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1

Lundgren, Joel, and Jörgen Stegard. "Vi kan komma hem till dig : Att beskriva hur akutpsykiatrisk vård påverkas av att utföras i hemmiljö." Thesis, Ersta Sköndal högskola, Institutionen för vårdvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:esh:diva-4644.

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Bakgrund: Hemsjukvård har bedrivits i Sverige sedan 1970-talet. Inom den somatiska vården ser man detta som en vårdform som stärker patientinflytande. Trots att psykisk ohälsa utgör den största orsaken till sjukskrivning i Sverige ser man inte samma utbyggnad av hemsjukvården inom psykiatrin. Istället bedrivs akutpsykiatrisk vård fortfarande mestadels som slutenvården. Detta trots att man vet att många patientgrupper far illa av att vistas inom den psykiatriska avdelningsmiljön. Ny lagstiftning öppnar dock upp för en utbyggnad även av akutpsykiatrisk hemsjukvård. Syfte: Att beskriva hur akutpsykiatrisk vård påverkas av att utföras i hemmiljö, dels för patienten och dels ur ett organisatoriskt/strukturellt perspektiv. Metod: En litteraturöversikt utifrån en analys av tolv vetenskapliga artiklar med både kvalitativ och kvantitativ design. Resultat: Akutpsykiatrisk hemsjukvård skapar i de flesta fall positiva erfarenheter jämfört med den vård som ges på sjukhusförlagda psykiatriska akutmottagningar.  Patienter och anhöriga blir nöjdare. Vården når patienterna tidigare och sparar betydande summor på minskade slutenvårdsinläggningar. Den kan dock inte helt ersätta slutenvård utan kompletterar denna. Det uppstår även en del negativa upplevelser och effekter, som ibland förefaller motsägelsefulla. Diskussion: Utifrån Dorothea Orems teori om egenvårdsbalans granskas de artiklar som valts ut och två huvudsakliga teman behandlas: Den dörrvaktande funktionen samt vårdandet i akutpsykiatrisk hemsjukvård. Det förefaller som om en maktförskjutning, från vårdgivaren till patienten, är fundamentet i vad som skapar fördelar med hemsjukvård vid akutpsykiatriska tillstånd. En bidragande orsak till de förbättrade behandlingsresultaten tycks vara tidigare upptäckt av psykisk ohälsa på grund av ökad tillgänglighet. Vårdformen fick således en oväntad preventiv effekt som minskar psykisk ohälsa. Det förefaller som att det ibland finns en konflikt mellan vårdandet och kostnadseffektiviteten. Nackdelar som lyfts fram är ökat ansvar för patienter och anhöriga och en otrygg arbetssituation för vårdpersonalen.
Background: Since the 1970s home based care has been carried out in Sweden. In somatic care this is regarded as a form of care that strengthens the patient´s influence. Although mental disorders are the main cause of sick leave in Sweden, one can´t see the same expansion of home based care within psychiatric care. Emergency psychiatric care is instead mostly conducted as inpatient care. This is despite knowing that many groups of patients are harmed by staying in the environment of a psychiatric ward. New legislation will open up for an expansion of psychiatric emergency home care with inpatient standard. Aim: To describe how emergency psychiatric care is affected by being cared out in a home environment, for patients and from an organizational/structural perspective.  Method: A literature review based on an analysis of twelve scientific articles with both qualitative and quantitative design. Result: In most cases emergency psychiatric home care creates a positive experience compared to the care given in hospital based psychiatric emergency care. Patients and relatives are more satisfied. The care reaches patients earlier and saves considerable amounts of money on reduced inpatient admissions. However, it can´t completely replace inpatient care but complement it. Psychiatric home care also creates some negative experiences, which sometimes seems contradictory.  Discussion: Based on Dorothea Orem´s Self-care Deficient Nursing Theory the selected items are examined and the two main themes are created: gatekeeping and caregiving in acute psychiatric home care. It seems that a shift of power from the caregiver to the patient is the basis of what creates advantages of home care for acute psychiatric conditions. One factor contributing to the improved treatment outcomes seems to be earlier detection of mental health problems based on increased accessibility. This preventive effect on mental health was unexpected. It appears that there sometimes is a conflict between caring and cost-effectiveness. Disadvantages highlighted are the increased responsibility for patients and families, and a precarious job situation for caregivers.
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Ruff, Andreas. "Mobile Electronic Administration : kommunale Verwaltungsleistungen mobil über Internet /." Hamburg : Kovač, 2006. http://www.verlagdrkovac.de/3-8300-2509-2.htm.

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Figge, Stefan. "Innovatives Mobile Marketing : kontextabhängige Kundenansprache mit Hilfe mobiler Portale /." Hamburg : Kovač, 2007. http://www.verlagdrkovac.de/978-3-8300-2652-5.htm.

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Figge, Stefan. "Innovatives mobile marketing kontextabhängige Kundenansprache mit Hilfe mobiler Portale." Hamburg Kovač, 2006. http://www.verlagdrkovac.de/978-3-8300-2652-5.htm.

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Šabata, David. "Letecká hra pro Android." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236377.

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This work deals with flight game development on Android platform. Firstly the possibilities of native development and development using Libgdx library will be discussed. Then flight mechanics of a real aircraft and simplified mechanics used in flight games will be explained. The work will also summarize current trends in mobile flight game controls and will propose a new control method based on touch input. Using this method a flight game will be designed and implemented. In the end of this work the process of testing and publishing will discussed, as well as possibilities of further development.
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6

Pärsdotter, My. "Hej bokbussen! : Bokbussens roller i Västerås." Thesis, Linnéuniversitetet, Institutionen för kulturvetenskaper (KV), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70895.

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The aim of this bachelor's thesis is to examine the roles of the mobile library in Västerås municipality in Sweden. The purpose is to gain understanding about the mobile library and its place in the local public library operation. The theoretical framework is the model for analysis of the local public library profile, produced by Marianne Andersson and Dorte Skot-Hansen. Qualitative interviews are put in comparison with the four overlapping categories included in said model: the role as a cultural centre, knowledge centre, information centre and social centre. The results show that each of the four roles was recognized to some degree, though the roles as cultural centre and social centre were somewhat prominent. The respondents mainly highlighted the lack of information technology and the limited physical space as the major holdbacks for development opportunities in all categories. The findings are discussed along with their relations to national and local policy documents.
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Věčorek, David. "Mobilní aplikace s predikcemi výsledků e-Sports utkání." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255452.

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E-Sports, also known as progaming (professional gaming) has grown a lot in the last few years. Professional gamers are regularly attending tournaments watched by hundreds of thousands of fans and with prize pools of millions of dollars. There are many video broadcasts of those events and recently betting on e-Sports has also become available. The main goal of this thesis was to create a mobile app for OS Android, which aims to utilize this growth and create a service of providing predictions of results of the e-Sports matches, similar to that existing in regular sports. The application in its current form receives the predictions via Google Cloud Messaging service and shows an Android notification on their arrival. The predictions are then stored on the device into SQLite database so they are available for further view and filtering. After the matches are finished, their results are shown in comparison to the predictions and balance of the predictions is calculated. Users can display information about their subscriptions and predictions under that subscriptions. The app was created in Android Studio IDE with appearance based on the material design guidelines. The app was tested on several devices of different brand and Android version, then it was placed on Google Play for open beta testing. In the future the app will be offered to the users of the service of providing predictions of results of the e-Sports matches.
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Kruppa, Michael. "Migrating characters: effective user guidance in instrumented environments." Berlin Aka, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2898568&prov=M&dok_var=1&dok_ext=htm.

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Blankenbach, Jörg. "Handbuch der mobilen Geoinformation Architektur und Umsetzung mobiler standortbezogener Anwendungen und Dienste unter Berücksichtigung von Interoperabilität." Heidelberg Wichmann, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2987777&prov=M&dok_var=1&dok_ext=htm.

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Teilw. zugl.: Darmstadt, Techn. Univ., Diss., 2006 u.d.T.: Blankenbach, Jörg: Architektur und Umsetzung mobiler standortbezogener Anwendungen und Dienste unter Berücksichtigung von Interoperabilität
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Mölleryd, Bengt G. "Entrepreneurship in technological systems : the development of mobile telephony in Sweden /." Stockholm Economic Research Institute, Stockholm School of Economics [Ekonomiska forskningsinstitutet vid Handelshögsk.] (EFI), 1999. http://www.hhs.se/efi/summary/523.htm.

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Grandjot, Thorsten. "Mobile scorecard Entwicklung einer balanced scorecard für das mobile Customer-relationship-Management (mCRM)." München Mering Hampp, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2826564&prov=M&dok_var=1&dok_ext=htm.

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Schierholz, Ragnar. "Mobile Kundeninteraktion bei Dienstleistungsunternehmen /." Berlin : Pro Business, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2930792&prov=M&dok_var=1&dok_ext=htm.

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Poppendiek, Nils. "Mobile Bezahlmechanismen : Konzepte und Technologien /." Saarbrücken : VDM Verl. Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2983519&prov=M&dok_var=1&dok_ext=htm.

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Krappitz, Matthias Kiesendahl Jana. "Mobile Musik-Distribution Grundlagen, Erfolgsfaktoren, Perspektiven." Saarbrücken VDM, Müller, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2717319&prov=M&dok_var=1&dok_ext=htm.

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Arkhipov, Alexander. "IFDMA for uplink mobile radio communication systems." München Utz, 2010. http://deposit.d-nb.de/cgi-bin/dokserv?id=3440635&prov=M&dokv̲ar=1&doke̲xt=htm.

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Wasinger, Rainer. "Multimodal interaction with mobile devices: fusing a broad spectrum of modality combinations." Berlin Aka, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2890796&prov=M&dok_var=1&dok_ext=htm.

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Cepa, Vasian. "Attribute enabled software development illustrated with mobile software applications." Saarbrücken VDM, Müller, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?id=2939598&prov=M&dok_var=1&dok_ext=htm.

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Cepa, Vasian. "Attributed enabled software development : illustrated with mobile software applications /." Saarbrücken : VDM, Verl. Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2939598&prov=M&dok_var=1&dok_ext=htm.

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Traczinski, Holger. "Integration von Algorithmen und Datentypen zur validierten Mehrkörpersimulation in MOBILE." Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917159&prov=M&dok_var=1&dok_ext=htm.

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Wegener, Michael. "Konstruktion einer Markterfolgsanalysemethodik für Mobile-Entertainment-Anbieter : Ableitung einer eklektischen Methodik auf Basis einer stufenweisen Fokussierung des Analyseobjektes und einer forschungshistorischen Reflektion inhaltlicher und methodischer Erkenntnisgewinne relevanter Markterfolgsanalysemethodiken des Marketing und strategischen Management /." München ; Mering : Hampp, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2832291&prov=M&dok_var=1&dok_ext=htm.

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Guenkova-Luy, Teodora. "Multimedia networking coordination of multimedia services in next generation mobile networks." Saarbrücken VDM, Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3037222&prov=M&dok_var=1&dok_ext=htm.

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Steinhaus, Peter. "Navigation mobiler Systeme in dynamischen Umgebungen auf der Basis verteilter Sensoren /." Waabs : GCA-Verl, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2760949&prov=M&dok_var=1&dok_ext=htm.

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Gorecki, Christian Alexander. "Beiträge zur sicheren Kommunikation mobiler Systeme." Berlin Logos-Verl, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2780254&prov=M&dok_var=1&dok_ext=htm.

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Schwab, Andreas. "Synchronising via SOA : using a service-oriented architecture to synchronise mobile agents /." Saarbrücken : VDM Verlag Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3041931&prov=M&dok_var=1&dok_ext=htm.

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Höpfner, Hagen. "Relevanz von Änderungen für Datenbestände mobiler Clients /." Saarbrücken : VDM Verlag Dr. Müller, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3041780&prov=M&dok_var=1&dok_ext=htm.

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Meinberg, Ralf. "Voice over IP : IP-basierter Sprachdienst vor dem Hintergrund des novellierten TKG /." Münster : LIT-Verl, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3168567&prov=M&dok_var=1&dok_ext=htm.

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Liemich, Markus. "Transfer von Unternehmenskultur : eine empirische Untersuchung am Beispiel des deutsch-russischen Joint Ventures "Mobile TeleSystems"." Köln Kölner Wiss.-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2855581&prov=M&dokv̲ar=1&doke̲xt=htm.

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Riegelmayer, Wolfgang P. "IN - eine verteilte Service-Plattform mobiler Prozessarchitekturen für verkehrstelematische Anwendungen." Dresden TUDpress, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2774366&prov=M&dok_var=1&dok_ext=htm.

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Knoche, Guido. "Untersuchungen zur Kalkabscheidung aus Grundwasser von Aquiferwärmespeichern mit einem mobilen Testgerät." München Oldenbourg-Industrieverl, 2004. http://deposit.ddb.de/cgi-bin/dokserv?id=2669571&prov=M&dok_var=1&dok_ext=htm.

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Steinhaus, Peter. "Navigation mobiler Systeme in dynamischen Umgebungen auf der Basis verteilter Sensoren." Waabs GCA-Verl, 2004. http://deposit.ddb.de/cgi-bin/dokserv?id=2760949&prov=M&dok_var=1&dok_ext=htm.

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Lafrenz, Reinhard Werner. "Perzeption, Umweltmodellierung und Aktionsplanung in einem Team kooperativer, autonomer mobiler Roboter." Berlin Logos-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3049399&prov=M&dok_var=1&dok_ext=htm.

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Kolín, Tomáš. "Windows Phone 7 aplikace s backendem na Windows Azure." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124672.

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The main objective of this diploma thesis is to design and develop a cloud hosted service that allows developers of games for Windows Phone 7 platform to extend their products with social and competitive aspect using Platform as a Service solution Windows Azure for hosting the backend of this system. The first part of the thesis analyses systems that are available on the market and that are providing similar services for the target platform. Based on this analysis, functional and general requirements for the future application are specified in the second part. Based on these requirements, use case analysis is made. The third part of the thesis is dedicated to description of the most important features, APIs and specifics of the Windows Phone 7 software platform. The fourth part is dedicated to Windows Azure as a Cloud platform both in terms of most important services, their characteristics and APIs used to utilise them and in terms of their business and pricing conditions. The fifth part addresses the architecture and the most important implementation details of the application. The final part contains the user guide for both the Windows Phone 7 application and for developers interested in using the library containing the API during the development of their game. The output of this thesis is the designed and implemented application with client-server architecture ready to have its backend deployed in Windows Azure environment and to have its frontend deployed on Windows Phone 7 devices. The client part of the system is comprised of a library intended for developers of games, which encapsulates the API needed to access the backend on the Internet, and a graphic frontend intended for end users. The server part, which contains most of the application logic, has REST interface. The applications architecture allows future development in terms of new functionality and expansion on more client platforms.
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Toptsis, Ioannis. "Multimodale Dialogsteuerung für Roboteranwendungen." Berlin Logos-Verl, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2762590&prov=M&dok_var=1&dok_ext=htm.

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Pauly, Daniel A. "M-Commerce und Verbraucherschutz die Umsetzung der verbraucherschutzrechtlichen Transparenz- und Informationspflichten im mobilen elektronischen Handel." Oldenburg Lehrstuhl für Bürgerliches Recht, Handels- und Wirtschaftsrecht sowie Rechtsinformatik, Inst. für Rechtswiss, 2004. http://deposit.ddb.de/cgi-bin/dokserv?id=2658364&prov=M&dok_var=1&dok_ext=htm.

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Rosati, Vittorio. "Modellistica numerico-idraulica della Rienza: simulazione della piena causata dalla tempesta Vaia (26-30 ottobre 2018)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Nel presente elaborato di Tesi si descrive il frutto del lavoro svolto durante un approfondito studio, nel quale si è implementato un modello numerico-idraulico finalizzato alla rappresentazione dei fenomeni di trasporto solido in un tratto del fiume Rienza durante tempesta Vaia (26-30 ottobre 2018). Si sono prima descritti in modo teorico gli argomenti trattati, analizzando i principi dello studio delle correnti a pelo libero e del trasporto solido, associandoli alla teoria del calcolo numerico per la risoluzione delle equazioni che descrivono il fenomeno del trasporto solido in ambiente HEC-RAS. Dopo aver caratterizzato l’area geografica e l’evento di interesse si è passati all’implementazione del modello, elencando le considerazioni necessarie per il suo funzionamento. Anzitutto è stato necessario caratterizzare con la massima precisione la geometria del modello, definendo gli estremi del tratto di fiume studiato, le sezioni trasversali, i limiti del canale principale e delle aree golenali e i coefficienti di scabrezza. Successivamente, si sono svolte due tipologie di simulazione, la prima in moto stazionario a fondo fisso e la seconda in moto non stazionario e a fondo mobile (ovvero riproduzione dei fenomeni di erosione e deposito). La prima tipologia è stata utilizzata per ottimizzare i valori di scabrezza mentre la seconda per studiare la distribuzione dei sedimenti nel tratto di fiume d’interesse. Il modello è risultato qualitativamente attendibile, ma non rispecchia integralmente la natura dei fenomeni simulati, per una serie di limiti del software e per l’insolita tipologia di evento analizzato.
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Werner, Jutta. "Nomades entre marginalisation, entreprenariat et conflits : stratégies des éleveurs mobiles du sud du Maroc face aux bouleversements du contexte pastoral et aux impératifs d'un développement durable /." Weikersheim : Margraf, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2769910&prov=M&dok_var=1&dok_ext=htm.

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Werner, Jutta. "Nomades entre marginalisation, entreprenariat et conflits stratégies des éleveurs mobiles du sud du Maroc face aux bouleversements du contexte pastoral et aux impératifs d'un développement durable." Weikersheim Margraf, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2769910&prov=M&dok_var=1&dok_ext=htm.

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Deljerud, Hampus. "Hållbar energi till mobila hem vintertid : Ett koncept för hållbar energiutvinning, utvald med analytisk metodik." Thesis, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85027.

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Detta projekt har utförts som examinerande moment i kursen: examensarbete för högskoleingenjörsexamen i innovationsteknik och design, MSGC12, 22,5 hp. Projektet inleddes och utfördes av Hampus Deljerud med hjälp av Invencon AB. Handledare på universitetet var Monica Jakobsson, och examinator i kursen var professor Leo de Vin. Ett problem har identifierats att ägare av fritidsfordon har svårt att tillgodose sitt behov av hushållsel under vintern. Under projektet har en rad marknadsundersökningar genomförts där behovet och existerande lösningar har undersökts. Enkäter och andra undersökningsmetoder resulterade i att över hundra respondenter tog sin tid och visade intresse för att svara på frågor och delta i omröstningar. När problemet hade fastställts gjordes en projektplan för att klargöra mål, avgränsningar, milstolpar och deadlines. Detta kompletterades även med riskanalyser i försök att eliminera eventuella fallgropar.  Utifrån litteraturstudier och marknadsundersökningar sammanställdes alla krav i en kravspecifikation. Kravspecifikationen användes för att se till att alla nya koncept uppfyllde alla krav. Idégenereringar utfördes digitalt med hjälp av tre olika grupper över videosamtal. Alla deltagare fick möjlighet att dela sina tankar och idéer direkt över nätet via Google drive. Tjugoen koncept togs fram och sållades ned till fem potentiella lösningar som tillgodosåg de krav som ställdes i kravspecifikationen.   Ett Exceldokument togs fram där väderdata från SMHI användes i en beräkningskalkyl för att hitta den bästa lösningen på grundproblemet. Den bästa lösningen visade sig vara en kombination av energisystem där en del av systemet består av ett hopfällbart vindkraftverk. Vindkraftverkets fällmekanism tar hjälp av generatorn i kraftverket och vajrar. Genom tillämpning av existerande mekanik i dagens vindkraftverk görs konstruktionen med färre delar och resulterar i en lösning som bedöms vara gynnsam ur ett ekonomiskt perspektiv.
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Vacula, Ivan. "Multiplatformní prostředí pro vývoj mobilních her." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-297877.

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Title: Multi-platform environment for mobile-game development Author: Ivan Vacula Department: Department of Software Engineering Supervisor: RNDr. David Bednárek, Ph.D. Supervisor's e-mail address: bednarek@ksi.mff.cuni.cz Abstract: Smart mobile devices are getting more and more popular these days. But there comes a problem with their expansion as well. Mobile operating systems differ from each other, as do mobile devices themselves, so development across multiple platforms is not simple. Situation is even worse when it comes to games. These need to use limited resources of a mobile device as much as possible, taking into account quick response to user actions, graphical execution et cetera. The first goal of this thesis is to compare existing solutions for multi-platform mobile game development. The second goal is to design a new system. This system must ensure targeting of multiple platforms during mobile game development. Included in this thesis is implementation of the system on two vastly different operating systems as well as implementation of a demonstration game. Keywords: multi-platform, mobile, smartphone, game, development
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Mendes, João Paulo Louro. "Outphasing mobile communications transmitter." Master's thesis, 2018. http://hdl.handle.net/10773/26110.

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This dissertation proposes the implementation of an Outphasing PA architecture for mobile communication transmitters. In this work, the main focus is the development of a functional prototype that demonstrates power efficiency improvements at high power back-off, when compared to traditional configurations. The proposed architecture suggests the signal component separator to be implemented in the digital domain, allow the device to become more flexible. Also, unlike the traditional Outphasing, the input power at the branches is not constant: it can change freely to benefit PAE at higher OPBO. The amplifier was implemented using two 10 W GaN HEMT and it obtained a maximum power between 43.42 dBm and 43.73 dBm in bandwidth of [2.25;2.40] GHz (its operational bandwidth). The drain efficiency, the maximum values vary between 64.3 % and 58.4 %, and the maximum PAE between 55.9 % and 58.4 %. For 2.30 GHz, its best operational frequency, PAE is higher than 50 % until -6.0 dB of OPBO. To be able to implement this configuration on a mobile communication system in a less demanding manner for the digital processing unit, the usage of polynomial equations, that describe the power of the input signal into the necessary branch signals, has been studied in this document. In the performed tests, it was observed that the power and the efficiency performances of the PA does not substantially change, even with the usage of low order polynomials. Yet, low order polynomials may compromise the linearity of the amplifier. When tested with a LTE signal with PAPR of 10.33 dB or with a 4-carrier GSM signal with PAPR of 6.2 dB, both with a bandwidth of 10 MHz, the amplifier shows considerable amounts of distortion. That is demonstrated in the three evaluated performance metrics: AM-AM; AM-PM; and ACLR. The average efficiency levels reach 50 % for the GSM signal and 36 % for the LTE one. After digital predistortion was applied, an improvement of the evaluated metric was observed. This scenario was tested for the LTE signal, using the 7th order polynomial in the signal component separator. The ACLR lowered from -21 dBc to -56 dBc; the AM-AM variation from 2.3 dB to 0.6 dB; and the AM-PM variation from 61.0o to 3.2o. This while the average efficiency increased from 30 % to 36 %. In the end, the objectives of this work were concluded, and the produced prototype can equate to some of the state-of-the-art reference works.
Esta dissertação propõe a implementação de uma aquitectura Outphasing de amplificador de potência para transmissores de comunicações móveis. O principal foco do trabalho é a obtenção de um protótipo funcional, que demonstre melhorias em termos de rendimento de potência em regime de back-off, em relação a outras configurações tradicionais. A arquitectura proposta sugere que o separador de sinais seja implementado no domínio digital, conferindo maior versatilidade ao dispositivo. Para alem disso, ao contrario do Outphasing tradicional, a potência dos sinais de entrada dos ramos do PA não e constante: poderá variar livremente para beneficiar o PAE a maiores OPBOs. O amplificador foi implementado usando dois GaN HEMT de 10 W e obteve uma potência máxima entre 43.42 dBm e 43.73 dBm na banda [2.25; 2.40] GHz (a sua banda de operação). Desta forma o amplificador possui 6.5 % de largura de banda. Em termos de rendimento de dreno, os valores máximos variam entre 64.3%e 68.7%, enquanto que o PAE máximo varia entre 55.9%e 58.4%. Para 2.3GHz, a sua melhor frequência de operação, o PAE mantém-se superior a 50 % ate -6.0 dB de OPBO. Para poder implementar esta configuração num sistema de comunicações móveis de forma menos exigente para a unidade de processamento digital, foi estudada a implementação do separador de sinais através de equações polinomiais que traduzam os sinais de entrada do sistema nos sinais necessários para os ramos. Nos testes feitos, foi possível verificar que o desempenho do PA, em termos de potência e eficiência, não varia substancialmente, mesmo quando a ordem do polinómio é baixa. No entanto, esta redução da ordem do polinómio pode comprometer a linearidade do amplificador. Quando testado com um sinal LTE com 10.33 dB de PAPR ou com um sinal GSM de 4 portadoras com 6.2 dB, ambos com 10 MHz de largura de banda, o amplificador demonstra níveis de distorção consideráveis. Isso é demonstrado nas três métricas de desempenho avaliadas: AM-AM; AM- PM; e ACLR. Os níveis de eficiência média atingem os 50 % para o sinal GSM e 36% para o sinal LTE. Após a utilização de pré-distorção, o amplificador melhorou as métricas avaliadas. Este cenário foi testado para o sinal LTE e utilizando um polinómio de 7a ordem no separador de sinais. O ACLR baixou de -21 dBc para -56 dBc; a variação AM-AM de 2.3 dB para 0.6 dB; e a variação AM-PM de 61.0o para 3.2o. Isto enquanto o rendimento médio aumentou de 30 % para 36 %. No final, os objectivos do trabalho foram concluídos, pelo que o protótipo produzido se equipara a alguns trabalhos de referência na literatura.
Mestrado em Engenharia Eletrónica e Telecomunicações
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