It is specifically important to focus on voltage stability analysis of the power system to avoid worst case scenarios such as voltage collapse. The purpose of this thesis is to identify methods for enhancing the steady-state voltage stability using FACTS devices and determining their impact on real and reactive power losses, improvement of bus voltage magnitude, and transmission line loadability. To achieve this, FACTS devices such as Static VAR Compensator (SVC), Static Synchronous Compensator (STATCOM), and Thyristor Controlled Series Capacitor (TCSC) are used in the test system as three separate test cases. The results obtained assist in drawing conclusions on the effectiveness of each FACTS devices at generator, load and swing buses, on lines between two load buses, and between a load bus and a generator bus, in terms of metrics such as voltage magnitude profile, PV curves, and active and reactive power losses.

Denna studie undersöker hur arbetslagsledarrollen är utformad genom intervjuer och uppdragsbeskrivningar på de kommunala gymnasieskolorna i en svensk storstadskommun. Studien utgår från ett socialkonstruktionistiskt perspektiv och kritisk teori genom Foucault, i form av maktanalys. Maktanalysen bidrar till att belysa samtida praktiker och tekniker ur ett historiskt perspektiv utifrån frågeställningar som på olika sätt berör maktens bas och logiker. Arbetslagsledarens roll framstår i uppdragsbeskrivningar som mångfacetterad, omfattande och splittrad med diverse administrativa uppgifter samt ansvar för utvecklingsprocesser och utvärdering. Formuleringar om att utveckling ska initieras av arbetslagsledaren och beslut från skolledning också implementeras förekommer, vilka kan härledas till olika teoribildningar. Arbetslagsledare själva beskriver ett komplext uppdrag där en stor del av tiden läggs på uppgifter som är mindre framträdande eller inte alls framgår i uppdragsbeskrivningarna. En betoning ligger på att agera budbärare, eftersöka information och sköta administrativa åtaganden. Sammanfattningsvis tycks en helhet saknas i uppdragen och praktiken skilja sig från utformningen i uppdragsbeskrivningarna. Arbetslagsledaren framstår som en länk mellan skolledning, elevhälsa och lärare där de bidrar till kontinuitet och stabilitet i en skola där omsättning på rektorer tycks mer frekvent. En ny komplex organisation med flera olika delegerade ledningsuppdrag och funktioner ställer höga krav på samordning. Framtida studier kan med fördel belysa hur samverkan och samarbete mellan distribuerade ledningsfunktioner kan fungera i en komplex organisation, där förutsättningar ständigt förändras. / This study explores the formation of the teacher team leaders´ role, using interviews and job descriptions at comprehensive upper secondary schools in a Swedish metropolitan municipality. The theoretical framework includes a social constructionist and critical perspective, through Foucault, based on analysis of power. Analysis of power illuminates contemporary practices and techniques through a historical lens, using questions that are related to the basis and logics of power. The job descriptions proclaim a diverse, extensive and somewhat scattered mission consisting of administrative duties as well as managing development and evaluation of processes. According to the job description, the teacher team leader is responsible for initiating learning processes as well as implementing decisions by principals, each advocating a different theory. Teacher team leaders describe a complex mission where a substantial amount of time is spent on tasks less prevalent or unmentioned in the job description. Acting as a messenger, yet a constant search for information and administrative duties are tasks that teacher team leaders emphasize. In conclusion, it appears as if a comprehensive view of the mission at hand is deficient and that actual practice appears relatively different from the job description. The teacher team leaders operate as a link between school leaders, the Student Health Team and teachers where they contribute to continuity and stability in a school where school leaders more frequently are exchanged. A new and complex organization involving several distributed leadership roles requires thorough work in terms of co-ordination. Future studies may address how interplay and collaboration can work in a complex organization, where preconditions are continuously altered.

In recent years, ¡§Boost the economy and cut down the unemployment rate¡¨ has become a common understanding of the people in Taiwan, which is the government¡¦s goal for economic development as well. One of the most effective strategies to boost the economy is to encourage investment. However, the rising concern of environmental protection and the consciousness of living peacefully with the mother natural have become a trend nowadays. Furthermore, not only business but also the government and the neighboring residents have increased their standards for environmental protection. Therefore, the industry has tended to be more prudent to any new development project. What deserves to be mentioned is, no matter how wonderful a proposed project is, without the support of local residents, no project can be executed. Therefore, we should regard the citizen participation and environmental impact assessment (EIA). China Petroleum Corporation (CPC) proposed at the end of 2002, aiming to make the transformation from an oil plant to a hi-tech petrochemical zone on Kaohsiung Oil Refinery, with new petrochemical equipment and nono-technology. Ministry of Economic Affairs has agreed with the proposed transformation with the condition that CPC has to obtain approval from the local residents, representatives and government. According to the analysis of power interaction, this study intends to provide related policy suggestions to the government and CPC with the purpose of economic prosperity. For the evolution of modern society, sustainable development and business continuity will play important roles. Besides adopting opinion poll, Delphi Technique is also applied as the research methodology to carry on experts¡¦ interviews and questionnaires investigation.

This thesis examines the discursive construction of Russian national identity through the 2008 war in Georgia with a focus on how this process was influenced by the Russian leadership’s desire to gain the support of both the domestic and international audiences for its actions outside its borders. These actions involved forceful military intervention, the recognition of the independence of the two Georgian break-away republics of South Ossetia and Abkhazia and the decision to place Russian military troops in the two republics during the aftermath of war. The study critically examines the official Russian discourse, with a focus on particular visions of national identity that this discourse utilized. The study demonstrates how the official discourse in the context of the 2008 war contributed to the construction of Russian national identity and thereby seeks to highlight the performative power of language. By placing considerable focus on the internal dimension of the Russian leadership’s conduct in the international arena, i.e. the consolidation of the national community in the event of war, the thesis contributes to an oft overlooked element of Russian foreign policy initiatives. Consequently, it seeks to challenge the tendency to explain Russian actions with regard to the war as a natural result of a neo-imperialistic identity – a tendency that fails to take into account how national identity can be constructed in its more immediate context. By making use of Rogers Brubaker's concept of nationalism as an event, the study discusses the increased force of nationalism during war and demonstrates how this was clearly the case during the 2008 war in Georgia. The analysis concentrates on three main identity visions within the official Russian discourse. Firstly, it examines how contemporary Russia was constructed as a great power, partly as a response to the claims that it was an imperialist state. Secondly, it discusses the role of certain historical concepts, i.e. the Cold War and the Soviet Union, within the discourse and elaborates upon the act of politicising history. Thirdly, the study analyses the Russian leadership’s protection narrative that emphasised the responsibility to protect Russian citizens and compatriots in South Ossetia and Abkhazia. It is demonstrated how these different identity visions were intertwined, resulting in a rather contradictory official discourse that speaks to many different audiences simultaneously, while foregrounding the first of the above-mentioned identity visions, namely of Russia as a great power.

Neste trabalho, duas técnicas de controle robusto (LQG/LTR e DML), aplicadas a um sistema elétrico de potência, são avaliadas através dos raios de estabilidade do sistema. As incertezas estruturadas do modelo nominal são consideradas nos dois controladores. Um conjunto de modelos é gerado considerando as combinações das incertezas paramétricas. Os valores singulares estruturados dos dois sistemas de controle são analisados. / In this work, two techniques of robust control (LQG/LTR) and LMI), applied to a power electric system, are available via stability radii of the system. The structured uncertainties of the nominal model are considered in both designs. A set of models is generated considering the combinations of the parametric uncertainties. The structured singular values of both systems are analysed.

Made available in DSpace on 2017-07-10T17:11:48Z (GMT). No. of bitstreams: 1 Dissertacao Willian Douglas F Mendonca.pdf: 2130607 bytes, checksum: ef5e681d6a8d26e8c6fe5324e3cf0c03 (MD5) Previous issue date: 2014-07-04 / In this Master's Dissertation is presented the development of a specialized algorithm for planning the expansion of pole networks of distribution systems. The technique used for solution is the Constructive Heuristics that has been used together with mathematical optimization models to solve the problem. However the presented algorithm does not employ a mathematical optimization model, in other words, a model compound of objective function and constraints. So, instead of working with variables, we seek to work with parameters, with the objective of providing greater speed to the research process, simplifying the search process for the final topology always keeping committed to finding a solution of good quality. Despite not having a guarantee that the solution is the global optimum, the solutions obtained by this type of algorithm solutions are almost always of excellent quality and can be used as a starting point for algorithms that use techniques or more complex mathematical models. To assist the Constructive Heuristic Algorithm in the search for the final topology is used a specialized routine for the calculation of AC power flow The methodology used by the subroutine for these calculations is based on the Backward Forward Sweep algorithm. / No presente trabalho é apresentado o desenvolvimento de um algoritmo especializado para o planejamento da expansão de redes aéreas de sistemas de distribuição. A técnica utilizada para solução é a Heurística Construtiva que tem sido utilizada em conjunto com modelos matemáticos de otimização para resolver o problema. No entanto o algoritmo apresentado não emprega um modelo matemático de otimização, em outras palavras, um modelo composto de função objetivo e restrições. Assim, em vez de trabalhar com variáveis, procura-se trabalhar com parâmetros, com o objetivo de proporcionar uma maior velocidade ao processo de pesquisa, simplificando o processo de busca para a topologia final sempre buscando manter o compromisso de encontrar uma solução de boa qualidade. Apesar de não ter a garantia de que a solução seja a ótima global, as soluções obtidas por este tipo de algoritmo são quase sempre soluções de excelente qualidade e podem ser usadas como ponto de partida para os algoritmos que usam técnicas ou modelos matemáticos mais complexos. Para auxiliar o Algoritmo Heurístico Construtivo na busca para a topologia final é usada uma rotina especializada para o cálculo do fluxo de potência CA. A metodologia utilizada pela subrotina para estes cálculos está baseada no algoritmo de varredura Backward Forward Sweep.

Neste trabalho, duas técnicas de controle robusto (LQG/LTR e DML), aplicadas a um sistema elétrico de potência, são avaliadas através dos raios de estabilidade do sistema. As incertezas estruturadas do modelo nominal são consideradas nos dois controladores. Um conjunto de modelos é gerado considerando as combinações das incertezas paramétricas. Os valores singulares estruturados dos dois sistemas de controle são analisados. / In this work, two techniques of robust control (LQG/LTR) and LMI), applied to a power electric system, are available via stability radii of the system. The structured uncertainties of the nominal model are considered in both designs. A set of models is generated considering the combinations of the parametric uncertainties. The structured singular values of both systems are analysed.

The conventional way of cryptanalysis is based on the cryptographic algorithms weak points examine. The attack model of conventional cryptanalysis covers mathematical description of the cryptographic algorithm used. This model is not with the relation to the physical model implementation and the real environment. Cryptographic algorithms currently used in the combination with strong cipher keys are almost unbreakable and the conventional cryptanalysis is ineffective. The new way of cryptanalysis employs the side channels. The model of cryptanalysis using side channels is enhanced with physical revelation of module performing the cryptographic operations. This dissertation thesis deals with cryptographic module description and studies influence of side channels to the security of this module.

The following dissertation studies the question how cyber security has become a national security agenda and discusses implications of the observed processes to current international security status quo. I divided the research into three parts. The first part embodies theoretical and methodological approach. The second part studies three distinct discourses related to cyber security, the techno-geek discourse, the crime-espionage discourse and the nation-defense discourse using the method of Michel Foucault about archaeology of knowledge. The third part then draws on these three discourses and discusses implications through lens of several theoretical perspectives. Namely through concepts taken from science and technology studies, from actor network theory and network assemblages. The critical point of the research is a distinct reading of these discourses. While techno-geeks are understood as a source of semiosis, hackers' capability and crypto-anarchy ideology influenced by cyberpunk subculture, the cyber-crime and espionage discourse is read as a source of evidence of the hackers' capability. The inspiration in popular subculture is combined with current efforts in development of liberating technologies against oppression by authorities, oppression recognized by the eyes of the crypto-anarchist...

In the operation, planning and design of the transmission system it is of greatest concern to quantify the reliability security margin to unwanted conditions. The deterministic N-1 criterion has traditionally provided this security margin to reduce the consequences of severe conditions such as widespread blackouts. However, a deterministic criterion does not include the likelihood of different outage events. Moreover, experience from blackouts shows, e.g. in Sweden-Denmark September 2003, that the outages were not captured by the N-1 criterion. The question addressed in this thesis is how this system security margin can be quantified with probabilistic methods. A quantitative measure provides one valuable input to the decision-making process of selecting e.g. system expansions alternatives and maintenance actions in the planning and design phases. It is also beneficial for the operators in the control room to assess the associated security margin of existing and future network conditions. This thesis presents a method that assesses each component's risk to an insufficient transfer capability in the transmission system. This shows on each component's importance to the system security margin. It provides a systematic analysis and ranking of outage events' risk of overloading critical transfer sections (CTS) in the system. The severity of each critical event is quantified in a risk index based on the likelihood of the event and the consequence of the section's transmission capacity. This enables a comparison of the risk of a frequent outage event with small CTS consequences, with a rare event with large consequences. The developed approach has been applied for the generally known Roy Billinton Test System (RBTS). The result shows that the ranking of the components is highly dependent on the substation modelling and the studied system load level. With the restriction of only evaluating the risks to the transfer capability in a few CTSs, the method provides a quantitative ranking of the potential risks to the system security margin at different load levels. Consequently, the developed reliability based approach provides information which could improve the deterministic criterion for transmission system planning.