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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.
61

Inverse position solutions, workspace, and resolved rate control of all possible 3-DOF parallel planar manipulators

Shelley, Brett January 1996 (has links)
No description available.
62

Kan du vara dig själv på din arbetsplats? : En kvalitativ studie om homosexuell vårdpersonals uppfattning om attvara öppen med sin sexuella läggning

Lofthagen Norbjer, Sabina, Strömbeck, Fanny January 2022 (has links)
As a result of society's heteronorm many homosexuals do not want to be open with their sexual orientation in the workplace. Healthcare in Sweden has been criticized as there is a general assumption among healthcare professionals that patients are heterosexual. As a result, homosexual patients have received inadequate treatment from healthcare staff. The purpose of the study is to research homosexual healthcare staff's perceptions of the organization's impact on inclusion based on sexual orientation. The purpose is also to study the healthcare staff's perception of being open with their sexual orientation towards work colleagues. How workplace norms affect the openness of homosexual healthcare staff regarding their sexual orientation to colleagues in the workplace is also researched. With the help of qualitative interviews with homosexual care staff, the purpose of the study can be answered. The heteronorm is not a new phenomenon and it still affects society today. However, society is not as heteronormative as before. Even though change has taken place, not all organizations work actively with inclusion based on sexual orientation in the workplace. Working with inclusion can be considered important as previous research shows that many homosexuals do not dare to be open with their sexual orientation in the workplace. The results of the study show that homosexual healthcare staff have different perceptions about being open with their sexual orientation towards work colleagues. There are occasions where the healthcare staff have experienced negative attitudes among colleagues towards homosexuality. But for the most part the healthcare staff have a positive perception of being open with their sexual orientation to work colleagues. / Samhällets heteronorm leder till att många homosexuella personer inte vågar vara öppna med sin sexuella läggning på arbetsplatsen. Sjukvården i Sverige har fått kritik då det finns ett generellt antagande hos vårdpersonal att patienter är heterosexuella. Till följd av det har homosexuella patienter fått ett bristande bemötande av vårdpersonal. Studiens syfte är att studera homosexuell vårdpersonals uppfattning av organisationens inverkan på inkludering utifrån sexuell läggning. Syftet är även att studera vårdpersonals uppfattning om att vara öppen med sin sexuella läggning för kollegor samt hur arbetsplatsens normer påverkar homosexuell vårdpersonals öppenhet med sin sexuella läggning för kollegor. Med hjälp av kvalitativa intervjuer med homosexuell vårdpersonal kan studiens syfte besvaras. Heteronormen är inget nytt fenomen och påverkar fortfarande samhället idag. Dock är samhället inte lika heteronormativt som förr. Trots att förändringar har skett arbetar inte alla organisationer aktivt med inkludering utifrån sexuell läggning på arbetsplatser. Inkluderingsarbete kan anses viktigt då tidigare forskning visar att många homosexuella inte vågar vara öppna med sin sexuella läggning på arbetsplatsen. Studiens resultat visar att homosexuell vårdpersonal har olika uppfattningar om att vara öppen med sin sexuella läggning för kollegor. Det finns enstaka tillfällen då vårdpersonal upplevt negativa attityder från kollegor på grund av homosexualiteten. Men för det mesta har vårdpersonalen en positiv uppfattning om att vara öppen med sin sexuella läggning för kollegor.
63

Distributed Collaboration on Versioned Decentralized RDF Knowledge Bases

Arndt, Natanael 30 June 2021 (has links)
Ziel dieser Arbeit ist es, die Entwicklung von RDF-Wissensbasen in verteilten kollaborativen Szenarien zu unterstützen. In dieser Arbeit wird eine neue Methodik für verteiltes kollaboratives Knowledge Engineering – „Quit“ – vorgestellt. Sie geht davon aus, dass es notwendig ist, während des gesamten Kooperationsprozesses Dissens auszudrücken und individuelle Arbeitsbereiche für jeden Mitarbeiter bereitzustellen. Der Ansatz ist von der Git-Methodik zum kooperativen Software Engineering inspiriert und basiert auf dieser. Die Analyse des Standes der Technik zeigt, dass kein System die Git-Methodik konsequent auf das Knowledge Engineering überträgt. Die Hauptmerkmale der Quit-Methodik sind unabhängige Arbeitsbereiche für jeden Benutzer und ein gemeinsamer verteilter Arbeitsbereich für die Zusammenarbeit. Während des gesamten Kollaborationsprozesses spielt die Data-Provenance eine wichtige Rolle. Zur Unterstützung der Methodik ist der Quit-Stack als eine Sammlung von Microservices implementiert, die es ermöglichen, die Semantic-Web-Datenstruktur und Standardschnittstellen in den verteilten Kollaborationsprozess zu integrieren. Zur Ergänzung der verteilten Datenerstellung werden geeignete Methoden zur Unterstützung des Datenverwaltungsprozesses erforscht. Diese Managementprozesse sind insbesondere die Erstellung und das Bearbeiten von Daten sowie die Publikation und Exploration von Daten. Die Anwendung der Methodik wird in verschiedenen Anwendungsfällen für die verteilte Zusammenarbeit an Organisationsdaten und an Forschungsdaten gezeigt. Weiterhin wird die Implementierung quantitativ mit ähnlichen Arbeiten verglichen. Abschließend lässt sich feststellen, dass der konsequente Ansatz der Quit-Methodik ein breites Spektrum von Szenarien zum verteilten Knowledge Engineering im Semantic Web ermöglicht.:Preface by Thomas Riechert Preface by Cesare Pautasso 1 Introduction 2 Preliminaries 3 State of the Art 4 The Quit Methodology 5 The Quit Stack 6 Data Creation and Authoring 7 Publication and Exploration 8 Application and Evaluation 9 Conclusion and Future Work Bibliography Web References List of Figures List of Tables List of Listings List of Definitions and Acronyms List of Namespace Prefixes / The aim of this thesis is to support the development of RDF knowledge bases in a distributed collaborative setup. In this thesis, a new methodology for distributed collaborative knowledge engineering – called Quit – is presented. It follows the premise that it is necessary to express dissent throughout a collaboration process and to provide individual workspaces for each collaborator. The approach is inspired by and based on the Git methodology for collaboration in software engineering. The state-of-the-art analysis shows that no system is consequently transferring the Git methodology to knowledge engineering. The key features of the Quit methodology are independent workspaces for each user and a shared distributed workspace for the collaboration. Throughout the whole collaboration process data provenance plays an important role. To support the methodology the Quit Stack is implemented as a collection of microservices, that allow to integrate the Semantic Web data structure and standard interfaces with the distributed collaborative process. To complement the distributed data authoring, appropriate methods to support the data management process are researched. These management processes are in particular the creation and authoring of data as well as the publication and exploration of data. The application of the methodology is shown in various use cases for the distributed collaboration on organizational data and on research data. Further, the implementation is quantitatively compared to the related work. Finally, it can be concluded that the consequent approach followed by the Quit methodology enables a wide range of distributed Semantic Web knowledge engineering scenarios.:Preface by Thomas Riechert Preface by Cesare Pautasso 1 Introduction 2 Preliminaries 3 State of the Art 4 The Quit Methodology 5 The Quit Stack 6 Data Creation and Authoring 7 Publication and Exploration 8 Application and Evaluation 9 Conclusion and Future Work Bibliography Web References List of Figures List of Tables List of Listings List of Definitions and Acronyms List of Namespace Prefixes
64

Separating Post-perceptual Processes From Auditory Awareness : An Electrophysiological Study With a No-response Task

Fjordstig, Andréas January 2019 (has links)
Two theories of consciousness have different ideas about when consciousness happens and what neural processes enable conscious experience. The recurrent processing theory supports an early onset of consciousness caused by recurring loops of information between sensory areas. Contrary to this belief, the global workspace theory claims that consciousness appears later, through global recurrent loops of information between sensory and higher order brain areas such as the visual cortex and frontoparietal areas. Electrophysiological studies have found an event-related negativity arising in primary visual areas around 200 ms that correlates to awareness. This activity suits the predictions of an early onset of consciousness made by the recurrent processing theory. It is followed by a later positive amplitude appearing around 400 ms. This activity is in line with predictions made by the global workspace theory. The current study transition from visual to auditory awareness research in order to find the neural correlates of consciousness in audition. A sound detection task with tones calibrated to each participants threshold value was used in the experiment and two electrophysiological measurements of auditory awareness were found. An auditory awareness negativity that appears around 200 ms after stimulus onset and a late positivity appearing around 400 ms. Researchers disagree about if these event-related potentials correlate with awareness or unrelated cognitive mechanisms. In order to solve this problem, the current experiment was devised to test if they were affected by response conditions. A no-response paradigm with reversed response conditions was used to separate pre- and post-conscious mechanisms from the auditory awareness negativity and the late positivity. Results showed that auditory awareness negativity was independent of response condition and thus free from post-perceptual processes. The late positivity amplitude seems to be dependent on response condition but the result was inconclusive.
65

Vers des robots et machines parallèles rapides et précis / Towards Rapid and Precise Parallel Kinematic Machines

Shayya, Samah Aref 19 February 2015 (has links)
Les machines parallèles (MPs) existent depuis plus d'un demi-siècle et ils ont fait l'objet d'études intensives. Par opposition avec leurs homologues de structure série, ces mécanismes sont constitués de plusieurs chaînes cinématiques qui relient la base fixe à la plateforme mobile. L'intérêt de ces architectures s'explique par les nombreux avantages qu'elles offrent, parmi lesquels: une rigidité élevée, un rapport important charge/poids global, des capacités dynamiques élevées en raison des masses en mouvement réduites (en particulier lorsque les actionneurs sont sur ou près de la base), une meilleure précision, des fréquences propres plus élevées, etc. Néanmoins, leur exploitation comme machines-outils reste timide et limitée, et le plus souvent elles ne dépassent pas le stade d'étude et de prototype de laboratoires universitaires ou de fabricants de machines-outils. Les principaux inconvénients qui entravent la généralisation des MPs dans l'industrie sont les suivants: un espace de travail limité, des débattements angulaires réduits, la présence de configurations singulières, la complexité de conception, les difficultés d'étalonnage, les problèmes causés par les collisions, la complexité du contrôle/commande (en particulier dans le cas de redondance à actionnement), etc. De plus, si les MPs ont rencontré un grand succès dans les applications de pick-and-place grâce à leur rapidité (capacité d'accélération), leur précision reste inférieure à ce qui a été prévu initialement. Par ailleurs, on trouve également des MPs de très précision, mais malheureusement avec de faibles performances dynamiques. En partant du constat précédant, cette thèse se concentre sur l'obtention de MPs avec un bon compromis entre rapidité et précision. Nous commençons par donner un aperçu de la bibliographie disponible concernant MPs et les avancées majeures dans ce domaine, tout en soulignant les limites de performance des MPs, ainsi que les limites des outils de conception classique. En outre, nous insistons sur les outils d'évaluation des performances, et montrons leurs limites dès qu'il s'agit de traiter le cas de la redondance ou l'hétérogénéité des degrés de liberté (ddl). En effet, si la synthèse architecturale est un point dur de la conception de MPs, la synthèse dimensionnelle reposant sur des indices de performances réellement significatifs l'est également. Par conséquent, de nouveaux indices de performance sont proposés pour évaluer la précision, les capacités cinétostatiques et dynamiques des manipulateurs de manière générale qui apportent des solutions aux difficultés évoquées ci-dessus. Par la suite, plusieurs nouvelles architectures 3T-2R et 3T-1R (T: signifie ddl en translation et R signifie un ddl de rotation) sont présentées, à savoir MachLin5, ARROW V1, et ARROW V2 et ses versions dérivées ARROW V2 M1 et M2. En outre, la synthèse dimensionnelle d'ARROW V2 M2 est réalisée, et les performances de la machine sont évaluées. Finalement, des améliorations futures concernant la précision sont proposées au regard de premiers résultats obtenus sur le prototype. / Parallel manipulators (PMs) have been there for more than half a century and they have been subject of intensive research. In comparison with their serial counterparts, PMs consist of several kinematic chains that connect the fixed base to the moving platform. The interest in such architectures is due to the several advantages they offer, among which we mention: high rigidity and payload-to-weight ratio, elevated dynamical capabilities due to reduced moving masses (especially when the actuators are at or near the base), better precision, higher proper frequencies, etc. Nevertheless, despite of the aforementioned merits, their exploitation as machine tools is still timid and limited, in which they most often do not exceed the research and prototyping stages at university laboratories and machine tool manufacturers. The main drawbacks that hinder the widespread of parallel kinematic machines (PKMs) are the following: limited operational workspace and tilting capacity, presence of singular configurations, design complexities, calibration difficulties, collision-related problems, sophistication of control (especially in the case of actuation redundancy), etc. Besides, though PMs have met a great success in pick-and-place applications, thanks to their rapidity (acceleration capacity), still their precision is less than what has been initially anticipated. On the other hand, extremely precise PMs exist, but unfortunately with poor dynamic performance. Starting from the aforementioned problematics, the current thesis focuses on obtaining PKMs with a good compromise between rapidity and precision. We begin by providing a survey of the available literature regarding PKMs and the major advancements in this field, while emphasizing the shortcomings on the level of design as well as performance. Moreover, an overview on the state of the art regarding performance evaluation is presented and the inadequacies of classical measures, when dealing with redundancy and heterogeneity predicaments, are highlighted. In fact, if finding the proper architectures is one of the prominent issues hindering PKMs' widespread, the performance evaluation and the criteria upon which these PKMs are dimensionally synthesized are of an equal importance. Therefore, novel performance indices are proposed to assess precision, kinetostatic and dynamic capabilities of general manipulators, while overcoming the aforementioned dilemmas. Subsequently, several novel architectures with 3T-2R and 3T-1R degrees of freedom (T and R signify translational and rotational degrees of freedom), namely MachLin5, ARROW V1, and ARROW V2 with its mutated versions ARROW V2 M1/M2, are presented. Furthermore, the dimensional synthesis of the executed PKM, namely ARROW V2 M2, is discussed with its preliminary performances and possible future enhancements, particularly regarding precision amelioration.
66

Measuring Closeness to Singularities of Parallel Manipulators with Application to the Design of Redundant Actuation

Voglewede, Philip Anthony 16 April 2004 (has links)
At a platform singularity, a parallel manipulator loses constraint. Adding redundant actuation in an existing leg or new leg can eliminate these types of singularities. However, redundant manipulators have been designed with little attention to frame invariant techniques. In this dissertation, physically meaningful measures for closeness to singularities in non-redundant manipulators are developed. Two such frameworks are constructed. The first framework is a constrained optimization problem that unifies seemingly unrelated existing measures and facilitates development of new measures. The second is a clearance propagation technique based on workspace generation. These closeness measures are expanded to include redundancy and thus can be used as objective functions for designing redundant actuation. The constrained optimization framework is applied to a planar three degree of freedom redundant parallel manipulator to show feasibility of the technique.
67

Universal design of behind-the-counter workspaces

Kar, Gourab 20 January 2011 (has links)
This design thesis is part of CATEA's RERC workplace accommodations grant, and it adopts a human centered design methodology to research, develop, test and evaluate designs of behind-the-counter workspaces that maximize independence and participation of employees and increase their employment possibilities. Preliminary research shows that current designs of behind-the-counter workspaces do not accommodate needs of intended employees including the seated and standing users. According to the research, factors like task design and lack of ease of use have contributed to job loss and reduced employment. Through participatory research techniques and ergonomic studies, this project identified accessibility and usability needs and outlined basic and extended design guidelines for behind-the-counter workstations that would address these needs. Results from observational research, usability studies and user interviews were analysed to create design specifications for a range of workstations. The resulting workstation designs incorporate universal design guidelines and aim to expand employment opportunities for people with disabilities and older adults.
68

Integrating safety and BIM: automated construction hazard identification and prevention

Zhang, Sijie 27 August 2014 (has links)
Safety of workers in the construction environment remains one of the greatest challenges faced by the construction industry today. Activity-based hazard identification and prevention is limited because construction safety information and knowledge tends to be scattered and fragmented throughout safety regulations, accident records, and experience. With the advancement of information technology in the building and construction industry, a missing link between effective activity-level construction planning and Building Information Modeling (BIM) becomes more evident. The objectives of this study are 1) to formalize the safety management knowledge and to integrate safety aspects into BIM, and 2) to facilitate activity-based hazard identification and prevention in construction planning. To start with, a Construction Safety Ontology is created to organize, store, and re-use construction safety knowledge. Secondly, activity-based workspace visualization and congestion identification methods are investigated to study the hazards caused by the interaction between activities. Computational algorithms are created to process and retrieve activity-based workspace parameters through location tracking data of workers collected by remote sensing technology. Lastly, by introducing workspace parameters into ontology and connecting the ontology with BIM, automated workspace analysis along with job hazard analysis are explored. Results indicate that potential safety hazards can be identified, recorded, analyzed, and prevented in BIM. This study integrates aspects of construction safety into current BIM workflow, which enables performing hazard identification and prevention early in the project planning phase.
69

Striving to make sense of Digitalisation in Education : An anthropological study of implementing technology in a school setting

Hildonen, Tanja January 2020 (has links)
This thesis investigates how digitalisation impacts school as a place to work and learn byexploring how a few teachers experience digital tools and platforms in their daily work andteaching, both when reflecting upon current state and thinking about the future. A widerperspective of digitalisation in society and education is added by interviewing a learningstrategist as well as including other material covering the current debate. The analysis is guidedby six futural orientations (anticipation, expectation, speculation, potentiality, hope anddestiny) shown in the activities, leaning on a theoretical framework of anthropology of future,work and technology, human agency and intersubjectivity, humanity in a digital age as well asteacher’s role and identities. Hence uncovering examples of how lifeworlds are created andevolve in a school setting, human agency and shifting identities as a teacher manifesting itselfwhen managing conflicting priorities or faulty processes, and how to make sense of beinghuman in a digital age with an awareness of digital wellbeing.
70

Posouzení informačního systému firmy a návrh změn / Information System Assessment and Proposal of ICT Modification

Kubík, Lubomír January 2021 (has links)
The diploma thesis focuses on the assessment of the information system of a developing marketing agency and subsequent proposals for the improvement of its components. The theoretical part describes the importance of the information system in the company, its components and methods of distribution. The analytical part deals with strategic analysis of the company and its surroundings and a description of the current state of the company's information systems. The final part deals with changes proposed to improve the situation in the field of information systems and economic assessment of the changes proposed.

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