This thesis details the development and implementation of an attitude and orbit determining Kalman filter algorithm for a satellite in a Molniya orbit. To apply the Kalman Filter for orbit determination, the equations of motion of the two body problem were propagated using Cowell's formulation. Four types of perturbing forces were added to the propagated model in order to increase the accuracy of the orbit prediction. These four perturbing forces are Earth oblateness, atmospheric drag, lunar gravitational forces and solar radiation pressure. Two cases were studied, the first being the implementation of site track measurements when the satellite was over the ground station. It is shown that large errors, upwards of ninety meters, grow as time from last measurement input increases. The next case studied was continuous measurement inputs from a GPS receiver on board the satellite throughout the orbit. This algorithm greatly decreased the errors seen in the orbit determining algorithm due to the accuracy of the sensor as well as the continuous measurement inputs throughout the orbit. It is shown that the accuracy of the orbit determining Kalman filter also depends on the length of time between each measurement update. The errors decrease as the time between measurement updates decreases. Next the Kalman filter is applied to determine the satellite attitude. The rotational equations of motion are propagated using Cowell's Formulation and numerical integration. To increase the fidelity of the model four disturbing torques are included in the rotational equations of motion model: gravity gradient torque, solar pressure torque, magnetic torque, and aerodynamic torque. Four cases were tested corresponding to four different on board attitude determining sensors: magnetometer, Earth sensor, sun sensor, and star tracker. A controlled altitude path was chosen to test the accuracy of each of these cases and it was shown that the algorithm using star tracker measurements was three hundred times more accurate than that of the magnetometer algorithm. / Master of Science

In a society fixated on leaders, where does that leave followers? Followership highlights the follower in the leadership process, examines who are followers, and explores how and why people follow. Much of the existing literature on followership has focused on classifying followers into follower types. However, less is known about why an employee might enact a particular follower role. The purpose of this dissertation is to understand how leaders influence the likelihood that followers to enact a particular follower role orientation, either coproducing or passive. Specifically, this research contributes to understanding the impact of transformational leadership on follower motivation and follower role orientation. An additional contribution of this dissertation is to establish the theoretical mechanism that explains the connection between leader behavior and follower role orientation by integrating self-determination theory (SDT) into the process of followership. Through SDT, we gain understanding of the origins of these roles by explaining their underlying motivation. Study 1 consisted of sequential experiments with a between-subject design that used distinct vignettes for transformational leadership and work-based need satisfaction. Findings support the causal relationship between transformational leadership and follower needs satisfaction; however, the casual relationship between follower need satisfaction and follower role orientation was not significant. Study 2 was a two-wave field study of full-time employed adults located in the United States. Results from Study 2 indicated that transformational leadership relates to coproduction follower orientation through competence need satisfaction and to passive follower orientation through autonomy/relatedness needs satisfaction. These findings contribute to our understanding of how different follower role orientations develop.

Ledarskapet anses ha stor påverkan på individers motivation inom sin idrott. Ledarskap kan, inom ramarna för Self-Determination Theory (SDT), i stort sorteras i två olika stilar, autonomistödjande respektive kontrollerande ledarskap. I dagsläget finns en brist på experimentella studier som jämför dessa två ledarskapsstilars påverkan på motivation. Denna studie syftade till att i en isolerad miljö undersöka hur ett autonomistödjande respektive ett kontrollerande ledarskap har en påverkan på inre motivation och prestation. I studien ingick 37 deltagare som under 20 minuter fick utföra en bygguppgift med lego under en neutral, autonomistödjande eller kontrollerande ledarskapsstil. Resultatet visade att den kontrollerande ledarskapsstilen hade en viss negativ påverkan på motivation och att gruppen kontroll angav en lägre upplevd kompetens än gruppen autonomi.  Ingen av ledarskapsstilarna hade någon effekt på prestation. Vidare visade sig upplevd motivation ha ett signifikant samband med prestation på bygguppgiften. / Within sports, leadership is considered having a great impact on individuals’ motivation. Leadership could, within a Self-Determination Theory (SDT) framework, be sorted into two different styles, autonomous and controlling leadership. There is a gap in current research concerning the effects of autonomous and controlling leadership on motivation in experimental settings. The aim of the present study was to, in an isolated environment, examine how an autonomy supportive- or a controlling leadership affects intrinsic motivation and performance. The study included 37 participants who, over a period of 20 minutes, performed a lego building task under a neutral, an autonomy supportive- or a controlling leadership style condition. The results indicated that the controlling leadership style had a negative impact on motivation and that the controlled group had lower perceived competence compared to the autonomous group. None of the leadership styles affected performance. Further, perceived motivation was found to significantly correlate with task.

This report investigates the effects a demand based tariff would have on private electricity consumers and how it could contribute to a sustainable electrical grid. The fuse tariff that is currently used charges customers for their electricity usage and does not fully reflect the electrical grid load and thereby not the cost for the distribution system operators. A demand based tariff, that charges customers for their power peaks and promotes a change of behaviour better reflects the grid load and could lead to a more even grid distribution and a sustainable development. In light of this issue, two demand based tariffs have been constructed for the energy company Upplands Energi’s private customers’ current electricity consumption. One of the tariffs consists of a higher fixed cost and a lower variable cost and the other consists of a lower fixed cost and a higher variable cost, both leading to the same revenue för Upplands Energi. The two different demand based tariffs have been simulated and analysed, where the one with the lowest fixed cost is recommended since it gives customers higher economic incentives to change their electricity usage behaviour. It is essential that electricity retailers communicate the information of how the demand based tariff works to the customers in order to make them change their electricity behaviour to attain a sustainable grid.

Studien har genomförts med syfte att undersöka hur friskvårdstimmen upplevs ur arbetstagarens perspektiv. Studien gjordes inom olika yrkesområden inom både privat och offentliga sektorn. I dagens arbetsliv är vi i högre grad stillasittande än tidigare och därför har behovet av fysisk aktivitet ökat. I studien ställer vi oss frågande till i vilken utsträckning friskvårdstimman nyttjas, vilka motivationsfaktorer som påverkar nyttjandet samt vilka effekter arbetstagaren upplever av friskvårdstimmen. Vi har en gjort en kvalitativ studie med semistrukturerade intervjuer genom att intervjua sju respondenter. Resultatet från studien visar att de respondenter som nyttjar friskvårdstimmen regelbundet är de som har möjlighet att självständigt planera sin dag. De respondenter som inte har samma möjlighet att självständigt planera sin arbetsdag uppger att schemalagd friskvårdstimme skulle öka nyttjandet. Arbetsgivarens inställning visade sig vara en betydande faktor för nyttjandet. Att schemalägga friskvårdstimmen skulle uppfattas som en uppmuntran från arbetsgivaren vilket skulle underlätta för de respondenter som inte har möjlighet att styra sin arbetsdag. Resultatet visar också på att nyttjandet av friskvårdstimmen ökar respondenternas arbetsmotivation. Resultatet har diskuterats utifrån Self-determination-theory av Richard Ryan och Edward Deci, Frederick Herzbergs tvåfaktorteori samt tidigare forskning.

Federal policies and laws as well as research in the area of self-determination have encouraged meaningful student involvement in the IEP process for over twenty years. Active student involvement in the IEP process allows for students to practice important self-determination skills in an applied setting and to be meaningful participants in their education. The purpose of this literature review is to establish what constitutes meaningful student involvement in the IEP process and identify evidence-based practices for increasing meaningful student involvement. / text

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