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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.
111

Mitteilungen des URZ 4/2007

Clauß, Matthias, Müller, Thomas, Riedel, Wolfgang, Ziegler, Christoph, Schmidt, Ronald, Fischer, Günther, Dippmann, Dagmar 03 December 2007 (has links)
Informationen des Universitätsrechenzentrums:Speicherdienste Unterstützung der Systemplattformen Windows XP, Windows Vista und Scientific Linux Dienstangebot: VIRTUELLES SERVER HOSTING (VSH) Campuslizenzverträge Software-Bedarf in den Pools, Sommersemester 2008 Update Datenbankserver Neue VoIP-Features Kurzinformationen: Umstellung Wiki-Server, XWIN-Upgrade auf 5 Gbps Software-News: Neue Software-Handbücher, Neue Softwareprodukte
112

Explorative Suchstrategien am Beispiel von flickr. com

Wenke, Birgit, Lechner, Ulrike January 2009 (has links)
No description available.
113

Uncertainty and correlation modeling for load flow analysis of future electricity distribution systems : Probabilistic modeling of low voltage networks with residential photovoltaic generation and electric vehicle charging

Ramadhani, Umar Hanif January 2021 (has links)
The penetration of photovoltaic (PV) and electric vehicles (EVs) continues to grow and is predicted to claim a vital share of the future energy mix. It poses new challenges in the built environment, as both PV systems and EVs are widely dispersed in the electricity distribution system. One of the vital tools for analyzing these challenges is load flow analysis, which provides insights on power system performance. Traditionally, for simplicity, load flow analysis utilizes deterministic approaches and neglecting  correlation between units in the system. However, the growth of distributed PV systems and EVs increases the uncertainties and correlations in the power system and, hence, probabilistic methods are more appropriate. This thesis contributes to the knowledge of how uncertainty and correlation models can improve the quality of load flow analysis for electricity distribution systems with large numbers of residential PV systems and EVs. The thesis starts with an introduction to probabilistic load flow analysis of future electricity distribution systems. Uncertainties and correlation models are explained, as well as two energy management system strategies: EV smart charging and PV curtailment. The probabilistic impact of these energy management systems in the electricity distribution system has been assessed through a comparison of allocation methods and correlation analysis of the two technologies. The results indicate that these energy management system schemes improve the electricity distribution system performance. Furthermore, an increase in correlations between nodes is also observed due to these schemes. The results also indicate that the concentrated allocation has more severe impacts, in particular at lower penetration levels. Combined PV-EV hosting capacity assessment shows that a combination of EV smart charging with PV curtailment in all buildings can further improve the voltage profile and increase the hosting capacity.  The smart charging scheme also increased the PV hosting capacity slightly. The slight correlation between PV and EV hosting capacity shows that combined hosting capacity analysis of PV systems and EVs is beneficial and is suggested to be done in one framework. Overall, this thesis concludes that an improvement of uncertainty and correlation modeling is vital in probabilistic load flow analysis of future electricity distribution systems.
114

Decentralized Web Hosting : A comparative analysis of decentralized- and centralized web hosting

Olofsson, Joel, Rubensson, Oskar January 2022 (has links)
Publisering av webbplatser sker traditionellt i ett centraliserat nätverk där en webbserver distribuerar webbplatsens filer till sina klienter. Detta gör det möjligt för större företag eller regeringar att välja vilket innehåll som ska visas och tar bort den frihet som World Wide Web ursprungligen medförde. Att använda ett decentraliserat nätverk som värd för webbplatser kan dock vara fördelaktigt i vissa situationer på grund av de decentraliserade nätverkens höga skalbarhet och skydd mot censur. Denna studie syftar till att fastställa hur en webbplats kan publiceras i ett decentraliserat nätverk och om det kan vara att föredra för vissa typer av webbplatser. Studien syftar också till att ta reda på om det finns några säkerhetsbrister i de decentraliserade nätverken. Detta gjordes genom en litteraturstudie och genom att skapa ett test-system som kan stresstesta en webbplats som ligger på en vanlig webbserver och de decentraliserade lösningarna IPFS och Hypercore. Studien har visat att decentraliserade nätverk i allmänhet distribuerar en webbplats till många klienter snabbare i de flesta situationer. Vidare visas också att det finns några problem för en decentraliserad webbplats som inte finns i en webbplats som ligger på en vanlig webbserver. Bland dessa problem finns det vissa etiska diskussioner att ta hänsyn till när det gäller behandling av personuppgifter, oönskad spridning av olagligt innehåll och möjligheten att radera publicerat innehåll. I studien drogs slutsatsen att om en viss webbplats och dess ägare kan överblicka nackdelarna med ett decentraliserat nätverk bör det med största sannolikhet föredras framför en traditionell webbserver. / Hosting websites is traditionally done in a centralized network where a web server distributes the website’s files to it’s clients. This enables larger companies or governments to choose what content is shown and remove the freedom that the world wide web initially brought. However, using a decentralized network to host websites might be favorable in some situations due to the decentralized networks’ high scalability and protection against censorship. This study aims to determine how a website can be published in a decentralized network and if it can be preferred for some types of websites. The study also aims to find out if there exist any security vulnerabilities in the decentralized networks. This was done by a literature study and by creating a benchmarking system that can stress-test a website hosted on a traditional web server and the decentralized solutions IPFS and Hypercore. The study has shown that decentralized networks generally distribute a website to many clients faster in most situations. Further, it is also shown that there exists a few problems for a decentralized website that is not present in a website hosted on a traditional web server. Among these problems, there are some ethical discussions to be considered regarding the processing of personal data, unwanted distribution of illegal content, and the possibility of deleting published content. The study concluded that if a given website and its owner can oversee the disadvantages of a decentralized network, it should most likely be preferred over a traditional web server
115

Increasing the hosting capacity of distributed energy resources using storage and communication / Öka acceptansgränsen för förnyelsebaraenergikällor med hjälp av lagring och kommunikation i smarta elnät

Etherden, Nicholas January 2012 (has links)
The use of electricity from Distributed Energy Resources like wind and solar powerwill impact the performance of the electricity network and this sets a limit to theamount of such renewables that can be connected. Investment in energy storage andcommunication technologies enables more renewables by operating the networkcloser to its limits. Electricity networks using such novel techniques are referred toas “Smart Grids”. Under favourable conditions the use of these techniques is analternative to traditional network planning like replacement of transformers orconstruction of new power line.The Hosting Capacity is an objective metric to determine the limit of an electricitynetwork to integrate new consumption or production. The goal is to create greatercomparability and transparency, thereby improving the factual base of discussionsbetween network operators and owners of Distributed Energy Resources on thequantity and type of generation that can be connected to a network. This thesisextends the Hosting Capacity method to the application of storage and curtailmentand develops additional metrics such as the Hosting Capacity Coefficient.The research shows how the different intermittency of renewables and consumptionaffect the Hosting Capacity. Several case studies using real production andconsumption measurements are presented. Focus is on how the permitted amountof renewables can be extended by means of storage, curtailment and advanceddistributed protection and control schemes. / Användningen av el från förnyelsebara energikällor som vind och sol kommer att påverka elnätet, som sätter en gräns för hur mycket distribuerad energiproduktion som kan anslutas. Investeringar i storskalig energilager och användning av modern kommunikationsteknologi gör det möjligt att öka andelen förnyelsebarenergi genom att nätet kan drivas närmare sina gränser. Elnät med sådana nya tekniker kallas ofta för ”Smarta Elnät". Implementering av sådana smarta elnät kan vara ett alternativ till traditionell nätplanering och åtgärder som utbyte av transformatorer eller konstruktion av nya kraftledningen.Nätets acceptansgräns är ett objektivt mått för att bestämma gränsen för nätets förmåga att integrera ny förbrukning eller produktion. Målet är att skapa större transparens och bidra till ett bättre faktaunderlag i diskussioner mellan nätoperatörer och ägare av distribuerade energiresurser. Denna avhandling utökar acceptansgränsmetoden för tillämpning med energilager och produktions nedstyrning och utvecklar ytterligare begrepp så som acceptansgränsen koefficienten.Forskningen visar hur varierbarheten hos olika förnyelsebara energikällor samverkar med förbrukningen och påverkar nätets acceptansgräns. Flera fallstudier från verkliga elnät och med uppmätt produktion och konsumtion presenteras. Fokus är på hur den tillåtna mängden förnyelsebara energikällor kan ökas med hjälp av energilagring, kontrollerad produktionsnedstyrning och med avancerad distribuerade skydd och kontroll applikationer. / Nicholas Etherden works at STRI AB (www.stri.se) in Gothenburg, Sweden. When he is not pursuing his half-time PhD studies he works as a specialist consultant in the field of Power Utility Automation, specialising on the IEC 61850 standard for power utility automation (today widely used in substations as well as some wind parks, hydro plants and DER and Smart Grid applications such as vehicle-to-grid integration). The author of this thesis received his Master of Science in Engineering Physics from Uppsala University 2000. Side tracks during his engineering studies included studies in theoretical philosophy, chemistry, ecology and environmental sciences as well as chairing the Swedish student committee of the Pugwash Conferences on Science and Worlds Affairs and later board member of the International Network of Engineers and of Scientists for Global Responsibility (INES) and chair of Swedish Scientists and Engineers Against Nuclear Arms. He has been a trainee at ABB in Västerås Sweden and spent six years as developer and team leader for the application development of a new relay protection family (ABB IED 670 series). In parallel to his professional work he studied power system engineering at Mälardalens University and travelled to all continents of the world. Since 2008 he is responsible for the STRI IEC 61850 Independent Interoperability Laboratory and a member of IEC Technical Committee 57 working group 10 "Power system communication and associated data models” and UCA/IEC 61850 User group testing subcommittee. He is co-author of IEC 61850-1 and main contributor to “Technical Report on Functional Test of IEC 61850 systems” and has held over 25 hands-on courses around the world on IEC 61850 “Communication networks and systems for power utility automation”. / SmartGrid Energilager
116

L'encadrement juridique de la gestion électronique des données médicales. / Legal framework for the electronic management of medical data

Etien-Gnoan, N'Da Brigitte 18 December 2014 (has links)
La gestion électronique des données médicales consiste autant dans le simple traitement automatisé des données personnelles que dans le partage et l'échange de données relatives à la santé. Son encadrement juridique est assuré, à la fois, par les règles communes au traitement automatisé de toutes les données personnelles et par celles spécifiques au traitement des données médicales. Cette gestion, même si elle constitue une source d'économie, engendre des problèmes de protection de la vie privée auxquels le gouvernement français tente de faire face en créant l'un des meilleurs cadres juridiques au monde, en la matière. Mais, de grands chantiers comme celui du dossier médical personnel attendent toujours d'être réalisés et le droit de la santé se voit devancer et entraîner par les progrès technologiques. Le développement de la télésanté bouleverse les relations au sein du colloque singulier entre le soignant et le soigné. L'extension des droits des patients, le partage de responsabilité, l'augmentation du nombre d'intervenants, le secret médical partagé constituent de nouveaux enjeux avec lesquels il faut, désormais compter. Une autre question cruciale est celle posée par le manque d'harmonisation des législations augmentant les risques en cas de partage transfrontalier de données médicales / The electronic management of medical data is as much in the simple automated processing of personal data in the sharing and exchange of health data . Its legal framework is provided both by the common rules to the automated processing of all personal data and those specific to the processing of medical data . This management , even if it is a source of economy, creates protection issues of privacy which the French government tries to cope by creating one of the best legal framework in the world in this field. However , major projects such as the personal health record still waiting to be made and the right to health is seen ahead and lead by technological advances . The development of e-health disrupts relationships within one dialogue between the caregiver and the patient . The extension of the rights of patients , sharing responsibility , increasing the number of players , the shared medical confidentiality pose new challenges with which we must now count. Another crucial question is posed by the lack of harmonization of legislation increasing the risks in cross-border sharing of medical
117

Increasing the hosting capacity of distributed energy resources using storage and communication / Öka acceptansgränsen för förnyelsebaraenergikällor med hjälp av lagring och kommunikation i smarta elnät

Etherden, Nicholas January 2014 (has links)
This thesis develops methods to increase the amount of renewable energy sources that can be integrated into a power grid. The assessed methods include i) dynamic real-time assessment to enable the grid to be operated closer to its design limits; ii) energy storage and iii) coordinated control of distributed production units. Power grids using such novel techniques are referred to as “Smart Grids”. Under favourable conditions the use of these techniques is an alternative to traditional grid planning like replacement of transformers or construction of a new power line. Distributed Energy Resources like wind and solar power will impact the performance of the grid and this sets a limit to the amount of such renewables that can be integrated. The work develops the hosting capacity concept as an objective metric to quantify the ability of a power grid to integrate new production. Several case studies are presented using actual hourly production and consumption data. It is shown how the different variability of renewables and consumption affect the hosting capacity. The hosting capacity method is extended to the application of storage and curtailment. The goal is to create greater comparability and transparency, thereby improving the factual base of discussions between grid operators, electricity producers and other stakeholders on the amount and type of production that can be connected to a grid.Energy storage allows the consumption and production of electricity to be decoupled. This in turn allows electricity to be produced as the wind blows and the sun shines while consumed when required. Yet storage is expensive and the research defines when storage offers unique benefits not possible to achieve by other means. Focus is on comparison of storage to conventional and novel methods.As the number of distributed energy resources increase, their electronic converters need to provide services that help to keep the grid operating within its design criteria. The use of functionality from IEC Smart Grid standards, mainly IEC 61850, to coordinate the control and operation of these resources is demonstrated in a Research, Development and Demonstration site. The site contains wind, solar power, and battery storage together with the communication and control equipment expected in the future grids.Together storage, new communication schemes and grid control strategies allow for increased amounts of renewables into existing power grids, without unacceptable effects on users and grid performance. / Avhandlingen studerar hur existerande elnät kan ta emot mer produktion från förnyelsebara energikällor som vindkraft och solenergi. En metodik utvecklas för att objektivt kvantifiera mängden ny produktion som kan tas emot av ett nät. I flera fallstudier på verkliga nät utvärderas potentiella vinster med energilager, realtids gränser för nätets överföringsförmåga, och koordinerad kontroll av småskaliga energiresurser. De föreslagna lösningarna för lagring och kommunikation har verifierats experimentellt i en forskning, utveckling och demonstrationsanläggning i Ludvika. / Godkänd; 2014; Bibliografisk uppgift: Nicholas Etherden är industridoktorand på STRI AB i Göteborg. Vid sidan av doktoreringen har Nicholas varit aktiv som konsult inom kraftsystemsautomation och Smarta Elnät. Hans specialitet är IEC 61850 standarden för kommunikation inom elnät, vindkraftparker och distribuerad generering. Författaren har en civilingenjörsexamen i Teknisk fysik från Uppsala Universitet år 2000. Under studietiden läste han även kurser i kemi, miljökunskap och teoretisk filosofi. Han var under studietiden ordförande för Student Pugwash Sweden och ledamot International Network of Engineers and of Scientists for Global Responsibility (INES). Efter studietiden var han ordförande i Svenska Forskare och Ingenjörer mot Kärnvapen (FIMK). Han började sin professionella bana som trainee på ABB i Västerås där han spenderade sex år som utvecklare och grupp ledare för applikationsutvecklingen i ABB reläskydd. I parallell till arbete har han läst elkraft vid Mälardalenshögskola. År 2008 började han på STRI AB som ansvarig för dess IEC 61850 interoperabilitetslab. Han är på uppdrag av Svenska Kraftnät aktiv i ENTSO-E IEC 61850 specificeringsarbete och svensk representant i IEC tekniska kommitté 57, arbetsgrupp 10 som förvaltar IEC 61850 standarden. Han har hållit över 30 kurser i IEC 61850 standarden i fler än 10 länder.; 20140218 (niceth); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Nicholas Etherden Ämne: Elkraftteknik/Electric Power Engineering Avhandling: Increasing the Hosting Capacity of Distributed Energy Resources Using Storage and Communication Opponent: Professor Joao A Peças Lopes, Faculty of Engineering of the University of Porto, Portugal Ordförande: Professor Math Bollen, Avd för energivetenskap, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Måndag den 24 mars 2014, kl 09.00 Plats: Hörsal A, Campus Skellefteå, Luleå tekniska universitet / SmartGrid Energilager
118

Mitteilungen des URZ 1/2009

Riedel, Wolfgang 25 March 2009 (has links)
Informationen des Universitätsrechenzentrums mit Jahresrückblick 2008 zu den aktuellen Projekten und Diensten des URZ
119

Mitteilungen des URZ 1/2010

Riedel, Wolfgang, Schier, Thomas 01 March 2010 (has links)
Informationen des Universitätsrechenzentrums mit Jahresrückblick 2009 zu den aktuellen Projekten und Diensten des URZ
120

Mitteilungen des URZ 1/2009

Riedel, Wolfgang 25 March 2009 (has links)
Informationen des Universitätsrechenzentrums mit Jahresrückblick 2008 zu den aktuellen Projekten und Diensten des URZ:Jahresrückblick 2008 Softwareausstattung der Ausbildungspools Kurzinformationen Software-News

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