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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

Efficient, Flexible, and Resilient Control for Optimal Operation of Hybrid-Electric Shipboard Microgrids

Sitch, Kaitlyn, 0009-0002-1646-3774 January 2023 (has links)
Electric transportation has been a well-studied research topic with electric ships gaining momentum. Ships can have a wide range in size from small cargo ships to military vessels. The benefits of electrification include meeting environmental sustainability goals and operational benefits in terms of flexibility and renewed operation. The power systems onboard a ship can be considered a microgrid, which is called a shipboard microgrid. This system poses unique challenges compared to land-based microgrids due to the resiliency requirements of being at sea. A control system for a hybrid- electric ship is proposed with both an energy storage system (ESS) and traditional diesel generators and gas turbines. This system balances economics with resilient control by calculating a baseline load distribution using the cost of operating each unit for the expected load profile. Additionally, the control system ensures that the generation capacity is available if the load does not follow the expected profile. To maintain flexibility, the system will redispatch the units as needed based on the actual load applied, while reducing the control efforts and maintaining the generation contingency. Therefore, the proposed shipboard microgrid control offers a control method that considers the cost of operation while maintaining the required standards of shipboard microgrid control. / Electrical and Computer Engineering
2

Ekonomisk styrning i banksektorn : En jämförelse av två storbanker i Sverige med fokus på flexibla styrmedel.

Karlevid, Christine, Sandell, David January 2010 (has links)
A more complex and turbulent world market puts pressure on flexibility and the ability to adjust its business to the market changes. The rapid and unpredictable change is hade to analyze and forecast which demands more short-term forecasting. The issue for this dissertation is based upon the demand of more flexible ways of doing business in the bank sector in Sweden, which is a turbulent and unpredictable market. Handelsbanken is a company that uses the so called Beyond budgeting concept and the dissertation is about this company’s ability to solve the economic governance without the traditional budgeting process. The purpose of the study is to compare this organisation with another bank, Swedbank, who also operates on the Swedish market. The study aims to point at differences and similarities between the bank with the Beyond budgeting concept and the other who still is holding on to the traditional budgeting process. Important concepts within the study are; rolling forecasts, KPI and benchmarking. The data was gathered through telephone interviews and secondary data. The authors have been in contact with one regional control in each of the banks to get an understanding about the economic governance in the banks. The findings are that both of the banks are widely decentralised even though Swedbank still holds on to the fact that the traditional budgeting process is important for the company. Both of the companies are using a similar company structure, where local decision power is emphasised and the internal competition is crucial to be able to create motivated employees to be competitive on the market. The banks are also both very interested in not just the financial results but the non-financial, such as customers. / I en allt mer komplicerad och turbulent värld, ställs nya krav på företags flexibilitet och förmåga att ändra sig efter marknaden. Eftersom marknaden ändrar sig väldigt snabbt och ofta, är det svårt att förutse vad som kommer hända i framtiden, och därför behövs mer kortsiktiga framtidsprognoser. Uppsatsens problemformulering grundar sig i kravet på allt mer flexibla styrinstrument i denna globaliserade värld. Handelsbanken är ett företag som använder sig av så kallad budgetlös styrning och uppsatsens problematisering berör bankens sätt att lösa den ekonomiska styrningen med avsaknad av budget. Syftet med studien är att jämföra Handelsbankens ekonomistyrning med Swedbanks, en bank som fortfarande använder sig av traditionell budgetering. I studien beskrivs skillnaderna mellan en bank som har budgetlös styrning och en som är mer budgetstyrd, vad som behövs för att skapa en fungerande budgetlös styrning och vilka fördelar respektive nackdelar det finns med dessa styrningar. Viktiga begrepp inom budgetlös styrning är rullande prognoser, nyckeltal och benchmarking. Insamling av data har skett genom telefonintervjuer och insamling av sekundär data. Man har vart i kontakt med en controller på regionnivå i respektive bank för att få en förståelse för hur det ekonomiska arbetet fungerar i bankerna. Vad som är framgår i studien är att båda företagen är decentraliserade men Swedbank använder en traditionell budget för hela företag dock främst fokuserad till kostnadssidan. Båda företagen har liknande struktur, med en decentraliserad organisation och där de lokala kontoren har stor beslutskraft dessutom använder båda bankerna intern konkurrens för att motivera sina anställda och för att kunna övervaka resultatet. De förlitar sig inte bara på finansiella resultat utan de icke-finansiella resultaten har en väldigt viktigt roll i båda företagen.
3

Psychological and Cognitive Factors that Influence Post-Exercise Energy Intake in Normal Weight and Overweight Sedentary Males

Harris, Cristen Lynn 26 March 2008 (has links)
The primary purpose of this study was to evaluate the effects of a single bout of moderate-intensity exercise on acute (ad libitum lunch) post-exercise energy intake (PE-EI) and 12-hour energy intake in normal-weight and overweight sedentary males. Accuracy in estimating energy intake (EI) and energy expenditure (EE), solid vs. liquid carbohydrate intake, mood, and perceived hunger were also assessed. The study consisted of two conditions, exercise and rest, with each subject participating in each condition, in a counterbalanced-crossover design on two days. The participants were randomly assigned to either the exercise or resting (seated) control condition on the first day of the experiment, and then the condition was reversed on the second day. Exercise consisted of walking on a treadmill at moderate-intensity for 60 minutes. Eighty males, mean age 30+8 years were categorized into five groups according to weight status (overweight/normal-weight), dietary restraint status (high/low), and dieting status (yes/no). The main effects of condition and group, and the interaction were not significant for acute (lunch) or 12-hour PE-EI. Overall, participants estimated EE for exercise at 46% higher than actual exercise EE, and they estimated EE for rest by 45% lower than actual resting EE. Participants significantly underestimated EI at lunch on both the exercise and rest days by 43% and 44%, respectively. Participants with high restraint were significantly better at estimating EE on the exercise day, and better at estimating EI on the rest day. Mood, perceived hunger, and solid vs. liquid carbohydrate intake were not influenced by dietary restraint, weight, or dieting status. In conclusion, a single bout of moderate-intensity exercise did not influence PE-EI in sedentary males in reference to dietary restraint, weight, and dieting status. Results also suggested that among sedentary males, there is a general inability to accurately estimate calories for moderate-intensity physical activity and EI. Inaccurate estimates of EE and EI have the potential to influence how males manage their weight.

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