC through the lens of stakeholders in Living Landscapes. I examined TWT’s LSC vision which revealed the discourses and formal and informal institutions of Living Landscapes. I also examined Lockwood’s framework for LSC governance, one of LSC’s institutions. My research examined the Wildlife Trust movement’s approach to delivering LSC. Two types of institutions are evident, informal institutions define the physical attributes of Living Landscapes, whilst formal institutions are characteristic of their governance and management. Its key discourses of conservation, education and community engagement define Living Landscapes, whilst ecosystem services emerged as a new discourse to reflect the multifaceted cultural and historical elements in the landscape. TWT’s once insular approach to governance is in transition to a pluralistic model that encourages greater community involvement. Therefore, if LSC is to be a template for successful conservation it must embrace a wider definition of both conservation and governance.