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Cognitive radio (CR) is seen as one of the enabling technologies for realizing a new regulatory spectrum management paradigm, viz. opportunistic spectrum sharing (OSS). In the OSS paradigm, unlicensed users (a.k.a. secondary users) opportunistically operate in fallow licensed spectrum on a non-interference basis to licensed users (a.k.a. incumbent or primary users). Incumbent users have absolute priority in licensed bands, and secondary users must vacate the channel where incumbent user signals are detected. A CR network is composed of secondary users equipped with CRs and it can coexist with incumbent users in licensed bands under the OSS paradigm. The coexistence between incumbent users and secondary users is referred to as incumbent coexistence, and the coexistence between CR networks of the same type is referred to as self-coexistence. In this dissertation, we address three coexistence-related problems at the medium access control (MAC) layer in CR networks: (1) the rendezvous (control channel) establishment problem, (2) the channel assignment problem in an ad hoc CR network, and (3) the spectrum sharing problem between infrastructure-based CR networks, i.e., the 802.22 wireless regional area networks (WRANs). Existing MAC layer protocols in conventional wireless networks fail to adequately address the key issues concerning incumbent and self coexistence that emerge in CR networks. To solve the rendezvous establishment problem, we present a systematic approach, based on quorum systems, for designing channel hopping protocols that ensure a pair of CRs to "rendezvous" within an upper-bounded time over a common channel that is free of incumbent user signals. In a single radio interface, ad hoc CR network, we propose a distributed channel assignment scheme that assigns channels at the granularity of "segments" for minimizing the channel switching overhead. By taking into account the coexistence requirements, we propose an inter-network spectrum sharing protocol that enables the sharing of vacant TV white space among coexisting WRANs. Our analytical and simulation results show that these proposed schemes can effectively address the aforementioned MAC layer coexistence problems in CR networks. / Ph. D.

Opportunistic Routing (OR) can be used as an alternative to the legacy routing (LR) protocols in networks with a broadcast lossy channel and possibility of overhearing the signal. The power line medium creates such an environment. OR can better exploit the channel than LR because it allows the cooperation of all nodes that receive any data. With LR, only a chain of nodes is selected for communication. Other nodes drop the received information. We investigate OR for the one-source one-destination scenario with one traffic flow. First, we evaluate the upper bound on the achievable data rate and advocate the decentralized algorithm for its calculation. This knowledge is used in the design of Basic Routing Rules (BRR). They use the link quality metric that equals the upper bound on the achievable data rate between the given node and the destination. We call it the node priority. It considers the possibility of multi-path communication and the packet loss correlation. BRR allows achieving the optimal data rate pertaining certain theoretical assumptions. The Extended BRR (BRR-E) are free of them. The major difference between BRR and BRR-E lies in the usage of Network Coding (NC) for prognosis of the feedback. In this way, the protocol overhead can be severely reduced. We also study Automatic Repeat-reQuest (ARQ) mechanism that is applicable with OR. It differs to ARQ with LR in that each sender has several sinks and none of the sinks except destination require the full recovery of the original message. Using BRR-E, ARQ and other services like network initialization and link state control, we design the Advanced Network Coding based Opportunistic Routing protocol (ANChOR). With the analytic and simulation results we demonstrate the near optimum performance of ANChOR. For the triangular topology, the achievable data rate is just 2% away from the theoretical maximum and it is up to 90% higher than it is possible to achieve with LR. Using the G.hn standard, we also show the full protocol stack simulation results (including IP/UDP and realistic channel model). In this simulation we revealed that the gain of OR to LR can be even more increased by reducing the head-of-the-line problem in ARQ. Even considering the ANChOR overhead through additional headers and feedbacks, it outperforms the original G.hn setup in data rate up to 40% and in latency up to 60%.:1 Introduction 2 1.1 Intra-flow Network Coding 6 1.2 Random Linear Network Coding (RLNC) 7 2 Performance Limits of Routing Protocols in PowerLine Communications (PLC) 13 2.1 System model 14 2.2 Channel model 14 2.3 Upper bound on the achievable data rate 16 2.4 Achieving the upper bound data rate 17 2.5 Potential gain of Opportunistic Routing Protocol (ORP) over Common Single-path Routing Protocol (CSPR) 19 2.6 Evaluation of ORP potential 19 3 Opportunistic Routing: Realizations and Challenges 24 3.1 Vertex priority and cooperation group 26 3.2 Transmission policy in idealized network 34 3.2.1 Basic Routing Rules (BRR) 36 3.3 Transmission policy in real network 40 3.3.1 Purpose of Network Coding (NC) in ORP 41 3.3.2 Extended Basic Routing Rules (BRR) (BRR-E) 43 3.4 Automatic ReQuest reply (ARQ) 50 3.4.1 Retransmission request message contents 51 3.4.2 Retransmission Request (RR) origination and forwarding 66 3.4.3 Retransmission response 67 3.5 Congestion control 68 3.5.1 Congestion control in our work 70 3.6 Network initialization 74 3.7 Formation of the cooperation groups (coalitions) 76 3.8 Advanced Network Coding based Opportunistic Routing protocol (ANChOR) header 77 3.9 Communication of protocol information 77 3.10 ANChOR simulation . .79 3.10.1 ANChOR information in real time .80 3.10.2 Selection of the coding rate 87 3.10.3 Routing Protocol Information (RPI) broadcasting frequency 89 3.10.4 RR contents 91 3.10.5 Selection of RR forwarder 92 3.10.6 ANChOR stability 92 3.11 Summary 95 4 ANChOR in the Gigabit Home Network (G.hn) Protocol 97 4.1 Compatibility with the PLC protocol stack 99 4.2 Channel and noise model 101 4.2.1 In-home scenario 102 4.2.2 Access network scenario 102 4.3 Physical layer (PHY) layer implementation 102 4.3.1 Bit Allocation Algorithm (BAA) 103 4.4 Multiple Access Control layer (MAC) layer 109 4.5 Logical Link Control layer (LLC) layer 111 4.5.1 Reference Automatic Repeat reQuest (ARQ) 111 4.5.2 Hybrid Automatic Repeat reQuest (HARQ) in ANChOR 114 4.5.3 Modeling Protocol Data Unit (PDU) erasures on LLC 116 4.6 Summary 117 5 Study of G.hn with ANChOR 119 5.1 ARQ analysis 119 5.2 Medium and PHY requirements for “good” cooperation 125 5.3 Access network scenario 128 5.4 In-home scenario 135 5.4.1 Modeling packet erasures 136 5.4.2 Linear Dependence Ratio (LDR) 139 5.4.3 Worst case scenario 143 5.4.4 Analysis of in-home topologies 145 6 Conclusions . . . . . . . . . . . . . . . 154 A Proof of the neccessity of the exclusion rule 160 B Gain of ORPs to CSRPs 163 C Broadcasting rule 165 D Proof of optimality of BRR for triangular topology 167 E Reducing the retransmission probability 168 F Calculation of Expected Average number of transmissions (EAX) for topologies with bi-directional links 170 G Feedback overhead of full coding matrices 174 H Block diagram of G.hn physical layer in ns-3 model 175 I PER to BER mapping 177

The objective of this dissertation is to better understand the impact of the range extension and interference effects of opportunistic large arrays (OLAs), in the context of cooperative routing in multi-hop ad hoc networks. OLAs are a type of concurrent cooperative transmission (CCT), in which the number and location of nodes that will participate in a particular CCT cannot be known a priori. The motivation of this research is that the previous CCT research simplifies or neglects significant issues that impact the CCT-based network performance. Therefore, to develop and design more efficient and realistic OLA-based protocols, we clarify and examine through experimentation and analysis the simplified or neglected characteristics of CCT, which should be considered in the network-level system design. The main contributions of this research are (i) intra-flow interference analysis and throughput optimization in both disk- and strip-shaped networks, for multi-packet OLA transmission, (ii) CCT link modeling focusing on path-loss disparity and link asymmetry, (iii) demonstration of CCT range-extension and OLA-based routing using a software-defined radio (SDR) test-bed, (iv) a new OLA-based routing protocol with practical error control algorithm. In the throughput optimization in presence of the intra-channel interference, we analyze the feasibility condition of spatially pipelined OLA transmissions using the same channel and present numerical results with various system parameters. In the CCT link model, we provide the impact of path-loss disparity that are inherent in a virtual multiple-input-single-output (VMISO) link and propose an approximate model to calculate outage rates in high signal-to-noise-ratio (SNR) regime. Moreover, we present why link asymmetry is relatively more severe in CCT compared to single-input-single-output (SISO) links. The experimental studies show actual measurement values of the CCT range extension and realistic performance evaluation of OLA-based routing. Lastly, OLA with primary route set-up (OLA-PRISE) is proposed with a practical route recovery technique.

Bakgrund: Utbredningen av dolda indexfonder har visat sig starkt relaterat till ett lands regelverk och avsaknad av konkurrens på fondmarknaden i form av uttalade indexfonder (Cremers et al. 2013). Då Sverige är ett av de länder som placerar sig i topp vad gäller utbredning av dolda indexfonder (Cremerset al. 2013), är detta remarkabelt med tanke på att Sverige har ett effektivt och välfungerande juridisktsystem (Heritage Foundation 2016). Detta har föranlett oss att undersöka förekomsten av doldaindexfonder i Sverige, samt identifiera och analysera möjliga orsaker till val av aktivitetsgrad utifrånsåväl yttre som inre faktorer. Syfte: Uppsatsen syfte är att med anledning av att det framkommit att dolda indexfonder är vanligt förekommande på den svenska fondmarknaden, undersöka aktivitetsgraden i svenska aktiefonder, samt identifiera och analysera möjliga orsaker till val av aktivitetsgrad. Genomförande: Studien genomförs med ett kvantitativt angreppssätt för att möjliggöra ett statistiskt säkerställt resultat kring aktiviteten på den svenska fondmarknaden. Aktivitetsgraden på den svenskafondmarknaden mäts, genom active share, för att sedan ligga till grund för tester angående hur olika karaktärsdrag påverkar en fonds aktivitet. Avslutningsvis undersöks hur studiens resultat kan kopplas till de spelregler som gäller på den svenska fondmarknaden. Slutsats: Studiens resultat visar på att drygt hälften, 52 %, av de påstått aktivt förvaltade fonderna under mätperioden 2005-2015, i själva verket är att betrakta som dolda indexfonder. Resultatet visar dock också på att det under mätperioden skett en kraftig förbättring av fonders aktivitetsgrad, samt att fler fonder förvaltas aktivt på den svenska marknaden. Fondens inriktning, såväl som om fonden är förvaltad av en storbank, har en signifikant negativ påverkan på fondens aktivitet. Det kan till stor del förklaras av att rådande regelverk och den svenska aktiemarknadens storlek, indirekt uppmuntrar fonder till en lägre aktivitetsgrad. / Background: The existence of closet index funds has been shown highly correlated to regulations andcompetition of explicit index funds on a market (Cremers et al. 2013). Despite its strong regulations andpresence of explicit index funds, studies have shown that Sweden has a high amount of closet indexfunds. This fact has led to our interest in examining the presence of closet index funds on the Swedish market, and to try to identify and analyze potential characteristics of a fund that affect its choice ofactivity rate. Aim: The aim of the study is, by reason of the proven high presence of closet index funds on the Swedish market, to examine the activity rate within the funds, and to identify and analyze potential characteristics that affects it. Completion: The study is conducted through quantitative research. The activity rate of the fund marketis measured through active share and then analyzed for how different characteristics influence the funds activity rate. Eventually the results of the study are being analyzed for if and how they are concatenated to the rules of the Swedish fund market. Conclusion: The result of the study shows that 52 % of the predicated actively managed funds were actually proven to be closet index funds. However, the result also shows that the degree of active share has generally risen, and that more funds are being actively managed in Sweden. The alignment of the fund, as well as if the fund is managed by a major bank, are proven to have a significant negative impactof the activity of the fund. This negative relationship is largely linked to the regulations as well as the size of the Swedish stock market, which creates incentives for low activity of the funds.

The aim of my diploma thesis is to analyse the posibility of existence of a political cycle in the selected european countries (Ireland and Germany). The work describes the various theories of the political cycle. I try to prove the existence of political cycle by analysing of political and economical data (inflation rate and unemployment rate). The work examines two main theories of the political cycle. These two theories are: opportunistic political cycle theory, which suppose that the main motive of the politicians are being re-elected in the next election. And ideological political cycle theory assume that politicians behavior accord to their parties ideological orientation.

Por serem as manifestações pulmonares de etiologia infecciosas muito freqüentes e potencialmente graves nas crianças com aids, o diagnóstico deve ser precoce para uma rápida e efetiva intervenção terapêutica. A proteína C reativa (PCR), um dos marcadores das provas de fase aguda, tem sido usada na prática clínica como um recurso diagnóstico na diferenciação entre patologias sistêmicas de etiologia viral e bacteriana, bem como na monitorização da eficácia da terapêutica antimicrobiana frente a uma infecção. Apesar da proteína C reativa ser um exame inespecífico e poder estar aumentada em diferentes situações clínicas (infecções sistêmicas, doenças inflamatórias e neoplásicas, isquemias, queimaduras), a infecção bacteriana é a causa mais freqüente para o seu aumento. A PCR eleva-se rapidamente após a injúria tecidual, atingindo valores 10 a 1000 vezes superiores a seu nível basal: em virtude de sua curta meia vida, retorna em pouco tempo aos valores prévios após o fim da agressão. Com o objetivo de encontrar um método laboratorial auxiliar para as infecções pulmonares nas crianças com infecção pelo HIV foi estudada a proteína C reativa, pela técnica de nefelometria, em dois momentos distintos: na ausência de quadro infeccioso concomitante (grupo 1) e na vigência de pneumonia aguda (grupo 2). O grupo 1 envolveu o estudo de 66 crianças com infecção pelo HIV, resultando em 84 amostras de PCR coletadas na ausência de quadro infeccioso concomitante.No grupo 2 foram analisadas 6 crianças com infecção pelo HIV com 9 episódios de pneumonia aguda. As crianças com infecção pelo HIV foram classificadas de acordo com as categorias clínicas e imunológicas da classificação do CDC para infecção pelo HIV em crianças. Dentre as 66 crianças incluídas no grupo 1, 6 pertenciam à categoria N, 11 à categoria A, 27 à categoria B e 22 à categoria C. Das 84 amostras de PCR coletadas no grupo 1, 76 (90,48%) encontravam-se abaixo de 5 mg/l, 7 amostras entre 5 a 20 mg /l e, apenas 1 amostra entre 20 a 40 mg/l (1,15%). No grupo 2, todas as crianças eram pertencentes às categorias B3 (1/6) ou C3 (5/6), refletindo um estágio mais avançado da doença. Das 9 amostras de PCR, 6 apresentavam valores maiores que 40 mg/l, 1 entre 20 e 40 mg/l e as 2 amostras restantes, entre 5 e 20 mg/l. Os dados sugerem portanto que a infecção pelo HIV por si só não é acompanhada de aumento da PCR, bem como não existe relação com a classificação imunológica em que o paciente se encontre. Pacientes com infecção pelo HIV na vigência de pneumonia aguda apresentam níveis aumentados de PCR. Neste estudo, o ponto de corte que diferenciou os grupos 1 e 2 foi PCR = 28,9 mg/l com sensibilidade de 77,8% e especificidade de 100% (IC 95%) / As pulmonary infection is a common and potentially serious condition in HIV-infected children, effectiveness of treatment of this kind of affection depends to a large extent on the promptness of accurate diagnosis. The C-Reactive Protein (CRP), a reasonably well-established acute phase marker, has long been used to differentiate bacterial from viral infections. Despite its lack of specifity, that is, the fact that other conditions like inflammatory diseases, neoplasms, ischemia and burns may also increase CRP levels, Bacterial infections are the most frequent cause of increased CRP found in daily clinical practice. Shortly after any tissular injury, CRP increases considerably, reaching up to 10-1000 times its previous levels. Due to its short half-life, its decrease after the end of the affection is quick as well. This study aimed at evaluating the CRP (assessed by nephelometry) as an auxiliary tool to diagnose pulmonary infection in HIV-infected children. Two groups of patients were considered in this study: group 1 was constituted by 66 HIV-infected children with no clinical signs of concomitant infection (amounting to 84 CRP samples) and group 2 was constituted by 6 HIV-infected children with pneumonia (amounting to 9 CRP samples). All the subjects were assigned to categories according to the pediatric HIV classification system (CDC, 1994). Among the 66 children from group 1, 6 were assigned to categories N, 11 to A, 27 to B and 22 to C. Regarding the levels of CRP in group 1 it was found: 76 samples (90.48%) < 5 mg/l, 7 (8.33%) in the range between 5 and 20 mg/l and 1 sample between 20 and 40 mg/l. In the group 2, all the children were assigned either to category B3 (1/6) or C3 (5/6) and the CRP level distribution was the following: 6 (6/9) > 40 mg/l, 1 (1/6) between 20 and 40 mg/l and 2 (2/6) between 5 and 20 mg/l. These results suggest that 1.HIV infection by itself does not increase the levels of CRP, regardless the immunologic classification of the patient; 2.HIV-infected children with pneumonia present increased levels of CRP 3.In this study, the cut-off point to differentiate groups 1 and 2 was 28,9 mg/l, with sensitivity of 77,8% and specificity of 100% (p < 0.05)

Made available in DSpace on 2016-01-26T12:51:37Z (GMT). No. of bitstreams: 1 arlindoschiesarijunior_dissert.pdf: 1015118 bytes, checksum: a4f2b40a6b49a66d95541b775795efb0 (MD5) Previous issue date: 2010-11-25 / Hereby we present the epidemiological and clinical profile of the HIV-infected group before and during the HAART era from a tertiary care hospital catering to a large population from the Southeastern Brazilian region. A retrospective, cross-sectional and descriptive study was carried out, which involved the analysis of the medical records of patients diagnosed with HIV-1/AIDS admitted to Hospital Escola Emílio Carlos, located in the municipality of Catanduva, State of São Paulo, Brazil. In both pre-HAART and HAART periods, HIV-1 infection was more prevalent in men. Heterosexuality and secondary education were the risk facts for acquisition of the disease in the HAART period. Statistically significant association was only observed for co-infection with HIV-1/Hepatitis C in the pre-HAART era and the number of patients with opportunistic illness (OI) was lower in the HAART period. Among all these OI it is worth mentioning pulmonary pneumocystosis, since despite being frequent in the two periods, its occurrence was considerably greater in the pre-HAART era. Concerning the distribution of OI according to the HIV-1 viral load and serial count of T CD4+ lymphocytes, a significant association was observed. The association between the number of deaths by OI and the survival rate of less than 1 year in the HAART period was significant. The clinical and epidemiological picture of a specialized HIV-1/AIDS Center in a municipality in the southeastern region of Brazil is consistent with the current epidemiology of AIDS in the country. In conclusion, our results indicate that the OI are still important causes of morbi-mortality among HIV-1/AIDS infected patients in the municipality of Catanduva, particularly pulmonary pneumocystosis, tuberculosis and cryptococcal meningoencephalitis. We are aware that retrospective studies such as ours, which involve the review of patients medical records, may present some limitations arising from the scarcity or even absence of information. / Nós apresentamos o perfil clínico e epidemiológico de indivíduos portadores do HIV-1 antes e durante a era da terapia antirretroviral altamente ativa (HAART) de um hospital terciário que atende uma grande população da região Sudeste do Brasil. Estudo retrospectivo, transversal e descritivo que envolveu a análise de prontuários dos pacientes diagnosticados com HIV-1/AIDS atendidos no Hospital Escola Emílio Carlos, localizado no município de Catanduva, Estado de São Paulo, Brasil. Em ambos os períodos pré-HAART e HAART, a infecção por HIV-1 foi mais prevalente em homens. Heterossexualidade e nível de escolaridade do ensino médio foram os fatores de risco para aquisição da doença no período HAART. Associação estatisticamente significante foi observada somente para a coinfecção HIV-1/Hepatite C na era pré-HAART e o número de pacientes com infecções oportunistas (IO) foi menor no período HAART. Entre todas estas IO vale à pena mencionar a pneumocistose pulmonar, pois apesar de ser freqüente nos dois períodos, sua ocorrência foi significativamente maior na era pré-HAART. Quanto à distribuição de IO de acordo com a carga viral do HIV-1 e contagem de linfócitos T CD4 +, uma associação significativa foi observada. A associação entre o número de mortes por IO e a taxa de sobrevivência de menos de um ano na era HAART foi significativa. O quadro clínico e epidemiológico de um centro de atendimento especializado em HIV-1/AIDS em um município na região sudeste do Brasil é compatível com a epidemiologia atual da AIDS no país. Em conclusão, nossos resultados indicam que as IO ainda são importantes causas de morbi-mortalidade entre os pacientes infectados por HIV-1/AIDS no município de Catanduva, particularmente a pneumocistose pulmonar, a tuberculose e a meningoencefalite criptococócica. Estamos cientes de que estudos retrospectivos como o nosso, que envolvem a revisão de prontuários médicos, podem apresentar algumas limitações decorrentes da escassez, ou mesmo da ausência de informações.

Submitted by Fabricia Fialho Reginato (fabriciar) on 2015-08-05T01:23:08Z No. of bitstreams: 1 EduardoCalvilho.pdf: 1038907 bytes, checksum: 42aa99d4bd73dde5b305062373fa2c0e (MD5) / Made available in DSpace on 2015-08-05T01:23:08Z (GMT). No. of bitstreams: 1 EduardoCalvilho.pdf: 1038907 bytes, checksum: 42aa99d4bd73dde5b305062373fa2c0e (MD5) Previous issue date: 2012-05-24 / Nenhuma / Os países em desenvolvimento têm se mostrado como um ótimo investimento para empresas multinacionais que desejam ampliar sua área de atuação. A limitação de certos recursos tecnológicos nesses países somada à dificuldade de penetração de organizações estrangeiras faz com que as Alianças Estratégicas Internacionais (AEI) despontem como boa opção para as empresas de ambas nacionalidades. Segundo o estudo da Booz & Company Consultoria o cenário decorrente da exploração do Pré-sal demandará por tecnologia de ponta e investimentos da ordem de US$ 500 bilhões no setor de Exploração e Produção (E&P) de Petróleo. Entender então que pontos deveriam ser observados antes de criar e ao conduzir as Alianças Estratégicas (AE) demandadas por esse novo ambiente trará vantagens competitivas e maior probabilidade de sucesso às organizações. A literatura aponta a divergência cultural como um item importante a ser considerado no processo de formação de alianças. Há uma relação direta entre a cultura e as estrutura de governança das organizações, a qual define princípios e comportamentos que nortearão a gestão da aliança. (LANGFIELD-SMITH, 2008). Estudos desenvolvidos por Ness e Haugland (2005), Poppo e Zenger (2002) e Roath et al. (2002) apontaram como sendo duas as dimensões de estrutura de governança das organizações: foco no contrato (transacional) e foco no relacionamento. Para investigar como as diferentes culturas organizacionais (relacional e transacional) interagem em AEs ou AEIs foram investigadas seis alianças que foram constituídas para prestação de serviços especializados para uma empresa do governo. O autor identificou que todas as alianças operaram em ambientes predominantemente transacionais. As divergências de culturas entre as empresas nacionais e internacionais não afetou o desempenho das alianças. Entretanto, o desequilíbrio de forças provocado pela empresa do governo resultou na elevação dos custos para alianças no primeiro momento. Para recuperação dos resultados as alianças se valeram de comportamentos oportunistas aproveitando indefinições nos contratos de serviços, aumentando os custos ex post para o cliente em um segundo momento. Por fim, a análise dos achados permitiu a identificação de três formas como se estabelece a estrutura de governança das alianças, definido pela cultura, pela situação ou pela estratégia. / The developing countries are presenting themselves as a good investment option to international companies which are aiming for expanding their busines area. The technological limitation of those countries added to the difficulties that the foreign companies have to access the local market make the International Strategic Alliances (ISA) become as a good option for companies of both nationalities. According to Booz & Company Consulting study, the Pre-salt exploration scenario will demand not only for high technology, but also for financial investments around US$ 500 billion on the Exploration and Production (E&P) sector. So that, understanding which points should be observed after the Strategic Alliances (SA) creation and when running an alliance will result in competitive advantage and in an additional chances of the organizations success. The literature points out to cultural divergence as an important issue to be considered on the alliances process formation. There is a close relation between the organization culture and its Governance structure and this defines principles and behaviors which guide the alliance management. (LANGFIELD-SMITH, 2008). The studies of Ness and Haugland (2005), Poppo and Zenger (2002) and Roath et al. (2002) indicated two governance structure dimensions, contract oriented (transactional) and relations oriented. To investigate how different organizational cultures (contractual or relational) interact in SA or in ISA were researched six alliances. These SA were established to perform specialized services to a governmental company. The author found out that all alliances had run on scenarios predominantly transactional. The cultural divergences between national and international companies didn’t seem to affect the alliances performance. The unbalance of power situation created by the governmental company resulted in costs raise to the alliances at the first time. To recover the revenue the alliances had to use opportunistic behaviors, by means of taking advantage of lack of details of the service contract, raising the ex post costs to the customer afterwards. In the end, the findings analysis led the author to identify three different ways how the alliances’ governance structure is established, defined by culture, by the situation or by the strategy.