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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.
511

A Relational Localisation Theory for Topological Algebras

Schneider, Friedrich Martin 07 August 2012 (has links) (PDF)
In this thesis, we develop a relational localisation theory for topological algebras, i.e., a theory that studies local approximations of a topological algebra’s relational counterpart. In order to provide an appropriate framework for our considerations, we first introduce a general Galois theory between continuous functions and closed relations on an arbitrary topological space. Subsequently to this rather foundational discussion, we establish the desired localisation theory comprising the identification of suitable subsets, the description of local structures, and the retrieval of global information from local data. Among other results, we show that the restriction process with respect to a sufficiently large collection of local approximations of a Hausdorff topological algebra extends to a categorical equivalence between the topological quasivariety generated by the examined structure and the one generated by its localisation. Furthermore, we present methods for exploring topological algebras possessing certain operational compactness properties. Finally, we explain the developed concepts and obtained results in the particular context of three important classes of topological algebras by analysing the local structure of essentially unary topological algebras, topological lattices, and topological modules of compact Hausdorff topological rings.
512

Advanced Routing Protocols for Satellite and Space Networks

Chen, Chao 12 May 2005 (has links)
Satellite systems have the advantage of global coverage and offer a solution for providing broadband access to end users. Local terrestrial networks and terminals can be connected to the rest of the world over Low Earth Orbit (LEO) satellite networks simply by installing small satellite interfaces. With these properties, satellite systems play a crucial role in the global Internet to support real-time and non-real-time applications. Routing in satellite networks, and the integration of satellite networks and the terrestrial Internet are the key issues to support these services. Furthermore, the developments in space technologies enable the realization of deep-space missions such as Mars exploration. The Interplanetary Internet is envisioned to provide communication services for scientific data delivery and navigation services for the explorer spacecrafts and orbiters of future deep-space missions. The unique characteristics posed by deep-space communications call for different research approaches from those in terrestrial networks. The objective of this research is to develop advanced architectures and efficient routing protocols for satellite and space networks to support applications with different traffic types and heterogeneous quality-of-service (QoS) requirements. Specifically, a new QoS-based routing algorithm (QRA) is proposed as a connection-oriented routing scheme to support real-time multimedia applications in satellite networks. Next, the satellite grouping and routing protocol (SGRP) is presented as a unicast routing protocol in a two-layer satellite IP network architecture. The border gateway protocol - satellite version (BGP-S) is then proposed as a unified routing protocol to accomplish the integration of the terrestrial and satellite IP networks at the network layer. Finally, a new routing framework, called the space backbone routing (SBR), is introduced for routing through different autonomous regions in the Interplanetary Internet. SBR provides a self-contained and scalable solution to support different traffic types through the Interplanetary Internet.
513

Optimization and Analysis of The Total Cavo-Pulmonary Connection

Soerensen, Dennis Dam 13 January 2006 (has links)
Single Ventricle congenital heart defects with cyanotic mixing between systemic and pulmonary circulations afflict 2 per 1000 live births. The total cavo-pulmonary connection (TCPC), where the superior and inferior vena cavae are sutured to the left and right pulmonary arteries, is the current procedure of choice. It is believed that reducing the fluid mechanical power losses in the TCPC will relieve strain on the single functional ventricle. It is hypothesized that a proposed idealized TCPC design, decreases power losses to a level below that of any other TCPC designs, while providing other advantages and increased flexibility. Physical models with slightly different geometries of the proposed design were created, and in vitro experiments carried out with particle image velocimetry (PIV), phase contrast magnetic resonance imaging (PC-MRI), and control volume flow analysis at physiological flow rates. Computational fluid dynamics (CFD) was used for numerical studies of the same geometries as in the physical models. Power losses were calculated using the control volume method and the viscous power dissipation function. The latter method incorporated registration of high-resolution PC-MRI velocity vectors to tetrahedral meshes followed by inverse interpolation of the vectors onto the meshes. Detailed flow structures were analyzed. Results show that the new design is more energy efficient than any other idealized models. Furthermore, a tool was developed to extract flow and vessel information from PC-MRI datasets obtained from patients with Fontan connections. The tool utilized a display algorithm, which was developed for optimal noise detection in PC-MRI images. This enabled accurate segmentation. Comparing PC-MRI images before and after this accurate segmentation showed that the standard deviations of the pixels at the perimeter of the segmented vessel were statistically significantly smaller after the segmentation in 94.1% of the datasets investigated. The developed tool was able to extract flow, flow in the quadrants of vessels, area of the segmented vessel, velocities and pulsatility indices. The velocity vectors were exported for use as CFD boundary conditions in models reconstructed from patient anatomies. A database was created with patient PC-MRI data from approximately 140 patients, which is probably the largest database in the world.
514

A Study on the Opinions of Kaohsiung Private Senior High Educators Toward the Policy of Localization of Senior High Schools

Chen, Mow-ling 19 June 2006 (has links)
The study is to explore the opinion of Kaohsiung private senior high educators toward the policy of localization of senior high schools, the four main purposes are: 1. To probe into the coordination condition. 2. To probe into the carrying out of the policy. 3. To probe into the educator¡¦s evaluation and prospect for the policy of localization. 4. To provide the high positions with the necessary practical information in assistance to the carrying out of the policy of localization. The study is based on individual Kaohsiung private high school, from ten schools and 996 educators (include principal, administrators and teachers), then select around 30% of the subjects from each school, which total up to 337 research subjects. The study used questionnaire to collect data, and the main results and conclusions as shown in below: 1¡BMain results: (1) The lack of confidence the educators have towards the statistics of suspended students, transferred students and the drop offs. (2) Compare to the pressure of recruiting, the principal has less pressure than the most educators, such as superintendent, the head of the department, student recruiters and the teachers. (3) The educator¡¦s dissatisfaction towards the carrying out of the policy of the connection with their communities. (4) The educator¡¦s adaptation as for the knowledge of ¡§Fit for learning and the recognition of communities¡¨ varies; all depend on the seniority of individual personnel, and obviously subject teachers who have entered the force less than five years has lower adaptability. (5) The adaptation of ¡§Fit for learning and the recognition of communities¡¨ study is divided into north, center and south sectors; center sector scores the lowest for it. 2¡BConclusion: (1) A good relationship establishment between the private high school sector and the junior high school sector has shown positive effects in regard of the students recruiting. (2) To recruit quality junior high school students, the use of attractive scholarship is imperative. If the tuition system follows the one of public high schools, teachers¡¦ incentive for students recruiting will be reduced. (3) The attentiveness of the private high school teachers has definitely made some great improvements on teaching programs, such as the use of internet, has given the students a great opportunity in explore the benefit of multimedia study. (4) Amongst the private high sector, all seniority level show similar opinion towards the policy of communities¡¦ connection, all personnel must work together in carrying out policy. (5) The result of the opinion on the policy of localization questionnaire show, the average statistic against the adaptation of the policy of localization is the highest, almost in favor of approval.
515

Facilitating school connection : the roles of relationship development and extracurricular activity participation

Roberts, Lisa Garety 03 December 2010 (has links)
Numerous researchers have examined school and student variables that can prevent school failure, dropping out, and the development of delinquent behaviors. Such research suggests that students who establish a strong connection to school early in their academic career have higher academic achievement, better attendance, and more school participation (J. D. Finn, 1989, 1993; Finn & Rock, 1997; Sirin & Rogers-Sirin, 2005). However, there is little research that evaluates mechanisms that could be used to intervene when older students are on course for failure or delinquency. The current study, therefore, attempts to expand on the understanding of precipitating factors for school connection by investigating a possible link between school connection, extracurricular activity participation (EAP), and the relationships with teachers, parents, and peers promoted through activity participation. Latent variable structural equation modeling was used to investigate whether relationships with teachers, parents, and peers mediate the effects of EAP on school connection across time. Data from the base year (8th grade), first follow-up (10th grade), and second follow-up (12th grade) waves of the National Educational Longitudinal Study: 1988-2000 (NELS:88) were used. Three latent variable panel models were created and analyzed; one each for Relationships with Teachers, Relationships with Parents, and Relationships with Peers as the mediating variables. Results supported previous literature in that models reflecting a reciprocal relationship between EAP and school connection were found to have the best fit. Additionally, latent variable structural equation models were constructed to simultaneously compare the influence of EAP on the three types of relationships (i.e., with teachers, parents, and peers) and their subsequent influence on school connection. Finally, a latent variable structural equation model was constructed to explore possible differences in the type of activity in which a student participates on their relationships with others and school connection. / text
516

Circles of learning : creating opportunity to give voice and bear witness to self, others, and nature in environmental education

Cameron, Laura C. 21 March 2013 (has links)
By asking, “Is Circle (also known as “council”) an effective methodology for environmental education?”, this thesis explores the significance of creating Circles of learning as a communication process with implications for environmental education and personal transformation. From a phenomenological perspective, I have positioned my research as an autobiographical narrative of what it is to be both researcher (observer) and research instrument (facilitator & participant) as well as creating the conditions for a case study of Circle participants. Further, I held interviews with Circle practitioners and instructors. The premise of Circle is to create an intentional listening space for each person to have a voice and be witnessed as they tell their stories. This paper provides some insight here, and explores how Circle can become an effective means of exploring ecological identity, self-awareness, relationship-building, a sense of community, emotional connections to nature and a sense of wonder within the process.
517

Studies in failure independent path-protecting p-cycle network design

Baloukov, Dimitri Unknown Date
No description available.
518

Judesiai n-matėje hiperplokštuminių elementų erdvėje / Movements in n - dimensional space of hyperplane elements

Kochanskaitė, Diana 27 June 2011 (has links)
Darbe nagrinėjami judesiai n-matėje hiperplokštuminių elementų erdvėje . Gauti rezultatai: 1. Įrodyta, kad n-matėje hiperplokštuminių elementų erdvėje maksimalus judesių grupių parametrų skaičius yra parametrai. 2. Įrodyta, kad n-matėje hiperplokštuminių elementų erdvėje su nesimetrine tiesine sietimi maksimalus judesių grupių parametrų skaičius yra parametrai. / The present work analyses movements in n-dimensional space of hyperplaine elements . The received results: 1. It was proved that in the n-dimensional space the maximum number of movement groups parameters, number is parameters 2. It was proved that in the n-dimensional space the maximum number of movement groups parameters with asymmetric linear connection is parameters.
519

Electrifying Development: Identifying Key Policy Tools For Facilitating Rural Electrification in Sub-Saharan Africa

Shimkus, Jacob 01 January 2015 (has links)
Rural electrification is a critical tool for accelerating and enhancing development throughout Sub-Saharan Africa. The challenge for modern policymakers is to identify and implement programs that will effectively facilitate rural electrification. This analysis develops a model for comparing the performance of nations' electrification policies using a fixed effects regression model based on World Bank data from 1990, 2000 and 2010. To identify the key policies for driving rural electrification, this analysis then compares the programs and reforms employed in six nations from Sub-Saharan Africa. As a result, three reform measures are identified that are conditional on outside factors for their contribution to success, and three universal policies are identified that may be broadly applied to improve rural electrification throughout the region.
520

Välj rätt känd profil : En studie inriktad på kapitalvarubranschen. Företagens användning av marknadsföringsmetoden Celebrity endorsement, tillsammans med kundernas uppfattning. / Choose the right celebrity : A study focused on the capital goods industry. Companies’ use of marketing method Celebrity endorsement, along with customer perception.

Wikström, Niclas, Sjöholm, Daniel January 2014 (has links)
No description available.

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