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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.
1

Dominanta och undergivna karaktärer : En studie i om en karaktärs egenskaper tolkas olika beroende på vilket kön det representerar

Helmisaari, Minnamari January 2013 (has links)
Denna studie behandlar sättet som karaktärer gestaltas i bilder för spel och undersöker om mottagarens förhållningssätt till karaktären skiljer sig beroende på karaktärens kön. Det som undersöks är ifall karaktärerna tolkas olika även om de är menade att representera samma egenskap, samt ifall tolkningen av karaktärerna förändras när dessa samspelar med en annan karaktär i samma bild. För att undersöka detta skapades bilder av manliga och kvinnliga karaktärer samt en karaktär vars kön inte gick att urskilja. Alla karaktärer gestaltades med tre olika varianter på representation: dominans, undergivenhet och likgiltighet. Utöver dessa bilder skapades även fyra olika varianter av reklambilder för att undersöka ifall tolkningen av karaktärerna påverkas av att dessa samspelar med en annan karaktär i samma bild. Undersökningen utfördes genom en webbenkät med slutna och öppna frågor om vad den svarande ansåg att karaktärerna representerade.
2

Coordinated Control of HVDC Links in Transmission Systems

Eriksson, Robert January 2011 (has links)
Dynamic security limits the power transfer capacity between regions and therefore has an economic impact. The power modulation control of high-voltage direct current (HVDC) links can improve the dynamic security of the power system. Having several HVDC links in a system creates the opportunity to coordinate such control, and coordination also ensures that negative interactions do not occur among the controllable devices. This thesis aims to increase dynamic security by coordinating HVDC links, as an alternative to decreasing the transfer capacity. This thesis contributes four control approaches for increasing the dynamic stability, based on feedforward control, adaptive control, optimal control, and exact-feedback linearization control. Depending on the available measurements, dynamic system model, and system topology, one of the developed methods can be applied. The wide-area measurement system provides the central controller with real-time data and sends control signals to the HVDC links. The feedforward controller applies rapid power dispatch, and the strategy used here is to link the N-1 criterion between two systems. The adaptive controller uses the modal analysis approach; based on forecasted load paths, the controller gains are adaptively adjusted to maximize the damping in the system. The optimal controller is designed based on an estimated reduced-order model; system identification develops the model based on the system response. The exact-feedback linearization approach uses a pre-feedback loop to cancel the nonlinearities; a stabilizing controller is designed for the remaining linear system. The conclusion is that coordinating the HVDC links improves the dynamic stability, which makes it possible to increase the transfer capacity. This conclusion is also supported by simulations of each control approach. / QC 20110302

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