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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.
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Showing 61 to 70 of 70 (0.011 seconds)| 61 |
An agent framework to support sensor networks’ setup and adaptationde Freitas, Edison Pignaton, Heimfarth, Tales, Ferreira, Armando Morado, Wagner, Flávio Rech, Pereira, Carlos Eduardo, Larsson, Tony January 2009 (has links)
Sensor networks are being used in several emerging applications not even imagined some years ago due to advances in sensing, computing, and communication techniques. However, these advances also pose various challenges that must be faced. One important challenge is related to the autonomous capability needed to setup and adapt the networks, which decentralizes the control of the network, saving communication and energy resources. Middleware technology helps in addressing this kind of problem, but there is still a need for additional solutions, particularly considering dynamic changes in users' requirements and operation conditions. This paper presents an agent-based framework acting as an integral part of a middleware to support autonomous setup and adaptation of sensor networks. It adds interoperability among heterogeneous nodes in the network, by means of autonomous behavior and reasoning. These features also address the needs for system setup and adaptations in the network, reducing the communication overhead and decentralizing the decision making mechanism. Additionally, preliminary results are also presented.
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Trainer competency and psychological optimalityCilliers, Hendrik Johannes 06 1900 (has links)
A productive workforce is recognized as the primary resource for all organizations. Workforce training and constant retraining must be a priority. The trainers' role to add value in this process is recognised.
The general aim of this research was to ascertain the correlation and difference between trainer competency and psychological optimisation. The following measurement instruments were used in the study - TCQ, POI, SOCq
and SCS. This study was conducted among 57 trainers working for a large transport organisation.
Through a literature survey, training and psychological optimisation were defined and a personality profile of the competent trainer integrated with that of the psychological optimal functioning individual. Through an empirical study, the correlation and difference between trainer competency and psychological optimisation were determined. Supporting evidence, although not enough, indicates a correlation between trainer
competency and psychological optimisation, and a difference in psychological optimisation between the high and low trainer competency groups. / Industrial and Organisational Psychology / M. Admin. (Industrial Psychology)
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Statistiques spatiales des cavités chaotiques ouvertes : applications aux cavités électromagnétiques / Spatial statistics of open chaotic cavities : applications to electromagnetic cavitiesGros, Jean-Baptiste 19 December 2014 (has links)
Les chambres réverbérantes à brassage de modes (CRBM) utilisées dans l'industrie pour tester l'immunité ou la susceptibilité des systèmes électroniques embarqués (avion, automobile , smartphone,...) vis-à-vis des ondes électromagnétiques (EM) présentes dans leur environnement. Les CRBM doivent toutes répondre à un certain nombre de critères statistiques fixés par une norme internationale. Le critère principale étant l'obtention d'un champ statistiquement uniforme et isotrope autour de l'objet sous test. Afin améliorer et de mieux maîtriser les propriétés statistiques de ces systèmes pour des fréquences proches de leur fréquence minimale d'utilisation, nous proposons de les rendre chaotiques afin de profiter des propriétés statistiques universelles des résonances des cavités chaotiques. Nous commencerons par montrer comment rendre chaotique, par des modifications simples, des chambres réverbérantes conventionnelles, et comment étendre les prédictions de la théorie des matrices aléatoire appliquée (TMA) à l'hamiltonien effectif, permettant de décrire les systèmes chaotiques ouverts, au cas de systèmes décrits par des champs vectoriels. Ensuite, nous comparerons, au moyen de simulations et d’expériences, les distributions d'intensité et les fluctuations des maxima du champ EM dans une CRBM conventionnelle et dans une CR chaotique au voisinage de la fréquence minimale d’utilisation. Ce travail illustre que les propriétés statistiques spectrales et spatiales universelles des CR chaotiques permettent de mieux répondre aux critères exigés par la norme internationale pour réaliser des tests de compatibilité électromagnétiques. / Mode-stirred reverberation chambers (RC) are used in the industry to test the immunity or the susceptibility of on-board electronic systems (plane, automobile, smartphone) towards the electromagnetic waves present in their environment. Mode-stirred RCs have to comply with a number of statistical criteria fixed by international standards. The chief criterion relies on a statistically uniform and isotropic field around the object under test. In order to improve and master the statistical properties of these systems for frequencies close to their lowest useable frequency, we suggest making them chaotic to take advantage of universal statistical properties of the resonances of chaotic cavities. We first show how to make chaotic RCs by simple modifications of a conventional RC and how to extend the predictions of the random matrix theory applied to the effective hamiltonien describing the open chaotic systems, to the case of vectorial fields. Then, we compare, by means of simulations and experiments, the distributions of intensity and the fluctuations of the maxima of the field in a conventional RC and in a chaotic RC close to the lowest useable frequency. This work illustrates that the universal spectral and spatial statistical properties of chaotic RCs allow to better comply with the criteria required by the international standards.
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An investigation of parity and time-reversal symmetry breaking in tight-binding latticesScott, Derek Douglas January 2014 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / More than a decade ago, it was shown that non-Hermitian Hamiltonians with combined parity (P) and time-reversal (T ) symmetry exhibit real eigenvalues over a range of parameters. Since then, the field of PT symmetry has seen rapid progress on both the theoretical and experimental fronts. These effective Hamiltonians are excellent candidates for describing open quantum systems with balanced gain and loss. Nature seems to be replete with examples of PT -symmetric systems; in fact, recent experimental investigations have observed the effects of PT symmetry breaking in systems as diverse as coupled mechanical pendula, coupled optical waveguides, and coupled electrical circuits.
Recently, PT -symmetric Hamiltonians for tight-binding lattice models have been extensively investigated. Lattice models, in general, have been widely used in physics due to their analytical and numerical tractability. Perhaps one of the best systems for experimentally observing the effects of PT symmetry breaking in a one-dimensional lattice with tunable hopping is an array of evanescently-coupled optical waveguides. The tunneling between adjacent waveguides is tuned by adjusting the width of the barrier between them, and the imaginary part of the local refractive index provides the loss or gain in the respective waveguide. Calculating the time evolution of a wave packet on a lattice is relatively straightforward in the tight-binding model, allowing us to make predictions about the behavior of light propagating down an array of PT -symmetric waveguides.
In this thesis, I investigate the the strength of the PT -symmetric phase (the region over which the eigenvalues are purely real) in lattices with a variety of PT - symmetric potentials. In Chapter 1, I begin with a brief review of the postulates of quantum mechanics, followed by an outline of the fundamental principles of PT - symmetric systems. Chapter 2 focuses on one-dimensional uniform lattices with a pair of PT -symmetric impurities in the case of open boundary conditions. I find that the PT phase is algebraically fragile except in the case of closest impurities, where the PT phase remains nonzero. In Chapter 3, I examine the case of periodic boundary conditions in uniform lattices, finding that the PT phase is not only nonzero, but also independent of the impurity spacing on the lattice. In addition, I explore the time evolution of a single-particle wave packet initially localized at a site. I find that in the case of periodic boundary conditions, the wave packet undergoes a preferential clockwise or counterclockwise motion around the ring. This behavior is quantified by a discrete momentum operator which assumes a maximum value at the PT -symmetry- breaking threshold.
In Chapter 4, I investigate nonuniform lattices where the parity-symmetric hop- ping between neighboring sites can be tuned. I find that the PT phase remains strong in the case of closest impurities and fragile elsewhere. Chapter 5 explores the effects of the competition between localized and extended PT potentials on a lattice. I show that when the short-range impurities are maximally separated on the lattice, the PT phase is strengthened by adding short-range loss in the broad-loss region. Consequently, I predict that a broken PT symmetry can be restored by increasing the strength of the short-range impurities. Lastly, Chapter 6 summarizes my salient results and discusses areas which can be further developed in future research.
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Exploring Sleep and the Hispanic Paradox in Mexico-born U.S. Adult ImmigrantsSeicean, Sinziana January 2010 (has links)
No description available.
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Un cadre d'application pour interfaces de gestion OSITessier, Jean 11 1900 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal. / OSI définit une suite de protocoles pour les réseaux ouverts hétérogènes. De tels
réseaux peuvent être très difficile à gérer à cause de la diversité des manufacturiers de
composantes, chacun définissant sa propre méthode de gestion. C'est pourquoi OSI
définit également CMIS, un service générique de gestion de réseaux qui permet de
normaliser les interfaces de gestion, c'est-à-dire de les rendre indépendantes de leur
manufacturier. Afin d'etre générique, CMTS est très complexe. Il utilise plusieurs autres
services d'OSI et peut tenir compte de plusieurs détails des activités de gestion. Une
application de gestion utilisant CMIS est donc passablement difficile à réaliser. On trouve
sur le marche des plate-forme de développement qui libèrent le programmeur d'une
application de gestion des détails de bas niveau, comme le transfert de données entre
applications et l'utilisation d'un format de transfert commun. Mais ces interfaces
programmatiques sont également très complexes et difficiles à utiliser.
C'est pourquoi, dans le cadre de sa maîtrise, l'auteur a développé un cadre
d'application qui, se servant d'une interface programmatique de bas niveau, offre au
programmeur une interface orientée objet de haut niveau plus facile à utiliser. De plus, le
cadre d'application effectue plusieurs tâches génériques de CMIS qui ne sont pas
couvertes par l'interface programmatique commerciales. Layla, le cadre d'application, est
présenté sous la forme d'un ensemble de patrons de conceptions, de "recettes" à suivre
pour réaliser une application. Certains de ces patrons ont déjà été publiés dans la
littérature, d'autres sont des adaptations des concepts de CMIS. Enfin, deux de ces
patrons sont originaux et ont été formalisés lors de la conception de Layla. Les patrons
sont suivis d'une description plus détaillée du cadre d'application et de trois exemples
d'applications réalisées avec Layla.
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Quality assurance challenges for private providers in post-school education and training in South AfricaBaumgardt, Jacqueline 09 1900 (has links)
Quality assurance has been a vexed and troubled journey for private providers in South
Africa in a complex and burdensome educational environment. It is well recognised that
private providers are significant role-players in the provision of education and training in
South Africa and the stated intention is to create a more enabling regulatory framework
The focus of this thesis is on the private providers at the post-school level. The quality
assurance regime was examined and contextualised to analyse what is required, and to
determine how the private provider is impacted by the regulatory requirements for the
establishment and operation of a private tuition provider in South Africa. The experience of
private providers, CEOs of professional bodies, ETQA managers and ETD practitioners was
investigated using a mixed methods research approach.
The conclusion is a call for a far more streamlined system with a centralised oversight body,
greater stakeholder consultation, less political interference and a deeper appreciation for the
contribution that private providers make to the education of learners in South Africa. / Educational Leadership and Management / D. Ed. (Education Management)
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親師生信任連結的家校生活：一所台灣另類國民小學教育實踐之個案研究 / The Home-school Life of Trustful Coupling Relationship among Parents, Teachers, and Students: a Case Study on an Alternative Elementary School in Taiwan詹家惠, Jan, Chia Hui Unknown Date (has links)
本研究採用質性研究方法，以開放系統理論為架構，從組織運作的角度來探究個案學校─種籽親子實驗國民小學之日常生活和教育實踐，從而描繪出這所另類學校的學校圖像，並分析該校穩健存續的因素。本研究之研究結果如下：
一、本研究分別以「學生學習的制度」和「學校運作的制度」來描繪種籽親子實驗國民小學之學校圖像。前者包含課程學習及生活學習的各項制度，開展出師生自由自主、和諧共融的家校生活；後者敘述親師合作辦學治校，以及攸關教師成長的各項制度，開展出親師互信互賴、共同成長的家校生活。這兩個圖像共同呈現該校特殊的「家校生活」面貌：親師生皆能自在地以其本然面貌所展現的個別性，在學校共同生活。親師生和諧共融、互信互賴的基礎正在於鼓勵個人真實呈現自我的制度與文化。「家校生活」不僅意味著親師生在學校能延續著各自在家庭裡個人化的樣貌，更顯示家庭與學校之間資源互通、成員交流，學校呈現出由一個個學生家庭及教師團成員的家庭所組成的共同體。學校生活能自然融合、連結個人生活的其他面向，個別親師生因而在學校展現出一個個自主自在的完整學習個體的面貌。
二、種籽親子實驗國民小學的內部系統特性及其外部環境關係，如下數端：
（一）結構系統呈現低度科層體制特性
（二）討論文化的底蘊是「支持個別差異的開放文化」與「有機體的合作文化」
（三）教師個人系統與家長、學生個人系統彼此協調而互有影響
（四）政治系統顯現個人範疇權力的運用與組織需求的轉化能解決衝突
（五）學校與地方教育主管機關互動良好但疏於經營與所在社區的關係
三、自我組織（self-organization）的組織本質是種籽親子實驗國民小學穩健存續的因素。以內部系統來看，該校的文化系統強韌並與個人系統協調，使其維持低度科層結構並得以化解組織衝突，內部系統顯現調和一致性。以學校組織的整體系統來看，該校是文化系統運作顯著的開放系統，文化系統具自主性的「調節回饋」本質，使學校形成「自我組織」，能因應內部系統與外部環境的擾動或壓力，得以穩健存續。
四、對於種籽親子實驗國民小學的建議：
（一）親師生合力建構「種籽學」論述，做為自我改革學校變革的系統性基礎
（二）建立師資培育模式，踐行公共化使命
五、本研究對於國民教育的啟示：
（一）朝向彈性的「自我組織」發展，學校更具創新變革能力
（二）建立有利於「自我創化教師」生成的學校環境
（三）親師生共同建構學校信念，形成「信任連結」關係為學校發展基礎
（四）以種籽親子實小的經驗看「實驗教育」的挑戰與因應
1. 「學校評鑑」方式應以協助學校發展為目的，宜更具彈性、因校制宜
2. 主管機關宜促進另類學校與一般學校深度交流或彼此成果分享
3. 種籽親子實驗國民小學的學校運作模式可為偏地小校轉型再生的參考 / This dissertation applies qualitative research method and the “open systems theory” to amplify on an alternative school picture of Seedling Experimental Elementary School, and inquiries the elements on the sustainable development of the alternative school. The results of this dissertation upon the case study on Seedling Experimental Elementary School are as follows.
1. By describing and analyzing the manners and systems of student learning and school operating, this dissertation points out that the school picture of Seedling Experimental Elementary School is home-school life of trustful coupling relationship among parents, teachers, and students.
2. The organizational characteristics of Seedling Experimental Elementary School are as below. (1) It seems as if Seedling Experimental Elementary School is a bureaucratic organization, but just at a modest rate, is not typical bureaucracy. (2) The intrinsic qualities of discussing culture are supporting individual differences and cooperation. (3) The individual systems of parents, teachers, and students are congruent. (4) Invoking individual power and transferring the need for organization can reconcile conflicts in the political system of organization. (5) Seedling Experimental Elementary School has the good relationship with the authorities, but has the aloof relationship with the local community.
3. The innate character of Seedling Experimental Elementary School is “self-organization” that can reconcile the inner systems of the school organization and embrace the challenges or stress come from outer systems. Seedling Experimental Elementary School as a self-organization can be developing steady.
4. This dissertation makes two suggestions to Seedling Experimental Elementary School. First of all, parents, teachers, and students can collectively build the “Seedling knowledge”. Secondly, Seedling Experimental Elementary School can accomplish educational mission for the public by establishing the method and program of teacher education based on “Seedling knowledge”.
5. This dissertation makes some suggestions for national education. (1) The authorities could assist schools to be “self-organization-orientated” school organizations. (2) The authorities could assist schools to cultivate teachers to be “self-creation-orientated” teachers. (3) A school principal could lead parents, teachers, and students to work up the school belief and vision, which may develop trustful coupling relationship that could be the base of school. (4) Three suggestions for experimental education: first, school evaluation for schools which are proceeding with experimental education should be flexible and expediential; secondly, the authorities can boost the communication and promote the cooperation between alternative schools and common schools; finally, the school operating model of Seedling Experimental Elementary School could be the reference and resource for the transformation of small schools in rural.
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Quality assurance challenges for private providers in post-school education and training in South AfricaBaumgardt, Jacqueline 09 1900 (has links)
Quality assurance has been a vexed and troubled journey for private providers in South
Africa in a complex and burdensome educational environment. It is well recognised that
private providers are significant role-players in the provision of education and training in
South Africa and the stated intention is to create a more enabling regulatory framework
The focus of this thesis is on the private providers at the post-school level. The quality
assurance regime was examined and contextualised to analyse what is required, and to
determine how the private provider is impacted by the regulatory requirements for the
establishment and operation of a private tuition provider in South Africa. The experience of
private providers, CEOs of professional bodies, ETQA managers and ETD practitioners was
investigated using a mixed methods research approach.
The conclusion is a call for a far more streamlined system with a centralised oversight body,
greater stakeholder consultation, less political interference and a deeper appreciation for the
contribution that private providers make to the education of learners in South Africa. / Educational Leadership and Management / D. Ed. (Education Management)
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El Control de gestión en organizaciones sin ánimo de lucro: el caso particular de los colegios de economistas de EspañaSoldevila García, Pilar 05 July 2000 (has links)
Esta investigación ha identificado los instrumentos de contabilidad de gestión que los gestores de las organizaciones no lucrativas, y más concretamente de los colegios de economistas de España, utilizan y pueden utilizar como sistemas de información para el control de la gestión y para la mejora de su eficiencia, eficacia y economía. Se han realizado tres estudios empíricos: 1. A los gestores de los colegios de economistas, para conocer situación y nivel de implantación de instrumentos de control de gestión .2. Se ha centrado en el análisis de la situación a nivel también de instrumentos de contabilidad de gestión de determinadas asociaciones inglesas que están destinadas a profesionales que ejercen en especialidades que en España pueden realizar los economistas. 3. A usuarios de los colegios, par ver nivel de calidad de los servicios y actividades que los colegios realizan y los efectos de la profesionalidad múltiple que los caracteriza. / It presents the results of a study about management control in non-profit organizations, focusing on the particular case of the Associations of Economists in Spain. In order to do it, a revision of literature and empirical studies have taken place to find out the implementation and level development of the instruments of management accounting in non-profit organizations. The study has been completed with three empirical studies, first directed to Associations of Economists in Spain, the second to associations from the UK related to the economy and the company, and, third directed to users from an Economists'Professional Association. Moreover, interviews of managers of different Associations from the UK have been made.
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